Safety control method of system having precharging circuit, safety control device of system having precharging circuit, and system with safety control device

A pre-charging circuit and safety control technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as inverter damage and achieve cost-saving effects

Active Publication Date: 2014-03-26
SCHNEIDER TOSHIBA INVERTER EUROPE SAS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] - When this condition occurs, the inverter will be permanently damaged

Method used

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  • Safety control method of system having precharging circuit, safety control device of system having precharging circuit, and system with safety control device
  • Safety control method of system having precharging circuit, safety control device of system having precharging circuit, and system with safety control device
  • Safety control method of system having precharging circuit, safety control device of system having precharging circuit, and system with safety control device

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Embodiment Construction

[0036] The present invention will be fully described below with reference to the accompanying drawings showing embodiments of the invention. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in idealized or extremely formalized meanings, unless explicitly stated herein defined in thi...

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PUM

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Abstract

The objective of the invention is to ensure the safety of a device so as to ensure the safety of customers when a precharging relay is not closed and a load current flows through a precharging resistor. The invention provides a safety control method of a system having a precharging circuit. The method comprises the following steps: when the undervoltage occurrence number of the precharging circuit reaches m and the duration time from the first undervoltage to the mth undervoltage is less than or equal to tau seconds, an error alarm is given out and the operation of the system is stopped, wherein m and tau are positive integers. Compared with previous methods, according to the invention, advantages of no burning danger, high reliability and reduced cost can be realized, and no additional hardware needs to be added.

Description

technical field [0001] The present invention relates to a safety control method, equipment and a system including the equipment, more specifically, to a safety control method, equipment and a system including the equipment for a frequency converter with a precharging circuit or other control systems. Background technique [0002] In systems with pre-charge circuits with large capacitance (eg, bus capacitors), there can be a problem with the pre-charge resistor becoming overheated when the pre-charge relay fails to close. [0003] For example, figure 1 A frequency converter with a pre-charge circuit is shown. [0004] like figure 1 As shown, when the pre-charge relay S1 cannot be closed, during the charging and discharging cycle of the capacitor C1, due to the voltage division of the resistor R1, the resistor R1 will become overheated, and the capacitor C1 will be undervoltage due to the voltage division of the resistor R1. pressure situation. [0005] In order to meet th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02J13/00H02M1/32H02M1/36H02H3/247
Inventor 王英强刘大为李哲
Owner SCHNEIDER TOSHIBA INVERTER EUROPE SAS
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