Power supply circuit, power supply control method and electronic equipment

Abstract

The present application discloses a power supply circuit, a power supply control method and an electronic device, wherein the main control circuit in the power supply circuit is used to detect the voltage effective value and voltage instantaneous value of the AC input signal of the AC power supply and the DC output signal output by the rectifier circuit to the load circuit, so as to generate a first control signal based on the DC output signal, and in response to the voltage effective value being lower than the first threshold range, generate a second control signal according to the voltage effective value, the voltage instantaneous value and the first control signal; the inverter circuit receives the first control signal, the switch regulation circuit receives the second control signal, and adjusts the short-circuit state of the secondary winding based on the second control signal, so as to utilize the primary winding and the secondary winding to enhance the energy storage of the resonant circuit, and utilize the energy storage to extend the holding time of the DC output signal within the second threshold range. Through the above-mentioned method, the power supply circuit of the present application can effectively realize power-off retention, and the implementation cost is low, the volume is small, and the energy loss is low.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply circuit, a power supply control method and an electronic device. Background Art

[0002] Nowadays, in the actual application of power supply circuits, there is usually a need for power-off retention or low-voltage input compensation, that is, when the input voltage provided by the power supply circuit to the load end drops, the load end needs to maintain the current working voltage for a certain period of time to complete the necessary work in time within the voltage retention period. Especially with the increasing use of server power supplies, various industries have higher and higher requirements for server power supply performance indicators, especially the power-off retention time of server power supplies is getting longer and longer.

[0003] However, the existing power-off retention or low-voltage input compensation methods usually adopt increasing the storage capacitor in the power supply circuit, or the voltage when the storage capacitor is discharged. However, when the capacitance value increases, the cost and volume of the power supply circuit will also increase in direct proportion, which is contrary to the trend of miniaturization and cost saving in the market; when increasing the capacitor voltage during discharge, in the case of low voltage output, it is generally necessary to add a boost circuit to increase the input voltage to a voltage level that is sufficient for the circuit to store energy to cope with the voltage output retention time. The volume and cost of the power supply circuit will also increase significantly, and due to the increase in the working voltage, the requirements for the rated voltage specifications of the entire power circuit components are also higher, which also increases energy loss during long-term operation, reduces efficiency, and increases additional costs. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a power supply circuit, a power supply control method and an electronic device, which can solve the problems of high implementation cost and large size of the power supply circuit in the prior art, increased energy loss during long-term operation, reduced efficiency and increased additional costs.

[0005] In order to solve the above technical problems, a technical solution adopted in the present application is: to provide a power supply circuit, wherein the power supply circuit includes: a power factor correction circuit, an inverter circuit, a resonant circuit, an isolation transformer, a switch regulation circuit, a rectifier circuit and a main control circuit, and the isolation transformer includes a primary winding and a secondary winding; wherein the power factor correction circuit is used to couple with an AC power supply, the inverter circuit is coupled with the power factor correction circuit, the resonant circuit and the main control circuit, the resonant circuit is coupled with the primary winding, the primary winding is coupled with the secondary winding, the switch regulation circuit is coupled with the secondary winding, the rectifier circuit and the main control circuit, and the rectifier circuit is used to couple with a load circuit; the main control circuit is used to detect the AC power provided by the AC power supply The voltage effective value and voltage instantaneous value of the input signal and the DC output signal output by the rectifier circuit to the load circuit are used to generate a first control signal based on the DC output signal, and in response to the voltage effective value being lower than the first threshold range, a second control signal is generated according to the voltage effective value, the voltage instantaneous value and the first control signal; the inverter circuit is used to receive the first control signal to change the switch state under the action of the first control signal; the switch regulation circuit is used to receive the second control signal and adjust the short-circuit state of the secondary winding based on the second control signal, so as to utilize the primary winding and the secondary winding to increase the energy storage of the resonant circuit, and utilize the energy storage of the resonant circuit to extend the retention time of the DC output signal within the second threshold range.

[0006] Wherein, the inverter circuit includes a first switch subcircuit and a second switch subcircuit, the secondary winding includes one or more unit secondary windings, the switch regulation circuit includes one or more fifth switch subcircuits, the number of unit secondary windings is equal to the number of fifth switch subcircuits, the first switch subcircuit is coupled to the second switch subcircuit, the power factor correction circuit, the resonant circuit and the main control circuit, each unit secondary winding is coupled to the primary winding and coupled to a fifth switch subcircuit, and each fifth switch subcircuit is coupled to the main control circuit; wherein, the first control signal includes a first drive signal and a second drive signal, and the main control circuit is also used to detect the voltage phase of the AC input signal, so as to send a voltage phase to the first switch subcircuit in the positive half cycle of the voltage of the AC input signal when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is lower than the third threshold range. A first drive signal is sent, and a second control signal is generated by using the first drive signal to send the second control signal to one or part of the fifth switch sub-circuit, the first drive signal and the second control signal are in phase, or the rising edge of the second control signal lags behind the first set time length of the first drive signal, and the falling edge of the second control signal leads the first drive signal The second set time length; and / or, in the negative half cycle of the voltage of the AC input signal, a second drive signal is sent to the second switch sub-circuit, and a second control signal is generated by using the second drive signal to send the second control signal to one or another part of the fifth switch sub-circuit, the second drive signal and the second control signal are in phase, or the rising edge of the second control signal lags behind the first set time length of the second drive signal, and the falling edge of the second control signal leads the second set time length of the second drive signal.

[0007] Wherein, the inverter circuit includes a first switch subcircuit and a second switch subcircuit, the secondary winding includes a first sub-secondary winding and a second sub-secondary winding connected in series, the switch regulation circuit includes a third switch subcircuit and a fourth switch subcircuit, the first switch subcircuit is coupled to the second switch subcircuit, the power factor correction circuit, the resonant circuit and the main control circuit, the first sub-secondary winding and the second sub-secondary winding are both coupled to the primary winding, and coupled to the third switch subcircuit and the fourth switch subcircuit, and the third switch subcircuit and the fourth switch subcircuit are coupled to the main control circuit; wherein the first control signal includes a first drive signal and a second drive signal, and the second control signal includes a third drive signal The main control circuit sends the first drive signal to the first switch sub-circuit when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is higher than the fourth threshold range, and generates the fourth drive signal by using the first drive signal to send the fourth drive signal to the fourth switch sub-circuit, and sends the second drive signal to the second switch sub-circuit, and generates the third drive signal by using the second drive signal to send the third drive signal to the third switch sub-circuit, the first drive signal is opposite in phase to the second drive signal and has the same phase as the fourth drive signal, the second drive signal has the same phase as the third drive signal, or the rising edge of the fourth drive signal lags behind The first drive signal has a first set time length, the falling edge of the fourth drive signal precedes the second set time length of the first drive signal, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal precedes the second set time length of the second drive signal; or, the main control circuit is further used to detect the voltage phase of the AC input signal, so as to send the first drive signal to the first switch sub-circuit in the positive half cycle of the voltage of the AC input signal when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is lower than the third threshold range, and generate the fourth drive signal using the first drive signal, so as to send the fourth drive signal to the fourth switch sub-circuit, The first drive signal has the same phase as the fourth drive signal, or the rising edge of the fourth drive signal lags behind the first drive signal for a first set time length, and the falling edge of the fourth drive signal precedes the first drive signal for a second set time length; and / or, in the negative half cycle of the voltage of the AC input signal, the second drive signal is sent to the second switch sub-circuit, and the second drive signal is used to generate a third drive signal to send the third drive signal to the third switch sub-circuit, the second drive signal has the same phase as the third drive signal, or the rising edge of the third drive signal lags behind the second drive signal for a first set time length, and the falling edge of the third drive signal precedes the second drive signal for a second set time length.

[0008] Wherein, the switch regulation circuit also includes a first energy storage subcircuit and a second energy storage subcircuit, the first energy storage subcircuit is coupled to the third switch subcircuit, and the second energy storage subcircuit is coupled to the fourth switch subcircuit; wherein, the main control circuit is also used to send a fourth drive signal to the fourth switch subcircuit in the positive half cycle of the voltage of the AC input signal to trigger the fourth switch subcircuit to be turned on, so that the second energy storage subcircuit can store energy; and / or, in the negative half cycle of the voltage of the AC input signal, send a third drive signal to the third switch subcircuit to trigger the third switch subcircuit to be turned on, so that the first energy storage subcircuit can store energy.

[0009] Among them, the first switch subcircuit includes a first switch tube, the second switch subcircuit includes a second switch tube, the third switch subcircuit includes a third switch tube, and the fourth switch subcircuit includes a fourth switch tube; wherein, the first end of the first switch tube is coupled to the first end of the power factor correction circuit and the first end of the resonant circuit, the second end of the first switch tube is coupled to the first end of the second switch tube and the third end of the resonant circuit, the second end of the second switch tube is coupled to the second end of the power factor correction circuit and the second end of the resonant circuit, the first end of the third switch tube is coupled to the first end of the first sub-secondary winding and the first end of the rectifier circuit, the second end of the third switch tube is coupled to the first end of the fourth switch tube, the second end of the first sub-secondary winding and the first end of the second sub-secondary winding, the second end of the fourth switch tube is coupled to the second end of the second sub-secondary winding and the second end of the rectifier circuit, and the third end of each of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube is coupled to the main control circuit.

[0010] In which, the power supply circuit also includes a switch freewheeling circuit, which includes a first freewheeling resistor, a second freewheeling resistor, a first freewheeling capacitor, a second freewheeling capacitor, a first diode, and a second diode; wherein the first end of the first freewheeling resistor is coupled to the first end of the first switch tube and the second end of the first diode, the second end of the first freewheeling resistor is coupled to the first end of the first freewheeling capacitor, the second end of the first freewheeling capacitor is coupled to the second end of the second diode, the second end of the first switch tube, the first end of the second switch tube, the first end of the second freewheeling resistor, and the second end of the second diode, the second end of the second freewheeling resistor is coupled to the first end of the second freewheeling capacitor, and the second end of the second freewheeling capacitor is coupled to the second end of the second switch tube and the first end of the second diode.

