CN1055073A

CN1055073A - The auto-transformer type AC stabilizer

Info

Publication number: CN1055073A
Application number: CN 90102822
Authority: CN
Inventors: 陈忆申; 周萍
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-03-23
Filing date: 1990-03-23
Publication date: 1991-10-02

Abstract

The present invention provides a kind of with changing the elementary tap of autotransformer, makes a kind of relay of vary stable within claimed range---the auto-transformer type AC stabilizer of secondary output voltage.When the electrical network input voltage changed in allowed band, the primary and secondary electrical network that all breaks away from of autotransformer played purpose of saving, and overvoltage is arranged, under-voltage protection function.Circuit is simple, device few, it is constant that output power can reach, the efficient height.

Description

The auto-transformer type AC stabilizer

The present invention is specifically related to a kind of auto-transformer type AC stabilizer, exactly, is a kind of relay-auto-transformer type AC stabilizer.

Be indicated in the relay-auto-transformer type AC stabilizer on the market at present, when the input AC electrical network changes, adopt the secondary tap way of change autotransformer to realize regulated output voltage, reduce the purpose of amplitude of variation.This way can not reach constant output, and along with secondary tap descends, output power also descends; Simultaneously, autotransformer can not be thrown off with electrical network, and consumed power can not be realized purpose of saving all the time.

The concrete task of the present invention is to provide a kind of with changing the elementary tap of autotransformer, and the vary stable that makes secondary output voltage is within claimed range; When the variation of electrical network input voltage during in allowed band, the primary and secondary electrical network that all breaks away from of autotransformer reaches purpose of saving; When line voltage is too high or too low, can allow load break away from a kind of auto-transformer type AC stabilizer of electrical network again.

Accompanying drawing 1 is a circuit structure diagram of the present invention.

The concrete task of the present invention is finished as follows: when the variation of electrical network input voltage when " allowed band ", control loop output makes relay J 3-1, J3-2 joins with its normally-closed contact 1 respectively, all the other situations are all joined with normally opened contact 2; When the electrical network input voltage is lower than allowed band, be in " low I " when interval, control loop output makes relay J 1, and J2 all joins with normally-closed contact 1; When the electrical network input voltage is lower than " low I " interval, be in " low II " when interval, control loop output is joined relay J 1 and normally opened contact 2, and J2 still joins with normally-closed contact; Be higher than " allowed band " at the electrical network input voltage, when being in " high I " interval, control loop output is joined relay J 2 and normally opened contact 2; When electrical network input voltage " too high " or " excessively low ", perhaps output voltage " too high " or " excessively low " when bringing danger to load after the voltage stabilizing, thus control loop output makes relay J 4 and the normally-closed contact 1 disconnecting consumers loop that joins, and load is protected.

(1) autotransformer loop, the elementary tap of autotransformer T1 are 1., 2. join with the normally opened contact 2 and the normally closed contact 1 of relay J 1 respectively; 4. tap joins with relay J 2 normally opened contacts 2; 3. the secondary tap of autotransformer T1 joins with relay J 3-2 contact; Relay J 3-1 normally closed contact 1 is connected with relay J 3-2 normally opened contact 2 and relay J 4 contacts; Relay J 2 normally closed contacts 1 and relay J 1 contact join; Relay J 3-1 contact and autotransformer

Be connected across between the end on the electrical network input end AB; Relay J 4 normally opened contact 2 and autotransformers

Be connected with voltage stabilizing output CD end between the end form;

(2) sampling, comparison loop, by the transformer T2 that is connected across electrical network input AB end, commutation diode D13 resistance R 36～39, capacitor C 1～4, the input sample voltage Vsin that stabilivolt DZ1, DZ2 and triode Q5 form, reference voltage V ref, and the input sample formed of the boosting voltage V+ accessory power supply of holding concurrently; By the transformer T3 that is connected across between relay J 4 contacts and the ground, and commutation diode D9～12, resistance R 40, R41, the output sampled voltage Vsou that capacitor C 5, C6 form _DPass through resistance R 24～35 by reference voltage, potentiometer W1～7 dividing potential drops obtains reference voltage separately respectively by W1～W7 sliding tap place, and is added to amplifier IC1～IC3 separately, corresponding in-phase end of IC5～IC8 or end of oppisite phase, and combine with resistance R 1～R23 diode D1～D8 and form;

(3) control loop is connected across triode Q1～Q4 collector and accessory power supply V respectively by relay J 1, J2, J3, J4 line bag ₊Between, triode Q1～Q4 base stage directly or by after resistance and the diode-isolated respectively with amplifier IC1～IC4 output terminal join form;

Circuit of the present invention is simple, and used components and parts are few, satisfies output voltage and changes requirement in " allowed band ", reaches constant output, and energy-conservation, overvoltage, under-voltage protection function are arranged.

Below will contrast accompanying drawing, in conjunction with the embodiments the present invention will be further described.

