A power unit backup power supply circuit and power system

Abstract

The invention discloses a power unit backup power supply circuit and a power system, comprising a first power module, a second power module, a power bypass switch and a voltage detection module. The input end of the first power module and the input end of the second power module are both connected to the power unit to obtain power. The output end of the first power module is connected to a power bypass drive unit that drives the power bypass switch of the power unit to supply power to the power bypass drive unit. The output end of the second power module is connected to a control module that controls the operation of the power bypass drive unit to supply power to the control module. The power bypass switch is connected in parallel with the input end of the second power module. The detection end of the voltage detection module is connected to the power unit. The output end of the voltage detection module is connected to the power bypass switch to drive the power bypass switch to operate according to a detection signal. The design provides backup protection for the operation of the power unit and provides power supply support for effective bypass when the main power supply fails.

Description

Technical Field

[0001] The present invention relates to the electrical field, and in particular to a power unit backup power supply circuit and a power system. Background Art

[0002] Multilevel topology is widely used in medium and high voltage power grids, such as reactive power compensation, frequency converter, flexible DC distribution network and other power, rail transit and new energy fields. MMC topology is usually used in the field of flexible DC transmission, which is composed of multiple cascaded power units, and corresponding to each power unit, a bypass switch and a bypass switch driving unit that can drive the bypass switch are connected in parallel at the AC end of the power unit. The control module can be connected to the power unit to control the operation of the power unit, and can also drive the bypass switch on and off through the bypass switch driving unit, so as to bypass the power unit in time when a power unit fails, so as not to affect the normal operation of other power units.

[0003] In order to provide energy for the control of the power unit and the bypass switch drive unit, each power unit includes a main power supply for the control module and the bypass switch drive unit. In order to improve the reliability of the power unit, it is crucial that the main power supply works reliably. However, due to the high working voltage, wide range, and high insulation requirements, the main power supply has a certain failure rate at the project site. When this power supply fails, the power unit will not be able to bypass effectively. If a problem occurs, it will cause the entire system to fail. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a power unit backup power supply circuit, which provides a reliable backup power supply when a main power supply fails, and reasonably bypasses the power unit according to the situation.

[0005] The present invention also proposes a power system. When a main power supply fails, a backup power supply supplies power to a power bypass drive unit, and supplies power and triggers a control module in time according to abnormal voltage changes, thereby controlling the power unit bypass and ensuring stable operation of the system.

[0006] According to a first aspect of an embodiment of the present invention, a power unit backup power supply circuit comprises: a first power supply module, wherein an input end of the first power supply module is connected to the power unit to obtain power, and an output end of the first power supply module is connected to a power bypass drive unit that drives a power bypass switch of the power unit to supply power to the power bypass drive unit; a second power supply module, wherein an input end of the second power supply module is connected to the power unit to obtain power, and an output end of the second power supply module is connected to a control module that controls the operation of the power bypass drive unit to supply power to the control module; a power bypass switch, wherein the power bypass switch is connected in parallel with an input end of the second power supply module; and a voltage detection module, wherein a detection end of the voltage detection module is connected to the power unit, and an output end of the voltage detection module is connected to the power bypass switch to drive the power bypass switch to operate according to a detection signal.

[0007] A power unit backup power supply circuit and a power system according to an embodiment of the present invention have at least the following beneficial effects:

[0008] In the power unit backup power supply circuit of the present invention, the first power module and the second power module can both draw power from the power unit, the first power module can supply power to the power bypass drive unit, and the power unit operates normally. At this time, the voltage detection module detects that the voltage of the power unit is stable, so the control power bypass switch is closed, and the input end of the second power module is bypassed. The second power module does not need to supply power to the control module. When the main power supply fails, the voltage of the power unit increases abnormally, and the first power module can still supply power to the power bypass drive unit. At this time, the voltage detection module detects that the voltage of the power unit increases, so the control power bypass switch is disconnected, and the second power module is The control module is powered and triggered. The control module drives the power bypass switch to close and self-lock through the power bypass drive unit, so that the input end of the power module is bypassed and stops operating, which will not affect the normal operation of other power modules. When the power module stops operating, the first power module and the second power module will lose power input and will also suspend operation. This design provides backup protection for the operation of the power unit. When the main power supply fails, it provides power supply support for effective bypass, and uses voltage detection to control the operation of the second power module to prevent multiple power supplies from supplying power to the control module and causing power supply disorder, and the operation of related modules can be automatically stopped after the power unit is bypassed.

