Title:
SOFT TURN-OFF ACTIVE CLAMP PROTECTION CIRCUIT AND POWER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/048293
Kind Code:
A1
Abstract:
The present invention provides a soft turn-off active clamp protection circuit and a power system. The circuit comprises: a gate connection terminal, a drain connection terminal, a source connection terminal, a discharge capacitor, an overvoltage signal acquisition module, a negative feedback module, a discharge current control module, and a turn-off control module. The beneficial effects are that: the overvoltage signal acquisition module, the negative feedback module, the discharge current control module, and the turn-off control module constitute a closed-loop negative feedback regulation system to achieve an effect of limiting the drain-source voltage of a MOSFET to a set voltage value, thereby regulating and controlling a turn-off speed of the MOSFET to achieve self-absorption of voltage clamping and transient energy, and replacing a TVS diode to absorb voltage spikes and energy at a turn-off instant, such that no high temperature is produced, and no heat-dissipating structure to deal with high temperature is required. Thus, the problem in the prior art that a clamp TVS diode is used to absorb voltage spikes and energy at a turn-off instant, resulting in a high failure rate and a large occupied area is solved.
Inventors:
CHEN BINBIN (CN)
CHEN XIAODONG (CN)
CHEN XIAODONG (CN)
Application Number:
PCT/CN2021/104011
Publication Date:
March 10, 2022
Filing Date:
July 01, 2021
Export Citation:
Assignee:
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD (CN)
International Classes:
H02M1/32; H03K17/082
Foreign References:
| CN212413046U | 2021-01-26 | |||
| CN112019010A | 2020-12-01 | |||
| CN206077778U | 2017-04-05 | |||
| CN200976577Y | 2007-11-14 | |||
| CN210724728U | 2020-06-09 | |||
| US20190149144A1 | 2019-05-16 | |||
| EP2978129B1 | 2019-08-14 |
Other References:
See also references of EP 4191856A4
Attorney, Agent or Firm:
JIAQUAN IP LAW (CN)
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