275results about How to "Wide voltage range" patented technology

Disclosed is a method and apparatus for providing a light emitting diode and driving circuitry integrated into a component module that will retrofit common incandescent lightbulb applications. The disclosed embodiments will perform with high efficiency at a wide operating voltage range with a very small size allowing for the incorporation within the envelope and form of existing lightbulb bases. Therefore, a single universal LED light bulb module can be used to replace the dozens of conventional LED and incandescent lights currently being used. The electronic circuitries used to drive the LEDs are extremely compact and consequently can be incorporated in nearly any standard bulb base.

The invention relates to an electrothermal film and a manufacturing method thereof, belonging to the technical field of semiconductor heating. The electrothermal film is mainly prepared by adopting stannic chloride, titanium tetrachloride, stannic chloride, titanium trichloride, ferric chloride, antimony trichloride, calcium chloride, potassium chloride, cadmium chloride, stannic dioxide, stannictetroxide, hydrofluoric acid, boric acid, ethanol, isopropyl alcohol and inorganic water. By adopting the above formula, the mixture is mixed, stirred and heated to prepare into electrothermal film treating fluid, a semi-finished product of the electrothermal film is obtained by spraying the electrothermal film treating fluid at negative pressure on the electrothermal film carrier, and then silveroxide slurry is coated on the semi-finished product of the electrothermal film for baking to form a finished product of the electrothermal film. The electrothermal film has reasonable proportion andsimple manufacturing process, can be manufactured into various electrothermal film heating devices, has a working temperature capable of being up to 500 DEG C, and has wider application range. The electrothermal film of the invention also has the function of far infrared radiation, can play a role of physical therapy and health care to human body, and can help improve the quality and output of agricultural products.

An uninterruptible power supply (UPS) provides DC output power and uses a plurality of relatively low power DC / DC converters which are of much higher efficiency and lower heat dissipation than inverters normally used in UPS devices to provide AC output power. Power is stored at high voltage in capacitors to provide output power when input power may be interrupted. Since the power dissipation is reduced and use of batteries can be avoided where redundant input power sources are available, the UPS made be made very compact and of light weight as is particularly suited to mobile machinery such as aircraft, water-borne vehicles and the like.

A rectifier for rectifying alternating current into direct current is described, in which a three-phase generator includes a three-phase stator winding. The phases of the stator winding are triggered via switching elements of a power circuit. The power circuit is controlled via a control part, which includes a controller component. The rectifier includes a control part (control module) having control terminals and a power circuit (power module) controlled by the control module and optionally provided with a cooling device, in which all the power-conducting components are designed as power MOS components and integrated in a stacked construction.

A linear voltage controlled capacitance circuit is provided that includes a plurality of MOS varactor pairs. Each MOS varactor pair is operable to receive a first tuning voltage, a second tuning voltage, and a bias voltage unique to the MOS varactor pair. The capacitance circuit is operable to generate a positive tank node signal and a negative tank node signal based on the first and second tuning voltages and the bias voltages. A means to control voltage-to-capacitance gain is also provided to compensate for coarse tuning capacitance change.

A MOS capacitor in a charge pump includes a MOS device with at least one body bias region and a device body of a same conductivity type for providing maximum capacitance over a wide voltage range. The MOS capacitor also includes a gate forming a first terminal of the MOS capacitor, and the at least one body bias region forms a second terminal of the MOS capacitor. The MOS capacitor further includes a multiple-well structure formed with the device body and a deep well in a substrate for enhanced noise immunity.

An output buffer utilizes capacitive feedback to control the output slew rate largely independent of load capacitance. The invention slows the rising and falling slew rates and via a capacitance feedback reduces the effect of load capacitance on slew rate, and uses no DC current. Transistor switches are employed to isolate and reduce noise and interaction among the circuit components and functions.

An output buffer utilizes capacitive feedback to control the output slew rate largely independent of load capacitance. The invention slows the rising and falling slew rates and via a capacitance feedback reduces the effect of load capacitance on slew rate, and uses no DC current. Transistor switches are employed to isolate and reduce noise and interaction among the circuit components and functions.

The battery system has a current detection circuit 2, an amplifier 6, and a detection circuit 7 that detects the current flowing through batteries 1 from amplifier 6 output. The current detection circuit 2 is provided with a voltage source circuit 8 that supplies a test voltage to the input-side of the amplifier 6. Current detection lines 10 connect the current detection resistor 5 to the input-side of the amplifier 6, and the detection circuit 7 stores a reference voltage corresponding to the current detection lines 10 in the connected state. When the voltage source circuit 8 supplies the test voltage to the input-side of the amplifier 6, the detection circuit 7 compares the amplifier 6 output voltage with the reference voltage. The detection circuit 7 detects an open-circuit in the current detection lines 10 by the shift in voltage from the reference voltage.

