Power control or conversion apparatus

Claim 2

A power control or conversion apparatus comprising: a controlled rectifier element; an inductor having one end connected to one end of said controlled rectifier element; a first rectifier element having one end connected to the other end of said controlled rectifier element in reverse series combination; reverse bias means connected between the one end of said controlled rectifier element and the other end of said rectifier element for applying a reverse bias voltage pulse to said controlled rectifier element though said rectifier element for turning off said controlled rectifier element; switching means connected between the other end of said inductor and the other end of said rectifier element through a DC power source; an output terminal connected to both the other end of said controlled rectifier element and the one end of said rectifier element; and a second rectifier element connected between the other end of said inductor and the other end of said controlled rectifier element; said switching means being cut off in synchronism with the turning-off of said controlled rectifier element, and said reverse biasing means applying said reverse bias voltage pulse to said controlled rectifier element during the cut-off state of said switching means.

Claim 3

A power control or conversion apparatus comprising: a first circuit including at least a pair of controlled rectifier elements connected in series forming a first junction in the forward direction to each other; a second circuit consisting of at least a pair of rectifier elements connected in series forming a second junction in the forward direction to each other; a first inductor connected between the anode end of said first circuit and the cathode end of said second circuit; a second inductor connected between the cathode end of said first circuit and the anode end of said second circuit; a third circuit including a switching means, said switching means consisting of a solid state switch, and including a DC power source connected in series in the forward direction to said switching means; said third circuit connected between the cathode end of said second circuit and the anode end of said second circuit; an output terminal connected to both of the first junction of said first circuit and the second circuit; and reverse biasing means connected between at least one terminal-pair of the following three terminal-pairs (a) the terminal-pair of the anode end and cathode end of said first circuit, (b) the terminal-pair of the anode end of said first circuit and anode end of said second circuit, (c) the terminal-pair of the cathode end of said first circuit and cathode end of said second circuit; said switch being cut off in synchronism with a turning off of said controlled rectifier elements, said reverse biasing means applying a reverse bias voltage pulse to said controlled rectifier elements for turning-off said controlled rectifier elements during the cut-off state of said switching means.

Claim 4

A power control or conversion apparatus comprising: a first circuit including at least a pair of controlled rectifier elements connected in series forming a first junction in the forward direction to each other; a second circuit consisting of at least a pair of rectifier elements connected in series forming a second junction in the forward direction to each other; a first inductor connected between the anode end of said first circuit and the cathode end of said second circuit; a second inductor connected between the cathode end of said first circuit and the anode end of said second circuit; a third circuit including a switching means, said switching means consisting of a solid state switch, and including a DC power source connected in series in the forward direction to said switching means; said third circuit connected between the cathode end of said second circuit and the anode end of said second circuit; an output terminal connected to both of the first junction of said first circuit and the second circuit; and reverse biasing means connected between at least one terminal-pair of the following three terminal-pairs (a) the terminal-pair of the anode end and cathode end of said first circuit, (b) the terminal-pair of the anode end of said first circuit and anode end of said second circuit, (c) the terminal-pair of the cathode end of said first circuit and cathode end of said second circuit; said switch being cut off in synchronism with a turning off of said controlled rectifier elements, said reverse biasing means applying a reverse bias voltage pulse to said controlled rectifier elements for turning-off said controlled rectifier elements during the cut-off state of said switching means.

Claim 5

A power control or conversion apparatus according to claim 2, wherein: said reverse biasing means includes a commutation capacitor.

Claim 6

A power control or conversion apparatus according to claim 3, wherein: said reverse biasing means comprises a series circuit including a commutation capacitor and a reactor.

Claim 7

A power control or conversion apparatus according to claim 3, wherein: said reverse biasing means includes a commutation capacitor and an auxiliary solid state switch.

Claim 8

A power control or conversion apparatus according to claim 2, wherein: said reverse biasing means includes an auxiliary solid state switch and an auxiliary power source.

Claim 9

A power control or conversion apparatus according to claim 2 wherein: said first circuit consists of a plurality of said pair of controlled rectifier elements for forming the bridge connected controlled-rectifier circuit, and a plurality of first junctions each connected to the plurality of said output terminals; said second circuit consists of the plurality of said pair of said rectifier elements for forming the bridge connected rectifier circuit, and a plurality of second junctions each connected to the plurality of said output terminals.

Claim 10

A power control or conversion apparatus according to claim 2, wherein said solid state switch includes a controlled rectifier component and said reverse biasing means includes a commutation capacitor and an auxiliary solid state switch, said commutation capacitor also reversely biasing said controlled rectifier element of said switching means.

Claim 11

A power control or conversion apparatus according to claim 7 including:

Claim 12

control means for controlling a quantity of AC power supplied to said output terminals by controlling a conduction time ratio of either of said switching means and said controlled rectifier elements.

Claim 13

control means for controlling a quantity of AC power supplied to said output terminals by controlling a conduction time ratio of either of said switching means and said controlled rectifier elements.

Claim 14

A power control or conversion apparatus according to claim 9, wherein: said control means includes a current detecting means for detecting a current in at least one of said first inductor and said second inductor, said conduction time ratio being controlled in response to the output from said detecting means.

Claim 15

A power control or conversion apparatus according to claim 9, wherein: said control means includes an AC output detecting means for detecting a quantity of the AC output power supplied to said output terminals, said conduction time ratio being controlled in response to the output from said AC output detecting means.

Claim 16

A power control or conversion apparatus according to claim 9, wherein: said first inductor and said second inductor are magnetically coupled to each other.

Claim 17

A power conversion apparatus according to claim 7, wherein further comprising: a rotary electric machine having multi-phases of AC windings connected to said plurality of said output terminals connecting to an AC load.

Claim 18

A power conversion apparatus according to claim 13, wherein: said multi-phase AC windings being disposed on a stator of said rotary electric machine and said rotary electric machine further having an electromagnetic rotor to be rotated in a rotating magnetic field which is provided by said multi-phase AC windings and further having a second multiphase AC winding being disposed on said stator for connecting to said AC load.

Claim 19

A power conversion apparatus according to claim 13 wherein: said rotary electric machine further has a squirrel cage of conductors disposed on a rotor of said rotary electric machine.