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Switching converter and control method thereof

A technology of switching converters and switching tubes, which is used in control/regulation systems, conversion of DC power input to DC power output, instruments, etc. It can solve the problem of large Q2 driving loss of MOS tube, low comprehensive efficiency in the full load range, and narrow pulse driving. Difficult to issue, etc., to achieve the effect of high overall efficiency and small negative current

Active Publication Date: 2019-11-26
MORNSUN GUANGZHOU SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the technical defects of the existing step-down circuit and its improved patented circuit and control method, the present invention proposes a switching converter and its control method, which solves the problem of low overall efficiency of the step-down circuit in a wide voltage input range and full load range. He patent "Control Method and Device for Improving Light Load Efficiency of Synchronous Step-Down Converter" has a large driving loss of MOS transistor Q2, and the high-frequency resonance of the drain of MOS transistor Q2 from t3 to t4 leads to EMI and narrow pulse drive from t4 to t5 difficult question

Method used

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  • Switching converter and control method thereof

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no. 1 example

[0050] Figure 5 It is the schematic circuit diagram of the first embodiment of the present invention. Including input power supply positive Vin, output voltage positive Vo, power supply common ground, MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, diode D1, inductor L1 and capacitor C1; the drain of MOS transistor Q1 is connected to the input power supply positive Vin , the source of MOS transistor Q1 and the drain of MOS transistor Q2 are connected to one end of inductor L1, the source of MOS transistor Q3 and the cathode of diode D1 are connected to the other end of inductor L1, and the drain of MOS transistor Q3 is connected to One end of the capacitor C1, the source of the MOS transistor Q2, the anode of the diode D1 and the other end of the capacitor C1 are connected to the common power ground GND.

[0051] Figure 5 Coss1, Coss2 and Coss3 are the output capacitances of MOS transistor Q1, MOS transistor Q2 and MOS transistor Q3 respectively. In addition, Fi...

no. 2 example

[0069] Figure 7 It is the schematic circuit diagram of the second embodiment of the present invention, on the basis of the first embodiment, the diode D1 is removed, and other connection relations remain unchanged.

[0070] Figure 8 Shown is the working sequence of the second embodiment, specifically as follows:

[0071] t0~t1 stage: At the moment t0, the MOS transistor Q1 is turned on, the voltage across the inductor L1 is Vin-Vo, which excites the inductor L1, and the current i of the inductor L1 L Rising, turn off the MOS transistor Q1 at time t1;

[0072] Stage t1~t2: After the MOS transistor Q1 is turned off, the current i of the inductor L1 L Charge the output capacitor Coss1 of the MOS transistor Q1, and discharge the output capacitor Coss2 of the MOS transistor Q2. At the time t2, the voltage of SW1 at the end of the inductor L1 is reduced from Vin to 0V, and the MOS transistor Q2 realizes ZVS opening;

[0073] Stage t2~t3: the voltage across the inductor L1 is V...

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Abstract

The invention discloses a switching converter and a control method thereof. The switching converter comprises an input power positive electrode, an output voltage positive electrode, a power common ground, a switching tube Q1, a switching tube Q2, a switching tube Q3, a diode D1, an inductor L1 and a capacitor C1; a drain electrode of the switching tube Q1 is connected to the input power positive;a source electrode of the switching tube Q1 and a drain electrode of the switching tube Q2 are connected to one end of the inductor L1; a source electrode of the switching tube Q3 and a negative electrode of the diode D1 are connected to the other end of the inductor L1; a drain electrode of the switching tube Q3 is connected to one end of the capacitor C1; and a source electrode of the switchingtube Q2, a positive electrode of the diode D1 and the other end of the capacitor C1 are connected to the power common ground. According to the switching converter provided by the invention, the problem of low comprehensive efficiency of a step-down circuit working in a wide input voltage and a load range is solved, and meanwhile, oscillation is eliminated and EMI is improved.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a switching converter circuit and a control method thereof. Background technique [0002] figure 1 It is a traditional step-down circuit, the effective value of the current is relatively large when the circuit works in discontinuous mode, the MOS transistor Q1 is a hard switch, and the conduction loss of the diode D1 is large. [0003] figure 2 It is a step-down circuit with synchronous rectification function. Compared with the traditional step-down circuit, it reduces the conduction loss in the freewheeling stage. In FCCM mode, it can also realize the ZVS turn-on of MOS transistor Q1. Due to the ZVS turn-on and high The range of efficiency work is relatively narrow, so there is a problem of low overall efficiency in the wide voltage input range and full load range. [0004] image 3 It is the accompanying drawing of the patent abstract of Taiwan, China, whose application number i...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 卢鹏飞
Owner MORNSUN GUANGZHOU SCI & TECH
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