60 results about "Resonant inverter" patented technology

The invention discloses a current source type LCCL double-frequency resonance system and a parameter matching method thereof, which are suitable for synchronous double-frequency induction quenching of complex workpieces such as gears. The system is composed of two current type resonant inverters working at a low frequency and a high frequency respectively and a dual-frequency LCCL resonant cavity, and dual-frequency current superposition is realized through parallel output. The double-frequency LCCL resonant cavity has two parallel resonance points, a mode based on simplified topology is adopted to simplify parameter design, and meanwhile design errors are maintained at a low level. A power matching coefficient is introduced, the ratio of high-frequency output power to low-frequency output power is adjusted by adjusting the value of the power matching coefficient, and the problem of double-frequency power unbalance caused by frequency variation characteristics of load equivalent resistance and the like is solved. The superposed double-frequency current forms a low-frequency envelope embedded high-frequency oscillation composite waveform on the induction heating coil, cooperative control of tooth root deep quenching (low frequency) and tooth surface hard quenching (high frequency) is achieved, and the method has the advantages of being simple in parameter design, high in power decoupling performance, high in operation stability and the like.

A resonant inverter (1) is a three-level converter and operates under zero voltage turn-on control at a time of discharge. An auxiliary resonance circuit (2) includes a negative-side resonance path (rn) that has a current polarity limited to a direction from a resonance inductor (Lr) to a neutral point (A), and that is opened and closed by a switch element (Tr6). The auxiliary resonance circuit (2) includes a positive-side regeneration path (D5 + Dsp) that has a current polarity limited to a direction from the resonance inductor (Lr) to a positive-side DC line (P). The auxiliary resonance circuit (2) includes a negative-side regeneration path (D6 + Dsn) that has a current polarity limited to a direction from a negative-side DC line (N) to the resonance inductor (Lr).

A self-oscillating electronic LC resonant inverter for use in fixed-frequency power converters, providing zero-current and zero-voltage soft switching. The inverter incorporates an active fixed-frequency series resonant current pump capable of pumping the tank circuit current up as well as down. The magnitude of the resonant current is controlled at the resonant frequency of the LC tank circuit.

A resonant inverter has a switch network from which a phase signal is provided representing the phase of the switching signal. A resonant tank circuit is coupled to the first switch network output and provides a feedback signal comprising a resonance voltage across a circuit element of the resonant tank circuit. A reference current to be drawn from the input node is set and a reference phase is set based on the reference current. The switching signal for the switch network is controlled based on a phase difference between the resonance voltage and the phase signal, and based on the reference phase. This resonant inverter employs a phase modulation scheme as the control scheme for the switch network of a resonant inverter. This approach is suited for high and very high frequency operation of resonant converters, for example up to tens of MHz.

The invention discloses a circuit integration device for plasma ignition based on direct current power supply, relates to the field of plasma ignition, and aims to solve the problems that an existing plasma ignition technology cannot be directly compatible with aviation low-voltage direct current and is poor in reliability. A core electronic function module comprises a high-frequency resonance inversion topological unit, an energy driving adjustment topological unit, a full-wave rectification topological unit, a control unit, an arc striking unit and an energy storage unit. The high-frequency resonant inversion topology unit converts input direct current into high-frequency alternating current pulse; the energy driving and adjusting topological unit drives and adjusts the high-frequency resonant inversion topological unit, so that the alternating voltage output by the high-frequency resonant inversion topological unit is increased to 400-430V; the full-wave rectification topological unit converts the alternating current voltage output by the high-frequency resonance inversion topological unit into stable direct current high voltage and supplies power to the control unit, the arc striking unit and the energy storage unit.

