Bidirectional charging circuit of electric automobile, control method and control equipment of bidirectional charging circuit, and automobile
A charging circuit, electric vehicle technology, applied in the direction of electric vehicle charging technology, electric vehicle, battery circuit device, etc., can solve the problem of ECU or vehicle charger semiconductor damage and other problems
Active Publication Date: 2020-12-04
BEIJING ELECTRIC VEHICLE
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Problems solved by technology
[0003] Embodiments of the present invention provide a bidirectional charging circuit for an electric vehicle, its control method, control equipment, and the vehicle, to solve the problem that the large current generated at the moment of power-on easily damages the semiconductors inside the ECU or the on-board charger
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Embodiment Construction
[0041] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0042] In an electric vehicle, an on-board charger 14 , a DCDC converter, an electronic control unit ECU 13 , a power battery 12 and a storage battery 11 are usually provided. Wherein, the output end of the on-board charger 14 and the input end of the ECU 13 on the high-voltage bus are connected in parallel to the port of the power battery 12 . The on-board charger 14 can convert the grid-side alternating current into direct current to charge the power battery 12 .
[0043] On the AC input side of the on-board charger 14, the input side of the DCDC converter and the port of the power battery 12, a soft start circuit composed of a relay and a resistor is provided. The function of the soft start circuit is to avoid the large current generated at the m...
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The invention provides a bidirectional charging circuit of an electric automobile, a control method and control equipment of the bidirectional charging circuit, and the automobile, the bidirectional charging circuit comprises a vehicle-mounted charger, the vehicle-mounted charger is connected to a power battery through a high-voltage busbar, wherein the high-voltage busbar is also connected with at least one ECU; and a storage battery connected to the high-voltage busbar through a bidirectional DCDC conversion circuit, wherein the positive electrode of the power battery is connected with a first line in the high-voltage busbar through a first switch, the negative electrode of the power battery is connected with a second line in the high-voltage busbar through a second switch, and the bidirectional DCDC conversion circuit comprises a high-voltage circuit part, a low-voltage circuit part and a coupling circuit connected with the high-voltage circuit part and the low-voltage circuit part.According to the invention, by means of the bidirectional charging circuit, a storage battery can pre-charge the capacitor of ECU and the capacitor in a vehicle-mounted charger, so that the problem that the ECU or a semiconductor in the vehicle-mounted charger is prone to being damaged by large current generated at the moment of power-on is effectively solved.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a bidirectional charging circuit of the electric vehicle, a control method thereof, a control device and the vehicle. Background technique [0002] In electric vehicles, there is a soft start circuit composed of relays and resistors on the AC input side of the on-board charger, the input side of the DCDC converter, and the port of the power battery. The semiconductor inside the machine, DCDC converter, electronic control unit (Electronic Control Unit, referred to as ECU), etc. is damaged. However, the soft start circuit has the following defects: the addition of additional devices, power resistors, relays, and relay drive circuits lead to higher costs; Electric corrosion, poor contact contact or contact adhesion; the resistors used are generally cement resistors and thermistors. Long-term use of these two resistors will cause performance aging problems and affect syste...
Claims
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Login to View More IPC IPC(8): H02J7/02H02J7/00B60L53/00
CPCH02J7/0013B60L53/00Y02T10/70Y02T10/7072Y02T90/14
Inventor 闫泽宇赵春阳肖胜然蒋荣勋
Owner BEIJING ELECTRIC VEHICLE