238 results about "Rectifier diodes" patented technology

The invention relates to a composite function converter suitable for a multi-phase high-speed permanent magnet direct-current generator. An uncontrolled rectifier bridge arm is formed by connecting two high-frequency rectifier diodes in series; the controllable rectifier bridge arm is formed by connecting two IGBTs (Insulated Gate Bipolar Translator) with antiparallel diodes in series; an upper tube IGBT collector of the controllable rectifier bridge arm and a cathode of an upper tube diode of the uncontrolled rectifier bridge arm are connected in parallel with an anode of the intermediate bus capacitor; the emitting electrode of the lower tube IGBT and the anode of the lower tube diode of the uncontrolled rectifier bridge arm are connected in parallel with the cathode of the intermediate bus capacitor; the emitting electrodes of the upper tubes IGBT of the controllable rectifier bridge arms are respectively connected to the output end of the generator; the anodes of the upper diodes of the uncontrolled rectifier bridge arms are respectively connected to the other output ends of the generator; the interleaved BUCK module is connected between the intermediate DC bus capacitor and the load, and the BUCK control unit is used for controlling the interleaved BUCK module to operate; and the barring control unit is used for controlling the controllable rectifier bridge arm to realize a generator barring function.

An isolated switching power supply circuit is compact, high-efficiency, and low noise. It includes a transformer T1 which has a primary winding wound with NP turns and a secondary winding wound with NS turns, a drive switch Q1 and an active clamp switch Q2 configuring a primary side half-bridge, a boost capacitor CBULK1 that charges a discharge energy of the transformer, rectifier diodes D1 and D2 connected in series, a tank capacitor CT1, and an output capacitor COUT1. A secondary side winding voltage, when the drive switch Q1 or the active clamp switch Q2 is on, is held in the tank capacitor CT1, and by superimposing the secondary winding voltage, when the drive switch Q1 or the active clamp switch Q2 is off, on the voltage held in the tank capacitor CT1, the configuration is such that output voltage VOUT equals boosted voltage VBULK times (NS divided by NP).

The invention relates to a switch machine driving system, and relates to the technical field of rail transit, and a switch machine drives a turnout to switch positions through rotation in a positioning or reverse direction; the point switch outputs state information and fault information to the driving system; the switch machine driving system comprises a control module and a turnout position representation module, wherein the turnout position representation module comprises a positioning acquisition circuit and an anti-position acquisition circuit; the positioning acquisition circuit comprises a first positioning acquisition branch and a second positioning acquisition branch which are connected in parallel, the anti-position acquisition circuit comprises a first anti-position acquisition branch and a second anti-position acquisition branch which are connected in parallel, and all the acquisition branches are provided with rectifier diodes; the positioning acquisition circuit and the anti-position acquisition circuit acquire voltage signals output by the point switch, and the control module is connected with the positioning acquisition circuit and the anti-position acquisition circuit to acquire the state and fault information of the point switch. According to the switch machine driving system, the reliability of the system is enhanced in the mode that the state of the switch machine is collected through multiple paths of signals.

The utility model provides a single-stage bridgeless conversion device integrated with a Buck-Boost circuit and an AHB flyback circuit. The single-stage bridgeless conversion device is characterized by comprising a bridgeless Buck-Boost circuit and an AHB flyback circuit, the Buck-Boost circuit comprises three switching tubes Q1, Q2 and Q3, and one of the switching tubes Q3 is multiplexed as an upper tube of the AHB flyback circuit. According to the single-stage bridgeless conversion device integrated with the Buck-Boost and AHB flyback circuits, the voltage stress of the switch tube Q3 can be obviously reduced, and the stress of the added switch tubes Q1 and Q2 is equal to the input voltage, so that the type selection of the switch tubes is more favorable, a 500V switch tube with high cost performance can be selected, two power diodes are reduced in a main loop, and the cost performance of the main loop is improved. Therefore, the cost of the power semiconductor device can be reduced. Meanwhile, the working principle of the AHB flyback circuit part is completely the same as that of a conventional AHB flyback circuit, Q3 and Q4 can realize ZVS in a full-load range, a secondary side rectifier diode realizes ZCS, the gain change range is large, and wide voltage input and output can be realized.

