No point of contact charging system
First Claim
1. A non-contact charging system having a battery pack (B) charged by an induced electromotive force generated from a non-contact charger (A) supplied with power, wherein the non-contact charger (A) comprises:
- an electromagnetic wave filter (100) connected to a power input terminal to block electromagnetic waves caused by Alternating Current (AC) power;
a primary rectification circuit (110) for rectifying the AC power, to Direct Current (DC) power;
a flyback converter (110′
) for storing power transferred from the primary rectification circuit (110) while a contained transistor is turned on, and applying an input voltage to a gate driver (160), a central processing unit (180) and applying a driving voltage to a series resonance type converter (120) when the contained transistor is turned off;
a current detection unit (170) interposed between the flyback converter (110′
) and the series resonance type converter (120) to detect a variation in current resulting from an approach of the battery pack (B) to a non-contact charging pad, and outputting a comparison current depending on the variation in current;
the central processing unit (180) for detecting the approach of the battery pack (B) using the comparison current output from the current detection unit (170), controlling the gate drive (160) according not only to whether the battery pack (B) approaches but also to the current of a temperature protection circuit unit (183) to stop the switching of the gate drive (160) when abnormal operation occurs or the temperature of a foreign object placed on the non-contact charging pad exceeds a predetermined temperature;
the gate driver (160) for outputting gate signals under the control of the central processing unit (180);
the series resonance type converter (120) for adjusting the waveforms of voltage and current applied to a primary core unit (130) in response to the gate signals input from the gate driver (160); and
the primary core unit (130) switched by the series resonance type converter (120) to generate the induced electromotive force,wherein the battery pack (B) comprises;
a secondary core unit (210) configured to induce power through the primary core unit (130);
a secondary rectification circuit unit (200) coupled to a coil (Scoil1) of the secondary core unit (120) to rectify the induced power;
a charging control unit (230) comprising a charging adjustment circuit (230a) for supplying a fuel gauge (230b) with power rectified by the secondary rectification circuit (200), and applying voltage to a Radio Frequency Identification (RFID) control unit in response to the output of the secondary rectification circuit (200), and the fuel gauge (210b) for supplying a battery BAT through a protection circuit (240) with power supplied from the charging adjustment circuit (230a), and generating charging state information and periodically records the information while monitoring the charging state of the battery BAT; and
a protection circuit unit (240) coupled between the charging control unit (230) and the battery (BAT) to control whether to perform charging or discharging depending on a charged state of the battery (BAT), anda shield plate (260) having a film shape, interposed between the secondary core unit (210) of the battery pack (B) and a battery case (250), the protection circuit unit (240) being surrounded by a shield member (241).
2 Assignments
0 Petitions
Accused Products
Abstract
Disclosed herein is a non-contact charging system. The non-contact charging system detects a portable terminal, a battery pack or a foreign object that is placed on the pad of a non-contact charger, and effectively monitors and controls its charging state through the detection, thus preventing such a foreign object placed on the pad from being heated by induction heating, and further causes anions to be generated during the charging of the portable terminal or the battery pack, thus sterilizing bacteria on a terminal and keeping ambient air thereof fresh.
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Citations
35 Claims
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1. A non-contact charging system having a battery pack (B) charged by an induced electromotive force generated from a non-contact charger (A) supplied with power, wherein the non-contact charger (A) comprises:
- an electromagnetic wave filter (100) connected to a power input terminal to block electromagnetic waves caused by Alternating Current (AC) power;
a primary rectification circuit (110) for rectifying the AC power, to Direct Current (DC) power;
a flyback converter (110′
) for storing power transferred from the primary rectification circuit (110) while a contained transistor is turned on, and applying an input voltage to a gate driver (160), a central processing unit (180) and applying a driving voltage to a series resonance type converter (120) when the contained transistor is turned off;
a current detection unit (170) interposed between the flyback converter (110′
) and the series resonance type converter (120) to detect a variation in current resulting from an approach of the battery pack (B) to a non-contact charging pad, and outputting a comparison current depending on the variation in current;
the central processing unit (180) for detecting the approach of the battery pack (B) using the comparison current output from the current detection unit (170), controlling the gate drive (160) according not only to whether the battery pack (B) approaches but also to the current of a temperature protection circuit unit (183) to stop the switching of the gate drive (160) when abnormal operation occurs or the temperature of a foreign object placed on the non-contact charging pad exceeds a predetermined temperature;
the gate driver (160) for outputting gate signals under the control of the central processing unit (180);
the series resonance type converter (120) for adjusting the waveforms of voltage and current applied to a primary core unit (130) in response to the gate signals input from the gate driver (160); and
the primary core unit (130) switched by the series resonance type converter (120) to generate the induced electromotive force,wherein the battery pack (B) comprises; a secondary core unit (210) configured to induce power through the primary core unit (130);
a secondary rectification circuit unit (200) coupled to a coil (Scoil1) of the secondary core unit (120) to rectify the induced power;
a charging control unit (230) comprising a charging adjustment circuit (230a) for supplying a fuel gauge (230b) with power rectified by the secondary rectification circuit (200), and applying voltage to a Radio Frequency Identification (RFID) control unit in response to the output of the secondary rectification circuit (200), and the fuel gauge (210b) for supplying a battery BAT through a protection circuit (240) with power supplied from the charging adjustment circuit (230a), and generating charging state information and periodically records the information while monitoring the charging state of the battery BAT; and
