72 results about "Zero voltage switching" patented technology

The invention discloses a TCM-mode-based Si-SiC hybrid power multi-phase staggered H-bridge converter structure and a control method thereof, according to the scheme, a three-phase staggered parallel topology of a two-phase low-frequency Si-IGBT bridge arm and a one-phase high-frequency SiC-MOSFET bridge arm is adopted, and a TCM control strategy is combined, so that zero voltage switching (ZVS) of a Si device is successfully realized, the switching loss is remarkably reduced, and the switching efficiency is improved. The system efficiency is greatly improved; and meanwhile, through pilot frequency interleaving and ripple compensation technologies, total output current ripples are greatly reduced, and optimal balance between system performance and manufacturing cost is realized while the power capacity of the converter is remarkably expanded and the dynamic response speed and the output electric energy quality are improved.

Disclosed is a system for zero voltage switching in a power converter with a first half-bridge and a second half-bridge. The first half-bridge has a first set of transistors and output inductor. The second half-bridge has a second set of transistors and auxiliary inductor. A current sensing means measures, at switching cycle scale, average and maximum current values of output inductor and average, minimum and maximum current values of auxiliary inductor. A voltage sensing means measures input and output voltages of first and second half-bridge. A controller is configured to compute dead times of pulse width modulation control signal of second half-bridge, generate pulse width modulation control signal of second half-bridge and to adapt dead times of first half-bridge.

The invention discloses a bidirectional DC-AC converter control method considering a soft switching condition and current optimization. According to the invention, the switching loss of the converter is reduced by optimizing the phase shift angle and the switching condition of the converter, and the energy transmission efficiency is optimized by minimizing the effective value of the current, so that the performance of the whole sodium battery energy storage system is improved. Specifically, based on the relation between the excitation inductance Lm and the current effective value Iprms, the phase shift angle of the converter is accurately controlled, the current transmission efficiency is optimized, and it is ensured that the zero-voltage switching condition of a primary side bridge arm and a secondary side bridge arm can be achieved in the working process, so that the loss of the converter is remarkably reduced, and the energy conversion efficiency is improved.

An example apparatus can include one or more of a transformer, a primary circuit electrically coupled to the transformer, and a first auxiliary circuit and a second auxiliary circuit, wherein the primary circuit includes a first bridge leg having a first pair of switches and a second bridge leg having a second pair of switches, the first auxiliary circuit is electrically coupled to the first bridge leg of the primary circuit, the second auxiliary circuit is electrically coupled to the second bridge leg of the primary circuit, wherein each auxiliary circuit is configured to store energy when one switch of a respective pair of switches is on and the other switch of the respective pair of switches is off, and provide the stored energy to recharge all attached capacitances in the respective bridge leg when both switches of the respective pair of switches are off.

According to one embodiment, a power amplifier includes a plurality of switches and an output tank network. One or more of the switches are configured to generate one or more first intermediate waveforms having one or more first fundamental frequency components, and one or more of the switches are configured to generate one or more second intermediate waveforms by chopping the one or more first intermediate waveforms with controllable timing. The second intermediate waveforms have one or more second fundamental frequency components that are controllably reduced from those of the one or more first intermediate waveforms. The output tank network is configured to filter the one or more second intermediate waveforms to provide an output waveform to a load, the output waveform having one or more third fundamental frequency components. In some cases, all switches achieve zero voltage switching under different power and load conditions with resistive and reactive loads.

The utility model discloses a resonant LLC switching power supply converter and a zero-voltage switch control circuit thereof, and the converter comprises a first switch module, a second switch module, a third switch module, a fourth switch module, a first capacitor module, a second capacitor module, a third capacitor module, an inductor module, and an isolation module. The zero-voltage switch control circuit comprises a reference voltage module, a current detection module, a first control module and a second control module, and the reference voltage module, the current detection module, the first control module and the second control module work cooperatively. The switching loss of the first switching module and the second switching module of the resonant LLC switching power supply converter is dynamically controlled and greatly reduced.

The application provides a mixed control LLC series resonant converter dead-time control method, which respectively calculates the current of phase leading and lagging bridge arm switch time and the shortest dead-time required for realizing ZVS (zero voltage switching), and uses a parameter fitting method to simplify the calculation amount, and controls the dead-time of two bridge arm switches in real time on an embedded controller. The application considers the different dead-time required for realizing zero voltage switching of the two bridge arm switches of the primary side of the mixed control LLC series resonant converter, and controls in real time, so that the primary side switch loses zero voltage switching due to working condition change is prevented, and the reverse conduction time of the switch is reduced as much as possible, and the loss is reduced. The application has good application effect in the mixed control LLC series resonant converter with high frequency and wide gain range.

A system includes four primary side switches of a primary bridge of a dual active bridge (DAB) converter; four secondary side switches of a secondary bridge of the DAB converter; and a control circuit configured to operate the DAB converter in a first mode in which all of the four secondary side switches operate under zero voltage switching (ZVS) and less than all of the four primary side switches operate under ZVS; and in response to a thermal condition, operating the DAB converter in a second mode in which less than all of the four secondary side switches operate at the ZVS and all of the four primary side switches operate at the ZVS. A method includes operating a control circuit of an operating system to implement a first mode and a second mode. In some embodiments, the control circuit switches between a first mode and a second mode based on one or more thermal conditions.

A non-isolated DC-to-DC switching hybrid converter is implemented using a cross-coupled series-capacitor quadruple step-down buck converter topology. In some embodiments, the DC-to-DC switching hybrid converter includes a switched-capacitor converter circuit and incorporates a zero-voltage switching network to implement soft switching and a coupled inductor to realize a fixed step-down ratio. The hybrid converter is capable of supporting a high step-down ratio (such as 8:1) while providing high efficiency. In other embodiments, the DC-to-DC switching hybrid converter incorporates a transformer in place of the coupled inductor to further increase the step-down ratio.

The embodiment of the invention provides a flyback conversion circuit, a control method thereof and a control chip. The flyback conversion circuit comprises a primary side unit, a secondary side unit and an auxiliary unit, the primary side unit comprises a main switch tube and a primary side winding, the first end of the primary side winding is electrically connected with a power supply, the second end of the primary side winding is electrically connected with the first end of the main switch tube, and the second end of the main switch tube is electrically connected with reference ground; the secondary side unit comprises a secondary side winding; the auxiliary unit comprises an auxiliary switch tube, a first capacitor and an auxiliary winding; the first end of the auxiliary winding is electrically connected with the first end of the first capacitor, the second end of the first capacitor is electrically connected with the first end of the auxiliary switch tube, and the second end of the auxiliary switch tube is electrically connected with the second end of the auxiliary winding; the second end of the auxiliary winding is electrically connected with the reference ground; the second end of the primary winding, the first end of the auxiliary winding and the first end of the secondary winding are dotted terminals. The flyback conversion circuit can realize zero-voltage switching in different working modes, so that the working efficiency is improved.

The invention relates to an active clamping flyback converter and a control method thereof, and belongs to the field of flyback converters. According to the active clamping flyback converter, voltage stabilization of output voltage is achieved through a double-closed-loop control structure composed of a peak current mode loop and a dead time control loop, and the peak current mode loop is used for controlling the conduction time of a main switching tube. And the dead time control loop is used for detecting whether the active clamping flyback converter realizes a soft switching function or not. A double-loop control loop of a peak current mode and a dead time control mode is adopted, the problem that when the active clamping flyback converter is in light load, zero voltage switching is difficult to achieve in the first switching period, and additional loss is caused is solved, the cost of circuit design is effectively reduced, the occupied size is reduced, and the integration level is improved.

The invention relates to the technical field of wireless charging, in particular to a wireless charging control system and method based on soft switching, and the system comprises a data collection module which scans load identification information through a near field communication unit, and a parameter calculation module which calculates a frequency control instruction and the number of parallel modules according to a pre-stored voltage gain mapping relation. The control signal generation module is used for generating a PWM driving signal, the power transmission module comprises a single-tube inverter circuit and a magnetic coupling structure, and the soft switching monitoring module is used for collecting voltage and current waveforms of a switching tube and judging a soft switching state. Through a modularized closed-loop control architecture, the voltage sine of a switching tube is attenuated to zero by using a resonance network in the turn-off stage of an MOSFET, so that a zero-voltage switching condition is realized, the switching loss and thermal stress are effectively reduced, the system efficiency is improved, and power expansion is supported.

