Standby power supply device for energy storage super capacitor of voltage monitoring circuit

Abstract

The invention discloses an energy storage super capacitor standby power supply device of a voltage monitoring circuit. The standby power supply device for the energy storage super capacitor of the voltage monitoring circuit comprises a switching power supply, a voltage monitoring module and an energy storage super capacitor module, the switching power supply is electrically connected with the voltage monitoring module and the energy storage super capacitor module respectively, the voltage monitoring module is electrically connected with the energy storage super capacitor module, and the voltage monitoring module is electrically connected with three-phase input of a monitored electric appliance; the switching power supply is used for rectifying accessed alternating current into direct current and respectively outputting the direct current to the voltage monitoring module and the energy storage super capacitor module; the voltage monitoring module is used for monitoring the three-phase input voltage of the monitored electric appliance; and the energy storage super capacitor module is used for supplying standby power to the voltage monitoring module when the switching power supply cuts off the direct current input to the voltage monitoring module. According to the invention, standby power supply switching can be rapidly carried out on the voltage monitoring circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of control circuit power supply protection equipment, and in particular relates to an energy storage supercapacitor backup power supply device for a voltage monitoring circuit. Background Art

[0002] For electrical appliances that require the use of voltage monitoring circuits, especially escalators, which require monitoring of whether the escalator system is powered off, it is necessary to set up an additional backup power supply device for the voltage monitoring circuit as a safety measure.

[0003] In the prior art, the backup power supply device of the voltage monitoring circuit is often complex in structure and has high economic cost. At the same time, there is a problem of untimely power switching, which easily causes safety hazards. Summary of the invention

[0004] In order to overcome the defects and shortcomings of the prior art, an object of the present invention is to provide an energy storage supercapacitor backup power supply device for a voltage monitoring circuit, which is used to quickly switch the backup power supply of the voltage monitoring circuit.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: An energy storage super capacitor backup power supply device for a voltage monitoring circuit, comprising a switching power supply, a voltage monitoring module, and an energy storage super capacitor module; The switch power supply is electrically connected to the voltage monitoring module and the energy storage super capacitor module respectively, the voltage monitoring module is electrically connected to the energy storage super capacitor module, and the voltage monitoring module is electrically connected to the three-phase input of the monitored electrical appliance; The switching power supply is used to rectify the incoming AC power into DC power and output it to the voltage monitoring module and the energy storage super capacitor module respectively; The voltage monitoring module is used to monitor the voltage of the three-phase input of the monitored electrical appliance; The energy storage supercapacitor module is used to provide backup power supply to the voltage monitoring module when the switching power supply disconnects the DC power input to the voltage monitoring module.

[0006] Preferably, the energy storage supercapacitor module includes an automatic switching circuit and at least one supercapacitor RC circuit; The automatic switching circuit is electrically connected to the supercapacitor RC circuit, the switching power supply, and the voltage monitoring module respectively; The automatic switching circuit is used to charge the supercapacitor RC circuit by connecting to the DC output terminal of the switching power supply when the switching power supply supplies power to the voltage monitoring module; The automatic switching circuit is also used to automatically switch to the super capacitor RC circuit for discharging to supply power to the voltage monitoring module when the switching power supply cuts off the power to the voltage monitoring module.

[0007] Further, the automatic switching circuit includes a first constant current diode, a second constant current diode, and a first voltage balancing resistor; The positive electrode of the first constant current diode is electrically connected to the positive electrode P24V of the DC output end of the switching power supply, and the negative electrode of the first constant current diode is electrically connected to the negative electrode 24V of the DC output end of the switching power supply and one end of the first voltage equalizing resistor respectively; The cathode of the second constant current diode is connected to the 24V cathode of the DC output end of the switching power supply, and the anode of the second constant current diode is electrically connected to the other end of the first voltage balancing resistor; The other end of the first voltage balancing resistor is electrically connected to the supercapacitor RC circuit.

[0008] Further, the supercapacitor RC circuit includes a second voltage-equalizing resistor and a first supercapacitor; The second voltage balancing resistor is connected in parallel with the first super capacitor; The positive electrode of the first super capacitor is electrically connected to the other end of the first voltage-equalizing resistor, and the negative electrode of the first super capacitor is grounded or electrically connected to another super capacitor RC circuit.

[0009] Furthermore, six supercapacitor RC circuits are provided, and the six supercapacitor RC circuits are connected in series in sequence, and the negative electrode of the supercapacitor of the sixth supercapacitor RC circuit is grounded.

[0010] Further, the six supercapacitor RC circuits include a first supercapacitor, a second supercapacitor, a third supercapacitor, a fourth supercapacitor, a fifth supercapacitor, a sixth supercapacitor, a second balancing resistor, a third balancing resistor, a fourth balancing resistor, a fifth balancing resistor, a sixth balancing resistor, and a seventh balancing resistor; The first super capacitor is connected in parallel with the second balancing resistor, the second super capacitor is connected in parallel with the third balancing resistor, the third super capacitor is connected in parallel with the fourth balancing resistor, the fourth super capacitor is connected in parallel with the fifth balancing resistor, the fifth super capacitor is connected in parallel with the sixth balancing resistor, and the sixth super capacitor is connected in parallel with the seventh balancing resistor; The positive electrode of the first supercapacitor is electrically connected to the other end of the first equalizing resistor, the positive electrode of the second supercapacitor is electrically connected to the negative electrode of the first supercapacitor, the positive electrode of the third supercapacitor is electrically connected to the negative electrode of the second supercapacitor, the positive electrode of the fourth supercapacitor is electrically connected to the negative electrode of the third supercapacitor, the positive electrode of the fifth supercapacitor is electrically connected to the negative electrode of the fourth supercapacitor, the positive electrode of the sixth supercapacitor is electrically connected to the negative electrode of the fifth supercapacitor, and the negative electrode of the sixth supercapacitor is grounded.

[0011] Furthermore, the voltage monitoring module includes a step-down circuit, a voltage measurement module, and a working power supply circuit; The step-down circuit and the working power supply circuit are electrically connected to the voltage measurement module respectively, the step-down circuit is electrically connected to the three-phase input of the monitored electrical appliance, and the working power supply circuit is electrically connected to the switching power supply and the automatic switching circuit respectively; The step-down circuit is used to step down the voltage after being connected to the three-phase input of the monitored electrical appliance; The working power supply circuit is used to input a DC power supply from a switching power supply or an energy storage super capacitor module to the voltage measurement module; The voltage measurement module is a voltage measurement chip used to measure the input voltage of the monitored electrical appliance.

[0012] Further, the step-down circuit includes a first step-down transformer, a second step-down transformer, an eighth balancing resistor, a ninth balancing resistor, a tenth balancing resistor, and an eleventh balancing resistor; One end of the eighth balancing resistor is electrically connected to the R phase of the three-phase input of the monitored electrical appliance, and the other end of the eighth balancing resistor is electrically connected to one end of the primary side of the first step-down transformer; One end of the ninth balancing resistor is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the ninth balancing resistor is electrically connected to the other end of the primary side of the first step-down transformer; One end of the tenth voltage-equalizing resistor is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the tenth voltage-equalizing resistor is electrically connected to one end of the primary side of the second step-down transformer; One end of the eleventh voltage-equalizing resistor is electrically connected to the T phase of the three-phase input of the monitored electrical appliance, and the other end of the eleventh voltage-equalizing resistor is electrically connected to the other end of the primary side of the second step-down transformer; One end of the secondary side of the first step-down transformer is electrically connected to a measurement pin of the voltage measurement chip; The other end of the secondary side of the first step-down transformer is electrically connected to one end of the secondary side of the second step-down transformer, and then electrically connected to another measurement pin of the voltage measurement chip; The other end of the secondary side of the second step-down transformer is electrically connected to another measurement pin of the voltage measurement chip.

[0013] Further, the working power supply circuit includes a twelfth voltage-equalizing resistor and a voltage-limiting capacitor; One end of the twelfth voltage-equalizing resistor is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and the power supply pin of the voltage measurement chip, respectively, and the other end of the twelfth voltage-equalizing resistor is grounded; One end of the voltage-limiting capacitor is electrically connected to the 24V negative pole of the DC output end of the switching power supply and the power supply pin of the voltage measurement chip, respectively, and the other end of the voltage-limiting capacitor is grounded.

