IP Library › Granted Patent US 12689235

Granted Patent B2

US 12689235 · App. 18/058,834 · Granted Jul 21, 2026

Wireless power receiving device

Inventors: Koyo Kaiwa (Nagaokakyo, JP); Tatsuya Hosotani (Nagaokakyo, JP)

Assignee: Murata Manufacturing Co., Ltd.

H02J50/12 H02J7/90 H02J7/96 H02J2207/20 H02M3/137 H02M3/142 H02M3/156 H02M3/3155 H02M3/33507 H02M3/33546 H02M3/3376

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Quick Facts

Patent No.: US 12689235
App. No.: 18/058,834
Granted: Jul 21, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

A device includes a power receiving resonant circuit, a rectifier circuit, a voltage conversion circuit, and a charge control circuit that charges an electric storage device. The charge control circuit starts charging the electric storage device when a received voltage is greater than or equal to a first received voltage value, decreases a set value of a charging current for the electric storage device when a charging voltage is less than a predetermined charging voltage value, increases the set value of the charging current for the electric storage device when the received voltage is greater than or equal to a second received voltage value higher than a predetermined charging voltage value, and maintains the set value of the charging current when the charging voltage is greater than or equal to the predetermined charging voltage value and the received voltage is less than the second received voltage value.

Claims (51)

1 . A wireless power receiving device comprising:

a power receiving resonant circuit including a power receiving coil and a resonant capacitor connected to the power receiving coil;

a rectifier circuit configured to rectify a voltage of the power receiving resonant circuit;

a voltage conversion circuit configured to convert an output voltage of the rectifier circuit; and

a charge control circuit configured to charge an electric storage device with an output of the voltage conversion circuit, wherein

the charge control circuit includes

a received voltage detection circuit configured to detect a received voltage from the output voltage of the rectifier circuit, and

a charging voltage detection circuit configured to detect a charging voltage from an output voltage of the voltage conversion circuit; and

the charge control circuit is configured to

start charging the electric storage device when the received voltage is greater than or equal to a first received voltage value,

decrease a set value of a charging current for the electric storage device when the charging voltage is less than a predetermined charging voltage value,

increase the set value of the charging current for the electric storage device when the received voltage is greater than or equal to a second received voltage value, the second received voltage value being higher than the predetermined charging voltage value, and

maintain the set value of the charging current when the charging voltage is greater than or equal to the predetermined charging voltage value and the received voltage is less than the second received voltage value.

2 . The wireless power receiving device according to claim 1 , wherein

the charge control circuit is configured to control the rectifier circuit to stop rectification and thereby stops receiving power when the received voltage is greater than or equal to a third received voltage value, the third received voltage value being higher than the second received voltage value.

3 . The wireless power receiving device according to claim 1 , wherein

the charge control circuit is configured to stop charging when a charging current value for the electric storage device becomes less than or equal to a current corresponding to a fully charged state of the electric storage device.

4 . The wireless power receiving device according to claim 3 , wherein

5 . The wireless power receiving device according to claim 1 , wherein

the charge control circuit is configured to start charging when a voltage of the electric storage device becomes less than or equal to a predetermined value.

6 . The wireless power receiving device according to claim 5 , wherein

7 . The wireless power receiving device according to claim 5 , wherein

8 . The wireless power receiving device according to claim 1 , wherein

the charge control circuit is configured to stop charging when a voltage of the electric storage device becomes greater than or equal to a voltage value corresponding to a fully charged state of the electric storage device.

9 . The wireless power receiving device according to claim 8 , wherein

10 . The wireless power receiving device according to claim 8 , wherein

11 . The wireless power receiving device according to claim 8 , wherein

the charge control circuit is configured to start charging when a voltage of the electric storage device becomes less than or equal to a predetermined value.

12 . The wireless power receiving device according to claim 11 , wherein

13 . The wireless power receiving device according to claim 1 , wherein

the set value of the charging current is set at multiple discrete values.

14 . The wireless power receiving device according to claim 13 , wherein

15 . The wireless power receiving device according to claim 13 , wherein

16 . The wireless power receiving device according to claim 13 , wherein

the charge control circuit is configured to start charging when a voltage of the electric storage device becomes less than or equal to a predetermined value.

17 . The wireless power receiving device according to claim 16 , wherein

18 . The wireless power receiving device according to claim 13 , wherein

19 . The wireless power receiving device according to claim 18 , wherein

the charge control circuit is configured to start charging when a voltage of the electric storage device becomes less than or equal to a predetermined value.

20 . The wireless power receiving device according to claim 18 , wherein