Power supply regulating circuit, power supply control method and electronic equipment

Abstract

The present application discloses a power supply regulation circuit, a power supply control method and an electronic device, wherein the power supply regulation circuit includes: an inverter circuit for receiving a first DC signal input to convert it into a first AC signal; a resonant circuit for regulating the first AC signal into a resonant current signal; an isolation transformer for converting the resonant current signal into a second AC signal; an electric energy conversion circuit for converting the second AC signal into a second DC signal to output to a load circuit; a main control circuit for comparing the second AC signal with a set reference threshold to obtain a first control signal; and the electric energy conversion circuit utilizes a negative current in the second AC signal, or a negative current less than the set reference threshold to increase the energy storage of the resonant circuit, so as to extend the holding time of the second DC signal within the second voltage threshold when the first DC signal is lower than the first voltage threshold. In the above manner, the power supply regulation circuit of the present application can effectively extend the power-off holding time with low energy loss.

Description

Technical Field

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

[0002] Nowadays, in the actual application of power regulation 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 regulation 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 regulation circuit, or the voltage when the storage capacitor is discharged. However, when the capacitance value increases, the cost and volume of the power regulation 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 regulation circuit will also increase significantly, and because the working voltage is raised, 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 regulation circuit, a power control method and an electronic device, which can solve the problems of high cost and large size of the power-off retention of the power regulation 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 regulation circuit, wherein the power supply regulation circuit includes: an inverter circuit, which is used to receive a first DC signal input to convert the first DC signal into a first AC signal; a resonant circuit, coupled to the inverter circuit, to receive a first AC signal sent by the inverter circuit, and to adjust the first AC signal to a resonant current signal; an isolation transformer, coupled to the resonant circuit, to receive a resonant current signal sent by the resonant circuit, and to convert the resonant current signal into a second AC signal; an electric energy conversion circuit, coupled to the isolation transformer, and used to couple with a load circuit to receive the second AC signal sent by the isolation transformer. signal, and converts the second AC signal into a second DC signal to be output to the load circuit; a main control circuit is coupled to the power conversion circuit, and the main control circuit obtains the second AC signal in the power conversion circuit to compare the second AC signal with a set reference threshold to obtain a first control signal; the power conversion circuit receives the first control signal to use the first control signal to convert the second AC signal into a second DC signal, and uses the negative current in the second AC signal, or the negative current less than the set reference threshold, to increase the energy storage of the resonant circuit, so that when the first DC signal is lower than the first voltage threshold, the energy storage of the resonant circuit is used to extend the holding time of the second DC signal within the second voltage threshold.

[0006] The main control circuit is also used to obtain a second DC signal in the power conversion circuit, so as to compare the second AC signal with a set reference threshold to obtain a first control signal when the voltage of the second DC signal is greater than the voltage of the second AC signal.

[0007] Wherein, the isolation transformer includes a primary winding and a first secondary winding and a second secondary winding coupled to the primary winding, the power conversion circuit also includes a first switch subcircuit and a second switch subcircuit, the primary winding is coupled to the resonant circuit, the first switch subcircuit is coupled to the first secondary winding, the second switch subcircuit and the main control circuit, and is used to couple with the load circuit, the second switch subcircuit is coupled to the second secondary winding and the main control circuit, the first control signal includes a first drive signal and a second drive signal; wherein, the second AC signal includes a first voltage signal at both ends of the first secondary winding and a second voltage signal at both ends of the second secondary winding, the reference threshold is set to a voltage reference threshold or a current reference threshold, the main control circuit is used to obtain the first voltage signal and the second voltage signal, so that when the first voltage signal is less than the voltage reference threshold, the first drive signal is adjusted from the first level to the second level, and the second drive signal is adjusted from the second level to the first level at the same time or with a delay of a set time, and when the second voltage signal is less than the voltage reference threshold, the second drive signal is adjusted from the first level to the second level, and at the same time The first drive signal is adjusted from the second level to the first level at a time or a delay setting time; wherein the voltage reference threshold is greater than 0; and / or, the second AC signal includes a first current signal flowing through the first switch subcircuit and a second current signal flowing through the first switch subcircuit, and the reference threshold is set as the current reference threshold. The main control circuit is used to obtain the first current signal and the second current signal, so that when the first current signal is less than the current reference threshold, the first drive signal is adjusted from the first level to the second level, and at the same time or with a delay setting time, the second drive signal is adjusted from the second level to the first level, and when the second current signal is less than the current reference threshold, the second drive signal is adjusted from the first level to the second level, and at the same time or with a delay setting time, the first drive signal is adjusted from the second level to the first level; wherein the difference between the current reference threshold and 0 is the set current amplitude; the first switch subcircuit and the second switch subcircuit are respectively used to receive the first drive signal and the second drive signal, so as to use the first drive signal and the second drive signal to adjust the second DC signal and the energy storage of the resonant circuit.

[0008] Wherein, the main control circuit also includes a first sampling circuit, a second sampling circuit, a first proportional filter correction subcircuit and a control subcircuit, the first sampling circuit is coupled to the first switch subcircuit and the first proportional filter correction subcircuit, the second sampling circuit is coupled to the second switch subcircuit and the first proportional filter correction subcircuit, the first proportional filter correction subcircuit is coupled to the control subcircuit, and the control subcircuit is coupled to the first switch subcircuit and the second switch subcircuit; wherein, the first sampling circuit is used to sample and obtain a first voltage signal at both ends of the first secondary winding, and / or a first current signal in the first switch subcircuit; the second sampling circuit is used to sample and obtain a second voltage signal at both ends of the second secondary winding, and / or a second current signal in the second switch subcircuit; a first proportional filtering and correction subcircuit for receiving a first voltage signal and a second voltage signal, and filtering and correcting the first voltage signal and the second voltage signal in sequence respectively to obtain a first filtered signal and a second filtered signal; and / or, a first proportional filtering and correction subcircuit for receiving a first current signal and a second current signal, and filtering and correcting the first current signal and the second current signal in sequence respectively to obtain a first filtered signal and a second filtered signal; a control subcircuit for receiving a first filtered signal and a second filtered signal, and using the first filtered signal and the second filtered signal to generate a first drive signal and a second drive signal respectively.

[0009] In which, the inverter circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, and the resonant circuit includes a resonant capacitor and a resonant inductor; wherein, the first end of the first switch tube is coupled to the first end of the third switch tube, and is used to couple with the first end of the DC power supply, the second end of the second switch tube is coupled to the second end of the fourth switch tube, and is used to couple with the first end of the DC power supply, the second end of the first switch tube is coupled to the first end of the second switch tube and the first end of the resonant capacitor, the second end of the third switch tube is coupled to the first end of the fourth switch tube and the second end of the primary winding, the second end of the resonant capacitor is coupled to the first end of the resonant inductor, the second end of the resonant inductor is coupled to the first end of the primary winding, 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] Among them, the power supply regulation circuit also includes an excitation inductor and a voltage-stabilizing output circuit, the voltage-stabilizing output circuit includes a voltage-stabilizing resistor and a voltage-stabilizing capacitor, the first switch sub-circuit includes a fifth switch tube, and the second switch sub-circuit includes a sixth switch tube; wherein, the first end of the primary winding is coupled to the first end of the resonant inductor and the first end of the excitation inductor, the second end of the primary winding is coupled to the second end of the third switch tube, the first end of the fourth switch tube and the second end of the excitation inductor, the first end of the first secondary winding is coupled to the first end of the fifth switch tube, the second end of the fifth switch tube is coupled to the first end of the voltage-stabilizing resistor and the second end of the sixth switch tube, and is used to couple the first end of the load circuit, the second end of the first secondary winding is coupled to the first end of the second secondary winding and the second end of the voltage-stabilizing capacitor, and is used to couple the second end of the load circuit, the second end of the voltage-stabilizing resistor is coupled to the first end of the voltage-stabilizing capacitor, the second end of the second secondary winding is coupled to the first end of the sixth switch tube, and the third end of the fifth switch tube and the third end of the sixth switch tube are coupled to the main control circuit.

