Most of audio players on the market use the hardware filter oAbstract. A multifunctional portable temperature control box based on semiconductor refrigeration technology is designed in order to meet the low and constant temperature requirements of space, military, medical, biological products and so on. This system takes the single chip microcomputer as the control core, uses the semiconductor refrigeration technology, designed the simple, the reliable hardware driving circuit according to the

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... emiconductor TEC device refrigeration principle and the working method unifying the high power MOS tube and the double group of relays, realizes working mode switching and power regulation utilizing the PID and the lag system compensation software control algorithm to control the polarity and switch control of semiconductor TEC devices. The system realizes the -5°C ~ 60°C constant temperature control, and the control precision is high, and it has the characteristics of small size, low cost and clean environment.