High-protection strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply

Abstract

The invention relates to the technical field of high-voltage pulse power supplies, and particularly discloses a high-protection strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply, and the main loop topology of the three-phase variable-frequency high-voltage pulse dust removal power supply comprises an input rectification part, a series resonance inversion part and a voltage doubling rectification parallel superposition part, the input rectification part comprises a diode module, a buffer unit, an electrolytic capacitor and a voltage-sharing resistor, the series resonance inversion part comprises an IGBT inversion unit and a series resonance unit, and the voltage-multiplying rectification parallel superposition part comprises a resonance transformer secondary side, a voltage-multiplying diode and a voltage-multiplying capacitor. Besides a main topology, the three-phase variable-frequency high-voltage pulse dust removal power supply further comprises a driving board, a main control board and a power supply board, the driving board acts on the multiple detection circuits and the driving circuit to achieve control signal transmission and receive external current and voltage signals, the main control board plays a role in calculation control, and the power supply board plays a role in power supply control. And the power supply board supplies power to other board cards, the fan, the relay controller and the external sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage pulse power supply, and more specifically, to a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply. Background Art

[0002] Common industrial dust removal methods include bag dust removal and water film dust removal, which use the filtering principle to separate dust particles in the exhaust gas; wet dust removal and sedimentation dust removal mainly enhance the affinity between dust and water to wet the dust and increase its weight for dust removal. However, the traditional dust removal efficiency is low, the structure is complex, and the practicality is not strong. In terms of dust removal power supply, the industrial frequency high-voltage dust removal power supply has the disadvantages of low dust removal efficiency and slow voltage response speed. The high-voltage pulse dust removal power supply can solve the above drawbacks by applying high-voltage pulses between the dust collecting electrode and the corona electrode to charge the dust and adsorb it on the dust collecting electrode. However, the high-voltage pulse dust removal power supply has a high failure rate in actual use. The existing high-voltage pulse dust removal power supply cabinet is not enough when facing the working conditions of high dust and high humidity on site. In addition, the high-voltage pulse dust removal power supply cabinet faces long-term outdoor exposure and the loss of its internal power devices, which makes the temperature inside the high-voltage pulse dust removal power supply cabinet very high. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply. Three circuits are set in the three-phase variable-frequency high-voltage pulse dust removal power supply. When the power device of one circuit is damaged and cannot output normally, the other two circuits can continue to output to ensure the operation of the machine, and issue a fault code for prompting, and perform maintenance at an appropriate time. In the rectification and boosting process, the voltage-doubling rectification parallel superposition topology technology is adopted to make the pulse width narrow and the amplitude high, so that the pulse power is high, and the dust with smaller particles is effectively collected, thereby improving the dust removal efficiency. A water-dust separation window design is used at the heat dissipation of the three-phase variable-frequency high-voltage pulse dust removal power supply cabinet to make it have a high protection level. At the same time, a dust concentration sensor is used to detect the gas dust concentration and convert it into an analog signal to realize dynamic adjustment of the switching frequency. Combined with the overall topology, the high-voltage pulse time is short and the loss is reduced to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply, mainly composed of a main circuit topology, a drive board, a main control board and a power supply board, the main circuit topology includes an input rectifier part, a series resonant inverter part and a voltage-doubling rectifier parallel superposition part, the input rectifier part includes a diode module, a buffer unit, an electrolytic capacitor and a voltage-equalizing resistor, the series resonant inverter part includes an IGBT inverter unit and a series resonant unit, the voltage-doubling rectifier parallel superposition part includes a secondary side of a resonant transformer, a voltage-doubling diode and a voltage-doubling capacitor, when using the three-phase variable-frequency high-voltage pulse dust removal power supply, a dust concentration sensor needs to be installed externally, and the dust concentration sensor is connected to the power supply and analog input port on the main control board.

[0005] As a further solution of the present invention, the input rectifier part includes a diode module, and the diode module is composed of D1, D2, D3, D4, D5 and D6. D1, D2, D3, D4, D5 and D6 constitute a three-phase half-bridge rectifier circuit. The diode module rectifies the three-phase power frequency sine wave into a DC voltage, and uses the unidirectional conductivity of the diode to allow the current to flow in a specific direction, thereby converting the AC input into a DC output. The diode module is connected to a buffer unit, and the buffer unit is connected to an electrolytic capacitor C d 1 and electrolytic capacitor C d 2 are connected in series, the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2. The DC voltage is subjected to energy storage filtering, and each electrolytic capacitor is connected in parallel with a voltage-equalizing resistor R d 1 and voltage balancing resistor R d 2. The voltage balancing resistor R d 1 and the voltage balancing resistor R d 2 ensures that the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2 Balanced distribution of voltage at both ends.

[0006] As a further solution of the present invention, the series resonant inverter part includes an IGBT inverter unit, the IGBT inverter unit is composed of Q1, Q2, Q3, Q4, Q5 and Q6, Q1, Q2, Q3, Q4, Q5 and Q6 constitute a three-phase half-bridge inverter, the IGBT inverter unit converts a DC voltage into a high-frequency AC voltage, the IGBT inverter unit is connected to the series resonant unit, the series resonant unit includes a resonant capacitor, a resonant inductor and a resonant transformer, the resonant capacitor includes C r 1. C r 2. C r 3. The resonant capacitor is connected to the resonant inductor, and the resonant inductor includes L r 1. L r 2. Lr 3. The resonant inductor is used to store and release magnetic field energy, and cooperates with the resonant capacitor in the circuit to perform periodic conversion of electric energy and magnetic energy. The resonant inductor is connected to a resonant transformer, and the resonant transformer includes an excitation inductor L m 1. Excitation inductance L m 2 and the excitation inductance L m 3. The resonant transformer plays a role in voltage change and isolation in the circuit. At the neutral point of each half-bridge, the resonant inductor, the resonant capacitor, the resonant transformer and the negative bus are connected in series to form a resonant network.

[0007] As a further solution of the present invention, the voltage doubler rectifier parallel superposition part includes a secondary side of a resonant transformer, and the secondary side of the resonant transformer includes T1, T2 and T3, and its function is to output the high-frequency AC voltage after being stepped down by the resonant transformer to meet the input requirements of the voltage doubler rectifier circuit. The secondary side of the resonant transformer is connected to a voltage doubler diode, and the voltage doubler diode includes D7-D21. The voltage doubler diode plays a role of rectification and voltage multiplication. The main circuit topology also includes a voltage doubler capacitor, and the voltage doubler capacitor includes C1-C15, which is mainly used for energy storage and voltage superposition.

[0008] As a further solution of the present invention, the driver board acts on the input phase loss detection circuit, the bus detection circuit, the inverter unit temperature monitoring circuit, the output current detection circuit, the output parallel branch current detection circuit, and the IGBT drive circuit, controls signal transmission and receives external current and voltage signals, transmits the input phase loss signal, the bus detection signal, the temperature signal, and the output current signal to the main control board, receives and processes the drive signal of the main control board and transmits the relay controller pull-in control signal, the right end of the driver board is connected to the main control board through a cable, the main control board plays a role in calculation and control, the main control board receives and processes various signals, and the various signals include: external dust concentration sensor analog input signal, user setting data, bus detection voltage signal, output current and branch current detection signal, temperature detection signal, phase loss detection signal, the issued drive signal and the control signal of the relay and the fan, the left end of the driver board is connected to the power board through a cable, the power board provides power for other boards, fans, relay controllers and external sensors, and the power board converts the bus voltage into multiple power outputs.

