39results about How to "Flexible and adjustable frequency" patented technology

The invention provides a constant current type hybrid environmental protection charging device, which belongs to the electronic technology field and comprises a charging unit, a process and end indicating unit, an end executing unit, an end switching switch, a timing ending unit, a trickle resistor and a load unit. As the two transistors of the charging unit are connected in a constant current manner and are connected in parallel through a special way to form or-gate output, the charging process is one charged by constant current. Further, only one transistor works while the other transistor stands by. When the working transistor is damaged, the other one replaces. According to the invention, there are two ending manners available with one being that when the end voltage of a charger cell rises, the end executing is initiated after sampling to form the closing of the charging unit and the other being that when the counting of the end counting unit is completed, the end executing unit is initiated to form the closing of the charging unit. The end switching switch forms the selection. When the charging unit is closed, the trickle resistor provides trickle current to the charged cell for its maintenance.

The invention discloses an automatic frequency calibration system of an electrically tuned duplexer, and relates to the field of microwave communication. The system comprises a frequency calibration unit, a first switch, a second switch, a generating tuned filter, a receiving tuned filter, a circulator, a radio frequency self-circulator, a low-noise amplifier and the like, wherein the frequency calibration unit is used for carrying out variable frequency amplifying and filtering on received signals, sequentially sampling, comparing, judging and counting filtered signals, and outputting a specified generating frequency to the generating tuned filter or outputting a specified receiving frequency to the receiving tuned filter after a preset threshold is reached. Through cooperation of the frequency calibration unit and the switches, the electrically tuned duplexer achieves automatic frequency calibration and has the characteristics of high intelligent and automatic degrees; the work frequency can be automatically changed and calibrated within a wide frequency range through electromechanical combination and software-hardware combination; the tuning speed is high; the accuracy and the stability of the work frequency of the duplexer are kept in high and low temperature environments; and the frequency calibration system is the automatic frequency calibration system of the electrically tuned duplexer with high universality and high integration.

The invention relates to chiral manganese oxide nanoparticles as well as a preparation method and application thereof, and relates to the technical field of material chemistry. According to the chiral manganese oxide nano particle, a manganese precursor, tartaric acid and a reducing agent react under the alkaline condition to obtain the chiral manganese oxide nano particle; and the tartaric acid is L-tartaric acid or D-tartaric acid. The chiral manganese oxide nanoparticles have chiral optical activity at 300-900nm, the preparation method is simple, the application is wide, and the prepared manganese oxide nanoparticles have important significance in promoting the development of the fields of optics, life science, medicine and the like.

The invention discloses a constant current charging-discharging pulse charger, and belongs to the technical field of electronics. The constant current charging-discharging pulse charger is composed ofa process indicting unit, a voice prompt unit, an N-type charging unit, an N-type discharging unit, an interface unit, a pulse unit, a double-selection termination unit, a load unit, and a trickle resistor. The N-type charging unit, the N-type discharging unit and the pulse unit, and the interface unit form a pulse charging form that is capable of charging and discharging and having a charging time longer than the discharging time. A constant current triode of the N-type charging unit is connected in the form of constant current, therefore forming constant current charging. The constant current charging-discharging pulse charger has termination after the full charging of the battery and termination after the end of the timing countdown which can easily switch. After the end of charging ordischarging, the trickle resistor provides required trickle current to a to-be-charged battery, the inverter in each unit is formed of a gate circuit that has mutation input and output. The constantcurrent charging-discharging pulse charger has strong loading capability. After the implementation, the constant current charging-discharging pulse charger can flexibly adjust the charging and discharging time of the to-be-charged power supply and is suitable to to-be-charged batteries of different types.

The invention discloses a hybrid type dual-finishing type floating charging apparatus, and belongs to the technical field of electronics. The hybrid type dual-finishing type floating charging apparatus comprises a constant current source, a silicon controlled rectifier charging unit, a discharging unit, an interface unit, a pulse unit, a dual-selection finishing unit, a voice control unit, a process indicating unit, a load unit and a trickle resistor; the constant current source provides a constant current for the silicon controlled rectifier charging unit, so that constant current charging can be performed; the pulse unit controls the interface unit and the discharging unit, and the interface unit controls the silicon controlled rectifier charging unit, so that a pulse form is formed; inone pulse period, charging and discharging coexist; by virtue of pulse, duty ratio adjustment is also performed, so that the charging time is longer than the discharging unit; in the measures, two finishing ways of finishing after the battery is fully charged and finishing when timing is completed are included and can be switched flexibly and conveniently; sound prompting is given out in finishing; and the trickle resistor provides the required trickle for the charged battery to realize scientific charging and maximum discharging for the battery, thereby maximizing the service lives and capacities of the charger and the charged battery.

The invention relates to a low-carbon environmental protection charging circuit scheme, and belongs to an electronic technology. The low-carbon environmental protection charging circuit scheme is composed of a charging portion, a starting and ending unit, a pulse generating unit, an interface unit, a logic and charge display unit, a discharging portion and a load unit, and is characterized in that the charging portion and the discharging portion perform a scientific charging mode of charging while discharging on a charged battery when a power supply is turned on, the discharging portion is turned off when the charging portion is turned on, the discharging portion is turned on when the charging portion is turned off, a pulse charging mode in which the charging process is longer than the discharging process is formed, both the charging portion and the discharging portion are provided with a dormant circuit and an operating circuit, the dormant circuit is on standby when the operating circuit is in operation, and the dormant circuit is put into operation automatically when the operating circuit is damaged, so that utilization of a charger is guaranteed, the charging portion and the discharging portion are turned off when the charged battery is fully charged, and trickle current in the charging portion provides required maintenance trickle current for the charged battery, thereby realizing scientific pulse charging, and realizing environmental protection of the society.

The invention provides a double-N type pulse environment-friendly charging device, and belongs to the technical field of electronics. The device is formed by a charging portion, a pulse generation portion, an end-start adjustable unit, a charging display circuit, an end-start control portion, a discharge portion, and a load unit, and oscillation of the pulse generation unit is a control circuit for forming pulse charging of the charging portion and the discharge portion; when the charging of the charging portion is switched on, the discharge portion is switched off; when the charging portion is switched off, the discharge portion is switched on so that a scientific pulse charging mode in which the charging time is longer than the discharge time is formed; and when a battery is fully charged, the charge portion and the discharge portion are switched off, and a trickle resistor in the charging portion provides maintenance current to a charged power supply. According to the device, the charging portion and the discharge portion both have the standby automatic switching function, the circuit reliability is guaranteed, pulse charging while charging and discharge is formed, the pulse generation unit can flexibly adjust the frequency and the time of duty ratio, convenience and reliability are achieved, and the device is applicable to the charged batteries with different capacities and is a convenient environment-friendly charging device.

The invention relates to an applicable type cell float charger and belongs to the electronic technology field. The applicable type cell float charger comprises a constant current charging unit, a discharging unit, an interface unit, a pulse unit, a selection unit, a counting unit, a voltage limiting starting unit, a load unit, a process indicator unit, an ending unit and a trickle resistor, wherein the constant current charging unit, the discharging unit, the pulse unit and the interface unit commonly form a charging / discharging pulse charging mode, the charging time is longer than the discharging time, a triode of the constant current charging unit is in a constant current mode, so constant current charging is realized. The float charger is advantaged in that an ending mode after fully charging of a cell and an ending mode after timed counting in place are employed and are two flexible conversion modes, the needed trickle current is provided by the trickle resistor to the charged cellafter charging ending, a discharging cut-off switch is arranged in the discharging unit, charging flexibility is realized, after enforcement, scientific and maximum charging of the charging cell is realized, and service life and the capacity of the charger and the charged cell are improved to the maximum degree.

The invention provides a pulse timing low-carbon and environment-friendly charging device, and belongs to the technology of electronics. The pulse timing low-carbon and environment-friendly charging device is composed of a charging display unit, an interface unit, a charging unit, a pulse generation unit, a discharging unit, a sampling adjustable unit, an end control unit and a load unit. After the power is on, all the units start to work, wherein the charging unit and the discharging unit perform the process on a charged battery in which charging is greater than discharging. When the charging unit is powered on for charging, the discharging unit is powered off; and when the charging unit is off, the discharging unit is powered on for discharging so as to form the mode of pulse charging until completion of charging. The cutting switch in the discharging unit can also be used for cut-off so as to increase the flexible selectivity. After the charged battery is fully charged, the charging unit and the discharging unit are powered off, and then the trickle resistor in the charging unit provides trickle current required for maintenance of the charged battery. After application of the device, all the units are scientifically connected, and comprehensive utilization can be realized, the line circuit is concise and the reliability is high so that the device is quite suitable for miniature enterprise production.

