CN204595075U - Power-fail detection circuit and device - Google Patents
Power-fail detection circuit and device Download PDFInfo
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- CN204595075U CN204595075U CN201520295872.5U CN201520295872U CN204595075U CN 204595075 U CN204595075 U CN 204595075U CN 201520295872 U CN201520295872 U CN 201520295872U CN 204595075 U CN204595075 U CN 204595075U
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Abstract
The utility model discloses a kind of power-fail detection circuit and device, this power-fail detection circuit is connected between the live wire of civil power and zero line, it comprises rectification module, Voltage stabilizing module and detection module, the input end of rectification module is connected with live wire, zero line respectively, the output terminal of rectification module is connected with the input end of Voltage stabilizing module, and the output terminal of Voltage stabilizing module is connected with the input end of detection module; Wherein, rectification module transfers to Voltage stabilizing module to forming direct current signal after AC signal rectification process, and Voltage stabilizing module transfers to detection module after carrying out voltage regulation filtering process to direct current signal, and detection module is according to the magnitude of voltage output switch amount signal of direct current signal; When on-off model is actuating switch amount signal, civil power is normal operating conditions; When on-off model is off on-off model, civil power is power-down state; Thus, exported by above-mentioned on-off model, can Timeliness coverage civil power power-down state, to inform that follow-up intelligent equipment is to process this power down situation in time.
Description
Technical field
The utility model relates to electrical measurement field, particularly relates to a kind of power-fail detection circuit and device.
Background technology
At present, civil power power down happens occasionally, and when the unexpected power down of civil power, produce great impact, and data during power down can not be preserved in time to the equipment much run; If civil power power down can not Timeliness coverage processing, even more serious security incident may be caused.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of power-fail detection circuit, is intended to detect civil power power down situation in time.
For achieving the above object, the utility model provides a kind of power-fail detection circuit, be connected between the live wire of civil power and zero line, this power-fail detection circuit rectification module, Voltage stabilizing module and detection module, the input end of described rectification module is connected with live wire, zero line respectively, the output terminal of described rectification module is connected with the input end of described Voltage stabilizing module, and the output terminal of described Voltage stabilizing module is connected with the input end of described detection module; Wherein, described rectification module transfers to Voltage stabilizing module to forming direct current signal after AC signal rectification process, described Voltage stabilizing module transfers to detection module after carrying out voltage regulation filtering process to described direct current signal, and described detection module is according to the magnitude of voltage output switch amount signal of described direct current signal; When described on-off model is actuating switch amount signal, described civil power is normal operating conditions; When described on-off model is off on-off model, described civil power is power-down state.
Preferably, described detection module comprises optocoupler, and the anode of the light emitting diode of described optocoupler inside is connected with the output terminal of described Voltage stabilizing module, the plus earth of light emitting diode; Collector and the output terminal launching very on-off model of the phototriode of described optocoupler inside; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module exports is more than or equal to the turn-on voltage of described light emitting diode, described detection module exports actuating switch amount signal; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module exports is less than the turn-on voltage of described light emitting diode, described detection module exports cut-off switch amount signal.
Preferably, described detection module also comprises the first resistance for current limliting, and one end of described first resistance is connected with the output terminal of described Voltage stabilizing module, and the described other end of the first resistance is connected with the anode of light emitting diode.
Preferably, described detection module also comprises the first electric capacity for filtering, and the common node between the anode of one end of described first electric capacity and described first resistance and light emitting diode is connected, the other end ground connection of described first electric capacity.
Preferably, described Voltage stabilizing module comprises partial pressure unit, voltage stabilizing diode, described partial pressure unit comprises the second resistance, the 3rd resistance, one end of described second resistance is connected with the output terminal of described rectification module, the other end of described second resistance is connected with one end of described 3rd resistance, the other end ground connection of described 3rd resistance, the common node between described second resistance with described 3rd resistance is connected with the input end of described detection module as the output terminal of described Voltage stabilizing module; The negative electrode of described voltage stabilizing diode is connected with described second resistance, the 3rd resistance, the plus earth of described voltage stabilizing diode.
Preferably, described Voltage stabilizing module also comprises the second electric capacity for filtering, and the common node of the negative electrode of the positive pole of described second electric capacity and described 3rd resistance and voltage stabilizing diode is connected, the minus earth of described second electric capacity.
