Soft start and closed-loop control method of pulse generating circuit

Abstract

The invention discloses a soft start and closed-loop control method of a pulse generating circuit, wherein the pulse generating circuit is a pulse generating unit controlled by a signal control unit in an electrostatic dust collection power supply and is composed of a three-phase bridge full-controlled rectifier module, a DC-DC boosted circuit and a pulse boosting module; the output of the signal control unit is divided into three paths, which are separately connected with the three-phase bridge full-controlled rectifier module, the DC-DC boosted circuit and the pulse boosting module; while starting the three-phase bridge full-controlled rectifier module and the DC-DC boosted circuit, the signal control unit provides a soft start signal and a PI adjusting signal and using a relative small value as the control signal after comparing so as to realize the soft start of the corresponding module; while the module output voltage is gradually risen to certain value, the PI output value is reduced. Only by setting the final value of the soft start signal to be more than a prospective PI output value, the PI output provides control for the corresponding module so as to realize the closed-loop control.

Description

technical field [0001] The invention relates to a power supply control technology, in particular to a high-voltage pulse control method for an electrostatic precipitator power supply. Background technique [0002] Electrostatic dust removal is a commonly used dust removal method in modern industrial systems, and it is also an important means of controlling air pollution. At present, the electrostatic precipitator method adopted by most enterprises is to use high-voltage direct current as the power supply of the precipitator. In this power supply mode, the equivalent capacitance effect of the dust layer will cause the back corona phenomenon, resulting in a decrease in dust removal efficiency, and for dust particles with a particle size of less than 0.1 μm, the dust removal efficiency is very low. With the continuous improvement of national environmental protection requirements, the requirements for exhaust emissions of enterprises have also increased. The traditional electro...

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Problems solved by technology

This method realizes the superposition of high-voltage direct current and high-voltage pulse, and has the advantages of overcoming the back corona phenomenon, improving the dust collection efficiency, and reducing the dust collection area of ​​the dust collector, but it also has the following disadvantages: (1) The power supply involved in this method The structure is too abstract, there is no specific power supply structure, and the implementation is difficult. For example, the adjustable range of high-voltage pulse amplitude is 1kV to 1000kV, and the adjustable range of pulse frequency is 1Hz to 1000kHz. The high-voltage DC voltage only needs tens of kilovolts, and the frequency of high-voltage pulses is only a few hundred Hz, which is not practical.

(2) The parameter setting is too ideal. For example, 1kV and 1000kV belong to completely different voltage levels, and the corresponding insulation levels are also different. It is difficult to make a high-voltage DC source adjustable from 1kV to 1000kV, and it is impossible to control the high-voltage DC of the existing dust collector. Power Supply for Low-Cost Retrofit

Therefore, based on the above shortcomings, the specific application of this method is limited.

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