Power supply circuit and satellite power supply system

Abstract

The embodiment of the utility model discloses a power supply circuit and a satellite power supply system, a control module is arranged to control one power supply module to work according to a detection voltage detected by a voltage detection module, that is, the power supply module of the power supply circuit works in a cold backup mode, and only one power supply module works at the same time. The power supply module which does not work is not affected by space particle radiation, so that even if one power supply module is damaged due to the space particle radiation influence, other power supply modules can continuously supply power to the load, and the power supply reliability of the power supply circuit is improved. The isolation module is connected between the output end of the power supply module and the load, the isolation module can isolate mutual influence between different power supply modules, and the power supply reliability of the power supply circuit is further improved. Moreover, the power supply circuit is simple in structure and easy for engineering realization, and has a wide application prospect in the field of microsatellites.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply technical field especially relates to a power supply circuit and satellite power system. BACKGROUND

[0002] The aerospace field has higher reliability requirements for power supply.

[0003] In the prior art, the power supply is usually supplied by using the power supply mode of main backup power hot backup, that is, the main power supply and the backup power supply work at the same time.

[0004] However, the main power supply and the backup power supply work at the same time, which makes the main power supply and the backup power supply more susceptible to space particle radiation, causing the main power supply and the backup power supply to be abnormal, affecting the power supply capacity and reducing the power supply reliability. SUMMARY

[0005] The utility model provides a kind of power supply circuit and satellite power system to reduce the influence of space particle radiation on power module, improve power supply reliability.

[0006] According to an aspect of the utility model, a power supply circuit is provided, comprising: at least two power modules, at least two voltage detection modules, at least two isolation modules and a control module;

[0007] The voltage detection modules are electrically connected to the output terminals of the corresponding power modules and the control module, and are configured to output corresponding detection voltages to the control module according to the output voltages of the power modules;

[0008] The control module is configured to control one of the power modules to work according to the detection voltages;

[0009] The isolation modules are connected between the output terminals of the corresponding power modules and the loads.

[0010] Optionally, the control module includes a control unit and a switching unit;

[0011] The control unit is electrically connected to the voltage detection modules and the control terminals of the switching unit, and is configured to send switching control signals to the switching unit according to the detection voltages;

[0012] The switching unit is configured to transmit enable signals to the enable control terminals of one of the power modules according to the switching control signals, so that one of the power modules works and the other power modules do not work; or the switching unit is configured to transmit disable signals to the disable terminals of at least one of the power modules according to the switching control signals, so that one of the power modules works and the other power modules do not work.

[0013] Optionally, the at least two power supply modules include a main power supply module and a backup power supply module, the at least two voltage detection modules include a main voltage detection module and a backup voltage detection module, and the at least two isolation modules include a first isolation module and a second isolation module, the first isolation module is connected between an output end of the main power supply module and the load, and the second isolation module is connected between an output end of the backup power supply module and the load.

[0014] The main voltage detection module is electrically connected to the output end of the main power supply module, and the backup voltage detection module is electrically connected to the output end of the backup power supply module; the control module is configured to, when the main power supply module is working, determine that the main power supply module has an abnormality according to a first detection voltage output by the main voltage detection module, control the main power supply module to stop working, and control the backup power supply module to start working.

[0015] Alternatively, the control module is configured to, when the backup power supply module is working, determine that the backup power supply module has an abnormality according to a second detection voltage output by the backup voltage detection module, control the backup power supply module to stop working, and control the main power supply module to start working.

[0016] Optionally, the switching unit includes a first relay, the first relay includes a first coil and a second coil, the first coil and the second coil are electrically connected to different control signal output ends of the control unit, the first relay further includes a first common contact, a second common contact, a first selection contact, a second selection contact, a third selection contact and a fourth selection contact, the first common contact and the second common contact are grounded, the first selection contact and the fourth selection contact are suspended, the second selection contact is electrically connected to a disable end of the main power supply module, and the third selection contact is electrically connected to a disable end of the backup power supply module.

[0017] The control unit is configured to control the main power supply module to work by outputting a first level signal to the first coil and outputting a second level signal to the second coil, so that the first common contact is connected to the first selection contact, and the second common contact is electrically connected to the third selection contact.