The invention provides an ultra-high-order harmonic compensation control method, which is applied to an ultra-high-order harmonic compensation device, the device comprises an ultra-high-order harmonic source connected to a power grid, and the method comprises the following steps: S101, detecting ultra-high-order harmonics at a common connection point of the power grid, judging whether compensation is needed or not based on a detection result, if compensation is not needed, locking the ultra-high-order harmonic source, and if compensation is not needed, locking the ultra-high-order harmonic source; if compensation is needed, executing the next step; s102, determining a carrier angular frequency according to the detected ultra-high-order harmonics, and assigning initial values to a carrier phase, a direct current side voltage amplitude and a modulation ratio; s103, the carrier phase, the modulation ratio and the direct current side voltage amplitude are set until the carrier phase, the modulation ratio and the current side voltage amplitude which inhibit the ultra-high-order harmonic amplitude at the common connection point of the system side to the maximum degree are found; and S104, judging whether the ultra-high-order harmonic index at the common connection point meets the requirement or not, if so, enabling the ultra-high-order harmonic source to keep the operation parameters to continuously operate, and if not, returning to the step S103. According to the invention, compensation of specific-order ultra-high-order harmonics can be realized.

The invention discloses a voltage limiting ending type silicon controlled floating charger, and belongs to the field of electronic technique. The voltage limiting ending type silicon controlled floating charger consists of a trickle resistor, a creative silicon controlled charging unit, a creative silicon controlled discharging unit, an interface unit, a pulse unit, a voltage limiting ending unit,a load unit, a voice control unit and a process indicating unit; a charging and discharging coexisting pulse charging mode that the charging time is longer than the discharging time is formed by thecreative silicon controlled charging unit and the creative silicon controlled discharging unit together with the pulse unit and the interface unit; in the charging and discharging coexisting pulse charging mode, in one period of pulse, the creative silicon controlled discharging unit is turned off when the creative silicon controlled charging unit is turned on, the creative silicon controlled discharging unit is turned on when the creative silicon controlled charging unit is turned off, after a battery is full of electricity, the voltage limiting ending unit is turned on, the creative siliconcontrolled charging unit and the creative silicon controlled discharging unit are both turned off, voice reminding is emitted by the voice control unit, and trickle is provided for the charged batteryby the trickle resistor.

The invention relates to a floating charger capable of pulse charging, and belongs to the technical field of electronics. The floating charger comprises a process indication unit, a parallel discharging unit, a parallel charging unit, an interface unit, a pulse unit, a dual-selection ending unit, a load unit and a trickle resistor. A charging circuit difficult to damage is achieved by a few activepieces, the parallel charging unit, the parallel discharging unit, the interface unit and the pulse unit are combined to form pulse charging of which charging and discharging are simultaneously performed and charging time is larger than discharging time, a triode in the parallel charging unit is connected in a constant-current mode and is also in constant-current charging, two modes of ending after full charging of the battery and timely ending are arranged in measure, the switching is flexible and convenient, sound is reminded after ending, and a required trickle current is provided for a charged battery by the trickle resistor. After implementing the floating charger, the charging time and charging stopping time of the charged battery can be flexibly adjusted, different types of chargedbatteries are adapted, the lifetime of the charger and the charged battery is prolonged to the greatest extent, and environmental friendliness of society is achieved.

