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1. A heat utilizing circuit, configured to convert heat radiated by an electronic device to electrical power to power a function module of the electronic device, the heat utilizing circuit comprising:
a heat conversion unit, configured to convert the heat to electrical power; a pulse width modulation (PWM) signal producing unit comprising a first port and a second port, wherein, the first port is electrically connected to the heat conversion unit and the second port is to be electrically connected to the function module, the PWM signal producing unit is configured to convert the electrical power produced by the heat conversion unit to a PWM voltage signal and to power the function module by using the PWM voltage signal, wherein, a voltage of the first port is an input voltage of the function module; a comparison unit connected to the first port of the PWM signal producing unit, configured to obtain the input voltage and compare the input voltage with a reference voltage, and produce a first trigger signal when comparing the input voltage is grater than the reference voltage, and produce a second trigger signal when comparing the input voltage is less than the reference voltage; and a control unit connected between the comparison unit and the PWM signal producing unit, and configured to increase a duty cycle of the PWM voltage signal produced by the PWM signal producing unit when receiving the first trigger signal, and to decrease the duty cycle of the PWM voltage signal produced by the PWM signal when receiving the second trigger signal.
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