Electronic filter
First Claim
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1. An active electrical current filter comprising:
- an N-channel FET controller coupled in series along a positive electrical line between an electrical power input and an electrical power output having voltages within a given range;
apparatus for providing a driving voltage to the FET controller, said driving voltage being in excess of the voltages within said given range; and
a differential voltage sensor, which senses the difference between the voltages at the filter input and output and whose output governs the driving voltage supplied to the FET controller,said active electrical filter exhibiting a voltage drop of less than one volt.
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Abstract
This invention discloses an active electrical current filter including an N-channel FET controller coupled in series along a positive electrical line between an electrical power input and an electrical power output having voltages within a given range, apparatus for providing a driving voltage to the FET controller, the driving voltage being in excess of the voltages within said given range, and a differential voltage sensor, which senses the difference between the voltages at the filter input and output and whose output governs the driving voltage supplied to the FET controller, the active electrical filter exhibiting a voltage drop of less than one volt.
38 Citations
29 Claims
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1. An active electrical current filter comprising:
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an N-channel FET controller coupled in series along a positive electrical line between an electrical power input and an electrical power output having voltages within a given range; apparatus for providing a driving voltage to the FET controller, said driving voltage being in excess of the voltages within said given range; and a differential voltage sensor, which senses the difference between the voltages at the filter input and output and whose output governs the driving voltage supplied to the FET controller, said active electrical filter exhibiting a voltage drop of less than one volt. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 25, 26, 29)
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6. An active current filter comprising:
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a FET controller coupled in series between an electrical power input and an electrical power output having voltages within a given range; apparatus for providing a driving voltage to the FET controller, said driving voltage being in excess of the voltages within said given range; and a sensor whose output governs the driving voltage supplied to the FET controller. - View Dependent Claims (12, 18, 24, 27)
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28. An active AC electrical current filter comprising:
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an AC rectifying bridge arranged in series on an AC line and having positive and negative electrical line outputs carrying voltages within a given range; an N-channel FET controller coupled in series across said positive and negative electrical line outputs; apparatus for providing a driving voltage to the FET controller, said driving voltage being in excess of the voltages within said given range; and a differential voltage sensor, which senses the difference between the voltages at the filter input and output and whose output governs the driving voltage supplied to the FET controller.
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Specification