102 results about "Full bridge inverter" patented technology

The invention discloses a single-phase voltage stabilizing device and a control method and system thereof. Compared with a traditional single-phase full-bridge PWM rectifier and a single-phase full-bridge inverter, the single-phase voltage stabilizing device has the advantages that one bridge arm is reduced, the device cost is lower, fewer devices are needed, fault nodes are correspondingly reduced, and the reliability is higher. The problem of control coupling of a grid-connected input side and an inverter output side is caused due to the fact that one bridge arm is shared, the inverter output side voltage is given to be associated with a grid side, the phases of the inverter output side voltage and the grid side are synchronized, then pulses of the shared bridge arm are naturally decoupled, and the output sinusoidal voltage is obtained. Meanwhile, due to the full-bridge PWM rectification control mode adopted by the grid-connected input side, the grid-side power factor can be 1, and the grid-side current is sinusoidal, so that green grid connection of the device is realized; the inverter output side tracks the network side voltage and introduces the direct current bus voltage as negative feedback, so that the stability of the output voltage is ensured, the stable single-phase voltage output is finally obtained, and the quality of the power supply electric energy in the substation is improved.

The invention relates to a flexible loop closing device and a flexible loop closing method. The flexible loop closing device is arranged between a first power distribution network and a second power distribution network, and comprises a three-phase full-bridge inverter and a three-phase transformer, the three-phase output end of the three-phase full-bridge inverter is connected with the primary side of the three-phase transformer. The secondary side of the three-phase transformer is connected with a control switch, and each control switch is connected in series between the first power distribution network and the second power distribution network; and the flexible loop closing device controls the control switch to be closed under the condition that the actual output voltage of the flexible loop closing device meets a preset condition, so that flexible loop closing of the first power distribution network and the second power distribution network is realized. By adopting the device, the switch can be controlled to be switched on under the condition that the actual output voltage of the flexible loop closing device meets the preset condition, at the moment, flexible loop closing of the first power distribution network and the second power distribution network is achieved, and large impact current generated by direct loop closing is restrained.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

The application discloses a single-stage three-phase high-frequency isolation type conversion circuit and a closed-loop control method. The single-stage three-phase high-frequency isolation type conversion circuit generates a modulation ratio and a vector angle on the basis of synchronous control of a fundamental wave and a harmonic wave of a three-phase current based on three-phase voltage of a three-phase three-wire power grid and the three-phase current of the three-phase three-wire power grid, generates a primary side driving signal and a secondary side driving signal according to the modulation ratio and the vector angle, the primary side driving signal is used for driving a three-phase matrix converter, and the secondary side driving signal is used for driving a full-bridge inverter. The fundamental wave and the low-frequency harmonic wave of the power grid current can be synchronously controlled, low-order harmonics can be eliminated, the sinusoidal degree of the grid-connected current can be improved, and thus the quality of the power grid current and total harmonic distortion can be improved.

The invention discloses a DCAC power conversion device and a power conversion method thereof, and the device comprises a full-bridge inverter which is used for converting an input DC voltage into a high-frequency AC voltage; the LCL resonance network is connected to the output end of the full-bridge inverter and is used for being equivalent to a current source in a target frequency range to realize zero voltage switching ZVS and harmonic suppression; the primary side of the high-frequency isolation transformer is connected with the LCL resonance network, and the secondary side of the high-frequency isolation transformer is connected with a load to realize electrical isolation of input and output; and the load phase angle detection module is used for detecting current and voltage signals of a load in real time, calculating a load phase angle # imgabs0 # hybrid control unit and dynamically switching control modes according to the numerical relationship between the load phase angle # imgabs1 # and a preset threshold # imgabs2 # so as to control the output current, and the control modes comprise pulse frequency modulation (PFM) and phase shift pulse width modulation (PS-PWM). According to the device and the method, through the cooperative operation of the LCL resonance network and the hybrid control unit, the problems of large switching loss, low constant current precision and difficulty in EMI suppression in high-frequency application are solved.

