RECEIVING CIRCUIT FOR MAGNETIC COUPLING RESONANT WIRELESS POWER TRANSMISSION

• US 20170070082A1
• Filed: 03/03/2015
• Published: 03/09/2017
• Est. Priority Date: 03/05/2014
• Status: Active Grant

• Current Assignee: Eaton Capital Unlimited Co. (Eaton Corporation PLC.)
• Original Assignee: Cooper Industries Holdings Ireland
• Inventors: ZHAO, TIEFU, PAHL, BIRGER, HUA, YAHAN, ZHENG, GERALD, GU, JACK, WU, BRUCE, XU, JUN
• Granted Patent: US 10,141,787 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00711 with introduction of pulses during the charging process
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: H02J 7/06 using discharge tubes or semiconductor devices
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 7/06 using discharge tubes without control electrode or semiconductor devices without control electrode
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
• 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

The present invention provides a receiving circuit for magnetic coupling resonant wireless power transmission comprising: a resonant circuit, which comprises a resonant coil and a resonant capacitor; a rectifying circuit, the input of which is electrically connected to the two terminals of the resonant capacitor; a storage capacitor, the two terminals of which are electrically connected to the output of rectifying circuit; and a DC-DC converter, the input of which is electrically connected to the two terminals of the storage capacitor and the output of which is electrically connected to a rechargeable battery. The receiving circuit for magnetic coupling resonant wireless power transmission of the present invention can save energy and has high charge efficiency.

Claims

1. A receiving circuit for magnetic coupling resonant wireless power transmission comprising:

a resonant circuit comprising a resonant coil and a resonant capacitor;

a rectifying circuit having an input electrically connected to two terminals of the resonant capacitor;

a storage capacitor having two terminals electrically connected to an output of rectifying circuit; and

a DC-DC converter having an input electrically connected to the two terminals of the storage capacitor and an output of which is electrically connected to a battery.

2. The receiving circuit for magnetic coupling resonant wireless power transmission according to claim 1, wherein the DC-DC converter comprises a boost circuit.

3. The receiving circuit for magnetic coupling resonant wireless power transmission according to claim 2, wherein the boost circuit comprises an inductor, a diode and a metal oxide semiconductor field effect transistor, wherein a first terminal of the inductor is electrically connected to a first one of the two terminals of the storage capacitor, a second terminal of the inductor is electrically connected to an anode of the diode and a drain of the metal oxide semiconductor field effect transistor, a source of the metal oxide semiconductor field effect transistor is electrically connected to a second one of the two terminals of the storage capacitor, and a cathode of the diode and a source of the metal oxide semiconductor field effect transistor act as the output of the boost circuit.

4. The receiving circuit for magnetic coupling resonant wireless power transmission according to claim 3, further comprising a filtering capacitor and a first switch, connected in series and electrically connected to the drain and source of the metal oxide semiconductor field effect transistor.

5. The receiving circuit for magnetic coupling resonant wireless power transmission according to claim 4, further comprising a second switch, wherein the second switch and the diode in the Boost circuit are connected in parallel.

6. The receiving circuit for magnetic coupling resonant wireless power transmission according to claim 1, wherein the rectifying circuit is a full bridge rectifying circuit.

7. A magnetic coupling resonant wireless power transmission circuit comprising:

a receiving circuit for magnetic coupling resonant wireless power transmission and a resonant transmitting circuit,

wherein the receiving circuit comprises;

a resonant circuit comprising a resonant coil and a resonant capacitor;

a rectifying circuit having an input electrically connected to an output of the resonant circuit;

a storage capacitor having two terminals of which are electrically connected to an output of rectifying circuit;

a boost circuit comprising an inductor, a diode and a metal oxide semiconductor field effect transistor, wherein a first terminal of the inductor is electrically connected to a first one of the two terminals of the storage capacitor, a second terminal of the inductor is electrically connected to an anode of the diode and a drain of the metal oxide semiconductor field effect transistor, a source of the metal oxide semiconductor field effect transistor is electrically connected to a second one of the two terminals of the storage capacitor, and a cathode of the diode and a source of the metal oxide semiconductor field effect transistor act as an output of the boost circuit which is electrically connected to a battery, and wherein

the resonant transmitting circuit comprises a semiconductor switch.

