A power supply and power supply system

Abstract

The application discloses a kind of power supply and power supply system, and power supply includes: first power taking circuit outputs multiple first amplitude voltage;First backup power taking circuit outputs second amplitude voltage;The output end of second power taking circuit is connected in parallel with the output end of first backup power taking circuit by diode, and second power taking circuit converts first amplitude voltage into second amplitude voltage;The output end of second backup power taking circuit is connected in parallel with the output end of any one of first power taking circuit by diode, and second backup power taking circuit converts second amplitude voltage into first amplitude voltage;When first power taking circuit output is abnormal, second backup power taking circuit replaces first power taking circuit and outputs first amplitude voltage;When second power taking circuit output is abnormal, first backup power taking circuit replaces second power taking circuit and outputs second amplitude voltage, to realize internal redundancy power supply of power supply, guarantee power supply reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extra-high voltage direct current transmission, in particular to a power supply and a power supply system. BACKGROUND

[0002] In the converter valve sub-module of the extra-high voltage direct current transmission, the power supply is the only power source for all the boards in the sub-module. It takes power from both ends of the DC support capacitor of the sub-module, and realizes the control, driving and energy storage power supply for each component in the sub-module through the isolation of the switching power supply. The conventional power supply design scheme for AC 220V mains cannot be directly applied in such a wide voltage range and an application environment of up to tens of kilovolts or even hundreds of kilovolts. Moreover, in such an environment, there is a severe electromagnetic application environment, which, in the form of electric and magnetic field energy, radiates through space, causes line crosstalk and coupling, and poses a not small problem for the safe power taking and reliable and stable power supply of the power supply in the converter valve. The conventional power supply only takes power from the single sub-module, provides 15-24V power supply for the control board and IGBT driving board, and provides 200-400V power supply for the bypass switch energy storage capacitor, and each output power supply has only one implementation mode. Once the internal related circuit of the main power supply fails, the corresponding output voltage cannot be provided, the sub-module cannot communicate with the upper control unit, and the system fails to operate. If the output 200-400V voltage for providing energy for the bypass switch is invalid, the sub-module cannot execute the last protection barrier--hardware protection, resulting in sub-module explosion and system shutdown. Directly or indirectly, it causes a series of engineering safety hazards and economic losses. The power supply failure in the engineering site has fully exposed the weak point of the single power supply and single output power supply. SUMMARY

[0003] Therefore, the technical problem to be solved by the present application is to overcome the defect of poor reliability of the single power supply and single output power supply in the prior art, so as to provide a power supply and a power supply system.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] In a first aspect, an embodiment of the present application provides a power supply, comprising: a first power taking circuit, a second power taking circuit, a first backup power taking circuit, a second backup power taking circuit, and a plurality of diodes; the first power taking circuit takes power from a DC support capacitor of a converter valve sub-module and outputs a plurality of first amplitude voltages; the first backup power taking circuit takes power from the DC support capacitor of the converter valve sub-module and outputs a second amplitude voltage; an input end of the second power taking circuit is connected to any one output end of the first power taking circuit, an output end of the second power taking circuit is connected in parallel to an output end of the first backup power taking circuit through a diode, and the second power taking circuit converts the first amplitude voltage into the second amplitude voltage; an input end of the second backup power taking circuit is connected to the output end of the first backup power taking circuit, an output end of the second backup power taking circuit is connected in parallel to any one output end of the first power taking circuit through a diode, and the second backup power taking circuit converts the second amplitude voltage into the first amplitude voltage; when the first power taking circuit outputs abnormally, the second backup power taking circuit replaces the first power taking circuit to output the first amplitude voltage; and when the second power taking circuit outputs abnormally, the first backup power taking circuit replaces the second power taking circuit to output the second amplitude voltage.

[0006] In an embodiment, the power supply further comprises: an input filter circuit; the first power taking circuit and the first backup power taking circuit take power from the DC support capacitor of the converter valve sub-module through the input filter circuit.

[0007] In an embodiment, the first power taking circuit comprises: a plurality of switching power supplies; the plurality of switching power supplies are connected in cascade.

