Power oscillator apparatus with transformer-based power combining for galvanically-isolated bidirectional data communication and power transfer

• US 9,306,614 B2
• Filed: 02/25/2015
• Issued: 04/05/2016
• Est. Priority Date: 03/26/2013
• Status: Active Grant

• Current Assignee: STMicroelectronics International N.V. (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SRL (STMicroelectronics NV)
• Inventors: Ragonese, Egidio, Fiore, Vincenzo, Spina, Nunzio, Palmisano, Giuseppe, Lombardo, Pierpaolo
• Primary Examiner(s): Vlahos, Sophia
• Application Number:
  US14/631,397
• Publication Number:
  US 20150180528A1
• Time in Patent Office: 405 Days
• US Class Current: 1/1
• CPC Class Codes: G08C 19/02 in which the signal transmitted is magnitude of current or voltage G08C19/36, G08C19/38 take precedence
• CPC Class Codes: G08C 19/16 in which transmission is by pulses
• CPC Class Codes: H02M 3/33592 having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
• CPC Class Codes: H02M 3/338 in a self-oscillating arrangement H02M3/337 takes precedence
• CPC Class Codes: H03B 2200/0074 Locking of an oscillator by injecting an input signal directly into the oscillator
• CPC Class Codes: H03B 5/1212 the amplifier comprising a pair of transistors, wherein an output terminal of each being connected to an input terminal of the other, e.g. a cross coupled pair
• CPC Class Codes: H03B 5/1228 the amplifier comprising one or more field effect transistors
• CPC Class Codes: H03B 5/1296 the feedback circuit comprising a transformer
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 3/54 Systems for transmission via power distribution lines
• CPC Class Codes: H04L 27/08 Amplitude regulation arrangements
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An apparatus includes first and second oscillator circuits. A transformer has a primary winding coupling the first oscillator circuit to the second oscillator circuit and a secondary winding. A first outgoing communications circuit is coupled to the second oscillator circuit and drives an amplitude modulated data signal thereto. A first incoming communications circuit is coupled to the primary winding of the transformer. A second outgoing communications circuit is coupled to the secondary winding drives an amplitude modulated data signal thereto. A second incoming communications circuit is coupled to the secondary winding. The secondary winding is magnetically coupled with the primary winding so the secondary winding receives an output power and an incoming data transmission based upon the amplitude modulated data signal, and so the primary winding receives an incoming high speed data transmission based upon the amplitude modulated data signal.

Claims

1. An apparatus, comprising:

a first oscillator circuit;

a second oscillator circuit;

a transformer having;

a primary winding coupling the first oscillator circuit to the second oscillator circuit, and

a secondary winding;

an outgoing communications circuit coupled to the second oscillator circuit and configured to drive an amplitude modulated data signal thereto;

an incoming communications circuit coupled to the secondary winding;

the secondary winding being magnetically coupled with the primary winding such that;

the secondary winding receives an output power and an incoming data transmission based upon the amplitude modulated data signal.

2. The apparatus of claim 1, wherein the primary winding comprises:

a first winding portion coupled to the first oscillator circuit;

a second winding portion coupled to the second oscillator circuit; and

a center tap common to the first and second winding portions and configured to conduct current from the first oscillator into the second oscillator;

wherein the outgoing communications circuit is coupled to the second winding portion of the primary winding; and

wherein the incoming communications circuit is coupled to the second winding portion of the primary winding.

3. The apparatus of claim 1, wherein the outgoing communications circuit comprises:

an encoder configured to receive a clock signal and a bitstream, and to generate a data signal based thereupon; and

a modulator coupled to the encoder and the second oscillator circuit and configured to receive the data signal from the encoder and to drive a modulated data signal based thereupon to the second oscillator circuit.

4. The apparatus of claim 3, further comprising a divider coupled to the primary winding and configured to extract therefrom a reference frequency;

and wherein the clock signal is based upon the reference frequency.

5. The apparatus of claim 1, further comprising:

a demodulator coupled to the secondary winding and configured to receive the amplitude modulated data signal therefrom and to demodulate the amplitude modulated data signal to produce a received data signal;

a decoder coupled to the demodulator and configured to receive the received data signal and to decode the received data signal.

6. The apparatus of claim 1, wherein the first and the second oscillator circuits are configured to receive a synchronizing signal for synchronization of frequency and phase between the first and second oscillator circuits.

7. The apparatus of claim 1, wherein the incoming communications circuit comprises:

a demodulator coupled to the secondary winding and configured to receive the amplitude modulated data signal therefrom and to demodulate the amplitude modulated data signal to produce a received data signal; and

a decoder coupled to the demodulator and configured to receive the received data signal and to decode the received low speed data signal.

8. The apparatus of claim 7, wherein the first and the second oscillator circuits are configured to receive a synchronizing signal for synchronization of frequency and phase between the first and second oscillator circuits.

