CN109347321A - A kind of DC-DC Switching Power Supply of high transformation efficiency - Google Patents
A kind of DC-DC Switching Power Supply of high transformation efficiency Download PDFInfo
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- CN109347321A CN109347321A CN201811358320.9A CN201811358320A CN109347321A CN 109347321 A CN109347321 A CN 109347321A CN 201811358320 A CN201811358320 A CN 201811358320A CN 109347321 A CN109347321 A CN 109347321A
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- 230000009466 transformation Effects 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 73
- 230000005611 electricity Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of DC-DC Switching Power Supplies of high transformation efficiency, include chip U5, 1 foot connection one end resistance R38 of U5 and the one end resistance R40, resistance R38 other end ground connection, 8 feet of resistance R40 other end connection U5, 8 feet of U5 are also connected with the one end capacitor C148, the one end capacitor C149 and the one end capacitor C150, the capacitor C148 other end, the capacitor C149 other end and capacitor C150 other end ground connection, 2 feet connection one end resistance R35 of U5 and the one end resistance R37, resistance R37 other end ground connection, 3 feet of U5 connect the one end capacitor C161, capacitor C161 other end ground connection, 4 feet of U5 connect the one end capacitor C162, capacitor C162 other end ground connection, 7 feet of U5 connect the one end capacitor C152.The configuration of the present invention is simple, cost is relatively low, and high conversion efficiency.
Description
Technical field
The present invention relates to a kind of Switching Power Supply, especially a kind of DC-DC Switching Power Supply of high transformation efficiency.
Background technique
Switched-mode power supply (Switch Mode Power Supply, abbreviation SMPS), also known as exchange type power, switch become
Parallel operation is a kind of high frequency device for converting electric energy, is one kind of power supply unit.Its function is by the voltage of a level, thoroughly
It crosses various forms of frameworks and is converted to the required voltage of user terminal or electric current.The input of Switching Power Supply is AC power source mostly
(such as alternating current) or DC power supply, and exporting is to need the equipment of DC power supply mostly, such as PC, and Switching Power Supply
With regard to carrying out the conversion of voltage and current between the two.
There are two types of modern Switching Power Supplies: one is direct-current switch power supplies；Another kind is alternating-current switch power supply.Here main to be situated between
The only direct-current switch power supply to continue, function are by the poor ecosystem power supply of power quality (thick electricity), such as mains supply or storage
Battery supply is converted into meeting the higher DC voltage of quality (essence electricity) of equipment requirement.The core of direct-current switch power supply is DC/
DC converter.Therefore the classification of direct-current switch power supply is to rely on DC/DC converter to classify.That is, direct-current switch power supply
Classification with the classification of DC/DC converter be it is essentially identical, the classification of DC/DC converter is basically direct-current switch power supply
Classification.
IC chip, which works normally, must stable power supply supply, and the especially core voltage of FPGA is had to
It aspires for stability, otherwise can burn out entire chip.And the prior art switching power supply structure is complicated and the power conversion rate that provides compared with
It is low.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of DC-DC Switching Power Supplies of high transformation efficiency.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of DC-DC Switching Power Supply of high transformation efficiency, it is characterised in that: include chip U5,1 foot of U5 connects resistance R38 mono-
End and the one end resistance R40, resistance R38 other end ground connection, the resistance R40 other end connect 8 feet of U5, and 8 feet of U5 are also connected with capacitor
The one end C148, the one end capacitor C149 and the one end capacitor C150, the capacitor C148 other end, the capacitor C149 other end and capacitor C150 are another
One end ground connection, 2 feet connection one end resistance R35 of U5 and the one end resistance R37,3 feet of resistance R37 other end ground connection, U5 connect electricity
Hold the one end C161, capacitor C161 other end ground connection, 4 feet of U5 connect the one end capacitor C162, and the capacitor C162 other end is grounded, U5's
7 feet connect the one end capacitor C152.
Further, the chip U5 is TPS54328 chip.
Further, 9 feet of the U5 and 5 feet ground connection.
