Power supply circuit and control method, control device, control circuit and power supply system thereof

Abstract

The embodiment of the invention provides a power supply circuit and a control method, a control device, a control circuit and a power supply system thereof, a bidirectional DC-DC circuit and an energy storage unit are arranged in the power supply circuit, and an energy storage function of a switching power supply circuit can be transferred to the energy storage unit, so that the circuit size of the switching power supply circuit is reduced, and the power supply efficiency is improved. Wherein a power device is easier to realize zero-voltage switching, when the output power of the switching power supply circuit can support normal operation of a load, the bidirectional DC-DC circuit only needs to maintain the voltage value of an energy storage unit and does not participate in power transmission and conversion with the load, and the power density and efficiency of a circuit structure participating in power transmission and conversion in the power supply circuit are increased; when the output power of the controllable switch circuit cannot support the normal operation of the load, the energy stored in the energy storage unit can be discharged to the energy storage unit through the rapid exchange of the electric energy transmission direction of the bidirectional DC-DC circuit, the normal operation of the load is maintained, and the reliability and the dynamic response speed of the power supply circuit are improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of power electronics, and in particular to a power supply circuit and a control method, a control device, a control circuit and a power supply system thereof. BACKGROUND

[0002] A data center is a globally coordinated network of special-purpose devices that deliver, accelerate, exhibit, compute, and store data information over the Internet infrastructure. The switching power supply circuit of the data center is an important part of the normal operation of the data center. How to improve the power density, efficiency and reliability of the power supply circuit and enhance the dynamic response speed of the power supply circuit has become the focus of research. SUMMARY

[0003] The present application provides a power supply circuit and a control method, a control device, a control circuit and a power supply system thereof to solve the above technical problems.

[0004] In a first aspect, the embodiments of the present application provide a power supply circuit, comprising: a switching power supply circuit, a bidirectional DC-DC circuit, an energy storage unit;

[0005] The first end of the switching power supply circuit is electrically connected with a commercial power supply, and the second end of the switching power supply circuit is electrically connected with a load;

[0006] The low-voltage side terminal of the bidirectional DC-DC circuit is electrically connected with the second end of the switching power supply circuit, and the high-voltage side terminal of the bidirectional DC-DC circuit is electrically connected with the energy storage unit;

[0007] The bidirectional DC-DC circuit is configured to conduct in a first direction to charge the energy storage unit when the operating parameter of the switching power supply circuit is within a corresponding preset operating parameter range; the first direction is from the low-voltage side terminal to the high-voltage side terminal of the bidirectional DC-DC circuit;

[0008] The bidirectional DC-DC circuit is configured to conduct in a second direction to discharge the energy storage unit when the operating parameter of the switching power supply circuit is not within the corresponding preset operating parameter range; the second direction is from the high-voltage side terminal to the low-voltage side terminal of the bidirectional DC-DC circuit;

[0009] When the operating parameter of the switching power supply circuit is within the corresponding preset operating parameter range, the difference between the output power of the switching power supply circuit and the power of the load is less than a preset power threshold.

[0010] In the technical solution, the bidirectional DC-DC circuit and the energy storage unit are arranged in the power supply circuit, the energy storage function of the switching power supply circuit is transferred to the energy storage unit, the energy storage device for realizing the energy storage function in the switching power supply circuit is cancelled or the size of the energy storage device is reduced, so that the circuit size of the switching power supply circuit is reduced, the power device is more likely to realize zero voltage switching, when the output power of the switching power supply circuit can support the normal operation of the load, the bidirectional DC-DC circuit only needs to maintain the voltage value of the energy storage unit and does not participate in the power transmission and conversion between the load, the power density and efficiency of the circuit structure participating in the power transmission and conversion in the power supply circuit are increased, and the energy stored in the energy storage unit can be discharged through the quick switching of the power transmission direction of the bidirectional DC-DC circuit when the output power of the controllable switching circuit cannot support the normal operation of the load, so as to support the normal operation of the load together with the switching power supply circuit, and the reliability and dynamic response speed of the power supply circuit are improved.

[0011] Optionally, the energy storage unit comprises a first capacitor.

[0012] The energy storage energy of the first capacitor is greater than or equal to the product of the rated output power of the switching power supply circuit and the preset power-off holding time.

[0013] The energy storage energy of the first capacitor is determined based on the square difference between the capacitance value of the first capacitor and the end value of the dischargeable voltage range.

[0014] Optionally, the preset power-off holding time is greater than or equal to the cycle time of the mains provided by the mains power supply.

[0015] In the technical solution, the energy available in the first capacitor in the energy storage unit can support the holding time required for the normal operation of the load after the switching power supply circuit is powered off, so as to maintain the normal operation of the load when the output power of the switching power supply circuit cannot support the normal operation of the load.

[0016] Optionally, the bidirectional DC-DC circuit comprises a non-isolated bidirectional DC-DC circuit.

[0017] The minimum value of the dischargeable voltage range is greater than or equal to the minimum value of the output voltage range of the switching power supply circuit.

[0018] Optionally, the bidirectional DC-DC circuit comprises an isolated bidirectional DC-DC circuit, and the isolated bidirectional DC-DC circuit comprises a transformer.

[0019] The minimum value of the dischargeable voltage range is greater than or equal to the product of the minimum value of the output voltage range of the switching power supply circuit and the reciprocal of the maximum gain of the isolated bidirectional DC-DC circuit.

[0020] Optionally, the switching power supply circuit comprises a second capacitor, and a capacitance of the second capacitor is less than a preset capacitance threshold.

[0021] In the technical solution, when the capacitor exists in the switching power supply circuit, the capacitance of the capacitor is less than the preset capacitance threshold, so that the size of the switching power supply circuit is reduced, and the power density of the switching power supply circuit is improved.

[0022] Optionally, the switching power supply circuit comprises a three-phase single-stage circuit.

[0023] In the technical solution, in the three-phase single-stage circuit, the bus capacitor in the two-pole type topology switching circuit is omitted, the power density of the switching power supply circuit caused by the low output power ratio of the bus capacitor in the two-pole type topology switching circuit is solved, the energy storage function of the bus capacitor is realized by the bidirectional DC-DC circuit and the energy storage unit, and the reliability of the power supply circuit is ensured.

[0024] Optionally, the power supply circuit further comprises an electromagnetic compatibility circuit, and the electromagnetic compatibility circuit is electrically connected between the commercial power supply and the switching power supply circuit.

