Voltage short interruption noise immunity promoting circuit of transducer and transducer

Abstract

The invention discloses a voltage short interruption noise immunity promoting circuit of a transducer and the transducer. The voltage short interruption noise immunity promoting circuit comprises the alternating-current power supply input end, a charging circuit, a rectifying circuit, a PFC circuit, an electrolytic capacitor, an inverter circuit, a supply voltage interruption time detection circuit and a controller. The supply voltage interruption time detection circuit detects short interruption time of alternating-current supply voltage input by the alternating-current power supply input end, and outputs the detection result to the controller. The controller outputs corresponding control signals according to the received detection result and controls the charging circuit to charge the electrolytic capacitor. The promoting circuit can effectively restrain impact currents generated when the supply voltage returns to normal again from voltage short interruption and charges the electrolytic capacitor in the circuit, the level of short interruption noise immunity of the transducer is increased, the reliability of the transducer is improved, and the promoting circuit further has the advantage of being low in cost.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to a short-term voltage interruption immunity boosting circuit of a frequency converter and a frequency converter. Background technique [0002] Short-term voltage interruption phenomenon is a common power quality problem. According to the definition of GB / T17626.11, short-time voltage interruption refers to the disappearance of power supply voltage for a period of time, generally not exceeding 1 minute. The short-term voltage interruption can be considered as 100 % amplitude voltage sag, if the short-time interruption of voltage is not handled properly, it will directly affect the normal operation of the electrical equipment, and even damage the electrical equipment, thus requiring the electrical equipment to have a higher voltage short-interruption resistance Interference ability. [0003] When the inverter is running at full load, the short-term interruption of its ...

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Problems solved by technology

[0002] Short-term voltage interruption phenomenon is a common power quality problem. According to the definition of GB / T17626.11, short-time voltage interruption refers to the disappearance of power supply voltage for a period of time, generally not exceeding 1 minute. The short-term voltage interruption can be considered as 100 % amplitude of the voltage sag, if the short-term interruption of voltage is not handled properly, it will directly affect the normal operation of the electrical equipment, and even damage the electrical equipment, thus requiring the electrical equipment to have a higher voltage short-interruption resistance Interference ability

[0003] When the inverter is running at full load, the short-term interruption of its power supply voltage will cause the electric energy stored in the electrolytic capacitor in the inverter to be quickly consumed. When the power supply voltage returns to normal power supply, the electrolytic capacitor needs to be charged However, in the above-mentioned recharging and energy storage process of the electrolytic capacitor, it is very easy to generate a large inrush current, which will damage the rectifier circuit of the main circuit of the inverter, the devices in the PFC circuit, and the electrolytic capacitor. Cause adverse effects, even damage the rectifier circuit, PFC circuit and electrolytic capacitor

At present, the voltage interruption immunity level of the inverter is usually increased by increasing the forward peak surge current or the rated short-time withstand current of the device, but this method requires a large cost

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