CN212909379U

CN212909379U - Solid-state high-frequency power supply applied to electron accelerator

Info

Publication number: CN212909379U
Application number: CN202021844343.3U
Authority: CN
Inventors: 赵憨兵; 张智; 轩宗震; 张新学
Original assignee: Hebei Bohong Induction Technology Co ltd
Current assignee: Hebei Bohong Induction Technology Co ltd
Priority date: 2020-08-29
Filing date: 2020-08-29
Publication date: 2021-04-06
Anticipated expiration: 2030-08-29

Abstract

The utility model relates to a solid-state high-frequency power supply applied to an electron accelerator, belonging to the technical field of electron accelerators, comprising a rectification power regulating unit and an inversion output unit, wherein the voltage input end of the rectification power regulating unit is connected with a power grid, the voltage output end of the rectification power regulating module is connected with the voltage input end of the inversion output unit, the voltage output end of the inversion output unit is used as the power supply output end of the solid-state high-frequency power supply, it is characterized in that the rectification power regulating unit comprises a rectification module and an IGBT chopper, the rectification module comprises a three-phase full-bridge rectifier, the three-phase full-bridge rectifier consists of a silicon controlled rectifier, the input end of the three-phase full-bridge rectifier is connected with three phase lines of a power grid, the output end of the three-phase full-bridge rectifier is connected with the input end of the IGBT chopper through an inductance group L1, and the output end of the IGBT chopper is used as the voltage output end of the rectifying power regulating unit through an inductance group L2. The power-saving control circuit has the characteristics of energy conservation, no influence on a power grid, high power factor and low control voltage.

Description

Solid-state high-frequency power supply applied to electron accelerator

Technical Field

The utility model belongs to the technical field of the electron accelerator, a solid-state high frequency power supply is related to, specifically be applied to the solid-state high frequency power supply of electron accelerator.

Background

The near electron accelerator is used for modifying irradiated materials and carrying out disinfection, sewage treatment and other occasions through high-pressure electron emission bombardment. The excitation source of the electron accelerator is a high-frequency power supply, wherein the high-frequency power supply is traditionally in a mode of electron tube oscillation, 13500V high voltage is generated and sent into the steel barrel, and the steel barrel generates 30MV extra-high voltage through the autotransformer and the oscillator to enable electrons to be emitted.

The existing electronic tubes are high in frequency and large in size and are divided into a voltage regulating cabinet, an electronic tube, a step-up transformer, an electronic tube and the like.

Wherein: 1. the voltage regulating cabinet is in a silicon controlled voltage regulating mode, and the problems of low power factor and large power grid harmonic wave exist through pulse phase-shifting voltage regulation;

2. the electron tube has low high-frequency efficiency and large energy consumption, and the problem of periodical replacement of the service cycle is also caused;

3. the booster transformer is a 50Hz power transformer, and the principle is that 380V voltage is boosted to 13500V, generally, an oil immersion type bare connection is adopted, and the voltage is high in danger;

4. the starting time of the electron tube is slow, the electron tube can be started only after the filament is preheated by two grades, and the electron tube also consumes electric energy when not working;

disclosure of Invention

The utility model discloses a solve above-mentioned problem, designed a solid-state high frequency power supply who is applied to electron accelerator, had energy-conservingly, do not influence the electric wire netting, power factor is high, characteristics that control voltage is low.

The utility model discloses a concrete technical scheme is:

the utility model provides a be applied to electronic accelerator's solid-state high frequency power supply, transfers power unit and contravariant output unit including the rectification, the power unit is transferred in the rectification voltage input end connects the electric wire netting, the voltage output end that the module was transferred in the rectification connects the voltage input end of contravariant output unit, the voltage output end of contravariant output unit is as the power output end of this solid-state high frequency power supply, the rectification transfers power unit to include rectifier module and IGBT chopper, rectifier module includes three-phase full bridge rectifier, three-phase full bridge rectifier comprises the silicon controlled rectifier, three phase lines of electric wire netting are connected to three-phase full bridge rectifier's input, three-phase full bridge rectifier's output is organized L1 through the inductance and is connected the input of IGBT chopper, the output of IGBT chopper is organized L2 through the inductance and.

