The working principle and common problems of adjustable DC regulated power supply
The adjustable DC stabilized power supply adjusts its own voltage level according to the voltage required by various electrical appliances when they are working, so that the electrical appliances can meet the use, because it has protection safety functions, overvoltage, and overcurrent points can be set continuously and It can be previewed, and at the same time, it can be controlled and debugged according to the contact switch. At present, the adjustable DC regulated power supply is widely used.
What is an adjustable DC regulated power supply?
The adjustable DC power supply adopts the international advanced high-frequency modulation technology. Its working principle is to expand the voltage and current capacity of the switching power supply to provide a wide range of voltage and current regulation, while expanding the application range of the current DC power supply. The control chip [1] of the DC regulated power supply currently uses relatively mature imported parts, while the power supply parts use the latest high-power equipment developed in the world. The adjustable DC stabilized power supply design eliminates the bulkiness of traditional DC power supplies with industrial frequency transformers. Compared with traditional power supplies, high-frequency DC power supplies have the advantages of smaller size, lighter weight and higher efficiency. At the same time, the adjustable DC stabilized power supply can reduce the capacity volume. This power supply is also known as a high frequency adjustable switching power supply.
The working principle of the adjustable DC regulated power supply:
After being rectified and filtered by diodes, the AC power passes through high and medium power transistors, which conduct output power through resistors. Depending on the design of the capacitor, a series resistor can be used to power the zener diode until the voltage stabilizes, so that a stable voltage difference is maintained across the diode's poles. Other designs follow the transistor output. This stable voltage is called the reference voltage.
Then use a triode or integrated block as a comparator. (+output) is connected to the reference voltage at one end, the other end (b) is connected to the current limiting resistor, which is connected to the central adjustable part of the adjustable resistor, and the two adjustable pins at the other end are connected to the two output voltage pins. pole. ..some poles are connected to the b poles of the high and medium power transistors to control and regulate the conduction of the transistors. You can adjust the voltage by adjusting the adjustable resistor.
In short, the principle is to compare the output voltage with the reference voltage through the comparison tube (manifold), and control the conduction current and voltage of the large and medium power transistors to achieve the purpose of voltage regulation. conduction.
Can high-power DC power supply charge mobile phones and electric vehicles?
According to this principle, as long as the stable DC power supply is a constant voltage source and the output voltage of 5261 is relatively stable, the electrical voltage of 4102 will be unstable, such as voltage rise (voltage drop is ignored), and there is no problem with using a stable DC power supply , I've done this so I can use DC power to charge my phone! As long as the output from the stable power supply is stable enough it shouldn't be a concern. Cell phone chargers are usually 5V, so you can adjust to 5V! As a safety measure, you must avoid combustibles and explosives when charging! (If the stable voltage has overvoltage protection, it is best to set the power supply overvoltage protection value to 5.5v ).
For lead storage batteries, the charging voltage is set according to the 2.3-2.5V voltage of each battery. That is to say, the 12V battery has 6 batteries, the charging voltage is set to 13.8 to 15.0V, and it is charged with a constant voltage method.
Reasons for overheating in high-power power supplies:
High-power FETs can be used as control tubes for high-power adjustable power supplies. Precautions for use: If there is a potentiometer on the grid, an electrolytic capacitor or resistor as small as possible should be added to prevent poor contact of the potentiometer. Hanging will generate static electricity.
The thyristor cannot be used as a control tube of a high-power adjustable power supply, but it can be used as a rectifying pulsating DC adjustable component to adjust the power of a purely resistive load (mainly the thyristor has the function of turning on and off, it will not turn off, but the pulsating DC can reset itself to zero).
