Electronic system comprising a standby mode without electrical consumption

Patent metadata

Field	Value
Publication number	US-9819198-B2
Application number	US-201314383372-A
Country	US
Kind code	B2
Filing date	Mar 7, 2013
Priority date	Mar 7, 2012
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

This invention relates to an electronic system including a radiative electromagnetic emitter for emitting an activation signal including sequentially an energy supply signal followed by an identification signal, the power of the energy supply signal being at least ten times greater than the power of the identification signal, further including an interface connected to an energy supply source; an electric load; a circuit for deactivating a placing of electric load on standby, including: a receiver including a reception interface, a rectifier configured to generate a DC activation voltage on the basis of an activation signal, a switch configured to selectively connect/disconnect to the load from the energy supply, an identification circuit configured to extract an identifier of the activation signal and configured to apply the activation voltage as closure control signal for turning off the switch if a match of the identifier is determined.

First claim

The invention claimed is:

1. An electronic system ( 1 ), said system comprising:
a radiative electromagnetic emitter ( 2 ) configured for selectively emitting an activation signal in the UHF frequency band, the activation signal including in series a power supply signal followed by an identification signal, the power of the power supply signal being at least ten times greater than the power of the identification signal;
an interface for connecting to an electrical power supply source ( 6 );
an electrical load ( 71 ) intended to be powered by the power supply source;
a circuit ( 5 ) for deactivating placing of the electrical load on standby, including:
a receiver ( 3 ) comprising:
a reception interface;
a rectifier connected to the reception interface and configured for generating a direct-current activation voltage from an activation signal received at the reception interface;

an activation switch ( 4 ) configured for selectively connecting/disconnecting the load ( 71 ) of the power supply as a function of a state of a control signal;
an identification circuit configured for extracting an identifier from the activation signal and determining an agreement between an extracted identifier and an identifier stored in a memory, and configured for applying the activation voltage as a signal controlling closing of the activation switch ( 4 ) if an agreement is determined.

2. The system as claimed in claim 1 , wherein the rectifier ( 31 ) includes a rectifier circuit ( 311 ) and a device ( 312 ) for storing an electrical charge connected to an output of the rectifier circuit ( 311 ).

3. The system as claimed in claim 2 , wherein the rectifier ( 31 ) includes a step-up direct-current/direct-current voltage converter ( 313 ), having an input connected to the storage device ( 312 ) and connected to the output of the rectifier circuit ( 311 ), and having an output supplying the activation voltage.

4. The system as claimed in claim 1 , including a switch ( 420 ) for holding activation connected in parallel with said activation switch ( 421 ), and furthermore including a control circuit ( 72 ) holding a holding switch ( 420 ) closed when the electrical load ( 71 ) is connected to the connection interface.

5. The system as claimed in claim 1 , wherein the activation switch is a first MOS transistor ( 421 ) whose source is connected to the connection interface and whose drain is connected to the load ( 71 ), the system furthermore comprising a second MOS transistor ( 422 ) whose gate receives the activation voltage, whose source is connected to a device ( 423 ) for storing an electrical charge and whose drain is connected to the gate of the first MOS transistor.

6. The system as claimed in claim 5 , wherein the first MOS transistor has a maximum applicable drain-source voltage at least equal to 500V.

7. The system as claimed in claim 1 , wherein the reception interface ( 30 ) comprises a first antenna ( 301 ) connected to the rectifier ( 311 ) and a second antenna ( 302 ) connected to the identification circuit ( 32 ).

8. The system as claimed in claim 1 , wherein the reception interface ( 30 ) comprises an antenna ( 301 ) connected to the rectifier ( 311 ) and to the identification circuit ( 32 ).

9. The system as claimed in claim 1 , wherein the activation switch ( 421 ) has a leakage current of less than 1 mW.

10. The system as claimed in claim 1 , wherein a duty cycle of the power supply signal (Pa) in the activation signal emitted by the electromagnetic emitter ( 2 ) is at least equal to 95%.

11. The system as claimed in claim 1 , wherein duration of the activation signal emitted by the electromagnetic emitter ( 2 ) is less than or equal to 100 ms.

12. The system as claimed in claim 1 , wherein the power of the power supply signal of the activation signal emitted by the electromagnetic emitter ( 2 ) is at least equal to 0.5 W.

13. The system as claimed in claim 1 , wherein the identification circuit ( 32 ) includes:
a demodulator ( 321 ) configured for demodulating the identification signal and extracting the extracted identifier;
a memory ( 323 ) storing the stored identifier;
a processing circuit ( 322 ) comparing the extracted identifier with the identifier stored in the memory.

14. The system as claimed in claim 1 , wherein the rectifier ( 31 ) applies the activation voltage generated as power supply voltage of the identification circuit ( 32 ).

Assignees

• Lyon Ecole Centrale
• Université Lyon 1 Claude Bernard
• Institut Nat Des Sciences Appliquées De Lyon
• Université De Limoges
• Centre Nat Rech Scient
• Univ Lyon 1 Claude Bernard
• Institut Nat Des Sciences Appiquees De Lyon
• Univ Limoges
• Centre Nat De La Recherch

Inventors

• Vollaire Christian
• Thevenot Marc
• Marian Vlad
• Menudier Cyrille

Classifications

• H02J5/005 Primary

  Electricity · mapped topic

• H02M7/217

  using semiconductor devices only · CPC title

• H04W52/0229 Primary

  where the received signal is a wanted signal · CPC title

• H04W52/028

  switching on or off only a part of the equipment circuit blocks · CPC title

• Y02B60/50

  Cross-Sectional Technologies · mapped topic