Frequency converter circuit including a single-ended blocking frequency converter

Claim 1

A converter circuit with a single-ended single-phase block converter, comprising, a transformer with a primary winding (3a) which is connected to a DC voltage source through an electronic switch, a secondary winding (3b) of said transformer, a rectifier (4) connected to said secondary winding, a storage-capacitor (5) connected across said rectifier and said secondary winding, a first output connected across said storage capacitor, a pulse width modulator (7) connected to the control of said electronic switch, a control unit (8) connected to said pulse width modulator and receiving an input from said transformer, at least one other secondary circuit (A2, A3) connected to another secondary winding (3d) of said transformer (3) so as to generate a voltage which is smaller than the output voltage of said first output, said secondary circuit (A2, A3) containing, in a series arm, a second rectifier (13) and a second electronic switch (12), a second control unit connected to the control element of said second electronic switch, a recovery diode (14), connected across said another secondary winding, said second rectifier and said second electronic switch, an inductor (15) and a second capacitor (17) connected in parallel with said recovery diode (14), said second capacitor (17) forming another output circuit of said converter circuit, said second rectifier (13) and said recovery diode (14) are connected together so that like terminals are adjacent, and the sense of winding of said other secondary winding (3da, 3ea) is selected such that said other output circuit together with the primary circuit of said block converter form a flow converter.