CN104467409A - Voltage reduction conversion circuit achieving adjustable voltage - Google Patents
Voltage reduction conversion circuit achieving adjustable voltage Download PDFInfo
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- CN104467409A CN104467409A CN201410679992.5A CN201410679992A CN104467409A CN 104467409 A CN104467409 A CN 104467409A CN 201410679992 A CN201410679992 A CN 201410679992A CN 104467409 A CN104467409 A CN 104467409A
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- resistance
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the field of development of circuit boards and discloses a voltage reduction conversion circuit achieving adjustable voltage. According to the voltage reduction conversion circuit achieving adjustable voltage, by adjusting an adjustable resistor RX1 of a resistor-adjustable unit, the output voltage of a voltage reduction conversion chip is changed, and therefore stable output of different target voltages can be achieved, the voltage reduction conversion circuit achieving the adjustable voltage has higher practicability, development and debugging of a circuit board are facilitated, fine adjustment of output voltage can also be achieved, and it is avoided that the chip works under an overvoltage state or an undervoltage state.
Description
Technical field
The present invention relates to circuit board development field, particularly, relate to and a kind ofly realize the adjustable decompression converting circuit of voltage.
Background technology
Circuit board has another name called printed substrate, is a kind of by the circuit board of multiple chip or combination of devices realize target function together.Circuit board relates to multiple dissimilar chip, their supply power voltage may not be identical, but in order to the interface of circuit board, conventional input voltage source only has one (such as external 5V or 12V voltage source), normally work to enable each chip, need design decompression converting circuit to realize local step-down, normally work with driving chip.Such as the operating voltage of FPGA (Field-Programmable Gate Array, field programmable gate array) chip is 3.3V, just needs decompression converting circuit external 5V voltage to be down to 3.3V and normally works to drive fpga chip.
Device parameters due to current decompression converting circuit is all fixing, a decompression converting circuit can only be depressured to a fixed target value, but in exploitation debug process, often need the chip changing different operating voltage, current decompression converting circuit will be no longer practical, need to redesign, make troubles to development, simultaneously because the device parameters in decompression converting circuit is all fixed value, often accurately can not reach intended target, can not finely tune, chip operationally may be in under-voltage condition or overvoltage condition.
For the limitation of above-mentioned current decompression converting circuit, needing to provide a kind of and realize the adjustable decompression converting circuit of voltage, by regulating the device parameters in decompression converting circuit, realizing the stable output of different target voltage, make it have practicality widely, facilitate the exploitation of circuit board to debug.
Summary of the invention
For the limitation of above-mentioned current decompression converting circuit, the invention provides and a kind ofly realize the adjustable decompression converting circuit of voltage, by regulating the device parameters in decompression converting circuit, the stable output of different target voltage can be realized, thus there is practicality widely, facilitate the exploitation of circuit board to debug.
The technical solution used in the present invention, provides and a kind ofly realizes the adjustable decompression converting circuit of voltage, it is characterized in that, comprise: step-down conversion chip, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, inductance L 1, polar capacitor PC1, polar capacitor PC2, polar capacitor PC3 and resistance adjustment unit, the EN of step-down conversion chip holds the first end of contact resistance R1, second end of resistance R1 connects direct voltage source VCC, the VFB of step-down conversion chip holds the first end of contact resistance R2 and the first end of resistance R3, the second end ground connection of resistance R3, the VREG end of step-down conversion chip connects the first end of electric capacity C1, second termination of electric capacity C1, the SS end of step-down conversion chip connects the first end of electric capacity C2, the second end ground connection of electric capacity C2, the VIN end of step-down conversion chip connects first end and the direct voltage source VCC of electric capacity C3, the second end ground connection of electric capacity C3, the anode of polar capacitor PC1 connects the first end of electric capacity C3, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C3, the minus earth of polar capacitor PC2, the VBST end of step-down conversion chip connects the first end of electric capacity C4, the SW end of step-down conversion chip connects second end of electric capacity C4, second end of electric capacity C4 connects the first end of inductance L 1 simultaneously, second end of inductance L 1 connects the first end of electric capacity C5 and second end of resistance R2, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5, the anode of polar capacitor PC3 connects the first end of electric capacity C5, the minus earth of polar capacitor PC3, the first end of the first end of electric capacity C5 contact resistance R4 simultaneously, second end of resistance R4 connects voltage output end VDD, resistance adjustment unit is connected in parallel on the two ends of resistance R2.
