Electromagnetic compatibility device for spark light source of photoelectric direct-reading spectrometer

Abstract

The invention discloses an electromagnetic compatibility device for a spark light source of a photoelectric direct-reading spectrometer.The electromagnetic compatibility device comprises a low voltage controlling module, a high voltage generating module, a power module and a voltage isolating module; both the low voltage controlling module and the power module are arranged in a spark light source box; both the high voltage generating module and the voltage isolating module are arranged in a Faraday cage; the Faraday cage is integrated with an exciting platform; a connecting wire for the low voltage controlling module and the high pressure generating module between the Faraday cage and the spark light source box and a connecting wire for the voltage isolating module and the power module are arranged in a shielding mechanism; the exciting platform is connected with the power module through a return cable; the spark light source box and the return cable are grounded; the power module, the low voltage controlling module, the high voltage generating module and the exciting platform are connected with a reference ground in a power supply. According to the electromagnetic compatibility device for a spark light source of a photoelectric direct-reading spectrometer, a current path of a high voltage loop is reduced and electromagnetic interference amplitude is reduced, thereby foundationally solving electromagnetic interference.

Description

technical field [0001] The invention belongs to the technical field of spectroscopic instruments, and in particular relates to an electromagnetic compatibility device used for a spark light source of a photoelectric direct reading spectrometer. Background technique [0002] Existing spark light sources such as figure 1 As shown, it includes a low-voltage control module, a high-voltage generation module, a power module and a voltage isolation module. The signal output terminals of the low-voltage control module are respectively connected to the signal input terminals of the high-voltage generation module and the power module. The high-voltage output of the high-voltage generation module terminal and the voltage output terminal of the power module are respectively connected to the corresponding input terminal of the voltage isolation module, the output terminal of the power isolation module is connected to the excitation platform through the shielding layer, and the above-ment...

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Problems solved by technology

[0002] Existing spark light sources such as figure 1 As shown, it includes a low-voltage control module, a high-voltage generation module, a power module and a voltage isolation module. The signal output terminals of the low-voltage control module are respectively connected to the signal input terminals of the high-voltage generation module and the power module. The high-voltage output of the high-voltage generation module terminal and the voltage output terminal of the power module are respectively connected to the corresponding input terminal of the voltage isolation module, the output terminal of the power isolation module is connected to the excitation platform through the shielding layer, and the above-mentioned low-voltage control module, high-voltage generation module, power module and voltage isolation The modules are all placed in the spark light source box 1 meter away from the excitation platform. The low-voltage control module, high-voltage generation module, and power module are respectively connected to the reference ground inside the power supply and the spark light source box. The spark light source box and the excitation platform are connected to the ground. Such a setting The light source excitation current loop is large, and the electromagnetic radiation is serious

At the same time, the frame of the entire instrument is also grounded, and the shell of the spark power box is also grounded, so the current loop of the spark light source is not single when the spark light source is excited, causing part of the high-frequency current to flow through mechanical components such as the frame, and there are gaps between the mechanical components to form a dual Antennas, generating serious electromagnetic interference

These electromagnetic interferences cause the measurement and control circuit of the instrument to fail to work normally.

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