CN2715388Y

CN2715388Y - Multifunctional safety socket

Info

Publication number: CN2715388Y
Application number: CN 200420009072
Authority: CN
Inventors: 贾春盛
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-28
Filing date: 2004-05-28
Publication date: 2005-08-03
Anticipated expiration: 2014-05-28

Abstract

The utility model relates to a multifunctional safety socket, comprising a working power supply, a voltage sample circuit, a datum voltage circuit and an electric leakage protection circuit. The utility model is characterized in that this multifunctional safety socket is provided with a double-limited voltage protective circuit, a silicon-controlled output circuit and an output device KA. The voltage sample circuit is composed of R3, R4 and C3, and the datum voltage is provided by R5, R6 and R7. The electric leakage control part is composed of a balancing coil ZCT, a rectifying diode D5, a testing button K and a current-limiting resistor R11. The double-limited voltage comparator IC1 is an LM358 integration block which can be connected into two voltage comparators. A1 is the upper limit voltage comparator, and A2 is the lower limit voltage comparator. The silicon-controlled output circuit is composed of an amplifier Q1, an amplifier Q2 and a double-direction silicon-controll SCR. The output device KA adopts the normally open double-contact of a relay to export the supply of power. This multifunctional safety socket has the over voltage protective function, the under voltage protective function, the electric leakage protective function, the over current protective function, the spike voltage eliminating function, the power supply breakwire protective function and the self-diagnosis function.

Description

The multifunctional protecting socket

Technical field:

The invention belongs to supply socket, be meant the supply socket of functions such as having overpressure protection function, under-voltage protection function, overcurrent protection function, earth leakage protective especially.

Background technology:

For Electrical Safety is a very most advanced and sophisticated science, any country all dare not vouch for and oneself solve the problem of power supply safety, moreover China is vast in territory, and the western and eastern's expanding economy is very unbalanced again, and various places also are uneven for the hardware and software level of electricity consumption.For example, because power supply quality and the wrong voltage jump that causes of construction, or owing to the electric equipment products poor quality, the electrical equipment that the river humid environment causes is damaged, even the personnel that the cause fire incident that injures and deaths and electrical damage cause of getting an electric shock occurs repeatedly.

Supply socket can be described as the indispensable consuming device of living present people's day, and its quality quality not only is related to oneself Electrical Safety, and the safety of related neighbours and society.

Existing supply socket defencive function is single, and overcurrent protection function is generally only arranged, and adds creepage protection function at most.This supply socket is made up of working power, voltage sample circuit, reference voltage, leakage protection circuit and relay output device, wherein, working power adopts capacitance decompression, diode rectification commonly used to provide, it is by capacitance decompression, diode halfwave rectifier, and voltage-stabiliser tube and electric capacity carry out voltage stabilizing and filtering; Voltage sample circuit is realized by electric resistance partial pressure; Reference voltage is connected in series with voltage-stabiliser tube by resistance, and voltage-stabiliser tube provides; Leakage protection circuit is made up of overcurrent balance coil, rectifier diode and current-limiting resistance, and output device is to use relay.

There is youngster's specified index in producer when the design electric equipment products, such as rated voltage, rated power, the class of insulation etc.But this is not that electrical equipment will damage at once during voltage one overrate, because the rating number of electrical equipment has a positive and negative scope, general value is ± 10%, and have anti-time limit characteristic, when promptly overrate was high more, electrical equipment allowed the time of energising just short more.

For example, the compressor of the refrigerator of 220V, a 120W, its impedance is about 400 Ω, rated current 0.54A.When input voltage during in the 250V left and right sides, electric current is 0.625A, though at this moment some overcurrent of compressor and heating in winding, can because of overcurrent and overtemperature protection also do not reach operating value, so compressor can also work on.But, voltage can be higher or when reaching near 380V under certain reason, at this moment compressor can make insulation heating rapidly because of electric current is excessive, the result be since the damage of insulation cause the bigger electric current → temperature of impedance reductions → formation higher → impedance is lower → vicious circle of the bigger electric current of formation, finally must be that compressor has burnt.When neutral point excursion or line impedance bigger, cause the supply voltage of supply line to cross when hanging down, particularly ought reach the critical of compressor operating voltage prescribes a time limit down, cause the damage of electrical equipment and make the supply voltage of electrical network lower easilier, can cause when serious that circuit burns, initiation fire accident and threaten the safe operation of electrical network.It is not enough being provided with overcurrent protection function separately.

Summary of the invention:

The utility model provides a kind of multifunctional protecting socket, and it has functions such as overpressure protection function, under-voltage protection function, creepage protection function, overcurrent protection function, power supply breaking protection function and elimination peak voltage.It is except that comprising working power, voltage sample circuit, reference voltage, leakage protection circuit and output device, also increase dual-electricity-limiting voltage protection circuit and controlled output circuit, wherein, the dual-electricity-limiting voltage protection circuit adopts dual-threshold voltage comparator, it is an ic chip 1, two groups of voltage comparators are arranged, upper voltage limit comparator A1 and lower voltage limit comparator A2; Controlled output circuit is made up of amplifier Q1, Q2 and bidirectional triode thyristor SCR; Working power adopts capacitance decompression, diode rectification commonly used to provide; Output device is selected relay normally open binode output power supply for use.

