Manual temperature adjustment electrothermal seat cushion

Abstract

The invention discloses a manual temperature adjustment electrothermal seat cushion which is characterized by comprising a 220V alternating-current power supply, a full-bridge rectifying circuit, a 12V voltage stabilizing circuit, a temperature adjustment control signal and signal amplification circuit, a bidirectional controllable silicon triggering circuit and a bidirectional controllable silicon control circuit, wherein the temperature adjustment control signal and signal amplification circuit consists of a PNP-type transistor VT1, a resistor R2, a resistor R3, a resistor R4 and a linear potentiometer RP; the bidirectional controllable silicon triggering circuit consists of a unijunction transistor VT2, a capacitor C1 and a resistor R5; the model of the unijunction transistor VT2 is BT33; according to the bidirectional controllable silicon control circuit, a second positive electrode T2 of bidirectional controllable silicon BCR is connected with a positive electrode output end of the full-bridge rectifying circuit through electrothermal cloth SGC; a control electrode G of the bidirectional controllable silicon BCR is connected with a first base B1 of the unijunction transistor VT2; a first positive electrode T1 of the bidirectional controllable silicon BCR is connected with a negative electrode output end of the full-bridge rectifying circuit.

Description

technical field [0001] The invention belongs to the field of electronic technology application and lighting technology, and relates to a manual temperature-regulating electric heating seat cushion. Background technique [0002] All kinds of electric heating seat cushions in the market mostly use electric heating wires as heating materials. They have the following problems: first, there is a low-frequency alternating magnetic field in the inductive load, especially for children or pregnant women who use it for a long time, which is harmful to physical and mental health; second, the softness of the electric heating wire is insufficient. The heating wire is easy to leak or catch fire due to folding and breaking after long-term sitting pressure and kneading; the third is that the heating wire is suddenly powered on at night in winter when the resistance of the cold state is small, and the heating wire is easy to burn out. Difficult to discover in time, there is certain potential...

AI Technical Summary

Problems solved by technology

[0002] All kinds of electric heating seat cushions in the market mostly use electric heating wires as heating materials. They have the following problems: first, there is a low-frequency alternating magnetic field in the inductive load, especially for children or pregnant women who use it for a long time, which is harmful to physical and mental health; second, the softness of the electric heating wire is insufficient. The heating wire is easy to leak or catch fire due to folding and breaking after long-term sitting pressure and kneading; the third is that the heating wire is suddenly powered on at night in winter when the resistance of the cold state is small, and the heating wire is easy to burn out. It is difficult to find out in time, and there are certain safety hazards; fourth, there are safety problems when you forget to turn off the power occasionally and heat for a long time

Images