CN214337591U - Alarm driving circuit and power failure monitoring device - Google Patents
Alarm driving circuit and power failure monitoring device Download PDFInfo
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- CN214337591U CN214337591U CN202023120875.5U CN202023120875U CN214337591U CN 214337591 U CN214337591 U CN 214337591U CN 202023120875 U CN202023120875 U CN 202023120875U CN 214337591 U CN214337591 U CN 214337591U
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Abstract
The utility model discloses an alarm drive circuit, supply power through the power supply interface, a warning signal is generated according to abnormal signal, it includes switch circuit, but logic circuit and automatic re-setting's operating switch, switch circuit is according to abnormal signal action and the first switching signal that the output corresponds, the exportable second switching signal of operating switch, logic circuit's two inputs connect first switching signal and second switching signal respectively, an output alarm signal, logic circuit exports alarm signal when the power supply interface begins the circular telegram, remove alarm signal when receiving the second switching signal, output alarm signal when receiving first switching signal. Compared with the prior art, the utility model discloses after the circular telegram, not only can detect whether normal switch-on of power, can also detect whether normal work of warning drive circuit. The utility model also discloses a power down monitoring devices who has this warning drive circuit.
Description
Technical Field
The utility model relates to a drive circuit of unusual warning especially relates to an alarm drive circuit and power down monitoring devices.
Background
The circuit that is used for falling the electric detection at present on the market is various, and each falls the electric detection and all needs stable mains operated, when detecting, with the power plug to the pick-up plate on, in order to prevent that the power supply of pick-up plate from falling the electric, generally can set up power indicator lamp on the pick-up plate and carry out power indication, then when power plug inserts the pick-up plate, if insert steadily, the pick-up plate does not communicate the power this moment, and can not discover in time. If set up special pilot lamp on the pick-up plate and instruct the pick-up plate circular telegram, not only give the light alarm of pick-up plate easily and produce the interference, also can not discover in time if other circuit trouble of pick-up plate self, for example the alarm damages scheduling problem.
Therefore, there is an urgent need for a power failure monitoring device that can solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an alarm drive circuit, before the detection, carry out the line detection promptly automatically during the intercommunication power to detect monitoring line self and have trouble, safe and reliable.
Another object of the utility model is to provide a power down monitoring device can carry out the line detection automatically during the intercommunication power before detecting to detect power down monitoring device self and have trouble, safe and reliable.
In order to achieve the above object, the utility model discloses an alarm drive circuit for according to an abnormal signal generation alarm signal, a power supply interface is right the alarm drive circuit power supply, its characterized in that: the power supply interface is characterized by comprising a switch circuit, a logic circuit and an operating switch capable of automatically resetting, wherein the switch circuit acts according to the abnormal signal and outputs a first switch signal, the operating switch is operated to output a second switch signal, two input ends of the logic circuit are respectively connected with the first switch signal and the second switch signal, one output end of the logic circuit outputs the alarm signal, the logic circuit outputs the alarm signal when the power supply interface starts to be electrified, releases the alarm signal when receiving the second switch signal, and outputs the alarm signal when receiving the first switch signal.
Compared with the prior art, the utility model discloses when power supply interface switch on, logic circuit direct control generates alarm signal and instructs, not only can instruct the power whether normally the switch on, can also detect logic circuit along with it whether can normally work, the operation switch can cancel the warning for logic circuit can normally work and carry out unusual warning, convenient operation, and do not influence normal unusual warning.
Preferably, the switch circuit is an isolating switch circuit, so that abnormal signals are effectively isolated, and the safety and stability of the operation of the circuit are ensured.
Preferably, the switch circuit includes a photoelectric isolating switch and a driving switch, an input side of the photoelectric isolating switch is connected with the abnormal signal, an output side of the photoelectric isolating switch is connected with a control end of the driving switch, and the driving switch is controlled to be turned on when receiving the power-down signal, and then outputs the first switch signal to the logic circuit.
Specifically, the driving switch includes a first switch tube and a protection resistor, an output side of the optoelectronic isolation switch is connected to a control end of the first switch tube, the first switch tube and the protection resistor are connected in series between a VDD port and a ground port of the power supply interface, a node between the first switch tube and the protection resistor is connected to an input end of the logic circuit, and the optoelectronic isolation switch controls the first switch tube to operate when receiving the abnormal signal so as to output a first switch signal to the logic circuit.
