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Bipolar transistor self-exciting Buck-Boost converter

A technology of bipolar transistors and converters, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electric variables, etc., and can solve the problem of narrow application range and complex circuit structure of self-excited step-up DC-DC converters Problems such as the number of components, etc., to achieve the effect of fewer components and simple circuit structure

Active Publication Date: 2012-05-16
金湖县农副产品营销协会
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of the existing self-excited step-down DC-DC converter with complex circuit structure, a large number of components, and the narrow application range of the self-excited step-up DC-DC converter, the present invention provides a circuit Bipolar transistor type self-excited Buck-Boost converter with simple structure, few components and wide application range

Method used

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  • Bipolar transistor self-exciting Buck-Boost converter
  • Bipolar transistor self-exciting Buck-Boost converter
  • Bipolar transistor self-exciting Buck-Boost converter

Examples

Experimental program
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Effect test

Embodiment 1

[0022] refer to image 3 and Figure 5, a bipolar transistor type self-excited Buck-Boost converter, including the main circuit of the Buck-Boost converter composed of PNP transistor Q1, inductor L1, diode D1 and capacitor C2, the voltage across the load R6 is the DC output voltage Vo, the negative terminal of the DC input voltage Vi is connected to the positive terminal of the DC output voltage Vo, the load R6 is connected in parallel with the capacitor C2, and the contact point between the negative terminal of the DC output voltage Vo and the capacitor C2 is connected to the anode of the diode D1, so The cathode of the diode D1 is connected to one end of the inductance L1, the other end of the inductance L1 is connected to the negative end of the DC input voltage Vi, the positive end of the DC output voltage Vo and the contact point of the capacitor C2 are connected to the negative end of the DC input voltage Vi connected, the self-excited Buck-Boost converter also includes...

Embodiment 2

[0028] refer to Figure 4 and Figure 6 , the present embodiment also includes a current feedback branch: one end of the parallel branch of the detection resistor R5 and the capacitor C3 is connected with the resistor R6 and the base of the NPN transistor Q3, and the other end is connected with the capacitor C2 and the emitter of the NPN transistor Q3; Q3 The collector of Q3 is connected to the base of Q2 through resistor R4, and the emitter of Q3 is connected to the anode of diode D1.

[0029] The working process of this embodiment is:

[0030] (1) The power-on start-up stage of the circuit is the same as that of Embodiment 1. After several cycles, when the output current of the circuit reaches the set value Io, the circuit has just completed the power-on start-up process and enters the steady-state working stage.

[0031] (2) The steady-state working stage of the circuit: when the output current of the circuit reaches the set value Io, the current feedback branch of the ci...

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Abstract

A bipolar transistor self-exciting Buck-Boost converter comprises a PNP transistor Q1, an inductor L1, a diode D1 and a capacitor C2 which form a main circuit of the Buck-Boost converter and also comprises a PNP transistor Q2, wherein the emitting electrode of the PNP transistor Q1 is connected with the positive terminal of direct current input voltage Vi; the junction of the inductor L1 and the diode D1 is connected with the collecting electrode of the PNP transistor Q1; the emitting electrode and the collecting electrode of the PNP transistor Q2 are respectively connected with the emitting electrode and the base electrode of the PNP transistor Q1; the base electrode of the PNP transistor Q1 is also connected to the negative terminal of direct current input voltage Vi by a resistor R1; series branch circuits of a resistor R2 and a resistor R3 are connected at the two ends of the emitting electrode and the collecting electrode of the Q1 in parallel; and the junction of the resistor R2and the resistor R3 is connected with the base electrode of the PNP transistor Q2. The converter has simple circuit structure, a few of components and widened application range.

Description

technical field [0001] The invention relates to a self-excited DC-DC converter, which is applied to a low-power switch voltage stabilized / current-stabilized power supply, a high-brightness LED drive circuit, etc., in particular to a self-excited Buck-Boost converter. Background technique [0002] Compared with low-power linear power supply and low-power self-excited DC-DC converter, low-power self-excited DC-DC converter has simple circuit structure, fewer components, low cost, good self-starting and self-protection performance, It has the advantages of wide working voltage range and high efficiency. [0003] Chinese patent ZL99108088.2 discloses a self-excited step-down DC-DC converter, such as figure 1 shown. The main loop of the Buck converter is composed of PNP transistor Q1, coupling inductor L1, diode D1 and capacitor C2. Vi and Vo are the DC input and output voltages respectively, and R7 is the load. The coupled inductor L2 is connected to the emitter and the base ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
Inventor 陈怡
Owner 金湖县农副产品营销协会
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