CN2304213Y - Safety protective switch for electric-heating blanket - Google Patents
Safety protective switch for electric-heating blanket Download PDFInfo
- Publication number
- CN2304213Y CN2304213Y CN 97214935 CN97214935U CN2304213Y CN 2304213 Y CN2304213 Y CN 2304213Y CN 97214935 CN97214935 CN 97214935 CN 97214935 U CN97214935 U CN 97214935U CN 2304213 Y CN2304213 Y CN 2304213Y
- Authority
- CN
- China
- Prior art keywords
- electric
- safety protection
- protection switch
- controllable silicon
- bridge rectifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Control Of Resistance Heating (AREA)
Abstract
The utility model relates to a safety protective switch for electric-heating blankets. The utility model firstly utilizes a bridge rectifier circuit to rectify alternating current to direct current which can supply power for the electric-heating blanket after passing through a controlled silicon, and a resistor and a trigger button are orderly connected between the anode and the gate of the controlled silicon. Because of the adoption of the controlled silicon, the electric-heating blanket can be stopped supplying power when the electric-heating blanket occurs poor contact situation, and thereby, the safe performance of the electric-heating blanket is enabled to be improved, avoiding the occurrence of fire phenomena.
Description
The utility model relates to a kind of security appliance protection switch.
Electric blanket in use, the resistance wire phenomenon that usually wrecks, and the face that wrecks connects when disconnected usually the time, form the loose contact of resistance wire, cause the contact resistance of breakpoint bigger, under the situation that continues energising, the breakpoint place produces a large amount of heat, thereby causes the generation of fire easily.Present electric blanket is opened and is only had switch and temperature adjustment function at present, and the loose contact of circuit is not had safeguard measure.
The purpose of this utility model is to provide a kind of and can cuts off the electricity supply automatically when electric blanket comes in contact condition of poor, thus the electric blanket safety protection switch of protection personal safety as well as the property safety.
The technical solution of the utility model is at first being rectified into direct current output with alternating current through bridge rectifier, the high potential end of bridge rectifier links to each other with silicon controlled sun level, be connected with resistance and trigger button between silicon controlled anode and the gate pole in turn, the low electric heating end of silicon controlled negative electrode and bridge rectifier is powered to electric blanket as two outputs of the present utility model.
The utility model in use, controllable silicon is under the effect of forward electromotive force always, when pressing trigger button, controllable silicon will the conducting owing to obtaining a trigger impulse, thereby beginning is powered to electric blanket.Silicon controlled power supply is kept electric current more than 45 milliamperes, when operating current less than 45 MAHs, controllable silicon will be blocked and stop to power to the electric heating felt.The running current of electric blanket is between 220 milliamperes-260 milliamperes; can make the controllable silicon continued power fully; when electric blanket breaks down; when the situation of loose contact is promptly arranged; because its operating current will no longer can maintain more than 45 milliamperes all the time; cause the silicon controlled blocking-up; even at this moment contact is good once more; because controllable silicon does not obtain triggering signal once more can not conducting; no longer power to electric blanket; thereby avoided because the electric blanket local overheating that loose contact causes and the possibility of initiation fire, protected the safety of personal property.
The utility model is described in more detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is external form figure of the present utility model
Fig. 2 is a line map of the present utility model
Wherein 1 is the green emitting diode, is used for the output indication of DC power supply after the rectification, and R1 is a metalfilmresistor, is used for the current limliting of green LED 1.2 is red light emitting diodes, and the work or the fault that are used for electric blanket show.R2 is a metalfilmresistor, is used for the current limliting of red light emitting diodes 2.3 is the trigger button of controllable silicon CR, and R3 is a metalfilmresistor, is used for silicon controlled gate pole current limliting.4 is shell of the present utility model.5 is three third gear switch, and it three is respectively K1, K2, K3, and when K3 was in neutral position, K1 and K2 were in open position, and when K3 was in other two grades, K1 and K2 were in the close position.D1-D4 is a rectifier diode, forms bridge rectifier, and D5 is the current limliting diode, and the selecting for use to make of D5 the utlity model has two grades of temperature of high and low temperature.C is a polarity free capacitor, is connected in parallel between the anode and negative electrode of controllable silicon CR, is used to absorb the non-direct current signal at controllable silicon CR two ends, and BX is a protective tube, and R4 is the conventional letter of electric blanket.During the utility model work, the action of three third gear switch 5 can make it possess pass, high temperature, three kinds of selections of low temperature.When the electric blanket operate as normal, red, green two light-emitting diodes are normally luminous, prove working properly; When fault takes place, controllable silicon will be supplied with the current blocking of electric blanket, this moment, bridge rectifier had normal direct current output, green LED will be normally luminous, and emitting red light secondary utmost point pipe will can not get normal operating voltage, but because the effect of capacitor C, it still can be luminous, but its light intensity have only just often about 1/3rd, this moment illustrate that just electric blanket is in malfunction, need repairing.
Claims (5)
1; a kind of electric blanket safety protection switch; by first diode (D1); second diode (D2); the 3rd diode (D3) and the 4th diode (D4) are formed bridge rectifier; the ac input end of bridge rectifier is 220 volts of traffic electric inputs of described safety protection switch; the high potential output that it is characterized in that bridge rectifier links to each other with the anode of controllable silicon (CR); be connected with the 3rd resistance (R3) and trigger button (3) between the anode of controllable silicon (CR) and the gate pole in turn; the cathode terminal of the low potential end of rectification circuit and controllable silicon (CR) is as two outputs of described safety protection switch.
2, the described safety protection switch of a kind of claim 1 is characterized in that being connected with electric capacity (C) between the anode of controllable silicon (CR) and the negative electrode.
3, a kind of safety protection switch as claimed in claim 1 or 2; it is characterized in that being connected with between the output of silicon controlled negative electrode and described safety protection switch the 3rd (K3) of three third gear switch (5); other two (K1, the K2) of three third gear switch (5) are contained in after the ac input end of described safety protection switch; the third gear one of described the 3rd (K3) is a neutral gear; another negative electrode with controllable silicon (CR) links to each other, and one links to each other with the negative electrode of controllable silicon (CR) by the 5th diode (D5) again.
4, a kind of safety protection switch as claimed in claim 3 is characterized in that being connected with in turn between two outputs of bridge rectifier between two outputs of first light-emitting diode (1) and first resistance (R1), described safety protection switch and is connected with second light-emitting diode (2) and second resistance (R2) in turn.
5, a kind of safety protection switch as claimed in claim 4 is characterized in that an input of bridge rectifier is equipped with protective tube (Bx) before.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97214935 CN2304213Y (en) | 1997-04-18 | 1997-04-18 | Safety protective switch for electric-heating blanket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97214935 CN2304213Y (en) | 1997-04-18 | 1997-04-18 | Safety protective switch for electric-heating blanket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2304213Y true CN2304213Y (en) | 1999-01-13 |
Family
ID=33932233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97214935 Expired - Fee Related CN2304213Y (en) | 1997-04-18 | 1997-04-18 | Safety protective switch for electric-heating blanket |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2304213Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461574C (en) * | 2006-09-13 | 2009-02-11 | 沈阳铝镁设计研究院 | Power-supply rectifying system at direct current side with protection device |
-
1997
- 1997-04-18 CN CN 97214935 patent/CN2304213Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461574C (en) * | 2006-09-13 | 2009-02-11 | 沈阳铝镁设计研究院 | Power-supply rectifying system at direct current side with protection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |