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Questions tagged [duty-cycle]

Duty Cycle is the ratio between duration of a pulse and the entire period of a (repeating) square wave, expressed in %.

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Run actuator at higher voltage and with lower dutycycles

I have an actuator which is rated at 12 VDC input voltage (0-15) with a maximum allowed duty cycle of 20%. The already existing voltage levels in my system are 5V and 22V, and since I am weight ...
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0answers
42 views

Calculating the Duty Cycles for the Syren 10A Motor Driver

I bought the Syren 10A to drive a Peltier element using python and a raspberry-pi zero + 12V power supply. After reading and talking I concluded to use the Driver in the R/C Failsafe Timeout Mode ...
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1answer
85 views

How to measure duty-cycle with Input Capture from STM32F103C8T6?

I'm trying to measure the duty-cycle of the 0-5V electrical PWM signal I have generated from the any source. How can I do this? Anyone can help me? IDE: Keil Microcontroller: STM32F103C8T6
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1answer
103 views

What is the physics behind width of the duty cycle in Arduino?

I was wondering if someone can tell me how Arduino changes the width of the duty cycle? How it produces an on-off pattern? I am looking for an explanation for modulation in this system.
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1answer
28 views

Determine MC34063AP Duty Cycle

A fuzzy area I want to clear up on the MC34063AP is Duty Cycle. In the MC34063AP datasheet, toff an ton are a result of 1 / f, which is obvious. toff is calculated by: 1 / f / ton / toff + 1 ton ...
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2answers
52 views

DC motor parameter identification using microcontroller

I've built a DC motor controller which measures the speed and current (not really sure yet about current values) of a permanent magnet DC motor. I plan to connect different PM DC motors. Is there a ...
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0answers
55 views

Optimal duty cycle in Forward converter?

So as far as I understand the Forward topology: The duty cycle set by the controller in CCM mode is constant assuming constant input voltage and constant output voltage. The duty cycle is independent ...
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4answers
421 views

Servo PWM: Why 20 ms period?

I'm working with ESC controllers which receive PWM signals that are very similar to those that control a standard Servo motor, i.e. a 50 Hz PWM signal (20 ms period) with duty cycle of 5-10% (1-2 ms ...
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1answer
69 views

Basic definition of duty cycle

Does the definition of duty cycle indicate only the percentage of time that the level is asserted? For example, if a 10 Hz square wave is de-asserted for 5 of those 10Hz cycles and asserted for 5 of ...
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3answers
276 views

how to make a square wave 1kHz circuit [duplicate]

i want to make a 5V oscillator that has a frequency of 1khz. it will basically go to 5V (HIGH) and then 0 V (low) in a frequency of 1khz with 50% duty cycle.
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2answers
90 views

Is it possible to generate different PWM Signals for same duty cycles(e.g. 50%)?

Let us expect we have a duty cycle of 50%. Is it possible to reach that duty cycle with different PWM Signals (waveform)? With different I mean variants in the number and lengths of the "active time". ...
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2answers
111 views

How to regulate PWM to control a boost converter

I am creating a simple boost converter following the classic circuit diagram just for learning purpose. The switch is a power transistor controlled by PWM output of an Arduino (with additional ...
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1answer
129 views

Defining contrast ratio and dimming ratio in a LED driver

I read in this article which analyze the contrast ratio achievable with switched mode LED driver system, that is defined as \$ \frac{1}{t_{on}} : 1 \$. Intuitively I can get that the minimum time ...
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0answers
35 views

Analysis of the full bridge bidirectional converter's buck mode operation?

This is the circuit I was trying to learn. Here is the equivalent of the buck mode operation: And following is the waveform in the buck mode of operation: My intention is to derive the output ...
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1answer
61 views

How can I add variable duty cycle PWM to a CircuitLab simulation within a question?