Description of drawings:

Fig. 1 is the utility model circuit theory diagrams.

Fig. 2 is that the utility model is formed schematic diagram.

Embodiment:

See Fig. 1, Fig. 2, the utility model is a kind of multifunctional protecting socket, comprises working power 1, voltage sample circuit 2, reference voltage 3, leakage protection circuit 5 and output device 7, and voltage sample circuit 2 is made up of R3, R4, C3; Reference voltage 3 is provided by R5, R6, R7; Leakage protection circuit 5 is made up of overcurrent balance coil ZCT, rectifier diode D5, test button K and current-limiting resistance R11, it is characterized in that: be provided with dual-electricity-limiting voltage protection circuit 4 and controlled output circuit 6, dual-electricity-limiting voltage protection circuit 4 adopts dual-threshold voltage comparator, it is an ic chip 1, it is an ic chip 1, two groups of voltage comparators are arranged, upper voltage limit comparator A1, lower voltage limit comparator A2; Controlled output circuit 6 is made up of amplifier Q1, Q2 and bidirectional triode thyristor SCR; Output device 7 selects for use relay K A often to open binode output power supply.Bound

See Fig. 1, concrete annexation is as follows:

Civil power 220V is through hot overcurrent insurance FU and push-button switch SA, piezo-resistance R1, relay K A contact KA-1, KA-2 links to each other, the push-button switch SA other end joins with relay K A and capacitor C 1, capacitor C 1 other end and resistance R 2, R3 links to each other, resistance R 3 other ends and capacitor C 3, resistance R 4 and upper voltage limit comparator A1 input tripod, lower voltage limit comparator A2 input the 6th pin links to each other, resistance R 2 other ends and capacitor C 2, voltage-stabiliser tube D2, resistance R 5, resistance R 9 links to each other with upper voltage limit comparator A1 octal and transistor Q2 collector electrode, resistance R 5 other ends link to each other with resistance R 6 and upper voltage limit comparator A1 input crus secunda, resistance R 6 other ends link to each other with resistance R 7 and lower voltage limit comparator A2 input the 5th pin, upper voltage limit comparator A1 exports into end first pin and connects diode D3 positive pole, lower voltage limit comparator A2 output the 7th pin connects diode D4 positive pole, diode D3 negative pole and diode D4 negative pole, diode D5 negative pole and resistance R 8 connect, resistance R 8 another termination transistor Q1 base stages, resistance R 9 other ends connect transistor Q2 base stage and transistor Q1 collector electrode, transistor Q2 emitter connecting resistance R10, resistance R 10 another termination bidirectional triode thyristor SCR control end and capacitor C 4, the relay K A other end is connected with bidirectional triode thyristor SCR, the bidirectional triode thyristor SCR other end and capacitor C 4, transistor Q1 emitter, voltage comparator A2 the 4th pin, resistance R 7, overcurrent balance coil ZCT secondary coil, resistance R 4, capacitor C 3, voltage-stabiliser tube D2, capacitor C 2, piezo-resistance R1 and relay K A contact KA-3 connect, one of relay K A contact KA-3 contact connecting resistance R11 and supply socket CZ jack, resistance R 11 other ends are taken over mobile equilibrium coil ZCT primary coil, primary coil links to each other with relay K A contact KA-2 and another jack of supply socket CZ through test button K, and the diode D5 other end is taken over mobile equilibrium coil ZCT secondary coil.Wherein, push-button switch SA is when producing, and is used to adjust circuit setting.When the multifunctional protecting socket was used for big electric current, output device 7 can be selected A.C. contactor for use.

Overpressure protection, under-voltage protection operation principle are as follows:

The setting of voltage comparator working point, it is 2.5V that A point current potential is set when external voltage 250V, and it is 1.8V that A point current potential is set when 180V, and setting D point current potential is 2.5V, and C point current potential is 1.8V.

When input voltage＞250V; A point 〉=2.5V sets current potential greater than the D point, and this moment, dual-threshold voltage comparator IC1-1 pin had 3V output, D point high level; transistor Q1 conducting; E point current potential descends, and transistor Q2 ends, and transistor F point current potential also descends; cause controllable silicon SCR that alternating current is turn-offed; relay K A coil losing electricity disconnects socket power, plays the effect of protection electrical equipment.

In like manner, when input voltage≤180V, A point≤1.8V sets current potential less than the C point; this moment, dual-threshold voltage comparator IC1-7 pin had 3V output; D point high level, transistor Q1 conducting, E point current potential descends; transistor Q2 ends; transistor F point current potential also descends, and causes controllable silicon SCR that alternating current is turn-offed, relay K A coil losing electricity; disconnect socket power, play the effect of protection electrical equipment.

