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19 Threads found on Scr Speed
The circuit is completely wrong, fortunately you are operating it only in a simulation, otherwise you'll see a lot of smoke. With transistor opto couplers, you need a separate trigger power supply for each scr cathode node, four in this case. Trigger transformers are a usual means, also opto triacs (e.g. MOC3020) can work, they need a series rec
A Triac which works at 100Khz does not exist. Triacs are powerline frequency (50/60 Hz) only. Perhaps 400Hz. There are a few inverter-grade scr which can switch up to 10 Khz. But those are scrs, not Triacs.
Simple way :- use a relay as washing machine manufacturers do, else use four triacs. The other devices only work on DC. Though scrs will work on unsmoothed DC, you still need four. The other will work but the circuits are more complex.. Frank
I AM WORKING ON HARWARE DESIGN OF FULL WAVE FULL BRIDGE scr RECTIFIER.I AM USING THIS CODEOF ARDUINO TO GENERATE FIRING PULSES int inter=0; int inter1=1; double val; double time; double time1; int a=0,b=0,angle; void setup() { noInterrupts(); pinMode(9,OUTPUT); pinMode(10,OUTPUT); interrupts(); attachInterrupt(
Hello, I am trying to build a full wave controlled rectifier for 1 HP 180V 5.5A DC motor. Please guide me about how to proceed with design and how to choose which power device to use and what its rating should be? Hi Charukeshi Joglekar Your question seems so general . By full wave you mean scr controlled velocity control ?
Thyristors and triacs have been used for 3 phase motor speed control. The method is different. The AC is not rectified, snubbers and inductances are used to turn off the scr once it started conduction. You can search for cycloconverter to see how it works. Some schemes uses GTOs that are basically thyristors that you can turn off using the gate.
Hi, Long back I I have used a circuit to fire my flash gun to get some high speed photographs. It was a 9V. DC run LM324 and a scr based one with built in Delay control. So far I can recall, it was in early eighties. Most probably I got it in Electronics For You Magazine in India. It worked perfectly for long. But I have missed the gadget as well
A 555 timer IC can be made to vary duty cycle. Apply a varying voltage to the control The connection to ground is implied.
The most ancient speed controls used an L-pad. Simple, fairly low loss, and hard to find anymore. Inductive loads can be controlled by triac / scr dimmer styles but there is more voltage applied at the current-zero-crossing which the design has to accommodate (lamp dimmers have it easy). This is really just component selection (but you need to h
i am doing project on controlling the speed of motor by changing firing angle of scr. For this i am using a wireless remote to control the speed of motor. i want to knw the programming of this i can read data from tsop1738 and use it to control firing angle of scr. pls help me out!
Before IGBTs and mosfets, scr were widely used for dc motor control. I repaired a 'folk lifter motor controller' with a 48V, 275A DC motor. A 450A thyrister was used as controller unit and a 50A thyrister to generate pulse to switch it off. An optical encoder in accelerator controls the speed. A huge battery bank under the seat. If you want to c
My friend did you check speed of triac ? there is lots of CDI on Internet. Electronic Motocycle ignition CDI Honda C-90 This Circuit is for 4 cylinder motor, Electronic Motocycle ignition for CDI Honda C-90. Use small circuit but good work. scr 1 TIC106 Switching Component for drive ignition Coil to Sparkplug. Detail to see circuit. The
image above shows the torque vs speed relationship, and I can understand why it's like that (more speed = more cemf = less current = less torque). On the contrary, my scr controlled DC drive manual said that a DC drive could control a DC motor in a way that give constant torque from 0 r
Please anyone modify this circuit for 220V input.(If possible lable components value on load is 220V,1/3 HP, AC motor.Thanks in advance.
This form of speed control, can be finicky. Your trigger circuit is playing against the line (60Hz) phase. The scr (or TRIAC) trigger event -must- be applied at an angle prior to the zero-crossing because the zero- crossing is the only way these things shut off. Applying before the peak can also be bad. You would like the range of control to
Hi, I'm developing Motor speed Controller for Permanent Magnet Synchronous Motor(PMSM).I don't know why people love PWM so much for controlling the speed of the DC/AC motor.Every where I see is the PWM method for speed control, mostly in H-bridge manner equiped with transistors.I have my university final year project that is (...)
Anyone has any idea bout forced commutation for scr? I have designed a zero-crossing detector+ speed controller for scr to control separately excited dc motor. I use TCA785. Please help me on design forced commutation of scr. Which technique should I use? External pulse circuit is more appreciated. Thanks
I have managed to design a circuit with zero crossing detector+pulse transformer by using scr to control the speed of my separately excited dc motor. It is single phase and half wave control. I wish to ask is there any modification i can do on my circuit? For example adding commutation and braking system. Please advise. If possible give me some
Hi all I want to speed control my lathe at home. I am not a wizz in power electronics. Other than gating a scr or something like that is there a more intelligent way to control the speed of an AC motor, or would it be better to rather look for a DC replacement?