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Everyone electric Control Board
Everyone electric Control Board

Everyone electric Control BoardIn theEMCWorkaroundEveryone electric Control BoardIn theEMCWorkaround IntroductionEveryone electric Control BoardSmall size, low cost determines that it can not use high cost materials in the circuit to solve its electromagnetic interference problem. In fact, in actual use,Everyone electric Control BoardThe main interference from the three major aspects: one is the control board itself generated interference, the second is from the load interference, the third is from the line interference. The solution of these disturbances can be accomplished by different schemes.1Interference of the control Panel itself1.1Interference caused by the control Panel itselfEveryone electric Control BoardCommonly used relays, SCR and high-frequency clock, etc., may becomeEveryone electric Control Boardsource of interference.

For the above disturbances, the solution can be done from the following:

(1)In the relay coil to increase the continuation of the current diode to eliminate the disconnect coil generated by the anti EMF interference. 

(2)Spark suppression circuit at both ends of relay contact(is generallyRCSeries circuit, resistance general selection thousands of euro to tens, capacitor selection0.01μF)To reduce the electrical spark effect.

(3)On the board eachICAnd then a0.01μF~0.1μFHigh frequency capacitance to reduceICImpact on the power supply. But should pay attention to the wiring of high-frequency capacitance, line should be close to the power supply and as short as possible, otherwise, equal to increase the capacitance of the equivalent series resistor, and this will affect the filter effect.

(4)Wiring should be avoided90Degree polyline, and minimize high-frequency noise emission.

(5)At both ends of the SCR and connectedRCSuppressing the circuit and reducing the noise generated by the SCR(When the noise is severe, the SCR may be penetrated.)

(6) Everyone electric Control BoardAttention to crystal oscillator wiring. Crystal oscillator and chip pins should be as close as possible, and use ground to isolate the clock area, crystal vibration shell to be grounded and fixed. It is best to use low speed crystal in the occasion of low speed crystal oscillation.         

(7)Reasonable partition of circuit board(such as strong, weak signal, digital, analog signal)。 As far as possible the source of interference(such as motor, relay)and sensitive components(such as single chip microcomputer)From。

(8) Everyone electric Control BoardAC Terminal electric capacitance filter: Remove high-frequency low-frequency interference pulse,VCCandGNDThe electrolytic capacitor and ceramic capacitor are asked to remove the high and low frequency interference signal.

 


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