Charging device, method for controlling charging of charging device, and vehicle
AssigneeBYD Company Limited
InventorsWeidong Liu, Chao Wang, Xinghui Wang
Life of this patent
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Abstract
A charging device includes a first DC convertor and controller. The first DC convertor is configured to convert a DC signal outputted by a power battery to a DC signal required for a storage battery. The first DC convertor includes a first half-bridge logical link control (LLC) circuit and a second half-bridge LLC circuit arranged in parallel. The controller is connected with the first half-bridge LLC circuit and the second half-bridge LLC circuit and configured to acquire a total output current of the first DC convertor, and control the first half-bridge LLC circuit and the second half-bridge LLC circuit to operate alternately when the total output current is less than a current threshold.
Claims12
A charging device, comprising:
- a first DC convertor, configured to convert a DC signal outputted by a power battery to a DC signal required for a storage battery, wherein the first DC convertor comprises a first half-bridge logical link control (LLC) circuit and a second half-bridge LLC circuit arranged in parallel;
- a controller, connected with the first half-bridge LLC circuit and the second half-bridge LLC circuit and configured to acquire a total output current of the first DC convertor, and control the first half-bridge LLC circuit and the second half-bridge LLC circuit to operate alternately when the total output current is less than a current threshold;
- a second filter, wherein a first terminal of the second filter is connected with an AC power supply;
- a power factor correction (PFC) circuit, configured to perform a PFC on an input AC and output a DC signal after the PFC, wherein the PFC circuit comprises at least three-phase bridge arms;
- and each phase bridge arm is connected with a second terminal of the second filter through a power inductor;
- and
- a second DC convertor, wherein an input terminal of the second DC convertor is connected with an output terminal of the PFC circuit;
- and an output terminal of the second DC convertor is connected with the power battery.
A charging device, comprising:
- a first DC convertor, configured to convert a DC signal outputted by a power battery to a DC signal required for a storage battery, wherein the first DC convertor comprises a first half-bridge logical link control (LLC) circuit and a second half-bridge LLC circuit arranged in parallel;
- and
- a controller, connected with the first half-bridge LLC circuit and the second half-bridge LLC circuit and configured to acquire a total output current of the first DC convertor, and control the first half-bridge LLC circuit and the second half-bridge LLC circuit to operate alternately when the total output current is less than a current threshold,
- wherein the first half-bridge LLC circuit comprises:
- a first switching transistor and a second switching transistor, wherein a first terminal of the first switching transistor is connected with a first terminal of the power battery;
- a second terminal of the first switching transistor is connected with a first terminal of the second switching transistor;
- a control terminal of the first switching transistor is connected with the controller;
- a second terminal of the second switching transistor is connected with a second terminal of the power battery;
- a control terminal of the second switching transistor is connected with the controller;
- and a first node is arranged between the second terminal of the first switching transistor and the first terminal of the second switching transistor;
- a first capacitor and a first inductor, wherein a first terminal of the first capacitor is connected with the first node;
- and a second terminal of the first capacitor is connected with a first terminal of the first inductor;
- a first transformer, wherein the first transformer comprises a first primary coil, a first secondary coil, and a second secondary coil;
- a first terminal of the first primary coil is connected with a second terminal of the first inductor;
- a second terminal of the first primary coil is connected with a second terminal of the second switching transistor;
- a second terminal of the first secondary coil and a first terminal of the second secondary coil are connected as a first common terminal;
- and the first common terminal is connected with a second terminal of the storage battery;
- and
- a third switching transistor and a fourth switching transistor, wherein a first terminal of the third switching transistor is connected with a first terminal of the first secondary coil;
- a second terminal of the third switching transistor is connected with a first terminal of the storage battery;
- a control terminal of the third switching transistor is connected with the controller;
- a first terminal of the fourth switching transistor is connected with a second terminal of the second secondary coil;
- a second terminal of the fourth switching transistor is connected with the second terminal of the third switching transistor and the first terminal of the storage battery;
- and a control terminal of the fourth switching transistor is connected with the controller.
A method for controlling charging of a charging device, the charging device having a first DC convertor comprising a first half-bridge LLC circuit and a second half-bridge LLC circuit arranged in parallel, and configured to convert a DC signal outputted by a power battery to a DC signal required for a storage battery, a second filter, wherein a first terminal of the second filter is connected with an AC power supply, a power factor correction (PFC) circuit, configured to perform a PFC on an input AC and output a DC signal after the PFC, wherein the PFC circuit comprises at least three-phase bridge arms;
- and each phase bridge arm is connected with a second terminal of the second filter through a power inductor;
- and a second DC convertor, wherein an input terminal of the second DC convertor is connected with an output terminal of the PFC circuit;
- and an output terminal of the second DC convertor is connected with the power battery, the method comprising:
- acquiring a total output current of the first DC convertor;
- determining whether the total output current is less than a current threshold;
- and
- controlling the first half-bridge LLC circuit and the second half-bridge LLC circuit to operate alternately when the total output current is less than the current threshold.
Dependencies are inferred from the claim text.