The utility model relates to the technical field of semiconductor device especially is a kind of GaN device zero-voltage switch control device, including zero-voltage switch control circuit board and GaN chip main part, zero-voltage switch control circuit board upper end fixed mounting has GaN chip main part, zero-voltage switch control circuit board inside plug-in installation has wiring terminal, wiring terminal includes compression type wiring terminal shell, compression type wiring terminal shell bottom end is fixedly connected with pin, compression type wiring terminal shell inside spiral connection has screwing pressure subassembly, compression type wiring terminal shell inside installation has moving assembly, compression type wiring terminal shell inside fixedly connected with guide tube, compression type wiring terminal shell inside slidingly connected with moving plate, in the utility model, device has realized to the three-dimensional wrapping formula fixing of wire, anti-skid groove on pressure disc and anti-rotation groove on pressure block can effectively suppress the radial displacement and radial rotation of wire under high-frequency vibration environment, prevent wire from sliding from wiring terminal.

A controller for a power converter includes a primary controller and a secondary controller. The primary controller is coupled to a primary winding of the energy transfer element and a primary switch of the power converter. The secondary controller is coupled to a secondary winding of the energy transfer element and a secondary switch, e.g., a synchronous rectifier, of the power converter. The secondary controller has a synchronous rectifier control / drive circuit, a control logic circuit, and a cross conduction detector circuit. Cross conduction is when the primary switch turns on when the secondary switch is active. The cross-conduction detector circuit produces a Disable SR signal when cross conduction event detected. The cross-conduction detector circuit detects zero voltage switching cross conduction event and a minimum conduction period cross conduction event. The SR drive circuit disables the synchronous rectifier in response to receiving the Disable SR signal.

A method comprises: in an onboard charger of an electric vehicle, providing i) a direct current (DC) to DC stage including a dual-active bridge, and ii) a DC link capacitor having a DC bus voltage; and dynamically regulating the DC bus voltage to improve zero voltage switching (ZVS) in the onboard charger.

A method comprises: providing, in an onboard charger of an electric vehicle, a direct current (DC) to DC stage including a dual-active bridge having switches arranged in multiple legs, each of the multiple legs controlled by a corresponding one of pulse width modulation (PWM) signals; and dynamically modulating the PWM signals to improve zero voltage switching (ZVS) in the onboard charger.

A half-bridge flyback converter and a control method thereof. The half-bridge flyback converter includes a first transistor, a second transistor and a third transistor, wherein the first transistor, the second transistor and the third transistor are used to constitute a half-bridge circuit. The first transistor is turned on to generate a negative circulating current to achieve zero voltage switching of the second transistor. The second transistor is turned on to excite a transformer. The third transistor is turned on in a demagnetization period of the transformer to generate an output voltage. The actual size of the first transistor is smaller than the actual size of the third transistor.

The application discloses a continuous mode bridgeless power factor correction circuit and a control method thereof, which comprises an alternating voltage source AC, a diode D1, a diode D2, a main switch Q1, a main switch Q2, an output capacitor C1, a positive half cycle control circuit and a negative half cycle control circuit. In the application, the freewheeling diode is reversely biased before the main switch is turned on, and the current is transferred to the control circuit auxiliary super-fast diode branch. The body diode of the freewheeling diode has no reverse current when the main switch is turned on, and can work at high frequency. Through proper dead zone setting, the freewheeling diode can realize zero voltage switching. The control circuit only works for a short time, the control method is simple, the average power is small, and the cost is low.

Systems and methods for operating a wireless power transfer device are described. A circuit can generate a first signal that indicates a voltage at a node between a first high-side (HS) transistor and a first low-side (LS) transistor in a switching converter falling below ground. The circuit can delay a gate-source voltage of a second LS transistor in the switching converter to generate a second signal. The circuit can merge the first signal and the second signal to generate a third signal. A controller can use the third signal to trigger a rising edge of a command signal to turn on the first LS transistor at a specific time. The first LS transistor being turned on at the specific time reduces a diode conduction time of a body diode of the first LS transistor.

