CN202210115U

CN202210115U - Residual current signal measuring circuit based on controlled silicon protection

Info

Publication number: CN202210115U
Application number: CN2011203525662U
Authority: CN
Inventors: 严睿; 陈志伟; 徐剑
Original assignee: Delixi Electrical Appliance Co Ltd Zhejiang
Current assignee: Zhejiang DELIXI Electrical Co., Ltd.
Priority date: 2011-09-20
Filing date: 2011-09-20
Publication date: 2012-05-02
Anticipated expiration: 2021-09-20

Abstract

The utility model relates to a residual current signal measuring circuit on a leakage circuit breaker product. The utility model adopts the following technical scheme that: the residual current signal measuring circuit based on controlled silicon protection is characterized by comprising an n-shaped filtering return circuit at a signal end and a resistance-capacitance absorption protective return circuit at a power supply end; wherein input signals pass through an adjusting resistor Rt, a amplitude limit protection diode D1 and the n-shaped filtering return circuit and then enter a gate pole pin 3 of a silicon controlled rectifier (SCR); and the resistance-capacitance absorption protective return circuit consisting of a resistor R4 and a capacitor C4 at the power supply end is directly connected in parallel between a negative pole pin 1 and a positive pole pin 2 of the SCR. Due to the adoption of the scheme, the utility model overcomes the defects of the prior art, and provides the residual current signal measuring circuit based on the controlled silicon protection, which greatly improves anti-jamming capability of the leakage circuit breaker product at a residual current signal input end and the anti-surge capability at the power supply end and can reliably normally work in relatively harsh electrical environment.

Description

A kind of based on protection silicon controlled residual current circuitry for signal measurement

Technical field

The utility model relates to the residual current circuitry for signal measurement on the RCCB product, particularly relates to a kind of sampling A of not leaking electricity and depends merely on the conducting of triggering controllable silicon simultaneously based on protection silicon controlled circuit.

Background technology

When reducing because of aging circuit or electrical insulation properties in the electric process; Because insulation resistance is crossed conference and is produced corresponding leakage current; When human body directly contacted these consumers, residual electricity failed to be convened for lack of a quorum and flows to the earth (promptly get an electric shock) through human body and cause very big harm to the person.RCCB is exactly to have detected electric leakage or get an electric shock when taking place one, thereby power supply is broken off protection life safety with the extremely short time.Conventional RCCB product generally is to make the controllable silicon conducting through triggering the silicon controlled gate pole, and the trip gear that the tripping coil that is connected on power end this moment is started working on the pulling product breaks off power supply.Residual current signals collecting one end generally has special-purpose electric leakage chip (hereinafter to be referred as integrated) and directly gathers dual mode; And integrated Acquisition Circuit cost is high, the circuit relative complex; The electricity consumption occasion that is used to have relatively high expectations, routine are main with the circuit of direct acquisition mode still more.But the Acquisition Circuit on the product of market is a simple filtering circuit, and the anti surge voltage ability of the effectively undesired signal of filtered signal input end, and power end is relatively poor, under harsh power utilization environment, occurs malfunction easily or damages phenomenon.

Fig. 1 is depicted as the circuit that existing general residual current is directly measured; Owing to have only the simple filtering of electric capacity; And in the signal end parallel connection is normal schottky diode; Except effective filtering interference signals, diode under harsh power utilization environment because forward voltage is low, thereby frequent conducting punctures easily and makes product failure.

Fig. 2 is depicted as now the direct metering circuit of residual current preferably, and diode changes stabilivolt into, and the filtering end also adopts the filtering of two-stage π type, but some specific oscillating current is disturbed still filtering fully, and power end lacks the antisurge holding circuit.

Summary of the invention

The utility model overcomes the deficiency that prior art exists; Provide a kind of RCCB product that makes to be greatly improved at the antijamming capability of residual current signal input part and the antisurge ability of power end, under harsher power utilization environment also reliably operate as normal based on protection silicon controlled residual current circuitry for signal measurement.

In order to realize above purpose; The utility model adopts following technical scheme; A kind of based on protection silicon controlled residual current circuitry for signal measurement; The Signal Regulation resistance R t, limited amplitude protection diode D1, signal attenuation resistance R 3, the controllable silicon SCR that comprise input end; It is characterized in that: the capacitor C 1, capacitor C 2, capacitor C 3, resistance R 1, the π type filter circuit of resistance R 2 compositions and the capacitance-resistance that power end resistance R 4, capacitor C 4 are formed that also comprise signal end absorb the protection loop; Wherein input signal enters into the gate pole pin 3 of controllable silicon SCR through regulating resistance R t, limited amplitude protection diode D1 behind the π type filter circuit, and the capacitance-resistance that power end resistance R 4, capacitor C 4 are formed absorbs 2 on negative electrode pin 1 and the anode pin that the protection loop directly is attempted by controllable silicon SCR.

