Method and implementation for eliminating random pulse during power up of digital signal controller

摘要

A switching mode power converter includes a DSC with a digital PWM module configured for complementary operation mode during normal operation. The control algorithm of the DSC is configured such that during an initialization stage immediately following power up of the device relevant digital PWM modules used for interleaving operation are reconfigured to temporarily operate in an independent operation mode with the duty cycle associated with each channel set at zero. The reconfigured digital PWM modules remain set in the independent operation mode for a predefined period of time. Once the predefined time period is reached, the reconfigured digital PWM modules are again reconfigured back to the original complementary operation mode configuration and the control algorithm resumes normal operation of the DSC and digital PWM modules.

主权项

1. A method of eliminating random pulses during power up of a device, the method comprises:
a. configuring each of one or more digital pulse width modulators within a switching mode power supply to operate in an independent operation mode and a complementary operation mode; b. at power up of the switching mode power supply, operating each digital pulse width modulator in the independent operation mode and continuing to operate each digital pulse width modulator in the independent operation mode for a predetermined period of time; c. changing the operation of each digital pulse width modulator from the independent operation mode to the complementary operation mode after the predetermined period of time expires, wherein changing the operation occurs during an initialization stage; and d. during a normal operation following the initialization stage, operating each digital pulse width modulator in the complementary operation mode.