60results about How to "Avoid the impact of high current" patented technology

The invention discloses a failure testing circuit and method of a power device. The failure testing circuit comprises a first switch, a second switch and a controller. The first switch is connected with the tested device in series, and the first switch and the tested device form a first conducting branch circuit; the second switch is connected with the first conducting branch circuit in parallel; the controller is connected with the first switch and the second switch and used for turning on the first switch and turning off the second switch or turning off the first switch and turning on the second switch according to a detected status signal of the tested device. By means of the failure testing circuit and method, when the tested device fails, a bypass can be switched on in time to dredge current, and therefore it is avoided that the tested device is attacked by large current after failing.

The invention provides a method for protecting a contact point of a relay in a high-power circuit. In the method, controllable silicon is adopted to be connected with the relay in the high-power circuit in parallel, and the controllable silicon is controlled to soften the starting treatment before the closing of the relay so as to preheat a high power load, thereby avoiding heavy current surge on the contact point of the relay. The invention also provides a protection circuit, comprising a resistor, an opto-coupler, the controllable silicon and the relay. By adopting the method and the protection circuit, the controllable silicon softens the starting treatment before the closing of the relay so as to preheat the load, thereby avoiding the heavy current surge caused by the reason that the cold resistance of the load is too low. The method and the protection circuit can be applied to circuits of an oven, a stove, an electrical motor and other high-power products, and can avoid the surge of heavy current and high voltage, thereby effectively protecting the contact point of the relay.

The embodiment of the invention provides a method and system for parallel use of lithium battery modules. The method comprises the following steps: collecting a voltage value of each lithium battery module at the time of initial power-on; and controlling a voltage D-value between each lithium battery module and a busbar based on a voltage-sharing mode in accordance with the collected information,connecting the lithium battery modules to the busbar in sequence, wherein the lithium battery modules have minimum voltage D-values between the lithium battery modules and the busbar, and simultaneously charging and discharging the lithium battery modules which are connected to the busbar. According to the invention, the lithium battery modules can be connected in parallel after the voltage D-values of the lithium battery modules are kept within a range, thus reducing voltage difference among the lithium battery modules and avoiding large current impact among the lithium battery modules, thereby reducing damages to a battery management system (BMS) circuit and improving the safety of the parallel use of the lithium battery modules.

The invention discloses a controller of a current vortex retarder and a control method. The controller comprises a first processing unit, a second processing unit, a power driver and a CAN bus, wherein the first processing unit and the second processing unit are both connected with the CAN bus to ensure that the first processing unit outputs a control signal according to a received operating switch signal, the control signal is sent to the second processing unit through the CAN bus, and the second processing unit controls the on-off time sequence of the stator coil of the current vortex retarder through the power driver. The CAN bus is used for the transportation of data so as to simplify the wiring structure, increase the safety and the reliability for the control of the retarder, realize the real-time communication and display in the work state and realize the information sharing or control between vehicles.

The invention provides an intelligent switch which comprises a load switch, an operating mechanism, a position state indicator, an upper disconnecting switch, a lower disconnecting switch, a current transformer, a first potential transformer, a second potential transformer, an electronic switch, a charging module, a battery and an intelligent device, wherein the load switch is connected on a main circuit and located between the upper disconnecting switch and the lower disconnecting switch; the electronic switch is connected with the load switch in parallel; the current transformer is sleeved on a branch circuit where the load switch is located; and the load switch and the electronic switch are connected in parallel. The first potential transformer and the second potential transformer are respectively connected with the charging module and can charge the battery from two sides; the intelligent device is connected to the current transformer and the charging module, and the battery can provide direct current supply for the intelligent device and the operating mechanism; the battery is connected with the charging module; the operating mechanism is connected with the load switch; and the indicator is connected with the operating mechanism. The invention also provides a control method of the intelligent switch.

The invention discloses a control method and a control system of a digital intelligent crane and a crane controller. A control manner of combining switching amount control and communication control is adopted. The control method adopts the control manner of combining the switching amount control and the communication control; according to the switching amount control manner, a motor is controlled to rotate forwards and backwards through an external switching amount input interface, a communication address is not needed and gear shifting operation cannot be carried out temporarily; according to the communication control manner, forward rotation and backward rotation are controlled through an RS485 bus, and communication addresses on the bus are not repeated; and a resistance box needs to be connected in the two control manners so as to prevent a solid-state relay from being impacted by large current caused by directly starting the motor, so that the fault rate is reduced and the crane can work normally. Furthermore, the invention discloses the crane controller; the controller can commonly use one power supply and one microprocessor, so that the line of a multi-quadrantal crane is simple and the cost is low.

