Temperature control device of electric warming pad

Abstract

The invention relates to a temperature control device of an electric warming pad, and belongs to the technical field of electric warming control. The device comprises a power supply for supplying power to heating wires in the electric warming pad, wherein a first electronic switch and a second electronic switch are arranged between the power supply and the heating wires; an and gate is formed between the first electronic switch and the second electronic switch; the device does not comprise a first temperature sensor for measuring and controlling the real-time temperature of the electric warming pad, a first temperature control processor and a temperature fuse. The device further comprises a second temperature control processor which is used for outputting a pulse signal of which the valueis less than 100% of duty ratio in order to control the first electronic switch and the second electronic switch to be alternatively connected and disconnected; the heating wires are used for performing pulse power supplying on the basis of the duty ratio. With the adoption of the device, the double-safety control mechanism including constant temperature control and temperature fuse power-off protection of a conventional electric warming pad is completely removed; the safety of the electric warming pad in use is ensured; and the structure of the electric warming pad is greatly simplified.

Description

technical field [0001] The invention relates to a temperature control device for an electric heating blanket or an electric heating pad, belonging to the technical field of electric heating control. Background technique [0002] Pads or blankets for electric heating or physiotherapy are widely used in people's daily life. This kind of electric heating sleeping pad is generally a constant temperature control type, and the control constant temperature value is set between 25°C and 50°C. In this temperature range, the temperature sensor installed in the pad or blanket is used to sample the heating temperature in real time, and the sampled value is compared with the set temperature value to realize automatic temperature adjustment, so as to achieve the purpose of constant temperature. This temperature control is the mode commonly used at present, and a point sampling NTC temperature sensor and a disposable temperature-limiting temperature fuse are generally installed in the pad...

AI Technical Summary

Problems solved by technology

However, a one-time thermal fuse can only collect the temperature of one point and cannot reflect the temperature of the entire mat, so the reliability is greatly reduced. If many disposable thermal fuses are installed in the mat, the reliability will of course be improved, but the production cost The height and the internal wiring become complicated, and it is difficult to realize in the process

Electric blankets or pads are bound to cause misfires when NTC temperature sensors and / or one-time thermal fuses fail or are not set

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