Power Integrations, Inc.

Lino Del Pup

Roger Colbeck

Robert J Mayell

Hartley Fred Horwitz

A controller for use in a power converter that is configured to operate in a plurality of modes including a first mode and a second mode includes a frequency monitor module coupled to measure a signal characteristic of a switch drive signal coupled to control switching of a switches block of the power converter. The frequency monitor module includes a memory coupled to store a measured signal characteristic of the switch drive signal measured during the first mode. The frequency monitor module is coupled to generate a clock signal in response to the measured signal characteristic stored in the memory. The switch drive signal is coupled to be generated in response to the clock signal during the second mode.

Apparatus and methods for controlling a switch drive signal following mode transitions in a switching power converter

Circuits and processes for detecting a peak value of an input signal are disclosed. In one example, a peak detector circuit may sample a line sense signal, determine the peak value of the line sense signal during a search window, and output a peak detection signal representative of the determined peak value. In a first mode, the peak detector circuit may cause the peak detection signal to be representative of the determined peak value from an immediately preceding search window. In a second mode, the peak detector circuit may cause the peak detection signal to follow the sampled line sense signal. The peak detector circuit may operate in the second mode in response to the sample of the line sense signal being greater than a peak value of the line sense signal from an immediately preceding search window by more than a threshold amount.

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Lino Del Pup