[0008] In an embodiment, the power supply further comprises: a voltage equalization support circuit; the voltage equalization support circuit is connected between the input filter circuit and the first power taking circuit; and the voltage equalization support circuit is used to divide the input voltage into a plurality of levels of voltage, and each level of voltage is input to a corresponding switching power supply.

[0009] In an embodiment, the power supply further comprises: a plurality of output filter circuits; and the output filter circuits are used to filter the first amplitude voltage or the second amplitude voltage.

[0010] In an embodiment, the power supply further comprises: a current limiting circuit; and the current limiting circuit is connected between the first backup power taking circuit and the second backup power taking circuit.

[0011] In an embodiment, the power supply further comprises: a plurality of overvoltage and undervoltage protection circuits; and the overvoltage and undervoltage protection circuits are used to monitor whether the output voltage of the first power taking circuit and the output voltage of the second power taking circuit are overvoltage or undervoltage.

[0012] In an embodiment, the power supply further comprises: a control chip and a starting circuit; the control chip is used to drive the first power supply circuit, the second power supply circuit, the first backup power supply circuit and the second backup power supply circuit to work; the starting circuit is connected between the input filter circuit and the first power supply circuit; when the control chip is started, the starting circuit is used to control the output voltage of the first power supply circuit to be greater than the starting threshold voltage of the control chip.

[0013] In an embodiment, the power supply further comprises: a fault reporting circuit; the control chip is connected with the over-voltage and under-voltage protection circuit; the fault reporting circuit reports the output voltage of the first power supply circuit, the over-voltage information and the under-voltage information of the output voltage of the second power supply circuit to an upper computer.

[0014] In a second aspect, the application provides a power supply system, comprising: at least two power supply circuits of the first aspect; for each power supply circuit, each output end of the first power supply circuit is further connected in parallel with one output end of the first power supply circuit of another power supply circuit through a diode; the first power supply circuit of the main power supply circuit, the second backup power supply circuit of the main power supply circuit and the first power supply circuit of another power supply circuit are backup power supplies of each other.

[0015] The technical scheme of the application has the following advantages:

[0016] 1. The power supply provided by the application has the following advantages: the first power supply circuit outputs a plurality of first amplitude voltages; the first backup power supply circuit outputs a second amplitude voltage; the input end of the second power supply circuit is connected with any one output end of the first power supply circuit, the output end of the second power supply circuit is connected in parallel with the output end of the first backup power supply circuit through a diode, and the second power supply circuit converts the first amplitude voltage into the second amplitude voltage; the input end of the second backup power supply circuit is connected with the output end of the first backup power supply circuit, the output end of the second backup power supply circuit is connected in parallel with any one output end of the first power supply circuit through a diode, and the second backup power supply circuit converts the second amplitude voltage into the first amplitude voltage; when the first power supply circuit outputs abnormally, the second backup power supply circuit replaces the first power supply circuit to output the first amplitude voltage; when the second power supply circuit outputs abnormally, the first backup power supply circuit replaces the second power supply circuit to output the second amplitude voltage, thereby realizing internal redundant power supply of the power supply and ensuring power supply reliability.

[0017] 2. The power supply system provided by the present application comprises at least two energy-taking power supplies; for each energy-taking power supply, each output end of the first energy-taking circuit is also connected in parallel with one output end of the first energy-taking circuit of another energy-taking power supply through a diode; the first energy-taking circuit of the body energy-taking power supply, the second backup energy-taking circuit of the body energy-taking power supply, and the first energy-taking circuit of another energy-taking power supply are backup power supplies for each other. The present application makes the output voltage of the first energy-taking circuit of the body energy-taking power supply and the first energy-taking circuit of the adjacent energy-taking power supply redundant backup for each other; and the output end of the first backup energy-taking circuit is also subjected to a DC / DC isolation power taking, two redundant protections are set, and the reliability is improved; the first backup energy-taking circuit is used as the power supply of the last barrier of the hardware protection of the sub-module, the scheme of the mutual backup of the second energy-taking circuit and the second backup energy-taking circuit is adopted, and the reliability of the power supply is greatly ensured. For the traditional single power supply scheme, the sub-module failure caused by the failure of the energy-taking power supply even rises to the system stoppage, and the scheme is a power supply design scheme with greatly improved reliability. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0019] Figure 1 The composition diagram of one specific example of the energy-taking power supply provided by the embodiment of the present application;

