WO2023060411A1

WO2023060411A1 - Floodlight system for anechoic room or shielded room

Info

Publication number: WO2023060411A1
Application number: PCT/CN2021/123149
Authority: WO
Inventors: 陈巧; 陈�全
Original assignee: 深圳技术大学
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2023-04-20

Abstract

A floodlight system for an anechoic room or a shielded room, comprising: an AC power supply (1), an enhanced differential mode filter circuit (2), a drive circuit (3), and an LED light board (4). The enhanced differential mode filter circuit (2) has a first end connected to the power supply and a second end connected to a first end of the drive circuit (3), and a second end of the drive circuit (3) is connected to the LED light board (4). The drive circuit (3) comprises: a resistor (R), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a fifth capacitor (C5), a sixth capacitor (C6), a seventh capacitor (C7), a first inductor (L1), a second inductor (L1), and a rectifier bridge (D). The system can reduce energy consumption, increase the service life of a lighting device, and eliminate the need for frequent replacement of lighting devices, thereby lowering the maintenance frequency of lighting devices and reducing potential safety hazards.

Description

A floodlight system for an anechoic room or shielded room

technical field

The utility model relates to the technical field of lamps, in particular to a projection lamp system used in an anechoic room or a shielding room.

Background technique

The lighting equipment in the anechoic room or shielding room generally adopts halogen lamps, while the radiation disturbance test in the electromagnetic compatibility test laboratory uses the national standard level 5 or military standard level test, which requires the bottom of the anechoic room and shielding room The noise is very low, and ordinary halogen lamps can hardly meet the noise floor requirements; and the lamps are installed on the top of the darkroom, and most of the halogen lamps are high-power lamps, which generate a lot of heat, consume a lot of energy, have a short service life, and often need to be replaced, which leads to maintenance The frequency is high, and the potential safety hazard is great.

technical problem

The main purpose of this utility model is to provide a floodlight system for an anechoic room or shielding room, aiming to solve the problem that the lighting equipment in the anechoic room or shielding room in the prior art cannot meet the noise floor requirements, and the maintenance frequency is high, Technical issues with major security risks.

technical solution

In order to achieve the above purpose, the utility model provides a floodlight system for an anechoic room or a shielding room, including: an AC power supply, an enhanced differential mode filter circuit, a drive circuit and an LED lamp board; the enhanced differential mode filter The first end of the circuit is connected to the power supply, the second end is connected to the first end of the driving circuit, and the second end of the driving circuit is connected to the LED light board; the driving circuit includes: a resistor, a first capacitor, a second The second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, the seventh capacitor, the first inductor, the second inductor, and a rectifier bridge; the first end of the resistor and the AC power supply pass through the strengthened The live wire end of the type differential mode filter circuit is electrically connected, and the second end is electrically connected with the first pin of the first inductance and the first end of the first capacitor; the first capacitor, the second end of the first inductance The pin is electrically connected to the neutral terminal of the AC power supply through the enhanced differential mode filter circuit; the third pin of the first inductor is connected to the first end of the second inductor and the first end of the rectifier bridge An AC end is electrically connected, the fourth pin of the first inductor is electrically connected to the second end of the second inductor and the first end of the third capacitor; the second end of the third capacitor is electrically connected to the The second AC end of the rectifier bridge is electrically connected; the positive end of the rectifier bridge is electrically connected to the second end of the fourth capacitor and the second pin of the second inductor, and the negative end of the rectifier bridge is electrically connected to the second terminal of the rectifier bridge. The first end of the fourth capacitor is electrically connected to the first pin of the second inductor; the third pin of the second inductor is connected to the fifth inductor, the sixth inductor, the seventh inductor, the The first end of the LED lamp board is electrically connected, and the fourth pin of the second inductor is electrically connected to the fifth inductor, the sixth inductor, the seventh inductor, and the second end of the LED lamp board. .

Further, the capacitances of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, and the seventh capacitor are respectively 0.68 uF, 0.1uF, 4~14uF, 0.1uF, 220uF, 104uF, 103uF.

Further, the first inductor is a UUF inductor with an inductance greater than 200mH; the second inductor is a common-mode amorphous inductor with an inductance greater than 300mH.

Further, the magnetic ring of the second inductor is an amorphous magnetic ring, the first inductor and the second inductor are covered with a magnetic field shielding film, and the first inductor and the second inductor are grounded.

Further, the magnetic field shielding film is aluminum foil.

Further, the LED lamp board is composed of 50-60 strings of LED lamp beads; the DC voltage of the LED lamp beads is 160V~180V.

Further, the third capacitor is 4uF, and the LED lamp power of the rectifier bridge is 30W, or, the third capacitor is 8uF, and the LED lamp power of the rectifier bridge is 50W, or, the third capacitor is 14uF, and the LED lamp power of the rectifier bridge is 75W.

Further, the enhanced differential mode filter circuit is a differential mode filter circuit including an electromagnetic compatibility filter.

