Device for supplying power from an AC voltage

Patent metadata

Field	Value
Publication number	US-11916492-B2
Application number	US-202017596201-A
Country	US
Kind code	B2
Filing date	Jun 16, 2020
Priority date	Jun 17, 2019
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

The present description concerns a device for delivering a voltage from an AC voltage, comprising a capacitive element (120), two switches (132H, 132L) in a half-bridge between terminals of the capacitive element (120); terminals (102, 104) of application of the AC voltage; a transformer (160), comprising a first winding (162) coupling to a junction node (136) between the switches (132H, 132L) one of the terminals (104) of application of the AC voltage; and one or a plurality of circuits (170, 180, 140), configured to switch the switches (132H, 132L) and receive an AC current (I164) flowing through a second winding (164) of the transformer (160) and regulate the voltage delivered by the device by acting on a frequency of said AC current and/or on a phase shift of said AC current with respect to its reception.

First claim

What is claimed is:

1. A device for delivering a DC voltage between two output terminals from an AC voltage applied to first and second input terminals, comprising:
a first capacitive element;
two first switches in a half-bridge between terminals of the first capacitive element;
two second switches electrically coupled in series between the terminals of the first capacitive element;
a transformer, comprising a first winding placed between a junction node between the first switches and the first input terminals, the second input terminals being coupled to a junction node between the second switches;
a full wave rectifying circuit delivering the DC voltage, comprising:
two second capacitive elements electrically coupled in series between the two output terminals; and
two third switches, each placed between one of the output terminals and a second winding of the transformer;

a circuit configured to switch the first switches at a frequency and to control the second switches; and
a circuit configured to control the DC voltage delivered by the device, by acting on said frequency and/or on a delay between a time when an AC current flowing through the second winding changes direction and a next time of switching of the third switches.

2. A device according to claim 1 , comprising:
a voltage sensor delivering a value of the DC voltage; and
a circuit configured to act on said frequency and/or on said delay based on the value of the DC voltage.

3. A device according to claim 1 , comprising a circuit configured to, at each halfwave of the AC voltage, turn on a single one of the second switches during at least a central phase of the halfwave, said single one of the second switches being a function of a sign of the halfwave.

4. A device according claim 1 , comprising a circuit configured to regulate a mobile average of a current flowing through the first and second input terminals, according to a current set point, by acting on a duty factor of the switching of the first switches.

5. A device according to claim 4 , wherein the current set point has a value representative of a result of a multiplication of a conductance value by a value of the AC voltage.

6. A device according to claim 5 , comprising a circuit configured to regulate a value of a voltage of the first capacitive element by acting on said conductance value.

7. A device according to claim 6 , comprising, an additional capacitive element coupling a terminal of the first capacitive element to the first terminal of the input terminals.

8. A sevice according to claim 3 , comprising a circuit configured to block the second switches during phase of transition of phases between said central phases.

9. A device according to claim 8 , comprising a circuit configured to, at each transition phase, progressively vary a duty factor of the switching of the first switches, to obtain a predefined voltage value across the second switches that will be turned on during the central phase following the transition phase.

10. A device according to claim 9 , wherein the central phase following each transition phase starts at a time when the AC voltage has said predefined voltage value.

11. A device according to claim 9 , wherein the transition phase following each central phase starts at the time when the AC voltage has said predefined value.

12. A device according to claim 1 , comprising a circuit configured to obtain a zero voltage between the terminals of each of the first switches at a switching time of the first switches.

13. A device according to claim 1 , wherein the transformer has a coupling coefficient smaller than 1.

14. A device according to claim 1 , wherein the first switches are HEMT-type transistors.

15. A power supply device comprising a USB-C connector comprising the device according to claim 1 .

Assignees

• Commissariat A Ienergie Atomique Et Aux Energies Alternatives
• Commissariat Energie Atomique

Inventors

• Bailly Alain
• Bergogne Dominique
• Bouchet Thierry

Classifications

• H02M7/217 Primary

  using semiconductor devices only · CPC title

• H02M1/083

  for the ignition at the zero crossing of the voltage or the current · CPC title

• H02M3/158

  including plural semiconductor devices as final control devices for a single load · CPC title

• H02M7/53871 Primary

  with automatic control of output voltage or current · CPC title

• Y02B70/10

  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 · CPC title