[0025] In the technical solution, the electromagnetic compatibility circuit improves the anti-interference ability of the power supply circuit.

[0026] Optionally, the power supply circuit further comprises a battery backup unit.

[0027] The battery backup unit is electrically connected to the low-voltage side terminal of the bidirectional DC-DC circuit through a controllable switch.

[0028] In the technical solution, the battery backup unit can realize backup of the energy storage unit, so that when the energy storage amount in the energy storage unit and the output power of the switching power supply circuit are insufficient to support normal operation of the load, the load can still be maintained to operate normally.

[0029] In a second aspect, the embodiments of the present application provide a control method of a power supply circuit, the method is applied to a control circuit, the control circuit is electrically connected to the power supply circuit in any one of claims 1-8, and the method comprises the following steps.

[0030] Obtaining an operating parameter of the switching power supply circuit;

[0031] When the operating parameter is in a corresponding preset operating parameter range, outputting a first control signal, the first control signal is a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in a first direction;

[0032] output a second control signal when the operation parameter is not in the corresponding preset operation parameter range, the second control signal being a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in a second direction.

[0033] In the above technical solution, the control circuit monitors the operation state of the switching power supply circuit when the power supply circuit is operating to obtain the relationship between the output power of the switching power supply circuit and the load consumption power, outputs a first control signal when the switching power supply circuit can support normal operation of the load to maintain the energy storage state of the energy storage circuit, and outputs a second control signal when the switching power supply circuit cannot support normal operation of the load to maintain normal operation of the load by discharging the energy storage circuit, which can ensure the stability and dynamic response speed of the power supply circuit when the capacitance value of the energy storage capacitor in the switching power supply circuit is small or the energy storage capacitor is cancelled, improve the efficiency of the power supply circuit, and reduce the size of the switching power supply circuit and improve the power density.

[0034] Optionally, the operation parameter includes an input voltage.

[0035] The first control signal is output when the operation parameter is in the corresponding preset operation parameter range, and the second control signal is output when the operation parameter is not in the corresponding preset operation parameter range.

[0036] The first control signal is output when the input voltage is greater than or equal to a first preset input voltage threshold.

[0037] The second control signal is output when the input voltage is less than the first preset input voltage threshold.

[0038] The second control signal is output when the input voltage is less than the first preset input voltage threshold.

[0039] Optionally, the operation parameter includes an output voltage.

[0040] The first control signal is output when the operation parameter is in the corresponding preset operation parameter range, and the second control signal is output when the operation parameter is not in the corresponding preset operation parameter range.

[0041] The first control signal is output when the output voltage is greater than or equal to a second preset input voltage threshold.

[0042] The second control signal is output when the output voltage is less than the second preset input voltage threshold.

[0043] The second control signal is output when the output voltage is less than the second preset input voltage threshold.

[0044] Optionally, the operation parameter includes an output load current.

[0045] The first control signal is output when the operation parameter is in a corresponding preset operation parameter range, and the first control signal comprises:

[0046] The first control signal is output when the output load current is less than or equal to a preset output current threshold.

[0047] The second control signal is output when the operation parameter is not in the corresponding preset operation parameter range, and the second control signal comprises:

[0048] The second control signal is output when the output load current is greater than the preset output current threshold.

[0049] Optionally, the power supply circuit further comprises a battery backup unit.

[0050] The battery backup unit is electrically connected to the low-voltage side terminal of the bidirectional DC-DC circuit through a controllable switch.

[0051] The control terminal of the controllable switch is electrically connected to the control circuit,

[0052] Alternatively, the control circuit is electrically connected to a master controller, and the master controller is electrically connected to the control terminal of the controllable switch.

[0053] After obtaining the operation parameter of the switching power supply circuit, the method further comprises:

[0054] Obtaining the residual energy storage of the energy storage unit.

[0055] When the residual energy storage is less than a preset energy storage threshold and the operation parameter is not in the corresponding preset operation parameter range, an alarm signal is output.

[0056] The alarm signal is a signal for controlling the controllable switch to be turned on.

[0057] In a third aspect, an embodiment of the present application provides a control device of a power supply circuit, and the control device comprises:

[0058] An acquisition module is configured to obtain an operation parameter of a switching power supply circuit.

[0059] A processing module is configured to output a first control signal when the operation parameter is in a corresponding preset operation parameter range, and the first control signal is a signal for controlling a bidirectional DC-DC circuit in the power supply circuit to be turned on in a first direction.

[0060] The processing module is further configured to output a second control signal when the operation parameter is not in the corresponding preset operation parameter range, and the second control signal is a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to be turned on in a second direction.

[0061] In a fourth aspect, an embodiment of the present application provides a control circuit, comprising:

[0062] a processor, a memory, and a communication interface;

[0063] The memory is configured to store executable instructions of the processor.

[0064] The processor is configured to execute the method according to any one of the second aspect by executing the executable instructions.

[0065] In a fifth aspect, an embodiment of the present application provides a power supply system, comprising the power supply circuit according to any one of the first aspect, the control circuit according to the fourth aspect.

[0066] The power supply circuit and the control method, the control device, the control circuit and the power supply system provided by the embodiments of the present application can transfer the energy storage function of the switching power supply circuit to the energy storage unit, cancel the energy storage device for realizing the energy storage function in the switching power supply circuit or reduce the size of the energy storage device, so as to reduce the circuit size of the switching power supply circuit, and the power device in the switching power supply circuit is more likely to realize zero voltage switching. When the output power of the switching power supply circuit can support the normal operation of the load, the bidirectional DC-DC circuit only needs to maintain the voltage value of the energy storage unit and does not participate in the power transmission and conversion between the load, the power density and the efficiency of the circuit structure participating in the power transmission and conversion in the power supply circuit are increased, and the energy stored in the energy storage unit can be discharged through the quick switching of the power transmission direction of the bidirectional DC-DC circuit when the output power of the controllable switching circuit cannot support the normal operation of the load, so as to support the normal operation of the load together with the switching power supply circuit, and the reliability and the dynamic response speed of the power supply circuit are improved. BRIEF DESCRIPTION OF DRAWINGS

[0067] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0068] Figure 1 A structural schematic diagram of a power supply circuit in related technologies according to an exemplary embodiment of the present application is provided.

[0069] Figure 2 A circuit structure schematic diagram of a power supply circuit according to another exemplary embodiment of the present application is provided.

[0070] Figure 3A A circuit structure schematic diagram of a switching power supply circuit according to an exemplary embodiment of the present application is provided.