Preferably, described Voltage stabilizing module also comprises the 3rd electric capacity for filtering, and the common node of the negative electrode of one end of described 3rd electric capacity and described second resistance and voltage stabilizing diode is connected, the other end ground connection of described 3rd electric capacity.
Preferably, described rectification module comprises commutation diode and the 4th electric capacity, and the anode of described commutation diode is connected with described live wire, and the negative electrode of described commutation diode is connected with one end of described 4th electric capacity, the other end of described 4th electric capacity is connected with zero line, described zero line grounding; The negative electrode of described commutation diode is connected with the input end of described Voltage stabilizing module with the output terminal of the common node between described 4th electric capacity as described rectification module.
Preferably, described rectification module also comprises the 4th resistance for current limliting, and one end of described 4th resistance is connected with live wire, and the other end of described 4th resistance is connected with the anode of described commutation diode.
In addition, for achieving the above object, the utility model additionally provides a kind of power loss detection means, and this power loss detection means comprises described power loss detection means and comprises input port, output port and at least one power-fail detection circuit; The side of described input port is connected with the live wire of single-phase civil power, zero line, or live wire, the zero line of the side of described input port and each phase in three-phase mains are connected, and the opposite side of described input port connects with the input end of the corresponding rectification module of described power-fail detection circuit; Described output port connects with the output terminal of the corresponding detection module of described power-fail detection circuit.
A kind of power-fail detection circuit provided by the utility model and device, be first rectified into direct current signal by rectification module by the high-voltage AC signal between live wire and zero line; And by exporting detection module to after the process of Voltage stabilizing module lowering and stabilizing blood pressure, this detection module detects the magnitude of voltage that Voltage stabilizing module exports, and judge civil power power-down state according to this magnitude of voltage output switch amount signal: when on-off model is actuating switch amount signal, civil power is normal operating conditions; When on-off model is off on-off model, civil power is power-down state.Thus exported by the on-off model of this power-fail detection circuit and device, can Timeliness coverage civil power power-down state, to inform that follow-up intelligent equipment is to process this power down situation in time.
Accompanying drawing explanation
Fig. 1 is the high-level schematic functional block diagram of the utility model power-fail detection circuit one embodiment;
Fig. 2 is the electrical block diagram in Fig. 1;
Fig. 3 is the structural representation of the utility model power loss detection means one embodiment.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of power-fail detection circuit.
With reference to the high-level schematic functional block diagram that Fig. 1, Fig. 1 are the utility model power-fail detection circuit one embodiment; In the present embodiment, this power-fail detection circuit 10 is connected between the live wire L of civil power and zero line N, this power-fail detection circuit 10 rectification module 100, Voltage stabilizing module 200 and detection module 300, the input end of described rectification module 100 is connected with live wire L, zero line N respectively, the output terminal of described rectification module 100 is connected with the input end of described Voltage stabilizing module 200, and the output terminal of described Voltage stabilizing module 200 is connected with the input end of described detection module 300; Wherein, form direct current signal after the 100 pairs of AC signal rectification process of described rectification module and transfer to Voltage stabilizing module 200, described Voltage stabilizing module 200 transfers to detection module 300 after carrying out voltage regulation filtering process to described direct current signal, and described detection module 300 is according to the magnitude of voltage output switch amount signal of described direct current signal; When described on-off model is actuating switch amount signal, described civil power is normal operating conditions; When described on-off model is off on-off model, described civil power is power-down state.
