Polarity sensitive solid state relay
First Claim
1. A solid state polarity sensitive relay comprising in combination:
- (a) A bi-stable ferromagnetic switching module having a sensing coil for providing an output pulse in response to a flux reversal;
(b) means for producing a steady state magnetic field for biasing said module with a predetermined flux field;
(c) a first coil wound on said module for providing a flux with a first orientation in said module in response to a current in said first coil;
(d) a second coil wound on said module for providing a flux in said module in response to a current in said second coil; and
(e) a square wave control signal coupled to said first coil for effecting flux reversals in said module when a current within a predetermined range flows in said second coil;
whereby(f) with a current of a first direction in said second coil, said steady state magnetic field is aided while with a current, of a second direction opposite to said first direction, in said second coil said steady state magnetic field is opposed.
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Accused Products
Abstract
A polarity sensitive relay fabricated of and controlled by, solid state components is provided to produce a more trouble-free and smaller device. The relay may be made in first and second versions, the first of which responds to input signals of a single polarity and the second of which produces first and second output signals in response to input signals of first and second polarities, respectively. The relays include first or second Wiegand modules each of which has a drive coil, an input signal coil and an output signal winding. The Wiegand modules are placed in a steady state magnetic bias and the drive coils pulsed at a predetermined frequency. When two modules are used, the input signal coils are connected in series and in a manner to produce opposite magnetic effects on their associated Wiegand modules. One or the other of the output signal windings will produce a stream of pulses, at the frequency at which the drive coils are driven, in response to a signal of one or the other polarity in the input signal windings. An appropriate magnetic shield is provided to prevent magnetic interference to or from nearby components. A disclosed embodiment is designed to be fail safe meaning that a component failure will not result in an output signal. The relays will not respond to an input signal below a predetermined magnitude.
14 Citations
27 Claims
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1. A solid state polarity sensitive relay comprising in combination:
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(a) A bi-stable ferromagnetic switching module having a sensing coil for providing an output pulse in response to a flux reversal; (b) means for producing a steady state magnetic field for biasing said module with a predetermined flux field; (c) a first coil wound on said module for providing a flux with a first orientation in said module in response to a current in said first coil; (d) a second coil wound on said module for providing a flux in said module in response to a current in said second coil; and (e) a square wave control signal coupled to said first coil for effecting flux reversals in said module when a current within a predetermined range flows in said second coil;
whereby(f) with a current of a first direction in said second coil, said steady state magnetic field is aided while with a current, of a second direction opposite to said first direction, in said second coil said steady state magnetic field is opposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A solid state polarity sensitive relay comprising in combination:
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(a) first and second bi-stable ferromagnetic switching modules each having a sensing coil for providing output pulses in response to flux reversals; (b) means for producing a steady state magnetic field for biasing said first and second modules with a predetermined flux field; (c) a first coil wound on each of said first and second modules for providing a flux with like orientation in each of said first and second modules in response to a current in said first coils; (d) a second coil wound on each of said first and second modules for providing a flux with opposite orientations in each of said first and second modules in response to a current in said second coils; and (e) a square wave control signal coupled to said first coils for effecting flux reversals in one of said first and second modules when a current within a predetermined range flows in said second coils;
whereby(f) with a current of a first direction in said second coils, said steady state magnetic field is aided and opposed in said first and second modules, respectively, while with a current, of a second direction opposite to said first direction, in said second coils said steady state magnetic field is opposed and aided in said first and second modules, respectively. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification