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Method and system for protecting electric vehicle pre-charging circuit

A technology for pre-charging circuits and electric vehicles, applied in electric vehicles, battery circuit devices, circuit devices, etc., can solve problems such as damage to pre-charging resistors, and achieve the effects of ensuring reliable completion, avoiding the reduction of total resistance, and reducing costs

Active Publication Date: 2010-09-22
BEIQI FOTON MOTOR CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The invention provides a method for protecting the pre-charging circuit of an electric vehicle, which can solve the problem of damage to the pre-charging resistor
In addition, the present invention also provides a system for protecting the pre-charging circuit of an electric vehicle, which can solve the problem of damage to the pre-charging resistor in the prior art

Method used

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  • Method and system for protecting electric vehicle pre-charging circuit
  • Method and system for protecting electric vehicle pre-charging circuit
  • Method and system for protecting electric vehicle pre-charging circuit

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Embodiment Construction

[0017] Next, first combine figure 1 The high-voltage electrical schematic diagram and figure 2 The signal diagram of the present invention is used to describe the method for protecting the electric vehicle pre-charging circuit. The method includes: when starting the pre-charging process, keeping the DC / DC converter 102 in an off state, the battery management system BMS 103 closes the pre-charging relay K2 to start charging the capacitor of the inverter 101; when the pre-charging process ends, The BMS 103 opens the pre-charging relay k2 , closes the main contactor K1 ; and starts the DC / DC converter 102 .

[0018] By adopting the described method, since the DC / DC converter 102 is started after the inverter 101 capacitor precharging is completed, it is possible to prevent the DC / DC converter 102 from starting during the precharging process, thereby avoiding the DC / DC The reduction of the total resistance in the circuit caused by the parallel connection of the converter 102 an...

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Abstract

The invention provides a method and a system for protecting an electric vehicle pre-charging circuit, which can solve the problem of pre-charging resistor damage. The method for protecting the electric vehicle pre-charging circuit comprises the following steps that: when a pre-charging process is started, a DC / DC converter remains off, and a battery management system BMS turns off a pre-charging relay so as to start the charging to an inverter capacitor; and when the pre-charging process is over, the BMS disconnects the pre-charging relay and turns off a main contactor; and the DC / DC converter is started. The system for protecting the electric vehicle pre-charging circuit comprises the battery management system BMS which is used for turning off the charging relay when the pre-charging process is started so as to start the charging to the inverter capacitor and disconnecting the pre-charging relay and turning off the main contactor when the pre-charging process is over, and the DC / DC converter which is off when the pre-charging process is started and on when the pre-charging process is over.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to a method and system for protecting a precharging circuit of an electric vehicle. Background technique [0002] With the shortage of global oil resources and the seriousness of environmental pollution, various energy-saving and environmentally friendly new energy vehicles are emerging, especially electric vehicles are getting more and more attention and favor. In the electric vehicle system, the pre-charging management of electric vehicles is an indispensable and important link in new energy vehicles. Among them, the role of electric vehicle pre-charging is to charge the large capacitor of the motor controller (ie, inverter). To reduce spark arcing when the contactor contacts and increase safety. However, in actual use, pre-charging resistor damage failures often occur, which has a negative impact on the reliability and cost of electric vehicles. [0003] Therefore, a method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 邓小明胡浩蔡文远
Owner BEIQI FOTON MOTOR CO LTD
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