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Input adaptive self-excited buck 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: 2016-05-04
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 current-limiting converter with input self-adaptive for the deficiencies of the existing self-excited Buck converter in terms of current detection loss, current-limiting protection capability of important devices, freewheeling conduction loss, etc. Input Adaptive Self-excited Buck Converter with Small Protection Capability, Current Detection Loss and Freewheeling Conduction Loss

Method used

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  • Input adaptive self-excited buck converter
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  • Input adaptive self-excited buck converter

Examples

Experimental program
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Embodiment 1

[0032] 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 Q3, an output capacitor Co, and is used to drive a PNP type BJT The driving circuit of the tube Q3 and the freewheeling sub-circuit for reducing the freewheeling conduction loss; the driving circuit includes an NPN type BJT tube Q2, a resistor R2, a resistor R4, a resistor R6, a diode D1, a capacitor C1 and a diode D3; The input adaptive control circuit includes NPN type BJT tube Q1, diode D2, resistor R1, capacitor C2, resistor R3 and resistor R5; the freewheeling sub-circuit includes PNP type BJT tube Q5, NPN type BJT tube Q4, resistor R7, Resistor R9, resistor R8, resistor R10, capacitor C3 and capacitor C4. The function of the diode D3 is to feed back the excess parasitic oscillation energy to the DC voltage source Vi, the function of the capac...

Embodiment 2

[0042] refer to Figure 5 , Embodiment 2 also includes a Zener tube Z on the basis of Embodiment 1, the cathode of the Zener tube Z is connected to the base of the NPN type BJT tube Q2, and the anode of the Zener tube Z is connected to the negative terminal of the DC voltage source Vi , Zener tube Z has the function of widening the working range of the circuit.

[0043] 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 vb2 of Q2 is equal to the reverse conduction voltage drop VZ of the Zener transistor Z.

[0044] In the above descr...

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Abstract

The invention relates to an input adaptive auto-excitation type Buck converter. The input adaptive auto-excitation type Buck 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 Q3, an output capacitor Co, a drive circuit used for driving the PNP type BJT tube Q3 and a flywheel sub-circuit used for lowering the follow current conduction loss; the drive circuit comprises an NPN type BJT tube Q2, a resistor R2, a resistor R4, a resistor R6 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 R5. According to the input adaptive auto-excitation type Buck converter, the input adaptive control circuit controls the current of the inductor L or the collecting electrode current of the PNP type BJT tube Q3 and has a current limit function with the input adaptive characteristic, and moreover, the input adaptive control circuit also realizes smaller current detection loss; the flywheel sub-circuit enables the follow current conduction loss of the Buck converter to be lowered and the input adaptive auto-excitation type Buck converter is very suitable for auxiliary switching power supplies, LED drive, energy collection 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 converter. Background technique [0002] Chinese patent ZL201210154711.5 discloses a "BJT-type self-excited Buck converter with low 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 the main circuit composed of resistor R1, resistor R2, resistor R3, capacitor C1, NPN type BJT tube (bipolar junction type transistor) Q2 and PNP type BJT tube Q3, the drive unit of the main switch tube Q1 also includes a current feedback branch composed of resistor R4, resistor R5, resistor R6, capacitor C2, diode D1 and NPN type BJT tube Q4. This kind of Buck converter has the function of step-down voltage conversion, the circuit structure is simple, the number of components is small, and the couplin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
Inventor 陈怡章旌红
Owner 浙江日风电气股份有限公司
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