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Questions tagged [power-electronics]

Refers to the conversion of electric power by using solid state components such as semiconductors. Can also generally apply to the field of electrical engineering which works with power electronics.

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63 views

Buck converter MOSFET getting hot

I am building a solar charge controller. I have based the design on pwm5 by Julian illet (circuit diagram attached). I am trying to convert this PWM charge controller in to a mppt one. The buck ...
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3answers
37 views

Inductance value of an Isolation Transformer

There is a small isolation transformer 'L1' of 1:1 ratio as shown in the image. A 0-24V, 75kHz square wave is applied from push-pull mosfets stage at the 'V_SW' input of the circuit. I want to find ...
1
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1answer
32 views

TO-247 High Voltage pin clearance

I am using IXYH16N170CV1 IGBT's mounted at the edge of a PCB. The legs will be long and bent back to reach the heatsink shown in the image. This device is rated for 1700 V and 16 A. My nominal ...
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0answers
34 views

What is the 'right' way for a 3-Phase Watt Meter to determine import-export Watt-hours?

What is the correct way for a 3 Phase Watt-Hour meter to measure total import/export watt-hours? I ask because I have seen this done in 2 different ways both in 'approved' meters: Assume that: Red ...
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0answers
45 views

Does potentiometer accuracy change with degree of movement?

I want to use a conductive plastic potentiometer for my actuator application where movement is +/- 40 degrees. As in datasheet, the potentiometer linearity is given as +/-0.2 % which I think is for ...
0
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1answer
57 views

220v to 5v AC to DC Rectifier IC [on hold]

I am working on a small project where I need to convert 220v AC to 5v DC with at least 100mA current. I am currently using Hi-Link's converter to achieve the goal and it's working great. I am looking ...
4
votes
1answer
344 views

Feedback in LM2574

I wonder what is the purpose of 'R66' at the feedback terminal of LM2574? I have seen its datasheet but I cannot find info about this. Instead of a single resistor there is a voltage divider shown in ...
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2answers
61 views

High voltage drop when load is connected [on hold]

I'm getting 6 volts open circuit voltage. Whenever I connect a load (resistors), there is a huge drop in voltage values. Does it signify power input is less or is there any other reason for the same? ...
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0answers
55 views

Circuit for Neutral point of 3-Phase mains

I wonder if the 'Neutral Point' as mentioned in the attached image is correctly labeled or not? Is there any mistake in this 3-phase circuit design? Edit 1: Also it looks like the 'Neutral point' is ...
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0answers
49 views

where can I commission the construction of a frequency electronic device? [closed]

I have to build a device to pur on the head that transmits multiple frequencies directly to the pineal gland at minimum 100W, it's a device that will be patented as medical equipment, anyone can tell ...
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0answers
43 views

Light dimmer circuit using triac gives fluctuating dimming

Light dimming using triac and optocoupler is very common and basic circuit, I have successfully tested the dimming for 1 channel (1 triac, 1 opto-coupler) now I want to add one more light dimmer with ...
1
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1answer
102 views

I want to command a 12V DC motor with the output of a clock alarm [on hold]

I want to command a 12 V DC motor with the output of a clock alarm. The output of the clock alarm is a 1V (pp) square signal of 100 Hz. I just want my motor supplied when alarm is on and then stop ...
0
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1answer
93 views

Capstone PCB for a Single phase power energy meter

I am an EE major in the process of working on my capstone project of developing a PCB of a Single phase power energy meter and I need help scrutinizing it. I Intend to interface this circuit with my ...
-1
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1answer
26 views

Boost converter control in DCM

I am trying to find a reference where a boost converter is controlled in discontinuous conduction mode (DCM) with constant duty cycle and by changing the frequency of operation. More specifically, I ...
0
votes
1answer
52 views

How to chose between 9V or 12V (or others) DC power supply [closed]

I see a lot of devices working either with a 9V DC input or a 12V DC input, usually provided through a DC jack connector. I was wondering about advantages and/or inconvenients of both voltages. ...
-3
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1answer
38 views

