LOW-HEAT WIRELESS POWER RECEIVING DEVICE AND METHOD
First Claim
1. A low-heat wireless power receiving device comprising:
- a power receiving coil configured to receive a wireless power signal;
an impedance matching/rectifying unit configured to match impedance so that the power receiving coil can resonate with the wireless power signal and to rectify the wireless power signal to convert it to a DC power;
a charging power supply unit including a low-heat transforming unit and a high-heat transforming unit connected in parallel with each other and supplying an output power of the impedance matching/rectifying unit to a power receiving unit as a charging power;
a current detecting unit configured to detect a current level of a power stored in the power receiving unit; and
a control unit configured to control an impedance matching of the impedance matching/rectifying unit, to determine a charging load state of the power receiving unit in accordance with a time-lapse of charging the power receiving unit and the current level detected by the current detecting unit, and to selectively turn on the low-heat transforming unit and the high-heat transforming unit in accordance with the determined charging load state.
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Accused Products
Abstract
The present invention relates to low-heat wireless power receiving device and method for charging a battery with low heat by receiving a wireless power signal from a wireless power transmitting device. When a power receiving coil receives a wireless power signal, a control unit matches impedance by controlling an impedance matching/controlling unit, determines a charging load state of a power receiving unit in accordance with a time-lapse of charging the power receiving unit and a current level detected by a current detecting unit, and selectively turns on a low-heat transforming unit and a high-heat transforming unit in accordance with the selected charging load state, thereby charging the power receiving unit with minimum heat generation.
8 Citations
15 Claims
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1. A low-heat wireless power receiving device comprising:
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a power receiving coil configured to receive a wireless power signal; an impedance matching/rectifying unit configured to match impedance so that the power receiving coil can resonate with the wireless power signal and to rectify the wireless power signal to convert it to a DC power; a charging power supply unit including a low-heat transforming unit and a high-heat transforming unit connected in parallel with each other and supplying an output power of the impedance matching/rectifying unit to a power receiving unit as a charging power; a current detecting unit configured to detect a current level of a power stored in the power receiving unit; and a control unit configured to control an impedance matching of the impedance matching/rectifying unit, to determine a charging load state of the power receiving unit in accordance with a time-lapse of charging the power receiving unit and the current level detected by the current detecting unit, and to selectively turn on the low-heat transforming unit and the high-heat transforming unit in accordance with the determined charging load state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A low-heat wireless power receiving method comprising:
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matching impedance by controlling an impedance matching/controlling unit by means of a control unit when a wireless power signal is received by a power receiving coil; determining a charging load state of the power receiving unit in accordance with a time-lapse of charging the power receiving unit and a current level detected by a current detecting unit by means of the control unit; and charging the power receiving unit with a charging power based on the wireless power signal by selectively turning on the low-heat transforming unit and the high-heat transforming unit in accordance with the determined charging load state by means of the control unit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification