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DC bus-bar voltage collection circuit for frequency changer

A DC bus voltage and voltage acquisition technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve problems such as poor safety performance, high failure rate, complex voltage acquisition circuit, etc., to improve safety and reliability, and the effect of reducing the failure rate

Inactive Publication Date: 2009-05-27
焦作市明株自动化工程有限责任公司
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AI Technical Summary

Problems solved by technology

[0003] The acquisition technology of the DC bus voltage in the frequency converter is one of the necessary conditions to realize the frequency conversion algorithm. The voltage acquisition circuit is directly connected to the bus voltage. This acquisition method has poor safety performance, the voltage acquisition circuit is very complicated, and the failure rate is high.

Method used

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  • DC bus-bar voltage collection circuit for frequency changer
  • DC bus-bar voltage collection circuit for frequency changer

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Embodiment Construction

[0014] figure 1 It is a schematic diagram of a bus voltage acquisition circuit in the prior art. The voltage acquisition circuit in the prior art is directly connected to the DC bus voltage. There is no isolation measure between the bus voltage loop and the voltage acquisition loop of this circuit, which leads to poor safety and reliability of the voltage acquisition circuit and affects the reliability of the frequency converter.

[0015] figure 2 It is a schematic diagram of the bus voltage acquisition circuit of the present invention. The technical solution provided by the invention is a solution for indirectly collecting bus voltage signals. The present invention utilizes the characteristic that the switching power supply is widely used in frequency converters. In the switching power supply, the bus voltage is sequentially connected to the switching tube and the primary side of the transformer. The switching power supply is a double-tube flyback switching power supply, a...

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Abstract

The invention provides a direct current bus voltage acquisition circuit for a frequency converter. In the bus voltage acquisition circuit, the bus voltage is connected with a primary side of a transformer of a flyback switching power supply, and a voltage acquisition circuit is connected with a secondary side of the transformer by applying a forward mode. The technical proposal of the invention ensures that a direct current bus voltage circuit and the voltage acquisition circuit are isolated, and the isolation directly improves the safety and reliability of an acquisition mode of the bus voltage and also reduces the fault rate of the bus voltage acquisition circuit; and the technical proposal utilizes the characteristic that the switching power supply is universally applied to frequency converters, and the realization of the technical proposal does not need to increase production cost.

Description

technical field [0001] The invention relates to a DC bus voltage acquisition circuit, in particular to a DC bus voltage acquisition circuit used on a frequency converter. Background technique [0002] According to a report by China Jiangxi News Network on November 12, 2007, industrial electricity consumption accounts for 60% of the electricity consumption of the whole society. In the current international and domestic energy shortage situation, reducing the electricity consumption of industrial electrical appliances has become the energy saving of the whole society. The first choice, and frequency conversion technology can realize the energy-saving needs of industrial electrical appliances, this technology can be widely used in industrial electrical products. The frequency conversion technology is characterized by adjusting the power frequency to a continuously adjustable frequency according to the operation requirements of the product, which is suitable for stepless and smo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/335G05F1/10
Inventor 赵辉刘东耀宋青东梁松源靳鞅程道星
Owner 焦作市明株自动化工程有限责任公司
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