Switched-voltage control of the magnetization of current...

Details Switched-voltage control of the magnetization of current... Switched-voltage control of the magnetization of current...

2007-07-10

2007-07-10

Owens, Douglas W. (Department: 2821)

Electric lamp and discharge devices: systems

Electric switch in the supply circuit

C361S143000, C323S357000

Reexamination Certificate

active

11351080

ABSTRACT:
The magnetic flux of a magnetic body is controlled with voltage pulses from an active voltage source. The voltage pulses are applied to a winding circuit which is magnetically coupled to the magnetic body. An electronic switch means is used to generate the voltage pulses from a d-c power supply. A control circuit receives information about the winding current, and utilizes known loop impedances to optimize the voltage pulses for optimal magnetic control. Utilizing voltage pulses rather than a continuously variable voltage source has the advantage of lower cost and improved energy efficiency for many applications. The invention may be utilized for measurement of a-c current and d-c current utilizing ordinary current transformers. The switched-voltage control that is disclosed also may be used to facilitate accurate measurement of a-c current in a self-powered manner, with the power supply for the electronics deriving its power from the current transformer secondary circuit.

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