The utility model discloses a spatial high-efficiency high-voltage direct current module, which belongs to the technical field of high-voltage direct current output and comprises an input rectifying and filtering module, a step-down chopper circuit module, a direct current DC1, a direct current DC2, a direct current DC1, a direct current DC1, a direct current DC1, a direct current DC2, a direct current DC1 and a direct current DC1, the three-phase LLC resonant inverter circuit module is used for converting direct current DC2 into high-voltage alternating current AC2, the output rectifying and filtering module is used for converting the high-voltage alternating current AC2 into high-voltage direct current DC0, and the fault isolating circuit module is used for isolating a fault part from other parts when the modules fail. According to the technical key points, the magnitude of the output voltage can be adjusted by controlling the on-off time of a full-control device IGBT (Insulated Gate Bipolar Transistor), so that the stability and the accuracy of the final output voltage are ensured, and in addition, the three-phase LLC resonant inverter circuit has relatively high conversion efficiency and relatively good electric energy quality, and can meet the requirement of high-efficiency high-voltage direct-current output.

A method for controlling a quasi-resonant inverter (13) in an induction cooking appliance (1) provided with an induction heating coil (4) is disclosed. The quasi-resonant inverter (13) comprises a switching device (21) electrically connected to the induction heating coil (4) through a node (20) having a first voltage (VC(t)) indicative of a voltage across the power switching device (21). The method comprises the steps of: providing an enabling signal (K1) comprising a plurality of pulses to the switching device (21) in order to turn on and off said switching device (21) within a turn-on period (tON) and a turn-off period (tOFF); determining a second voltage (VCmin) indicative of a minimum value of the first voltage (VC(t)) during the turn-off period (tOFF); adjusting the turn-off period (tOFF) based on the second voltage (VCmin); and adjusting the enabling signal (K1) based on the adjusted turn-off period (tOFF).

To provide a resonance type inverter capable of constructing an auxiliary resonance circuit of a lossless auxiliary resonance circuit that is a path of an energy accumulated to a resonance inductor with a breakdown element that is lower than that of a main circuit.SOLUTION: An auxiliary resonance circuit 2 comprises: a positive side resonance path rp in which a current polarity is limited to a direction of a resonance inductor Lr from a neutral point A, and is switched by a switch element Tr3; a negative side resonance path rn in which the current polarity is limited to a direction of the neutral point A from the resonance inductor Lr, and is switched by a switch element Tr4; a positive side regeneration route (D3+Dsp) in which the current polarity is limited to the direction of a positive side DC line P from the resonance inductor Lr; and a negative side regeneration route (D4+Dsn) in which the current polarity is limited to the direction of the resonance inductor Lr from a negative side DC line N.SELECTED DRAWING: Figure 1

A self-oscillating electronic LC resonant inverter for use in fixed-frequency power converters, providing zero-current and zero-voltage soft switching. The inverter incorporates an active fixed-frequency series resonant current pump capable of pumping the tank circuit current up as well as down. The magnitude of the resonant current is controlled at the resonant frequency of the LC tank circuit.

Disclosed is a high-power resonant inverter system (100) for wireless power transfer. The system (100) includes a control block (102) that generates control input signals. A synchronous gate driving arrangement (104), isolated from the main power circuit, operates a series-parallel configuration of plurality of switching elements (106). The series connection of switching elements increases voltage handling capability, while the parallel connection increases current handling capability. Furthermore, a voltage balancing network (108) evenly distributes voltage stress across the plurality of switching elements (106). Additionally, a resonant tank circuit (110) is coupled to the voltage balancing network (108) for efficient wireless power transfer.

The present invention relates to the technical field of wireless charging power supply, and in particular to a half-bridge resonant inverter type magnetically coupled resonant wireless charging power supply, which includes a transmitting end circuit and a receiving end circuit, wherein the transmitting end circuit includes an EMI filter circuit, a first rectifier filter circuit, a half-bridge LCC resonant inverter circuit, a first auxiliary power supply, a first signal conditioning circuit, a control circuit and a first communication circuit; the receiving end circuit mainly includes a parallel resonant circuit, a second rectifier filter circuit, a second auxiliary power supply, a second signal conditioning circuit and a second communication circuit. The present invention combines the inverter topology with the resonant topology to achieve input power regulation and reduce the size and weight of the transmitting end; wireless communication between the transmitting end and the receiving end circuit is achieved through the first communication circuit and the second communication circuit, while improving the dynamic and static performance of the power supply, ensuring that the receiving end circuit has the advantages of small size and simple structure, and has good market application value.

