Power supply circuit and power supply system

Abstract

The present application discloses a power supply circuit and a power supply system. The power supply circuit includes a first isolation conversion module or a second isolation conversion module, a first switch module and a second switch module. The first isolation conversion module converts the second power supply into a third power supply; the first switch module is turned on when the AC input power supply is greater than the first voltage threshold and the third power supply is greater than or equal to the first power supply; the second switch module is turned on when the DC input power supply is greater than the second voltage threshold and the first power supply is greater than or equal to the third power supply. The second isolation conversion module converts the AC input power supply into a DC fourth power supply isolated from the AC input power supply; the first switch module is turned on when the AC input power supply is greater than the first voltage threshold and the fourth power supply is greater than or equal to the first power supply; the second switch module is turned on when the DC input power supply is greater than the second voltage threshold and the first power supply is greater than or equal to the fourth power supply. Through the above method, the purpose of reducing costs can be achieved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power supply circuit and a power supply system. Background Art

[0002] In photovoltaic energy storage or energy storage power supply systems, the auxiliary power supply generally needs to be able to draw power from the grid side and the battery side to power the control unit.

[0003] When power is drawn from the grid, the auxiliary power supply typically not only powers the control unit but also other units, such as fans used for cooling. This can cause interference between the control unit and other units, potentially failing to meet safety regulations.

[0004] Furthermore, in order to meet safety regulations, an additional auxiliary power supply is usually required to power the control unit separately, resulting in high costs. Summary of the Invention

[0005] The present application aims to provide a power supply circuit and a power supply system that can achieve the purpose of reducing costs.

[0006] To achieve the above objectives, in a first aspect, the present application provides a power supply circuit, the power supply circuit being used to power a controller, the power supply circuit being further used to be connected to a DC auxiliary power supply and an AC auxiliary power supply, respectively, wherein the DC auxiliary power supply is used to convert a DC input power supply into a first DC power supply, and the AC auxiliary power supply is used to convert an AC input power supply into a second DC power supply, the power supply circuit comprising:

[0007] A first isolation conversion module or a second isolation conversion module, a first switch module and a second switch module;

[0008] When the power supply circuit includes the first isolation conversion module,

[0009] The first isolation conversion module is connected between the AC auxiliary power supply and the first switch module, and is used to convert the second power supply into a third power supply and isolate the second power supply from the third power supply;

[0010] The first switch module is connected between the first isolation conversion module and a first node. The first switch module is configured to be turned on when the voltage of the AC input power source is greater than a first voltage threshold and the voltage of the third power source is greater than or equal to the voltage of the first power source, so as to output a voltage for powering the controller at the first node based on the voltage of the third power source. The first node is a connection point between the first switch module and the second switch module.

[0011] The second switch module is connected between the DC auxiliary power supply and the first node, and is configured to be turned on when the voltage of the DC input power supply is greater than a second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the third power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply;

[0012] When the power supply circuit includes the second isolation conversion module,

[0013] The second isolation conversion module is connected between the AC auxiliary power supply and the first switch module, and is used to convert the AC input power supply into a fourth DC power supply isolated from the AC input power supply;

[0014] The first switch module is connected between the second isolation conversion module and the first node, and is configured to be turned on when the voltage of the AC input power source is greater than the first voltage threshold and the voltage of the fourth power source is greater than or equal to the voltage of the first power source, so as to output a voltage for powering the controller at the first node based on the voltage of the fourth power source;

[0015] The second switch module is connected between the DC auxiliary power supply and the first node. The second switch module is configured to be turned on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the fourth power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply.

[0016] In an optional manner, the DC auxiliary power supply is further used to convert the DC input power supply into a fifth DC power supply, and the voltage polarity of the fifth power supply is opposite to that of the first power supply;

[0017] The power supply circuit further includes: a third switch module and a fourth switch module;

[0018] When the power supply circuit includes the first isolation conversion module,

[0019] The first isolation conversion module is further configured to convert the second power supply into a sixth power supply and isolate the second power supply from the sixth power supply;

[0020] The third switch module is connected between the first isolation conversion module and a second node. The third switch module is configured to be turned on when the voltage of the AC input power source is greater than the first voltage threshold and the voltage of the sixth power source is less than or equal to the voltage of the fifth power source, so as to output a voltage for powering the controller at the second node based on the voltage of the sixth power source. The second node is a connection point between the third switch module and the fourth switch module, and the voltage polarity of the sixth power source is opposite to that of the second power source.

[0021] The fourth switch module is connected between the DC auxiliary power supply and the second node, and is configured to be turned on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the fifth power supply is less than or equal to the voltage of the sixth power supply, so as to output a voltage for powering the controller at the second node based on the voltage of the fifth power supply;

[0022] When the power supply circuit includes the second isolation conversion module,

[0023] The second isolation conversion module is further configured to convert the AC input power into a seventh DC power supply isolated from the AC input power supply;

[0024] The third switch module is connected between the second isolation conversion module and the second node, and is configured to be turned on when the voltage of the AC input power supply is greater than a first voltage threshold and the voltage of the seventh power supply is less than or equal to the voltage of the fifth power supply, so as to output a voltage for powering the controller at the second node based on the voltage of the seventh power supply;

[0025] The fourth switch module is connected between the DC auxiliary power supply and the second node. The fourth switch module is configured to be turned on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the fifth power supply is less than or equal to the voltage of the seventh power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the fifth power supply.

[0026] In an optional manner, the power supply circuit further includes a first charge and discharge module, a second charge and discharge module, a third charge and discharge module and a fourth charge and discharge module;

[0027] The first charge and discharge module is connected between the first node and the ground, and the second charge and discharge module is connected between the second node and the ground;

[0028] When the power supply circuit includes a first isolation conversion module, the third charge and discharge module is connected between a third node between the first switch module and the first isolation conversion module and the ground, and the fourth charge and discharge module is connected between a fourth node between the third switch module and the first isolation conversion module and the ground;

[0029] When the power supply circuit includes a second isolation conversion module, the third charge and discharge module is connected between a fifth node between the first switch module and the second isolation conversion module and the ground, and the fourth charge and discharge module is connected between a sixth node between the third switch module and the second isolation conversion module and the ground;

[0030] The first charge and discharge module, the second charge and discharge module, the third charge and discharge module, and the fourth charge and discharge module are all used for filtering and maintaining the stability of corresponding power supplies.

[0031] In an optional manner, when the power supply circuit includes the second isolation conversion module, the power supply circuit further includes a first voltage conversion module;

[0032] The first voltage conversion module is connected between the second isolation conversion module and the first switch module, and the first voltage conversion module is used to convert the fourth power supply into a stable eighth power supply;

[0033] The first switch module is further configured to be turned on when the voltage of the AC input power source is greater than the first voltage threshold and the voltage of the eighth power source is greater than or equal to the voltage of the first power source, so as to output a voltage for powering the controller at the first node based on the voltage of the eighth power source;

[0034] The second switch module is also used to turn on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the eighth power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply.