Would a power bank still charge if it's not receiving enough input voltage? [closed]

Say a power bank that denotes 5V, 2 amps should be required to charge it. Would a lower voltage and current say 3V and 1 amps will charge the power bank?
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1answer
33 views

Transformer fuse for primary coil. 240V with 16VA

So I know it may be a basic question but hear me out. These are the specs for the transformer I would like to buy. To add a fuse to the primary coil I would do 16VA/240V which gives 0.06A. Does that ...
1
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2answers
53 views

LED Matrix Leakage LEDs

I'm doing a LED matrix design and it's a cathode row design. Attached is a picture of my matrix design. The design works ok and I can show any pattern in the matrix. The problem is when a leak LED ...
1
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0answers
20 views

Which power converter topology has higher benefit of EMI/EMC?

Which power converter topology can be best suited for EMC compliance for small power converter to be used in LED lighting products. In my context I'm using a 5W non-isolated AC-DC converter which is ...
2
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1answer
63 views

[Last Update]Simulating an RLC circuit with the 1N3880 in ngpice did not show any results or graph

Im trying to do a transient response analysis with ngspice/gnucap and gspice UI of the next RLC circuit (corrected the source polarity), to find the damping effect in the system. That with the next ...
0
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2answers
93 views

Any Methord to overcome Main supply voltage fluctuations with ADC value readings?

Updated: I have a circuit for monitoring fan regulator speed change using ADC (as shown). But the problem is: In case input supply voltage (230V) varies due to some over-voltage or short circuit, ...
1
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1answer
48 views

Creating Neutral node on Three phase Inverter

I want to create a neutral node at the output of a 3-phase Inverter for ACIM. Is it possible to do that by adding 3 resistors at the Inverter outputs and join them together to get the neutral node? ...
0
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1answer
49 views

Current sensor that connected with fan regulator

Circuit diagram is shown Here input of FAN is connected to current sensor through a regulator My question is.. Is it ok to measure AC current through this sensing IC(ACS712) When fan speed changes ...
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1answer
124 views

Processor speed for generating PWM at 1 MHz

I want to generate square pulses at around 1 MHz to drive an H-bridge inverter. Now, I want to choose a suitable microcontroller, microprocessor, or a DSP board. I need to generate a few pulses (...
0
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1answer
44 views

Assemble Peltier Cooler to Li-poly Rc Battery

I have procured a thermoelectric cooler (TEC, this one) and my purpose of the TEC is to produce current for the Li-poly RC battery to increase its battery life. The Li-poly RC battery has 7.4V stated ...
0
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1answer
55 views

Two level Inverter [closed]

What thing determines a 2-level and 3-level Inverter as in the diagram? edit: Level is as in 'voltage level'. I have found following good link that explains it. http://www.elkraft.ntnu.no/~richardl/...
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0answers
31 views

SVPWM Primer for ACIM

As I am trying to implement a speed control for ACIM using SVPWM. I could not find out a focused primer on what exactly is a SVPWM technique and how is it implemented in an MCU like STM32F4? All the ...
0
votes
1answer
19 views

Peak Period Forecasting in electric grid

I am currently working on the day ahead load forecasting using a regression model over a microgrid level. I wanted to know is there a way I can detect peak period i.e period where demand is high from ...
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0answers
41 views

FOC Control vs SVPWM

I wonder how far the similarities go between FOC control and SVPWM modulation and from which point on wards they are different from each other? edit: Can anyone point out a very basic primer from ...
1
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1answer
45 views

Heating issues with solar charging circuit

I am using the above circuit to charge a 7.4V Li-ion Battery.With input MPPT voltage set at 12V, I have applied 13V input voltage to the circuit. The battery is charging at 1.4A. (according to the ...
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0answers
24 views

Static VAr Compensation

I have to design a 3 phase Reactive Power Compensation System with using only reactors, no capacitor is needed. Total capacity is 505kVAr, but 475kVAr will be done with contactors, rest (30kVAr) will ...
0
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1answer
32 views