a protection circuit unit (240) coupled between the charging control unit (230) and the battery (BAT) to control whether to perform charging or discharging depending on a charged state of the battery (BAT), anda shield plate (260) having a film shape, interposed between the secondary core unit (210) of the battery pack (B) and a battery case (250), the protection circuit unit (240) being surrounded by a shield member (241). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- an electromagnetic wave filter (100) connected to a power input terminal to block electromagnetic waves caused by Alternating Current (AC) power;
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10. A charger for wirelessly charging an electronic device placed on a charging pad of the charger, comprising:
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a first and a second terminals that receive a DC voltage signal therebetween; a converter to adjust the DC voltage signal and provide a switching signal to a primary core unit to generate an induced electromotive force for transmission to the electronic device; a sensor unit interposed between the first terminal and the converter to sense a variation in one of a voltage and a current between the first terminal and the converter to generate a comparison current based on the sensed variation; and a processing unit configured to detect an approach of an external object based on the value of the comparison current, wherein the processing unit is configured to measure the value of the comparison current when no object is placed on the charging pad, and stores the value of the comparison current as a reference current value, wherein the processing unit is configured to detect a change in the comparison current, the change in the comparison current being triggered by placing an external object on the charging pad; and
wherein the processing unit is configured to obtain a value of the comparison current as an object-presented current value in response to the change in the comparison current, and wherein the processing unit is configured to, in response to a detection of the change in the comparison current by the processing unit, compare the reference current value with the object-presented current value, determine whether the reference current value is less than the object-presented current value, and decide a type of the external object in response to an outcome of the comparison. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of wirelessly charging an electronic device placed on a charging pad of a wireless charger, comprising:
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receiving a DC voltage signal between a first and a second terminals; converting the DC voltage signal by a converter and providing a switching signal to a primary core unit to generate an induced electromotive force for transmission to the electronic device; sensing a variation in one of a voltage and a current between the first terminal and the converter and generating a comparison current based on the sensed variation of the voltage or the current; memorizing the value of the comparison current as a reference current value; detecting a change in the value of the comparison current being triggered by placing an external object on the charging pad; in response to the change in the comparison current, obtaining a value of the comparison current as an object-presented current value; comparing the reference current value with the object-presented current value, and determining whether the reference current value is less than the object-presented current value; and
deciding a type of the external object in response to the comparison. - View Dependent Claims (21, 22, 23)
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24. An electronic device, comprising:
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a battery cell; an induction coil configured to generate a power signal from a magnetic field applied thereto; a rectification unit configured to rectify the power signal to generate a rectified power signal; a foreign object indication unit having a switch, the foreign object indication unit being configured to receive the rectified power signal and transfer the rectified power signal to a charging control unit through the switch; and the charging control unit configured to process the power signal to charge the battery cell with the processed power signal, wherein the foreign object indication unit is configured to control an on/off state of the switch in response to an instantaneous input of the rectified power, and wherein the foreign object indication unit turns off the switch in response to start of an input of the rectified power signal to disable the transfer of the rectified power signal to the charging control unit. - View Dependent Claims (25, 26, 27)
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28. A battery pack, comprising:
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a battery cell; an induction coil configured to generate a power signal from a magnetic field applied thereto; a rectification unit configured to rectify the power signal to generate a rectified power signal; a foreign object indication unit having a switch, the foreign object indication unit being configured to receive the rectified power signal and transfer the rectified power signal to a charging control unit through the switch; and the charging control unit configured to process the power signal to charge the battery cell with the processed power signal, wherein the foreign object indication unit is configured to control an on/off state of the switch in response to an instantaneous input of the rectified power, and wherein the foreign object indication unit turns off the switch in response to start of an input of the rectified power signal to disable the transfer of the rectified power signal to the charging control unit. - View Dependent Claims (29, 30, 31)
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32. A method of wirelessly charging a battery pack comprising:
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generating a power signal from an induction coil to an externally applied magnetic field; rectifying the power signal to generate a rectified power signal; transferring the rectified power signal to a charging control unit through a switch of a foreign object indication unit; and processing the power signal to charge a battery cell with the processed power signal; wherein an on/off state of the switch is controlled in response to an instantaneous input of the rectified power, and wherein the switch is turned off in response to a start of an input of the rectified power signal to disable the transfer of the rectified power signal to the charging control unit. - View Dependent Claims (33, 34, 35)
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Specification