[0035] In an optional manner, the first isolation conversion module includes a transformer, and the transformer includes a primary winding, a first secondary winding, and a second secondary winding;

[0036] The first end of the primary winding is connected to the first output end of the AC auxiliary power supply, the second end of the primary winding is connected to the second output end of the AC auxiliary power supply, the first end of the first secondary winding is connected to the first node through the first switch module, the second end of the first secondary winding and the first end of the second secondary winding are both grounded, and the second end of the second secondary winding is connected to the second node through the third switch module.

[0037] In an optional manner, the second isolation conversion module includes a third secondary winding, a fourth secondary winding, a first diode and a second diode;

[0038] A first end of the third secondary winding is connected to the anode of the first diode, a second end of the third secondary winding and a first end of the fourth secondary winding are both grounded, a second end of the fourth secondary winding is connected to the cathode of the second diode, the cathode of the first diode is connected to the first node via the first switch module, and the anode of the second diode is connected to the second node via the third switch module;

[0039] The third secondary winding and the fourth secondary winding are both coupled to the same magnetic core as the primary winding in the AC auxiliary power supply 300 .

[0040] In an optional manner, the second isolation conversion module further includes a first filter inductor, a second filter inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor;

[0041] The first end of the first filter inductor is respectively connected to the first switch module and the first end of the first filter capacitor, the second end of the first filter inductor is respectively connected to the cathode of the first diode and the first end of the second filter capacitor, the second end of the first filter capacitor, the second end of the second filter capacitor, the second end of the third filter capacitor and the second end of the fourth filter capacitor are all grounded, the first end of the third filter capacitor is respectively connected to the first end of the second filter inductor and the third switch module, and the second end of the second filter inductor is respectively connected to the first end of the fourth filter capacitor and the anode of the second diode.

[0042] In an optional manner, the first switch module, the second switch module, the third switch module and the fourth switch module all include diodes;

[0043] The forward conduction of the diode in the first switch module corresponds to the conduction of the first switch module, the forward conduction of the diode in the second switch module corresponds to the conduction of the second switch module, the forward conduction of the diode in the third switch module corresponds to the conduction of the third switch module, and the forward conduction of the diode in the fourth switch module corresponds to the conduction of the fourth switch module.

[0044] In an optional manner, the first charge and discharge module, the second charge and discharge module, the third charge and discharge module, and the fourth charge and discharge module all include capacitors;

[0045] The two ends of the capacitor are the two ends of the corresponding charging and discharging module.

[0046] In a second aspect, the present application provides a power supply system, including a controller, a DC auxiliary power supply, an AC auxiliary power supply, and the power supply circuit as described above;

[0047] The power supply circuit is connected to the controller, the DC auxiliary power supply and the AC auxiliary power supply respectively. The power supply circuit is used to output a voltage for supplying power to the controller based on the power provided by the DC auxiliary power supply and the AC auxiliary power supply.

[0048] The present application has the following beneficial effects: The power supply circuit provided herein is used to power a controller. The power supply circuit is further configured to be connected to a DC auxiliary power supply and an AC auxiliary power supply, respectively. The DC auxiliary power supply is configured to convert a DC input power supply into a first DC power supply, and the AC auxiliary power supply is configured to convert an AC input power supply into a second DC power supply. When the power supply circuit includes a first isolation conversion module, a first switch module, and a second switch module, if the voltage of the AC input power supply is greater than or equal to a first voltage threshold, and the voltage of the third power supply is greater than or equal to the voltage of the first power supply, the first switch module is turned on. Subsequently, the third power supply output by the first isolation conversion module can be output at a first node to supply power to the controller, meaning that the actual power source of the controller is now the AC input power supply. If the voltage of the DC input power supply is greater than or equal to a second voltage threshold, and the voltage of the first power supply is greater than or equal to the voltage of the third power supply, the second switch module is turned on. Subsequently, the voltage of the first power supply can be output at a first node to supply power to the controller, meaning that the actual power source of the controller is now the DC input power supply. This enables the controller to be powered by either the AC input power supply or the DC input power supply. And in this process, the second power supply and the third power supply are isolated, so even if the second power supply is also used to power other units, it will not affect each other with the controller powered by the third power supply, and the safety requirements are met. At the same time, there is no need to add an auxiliary power supply as in the related art, which can achieve the purpose of reducing costs. When the power supply circuit includes a second isolation conversion module, a first switch module and a second switch module, based on an analysis process similar to the above process, it can be seen that even if the second power supply is used to power other units, the power supply of the controller comes from the fourth power supply, and the fourth power supply and the second power supply will not affect each other, which meets the safety requirements. In addition, there is no need to add an auxiliary power supply as in the related art, which can also achieve the purpose of reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0050] Figure 1A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0051] Figure 2 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0052] Figure 3 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0053] Figure 4 A schematic diagram of the circuit structure of a power supply circuit provided in one embodiment of the present application;

[0054] Figure 5 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0055] Figure 6 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0056] Figure 7 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0057] Figure 8 A schematic diagram of the structure of a power supply circuit provided in one embodiment of the present application;

[0058] Figure 9 A schematic diagram of the circuit structure of a power supply circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0059] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0060] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the power supply circuit provided in the embodiment of the present application. Figure 1 As shown, the power supply circuit 100 is used to supply power to the controller 200. The power supply circuit 100 is also used to connect to a DC auxiliary power supply 400 and an AC auxiliary power supply 300. The DC auxiliary power supply 400 is used to convert a DC input power supply VIN1 into a DC first power supply V1, and the AC auxiliary power supply 300 is used to convert an AC input power supply VIN2 into a DC second power supply V2.

[0061] The power supply circuit 100 includes a first switch module 102, a second switch module 104, and a first isolation conversion module 106. The first isolation conversion module 106 is connected between the AC auxiliary power supply 300 and the first switch module 102. The first switch module 102 is connected between the first isolation conversion module 106 and a first node N1. The second switch module 104 is connected between the DC auxiliary power supply 400 and the first node N1. The first node N1 is the connection point between the first switch module 102 and the second switch module 104. The controller 200 is also connected to the first node N1.

[0062] Specifically, the first isolation conversion module 106 is configured to convert the second power supply V2 into a third power supply V3 and isolate the second power supply V2 from the third power supply V3. The first switch module 102 is configured to conduct when the voltage of the AC input power supply VIN2 is greater than a first voltage threshold and the voltage of the third power supply V3 is greater than or equal to the voltage of the first power supply V1, thereby outputting a voltage based on the voltage of the third power supply V3 at a first node N1 to power the controller 200. The second switch module 104 is configured to conduct when the voltage of the DC input power supply VIN1 is greater than a second voltage threshold and the voltage of the first power supply V1 is greater than or equal to the voltage of the third power supply V3, thereby outputting a voltage based on the voltage of the first power supply V1 at a first node N1 to power the controller 200.