[0009] As a further solution of the present invention, the three-phase industrial frequency sine wave is rectified by the diode module and filtered by the electrolytic capacitor energy storage, and then passes through the series resonant circuit to achieve zero voltage switching of the IGBT and reduce the conduction loss of the IGBT; the series resonant circuit has a resonance point f r 1 and f r 2, among which, The operating frequency is set at f r 1, when the input voltage drops, the gain is obtained by reducing the operating frequency. Since the input voltage waveform may be large in the application field, the series resonant inverter circuit of the present invention can work in the zero voltage working area regardless of load changes or input voltage changes. Furthermore, three groups of transformers of the same specifications are connected in parallel after independent voltage doubling output. Due to the existence of the transformer, the switch ripple is shielded to a limited extent, and its output form is a square wave. The existence of the parallel form increases the frequency of the pulse and enhances the dust collection capacity.

[0010] As a further scheme of the present invention, a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet includes the following specific contents: the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet is connected with the front and rear beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet, the columns of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet and the side beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet through a bending shape and an avoidance and interlacing technology coordinated with the bending shape, so that it can withstand a certain external impact force and vibration, and an isolation design is adopted at the heat dissipation of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet to isolate the air duct of the sheet metal cabinet separately to form a water-dust separation window, and the isolation design prevents water and dust from entering the cavity where the electrical components of the internal equipment of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet are located, and the water-dust separation window has passed the mechanism shell protection level test and reached level IP54.

[0011] As a further solution of the present invention, a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply control method includes the following specific contents:

[0012] Step S1, before the three-phase variable frequency high-voltage pulse dust removal power supply is started and put into operation, it is necessary to judge the input phase loss, the bus voltage is within a reasonable range, and the overcurrent situation in sequence, and output the corresponding fault code if a fault occurs;

[0013] Step S2, the three-phase variable frequency high-voltage pulse dust removal power supply has two modes: constant frequency mode and adaptive mode, which can be set by the user as needed;

[0014] Step S3, if the adaptive mode is running, the dust concentration sensor feeds back a 0-10V voltage signal according to the dust concentration, and adjusts the operating frequency according to the voltage signal analog value. The adaptive mode reduces power device loss, saves energy and reduces cabinet temperature rise when the concentration is low;

[0015] Step S4, if one of the power devices fails, the fault is determined based on the output of the three current sensors and the current operating status and the corresponding fault code is output. In this case, the machine will not be shut down and the other two will continue to operate. If it is determined that the output of the two current transformers is abnormal, because the output of one of the three current transformers causes great damage to the device, the machine will stop running and output a fault code.

[0016] The technical effects and advantages of a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply of the present invention are as follows: the technical solution realizes a strong redundancy function by setting three circuits. When the power device of one circuit is damaged, the other two circuits can continue to output to ensure operation and issue a fault prompt. The voltage-doubling rectifier parallel superposition topology technology is adopted to make the pulse width narrow, the amplitude high, and the power large, which can effectively collect dust with smaller particles and improve the dust removal efficiency. In terms of control, the power supply has two modes: constant frequency and adaptive. In the adaptive mode, the operating frequency can be adjusted according to the voltage signal fed back by the dust concentration sensor, which can reduce the power device loss, save energy and reduce the cabinet temperature rise when the concentration is low. At the same time, it can perform multiple fault judgments and output corresponding codes before starting the machine. In terms of structural design, the power cabinet adopts a bending shape and avoidance interlacing technology to connect the beams, columns and side beams, so that it can withstand external impact and vibration. The isolated design at the heat dissipation point forms a water-dust separation window with a protection level of IP54, which effectively prevents water and dust from entering the internal electrical component cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic diagram of the main circuit topology of a three-phase variable frequency high-voltage pulse dust removal power supply with high protection and strong redundancy.

[0018] Figure 2 This is a schematic diagram of the overall control structure of a high-protection and highly redundant three-phase variable-frequency high-voltage pulse dust removal power supply of the present invention.

[0019] Figure 3 This is a structural schematic diagram of a high-protection and highly redundant three-phase variable-frequency high-voltage pulse dust removal power supply cabinet.