The invention provides an intelligent recloser, which comprises a breaker switch, an operating mechanism, an upper disconnecting switch, a lower disconnecting switch, a current transformer, a high-voltage fuse, a voltage transformer, an electronic switch and an intelligent device, wherein the breaker switch is connected to a main circuit and positioned between the upper disconnecting switch and the lower disconnecting switch; the electronic switch is connected in parallel with the breaker switch; the current transformer is sleeved on a circuit branch of the breaker switch; the breaker switch is connected in parallel with the electronic switch; the intelligent device is connected to the current transformer and the operating mechanism; and the operating mechanism is connected with the breaker switch. The intelligent recloser can intelligently detect whether a fault exists, and can be reclosed or closed correspondingly to a latch, thereby greatly reducing harm to dash current, prolonging service life of the switch and greatly shortening interruption maintenance time.

The invention discloses a supercapacitor three-stage charging circuit comprising a Buck converter circuit, a current sampling circuit, a charging mode control circuit and a charging driving circuit. A supercapacitor is connected with the output end of the Buck converter circuit. The current sampling circuit is connected with the Buck converter circuit. The charging mode control circuit is connected with the output end of the current sampling circuit, the supercapacitor and the reference voltage output end of the charging driving circuit. The charging driving circuit is connected with the output end of the charging mode control circuit and the output end of the current sampling circuit. The Buck converter circuit is connected with the PWM signal output end of the charging driving circuit. The invention also discloses a supercapacitor quick charging method of the supercapacitor three-stage charging circuit. The supercapacitor three-stage charging circuit is convenient to implement and low in cost so that charging speed of the supercapacitor can be enhanced, working stability and reliability are high, the charging and discharging performance of the supercapacitor can be effectively protected and practicality is high.

The invention relates to the field of power semiconductor devices, and discloses a preparation method of a novel light break-through IGBT device. According to the IGBT device prepared by the preparation method, the structure of an N-type carrier storage layer and a P+ type floating layer is integrated, the IGBT device has advantages of high breakdown voltage, low forward conduction voltage drop and low turn-off loss, and the structure of N+ doping block layers and insulating block layers which are arranged in a staggered and spacing way side by side is arranged between a second P+ doping layer and a gate oxide layer so that the resistance value of an internal emission electrode integrated resistor can be greatly increased, increasing of internal saturation current can be effectively suppressed, the short circuit safe operating area of the IGBT device is expanded, and thus generation of high current impact can be avoided and the operating life of the device can be ensured.

The invention discloses a hybrid electric vehicle composite power supply for self-adapting filter power dividing control and a self-adapting filter power dividing control method. The composite power supply comprises a storage battery, a super capacitor and a bidirectional DC / DC (Direct Current / Direct Current) convertor, wherein the storage battery is connected with a power bus to be used as a main power supply; the super capacitor is connected with the power bus by the bidirectional DC / DC converter and is connected with the bidirectional DC / DC converter in series to form an auxiliary power supply. The self-adapting filter power dividing control method is used for controlling the bidirectional DC / DC converter. The super capacitor in the composite power supply is used for carrying out power compensation on the storage battery so as to prevent from providing instantaneous power and peak power by the battery; the whole efficiency of the composite power supply is obviously improved; the super capacitor can be used for rapidly and efficiently charging and discharging by large current and regenerative braking energy is recycled to the greatest extent; the self-adapting filter power dividing control method realizes the reasonable distribution of power, guarantees that all parts of the composite power supply are efficient obtains the good control effect.

The invention discloses a super capacitor multi-mode quick charge circuit design method, which comprises the following steps: 1) selecting resistance of a resistor RS; 2) enabling one end of the resistor RS to be connected with the cathode output end of a Buck convertor circuit, and enabling the other end of the resistor RS to be grounded; 3) selecting elements having appropriate parameters and forming a charging mode control circuit; 4) connecting the elements to form the charging mode control circuit; 5) selecting elements having appropriate parameters and forming a charging drive circuit; 6) connecting the elements to form the charging drive circuit; and 7) connecting the Buck convertor circuit, a voltage source, a super capacitor and the charging drive circuit to form a super capacitor multi-mode quick charge circuit. The method is simple in steps, reasonable in design, convenient to realize, high in practicality and convenient for popularization use.