[0063] It should be noted that the first voltage threshold and the second voltage threshold can be set according to actual application conditions, and the embodiments of the present application do not impose specific restrictions on this. For example, in one embodiment, the first voltage threshold and the second voltage threshold are both set to 0, then the voltage of the AC input power supply VIN2 is greater than the first voltage threshold, which corresponds to the AC input power supply VIN2 being powered. At this time, the AC input power supply VIN2 can be used as a power source for the controller 200. Similarly, the voltage of the DC input power supply VIN1 is greater than the second voltage threshold, which corresponds to the DC input power supply VIN1 being powered. At this time, the DC input power supply VIN1 can be used as a power source for the controller 200. The first voltage threshold and the second voltage threshold can be the same or different.

[0064] Secondly, in the embodiments of the present application, the conversion between the two power supplies is generally achieved by stepping down or stepping up the voltage. For example, converting the second power supply V2 to the third power supply V3 means stepping up or stepping down the voltage of the second power supply V2 to obtain the third power supply V3.

[0065] Furthermore, achieving isolation between two power supplies refers to electrically isolating the two power supplies. For example, isolating the second power supply V2 from the third power supply V3 means that the second power supply V2 and the third power supply V3 are electrically isolated and independent of each other.

[0066] In actual applications, if the voltage of the AC input power source VIN2 is greater than a first voltage threshold, it can be determined that the voltage of the AC input power source VIN2 is suitable for use as a power source for the controller 200. Subsequently, the first isolation conversion module 106 converts the second power source V2 output by the AC auxiliary power source 300 into a third power source V3 capable of powering the controller 200. If the voltage of the third power source V3 is greater than or equal to the voltage of the first power source V1, the first switch module 102 is turned on and the second switch module 104 is turned off. The third power source V3 then powers the controller 200 via the first switch module 102 and the first node N1.

[0067] In the related art, the second power supply V2 is typically used directly to power the control unit (corresponding to the controller 200 in the embodiment of the present application) and other units (such as a fan for heat dissipation). This can result in failure to meet safety regulations due to the mutual influence between the different units. In the embodiment of the present application, by adding a first isolation conversion module 106, on the one hand, voltage conversion can be achieved to output a third power supply V3 capable of powering the controller 200, thereby meeting the power supply requirements; on the other hand, isolation is achieved between the second power supply V2 and the third power supply V3. Furthermore, the second power supply V2 is used to power the other units, and the third power supply V3 is used to power the controller 200. Therefore, the controller 200 and the other units will not affect each other, thus meeting safety regulations.

[0068] Secondly, in related art, to meet safety regulations, it is often necessary to add an additional AC auxiliary power supply 200 to obtain a separate power supply for the controller 200 based on the AC input power supply VIN2, which increases costs. However, in the embodiments of the present application, the additional AC auxiliary power supply 200 is not required, thereby reducing costs.

[0069] If the voltage of the DC input power supply VIN1 is greater than the second voltage threshold, it is determined that the voltage of the DC input power supply VIN1 is capable of serving as a power source for the controller 200. Furthermore, the first power supply V1 output by the DC auxiliary power supply 400 is capable of powering the controller 200. If the voltage of the first power supply V1 is greater than or equal to the voltage of the third power supply V3, the second switch module 104 is turned on and the first switch module 102 is turned off. The first power supply V1 supplies power to the controller 200 via the second switch module 104 and the first node N1.

[0070] Therefore, when the voltage of the AC input power supply VIN2 can serve as the power source for the controller 200, if the voltage of the third power supply V3 is greater than or equal to the voltage of the first power supply V1, the third power supply V3 powers the controller 200; when the voltage of the DC input power supply VIN1 can serve as the power source for the controller 200, if the voltage of the first power supply V1 is greater than or equal to the voltage of the third power supply V3, the first power supply V1 powers the controller 200.

[0071] In one embodiment, if Figure 2 As shown, the DC auxiliary power supply 400 is also used to convert the DC input power supply VIN1 into a DC fifth power supply V5. The voltage polarity of the fifth power supply V5 is opposite to that of the first power supply V1. For example, if the voltage of the first power supply V1 is positive, the voltage of the fifth power supply V5 is negative.

[0072] The power supply circuit 100 further includes a third switch module 108 and a fourth switch module 110. The third switch module 108 is connected between the first isolation conversion module 106 and the second node N2, and the fourth switch module 110 is connected between the DC auxiliary power supply 400 and the second node N2. The second node N2 is the connection point between the third switch module 108 and the fourth switch module 110.

[0073] Specifically, the first isolation conversion module 106 is further configured to convert the second power supply V2 into a sixth power supply V6 and isolate the second power supply V2 from the sixth power supply V6. The third switch module 108 is configured to conduct when the voltage of the AC input power supply VIN2 is greater than or equal to a first voltage threshold and the voltage of the sixth power supply V6 is less than or equal to the voltage of the fifth power supply V5, thereby outputting a voltage for powering the controller 200 at the second node N2 based on the voltage of the sixth power supply V6. Furthermore, the voltage polarity of the sixth power supply V6 is opposite to that of the second power supply V2. The fourth switch module 110 is configured to conduct when the voltage of the DC input power supply VIN1 is greater than or equal to a second voltage threshold and the voltage of the fifth power supply V5 is less than or equal to the voltage of the sixth power supply V6, thereby outputting a voltage for powering the controller 200 at the second node N2 based on the voltage of the fifth power supply V5.

[0074] In actual applications, the voltage of the AC input power source VIN2 is determined to be greater than a first voltage threshold to be sufficient to power the controller 200. Subsequently, the first isolation conversion module 106 converts the second power source V2 output by the AC auxiliary power source 300 into a sixth power source V6 capable of powering the controller 200. If the voltage of the sixth power source V6 is less than or equal to the voltage of the fifth power source V2, the third switch module 108 is turned on and the fourth switch module 110 is turned off. The sixth power source V6 then powers the controller 200 via the third switch module 108 and the second node N2.

[0075] The voltage of the DC input power supply VIN1 being greater than the second voltage threshold determines that the voltage of the DC input power supply VIN1 is capable of serving as a power source for the controller 200. Furthermore, the fifth power supply V5 output by the DC auxiliary power supply 400 is capable of powering the controller 200. If the voltage of the fifth power supply V5 is less than or equal to the voltage of the sixth power supply V6, the fourth switch module 110 is turned on and the third switch module 108 is turned off. The fifth power supply V5 supplies power to the controller 200 via the fourth switch module 110 and the second node N2.

[0076] Therefore, when the voltage of the AC input power supply VIN2 can serve as the power supply source for the controller 200, if the voltage of the sixth power supply V6 is less than or equal to the voltage of the fifth power supply V2, the sixth power supply V6 supplies power to the controller 200; when the voltage of the DC input power supply VIN1 can serve as the power supply source for the controller 200, if the voltage of the fifth power supply V5 is less than or equal to the voltage of the sixth power supply V6, the fifth power supply V5 supplies power to the controller 200.

