CN2095498U - Timed life prolonging device for program control type elctric appliance - Google Patents

Abstract

The utility model provides a device which can avoid the electric appliance at power on suffering from the influence of the strong current and overvoltage. The device is provided with a casing; the front face of the casing is provided with a timer and a keystroke; the side face of the casing is provided with an output socket for power supply; the inner part of the casing is provided with a negative temperature coefficient thermistor R2 and a negative temperature coefficient thermistor R3 which are respectively connected in series with the phase line and the zero line of a power supply line; the front of the R2 and the R3 is provided with a voltage sensing element R1 between the phase line and the zero line; the phase line and the zero line at the front of the R1 are provided with a linkage start button n1 and a linkage start button N2; the R2, the R3, the N1, and the N2 respectively are connected in parallel with a group of four contact points which are controlled a relay J in a control circuit; the control circuit can be positioned at the front of the R2 and the R3 or the control circuit can also be positioned at the rear part of the R2 and the R3.

Description

Timed life prolonging device for program control type elctric appliance

The utility model belongs to a kind of electrical equipment auxiliary.

Existing electrical equipment all has two fatal problems in use: the heavy current during start is to the influence to electronic component of the switching overvoltage of the impact of electronic component and power supply grid and lightning strike induction voltage.For this reason, someone has designed some and has managed to avoid making electrical equipment to suffer the device of this impact and influence, see Chinese patent 89212275.7, as shown in Figure 1: it is each negative temperature coefficient thermistor RA, a RB on the phase line of power line and zero line, connects a voltage sensitive element RC between phase line after RA, the RB and the zero line, on phase line and zero line, RA, RB respectively have the button switch K of a linkage before, A is the input of power line among the figure, and B is an output.This K switch is when closure, electrode a, c point first and on RA, the RB contacts, disconnect with it then, contact with electrode b, d point on the zero line with phase line again, this opening process makes source current earlier through entering in the machine again behind the negative temperature coefficient thermistor, thereafter more described thermistor is got rid of, in the direct machine of electric current.

Like this, in the moment of start, element and picture tube filament are cold conditions in the machine, its resistance value is very little, because this thermistor is serially connected in the circuit, entire circuit has big resistance, and electric current can only enter in the television set " steadily ", afterwards, element and picture tube are because of heating in the machine, and its resistance value enters the nominal operation state thereupon increasing, at this moment, thermistor reduces because of its negative temperature coefficient feature resistance, and entire circuit still keeps-the resistance value state.Then, thermistor is quit work by short circuit, and source current directly enters self-contained circuit, and this course of work can effectively avoid television set to open the generation of moment " impulse current ".

Between the power line and after connecing a voltage sensitive element, make its conducting voluntarily under overvoltage condition, thereby the protection television set is not subjected to the infringement of too high voltages.This patent illustrates that also described switch, electrode, resistance all are installed in the housing, and in the housing front button is set, and the side is provided with supply hub.

The shortcoming of this patent be the switching of power supply by manual operations, the action of its switch is a mechanical system.

The purpose of this utility model is that design a kind ofly can be avoided heavy current surge and over-voltage protection, and the program control type electrical equipment that can on time cut off the electricity supply automatically again is life extender regularly.

Its main feature is: voltage sensitive element R1 is positioned at before thermistor R2, the R3; start button N1, N2 that linkage is arranged respectively on phase line before the R1 and zero line; one group of contact J-1, J-2, J-3, J-4 respectively in parallel on R2, R3, N1, N2 by relay J control, and behind R2, R3 or precedingly have one by current rectifying and wave filtering circuit, regularly display circuit, excess voltage protection and include the control circuit that the delay executing circuit of relay J constitutes.

The action that the utility model has the advantages that switch has realized program control, and overvoltage is cut off the power supply automatically, and can timing automatic cut off the electricity supply.

Fig. 1 is the original protector schematic diagram of lengthening the life

Fig. 2 is an outline drawing of the present utility model.

Fig. 3 is a Figure of abstract for line map of the present utility model.

Fig. 4 is the control circuit schematic diagram among Fig. 3.

Fig. 5 is another control circuit schematic diagram.

As shown in Figure 2: there are timer 2 and button 4 in the front of housing 1, and there are power input line 3 and accessory power outlet 5 in the side.

