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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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60 views

Is there a circuit that will take power from two sources and would use the second only if the first is down?

I'm looking for a specific circuit that would be connected to 2 power supplies. However, unless the first one fails e.g. power outage, the second one will not be used. I'm not familiar with the name ...
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3answers
432 views

Resistor values for a Voltage- Controlled Current Source Circuit

simulate this circuit – Schematic created using CircuitLab Hi Folks, During my bachelor thesis, I am learning IGBT gate driver cricuits. I am struggling with understanding the following ...
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28 views

Common rectifier (or source) to power testing equipments

I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
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1answer
41 views

Powering two 5v 1amp devices from one battery

I'm looking to power a rPi Zero W and a tomoko 87 mechanical keyboard both of which take 5v power (I know the rPi needs 1amp, not sure about the tomoko 87 as the description simply says "5v DC"). I'm ...
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1answer
365 views

Solid state circuit breakers

I'm trying to design a Solid state circuit breaker for a 3phase AC system with a rating of 690V, 1000A. As, the stray inductance contributes to the voltage peaks in the system I'm trying to protect ...
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1answer
272 views

Why are polarized capacitors are treated as non polarized in Clamping circuits?

This semester we studied clamping circuits, but there's rather strange happened when the professor was explaining the working of the circuit, he treated polarized caps as if they were non-polarized. I ...
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28 views

How can I find a similar circuit design like the one in Chargetech or Omnicharge( DC to AC 85 Watt )?

I would like to build one 85 Watt DC to AC Inverter for my personal use. After seeing the designs of Omnicharge and Chargetech I wonder whether the Circuit and component descriptions are available to ...
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1answer
54 views

Turning a transformer into an inductor

If i wind a primary on an inductor can it be used as a step up transformer(assuming the number of turns in the primary are lesser than the secondary).
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359 views

Negative Input DC-DC power supply

I have a requirement of DC DC power supply where the input voltage is -48VDC and output voltage : +5V and -5V with output current 4A and 3A. Is it correct to use a DC DC power supply of more than 35W ...
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313 views

Multiple pusle width modulation

I'm really struck in solving the following question The single-phase full-bridge voltage source inverter (VSI), shown in figure, has an output frequency of 50 Hz. It uses unipolar pulse width ...
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59 views

Heating up of a custom board

I've designed a custom board. and I have a problem with the supply part: the board should be supply using a lipo battery **B100 header **, this should charged using an USB cable. the board works ...
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66 views

To what extent are semiconductors used in high voltage and power grid electronics?

I'm thinking of silicon controlled rectifiers and HV thyristors. Why have vacuum tubes been phased out or have they? I believe that in some countries, power grid electronics is entirely tube-based ...
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95 views

Can you run a capacitor voltage doubler backwards to center an output between two voltages?

If a charge pump is run backwards, will it transmit power to the load at a voltage roughly centered between the high and low inputs? Will it self-balance? The intent of this circuit is to reduce the ...
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68 views

Anyone familiar with this power solution?

I'm studying a server schematics and found something interesting. It uses a power solution, to transform 48V to CPU core power (~1V) http://www.vicorpower.com/zh-tw/industries-computing/48v-direct-to-...
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2k views

dc motor positive (RED) and negative (BLACK) terminology/notation

Is there a standard wiring notation of a permanent magnet dc motor terminology ? in other-words if 12v is applied to the red terminal and ground to the black terminal does this cause rotation in CW ...
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886 views

3 phase fully controlled rectifier

A 3 phase fully controlled bridge converter is fed through star-delta transformer. The converter is operated at a firing angle of 30 degrees. Assuming the load to be a RL load and load current to be ...
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234 views

How can a DC-DC converter kill SLA battery voltage on light load?

I'm running a small 12V-500V DC-DC converter (shown) on a purely resistive 50mA load. I was getting weird behavior off my bench 12V DC supply so I plugged in the SLA battery shown. I connected a ...
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1k views

electric wheelchair

I'm making an electric wheelchair . I want to lift a total weight of 100kg on it with a max speed of 4mph. So help me choose appropriate motors(dc geared , stepper, or .....) and batteries (12 or 24 V)...
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1answer
235 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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1answer
285 views

Soft starter design Using Back to Back SCRs three phase induction motor

I am seeking a help to design the firing angle technic of my Squirrel Cage Induction Motor Soft Starter of Back to Back SCRs. How to calculate the appropriate firing angle? and what are the wave forms ...
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2answers
88 views

How can i record the rpm of a small spinning object with out the use of a hand held tool such as a laser.

How do I measure the revolutions of a moving object as it rotates around. Imagine a fan blade, I need to measure the rpm of the fan without using an outside tool such as a laser rpm reader. Ideally ...
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1answer
1k views

v-i characteristics of reverse conducting thyristor

May I know how does a reverse conducting thyristor work and its v-i characteristic? I have been searching all over the internet and libraries but the information about RCT is very limited. To my ...
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1answer
33 views

Reducing noise in AC clamp meter

I am currently using one of these AC clamp meters to read an 25Hz square wave signal along a wire attached to a wall. Unfortunately, there seems to be a lot of noise of other frequencies around this ...
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1answer
52 views

What happens to the low cut off frequency when replaced with a larger bypass capacitor?

When the emitter capacitance is increased to 100 microfarads. What would happen to the low frequency cut off of this amplifier?
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1answer
154 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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1answer
59 views

Inductor power choke

I'm looking for this inductor 10 µH. Need help to recognize series model of this IC's inductor.
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1answer
702 views

WS2811 RGB LED with arduino

I need to get this model of RGB working with Arduino , I can't find this model on the internet , it's says 12volts. I need to know how to hook it up ? and if there is an Arduino code that would be ...
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1answer
246 views

Maximum power transfer and Thevenin

I am trying to find the thevenin resistance value and the Vth for maximum power transfer. I have tried to find Rth by calculating R3 and R2 as parallel resistance and same for R4 and R5 and then ...
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1answer
121 views

Buck-Boost converter without low side switch

Please look at the buck -boost converter below. It is 2 outputs, one buck and one boost output. Would the circuit work as describe in the picture? In what condition the circuit will it work? If so how ...
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1answer
96 views

Can this circuit work without being grounded?

Have a look on this Seeedstudio IR Flame sensor module. The PCB image suggests that the components are not connected to the ground. Then how could the Sensor Module work ? Is the PCB circuit ...