CN211043635U - Power failure detection circuit for input side of single-phase power supply - Google Patents
Power failure detection circuit for input side of single-phase power supply Download PDFInfo
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- CN211043635U CN211043635U CN201921582327.9U CN201921582327U CN211043635U CN 211043635 U CN211043635 U CN 211043635U CN 201921582327 U CN201921582327 U CN 201921582327U CN 211043635 U CN211043635 U CN 211043635U
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Abstract
The utility model relates to an electricity field of surveying discloses a single phase power supply input side power failure detection circuit, it includes electric capacity C1, electric capacity C2, electric capacity C3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, triode Q1, rectifier bridge DB1, resistance RT1, error amplifier U1, optoelectronic coupler U2. The utility model has the advantages that: compared with a power failure detection protection circuit composed of a traditional relay or a traditional contactor, the technical scheme not only can reduce the space occupied by the circuit and reduce the cost, but also can improve the reliability of a detection result, improve the anti-interference capability, obviously enhance the capability of coping with a poor industrial environment, reduce the complexity of software design, and also can reduce the personal safety hidden danger brought by direct strong current detection, so that the power electronic equipment can run more safely.
Description
Technical Field
The utility model relates to an electricity measures technical field, in particular to single phase power supply input side power down detection circuit.
Background
With the development of science and technology, power electronic equipment is widely applied and popularized in the fields of industrial control, power communication, intelligent instruments and the like. While power electronic devices are popularized, people have higher requirements on protection circuits, and input side power down protection is widely applied as common and important protection in the devices, and is particularly important for some devices which need to store user parameters or device parameters during power down. However, at present, most of the power failure protection devices are composed of relays and contactors, and are high in cost, poor in reliability and unsafe. Even if some devices provide detection circuits with small volume and low cost, the reliability and the detectable range of the devices have considerable defects, and the conditions of non-ideal isolation effect, state failure and the like are easy to occur.
SUMMERY OF THE UTILITY MODEL
For overcoming whole or partial defect among the prior art, the utility model provides a single phase power supply input side falls electric detection circuitry, and concrete implementation is realized through following technical scheme.
A power-down detection circuit of a single-phase power supply input side comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q1, a rectifier bridge DB1, a resistor RT1, an error amplifier U1 and a photoelectric coupler U2, and is characterized in that one end of the capacitor C1 is connected with an input side phase line L, the other end of the capacitor C2 is connected with an input side phase line N and the other end of the ground line PE, the resistor R1 is connected between the input side phase line L and the input side line N in parallel, the input side phase line L and the input side of the rectifier bridge DB L is connected with the positive side phase line L and the positive side RT 72, the output resistor RT L and the negative side L, the output side RT L is connected with the emitter of the triode R L, the emitter of the light-emitting diode R L, the emitter of the triode R72, the emitter of the emitter L, the emitter of the triode R L is connected with the triode R72, the light-emitting diode L, the emitter of the light-emitting diode R72, the emitter of the light-emitting diode L, the emitter of the light-emitting diode L, the emitter of the emitter L, the emitter of the emitter, the emitter of the emitter.
The utility model has the advantages that: compared with a power failure detection protection circuit composed of a traditional relay or a traditional contactor, the technical scheme not only can reduce the space occupied by the circuit and reduce the cost, but also can improve the reliability of a detection result, improve the anti-interference capability, obviously enhance the capability of coping with a poor industrial environment, reduce the complexity of software design, and also can reduce the personal safety hidden danger brought by direct strong current detection, so that the power electronic equipment can run more safely.
Drawings
Fig. 1 is a circuit diagram 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.
As shown in FIG. 1, the power down detection circuit for the input side of a single-phase power supply of the present embodiment includes an ampere-resistor C1, an ampere-resistor C2, a voltage-sensitive resistor R1, a rectifier bridge DB1, a charge buffer resistor RT1, a filter capacitor C3, a voltage-dividing resistor R2, a ground resistor R2, a positive terminal of the load resistor R36Q, a load resistor R2, a load resistor R36Q, a load resistor R2, a load resistor R-dividing resistor R2, a load resistor R-dividing resistor R2, a load resistor R-resistor R-N, a load resistor R-N-a load resistor, a load resistor R-N-resistor, a load resistor R-N-a load resistor, a load resistor R-N-resistor, a load resistor R-resistor, a load resistor R-resistor, a load resistor R-resistor, a load resistor R-resistor, a load resistor R-resistor, a load resistor.
The working principle is that when the input side L N is not powered down, the error amplifier works in a saturated conducting state because the resistance voltage division on the R5 exceeds 2.5V, the photoelectric coupler U2 is also in a conducting state, the emitter of the phototriode on the output side of the photoelectric coupler U2 outputs high level, when the L N side is powered down, the filter capacitor C3 starts to discharge, the voltage on the filter capacitor C3 starts to reduce, when the voltage division on the resistor R5 is reduced to be smaller than 2.5V, the photoelectric coupler U2 is turned off, the emitter 3 of the phototriode on the output side of the photoelectric coupler outputs low level, when the CPU receives the low level signal, the CPU judges that the input side is powered down, the CPU starts to store user parameters and equipment parameters, and the triode Q1 has the function of preventing the light coupling output signal from being unstable when the voltage division of the voltage division resistor R5 is just in a small range.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A power-down detection circuit of a single-phase power supply input side comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a triode Q1, a rectifier bridge DB1, a resistor RT1, an error amplifier U1 and a photoelectric coupler U2, and is characterized in that one end of the capacitor C1 is connected with an input side phase line L, the other end of the capacitor C2 is connected with an input side phase line N and the other end of the ground line PE, the resistor R1 is connected between the input side phase line L and the input side line N in parallel, the input side phase line L and the input side of the rectifier bridge DB L is connected with the positive side phase line L and the positive side RT 72, the output resistor RT L and the negative side L, the output side RT L is connected with the emitter of the triode R L, the emitter of the light-emitting diode R L, the emitter of the triode R72, the emitter of the emitter L, the emitter of the triode R L is connected with the triode R72, the light-emitting diode L, the emitter of the light-emitting diode R72, the emitter of the light-emitting diode L, the emitter of the light-emitting diode L, the emitter of the emitter L, the emitter of the emitter, the emitter of the emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582327.9U CN211043635U (en) | 2019-09-20 | 2019-09-20 | Power failure detection circuit for input side of single-phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921582327.9U CN211043635U (en) | 2019-09-20 | 2019-09-20 | Power failure detection circuit for input side of single-phase power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211043635U true CN211043635U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921582327.9U Active CN211043635U (en) | 2019-09-20 | 2019-09-20 | Power failure detection circuit for input side of single-phase power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899939A (en) * | 2021-12-10 | 2022-01-07 | 广东省新一代通信与网络创新研究院 | Power failure warning circuit and processing method for communication equipment and communication equipment |
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2019
- 2019-09-20 CN CN201921582327.9U patent/CN211043635U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113899939A (en) * | 2021-12-10 | 2022-01-07 | 广东省新一代通信与网络创新研究院 | Power failure warning circuit and processing method for communication equipment and communication equipment |
| CN113899939B (en) * | 2021-12-10 | 2022-03-29 | 广东省新一代通信与网络创新研究院 | Power failure warning circuit and processing method for communication equipment and communication equipment |
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