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US 3,995,237 AGranted
Automatic matching method and apparatus
AssigneeCincinnati Electronics Corporation
InventorJohn E. Brunner
Life of this patent
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AssigneeCincinnati Electronics Corporation
InventorJohn E. Brunner
Estimating the term…
A high-Q load circuit is matched to a drive circuit with an L-type filter network including series and shunt reactances which are both either inductive or capacitive. While a first of the reactances is effectively removed from the network, the value of the second of the reactances is varied until the impedance magnitude of the load and network, as seen from the drive circuit, reaches a predetermined magnitude, and a predetermined relationship exists for the polarity of the phase of the voltage and current supplied by the drive circuit to the network. When the impedance magnitude seen by looking from the drive circuit into the network reaches the predetermined magnitude and the correct phase polarity exists, the first reactance is reconnected into the network and then varied until a predetermined relationship exists between the phase angle between the voltage and current applied by the drive circuit to the network.
A method of matching a load circuit to a drive circuit with a matching network connected between the circuits, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, said matching network including a series reactance and a shunt reactance, comprising:
A method of matching a load circuit to a drive circuit with a matching network connected between the circuits, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, said matching network including a series reactance and a shunt reactance, both of said reactances being of the same type, comprising varying the value of one of the reactances while the other reactance is effectively removed from the network until a detected impedance magnitude as seen from the drive circuit reaches a predetermined value regardless of the magnitude of the phase angle between the voltage and current supplied by the drive circuit to the load circuit when the predetermined impedance value is detected;
Apparatus for automatically matching a load circuit to a drive circuit, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, comprising a matching network connected between the circuits, said matching network including a series reactance and a shunt reactance, means for varying the value of one of the reactances so that a real component as seen from the drive circuit remains constant while the one reactance is varied, means for sensing the impedance magnitude seen from the drive circuit while the one reactance is varied, means responsive to the sensed impedance magnitude reaching a predetermined value and unresponsive to the magnitude of the phase angle between the voltage and current supplied by the drive circuit to the matching circuit for maintaining the value of the one reactance constant and for varying the value of the other reactance so that the inverse real component seen from the drive circuit remains constant while the other reactance is varied, means for sensing the phase angle between the voltage and current supplied by the drive circuit to the matching network while the other reactance is varied, and means responsive to the sensed phase angle having a predetermined magnitude for maintaining the value of the other reactance constant.
Apparatus for automatically matching a load circuit to a drive circuit, one of said circuits having a relatively high Q so that a real impedance component detector for the load circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, comprising a matching network connected between the circuits, said matching network including a series reactance and a shunt reactance, both of said reactances being of the same type, means for varying the value of one of the reactances, means for effectively removing the other reactance from the network while the one reactance is being varied, means for sensing the impedance magnitude seen from the drive circuit while the other reactance is removed, means responsive to the sensed impedance magnitude reaching a predetermined value and unresponsive to the magnitude of the phase angle between the voltage and current supplied by the drive circuit to the matching circuit for:
Apparatus for automatically matching a load circuit to a drive circuit, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, comprising a matching network connected between the circuits, said matching network including a series reactance and a shunt reactance, an impedance magnitude detector for the load circuit, means for detecting an inphase relationship for the voltage and current supplied by the drive circuit to the load circuit, a controller, said controller including:
Apparatus for automatically matching a load circuit to a drive circuit, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, comprising a matching network connected between the circuits, said matching network including a series reactance and a shunt reactance, means for varying the value of one of the reactances so that a real component as seen from the drive circuit remains constant while the one reactance is varied, means for sensing the impedance magnitude seen from the drive circuit while the one reactance is varied, means responsive to the sensed impedance magnitude reaching a predetermined value and unresponsive to the magnitude of the phase angle between the voltage and current supplied by the drive circuit to the matching circuit for maintaining the value of the one reactance constant and for varying the value of the other reactance so that the inverse real component seen from the drive circuit remains constant while the other reactance is varied, and means responsive to a change in the polarity of the phase angle between the voltage and current supplied by the drive circuit to the matching circuit while the other reactance is varied for preventing further variation of the values of the reactances until a new matching sequence is initiated.
Apparatus for automatically matching a load circuit to a drive circuit, one of said circuits having a relatively high Q so that a real impedance component detector for the one circuit is incapable of accurately determining the real component because the real component is much less than an imaginary component of the circuit being matched, comprising a matching network including a series reactance and a shunt reactance, both of said reactances being of the same type, means for varying the value of one of the reactances, means for effectively removing the other reactance from the network while the one reactance is being varied, means for sensing the impedance magnitude seen from the drive circuit while the other reactance is removed, means responsive to the sensed impedance magnitude reaching a predetermined value for:
Dependencies are inferred from the claim text.