| 摘要 |
The temperature of a Peltier element is regulated by two control loops. In the ranges where only heating or only cooling are intended to be carried out, the regulation is provided via a voltage converter. In the critical operating range which covers the transition between heating and cooling, a low operating voltage is converted to a drive AC voltage with the aid of a polarity reversal switch and both heating and cooling are carried out, depending on the polarity. The temperature is then regulated by varying the duty ratio.
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