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Questions tagged [inverter]

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

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45 views

inverter circuit

My inverter only produces about 8 volt output while the supply is as high as 20vdc, what's wrong with my inverter circuit ? ...
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1answer
57 views

Why use many-pole motor for high speed?

I found in this teardown analysis of the Nissan Leaf drive motor that it runs up to about 10,000 RPM but is an 8-pole motor. My understanding is that the inverter cost goes up with frequency. The Leaf ...
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1answer
33 views

Signal Period of each stage in a ring oscillator

Considering the following ring oscillator: I know that the Frequency at \$Q\$ is given by $$f=\frac{1}{2*t_{PD}*3}$$ Yet I want to calculate the period of each signal at \$V_{1}\$,\$V_{2}\$, and \$...
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27 views

R_on for inverter gate

What \$R_{on}\$ do I use to calculate the delay for an inverter gate? In my class we came up with two definitions of \$R_{on}\$, one for saturation and one for triode. Is there a certain mode I ...
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25 views

Converting full adder to subtractor using inverter

I've been trying to convert a full adder to a full subtractor using an inverter. I tried using not gates at the B input ( in A B Cin ) and also using it in the outputs but the final answers are not ...
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1answer
72 views

Voltage spikes in h-bridge inverter square wave output

I apologise if this is a repost but I couldn't find the problem anywhere else. I am trying to power an ultrasonic transducer using an h-bridge inverter design to convert arduino signal into a higher ...
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3answers
48 views

How is the fuse amp rating determined for a 12V AGM battery bank?

I would like to put 3 x 130Ah AGM batteries in parallel and attach a fuse to the positive terminal of each battery. What size fuse should I use? How is the amp rating of the fuse determined? The ...
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31 views

CMOS Inverter output for a given transfer characteristics

I have tried solving the below CMOS problem with a given transfer characteristics but my answer is wrong. Answer should be 0.25. Could someone please point out where I went wrong ?
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1answer
48 views

Creating Neutral node on Three phase Inverter

I want to create a neutral node at the output of a 3-phase Inverter for ACIM. Is it possible to do that by adding 3 resistors at the Inverter outputs and join them together to get the neutral node? ...
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1answer
55 views

Two level Inverter [closed]

What thing determines a 2-level and 3-level Inverter as in the diagram? edit: Level is as in 'voltage level'. I have found following good link that explains it. http://www.elkraft.ntnu.no/~richardl/...
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49 views

Controlling simple servo motor forward/reverse pattern using 555 IC timer and H-bridge (no micro-controller) [on hold]

Need some help understanding how to build this circuit: The user will switch the device on servo motor rotates a gear for a constant number of revolutions in the forward direction the motor then ...
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2answers
36 views

How does the power efficiency of an appliance compare using 12V DC or 240V AC with an inverter?

With an off-grid system, if an appliance supports powering via both 12V DC and 240V AC, is there any difference with the power efficiency of either method excluding the draw of an inverter used to ...
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50 views

How to calculate propogation delay from an I-V curve of a PMOS transistor (CMOS inverter circuit)

How does one find the total propagation delay using the formula $$T_{pHL} = C\frac{V_{swing}/2}{current_{average}}$$ from the chart below. How is the \$current_{average}\$ derived?
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18 views

Low voltage ride through (LVTR)

Nowadays, I see that photovoltaic systems have Low-voltage-ride-through capabilities. So in case of a fault, when the voltage is decreased, they remain connected to the grid and provide reactive power ...
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1answer
70 views

Starting point for DC/AC-inverter

What I have: 5VDC and / or 12VDC, a PIC micro What I want: Floating 9VAC 50Hz, able to output 1A. Googling details for this kind of inverter seemed to be a tricky case. There are a few DIY-pages ...
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41 views

SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation

I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor. Since one can choose which zero vectors (000 or 111)...
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1answer
55 views