This power-fail detection circuit 10 can be connected between the live wire L of single-phase civil power and zero line N, also can be connected between the live wire L of each phase of three-phase mains and zero line N.Owing to being High Level AC Voltage between live wire L and zero line N, the equipment directly measuring its power down if use needs very high withstand voltage, and there is very large potential safety hazard; Therefore, in the present embodiment, first adopt rectification module 100 that the high-voltage AC signal between live wire L and zero line N is rectified into direct current signal; Because the voltage of AC signal because the load variations of electrical network, and may exist wider amplitude range, thus, after Voltage stabilizing module 200 voltage stabilizing process, export a stable direct current signal, in an embodiment, the processing procedure of this Voltage stabilizing module 200 is preferably lowering and stabilizing blood pressure process; When civil power is normal condition, the magnitude of voltage of the direct current signal that Voltage stabilizing module 200 exports is the magnitude of voltage of a range of stability, when civil power is power-down state, the magnitude of voltage of the direct current signal that Voltage stabilizing module 200 exports will be less than the magnitude of voltage of aforementioned stable scope, thus the magnitude of voltage being detected the direct current signal of Voltage stabilizing module 200 output by detection module 300 can judge whether civil power is in power-down state.When the magnitude of voltage of the direct current signal that detection module 300 detects is more than or equal to the preset voltage value of its inside, then detection module 300 exports actuating switch amount signal, and now, civil power is normal operating conditions; When being less than the preset voltage value of its inside when the magnitude of voltage of the direct current signal that detection module 300 detects, then detection module 300 exports cut-off switch amount signal, and now, civil power is power-down state.
By the on-off model of the output of above-mentioned power-fail detection circuit 10; can judge whether civil power is in power-down state in time; and the applied range of this power-fail detection circuit 10, its on-off model can be used as the processing module that input signal is connected to other, such as warning, power down protection etc.
Particularly, reference Fig. 2, Fig. 2 is the electrical block diagram of an embodiment of the utility model power-fail detection circuit; In the present embodiment, this detection module 300 comprises optocoupler U1, and the anode of the light emitting diode of described optocoupler U1 inside is connected with the output terminal of described Voltage stabilizing module 200, the plus earth of light emitting diode; Collector and the output terminal launching very on-off model of the phototriode of described optocoupler U1 inside; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module 200 exports is more than or equal to the turn-on voltage of described light emitting diode, described detection module 300 exports actuating switch amount signal; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module 200 exports is less than the turn-on voltage of described light emitting diode, described detection module 300 exports cut-off switch amount signal.
This optocoupler U1 inside comprises light emitting diode and phototriode, when the magnitude of voltage of the direct current signal that described Voltage stabilizing module 200 exports is more than or equal to the turn-on voltage of described light emitting diode, LEDs ON, light emitting diode sends Infrared, after phototriode receives this Infrared, then the collector of phototriode and emitter are in conducting state, now, the collector of this phototriode and emitter export actuating switch amount signal as the output terminal of on-off model; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module 200 exports is less than the turn-on voltage of described light emitting diode, light emitting diode is closed, light emitting diode will not send Infrared, then the collector of phototriode and emitter are in off-state, now, the collector of this phototriode and emitter export cut-off switch amount signal as the output terminal of on-off model.
In addition; Signal transmissions due to optocoupler U1 adopts electric signal to be converted to light signal, then is converted into the form of electric signal, thus has good electrical isolation effect for the input stage of optocoupler U1 and output stage; and the interference reduced between input stage and output stage, follow-up circuit is played a protective role.
It should be noted that detection module 300 also can adopt the devices such as metal-oxide-semiconductor, triode, relay to carry out the magnitude of voltage of the direct current signal detecting Voltage stabilizing module 200 output terminal and output switch amount signal.
Further, described detection module 300 also comprises the first resistance R1 for current limliting, and one end of described first resistance R1 is connected with the output terminal of described Voltage stabilizing module 200, and the other end of described first resistance R1 is connected with the anode of light emitting diode.
Also be connected with the first resistance R1 at the input end of optocoupler U1, this first resistance R1 is for limiting the electric current inputing to light emitting diode, and optocoupler U1 burns out by the excessive electric current exported to prevent Voltage stabilizing module 200; The resistance of this first resistance R1 can set according to demand, in this no limit.
Further, described detection module 300 also comprises the first electric capacity C1 for filtering, and the common node between the anode of one end of described first electric capacity C1 and described first resistance R1 and light emitting diode is connected, the other end ground connection of described first electric capacity C1.
The direct current signal that Voltage stabilizing module 200 exports is after the first resistance R1 current limliting, filtering process is carried out again through the first electric capacity C1, this first electric capacity C1 is mainly used in filtering peaking voltage and electrostatic potential, to prevent the impact failure optocoupler U1 of peak voltage and classical voltage; First resistance R1 and the first electric capacity C1 provides duplicate protection for optocoupler U1, to make the work of optocoupler U1 not by the interference of other signals, extends its serviceable life.
