Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [step-up]

173 questions
15
votes
3 answers

LM2586 - Inductor Heats Then Burns

I'm designing a step-up constant current source to drive LED strips (nominal load voltage is about 54 VDC). Requirements: Vin: 18..32 VDC Iout = 0.2 A Vout = 54 VDC (nominal) - 57 VDC (maximum) Since the circuit should have an on-off input, I…
Rohat Kılıç
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7
votes
1 answer

How can I rectify up to 85 kV?

I've recently gotten into eletrochemistry, and I found out that if you break through \$\epsilon_{0}\$ with a high enough voltage you can ionize various gasses. I've already wound a 1:1250 EE core that I plan to operate at 350 kHz on a 25 V supply…
user14828
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5
votes
1 answer

Simple, compact 9V DC to 400V DC step up

I'm attempting to create my own Geiger-Muller counter based on an old, soviet STS-5 tube. I want it to be as compact as possible. I don't want to use ready-made modules, like this one, instead I want to put everything on one PCB. My only struggle…
sp9dev
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5
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10 answers

Best approach to step down 220VAC to 160VAC?

Hey Electrical Engineers, I'm a newbie to electrical engineering (I am a software developer by trade and am starting to work with Raspberry Pis and want to learn about basic circuit design). My first project involves converting an LED traffic light…
andrewniesen
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4
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7 answers

How is current dropped through a step-up transformer, when current is dependent on resistance?

Suppose you have a 1:10 transformer. You put in 12V and you get 120V out the other end. Now the current before the transformer would be $$V=IR$$ $$I = \frac{V}{R}$$ $$I = \frac{12}{1}$$ $$I=12$$ (assuming a sample resistance of 1 ohm), while on the…
stickynotememo
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4
votes
0 answers

Can this Raspberry Pi UPS circuit work?

I created following UPS circuit to shutdown my Raspberry Pi 3A+ properly: I would really appreciate if somebody can review my circuit. I know it's a little bit hard to read, but I'm sorry. I'm a beginner in creating circuits. The UPS is powered by…
Manuel Neff
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3
votes
3 answers

MC34063 step-up unstable operation

I am building a 3.3V -> 15V/100mA boost converter using MC34063. I have used formulas in the datasheet to calculate values of components. Then I spotted some oscillations in Vout and instability of inductor current. Is this normal behaviour of…
Vasiliy
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3
votes
1 answer

Boost converter not working with any inductor

So I have been trying to design and build a boost converter which steps 5 V up to 12 V. More specifically, the output is to drive a fan which runs on 12 V, 70 mA (nominally). As could also be seen in the image, the converter has an n-channel MOSFET,…
user319817
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3
votes
2 answers

3.7V to 5V step up not providing enough current

I'm trying to power up a circuit that consists of an Arduino Nano, 3x 3W stereo audio amplifiers (PAM8403), an audio player module and 20x RGB LEDs. The power source is a lithium battery 3.7V 500mAh. The circuit works perfectly from any USB power…
Chu
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2
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2 answers

Step Up Circuit does not work

I am using an IC as a step-Up converter in my PCB. It is supposedly to increase voltage from 12V to 30V. This is the chip that i used. https://datasheet.lcsc.com/lcsc/1809251831_Diodes-Incorporated-AZ34063UMTR-G1_C99659.pdf The effects that i notice…
user1584421
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2
votes
4 answers

Boost Voltage of Signal Generator Output (via Audio/Signal Transformer?)

Goal: Have a frequency variable voltage of at least 200 V (more would be great), between 50 Hz and 8 kHz (sine wave, as pure as possible). The voltage is used as open circuit voltage (only drives a couple of pF capacitive load). My Solution: I use a…
Maxim
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2
votes
1 answer

Choosing a transformer for 120V->240V AC step-up for low current (<1 W)?

I've got a device (microcontroller-based energy monitor, https://shelly.cloud/knowledge-base/devices/shelly-em/) which I'm using to measure energy consumption of 240V split-phase devices (motors). Since the device is powered from one of the phases,…
Kevin P. Fleming
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2
votes
1 answer

How should I understand this 1.5 V to 90 V voltage step-up network?

I am learning about Jim Williams's avalanche pulse generator. It is in page 93 of AN47 - High Speed Amplifier Techniques. I don't understand the circuit's voltage step up network, which is 1.5 V to 90 V. It looks like C2 and D2 form a Villard…
haiwuxing
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2
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1 answer

TPS61046 wrong output voltage and high current consumption

I am designing a circuit to control a multiplexed led matrix and for that I am testing two boost circuits. The TPS61046 and the TPS61080. My idea is that the input voltage is via USB or a Li+ coin cell (probably Li-ion@3.7V). The attached schematic…
Smart_Celery
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2
votes
4 answers

Is it possible to step up dc without changing it to ac or pulsed dc?

I've been looking at dc to dc step up converters/voltage multipliers, and they all seem to make it ac or pulsed dc and reconvert it to dc at the end. Is there a way to step it up directly? A clock circuit is pulsing dc, for whoever got my question…
Charlie
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