CN211478445U - Simple input power failure detection circuit - Google Patents
Simple input power failure detection circuit Download PDFInfo
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- CN211478445U CN211478445U CN201922312223.2U CN201922312223U CN211478445U CN 211478445 U CN211478445 U CN 211478445U CN 201922312223 U CN201922312223 U CN 201922312223U CN 211478445 U CN211478445 U CN 211478445U
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Abstract
The utility model discloses a simple and easy input falls electric detection circuitry, belongs to the switching power supply field, including live wire end L, alternating current input N, rectifier bridge, first diode D1, first electric capacity C1, second electric capacity C2, public earthing terminal GND, zener diode ZD1, first resistance R1, second resistance R2, third resistance R3, power VC end and power POK end; the fire wire end L is electrically connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is electrically connected with the input end of the first diode D1; the output end of the first diode D1 is electrically connected with the input end of the first capacitor C1, and the output end of the first capacitor C1 is electrically connected with the common ground GND and the input end of the rectifier bridge respectively; the output end of the rectifier bridge is electrically connected with the alternating current input end N; the output end of the rectifier bridge is electrically connected with the input end of the voltage stabilizing diode ZD1, the same effect as the prior art is achieved through the design of a simple circuit, the cost is saved, and the practicability is high.
Description
Technical Field
The utility model relates to a switching power supply field, more specifically say, relate to a simple and easy input power failure detection circuit.
Background
The switching power supply is a power supply which utilizes modern power electronic technology to control the on-off time ratio of an activated switching tube and maintain stable output voltage, generally comprises a Pulse Width Modulation (PWM) control IC and a MOSFET, and is continuously innovated along with the development and innovation of the power electronic technology.
The traditional input power-off alarm signal is too complex, certain difficulty is brought to design and production, and the circuit solves the problem of input power-off alarm by using a very simple circuit.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
To the problem that exists among the prior art, the utility model aims to provide a simple and easy input falls electric detection circuitry, it reaches the effect the same with prior art through the design of simple circuit, has practiced thrift the cost, and the practicality is strong.
2. Technical scheme
In order to solve the above problem, the utility model adopts the following technical scheme:
a simple input power failure detection circuit comprises a live wire end L, an alternating current input end N, a rectifier bridge, a first diode D1, a first capacitor C1, a second capacitor C2, a common ground end GND, a voltage stabilizing diode ZD1, a first resistor R1, a second resistor R2, a third resistor R3, a power supply VC end and a power supply POK end;
the fire wire end L is electrically connected with the input end of a rectifier bridge, and the output end of the rectifier bridge is electrically connected with the input end of a first diode D1;
the output end of the first diode D1 is electrically connected with the input end of a first capacitor C1, and the output end of the first capacitor C1 is electrically connected with a common ground end GND and the input end of a rectifier bridge respectively;
the output end of the rectifier bridge is electrically connected with the alternating current input end N;
the output end of the rectifier bridge is electrically connected with the input end of a voltage stabilizing diode ZD1, the output end of the voltage stabilizing diode ZD1 is electrically connected with the input end of a first resistor R1, and the output end of the first resistor R1 is electrically connected with the output end of a second capacitor C2;
the output end of the second capacitor C2 is electrically connected with the input end of the second resistor R2 and the input end of the rectifier bridge respectively;
the output end of the second resistor R2 is electrically connected with the input end of a third resistor R3;
the output end of the third resistor R3 is electrically connected with the first input end of an optical coupler OP1, and the first output end of the optical coupler OP1 is electrically connected with the input end of a second resistor R2;
the power VC end is connected with the second input end electricity of opto-coupler OP1, the second output end of opto-coupler OP1 is connected with power POK end electricity, through the design of simple circuit, reaches the same effect with prior art, has practiced thrift the cost, and the practicality is strong.
As a preferred scheme of the utility model, the rectifier bridge includes two second diodes D2 and two third diodes D3, two second diodes D2 series connection, two third diodes D3 series connection, and two third diodes D3 after establishing ties and two second diodes D2 parallel connection after establishing ties.
As a preferable aspect of the present invention, the first capacitor C1 and the second capacitor C2 are both electrolytic capacitors.
