CN218100032U - Voltage stabilizing circuit based on capacitor - Google Patents
Voltage stabilizing circuit based on capacitor Download PDFInfo
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- CN218100032U CN218100032U CN202222436751.0U CN202222436751U CN218100032U CN 218100032 U CN218100032 U CN 218100032U CN 202222436751 U CN202222436751 U CN 202222436751U CN 218100032 U CN218100032 U CN 218100032U
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Abstract
The utility model discloses a voltage stabilizing circuit based on capacitance, which relates to the technical field of power control, and comprises a time delay self-starting module, a voltage stabilizing circuit and a voltage stabilizing circuit, wherein the time delay self-starting module is used for controlling the time delay work of a relay circuit; the charging control module is used for controlling the charging and discharging control module to charge; the power supply detection control module is used for detecting the power supply condition and controlling the discharge work of the charge-discharge control module; the input protection control module is used for detecting the electric quantity of the super capacitor circuit and controlling the work of the bleeder circuit; and the voltage stabilization control module is used for stabilizing voltage and outputting. The utility model discloses voltage stabilizing circuit based on electric capacity passes through the input of delay circuit and relay circuit delay control electric energy, and surge current absorbs surge current simultaneously to the influence of follow-up circuit when avoiding starting, and it is extravagant to avoid the unnecessary energy, and when super capacitor circuit is full of electricity, the control of releasing is carried out to the surge current who produces simultaneously, finally carries out steady voltage output by voltage stabilizing circuit.
Description
Technical Field
The utility model relates to a power control technology field specifically is a voltage stabilizing circuit based on electric capacity.
Background
Along with electronic equipment's continuous development, for guaranteeing electronic equipment's normal efficient work, need provide stable power environment for electronic equipment, current voltage stabilizing circuit adopts the steady voltage chip mostly, the steady voltage output of cooperation external components and parts completion power, it is intelligent lower, and for improving circuit safety, carry out surge discharge control to the input of electric energy, long-term surge protection leads to the loss increase of electric energy easily, be unfavorable for energy saving, and current voltage stabilizing circuit leads to the circuit to cut off the power supply suddenly because the trouble leads to at the power supply, cause the influence to voltage stabilizing circuit easily for a long time, for avoiding the influence that the power supply suddenly brought, can adopt super capacitor circuit to carry out transient power supply control, guarantee voltage stabilizing circuit's security.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a voltage stabilizing circuit based on electric capacity to solve the problem of proposing among the above-mentioned background art.
According to the embodiment of the utility model provides an in, provide a voltage stabilizing circuit based on electric capacity, this voltage stabilizing circuit based on electric capacity includes: the power supply control device comprises a power supply input module, a time delay self-starting module, a charging control module, a charging and discharging control module, a power supply detection control module, an input protection control module, a voltage stabilization control module and an output module;
the power supply input module is used for providing required electric energy;
the delay self-starting module is connected with the power input module and the charging control module, and is used for receiving the electric energy output by the power input module, triggering the delay work of the relay circuit and controlling the work of the charging control module;
the charging control module is used for outputting a charging control signal;
the power supply detection control module is connected with the power supply input module and used for detecting the electric energy condition of the power supply input module and outputting a discharge control signal;
the charging and discharging control module is connected with the charging control module and the power supply detection control module, and is used for receiving the charging control signal, controlling the energy storage work of the super capacitor circuit and receiving the discharging control signal and controlling the discharging work of the super capacitor circuit;
the input protection control module is connected with the charge and discharge control module, and is used for detecting the electric quantity condition of the super capacitor circuit, comparing the detected electric quantity information with a set electric quantity threshold value, and controlling the input electric energy to perform discharge work according to the comparison result;
the voltage stabilizing control module is connected with the delay self-starting module and is used for receiving the electric energy output by the delay self-starting module and performing voltage stabilizing adjustment through a voltage stabilizing circuit;
and the output module is connected with the voltage stabilization control module and used for receiving and outputting the stabilized voltage output by the voltage stabilization control module.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses voltage stabilizing circuit based on electric capacity adopts the time delay to absorb the electric energy from the module time delay of starting, surge current is to the influence of follow-up circuit when avoiding starting, absorb surge current by the super capacitor circuit among the charge-discharge control module simultaneously, avoid the unnecessary energy extravagant, wherein charge-discharge control module cooperation charge control module and power detection control module accomplish the charge-discharge control to super capacitor circuit, simultaneously by input protection control module when super capacitor circuit is full of electricity, the control of releasing is carried out to the surge current who produces, finally carry out steady voltage output by voltage stabilizing circuit, voltage stabilizing circuit's security performance is higher, and the loss of electric energy is lower, can the proruption outage condition of effectual reply.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram illustrating a principle of a voltage stabilizing circuit based on a capacitor according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a voltage stabilizing circuit based on a capacitor according to an embodiment of the present invention.