[0009] According to some embodiments of the present invention, the voltage detection module includes a comparison unit and a power bypass driving unit, the comparison unit is connected to the power unit to obtain a detection signal and compare it, and the power bypass driving unit is respectively connected to the comparison unit and the power bypass switch to drive the power bypass switch to operate according to a control signal formed by the comparison.

[0010] According to some embodiments of the present invention, the voltage detection module further includes a signal acquisition unit, which is respectively connected to the power unit and the comparison unit to acquire a detection signal and output it to the comparison unit.

[0011] According to some embodiments of the present invention, the signal acquisition unit includes a resistor R3 and a resistor R5, and the comparison unit includes an adjustable reference source U2, a resistor R1 and a voltage regulator D7; one end of the resistor R5 is connected to the positive electrode of the DC end of the power unit, the other end of the resistor R5 is respectively connected to one end of the resistor R3 and the reference electrode of the adjustable reference source U2, the negative electrode of the adjustable reference source U2 is respectively connected to one end of the resistor R1, the cathode of the voltage regulator D7 and the power supply bypass drive unit, the other end of the resistor R1 is connected to the output end of the first power supply module, and the anode of the adjustable reference source U2 is respectively connected to the anode of the voltage regulator D7, the other end of the resistor R3 and the negative electrode of the DC end of the power unit.

[0012] According to some embodiments of the present invention, it also includes a resistor R2, a voltage regulator tube D6, a switch tube Q3 and a resistor R4; one end of the resistor R2 is connected to the negative electrode of the adjustable reference source U2, the other end of the resistor R2 is connected to the cathode of the voltage regulator tube D6, the anode of the voltage regulator tube D6 is connected to the control electrode of the switch tube Q3, the input electrode of the switch tube Q3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3, and the output electrode of the switch tube Q3 is electrically connected to the other end of the resistor R3.

[0013] According to some embodiments of the present invention, the first power module and the second power module are linear power supplies, switching power supplies or voltage stabilizing circuits.

[0014] According to some embodiments of the present invention, the first power module includes a switch tube Q7, a voltage regulator tube D4, a voltage regulator tube D5, a diode D3, a resistor R8, a resistor R9 and a capacitor C3; one end of the resistor R8 is respectively connected to the input end of the switch tube Q7 and the positive electrode of the DC end of the power unit, the other end of the resistor R8 is respectively connected to the control electrode of the switch tube Q7, the cathode of the voltage regulator tube D4 and the cathode of the voltage regulator tube D5, the output electrode of the switch tube Q7 is respectively connected to the anode of the voltage regulator tube D5 and the anode of the diode D3, the cathode of the diode D3 is connected to one end of the resistor R9, the other end of R9 is respectively connected to one end of the capacitor C3 and one electrode of the power bypass drive unit, the anode of the voltage regulator tube D4 is respectively connected to the other end of the capacitor C3, the other electrode of the power bypass drive unit and the negative electrode of the DC end of the power unit.

[0015] According to some embodiments of the present invention, it also includes a first discharge resistor Rup and a second discharge resistor Rdown; one end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit, one pole of the input end of the first power module, and one pole of the detection end of the voltage detection module, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module and one end of the second discharge resistor Rdown, and the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit, the other pole of the input end of the first power module, the other pole of the detection end of the voltage detection module, and the other pole of the input end of the second power module.

[0016] According to a second aspect of an embodiment of the present invention, a power system includes a power unit, a power bypass switch, a power bypass drive unit, a control module, and a power unit backup power supply circuit disclosed in any of the above embodiments, wherein the power bypass switch is connected in parallel with the AC end of the power unit, the control module is connected to the power unit to control the operation of the power unit, the input end of the first power supply module is connected to the DC end of the power unit to obtain power, the output end of the first power supply module is connected to the power bypass drive unit to supply power to the power bypass drive unit, the input end of the second power supply module is connected to the DC end of the power unit to obtain power, the output end of the second power supply module is connected to the control module to supply power to the control module, and the control module is connected to the power bypass drive unit to drive the power bypass switch to operate through the power bypass drive unit.

