Title:
GATE DRIVE CIRCUIT FOR LOWERING REVERSE RECOVERY CURRENT OF POWER DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/228468
Kind Code:
A1
Abstract:
A gate drive circuit that lowers reverse recovery current of a power device, which belongs to the technical field of basic electronic circuits. The gate drive circuit comprises a high-voltage LDMOS (M3), a diode (D2) that forms a freewheeling path when turned on or a low-voltage MOS (M4) in antiparallel connection with a body diode, and a voltage detection circuit, wherein when the power device is turned off, an inductive load generates a freewheeling current that flows through the diode (D2), the voltage detection circuit detects that the diode (D2) is turned on, and an output signal is processed by a control circuit and then enables the drive circuit to output a high level, thereby causing channels of the power device and the high-voltage LDMOS (M3) to be turned on. As a result, the freewheeling current flows through from conducting channels and almost does not flow through the freewheeling diode. At said time, the freewheeling diode almost does not have reverse recovery current, thereby achieving the goal of lowering the reverse recovery current of the power device.
Inventors:
SUN WEIFENG (CN)
ZHU JING (CN)
YANG BOWEI (CN)
YU SIYUAN (CN)
LU YANGYANG (CN)
SHI LONGXING (CN)
ZHU JING (CN)
YANG BOWEI (CN)
YU SIYUAN (CN)
LU YANGYANG (CN)
SHI LONGXING (CN)
Application Number:
PCT/CN2020/084856
Publication Date:
November 19, 2020
Filing Date:
April 15, 2020
Export Citation:
Assignee:
UNIV SOUTHEAST (CN)
International Classes:
H03K17/081; H03K17/687
Foreign References:
| CN110138367A | 2019-08-16 | |||
| US10090751B1 | 2018-10-02 | |||
| CN107493095A | 2017-12-19 | |||
| CN101425746A | 2009-05-06 | |||
| CN102904220A | 2013-01-30 |
Other References:
SIYUAN YU ET AL.: "Gate Control Circuit for the LIGBT to Improve the Freewheeling Characteristics in Monolithic IC", PROCEEDINGS OF THE 31ST INTERNATIONAL SYMPOSIUM ON POWER SEMICONDUCTOR DEVICES & ICS, 23 May 2019 (2019-05-23), XP033574571, DOI: 20200629163025PX
Attorney, Agent or Firm:
NANJING JINGWEI PATENT & TRADEMARK AGENCY CO., LTD (CN)
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