The invention relates to dual active bridge parameter estimation for control configuration. Systems and methods for operating a dual active bridge (DAB) converter include a transformer flowing a current through the DAB converter; measuring the current; determining a leakage inductance of the transformer based on the measured current; and determining a control scheme for operating the DAB converter based on the leakage inductance of the transformer. In some embodiments, determining the leakage inductance includes determining a slot resistance of the transformer. In some embodiments, the control scheme includes a gain scheduling, zero voltage switching scheme, or both, where the control scheme is different from a nominal control scheme based on nominal leakage inductance and improves power conversion efficiency or accuracy of the output voltage compared to the nominal control scheme.

The embodiment of the application discloses a control method and a switching power supply. The control method comprises the following steps: after the high-voltage starting of the switching power supply, and when the switching time interval of the second switch tube is equal to or smaller than the first preset value, the secondary side control module acquires the voltage waveform of the second connection point between the secondary side winding and the second switch tube; when the voltage waveform of the second connection point does not realize zero voltage switching, the secondary side control module adjusts the off current of the second switch tube until the voltage waveform of the first connection point between the primary side winding and the first switch tube is just zero; when the voltage waveform of the first connection point is just zero, the primary side control module controls the first switch tube to be turned on, so as to realize the zero voltage opening of the primary side. The embodiment reduces the switching loss of the switching power supply, and improves the EMI characteristics of the switching power supply.

Disclosed herein is a controller for an auxiliary resonant commutated pole (ARCP) converter, the controller comprising: a sensor portion comprising: a ZVD sensor configured to measure a voltage across a switch of the converter, and to detect a time when the voltage across the switch equals zero; a dv / dt sensor configured to measure changes in voltage across the switch over time, and to detect voltage transitions across the switch; and a gate sensor configured to measure a gate-source voltage of the switch and detect a time during which the gate-source voltage is sufficient to transition the switch between OFF and ON; and a control section configured to: receive measurement values from the ZVD sensor, the dv / dt sensor, and the gate sensor; and generate a control signal for the switch based at least in part on measurements received from the ZVD sensor, the dv / dt sensor, and the gate sensor.

The invention provides a power conversion circuit and a control method thereof, and the power conversion circuit is used for converting an input voltage into an output voltage, and comprises a transformer, a resonant capacitor, an upper bridge transistor, a lower bridge transistor and a control circuit. The transformer includes a primary coil and a secondary coil coupled between the switching node and the resonant node. The resonant capacitor is coupled between the resonant node and a ground terminal, and the resonant current flows through the resonant capacitor. The upper bridge transistor is coupled between an input voltage and a switching node, and the lower bridge transistor is coupled between the switching node and a ground terminal. The control circuit drives the upper bridge transistor and the lower bridge transistor based on the output voltage and the resonance current. When the resonance current reaches a first threshold value, the control circuit turns off the lower bridge transistor, so that the upper bridge transistor achieves zero-voltage switching.

The application relates to the technical field of gallium nitride inverters, and discloses a gallium nitride inverter adaptive dead-time adjusting method and system. The method comprises the following steps: after the upper tube of the gallium nitride inverter is turned off, the bridge arm voltage sequence of the bridge arm switch node and the freewheeling current sequence of the lower tube are collected; the bridge arm voltage transient slope value is calculated based on the bridge arm voltage sequence, and the zero-voltage switching margin value is calculated; the dead-time reference value is generated according to the bridge arm voltage transient slope value and the freewheeling duration value; the zero-voltage switching margin value is adjusted to the preset target margin value, the dead-time compensation increment is obtained, and the current cycle dead-time value is generated; and the rising edge and the falling edge of the reference pulse width modulation signal are respectively delayed by driving the programmable delay line according to the current cycle dead-time value, so that the first gate drive pulse signal of the upper tube and the second gate drive pulse signal of the lower tube are generated. The application effectively solves the dead-time optimization problem caused by the nonlinear turn-off characteristics of the gallium nitride device.

