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Method and device for detecting state of power unit fuse

A technology of power unit and detection device, applied in the direction of measuring device, instrument, measuring electricity, etc., can solve the problems of high voltage, excessive electric gap of detection circuit, overvoltage impact of fuse arc, etc., and achieve the effect of low cost

Active Publication Date: 2011-08-17
维谛新能源有限公司
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Problems solved by technology

[0012] However, the problem with this method is that when the fuse is blown suddenly, an arc overvoltage impact will appear at both ends of the fuse, which will cause the detection circuit to have too large a gap. Therefore, this method is generally suitable for low-voltage occasions. High voltage or high voltage occasions are not applicable due to high voltage

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  • Method and device for detecting state of power unit fuse
  • Method and device for detecting state of power unit fuse
  • Method and device for detecting state of power unit fuse

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Embodiment Construction

[0046] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0047] see Figure 5 , which is a flow chart of Embodiment 1 of a method for detecting a state of a fuse of a power unit provided by the present invention.

[0048] The method for detecting the state of a power unit fuse provided in this embodiment includes:

[0049] S501: detecting the DC bus voltage of the power unit;

[0050] It can be understood that a power unit generally refers to a combination of a rectification unit and an inverter unit in a frequency converter or a converter. The DC bus voltage refers to the output voltage of the rectifier unit. The rectifier unit can be a single-phase rectifier unit or a three-phase rectifier unit, and each rectifier unit can be an uncontrollable rectifier unit composed of diodes or an IGBT...

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Abstract

The invention provides a method and a device for detecting state of a power unit fuse. Whether the fuse is fused is judged by detecting a direct current bus voltage in a power unit; and because the direct fusing reason of the fuse in the power unit is over current on the fuse and the over current is generated by short-circuit, no matter the output side of the power unit is short-circuited, or a rectifying unit is short-circuited, or the bus is directly short-circuited, quick drop of the direct current bus voltage is caused. Therefore, the method and the device for judging the state of the fuse by detecting the direct current bus voltage are very reliable. A device for detecting the direct current bus voltage is arranged in the common power unit, so the method has no requirement for the fuse, does not need to detect the voltages at two ends of the fuse, is simple and reliable, has low cost, and is suitable for occasions of medium voltage and high voltage.

Description

technical field [0001] The invention relates to the technical field of power electronics detection, in particular to a method and device for detecting the state of a power unit fuse. Background technique [0002] In the medium-voltage or high-voltage cascaded converters, cascaded power units are included, and the three-phase AC input of each power unit needs to be protected by fuses. The fuse is a current protector made by using the principle of breaking the circuit by melting the melt with the heat generated by itself after the current exceeds the specified value for a period of time. [0003] see figure 1 , which is a topological diagram of a converter power unit in the prior art. [0004] The three-phase AC input is A-phase, B-phase and C-phase respectively, and fuses are connected in series on A-phase and C-phase. [0005] During the operation of the converter, it is necessary to detect the fusing state of the fuse. If the fuse is blown, report the blown state to the...

Claims

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Application Information

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IPC IPC(8): G01R31/07G01R31/74
Inventor 蹇龙飞赵敬辉
Owner 维谛新能源有限公司
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