CN204669243U - The soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage - Google Patents

Abstract

The utility model discloses a high-frequency and high-voltage soft and stable power supply for an electrostatic precipitator. It consists of a rectifier circuit, a control transformer, an auxiliary power supply, a cooling fan, a full-bridge rectifier drive board, a temperature detection circuit, a drive board, a digital controller, and a voltage and current sampling circuit. The high-frequency and high-voltage soft and stable power supply for electrostatic precipitators of the utility model has good soft and stable characteristics, and can be widely used in dust control in industries such as electric power, metallurgy, chemical industry, and cement.

Description

High-frequency and high-voltage soft and stable power supply for electrostatic precipitator

technical field

The utility model relates to an electrostatic precipitator, in particular to a high-frequency and high-voltage soft and stable power supply for the electrostatic precipitator.

Background technique

Electrostatic precipitator is a common dust removal equipment to remove a large amount of dust emitted in the production process of industrial products. At present, the power supply used by the electrostatic precipitator is mainly a thyristor high-voltage silicon rectifier power supply. The technical principle is to use a power frequency transformer to directly boost the common industrial power (50 Hz, 380 volts) or civilian power (50 Hz, 220 volts) to Tens of thousands of volts are rectified to obtain hard characteristic pulsating DC. Due to its low power factor and efficiency and large fluctuations in output secondary voltage, it takes a long time for sparks to extinguish when flashover occurs, which seriously affects the dust removal effect.

Utility model content

The utility model aims to provide a high-frequency and high-voltage soft and stable power supply for an electrostatic precipitator that can efficiently utilize electric field energy.

The high-frequency and high-voltage soft and stable power supply for the electrostatic precipitator of the utility model includes a circuit breaker, a contactor, a three-phase filter, a three-phase full-control rectification circuit, a filter capacitor, a full-bridge inverter, a high-frequency transformer, a high-voltage rectification circuit, Auxiliary power supply, cooling fan, full-bridge rectifier driver board, temperature detection circuit, driver board, voltage and current sampling circuit, control transformer and digital controller; the circuit breaker, contactor, three-phase filter, three-phase full-control rectifier circuit , a filter capacitor, a full-bridge inverter, a high-frequency transformer, and a high-voltage rectification circuit are connected in series in sequence, and the output end of the high-voltage rectification circuit is connected to the load and the input end of the voltage and current sampling circuit; the output end of the voltage and current sampling circuit is connected to the digital The input end of the controller is connected; the output end of the digital controller is respectively connected with the cooling fan, the contactor, the full-bridge rectification drive board and the drive board; the input end of the temperature detection circuit is respectively connected with the full-bridge inverter and the high-frequency transformer The signal terminal is connected; the output terminal of the temperature detection circuit is connected with the input terminal of the digital controller; the output terminal of the driving board is connected with the input terminal of the full bridge inverter, and the input terminal of the driving board is connected with the digital controller The output end is connected; the control end of the three-phase full-bridge rectifier circuit is connected to the output end of the full-bridge rectification drive board, and the input end of the full-bridge rectification drive board is connected to the output end of the digital controller; the input end of the control transformer It is connected with the output end of the circuit breaker; the output end of the control transformer is connected with the input end of the auxiliary power supply; Output connection for auxiliary power supply.

Optionally, the full-bridge inverter is an IGBT full-bridge inverter.

Optionally, the driving board is an IGBT driving board.

Optionally, the controller is a DSP digital controller.

The utility model's amplitude-modulated high-frequency high-voltage soft-stabilized power supply for electrostatic precipitators has the advantages of small size, light weight, integrated structure manufacturing, stable DC output, strong adaptability to working conditions, power changes with load, and the power supply is always in the best soft work. It can be widely used in dust control in electric power, metallurgy, chemical industry, cement and other industries.

Description of drawings

Fig. 1 is a structural schematic diagram of a high frequency and high voltage soft stable power supply for an electrostatic precipitator of the present invention.

Marked in the figure: 1-circuit breaker; 2-contactor; 3-three-phase filter; 4-three-phase full-control rectification circuit; 5-filter capacitor; 6-IGBT full-bridge inverter; 7-high frequency transformer ;8-high voltage rectification circuit; 9-load; 10-control transformer; 11-auxiliary power supply; 12-full bridge rectification drive board; 13-IGBT drive board; 14-temperature detection circuit; Cooling fan; 17-DSP digital controller.

Detailed ways

Below in conjunction with embodiment and accompanying drawing, the technical solution of the utility model is further elaborated.

