Control device, power receiving device, and electronic apparatus

• US 10,418,854 B2
• Filed: 02/27/2018
• Issued: 09/17/2019
• Est. Priority Date: 03/02/2017
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Onishi, Kota
• Primary Examiner(s): Diao, M Baye
• Application Number:
  US15/906,869
• Publication Number:
  US 20180254666A1
• Time in Patent Office: 567 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence

Abstract

A control device for a power receiving device that receives power supplied from a power transmitting device by contactless power transmission, including a charger that charges a battery based on the received power, a discharger that performs discharging operation of the battery and power supply operation in which power from the battery is supplied to a power supply target, and a controller that controls the discharger, and the controller stops the power supply operation when a magnetic detection signal from a magnetic detection element becomes active.

Claims

1. A control device for a power receiving device that receives power supplied from a power transmitting device by contactless power transmission, comprising:

a charger configured to charge a battery based on the received power;

a discharger configured to perform a discharging operation of the battery and a power supply operation in which power from the battery is supplied to a power supply target; and

a controller configured to control the discharger,

wherein the controller stops the power supply operation when a magnetic detection signal from a magnetic detection element becomes active.

2. The control device according to claim 1, wherein

the controller starts the power supply operation when the magnetic detection signal becomes inactive.

3. The control device according to claim 1, wherein

the controller starts the power supply operation on condition that removal of the power receiving device is detected, and

stops the power supply operation when the magnetic detection signal becomes active.

4. The control device according to claim 1, comprising:

a power control signal terminal configured to control on and off of power supply to the magnetic detection element,

wherein the controller controls activation and deactivation of the output signal of the power control signal terminal.

5. The control device according to claim 1, wherein

the controller performs control to turn off the power supply to the magnetic detection element on condition that landing of the power receiving device is detected.

6. The control device according to claim 1, wherein

the controller stops the power supply operation on condition that landing of the power receiving device is detected.

7. The control device according to claim 1, wherein

the controller performs control to turn off power supply to the magnetic detection element when at least one of over-discharge and over-current is detected.

8. The control device according to claim 7, wherein

the controller stops the power supply operation on condition that at least one of over-discharge and over-current is detected.

9. The control device according to claim 1, comprising:

a monitor configured to monitor an operation state of a switch, wherein

the controller stops the power supply operation when an off operation of the switch is detected by the monitor.

10. The control device according to claim 9, wherein

the controller performs control to turn off the power supply to the magnetic detection element when the off operation of the switch is detected by the monitor.

12. A power receiving device comprising the control device according to claim 1.

13. A power receiving device comprising:

the control device according to claim 1; and

a power source supply circuit configured to control on and off of supply of battery voltage to the magnetic detection element,

wherein the power supply circuit includes;

a first transistor in which the signal from the controller is supplied to a gate terminal;

a second transistor in which a gate terminal is connected to a drain terminal of the first transistor, the battery voltage is supplied to a source terminal, and a drain terminal is connected to the magnetic detection element; and

a resistor provided between the source terminal and the gate terminal of the second transistor.

14. An electronic apparatus comprising the control device according to claim 1.

11. A control device for a power receiving device that receives power supplied from a power transmitting device by wireless power transmission, comprising:

a discharger configured to perform a discharging operation of a battery that is charged based on the received power, and perform a power supply operation for supplying power from the battery to a power supply target;

a controller configured to control the discharger; and

and a power control signal terminal configured to control on and off of power supplied to a device that operates with battery voltage,

wherein the controller, when removal of the power receiving device is detected, performs control to activate the output of the power control signal terminal and turn on the supply of the battery voltage to the device, and

when landing of the power receiving device is detected, performs control to deactivate the output of the power control signal terminal and turn off the supply of the battery voltage to the device.