Control for an auxiliary commutation circuit
First Claim
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1. An inverter for converting DC electrical energy into AC electrical energy, comprising:
- main semiconductor switch means responsive to a control waveform for periodically translating said switch means between its conducting and nonconducting states;
commutation means including a primary portion and an auxiliary portion, each of which is controlled by a commutation switch means;
generator means for creating a plurality of control waveforms to actuate said main semiconductor switch means and said commutation switch means; and
control means for providing control signals to said commutation means and, in response to an overcurrent condition, for modifing said control waveform so that said primary portion and said auxiliary portion of said commutation means operate in unison to translate said main semiconductor switch means to its nonconducting state.
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Abstract
A supplemental or auxiliary portion of the commutation circuit for an inverter is actuated only during overload conditions which improve the inverter efficiency during normal load conditions. A control circuit responds to the increased time period of the commutation pulse to delay the firing of the thyristors which initiate the makeup pulse. This modified operation continues for at least three commutation cycles in order to ensure that the supplemental portion of the commutation circuit is properly initialized so that it is ready for subsequent overcurrent conditions.
12 Citations
5 Claims
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1. An inverter for converting DC electrical energy into AC electrical energy, comprising:
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main semiconductor switch means responsive to a control waveform for periodically translating said switch means between its conducting and nonconducting states; commutation means including a primary portion and an auxiliary portion, each of which is controlled by a commutation switch means; generator means for creating a plurality of control waveforms to actuate said main semiconductor switch means and said commutation switch means; and control means for providing control signals to said commutation means and, in response to an overcurrent condition, for modifing said control waveform so that said primary portion and said auxiliary portion of said commutation means operate in unison to translate said main semiconductor switch means to its nonconducting state. - View Dependent Claims (2, 3, 4, 5)
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Specification