Equivalent DC circuit of 3 phase induction motor

I'm currently trying to model a simplified circuit of an inverter + 3 phase induction motor. For now, I want to represent the DC link as an ideal independent voltage source. To keep this example ...
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2answers
62 views

How to reduce the frequency of ferrite core transformer? [closed]

I am trying to do a inverter using ferrite core transformer, but the problem is the frequency output from the ferrite core transformer, If I am using that, I will be getting 230V AC but the frequency ...
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1answer
179 views

DIY rotary inverter technical and economical feasibility

I’m setting up a solar panel system (200W) that’s used to charge batteries that will power small appliances in a converted van. Solid state inverters are expensive and difficult to fix and it seems ...
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36 views

Guidelines and design considerations for designing a controller for a grid tie inverter?

I'm working on designing a controller for a grid tied inverter. I'm not able to find a suitable reference or book that might help in this case. What I have understood now is: There must 2 loops (...
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1answer
55 views

Question on TWO stage power conditioning

Suppose a induction motor is connected through a inverter. Inverter is fed from a DC-DC boost converter. My question is: to boost converter how load current will look like? Will it look like DC or AC?
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1answer
41 views

PI controller - DC voltage regulation

I a voltage source converter, in order to control the DC-Bus voltage a PI controller can be used. The control method is illustrated in the figure below: I would like to ask why the input of the PI ...
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35 views

dc sweep convergence issue for cmos inverter

I am having some convergence issue with DC sweep for a CMOS inverter. To duplicate the exact issue, see the following log as well as the attached netlist files, together with modelcard.nmos and ...
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28 views

How does using PWM generator to control inverter work in Simulink?

I am trying to model a PV system connected to the grid and use PWM generator to synchronize the inverter output with the voltage condition on Grid. I figure I need to use Three phase PWM Generator ...
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43 views

Voltage fed versus current fed Inverters

I would like to ask about voltage fed and current fed inverters. I know that a voltage fed converter uses a capacitor as the storage device while a current fed converter uses an inductor. What are ...
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1answer
68 views

Voltage sampling from 220vac to 5vdc

I made a 1 phase to 3 phase inverter using arduino and IR2104 to control the speed of an induction motor and it is working perfectly. To complete the protection scheme, I need to monitor voltage of ...
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70 views

How does this circuit with inverters work?

What this does this circuit do? I suspect it is an amplifier, but don't know how it amplifies. For example Inv 5 and Inv 6 are connected in parallel with reverse sides but there is a wire between ...
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1answer
32 views

Inverter Mosfet Driving with Isolated Totempole Supply

simulate this circuit – Schematic created using CircuitLab I'm trying to make an inverter and I'm driving my mosfets with totempole configuration, the thing that confuses my mind is: Totempole ...
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1answer
50 views

Can I use 220V inverter as 12V power supply?

I have a pure sine wave inverter, it charges a 12V battery and converts 12V from battery to 220V during a power cut. Since it can output 12V to charge the battery at quite a high current I was ...
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3answers
80 views

Inverter feedback when converting clipped sine oscillator signal to square wave

I inherited a design that uses the following circuit to generate a 40MHz square wave clock signal: KT2520K is a TCXO that outputs a clipped sine wave and the inverter has a peak output voltage of 3....
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23 views

Question about Space vector modulation

Currently I'm learning about SVM and I have a question. If for example SVM method is applied to an inverter for motor control, is it necessary to know the values of the three phase voltages for ...
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1answer
46 views

3 Phase calculations

I have 3-phase utility mains power supply whose phase voltage is 220 V, 50 Hz. I keep getting confused about various calculations of the 3-phase mains as follows: Formula for the line voltage. ...
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22 views

Charger and inverter wired in parallel

I have two large lead-acid batteries (208ah) that I’ve acquired. I’d like to connect a float charger to keep them charged and at the same time connect an inverter to run a few select loads. Normally, ...
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1answer
59 views

How to remove noise in inverter

1000w sine wave inverter I downloaded the above schematic from the web, I constructed it and its functioning OK. My problem is that this inverter causes distortion in my sound systems even with the ...
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1answer
34 views

What is the effect of very small AC frequency deviations from the grid on invertors and transformers for normal comsumer objects?