[0077] In summary, through the above method, it is achieved that the controller 200 is powered by one of the first power supply V1 and the third power supply V3, and the controller 200 is powered by one of the fifth power supply V5 and the sixth power supply V6. In addition, the polarity of the first power supply V1 and the third power supply V3 is the same, the polarity of the fifth power supply V5 and the sixth power supply V6 is the same, and the polarity of the first power supply V1 and the fifth power supply V5 is different. For example, the voltages of the first power supply V1 and the third power supply V3 are both positive voltages; then the voltages of the fifth power supply V5 and the sixth power supply V6 are both negative voltages. Subsequently, it is possible to simultaneously provide the controller 200 with positive and negative voltage power supplies to meet the power supply requirements of different controllers 200, which is conducive to improving practicality.

[0078] In one embodiment, if Figure 3 As shown, the power supply circuit 100 further includes a first charge and discharge module 112 , a second charge and discharge module 114 , a third charge and discharge module 116 and a fourth charge and discharge module 118 .

[0079] The first charge-discharge module 112 is connected between a first node N1 and ground GND, the second charge-discharge module 114 is connected between a second node N2 and ground GND, the third charge-discharge module 116 is connected between a third node N3 between the first switch module 102 and the first isolation conversion module 106 and ground GND, and the fourth charge-discharge module 118 is connected between a fourth node N4 between the third switch module 108 and the first isolation conversion module 106 and ground GND.

[0080] Specifically, the first charge and discharge module 112, the second charge and discharge module 114, the third charge and discharge module 116, and the fourth charge and discharge module 118 are all used to filter and maintain the stability of the corresponding power supply. Among them, the first charge and discharge module 112 is used to filter the power supply of the first node N1 and maintain its stability; the second charge and discharge module 114 is used to filter the power supply of the second node N2 and maintain its stability; the third charge and discharge module 116 is used to filter the power supply of the third node N3 and maintain its stability; and the fourth charge and discharge module 118 is used to filter the power supply of the fourth node N4 and maintain its stability. By providing the first charge and discharge module 112, the second charge and discharge module 114, the third charge and discharge module 116, and the fourth charge and discharge module 118, each power supply can have a higher stability, which is conducive to improving the reliability of the power supply circuit 100.

[0081] Please refer to Figure 4 , Figure 4 A circuit structure of the power supply circuit 100 is exemplarily shown.

[0082] In one embodiment, if Figure 4 As shown, the first switch module 102, the second switch module 104, the third switch module 108, and the fourth switch module 110 all include diodes. Specifically, the first switch module 102 includes a third diode D3, the second switch module 104 includes a fourth diode D4, the third switch module 108 includes a fifth diode D4, and the fourth switch module 110 includes a sixth diode D6.

[0083] The forward conduction of the diode in the first switch module 102 corresponds to the conduction of the first switch module 102, that is, the forward conduction of the third diode D3 corresponds to the conduction of the first switch module 102. The forward conduction of the diode in the second switch module 104 corresponds to the conduction of the second switch module 104, that is, the forward conduction of the fourth diode D4 corresponds to the conduction of the second switch module 104. The forward conduction of the diode in the third switch module 108 corresponds to the conduction of the third switch module 108, that is, the forward conduction of the fifth diode D5 corresponds to the forward conduction of the third switch module 108. The forward conduction of the diode in the fourth switch module 110 corresponds to the conduction of the fourth switch module 110, that is, the forward conduction of the sixth diode D6 corresponds to the conduction of the fourth switch module 110.

[0084] In one embodiment, the first charge-discharge module 112, the second charge-discharge module 114, the third charge-discharge module 116, and the fourth charge-discharge module 118 all include capacitors. Specifically, the first charge-discharge module 112 includes a first capacitor C1, the second charge-discharge module 114 includes a second capacitor C2, the third charge-discharge module 116 includes a third capacitor C3, and the fourth charge-discharge module 118 includes a fourth capacitor C4.

[0085] Specifically, the two ends of each capacitor correspond to the two ends of the corresponding charge-discharge module. That is, the two ends of the first capacitor C1 correspond to the two ends of the first charge-discharge module 112; the two ends of the second capacitor C2 correspond to the two ends of the second charge-discharge module 114; the two ends of the third capacitor C3 correspond to the two ends of the third charge-discharge module 116; and the two ends of the fourth capacitor C4 correspond to the two ends of the fourth charge-discharge module 118.

[0086] In this embodiment, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4 are provided to filter the power supplies of the first node N1, the second node N2, the third node N3, and the fourth node N4, respectively, and the voltages of these power supplies remain relatively stable, thereby improving the stability of the operation of the power supply circuit.

[0087] It is understood that in this embodiment, each charging and discharging module includes a capacitor, but in other embodiments, each charging and discharging module may also include multiple capacitors to achieve different functions. For example, the first capacitor C1 may be composed of a ceramic capacitor and an electrolytic capacitor connected in series.

[0088] In one embodiment, the first isolation conversion module 106 includes a transformer T1 , and the transformer T1 includes a primary winding L1 , a first secondary winding L2 , and a second secondary winding L3 .

[0089] In which, the first end of the primary winding L1 is connected to the first output end of the AC auxiliary power supply 300, the second end of the primary winding L1 is connected to the second output end of the AC auxiliary power supply 300, the first end of the first secondary winding L2 is connected to the first node N1 through the first switch module 102, the second end of the first secondary winding L2 and the first end of the second secondary winding L3 are both grounded GND, and the second end of the second secondary winding L3 is connected to the second node N2 through the third switch module 108.

[0090] In this embodiment, by setting the turns ratio of the primary winding L1 to the first secondary winding L2, the second power source V2 can be converted into a third power source V3. By setting the turns ratio of the primary winding L1 to the second secondary winding L3, the second power source V2 can be converted into a sixth power source V6. Furthermore, the transformer T1 provides isolation, isolating the second power source V2 from the third power source V3 and from the sixth power source V6. Therefore, even if the second power source V2 is used to power units outside the controller 200, these units and the controller 200 will not interfere with each other, thus meeting safety regulations.

[0091] Figure 4 The figure also shows an example of a structure of an AC auxiliary power supply 300 and a DC auxiliary power supply 400. Figure 4As shown, the AC auxiliary power supply 300 includes a transformer T3, a ninth diode D9, a sixth inductor L6, a ninth capacitor C9, and a tenth capacitor C10. The DC auxiliary power supply 400 includes a transformer T2, a seventh diode D7, an eighth diode D8, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fourth inductor L4, and a fifth inductor L5.

[0092] In particular, the primary winding of the transformer T3 is connected to the AC input power source VIN2, the first end of the secondary winding of the transformer T3 is connected to the anode of the ninth diode D9, the second end of the secondary winding of the transformer T3 is respectively connected to the first end of the tenth capacitor C10, the first end of the ninth capacitor C9, and the second end of the second secondary winding L1 of the transformer T1, the cathode of the ninth diode D9 is respectively connected to the first end of the sixth inductor L6 and the second end of the tenth capacitor C10, and the second end of the sixth inductor L6 is respectively connected to the second end of the ninth capacitor C9 and the first end of the second secondary winding L1 of the transformer T1.

