Db__ 3.82__pwm controller annoying whistle 79

PWMing on SYSFAN4 makes a very annoying high pitch whistle noise on low fan rpms … Pulse width modulation for power converters principles and practice tested with various fans. Pulse width modulation techniques Controlling fans (including CPU fan) by speedfan is a savior, but on this board, cant control the cpufan with speedfan for the love of me, so settled by using SYSFAN1 for cpu which works like a charm. Simple pulse width modulation circuit SYSFANS 2,3,5 are not responding to speedan at all whatsoever, big bummer.

SYSFAN4 is the only other one that responds to speedfan but is producing this very annoying noise on low % percentages … Pulse width modulation using op amp from what i read that looks like typical behavior of bad pwm controllers or poorly implented ones ?

Seal Lee,The 7344 sets the PWM frequency by downcounting an onboard clock by a user selectable factor.


Pulse width modulation applications 50Hz is not one of the standard frequencies available. Pulse width modulation vhdl You could get a frequency of 50Hz by using the external clock feature documented in the Flexmotion Software Reference Manual, however I think is probably not a good solution.http://www.ni.com/pdf/manuals/321943b.pdfAs I understand it, RC hobby servos require a 1-2 ms control pulse repeated every 20ms or so (50Hz). Pulse width modulation lab experiment A 1ms pulse represents one end of travel and 2ms represents the other end. Pulse width modulation raspberry pi The 7344 PWM duty cycle is specified as a value from 0 to 255, where 256 equals 100%. Led pulse width modulation A few simple calculations will show that this gives roughly 10 distinct positions for your servo, which is not very good resolution.http://www.epanorama.net/documents/motor/rcservos.?htmlYou will probably be much happier using a dedicated counter/timer board such as the NI 660x or even an MIO board, such as any of the E Series DAQ cards. Advantages and disadvantages of pulse width modulation Any one of these will provide a control pulse with far better resolution than any RC hobby servo available, thus the board will not be a limiting factor.Best Regards,Brent RunnelsApplications EngineerNational Instruments

The problem is if i pass the values every 10 micro sec, i am not able to generate PWM signal, but if i change rate to 10 milli sec, then its working perfect i am able to generate PWM properly. Pulse width modulation amplifier Please anyone suggest me what i should do and tell me if their are any benchmarks for loop rates which i should consider.Please do refer the vi’s if required.

The problem is if i pass the values every 10 micro sec, i am not able to generate PWM signal, but if i change rate to 10 milli sec, then its working perfect i am able to generate PWM properly. Pulse width modulation for power electronic converters Please anyone suggest me what i should do and tell me if their are any benchmarks for loop rates which i should consider.Please do refer the vi’s if required.

In this Pin No 5 and Pin No9 are PWM1 and PWM2 respectively.Now I have used to VI PWm duty and config PWM. Pulse width modulation formula I am seeing the PWM waveform on CRO.But to my surprise the output is not matching the required data.

IF you go for HElp and click config PWM VI block , you can see a table given where the internal clock selected corresponds to a particular frequency in 734X and 735X.Now since I am using 7344 my frequency should match with 734X table , whereas this is not happening and

