Uninterruptible power system and power conversion circuit thereof

An uninterruptible power system, comprising:

• a power conversion circuit, comprising:
• an inductance;
• a first capacitor, one terminal of which being used as a positive DC bus, and the other terminal being electrically coupled to a neutral wire of an AC input of the uninterruptible power system;
• a second capacitor, one terminal of which being used as a negative DC bus, and the other terminal being electrically coupled to the neutral wire;
• a first switch, having a first terminal, a second terminal and a first control terminal, the first terminal being electrically coupled to one terminal of the inductor;
• a second switch, having a third terminal, a fourth terminal and a second control terminal, the third terminal being electrically coupled to the second terminal, and the fourth terminal being electrically coupled to the neutral wire;
• a third switch, having a fifth terminal, a sixth terminal and a third control terminal, the fifth terminal being electrically coupled to the fourth terminal;
• a first diode, an anode of which being electrically coupled to the first terminal, and a cathode of which being electrically coupled to the positive DC bus;
• a second diode, a cathode of which being electrically coupled to the first terminal, and an anode of which being electrically coupled to the sixth terminal;
• and
• a third diode, a cathode of which being electrically coupled to the sixth terminal, and an anode being electrically coupled to the negative DC bus;
• a fourth switch, having a seventh terminal, an eighth terminal and a ninth terminal, the seventh terminal being electrically coupled to a live wire of the AC input, and the eighth terminal being electrically coupled to a positive electrode of a battery, the ninth terminal being electrically coupled to the other terminal of the inductor;
• and
• a fifth switch, being electrically coupled between a negative electrode of the battery and the cathode of the third diode,
• wherein when the uninterruptible power system is in an online mode, the ninth terminal is electrically coupled to the seventh terminal, and the fifth switch is turned off, and when the uninterruptible power system is in a battery mode, the ninth terminal is the terminal is electrically coupled to the eighth terminal, and the fifth switch is turned on.

A power conversion circuit of an uninterruptible power system, comprising:

• an inductance;
• a first capacitor, one terminal of which being used as a positive DC bus, and the other terminal being electrically coupled to a neutral wire of an AC input of the uninterruptible power system;
• a second capacitor, one terminal of which being used as a negative DC bus, and the other terminal being electrically coupled to the neutral wire;
• a first switch, having a first terminal, a second terminal and a first control terminal, the first terminal being electrically coupled to one terminal of the inductor;
• a second switch, having a third terminal, a fourth terminal and a second control terminal, the third terminal being electrically coupled to the second terminal, and the fourth terminal being electrically coupled to the neutral wire;
• a third switch, having a fifth terminal, a sixth terminal and a third control terminal, the fifth terminal being electrically coupled to the fourth terminal;
• a fourth switch, having a seventh terminal, an eighth terminal and a fourth control terminal, the seventh terminal being electrically coupled to the positive DC bus, and the eighth terminal being electrically coupled to the first terminal;
• a fifth switch, having a ninth terminal, a tenth terminal and a fifth control terminal, the ninth terminal being electrically coupled to the first terminal, and the tenth terminal being electrically coupled to the sixth terminal;
• and
• a diode, a cathode of which being electrically coupled to the sixth terminal, and an anode of which being electrically coupled to the negative DC bus.

An uninterruptible power system, comprising:

• a power conversion circuit, comprising:
• an inductance;
• a first capacitor, one terminal of which being used as a positive DC bus, and the other terminal being electrically coupled to a neutral wire of an AC input of the uninterruptible power system;
• a second capacitor, one terminal of which being used as a negative DC bus, and the other terminal being electrically coupled to the neutral wire;
• a first switch, having a first terminal, a second terminal and a first control terminal, the first terminal being electrically coupled to one terminal of the inductor;
• a second switch, having a third terminal, a fourth terminal and a second control terminal, the third terminal being electrically coupled to the second terminal, and the fourth terminal being electrically coupled to the neutral wire;
• a third switch, having a fifth terminal, a sixth terminal and a third control terminal, the fifth terminal being electrically coupled to the fourth terminal;
• a fourth switch, having a seventh terminal, an eighth terminal and a fourth control terminal, the seventh terminal being electrically coupled to the positive DC bus, and the eighth terminal being electrically coupled to the first terminal;
• a fifth switch, having a ninth terminal, a tenth terminal and a fifth control terminal, the ninth terminal being electrically coupled to the first terminal, and the tenth terminal being electrically coupled to the sixth terminal;
• and
• a diode, a cathode of which being electrically coupled to the sixth terminal, and an anode of which being electrically coupled to the negative DC bus;
• a sixth switch, having an eleventh terminal, a twelfth terminal and a thirteenth terminal, the eleventh terminal being electrically coupled to a live wire of the AC input, and the twelfth terminal being electrically coupled to a positive electrode of the battery, the thirteenth terminal being electrically coupled to the other terminal of the inductor;
• and
• a seventh switch, being electrically coupled between a negative electrode of the battery and the cathode of the diode,
• wherein when the uninterruptible power system is in an online mode, the thirteenth terminal is electrically coupled to the eleventh terminal, and the seventh switch is turned off, and when the uninterruptible power system is in a battery mode, the thirteenth terminal is electrically coupled to the twelfth terminal, and the seventh switch is turned on.