The inversion output unit comprises an inverter and a resonant circuit, wherein the positive input end and the negative input end of the inversion output unit are respectively used as the voltage input end of the inversion output unit through an inductor 2-L2 and a inductor 2-L1, the output end of the inverter is connected with the input end of a resonant circuit, the resonant circuit comprises a capacitor 2-C1, a capacitor 2-C2, a capacitor 2-C3, a capacitor 2-C4 and a variable inductor L, the capacitor 2-C2 and the capacitor 2-C3 are connected between the positive output end and the negative output end of the inverter in series, the capacitor 2-C4 and the capacitor 2-C1 are respectively connected with the positive output end and the negative output end of the inverter in series, the other ends of the capacitor 2-C4 and the capacitor 2-C1 are connected through the variable inductor L, the variable inductor L is connected with the primary side of a transformer T in parallel, and the L line is used as a voltage output end of the inversion output unit.

Capacitors 2-C11 and 2-C12 are connected between voltage input ends of the inversion output units, and the series point of the capacitors 2-C11 and 2-C12 is grounded.

A circuit breaker QM1 and a main contactor KM2 are connected in series between the voltage input end of the rectifying power regulating unit and a power grid, and the main contactor KM2 is closer to the rectifying power regulating unit than a circuit breaker QM 1.

The inverter is a MOSFET power inverter.

The utility model has the advantages that:

IGBT chopping power regulation can replace silicon controlled rectifier phase shift power regulation, and has high power factor, energy saving and small pollution to a power grid;

drawings

Fig. 1 is a schematic circuit diagram of a middle rectification power regulating unit of the present invention;

fig. 2 is a schematic circuit diagram of the inverter output unit of the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings, but the scope of protection and the implementation of the present invention are not limited thereto.

As shown in fig. 1 and 2 of the specification, a solid-state high-frequency power supply applied to an electron accelerator includes a rectification power regulating unit and an inversion output unit, a voltage input end of the rectification power regulating unit is connected to a power grid, a voltage output end of the rectification power regulating module is connected to a voltage input end of the inversion output unit, and a voltage output end of the inversion output unit is used as a power supply output end of the solid-state high-frequency power supply.

As shown in the attached figure 1 of the specification, the rectification power regulation unit comprises a rectification module and an IGBT chopper, the rectification module comprises a three-phase full-bridge rectifier, the three-phase full-bridge rectifier comprises a silicon controlled rectifier, the input end of the three-phase full-bridge rectifier is connected with three phase lines of a power grid, the output end of the three-phase full-bridge rectifier is connected with the input end of the IGBT chopper through an inductance group L1, and the output end of the IGBT chopper is used as the voltage output end of the rectification power regulation unit through an inductance group L2.

The three-phase voltage of the power grid flows into the three-phase full-bridge rectifier to be rectified into single-phase current, and the advantage that the traditional diode is replaced by the silicon controlled rectifier in the three-phase full-bridge rectifier is that the conduction angle of the trigger pulse is small by using the silicon controlled rectifier for rectification. In the scheme, the IGBT chopping power regulation replaces silicon controlled rectifier voltage regulation, the silicon controlled rectifier voltage regulation principle is phase-shift angle change, the power factor is lower, and the power harmonic is large; the chopping voltage regulation is equivalent to the action of a diode switch when a conduction angle is switched to the minimum position by adopting the silicon controlled full-wave rectification, so that the power factor is high and the harmonic wave of a power grid is small. According to the scheme, the output power is adjusted by adjusting the duty ratio of the IGBT, and the inductance groups L1 and L2 play a role in filtering.

As shown in fig. 2 of the specification, the inverting output unit includes an inverter and a resonant circuit, positive and negative input terminals of the inverting output unit are respectively used as voltage input terminals of the inverting output unit through inductors 2-L2 and 2-L1, an output terminal of the inverter is connected with an input terminal of the resonant circuit, the resonant circuit includes capacitors 2-C1, 2-C2, 2-C3 and 2-C4 and a variable inductor L, the capacitors 2-C2 and 2-C3 are connected in series between positive and negative output terminals of the inverter, the capacitors 2-C4 and 2-C1 are respectively connected in series with positive and negative output terminals of the inverter, the other terminals of the capacitors 2-C4 and 2-C1 are connected through the variable inductor L, the variable inductor L is connected in parallel with a primary side of a transformer T, an N line of a secondary side of the transformer T is grounded, and the L line is used as a voltage output end of the inversion output unit.

According to the scheme, the MOSFET inverter replaces a traditional electronic tube inversion mode, the MOSFET is used as a switching device inverter, the input and output voltage is low, the problem that an electronic tube is replaced periodically is solved, and the inverter works in a ZVS zero-voltage working mode, so that the power consumption is low, and the efficiency is high. MOSFET inverter control controls the inverter switches by a phase lock plate.

