29 results about "Synchronous rectifier" patented technology

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

The application relates to a critical conduction mode control method of a totem-pole PFC converter, which utilizes energy equivalence to determine the resonance process of inductor current at switching commutation, carries out totem-pole Boost inductor current value estimation, and on this basis, utilizes a current zero-crossing point prediction algorithm to calculate the turn-on and turn-off time to generate corresponding active tube-synchronous rectifier tube commutation dead time T d,f , synchronous rectification conduction time T SR , rectifier tube-active tube commutation dead time T d,r ; the PWM drive signals of high-speed switching tubes Q1 and Q2 are generated by T on , T d,f , T SR , T d,r ; the power frequency drive signals of low-speed switching tubes Q3 and Q4 are generated by comparing the input alternating voltage v ac with a hysteresis comparison loop and 0. The method can effectively get rid of the dependence on a current zero-crossing detection circuit and a current sensor, reduces the cost and improves the system stability.

This application provides a multi-output flyback converter and power supply system, relating to the field of power supply technology. The multi-output flyback converter includes a control module, a transformer, a primary-side switching module, and multiple synchronous rectifier modules. The primary-side switching module is connected to the primary winding of the transformer, and each synchronous rectifier module is connected to each secondary winding of the transformer. Each synchronous rectifier module includes two back-to-back connected switching transistors. The control module is connected to the control terminals of the primary-side switching module, the control terminals of the two switching transistors in each synchronous rectifier module, and the output terminal of each synchronous rectifier module. The control module is used to adjust the duty cycle of the primary-side switching module according to the actual output voltage of the actively regulated output path; and to adjust the duty cycle of the switching transistors in each non-actively regulated output path according to the actual output voltage of each non-actively regulated output path, thereby eliminating cross-regulation between the outputs.

This invention proposes a synchronous rectification controller suitable for power conversion circuits. The synchronous rectification controller includes a first terminal, a second terminal, and a switch detection unit. The first terminal is coupled to the primary side of the power conversion circuit. The second terminal is coupled to the secondary side of the power conversion circuit. The switch detection unit, coupled to the first terminal, detects the switching of the primary side of the power conversion circuit. When the switch detection unit detects a trigger signal, it drives the second terminal to send a synchronization signal, thereby controlling the secondary side of the power conversion circuit.

This invention provides a flyback power supply, a synchronous rectification control circuit, and a method, comprising: a turn-on control module for generating a turn-on control signal for the synchronous rectifier; a turn-off control module for generating a turn-off control signal for the synchronous rectifier when the drain-source voltage of the synchronous rectifier rises to a turn-off threshold, and simultaneously adjusting the turn-off threshold based on the peak value of the drain-source voltage of the synchronous rectifier; and a drive signal generation module for generating a drive signal for the synchronous rectifier based on the turn-on control signal and the turn-off control signal; wherein the turn-off threshold is a negative value. This invention automatically adjusts the turn-off threshold according to the drain-source voltage of the synchronous rectifier, solving the voltage stress problem caused by common operation in continuous mode, enabling the system to operate safely and efficiently in continuous mode; simultaneously, it achieves maximum conduction time in discontinuous mode, resulting in high system efficiency; furthermore, this invention reduces the comparator delay requirement and eliminates the need for specific processing of the primary-side control drive, making it simple and easy to implement.

This utility model relates to the field of power supply technology, specifically to a synchronous rectification and commutation power supply. It includes a housing, inside which a battery is fixedly installed, with two electrode plates connected to the battery. It also includes a lap plate fixedly installed inside the housing and positioned inside the electrode plates. Furthermore, it includes an adjusting component movably connected to the housing, capable of moving up and down within the housing. Two frames are fixedly installed on the adjusting component, with metal plates movably connected inside the frames. Additionally, it includes two metal sheets laid on the inner wall of the housing, and two lap plates also disposed on the inner wall. Through the adjusting component and metal plates, a simple and rapid commutation operation can be achieved under the drive of a hydraulic cylinder. Furthermore, by using through slots and magnetic switches on the lap plates, and employing methods such as increased creepage clearance and power-off, arcing during commutation is avoided, improving the safety of the power supply.