The application discloses a wireless charging circuit for a UAV, a movable electric energy carrier and the UAV. The circuit comprises an electric energy transmitting sub-circuit and an electric energy receiving sub-circuit, the electric energy carrier is configured to perform wireless charging on a power supply of the UAV through electric energy transmission between the electric energy transmitting sub-circuit and the electric energy receiving sub-circuit; the electric energy transmitting sub-circuit comprises a boost converter and a full-bridge inverter to control the operation efficiency of the wireless charging circuit; and the electric energy receiving sub-circuit comprises a receiving switch tube and a receiving diode arranged in series to control the wireless charging circuit to output electric energy at a constant voltage or a constant current to the power supply. The application can switch and adjust the charging mode for the UAV based on the control of the PWM signal on the basis of using the electric energy carrier to perform wireless charging on the UAV in real time, can maximize the operation efficiency of the whole wireless charging circuit and reduce the control complexity of the wireless charging circuit.

The invention provides a control method, a storage medium, a full-bridge inverter and electronic equipment, and the control method is applied to the full-bridge inverter, and comprises the steps: controlling the full-bridge inverter based on a triangular wave mode of an inductive current; a compensation current value is obtained, wherein the compensation current value is a negative current increment caused by full-bridge inverter inductive current falling edge sampling calculation delay; and compensating a preset extreme value of the inductive current of the full-bridge inverter based on the compensation current value. According to the control method provided by the embodiment of the invention, the compensation current is obtained based on the negative current increment caused by the full-bridge inverter inductive current falling edge sampling calculation delay, the preset extreme value of the inductive current is compensated, the negative current influence caused by the inductive current falling edge sampling calculation delay is counteracted, and the inverter efficiency and the current quality are improved.

The application discloses a foreign matter detection circuit applied to a wireless charging system transmitting end and a method thereof, and the circuit comprises a sampling circuit, a linear voltage stabilizing source, two comparators and a microprocessor; wherein the linear voltage stabilizing source is responsible for charging a resonant cavity circuit, the sampling circuit samples a resonant waveform, filters out a negative voltage and outputs the same to the comparators, the comparators extract resonant frequency, resonant time and peak value information, and the microprocessor calculates a Q value through the information and performs foreign matter detection judgment. The application can not be affected by a specific structure resonant cavity, a delay of a wireless charging system transmitting end full-bridge inverter driving circuit and a comparator offset voltage in the foreign matter detection circuit, and can realize extremely high foreign matter Q value detection precision under a higher resonant frequency, and has important significance for improving a safety coefficient of wireless charging system application.

The utility model discloses a multi-system amplitude shift keying modulation energy and signal synchronous transmission system, which comprises a direct current source, an inverter, an energy transmission topological structure, a load, a demodulation circuit and a digital signal processor (DSP) chip, the direct current source is electrically connected with the energy transmission topological structure through the inverter, the energy transmission topological structure is connected with the load, and the load is connected with the demodulation circuit. The energy transmission topological structure is electrically connected with the DSP chip through the demodulation circuit, in the multi-system amplitude shift keying modulation energy and signal synchronous transmission system, a pre-transmission modulation signal generates a PWM variable through the DSP, the PWM variable is directly superposed to a control end of an MOSEFT tube in a full-bridge inverter, and the PWM variable is converted into a PWM variable through the DSP. The phase shift angle of the inverter is controlled through the control circuit, so that the voltage amplitude is changed, M kinds of amplitude transformation are generated, energy and signals are transmitted to the receiving coil through the transmitting coil at the same time, the energy is transmitted to a load through a circuit, and the signals are restored through the current Hall sensor, the demodulation circuit and the DSP.