The invention discloses a high-voltage high-power cascade converter which comprises rectifier diodes, a direct-current input bar, an IGBT device, a low-inductance busbar, a cascade output bar, a radiator, a cover plate, a shell assembly and a control assembly. The fuse and the supporting capacitor are detachably connected with the converter through the low-inductance busbar. The radiator is located at the bottom of the shell assembly, a cooling medium connector is arranged on the side portion of the radiator, and the cover plate is used for sealing the top of the shell assembly. The plurality of rectifier diodes and the plurality of IGBT devices are installed on the radiator, and the low-inductance busbar is used for connecting terminals of corresponding polarities of the rectifier diodes and the IGBT devices; the direct current input bar and the cascade output bar are both located above the IGBT device and are arranged in a staggered manner; the DC input bar is connected with the support capacitor through the low-inductance busbar. The cascade output bar adopts a copper bar mode; the control assembly is located above the cascade output row. The invention has the advantages of compact structure, convenience in maintenance, high power and the like.

This disclosure presents an embodiment of a power supply device for a submarine data center. One specific embodiment of the power supply device includes a pre-stage voltage regulator / conversion component, a post-stage DC-DC converter component, and a combined protection circuit. The pre-stage voltage regulator / conversion component includes several parallel single-group voltage regulator branches, each branch connected in series with a varistor and a color-coded resistor. A thin-film capacitor is connected in parallel to the output terminal of the pre-stage voltage regulator / conversion component. The post-stage DC-DC converter component, electrically connected to the pre-stage voltage regulator / conversion component, includes at least two sets of full-bridge DC synchronous rectifier circuits. The combined protection circuit includes a pre-stage combined protection circuit, a post-stage active voltage clamping circuit connected in parallel to the output side of the post-stage DC-DC converter component, and a rectifier diode bridge connected between the constant current input port and the pre-stage voltage regulator / conversion component. The pre-stage combined protection circuit is connected in series to the input side of the rectifier diode bridge. By connecting multiple voltage regulator branches in parallel and combining them with the combined protection circuit, ripple is reduced. This embodiment can improve the power supply stability of the power supply device.

This invention provides a switching power supply, an AC-DC circuit, an input voltage detection circuit, and a method. The first end of the secondary coil of a transformer is connected to the anode of a rectifier diode, and the cathode of the rectifier diode is connected to the positive terminal of a filter capacitor. The second end of the secondary coil of the transformer, the negative terminal of the filter capacitor, and the positive terminal of the sampling capacitor are all grounded. The cathode of the diode is connected to the first end of the secondary coil of the transformer, and the anode is connected to the negative terminal of the sampling capacitor. The negative terminal of the sampling capacitor is grounded sequentially through a third sampling resistor and a second sampling resistor. The common terminal of the third and second sampling resistors is connected to a voltage detection terminal and, through a first sampling resistor, to a reference voltage input terminal. A reference voltage is input to the reference voltage input terminal. The control unit detects the voltage at the voltage detection terminal and calculates the magnitude of the input AC voltage based on the relationship between the AC voltage and the voltage at the voltage detection terminal.

The invention discloses an integrated rectifier diode module of a three-dimensional spiral structure, and relates to the technical field of power semiconductor devices, the integrated rectifier diode module of the three-dimensional spiral structure comprises an electrical function unit and a thermal management unit which are integrated in a monolithic mode, and the electrical function unit and the thermal management unit are coaxially arranged to achieve electric-thermal collaborative optimization. The specific structure is as follows: the electrical function unit comprises a substrate layer, an N + GaN conduction layer, an N-GaN drift layer and a three-dimensional spiral super-junction structure embedded in the N-GaN drift layer, the substrate layer, the N + GaN conduction layer, the N-GaN drift layer and the three-dimensional spiral super-junction structure are sequentially stacked from bottom to top, the three-dimensional spiral super-junction structure is formed by alternately and spirally arranging P-NiO regions and N-GaN regions, and charge balance is achieved; the electrical function unit further comprises an anode electrode and a cathode electrode, the anode electrode is arranged at the top of the three-dimensional spiral super-junction structure, and the cathode electrode is arranged on the surface of the N + GaN conduction layer; according to the invention, the power density is improved, the high-power application requirement is met, the device is suitable for the high-power-density field, the environmental adaptability is high, and the stable performance can be kept at different working temperatures.

