Questions tagged [converter]

A circuit that converts a signal from one form to another. Analog to digital, Digital to analog, Voltage to current, Current to voltage etc. The key to understanding is the transformational properties of the circuit as opposed to just amplification or buffering.

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250 views

Is this inductor and caps a good choice for a buck converter?

I wanted to get together a simple and efficient 12V to 5V switching power regulator using only through-hole components that can be soldered to a nice protoboard. For my purposes, I need to provide 0....
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1answer
72 views

pH Sensor with current loop

I have a ph sensor(S272CD) that give the output from -2000mV to +2000mV. I need to interface it into a current loop converter(XTR117). The current loop ic will accept only 0 to 5v. How can i connect ...
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3answers
270 views

Question about Non-isolated Buck Converter [closed]

I have a tutorial problem about buck converter with MOSFET, anyone can help? During the test of the non-isolated buck converter (see the circuit below), when we measure the gate signal, there is an ...
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1answer
285 views

How is SC16IS740 programmed?

I'm interested in using the SC16IS740 UART-SPI converter to interface with W5500 Ethernet controller which has SPI inputs. Because the datasheet is unclear to me, I'm asking if anybody knows how is ...
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2answers
93 views

Connecting a medium sized 1 kVA Inverter with a 2 kVA Generator

I have a 1 kVA inverter which is using a 12 V battery to generate 220 V AC (battery is connected to a charge controller and is being charged by a PV). In addition I've got a 2 kVA generator. ...
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1answer
119 views

2mA Current Limiter from a dc to dc converter

I have a 12V power supply connected in a 12V to 5V dc to dc converter. The problem is, the current at the 5V side is 5A which my optocouplers cannot handle in fact, the only current i need is 2mA.The ...
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2answers
222 views

This circuit uses a transformer on a rectified DC voltage, what purpose does this serve?

I am trying to design a USB charger from scratch, and I have come across this schematic in the data sheet of a AC-DC converter that I would like to use (NCP1011): Unfortunately the circuit does not ...
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1answer
1k views

Is it possible to convert 12V dc to 220V AC?

One of my friend said it's possible to convert a 12V dc to 220V, I cann't belive that it's possible because IF that's possible we don't have to have too many power plants for our power needs. There ...
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2answers
520 views

2 dc-dc boost converters to create dual power supply

I'm doing a project with a Silicon Photo-multiplayer where the breakdown voltage when negatively biased is -25V. I was wondering is there anyway to connect two DC to DC boost converters to give me a ...
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0answers
320 views

very high current buck converter

Need to convert 40 volts to a 24 volt 2000 amp 1 second duration pulse. long duty cycle. Current must be settable from 500 to 2000 amps and time from 0.1 to 1.0 seconds. Ideas please.
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3answers
604 views

Mathematics of Cap Charging Circuit

To teach myself the basics of power electronics I've been trying to build a circuit, which charges up a capacitor to a voltage higher than the input voltage. Basically it's a boost converter with no ...
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1answer
326 views

What resistor values should I use with this boost DC-DC converter IC?

I'm trying to use a STOD1317BTPUR DC-DC Boost converter to drive a 12v OLED Display from a 1-cell lipo (~ 3v - 4.5v). The thing is that in the application circuit provided in the datasheet the values ...
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1answer
711 views

How do PWM AC/DC converters work

My question's subject is the SMPS(PWM) AC/DC converter design used for chargers. There may be more ways to make what I'm speaking about, so I'll try to narrow the list down. The circuit works using ...
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1answer
167 views

Noise Shaping of \$ \Sigma \Delta \$ Converters

I am currently reading the book Continuous-Time Sigma-Delta A/D Conversion to get myself a better understanding of \$ \Sigma \Delta\$ converters. Unfortunately I got stuck at the point where noise-...
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1answer
196 views

Cycloconverter , MOC3021 problems?

i am doing a cycloconverter single phase design and i have a problem , i use microcontroller to control the firing angle ,i have used zero crossing voltage (741) to trigger INTERRUPT port of MCU , i ...
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5answers
670 views