The invention discloses a simplified double selection pulse float charger, and belongs to the technical field of electronics. The simplified double selection pulse float charger is composed of a process indicting unit, a voice prompt unit, an N-type charging unit, an N-type discharging unit, an interface unit, a pulse unit, a double-selection termination unit, a load unit, and a trickle resistor.The N-type charging unit and the interface unit, and the pulse unit cooperate so as to form a pulse-type scientific charging method. A constant current triode of the N-type charging unit is connectedin the form of constant current, therefore forming constant current charging. The double selection termination unit has termination after the full charging of the battery and termination after the endof the timing countdown which can easily switch. After the end of charging or discharging, the trickle resistor provides required trickle current to a to-be-charged battery. In the line, the constantcurrent triode serves to control the on and off in charging and provides double functions of a constant current source, thus simplifying the line. The constant current charging apparatus can performcharging in a more scientific manner and provide maximum charging, so that the constant current charging apparatus can increase the service life and capacity of a charger and the to-be-charged batteryat the maximum and protect environment.

The invention discloses oscillation-type environmental protection pulse floating charging equipment, and belongs to the technical field of electronics. The equipment consists of a constant current source, a ring oscillator unit, a charging unit, a discharging unit, a process display unit, an interface unit, a double-end unit, an end change-over switch, a load unit, and a trickle resistor. An integrated circuit employing a phase inverter forms the ring oscillator unit, and controls the discharging unit, controls the charging unit through an interface triode, and achieves the charging and discharging pulse-type charging. Because the current of the charging unit is provided by the constant current source, the charging mode is a constant-current charging mode. Two end modes in the double-end unit are switched through the end change-over switch, and trigger the interface unit, so as to turn off the charging unit, and enable the ring oscillator unit to stop oscillation. A low voltage is outputted, and the discharging unit is turned off. At this moment, the trickle resistor provides a trickle current for a battery, and the charging and discharging units have standby tubes which are substitutes when a working tube is damaged, thereby improving charging reliability.

The invention relates to a double N-type pulse environmentally-friendly charging device and belongs to the electronic technical field. The double N-type pulse environmentally-friendly charging device is composed of a charging part, a pulse generating unit, a termination and starting adjustable unit, a charging display circuit, an termination and starting control unit, a discharging part and a load unit; an oscillation circuit in the pulse generating unit can be a control circuit for forming charging pulses of the charging part and the discharging part. When the charging part is turned on and performs charging, and the discharging part is turned off; when the charging part is turned off, and the discharging part is turned on; and therefore, a scientific pulse charging mode according to which charging time is longer than discharging time can be realized. After a battery is fully charged, the charging part and the discharging part are turned off, and a tiny resistor in the charging part provides maintaining current for a power source. With the double N-type pulse environmentally-friendly charging device of the invention adopted, both of the charging part and the discharging part have a back-up automatic switching function, and therefore, the reliability of a circuit can be ensured, charging-while-discharging pulse charging is realized. The pulse generating unit can flexibly adjust frequency and the time of duty ratio, and therefore, the double N-type pulse environmentally-friendly charging device is convenient and reliable, and can adapt to rechargeable batteries of different capacities.

The invention discloses a charging-stopping pulse charging device, and belongs to the technical field of electronics. The device consists of a constant current source, a process display unit, an interface unit, a charging unit, an annular oscillating unit, a finishing change-over switch, a timing finishing unit, a voltage limiting finishing unit, a load unit, and a trickle resistor. The high and low output of the annular oscillating unit control the on / off of the interface unit, and the interface unit controls the charging unit to be turned on or off, thereby forming pulse-type charging. A current of the charging unit is supplied by the constant current source, so the mode is a constant current charging mode. The timing finishing unit and the voltage limiting finishing unit are switched through the finishing change-over switch, so the device is flexible and reliable. The timing finishing unit and the voltage limiting finishing unit are started, and the annular oscillating unit stops vibrating. Meanwhile, the charging unit is turned off. The trickle resistor supplies a trickle current to a charged battery. After implementation, the device achieves the scientific charging and maximumcharging of a rechargeable battery, thereby prolonging the service life of the charged battery to the greatest extent, enlarging the capacity of the charged battery to the greatest extent, and achieving the social environmental protection.

