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Self-excited type BJT type bridgeless Sepic PFC rectifying 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: 2016-01-06
SHANGHAI XINLONG SEMICON TECH 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 deficiencies of the existing MOSFET type bridgeless SepicPFC rectifier circuit, the MOSFET driving circuit is complex, the driving efficiency is low, and the self-starting performance is poor, the present invention provides a simplified driving circuit structure, high driving efficiency, and easy self-starting The performance of self-excited BJT bridgeless SepicPFC rectifier circuit

Method used

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  • Self-excited type BJT type bridgeless Sepic PFC rectifying circuit
  • Self-excited type BJT type bridgeless Sepic PFC rectifying circuit
  • Self-excited type BJT type bridgeless Sepic PFC rectifying 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 an input voltage feedforward function, which consists of input capacitor Ci, NPN type BJT tube Q1, NPN type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, NPN type BJT tube Q5, NPN Type BJT tube Q6, NPN type BJT tube Q7, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, inductor L1, inductor L2, inductor L3, capacitor Cs, output capacitor Co , resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, controlled current source group M1. Among them, the controlled current source M1 is composed of NPN BJT transistor Qa1, NPN BJT transistor Qa2, NPN BJT transistor Qa3, resistor Ra1, resistor Ra2, resistor Ra3, resistor Ra4, resistor Ra5, resistor Ra6.

[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 sup...

Embodiment 2

[0038] Embodiment 2: refer to figure 1 , Figure 4 , Figure 7 and Figure 8 , Embodiment 2 of the present invention has output voltage stabilizing function, and it is composed of input capacitor Ci, NPN type BJT tube Q1, NPN type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, NPN type BJT tube Q5, NPN type BJT tube Q6, NPN type BJT tube Q7, diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, diode D8, inductor L1, inductor L2, inductor L3, capacitor Cs, output capacitor Co, Composed of resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, and controlled current source group M1. Among them, the controlled current source group M1 is composed of an NPN BJT transistor Qb1, an NPN BJT transistor Qb2, an NPN BJT transistor Qb3, and a voltage regulator transistor VZ1.

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

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PUM

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Abstract

A self-excited type BJT type bridgeless Sepic PFC rectifying circuit is disclosed. The rectifying circuit comprises an input capacitor Ci, an NPN type BJT tube Q1, an NPN type BJT tube Q2, an NPN type BJT tube Q3, an NPN type BJT tube Q4, an NPN type BJT tube Q5, an NPN type BJT tube Q6, an NPN type BJT tube Q7, a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a diode D8, an inductor L1, an inductor L2, an inductor L3, a capacitor Cs, an output capacitor Co, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a controlled power supply source group M1. The invention provides the self-excited type BJT type bridgeless Sepic PFC rectifying circuit with simplified driving circuit structure, higher driving efficiency and good self-starting performance.

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 Sepic PFC 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 Sepic PFC rectifier circuit is a PFC rectifier circuit, and its main circuit is generally composed of a bridge rectifier circuit cascaded with a Sepic circuit. In order to reduce the loss of the bridge rectifier circuit, a bridgeless SepicPFC rectifier circuit came into being. The bridgeless SepicPFC rectifier circuit m...

Claims

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Application Information

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IPC IPC(8): H02M7/217
Inventor 陈怡葛羽嘉南余荣
Owner SHANGHAI XINLONG SEMICON TECH CO LTD
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