POWER SUPPLY CIRCUIT OF TERMINAL DEVICE, TERMINAL DEVICE AND POWER SUPPLY METHOD

A power supply circuit of a terminal device is provided. The power supply circuit includes a voltage boost circuit, a battery chip, and a controller. The battery chip is configured to provide an output voltage of a battery for a load. An input end of the voltage boost circuit is connected to a positive electrode of the battery, and an output end of the voltage boost circuit is connected to the load. The voltage boost circuit is configured to boost an input voltage and then output a boosted voltage. The controller is configured to: when a sampling temperature is less than a preset temperature value and/or the output voltage of the battery is less than a first preset voltage value, control the voltage boost circuit to work and control the battery chip to stop supplying power to the load; and when an output voltage of the voltage boost circuit is less than an input voltage of the voltage boost circuit, control the battery chip and the voltage boost circuit to simultaneously supply power to the load. In this solution, the output voltage of the battery may be boosted when the temperature is relatively low and/or the output voltage of the battery is relatively low. In addition, when a relatively high pulse current occurs on the terminal and the output voltage of the voltage boost circuit is stepped down, both the battery chip and the voltage boost circuit can be controlled to supply power to the load, to boost a power supply current.