Method of transmitting power and data across a galvanic isolation barrier, corresponding system and apparatus
First Claim
1. A method of transmitting power and data via a transformer including a primary side and a secondary side, wherein a primary side signal at the primary side of the transformer generates a secondary side signal at the secondary side of the transformer, the method including:
- producing the primary side signal at the primary side of the transformer by coupling a first oscillator signal modulated with a data signal for transmission to the secondary side of the transformer with a second oscillator signal selectively switched on and off to control power supply transmission to the secondary side of the transformer, wherein the first oscillation signal is applied to the primary side of the transformer both when the second oscillator signal is switched on and when the second oscillator signal is switched off, andwith respect to the secondary side signal generated at the secondary side of the transformer performing;
i) demodulation to recover at the secondary side of the transformer said data signal modulating said first oscillator signal, andii) rectification to recover at the secondary side of the transformer a power supply controlled by said switching on and off said second oscillator.
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Accused Products
Abstract
Power and data are transmitted via a transformer including primary side and secondary side. A primary side signal is generated by coupling a first oscillator signal modulated with a data signal with a second oscillator signal that is selectively switched on and off. At the secondary side a secondary signal is generated. A demodulator demodulates the secondary signal to recover the data signal. A rectifier processes the secondary signal to recover a power supply signal controlled by switching on and off the second oscillator.
44 Citations
14 Claims
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1. A method of transmitting power and data via a transformer including a primary side and a secondary side, wherein a primary side signal at the primary side of the transformer generates a secondary side signal at the secondary side of the transformer, the method including:
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producing the primary side signal at the primary side of the transformer by coupling a first oscillator signal modulated with a data signal for transmission to the secondary side of the transformer with a second oscillator signal selectively switched on and off to control power supply transmission to the secondary side of the transformer, wherein the first oscillation signal is applied to the primary side of the transformer both when the second oscillator signal is switched on and when the second oscillator signal is switched off, and with respect to the secondary side signal generated at the secondary side of the transformer performing; i) demodulation to recover at the secondary side of the transformer said data signal modulating said first oscillator signal, and ii) rectification to recover at the secondary side of the transformer a power supply controlled by said switching on and off said second oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for transmitting power and data via a transformer including a primary side and a secondary side, wherein a primary side signal at the primary side of the transformer generates a secondary side signal at the secondary side of the transformer, the system including:
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mutually coupled first and second oscillators at the primary side of the transformer, wherein the first oscillator is connected to a first winding of the primary side, said first winding having a center tap connected to receive a power supply voltage, and wherein the second oscillator is connected to a second winding of the primary side, said second winding having a center tap connected to receive said power supply voltage; wherein the first oscillator is coupled to a modulator to produce a first oscillator signal modulated with a data signal for transmission to the secondary side of the transformer; wherein the second oscillator is selectively switchable on and off to control power supply transmission to the secondary side of the transformer; and a demodulator and a rectifier configured to receive a secondary side signal generated at the secondary side of the transformer; wherein the demodulator is configured to recover at the secondary side of the transformer said data signal modulating said first oscillator signal; and wherein the rectifier is configured to recovering at the secondary side of the transformer a power supply controlled by said switching on and off said second oscillator. - View Dependent Claims (10, 11, 12)
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13. A circuit, comprising:
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a gate driver configured to drive a gate of a transistor; and a galvanic input-output isolation circuit coupled to an input of the gate driver, said galvanic input-output isolation circuit comprising; a transformer including a primary side and a secondary side; mutually coupled first and second oscillators at the primary side of the transformer, wherein the first oscillator is connected to a first winding of the primary side, said first winding having a center tap connected to receive a power supply voltage, and wherein the second oscillator is connected to a second winding of the primary side, said second winding having a center tap connected to receive said power supply voltage; wherein the first oscillator is coupled to a modulator to produce a first oscillator signal modulated with a data signal for transmission to the secondary side of the transformer; wherein the second oscillator is selectively switchable on and off to control power supply transmission to the secondary side of the transformer; a demodulator configured to receive a secondary side signal generated at the secondary side of the transformer and recover at the secondary side of the transformer said data signal modulating said first oscillator signal for application to the input of the gate driver; and a rectifier configured to receive the secondary side signal generated at the secondary side of the transformer and recover at the secondary side of the transformer a power supply signal controlled by said switching on and off said second oscillator for application to a power supply input of the gate driver. - View Dependent Claims (14)
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Specification