WIRELESS POWER RECEIVER

• US 20180062445A1
• Filed: 03/15/2016
• Published: 03/01/2018
• Est. Priority Date: 03/18/2015
• Status: Active Grant

• Current Assignee: MAPS, Inc.
• Original Assignee: MAPS, Inc.
• Inventors: HWANG, Jong Tae, SHIN, Hyun Ick, KO, Min Jung, LEE, Dong Su, LEE, Jong Hoon, JIN, Ki-Woong, RHEE, Joon
• Granted Patent: US 10,320,239 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• CPC Class Codes: H02M 7/06 using discharge tubes without control electrode or semiconductor devices without control electrode
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A wireless power receiver is disclosed. The wireless power receiver comprises: a resonance tank for receiving magnetic resonance-type wireless power; a rectifier including a diode bridge and a first switch connected to both ends of any one diode for forming the diode bridge, so as to rectify wireless power received by the resonance tank and supply the rectified wireless power to a load; and a controller controlling the first switch so as to operate the rectifier as a full-wave rectifier or a half-wave rectifier.

Claims

1. A wireless power receiving unit comprising:

a resonant tank configured to receive wireless power in a magnetic resonance manner;

a rectifier configured to rectify the wireless power received by the resonant tank and supply the rectified current to a load, the rectifier comprising a diode bridge and a first switch connected across any one of diodes constituting the diode bridge; and

a controller configured to control the first switch to enable the rectifier to operate as a full-wave rectifier or a half-wave rectifier.

2. The wireless power receiving unit of claim 1, wherein when the rectifier operates as a full-wave rectifier, a current flowing from the resonant tank is classified as a forward current returning to the resonant tank sequentially via a first diode and a fourth diode of the diode bridge and a reverse current returning to the resonant tank via a second diode and a third diode of the diode bridge, wherein

the first switch being connected across the fourth diode.

3. The wireless power receiving unit of claim 2, wherein the controller detects an output voltage of the rectifier, compares the detected output voltage with a reference voltage, and controls the first switch to be turned on or off according to a result of the comparison.

4. The wireless power receiving unit of claim 2, wherein the rectifier further comprises a bypass capacitor configured to prevent some current from being supplied from the resonant tank to the load.

5. The wireless power receiving unit of claim 4, wherein the rectifier further comprises a second switch connected to the bypass capacitor and configured to bypass some current supplied from the resonant tank to the load by the control of the controller.

6. The wireless power receiving unit of claim 5, wherein the controller controls the first switch and the second switch on the basis of a predetermined reference voltage and the output voltage of the rectifier, respectively.

7. The wireless power receiving unit of claim 5, wherein the controller comprises:

a first comparison controller configured to compare a first generated voltage generated by detecting the output voltage of the rectifier at a first node of a plurality of resistors connected in series with a reference voltage and control the first switch; and

a second comparison controller configured to compare a second generated voltage generated by detecting the output voltage of the rectifier at a second node of the plurality of resistors connected in series with the reference voltage and control the second switch, wherein

the first generated voltage is higher than the second generated voltage.

8. The wireless power receiving unit of claim 5, wherein the controller comprises:

a variable reference voltage generator configured to generate a variable reference voltage such that a voltage generated by detecting the output voltage of the rectifier is equal to a predetermined reference voltage;

a first comparison controller configured to compare a first generated voltage generated by detecting the output voltage of the rectifier at a first node of a plurality of resistors connected in series with the variable reference voltage and control the first switch; and

a second comparison controller configured to compare a second generated voltage generated by detecting the output voltage of the rectifier at a second node of the plurality of resistors connected in series with the variable reference voltage and control the second switch, wherein

the first generated voltage is higher than the second generated voltage.