Inverter circuit utilizing the reverse voltage capabilities of symmetrical gate turn off thyristors
First Claim
1. A method of restoring energy associated with transient signal compensation in a portion of a power conversion circuit to a power supply providing a power supply signal having a voltage magnitude following commutation of said circuit portion, said circuit portion including first and second switching devices configured to receive and transmit signals of a selected polarity, said devices coupled in series with a first reactive element therebetween and associated shunt capacitive and reactive elements, said first reactive element divided by a tap into first and second portions each configured with an associated one of said shunt reactive elements, said first reactive element for providing signals at said tap to a first electrode of a second, regenerative reactive element having first and second sections serially connected at a junction, with a first diode and a second diode anti-parallel therewith configured at said junction and further having a first regenerative diode and a second regenerative diode anti-parallel therewith configured with a second electrode of said second regenerative reactive element, said method comprising the steps of:
- generating energy from said signal commutation;
storing energy in said capacitive and first reactive elements; and
transferring said stored energy to said power supply including the step of providing signals of a reverse polarity to said first and second switching devices by generating across said first and second shunt reactive elements signals having a voltage reduced in magnitude from said power supply signal voltage magnitude.
1 Assignment
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Accused Products
Abstract
A novel inverter circuit having symmetrical gate turnoff thyristors (GTO) includes reactive circuit elements for recovering stored energy. The circuit is characterized by a center tapped transformer configured without tightly coupled anti-parallel diodes, thereby allowing for the presentation of reverse voltages to each GTO.
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Citations
11 Claims
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1. A method of restoring energy associated with transient signal compensation in a portion of a power conversion circuit to a power supply providing a power supply signal having a voltage magnitude following commutation of said circuit portion, said circuit portion including first and second switching devices configured to receive and transmit signals of a selected polarity, said devices coupled in series with a first reactive element therebetween and associated shunt capacitive and reactive elements, said first reactive element divided by a tap into first and second portions each configured with an associated one of said shunt reactive elements, said first reactive element for providing signals at said tap to a first electrode of a second, regenerative reactive element having first and second sections serially connected at a junction, with a first diode and a second diode anti-parallel therewith configured at said junction and further having a first regenerative diode and a second regenerative diode anti-parallel therewith configured with a second electrode of said second regenerative reactive element, said method comprising the steps of:
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generating energy from said signal commutation; storing energy in said capacitive and first reactive elements; and transferring said stored energy to said power supply including the step of providing signals of a reverse polarity to said first and second switching devices by generating across said first and second shunt reactive elements signals having a voltage reduced in magnitude from said power supply signal voltage magnitude.
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2. In a direct current power converter, a power conversion circuit section for extinguishing (snubbing) without power loss signal transients in a received power supply electrical signal having an associated current and voltage magnitude, said circuit section comprising:
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first and second series coupled symmetrical switching devices receiving said signal, said devices configured to only receive from said power supply signals of a selected polarity; a first reactive element having a signal tap dividing said first reactive element into two portions, said element serially configured between said devices; shunt first and second snubber circuits associated with said first and second switching devices, each snubber circuit having a capacitor, diode and inductive element respectively configured with said first reactive element portions for generating across said snubber circuit inductive elements signals whose voltage magnitude is of a reduced magnitude as compared to the power supply electrical signal magnitude; and a second, regenerative reactive element having a first electrode configured with said first reactive element tap and having first and second sections serially connected at a junction, with a first diode and a second diode anti-parallel therewith configured at said junction and further having a first regenerative diode and a second regenerative diode anti-parallel therewith configured with a second electrode of said second regenerative reactive element, said second reactive element and said diodes electrically configured to allow reverse polarity signal voltages of a selected magnitude on said devices, thereby enabling energy associated with said extinguished (snubbed) signals stored in said circuit section to be provided back to said power supply. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification