Method and apparatus for conveying bidirectional data, power and timing signals using a single transformer
First Claim
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1. A method for conveying bidirectional data over a transformer comprising the steps of:
- modulating an alternating current signal with outbound data;
driving a first side of the transformer with the modulated signal;
receiving the modulated signal from a second side of the transformer;
extracting outbound data from the received modulated signal using a comparator;
modulating according to inbound data the load presented to the second side of the transformer using a switch connected to ground when the alternating current signal is not modulated; and
receiving inbound data by sensing said load modulation.
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Abstract
Transformer driven by data modulated signal provides isolated power. Outbound data is extracted from the data modulated signal received from the transformer. Inbound data received in isolated circuitry modulates the load presented to transformer. Inbound data perceived in non-isolated circuitry by sensing load experienced by the transformer.
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Citations
20 Claims
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1. A method for conveying bidirectional data over a transformer comprising the steps of:
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modulating an alternating current signal with outbound data; driving a first side of the transformer with the modulated signal; receiving the modulated signal from a second side of the transformer; extracting outbound data from the received modulated signal using a comparator; modulating according to inbound data the load presented to the second side of the transformer using a switch connected to ground when the alternating current signal is not modulated; and receiving inbound data by sensing said load modulation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for conveying bidirectional data across a galvanic barrier comprising:
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a signal generator; a signal modulator for modulating with outbound data a signal produced by the signal generator; a transformer having a first side for receiving a modulated signal from the signal modulator and a second side; a data extractor for extracting outbound data from a modulated signal received from the second side of the transformer, the data extractor further comprising a comparator; a transformer load modulator for modulating the load on the second side of the transformer utilizing a switch configured to be coupled to ground, according to inbound data; and an inbound data recovery unit for determining inbound data by sensing load modulations induced by the transformer load modulator. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system-side isolation controller comprising:
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a signal generator; a signal modulator for modulating a signal produced by the signal generator, the signal modulator comprising an exclusive OR gate and an exclusive NOR gate; and an inbound data recovery unit for determining inbound data by sensing load modulations exhibited by a transformer, wherein the load modulations are generated using a switch coupled to ground. - View Dependent Claims (16)
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17. A line-side isolation controller comprising:
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a data extractor for extracting outbound data from a modulated signal received from a second side of a transformer, the data extractor comprising a comparator; and a transformer load modulator utilizing a switch coupled to ground for modulating the load presented to the second side of the transformer according to inbound data. - View Dependent Claims (18, 19, 20)
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Specification