Preferably, the logic circuit includes two logic gates of the same type, first input ends of the two logic gates are respectively connected to an output end of another logic gate, second input ends of the two logic gates are respectively connected to an output end of the switch circuit and an output end of the operation switch, the logic gate connected to the operation switch is an output logic gate, and an output end of the output logic gate outputs the alarm signal. Simple structure, low cost and easy realization.
Specifically, the logic gate is a nand gate, the first switch signal and the second switch signal are both low-level signals, and the output end of the output logic gate outputs a low-level alarm signal.
Specifically, the logic gate is a nor gate, the first switch signal and the second switch signal are both high-level signals, and the output end of the output logic gate outputs a high-level alarm signal.
Preferably, the operation switch comprises a push switch and a protection resistor which are connected in series between a VDD port and a ground port of the power supply interface.
The utility model also discloses a power failure monitoring device, including power failure detection circuit, warning drive circuit and alarm, and to the power supply interface of warning drive circuit and alarm power supply, power failure detection circuit is to warning drive circuit transmission power failure signal when the power supply of being surveyed loses electricity, warning drive circuit basis power failure signal to alarm transmission alarm signal, alarm basis alarm signal sends out the police dispatch newspaper, warning drive circuit includes switch circuit, logic circuit and automatic re-settable operating switch, switch circuit basis power failure signal action and output corresponding first switch signal, operate operating switch exports second switch signal, logic circuit's two input ends connect respectively first switch signal and second switch signal, an output end connects the input of alarm, the logic circuit outputs an alarm signal when the power supply interface starts to be electrified, releases the alarm signal when receiving the second switch signal, and outputs the alarm signal when receiving the first switch signal.
Compared with the prior art, the utility model discloses power down monitoring devices is when power supply interface switch on, and logic circuit direct control alarm is opened, not only can detect whether normal switch on of power, can also detect whether logic circuit and alarm can normally work, the operation operating switch can cancel the warning for logic circuit can normally work and fall the warning, and convenient operation does not just influence normal warning of falling the power.
Wherein, the utility model discloses a fall the electricity including completely falling the electricity and the point of falling below the specified value.
Preferably, the switch circuit is an isolating switch circuit, and one side of the isolating switch circuit, which is close to the logic circuit, is powered by the power supply interface. This scheme makes the utility model discloses when can be used for the thunderbolt test, switching power supply's power down detects, uses oscilloscope to carry out the output voltage monitoring in being different from current detection, the utility model discloses with low costs, it is small.
Preferably, the switch circuit includes a photoelectric isolating switch and a driving switch, an input side of the photoelectric isolating switch is connected with an output signal of the power-down detection circuit, an output side of the photoelectric isolating switch is connected with a control end of the driving switch and controls the driving switch to be turned on when receiving a power-down signal, and the driving switch outputs a first switch signal to the logic circuit accordingly.
Specifically, the driving switch comprises a first switch tube and a protection resistor, the output side of the optoelectronic isolation switch is connected with the control end of the first switch tube, the first switch tube and the protection resistor are connected in series between the VDD port and the ground port of the power supply interface, a node between the first switch tube and the protection resistor is connected with one input end of the logic circuit, and the optoelectronic isolation switch controls the first switch tube to act to output a first switch signal to the logic circuit when receiving the power-down signal. Make the utility model discloses can be used for when thunderbolt tests, carry out switching power supply's power down detection, use oscilloscope to carry out output voltage monitoring in being different from current detection, the utility model discloses with low costs, it is small.
Preferably, the logic circuit includes two logic gates of the same type, first input ends of the two logic gates are respectively connected to an output end of another logic gate, second input ends of the two logic gates are respectively connected to an output end of the switch circuit and an output end of the operation switch, the logic gate connected to the operation switch is an output logic gate, and the alarm is connected in series between one port of the power supply interface and the output end of the output logic gate. Simple structure, low cost and easy realization.
Specifically, the logic gate is a nand gate, the first switch signal and the second switch signal are both low-level signals, and the alarm is connected in series between a VDD port of the power supply interface and the output end of the output logic gate.
Specifically, the logic gate is a nor gate, the first switching signal and the second switching signal are both high-level signals, and the alarm is connected in series between a ground port of the power supply interface and an output end of the output logic gate.