[0011] Among them, the main control circuit is also used to obtain the second DC signal in the power conversion circuit to compare the voltage of the second DC signal with the third voltage threshold to determine the signal frequency of the third drive signal and the fourth drive signal, and send the third drive signal and the fourth drive signal according to the signal frequency; the first switch tube and the fourth switch tube are used to receive the third drive signal, and the second switch tube and the third switch tube are used to receive the fourth drive signal, so as to use the third drive signal and the fourth drive signal to convert the first DC signal into a first AC signal.

[0012] 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 a first DC signal input; converting the first DC signal into a first AC signal; adjusting the first AC signal to a resonant current signal; converting the resonant current signal into a second AC signal; converting the second AC signal into a second DC signal to output to a load circuit; comparing the second AC signal with a set reference threshold to obtain a first control signal; using the first control signal to adjust the second DC signal; using the negative current in the second AC signal, or a negative current less than the set reference threshold to enhance the resonant current signal; when the first DC signal is lower than the first voltage threshold, using the enhanced resonant current signal to extend the retention time of the second DC signal within the second threshold range.

[0013] Wherein, the reference threshold is set as a voltage reference threshold, the second AC signal includes a first voltage signal and a second voltage signal, the first control signal includes a first drive signal and a second drive signal, and the step of comparing the second AC signal with the set reference threshold to obtain the first control signal includes: when the first voltage signal is less than the voltage reference threshold, adjusting the first drive signal from the first level to the second level, and adjusting the second drive signal from the second level to the first level at the same time or with a delay of a set time; when the second voltage signal is less than the voltage reference threshold, adjusting the second drive signal from the first level to the second level, and adjusting the first drive signal from the second level to the first level at the same time or with a delay of a set time; wherein the voltage reference threshold is greater than 0; the step of adjusting the second DC signal using the first control signal includes: adjusting the second DC signal using the first drive signal and the second drive signal; the step of using the negative current in the second DC signal that is less than the set reference threshold to increase the resonant current signal includes: using the negative current in the second DC signal to increase the resonant current signal.

[0014] Wherein, the set reference threshold is a current reference threshold, the second AC signal includes a first current signal and a second current signal, the first control signal includes a first drive signal and a second drive signal, and the step of comparing the second AC signal with the set reference threshold to obtain the first control signal includes: when the first current signal is less than the current reference threshold, adjusting the first drive signal from the first level to the second level, and adjusting the second drive signal from the second level to the first level at the same time or after a delay of a set time; wherein, the difference between the current reference threshold and 0 is the set current amplitude; when the second current signal is less than the current reference threshold, adjusting the second drive signal from the first level to the second level, and adjusting the first drive signal from the second level to the first level at the same time or after a delay of a set time; the step of adjusting the second DC signal using the first control signal includes: adjusting the second DC signal using the first drive signal and the second drive signal; the step of using the negative current in the second AC signal that is less than the current reference threshold to increase the resonant current signal includes: using the negative current in the first current signal and the second current signal that is less than the current reference threshold to increase the resonant current signal.

[0015] 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 regulation circuit connected to the shell; wherein the power regulation circuit is a power regulation circuit as described in any of the above items.

[0016] The beneficial effects of the present application are as follows: different from the prior art, the inverter circuit in the power supply regulation circuit provided by the present application is used to receive a first DC signal input to convert the first DC signal into a first AC signal, the resonant circuit regulates the first AC signal into a resonant current signal, the isolation transformer converts the resonant current signal into a second AC signal, the power conversion circuit is used to convert the second AC signal into a second DC signal to output to the load circuit, the main control circuit obtains the second DC signal to compare the second DC signal with a set reference threshold to obtain a first control signal, the power conversion circuit can use the first control signal to convert the second AC signal into a second DC signal, and use the negative current in the second DC signal, or the negative current less than the set reference threshold, to increase the energy storage of the resonant circuit, so that when the first DC signal is lower than the first voltage threshold, the energy storage of the resonant circuit is used to extend the holding time of the second DC signal within the second voltage threshold, 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, during the long-term operation of the power supply regulation circuit, the circuit energy loss is effectively reduced, the power supply efficiency and reliability are improved, and additional costs are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 It is a structural schematic diagram of the first embodiment of the power supply regulation circuit of the present application;

[0019] Figure 2 It is a structural schematic diagram of a second embodiment of the power supply regulating circuit of the present application;

[0020] Figure 3 yes Figure 2 A schematic diagram of waveforms of a first voltage signal at two ends of a first secondary winding and a second voltage signal at two ends of a second secondary winding;

[0021] Figure 4 It is a structural schematic diagram of a third embodiment of the power supply regulating circuit of the present application;

[0022] Figure 5 yes Figure 4 A schematic diagram of waveforms of a first current signal flowing through a first switch sub-circuit and a second current signal flowing through the first switch sub-circuit;

[0023] Figure 6It is a flowchart of the first embodiment of the power control method of the present application;

[0024] Figure 7 It is a flow chart of the second embodiment of the power control method of the present application;

[0025] Figure 8 It is a flowchart of the third embodiment of the power control method of the present application;

[0026] Fig. 9 It is a schematic diagram of the framework of an implementation scheme of the electronic device of the present application. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The present application is described in detail below with reference to the accompanying drawings and implementation methods.

[0031] See also Figure 1 , Figure 1 It is a schematic diagram of the structure of the first embodiment of the power supply regulating circuit of the present application. In this embodiment, the power supply regulating circuit 10 includes: an inverter circuit 11, a resonant circuit 12, an isolation transformer 13, an electric energy conversion circuit 14 and a main control circuit 15.

[0032] Among them, a power supply regulation circuit 10 provided in the present application is specifically used in the power supply of power loads that require DC output, so as to utilize external input DC power, and after corresponding regulation and control of the DC power, provide it to the power loads in any reasonable electronic equipment such as servers, computers, intelligent communication equipment, etc. for operation, and this embodiment does not impose any restrictions on this.

[0033] Specifically, the inverter circuit 11 is used to receive a first DC signal input, and utilize its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT (Insulated Gate Bipolar Transistor), high-frequency transistor, MOS (Metal Oxide Semiconductor Field Effect Transistor), etc., to quickly switch the DC power under signal control to generate an alternating voltage waveform and obtain a first AC signal.

[0034] It is worth noting that the first DC signal can be specifically understood as the DC power input provided to the power regulation circuit 10 by an external DC power supply, or it can be the DC power supply output after power conversion and regulation of a municipal power supply, a photovoltaic power supply, an independent generator or any other reasonable superior AC or DC power supply.

[0035] 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.

[0036] The resonant circuit 12 is directly connected to the inverter circuit 11 to receive the first AC signal sent by the inverter circuit 11, and performs one or more of any reasonable signal adjustments such as filtering, shaping, phase shifting, etc. on the first AC signal to obtain a resonant current signal, so as to achieve better output characteristics and ensure that subsequent links, such as the power conversion circuit 14 or the load, obtain more stable and efficient power.

[0037] The isolation transformer 13 is coupled to the resonant circuit 12 to receive the resonant current signal sent by the resonant circuit 12 and convert the resonant current signal into a second AC signal, so as to use electromagnetic connection instead of electrical connection to achieve primary and secondary side safety electrical isolation and voltage matching, and meet the primary and secondary side electrical safety insulation requirements.

[0038] The power conversion circuit 14 is coupled to the isolation transformer 13 and is used to couple with the external load circuit 101, and specifically involves transformer isolation and rectification. Specifically, the power conversion circuit 14 receives the second AC signal sent by the isolation transformer 13, and uses a high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to obtain a stable DC output, i.e., a second DC signal, using the second AC signal to output to the load circuit 101 to meet the power usage of the load circuit 101.

[0039] Among them, the load circuit 101 can be understood as a signal function circuit that utilizes the DC output of the power supply regulation circuit 10, that is, the second DC signal to work and operate, and specifically can be one or more of any reasonable circuit units integrated with storage media, memory circuit elements, etc., so that power-off retention is required to complete necessary caching, signal sending and other tasks in a timely manner.