[0011] The resonant circuit includes a first resonant capacitor, a second resonant capacitor, a resonant inductor and a resonant resistor, the rectifier circuit includes a third diode and a fourth diode, and the power supply circuit also includes a voltage-stabilizing output circuit, and the voltage-stabilizing output circuit includes a voltage-stabilizing resistor and a voltage-stabilizing capacitor; wherein the first end of the first resonant capacitor is coupled to the first end of the first freewheeling resistor, the first end of the first switch tube and the second end of the first diode, the second end of the first resonant capacitor is coupled to the first end of the second resonant capacitor and the second end of the primary winding, the second end of the second resonant capacitor is coupled to the second end of the first freewheeling capacitor, the second end of the second switch tube and the first end of the second diode, the first end of the resonant inductor is coupled to the second end of the first freewheeling capacitor, the second end of the second diode, the second end of the first switch tube, the second end of the second switch tube The first end of the resonant inductor is coupled to the first end of the resonant resistor, and the second end of the resonant resistor is coupled to the first end of the primary winding; the first end of the third diode is coupled to the first end of the third switch tube, the first end of the first sub-secondary winding, the second end of the third diode is coupled to the second end of the fourth diode, the first end of the stabilizing resistor and the first end of the load circuit, the first end of the fourth diode is coupled to the second end of the fourth switch tube, the second end of the second sub-secondary winding, the second end of the stabilizing resistor is coupled to the first end of the stabilizing capacitor, and the second end of the stabilizing capacitor is coupled to the second end of the third switch tube, the first end of the fourth switch tube, the second end of the first sub-secondary winding, the first end of the second sub-secondary winding and the second end of the load circuit.

[0012] The main control circuit includes a sampling circuit, a first proportional filter correction circuit, a second proportional filter correction circuit, a signal processing circuit and a driving circuit. The sampling circuit is coupled to the power factor correction circuit, the rectifier circuit, the first proportional filter correction circuit and the second proportional filter correction circuit. The signal processing circuit is coupled to the first proportional filter correction circuit, the second proportional filter correction circuit and the driving circuit. The driving circuit is coupled to the inverter circuit and the switch regulation circuit. The sampling circuit samples and obtains the AC input signal in the power factor correction circuit and the DC output signal in the rectifier circuit. The first proportional filter correction circuit receives the AC input signal, and filters and corrects the AC input signal in sequence to obtain the first filtered signal. The second proportional filter correction circuit receives the DC output signal, and filters and corrects the DC output signal in sequence to obtain the second filtered signal. The signal processing circuit is used to receive the first filtered signal and the second filtered signal, so as to control the driving circuit to generate the first control signal based on the second filtered signal, and in response to the voltage effective value of the first filtered signal being lower than the first threshold range, the driving circuit is controlled to generate the second control signal according to the voltage effective value, the voltage instantaneous value of the first filtered signal and the first control signal.

[0013] To solve the above technical problems, another technical solution adopted in the present application is: to provide a power supply control method, which includes: receiving an AC input signal sent by an external AC power supply; converting the AC input signal into a first DC signal; converting the first DC signal into a second AC signal; adjusting the second AC signal; converting the adjusted second AC signal into a third AC signal; converting the third AC signal into a DC output signal to output to an external load circuit; generating a first control signal based on the DC output signal; adjusting the second AC signal using the first control signal; in response to the effective value of the voltage of the AC input signal being lower than a first threshold range, generating a second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the AC input signal and the first control signal; and using the second control signal to enhance the second AC signal, so as to use the enhanced second AC signal to extend the retention time of the DC output signal within the second threshold range.

[0014] The first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, and in response to the effective value of the voltage of the AC input signal being lower than the first threshold range, the step of generating the second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the AC input signal and the first control signal includes: in response to the effective value of the voltage being lower than the first threshold range and the instantaneous value of the voltage being higher than the fourth threshold range, generating the fourth drive signal using the first drive signal; generating the third drive signal using the second drive signal; wherein the first drive signal is opposite in phase to the second drive signal and has the same phase as the fourth drive signal, the second drive signal is the same in phase as the third drive signal, or the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, the falling edge of the fourth drive signal leads the second set time length of the first drive signal, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal; the step of boosting the second AC signal using the second control signal includes: boosting the second AC signal using the third drive signal and the fourth drive signal.

[0015] The first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and / or a fourth drive signal, and in response to the effective value of the voltage of the AC input signal being lower than the first threshold range, the step of generating the second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the AC input signal and the first control signal includes: in response to the effective value of the voltage of the AC input signal being lower than the first threshold range, the instantaneous value of the voltage being lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal, generating the fourth drive signal using the first drive signal; wherein the first drive signal and the fourth drive signal have the same phase, or the first drive signal and the fourth drive signal have the same phase. The rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, and the falling edge of the fourth drive signal leads the first drive signal by a second set time length; and / or, in the negative half cycle of the voltage of the AC input signal, the third drive signal is generated by using the second drive signal; wherein the second drive signal and the third drive signal have the same phase, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal; the step of using the second control signal to enhance the second AC signal includes: using the third drive signal and / or the fourth drive signal to enhance the second AC signal.

[0016] In order to solve the above technical problems, another technical solution adopted in the present application is: to provide an electronic device, wherein the electronic device includes a shell and a power circuit connected to the shell; wherein the power circuit is the power circuit as described in any one of the above items.

[0017] The beneficial effects of the present application are as follows: Different from the prior art, the main control circuit in the power supply circuit provided by the present application is used to detect the voltage effective value and voltage instantaneous value of the AC input signal provided by the AC power supply and the DC output signal output by the rectifier circuit to the load circuit, so as to generate a first control signal based on the DC output signal, and in response to the voltage effective value being lower than the first threshold range, generate a second control signal according to the voltage effective value, the voltage instantaneous value and the first control signal; the inverter circuit receives the first control signal to change the switch state under the action of the first control signal; the switch regulation circuit receives the second control signal, and adjusts the short-circuit state of the secondary winding in the isolation transformer based on the second control signal, so as to utilize the primary winding and the secondary winding in the isolation transformer to increase the energy storage of the resonant circuit, and utilize the energy storage of the resonant circuit to extend the holding time of the DC output signal within the second threshold range, thereby effectively realizing power-off retention, and the implementation cost is low, the volume is small, the circuit is simple, the response speed is fast, the circuit control is simpler, and the power-off delay is longer; in addition, the circuit energy loss is effectively reduced during the long-term operation of the power supply circuit, and the power supply efficiency and reliability are improved, avoiding additional costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a structural schematic diagram of the first embodiment of the power supply circuit of the present application;

[0020] Figure 2 is a structural schematic diagram of a second embodiment of the power supply circuit of the present application;

[0021] Figure 3 yes Figure 2 A schematic diagram of a voltage waveform of an AC input signal provided by an AC power source;

[0022] Figure 4 yes Figure 2 A schematic diagram of waveforms of a first control signal and a second control signal corresponding to a first control mode adopted by a central control circuit;

[0023] Figure 5 yes Figure 2 A schematic diagram of waveforms of a first control signal and a second control signal corresponding to a second control mode adopted by the central main control circuit;

[0024] Figure 6 yes Figure 2 A schematic diagram of waveforms of a first control signal and a second control signal corresponding to a third control mode adopted by the central main control circuit;

[0025] Figure 7 is a structural schematic diagram of a third embodiment of the power supply circuit of the present application;

[0026] Figure 8 It is a flow chart of an implementation method of a power supply control method of the present application;

[0027] Fig. 9 It is a flow chart of the second implementation method of the power control method of the present application;

[0028] Fig.10 It is a flowchart of three implementation methods of the power control method of the present application;

[0029] Fig.11 It is a schematic diagram of the framework of an implementation scheme of the electronic device of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the implementation mode of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0032] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0034] See also Figure 1 , Figure 1 1 is a schematic diagram of the structure of the first embodiment of the power supply circuit of the present application. In this embodiment, the power supply circuit 10 includes: a power factor correction circuit 11, an inverter circuit 12, a resonant circuit 13, an isolation transformer 14, a switch regulation circuit 15, a rectifier circuit 16 and a main control circuit 17.

[0035] Among them, a power supply circuit 10 provided in the present application is specifically used in the power supply of a load circuit 102 that requires a DC output, so as to utilize the AC power provided by an external AC power supply 101 to convert the AC power into DC power, so as to provide it to the load circuit 102 in any reasonable electronic device such as a server, a computer, an intelligent communication device, etc., and this embodiment does not impose any restrictions on this.

[0036] It is worth noting that the AC power supply 101 can be specifically understood as a city power supply, a photovoltaic AC power supply or an independent generator, or an AC power supply output after power conversion and adjustment of the city power supply, photovoltaic AC power supply, an independent generator or any other reasonable upper power supply. The load circuit 102 can be understood as a signal function circuit that uses the DC output of the power supply circuit 10 to operate.

[0037] In addition, the term "coupled" herein refers to any direct and indirect connection means. Therefore, if the first circuit is described as being coupled to the second circuit, it means that the first circuit can be directly connected to the second circuit through electrical connection or signal connection methods such as wireless transmission, optical transmission, etc., or can be indirectly connected to the second circuit through other circuits or connection means.

[0038] Specifically, the power factor correction circuit 11 is used to couple with the AC power supply 101, the inverter circuit 12 is coupled with the power factor correction circuit 11, the resonant circuit 13 and the main control circuit 17, the resonant circuit 13 is coupled with the primary winding 141, the primary winding 141 is coupled with the secondary winding 142, the switching regulation circuit 15 is coupled with the secondary winding 142, the rectifier circuit 16 and the main control circuit 17, and the rectifier circuit 16 is used to couple with the load circuit 102, so as to be able to use the power factor correction circuit 11, the inverter circuit 12, the resonant circuit 13, the isolation transformer 14, the switching regulation circuit 15, the rectifier circuit 16 in sequence, and use the main control circuit 17 to adjust the switching states of the inverter circuit 12 and the switching regulation circuit 15, so as to convert the AC input signal provided by the AC power supply 101 into a DC output signal, so as to output it to the load circuit 102, so as to drive the load circuit 102 to work.

[0039] Among them, the main control circuit 17 is used to continuously monitor the AC input signal from the AC power supply 101, including the voltage effective value and voltage instantaneous value of the AC input signal. At the same time, the main control circuit 17 is also used to monitor the DC output signal output by the rectifier circuit 16 to the load circuit 102 to ensure that the output voltage meets the working requirements of the load circuit 102. The main control circuit 17 specifically generates a first control signal based on the state of the DC output signal, which is used to preliminarily adjust the working state of the inverter circuit 12 to control the inverter circuit 12 to effectively realize the conversion of DC to AC. When it is detected that the voltage effective value of the AC input signal is lower than the set first threshold range, the main control circuit 17 will comprehensively judge and generate a second control signal based on the current voltage effective value, voltage instantaneous value and the first control signal, so as to adjust the working state of the switch regulation circuit 15.

[0040] It is worth noting that the effective value of the voltage refers to the root mean square value of the voltage in one cycle. For a sinusoidal voltage, its effective value is equal to its maximum value divided by the square root of 2; the instantaneous value of the voltage refers to the current value of the voltage at a specific moment.

[0041] In addition, the first threshold range can be understood as the threshold range of the effective value of the voltage of the AC input signal output by the power supply when the AC power supply 101 maintains normal operation, so that when it is detected that the current effective value of the voltage of the AC input signal is lower than the set first threshold range, it can be determined that the AC power supply 101 has a power outage. The first threshold range can be specifically determined by the actual application scenario, and this application does not limit this.