A voltage level translator circuit for translating an input signal referenced to a first voltage supply to an output signal referenced to a second voltage supply includes an input stage for receiving the input signal, the input stage including at least one transistor device having a first threshold voltage associated therewith. The voltage level translator circuit further includes a latch circuit operative to store a signal representative of a logic state of the input signal, the latch circuit including at least one transistor device having a second threshold voltage associated therewith, the second threshold voltage being greater than the first threshold voltage. A voltage clamp circuit is connected between the input stage and the latch circuit. The voltage clamp circuit is operative to limit a voltage across the input stage, an amplitude of the voltage across the input stage being controlled as a function of a voltage difference between the first and second voltage supplies.

Some embodiments include an electric power conversion apparatus, which may include a transformer, a first converter connected to a primary side of the transformer, a second converter connected to a secondary side of the transformer, a first capacitor connected to the first converter, a second capacitor connected to the second converter, and a control unit for controlling the first converter and the second converter, wherein the control unit may determine operation ranges with respect to a plurality of modulation methods, may determine a modulation method including an output electric power value of the electric power conversion apparatus among the operation ranges of the plurality of modulation methods, and may output control signals of the first converter and the second converter based on the determined modulation method, wherein the control signals correspond to an instruction value.

Disclosed are current sink and source circuits, a charge pump that incorporates them, and a phase locked loop that incorporates the charge pump. The current sink and source circuits each have a current mirror that biases a transistor connected to an output node. These circuits each further have a two-stage feedback amplifier to sense the current mirror drain voltage and to control the transistor gate voltage in order to stabilize the current mirror drain voltage independent of output voltage at the output node. The amplifier also increases output resistance at the output node. This configuration allows for a wide operation voltage range and ensures good circuit performance under a very low power supply. A charge pump that incorporates these circuits generates highly matched charging and discharging currents. A PLL that incorporates this charge pump exhibits minimal bandwidth shifts and minimal locking speed and jitter performance degradation.

An inverter device, an energy storage system comprising such an inverter device, and a method of controlling such an inverter device are provided. The inverter device has a split-phase, transformer-less configuration and is connectable between a battery and a power grid for transferring power in a bidirectional manner between said battery and said power grid. The inverter device further comprises: an inverter circuit comprising switching elements arranged in a multilevel clamped topology; and a control unit controlling said switching elements, wherein said control unit is configured to control said switching elements such that direct current (DC) power from said battery is transformed into alternating current (AC) power and supplied to said power grid during a discharging period, and AC power from said power grid is transformed into DC power and supplied to said battery during a charging period.

The present invention provides a method for preparing a positive active material for a secondary lithium battery. The method includes the steps of: synthesizing an intermediate product of a core represented by formula LixMyN1-yO2-αAβ; adding P source into the intermediate product to obtain a phosphate which does not contain lithium; and adding lithium source into the mixture of the phosphate and LixMyN1-yO2-αAβ and sintering to obtain the positive active material for secondary lithium battery. The method for preparing a positive active material for a secondary lithium battery of the present invention has the following advantages: 1) the P source can be dispersed on the surface of the core more uniformly; 2) the coating layer can be bonded to the core more tightly; and 3) the positive active material has higher rate discharge performance.

The invention discloses a flexible super capacitor. The flexible super capacitor comprises a packaging thin film, a first electrode, a second electrode and an electrolyte thin film located between the first electrode and the second electrode; the first electrode comprises a first pole piece, and the second electrode comprises a second pole piece; the first pole piece and the second pole piece are made of the same material; the electrolyte film is prepared by adsorbing a gel electrolyte after a diaphragm is soaked in the gel electrolyte of ionic liquid or prepared by coating the gel electrolyte of the ionic liquid on the diaphragm. Moreover, the invention further discloses a preparation method of the flexible super capacitor. According to the flexible super capacitor and the preparation method thereof provided by the invention, since the electrolyte thin film is prepared by adopting the gel electrolyte of the ionic liquid with a high conductivity, the flexible super capacitor does not need a traditional liquid injection process, and the scope of application of voltage and temperature is wide, thus the flexible super capacitor is suitable for pipelined large-scale production.

