CN2497460Y

CN2497460Y - Self-protective fully-automatic over-under voltage protector

Info

Publication number: CN2497460Y
Application number: CN 01245603
Authority: CN
Inventors: 郑碎挺; 苏玉清
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-24
Filing date: 2001-05-24
Publication date: 2002-06-26
Anticipated expiration: 2011-05-24

Abstract

The utility model belongs to a self-protection type full-automatic over voltage and under voltage protector which comprises a sampling circuit, an over and under voltage control circuit, a time delay circuit, a driving circuit and a relay. The utility model has the functions of voltage automatic control and time delay control and so on. The utility model can be used for the voltage protection of the household appliances.

Description

The full-automatic under voltage protection device of crossing of self protection type

The utility model belongs to a kind of voltage control apparatus.

At present; day by day popularize at household electrical appliance such as China's air-conditioning, refrigerator, electric fan, washing machines; but not enough and electricity consumption time inequality because of supply of electric power; voltage ripple of power network is bigger; therefore household electrical appliance often are damaged; though existing have some tame non-electricity protectors to go on the market all poor because of function, shortcomings such as volume is big, reliability is low, sensitivity is low, manufacturing cost height.Fail to open in marketing.

The purpose of this utility model is for overcoming above-mentioned shortcoming, and a kind of volume that provides is little, reliability is high, highly sensitive, cost is lower, the full-automatic under voltage protection device of crossing of self protection type easy for installation, high breaking.

For achieving the above object; technical scheme provided by the utility model is the full-automatic under voltage protection device of crossing of a kind of self protection type; it comprises sample circuit; the overvoltage/undervoltage control circuit; delay circuit; drive circuit; relay; sample circuit directly is connected with electrical network; comprise resistance R 7; diode D1; electric capacity E4; the overvoltage/undervoltage control circuit comprises resistance R 8; R9; RW; R10; R11; voltage comparator ic 1-1; IC1-2; IC1-3; diode D2; D3; sample circuit with the voltage signal of electrical network input through resistance R 7 step-downs; the D1 rectification; E4 filtering; after resistance R 8; R9; R10; R11; adjustable resistance RW series-parallel connection dividing potential drop; RW is that under-voltage control point is connected with the IC1-1 in-phase input end with node between the R10; R10; node between the R11 is that the overvoltage control point is connected with the IC1-2 inverting input; IC1-1; the IC1-2 output respectively is connected in series a diode D2; D3; D2; the positive pole of D3 also is connected with the in-phase input end of voltage comparator ic 1-3; D2; a delay circuit of being made up of electrochemical capacitor E5 is gone back and connect to the D3 positive pole; the output of IC1-3 also is connected with the input of the drive circuit of being made up of triode Q3, is serially connected with a relay on the collector electrode of Q3.

Compare with existing similar products, this product has when powering on and can delay time to electrical equipment time-delay power supply; At overtension or cross when low can the quick automatic cut-off power supply; Treat to delay time 150S to electric power supply after voltage returns to normal value; Household electrical appliance are effectively protected and can not burn out.And but the withstand voltage height bringing onto load of this product power is big, anti-creepage, control precision is high, element is few, relative cost is low, ratio of performance to price advantages of higher.

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

Accompanying drawing is the full-automatic circuit theory diagrams of crossing the under voltage protection device of the utility model self protection type.

