Title:
FLYING CAPACITOR THREE-LEVEL DC-DC CONVERTER, PHOTOVOLTAIC SYSTEM AND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2024/037058
Kind Code:
A1
Abstract:
Disclosed in the present application are a flying capacitor three-level DC-DC converter, a photovoltaic system and a control method. The flying capacitor three-level DC-DC converter comprises: an inductor, a first switch tube, a second switch tube, a first diode, a second diode, a third diode, a flying capacitor and a controller. When the difference between the voltage of a direct-current bus and the voltage of the flying capacitor is greater than or equal to the withstand voltage of the second diode, the controller controls the DC-DC converter not to operate, so as to reduce the voltage of the direct-current bus. When the voltage of the direct-current bus is extra high or a pre-charge voltage of the flying capacitor is extra low, the DC-DC converter operates, and thus the second diode bears an extra-high voltage and is easily damaged. Therefore, by means of reducing the voltage of the direct-current bus, the voltage of the flying capacitor Cf is synchronously raised by means of charging until the difference between the voltage of the direct-current bus and the voltage of the flying capacitor is less than the withstand voltage of the second diode, and then the DC-DC converter operates, such that the safety of the second diode can be ensured.
Inventors:
WANG CHANGYOU (CN)
CHEN CHANGCHUN (CN)
CHEN CHANGCHUN (CN)
Application Number:
PCT/CN2023/092676
Publication Date:
February 22, 2024
Filing Date:
May 08, 2023
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
H02J3/38; H02M3/158; H02M1/088; H02M1/32
Domestic Patent References:
| WO2018045936A1 | 2018-03-15 |
Foreign References:
| CN115242092A | 2022-10-25 | |||
| CN112701913A | 2021-04-23 | |||
| CN216216527U | 2022-04-05 | |||
| CN106505527A | 2017-03-15 | |||
| CN107070215A | 2017-08-18 | |||
| CN112564483A | 2021-03-26 | |||
| CN211656005U | 2020-10-09 | |||
| CN213937746U | 2021-08-10 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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