Patent ID: 7825622
Filing Date: 2010-11-02
Classification: H02M,H02P

Abstract:
1. A load driving method for independently driving a plurality (n) of loads connected to a power source by a drive signal, the load driving method comprising: setting a standard duty ratio of a PWM signal within a range of 100/n % or lower; outputting the drive signal including only a standard PWM signal of the standard duty ratio when a level of a drive instruction corresponds to the standard duty ratio, in case energization times of the plurality of loads do not overlap with each other; outputting the drive signal including the standard PWM signal and a continuous non-energization period at a ratio corresponding to the level of the drive instruction, in case a duty ratio determined by the level of the drive instruction is lower than the standard duty ratio; and outputting the drive signal including the standard PWM signal and a continuous energization period at a ratio corresponding to the level of the drive instruction, in case the duty ratio determined by the level of the drive instruction is higher than the standard duty ratio.