The safety, efficiency and quality of the power supply system in the communication base station are increasingly demanding, especially when the old and new communication equipment needs to be replaced and compatible with the old and new communication equipment. It is necessary to use a DC-DC conversion power supply, which is a power conversion device that converts electric energy of one DC voltage value into another DC voltage value in a DC circuit.
The power board of the DC-DC conversion power supply for communication is mainly composed of electronic components such as control chips, inductance coils, diodes, transistors, and capacitors. For the design of DC-DC conversion power supply, it is not only the core control chip, but also the selection of electronic components in other peripheral circuits and the wiring method of the substrate PCB. Reasonable design of the entire electronic circuit can improve The circuit performance of the DC-DC conversion power supply; and this DC-DC power supply has the characteristics of high reliability, easy system upgrade, high conversion efficiency, etc., and compared with the LDO of the linear regulator, it has high conversion efficiency and is the DC-DC conversion The significant advantage of the power supply, the high efficiency can reach more than 95%, reducing the energy consumption of the power supply itself.
The DC-DC conversion power supply for communication has a wide voltage range, and its corresponding voltage modulation method is as follows:
1. PFM (Pulse Frequency Modulation)
When the width of the switching pulse is constant, the output voltage of the DC-DC conversion power supply can be stabilized by changing the frequency of the pulse output; and the PFM control power supply can be used even under the condition of long-term use, especially when powering small-capacity loads. , this DC-DC conversion power supply has the advantage of low power consumption.
2. PWM (Pulse Width Modulation)
When the frequency of the switching pulse is constant, the output voltage of the DC-DC conversion power supply can be stabilized by changing the pulse output width, and the PWM control power supply has high efficiency, and the DC-DC conversion power supply has good output voltage ripple and noise .
Through the above description, the DC-DC conversion power supply adopts two different modulation methods, PFM and PWM, so the performance of the developed and designed DC-DC conversion power supply is also different. According to the specific application scenario, the control method of PFM type and PWM type is selected. Of course, the PWM/PFM conversion type can be used. When the power supply is under light load, PFM control is implemented, and when the power supply is under heavy load, it is automatically switched to PWM control. Therefore, the application of DC-DC conversion power supply modules is becoming more and more extensive, and is widely used in communications equipment, power electronics, military products, instruments and meters, switching equipment and other communication fields, military aerospace and scientific research and other fields.