Adopt the beneficial effect of such scheme to be: circuit is simple and reliable, with low cost, antijamming capability is strong.Can effectively prevent controllable silicon reception rub-out signal and cause misoperation; And the antisurge ability to power end has greatly improved; Be applicable to that the sampling A of not leaking electricity depends merely on the circuit that triggers the controllable silicon conducting, such as in the circuit such as discrete electric sub-member plate on RCCB very effectively and practical.

The further setting of the utility model is: described Signal Regulation resistance R t is fixed resistance or variable resistor; Described limited amplitude protection diode D1 is a voltage stabilizing diode; Described resistance R 1, resistance R 2, resistance R 3, resistance R 4 are fixed resistance or variable resistor; Described capacitor C 1, capacitor C 2, capacitor C 3 are polarity free capacitors, and described capacitor C 4 is nonpolarity CBB21 or CBB22 high-voltage capacitance.

Below in conjunction with accompanying drawing the utility model is described further.

Description of drawings

The electrical block diagram that Fig. 1 directly measures for existing general residual current;

Fig. 2 is the direct metering circuit structural representation of residual current preferably now;

Fig. 3 is the electrical block diagram of the utility model embodiment.

Embodiment

As shown in Figure 3; A kind of based on protection silicon controlled residual current circuitry for signal measurement; The Signal Regulation resistance R t, limited amplitude protection diode D1, the signal attenuation resistance R 3 that comprise input end; Controllable silicon SCR in the utility model embodiment, comprises that also the π type filtering of signal end capacitor C 1, capacitor C 2, capacitor C 3, resistance R 1, resistance R 2 compositions and the resistance R 4 of power end, the capacitance-resistance that capacitor C 4 is formed absorb the protection loop.Input signal enters into the gate pole pin 3 of controllable silicon SCR through regulating resistance R t, limited amplitude protection diode D1 behind the π type filter circuit, the capacitance-resistance that power end R4, C4 form absorbs 2 on negative electrode pin 1 and the anode pin that the protection loop directly is attempted by controllable silicon SCR.Wherein resistance R t plays the Signal Regulation effect, can select according to the residual current signal magnitude.Limited amplitude protection diode D1 is a voltage stabilizing diode, plays clamping action, and voltage stabilizing value specification is fixed.Resistance R 1, resistance R 2, resistance R 3, resistance R 4 can be to satisfy the fixed resistance or the variable resistor of power consumption and requirement of withstand voltage, and its resistance and power are selected according to the residual current signal magnitude, need coupling silicon controlled trigger current gear.Capacitor C 1, capacitor C 2, capacitor C 3 are polarity free capacitors, and its electric capacity and withstand voltage calculate according to the circuit needs.Capacitor C 4 is nonpolarity CBB21 or CBB22 high-voltage capacitance, and the capacity of electric capacity and withstand voltage need calculate.

In the utility model embodiment, the undesired signals such as spike burr of the effective filtered signal end of ability in reliable acquired signal of the multistage π type filter circuit in the circuit prevent that controllable silicon from receiving rub-out signal and causing misoperation.The capacitance-resistance absorption circuit can improve the antisurge ability of power end, makes product also operate as normal reliably under harsher power utilization environment.

Claims

1. one kind based on protection silicon controlled residual current circuitry for signal measurement; The Signal Regulation resistance R t, limited amplitude protection diode D1, signal attenuation resistance R 3, the controllable silicon SCR that comprise input end; It is characterized in that: the capacitor C 1, capacitor C 2, capacitor C 3, resistance R 1, the π type filter circuit of resistance R 2 compositions and the capacitance-resistance that power end resistance R 4, capacitor C 4 are formed that also comprise signal end absorb the protection loop; Wherein input signal is through regulating resistance R t, limited amplitude protection diode D1; Enter into the gate pole pin 3 of controllable silicon SCR behind the π type filter circuit, the capacitance-resistance that power end resistance R 4, capacitor C 4 formed absorbs 2 on negative electrode pin 1 and the anode pin that the protection loop directly is attempted by controllable silicon SCR.

2. according to claim 1 a kind of based on protection silicon controlled residual current circuitry for signal measurement, it is characterized in that: described Signal Regulation resistance R t is fixed resistance or variable resistor.

3. according to claim 1 and 2 a kind of based on protection silicon controlled residual current circuitry for signal measurement; It is characterized in that: described limited amplitude protection diode D1 is a voltage stabilizing diode; Described resistance R 1, resistance R 2, resistance R 3, resistance R 4 are fixed resistance or variable resistor; Described capacitor C 1, capacitor C 2, capacitor C 3 are polarity free capacitors, and described capacitor C 4 is nonpolarity CBB21 or CBB22 high-voltage capacitance.