CN104201899B - A kind of low voltage DC/DC conversion equipment - Google Patents
A kind of low voltage DC/DC conversion equipment Download PDFInfo
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- CN104201899B CN104201899B CN201410465767.1A CN201410465767A CN104201899B CN 104201899 B CN104201899 B CN 104201899B CN 201410465767 A CN201410465767 A CN 201410465767A CN 104201899 B CN104201899 B CN 104201899B
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Abstract
Disclosure one low voltage DC/DC conversion equipment, comprises rectifying and wave-filtering diode (VD1), low voltage starting PWM controller (U1), autotransformer (T2), output filter circuit and MOS switch pipe；The rectified filtered diode in DC supply input one tunnel inputs the input to low voltage starting PWM controller and control end, and another road is connected to the input of autotransformer primary coil；The outfan of low voltage starting PWM controller connects the grid of MOS switch pipe, the source ground of MOS switch pipe, drain electrode connects autotransformer primary coil outfan and secondary coil input respectively, autotransformer primary coil output voltage returns the input of low voltage starting PWM controller, the secondary coil outfan output voltage of autotransformer；The autotransformer low-voltage boosting to input, improves the input voltage of low voltage starting PWM controller, and by controlling the break-make of MOS switch pipe, regulated output voltage, it is achieved the input of low-voltage and high-current is changed, it is provided that meet the high voltage output of system requirements.
Description
Technical field
The present invention relates to electronic circuit field, specifically a kind of low voltage DC/DC conversion equipment.
Background technology
Known, Switching Power Supply, due to the distinctive advantage such as easy to use, efficiency high power is big, is widely used in a lot of fields, creates huge social value and economic benefit.But at low-voltage power supply system, particularly about 1V single battery is seldom applied in powering, it is primarily due to single battery power little output electric current little and be mainly used in Micro Energy Lose system, because of without DC/DC Switching Power Supply.Development along with technical development, some special cells can accomplish heavy-current discharge, such as unit plumbic acid chemical cell, but its output voltage is extremely low, low reaching 0.9V, being unsatisfactory for the requirement of system, so being accomplished by its voltage is changed, still do not have DC/DC conversion equipment to be capable of carrying out the input of low-voltage and high-current conversion step-up at present, and high efficiency conversion and the purpose of high voltage output are provided.
Summary of the invention
It is an object of the invention to provide a kind of low voltage DC/DC conversion equipment, the input of low-voltage and high-current can be changed by this conversion equipment, it is provided that meet the high voltage output of system requirements, and conversion efficiency is high.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of low voltage DC/DC conversion equipment, comprises rectifying and wave-filtering diode, low voltage starting PWM controller, autotransformer, output filter circuit and MOS switch pipe；The rectified filtered diode of DC supply input inputs the voltage input end to low voltage starting PWM controller and control end, and DC supply input is additionally coupled to the input of autotransformer primary coil；The outfan of low voltage starting PWM controller connects the grid of MOS switch pipe, the source ground of MOS switch pipe, the drain electrode of MOS switch pipe connects the outfan of autotransformer primary coil and the input of secondary coil respectively, the output voltage of the outfan of autotransformer primary coil returns the voltage input end of low voltage starting PWM controller, the secondary coil outfan of autotransformer is through output filter circuit output voltage, and the secondary coil outfan of autotransformer also feeds back to the feedback end of low voltage starting PWM controller through voltage sampling circuit.
Further, described low voltage starting PWM controller adopts XC6368 chip.
