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The working principle of the DC-DC converter

wallpapers Tech 2021-04-29
In the design process of module power supply, if engineers can make reasonable use of the working principle knowledge and performance characteristics of a DC-DC converter for product research and development, not only can improve efficiency, but also can effectively save test time and speed up the launch of new products.
In fact, we are familiar with the DC-DC converter in the actual application process, which is often called the switching regulator, this important component has the advantages of high efficiency, small static current, so it can be seen in different fields. Generally speaking, a basic DC-DC converter consists of a control chip, inductor coil, thyristor, transistor, and various types of capacitors.
Now that you understand the infrastructure of a DC-DC converter, let's take a look at how it normally works. As a conversion device, in the usual work, the main work of DC-DC converter in the circuit system, is the transmission of direct current in the circuit first inverter (to perform the boost or buck work), so that it becomes an alternating current, and then rectified into another DC voltage. The commonly-used DC-DC converter is generally composed of a DC-DC conversion module, monitoring module and supporting user interface board and DC distribution unit, etc. In this working system, a number of DC-DC conversion modules run in parallel and share the load evenly. The 48V DC voltage is converted into 24V(or +12V, +5V) DC voltage, and then output to the load through the output branch safety. The monitoring module is responsible for monitoring the working state and performance of the converter module and the whole system, and it is incorporated into the upper-level monitoring system through the RS232 communication port. In the process of DC voltage conversion, the converter module of the DC-DC converter will convert 48V DC voltage to 24V DC voltage. The conversion work is completed by the power circuit and the control circuit. The power circuit provides the conversion operation from the DC input to the DC output, and the control circuit will provide all the control signals needed for the power conversion, including the feedback loop, DC signal processing, analog and switching processing circuits, etc.
Through the above introduction, we can summarize the complete working process of a DC-DC converter for voltage conversion as follows: First, the output voltage is connected to the FBPIN sampling amplifier through the FB feedback circuit. At this point, the feedback voltage VFB is compared with the set comparison voltage VCOMP, and the error voltage signal is generated at the same time. The error voltage signal will be input to the PWM module through the internal circuit of the converter, and then the PWM will adjust the duty cycle according to the size of the error voltage, so as to achieve the purpose of regulating the output voltage.

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