CRM buck-boost converter controlled by segmented constant conduction time
A buck-boost converter and time control technology, which is applied in the control/regulation system, output power conversion device, DC power input conversion to DC power output, etc., can solve the problem of poor EMI differential mode characteristics and large conduction loss of switching tubes , Inductive current peak value and other problems, to achieve the effect of small conduction loss, reduce inductor current ripple, and reduce current effective value
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[0034] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0035] 1 The working principle of CRM Buck-Buck / Boost PFC converter
[0036] figure 1 It is the main circuit of CRM Buck-Buck / Boost PFC converter.
[0037] Settings: 1. All devices are ideal components; 2. The output voltage ripple is very small compared to its DC value; 3. The switching frequency is much higher than the input voltage frequency.
[0038] figure 2 The waveforms of the switch tube current and inductor current in a switching cycle of the CRM Buck-Buck / Boost PFC converter are given. The figure (a) is the waveform of the Buck converter while the figure (b) is the Buck / Boost converter. Waveform diagram at work. When the input voltage v g Less than the output voltage V o 时,The second switch tube Q b / b When conducting, D fw Cut off, the voltage across the inductor L is v g , Its current i L Start from zero with v g The slope of / L increases ...
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