# Tagged Questions

Electrical device that converts direct current (DC) to alternating current (AC).

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### Electronic Drivers for Fluorescent Lamps: How is the DC-to-AC Conversion done?

Pretty much all (somewhat inaccurately named) electronic ballasts for fluorescent lamps run off a DC voltage and have to convert it into AC to operate the lamp. The DC supply can come from rectified ...
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### Convert 5VDC to 400VDC

I'm currently making a geiger-counter and therefore I need to crank my 5VDC up to around 400 VDC, the current is very low, around 0.015-0.02 mA. What would be the best way to generate 400VDC from my ...
4k views

### Powering laptop from 12V sources without inverter

This question has two parts: 1) How inefficient is it to boost 12V to 120V and then back to 12V as in using a traditional car power inverter to power a laptop (i.e. the 12V car battery power is ...
161 views

### How does an increase in operating frequency result in decrease in the size of an inverter circuit?

I was reading about inverters in a textbook where the author says that The size and cost of the circuit can be reduced to some extent if the operating frequency is increased but then inverter ...
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### How does an inverter affect the computer?

I have rampant power failure in my country. So to mitigate, we have an inverter that basically converts the charge from a big lead-acid battery to AC. But as far as i know this doesn't produce pure ...
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In this datasheet the logic diagram shows three cascaded inverters to get a simple inverting function. So that would mean that you have three PMOS-NMOS pairs in succession. Why is this better ...
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### How do transistors replace the electromechanical switch in an inverter circuit?

Quoting from wikipedia: "In one simple inverter circuit, DC power is connected to a transformer through the centre tap of the primary winding. A switch is rapidly switched back and forth to allow ...
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### Voltage used to charge a UPS-Inverter and its usage

I'm new to this area and know very little about electrons and how electrical components work. I'm always curious about Inverter/UPS usage. I'm from India and we have a inverter at home. It is ...
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### Can you offer suggestions for this voltage interverting circuit?

I have come up with this circuit, mainly through experimenting and trying things out. It basically inverts Vcc into -Vcc (chiefly for using as a V- for things like op-amps and other such low-power ...
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### What is the nature and history of UL capacitor recognition?

First, the background. I've been working on a grid-tied inverter design for some time now. General topology is: We've just completed UL listing our product under 508c, and the process was quite ...
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### How do I power a LCD Backlight inverter (got from a disasembled LCD screen)

I have two LCD Backlight Inverters lying around here and I want them to powerup without using any laptop part / motherboards. I want to power it by using a simple power source, I have both AC and DC ...
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### Building an inverter to charge various devices

With all the power outages being caused by Hurricane Irene, I thought it might be useful to have an inverter that I could charge my cell phone with. Plug in battery power on one end, cell phone on ...
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### which kinds of electrical equipment need a pure sine wave inverter to work correctly?

I am planning to purchase a good inverter, and pure sine wave inverters cost about 3 times as much as modified sine wave ones of the same power. I am thinking about a 2000W continuous/4000W peak ...
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### What's the difference between an inverter with a bubble at the input and one with a bubble at the output?

See this datasheet, page 2. The diagram shows logic inverters with bubbles at the input or at the output. Is there an actual difference between them?
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### Plugging a UPS into an inverter

First off, I am aware that plugging an UPS into an inverter is a bit redundant. The only situation I can think of it being useful is in a car when you want full amps for cranking over the motor but ...
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### Uses of inverters in this circuit?

In this article, http://www.edn.com/design/test-and-measurement/4391393/Single-hex-inverter-IC-makes-four-test-gadgets, A circuit is used to detect a user degined low logic level and high logic ...
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### Recomendation for a digital inverter made of discrete components

I have a digital circuit in which I need only one logic inverter, and both PCB size and power consumption are serious constrains. So I thought about using a pair of complementary SMD MOSFETs (the ...
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### Design Tips on making a battery powered inverter with 5A output

I'd like to make an inverter that can take an input DC voltage of 13~16V and give an output of 120VAC at 60Hz that is capable of providing up to 5A (perhaps more). For the battery, I would be using ...
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### Is there an IC that inverts DC==>AC at the resonant frequency of a tank connected to it? (~50V ~40A)

Assuming I used the word "tank" correctly (something that has a resonant frequency) I have been working on a circuit that has 4 leads--two for DC input and two for AC output--such that you can attach ...
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### Diagnosing LCD backlight inverter problem

I am having problems diagnosing the error with a notebook LCD display inverter. Symptoms: After switching the notebook on, the LCD backlight comes on but the intensity oscillates rapidly (flickers). ...
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### Hex inverter floating outputs

For a project, I am connecting the output ports of a 74AC04E hex inverter to bnc ports. Something could be (but not necessarily) be plugged in at one or more ports at a given time. Should the ports ...
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### How do I convert 12Vdc solar to AC?

