Switch converter and control method thereof

A technology of switching converters and control methods, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve the trade-off between large current output and high-efficiency work, small Q1ton time of MOS tube, MOS The problem of long and difficult freewheeling time of tube Q2 can achieve the effect of shortening freewheeling time, reducing conduction loss and improving efficiency.

Active Publication Date: 2019-07-12
MORNSUN GUANGZHOU SCI & TECH
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  • Claims
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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 to solve the problem that the current effective value of the step-down circuit is large when the step-down circuit works in discontinuous m

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  • Switch converter and control method thereof

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no. 1 example

[0062] Figure 4 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, 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.

[0063] Figure 4 Coss1, Coss2, Coss3 and Coss4 are the output capacitances of MOS...

no. 2 example

[0097] Figure 8 It is the schematic circuit diagram of the second embodiment of the present invention. On the basis of the first embodiment, the MOS transistor Q3 is replaced by a diode D1, the cathode of the diode D1 is connected to the drain of the MOS transistor Q1 and the positive input power Vin, and the anode of the diode D1 is connected to the drain of the MOS transistor Q4 and the inductance the other end of L1.

[0098] 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.

[0099] In this embodiment, the ratio of the input-output voltage to greater than 3 can also achieve a better implementation effect. For a switching converter with a Vin voltage of 380V, a Vo voltage of 48V, an inductor L1 of 1uH, and an output current of 20A,...

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Abstract

The invention discloses a switch converter and a control method thereof. The switch converter comprises a positive input power source, a positive output voltage source, a power source common ground, switch tubes Q1 to Q4, an inductor L1 and a capacitor C1, the drain of the switch tube Q1 and the drain of the switch tube Q3 are connected to the positive input power source, the source of the switchtube Q1 and the drain of the switch tube Q2 are connected to one end of the inductor L1, the source of the switch tube Q3 and the drain of the switch tube Q4 are connected to the other end of the inductor L1, the source of the switch tube Q4 is connected to one end of the capacitor C1, and the source of the switch tube Q2 and the other end of the capacitor C1 are connected to the power source common ground. The inductor L1 can be rapidly demagnetized under a relatively high ratio of input voltage to output voltage, current waveform of the inductor L1 is converted from triangular into quadrangular, and high-efficiency high-frequency work of the switch converter is realized.

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 the MOS transistor Q1, because the ZVS turn-on of the MOS transistor Q1 and The range of high-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 drawing of the abstract of the US patent with the applicat...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0048Y02B70/10
Inventor 卢鹏飞
Owner MORNSUN GUANGZHOU SCI & TECH
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