Method and circuitry for controlling current reset characteristics of a magnetic amplifier control circuit

Patent 5612862 Issued on March 18, 1997. Estimated Expiration Date:

May 6, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Alcatel Network Systems, Inc.

Application

No. 238779 filed on 05/06/1994

US Classes:

363/93, With plural control windings323/266, Including pre or post regulation323/901, STARTING CIRCUITS363/21.1, Utilizing pulse-width modulation363/91Saturable reactor (e.g., magnetic amplifier)

Examiners

Primary: Wong, Peter S.
Assistant: Riley, Shawn

Attorney, Agent or Firm

Baker & Botts, L.L.P.

International Class

H02M 003/335

Abstract

Magnetic amplifier post regulator (54) includes magnetic amplifier (42) that has a main magnetic amplifier winding, reset transistor (76), error amplifier (58), and auxiliary magnetic amplifier winding (220). Magnetic amplifier (42) controllably blocks a portion of the input voltage Ns /Np VIN from winding (30) of transformer (18) in response to a controlled resetting condition and produces therefrom a magnetic amplifier output voltage (v2). Auxiliary output circuit (14) uses the magnetic amplifier (42) output voltage (v2) to produce the desired auxiliary output voltage (VOS). Reset transistor (76) controls reset current to magnetic amplifier (42) in response to an error signal from error amplifier (58). Error amplifier (58) compares auxiliary output voltage (VOS) to predetermined reference voltage (66) and generates the error signal from the comparison. Auxiliary magnetic amplifier winding (220) has a predetermined number of turns (N2) on magnetic amplifier (42) and increases the dynamic range of magnetic amplifier post regulator (54) for controlling reset transistor (76) and auxiliary output circuit (14) so that auxiliary output voltage (VOS) may attain a zero value while reset transistor (76) controls magnetic amplifier (42) in a blocking state (TB) during the entire on-time (TON) of power switch transistor (24) of primary circuit (16).