CN2348514Y

CN2348514Y - Mains switch for domestic electrical equipment

Info

Publication number: CN2348514Y
Application number: CN 98244547
Authority: CN
Inventors: 王光辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-01
Filing date: 1998-10-01
Publication date: 1999-11-10
Anticipated expiration: 2008-10-01

Abstract

The utility model relates to a mains switch for domestic electrical equipment. The mains switch of the existing domestic electrical equipment has the problems that low-voltage protection is not provided, the electric-impact protection is not provided, and a plurality of press keys are difficult to control at the same time; thus, in order to solve the problems of the mains switch of the existing domestic electrical equipment, the utility model adopts relays to form a feedback self-locking control circuit; thereby, by using simple and economical schemes, the utility model can have the advantages that the automatic protection of the power failure is realized, the automatic protection of the low pressure is realized, the protection of the electric-impact prevention is realized while the definite interval time is formed between the opening action and the closing action, and the function can be controlled by plurality of press keys at the same time.

Description

The mains switch of household electrical appliance

The utility model relates to the mains switch of household electrical appliance.

In the background technology, the mains switch great majority of control household electrical appliance adopt pure mechanical structure on the market, and small part has acoustic control, light-operated or delay circuit.The technical staff generally believes that above manual control, acoustic control, function light-operated or time-delay are enough to reach the specification requirement of the mains switch of household electrical appliance, have that powers failure, low pressure are protected automatically, between the Push And Release at interval the mains switch controlled simultaneously of certain hour, a plurality of button have higher cost and the consumer to be difficult to acceptance.But the mains switch on the market has following shortcoming: can not cut off the electricity supply automatically when voltage is low; No certain hour interval between the Push And Release, HF switch makes surge more serious to the harm of household electrical appliances; A plurality of buttons are controlled simultaneously needs many lines, complex circuit.

The purpose of this utility model be the circuit with simple economy provide have power failure, low pressure is protected automatically, switch gap certain hour, a plurality of button mains switch of the household electrical appliance of controlled function simultaneously.

The utility model adopts following technical scheme.Comprise the switch box body, switch key, fire ground access point and circuit part, it is characterized in that circuit part comprises direct current charge-discharge circuit 1 and the DC power supply circuit 3 to executive circuit 4 power supplies, between direct current charge-discharge circuit 1 and executive circuit 4, be provided with control operation circuit 2, executive circuit 4 control civil power make contact J1 or J2, J1 connects direct current charge-discharge circuit 1, J2 connects DC power supply circuit 3 and load RL, connecting resistance R 2 and capacitor C 2 between the both positive and negative polarity of direct current charge-discharge circuit 1, executive circuit 4 comprises relay J, control operation circuit 2 is made up of several switch keys AN of parallel connection, be provided with in the control operation circuit 2 in parallel with switch key AN, the display circuit that constitutes by resistance and light-emitting diode.

Under the situation that mains switch disconnects at ordinary times, relay J is in relaxation state normally-closed contact J1 conducting, and direct current charge-discharge circuit 1 is in power supply state; The AN that pushes button, the relay J adhesive, normally opened contact J2 conducting, mains switch is opened, and load RL starts working, and DC power supply is in power supply state, makes relay J remain on attracting state, and direct current charge-discharge circuit 1 is in resting state, capacitor C 2 discharges; The AN that pushes button once more, the relay J both end voltage is because the instantaneous reduction of effect of C2 and R2, and relay J is loosened, the mains switch disconnection.

This utility model has the following advantages.

1, the function of power failure back automatic disconnection load;

When 2, civil power is low, cut off the function of load automatically;

3,2-3 interval second switch, the protecting against shock defencive function;

4, many controls realize that circuit is simple, only need two lead-out wires, can connect a plurality of control buttons between two lead-out wires;

5, circuit is simple and reliable, and cost is low.

The utility model is described in further detail below in conjunction with accompanying drawing.

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

Fig. 2 is embodiment circuit theory diagrams of the present utility model.