[0018] The control unit is configured to control the backup power supply module to work by outputting the second level signal to the first coil and outputting the first level signal to the second coil, so that the first common contact is connected to the second selection contact, and the second common contact is electrically connected to the fourth selection contact.

[0019] Optionally, the control unit includes a star computer.

[0020] Optionally, the isolation module includes a diode, a positive electrode of the diode is electrically connected to the output end of the corresponding power supply module, and a negative electrode of the diode is configured to be connected to the load.

[0021] Optionally, the voltage detection module comprises an operational amplifier, a non-inverting input terminal of the operational amplifier is electrically connected with the output terminal of the corresponding power module, an inverting input terminal of the operational amplifier is grounded, and an output terminal of the operational amplifier is electrically connected with the control module.

[0022] Optionally, the voltage detection module comprises a voltage dividing circuit.

[0023] Optionally, the power module comprises a DC / DC power supply.

[0024] According to another aspect of the present application, a satellite power supply system is provided, comprising the power supply circuit of any of the above embodiments.

[0025] The power supply circuit and the satellite power supply system of the present application have the following advantages: the control module controls one of the power modules to work according to the detection voltage detected by the voltage detection module, that is, the power module of the power supply circuit works in a cold backup mode, only one power module works at the same time, and the power module that does not work will not be affected by the space particle radiation, so that even if one of the power modules is damaged due to the space particle radiation, the other power modules can continue to supply power to the load, which is beneficial to improve the power supply reliability of the power supply circuit. The isolation module is arranged between the output terminal of the power module and the load, the isolation module can isolate the mutual influence between different power modules, and is beneficial to further improve the power supply reliability of the power supply circuit. In addition, the power supply circuit has a simple structure and is easy to implement in engineering, and has a wide application prospect in the field of microsatellites.

[0026] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a structural schematic diagram of a power supply circuit provided by the embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of another power supply circuit provided by the embodiment of the present application;

[0030] Figure 3is a structural schematic view of another power supply circuit provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to make the person in the technical field better understand the utility model scheme, the following will combine the drawings in the embodiment of the utility model, and the technical scheme in the embodiment of the utility model is clearly and completely described, obviously, the described embodiment is only a part of the embodiment of the utility model, and is not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making the creative labor should belong to the protection scope of the utility model.

[0032] It should be noted that the terms "first", "second" and the like in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiment of the utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any modification thereof are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0033] Figure 1 is a structural schematic view of a power supply circuit provided by the embodiment of the utility model, which can be included in a satellite power supply system. Referring to Figure 1 The power supply circuit includes at least two power supply modules 110, at least two voltage detection modules 120, at least two isolation modules 130 and a control module 140; the voltage detection module 120 is electrically connected with the output end OUT of the corresponding power supply module 110 and the control module 140 respectively, and is used for outputting the corresponding detection voltage to the control module 140 according to the output voltage of the power supply module 110; the control module 140 is used for controlling one of the power supply modules 110 to work according to the detection voltage; the isolation module 130 is connected between the output end OUT of the corresponding power supply module 110 and the load.

[0034] Optionally, the power supply module 110 includes a DC / DC power supply. The input end of the power supply module 110 can be connected with a primary power supply, and the DC / DC power supply serves as a secondary power supply. The DC / DC power supply can perform voltage conversion on the output voltage of the primary power supply.

[0035] The voltage detection module 120 and the power supply module 110 can be in one-to-one correspondence, that is, the output end OUT of each power supply module 110 is connected to one voltage detection module 120, and different voltage detection modules 120 are connected to different power supply modules 110. The voltage detection module 120 can output a corresponding detection voltage to the control module 140 according to the output voltage of the output end OUT of the power supply module 110, the control module 140 can determine the output voltage of the power supply module 110 according to the detection voltage, and then determine whether the currently working power supply module 110 is abnormal according to the output voltage of the power supply module 110, and switch to work with other power supply modules 110 to supply power to the load when it is determined that an abnormality occurs. In some optional embodiments, the detection voltage output by the voltage detection module 120 is equal to the output voltage of the power supply module 110. In other optional embodiments, the detection voltage output by the voltage detection module 120 can be greater than or less than the output voltage of the power supply module 110, and the detection voltage and the output voltage have a certain corresponding relationship, and the output voltage corresponding to different detection voltages is different.