Preferably, the power failure detection circuit includes a voltage dividing circuit, a charging capacitor, a second switch tube, a second varistor and a detected power interface, the detected power interface is used for receiving a detected power and includes a Vout pin and a ground pin, the voltage dividing circuit includes a first resistor and a first varistor which are sequentially connected in series between the Vout pin and the ground pin, the charging capacitor is connected between an output end of the voltage dividing circuit and the ground pin, the second switch tube is a PNP triode, a base of the second switch tube is connected to the Vout pin through a second resistor, an emitter is connected to an anode of the charging capacitor, a collector is connected to an input end of the switch circuit through the second varistor, and another input end of the switch circuit is grounded. Be different from prior art, the utility model discloses use first rheostat to combine the voltage threshold value that the triode action can effectively be adjusted to the regulation falls the power failure voltage that the electricity detected and judges the benchmark value, can be applicable to different switching power supply and detect, is applicable to different demands.
Preferably, the output terminal of the voltage dividing circuit is connected to the anode of the charging capacitor through a rectifying diode.
Preferably, the operation switch comprises a push switch and a protection resistor which are connected in series between a VDD port and a ground port of the power supply interface.
Preferably, the alarm comprises a light emitting diode and a protection resistor which are connected in series.
Preferably, the power failure monitoring device further comprises a power supply board, the power failure detection circuit, the alarm driving circuit and the alarm are installed on a detection board, a power supply circuit is installed on the power supply board and generates a power supply source, the power supply interface can be connected with the power supply source to supply power to the alarm driving circuit and the alarm, the power supply board and the detection board are provided with preset intervals, the detection board can be effectively protected, and the alarm is prevented from being triggered and started by mistake.
Preferably, the power-down detection circuit is configured to detect whether a switching power supply is powered down.
Drawings
Fig. 1 is the utility model discloses a power down monitoring devices's block diagram.
Fig. 2 is a circuit diagram of a power down monitoring device in a first embodiment of the present invention.
Fig. 3 is a circuit diagram of an alarm driving circuit and an alarm in a power down monitoring device according to a second embodiment of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
Referring to fig. 1, the utility model discloses a power failure monitoring device 100, including power failure detection circuit 10, alarm drive circuit 20 and alarm 30, and to the power supply interface 40 of alarm drive circuit 20 and alarm 30 power supply, power failure detection circuit 10 when being surveyed power supply Uo falls the power to alarm drive circuit 20 carries power down signal S1, alarm drive circuit 20 foundation power down signal S1 to alarm 30 carries alarm signal S4, alarm 30 foundation alarm signal S4 sends out the police dispatch newspaper.
Referring to fig. 1, the alarm driving circuit 20 includes a switch circuit 21, a logic circuit 22 and an operation switch 23 capable of automatically resetting, the switch circuit 21 operates according to the power-down signal S1 and outputs a corresponding first switch signal S2, the operation switch 23 is operated to output a second switch signal S3, two input ends of the logic circuit 22 are respectively connected to the first switch signal S2 and the second switch signal S3, one output end is connected to an input end of the alarm 30, the logic circuit 22 outputs an alarm signal S4 when the power supply interface 40 starts to be powered on, releases the alarm signal S4 when receiving the second switch signal S3, and outputs the alarm signal S4 when receiving the first switch signal S2.
In this embodiment, the power down detection circuit 10 is used to detect whether a switching power supply is powered down.
Referring to fig. 1, the power failure detection circuit 10 has a tested power interface, the tested power interface is used for inputting a tested power Uo, the tested power interface includes a Vout pin and a ground pin, the Vout pin inputs Vout of the tested power Uo, and the ground pin is connected to GND1 of the tested power Uo.
With continued reference to fig. 1, the power failure monitoring device 100 further includes a power supply board 102, the power failure detection circuit 10, the alarm driving circuit 20 and the alarm 30 are mounted on a detection board 101, a power supply circuit 41 is mounted on the power supply board 102 and generates a power supply Ud, the power supply interface 40 can receive the power supply Ud to supply power to the alarm driving circuit 20 and the alarm 30, and the power supply board 102 and the detection board 101 have a preset distance therebetween, so as to effectively protect the detection board 101 and avoid false triggering and starting the alarm 30. In this embodiment, a distance of 7mm is maintained between the detection plate 101 and the power supply plate 102.
Referring to fig. 2, in the embodiment, the power supply interface 40 is used for inputting a power supply Ud, the power supply interface 40 has a VDD port and a ground port, the VDD port is connected to VDD of the power supply Ud, and the ground port is connected to GND2 of the power supply Ud.
Referring to fig. 2, the power failure detection circuit 10 includes a voltage divider circuit 11, a charging capacitor C, a second switch tube Q2, and a second rheostat RS2, where the voltage divider circuit 11 includes a first resistor R1 and a first rheostat RS1 that are sequentially connected in series between a Vout pin (Vout) and a ground pin (GND1) of a power source Ud to be detected, the charging capacitor C is connected between an output end of the voltage divider circuit 10 and the ground pin (GND1), the second switch tube Q2 is a PNP triode, a base of the second switch tube Q2 is connected to the Vout pin (Vout) through a second resistor, an emitter is connected to an anode of the charging capacitor, a collector is connected to an input end of the switch circuit 21 through the second rheostat RS2, and another input end of the switch circuit 21 is connected to the ground pin (GND 1). The power down detection circuit 10 outputs a power down signal S1 with a high level when the voltage of the power supply Uo to be detected is low to a preset value. Of course, the first rheostat RS1 and the second rheostat RS2 can be replaced by resistors with determined resistance values, and in this case, the comparison standard for detecting the power failure by the power failure detection circuit 10 is determined.
The output end of the voltage dividing circuit 10 is connected to the positive electrode of the charging capacitor C through a rectifying diode D1.
When the voltage Vout (for example, Vout-12V) of the power source to be detected is stably output during operation, Vout-12V passes through the fuse F1, one path of the voltage goes through the first resistor R1 and the first rheostat RS1 to the power ground GND1, and after the voltage is divided by the voltage dividing circuit 11, the divided voltage UR2 is 11.52V, the divided voltage charges the capacitor C through the diode D, and after the capacitor C is fully charged, the voltage Uc at both ends is UR 2-Vd (voltage drop of the diode D) is 11.52V-0.7V-10.82V, that is, the emitter voltage Ue of the second switching tube Q2 is 10.82V; the other path of Vout passes through a resistor R2 to a base of a second switching tube Q2, a base voltage Ub is 12V, the second switching tube Q2 is a PNP type triode, and when Ue is less than Ub, the second switching tube Q2 is in a cut-off state and does not output a power-down signal S1.
When the output voltage Vout is powered down, for example, Vout drops from 12V to 10.12V, where Ub is 10.12V, Ue is 10.82V, and Ue-Ub is 0.7V, the second switching tube Q2 is turned on, and the path capacitor C positive electrode — Ueb of the second switching tube Q2-the resistor R2-the first resistor R1-the first varistor RS 1-GND 1. At this time, a path is opened between the emitter and the collector of the second switching tube Q2: the positive electrode of the C1, Uec of the second switch tube Q2, the second varistor RS2, outputs the power-down signal S1 to the switch circuit 21.
Referring to fig. 2, the switch circuit 21 is an isolation switch circuit, and the output side of the isolation switch circuit is powered by the power supply Ud. The input side of the isolating switch circuit is supplied by a power supply Uo to be tested.
Referring to fig. 2, the switch circuit 21 includes a photo-isolation switch U1 and a first switch tube Q1, an input side of the photo-isolation switch U1 is connected to the power-down signal S1 output by the power-down detection circuit 10, an output side of the photo-isolation switch U1 is connected in series to a control terminal of the first switch tube Q1, and the photo-isolation switch U1 controls the first switch tube Q1 to operate when receiving the power-down signal S1, so that the first switch tube Q1 outputs a first switch signal S2 to the logic circuit 22.
In this embodiment, the first switch Q1 is an NPN transistor, one end of the output side of the optoelectronic isolation switch U1 is connected to the base of the first switch Q1, the other end is connected to the ground port (GND2), the collector of the first switch Q1 is connected to the VDD port (VDD) through the resistor R4, and the emitter is connected to the ground port (GND 2). When the photoelectric isolating switch U1 does not receive a power-down signal, the photoelectric isolating switch U1 is not conducted, and the first switch tube Q1 is in an off state. When receiving the power-down signal S1, the photo isolator U1 is turned on, so that the base of the first switch transistor Q1 is grounded through the resistor R3, the first switch transistor Q1 is turned on, and the output end of the first switch transistor Q1 is grounded to pull down the output signal, thereby outputting a first switch signal S2 at a low level. Of course, the structure of the switch circuit 21 is not limited to the above-described embodiment.