TongY, the following is the program I mentioned and used, which is provided in the attached paper titled “Triggering with NI-VXI”.Appendix BExample Using the TIC Counter to Implement a ProgramDelayOn a PC platform, most languages include a delay function to temporarily halt the execution ofthe program for a specified amount of time. Pulse width modulation advantages and disadvantages These functions rely on the PC system clock whichruns at 18 Hz, resulting in a 55 ms resolution timer. Unipolar pulse width modulation In some situations, it is necessary to have adelay function with a higher resolution. Pulse width modulation adalah The following program creates a delay function with aresolution of 1 ms for use in a standalone DOS executable. Define pulse width modulation It takes advantage of the TIC counterto interrupt the program every 1 ms. Pulse width modulation thermostat Of course, there are several ways in which to have the TICchip provide this feature, but this one requires only the TIC counter and no trigger lines.Another advantage of this function is that it does not require any special setup. Pulse width modulation and demodulation experiment All you need todo is call TIC_Delay() as you would normally call the Delay() function.#include “nivxi.h”#include “stdio.h”#include “process.h”#define CONTROLLER -1#define SET_TRIG_HNDR 1U14#define GET_TRIG_HNDR 50#define SYNC 4#define CLK10 70#define ONE_MS_COUNT 10000U /* number of CLK10 cycles that = 1 ms */#define NO_ERROR 0static int16 ret;/* Interrupt Flag and Function */static int delay_flag=0;NIVXI_HQUAL void NIVXI_HSPEC delay_intr_handler (int16, uint16, uint16);NIVXI_HQUAL void NIVXI_HSPEC (*old_handler) (int16, uint16, uint16);/**************//* TIC_Delay — 1 ms res. Wiki pulse width modulation delay function using interrupts/**************/int TIC_Delay (uint16 count){uint16 loop;/**//* Enable the Interrupts. Pulse width modulation diagram Notice the return codes have an/* extra number subtracted to more easily identify the/* function that returned the error code./* Also notice that the old handler is retrieved first so that/* it may be reinstalled at the end of the delay function./**/old_handler = GetTrigHandler (GET_TRIG_HNDR);ret = SetTrigHandler (SET_TRIG_HNDR, delay_intr_handler);if (ret0) return ret;ret = TrigCntrConfig (CONTROLLER, 0, CLK10, ONE_MS_COUNT);if (ret0) return ret – 200;ret = EnableTrigSense (CONTROLLER, 50, SYNC);if (ret0) return ret – 400;/**//* Respond to count interrupts./**/for (loop=0; loopwhile (!delay_flag); /* Waiting for interrupt */delay_flag = 0;}ret = DisableTrigSense (CONTROLLER, 50);if (ret0) return ret – 800;ret = SetTrigHandler (SET_TRIG_HNDR, old_handler);if (ret0) return ret – 1000;return 0;} /* END TIC_Delay () */NIVXI_HQUAL void NIVXI_HSPEC delay_intr_handler (int16 controller, uint16 line, uint16 type){delay_flag = 1;/* Reset the 16-bit Counter */TrigCntrConfig (CONTROLLER, 2, CLK10, ONE_MS_COUNT);} /* END delay_intr_handler */void main(void){/* It is not recommended to call InitVXIlibrary() in the *//* Delay function because the overhead on InitVXIlibrary() *//* can be fairly large. Operation of pulse width modulation */ret = InitVXIlibrary();if (ret0) {printf (“Init Failed
“);exit (-1);}/* Delay for 1 ms */printf(“First for 1 ms…
“);TIC_Delay (1);/* Delay for 100 ms */printf(“Done, now for 100 ms…
“);TIC_Delay (100);printf(“Done!
“);ret = CloseVXIlibrary();}

1. Multiple pulse width modulation Supports duty cycle modulation2. Pulse width modulation for power converters pdf Supports varying output intervals3. Pulse width modulation definition Supports two power management modes, full on and full offThe PWM driver outputs the toggling signal whose frequency and duty cycle can be modulated by programming the appropriate registers, please check your correct configuration for the IOMUX, The i.MX25 platform contains four PWM modules. Pulse width modulation circuit for hho PWM1 is conflicted with the interrupt from the Debug board. Pulse width modulation inverter pdf Therefore, this PWM can be used if the Debug board is not attached. Pwm pulse width modulation definition PWM2 is used for USB OTG. Sinusoidal pulse width modulation pdf PWM3 is used for USB OTG. Pulse width modulation servo PWM4 is conflicted with the LCD and CAN

Hi, I have a set of Scythe Ultra Kaze fans that need some controlling, and my MSI board just isnt doing it. Pwm pulse width modulation I know that the prefered method of fan control is through PWM fans (well after a few hours of googling I found this out) but Im hoping that there is still some way to use this motherboard (through either software or bios) to control my 3 pin fans. Pulse width modulation led dimmer I dont care for automation or anything like that, I just need to set my fans at around 50-60% power so that the noise isnt too bothersome.

Ive tried getting speedfan to work and no luck, Ive also tried the command center with no luck. Pulse width modulation inverter design I dont want to get a fan controller unless it can be tucked away behind my motherboard simply because I dont want the aesthetics of my PC to go down the drain with either a fan controller in the back panel or the front panel. Pulse width modulation frequency Plus, spending extra money to do something all my other motherboards have been able to do so far is just annoying.

currently I am trying to control an electric motor through it’s controller. Pulse width modulation pwm This ontroller needs PWM signal 24V max as a speed control. What is pulse width modulation pdf Unfortunatelly I have the PXI with the NI card 6528 which doesn’t have counter outputs. Pulse width modulation principle I need there 100Hz. Pulse width modulation of z source inverters Is ist possible to use this card to control this motor? If it is possible, how should I programm it? I have also a NI card 6230, which has counter outputs, thus there are only 5V on counter output, I prefere using 6528 card instead of going into electronic to build an circuit for 6230.

