Converter apparatus using source-activated discharge circuits
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United States of America Patent
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-
Dec 22, 2020
Grant Date -
Sep 27, 2018
app pub date -
Mar 23, 2017
filing date -
Mar 23, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus, such as a variable frequency drive (VFD), includes a rectifier, a DC bus coupled to an output of the rectifier and at least one capacitor coupled to the DC bus. The apparatus further includes a normally-conducting switch coupled to the DC bus and configured to discharge the at least one capacitor in a conducting state and a control circuit configured to control the normally-conducting switch responsive to an input to the rectifier. The control circuit may be configured to control the normally-conducting switch responsive to a voltage at the input of the rectifier. The control circuit may include a regulator circuit having an input coupled to the input of the rectifier and a driver circuit coupled to an output of the regulator circuit and configured to drive a control terminal of the normally-conducting switch.
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