[0093] The primary winding of the transformer T2 is connected to the DC input power supply VIN1. The first end of the first secondary winding of the transformer T2 is connected to the anode of the seventh diode D7. The cathode of the seventh diode D7 is connected to the first end of the fifth capacitor C5 and the first end of the fourth inductor L4, respectively. The second end of the fourth inductor L4 is connected to the first end of the sixth capacitor C6 and the anode of the fourth diode D4, respectively. The second end of the first secondary winding of the transformer T2, the second end of the fifth capacitor C5, and the second end of the sixth capacitor C6 are all connected to ground GND. The first end of the second secondary winding of the transformer T2 is connected to the anode of the eighth diode D8. The cathode of the eighth diode D8 is connected to the first end of the seventh capacitor C7 and the first end of the fifth inductor L5, respectively. The second end of the fifth inductor L5 is connected to the first end of the eighth capacitor C8 and the cathode of the sixth diode D6, respectively. The second end of the second secondary winding of the transformer T2, the second end of the seventh capacitor C7, and the second end of the eighth capacitor C8 are all connected to ground GND.

[0094] Specifically, transformer T2 and transformer T3 are both used for voltage conversion and isolation. The seventh diode D7, the eighth diode D8, and the ninth diode D9 are used for rectification. The ninth capacitor C9, the tenth capacitor C10, and the sixth inductor L6 form a π-type filter. The fifth capacitor C5, the sixth capacitor C6, and the fourth inductor L4 form a π-type filter. The seventh capacitor C7, the eighth capacitor C8, and the fifth inductor L5 form a π-type filter.

[0095] The following Figure 4 The principle of the power supply circuit 100 is described again by taking the circuit structure shown as an example.

[0096] By adjusting the turns ratio between the primary winding L1 and the first secondary winding L2, the second power source V2 can be converted into the third power source V3. The power source at the third node N3 is the third power source V3. The first power source V1 output by the DC auxiliary power supply 400 acts on the anode of the fourth diode D4. Therefore, the conduction and disconnection of the third diode D3 and the fourth diode D4 depend on the voltage relationship between the first power source V1 and the third power source V3.

[0097] When the voltage of the AC input power supply VIN2 is greater than a first voltage threshold and the DC input power supply VIN1 is less than or equal to a second voltage threshold, the voltage of the AC input power supply VIN2 can be determined to be the power source for the controller 200, or the AC input power supply VIN2 is present. In this case, the voltage of the third power supply V3 is necessarily greater than the voltage of the first power supply V1. The third diode D3 is conductive, and the fourth diode D4 is reversely blocked. The voltage at the first node N1 is provided by the third power supply V3.

[0098] When the voltage of the AC input power source VIN2 is less than or equal to the first voltage threshold, and the DC input power source VIN1 is greater than the second voltage threshold, the voltage of the DC input power source VIN1 can be determined to be the power source for the controller 200, or it can be determined that the DC input power source VIN1 is powered. In this case, the voltage of the first power source V1 is necessarily greater than the voltage of the third power source V3. The fourth diode D4 is conductive, and the third diode D3 is reversely blocked. The voltage at the first node N1 is provided by the first power source V1.

[0099] When the voltage of the AC input power supply VIN2 is greater than a first voltage threshold, and the DC input power supply VIN1 is greater than a second voltage threshold, either the AC input power supply VIN2 or the DC input power supply VIN1 can be determined as the power source for the controller 200. Alternatively, both the AC input power supply VIN2 and the DC input power supply VIN1 can be powered. In this case, if the voltage of the first power supply V1 is greater than the voltage of the third power supply V3, the fourth diode D4 is turned on, and the third diode D3 is reversely blocked. The voltage at the first node N1 is provided by the first power supply V1. If the voltage of the third power supply V3 is greater than the voltage of the first power supply V1, the third diode D3 is turned on, and the fourth diode D4 is reversely blocked. The voltage at the first node N1 is provided by the third power supply V1.

[0100] By analyzing the voltage of the second node N2 in a similar manner as described above, it is also possible to determine who provides the voltage of the second node N2 .

[0101] In this way, the controller 200 is powered. In this embodiment, the transformer T1 is provided to isolate the second power supply V2 from the third power supply V3 and the second power supply V2 from the sixth power supply V6 to meet safety requirements.

[0102] Please refer to Figure 5 , Figure 5 Another structure of the power supply circuit 100 provided in the embodiment of the present application. Figure 5 As shown, the power supply circuit 100 includes a first switch module 102, a second switch module 104 and a second isolation conversion module 120. The second isolation conversion module 120 is connected between the AC auxiliary power supply 300 and the first switch module 102, the first switch module 102 is connected between the second isolation conversion module 120 and the first node N1, and the second switch module 104 is connected between the DC auxiliary power supply 400 and the first node N1. Figure 5 The structure shown is Figure 1 The difference in the structure shown is that the first isolation conversion module 106 is replaced by a second isolation conversion module 120 , while the other modules are the same.

[0103] Specifically, the second isolation conversion module 102 is configured to convert the AC input power supply VIN2 into a DC fourth power supply V4 that is isolated from the AC input power supply VIN2. The first switch module 102 is configured to conduct when the voltage of the AC input power supply VIN2 is greater than a first voltage threshold and the voltage of the fourth power supply V4 is greater than or equal to the voltage of the first power supply V1, thereby outputting a voltage for powering the controller 200 at a first node N1 based on the voltage of the fourth power supply V4. The second switch module 104 is configured to conduct when the voltage of the DC input power supply VIN1 is greater than a second voltage threshold and the voltage of the first power supply V1 is greater than or equal to the voltage of the fourth power supply V4, thereby outputting a voltage for powering the controller 200 at a first node N1 based on the voltage of the first power supply V1.

[0104] In actual applications, if the voltage of the AC input power source VIN2 is greater than the first voltage threshold, it can be determined that the voltage of the AC input power source VIN2 is suitable for use as a power source for the controller 200. Subsequently, the second isolation conversion module 102 and the AC auxiliary power supply 300 are combined to convert the AC input power source VIN2 into a fourth power source V4 capable of powering the controller 200. If the voltage of the fourth power source V4 is greater than or equal to the voltage of the first power source V1, the first switch module 102 is turned on and the second switch module 104 is turned off. The fourth power source V4 supplies power to the controller 200 via the first switch module 102 and the first node N1.

[0105] Similarly, in this embodiment, by adding a second isolation conversion module 102, on the one hand, voltage conversion can be achieved to output a fourth power supply V4 that can power the controller 200, thereby meeting the power supply requirements; on the other hand, the fourth power supply V4 that powers the controller 200 and the second power supply V2 output by the AC auxiliary power supply 300 are electrically independent of each other, and the second power supply V2 is used to power other units, and the fourth power supply V4 is used to power the controller 200. The controller 200 and other units will not affect each other, and safety requirements can be met.

[0106] Secondly, in this embodiment, no additional AC auxiliary power supply 200 is added, thereby reducing costs.

