High-frequency high-voltage power supply for detecting leakage of plastic liquid container

Abstract

A high-frequency high-voltage power supply for liquid leakage detection of plastic liquid containers, including a silicon controlled rectifier intelligent module [2], a filter capacitor [3], an IGBT intelligent power supply module [4], a resonant capacitor [5], and a high-frequency step-up transformer [6], high voltage rotating electrode [7], control circuit [8], resonant inductor [9], current sensor [11], ground electrode [12]. The thyristor intelligent rectifier module [2] is a single-phase full-bridge thyristor rectifier circuit, which converts the single-phase power frequency 220V voltage into a pulsating voltage with adjustable voltage amplitude, which is smoothed by the filter capacitor [3] , get an adjustable DC voltage Ud from 0 to 310V. The IGBT intelligent power module [4] is a single-phase fully-controlled IGBT inverter bridge, which transforms Ud into an alternating symmetrical square wave voltage u1 equal to the switching frequency of the IGBT. The high-frequency step-up transformer [6] transforms the low voltage obtained on its low-voltage side coil into high voltage, and outputs it to the load at both ends of the high-voltage side coil. The two discharge needles of the high-voltage rotating electrode [7] are directly facing the position of the liquid container [13] to be detected on the ground electrode [12].

Description

technical field [0001] The invention relates to a high-frequency and high-voltage power supply, in particular to a high-frequency and high-voltage power supply for liquid leakage detection of a bottle mouth or a bottle body of a liquid container. Background technique [0002] At present, in the production industries such as medicine and beverages, plastic containers are often used to hold certain special liquids. Because the sealing performance of the container directly affects the quality of the liquid product inside the container, and then affects the health and life safety of consumers who use this type of liquid product. Therefore, on the production line of producing this type of plastic liquid, it is very important to carry out on-line detection of the sealing performance of the wall of this type of liquid container. [0003] There are some special methods for liquid container leakage detection. Chinese patent 03157083, Chinese patent 01142523 and Chinese patent 20041...

AI Technical Summary

Problems solved by technology

The problems in the methods of liquid leakage detection of these liquid containers are: one, it is difficult to carry out comprehensive sealing performance detection on the wall of the container with large surface area at the same time; tiny pores and tiny defects

In the production line using this method to detect liquid containers, due to the different structures and sizes of the liquid containers to be detected, the differences in the conductivity of the liquid contained in the containers, and the differences in the structure and discharge gap of the discharge electrodes used, it is possible that The equivalent circuit parameters resulting in liquid containers in different operating states may be different

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