Beneficial effect

The utility model provides a projecting light system used in an anechoic room or a shielding room. The beneficial effect is that it can convert alternating current, so that the power supply has the characteristics of constant current and linearity, so that the basic requirements for driving LED lights and the low background noise of the dark room can be achieved. Perfect combination, under the characteristic of constant current, even if the external voltage is as high as 250V or even 300V, the LED lamp will not burn out due to overcurrent, because this is a high internal resistance power supply, the internal resistance comes from capacitive reactance, and it does not generate heat. Thereby reducing energy consumption, increasing the service life, without frequent replacement, thus reducing the maintenance frequency of lighting equipment and reducing safety hazards.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a schematic block diagram of the structure of a floodlight system in an anechoic room or shielded room;

Figure 2 is a circuit diagram of the drive circuit.

In the accompanying drawings, each reference sign indicates:

1. AC power supply; 2. Enhanced differential mode filter circuit; 3. Drive circuit; 4. LED lamp board; R, resistance; C1, first capacitor; C2, second capacitor; C3, third capacitor; C4, first capacitor Four capacitors; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; L1, first inductor; L2, second inductor; D, rectifier bridge.

BEST MODE FOR CARRYING OUT THE INVENTION

In order to make the purpose, features and advantages of the utility model more obvious and understandable, the technical solutions in the utility model embodiment will be clearly and completely described below in conjunction with the accompanying drawings in the utility model embodiment, obviously , the described embodiments are only some of the embodiments of the present utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present utility model.

Please refer to Figure 1, which is a floodlight system used in an anechoic room or shielded room, including: AC power supply 1, enhanced differential mode filter circuit 2, drive circuit 3 and LED lamp board 4; among them, the enhanced differential mode The first end of the filter circuit 2 is connected to the power supply, the second end is connected to the first end of the driving circuit 3 , and the second end of the driving circuit 3 is connected to the LED lamp board 4 .

In this embodiment, the drive circuit 3 includes: a resistor R, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a An inductor L1, a second inductor L2 and a rectifier bridge D; the first end of the resistor R is electrically connected to the live wire end L of the AC power supply 1 through the enhanced differential mode filter circuit 2, and the second end is connected to the first lead of the first inductor L1 pin a, the first end of the first capacitor C1 is electrically connected; the first capacitor C1, the second pin b of the first inductor L1 is electrically connected to the neutral terminal N of the AC power supply 1 through the enhanced differential mode filter circuit 2; the second The third pin c of an inductor L1 is electrically connected to the first end of the second inductor L2 and the first AC end of the rectifier bridge D, and the fourth pin d of the first inductor L1 is connected to the second end of the second inductor L2, The first end of the third capacitor C3 is electrically connected; the second end of the third capacitor C3 is electrically connected to the second AC end of the rectifier bridge D; the positive end of the rectifier bridge D is connected to the second end of the fourth capacitor C4, the second inductance The second pin b of L2 is electrically connected, the negative end of the rectifier bridge D is electrically connected to the first end of the fourth capacitor C4, and the first pin a of the second inductor L2; the third pin c of the second inductor L2 is electrically connected to The fifth inductor, the sixth inductor, the seventh inductor, and the first end of the LED lamp board 4 are electrically connected, and the fourth pin d of the second inductor L2 is connected to the fifth inductor, the sixth inductor, the seventh inductor, and the LED lamp board 4 The second terminal is electrically connected.

In this embodiment, by using the enhanced differential mode filter circuit 2 and the driving circuit 3, the alternating current can be converted, so that the power supply has constant current and linear characteristics, thus perfectly combining the basic requirements of LED lamp driving with the low noise floor of the dark room , under the characteristics of constant current, even if the external voltage is as high as 250V or even 300V, the LED lamp will not burn out due to overcurrent, because this is a high internal resistance power supply, the internal resistance comes from capacitive reactance, and does not generate heat, thereby reducing Energy consumption is increased, the service life is increased, and frequent replacement is not required, thus reducing the maintenance frequency of lighting equipment and reducing safety hazards.

In one embodiment, the capacitances of the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are 0.68uF and 0.1uF respectively , 4~14 uF, 0.1 uF, 220 uF, 104 uF, 103 uF.

In this embodiment, the withstand voltage value of the third capacitor C3 is 400V, so that the AC power source 1 can be stepped down to perform bridge rectification.

In other embodiments, the third capacitor C3 may be 4uF, and the LED lamp power of the rectifier bridge D is 30W.

In other embodiments, the third capacitor C3 can also be 8uF, and the LED lamp power of the rectifier bridge D is 50W.

In other embodiments, the third capacitor C3 can also be 14uF, and the LED lamp power of the rectifier bridge D is 75W.

In one embodiment, the first inductor L1 is a UUF inductor with an inductance greater than 200mH; the second inductor L2 is a common mode amorphous inductor with an inductance greater than 300mH.