The utility model discloses a secondary overlapped multi-group series rectification output circuit of a switching power supply. The secondary overlapped multi-group series rectification output circuit comprises a transformer and at least three series rectification circuits electrically connected with the transformer, each rectification circuit comprises a rectification diode, an RC absorption circuit, a capacitor filter circuit and a dummy load circuit; the transformer is provided with at least three secondary windings; the corresponding end of the rectifier diode is electrically connected with the corresponding ends of the secondary winding of the transformer, the RC absorption circuit, the capacitor filter circuit and the dummy load circuit respectively; wherein the rectifier diode is used for converting alternating current on the secondary winding side of the transformer into direct current; the RC absorption circuit is used for absorbing a backward voltage peak of the rectifier diode; the capacitor filter circuit is used for smoothing the output voltage; and the dummy load circuit is used for stabilizing the output voltage under a low load condition. According to the utility model, the problems of high withstand voltage and EMC of the rectifier diode are effectively solved.

The invention relates to the technical field of switching power supply circuits, in particular to a BOOST switching power supply circuit applied to a high step-up ratio. The BOOST switching power supply circuit applied to the high step-up ratio comprises an input filtering module, a first-stage step-up module, a second-stage step-up module and a control module, the input filtering module comprises an input capacitor Cin and is used for filtering an input voltage Vin; the first-stage boost module comprises a boost inductor L1, a switch tube MOS Q2, a rectifier diode D1 and an output capacitor Co1. The boost circuit is composed of an input capacitor Cin, a boost inductor L1, a switch tube MOS Q1, a switch tube MOS Q2, boost rectifier diodes D1 and D2, output capacitors Co1 and Co2 and a control chip U1, one chip is used for controlling a two-stage BOOST boost circuit, control is simple, the number of parts is small, large-current output and high-step-up-ratio boost can be achieved, and in a power supply circuit using a low-voltage battery or a solar rechargeable battery product, the boost circuit can be applied to a power supply circuit. And the use value is high.

An insulation and voltage resistance detection circuit comprises an input port which is connected with a rectifier diode through a resistance network and is used for carrying out current limiting and voltage dividing processing on an input signal; the rectifying circuit is used for carrying out full-wave rectification on an input signal by utilizing a plurality of diodes and outputting stable direct-current voltage; the filter circuit comprises a plurality of filter capacitors and is used for carrying out smooth filtering on the rectified direct-current voltage and providing stable output voltage; the optical coupler U1 is used for realizing electrical isolation between an input signal and an output power supply and avoiding high-voltage or noise conduction; the current limiting circuit comprises a current limiting resistor and is used for controlling the current passing through the optocoupler or the LED and protecting the device; by introducing a multi-stage resistor current limiting circuit, a diode rectification circuit, a filter capacitor circuit and an optical coupler isolation circuit, efficient power supply control is realized.

The invention discloses a wide dynamic range rectifier based on an automatic power distribution mechanism. The wide dynamic range rectifier comprises a high-power sub-rectifier and a low-power sub-rectifier, the high-power sub-rectifier comprises a high-power rectification trunk and a high-power rectification branch; the low-power sub-rectifier comprises a low-power rectification trunk and a low-power rectification branch; through the synergistic effect of a threshold switch control circuit and a tunable matching network arranged in a low-power rectification branch, the low-power rectification branch provides inductive impedance in a low-power state to compensate the inherent capacitive impedance of a low-power rectification diode, and presents a high-impedance state in a high-power state to turn off a low-power sub-rectifier. Therefore, the adverse effect of the low-power sub-rectifiers on the high-power sub-rectifiers is avoided while high-efficiency energy conversion in the low-power interval is ensured, and the overall rectification efficiency in the high-input power interval is remarkably improved.

The invention relates to the technical field of electric appliance control circuits, and discloses a non-isolated zero-crossing detection and commercial power voltage detection multiplexing low-cost simple circuit, which comprises a rectifier diode D3301 of which the cathode is connected with a live wire of a commercial power input end, and the anode is connected with a first resistor R3301; the first resistor R3301, the second resistor R3302 and the third resistor R3303 are connected in series. Through a sampling link formed by a rectifier diode D3301 and series voltage dropping resistors R3301, R3302 and R3303, a zero-cross detection signal is provided for an interruption input end VT at the same time, and a voltage detection signal is provided for an analog input end AD through a divider resistor R3304 and a filter capacitor C3301, so that multiplexing of two types of detection is realized under a non-isolation structure, commercial power detection can be completed without an optocoupler or an isolation transformer, and the detection efficiency is improved. Therefore, devices are reduced and circuits are simplified.