A power electronics system (1) for supplying an electric machine (100), preferably a motor vehicle (101), is proposed, wherein the power electronics system (1) comprises an n-phase resonant inverter (2), the resonant inverter (2) comprising a first semiconductor switch (3) and a second semiconductor switch (4) per phase, the resonant inverter (2) comprising a plurality of first snubber capacitors (5) and a plurality of second snubber capacitors (6), wherein the first snubber capacitors (5) can be selectively connected in parallel with the first semiconductor switch (3) and the second snubber capacitors (6) can be selectively connected in parallel with the first semiconductor switch (4). Furthermore, a method for operating a power electronics system (1) and a motor vehicle (101) are proposed.

The invention relates to a motor vehicle with motor vehicle-to-grid functionality, comprising an electric machine, a high-voltage battery, an inverter, and a disconnect switch, wherein the high-voltage battery is connected to the inverter to supply the inverter with energy, and the inverter is connected to the electric machine and configured to supply the electric machine with energy, wherein the inverter is configured as a three-phase inverter, wherein the inverter comprises a first inverter circuit configured to supply the electric machine and a second inverter circuit configured to supply the electric machine, wherein the inverter is configured as a resonant inverter, and wherein the electric machine is configured as an open-end winding configuration with split input windings for each of the phases and a three-phase center tap, wherein the center tap is connected to a disconnect switch.

The invention relates to low-intensity focused ultrasound prostate physiotherapy equipment and a physiotherapy head thereof, and belongs to the field of focused ultrasound therapy. The device is characterized in that the ultrasonic control circuit can generate driving signals of various waveforms according to treatment requirements, the LCC power resonant inverter is adopted to realize power amplification, the problems of switching loss and signal distortion are solved, and a PDM modulation method is introduced to realize adjustability of output power. A phase difference detection method is adopted to calculate the propagation time of ultrasonic waves in a heated biological tissue, and an automatic frequency tracking function is introduced to ensure that the transducer is always in an optimal resonance state and is accurately focused on a target treatment area. Simultaneously acquiring a voltage effective value and a current effective value of the current state of the ultrasonic physiotherapy head; determining the current impedance of a transducer of the ultrasonic physiotherapy head according to the voltage effective value and the current effective value of the current state of the ultrasonic physiotherapy head, and judging whether the ultrasonic physiotherapy head enters an acoustic coupling state or not according to the current impedance; and when the ultrasonic physiotherapy head does not enter the acoustic coupling state, the ultrasonic excitation module is controlled to stop power output.

The invention discloses a power management method and system for an intelligent electric hinge. The method comprises the steps that primary temperature control is conducted on a circuit board and a power storage module of a door leaf receiving end; the door frame transmitting end adopts a full-bridge LLC resonant inverter circuit and drives a transmitting coil at specified high frequency, and after the door leaf receiving end receives electric energy, a synchronous rectification circuit is adopted for rectification to obtain initial voltage; the power management module carries out constant current-constant voltage equalizing charging on the battery pack in the power storage module, and carries out secondary temperature control on the receiving end circuit board according to a temperature threshold value; and a DC-DC unit in the power management module is utilized to convert the initial voltage or the power supply voltage of the power storage module according to the request of the multi-path function module and the control instruction of the power management module, and multi-path output voltage is obtained respectively. Smooth operation of each functional module is guaranteed, and power consumption in the electric energy conversion process is effectively reduced.