The invention discloses an N-type pulse double-ending constant current charger belonging to the electronic technology. The N-type pulse double-ending constant current charger is constituted by a constant current source, a process display unit, an interface unit, a charging unit, an oscillation unit used for forming pulse, an ending switching unit, an ending starting unit, a timing counting unit, a load unit, and a trickle resistor. After electrification, the constant current source is used to supply all of units with power, and therefore a charging form is constant current charging. The oscillation unit used for forming the pulse is used to control the interface unit to form high output and low output, and is used to control the switching on / off of the charging unit, and therefore a pulse form is formed. Two ending ways are provided, and according to one ending way, charging of a battery is ended, after the battery is fully charged, and according to the other ending way, the charging of the battery is ended, after the timing counting is in place. The ending switching unit is used to switch the two ending ways flexibly and conveniently, and after the charging is ended, the trickle resistor is used to supply the charged battery with required trickle current. The N-type pulse double-ending constant current charger is advantageous in that all of the units are connected together scientifically, and integrated utilization is realized; the line is simple, and is easy to produce, and is suitable for production of mini-sized enterprises.

The invention discloses a photoelectric high-power microwave amplification method based on a wide-band-gap semiconductor device, and aims to solve the problems of low output power and low amplification efficiency of an existing amplification circuit. According to the technical scheme, firstly, a B-type push-pull amplification circuit based on a wide-band-gap semiconductor device is constructed, wherein the B-type push-pull amplification circuit is composed of two power supplies, two pulse forming devices, two wide-band-gap semiconductor devices, two current-limiting resistors, a load resistorand a grounding end; the two paths of laser pulses and the voltage generated by the two direct-current power supplies act on two wide-band gap semiconductor devices in the amplifying circuit at the same time; the two wide-band-gap semiconductor devices work as light-operated variable resistors under the excitation of photoelectric signals, and the on-resistance of the two wide-band-gap semiconductor devices is linearly changed along with the light intensity of the high-energy pulse cluster laser, so that the output current and the light intensity are changed in a direct proportion, and photoelectric microwaves are amplified. The amplifying circuit is simple in structure, high in working voltage and high in microwave output power, the unipolar limitation is eliminated, and the problem of low output power is effectively solved.

The invention discloses floating charging equipment capable of charging and discharging appropriately, and belongs to the field of electronic technique. The floating charging equipment consists of a process indicating unit, a floating charging unit, a discharging unit, an interface unit, a pulse unit, a timing ending unit, a voice control unit, a load unit and a trickle resistor; after the floating charging unit and the discharging unit are matched with the pulse unit, under the control of the interface unit, a charged battery is charged and also discharged in a pulse charging mode that the charging time is longer than the discharging time; after timing for a timer in the timing ending unit is ended, one of ultimate output ends is converted into low level from high level, the interface unit is controlled, so that the floating charging unit and the discharging unit are turned off; the other of the ultimate output ends is converted into high level from low level, and the voice control unit is not clamped any more, so that voice reminding is emitted by the voice control unit, and sustaining trickle is provided by the trickle resistor after charging is ended. The pulse mode of chargingand discharging is adopted, and scientific charging is realized for the charged battery, so that the maintenance is improved, the service life of the charged battery is prolonged, and the rejection rate is reduced.

The invention discloses a pulse floating charger having a backup, and belongs to the technical field of electronics. The floating charger is composed of a floating charge unit, a discharging unit, a sound control unit, an interface unit, a pulse unit, a selection unit, a computing unit, a voltage limiting starting unit, a load unit, a process indicating unit, a termination unit. The floating charge unit, the discharging unit and the pulse unit are under control of the interface unit, such that the floating charge unit and the discharging unit generate a correct logic and forms a pulse charging form that allows charging and discharging and has a charging time longer than a discharging time. Since the floating charge unit and the discharging unit both have a backup, which ensures the reliability of the floating charge unit and the discharging unit. The pulse floating charger provides two termination, and one is termination after a battery is charged and one is termination after timing and counting arrives in place. The two termination can be flexibly switched to each other. After the termination of the charging, the sound control unit is started so as to provide an alert to users. According to the embodiments of the invention, the pulse floating charger can charge a to-be-charged battery in a scientific manner, improves maintenance, prolongs the service life of the to-be-chargedbattery, and reduces discard rate.

