Fenwick & West LLP
Switching power converter with secondary to primary messaging
A primary-only power supply enables transmission of a signal or message from the secondary side of an isolated power supply to the primary side. To enable robust detection of the message without interfering with primary side sensing for output regulation, a configurable impedance current path is configured between the primary winding and ground. The primary side controller controls the configurable impedance current path to have a relatively low impedance during the normal mode and a relatively high impedance during the messaging mode.
Dialog Semiconductor Inc.
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Jianming Junjie Pengju Yong
Yao Zheng Kong Li