Lighting device for anechoic chamber

Abstract

The invention discloses a lighting device for an anechoic chamber. A direct-current drive power supply arranged outside the anechoic chamber supplies electricity to an LED (Light Emitting Diode) light source, and a direct current filter and an EMC (Electro Magnetic Compatibility) inhibition unit are reasonably arranged on a power supply circuit, so that not only the self electromagnetic interference of the lighting device is avoided effectively, but also the electromagnetic interference in the power supply circuit is blocked effectively; in addition, through the reasonable arrangement of the LED light source in the anechoic chamber, the condition that a plurality of large-size holes are formed in the anechoic chamber is avoided, the microwave absorbing property of the anechoic chamber is improved considerably, the electromagnetic interference problem of the lighting device and a power supplying device is solved effectively, and favorable effects of less interference introduced from the exterior of the anechoic chamber, good microwave absorbing property, low cost, long service life of the lighting device and the like can be achieved.

Description

【Technical field】 [0001] The invention belongs to the field of electromagnetic compatibility (EMC) testing, and in particular relates to a lighting device. 【Background technique】 [0002] The anechoic chamber is an important test site for measuring the radiation interference and radiation immunity of the equipment under test. It is mainly used to reduce the interference of external electromagnetic wave signals on the test signal. Therefore, the electromagnetic interference caused by its lighting devices and power supply devices is relatively high. . At present, most anechoic chambers use HID lamps (such as metal halide lamps, etc.) as lighting fixtures, but due to the need for AC power supply, large electromagnetic interference is introduced; The filter can only filter out a small amount of electromagnetic interference in the power grid, and most of the electromagnetic interference remains in the anechoic chamber; and the transient high-voltage pulse generated by the built-...

AI Technical Summary

Problems solved by technology

Both the power inverter and the motor drive unit of the lifting device will introduce considerable electromagnetic interference. Not only that, the HID lamp and the lifting device are relatively large in size, and it is usually necessary to open multiple large-sized holes on the top of the anechoic chamber as light boxes. HID lamps and lifting devices, opening holes lead to the failure of the laying of absorbing materials in the light box, affecting the performance of the anechoic chamber, such as figure 1 shown

In addition, HID lamps also have problems such as long start-up delay and high heat generation, which put forward more stringent requirements for the ventilation and heat dissipation of the anechoic chamber

[0004] Although there are also a few technical solutions to reduce electromagnetic interference and improve the performance of the anechoic chamber, such as the patent of "a lighting system for an anechoic chamber" with the publication number "CN201636771U", this technical solution only includes the lighting device in addition to the power supply device. , you need to configure multiple devices such as light sources, light emitters, optical fibers, connectors, and light diffusers. The structure is complex and expensive, and ordinary users are often unaffordable

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