In one embodiment, the LED lamp board 4 is composed of 50-60 strings of LED lamp beads; the DC voltage of the LED lamp beads is 160V~180V.

In this embodiment, the LED light board 4 arranged in this way can achieve the effect of a small overall current, so that the volumes of the first inductor L1 and the second inductor L2 are not easily saturated even when they are small.

In one embodiment, the magnetic ring of the second inductor L2 is an amorphous magnetic ring, the first inductor L1 and the second inductor L2 are covered with a magnetic field shielding film, and the first inductor L1 and the second inductor L2 are grounded. In this embodiment, the magnetic field shielding film is aluminum foil.

In this embodiment, the amorphous magnetic ring is a magnetic ring made by VAC, and the amorphous magnetic ring is surrounded by a common-mode inductance with an inductance of 300mH, which is the second inductance L2 of this embodiment. Such a common-mode inductance can satisfy unsaturated conditions.

In this embodiment, the aluminum foil can better block the magnetic field. Since the type rectification will generate electromagnetic oscillations with a frequency in the range of hundreds of Hz to 30 MHz during the switching cycle, in general, this oscillation interference is far below the limits of various civil uses, but for the background noise of EMC anechoic rooms. Not allowed, using aluminum foil as a magnetic field shielding film can well suppress this low-frequency radiation.

In one embodiment, the enhanced differential mode filter circuit 2 is a differential mode filter circuit including an electromagnetic compatibility filter.

The above is a description of a floodlight system for an anechoic room or a shielding room provided by the present invention. For those skilled in the art, based on the idea of the embodiment of the present invention, both in terms of specific implementation and application range There will be changes. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

A floodlight system for an anechoic room or shielded room, characterized in that it includes:

AC power supply, enhanced differential mode filter circuit, drive circuit and LED light board;

The first end of the enhanced differential mode filter circuit is connected to the power supply, the second end is connected to the first end of the driving circuit, and the second end of the driving circuit is connected to the LED lamp board;

The drive circuit includes: a resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first inductor, a second inductor, and a rectifier bridge;

The first end of the resistor is electrically connected to the live wire end of the AC power supply through the enhanced differential mode filter circuit, and the second end is connected to the first pin a of the first inductor and the first end of the first capacitor Electrically connected; the first capacitor, the second pin b of the first inductor are electrically connected to the neutral terminal of the AC power supply through the enhanced differential mode filter circuit; the third pin of the first inductor Pin c is electrically connected to the first end of the second inductance and the first AC end of the rectifier bridge, the fourth pin of the first inductance is connected to the second end of the second inductance, the third The first end of the capacitor is electrically connected; the second end of the third capacitor is electrically connected to the second AC end of the rectifier bridge; the positive end of the rectifier bridge is connected to the second end of the fourth capacitor, the second The second pin b of the inductor is electrically connected, and the negative end of the rectifier bridge is electrically connected to the first end of the fourth capacitor and the first pin a of the second inductor; the third pin of the second inductor c is electrically connected to the fifth inductor, the sixth inductor, the seventh inductor, and the first end of the LED lamp board, and the fourth pin d of the second inductor is connected to the fifth inductor, The sixth inductor, the seventh inductor, and the second end of the LED lamp board are electrically connected.
The floodlight system for an anechoic room or shielded room according to claim 1, wherein the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the The capacitances of the fifth capacitor, the sixth capacitor, and the seventh capacitor are 0.68 uF, 0.1 uF, 4~14 uF, 0.1 uF, 220 uF, 104 uF, and 103 uF, respectively.
The floodlight system for an anechoic room or shielded room according to claim 1, wherein the first inductor is a UUF inductor with an inductance greater than 200mH; the second inductor is a common-mode amorphous inductor , the inductance is greater than 300mH.
The floodlight system for an anechoic room or shielded room according to claim 1, wherein the magnetic ring of the second inductor is an amorphous magnetic ring, and the first inductor and the second inductor are externally coated There is a magnetic field shielding film, and the first inductor and the second inductor are grounded.
The floodlight system for an anechoic room or shielded room according to claim 4, wherein the magnetic field shielding film is aluminum foil.
The floodlight system for an anechoic room or shielded room according to claim 1, wherein the LED lamp board is composed of 50-60 strings of LED lamp beads; the DC voltage of the LED lamp beads is 160V~ 180V.
The floodlight system for an anechoic room or shielded room according to claim 2, characterized in that,

The third capacitor is 4uF, and the LED lamp power of the rectifier bridge is 30W, or,

The third capacitor is 8uF, and the LED lamp power of the rectifier bridge is 50W, or,

The third capacitor is 14uF, and the LED lamp power of the rectifier bridge is 75W.
The floodlight system for an anechoic room or a shielded room according to claim 1, wherein the enhanced differential mode filter circuit is a differential mode filter circuit including an electromagnetic compatibility filter.