[0071] Figure 3BFIG. 1 is a circuit configuration diagram of a switching power supply circuit according to an example embodiment of the present application;

[0072] Figure 4A FIG. 2 is a circuit configuration diagram of an isolated bidirectional DC-DC circuit according to an example embodiment of the present application;

[0073] Figure 4B FIG. 3 is a circuit configuration diagram of an isolated bidirectional DC-DC circuit according to another example embodiment of the present application;

[0074] Figure 4C FIG. 4 is a circuit configuration diagram of an isolated bidirectional DC-DC circuit according to another example embodiment of the present application;

[0075] Figure 5A FIG. 5 is a circuit configuration diagram of a non-isolated bidirectional DC-DC circuit according to an example embodiment of the present application;

[0076] Figure 5B FIG. 6 is a circuit configuration diagram of a non-isolated bidirectional DC-DC circuit according to an example embodiment of the present application;

[0077] Figure 5C FIG. 7 is a circuit configuration diagram of a non-isolated bidirectional DC-DC circuit according to an example embodiment of the present application;

[0078] Figure 5D FIG. 8 is a circuit configuration diagram of a non-isolated bidirectional DC-DC circuit according to an example embodiment of the present application;

[0079] Figure 6 FIG. 9 is a circuit configuration diagram of a power supply system according to an example embodiment of the present application;

[0080] Figure 7 FIG. 10 is a flowchart of a control method of a power supply circuit according to an example embodiment of the present application;

[0081] Figure 8 FIG. 11 is a circuit configuration diagram of a power supply system according to another example embodiment of the present application;

[0082] Figure 9 FIG. 12 is a circuit configuration diagram of a power supply system according to another example embodiment of the present application;

[0083] Figure 10 FIG. 13 is a configuration diagram of a control device of a power supply circuit according to an example embodiment of the present application;

[0084] Figure 11 FIG. 14 is a configuration diagram of a control circuit according to an example embodiment of the present application.

[0085] The specific embodiments of the application will now be described in detail with reference to the following drawings. The following drawings and description are not intended to limit or restrict the scope of the application as it is encompassed by set forth in the appended claims. DETAILED DESCRIPTION

[0086] The exemplary embodiments will be described in detail with reference to the drawings. Unless specified otherwise, the same or similar components in the drawings are referred to by the same or similar reference numerals, and the description thereof will not be repeated. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0087] It should be noted that, in this document, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Also, the use of "a" or "an" preceding an element does not, without more constraints, foreclose the existence of other identical elements in the process, method, article, or apparatus that comprises the element. The same reference sign used in different embodiments of the application can have the same or different meaning.

[0088] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the application.

[0089] A data center is a globally coordinated network of special-purpose devices used to deliver, accelerate, exhibit, compute, and store data information over the Internet infrastructure. The switching power supply circuit of the data center is an important part of the normal operation of the data center.

[0090] Figure 1 The structure diagram of the power supply circuit in the related art according to an exemplary embodiment of the present application is shown in FIG. 1. Figure 1As shown, including: city power supply 101, switching power supply circuit 105, load 104. Among them, the switching power supply circuit 105 is a two-stage conversion circuit, the switching power supply circuit 105 includes Vienna power factor correction circuit (Power Factor Correction, referred to as: PFC), bus capacitor C1, C2 and two DC-DC circuit 103. Due to the complexity of the circuit, the power switch device in the PFC cannot realize zero voltage switching, and is limited by the DC-DC circuit 103, the energy stored in the bus capacitor can only be discharged by 30%~40%, and the bus capacitor voltage will drop to the case where it cannot output the full power required by the load, the utilization rate of the bus capacitor is not high, plus the bus capacitor volume is relatively large, the number of two-stage conversion magnetic devices is relatively large, which will cause the power density to decrease.

[0091] In other embodiments, the switching power supply circuit 105 includes a three-phase single-stage circuit, and one circuit structure of the three-phase single-stage circuit is as shown in Figure 3A The power device thereof is reduced by 30% compared with Figure 1 The two-stage topology shown, the magnetic device is reduced by about 40%, and the large volume of intermediate bus capacitor is also removed, simplifying the circuit structure, and the power switch device therein can realize zero voltage switching, improving the power density and efficiency, but the removal of the bus capacitor results in that the dynamic performance and short-time overload capacity of the switching power supply circuit 105 are worse than Figure 1 The two-stage topology shown.

[0092] The input side of the three-phase single-stage circuit has only the first capacitor C3 to store a little energy after at least one phase of the input side is powered off, and the output voltage range is narrow, such as the data voltage range of the 48V power bus is about 48~52V, and the normal working voltage of the load is 50V. Therefore, the output capacitor can only discharge about 2V, and the maintenance time is very short, resulting in poor stability of the power supply circuit.

[0093] How to improve the power density, efficiency and reliability of the power supply circuit and enhance the dynamic response speed of the power supply circuit has become the focus of research.

[0094] To solve the above technical problems, the application provides a power supply circuit and a control method, a control device, a control circuit and a power supply system thereof. The technical concept of the application is that a bidirectional DC-DC circuit and an energy storage unit are arranged in the power supply circuit, the energy storage function of the switching power supply circuit is transferred to the energy storage unit, the energy storage device for realizing the energy storage function in the switching power supply circuit is cancelled or the size of the energy storage device is reduced, so that the circuit size of the switching power supply circuit is reduced, the power device therein is more easily realized zero voltage switching, the output power of the switching power supply circuit can support the normal operation of the load, the bidirectional DC-DC circuit only needs to maintain the voltage value of the energy storage unit and does not participate in the power transmission and conversion between the load, the power density and efficiency of the circuit structure participating in the power transmission and conversion in the power supply circuit are increased, the energy stored in the energy storage unit can be discharged through the quick switching of the power transmission direction of the bidirectional DC-DC circuit when the output power of the controllable switching circuit cannot support the normal operation of the load, and the energy storage unit and the switching power supply circuit jointly support the normal operation of the load, thereby improving the reliability and dynamic response speed of the power supply circuit.

[0095] Figure 2 The structure schematic diagram of the power supply circuit provided by the application according to an exemplary embodiment is shown in FIG. 1. Figure 2 As shown in FIG. 1, the power supply circuit comprises a switching power supply circuit 105, a bidirectional DC-DC circuit 106 and an energy storage unit 107.

