CN110071629A - A kind of high-precision low noise power supply design method - Google Patents
A kind of high-precision low noise power supply design method Download PDFInfo
- Publication number
- CN110071629A CN110071629A CN201910485992.4A CN201910485992A CN110071629A CN 110071629 A CN110071629 A CN 110071629A CN 201910485992 A CN201910485992 A CN 201910485992A CN 110071629 A CN110071629 A CN 110071629A
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- China
- Prior art keywords
- power supply
- low noise
- design method
- precision low
- noise power
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
Abstract
The invention discloses a kind of high-precision low noise power supply design methods to realize the efficient balance of circuit efficiency and performance the features such as using the power supply structure of DC-DC power source and LDO combination, make full use of the high efficiency and LDO low ripple noise of DC-DC power source.After bus power input, input voltage can be changed into the secondary voltage that a little higher than system needs with efficient DC-DC circuit, then power supply needed for secondary voltage is changed into system by LDO.
Description
Technical field
The present invention relates to battery management technique more particularly to a kind of high-precision low noise power supply design methods.
Background technique
With the development of technology, portable device is set to diversification and intelligent development by embedded unification before
The integrated direction development of various modules is counted, this requires the load capacity of battery, cruising ability and low noise to bring difficulty
Degree.Although power supply is also rapidly developing, compared with the development of intelligent portable equipment or fall behind, in addition every profession and trade is to production
Product it is intelligent and it is integrated require higher and higher, measurement accuracy requirement, the requirement to power source performance and noise is also higher and higher.
Therefore, it in existing design basis, improves power-efficient and performance is the skill that portable industry is increasingly paid attention to
Art.
Summary of the invention
In view of the above-mentioned problems of the prior art, the present invention provides a kind of high-precision low noise power supply design method.
The present invention solves technical problem and adopts the following technical scheme that a kind of high-precision low noise power supply design method, including
The power supply structure combined using DC-DC power source+LDO, makes full use of high efficiency and LDO low ripple noise of DC-DC power source etc. special
Point realizes the efficient balance of circuit efficiency and performance.It, can be with efficient DC-DC circuit by input voltage after bus power input
The secondary voltage that a little higher than system needs is changed into, then power supply needed for secondary voltage is changed into system by LDO.
Optionally, the DC-DC power source is selected LT1377 as 28V, ± 15V ,+5V and+3.3V power supply chip, is passed through
It configures different feedback resistances and obtains required voltage；Select power management chip of the A CT8945AQJ405 as ARM MCU.
One of conventional boost adjuster is common problem encountered is that even if PWM switch is closed, from the conducting path for being input to output.It can be generated
Three problems, surge current when starting, the leakage voltage and unconfined short circuit current that when shutdown exports.
Optionally, the TPS61080/1 uses the Controlled in Current Mode and Based of constant PWM (pulsewidth modulation) frequency.Switching frequency
It can be 600KHz or 1.2MHz by FSW pin configuration.600KHz improves light-load efficiency, and 1.2MHz allows using smaller
Outer member.PWM switch is opened in PWM operation when each switch periods start.Input voltage is applied on inductor, and in electricity
Storage energy when sensor electric current increases.Load current is provided by output capacitance.It crosses over when inductive current and is exported by error amplifier
When the threshold value of setting, PWM switch OFF, power diode forward bias.Inductor transmits the energy of its storage to supplement output
Capacitor.The operation repeats in next switch periods.
Optionally, the cabling short using wide for high current path and power ground.Input capacitance not only needs close
VIN, it is also necessary to close to GND pin, to reduce the voltage ripple that IC sees.L and SW pin is conveniently located at the edge of IC, therefore
Inductance can be placed close to IC.Output capacitance needs to place close to load, to reduce ripple and to the maximum extent to the maximum extent
Improve mapping.
Detailed description of the invention
Fig. 1 is a kind of high-precision low noise power supply design method schematic diagram of the present invention；
Fig. 2 is a kind of input circuit implementation diagram of high-precision low noise power supply design method of the invention；
Wherein, Vin: input voltage, Vout: output voltage, DC-DC DC-DC, High efficiency: efficiently
Rate, Low ripple noise: low ripple noise, STM32processor superior:STM32 processor management system
System.
Fig. 3 is that a kind of of the invention power path management circuit implementation of high-precision low noise power supply design method is shown
It is intended to；
Fig. 4 is a kind of single-chip microcontroller control implementation diagram of high-precision low noise power supply design method of the invention；
Specific embodiment
Technical solution of the present invention is further elaborated below with reference to examples and drawings.
The present invention provides a kind of high-precision low noise power supply design method, as shown in Figure 1, it uses DC-DC power source and LDO
Combined power supply structure, the features such as making full use of the high efficiency and LDO low ripple noise of DC-DC power source, realize circuit efficiency and
The efficient balance of performance.After bus power input, input voltage can be changed into a little higher than system needs with efficient DC-DC circuit
Secondary voltage, then power supply needed for secondary voltage is changed into system by LDO.