[0017] The power system according to the embodiment of the present invention has at least the following beneficial effects:

[0018] In the power system of the present invention, when the main power supply is normally supplied, the control module controls the power unit to operate normally, and can control the power bypass drive unit to control the power bypass switch to bypass when it needs to be cut off, and the first power module and the second power module can both draw power from the power unit, and the first power module can supply power to the power bypass drive unit. The power unit operates normally. At this time, the voltage detection module detects that the voltage of the power unit is stable, so the control power bypass switch is closed, and the input end of the second power module is bypassed. The second power module does not need to supply power to the control module. When the main power supply fails, the voltage of the power unit increases abnormally, and the first power module can still supply power to the power bypass drive unit .... When the voltage increases, the control power bypass switch is disconnected, and the second power module supplies power to the control module and is triggered. The control module drives the power bypass switch to close and self-lock through the power bypass drive unit, so that the input end of the power module is bypassed and stops operating, which will not affect the normal operation of other power modules. When the power module stops operating, the first power module and the second power module will lose power input and will also suspend operation. This design provides backup protection for the operation of the power unit. When the main power supply fails, it provides power supply support for effective bypass, and uses voltage detection to control the operation of the second power module to prevent multiple power supplies from supplying power to the control module and causing power supply disorder, and the operation of related modules can be automatically stopped after the power unit is bypassed.

[0019] According to some embodiments of the present invention, the power unit also includes a first discharge resistor Rup and a second discharge resistor Rdown, one end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit, one pole of the input end of the first power module, and one pole of the detection end of the voltage detection module, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module and one end of the second discharge resistor Rdown, the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit, the other pole of the input end of the first power module, the other pole of the detection end of the voltage detection module, and the other pole of the input end of the second power module.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 A schematic block diagram of the principle structure of one embodiment of a power unit backup power supply circuit of the present invention;

[0023] Figure 2 A circuit diagram of a first power supply module of one embodiment of a power unit backup power supply circuit of the present invention;

[0024] Figure 3 A circuit diagram of a second power supply module of one embodiment of a power unit backup power supply circuit of the present invention;

[0025] Figure 4 A circuit diagram of a voltage detection module of one embodiment of a power unit backup power supply circuit of the present invention;

[0026] Figure 5 The figure is a schematic block diagram of the principle structure of one embodiment of the power system of the present invention.

[0027] Reference numerals:

[0028] A first power module 100, a second power module 200, a power bypass switch 300, a voltage detection module 400, a comparison unit 410, a power bypass drive unit 420, a signal acquisition unit 430, a power unit 500, a power bypass switch 600, a power bypass drive unit 700, and a control module 800. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside” and “outside”, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1 - Figure 4 As shown, a backup power supply circuit for a power unit 500 includes a first power module 100, a second power module 200, a power bypass switch 300 and a voltage detection module 400. The input end of the first power module 100 is connected to the power unit 500 to obtain power, the output end of the first power module 100 is connected to a power bypass driving unit 700 that drives a power bypass switch 600 of the power unit 500 to operate so as to supply power to the power bypass driving unit 700, the input end of the second power module 200 is connected to the power unit 500 to obtain power, the output end of the second power module 200 is connected to a control module 800 that controls the operation of the power bypass driving unit 700 to supply power to the control module 800, the power bypass switch 300 is connected in parallel with the input end of the second power module 200, the detection end of the voltage detection module 400 is connected to the power unit 500, and the output end of the voltage detection module 400 is connected to the power bypass switch 300 to drive the power bypass switch 300 to operate according to a detection signal.

[0034] In the backup power supply circuit of the power unit 500 of the present invention, both the first power module 100 and the second power module 200 can draw power from the power unit 500, the first power module 100 can supply power to the power bypass drive unit 700, and the power unit 500 operates normally. At this time, the voltage detection module 400 detects that the voltage of the power unit 500 is stable, so the control power bypass switch 300 is closed, and the input end of the second power module 200 is bypassed. The second power module 200 does not need to supply power to the control module 800. When the main power supply fails, the voltage of the power unit 500 increases abnormally, and the first power module 100 can still supply power to the power bypass drive unit 700. At this time, the voltage detection module 400 detects that the voltage of the power unit 500 increases, so the control power bypass switch 300 is disconnected, and the second power module 200 is the control module 800. Power is supplied and triggered, and the control module 800 drives the power bypass switch 600 to close and self-lock through the power bypass drive unit 700, so that the input end of the power module is bypassed and stops operating, which will not affect the normal operation of other power modules. When the power module stops operating, the first power supply module 100 and the second power supply module 200 will lose power input and will also suspend operation. This design provides backup protection for the operation of the power unit 500. When the main power supply fails, it provides power supply support for effective bypass, and uses voltage detection to control the operation of the second power supply module 200 to prevent multiple power supplies from supplying power to the control module 800 and causing power supply disorder. It can also avoid repeated starting of the second power supply module 200 under low voltage conditions, reduce power loss, and improve reliability. After the power unit 500 is bypassed, the operation of related modules can be automatically stopped.

[0035] Among them, Figure 1 As shown, in some embodiments of the present invention, a first discharge resistor Rup and a second discharge resistor Rdown are further included; one end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit 500, one pole of the input end of the first power module 100, and one pole of the detection end of the voltage detection module 400, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module 200 and one end of the second discharge resistor Rdown, and the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit 500, the other pole of the input end of the first power module 100, the other pole of the detection end of the voltage detection module 400, and the other pole of the input end of the second power module 200.

[0036] In some embodiments of the present invention, the first power module and the second power module are linear power supplies, switching power supplies or voltage stabilizing circuits. Further, the first power module 100 is a linear power supply, and the second power module 200 is a switching isolation power supply.

[0037] This design uses two discharge resistors in series to divide the voltage and extract energy, which reduces the input voltage requirement of the isolating switch power supply, makes it easier to select the specifications of the isolating switch power supply, is easy to design, has a simple structure, and at the same time, reduces the withstand voltage requirements for the controllable switches and energy storage capacitors in the internal components, making device selection easy.

[0038] A linear power supply and a switch isolation power supply are used to respectively power the power bypass drive unit 700 and the control module 800, outputting two stable power supplies, distinguishing different voltage levels, and distinguishing the load's requirements for power supply voltage accuracy, making the load operation more stable.

[0039] In some embodiments of the present invention, the first power module 100 includes a switch tube Q7, a voltage regulator tube D4, a voltage regulator tube D5, a diode D3, a resistor R8, a resistor R9 and a capacitor C3; one end of the resistor R8 is respectively connected to the input end of the switch tube Q7 and the positive electrode of the DC end of the power unit 500, the other end of the resistor R8 is respectively connected to the control electrode of the switch tube Q7, the cathode of the voltage regulator tube D4 and the cathode of the voltage regulator tube D5, the output electrode of the switch tube Q7 is respectively connected to the anode of the voltage regulator tube D5 and the anode of the diode D3, the cathode of the diode D3 is connected to one end of the resistor R9, the other end of R9 is respectively connected to one end of the capacitor C3 and one electrode of the power bypass drive unit 700, the anode of the voltage regulator tube D4 is respectively connected to the other end of the capacitor C3, the other electrode of the power bypass drive unit 700 and the negative electrode of the DC end of the power unit 500.

[0040] In some embodiments of the present invention, the second power supply module 200 includes an anti-backflow diode D2, a capacitor C1, a DC-DC converter, a capacitor C2, a voltage regulator D1 and a resistor R6. The anode of the anti-backflow diode D2 is connected to the other end of the first discharge resistor Rup, the cathode of the anti-backflow diode D2 is respectively connected to one end of the capacitor C1 and the positive electrode of the DC-DC converter input end, the positive electrode of the DC-DC converter output end is respectively connected to one end of the capacitor C2, the cathode of the voltage regulator D1, one end of the resistor R6 and the control module 800, the negative electrode of the DC-DC converter output end, the other end of the capacitor C2, the anode of the voltage regulator D1, and the other end of the resistor R6 are all grounded, and the negative electrode of the DC-DC converter input end is respectively connected to the other end of the capacitor C1 and the negative electrode of the DC end of the power unit 500.

[0041] Among them, the DC-DC converter is one of the switching power supply topologies such as flyback, forward, push-pull, half-bridge, and full-bridge.

[0042] In some embodiments of the present invention, the voltage detection module 400 includes a comparison unit 410 and a power bypass driving unit 420. The comparison unit 410 is connected to the power unit 500 to obtain a detection signal and compare it. The power bypass driving unit 420 is respectively connected to the comparison unit 410 and the power bypass switch 300 to drive the power bypass switch 300 to operate according to a control signal formed by the comparison.

