CN2149702Y

CN2149702Y - Protective circuit arrangement for domestic electric appliance with time accumulation function

Info

Publication number: CN2149702Y
Application number: CN 93230203
Authority: CN
Inventors: 张希文
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-11
Filing date: 1993-02-11
Publication date: 1993-12-15
Anticipated expiration: 2003-02-11

Abstract

The utility model belongs to a household appliance protecting field which is composed of an automatic control circuit part and an electric accumulating and timing part, wherein, the automatic control circuit comprises a power circuit, a state display circuit, an over voltage, excess voltage, and time delay protecting circuit, a timing circuit and a lighting protecting circuit, and an electric timing mechanism comprises a timing drive motor and a rotary wheel type counter. The utility model has various protecting functions and also has an accumulating and timing function, the starting operating time of the household appliance can be automatically accumulated and recorded, and the utility model provides objective and exact reference for the judgment of the product quality, the maintenance and the use of the household appliance. Meanwhile, as the circuit is simple, the cost is low, and the utility model has the strong competitive power in the like product. The utility model is particularly suitable for refrigerators, televisions, etc.

Description

Protective circuit arrangement for domestic electric appliance with time accumulation function

The utility model relates to timing of household electrical appliances operating time and protective device, particularly a kind of household electrical appliances accumulation timing protector, and it can accumulate timing, has overvoltage, under-voltage, time-delay and anti-lightning strike function again.

Along with the widespread usage of household electrical appliance such as refrigerator, television set, various types of families non-electricity protector appears on the market in succession.These protectors mainly design for overvoltage, under-voltage and delay protection, and what have has the thunderbolt function concurrently.Its weak point is to realize the accumulation timing to the start operating time of household electrical appliances.Switzerland ETA Draft Manufacturing Corp. is in a patent of China's application, and application number is " 911059261 ", and open day is " 92,3,4, ", and title is " an electromechanical timepiece.It comes down to a kind of mechano-electronic table, and by movement, resonator and control device constitute, and can only utilize powered battery, and it can not be used for household electrical appliances start accumulation timing automatically, does not more possess overvoltage, under-voltage, time-delay and defencive function such as anti-lightning strike.

The purpose of this utility model just is the shortcoming and defect part at above-mentioned prior art, provides a kind of household electrical appliances accumulation timing to protect device.It can be to household electrical appliances start work accumulation timing, can realize again overvoltage, under-voltage, the time and kinds of protect such as anti-lightning strike, thereby solve household electrical appliances timing and two technical problems of protection effectively.

Above-mentioned purpose of the present utility model is achieved through the following technical solutions.This timing protector is made up of automatic control circuit and two big portions of electric timekeeping mechanism.Wherein automatic control circuit comprises power circuit, status display circuit, overvoltage, under-voltage and delay protection circuit, timing circuit and lightning prevention circuit; Electric timekeeping mechanism comprises timing drive motor and rotary-type counter.Power circuit comprises ac power circuit and DC power-supply circuit.Ac power circuit is the timing drive motor power supply of household electrical appliance and time movement, and DC power-supply circuit is display circuit, protective circuit and timing circuit power supply.The control of display circuit protected circuit and timing circuit, show respectively overvoltage, under-voltage, stop timing and normal three kinds of states of timing.Protective circuit is controlled by line voltage.Timing circuit is controlled by the household electrical appliance mains switch, and the timing drive motor is controlled by timing circuit.

The ac power circuit of above-mentioned power circuit is made up of the normally opened contact and the fuse of master switch start button, two relays, and DC power-supply circuit is made up of power transformer, fuse, rectifier cell and filter capacitor.

The mistake of above-mentioned display circuit, under-voltage demonstration are propped up normally-closed contact, light-emitting diode and the current-limiting circuit resistance of route protective circuit relay and are formed; stop normally-closed contact, light-emitting diode and current-limiting resistance composition that timing showing a route timing circuit relay, normally opened contact, light-emitting diode and the current-limiting resistance of a normal timing demonstration route timing circuit relay are formed.

Above-mentioned mistake, under-voltage and delay protection circuit are made up of two-stage switching circuit, two voltage stabilizing didoes, relay, potentiometer, switch and resistance, capacity cell.

Above-mentioned timing circuit is made up of triode, voltage-stabiliser tube, relay, potentiometer and household electrical appliances starting-up signal transducer.Household electrical appliances starting-up signal transducer wherein is made up of supply socket, signal transformer, rectifier cell and filter capacitor.

Above-mentioned lightning prevention circuit adopts pressure cell, is connected across after the fuse of ac power circuit, between the live wire and zero line before the drive motors.

The utility model and the non-electricity protector contrast of existing family; not only have overvoltage, under-voltage, time-delay, standing function such as anti-lightning strike; and has a start work accumulation clocking capability; can note the real work time of each home appliance accurately and reliably; objective notarization ground reflects the quality of household appliances quality; avoid producing, sell, purchase not having according to the dispute that can comply with between the three and take place, also for the user use and maintenance provides reliable basis.Simultaneously also to have a circuit simple, reasonable in design for the utility model, and cost is low holds concurrently, and advantages such as self little power consumption have stronger competitiveness after therefore putting on market.

Accompanying drawing is a basic circuit diagram of the present utility model.

Details are as follows to embodiment in conjunction with the accompanying drawings.

This timing protector is made up of automatic control circuit and the two large divisions of electric timekeeping mechanism.Only drawn the drive motors M of automatic control circuit and electric timekeeping mechanism among the figure, rotary-type counter is not drawn.Wherein, the 1st, power circuit, the 2nd, status display circuit, the 3rd,, under-voltage and delay protection circuit, the 4th, the starting-up signal transducer of timing circuit, the 5th, timing circuit, R _YAnti-lightning strike piezo-resistance.

