This invention provides a DC power input
reverse connection compatible circuit, a power supply circuit, and a household appliance. The DC power input
reverse connection compatible circuit includes a first
diode, a second
diode, a third
diode, and a
control switch. The
anode of the first diode is electrically connected to the positive input terminal, and the
cathode of the first diode is electrically connected to the positive output terminal. The
cathode of the second diode is electrically connected to the positive output terminal, and the
anode of the second diode is electrically connected to the negative output terminal. The
anode of the third diode is electrically connected to the negative output terminal, and the
cathode of the third diode is electrically connected to the negative input terminal. The first terminal of the
control switch is electrically connected to the negative input terminal, and the second terminal of the
control switch is electrically connected to the positive output terminal. A
reverse connection detection circuit is used to acquire the reverse connection
signal between the positive and negative input terminals, and controls the control switch to turn on or off based on the reverse connection
signal. This invention is compatible with both forward and reverse DC power connections and improves circuit safety during reverse connections.