CN201178297Y

CN201178297Y - Motor driving protection circuit for household electrical appliance

Info

Publication number: CN201178297Y
Application number: CNU2008200921942U
Authority: CN
Inventors: 姜西辉; 刘建伟; 蒋洪波
Original assignee: Shenzhen H&T Intelligent Control Co Ltd
Current assignee: Shenzhen H&T Intelligent Control Co Ltd
Priority date: 2008-02-25
Filing date: 2008-02-25
Publication date: 2009-01-07
Anticipated expiration: 2018-02-25

Abstract

The utility mode discloses a motor driving protective circuit for a household appliance, which comprises a motor, and a motor trigger circuit connected with a controller. The motor trigger circuit includes a plurality of controlled silicon, a first relay with a normally-closed contact being connected with a DC power supply, and a second relay with a normally-opened contact being connected with the motor. A capacitor is connected in parallel at two ends of the winding lead of the first relay, and a single-pole double-throw switch is disposed between the capacitor and the relay. The base terminal of the single-pole double-throw switch is connected to the positive pole of the capacitor, the first throw thereof is connected with one winding lead of the relay, and the second throw thereof is connected with the DC power supply. The motor driving protective circuit can remove the potential safety hazard to a user, which is caused by the sudden re-operation of the motor under the condition that the power of the household appliance is restored after the electricity failure when in use.

Description

The motor-driven protective circuit that is used for household electrical appliances

Technical field

The utility model relates to the motor-driven protective circuit, relates in particular to a kind of motor-driven protective circuit that is used for household electrical appliances.

Background technology

Have in the use of household electrical appliance of motor at fruit juice mixer, mixer etc., can run into power failure or other unexpected situations inevitably quits work electrical equipment, and in this case, because each switch of electrical equipment all is in opening, after sending a telegram here again, electric equipment can rerun under the situation of no early warning automatically, brings potential safety hazard to the user.

The utility model content

Technical problem to be solved in the utility model is: provide a kind of motor-driven protective circuit, self-starting when this circuit can prevent to send a telegram here after household electrical appliance from use cutting off the power supply.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

A kind of motor-driven protective circuit that is used for household electrical appliances, the motor circuits for triggering that comprise motor and link to each other with controller, described motor circuits for triggering comprise a plurality of controllable silicons, first relay that its normally-closed contact links to each other with DC power supply, with and second relay that links to each other with motor of normally opened contact, wherein, coil pin two ends at described first relay are parallel with an electric capacity, and be provided with a single-pole double-throw switch (SPDT) between described electric capacity and relay, described single-pole double-throw switch (SPDT) tool rest end is connected the positive pole of electric capacity, it first is thrown with a coil pin of relay and links to each other, second throws with DC power supply and links to each other;

Preferably, also be parallel with a button reset circuit between the tool rest end of described single-pole double-throw switch (SPDT) and first is thrown, described button reset circuit comprises that the controllable silicon and the end that are connected with described single-pole double-throw switch (SPDT) are connected with described controllable silicon base stage, the button of other end ground connection.

The beneficial effects of the utility model are:

The utility model is by an electric capacity in parallel on the motor circuits for triggering, by the adhesive that discharges and recharges control relay of electric capacity, thereby avoided after the outage again under the situation of incoming call, and motor is running and the potential safety hazard brought to the user again suddenly.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Description of drawings

Fig. 1 is the circuit theory diagrams of the embodiment of motor-driven protective circuit that provides of the utility model.

Embodiment

With reference to figure 1, this figure is the circuit theory diagrams of the embodiment of motor-driven protective circuit that provides of the utility model; As shown in the figure, present embodiment comprises the motor circuits for triggering of being made up of with the first relay R Y1, the second relay R Y2 controllable silicon TR2, TR3, TR4, and the controlling object motor M OTOR of present embodiment is connected the electric main of 220VAC with normally-closed contact by the normally opened contact of relay R Y2; Two coil pin of relay R Y2 respectively; Be connected on the collector electrode of emitter, TR4 of controllable silicon TR2; Between the base stage of TR2 and emitter, be connected with current-limiting resistance R2, and the base stage of TR2 links to each other with the collector electrode of TR3 by current-limiting resistance R5, the base stage of controllable silicon TR3, TR4 is connected on port I/O2, the I/O3 of controller (not shown) by current-limiting resistance R6, R7 respectively, and its emission collection difference ground connection; The normally opened contact of relay R Y1 and normally-closed contact respectively with the collector electrode of TR2 and+the 12V DC power supply links to each other, its coil pin one end ground connection, the other end is thrown ON with first of single-pole double-throw switch (SPDT) SWITCH and is linked to each other, first of switch SW ITCH throws on the ON, the tool rest end of switch SW ITCH is connected the positive pole of capacitor C 2 and the collector electrode of TR2 is connected equally, and the negative pole of capacitor C 2 links to each other with the earth terminal of relay R Y1 coil; And second the throwing OFF and directly link to each other of switch SW ITCH with+12V DC power supply;

In addition, also be parallel with discharge diode D1, D2 on the coil pin of relay R Y1, RY2 respectively, the major function of D1, D2 is the electric charge at rapid release relay coil two ends, plays the effect of protection relay; And the positive pole of D2 is connected the emitter that collector electrode, the negative pole of controllable silicon TR4 are connected controllable silicon TR2.