[0020] Figure 4 The figure is a flow chart of a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply control method. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] See also Figure 1 As shown in the structural schematic diagram, the embodiment of the present invention provides a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power main circuit topology, the main circuit topology includes an input rectifier part, the input rectifier part includes a diode module, the diode module is composed of D1, D2, D3, D4, D5 and D6, the D1, the D2, the D3, the D4, the D5 and the D6 constitute a three-phase half-bridge rectifier circuit, the diode module rectifies the three-phase power frequency sine wave into a DC voltage, and uses the unidirectional conductivity of the diode to allow the current to flow in a specific direction, converting the AC input into a DC output, the diode module is connected to the buffer unit, and the buffer unit is connected to the electrolytic capacitor C d 1 and electrolytic capacitor C d 2 are connected in series, the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2. The DC voltage is filtered to make the voltage smoother and more stable. Each electrolytic capacitor is connected in parallel with a voltage-equalizing resistor R d 1 and voltage balancing resistor R d 2. The voltage balancing resistor R d 1 and the voltage balancing resistor R d 2 ensures that the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2 balanced distribution of voltage at both ends to prevent damage to the electrolytic capacitor due to uneven voltage; the main circuit topology includes a series resonant inverter part, the series resonant inverter part includes an IGBT inverter unit, the IGBT inverter unit is composed of Q1, Q2, Q3, Q4, Q5 and Q6, Q1, Q2, Q3, Q4, Q5 and Q6 constitute a three-phase half-bridge inverter, the IGBT inverter unit converts a DC voltage into a high-frequency AC voltage, the IGBT inverter unit is connected to a series resonant unit, the series resonant unit includes a resonant capacitor, a resonant inductor and a resonant transformer, the resonant capacitor includes C r 1. C r 2. C r 3. The resonant capacitor is connected to the resonant inductor, and the resonant inductor includes L r 1. L r 2. L r 3. The resonant inductor is used to store and release magnetic field energy, and cooperates with the resonant capacitor in the circuit to perform periodic conversion of electric energy and magnetic energy. The resonant inductor is connected to a resonant transformer, and the resonant transformer includes an excitation inductor L m 1. Excitation inductance L m 2 and the excitation inductance L m3. The resonant transformer plays a role of voltage change and isolation in the circuit. At the neutral point of each half-bridge, the resonant inductor, the resonant capacitor, the resonant transformer and the negative bus are connected in series to form a resonant network; the main circuit topology also includes a voltage doubling rectifier parallel superposition part, the voltage doubling rectifier parallel superposition part includes a resonant transformer secondary side, the resonant transformer secondary side includes T1, T2 and T3, and its function is to output the high-frequency AC voltage after the resonant transformer is stepped down to meet the input requirements of the voltage doubling rectifier circuit, the resonant transformer secondary side is connected to the voltage doubling diode, the voltage doubling diode includes D7-D21, the voltage doubling diode plays the role of rectification and voltage doubling, the main circuit topology also includes a voltage doubling capacitor, the voltage doubling capacitor includes C1-C15, which is mainly used for energy storage and voltage superposition.

[0024] The three-phase industrial frequency sine wave is rectified by the diode module and filtered by the electrolytic capacitor energy storage, and then passes through the series resonant circuit, so that the IGBT is switched at zero voltage, and the conduction loss of the IGBT is reduced; the series resonant circuit has a resonance point f r 1 and f r 2, among which, The operating frequency is set at f r 1. When the input voltage drops, a larger gain can be obtained by reducing the operating frequency. Since the input voltage waveform may be large in the application field, the series resonant inverter circuit of the present invention can operate in the zero voltage working area regardless of load changes or input voltage changes. Furthermore, three groups of transformers of the same specifications are connected in parallel after independent voltage doubling output. Due to the existence of the transformer, the switching ripple is shielded to a limited extent, and the output form is a square wave. The existence of the parallel form increases the frequency of the pulse and enhances the dust collection capacity.

