Voltage regulating circuit

An uninterruptible power supply system, comprising:

• an input end, connected to a utility power, comprising an input load line and an input neutral line;
• a protecting switch, comprising a first terminal, a second terminal, a third terminal and a fourth terminal, wherein the first terminal of the protecting switch is connected to the input load line, and the third terminal of the protecting switch is connected to the input neutral line;
• a first switch, comprising a first terminal, a second terminal and a third terminal, wherein the first terminal of the first switch is connected to the second terminal of the protecting switch;
• a second switch, comprising a first terminal, a second terminal and a third terminal, wherein the second terminal of the second switch is connected to the second terminal of the first switch, and the third terminal of the second switch is connected to the third terminal of the first switch;
• a third switch, comprising a first terminal and a second terminal, wherein the second terminal of the third switch is connected to the third terminal of the first switch;
• a transformer, comprising:
• a first coil, having one end connected to the second terminal of the first switch and having the other end connected to the third terminal of the first switch;
• a second coil, having one end connected to the first terminal of the third switch and having the other end connected to the fourth terminal of the protecting switch;
• and
• a third coil, configured side by side with respect to the second coil;
• a charger, connected to the input end of the uninterruptible power supply system;
• a battery pack, connected to the charger;
• a bridge inverter, having an input and an output, the input of the bridge inverter connected to the battery pack, the output of the bridge inverter connected to the third coil;
• and
• an output end, comprising an output load line and an output neutral line, wherein the output load line is connected to the first terminal of the second switch and the output neutral line is connected to the fourth terminal of the protecting switch;
• wherein the charger charges the battery pack when the utility power is working normally, the battery pack provides power to the output end via the bridge inverter when the utility power does not work, and a controller in the uninterruptible power supply system controls the turning on and off of the first switch, the second switch and the third switch such that the transformer provides various voltage adjustments in different modes.

A voltage regulating circuit, used in an uninterruptible power supply system, comprising:

• an input end, connected to a utility power, comprising an input load line and an input neutral line;
• a protecting switch, comprising a first terminal, a second terminal, a third terminal and a fourth terminal, wherein the first terminal of the protecting switch is connected to the input load line and the third terminal of the protecting switch is connected to the input neutral line;
• a first switch, comprising a first terminal, a second terminal and a third terminal, wherein the first terminal of the first switch is connected to the second terminal of the protecting switch;
• a second switch, comprising a first terminal, a second terminal and a third terminal, wherein the second terminal of the second switch is connected to the second terminal of the first switch;
• a third switch, comprising a first terminal and a second terminal, wherein the second terminal of the third switch is connected to the third terminal of the first switch;
• a first coil, having one end connected to the second terminal of the first switch and having the other end connected to the third terminal of the second switch;
• a second coil, having one end connected to the third terminal of the second switch and having the other end connected to the third terminal of the first switch;
• a third coil, having one end connected to the first terminal of the third switch and having the other end connected to the fourth terminal of the protecting switch;
• and
• an output end, comprising an output load line and an output neutral line;
• wherein the fourth terminal of the protecting switch is connected to the output neutral line and the first terminal of the second switch is connected to the output load line.