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Input adaptive self-excited sepic converter

An adaptive and self-excited technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problems of weak limit protection ability, large freewheeling conduction loss, and large loss , to achieve the effects of fewer components, less rectification loss, and less current detection loss

Active Publication Date: 2016-04-20
HANGZHOU BIGGER FISH BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this circuit is that: the current feedback branch uses the resistor R4 to directly detect the load current, which not only consumes a lot, but also has weak protection ability to limit the working current of the important device PNP type BJT tube Q1 in the main circuit; The circuit uses diode D for freewheeling, and the freewheeling conduction loss is relatively large

Method used

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  • Input adaptive self-excited sepic converter
  • Input adaptive self-excited sepic converter
  • Input adaptive self-excited sepic converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 2 as shown,

[0029] An input adaptive self-excited Sepic converter, including an input circuit, a main circuit and an output circuit, the input circuit includes a DC voltage source Vi and an input capacitor Ci, the output circuit includes an output capacitor Co and a load R, and the main circuit includes an inductor L1 , PNP type BJT tube Q1, NPN type BJT tube Q3, resistor R3, resistor R6, diode D1, diode D2, capacitor C5, diode D3, inductor L2, diode D4, capacitor C3, capacitor C4 and capacitor C6. The main circuit also includes an input adaptive control unit and a freewheeling sub-circuit. The input adaptive control unit includes a resistor R2, a resistor R4, a resistor R5, a capacitor C2 and an NPN type BJT tube Q2. The freewheeling subcircuit is connected to the cathode of the diode D3 and Between the positive terminals of the DC output voltage Vo.

[0030] The input capacitor Ci is connected in parallel with the DC voltage source Vi, the voltage ...

Embodiment 2

[0047] Such as image 3 , Figure 4 and Figure 5 As shown, on the basis of Embodiment 1, one end of capacitor C7 connected to the collector of NPN type BJT transistor Q3 and one end of R7 are changed to the emitter electrode of PNP type BJT transistor Q4, that is, one end of capacitor C7 and one end of R7 One end is connected to the emitter of the PNP type BJT transistor Q4, and the other end of C7 and the other end of R7 are connected to the base of the NPN type BJT transistor Q5. Other structures and working process of embodiment 2 are the same as embodiment 1.

Embodiment 3

[0049] Such as Figure 6 As shown, on the basis of Embodiment 1, a blanking time control branch composed of resistor R1 and capacitor C1 is added. One end of resistor R1 is connected to the collector of NPN type BJT transistor Q3, and the other end of resistor R1 is connected to capacitor C1 One end of the capacitor C1 is connected to the other end of the capacitor C1 and the base of the NPN BJT transistor Q2 is connected. The blanking time control branch has a correction effect on the input adaptive control unit, and can achieve the effect of widening the working range of the circuit.

[0050] Embodiment 3 In the steady state, the voltage simulation working waveform diagram of the inductor current iL1 is critically continuous and the inductor current iL2 is intermittent. Figure 7 As shown, the current simulation working waveform diagram of the inductive current iL1 in the steady state of embodiment 3 is critically continuous and the inductive current iL2 in the discontinuou...

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Abstract

The invention discloses an input adaptive auto-excitation type Sepic convertor which is composed of an input circuit, a main circuit and an output circuit, wherein the main circuit comprises an input adaptive control unit and a follow current sub circuit. When a proper value is obtained, the maximum current value iL1m of an inductor L1 or the maximum current value ic3m of a collector electrode of a bipolar junction transistor Q3 in the main circuit and a direct current voltage source Vi are in a negative linear relation or a positive linear relation or are free of characteristics. According to the input adaptive auto-excitation type Sepic convertor, the circuit working range is wide, the input adaptive current-limiting protection function is achieved, current detection loss and follow current connection loss are both small, and the convertor is suitable for the fields of auxiliary switch sources, LED drive, energy collection and the like.

Description

technical field [0001] The invention relates to a self-excited DC-DC converter, in particular to an input-adaptive self-excited Sepic converter applicable to the fields of auxiliary switch power supply, LED driving, energy collection and the like. Background technique [0002] The self-excited DC-DC converter has the advantages of simple circuit structure, fewer components, low cost, good self-starting and self-protection performance, wide applicable working voltage range, and high efficiency. [0003] figure 1 Shown is a BJT type self-excited Sepic converter with small driving loss of the main switching tube. It includes the main circuit composed of input capacitor Ci, inductor L1, NPN type BJT tube PNP type BJT tube Q1, capacitor C, inductor L2, diode D1, diode D and output capacitor Co and consists of resistor R1, resistor R2, capacitor C1, The drive unit of the main switch tube PNP BJT tube Q1 composed of the voltage regulator tube Z1 and the PNP type BJT tube NPN type...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
Inventor 陈怡陈筠
Owner HANGZHOU BIGGER FISH BIOTECHNOLOGY CO LTD
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