Power supply circuit arrangement utilizing regenerative current feedback

Claim 2

In a transistorized power supply, a pair of switching transistors for providing power from a source to a load whenever one of said switching transistors is forward biased, switching means including first current pulse generator means for providing a first set of current pulses for forward biasing a first one of said switching transistors, second current pulse generator means for providing a second set of current pulses for forward biasing the second switching transistor, circuit means including transformer means having a plurality of control windings for coupling said first and second sets of current pulses from said first and second current pulse generator means to said first and second switching transistors to respectively control enablement of said first and second switching transistors and feedback means operative to provide a regenerative current for the enabled one of the transistors, enabling means for selectively controlling said first and second current pulse generator means to operate at alternate time periods, and turnoff means including a winding on said transformer means and a control transistor operable when enabled to effectively short circuit said winding on said transformer means to effect the turnoff of the forward biased one of said switching transistors.

Claim 3

A transistorized power supply as set forth in claim 1 in which said transformer means includes a first secondary winding connected to said one switching transistor, a second secondary winding connected to said second switching transistor, and a first primary winding connected to said first current pulse generator for coupling said first set of current pulses over said secondary windings to forward bias said first switching transistor and to reverse bias said second switching transistor, and a second primary winding connected to said second current pulse generator means for coupling said second set of current pulses over said secondary winding to reverse bias said first switching transistor and to forward bias said other switching transistor.

Claim 4

A transistoriZed power supply as set forth in claim 1 in which said enabling means provides signals at a logic level for said first and second current pulse generator means and said turnoff means, and in which said first current pulse generator includes a first drive transistor enabled by certain ones of said logic pulses to provide said first set of current pulses, and said second current pulse generator means includes a second drive transistor enabled by other ones of said logic pulses to provide said second set of current pulses, and in which said control transistor is enabled by further ones of said logic pulses at a predetermined time after either of said drive transistors is enabled.

Claim 5

A transistorized power supply as set forth in claim 1 in which said feedback means includes a winding which is connected to said transformer means to couple said regenerative current to control inputs for said switching transistors to drive the forward-biased one of the switching transistors into saturation.

Claim 6

In a transistorized power supply, an output transformer having a primary winding, a pair of switching transistors for permitting current from a source to flow through said primary winding whenever one of said switching transistors is forward biased, a first drive transistor operable when enabled to provide first current pulse signals for forward biasing one of said switching transistors during a portion of a control cycle, a second drive transistor operable when enabled to provide second current pulse signals for forward biasing the other one of said switching transistors during a different portion of the control cycle, transformer means having a plurality of control windings for coupling said first and second current pulse signals from said drive transistors to said switching transistors and a feedback winding connected in series with said primary winding of said output transformer to provide a regenerative current over certain of said control windings for driving the one of said switching transistors which is enabled by the current pulse signals into saturation, and turnoff means for effecting selective turnoff of said switching transistors including a control transistor having an output circuit, said transformer means having a turnoff winding connected to the output circuit of said control transistor, said control transistor being operable when enabled to short circuit said turnoff winding to provide a short circuit across said control windings.

Claim 7

In a transistorized power supply, an output transformer having a primary winding, a pair of switching transistors for permitting current from a source to flow through said primary winding whenever one of said switching transistors is forward biased, a first drive transistor operable when enabled to provide first current pulse signals for forward biasing one of said switching transistors during a portion of a control cycle, a second drive transistor operable when enabled to provide second current pulse signals for forward biasing the other one of said switching transistors during a different portion of the control cycle, transformer means having a plurality of control windings for coupling said first and second current pulse signals from said drive transistors to said switching transistors and a feedback winding connected in series with said primary winding of said output transformer to provide a regenerative current over certain of said control windings for driving the one of said switching transistors which is enabled by the current pulse signals into saturation, and turnoff means for effecting selective turnoff of said switching transistors including a control transistor having an output circuit, said transformer means having a turnoff winding connected to the output circuit of said control transistor, said control transistor being operable when enabled to short circuit said turnoff winding to provide a short circuit across said control windings.

Claim 8

A transistorized power supply as set forth in claim 5 which includes enabling means comprising means for providing logic pulses for enabling said first and second drive transistors respectively at alternate times to effect the alternate turn on of said switching transistors, and for enabling said control transistor at a predetermined time after the enabling of each drive transistor to effect the turnoff of the one of the switching transistors which is forward biased, the time duration for which current from said source flows over said primary winding being variable by changing the time at which said control transistor is enabled.

Claim 9

A transistorized power supply as set forth in claim 5 in which each of said drive transistors has an output circuit connected in series with an associated one of said transformer windings to permit current to flow from a source over such winding as enabled.

Claim 10

A power supply as set forth in claim 5 including a pair of capacitors connected in series across said source, said switching transistors having output circuits serially connected across said source, and wherein said primary winding and said feedback winding are serially connected between the junction of said capacitors and the junction of said switching transistor output circuits.

Claim 11

In a transistorized inverter, source means, a circuit path including an output transformer having a primary winding connected in said circuit path and a secondary winding, a first switching transistor connected between said source means and said circuit path to peRmit current from said source means to flow over said circuit path and said primary winding in one direction whenever said first switching transistor is forward biased, a second switching transistor connected between said source means and said circuit path to permit current from said source means to flow over said primary winding in the opposite direction whenever said second switching transistor is forward biased, a first drive transistor operable when enabled to provide first drive signals for forward biasing said first switching transistor during a portion of a control cycle, a second drive transistor operable when enabled to provide second drive signals for forward biasing said second switching transistor during a different portion of the control cycle, control transformer means having a plurality of control windings for coupling said drive signals from said drive transistors to said switching transistors and a feedback winding serially connected in said output circuit path for conducting the current flowing over said circuit path whenever one of said switching transistors is forward biased for coupling drive current to the forward biased one of the switching transistors for driving said forward biased switching transistor into saturation, enabling means for providing logic pulses for enabling said drive transistors at alternate times during said control cycle and turnoff means including a turnoff winding on said control transformer and a control transistor operable when enabled to effectively short circuit said turnoff winding to effect the turnoff of the forward biased one of the switching transistors.