[0042] Optionally, the first control signal and the second control signal may specifically be one or more of any reasonable control signals such as a PWM (Pulse Width Modulation) signal or a PFM (Pulse Frequency Modulation) signal, and the present application does not limit this.

[0043] Optionally, the main control circuit 17 may specifically include a control chip, an MCU (Micro Controller Unit) circuit, a CPU (Central Processing Unit), a single-chip microcomputer, a field programmable gate array, a programmable logic device, a discrete gate or transistor logic device, discrete hardware, and any other reasonable circuit unit with a signal processing function, and the present application does not limit this.

[0044] Specifically, the inverter circuit 12 can be any reasonable circuit form for realizing DC to AC conversion, such as a full-bridge inverter circuit 12, a symmetrical half-bridge circuit or an asymmetrical half-bridge circuit, to receive the first control signal sent by the main control circuit 17, and adopt any reasonable motor drive control strategy such as SVPWM (Space Vector Pulse Width Modulation), SPWM (Sinusoidal Pulse Width Modulation), DTC (Direct torque control) or FOC (Field-Oriented Control), etc., to change the switch state under the action of the first control signal, and adjust and control the current, voltage and frequency of the DC signal received from the power factor correction circuit 11 to convert it into a corresponding AC signal. This application does not limit this.

[0045] Furthermore, the switching regulation circuit 15 is used to receive a second control signal and adjust the short-circuit state of the secondary winding 142 in the isolation transformer 14 based on the second control signal, such as short-circuiting at least part of the secondary winding 142, or adjusting the time ratio between at least part of the secondary winding 142 being short-circuited and not short-circuited, so as to regulate the current of the AC signal on one side of the primary winding 141 in the isolation transformer 14.

[0046] It is worth noting that a short circuit on the secondary side of the transformer will cause the current on the primary side of the transformer to increase instantly, and the number of turns flowing through the transformer will decrease. Therefore, after a short circuit on the secondary side occurs, an overcurrent phenomenon will occur on the primary side of the transformer.

[0047] It can be seen from this that by adjusting the short-circuit state of the secondary winding 142, the current of the AC signal on the primary winding 141 side of the isolation transformer 14 can be effectively increased, so that when the AC power supply 101 loses power, the primary winding 141 and the secondary winding 142 can be used to effectively increase the current flowing through the resonant circuit 13, so as to increase the energy storage in the resonant circuit 13, so that when the AC power supply 101 loses power and the AC input signal gradually decays, the increased energy storage of the resonant circuit 13 can be effectively used to discharge the load circuit 102 through the isolation transformer 14, the switching regulation circuit 15, and the rectifier circuit 16, so as to extend the retention time of the DC output signal within the second threshold range.

[0048] It is worth noting that the second threshold range can be understood as the voltage and current threshold range when the load circuit 102 maintains normal operation, and the specific range can be determined by the actual application scenario, and the present application does not limit this.

[0049] It is understandable that in the operation of some special load circuits 102, such as when one or more of any reasonable circuit units such as storage media and memory circuit elements are integrated, in order to avoid irreparable losses such as cache failure and data loss caused by power interruption, when the power supply of the load circuit 102 stops supplying power, it is necessary to maintain the power output provided to the load circuit 102 for a certain period of time, that is, to effectively maintain the DC output signal within the second threshold range for a period of time, so as to complete the necessary work in time within the voltage maintenance time period.

[0050] The above scheme increases the energy storage of the resonant circuit 13 when the AC power supply 101 loses power, so as to utilize the energy storage of the resonant circuit 13 to extend the retention time of the DC output signal within the second threshold range, thereby effectively realizing the power-off retention of the load circuit 102, and has low implementation cost, small size, simple circuit, fast response speed, simpler circuit control, and long power-off delay; in addition, during the long-term operation of the power supply circuit 10, the circuit energy loss is effectively reduced, the power supply efficiency and reliability are improved, and additional costs are avoided.

[0051] In one embodiment, when the AC power supply 101 maintains normal operation, that is, when the voltage effective value of the AC input signal is within the first threshold range, the power factor correction circuit 11 is specifically used to receive the AC input signal sent by the AC power supply 101, and convert the AC input signal into a first DC signal, but it will be accompanied by an industrial frequency ripple within 5%; the inverter circuit 12 is used to receive the first DC signal sent by the power factor correction circuit 11, and convert the first DC signal into a second AC signal, which can specifically be a square wave AC; the resonant circuit 13 receives the second AC signal sent by the inverter circuit 12, and resonates and regulates the second AC signal; the primary winding 141 of the isolation transformer 14 receives the regulated second AC signal sent by the resonant circuit 13, so as to utilize the secondary winding 141 to generate a second AC signal. The coupling effect of the winding 142 converts the regulated second AC signal into a third AC signal; the switch regulation circuit 15 is used to receive the third AC signal sent by the secondary winding 142 and maintain the secondary winding 142 not short-circuited, that is, the main control circuit 17 does not send the second control signal to the switch regulation circuit 15, and the switch regulation circuit 15 is in an open state to send the third AC signal to the rectifier circuit 16; the rectifier circuit 16 receives the third AC signal sent by the switch regulation circuit 15, and converts the third AC signal into a DC output signal, which can specifically be a steamed bun wave, and then rectified by the load circuit 102 or the bus capacitor in the power supply circuit 10 into a set DC voltage signal, which is output to the load circuit 102 to drive the load circuit 102 to work.

[0052] It is understandable that when the AC power supply 101 loses power, the main control circuit 17 specifically uses the second control signal to adjust the short-circuit state of the secondary winding 142 to enhance the second AC signal flowing through the resonant circuit 13 to enhance the energy storage in the resonant circuit 13, thereby being able to utilize the enhanced second AC signal to extend the time that the DC output signal is maintained within the second threshold range.

[0053] In one embodiment, the main control circuit 17 can specifically compare the currently acquired DC output signal with a preset power supply threshold, and determine the signal frequency and / or duty cycle of the first control signal based on the comparison difference between the DC output signal and the preset power supply threshold, and then send the first control signal to the inverter circuit 12 according to the currently determined signal frequency and / or duty cycle, triggering the inverter circuit 12 to adjust its switching state, so as to adjust the second AC signal corresponding to the output of the inverter circuit 12, and then adjust the DC output signal.

[0054] It is worth noting that the DC output signal includes a current signal and a voltage signal. The preset power supply threshold can be specifically understood as the target power supply requirement of the load circuit 102, such as the target setting value of the voltage, current or power of the power supply output currently required by the load circuit 102, which can also be understood as a preset target power supply signal.

[0055] The main control circuit 17 specifically utilizes the difference between the DC output signal and the preset power supply threshold to dynamically adjust the signal frequency of the second control signal. For example, when it is determined that the DC output signal is less than the preset power supply threshold, the current signal frequency and / or duty cycle of the first control signal is increased, and when it is determined that the DC output signal is greater than the preset power supply threshold, the current signal frequency and / or duty cycle of the second control signal is decreased, until the DC output signal is adjusted to the target setting value of the voltage, current or power, that is, within the range of the preset power supply threshold, and the signal frequency and / or duty cycle of the first control signal currently in a stable state is determined.

[0056] In one embodiment, the inverter circuit 12 further includes a first switch sub-circuit (not shown) and a second switch sub-circuit (not shown), and the secondary winding 142 includes one or more unit secondary windings (not shown), and the switch regulation circuit 15 includes one or more fifth switch sub-circuits (not shown), and the number of unit secondary windings is equal to the number of fifth switch sub-circuits, the first switch sub-circuit is coupled to the second switch sub-circuit, the power factor correction circuit 11, the resonant circuit 13 and the main control circuit 17, each unit secondary winding is coupled to the primary winding 141, and is coupled to a fifth switch sub-circuit, and each fifth switch sub-circuit is coupled to the main control circuit 17.

[0057] The first control signal specifically includes a first drive signal and a second drive signal. The main control circuit 17 is also used to detect the voltage phase of the AC input signal to determine whether the AC input signal is in the positive half cycle of the voltage or the positive and negative cycle of the voltage.

[0058] Specifically, when the main control circuit 17 detects that the effective value of the voltage of the AC input signal is lower than the first threshold range, and the instantaneous value of the voltage of the AC input signal is lower than the third threshold range, specifically in the positive half-cycle of the voltage of the AC input signal, it sends a first drive signal to the first switch sub-circuit, and uses the first drive signal to generate a second control signal to send a second control signal to one or part of the fifth switch sub-circuit, thereby short-circuiting a portion of the secondary winding 142 connected to the five switch sub-circuits that receive the second control signal, so as to increase the energy storage of the resonant circuit 13, and then use the increased energy storage in the resonant circuit 13 to extend the retention time of the DC output signal within the second threshold range.

[0059] The first drive signal and the second control signal have the same phase, or the rising edge of the second control signal lags behind the first drive signal by a first set time length, and the falling edge of the second control signal precedes the first drive signal by a second set time length.

[0060] It is worth noting that the first set duration can be specifically determined according to the delay time of the first switch subcircuit triggering conduction; the second set duration can be determined according to the delay time of the first switch subcircuit triggering shutdown, and this application does not limit this.

[0061] Furthermore, in another embodiment, in the negative half cycle of the voltage of the AC input signal, the main control circuit 17 can specifically send a second drive signal to the second switch sub-circuit, and use the first drive signal to generate a second control signal to send a second control signal to one or another part of the fifth switch sub-circuit, thereby short-circuiting a portion of the secondary winding 142 connected to the five switch sub-circuit that receives the second control signal, so as to increase the energy storage of the resonant circuit 13, and then use the increased energy storage in the resonant circuit 13 to extend the retention time of the DC output signal within the second threshold range.

[0062] The second drive signal and the second control signal have the same phase, or the rising edge of the second control signal lags behind the first set time length of the second drive signal, and the falling edge of the second control signal precedes the second set time length of the second drive signal.

[0063] Optionally, the number of the fifth switch sub-circuit may be any reasonable number such as 1, 2, 3 or 5, and the present application does not impose any limitation on this.

[0064] It is worth noting that, in this embodiment, when the secondary winding 142 includes a unit secondary winding and the number of the fifth switch sub-circuit is one, the main control circuit 17 may specifically not distinguish between the negative and positive voltage cycles and the negative voltage half-cycle of the AC input signal, so as to generate a second control signal using the first drive signal or the second drive signal, and adjust the time proportion of the secondary winding 142 to achieve short circuit based on the duty cycle of the first drive signal or the second drive signal, so as to increase the current of the AC signal on the primary winding 141 side, thereby increasing the energy storage of the resonant circuit 13.