A non-isolated converter includes a transformer having a primary winding and a secondary winding, a primary-side inverter, a secondary-side rectifier, and an output filter. The primary-side inverter is a full-bridge inverter providing two conduction paths for primary current during ON intervals of a switching cycle. The conduction paths are connected at a low-side common connection directly connected to the output side of the secondary winding, to provide the converter output current as the sum of the primary current and the secondary current during the ON intervals. Because the converter output includes a contribution from primary-side current due to the direct connection, certain advantages may be realized such as reduced primary-winding area / losses and reduced losses in the secondary-side rectifier.

This invention discloses a strip-shaped embedded micro grid-connected inverter at the edge of a photovoltaic panel, comprising a matching strip-shaped housing and internal circuitry. The strip-shaped housing is embedded within the metal frame of a single photovoltaic panel. The internal circuitry sequentially includes a PV-end filter, an isolated non-resonant high-frequency boost DC-DC converter, a full-bridge inverter, and a grid-connected filter. It employs a non-resonant linear soft-switching topology, configured to enable all internal switches to achieve non-resonant zero-current soft-conduction and all diodes to achieve non-resonant zero-current soft-turn-off. This invention discloses a strip-shaped embedded micro grid-connected inverter at the edge of a photovoltaic panel, achieving deep integration with the photovoltaic panel frame through a strip-shaped structure design and utilizing the linear variation characteristic of transformer leakage inductance current to achieve non-resonant linear soft-switching across the entire power range.

The invention discloses a detection-free zero-voltage switching-on method based on a full-bridge inverter intermittent current mode, and relates to a power electronic converter. The micro inverter works in an inductive current intermittent conduction mode, zero-voltage switching-on of a switching tube can be realized on the basis of not adding any additional device and auxiliary circuit, and the efficiency of the inverter is effectively improved. The traditional scheme generally depends on a sampling circuit to detect a resonance current zero crossing point between an inductor and a switch tube shunt capacitor to determine the turn-on time, so that the hardware complexity is increased, and the zero-voltage turn-on effect depends on the reliability of a detection circuit. And when the switching frequency is relatively high, the inherent delay characteristic of the sampling circuit can limit the zero-voltage switching-on realization effect. The invention provides a zero-voltage turn-on moment determination strategy based on inverter behavior modeling in an intermittent conduction mode, a detection circuit is not needed, and the zero-voltage turn-on moment can be accurately determined only through discrete time control by a controller after modeling, so that full-period soft switching is realized, and the hardware complexity is reduced.

The invention discloses a method and a system for controlling a network-forming converter based on direct-current voltage synchronization, and belongs to the field of power electronic converter control. In order to overcome the defects that a traditional grid-following type converter does not have the grid-building capacity, depends on a constant direct current source and needs to be provided with energy storage, and existing related patents, the system comprises a three-phase full-bridge inverter, a grid-building type converter control system and a sensor. The method comprises the following steps of: acquiring direct-current voltage Udc, terminal voltage utabc and output current iabc of the converter, generating a coordinate transformation angle theta c through a direct-current voltage controller, performing coordinate transformation and alternating-current voltage / current double-closed-loop control, generating a modulation signal in combination with coordinate inverse transformation and a PWM (Pulse-Width Modulation) generator, and controlling a power switch device. The method breaks through the dependence of a constant direct current source, reduces the cost, can support the voltage and frequency of a power grid, is high in anti-interference capability, and improves the universality and stability of a converter grid-connected system.

The disclosure relates to a fifth-generation (5G) or pre-5G communication system to support a higher data transmission rate beyond that of a fourth-generation (4G) communication system, such as Long-Term Evolution (LTE). According to embodiments of the disclosure. An apparatus and method in a wireless communication system are provided. The apparatus includes a full-bridge inverter configured to convert an input first direct current (DC) signal into a first alternating current (AC) signal, a plurality of multilayer ceramic capacitors (MLCCs) configured to isolate the first AC signal output from the full-bridge inverter to output a second AC signal, and a full-bridge rectifier configured to convert the second AC signal output from the plurality of MLCCs into a second DC signal. The plurality of MLCCs isolate the full-bridge inverter from the full-bridge rectifier, an inductor is connected to one end of each of the plurality of MLCCs, and an operating frequency of the first AC signal corresponds to a resonant frequency.

