Signal isolators using micro-transformers
First Claim
1. A logic signal isolator comprising:
- a transformer having a primary winding and a secondary winding;
a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a signal of a first predetermined type is supplied to the primary winding and in response to a second type of edge in the logic signal, a signal of a second predetermined type is supplied to said primary winding, the primary winding and the transmitter being referenced to a first ground; and
the secondary winding being referenced to a second ground which is galvanically isolated from the first ground and said secondary winding supplying to a receiver circuit signals received in correspondence to the signals provided to the primary winding, the receiver reconstructing the received logic signal from the received signals.
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Abstract
A logic signal isolator comprising a transformer having a primary winding and a secondary winding; a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a signal of a first predetermined type is supplied to the primary winding and in response to a second type of edge in the logic signal, a signal of a second predetermined type is supplied to said primary winding, the primary winding and the transmitter being referenced to a first ground; and the secondary winding being referenced to a second ground which is galvanically isolated from the first ground and said secondary winding supplying to a receiver circuit signals received in correspondence to the signals provided to the primary winding, the receiver reconstructing the received logic signal from the received signals.
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Citations
11 Claims
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1. A logic signal isolator comprising:
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a transformer having a primary winding and a secondary winding; a transmitter circuit which drives said primary winding in response to a received logic signal, such that in response to a first type of edge in the logic signal, a signal of a first predetermined type is supplied to the primary winding and in response to a second type of edge in the logic signal, a signal of a second predetermined type is supplied to said primary winding, the primary winding and the transmitter being referenced to a first ground; and the secondary winding being referenced to a second ground which is galvanically isolated from the first ground and said secondary winding supplying to a receiver circuit signals received in correspondence to the signals provided to the primary winding, the receiver reconstructing the received logic signal from the received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A digital logic isolator, comprising:
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a. a transformer having a primary winding referenced to a first ground and a secondary winding referenced to a second ground isolated from the first ground; b. means for providing to the primary winding signals of a first type in response to transitions of a first type in an input logic signal; c. means for providing to the primary winding signals of a second type different from the signals of the first type in response to transitions of a second type in the input logic signal; and d. means for receiving from the secondary winding signals corresponding to the signals of the first and second types and for reconstituting the input logic signal from them.
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Specification