[0014] Further, the switching power supply includes a third step-down transformer, a rectifier bridge, and a filter capacitor; The primary side of the third step-down transformer is connected to the external AC power supply, and the secondary side of the third step-down transformer is electrically connected to the input end of the rectifier bridge; A filter capacitor is connected in parallel to the output end of the rectifier bridge, and the two ends of the filter capacitor are respectively the P24V positive pole and the 24V negative pole of the DC output end of the switching power supply.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: In view of the possibility that the switching power supply used in the voltage monitoring circuit may be powered off at any time or randomly, the present invention can realize that when the switching power supply is powered off, the energy storage supercapacitor module quickly and seamlessly switches to power the voltage monitoring circuit, thereby stably supporting the normal operation of the voltage monitoring circuit and providing a guarantee basis for the safe operation of the monitored electrical appliances. The circuit structure design of the device is simple, the overall stability of the device is high, the economic cost is low, and it has the advantage of wide application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the energy storage supercapacitor backup power supply device of the voltage monitoring circuit of the present invention; Figure 2 for Figure 1 Circuit diagram of the switching power supply module; Figure 3 for Figure 1 Circuit diagram of the medium voltage monitoring module; Figure 4 for Figure 1 Circuit diagram of the energy storage supercapacitor module. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] It should be noted that the directions or positional relationships indicated by terms such as “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present disclosure and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present disclosure.

[0019] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. Similarly, words such as "one", "an", or "the" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "electrically connected" or "connected" and the like are not limited to physical or mechanical electrical connections, but may include electrical connections, whether direct or indirect. Example

[0020] like Figure 1-4 This embodiment provides an energy storage super capacitor backup power supply device for a voltage monitoring circuit, comprising a switching power supply, a voltage monitoring module, and an energy storage super capacitor module.

[0021] like Figure 1 The switch power supply is electrically connected to the voltage monitoring module and the energy storage super capacitor module respectively, the voltage monitoring module is electrically connected to the energy storage super capacitor module, and the voltage monitoring module is electrically connected to the three-phase input of the monitored electrical appliance.

[0022] The switching power supply is used to rectify the incoming AC power into DC power and output it to the voltage monitoring module and the energy storage super capacitor module respectively. The voltage monitoring module is used to monitor the voltage of the three-phase input of the monitored electrical appliance. The energy storage super capacitor module is used to provide backup power to the voltage monitoring module when the switching power supply disconnects the DC power input to the voltage monitoring module.

[0023] like Figure 4 As shown in FIG. 1 , the energy storage supercapacitor module includes an automatic switching circuit and six supercapacitor RC circuits.

[0024] The automatic switching circuit is electrically connected to the supercapacitor RC circuit, the switching power supply, and the voltage monitoring module respectively. The automatic switching circuit is used to charge the supercapacitor RC circuit by connecting to the DC output terminal of the switching power supply when the switching power supply supplies power to the voltage monitoring module. The automatic switching circuit is also used to automatically switch to the supercapacitor RC circuit for discharging to supply power to the voltage monitoring module when the switching power supply cuts off the power to the voltage monitoring module.

[0025] The automatic switching circuit includes a first constant current diode D1, a second constant current diode D2, and a first equalizing resistor R1. The positive electrode of the first constant current diode D1 is electrically connected to the P24V positive electrode of the DC output end of the switching power supply, and the negative electrode of the first constant current diode D1 is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and one end of the first equalizing resistor R1. The negative electrode of the second constant current diode D2 is connected to the 24V negative electrode of the DC output end of the switching power supply, and the positive electrode of the second constant current diode D2 is electrically connected to the other end of the first equalizing resistor R1; the other end of the first equalizing resistor R1 is electrically connected to the supercapacitor RC circuit.

[0026] Each supercapacitor RC circuit includes a voltage-equalizing resistor and a supercapacitor; the voltage-equalizing resistor is connected in parallel with the supercapacitor.

[0027] The six supercapacitor RC circuits are connected in series in sequence. The six supercapacitor RC circuits include a first supercapacitor C1, a second supercapacitor C2, a third supercapacitor C3, a fourth supercapacitor C4, a fifth supercapacitor C5, a sixth supercapacitor C6, a second equalizing resistor R2, a third equalizing resistor R3, a fourth equalizing resistor R4, a fifth equalizing resistor R5, a sixth equalizing resistor R6, and a seventh equalizing resistor R7.

[0028] The first super capacitor C1 is connected in parallel with the second equalizing resistor R2, the second super capacitor C2 is connected in parallel with the third equalizing resistor R3, the third super capacitor C3 is connected in parallel with the fourth equalizing resistor R4, the fourth super capacitor C4 is connected in parallel with the fifth equalizing resistor R5, the fifth super capacitor C5 is connected in parallel with the sixth equalizing resistor R6, and the sixth super capacitor C6 is connected in parallel with the seventh equalizing resistor R7.

