Power converter for AC power supply, or as battery charger-discharger, motor controls etc. - has output node that is connected to load and modulating device for opening and closing switches in sequence in which electrical currents controlled by switches are in opposition to one another

摘要

The converter includes a pair of switches (50,56) connected between two DC voltage sources (54,58) and an output node common to each of the switches. The output node is connected to a load (74). A modulating device for opening and closing the switches in a sequence in which the electrical currents controlled by the switches are in opposition to one another. The electrical currents are summed at the output node. The modulating device includes a device for opening and closing each of the switches at a controllable duty cycle. The modulating device includes device for controlling the output of the output node by increasing and decreasing the duty cycle of one of the switches while correspondingly decreasing and increasing the duty cycle of the other switch.