CN201194691Y

CN201194691Y - Constant-direct current temperature control electric blanket

Info

Publication number: CN201194691Y
Application number: CNU2008200131120U
Authority: CN
Inventors: 张立民
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-23
Filing date: 2008-05-23
Publication date: 2009-02-18
Anticipated expiration: 2018-05-23

Abstract

The utility model provides an electric blanket with steady DC controlled-temperature, which makes improvement on the circuits of the electric blanket and eliminates the electromagnetic-field radiation. The electric blanket is characterized in that the output end of a bridge rectifier and filter circuit is connected with the input end of a temperature-controlling switch circuit, the point b and the point c of the temperature-controlling switch circuit are connected with an electric heating wire RL2, the point a and the point c of the temperature-controlling switch circuit are connected with an electric heating wire RL1; the temperature-controlling switch circuit adopts a double-pole double throw switch, the output end of the bridge rectifier and filter circuit is connected with the K1 and the K2 of the temperature-controlling switch circuit, wherein, the electric heating wires RL2 and RL1 are connected in series among the point a, a point d, and a point e, wherein, the point c is connected with the joint point of the electric heating wires RL1 and RL2; the input end of the bridge rectifier and filter circuit is connected with the output end of a controlled silicon AC voltage-regulating circuit, and the output end of the bridge rectifier and filter circuit is concatenated with an electric heating wire RL5. The utility model can eliminate the harm from the electromagnetic field and can adjust the temperature.

Description

Steady direct current temperature control electric blanket

Technical field: the invention is the improvement to the electric blanket circuit structure.

Background technology: at present, electric blanket commonly used is heating wire to be powered by the temperature control switch by the 220V alternating current, make the electrothermal wire heating, the temperature control switch has height two retainings, is directly heated by alternating current when high gear, during low gear, become the pulse direct current power supply, no matter be to exchange, or pulse direct current, always the size of current cyclically-varying in the circuit, the magnetic field that the electric current that changes changes, the electric field that the magnetic field that changes can change again, the electric field and the magnetic field that around heating wire, alternately occur, with the form of ripple to ambient radiation, radiation intensity is approximately 100mg, Sweden's Northern Europe investigation in 1993 is announced, is subjected to the above electromagnetic radiation of 2mg, and is harmful to health; Electric blanket is except electromagnetic radiation, the waveform electric current that heating wire produces produces induced-current in user's body, these electric currents heat or electrolysis human cell tissue by the electrolyte in human body cell liquid or the body fluid, the user can feel that drying gets angry, can disturb normal biological electricity order in the human body simultaneously, the normal phase uses central nervous system, immunologic function, blood circulation system, reproductive system, vision is harmful, and particularly the harm to old man, child and pregnant woman is bigger.

Summary of the invention: the purpose of the invention provides and a kind of civil power is become direct current, heats heating wire with direct current, and direct current only produces stable magnetic field in heating wire, and the person is not produced harm and can realize the steady direct current temperature control electric blanket of temperature control; The purpose of the invention is to realize by following technical scheme: steady direct current temperature control electric blanket, form by bridge rectifier filter circuit, temperature control on-off circuit, heating wire; The bridge rectifier filter circuit output connects the input of temperature control on-off circuit, connects heating wire RL2 between output b, the c point of temperature control on-off circuit, connects heating wire RL1 between a, the c point.

Steady direct current temperature control electric blanket, the temperature control on-off circuit adopts the two passes of casting aside of double-pole, the bridge rectifier filter circuit output connects K switch 1, the K2 of temperature control on-off circuit, be connected in series heating wire RL2, RL1 between the output a point of temperature control on-off circuit and d point and the e point, the output c point of temperature control on-off circuit links to each other with heating wire RL1, RL2 tie point.

Steady direct current temperature control electric blanket, bridge rectifier filter circuit input connect SCR AC regulating circuit output, bridge rectifier filter circuit output serial connection heating wire RL.