[0096] The first end of the switching power supply circuit 105 is electrically connected with the commercial power supply 101, the second end of the switching power supply circuit 105 is electrically connected with the load 104, the low-voltage side terminal of the bidirectional DC-DC circuit 106 is electrically connected with the second end of the switching power supply circuit 105, and the high-voltage side terminal of the bidirectional DC-DC circuit 106 is electrically connected with the energy storage unit 107.

[0097] The switching power supply circuit 105 converts the commercial voltage output by the commercial power supply 101 into the rated voltage value required for the operation of the load 104, and provides the power required for the operation of the load 104.

[0098] The bidirectional DC-DC circuit 106 is a circuit for transferring and converting the energy of direct current signals.

[0099] The bidirectional DC-DC circuit 106 is configured to conduct in a first direction to charge the energy storage unit 107 when the operating parameters of the switching power supply circuit 105 are within the corresponding preset operating parameter range; the first direction is from the low-voltage side terminal to the high-voltage side terminal of the bidirectional DC-DC circuit 106.

[0100] When the operating parameter of the switching power supply circuit 105 is not in the corresponding preset operating parameter range, the second direction is conducted, and the energy storage unit 107 is discharged; the second direction is from the high-voltage side terminal to the low-voltage side terminal of the bidirectional DC-DC circuit 106;

[0101] When the operating parameter of the switching power supply circuit 105 is in the corresponding preset operating parameter range, the difference between the output power of the switching power supply circuit 105 and the power of the load 104 is less than the preset power threshold, that is, the power output by the switching power supply circuit 105 cannot maintain the normal operation of the load 104, and the energy storage unit 107 needs to discharge through the bidirectional DC-DC circuit 106 to provide power for the load 104.

[0102] The energy storage unit 107 is a circuit for storing electrical energy.

[0103] More specifically, when the difference between the output power of the switching power supply circuit 105 and the power of the load 104 is greater than or equal to the preset power threshold, the bidirectional DC-DC circuit 106 charges the energy storage unit 107 until it is fully charged to a set voltage; when the control circuit 109 detects that the difference between the output power of the switching power supply circuit 105 and the power of the load 104 is less than the preset power threshold, the state of the bidirectional DC-DC circuit 106 changes from charging the energy storage unit 107 to discharging, converting the energy on the energy storage unit 107 to the second end of the switching power supply circuit 105 to maintain its output voltage within a set range and ensure sufficient power-off holding time. Since the energy storage unit 107 is fully charged, it enters a standby state, and the energy consumption of the bidirectional DC-DC circuit 106 and the energy storage unit 107 is extremely small, which hardly affects the efficiency of the entire machine.

[0104] In the above technical solution, the bidirectional DC-DC circuit and the energy storage unit are provided in the power supply circuit, the energy storage function of the switching power supply circuit can be transferred to the energy storage unit, the energy storage device for realizing the energy storage function in the switching power supply circuit can be canceled or the size of the energy storage device can be reduced, so that the circuit size of the switching power supply circuit is reduced, the power devices therein are more easily realized zero-voltage switching, when the output power of the switching power supply circuit can support the normal operation of the load, the bidirectional DC-DC circuit only needs to maintain the voltage value of the energy storage unit, and does not participate in the power transmission and conversion between the load, the power density and efficiency of the circuit structure participating in the power transmission and conversion in the power supply circuit are increased, the energy stored in the energy storage unit can be discharged through the rapid switching of the energy transmission direction of the bidirectional DC-DC circuit when the output power of the controllable switching circuit cannot support the normal operation of the load, and the normal operation of the load is jointly supported by the switching power supply circuit and the energy storage unit, which provides sufficient preparation time for the switching of the battery backup unit, improves the reliability and dynamic response speed of the power supply circuit.

[0105] Figure 3AA circuit structure schematic diagram of a switching power supply circuit 105 according to an exemplary embodiment provided by the present application is shown in FIG. 1, which includes a matrix control type three-phase single-stage circuit. The circuit structure on the primary winding side of the transformer T2 is a PFC circuit, and the output AC signal is converted into a DC signal by the rectifier circuit on the secondary winding side of the transformer T2 after electrical isolation by the transformer T2, to supply power to the load 104.

[0106] Compared with the two-stage conversion circuit shown in FIG. 2, the number of power devices and magnetic devices is reduced, the power devices can work in a zero-voltage switching state, the working frequency can be increased without much increase in switching loss, the size of the filter device is reduced, and the purposes of improving power density and efficiency can be achieved. Figure 1

[0107] A circuit structure schematic diagram of a switching power supply circuit 105 according to another exemplary embodiment provided by the present application is shown in FIG. 3, which is different from the circuit structure shown in FIG. 1 in that the circuit structure on the primary winding side of the transformer of the switching power supply circuit 105 is a three-phase three-level PFC circuit. This circuit has the advantages of reduced switching loss, smaller current ripple in the boost inductor, reduced electromagnetic interference, small harmonic content, and improved efficiency. Figure 3B Figure 3A The topology of the bidirectional DC-DC circuit 106 can have various implementation manners, including a non-isolated bidirectional DC-DC circuit 106 and an isolated bidirectional DC-DC circuit 106.

[0108] In some embodiments, the circuit structure of the isolated bidirectional DC-DC circuit 106 can be as shown in FIG. 4, where the bidirectional DC-DC conversion circuit is a dual active bridge (DAB) bidirectional DC-DC conversion circuit.

[0109] In some embodiments, the circuit structure of the isolated bidirectional DC-DC circuit 106 can be as shown in FIG. 5, where the bidirectional DC-DC conversion circuit is an LLC bidirectional DC-DC conversion circuit. Figure 4A Figure 4B Figure 4C In some embodiments, the circuit structure of the isolated bidirectional DC-DC circuit 106 can be as shown in FIG. 6, where the bidirectional DC-DC conversion circuit is a CLLC bidirectional symmetric DC-DC conversion circuit. Among them, the dual active bridge bidirectional DC-DC conversion circuit is the simplest, and the inductor can also be realized by the leakage inductance of the transformer, only one magnetic device is needed, which is beneficial to improve the power density. Compared with the dual active bridge bidirectional DC-DC conversion circuit, the LLC bidirectional DC-DC conversion circuit has strong anti-electromagnetic interference, and the CLLC bidirectional symmetric DC-DC conversion circuit can ensure the magnetic balance of the circuit compared with the LLC bidirectional DC-DC conversion circuit. Figure 4A Figure 4B Figure 4C In some embodiments, the circuit structure of the non-isolated bidirectional DC-DC circuit 106 can be as shown in FIG. 7, where the bidirectional DC-DC conversion circuit is a dual active bridge (DAB) bidirectional DC-DC conversion circuit.

