Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1998-02-17
1999-10-12
Berhane, Adolf Deneke
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323224, G05F 1563, G05F 1618
Patent
active
059660040
ABSTRACT:
In an electronic system (100), a regulator (200) couples a supply device (110) to a consuming device (120) through a series switch (210) and provides output current I.sub.OUT. A shunt switch (220) is provided across the output. Fast changes of I.sub.OUT due to switching on and off the consuming device (120) are accommodated by the regulator (200). The regulator (200) has a voltage divider (250, 260) to measure V.sub.OUT. Operational amplifiers (230 and 240') control transistors (210, 220) with different switching thresholds, They compare a measurement voltage V.sub.M derived from V.sub.OUT to a reference voltage V.sub.REF. When the consuming device (120) is switched off, the first amplifier (230) makes the series transistor (210) non-conductive; and then the second amplifier (240') makes the shunt transistor (220) conductive for a short time. Capacitance at the output node (205) is substantially discharged. After overshooting, the voltage V.sub.OUT returns to its previous value. Unwanted undershooting of V.sub.OUT is substantially avoided.
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Atkins Robert D.
Berhane Adolf Deneke
Dover Rennie William
Motorola Inc.
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