This is my first attempt to simulate a circuit in the time domain with CircuitLab. In order to ask a proper question about something similar driven with PWM, I'd like to add an adjustable duty cycle ...
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1answer
85 views

Control the duty cycle of my square oscillator

I Would like to know how i can control the duty cycle of my circuit. simulate this circuit – Schematic created using CircuitLab What is the best way to control the duty cycle ( from 1 to 99%) ...
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4answers
1k views

analog PWM signal

I am trying to get a PWM signal with adjustable duty cycle using only analog components, hence using a timer is not possible. Now I got one way of using it, using the triangle waveform and putting it ...
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1answer
465 views

Pulse generator with single op amp and diode

I want to design pulse generator with specific period and duty cycle. I found a pulse generator with single op amp and diode. I couldn't find information about how to calculate period and duty cycle. ...
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1answer
2k views

Driving servo motor with PWM signal

I want to drive servo motor with PWM signal.Servo motor rotation angle changes with the ratio of the duty cycle.Generally , servo motor rotation angle according to PWM can be seen in figure below. ...
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0answers
60 views

Fire alaram sound using PIC16F886

I am coding on a PIC16F886 IC. I am trying to generate a fire alarm sirene with a PWM signal. I have some questions as stated below. I copied code the from Example code My speaker circuit look like ...
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2answers
240 views

The logic schematic which can change the duty cycle of input

Is there a logic schematic can change the duty cycle of input ? I mean if input is a square wave with duty cycle is equal to 50%,and the output is also a square wave but its duty cycle become lower or ...
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2answers
1k views

independent control of frequency and duty cycle in 555 timer (formulas)

I want to control frequency and duty cycle of output pulse of 555 timer. I searched and find this schematic in a post in SOV but I don't know how calculate frequency and duty cycle in the circuit. ...
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0answers
306 views

sampling frequency for less duty cycle message signal?

I have a question regarding the sampling frequency ? Normally we will take 50% duty cycle square/ sine wave to explain about sampling frequecny/ nyquist theorem.. My doubt is what is he sampling ...
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2answers
819 views

how do I control duty cycle of a MOSFET using PI controller

I have designed a buck boost converter, how can I use a PI controller which will automatically change the duty cycle of the mosfet as per my desired output voltage or current? I have been fidgeting ...
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1answer
98 views

'Subcircuit is undefined' when designing PWM with TL493 in PSPICE

I am trying to design a PWM for my converter using TL493 in Pspice and i am getting an error. ERROR(ORPSIM-15108): Subcircuit model591_tl493 used by X_U1 is undefined i am a beginner to both ...
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2answers
1k views

Do 100% duty cycle buck converters have no voltage drop?

I am currently designing a circuit which should be able to take 12-28V DC power in and output 12V DC @ 1.5A. The question is: is this possible with a 100% duty cycle buck converter (like TPS54302)? ...
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1answer
62 views

Duty Cycle Demodulation Distortion Correction

I'm trying to come up with a system which will reliably convert an arbitrary input to a PWM signal, and then back again. The comparison signal is a 50kHz sine wave, and the result is fed through a ...
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3answers
3k views

Is there a way to sweep duty cycle over time in LTspice

I can sweep the frequency in time by using modulate, but I couldn't find any example on creating a varying duty cycle or a duty cycle is swept from zero to 100% at a given frequency f in a time ...
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1answer
183 views

Average voltage (pwm regulated) out of motor voltage range?

My DC brushed motor is rated 4.5V-15V. My application requires the motor to spin with different speeds so I am using PWM to regulated the it. I will be supplying the motor with a 12V battery and using ...
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4answers
837 views

100% Duty Cycle PWM

I recently had to build a filter to go from PWM to 0-5Vcc, and it got me thinking... At 100% duty cycle, the PWM used was 100% 5V output, DC voltage... If i used this PWM to, for example, switch a ...
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0answers
3k views

DC motor speed vs PWM duty cycle

I understand there have been quite a few posts asking about the DC motor speed vs PWM duty cycle issues. However, I found those questions different from what I want to ask, so I have to ask this topic ...
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1answer
1k views

555 - Adjusting frequency without affecting duty cycle

This seems to be some easy thing someone figured out already, but here I am after an hour of searching - and fearfully asking the question. My aim is to build a relatively simple 555 circuit using as ...
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1answer
73 views

How to keep a 110V appliance ON for 1 minute every 5 minutes, without arduino? [closed]

I need to turn ON an appliance (110V, 0.5A) for 1 minute every 5 minutes. The immediate solution that comes to mind is arduino/raspberry-pi and with a relay. What kind of circuits would help me ...
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1answer
54 views

Thyristor in a choppercircuit

I've the following kown values: Switching on loss is \$\text{E}_\text{on}\space\text{J}\$ in \$t_\text{on}=\tau_\text{on}\space\text{s}\$ Switching off loss is \$\text{E}_\text{off}\space\text{J}\$ ...
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1answer
1k views

IC Timer 555 Astable Multivibrator 50% Duty cycle

I'm given this configuration to solve for a IC-Timer 555 in astable mode to get a 50% duty cycle however I'm having some difficulties in the calculations. The circuit is modified a bit as shown. ...
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0answers
247 views

What difference a change in hertz vs duty cycle make to the pitch of a sound?