The full-automatic under voltage protection device excessively of self protection type shown in the drawings is by sample circuit 1; overvoltage/undervoltage control circuit 2; delay circuit 3; drive circuit 4; compositions such as relay J; line voltage is through capacitor C 1 step-down; the DB1 bridge rectifier; electric capacity E1 filtering; voltage-stabiliser tube Dw1 resistance R 2; R3; triode Q1 parallel voltage-stabilizing; supply with the relay J power supply; again through resistance R 4; voltage-stabiliser tube DW2; the triode Q2 voltage stabilizing of connecting; supply with ic chip 1-3 power supply; again through resistance R 5 step-downs; voltage-stabiliser tube DW3 voltage stabilizing; capacitor C 2; E3 filtering is as sampling voltage and its reference voltage relatively.Sample circuit is through resistance R 7 step-downs, diode D1 halfwave rectifier, electric capacity E4, C3 filtering, resistance R 8, R9, R10, R11, potentiometer RW dividing potential drop and its reference voltage relatively amplify through comparator IC1-1, IC1-2, the conducting of control diode D2, D3 with end, thereby control comparator IC1-3 in-phase end current potential is higher or lower than the inverting input reference voltage, makes comparator IC1-3 output high potential or electronegative potential, to drive output circuit work.

Voltage comparator ic 1-3 output also meets a light-emitting diode DD1, on the triode Q3 collector electrode and meet a light-emitting diode DD2.The utility model also includes resistance R 1, R12, R13, R14, R15, R17.

Voltage comparator ic 1-1 output high potential IC1-2 output electronegative potential when line voltage is higher than 270V ± 3V, diode D3 conducting, comparator IC1-3 in-phase end current potential is lower than the end of oppisite phase current potential, comparator IC1-3 exports electronegative potential, not conducting of triode Q3 current collection very high potential flows to the bright relay J release of DD2 red light, disconnecting consumers power supply through resistance R 19.When line voltage returned to 145V ± 3V, comparator IC1-1 output was constant, and IC1-2 output transfers high potential to, and diode D2, D3 not conducting comparator IC1-3 in-phase end current potential raise to the charging of electric capacity E5 with resistance R 6, R16.When being charged to (being the delay recovery time) about 150 seconds, IC1-3 in-phase end positive potential is higher than end of oppisite phase IC1-3 output HIGH current, makes light-emitting diode DD1 bright through resistance R 18, triode Q3 conducting, and the relay J adhesive recovers electric.Comparator IC1-1 output electronegative potential IC1-2 output is constant when line voltage is lower than 170V ± 3V, and diode D2 conducting IC1-3 in-phase end current potential descends, after in like manner, the disconnecting consumers power supply.Comparator IC1-1 output transfers high potential to when line voltage returns to 190 ± 3V, and diode D2, D3 end, and in like manner, IC1-3 in-phase end current potential raises to the charging of E5 with R6, R16.Delayed time 150 seconds, and recovered electric.Thereby effectively protect power consumption equipment.

Claims

1; the full-automatic under voltage protection device of crossing of a kind of self protection type; it is characterized in that it comprises sample circuit (1); overvoltage/undervoltage control circuit (2); delay circuit (3); drive circuit (4); relay (J); sample circuit (1) directly is connected with electrical network; comprise resistance R 7; diode D1; electric capacity E4; overvoltage/undervoltage control circuit (2) comprises resistance R 8; R9; RW; R10; R11; voltage comparator ic 1-1; IC1-2; IC1-3; diode D2; D3; sample circuit (1) with the voltage signal of electrical network input through resistance R 7 step-downs; the D1 rectification; E4 filtering; after resistance R 8; R9; R10; R11; adjustable resistance RW series-parallel connection dividing potential drop; RW is that under-voltage control point is connected with the IC1-1 in-phase input end with node between the R10; R10; node between the R11 is that the overvoltage control point is connected with the IC1-2 inverting input; IC1-1; the ICI-2 output respectively is connected in series a diode D2; D3; D2; the positive pole of D3 also is connected with the in-phase input end of voltage comparator ic 1-3; D2; a delay circuit of being made up of electrochemical capacitor E5 (3) is gone back and connect to the D3 positive pole; the output of IC1-3 also is connected with the input of the drive circuit of being made up of triode Q3 (4), is serially connected with a relay (J) on the collector electrode of Q3.

2, the full-automatic under voltage protection device of crossing of self protection type according to claim 1, its row are levied and are described voltage comparator ic 1-3 output also and connect a light-emitting diode DD1, on the triode Q3 collector electrode and connect a light-emitting diode DD2.