This invention relates to the field of switching power supply and detection circuit technology, specifically to a detection circuit and method for detecting the operating status of a synchronous rectifier-encapsulated chip. The circuit includes: a main circuit comprising a main switching transistor and a freewheeling unit, wherein the freewheeling unit is composed of multiple synchronous rectifier-encapsulated chips connected in series, with its tail end connected to the source of the main switching transistor at a common switching node, and its head end grounded; and a status monitoring circuit comprising a conduction voltage drop sampling branch and a status monitoring signal conversion branch, both connected via an optocoupler. The input of the sampling branch is connected to the switching node, and the output, after optocoupler conversion, is output as a detection voltage by the signal conversion branch. This invention solves the problem of difficulty in detecting the conduction state of a synchronous rectifier-encapsulated chip when the gate is not brought out. By utilizing the characteristics of optocouplers, it achieves the signal detection function for the weak negative voltage drop during the conduction period of the synchronous rectifier-encapsulated chip, providing an accurate and non-invasive means of discrimination for yield control, aging monitoring, and system redundancy protection.

A power converter includes two control switches, two synchronous rectifier switches, two inductors, a voltage detector that detects a voltage across one of the control switches, and a controller that controls each switch to shift on and off phases of one of the control switches and one of the synchronous rectifier switches by 180° from on and off phases of the other control switch and the other synchronous rectifier switch. The controller determines the on-time of the target synchronous rectifier switch in accordance with the voltage across the one control switch after a lapse of a predetermined time period since turn-off of the one synchronous rectifier switch, and determines the on-time of the other synchronous rectifier switch as the determined on-time of the target synchronous rectifier switch.

The application discloses a current mode staggered control converter and a control chip, wherein the converter comprises a VIN input power supply with a voltage of 20V-100V, forward transformers T1 and T2, two output paths formed by the transformers and subsequent devices, a capacitor C0 as a VCC pin filter capacitor, a resistor R3 as an RT pin resistor connected to the ground and used for controlling the frequency of an oscillator, capacitors C1 and C2 as COMP1 and COMP2 pin capacitors connected to the ground and used for adjusting loop stability, capacitors C3 and C4 as SS1 and SS2 pin capacitors connected to the ground and used for realizing soft start of the system, N3 and N4 as natural synchronous rectifier devices in the forward converter, the first output channel and the second output channel adopting the same structure, an auxiliary winding La providing power supply for an IC control chip VCC through a diode D1, and an output capacitor Cout1 as an output capacitor of the first channel. The whole system is driven and controlled by only one control chip, and the power density is improved, the volume of the scheme is reduced, the cost of the scheme is lowered, and the system performance is not sacrificed.

A wireless power transfer device is disclosed. In the wireless power transfer device (1), power is wirelessly transferred from the primary side (2) to the secondary side (3) across an air gap (8) by means of a primary resonator (6) that generates a magnetic field (9) and a secondary resonator (10) that receives power by picking up the magnetic field (9). The secondary side (3) includes an output stage (11) that receives AC power provided by the secondary resonator (10) and generates a DC output (13) to be provided to a load. A current sensing device (18) senses the AC current flowing from the secondary resonator (10) to the output stage (11) and provides a current sensing signal (16) to a power transfer controller (15), which controls the power transfer of the wireless power transfer device (1) based on the current sensing signal (16). Furthermore, the current sensing signal (16) is provided to the switch controller (20), which controls the switching of the synchronous rectifier of the output stage (11), which converts the AC power (12) provided by the secondary resonator (10) into DC output (13).

The utility model discloses a low -power feedback switching power supply relates to the field of electronic circuit. Including input module, control module, voltage transformation module, feedback module and output module. Input module contains lightning protection temperature control and filter rectifier circuit, realizes the lightning protection, filter and rectification to external power supply, control module integration starts, the feedback of original side, overcurrent monitoring and switching circuit, is the control core of power supply, voltage transformation module passes through transformer and peak current absorption circuit, realizes the safe transformation of voltage, feedback module utilizes the combination of photocoupler and voltage stabilizer, real -time acquisition output voltage and feedback to control module, output module adopts synchronous rectifier circuit, and cooperates filter capacitor and common mode inductance, realizes high -efficient rectification and filter. The utility model discloses through synchronous rectification technology reduction conduction loss, combines the adaptive feedback system fast adjustment duty cycle, and the power efficiency and output voltage stability are improved significantly, have high reliability, low loss, response speed fast and so on advantage.