[0065] In addition, when the secondary winding 142 includes multiple unit secondary windings and the number of the fifth switch sub-circuit is multiple, the main control circuit 17 specifically sends a first drive signal to the first switch sub-circuit in the positive half cycle of the voltage of the AC input signal, and uses the first drive signal to generate a second control signal to send a second control signal to part of the fifth switch sub-circuit; wherein, the part of the fifth switch sub-circuit specifically refers to the part of the secondary winding 142 connected to the part of the fifth switch sub-circuit. After short-circuiting, the voltage polarity converted from one side of the secondary winding 142 to one end of the resonant circuit 13 is opposite to the voltage polarity output to the other end of the resonant circuit 13 by the AC input signal through the power factor correction circuit 11 and the inverter circuit 12, so as to increase the energy storage voltage at both ends of the resonant circuit 13, thereby improving the energy storage of the resonant circuit 13.

[0066] Similarly, in the negative half cycle of the voltage of the AC input signal, the main control circuit 17 sends a second drive signal to the second switch sub-circuit, and uses the second drive signal to generate a second control signal to send a second control signal to another part of the fifth switch sub-circuit; wherein, the other part of the fifth switch sub-circuit specifically refers to the part of the secondary winding 142 connected to the other part of the fifth switch sub-circuit. After short-circuiting, the voltage polarity converted from one side of the secondary winding 142 to one end of the resonant circuit 13 is opposite to the voltage polarity output to the other end of the resonant circuit 13 by the AC input signal through the power factor correction circuit 11 and the inverter circuit 12, so as to increase the energy storage voltage at both ends of the resonant circuit 13, thereby improving the energy storage of the resonant circuit 13.

[0067] For the convenience of explanation, the number of the fifth switch sub-circuit is multiple, and according to the characteristics of the above-mentioned part of the fifth switch sub-circuit and another part of the fifth switch sub-circuit, the multiple fifth switch sub-circuits are divided into two categories, each category has at least one, and the number can be the same or different, such as the fifth switch sub-circuit n1, the fifth switch sub-circuit n2, the fifth switch sub-circuit m1, and the fifth switch sub-circuit m2 as examples, wherein, in the positive half cycle of the voltage of the AC input signal, when the fifth switch sub-circuit n1 and the fifth switch sub-circuit n2 are triggered to turn on, the secondary winding The voltage polarity converted from one side of 142 to one end of the resonant circuit 13 is opposite to the voltage polarity outputted from the AC input signal to the other end of the resonant circuit 13 via the power factor correction circuit 11 and the inverter circuit 12; in the negative half cycle of the voltage of the AC input signal, when the fifth switch sub-circuit m1 and the fifth switch sub-circuit m2 are triggered to turn on, the voltage polarity converted from one side of the secondary winding 142 to one end of the resonant circuit 13 is opposite to the voltage polarity outputted from the AC input signal to the other end of the resonant circuit 13 via the power factor correction circuit 11 and the inverter circuit 12.

[0068] It can be known that, in the positive half cycle of the voltage of the AC input signal, the main control circuit 17 can specifically send a second control signal to one or more of the fifth switch sub-circuit n1 and the fifth switch sub-circuit n2; and / or, in the negative half cycle of the voltage of the AC input signal, the main control circuit 17 can specifically send a second control signal to one or more of the fifth switch sub-circuit m1 and the fifth switch sub-circuit m2; other quantities and classifications can be obtained similarly, which will not be repeated here.

[0069] See also Figure 2 , Figure 2 The power circuit in this embodiment differs from the first embodiment of the power circuit provided in this application in that the inverter circuit 22 in the power circuit 20 further includes a first switch subcircuit 221 and a second switch subcircuit 222 .

[0070] Among them, the secondary winding 242 in the isolation transformer 24 also includes a first sub-secondary winding 2421 and a second sub-secondary winding 2422 connected in series, and the switch regulation circuit 25 further includes a third switch sub-circuit 251 and a fourth switch sub-circuit 252. The first switch sub-circuit 221 is coupled to the second switch sub-circuit 222, the power factor correction circuit 21, the resonant circuit 23 and the main control circuit 27. The first sub-secondary winding 2421 and the second sub-secondary winding 2422 are both coupled to the primary winding 241, and coupled to the third switch sub-circuit 251 and the fourth switch sub-circuit 252. The third switch sub-circuit 251 and the fourth switch sub-circuit 252 are coupled to the main control circuit 27.

[0071] Please continue reading Figure 3 and Figure 4,in, Figure 3 yes Figure 2 Schematic diagram of the voltage waveform of the AC input signal provided by the AC power supply. Figure 4 yes Figure 2 Schematic diagram of waveforms of a first control signal and a second control signal corresponding to a first control mode adopted by a central control circuit.

[0072] Specifically, the first control signal includes a first drive signal PWMA and a second drive signal PWMB, the second control signal includes a third drive signal PWM1 and a fourth drive signal PWM2, and the frequencies of the first drive signal PWMA, the second drive signal PWMB, the third drive signal PWM1, and the fourth drive signal PWM2 are much greater than the frequency of the AC input signal Vac, and the periods are much smaller than the period of the AC input signal Vac.

[0073] Specifically, when the main control circuit 27 detects that the effective value of the voltage of the AC input signal Vac is lower than the first threshold range, that is, the AC power supply 101 is powered off, and the instantaneous value of the voltage of the AC input signal Vac is higher than the fourth threshold range, the first drive signal PWMA is sent to the first switch sub-circuit 221, and the first drive signal PWMA is used to generate the fourth drive signal PWM2, so as to send the fourth drive signal PWM2 to the fourth switch sub-circuit 252, thereby triggering the fourth switch sub-circuit 252 to short-circuit the two ends of the second sub-secondary winding 2422, that is, Figure 2 The node N2 and the node N3 are short-circuited to increase the current on the primary winding 241 , that is, the current flowing through the resonant circuit 23 , so as to increase the energy storage of the resonant circuit 23 .

[0074] At the same time, the main control circuit 27 is also used to send the second drive signal PWMB to the second switch sub-circuit 222, and use the second drive signal PWMB to generate a third drive signal PWM1 to send the third drive signal PWM1 to the third switch sub-circuit 251, thereby triggering the third switch sub-circuit 251 to turn on, so as to short-circuit the two ends of the first sub-secondary winding 2421, that is, Figure 2 The node N1 and the node N2 are short-circuited to further increase the energy storage of the resonant circuit 23, and then the increased energy storage in the resonant circuit 23 is used to extend the holding time of the DC output signal Vo within the second threshold range.

[0075] Among them, the first drive signal PWMA corresponds to the second drive signal PWMB with a phase opposite thereto, and has the same phase as the fourth drive signal PWM2, and the second drive signal PWMB has the same phase as the third drive signal PWM1; or, the rising edge of the fourth drive signal PWM2 lags behind the first drive signal PWMA for a first set time length Tr1, and the falling edge of the fourth drive signal PWM2 leads the first drive signal PWMA for a second set time length Td1, and the rising edge of the third drive signal PWM1 lags behind the second drive signal PWMB for a first set time length Tr1, and the falling edge of the third drive signal PWM1 leads the second drive signal PWMB for a second set time length Td1.

[0076] Please continue reading Figure 5 , Figure 5 yes Figure 2 Schematic diagram of waveforms of the first control signal and the second control signal corresponding to the second control mode adopted by the central main control circuit.

[0077] In another embodiment, the main control circuit 27 is further used to detect the voltage phase of the AC input signal Vac to determine whether the AC input signal Vac is in the positive half cycle of the voltage or the positive and negative cycle of the voltage, and when it is detected that the effective value of the voltage of the AC input signal Vac is lower than the first threshold range, that is, the AC power supply 101 is powered off, and the instantaneous value of the voltage is lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal Vac, the first drive signal PWMA is sent to the first switch sub-circuit 221, and the first drive signal PWMA is used to generate a fourth drive signal PWM2, so as to send the fourth drive signal PWM2 to the fourth switch sub-circuit 252, so as to short-circuit the two ends of the second sub-secondary winding 2422, that is, Figure 2 The node N2 and the node N3 are short-circuited to increase the current on the primary winding 241 side, that is, the current flowing through the resonant circuit 23, so as to increase the energy storage of the resonant circuit 23, and then use the increased energy storage in the resonant circuit 23 to extend the retention time of the DC output signal Vo within the second threshold range.

[0078] The first drive signal PWMA and the fourth drive signal PWM2 have the same phase; or, the rising edge of the fourth drive signal PWM2 lags behind the first drive signal PWMA by a first set time length Tr1, and the falling edge of the fourth drive signal PWM2 precedes the first drive signal PWMA by a second set time length Td1.

[0079] Please continue reading Figure 6 , Figure 6 yes Figure 2 Schematic diagram of waveforms of the first control signal and the second control signal corresponding to the third control mode adopted by the central main control circuit.

[0080] In another embodiment, the main control circuit 27 is further used to detect the voltage phase of the AC input signal Vac to determine whether the AC input signal Vac is in the positive half cycle of the voltage or the positive and negative cycle of the voltage, and when it is detected that the effective value of the voltage of the AC input signal Vac is lower than the first threshold range, that is, the AC power supply 101 is powered off, and the instantaneous value of the voltage is lower than the third threshold range, in the negative half cycle of the voltage of the AC input signal Vac, the second drive signal PWMB is sent to the second switch sub-circuit 222, and the third drive signal PWM1 is generated by using the second drive signal PWMB to send the third drive signal PWM1 to the third switch sub-circuit 251 to short-circuit the two ends of the first sub-secondary winding 2421, that is, Figure 2 The node N1 and the node N2 are short-circuited to increase the current on the primary winding 241 side, that is, the current flowing through the resonant circuit 23, so as to increase the energy storage of the resonant circuit 23, and then use the increased energy storage in the resonant circuit 23 to extend the holding time of the DC output signal Vo within the second threshold range.

[0081] The second driving signal PWMB has the same phase as the third driving signal PWM1; or, the rising edge of the third driving signal PWM1 lags behind the second driving signal PWMB by a first set time length Tr1, and the falling edge of the third driving signal PWM1 precedes the second driving signal PWMB by a second set time length Td1.

[0082] Furthermore, in one embodiment, the first switch subcircuit 221 includes a first switch tube T1, the second switch subcircuit 222 includes a second switch tube T2, the third switch subcircuit 251 includes a third switch tube T3, and the fourth switch subcircuit includes a fourth switch tube T4.

[0083] Among them, the first end of the first switch tube T1 is coupled to the first end of the power factor correction circuit 21 and the first end of the resonant circuit 23, the second end of the first switch tube T1 is coupled to the first end of the second switch tube T2 and the third end of the resonant circuit 23, the second end of the second switch tube T2 is coupled to the second end of the power factor correction circuit 21 and the second end of the resonant circuit 23, the first end of the third switch tube T3 is coupled to the first end of the first sub-secondary winding 2421 and the first end of the rectifier circuit 26, the second end of the third switch tube T3 is coupled to the first end of the fourth switch tube T4, the second end of the first sub-secondary winding 2421 and the first end of the second sub-secondary winding 2422, and the second end of the fourth switch tube T4 is coupled to the second end of the second sub-secondary winding 2422 and the second end of the rectifier circuit 26.