Further, the 6 feet connection capacitor C152 other end of the U5 and the one end inductance L6, inductance L6 other end connection electricity
It is another to hinder the R35 other end, the one end capacitor C156, the one end capacitor C157, the one end capacitor C158 and the one end capacitor C65, capacitor C156
End, the capacitor C157 other end and capacitor C158 other end ground connection, the resistance R35 other end connect 1.5V power supply.
Compared with prior art, the present invention having the following advantages that and effect: the DC-DC switch of high transformation efficiency of the invention
Power supply architecture is simple, and cost is relatively low, and high conversion efficiency.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the DC-DC Switching Power Supply of high transformation efficiency of the invention.
Specific embodiment
Below by embodiment, the present invention is described in further detail, following embodiment be explanation of the invention and
The invention is not limited to following embodiments.
As shown in Figure 1, a kind of DC-DC Switching Power Supply of high transformation efficiency of the invention, includes TPS54328 chip U5, U5
1 foot connection one end the resistance R38 and one end resistance R40, resistance R38 other end ground connection, the resistance R40 other end connects 8 feet of U5,
8 feet of U5 are also connected with the one end capacitor C148, the one end capacitor C149 and the one end capacitor C150, the capacitor C148 other end, capacitor C149
The other end and capacitor C150 other end ground connection, 2 feet connection one end resistance R35 of U5 and the one end resistance R37, the resistance R37 other end
Ground connection, 3 feet of U5 connect the one end capacitor C161, and 4 feet of capacitor C161 other end ground connection, U5 connect the one end capacitor C162, capacitor
7 feet of C162 other end ground connection, U5 connect the one end capacitor C152.
9 feet of U5 and 5 feet ground connection, the 6 feet connection capacitor C152 other end of U5 and the one end inductance L6, the inductance L6 other end connect
The connecting resistance R35 other end, the one end capacitor C156, the one end capacitor C157, the one end capacitor C158 and the one end capacitor C65, capacitor C156
The other end, the capacitor C157 other end and capacitor C158 other end ground connection, the resistance R35 other end connect 1.5V power supply.
Chip of the invention uses TPS54328 chip, and the input voltage range of the chip is 4.5V ~ 18V, output voltage
Range is 0.765V ~ 7V, and electric current is only 10u A under high conversion efficiency standby mode.TPS54328 is remained to when light load
Keep high transformation efficiency.The chip allow POSCAP, SP-CAP etc. that output capacitance is low equivalent series resistance (ESR) and
The ceramic condenser of ultra-low equivalent series impedance (ESR).The chip also has adjustable soft-start time, and switching frequency is
700khz.This chip interior is integrated with the MOSFET of two N channels, further improves the transformation efficiency of chip.
The ratio of output node to divider resistance R35, R37 between VFB pin determine the size of output voltage,
Output voltage calculation formula: VOUT= 0.765×( 1+R35/R37)；Use such as formula VOUT = 0.765×( 1+R35/
R37) and the voltage value of required output calculates the ratio of two resistance.Resistance is selected according to the size of ratio, the present invention selects
The resistance of biggish resistance value improves transformation efficiency when light load, and resistance is higher to the quick of noise and output voltage error
Sensitivity is higher.Since all there is a certain error for resistance and reference voltage, as long as output voltage may deviate design value still
In the range of chip requires, in order to select output voltage closer to ideal value, very high node performance, when this design of node
It is 1% resistance with precision.
U5 chip output voltage needs to add input filter and storage capacitor, and the guarantee of these capacitors provides for this switch chip
The lesser power supply of stable clutter, the present invention realized using two 10u F and one 104 capacitor combination energy storage and
Filtering.
For the bootstrap capacitor for needing to add a 0.1u F between VBST and SW that normally works, in VREG5 and ground
Between increase the capacitor of a 1u F, the two capacitors use ceramic condenser.
U5 chip exports filtering using the mode of LC filtering, and inductance needs rule of thumb, to export the work of electric current and chip
Working frequency determines that output capacitance is also required to determine according to output voltage, output electric current.In the present invention, inductance is selected
1.5u H, the maximum current of permission are 3A, and output capacitance uses the capacitor of two 22u F and one 104 capacitor mutually to tie
Close the function of realizing energy storage filtering.Since chip interior integrates MOSFET, therefore external Schottky diode is not needed.Enable end
Directly VIN is divided to obtain, since U5 chip does not have the requirement of electrifying timing sequence, therefore does not need to go to control using the enable end
Electrifying timing sequence processed.Output voltage goes out to add a 0 Europe resistance for the ease of testing electric current etc. with convenient for debugging.
Above content is only illustrations made for the present invention described in this specification.Technology belonging to the present invention
The technical staff in field can do various modifications or supplement or is substituted in a similar manner to described specific embodiment, only
It should belong to guarantor of the invention without departing from the content or beyond the scope defined by this claim of description of the invention
Protect range.
Claims (4)
1. a kind of DC-DC Switching Power Supply of high transformation efficiency, it is characterised in that: include chip U5,1 foot of U5 connects resistance R38
One end and the one end resistance R40, resistance R38 other end ground connection, the resistance R40 other end connect 8 feet of U5, and 8 feet of U5 are also connected with electricity
Hold the one end C148, the one end capacitor C149 and the one end capacitor C150, the capacitor C148 other end, the capacitor C149 other end and capacitor C150
Other end ground connection, 2 feet connection one end resistance R35 of U5 and the one end resistance R37, resistance R37 other end ground connection, the 3 feet connection of U5
The one end capacitor C161, capacitor C161 other end ground connection, 4 feet of U5 connect the one end capacitor C162, capacitor C162 other end ground connection, U5
7 feet connect the one end capacitor C152.
2. a kind of DC-DC Switching Power Supply of high transformation efficiency described in accordance with the claim 1, it is characterised in that: the chip U5
For TPS54328 chip.
3. a kind of DC-DC Switching Power Supply of high transformation efficiency described in accordance with the claim 1, it is characterised in that: 9 feet of the U5
It is grounded with 5 feet.
4. a kind of DC-DC Switching Power Supply of high transformation efficiency described in accordance with the claim 1, it is characterised in that: 6 feet of the U5
The capacitor C152 other end and the one end inductance L6 are connected, the inductance L6 other end connects the resistance R35 other end, the one end capacitor C156, electricity
Hold the one end C157, the one end capacitor C158 and the one end capacitor C65, the capacitor C156 other end, the capacitor C157 other end and capacitor C158
Other end ground connection, the resistance R35 other end connect 1.5V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358320.9A CN109347321A (en) | 2018-11-15 | 2018-11-15 | A kind of DC-DC Switching Power Supply of high transformation efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811358320.9A CN109347321A (en) | 2018-11-15 | 2018-11-15 | A kind of DC-DC Switching Power Supply of high transformation efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109347321A true CN109347321A (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811358320.9A Pending CN109347321A (en) | 2018-11-15 | 2018-11-15 | A kind of DC-DC Switching Power Supply of high transformation efficiency |
Country Status (1)
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204538965U (en) * | 2015-04-14 | 2015-08-05 | 遵义师范学院 | A kind of DC-DC change-over circuit |
| CN207166356U (en) * | 2017-08-04 | 2018-03-30 | 北方智能装备有限公司 | A kind of DC D/C power conversion modules of high accuracy, low ripple |
-
2018
- 2018-11-15 CN CN201811358320.9A patent/CN109347321A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204538965U (en) * | 2015-04-14 | 2015-08-05 | 遵义师范学院 | A kind of DC-DC change-over circuit |
| CN207166356U (en) * | 2017-08-04 | 2018-03-30 | 北方智能装备有限公司 | A kind of DC D/C power conversion modules of high accuracy, low ripple |
Non-Patent Citations (1)
| Title |
|---|
| 德州仪器: "具有 Eco-mode 的 4.5V 至 18V 输入、3A 同步降压转换器", 《德州仪器》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190215 |