[0110] In some embodiments, the circuit structure of the non-isolated bidirectional DC-DC circuit 106 can be as shown in FIG. 8, where the bidirectional DC-DC conversion circuit is an LLC bidirectional DC-DC conversion circuit. Figure 5A Figure 5B ,​​​​​​Figure 5C , Figure 5D As shown, where, Figure 5A It is a bidirectional Buck-Boost converter circuit. Figure 5B It is a bidirectional Buck / Boost converter circuit. Figure 5C It is a bidirectional Cuk converter circuit. Figure 5D It is a bidirectional Sepic-Zeta circuit. Compared with the isolated bidirectional DC-DC circuit 106, the non-isolated bidirectional DC-DC circuit 106 has a simpler structure, reduces the magnetoelectric conversion losses caused by isolation devices such as transformers, and has higher efficiency, lower cost, and lower low-frequency loss.

[0111] In some embodiments, the energy storage unit 107 includes a first capacitor;

[0112] The energy stored in the first capacitor is greater than or equal to the product of the rated output power of the switching power supply circuit 105 and the preset power-off holding time.

[0113] The energy stored in the first capacitor is determined based on the difference between the capacitance value of the first capacitor and the square of the values ​​at the ends of the discharge voltage range.

[0114] The preset power outage hold time is greater than or equal to the mains power cycle time.

[0115] The calculation method for the value of the first capacitor is explained below.

[0116] The first capacitor C3 is composed of one or more capacitors connected in parallel, generally a high-voltage electrolytic capacitor. In some embodiments, it can also be a low-voltage electrolytic capacitor, a supercapacitor, or other energy storage unit. Its capacity can be calculated and selected based on the output power and the preset power-off hold time. In some embodiments, for a switching power supply circuit 105 with a rated input three-phase 380VAC, a rated output voltage of 50V, an output current of 500A, and an output power of 25KW, the preset power-off hold time is set to one cycle time of the mains power, 20ms. Without considering the efficiency loss of the bidirectional DC-DC circuit, the first capacitor C3 needs to provide 25KW × 20ms = 500J of energy.

[0117] In some embodiments, the bidirectional DC-DC circuit 106 includes a non-isolated bidirectional DC-DC circuit 106;

[0118] The minimum discharge voltage range is greater than or equal to the minimum output voltage range of the switching power supply circuit 105. The capacitance of the first capacitor C3 can be calculated based on the energy it needs to provide (e.g., 500J) using the capacitor energy calculation formula. Where E represents the energy provided by the first capacitor C3, and C represents the capacitance of the first capacitor C3. This represents the square of the maximum voltage that the first capacitor can store based on the bidirectional DC-DC circuit 106. represents the square of the minimum value of the voltage that the first capacitor can release based on the bidirectional DC-DC circuit 106 to maintain the normal operation of the load 104, in the previous embodiment, the rated output voltage of the switching power supply circuit 105 is 50V, and the non-isolated bidirectional DC-DC circuit 106 can select V2 as 50V without considering the efficiency of the bidirectional DC-DC circuit 106, or can select V2 as a number exceeding the preset threshold of 50V when considering the efficiency of the bidirectional DC-DC circuit 106.

[0119] Based on the capacitance determined by the above-mentioned capacitance energy calculation formula and the preset capacitance margin, the number of electrolytic capacitors contained in the first capacitor and the capacitance of each electrolytic capacitor are determined.

[0120] In some embodiments, the bidirectional DC-DC circuit 106 includes an isolated bidirectional DC-DC circuit 106, and the isolated bidirectional DC-DC circuit 106 includes a transformer.

[0121] The minimum value of the dischargeable voltage range is greater than or equal to the product of the minimum value of the output voltage range of the switching power supply circuit 105 and the maximum gain inverse of the isolated bidirectional DC-DC circuit.

[0122] The maximum energy storage voltage of the first capacitor C3 corresponding to the isolated bidirectional DC-DC circuit 106 is lower than the safety voltage, or the output terminal of the circuit is inherently unsafe high voltage.

[0123] Compared with the capacitance value of the first capacitor C3 electrically connected to the non-isolated bidirectional DC-DC circuit 106 in the previous embodiment, when selecting V1 and V2 in the capacitance energy calculation formula, the minimum discharge voltage of the high-voltage side terminal needs to be determined based on the voltage of the low-voltage side terminal of the bidirectional DC-DC circuit 106 and the maximum gain inverse of the isolated bidirectional DC-DC circuit. The rated output voltage of the switching power supply circuit 105 is 50V, and the maximum gain inverse of the isolated bidirectional DC-DC circuit is 3, so that V2 can be selected as 50V x 3 = 150V without considering the efficiency of the bidirectional DC-DC circuit 106; or V2 can be selected as a number exceeding the preset threshold of 150V when considering the efficiency of the bidirectional DC-DC circuit 106.

[0124] When the energy storage voltage of the energy storage capacitor in the first capacitor C3 is set to 490V and the discharge termination voltage is 150V, the capacitance C required to store 500J of energy is 4600uF, and considering the ±20% capacitance range of the electrolytic capacitor, the capacitance required is 5520uF. Considering the efficiency of the bidirectional DC-DC circuit 106, the first capacitor C3 selected in this embodiment is 10 electrolytic capacitors with a capacitance of 560uF / 500V in parallel.

[0125] In the technical solution, the energy available in the energy storage unit can support normal operation of the load for at least one cycle of the commercial power after the switch power supply circuit is powered off, so that the output power of the switch power supply circuit cannot support normal operation of the load is maintained.

[0126] In some embodiments, the switch power supply circuit 105 includes a second capacitor, and a capacitance of the second capacitor is less than a preset capacitance threshold.

[0127] That is, the switch power supply circuit 105 can be applied Figure 1 The bus capacitor or other large-capacity capacitor in the two-stage conversion circuit shown needs to be set to have a capacitance less than a preset capacitance threshold in order to guarantee the energy density and efficiency of the circuit.

