WIRELESS CHARGING SYSTEM

• US 20130082649A1
• Filed: 09/14/2012
• Published: 04/04/2013
• Est. Priority Date: 09/30/2011
• Status: Abandoned Application

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Eung J.U. Kim, Hyun Seok Lee, Sam K.I. Jung, Young Seok Yoon
• Inventors: LEE, Hyun Seok, KIM, Eung Ju, YOON, Young Seok, JUNG, Sam Ki
• Application Number:
  US13/619,857
• Publication Number:
  US 20130082649A1
• Time in Patent Office: Days
• US Class Current: 320/108
• 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 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

Disclosed herein is a wireless charging system that includes a transmission device including a primary coil and a reception device including a secondary coil, wherein the transmission device detects an input signal provided from the primary coil to generate an output signal in the form of a pulse, and compares the level of the generated output signal with a reference voltage to generate a detection signal for determining the presence or absence of the reception device. The wireless charging system does not require an analog-to-digital converter (ADC), eliminating the necessity of using an ADC chip or a high-priced control circuit including an ADC block, thus reducing a material cost of the system. In addition, since the wireless charging system does not require a software algorithm for processing an ADC signal, the performance can be improved.

Claims

1. A wireless charging system that includes a transmission device including a primary coil and a reception device including a secondary coil,

wherein the transmission device detects an input signal provided from the primary coil to generate an output signal in the form of a pulse, and compares the level of the generated output signal with a reference voltage to generate a detection signal for determining the presence or absence of the reception device.

2. The wireless charging system according to claim 1, wherein the transmission device includes:

a power amplifier driving unit providing power to the primary coil;

a controller controlling the power amplifier driving unit in response to the detection signal; and

a detection unit generating the detection signal and providing the generated detection signal to the controller.

3. The wireless charging system according to claim 2, wherein the detection unit includes:

a level determining unit detecting the input signal to generate the output signal in the form of a pulse; and

a comparison unit comparing the level of the output signal with a reference voltage and, generating the detection signal for determining the presence or absence of the reception device.

4. The wireless charging system according to claim 3, wherein the detection unit further includes:

an isolation unit connected with a front stage of the level determining unit and preventing interference with the power amplifier driving unit due to an introduction of the input signal.

5. The wireless charging system according to claim 3, wherein the level determining unit is a limiter circuit including first and second diodes connected in parallel in different directions.

6. The wireless charging system according to claim 5, wherein bias voltages each having a different level are applied to the first and second diodes, respectively.

7. A wireless charging system that includes a transmission device including a primary coil and a reception device including a secondary coil,

wherein the transmission device includes:

a power source unit generating charging power by using an external power source;

a power amplifier (PA) driving unit amplifying a high frequency from the charging power generated by the power source unit;

a detection unit detecting an input signal provided from the primary coil to generate an output signal in the form of a pulse, and compares the level of the generated output signal with a reference voltage to generate a detection signal for determining the presence or absence of the reception device; and

a controller generating a control signal for driving the PA driving unit in response to the detection signal provided from the detection unit.

8. The wireless charging system according to claim 7, wherein the detection unit includes:

a level determining unit detecting the input signal to generate the output signal in the form of a pulse; and

a comparison unit comparing the level of the output signal with a reference voltage and generating the detection signal for determining the presence or absence of the reception device.

9. The wireless charging system according to claim 8, wherein the detection unit further includes:

an isolation unit connected with a front stage of the level determining unit and preventing interference with the power amplifier driving unit due to an introduction of the input signal.

10. The wireless charging system according to claim 8, wherein the level determining unit is a limiter circuit including first and second diodes connected in parallel in different directions.

11. The wireless charging system according to claim 10, wherein bias voltages each having a different level are applied to the first and second diodes, respectively.