The invention has the beneficial effects as follows, the low-voltage of input is boosted by autotransformer, and return the input of low voltage starting PWM controller, improve the input voltage of low voltage starting PWM controller, significantly reduce the conducting resistance of MOS switch pipe simultaneously, improve conversion efficiency, and the break-make of MOS switch pipe is controlled on demand by low voltage starting PWM controller, regulated output voltage, it is achieved the input of the low-voltage and high-current lower than 0.9V is changed, it is provided that meet the high voltage output of system requirements.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
As it is shown in figure 1, the present invention provides a kind of low voltage DC/DC conversion equipment, comprise rectifying and wave-filtering diode VD1, low voltage starting PWM controller U1, autotransformer T2, output filter circuit and MOS switch pipe V1, low voltage starting PWM controller U1 can select XC6368 chip；After the second grounded for DC supply input Vin electric capacity C2 filtering, being connected to the voltage input end VDD and control end CE of low voltage starting PWM controller U1 after a road series rectifier filtered diode VD1, the other end is connected to the input 1 of autotransformer T2 primary coil；The outfan EXT of low voltage starting PWM controller U1 connects the grid of MOS switch pipe V1, the GND end ground connection of low voltage starting PWM controller U1；The source ground of MOS switch pipe V1, the drain electrode of MOS switch pipe V1 connects the outfan 2 of autotransformer T2 primary coil and the input 3 of secondary coil respectively, the outfan 2 of autotransformer T2 primary coil connects the anode of the second diode VD2, the negative electrode of the second diode VD2 is connected with the negative electrode of rectifying and wave-filtering diode VD1, and the negative electrode of the second diode VD2 is also by the 3rd electric capacity C3 ground connection；The secondary coil outfan 4 of autotransformer T2 is connected output voltage Vout after the 3rd diode VD3 and inductance L1, and the two ends of inductance L1 connect the 4th electric capacity C4 and the five electric capacity C5 respectively, and the other end of the 4th electric capacity C4 and the five electric capacity C5 distinguishes ground connection；The negative electrode of the 3rd diode VD3 is connected ground connection after the first resistance R1 and the second resistance R2, and the two ends of the first resistance R1 the first electric capacity C1 in parallel, the link of the first resistance R1 and the second resistance R2 is connected with the feedback end FB of low voltage starting PWM controller U1.
The low-voltage of DC supply input Vin input is through the filtering of the second electric capacity C2, and through the voltage input end VDD and control end CE of rectifying and wave-filtering diode VD1 input to low voltage starting PWM controller U1, power to low voltage starting PWM controller U1 and activate low voltage starting PWM controller U1 work, the outfan EXT of low voltage starting PWM controller U1 exports low voltage pulse signal, control MOS switch pipe V1 conducting Guan Bi, when MOS switch pipe V1 turns on, autotransformer T2 starts energy storage, when MOS switch pipe V1 closes, autotransformer T2 starts to release energy, and produce forward voltage to external world's power supply at autotransformer T2 primary coil outfan 2 and secondary coil outfan 4；After autotransformer T2 boosting, its primary coil outfan 2 output voltage filters through diode VD2 rectification and the 3rd electric capacity C3 and inputs to low voltage starting PWM controller U1, this voltage is more than Vin, rectifying and wave-filtering diode VD1 is made to end, Vin stops inputting to low voltage starting PWM controller U1, the pulse amplitude of at this moment low voltage starting PWM controller U1 outfan EXT output also will increase, thus significantly reducing the conducting resistance of MOS switch pipe V1, the energy conversion efficiency of autotransformer T2 is made to uprise；The malleation voltage of autotransformer T2 secondary coil outfan 4 output, through the 3rd diode VD3 rectification, is then filtered then through the output filter circuit being made up of the 4th electric capacity C4, inductance L1 and the five electric capacity C5, outwardly provides High voltage output Vout；Voltage after 3rd diode VD3 rectification simultaneously is through the first resistance R1 and the second resistance R2 dividing potential drop, and by the feedback end FB of output voltage sampling feedback to low voltage starting PWM controller U1 after the first electric capacity C1 filtering, low voltage starting PWM controller U1 adjusts output pulse width according to feedback voltage, when exporting Vout voltage and being too high, output pulse width diminishes, autotransformer conversion energy will diminish, output Vout voltage is made to reduce, when exporting Vout voltage and being too low, output pulse width becomes big, autotransformer conversion energy will become big, output Vout voltage is made to raise, ensure that output Vout voltage is stable thereby through such closed loop control.
The startup voltage of low voltage starting PWM controller U1 is lower than 0.9V, it is ensured that device can work under 0.9V at DC supply input Vin, and input current, more than 3A, improves the V of MOS switch pipe additionally by self coupling voltageGS, make the conducting resistance of MOS switch pipe be down to about 5m Ω, when MOS switch pipe is by peak point current 5A, its pressure drop is lower than 50mV, and such MOS switch pipe is at VDSDuring for 1V, efficiency reaches 95%, and the conversion efficiency of autotransformer is 95% simultaneously, removes other secondary loss factors, the conversion efficiency of whole conversion equipment so can be made to reach 85%；By adjusting the first resistance R1 and the ratio of the second resistance R2, adjust the feedback voltage of input low voltage starting PWM controller, make the step-up ratio of device reach more than 20.The low-voltage of input is boosted by autotransformer T2, and return the input of low voltage starting PWM controller, improve the input voltage of low voltage starting PWM controller, significantly reduce the conducting resistance of MOS switch pipe simultaneously, improve conversion efficiency, export big electric current, and controlled the break-make of MOS switch pipe, regulated output voltage by low voltage starting PWM controller on demand.Adopting low voltage control low voltage starting PWM controller, select the topological structure of self coupling inverse-excitation type, the two cooperates, it is achieved the input of low-voltage and high-current is changed, it is provided that meet the high voltage output of system requirements.
The above, be only presently preferred embodiments of the present invention, and the present invention not does any pro forma restriction；Any those of ordinary skill in the art, without departing from, under technical solution of the present invention ambit, may utilize the method for the disclosure above and technology contents and technical solution of the present invention is made many possible variations and modification, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content without departing from technical solution of the present invention, to any simple modification made for any of the above embodiments, equivalent replacement, equivalence change and modify according to the technical spirit of the present invention, all still fall within the scope of technical solution of the present invention protection.
Claims (2)
1. low voltage DC/DC conversion equipment, it is characterized in that, described device comprises rectifying and wave-filtering diode (VD1), low voltage starting PWM controller (U1), autotransformer (T2), output filter circuit and MOS switch pipe (V1)；Described autotransformer (T2) is booster transformer；DC supply input (Vin) rectified filtered diode (VD1) inputs the voltage input end (VDD) to low voltage starting PWM controller (U1) and control end (CE), and DC supply input (Vin) is additionally coupled to the input (1) of autotransformer (T2) primary coil；The outfan (EXT) of low voltage starting PWM controller (U1) connects the grid of MOS switch pipe (V1), the source ground of MOS switch pipe (V1), the drain electrode of MOS switch pipe (V1) connects the outfan (2) of autotransformer (T2) primary coil and the input (3) of secondary coil respectively, the output voltage of the outfan (2) of autotransformer (T2) primary coil returns the voltage input end (VDD) of low voltage starting PWM controller (U1), the secondary coil outfan (4) of autotransformer (T2) is through output filter circuit output voltage (Vout), the secondary coil outfan (4) of autotransformer (T2) also feeds back to the feedback end (FB) of low voltage starting PWM controller (U1) through voltage sampling circuit.
2. a kind of low voltage DC/DC conversion equipment according to claim 1, it is characterised in that described low voltage starting PWM controller adopts XC6368 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410465767.1A CN104201899B (en) | 2014-09-15 | 2014-09-15 | A kind of low voltage DC/DC conversion equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410465767.1A CN104201899B (en) | 2014-09-15 | 2014-09-15 | A kind of low voltage DC/DC conversion equipment |
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| CN104201899A CN104201899A (en) | 2014-12-10 |
| CN104201899B true CN104201899B (en) | 2016-06-29 |
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| CN201410465767.1A Active CN104201899B (en) | 2014-09-15 | 2014-09-15 | A kind of low voltage DC/DC conversion equipment |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471212A (en) * | 2002-07-24 | 2004-01-28 | 冉茂鑫 | Autoconnected mutual-inductive uninterrupted voltage conversion method and uninterruption switch power source thereof |
| CN200969057Y (en) * | 2006-11-24 | 2007-10-31 | 北京新雷能有限责任公司 | Undervoltage canceling circuit |
| CN201247319Y (en) * | 2008-08-21 | 2009-05-27 | 金华市蓝海光电技术有限公司 | Low power consumption laser distance-measuring instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102405587A (en) * | 2010-05-04 | 2012-04-04 | 华为技术有限公司 | Dc/dc converter |
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- 2014-09-15 CN CN201410465767.1A patent/CN104201899B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471212A (en) * | 2002-07-24 | 2004-01-28 | 冉茂鑫 | Autoconnected mutual-inductive uninterrupted voltage conversion method and uninterruption switch power source thereof |
| CN200969057Y (en) * | 2006-11-24 | 2007-10-31 | 北京新雷能有限责任公司 | Undervoltage canceling circuit |
| CN201247319Y (en) * | 2008-08-21 | 2009-05-27 | 金华市蓝海光电技术有限公司 | Low power consumption laser distance-measuring instrument |
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| CN104201899A (en) | 2014-12-10 |
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