Marko Gulin
  • Member for 5 years, 6 months
  • Last seen this week
What exactly is SVPWM? Is it used in grid-tied inverters?
Accepted answer
9 votes

It is a space-vector PWM modulation. It is superior to sine-wave modulation in a way that better utilizies the DC link voltage by adding triangular waveform at frequency three times the fundamental ...

View answer
What is difference between noise and disturbance in control system?
4 votes

According to your image, disturbance acts on a controller output, while noise acts on a process output. Take a moving vehicle for example - obstacle on the road would be a noise, and some (unexpected)...

View answer
Can polarized capacitors be used for negative voltage generation?
Accepted answer
4 votes

The only rule for polarized capacitors, such as electrolytic, tantalum etc., is that a potential on a positive (\$+\$) terminal is higher than the potential on a negative (\$-\$) terminal. If you ...

View answer
What kind of jumper wires are used with a breadboard?
Accepted answer
4 votes

From my experience, you should get all three types. Most of the time you will be using male-to-male and male-to-female. Since using wires for breadboard connections can create quite a mess on the ...

View answer
How do RC delay circuits work?
Accepted answer
3 votes

To understand this, you need to know the neon lamp impedance. If the load is purely capacitive, then when the switch closes it charges both capacitors at the same time. Voltage on both capacitors is ...

View answer
How to connect RS485 Device to computer in Modbus RTU
Accepted answer
3 votes

If your computer doesn't support RS485 protocol, and if we're talking about regular PC's it most probably doesn't, then you cannot directly connect A and B to serial port. I would suggest using an USB-...

View answer
How to select series resistor for a Zener Diode
Accepted answer
3 votes

First, you have to consider that every (Zener) diode has a power rating. From this power rating, you can calculate a maximum current for the diode. E.g., if a Zener diode has a maximum power rating of ...

View answer
Question about electrical power in circuits
2 votes

Yes, current sources can sink current. But be aware, not all current sources can sink current! For example, commercial laboratory power supplies can operate as constant voltage or constant current ...

View answer
simplify boolean function
Accepted answer
2 votes

The error is in line 3. It should be like this: $$\overline{(x_3+x_2)x_2} = \overline{(x_3+x_2)} + \overline{x_2} = \overline{x_3} \cdot \overline{x_2} + \overline{x_2} = \overline{x_2} (\overline{...

View answer
Divide 32-bit by 16-bit number on a dsPIC
Accepted answer
2 votes

I managed to find a solution. Apparently, there is a dozen of __bultin functions used to force the compiler (xc16) to use specific assembly instructions or series of instructions. For example, to ...

View answer
dsPIC33E - I2C master interrupt flag is never set
Accepted answer
2 votes

I managed to solve this problem. When you halt the processor in the middle of the I2Cx communication with a slave, the slave might hold the SDAx line low on next start (or restart), in that way ...

View answer
do I need a current source to load an electrolytic capacitor?
2 votes

Honestly, I don't understand what do you mean. Capacitors are charged with charge carriers (electrons), and a source of these electrons can be either a voltage or a current source. Please be careful -...

View answer
Signals and systems - Does y(n-1) affects when I check the system for linearity?
Accepted answer
1 votes

The trick is to consider the \$y[n-1]\$ and \$x[n-1]\$ signals as if they were some new signals not related to \$y[n]\$ and \$x[n]\$. Introduce the following substitutions: $$y[n-1] = w[n], \quad x[n-...

View answer
RL-circuit using Laplace
Accepted answer
1 votes

Yes, the equation you gave is correct. Please note that the uppercase letters are usually reserved for frequency domain and/or DC values. For time-varying signals such as an inductor voltage, the ...

View answer
What is the capacitive reactance in this case?
1 votes

There are two main ways to approach this problem, namely (1) time domain and (2) frequency domain. You are thinking about the signal in the time domain, and you are trying to understand the capacitor ...

View answer
What is delay time of ADC/DAC?
1 votes

A DAC, short for digital-to-analog converter, is an element that converts a number (digital input) to an analog value (analog output). For example, a 10-bit DAC has 2^10 = 1024 different levels it can ...

View answer
Calculating current -- Thevenin?
Accepted answer
1 votes

Assuming all voltage sources are referenced to the same point, voltage at the star point is Vs*(1/R1 + 1/R2 + 1/R3) = V1/R1 + V2/R2 + V3/R3 Vs/Rp = V1/R1 + V2/R2 + V3/R3 This is Millman theorem. Once ...

View answer
Understanding Buck Converters and Solar Panels
1 votes

You need to understand that input and output power from buck converter are the same, minus converter losses. Say on input you have 10 V and 10 A, with 50% duty cycle you will get on the output 5 V and ...

View answer
Is it must to have freewheeling diodes for ULN200x when used with dc motor?
Accepted answer
1 votes

If the load has inductance, you must use freewheeling diode. Otherwise, you will probably damage the supply and/or MOSFET when breaking the current. You cannot change current of an inductor instantly. ...

View answer
Find fundamental period of a discrete-time signal
1 votes

Have a look at this post: https://math.stackexchange.com/q/164238 An excerpt from that post: If \$p\$ and \$q\$ are periods of \$f(x)\$ and \$g(x)\$ respectively, then any common multiple of \$p\$ ...

View answer
Errror:Undeclared _delay_ms while programming in MPLAB X IDE
1 votes

You have to define the clock frequency as follows: #define _XTAL_FREQ 8000000UL or as: #define FCY 8000000UL I use the latter definition. Try with both of these. One other thing - you need to set ...

View answer
How can I protect a sensitive Component from voltage spikes?
1 votes

You can consider using a TVS (transient-voltage-suppression) diodes. TVS diodes are placed from the point that you want to protect to ground. Basically, when the voltage is high enough, and you should ...

View answer
Find transfer function of Op Amp system
1 votes

Here is the solution in \$\mathcal{L}\$-domain: $$V^-(s)\left(\frac{1}{R_1+\frac{1}{sC}}+\frac{1}{R_2}\right) = V_{in}(s)\frac{1}{R_1+\frac{1}{sC}} + V_{out}(s)\frac{1}{R_2}$$ $$V^+(s)=V^-(s)=0$$ ...

View answer
Voltage vs frequency in RLC circuit
0 votes

I am going to split this answer into two parts: (1) how does the voltage and current depend on frequency, and (2) how can voltage on one component be higher than the source voltage. PART 1. The Ohm's ...

View answer
What may be the reasons for an FPGA to lose its configuration?
0 votes

This sounds like unstable power supply, but it could be something else, eg a glitch on the reset pin if the chip has one. FPGA devices usually do not have non-volatile memory for the bitstream. Note ...

View answer
Sending data from MCU to PC with 1.5 Mbaud using FT232R
0 votes

As some of you have already indicated, CoolTerm is not able to fetch data fast enough to empty the PC COM port buffer. I did a trick with priorities in the task manager, where I've set the Realtime ...

View answer
requirement of current drive for MOSFETs
0 votes

You can think of a gate driver as a power amplifier. Most probably, you will try to drive this MOSFET/BJT using PWM output of a microcontroller, which usually has around \$ 20~\text{mA} \$ output ...

View answer
Software timers and interrupts on a microcontroller
0 votes

After some Googling and discussion, I realized that I tried to achieve prioritized tasks, which is basically an RTOS (real-time operating system). Although an RTOS can be implemented on a ...

View answer
Total power from 2 different solar panels
Accepted answer
0 votes

As pjc50 mentioned, this is a similar situation to the partial shading problem - same voltage ratings, different current ratings. Consider two same PV panels connected in series. Each of them has a ...

View answer