[0040] The main control circuit 15 is coupled to the power conversion circuit 14 for continuously monitoring the second AC signal from the power conversion circuit 14 and comparing the second AC signal with a set reference threshold to generate a first control signal based on the current comparison result, such as adjusting the level state of the first control signal in response to the voltage amplitude or current amplitude of the second AC signal being less than the set reference threshold to obtain a first control signal with a corresponding level change state.

[0041] Optionally, the first 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.

[0042] Optionally, the main control circuit 15 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.

[0043] Among them, the power conversion circuit 14 is specifically used to receive the first control signal sent by the main control circuit 15, and to utilize high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to change the switch state in response to the first control signal to convert the second AC signal into a second DC signal.

[0044] It is worth noting that due to the instability of the power supply output on the primary side of the isolation transformer 13, or the ripple in the voltage of the resonant current signal, and / or the instability of the load circuit 101 on the secondary side of the isolation transformer 13, it is inevitable that the output voltage on the secondary side of the isolation transformer 13 is higher than the input voltage on the primary side of the isolation transformer 13. At this time, a negative current will appear on the secondary side of the isolation transformer 13, that is, the second DC signal obtained by the power conversion circuit 14 using the second AC signal will have a negative current. By returning the negative current to the primary side of the isolation transformer 13 through the on-off control of the power conversion circuit 14, the energy storage of the resonant circuit 12 can be effectively improved.

[0045] In addition, the set reference threshold can specifically be a voltage reference threshold or a current reference threshold; and when the set reference threshold is a voltage reference threshold, the voltage reference threshold is greater than 0; when the set reference threshold is a current reference threshold, the difference between the current reference threshold and 0 is a set current amplitude, and specifically can be greater than 0, less than 0 or equal to 0; wherein, when the current reference threshold is greater than 0, the set current amplitude can specifically correspond to the switching action delay stage of the power conversion circuit 14, and the second AC signal can be reduced from the current reference threshold to the current amplitude corresponding to 0, so as to make the best use of the negative current of the second AC signal to increase the energy storage of the resonant circuit 12.

[0046] Among them, the power conversion circuit 14 is specifically used to utilize the negative current in the second AC signal, or the negative current in the second AC signal that is less than the set reference threshold. That is, if a negative current appears in the second AC signal (the current direction flows from the load circuit 101 to the isolation transformer 13), or when the amplitude of the negative current of the second AC signal is less than the set reference threshold, the power conversion circuit 14 changes its switching state under the action of the first control signal to return the negative current or the negative current less than the set reference threshold to the primary side of the isolation transformer 13 to increase the energy storage of the resonant circuit 12, so that when the power supply regulation circuit 10 is powered off, that is, when the input of the first DC signal decreases or disappears and is lower than the first voltage threshold, the energy storage of the resonant circuit 12 can be used to extend the retention time of the second DC signal within the second voltage threshold.

[0047] It is worth noting that the first voltage threshold can be understood as the threshold range of the voltage of the first DC signal when the first DC signal is powered normally or the power supply regulation circuit 10 maintains normal operation, so that when it is detected that the current voltage of the first DC signal is lower than the first threshold range, it can be determined that the input of the first DC signal has decreased or disappeared, that is, a power outage has occurred at present; the second threshold range can be understood as the voltage and current threshold range when the load circuit 101 maintains normal operation, and the specific range can be determined by the actual application scenario, and the present application does not limit this.

[0048] In addition, in the operation of some special load circuits 101, for example, when one or more of any reasonable circuit units such as storage media and memory circuit elements are integrated, in order to avoid irreversible losses such as cache failure and data loss caused by power interruption, when the power supply of the load circuit 101 stops supplying power, it is necessary to maintain the power output provided to the load circuit 101 for a certain period of time, that is, to effectively maintain the second DC 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.

[0049] The above scheme can effectively realize power-off retention by utilizing the energy storage of the resonant circuit 12 to extend the retention time of the second DC signal within the third voltage threshold when the first DC signal loses power, and has low implementation cost, small size, simple circuit, fast response speed, simpler circuit control, and longer power-off delay; in addition, during the long-term operation of the power supply regulation circuit 10, the circuit energy loss is effectively reduced, the power supply efficiency and reliability are improved, and additional costs are avoided.

[0050] In one embodiment, the main control circuit 15 is specifically used to obtain a second DC signal in the power conversion circuit 14, so that when it is detected that the voltage of the second DC signal is greater than the voltage of the second AC signal, that is, when it is determined that the second AC signal has a negative current, the second AC signal is compared with a set reference threshold to obtain a first control signal.

[0051] When the main control circuit 15 determines that the second AC signal does not have a negative current, it can also specifically adopt a high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to convert the second AC signal into a second DC signal to output to the load circuit 101 to meet the normal power usage of the load circuit 101, thereby avoiding inappropriate control of the power conversion circuit 14 when the second AC signal does not have a negative current, thereby affecting the normal use of the power regulation circuit 10.

[0052] Please refer to Figure 2 and Figure 3 ,in, Figure 2is a schematic diagram of the structure of the second embodiment of the power supply regulation circuit of the present application, Figure 3 yes Figure 2 Schematic diagram of the waveforms of the first voltage signal at both ends of the first secondary winding and the second voltage signal at both ends of the second secondary winding. The difference between the power regulation circuit in this embodiment and the first embodiment of the power regulation circuit provided in this application is that the isolation transformer 23 in the power regulation circuit 20 further includes a primary winding 231, a first secondary winding 232 and a second secondary winding 233.

[0053] Specifically, the power conversion circuit 24 further includes a first switch sub-circuit 241 and a second switch sub-circuit 242, the primary winding 231 is coupled to the resonant circuit 22, the first switch sub-circuit 241 is coupled to the first secondary winding 232, the second switch sub-circuit 242 and the main control circuit 25, and is used to couple with the load circuit 101, the second switch sub-circuit 242 is coupled to the second secondary winding 233 and the main control circuit 25, and the primary winding 231 is coupled to the first secondary winding 232 and the second secondary winding 233.

[0054] The first control signal specifically includes a first drive signal PWM1 and a second drive signal PWM2, the second AC signal specifically includes a first voltage signal Vup at both ends of the first secondary winding 232 and a second voltage signal Vdn at both ends of the second secondary winding 233, and the set reference threshold is specifically a voltage reference threshold V H , the voltage reference threshold V H Greater than 0 and close to 0.

[0055] The main control circuit 25 is specifically used to obtain the first voltage signal Vup and the second voltage signal Vdn, so as to determine that the first voltage signal Vup is less than the voltage reference threshold V H When the first driving signal PWM1 is adjusted from the first level to the second level, the second driving signal PWM2 is adjusted from the second level to the first level simultaneously or after a delay of the set time Tdb.

[0056] The main control circuit 25 determines that the second voltage signal Vdn is less than the voltage reference threshold V H Specifically, the second drive signal PWM2 is adjusted from the first level to the second level, and at the same time or with a delay of a set time length Tdb, the first drive signal PWM1 is adjusted from the second level to the first level, so as to periodically adjust the level states of the first drive signal PWM1 and the second drive signal PWM2, that is, the above-mentioned level change state is repeated in each signal period Ts, thereby obtaining the first drive signal PWM1 and the second drive signal PWM2.

[0057] It is worth noting that the set time length Tdb can be specifically determined according to the delay time for the first switch sub-circuit 241 and the second switch sub-circuit 242 to trigger on or off, that is, the dead time, and the present application does not limit this.

[0058] In addition, when the first driving signal PWM1 is at the first level, it can specifically trigger the first switch subcircuit 241 to turn on, and when it is at the second level, it can trigger the first switch subcircuit 241 to turn off; the second driving signal PWM2 and the second switch subcircuit 242 are the same, and will not be repeated here.

[0059] Optionally, the first level may be a high level, and the second level may correspond to a low level or a 0 level; or, the first level may be a low level or a 0 level, and the second level may correspond to a high level, which is not limited in the present application.

[0060] Among them, the first switch sub-circuit 241 is used to receive the first drive signal PWM1 to change the switch state under the action of the first drive signal PWM1, and the second switch sub-circuit 242 is used to receive the second drive signal PWM2 to change the switch state under the action of the second drive signal PWM2, and cooperate with the switch state of the first switch sub-circuit 241 to convert the second AC signal into a second DC signal, and use the negative current in the second AC signal to increase the energy storage of the resonant circuit 22.