The invention relates to an ending dual-selection low carbon environmental protection float charger and belongs to the electronic technology field. The ending dual-selection low carbon environmental protection float charger comprises a process indication unit, a P-type charging unit, an interface unit, a pulse unit, a dual-selection ending unit, a discharging unit, a load unit and a trickle resistor, wherein the P-type charging unit is in a constant current mode, after the P-type charging unit is matched with the pulse unit and the interface unit, pulse type constant current charging is realized. According to the ending dual-selection low carbon environmental protection float charger, two ending modes are included, one ending mode is utilized after a cell is fully charged, the other endingmode is utilized after timed counting is in place, the two modes can be flexibly switched and are convenient, after ending, the needed trickle current is provided by the trickle resistor for a charged cell, after enforcement, the charging and charging stop time of a charged power source can be flexibly adjusted, adaptation to different types of charged cells is realized, charging ending selectionmodes are added, for first-time charging cells, the timed ending mode is added, the time is accurate, setting the prompting time is not needed, the circuit is simple, production debugging is easy, and the float charger is suitable for micro enterprise production.

The invention discloses a battery floating charge apparatus capable of charging and discharging, and belongs to the technical field of electronics. The battery floating charge apparatus is composed ofa charging unit, a discharging unit, an interface unit, a pulse unit, a selection unit, a load unit, a process indicating unit, and a double-termination unit. The charging unit, the discharging unitand the pulse unit are under control of the interface unit and form a pulse charging form that is capable of charging and discharging and having a charging time greater than a discharging time. The battery floating charge apparatus provides two terminations, one is termination after a battery is charged and the other is termination after timing and counting arrive in place. The two termination methods are flexibly switched to each other. After the termination of the charging, a trickle resistor provides the required trickle to a to-be-charged battery. The discharging unit is provided with a discharging cut-off switch, which makes charging more flexible. The interface unit allows the charging unit and the discharging unit to generate a correct logic within one pulse period, specifically, ifthe charging unit is on, the discharging unit is turned off, and if the charging unit is turned off, the discharging unit is on, so that the charging unit and the discharging unit do not interfere each other. According to the embodiments of the invention, the battery floating charge apparatus greatly increases the service life of chargers and the to-be-charged battery, and reduces discard rate.

The invention discloses a generation device of a high-uniformity single-photon surface light source. The generation device is formed by sequentially connecting the following components: a pulse laserwith the wavelength lambda and the repetition frequency F, and an optical attenuator with the attenuation coefficient beta through an optical fiber, the attenuator is connected with the collimating lens group through an optical fiber; the lens group is aligned with the micro lens with the divergence angle theta; the distance between the optical power probe with the area S and the micro lens is D;beta is changed to enable the power P of the optical power meter to be equal to FhcS / (10 lambda), and then beta is fixed; and F is changed to obtain a high-uniformity single-photon surface light source of 0.1 photon per pulse in a unit area within a + / -2theta angle range on an optical axis vertical plane of the distance D under any laser repetition frequency. The generation device has the advantages that the generated single-photon surface light source has a fixed divergence angle, is high in uniformity, can flexibly modulate the photon rate, covers a large area and a long working distance, and is suitable for the fields of quantum information, single-photon laser imaging and the like.

The invention, which belongs to the field of the electronic technology, provides a PNP type pulse charger comprising a charging display unit, a P type charging unit, an interface unit, an integrated pulse generation unit, a timing control unit, an ending unit, an N type discharging unit, and a load unit. After connection of a power supply, the P type charging unit and the N type discharging unit charge a charged battery in a pulse current manner under control of the integrated pulse generation unit and the interface unit; during the charging process, charging and discharging are carried out simultaneously until the charging ends, wherein the charging process is longer than the discharging process; and a cutting switch in the discharging unit can be used for cutting, so that selection flexibility can be enhanced. After charging time of the charged battery reaches specified time, the charging unit and the discharging unit are turned off and a trickle resistor in the charging unit provides a needed holding trickle current for the charged battery. After implementation of the PNP type pulse charger, all the units are connected scientifically; integrated utilization is realized; the circuit is simplified; and reliability is high.