[0084] The third end of each of the first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 is coupled to the main control circuit 27 to receive the first drive signal PWMA, the second drive signal PWMB, the third drive signal PWM1 and the fourth drive signal PWM2 respectively sent by the main control circuit 27, and trigger the first end and the second end to be turned on or off under the action of the first drive signal PWMA, the second drive signal PWMB, the third drive signal PWM1 and the fourth drive signal PWM2 respectively, so that the two ends of the first sub-secondary winding 2421 can be short-circuited and / or the two ends of the second sub-secondary winding 2422 can be short-circuited by using the on-off control of the third switch tube T3 and the fourth switch tube T4, so as to increase the current on one side of the primary winding 241, that is, the current flowing through the resonant circuit 23, so as to increase the energy storage of the resonant circuit 23, and then use the increased energy storage in the resonant circuit 23 to extend the holding time of the DC output signal Vo within the second threshold range.

[0085] Optionally, the first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 can be specifically a MOS (Metal Oxide Semiconductor Field Effect Transistor) tube, a triode, a thin film transistor or a field effect transistor or any other reasonable switch tube, which is not limited in the present application.

[0086] It is worth noting that, in order to distinguish the two ends of each switch tube except the control end, one of the ends is called the first end and the other end is called the second end. When each switch tube is a triode, the control end, that is, the third end, can be specifically the base, the first end is the collector, and the second end is the emitter; or, the third end can also be specifically the base, the first end is the emitter, and the second end is the collector.

[0087] When the above switch tubes are MOS tubes, thin film transistors or field effect transistors, the third end can be a gate, the first end is a drain, and the second end is a source; or, the third end can be a gate, the first end is a source, and the second end is a drain.

[0088] When each switch tube is a MOS tube, a thin film transistor or a field effect transistor, it can also be a composite transistor or a single transistor, which is not limited in the present application.

[0089] In other embodiments, the inverter circuit 22 may be a full-bridge circuit, a symmetrical half-bridge circuit, an asymmetrical half-bridge circuit, or any other reasonable circuit form for converting DC to AC, and the present application does not limit this.

[0090] In one embodiment, the power circuit 20 further includes a switch freewheeling circuit 28 , which includes a first freewheeling resistor Rc1 , a second freewheeling resistor Rc2 , a first freewheeling capacitor C1 , a second freewheeling capacitor C2 , a first diode D1 , and a second diode D2 .

[0091] Among them, the first end of the first freewheeling resistor Rc1 is coupled to the first end of the first switch tube T1 and the second end of the first diode D1, the second end of the first freewheeling resistor Rc1 is coupled to the first end of the first freewheeling capacitor C1, the second end of the first freewheeling capacitor C1 is coupled to the second end of the second diode D2, the second end of the first switch tube T1, the first end of the second switch tube T2, the first end of the second freewheeling resistor Rc2, and the second end of the second diode D2, the second end of the second freewheeling resistor Rc2 is coupled to the first end of the second freewheeling capacitor C2, and the second end of the second freewheeling capacitor C2 is coupled to the second end of the second switch tube T2 and the first end of the second diode D2.

[0092] It can be understood that by setting the switch freewheeling circuit 28, when the first switch tube T1 or the second switch tube T2 is triggered to turn off, the first diode D1 or the second diode D2 can be used to provide a freewheeling channel for the current flowing through the first switch tube T1 or the second switch tube T2, and with the help of the first freewheeling resistor Rc1, the second freewheeling resistor Rc2, the first freewheeling capacitor C1, and the second freewheeling capacitor C2, the ZVS (Zero Voltage Switch) is effectively turned on and off, thereby effectively ensuring the efficient and stable power supply performance of the entire power supply circuit 20.

[0093] It is worth mentioning that ZVS turn-on is a soft switching technology commonly used in switching power supplies. It achieves zero voltage turn-on by reducing the voltage to zero before the switch tube is turned on, so as to reduce switching losses and electromagnetic interference.

[0094] Furthermore, in one embodiment, the resonant circuit 23 specifically further includes a first resonant capacitor Cr1, a second resonant capacitor Cr2, a resonant inductor Lr and a resonant resistor Rr.

[0095] Among them, the first end of the first resonant capacitor Cr1 is coupled to the first end of the first freewheeling resistor Rc1, the first end of the first switch tube T1 and the second end of the first diode D1, the second end of the first resonant capacitor Cr1 is coupled to the first end of the second resonant capacitor Cr2 and the second end of the primary winding 241, the second end of the second resonant capacitor Cr2 is coupled to the second end of the first freewheeling capacitor C1, the second end of the second switch tube T2 and the first end of the second diode D2, the first end of the resonant inductor Lr is coupled to the second end of the first freewheeling capacitor C1, the second end of the second diode D2, the second end of the first switch tube T1, the first end of the second switch tube T2, the first end of the second freewheeling resistor Rc2 and the second end of the second diode D2, the second end of the resonant inductor Lr is coupled to the first end of the resonant resistor Rr, and the second end of the resonant resistor Rr is coupled to the first end of the primary winding 241.

[0096] It is worth mentioning that the resonant circuit 23 is a circuit that can selectively amplify and transmit signals. It can maximize the amplitude of signals at a specific frequency while suppressing interference signals at other frequencies. This circuit is widely used in wireless communication systems, sound amplification, video processing and other fields, and its main functions are: 1. Signal amplification: The resonant circuit 23 can maximize the amplitude of signals at a specific frequency, thereby amplifying them. For example, the amplifier used in the radio works based on the resonance principle. 2. Signal enhancement: The resonant circuit 23 can enhance the signal within a specified frequency range through selective amplification, thereby improving signal quality and transmission efficiency. 3. Signal selection: The resonant circuit 23 can selectively transmit signals of a specific frequency, suppress interference signals of other frequencies, and ensure signal clarity.

[0097] In one embodiment, the rectifier circuit 26 specifically further includes a third diode D3 and a fourth diode D4, and the power supply circuit 20 specifically further includes a voltage-stabilizing output circuit 29, and the voltage-stabilizing output circuit 29 further includes a voltage-stabilizing resistor Ro and a voltage-stabilizing capacitor Co.

[0098] Among them, the first end of the third diode D3 is coupled to the first end of the third switch tube T3 and the first end of the first sub-secondary winding 2421, the second end of the third diode D3 is coupled to the second end of the fourth diode D4, the first end of the voltage-stabilizing resistor Ro and the first end of the load circuit 102, the first end of the fourth diode D4 is coupled to the second end of the fourth switch tube T4 and the second end of the second sub-secondary winding 2422, the second end of the voltage-stabilizing resistor Ro is coupled to the first end of the voltage-stabilizing capacitor Co, and the second end of the voltage-stabilizing capacitor Co is coupled to the second end of the third switch tube T3, the first end of the fourth switch tube T4, the second end of the first sub-secondary winding 2421, the first end of the second sub-secondary winding 2422 and the second end of the load circuit 102.

[0099] In other embodiments, the rectifier circuit 26 may be a full-bridge rectifier circuit or a half-bridge rectifier circuit composed of switch tubes, or any other reasonable circuit form for converting AC to DC, and the present application does not limit this.

[0100] It can be understood that the rectifier circuit 26 is specifically used to receive the third AC signal sent by the switching regulation circuit 25, and convert the third AC signal into a DC output signal Vo, which can be a steamed bun wave, and then use the stabilizing resistor Ro and the stabilizing capacitor Co to rectify the DC output signal Vo into a set DC voltage signal to output to the load circuit 102, so as to drive the load circuit 102 to work.

[0101] In one embodiment, the main control circuit 27 specifically further includes a sampling circuit (not shown), a first proportional filter correction circuit 271, a second proportional filter correction circuit 272, a signal processing circuit 273 and a drive circuit 274. The sampling circuit is coupled to the power factor correction circuit 21, the rectifier circuit 26, the first proportional filter correction circuit 271 and the second proportional filter correction circuit 272. The signal processing circuit 273 is coupled to the first proportional filter correction circuit 271, the second proportional filter correction circuit 272 and the drive circuit 274. The drive circuit 274 is coupled to the inverter circuit 22 and the switch regulation circuit 25.

[0102] Among them, the sampling circuit is used to sample and obtain the AC input signal Vac in the power factor correction circuit 21 and the DC output signal Vo in the rectifier circuit 26; the first proportional filter correction circuit 271 receives the AC input signal Vac, and compares, filters, and corrects the AC input signal with a reference value in turn to obtain a first filtered signal; the second proportional filter correction circuit 272 receives the DC output signal Vo, and compares, filters, and corrects the DC output signal Vo with a reference value in turn to obtain a second filtered signal, so as to provide high-quality input for the signal processing circuit 273, thereby optimizing the overall performance and reliability of the main control circuit 27, and effectively realizing efficient control.

[0103] Specifically, the signal processing circuit 273 is used to receive a first filtered signal and a second filtered signal to control the driving circuit 274 to generate a first control signal based on the second filtered signal, and in response to the effective voltage value of the first filtered signal being lower than a first threshold range, further control the driving circuit 274 to generate a second control signal based on the effective voltage value, the instantaneous voltage value of the first filtered signal and the first control signal.

[0104] See also Figure 7 , Figure 7The power circuit in this embodiment differs from the second embodiment of the power circuit provided in this application in that the switch regulating circuit 35 in the power circuit 30 further includes a first energy storage subcircuit 353 and a second energy storage subcircuit 354 .

[0105] The first energy storage sub-circuit 353 is correspondingly coupled to the third switch sub-circuit 351 , and the second energy storage sub-circuit 354 is coupled to the fourth switch sub-circuit 352 .

[0106] The main control circuit 37 is also specifically used to detect the voltage of the DC output signal Vo output by the rectifier circuit 36 ​​to the load circuit 102, so as to send a fourth drive signal PWM2 to the fourth switch sub-circuit 352 in the positive half cycle of the voltage of the AC input signal Vac when it is determined that the voltage effective value of the AC input signal Vac is lower than the first threshold range and the voltage of the DC output signal Vo is lower than the fifth threshold range, so as to trigger the fourth switch sub-circuit 352 to turn on the fourth switch sub-circuit 352 and charge the second energy storage sub-circuit 354, that is, to store energy in the second energy storage sub-circuit 354, so as to extend the retention time of the DC output signal Vo within the second threshold range by utilizing the energy stored in the second energy storage sub-circuit 354.

