The cap will limit the voltage rising speed and the diode will gradually start to conduct some current. So there is no possibility that this cap could suddenly dump its charge into the diode. The variant in my head was used a long time ago. You move up or down by stepping from one of the ladders to the other at the right moment. Does anyone know how this is called? Youtube link? Having built some excessively large multipliers stepping up from around 30Kv and able to throw a nice spark a good mm I found the best option was to drop the multiplier in transformer oil.
I built an Ion Gun many years ago this way using an old automotive strobe light casing. The down side was the emitter was not far enough forward and given the trigger was just under mm from the emitter the first and last firing using the trigger was a little shocking.
One of the coolest uses however was to sit a small Z shaped rotor on the pin at the end with the unit sitting upright, turn it on and watch the rotor wizz around real fast as the negative ions were being flung off the points. In my early years as a radio ham, a circuit much like these were called bridge rectifiers. They let me get up to to volts out of TV transformers intended to produce volts.
This is actually closer to a half wave bridge than anything. If you look at the wikipedia article on the Cockroft-Walton Generator, you will see that you are actually looking at one half of the full multiplier.
If driven with a true AC sine with zero crossing , you are better off with the full wave variant. These actually do not have to be driven by a sine wave; a lowpassed square works equally well although slightly less efficient in some cases.
Voltage multipliers used to be used in TV sets. A doubler to get about twice the peak line voltage for the horizontal output. Also sometimes another one at the output of the flyback to step up the voltage for the second anode of the CRT.
I presume this was to reduce the cost of the flyback transformer. The solution was a 10 stage C-W multiplier, with each stage supplying the volt dynode to dynode drop in the 10 stage PhotoMultiplier tubes. The PM sockets were removed, and the C-W was fabbed directly onto the PM wires, then the whole shebang was primed and silicone rubber potted onto the tube.
The VAC sine wave supply gave us no corona noise issues! We rode on the first satellites to leave Earth orbit. About a dozen years later, the one spiraling toward the Sun passed Earth, giving us another ,, miles of data! All 3 C-Ws were still cranking along. The C-W multiplier lives on in outer space! So the higher the frequency of the AC input power the better? I wondered because these days solid state power amplifier chips can handle very high loads and high frequencies so a custom high frequency AC supply may not be that hard for a DIYer to do.
A car stereo power amp would work dandy. Find a suitable switching supply to power it, hook up a signal generator to the input, and you have the speaker output. Wire a normal transformer as step-up and add your multiplier. They have built in overloads, easy to control output and if you blow a channel there are 1 — 3 spares depending on the model.
My first helium-neon laser in the s used a voltage multiplier in its power supply. Good on you for getting things going with what you had : and not turning us into popcorn. So was it or did the other things detract from the giant bug zappers? I know, I know, wikipedia puts the diagrams side-by-side already.
Typically you have a generator rated at 6VAC, but depending on speed you get V. You can easily rectify and feed a linear regulator, but inefficiency in this application gets applied as resistance at the generator, which ends up meaning you pedal harder for the same speed! Aluminum electrolytic capacitors are an obvious choice, providing excellent energy density, CV, and cost.
However, there are a number of factors engineers should carefully consider for these designs:. An ideal capacitor introduces zero resistive effects to a circuit. Real-life capacitors are not ideal, however, and do introduce resistive components. The most important of these effects is the equivalent series resistance ESR.
This resistive component is primarily what causes it a capacitor to dissipate power, which creates heat and shortens its life span. AC current through a capacitor dominates the heat generated by a capacitor. In the case of a voltage doubler, the AC component of the voltage on the capacitor is the ripple voltage.
The frequency of the AC signal is another factor, where a higher frequency will generate more heat. And finally, a portion of the current the capacitor supplies from its stored energy to the load is also lost to heat, so higher current load applications generate more heat. The load supplied by the output is another critical item for a voltage doubler because the output is poorly regulated. With a resistive load, a higher current causes more voltage decay between voltage peaks, causing the DC voltage to sag and the ripple voltage to increase.
The power output of a voltage doubler is limited by the input power and the efficiency of the circuit. So the maximum theoretical output current of a voltage doubler is half the input current. Because of this, voltage doublers are not ideal for high continuous power applications. Rather, they are good for loads that require high voltage charges, but not high power. In the case of an inductive load, the reactive characteristics of the load can cause a reverse bias voltage to feedback to the voltage doubler.
Aluminum electrolytic capacitors are polarized and can suffer catastrophic failure when reverse biased, which is often a concern when they are used to drive inductive loads. Most electrolytic capacitors can withstand a small reverse voltage up to Voltage doubler is basically a circuit, consisting of two semi- conductor PN diodes rectifiers and two capacitors, arranged in the form of bridge construction.
The capacitors and rectifiers are arranged as shown in the figure. The two capacitors, C1 and C2 are connected in series with each other and also with the load. In voltage doubler circuit the alternating current will first flow in a clockwise pattern and then in anti clockwise Indicated by arrows in the diagram.
When the current flows in a clockwise direction, the rectifier R1 will charge the capacitor C1 till the voltage reaches the peak of the positive voltage wave. In the similar manner, then the current flows in an anticlockwise direction, the rectifier R2 will charge the capacitor C2, till the voltage reaches the peak of the negative voltage wave. As both the capacitors are in series with each other and the load, the opposite voltages generated in both of them will add up and discharged to the load.
Thus a doubling effect will be produced, delivering a voltage which is twice the input. However, it is to note that the system will work only if the load is very small. In case the load increases, the doubling effect will not be produced.
0コメント