Claim 12

In a transistorized inverter, source means, a circuit path including an output transformer having a primary winding connected in said circuit path and a secondary winding, a first switching transistor connected between said source means and said circuit path to peRmit current from said source means to flow over said circuit path and said primary winding in one direction whenever said first switching transistor is forward biased, a second switching transistor connected between said source means and said circuit path to permit current from said source means to flow over said primary winding in the opposite direction whenever said second switching transistor is forward biased, a first drive transistor operable when enabled to provide first drive signals for forward biasing said first switching transistor during a portion of a control cycle, a second drive transistor operable when enabled to provide second drive signals for forward biasing said second switching transistor during a different portion of the control cycle, control transformer means having a plurality of control windings for coupling said drive signals from said drive transistors to said switching transistors and a feedback winding serially connected in said output circuit path for conducting the current flowing over said circuit path whenever one of said switching transistors is forward biased for coupling drive current to the forward biased one of the switching transistors for driving said forward biased switching transistor into saturation, enabling means for providing logic pulses for enabling said drive transistors at alternate times during said control cycle and turnoff means including a turnoff winding on said control transformer and a control transistor operable when enabled to effectively short circuit said turnoff winding to effect the turnoff of the forward biased one of the switching transistors.

Claim 13

A transistorized inverter as set forth in claim 9 in which said source means includes a pair of capacitors connected in series across a voltage source and in which said switching transistors have output circuits serially connected across said voltage source, and in which said output circuit path is connected between the junction of said capacitors and the junction of said switching transistor output circuits.

Claim 14

In a transistorized inverter, a pair of switching transistors for providing power from a power source to a load whenever one of said switching transistors is forward biased, switching means including first drive means for providing first drive signals for forward biasing a first one of said switching transistors during a portion of a control cycle, second drive means for providing second drive signals for forward biasing the second switching transistor during a different portion of the control cycle, circuit means including transformer means having a plurality of windings for coupling said first and second drive signals to said first and second switching transistors at alternate times during said control cycle and a feedback winding operative to provide a regenerative drive current for the enabled one of the switching transistors which is proportional to the collector current of said one transistor, enabling means for providing logic level pulses for controlling selective enablement of said first and second drive means , and turnoff means including a further winding on said transformer means and a control transistor enabled by a further logic level pulse provided by said enabling means at a predetermined time after either of said drive transistors is enabled to effectively short circuit said further winding to effect the turnoff of the forward biased one of said switching transistors.

Claim 15

In a transistorized inverter, a pair of switching transistors for providing power from a power source to a load whenever one of said switching transistors is forward biased, switching means including first drive means for providing first drive signals for forward biasing a first one of said switching transistors during a portion of a control cycle, second drive means for providing second drive signals for forward biasing the second switching transistor during a different portion of the control cycle, circuit means including transformer means having a plurality of windings for coupling said first and second drive signals to said first and second switching transistors at alternate times during said control cycle and a feedback winding operative to provide a regenerative drive current for the enabled one of the switching transistors which is proportional to the collector current of said one transistor, enabling means for providing logic level pulses for controlling selective enablement of said first and second drive means , and turnoff means including a further winding on said transformer means and a control transistor enabled by a further logic level pulse provided by said enabling means at a predetermined time after either of said drive transistors is enabled to effectively short circuit said further winding to effect the turnoff of the forward biased one of said switching transistors.

Claim 16

In a transistorized inverter, a pair of switching transistors for providing power from a source to a load whenever one of said switching transistors is forward biased, switching means including first drive means operable when enabled to provide first drive signals for enabling turn on of a first one of said switching transistors, second drive means operable when enabled to provide second drive signals for enabling turn on of the second switching transistor, transformer means having a plurality of control windings for coupling said first and second drive signals to said first and second switching transistors, enabling means for providing pulses for enabling said first and second drive means, respectively, at alternate times during a control cycle, and turn off means including a control transistor having an output circuit and a further winding of said transformer connected to the output circuit of said control transistor, said control transistor being enabled by further pulses provided by said enabling means at a predetermined time after the enabling of each of said drive means to short circuit said further winding thereby providing a short circuit across said control windings for effecting controlled turn off of said switching transistors.

Claim 17

In a transistorized inverter, a pair of switching transistors for providing power from a source to a load whenever one of said switching transistors is forward biased, switching means including first drive means operable when enabled to provide first drive signals for enabling turn on of a first one of said switching transistors, second drive means operable when enabled to provide second drive signals for enabling turn on of the second switching transistor, transformer means having a plurality of control windings for coupling said first and second drive signals to said first and second switching transistors, enabling means for providing pulses for enabling said first and second drive means, respectively, at alternate times during a control cycle, and turn off means including a control transistor having an output circuit and a further winding of said transformer connected to the output circuit of said control transistor, said control transistor being enabled by further pulses provided by said enabling means at a predetermined time after the enabling of each of said drive means to short circuit said further winding thereby providing a short circuit across said control windings for effecting controlled turn off of said switching transistors.