Its course of work principle is: if be used for refrigerator, need delay protection, K switch ₂Close.Under the normal situation of line voltage, master switch K closes ₁, press start button AN AC power again and promptly be switched on, through transformer B ₁Step-down is again through bridge rectifier element QL ₁Rectification and capacitor C ₁Filtering becomes 12 volts of DC power supply, is the each several part circuit supply.This moment triode BG ₁, end BG ₂Conducting.Relay J ₁Must be electric, normally opened contact J _1-1, adhesive, normally-closed contact J _1-2Discharge light-emitting diode D ₁Put out by bright change.Because transformer B ₂Former limit winding string on AC Power supply socket, constitute the loop, thus as long as power consumption equipment start work, transformer B ₂Former limit winding string on AC Power supply socket, constitute the loop, thus as long as power consumption equipment start work, transformer B ₂The secondary winding just have ac voltage signal to produce.This signal is through bridge rectifier element QL ₂Rectification and capacitor C ₄Filtering is regulated through the potentiometer dividing potential drop again, makes triode BG just ₃Conducting makes relay J ₂Must be electric, normally opened contact J _2-1And J _2-3Adhesive simultaneously, normally-closed contact J _2-2Discharge simultaneously.This moment, the timing drive motor M got electric drive rotary-type counter running counting.Light-emitting diode D ₃Shinny, D ₂Do not work, be normal timing and voltage normal condition.

When line voltage surpasses permissible value (more than 250V), DC power supply voltage also just surpasses normal value (more than 14V).This just makes voltage-stabiliser tube D ₄The reverse breakdown conducting, triode BG ₁Become conducting state by cut-off state, make triode BG ₂Become cut-off state by conducting state, relay J ₁Dead electricity, J _1-1Become release condition by adhesive, AC power is disconnected J _1-2Become attracting state by release, because capacitor C ₁Positive pole has residual charge, can make D ₁Keep a little while luminously, show overvoltage condition.Stop timing this moment.

When electrical network forces down in permissible value (below 170V), DC power supply voltage also just is lower than normal value (below 10V).Though BG at this moment ₁Still keep cut-off state, but because this voltage has dropped to the degree that can not make the D5 reverse breakdown.So BG ₂Transfer to by conducting and to end, make J ₁Dead electricity, J _1-1Disconnect, adhesive, with Ac Dump, D ₁A little while bright, show under-voltage condition.Timing this moment also stops.

Delay protection is by capacitor C ₃And resistance R ₅Realize.At K ₂Under the situation of closing, behind the power system restoration normal power supply, DC power supply is through R ₅---K ₂---C ₃The loop is to C ₃Charging is when being charged to a certain degree BG ₂The ability conducting recovers Alternating Current Power Supply, by charge constant R ₅C ₃Decide delay time length, be generally about 5 minutes, this is favourable to compressor for refrigeration.

Anti-lightning strike function is by piezo-resistance R _YRealize.If have thunderbolt superhigh pressure signal to enter suddenly, because R from electrical network _YResponse is exceedingly fast, across R _YThe big electric current of moment impact that the moment superhigh pressure signal at two ends causes almost all passes through R _YShunting, RD ₁Fusing can not burn out that electricity consumption is established and timing drive motor and control circuit, prevents the purpose of being struck by lightning thereby reach.

Claims

1; a kind of household electrical appliances accumulation timing protector; form by automatic control circuit and the two large divisions of electric timekeeping mechanism; it is characterized in that automatic control circuit comprises power circuit; state shows the road circuit; overvoltage; under-voltage and delay protection circuit; timing circuit and lightning prevention circuit; electric timekeeping mechanism comprises timing drive motor and rotary-type counter; ac power circuit in the power circuit is household electrical appliance and the power supply of timing drive motor; DC power-supply circuit is a display circuit; protective circuit and timing circuit power supply; display circuit protected circuit and timing circuit control; protective circuit is subjected to power grid control; timing circuit is controlled by the household electrical appliance power switch, and the timing drive motor is controlled by timing circuit.

2, according to the described household electrical appliances accumulation of claim 1 timing protector; the ac power circuit that it is characterized in that power circuit is made up of the normally opened contact and the fuse of master switch, start button, two relays, and DC power-supply circuit is made up of power transformer, fuse, rectifier cell and filter capacitor.

3, according to the described household electrical appliances accumulation of claim 1 timing protector; it is characterized in that the normally-closed contact of route protective circuit relay, Light-Emitting Diode are propped up in the mistake of display circuit, under-voltage demonstration and current-limiting resistance is formed, stop normally-closed contact, light-emitting diode and current-limiting resistance that timing showing a route timing circuit relay and form.

4,, it is characterized in that, under-voltage and delay protection circuit is made up of two-stage switching circuit, two zener diodes, relay, potentiometer, switch and resistance, electric capacity according to the described household electrical appliances of claim 1 accumulation timing protector.

5, according to the described household electrical appliances accumulation of claim 1 timing protector; it is characterized in that timing circuit is made up of triode, voltage-stabiliser tube, relay, potentiometer and household electrical appliances starting-up signal transducer, household electrical appliances starting-up signal transducer wherein is made up of supply socket, signal transformer, rectifier cell and filter capacitor.

6, according to the described household electrical appliances accumulation of claim 1 timing protector, it is characterized in that lightning prevention circuit adopts pressure cell, be connected across after the fuse of ac power circuit, between the live wire and zero line before the drive motors.