The invention discloses a rectifier-diode-free single-inductor boost energy recovery circuit and a control method thereof, and relates to the technical field of electric energy conversion circuits. The circuit topology comprises a switching tube S1, a switching tube S2, an inductor L, a diode D1, a diode D2 and an output capacitor Co. One end of the alternating current input side is connected with the drain electrode of the switching tube S1, the positive electrode of the output capacitor Co and one end of the load RL; the source electrode of the switching tube S1 is connected with one end of the inductor L and the cathode of the diode D1; the negative electrode of the output capacitor Co is connected with the positive electrode of the diode D1, the other end of the load RL and the positive electrode of the diode D2; the other end of the AC input side is connected with the drain electrode of the switch tube S2, and the source electrode of the switch tube S2 is connected with the other end of the inductor L and the cathode of the diode D2. According to the rectifier-diode-free single-inductor boost energy recovery circuit, by completely eliminating a diode rectifier bridge, energy loss is reduced, and the circuit structure is simplified.

This invention relates to a circuit board for an ozone generator with frequency tracking functionality. The circuit board includes a frequency tracking circuit comprising an RC oscillation unit, an LC resonant unit, a current sampling unit, a comparison control unit, a voltage divider bias unit, and a frequency limiting protection unit. The LC resonant unit includes a resonant inductor T1 and a resonant capacitor C1, used to drive the ozone sensor. The current sampling unit includes a sampling resistor R8 connected in series in the LC resonant circuit, used to acquire the circuit current signal. The comparison control unit includes a comparator U1, a transistor Q1, a rectifier diode D2, and a filter capacitor C3. The voltage signal from the sampling resistor R8 is rectified by D2 and filtered by C3 before being input to the inverting input of U1. The voltage divider bias unit includes resistors R3 and R6. The RC oscillation unit is connected to the transistor Q1. This invention can adapt to capacitance changes during ozone sensor power-on and operation, automatically tracking the frequency and achieving resonance, while ensuring stable output power, extending device lifespan, and improving ozone generation efficiency and overall reliability.

The utility model belongs to the technical field of semiconductors, and particularly relates to a vehicle rectifier diode. The utility model comprises: a crystal grain; the lead wire is arranged above the crystal grain; the copper particles are arranged below the crystal grains; the packaging body is arranged on the outer layer of the crystal grain and partially wraps the lead and the copper particles; the top surface of the copper base is provided with a recess, the packaging body and the copper particle are recessed in the recess, and the copper particle is welded with the top surface of the recess through a soldering lug; and a circle of fixing teeth are arranged on the peripheral surface of the copper base. The utility model is used for solving the technical problems that the production time is long and matched welding equipment is needed because the existing bump diode needs to be welded in the use process.

The invention relates to an intelligent window power supply control system based on photovoltaic driving, which comprises a main power supply circuit, a standby power supply circuit and a load circuit, and is characterized in that the main power supply circuit comprises a photocell pack, a storage battery pack, a combined socket and a contactor, and the standby power supply circuit comprises a frequently-used power supply, a terminal strip, a fuse, a contact switch, an AC / DC converter and a rectifier diode; the load circuit and the AC / DC converter are arranged in parallel, the load circuit comprises a motor and a solid-state relay, power storage is provided for the storage battery pack through the photocell pack, natural resources are reasonably utilized, and the power consumption cost is saved; a load circuit is assembled on the standby power supply circuit, so that the problems that a power supply is easily influenced by weather factors, so that the circuit is unstable, and an intelligent window system based on photovoltaic driving is easily damaged are solved; the green power connection head of the first combined socket and the green power connection head of the second combined socket are connected with the storage battery pack in parallel and are arranged in a vacant mode, multiple groups of load circuits can be loaded in parallel, and each group of circuit works independently and does not influence each other.

The utility model provides a zero cross detection circuit of an AC PTC heater, the detection circuit comprises a photoelectric coupler module and a rectifier module, the rectifier module comprises a plurality of rectifier diodes, the photoelectric coupler module comprises a photoelectric coupler and a pull-up voltage source, one side of the rectifier module is also connected with an AC power supply, and the other side of the rectifier module is connected with a power supply. And one side of the photoelectric coupler module is also connected with the MCU. The rectification module converts input alternating current into one-way pulsating direct current and transmits the one-way pulsating direct current to the photoelectric coupler module, a photoelectric coupler detects rectified voltage, if the amplitude of the rectified voltage is larger than 0, the photoelectric coupler is kept in a conducting state, and the MCU detects that the input is low level; and if the voltage amplitude after rectification is 0, namely the alternating current input amplitude is 0, namely the alternating current is reversed, the photoelectric coupler is cut off, and the MCU detects that the voltage input is a high level. The zero-crossing detection circuit can quickly judge the zero-crossing moment of the alternating-current input voltage of the alternating-current PTC heater and feed back information to the MCU so as to realize accurate control of the alternating-current PTC heater.

The present invention provides a topology circuit for a converter with a wide voltage range, characterized in that the specific structure includes: a half-bridge drive circuit and a QR control circuit; the half-bridge drive circuit includes a first transistor (Q1), a second transistor (Q2), a first DC blocking capacitor (C1), a second DC blocking capacitor (C2), a main transformer (T1), a first secondary-side rectifier diode (D2), a second secondary-side rectifier diode (D3), an energy storage inductor (L1), and a smoothing capacitor (C4); the QR control circuit includes a control chip (U1), the control chip U1 is connected to the half-bridge drive circuit and is externally connected to a measurement chip (U2). The topology circuit for a converter with a wide voltage range of the present invention can achieve the ability of ZVS soft switching while adjusting the wide voltage range, thereby improving the application range of the converter and expanding the adaptability of the topology circuit in applications.

The invention relates to an equalization circuit with a plurality of serially connected lithium battery packs, which is characterized in that the cathode of each lithium battery pack is connected with the cathode of a voltage sampling unit, the cathode of a capacitor C3 and the cathode of a winding L1, and the anode of the lithium battery pack 1 is connected with the anode of a diode of an optocoupler G1 and an optocoupler G2, the anode of the voltage sampling unit, the anode of the capacitor C3 and the cathode of a rectifier diode D1; the anode of the rectifier diode D1 is connected with the positive electrode of the winding L1, the cathodes of the diodes of the optocouplers G1 and G2 are connected with the two enabling ends of the voltage sampling unit, the positive end and the negative end of a power supply of the balance driving unit are connected with the negative end and the positive end of a voltage stabilizing diode D5 in the voltage division circuit in parallel, and the output end of the balance driving unit 31 is connected with the grid electrode of the field effect transistor T1. According to the lithium battery pack capacity balancing circuit, the problem of capacity difference existing between the lithium battery packs connected in series is effectively solved, the voltage between the lithium battery packs can be balanced, and the capacity of the lithium battery packs can be fully utilized.

The invention discloses a PN-junction-free magnetic control one-way conduction rectifying device, aims to solve the technical problem of reducing the loss of the rectifying device, and adopts the following technical scheme that the PN-junction-free magnetic control one-way conduction rectifying device is provided with an N-type semiconductor silicon wafer, the N-type semiconductor silicon wafer is divided into three areas along the Z-axis direction: a low-resistance area, a transition area and a high-resistance area, compared with the prior art, an N-type semiconductor is divided into a high resistance area and a low resistance area to replace a traditional PN junction type diode, a manufactured rectifying device with a one-way conduction function abandons PN junctions on a main current loop, and therefore the rectifying diode does not have PN junction loss. The design of the power supply circuit does not have the scurf of a rectification part, PN junction loss, complexity of a synchronous rectification circuit and heat dissipation are not considered, the cost is reduced, the size is reduced, and the conversion efficiency of the power supply is greatly improved while the circuit is simplified.

