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Electric vehicle and its charger and charger control method

A technology of electric vehicles and control methods, which is applied to electric vehicles, current collectors, battery circuit devices, etc., can solve problems such as relay sintering, long pre-charging time, and high current, so as to prevent sintering, reduce pre-charging time, and improve reliability effect

Active Publication Date: 2022-03-18
BYD CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, when precharging in the above way, the required precharging time is longer, resulting in severe heating of the precharging resistor, and the resistance becomes larger, so that the voltage division of the precharging resistor is larger. Therefore, in the system and the precharging A relay connected in parallel with resistors tends to generate a large current when it is pulled in, which in turn leads to sintering of the relay, which greatly affects the reliability of the system

Method used

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  • Electric vehicle and its charger and charger control method
  • Electric vehicle and its charger and charger control method
  • Electric vehicle and its charger and charger control method

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] A charger for an electric vehicle, an electric vehicle, a charger control method for an electric vehicle, a non-transitory computer-readable storage medium, and an electronic device according to embodiments of the present invention are described below with reference to the accompanying drawings.

[0026] figure 1 is a schematic structural diagram of a charger for an electric vehicle according to an embodiment of the present invention. Such as figure 1 As shown, the charger in the embodiment of the present invention may i...

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Abstract

The invention discloses an electric vehicle and its charger and a charger control method, comprising: a pre-charging switch; a pre-charging resistor connected to the pre-charging switch and a first pre-charging capacity; an AC switch; and the AC switch, the pre-charging resistor An AC module connected to the first pre-charging capacitor; a second pre-charging capacitor connected in parallel to the AC module; a low-voltage DC module connected in parallel to the second pre-charging capacitor, the low-voltage DC module is connected to a low-voltage battery pack; a controller for controlling the low-voltage The DC module precharges the second precharging capacitor, and after the voltage of the second precharging capacitor is greater than the first preset threshold and less than the second preset threshold, closes the precharging switch to charge the first precharging capacitor through the power grid. charging, and after the first pre-charging capacitor is pre-charged, close the AC switch. Therefore, the time for precharging can be greatly reduced, thereby effectively avoiding a large current generated when the relay is pulled in, preventing the relay from sintering, and improving the reliability of the system.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a charger for an electric vehicle, an electric vehicle and a charger control method for the electric vehicle. Background technique [0002] With the progress of commercialization of electric vehicles, DC converters and OBC on-board chargers in electric vehicles have gradually become important components in electric vehicles. In the charging system of electric vehicles, the DC converter and the OBC on-board charger can be integrated in a topology, and the pre-charging of the first pre-charging capacitor and the second pre-charging capacitor in the charging system is a system design an essential part of the. [0003] In related technologies, the grid is generally used to precharge the first precharging capacitor and the second precharging capacitor through a precharging resistor. However, when precharging in the above way, the required precharging time is longer, result...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/02
CPCH02J7/02
Inventor 刘坤王兴辉王超张妮
Owner BYD CO LTD
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