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What are the classifications of switching power supplies? What are the control principles?switching

source:power supply     Popular:adapter     release time:2021-09-14 11:30:48     Article author:sznbone    

  What are the classifications of switching power supplies? What are the control principles?

  Switching power supply classification:

  1. According to the technology, the connection method of the switching tube, and the power supply technology, the switching power supply can be divided into series switching power supply and parallel switching power supply. The switch tube of the series switching power supply is connected in series between the input voltage and the output load, which is a step-down regulator circuit; while the switching tube of the parallel switching power supply is connected in parallel between the input voltage and the output load, similar to redundancy The power supply is a step-up regulator circuit.

  2. According to the excitation mode, the switching power supply can be divided into self-excitation and other excitation. In the self-excited switching power supply, the switch tube and the high-frequency transformer form a positive feedback loop to complete the self-excited oscillation, which is similar to the intermittent oscillator; and the other-excited switching power supply must add an oscillator, the switch generated by the oscillator The pulse is applied to the switching tube to control the on and off of the switching tube, so that the switching circuit works and has a DC voltage output.

What are the classifications of switching power supplies? What are the control principles?switching (图1)

  3. According to the modulation method, switching power supplies like server power supplies can be divided into pulse width modulation (PWM) and pulse frequency modulation (PFM) methods. PWM is a way to control the output voltage stability by changing the switching pulse width, while PFM is when the output voltage changes, through sampling and comparison, the error value is amplified and then the switching pulse period (ie frequency) is controlled to stabilize the output voltage.

  4. According to the output DC value, the switching power supply can be divided into step-up switching power supply and step-down switching power supply, as well as high-voltage switching power supply and low-voltage switching power supply.

  5. According to the output waveform, the switching power supply can be divided into rectangular wave and sine wave circuits.

  6. According to the output performance, the switching power supply can be divided into constant voltage and constant frequency and variable voltage and frequency conversion circuits.

  7. Switching power supplies can be divided into single-ended, push-pull, half-bridge and full-bridge according to the number of switching tubes and the connection mode. The single-ended type uses only one switch tube, the push-pull type and half-bridge type use two switch tubes, and the full-bridge type uses four switch tubes.

  8. The switching power supply can be divided into forward and flyback according to the energy transfer mode.

  9. According to the soft switching method, the switching power supply has current resonance type, voltage resonance type, E type and quasi E type resonance type and partial resonance type.

  There are three control principles of switching power supply:

  The first one is a constant switching cycle at the end of the pulse width adjustment, and the empty ratio is changed by changing the pulse width;

  The second is the pulse frequency adjustment, the on-pulse width is constant, and the duty cycle is changed by changing the switching frequency;

  The third method is to mix and adjust the conduction pulse width and the switching operating frequency, both of which are not fixed, and both can be changed. It is a mixture of the above two methods.

  The classification and control principle of switching power supply have been introduced here. I hope that everyone can successfully purchase a suitable switching power supply after understanding this!


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