Further, described Voltage stabilizing module 200 comprises partial pressure unit, voltage stabilizing diode D1, described partial pressure unit comprises the second resistance R2, the 3rd resistance R3, one end of described second resistance R2 is connected with the output terminal of described rectification module 100, the other end of described second resistance R2 is connected with one end of described 3rd resistance R3, the other end ground connection of described 3rd resistance R3, the common node between described second resistance R2 with described 3rd resistance R3 is connected with the input end of described detection module 300 as the output terminal of described Voltage stabilizing module 200; The negative electrode of described voltage stabilizing diode D1 is connected with described second resistance R2, the 3rd resistance R3, the plus earth of described voltage stabilizing diode D1.
Second resistance R2, the 3rd resistance R3 are connected between the output terminal of rectification module 100 and ground and form partial pressure unit, and the common node of the second resistance R2, the 3rd resistance R3 is connected with the input end of detection module 300 as the output terminal of Voltage stabilizing module 200, the voltage signal that detection module 300 detects is the dividing potential drop gained of the 3rd resistance R3; So just avoid the high-voltage dc signal that Direct Sampling rectification module 100 exports, require to reduce to the compressive resistance of detection module 300, and the resistance of the second resistance R2, the 3rd resistance R3 can be carried out selection according to the withstand voltage scope of detection module 300 and be limited, and concrete numerical value is in this no limit.
Voltage due to rectification module 100 output is subject to the impact of AC network instability, the alternating voltage inputing to rectification module 100 is unstable, therefore the high-voltage dc signal through rectification module 100 output is also unstable, thus the dividing potential drop gained of the 3rd resistance R3 is also unstable, then may there is the possibility that too high level pressure impacts optocoupler U1; In order to avoid this kind of situation, a voltage stabilizing diode D1 in parallel at the two ends of the 3rd resistance R3, thus make the voltage stabilization at the 3rd resistance R3 two ends below a certain numerical value, concrete range of stability can select corresponding voltage stabilizing diode D1 according to the actual requirements, in the present embodiment, this voltage stabilizing diode D1 preferably adopts 5.1V voltage stabilizing value, i.e. the scope of the magnitude of voltage of the direct current signal of this Voltage stabilizing module 200 output is at below 5.1V.
Further, described Voltage stabilizing module 200 also comprises the second electric capacity C2 for filtering DC pulse ripple and the 3rd electric capacity C3 for filtering, the positive pole of described second electric capacity C2 is connected with the common node of the negative electrode of described 3rd resistance R3 and voltage stabilizing diode D1, the minus earth of described second electric capacity C2; One end of described 3rd electric capacity C3 is connected with the common node of the negative electrode of described second resistance R2 and voltage stabilizing diode D1, the other end ground connection of described 3rd electric capacity C3.
On the basis adopting the output of above-mentioned stabilivolt to Voltage stabilizing module 200 to limit, at the two ends of the 3rd resistance R3, second electric capacity C2 and the 3rd electric capacity C3 also in parallel is used for filtering high frequency ripple, this second electric capacity C2 preferably adopts electrochemical capacitor, and the 3rd electric capacity C3 preferably adopts ceramics or only stone low capacity electric capacity; And this second electric capacity C2 and the second resistance R2 forms low-pass filter, be mainly used in the pulsation ripple signal of the direct current signal that filtering rectification module 100 exports, 3rd electric capacity C3, for making up the situation of above-mentioned low-pass filter filtering high frequency ripple deficiency, protects follow-up detection module 300 further; Above-mentioned second electric capacity C2 and the 3rd electric capacity C3 can also play the effect protecting voltage stabilizing diode D1, avoids voltage stabilizing diode D1 to be punctured by high-frequency direct-current signal.
Further, described rectification module 100 comprises commutation diode D2 and the 4th electric capacity C4, the anode of described commutation diode D2 is connected with described live wire L, the negative electrode of described commutation diode D2 is connected with one end of described 4th electric capacity C4, the other end of described 4th electric capacity C4 is connected with zero line N, described zero line N ground connection; The negative electrode of described commutation diode D2 is connected with the input end of described Voltage stabilizing module 200 with the output terminal of the common node between described 4th electric capacity C4 as described rectification module 100.
