The DC stabilized power supply is the energy source for the laboratory to supply experimental electronic circuits, and plays an important role in the experimental process. The quality of the power supply also determines the reliability of the experimental circuit and various technical indicators to a certain extent. Of the many types of power supplies, DC regulated power supplies are the most widely used category. First, the classification of DC stabilized power supply Due to the wide variety of DC stabilized power supplies, the working principle is quite different and can be classified from different angles. According to the voltage regulation mode of the circuit, it can be divided into a parameter regulator and a feedback adjustment regulator. The parameter regulator circuit has a simple structure and mainly uses the nonlinearity of the components to achieve voltage regulation. A parametric regulator can be constructed using a resistor and a Zener diode; the feedback regulated regulator is a closed loop negative feedback system that utilizes changes in the output voltage. After sampling, comparing, and amplifying, the control voltage is obtained, and the corresponding adjusting components are controlled to achieve the final stable output voltage. According to the working state of the adjusting component in the circuit, it can be divided into a linear regulator circuit and a switching regulator circuit. The adjusting component works in the linear amplification area, which is called a linear voltage regulator circuit; if the adjusting component works in the switching state, it is called a switching regulator circuit. In addition, it can be divided into an integrated linear regulator, an integrated switching regulator, and a voltage regulator composed of discrete components, depending on whether the main components in the power supply are integrated circuits or discrete components. Second, linear regulated power supply The linear regulated power supply used in the laboratory generally has two or more outputs. The output DC voltage is continuously adjustable from 0 to 30V. The output current is several amps. The voltage and current values ​​are displayed by the meter or digital. It has the characteristics of high stability and small ripple. The power supply regulating tube of the voltage regulator in the linear power supply works in the linear region. To ensure the voltage regulation characteristics of the power supply, the input and output on the regulating tube must have sufficient voltage difference. In order to ensure the power supply index, the grid voltage is generally allowed to fluctuate by ±10%. In the linear power supply, the input power supply is subjected to transformer, rectification, and filtering, and the pulsation of the DC voltage is small. After the linear regulator circuit, the output ripple The voltage and noise are very small, making them ideal for powering a variety of low noise amplifiers. Third, the basic principle of linear DC power supply The linear DC regulated power supply generally converts the AC voltage of 50Hz and 220V into an AC voltage of the required amplitude, and then the AC voltage is converted into a DC ripple voltage by the rectifier circuit, and then the DC voltage is smoothed by the filter circuit. Finally, a stable voltage is output through the DC voltage regulator circuit. It maintains a stable DC voltage in the event of grid fluctuations and load changes. Commonly used rectification and filtering circuits are: half-wave rectification capacitor filter circuit, full-wave rectification capacitor filter circuit and bridge rectification capacitor filter circuit. There are many types of voltage regulator circuits, such as silicon regulator tube regulator circuit, series transistor regulator circuit and integrated voltage regulator circuit. 10KW-200KW Three-Phase Inverter
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