WIRELESS CHARGING DEVICE

• US 20170005502A1
• Filed: 07/29/2015
• Published: 01/05/2017
• Est. Priority Date: 03/03/2015
• Status: Active Grant

• Current Assignee: Huizhou TCL Mobile Communication Company Limited (TCL Technology Group Corp.)
• Original Assignee: Huizhou TCL Mobile Communication Company Limited (TCL Technology Group Corp.)
• Inventors: WANG, Jiang
• Granted Patent: US 9,973,030 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters

Abstract

Disclosed is a wireless charging device, including: an oscillating module, a rectifier voltage reduction module, a power management module, and a Bluetooth communications module, wherein the Bluetooth communications module communicates with a charging socket to acquire a charging communications protocol, the oscillating module receives a signal from the charging socket and oscillates to generate AC, the rectifier voltage reduction module rectifies and reduces the voltage of the AC and then outputs a DC reference voltage, and the power management module reduces the reference voltage and then outputs a charging voltage to charge a battery.

Claims

1. A wireless charging device connected to a charging socket and a battery, the wireless charging device comprising:

an oscillating module;

a rectifier voltage reduction module;

a power management module; and

a Bluetooth communications module, wherein the oscillating module, the rectifier voltage reduction module, and the power management module are sequentially connected, wherein the Bluetooth communications module is connected with the rectifier voltage reduction module, and the power management module is connected with the battery,

wherein a communications connection is established between the Bluetooth communications module and the charging socket via Bluetooth to acquire a charging communications protocol, the oscillating module receives a signal from the charging socket and conducts a magnetic resonance to generate AC, the rectifier voltage reduction module rectifies and reduces a voltage of the AC and then outputs a DC reference voltage, and the power management module reduces the reference voltage and then outputs a charging voltage to charge the battery.

2. The wireless charging device of the claim 1, wherein the oscillating module comprises a first antenna, a second antenna, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;

the first antenna is connected to one end of the first capacitor;

the other end of the first capacitor is connected to one end of the fifth capacitor and the rectifier voltage reduction module;

the second capacitor is connected in parallel with the first capacitor;

the second antenna is connected to one end of the third capacitors;

the other end of the third capacitor is connected to the other end of the fifth capacitor and the rectifier voltage reduction module; and

the fourth capacitor is connected in parallel with the third capacitor.

3. The wireless charging device of claim 2, wherein the rectifier voltage reduction module comprises a resonance chip and an inductor;

an AC+ terminal of the resonance chip is connected to the other end of the first capacitor and one end of the fifth capacitors;

an AC−

terminal of the resonance chip is connected to the other end of the third capacitor and the other end of the fifth capacitors;

an SW terminal of the resonance chip is connected to one end of the inductor;

the other end of the inductor is connected to the power management module;

a TEMP terminal of the resonance chip is connected to the Bluetooth communications module;

a PVIN terminal of the resonance chip is connected to a power supply terminal; and

both a PGND terminal and a PGND2 terminal of the resonance chip are grounded.

4. The wireless charging device of claim 3, wherein the rectifier voltage reduction module further comprises:

a first protection circuit, a second protection circuit, and a detection circuit;

the detection circuit is connected to the resonance chip, the first protection circuit and the second protection circuit;

both the first protection circuit and the second protection circuit are respectively connected to the oscillating module; and

when the detection circuit detects that a voltage of the resonance chip is greater than a preset voltage, the detection circuit outputs a buck signal to the first protection circuit and the second protection circuit, so that the first protection circuit and the second protection circuit reduce the voltage of the oscillating module.

5. The wireless charging device of claim 4, wherein the first protection circuit comprises a first MOS transistor and a sixth capacitor;

a gate of the first MOS transistor is connected to the detection circuit;

a drain of the first MOS transistor is connected to the first antenna and one end of the first capacitor by means of the sixth capacitor; and

a source of the first MOS transistor is grounded.

6. The wireless charging device of claim 5, wherein the second protection circuit comprises a second MOS transistor and a seventh capacitor;

a gate of the second MOS transistor is connected to the detection circuit;

a drain of the second MOS transistor is connected to the second antenna and one end of the third capacitor by means of the seventh capacitor; and

a source of the second MOS transistor is grounded.