Provided is a power conversion apparatus including an input circuit generating an input voltage, a buck-boost converter connected to the input circuit, a first full-bridge inverter and a second full-bridge inverter, which are connected to the buck-boost converter, at least one first inductor connected to the first full-bridge inverter, at least one second inductor connected to the second full-bridge inverter, an output circuit connected to the at least one first inductor and the at least one second inductor to generate an alternating current output voltage, and at least one processor configured to apply a first carrier signal and a reference signal to the first full-bridge inverter and applying a second carrier signal and the reference signal to the second full-bridge inverter, wherein the first full-bridge inverter operates based on the first carrier signal and the reference signal, and the second full-bridge inverter operates based on the second carrier signal and the reference signal.

The invention belongs to the technical field of voltage-withstanding instrument boosting power supplies, and particularly relates to a full-voltage-range high-performance boosting device and a control method thereof. The device comprises a front-stage electric self-coupling voltage regulator and a rear-stage full-bridge inverter, the front-stage electric self-coupling voltage regulator is associated with the rear-stage full-bridge inverter through a direct-current bus to perform voltage linkage control; the front-stage electric self-coupling voltage regulator is used for realizing alternating current voltage regulation in a range of 0-220V; and the post-stage full-bridge inverter is used for converting the voltage-regulated alternating current into 0-311V variable direct current voltage, and inverting the direct current voltage to obtain the required output voltage. According to the invention, through a cooperative control strategy, full-range high-precision and low-harmonic voltage output from zero to rated voltage can be realized.

Planar power module (200), comprising: a first substrate (40); a second substrate (140) arranged parallel to the first substrate (40), wherein the first substrate (40) and the second substrate (140) each have a dielectric layer (42, 142) arranged between two conductive layers (44A, 44B, 144A, 144B) such that one of the two conductive layers (44B, 144A) of both the first substrate (40) and the second substrate (140) together form parallel outer conductive surfaces (41, 141) of the power module (200); Direct current rails (DC rails) (28); Alternating current busbars (AC busbars) (30); a plurality of semiconductor switching chips (22) arranged between the first substrate (40) and the second substrate (140) and electrically connected to the DC rails (28) and the AC rails (30), each of the semiconductor switching chips (22) being electrically connected to a conductive layer (44B) of the first substrate (40) and a conductive layer (144B) of the second substrate (140); a polymer molding compound (48) surrounding the edges of the first substrate (40), the second substrate (140) and the plurality of semiconductor switching chips (22), wherein the power module (200) is configured as a full-bridge inverter circuit; and at least one temperature sensor (34) connected to one of the two conductive layers (44A, 44B) of the first substrate (40) and / or one of the two conductive layers (144A, 144B) of the second substrate (140); wherein the at least one temperature sensor (34) comprises a first temperature sensor (34) connected to a first of the parallel external conductive surfaces (41, 141) and a second temperature sensor (34) connected to a second of the parallel external conductive surfaces (41, 141).

The present application relates to the technical field of switched reluctance motor control, and specifically relates to a single current sensor control method for a tail topology switched reluctance motor, which comprises the following steps: step one: building a tail topology switched reluctance motor drive system; the system comprises a switched reluctance motor, a direct current power supply, a direct current bus, a single bridge arm, a current sensor, and a three-phase full-bridge inverter; step two: during system operation, the system is controlled as follows: an SVPWM module generates a PWM drive signal for the three-phase full-bridge inverter, and a controller generates a PWM drive signal for the single bridge arm, thereby achieving SVPWM control of the switched reluctance motor; during SVPWM control, the actual three-phase winding current value and the actual neutral point current value are reconstructed according to the direct current bus current value collected by the current sensor. The present application solves the problems of high hardware cost, high wiring complexity, and poor work reliability of the existing tail topology switched reluctance motor SVPWM control method, and is suitable for new energy vehicles, industrial drives, and other fields.

The invention discloses a three-phase single-stage isolation type matrix conversion circuit and a driving method, and the three-phase single-stage isolation type matrix conversion circuit generates a primary side control quantity and a secondary side control quantity based on a grid side electrical parameter and a DC side electrical parameter, and generates a primary side driving signal and a secondary side driving signal based on the primary side control quantity and the secondary side control quantity respectively. The primary side driving signal drives the three-phase matrix converter, and the secondary side driving signal controls the current of the transformer to be the minimum value in the power frequency period through the full-bridge inverter, so that the current of the transformer in the whole power frequency period can be minimized, and the conduction loss of a device and the loss of the transformer are reduced.

The utility model is applicable to the technical field of electronic circuits, and provides an over-current detection and protection circuit applied to a three-phase full-bridge inverter, which comprises a UVW module, the output end of the UVW module is connected with the input end of an optical coupler output module, the output end of the optical coupler output module is respectively connected with the input end of a blocking six-path drive PWM module and the input end of a microprocessor MCU, and the output end of the microprocessor MCU is connected with the output end of the UVW module. The output end of the microprocessor MCU is connected with the input end of the blocking six-path drive PWM module, the output end of the blocking six-path drive PWM module is connected with the input end of the UVW module, and the power supply module is electrically connected with the UVW module, the optocoupler output module, the blocking six-path drive PWM module and the microprocessor MCU. When reliability and double over-current protection are added to the product, the circuit is simplified, the power consumption of the device is small, the packaging is small, the wiring of the functional circuit is convenient, the occupied pcb space is small, the addition is convenient in product optimization, and the size of the product is reduced.

The invention provides an energy and signal simultaneous transmission system and method for underwater equipment with a homologous interference resisting function, and the system is characterized in that a transmitting end is packaged in an underwater base station, and the system comprises a DC voltage source, a full-bridge inverter, a primary side compensation topology circuit and a primary side transmitting coil which are connected in sequence; the receiving end is packaged in an underwater equipment motor cabin section and comprises a secondary side receiving coil, a secondary side compensation topology circuit, a full-bridge rectifier and a load which are connected in sequence; resonance injection-extraction anti-interference circuits designed on the two sides can inject a modulated to-be-transmitted emission information signal into an energy transmission channel, and the modulated to-be-transmitted emission information signal and an energy signal are sent and received at the same time. Receiving information signals and transmitting information signals on the same side can be separated, so that the transmitting information signals on the same side are prevented from interfering with the receiving signals on the side, and the receiving signals are effectively extracted; the simultaneous bidirectional communication of energy and signals is realized, and the signal transmission quality and the energy transmission efficiency are improved.

The invention discloses a series resonant DC transformer and a control method for magnetic bias suppression thereof, and the DC transformer consists of a low-voltage-side circuit breaker, a low-voltage-side DC support capacitor, a low-voltage-side full-bridge inverter, a resonant capacitor, an isolation transformer, a high-voltage-side DC support capacitor and a rectification circuit. During starting, pre-charging is carried out, a low-voltage side direct-current supporting capacitor is charged, and after charging is completed, progressive phase-shifting control is carried out on a low-voltage side full-bridge inverter in the series resonant direct-current transformer; a normal operation stage is carried out after pre-charging is completed, when shutdown occurs, resonance current flowing through leakage inductance of an isolation transformer is gradually reduced by controlling a low-voltage side circuit breaker and a low-voltage side full-bridge inverter, and non-magnetic-bias shutdown is carried out; and when a fault occurs, the series resonant direct-current transformer is locked according to the exciting current. According to the invention, magnetic bias suppression can be achieved without external demagnetization equipment or an auxiliary circuit.