The utility model particularly relates to a pulse igniter high-voltage discharge monitoring device which comprises a high-voltage discharge needle IG, an inductance coil L1 is arranged on a wire of the high-voltage discharge needle IG, an A end of the inductance coil L1 is connected with a first rectifier diode D1, a B end of the inductance coil L1 is connected with a first resistor R1, the other end of a second resistor R2 is respectively connected with a third diode D3 and a signal output port IG-TEST end, and the other end of the third diode D3 is connected with a second rectifier diode D1. The other end of the third diode D3 is connected with a power supply end VCC, the high-voltage spray point IG is further connected with a pulse igniter, the pulse igniter is further connected with a control panel, the control panel is further connected with a relay switch JD, and one end of the relay switch JD is connected with an alternating current power supply VS. The beneficial effects of the utility model are that the inductance coil L1 detects the voltage value of the high-voltage discharge needle IG, and the voltage value is fed back to the control panel through the signal detection port IG-TEST end, so that the pulse igniter and the electromagnetic gas valve are in a disconnected state, and the advantages of discharge monitoring and safety improvement can be achieved.

The application provides a three-phase LLC resonant converter with an ultra-wide voltage regulating range, comprising a DC input power supply, seven power switching tubes, three resonant inductors, three resonant capacitors, three transformers and their three equivalent excitation inductors, twelve rectifier diodes and an output filter capacitor; the seven power switching tubes form a three-phase bridge inverter circuit; the three resonant inductors, the resonant capacitors and the excitation inductors form three-phase resonant tanks which are connected in a triangle; the three secondary winding of the three transformers are connected to three series H-bridge rectifiers formed by the twelve diodes, and then are connected in parallel with the output filter capacitor and the load; the application has the advantages of providing a three-phase LLC resonant converter with the advantages of large power, high efficiency, narrow working frequency range, ultra-wide output voltage range, ultra-small output current ripple and ultra-small standby power loss, and is widely applied to electric vehicle charging piles and other charging power supplies which require large power and ultra-wide output voltage range.

This utility model discloses a power supply circuit for a rail transit lighting system, wherein the anode of the anti-reverse diode D2 is connected to the DC power input terminal V. in The cathode is connected in series with fuse F1, then splits into two paths. The first path connects to the input pin VIN of the high-voltage linear regulator U1, and the second path is grounded through rectifier diode D1 and then connected in parallel with input filter capacitor C2. The input pin VIN of U1 is connected to the positive terminal of C2, the output pin OUT of U1 is grounded through the output filter capacitor C1, and the adjustment pin ADJ of U1 is grounded through resistor R6. The base of transistor Q2 is grounded through resistor R6, and the base is also connected to the output pin OUT of U1 through resistor R2. The collector is connected to the input pin VIN of U1, and the emitter of Q2 is directly connected to the power output terminal V. out Simultaneously, the adjustment pin ADJ of U1 is connected via resistor R4. Through the above method, the power supply circuit for the rail transit lighting system of this utility model adopts the TL783CKCSE3 high-voltage linear regulator, which supports wide voltage input and high voltage differential drop, effectively coping with fluctuations in the rail transit power grid and ensuring stable operation of the lighting system.

The invention discloses a rectification antenna module and electronic equipment, and belongs to the technical field of communication. The rectification antenna module comprises a communication antenna array, a rectification module, a first dielectric plate, a second dielectric plate, a grounding layer, a feed module and a DC filtering module. The communication antenna array and the rectifier module are arranged on two opposite sides of the first dielectric plate, and the second dielectric plate is clamped between the rectifier module and the grounding layer; the communication antenna array comprises n antenna units, and each antenna unit is electrically connected with the feed module; the rectifier module comprises m first electromagnetic metasurface units, p second electromagnetic metasurface units and x rectifier diodes; the first electromagnetic metasurface units and the second electromagnetic metasurface units are arranged alternately, and any two adjacent first electromagnetic metasurface units and second electromagnetic metasurface units are electrically connected through a rectifier diode; a grounding point on the first electromagnetic metasurface unit is electrically connected with the grounding layer; the DC filtering module is electrically connected with the rectification module.