As an optimized scheme of the utility model, opto-coupler OP1 includes fourth diode D4 and triode Q1, third resistance R3's output is connected with fourth diode D4's input electricity, fourth diode D4's output is connected with second resistance R2's input electricity, power VC end is connected with triode Q1's input electricity, triode Q1's output and power POK end electricity are connected.
As an optimized scheme of the utility model, triode Q1 is the phototriode.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
according to the scheme, a first diode D1 is additionally arranged between an arrangement bridge DB1 and a first capacitor C1, alternating current power loss warning is achieved, only power is supplied in front of the first diode D1, voltage is further reduced by a voltage-stabilizing diode ZD1 and then is charged to a second capacitor C2, an optical coupler OP1 is conducted, after alternating current power loss, the power POK end is at a high level, when alternating current is turned off, the second capacitor C2 discharges through a second resistor R2, after alternating current power loss is guaranteed, the power POK end can quickly become at a low level, meanwhile, if the power is in a no-load state at the moment, when the alternating current is turned off, the voltage on the first capacitor C1 is still high, at the moment, the voltage of the first capacitor C1 cannot charge the second capacitor C2 by utilizing the unidirectional conductivity of the first diode D1, and the power can be guaranteed that the state of an alternating current power loss warning signal can be quickly turned over when the power is turned off in the no-.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.
Example (b):
referring to fig. 1, a simple input power failure detection circuit includes a live wire terminal L, an ac input terminal N, a rectifier bridge DB1, a first diode D1, a first capacitor C1, a second capacitor C2, a common ground terminal GND, a zener diode ZD1, a first resistor R1, a second resistor R2, a third resistor R3, a power supply VC terminal, and a power supply POK terminal;
the live wire end L is electrically connected with the input end b of the rectifier bridge DB1, and the output end c of the rectifier bridge DB1 is electrically connected with the input end of the first diode D1;
the output end of the first diode D1 is electrically connected with the input end of the first capacitor C1, and the output end of the first capacitor C1 is electrically connected with the common ground GND and the input end a of the rectifier bridge DB1 respectively;
the output end d of the rectifier bridge DB1 is electrically connected with the alternating current input end N;
the output end C of the rectifier bridge DB1 is electrically connected with the input end of a voltage stabilizing diode ZD1, the output end of a voltage stabilizing diode ZD1 is electrically connected with the input end of a first resistor R1, and the output end of the first resistor R1 is electrically connected with the output end of a second capacitor C2;
the output end of the second capacitor C2 is respectively and electrically connected with the input end of the second resistor R2 and the input end a of the rectifier bridge;
the output end of the second resistor R2 is electrically connected with the input end of the third resistor R3;
the output end of the third resistor R3 is electrically connected with the first input end of the optical coupler OP1, and the first output end of the optical coupler OP1 is electrically connected with the input end of the second resistor R2;
the end of the power supply VC is electrically connected with the second input end of the optical coupler OP1, and the second output end of the optical coupler OP1 is electrically connected with the end of the power supply POK.
Specifically, the rectifier bridge DB1 includes two second diodes D2 and two third diodes D3, the two second diodes D2 are connected in series, the two third diodes D3 are connected in series, and the two series-connected third diodes D3 are connected in parallel with the two series-connected second diodes D2.
Specifically, the optocoupler OP1 includes a fourth diode D4 and a transistor Q1, an output end of the third resistor R3 is electrically connected to an input end of the fourth diode D4, an output end of the fourth diode D4 is electrically connected to an input end of the second resistor R2, a VC terminal of the power supply is electrically connected to an input end of the transistor Q1, and an output end of the transistor Q1 is electrically connected to a POK terminal of the power supply.
Preferably, the first capacitor C1 and the second capacitor C2 are both electrolytic capacitors, and the transistor Q1 is a photo transistor.
