Importance

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Abstract

An inverter circuit is disclosed in which the alternating current output is rectified to become a DC power supply with a regulated output voltage. The inverter is controlled to limit the peak current conducted by the power semiconductors and a current limit circuit is provided to limit the DC output current. The invention provides an output current sensing circuit utilizing a current transformer, with the primary winding thereof connected in the alternating current portion of the inverter circuit and with current flow in the primary winding proportional to the DC output. Rectifier means is provided to rectify the output of the secondary winding of the current transformer, and this is supplied across a first resistor. There is means to sample the voltage across this first resistor only during the conduction period of the power semiconductors. An integrating means is provided to integrate the sampled voltage and develop an output current signal for control of the output current from the inverter circuit. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

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First Claim