[0020] Figure 2a , Figure 2b The anti-reverse basic unit topologies provided by the embodiment of the present application;

[0021] Figure 3 The composition diagram of another specific example of the energy-taking power supply provided by the embodiment of the present application;

[0022] Figure 4 The topology diagram of the input filter circuit provided by the embodiment of the present application;

[0023] Figure 5 The composition diagram of another specific example of the energy-taking power supply provided by the embodiment of the present application;

[0024] Figure 6 The composition diagram of one specific example of the voltage equalization support circuit provided by the embodiment of the present application;

[0025] Figure 7 The composition diagram of another specific example of the energy-taking power supply provided by the embodiment of the present application;

[0026] Figure 8 The composition diagram of another specific example of the power supply provided for the embodiment of the present application is shown in FIG. 4.

[0027] Figure 9 The composition diagram of another specific example of the power supply provided for the embodiment of the present application is shown in FIG. 4.

[0028] Figure 10 The composition diagram of another specific example of the power supply provided for the embodiment of the present application is shown in FIG. 4.

[0029] Figure 11 The composition diagram of a specific example of the power supply system provided for the embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0031] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements; it can be wireless connection, or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0034] Embodiment 1

[0035] The present application provides a power supply, such asFigure 1 As shown, it comprises: a first energy taking circuit 101, a second energy taking circuit 102, a first backup energy taking circuit 103, a second backup energy taking circuit 104, and a plurality of diodes D.

[0036] As shown, the first energy taking circuit 101 takes energy from the DC support capacitor of the converter valve sub-module, and outputs a plurality of first amplitude voltages U1, which are mutually isolated, and the two paths are also mutually isolated from the input high voltage. Exemplarily, the first energy taking circuit 101 can output a plurality of 15-24V voltages. Figure 1

[0037] Optionally, the first energy taking circuit 101 comprises: a multi-stage switching power supply; the multi-stage switching power supply is connected in cascade, can withstand a wide input voltage range and high voltage resistance requirement, and the input voltage is fed back controlled through magnetic isolation to obtain the first amplitude voltage U1 of temperature.

[0038] Optionally, the first energy taking circuit 101 further comprises: an isolation driving amplification circuit, wherein the driving of the multi-stage switching power supply in the multi-stage cascade mode is to drive the MOSFET of the primary side through the isolation photocoupler or isolation transformer. In addition, the first energy taking circuit 101 further comprises a 15-24V voltage monitoring and protection circuit.

[0039] Exemplarily, the switching power supply can be a single-tube flyback power supply topology, and the basic unit of the topology is as shown in Figure 2a and Figure 2b As shown, wherein, Figure 2a is a flyback basic unit (ground end), Figure 2b is a flyback basic unit (high voltage end). Figure 2a and Figure 2b Among them, the N1 winding is the input winding of the high voltage end; the N2 winding output is one 15-24V output of the first energy taking circuit 101 of the body energy taking power supply; the N3 winding is another 15-24V output of the first energy taking circuit 101 of the body energy taking power supply; the output of Naux is the power supply of the control IC (control chip); according to the position of the basic topology, the topology connected with the ground potential adopts the flyback basic unit (ground end) in the main topology, and the topology with a floating potential above the ground end adopts the high voltage end topology. The control of all MOSFETs is completed by the control chip of the ground end, and the driving scheme of the MOSFETs of the basic power supply between different potentials is realized by the driving transformer isolation driving.

[0040] According to the cost requirement of the power supply, considering the highest voltage value of the input end, the number of series connection and parallel connection of the multi-stage input of the power supply can be 2-6 stages, and in the embodiment of the present application, the multi-stage switching power supply in the multi-stage cascade mode is realized by adopting a two-stage cascade mode.