[0128] Even in the two-stage conversion circuit, the power supply circuit of the present application can be applied. Since the bidirectional DC-DC circuit 106 and the energy storage circuit added in the present application only work for a very short time, their efficiency and heat generation are no longer the focus of consideration. Therefore, their circuit design can be high-frequency and small-sized, and the power density is improved. The gain range of the switch power supply circuit 105 can be very wide, and the voltage of the energy storage circuit can maintain the output voltage stable in a very wide range, greatly improving the utilization rate of the energy storage circuit. In embodiments, the discharge termination voltage of the energy storage circuit can be as low as 150V, which is 30% of the highest voltage of 490V, and can discharge 90% of the energy stored in the capacitor. In the traditional two-stage conversion circuit, the discharge termination voltage of the bus capacitor can only reach about 75% to 80% of the highest voltage, and can discharge less than 45% of the energy stored in the capacitor. The power-off holding circuit of the present application can save half of the electrolytic capacitor.

[0129] In some embodiments, as Figure 6 shown, the power supply circuit further includes an electromagnetic compatibility circuit 108, which is electrically connected between the commercial power supply 101 and the switch power supply circuit 105.

[0130] In the technical solution, the electromagnetic compatibility circuit improves the anti-interference ability of the power supply circuit.

[0131] Figure 6 The circuit structure schematic diagram of the power supply system provided by the present application according to an exemplary embodiment is shown in Figure 6 shown, including the power supply circuit in the foregoing embodiments and a control circuit 109, the control circuit 109 and the power supply circuit are electrically connected.

[0132] In some embodiments, the control circuit 109 and the control ends of the power devices in the bidirectional DC-DC circuit 106 are electrically connected, and the control circuit 109 and the input end and the output end of the power supply circuit are electrically connected.

[0133] In some embodiments, the input end of the power supply circuit is provided with a first sampling circuit 110, and the output end is provided with a second sampling circuit 111. The power supply circuit is electrically connected with the first sampling circuit 110 and the second sampling circuit 111.

[0134] The first sampling circuit 110 is used for sampling the operating parameter related to the input end of the power supply circuit.

[0135] The second sampling circuit 111 is used for sampling the operating parameter related to the output end of the power supply circuit.

[0136] Based on the circuit structure shown in the figure, the application provides a control method of the power supply circuit. The execution subject of the method is the control circuit. As shown in the figure, the method comprises the following steps. Figure 6 Figure 7 The first sampling circuit 110 is used for sampling the operating parameter related to the input end of the power supply circuit.

[0137] S101, obtaining an operating parameter of a switching power supply circuit;

[0138] S102, when the operating parameter is within a corresponding preset operating parameter range, outputting a first control signal. The first control signal is a signal for controlling a bidirectional DC-DC circuit in the power supply circuit to conduct in a first direction.

[0139] When the operating parameter is within the corresponding preset operating parameter range, the output power of the switching power supply circuit can support normal operation of the load. The first control signal is outputted. The first control signal is a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in the first direction, so as to charge the energy storage unit by the switching power supply circuit.

[0140] S103, when the operating parameter is not within the corresponding preset operating parameter range, outputting a second control signal. The second control signal is a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in a second direction.

[0141] When the operating parameter is not within the corresponding preset operating parameter range, the output power of the switching power supply circuit cannot support normal operation of the load. The second control signal is outputted. The second control signal is a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in the second direction, so as to discharge the energy storage unit by the switching power supply circuit and supply power to the load.

[0142] The first direction and the second direction are opposite.

[0143] When the output power of the switching power supply circuit cannot support normal operation of the load, the bidirectional DC-DC circuit can immediately switch to the discharging state. The output voltage is stable within the voltage range for normal operation of the load, and there is no large voltage fluctuation. The dynamic response speed is fast.

[0144] ​In the above technical solution, when the power supply circuit is running, the control circuit monitors the operating status of the switching power supply circuit to obtain the relationship between the output power of the switching power supply circuit and the power consumed by the load. When the switching power supply circuit can support the normal operation of the load, it outputs a first control signal to maintain the energy storage state of the energy storage circuit. When the switching power supply circuit cannot support the normal operation of the load, it outputs a second control signal to control the energy storage circuit to discharge to the load in a timely manner to maintain the normal operation of the load. This control method can ensure the stability and dynamic response speed of the power supply circuit, improve the efficiency of the power supply circuit, reduce the size of the switching power supply circuit, and increase the power density when the capacitance value of the energy storage capacitor in the switching power supply circuit is small or the energy storage capacitor is eliminated.

[0145] In some embodiments, operating parameters include input voltage;

[0146] When the input voltage is greater than or equal to the first preset input voltage threshold, the control circuit outputs the first control signal.

[0147] When the input voltage is less than the first preset input voltage threshold, a second control signal is output.

[0148] If the input voltage is less than the first preset input voltage threshold, it indicates that the input voltage has lost power, phase is missing, or the voltage is abnormal.

[0149] In some embodiments, operating parameters include output voltage;

[0150] When the output voltage is greater than or equal to the second preset input voltage threshold, the control circuit outputs the first control signal.

[0151] When the output voltage is less than the second preset input voltage threshold, a second control signal is output.

[0152] An output voltage lower than the second preset input voltage threshold indicates that the output voltage is pulled down due to overload, or that the output voltage is reduced due to a power failure at the input of the switching power supply circuit.

[0153] In some embodiments, the operating parameters include the output load current;

[0154] When the output load current is less than or equal to the preset output current threshold, the control circuit outputs the first control signal.

[0155] When the output load current exceeds the preset output current threshold, a second control signal is output.

[0156] If the output load current is greater than the preset output current threshold, it indicates that the load power is overloaded.

[0157] In some embodiments, such as Figure 8 As shown, the power supply circuit also includes a battery backup unit 112;

[0158] The battery backup unit 112 is electrically connected through controllable switches K1 and K2 and the low-voltage side terminal of the bidirectional DC-DC circuit 106, and the first capacitor C3 is also electrically connected through controllable switches K3 and K4 and the high-voltage side terminal of the bidirectional DC-DC circuit 106, and the two controllable switches cannot be turned on at the same time.

[0159] In the above technical solution, the battery backup unit can realize backup of the energy storage unit, so that when the energy storage amount in the energy storage unit and the output power of the switching power supply circuit are insufficient to support normal operation of the load, the normal operation of the load can still be maintained.

[0160] In some embodiments, as shown in Figure 8 the control terminal of the controllable switch is electrically connected to the control circuit 109;

[0161] In some other embodiments, as shown in Figure 9 the control circuit 109 is electrically connected to the main controller 115, and the main controller 115 is electrically connected to the control terminal of the controllable switch;

[0162] The control circuit 109 obtains the remaining energy storage of the energy storage unit 107 after obtaining the operating parameters of the switching power supply circuit 105;

[0163] When the remaining energy storage is less than the preset energy storage threshold and the operating parameters are not within the corresponding preset operating parameter range, an alarm signal is output;

[0164] The alarm signal is a signal for controlling the controllable switch to be turned on.