What additional wear or inefficiencies are there from inverting a AC signal to DC from say, 59.99 hertz instead of 60.00 hertz? And is there additional wear on transformers? How do small deviations ...
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28 views

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 ...
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1answer
50 views

Mini solar panel to DC motor

I have a mini solar panel 5.5 V 1 W 180 mA and I want to connect it to my DC motor 3-6 V. I tried directly but it didn't work. After some research I found that I needed a inverter. My question is: do ...
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1answer
70 views

What's the magic behind inverters? [closed]

I'm having hard time understanding how inverter works and why it works. I mean why is it possible to power a say fridge (220V AC) with a 5v battery using a 5v to 220v inverter ? And since this is ...
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1answer
89 views

Does the lack of a primary DC blocking capacitor cause my tesla coil driver to explode?

Lately I've been tinkering with an SSTC half-bridge driver. I've ran a couple of tests using relatively low input voltages ~50V and the IGBTS seemed to do fine, there was no noticeable heating at all. ...
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2answers
107 views

Modelling 3-phase induction motor and filter for inverter output in LTspice

I am designing an inverter in Ltspice and am looking to have a simple circuit to represent the motor load and filter out the PWM harmonics in order to obtain outputs. The motor characteristics are: ...
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1answer
53 views

Voltage controlled versus current controlled Inverter

I would like to ask about the voltage and current controlled inverters. In a current controlled inverter, the control target is the output current and they provide high quality current to the grid. ...
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2answers
59 views

How to maintain a stable voltage on a Wind Turbine for Inverter

I'm doing some experiments on a wind turbine in my spare time. At the moment, my system runs well and I can measure good output values from my generator. For example: 38V @18Hz at 30 RPM 97V @37Hz ...
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20 views

UART Current in PIC18F46K22 & 7404 Input Current

I am currently making a decision to invert the UART signal from my PIC18F46K22 and have 2 choices to either use 74LS04 and 74HC04 but there is a difference between the LS and HC that the LS can output ...
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1answer
62 views

(inverter repairs) Does reverse polarity can kill power MOSFETs in UPS inverters? [closed]

I had an old computer UPS (almost 7 years) and I modified it to use external battery (a 12 Volt motorcycle battery) since the old 12 Volt battery is completely dead and no replacement is available for ...
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2answers
177 views

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 ...
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1answer
45 views

Slew Rate related EMI: How relevant is it for motor control circuits ?

I am designing a 3-phase inverter board for BLDC Motor control. The H-bridges i use are IFX007 from Infineon. The mentioned IC has the possibility to adjust the slew rate. From what i have read, i've ...
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1answer
68 views

Output voltage of 3-phase in / 3-phase out inverter

I am using UK mains (230 V phase, 400 V line) to drive a Japanese motor expecting 115 V phase, 200 V line), presently using 2:1 transformers. I would like to control speed between 30 and 70 Hz, ie +/- ...
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2answers
87 views

LTspice- Huge current spikes across MOSFETs in full-bridge inverter

I have designed a simple full bridge inverter in LTspice. The outputs for voltage and current are as expected however I have huge current spikes across the MOSFETs which I am using as switches and are ...
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1answer
39 views

How does the transistor topology look like for a gate of this logic inverter?

How does a single inverter gate of this hex inverter, look like in transistor level? I don't mean the actual photo, but how does the transistor topology look like? Does the BJT inverter (see below),...
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1answer
67 views

Inverter with PWM: Modulation Index

I model an photovoltaic inverter in simulink. The Inverter has a PWM, a current control and MPPT. The PWM pulses are generated by comparing the reference sinus signal with a triangular signal. The ...