Multi-Mode Operation and Control of a Resonant Converter

摘要

In accordance with an embodiment, a method of controlling a switched-mode power includes generating a feedback signal proportional to an output of the switched-mode power supply, and operating the switched-mode power supply in a normal mode. If the feedback signal crosses a first threshold, the switched-mode power operates in a second operating mode. In the first operating mode the pulse modulated signal is adjusted to regulate a feedback signal to a first signal level, and in the second operating mode, a dead-time of the pulse modulated signal is adjusted to signal to regulate a feedback signal to a second signal level different from the first signal level. The method further includes driving a switch of the switched-mode power supply with the pulse modulated signal.

主权项

1. A method of controlling a switched-mode power supply, the method comprising:
operating the switched-mode power supply in a normal operating mode comprising regulating a feedback signal to a first signal level; and when the feedback signal crosses a first threshold, operating the switched-mode power supply in a second operating mode comprising
periodically asserting a high-side switch signal and a low-side switch signal having a dead-time between each assertion of the high-side switch signal and each assertion of the low-side switch signal, andadjusting the dead-time to regulate the feedback signal to a second signal level different from the first signal level.