What is the working principle of a DC-DC converter?

The DC-DC converter is one of the important power supply devices. In this article, we will talk about the classification of power supply and the working principle of the DC-DC converter.

Here is the content list:

• What is the classification of the power supply?

• What is the working principle of a DC-DC converter?

What is the classification of the power supply?

The power supply is a specific device that converts other forms of electricity into power. There are ordinary power supplies and special power supplies. The ordinary power supply is subdivided into switching power supply, inverter power supply, AC voltage regulator, DC voltage regulator, DC-DC power supply, module power supply, inverter power supply, UPS power supply, EPS emergency power supply, PC power supply, rectifier power supply and so on. Among them, switching power supply is the most common one. The working principle of switching power supply is essential to change the output voltage or current by changing the on-time of the regulator tube in the circuit, to maintain the output voltage or current stability. In the AC-DC power conversion, utility power is rectified into high-voltage DC-DC, and then converted into low-voltage DC-DC required by the load through DC-DC, so DC-DC converter is the core of the components of the switching power supply, so DC-DC switching power supply is also known as a DC-DC converter.

What is the working principle of a DC-DC converter?

The DC-DC converter is the most common type of switching power supply, consisting of diodes, transistors, capacitors, etc. The DC-DC converter is a repeated on-off switch to convert DC voltage or current into high-frequency square wave voltage or current, and then smoothly changed into DC voltage output by rectification. DC-DC converter roommate semiconductor switch, rectifier diode, smooth filter reactor, and capacitors, and other basic components. When electrical isolation is required between the input and output, a transformer can be used to transfer the high-frequency square wave voltage to the output side through the transformer.

By increasing the switching frequency, magnetic devices such as filter inductors and switching transformers, as well as filter capacitors, can be small and lightweight. For DC-DC converters, the waveform of the voltage US added to both sides of the switch S is approximately a square wave, while the waveform through the current IS is approximately a triangular wave or a triangular wave with steps. Its duty cycle is defined in the equation, T is the switch, S on/off period; TON is the switch S on time; TOFF is the switch S off time.

The switching waveform of the DC-DC converter controls the duty cycle by keeping the operating cycle T constant, pulse width modulation PWM that controls the switch on/off time, and frequency modulation (PWM) that keeps the on-time TON constant and changes the operating cycle T. However, when the switching frequency is low, the frequency-modulated PFM method requires a large isolation transformer with an input/output filter, which is not economical and makes it too large to be accepted in reality, so the switching frequency of this operating method should be high enough.

The working principle of the DC-DC converter makes it unique in its role and use. In more than a decade of power supply and sensor research and development. We always adhere to the purpose of "customer first, the brand first, technology to improve life" and the commitment of "quality, integrity, the best service, the latest technology", committed to wholehearted service, provide quality products, to meet the needs of diverse customers, to meet the Diversified market demand. If you have relevant needs, welcome to visit our official website:https://www.smunchina.com. for consultation and understanding. Thank you very much for your support.