[0041] As shown in Figure 1 ​As shown, the first backup power supply circuit 103 outputs a second amplitude voltage U2 after taking power from the DC support capacitor of the converter valve sub-module; for example, the first backup power supply circuit 103 can output a 200-400V voltage.

[0042] For example, the first backup power supply circuit 103 is a high-voltage linear backup circuit, which converts the input wide-range high voltage into a stable and reliable 200-400V power supply through a linear voltage regulator. The high-voltage linear backup circuit includes a linear voltage stabilizing circuit and a shutdown circuit.

[0043] As shown in Figure 1 The input end of the second power supply circuit 102 is connected to any one of the output ends of the first power supply circuit 101, and the output end of the second power supply circuit 102 is connected in parallel to the output end of the first backup power supply circuit 103 through a diode D, and the second power supply circuit 102 converts the first amplitude voltage U1 into the second amplitude voltage U2. Optionally, the second power supply circuit 102 can output a 200-400V voltage.

[0044] For example, the second power supply circuit 102 takes power from the first power supply circuit 101 and can use an isolated DC / DC to output a 200-400V voltage. The topology can be a single-tube forward, a single-tube flyback, or a push-pull isolated switching power supply circuit. The power supply is mainly used for power supply of the bypass switching capacitor.

[0045] For example, the first backup power supply circuit 103 and the second power supply circuit 102 are connected in parallel through a diode D. When the second power supply circuit 102 outputs normally, the first backup power supply circuit 103 does not work and does not consume energy. Once it is detected that the output voltage of the second power supply circuit 102 deviates from the rated voltage by a certain value, the output voltage of the first backup power supply circuit 103 replaces the normal output of the second power supply circuit 102. The main circuit (the second power supply circuit 102) and the high-voltage linear circuit (the first backup power supply circuit 103) are seamlessly switched, ensuring uninterrupted power supply of the power supply output, sufficient power supply voltage of the energy storage capacitor of the bypass switch, and supporting the energy required for the bypass switch to operate.

[0046] As shown in Figure 1 The input end of the second backup power supply circuit 104 is connected to the output end of the first backup power supply circuit 103, and the output end of the second backup power supply circuit is connected in parallel to any one of the output ends of the first power supply circuit 101 through a diode D, and the second backup power supply circuit 104 converts the second amplitude voltage U2 into the first amplitude voltage U1; the second backup power supply circuit 104 can output a 15-24V voltage.

[0047] Exemplarily, the second backup power supply circuit 104 is a linear power supply, and the output port of the first backup power supply circuit obtains a 15-24V voltage in the manner of a switching power supply. The linear power supply includes a step-down isolation power supply circuit, and the 15-24V output by the step-down isolation circuit is isolated from the input.

[0048] Exemplarily, the output voltage of the second backup power supply circuit 104 is lower than the rated output of the first power supply circuit 101, and the outputs of the two circuits are output in parallel through a diode D. Under normal working conditions, the isolation power supply (the second backup power supply circuit 104) of the DC / DC power supply output from the output end 200-400V of the first backup power supply circuit 103 provides a 15-24V output, which is output in parallel with the main circuit (the first power supply circuit 101). Once the 15-25V output voltage of the first power supply circuit 101 is lower than the rated output value, the second backup power supply circuit 104 outputs as the main power supply.

[0049] In a specific embodiment, as shown in Figure 3 The power supply further includes an input filter circuit 105, and the first power supply circuit 101 and the first backup power supply circuit 103 obtain power from the DC support capacitor of the converter valve sub-module through the input filter circuit 105. The input filter circuit 105 extracts the high-frequency signal coupled in the input voltage.

[0050] Optionally, in order to improve the EMC characteristics of the input end of the power supply, a differential mode inductance + common mode inductance combined filtering design is added to the input end of the power supply, which can effectively resist the influence of the conducted radiation, fast transient pulse group and surge interference of the input end. The EMC design requirements of the power supply are met. As shown in Figure 4 The input filter circuit 105 includes differential mode inductance (L1 and L2) and common mode inductance (LG1 and LG2).

