DC power supply circuit, its voltage fluctuation processing method, device and controller

A technology of DC power supply and voltage fluctuation, applied in the field of electric power, can solve problems such as failure of the main circuit to be disconnected in time, potential safety hazards, and adhesion of DC contactors.

Active Publication Date: 2021-05-07
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the operation of the system, due to the different control logics of the battery management systems (BMS) of different manufacturers, the high-voltage contactor powering the air conditioner may disconnect and then quickly engage, or some The abnormal phenomenon causes the high-voltage contactor to be disconnected and then quickly closed
At this time, due to the slow discharge of the large-capacity capacitor inside the air conditioner, when the original power supply voltage V1 drops to a certain voltage V2, the main circuit cannot be disconnected in time. When the power supply output high-voltage contactor pulls in again, A V1-V2 pressure difference will be generated in the loop system. When the pressure difference reaches a certain level, an inrush current will be generated due to a sudden change in voltage, which will burn the fuse or cause the DC contactor to stick, leaving a potential safety hazard.

Method used

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  • DC power supply circuit, its voltage fluctuation processing method, device and controller
  • DC power supply circuit, its voltage fluctuation processing method, device and controller

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Embodiment 1

[0021] An embodiment of the present invention provides a method for processing voltage fluctuations in a DC power supply circuit, such as figure 1 As shown, the method includes:

[0022] S110, monitoring the input voltage of the electrical load in the DC power supply circuit.

[0023] The inventors of the present application found through a large amount of experimental data that the DC power supply circuit, such as the DC power supply circuit used in the new energy vehicle air conditioner, the voltage fluctuation during the operation of the air conditioner mainly occurs when the power is output to the air conditioner. When the high-voltage contactor on the side is disconnected and then closed, or there is a situation in which the voltage drops sharply and then rises during operation. The latter causes voltage fluctuations to occur more frequently. The potential safety hazards to the DC power supply circuit are more obvious.

[0024] Therefore, in order to be able to judge i...

Embodiment 2

[0041] In order to cooperate with the implementation of the above-mentioned voltage fluctuation processing method in the DC power supply circuit, an embodiment of the present invention provides a voltage fluctuation processing device in the DC power supply circuit, such as figure 2 As shown, the device includes:

[0042] A monitoring module 210, configured to monitor the input voltage of the electrical load in the DC power supply circuit;

[0043] The control module 220 is configured to control and shut down the power supply in the DC power supply circuit according to the drop speed of the input voltage.

[0044] In a specific embodiment, the monitoring module 210 is specifically used for monitoring the input voltage in real time, and calculating the first falling slope of the input voltage over time; the control module 220 is specifically used for if the first falling slope of the input voltage is greater than a given If the descending slope is lower, the power supply in th...

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Abstract

The embodiment of the present application provides a DC power supply circuit, its voltage fluctuation processing method, device and controller, which relate to the field of electric power technology, by monitoring the input voltage of the electric load in the DC power supply circuit; The power supply in the DC power supply circuit is used to avoid the inrush current that may be generated when the input voltage of the electrical load rises again after a sharp drop, thereby reducing the probability of various safety hazards caused by the inrush current.

Description

technical field [0001] The application belongs to the field of electric power technology, and in particular relates to a DC power supply circuit, a voltage fluctuation processing method, device and controller thereof. Background technique [0002] At present, in a high-voltage DC circuit system, such as a high-voltage DC power supply system used in a vehicle air conditioner, there will be a large number of capacitive loads. The moment the high-voltage circuit is closed, because the voltage across the capacitor is zero, a huge surge current will be generated at the moment the circuit is closed, especially when the car air conditioner contains a large-capacity filter capacitor, the surge current can even reach more than 100A-1000A. In severe cases, it may cause high-voltage circuit fuses to blow or DC contactor contacts to stick. Therefore, the usual practice is to design a pre-charging circuit to prevent instantaneous inrush current, that is, connect a pre-charging contactor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262H02H7/263H02H7/268
Inventor 李俊彦龙运林宇文超敏梁晓华雷龙黄瀑高小丽
Owner GREE ELECTRIC APPLIANCES INC
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