With reference to accompanying drawing 1,1) be in " low I " zone (as be lower than 200V be higher than between the 178V) when the electrical network input voltage is lower than " allowed band ", input sample voltage makes amplifier IC3 be output as height, and level IC1 is output as low level, cause triode Q3 conducting, Q1 ends; Relay J 3, adhesive, J3-1, J3-2 all join with normally opened contact 2; Relay J 1 contact discharges, and joins with normally closed contact 1, jumps in the autotransformer tap; 2) when being lower than " low I ", electrical network input is in " low II " zone (as be lower than 178V be higher than between the 150V), input sample voltage makes amplifier IC3 and holds original state, and amplifier IC1 is output as high level, triode Q1 conducting, relay J 1 adhesive is joined with normally opened contact 2; 3) be higher than " allowed band " and be in " high I " zone (as be higher than 235V be lower than between the 265V) when the electrical network input voltage, input sample voltage makes amplifier IC2 be output as high level, causes triode Q2, the equal conducting of Q3, relay J 2, the equal adhesive of J3, J3-1, J3-2 all join with normally opened contact 2; 4) (as be higher than 200V when " allowed band " when the electrical network input voltage, be lower than between the 235V), input sample voltage makes amplifier IC3, IC2 output is low level, triode Q3 ends, and relay J 3 discharges J3-1, J3-2 and normally closed contact 1 join, and the electrical network input voltage joins by relay J 3-1 contact 1 and voltage stabilizing output C end; 5) make amplifier IC5 or amplifier IC6 be output as high level respectively when electrical network input voltage too high (as being higher than 265V) or input voltage low excessively (as being lower than 150V) input sample voltage, force amplifier IC4 to be output as low level, triode Q4 ends, and relay J 4 discharges, and joins with normally closed contact 1; 6) when output voltage " too high " (as being higher than 245V) or " low excessively " (as being lower than 200V), output sampled voltage VsouT makes amplifier IC7 or IC8 be output as high level, forces amplifier IC4 to be output as low level, guarantees that relay J 4 discharges, join with normally closed contact 1, output is thrown off with load.

The present invention can improve precision with the shake depressor tap and increase relay quantity way of increase self coupling, reduces the amplitude that output voltage changes; Working point with regulating the adjustable potentiometer W in the sampling comparison loop changes the change in voltage zone.

Claims

1, a kind of AC stabilizer of auto-transformer type, by sample circuit, voltage comparator circuit, control circuit, relay group and auto-transformer post are formed, and it is characterized in that:

When the electrical network input voltage changes when " allowed band ", control loop output is joined relay J 3-1, J3-2 respectively with its normally closed contact 1;

When the electrical network input voltage is lower than allowed band, be in " low worker " when interval, control loop output is all joined relay J 1, J2 with normally closed contact 1;

When the electrical network input voltage is lower than " low worker " interval, be in " low Π " when interval, control loop output is joined relay J 2 and normally closed contact, and J1 and normally opened contact 2 join;

When the electrical network input voltage is higher than " allowed band ", be in " high I " when interval, control loop output is joined relay J 2 and normally opened contact 2;

When the electrical network input voltage is lower than " low Π ", be in low area; Perhaps be higher than " high I ", be in too high when zone, control loop output is joined relay J 4-5 normally closed contact 1;

When voltage stabilizing output voltage " too high " or " low excessively ", control loop output is joined relay J 4 and normally closed contact;

(a) autotransformer loop, the elementary tap of autotransformer T1 are 1., 2. join with the normally opened contact 2 and the normally closed contact 1 of relay J 1 respectively; 4. tap joins with relay J 2 normally opened contacts 2; 3. the secondary tap of autotransformer T1 joins with relay J 3-2 contact; Relay J 3-1 normally closed contact 1 is connected with relay J 3-2 normally opened contact 2 and relay J 4 contacts; Relay J 2 normally closed contacts 1 and relay J 1 contact join; Relay J 3-1 contact and autotransformer

Be connected across between the end on the electrical network input end AB; Relay J 4 normally opened contact 2 and autotransformers Be connected with voltage stabilizing output CD end between the end form;

(b) sampling, comparison loop, by the transformer T2 that is connected across electrical network input AB end, commutation diode D13 resistance R 36～39, capacitor C 1～4, the input sample voltage Vsin that stabilivolt DZ1, DZ2 and triode Q5 form, the input sample that reference voltage V ref1 and accessory power supply V+ the form accessory power supply of holding concurrently; By the transformer T3 that is connected across between relay J 4 contacts and the ground, and commutation diode D9～12, resistance R 40, R41, capacitor C 5, the output sampled voltage VsouT that C6 forms; By resistance R 24～35, potentiometer W1～7 dividing potential drops is obtained separately reference voltage respectively and is added to amplifier IC1～IC3 separately by W1～7 sliding tap places by reference voltage,

Corresponding in-phase end of IC5～IC8 or end of oppisite phase, and combine with resistance R 1～23 diode D1～8 and form;

(c) control loop, be connected across respectively between triode Q1～4 collectors and the accessory power supply V+ by relay J 1, J2, J3, J4 line bag, triode Q1～4 base stages directly or by after resistance and the diode-isolated respectively with amplifier IC1～4 output terminals join form;

2, auto-transformer type AC stabilizer according to claim 1 is characterized in that described change in voltage in " allowed band " is～200V-～235V;

3, auto-transformer type AC stabilizer according to claim 1, it is characterized in that described line voltage be in " low I " interval for～178V-be lower than～200;

4, auto-transformer type AC stabilizer according to claim 1 is characterized in that, described line voltage is in " low II " interval and is～150V-～178V;

5, auto-transformer type AC stabilizer according to claim 1 is characterized in that, described line voltage is in " high I " interval and is～235V-～265V;

6, auto-transformer type AC stabilizer according to claim 1, when it is characterized in that described line voltage " too high " or " low excessively ", control loop joins relay J 4 and normally closed contact 1.