A power conversion system comprising, three full wave LLC resonant converters each of which has an associated high frequency isolation transformer, a full wave rectifier and an unfolding inverter, to provide a direct connection to a Medium Voltage (MV) three-phase grid for a high power photovoltaic system.

To provide a resonance type inverter capable of constructing an auxiliary resonance circuit of a lossless auxiliary resonance circuit that is a path of an energy accumulated in a resonance inductor with a breakdown element that is lower than that of a main circuit.SOLUTION: A resonance type inverter 1 is a third-level converter, and can control a resonance operation as a second-level converter at a charging, and is operated in a zero voltage turning on control. An auxiliary resonance circuit 2 comprises a negative side resonance path rn in which a current polarity is limited to a neutral point A from a resonance inductor Lr, and is switched by a switch element Tr6. The auxiliary resonance circuit 2 comprises a positive side regeneration route (D3+Dsp) in which the current polarity is limited to a P direction of a positive side DC line from the resonance inductor Lr. The auxiliary resonance circuit 2 comprises a negative side regeneration route (D4+Dsn) in which the current polarity is limited to a direction of the resonance inductor Lr from a negative side DC line N.SELECTED DRAWING: Figure 1

This invention addresses the problem of effectively filtering multi-band and multi-bandwidth spectral signals by proposing a differential bandpass filter with simultaneously adjustable bandwidth and frequency band, featuring reconfigurable center frequency and bandwidth. The differential bandpass filter structure has two main parts: a resonant inverter and a parallel resonator. The programmability and reconfigurability of the differential bandpass filter are achieved by adjusting the resonant characteristics of the even / odd mode sub-circuit network of the resonant inverter. The bandwidth can be adjusted when the relative relationship between these resonators and the transmission zeros of the parallel resonator changes; when all resonant points shift while maintaining their spectral bandwidth, the center frequency is tuned to a constant absolute bandwidth. Therefore, the center frequency and bandwidth of the differential bandpass filter can be arbitrarily reconfigured and programmed within their maximum range of variation.

A method and device for controlling a resonant inductor for implementing ZVS in a push-pull parallel resonant inverter is closed. The present disclosure provides A device comprising: a converter including a full-bridge circuit in which a first switch and a second switch form a first leg and a third switch and a fourth switch form a second leg and configured to convert a DC into an AC by turning on or off the switches; a resonant inductor circuit including a resonant inductor and a resonant switch connected in series and connected between two output nodes of the converter; a transmission coil connected in parallel with the resonant inductor circuit; and a controller configured to convert the DC into the AC by providing a switching timing for turning on or off the switches and control a switching timing of the resonant switch based on switching timings of the switches.

A parallel resonant inverter includes a first inductor, a first switch tube, a second switch tube, a parallel resonant module, a first isolation capacitor, and a second isolation capacitor. The first inductor, a drain of the first switch tube, a source of the first switch tube, and an external DC power supply are sequentially connected in series to form a first loop. The first inductor, the parallel resonant module, a drain of the second switch tube, a source of the second switch tube, and the external DC power supply are sequentially connected in series to form a second loop. The first inductor, the first isolation capacitor, an external load, the second isolation capacitor, the drain of the second switch tube, the source of the second switch tube, and the external DC power supply are sequentially connected in series to form a third loop.

To provide a resonance type inverter capable of constructing an auxiliary resonance circuit of a lossless auxiliary resonance circuit that is a path of an energy accumulated to a resonance inductor with a breakdown element that is lower than that of a main circuit.SOLUTION: A resonance type inverter 1 is a three-level converter, and is operated by a zero voltage turn on control at a discharge. An auxiliary resonance circuit 2 comprises a negative side resonance path rn in which a current polarity is limited to a direction of a neutral point A from a resonance inductor Lr, and is switched by a switch element Tr6. The auxiliary resonance circuit 2 comprises a positive side regeneration route (D3+Dsp) in which a current polarity is limited to a direction of a positive side DC line P from the resonance inductor Lr. The auxiliary resonance circuit 2 comprises a negative side regeneration route (D4+Dsn) in which the current polarity is limited to the direction of the resonance inductor Lr from a negative side DC line N.SELECTED DRAWING: Figure 1