The output of the resonance circuit adopts a parallel resonance mode, and aims to generate a high-frequency sine wave signal which is sent into the steel drum after being boosted by a high-frequency transformer. The resonance is characterized in that a clean sine wave signal without harmonic waves can be output after resonance, and the steel drum needs to amplify the signal again, so that the requirement on the harmonic waves is high, and the mode can meet the requirement.

Capacitors 2-C11 and 2-C12 are connected between voltage input ends of the inversion output units, and the series point of the capacitors 2-C11 and 2-C12 is grounded. The capacitors 2-C11 and 2-C12 function to filter the alternating current.

A circuit breaker QM1 and a main contactor KM2 are connected in series between the voltage input end of the rectifying power regulating unit and a power grid, and the main contactor KM2 is closer to the rectifying power regulating unit than a circuit breaker QM 1. The breaker QM1 can protect the power supply, and the main contactor KM2 can function as a switch.

The inverter is a MOSFET power inverter. The MOSFET inverter replaces electron tube inversion, and overcomes the problems of low efficiency, high voltage, periodic replacement and filament preheating.

The inverter converts direct-current voltage into a pulse signal according to requirements and sends the pulse signal to a resonant circuit, the resonant circuit is equivalent to a parallel resonant circuit as a series-parallel circuit, capacitors 2-C3 and 2-C2 are first branches of the resonant circuit, and the capacitors 2-C4, the variable inductor L, the transformer T and the capacitors 2-C1 are second branches. The first branch circuit and the second branch circuit generate resonance, the transformer T is a high-frequency boosting transformer, high-frequency sine wave voltage is converted into an input voltage signal required by the steel drum through the resonance of the transformer T, the input voltage signal is output to the steel drum load, the adjustable inductor L can finely adjust the frequency, and the adjustable inductor L can finely adjust the frequency to adapt to the change of the steel drum load.

Claims

1. A solid-state high-frequency power supply applied to an electron accelerator comprises a rectification power regulating unit and an inversion output unit, the voltage input end of the rectification power regulating unit is connected with a power grid, the voltage output end of the rectification power regulating unit is connected with the voltage input end of the inversion output unit, the voltage output end of the inversion output unit is used as the power output end of the solid-state high-frequency power supply, it is characterized in that the rectification power regulating unit comprises a rectification module and an IGBT chopper, the rectification module comprises a three-phase full-bridge rectifier, the three-phase full-bridge rectifier consists of a silicon controlled rectifier, the input end of the three-phase full-bridge rectifier is connected with three phase lines of a power grid, the output end of the three-phase full-bridge rectifier is connected with the input end of the IGBT chopper through an inductance group L1, and the output end of the IGBT chopper is used as the voltage output end of the rectifying power regulating unit through an inductance group L2.

2. The solid-state high-frequency power supply applied to an electron accelerator according to claim 1, wherein: the inversion output unit comprises an inverter and a resonant circuit, wherein the positive input end and the negative input end of the inversion output unit are respectively used as the voltage input end of the inversion output unit through an inductor 2-L2 and a inductor 2-L1, the output end of the inverter is connected with the input end of a resonant circuit, the resonant circuit comprises a capacitor 2-C1, a capacitor 2-C2, a capacitor 2-C3, a capacitor 2-C4 and a variable inductor L, the capacitor 2-C2 and the capacitor 2-C3 are connected between the positive output end and the negative output end of the inverter in series, the capacitor 2-C4 and the capacitor 2-C1 are respectively connected with the positive output end and the negative output end of the inverter in series, the other ends of the capacitor 2-C4 and the capacitor 2-C1 are connected through the variable inductor L, the variable inductor L is connected with the primary side of a transformer T in parallel, and the L line is used as a voltage output end of the inversion output unit.

3. The solid-state high-frequency power supply applied to an electron accelerator according to claim 2, wherein: capacitors 2-C11 and 2-C12 are connected between voltage input ends of the inversion output units, and the series point of the capacitors 2-C11 and 2-C12 is grounded.

4. The solid-state high-frequency power supply applied to an electron accelerator according to claim 1, wherein: a circuit breaker QM1 and a main contactor KM2 are connected in series between the voltage input end of the rectifying power regulating unit and a power grid, and the main contactor KM2 is closer to the rectifying power regulating unit than a circuit breaker QM 1.

5. The solid-state high-frequency power supply applied to an electron accelerator according to claim 2, wherein: the inverter is a MOSFET power inverter.