The application discloses a control method and device for realizing phase-shift full-bridge light-load soft switching, equipment and a storage medium, relates to the technical field of vehicle-mounted power supply, and the method comprises: the method comprises: obtaining current operation parameters of a DC-DC converter; determining the advance conduction time of a synchronous rectifier according to the current operation parameters; controlling the switch tube in the original side circuit to perform phase-shift control based on a phase-shift control signal; and controlling the synchronous rectifier to conduct in advance during the zero-crossing period of the secondary side current according to the advance conduction time in the control period of the phase-shift control signal, so as to increase the current of the original side resonant inductor, and enable the lagging bridge arm switch tube in the original side circuit to realize zero-voltage turn-on in the dead time. Compared with the prior art, the application realizes zero-voltage turn-on of the lagging bridge arm under light load without increasing hardware conditions, reduces switching loss, improves light load efficiency and EMI performance by controlling the secondary side synchronous rectifier to conduct in advance to increase the original side current.

This utility model discloses a low-power water-cooled rectifier power supply, including a chassis with a heat sink installed inside. Transformer assemblies and synchronous rectifier modules are mounted on both sides of the heat sink. The transformer assembly includes a magnetic core, which is horizontally mounted above the synchronous rectifier module. Heat sinks are mounted on both the top and bottom of one end of the heat sink, and IGBT modules are mounted on both heat sinks. The heat sink and heat sinks form a gradient thermal bridging structure. This utility model uses an integrated magnetic core, which not only reduces the size but also reduces magnetic leakage by more than 10%. It also employs a copper-aluminum gradient thermal bridging structure, indirectly connecting the IGBT module and the heat sink via heat sinks, changing the heat conduction mode and making it unaffected by water temperature, thus solving the condensation problem. Simultaneously, the copper heat sink acts as a high thermal conductivity zone, making close contact with the IGBT module, while the aluminum heat sink expands the heat dissipation area, resulting in a 60% reduction in thermal resistance.

The application discloses a synchronous rectification controller applied to a power converter and a starting method of the synchronous rectification controller in a starting stage. The synchronous rectification controller is coupled with a rectification switch of a secondary side of the power converter, and the rectification switch comprises a rectification switch control end, a rectification switch first end and a rectification switch second end. The synchronous rectification controller comprises a driving signal end, a power supply receiving end, a transistor and a starting control module. The power supply receiving end receives a working voltage, and when the working voltage is higher than a working voltage threshold value, the synchronous rectification controller can output a driving signal for driving the rectification switch through the driving signal end. The starting control module limits a cross voltage between the rectification switch control end and the rectification switch second end to be lower than a first threshold voltage of the rectification switch based on the working voltage being lower than the working voltage threshold value through conduction of the transistor.

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.

This invention provides a switching power supply and a method for using it. The switching power supply provided by this invention is used to charge a device, and includes: a secondary-side synchronous rectifier chip configured to output a temperature protection request message when the chip's body temperature is detected to be higher than a first preset threshold; and a primary-side feedback chip configured to enter an automatic restart state in response to receiving the temperature protection request message. According to the above technical solution, the secondary-side synchronous rectifier chip can be used to detect its body temperature, and when an excessively high temperature is detected, it sends a temperature protection request message to the primary-side feedback chip, causing the primary-side feedback chip to enter an automatic restart state, preventing excessively high secondary-side temperatures that could lead to problems such as fuselage.

This utility model relates to the field of pulse width modulation (PWM) technology and provides an output synchronous rectified PWM signal control and driving circuit, including an oscillation control circuit, a shaping drive circuit, an output drive circuit, and an interlock control circuit. The oscillation control circuit is electrically connected to the shaping drive circuit and is used to correct the waveform of the transformer signal. The interlock control circuit is also electrically connected to the shaping drive circuit and is used to control the cutoff and turn-on of the power MOSFETs at the positive and negative output terminals of the interlock transformer. The shaping drive circuit is electrically connected to the output drive circuit and is used to reduce the internal losses of the main power MOSFETs. The output drive circuit is also electrically connected to the shaping drive circuit and is used to improve the operating efficiency of the output synchronous rectifier circuit. This utility model reduces the internal losses of the main power MOSFETs, improves the operating efficiency of the output synchronous rectifier circuit, and enhances the overall power conversion efficiency and electrical performance of the rectifier module.

This invention discloses a synchronous rectification control method for an LLC resonant converter, applicable to an LLC resonant converter composed of an inverter circuit, an LLC resonant cavity, a transformer, and a secondary-side rectifier network. This synchronous rectification control method achieves reliable switching of the synchronous rectifier diodes across the entire voltage range based on the feedback voltage signals of the LLC resonant converter under different operating modes. Especially during mode switching, by first uniformly turning off the drive signals of each synchronous rectifier diode and then gradually soft-starting them with a smaller pulse width, the method avoids the energy backflow problem caused by mis-turning of the secondary-side synchronous rectifier diodes during mode switching, achieving smooth and reliable switching between modes. The synchronous rectification control method proposed in this invention has higher practicality and reliability, requires no additional hardware circuitry, can be directly implemented through controller software programming, and offers greater flexibility, extending to synchronous rectification control schemes under a wider voltage range and more modes.

This disclosure provides a multi-port charger, a flyback converter, and its secondary-side control circuit and control method. The secondary-side control method includes: determining the load state of the flyback converter; under light load conditions, starting a timer when the secondary-side freewheeling ends, and after a certain time, distinguishing between the free oscillation stage and the primary-side conduction stage based on a first volt-second product; and enabling switching to different output voltages after the primary-side conduction stage. The first volt-second product represents the product of the voltage difference when the synchronous rectifier is turned off and the time, where the voltage difference is the difference between the drain-source voltage of the synchronous rectifier and the output voltage. This disclosure, under light load conditions, filters out the large first volt-second product at the beginning of the free oscillation stage by setting a timer, thereby accurately distinguishing between the free oscillation stage and the primary-side conduction stage after the timer expires, and thus providing an effective output switching enable signal to enable switching to different output voltages after the primary-side conduction stage.

This invention discloses a method and circuit for controlling the synchronous rectifier diodes in a dual-clamp converter. The method obtains the total equivalent resonant inductance and clamping capacitor on the primary side by constructing a simplified model of the equivalent circuit during the power transfer stage; it designs the total equivalent damping resistance to be greater than the critical damping resistance, enabling the converter to operate in an overdamped state; it designs the minimum on-time of the synchronous rectifier drive to be greater than the critical damping rise time; and it calculates the turn-off compensation voltage based on the rated output voltage, transformer turns ratio, and magnetizing inductance, and sets the turn-off threshold voltage accordingly. This invention effectively suppresses inductive voltage component interference caused by package parasitic inductance, avoids premature turn-off of the synchronous rectifier diodes, reduces conduction losses, and improves converter efficiency and output voltage control accuracy. It also has advantages such as simple parameter adjustment and strong versatility.

The utility model discloses a kind of control circuit of multi-port ultra-thin charger, it is related to charger technical field, including EMI circuit, first filter circuit, planar transformer, synchronous rectifier circuit, second filter circuit, feedback circuit, PWM control circuit, first TYPE-C interface control circuit, voltage reduction circuit, second TYPE-C interface control circuit;First filter circuit is connected between EMI circuit and PWM control circuit;Planar transformer is connected with PWM control circuit;PWM control circuit is connected with feedback circuit;Synchronous rectifier circuit is connected between planar transformer and second filter circuit;Feedback circuit, first TYPE-C interface control circuit and voltage reduction circuit are connected with second filter circuit;Second TYPE-C interface control circuit is connected with voltage reduction circuit, first TYPE-C interface control circuit;Synchronous rectifier circuit includes synchronous rectification control chip U1 and MOS tube Q1.The utility model has the beneficial effect: it can satisfy charger charging efficient, charging stable, compatibility is strong and the design requirement of small and exquisite volume.

This disclosure provides a multi-port charger, a flyback converter, and their control circuit and control method. The control circuit includes: a primary-side control circuit for generating a primary-side control signal to control the main power transistor to turn on or off; and a secondary-side control circuit for generating a synchronous rectification control signal to control the synchronous rectifier transistor to turn on or off, and generating an output switching enable signal to control the n-channel output circuit to switch and output different output voltages during the secondary-side freewheeling phase. This disclosure avoids the technical problem of overvoltage stress caused by the output switching enable being later than the freewheeling turn-on or earlier than the freewheeling turn-off, and achieves a low-cost, simple, and reliable multi-port charger and flyback converter.

This utility model discloses a transformer structure and its water-cooled rectifier power supply, including a transformer assembly. A synchronous rectifier module is disposed on the left or right side of the transformer assembly, and the transformer assembly has at least two secondary sides. The synchronous rectifier module is electrically connected to the two secondary sides of the transformer assembly, respectively. Several absorption modules are stacked on the synchronous rectifier module via copper pillars, and the absorption modules are electrically connected to the synchronous rectifier module. A drive module is also disposed on the synchronous rectifier module, and the drive module is electrically connected to the synchronous rectifier module. This utility model optimizes the structure of the synchronous rectifier module, achieving full-wave rectification function with a single novel synchronous rectifier module, saving production costs and improving material utilization. Simultaneously, the installation position of the synchronous rectifier module has been changed; by placing the synchronous rectifier module on the left or right arm of the magnetic core, the influence of eddy currents is avoided.

