Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1988-06-09
1990-03-06
Shoop, Jr., William M.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
363 56, H02H 710
Patent
active
049071165
ABSTRACT:
A MOSFET power switching transistor in a DC-to-DC converter of a television apparatus has a drain electrode that is coupled via a primary winding of a chopper transformer to an input supply voltage. A first signal at a given frequency causes, during normal operation, alternate conduction and nonconduction in the transistor. A second signal is generated that is proportional to the voltage developed across the internal "on" resistance of the transistor when the transistor is conductive. The second signal is clamped when the MOSFET transistor is nonconductive. The second signal is coupled via a current sensing arrangement to the transistor gate. The second signal prevents the transistor from further conducting when the amplitude of the second signal exceeds a predetermined value that corresponds with a predetermined limiting threshold level of current in the transistor.
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Aschwanden Felix
Bart Theodor E.
Haferl Peter E.
Henig Sammy S.
Laks Joseph J.
RCA Licensing Corporation
Shoop Jr. William M.
Tripoli Joseph S.
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