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40 Threads found on Voltage Controlled Pwm
basic theory is a DC motor speed is controlled by varying armature voltage(or field excitation). In BLDC , the the average voltage (DC) is (Ton/T)*Vin. By varying the Ton(pwm) you are varying the speed.
Hi everybody, I am currently trying to build a converter model for a DFIG. To get a faster computing time i want it to be in a state space model system. so my aim is to create the pwm on both sides, the grid side and the rotor side, with each two controlled voltage source. All this should be modelled on simulink. Unfortunately i cannot (...)
Does the overcurrent occur at a certain point in each mains waveform? When mains voltage amplitude is near zero (twice per cycle), is your amplitude high? Then that means your waveform is pouring current at the wrong point in the mains waveform. It could be a power factor issue.
In actual practice wouldn't you just set the maximum current and pwm the voltage to keep a constant current. A V/f operated inverter is voltage controlled, the current varies according to the load. Current limiting may be implemented as an auxilary function. It should be mentioned however that only few recent VFDs (...)
Hi, thanks for response, but i still don't get it how I can merge the INA210 in my new system. In place of VLED in the error amp, i have placed the output of the INA210 with the reference voltage maintain still nothing happens. Please for helps
I have wanted this for a long time now so I would just go ahead and ask. I would like to know if there is a cheap IC that directly takes in an analog voltage (say 0-10V or 0-5V) and converts it into pwm of desired switching frequency and duty cycle should vary from 0-100% according to the analog input. Now the traditional way of doing this is ma
pwm is generated by an electromechanical or electronical timer, switching the input to the high voltage transformer supplying the magnetron.
Hello, I want to learn somethings about DC-link voltage controller design for grid side AC-DC converter. Can someone say something about this?
YOu better review your Gate voltage levels for turn off and timing vs Threshold. Note detailed selection of RC+diode control of gate voltage. This following design uses fast turn Off and slow turn on. Dead time is critical, which is controlled in this
You can regulate either current or voltage at one time.
Hello, is there any way to make voltage fluctuate up and down in a cycle of 5 seconds? I am trying to make a small and simple circuit that makes a led dim in and out in a 5 second interval. example: 0 seconds- 0V 1 seconds - 2V 2.5 seconds- 4.5v 4 seconds- 2V 5 seconds- 0V
i am using a micropump which operates at 3-12 Vdc (Max 0.5 Amps). I need to control the speed of this pump by varying the voltage between 3-12V. my input voltage is from NI daq 6008 which ranges from 0-5V and output current drive is 5mA. I had tried to use a lm741 op amp with gain equals to 3 but it doesn't drive the pump. pls help me. this is th
here's a few ideas - drop the 0.3R to 0.1R if you mount all active devices on a CPU cooler with low speed fan. - use a series pass transistor as pwm controlled charger to maintain a lower voltage drop on the regulators or use a stock SMPS to maintain a 2 V drop on the linear regulator. - use a lower
Hi all, I am making an H bridge for a supply voltage range of 12V to 24V and a max current of 4A. The motor speed will be controlled by a pwm signal (>10kHz) provided by a PIC microcontroller. I noticed that for driving the gate people use gate drivers (because the gate has some capacitance and it needing more than 5V to fully switch (...)
Hello friends, I want to make power supply which is controlled by PIC mcu (with filtrated pwm outputs for current and voltage limit) and with LCD for show voltage and current measurements. I tried to find some good schematics for this and didn't succeeded :-(. I need IDEA how to do this. So, some internet links, or (...)
Hi everyone! i currently want to develop a bipolor stepper motor driver using a microcontroller and L298 IC. in past, i have developed microstepping driver using NXP89v51RD2 microcontroller and 4 TIP122 for unipolor motor. the firmware has a look-up table for 1/8 microstepping, 4 pwm signals which drives base of TIP122, at any time only two (
The section on the right is just a large voltage amplifier. As for the part on the left, I can't really tell without knowing specific component values.
Hi, Anyone who has experience with that how to get a pwm signal whose Puls should be controlled based one the I/P voltage ?5V Using simple OP-Amp ? Thanks in advance
Assuming your control pin at the fan is voltage controlled and, say, 100K impedance... This schematic may be what you want. If volt level absolutely must never go above 5.25 V, then use a 13K resistance instead of 12K.
