阅读说明：本技术 一种掉电告警电路 (A kind of power failure warning circuit ) 是由 刘伟伟 于 2018-05-17 设计创作，主要内容包括：本文公开了一种掉电告警电路,属于通信供电技术领域,包括：依次连接的输入隔离整流电路、比较电路和输出电路,所述输入隔离整流电路将输入电压信号隔离整流,得到整流电压信号并输出至所述比较电路,比较电路将所述整流电压信号与电压基准器件进行比较,输出电路根据所述比较电路的比较结果输出高低电平,通过分立元器件组成分立电路,实现了输入掉电自动告警的功能,便于运行维护,且成本较低。(Disclosed herein is a kind of power failure warning circuits, belong to power communications technical field, it include: sequentially connected input isolation rectification circuit, comparison circuit and output circuit, the input isolation rectification circuit is by input voltage signal isolation rectification, it obtains rectified voltage signal and exports to the comparison circuit, the rectified voltage signal is compared by comparison circuit with voltage reference device, output circuit exports low and high level according to the comparison result of the comparison circuit, discrete circuit is formed by discrete component, realize the function of input power down auto-alarming, convenient for operation and maintenance, and cost is relatively low.)

1. a kind of power failure warning circuit characterized by comprising sequentially connected input isolation rectification circuit, comparison circuit and Input voltage signal isolation rectification is obtained rectified voltage signal and exported extremely by output circuit, the input isolation rectification circuit The rectified voltage signal is compared by the comparison circuit, comparison circuit with voltage reference device, and output circuit is according to institute State the comparison result output low and high level of comparison circuit.

2. a kind of power failure warning circuit according to claim 1, which is characterized in that the input isolation rectification circuit packet It includes: resistance R1, resistance R2, optocoupler D1 and optocoupler D2, wherein one end of one end connection input voltage of the resistance R1, it is described The other end of one end connection input voltage of resistance R2, the cathode and light of the light emitting diode of the other end and optocoupler D1 of resistance R1 The anode connection of the light emitting diode of coupling D2, the anode of the light emitting diode of the other end and optocoupler D1 of resistance R2 and optocoupler D2's The cathode of light emitting diode connects.

3. a kind of power failure warning circuit according to claim 2, which is characterized in that the comparison circuit include: resistance R3, Resistance R4, capacitor C1 and voltage reference device D5, wherein the collector of the secondary side triode of one end and optocoupler D1 of resistance R4 and The collector of the secondary side triode of optocoupler D2 connects, and the other end of resistance R4 is connect with power end VCC, one end of capacitor C1 and light The secondary emitter in triode of coupling D1, optocoupler D2 it is secondary while the emitter of triode, one end of resistance R3 and voltage references The pin 3 of part D5 connects, and the other end of capacitor C1 and the pin 1 of the other end of resistance R3 and voltage reference device D5 connect together Ground.

4. a kind of power failure warning circuit according to claim 3, which is characterized in that the output circuit include: resistance R5, Resistance R6, resistance R7 and triode Q1, wherein one end of resistance R5 is connect with power end VCC, the other end and resistance of resistance R5 The pin 2 of one end of R6 and voltage reference device D5 connect, the other end of resistance R6 and one end of resistance R7 and triode Q1's Base stage connection, the emitter of triode Q1 are grounded together with the other end of resistance R7, and the collector of triode Q1 connects warning end ALM。

5. a kind of power failure warning circuit according to claim 3, which is characterized in that the model of the voltage reference device D5 For ZR431.

6. a kind of power failure warning circuit according to claim 2, which is characterized in that the comparison circuit include: resistance R3, Resistance R4, capacitor C1, voltage reference device D3 and comparator D5, wherein one end of resistance R4 and the secondary side triode of optocoupler D1 Collector and optocoupler D2 secondary side triode collector connection, the other end of resistance R4 connect with power end VCC, capacitor C1 One end and the secondary emitter in triode of optocoupler D1, optocoupler D2 it is secondary while the emitter of triode, resistance R3 one end and The positive input terminal of comparator D5 connects, the other end of the other end of capacitor C1 and resistance R3, one end of voltage reference device D3 and The negative power end of comparator D5 is grounded together, and the other end of voltage reference device D3 and the negative input end of comparator connect, and is compared The positive power source terminal of device connects power end VCC.

