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Feedback type bipolar junction transistor (BJT) self-exciting Boost converter

A converter and self-excited technology, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of large driving loss and affecting circuit efficiency, etc., and achieve small driving loss and circuit Simple structure and high light load efficiency

Active Publication Date: 2015-03-04
SUZHOU SHENGXIN OPTOELECTRONICS TECH
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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 drive unit of the main switching tube Q1 composed of driving resistor R1, NPN 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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  • Feedback type bipolar junction transistor (BJT) self-exciting Boost converter
  • Feedback type bipolar junction transistor (BJT) self-exciting Boost converter
  • Feedback type bipolar junction transistor (BJT) self-exciting Boost converter

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Embodiment 1

[0019] Reference figure 2 with Figure 4 A back-fed BJT self-excited Boost converter includes the main circuit of the Boost converter composed of an input capacitor Ci, an inductor L, an NPN BJT tube Q1, a diode D, and a 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, and the negative terminal of the DC voltage source Vi is connected to the negative terminal of the DC output voltage Vo and the emitter of the NPN BJT tube Q1. The positive end of the DC voltage source Vi is connected to one end of the inductor L, the other end of the inductor L is connected to the collector of the NPN BJT tube Q1 and the anode of the diode D, and the cathode of the diode D is connected to the positive end of the output voltage Vo.

[0020] The feed-back BJT self-excited Boost converter also includes a driving unit of t...

Embodiment 2

[0025] Reference image 3 with Figure 5 This embodiment includes the main circuit of the Boost converter composed of input capacitor Ci, inductor L, NPN type BJT tube Q1, diode D, and capacitor Co, and the main switch tube composed of resistor R1, capacitor C1, and PNP type BJT tube Q2 The drive unit of Q1 also includes a current feedback branch. The current feedback branch includes an NPN type BJT tube Q3, a resistor R2, a resistor R3, a capacitor C2 and a diode D1, the collector of the NPN type BJT tube Q3 and the collector of the PNP type BJT tube Q2, and an NPN type BJT tube Q1 The base of the NPN BJT tube Q3 is connected to the negative terminal of the DC voltage source Vi, the base of the NPN BJT tube Q3 is connected to one end of the resistor R2 and the anode of the diode D1, and the other end of the resistor R2 is connected to the DC The positive end of the voltage source Vi is connected to one end of the inductor L, the cathode of the diode D1 is connected to one end...

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Abstract

The invention discloses a feedback type bipolar junction transistor (BJT) self-exciting Boost converter, which comprises a main loop of the Boost converter consisting of an input capacitor Ci, an inductor L, a main switching tube NPN type BJT transistor Q1, a diode D and a capacitor Co, and also comprises a driving unit of a main switching tube Q1, wherein the driving unit of the main switching tube Q1 consists of a resistor R1 and a PNP type BJT transistor Q2; an emitter of the PNP type BJT transistor Q2 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with a cathode of the diode D and a positive end of output voltage Vo; a base of the PNP type BJT transistor Q2 is connected with a collector of the main switching tube NPN type BJT transistor Q1; and a collector of the PNP type BJT transistor Q2 is connected with a base of the NPN type BJT transistor Q1. In order to improve the dynamic property of a circuit, a capacitor C1 is connected in parallel between the positive end of the output voltage Vo and the base of the PNP type BJT transistor Q2. The feedback type BJT self-exciting Boost converter is simple in circuit structure, small in component number, low in driving loss of main switching tubes and high in 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 switch voltage stabilized or steady current power supply, a high-brightness LED drive circuit, etc., in particular a self-excited Boost converter. Background technique [0002] Compared with linear (regulated or regulated current) regulators and separately excited DC-DC converters, self-excited DC-DC converters have significant advantages of high cost performance. figure 1 What is given is a BJT (bipolar transistor) self-excited Boost converter with a simple circuit structure and a small number of components, including an input capacitor Ci, an inductor L, an NPN BJT tube Q1, a diode D and an output capacitor The main circuit of the Boost 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/36
Inventor 陈怡南余荣
Owner SUZHOU SHENGXIN OPTOELECTRONICS TECH