[0165] The remaining energy storage can be determined by sampling the voltage value of the energy storage unit. When the sampling voltage value is less than the preset sampling voltage threshold and the bidirectional DC-DC circuit is turned on in the second direction, an alarm signal is output. The control circuit outputs a third control signal based on the alarm signal, or the control circuit transmits the alarm signal to the main controller, and the main controller outputs a third control signal based on the alarm signal to turn on the controllable switch corresponding to the power backup unit and turn off the controllable switch corresponding to the energy storage unit.

[0166] In some embodiments, the main controller is further configured to output an alarm signal based on the alarm signal or transmit alarm information to a device used by a worker.

[0167] Figure 10 The structure of the control device of the power supply circuit provided in the present application is shown in the figure. As shown in Figure 10 the control device 400 of the power supply circuit provided in the present application includes:

[0168] The acquisition module 401 is configured to obtain the operating parameters of the switching power supply circuit;

[0169] The processing module 402 is configured to output a first control signal when the operating parameter is within a corresponding preset operating parameter range, the first control signal being a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in a first direction.

[0170] The processing module 402 is further configured to output a second control signal when the operating parameter is not within the corresponding preset operating parameter range, the second control signal being a signal for controlling the bidirectional DC-DC circuit in the power supply circuit to conduct in a second direction.

[0171] In some possible embodiments, the processing module 402 is specifically configured to:

[0172] output the first control signal when the input voltage is greater than or equal to a first preset input voltage threshold;

[0173] output the second control signal when the input voltage is less than the first preset input voltage threshold;

[0174] The operating parameter includes the input voltage.

[0175] In some possible embodiments, the processing module 402 is specifically configured to:

[0176] output the first control signal when the output voltage is greater than or equal to a second preset input voltage threshold;

[0177] output the second control signal when the output voltage is less than the second preset input voltage threshold;

[0178] The operating parameter includes the output voltage.

[0179] In some possible embodiments, the processing module 402 is specifically configured to:

[0180] output the first control signal when the output load current is less than or equal to a preset output current threshold;

[0181] output the second control signal when the output load current is greater than the preset output current threshold;

[0182] The operating parameter includes the output load current.

[0183] In some possible embodiments, the processing module 402 is further configured to:

[0184] obtain a residual energy storage of the energy storage unit;

[0185] output an alarm signal when the residual energy storage is less than a preset energy storage threshold and the operating parameter is not within the corresponding preset operating parameter range;

[0186] The alarm signal is a signal for controlling the controllable switch to conduct.

[0187] The power supply circuit further comprises a battery backup unit;

[0188] The battery backup unit is electrically connected to the low-voltage side terminal of the controllable switch and the bidirectional DC-DC circuit;

[0189] The control terminal of the controllable switch is electrically connected to the control circuit,

[0190] Alternatively, the control circuit is electrically connected to a master controller, and the master controller is electrically connected to the control terminal of the controllable switch.

[0191] Figure 11 The control circuit provided in the present application is shown in a structural schematic diagram. As shown in the structural schematic diagram, Figure 11 the control circuit 500 provided in the present embodiment comprises at least one processor 501 and a memory 502. Optionally, the control circuit 500 further comprises a communication component. The processor 501, the memory 502 and the communication component are connected through a bus.

[0192] In the specific implementation process, the at least one processor 501 executes the computer execution instructions stored in the memory 502, so that the at least one processor 501 executes the above-mentioned method.

[0193] The specific implementation process of the processor 501 can be referred to the above-mentioned method embodiment, which has similar implementation principles and technical effects, and will not be described here in detail.

[0194] In the above-mentioned embodiment, it should be understood that the processor can be a central processing unit (English: Central Processing Unit, for short: CPU), and can also be other general-purpose processors, digital signal processors (English: Digital Signal Processor, for short: DSP), application specific integrated circuits (English: Application Specific Integrated Circuit, for short: ASIC) and the like. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor, etc. The steps of the method disclosed in the present application can be directly embodied as the execution of the hardware processor, or executed by the combination of the hardware and software modules in the processor.

[0195] The memory can contain a random access memory (Random Access Memory, for short: RAM), and can also include a non-volatile memory (Non-volatile Memory, for short: NVM), for example, at least one disk memory.

[0196] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application does not limit to only one bus or one type of bus.

[0197] The present application also provides a power supply system, comprising the power supply circuit and the control circuit in the foregoing embodiments, and the specific circuit structure can be referred to as shown in Figure 6 、 Figure 8 、 Figure 9

[0198] The present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the method described above.

[0199] The present application also provides a computer readable storage medium, which stores computer execution instructions, and when a processor executes the computer execution instructions, the method described above is implemented.

[0200] The readable storage medium described above can be realized by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk. The readable storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0201] An exemplary readable storage medium is coupled to the processor, so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist as discrete components in the device.

[0202] ​The division of units is only a logical function division, and actual implementation can have another division manner, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0203] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, can be located in one place, or can be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0204] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0205] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0206] Those skilled in the art can understand that all or part of the steps of the above-mentioned method embodiments can be completed by program instruction related hardware. The aforementioned program can be stored in a computer readable storage medium. The program executes the steps including the above-mentioned method embodiments when executed; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk, and various program code storage media.

[0207] It should be understood that many of the materials and devices exemplified in this disclosure are articles of manufacture (i.e., articles of manufacture) according to this disclosure. The articles of manufacture can be manufactured as such or can be manufactured by combining the materials and devices exemplified in this disclosure. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It should be understood that, in some embodiments, equivalents to the specific electrode structures and / or methods described herein can be employed without departing from the scope of the application. Accordingly, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," "having," "containing," "carrying" or like terms is used herein to convey the inclusion of the recited item but does not imply that any or all additional or other items are excluded, unless the context clearly dictates otherwise. It is finally to be understood that, while the application has been described in conjunction with specific embodiments thereof, the application is not limited to the specific embodiments specifically described hereinabove. Rather, it is contemplated that the described embodiments are merely illustrative of the application and that other embodiments can be devised by those skilled in the art without departing from the scope of the application. Accordingly, the scope of the application is to be construed as broadly as the language and the equivalents thereof permit.

