9 Classification Methods For Switching Power Supplies
Aug 13, 2018| (1) According to the technology, the connection mode of the switch tube and the power supply technology, the switching power supply can be divided into a series switching power supply and a parallel switching power supply. The switching tube of the series switching power supply is connected in series between the input voltage and the output load, and belongs to the buck regulator circuit; and the switching tube of the parallel switching power supply is connected in parallel between the input voltage and the output load, similar to redundancy. A power supply such as a boost regulator circuit.
(2) According to the incentive mode, the switching power supply can be divided into self-excited and other excited. In the self-excited switching power supply, the positive feedback loop is formed by the switching tube and the transformer technology '> high-frequency transformer to complete the self-oscillation, similar to the intermittent oscillator; and the other switching power supply must be attached with an oscillator to oscillate. The switching pulse generated by the device is applied to the switch tube to control the on and off of the switch tube, so that the switch circuit operates and has a DC voltage output.
(3) According to the modulation method, the switching power supply like the server power supply can be divided into pulse width modulation (PWM) mode and pulse frequency modulation (PFM) mode. PWM is a way to control the output voltage stability by changing the switching pulse width. When the output voltage changes, the PFM is used to control the switching pulse period (ie, frequency) by sampling and comparing the error value to stabilize the output voltage.
(4) According to the output DC value, the switching power supply can be divided into a step-up switching power supply and a step-down switching power supply, and can also be divided into a high-voltage switching technology '> a high-voltage switching power supply and a low-voltage switching power supply.
(5) According to the output waveform, the switching power supply can be divided into a rectangular wave and a sine wave circuit.
(6) According to the output performance, the switching power supply can be divided into constant voltage constant frequency and variable voltage frequency conversion circuits.
(7) According to the number of switching tubes and the connection method, the switching power supply can be divided into single-ended, push-pull, half-bridge and full-bridge. The single-ended type uses only one switching tube, the push-pull type and the half-bridge type use two switching tubes, and the full-bridge type uses four switching tubes.
(8) Switching power supply can be divided into forward excitation and flyback according to 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.