- 专利标题: Gate driver for switching converter having body diode power loss minimization
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申请号: US16149745申请日: 2018-10-02
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公开(公告)号: US10439483B2公开(公告)日: 2019-10-08
- 发明人: Anatoliy V. Tsyrganovich , Leonid A. Neyman , Md Abdus Sattar , Vladimir Tsukanov
- 申请人: Littelfuse, Inc.
- 申请人地址: US IL Chicago
- 专利权人: Littelfuse, Inc.
- 当前专利权人: Littelfuse, Inc.
- 当前专利权人地址: US IL Chicago
- 主分类号: H02M7/537
- IPC分类号: H02M7/537 ; H02M1/08 ; H03K3/012 ; H03K17/082 ; H03K17/16 ; H03K17/687 ; H03K17/0412 ; H02M1/00
摘要:
In a switching converter having an inductive load, a current may flow through the body diode of a transistor even though the gate of the transistor is being controlled to keep the transistor off. Then when the other transistor of the switch leg is turned on, a reverse recovery current flows in the reverse direction through the body diode. To reduce switching losses associated with such current flows, a gate driver integrated circuit detects when current flow through the body diode rises above a threshold current. The gate driver integrated circuit then controls the transistor to turn on. Then when the other transistor of the switch leg is made to turn on, the gate driver first turns the transistor off. When the gate-to-source voltage of the turning off transistor drops below a threshold voltage, then the gate driver integrated circuit allows and controls the other transistor to turn on.
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