Im trying to control a Vex Motor Using a PWM generator VI in the FPGA of the sbrio 9636, and I output this signal to Pin 5 of the Digital I/O Pin. Pulse width modulation using microcontroller Our PWM parameters are 5% duty cycle with a frequencyof 50Hz. Pulse width modulation circuit using op amp The output of the PWM is very clean, but its very unstable as the duty cycle changes substantially and the signal itself flickers on and off when measured through an oscilloscope. Pulse width modulation dc motor control circuit I’ve used this signal to drive a vex motor but the motor does not drive well at all. Modified sinusoidal pulse width modulation I know its not the motor controller and the motor itself as I have inputted a pwm signal from a waveform generator with the same parameters and the motor runs smoothly. Pulse width modulation graph Is there a way to make the PWM output from the sbrio more stable ?

First a little philosophical discussion about PWM. Practical applications of pulse width modulation When your designers demand an instantaneous measurement of PWM that is synced to encoder changes, it is not only impossible to do such a measurement directly with your data acq hardware, it is also impossible in a certain conceptual sense. Single pulse width modulation At any given instant, digital PWM is either 0 or 100 depending on whether the digital state is low or high.

Clearly, that’s not useful information. Pulse width modulation arduino code The information that *is* useful is to describe PWM over an *interval* of time, not at an instant. Pulse width modulation output Your data acq hardware can only perform such measurements based on the transitions of the PWM signal, which will NOT be sync’ed to the encoder transitions. Pulse width modulation techniques ppt In order to produce meaningful PWM data at the encoder transition instants, you must:

B. Pulse width modulation pdf Perform software processing (curve fitting, interpolation, etc.) to *estimate* a PWM value at the desired instants. Pulse width modulation ppt If I were the designer, I’d use the PWM value for the most recently completed interval, but you’ll have to work out the details with them.

D. Pulse width modulation lab manual You may need to have the tasks operate from a single master timebase. What is pulse width modulation Overall, this is simplest conceptually as you can start the other 3 tasks first, then when you start the timebase they are guaranteed to share the same timing. How does pulse width modulation work The DAQmx programming for this is a bit more advanced, but possible.

If you’re comfortable with a whole lot *more* software post-processing, there’s a method that might be easier to program on the hardware. Pulse width modulation circuit using 555 timer Your 6221 could capture transitions of both the encoder A,B transitions and the PWM transitions using a Digital Input task and the “change detection” capability. Pulse width modulation using 555 timer ic You would then be able to have your analog task use the “Change Detect Event” as its sample clock. Pulse width modulation 555 You’d also need to have a counter measure periods between those change detection event pulses in order to create a timescale for your data.

You would need to do a lot of careful processing of the digital data you get to find encoder transitions vs. Sine triangle pulse width modulation PWM transitions, and also consider the occasional case where they may be simultaneous.

When it comes to graphing, you need to be sure to use an XY graph. Pulse width modulation theory pdf Then each set of Y measurements requires you to define a corresponding set of X values. Pulse width modulation led dimming But, yes you can have one XY plot with 70 points overlaid with another plot having 1000 points.

I am currently writing a VI to a USB-6215 that will use a PID controller to alter the PWM duty cycle for a 12V case fan using the difference in percentage of two humidity sensors. Pulse width modulation nptel Addtionally, there is a similar process that will measure the difference between two thermocouples and use a PID controller to alter the PWM duty cycle to a 12V Peltier heating device.

I have done some research on the forums here and understand that using theUSB6008 for PWM is a non-starter. Types of pulse width modulation techniques SoI want to use a analogue output from USB6008 as an input into the PWM control board and then ill beable to adjust the duty cycle using a dial. Pulse width modulation using ic 555 This PWM controller will then be used to switch the SSR, turning the heat element on/off.

The issue i currently have is that this controller will not function with the analogue output from DAQ. What is pulse width modulation pwm I realise that the USB6008 only supplies an output voltage max of 5v, so i need some suggestions of how to boost the analogue output voltage so it can power this controller.

I am currently tackling a similar task. Pulse width modulation labview I set up a heat tank to maintain a desired temperature, monitored by a thermocouple, fed into PID inside LabVIEW, then its output is used to ‘Generate Signal’ inside LabVIEW to make PWM signal, which toggled an SSR connected to a heat tank’s heating element. Theory of pulse width modulation and demodulation I didn’t use a external PWM controller, since LabVIEW was able to make the PWM signal. Pulse width modulation circuit pdf I got it working up to +5, -3 degrees to my set temp. Carrier based pulse width modulation The overshoot was asymmetrical due to the asymmetrical heat capacitance, so I hooked the dt out from PID control to use different PID variables when its heated up then cooling down, resulted little better set temperature. Pulse width modulation waveform Since its a heating element, with very slow response (my gain was 35~45), it was little hard to nail it compared to mechanical element. Pulse width modulation for power converters principles and practice download I used LabVIEW 12, with compactDAQ 9485 (SSR) and 9211 (thermocouple) in 9174 chassis.

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