[0025] Example 2

[0026] See also Figure 2As shown in the structural schematic diagram, the embodiment of the present invention provides a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply whole machine control, the whole machine control includes a drive board, the drive board acts on the input phase loss detection circuit, the bus detection circuit, the inverter unit temperature monitoring circuit, the output current detection circuit, the output parallel branch current detection circuit, and the IGBT drive circuit, controls signal transmission and receives external current and voltage signals, transmits the input phase loss signal, the bus detection signal, the temperature signal, and the output current signal to the main control board, receives and processes the drive signal of the main control board and transmits the relay controller pull-in control signal, the right end of the drive board is connected to the main control board through a cable, the main control board plays a role in calculation control, and is based on the 32-bit floating-point DSP processor TMS320F28335, receives and processes various signals, and the various signals Including: external dust concentration sensor analog input signal, user setting data, bus detection voltage signal, output current and branch current detection signal, temperature detection signal, phase loss detection signal, issued drive signal and relay, fan control signal, etc.; the left end of the drive board is connected to the power board through a cable, and the power board provides power for other boards, fans, relay controllers and external sensors. The power board converts the bus voltage into multiple power outputs, among which 24V power supply is used for relay controller control, fan and external sensor power supply, and ±15V and 5V are used for the drive board and the main control board and multiple drive power supply; when using the three-phase variable frequency high-voltage pulse dust removal power supply, a dust concentration sensor needs to be installed externally, and the dust concentration sensor is connected to the power supply and analog input port on the main control board.

[0027] Example 3

[0028] See also Figure 3 As shown in the structural schematic diagram, an embodiment of the present invention provides a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet. The three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet is connected with the front and rear beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet, the columns of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet and the side beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet through a bending shape and an avoidance and interlacing technology coordinated with the bending shape, so that it can withstand a certain external impact force and vibration. An isolation design is adopted at the heat dissipation of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet to isolate the air duct of the sheet metal cabinet separately to form a water-dust separation window. The isolation design prevents water and dust from entering the cavity where the electrical components of the internal equipment of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet are located. The water-dust separation window has passed the mechanism shell protection level test and can reach IP54.

[0029] Example 4

[0030] See also Figure 4The flow chart shown in the figure shows that the embodiment of the present invention provides a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply control method. The three-phase variable-frequency high-voltage pulse dust removal power supply needs to be judged whether the input is missing phase, whether the bus voltage is within a reasonable range, and whether there is an overcurrent before starting up and entering operation. If a fault occurs, the corresponding fault code is output. There are two modes for the three-phase variable-frequency high-voltage pulse dust removal power supply, which can be customized by the user according to the needs, one is the constant frequency mode, and the other is the self-use mode. If the adaptive mode is run, the dust concentration sensor feeds back a 0-10V voltage signal according to the dust concentration, and adjusts the operating frequency according to the analog value of the voltage signal. The voltage signal is positively correlated with the gas dust concentration, and the frequency is positively correlated with the voltage signal. This mode of operation can reduce the loss of power devices when the concentration is low, which can save energy and relatively reduce the temperature rise of the cabinet; if a power device fails in one path, the fault can be effectively determined according to the output of the three-way current sensor and the current operating state, and the corresponding fault code is output. When the machine is running without stopping at this time, the other two paths can continue to run. If the output of the two current transformers is determined to be abnormal, the operation will be stopped and the corresponding fault code will be output, because the output of one branch will cause greater damage to the device. In order to ensure the realization of this design, the present invention considers the poor operation status of the two branches in the selection of power devices. This method provides a certain guarantee for economic losses caused by faults and reduces after-sales pressure.

