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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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164 views

### High-side driver IC use of diode in the npn transistor BE

I would like to know why is used a diode between the BE of the npn in this circuit. The npn is used to boost the current to deliver to M2 gate in this bootstrap circuit. Is it maybe needed to get rid ...
393 views

### Parametric stabilizer circuit optimization for reducing ripple

We have a TV mainboard that will be used in cars. The input voltage will have lots of noise and not be regulated well. So we want to use a parametric stabilizer at the 12V input. Acumulator voltage ...
606 views

### thyristor equation

I know how does an I-V curve of a thyristor look like, but is there any thyristor equation that can represent the curve?
185 views

### Which type of amplifier has feedback? BJT, FET or both

The answer to this question is given in the picture shared but I am not able to understand the answer or rather I would prefer to say I do not agree to the answer given. So I need to know what will be ...
3k views

### How to calculate the dead time to incorporate in the complementay PWM input to an H-Bridge designed using MOSFETs?

I am working on making an autonomous robot. Right now, I am involved in designing an H-Bridge using discrete components for my robot. I am almost done with the H-Bridge design, and want to test it ...
2k views

### What is the rectifier's role in this AC dimmer circuit?

Here is a typical AC dimmer circuit: http://www.eleccircuit.com/wp-content/uploads/2010/09/light-ac-dimmer-120watt.jpg I just came across another variant which uses a rectifier: http://www....
148 views

### Is BJT amplifier a viable option if the design needs to be replicated without calibration?

||Sorry for messing this up the first time. This is my first post ever in a technical forum. Need to pick up the ways of the crowd. Thanks for all the feedback and help. Well appreciated|| I intend ...
2k views

### wiring AC switch with DC led

This is a follow up to a previous question I had answered. I'd like to show the following diagram. Here, I have laid out (crudely) a diagram that has 120v-110vAC from the wall going to a push button ...
358 views

### Inverting buck-boost converter

I'm not really sure why an inverting buck-boost might be disadvantageous compared to a non-inverting converter. If the load has a particular polarity, then can't you just connect it backwards to ...
346 views

### How can I prototype an Aluminum-clad board?

I have a fairly thermal-heavy design that I want to prototype on something resembling an aluminum-clad (or -core) board. Alas, it's not FR-4 and the low-volume run costs are exorbitant. What is a ...
171 views

### Unstable 96V DC to 3.3V Supply

So I've got a huge battery at 96VDC with a couple of electric motors hooked up to it that can draw huge amounts of current -- up to 600 amps. I need to power a few small electronics for a data ...
212 views

### Why does a battery starts working on rubbing?

Whenever my TV remote or wireless keyboard/mouse stops working,I take the batteries out and rub the two terminals with some rough cloth and it works fine.I've observed that this works a lot of times(...
75 views

### Why don't we worry about reverse recovery voltage and current of a diode in a simple circuit application?

When the diode goes into reverse recovery, why don't we worry about the power supply in that specific time since the current will be increased? Will it not damage the power supply or is it since it is ...
58 views

### Energy loss by Hysteresis

I recently did an experiment aiming to verify the magnetization curve of the cores of a single-phase electrical transformer. I applied a sine within one core and I observed this one and the other one ...
302 views

### Does Thyristor (SCR ) works for Inrush current protection?

Does a SCR ie Thyristor work for Inrush current protection in a circuit ?
122 views

### Lossless Resistor model in PSpice?

Is it possible to make a lossless resistor model in spice? I want to test the large signal model of my DCM SEPIC converter (without linearizing it). OrCad's PSpice library doesn't seem to have it, but ...
157 views

### Transformer rectifier set. A question about the schematic diagram

This is a high voltage transformer (53kV) and rectifier that is used to power an Electrostatic Precipitator. The schematic shows a jumper between terminals H1 and H2 with a label "Remove jumper for ...
742 views

1k views

### Junction to board thermal resistance

The Junction-to-case (bottom) thermal resistance of the TPS7A4701 LDO regulator is 1.7 °C/W. It is explained in the TI's app note "Semiconductor and IC package thermal metrics" that this metric refers ...
2k views

### freewheeling diode needed?

For a BLDC driver I`m using this Mosfet: http://www.farnell.com/datasheets/526719.pdf?_ga=1.38505579.956125949.1445440291 on page 6 there are some diode data. Is this diode enough for my application? ...
101 views

### Calculating Op Amp gain with voltage divider

Is there a gain differences between schematic 1 and 2? For schematic 1, the gain would be $$-\frac{R2}{R1} = -\frac{100k}{1m} = -0.1$$ But what about the schematic 2? Schematic 1: simulate this ...
2k views

### Driving a fan using a mosfet, do I need a diode?

I am using this BS170 MOSFET to drive a fan using a pwm signal generated by a 3.3V MCU according to the following schematics: (I know about the wrong symbol it's just for the packaging on the PCB) ...
2k views

### AC Motor flyback diode

Both AC and DC motor are inductors, and flyback diodes are used to dissipate residual current when power is disconnected from the motor. Flyback diodes are always present in DC motors, do you need a ...
376 views

### What is the name of this DC-DC converter topology?

I spotted a circuit in the wild that generates symmetric (e.g. ±8 V) analog power rails from a single +5 V supply using a single boost converter and a single 10 μH inductor. This is a very ...
2k views

### BTA16 absolute maximum amperage at 220/240V 50hz and impact of snubbers on resistive loads?

Using a BTA16 600CW3 triac with the arduino uno with the following schematic. Can it derive a 1.5 ton Air Conditioner and what is the absolute maximum amperage and power it can handle safely at 220/...
217 views

### What does 'g' in switching converter input voltage $V_g$ stand for?

I'm studying switching converters and the input voltage of a Buck, Boost, or whatever is designated as $V_g$. I've racked my brain (and also searched Google), but I can't work out what the 'g' could ...
366 views

### Low power chopper and power inverter

I'm seeking advice for components I could use in my lab course. My goal is that my students understand experimentally the ideas (circuit as simple as possible) behind a chopper device and a power ...
191 views

### Design considerations for a high voltage boost converter?

I'm trying to figure out the best method to get around 200V @ 15mA from a LiPo battery, and had a few questions. Should I be converting down to some voltage (eg. my microcontroller supply rail) with ...
826 views

### Better to regulate voltage by supplying or subtracting base current to BJT pass transistor?

As a learning exercise, I'm designing new guts for one of my venerable HP 721A (circa 1959) DC bench power supplies. With help from members of this site I was able to vastly improve the reference ...
653 views

### Question regarding a resistor in optocoupler/TRIAC circuit

I'm building a ac motor starter with a optocoupler (FOD4218) and a TRIAC (BTA16), one for each phase in a three phase 400V system. I have a question regarding the circuits that can be found all over ...
160 views

### First steps in building Switching power supplies

I want to make a 50Amps switching power supply, I have already done 10A linear ones succesfully This time it has to be a switching power supply one so, any ideas or tips of where to start are ...
848 views

### Galvanic Isolation with Voltage Equalization?

I need to equalize the ground voltage between the input and output of an isolated DC-DC power supply while still maintaining galvanic isolation. Is there a way to do this? The reason I need this is ...
3k views

### Why my full-wave bridge type diode rectifier circuit begins an analysis from 8. second on Matlab Simulink?

Hi, I am working on Matlab Simulink's work page to get full-wave and half-wave bridge-type-diode rectifiers as could be seen in the picture. But, according to my Scope2 screen when I double clicked ...
47 views

### Filter before or after switching regulator?

I will be passing a power line (12V-60Vdc depending on the circumstance) with a lot of noise, 300Hz and above, riding on it through a buck regulator. I want to remove this noise with a filter. I don't ...
71 views

### 1500-6000V linear regulator (noise eater)

Is there any known approaches to regulate HV in the range of 1500-6000V in order to eat noise? Low-side regulation is a possibility. The idea is to get ~100V higher voltage than needed, and then ...
54 views

### Quarter-wave impedance transformer working principle

consider the following scheme: A transmission line of length lambda/4 has been put before the load ZL in order to get an impedance matching. But, I do not understand how it works. Precisely, by the ...
195 views

### Help me identify power issues with this PCB

I bought the following UPS module for my Raspberry Pi: Power Pack Pro The module kinda works, when I unplug the power cable, the module instantly switches to battery powered mode without restarting ...
38 views

### 3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
81 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 ...
40 views

### Distribution-side voltage regulation and Low voltage ride through (LVTR) curve

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 ...
136 views

### How to deal with “peaks” voltages in mosfet in boost converter?

I'm designing a Boost Converter to go from 5 [V] to 12 [V]. The design I came with is the following: To understand better the design, please note the following: 1) To drive the mosfet I'm using a ...
2k views

### How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
77 views

### Driving a 12VDC solenoid from a 24VAC signal

I would like to put together a circuit that does the following function: 1) You input 24VAC. 2) It outputs 12VDC pulse to drive a 3W, 4Ω latched solenoid. 3) Once 24VAC is removed, it outputs a ...
474 views

### what does offline mean in flyback topology [closed]

What off-line means in flyback converter. is there any online also. if yes please describe
86 views

### High-Speed electronics - Reflections in T-intersection

I'm currently attending a course on "experimental problem solving" and we just started talking about TDR (time domain reflectometry). I do understand that reflections occur whenever there is a change ...
182 views

### Uncontrolled Bridge Rectifier

I am getting wrong answer for the above problem. My book says R should be 23ohms. Please guide me where I am doing the mistake.
2k views

### How sinewave pwm inverter filter output?

I know about inverters is as follows (correct me if I am wrong) DC source such as battery fed current into transformer by controlled switches such as mosfet or IGBT. This controlled current fed into ...
199 views

### Help with semi-controlled full wave monophasic rectifier using MOC3011 and SCR

I'm trying to build a full wave semi-controlled rectifier with this circuit: The zero's detection is working well and I am firing the TRIAC depending on the position of the potentiometer, the ...