Pre-charging circuit, pre-charging method, bidirectional direct-current converter and electric vehicle
A bidirectional DC conversion and pre-charging circuit technology, applied in the field of circuits, can solve problems such as low voltage control accuracy and working temperature influence
Active Publication Date: 2021-06-22
UNITED AUTOMOTIVE ELECTRONICS SYST
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Problems solved by technology
[0005] The present invention provides a pre-charging circuit of a bidirectional DC converter, which can realize precise control of charging current and charging voltage, and effectively solve the problems of low voltage control accuracy and Problems with greater influence of operating temperature
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[0030] As mentioned in the background, the bidirectional DC pre-charging circuit in the prior art still has the problems of low voltage control accuracy and great influence of temperature changes. In order to overcome the above problems, the present invention provides a precharging circuit and a precharging method of a bidirectional DC converter, a bidirectional DC converter and an electric vehicle. The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.
[0031] figure 2 It is a working principle diagram of a constant current source charging circuit. refer to figure 2, the c...
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The invention provides a pre-charging circuit, a pre-charging method, a bidirectional direct current converter and an electric vehicle. According to the pre-charging circuit, the charging current in the pre-charging process is modulated through the double rings of a current ring and a voltage ring, surge current can be reduced or avoided, the problem that relative lag exists when current fluctuation is responded only through voltage can be solved, the precision of the output voltage is improved, and the scheme is slightly influenced by temperature factors, the applicable environment temperature range is wide. According to the pre-charging method, the pre-charging circuit is used for pre-charging, a charging diagnosis stage is added before quick charging, abnormal working conditions such as load short circuit can be diagnosed, risks can be recognized in advance, and the charging time can be well controlled. The bidirectional direct-current converter comprises the pre-charging circuit so as to pre-charge a capacitor, especially a high-voltage side parasitic capacitor, and the stability and control precision of charging current and output voltage are improved. The electric vehicle comprises the bidirectional direct-current converter.
Description
technical field [0001] The invention relates to the field of circuits, in particular to a precharging circuit, a precharging method, a bidirectional DC converter and an electric vehicle. Background technique [0002] In response to the national call for energy conservation and emission reduction, improve the energy utilization rate of automobiles and reduce CO 2 Emissions. On the basis of traditional vehicles, hybrid vehicles solve the problem of starting CO2 in traditional vehicles by placing high-voltage batteries (such as 48V batteries) and electric motors. 2 Issues such as excessive emissions and high energy consumption. The battery placed in the hybrid electric vehicle can perform energy recovery and boost start, and its high-voltage level battery and low-voltage level battery (such as 12V battery) energy conversion to achieve energy efficient utilization. Usually, the energy transfer between the 48V battery and the 12V battery requires a direct current DC to direct c...
Claims
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Login to View More IPC IPC(8): B60L3/00H02J7/00
CPCB60L3/003Y02T10/70
Inventor 甘宜洋王小昆崔永生王伟梁东沙孟轲张哲亮
Owner UNITED AUTOMOTIVE ELECTRONICS SYST