Claims

1. A power supply circuit, characterized in that, The power supply circuit includes: a switching power supply circuit, a bidirectional DC-DC circuit, and an energy storage unit; The first terminal of the switching power supply circuit is electrically connected to the mains power supply, and the second terminal of the switching power supply circuit is electrically connected to the load. The low-voltage side terminal of the bidirectional DC-DC circuit is electrically connected to the second terminal of the switching power supply circuit, and the high-voltage side terminal of the bidirectional DC-DC circuit is electrically connected to the energy storage unit. The bidirectional DC-DC circuit is configured to conduct along a first direction to charge the energy storage unit when the operating parameters of the switching power supply circuit are within the corresponding preset operating parameter range; the first direction is from the low-voltage side terminal to the high-voltage side terminal of the bidirectional DC-DC circuit. When the operating parameters of the switching power supply circuit are not within the corresponding preset operating parameter range, the circuit is turned on in the second direction to discharge the energy storage unit; the second direction is the direction from the high-voltage side terminal to the low-voltage side terminal of the bidirectional DC-DC circuit. When the operating parameters of the switching power supply circuit are within the corresponding preset operating parameter range, the difference between the output power of the switching power supply circuit and the power of the load is less than a preset power threshold.

2. The power supply circuit according to claim 1, characterized in that, The energy storage unit includes a first capacitor; The energy stored in the first capacitor is greater than or equal to the product of the rated output power of the switching power supply circuit and the preset power-off holding time. The energy stored in the first capacitor is determined based on the square difference between the capacitance value of the first capacitor and the end value of the discharge voltage range.

3. The power supply circuit according to claim 2, characterized in that, The preset power outage holding time is greater than or equal to the cycle time of the mains power supplied by the mains power source.

4. The power supply circuit according to claim 2, characterized in that, The bidirectional DC-DC circuit includes a non-isolated bidirectional DC-DC circuit; The minimum value of the dischargeable voltage range is greater than or equal to the minimum value of the output voltage range of the switching power supply circuit.

5. The power supply circuit according to claim 2, characterized in that, The bidirectional DC-DC circuit includes an isolated bidirectional DC-DC circuit, and the isolated bidirectional DC-DC circuit includes a transformer; The minimum value of the dischargeable voltage range is greater than or equal to the product of the minimum value of the output voltage range of the switching power supply circuit and the reciprocal of the maximum gain of the isolated bidirectional DC-DC circuit.

6. The power supply circuit according to any one of claims 1 to 5, characterized in that, The switching power supply circuit includes a second capacitor, the capacitance of which is less than a preset capacitance threshold.

7. The power supply circuit according to any one of claims 1 to 5, characterized in that, The switching power supply circuit includes a three-phase single-stage circuit.

8. The power supply circuit according to any one of claims 1 to 5, characterized in that, The power supply circuit also includes an electromagnetic compatibility circuit, which is electrically connected between the mains power supply and the switching power supply circuit.

9. The power supply circuit according to any one of claims 1 to 5, characterized in that, The power supply circuit also includes a battery backup unit; The battery backup unit is electrically connected to the low-voltage side terminal of the bidirectional DC-DC circuit via a controllable switch.

10. A control method for a power supply circuit, characterized in that, The method is applied to a control circuit, wherein the control circuit is electrically connected to the power supply circuit according to any one of claims 1-9, and the method includes: Obtain the operating parameters of the switching power supply circuit; When the operating parameters are within the corresponding preset operating parameter range, a first control signal is output. The first control signal is a signal that controls the bidirectional DC-DC circuit in the power supply circuit to conduct along the first direction. When the operating parameters are not within the corresponding preset operating parameter range, a second control signal is output. The second control signal is a signal that controls the bidirectional DC-DC circuit in the power supply circuit to conduct along the second direction.

11. The control method according to claim 10, characterized in that, The operating parameters include the input voltage; When the operating parameters are within the corresponding preset operating parameter range, the first control signal is output, including: When the input voltage is greater than or equal to a first preset input voltage threshold, a first control signal is output; When the operating parameters are not within the corresponding preset operating parameter range, the second control signal is output, including: When the input voltage is less than the first preset input voltage threshold, a second control signal is output.

12. The control method according to claim 10, characterized in that, The operating parameters include the output voltage; When the operating parameters are within the corresponding preset operating parameter range, the first control signal is output, including: When the output voltage is greater than or equal to the second preset input voltage threshold, a first control signal is output; When the operating parameters are not within the corresponding preset operating parameter range, the second control signal is output, including: When the output voltage is less than the second preset input voltage threshold, a second control signal is output.

13. The control method according to claim 10, characterized in that, The operating parameters include the output load current; When the operating parameters are within the corresponding preset operating parameter range, the first control signal is output, including: When the output load current is less than or equal to a preset output current threshold, a first control signal is output; When the operating parameters are not within the corresponding preset operating parameter range, the second control signal is output, including: When the output load current is greater than the preset output current threshold, a second control signal is output.

14. The control method according to any one of claims 10 to 13, characterized in that, The power supply circuit also includes a battery backup unit; The battery backup unit is electrically connected to the low-voltage side terminal of the bidirectional DC-DC circuit via a controllable switch. The control terminal of the controllable switch is electrically connected to the control circuit. Alternatively, the control circuit and the main controller are electrically connected, and the main controller and the control terminal of the controllable switch are electrically connected; After obtaining the operating parameters of the switching power supply circuit, the method further includes: Obtain the remaining stored energy from the energy storage unit; An alarm signal is output when the remaining energy storage is less than a preset energy storage threshold and the operating parameters are not within the corresponding preset operating parameter range; The alarm signal is used to control the controllable switch to turn on.

15. A control device for a power supply circuit, characterized in that, The control device includes: The acquisition module is used to obtain the operating parameters of the switching power supply circuit; The processing module is configured to output a first control signal when the operating parameters are within the corresponding preset operating parameter range. The first control signal is a signal that controls the bidirectional DC-DC circuit in the power supply circuit to conduct along a first direction. The processing module is also used to output a second control signal when the operating parameters are not within the corresponding preset operating parameter range. The second control signal is a signal that controls the bidirectional DC-DC circuit in the power supply circuit to conduct along the second direction.

16. A control circuit, characterized in that, include: Processor, memory, communication interface; The memory is used to store the executable instructions of the processor; The processor is configured to perform the method of any one of claims 10-14 by executing the executable instructions.

17. A power supply system, characterized in that, It includes the power supply circuit as described in any one of claims 1-9 and the control circuit as described in claim 16.

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