Method for vehicle-mounted charger to detect impedance of input line and perform current-limiting protection on input line

A technology for on-board chargers and input lines, applied in battery overcurrent protection, battery overheat protection, safety/protection circuits, etc., can solve problems such as input lines are prone to fire, avoid burning, improve accuracy, and save computing resources Effect

Active Publication Date: 2020-10-30
SHENZHEN VMAX NEW ENERGY CO LTD
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Problems solved by technology

[0004] In order to solve the technical problem in the prior art that the input line of the on-board charger is easy to catch fire in the application scenario of the high-power on-board charger, the present invention proposes a method for the on-board charger to detect the impedance of the input line and limit the current to protect the input line

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  • Method for vehicle-mounted charger to detect impedance of input line and perform current-limiting protection on input line
  • Method for vehicle-mounted charger to detect impedance of input line and perform current-limiting protection on input line
  • Method for vehicle-mounted charger to detect impedance of input line and perform current-limiting protection on input line

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] Thus, a feature indicated in this specification will be used to describe one of the features of an embodiment of the present invention, rather than implying that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes a number of features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly described. Thus, the illustrated combinations are not intended to be limiting unless oth...

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Abstract

The invention discloses a method for a vehicle-mounted charger to detect the impedance of an input line and perform current-limiting protection on the input line, the vehicle-mounted charger receiveselectric energy of a power grid end through the input line, and the method comprises the following steps: sampling the voltage and / or current of the vehicle-mounted charger end of the input line for multiple times before formal charging; calculating the impedance of the input line based on sampling; and based on the impedance of the input line, controlling voltage drop of the input line to limit the current of the input line so that the power of the input line at the time of charging is lower than a safety value. According to the invention, the impedance of the input line is calculated by sampling the voltage and / or current of the vehicle-mounted charger end of the input line for multiple times before formal charging, and then voltage drop of the input line is controlled according to the impedance of the input line, so that the purpose of limiting the current of the input line is achieved. Therefore, the power of the input line is lower than the safety value, excessive heat is prevented from being generated on the input line, and the input line is prevented from being burnt.

Description

technical field [0001] The invention relates to the technical field of electric vehicle on-board power electronics, in particular to a method for an on-board charger to detect the impedance of an input line and limit current to protect the input line. Background technique [0002] The on-board charger receives power from the power grid through the input cable. The input cable is an important accessory for power transmission. Due to the influence of manufacturing level, installation process, site environment and other factors, it is easy to become a weak link in power transmission. For example, the partial discharge of the interface and the aging of the cable insulation will cause additional temperature rise of the cable, and even cause the cable to catch fire and the connector to explode under extreme working conditions, causing personal casualties and economic losses. At the same time, compared with the cable body, the structure of the cable joint is more complicated, and t...

Claims

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Application Information

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IPC IPC(8): H02J7/00G01R31/00G01R27/02G01R27/08B60L53/20B60L53/14B60L53/18
CPCH02J7/00712H02J7/00304H02J7/00309H02J7/0047G01R31/00G01R27/02G01R27/08B60L53/20B60L53/14B60L53/18Y02T10/70Y02T10/7072Y02T90/14
Inventor 冯颖盈姚顺徐金柱胡飞
Owner SHENZHEN VMAX NEW ENERGY CO LTD
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