The invention discloses a passive series composite power source braking energy recovery system. The passive series composite power source braking energy recovery system comprises a storage battery, a motor, a motor controller, a rectifier bridge, a supercapacitor, diodes, a switch and a controller. During regenerative braking, a three-phase counter electromotive force only charges the supercapacitor through the rectifier bridge, and the storage battery dose not participate in energy recovery; in the driving process, the storage battery is in series connection with the supercapacitor to output electric energy; through the diodes in parallel, the battery is prevented from conducting reverse charging on the supercapacitor; the system can be switched to be in storage battery single driving mode, and thus energy consumption of an output current on the diodes during long-time outputting is avoided; the controller controls switching of the switch, the strict requirements during switching are avoided, that is, zero-current switching can be conducted in a non-driving state; and the controller continuously detects the voltage at the supercapacitor end, the voltage of the storage battery, and the braking vehicle speed, and sends a PWM signal to control on-off of a thyristor in the rectifier bridge, direct current chopping of a braking current is achieved, and the electric braking deceleration is controlled. The passive series composite power source braking energy recovery system utilizes the rectifier bridge to recover braking energy, and the energy utilization rate is increased.

The invention provides a battery discharging parameter identification method and system for an electric vehicle. The method includes the steps that when a discharging parameter of the electric vehicleis recognized, a bus capacitor voltage of the electric vehicle is detected; when the voltage is less than a preset HPPC discharging test threshold, a bus circuit of the electric vehicle is turned offto prepare pre-charging for a bus capacitor; the discharging current of a battery is controlled through a pre-charging and discharging module of the electric vehicle to obtain a preset discharging test current condition, and the bus capacitor is pre-charged through the preset discharging test current condition; HPPC discharging test is carried out on the battery through the discharging test current condition, voltage and current change data of the battery is collected online, then the discharging parameter of the battery is obtained, and thereby on-line recognition of the discharging parameter of the battery is realized. The battery discharging parameter identification method and system for the electric vehicle have the advantages that the test process of charging and discharging parameters of the battery and the corresponding test system are simplified, the operability is strong, at the same time, the service life of the bus circuit is prolonged, and the energy consumption during testing is reduced.

The invention provides methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of a microgrid. The control method comprises the steps of: adjusting the voltage magnitude output by a main support power supply at a tracking side through iteration, so that the voltage magnitude at the tracking side successively approximates the voltage magnitude at areference side along with iteration till the absolute value of a difference value between the voltage magnitude at the tracking side and the voltage magnitude at the reference side is less than or equal to a first pre-set threshold value; adjusting the frequency output by the main support power supply at the tracking side through iteration, so that the frequency at the tracking side successively approximates the frequency at the reference side along with iteration till the absolute value of a different value between the frequency at the tracking side and the frequency at the reference side isless than or equal to a second preset threshold value; and, adjusting the phase output by the main support power supply at the tracking side through iteration, so that the phase at the tracking side successively approximates the phase at the reference side along with iteration till the absolute value of a different value between the phase at the tracking side and the phase at the reference side isless than or equal to a third preset threshold value, therefore, voltage synchronization of the tracking side and the reference side is realized.

The invention discloses a super capacitor and lead-acid cell mixed chemical power supply. The power supply comprises a lead-acid cell monomer and an organic electric double layer super capacitor which are directly connected in parallel into a mixed monomer, and six mixed monomers are connected in series to form a 12V mixed power supply unit. The power supply system is a passive mixed power supply system that the super capacitor is directly connected in parallel with the lead-acid cell; no control element is required between the super capacitor and the lead-acid cell; the lead-acid cell provides a function of voltage threshold protection for the super capacitor which is connected in parallel with the lead-acid cell to ensure that the super capacitor does not require a voltage threshold protective element; and the super capacitor shares the condition of high-power pulse discharge for the lead-acid cell to avoid high current impact of the lead-acid cell and greatly prolong the service life of the lead-acid cell. The power supply can be widely applied in the fields of electric bicycles, electric motorcycles, golf buggies, automobile starting, electric vehicles and the like.

The invention provides a DC-AC inverter device for ship regional power distribution, which includes a dual-power input selection unit, a charging current limiting unit, a DC input filter network, a power inverter, a sine wave filter, and a three-phase isolation transformer which are successively connected in series; a sensor disposed in a power transmission circuit of an inverter device; and a core control unit connected to the signal input terminal of the inverter device through a signal output terminal and connected to the signal output terminal of the sensor through a signal input terminal.The DC-AC inverter device realizes the energy conversion from DC700V-1000V to AC380V in A ship DC regional power distribution system by means of space vector pulse width modulation and voltage and current double closed-loop control, provides a three-phase AC power output for the AC load of the DC regional power distribution system, has fast response, stable operation and reliable characteristics,achieves remote monitoring through network communication, and improve the reliability and security of power supply in the ship regional power distribution system.

