Self-stimulated DC-DC converter with switch at input side, and interleaved parallel connection form thereof

A DC-DC, input-side technology, applied in the direction of converting DC power input into DC power output, output power conversion devices, instruments, etc.

Pending Publication Date: 2019-05-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the start-up problem of the existing self-excited Buck-Boost converter, the present invention provides a self-excited DC-DC converter whose switch is located on the input side and its interleaved parallel form, which are not only easy to start-up, but also have various forms ——Can form Buck-Boost converter, Zeta converter, Flyback converter, Buck converter, etc.

Method used

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  • Self-stimulated DC-DC converter with switch at input side, and interleaved parallel connection form thereof
  • Self-stimulated DC-DC converter with switch at input side, and interleaved parallel connection form thereof
  • Self-stimulated DC-DC converter with switch at input side, and interleaved parallel connection form thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0090] refer to Figure 2 to Figure 4 , a self-excited DC-DC converter with a switch on the input side, including a self-excited unit and a freewheeling unit, the self-excited unit includes resistors Rs2 to Rs3, resistor Rp2, capacitor Cs1, capacitor Cp1, diode Ds1, diode Dp1, inductor L1, PNP type BJT tube Qs1 and PNP type BJT tube Qp1, the freewheeling unit has ports c_1, port c_2, port c_3 and port c_4, and the function of the freewheeling unit is to act as a PNP type BJT When the tube Qp1 is cut off, it provides a current path for the inductor L1. The emitter of the PNP-type BJT tube Qs1 is simultaneously connected to the positive terminal of the DC power supply Vi, the cathode of the diode Ds1, the cathode of the diode Dp1 and the emitter of the PNP-type BJT tube Qp1, and the base of the PNP-type BJT tube Qs1 is simultaneously connected to the diode The anode of Ds1 is connected to one end of resistor Rs2, the collector of PNP type BJT tube Qs1 is connected to one end of...

Embodiment 2

[0099] refer to Figure 5 to Figure 7, a self-excited DC-DC converter with a switch on the input side. The self-excited unit includes a resistor Rs1 and a resistor Rp1. The resistor Rs1 and the resistor Rp1 are used as voltage limiting resistors. One end of the resistor Rs1 is connected to the other end of the capacitor Cs1. The resistor One end of Rp1 is connected to the other end of capacitor Cp1.

[0100] Other structures of embodiment 2 are the same as embodiment 1. The working process of embodiment 2 is also similar to embodiment 1 except that the function of Rs1 and Rp1 is to limit the terminal voltage of Cs1 and Cp1.

[0101] refer to Figure 8 , when the freewheeling module preferred scheme 1 is adopted, embodiment 2 essentially becomes a self-excited Buck-Boost converter. In the steady state, the polarity of the output voltage Vo of the embodiment 2 adopting the first preferred scheme of the freewheeling unit is opposite to Vi, and the size of Vo satisfies one of: ...

Embodiment 3

[0105] refer to Figure 17 to Figure 20 , a self-excited DC-DC converter with a switch on the input side, including a self-excited unit, an inductor L1 and a capacitor Co, the self-excited unit includes resistors Rs2 to Rs3, resistor Rp2, capacitor Cs1, capacitor Cp1, Diode Ds1, diode Dp1, diode D1, PNP type BJT transistor Qs1 and PNP type BJT transistor Qp1. The emitter of the PNP-type BJT tube Qs1 is simultaneously connected to the positive terminal of the DC power supply Vi, the cathode of the diode Ds1, the cathode of the diode Dp1 and the emitter of the PNP-type BJT tube Qp1, and the base of the PNP-type BJT tube Qs1 is simultaneously connected to the diode The anode of Ds1 is connected to one end of resistor Rs2, the collector of PNP type BJT tube Qs1 is connected to one end of resistor Rs3 and one end of capacitor Cs1 at the same time, the base of PNP type BJT tube Qp1 is connected to the anode of diode Dp1 and one end of resistor Rp2 at the same time The other end of ...

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PUM

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Abstract

The invention discloses a self-stimulated DC-DC converter with a switch at an input side, and an interleaved parallel connection form thereof. The self-stimulated DC-DC converter with the switch at the input side comprises one self-stimulating unit and a follow current unit, or a self-stimulating unit, an inductor L1 and a capacitor C0. The interleaved parallel connection form of the self-stimulated DC-DC converter comprises one self-stimulating unit and n flow current units, or one self-stimulating unit, the inductors L1-1 to Ln-1 and the capacitor C0. The self-stimulated DC-DC converter withthe switch at the input side, which can be formed by the invention, and the interleaved parallel connection form thereof (comprising a Buck-Boost converter, a Zeta converter, a Flyback converter, a Buck converter, and so on), can satisfy diversified power conversion demands, meanwhile, also have the following advantages: being easy to start oscillation, having low requirements on elements and devices participating in self stimulating, being easy to expand and increasing capacitor.

Description

technical field [0001] The invention relates to a DC-DC converter with a switch located on the input side and its interleaved parallel form, which is suitable for low-power working occasions and applicable fields such as energy collection, LED driving, auxiliary power supply and the like. Background technique [0002] Common DC-DC converters with switches on the input side include Buck-Boost converters, Zeta converters, Flyback converters, and Buck converters. Compared with other excited DC-DC converters, self-excited DC-DC converters have the advantage of cost performance. like figure 1 As shown, an existing self-excited Buck-Boost converter consists of resistors R1 to R3, PNP type BJT tubes Q1 and Q2, inductor L, diode D and capacitor Co. The circuit structure of the converter is simple, but whether the whole converter can start to vibrate smoothly is directly related to the values ​​of R2 and R3. When R2 and R3 are improperly designed, it will cause the consequences th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
Inventor 陈怡
Owner ZHEJIANG UNIV OF TECH
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