The invention relates to the technical field of fault type diagnosis, in particular to a three-phase full-bridge inverter fault diagnosis method, system and equipment. The method comprises the following steps: acquiring a PWM command signal in a three-phase full-bridge inverter and an electric signal and a temperature signal of an IGBT device; based on the bridge arm on-off logic performance, the electric signal and the temperature signal of the IGBT device in the PWM instruction signal period, obtaining an on-off logic analysis coefficient and a conduction efficiency coefficient of the IGBT device, combining a fault determination threshold and a constraint condition, obtaining a fault type label of the IGBT, constructing a fault sample set, training a fault type identification model, and obtaining a fault type identification result; obtaining a trained fault type identification model; according to the method, the on-off logic analysis coefficient and the conduction efficiency coefficient are accurately obtained, so that the accuracy of fault type tag identification is effectively improved, the fault type of the IGBT device can be accurately identified in real time, corresponding processing is carried out in time, and the fault loss of the three-phase full-bridge inverter is effectively reduced.

The invention discloses a single-stage three-phase high-frequency isolation type conversion circuit and a closed-loop control method, and the single-stage three-phase high-frequency isolation type conversion circuit is based on the three-phase voltage of a three-phase three-wire system power grid and the three-phase current of the three-phase three-wire system power grid. A modulation ratio and a vector angle are generated on the basis of synchronously controlling fundamental waves and harmonic waves of three-phase current, a primary side driving signal and a secondary side driving signal are generated according to the modulation ratio and the vector angle, the primary side driving signal is used for driving a three-phase matrix converter, and the secondary side driving signal is used for driving a full-bridge inverter. The fundamental wave and the low-frequency harmonic wave of the power grid current can be synchronously controlled, the elimination of the low-order harmonic wave is facilitated, and the sine degree of the grid-connected current can be improved, so that the quality of the power grid current and the total harmonic distortion are improved.

A non-isolated converter includes a transformer having a primary winding and a secondary winding, a primary side inverter, a secondary side rectifier, and an output filter. The primary-side inverter is a full-bridge inverter that provides two conduction paths for the primary current during an on-interval of a switching cycle. The conduction paths are connected together at a low-end common junction directly connected to the output side of the secondary winding to provide a converter output current as a sum of the primary current and the secondary current during the turn-on interval. Because the converter output includes the contribution of the primary side current due to the direct connection, certain advantages can be achieved, such as reducing primary winding area / loss and reducing loss in the secondary side rectifier.

The invention provides a negative logic UC3901 isolation control circuit and method based on a phase-shifted full-bridge converter. The circuit is characterized by comprising a full-bridge inverter, a power transformer, a current doubler rectifier, a voltage and current sampling circuit, a voltage loop compensation network, a current loop compensation network, a magnetic isolation circuit, a main control circuit and a driving circuit, the full-bridge inverter, the power transformer and the current doubler rectifier form a power circuit of the converter, and the rest parts form a control circuit; the magnetic isolation circuit comprises a UC3901 chopping chip, an isolation transformer and a rectifier filter, and the UC3901 chip is used for chopping an analog control signal Vcoms of over 0.45 V, so that the analog control signal Vcoms becomes an alternating current signal, and magnetic isolation transmission of the analog signal is realized. A conventional magnetic isolation drive circuit is replaced by the magnetic isolation circuit, the size and the weight of the circuit are reduced, and meanwhile a novel magnetic isolation mode is provided.

This utility model discloses an orthogonally coupled dual-receiver wireless charging system for unmanned aerial vehicles (UAVs), comprising a ground transmitter and a UAV receiver. The ground transmitter includes a DC power supply, a transmitter control circuit, a full-bridge inverter, a transmitter coil, and a transmitter compensation capacitor. The UAV receiver includes a UAV landing gear, first and second receiver coils, a rectifier bridge, first and second receiver compensation capacitors, a filter capacitor, and a load. The DC power supply, full-bridge inverter, transmitter compensation capacitor, and transmitter coil are connected in sequence. The transmitter control circuit is connected to the full-bridge inverter. The first and second receiver coils are respectively connected to the first and second receiver compensation capacitors. The first and second receiver compensation capacitors are connected to the rectifier bridge. The rectifier bridge, filter capacitor, and load are connected in sequence. The first and second receiver coils are connected to the UAV landing gear. When the coupling coefficient of the system reaches the critical coupling coefficient, the system has three real solutions, achieving output power and efficiency independent of the coupling coefficient.

The invention provides an MC-WPT system with partial power control and a power adjusting and efficiency improving method thereof. A primary side of the system is provided with a primary side direct-current power supply, N primary side full-bridge inverters, N primary side compensation networks, a primary side capacitor and a primary side coil; the secondary side is provided with a secondary side coil, a secondary side capacitor, a secondary side first compensation network, a secondary side second compensation network, a secondary side passive rectifier, a secondary side active rectifier and a rechargeable power supply; according to the invention, a primary and secondary side cooperative control strategy of power level matching-redundant module cut-out-external shift phase angle resetting is adopted, the matching of the system power and the improvement of the efficiency are realized, the number of primary side modules is determined according to the power level requirement, and then the external shift phase angle is regulated and controlled by controlling the impedance angle of the secondary side modules, so that the power level of the system is improved. Therefore, the offset of the system power is realized, and the power adjusting range is obviously widened. The system can adapt to various application scenes such as vehicle-mounted wireless charging and industrial equipment power supply, and has remarkable engineering practical value.

In the traditional wireless power transmission technology, a full-bridge inverter is mostly adopted to realize alternating-current inversion, so that the problems that the cost of a wireless charging product is increased, the inversion frequency is limited and the like are caused. In order to realize high degree of freedom and low cost of a wireless charging product, an E-type inverter is often adopted to realize high-frequency inversion. And the E-type inverter adopts a single switching tube for inversion, so that the requirement on devices is low. However, the E-type inverter is greatly influenced by a load and is easy to work in a hard switching state due to load change, so that the working efficiency of the system is reduced, a switch is damaged under a serious condition, the stability of the system is reduced, and finally the application of the E-type inverter in an actual product is limited. The invention discloses a high-efficiency and wide-load soft switching system design scheme and a corresponding control strategy. In a wireless charging system adopting an E-type inverter, when the system works at a rated distance, a secondary side series compensation capacitor is connected, and when the transmission distance becomes closer, the efficiency and the power of the wireless charging system based on the E-type inverter are in a state that the efficiency and the power are suddenly reduced after being transiently increased. At the moment, if the system efficiency is obviously reduced or the temperature of the switching tube is abnormally increased, the secondary side compensation capacitor parallel switch is closed, the series compensation capacitor is equivalently cut off, the system is recovered to the soft switching state, the switching temperature is recovered to be normal, and the system efficiency and the output power are obviously improved.

The application discloses a control circuit of a five-level full-bridge inverter in the technical field of power electronics, and the five-level full-bridge inverter comprises a high-frequency bridge arm and a low-frequency bridge arm, the high-frequency bridge arm comprises four SiC tubes and two Si tubes, and the low-frequency bridge arm comprises two Si tubes; the control circuit comprises a closed-loop control circuit and a driving modulation circuit; the closed-loop control circuit comprises a sampling circuit and a closed-loop controller, the sampling circuit is used for collecting the current and voltage of the output end of the five-level full-bridge inverter; the closed-loop controller obtains the current and voltage of the output end of the five-level full-bridge inverter to generate a modulation signal; the driving modulation circuit obtains the modulation signal generated by the closed-loop controller to generate a driving signal, and sequentially drives the four SiC tubes to take turns to bear the switching loss, so that the switching losses among all the switching tubes are balanced, and the power level and conversion efficiency of the inverter are improved.