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BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss

A main switching tube and converter technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of affecting circuit efficiency and large driving loss, and achieve simple circuit structure and drive The effect of low loss and high light load efficiency

Active Publication Date: 2012-12-12
JIANGSU YONGDING COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this circuit is that the driving unit of the main switching tube Q1 composed of driving resistor R1, PNP type BJT tube Q2, resistor R2, resistor R3 and capacitor C1 still has a large current flow when the main switching tube Q1 is turned off. Overdrive resistor R1, resulting in large drive loss of Q1, which affects the efficiency of the circuit, especially the light-load efficiency of the circuit

Method used

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  • BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss
  • BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss
  • BJT (bipolar junction transistor)-type auto-excitation Buck converter with small main switching tube driving loss

Examples

Experimental program
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Effect test

Embodiment 1

[0021] refer to figure 2 and Figure 6, a BJT type self-excited Buck converter with low driving loss of the main switching tube includes the main loop of the Buck converter composed of an input capacitor Ci, a PNP type BJT tube Q1, a diode D, an inductor L and a capacitor Co, and the input capacitor Ci It 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 the DC voltage source Vi is connected to the negative terminal of the DC output voltage Vo and the anode of the diode D, and the DC The positive end of the voltage source Vi is connected to the emitter of the PNP-type BJT transistor Q1, the collector of the PNP-type BJT transistor Q1 is connected to one end of the inductor L and the cathode of the diode D, and the other end of the inductor L is connected to the positive end of the DC output voltage Vo connec...

Embodiment 2

[0027] refer to image 3 and Figure 7 , this embodiment includes the main circuit of the Buck converter composed of input capacitor Ci, PNP type BJT tube Q1, diode D, inductor L and capacitor Co, and the main loop of the Buck converter composed of resistor R1, resistor R2, resistor R3, capacitor C1, and NPN type BJT tube The driving unit of the main switching transistor Q1 composed of Q2 and the PNP type BJT transistor Q3 also includes a current feedback branch. The current feedback branch includes a detection resistor R6, an NPN type BJT tube Q4, a resistor R4, a resistor R5, a capacitor C2 and a diode D1, the collector of the NPN type BJT tube Q4 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the The base of the NPN BJT tube Q2 is connected, the emitter of the NPN BJT tube Q4 is connected to the negative terminal of the DC voltage source Vi, the base of the NPN BJT tube Q4 is connected to one end of the resistor R5 and the ...

Embodiment 3

[0033] refer to Figure 4 and Figure 6 , this embodiment includes the main circuit of the Buck converter composed of the input capacitor Ci, the PNP type BJT transistor Q1, the diode D, the inductor L and the capacitor Co, and also includes the driving unit of the main switch transistor Q1. The driving unit of the main switching tube Q1 is composed of a resistor R1, a resistor R2, a resistor R3, a capacitor C1, an NPN type BJT tube Q2 and a PNP type BJT tube Q3, and the collector of the NPN type BJT tube Q2 is connected to one end of the resistor R2 The other end of the resistor R2 is connected to the base of the PNP type BJT tube Q1, the emitter of the NPN type BJT tube Q2 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the negative end of the DC voltage source Vi, NPN type The base of BJT tube Q2 is connected to one end of resistor R1 and the emitter of PNP type BJT tube Q3, the other end of resistor R1 is connected to the e...

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Abstract

The invention discloses a BJT (bipolar junction transistor)-type auto-excitation Buck converter with a small main switching tube driving loss, which comprises a main loop of the Buck converter consisting of an input capacitor Ci, a main switching tube PNP type BJT tube Q1, a diode D, an inductor L and a capacitor Co. The BJT-type auto-excitation Buck converter with the small main switching tube driving loss also comprises a driving unit of the main switching tube Q1. The BJT-type auto-excitation Buck converter with the small main switching tube driving loss has the advantages of simple circuit structure, small element amount, small main switching tube driving loss and high circuit efficiency during light load.

Description

technical field [0001] The invention relates to a self-excited direct current-direct current (DC-DC) converter, which is applied to a switching stabilized voltage or current stabilized power supply, a high-brightness LED drive circuit, etc., in particular to a self-excited Buck 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 BJT (bipolar transistor) type self-excited Buck converter with simple circuit structure and few components, including input capacitor Ci, PNP type BJT tube Q1, inductor L, diode D and output capacitor The main circuit of the Buck converter composed of Co, 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 outpu...

Claims

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Application Information

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IPC IPC(8): H02M3/156
Inventor 陈怡南余荣
Owner JIANGSU YONGDING COMM
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