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Self-excited bjt bridgeless buck PFC rectifier circuit

A rectifier circuit, self-excited technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as low drive efficiency, complex MOSFET drive circuit, and poor self-starting performance , to achieve the effect of high driving efficiency, easy self-starting and simple circuit

Active Publication Date: 2017-08-22
LIANGXIN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the existing MOSFET type bridgeless Buck PFC rectifier circuit, the MOSFET drive circuit is complex, the drive efficiency is low, and the self-starting performance is poor. The present invention provides a simplified drive circuit structure, high drive efficiency, and easy self-starting Self-excited BJT bridgeless Buck PFC rectifier circuit with start-up performance

Method used

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  • Self-excited bjt bridgeless buck PFC rectifier circuit
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  • Self-excited bjt bridgeless buck PFC rectifier circuit

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Embodiment 1

[0025] Embodiment 1: refer to figure 1 , image 3 , Figure 5 and Figure 6 , Embodiment 1 of the present invention has the function of input current limiting protection, which consists of input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, inductor L1, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, controlled current source group M1. Among them, the controlled current source M1 is composed of NPN type BJT tube Qa1, NPN type BJT tube Qa2, NPN type BJT tube Qa3, NPN type BJT tube Qa4, resistor Ra1, resistor Ra2, resistor Ra3, resistor Ra4, resistor Ra5, resistor Ra6 composition.

[0026] Such as image 3 As shown, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, the emitter of the PNP BJT transistor Q1, the emitter of the PNP ...

Embodiment 2

[0038] Embodiment 2: refer to figure 1 , Figure 4 , Figure 7 and Figure 8 , Embodiment 2 of the present invention has an output voltage stabilizing function, which consists of input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, inductor L1, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, controlled current source group M1. Among them, the controlled current source group M1 is composed of NPN type BJT tube Qb1, NPN type BJT tube Qb2, NPN type BJT tube Qb3, NPN type BJT tube Qb4, resistor Rb1, resistor Rb2, resistor Rb3, resistor Rb4, resistor Rb5, resistor Composed of Rb6, resistor Rb7, resistor Rb8, and capacitor Cb1.

[0039] Such as Figure 4As shown, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, ...

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PUM

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Abstract

The invention provides a self-excited BJT (Bipolar Junction Transistor) type bridge-free Buck PFC rectifying circuit which comprises an input capacitor (Ci), a PNP type BJT (Q1), a PNP type BJT (Q2), an NPN type BJT (Q3), an NPN type BJT (Q4), a PNP type BJT (Q5), a PNP type BJT (Q6), a diode (D1), an inductor (L1), an output capacitor (Co), a resistor (R1), a resistor (R2), a resistor (R3), a resistor (R4), a resistor (R5), a resistor (R6), and a controlled current source module (M1) which controls a base electrode current of the PNP type BJT(Q1) through a port (a) thereof to further control the working state of the PNP type BJT (Q1) and controls a base electrode current of the PNP type BJT (Q2) through a port (b) thereof to further control the working state of the PNP type BJT (Q2). According to the invention, the driving circuit structure is simplified, driving efficiency is increased and the circuit achieves easy self-starting.

Description

technical field [0001] The invention relates to a PFC rectifier circuit, which is applied to high-quality electric energy conversion occasions of AC input and DC output, such as: micro energy collection system, new energy power generation system, battery charging system, LED lighting system, etc., especially a bridgeless BuckPFC rectifier circuit. Background technique [0002] PFC rectifier circuit is a circuit with power factor correction (PFC) function that can convert AC power into DC power, which can improve the utilization rate of DC load to AC power and reduce the pollution of current harmonics to AC bus or AC power grid. . [0003] The traditional Buck PFC rectifier circuit is a PFC rectifier circuit, and its main circuit is generally composed of a bridge rectifier circuit cascaded with a Buck circuit. In order to reduce the loss of the bridge rectifier circuit, a bridgeless Buck PFC rectifier circuit came into being. The bridgeless BuckPFC rectifier circuit mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
Inventor 陈怡
Owner LIANGXIN ELECTRIC CO LTD
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