CN201797561U - Automatic switch-off and delay protector for multimedia equipment - Google Patents

Abstract

The utility model relates to an automatic switch-off and delay protector for multimedia equipment, which mainly solves the problems of waste of electric energy, shortened service life of equipment and even danger of fire due to the fact that a teacher probably forgets to switch off a multimedia central controller for teaching after class as currently the multimedia central controller in market does not have the function of automatically switching off a power supply. A protection circuit of the automatic switch-off and delay protector consists of an alternating-current contactor, a normally open button switch, a relay, a timing circuit, an interface and the like. The principle of the automatic switch-off and delay protector includes that the timing circuit automatically generates a control signal to control the relay, the relay controls sucking and releasing of the alternating-current contactor, and accordingly automatic switch-off and delay of a power supply are realized.

Description

Multimedia equipment is closed and the delay protection device automatically

Technical field the utility model belongs to " electronics " technical field, relates to a kind of protector, is that a kind of electronics of multimedia special use is controlled powered-down and delay control circuit automatically specifically.

Background technology multimedia central controller in the market all is not with the function of automatic powered-down, even shut down, and central controller still is in electriferous state, has waste electric energy and dangerous shortcoming.

Summary of the invention problem to be solved in the utility model is to overcome the function shortcoming that multimedia central controller in the market exists---promptly can not the self-timing powered-down, a kind of electronic protector with self-timing powered-down and delay protection function simple in structure, with low cost is provided.This protector partly is made of housing, circuit board, A.C. contactor, normally open push button switch etc.The mentality of designing of self-timing powered-down part is: with timing circuit control ac contactor coil current supply circuit, when normally open push button switch is pressed, first timing circuit picks up counting, after timing finishes, timing circuit output low-potential signal discharges first relay, the ac contactor coil current supply circuit disconnects, thereby the power supply of realizing multimedia system is closed automatically.The mentality of designing of projecting apparatus time-delay part is: after first relay disconnected, second timing circuit picked up counting, and the projecting apparatus power supply continues; When the timing circuit timing finished, output electronegative potential control signal discharged second relay, the projecting apparatus outage.

The utility model multimedia equipment is closed and the delay protection device automatically, removes self-timing closing device power supply, and it is small and exquisite also to have a volume, and interface is simple, and the characteristics that power consumption is low are by changing the time that parameter can free conversion be closed automatically and delayed time.

Description of drawings Fig. 1 is circuit theory diagrams;

Fig. 2 is the internal structure schematic diagram;

Fig. 3 is a left view;

Fig. 4 is a vertical view.

Embodiment is seen Fig. 1, entire circuit mainly comprise two timing circuits 6. 3., four contact A.C. contactors 2., start button (often opening) switch 1. and Temporarily Closed (normally closed) switch 7. form.The self-timing shut-off circuit is by 1., 2., 5., 6., 7. form, operation principle: press switch during work 1., K5, the K6 closure, A.C. contactor 2. coil L is connected the 220V power supply, the A.C. contactor adhesive, contact K1, K2, K3, K4 connects, the whole system energized, this moment, timing circuit is the input zero potential 6. owing to the K6 closure, output output high potential, the J1 adhesive, J1-K connects, and this moment is by K4, J1-K, 7. form another to A.C. contactor L current supply circuit, when release button 1. the time, because J1 has been in attracting state, so 2. A.C. contactor continue adhesive and keep system in "on" position, and this moment, K6 disconnected, the 12V electric current begins to C3 charging by R2, when capacitor C 3 power on press rise to supply voltage 2/3 the time.555 the 3rd pin output electronegative potentials, relay J 1 discharges, and J1-K disconnects, and cuts off 2. coil L current supply circuit of A.C. contactor, and A.C. contactor discharges, and cuts off 5. power supply of insert row.3. the projecting apparatus delay circuit when 2. contact K1 disconnects, 3. imports timing signal to circuit at A.C. contactor, and J2 discharged after 3. delay circuit delayed time three minutes, and J2-K disconnects, and cuts off insert row power supply 4., and so far, entire equipment is all under electroless state.7. normally closed switch is connected on A.C. contactor 2. in the coil L current supply circuit, as the usefulness of closing immediately,

See Fig. 2, Fig. 3, Fig. 4, A.C. contactor 9., circuit board

Be fixed on housing inside 8., often open button 1., 7. instant X button be embedded in housing front 8., power interface 10., insert row interface 4.

Insert row interface 5.

Be embedded in the housing left surface.

Claims (1)

1. a multimedia equipment is closed and the delay protection device automatically; partly constitute by A.C. contactor, normally open push button switch, relay, timing circuit, interface etc.; it is characterized in that producing the control signal control relay, control the adhesive and the release of A.C. contactor again by relay by timing circuit.

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