The invention discloses a single-stage dual-active micro inverter with a wide voltage range and zero voltage switching, and belongs to the field of power electronic conversion. The inverter comprises a direct-current voltage source Vdc, an alternating-current voltage source Vg, a primary direct-current side H, a secondary alternating-current side matrix two-way switch full bridge and a secondary alternating-current side matrix two-way switch full bridge, the working mode is that chopping is carried out on power grid voltage, quasi-two-level voltage Vcd is generated, a modulation strategy of combination of expansion phase shift and frequency conversion is adopted, and the transformer comprises an inductor L and a transformation ratio of n: 1. A modulation strategy of combining expanded phase shift with frequency conversion is adopted, and soft switching operation in a wide voltage range and a wide load range is carried out by adjusting an inner shift phase ratio D1 and an outer shift phase ratio D2 in combination with frequency f. According to the invention, no extra hardware circuit is needed, full-switching-tube ZVS operation is realized in a wide voltage and wide load range, grid-connected current harmonic distortion is low, conversion efficiency is high, and a distributed new energy grid-connected demand is satisfied.

A system and method for use in matching a source to a dynamic impedance electrical load is described. The system may include a zero voltage switching amplifier and a variable signal generator, where the zero voltage switching amplifier is in communication with a resonant load. The system also includes a microcontroller for executing an algorithm that causes the microcontroller to locate a resonant frequency of the resonant load by sampling frequencies by changing a frequency of the variable signal generator and recording sensor data, and then correlating the collected sensor data (minima) to the resonance.

The application discloses a three-phase interleaved boost converter based on coupled inductance, which comprises a three-phase boost circuit and a three-winding coupled inductance; the three-phase boost circuit comprises three parallel boost sub-circuits; the three-winding coupled inductance comprises three mutually coupled regulating inductances, which are electrically connected with the boost sub-circuits in correspondence. The application combines the coupled inductance with the three-phase DC / DC boost circuit, fully utilizes the parasitic parameters of the coupled inductance, and realizes the ZVS (Zero Voltage Switching) of the main switch and passive current sharing. Compared with the traditional three-phase interleaved converter, the application realizes the ZVS of the switch with the least number of components, greatly reduces the problems such as EMI (Electromagnetic Interference), saves the cost, solves the problem of uneven current distribution of the three-phase parallel converter, effectively reduces the current stress of the device, and is very suitable for high-power LED driving occasions.

The application discloses a kind of soft switching DC-AC converters and control circuit based on single module four-tube Buck-Boost, belong to power converter technical field, including first switch tube, second switch tube, third switch tube, fourth switch tube, first resistance, first inductance, first capacitor, the first end of first switch tube is connected with the first end of first resistance, the second end of first switch tube is connected with the first end of second switch tube and the first end of first inductance, the second end of second switch tube is connected with the second end of fourth switch tube and the second end of first capacitor, the second end of first resistance is connected with the first end of third switch tube and the first end of first capacitor, the second end of third switch tube is connected with the second end of first inductance and the first end of fourth switch tube, the voltage of both ends of first resistance is output voltage.The application can realize zero voltage switching of all switch tubes under constant switching frequency, can reduce loss, improve economic benefit.

The invention discloses a passive auxiliary soft switching power amplifier based on hybrid ZVS (Zero Voltage Switching) / ZCS (Zero Voltage Switching). The passive auxiliary soft switching power amplifier comprises a double-direct-current voltage module, a double-resonant capacitor and resonant inductor passive soft switching network, a midpoint double-path parallel bridge arm, a double-switching tube high-frequency main power output bridge arm, a double-parallel auxiliary capacitor and an LC filtering output network. The passive auxiliary device adopted by the invention is simple, an additional auxiliary switch tube and a driving module are not needed, and the control complexity is greatly reduced; the design that the resonant inductor is connected in series with the midpoint bridge arm avoids the direct connection risk of the bridge arm fundamentally, dead time does not need to be set, and the operation reliability is improved; meanwhile, a hardware condition is created for realizing hybrid ZVS / ZCS for the full-switching tube, so that the switching loss is reduced, the heat loss of the whole machine is reduced due to the low-loss characteristic of the passive network, the heat dissipation design can be simplified, and the service life of the device can be prolonged; and the network structure is simple, small in size and easy to integrate.