The present invention relates to the field of wireless power transmission technology, and specifically discloses a Fibonacci double-helix coupling mechanism and a wireless power transmission system based thereon. The two transmitting coils of the transmitting mechanism are orthogonally distributed, and the two receiving coils of the receiving mechanism are orthogonally distributed. Each coil is arranged based on the Fibonacci interval into a flat solenoid coil with a sparse center and dense sides. When a horizontal or vertical offset or rotational offset occurs, the coupling coefficient is only moderately reduced, and the system has strong resistance to horizontal offset, vertical offset, and rotation. Moreover, the coupling mechanism still has strong resistance to horizontal offset and vertical offset after rotation, and the system has strong comprehensive anti-offset capability. The system uses a dedicated single-tube high-frequency resonant inverter with only one MOS tube, and the total harmonic distortion of the system current is very small. The constructed experimental prototype achieves a constant voltage 24V output within the range of ±70mm for vertical and horizontal offsets, and the overall system efficiency is not less than 92%.

The resonant inverter (1) is a three-level converter and operates by zero-voltage turn-on control during discharge. The auxiliary resonance circuit (2) is provided with a negative-side resonance path (rn in which the current polarity is limited in a direction from the resonance inductor (Lr) to the neutral point (A), and which is opened and closed by a switching element (Tr6). The auxiliary resonance circuit (2) is provided with a positive-side regeneration path (D5 + Dsp) in which the current polarity is defined in the direction from the resonance inductor (Lr) to the positive-side DC line (P). The auxiliary resonant circuit (2) is provided with a negative-side regeneration path (D6 + Dsn) in which the current polarity is defined in the direction from the negative-side DC line (N) to the resonant inductor (Lr).

The auxiliary resonance circuit (2) is provided with: a positive-side resonance path (rp) that is opened and closed by a switching element (Tr3), the current polarity of which is defined in the direction from the neutral point (A) to the resonance inductor (Lr); a negative-side resonance path rn that is opened and closed by a switching element Tr4, the current polarity of the negative-side resonance path rn being defined in a direction from the resonance inductor Lr toward the neutral point A; a positive-side regeneration path (D3 + Dsp) whose current polarity is defined in a direction from the resonant inductor Lr toward the positive-side DC line P; and a negative-side regeneration path (D4 + Dsn), the current polarity of which is defined in a direction from the negative-side DC line N toward the resonant inductor Lr.

A resonant inverter has a switching network from which a phase signal is provided representing a phase of a switching signal. A resonant tank circuit is coupled to a first switching network output and provides a feedback signal comprising a resonant voltage across circuit elements of the resonant tank circuit. A reference current is set to be drawn from an input node and a reference phase is set based on the reference current. The switching signal of the switching network is controlled based on a phase difference between the resonant voltage and the phase signal and based on the reference phase. The resonant inverter employs a phase modulation scheme as a control scheme for the switching network of the resonant inverter. The approach is suitable for high frequency and very high frequency operation of the resonant converter, e.g. up to tens of MHz.

The utility model discloses a dual-module three-phase four-bridge-arm auxiliary converter control system for a metro vehicle. The dual-module three-phase four-bridge-arm auxiliary converter control system comprises an auxiliary converter power circuit and an auxiliary converter control circuit for controlling the auxiliary converter power circuit, the auxiliary converter power circuit comprises a Buck three-level converter, a resonant single-phase inverter, an intermediate frequency transformer, a single-phase full-bridge rectifier, a three-phase four-bridge-arm inverter, an LC filter and a contactor. The auxiliary converter control circuit comprises a voltage-frequency composite control unit, a voltage closed-loop control unit, a current closed-loop control unit, a three-dimensional space vector control unit, a resonance inversion control unit, a Buck three-level control unit, a synchronous phase locking unit, a phase angle selection unit, an instantaneous power calculation unit and a droop control unit. The utility model provides a dual-module three-phase four-bridge-arm auxiliary converter control system for a metro vehicle, which reduces the loss of a power circuit switch in the system, improves the conversion efficiency of the system and greatly prolongs the service life of equipment.

