Fault protection device, frequency converter and motor driving system

A fault protection and frequency converter technology, which is applied in emergency protection circuit devices, control systems, motor control, etc., can solve problems such as inapplicability of protection mechanisms, and achieve the effects of improving market competitiveness, high reliability, and expanding the scope of application
CN110350486AActive Publication Date: 2019-10-18GD MIDEA HEATING & VENTILATING EQUIP CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
GD MIDEA HEATING & VENTILATING EQUIP CO LTD
Publication Date
2019-10-18

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Abstract

The invention provides a fault protection device, a frequency converter and a motor driving system. The fault protection device comprises a sampling circuit, a comparison circuit and a control module,wherein the sampling circuit is used for sampling a bus voltage of the frequency converter; the input end of the comparison circuit is connected with the output end of the sampling circuit, and the comparison circuit generates a corresponding fault signal according to the abnormal bus voltage; the control module is connected with the comparison circuit, and the control module is used for controlling the frequency converter to stop outputting a PWM driving signal according to the fault signal. An abnormal bus voltage is detected through a hardware comparison circuit; and the control module istriggered to control the frequency converter to stop outputting the PWM driving signal, so that the problem that effective protection cannot be achieved due to time delay when the bus voltage is detected through software can be solved, the response speed is greatly increased, and the safety and reliability of the frequency converter in various extreme occasions are ensured.
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Description

technical field

[0001] The invention relates to the technical field of motor control, in particular to a fault protection device, a frequency converter and a motor drive system. Background technique

[0002] For AC-DC-AC inverters with three-phase input and three-phase output without electrolytic capacitors, through reasonable hardware design combined with motor software control algorithms, the DC-Link capacitors of the inverters can be replaced by large-capacity electrolytic capacitors with small-capacity ones. Film capacitors, the required capacitance value can be reduced to less than 5% of the traditional inverter with electrolytic capacitors, thus greatly reducing the volume of the entire inverter and reducing hardware costs, because the reliability of film capacitors is far greater than that of electrolytic capacitors. capacitance, which also improves the reliability of the motor drive system.

[0003] For AC-DC-AC inverters with three-phase input and three-phase outpu...

Claims

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