초록 ▼

An a.c. regulator is disclosed including series and shunt choppers connected between a source of alternating current and an output, each chopper including a pair of unidirectional controlled rectifying paths connected in parallel opposition. The invention is characterized by the provision of a contr

An a.c. regulator is disclosed including series and shunt choppers connected between a source of alternating current and an output, each chopper including a pair of unidirectional controlled rectifying paths connected in parallel opposition. The invention is characterized by the provision of a control circuit including a load current sensor for sensing the direction of flow of load current, the control being connected to render conductive a selected one of the transistors in the shunt chopper alternately with a selected one of the transistors in the series chopper, the alternation occurring at a frequency that is high relative to the supply voltage frequency.

대표청구항 ▼

In an electric regulating apparatus including (a) input terminal means adapted for connection with a source of alternating current; (b) output terminal means adapted for connection with a load; (c) series chopper means connected in series between said input terminal means and said output terminal me

In an electric regulating apparatus including (a) input terminal means adapted for connection with a source of alternating current; (b) output terminal means adapted for connection with a load; (c) series chopper means connected in series between said input terminal means and said output terminal means, said series chopper means including two unidirectional controlled rectifying paths connected in parallel opposition; (d) shunt chopper means connected in parallel across said output terminal means, said shunt chopper means including two unidirectional controlled rectifying paths connected in parallel opposition; and (e) control means for controlling said rectifying paths of said series and shunt chopper means by providing switching signals to said series and shunt chopper means at a frequency higher than that of said alternating current source; the improvement which comprises (f) load current sensing means for sensing the direction of flow of current between said input and said output terminal means; (g) said control means being responsive to said load current sensing means for rendering conductive first controlled rectifying paths in said series and in said shunt chopper means at said higher frequency when said flow of current is in one direction, and for alternately rendering conductive second controlled rectifying paths in said series and in said shunt rectifying means at said higher frequency when said flow of current is in the other direction, said alternately conductive paths in said series and shunt rectifying means being so selected as to enable flow of load current in the sensed direction, respectively.