[0036] The isolation module 130 and the power supply module 110 can be in one-to-one correspondence, that is, the output end OUT of each power supply module 110 is connected to one isolation module 130, and different isolation modules 130 are connected to different power supply modules 110. The isolation module 130 is used to isolate the mutual influence between different power supply modules 110, for example, the isolation module 130 is used to prevent the existence of a current path between two power supply modules 110. The setting of the isolation module 130 is beneficial to improve the power supply reliability of the power supply circuit.

[0037] In this embodiment, the working process of the power supply circuit is as follows: at the initial moment when the power supply circuit starts to supply power, the control module 140 selects one of the at least two power supply modules 110 to work and supply power to the load. The power supply module 110 selected at the initial moment can be any one of the at least two power supply modules 110. During the process of supplying power to the load by the power supply module 110, the voltage detection module 120 connected to the output end OUT of the power supply module 110 outputs a detection voltage to the control module 140 according to the output voltage of the power supply module 110, the control module 140 determines the output voltage of the power supply module 110 according to the detection voltage, and when the output voltage exceeds the normal range, the control module 140 controls the power supply module 110 to stop supplying power and controls one of the remaining power supply modules 110 to supply power to the load, so that the power supply modules 110 of the power supply circuit work in a cold backup mode.

[0038] The power supply circuit of the embodiment is provided with a control module, which controls one of the power supply modules to work according to the detection voltage detected by the voltage detection module, that is, the power supply modules of the power supply circuit work in a cold backup mode, only one power supply module works at the same time, and the power supply module that does not work will not be affected by the space particle radiation, so that even if one power supply module is damaged due to the space particle radiation, the other power supply modules can continue to supply power to the load, which is beneficial to improve the power supply reliability of the power supply circuit. The isolation module is arranged between the output end of the power supply module and the load, the isolation module can isolate the mutual influence between different power supply modules, which is beneficial to further improve the power supply reliability of the power supply circuit. In addition, the power supply circuit has a simple structure and is easy to implement in engineering, and has a wide application prospect in the field of microsatellites.

[0039] Figure 2 is a structural schematic diagram of another power supply circuit provided by the embodiment of the utility model, referring to Figure 2 Optionally, the control module 140 comprises a control unit 141 and a switch unit 142; the control unit 141 is electrically connected with the voltage detection module 120 and the control end of the switch unit 142 respectively, and is used for sending a switch control signal to the switch unit 142 according to the detection voltage; the switch unit 142 is used for transmitting an enable signal to the enable control end of one of the power supply modules 110 according to the switch control signal, so that one of the power supply modules 110 works and the other power supply modules 110 do not work; or the switch unit 142 is used for transmitting a prohibition signal to the prohibition end of at least one of the power supply modules 110 according to the switch control signal, so that one of the power supply modules 110 works and the other power supply modules 110 do not work.

[0040] Optionally, the control unit 141 can comprise a single-chip microcomputer or a computer. In some embodiments, the control unit 141 comprises a satellite computer, wherein the satellite computer is a computer installed on an artificial satellite or a spacecraft. The switch unit 142 can comprise a switching device such as a transistor or a relay. In some embodiments, the switch unit 142 comprises one switching device, and the working state of the plurality of power supply modules 110 is controlled through one switching device. Optionally, the switch unit 142 comprises a multiplexer. In other embodiments, the switch unit 142 can comprise at least two switching devices, the switching devices are electrically connected with the power supply modules 110 one by one, and the control module 140 controls the power supply state of the corresponding power supply module 110 by controlling the conduction state of the switching device.

