Cycloconverter silicon controlled rectifier gate signal delay circuit

Claim 2

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay circuit for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until the phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gatecathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases to gate this device conductive through said anode-cathode electrodes, and means responsive to the flow of current through said forward poled silicon controlled rectifier for delaying the application of said cycloconverter silicon controlled rectifier gate signals to the said cycloconverter silicon controlled rectifiers next to be gated conductive for energizing the same phase winding in the opposite direction until current flow through said silicon controlled rectifier has reduced to substantially zero.

Claim 3

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay circuit for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until the phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrOdes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, at least two coils for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers and one of said coils in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier and the other said coil in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of across each said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and means responsive to the flow of current through the one of said coils connected in series with said forward poled silicon controlled rectifier for delaying the application of said cycloconverter silicon controlled rectifier gate signals to the said cycloconverter silicon controlled rectifiers next to be gated conductive for energizing the same phase winding in the opposite direction until current flow through said coil has reduced to substantially zero.

Claim 4

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay circuit for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until the phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrOdes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, at least two coils for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers and one of said coils in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier and the other said coil in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of across each said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and means responsive to the flow of current through the one of said coils connected in series with said forward poled silicon controlled rectifier for delaying the application of said cycloconverter silicon controlled rectifier gate signals to the said cycloconverter silicon controlled rectifiers next to be gated conductive for energizing the same phase winding in the opposite direction until current flow through said coil has reduced to substantially zero.

Claim 5

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal and a gate signal inhibit circuit including an input transistor having a control and two current carrying electrodes corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and a respective magnetically operated reed-type switch magneTically coupled to the magnetic field produced by the flow of phase current through said forward poled silicon controlled rectifier having two normally open current carrying elements connected across said control electrode and a selected one of said current carrying electrodes of said input transistor of each one of said gate signal inhibit circuits corresponding to the said cycloconverter silicon controlled rectifiers next to be gated conductive to energize the same phase winding of the motor in the opposite direction.

Claim 6

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal and a gate signal inhibit circuit including an input transistor having a control and two current carrying electrodes corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and a respective magnetically operated reed-type switch magneTically coupled to the magnetic field produced by the flow of phase current through said forward poled silicon controlled rectifier having two normally open current carrying elements connected across said control electrode and a selected one of said current carrying electrodes of said input transistor of each one of said gate signal inhibit circuits corresponding to the said cycloconverter silicon controlled rectifiers next to be gated conductive to energize the same phase winding of the motor in the opposite direction.

Claim 7

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal and a gate signal inhibit circuit including an input transistor having a control and two current carrying electrodes corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay circuit for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until the phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, at least two coils for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers and one of said coils in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier and the other said coil in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and a respective magnetically operated reed-type switch magnetically coupled to the magnetic field produced by the flow of current through the one of said coils connected in series with said forward poled silicon controlled rectifier having two normally open current carrying elements connected across said control electrode and a selected one of said current carrying electrodes of said input transistor of each one of said gate signal inhibit circuits corresponding to the said cycloconverter silicon controlled rectifiers next to be gated conductive to energize the same phase winding of the motor in the opposite direction.

Claim 8

In a cycloconverter system for cyclically energizing the phase windings of an alternating current motor from an alternating current supply potential source having a cycloconverter circuit made up of a network of cycloconverter silicon controlled rectifiers through which the phase windings of the motor are energized and a silicon controlled rectifier gate switch for producing a cycloconverter silicon controlled rectifier gate signal and a gate signal inhibit circuit including an input transistor having a control and two current carrying electrodes corresponding to each cycloconverter silicon controlled rectifier, a cycloconverter silicon controlled rectifier gate signal delay circuit for delaying the application of the cycloconverter silicon controlled rectifier gate signals to the cycloconverter silicon controlled rectifiers next to be gated conductive to energize in the opposite direction a phase winding of the motor through which conduction has just been terminated until the phase current has reduced to substantially zero comprising, two silicon controlled rectifiers, each having anode, cathode and gate electrodes, for each said phase winding of said motor, two capacitors for each said phase winding of said motor, two resistors for each said phase winding of said motor, at least two coils for each said phase winding of said motor, means for connecting said anode-cathode electrodes of one of said silicon controlled rectifiers and one of said coils in series with the parallel combination of one of said capacitors and one of said resistors and for connecting said anode-cathode electrodes of the other said silicon controlled rectifier and the other said coil in series with the parallel combination of the other said capacitor and the other said resistor across each phase winding of said motor with said silicon controlled rectifiers poled in an opposite polarity relationship, means for producing a gate signal when conduction through each one of said phase windings of said motor is to be terminated, means for applying said gate signal across said gate-cathode electrodes of the one of said silicon controlled rectifiers connected across the said phase winding of said motor through which conduction is to be terminated which is forward poled by the potential induced in the phase winding as the magnitude of phase current flow therethrough decreases, and a respective magnetically operated reed-type switch magnetically coupled to the magnetic field produced by the flow of current through the one of said coils connected in series with said forward poled silicon controlled rectifier having two normally open current carrying elements connected across said control electrode and a selected one of said current carrying electrodes of said input transistor of each one of said gate signal inhibit circuits corresponding to the said cycloconverter silicon controlled rectifiers next to be gated conductive to energize the same phase winding of the motor in the opposite direction.