METHOD AND DEVICE FOR RELAY-ACTUATED CURRENT GENERATION Russian patent published in 2006 - IPC H02M5/453 

FIELD: semiconductor converter engineering; dc and ac drives and electrical installations.

SUBSTANCE: proposed method includes cyclic load connection (at controller operating frequency) through circuit set up of series-connected diodes and transistors, rectifier, and switch of consumer channel to supply voltage between lines positive with respect to current direction through load (consuming mode), load current growing in the process faster than rate of set signal change by input current of relay-actuated controller; disconnection of consumer-channel switch transistors, current forced out of cut-off transistors being closed through other diodes and transistors of recuperation-channel rectifier and inverter across supply voltage negative with respect to load current direction (recuperation mode) and load current reduction occurring faster than set current change. Load is connected in power recuperation mode across same supply voltage between lines and in consumer mode with polarity reverse to that of consumer mode. Recuperation-circuit transistors open in this case in extreme uncontrolled inverter mode. Proposed device implementing this method has several diode-transistor circuits inserted between supply mains and load and current sensor connected in series with load. This device also has two parallel circuits, consumer and recuperation ones. Consumer circuit is set up of series-connected uncontrolled rectifier and switch provided with relay-actuated controller. Recuperation circuit is set up of uncontrolled rectifier and inverter driven by network incorporating control system. Both circuits are interconnected in parallel opposition; on one end they are connected to load and on other end, to supply mains. These circuits have no common energy storages nor common points with the exception of points of connection to supply mains and load.

EFFECT: improved power characteristics and enhanced reliability of device, simplified design of its control system.

2 cl, 8 dwg