Standby circuit for an electrical device

• US 7,444,530 B2
• Filed: 02/06/2002
• Issued: 10/28/2008
• Est. Priority Date: 02/10/2001
• Status: Active Grant

• Current Assignee: Tamiras Per Pte Ltd LLC (Intellectual Ventures LLC)
• Original Assignee: NXP B.V. (NXP Semiconductors NV)
• Inventors: Wendt, Matthias, Deppe, Carsten, Luerkens, Peter, Duerbaum, Thomas, Loef, Christoph, Sauerlaender, Georg
• Primary Examiner(s): ELAMIN, ABDELMONIEM I
• Application Number:
  US10/071,391
• Publication Number:
  US 20020190797A1
• Time in Patent Office: 2,456 Days
• Field of Search: 713/300, 713/310, 713320-324, 713/330, 713/340, 348/734
• US Class Current: 713/323
• CPC Class Codes: H02J 9/005 using a power saving mode for copiers G03G15/5004

Abstract

The invention relates to a standby circuit, an electrical device with a standby circuit, a method for the control of the electrical device and a power supply assembly. Whereas the power supply unit and the control electronics are in permanent operation when conventional devices are in the standby mode and consequently have a high power consumption, the invention proposes a solution for saving energy while retaining convenience of operation by which the power supply unit is switched off in the standby mode. A standby circuit, preferably fed by an energy buffer element, remains active in the standby mode and monitors signal inputs for activation events. When an activation event occurs, the standby circuit switches on the power supply unit.

Claims

1. A standby circuit for an electrical device having

one or more signal inputs and

a control unit and

a control output for the control of a power supply unit,

in which the control unit initiates an activation procedure on the occurrence of a predefined activation event at the signal input,

in which a signal to switch on a power supply unit is generated at the control output;

further comprising a programming interface for programming the control unit, wherein the programming determines how the control unit responds to inputs from the one or more signal inputs.

2. A standby circuit as claimed in claim 1, in which one of the signal inputs is a useful signal input for a useful signal of an electrical device.

3. A standby circuit as claimed in claim 1, in which one of the signal inputs is a switch input for the connection of a button.

4. A standby circuit as claimed in claim 1, in which one of the signal inputs is a remote control input for the signals from a wireless remote control.

5. A standby circuit as claimed in claim 4, in which the signal input for the connection of an infrared sensor element is suitable for the detection of the signals from an infrared remote control.

6. A standby circuit as claimed in claim 1, in which one of the signal inputs is a digital data input, which can be connected to any digital interface, such as computer networks.

7. A standby circuit as claimed in claim 1, in which a store is provided.

8. A standby circuit as claimed in claim 1, in which a clock is provided.

9. A standby circuit as claimed in claim 8, in which

the control unit performs a time switch function,

in which an activation time is preset, and the activation procedure is initiated on reaching the activation time.

10. A standby circuit as claimed in claim 1, in which one or more clock inputs are provided.

11. A standby circuit as claimed in claim 1, in which one or more communication terminals are provided for sending and/or receiving data to/from the control unit and/or the store.

12. A standby circuit as claimed in claim 1, in which the circuit is constructed as a single integrated component.

13. A standby circuit as claimed in claim 1, in which the control unit forwards the signals arriving at the remote control input via a communication terminal.

14. A standby circuit as claimed in claim 1, in which

a store stores remote control activation signals,

the control unit compares signals arriving at the remote control input with the stored activation signals,

and if they match initiates the activation procedure.

15. An electrical device with

one or more functional units

and a power supply unit for connection to a power supply and for feeding the functional units with electrical energy, characterized in that

the device is switchable into a power-down mode, in which the power supply unit is switched off and draws no further electrical power from an external electrical power source, while a standby circuit remains active, which switches on the power supply unit of the device at the occurrence of an activation event,

an energy store configured to supply stored electrical energy to the standby circuit while the power supply unit is switched off and draws no further electrical power from an external electrical power source;

in which the energy store is a rechargeable element, while the energy store is charged when the power supply unit is switched on; and

in which;

the control unit of the standby circuit is programmed when the device is switched to the power-down mode so that,

after a predetermined period of time the device is switched back to the power-up mode, so that the energy store is charged again,

while the period of time is calculated so that the rechargeable element supplies sufficient electrical energy for the operation of the standby circuit for this period of time.

16. An electrical device as claimed in claim 15 comprising a standby circuit.

17. An electrical device as claimed in claim 15, comprising a circuit for monitoring the remaining content of the energy store.

18. A method for the control of an electrical device, in which an electrical device, which has one or more functional units and at least one power supply unit for feeding the functional units with electrical energy, is switched from a power-up mode to a power-down mode, while at least one power supply unit is switched on in the power-up mode and all the power supply units are switched off in the power-down mode, but while a standby circuit remains active in the power-down mode, which standby circuit monitors one or more signal inputs for the occurrence of an activation event, and which switches the device from the power-down mode to the power-up mode again at the occurrence of an activation event, and in which the standby circuit is programmed by way of a communication interface and which bi-directional data exchange occurs between the standby circuit and the one or more functional units.

19. A method as claimed in claim 18, in which

the initiating activation event is stored in the standby circuit,

and is interrogated after the device has been switched on.