The invention provides a DC-DC chopping device for ship regional power distribution, which includes a dual-power input selection unit, a charging current limiting unit, an LC filter network, a high-frequency inverter unit, a high-frequency isolation transformer, a high-frequency rectifying unit, and a DC output filter network which are successively connected in series; a sensor disposed in a powertransmission circuit of a chopping device; and a core control unit connected to the signal input terminal of the chopping device through a signal output terminal and connected to the signal output terminal of the sensor through a signal input terminal. The DC-DC chopping device realizes the energy conversion from DC700V-1000V to DC220V in a ship DC regional power distribution system by means of SVPWM and voltage and current double closed-loop control, provides a DC220V power output for the DC load of the DC regional power distribution system, has fast response, stable operation and reliable characteristics, achieves remote monitoring through network communication, and improve the reliability and security of power supply in the ship regional power distribution system.

The invention discloses a multi-output power management circuit which is in communication connection with an upper computer, wherein the upper computer outputs a power control instruction according toload demands; the multi-output power management circuit comprises a power input interface for inputting a power signal, a plurality of voltage conversion circuits, a controller and a power module; the plurality of voltage conversion circuits are connected with the power input interface separately and are arranged to carry out current and / or voltage conversion; the controller is connected with theupper computer, is provided with a plurality of enable pins connected with the plurality of voltage conversion circuits separately and is arranged to output corresponding enable signals to enable thecorresponding voltage conversion circuits to work to output required electric signals according to the power control instruction; and the power module is connected between the power input interface and a power pin of the controller and provides the controller with electricity. The problems that a traditional power management circuit is complicated in system, high in cost and large in occupied space are solved.

The invention provides a heat transfer type resistance box and relates to electric heating equipment. The heat transfer type resistance box is composed of an upper box body, an air pipe array, a lower box body and a resistance wire. The upper box body is communicated with the lower box body, a heat exchange area is constituted by the inner space of the upper box body, the air pipe array is arranged in the heat exchange area, a front air chamber is arranged on the left side of the upper box body, a rear air chamber is arranged on the right side of the upper box body, and the front air chamber is communicated with the rear air chamber through intra-pipe spaces of the air pipe array. A heat transfer area is constituted by the inner space of the lower box body, the resistance wire is arranged in the heat transfer area, a front conductive support is arranged at the front end of the inner space of the lower box body and mounted at the inner end of a wire inlet assembly, a rear conductive support is arranged at the rear end of the inner space of the lower box body and mounted at the inner end of a wire outlet assembly, and the two ends of the resistance wire are connected to the front conductive support and the rear conductive support through mounting parts. The heat transfer type resistance box is used for high-power plasma equipment treating household garbage and enables network voltage to be stable and a plasma torch to work stably; heat of the resistance wire is transferred through heat conduction oil, and heat energy is recovered for drying garbage.

The invention discloses a farad capacitor charger which is a wireless charger aiming at charging a farad capacitor, and the farad capacitor charger can convert electric energy to magnetic energy to send out. The farad capacitor comprises a launch control (LC) resonance emitting return circuit, an emitting actuator, a timer, a reed switch and a group of electronic switches. The resonance emitting return circuit is controlled by the emitting actuator which is controlled by the timer, and the timer is controlled by the electric switches which are controlled by the reed switch. The LC resonance emitting return circuit is a parallel connection type resonance emitting circuit, one end of the LC resonance emitting return circuit is connected with a positive pole of a power source, and the other end of the LC resonance emitting return circuit is connected with an output end of the emitting actuator. The power source end of the emitting actuator is connected with an output end of the timer, and the ground end of the emitting actuator is connected with a negative pole of the timer. The power source end of the timer is connected with the positive pole of the power source, the electronic switches are connected between the negative pole of the power source and the negative pole of the timer in series, and the reed switch is connected on the positive pole of the power source and at the control ends of the electronic switches.