[0043] When the power unit 500 operates normally, the output voltage is lower than the judgment value preset in the comparison unit 410, so that the power bypass drive unit 420 drives the power bypass switch 300 to close, and the input end of the second power module 200 is bypassed. When a fault occurs, the voltage output by the power unit 500 rises and is higher than the judgment value of the comparison unit 410, the power bypass drive unit 420 drives the power bypass switch 300 to open, and the second power module 200 is put into use.

[0044] In some embodiments of the present invention, the voltage detection module 400 further includes a signal acquisition unit 430 , which is connected to the power unit 500 and the comparison unit 410 respectively to acquire a detection signal and output it to the comparison unit 410 .

[0045] Specifically, the signal acquisition unit 430 includes a resistor R3 and a resistor R5, and the comparison unit 410 includes an adjustable reference source U2, a resistor R1 and a voltage regulator D7; one end of the resistor R5 is connected to the positive electrode of the DC end of the power unit 500, and the other end of the resistor R5 is respectively connected to one end of the resistor R3 and the reference electrode of the adjustable reference source U2, the negative electrode of the adjustable reference source U2 is respectively connected to one end of the resistor R1, the cathode of the voltage regulator D7 and the power bypass drive unit 420, the other end of the resistor R1 is connected to the output end of the first power module 100, and the anode of the adjustable reference source U2 is respectively connected to the anode of the voltage regulator D7, the other end of the resistor R3 and the negative electrode of the DC end of the power unit 500.

[0046] The power bypass switch 300 is a switch tube S1, and the power bypass driving unit 420 includes a voltage regulator tube D8 and a resistor R7. The cathode of the voltage regulator tube D8 is connected to the cathode of the voltage regulator tube D7, and the anode of the voltage regulator tube D8 is respectively connected to one end of the resistor R7 and the control electrode of the switch tube S1. The input electrode of the switch tube S1 is connected to the positive electrode of the input end of the second power module 200, and the output electrode of the switch tube S1 is respectively connected to the other end of the resistor R7 and the negative electrode of the output end of the DC-DC converter.

[0047] In some embodiments of the present invention, a resistor R2, a voltage regulator tube D6, a switch tube Q3 and a resistor R4 are also included; one end of the resistor R2 is connected to the negative electrode of the adjustable reference source U2, the other end of the resistor R2 is connected to the cathode of the voltage regulator tube D6, the anode of the voltage regulator tube D6 is connected to the control electrode of the switch tube Q3, the input electrode of the switch tube Q3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3, and the output electrode of the switch tube Q3 is electrically connected to the other end of the resistor R3.

[0048] When the power unit 500 is operating normally, the detection signal input is performed through the voltage division detection of the resistors R3 and R5, and the output voltage of the adjustable reference source U2 is controlled. The judgment value of the comparison unit 410 is a virtual value that can drive the Zener diode D8 to turn on, which is equivalent to a virtual setting at the connection node of the negative electrode of the adjustable reference source U2, the cathode of the Zener diode D7, and the cathode of the Zener diode D8. At this time, the node voltage of the negative electrode of the adjustable reference source U2 is higher, the Zener diode D8 is turned on, thereby driving the switch tube S1 to turn on, and the Zener diode D6 can also be turned on, and the switch tube Q3 is turned on, so that the resistor R4 is connected in parallel with the resistor R3, thereby increasing the trigger value of the external voltage, so that when the voltage detected by the signal acquisition unit 430 fluctuates, it will not cause false triggering.

[0049] When the external voltage gradually rises to a certain level, the node voltage of the negative electrode of the adjustable reference source U2 drops, which is not enough to turn on the Zener diodes D8 and D6, so the switch tube Q3 is turned off, and the switch tube S1 is also turned off.

[0050] In some embodiments of the present invention, the switch tube Q7, the switch tube Q3, and the switch tube S1 may be any one of a MOS tube, an IGBT, and a triode.

[0051] According to a power system of an embodiment of the second aspect of the present invention, Figure 5 As shown, it includes a power unit 500, a power bypass switch 600, a power bypass drive unit 700, a control module 800 and a backup power supply circuit for the power unit 500 disclosed in any of the above embodiments, the power bypass switch 600 is connected in parallel with the AC end of the power unit 500, the control module 800 is connected to the power unit 500 to control the operation of the power unit 500, the input end of the first power module 100 is connected to the DC end of the power unit 500 to obtain power, the output end of the first power module 100 is connected to the power bypass drive unit 700 to supply power to the power bypass drive unit 700, the input end of the second power module 200 is connected to the DC end of the power unit 500 to obtain power, the output end of the second power module 200 is connected to the control module 800 to supply power to the control module 800, and the control module 800 is connected to the power bypass drive unit 700 to drive the power bypass switch 600 to operate through the power bypass drive unit 700.