Referring to fig. 2, in the present embodiment, the operation switch 23 includes a push switch SW1 and a protection resistor R6 connected in series between the VDD port (VDD) and the ground port (GND2) of the power supply interface 40. The operation switch 23 may be a resettable switch circuit having another configuration.
Referring to fig. 2, in the present embodiment, the logic circuit 22 includes two nand gates U2, U3 of the same type, a first input of the nand gate U2 is connected to the output of the nand gate U3, a first input of the nand gate U3 is connected to the output of the nand gate U2, a second input of the nand gate U2 is connected to the output of the switch circuit 21, a second input of the nand gate U3 is connected to the output of the operation switch 23, the first switch signal S2 and the second switch signal S3 are both low-level signals, and the alarm 30 is connected in series between the VDD port (VDD) of the power supply interface 40 and the output of the nand gate U3.
In this embodiment, the alarm 30 includes a resistor R5 and a light emitting diode LED connected in series.
Before the test, when the power supply Uo to be tested is stable or is not connected, the power supply Ud is switched on, the first switch tube Q1 is cut off, the switch circuit 21 outputs a high level signal, the push switch SW1 of the operation switch 23 is switched off, and the operation switch 23 outputs a high level signal. The output end of the nand gate U3 outputs a low level signal, and the light emitting diode LED of the alarm 30 is turned on to emit light, so as to give an alarm to indicate that the alarm driving circuit 20 and the alarm 30 work normally.
When the operation switch 23 is operated to turn on the push switch SW1, the first input terminal of the nand gate U3 is pulled low, the output terminal of the nand gate U3 outputs high, and the output terminal of the nand gate U2 outputs low. After the push switch SW1 is put down, the operation switch 23 is reset, the first input end of the nand gate U3 inputs high level, the output end of the nand gate U3 keeps outputting high level due to the action delay of the nand gate element, and the light emitting diode LED of the alarm 30 does not emit light.
When a power failure test is carried out:
if the output voltage Vout is stably output, the input side of the opto-isolator U1 in the switch circuit 21 is not turned on, the output side of the opto-isolator U1 is not turned on, the first switch Q1 is turned off, the output end of the nand gate U3 keeps outputting a high level, and the light emitting diode LED of the alarm 30 does not emit light.
If the output voltage Vout has a power-down phenomenon, the input side of the optoelectronic isolator U1 in the switch circuit 21 is turned on, the output side of the optoelectronic isolator U1 is turned on, the first switch tube Q1 is turned on, the output end of the switch circuit 21 is pulled low and grounded to output a low level, the switch circuit 21 outputs a first switch signal S1, the output end of the nand gate U2 outputs a high level, the second input end of the nand gate U3 is connected to the high level signal, the output end of the nand gate U3 outputs a low level signal accordingly, the light emitting diode LED of the alarm 30 is turned on to emit light, and alarm indication is performed on the power-down condition.
Referring to fig. 3, in a second embodiment of the present invention, the logic circuit 22 'includes two nor gates U2', U3 'of the same type, in which a first input of the nor gate U2' is connected to an output of the nor gate U3 ', a first input of the nor gate U3' is connected to an output of the nor gate U2 ', a second input of the nor gate U2' is connected to an output of the switch circuit 21, and a second input of the nor gate U3 'is connected to an output of the operation switch 23, the first switch signal S2 and the second switch signal S3 are both high level signals, and the alarm 30 is connected in series between an output of the ground port (GND2) of the power supply interface 40 and the output of the nor gate U3'.
Unlike the first embodiment, the operation switch 23' includes a push switch SW1 and a protection resistor R6 connected in series between the VDD port (VDD) and the ground port (GND2) in this order. The first switch Q1 and the resistor R4 in the switch circuit 21' are connected in series between the VDD port (VDD) and the ground port (GND 2). The positive pole of the alarm 30 is connected to the output of the logic circuit 22.
Of course, the structure of the logic circuit is not limited to the above embodiment, and other circuit structures may be employed.
Of course, the utility model discloses an alarm drive circuit can also be used for the alarm drive of other abnormal signal, is not limited to the power down signal. The structure of the alarm is not limited to the above embodiments, and may be an audio alarm, a display screen alarm, or the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.