[0031] The present invention sets three circuits to achieve strong redundancy. When one power device is damaged, the other two can ensure operation and issue a fault prompt. At the same time, the voltage doubler rectifier parallel superposition topology technology is used to make the pulse have the characteristics of narrow pulse width, high amplitude and high power, which greatly improves the collection efficiency of small particle dust. The power supply unit is provided with two modes: constant frequency and adaptive. The adaptive mode can adjust the operating frequency according to the feedback voltage signal of the dust concentration sensor, reduce the power device loss, save energy and reduce the cabinet temperature rise when the concentration is low, and can perform multiple fault judgments and output corresponding codes before starting. The power cabinet uses a bending shape and avoidance interlacing technology to connect the beams, columns and side beams, which can withstand external impact and vibration. The isolated design of the heat dissipation part forms a water-dust separation window. The protection level reaches IP54, which can effectively prevent water and dust from entering the internal electrical component cavity.

[0032] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0033] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply, mainly composed of a main circuit topology, a drive board, a main control board and a power board, characterized in that: The main circuit topology includes an input rectification part, a series resonant inverter part and a voltage doubler rectifier parallel superposition part. The input rectification part includes a diode module, a buffer unit, an electrolytic capacitor and a voltage equalizing resistor. The series resonant inverter part includes an IGBT inverter unit and a series resonant unit. The voltage doubler rectifier parallel superposition part includes a secondary side of a resonant transformer, a voltage doubler diode and a voltage doubler capacitor. When using the three-phase variable frequency high-voltage pulse dust removal power supply, a dust concentration sensor needs to be installed externally. The dust concentration sensor is connected to the power supply and analog input port on the main control board.

2. According to claim 1, a high-protection, strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply is characterized in that The input rectifier part includes a diode module, which is composed of D1, D2, D3, D4, D5 and D6. D1, D2, D3, D4, D5 and D6 form a three-phase half-bridge rectifier circuit. The diode module rectifies the three-phase industrial frequency sine wave into a DC voltage, and uses the unidirectional conductivity of the diode to allow current to flow in a specific direction to convert the AC input into a DC output. The diode module is connected to a buffer unit, and the buffer unit is connected to an electrolytic capacitor C d 1 and electrolytic capacitor C d 2 are connected in series, the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2. The DC voltage is subjected to energy storage filtering, and each electrolytic capacitor is connected in parallel with a voltage-equalizing resistor R d 1 and voltage balancing resistor R d 2. The voltage balancing resistor R d 1 and the voltage balancing resistor R d 2 Ensure that the electrolytic capacitor C d 1 and the electrolytic capacitor C d 2 Balanced distribution of voltage at both ends.

3. According to claim 1, a high-protection, strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply is characterized in that The series resonant inverter part includes an IGBT inverter unit, which is composed of Q1, Q2, Q3, Q4, Q5 and Q6. Q1, Q2, Q3, Q4, Q5 and Q6 form a three-phase half-bridge inverter. The IGBT inverter unit converts the DC voltage into a high-frequency AC voltage. The IGBT inverter unit is connected to the series resonant unit. The series resonant unit includes a resonant capacitor, a resonant inductor and a resonant transformer. The resonant capacitor includes C r 1. C r 2. C r 3. The resonant capacitor is connected to the resonant inductor, and the resonant inductor includes L r 1. L r 2. L r 3. The resonant inductor is used to store and release magnetic field energy, and cooperates with the resonant capacitor in the circuit to perform periodic conversion of electric energy and magnetic energy. The resonant inductor is connected to a resonant transformer, and the resonant transformer includes an excitation inductor L m 1. Excitation inductance L m 2 and the excitation inductance L m 3. The resonant transformer plays a role in voltage change and isolation in the circuit. At the neutral point of each half-bridge, the resonant inductor, the resonant capacitor, the resonant transformer and the negative bus are connected in series to form a resonant network.

