# US 7,613,016 B2 · Power and information signal transfer using micro-transformers

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- Number: US 7,613,016 B2
- Document ID: US7613016B2
- Status: Granted
- Kind: B2
- Application number: 11/593,360
- Filed: 2006-11-06
- Published: 2008-04-24
- Granted: 2009-11-03
- Earliest claimed: 2004-08-20
- Assignees: Analog Devices, Inc.
- Inventors: Baoxing Chen; Ronn Kliger
- Web page: https://patentgrep.com/patent/US7613016B2

## CPC

- H02M 3/3374: {with preregulator, e.g. current injected push-pull}
- H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop}
- H02M 3/338: in a self-oscillating arrangement (H02M3/337 takes precedence)
- H10W 90/293: {characterised by non-galvanic coupling between the chips, e.g. capacitive coupling}
- H01F 17/0013: {with stacked layers}
- H01F 38/50: {Transformers for galvanic isolation}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A power converter provides power across an isolation barrier, such as through the use of coils. A coil driver has transistors connected in a positive feedback configuration and is coupled to a supply voltage in a controlled manner by measuring the output power and opening or closing a switch as needed between the power supply and the coil driver. An output circuit, such as a FET driver, can be used with or without isolation to provide power and a logic signal.

## Claims

### Claim 1

A power converter comprising:
a first micro-transformer for receiving an input signal at a first planar winding and for providing an isolated signal isolated from the received signal at a second planar winding;
a coil driver, including transistors connected in a positive feedback configuration, coupled to the first planar winding;
a switch for coupling a voltage to the coil driver;
an output terminal for supplying a regulated DC signal based on the isolated signal; and
a feedback circuit coupled to the output terminal and the switch, the feedback circuit including a second micro-transformer.

### Claim 2 (depends on 1)

The power converter of claim 1, wherein the coil driver controls the signal received at the first winding of the first micro-transformer.

### Claim 3 (depends on 2)

The power converter of claim 2, wherein the switch couples the voltage source to the coil driver.

### Claim 4

A circuit comprising:
a single micro-transformer having a primary winding and a secondary winding;
a coil driver, including transistors connected in a positive feedback configuration, coupled to the primary winding;
a switch coupling a voltage to the coil driver; and
a rectifier coupled to the secondary winding providing a DC output;
wherein the switch has a control port controlled by a logic information signal, the circuit providing power conversion and the logic signal through said single micro-transformer.

### Claim 5 (depends on 4)

The circuit of claim 4, wherein said primary winding and said secondary windings are planar windings.

### Claim 6

A circuit comprising:
a transformer having a primary winding and a secondary winding;
a coil driver, including transistors connected in a positive feedback configuration, coupled to the primary winding;
a switch coupling a voltage to the coil driver;
a rectifier coupled to the secondary winding providing a DC output; and
a driver coupled to a control port of the switch;
wherein the control part of the switch is controlled by a logic information signal, the circuit providing power conversion and the logic information signal through said transformer.

### Claim 7 (depends on 6)

The circuit of claim 6, wherein said transformer is a micro-transformer.

### Claim 8 (depends on 7)

The circuit of claim 7, wherein said primary winding and said secondary windings are planar windings.