[0107] If the voltage of the DC input power supply VIN1 is greater than the second voltage threshold, it is determined that the voltage of the DC input power supply VIN1 is sufficient to power the controller 200. Furthermore, the first power supply V1 output by the DC auxiliary power supply 400 is sufficient to power the controller 200. If the voltage of the first power supply V1 is greater than the voltage of the fourth power supply V4, the second switch module 104 is turned on and the first switch module 102 is turned off. The first power supply V1 supplies power to the controller 200 via the second switch module 104 and the first node N1.

[0108] Therefore, when the voltage of the AC input power supply VIN2 can serve as the power supply source for the controller 200, if the voltage of the fourth power supply V4 is greater than or equal to the voltage of the first power supply V1, the fourth power supply V4 supplies power to the controller 200; when the voltage of the DC input power supply VIN1 can serve as the power supply source for the controller 200, if the voltage of the first power supply V1 is greater than or equal to the voltage of the fourth power supply V4, the first power supply V1 supplies power to the controller 200.

[0109] In one embodiment, referring to Figure 2 exist Figure 1 Adding a third switch module 108 and a fourth switch module 110 to the structure of Figure 5 The structure shown in FIG. 1 is further increased by a third switch module 108 and a fourth switch module 110. Figure 6 shown.

[0110] like Figure 6 As shown, the third switch module 108 is connected between the second isolation conversion module 120 and the second node N2 , and the fourth switch module 110 is connected between the DC auxiliary power supply VIN1 and the second node N2 .

[0111] Specifically, the second isolation conversion module 120 is further configured to convert the AC input power supply VIN2 into a DC seventh power supply V7 that is isolated from the AC input power supply VIN2. The third switch module 108 is configured to conduct when the voltage of the AC input power supply VIN2 is greater than a first voltage threshold and the voltage of the seventh power supply V7 is less than or equal to the voltage of the fifth power supply V5, thereby outputting a voltage for powering the controller 200 at a second node N2 based on the voltage of the seventh power supply V7. The fourth switch module 110 is configured to conduct when the voltage of the DC input power supply 400 is greater than a second voltage threshold and the voltage of the fifth power supply V5 is less than or equal to the voltage of the seventh power supply V7, thereby outputting a voltage for powering the controller 200 at a first node N1 based on the voltage of the fifth power supply V5.

[0112] In actual applications, the voltage of the AC input power source VIN2 is determined to be greater than a first voltage threshold to be sufficient to power the controller 200. Subsequently, the second isolation conversion module 120 and the AC auxiliary power supply 300 are combined to convert the AC input power source VIN2 into a seventh power source V7 capable of powering the controller 200. If the voltage of the seventh power source V7 is less than or equal to the voltage of the fifth power source V2, the third switch module 108 is turned on and the fourth switch module 110 is turned off. The seventh power source V7 then powers the controller 200 via the third switch module 108 and the second node N2.

[0113] The voltage of the DC input power supply VIN1 is greater than the second voltage threshold, confirming that the voltage of the DC input power supply VIN1 is capable of serving as a power source for the controller 200. Furthermore, the fifth power supply V5 output by the DC auxiliary power supply 400 is capable of powering the controller 200. If the voltage of the fifth power supply V5 is less than or equal to the voltage of the seventh power supply V7, the fourth switch module 110 is turned on and the third switch module 108 is turned off. The fifth power supply V5 supplies power to the controller 200 via the fourth switch module 110 and the second node N2.

[0114] Therefore, when the voltage of the AC input power supply VIN2 can serve as the power supply source for the controller 200, if the voltage of the seventh power supply V7 is less than or equal to the voltage of the fifth power supply V2, the seventh power supply V7 supplies power to the controller 200; when the voltage of the DC input power supply VIN1 can serve as the power supply source for the controller 200, if the voltage of the fifth power supply V5 is less than or equal to the voltage of the seventh power supply V7, the fifth power supply V5 supplies power to the controller 200.

[0115] Through the above method, the controller 200 is powered by one of the first power supply V1 and the fourth power supply V4, and is powered by one of the fifth power supply V5 and the seventh power supply V7. In addition, the first power supply V1 and the fourth power supply V4 have the same polarity, the fifth power supply V5 and the seventh power supply V7 have the same polarity, and the first power supply V1 and the fifth power supply V5 have different polarities. For example, the voltages of the first power supply V1 and the fourth power supply V4 are both positive; then the voltages of the fifth power supply V5 and the seventh power supply V7 are both negative. Consequently, the controller 200 can be provided with both positive and negative voltage power supplies to meet the power supply requirements of different controllers 200, which is conducive to improving practicality.

[0116] In one embodiment, referring to Figure 3 exist Figure 2 The first charging and discharging module 112, the second charging and discharging module 114, the third charging and discharging module 116 and the fourth charging and discharging module 118 can also be added to the structure of Figure 5 The structure shown in FIG1 is increased by the first charge and discharge module 112, the second charge and discharge module 114, the third charge and discharge module 116 and the fourth charge and discharge module 118. Figure 7 shown.

[0117] The first charge-discharge module 112 is connected between a first node N1 and ground GND, the second charge-discharge module 114 is connected between a second node N2 and ground GND, the third charge-discharge module 116 is connected between a fifth node N5 between the first switch module 102 and the second isolation conversion module 120 and ground GND, and the fourth charge-discharge module 118 is connected between a sixth node N6 between the third switch module 108 and the second isolation conversion module 120 and ground GND. The first charge-discharge module 112, the second charge-discharge module 114, the third charge-discharge module 116, and the fourth charge-discharge module 118 have been described in the above embodiments and will not be repeated here.

[0118] In one embodiment, if Figure 8 As shown, the power supply circuit 100 further includes a first voltage conversion module 122 , wherein the first voltage conversion module 122 is connected between the second isolation conversion module 120 and the first switch module 102 .

[0119] Specifically, the first voltage conversion module 122 is configured to convert the fourth power source V4 into a stable eighth power source V8. The first switch module 102 is further configured to conduct when the voltage of the AC input power source VIN2 is greater than a first voltage threshold and the voltage of the eighth power source V8 is greater than or equal to the voltage of the first power source V1, thereby outputting a voltage for powering the controller 200 at a first node N1 based on the voltage of the eighth power source V8. The second switch module 104 is further configured to conduct when the voltage of the DC input power source VIN1 is greater than a second voltage threshold and the voltage of the first power source V1 is greater than or equal to the voltage of the eighth power source V8, thereby outputting a voltage for powering the controller 200 at a first node N1 based on the voltage of the first power source V1.

[0120] In actual applications, when the voltage of the fourth power supply V4 output by the second isolation conversion module 12 is greater than the power supply voltage required by the controller 200, the first voltage conversion module 122 can be used to further convert the fourth power supply V4 to output a voltage capable of powering the controller 200. At the same time, if the voltage of the fourth power supply V4 is unstable, the first voltage conversion module 122 can be used to stabilize the voltage to output a stable eighth power supply V8 to power the controller 200, thereby maintaining stable and normal operation of the controller 200.