[0107] It is worth noting that the fifth threshold range can also be understood as the voltage and current threshold range when the load circuit 102 maintains normal operation, and can be the same as the second threshold range, or can be located within the second threshold range, so that when the DC output signal Vo is lower than the fifth threshold range, a quick response is required, and the energy storage in the second energy storage sub-circuit 354 is discharged to the load circuit 102 to maintain the DC output signal Vo within the second threshold range for a period of time, so that the load circuit 102 can complete the necessary work in time within the voltage maintenance time period, which can be determined by the actual application scenario, and the present application does not limit this.

[0108] Furthermore, in another embodiment, when the main control circuit 37 determines that the voltage effective value of the AC input signal Vac is lower than the first threshold range and the voltage of the DC output signal Vo is lower than the fifth threshold range, the main control circuit 37 is also used to send a third drive signal PWM1 to the third switch sub-circuit 351 in the negative half cycle of the voltage of the AC input signal Vac, so as to trigger the third switch sub-circuit 351 to charge the first energy storage sub-circuit 353, that is, to store energy in the first energy storage sub-circuit 353, so that the energy stored in the first energy storage sub-circuit 353 can be used to extend the retention time of the DC output signal Vo within the second threshold range.

[0109] It is worth noting that, in other embodiments, the main control circuit 37 can specifically adopt any one or more of the above-mentioned embodiments of enhancing the energy storage of the resonant circuit 33, superimposed on the energy storage of the first energy storage sub-circuit 353 and / or the energy storage of the second energy storage sub-circuit 354, to jointly achieve power-off retention of the load circuit 102 and effectively extend the power-off retention time, which is not limited in the present application.

[0110] It can be understood that in this embodiment, the power factor correction circuit 31, the inverter circuit 32, the first switch sub-circuit 321, the second switch sub-circuit 322, the resonant circuit 33, the isolation transformer 34, the primary winding 341, the secondary winding 342, the first sub-secondary winding 3421, the second sub-secondary winding 3422, the third switch sub-circuit 351, the fourth switch sub-circuit 352, the rectifier circuit 36, the main control circuit 37, the first proportional filter correction circuit 371, the second proportional filter correction circuit 372, the signal processing circuit 373, the drive circuit 3374, the switch freewheeling circuit 38 and the voltage stabilization output circuit 39 are respectively the same as the power factor correction circuit 21, the inverter circuit 22, the first switch sub-circuit 221, the second switch sub-circuit 222, the resonant circuit 23, the isolation transformer 24, the primary winding 241, the secondary winding 242, the first sub-secondary winding 2421, the second sub-secondary winding 2422, the third switch sub-circuit 251, the fourth switch sub-circuit 252, the rectifier circuit 26, the main control circuit 27, the first proportional filter correction circuit 271, the second proportional filter correction circuit 272, the signal processing circuit 273, the drive circuit 274, the switch freewheeling circuit 28 and the voltage stabilization output circuit 29, for details, please refer to Figure 2-Figure 6 And the related text content will not be repeated here.

[0111] This application also specifically adopts a power control method, see Figure 8 , Figure 8 This is a flow chart of an implementation method of the power control method of the present application. Specifically, it may include the following steps:

[0112] S41: receiving an AC input signal sent by an external AC power source.

[0113] It is understandable that the power control method in this embodiment is specifically a control method in which the power circuit uses the AC power provided by the external AC power supply to convert the AC power into DC power to provide it to the load circuit. The power circuit specifically includes a power factor correction circuit, an inverter circuit, a resonant circuit, an isolation transformer, a switch regulation circuit, a rectifier circuit and a main control circuit. The power factor correction circuit is used to couple with the AC power supply, the inverter circuit is coupled with the power factor correction circuit, the resonant circuit and the main control circuit, the resonant circuit is coupled with the primary winding, the primary winding is coupled with the secondary winding, the switch regulation circuit is coupled with the secondary winding, the rectifier circuit and the main control circuit, and the rectifier circuit is used to couple with the load circuit.

[0114] Specifically, the power factor correction circuit is used to receive an AC input signal provided by an external AC power source.

[0115] It is worth noting that the AC power supply can be specifically understood as a city power supply, a photovoltaic AC power supply or an independent generator, or an AC power supply output after power conversion and adjustment of the city power supply, photovoltaic AC power supply, an independent generator or any other reasonable upper power supply. The load circuit can be understood as a signal function circuit that uses the DC output of the power supply circuit to operate.

[0116] S42: Convert the AC input signal into a first DC signal.

[0117] Furthermore, the power factor correction circuit converts the AC input signal into a first DC signal, but will be accompanied by an industrial frequency ripple within 5%.

[0118] S43: Convert the first DC signal into a second AC signal.

[0119] The inverter circuit is used to receive a first DC signal sent by a power factor correction circuit and convert the first DC signal into a second AC signal, which can specifically be a square wave AC.

[0120] S44: Adjust the second AC signal.

[0121] The resonant circuit receives a second AC signal sent by the inverter circuit, and performs resonant voltage regulation on the second AC signal.

[0122] S45: Convert the adjusted second AC signal into a third AC signal.

[0123] The primary winding of the isolation transformer receives the regulated second AC signal sent by the resonant circuit, so as to convert the regulated second AC signal into a third AC signal by utilizing the coupling effect with the secondary winding.

[0124] S46: Convert the third AC signal into a DC output signal to output to an external load circuit.

[0125] The switch regulating circuit is used for receiving the third AC signal sent by the secondary winding, maintaining the secondary winding not short-circuited, and sending the third AC signal to the rectifier circuit.

[0126] The rectifier circuit receives the third AC signal sent by the switching regulation circuit and converts the third AC signal into a DC output signal. The DC output signal can specifically be a steamed bun wave, which is then rectified by the bus capacitor in the load circuit or the power supply circuit into a set DC voltage signal to be output to the load circuit to drive the load circuit to work.

[0127] S47: Generate a first control signal based on the DC output signal.

[0128] Specifically, the main control circuit is used to continuously monitor the AC input signal from the AC power supply, including the voltage effective value and voltage instantaneous value of the AC input signal. At the same time, the main control circuit is also used to monitor the DC output signal output by the rectifier circuit to the load circuit to ensure that the output voltage meets the working requirements of the load circuit.

[0129] The main control circuit specifically generates a first control signal based on the state of the DC output signal, which is used to preliminarily adjust the working state of the inverter circuit to control the inverter circuit to effectively convert DC into AC.

[0130] S48: Regulate the second AC signal using the first control signal.

[0131] Among them, the main control circuit can specifically compare the currently obtained DC output signal with the preset power supply threshold, and determine the signal frequency and / or duty cycle of the first control signal based on the comparison difference between the DC output signal and the preset power supply threshold, and then send the first control signal to the inverter circuit according to the currently determined signal frequency and / or duty cycle, triggering the inverter circuit to adjust its switching state, so as to adjust the second AC signal corresponding to the output of the inverter circuit, and then adjust the DC output signal.

[0132] It is worth noting that the DC output signal includes a current signal and a voltage signal. The preset power supply threshold can be specifically understood as the target power supply requirement of the load circuit, such as the target setting value of the voltage, current or power of the power supply output currently required by the load circuit, which can also be understood as a preset target power supply signal.

[0133] The main control circuit specifically utilizes the difference between the DC output signal and the preset power supply threshold to dynamically adjust the signal frequency of the second control signal. For example, when it is determined that the DC output signal is less than the preset power supply threshold, the current signal frequency and / or duty cycle of the first control signal is increased, and when it is determined that the DC output signal is greater than the preset power supply threshold, the current signal frequency and / or duty cycle of the second control signal is decreased, until the DC output signal is adjusted to the target setting value of voltage, current or power, that is, within the range of the preset power supply threshold, and the signal frequency and / or duty cycle of the first control signal currently in a stable state is determined.

[0134] S49: In response to the effective value of the voltage of the AC input signal being lower than the first threshold range, generating a second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the AC input signal and the first control signal.

[0135] Furthermore, when the main control circuit detects that the voltage effective value of the AC input signal is lower than the set first threshold range, it will comprehensively judge and generate a second control signal based on the current voltage effective value, voltage instantaneous value and first control signal to adjust the working state of the switching regulation circuit.

[0136] It is worth noting that the effective value of the voltage refers to the root mean square value of the voltage in one cycle. For a sinusoidal voltage, its effective value is equal to its maximum value divided by the square root of 2; the instantaneous value of the voltage refers to the current value of the voltage at a specific moment.

[0137] In addition, the first threshold range can be understood as the threshold range of the effective value of the voltage of the AC input signal output by the power supply when the AC power supply maintains normal operation, so that when it is detected that the current effective value of the voltage of the AC input signal is lower than the set first threshold range, it can be determined that the AC power supply has a power outage. The first threshold range can be specifically determined by the actual application scenario, and this application does not limit this.

[0138] Optionally, the first control signal and the second control signal may specifically be one or more of any reasonable control signals such as a PWM signal or a PFM signal, and the present application does not limit this.

[0139] S410: Utilize the second control signal to enhance the second AC signal, so as to utilize the enhanced second AC signal to extend the retention time of the DC output signal within the second threshold range.

[0140] The switch regulation circuit is used to receive a second control signal sent by the main control circuit, and adjust the short-circuit state of the secondary winding in the isolation transformer based on the second control signal, such as short-circuiting at least part of the secondary winding, or adjusting the time ratio between at least part of the secondary winding being short-circuited and not short-circuited, so as to regulate the current of the AC signal on the primary winding side of the isolation transformer.

[0141] It is worth noting that a short circuit on the secondary side of the transformer will cause the current on the primary side of the transformer to increase instantly, and the number of turns flowing through the transformer will decrease. Therefore, after a short circuit on the secondary side occurs, an overcurrent phenomenon will occur on the primary side of the transformer.

[0142] It can be seen from this that by adjusting the short-circuit state of the secondary winding, the current of the AC signal on the primary winding side of the isolation transformer can be effectively increased, so that when the AC power supply is powered off, the inverter circuit, the primary winding and the secondary winding can be used to effectively increase the current flowing through the resonant circuit to increase the energy storage in the resonant circuit. Therefore, when the AC power supply is powered off and the AC input signal gradually decays, the increased energy storage of the resonant circuit can be effectively used to discharge the load circuit through the isolation transformer, the switching regulation circuit and the rectifier circuit, so as to extend the retention time of the DC output signal within the second threshold range.

[0143] See also Fig. 9 , Fig. 9 : is a flow chart of the second embodiment of the power control method of the present application. The power control method of this embodiment is Figure 8 A flowchart of a detailed implementation of the power control method in the embodiment of the present invention specifically includes the following steps:

[0144] S51: receiving an AC input signal sent by an external AC power source.

[0145] S52: Convert the AC input signal into a first DC signal.

[0146] S53: Convert the first DC signal into a second AC signal.

[0147] S54: Adjust the second AC signal.