[0061] It is understandable that, since the voltage reference threshold V H is greater than 0 and close to 0, and the first switch sub-circuit 241 and the second switch sub-circuit 242 are connected in series between the isolation transformer 23 and the load circuit 101, by H When the first drive signal PWM1 is adjusted from the first level to the second level to trigger the first switch sub-circuit 241 to shut down, the negative current in the second AC signal can be effectively returned to the primary side of the isolation transformer 23 to increase the energy storage of the resonant circuit 22, so that the energy storage of the resonant circuit 22 can be used to effectively extend the power-off holding time; the second drive signal PWM2 and the second switch sub-circuit 242 are the same and will not be repeated here.

[0062] In one embodiment, the main control circuit 25 specifically also includes a first sampling circuit, a second sampling circuit, a first proportional filter correction subcircuit 253 and a control subcircuit 254. The first sampling circuit is coupled to the first switch subcircuit 241 and the first proportional filter correction subcircuit 253, the second sampling circuit is coupled to the second switch subcircuit 242 and the first proportional filter correction subcircuit 253, the first proportional filter correction subcircuit 253 is coupled to the control subcircuit 254, and the control subcircuit 254 is coupled to the first switch subcircuit 241 and the second switch subcircuit 242.

[0063] Among them, the first sampling circuit can specifically be a first voltage sampling circuit 251, which is used to sample and obtain the first voltage signal Vup at both ends of the first secondary winding 232; the second sampling circuit corresponds to a second voltage sampling circuit 252, which is used to sample and obtain the second voltage signal Vdn at both ends of the second secondary winding 233.

[0064] The first proportional filtering and correction subcircuit 253 is used to receive the first voltage signal Vup sent by the first voltage sampling circuit 251 and the second voltage signal Vdn sent by the second voltage sampling circuit 252, so as to filter and correct the first voltage signal Vup and the second voltage signal Vdn in turn to obtain the first filtered signal and the second filtered signal, so as to provide a more suitable high-quality input for the control subcircuit 254, thereby effectively optimizing the overall performance and reliability of the main control circuit 25 to achieve efficient control.

[0065] The control subcircuit 254 is specifically configured to receive the first filtered signal and the second filtered signal, and to generate the first driving signal PWM1 and the second driving signal PWM2 respectively using the first filtered signal and the second filtered signal.

[0066] In one embodiment, the inverter circuit 21 specifically includes a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, and the resonant circuit 22 includes a resonant capacitor Cr and a resonant inductor Lr.

[0067] Among them, the first end of the first switch tube Q1 is coupled to the first end of the third switch tube Q3, and is used to couple with the first end of the DC power supply 102, the second end of the second switch tube Q2 is coupled to the second end of the fourth switch tube Q4, and is used to couple with the first end of the DC power supply 102, the second end of the first switch tube Q1 is coupled to the first end of the second switch tube Q2 and the first end of the resonant capacitor Cr, the second end of the third switch tube Q3 is coupled to the first end of the fourth switch tube Q4 and the second end of the primary winding 231, the second end of the resonant capacitor Cr is coupled to the first end of the resonant inductor Lr, the second end of the resonant inductor Lr is coupled to the first end of the primary winding 231, and the third end of each switch tube among the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 is coupled to the main control circuit 25.

[0068] Optionally, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 can specifically be 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, and the present application does not limit this.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] It is understandable that, in other embodiments, the inverter circuit 21 can specifically be any reasonable circuit form for converting DC to AC, such as a full-bridge circuit, a symmetrical half-bridge circuit, or an asymmetrical half-bridge circuit, and the present application does not limit this.

[0073] It can be seen that the inverter circuit 21 can specifically be a full-bridge inverter circuit 21, and in other embodiments, the inverter circuit 21 can specifically be any reasonable circuit form for realizing DC to AC conversion, such as a symmetrical half-bridge circuit or an asymmetrical half-bridge circuit, so as to receive the second control signal sent by the main control circuit 25, 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 second control signal, and adjust and control the current, voltage and frequency of the first DC signal received to convert it into the corresponding first AC signal, and the present application does not limit this.

[0074] Furthermore, in one embodiment, the power supply regulation circuit 20 specifically also includes an excitation inductor 26, that is, an excitation inductor Lm and a voltage stabilizing output circuit 27, the voltage stabilizing output circuit 27 includes a voltage stabilizing resistor Ro and a voltage stabilizing capacitor Co, the first switch sub-circuit 241 includes a fifth switch tube Q5, and the second switch sub-circuit 242 includes a sixth switch tube Q6.

[0075] Among them, the first end of the primary winding 231 is coupled to the first end of the resonant inductor Lr and the first end of the excitation inductor Lm, the second end of the primary winding 231 is coupled to the second end of the third switch tube Q3, the first end of the fourth switch tube Q4 and the second end of the excitation inductor Lm, the first end of the first secondary winding 232 is coupled to the first end of the fifth switch tube Q5, the second end of the fifth switch tube Q5 is coupled to the first end of the voltage-stabilizing resistor Ro and the second end of the sixth switch tube Q6, and is used to couple the first end of the load circuit 101, the second end of the first secondary winding 232 is coupled to the first end of the second secondary winding 233 and the second end of the voltage-stabilizing capacitor Co, and is used to couple the second end of the load circuit 101, the second end of the voltage-stabilizing resistor Ro is coupled to the first end of the voltage-stabilizing capacitor Co, the second end of the second secondary winding 233 is coupled to the first end of the sixth switch tube Q6, and the third end of the fifth switch tube Q5 and the third end of the sixth switch tube Q6 are coupled to the main control circuit 25.

[0076] It is understandable that the second AC signal is specifically converted into a pulsating DC signal via the power conversion circuit 24, that is, the half-bridge rectifier circuit; the pulsating DC signal is further rectified into a set DC voltage via the voltage-stabilizing output circuit 27 to be output to power the load circuit 101, thereby determining a stable DC output.

[0077] In one embodiment, the main control circuit 25 is further specifically used to obtain the second DC signal output by the power conversion circuit 24 to the load circuit 101, so as to compare the voltage of the second DC signal with the third voltage threshold, and determine the signal frequency and / or duty cycle of the third drive signal PWM*A and the fourth drive signal PWM*B based on the comparison difference between the second DC signal and the third voltage threshold, and then send the third drive signal PWM*A to the first switch tube Q1 and the fourth switch tube Q4 according to the currently determined signal frequency and / or duty cycle, and send the fourth drive signal PWM*B to the second switch tube Q2 and the third switch tube Q3, so as to trigger the first switch tube Q1, the fourth switch tube Q4, the second switch tube Q2 and the third switch tube Q3 to adjust their switching states, thereby converting the first DC signal into a first AC signal.

[0078] It is worth noting that the second DC signal includes a current signal and a voltage signal, and the third voltage threshold can be specifically understood as the target power supply requirement of the load circuit 101, such as the target setting value of the voltage, current or power of the power supply output currently required by the load circuit 101, and can also be understood as a preset target power supply signal.

[0079] The main control circuit 25 specifically utilizes the difference between the second DC signal and the third voltage threshold to dynamically adjust the signal frequency of the third drive signal PWM*A and the fourth drive signal PWM*B. For example, when it is determined that the second DC signal is less than the third voltage threshold, the current signal frequency and / or duty cycle of the third drive signal PWM*A and the fourth drive signal PWM*B is increased, and when it is determined that the second DC signal is greater than the third voltage threshold, the current signal frequency and / or duty cycle of the third drive signal PWM*A and the fourth drive signal PWM*B is decreased, until the second DC signal is adjusted to the target setting value of voltage, current or power, that is, within the range of the third voltage threshold, and the signal frequency and / or duty cycle of the third drive signal PWM*A and the fourth drive signal PWM*B currently in a stable state is determined.

