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This article describes a transient suppressor using active devices to limit transient voltages to levels below those at which switching regulator components would be damaged.
English (United States)
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Active Transient Suppressor for Line Operated Switching Regulator
This article describes a transient suppressor using active devices to limit
transient voltages to levels below those at which switching regulator components
would be damaged.
The drawing illustrates a switching regulator in which a full-wave bridge
rectifier 10 is connected to an AC source through a current limiting resistor 12.
The voltage across the outputs of rectifier 10 is applied to a bulk capacitor 14
through a diode 16. An over-voltage sensing circuit 18 is connected in parallel
with capacitor 14. A transient-suppressing circuit, consisting of a resistor 20 and
an SCR 22, is connected directly across the outputs of the rectifier 10. The
control circuit for the transient-suppressing circuit includes a transistor 24 having
its base connected to the over-voltage sensing circuit 18. A bias resistor 26
provides a current path from the upper end of capacitor 14.
As long as the output or bulk voltage Vb is at or below a predetermined level,
transistor 24 remains on, grounding the gate of the SCR 22. Under normal
conditions, the total output of the rectifier circuit 10 is applied across capacitor 14.
If a line transient increases the voltage across capacitor 14 beyond the
predetermined level, over-voltage sensing circuit 18 drives transistor 24 off. Bias
current supplied through resistor 26 triggers SCR 22 into conduction. Resistors
12 and 20 act as a voltage divider to reduce the voltage at the output side of the
rectifier circuit. The diode 16 will be backbiased under these conditions since the
voltage across capacito...