[0052] Among them, the power unit 500 can be a half-bridge or full-bridge sub-module, the control module 800 can be composed of a chip with logic processing functions such as a CPU and auxiliary circuits, the electrical system can include multiple power units 500, and the AC ends of the multiple power units 500 are connected end to end in sequence to form a bridge arm, and each phase in the three-phase system can be composed of an upper and lower bridge arm, and the power bypass switch 600 has a closed self-locking function, the power bypass drive unit 700 can be composed of a relay, the main power supply and the first power supply module 100 can both supply power to the power bypass drive unit 700, and there is also a switch component connected in series, and the control module 800 controls the on and off of the switch component to control the on and off of the power bypass switch 600.

[0053] In the power system of the present invention, when the main power supply is normal, the control module 800 controls the power unit 500 to operate normally, and can control the power bypass drive unit 700 to control the power bypass switch 600 to bypass when it needs to be cut off, and the first power module 100 and the second power module 200 can both draw power from the power unit 500, the first power module 100 can supply power to the power bypass drive unit 700, and the power unit 500 operates normally. At this time, the voltage detection module 400 detects that the voltage of the power unit 500 is stable, so the control power bypass switch 300 is closed, and the input end of the second power module 200 is bypassed. The second power module 200 does not need to supply power to the control module 800. When the main power supply fails, the voltage of the power unit 500 increases abnormally, and the first power module 100 can still supply power to the power bypass drive unit 700. At this time, the voltage detection module 400 detects that the voltage of the power unit 500 is stable, so the control power bypass switch 300 is closed, and the input end of the second power module 200 is bypassed. The second power module 200 does not need to supply power to the control module 800. When the main power supply fails, the voltage of the power unit 500 increases abnormally, and the first power module 100 can still supply power to the power bypass drive unit 700. When block 400 detects that the voltage of the power unit 500 increases, the control power bypass switch 300 is disconnected, and the second power module 200 supplies power to the control module 800 and is triggered. The control module 800 drives the power bypass switch 600 to be closed and self-locked through the power bypass drive unit 700, so that the input end of the power module is bypassed and stops operating, which will not affect the normal operation of other power modules. When the power module stops operating, the first power module 100 and the second power module 200 will lose power input and will also suspend operation. This design provides backup protection for the operation of the power unit 500. When the main power supply fails, it provides power supply support for effective bypass, and uses voltage detection to control the operation of the second power module 200 to prevent multiple power supplies from supplying power to the control module 800 and causing power supply disorder, and the operation of related modules can be automatically stopped after the power unit 500 is bypassed.

[0054] In some embodiments of the present invention, the first discharge resistor Rup and the second discharge resistor Rdown may be integrated on the power unit 500, one end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit 500, one pole of the input end of the first power module 100, and one pole of the detection end of the voltage detection module 400, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module 200 and one end of the second discharge resistor Rdown, the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit 500, the other pole of the input end of the first power module 100, the other pole of the detection end of the voltage detection module 400, and the other pole of the input end of the second power module 200. The discharge resistor provided by the power unit 500 is used, and no new devices are required, which has good economy, and can reduce the volume of the power supply and reduce the weight of the power supply.

[0055] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A power unit backup power supply circuit, It is characterized in that include: A first power supply module, wherein an input end of the first power supply module is connected to the power unit to obtain power, and an output end of the first power supply module is connected to a power bypass driving unit that drives a power bypass switch of the power unit to supply power to the power bypass driving unit; A second power supply module, wherein an input end of the second power supply module is connected to the power unit to obtain power, and an output end of the second power supply module is connected to a control module that controls the operation of the power bypass drive unit to supply power to the control module; A power bypass switch, the power bypass switch is connected in parallel with an input end of the second power module; A voltage detection module, wherein a detection end of the voltage detection module is connected to the power unit, and an output end of the voltage detection module is connected to the power bypass switch to drive the power bypass switch to operate according to a detection signal; The voltage detection module includes a comparison unit and a power bypass driving unit, wherein the comparison unit is connected to the power unit to obtain a detection signal and compare it, and the power bypass driving unit is respectively connected to the comparison unit and the power bypass switch to drive the power bypass switch to operate according to a control signal formed by comparison; The voltage detection module further includes a signal acquisition unit, which is connected to the power unit and the comparison unit respectively to acquire a detection signal and output it to the comparison unit; The signal acquisition unit includes a resistor R3 and a resistor R5, and the comparison unit includes an adjustable reference source U2, a resistor R1 and a voltage regulator tube D7; One end of the resistor R5 is connected to the positive electrode of the DC end of the power unit, the other end of the resistor R5 is respectively connected to one end of the resistor R3 and the reference electrode of the adjustable reference source U2, the negative electrode of the adjustable reference source U2 is respectively connected to one end of the resistor R1, the cathode of the voltage regulator D7 and the power bypass drive unit, the other end of the resistor R1 is connected to the output end of the first power module, and the anode of the adjustable reference source U2 is respectively connected to the anode of the voltage regulator D7, the other end of the resistor R3 and the negative electrode of the DC end of the power unit.