7. a kind of power failure warning circuit according to claim 6, which is characterized in that the model of the voltage reference device D3 For ZR431；The model 2903 of the comparator D5.

8. a kind of power failure warning circuit according to claim 6, which is characterized in that the output circuit include: resistance R5, Resistance R6, resistance R7 and triode Q1, wherein one end of resistance R5 is connect with power end VCC, the other end and resistance of resistance R5 The base stage of one end of R6 and the output end connection of comparator D5, the other end of resistance R6 and one end of resistance R7 and triode Q1 connect It connects, the emitter of triode Q1 is grounded together with the other end of resistance R7, and the collector of triode Q1 connects warning end ALM.

9. according to a kind of described in any item power failure warning circuits of claim 3-8, which is characterized in that the power end VCC with Power supply circuit connection.

10. a kind of power failure warning circuit according to claim 9, which is characterized in that when input voltage signal is normal, electricity Road works normally, and power end VCC is charged by the secondary side triode of resistance R4 and optocoupler D1, D2 to capacitor C1, the electricity of capacitor C1 The flat voltage reference value higher than voltage reference device, output circuit export low level to warning end ALM；When input voltage power down When, output circuit exports high level to warning end ALM, triggering alarm.

Technical field

Present document relates to power communications technical field more particularly to a kind of power failure warning circuits.

Background technique

In existing communication system, communication equipment alarm is the additional function of monitoring of tools, but for base station, power down Alarm function is critically important, and the equipment that service provider also requires equipment manufacturer to produce at present supports the function.To be covered for interior For the base station of lid, which mostly uses AC power supply, and in-door covering mounting condition is limited, is not equipped with special computer room generally And environmental monitoring unit, in this case, the base station service quit that remote supervisory station monitors may there are many reasons, such as: base station Transmission port failure, transmission network intermediate equipment failure, base station software cause Operation and maintenance link chain rupture, base station powered-off fault extremely Deng due to not knowing base station service quit remote supervisory station, needing to check step by step, be unfavorable for O&M.In order to accurately report by The base station service quit caused by unit exception power down is convenient for the quick worksheet processing troubleshooting of O&M, it is desirable that base station has power fail warning function.

Summary of the invention

It is to provide a kind of power failure warning circuit herein, discrete circuit is formed by discrete component, input is realized and falls The function of electric auto-alarming is convenient for operation and maintenance, and cost is relatively low.

It is as follows that technical solution used by above-mentioned technical problem is solved herein:

According to the one aspect of this paper, a kind of power failure warning circuit for providing, comprising: sequentially connected input isolation rectification Input voltage signal isolation rectification is obtained rectified current by circuit, comparison circuit and output circuit, the input isolation rectification circuit It presses signal and exports to the comparison circuit, the rectified voltage signal is compared by comparison circuit with voltage reference device, Output circuit exports low and high level according to the comparison result of the comparison circuit.

Optionally, the input isolation rectification circuit includes: resistance R1, resistance R2, optocoupler D1 and optocoupler D2, wherein institute State one end of one end connection input voltage of resistance R1, the other end of one end connection input voltage of the resistance R2, resistance R1 The anode of the other end and the light emitting diode of the cathode of the light emitting diode of optocoupler D1 and optocoupler D2 connect, resistance R2's is another End is connect with the cathode of the anode of the light emitting diode of optocoupler D1 and the light emitting diode of optocoupler D2.

