# US 10,312,741 B2 · Electronic unit and power feeding system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,741 B2 - Document ID: US10312741B2 - Status: Granted - Kind: B2 - Application number: 15/817,656 - Filed: 2017-11-20 - Published: 2018-03-15 - Granted: 2019-06-04 - Earliest claimed: 2013-04-08 - Assignees: Sony Corporation - Applicants: Sony Corporation - Inventors: Hiroaki Nakano; Toru Terashima; Keigo Bunsen - Web page: https://patentgrep.com/patent/US10312741B2 ## CPC - H02J 7/47: Arrangements for checking compatibility or authentication between one component, e.g. a battery or a battery charger, and another component, e.g. a power source - H02J 7/64: against overvoltage - H02J 50/10: using inductive coupling - H02J 50/12: of the resonant type - H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract An electronic unit includes: an electricity reception section configured to receive power fed from a power feeding unit using a magnetic field; a voltage detection section configured to detect a received voltage supplied from the electricity reception section; and a control section, wherein while preliminary power feeding at a lower power than main power feeding is performed from the power feeding unit, and when a received voltage detected by the voltage detection section is equal to or higher than a predetermined threshold voltage, the control section performs voltage reduction control so as to decrease the received voltage to lower than the threshold voltage. ## Claims ### Claim 1 An electronic unit, comprising: an electricity reception section configured to receive power fed from a power feeding unit wirelessly; a battery; and a control section configured to set to be disconnected from the electricity reception section to the battery during mutual authentication. ### Claim 2 (depends on 1) The electronic unit according to the claim 1, further comprising: a rectifier section configured to rectify the power supplied from the electricity reception section and be between the electricity reception section and the battery. ### Claim 3 (depends on 1) The electronic unit according to the claim 1, further comprising: one or more load section is between the electricity reception section and the battery. ### Claim 4 (depends on 1) The electronic unit according to the claim 1, further comprising: a voltage detection section detects a voltage rectified by a rectifier section. ### Claim 5 (depends on 1) The electronic unit according to the claim 1, wherein the control section controls a current flowing to a load section when a received voltage detected by the voltage detection section is equal to or higher than a predetermined threshold voltage. ### Claim 6 (depends on 1) The electronic unit according to claim 1, further comprising: a voltage reduction section includes one or more load section, wherein the control section performs the voltage reduction control using one or more of the load section. ### Claim 7 (depends on 6) The electronic unit according to claim 6, wherein the voltage reduction section includes a plurality of types of the load section having different load levels, and when the received voltage is equal to or higher than the threshold voltage, the control section allows a dummy load of a type, the type being selected from the plurality of types of load section in accordance with a level of that received voltage, to be connected between the supply lines. ### Claim 8 (depends on 7) The electronic unit according to claim 7, wherein the control section allows a dummy load having a relatively large load level to be connected between the supply lines with an increase in the received voltage. ### Claim 9 (depends on 6) The electronic unit according to claim 6, wherein when one or more of the load section has been connected between the supply lines, and when the received voltage is still equal to or higher than the threshold voltage, the control section allows the dummy load to be additionally connected between the supply lines, or changes the dummy load to a dummy load having a larger load level. ### Claim 10 (depends on 1) The electronic unit according to claim 1, wherein the control section performs the voltage reduction control through controlling a level of a load current flowing through a main load. ### Claim 11 (depends on 1) The electronic unit according to claim 1, wherein when the received voltage has been decreased to lower than the threshold voltage, the control section informs the power feeding unit of a start request of the main power feeding. ### Claim 12 (depends on 11) The electronic unit according to claim 11, wherein when the power feeding unit has started the main power feeding, the control section sets a secondary battery as a main load to a connection state, and allows start of operation of charging the secondary battery based on the main power feeding. ### Claim 13 (depends on 1) The electronic unit according to claim 1, wherein the threshold voltage is set to a value less than half the value of an element withstanding voltage in the electronic unit. ### Claim 14 (depends on 1) The electronic unit according to claim 1, wherein a value of the threshold voltage is varied in accordance with a level of received power received by the electricity reception section. ### Claim 15 (depends on 1) The electronic unit according to claim 1, wherein the mutual authentication indicates that a mutual communication operation is performed between the power feeding unit and the electronic unit.