What control systems need to be considered in the design phase of an electronic
ID: 2078939 • Letter: W
Question
What control systems need to be considered in the design phase of an electronic product. Who is held responsible for the EMC behaviour of an electronic product? In a small electronic workshop, it is noticed that when a 'new' 3D printer is introduced into the room, a nearby printer connected to PC fails to work. If the 3D printer is turned off all is well. Discuss the approach you would take to identify the 'problem? What are the probable causes of Electromagnetic interference in a factory workshop that has a number of AC synchronous motors running, each connected to a wired data feed originating from a control room between 20m and 50m away. Discuss how this situation could be improved. What are the coupling paths within a typical office environment, where a variety of PC based apparatus are used? State three simple solutions to solving EMC problems? Why is there a need for EMC legislation and how is this enforced in the UK? What are the recommended circuit techniques for minimising possible EMC problems? Why do switch mode power supplies cause significant localised interference? Why are mains filters so commonly used, what two effects do they control?Explanation / Answer
(11) Most of the systems have nonlinear control so most cases nonlinear control systems are used.
There are open loop and closed loop control systems used in consumer electronic systems an open loop control system doesn't have any feedback provided to correct errors, whereas a closed loop control system has feedback so as to reduce the errors.
Some examples of closed loop systems are
air conditioner, automatic electric iron, servo motor.
Some examples of open loop control systems are
bread toaster, electric switch, automatic washing machine.
(12) EMC in an electronic circuit can be generated in a lot of ways the first pace is the source that is the power supply which cause audio frequency noise, transmission noise, amplifiers and loudspeakers can cause audio frequency noise.
Radio frequency noise is caused by wireless sets, micro controllers, radio and TV sets.
Communications signals like GSM, CDMA can cause broad band noise.
Pulse type noise are created by spark gaps and partial discharges from transformers, motors and generators and surges
(13) The first thing is the supply power if the printer could not draw enough current for driving then it would not turn on because printers require more power to work and as most power supplies work in parallel they would get the same voltage but not the same current, if this is the case just connect the printer to a supply from different phase both will work.
The next thing to check is whether the 3D printer is connected to the same PC as the PC would not be able to read both 3D printers at the same moment, only one will be working.
(14) electric motors cause repititive pulse type interferences which are caused due to small air gaps in the coils and they are always there in reduction of these noises is not possible after the motor is manufactured but they can be reduced from interacting with each other by reducing the interconnections with each other, increasing the effective distance between each motors and using filters to the data output or post processing the data and removing repetitive data that may be pulse type information
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