In addition, tool rest end and first at the single-pole double-throw switch (SPDT) SWITCH of present embodiment is thrown between the ON, also be parallel with a switch reset circuit, described switch reset circuit comprises controllable silicon TR1, button KEY, the collector electrode of controllable silicon TR1 is thrown on the ON with the tool rest end and first that the emission collection is connected to switch SW ITCH, its base stage then is connected by current-limiting resistance R4 and the end of button KEY, and the other end of button KEY is ground connection then; In addition, described switch reset circuit also is provided with filter capacitor C1 and diode D3, the two ends of filter capacitor C1 link to each other with the port I/O1 of controller, the earth terminal of button KEY respectively, the positive pole of diode D3 is connected on the port I/O1 of controller equally, and its negative pole is connected between button KEY and the resistance R 4, in addition, positive pole at diode D3 also is provided with pull-up resistor R3, whether its effect is to detect button KEY to be triggered, and the effect of filter capacitor C1 is to filter the interference noise that enters director port.

Describe the operation principle of present embodiment in detail below in conjunction with accompanying drawing.

With reference to figure 1, when switch SW ITCH was in diagram OFF (shutdown) position ,+12VDC power supply charged to C2, the voltage at C2 two ends is reached+12VDC equally; And when SWITCH gets to the ON state by the OFF state, be stored in electric charge on the C2 rapidly to the coil discharge of relay R Y1, after making RY1 connect the RY1 connection, controller is then exported high level signal and is given port I/O2, thereby make the TR3 conducting make the TR2 conducting, after the TR2 conducting, can be relay R Y1 continues to provide+and the 12VDC power supply, make relay R Y1 continue conducting; And after RY1 continued conducting, can be relay R Y2 provided+the 12VDC power supply, and controller output this moment high level signal is given port I/O3, makes TR4 conducting, relay R Y2 closure, thereby makes supply line's closure of motor M OTOR, motor rotation; When SWITCH is in ON position, motor in the running, if circuit cuts off the power supply because of power failure or other reasons, then can cause relay R Y1 and RY2 all to disconnect, after re-powering in this state, because SWITCH also rests on the ON position, capacitor C 2 can not get charging, before SWITCH does not get back to the OFF position, RY1 and RY2 will be can be closed, then motor can not turn round;

And when switch SW ITCH is in the OFF position, trigger button KEY, can make base stage conducting of TR1 by R4 ground connection, for relay R Y1 provides+the 12VDC power supply, controller output this moment high level signal is given port I/O2, make the TR3 conducting, thereby make the TR2 conducting, after the TR2 conducting, can be relay R Y1 and continue to provide+the 12VDC power supply, make relay R Y1 continue conducting, and after RY1 continues conducting, can be relay R Y2 provides+the 12VDC power supply, and controller output this moment high level signal is given port I/O3, makes the TR4 conducting, relay R Y2 closure, thereby make supply line's closure of motor M OTOR, motor rotation;

And when switch SW ITCH was in the ON position, if re-power after the down circuitry, then because TR1 disconnects with+12VDC power supply, when triggering button KEY, TR1 can conducting, and motor also can not turn round.

In sum, promptly when motor in the running after running into outage again the incoming call situation, before switch SW ITCH got back to the OFF position, motor can not turn round, thereby avoided after the outage again under the situation of incoming call, motor is running and the potential safety hazard brought to the user again suddenly.

Present embodiment switch and button have interlock function, realized simultaneously switch button is not opened or situation about not triggering under, the motor circuit is to cut off by hardware or mechanical structure, and not exclusively is to control by software program; Avoided after the outage again under the situation of incoming call, motor is running and the potential safety hazard brought to the user again suddenly; And the user can select to trigger button KEY or switch SW ITCH restarts motor, and flexible function is easy to use.

The above is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.

Claims

1; a kind of motor-driven protective circuit that is used for household electrical appliances; the motor circuits for triggering that comprise motor and link to each other with controller; described motor circuits for triggering comprise a plurality of controllable silicons; first relay that its normally-closed contact links to each other with DC power supply; with and second relay that links to each other with motor of normally opened contact; it is characterized in that: the coil pin two ends at described first relay are parallel with an electric capacity; and be provided with a single-pole double-throw switch (SPDT) between described electric capacity and relay, the tool rest end of described single-pole double-throw switch (SPDT) is connected the positive pole of electric capacity; and it first is thrown with a coil pin of relay and links to each other; second throws with DC power supply and links to each other.

2, the motor-driven protective circuit that is used for household electrical appliances as claimed in claim 1; it is characterized in that; also be parallel with a button reset circuit between the tool rest end of described single-pole double-throw switch (SPDT) and first is thrown, described button reset circuit comprises that the controllable silicon and the end that are connected with described single-pole double-throw switch (SPDT) are connected with described controllable silicon base stage, the button of other end ground connection.

3, the motor-driven protective circuit that is used for household electrical appliances as claimed in claim 1 or 2 is characterized in that, described electric capacity two ends also are parallel with a discharge resistance.

4, the motor-driven protective circuit that is used for household electrical appliances as claimed in claim 1 or 2 is characterized in that, each silicon controlled base stage is respectively arranged with current-limiting resistance in described circuit.

5, the motor-driven protective circuit that is used for household electrical appliances as claimed in claim 1 or 2 is characterized in that, the coil pin end of each relay also is connected with a discharge diode respectively in described circuit.

6, the motor-driven protective circuit that is used for household electrical appliances as claimed in claim 2; it is characterized in that; two ends at described button are connected with filter capacitor and diode respectively, are provided with a pull-up resistor between described filter capacitor and the diode, and are connected with a port of controller by lead.