Patent ID: 8203233
Filing Date: 2012-06-19
Classification: H03K

Abstract:
1. A PWM control apparatus for periodically providing pulse outputs as PWM outputs for loads, each of the loads driven by PWM driving scheme in each of multiple channels after generating respectively different PWM outputs for the multiple channels, the apparatus comprising: an assignment unit for assigning priority to respective PWM outputs in the multiple channels according to an amplitude of each of the PWM outputs; a first unit (a) for setting, as a start time of a cycle time of the pulse output, a rising edge of a first PWM output that has a top priority assigned by the assignment unit, and (b) for setting, as a falling edge of the first PWM output, at a timing of a pulse width length multiplied by the cycle time of the pulse output relative to the start time of the cycle time, and (c) for setting, as an amplitude of the PWM output, an output margin at the falling edge of the first PWM output; and a second unit for setting, as a rising edge of a second PWM output that has a second-place priority assigned by the assignment unit, (a) the falling edge of the first PWM output if the amplitude of the second PWM output is smaller than the output margin at the falling edge of the first PWM output, or (b) the start time of the cycle time if the amplitude of the second PWM output is greater than the output margin at the falling edge of the first PWM output.