CN201708538U

CN201708538U - Earth leakage projection device for high frequency interference resistance of home appliances during starting

Info

Publication number: CN201708538U
Application number: CN2010202357152U
Authority: CN
Inventors: 王赵
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-24
Filing date: 2010-06-24
Publication date: 2011-01-12
Anticipated expiration: 2020-06-24

Abstract

The utility model provides an earth leakage projection device for high frequency interference resistance of home appliances during starting, which comprises an earth leakage sensing circuit, an earth leakage detecting circuit, a power switch unit and a pulse train preventing circuit. The earth leakage sensing circuit is connected with the earth leakage detecting circuit and used for sensing earth leakage signals and converting the current signals into voltage signals transmitted to the earth leakage detecting circuit, the earth leakage detecting circuit is used for filtering, amplifying and rectifying the received earth leakage signals to obtain direct-current voltage inputted into the power switch unit, an input end of the pulse train preventing circuit is connected with mains supply, and an output end of the pulse train preventing circuit is respectively connected with an input end of the earth leakage sensing circuit and an input end of the power switch unit. After mains supply electricity passes through the pulse train preventing circuit, transient high voltage of a thunderbolt enters a family after being lowered to be harmless to user' equipment, and thereby the earth leakage projection device can achieve the effect of well protecting the user' electric equipment.

Description

The earth leakage protective device of anti-High-frequency Interference when being used for the household electrical appliance startup

Technical field:

The utility model relates to a kind of earth leakage protective device, relates in particular to a kind of anti-6000V impulse train earth leakage protective device, belongs to the appliance switch technical field.

Background technology:

Along with improving constantly of people's quality of life, electronics, electric equipment products have entered huge numbers of families, are also progressively strengthening for the protection person and the awareness of safety of equipment, and the requirement to protector of all kinds simultaneously also improves constantly.

The present employed earth leakage circuit-breaker overwhelming majority of China is to cross the earth leakage circuit-breaker of 4000V impulse train; stipulate according to the GB16017 GB; the earth leakage circuit-breaker that general family uses all requirement can be crossed the 4000V impulse train; reason is because the earth leakage circuit-breaker that general family uses is first protection switch that civil power advances subscriber household; when thunder and lightning appears in electric circumstance; thunder and lightning is easy to advance the user by transmission ﹠ distribution line circuit string; if this of short duration high pressure string advances user's electric equipment; will damage the power consumption equipment of family, bring loss to the user.But the voltage of thunder and lightning is higher than 4000V far away sometimes, so in order well to protect user's power consumption equipment, we have designed this can cross the earth leakage circuit-breaker of 6000V impulse train.

In the prior art, the earth leakage circuit-breaker of general use can only be accomplished anti-4000V impulse train, and when this impulse train is high again, damaging just appears in this earth leakage circuit-breaker.

The utility model content

The utility model purpose:

Technical problem to be solved of the present utility model is the defective that exists at above-mentioned prior art, and a kind of earth leakage protective device of anti-High-frequency Interference when being used for household electrical appliance and starting is provided.

Technical scheme:

The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:

The earth leakage protective device of anti-High-frequency Interference comprises the electric leakage sensor circuit, electric-leakage detection circuit, power switch unit when being used for the household electrical appliance startup; Described electric leakage sensor circuit is connected with electric-leakage detection circuit, the electric leakage signal that electric-leakage detection circuit is used for receiving is through filtering, amplification and rectification obtain a direct voltage and input to described power switch unit, also comprise anti-impulse train circuit, the input of described anti-impulse train circuit is electrically connected with the city, and the output of anti-impulse train circuit is connected with the input of electric leakage sensor circuit, the input of power switch unit respectively.

Further, above-mentioned when being used for household electrical appliance and starting the anti-impulse train circuit of earth leakage protective device of anti-High-frequency Interference comprise electromagnet DCT, the first piezo-resistance V1, the second piezo-resistance V2; Wherein electromagnet DCT is formed by forward and backward two groups of coils series connection, and wherein an end of the front end coil of electromagnet DCT is connected with the L line of civil power, and the other end of front end coil is connected with an end of the rear end coil of the end of the first piezo-resistance V1, electromagnet DCT respectively; The other end of the first piezo-resistance V1 is connected with the N line of civil power, the end of the second piezo-resistance V2 respectively, and the other end of the second piezo-resistance V2 connects the other end of the rear end coil of electromagnet DCT.

Further, above-mentioned when being used for household electrical appliance and starting the earth leakage protective device electric-leakage detection circuit of anti-High-frequency Interference adopt non-time-delay residual current circuit breaker chip IC 54123.

Beneficial effect:

By after preventing the impulse train circuit, the formed instantaneous pressure of thunder and lightning drops to not damage and enters subscriber household below the subscriber equipment again with civil power, can play the effect of good protection user's power consumption equipment.The utility model uses two pressure-sensitive schemes by electromagnet being made the twin coil form, can be good at playing the effect of anti-6000V impulse train.

Description of drawings:

Fig. 1 is a circuit block diagram of the present utility model.

Fig. 2 is a circuit theory schematic diagram of the present utility model.

Number in the figure: V1, first piezo-resistance; V2, second piezo-resistance; DCT, electromagnet; GL1, full-bridge rectification equipment; U1, non-time-delay residual current circuit breaker chip IC 54123; P1, power switch unit; ZCT, electric leakage sensor circuit; C1～C8 is electric capacity; R1～R5 is resistance; D1, diode.

