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Auto-excitation type Buck-Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor)

A converter, self-excited technology, used in output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve the problem of low efficiency of Buck-Boost converters, and achieve high efficiency and circuit structure. simple effect

Active Publication Date: 2014-06-11
海宁市黄湾镇资产经营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the insufficient efficiency of the BJT-based self-excited Buck-Boost converter and the deficiency that it is only suitable for small power, the present invention provides a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) based on MOSFET (Metal Oxide Semiconductor Field Effect Transistor) with higher efficiency and wider applicable power range ) self-excited Buck-Boost converter

Method used

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  • Auto-excitation type Buck-Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor)
  • Auto-excitation type Buck-Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor)
  • Auto-excitation type Buck-Boost converter based on MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor)

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Experimental program
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Effect test

Embodiment 1

[0023] refer to figure 2 , Figure 4 and Figure 5, a MOSFET-based self-excited Buck-Boost converter, including the Buck-Boost converter main loop composed of input capacitor Ci, N-type MOSFET M1, inductor L, diode D and capacitor Co, the input capacitor Ci and DC voltage The source Vi is connected in parallel, the voltage across the output capacitor Co is the DC output voltage Vo, the load Ro is connected in parallel with the output capacitor Co, the negative terminal of the DC voltage source Vi is connected to the positive terminal of the DC output voltage Vo, and the positive terminal of the DC voltage source Vi is connected to the N The drain of the N-type MOSFET M1 is connected, the source of the N-type MOSFET M1 is connected to one end of the inductor L and the cathode of the diode D, the other end of the inductor L is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the DC voltage source Vi The negative terminal is connect...

Embodiment 2

[0030] refer to image 3 , Figure 4 and Figure 6 , the present embodiment also includes a current feedback branch, the current feedback branch includes a detection resistor R9, a voltage amplifier U4, a resistor R8, a capacitor C3, a resistor R7, an NPN type BJT Q3, a resistor R6, and a PNP type BJT Q1, and the detection resistor R9 and the load Ro form a series branch, the series branch is connected in parallel with the output capacitor Co, one end of the detection resistor R9 is connected to the negative end of the DC voltage source Vi, the other end of the detection resistor R9 is connected to one end of the load Ro and the voltage amplifier U4 connected to the input of the resistor R8 and the capacitor C3 to form a parallel branch, one end of the parallel branch is connected to the output of the voltage amplifier U4, and the other end of the parallel branch is connected to one end of the resistor R7 and the NPN type BJT Q3 The base is connected, the emitter of the NPN ...

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Abstract

The invention provides an auto-excitation type Buck-Boost converter based on an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor). The auto-excitation type Buck-Boost converter based on the MOSFET comprises a Buck-Boost converter main circuit and an auxiliary power supply U1, wherein the Buck-Boost converter main circuit is formed by an input capacitor C1, an N-type MOSFET M1, an inductor L, a diode D and a capacitor Co. A single MOSFET basic auto-excitation unit circuit applied in a Buck-Boost converter is formed by the N-type MOSFET M1, a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1, a hysteresis comparator U3 and a driving circuit U2. The auto-excitation type Buck-Boost converter based on the MOSFET provided by the invention has high efficiency and a wider use power range.

Description

technical field [0001] The invention relates to a self-excited direct current-direct current (DC-DC) converter, which is applied to a switching or current-stabilizing power supply, a high-brightness LED drive circuit, etc., in particular to a self-excited Buck-Boost converter. Background technique [0002] Compared with linear (stabilized voltage or steady current) regulators and other excited DC-DC converters, self-excited DC-DC converters have significant advantages of high cost performance. figure 1 Given is a self-excited Buck-Boost converter based on BJT (bipolar transistor), including Buck-Boost conversion composed of input capacitor Ci, PNP type BJT Q1, inductor L, diode D and output capacitor Co The main circuit of the device, the input capacitor Ci is connected in parallel with the DC voltage source Vi, the voltage across the output capacitor Co is the DC output voltage Vo, the load Ro is connected in parallel with the output capacitor Co, the negative terminal of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/137
Inventor 陈怡南余荣
Owner 海宁市黄湾镇资产经营有限公司