On-board charger

An on-board charger, comprising:

• a power supply terminal comprising a first node, a second node, a third node, and a neutral node;
• a switching circuit, wherein a first end of the switching circuit is electrically connected to the first node, a second end of the switching circuit is electrically connected to the second node, and a third end of the switching circuit is electrically connected to the third node;
• a first bridge arm, wherein a first end of the first bridge arm is electrically connected to a positive voltage bus, a second end of the first bridge arm is electrically connected to a negative voltage bus, and a third end of the first bridge arm is electrically connected to a fourth end of the switching circuit;
• a second bridge arm, wherein a first end of the second bridge arm is electrically connected to the positive voltage bus, a second end of the second bridge arm is electrically connected to the negative voltage bus, and a third end of the second bridge arm is electrically connected to a fifth end of the switching circuit;
• a third bridge arm, wherein a first end of the third bridge arm is electrically connected to the positive voltage bus, a second end of the third bridge arm is electrically connected to the negative voltage bus, and a third end of the third bridge arm is electrically connected to a sixth end of the switching circuit;
• a fourth bridge arm, wherein a first end of the fourth bridge arm is electrically connected to the positive voltage bus, a second end of the fourth bridge arm is electrically connected to the negative voltage bus, and a third end of the fourth bridge arm is electrically connected to the neutral node;
• a first bus capacitor, wherein a first end of the first bus capacitor is electrically connected to the positive voltage bus;
• a second bus capacitor, wherein a first end of the second bus capacitor is electrically connected to a second end of the first bus capacitor, and a second end of the second bus capacitor is electrically connected to the negative voltage bus;
• a first switch, wherein a first end of the first switch is electrically connected to the third end of the fourth bridge arm, and a second end of the first switch is electrically connected to the second end of the first bus capacitor and the first end of the second bus capacitor;
• and
• a control circuit configured to control the switching circuit, the first bridge arm, the second bridge arm, the third bridge arm and the first switch to operate;
• wherein the switching circuit comprises:
• a second switch, wherein a first end of the second switch is electrically connected to the first node, and a second end of the second switch is electrically connected to the third end of the first bridge arm through a first inductor;
• a third switch, wherein a first end of the third switch is electrically connected to the second node, and a second end of the third switch is electrically connected to the third end of the second bridge arm through a second inductor;
• a fourth switch, wherein a first end of the fourth switch is electrically connected to the third node, and a second end of the fourth switch is electrically connected to the third end of the third bridge arm through a third inductor;
• and
• a fifth switch, wherein a first end of the fifth switch is electrically connected to the first node, and a second end of the fifth switch is electrically connected to the second end of the third switch;
• wherein when a single-phase power supply is electrically connected to the power supply terminal, the control circuit controls the second switch and the fifth switch to turn on, and controls the third switch and the fourth switch to turn off, and the control circuit controls the first switch to turn off;
• and
• when a three-phase power supply is electrically connected to the power supply terminal, the control circuit controls the second switch, the third switch and the fourth switch to turn on, and controls the fifth switch to turn off, and the control circuit controls the first switch to turn on.