CN2231829Y

CN2231829Y - Multifunctional safety switch

Info

Publication number: CN2231829Y
Application number: CN 95210084
Authority: CN
Inventors: 于成才
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-10
Filing date: 1995-05-10
Publication date: 1996-07-24
Anticipated expiration: 2005-05-10

Abstract

The utility model relates to an emergency protective circuit, comprising a casing, an executive circuit, a flip-flop circuit, a short circuit, an overload detection circuit, an electric shock and electric leakage detecting circuit, a detection circuit which adopts a current limiting transformer B1 and a zero order transformer B2, a detection sampling short circuit, overload signals, and electric shock and electrical leakage signals. The emergency protective circuit device adopts a voltage doubler rectifier circuit to trigger a thyristor SCR, which enables the thyristor SCR to conduct, and a trip TQ gets electricity to attract. Thus, a switch switches off, and a load power supply is cut off. The emergency protective circuit device is provided with complete electronic circuits, and does not consume power in normal use. The utility model has the advantages of high sensitivity of the complete machine, complete functions, big adjustable range, and high safety.

Description

Multi-functional discharge cock

The utility model relates to a kind of emergency protective circuit device.

Along with the development of the electronics industry of China, various household electrical appliance enter huge numbers of families, but have also brought the human casualty accident that causes because of electric apparatus quality or because of improper use thereupon.Therefore the technology and the patent of various emergency protective circuits occur in succession.At first requiring as civilian emergency protective circuit device is to guarantee safety, be active in one's movements, and good reliability, secondly requiring is that circuit is simple, low price is preferably multiple functional.So in present existing emergency protective circuit technology, possess the few of above condition, therefore in promotion and implementation, bring certain degree of difficulty.

The purpose of this utility model is to realize a kind of multi-functional discharge cock, and this device is safe and reliable as the emergency protective circuit device, highly sensitive, and circuit is simple, and low price is multiple functional.

Main points of the present utility model are that this multi-functional discharge cock includes housing, executive circuit, circuits for triggering, short circuit, overload detection circuit, touches electric-leakage detection circuit.By short circuit, overload detection circuit, touch electric-leakage detection circuit detect the sampling short circuit, transship, touch electric leakage signal; when detect short circuit, transship, when touching electric leakage signal; but the controllable silicon SCR in the circuits for triggering; make the controllable silicon SCR conducting; and the release TQ in the executive circuit is worked; switch is disconnected, cut off the power supply of power consumption equipment, carry out short circuit, current limliting, touch, earth leakage protective.

Be elaborated below in conjunction with accompanying drawing.

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

As shown in Figure 1, this multi-functional discharge cock includes housing, executive circuit, circuits for triggering, short circuit, overload detection circuit, it is characterized in that described executive circuit be adopt release TQ to work to control two respectively with power input A, the moving contact that zero-power line end N connects, one end of the coil of this release TQ meets described power input A by diode D5, the anode of the controllable silicon SCR of the described circuits for triggering of another termination, the negative electrode of this controllable silicon SCR meets the load zero line side N ' of alternating current, described short circuit, overload detection circuit is to adopt current limliting instrument transformer B1 to detect the sampling short circuit, overload signal, the elementary winding L 1 of this current limliting instrument transformer B1 be connected on described power input A and load output terminals A ' between, two termination variable resistor WR of its secondary winding L 2, the centre cap of this variable resistor WR connects by diode D1, the current rectifying and wave filtering circuit that capacitor C 1 is formed, the short circuit of this current rectifying and wave filtering circuit, the output of overload detection signals is by voltage-stabiliser tube DW, resistance R 1 in the described circuits for triggering connects the control utmost point of described controllable silicon SCR.Rotation variable resistor WR can change the amplitude (being the current value of power consumption equipment) of detection signal.When power connection, the elementary winding L 1 of current limliting instrument transformer B1 be serially connected in power input A and load output terminals A ' between, when electric current passes through, its secondary winding L 2 has induced current, signal voltage compares with voltage-stabiliser tube DW breakdown value after variable resistor WR dividing potential drop, diode D1 rectification, capacitor C 1 filtering, and its value is slightly less than the breakdown value of voltage-stabiliser tube DW, voltage-stabiliser tube DW does not have electric current to pass through, and this discharge cock is stabilized in this kind state.Power supply is normally powered to power consumption equipment.When power consumption equipment is short-circuited, overcurrent and user arbitrarily increase power consumption, when having surpassed original normal value, voltage-stabiliser tube DW is breakdown; anti-time limit characteristic according to current protection; through resistance R 1, after capacitor C 5 filtering, trigger controllable silicon SCR; make the controllable silicon SCR conducting; the coil of release TQ gets electric adhesive, makes its moving contact action on two, thereby switch is disconnected; cut off load power, carry out short circuit, current-limiting protection.

As shown in Figure 1, two terminations of the release TQ in executive circuit protection diode D4.In circuits for triggering, on the tie point of the control utmost point of controllable silicon SCR, resistance R 1 and be provided with filter capacitor C5 between the load zero line side N '.Between the controllable silicon SCR resistance utmost point and negative electrode, connect capacitor C 6 and resistance R 2.