The advantage of the invention: owing to adopted current rectifying and wave filtering circuit, make alternating current become the dc source of steady, direct current only produces stable magnetic field and does not generate electromagnetic waves in heating wire, can not induce induced current, is safe to human body therefore; Owing to adopted the temperature control on-off circuit, can realize temperature control, adopt preposition SCR AC regulating circuit, the adjustment by adjustable resistance W1 can realize stepless temperature control.

Description of drawings:

Fig. 1 is steady direct current temperature control electric blanket circuit theory diagrams;

Fig. 2 is that steady direct current temperature control electric blanket adopts the two pass circuit theory diagrams of casting aside of double-pole;

Fig. 3 is that steady direct current temperature control electric blanket connects SCR AC regulating circuit structure principle chart at the current rectifying and wave filtering circuit input.

The specific embodiment: steady direct current temperature control electric blanket is characterized in that being made up of bridge rectifier filter circuit, temperature control on-off circuit, heating wire; The bridge rectifier filter circuit output connects the input of temperature control on-off circuit, connects heating wire RL2 between output b, the c point of temperature control on-off circuit, connects heating wire RL1 between a, the c point.Heating wire RL1, RL2 can adopt two-wire to lay side by side, and two heating wire are separated by 2 to 3 centimetres, during the low temperature retaining, when the K in the temperature control on-off circuit connects a, two-wire heating wire RL1, RL2 series connection, resistance increases, electric current reduces, when high temperature keeps off, when K connects b, have only heating wire RL2 to have electric current to pass through, the heating wire length of energising reduces half, resistance reduces, and electric current increases, and is illustrated in figure 1 as scheme one;

Steady direct current temperature control electric blanket is that the temperature control on-off circuit adopts the two passes of casting aside of double-pole, the bridge rectifier filter circuit output connects two pass K1, the K2 of casting aside of double-pole of temperature control on-off circuit, be connected in series heating wire RL2, RL1 between the output a point of temperature control on-off circuit and d point and the e point, the output c point of temperature control on-off circuit links to each other with heating wire RL1, RL2 tie point.Heating wire RL1, RL2 adopt monofilament to lay, and when being in the low temperature retaining, K1 connects the b point in the switch, K2 connects the d point simultaneously, heating wire RL1, RL2 energising, and resistance is bigger, heating wire low temperature, when K1 connects a point, K2 connects the c point, heating wire RL1, RL2 parallel connection simultaneously, resistance reduces half in the circuit, electric current doubles, and be illustrated in figure 2 as scheme two for the high temperature retaining this moment.

Steady direct current temperature control electric blanket connects SCR AC regulating circuit output at the bridge rectifier filter circuit input, bridge rectifier filter circuit output serial connection heating wire RL, be illustrated in figure 3 as scheme three, the control section of the steady direct current temperature control electric blanket shown in this circuit, the control section of the alternative common electric blanket of using always on the market at present is as long as change the electric blanket realization steady direct current temperature control electric blanket that former control section just can make present AC-powered.

Claims

1. steady direct current temperature control electric blanket is characterized in that being made up of bridge rectifier filter circuit, temperature control on-off circuit, heating wire; The bridge rectifier filter circuit output connects the input of temperature control on-off circuit, connects heating wire RL2 between output b, the c point of temperature control on-off circuit, connects heating wire RL1 between a, the c point.

2. steady direct current temperature control electric blanket according to claim 1, it is characterized in that the temperature control on-off circuit adopts the two passes of casting aside of double-pole, the bridge rectifier filter circuit output connects K switch 1, the K2 of temperature control on-off circuit, be connected in series heating wire RL2, RL1 between the output a point of temperature control on-off circuit and d point and the e point, the output c point of temperature control on-off circuit links to each other with heating wire RL1, RL2 tie point.

3. steady direct current temperature control electric blanket according to claim 1 is characterized in that connecting SCR AC regulating circuit output at the bridge rectifier filter circuit input, bridge rectifier filter circuit output serial connection heating wire RL.