Questions tagged [inverter]

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

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Inverter requirements for instantaneous water heater

I'm looking at installing a battery + inverter system for my apartment to keep things powered during frequent scheduled powered outages. I live in South Africa, where we have 2.5hrs "load ...
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Looking for an automatic switch to keep my two solar systems completely separate? [duplicate]

Here is a picture of my Queensland, Australian setup. My 4kW off-grid system needs to be completely separate from the house 3kW solar system, and also cannot touch the Energex meter box at all, ...
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Are there risks to running one computer with two completely different power sources? [closed]

I have experienced two computer power supplies using the same main power utility company here (same breaker, just different circuit). I am planning out an off-grid system, am considering running one ...
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How to optimally decide modified square wave duty cycle for an inverter?

Some high-end inverters synthesize a sine wave with high speed pulse width modulation and low-pass filtering, but most cheaper inverters use a square wave or a modified square wave. Modified square ...
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Can I replace 74HC04 with 74HC2G04?

Can I replace 74HC04 with 74HC2G04 if I only need two channels? In the original design it's there to drive ignition IGBTs: https://secu-3.org/wordpress/wp-content/uploads/hwdoc/SECU3irev1/secu3i-BB-...
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124 views

Why don't inverters use BJTs to easily produce a pure sine wave?

This has been in my mind for a while now, I'm curious. Why not use a BJT H-bridge on the high voltage side, to convert the high voltage DC to AC. I saw a simple circuit that converts square waves to ...
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Noise sensitivity to output impedances [duplicate]

A lower value of output impedance in a CMOS inverter leads to less sensitivity to noise of the inverter. Can someone elaborate regarding this? The quote comes from Digital Integrated Circuits by ...
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Why could a cheap electricity consumption meter break on modified square wave inverter?

I have a number of cheap electricity consumption meters of which I used one on a modified square wave inverter I bought. They cost less than 15 EUR per piece so most likely they don't have much ...
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How to evaluate inverter output voltage imbalance

It's easy to evaluate the voltage imbalance of grid output voltage, but I'm not sure how to evaluate the inverter output voltage imbalance. Is it to extract fundamental wave and evaluate the voltage ...
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2 answers
90 views

Can I use mains as backup for off-grid solar system?

I want to run 6 freezers/fridges (10kWh/day) with a 4kW array of solar panels, 4x 300Ah 12v LiFePO4 batteries, and a 2kW 12V Projecta Intelli-Wave Pure Sine Inverter. Instead of using a generator as ...
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2 answers
153 views

How can I test a variable resistor, while it is still in the circuit board? [closed]

How can I test a variable resistor, in the circuit? It is a 6p1 102, The ohms I am getting are approximately 1700 ohms. Is this normal for still being on the PC board? Adjustment knob appears to be ...
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IGBT Inverter machine gives -39 volt output voltage when probes connect to outputs reverse

IGBT Inverter arc welding machine gives -39 volt output voltage when multimeter probes connected to the outputs are reversed but when it is straight it gives the correct output value of 55 volts. How ...
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Tl494 with gate driver IC output voltage problem

Recently I've got my hands on some ETD42 ferrite cores and decided to make a 300W pure sine wave inverter. I chose the TL494 SMPS IC for driving the booster circuit (12 to 340V) and using the EG8010 ...
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Motor control, PP cap on VBUS rationale?

I often see PP capacitors (big blue thing) close to a H-Bridge or a three-phase inverter. However, on recent designs (Technosoft, Elmo, Maxon...) I see that multiple ceramic capacitors have replaced ...
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When using a square wave inverter is arcing a problem when installing a switch

A perfect square wave switches immediately from a high positive voltage to a high negative voltage. Does this mean that a switch installed in a circuit powered by a square wave power inverter will ...
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Confusion of measuring the stator voltage of induction motor [closed]

I'm new to inverters and the only way I know how to measure the stator voltage of induction motor is to connect the multimeter to terminal of junction box. So could anybody please elaborate more about ...
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Samlex power inverter PCB wiring schematic or test points

I am trying to find a wiring diagram or voltage test points for a Samlex 1500 watt PST150S-12A inverter board. Losing a/c output, have found a possible short on board. 2 of the 8 output mosfets have ...
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117 views

Safety of a polarized DC breaker between the battery and the inverter

DC breakers use a magnet to blow the arc into the quenching channel. If the current is flowing in the wrong directly, the arc is pulled into the guts of the breaker and can cause the arc to be ...
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Inverter MOSFET Snubber: RC or Schottky diode?

I've researched this question and found a lot of theory, but not much practical anecdotal experience. I would like to hear from those with physical knowledge of this. I've constructed a transformer ...
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Small vs large inverter efficiencies

I want to run a 60W device 24/7 through an inverter as efficiently as possible. I see that inverters become very inefficient at low loads relative to their capacity. Is this only because of factoring ...
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1 vote
3 answers
135 views

Bulletproof H-Bridge

I am in the process of building a low frequency (that is, transformer based) pure sine wave power inverter; 24 VDC to 120/240 60 Hz AC. The schematic I've attached is for one quarter of the entire ...
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1 vote
1 answer
358 views

Simple transformerless 3.7VDC to 220VAC [closed]

I am looking for a circuit design that could be capable of inverting 3.7VDC to 220 VAC. The maximum current draw is below 50 milliamps, and this circuit shouldn't have problem like voltage drop as ...
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Operation of the generic ka7500(tl494) based boost board and soft start adaptation

I am examining the operation of a boost card found in many cheap inverters, with a KA7500, EG7500 or tl494 IC type. Here is the diagram that can be found everywhere: My question are: what is the ...
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1 vote
1 answer
144 views

Portable AC power source earthing?

I have an 12V to 230V inverter in my car but get confused about ground it. The inverter is centre-tapped, means live-earth voltage is +115V, neutral-earth voltage is -115V, this gives an L-N voltage ...
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Battery capacity and parallel vs. series battery connections

Say you have 4 200 Ah 12 V batteries connected in parallel, this as I’ve come to learn increases the amp-hour value and not the voltage, and say you have another system same as that but connected is ...
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Inverter battery charging [closed]

If I connect a battery charger to my inverter AC output to charge the inverter's battery ,can I get a continuous power supply?
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How to calculate the maximum load that a standalone PV system can handle?

I have a 6820W pv panel, a boost converter, a H-bridge inverter, a 48V 540Ah LI-ion battery, a 100ohm dc and a 100ohm ac load in my system. My question is what is the maximum load that this system can ...
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Charging batteries with both an inverter and solar panels

I have an inverter, a battery bank, a PWM solar controller, and some solar panels. The inverter also supports charging the batteries from the mains power. So if I just plug the inverter into a wall ...
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67 views

How does the CMOS Schmitt trigger work

I have some questions on how the schmitt trigger works. Assuming we start with low Vin hence Vout is high. It means that M1 is ON thus the source of M2 is conducting Vdd hence M2 is On as well. ...
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Grounding li-ion battery pack to stop amplifier hum

I'm trying to connect a tube type guitar amplifier to the Delta 1300 watt battery pack by Echo Flo. The pack is not grounded so I get a hum. Echo Flo suggested connecting the amp to a power strip then ...
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Figure of Merit for sizing P-MOS and N-MOS in Inverter circuit

I am trying to design a basic circuit block of inverter (Analog circuit) in Cadence Virtuoso schematic in 22nm technology. It will be used for non-overlapping clock generator. I need to size the P-MOS ...
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Can I run a hairdryer from a 2000W pure-sine inverter connected to my starter battery, if my engine is running?

I'd like to occasionally be able to use a 1600W hairdryer for ~10 minutes. Maybe once a week, but only ever after a significant drive (and hence a well-charged starter battery.) My starter battery is ...
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2 answers
77 views

Inverter DC link voltage rises when motor decelerates

For a voltage-source-inverter (VSI) powered PMSM, as shown in the picture below, the DC bus voltage across the DC bus capacitor Udc normally drops frequently, which will cause no harm to the cap ...
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1 answer
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What is the function of a forward inverter and an inverted inverter in parallel in a digital circuit?

When I was simulating a divider using two D-latch as shown below (two D-latches in series,) I found that the circuit in the red rectangular is key to the differential D-latch. In fact, the circuit in ...
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158 views

LC filter for inverter

I am designing a 1500W inverter. With 24VDC input source and 220VAC 60Hz output voltage. I currently have the topology shown in circuit 1. This results in a square wave at 60Hz. But I need the output ...
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1 answer
50 views

Want to charge 24 VDC 600 Ah Li-ion house battery with overflow of 12 VDC 600 Ah AGM battery

I recently installed a 24 V lithium-ion battery and new inverter charger for house power on catamaran but left 12 V AGM batteries connected to separate DC system which also is charged by solar, wind ...
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2 answers
133 views

How to invert a NAND gate IC and have it work like an AND gate IC?

I have created this circuit design using tinkercad. I thought I had two 74HC08 IC:s. Turns out I only have one. Can I replace the second 74HC08 with an inverted 74HC00 and if so how do I do this? If ...
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Can I drive only one MOSFET/IGBT in a DC chopper circuit using IR2112 driver?

I have a three phase inverter that is driven with 3 IR2112 drivers board and microcontroller. I want to take advantage of the board and take two wires from these drivers pins to trigger one MOSFET/...
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1 answer
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Balance 3 phase inverter output

I have a 6kw pv solar system with a 3 phase inverter which splits the generated electricity equally across the 3 phases. I can't resell the excess capacity back so I want to make the most use of the ...
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Using an existing MPPT charge controller and solar panels with new battery pack

I have an off-grid setup at the moment to power most of my DC devices (bulb, router, NAS, NVR, etc.) I'm planning to upgrade my setup to a more powerful AC off-grid system to power my entire house. My ...
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2 votes
0 answers
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Monostable multivibrator edge detector not working as expected

I have the following circuit that consists of a Monostable Multi-vibrator, SN74LVC1G123 configured to detect a falling edge upon button press and outputs a logic HIGH which in turn is inverted using ...
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Help with DC to AC/DC converter

I need help understanding how this DC to AC/DC converter works. How can I find the transformer data (number of windings?) How can I modify it to operate at 5V? Can I replace the transistors with ...
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Active PFC design and simulation with reactive loads

While designing the building blocks of a double conversion pure sine wave inverter designed for standby generators, and specifically the AC to 400V DC conversion required to feed the pure sine wave ...
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2 answers
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What is this Z symbol on the PCB?

Does anyone know what this Z component symbol is? It was in my solar charger inverter and went up in smoke.
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Distorted output waveform and snubber heating in 3level 3 phase inverter

We are working on 3-level 3-phase 400Hz inverter (110Vrms). The problem is that the output wave still have some harmonics of the switching frequency. The snubbers are heating up rapidly when connected ...
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2 answers
94 views

Why not use a motor inverter for charging an EV instead of using an additional onboard charger? [closed]

I have had this question for a long timr now but never got a satisfying answer. Why do electric vehicles not use the built in inverter for the motor (PMSM or inductive motor) to also charge up the ...
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1 answer
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Design considerations for a TTL level MOSFET signal inverter?

I am replacing a 2N2222 BJT inverter circuit with a MOSFET. The circuit needs to feed into the CW and CCW direction pins on a motor driver board, setting one high and then the other at 8-10kHz. So the ...
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2 votes
1 answer
105 views

150 Ah flat plate battery only lasts 1.5 hours

I have a 150 Ah battery with a 1000 W square wave inverter. I'm only using the inverter for a 4 ft LED tube light, a router, and a gaming laptop (Dell g5 15 5590). I was expecting the battery to last ...
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Connecting a rectified and smoothen DC to an inverter

I'm preparing to build an axial flux generator and my plan is to generate 24v from the generator, rectify it, smoothen it with a super capacitor and then connect it to a 24v inverter. I want to avoid ...
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1 vote
1 answer
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Inverting a modulated signal

I'm modulating the message signal with OOK (on-off keying) modulation. Multisim software is used to model the schematic [attached]. At the resistor R1, the modulated signal is obtained. I wanted to ...
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