Fig. 3 is a connection circuit diagram of an input protection control module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In embodiment 1, referring to fig. 1, a capacitance-based voltage regulator circuit includes: the device comprises a power input module 1, a time-delay self-starting module 2, a charging control module 3, a charging and discharging control module 4, a power detection control module 5, an input protection control module 6, a voltage stabilization control module 7 and an output module 8;
specifically, the power input module 1 is used for providing required electric energy;
the delay self-starting module 2 is connected with the power input module 1 and the charging control module 3, and is used for receiving the electric energy output by the power input module 1, triggering the delay operation of the relay circuit and controlling the operation of the charging control module 3;
the charging control module 3 is used for outputting a charging control signal;
the power supply detection control module 5 is connected with the power supply input module 1 and is used for detecting the electric energy condition of the power supply input module 1 and outputting a discharge control signal;
the charge and discharge control module 4 is connected with the charge control module 3 and the power supply detection control module 5, and is used for receiving the charge control signal, controlling the energy storage work of the super capacitor circuit, and receiving the discharge control signal and controlling the discharge work of the super capacitor circuit;
the input protection control module 6 is connected with the charge and discharge control module 4, and is used for detecting the electric quantity condition of the super capacitor circuit, comparing the detected electric quantity information with a set electric quantity threshold value, and controlling the input electric energy to perform discharge work according to the comparison result;
the voltage stabilization control module 7 is connected with the delay self-starting module 2 and is used for receiving the electric energy output by the delay self-starting module 2 and performing voltage stabilization regulation through a voltage stabilizing circuit;
and the output module 8 is connected with the voltage stabilization control module 7 and used for receiving and outputting the stabilized voltage output by the voltage stabilization control module 7.
In a specific embodiment, the power input module 1 may use an AC power supply AC to provide required electric energy, and use a voltage-sensitive resistor RV1 to perform input protection, a capacitance-resistance voltage-reduction circuit formed by a twenty-first resistor R21 and a ninth capacitor C9 performs voltage reduction, and a rectifier T1 and a filter capacitor C1 perform rectification and filtering, which are not described herein again; the delay self-starting module 2 can adopt a delay circuit and a relay circuit to realize the delay self-starting control of the relay; the charging control module 3 can adopt a power tube circuit to carry out charging control; the charge and discharge control module 4 can adopt a bidirectional power tube circuit and a super capacitor circuit to realize the charge and discharge work of the super capacitor; the power detection control module 5 can adopt an optical coupling isolation circuit to realize the electric energy detection and the discharge control signal transmission of the power input module 1; the input protection control module 6 can adopt a comparison circuit to detect electric quantity and can also adopt a power tube circuit and a discharge resistor to carry out discharge control; the voltage stabilizing control module 7 can adopt a triode voltage stabilizing circuit; the output module 8 serves as a power output port, which is not described herein.
