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Input adaptive auto-excitation type Buck-boost converter

A self-adaptive, converter technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., to achieve the effect of reducing freewheeling conduction loss and small current detection loss

Active Publication Date: 2014-09-10
浙江日风电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a self-excited Buck-boost converter with input adaptive Input Adaptive Self-excited Buck-boost Converter with Current Limiting Protection Capability, Smaller Current Detection Loss and Smaller Freewheeling Conduction Loss

Method used

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  • Input adaptive auto-excitation type Buck-boost converter
  • Input adaptive auto-excitation type Buck-boost converter
  • Input adaptive auto-excitation type Buck-boost converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to image 3 , Embodiment 1 includes a main loop and an input adaptive control circuit for adaptive current limiting protection, and the main loop includes an input capacitor Ci, an inductor L, a PNP type BJT transistor Q2, an output capacitor Co, and is used to drive a PNP type BJT The driving circuit of the tube Q2 and the freewheeling sub-circuit for reducing the freewheeling conduction loss. The drive circuit includes NPN type BJT tube Q3, resistor R2, resistor R4, resistor R5, diode D1, capacitor C4 and diode D3, and the input adaptive control circuit includes NPN type BJT tube Q1, diode D2, resistor R1, resistor R3, capacitor C1 and resistor R6, the freewheeling sub-circuit includes PNP type BJT tube Q5, NPN type BJT tube Q4, resistor R7, resistor R9, resistor R8, resistor R10, capacitor C2 and capacitor C3. The role of diode D3 and capacitor C4 is to improve the switching speed of NPN type BJT tube Q3, the role of capacitor C3 is to improve the switching sp...

Embodiment 2

[0044] refer to Figure 5 , Embodiment 2 On the basis of Embodiment 1, the diode D3 is omitted, and a Zener tube Z is added. The cathode of the Zener tube Z is connected to the base of the NPN type BJT tube Q3, and the anode of the Zener tube Z is connected to the DC voltage source Vi The negative terminal is connected, and the Zener tube Z has the function of widening the working range of the circuit.

[0045] refer to Figure 6 , The working principle of the circuit of embodiment 2 is similar to that of embodiment 1, and also has an input adaptive current limiting function. Within a steady-state working cycle (t21 to t23), the working state of Embodiment 2 in the critical continuous mode of the inductor current iL can be roughly divided into two stages: the t21 to t22 stage and the t22 to t23 stage. The main difference lies in: when the embodiment 2 is in the period from t21 to t22, the base voltage vb3 of Q3 is equal to the reverse conduction voltage drop VZ of the Zener ...

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Abstract

The invention relates to an input adaptive auto-excitation type Buck-boost converter. The input adaptive auto-excitation type Buck-boost converter comprises a main loop and an input adaptive control circuit which is used for adaptive current limit protection; the main loop comprises an input capacitor Ci, an inductor L, a PNP type BJT tube Q2, an output capacitor Co, a drive circuit used for driving the PNP type BJT tube Q2 and a flywheel sub-circuit used for lowering the follow current conduction consumption; the drive circuit comprises an NPN type BJT tube Q3, a resistor R2, a resistor R4, a resistor R5 and a diode D1, and the input adaptive control circuit comprises an NPN type BJT tube Q1, a diode D2, a resistor R1, a resistor R3 and a resistor R6. According to the input adaptive auto-excitation type Buck-boost converter, the input adaptive control circuit controls the current of the inductor L or the collecting electrode current of the PNP type BJT tube Q2 and has a current limit function with the input adaptive characteristic, and moreover, the input adaptive control circuit also realizes smaller current detection consumption; the flywheel sub-circuit enables the follow current conduction consumption of the Buck-boost converter to be lowered and is very suitable for auxiliary switching power supplies, LED drive, energy gathering and the like.

Description

technical field [0001] The invention relates to the technical field of self-excited DC-DC converters, in particular to an input adaptive self-excited Buck-boost converter. Background technique [0002] Chinese patent ZL application 201210153796.5 discloses a "BJT type self-excited Buck-boost converter with small driving loss of the main switching tube", such as figure 1 As shown, it includes the main circuit composed of input capacitor Ci, PNP type BJT tube Q1, diode D, inductor L and capacitor Co, and consists of resistor R1, resistor R2, resistor R3, resistor R4, capacitor C1, NPN type BJT tube Q2 The driving unit of the main switching transistor Q1 composed of the PNP type BJT transistor Q3 also includes a current feedback branch composed of the resistor R5, the resistor R6, the resistor R7, the capacitor C2, the diode D1 and the NPN type BJT transistor Q4. This kind of Buck-boost converter has reverse polarity buck-boost voltage conversion function, simple circuit struc...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 陈怡章旌红
Owner 浙江日风电气股份有限公司
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