# US 2014/0195842 A1 · System comprising a main electrical unit and a peripheral electrical unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0195842 A1 - Document ID: US20140195842A1 - Status: Published application - Kind: A1 - Application number: 14/239,162 - Filed: 2012-08-17 - Published: 2014-07-10 - Earliest claimed: 2011-08-23 - Assignees: Koninklijke Philips N.V. - Inventors: Biju Kumar Sreedharan Nair; Willem Franke Pasveer - Web page: https://patentgrep.com/patent/US20140195842A1 ## CPC - H05B 47/105: in response to determined parameters - G06F 1/3293: by switching to a less power-consuming processor, e.g. sub-CPU - H05B 47/18: via data-bus transmission - H05B 47/10: Controlling the light source - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract The invention relates to a system comprising a main electrical unit (2) and a peripheral electrical unit (3, 4,5), wherein the main electrical unit and the peripheral electrical unit are switchable between a low-power mode and a high-power mode. The main electrical unit is adapted to hand over a control of the system to the peripheral electrical unit, if the peripheral electrical unit is in the high-power mode, and to switch from the high-power mode to the low-power mode, after the control has been handed over. The peripheral electrical unit is adapted to receive the control from the main electrical unit and to control the system, if the peripheral electrical unit is in the high-power mode. This allows the system to be still in operation mode, although the main electrical unit has been switched to the low-power mode, thereby reducing the power consumption of the system. ## Claims ### Claim 1 A system comprising a main electrical unit and a peripheral electrical unit, wherein the main electrical unit is a control unit adapted to initially control the system, wherein the peripheral electrical unit is adapted for being initially controlled by the main electrical unit, wherein the main electrical unit and the peripheral electrical unit are switchable between a low-power mode and a high-power mode, wherein the main electrical unit is adapted to hand over a control of the system to the peripheral electrical unit, if the peripheral electrical unit is in the high-power mode, and to switch from the high-power mode to the low-power mode, after the control has been handed over, wherein the peripheral electrical unit is adapted to receive the control from the main electrical unit and to control the system, if the peripheral electrical unit is in the high-power mode. ### Claim 2 (depends on 1) The system as defined in claim 1, wherein the main electrical unit comprises forward handover rules defining under which conditions the control is to be handed over to the peripheral electrical unit and wherein the main electrical unit is adapted to hand over the control to the peripheral electrical unit, if the conditions defined by the forward handover rules are fulfilled. ### Claim 3 The system as defined in claim I, wherein the system comprises a plurality of peripheral electrical units and wherein the main electrical unit is adapted to hand over the control to one or several peripheral electrical units, which are in the high-power mode, if the number of peripheral electrical units, which are in the high-power mode, is smaller than or equal to a predefined number. ### Claim 4 (depends on 1) The system as defined in claim 1, wherein the system comprises a plurality of peripheral electrical units and wherein the main electrical unit is adapted to hand over the control to one peripheral electrical unit, which is in the high-power mode, if only the one peripheral electrical unit is in the high-power mode. ### Claim 5 (depends on 1) The system as defined in claim 1, wherein the peripheral electrical unit is adapted to send an acknowledgement to the main electrical unit, if the peripheral electrical unit has received the control, wherein the main electrical unit is adapted to switch from the high-power mode to the low-power mode, after the main electrical unit has received the acknowledgement. ### Claim 6 (depends on 1) The system as defined in claim 1, wherein the peripheral electrical unit comprises back handover rules defining under which conditions the control is to be handed over back to the main electrical unit and wherein the peripheral electrical unit is adapted to hand over the control back to the main electrical unit, if the conditions defined by the back handover rules are fulfilled. ### Claim 7 (depends on 6) The system as defined in claim 6, wherein the main electrical unit is adapted to send an acknowledgement to the peripheral electrical unit, if the main electrical unit has received the control, wherein the peripheral electrical unit is adapted to continue controlling the system, until the peripheral electrical unit has received the acknowledgement. ### Claim 8 (depends on 1) The system as defined in claim 1, wherein the main electrical unit is a microcontroller unit and the system comprises one or several peripheral electrical units being at least one of a sensor, a transceiver, an interface, and a light source. ### Claim 9 (depends on 1) The system as defined in claim 1, wherein the main electrical unit is adapted to hand over control rules with handing over the control to the peripheral electrical unit, wherein the control rules define the control performed by the peripheral electrical unit. ### Claim 10 (depends on 9) The system as defined in claim 9, wherein the system comprises several peripheral electrical units and wherein the control rules define which requests can be sent to which peripheral electrical unit by the peripheral electrical unit having the control. ### Claim 11 (depends on 1) The system as defined in claim 1, wherein the system comprises several peripheral electrical units, wherein the peripheral electrical units are switchable between a low-power mode and a high-power mode, wherein the main electrical unit is adapted to hand over a control of the system from the one or several of the peripheral electrical units, if the respective one or several peripheral electrical units are in the high-power mode, and to switch the main electrical unit from the high-power mode to the low-power mode, after the control has been handed over, wherein the peripheral electrical units are adapted to receive the control from the respective main electrical unit and to control the system, if the respective peripheral electrical unit is in the high-power mode. ### Claim 12 A method for controlling a system comprising a main electrical unit and a peripheral electrical unit, wherein the main electrical unit is a control unit adapted to initially control the system, wherein the peripheral electrical unit is adapted for being initially controlled by the main electrical unit, wherein the main electrical unit and the peripheral electrical unit are switchable between a low-power mode and a high-power mode, the method comprising: handing over a control of the system from the main electrical unit to the peripheral electrical unit, if the peripheral electrical unit is in the high-power mode, controlling the system by the peripheral electrical unit, if the peripheral electrical unit is in the high-power mode and has received the control from the main electrical unit, and switching the main electrical unit from the high-power mode to the low-power mode, after the control has been handed over. ### Claim 13 (depends on 11) A computer program for controlling a system comprising a main electrical unit and a peripheral electrical unit, wherein the main electrical unit and the peripheral electrical unit are switchable between a low-power mode and a high-power mode, the computer program comprising program code means for causing the system to carry out the steps of the method as defined in claim 11, when the computer program is run on a computer controlling the system.