7. The wireless charging device of claim 6, wherein the detection circuit comprises a first resistor, a second resistor, an eighth capacitor and an inverter;

one end of the first resistor is connected to the gate of the first MOS transistor and the gate of the second MOS transistor;

the other end of the first resistor is connected to a B2 pin of the inverted;

a B1 pin of the inverter is grounded;

an A1 pin of the inverter is connected to a CLAMP1 terminal of the resonance chip and one end of the second resistor;

an A2 pin of the inverter is connected to the power supply terminal and the other end of the second resistor; and

the A2 pin of the inverter is also grounded by means of the eighth capacitor.

8. The wireless charging device of claim 7, wherein the rectifier voltage reduction module further comprises a temperature detecting circuit configured to detect a temperature of the resonance chip and transmit the temperature of the resonance chip to the Bluetooth communications module for temperature monitoring, and the temperature detecting circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a ninth capacitor;

and wherein

one end of the third resistor is connected to a TEMP pin of the resonance chip, one end of the fourth resistor and one end of the fifth resistor;

one end of the ninth capacitor is connected to one end of the fourth resistor and the Bluetooth communications module;

the other end of the third resistor, the other end of the fourth resistor, and the other end of the ninth capacitor are respectively grounded; and

the other end of the fifth resistor is connected to a VLDO terminal of the resonance chip, and is connected to the Bluetooth communications module by means of the sixth resistor.

9. The wireless charging device of claim 8, wherein the rectifier voltage reduction module further comprises a current detecting circuit;

the current detecting circuit comprises a seventh resistor;

one end of the seventh resistor is connected to a VRECTS1 terminal and a VRECT terminal of the resonance chip; and

the other end of the seventh resistor is connected to a VRECTS2 terminal and a PVIN terminal of the resonance chip.

10. The wireless charging device of claim 9, wherein the power management module comprises a charging chip, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor and an eleventh capacitor;

an OUT pin of the charging chip is connected to the battery and is also grounded by means of the tenth capacitor;

a TS pin of the charging chip is grounded by means of the eighth resistor;

a PRE_TERM pin of the charging chip is grounded by means of the ninth resistor, an ISET pin of the charging chip is grounded by means of the tenth resistor;

a VSS pin of the charging chip is grounded;

an IN pin of the charging chip is connected to the other end of the inductor and one end of the eleventh resistor and is also grounded by means of the eleventh capacitor;

the other end of the eleventh resistor is connected to one end of the twelfth resistor and a master controller; and

the other end of the twelfth resistor is grounded by means of the thirteenth resistor.

11. A wireless charging device connected to a charging socket and a battery, the wireless charging device comprising:

an oscillating module;

a rectifier voltage reduction module;

a power management module; and

a Bluetooth communications module, wherein the oscillating module, the rectifier voltage reduction module, and the power management module are sequentially connected;

the Bluetooth communications module is connected with the rectifier voltage reduction module; and

the power management module is connected with the battery, and wherein

the Bluetooth communications module communicates with the charging socket to acquire a charging communications protocol, the oscillating module receives a signal from the charging socket and oscillates to generate AC, the rectifier voltage reduction module rectifies and reduces the voltage of the AC and then outputs a DC reference voltage, and the power management module reduces the reference voltage and then outputs a charging voltage to charge the battery.

12. The wireless charging device of the claim 11, wherein the oscillating module comprises a first antenna, a second antenna, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor;

the first antenna is connected to one end of the first capacitor;

the other end of the first capacitor is connected to one end of the fifth capacitor and the rectifier voltage reduction module;

the second capacitor is connected in parallel with the first capacitor;

the second antenna is connected to one end of the third capacitor;

the other end of the third capacitor is connected to the other end of the fifth capacitor and the rectifier voltage reduction module; and

the fourth capacitor is connected in parallel with the third capacitor.

