A pre-charge control device and method

Abstract

The invention discloses a precharge control device and method. The pre-charging control device includes a resistance pre-charging branch, a linear pre-charging branch and a power supply branch connected in parallel between the battery and the capacitive load; the voltage sampling control module collects the voltage of the battery terminal and the voltage of the capacitive load terminal respectively, and according to the collected The change of the voltage to control the first driving signal, the second driving signal and the third driving signal respectively; the resistance pre-charging branch is turned on or off under the drive of the first driving signal; the linear pre-charging branch is turned on or off under the driving of the second driving signal The power supply branch is turned on or off under the driving of the third driving signal. The pre-charging control device and method of the present invention increase the speed of the pre-charging process and improve the efficiency of the pre-charging.

Description

technical field [0001] The invention relates to the technical field of power supply control, in particular to a pre-charging control device and method. Background technique [0002] Currently, battery-powered mobile devices such as intelligent mobile robots and electric vehicles have been widely used. These devices mostly use higher-voltage batteries to supply power to the load, and when the battery supplies power, an instantaneous large charging current will be generated for the load of the device. For example, for an intelligent mobile robot, it uses a 48V battery to power the entire circuit, and there is a capacitive load with a large capacity. When the battery is powered, a large charging current is generated, which is likely to cause damage to system-related components. In order to solve this problem, a pre-charging control technical solution is proposed in the related art. [0003] Such as figure 1 As shown, the dual-relay resistance scheme can be adopted, in which ...

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Problems solved by technology

[0004] The above scheme adopts the method of sufficient delay, which will cause misjudgment of the damage of the pre-charging resistor module, and cannot guarantee that the pre-charging process can actually be completed. Furthermore, the speed of pre-charging depends entirely on the pre-charging branch. The hardware circuit has poor flexibility for different application situations

Most importantly, if figure 2 As shown in the above solution, as the pre-charging progresses, the rising speed of the voltage becomes slower and slower, resulting in a slower and slower pre-charging speed, which makes the pre-charging efficiency low.

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