CN2514551Y

CN2514551Y - Safety timing automatic change-over control switch

Info

Publication number: CN2514551Y
Application number: CN 01254570
Authority: CN
Inventors: 李木水
Original assignee: TONGXIANG WANDALI ELECTRICAL APPLIANCES CO Ltd
Current assignee: TONGXIANG WANDALI ELECTRICAL APPLIANCES CO Ltd
Priority date: 2001-11-05
Filing date: 2001-11-05
Publication date: 2002-10-02
Anticipated expiration: 2011-11-05

Abstract

The utility model discloses a safely-timing automatic change-over control switch, which comprises a casing, a control circuit, an operating button and an indicating lamp. The control circuit comprises a timing circuit, a silicon controlled circuit I, a silicon controlled circuit II, and a loading guard line, wherein the silicon controlled circuit I is connected with the loading guard line and the silicon controlled circuit II which is further connected with the timing circuit. The utility model has excellent functions of preventing fires and automatically cutting off loading circuits, which is very applicable for electric heating blankets and similar products.

Description

Safe timing automatic conversion controling switch

Technical field

The utility model relates to a kind of automatic control switch, specifically a kind of safe timing automatic conversion controling switch that is used for electric blanket and similar products.

Background technology

Existing common electric blanket and similar products thereof are in use often because some following factors and initiation fire accident, and these factors comprise that heating wire is close around, heating wire fracture of wire arcing, electric blanket multilayer folding, long-term heating etc.

Summary of the invention

The technical problems to be solved in the utility model is at above-mentioned deficiency, designs the higher safe timing automatic conversion controling switch of a kind of fail safe, to solve electric blanket and similar products hidden danger on fire in use.

Embodiment of the present utility model is: it comprises shell, control circuit, operating knob and indicator light; control circuit comprises timing circuit, ghyristor circuit I, ghyristor circuit II and load protection line; ghyristor circuit I links to each other with load protection line and ghyristor circuit II, and ghyristor circuit II links to each other with timing circuit.

Advantage of the present utility model: the one, have prevent heating wire close around locate, the burst temperature rises so high the hidden danger of bringing on fire, the 2nd, have the accident on fire that prevents that the arcing of heating wire fracture of wire from causing, the 3rd, can be transformed into low-grade keeping warm mode (half-power) from high-grade (total power) automatically, the 4th, can the timing turning off load power source on low grade.

Description of drawings

Fig. 1 is safe timing automatic conversion controling switch circuit theory diagrams.

Fig. 2 is safe timing automatic conversion controling switch contour structures schematic diagram.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in the figure; the utility model comprises shell 3, control circuit, operating knob 4 and indicator light 5; control circuit comprises timing circuit, ghyristor circuit I, ghyristor circuit II and load protection line A; ghyristor circuit I links to each other with load protection line A and ghyristor circuit II, and ghyristor circuit II links to each other with timing circuit.

Ghyristor circuit I comprises unidirectional controllable silicon S CR1 and diode D2, D3; resistance R 2, R3, capacitor C 1, protective tube Rd; unidirectional controllable silicon S CR1 one end links to each other with resistance R 2; the other end links to each other with diode D3, capacitor C 1, and the trigger electrode of unidirectional controllable silicon S CR1 links to each other with diode D2 and load protection line A respectively by resistance R 3.

Timing circuit comprises integrated circuit (IC), resistance R 5, R7, capacitor C 2, C3, voltage stabilizing didoe Dw, reset switch K2, adjusts K switch 1 with the gear of reset switch K2 interlock, be connected with resistance R 5, R7, capacitor C 2, C3, voltage stabilizing didoe Dw, reset switch K2 on the integrated circuit (IC) respectively, reset switch K2 is in parallel with capacitor C 2, and gear is adjusted K switch 1 to be had top grade, low grade and cut off shelves.

Ghyristor circuit II comprises unidirectional controllable silicon S CR2, diode D1, D4, D5, resistance R 1, R4, R6 and LED, the end of unidirectional controllable silicon S CR2 links to each other with diode D5, the other end of unidirectional controllable silicon S CR2 links to each other with capacitor C 2, C3, resistance R 4, the trigger electrode of unidirectional controllable silicon S CR2 links to each other with 1 pin of integrated circuit (IC) by resistance R 6, one end of LED links to each other with unidirectional controllable silicon S CR2 by resistance R 1, the other end of LED links to each other with diode D4, and diode D1 links to each other with diode D4.

Control circuit also comprises load RL and power supply, and the end of load RL links to each other with unidirectional controllable silicon S CR2, and the other end of load RL links to each other with unidirectional controllable silicon S CR1 by resistance R 2.

Operating knob 4, indicator light 5 are done on shell 3.One termination of shell 3 has plug cord 1, and shell 3 other ends are connected to load line 6, and the heart yearn of load line 6 has three, is respectively heart yearn a, heart yearn b, heart yearn c, and heart yearn a links to each other with load protection line A, and heart yearn b, heart yearn c and load RL join.Have louvre 2 on the shell 3.Load line protective wire A joins end to end.

Operation principle of the present utility model is: the power supply of alternating current 220V, 50Hz inserts reset switch K2 and gear is adjusted the low-grade or high-grade of K switch 1 (K1 and K2 are interlocks), timing circuit, ghyristor circuit II are in running order, load RL obtains electricity work, and this moment, ghyristor circuit I did not work.By diode D5, unidirectional controllable silicon S CR2 the positive-negative half-cycle of alternating current is separated, the turn-on and turn-off of a half cycle of unidirectional controllable silicon S CR2 control, diode D1, D5 control the turn-on and turn-off of another half cycle.Adjust the interlock of K switch 1 by reset switch K2 and gear, shift top grade or low grade onto by operating knob 4, just can be implemented in high-grade automatic conversion and in the timing cutting power function of low-grade location, and LED represented the realization of auto-conversion function by bright deepening.When will will changing automatically and timing cutting power when resetting again, cut off shelves as long as operating knob 4 is allocated to, make reset switch K2 to capacitor C 2 zero clearings, be allocated to former gear again and get final product.

The controllable silicon circuit I is not just often worked; when heating wire causes temperature too high owing to a variety of causes; make the insulating barrier of heating wire melt; cause heating wire directly to contact with load protection line A; the touch voltage of its contact point needs only the trigger voltage greater than unidirectional controllable silicon S CR1; unidirectional controllable silicon S CR1 conducting, protective tube Rd fusing, load RL dead electricity.When the touch voltage of the contact point conducting voltage less than unidirectional controllable silicon S CR1, the half cycle power supply by diode D5 to diode D2, D1, makes protective tube Rd fusing through contact point, load RL dead electricity.Therefore, load protection line A has played the effect that prevents that load is on fire with combining of ghyristor circuit I.Resistance R 2 is as the current-limiting resistance of unidirectional controllable silicon S CR1 in ghyristor circuit 1, and protection unidirectional controllable silicon S CR1 is not damaged.

Frame of broken lines is as shown in fig. 1 represented double-deck heating line.

As with the x among Fig. 1, the short circuit of y place, the w place disconnects, and then can form another independently safety protection switch.

Claims

1, a kind of safe timing automatic conversion controling switch; it comprises shell, control circuit, operating knob and indicator light; it is characterized in that control circuit comprises timing circuit, ghyristor circuit I, ghyristor circuit II and load protection line; ghyristor circuit I links to each other with load protection line and ghyristor circuit II, and ghyristor circuit II links to each other with timing circuit.

2, safe timing automatic conversion controling switch according to claim 1; it is characterized in that ghyristor circuit I comprises unidirectional controllable silicon S CR1 and diode D2, D3; resistance R 2, R3, capacitor C 1, protective tube Rd; unidirectional controllable silicon S CR1 one end links to each other with resistance R 2; the other end links to each other with diode D3, capacitor C 1, and the trigger electrode of unidirectional controllable silicon S CR1 links to each other with diode D2 and load protection line respectively by resistance R 3.

3, safe timing automatic conversion controling switch according to claim 1, it is characterized in that timing circuit comprises integrated circuit (IC), resistance R 5, R7, capacitor C 2, C3, voltage stabilizing didoe Dw, reset switch K2, adjusts K switch 1 with the gear of reset switch K2 interlock, be connected with resistance R 5, R7, capacitor C 2, C3, voltage stabilizing didoe Dw, reset switch K2 on the integrated circuit (IC) respectively, reset switch K2 is in parallel with capacitor C 2, and gear is adjusted K switch 1 to be had top grade, low grade and cut off shelves.

4, according to claim 1 or 3 described safe timing automatic conversion controling switch, it is characterized in that ghyristor circuit II comprises unidirectional controllable silicon S CR2, diode D1, D4, D5, resistance R 1, R4, R6 and LED, the end of unidirectional controllable silicon S CR2 links to each other with diode D5, the other end of unidirectional controllable silicon S CR2 and capacitor C 2, C3, resistance R 4 links to each other, the trigger electrode of unidirectional controllable silicon S CR2 links to each other with 1 pin of integrated circuit (IC) by resistance R 6, one end of LED links to each other with unidirectional controllable silicon S CR2 by resistance R 1, the other end of LED links to each other with diode D4, and diode D1 links to each other with diode D4.

5, safe timing automatic conversion controling switch according to claim 1 is characterized in that control circuit also comprises load RL and power supply, and the end of load RL links to each other with ghyristor circuit II, and the other end ghyristor circuit I of load RL links to each other.

6, safe according to claim 1 or 5 timing automatic conversion controling switch; a termination that it is characterized in that shell has plug cord; the other end of shell is connected to load line; the heart yearn of load line has three; one links to each other with the load protection line; in addition two join with load RL, have louvre on the shell.

7, safe timing automatic conversion controling switch according to claim 1 is characterized in that operating knob, indicator light do on shell.

8, safe timing automatic conversion controling switch according to claim 1 is characterized in that joining end to end of load line protective wire.