A high-efficiency amplitude modulation constant high-frequency electric dust removal power supply circuit

Abstract

The invention discloses a high efficiency amplitude modulation and constant-high-frequency electric de-dusting power supply circuit, belonging to the electric de-dusting power supply technology field.The high efficiency amplitude modulation and constant-high-frequency electric de-dusting power supply circuit can mainly solve problems that in the prior art bus voltage is uncontrollable, an outputDC high voltage power supply does not change along a load, power factors of an input power grid side are low and a harmonic wave is big. The high efficiency amplitude modulation and constant-high-frequency electric de-dusting power supply circuit is characterized in that: a three-phase LCR filtering circuit, a three-phase rectification voltage regulation circuit, an energy storage capacitor, a single-phase full-bridge inverter circuit, an LCC resonance circuit and a high frequency transformer which are connected successively. The three-phase rectification voltage modulation circuit and the single-phase full bridge inverter circuit share the energy storage capacitor. A double-core DSP sampling control circuit is connected to the three-phase rectification voltage modulation circuit, the single-phase full bridge inverter circuit, the LCC resonance circuit and the high frequency transformer. The high efficiency amplitude modulation and constant-high-frequency electric dedusting power supply circuit can dramatically reduce loss of the transformer, can better adapt to power requirements under different loads through a one-time voltage regulation mode, can guarantee stable operation of devices and can be used for an electric de-dusting power supply circuit.

Description

technical field [0001] The invention belongs to the technical field of electric dust removal power supply. Specifically, it relates to a high-efficiency amplitude modulation constant high frequency electric dust removal power supply circuit, which can adjust the output power through amplitude modulation and frequency modulation (adjustment of primary voltage and inverter frequency). Background technique [0002] At present, the amplitude modulation high-frequency high-voltage power supply circuit of the prior art such as figure 1 As shown, it includes a three-phase thyristor voltage regulating filter circuit, an isolated bridge stack circuit, a single-phase bridge inverter circuit, a high-frequency step-up rectifier output circuit and a control circuit. The three-phase alternating current is connected to the isolation bridge stack circuit, the single-phase bridge inverter circuit and the high-frequency step-up rectification output circuit in turn after passing through the t...

AI Technical Summary

Problems solved by technology

Since the AC input of the power grid is changing, the change is ±5% to ±15%, so there are the following disadvantages: 1. The bus voltage added to the series resonant single-phase bridge inverter circuit fluctuates, and if it is too high, it will easily cause the device damage, increasing the difficulty of inverter control; 2. The bus voltage is uncontrollable, even if the load requirement remains unchanged, its output will change accordingly, so the frequency conversion and voltage regulation method cannot solve the problem of random changes in the bus voltage caused by changes in the grid; 3. Electrostatic precipitator The working conditions are random, so the output DC high-voltage power supply should also change accordingly to realize the automatic tracking of the high-voltage power supply for electrostatic precipitator; 4. The power factor of the input grid side is low and the harmonics are large, and additional devices are required to improve the quality of the grid

Both of the above two schemes use a resonant circuit. The characteristics of the capacitor in the resonant circuit will decay with time. If no measures are taken, the output power will decrease.

However, taking corresponding measures will inevitably cause problems such as high cost and large volume.

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