[0080] Furthermore, in one embodiment, the main control circuit 35 further includes a second proportional filter correction subcircuit 255 , and the second proportional filter correction subcircuit 255 is coupled to the voltage stabilization output circuit 27 and the control subcircuit 254 .

[0081] The second proportional filter correction subcircuit 255 is used to receive the second DC signal sent by the voltage stabilizing output circuit 27, and to filter and correct the second DC signal in sequence to obtain a third filtered signal, so as to provide a more suitable high-quality input for the control subcircuit 254, thereby effectively optimizing the overall performance and reliability of the main control circuit 25 to achieve efficient control.

[0082] The control subcircuit 254 is further configured to receive the third filtered signal, and to generate a third driving signal PWM*A and a fourth driving signal PWM*B using the third filtered signal.

[0083] Please refer to Figure 4 and Figure 5 ,in, Figure 4 is a schematic diagram of the structure of the third embodiment of the power supply regulation circuit of the present application, Figure 5 yes Figure 4 Schematic diagram of the waveforms of the first current signal flowing through the first switch subcircuit and the second current signal flowing through the first switch subcircuit. The difference between the power supply regulation circuit in this embodiment and the second embodiment of the power supply regulation circuit provided in this application is that the first sampling circuit in the main control circuit 35 of the power supply regulation circuit 30 is specifically a first current sampling circuit 351, and the second sampling circuit is specifically a second current sampling circuit 352.

[0084] Specifically, the first sampling circuit is used to sample and obtain the first current signal Iup in the first switch sub-circuit 341 ; the second sampling circuit is used to sample and obtain the second current signal Idn in the second switch sub-circuit 342 .

[0085] The first proportional filtering and correction subcircuit 353 is used to receive the first current signal Iup sent by the first current sampling circuit 351 and the second current signal Idn sent by the second current sampling circuit 352, so as to filter and correct the first current signal Iup and the second current signal Idn in turn to obtain the first filtered signal and the second filtered signal, so as to provide a more suitable high-quality input for the control subcircuit 354, thereby effectively optimizing the overall performance and reliability of the main control circuit 35 to achieve efficient control.

[0086] The control subcircuit 354 is specifically configured to receive the first filtered signal and the second filtered signal, and to generate the first drive signal PWM1 and the second drive signal PWM2 respectively using the first filtered signal and the second filtered signal.

[0087] In one embodiment, the first control signal specifically includes a first drive signal PWM1 and a second drive signal PWM2, the second AC signal specifically includes a first current signal Iup flowing through the first switch sub-circuit 341 and a second current signal Idn flowing through the first switch sub-circuit 341, and the set reference threshold is specifically a current reference threshold I H , the current reference threshold I H The difference between 0 and 0 is the set current amplitude, and can be greater than 0, less than 0 or equal to 0. H When the current amplitude is greater than 0, the set current amplitude may specifically correspond to the switch action delay stage of the power conversion circuit 34, and the second AC signal may be H The current amplitude is reduced to 0.

[0088] The main control circuit 35 is specifically used to obtain the first current signal Iup and the second current signal Idn, so as to determine that the first current signal Iup is less than the current reference threshold I H When the first driving signal PWM1 is adjusted from the first level to the second level, the second driving signal PWM2 is adjusted from the second level to the first level simultaneously or after a delay of the set time Tdb.

[0089] The main control circuit 35 determines that the second current signal Idn is less than the current reference threshold I H Specifically, the second drive signal PWM2 is adjusted from the first level to the second level, and at the same time or with a delay of a set time length Tdb, the first drive signal PWM1 is adjusted from the second level to the first level, so as to periodically adjust the level states of the first drive signal PWM1 and the second drive signal PWM2, that is, the above-mentioned level change state is copied in each signal period Ts, thereby obtaining the first drive signal PWM1 and the second drive signal PWM2.

[0090] Among them, the first switch sub-circuit 341 is used to receive the first drive signal PWM1 to change the switch state under the action of the first drive signal PWM1, and the second switch sub-circuit 342 is used to receive the second drive signal PWM2 to change the switch state under the action of the second drive signal PWM2, and cooperate with the switch state of the first switch sub-circuit 341 to convert the second AC signal into a second DC signal, and use the negative current in the second AC signal, or the negative current in the second AC signal that is less than the set reference threshold, to increase the energy storage of the resonant circuit 32.

[0091] It is understandable that, due to the current reference threshold I H is equal to 0, or close to 0, and the first switch sub-circuit 341 and the second switch sub-circuit 342 are connected in series between the isolation transformer 33 and the load circuit 101, by H When the first driving signal PWM1 is adjusted from the first level to the second level, the first switch sub-circuit 341 is triggered to turn off, thereby effectively reducing the negative current in the second AC signal or the current in the second AC signal that is less than the current reference threshold I H The negative current returns to the primary side of the isolation transformer 33 to increase the energy storage of the resonant circuit 32, so that the energy storage of the resonant circuit 32 can be used to effectively extend the power-off holding time; the second drive signal PWM2 and the second switch sub-circuit 342 are similar and will not be described in detail here.

[0092] Optionally, the first current sampling circuit 351 and the second current sampling circuit 352 may specifically be current transformers, or resistors, or circuit units formed by connecting any reasonable circuit elements such as resistors and capacitors, which is not limited in the present application.

[0093] It can be understood that, in the present embodiment, the inverter circuit 31, the resonant circuit 32, the isolation transformer 33, the primary winding 331, the first secondary winding 332, the second secondary winding 333, the power conversion circuit 34, the first switch sub-circuit 341, the second switch sub-circuit 342, the main control circuit 35, the first proportional filter correction sub-circuit 353, the control sub-circuit 354, the second proportional filter correction sub-circuit 355, the excitation inductor 36 and the voltage stabilization output circuit 37 are respectively the same as the inverter circuit 21, the resonant circuit 22, the isolation transformer 23, the primary winding 231, the first secondary winding 232, the second secondary winding 233, the power conversion circuit 24, the first switch sub-circuit 241, the second switch sub-circuit 242, the main control circuit 25, the first proportional filter correction sub-circuit 253, the control sub-circuit 254, the second proportional filter correction sub-circuit 255, the excitation inductor 26 and the voltage stabilization output circuit 27. For details, please refer to Figure 2 And the related text content will not be repeated here.

[0094] This application also specifically adopts a power control method, see Figure 6 , Figure 6 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:

[0095] S41: receiving a first DC signal input.

[0096] It is understandable that the power control method in this embodiment is specifically a control method in which the power regulation circuit uses the external input direct current, and after corresponding regulation and control of the direct current, provides it to the load circuit. Among them, the power regulation circuit specifically includes an inverter circuit, a resonant circuit, an isolation transformer, an electric energy conversion circuit and a main control circuit, the resonant circuit is coupled to the inverter circuit, the isolation transformer is coupled to the resonant circuit, the electric energy conversion circuit is coupled to the isolation transformer, and is used to couple with the load circuit.

[0097] Specifically, the inverter circuit is used to receive a first DC signal input.

[0098] It is worth noting that the first DC signal can be specifically understood as the DC power input provided to the power regulation circuit by an external DC power supply, or it can be the DC power supply output after power conversion and regulation of a municipal power supply, a photovoltaic power supply, an independent generator or any other reasonable superior AC or DC power supply.

[0099] S42: Convert the first DC signal into a first AC signal.

[0100] Furthermore, the inverter circuit utilizes its internal switching action mechanism, such as the opening and closing action mechanism of switching devices such as IGBT, high-frequency transistor, MOS, etc., to quickly switch the DC power under signal control to generate an alternating voltage waveform and obtain a first AC signal.

[0101] S43: Adjust the first AC signal to a resonant current signal.

[0102] The resonant circuit receives the first AC signal sent by the inverter circuit, and performs one or more of any reasonable signal adjustments such as filtering, shaping, phase shifting, etc. on the first AC signal to obtain a resonant current signal, so as to achieve better output characteristics and ensure that subsequent links, such as power conversion circuits or loads, obtain more stable and efficient power.

[0103] S44: Convert the resonant current signal into a second AC signal.