In the present embodiment, this commutation diode D2 forms half-wave rectifying circuit, the high-voltage dc signal formed after rectification, this high-voltage dc signal is DC pulse moving voltage signal, there is more noise jamming, by the 4th electric capacity C4, filtering is carried out to the clutter in DC pulse moving voltage signal, thus effectively improve accuracy and the speed of detection module 300 detection.4th electric capacity C4 preferably adopts the high pressure electric capacity of the dacron of low-capacitance.
It should be noted that above-mentioned rectification circuit also can adopt other modes such as full-wave rectification, do not repeat one by one at this.
Further, described rectification module 100 also comprises the 4th resistance R4 for current limliting, and one end of described 4th resistance R4 is connected with live wire L, and the other end of described 4th resistance R4 is connected with the anode of described commutation diode D2.
Adopt the 4th resistance R4 to carry out current limliting at the input end of rectification module 100, effectively prevent electric current excessive in AC network from being damaged by commutation diode D2 and the 4th electric capacity C4.
The utility model also provides a kind of power loss detection means, is the structural representation of an embodiment of power loss detection means with reference to Fig. 3, Fig. 3; In the present embodiment, this power loss detection means comprises input port 20, output port 30 and three road power-fail detection circuits 10; The side of described input port 20 is connected with the live wire L of each phase in three-phase mains, zero line N, and the opposite side of described input port 20 connects with the input end of the corresponding rectification module 100 of each power-fail detection circuit 10; Described output port 30 connects with the output terminal of the corresponding detection module 300 of each power-fail detection circuit 10; The detection of power loss of this power loss detection means also applicable single-phase civil power, in single-phase city electric detection means, Zhi Xu mono-road power-fail detection circuit 10, the side of input port 20 is connected with the live wire L of single-phase civil power, zero line N, and opposite side is connected with the input end of the rectification module 100 of this power-fail detection circuit 10; Output port 30 is connected with the output terminal of the detection module 300 of this power-fail detection circuit 10.The structure of this power-fail detection circuit 10, principle of work and the beneficial effect that brings, all with reference to the description of above-described embodiment, do not repeat them here.
By above-mentioned power loss detection means, the power-down state of single-phase civil power and three-phase mains can be detected fast.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a power-fail detection circuit, be connected between the live wire of civil power and zero line, it is characterized in that, comprise rectification module, Voltage stabilizing module and detection module, the input end of described rectification module is connected with live wire, zero line respectively, the output terminal of described rectification module is connected with the input end of described Voltage stabilizing module, and the output terminal of described Voltage stabilizing module is connected with the input end of described detection module; Wherein, described rectification module transfers to Voltage stabilizing module to forming direct current signal after AC signal rectification process, described Voltage stabilizing module transfers to detection module after carrying out voltage regulation filtering process to described direct current signal, and described detection module is according to the magnitude of voltage output switch amount signal of described direct current signal; When described on-off model is actuating switch amount signal, described civil power is normal operating conditions; When described on-off model is off on-off model, described civil power is power-down state.
2. power-fail detection circuit as claimed in claim 1, it is characterized in that, described detection module comprises optocoupler, and the anode of the light emitting diode of described optocoupler inside is connected with the output terminal of described Voltage stabilizing module, the plus earth of described light emitting diode; Collector and the output terminal launching very on-off model of the phototriode of described optocoupler inside; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module exports is more than or equal to the turn-on voltage of described light emitting diode, described detection module exports actuating switch amount signal; When the magnitude of voltage of the direct current signal that described Voltage stabilizing module exports is less than the turn-on voltage of described light emitting diode, described detection module exports cut-off switch amount signal.
3. power-fail detection circuit as claimed in claim 2, it is characterized in that, described detection module also comprises the first resistance for current limliting, and one end of described first resistance is connected with the output terminal of described Voltage stabilizing module, and the described other end of the first resistance is connected with the anode of light emitting diode.
4. power-fail detection circuit as claimed in claim 3, it is characterized in that, described detection module also comprises the first electric capacity for filtering, and the common node between the anode of one end of described first electric capacity and described first resistance and light emitting diode is connected, the other end ground connection of described first electric capacity.