Earth leakage protective operation principle: just often at load; the electric current that flows through balance coil ZCT is an opposite sign but equal magnitude; so balance coil no-output; when load when the bypass leakage electric current is arranged; the electric current that flows through balance coil ZCT is balance no longer just; the magnetic strength electromotive force of balance coil ZCT output through D5 is whole connect stream after, make the rising of D point current potential, D point high level; transistor Q1 conducting; E point current potential descends, and transistor Q2 ends, and F point current potential descends; cause controllable silicon SCR that alternating current is turn-offed; relay K A coil losing electricity disconnects socket power, plays the effect of protection electrical equipment.

The utility model has the advantages that:

1, has the overpressure protection function.When the circuit input voltage surpassed set point 250V, (can according to actual adjustment) can break and cut off the electricity supply, and plays the effect of protection electrical equipment.

2, has under-voltage protection function.When the circuit input voltage is lower than set point during 170V, (can according to actual adjustment)), but deenergization plays the effect of protection electrical equipment.

3, has creepage protection function.When the electric leakage heart 〉=15MA takes place in power consumption equipment, in 0.1 second, can deenergization, play the effect of protection electrical equipment.

4, has overcurrent protection function.When power consumption equipment electric current during greater than set point, can deenergization, play the effect of protection.

5, the function that has breaking protection.When the incoming line phase shortage, can break and cut off the electricity supply, play the effect of protection electrical equipment.

The utility model novel structure, simple in circuits, with low cost.

Claims

1, a kind of multifunctional protecting socket, comprise working power (1), voltage sample circuit (2), reference voltage (3), leakage protection circuit (5) and output device (7), it is characterized in that: be provided with dual-electricity-limiting voltage protection circuit (4) and controlled output circuit (6), dual-electricity-limiting voltage protection circuit (4) adopts dual-threshold voltage comparator, it is an integrated package (IC1), two groups of voltage comparators are arranged, upper voltage limit comparator (A1), lower voltage limit comparator (A2); Controlled output circuit (6) is made up of amplifier (Q1, Q2) and bidirectional triode thyristor (SCR); The annexation of circuit elements device is as follows: civil power 220V insures (FU) and push-button switch (SA) through hot overcurrent, piezo-resistance R1, relay (KA) contact KA-1, KA-2 links to each other, push-button switch (SA) other end joins with relay (KA) and capacitor C 1, capacitor C 1 other end and resistance R 2, R3 links to each other, resistance R 3 other ends and capacitor C 3, resistance R 4 and upper voltage limit comparator (A1) input tripod, lower voltage limit comparator (A2) input the 6th pin links to each other, resistance R 2 other ends and capacitor C 2, voltage-stabiliser tube D2, resistance R 5, resistance R 9 links to each other with upper voltage limit comparator (A1) octal and transistor Q2 collector electrode, resistance R 5 other ends link to each other with resistance R 6 and upper voltage limit comparator (A1) input crus secunda, resistance R 6 other ends link to each other with resistance R 7 and lower voltage limit comparator (A2) input the 5th pin, upper voltage limit comparator (A1) output is gone into end first pin and is connect diode D3 positive pole, lower voltage limit comparator (A2) output the 7th pin connects diode D4 positive pole, diode D3 negative pole and diode D4 negative pole, diode D5 negative pole and resistance R 8 connect, resistance R 8 another termination transistor Q1 base stages, resistance R 9 other ends connect transistor Q2 base stage and transistor Q1 collector electrode, transistor Q2 emitter connecting resistance R10, resistance R 10 another termination bidirectional triode thyristor (SCR) control end and capacitor C 4, relay (KA) other end is connected with bidirectional triode thyristor (SCR), bidirectional triode thyristor (SCR) other end and capacitor C 4, transistor Q1 emitter, lower voltage limit comparator (A2) the 4th pin, resistance R 7, overcurrent balance coil (ZCT) secondary coil, resistance R 4, capacitor C 3, voltage-stabiliser tube D2, capacitor C 2, piezo-resistance R1 and relay (KA) contact KA-3 connects, one of relay (KA) contact KA-3 contact connecting resistance R11 and supply socket (CZ) jack, resistance R 11 other ends are taken over mobile equilibrium coil (ZCT) primary coil, primary coil links to each other with relay (KA) contact KA-2 and another jack of supply socket (CZ) through test button (K), and the diode D5 other end is taken over mobile equilibrium coil (ZCT) secondary coil.

2, by the described multifunctional protecting socket of claim 1, it is characterized in that: overcurrent balance coil (ZCT) adopts magnet ring, elementary 2～5 circles, secondary 400～600 circles.

3, by the described multifunctional protecting socket of claim 1, it is characterized in that: output device 7 is selected A.C. contactor for use.