[0051] In a specific embodiment, as shown in Figure 5 The power supply further includes a voltage equalization support circuit 106, and the voltage equalization support circuit 106 is connected between the input filter circuit 105 and the first power supply circuit 101. The voltage equalization support circuit 106 is used to divide the input voltage into multiple levels of voltage, and each level of voltage is input to a corresponding switching power supply.

[0052] Specifically, due to the wide range of high input voltage, limited by the existing switch tube capacity and stress upper limit, the single isolation switch unit has been difficult to achieve wide range high voltage application characteristics. Therefore, multiple switch power supply in series to achieve high voltage work requirements, that is, the first energy circuit 101 includes: multiple switch power supply; the multiple switch power supply is connected in cascade, which can withstand wide input voltage range and high voltage requirement. In order to ensure the stress of each stage switch power supply, the input DC voltage is decomposed into multiple voltage equal DC voltage series through the multi-stage resistance and capacitance series mode. The voltage support circuit 106 is as shown in Figure 6

[0053] Optionally, the voltage support circuit 106 includes a series combination of basic units of DC filter capacitor and resistance in parallel.

[0054] In a specific embodiment, as shown in Figure 7 The energy supply further includes: a plurality of output filter circuits 107; the output filter circuit 107 is used for filtering the first amplitude voltage U1 or the second amplitude voltage U2.

[0055] Specifically, the output filter circuit 107 suppresses the high frequency harmonic interference of the first amplitude voltage U1 and is used to suppress the conducted interference of the first amplitude voltage U1 port from the outside; the output filter circuit 107 suppresses the high frequency harmonic interference of the output second amplitude voltage U2 and is used to suppress the conducted interference of the second amplitude voltage U2 port from the outside.

[0056] Optionally, the output filter circuit 107 includes a combination circuit of differential common mode inductance, TVS and voltage-dependent resistor for suppressing conduction and radiation.

[0057] In a specific embodiment, as shown in Figure 8 The energy supply further includes: a current limiting circuit 108; the current limiting circuit 108 is connected between the first backup energy circuit 103 and the second backup energy circuit 104 to suppress the overcurrent of the second backup energy circuit 104.

[0058] In a specific embodiment, as shown in Figure 9 The energy supply further includes: a plurality of overvoltage and undervoltage protection circuits 109; the overvoltage and undervoltage protection circuit 109 is used for monitoring whether the output voltage of the first energy circuit 101 and the output voltage of the second energy circuit 102 are overvoltage or undervoltage, and when there is overvoltage or undervoltage, the protection mechanism is started.

[0059] Specifically, the overvoltage and undervoltage protection circuit 109 realizes overvoltage comparison and undervoltage comparison through threshold comparison circuit to judge whether there is overvoltage or undervoltage phenomenon; in addition, an overcurrent protection circuit can be set to judge whether there is overcurrent, and the protection mechanism is started when there is overcurrent.

[0060] ​In a specific embodiment, the energy-taking power supply further comprises: a control chip and a starting circuit; the control chip is used to drive the first energy-taking circuit 101, the second energy-taking circuit 102, the first backup energy-taking power supply and the second backup energy-taking power supply to work; as shown in Figure 10 The starting circuit 110 is connected between the input filter circuit 105 and the first energy-taking circuit 101, and the starting circuit 110 comprises a starting charging current-limiting circuit 108 and a charging loop shutdown circuit; when the control chip is started, the starting circuit 110 is used to control the output voltage of the first energy-taking circuit 101 to be greater than the starting threshold voltage of the control chip.

[0061] Specifically, the starting circuit 110 obtains energy from the input power supply end, provides initial power supply for the control chip of the first energy-taking circuit 101, and provides power-on energy for the starting of the power supply. That is, the control chip needs to be powered by the starting circuit 110. The starting circuit 110 needs to ensure that it can provide sufficient starting threshold voltage for the control chip during low-voltage starting, and after the control chip is started, the starting circuit 110 exits the work, does not consume energy, and can withstand high voltage of the system.

