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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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45 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 ...
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2answers
107 views

boost converter for ultra low power application

I want to design a dc-dc boost converter and manage power (MPPT) for an ultra-low power fuel which contains input voltage < 1 V and input current < 500 uA. if I choose simple boost converter, I ...
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1answer
102 views

Induction generator

I have an induction generator on the same shaft with induction motor. Both machines are same (have same nameplate: \$ U=400\,V\$, \$f=50\,Hz\$, \$n=1435\, rpm\$, \$P=9.3\,kW \$, \$ \cos(\phi) = 0.90 \$...
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2answers
66 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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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 ...
3
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1answer
164 views

AC MOSFET switching without any diodes? [Low-Cost AC Solid-State Relay With MOSFETs]

Is it possible to switch an AC load using two MOSFETs in anti-series such as the picture below? In this mode, each MOSFET is on during one half of the wave and the other's body diode conducts to ...
1
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1answer
108 views

How to design for electrical connection for a food dryer

I am on this project in building food dryer to dry 2 kg fish cracker maximum per use. Based on the calculation, I only need to use power of approximately 60 watt for the heating to achieve the energy ...
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7answers
74k views

Why does the USA use 110V and UK use 230-240V?

Why does the USA use 110V and UK use 230-240V? What are the advantages? Explain me with calculation. Why do they use different frequencies like 50Hz, 60Hz? What is the reason?
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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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3answers
188 views

How to determine forward voltage for overdriven LEDs

I'm trying to figure out how to determine the forward voltage and forward current for overdriven LEDs, and need a bit of help understanding what are the dependent variables and which are independent ...
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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 ...
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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 ...
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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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1answer
2k views

Line Commutated Inverter

This is the circuit diagram for a Line Commutated Inverter which I came across in my power electronics book. The input and output voltage waveforms are give below: My logic says that from π to 2π,...
3
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1answer
122 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
4
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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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3answers
1k views

what the best way to calculate Rg gate driver for Mosfet

I need to drive a MOSFET IPW90R120C3 from Infineon here the Specification of MOSFET VDS @ TJ=25°C 900 V Rdson @ TJ=25°C : 0.12ohm Qg = 270nC Specification of ...
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6answers
16k views

How to throttle power consumption of a heating coil?

Which is an appropriate but simple electrical circuit to reduce the energy (power) consumed by a heating coil which has an AC feeding without generating an asymmetric load (large DC component, e.g. ...
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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 ...
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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 ...
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 ...
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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 ...
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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 ...
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3answers
1k views

Is it safe to use series polarized capacitors to form non-polarized capacitors to be used for higher rated voltage?

simulate this circuit – Schematic created using CircuitLab It is known that we can use series capacitors to increase rated voltage. But I want to know how far we can push this feature to? ...
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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 (...
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0answers
129 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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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. ...
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 ...
0
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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 ...
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2answers
145 views

How to calculate the phase difference between current and voltage?

Using the next circuit and the components of simulate this circuit – Schematic created using CircuitLab \$R=20\Omega\$ \$L=25mH\$ \$V_{DC}=36\$ \$v_{s}(t)=50+\underset{n=1}{\overset{\infty}{\...
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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, ...
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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 ...
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1answer
449 views

Can we use 125VAC 20A switch in place of 12VDC 20A switch?

Can we use 125VAC 20A switch in place of 12VDC 20A switch? I have searched my local market and found 125VAC 20A switch. Can i use this AC switch in place of 12V 20A switch as it is not available in ...
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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 ...
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
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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3answers
136 views
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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
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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 ...
3
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1answer
171 views

Attaching temperature sensors to solar cells

For my project, I have to find the temperature coefficients of the solar module that I am using. Meaning that I need to calculate the change in voltage, current and power with respect to temperature ...
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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 ...
2
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1answer
140 views

How to connect four different ground planes in the same PCB?

I am working on a project which uses the LTC4020 multi-chemistry battery charger from Linear Technology. The design includes a microcontroller ( NXP KL25Z) to provide additional outputs and ...
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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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1answer
123 views

Transformer Design Using AP Method and Construction

I am designing a transformer for a traction inverter using the AP method. 1) I have chosen a Metglas core with a saturation flux of 1.56 Tesla. I have chosen a operating flux density of 0.6 Tesla. ...
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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 ...
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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
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 ...