In embodiment 2, referring to fig. 2 and fig. 3, the delay self-starting module 2 includes a first diode D1, a fourth resistor R4, a first relay K1, a first voltage regulator VD1, a second capacitor C2, a first relay switch K1-1, and a second relay switch K1-2;
specifically, the anode of the first diode D1, the first end of the first relay switch K1-1, and the first end of the second relay switch K1-2 are all connected to the power input module 1, the cathode of the first diode D1 is connected to the first end of the first relay K1, the cathode of the first voltage regulator tube VD1, and one end of the second capacitor C2 through the fourth resistor R4, the other end of the second capacitor C2, the anode of the first voltage regulator tube VD1, and the second end of the first relay K1 are all grounded, and the second end of the first relay switch K1-1 and the second end of the second relay switch K1-2 are respectively connected to the voltage regulation control module 7 and the charge control module 3.
In a specific embodiment, the second capacitor C2 may be a polar capacitor, and is used for storing energy and controlling the operation of the first relay K1; the first relay switch K1-1 can adopt a normally open contact for controlling transmission of electric energy, the second relay switch K1-2 can adopt a normally closed contact for controlling the work of the charging control module 3, and the first relay switch K1-1 and the second relay switch K1-2 are controlled by the first relay K1.
Further, the charging control module 3 includes a ninth resistor R9, an eighth resistor R8, a seventh resistor R7, a first switching tube VT1, a tenth resistor R10, a fifth capacitor C5, a fourth capacitor C4, a sixth resistor R6, and a second voltage regulator tube VT2;
specifically, one end of the ninth resistor R9 is connected to the second end of the second relay switch K1-2, the other end of the ninth resistor R9 is connected to the base of the first switching tube VT1 and one end of the fifth capacitor C5, and is connected to the other end of the fifth capacitor C5, one end of the fourth capacitor C4, the anode of the second voltage regulator tube VT2, one end of the sixth resistor R6, and the ground through the tenth resistor R10, the collector of the first switching tube VT1 is connected to the first end of the second relay switch K1-2 through the eighth resistor R8, and the emitter of the first switching tube VT1 is connected to the other end of the sixth resistor R6, the cathode of the second voltage regulator tube VT2, the other end of the fourth capacitor C4, and the charge-discharge control module 4 through the seventh resistor R7.
In an embodiment, the first switch tube VT1 may be an NPN transistor.
Further, the charge and discharge control module 4 comprises a first power tube Q1, a second power tube Q2 and a super capacitor module;
specifically, the drain of the first power tube Q1 is connected to the first end of the first relay switch K1-1, the source of the first power tube Q1 is connected to the source of the second power tube Q2, the drain of the second power tube Q2 is connected to the first end of the super capacitor module, the second end of the super capacitor module is connected to the ground, the third end of the super capacitor module is connected to the input protection control module 6, the gate of the first power tube Q1 is connected to the cathode of the second voltage regulator tube VT2, and the gate of the second power tube Q2 is connected to the power detection control module 5.
In a specific embodiment, the first power transistor Q1 and the second power transistor Q2 may both be N-channel enhancement MOS transistors, where the first power transistor Q1 is used for charge control, and the second power transistor Q2 is used for discharge control.
Further, the power detection control module 5 includes a first resistor R1, a first optocoupler U1, a second resistor R2, a first power VCC1, a third resistor R3, a third capacitor C3, and a fifth resistor R5;
specifically, first resistance R1's one end is connected power input module 1, first resistance R1's the first end of connecting first opto-coupler U1's the other end, first power VCC1 connects first opto-coupler U1's third end, third electric capacity C3's one end and fifth resistance R5's one end through second resistance R2, third resistance R3's the other end and first opto-coupler U1's second end all ground connection, and first opto-coupler U1's fourth end is through third resistance R3 ground connection end, and fifth resistance R5's the other end is connected second power tube Q2's grid.
In a specific embodiment, the first optocoupler U1 may be a PC817 optocoupler, configured to detect whether the power input module 1 is powered off, and isolate and transmit a discharge control signal to control operation of the second power transistor Q2.