[0062] In a specific embodiment, the energy-taking power supply further comprises: a fault reporting circuit; the control chip is connected with the overvoltage and undervoltage protection circuit 109; the fault reporting circuit reports the overvoltage information and the undervoltage information of the output voltage of the first energy-taking circuit 101 and the output voltage of the second energy-taking circuit 102 to the upper computer.

[0063] Specifically, the first amplitude voltage U1 is used to supply power for the control panel and IGBT of the converter valve sub-module, the second amplitude voltage U2 is used to supply power for the bypass switch, and the control chip can be integrated on the control panel, and the fault reporting circuit is connected with the control panel. The fault signal of the energy-taking power supply collects the fault information of the two output power supplies, including the output overvoltage protection circuit and the output undervoltage protection circuit of the first energy-taking circuit 101, and the output overvoltage protection circuit and the output undervoltage protection circuit of the second energy-taking circuit 102. The fault signals of the first energy-taking circuit 101 and the second energy-taking circuit 102 are coupled into a light / electric signal output through an isolation optical coupler. The output signal is used as a state detection signal of the power supply body.

[0064] Embodiment 2

[0065] The embodiment of the present application provides a power supply system, as shown in Figure 11 The power supply system comprises at least two energy-taking power supplies 1 of the embodiment 1, each of the energy-taking power supplies 1 can supply power for the control panel, the IGBT drive and the bypass switch function of the body sub-module, and can also supply power for the control panel and the IGBT drive function of the adjacent sub-module in the case that the energy-taking power supply 1 of the adjacent sub-module fails. All the energy-taking power supplies 1 have the same structure, and the specific topology structure is as described in the embodiment 1, which will not be described here.

[0066] It should be noted that, taking the topology shown in Figure 1 as an example, the topology structure of the power supply system shown in Figure 11 , similarly, the topology of the power supply system can be transformed based on the topology shown in Figure 10 . Figure 11

[0067] As shown in Figure 11 , for each power supply 1, each output end of the first power supply circuit 101 is also connected in parallel with one output end of the first power supply circuit 101 of another power supply 1 through a diode D; the first power supply circuit 101 of the body power supply 1, the second backup power supply circuit 104 of the body power supply 1, and the first power supply circuit 101 of another power supply 1 are backup power supplies for each other.

[0068] Exemplarily, if the first amplitude voltage U1 is 15-24V voltage, the second amplitude voltage U2 is 200-400V voltage, and the first power supply circuit 101 outputs two 15-24V voltages, then Figure 11 , the 15-24V output has three sources: one is the first 15-24V output of the first power supply circuit 101 of the body power supply 1; the second is the 15-24V output of the second backup power supply circuit 104 of the body power supply 1; and the third is the second 15-24V output of the first power supply circuit 101 of the adjacent power supply 1. The 200-400V has two sources: one is the 200-400V output of the second power supply circuit 102 of the body power supply 1; the second is the 200-400V output of the second backup power supply circuit 104 of the body power supply 1. From the perspective of redundant backup, the 15-24V output of the power supply has three backup paths; the 200-400V output has two backup paths.

[0069] Specifically, Figure 11 , under normal circumstances, the power supply supplies power to the body power supply 1; if the first power supply circuit 101 of the body module power supply 1 fails, 15-24V can be provided by the first power supply circuit 101 of the adjacent power supply 1; if the first power supply circuit 101 of the body and adjacent sub-module power supply 1 fails, 200-400V can be provided by the first backup power supply circuit, and 15-24V can be provided by the second backup power supply circuit. However, EMC protection circuits need to be added to both output ports to ensure the electromagnetic compatibility reliability of the power supply.

[0070] ​Compared with the traditional single-output power supply scheme, the power supply system of the embodiment of the application has 15-24V output voltage and adjacent power taking power supply 1 as redundant backup; and itself takes power from the output end of the first backup power taking circuit 103 again, which is DC / DC isolation power taking, sets two redundant protections, and improves the reliability; 200-400V is used as the last barrier of the power supply of the sub-module hardware protection, adopts the scheme of the main body second power taking circuit 102 and the second backup power taking circuit as backup, which greatly ensures the reliability of the power supply. For the traditional single power supply scheme, the sub-module failure caused by the failure of the power taking power supply 1 even rises to system downtime, and the scheme is a power supply design scheme with greatly improved reliability.

