Energy management system including a power supply circuit without a charging loop

A power supply circuit without a charging loop, comprising:

• a direct-current bus capacitor electrically connected between a positive electrode and a negative electrode of a direct-current bus;
• an alternating current switch component configured to electrically connect a live wire of a three-phase alternating current to direct-current bus, and cause, when alternating current is selected to charge direct-current bus capacitor, a voltage across two ends of the direct-current bus capacitor to steadily rise to a target voltage;
• a photovoltaic switching component configured to electrically connect a photovoltaic power supply to the direct-current bus, and cause, when the photovoltaic power supply is selected to charge the direct-current bus capacitor, the voltage across the two ends of the direct-current bus capacitor to steadily rise to the target voltage, wherein, a first live wire of the three-phase alternating current is electrically connected to a positive electrode of the direct-current bus through a first switch in the alternating current switch component, and is electrically connected to a negative electrode of the direct-current bus through a second switch in the alternating current switch component;
• a second live wire of the three-phase alternating current is electrically connected to the positive electrode of the direct-current bus through a third switch in the alternating current switch component, and is electrically connected to the negative electrode of the direct-current bus through a fourth switch in the alternating current switch component;
• a third live wire of the three-phase alternating current is electrically connected to the positive electrode of the direct-current bus through a fifth switch in the alternating current switch component, and is electrically connected to the negative electrode of the direct-current bus through a sixth switch in the alternating current switch component;
• and a seventh switch in the alternating current switch component is in inverse parallel connection to the first switch, an eighth switch is in inverse parallel connection to the third switch, a ninth switch is in inverse parallel connection to the fifth switch, a tenth switch is in inverse parallel connection to the second switch, an eleventh switch is in inverse parallel connection to the fourth switch, and a twelfth switch is in inverse parallel connection to the sixth switch.