To provide a voltage controlled variable capacitor which can change a capacitance value thereof in a wide controlled voltage range and control the capacitance value easily with a high precision without complicating the circuit configuration thereof, and to provide a voltage controlled variable capacitor which can change a capacitance value thereof with a good linearity. The voltage controlled varactor is configured in a manner that varactors VCk, each formed by a series connection of a fixed capacitor Ck (k=1, 2, - - - , n) and a MOS transistor Mk of N channel type, are connected in parallel. The MOS transistors M1 to Mn are configured in a manner that gate widths W are same but gate lengths L1 to Ln are elongated sequentially (that is, L1<L2< - - - <Ln) so that the threshold voltages thereof are differentiated from one another.

The invention relates to a defrosting control system for a door switch counting refrigerator, which comprises a thermostat theta1, a thermostat theta2, a heater H1, a compressor CM, a fan M, an illuminating lamp L, a door switch K and a fuse F, and also comprises an integrated electronic counting timer 6, wherein a pin 3 on the power end of the integrated electronic counting timer 6 is connected with a power supply through the thermostat theta1; a pin 2 on the defrosting output end is connected with the fuse F and the heater H1 through the thermostat theta2; a pin 4 on the output end is respectively connected with the fan M and the compressor CM; a pin 1 on the defrosting detection end is respectively connected with the thermostat theta2 and a fuse 5; and a pin 5 on the detection end of the door switch is connected with the illuminating lamp L and one end of the door switch K, and the other end of the door switch K is connected with the power supply. The defrosting control method is to increase the door opening frequency of the refrigerator and perform defrosting control on the wind-cooled refrigerator on the basis of the prior pure accumulated time defrosting mode.

The invention discloses a self-powered super capacitor energy-storage power source for detecting line faults. The self-powered super capacitor energy-storage power source comprises a rectifying circuit, a pre-charging and by-pass switch circuit, a two-way controllable switch circuit, a charging and discharging control circuit, a super capacitor, an overvoltage control and driving circuit and a reference circuit. The rectifying circuit and the pre-charging and by-pass switch circuit are connected between a current transformer and a fault detecting device and are used for providing power output. The two-way controllable switch circuit is connected with the pre-charging and by-pass switch circuit and is used for controlling the super capacitor to be charged and discharged. The charging and discharging control circuit is connected with the two-way controllable switch circuit and is used for controlling the two-way controllable switch circuit to be connected and disconnected. The super capacitor is connected with the charging and discharging control circuit and the two-way controllable switch circuit and is used for energy storage. The overvoltage control and driving circuit is connected between the pre-charging and by-pass switch circuit and the reference circuit and is used for conducting overvoltage protecting control and driving. The input end of the reference circuit is connected to the pre-charging and by-pass switch circuit, and the output end of the reference circuit is connected with the charging and discharging control circuit and the overvoltage control and driving circuit. The self-powered super capacitor energy-storage power source can stably operate in line fault detection for a long time.

A circuit is disclosed that comprises a capacitor gain-boost circuit and an amplifier coupled to capacitor gain-boost circuit. A capacitor gain-boost circuit comprises of capacitor, gain-boost amplifier and biasing circuit. The gain-boost amplifier and capacitor provides optimum biasing operation and performance. Accordingly, through the use of capacitor gain-boost circuit, the supply voltage range and power consumption of an amplifier is optimized while the gain of amplifier is improved.

An apparatus comprises a reference voltage bias generator configured to generate a first reference voltage and a second reference voltage. During a low supply mode, the first reference voltage is equal to a supply voltage potential and the second reference voltage is equal to a ground potential. During a high supply mode, the first reference voltage is equal to a first fraction times the supply voltage potential and the second reference voltage is equal to a second fraction times the supply voltage potential. The apparatus further includes a reference voltage booster coupled to the reference voltage bias generator, wherein the reference voltage booster is configured to generate the first reference voltage and the second reference voltage with increased drive capability.

The present invention relates to a control method of a low voltage operation constant speed air conditioner, which is characterized in that the rotary speed of an indoor electric motor is adjustable, when the network voltage is changed, a conduction angle of a controlled silicon in a motor-drive circuit is adjusted in order to stabilize the rotary speed of the indoor electric motor, the different rotary speed shifts of an outdoor electric motor are changeable, under different ranges of the network voltage and / or different external disk temperature of the outdoor condenser, the outdoor electric motor operates on the different rotary speed shifts, controlling compressor overflowing protection, the closing down overflowing protection of the compressor is fed with the protection current value lower heat protector before the system heat protector feeds protection, and the batch restart of the compressor are completed within the setting time after feeding protection. The air conditioner of the present invention can be normal starting under 180V even under the condition of lower electric voltage and keep operation, the abnormal noise can be avoided when the electric network fluctuates, and the present invention can be active closing down protection and rapidly be automatic recovery normal running after electric voltage resumption.

