Voltage regulator for the generator
I did not find a voltage regulator on Mosfet N. Maybe the factory ones are in this technology, but they are usually sealed and you can't look. One thing is certain, these are one of the most emergency components in aggregates. The one I cobbled together should be more resilient.
A description of the action.
The voltage divider is on the zener diode to reduce the quiescent current draw. The diode is theoretically 12 V, but I easily selected one for 11.8 V. The capacitor reduces the switching frequency. The TL431 switches at 2.5 V. If we add with a zener diode, it comes out to 14.3 V. This voltage is optimal. The optocoupler separates the other side of the circuit. Motorola transistors amplify the current. Transil 33 V at the end protects the Optocoupler and has what to do. The no-load winding generates 20 V.
I put the bridge at 100V.
Summary.
The system is deliberately built with a minimum number of elements. It was supposed to fit in the original housing with a heat sink, on a universal board. I milled the original content because it was well glued.
If I screwed something up, I'm reluctant to know about it. However, the system is still working.
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Comments
Add a commentWhat exactly is this zener diode for? It just ruins the stability of the 431. To limit the current, you could have added larger resistors or a second optocoupler to disconnect the voltage divider when... [Read more]
What exactly is this transformer for? I would also remove the Zener diode from the TL divider (I would protect the MOS gate with it, but with the value of C15) replacing it with a selected resistor, and... [Read more]
I'll throw in: Why two transistors (Motorola transistors) to drive the MOSFET gate? This is not a converter where we want to switch a transistor in 50 ns, but a very slow linear application. The reaction... [Read more]
As far as I know, analog circuits have outlived many converters. As for the performance being bad, that's another story. Cooling needs to be calculated, choose the right radiator and determine the... [Read more]
The fact that a high-voltage transistor and a Zener diode in the gate is very good, because in such a system, for example, when the battery breaks, overvoltages may appear. A system with the ability to... [Read more]
Nothing will help. The battery will break, the generator will give high voltage, the transistor will take it on itself and start to heat up. High SOA is needed, not high voltage. And the gate can be secured,... [Read more]
And the impulse ones that give "several dozen" amperes do not have fans? Not completely. Here the fact is that the weight and dimensions are large, but believe me, you can build a good linear power... [Read more]
If there is such a need (and the customer is able to pay for it), they do not have it. Quick proof based on the contents of a drawer in the garage https://obrazki.elektroda.pl/1771377700_1667748098_thumb.jpg... [Read more]
But the dimensions also increase x2 with a power of only 250W. [Read more]
More often they don't have than they have :) You give @spec220 some real 250W 12V linear power supply on the hit. Data + photo please. Please show the forum what outstanding constructions I have overlooked... [Read more]
Just take into account the fact that the TL at full control (exceeding Vref) does not short-circuit like the transistor, there is only a KA drop of about 1.8 V, add to this a drop on the MOS gate divider. ... [Read more]
Let me criticize something. The capacitor loads the zener diode too much. However, I prefer Zener over resistors, because at high values, dust and moisture will affect the voltage of the divider. Why IRF640?... [Read more]
So if you prefer Zener, why do you need this TL431? In fact, it will be slightly better, but only "slightly". I don't understand this at all. You mean "kick" when power is turned on? This gives... [Read more]
That's how it should be. [Read more]
Ladies, do you read with comprehension? ;-) I gave the example of the power supply as proof that it is possible to make a system that dissipates a lot of heat and is reliable at the same time, and not... [Read more]
It will turn off without any problem in reverse, because the MOS works as a diode, while in the direction of conduction, if it is sufficiently driven, it will also turn off, because the channel is open.... [Read more]
The winding does not give more than 2 A, so there will be no heating. The original regulators died when the battery was disconnected. This one will be fine. [Read more]
This capacitor introduces a slight delay, but the zener diode also gets a slight kick when sparking. Some kind of limiting resistor would be useful there. [Read more]
In practice, it turned out that the capacitor is unnecessary, because it is one winding, so alternating current probably with 300 Hz, so why slow it down? (on the table I played from a linear regulated... [Read more]