Further, the input protection control module 6 includes a sixteenth resistor R16, a seventeenth resistor R17, a first comparator A1, an electric quantity threshold, an eighteenth resistor R18, a nineteenth resistor R19, a second power source VCC2, a twentieth resistor R20, and a fourth power tube Q4;
specifically, sixteenth resistance R16's one end is connected the third end of super capacitor module, the homophase end of first comparator A1 and the ground connection end through seventeenth resistance R17 are connected to sixteenth resistance R16's the other end, the electric quantity threshold value is connected to first comparator A1's inverting terminal, first comparator A1's output passes through eighteenth resistance R18 and connects nineteenth resistance R19's one end and fourth power tube Q4's grid, fourth power tube Q4's drain electrode passes through twentieth resistance R20 and connects first power tube Q1's source electrode, second power VCC2 is connected to nineteenth resistance R19's the other end, fourth power tube Q4's source electrode connection ground.
In a specific embodiment, the sixteenth resistor R16 and the seventeenth resistor R17 form a resistor divider circuit, and are configured to detect an electric quantity condition of the super capacitor module; the first comparator A1 can be an LM393 comparator; the fourth power tube Q4 may be an N-channel enhanced MOD tube; the twentieth resistor R20 is used as a bleeder resistor, and the specific type is not limited.
Further, the voltage stabilization control module 7 includes an eleventh resistor R11, a twelfth resistor R12, a sixth capacitor C6, a seventh capacitor C7, a second switching tube VT2, a third switching tube VT3, a thirteenth resistor R13, a fourth switching tube VT4, a fifth switching tube VT5, a fifteenth resistor R15, a fourteenth resistor R14, a first potentiometer RP1, and an eighth capacitor C8; the output module 8 comprises an output port;
specifically, one end of the eleventh resistor R11, the collector of the second switching tube VT2, and the collector of the third switching tube VT3 are all connected to the second end of the first relay switch K1-1, the other end of the eleventh resistor R11 is connected to one end of the twelfth resistor R12 and is connected to the ground through the sixth capacitor C6, the emitter of the second switching tube VT2 is connected to the base of the third switching tube VT3, the emitter of the third switching tube VT3 is connected to the collector of the fifth switching tube VT5, the collector of the fourth switching tube VT4, the base of the second switching tube VT2, the other end of the twelfth resistor R12, one end of the seventh capacitor C7, one end of the fourteenth resistor R14, one end of the eighth capacitor C8, and the output port through the thirteenth resistor R13, the other end of the seventh capacitor C7, the emitter of the fourth switching tube VT4, one end of the fifteenth resistor R15, and the other end of the eighth capacitor C8 are all grounded, and the other end of the fourteenth resistor R14 is connected to the base of the fourth switching tube VT4, the emitter of the fifth switching tube VT5, and the emitter of the fifth capacitor RP 1.
In a specific embodiment, the second switching tube VT2, the third switching tube VT3, the fourth switching tube VT4, and the fifth switching tube VT5 may all be NPN-type triodes, wherein the second switching tube VT2 and the third switching tube VT3 form a darlington circuit; the first potentiometer RP1 is used to adjust the electric energy output by the voltage regulation control module 7.
The utility model relates to a voltage stabilizing circuit based on electric capacity, provide alternating current energy by alternating current AC, twenty first resistance R21 and ninth electric capacity C9 carry out step-down control, handle the required direct current of output through rectifier T1 and filter capacitor C1, the direct current of output carries out the energy storage through first diode D1 control second electric capacity C2, when second electric capacity C2, because second relay switch K1-2 is normally closed switch, first switch tube VT1 switches on this moment, make switching on of the first power tube Q1 of electric energy control of input, the electric energy transmits and carries out charge control for super capacitor module, after second electric capacity C2 is full of, first relay K1 gets the first relay switch K1-1 of electric control and switches on, second relay switch K1-2 disconnection, first power tube Q1 ends, super capacitor module stops charging, the electric energy transmission of power input module 1 output gives voltage stabilization control module 7, carry out voltage stabilization control by voltage stabilization control module 7, after super capacitor module is full of electricity, first output high level comparator A1 VCC 4, VCC power supply tube connects from VCC 4 then, the electric energy input module carries out the super capacitor module when the super capacitor module is started the super capacitor module and is started the first surge control module and is carried out the sudden input control, wherein, the super capacitor module is carried out the time delay control and is carried out the surge control.