Specific embodiments:

Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:

As shown in Figure 1, the utility model comprises electric leakage sensor circuit, electric-leakage detection circuit, power switch unit; Described electric leakage sensor circuit is connected with electric-leakage detection circuit, the electric leakage signal that electric-leakage detection circuit is used for receiving is through filtering, amplification and rectification obtain a direct voltage and input to described power switch unit, also comprise anti-impulse train circuit, the input of described anti-impulse train circuit is electrically connected with the city, and the output of anti-impulse train circuit is connected with the input of electric leakage sensor circuit, the input of power switch unit respectively.

As shown in Figure 2; earth leakage protective device of the present utility model comprises electric leakage inductor ZCT; electric-leakage detection circuit (adopting non-time-delay residual current circuit breaker chip IC 54123), power switch unit P1, anti-impulse train circuit: electromagnet DCT, the first piezo-resistance V1, the second piezo-resistance V2.Under the normal condition, line voltage remains on 230V ± 10V, but when running into weather environment and the situation of thunder and lightning occurs, thunder and lightning can advance in the user family by number wiring circuit strings, and anti-impulse train circuit just can well play effect here.Prevent of the damage of this instantaneous pressure to power consumption equipment.

Concrete operation principle is as follows:

After civil power advanced to prevent the impulse train circuit, voltage can not surpass the voltage 560V of V2, when the high pressure thunder and lightning on the civil power passes through to prevent the impulse train circuit, effect by DCT coil and pressure-sensitive V1 can drop to 1000V with voltage, and then this voltage is being dropped to (560V) below the operating voltage of V2 by rear end coil and the V2 acting in conjunction of DCT, pass through the step-down and the full-bridge rectification equipment GL1 of resistance R 5 again, obtain a direct voltage, this direct voltage ensures to the stable power supply of earth leakage protective chip, ZCT is the electric leakage inductor, when the power consumption equipment in the family or personnel cause electric leakage, ZCT will respond to an electrical leakage voltage, the electric leakage sensor circuit comprises electric leakage inductor ZCT, be connected across the diode D1 of two reverse parallel connections of electric leakage inductor ZCT voltage output end, capacitor C 4, sample resistance R2 and current-limiting resistance R3, when the voltage signal of sensing as electric leakage inductor ZCT is higher than 0.7V, play a good restraining effect by these two diodes, thereby the above voltage signal of restriction 0.7V is transferred to chip and defective chip; The effect of sample resistance R2 is that the voltage signal of electric leakage inductor induction will pass through this sample resistance, the required voltage grade is transferred to the chip the inside, thereby reaches the rated value of regulating the leakage current action; Acting as by this resistance of current-limiting resistance R3 can be limited to certain scope with the electric current of electric leakage inductor induction, thereby prevents that excessive current delivery is to the chip the inside and defective chip plays the effect of protection chip; C4 act as anti-electromagnetic interference; because the electrical type consumer goods that use are more and more now; electromagnetic radiation is very common in the middle of our daily life, because electromagnetic radiation causes the earth leakage circuit-breaker tripping operation, C4 electric capacity can be good at the signal absorption with electromagnetic radiation in order to prevent.And capacitor C 2 is to design for anti-Japanese light modulation starts specially, and capacitor C 2 is a high frequency absorption electric capacity.

Electric-leakage detection circuit adopts non-time-delay residual current circuit breaker chip IC 54123, and this chip includes 8 pin, wherein, pin 1 and pin 2 are for detecting the electrical leakage voltage input, connect high frequency absorption capacitor C 2,3 pin and 8 pin are power end on these two pin, 5 pin are for latching pin, 6 pin are anti-interference (external capacitor C6 is anti-interference), and 4 pin of chip and 7 pin are output pin, and pin 4 is by capacitor C 7 ground connection, and pin 7 is used for output dc voltage and gives P1 (controllable silicon), make the P1 conducting, cut off circuit.

It should be noted that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1. the earth leakage protective device of anti-High-frequency Interference comprises the electric leakage sensor circuit, electric-leakage detection circuit, power switch unit when being used for the household electrical appliance startup; Described electric leakage sensor circuit is connected with electric-leakage detection circuit, the electric leakage signal that electric-leakage detection circuit is used for receiving is through filtering, amplification and rectification obtain a direct voltage and input to described power switch unit, it is characterized in that: also comprise anti-impulse train circuit, the input of described anti-impulse train circuit is electrically connected with the city, and the output of anti-impulse train circuit is connected with the input of electric leakage sensor circuit, the input of power switch unit respectively.

2. the earth leakage protective device of anti-High-frequency Interference when being used for household electrical appliance and starting according to claim 1, it is characterized in that: described anti-impulse train circuit comprises electromagnet DCT, the first piezo-resistance V1, the second piezo-resistance V2; Wherein electromagnet DCT is formed by forward and backward two groups of coils series connection, and wherein an end of the front end coil of electromagnet DCT is connected with the L line of civil power, and the other end of front end coil is connected with an end of the rear end coil of the end of the first piezo-resistance V1, electromagnet DCT respectively; The other end of the first piezo-resistance V1 is connected with the N line of civil power, the end of the second piezo-resistance V2 respectively, and the other end of the second piezo-resistance V2 connects the other end of the rear end coil of electromagnet DCT.

3. the earth leakage protective device of anti-High-frequency Interference when being used for household electrical appliance and starting according to claim 1, it is characterized in that: described electric-leakage detection circuit adopts non-time-delay residual current circuit breaker chip IC 54123.