Utility model embodiment as shown in Figure 2, the live wire of civil power (phase line) is by the normally-closed contact J1 of relay J and by capacitor C 1 step-down, diode D1, the D2 rectification, resistance R 2 step-downs shunting back is to capacitor C 2 chargings, sufficient voltage discharges to the relay J anode by button AN, make relay J start adhesive, this moment, the normally-closed contact J1 of relay J moved to normally opened contact J2 position, make live wire pass through normally opened contact J2 and by capacitor C 3 step-downs, diode D3, D4 rectification, capacitor C 4 filtering, supply relay J adhesive self-locking after resistance R 4 current limlitings, and keep this state.Luminous tube LED1 non-transformer is powered and is extinguished at this moment, and luminous tube LED2, LED3 also extinguish because of reverse current, with expression external load RL on power supply.When pushing button AN, the positive terminal voltage of relay J because the C2 capacity is big, makes the instantaneous attract current that is lower than relay J that drops to of relay J electric current to capacitor C 2 chargings, so relay J discharges, the live wire of civil power passes through the normally-closed contact J1 of relay J, capacitor C 1 step-down, diode D1 again, the D2 rectification, starting relay J is for the second time waited for to capacitor C 2 chargings in resistance R 2 step-downs shunting back, opens external load RL.This moment, luminous tube LED1 got electroluminescence, and it is also luminous that LED2, LED3 get forward current, and the expression external load has disconnected the live wire of civil power.When line voltage is low, to produce for the relay J attract current is not enough, load circuit is cut off in the then normally opened contact J2 automatic disconnection of relay J, thus protection electrical equipment is unlikely because of low voltage operating and damages.When external load RL normally opens work and when having a power failure suddenly, because relay J does not have attract current and normally opened contact J2 automatic disconnection, so have the power saving function of power failure automatic disconnection.Because capacitor C 2 capacity are big, the C2 charge or discharge need the 2-3 time in second, so have 2 to 3 seconds between the Push And Release at interval, have the protecting against shock defencive function.When work, press button AN at every turn, the operating state of relay J changes once, the operating state of load RL is also changed once, once open or closing motion thereby finish, thereby the switch control of load RL can be carried out by a plurality of control buttons in parallel throughout in the two ends of button AN, and not disturbed by outer signals.Because the live wire of civil power is through capacitor C 1 or C3 step-down current limliting, the voltage at button AN two ends is very little, generally is about about 12V, so human body is not had the danger of electric shock.Rectification circuit 6 is made up of diode D1 and D2, the backward end of the forward end of diode D1 and diode D2 is connected of reduction voltage circuit and brings out end, the backward end of diode D1 is connected another output of reduction voltage circuit and constitutes the defeated end of a negative pole of rectification circuit, the positive pole that the forward end of diode D2 constitutes rectification circuit brings out end, diode D1 under this structure and D2 are difficult for breakdown, can use cheaply diode and only need two.

Embodiment as shown in Figure 2 can improve in the following areas.A kind of is that photosensitive, temperature-sensitive in parallel with switch key AN or other special components are set, and makes circuit have photosensitive, temperature-sensitive or other asc switch functions; Another kind is that special components or delay circuit such as photosensitive, temperature-sensitive in parallel with capacitor C 4 are set, and makes circuit have photosensitive, temperature-sensitive, time-delay or other asc switch functions.

Embodiment as shown in Figure 2 is suitable for most being fixedly mounted on wall or the furniture, as the mains switch of light fixture.

Claims

1, the mains switch of household electrical appliance, comprise the switch box body, switch key, fire ground access point and circuit part, it is characterized in that circuit part comprises direct current charge-discharge circuit (1) and the DC power supply circuit (3) to executive circuit (4) power supply, between direct current charge-discharge circuit (1) and executive circuit (4), be provided with control operation circuit (2), executive circuit (4) control civil power make contact J1 or J2, J1 connects direct current charge-discharge circuit (1), J2 connects DC power supply circuit (3) and load RL, connecting resistance R 2 and capacitor C 2 between the both positive and negative polarity of direct current charge-discharge circuit (1), executive circuit (4) comprises relay J, and control operation circuit (2) is made up of several switch keys AN of parallel connection.

2, the mains switch of household electrical appliance as claimed in claim 1 is characterized in that direct current charge-discharge circuit (1) is made of with filter circuit (7) reduction voltage circuit (5), rectification circuit (6), and reduction voltage circuit (5) makes the direct voltage of output be lower than safe voltage.

3, the mains switch of household electrical appliance as claimed in claim 1, it is characterized in that being provided with in the control operation circuit (2) in parallel with switch key AN, the display circuit that constitutes by resistance and light-emitting diode.

4, the mains switch of household electrical appliance as claimed in claim 1, it is characterized in that rectification circuit (6) is made up of diode D1 and D2, the backward end of the forward end of diode D1 and diode D2 is connected of reduction voltage circuit (5) and brings out end, the backward end of diode D1 is connected another output of reduction voltage circuit (5) and constitutes a cathode output end of rectification circuit (6), and the positive pole that the forward end of diode D2 constitutes rectification circuit (6) brings out end.

5, the mains switch of household electrical appliance as claimed in claim 1 is characterized in that being provided with the photosensitive or thermistor in parallel with switch key AN.

6, the mains switch of household electrical appliance as claimed in claim 1 is characterized in that being provided with delay circuit between the both positive and negative polarity of DC power supply circuit (3).

7, the mains switch of household electrical appliance as claimed in claim 1 is characterized in that being provided with photosensitive or thermistor between the both positive and negative polarity of DC power supply circuit (3).

8, the mains switch of household electrical appliance as claimed in claim 1 is characterized in that being fixedly mounted on wall or the furniture and load RL is a light fixture.