[0104] The isolation transformer receives the resonant current signal sent by the resonant circuit and converts the resonant current signal into a second AC signal, using electromagnetic connection instead of electrical connection to achieve primary and secondary side safety electrical isolation and voltage matching, meeting the primary and secondary side electrical safety insulation requirements.

[0105] S45: Convert the second AC signal into a second DC signal to output to the load circuit.

[0106] The power conversion circuit receives a second AC signal sent by the isolation transformer, and utilizes high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to obtain a stable DC output, i.e., a second DC signal, using the second AC signal to output to the load circuit to meet the power usage of the load circuit.

[0107] S46: Compare the second AC signal with a set reference threshold to obtain a first control signal.

[0108] The main control circuit is used to continuously monitor the second AC signal from the power conversion circuit and compare the second AC signal with a set reference threshold to generate a first control signal based on the current comparison result, such as adjusting the level state of the first control signal in response to the voltage amplitude or current amplitude of the second AC signal being less than the set reference threshold to obtain a first control signal with a corresponding level change state.

[0109] Optionally, the first 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.

[0110] S47: Regulate the second DC signal using the first control signal.

[0111] The electric energy conversion circuit is specifically used to receive a first control signal sent by a main control circuit, and to utilize high-frequency rectification technology, such as PWM, synchronous rectification, reverse damping rectification, or any other reasonable rectification method, to change the switch state in response to the first control signal to convert the second AC signal into a second DC signal.

[0112] S48: Utilize the negative current in the second AC signal, or the negative current that is less than the set reference threshold, to increase the resonant current signal.

[0113] Among them, the power conversion circuit is specifically used to utilize the negative current in the second AC signal, or the negative current in the second AC signal that is less than the set reference threshold. That is, if a negative current appears in the second AC signal (the current direction flows from the load circuit to the isolation transformer), or when the amplitude of the negative current of the second AC signal is less than the set reference threshold, the power conversion circuit changes its switching state under the action of the first control signal to return the negative current or the negative current less than the set reference threshold to the primary side of the isolation transformer to increase the energy storage of the resonant circuit, that is, the resonant current signal.

[0114] S49: When the first DC signal is lower than the first voltage threshold, using the boosted resonant current signal to extend the time for which the second DC signal is within the second threshold range.

[0115] Furthermore, when the power supply regulating circuit is powered off, that is, when the input of the first DC signal decreases or disappears and is lower than the first voltage threshold, the main control circuit can use the boosted resonant current signal to extend the time for which the second DC signal is kept within the second voltage threshold.

[0116] It is worth noting that the first voltage threshold can be understood as the threshold range of the voltage of the first DC signal when the first DC signal is powered normally or the power regulation circuit maintains normal operation, so that when it is detected that the current voltage of the first DC signal is lower than the first threshold range, it can be determined that the input of the first DC signal has decreased or disappeared, that is, a power outage has occurred at present; the second threshold range can be understood as the voltage and current threshold range when the load circuit maintains normal operation, and the specific range can be determined by the actual application scenario, and the present application does not limit this.

[0117] In addition, in the operation of some special load circuits, 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 stops supplying power, it is necessary to maintain the power output provided to the load circuit for a certain period of time, that is, to effectively maintain the second DC 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.

[0118] See also Figure 7 , Figure 7 : 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 6 A flowchart of a detailed implementation of the power control method in the embodiment of the present invention specifically includes the following steps:

[0119] S51: Receive a first DC signal input.

[0120] S52: Convert the first DC signal into a first AC signal.

[0121] S53: Adjust the first AC signal to a resonant current signal.

[0122] S54: Convert the resonant current signal into a second AC signal.

[0123] S55: Convert the second AC signal into a second DC signal to output to the load circuit.

[0124] Among them, S51, S52, S53, S54 and S55 are Figure 6 S41, S42, S43, S44 and S45 are the same. Please refer to S41, S42, S43, S44 and S45 and their related text descriptions for details, which will not be repeated here.

[0125] S56: When the first voltage signal is less than the voltage reference threshold, the first driving signal is adjusted from the first level to the second level, and simultaneously or with a delay of a set time, the second driving signal is adjusted from the second level to the first level.

[0126] Specifically, the isolation transformer further includes a primary winding, a first secondary winding and a second secondary winding, and the power conversion circuit further includes a first switch sub-circuit and a second switch sub-circuit, the primary winding is coupled to the resonant circuit, the first switch sub-circuit is coupled to the first secondary winding, the second switch sub-circuit and the main control circuit, and is used to couple to the load circuit, the second switch sub-circuit is coupled to the second secondary winding and the main control circuit, and the primary winding is coupled to the first secondary winding and the second secondary winding.

[0127] Among them, the first control signal specifically also includes a first drive signal and a second drive signal, the second AC signal specifically also includes a first voltage signal at both ends of the first secondary winding and a second voltage signal at both ends of the second secondary winding, and the set reference threshold is specifically a voltage reference threshold, which is greater than 0 and close to 0.

[0128] The main control circuit is specifically used to obtain the first voltage signal and the second voltage signal, so that when it is determined that the first voltage signal is less than the voltage reference threshold, the first drive signal is adjusted from the first level to the second level, and the second drive signal is adjusted from the second level to the first level at the same time or with a delay of a set time.

[0129] S57: When the second voltage signal is less than the voltage reference threshold, the second driving signal is adjusted from the first level to the second level, and simultaneously or with a delay of a set time, the first driving signal is adjusted from the second level to the first level.

[0130] When the main control circuit determines that the second voltage signal is less than the voltage reference threshold, the main control circuit specifically adjusts the second drive signal from the first level to the second level, and simultaneously or with a delay of a set time, adjusts the first drive signal from the second level to the first level, so as to periodically adjust the level states of the first drive signal and the second drive signal, thereby obtaining the first drive signal and the second drive signal.

[0131] It is worth noting that the set duration can be specifically determined according to the delay time for the first switch sub-circuit and the second switch sub-circuit to trigger on or off, that is, the dead time, and the present application does not limit this.

[0132] In addition, when the first driving signal is at the first level, it can specifically trigger the first switch subcircuit to turn on, and when it is at the second level, it can trigger the first switch subcircuit to turn off; the second driving signal and the second switch subcircuit are similar, and will not be described in detail here.

[0133] Optionally, the first level may be a high level, and the second level may correspond to a low level or a 0 level; or, the first level may be a low level or a 0 level, and the second level may correspond to a high level, which is not limited in the present application.

[0134] S58: Regulate the second DC signal using the first drive signal and the second drive signal.

[0135] Among them, the first switch subcircuit is used to receive a first drive signal to change the switch state under the action of the first drive signal, and the second switch subcircuit is used to receive a second drive signal to change the switch state under the action of the second drive signal, and cooperate with the switch state of the first switch subcircuit to convert the second AC signal into a second DC signal.

[0136] S59: Utilize the negative current in the second AC signal to increase the resonant current signal.

[0137] Furthermore, the first switch subcircuit is also used to cooperate with the switch state of the second switch subcircuit to utilize the negative current in the second AC signal to increase the energy storage of the resonant circuit, that is, the resonant current signal.

[0138] It can be understood that since the voltage reference threshold is greater than 0 and close to 0, and the first switch sub-circuit and the second switch sub-circuit are connected in series between the isolation transformer and the load circuit, by adjusting the first drive signal from the first level to the second level when the first voltage signal is less than the voltage reference threshold, so as to trigger the first switch sub-circuit to shut down, the negative current in the second AC signal can be effectively returned to the primary side of the isolation transformer to increase the energy storage of the resonant circuit, so that the energy storage of the resonant circuit can be used to effectively extend the power-off holding time; the second drive signal and the second switch sub-circuit are the same and will not be repeated here.

[0139] S510: When the first DC signal is lower than the first voltage threshold, using the boosted resonant current signal to extend the time for which the second DC signal is within the second threshold range.

[0140] Among them, S510 and Figure 6 For details, please refer to S49 and its related text descriptions, which will not be repeated here.

[0141] See also Figure 8 , Figure 8: 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 6 A flowchart of a detailed implementation of the power control method in the embodiment of the present invention specifically includes the following steps:

[0142] S61: Receive a first DC signal input.