13. The wireless charging device of claim 12, wherein the rectifier voltage reduction module comprises a resonance chip and an inductor;

an AC+ terminal of the resonance chip is connected to the other end of the first capacitor and one end of the fifth capacitor;

an AC−

terminal of the resonance chip is connected to the other end of the third capacitor and the other end of the fifth capacitor;

an SW terminal of the resonance chip is connected to one end of the inductor;

the other end of the inductor is connected to the power management module;

a TEMP terminal of the resonance chip is connected to the Bluetooth communications module;

a PVIN terminal of the resonance chip is connected to a power supply terminal; and

both a PGND terminal and a PGND2 terminal of the resonance chip are grounded.

14. The wireless charging device of claim 13, wherein the rectifier voltage reduction module further comprises:

a first protection circuit, a second protection circuit, and a detection circuit;

the detection circuit is connected to the resonance chip, the first protection circuit and the second protection circuit;

both the first protection circuit and the second protection circuit are respectively connected to the oscillating module; and

when the detection circuit detects that a voltage of the resonance chip is greater than a preset voltage, the detection circuit outputs a buck signal to the first protection circuit and the second protection circuit, so that the first protection circuit and the second protection circuit reduce the voltage of the oscillating module.

15. The wireless charging device of claim 14, wherein the first protection circuit comprises a first MOS transistor and a sixth capacitor;

a gate of the first MOS transistor is connected to the detection circuit;

a drain of the first MOS transistor is connected to the first antenna and one end of the first capacitor by means of the sixth capacitor; and

a source of the first MOS transistor is grounded.

16. The wireless charging device of claim 15, wherein the second protection circuit comprises a second MOS transistor and a seventh capacitor;

a gate of the second MOS transistor is connected to the detection circuit;

a drain of the second MOS transistor is connected to the second antenna and one end of the third capacitor by means of the seventh capacitor; and

a source of the second MOS transistor is grounded.

17. The wireless charging device of claim 16, wherein the detection circuit comprises a first resistor, a second resistor, an eighth capacitor and an inverter;

one end of the first resistor is connected to the gate of the first MOS transistor and the gate of the second MOS transistor, the other end of the first resistor is connected to a B2 pin of the inverter;

a B1 pin of the inverter is grounded;

an A1 pin of the inverter is connected to a CLAMP1 terminal of the resonance chip and one end of the second resistor;

an A2 pin of the inverter is connected to the power supply terminal and the other end of the second resistor; and

the A2 pin of the inverter is also grounded by means of the eighth capacitor.

18. The wireless charging device of claim 17, wherein the rectifier voltage reduction module further comprises a temperature detecting circuit configured to detect a temperature of the resonance chip and transmit the temperature of the resonance chip to the Bluetooth communications module for temperature monitoring;

and the temperature detecting circuit comprises a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a ninth capacitor, and wherein

one end of the third resistor is connected to a TEMP pin of the resonance chip, one end of the fourth resistor and one end of the fifth resistor;

one end of the ninth capacitor is connected to one end of the fourth resistor and the Bluetooth communications module;

the other end of the third resistor, the other end of the fourth resistor, and the other end of the ninth capacitor are respectively grounded; and

the other end of the fifth resistor is connected to a VLDO terminal of the resonance chip, and is connected to the Bluetooth communications module by means of the sixth resistor.

19. The wireless charging device of claim 18, wherein the rectifier voltage reduction module further comprises a current detecting circuit;

the current detecting circuit comprises a seventh resistor;

one end of the seventh resistor is connected to a VRECTS1 terminal and a VRECT terminal of the resonance chip; and

the other end of the seventh resistor is connected to a VRECTS2 terminal and a PVIN terminal of the resonance chip.

20. The wireless charging device of claim 19, wherein the power management module comprises a charging chip, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor, and an eleventh capacitor;

an OUT pin of the charging chip is connected to the battery and is also grounded by means of the tenth capacitor;

a TS pin of the charging chip is grounded by means of the eighth resistor;

a PRE_TERM pin of the charging chip is grounded by means of the ninth resistor;

an ISET pin of the charging chip is grounded by means of the tenth resistor;

a VSS pin of the charging chip is grounded;

an IN pin of the charging chip is connected to the other end of the inductor and one end of the eleventh resistor and is also grounded by means of the eleventh capacitor;

the other end of the eleventh resistor is connected to one end of the twelfth resistor and a master controller; and

the other end of the twelfth resistor is grounded by means of the thirteenth resistor.