Optionally, the comparison circuit includes: resistance R3, resistance R4, capacitor C1 and voltage reference device D5, wherein electricity Hinder the secondary collector and optocoupler D2 in triode of one end and the optocoupler D1 of R4 it is secondary while triode collector connect, resistance R4 The other end connect with power end VCC, the secondary emitter in triode of one end of capacitor C1 and optocoupler D1, optocoupler D2 it is secondary while The pin 3 of the emitter of triode, one end of resistance R3 and voltage reference device D5 connects, the other end and resistance R3 of capacitor C1 The other end and the pin 1 of voltage reference device D5 be grounded together.

Optionally, the output circuit includes: resistance R5, resistance R6, resistance R7 and triode Q1, wherein resistance R5's One end is connect with power end VCC, and the other end of resistance R5 is connect with the pin 2 of one end of resistance R6 and voltage reference device D5, The other end of resistance R6 is connect with the base stage of one end of resistance R7 and triode Q1, and the emitter of triode Q1 is another with resistance R7's One end is grounded together, and the collector of triode Q1 connects warning end ALM.

Optionally, the model ZR431 of the voltage reference device D5.

Optionally, the comparison circuit includes: resistance R3, resistance R4, capacitor C1, voltage reference device D3 and comparator D5, wherein the secondary collector and optocoupler D2 in triode of one end of resistance R4 and optocoupler D1 it is secondary while triode collector Connection, the other end of resistance R4 are connect with power end VCC, the emitter of the secondary side triode of one end and optocoupler D1 of capacitor C1, The positive input terminal connection of the emitter of secondary side triode of optocoupler D2, one end of resistance R3 and comparator D5, capacitor C1's is another End is grounded together with the negative power end of the other end of resistance R3, one end of voltage reference device D3 and comparator D5, voltage reference The other end of device D3 and the negative input end of comparator connect, and the positive power source terminal of comparator connects power end VCC.

Optionally, the model ZR431 of the voltage reference device D3；The model 2903 of the comparator D5.

Optionally, the output circuit includes: resistance R5, resistance R6, resistance R7 and triode Q1, wherein resistance R5's One end is connect with power end VCC, and the other end of resistance R5 is connect with the output end of one end of resistance R6 and comparator D5, resistance R6 The other end connect with the base stage of one end of resistance R7 and triode Q1, the other end one of the emitter of triode Q1 and resistance R7 Ground connection is played, the collector of triode Q1 connects warning end ALM.

Optionally, the power end VCC is connect with power supply circuit.

Optionally, when input voltage signal is normal, circuit work normally, power end VCC by resistance R4 and optocoupler D1, The secondary side triode of D2 charges to capacitor C1, and the level of capacitor C1 is higher than the voltage reference value of voltage reference device, output circuit Low level is exported to warning end ALM；When input voltage power down, output circuit exports high level to warning end ALM, and triggering is accused It is alert.

A kind of power failure warning circuit of the embodiment of the present invention, comprising: sequentially connected input isolation rectification circuit, comparison are electric Input voltage signal isolation rectification is obtained rectified voltage signal and defeated by road and output circuit, the input isolation rectification circuit Out to the comparison circuit, the rectified voltage signal is compared by comparison circuit with voltage reference device, output circuit root Low and high level is exported according to the comparison result of the comparison circuit, discrete circuit is formed by discrete component, input is realized and falls The function of electric auto-alarming is convenient for operation and maintenance, and cost is relatively low.

Detailed description of the invention

Fig. 1 is a kind of functional schematic for power failure warning circuit that the embodiment of the present invention one provides；

Fig. 2 is a kind of circuit diagram for power failure warning circuit that the embodiment of the present invention one provides；

Fig. 3 is the circuit diagram for another power failure warning circuit that the embodiment of the present invention one provides；

Fig. 4 is a kind of circuit diagram of power failure warning circuit provided by Embodiment 2 of the present invention.

The embodiments will be further described with reference to the accompanying drawings for realization, functional characteristics and the advantage of this paper purpose.

Specific embodiment

In order to be clearer and more clear this paper technical problem, technical solution and beneficial effect to be solved, below in conjunction with Drawings and examples, to being further elaborated herein.It should be appreciated that specific embodiment described herein is only used to It explains herein, is not used to limit herein.