[Picture] What is the self-load stability of a DC stabilized power supply?
Release time: 2019-08-16
The development of many industries in life is inseparable from the DC stabilized power supply . Sometimes some industries have their own brands in the field. Today I will introduce you to Shijiazhuang Shuying Instrument Co., Ltd.
A DC power supply is a device that maintains a constant current in the circuit. Such as dry batteries, storage batteries, DC generators, etc.
The DC power supply has two positive and negative electrodes. The potential of the positive electrode is high and the potential of the negative electrode is low. When the two electrodes are connected to the circuit, a constant potential difference can be maintained between the two ends of the circuit, thereby forming a positive electrode to an external circuit. Negative current.
The difference in water level alone cannot maintain a stable water flow, and the constant water level can be maintained by forming a stable water flow with the help of a pump that continuously sends water from a low place to a high place. Similarly, the electrostatic field generated by the charge alone cannot maintain a stable current. With the help of a DC power supply, non-static action (referred to as "non-static force") can be used to make the positive charge from the negative electrode with a lower potential. The power source returns to the positive electrode with a higher potential to maintain the potential difference between the two electrodes, thereby forming a stable current. Therefore, a DC power supply is an energy conversion device that converts other forms of energy into electrical energy supply circuits to maintain a steady flow of current.
The main uses are:
1. Sophisticated electrolytic capacitors, empowered by tantalum capacitors;
2, sophisticated electronic components such as resistors, relays, motors, routine tests;
3. Laboratory, electronic equipment, automatic test equipment;
4. Electronic inspection equipment, production line equipment, communication equipment;
5. All other occasions where DC power is needed.
DC stabilized power supply brings convenience to life, making life more convenient and faster! With the stability of DC stabilized power, the function of DC stabilized power knows how much life is unimpeded.
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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 pass transistor BG to control the base current of the BG, so as to achieve an adjustment effect of maintaining the output voltage to be approximately constant.The above points are related to the "self-load stability of DC stabilized power supply". I believe that after reading the introduction of this article, I will have my own understanding of this aspect. In the future, I can also solve problems such as DC stabilized power supply. Good solution. Here, we recommend that you know more about DC stabilized power supplies, Shijiazhuang Shuying Instrument Co., Ltd. and other relevant information, and hope to help you!