Power supply is by A end (corresponding to incoming line among Fig. 2 3) input of power line among Fig. 3; B end (corresponding to accessory power outlet among Fig. 2 5) output; on the phase line of power line and zero line, be connected in series negative tempperature coefficient thermistor R2 respectively; R3; between phase line and zero line; R2; voltage sensitive element R1 is arranged before the R3; the start button N1 that linkage is arranged respectively on phase line before the R1 and zero line; N2(is corresponding to the button among Fig. 2 4); at R2; R3; N1; one group of contact J-1 of the last parallel connection respectively of N2 by the control of the relay J in the control circuit; J-2; J-3; J-4; at R2; there is one before the R3 by current rectifying and wave filtering circuit; the timing display circuit; excess voltage protection and include the control circuit that the delay executing circuit of relay J is formed has fusible link FS on the phase line before the R1.

Among Fig. 4, B, D1, D2, D3, C2 form power supply rectification filter circuit, for the The whole control device provides operating voltage.

Regularly display circuit by program control timing ic LM8361, time display screen FR1094-14T(corresponding to the timer among Fig. 2 2), R4, C1, R5, N3, N4 constitute, wherein R4, C1, for timing ic provides time-base signal by mains frequency decision, N3, N4(are corresponding to the button among Fig. 2 4) be respectively the fast mediation of using when regularly being provided with and transfer button slowly.

Delay executing circuit is made of R8-10, G2, G3, C4, J.When entire circuit had just been switched on, 25 pin of LM8361 were low level, and G2 ends, R10 charges to C4, and before voltage did not reach the G3 conducting voltage on C4, G3 ended, J is failure to actuate, J-3, the J-4 contact is not closed, and AC power is passed through R2, two thermistors of R3 are powered to electrical appliance (as television set), limited the impulse current of start moment effectively, when the C4 both end voltage reaches the G3 conducting voltage, the G3 conducting, the J action, J-1, the J-2 closure makes the circuit self-insurance, J-3, the J-4 closure, make R2, the R3 short circuit, thereby line voltage all is added on the electrical appliance, makes the electrical appliance operate as normal, during the timing of setting, 25 pin of LM8361 are low level always, when timing arrives, 25 pin of LM8361 output high level, G2 conducting, G3 ends, the J outage, J-1, J-2, J-3, J-4 all disconnects, and cuts off general supply.

C3, R6, R7, G1 are overvoltage detection circuits among Fig. 4; line voltage just often; the G1 base voltage is lower, and G1 ends, and G3 is not controlled by G1; when line voltage is elevated to 260V when above; the G1 conducting, G3 ends, and makes the J action; cut off general supply; reach the purpose of overvoltage protection, the effect of C3 is the filtering interfering pulse and makes time-delay usefulness, if in 1 second; line voltage can be got back to 220V from 260V; then G1 will end, and general supply can not be cut off, if line voltage does not reduce after 1 second; then be judged as overvoltage, general supply is cut off.

The prevention of thunderbolt is finished by zinc oxide voltage sensitive element R1, when thunder and lightning seals in from electrical network, and the R1 conducting, big electric current will make fusible link FS burn, thus the safety of protection electrical appliance.

Among Fig. 5, control circuit is made up of current rectifying and wave filtering circuit, NE555 timing circuit integrated package and executive component J, and the adjusting of timing realizes by variable resistor W.

Claims (2)

1, a kind of program control type electrical equipment is life extender regularly, the button 4 in housing 1 and front thereof and the supply socket 5 of side are arranged, the phase line that is serially connected in power line respectively and the negative tempperature coefficient thermistor R2 on the zero line are arranged in housing 1 inside, R3, voltage sensitive element R1 is arranged between phase line and zero line, it is characterized in that: R1 is positioned at R2, before the R3, the start button N1 that linkage is arranged respectively on phase line before the R1 and zero line, N2, at R2, R3, N1, one group of contact J-1 of the last parallel connection respectively of N2 by control circuit repeat circuit J control, J-2, J-3, J-4, and at R2,1 control circuit is arranged before or after the R3.

2, life extender according to claim 1 is characterized in that: control circuit is made up of current rectifying and wave filtering circuit, timing circuit, excess voltage protection and delay executing circuit.

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