EMI constant current power supply filter module and preparation method thereof
A filter module and constant current power supply technology, applied in welding equipment, electrical components, manufacturing tools, etc., can solve the problems of complex structure of constant current power supply, poor anti-electromagnetic interference ability, etc.
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[0033] The invention provides a preparation method of an EMI constant current power supply filter module, comprising:
[0034] 1) Solder the components on the front side of the filter circuit substrate to make the filter circuit board 2 (such as Figure 8 and 9 , where C1-C9 is a capacitor, D1 is a diode, and T1-T2 is a common-mode inductor);
[0035] 2) Put shell 1 (such as Figure 2-5 ) and cover plate 3 (such as Figure 6 and 7 ) for preheating, and then apply tin to the joint between the shell 1 and the cover plate 3;
[0036] 3) cleaning the filter circuit board 2, the tin-coated shell 1 and the cover plate 3 in ethanol, and then baking;
[0037] 4) coating the silicone rubber composition on the back of the filter circuit board 2, and then performing drying treatment;
[0038] 5) Place the dried filter circuit board 2 in the casing 1 and preheat it, then solder the preheated filter circuit board 2 to the casing 1 through the pad 4, and then weld the lead wire 5 to t...
Embodiment 1
[0059] 1) Put components (such as Figure 8-9 C1-C9, D1, T1-T2 in the above) are welded on the front side of the filter circuit substrate by 183 ℃ tin soldering wire to make the filter circuit board 2;
[0060] 2) Put shell 1 (such as Figure 2-5 , with a silver-plated layer on the surface) and cover plate 3 (such as Figure 6 and 7 , with a silver-plated layer on the surface) preheated at 100°C for 3 minutes, and then tin-coated the surroundings and side edges of the shell 1 and the surroundings and side edges of the cover plate 3 through solder wires at 120°C;
[0061] 3) Clean the filter circuit board 2, the tinned casing 1 and the cover plate 3 in ethanol, and then bake them at 70° C. for 5 minutes;
[0062] 4) Coating the silicone rubber composition on the back of the filter circuit board 2, and then drying at 70° C. for 60 minutes;
[0063] 5) Place the dried filter circuit board 2 in the housing 1 and preheat it at 150°C for 3 minutes, then pass the preheated filter...
Embodiment 2
[0068] 1) Put components (such as Figure 8-9 C1-C9, D1, T1-T2 in the above) are welded on the front side of the filter circuit substrate by solder wire at 180-185°C to obtain the filter circuit board 2;
[0069] 2) Put shell 1 (such as Figure 2-5 , with a silver-plated layer on the surface) and cover plate 3 (such as Figure 6 and 7 , with a silver-plated layer on the surface) preheated at 100°C for 2 minutes, and then tin-coated the surroundings and side edges of the shell 1 and the surroundings and side edges of the cover plate 3 with a solder wire at 115°C;
[0070] 3) Clean the filter circuit board 2, the tinned shell 1 and the cover plate 3 in ethanol, and then bake them at 65° C. for 4 minutes;
[0071] 4) Coating the silicone rubber composition on the back of the filter circuit board 2, and then drying at 65° C. for 50 minutes;
[0072] 5) Place the dried filter circuit board 2 in the housing 1 and preheat it at 140°C for 3 minutes, then pass the preheated filter ...
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