Concrete, described adjustable resistance unit comprises adjustable resistance RX1 and resistance R5, the first end of the first end contact resistance R2 of adjustable resistance RX1, the first end of resistance R2 connects the adjustable side of adjustable resistance RX1 simultaneously, the first end of the second end contact resistance R5 of adjustable resistance RX1, second end of the second end contact resistance R2 of resistance R5.
Concrete, described adjustable resistance unit also comprises electric capacity C8, the first end of the first end contact resistance R5 of electric capacity C8, the second end ground connection of electric capacity C8.
Concrete, described step-down conversion chip is the VREG5 end of TPS54327, TPS54327 is VREG end.
To sum up, adopt of the present invention provide realize the adjustable decompression converting circuit of voltage, by regulating the adjustable resistance RX1 of adjustable resistance unit, change the output voltage of step-down conversion chip, thus realizing the stable output of different target voltage, the described adjustable decompression converting circuit of voltage that realizes has practicality widely, not only can facilitate the exploitation mode of circuit board, output voltage fine setting can also be realized, avoid chip to work under overvoltage condition or under-voltage condition.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 be the embodiment of the present invention provide realize the adjustable decompression converting circuit figure of voltage.
Embodiment
Hereinafter with reference to accompanying drawing, described in detail by way of example and provided by the inventionly a kind ofly realize the adjustable decompression converting circuit of voltage.It should be noted that at this, the explanation for these way of example understands the present invention for helping, but does not form limitation of the invention.
Various technology described herein may be used for but is not limited to circuit board development field, can also be used for other similar field.
Term "and/or" herein, it is only a kind of incidence relation describing affiliated partner, three kinds of relations can be there are in expression, such as, A and/or B, can represent: individualism A, individualism B, there are A and B tri-kinds of situations simultaneously, herein term " or/and " be describe another kind of affiliated partner relation, can there are two kinds of relations in expression, such as, A is or/and B, can represent: individualism A, individualism A and B two kinds of situations, in addition, character "/" herein, general expression forward-backward correlation is to liking a kind of "or" relation.
What embodiment one, Fig. 1 showed that the present embodiment provides realizes the adjustable decompression converting circuit figure of voltage.Describedly realize the adjustable decompression converting circuit of voltage, it is characterized in that, comprising: step-down conversion chip, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, inductance L 1, polar capacitor PC1, polar capacitor PC2, polar capacitor PC3 and resistance adjustment unit, the EN of step-down conversion chip holds the first end of contact resistance R1, second end of resistance R1 connects direct voltage source VCC, the VFB of step-down conversion chip holds the first end of contact resistance R2 and the first end of resistance R3, the second end ground connection of resistance R3, the VREG end of step-down conversion chip connects the first end of electric capacity C1, second termination of electric capacity C1, the SS end of step-down conversion chip connects the first end of electric capacity C2, the second end ground connection of electric capacity C2, the VIN end of step-down conversion chip connects first end and the direct voltage source VCC of electric capacity C3, the second end ground connection of electric capacity C3, the anode of polar capacitor PC1 connects the first end of electric capacity C3, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C3, the minus earth of polar capacitor PC2, the VBST end of step-down conversion chip connects the first end of electric capacity C4, the SW end of step-down conversion chip connects second end of electric capacity C4, second end of electric capacity C4 connects the first end of inductance L 1 simultaneously, second end of inductance L 1 connects the first end of electric capacity C5 and second end of resistance R2, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5, the anode of polar capacitor PC3 connects the first end of electric capacity C5, the minus earth of polar capacitor PC3, the first end of the first end of electric capacity C5 contact resistance R4 simultaneously, second end of resistance R4 connects voltage output end VDD, resistance adjustment unit is connected in parallel on the two ends of resistance R2.Describedly realize in the adjustable decompression converting circuit of voltage, the input voltage of different range is down to an at particular voltage level for realizing by step-down conversion chip, the parallel resistance of resistance R3 and resistance R2 and resistance adjustment unit carries out dividing potential drop to feature magnitude of voltage, makes the magnitude of voltage of final voltage output end VDD to be:
In formula, k is the parameter of step-down conversion chip, and the type of step-down conversion chip is different, and k value is also different, R
resistance adjustment unitfor the instant resistance of resistance adjustment unit.When the parameter of resistance R2 and resistance R3 is determined, the voltage of described voltage output end VDD depends on the time resistance of resistance adjustment unit, by the resistance of adjusting resistance adjustment unit, can realize voltage output end VDD and export different magnitudes of voltage.