[0041] At the initial moment when the power supply circuit starts to supply power, the control unit 141 can send an initial switch control signal to the switch unit 142. In some embodiments, the switch unit 142 is electrically connected with the enable control end of the power module 10. The initial switch control signal is used to control the switch unit 142 to transmit an enable signal to the enable control end of one of the power modules 110, and transmit a non-enable signal to the enable control end of the remaining power modules 110, so that the power module 110 receiving the enable control signal supplies power to the load. The above-mentioned one of the power modules 110 can be any one of the power modules 110. During the power supply process of the power module 110, the voltage detection module 120 detects the output voltage of the power module 110, and when the output voltage exceeds the normal range, the control unit 141 can send a switch control signal different from the initial switch control signal to the switch unit 142, so that the switch unit 142 transmits a non-enable signal to the enable control end of the power module 110 supplying power at the initial moment, and the switch unit 142 transmits an enable signal to the enable control end of one of the remaining power modules 110, so that another power module 110 supplies power to the load. In other embodiments, the switch unit 142 is electrically connected with the enable control end of the power module 10. The initial switch control signal can also be used to control the switch unit 142 to transmit a non-inhibit signal to the inhibit end of one of the power modules 110, and transmit an inhibit signal to the enable control end of the remaining power modules 110, so that the power module 110 receiving the non-inhibit signal supplies power to the load. The above-mentioned one of the power modules 110 can be any one of the power modules 110. During the power supply process of the power module 110, the voltage detection module 120 detects the output voltage of the power module 110, and when the output voltage exceeds the normal range, the control unit 141 can send a switch control signal different from the initial switch control signal to the switch unit 142, so that the switch unit 142 transmits an inhibit signal to the inhibit end of the power module 110 supplying power at the initial moment, and the switch unit 142 transmits a non-inhibit signal to the inhibit end of one of the remaining power modules 110, so that another power module 110 supplies power to the load.

[0042] Figure 3 is another structure schematic view of a power supply circuit provided by the embodiment of the utility model, refer to Figure 3Optionally, the at least two power supply modules include a main power supply module 111 and a backup power supply module 112, the at least two voltage detection modules include a main voltage detection module 121 and a backup voltage detection module 122, and the at least two isolation modules include a first isolation module 131 and a second isolation module 132. The first isolation module 131 is connected between an output end (a first output end OUT1) of the main power supply module 111 and the load, and the second isolation module 132 is connected between an output end (a second output end OUT2) of the backup power supply module 112 and the load. The main voltage detection module 121 is electrically connected to the output end (the first output end OUT1) of the main power supply module 111, and the backup voltage detection module 122 is electrically connected to the output end (the second output end OUT2) of the backup power supply module 112. The control module is configured to control the main power supply module 111 to work, determine that the main power supply module 111 has an abnormality according to a first detection voltage output by the main voltage detection module 121, control the main power supply module 111 to stop working and control the backup power supply module 112 to start working, or control the backup power supply module 112 to work, determine that the backup power supply module 112 has an abnormality according to a second detection voltage output by the backup voltage detection module 122, control the backup power supply module 112 to stop working and control the main power supply module 111 to start working. The ground ends of the main power supply module 111 and the backup power supply module 112 are grounded. In this way, when the main power supply module 111 is damaged, the backup power supply module 112 can be switched to supply power to the load in time; similarly, when the backup power supply module 112 is damaged, the main power supply module 111 can be switched to supply power to the load in time, and only one of the main power supply module 111 and the backup power supply module 112 works to supply power to the load at the same time, which is beneficial to improving the power supply reliability.

[0043] With continued reference to Figure 3Optionally, the switch unit 142 comprises a first relay K1, the first relay K1 comprises a first coil L1 and a second coil L2, the first coil L1 and the second coil L2 are electrically connected with different control signal output ends of the control unit 141; the first relay K1 further comprises a first common contact A1, a second common contact A2, a first selection contact B1, a second selection contact B2, a third selection contact B3 and a fourth selection contact B4; wherein the first common contact A1 and the second common contact A2 are grounded GND, the first selection contact B1 and the fourth selection contact B4 are suspended, the second selection contact B2 is electrically connected with a disable end (a first disable end J1) of the main power supply module 111, and the third selection contact B3 is electrically connected with a disable end (a second disable end J2) of the backup power supply module 112; the control unit 141 is used for controlling the first common contact A1 to be connected with the first selection contact B1 and the second common contact A2 to be electrically connected with the third selection contact B3 by outputting a first level signal to the first coil L1 and outputting a second level signal to the second coil L2, so as to control the main power supply module 111 to work; the control unit 141 is used for controlling the first common contact A1 to be connected with the second selection contact B2 and the second common contact A2 to be electrically connected with the fourth selection contact B4 by outputting the second level signal to the first coil L1 and outputting the first level signal to the second coil L2, so as to control the backup power supply module 112 to work.

