Under normal circumstances, it is difficult to find a standard positive and negative high voltage DC power supply . Even the voltage of the batteries we use is positive. It would be very difficult to find a negative high voltage DC power supply. However, we often need to use positive and negative high voltage DC power supplies. At this time, we need to find a way to obtain a positive and negative high voltage DC power supply. Today, I will teach you a very simple method to easily make a positive and negative 5V regulated high voltage DC power supply.
Let's first look at the schematic diagram (swap the numbers 1 and 2 on the 7905 chip; it's not changed in the schematic, but the circuit works, so don't worry). This will teach you the simplest way to make a ±5V regulated high-voltage DC power supply.
Schematic diagram of positive and negative regulated high voltage DC power supply
As shown in the diagram above, this positive and negative regulated high-voltage DC power supply uses three-terminal regulators 7805 and 7905, two 0.1uf capacitors, and two 0.33uf capacitors. These components are not many. The input voltage of the high-voltage DC power supply is best between 7-10V, but it is also fine to use a 12V high-voltage DC power supply.
We'll focus on the three-terminal voltage regulators 7805 and 7905. These are two opposing voltage regulators. The former, 7805, is a voltage regulator that stabilizes at +5V, while the latter, 7905, is a voltage regulator that stabilizes at -5V. By combining these two, we can design a voltage regulator that stabilizes at +5V and -5V.
The output current of our voltage regulator is approximately below 1.5A, so the maximum power of our regulated high-voltage DC power supply is 7.5W, which is sufficient for most users. If you require a larger current, you can increase the output current by adding a transistor. Those who wish to expand the range can do so.
In the schematic diagram, we can see that the three-terminal regulator has three pins, which I have also numbered. If you don't understand, you can refer to the schematic diagram below to find the corresponding pins.
When we explain, we also give you a general template. For example, in this circuit, we have completed the design of a ±5V high-voltage DC power supply. If you want to design a 12V high-voltage DC power supply, this circuit is also possible. We just need to replace the three-terminal regulator. For a 12V high-voltage DC power supply, we can use 7812 and 7912. Just replace the two regulators in the diagram.
Of course, it's not limited to these two types. There are many models in the 78 and 79 series. We can choose according to our needs, but remember that the input voltage must be greater than or equal to 2V compared to the output voltage.
Disclaimer: This article is a reprint. If it involves copyright issues, please contact us promptly for deletion (QQ: 2737591964). We apologize for any inconvenience.