A method for operating a DC-to-DC converter with a primary full-bridge rectifier and a secondary synchronous rectifier for a motor vehicle includes detecting an input voltage of the synchronous rectifier, an output voltage of the synchronous rectifier, and an output power of the synchronous rectifier; determining a switch event with a falling signal edge per switch element of the DC-to-DC converter and a switch element of the synchronous rectifier; ascertaining a delay of the falling signal edge of the switch element of the synchronous rectifier using the input voltage, the output voltage, and the output power; and outputting a control signal in order to shift the signal edge of the switch element of the synchronous rectifier according to the delay.

This application discloses a detection method, a detection circuit, and a synchronous rectifier chip. The detection method is applied to a synchronous rectifier chip. The detection method includes: detecting whether the light-load function of the synchronous rectifier chip is enabled, obtaining a first detection result; detecting whether the slope of the drive pulse signal emitted from the power supply terminal of the synchronous rectifier chip decreasing from a first threshold to a second threshold meets a preset condition, obtaining a second detection result; determining whether the drive pulse signal is abnormal based on the first and second detection results; if the drive pulse signal is abnormal within a preset time after the light-load function is disabled, controlling the switch controlled by the synchronous rectifier chip to turn off; if the drive pulse signal is normal within a preset time after the light-load function is disabled, controlling the switch controlled by the synchronous rectifier chip to turn on. This application can accurately determine whether the drive pulse signal is abnormal after the light-load function of the synchronous rectifier chip is disabled, avoiding the accidental turning on of the switch controlled by the synchronous rectifier chip.

This invention discloses an LLC synchronous rectification control method, apparatus, device, and storage medium. The method includes acquiring resonance parameters and determining the resonance frequency and resonance period; determining the steady-state operating frequency based on the highest frequency of the MOSFET in the LLC resonant converter; determining the operating region of the LLC resonant converter based on the resonance frequency and the operating frequency; and controlling the on-time of the secondary-side synchronous rectifier diode of the LLC resonant converter based on the operating region. This invention determines the operating region by using the resonance frequency and the operating frequency, and then controls the on-time of the secondary-side synchronous rectifier diode, ensuring that the secondary-side synchronous rectifier diode turns off before the primary-side switch when operating in region II, thereby avoiding reverse current flow on the secondary side in region II and effectively improving the efficiency of the LLC resonant converter. Moreover, the control method of this invention is simple and clear, requiring only the implementation of the synchronous rectification timing described in the invention, without the need for additional detection circuitry.

A spike absorption circuit, a spike absorption method, and a switching power supply are disclosed. The spike absorption circuit, applied in a switching converter, includes: a clamping transistor; a clamping capacitor connected in series with the clamping transistor and then connected to a synchronous rectifier to form a closed loop; and a clamping control module. After the main power transistor is turned on, the module detects the drain-source voltage of the clamping transistor, times a first time interval from when the drain-source voltage of the clamping transistor falls below a first threshold to when it rises above a second threshold, and controls the clamping transistor to conduct for a second time interval from the end of the time interval until the main power transistor is turned off. This precisely limits the charging and discharging time of the clamping capacitor, allowing it to absorb the voltage spike generated on the synchronous rectifier when the main power transistor is turned on during the first time interval, and recover the absorbed energy to the input terminal during the second time interval. This reduces stress on the secondary side, ensures system safety, reduces absorption losses, and improves system efficiency.

The application discloses an LLC full-bridge synchronous rectification control method. In each half cycle of alternating voltage, a rectifier driving control signal is sent to an output full-bridge synchronous rectification network of an LLC resonant converter. The output full-bridge synchronous rectification network comprises two pairs of diagonal conduction synchronous rectifier pairs, and the rectifier driving control signal is used for turning on one synchronous rectifier in the synchronous rectifier pair corresponding to the current half cycle state. In the case that one synchronous rectifier in the synchronous rectifier pair is in the on state, the other synchronous rectifier remains off and completes the freewheeling by using its body diode. The application can solve the current backflow problem from the root, and effectively improve the operation reliability and working efficiency of the converter.