The present invention provides a multi-coil single-transistor wireless power transmission circuit, system and control method, including a primary circuit and a secondary circuit, wherein the primary circuit includes multiple single-transistor resonant inverter wireless power transmitting circuits connected in parallel to a DC power supply, and the secondary circuit includes multiple wireless power receiving circuits corresponding one-to-one to the single-transistor resonant inverter wireless power transmitting circuits, wherein each of the single-transistor resonant inverter wireless power transmitting circuits includes an LC resonant circuit, an LCC compensation network and a transmitting coil, wherein: the LC resonant circuit includes a resonant inductor L connected in series between the two ends of the DC power supply; a and resonant capacitor C a , the resonant capacitor C a The switch tube Q is connected in parallel with the upper coil. Its effect is: reducing the sudden change of input current, enhancing system efficiency, and effectively eliminating the ripple of input current and partial circulating current between coils by controlling the phase shift of multi-coil excitation current, making the input current stable and improving the system power level.

This application provides an adjustable capacitance value water-cooled laminated busbar for LLC resonant inverters, relating to the field of induction heating power supplies. The busbar includes a laminated busbar, water-cooling pipes, resonant capacitors, insulating pads, copper nuts, and insulating nuts. Multiple resonant capacitors are spaced apart on one side of the laminated busbar, each containing multiple terminals. These terminals are embedded in pre-fabricated through-holes in the laminated busbar, with gaps between the terminals and the inner walls of the through-holes. Copper nuts or insulating nuts are selectively fitted into the gaps between the terminals and the through-holes. Terminals fitted with copper nuts are conductive to the laminated busbar, while terminals fitted with insulating nuts are insulated from the laminated busbar. Water cooling is coiled around the surface of the laminated busbar surrounding the resonant capacitors. Through structural optimization and adjustable capacitance design, the device's adaptability is improved, its operating frequency is stabilized, and its service life is extended. It also provides efficient heat dissipation and allows for rapid and precise on-site capacitance adjustment.

Method to control a quasi-resonant inverter (13) in an induction cooking appliance (1) provided with an induction heating coil (4). A switching device (21) is electrically connected to the induction heating coil (4) by a node (20) having a first voltage (VC(t)) which is indicative of the voltage across the power switching device (21). The method includes: providing to the switching device (21) an enabling signal (K1) comprising a plurality of pulses, in order to switch-on and switch-off the switching device (21) for a switch-on period (tON) and a switch-off period (tOFF), determining a second voltage (VCmin) indicative of the minimum value of the first voltage (VC(t)) during the switch-off period (tOFF), regulating the switch-off period (tOFF) based on the second voltage (VCmin), and regulating the enabling signal (K1) based on the regulated switch-off period (tOFF).

The resonant inverter (1) is a three-level converter, and the resonant operation can be easily controlled as a two-level converter during charging. And the action is performed by zero-voltage turn-on control. The auxiliary resonance circuit (2) is provided with a negative-side resonance path (rn in which the current polarity is limited in a direction from the resonance inductor (Lr) toward the neutral point (A), and which is opened and closed by a switching element (Tr6). The auxiliary resonance circuit (2) is provided with a positive-side regeneration path (D5 + Dsp) in which the current polarity is defined in the direction from the resonance inductor (Lr) to the positive-side DC line (P). The auxiliary resonant circuit (2) is provided with a negative-side regeneration path (D6 + Dsn) in which the current polarity is defined in the direction from the negative-side DC line (N) to the resonant inductor (Lr).