Patent ID: 6111383
Filing Date: 2000-08-29
Classification: H02P

Abstract:
A controller for feeding chopped electricity comprising:means for generating an actual current signal which shows a current actually flowing through a load,means for generating a reference current signal which shows a reference current value that should flow through the load,timing generating means for generating a reference chopping timing having a constant period,means for generating a saw tooth signal which generates a descending saw tooth signal synchronizing with the reference chopping timing and having a constant amplitude, means for generating a compensation reference current signal adding the descending saw tooth signal to the reference current signal,binary signal generating means for generating a binary signal which is set to a first level when the actual current signal falls below the compensation reference current signal by the result of the comparison between the actual current signal and the compensation reference current signal and which is set to a second level when the actual current signal is greater than the compensation reference current signal,enable flag signal generating means for generating an enable flag signal which is set to a first level whenever the binary signal is turned to off from on status and which is set to a second level whenever the reference chopping timing comes, andswitching means which turns the feeding of the current to the load from on status to off status in response to the switching of the binary signal from the first level to the second level when the enable flag signal is in the first level and which turns the feeding of the current to the load from off status to on status in response to the switching of the binary signal from the second level to the first level when the enable flag signal is in the second level.