[0143] S62: Convert the first DC signal into a first AC signal.

[0144] S63: Adjust the first AC signal to a resonant current signal.

[0145] S64: Convert the resonant current signal into a second AC signal.

[0146] S65: Convert the second AC signal into a second DC signal to output to the load circuit.

[0147] Among them, S61, S62, S63, S64 and S65 are Figure 6 S41, S42, S43, S44 and S45 are the same. Please refer to S41, S42, S43, S44 and S45 and their related text descriptions for details, which will not be repeated here.

[0148] S66: When the first current signal is less than the current reference threshold, the first drive signal is adjusted from the first level to the second level, and simultaneously or with a delay of a set time, the second drive signal is adjusted from the second level to the first level.

[0149] Specifically, the isolation transformer further includes a primary winding, a first secondary winding and a second secondary winding, and the power conversion circuit further includes a first switch sub-circuit and a second switch sub-circuit, the primary winding is coupled to the resonant circuit, the first switch sub-circuit is coupled to the first secondary winding, the second switch sub-circuit and the main control circuit, and is used to couple to the load circuit, the second switch sub-circuit is coupled to the second secondary winding and the main control circuit, and the primary winding is coupled to the first secondary winding and the second secondary winding.

[0150] The first control signal specifically includes a first drive signal and a second drive signal, the second AC signal specifically includes a first current signal flowing through the first switch subcircuit and a second current signal flowing through the first switch subcircuit, and the set reference threshold is specifically a current reference threshold, the difference between the current reference threshold and 0 is a set current amplitude, and specifically can be greater than 0, less than 0 or equal to 0. When the current reference threshold is greater than 0, the set current amplitude can specifically correspond to the delay stage of the switch action of the electric energy conversion circuit, and the second AC signal can be reduced from the current reference threshold to the current amplitude corresponding to 0.

[0151] The main control circuit is specifically used to obtain the first current signal and the second current signal, so that when it is determined that the first current signal is less than the current reference threshold, the first drive signal is adjusted from the first level to the second level, and the second drive signal is adjusted from the second level to the first level at the same time or with a delay of a set time.

[0152] S67: When the second current signal is less than the current reference threshold, the second driving signal is adjusted from the first level to the second level, and the first driving signal is adjusted from the second level to the first level simultaneously or with a delay of a set time.

[0153] When the main control circuit determines that the second current signal is less than the current reference threshold, the main control circuit specifically adjusts the second drive signal from the first level to the second level, and simultaneously or with a delay of a set time, adjusts the first drive signal from the second level to the first level, so as to periodically adjust the level states of the first drive signal and the second drive signal, thereby obtaining the first drive signal and the second drive signal.

[0154] S68: Regulate the second DC signal using the first drive signal and the second drive signal.

[0155] The first switch subcircuit is used to receive a first drive signal to change the switch state under the action of the first drive signal. The second switch subcircuit is used to receive a second drive signal to change the switch state under the action of the second drive signal, and cooperate with the switch state of the first switch subcircuit to convert the second AC signal into a second DC signal.

[0156] S69: Utilize the negative current of the first current signal and the second current signal that is less than the current reference threshold to increase the resonant current signal.

[0157] Furthermore, the first switch subcircuit is also used to cooperate with the switch state of the second switch subcircuit to utilize the negative current in the second AC signal, or the negative current in the second AC signal that is less than the set reference threshold, to increase the energy storage of the resonant circuit, that is, the resonant current signal.

[0158] It can be understood that since the current reference threshold is equal to 0, or close to 0, and the first switch sub-circuit and the second switch sub-circuit are connected in series between the isolation transformer and the load circuit, by adjusting the first drive signal from the first level to the second level when the first current signal is less than the current reference threshold, so as to trigger the first switch sub-circuit to shut down, the negative current in the second AC signal, or the negative current in the second AC signal that is less than the current reference threshold, can be effectively returned to the primary side of the isolation transformer to increase the energy storage of the resonant circuit, so that the energy storage of the resonant circuit can be used to effectively extend the power-off holding time; the second drive signal and the second switch sub-circuit are the same and will not be repeated here.

[0159] S610: When the first DC signal is lower than the first voltage threshold, using the boosted resonant current signal to extend the time for which the second DC signal is within the second threshold range.

[0160] Among them, S610 and Figure 6 For details, please refer to S49 and its related text descriptions, which will not be repeated here.

[0161] It is understandable that in some other embodiments, the power regulation circuit specifically includes some other more specific circuit units to be able to implement other more specific control methods. For details, please refer to Figure 1-Figure 5 And related text descriptions will not be repeated here.

[0162] This application also specifically uses an electronic device, see Fig. 9 , Fig. 9 Schematic 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 regulating circuit 72 connected to the housing 71 .

[0163] 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.

[0164] It should be noted that the power supply regulating circuit 72 described in this embodiment is the power supply regulating circuit 10, the power supply regulating circuit 20 or the power supply regulating circuit 30 described in any one of the above embodiments. Figure 1-Figure 5 And the related text content will not be repeated here.

[0165] The beneficial effects of the present application are as follows: different from the prior art, the inverter circuit in the power supply regulation circuit provided by the present application is used to receive a first DC signal input to convert the first DC signal into a first AC signal, the resonant circuit regulates the first AC signal into a resonant current signal, the isolation transformer converts the resonant current signal into a second AC signal, the power conversion circuit is used to convert the second AC signal into a second DC signal to output to the load circuit, the main control circuit obtains the second DC signal to compare the second DC signal with a set reference threshold to obtain a first control signal, the power conversion circuit can use the first control signal to convert the second AC signal into a second DC signal, and use the negative current in the second DC signal, or the negative current less than the set reference threshold, to increase the energy storage of the resonant circuit, so that when the first DC signal is lower than the first voltage threshold, the energy storage of the resonant circuit is used to extend the holding time of the second DC signal within the second voltage threshold, 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, during the long-term operation of the power supply regulation circuit, the circuit energy loss is effectively reduced, the power supply efficiency and reliability are improved, and additional costs are avoided.

[0166] 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 regulating circuit, characterized in that: The power supply regulation circuit comprises: An inverter circuit, configured to receive a first DC signal input to convert the first DC signal into a first AC signal; a resonant circuit, coupled to the inverter circuit to receive the first AC signal sent by the inverter circuit and adjust the first AC signal to a resonant current signal; an isolation transformer coupled to the resonant circuit to receive the resonant current signal sent by the resonant circuit and convert the resonant current signal into a second AC signal; wherein the isolation transformer comprises a primary winding and a first secondary winding and a second secondary winding coupled to the primary winding; an electric energy conversion circuit, coupled to the isolation transformer and used to couple with a load circuit to receive the second AC signal sent by the isolation transformer, and convert the second AC signal into a second DC signal to output to the load circuit; wherein the electric energy conversion circuit further includes a first switch subcircuit and a second switch subcircuit, the primary winding is coupled to the resonant circuit, the first switch subcircuit is coupled to the first secondary winding, the second switch subcircuit and the main control circuit, and is used to couple with the load circuit, and the second switch subcircuit is coupled to the second secondary winding and the main control circuit; a main control circuit, coupled to the power conversion circuit, wherein the main control circuit obtains the second AC signal in the power conversion circuit to compare the second AC signal with a set reference threshold to obtain a first control signal; wherein the first control signal includes a first drive signal and a second drive signal; The electric energy conversion circuit receives the first control signal, uses the first control signal to convert the second AC signal into the second DC signal, and uses the negative current in the second AC signal, or the negative current less than the set reference threshold, to increase the energy storage of the resonant circuit, so that when the first DC signal is lower than the first voltage threshold, the energy storage of the resonant circuit is used to extend the holding time of the second DC signal within the second voltage threshold; Wherein, the second AC signal includes a first voltage signal at both ends of the first secondary winding and a second voltage signal at both ends of the second secondary winding, the set reference threshold is a voltage reference threshold, and the main control circuit is used to obtain the first voltage signal and the second voltage signal, so as to adjust the first drive signal from the first level to the second level when the first voltage signal is less than the voltage reference threshold, and adjust the second drive signal from the second level to the first level at the same time or with a delay of a set time, and when the second voltage signal is less than the voltage reference threshold, adjust the second drive signal from the first level to the second level, and adjust the first drive signal from the second level to the first level at the same time or with a delay of the set time; wherein, the voltage reference threshold is greater than 0; The first switch subcircuit and the second switch subcircuit are used to receive the first drive signal and the second drive signal respectively, so as to adjust the second DC signal and the energy storage of the resonant circuit by using the first drive signal and the second drive signal.