The application discloses a high-voltage direct-current converter topology and a control method thereof, and belongs to the technical field of power generation, power transformation or power distribution. The topology is composed of a high-voltage side filter inductor, a three-phase MMC inverter circuit, a three-phase leakage inductor, a three-phase transformer, a three-phase diode rectifier circuit, a medium-voltage side filter inductor and a medium-voltage side filter capacitor. The topology structure of the application can realize higher reliability, lower cost and smaller size by the relatively mature high-voltage side modular structure and the medium-voltage side diode series connection technology. By precisely controlling the three-phase current to be a positive-negative half-cycle symmetrical trapezoidal current, reliable commutation of the three-phase rectifier diode is realized, and meanwhile, smooth direct-current is synthesized on the high-voltage side and the medium-voltage side, so that the operation efficiency of the converter and the port power quality are significantly improved, and the filter size is reduced.

The utility model provides a multi-battery pack equalization circuit and a battery pack series-parallel equalization system. The multi-battery pack equalization circuit comprises a plurality of equalization sub-circuits, each equalization sub-circuit comprises a battery cell module, an equalization transformer, a primary side electronic switch tube, an equalization positive end switch, an equalization negative end switch, an output rectifier diode and an output capacitor, and the plurality of battery packs are connected in series and / or in parallel; the first end of the secondary side of the equalization transformer is connected with the anode of the output rectifier diode, and the cathode of the output rectifier diode is connected with the first end of the output capacitor. As the equalization loop is separated from the external charging and discharging loop of the battery cell module, the battery cell modules which are mutually equalized can be equalized no matter in a standing state or a charging and discharging state, and the battery cell equalization circuit has the advantages of high equalization efficiency and good flexibility.

The utility model provides an electromagnetic valve power-saving loop which comprises a first rectifier diode, the positive electrode of the first rectifier diode is connected with 24V, the negative electrode of the first rectifier diode is provided with an adjusting switch, the negative electrode of the first rectifier diode is connected with the positive electrode of a light-emitting diode, and the negative electrode of the light-emitting diode is connected with the collector electrode of a first triode. The cathode of the first rectifier diode is connected with the base electrode of the first triode, the emitter electrode of the first triode is connected with the grid electrode of the field effect transistor, the emitter electrode of the first triode is connected with the anode of the second rectifier diode, the cathode of the first rectifier diode is connected with the drain electrode of the field effect transistor, and the source electrode of the field effect transistor is connected with the anode of the second rectifier diode; the circuit design of the electromagnetic valve is optimized, the triode is combined with the field effect transistor, the working current of the electromagnetic valve coil is reduced and controlled, the energy consumption of the electromagnetic valve during working is reduced, and the purpose of saving energy is achieved.

The invention discloses a single-stage two-switch electrolytic capacitor-free LED drive circuit, which comprises an electrolytic capacitor-free LED drive circuit, the LED drive circuit without the electrolytic capacitor comprises an input voltage Vin, an input rectifier diode VDr1, an input rectifier diode VDr2, an input rectifier diode VDr3, an input rectifier diode VDr4, a transformer Tr, a switch tube Q1, a secondary side freewheel diode VDo, an output capacitor Co, an energy storage element Ca, a switch tube Q2, an auxiliary diode VDs, an inductor L1 and an inductor L2. According to the circuit, the flyback converter and the auxiliary energy storage circuit are highly integrated in a switching tube sharing mode, switching devices are reduced, the circuit structure is simple, charging and discharging balance of an energy storage capacitor is achieved by controlling the time of simultaneous switching-on and simultaneous switching-off of the two switching tubes, low-frequency ripples of output current are restrained, and the output current is improved. The auxiliary energy storage circuit absorbs leakage inductance energy and reduces the voltage amplitude at the drain end and the source end of the switch tube, so that the voltage stress of the switch tube is reduced.

The present invention relates to the field of electromagnetic compatibility and discloses a simplified circuit design method and system for a high-performance EMC suppression rectifier diode. The method comprises: identifying the interference frequency range of the diode application scenario, determining the passive and active components of the diode application scenario, and establishing a passive filter for the diode application scenario; establishing an active filter for the diode application scenario, combining the passive and active filters to obtain a multi-stage filter; establishing a protection circuit for the multi-stage filter and the target rectifier diode, and constructing a diode integrated circuit comprising the protection circuit, the multi-stage filter, and the target rectifier diode; simulating the diode integrated circuit to obtain EMC suppression data, calculating circuit parameter values ​​of the diode integrated circuit, and performing circuit optimization of the diode integrated circuit to obtain the target integrated circuit. The present invention can improve the EMC suppression effect of the rectifier diode.