[0121] In one embodiment, the first voltage conversion module 122 can be implemented using a step-down circuit, such as a BUCK circuit; it can also be implemented using a step-up circuit, such as a BOOST circuit; or it can also use other types of voltage conversion circuits, such as a low dropout regulator (LDO).

[0122] It should be noted that, in any embodiment of the present application, a voltage conversion module can be added in the same manner to obtain the required voltage. Figure 3 In the structure shown, when the third power supply V3 cannot directly power the controller 200 , a voltage conversion module can also be set between the first switch module 102 and the first isolation conversion module 106 to output a voltage that meets the power supply requirement of the controller 200 .

[0123] Please refer to Figure 9 , Figure 9 The example shows Figure 7 A circuit corresponding to the structure shown. Among them, the first switch module 102, the second switch module 104, the third switch module 106, the fourth switch module 108, the first charge and discharge module 112, the second charge and discharge module 114, the third charge and discharge module 116, the fourth charge and discharge module 118, the DC auxiliary power supply 400 and the AC auxiliary power supply 300 can refer to the Figure 4 The description is not repeated here.

[0124] In one embodiment, if Figure 9 As shown, the second isolation conversion module 120 includes a third secondary winding L7 , a fourth secondary winding L8 , a first diode D1 , and a second diode D2 .

[0125] The first end of the third secondary winding L7 is connected to the anode of the first diode D1, the second end of the third secondary winding L7 and the first end of the fourth secondary winding L8 are both grounded GND, and the second end of the fourth secondary winding L8 is connected to the cathode of the second diode D2. The cathode of the first diode D1 is connected to the first node N1 via the first switch module 102, and the anode of the second diode D2 is connected to the second node N2 via the third switch module 108. The third secondary winding L7 and the fourth secondary winding L8 are both coupled to the same magnetic core as the primary winding of the AC auxiliary power supply 300.

[0126] Specifically, because the third secondary winding L7 and the fourth secondary winding L8 are coupled to the same magnetic core as the primary winding of the AC auxiliary power supply 300, the combination of the third secondary winding L7, the fourth secondary winding L8, and the primary winding of the AC auxiliary power supply 300 can function as a transformer. The primary winding of this transformer is the primary winding of the AC auxiliary power supply 300, and the transformer includes two secondary windings: the third secondary winding L7 and the fourth secondary winding L8. By adjusting the turns ratio between the primary winding and the third secondary winding L7 of the AC auxiliary power supply 300, the AC input power VIN2 can be converted into the fourth power supply V4. By adjusting the turns ratio between the primary winding and the fourth secondary winding L8 of the AC auxiliary power supply 300, the AC input power VIN2 can be converted into the seventh power supply V7. The power output by the secondary winding in the AC auxiliary power supply 300 (the second power supply V2 in the above embodiment) can be used to power units other than the controller 200, so that these units and the controller 200 will not affect each other, meeting safety requirements.

[0127] In another embodiment, the second isolation conversion module 120 further includes a first filter inductor L9 , a second filter inductor L10 , a first filter capacitor C11 , a second filter capacitor C12 , a third filter capacitor C13 , and a fourth filter capacitor C14 .

[0128] In which, the first end of the first filter inductor L9 is connected to the first end of the first filter capacitor C11, and the first end of the first filter inductor L9 is also connected to the first switch module 102 at the fifth node N5. The second end of the first filter inductor L9 is respectively connected to the cathode of the first diode D1 and the first end of the second filter capacitor C12. The second end of the first filter capacitor C11, the second end of the second filter capacitor C12, the second end of the third filter capacitor C13, and the second end of the fourth filter capacitor C14 are all grounded GND. The first end of the third filter capacitor C13 is connected to the first end of the second filter inductor L10, and the first end of the third filter capacitor C13 is also connected to the third switch module 108 at the sixth node N6. The second end of the second filter inductor L10 is respectively connected to the first end of the fourth filter capacitor C14 and the anode of the second diode D2.

[0129] In this embodiment, the first filter inductor L9, the first filter capacitor C11 and the second filter capacitor C12 form a π-type filter. The second filter inductor L10, the third filter capacitor C13 and the fourth filter capacitor C14 form a π-type filter.

[0130] The present application also provides a power supply system, which includes a controller, a DC auxiliary power supply, an AC auxiliary power supply, and the power supply circuit 100 in any embodiment of the present application.

[0131] The power supply circuit 100 is connected to the controller, the DC auxiliary power supply and the AC auxiliary power supply respectively. The power supply circuit 100 is used to output a voltage for supplying power to the controller based on the power provided by the DC auxiliary power supply and the AC auxiliary power supply.

[0132] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply circuit, characterized in that: The power supply circuit is used to supply power to the controller. The power supply circuit is also used to connect to a DC auxiliary power supply and an AC auxiliary power supply respectively. The DC auxiliary power supply is used to convert a DC input power supply into a first DC power supply, and the AC auxiliary power supply is used to convert an AC input power supply into a second DC power supply. The power supply circuit includes: a second isolation conversion module, a first switch module, and a second switch module; The second isolation conversion module is connected between the AC auxiliary power supply and the first switch module, and is used to convert the AC input power supply into a fourth DC power supply isolated from the AC input power supply; The first switch module is connected between the second isolation conversion module and the first node, and is configured to be turned on when the voltage of the AC input power supply is greater than a first voltage threshold and the voltage of the fourth power supply is greater than or equal to the voltage of the first power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the fourth power supply; The second switch module is connected between the DC auxiliary power supply and the first node, and is configured to be turned on when the voltage of the DC input power supply is greater than a second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the fourth power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply; The DC auxiliary power supply is further used to convert the DC input power supply into a fifth DC power supply, wherein the voltage polarity of the fifth power supply is opposite to that of the first power supply; The power supply circuit further includes: a third switch module and a fourth switch module; The second isolation conversion module is further configured to convert the AC input power into a seventh DC power supply isolated from the AC input power supply; The third switch module is connected between the second isolation conversion module and the second node, and is configured to be turned on when the voltage of the AC input power supply is greater than a first voltage threshold and the voltage of the seventh power supply is less than or equal to the voltage of the fifth power supply, so as to output a voltage for powering the controller at the second node based on the voltage of the seventh power supply; The fourth switch module is connected between the DC auxiliary power supply and the second node, and is configured to be turned on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the fifth power supply is less than or equal to the voltage of the seventh power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the fifth power supply; The power supply circuit further includes a first voltage conversion module; The first voltage conversion module is connected between the second isolation conversion module and the first switch module, and the first voltage conversion module is used to convert the fourth power supply into a stable eighth power supply; The first switch module is further configured to be turned on when the voltage of the AC input power source is greater than the first voltage threshold and the voltage of the eighth power source is greater than or equal to the voltage of the first power source, so as to output a voltage for powering the controller at the first node based on the voltage of the eighth power source; The second switch module is also used to turn on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the eighth power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply.

