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Voltage Regulator Incorporating Soft Start Control with Boost

IP.com Disclosure Number: IPCOM000077460D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Ernst, LM: AUTHOR [+3]

Abstract

A root-mean-square (RMS) regulator in which power supplied at the output is controlled by controlling the firing angle of the thyristor switching device in response to changes in a hybrid signal, which is indicative of the difference between the RMS value of the output voltage and the desired RMS value, incorporates an exponentially decaying current to provide a soft-start ability with boost.

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Voltage Regulator Incorporating Soft Start Control with Boost

A root-mean-square (RMS) regulator in which power supplied at the output is controlled by controlling the firing angle of the thyristor switching device in response to changes in a hybrid signal, which is indicative of the difference between the RMS value of the output voltage and the desired RMS value, incorporates an exponentially decaying current to provide a soft-start ability with boost.

The RMS regulator controls timing circuit 11, which in turn determines the time from the zero-crossing of the AC line voltage until a thyristor is fired. Firing of the thyristor enables that device to conduct current from a supply to a load. The regulator controls the firing angle of the thyristor to thereby maintain the RMS voltage across the load at a constant value. A current balance is constructed between a current proportional to the average load voltage, current I(F) and a standard current such that an imbalancing current results in the charging or discharging of capacitor 13. The voltage on capacitor 13 is the controlling parameter of the variable-timing circuit 11.

Current I(F) proportional to the rectified output load voltage is combined with current I(theta) proportional to the conduction angle of the thyristor. The combined difference current I(F)-I(theta) is compared with a constant current I(C) to consequently effect the charge on capacitor 13. Current I(E) has added thereto an exponentially decaying...