[0044] Optionally, at the initial time when the power supply circuit supplies power to the load, the control unit 141 can control the main power supply module 111 to work by sending an initial switch control signal to the switch unit 142. Specifically, the control unit 141 can output a first level signal to the first coil L1 and output a second level signal to the second coil L2 to control the first common contact A1 to be connected with the first selection contact B1 and the second common contact A2 to be connected with the third selection contact B3, so that the ground signal is transmitted to the disable terminal of the backup power supply module 112 through the switch unit 142, and the backup power supply module 112 does not work according to the ground signal of the disable terminal thereof. In this case, since the second selection contact B2 is not connected with the first common contact A1, the disable terminal of the main power supply module 111 does not receive the ground signal, and the main power supply module 111 works. During the power supply process of the main power supply module 111, the main voltage detection module 121 detects the output voltage of the output terminal of the main power supply module 111 in real time, and when the control unit 141 determines that the output voltage of the main power supply module 111 exceeds the normal range, the control unit 141 outputs a second level signal to the first coil L1 and outputs a first level signal to the second coil L2 to control the first common contact A1 to be connected with the second selection contact B2, so that the ground signal is transmitted to the disable terminal of the main power supply module 111, and the main power supply module 111 stops power supply. The control unit 141 also controls the second common contact A2 to be connected with the fourth selection contact B4, so that the disable terminal of the backup power supply module 112 no longer receives the ground signal, and the backup power supply module 112 starts to work to supply power to the load.

[0045] wherein the first level signal and the second level signal are opposite level signals, and for example, the first level signal is a low level signal and the second level signal is a high level signal. Optionally, the first end of the first coil L1 is electrically connected with the control unit 141, and the second end of the first coil L1 is connected with a high level power supply voltage; the first end of the second coil L2 is electrically connected with the control unit 141, and the second end of the second coil L2 is connected with a high level power supply voltage.

[0046] It should be noted that the above only gives an optional embodiment of the switch unit 142, and in another embodiment of the present application, the switch unit 142 can be realized by other manners. For example, the switch unit 142 can include two switch devices, for example, denoted as a first switch device and a second switch device, wherein the control end of the first switch device is electrically connected with the control unit, the first end of the first switch device is grounded, and the second end of the first switch device is electrically connected with the inhibit end of the main power supply module; the control end of the second switch device is electrically connected with the control unit, the first end of the second switch device is grounded, and the second end of the second switch device is electrically connected with the inhibit end of the backup power supply module; the control unit realizes the working of the main power supply module or the working of the backup power supply by respectively outputting different switch control signals to the control ends of the first switch device and the second switch device.

[0047] With reference to the foregoing Figure 3 Optionally, the isolation module includes a diode, the anode of the diode is electrically connected with the output end of the corresponding power supply module, and the cathode of the diode is used for connecting the load.

[0048] The cathodes of the diodes are electrically connected. The diodes can prevent reverse current flow and can prevent the existence of a current path between the two power supply modules, thereby improving power supply reliability.

[0049] Optionally, the first isolation module 131 connected with the main power supply module 111 includes a first diode D1, and the second isolation module 132 connected with the backup power supply module 112 includes a second diode D2.

[0050] With reference to the foregoing Figure 3 Optionally, the voltage detection module includes an operational amplifier, the non-inverting input end of the operational amplifier is electrically connected with the output end of the corresponding power supply module, the inverting input end of the operational amplifier is grounded, and the output end of the operational amplifier is electrically connected with the control module.

[0051] Specifically, the main voltage detection module 121 connected with the main power supply module 111 can include a first operational amplifier U1, and the backup voltage detection module 122 connected with the backup power supply module 112 can include a second operational amplifier U2. The first reference voltage end of the first operational amplifier U1 is connected with a set voltage VCC, and the second reference voltage end of the first operational amplifier U1 is grounded GND; the first reference voltage end of the second operational amplifier U2 is connected with the set voltage VCC, and the second reference voltage end of the first operational amplifier U1 is grounded GND. The set voltage VCC is a fixed voltage and is greater than the ground voltage.

[0052] In another optional embodiment, the voltage detection module comprises a voltage dividing circuit, an input end of the voltage dividing circuit is connected to an output end of the power supply module, and a voltage dividing output end of the voltage dividing circuit is connected to the control module, and the control module can determine the output voltage of the power supply module according to the voltage output by the voltage dividing circuit and a voltage dividing ratio of the voltage dividing circuit.