Voltage level translation between +3V and +3.3V

In a project of mine I have two ICs that work at different voltages. IC_A at 3V and IC_B at 3.3V and they talk to each other through UART. In my prototype I use a mosfet with two resistors for each ...
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1answer
4k views

Polarity symbols on universal AC-DC adaptor

I have a universal AC-DC adaptor that has the following symbol by the polarity switch: Is it safe to assume that the top part of the diagram indicates the polarity of the inner surface of the ...
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0answers
447 views

Flyback Converter Design Help

I am unsure whether I should edit on my previous question or create a new one. Please give me your feedback on the proper way of doing it here.Back to the question, I have struggled for the past few ...
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1answer
747 views

LTSpice Simulation Problem - Controlled Rectifier Single Phase Dual Converter

So I am having problems simulating a Single Phase AC/DC Dual Converter on LTSpice. At the first converter I am getting the perfect output but when I take the voltage probe from the second converter ...
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2answers
1k views

USB to TTL converter: why doesn't TX need a voltage selector?

I plan to flash new firmware for a Sonoff ESP8266-based switch. So I need a 3.3v USB to TTL for the programming. I see an inexpensive converter from China which has pinouts for 3.3v TX RX GND 5v ...
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1answer
875 views

How to turn off DC-DC step-up converter to run on 3 AA batteries

simulate this circuit – Schematic created using CircuitLab I am using this step-up converter : DC-DC step-up converter with 3xAA batteries (input voltage for the circuit is ranging from 4.65v ...
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2answers
2k views

CAN to SPI converter

I am looking for a chip which will convert CAN messages to an SPI message. Is there any chip available as such? Until now I have found MCP2515. But this chip does not serve the purpose, because SPI ...
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2answers
163 views

PWM controlled Input Voltage/Current regulated Converter (for solar panel)

(newbie question) Briefly: In a converter (let's say DC-DC), I want to dictate a voltage to the output of solar panel, on the fly. As I look around online, for example in some IEEE papers, Buck or ...
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2answers
1k views

Run a 120V/60Hz motor at 230V/50Hz

I need a step up converter for a 5.1A, 120V vibration motor I have in the US that I need to use in Ireland. The motor runs at a fixed frequency of 30Hz in the US. If I step up to 230V for Ireland will ...
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1answer
1k views

Upgrading automotive heater blower motor resistors with a PWM based device

My 2004 car has a resistor module attached to the DC heater motor circuit that has three coiled resistance wires (2.1 Ohms, 1.5 Ohms and 1 Ohm), two which have burnt out as only two out of four speed ...
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4answers
3k views

110 AC to 12 DC with high Watt

I'm looking into purchasing a winch that is powered by 12V DC. It's a 1 horse power winch, so I assume it requires just over 700 Watt to function at max load. Right? I want to use it at home, so I ...
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1answer
88 views

DC/AC Converter using Motors

I have two motors: One from a DVD player and Stepper motor. I was wondering, if I use the DVD player motor to spin the stepper motor will I get an alternating current?
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3answers
715 views

Convert low power Alarm Clock from 120V 60Hz to 230V 50Hz

I recently bought a vintage flip-digit radio alarm clock from ebay, because I plan to refurbish it and basically use it for the rest of my life. However I only realized that the device must be ...
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1answer
1k views

24V to 5V converter using a LM3489

I'm currently trying to create a converter 20V-26V to 5V with an 2.1A output. So I use the LM2489 chip (datasheet: here). My circuit is the following: I make this circuit but with I power up ...
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1answer
300 views

Use car speaker output as input to IC?

I have a circuit that is to be used together with a car stereo. The circuit detects DTMF tones (touch tones) using the Holtek HT9170B. I need to feed the HT9170B with the high level speaker output ...
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2answers
2k views

Input Capacitor Selection for Boost Converter

I'm learning about boost converters right now and have started designing one. However, I can't find the equation to calculate the input capacitor. The readings just mention that the value is listed on ...
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2answers
589 views

Switching loss in a synchronous converter (buck, boost or buck-boost) when light load occurs

When a synchronous converter operates in high load condition,if the inductor current is always positive, the switching loss of the Synchronous mosfet is minor in comparison to the switching loss of ...
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6answers
4k views

Buck Converter Switching Frequency

I am currently designing a buck converter that takes in 100 V and outputs 50 V. I want to drive a 25 Ohms load resistance so the current is 2 A. It is in CCM mode and has 1% ripple on output and ...
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5answers
7k views

DC-DC Boost converter in Parallel

I'm trying to power a 12V 1A device with 1 cell lipo battery. At 12W, the lipo would need to provide 3.24A (assuming no power loss) to step up the voltage to 12V and providing 1A. However the DC-DC ...
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4answers
363 views

Can anyone explain what is doing this diode-capacitor branch on a Boost converter?

