Switching converter and control method thereof
A technology of switching converters and control methods, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problem of large conduction loss, difficulty in large current output and high frequency, inductor L1 Long demagnetization time and other problems
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no. 1 example
[0064] image 3 It is the schematic circuit diagram of the first embodiment of the present invention. Including input power supply positive Vin, output voltage negative Vo, power supply common ground, MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, inductor L1 and capacitor C1; the drain of MOS transistor Q1 and the drain of MOS transistor Q3 The drain is connected to the positive Vin of the input power supply, the source of the MOS transistor Q1 and the drain of the MOS transistor Q2 are connected to one end of the inductor L1, the source of the MOS transistor Q3 and the drain of the MOS transistor Q4 are connected to the other end of the inductor L1 At one end, the source of the MOS transistor Q4 is connected to one end of the capacitor C1, and the source of the MOS transistor Q2 and the other end of the capacitor C1 are connected to the power common ground GND.
[0065] image 3 Coss1, Coss2, Coss3 and Coss4 are the output capacitances of MOS t...
no. 2 example
[0101] Figure 7 It is the schematic circuit diagram of the second embodiment of the present invention. On the basis of the first embodiment, the MOS transistor Q1 is replaced by a diode D1, the cathode of the diode D1 is connected to the drain of the MOS transistor Q3 and the positive input power Vin, and the anode of the diode D1 is connected to the drain of the MOS transistor Q2 and the inductance one end of L1.
[0102] The time for the diode D1 to flow current is relatively short. Compared with the MOS tube solution, the conduction loss will not increase too much, but it saves a floating drive, reduces the drive loss, simplifies the drive circuit, and is suitable for small and medium current output. Scenes.
[0103] In this embodiment, the absolute value of the ratio of the input-to-output voltage is greater than 2, and a better implementation effect can also be obtained. For a switching converter with a Vin voltage of 75V, a Vo voltage of negative 12V, an inductor L1 o...
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