We are using 12V DC solar power at home, and I want to use it for home appliances. Can you suggest what should I have to use for this? At present we are using 4 (12V) lights and one DC fan. Now we ...
496 views

### Controlling Voltage or Amperage with a PIC

Although I have a fundamental understanding of electronics, I still have much to learn and this one has me stumped. I am trying to control the speed of a TB Woods SM1 AC Inverter drive that in turn ...
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I'm controlling an IGBT inverter with a DSP. I'm pretty sure I turned on two IGBT's at the same time which made a short circuit. The PCB I'm using to step up the PWM signal to drive the IGBT's let the ...
268 views

### Measure the leakage current of a CMOS inverter

I would like to measure the leakage current of a CMOS inverter. As this current depends on the input, I decided to measure something average, namely, the leakage current of a ring with two CMOS ...
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### Correct EL Driver Rating for 8 Channel Sequencer

I'm trying to use an 8 channel EL sequencer (found here) to control eight 10-foot segments of EL wire. I'm having trouble figuring out what the appropriate length rating is that I need on an ...
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### Oscillator for High Voltage Transformer: RLC or Blocking Oscillator

What type of oscillator is being used in the schematic? How is that particular oscillator working in this circuit? I'm less than confident with oscillator theory, and I can't tell if this is RLC or ...
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### 500W Inverter + Laser Printer

I have a laser printer that I've been wanting to use on the go in the car with an inverter. The power consumption section in the printers manual: ...
197 views

### Charging a small 100uF 450V capacitor with a small battery?

How can I easily charge a 450V capacitor with a small battery such as a 1.5V or 9V while stepping the voltage up in between so as to provide a voltage near 450V for the capacitor? I'm looking to ...
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### Where are the losses in an inverter-type portable generator?

I have an inverter-type portable gasoline generator that is rated at 3kW / 3.3kW surge. In the service manual, the engine's power output is said to be 4kW. (The engine's displacement is 269cc). I am ...
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### High output current hex inverter in SMD capsule

I am trying to find a hex inverter which has as high output current as 74AC04E (50mA) but surface mounted. I haven't had any luck so far...
799 views

### CMOS inverter with gate of PMOS transistor always grounded

If there is a CMOS inverter such that the gate of the PMOS transistor is always attached to the ground and the input voltage is only applied to the gate of NMOS, then how would the inverter behave, as ...
1k views

### LCD backlight CCFL lamps power supply

I have a quantity of LCD panels (from a wide range of dead laptop) and I would like to use only the CCFL + diffusors as a "creative" light source for a room in my house. Is there some sort of ...
164 views

### CMOS Inverter Equal Rise and Fall Times

I am currently attempting to design an inverter in Microwind layout software that has equal rise and fall times. Rise time is defined as the time for the circuit's output to go from 10 percent to 90 ...
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### Suggestions for use of 320V 100W solar panel? [closed]

I have recently acquired a 100Watt 320VDC (429VOC) flexible solar panel which I would like to use on my boat. I may buy more of these panels if I can find an affordable way to use them. The cost of ...
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### How to make your own EL Wire (electroluminescent wire) inverter

I would like to make an EL wire (electroluminescent wire) inverter because I can't seem to find a commercial inverter that can drive the right length of wire from the batteries I would like to use: ...
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### Is it possible to build a inverter that operates at a frequency set by an LC tank using ONLY that LC tank and transistors?

I was always dissatisfied with inverters because it seems like an LC tank and transistors would be all you need. However, after much time spent simulating and a few false positives experimenting, I am ...
2k views

### Is this a good “pure” sine wave inverter design?

I'm in the initial stages of designing a pure sine wave inverter. My design is as follows: Wien Bridge Oscillator (5V at 50 Hz) -> Class D Amplifier -> Output transformer My question is, is this a ...
127 views

### Trouble using marine batteries with UPS

First, let me premise this question with the fact that I'm not well versed in electricity. Here's the problem: I am trying to power a UPS with an inverter and two deep-cycle batteries run in ...
363 views

### My inverter keeps flipping between battery/mains slowly at first, then faster. Why?

Here's the situation. I'm possessed of an inverter purchased nearly a decade ago. A few months ago it started to make a clicking noise of it's own volition The repairman said he replaced the relay ...
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### 1kHz AC from mains power

I've got a plan for a large electroluminescent display. EL panels are typically driven with a sine wave at around 1kHz, and I want to use mains power for this. What's the best way to convert mains ...
126 views

### Does performance of PV inverters degrade over time?

Does anyone know if the performance of solar inverters degrades over time? If so what is the mechanism?
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### Why does there have to be a load in MOS inverters?

I have been studying about inverters for a while. In the book that I was reading, inverters have been explained according to the type of load connected to the drain of the driving transistors ie. ...
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### How does this MOSFET circuit work?

The following circuit from a textbook models an inverter implemented by a MOSFET switch. I understand how in the first case Vout is zero, but in the second case(the switch is open), the textbook ...
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### Inverter ICs for (5v DC -> 5v AC) and (9v DC -> 9v AC)

What are some ICs that can turn 5v DC into 5v AC? How about 9v DC into 9v AC? I'm wiring up the liquid-crystal lenses from active shutter 3D glasses to be electric-powered sunglasses. Depending on ...
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### Can I get a square-wave inverter as source for my laptop charger? [closed]

I have a solar power which it's power is stored in 12V automobile battery. And use inverter to produce 220V AC to feed common equipments. The inverter as shows symbolic gets a square wave. It ...
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### 74LS04 (5 V) outputs 1.2 V to input pins

I have tree 74LS04 inverters and I cannot make them work. When I connect device to power and ground and measure input voltage pin using multimeter, it read 1.2 V, which I expected to be 0. The device ...
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### Design a simple circuit to generate -21V..-24V from +5V

I have got an old-STN-LCD which needs a very negative voltage, -21V..-24V are required in order to do the proper contrast, a current of less than 200nA is required, the LCD controller also requires a ...