Patent ID: 7049784
Filing Date: 2006-05-23
Classification: H02M,H02P

Abstract:
1. A drive voltage generating apparatus having a plurality of drive voltage generating sections, wherein each drive voltage generating section corresponds to one of a plurality of load devices and outputs a drive voltage to the corresponding load device, wherein each drive voltage generating section includes: a switching element that switches a direct current voltage to generate the drive voltage; sampling means that samples an analog signal representing a load state of the corresponding load device; and controlling means, wherein the controlling means causes the sampling means to perform sampling according to a predetermined control period, and wherein, based on a result of the sampling, the controlling means controls the switching element, wherein the apparatus further comprises: synchronizing means that synchronizes the control periods of all the drive voltage generating sections, wherein each controlling means commands the corresponding sampling means to sample the analog signal at timing where any of the switching elements in the drive voltage generating sections does not perform switching.