Youtube healthy greetings This time I will practice making Adjustable regulator 0-60Vdc In what order do I do this experiment So feel free to try it at home First, experiment with a 12 volt voltage With a used Zenner 5V charger The circuit is like this Here I use an IRF540 mosfet A transistor 3055, as a current driver That this circuit is a correct regulator, I proved in the previous video And in order to work, with the effort we want All you have to do is change the amount of Zenner The example here, if you want to make a 60Vdc regulator Then we need Zenner 60V Because I don't own it Then I use Zenner 12V 5pcs Who am I the spouse in the chain And resistor Because the planned input voltage is 65Vdc So R = (65-60) / 20 mA = 250 ohms Estimated selection of 20mA is based solely on experience Then I plug in series, 5 pieces zener and resistor I am a solder And yet strung together To try, use low voltage first For example 12V Then I tried If the output voltage can be adjusted, it means OK And check the temperature of all components, especially the mosfet Then, try to weigh her down Here the load I use a 12V 10W bulb Before trying, just use a small effort.
An example here is 3.45V Well …. I try And the current is unreadable, about 200mA And check temperatures on all components Especially on mosfets and transistors Yes, the transistor is not hot yet It is experience, when currents less than 500mA are used The transistor has no heat at all If ok, you can continue Then immediately try the effort we want Because this circuit is definitely OK So I put the thermometer on the transistor like this I just pinch, so it can be seen when increasing the temperature on the transistor Well, I am giving the input voltage I plug it in The input voltage reads from 70V, not 65V no problem This is due to fluctuations in the input alternating current This is a transistor temperature gauge Well, I try without burden With mosfet, the voltage can reach 0V to max And the maximum voltage of 54.9V The voltage should be the maximum Znr Voltage – Voltage Vsd For example Vz 60V, then Vout = Vz-2.5V = 57.5V Apparently, the zenner I installed in series was only 57.5V, not as low as 60V Well no problem But …
We hope you understand Then I try to burden You guys set up a little Vout first Note, the output current and temperature of the transistor For the first time, don't call right away … just touch her like this And check temperatures on all components If something is hot, you just install it Well, I plug it in .. Then test, slowly increase tension I am glad to use this bulb load No effort can be made I made this in parallel, so all that's left is … Turn on the switch, to increase the load Well, great isn't it! We hope you understand And you are slowly increasing the voltage to the current you want But in experiments, when using a heatsink like this The maximum current on the TR3055 does not reach 4A I have tried, if given 4A.
Tr will break up due to heat So to load 5A, you have to use heatsink like this You proved it, in the previous video This heatsink is capable of 6A, without a fan Well, that's all my practices. We hope everyone understands With respect to current and voltage. You can design it yourself If anyone wants to ask, you guys just comment. I definitely answer thanks for your visit.