[Recommended] Self-load stability of DC stabilized power supply
Release time: 2019-08-23
Today we will bring you the self-load stability of DC stabilized power supply. We hope that through our introduction, you will have a deeper understanding of issues such as Shijiazhuang Shuying Instrument Co., Ltd.
This refers to the relative change in the output voltage caused when the output current changes between the rated value I and zero due to changes in the load while all other influences remain the same. The symbol of load stability is sl. From the definition, it can be known that the second section of the voltage stabilization principle is a basic voltage stabilization circuit used to explain the working principle of the linear regulated transistor DC stabilized power supply. El is the electromotive force of the rectifier filter circuit. RI is the equivalent internal resistance of the rectifier filter circuit. U is the unstabilized input voltage. U2 is the output stable voltage. I is the output current. RL is the external load. Magnetic is the overcurrent protection circuit. BG is the adjusting tube, BG2 is the amplifying tube, D is the reference voltage stabilizing tube, and R and R2 are sampling resistors. Such a regulated power supply in which an adjustment stage is connected in series with a load is called a series regulated power supply. Its adjustment function is continuous, so it is also called linear regulated power supply. The adjustment effect is obtained by using the principle of negative feedback: resistors R and R2. The voltage divider is used to take out a part of the fluctuation of the output voltage U and add it to the base stage of the amplifier BG. Therefore, R and R2 support The circuit is called a sampling circuit. The voltage U obtained from R is called the sampling voltage. In order to ensure that the sampling voltage only reflects the change of U, and is not affected by the BG base current 1, the current I8 through R and R2 should be much larger than 1HZ in the design. A circuit composed of a silicon zener diode Df and a current limiting resistor R is used to provide a reference voltage, which is equal to the stable voltage Ur of the zener diode D, and is added to the emitter of the amplifier BG. BG plays the role of comparing the sampling voltage Ub and the reference voltage Uz and amplifying the difference. Therefore, the difference UAB called the error amplifier U and Uz is called the error voltage, and UAB = UR is the load resistance of the error amplifier. The control current output from the BG is added to the base of the regulating tube BG to control the base current of the BG direct current, and the self-load stability of the DC stabilized power supply achieves an adjustment function that maintains the output voltage approximately constant.
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