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Inverter direct-current bus current measuring method and device

A technology of DC bus current and bus current, applied in the direction of measuring device, measuring electrical variable, measuring current/voltage, etc., can solve the problems of underutilization, increased hardware circuit complexity, high cost, and achieve the effect of reducing cost

Inactive Publication Date: 2020-10-13
丰翼科技(深圳)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only does not make full use of the existing motor phase current sampling hardware resources, but also increases the complexity of the hardware circuit and increases the cost

Method used

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  • Inverter direct-current bus current measuring method and device
  • Inverter direct-current bus current measuring method and device
  • Inverter direct-current bus current measuring method and device

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Embodiment Construction

[0026] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0027] It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with embodiments.

[0028] Please refer to figure 1 , figure 1 A schematic flowchart of a method for measuring inverter DC bus current provided by an embodiment of the present application is given.

[0029] Such as figure 1 As shown, the method includes:

[0030] Step 110: Obtain the pulse modulation period T of the inverter p...

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PUM

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Abstract

The invention discloses an inverter linear bus current measurement method and device. The method comprises the steps of obtaining a duty ratio value of each bridge arm of the inverter in a pulse modulation period Tpwm, and obtaining a current value of a first bridge arm with the largest duty ratio value and a current value of a second bridge arm with the smallest duty ratio value in the duty ratiovalues; and calculating an effective value of the direct current bus current by utilizing the current value of the first bridge arm and the current value of the second bridge arm. According to the scheme provided by the invention, the bus current is measured according to the existing motor phase current sampling value and the relationship between the bus current and the motor phase current, the bus current does not need to be collected by adding a hardware circuit, and the cost is further reduced.

Description

Technical field [0001] The present invention generally relates to the technical field of current measurement, in particular to a method and device for measuring inverter DC bus current. Background technique [0002] During the operation of the UAV, the monitoring of the power system status is very important, and the ESC bus current is one of the important indicators of the power system status. The detection of bus current is an indispensable link. The traditional method of detecting the bus current is to add a sampling resistor and cooperate with the corresponding sampling amplifier circuit for sampling. This not only does not make full use of the existing motor phase current sampling hardware resources, but also increases the complexity of the hardware circuit and high costs. Summary of the invention [0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a method for measuring inverter DC bus current. [0004] In the first as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 李林军
Owner 丰翼科技(深圳)有限公司