In this high-precision low noise power supply design method, battery dynamic route management and control device selects LT1377 conduct
28V, ± 15V ,+5V and+3.3V power supply chip obtain required voltage by the feedback resistance for configuring different；Select A
Power management chip of the CT8945AQJ405 as ARM MCU.
And TPS61080/1 uses the Controlled in Current Mode and Based of constant PWM (pulsewidth modulation) frequency.Switching frequency can pass through
FSW pin configuration is 600KHz or 1.2MHz.Wherein, 600KHz improves light-load efficiency, and 1.2MHz allows using smaller
Outer member.PWM switch is opened in PWM operation when each switch periods start.Input voltage is applied on inductor, and in electricity
Storage energy when sensor electric current increases.Load current is provided by output capacitance.It crosses over when inductive current and is exported by error amplifier
When the threshold value of setting, PWM switch OFF, power diode forward bias.Inductor transmits the energy of its storage to supplement output
Capacitor.The operation repeats in next switch periods.
When inductive current is more than 2ms lower than VIN-1.4V more than 13 μ s or OUT pin voltages more than short circuit current limitation
When, trigger the circuit.Internal clamping diodes conducting between L pin and ground, provides current discharge path for inductance.
Since the selection of inductor influences steady state operation, transient performance and loop stability, so inductor is power tune
Save most important component in device design.There are three important inductance specification, inductance value, D.C. resistance and saturation currents.
The inductance value of inductance determines inductance ripple current.Usually suggest setting DC current for peak-to-peak value ripple current
30-40%.
In addition, capacitor is primarily selected as meeting output ripple and loop stability requirement out.The ripple voltage and capacitor
Capacitor and equivalent series resistance (ESR) are related.During load transient, the output capacitance of boost converter output must be in electricity
Transient current is supplied or absorbed to inducing current before increasing its steady-state value.During load transient, biggish capacitor is always helped
In the voltage for reducing high pressure and low pressure.Bigger capacitor also contributes to loop stability.
The cabling short using wide for high current path and power ground.Input capacitance not only needs also to need close to VIN
It will be close to GND pin, to reduce the voltage ripple that IC sees.L and SW pin is conveniently located at the edge of IC, therefore inductance can be with
It is placed close to IC.Output capacitance needs to place close to load, to reduce ripple to the maximum extent and improve transient state to the maximum extent
Performance.
It is public using one for all power grounds for being connected to PGND pin in order to minimize the influence of ground noise
Node, and different ground is connected to GND pin.Two ground nodes are linked together at load, GND can be made in this way
Pin realizes good DC adjustment close to output ground.Any voltage difference between the two nodes can all pass through output end
Feedback loop divider obtains.Due to there is high current between them, the close ground and PGND of output capacitance is also beneficial.
Case study on implementation
Present embodiments provide a kind of high-precision low noise power supply design method.- 4 it show height in the application referring to fig. 2
The specific embodiment of precision low noise power supply design method, comprising:
Fig. 2 input circuit, for different acquisition signals, such as the good thermal simulation signal of digital signal, using different power supplies
Circuit, digital power system (Digital power) and simulation power supply (Analog power).In addition, exported for each DC/DC,
By Measures V/I 12C BUS, signal is fed back into STM32Processor superior, is managed, in turn
DC/DCin is controlled, closed loop is formed.
Fig. 3 power path management circuit selects LT1377 as 28V, ± 15V ,+5V and+3.3V power supply chip, by matching
It sets different feedback resistances and obtains required voltage；And select A CT8945AQJ405 as the power management chip of ARM MCU.
Fig. 4 single chip machine controlling circuit, SN65HVD01 are a low-power consumption, 250ksps or 20Mbps data rate is optional
RS-485 transceiver, this transceiver is used for data and enable signal using 1.65V to 3.6V power supply, and uses for bus signals
One ± 10% power supply of 3.3V.This device is designed to require the application of synchronous (parallel transceiver) signal sequence.On piece wink
State inhibits this device of protection not influenced and damaged by IEC61000 static discharge (ESD) and electric fast transient (EFT) transient state.This
Combination of devices has a differential driver and a differential receiver, these devices are suitable for half by inside connection to form one
The bus port of duplexing (two-wire system bus) communication.The peculiar wide common-mode voltage range of this device, this is suitble to this device
Multipoint application in the operation of long cable.SN65HVD01 uses minimal type, 3mm x 3mm, SON encapsulation, temperature range of operation-
40 DEG C to 125 DEG C.
Claims (9)
1. a kind of high-precision low noise power supply design method, which is characterized in that the power bay combined using DC-DC power source and LDO
Input voltage after bus power input, the secondary voltage 0V-1V needed higher than system is changed into using DC-DC circuit, then will by structure
Power supply needed for secondary voltage changes into system by LDO.