[0029] In this embodiment, preferably, the first super capacitor C1, the second super capacitor C2, the third super capacitor C3, the fourth super capacitor C4, the fifth super capacitor C5, and the sixth super capacitor C6 are of the same specifications, and the second equalizing resistor R2, the third equalizing resistor R3, the fourth equalizing resistor R4, the fifth equalizing resistor R5, the sixth equalizing resistor R6, and the seventh equalizing resistor R7 are of the same specifications.

[0030] The positive electrode of the first super capacitor C1 is electrically connected to the other end of the first equalizing resistor R1, the positive electrode of the second super capacitor C2 is electrically connected to the negative electrode of the first super capacitor C1, the positive electrode of the third super capacitor C3 is electrically connected to the negative electrode of the second super capacitor C2, the positive electrode of the fourth super capacitor C4 is electrically connected to the negative electrode of the third super capacitor C3, the positive electrode of the fifth super capacitor C5 is electrically connected to the negative electrode of the fourth super capacitor C4, the positive electrode of the sixth super capacitor C6 is electrically connected to the negative electrode of the fifth super capacitor C5, and the negative electrode of the sixth super capacitor C6 is grounded.

[0031] like Figure 3As shown. The voltage monitoring module includes a step-down circuit, a voltage measurement module, and a working power supply circuit. The step-down circuit and the working power supply circuit are electrically connected to the voltage measurement module respectively, the step-down circuit is electrically connected to the three-phase input of the monitored electrical appliance, and the working power supply circuit is electrically connected to the switching power supply and the automatic switching circuit respectively. The step-down circuit is used to step down the voltage after accessing the three-phase input of the monitored electrical appliance. The working power supply circuit is used to input a DC power supply from a switching power supply or an energy storage supercapacitor module to the voltage measurement module. The voltage measurement module is a voltage measurement chip, which is used to measure the input voltage of the monitored electrical appliance. In this embodiment, the specific model of the voltage measurement chip is preferably an ADE7880 chip.

[0032] The step-down circuit includes a first step-down transformer T1, a second step-down transformer T2, an eighth balancing resistor R8, a ninth balancing resistor R9, a tenth balancing resistor R10, and an eleventh balancing resistor R11.

[0033] One end (input phase L1) of the eighth equalizing resistor R8 is electrically connected to the R phase of the three-phase input of the monitored electrical appliance, and the other end of the eighth equalizing resistor R8 is electrically connected to one end of the primary side of the first step-down transformer T1; one end (input phase L2) of the ninth equalizing resistor R9 is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the ninth equalizing resistor R9 is electrically connected to the other end of the primary side of the first step-down transformer T1; one end (input phase L2) of the tenth equalizing resistor R10 is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the tenth equalizing resistor R10 is electrically connected to one end of the primary side of the second step-down transformer T2; one end (input phase L3) of the eleventh equalizing resistor R11 is electrically connected to the T phase of the three-phase input of the monitored electrical appliance, and the other end of the eleventh equalizing resistor R11 is electrically connected to the other end of the primary side of the second step-down transformer T2.

[0034] One end of the secondary side of the first step-down transformer T1 (output phase U) is electrically connected to a measurement pin VAP of the voltage measurement chip ADE7880; the other end of the secondary side of the first step-down transformer T1 is electrically connected to one end of the secondary side of the second step-down transformer T2 (output phase V), and then electrically connected to another measurement pin VBP of the voltage measurement chip ADE7880; the other end of the secondary side of the second step-down transformer T2 (output phase W) is electrically connected to another measurement pin VCP of the voltage measurement chip ADE7880.

[0035] The working power supply circuit includes a twelfth voltage-equalizing resistor R12 and a voltage-limiting capacitor C7.

[0036] One end (N end) of the twelfth voltage-equalizing resistor R12 is electrically connected to the 24V negative electrode of the DC output end of the switching power supply, the negative electrode of the second constant current diode D2 in the switching circuit, and the power supply pin of the voltage measurement chip, respectively, and the other end of the twelfth voltage-equalizing resistor R12 is grounded; one end (N end) of the voltage-limiting capacitor C7 is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and the power supply pin of the voltage measurement chip, respectively, and the other end of the voltage-limiting capacitor C7 is grounded.

[0037] like Figure 2 The switching power supply includes a third step-down transformer T3, a rectifier bridge, and a filter capacitor C8.