9. An apparatus, comprising:

a first oscillator circuit;

a second oscillator circuit;

a transformer having;

a primary winding coupling the first oscillator circuit to the second oscillator circuit, and

a secondary winding;

an incoming communications circuit coupled to the primary winding of the transformer;

an outgoing communications circuit coupled to the secondary winding and configured to drive an amplitude modulated data signal thereto; and

the secondary winding being magnetically coupled with the primary winding such that;

the secondary winding receives an output power, and

the primary winding receives an incoming data transmission based upon the amplitude modulated data signal.

10. The apparatus of claim 9, wherein the primary winding comprises:

a first winding portion coupled to the first oscillator circuit;

second winding portion coupled to the second oscillator circuit; and

a center tap common to the first and second winding portions and configured to conduct current from the first oscillator into the second oscillator;

wherein the outgoing communications circuit is coupled to the second winding portion of the primary winding; and

wherein the incoming communications circuit is coupled to the second winding portion of the primary winding.

11. The apparatus of claim 9, wherein the incoming communications circuit comprises:

a demodulator coupled to the primary winding and configured to receive the amplitude modulated data signal therefrom and to demodulate the amplitude modulated data signal to produce a received data signal; and

a decoder coupled to the demodulator to receive the received data signal therefrom and to decode the received data signal.

12. The apparatus of claim 9, wherein the outgoing communications circuit comprises:

an encoder configured to receive a clock signal and a bitstream, and to generate a data signal based thereupon; and

a modulator coupled to the encoder and the secondary winding and configured to receive the data signal from the encoder and to drive a modulated data signal based thereupon to the secondary winding.

13. The apparatus of claim 12, further comprising a divider coupled to the secondary winding and configured to extract therefrom a reference frequency;

and wherein the clock signal is based upon the reference frequency.

14. An apparatus, comprising:

a first oscillator circuit;

a second oscillator circuit;

a transformer having;

a primary winding coupling the first oscillator circuit to the second oscillator circuit, and

a secondary winding magnetically coupled with the primary winding;

a first outgoing communications circuit coupled to the second oscillator circuit;

a first incoming communications circuit coupled to the primary winding of the transformer;

a second outgoing communications circuit coupled to the secondary winding; and

a second incoming communications circuit coupled to the secondary winding;

wherein the primary winding comprises;

a first winding portion coupled to the first oscillator circuit;

a second winding portion coupled to the second oscillator circuit; and

a center tap common to the first and second winding portions;

wherein the first outgoing communications circuit is coupled to the second winding portion of the primary winding; and

wherein the first incoming communications circuit is coupled to the second winding portion of the primary winding.

15. The apparatus of claim 14, wherein the first outgoing communications circuit comprises:

an encoder; and

a modulator coupled to the encoder and the second oscillator circuit.

16. The apparatus of claim 14, wherein the first incoming communications circuit comprises:

a demodulator coupled to the primary winding; and

a decoder coupled to the demodulator.

17. The apparatus of claim 14, wherein the second outgoing communications circuit comprises:

an encoder; and

a modulator coupled to the encoder and the secondary winding.

18. The apparatus of claim 14, wherein the second incoming communications circuit comprises:

a demodulator coupled to the secondary winding; and

a decoder coupled to the demodulator.

19. An apparatus, comprising:

a transformer having a primary winding and a secondary winding;

a first interface;

a first outgoing communications circuit comprising;

a first encoder coupled to the first interface to receive therefrom a bitstream and a clock signal, and to generate therefrom a data signal, and

a first modulator coupled to the first encoder to receive therefrom the data signal and coupled to the primary winding and configured to modulate the data signal into a modulated data signal to be driven to the primary winding;

a first incoming communications circuit comprising;

a first demodulator coupled to the primary winding to receive therefrom an amplitude modulated data signal and configured to demodulate the amplitude modulated data signal to produce a received data signal, and

a first decoder coupled to the first demodulator to receive therefrom the received data signal, and configured to decode the received data signal and to pass a decoded data signal to the first interface;

a second interface;

a second outgoing communications circuit comprising;

a second encoder coupled to the second interface to receive therefrom a bitstream and a clock signal and configured to generate therefrom a data signal, and

a second modulator coupled to the second encoder to receive therefrom the data signal and coupled to the secondary winding and configured to modulate the data signal into a modulated data signal to be driven to the secondary winding;

a second incoming communications circuit comprising;

a second demodulator coupled to the secondary winding to receive therefrom an amplitude modulated data signal and configured to demodulate the amplitude modulated data signal to produce a received data signal, and

a second decoder coupled to the second demodulator to receive therefrom the received data signal and configured to decode the received data signal into a decoded data signal to be passed to the second interface; and

a DC/AC converter coupled to the primary winding of the transformer and configured to transfer power to the primary winding of the transformer.