Electric blanket with digital temperature sensors

摘要

An electric blanket includes a substrate made of cotton cloth, a heating member mounted on the substrate, a plurality of digital temperature sensors mounted to the heating member at a plurality of positions for detecting temperature of the heating member at the positions and sending signals relating to the temperature of the heating member at the positions and indicating the positions, a temperature protection switch, an electromagnetic radiation interference filter electrically connected to an AC power source, a DC power supply circuit, a display for displaying at least temperature of the electric blanket, a zero-cross detector, a triac electrically connected to the heating member, and a central processing unit. The central processing unit receives and processes the signals from the digital temperature sensors and a feedback signal from the temperature protection switch to control temperature of the electric blanket.