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The control circuit and waveforms shown above offer active control for the current which flows in the control windings of a regulating transformer.
English (United States)
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Active Control Circuitry
The control circuit and waveforms shown above offer active control for the
current which flows in the control windings of a regulating transformer.
The sense amplifier compares the output voltage on terminal A to a Constant
internal reference voltage. As the ripple of the output voltage (V(o)) falls below
the reference voltage, the sense amplifier turns on transistor Q1. With transistor
Q1 on, current I(CE) flows through the control windings. When the ripple of V(o)
exceeds the reference voltage, the sense amplifier turns off Q1. At this point,
diode D1 provides a conduction path for the decaying or induced current of the
control windings until the cycle repeats itself.
With this regulating scheme, transistor Q1 stimulates the start of the control
current while it is in saturation. The remainder of the control current is then
controlled by diode D1 which also has a low conducting voltage. The result is
that typically less than 1% of the total output power is dissipated across the solid-
state control devices, instead of the usual 10 to 60 percent in other regulating
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