CN87210254U

CN87210254U - Protector for electricity supply interruption

Info

Publication number: CN87210254U
Application number: CN 87210254
Authority: CN
Inventors: 沈以清; 宋淑琴; 刘秉义
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-07-22
Filing date: 1987-07-22
Publication date: 1988-07-13

Abstract

The utility model relates to a protector for electricity supply interruption which is an electric appliance automatic protection device. Compared with the general protector for electricity supply interruption, the protector for electricity supply interruption is composed of a transformer, a rectifier, a drive circuit, a buzzer alarm circuit, a power display circuit and a load display circuit. The buzzer alarm circuit of the protector for electricity supply interruption adopts an ordinary transistor. The protector for electricity supply interruption can automatically alarm and stop alarming after a time, and the alarming time is adjustable, so the protector for electricity supply interruption can be widely used for the industry or domestic appliances.

Description

Protector for electricity supply interruption

The outage protector is a kind of electrical equipment automatic safety device.

Usually, the outage protective device is formed (see figure 1) by electromagnetic relay and push-button switch, and the 1st, power supply, the 2nd, power consumption equipment, J ' they are the coils of relay or contactor, J ₁' and J ₂' be two normally opened contacts of J ', A ₁Be normally closed button, A ₂Be often to drive button.During operate as normal, J ' energising, J ₁' and J ₂' closure.When outage, J ' outage, J ₁' open power consumption equipment outage, J ₂' also open, after the power system restoration power supply, only press start button A ₂Power consumption equipment is switched on again and enter normal operating conditions, A ₁Then in the time will shutting down, just work.It generally is used for lathe, and its shortcoming is: can not report to the police automatically during incoming call.

The purpose of this utility model is to propose a kind of outage protector that can stop sound when power system restoration is powered automatically by certain frequency warning and time-delay automatically, it is characterized in that it is by step-down transformer Tr and bridge rectifier D ₁With filter capacitor C ₂The DC power supply of forming; Drive circuit; Buzzer alarm circuit and power supply show, the load display circuit is formed, and physical circuit is seen Fig. 2.Wherein, drive circuit is mainly by the coil J and the reverse isolation diode D of relay or contactor ₂After the parallel connection again with triode T ₁Be in series T ₁Base stage then pass through resistance R ₂, by the normally opened contact J of J ₃Be connected on the DC power supply with the small-sized parallel circuits of often opening button An composition.At normally opened contact J ₃Left and right two ends, respectively by current-limiting resistance R ₃, R ₄With light-emitting diode L ₁, L ₂Ground connection, thus power supply demonstration, load display circuit formed.Warning circuit then passes through the normally-closed contact J of J ₂Link to each other with DC power supply, the power consumption equipment 2 that protect then with another normally opened contact J of J ₁Get access to grid after the series connection.

General buzzer alarm circuit is by R ' ₁, C ' ₁Charging circuit, unijunction transistor UJT and buzzer F form, and physical circuit is seen Fig. 3.As C ' ₁On voltage when being charged to the turning-on voltage of UJT by direct voltage U, UJT is open-minded, C ' ₁By buzzer F ' discharge.C ' ₁During discharge, voltage reduces, and when dropping to the shutoff voltage of UJT, UJT turn-offs, F ' outage, C ' ₁Begin charging again.So go round and begin again, the electric current among the F ' is neglected logical neglecting and is broken, and rings endlessly, just can stop after must cutting off the electricity supply to ring.In order to overcome this shortcoming, the utility model proposes a kind of buzzer siren that can stop sound automatically, it is characterized in that: adopted triode T ₂Its base stage meets R ₁C ₁Delay circuit has connect a buzzer between collector electrode and the ground.D ₁The direct voltage of output is through resistance R ₃Connect buzzer F, in its warning, power supply is through R ₁To C ₁C is worked as in charging ₁On voltage when being charged to 0.7 volt of left and right sides, T ₂Saturation conduction, F are stopped by short circuit to ring.Thereby the time of fire alarming of F is by C ₁On voltage be charged to 0.7 volt of time decision when required, have time-delay and stop the effect of ringing automatically, but also economized a unijunction transistor.

J when the electrical network normal power supply ₁Closure, power consumption equipment 2 energisings; J ₃Closure, coil J energising; J ₂Open, warning circuit is not worked.

When electrical breakdown, coil J dead electricity, J ₃Open J ₁Open power consumption equipment outage, J ₂Closure, warning circuit is in standby condition.

D when power system restoration is powered ₁Output dc voltage is reported to the police F, simultaneously, and C ₁Charging, F stops to report to the police when being charged to 0.7 volt.When the user hears the police and the equipment of use, can press An, connect T ₁Base loop make coil J energising, recover normal operating conditions.

Power display circuit is by current-limiting resistance R ₄, red light emitting diodes L ₂Be in series, can represent its normal operating conditions with green, red two looks respectively.

This shows, compare that it is capable of automatic alarm and can stop automatically to ring with general outage protective device, and and time of fire alarming is adjustable, as long as levelling charging resistor resistance.

If at contactor coil of power consumption equipment end 2 places adjunction, just the available latter's normally open contact goes to control the break-make of big electric current in the major loop.

Claims

1, the outage protector is a kind of electrical equipment automatic safety device; generally form by electromagnetic relay and push-button switch; of the present utility model being characterised in that; it is by low-voltage dc power supply, drive circuit; buzzer alarm circuit and power supply show, the load display circuit is formed, and wherein drive circuit is mainly by relay coil J and reverse isolation diode D ₂After the parallel connection again with triode T ₁Be in series T ₁Base stage then pass through resistance R ₂, by the normally opened contact J of J ₃Be connected on the DC power supply with the small-sized parallel circuits of often opening button An composition, at normally opened contact J ₃About two ends, respectively by current-limiting resistance R ₃, R ₄With light-emitting diode L ₁, L ₂Ground connection, thus power supply demonstration, load display circuit formed, and buzzer alarm circuit then meets R by grounded emitter, base stage ₁C ₁The triode T of delay circuit ₂With a termination T ₂Collector electrode, the buzzer of other end ground connection is formed, this warning circuit is the normally-closed contact J by J also ₂And D ₁Output link to each other, the power consumption equipment 2 that protect then with another normally opened contact J ₁Get access to grid after the series connection.