Replace potentiometer for Kemo M012 Power Control

The potentiometer of my (Kemo M012 Power Control) is mechanically broken and I would like to replace it. However, I am unsure whether the replacement needs to meet any specific characteristics or if ...
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0answers
128 views

1. order system Gain

I have been assigned a task and I am having trouble finding the gain K. Here is the task: To the time t = 0, there is put a step at 3. Find the gain. Find the time constant. Find the time delay. ...
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0answers
21 views

Temperature-dependent leakage current in IGBTs

On one hand, the leakage current of power electronics modules such as IGBTs depends on the temperature. On the other hand, the temperature distribution on the IGBT chips is significantly non-uniform ...
3
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4answers
85 views

Phasor vs Vector vs Space Vector

I wonder what is the difference between a Phasor, a Vector and a Space Vector? A phasor is also a rotating vector in space then it means that a space vector is same as a phasor? Also by definition a ...
0
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1answer
42 views

SPWM vs SVPWM implementation [duplicate]

I am learning various control techniques for 3-Phase ACIMs. So far I have understood about the SPWM implementation.. in which we save Sin values in a LUT and then modulate the duty-cycle of PWM wave ...
0
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1answer
53 views

Two PWM signals from TL494

I need to generate two open-loop PWM signals with different duty cycles for my converter. The frequency is 20kHz. I did generate one signal. Should I use another TL494 and connect it to the same ...
0
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2answers
74 views

SPWM vs 6-step PWM vs SVMPWM

While learning 3-Phase scalar control of ACIM using STM32F407 MCU I could not clearly understand the diffrence between the following terms: 1. SPWM 2. 6-step PWM 3. SVMPWM How do they differ from ...
0
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1answer
32 views

Load Profile plot from Smart meter data

In electrical engineering, a load profile is a graph of the variation in the electrical load versus time. I am currently working on Smart meter data having reading an interval of 30 min i.e power ...
0
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1answer
52 views

Sending bits on a coaxial cable

When you are sending bits or voltage's through a coaxial cable from 1 PC to another PC, does current flow from PC1 to PC2 through the cable? If so, mustn't there be a complete circuit?
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0answers
18 views

Low voltage ride through (LVTR)

Nowadays, I see that photovoltaic systems have Low-voltage-ride-through capabilities. So in case of a fault, when the voltage is decreased, they remain connected to the grid and provide reactive power ...
0
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3answers
105 views

How to convert 5v to 1.5v?

I am a newbie. I have a power bank which gives 5 v output from a USB. Now I need to step down the 5v into 1.5v to run a small motor. I have searched a lot to find any readymade IC... But unable to ...
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0answers
29 views

Allowable ripple current οf battery charger

The ripple of the charging current is pretty important for the aging of an electric battery. So, the current ripple should be as less as possible. In order to reduce the current ripple, we have to use ...
1
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1answer
45 views

Sources and References for Motor Selection [closed]

So, I was wondering if there is a book/textbook which discusses the issue of selecting the proper motor for a job. The type of it (induction, synchronous, DC, etc.) and mainly the nominal power of it. ...
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1answer
57 views

Instrumentation amplifier and sensors [closed]

Why does we use instrumentation amplifier to measure temperature rather than using any sensor?
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1answer
21 views

Phase or Line V/F Control for ACIM

I am trying to implement V/F control for 3 phase ACIM using STM32F407 MCU. I am using 6 Complementary outputs of its Adv. Timer 1, Center aligned 256-points PWM waveform. The DC Bus voltage is 600 VDC....
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0answers
25 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
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0answers
41 views

SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation

I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor. Since one can choose which zero vectors (000 or 111)...
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0answers
38 views

How to see sinusoidal wave from SPWM output?

I am generating SPWM waveforms using complementary outputs of advance timer. I wonder how can i see the actual sinusoidal waveform on an oscilloscope which is intended from the SPWM output? My MCU is ...
-1
votes
0answers
23 views

Zener Diode with series pass transistor for overvoltage protetion

I want to use the following circuit for the over voltage protection of my device having load current of 3A (max). The input Voltage is 24-30V (unregulated). Output voltage is needed is 12V (12.5V max)....