This voltage stabilizing circuit based on electric capacity adopts time delay self-starting module 2 time delay input electric energy, the influence of surge current to follow-up circuit when avoiding starting, absorb surge current by the super capacitor circuit among the charge-discharge control module 4 simultaneously, avoid unnecessary energy waste, wherein charge-discharge control module 4 cooperates charge control module 3 and power detection control module 5 to accomplish the charge-discharge control to super capacitor circuit, simultaneously by input protection control module 6 when super capacitor circuit is full of electricity, carry out discharge control to the surge current who produces, finally carry out steady voltage output by voltage stabilizing circuit, voltage stabilizing circuit's security performance is higher, and the loss of electric energy is lower, can effectual reply proruption outage condition.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A voltage regulator circuit based on capacitor is characterized in that,
this voltage stabilizing circuit based on electric capacity includes: the power supply control device comprises a power supply input module, a time delay self-starting module, a charging control module, a charging and discharging control module, a power supply detection control module, an input protection control module, a voltage stabilization control module and an output module;
the power supply input module is used for providing required electric energy;
the delay self-starting module is connected with the power input module and the charging control module, and is used for receiving the electric energy output by the power input module, triggering the delay work of the relay circuit and controlling the work of the charging control module;
the charging control module is used for outputting a charging control signal;
the power supply detection control module is connected with the power supply input module and used for detecting the electric energy condition of the power supply input module and outputting a discharge control signal;
the charging and discharging control module is connected with the charging control module and the power supply detection control module, is used for receiving the charging control signal and controlling the energy storage work of the super capacitor circuit, and is used for receiving the discharging control signal and controlling the discharging work of the super capacitor circuit;
the input protection control module is connected with the charge and discharge control module, and is used for detecting the electric quantity condition of the super capacitor circuit, comparing the detected electric quantity information with a set electric quantity threshold value, and controlling the input electric energy to perform discharge work according to the comparison result;
the voltage stabilizing control module is connected with the delay self-starting module and is used for receiving the electric energy output by the delay self-starting module and performing voltage stabilizing regulation through a voltage stabilizing circuit;
and the output module is connected with the voltage stabilization control module and used for receiving and outputting the stabilized voltage output by the voltage stabilization control module.
2. The capacitor-based voltage stabilizing circuit of claim 1, wherein the time delay self-starting module comprises a first diode, a fourth resistor, a first relay, a first voltage regulator tube, a second capacitor, a first relay switch and a second relay switch;
the positive pole of first diode, first relay switch's first end and second relay switch's first end are all connected power input module, the negative pole of first diode pass through the first end of fourth resistive connection first relay, the negative pole of first stabilivolt and the one end of second electric capacity, the other end of second electric capacity, the positive pole of first stabilivolt and the second end of first relay all ground connection, the second end of first relay switch and the second end of second relay switch are connected respectively steady voltage control module and charging control module.
3. The capacitance-based voltage stabilizing circuit according to claim 2, wherein the charging control module comprises a ninth resistor, an eighth resistor, a seventh resistor, a first switch tube, a tenth resistor, a fifth capacitor, a fourth capacitor, a sixth resistor, and a second voltage regulator tube;
one end of the ninth resistor is connected with the second end of the second relay switch, the other end of the ninth resistor is connected with the base of the first switch tube and one end of the fifth capacitor, the other end of the fifth capacitor, one end of the fourth capacitor, the anode of the second voltage stabilizing tube, one end of the sixth resistor and the ground end are connected through the tenth resistor, the collector of the first switch tube is connected with the first end of the second relay switch through the eighth resistor, and the emitter of the first switch tube is connected with the other end of the sixth resistor, the cathode of the second voltage stabilizing tube, the other end of the fourth capacitor and the charge-discharge control module through the seventh resistor.
