Core contactless LLC charger and controlling method thereof
First Claim
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1. An LLC charger, comprising:
- a transmitter-receiver (TX-RX) transformer including a movable matrix core set (MCS), wherein the MCS separably includes a transmitter-MCS (TX-MCS) with plural sub-TX cores and a receiver-MCS (RX-MCS) with plural sub-RX cores, and charges a battery pack with a non-contact power transmission via a resonant magnetic-induction coupling (RMIC) between the TX-MCS and the RX-MCS, all the sub-TX cores are connected to one another in series, and all the sub-RX cores are connected to one another in parallel;
a transmitter including;
an LLC (inductor, inductor, capacitor) power stage; and
the TX-MCS electrically connected to the LLC power stage;
a receiver including;
the RX-MCS; and
a rectifier electrically connected to the RX-MCS.
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Abstract
The configurations of LLC charger and controlling methods thereof are provided. The proposed charger includes a transmitter-receiver (TX-RX) transformer including a TX-matrix core set (TX-MCS) and an RX-MCS, an LLC power stage electrically connected to the TX-MCS, and a rectifier electrically connected to the RX-MCS so as to charge a battery pack with a non-contact power transmission.
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Citations
18 Claims
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1. An LLC charger, comprising:
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a transmitter-receiver (TX-RX) transformer including a movable matrix core set (MCS), wherein the MCS separably includes a transmitter-MCS (TX-MCS) with plural sub-TX cores and a receiver-MCS (RX-MCS) with plural sub-RX cores, and charges a battery pack with a non-contact power transmission via a resonant magnetic-induction coupling (RMIC) between the TX-MCS and the RX-MCS, all the sub-TX cores are connected to one another in series, and all the sub-RX cores are connected to one another in parallel; a transmitter including; an LLC (inductor, inductor, capacitor) power stage; and the TX-MCS electrically connected to the LLC power stage; a receiver including; the RX-MCS; and a rectifier electrically connected to the RX-MCS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
causing the charging current to decrease so as to achieve a trickle charging mode such that the charging current can be automatically regulated to have a safe charging function, and when the battery pack gradually approaches a full capacity, the inner resistance increases, the circuit quality factor Qr decreases, and the LLC charger has an operating point changed from a first one of the intersections to a second one of the intersections on a characteristic curve of Qr of light-load.
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8. The controlling method for the LLC charger according to claim 7, wherein the LLC charger further includes a filter capacitor electrically connected to the rectifier in parallel, the TX-RX transformer further includes an RMIC area and a core loss, the plural sub-TX cores and the plural sub-RX cores are arranged in respective matrices, and the MCS is configured in the TX-RX transformer to relatively increase the RMIC area and decrease the core loss.
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9. The controlling method for the LLC charger according to claim 8, wherein the LLC charger further includes two output terminals and an input power, each the sub-TX core and each the sub-RX core are both wound with at least one winding, the rectifier includes plural rectifying devices, all windings of the sub-TX cores are connected to one another in series to distribute the input power to the sub-TX cores, each winding of each the sub-RX core is electrically connected to a corresponding rectifying device, each winding of each the sub-RX core and the corresponding rectifying device are electrically connected to the two output terminals in parallel to distribute the charging current to each the sub-RX core, and either of each the sub-TX core and each the sub-RX core is one selected from a group consisting of an EE (“
- E”
pattern) core, an EER (“
E”
pattern with round center legs) core and a PQ (Power and Quality) core.
- E”
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10. The controlling method for the LLC charger according to claim 9, wherein the TX-RX transformer is suitable for vehicle-mounted charging, and further includes a primary side and a secondary side, the LLC power stage is an LLC converter, the TX-MCS is the primary side, the primary side and the LLC converter are configured in a piece of equipment, the RX-MCS is the secondary side, the secondary side is configured on a vehicle-mounted system and includes each the sub-RX core and each the rectifying device, and when the vehicle-mounted system requires charging and moves toward the equipment, the RX-MCS and the TX-MCS are aligned automatically, and engage in charging via the RMIC.
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11. The controlling method for the LLC charger according to claim 10, wherein the LLC converter includes a power element, the equipment is configured in one of a fixed position and a non-fixed position, the vehicle-mounted system is one selected from a group consisting of a vehicle, a self-propelled robot, an emergency medical care vehicle, and a wheel chair, the TX-RX transformer further includes plural sub-TX-RX transformers, each the sub-TX-RX transformer has a specific sub-TX core and a corresponding sub-RX core, and each the sub-TX-RX transformer has a turn ratio of (nk=Npk/Nsk)<
- 1, where nk indicates a turn ratio of the kth sub-TX-RX transformer, Npk is a number of turns of the winding of the specific sub-TX core, Nsk is a number of turns of the winding of the specific sub-RX core, and nk<
1 results in a relatively small exciting current on the power element to decrease the core loss.
- 1, where nk indicates a turn ratio of the kth sub-TX-RX transformer, Npk is a number of turns of the winding of the specific sub-TX core, Nsk is a number of turns of the winding of the specific sub-RX core, and nk<
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12. The controlling method for the LLC charger according to claim 11, wherein the LLC charger further includes a receiving terminal, the battery pack is located on the receiving terminal, the LLC converter has a resonant tank and a resonant element, the charging via RMIC requires a primary side resonance to engage in the non-contact power transmission and to charge the battery pack, the inner resistance is reflected to the TX-MCS being the primary side of the TX-RX transformer to serve as a portion of the resonant element, a parasitic capacitance and a leakage inductance generated due to a deviation from one of a parking spot and an installation position of the vehicle-mounted system are totally absorbed into the resonant tank to enable the charging current to be free from a noise interference.
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13. A controlling method for an LLC charger, wherein the LLC charger is the LLC charger as claimed in claim 1, the LLC charger further includes an output current being a charging current, and the battery pack has an inner resistance, comprising
selecting a specific operating frequency for the LLC charger corresponding to a characteristic curve of a given circuit quality factor Qr so as to output a value of the charging current when the LLC charger operates under a variable-frequency control mode; - and causing the LLC charger to automatically regulate the operating frequency according to a state of charge (SOC) of the battery pack on the characteristic curve of the Qr so as to maintain the charging current as a constant current, wherein when the SOC of the battery pack increases, the inner resistance increases, the circuit quality factor Qr decreases, and the LLC charger regulates the operating frequency so as to move an operation point of the LLC charger to a match Qr-given characteristic curve of a relatively heavy load, and to prevent the charging current from decreasing to be maintained at the constant current to achieve a constant current charging mode.
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14. A charger, comprising:
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a transmitter-receiver (TX-RX) transformer including a matrix core set (MCS) separably having a TX-matrix core set (TX-MCS) with plural sub-TX cores and an RX-matrix core set (RX-MCS) with plural sub-RX cores, wherein all the sub-TX cores are connected to one another in series, and all the sub-RX cores are connected to one another in parallel; an LLC (inductor, inductor, capacitor) power stage electrically connected to the TX-MCS; and a rectifier electrically connected to the RX-MCS so as to charge a battery pack with a non-contact power transmission.
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15. A transmitter-receiver (TX-RX) transformer comprising a matrix core set (MCS), wherein the MCS separably includes:
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a transmitter matrix core set (TX-MCS) having plural sub-TX cores; and a receiver matrix core set (RX-MCS) having plural sub-RX cores and generating a resonant magnetic-induction coupling (RMIC) with the TX-MCS so as to output a contactless power, wherein all the sub-TX cores are connected to one another in series, and all the sub-RX cores are connected to one another in parallel. - View Dependent Claims (16, 17, 18)
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Specification