Systems and methods for transferring power across an isolation barrier
First Claim
1. A system for transferring power across an isolation barrier, the system comprising:
- a transformer having a primary winding on a first side of the isolation barrier and a secondary winding on a second side of the isolation barrier;
an oscillator coupled to the primary winding and configured to establish in the primary winding an oscillating power signal; and
a dither circuit coupled to the oscillator and configured to dither a parameter of the oscillating power signal.
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Accused Products
Abstract
It is often desirable to transmit data between circuits or components operating at a relatively high voltage and circuits operating at a relatively low voltage. Such a task can be performed by use of an isolator. Some isolator designs use magnetic coupling to transfer the data as this is more robust against inadvertently transmitting high voltage transients than capacitor based isolators. However it is often desirable to encode the data for exchange across the transformer of the isolator and decode after transmission across the transformer. This requires power for the encoding and decoding circuits. To ensure both sides are powered, power may be transferred by another transformer. The transformer primary is driven by an oscillating signal. The system disclosed in some embodiments herein varies the frequency of the oscillating signal to mitigate the risk of it interfering with other circuits or systems associated with the isolator.
10 Citations
20 Claims
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1. A system for transferring power across an isolation barrier, the system comprising:
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a transformer having a primary winding on a first side of the isolation barrier and a secondary winding on a second side of the isolation barrier; an oscillator coupled to the primary winding and configured to establish in the primary winding an oscillating power signal; and a dither circuit coupled to the oscillator and configured to dither a parameter of the oscillating power signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of transferring power across an isolation barrier, the method comprising:
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generating an oscillating power signal in a first side of the isolation barrier; transferring the oscillating power signal from the first side of the isolation barrier to a second side of the isolation barrier; and dithering the oscillating power signal to modify a spectral distribution of the oscillating power signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A system for transferring power across an isolation barrier, the system comprising:
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a transformer separating first and second sides of the isolation barrier, the transformer having a primary winding on the first side of the isolation barrier and a secondary winding on the second side of the isolation barrier; an oscillator on the first side of the isolation barrier configured to provide an oscillating power signal to the primary winding of the transformer; a power receiver on the second side of the isolation barrier coupled to the secondary winding of the transformer to receive the oscillating power signal; a control circuit coupled to the power receiver and configured to generate a pseudo random number or sequence; and an oscillator driver coupled to the control circuit and configured to drive the oscillator to establish the oscillating power signal based on the pseudo random number or sequence. - View Dependent Claims (18, 19, 20)
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Specification