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Kevin Weddle
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Posts posted by Kevin Weddle
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An opamp can be used out of saturation to amplify a digital signal. A very high gain, which would not be needed with the 12v signal from the pulse width generator, would be less stabile.
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A sort of variation of a buck converter could be used in this case. A simple fixed pulse width generator can allow the control opamp to supply input to a regular 5V voltage regulator. An electrolytic capacitor would be needed at the input to the regulator. The opamp could be made stabile enough out of saturation, possibly.
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Indulis, are buck converters used very often? They're not standard regulators which I have seen more often. Maybe they can only be used for certain applications.
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Are analog ammeters worth purchasing? I'd like to buy a few low current ones. I've never seen them used in low current circuits.
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That's a good question. I've seen those flashing light displays at Christmas time. A specialty store of some sort if you can't find them at the local stores.
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200m of cable carrying 2 KVrms sinewave at 2 KHz requires only a small guage stranded wire.
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Looking again at the design, the ground symbol is very similar to the the voltage source signal. So the design isn't over engineered and is a basic H-bridge. It has two main series circuits which supply voltage to the device. Only one of the series circuits is used at one time. The desired result is normally AC which will not be referenced from the H-bridge ground.
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The circuit looks alright. Input A and input B are not specified, but the circuit is much over engineered and needs simplification. What type of device uses this?
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Many analog IC's require very large external design to be compatible with a system. Aren't there more variations to IC's that are more useful and less accurate? The whole of the circuit design is very limited. Not knowing much about the availability, are there more manufacturers with better variations of IC's.
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Another aspect, is not only will the 5v charging system need to regulate at 5v, it must also not overcharge a low battery to quickly. The same as the slow charge fast charge switch on an automobile battery charger.
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A 5v charging system, I'll guess to charge a 5v battery, will include resistors and capacitors too. The idea is to start with a higher voltage and a regulate the ouput at 5v. Automobile battery chargers are suited for general auto battery charging, while others are designed to charge less durable, higher technology small capacity batteries. What's the capacity or Amp/hr rating of the battery?
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What is the circuit generating the pulse? Digital electronics produce pulses at 5V and maybe 3.3V. 140ns eliminates many integrated latches which operate at logic levels. It's possible even a latch at 140ns will not trigger with the circuit supply voltage. I'd use a use a two stage high frequency BJT common emitter gain circuit and a high enough frequency latch.
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There is nothing wrong this stabilized 30Vdc power supply. Having not tested the orginal circuit, it must be a good design, or it would not be posted. Since it's a good design, but doesn't meet your requirements, a totally new design is needed. The engineering principle behind this design is found in many different power supplies. Can't you just buy this power supply from the website?
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Integrated amplifers have become synonymous with circuit development. Their gain or their function is excellent as is shown by specification. But most designs are very large and dependent. Do you guess on which IC might be the right one?
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Another thing to consider is the ability of solar panels to be used with reactive loads. If they can, the apparent power consumption will be an additional loss in power transfer. You must have a good size and expensive solar panel. I wouldn't risk in damaging it.
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No. The voltage regulator can be any high current 12v regulator. A very efficient DC ro DC converter has to be used to increase the power efficiency of a circuit powered by a solar panel, and that may not even be efficient enough.
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You can't mean a high current voltage multiplier can't be designed from an oscillator. Many high power oscillators use low power oscillators which again get power gain. You can't use electrolytic capacitors because their voltage rating is too low. The inverter designed using a voltage multiplier will have the AC composite and the NE555 timer will need to be decoupled so that the other voltage mutiplier can produce the negative cycle. The two circuits can be switched on and off at 60Hz.
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Capacitors are good power transmission components. But electrolytic capacitors, which have the most capacitance, are low voltage. You can combine numerous electrolytic capacitors and achieve a very high current. The NE555 timer can be used or another IC or circuit.
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Simple nonlinear loads can be found in many components. Most of the time, large transistor based circuits are used. Nonlinear loads are really important in circuit development.
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I dont' recommend any circuits I know of. If your design is functional, it may be worth developing. There are many electronics products I have no experience with.
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Diff amps are still more like opamps. The instrumentation amplifier your designing is going to be inherently poor because the voltage is too high. The problem is that the ouput will be noise. Only a fragment of the signal will remain, but it may be useful.
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Having been out of school for a while, the text books are probably leaning towards more contemporary ideas than they used to. But the electronics industry has been growing massively. Just about anything your interested in is worth the study. Communications is popular, but it's diverse and is on the complicated end of electronics.
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The PCB consruction for both high frequency and low frequency circuits is more complicated than that of the average use for this power supply. I would say to use a simple solder and wire circuit. Most often the problems will be the rest of the circuit. If you can fabricate a PCB, use larger conductors that will handle the current.
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I don't know of any inverters that can power 220V motors. A 110V inverter is useful for powering small appliances from a battery, but it is better to purchase one because of the complexity of their design. If you can't get the motor to turn, either the motor voltage or the frequency is too low.
Buck Converter Design Problem
in Power Electronics
Posted
The input voltages are very high, making the control circuit difficult to design. An ordinary opamp and PWM couldn't be used. The main pass transistor should be a low on Vds FET or bipolar transistor operated between cutoff and saturation to achieve higher efficiency. The inductor capacitor filter is absolutely necessary. Choosing the values might be done by load testing.