Referring to Fig. 1, a circuit breaker 1, a contactor 2, a three-phase filter 3, a three-phase fully-controlled rectification circuit 4, a filter capacitor 5, an IGBT full-bridge inverter 6, a high-frequency transformer 7, and a high-voltage rectification circuit 8 are connected in series in sequence, The output end of the high-voltage rectification circuit 8 is connected to the load 9, and the three-phase 380 V 50 Hz AC voltage is sent to the input end of the three-phase fully-controlled rectification circuit 4 through the circuit breaker 1, the contactor 2, and the three-phase filter 3. The output terminal of the fully-controlled rectification circuit 4 obtains a 530-volt DC voltage, which is filtered by the filter capacitor 5 to obtain a stable 530-volt DC voltage, and then the 530-volt DC voltage is converted into a frequency of 20 kHz to 20 kHz by the IGBT full-bridge inverter 6 The sinusoidal AC voltage with a peak value of 60 kHz is 530 volts, and is then boosted by a high-frequency transformer 7 and rectified by a high-voltage rectifier circuit 8 to obtain a stable DC voltage of 70-100 kV and send it to the load 9 . The output end of the high voltage rectification circuit 8 is connected to the input end of the voltage and current sampling circuit 15, the output end of the voltage and current sampling circuit 15 is connected to the input end of the DSP digital controller 17, and the voltage and current sampling circuit 15 is collected from the output end of the high voltage rectification circuit 8 The current and voltage signals that respond to the working conditions of the load are sent to the DSP digital controller 17 after being limited, second-order filtered, and isolated. Changes are tracked, and the output power is automatically adjusted to keep the output voltage always below the flashover voltage. At the same time, it detects load short circuit, flashover, and open circuit faults and sends out corresponding signals for protection. The output end of the DSP digital controller 17 is connected with the cooling fan 16 and the contactor 2. When the temperature of the IGBT full-bridge inverter 6 and the high-frequency transformer 7 reaches the set value, the DSP digital controller 17 sends a control signal to start the cooling fan. 16 for heat dissipation, when there are fault signals and start and stop signals, the DSP digital controller 17 sends a signal to control the start and stop of the contactor. The 485 communication port of the DSP digital controller 17 is connected with the upper computer (not shown in the figure), and transmits the current working condition and parameters of the power supply to the upper computer for display, and simultaneously accepts and executes various control commands sent by the upper computer. The input end of temperature detection circuit 14 is connected with the signal end of IGBT full-bridge inverter 6, high-frequency transformer 7, the output end of temperature detection circuit 14 is connected with the input end of DSP digital controller 17, and DSP digital controller 17 according to temperature The temperature signal collected by the detection circuit 14 is used to control the temperature rise of the IGBT full-bridge inverter 6 and the high-frequency transformer 7, and when the temperature exceeds the upper limit set value, overheating protection is performed and an overtemperature alarm signal is issued. The output end of the IGBT driver board 13 is connected to the input end of the IGBT full-bridge inverter 6, the input end of the IGBT driver board 13 is connected to the output end of the DSP digital controller 17, and the control pulse sent by the DSP digital controller 17 is driven by the IGBT The output power of the IGBT full-bridge inverter 6 is driven after the amplification and shaping of the board 13 . The input end of the three-phase fully-controlled rectifier circuit 4 is connected to the output end of the DSP digital controller 17, and the output voltage and current signals are carried out by the DSP digital controller 17 for PID calculation, and the output voltage of the three-phase fully-controlled rectifier circuit 4 is controlled according to the calculation result. size. The input end of the control transformer 10 is connected to the output end of the circuit breaker 1, and the temperature detection circuit 14, the IGBT driver board 13, the full-bridge rectification driver board 12, the voltage and current sampling circuit 15, and the DSP digital controller 17 are respectively connected to the auxiliary power supply 11. The output terminal is connected, and the auxiliary power supply 11 obtains power supply from the output terminal of the control transformer 10, and provides control power supply to each circuit after step-down, rectification, filtering and voltage stabilization.

In this embodiment, the circuit breaker, contactor, three-phase filter, three-phase fully-controlled rectifier circuit, filter capacitor, IGBT full-bridge inverter, high-frequency transformer, high-voltage rectifier circuit, load, control transformer, auxiliary power supply, full The bridge rectifier drive board, IGBT drive board, temperature detection circuit, voltage and current sampling circuit, heat dissipation fan and DSP digital controller are all common structures in the prior art, so they will not be described here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (4)

1. the soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage, is characterized in that: comprise circuit breaker, contactor, Three-phase electric-wave filter, three phase controlled rectifier circuit, filter capacitor, full-bridge inverter, high frequency transformer, high-voltage rectifier, accessory power supply, cooling fan, full-bridge rectification drive plate, temperature sensing circuit, drive plate, electric current and voltage sample circuit, control transformer and digitial controller; Described circuit breaker, contactor, Three-phase electric-wave filter, three phase controlled rectifier circuit, filter capacitor, full-bridge inverter, high frequency transformer, high-voltage rectifier are connected successively, and the output of described high-voltage rectifier connects the input of load and electric current and voltage sample circuit; The described output of electric current and voltage sample circuit is connected with the input of digitial controller; Digitial controller output is connected with cooling fan, contactor, full-bridge rectification drive plate and drive plate respectively; The input of described temperature sensing circuit is connected with the signal end of full-bridge inverter, high frequency transformer respectively; The output of described temperature sensing circuit is connected with the input of digitial controller; The output of described drive plate is connected with the input of full-bridge inverter, and the input of drive plate is connected with the output of digitial controller; The control end of described three-phase bridge rectification circuit is connected with the output of full-bridge rectification drive plate, and the input of full-bridge rectification drive plate is connected with the output of digitial controller; The input of described control transformer is connected with the output of circuit breaker; The output of described control transformer is connected with the input of accessory power supply; Described full-bridge rectification drive plate, temperature sensing circuit, drive plate, electric current and voltage sample circuit, digitial controller are connected with the output of described accessory power supply respectively.

2. the soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage according to claim 1, it is characterized in that, described full-bridge inverter is IGBT full-bridge inverter.

3. the soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage according to claim 1, it is characterized in that, described drive plate is IGBT drive plate.

4. the soft voltage-stabilizing power supply of electrostatic precipitator high-frequency and high-voltage according to any one of claim 1-3, is characterized in that, described controller is DSP digitial controller.