- 专利标题: Half-bridge with variable dead band control and zero-voltage switching
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申请号: US17287422申请日: 2019-10-23
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公开(公告)号: US11855526B2公开(公告)日: 2023-12-26
- 发明人: Philip Michael Johnson , Alan Wayne Brown
- 申请人: HELLA GmbH & Co. KGaA
- 申请人地址: DE Lippstadt
- 专利权人: HELLA GmbH & Co. KGaA
- 当前专利权人: HELLA GmbH & Co. KGaA
- 当前专利权人地址: DE Lippstadt
- 代理机构: WARNER NORCROSS + JUDD LLP
- 国际申请: PCT/IB2019/059082 2019.10.23
- 国际公布: WO2020/084532A 2020.04.30
- 进入国家日期: 2021-04-21
- 主分类号: H02M1/38
- IPC分类号: H02M1/38 ; H02M1/00 ; H02M3/335
摘要:
An improved method for zero-voltage switching (ZVS) of a voltage-fed half-bridge using a variable dead band is provided. The duration of the dead band is determined dynamically and is precisely long enough to ensure the absence of shoot-through events while also minimizing or eliminating switching losses and reverse conduction losses. The method generally includes: (a) calculating the equivalent capacitance as seen by the current source charging the midpoint of the half-bridge; (b) calculating the ZVS charge requirement based on the link voltage and the equivalent capacitance; (c) calculating the charge delivered by the current source over time during a dead band vector, equating the result to the ZVS charge requirement, and solving for the ZVS time requirement at each commutation point over the switching cycle; and (d) updating the dead bands for each commutation of each half-bridge in the switched-mode power converter.
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