The invention provides a parameter-regulable universal RS232-CAN (Controller Area Network) bus adapter. A 232 interface level switch module is connected with a serial device; a CAN bus transceiver interface module is connected with a CAN bus networking device in a plugging way; a microprocessor reads configuration file information in a data storage module, and sets Baud rate and CAN bus data transmission rate of serial communication, and after the CAN bus transceiver interface module receives data, the data is sent out through the 232 interface level switch module; after the 232 interface level switch module receives the data, the data is transmitted into a CAN bus communication network through the CAN bus transceiver interface module in a message type. According to the parameter-regulable universal RS232-CAN bus adapter, the communication parameters can be modified and set according to the need, the performance is stable, the instantaneity is good, the universality is strong, the setting is simple, the operation is convenient, and the use is more flexible.

The invention discloses a synchronous boost-buck device and a synchronous buck-buck method thereof. The synchronous boost-buck device comprises an MCU (Microprogrammed Control Unit), an input voltage sampling module, an output voltage sampling module, an output current sampling module and a synchronous boost-buck conversion module, wherein the MCU is respectively connected with the input voltage sampling module, the output voltage sampling module, the output current sampling module and the synchronous boost-buck conversion module, the input voltage sampling module and the output voltage sampling module are respectively connected with an input port and an output port of the device, and the synchronous boost-buck conversion module is respectively connected with the input port, the output port and the output current sampling module. In the invention, the synchronous boost-buck conversion module is started for boosting or bucking or first boosting and then bucking through an input voltage acquired by the input voltage sampling module, and meanwhile, the synchronous boost-buck conversion module is controlled to output a corresponding voltage value and a corresponding current value according to an output voltage and an output current so as to satisfy the power supply needs of portable equipment.

The invention discloses a positioning device based on a global positioning system (GPS)-ZIGBEE dual-mode positioning technology. The device comprises a GPS positioning module. The GPS positioning module is connected with a serial port of a singlechip. A first ZIGBEE module is connected to the singlechip, and is connected with a first receiving antenna. A second ZIGBEE module is also connected to the singlechip, and is connected with a transmitting antenna. A control unit and a power supply are also connected to the singlechip. The GPS positioning module is also connected with a second receiving antenna, and analyzes and decodes a received signal. The decoded signal is transmitted to the singlechip for processing, and the processed signal is transmitted to the first and second ZIGBEE modules for transmission or forwarding to other interfaces. After the signal is forwarded for many times, an upper computer processes received information and displays the processed information on a display. A ZIGBEE positioning system is automatically started under the condition that a satellite signal cannot be received. The positioning device has the characteristics of low power consumption, ultra long standby time, small volume, light weight, convenience of carrying and adaptability to various severe environments.

An electrical power system includes an alternating current (AC) power source configured to output an AC signal, a single phase pulse-width modulated (PWM) rectifier coupled to the AC power source and to an electrical load; a DC link capacitor coupled in parallel to the load and the PWM rectifier; and an active ripple energy storage circuit. The active ripple energy storage circuit has a first terminal, a second terminal and a third terminal, the active ripple energy storage circuit being coupled in parallel to the electrical load, the PWM rectifier and the DC link capacitor via the first terminal and the second terminal, the third terminal being coupled to the second terminal, the active ripple energy storage circuit being configured to selectively absorb and discharge at least part of the ripple energy.

Disclosed is a power control method for a radio frequency power amplifier, comprising the following steps: S1. reading a power source voltage signal and a power control signal and generating an amplified signal having a linear relationship with the power control signal; S2. according to the amplified signal and saturation information, generating one or more controlled currents, merging each controlled current, and converting the merged total current into voltage; S3. Conducting linear voltage regulation on the converted voltage and generating a base control voltage of the radio frequency power amplifier. The present invention dynamically monitors the saturation information of a pass element to change the base voltage of the radio frequency power amplifier, thus improving additional power efficiency of the radio frequency power amplifier at multiple power level and over a large power source voltage range, and improving the properties of the radio frequency switch thereof.

Disclosed an energy-saving relay circuit, comprises impulsion direct current power source E, capacitor C, relay J, diode D, and pilot switch K. Wherein, the impulsion direct current power source can charge the capacitor C when the pilot switch K is opened, and control the relay J close when the pilot switch is closed; since the limitation of efficient output power of impulsion direct current power source, the closed relay J will work in a low voltage to maintain the adherent; the impulsion direct current power source E will charge the capacity C repeatedly when the pilot switch K is opened, to operate the on-off operation repeatedly for energy saving.