As shown in Figure 1, this multi-functional discharge cock also comprises and touching, electric-leakage detection circuit, this touches electric-leakage detection circuit is to adopt zero-sequence transformer B2 to detect sampling to touch, electric leakage signal, the elementary winding L 4 of this zero-sequence transformer B2, L3 be two-wire and around, be located at respectively power input A and load output terminals A ' between, and between zero-power line end N and the load zero line side N ', two terminations of its secondary winding L 5 are by capacitor C 2, diode D2, D3, capacitor C 3, the voltage multiplying rectifier that C4 forms, filter circuit, this voltage multiplying rectifier, touching of filter circuit, the output of electric leakage signal joins by the control utmost point of the resistance R in the described circuits for triggering 1 with described controllable silicon SCR.When power connection, zero-sequence transformer B2 primary coil L3, L4 be two-wire and around, the size of current of being passed through equate, opposite, the vectorial sum of direction equals zero, the magnetic flux that is produced is cancelled out each other, secondary winding L5 does not have induced current.When electric shock or uneven electric leakage take place in power circuit; electric current among primary coil L3, the L4 of zero-sequence transformer B2 is no longer equal; the magnetic flux that is produced can not be cancelled out each other; secondary winding L5 responds to the electric leakage signal that touches of an alternation; anti-time limit characteristic according to current protection; behind diode D2, D3 voltage multiplying rectifier; through resistance R 1, after capacitor C 5 filtering, trigger controllable silicon SCR; make the controllable silicon SCR conducting; the coil of release TQ gets electric adhesive, makes two moving contact action, thereby switch is disconnected; cut off the power supply of power consumption equipment, touched, earth leakage protective.

Touching on the basis of electric-leakage detection circuit, utilize varistor, can also carry out overvoltage protection work.As shown in Figure 1, cross-over connection varistor RU between described power input A and the described load zero line side N '.So just constitute a simulation and touch loop of electric leakage, suitably select the resistance of varistor RU, voltage just often, the resistance of piezo-resistance RU is very big, when supply voltage raise (the overvoltage operating value of discharge cock) when having exceeded set point.Piezo-resistance RU becomes low resistance by high value rapidly; be similar to the work breakdown conditions of voltage stabilizing didoe; overvoltage just flows through on piezo-resistance RU with the form of discharging current; the secondary L5 of zero-sequence transformer B2 responds to the electric leakage signal that touches of an alternation; anti-time limit characteristic according to current protection; through diode D2; behind the D3 voltage multiplying rectifier; through resistance R 1, after capacitor C 5 filtering, trigger controllable silicon SCR; make the controllable silicon SCR conducting; the coil of release TQ gets electric adhesive, makes two moving contact action, thereby switch is disconnected; cut off the power supply of power consumption equipment, carried out overvoltage protection.

As shown in Figure 1, connect hand switch S and resistance R 3 at the two ends of varistor RU.Its effect is the usefulness of the performance and the maintenance power consumption equipment of this multi-functional discharge cock of check.

This multi-functional discharge cock has the double action of fuse and disconnecting link switch, be used on the power consumption equipment of 220 volts of low pressure, when power consumption equipment is short-circuited, overload, overvoltage, touch, when leaking electricity, can cut off the power supply of power consumption equipment rapidly, in power circuit, make the usefulness of insurance and circuit conversion.This multi-functional discharge cock has directly adopted controllable silicon to make control driving component, normally uses not consumed power, and circuit is simple, has adopted voltage doubling rectifing circuit, and controllable silicon is triggered, and the sensitivity of complete machine is higher, and short circuit can be moved within 1 second.Overvoltage value is less than or equal to 250 volts.Rated operational current 5-200A, ambient temperature-30 ℃-+40 ℃, relative humidity 80%.Single-phase two utmost point short circuits overload is adjustable operate time: 1-60 second, touch, leakage current can be made into 10-30mA (according to GB GB6829-86) operate time is less than 0.1 second.This device adopts all electronic circuit, and multiple functional, adjustable extent is big, applied widely, safe and reliable.

Claims

1, a kind of multi-functional discharge cock, include housing, executive circuit, circuits for triggering, short circuit, overload detection circuit, it is characterized in that described executive circuit be adopt release TQ to work to control two respectively with power input A, the moving contact that zero-power line end N connects, one end of the coil of this release TQ meets described power input A by diode D5, the anode of the controllable silicon SCR of the described circuits for triggering of another termination, the negative electrode of this controllable silicon SCR meets the load zero line side N ' of alternating current, described short circuit, overload detection circuit is to adopt current limliting instrument transformer B1 to detect the sampling short circuit, overload signal, the elementary winding L 1 of this current limliting instrument transformer B1 be connected on described power input A and load output terminals A ' between, two termination variable resistor WR of its secondary winding L 2, the centre cap of this variable resistor WR connects by diode D1, the current rectifying and wave filtering circuit that capacitor C 1 is formed, the short circuit of this current rectifying and wave filtering circuit, the output of overload detection signals is by voltage-stabiliser tube DW, resistance R 1 in the described circuits for triggering connects the control utmost point of described controllable silicon SCR.

2, multi-functional discharge cock according to claim 1, it is characterized in that this discharge cock also comprises touches, electric-leakage detection circuit, this touches electric-leakage detection circuit is to adopt zero-sequence transformer B2 to detect sampling to touch, electric leakage signal, the elementary winding L 4 of this zero-sequence transformer B2, L3 be two-wire and around, be located at respectively power input A and load output terminals A ' between, and between zero-power line end N and the load zero line side N ', two terminations of its secondary winding L 5 are by capacitor C 2, diode D2, D3, capacitor C 3, the voltage multiplying rectifier that C4 forms, filter circuit, this voltage multiplying rectifier, touching of filter circuit, the output of electric leakage signal joins by the control utmost point of the resistance R in the described circuits for triggering 1 with described controllable silicon SCR.

3, multi-functional discharge cock according to claim 1 and 2 is characterized in that cross-over connection varistor RU between described power input A and described load zero line side N '.