5. power-fail detection circuit as claimed in claim 1, it is characterized in that, described Voltage stabilizing module comprises partial pressure unit, voltage stabilizing diode, described partial pressure unit comprises the second resistance, the 3rd resistance, one end of described second resistance is connected with the output terminal of described rectification module, the other end of described second resistance is connected with one end of described 3rd resistance, the other end ground connection of described 3rd resistance, the common node between described second resistance with described 3rd resistance is connected with the input end of described detection module as the output terminal of described Voltage stabilizing module; The negative electrode of described voltage stabilizing diode is connected with described second resistance, the 3rd resistance, the plus earth of described voltage stabilizing diode.
6. power-fail detection circuit as claimed in claim 5, it is characterized in that, described Voltage stabilizing module also comprises the second electric capacity for filtering, and the common node of the negative electrode of the positive pole of described second electric capacity and described 3rd resistance and voltage stabilizing diode is connected, the minus earth of described second electric capacity.
7. power-fail detection circuit as claimed in claim 6, it is characterized in that, described Voltage stabilizing module also comprises the 3rd electric capacity for filtering, and the common node of the negative electrode of one end of described 3rd electric capacity and described second resistance and voltage stabilizing diode is connected, the other end ground connection of described 3rd electric capacity.
8. power-fail detection circuit as claimed in claim 1, it is characterized in that, described rectification module comprises commutation diode and the 4th electric capacity, the anode of described commutation diode is connected with described live wire, the negative electrode of described commutation diode is connected with one end of described 4th electric capacity, the other end of described 4th electric capacity is connected with zero line, described zero line grounding; The negative electrode of described commutation diode is connected with the input end of described Voltage stabilizing module with the output terminal of the common node between described 4th electric capacity as described rectification module.
9. power-fail detection circuit as claimed in claim 8, it is characterized in that, described rectification module also comprises the 4th resistance for current limliting, and one end of described 4th resistance is connected with live wire, and the other end of described 4th resistance is connected with the anode of described commutation diode.
10. a power loss detection means, is characterized in that, described power loss detection means comprises input port, output port and at least one power-fail detection circuit as claimed in any one of claims 1-9 wherein; The side of described input port is connected with the live wire of single-phase civil power, zero line, or live wire, the zero line of the side of described input port and each phase in three-phase mains are connected, and the opposite side of described input port connects with the input end of the corresponding rectification module of described power-fail detection circuit; Described output port connects with the output terminal of the corresponding detection module of described power-fail detection circuit.
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| CN201520295872.5U CN204595075U (en) | 2015-05-08 | 2015-05-08 | Power-fail detection circuit and device |
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| CN201520295872.5U CN204595075U (en) | 2015-05-08 | 2015-05-08 | Power-fail detection circuit and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914293A (en) * | 2015-05-08 | 2015-09-16 | 深圳市盈科互动科技有限公司 | Power failure detection circuit and power failure detection device |
| CN107478900A (en) * | 2017-08-11 | 2017-12-15 | 黎明职业大学 | A kind of AC power power factor isolation detection interface circuit |
| CN108594082A (en) * | 2018-06-28 | 2018-09-28 | 苏州欧普照明有限公司 | A kind of alternating current power-off signal transmission circuit and method |
| CN112649655A (en) * | 2020-12-25 | 2021-04-13 | 深圳市瑞必达科技有限公司 | Control circuit with AC power failure detection function |
-
2015
- 2015-05-08 CN CN201520295872.5U patent/CN204595075U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914293A (en) * | 2015-05-08 | 2015-09-16 | 深圳市盈科互动科技有限公司 | Power failure detection circuit and power failure detection device |
| CN104914293B (en) * | 2015-05-08 | 2018-03-30 | 深圳市盈科互动科技有限公司 | Power-fail detection circuit and device |
| CN107478900A (en) * | 2017-08-11 | 2017-12-15 | 黎明职业大学 | A kind of AC power power factor isolation detection interface circuit |
| CN108594082A (en) * | 2018-06-28 | 2018-09-28 | 苏州欧普照明有限公司 | A kind of alternating current power-off signal transmission circuit and method |
| CN108594082B (en) * | 2018-06-28 | 2024-01-26 | 苏州欧普照明有限公司 | Power-down signal transmission circuit and method for commercial power |
| CN112649655A (en) * | 2020-12-25 | 2021-04-13 | 深圳市瑞必达科技有限公司 | Control circuit with AC power failure detection function |
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