I've analized the circuit through capacitor currents to find the transfer function, but I keep getting to the exact same transfer function of the typical Boost converter, is the Diode-Capacitor branch ...
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1answer
146 views

24VAC to 12VDC momentary switch short

I'd like to hook up a wireless bell to my garage door control board (bell should ring when door is opening). The garage door control board does expose several contacts dedicated to lighting ...
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1answer
171 views

74141 BCD-to-decimal converter not working?

I set port D are output and have hex value 0xca at BCD format. But LED is all HIGH. I wonder why this converter not do its function??
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2answers
271 views

500F supercap charging causes circuit undervoltage (pre-charge)?

I have a 24V Generator starter system. Which controls all the engine parameters and includes a starter and it's supercap of 500F. I'm supplying it with two redundant 24V 1kW sources. First DC/DC ...
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2answers
937 views

How to work out how much pulling power an electric motor has in kg?

Say I have 5 kg mass on a spindle that has a diameter 5 cm and I want to move it up at 6 cm/s (just example numbers). How would I find out the specs needed for what electric motor I would need? I ...
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1answer
423 views

3.7 to 5V Boost Converter Design Issue

I am an electronics hobbyist who has started dabbling in making circuit boards for my projects. I have designed and fabricated a board for a solar powered sign I am making. The sign essentially ...
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1answer
72 views

Will Appliance with Power Supply AC 100 -240 V 50/60Hz work in US? [closed]

I've got a new Japanese game system; I've had some in the past and used a step down converter to safely use them. That was a long time ago. The power supply for the new one I have reads: ...
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3answers
247 views

What will cause if I put a larger inductor to a step down converter like MP1584 or MP2307?

For example my calculation for MP1584 inductor is 10uH, but i could put only 47uH to it. It is a problem? I'm doing this wrong?
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2answers
169 views

LTC3649 step down controller (lab supply) add current limit feedback led?

On the 20th page LTC3649 there is a good typical application picture. How can I add a led if the set current equal the actual current? It is possible? Thanks.
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1answer
384 views

MP1584 EN pin voltage

The MP1584EN datasheet says: Absolute maximum ratings section: All other pin: -0.3V to 6V max. Figure 3 shows the 1.8V typical application. On the picture, there is a voltage divider: between GND and ...
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2answers
433 views

MP1584 inductor calculation

I would like to calculate the inductor value for MP1584EN.The datasheet says: $$L= \frac{V_{out}}{f_s \Delta I_L} (1- \frac{V_{out}}{V_{in}})$$ On the first page of the datasheet there is a typical ...
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2answers
522 views

V/f Constant control for single phase induction motor?

I am implementing a Variable frequency Drive control of single phase induction motor. I am little bit confused about the V/f ratio and voltage level. i boosted voltage upto 380V for Inverter . if i ...
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1answer
252 views

connecting -Vin and -Vout on a DC / DC converter

I'm making a small board for a DC / DC converter. Can I tie -Vin and -Vout together and think of them as GND? Is there some noise advantage to keeping them separate? Edit: the converter one of the ...
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2answers
2k views

How to obtain negative voltage from positive voltage ?

My question is simple. I have one power supply which generate 28 volt. I would like to obtain -18V and 18V. I don't want to voltage divider with resistor. I generated 18 V to use regulator. But I ...
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0answers
874 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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2answers
601 views

AC to DC wall adapter circuit

I'm trying to design an ac to dc conveter (230V ac to 12V dc). Haven't decided on the current yet. It's likely to be around 2A. I want the circuit to be compact and hence I think it is best to follow ...