2. high-precision low noise power supply design method according to claim 1, which is characterized in that the dynamic road of the battery
Diameter management and control device selects LT1377 as 28V, ± 15V ,+5V and+3.3V power supply chip, by configuring different feedbacks
Resistance obtains required voltage；And select A CT8945AQJ405 as the power management chip of ARM MCU.
3. high-precision low noise power supply design method according to claim 1, which is characterized in that the battery dynamic route
Management and control device, TPS61080/1 use the Controlled in Current Mode and Based of constant PWM (pulsewidth modulation) frequency；Switching frequency can lead to
Crossing FSW pin configuration is 600KHz or 1.2MHz.
4. high-precision low noise power supply design method according to claim 3, which is characterized in that PWM operation is opened each
PWM switch is opened when the pass period starts, input voltage is applied on inductor, and the storage energy when inductor current increases；
Load current is provided by output capacitance；
When inductive current crosses over the threshold value by error amplifier output setting, PWM switch OFF, power diode forward bias
It sets, inductor transmits the energy of its storage to supplement output capacitor, which repeats in next switch periods.
5. high-precision low noise power supply design method according to claim 3, which is characterized in that TPS61080/1 is closed
Isolation FET between input and inductance；
When inductive current is more than that short circuit current limitation is more than 2ms lower than VIN-1.4V more than 13 μ s or OUT pin voltages, touching
Send out the circuit；
Internal clamping diodes conducting between L pin and ground, provides current discharge path for inductance.
6. high-precision low noise power supply design method according to claim 5, which is characterized in that the inductance value of inductance determines
Inductance ripple current usually suggests the 30-40% for setting peak-to-peak value ripple current to DC current.
7. high-precision low noise power supply design method according to claim 6, which is characterized in that go out capacitor in load transient
Transient state electricity must be supplied before inductive current increases its steady-state value or be absorbed to period, the output capacitance of boost converter output
Stream.
8. high-precision low noise power supply design method according to claim 7, which is characterized in that draw for being connected to PGND
All power grounds of foot use a common node, and different ground is connected to GND pin；Two ground connection are saved at load
Point links together, and any voltage difference between the two nodes can all be obtained by the feedback loop divider of output end.
9. high-precision low noise power supply design method according to claim 1, which is characterized in that utilize DC-DC circuit will
Input voltage changes into the secondary voltage 0V-0.5V needed higher than system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910485992.4A CN110071629A (en) | 2019-06-05 | 2019-06-05 | A kind of high-precision low noise power supply design method |
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| CN201910485992.4A CN110071629A (en) | 2019-06-05 | 2019-06-05 | A kind of high-precision low noise power supply design method |
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Citations (7)
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| CN1787348A (en) * | 2005-12-16 | 2006-06-14 | 中国科学院上海光学精密机械研究所 | Low input voltage switch converter |
| US20090219004A1 (en) * | 2008-02-28 | 2009-09-03 | Fujitsu Mecroelectronics Limited | Power supply control device and power supply control method |
| KR20120056456A (en) * | 2010-11-25 | 2012-06-04 | 삼성모바일디스플레이주식회사 | DC-DC Converter |
| CN102664519A (en) * | 2012-05-30 | 2012-09-12 | 无锡德思普科技有限公司 | Low-noise wide-range heavy-current battery simulation device |
| CN203325173U (en) * | 2013-01-25 | 2013-12-04 | 珠海中慧微电子有限公司 | Intelligent watt-hour meter wireless communication module |
| CN205196030U (en) * | 2015-10-28 | 2016-04-27 | 阮涛 | Microwave controlling means |
| CN107425719A (en) * | 2017-09-18 | 2017-12-01 | 矽力杰半导体技术(杭州)有限公司 | A kind of power supply changeover device |
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2019
- 2019-06-05 CN CN201910485992.4A patent/CN110071629A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787348A (en) * | 2005-12-16 | 2006-06-14 | 中国科学院上海光学精密机械研究所 | Low input voltage switch converter |
| US20090219004A1 (en) * | 2008-02-28 | 2009-09-03 | Fujitsu Mecroelectronics Limited | Power supply control device and power supply control method |
| KR20120056456A (en) * | 2010-11-25 | 2012-06-04 | 삼성모바일디스플레이주식회사 | DC-DC Converter |
| CN102664519A (en) * | 2012-05-30 | 2012-09-12 | 无锡德思普科技有限公司 | Low-noise wide-range heavy-current battery simulation device |
| CN203325173U (en) * | 2013-01-25 | 2013-12-04 | 珠海中慧微电子有限公司 | Intelligent watt-hour meter wireless communication module |
| CN205196030U (en) * | 2015-10-28 | 2016-04-27 | 阮涛 | Microwave controlling means |
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Application publication date: 20190730 |
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