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Phase Control Voltage Regulator for Use With Choke Input Filter

IP.com Disclosure Number: IPCOM000083923D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Johari, GC: AUTHOR

Abstract

Controlled rectifiers 2, 3, 4 connect the terminals 5 6 7 of a three-phase phase power supply to a direct-current load 8. The controlled rectifiers are gated on at a selected point in the alternating-current cycle to control the voltage of the load, as a representative gating signal line 9 shows. A filter for the load includes a choke 10.

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Phase Control Voltage Regulator for Use With Choke Input Filter

Controlled rectifiers 2, 3, 4 connect the terminals 5 6 7 of a three-phase phase power supply to a direct-current load 8. The controlled rectifiers are gated on at a selected point in the alternating-current cycle to control the voltage of the load, as a representative gating signal line 9 shows. A filter for the load includes a choke 10.

Except for the effect of choke 10, a controlled rectifier conducts from the time that it is turned on until the point in the alternating-current cycle, at which the voltage of the associated supply terminal falls below the load voltage. A controlled rectifier can be turned on as soon as the supply voltage for its phase rises above the load voltage. The turn on time is varied for voltage regulation.

There are intervals in the alternating-current cycle during which all phases of the supply voltage are below the load voltage. During these intervals, choke 10 acts as a source to supply current to the load. During some operating conditions, choke 10 conducts throughout these intervals and in other operating conditions the current in the choke falls to zero.

Since other elements of the filter maintain the load voltage when the choke current is zero, a controlled rectifier can not be turned on if its gating pulse is applied while the choke current is zero and the line voltage is below the load voltage. The circuit of the drawing supplies two gating signals, First Pulse and Second Pulse, to turn on a controlled rectifier und...