[0148] S55: Convert the adjusted second AC signal into a third AC signal.

[0149] S56: Convert the third AC signal into a DC output signal to output to an external load circuit.

[0150] S57: Generate a first control signal based on the DC output signal.

[0151] S58: Regulate the second AC signal using the first control signal.

[0152] Among them, S51, S52, S53, S54, S55, S56, S57 and S58 are Figure 8 S41, S42, S43, S44, S45, S46, S47 and S48 are the same. Please refer to S41, S42, S43, S44, S45, S46, S47 and S48 and their related text descriptions for details. I will not repeat them here.

[0153] S59: In response to the effective value of the voltage being lower than the first threshold range and the instantaneous value of the voltage being higher than the fourth threshold range, generating a fourth driving signal using the first driving signal.

[0154] Specifically, the first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, and the frequencies of the first drive signal, the second drive signal, the third drive signal, and the fourth drive signal are much greater than the frequency of the AC input signal, and the periods are much smaller than the period of the AC input signal.

[0155] The main control circuit specifically sends a first drive signal to the first switch sub-circuit when it detects that the effective value of the voltage of the AC input signal is lower than the first threshold range, that is, the AC power supply is powered off, and the instantaneous value of the voltage of the AC input signal is higher than the fourth threshold range, and uses the first drive signal to generate a fourth drive signal.

[0156] Among them, the first drive signal has a phase opposite to that of the second drive signal and the same phase as that of the fourth drive signal; or, the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, and the falling edge of the fourth drive signal leads the first drive signal by a second set time length.

[0157] S510: Generate a third driving signal using the second driving signal.

[0158] At the same time, the main control circuit is also used to send a second drive signal to the second switch sub-circuit, and generate a third drive signal using the second drive signal.

[0159] The second drive signal and the third drive signal have the same phase; or the rising edge of the third drive signal lags behind the second drive signal by a first set time length, and the falling edge of the third drive signal precedes the second drive signal by a second set time length.

[0160] S511: Utilize the third driving signal and the fourth driving signal to enhance the second AC signal, so as to utilize the enhanced second AC signal to extend the holding time of the DC output signal within the second threshold range.

[0161] Furthermore, the main control circuit sends a third drive signal to the third switch sub-circuit, thereby triggering the third switch sub-circuit to short-circuit the two ends of the first sub-secondary winding, thereby increasing the current on one side of the primary winding, that is, flowing through the resonant circuit, and sends a fourth drive signal to the fourth switch sub-circuit, thereby triggering the fourth switch sub-circuit to short-circuit the two ends of the second sub-secondary winding, thereby further increasing the energy storage of the resonant circuit, and then using the increased energy storage in the resonant circuit to extend the retention time of the DC output signal within the second threshold range.

[0162] See also Fig.10 , Fig.10 : is a flow chart of the third embodiment of the power control method of the present application. The power control method of this embodiment is Figure 8 A flowchart of a detailed implementation of the power control method in the embodiment of the present invention specifically includes the following steps:

[0163] S61: receiving an AC input signal sent by an external AC power source.

[0164] S62: Convert the AC input signal into a first DC signal.

[0165] S63: Convert the first DC signal into a second AC signal.

[0166] S64: Adjust the second AC signal.

[0167] S65: Convert the adjusted second AC signal into a third AC signal.

[0168] S66: Convert the third AC signal into a DC output signal to output to an external load circuit.

[0169] S67: Generate a first control signal based on the DC output signal.

[0170] S68: Regulate the second AC signal using the first control signal.

[0171] Among them, S61, S62, S63, S64, S65, S66, S67 and S68 are Figure 8 S41, S42, S43, S44, S45, S46, S47 and S48 are the same. Please refer to S41, S42, S43, S44, S45, S46, S47 and S48 and their related text descriptions for details. I will not repeat them here.

[0172] S69: In response to the effective value of the voltage of the AC input signal being lower than the first threshold range and the instantaneous value of the voltage being lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal, generating a fourth drive signal using the first drive signal.

[0173] The first control signal includes a first driving signal and a second driving signal, and the second control signal includes a third driving signal and / or a fourth driving signal.

[0174] The main control circuit is also specifically used to detect the voltage phase of the AC input signal to determine whether the AC input signal is in the positive half cycle of the voltage or the positive and negative cycle of the voltage, and when it is detected that the effective value of the voltage of the AC input signal is lower than the first threshold range, that is, the AC power supply has a power failure, and the instantaneous value of the voltage is lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal, a first drive signal is sent to the first switch sub-circuit, and the first drive signal is used to generate a fourth drive signal.

[0175] The first drive signal and the fourth drive signal have the same phase; or the rising edge of the fourth drive signal lags behind the first drive signal by a first set time length, and the falling edge of the fourth drive signal leads the first drive signal by a second set time length.

[0176] S610: In a negative half cycle of the voltage of the AC input signal, generate a third driving signal using the second driving signal.

[0177] The main control circuit is also used to send a second drive signal to the second switch sub-circuit during the negative half cycle of the voltage of the AC input signal, and generate a third drive signal using the second drive signal.

[0178] The second drive signal and the third drive signal have the same phase; or the rising edge of the third drive signal lags behind the second drive signal by a first set time length, and the falling edge of the third drive signal precedes the second drive signal by a second set time length.

[0179] S611: Utilize the third driving signal and / or the fourth driving signal to enhance the second AC signal, so as to utilize the enhanced second AC signal to extend the retention time of the DC output signal within the second threshold range.

[0180] Furthermore, the main control circuit sends a fourth drive signal to the fourth switch sub-circuit to short-circuit the two ends of the second sub-secondary winding to increase the current on one side of the primary winding, that is, the current flowing through the resonant circuit, to increase the energy storage of the resonant circuit, and / or sends a third drive signal to the third switch sub-circuit to short-circuit the two ends of the first sub-secondary winding to increase the energy storage of the resonant circuit, thereby utilizing the increased energy storage in the resonant circuit to extend the retention time of the DC output signal within the second threshold range.

[0181] It is understandable that in some other embodiments, the power control method further includes some other more specific circuit units to implement other more specific control methods. Figure 1-Figure 7 And related text descriptions will not be repeated here.

[0182] This application also specifically uses an electronic device, see Fig.11 , Fig.11Schematic diagram of the framework of an electronic device of the present application. In this embodiment, the electronic device 70 includes a housing 71 and a power supply circuit 72 connected to the housing 71 .

[0183] Optionally, the electronic device 70 may be any reasonable electronic mechanical device such as a server, a computer, an intelligent communication device, etc., and this application does not limit this.

[0184] It should be noted that the power circuit 72 described in this embodiment is the power circuit 10, the power circuit 20 or the power circuit 30 described in any one of the above embodiments. Figure 1-Figure 7 And the related text content will not be repeated here.

[0185] The beneficial effects of the present application are as follows: Different from the prior art, the main control circuit in the power supply circuit provided by the present application is used to detect the effective value and instantaneous value of the voltage of the AC input signal provided by the AC power supply and the DC output signal output by the rectifier circuit to the load circuit, so as to generate a first control signal based on the DC output signal, and in response to the effective value of the voltage being lower than the first threshold range, generate a second control signal according to the effective value of the voltage, the instantaneous value of the voltage and the first control signal; the inverter circuit receives the first control signal to change the switch state under the action of the first control signal; the switch regulation circuit receives the second control signal, and adjusts the short-circuit state of the secondary winding in the isolation transformer based on the second control signal, so as to utilize the inverter circuit, the primary winding and the secondary winding in the isolation transformer to enhance the energy storage of the resonant circuit, and utilize the energy storage of the resonant circuit to extend the holding time of the DC output signal within the second threshold range, thereby effectively realizing power-off retention, and the implementation cost is low, the volume is small, the circuit is simple, the response speed is fast, the circuit control is simpler, and the power-off delay is longer; in addition, the circuit energy loss is effectively reduced during the long-term operation of the power supply circuit, and the power supply efficiency and reliability are improved, avoiding additional costs.

[0186] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power supply circuit, characterized in that: The power supply circuit comprises: A power factor correction circuit, an inverter circuit, a resonant circuit, an isolation transformer, a switch regulation circuit, a rectifier circuit and a main control circuit, wherein the isolation transformer includes a primary winding and a secondary winding; Wherein, the power factor correction circuit is used to couple with an AC power supply, the inverter circuit is coupled with the power factor correction circuit, the resonant circuit and the main control circuit, the resonant circuit is coupled with the primary winding, the primary winding is coupled with the secondary winding, the switch regulation circuit is coupled with the secondary winding, the rectifier circuit and the main control circuit, and the rectifier circuit is used to couple with a load circuit; The main control circuit is used to detect the effective value of the voltage and the instantaneous value of the voltage of the AC input signal provided by the AC power supply and the DC output signal output by the rectifier circuit to the load circuit, so as to generate a first control signal based on the DC output signal, and in response to the effective value of the voltage being lower than a first threshold range, generate a second control signal according to the effective value of the voltage, the instantaneous value of the voltage and the first control signal; The inverter circuit is used to receive the first control signal to change the switch state under the action of the first control signal; The switch regulation circuit is used to receive the second control signal and adjust the short-circuit state of the secondary winding based on the second control signal, so as to utilize the primary winding and the secondary winding to increase the energy storage of the resonant circuit, and utilize the energy storage of the resonant circuit to extend the maintenance time of the DC output signal within the second threshold range.

2. The power supply circuit according to claim 1, characterized in that: The inverter circuit includes a first switch subcircuit and a second switch subcircuit, the secondary winding includes one or more unit secondary windings, the switch regulation circuit includes one or more fifth switch subcircuits, the number of the unit secondary windings is equal to the number of the fifth switch subcircuits, the first switch subcircuit is coupled to the second switch subcircuit, the power factor correction circuit, the resonant circuit and the main control circuit, each of the unit secondary windings is coupled to the primary winding and coupled to one of the fifth switch subcircuits, and each of the fifth switch subcircuits is coupled to the main control circuit; Wherein, the first control signal includes a first drive signal and a second drive signal, and the main control circuit is further used to detect the voltage phase of the AC input signal, so as to send the first drive signal to the first switch sub-circuit in the positive half cycle of the voltage of the AC input signal when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is lower than the third threshold range, and to generate the second control signal by using the first drive signal, so as to send the second control signal to one or part of the fifth switch sub-circuit, and the first drive signal and the second control signal have the same phase, or the rising edge of the second control signal lags behind the first set time length of the first drive signal, and the falling edge of the second control signal leads the second set time length of the first drive signal; And / or, in the negative half cycle of the voltage of the AC input signal, the second drive signal is sent to the second switch sub-circuit, and the second drive signal is used to generate the second control signal to send the second control signal to one or another part of the fifth switch sub-circuit, the second drive signal is in phase with the second control signal, or the rising edge of the second control signal lags behind the first set time length of the second drive signal, and the falling edge of the second control signal leads the second set time length of the second drive signal.