[0053] The satellite power supply system according to the embodiments of the present application comprises the power supply circuit according to any of the above embodiments of the present application, and can be a power supply on a satellite or an aerospace vehicle, and has the beneficial effects of the power supply circuit according to any of the above embodiments of the present application.

[0054] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, and the present application does not limit this.

[0055] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A power supply circuit, characterized by comprising: The application relates to a power supply system, which comprises at least two power supply modules, at least two voltage detection modules, at least two isolation modules and a control module. The voltage detection modules are electrically connected with the output ends of the corresponding power supply modules and the control module, and are used for outputting corresponding detection voltages to the control module according to the output voltages of the power supply modules. The control module is used for controlling one of the power supply modules to work according to the detection voltages. The isolation modules are connected between the output ends of the corresponding power supply modules and loads. The control module comprises a control unit and a switch unit.

2. The power supply circuit according to claim 1, characterized in that, The control unit is electrically connected with the voltage detection modules and the control end of the switch unit, and is used for sending switch control signals to the switch unit according to the detection voltages. The switch unit is used for transmitting an enable signal to the enable control end of one of the power supply modules according to the switch control signals, so that one of the power supply modules works and the other power supply modules do not work; or the switch unit is used for transmitting an inhibition signal to the inhibition end of at least one of the power supply modules according to the switch control signals, so that one of the power supply modules works and the other power supply modules do not work. The at least two power supply modules comprise a main power supply module and a backup power supply module, the at least two voltage detection modules comprise a main voltage detection module and a backup voltage detection module, the at least two isolation modules comprise a first isolation module and a second isolation module, the first isolation module is connected between the output end of the main power supply module and the load, and the second isolation module is connected between the output end of the backup power supply module and the load.

3. The power supply circuit of claim 2, wherein, The main voltage detection module is electrically connected with the output end of the main power supply module, the backup voltage detection module is electrically connected with the output end of the backup power supply module, the control module is used for controlling the main power supply module to work, determining that the main power supply module has an abnormality according to a first detection voltage output by the main voltage detection module, and controlling the main power supply module to stop working and the backup power supply module to start working. Or, the control module is used for controlling the backup power supply module to work, determining that the backup power supply module has an abnormality according to a second detection voltage output by the backup voltage detection module, and controlling the backup power supply module to stop working and the main power supply module to start working. The switch unit comprises a first relay, the first relay comprises a first coil and a second coil, the first coil and the second coil are electrically connected with different control signal output ends of the control unit, the first relay further comprises a first common contact, a second common contact, a first selection contact, a second selection contact, a third selection contact and a fourth selection contact, the first common contact and the second common contact are grounded, the first selection contact and the fourth selection contact are suspended, the second selection contact is electrically connected with the inhibition end of the main power supply module, and the third selection contact is electrically connected with the inhibition end of the backup power supply module.

4. The power supply circuit as claimed in claim 3, characterized in that ​ The control unit is configured to control the first common contact to be connected with the first selection contact and the second common contact to be connected with the third selection contact by outputting a first level signal to the first coil and a second level signal to the second coil, so as to control the main power supply module to work. The control unit is configured to control the first common contact to be connected with the second selection contact and the second common contact to be connected with the fourth selection contact by outputting the second level signal to the first coil and the first level signal to the second coil, so as to control the backup power supply module to work.

5. The power supply circuit of claim 2, wherein, The control unit comprises a star computer.

6. The power supply circuit of claim 1, wherein, The isolation module comprises a diode, a positive electrode of the diode is electrically connected with an output end of the corresponding power supply module, and a negative electrode of the diode is configured to be connected with the load.

7. The power supply circuit of claim 1, wherein, The voltage detection module comprises an operational amplifier, a non-inverting input end of the operational amplifier is electrically connected with an output end of the corresponding power supply module, an inverting input end of the operational amplifier is grounded, and an output end of the operational amplifier is electrically connected with the control module.

8. The power supply circuit of claim 1, wherein, The voltage detection module comprises a voltage dividing circuit.

9. The power supply circuit of claim 1, wherein, The power supply module comprises a DC / DC power supply.

10. A satellite power system, characterized by, The power supply circuit comprises any one of claims 1-9.

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