Digital Control
Digital Control
Digital Control
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► Challenge:<br />
Challenge of <strong>Control</strong>ling Resonate Converter<br />
• Wide range of PWM switching frequency from 100KHz up to 1Mhz<br />
• Need to make a change to the PWM period without changing the duty cycle for up to 4 channels of<br />
PWM within one period of the existing PWM<br />
• PWM period change must be in a few nanosecond<br />
► Solution:<br />
• High speed digital PWM plus Analog edge delay<br />
• PWM duty cycles are calculated by high speed controller<br />
• Special circuit is used to automatically increment the PWM period by repositioning edges<br />
Original PWM<br />
Initial PWM period<br />
Modification to both PWM edges<br />
New PWM period<br />
New PWM<br />
PWM period requires small incremental adjustment<br />
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