Detailed explanation of the five characteristics of regulated power supply
1. Low power consumption and high efficiency. In the switch regulated power supply circuit, transistor V is excited by the excitation signal and works alternately in the on off and off on switching states. The conversion speed is fast, and the frequency is generally around 50kHz. In some technologically advanced countries, it can reach several hundred or nearly 1000kHz. This reduces the power consumption of switch transistor V, greatly improves the efficiency of the power supply, and can reach 80% efficiency
2. Small size and light weight. From the schematic diagram of the switch regulated power supply, it is clear that there is no bulky power frequency transformer used here. Due to the significant reduction in dissipated power on the adjustment tube V, larger heat dissipation fins are also eliminated. Due to these two reasons, the switch regulated power supply has a small volume and light weight.
3. Wide voltage stabilization range. The output voltage of the switch regulated power supply is adjusted by the duty cycle of the excitation signal, and the changes in the input signal voltage can be compensated through frequency modulation or width modulation. This way, when the power frequency grid voltage changes significantly, it can still ensure a relatively stable output voltage. So the voltage stabilization range of the switching power supply is very wide, and the voltage stabilization effect is very good. In addition, there are two methods for changing the duty cycle: pulse width modulation and frequency modulation. In this way, the switch regulated power supply not only has the advantage of a wide range of voltage regulation, but also has many methods to achieve voltage regulation. Designers can flexibly choose various types of switch regulated power supplies according to the requirements of practical applications.
4. The efficiency of filtering is greatly improved, resulting in a significant reduction in the capacity and volume of the filtering capacitor. The working frequency of switch regulated power supply is currently basically working at 50kHz, which is 1000 times that of linear regulated power supply, which improves the filtering efficiency after rectification by almost 1000 times. By using half wave rectification followed by capacitor filtering, the efficiency has also been improved by 500b times. When using a switch regulated power supply with the same ripple output voltage, the capacity of the filter capacitor is only 1/500-1/1000 of that of the filter capacitor in a linear regulated power supply
5. Flexible and diverse circuit forms. For example, there are self excitation and self excitation, width modulation and frequency modulation, single ended and double ended, and so on. Designers can leverage the strengths of various types of circuits to design switch regulated power supplies that can meet different application scenarios.