For example, 100 hertz sounds very low, but acquiring that from an online source that doesn't tell me the duty cycle doesn't answer my inquiry into whether a change in the duty cycle will affect the ...
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1answer
410 views

Pulse width modulation sensor circuit

This is the circuit of a PWM temperature sensor, I will give you some details about the circuit: The Electronic control Module which supply power (+8V) at terminal (A) The Electronic control Module ...
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1answer
73 views

mechanical oscilator concept to drive electric motor [closed]

I have been thinking about a project for some time now and am wondering how well it may work. I would like to make a sleve which could be run by a small electric motor ie from an old cd player or rc ...
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2answers
675 views

What is the influence of an asymetric load capacitance on a crystal duty cycle

I have a crystal oscillating at 25MHz (datasheet). The recommanded load capacitance is 18pF according to the datasheet. The crystal is connected to a component where the capacitance on the pin are ...
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2answers
173 views

Is a switching power supply likely to fatigue or burn out early if turned on or off quickly?

I'm working on a design for growing biomass where I need high power LEDs to switch on and off somewhere in the neighborhood of 1-30 times per second, so that they provide light to grow but don't ...
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1answer
109 views

Can't understand a variable in the formula used to determine CDTY to set duty cycle of PWM on cortex M3 (SAM3X8E)

I want to generate complementary PWM on an Arduino due. For that purpose I am programming the cortex M3 using the PWMC library. In order to set the duty cycle I have to set a value in CDTY channel ...
2
votes
2answers
144 views

High Current Pulse Opamp 2.5% Duty Cycle

I am driving an IR LED (LED914 and LED907) in series at 4.5 A for 2.5% duty cycle, In the 28 V I connect a DC supply and set the current to 150 mA, the idea is to continuously charge the capacitor C17....
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1answer
885 views

PSpice PWM duty clycle generation from PID controller

I am trying to implement an ideal PWM controller in for an analog circuit I have in ORcad PSpice. Ideally I would use the SLPS tool for simulink, but unfortunatelly we do not have the licence for it ...
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2answers
1k views

VHDL:CLOCK DIVIDER with duty cycle

I want to generate a 15MHz clock from a 60 MHz clock. The 60 MHz clock has a duty cycle of 50%. The output clock of 15 MHz must have 25% duty cycle. How the following code needs to be modified to vary ...
3
votes
1answer
139 views

Relaxation oscillator with two time constants

I have the following circuit and I have to find the duty cycle of the output signal and its frequency: I figured out that if \$v_{cond} > 0\$, then D4 will be forward biased and D3 reverse biased, ...
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1answer
1k views

VHDL - 10% Duty Cycle

I need to generate 500Hz from 50MHz clock frequency. I already got it. My problem here is how should the code to be adjusted if I want to change the duty cycle to 10%? Thank you. ...
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2answers
683 views

How to balance between frequency and duty cycle in this circuit?

I have this astable circuit that generate square waves with independent control of frequency and duty cycle: For this circuit: $$t_H=0.759\,C\,(R_f+R_y)$$ $$t_L=0.759\,C\,R_x$$ $$period = 0.759\,C\,(...
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2answers
939 views

IR Receiver(rx) not receiving a continuously signal from ir led(tx) rather than it receiving at first instant of time while transmitting

I m making line follower bot using sensor-(IR RX and IR led). Here is my Circuit for IR tX Circuit for rx This both circuit are working properly my problem is IR Rx not receiving signal continuously ...
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1answer
133 views

Duty cycle and electronic circuits

A function generator with an internal resistance of $$50\Omega$$ is set to produce a 1kHz square wave with $$20v_{p-p}$$ The duty cycle is 80%. The signal is run through a $$50\Omega$$ resistor. I ...
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5answers
3k views

555-timer circuit supposed to give 50% duty cycle square wave doesn't

I wanted to build a circuit that gives 50%-duty-cycle square wave. I built the circuit of figure 4.4.6 from this link which is shown below: I used the NE555 chip, and used a potentiometer instead of ...