Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [dc-ac]

72 questions
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4 answers

Full bridge HVDC to modfied square sine - random half side MOSFET burn

I am trying to make a step-down 350V to 220V voltage converter. I decided to go with rather simple circuit of full bridge MOSFET inverter since my loads are only resistive or switched. I had built it and tested today, however, without any success.…
user92809
5
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3 answers

Understanding the oscillation action inside this 12V DC-to-AC CKT

A friend brought this circuit to me and asked me to explain the working. I decoded the following schematic from the PCB. simulate this circuit – Schematic created using CircuitLab In the primary coil of the transformer I measured about 19KHz…
vyi
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What is the purpose of using more than one MOSFET for switching in a switch-mode power supply?

As shown in the model, two MOSFETs are employed for converting DC to AC to be fed into the transformer. Why would we need a second one when a single MOSFET could handle the entire voltage?
SageMac
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Calculating W DC to W AC inverter efficiency

I have a DC to AC power inverter with the following information on the specs sticker: Input: 12 VDC, 50 A max AC Output: 115 VAC, 60 Hz, 400 W max (5 min) / 320 W continuous Given that current in amps is equal to the division of power in watts by…
u20210512
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Single Phase Full Bridge Inverter - I Can't figure out which PWM Control Technique is used

I have the following Single Phase Full Bridge Inverter and a PWM control method which in my language is called "asymmetric mode". I understand how it works but I can't find any documentation written in English language about exactly this technique.…
NumLock
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3 answers

I need help designing a low voltage DC to AC circuit

Can anyone help me design a circuit that will perform low voltage DC to AC conversion? Ideally, I would like to have 3 to 6 VDC input (using AA batteries) Approximately 1 VAC output (less would be fine.) Output frequency must be in the range of…
Paul
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How do I Drive High Side MOSFET in High Voltage Low Power DC-AC Unipolar Converter?

I'm working on a simple dual stage piezoelectric driver consisting of a DC-DC flyback converter (programmable from 50V to 250V) and a DC-AC half-bridge unipolar inverter. The flyback converter is working great!..But I'm having trouble with the…
FrankTheTank360
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DC to AC Inverter for WPT

I'm working on a batteryless mouse, and it will be wirelessly powered by the USB (5V 0.5A), however, I already stepped up the voltage to 12VDC. From what I understand, I will need a DC to AC inverter circuit to convert the 12VDC to AC for Wireless…
user142706
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2 answers

How much current draw from an inverter?

If I have a 12 V car battery and I connect it to a 3 kW 10 A 220 V AC inverter, how much would be the current draw? 250 A?
Simon Sultana
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Attempting to build photosensitive alarm-clock - circuit questions

I'm working on building a photosensitive alarm clock for a school project. My supplies require me to use a DC power source, and my speaker requires an AC current. In the circuit I posted below, I attempted to do this in a two step process, where I…
Zinggy
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Converting 0.6V 20A DC to AC (frequency ~ 240 Hz)

I will be driving ~1600 linear resonant actuators (LRA) in parallel (each requiring 0.6V @ 19 mA AC). As the buck regulator, I will be using TPS546C23 synchronous buck converter from TI to convert 5V 4A DC supply from battery bank to 0.6V 20A DC. To…
Swapnil Saha
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I want to build a battery based DC supply for LED mirror that has AC power cable (230VAC)

I recently purchased an LED mirror that is AC powered (230VAC). The problem is there is no GPO (power outlet) in the room. I am trying to make this wireless and wall mounted. I tried researching DC to AC inverters, however they appear to be very…
Lauren
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Why the intersection points in SPWM define the width of the pulse?

After my previous question Why the triangle reference wave is used in PWM for sine modulation I still have some troubles on one particular point of natural sampled PWMs or more precisly SPWM. My question is: Why the intersection points between the…
Jhonathan Asimov
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How to run a 8-12V AC old-school doorbell with a 12V DC source?

I found a fat AC doorbell lying in my garage taking dust, and I want to use it as an additional acoustic signal for my DIY home alarm. As per printed specs on its downside it accepts 8-12V AC, and sure enough inside there's the very simple solenoid…
ephestione
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Size and weight of DC-DC vs DC-AC at equivalent powers

I am looking at designing two power systems for a project and was wondering, at equivalent power, let's say 10kW, what is the system that is easier to design, can be smaller in volume and lighter in weight: a DC-DC converter (63V - 37.5V to fixed…
elt93
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