Non-contact power charging system and control method thereof based on foreign substance detection
A non-contact power charging, in which power transmission can be interrupted when foreign materials are deposited on a charge plate of the non-contact power charging system. A charging operation can be continuously maintained at a stable voltage even if a non-contact power receiving apparatus moves by touching or displacement on the charge plate of the non-contact power charging system in the charging operation. Charging efficiency is improved.
1. A non-contact power transmitting apparatus comprising:
a primary charge core which generates a magnetic field to wirelessly transmit a power signal to a power receiving apparatus;
a received signal processing module which processes a signal received from the power receiving apparatus and sends the processed signal to a central control unit, the signal including information on a received power of the power receiving apparatus and a request to lower a level of the power signal if any one of voltage and current measured in the receiving apparatus due to the received power is greater than an upper limit of a predetermined range, and a request to raise a level of the power signal if anyone of voltage and current measured in the receiving apparatus due to the received power is less than a lower limit of the predetermined range;
a central control unit which interrupts or suspends charging operation of the non-contact power transmitting apparatus if a loss in the power signal is detected due to changes of the magnetic field by a foreign substance, wherein the central control unit determines the loss based on changes in a load on the primary charge core caused by the foreign substance; and
wherein the central control unit is to increase or decrease the level of the power signal in response to the request to maintain a stable power level at the power receiving apparatus during battery charging.
2. The apparatus of claim 1 , wherein the central control unit further interrupts or suspends the charging operation based on a temperature in the non-contact power transmitting apparatus.
3. The apparatus of claim 1 , further comprising:
a display module which is to display a foreign substance error.
4. The apparatus of claim 1 , wherein when the charging operation is interrupted or suspended, the non-contact power transmitting apparatus remains in a standby mode.
5. The apparatus of claim 4 , wherein the non-contact power transmitting apparatus remains in a standby mode until a restarting signal is inputted from a user.
6. A method of controlling a non-contact power transmission apparatus, the method comprising:
generating a magnetic field to wirelessly transmit a power signal to a power receiving apparatus;
processing a signal received from the power receiving apparatus, the signal including information on a received power of the power receiving apparatus and a request to lower a level of the power signal if any one of voltage and current measured in the receiving apparatus due to the received power is greater than an upper limit of a predetermined range, and a request to raise a level of the power signal if anyone of voltage and current measured in the receiving apparatus due to the received power is less than a lower limit of the predetermined range;
determining whether a loss in the power signal is detected due to changes of the magnetic field by a foreign substance, wherein the determining whether a loss in the power signal is detected is based on changes in a load on the primary charge core caused by the foreign substance;
increasing or decreasing the level of the power signal in response to the request to maintain a stable power level at the power receiving apparatus during battery charging; and
interrupting or suspending charging operation of the non-contact power transmission apparatus if the loss in the power signal is detected.
7. The method of claim 6 , wherein the charging operation is further interrupted or suspended based on a temperature in the non-contact power transmission apparatus.
8. The method of claim 6 , further comprising:
displaying a foreign substance error.
9. The method of claim 6 , wherein when the charging operation is interrupted or suspended, the non-contact power transmitting apparatus remains in a standby mode.
10. The method of claim 9 , wherein the non-contact power transmitting apparatus remains in a standby mode until a restarting signal is inputted from a user.