The working principle is as follows: the alternating current is added with a first diode D1 between the tidying bridge DB1 and the first capacitor C1, the alternating current is in power failure warning, only power is supplied in front of the first diode D1, the voltage is further reduced by a voltage-stabilizing diode ZD1 and then charges a second capacitor C2, an optical coupler OP1 is conducted, after the alternating current is in power failure, the POK end of the power supply is at a high level, when the alternating current is switched off, the capacitor of the second capacitor C2 is discharged through a second resistor R2, after the alternating current is guaranteed to be in power failure, the POK end of the power supply can be quickly changed into a low level, meanwhile, if the power supply is in a no-load state at the moment, when the alternating current is switched off, the voltage on the first capacitor C1 is still high, at the moment, the voltage of the first capacitor C1 cannot be charged to the second capacitor C2 by utilizing the unidirectional conductivity of the first diode D1, so that the state of the alternating current power failure warning signal can be quickly turned, the effect the same as that of the prior art is achieved, the cost is saved, and the practicability is high.
The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.
Claims (5)
1. The utility model provides a simple and easy input power failure detection circuit which characterized in that: the power supply comprises a live wire end (L), an alternating current input end (N), a rectifier bridge, a first diode (D1), a first capacitor (C1), a second capacitor (C2), a common ground end (GND), a voltage stabilizing diode (ZD1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a power supply VC end and a power supply POK end;
the live wire end (L) is electrically connected with the input end of a rectifier bridge, and the output end of the rectifier bridge is electrically connected with the input end of a first diode (D1);
the output end of the first diode (D1) is electrically connected with the input end of a first capacitor (C1), and the output end of the first capacitor (C1) is electrically connected with a common ground end (GND) and the input end of a rectifier bridge respectively;
the output end of the rectifier bridge is electrically connected with the alternating current input end (N);
the output end of the rectifier bridge is electrically connected with the input end of a voltage stabilizing diode (ZD1), the output end of the voltage stabilizing diode (ZD1) is electrically connected with the input end of a first resistor (R1), and the output end of the first resistor (R1) is electrically connected with the output end of a second capacitor (C2);
the output end of the second capacitor (C2) is electrically connected with the input end of the second resistor (R2) and the input end of the rectifier bridge respectively;
the output end of the second resistor (R2) is electrically connected with the input end of a third resistor (R3);
the output end of the third resistor (R3) is electrically connected with the first input end of an optical coupler (OP1), and the first output end of the optical coupler (OP1) is electrically connected with the input end of a second resistor (R2);
the power VC end is electrically connected with a second input end of an optical coupler (OP1), and a second output end of the optical coupler (OP1) is electrically connected with a power POK end.
2. A simple input power down detection circuit as claimed in claim 1, wherein: the rectifier bridge comprises two second diodes (D2) and two third diodes (D3), two second diodes (D2) are connected in series, two third diodes (D3) are connected in series, and two third diodes (D3) connected in series are connected with two second diodes (D2) connected in series in parallel.
3. A simple input power down detection circuit as claimed in claim 1, wherein: the first capacitor (C1) and the second capacitor (C2) are both electrolytic capacitors.
4. A simple input power down detection circuit as claimed in claim 1, wherein: the opto-coupler (OP1) includes fourth diode (D4) and triode (Q1), the output of third resistance (R3) is connected with the input electricity of fourth diode (D4), the output of fourth diode (D4) is connected with the input electricity of second resistance (R2), power VC end is connected with the input electricity of triode (Q1), the output and the power POK end electricity of triode (Q1) are connected.
5. The simple input power down detection circuit as claimed in claim 4, wherein: the triode (Q1) is a photo triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922312223.2U CN211478445U (en) | 2019-12-20 | 2019-12-20 | Simple input power failure detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922312223.2U CN211478445U (en) | 2019-12-20 | 2019-12-20 | Simple input power failure detection circuit |
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| CN211478445U true CN211478445U (en) | 2020-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922312223.2U Active CN211478445U (en) | 2019-12-20 | 2019-12-20 | Simple input power failure detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
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2019
- 2019-12-20 CN CN201922312223.2U patent/CN211478445U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922655A (en) * | 2021-10-18 | 2022-01-11 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starts and loses electric warning circuit and switching power supply |
| CN113922655B (en) * | 2021-10-18 | 2024-02-20 | 无锡市欧瑞杰电子科技有限公司 | PWM chip starting and power-off alarm circuit and switching power supply |
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