[0038] The primary side of the third step-down transformer T3 is connected to the external AC power supply, and the secondary side of the third step-down transformer T3 is electrically connected to the input end of the rectifier bridge; the output end of the rectifier bridge is connected in parallel with the filter capacitor C8, and the two ends of the filter capacitor C8 are respectively the P24V positive pole and the 24V negative pole of the DC output end of the switching power supply.

[0039] The operation process of this embodiment is as follows: when the switching power supply supplies power to the voltage monitoring module normally, the voltage monitoring module can correctly measure the three-phase voltage of the monitored electrical appliance from the three phases R, S, and T. At the same time, the switching power supply charges the six supercapacitor RC circuits through the first constant current diode D1 of the automatic switching circuit until the capacity of the six supercapacitors reaches a stable state; when the switching power supply cannot supply power to the voltage monitoring module normally, that is, a power-off state occurs, the automatic switching circuit outputs direct current to the outside through the second constant current diode D2, that is, the six supercapacitors are discharged and output to the working power circuit of the voltage monitoring module, so that the voltage monitoring module can continue to perform voltage monitoring work normally.

[0040] Compared with the prior art, this embodiment has the following beneficial effects: In view of the possibility that the switching power supply used by the voltage monitoring circuit may be powered off at any time or randomly, this embodiment can realize that when the switching power supply is powered off, the energy storage supercapacitor module quickly and seamlessly switches to power the voltage monitoring circuit, thereby stably supporting the normal operation of the voltage monitoring circuit and providing a guarantee for the safe operation of the monitored electrical appliances. The circuit structure design of the device is simple, the overall stability of the device is high, the economic cost is low, and it has the advantage of wide application.

[0041] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A supercapacitor backup power supply device for a voltage monitoring circuit, characterized in that: Including switching power supply, voltage monitoring module, energy storage super capacitor module; The switching power supply is electrically connected to the voltage monitoring module and the energy storage super capacitor module respectively, the voltage monitoring module is electrically connected to the energy storage super capacitor module, and the voltage monitoring module is electrically connected to the three-phase input of the monitored electrical appliance; The switching power supply is used to rectify the incoming AC power into DC power and output it to the voltage monitoring module and the energy storage super capacitor module respectively; The voltage monitoring module is used to monitor the voltage of the three-phase input of the monitored electrical appliance; The energy storage supercapacitor module is used to provide backup power supply to the voltage monitoring module when the switching power supply disconnects the DC power input to the voltage monitoring module.

2. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 1, characterized in that: The energy storage supercapacitor module includes an automatic switching circuit and at least one supercapacitor RC circuit; The automatic switching circuit is electrically connected to the supercapacitor RC circuit, the switching power supply, and the voltage monitoring module respectively; The automatic switching circuit is used to charge the supercapacitor RC circuit by connecting to the DC output terminal of the switching power supply when the switching power supply supplies power to the voltage monitoring module; The automatic switching circuit is also used to automatically switch to the super capacitor RC circuit for discharging to supply power to the voltage monitoring module when the switching power supply cuts off the power to the voltage monitoring module.

3. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 2, characterized in that: The automatic switching circuit includes a first constant current diode, a second constant current diode, and a first voltage balancing resistor; The positive electrode of the first constant current diode is electrically connected to the P24V positive electrode of the DC output end of the switching power supply, and the negative electrode of the first constant current diode is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and one end of the first voltage balancing resistor respectively; The cathode of the second constant current diode is connected to the 24V cathode of the DC output end of the switching power supply, and the anode of the second constant current diode is electrically connected to the other end of the first voltage balancing resistor; The other end of the first voltage balancing resistor is electrically connected to the supercapacitor RC circuit.

4. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 3, characterized in that: The supercapacitor RC circuit includes a second voltage-equalizing resistor and a first supercapacitor; The second voltage balancing resistor is connected in parallel with the first super capacitor; The positive electrode of the first super capacitor is electrically connected to the other end of the first voltage-equalizing resistor, and the negative electrode of the first super capacitor is grounded or electrically connected to another super capacitor RC circuit.

5. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 4, characterized in that: There are six supercapacitor RC circuits, which are connected in series in sequence, and the negative pole of the supercapacitor of the sixth supercapacitor RC circuit is grounded.

6. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 5, characterized in that: The six supercapacitor RC circuits include a first supercapacitor, a second supercapacitor, a third supercapacitor, a fourth supercapacitor, a fifth supercapacitor, a sixth supercapacitor, a second balancing resistor, a third balancing resistor, a fourth balancing resistor, a fifth balancing resistor, a sixth balancing resistor, and a seventh balancing resistor; The first super capacitor is connected in parallel with the second balancing resistor, the second super capacitor is connected in parallel with the third balancing resistor, the third super capacitor is connected in parallel with the fourth balancing resistor, the fourth super capacitor is connected in parallel with the fifth balancing resistor, the fifth super capacitor is connected in parallel with the sixth balancing resistor, and the sixth super capacitor is connected in parallel with the seventh balancing resistor; The positive electrode of the first supercapacitor is electrically connected to the other end of the first equalizing resistor, the positive electrode of the second supercapacitor is electrically connected to the negative electrode of the first supercapacitor, the positive electrode of the third supercapacitor is electrically connected to the negative electrode of the second supercapacitor, the positive electrode of the fourth supercapacitor is electrically connected to the negative electrode of the third supercapacitor, the positive electrode of the fifth supercapacitor is electrically connected to the negative electrode of the fourth supercapacitor, the positive electrode of the sixth supercapacitor is electrically connected to the negative electrode of the fifth supercapacitor, and the negative electrode of the sixth supercapacitor is grounded.

7. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 6, characterized in that: The voltage monitoring module includes a step-down circuit, a voltage measurement module, and a working power supply circuit; The step-down circuit and the working power supply circuit are electrically connected to the voltage measurement module respectively, the step-down circuit is electrically connected to the three-phase input of the monitored electrical appliance, and the working power supply circuit is electrically connected to the switching power supply and the automatic switching circuit respectively; The step-down circuit is used to step down the voltage after being connected to the three-phase input of the monitored electrical appliance; The working power supply circuit is used to input a DC power supply from a switching power supply or an energy storage super capacitor module to the voltage measurement module; The voltage measurement module is a voltage measurement chip used to measure the input voltage of the monitored electrical appliance.

8. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 7, characterized in that: The step-down circuit includes a first step-down transformer, a second step-down transformer, an eighth balancing resistor, a ninth balancing resistor, a tenth balancing resistor, and an eleventh balancing resistor; One end of the eighth balancing resistor is electrically connected to the R phase of the three-phase input of the monitored electrical appliance, and the other end of the eighth balancing resistor is electrically connected to one end of the primary side of the first step-down transformer; One end of the ninth voltage-equalizing resistor is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the ninth voltage-equalizing resistor is electrically connected to the other end of the primary side of the first step-down transformer; One end of the tenth voltage-equalizing resistor is electrically connected to the S phase of the three-phase input of the monitored electrical appliance, and the other end of the tenth voltage-equalizing resistor is electrically connected to one end of the primary side of the second step-down transformer; One end of the eleventh voltage-equalizing resistor is electrically connected to the T phase of the three-phase input of the monitored electrical appliance, and the other end of the eleventh voltage-equalizing resistor is electrically connected to the other end of the primary side of the second step-down transformer; One end of the secondary side of the first step-down transformer is electrically connected to a measurement pin of the voltage measurement chip; The other end of the secondary side of the first step-down transformer is electrically connected to one end of the secondary side of the second step-down transformer, and then electrically connected to another measurement pin of the voltage measurement chip; The other end of the secondary side of the second step-down transformer is electrically connected to another measurement pin of the voltage measurement chip.

9. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 8, characterized in that: The working power supply circuit includes a twelfth voltage-equalizing resistor and a voltage-limiting capacitor; One end of the twelfth voltage-equalizing resistor is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and the power supply pin of the voltage measurement chip, respectively, and the other end of the twelfth voltage-equalizing resistor is grounded; One end of the voltage-limiting capacitor is electrically connected to the 24V negative electrode of the DC output end of the switching power supply and the power supply pin of the voltage measurement chip, respectively, and the other end of the voltage-limiting capacitor is grounded.

10. The energy storage supercapacitor backup power supply device of the voltage monitoring circuit according to claim 9, characterized in that: The switching power supply includes a third step-down transformer, a rectifier bridge, and a filter capacitor; The primary side of the third step-down transformer is connected to an external AC power supply, and the secondary side of the third step-down transformer is electrically connected to the input end of the rectifier bridge; The filter capacitor is connected in parallel to the output end of the rectifier bridge, and the two ends of the filter capacitor are respectively the P24V positive pole and the 24V negative pole of the DC output end of the switching power supply.

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