System for Preventing Transformer Saturation
OwnerOrris Dent, Gregory Wiegandinventors
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Abstract
System and method for managing a cumulative DC offset in a magnetizable material. A primary driving AC voltage and a magnetic flux sensor. The flux sensor output is continuously received into memory while the flux sensor output for each phase half-cycle is processed to continuously compute and re-compute in real time a flux-second integral for each half-cycle. The two half-cycle flux-second integrals are compared to each other for a DC offset value and the offset value drives a slow loop DC compensation circuit to steer a PWM control.
Claims11
A method for preventing magnetic flux saturation in a magnetizable material comprising therewithin a magnetic flux sensor transmitting magnetic flux density values, where the magnetic flux is induced by a primary driving voltage having opposite and alternating current phase half-cycles, the method comprising the steps of:
- a microprocessor continuously receiving the transmitted magnetic flux density values;
- the microprocessor comparing in real time during each driving voltage half-cycle each transmitted magnetic flux density value with a selectable and programmatically stored maximum flux density value, and
- the microprocessor triggering a reduction of the driving voltage to a voltage value greater than zero for the remainder of the half-cycle when the selectable maximum flux density value is reached in the half cycle.
A system for managing a cumulative DC offset in a magnetizable material comprising therewithin a magnetic flux sensor transmitting magnetic flux density values, where the magnetic flux is induced by a primary driving voltage having opposite and alternating current phase half-cycles, the system comprising:
- a microprocessor operatively associated with a machine readable memory and a set of instructions stored in the machine readable memory;
- the machine readable memory continuously receiving the transmitted magnetic flux density values;
- the microprocessor programed to process, in accordance with the set of instructions, the flux sensor output for each phase half-cycle to continuously compute and re-compute in real time an updated flux-second integral for each half-cycle;
- the microprocessor programed to compute, from the updated flux-second integral for each half-cycle, an instantaneous DC offset value;
- and
- the DC offset value driving a slow loop DC compensation circuit to steer a PWM control to vary the primary driving voltage in such a way as to add a DC voltage to the phase half-cycle that is deficient and or to subtract a DC voltage from the phase half-cycle that is contributing to the DC offset.
Dependencies are inferred from the claim text.