[0071] Obviously, the above embodiments are only examples for clearly illustrating, but not limitation to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A power source for energy extraction, characterized in that, include: The circuit comprises a first power extraction circuit, a second power extraction circuit, a first backup power extraction circuit, a second backup power extraction circuit, and multiple diodes. After the first energy extraction circuit extracts energy from the DC support capacitor of the converter valve submodule, it outputs multiple first amplitude voltages. The first backup power circuit draws power from the DC support capacitor of the converter valve submodule and outputs a second amplitude voltage. The input terminal of the second energy harvesting circuit is connected to any one of the output terminals of the first energy harvesting circuit, and the output terminal of the second energy harvesting circuit is connected in parallel with the output terminal of the first backup energy harvesting circuit through the diode. The second energy harvesting circuit converts the first amplitude voltage into a second amplitude voltage. The input terminal of the second backup power extraction circuit is connected to the output terminal of the first backup power extraction circuit. The output terminal of the second backup power extraction circuit is connected in parallel with any one of the output terminals of the first power extraction circuit through the diode. The second backup power extraction circuit converts the second amplitude voltage into the first amplitude voltage. When the first power harvesting circuit outputs an abnormality, the second backup power harvesting circuit replaces the first power harvesting circuit and outputs the first amplitude voltage. When the second power extraction circuit outputs an abnormality, the first backup power extraction circuit replaces the second power extraction circuit to output a second amplitude voltage.

2. The power source according to claim 1, characterized in that, Also includes: Input filter circuit; The first power harvesting circuit and the first backup power harvesting circuit harvest power from the DC support capacitor of the converter valve submodule through the input filter circuit.

3. The power source according to claim 2, characterized in that, The first power extraction circuit includes: Multi-stage switching power supply; Multi-stage switching power supplies are cascaded together.

4. The power source according to claim 3, characterized in that, Also includes: Voltage equalization support circuit; The voltage equalization support circuit is connected between the input filter circuit and the first energy harvesting circuit; The voltage equalization support circuit is used to divide the input voltage into multiple voltage levels, with each voltage level input to the corresponding switching power supply.

5. The power source according to claim 4, characterized in that, Also includes: Multiple output filter circuits; The output filter circuit is used to filter the first amplitude voltage or the second amplitude voltage.

6. The power source according to claim 1, characterized in that, Also includes: Current limiting circuit; The current limiting circuit is connected between the first backup power harvesting circuit and the second backup power harvesting circuit.

7. The power source according to claim 2, characterized in that, Also includes: Multiple over / under voltage protection circuits; The over / under voltage protection circuit is used to monitor whether the output voltage of the first power harvesting circuit and the output voltage of the second power harvesting circuit are over-voltage or under-voltage.

8. The power source according to claim 7, characterized in that, Also includes: Control chip and startup circuit; The control chip is used to drive the first power harvesting circuit, the second power harvesting circuit, the first backup power harvesting circuit, and the second backup power harvesting circuit to work. The startup circuit is connected between the input filter circuit and the first energy harvesting circuit; When the control chip is started, the startup circuit is used to control the output voltage of the first energy harvesting circuit to be greater than the startup threshold voltage of the control chip.

9. The power source according to claim 8, characterized in that, Also includes: Fault reporting circuit; The control chip is connected to the over / under voltage protection circuit. The fault reporting circuit reports the overvoltage and undervoltage information of the output voltage of the first power harvesting circuit and the output voltage of the second power harvesting circuit to the host computer.

10. A power supply system, characterized in that, include: At least two of the power sources described in any one of claims 1-9; For each power source, each output terminal of the first power source circuit is also connected in parallel with one output terminal of the first power source circuit of another power source through a diode; The main power source has a first power extraction circuit, a second backup power extraction circuit, and a first power extraction circuit of another power source, which serve as backup power sources for each other.

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