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发明授权
CN105846695B 用于同步整流器的自供电 有权

用于同步整流器的自供电
摘要：
本公开涉及用于同步整流器的自供电。其中具有隔离拓扑的电源转换器可包括初级侧和次级侧。次级侧包括自供电同步整流器。同步整流器包括至少具有漏极和栅极的同步整流器晶体管、至少具有耦合至同步整流器晶体管的漏极的输入端的电压调节器、以及至少具有耦合至同步整流器晶体管的漏极的漏极的辅助晶体管。辅助晶体管与同步整流器晶体管位于相同裸片上。同步整流器还包括至少具有耦合至辅助晶体管的栅极的输出端的钳位器件以及栅极驱动器电路，栅极驱动器电路至少具有耦合至电压调节器的输出的电源输入端和耦合至同步整流器晶体管的栅极的输出端。
摘要（英）：

A power converter with an isolated topology may include a primary side and a secondary side. The secondary side includes a self-powered synchronous rectifier. The synchronous rectifier includes a synchronous rectifier transistor having at least a drain and a gate, a voltage regulator having at least an input that is coupled to the drain of the synchronous rectifier transistor, and an auxiliary transistor having at least a drain that is coupled to the drain of the synchronous rectifier transistor. The auxiliary transistor is on a same die as the synchronous rectifier transistor. The synchronous rectifier also includes a clamping device having at least an output that is coupled to the gate of the auxiliary transistor, and a gate driver circuit having at least: a power supply input that is coupled to the output of the voltage regulator, and an output that is coupled to a gate of the synchronous rectifier transistor.

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