The invention discloses floating charging equipment capable of automatic switching during damages, and belongs to the technical field of electronics. The floating charging equipment consists of a process indication unit, a charging unit with a substitute, an interface unit, a pulse unit, an ending unit, a load unit, a voice control unit, and a trickle resistor. The charging unit with the substitute achieves a charging circuit, which enables the other working tube to become a substitute when one working tube is damaged, through very few of active parts. The charging unit with the substitute cooperates with the pulse unit, and becomes a pulse charging mode which enables the charging time to be longer than the non-charging time through the control of the interface unit. After full charging ofa battery, the ending unit is started, and the charging unit with the substitute is turned off. The voice control unit gives a voice promote. The charging and non-charging pulse charging unit achieves the scientific charging of a charged battery, improves the maintenance, prolongs the service life of the charged battery, and reduces the rejection rate.

The invention relates to a low carbon charger which belongs to electronic technology field. The charger comprises a process indicating unit, a power charging unit, an interface unit, a pulse unit, a completion unit, a selection unit, a counting unit, a voltage limiting and starting unit, a power discharging unit, a voice control unit, a load unit and a trickle resistor. The welding of the power charging unit is put together with the power discharging unit in order for a constant current form and is subject to the control of the pulse unit; therefore, the time in which power charging and power discharging both occur is longer than pulse constant current charging form of the power discharging time. The voltage limiting and starting unit and the counting unit trigger the completion unit respectively to develop two completion forms for the selection unit to choose from in a flexible and convenient manner. Both the power charging unit and the power discharging unit are provided with a working tube and a standby tube. When the working tube is damaged, the standby tube replaces it for functioning. In this way, the service lifetime of the charger can be ensured. When the power charging is completed, the power charging unit and the power discharging unit are closed; the trickle resistor provides the charged battery trickle current necessary for its maintenance. The units of the invention are well connected, comply with science rules and achieve high reliability in comprehensive use.

The invention relates to a chiral manganese oxide nanoparticle, a preparation method and application thereof, and relates to the technical field of material chemistry. In the chiral manganese oxide nanoparticles described in the present invention, the chiral manganese oxide nanoparticles are obtained by reacting a manganese precursor, tartaric acid and a reducing agent under alkaline conditions; the tartaric acid is L-tartaric acid or D-tartaric acid. The chiral manganese oxide nanoparticles described in the present invention have chiral optical activity at 300-900nm, the preparation method is simple, and the applications are wide. is of great significance.

The invention discloses a double-termination battery floating charge device, and belongs to the technical field of electronics. The floating charge device is composed of a floating charge unit, a discharging unit, a sound control unit, an interface unit, a pulse unit, a selection unit, a load unit, a process indicating unit, a double-termination unit, and a trickle resistor, wherein the floating charge unit, the discharging unit and the pulse unit are under the control of the interface unit, thus forming a pulse charging form that allows charging and discharging and has charging time longer than discharging time. The device includes two termination approaches, one is termination after the battery is charged and the other is termination after the timing runs up, and the two approaches are switched by the selection unit. The floating charge device is flexible and convenient. After the termination, the trickle resistor supplies required trickle current to a to-be-charged battery. In the process of charging, the process indicating unit transmits a light that flickers and is bright. Once charging is terminated, the process indicating unit flashes a long and bright light, and the sound control unit transmits a voice alert to a user. According to the embodiments of the invention, the device can charge the battery in a scientific manner and achieves maximum charging, greatly increasesthe service life of the to-be-charged battery and reduces disability rate.

The invention relates to a parallel floating charger capable of appropriately charging and stopping, and belongs to the technical field of electronics. The parallel floating charger comprises a process indication unit, a P-type parallel charging unit, an interface unit, a pulse unit, a dual-selection ending unit, a discharging unit, a load unit and a trickle resistor. A charging circuit difficultto damage is achieved by a few active pieces, two symmetric charging circuits are arranged in the P-type parallel charging unit, the power is improved, the P-type parallel charging unit is difficult to damage, a diode in each charging circuit is connected in a constant-current mode and is matched with the pulse unit and the interface unit to form pulse constant-current charging, two modes of ending after full charging of the battery and timely ending are arranged in measure, the switching is flexible and convenient, sound is reminded after ending, and a required trickle current is provided fora charged battery by the trickle resistor. After implementing the parallel floating charger, the charging time and charging stopping time of the charged battery can be flexibly adjusted, different types of charged batteries are adapted, the lifetime of the charger and the charged battery is prolonged to the greatest extent, and environmental friendliness of society is achieved.