Take a step back and ask what attribute of the solenoid you are trying to control. Current? voltage? Position? Flow? Get your mind right about feedback. There's plenty of options for power switches, drivers and so on. But these are only the nuts and bolts, and I don't see a plan.
voltage controlled oscillators based on the 555 series are well known. One way to do that with your MCU would be to generate a pwm output, then pass that through a low-pass D/A filter, say 10K and 10 uF (just a guess). Use that voltage output at the Control voltage pin (pin5) of the 555. Why would you (...)
Better working circuit based on same pwm function is achieved by comparing triangle wave against voltage set by potentiometer. Triangle wave is used because it has slope against time, so on time and off time is easily controlled. A capacitor is charged and discharged wi
I have a strobing LED that is controlled by a microcontroller via an N MOSFET. The strobing LED is carrying a modulated signal. The microcontroller will pulse the gate voltage of the MOSFET to turn the LED on and off. (see picture) 60972 A new design requires this LED to have adjustable intensity. Since the LED has a mod
Hello I want to convert this voltage controlled circuit in to potentiometer controlled circuit to obtain square waves, how can I do that? 60213 Danke Schön.
looks like voltage controlled pwm to me. PIC reading voltage value through ADC and feed it to pwm, so its duty cycle varies proportional to voltage.
How output of an inverter can be controlled? What is the need of voltage control of full bridge inverters?
In the first step convert 4-20mA to 1.0-to-5.0V using 250Ω resistor .. In the second step, apply this 1-5V control voltage to voltage controlled P(ulse) W(idth) M(odulator) = pwm .. Here are details of the voltage controlled pwm:
Hi, I have a question about the error amplifier in a voltage mode controlled buck converter. I designed a TYPE III erroramp with the correct transfer function to give me a stable loop in combination with the LC plant and the pwm modulator. According to the books, so to say. In simulation everything works fine, exept for one thing: the (...)
Hi everyone, I design a Boost circuit with specification: Input: 3.3v Output: 5v, 50mA After soft-start, the output voltage increases very high: around 18v. Then it decreases to 10v, but very slowly. How can I control the output voltage? Best Regard! Thanks
1. FISHER, NGO and KUO; ?A 500 KHz, 250 W DC-DC Converter with Multiple Outputs controlled by Phase SHifted pwm and Magnetic Amplifiers ? HFPC 1988 2. ANDREYCAK, W. ?Controlling Zero voltage Switched Power Supplies?; HFPC Proceedings, 1990 and any papers related to design of phase shifted zvs full-bridge dc-dc converter
Impossible without input voltage.
So i'm in the process of converting a voltage controlled device into a current controlled device which utilizes the PIC16C54C microcontroller. The original voltage controlled schematic involved using multiple ZVN3306FCT-ND MOSFET transistors which were controlled by the PIC. These MOSFETs (...)
i am fibished with ths job.. i did it using a voltage controlled oscilator integrated circuit called 8038. i amplified the output of the microcontroller using an octocoupler. i obtained the DC value of the pwm pulses using an R-C circuit.. then i fed this DC value to the 8038 integrated circuit. now by changing the duty cycle of the (...)
the pwm is a good idea, but if the contrast voltage is negative used a diode doubler circuit for negative voltage
Hey everyone.... Im working on a new one now and I just wanted to get some input.... Ive been thinking of building a "dummy" load for test. I am thinking of using a PIC16F676 to read and display voltage and current... I was thinking of using the pic to limit the current by using pwm and shunting a MOSFET through a limit resistor to ground. But I do
Hello, Can any body tell me what is the maximum allowable ripple voltage at the output of a DC-DC buck converter. Thanks Kasi
Hi to control the brighness you need to conrol current passing in the led. To do this you can either coontrol the current itself or to control the resistor through which the current is passing. To control current itself, you will use a voltage controlled current source where the voltage control signal is a low pass filtered version of (...)
The LM321 can work with the input voltage of 0V. What is the maximum voltage of your pwm I/P? I thiank this maybe not a safe salution.
if sinewave generator+power mosfet is pwm, regulator state can be removed to save energy and output voltage can be controlled by feedback output to pwm.
Feedback loop will regulate the o/p voltage and also stabilize the ckt. bimbla.