2. The power supply regulating circuit according to claim 1, characterized in that: The main control circuit is also used to obtain the second DC signal in the power conversion circuit, so as to compare the second AC signal with the set reference threshold to obtain the first control signal when the voltage of the second DC signal is greater than the voltage of the second AC signal.

3. The power supply regulating circuit according to claim 1, characterized in that: The second AC signal includes a first current signal flowing through the first switch subcircuit and a second current signal flowing through the first switch subcircuit, the set reference threshold is a current reference threshold, and the main control circuit is used to obtain the first current signal and the second current signal, so that when the first current signal is less than the current reference threshold, the first drive signal is adjusted from the first level to the second level, and at the same time or with a delay of the set time, the second drive signal is adjusted from the second level to the first level, and when the second current signal is less than the current reference threshold, the second drive signal is adjusted from the first level to the second level, and at the same time or with a delay of the set time, the first drive signal is adjusted from the second level to the first level; wherein the difference between the current reference threshold and 0 is the set current amplitude.

4. The power supply regulating circuit according to claim 3, characterized in that: The main control circuit further includes a first sampling circuit, a second sampling circuit, a first proportional filtering correction subcircuit and a control subcircuit, wherein the first sampling circuit is coupled to the first switch subcircuit and the first proportional filtering correction subcircuit, the second sampling circuit is coupled to the second switch subcircuit and the first proportional filtering correction subcircuit, the first proportional filtering correction subcircuit is coupled to the control subcircuit, and the control subcircuit is coupled to the first switch subcircuit and the second switch subcircuit; Wherein, the first sampling circuit is used to sample and obtain the first voltage signal at both ends of the first secondary winding and / or the first current signal in the first switch sub-circuit; The second sampling circuit is used for sampling and acquiring the second voltage signal at both ends of the second secondary winding and / or the second current signal in the second switch sub-circuit; The first proportional filtering correction subcircuit is used to receive the first voltage signal and the second voltage signal, and to filter and correct the first voltage signal and the second voltage signal in sequence to obtain a first filtered signal and a second filtered signal; and / or, the first proportional filtering correction subcircuit is used to receive the first current signal and the second current signal, and to filter and correct the first current signal and the second current signal in sequence to obtain a first filtered signal and a second filtered signal; The control subcircuit is used to receive the first filtered signal and the second filtered signal, so as to generate the first driving signal and the second driving signal respectively by using the first filtered signal and the second filtered signal.

5. The power supply regulating circuit according to claim 3, characterized in that: The inverter circuit includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, and the resonant circuit includes a resonant capacitor and a resonant inductor; Among them, the first end of the first switch tube is coupled to the first end of the third switch tube and is used to couple to the first end of the DC power supply, the second end of the second switch tube is coupled to the second end of the fourth switch tube and is used to couple to the first end of the DC power supply, the second end of the first switch tube is coupled to the first end of the second switch tube and the first end of the resonant capacitor, the second end of the third switch tube is coupled to the first end of the fourth switch tube and the second end of the primary winding, the second end of the resonant capacitor is coupled to the first end of the resonant inductor, the second end of the resonant inductor is coupled to the first end of the primary winding, 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 regulating circuit according to claim 5, characterized in that: The power supply regulation circuit further includes an excitation inductor and a voltage stabilization output circuit, the voltage stabilization output circuit includes a voltage stabilization resistor and a voltage stabilization capacitor, the first switch subcircuit includes a fifth switch tube, and the second switch subcircuit includes a sixth switch tube; Among them, the first end of the primary winding is coupled to the first end of the resonant inductor and the first end of the excitation inductor, the second end of the primary winding is coupled to the second end of the third switch tube, the first end of the fourth switch tube and the second end of the excitation inductor, the first end of the first secondary winding is coupled to the first end of the fifth switch tube, the second end of the fifth switch tube is coupled to the first end of the voltage-stabilizing resistor and the second end of the sixth switch tube, and is used to couple the first end of the load circuit, the second end of the first secondary winding is coupled to the first end of the second secondary winding and the second end of the voltage-stabilizing capacitor, and is used to couple the second end of the load circuit, the second end of the voltage-stabilizing resistor is coupled to the first end of the voltage-stabilizing capacitor, the second end of the second secondary winding is coupled to the first end of the sixth switch tube, and the third end of the fifth switch tube and the third end of the sixth switch tube are coupled to the main control circuit.

7. The power regulation circuit according to claim 6, characterized in that: The main control circuit is further used to obtain the second DC signal, compare the voltage of the second DC signal with a third voltage threshold, determine the signal frequency of the third drive signal and the fourth drive signal, and send the third drive signal and the fourth drive signal according to the signal frequency; The first switch tube and the fourth switch tube are used to receive the third drive signal, and the second switch tube and the third switch tube are used to receive the fourth drive signal, so as to convert the first DC signal into the first AC signal using the third drive signal and the fourth drive signal.

8. A power supply control method, characterized in that: The power control method comprises: receiving a first DC signal input; converting the first DC signal into a first AC signal; adjusting the first AC signal to a resonant current signal; Converting the resonant current signal into a second AC signal; converting the second AC signal into a second DC signal to output to a load circuit; The second AC signal is compared with a set reference threshold to obtain a first control signal; wherein the set reference threshold is a voltage reference threshold, the second AC signal includes a first voltage signal and a second voltage signal, and the first control signal includes a first drive signal and a second drive signal; the step of comparing the second AC signal with the set reference threshold to obtain the first control signal includes: when the first voltage signal is less than the voltage reference threshold, adjusting the first drive signal from the first level to the second level, and adjusting the second drive signal from the second level to the first level at the same time or after a delay of a set time; when the second voltage signal is less than the voltage reference threshold, adjusting the second drive signal from the first level to the second level, and adjusting the first drive signal from the second level to the first level at the same time or after a delay of the set time; wherein the voltage reference threshold is greater than 0; Using the first control signal to adjust the second DC signal; wherein the step of using the first control signal to adjust the second DC signal comprises: using the first drive signal and the second drive signal to adjust the second DC signal; Utilize the negative current in the second AC signal, or the negative current less than the set reference threshold, to increase the resonant current signal; wherein the step of utilizing the negative current less than the set reference threshold in the second AC signal to increase the resonant current signal comprises: utilizing the negative current in the second AC signal to increase the resonant current signal; When the first DC signal is lower than a first voltage threshold, the boosted resonant current signal is used to extend the time during which the second DC signal is within a second threshold range.

9. The power control method according to claim 8, characterized in that: The set reference threshold is a current reference threshold, the second AC signal includes a first current signal and a second current signal, the first control signal includes a first drive signal and a second drive signal, and the step of comparing the second AC signal with the set reference threshold to obtain the first control signal includes: When the first current signal is less than the current reference threshold, the first drive signal is adjusted from the first level to the second level, and the second drive signal is adjusted from the second level to the first level simultaneously or with a delay of a set time; wherein the difference between the current reference threshold and 0 is the set current amplitude; When the second current signal is less than the current reference threshold, adjusting the second drive signal from the first level to the second level, and adjusting the first drive signal from the second level to the first level simultaneously or with a delay of a set time; The step of regulating the second DC signal by using the first control signal comprises: adjusting the second DC signal using the first drive signal and the second drive signal; The step of using the negative current in the second AC signal that is less than the current reference threshold to increase the resonant current signal comprises: The resonant current signal is increased by using a negative current smaller than the current reference threshold in the first current signal and the second current signal.

10. An electronic device, characterized in that: The electronic device comprises a housing and a power regulating circuit connected to the housing; Wherein, the power supply regulation circuit is the power supply regulation circuit as claimed in any one of claims 1-7.

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