Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1981-05-29
1984-01-24
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
361 93, 361103, 361106, 361100, H02H 308, H02H 720
Patent
active
044280165
ABSTRACT:
An overload protected switching regulator for applying power to a load is disclosed. A power switch (PS1, PS2), connected to control the flow of current between the DC input and the output of the regulator, is closed at a fixed rate each time a flip-flop (23, 33) is set by a pulse produced by an oscillator (21, 31). When the regulator is operated at its rated current, or less, an output voltage detector (25, 37) applies a pulse to the reset input of the flip-flop (23, 33) during each period of oscillation. The timing of the reset pulse is such that the open/closed ratio of the power switch (PS1, PS2) is the exact ratio required to maintain the output voltage of the regulator at the desired level. A current limit detector (27, 39) detects current flow through the power switch. In the event abnormal loading occurs, whereby the current flow through the power switch attempts to exceed its rated value, the current limit detector (27, 39) generates a pulse that resets the flip-flop (23, 33) prior to the voltage detector (25, 37) producing a reset pulse.
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Salce Patrick R.
The Boeing Company
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