3. The power supply circuit according to claim 1, characterized in that: The inverter circuit includes a first switch subcircuit and a second switch subcircuit, the secondary winding includes a first sub-secondary winding and a second sub-secondary winding connected in series, the switch regulation circuit includes a third switch subcircuit and a fourth switch subcircuit, the first switch subcircuit is coupled to the second switch subcircuit, the power factor correction circuit, the resonant circuit and the main control circuit, the first sub-secondary winding and the second sub-secondary winding are both coupled to the primary winding and coupled to the third switch subcircuit and the fourth switch subcircuit, and the third switch subcircuit and the fourth switch subcircuit are coupled to the main control circuit; Wherein, the first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is higher than the fourth threshold range, the main control circuit sends the first drive signal to the first switch sub-circuit, and generates the fourth drive signal by using the first drive signal, so as to send the fourth drive signal to the fourth switch sub-circuit, and sends the second drive signal to the second switch sub-circuit, and generates the third drive signal by using the second drive signal, so as to send the third drive signal to the third switch sub-circuit, the first drive signal is opposite in phase to the second drive signal and has the same phase as the fourth drive signal, the second drive signal is the same in phase as the third drive signal, or the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, the falling edge of the fourth drive signal leads the second set time length of the first drive signal, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal; Alternatively, the main control circuit is further configured to detect the voltage phase of the AC input signal, so that when the effective value of the voltage is lower than the first threshold range and the instantaneous value of the voltage is lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal, the first drive signal is sent to the first switch sub-circuit, and the fourth drive signal is generated by using the first drive signal, so that the fourth drive signal is sent to the fourth switch sub-circuit, the first drive signal and the fourth drive signal are in phase, or the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, and the falling edge of the fourth drive signal leads the first set time length of the first drive signal; and / or, in the negative half cycle of the voltage of the AC input signal, the second drive signal is sent to the second switch sub-circuit, and the third drive signal is generated by using the second drive signal, so that the third drive signal is sent to the third switch sub-circuit, the second drive signal and the third drive signal are in phase, or the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal.

4. The power supply circuit according to claim 3, characterized in that: The switch regulation circuit further includes a first energy storage subcircuit and a second energy storage subcircuit, the first energy storage subcircuit is coupled to the third switch subcircuit, and the second energy storage subcircuit is coupled to the fourth switch subcircuit; The main control circuit is further configured to send the fourth drive signal to the fourth switch subcircuit in a positive half cycle of the voltage of the AC input signal to trigger the fourth switch subcircuit to turn on the fourth switch subcircuit, so as to enable the second energy storage subcircuit to store energy, when the effective value of the voltage is lower than the first threshold range and the voltage of the DC output signal is lower than the fifth threshold range; And / or, in the negative half cycle of the voltage of the AC input signal, the third driving signal is sent to the third switch sub-circuit to trigger the third switch sub-circuit to be turned on, so that the first energy storage sub-circuit stores energy.

5. The power supply circuit according to claim 3, characterized in that: The first switch subcircuit includes a first switch tube, the second switch subcircuit includes a second switch tube, the third switch subcircuit includes a third switch tube, and the fourth switch subcircuit includes a fourth switch tube; Among them, the first end of the first switch tube is coupled to the first end of the power factor correction circuit and the first end of the resonant circuit, the second end of the first switch tube is coupled to the first end of the second switch tube and the third end of the resonant circuit, the second end of the second switch tube is coupled to the second end of the power factor correction circuit and the second end of the resonant circuit, the first end of the third switch tube is coupled to the first end of the first sub-secondary winding and the first end of the rectifier circuit, the second end of the third switch tube is coupled to the first end of the fourth switch tube, the second end of the first sub-secondary winding and the first end of the second sub-secondary winding, the second end of the fourth switch tube is coupled to the second end of the second sub-secondary winding and the second end of the rectifier circuit, and the third end of each of the first switch tube, the second switch tube, the third switch tube and the fourth switch tube is coupled to the main control circuit.

6. The power supply circuit according to claim 5, characterized in that: The power supply circuit also includes a switch freewheeling circuit, and the switch freewheeling circuit includes a first freewheeling resistor, a second freewheeling resistor, a first freewheeling capacitor, a second freewheeling capacitor, a first diode, and a second diode; Among them, the first end of the first freewheeling resistor is coupled to the first end of the first switch tube and the second end of the first diode, the second end of the first freewheeling resistor is coupled to the first end of the first freewheeling capacitor, the second end of the first freewheeling capacitor is coupled to the second end of the second diode, the second end of the first switch tube, the first end of the second switch tube, the first end of the second freewheeling resistor, and the second end of the second diode, the second end of the second freewheeling resistor is coupled to the first end of the second freewheeling capacitor, and the second end of the second freewheeling capacitor is coupled to the second end of the second switch tube and the first end of the second diode.

7. The power supply circuit according to claim 6, characterized in that: The resonant circuit includes a first resonant capacitor, a second resonant capacitor, a resonant inductor and a resonant resistor, the rectifier circuit includes a third diode and a fourth diode, the power supply circuit also includes a voltage-stabilizing output circuit, and the voltage-stabilizing output circuit includes a voltage-stabilizing resistor and a voltage-stabilizing capacitor; Wherein, the first end of the first resonant capacitor is coupled to the first end of the first freewheeling resistor, the first end of the first switch tube and the second end of the first diode, the second end of the first resonant capacitor is coupled to the first end of the second resonant capacitor and the second end of the primary winding, the second end of the second resonant capacitor is coupled to the second end of the first freewheeling capacitor, the second end of the second switch tube and the first end of the second diode, the first end of the resonant inductor is coupled to the second end of the first freewheeling capacitor, the second end of the second diode, the second end of the first switch tube, the first end of the second switch tube, the first end of the second freewheeling resistor and the second end of the second diode, the second end of the resonant inductor is coupled to the first end of the resonant resistor, and the second end of the resonant resistor is coupled to the first end of the primary winding; The first end of the third diode is coupled to the first end of the third switch tube and the first end of the first sub-secondary winding, the second end of the third diode is coupled to the second end of the fourth diode, the first end of the stabilizing resistor and the first end of the load circuit, the first end of the fourth diode is coupled to the second end of the fourth switch tube and the second end of the second sub-secondary winding, the second end of the stabilizing resistor is coupled to the first end of the stabilizing capacitor, and the second end of the stabilizing capacitor is coupled to the second end of the third switch tube, the first end of the fourth switch tube, the second end of the first sub-secondary winding, the first end of the second sub-secondary winding and the second end of the load circuit.

8. The power supply circuit according to any one of claims 1 to 7, characterized in that: The main control circuit includes a sampling circuit, a first proportional filtering correction circuit, a second proportional filtering correction circuit, a signal processing circuit and a driving circuit, wherein the sampling circuit is coupled to the power factor correction circuit, the rectifier circuit, the first proportional filtering correction circuit and the second proportional filtering correction circuit, the signal processing circuit is coupled to the first proportional filtering correction circuit, the second proportional filtering correction circuit and the driving circuit, and the driving circuit is coupled to the inverter circuit and the switch regulation circuit; The sampling circuit samples and obtains the AC input signal in the power factor correction circuit and the DC output signal in the rectification circuit; The first proportional filtering and correction circuit receives the AC input signal, and sequentially filters and corrects the AC input signal to obtain a first filtered signal; The second proportional filtering and correction circuit receives the DC output signal, and sequentially filters and corrects the DC output signal to obtain a second filtered signal; The signal processing circuit is used to receive the first filtered signal and the second filtered signal to control the drive circuit to generate a first control signal based on the second filtered signal, and in response to the effective value of the voltage of the first filtered signal being lower than a first threshold range, control the drive circuit to generate a second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the first filtered signal and the first control signal.

9. A power supply control method, applied to the power supply circuit according to any one of claims 1 to 8, characterized in that: The power control method comprises: receiving an AC input signal sent by an external AC power source; Converting the AC input signal into a first DC signal; converting the first DC signal into a second AC signal; adjusting the second AC signal; converting the adjusted second AC signal into a third AC signal; Converting the third AC signal into a DC output signal to output to an external load circuit; generating a first control signal based on the DC output signal; regulating the second AC signal using the first control signal; In response to the effective value of the voltage of the AC input signal being lower than a first threshold range, generating a second control signal according to the effective value of the voltage, the instantaneous value of the voltage of the AC input signal and the first control signal; The second control signal is used to increase the second AC signal, so as to use the increased second AC signal to extend the holding time of the DC output signal within the second threshold range.

10. The power control method according to claim 9, characterized in that: The first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and a fourth drive signal, and the step of generating a second control signal according to the voltage effective value, the voltage instantaneous value of the AC input signal and the first control signal in response to the voltage effective value of the AC input signal being lower than a first threshold range comprises: In response to the effective value of the voltage being lower than a first threshold range and the instantaneous value of the voltage being higher than a fourth threshold range, generating the fourth drive signal using the first drive signal; Generate the third drive signal using the second drive signal; wherein the first drive signal is opposite in phase to the second drive signal and has the same phase as the fourth drive signal, the second drive signal is the same in phase as the third drive signal, or the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, the falling edge of the fourth drive signal leads the first set time length of the first drive signal, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal; The step of using the second control signal to increase the second AC signal comprises: The second AC signal is boosted by using the third driving signal and the fourth driving signal.

11. The power control method according to claim 9, characterized in that: The first control signal includes a first drive signal and a second drive signal, the second control signal includes a third drive signal and / or a fourth drive signal, and the step of generating a second control signal according to the voltage effective value, the voltage instantaneous value of the AC input signal and the first control signal in response to the voltage effective value of the AC input signal being lower than a first threshold range comprises: In response to the effective value of the voltage of the AC input signal being lower than the first threshold range, and the instantaneous value of the voltage being lower than the third threshold range, in the positive half cycle of the voltage of the AC input signal, the fourth drive signal is generated by using the first drive signal; wherein the first drive signal and the fourth drive signal have the same phase, or the rising edge of the fourth drive signal lags behind the first set time length of the first drive signal, and the falling edge of the fourth drive signal leads the first drive signal by a second set time length; and / or, in the negative half cycle of the voltage of the AC input signal, the third drive signal is generated by using the second drive signal; wherein the second drive signal and the third drive signal have the same phase, the rising edge of the third drive signal lags behind the first set time length of the second drive signal, and the falling edge of the third drive signal leads the second set time length of the second drive signal; The step of using the second control signal to increase the second AC signal comprises: The second AC signal is boosted by using the third driving signal and / or the fourth driving signal.

12. An electronic device, characterized in that: The electronic device comprises a housing and a power circuit connected to the housing; Wherein, the power supply circuit is the power supply circuit as claimed in any one of claims 1-8.

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