Battery simulation circuit

A battery simulation circuit, comprising:

• an input/output terminal electrically connected to an electronic device;
• an integrated amplifier comprising a non-inverting input pin, an inverting pin, an input/output pin, and a current limitation pin;
• a voltage adjustment unit electrically connected to the non-inverting input pin to provide a reference voltage to the integrated amplifier;
• a current limitation unit electrically connected to the current limitation pin to provide a reference current to the integrated amplifier;
• a feedback unit electrically connected to the input/output pin, the inverting pin, and the input/output terminal to provide a negative feedback signal for the integrated amplifier;
• and
• wherein the integrated amplifier outputs an output signal according to the reference voltage and the reference current;
• the battery simulation circuit supplies power for the electronic device;
• when the output terminal is connected to a DC power source and a voltage of the DC power source is greater than the output voltage of the output terminal, the battery simulation circuit simulates a battery being recharged by the DC power source via the output terminal.