Title:
BUCK-BOOST CONVERTER AND POWER SUPPLY SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/077931
Kind Code:
A1
Abstract:
The present application discloses a buck-boost converter and a power supply system. The converter comprises a controller, a controllable switching transistor, a freewheeling diode and a boost circuit. A first terminal and a second terminal of the controllable switching transistor are respectively connected to the positive input terminal of the buck-boost converter and the positive input terminal of the boost circuit. The anode and the cathode of the freewheeling diode are respectively connected to the negative input terminal of the buck-boost converter and the second terminal of the controllable switching transistor. The controller is used for controlling the buck-boost converter to work in a buck mode when the input voltage of the buck-boost converter is greater than a preset voltage, and controlling the buck-boost converter to work in a boost mode when the input voltage of the buck-boost converter is smaller than the preset voltage. Due to the existence of the freewheeling diode in the boost circuit, when the direct-current input terminal is short-circuited, the freewheeling diode in the boost circuit bears reverse voltage blocking, so as to avoid short circuiting of the output terminal of the buck-boost converter, thereby protecting the buck-boost converter.
Inventors:
HU FANYU (CN)
CAO JINHU (CN)
CAO JINHU (CN)
Application Number:
PCT/CN2023/091135
Publication Date:
April 18, 2024
Filing Date:
April 27, 2023
Export Citation:
Assignee:
SUNGROW POWER SUPPLY CO LTD (CN)
International Classes:
H02M3/155; H02J7/35; H02M1/00; H02M1/088; H02M7/44
Foreign References:
| CN115514220A | 2022-12-23 | |||
| CN110249518A | 2019-09-17 | |||
| CN111245220A | 2020-06-05 | |||
| JP2017051001A | 2017-03-09 |
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW CO., LTD. (CN)
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