Isolated digital transmission with improved EMI immunity
First Claim
1. A circuit for transmitting data across an isolation barrier, comprising:
- a primary side,a secondary side, andan energy transfer device electrically isolating the primary side and the secondary side and including a primary coil,wherein the primary side comprises;
first and second energy storage devices,a control system coupled to the first energy storage device for power and configured to receive a data signal,at least one charge switch selectively coupling a power source to the second energy storage device, andat least one dumping switch selectively coupling the second energy storage device to the primary coil,wherein the control system is configured to control the at least one charge switch and the at least one dumping switch such that energy is selectively transmitted from the second energy storage device to the secondary side that corresponds to the data signal.
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Accused Products
Abstract
Embodiments of the present invention may provide a circuit. The circuit may include a primary side, a secondary side, and an isolated energy transfer device electrically isolating the primary side and the secondary side. The primary side may include a first energy storage device coupled to a power source, a control system coupled to the first energy storage device for power, a second energy storage device, and a coupling system, coupled to the control system, to selectively couple the second energy storage device to the power source in a first phase and to selectively couple the second energy storage device to the primary side of the isolated energy transfer device during a second phase.
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Citations
22 Claims
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1. A circuit for transmitting data across an isolation barrier, comprising:
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a primary side, a secondary side, and an energy transfer device electrically isolating the primary side and the secondary side and including a primary coil, wherein the primary side comprises; first and second energy storage devices, a control system coupled to the first energy storage device for power and configured to receive a data signal, at least one charge switch selectively coupling a power source to the second energy storage device, and at least one dumping switch selectively coupling the second energy storage device to the primary coil, wherein the control system is configured to control the at least one charge switch and the at least one dumping switch such that energy is selectively transmitted from the second energy storage device to the secondary side that corresponds to the data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17, 18)
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10. A method for transmitting data across an isolation barrier, comprising:
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coupling a first energy storage device to a power source; supplying power to a control system using the first energy storage device; providing a data signal to the control system; and responsive to at least one control signal generated by the control system, selectively coupling a second energy storage device to the power source via at least one charge switch and selectively coupling the second energy storage device to a primary coil of an electrically isolating energy transfer device via at least one dumping switch so as to transmit energy from the second energy storage device to a secondary side of the electrically isolating energy transfer device that corresponds to the data signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 19)
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20. A circuit for transmitting data across an isolation barrier, comprising:
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an electrically isolating energy transfer device separating a primary side and a secondary side and including a primary coil, the primary side including; a first means for coupling a first energy storage device to a power source; a second means for supplying power to a control system using the first energy storage device, the control system being configured to receive a data signal; a third means for selectively coupling a second energy storage device to the power source, and a fourth means for selectively coupling the second energy storage device to the primary coil of the electrically isolating energy transfer device wherein the control system is configured to control the third and fourth means such that energy is selectively transmitted from the second energy storage device to the secondary side that corresponds to the data signal. - View Dependent Claims (21, 22)
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Specification