The invention relates to a bidirectional charging / discharging device and a bidirectional charging / discharging method for an accumulator. The device comprises a controller, a change-over switch, a charging / discharging switch tube, a discharging switch tube, a first freewheel diode, a second freewheel diode, a normally-closed contactor, a third freewheel diode, the accumulator, an actual load, a charger and a battery current sensor. According to the device and the method provided by the invention, bidirectional DC / DC can be achieved under the premise of only using a set of circuits.

The invention relates to the technical field of rail locomotives. The invention discloses a pure electric rail locomotive power battery safety guarantee method. The guarantee method comprises the following steps: setting good physical insulation isolation and double-branch physical isolation between battery modules, reasonably setting fuses, carrying out total positive and total negative physicalisolation, and adopting safe system power-on and power-off strategies. According to the method, through the measures, the power batteries are protected, faults such as short circuit, grounding and local out-of-control expansion of the power batteries are prevented, and the safe application of the power batteries is ensured.

The invention relates to a charging circuit for the storage battery of a solar energy illumination system, comprising: a pulse width modulating control chip, a first main power transformer, also comprising: one end of a sampling resistance for charging current is connected with the grounded winding of the main power transformer, the other end of the sample resistance is connected with the negative pole of the storage battery and the same phase end sixteenth pin of the pulse width modulating control chip respectively; one end of the twenty third resistance network is connected with the fifteenth pin of the pulse width modulating control chip, the other end of the twenty third resistance network is connected with the third pin of the pulse width modulating control chip; one end of the thirty third resistance network is connected with the grounded end of the first main power transformer, the other end of the thirty third resistance network is connected with the fifteenth pin of the pulse width modulating control chip; the two ends of the thirty forth resistance network are connected with the fifteenth pin and the fourteenth pin of the pulse width modulating control chip respectively; because a constant current / constant voltage charging mode autochangeover is adopted, so that high current surge is prevented, the lifetime of the storage battery is prolonged.

The invention discloses an LED driving system which comprises a power supply module, an LED driving adjustment module, an LED control switch, a soft start module and an LED module. The power supply module, the LED module and the LED control switch are sequentially connected. The input end of the LED module is connected with the voltage sampling input end of the LED driving adjustment module. The output end of the LED control switch is connected with the current sampling input end of the LED driving adjustment module. The output end of the LED driving adjustment module is connected with the control input end of the LED control switch. The output end of the power supply module is connected with the input end of the soft start module. The output end of the soft start module is connected withthe control input end of the LED control switch. The soft start module is used to soft start the LED module. The soft start module enables the LED module to be turned on at the zero crossing point ofalternating current to prevent the LED module from large current shock.

The invention provides a heat transfer type resistance box and relates to electric heating equipment. The heat transfer type resistance box is composed of an upper box body, an air pipe array, a lower box body and a resistance wire. The upper box body is communicated with the lower box body, a heat exchange area is constituted by the inner space of the upper box body, the air pipe array is arranged in the heat exchange area, a front air chamber is arranged on the left side of the upper box body, a rear air chamber is arranged on the right side of the upper box body, and the front air chamber is communicated with the rear air chamber through intra-pipe spaces of the air pipe array. A heat transfer area is constituted by the inner space of the lower box body, the resistance wire is arranged in the heat transfer area, a front conductive support is arranged at the front end of the inner space of the lower box body and mounted at the inner end of a wire inlet assembly, a rear conductive support is arranged at the rear end of the inner space of the lower box body and mounted at the inner end of a wire outlet assembly, and the two ends of the resistance wire are connected to the front conductive support and the rear conductive support through mounting parts. The heat transfer type resistance box is used for high-power plasma equipment treating household garbage and enables network voltage to be stable and a plasma torch to work stably; heat of the resistance wire is transferred through heat conduction oil, and heat energy is recovered for drying garbage.

The invention particularly relates to an automatic variable-frequency variable-amplitude vibrating device and a vibration regulation method thereof. The automatic variable-frequency variable-amplitude vibrating device comprises at least two pairs of four servo motors, a transmission shaft, a coupling, an inertial eccentric shaft, and a vibrating table. The servo motors are the same in speed and opposite in direction. Output shafts of the servo motors are connected with the transmission shaft; the other end of the transmission shaft is connected with the inertial eccentric shaft through the coupling; the inertial eccentric shaft is fixed below the vibrating table through a bearing. The automatic variable-frequency variable-amplitude vibrating device is simple in structure, efficient and energy saving; high-current impact caused by heavy-load frequency startup of motors in a non-automatic variable-frequency variable-amplitude system is overcome; meanwhile, failures and efficiency loss of synchronous gear cases or pulley boxes and the like are avoided.