Odd a machine and digital circuit how interference rejection

01uF) , reduce electric spark effect. (3) adds filter wave circuitry to electric machinery, notice down-lead of capacitance, inductance wants as far as possible short. (4) circuit board go up to every IC wants and receive 0.

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High frequency capacitance of 1 μ F, in order to reduce the IC effect to power source. Notice the wiring of high frequency capacitance, should stand by even the line power source to carry and as far as possible dumpy, otherwise, be equal to the resistance of equivalent series connection that increased electric capacity, can affect filter wave result. (90 degrees of broken line shun when 5) wiring, reduce high frequency a confusion of voices. (Two end receive 6) silicon controlled rectifier RC restrains circuit, the noise that reduces generation of silicon controlled rectifier (when this noise is serious may the) puncture of silicon controlled rectifier. By the transmission of interference method can be divided disturb two kinds for conducted interference and radiate. Alleged conducted interference is to point to the interference that transmits sensitive parts of an apparatus through lead. The frequency band of noise of high frequency interference and useful signal is different, can cut off the transmission of noise of high frequency interference through the method of filter adding on lead, also can add segregation smooth Ou to solve sometimes. The harm of power source noise is the greatest, want special attention to handle. Faze of alleged spoke blackberry lily is the interference that shows through the space radiation transmits sensitive parts of an apparatus. Average means of settlement is the space that adds interference source and sensitive parts of an apparatus, keep apart them with ground wire and my shade is added on sensitive parts of an apparatus. 2, the commonly used measure that cuts off interference to spread way is as follows (1) mature power source is right odd an influence of machine. Power source is done well, the interference rejection of whole circuit solved one most. A lot of sheet piece machine is very sensitive to power source noise, should give sheet piece Electromechanical source adds filter wave circuit or manostat, be opposite in order to reduce power source noise odd an interference of machine. For instance, can use magnetism bead and circuit of wave of filter of form of capacitance composition π , 100 Ω resistor also can be used when conditional demand is not high of course replace magnetism bead. (If 2) is odd the I/O mouth of a machine uses the noise parts of an apparatus such as control electric machinery, segregation should be added between I/O mouth and noise source (increase) of circuit of wave of π form filter. Control the noise parts of an apparatus such as electric machinery, segregation should be added between I/O mouth and noise source (increase) of circuit of wave of π form filter. (3) notices brilliant brace up wiring. Brilliant brace up with sheet piece machine bring a foot to be stood by as far as possible, rise clock area segregation with ground wire, brilliant brace up crust ground connection is fixed. This measure can solve a lot of difficulty problems. (4) circuit board reasonable partition, be like strong, weak signal, signal of number, imitate. As far as possible interference source (be like electric machinery, relay) with sensing element (like sheet piece machine) be far from. (5) keeps apart digital area and simulation division with ground wire, want depart with imitate ground, received finally at power source ground. Wiring of chip of A/D, D/A also is a principle with this, this requirement already considered when chip of manufacturer allocation A/D, D/A brings a foot to arrange. (6) is odd a machine and big ground wire want alone ground contact, in order to reduce mutual interference. High-power parts of an apparatus is put in circuit as far as possible board the brim. (7) is in odd piece machine I/O mouth, power supply cord, the crucial place such as circuit board jumper uses interference rejection component to be like filter of annulus of magnetism bead, magnetism, power source, screen cover, can show the interference rejection performance that improves circuit. 3, the interference rejection performance that improves the interference rejection function of sensitive parts of an apparatus to raise sensitive parts of an apparatus is to point to parts of an apparatus of Cong Min feeling here the collect that considers to reduce pair of interference noise as far as possible, and never the method that whack restores as soon as possible. The commonly used measure that improves performance of interference rejection of sensitive parts of an apparatus is as follows: (The area of loop annulus reduces as far as possible when 1) wiring, in order to reduce inductive noise. (When 2) wiring, power supply cord and ground wire want as far as possible thick. Except reduce pressure outside falling, more important is to reduce coupling noise. (3) to sheet piece the I/O mouth with unused machine, not impending, want ground contact or receive power source. The unused end of other IC issues ground connection in the condition that does not change systematic logic or receive power source. (4) is right odd a monitoring of machine use power source and watchdog circuit, be like: IMP809, IMP706, IMP813, x25043, x25045, can improve the interference rejection performance of whole circuit substantially. (5) can satisfy the premise of the requirement to fall in speed, reduce sheet as far as possible piece the brilliant of machine brace up and choose circuit of low speed number. (6)IC parts of an apparatus as far as possible direct solder is on circuit board, use IC less. Say the experience in this respect again next. Software side: 1, often become complete Qing Dynasty of unused code space " 0 " , because this is equivalent at NOP, can run in the program;2 of the homing when flying, jumping turn a few NOP are added before the instruction, the purpose is the same as 1;3, software imitate WatchDog can be used when having hardware WatchDog, the moving;4 with monitoring a program, when involving processing to parameter of exterior parts of an apparatus is adjusted or be installed, can time to prevent exterior parts of an apparatus to make mistake because of sufferring interference send parameter afresh, can make exterior parts of an apparatus restores the interference rejection in correct;5, communication as soon as possible so, can increase data desired result, can adopt 3 take 2 or 5 take 3 strategy;6, when having communication line, if I^2C, 3 lines are made,wait, actual in we discover normal of Data line, CLK line, INH line buy is tall, effect of its interference rejection wants feel well buy to be low. Hardware respect: 1, the ministry line affirmation of ground wire, power supply cord is important! 2, of circuit go occasionally component of every the apart;4 of ground of;3, number, model, number is between the ground and power source want 104 capacitance;5, the occasion uses in what have relay, especially when big electric current, prevent relay to touch ignition to spend the interference to circuit, can be in relay between coil and one 104 with diode, mix in contact constant germinant and indirect 472 capacitance, the result is right! 6, it is those who prevent I/O opening to string together faze, can keep apart I/O mouth, the method has diode the;7 such as segregation, door circuit segregation, light idol segregation, electromagnetism segregation, multilayer of course board interference rejection affirms feel well, but cost is high however severalfold. 8, any methods that choose the parts of an apparatus with strong capability of an interference rejection to compare are effective, this bit should be the most important. 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