The introduction of common mistakes in the use of power filter

In the experimental test process, we often encounter such a situation: Although the design engineer in the equipment power line connected to the power filter, but the device still can not pass the "conducted disturbance voltage emission" test, engineers suspect that the filter filter effect is not Well, if you change the filter continuously, you still can't get the desired result.

The reasons for the analysis of excessive equipment are nothing more than the following two aspects:

1) Harassment caused by equipment is too strong;

2) Insufficient filtering of the device.

For the first case, we can solve the problem by taking measures at the harassment source to reduce the intensity of harassment, or increase the order of the power filter, and improve the ability of the filter to suppress harassment. For the second case, in addition to the filter itself is not good, the filter is installed on it

The performance of a large impact. This is often overlooked by design engineers. In many tests, we can change the way the filter is installed.

Make the device pass the test successfully. Below are some examples of common filter mis-installation effects on filter performance.

1 input line is too long

After the power cords of many devices enter the chassis, they are connected to the input of the filter through long wires. For example, the power cable is input from the rear panel of the chassis, goes to the front panel power switch, and goes back to the rear panel to receive the filter. Or the filter is installed far from the entrance of the power cord, causing the lead to be too long. As shown in Figure 1.

Figure 1 The power line is too long

Because the lead from the power inlet to the input end of the filter is too long, the electromagnetic disturbance generated by the device is recoupled to the power line through capacitive or inductive coupling, and the higher the frequency of the disturbing signal, the stronger the coupling, resulting in failure of the experiment.

2 filter input and output lines in parallel

Some engineers often bundle cables to make the cables inside the chassis beautiful. This is not allowed for power cables. If the input and output lines of the power filter are parallel-lined or bundled together, due to the distributed capacitance between the parallel transmission lines, this wiring method is equivalent to connecting a capacitor between the input and output lines of the filter to harass. The signal provides a path that bypasses the filter, resulting in a drastic drop in the performance of the filter and even failure at high frequencies (as shown in Figure 2). The size of the equivalent capacitor is inversely proportional to the wire distance and is proportional to the length of the parallel wire. The greater the equivalent capacitance, the greater the effect on the filter performance.

Figure 2 Influence of parallel traces on the filter

3 filter bad grounding, the filter housing and the metal chassis without overlapping good

This situation is also more common. When many engineers install the filter, there is a bad connection between the filter housing and the chassis (with insulating paint); at the same time, the ground wire used is long, which will cause the high-frequency characteristics of the filter to deteriorate and reduce the filtering performance. Due to the long ground wire, the distribution of the wire at high frequencies

The inductance can't be ignored, if the filter lap is good, the interference signal can be directly grounded through the shell. If the filter housing and chassis are overlapped

Bad, which is equivalent to a distributed capacitance between the housing (ground) of the filter and the chassis, which will result in a large grounding impedance of the filter at high frequencies, especially

Near the frequencies where the distributed and distributed capacitances resonate, the ground impedance tends to infinity. The effect of bad filter grounding on the filter performance is shown in Figure 3.

It can be seen from Fig. 3 that due to the poor grounding of the filter and the large grounding impedance, some of the disturbance signals can pass through the filter. In order to solve the bad bonding, the insulating paint on the chassis should be scraped off to ensure that the filter housing and the chassis have a good electrical connection.

510 Cartridge

·Basic precautions

Do not put expensive oil into low-quality cartridges to avoid wastage. Most pre-filled oil cartridges have the so-called 510 thread. The oil cartridge screws onto a rechargeable battery. Some of these batteries have buttons and some heat up automatically when you pump the oil. Some batteries have multiple temperature settings and some heat up to a preset temperature; these features need to be known in advance.

·Cleaning notes

Use a suitable cleaning tool to clean them, such as activated charcoal or dried tea leaves in a used pipe to absorb the oil. It is important not to use alcohol or other boiling water to clean the pipe, and to wait until it has cooled down completely before cleaning. Otherwise, the hot stem will come into contact with the watery liquid and cause the mouthpiece tenon to loosen, thus shortening the life of the 510 cartridges.

This is what you should be aware of when using 510 cartridges. At the same time, when using 510 cartridges, there are still some vaping tips, for example, when using them, be careful not to suck too hard, will not produce smoke. When you inhale too hard, the smoke is sucked directly into your mouth and not atomized by the atomizer, so gently inhaling is more powerful and gives you a better vaping experience.

510 Cartridge Oem,Leakproof 510 Cartridge,510 Battery And Cartridges Oem,510 Cartridge

Shenzhen MASON VAP Technology Co., Ltd. , https://www.masonvap.com