4. The capacitor-based voltage stabilizing circuit according to claim 3, wherein the charge and discharge control module comprises a first power tube, a second power tube and a super capacitor module;
the drain electrode of the first power tube is connected with the first end of the first relay switch, the source electrode of the first power tube is connected with the source electrode of the second power tube, the drain electrode of the second power tube is connected with the first end of the super capacitor module, the second end of the super capacitor module is connected with the ground end, the third end of the super capacitor module is connected with the input protection control module, the grid electrode of the first power tube is connected with the cathode of the second voltage-stabilizing tube, and the grid electrode of the second power tube is connected with the power supply detection control module.
5. The capacitance-based voltage stabilizing circuit of claim 4, wherein the power detection control module comprises a first resistor, a first optocoupler, a second resistor, a first power supply, a third resistor, a third capacitor, and a fifth resistor;
the one end of first resistance is connected the power input module, the first end of first opto-coupler is connected to the other end of first resistance, and first power passes through the third end of second ohmic connection first opto-coupler, the one end of third electric capacity and the one end of fifth resistance, and the other end of third resistance and the equal ground connection of second end of first opto-coupler, the fourth end of first opto-coupler passes through the third ohmic connection ground terminal, and the other end of fifth resistance is connected the grid of second power tube.
6. The capacitance-based voltage stabilizing circuit of claim 5, wherein the input protection control module comprises a sixteenth resistor, a seventeenth resistor, a first comparator, a power threshold, an eighteenth resistor, a nineteenth resistor, a second power supply, a twentieth resistor, and a fourth power transistor;
one end of the sixteenth resistor is connected with the third end of the super capacitor module, the other end of the sixteenth resistor is connected with the in-phase end of the first comparator and is connected with the ground end through the seventeenth resistor, the inverting end of the first comparator is connected with the electric quantity threshold value, the output end of the first comparator is connected with one end of the nineteenth resistor and the grid electrode of the fourth power tube through the eighteenth resistor, the drain electrode of the fourth power tube is connected with the source electrode of the first power tube through the twentieth resistor, the other end of the nineteenth resistor is connected with the second power supply, and the source electrode of the fourth power tube is connected with the ground end.
7. The capacitance-based voltage stabilizing circuit of claim 2, wherein the voltage stabilizing control module comprises an eleventh resistor, a twelfth resistor, a sixth capacitor, a seventh capacitor, a second switch tube, a third switch tube, a thirteenth resistor, a fourth switch tube, a fifth switch tube, a fifteenth resistor, a fourteenth resistor, a first potentiometer, and an eighth capacitor; the output module comprises an output port;
one end of the eleventh resistor, the collector of the second switch tube and the collector of the third switch tube are all connected with the second end of the first relay switch, the other end of the eleventh resistor is connected with one end of the twelfth resistor and is connected with the ground end through a sixth capacitor, the emitter of the second switch tube is connected with the base of the third switch tube, the emitter of the third switch tube is connected with the collector of the fifth switch tube, the collector of the fourth switch tube, the base of the second switch tube, the other end of the twelfth resistor, one end of the seventh capacitor, one end of the fourteenth resistor, one end of the eighth capacitor and the output port through a thirteenth resistor, the other end of the seventh capacitor, the emitter of the fourth switch tube, one end of the fifteenth resistor and the other end of the eighth capacitor are all grounded, the other end of the fourteenth resistor is connected with the base of the fourth switch tube, the other end of the fifteenth resistor and the emitter of the fifth switch tube through a first potentiometer, and the base of the fifth switch tube is connected with the slider end of the first potentiometer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115856702A (en) * | 2023-03-02 | 2023-03-28 | 深圳华泰源通技术服务有限公司 | UPS power supply detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115856702A (en) * | 2023-03-02 | 2023-03-28 | 深圳华泰源通技术服务有限公司 | UPS power supply detection device |
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