Contactless battery charger
First Claim
1. A contactless battery charger for use in a communication terminal, comprising:
- a converter including a primary side of a printed circuit board (PCB) transformer, the converter converting a commercial electric power to a high-frequency square wave, applying the converted high-frequency square wave to the primary side of the PCB transformer, and controlling generation of a charge current depending on charge state information provided; and
a charging unit including a secondary side of the PCB transformer, the charging unit converting an electromotive force induced at the secondary side of the PCB transformer by a magnetic field generated by the square wave applied to the primary side of the PCB transformer to a DC (Direct Current) voltage, charging a rechargeable battery with the DC voltage, and providing the charge state information to the converter.
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Accused Products
Abstract
Disclosed is a contactless battery charger that avoids contact failure between a battery pack and the battery charger including a converter and a charging unit. A converter includes a primary side of a printed circuit board (PCB) transformer. The converter converts a commercial electric power to a high-frequency square wave, applies the converted high-frequency square wave to the primary side of the PCB transformer, and controls generation of a charge current depending on charge state information provided. A charging unit includes a secondary side of the PCB transformer. The charging unit converts to a DC voltage an electromotive force induced at the secondary side of the PCB transformer by a magnetic field generated by the square wave applied to the primary side of the PCB transformer, charges a rechargeable battery with the DC voltage, and provides the charge state information to the converter.
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Citations
11 Claims
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1. A contactless battery charger for use in a communication terminal, comprising:
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a converter including a primary side of a printed circuit board (PCB) transformer, the converter converting a commercial electric power to a high-frequency square wave, applying the converted high-frequency square wave to the primary side of the PCB transformer, and controlling generation of a charge current depending on charge state information provided; and
a charging unit including a secondary side of the PCB transformer, the charging unit converting an electromotive force induced at the secondary side of the PCB transformer by a magnetic field generated by the square wave applied to the primary side of the PCB transformer to a DC (Direct Current) voltage, charging a rechargeable battery with the DC voltage, and providing the charge state information to the converter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A contactless battery charger comprising:
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a converter including;
a primary side of a PCB transformer;
a rectifying circuit for converting a commercial electric power to a DC voltage;
an inverter for converting the DC voltage to a high-frequency square wave and providing the converted high-frequency square wave to the primary side of the PCB transformer;
a photo-coupler receiver for converting a received light beam to an electric signal;
a controller for recognizing a specification and a charged state of a rechargeable battery based on the electric signal provided from the photo-coupler receiver, and generating charge control data according to the recognized results;
an inverter controller for controlling a charge current by controlling a frequency of the square wave output from the inverter based on the charge control data from the controller;
a charging unit including;
a rectifying circuit for converting an electromotive force induced at a secondary side of the PCB transformer by a magnetic field generated at the primary side of the PCB transformer to a DC voltage; and
a monitoring circuit and photo-coupler transmitter connected to the rectifying circuit and the rechargeable battery, for detecting a voltage level of the rechargeable battery while the rechargeable battery is charged, and radiating a light beam according to the detected results.
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Specification