Concrete, described adjustable resistance unit comprises adjustable resistance RX1 and resistance R5, the first end of the first end contact resistance R2 of adjustable resistance RX1, the first end of resistance R2 connects the adjustable side of adjustable resistance RX1 simultaneously, the first end of the second end contact resistance R5 of adjustable resistance RX1, second end of the second end contact resistance R2 of resistance R5.The instant resistance of described adjustable resistance unit is: R
resistance adjustment unit=RX1+R5, by the resistance of adjustment adjustable resistance RX1, can realize voltage output end VDD and export different magnitudes of voltage.
Concrete, described adjustable resistance unit also comprises electric capacity C8, the first end of the first end contact resistance R5 of electric capacity C8, the second end ground connection of electric capacity C8.Electric capacity C8, as shunt capacitance, avoids, in adjustable resistance RX1 adjustment process, occurring spuious high-frequency signal in resistance adjustment unit, avoids occurring that voltage exports unstable situation.
Concrete, described step-down conversion chip is the VREG5 end of TPS54327, TPS54327 is VREG end.The voltage of scope between 4.5 ~ 18V can be down at particular voltage level by described step-down conversion chip, and now k is 0.765.
Concrete, the described decompression converting circuit realizing voltage adjustable also comprises: electric capacity C7; Electric capacity C7 is connected in parallel on the two ends of resistance R2.Electric capacity C7 is used for the spuious high-frequency signal occurred in turning circuit, stabilizing circuit.
As what optimize, in the present embodiment, the supply power voltage of described direct voltage source VCC is 5V.The resistance of resistance R1 is 10K ohm, the resistance of resistance R2 is 91K ohm, the resistance of resistance R3 is 10K ohm, the resistance of resistance R4 is 10K ohm, the resistance of resistance R5 is 1K ohm, the capacitance of electric capacity C1 is 1 microfarad, the capacitance of electric capacity C2 is 0.1 microfarad, the capacitance of electric capacity C3 is 0.1 microfarad, the capacitance of electric capacity C4 is 0.1 microfarad, the capacitance of electric capacity C5 is 22 microfarads, the capacitance of electric capacity C6 is 22 microfarads, the capacitance of electric capacity C7 is at 22 pico farads, the capacitance of electric capacity C8 is 0.1 microfarad, the capacitance of polar capacitor PC1 is 10 microfarads, the capacitance of polar capacitor PC2 is 10 microfarads, the capacitance of polar capacitor PC3 is 100 microfarads, the inductance value of inductance L 1 is 2.2 microhenrys, the adjustable extent of adjustable resistance RX1 is 0 ~ 100K ohm.In the present embodiment, the adjustable voltage scope of voltage output end VDD is: 0.84 ~ 4.43V, can meet the power demands of most chip, and can finely tune output voltage, avoids chip to work under overvoltage condition or under-voltage condition.
What the present embodiment provided realizes the adjustable decompression converting circuit of voltage, by regulating the adjustable resistance RX1 of adjustable resistance unit, change the output voltage of step-down conversion chip, thus realize the stable output of different target voltage, the described adjustable decompression converting circuit of voltage that realizes has practicality widely, not only can facilitate the exploitation mode of circuit board, output voltage fine setting can also be realized, avoid chip to work under overvoltage condition or under-voltage condition.
As mentioned above, the present invention can be realized preferably.For a person skilled in the art, according to instruction of the present invention, designing the multi-form decompression converting circuit realizing voltage adjustable does not need performing creative labour.Without departing from the principles and spirit of the present invention these embodiments changed, revise, replace, integrate and modification still falls within the scope of protection of the present invention.