4. According to claim 1, a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply is characterized in that: The voltage doubler rectifier parallel superposition part includes a secondary side of a resonant transformer, and the secondary side of the resonant transformer includes T1, T2 and T3, and its function is to output the high-frequency AC voltage after being stepped down by the resonant transformer. The secondary side of the resonant transformer is connected to a voltage doubler diode, and the voltage doubler diode includes D7-D21. The voltage doubler diode plays the role of rectification and voltage multiplication. The main circuit topology also includes a voltage doubler capacitor, and the voltage doubler capacitor includes C1-C15, which is used for energy storage and voltage superposition.

5. According to the high protection and strong redundancy three-phase variable frequency high voltage pulse dust removal power supply of claim 1, it is characterized in that: The drive board has an input phase loss detection circuit, a bus detection circuit, an inverter unit temperature monitoring circuit, an output current detection circuit, an output parallel branch current detection circuit, and an IGBT drive circuit, which are used to control signal transmission and receive external current and voltage signals, transmit input phase loss signals, bus detection signals, temperature signals, and output current signals to the main control board, receive and process the drive signals of the main control board, transmit relay control signals, and transmit fan control signals. The right end of the drive board is connected to the main control board through a cable, and the main control board receives and processes various signals, including: external dust concentration sensor analog input signals, user setting data, bus detection voltage signals, output current and branch current detection signals, temperature detection signals, phase loss detection signals, and sends drive signals and relay and fan control signals. The left end of the drive board is connected to the power board through a cable, and the power board provides power for other boards, fans, relay controllers, and external sensors. The power board converts the bus voltage into multiple power outputs.

6. According to claim 2, a high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply is characterized in that: The three-phase industrial frequency sine wave is rectified by the diode module and filtered by the electrolytic capacitor energy storage, and then passes through the series resonant circuit to achieve zero voltage switching of the IGBT, thereby reducing the conduction loss of the IGBT. The series resonant circuit has a resonance point f r 1 and f r 2, among which, The operating frequency is set at f r 1, when the input voltage decreases, gain is obtained by reducing the operating frequency.

7. A high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power cabinet, characterized in that: A high-protection and highly redundant three-phase variable-frequency high-voltage pulse dust-removal power supply as described in any one of claims 1-6, wherein the front and rear beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet, the columns of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet and the side beams of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet are connected by a bending shape and an avoidance technique coordinated with the bending shape, so that it can withstand external impact and vibration, and an isolation design is adopted at the heat dissipation of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet to isolate the air duct of the sheet metal cabinet and form a water-dust separation window, and the isolation design prevents water and dust from entering the cavity where the electrical components of the internal equipment of the three-phase variable-frequency high-voltage pulse dust-removal power supply cabinet are located, and the water-dust separation window has passed the mechanism shell protection level test and reached level IP54.

8. A high-protection and strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply control method, characterized in that: A high-protection, strong-redundancy three-phase variable-frequency high-voltage pulse dust removal power supply as described in any one of claims 1 to 6 comprises the following steps: Step S1, before the three-phase variable frequency high-voltage pulse dust removal power supply is started and put into operation, it is necessary to judge the input phase loss, the bus voltage is within a reasonable range, and the overcurrent situation in sequence, and output the corresponding fault code if a fault occurs; Step S2, the three-phase variable frequency high-voltage pulse dust removal power supply has two modes: constant frequency mode and adaptive mode, which can be set by the user as needed; Step S3, if the adaptive mode is running, the dust concentration sensor feeds back a 0-10V voltage signal according to the dust concentration, and adjusts the operating frequency according to the voltage signal analog value. The adaptive mode reduces power device loss, saves energy and reduces cabinet temperature rise when the concentration is low; Step S4, if one of the power devices fails, the fault is determined based on the output of the three current sensors and the current operating status and the corresponding fault code is output. In this case, the machine will not be shut down and the other two will continue to operate. If it is determined that the output of the two current transformers is abnormal, because the output of one of the three current transformers causes great damage to the device, the machine will stop running and output a fault code.

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