H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/41
H02M 7/48 (2006.01)
Patent
CA 1119247
ABSTRACT OF THE DISCLOSURE A control system for a pulse width control type invert- er made up of a plurality of switching elements. The system includes a constant voltage control circuit for producing an an- alogue output; an A-D converter for converting said analogue output into a digital signal; a reference pulse generator which generates a reference pulse that determines the output frequency of said inverter; a clock pulse generator which generates a clock pulse in synchronism with said reference pulse and having a fre- quency of an integral multiple of that of said reference pulse; a binary up-counter having a predetermined number of steps and connected to be cleared by said reference pulse and counts up the clock pulses generated by said clock pulse generator; a digital comparator for comparing the output of said binary up-counter with the output of said A-D converter; a m step (m represents an integer) up-counter for counting the building up edge of the out- put of said digital comparator, means responsive to the building up edge of the output of said digital comparator for clearing said binary up-counter thereby repeating m times the counting up and clearing operations of said binary up-counter until said up- counter produces a carry signal so as to use an interval between the generation of said reference pulse and the generation of said carry signal as a signal for determining the conduction period of said switching elements. The control system described above has an excellent transient response for such external disturbances as the variations in the DC voltage and load. The same advan- tageous effect can also be provided by substituting a down coun- ter for the up counter with a slight circuit modification.
362908
Fetherstonhaugh & Co.
Tokyo Shibaura Denki Kabushiki Kaisha
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