Patent ID: 11949282
Assignee: LIAN ZHENG ELECTRONICS (SHENZHEN) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. The offline uninterruptible power source of claim 7, wherein
when the mains voltage is greater than or equal to a first threshold voltage and less than a second threshold voltage, the control circuit turns the safety switch on, connects the third switch to the first switch, connects the first switch to the tap of the primary side of the transformer, connects the second switch to the second terminals of the primary side of the transformer, and turns the output switch on; wherein when the rechargeable battery is not fully charged, the control circuit deactivates the charger and controls the bidirectional converter to convert alternating current of the secondary side of the transformer into direct current; and wherein when the rechargeable battery is fully charged, the control circuit deactivates the bidirectional converter and controls the charger to convert alternating current of the alternating-current input into direct current;
when the mains voltage is higher than or equal to the second threshold voltage and is lower than a third threshold voltage, the control circuit turns the safety switch on; wherein when the rechargeable battery is not fully charged, the control circuit connects the third switch to the first switch, connects the first switch and the second switch to the second terminal of the primary side of the transformer, turns the output switch on, and controls the bidirectional converter to convert alternating current of the secondary side of the transformer into direct current; and when the rechargeable battery is fully charged, the control circuit connects the third switch to the second terminal of the alternating-current output, turns the output switch off, deactivates the bidirectional converter, and controls the charger to convert alternating current of the alternating-current input into direct current;
when the mains voltage is higher than or equal to the third threshold voltage and is lower than a fourth threshold voltage, the control circuit turns the safety switch on, connects the third switch to the first switch, connects the first switch to the second terminal of the primary side of the transformer, connects the second switch to the tap of the primary side of the transformer, and turns the output switch on; wherein when the rechargeable battery is not fully charged, the control circuit deactivates the charger and controls the bidirectional converter to convert alternating current of the secondary side of the transformer into direct current; and when the rechargeable battery is fully charged, the control circuit deactivates the bidirectional converter and controls the charger to convert alternating current of the alternating-current input into direct current;
or, when the first threshold voltage is higher than the mains voltage or is higher than or equal to the fourth threshold voltage, the control circuit turns the safety switch off, connects the second switch to the second terminal of the primary side of the transformer, turns the output switch on, and controls the bidirectional converter to convert direct current of the rechargeable battery into alternating current.