Claims (10)
1. An alarm driving circuit for generating an alarm signal according to an abnormal signal, a power supply interface supplying power to the alarm driving circuit, characterized in that: the power supply interface is characterized by comprising a switch circuit, a logic circuit and an operating switch capable of automatically resetting, wherein the switch circuit acts according to the abnormal signal and outputs a first switch signal, the operating switch is operated to output a second switch signal, two input ends of the logic circuit are respectively connected with the first switch signal and the second switch signal, one output end of the logic circuit outputs the alarm signal, the logic circuit outputs the alarm signal when the power supply interface starts to be electrified, releases the alarm signal when receiving the second switch signal, and outputs the alarm signal when receiving the first switch signal.
2. The alarm driving circuit according to claim 1, wherein: the switch circuit is an isolating switch circuit.
3. The alarm driving circuit according to claim 1, wherein: the switch circuit comprises a photoelectric isolating switch, a first switch tube and a protective resistor, wherein the input side of the photoelectric isolating switch is connected with an abnormal signal, the output side of the photoelectric isolating switch is connected with the control end of the first switch tube, the first switch tube and the protective resistor are connected in series between a VDD port and a ground port of a power supply interface, a node between the first switch tube and the protective resistor is connected with an input end of the logic circuit, and the photoelectric isolating switch receives the abnormal signal and controls the first switch tube to act so as to output the first switch signal to the logic circuit.
4. The alarm driving circuit according to claim 1, wherein: the logic circuit comprises two logic gates with the same type, first input ends of the two logic gates are respectively connected with the output end of the other logic gate, second input ends of the two logic gates are respectively connected with the output end of the switch circuit and the output end of the operating switch, the logic gate connected with the operating switch is an output logic gate, and the output end of the output logic gate outputs the alarm signal.
5. The alarm driving circuit according to claim 4, wherein: the logic gate is a NAND gate, the first switch signal and the second switch signal are both low-level signals, and the output end of the output logic gate outputs a low-level alarm signal.
6. The alarm driving circuit according to claim 4, wherein: the logic gate is a NOR gate, the first switch signal and the second switch signal are both high-level signals, and the output end of the output logic gate outputs a high-level alarm signal.
7. The alarm driving circuit according to claim 1, wherein: the operating switch comprises a push switch and a protective resistor which are connected between a VDD port and a ground port of the power supply interface in series.
8. The utility model provides a power failure monitoring device, is including falling electric detection circuitry, warning drive circuit and alarm, fall electric detection circuitry when being surveyed the power failure to warning drive circuit carries the power down signal, warning drive circuit basis fall electric signal to alarm carries alarm signal, the alarm basis alarm signal sends out alarm, its characterized in that: the alarm driving circuit as claimed in any one of claims 1 to 7, wherein the abnormal signal is a power-down signal.
9. The power loss monitoring device of claim 8, wherein: the power failure detection circuit comprises a voltage division circuit, a charging capacitor, a second switch tube, a second rheostat and a detected power interface, wherein the detected power interface is used for being connected with a detected power and comprises a Vout pin and a ground pin, the voltage division circuit comprises a first resistor and a first rheostat which are sequentially connected between the Vout pin and the ground pin in series, the output end of the voltage division circuit is connected with the anode of the charging capacitor through a rectifier diode, the cathode of the charging capacitor is connected with the ground pin, the second switch tube is a PNP triode, the base electrode of the second switch tube is connected with the Vout pin through a second resistor, the emitting electrode of the second switch tube is connected with the anode of the charging capacitor, the collector electrode of the second switch tube is connected with the input end of the switch circuit through the second rheostat, and the other input end of the switch circuit is connected with the ground pin.
10. The power loss monitoring device of claim 8, wherein: the power failure detection circuit, the alarm driving circuit and the alarm are installed on a detection board, a power supply circuit is installed on the power supply board and generates a power supply source, the power supply interface can be connected with the power supply source to supply power to the alarm driving circuit and the alarm, and the power supply board and the detection board are provided with a preset distance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023120875.5U CN214337591U (en) | 2020-12-22 | 2020-12-22 | Alarm driving circuit and power failure monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023120875.5U CN214337591U (en) | 2020-12-22 | 2020-12-22 | Alarm driving circuit and power failure monitoring device |
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| CN214337591U true CN214337591U (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315187A (en) * | 2020-12-22 | 2021-08-27 | 深圳市奥达电源科技有限公司 | Alarm driving circuit and power failure monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315187A (en) * | 2020-12-22 | 2021-08-27 | 深圳市奥达电源科技有限公司 | Alarm driving circuit and power failure monitoring device |
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