# US 2008/0186748 A1 · Aid for the switching of a switched-mode converter

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- Number: US 2008/0186748 A1
- Document ID: US20080186748A1
- Status: Published application
- Kind: A1
- Application number: 12/023,333
- Filed: 2008-01-31
- Published: 2008-08-07
- Earliest claimed: 2007-02-02
- Assignees: STMicroelectronics S.r.l.
- Inventors: Francis Cuellar; Bertrand Rivet
- Web page: https://patentgrep.com/patent/US20080186748A1

## CPC

- H02M 1/34: Snubber circuits
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 1/346: {Passive non-dissipative snubbers}
- 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
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A switched-mode power converter, including, between a first end of a main inductive element and a switch, a two-value inductive element automatically switching between its two values.

## Claims

### Claim 1

A switched-mode power converter, comprising, between a first end of a main inductive element and a switch, a two-value inductive element automatically switching between its two values.

### Claim 2 (depends on 1)

The converter of claim 1, wherein the two-value inductive element comprises two elements in series having their junction point connected, by a first diode, to a terminal of application of an input voltage.

### Claim 3 (depends on 1)

The converter of claim 1, wherein the two-value inductive element comprises two elements in series having their junction point connected, by a first diode, to a terminal for providing an output voltage.

### Claim 4 (depends on 1)

The converter of claim 1, wherein the two-value inductive element is an inductance with a midpoint.

### Claim 5 (depends on 1)

The converter of claim 1, wherein the main inductive element forms a main winding of a magnetic circuit having two secondary windings electrically in series with their junction point connected to said first end of the main inductive winding.

### Claim 6 (depends on 5)

The converter of claim 5, wherein each secondary winding is in series with a diode other than the first diode.

### Claim 7 (depends on 5)

The converter of claim 5, wherein the secondary windings take part in a discharge of the two-value inductive element on turning-off and on turning-on of the switch, one of these taking part in the transfer of the power corresponding to the turning-on to said main winding.