8. The magnetic coupling resonant wireless power transmission circuit according to claim 7, wherein the receiving circuit further comprises a filtering capacitor and a first switch connected in series and electrically connected to the drain and source of the metal oxide semiconductor field effect transistor.

9. The magnetic coupling resonant wireless power transmission circuit according to claim 8, wherein the receiving circuit further comprises a second switch, wherein the second switch and the diode in the boost circuit are connected in parallel.

10. The magnetic coupling resonant wireless power transmission circuit according to claim 9, wherein the magnetic coupling resonant wireless power transmission circuit further comprises:

a main control device including a main central processing unit (CPU), a main transceiver module and a first driver module;

a sub control device including a sub CPU, a sub transceiver module and a second driver module;

a charging detection module configured to detect a charging status of the battery and to provide charging status data of the battery to the sub CPU;

a voltage detection module configured to detect a voltage of the storage capacitor and to provide a voltage value of the storage capacitor to the sub CPU;

wherein the sub CPU is configured to transmit the charging status data and the voltage value of the storage capacitor to the main CPU via the sub transceiver module and the main transceiver module, the main CPU is configured to control the semiconductor switch to operate in a pulse frequency modulation via the first driver module according to the charging status data and the voltage value of the storage capacitor, and the sub CPU is configured to control the metal oxide semiconductor field effect transistor to switch off and control the first switch and the second switch to be in on-state or off-state simultaneously via the second driver module according to the charging status data and the voltage value of the storage capacitor;

or

the sub CPU is configured to transmit the charging status data and the voltage value of the storage capacitor to the main CPU via the sub transceiver module and the main transceiver module, the main CPU is configured to control the semiconductor switch to switch off via the first driver module according to the charging status data and the voltage value of the storage capacitor, the sub CPU is configured to control the metal oxide semiconductor field effect transistor to operate in a pulse width modulation and control the first switch and the second switch to be in off-state simultaneously via the second driver module according to the charging status data and the voltage value of the storage capacitor.

11. A method of operating the magnetic coupling resonant wireless power transmission circuit according to claim 10, the method comprising:

(a) when the voltage of the battery is lower than a first predetermined threshold voltage, controlling the resonant transmitting circuit to operate in a pulse frequency modulation and the metal oxide semiconductor field effect transistor to switch off;

(b) when the voltage of the battery is higher than the first predetermined threshold voltage, controlling the resonant transmitting circuit to work intermittently, wherein

when the voltage value of the storage capacitor is higher than a second predetermined threshold voltage, controlling the resonant transmitting circuit to switch off and the metal oxide semiconductor field effect transistor to operate in a pulse width modulation, so that the storage capacitor charges the rechargeable battery via the boost circuit;

when the voltage value of the storage capacitor is lower than the second predetermined threshold voltage, controlling the resonant transmitting circuit to operate in a pulse frequency modulation and the metal oxide semiconductor field effect transistor to switch off, so that the resonant transmitting circuit charges the storage capacitor via the resonant circuit and the rectifying circuit.

12. The method according to claim 11, wherein the receiving circuit further comprises a filtering capacitor and a first switch, wherein the filtering capacitor and the first switch are connected in series and then are electrically connected to the drain and source of the metal oxide semiconductor field effect transistor, wherein the method further comprises:

in the step (a), controlling the first switch to switch on;

in the step (b), controlling the first switch to switch off.

13. The control method according to claim 12, wherein the receiving circuit further comprises a second switch, wherein the second switch and the diode in the Boost circuit are connected in parallel, wherein the method further comprises:

in the step (a), controlling the second switch to switch on;

in the step (b), controlling the second switch to switch off.