Multi-purpose high voltage DC adjustable regulated power supply
Design Features
It is extremely rare to have a stable voltage power supply that starts from zero volts and reaches hundreds of volts in molded products. However, some physical experiments require this kind of power supply. It can not only provide power for various electronic equipment, but also provide power for color monitors, color TVs and The commissioning and maintenance of computer monitors are safe and handy
The technical indicators of this power supply can meet the requirements for the use of mid-range and above instruments and equipment. The DC voltage is continuously adjustable from , the output current can reach , the output impedance is less than , the ripple is less than , and it has a reliable short-circuit protection function.
working principle
The triple-shielded power transformer minimizes the noise from the power grid, and the secondary winding supplies power to the main power supply, which supplies power to the three-terminal adjustable integrated voltage regulator circuit, so that the power supply can be adjusted from zero volts to rectify the main power supply The filtered DC voltage is connected to the input terminal of the adjustment tube to form a power indicator circuit. Choose a red light-emitting diode rectifier tube or use an imported small-volume electrolytic capacitor for the power supply filter capacitor. The main components of the circuit are imported. Be careful not to use defective products. The components are the high-voltage range adjustment potentiometer, the output voltage adjustment potentiometer, and the current-limiting resistor. When the output terminal is short-circuited, it will limit the large current from entering, thereby further protecting it. Although it has self-protection internals for overheating, overvoltage, and overcurrent In order to maintain a very small load current, the circuit is connected in series between the output terminal and the base to improve the voltage stabilization performance. The over-current protection circuit of the tube, when the voltage drop current generated by the output current exceeds the current, it will be turned on, forcing the switch to be cut off, so as to play the role of current limiting and short-circuit protection. The DC meter is used to indicate the output voltage. The ammeter is used to indicate the output current. Of course, it can be omitted if there is no condition, but the voltmeter cannot be omitted, because it can monitor the voltage output at any time. The voltage stabilization work is completed by a three-terminal integrated voltage regulator. The basic process is that when the output voltage rises, the internal circuit performs a series of high-speed adjustments to make the output voltage drop, and the internal resistance of the junction of the external adjustment tube increases, and the voltage drop changes. Large, the output voltage drops to achieve the purpose of voltage regulation and vice versa.
