Full-control rectification and full-control inversion melt-blown cloth electret power supply based on PWM technology

Abstract

The invention relates to the technical field of melt-blown cloth electret power supplies, in particular to a PWM technology-based fully-controlled rectification and fully-controlled inversion melt-blown cloth electret power supply which comprises a power grid alternating-current voltage va, an alternating-current input inductor L, a fully-controlled rectifier bridge, a filter capacitor C, a fully-controlled inverter bridge and a high-voltage pack, wherein the power grid alternating voltage va is connected with the input end of the full-controlled rectifier bridge, the output end of the full-controlled rectifier bridge is connected with the input end of the full-controlled inverter bridge, the output end of the full-controlled inverter bridge is connected with the high-voltage pack, and the filter capacitor C is connected in parallel between the full-controlled rectifier bridge and the full-controlled inverter bridge. The design of the full-controlled rectifier bridge and the application of double closed-loop control are adopted, so that the amplitude of the pre-stage rectification output voltage is higher, the boosting transformation ratio of the boosting transformer is reduced, the reliability of the circuit is improved, reactive components are reduced through current loop control based on a PR regulator, and the harmonic pollution of a melt-blown power supply to a power grid is inhibited.

Description

technical field [0001] The invention relates to the technical field of melt-blown cloth electret power supply, in particular to a melt-blown cloth electret power supply with full-control rectification and full-control inverter based on PWM technology. Background technique [0002] High-pressure electret treatment technology is the core technology to improve the virus adsorption effect of melt-blown cloth and meet the N95 standard. The shortage of high-pressure equipment and the uneven performance are the key factors restricting the quality and output of masks. However, the traditional electret power supply for melt-blown cloth often adopts an uncontrolled rectifier bridge + LLC resonant circuit topology, which mainly includes an uncontrolled rectifier bridge, an LLC resonant inverter circuit, and a high-voltage package. Among them, the uncontrolled rectifier bridge converts the single-phase alternating current output by the AC power supply into direct current. Due to the un...

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Problems solved by technology

due to L r 、C r Due to the characteristics of the resonant circuit, its current stress is large, causing a huge burden on the devices in the inverter bridge circuit, and it is easy to damage the power electronic devices in the inverter bridge circuit, and the LLC in the traditional LLC resonant inverter circuit r 、C r Parameter calculation is cumbersome, which greatly increases the difficulty of circuit design

In order to solve the shortage of high-voltage equipment, the output voltage stability and amplitude of the melt blown cloth electret power supply are low

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