2. The power supply circuit according to claim 1, wherein: The power supply circuit further includes a first charge and discharge module, a second charge and discharge module, a third charge and discharge module and a fourth charge and discharge module; The first charge and discharge module is connected between the first node and the ground, and the second charge and discharge module is connected between the second node and the ground; The third charge and discharge module is connected between the fifth node between the first switch module and the second isolation conversion module and the ground, and the fourth charge and discharge module is connected between the sixth node between the third switch module and the second isolation conversion module and the ground; The first charge and discharge module, the second charge and discharge module, the third charge and discharge module, and the fourth charge and discharge module are all used for filtering and maintaining the stability of corresponding power supplies.

3. The power supply circuit according to claim 1, wherein: The second isolation conversion module includes a third secondary winding, a fourth secondary winding, a first diode and a second diode; A first end of the third secondary winding is connected to the anode of the first diode, a second end of the third secondary winding and a first end of the fourth secondary winding are both grounded, a second end of the fourth secondary winding is connected to the cathode of the second diode, the cathode of the first diode is connected to the first node via the first switch module, and the anode of the second diode is connected to the second node via the third switch module; The third secondary winding and the fourth secondary winding are both coupled to the same magnetic core as the primary winding in the AC auxiliary power supply 300 .

4. The power supply circuit according to claim 3, characterized in that: The second isolation conversion module further includes a first filter inductor, a second filter inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor; The first end of the first filter inductor is respectively connected to the first switch module and the first end of the first filter capacitor, the second end of the first filter inductor is respectively connected to the cathode of the first diode and the first end of the second filter capacitor, the second end of the first filter capacitor, the second end of the second filter capacitor, the second end of the third filter capacitor and the second end of the fourth filter capacitor are all grounded, the first end of the third filter capacitor is respectively connected to the first end of the second filter inductor and the third switch module, and the second end of the second filter inductor is respectively connected to the first end of the fourth filter capacitor and the anode of the second diode.

5. The power supply circuit according to claim 1, wherein: The first switch module, the second switch module, the third switch module and the fourth switch module all include diodes; The forward conduction of the diode in the first switch module corresponds to the conduction of the first switch module, the forward conduction of the diode in the second switch module corresponds to the conduction of the second switch module, the forward conduction of the diode in the third switch module corresponds to the conduction of the third switch module, and the forward conduction of the diode in the fourth switch module corresponds to the conduction of the fourth switch module.

6. The power supply circuit according to claim 2, characterized in that: The first charge and discharge module, the second charge and discharge module, the third charge and discharge module and the fourth charge and discharge module all include capacitors; The two ends of the capacitor are the two ends of the corresponding charging and discharging module.

7. A power supply circuit, characterized in that: The power supply circuit is used to supply power to the controller. The power supply circuit is also used to connect to a DC auxiliary power supply and an AC auxiliary power supply respectively. The DC auxiliary power supply is used to convert a DC input power supply into a first DC power supply, and the AC auxiliary power supply is used to convert an AC input power supply into a second DC power supply. The power supply circuit includes: a first isolation conversion module, a first switch module, and a second switch module; The first isolation conversion module is connected between the AC auxiliary power supply and the first switch module, and is used to convert the second power supply into a third power supply and isolate the second power supply from the third power supply; The first switch module is connected between the first isolation conversion module and a first node. The first switch module is configured to be turned on when the voltage of the AC input power source is greater than a first voltage threshold and the voltage of the third power source is greater than or equal to the voltage of the first power source, so as to output a voltage for powering the controller at the first node based on the voltage of the third power source. The first node is a connection point between the first switch module and the second switch module. The second switch module is connected between the DC auxiliary power supply and the first node, and is configured to be turned on when the voltage of the DC input power supply is greater than a second voltage threshold and the voltage of the first power supply is greater than or equal to the voltage of the third power supply, so as to output a voltage for powering the controller at the first node based on the voltage of the first power supply; The DC auxiliary power supply is further used to convert the DC input power supply into a fifth DC power supply, wherein the voltage polarity of the fifth power supply is opposite to that of the first power supply; The power supply circuit further includes: a third switch module and a fourth switch module; The first isolation conversion module is further configured to convert the second power supply into a sixth power supply and isolate the second power supply from the sixth power supply; The third switch module is connected between the first isolation conversion module and a second node. The third switch module is configured to be turned on when the voltage of the AC input power source is greater than the first voltage threshold and the voltage of the sixth power source is less than or equal to the voltage of the fifth power source, so as to output a voltage for powering the controller at the second node based on the voltage of the sixth power source. The second node is a connection point between the third switch module and the fourth switch module, and the voltage polarity of the sixth power source is opposite to that of the second power source. The fourth switch module is connected between the DC auxiliary power supply and the second node, and is configured to be turned on when the voltage of the DC input power supply is greater than the second voltage threshold and the voltage of the fifth power supply is less than or equal to the voltage of the sixth power supply, so as to output a voltage for powering the controller at the second node based on the voltage of the fifth power supply; The power supply circuit further includes a first charge and discharge module, a second charge and discharge module, a third charge and discharge module and a fourth charge and discharge module; The first charge and discharge module is connected between the first node and the ground, and the second charge and discharge module is connected between the second node and the ground; The third charge and discharge module is connected between the third node between the first switch module and the first isolation conversion module and the ground, and the fourth charge and discharge module is connected between the fourth node between the third switch module and the first isolation conversion module and the ground; The first charge and discharge module, the second charge and discharge module, the third charge and discharge module, and the fourth charge and discharge module are all used for filtering and maintaining the stability of the corresponding power supply; The first isolation conversion module includes a transformer, and the transformer includes a primary winding, a first secondary winding, and a second secondary winding; The first end of the primary winding is connected to the first output end of the AC auxiliary power supply, the second end of the primary winding is connected to the second output end of the AC auxiliary power supply, the first end of the first secondary winding is connected to the first node through the first switch module, the second end of the first secondary winding and the first end of the second secondary winding are both grounded, and the second end of the second secondary winding is connected to the second node through the third switch module.

8. The power supply circuit according to claim 7, characterized in that: The first switch module, the second switch module, the third switch module and the fourth switch module all include diodes; The forward conduction of the diode in the first switch module corresponds to the conduction of the first switch module, the forward conduction of the diode in the second switch module corresponds to the conduction of the second switch module, the forward conduction of the diode in the third switch module corresponds to the conduction of the third switch module, and the forward conduction of the diode in the fourth switch module corresponds to the conduction of the fourth switch module.

9. The power supply circuit according to claim 7, characterized in that: The first charge and discharge module, the second charge and discharge module, the third charge and discharge module and the fourth charge and discharge module all include capacitors; The two ends of the capacitor are the two ends of the corresponding charging and discharging module.

10. A power supply system, characterized in that: comprising a controller, a DC auxiliary power supply, an AC auxiliary power supply and a power supply circuit according to any one of claims 1 to 9; The power supply circuit is connected to the controller, the DC auxiliary power supply and the AC auxiliary power supply respectively. The power supply circuit is used to output a voltage for supplying power to the controller based on the power provided by the DC auxiliary power supply and the AC auxiliary power supply.

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