Claims (6)
1. realize the decompression converting circuit that voltage is adjustable, it is characterized in that, comprising: step-down conversion chip, resistance R1, resistance R2, resistance R3, resistance R4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6, inductance L 1, polar capacitor PC1, polar capacitor PC2, polar capacitor PC3 and resistance adjustment unit;
The EN of step-down conversion chip holds the first end of contact resistance R1, second end of resistance R1 connects direct voltage source VCC, the VFB of step-down conversion chip holds the first end of contact resistance R2 and the first end of resistance R3, the second end ground connection of resistance R3, the VREG end of step-down conversion chip connects the first end of electric capacity C1, second termination of electric capacity C1, the SS end of step-down conversion chip connects the first end of electric capacity C2, the second end ground connection of electric capacity C2, the VIN end of step-down conversion chip connects first end and the direct voltage source VCC of electric capacity C3, the second end ground connection of electric capacity C3, the anode of polar capacitor PC1 connects the first end of electric capacity C3, the minus earth of polar capacitor PC1, the anode of polar capacitor PC2 connects the first end of electric capacity C3, the minus earth of polar capacitor PC2, the VBST end of step-down conversion chip connects the first end of electric capacity C4, the SW end of step-down conversion chip connects second end of electric capacity C4, second end of electric capacity C4 connects the first end of inductance L 1 simultaneously, second end of inductance L 1 connects the first end of electric capacity C5 and second end of resistance R2, the second end ground connection of electric capacity C5, the two ends shunt capacitance C6 of electric capacity C5, the anode of polar capacitor PC3 connects the first end of electric capacity C5, the minus earth of polar capacitor PC3, the first end of the first end of electric capacity C5 contact resistance R4 simultaneously, second end of resistance R4 connects voltage output end VDD,
Resistance adjustment unit is connected in parallel on the two ends of resistance R2.
2. realize the adjustable decompression converting circuit of voltage as claimed in claim 1, it is characterized in that, comprising:
Described adjustable resistance unit comprises adjustable resistance RX1 and resistance R5, the first end of the first end contact resistance R2 of adjustable resistance RX1, the first end of resistance R2 connects the adjustable side of adjustable resistance RX1 simultaneously, the first end of the second end contact resistance R5 of adjustable resistance RX1, second end of the second end contact resistance R2 of resistance R5.
3. realize the adjustable decompression converting circuit of voltage as claimed in claim 2, it is characterized in that:
Described adjustable resistance unit also comprises electric capacity C8, the first end of the first end contact resistance R5 of electric capacity C8, the second end ground connection of electric capacity C8.
4. realize the adjustable decompression converting circuit of voltage as claimed in claim 1, it is characterized in that:
Described step-down conversion chip is the VREG5 end of TPS54327, TPS54327 is VREG end.
5. realize the adjustable decompression converting circuit of voltage as claimed in claim 1, it is characterized in that, the described decompression converting circuit realizing voltage adjustable also comprises: electric capacity C7;
Electric capacity C7 is connected in parallel on the two ends of resistance R2.
6. realize the adjustable decompression converting circuit of voltage as claimed in claim 1, it is characterized in that, described in:
The supply power voltage of described direct voltage source VCC is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410679992.5A CN104467409B (en) | 2014-11-24 | 2014-11-24 | Voltage reduction conversion circuit achieving adjustable voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410679992.5A CN104467409B (en) | 2014-11-24 | 2014-11-24 | Voltage reduction conversion circuit achieving adjustable voltage |
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| CN104467409A true CN104467409A (en) | 2015-03-25 |
| CN104467409B CN104467409B (en) | 2017-05-03 |
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| CN201410679992.5A Active CN104467409B (en) | 2014-11-24 | 2014-11-24 | Voltage reduction conversion circuit achieving adjustable voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808730A (en) * | 2015-04-10 | 2015-07-29 | 惠州Tcl移动通信有限公司 | Control method and system for output voltage of mobile terminal and power supply management chip thereof |
| CN116087747A (en) * | 2022-12-28 | 2023-05-09 | 中科可控信息产业有限公司 | Single board testing circuit and method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203301362U (en) * | 2013-06-27 | 2013-11-20 | 黄月华 | High-efficiency, large-power and adjustable stabilized power supply |
| CN203660881U (en) * | 2013-12-30 | 2014-06-18 | 武汉凡谷电子技术股份有限公司 | Buck conversion power supply with linearly adjustable output voltage |
| CN204258627U (en) * | 2014-11-24 | 2015-04-08 | 成都盛军电子设备有限公司 | A kind of adjustable decompression converting circuit |
-
2014
- 2014-11-24 CN CN201410679992.5A patent/CN104467409B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808730A (en) * | 2015-04-10 | 2015-07-29 | 惠州Tcl移动通信有限公司 | Control method and system for output voltage of mobile terminal and power supply management chip thereof |
| CN116087747A (en) * | 2022-12-28 | 2023-05-09 | 中科可控信息产业有限公司 | Single board testing circuit and method |
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| CN104467409B (en) | 2017-05-03 |
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