2. A power unit backup power supply circuit according to claim 1, Features: It also includes a resistor R2, a voltage regulator tube D6, a switch tube Q3 and a resistor R4; One end of the resistor R2 is connected to the negative electrode of the adjustable reference source U2, the other end of the resistor R2 is connected to the cathode of the voltage regulator tube D6, the anode of the voltage regulator tube D6 is connected to the control electrode of the switch tube Q3, the input electrode of the switch tube Q3 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to one end of the resistor R3, and the output electrode of the switch tube Q3 is electrically connected to the other end of the resistor R3.

3. A power unit backup power supply circuit according to claim 1, Features: The first power supply module and the second power supply module are linear power supplies, switching power supplies or voltage stabilizing circuits.

4. A power unit backup power supply circuit according to claim 3, Features: The first power module includes a switch tube Q7, a voltage regulator tube D4, a voltage regulator tube D5, a diode D3, a resistor R8, a resistor R9 and a capacitor C3; One end of the resistor R8 is respectively connected to the input end of the switch tube Q7 and the positive electrode of the DC end of the power unit, the other end of the resistor R8 is respectively connected to the control electrode of the switch tube Q7, the cathode of the voltage regulator tube D4 and the cathode of the voltage regulator tube D5, the output electrode of the switch tube Q7 is respectively connected to the anode of the voltage regulator tube D5 and the anode of the diode D3, the cathode of the diode D3 is connected to one end of the resistor R9, the other end of the resistor R9 is respectively connected to one end of the capacitor C3 and one electrode of the power bypass drive unit, the anode of the voltage regulator tube D4 is respectively connected to the other end of the capacitor C3, the other electrode of the power bypass drive unit and the negative electrode of the DC end of the power unit.

5. A power unit backup power supply circuit according to claim 1, Features: Also includes a first discharge resistor Rup and a second discharge resistor Rdown; One end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit, one pole of the input end of the first power module, and one pole of the detection end of the voltage detection module, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module and one end of the second discharge resistor Rdown, and the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit, the other pole of the input end of the first power module, the other pole of the detection end of the voltage detection module, and the other pole of the input end of the second power module.

6. A power system, It is characterized in that It includes a power unit, a power bypass switch, a power bypass drive unit, a control module and a power unit backup power supply circuit as described in any one of claims 1 to 5, the power bypass switch is connected in parallel with the AC end of the power unit, the control module is connected to the power unit to control the operation of the power unit, the input end of the first power module is connected to the DC end of the power unit to obtain power, the output end of the first power module is connected to the power bypass drive unit to supply power to the power bypass drive unit, the input end of the second power module is connected to the DC end of the power unit to obtain power, the output end of the second power module is connected to the control module to supply power to the control module, and the control module is connected to the power bypass drive unit to drive the power bypass switch to operate through the power bypass drive unit.

7. The power system according to claim 6, Features: The power unit also includes a first discharge resistor Rup and a second discharge resistor Rdown, one end of the first discharge resistor Rup is respectively connected to the positive pole of the DC end of the power unit, one pole of the input end of the first power module, and one pole of the detection end of the voltage detection module, the other end of the first discharge resistor Rup is respectively connected to one pole of the input end of the second power module and one end of the second discharge resistor Rdown, and the other end of the second discharge resistor Rdown is respectively connected to the negative pole of the DC end of the power unit, the other pole of the input end of the first power module, the other pole of the detection end of the voltage detection module, and the other pole of the input end of the second power module.

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