CN104660037A - Low ripple power supply for high precision data acquisition system - Google Patents
Low ripple power supply for high precision data acquisition system Download PDFInfo
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- CN104660037A CN104660037A CN201310601167.9A CN201310601167A CN104660037A CN 104660037 A CN104660037 A CN 104660037A CN 201310601167 A CN201310601167 A CN 201310601167A CN 104660037 A CN104660037 A CN 104660037A
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Abstract
The invention discloses a low ripple power supply for a high precision data acquisition system. The low ripple power supply needed by the high precision data acquisition system has the advantages of low ripple and noise. The low ripple power supply needed by the high precision data acquisition system is researched and designed. After the work principles of a switch voltage stabilization power supply and a linear voltage stabilization power supply are analyzed, the switch power supply and the linear power supply are in two-level series connection to reduce ripples. An LM25576 switch voltage stabilization chip of the TI (Texas Instruments) and LT3083 and LT3015 low dropout voltage linear voltage stabilization chips of the Linear Technology Corporation are selected to design a low ripple power supply system.
Description
Technical field
What the present invention relates to is a kind of power supply, is particularly applied to the low ripple power supply in High Precise Data Acquisition System.
Background technology
Collection of simulant signal quantizes the electrical signal status of various transducer or monitored object, the process that the data format conventionally recording and analyze is organized.Signals collecting is the indispensable visual plants in field such as automatic job in all trades and professions such as Aeronautics and Astronautics, navigation, industrial automation, environmental engineering, traffic, the energy, safety guarantee, equipment dependability monitoring.Along with the raising to automation, reliability requirement, the development of sensor technology, signal transacting and analysis ability improve, and also improve the accuracy requirement of collected rear data thereupon.In aviation, navigation industry, to reliability and precision requirement far above other industry.Meanwhile, along with the development of modern communication technology, require that the working band of system is wider, conversion speed is faster, sampling rate is higher, and these are all had higher requirement to signal transacting front end data acquisition system.
For the data processing chip in data acquisition system, chip internal digital circuit, at ceaselessly switch on and off, result in the change of corresponding supply current.Along with the frequency of digital device improves constantly, corresponding current break also can become more fast with frequent.When current break, if electric power system can not make response in time, then spread of voltage may be caused, thrashing.
In order to ensure programmable gate array in data acquisition system (FPGA), device such as modulus (A/D) conversion chip and operational amplifier etc. normally can work and have higher reliability, must provide that a wide dynamic range adapted with it, power output are large, the electric power system of high efficiency and high stability.High efficiency makes switch power technology obtain huge development, and miniaturized requirement makes the switching frequency straight line of Switching Power Supply rise.But anything has its dual character, the while of providing more high efficiency, the restriction because of its operation principle creates more noise and electromagnetic interference.
Linear stabilized power supply has good dynamic property and lower ripple, noise.The efficiency of linear stabilized power supply is substantially equal to the ratio of constrained input voltage.If input, output voltage difference are comparatively large, the efficiency of linear voltage regulator can not put up with.
Summary of the invention
The object of this invention is to provide a kind of dynamic property good and have the low ripple power supply needed for High Precise Data Acquisition System of lower ripple, noise.
The object of the present invention is achieved like this:
A kind of High Precise Data Acquisition System low ripple power supply, its composition Switching Power Supply and linear power supply, wherein selected LT3083 and the LT3015 low pressure difference linearity voltage stabilizing chip design of the LM25576 switching regulator IC of Texas Instrument TI and Linear Techn Inc. to go out low ripple power-supply system.
Described High Precise Data Acquisition System low ripple power supply, is characterized in that the printed circuit board (PCB) of described power-supply system adopts four laminate designs.
Carry out studying and designing for the low ripple power supply needed for High Precise Data Acquisition System.After the operation principle of switching power supply and linear stabilized power supply is analyzed, propose the scheme of Switching Power Supply and linear power supply two-stage series connection reduction ripple, select LT3083 and the LT3015 low pressure difference linearity voltage stabilizing chip design of the LM25576 switching regulator IC of Texas Instrument (TI) and Linear Techn Inc. to go out low ripple power-supply system.
In order to obtain good electric property and heat dispersion, the printed circuit board (PCB) of power-supply system of the present invention adopts four laminate designs.Path, ground adopts ground level design, to reduce ground level path impedance.In order to reduce the interference of each intermodule, carried out piecemeal process to the ground level of each module, all ground levels are drawn from single-point.Supply path adopts same processing mode single-point to draw.In order to reduce high-frequency noise, near each chip, there is capacitor decoupling.Circuit board inside is used alone one deck and applies copper and carry out heat conduction, is connected to the louvre of board edge.
Advantage of the present invention: propose the form adopting two-stage power sources in series in the present invention.Front level power supply uses switching power supply to carry out pre-voltage stabilizing, to realize high efficiency voltage transitions; Rear level power supply uses low pressure difference linearity stabilized voltage power supply (LDO), makes full use of the high PSRR characteristic of LDO to reduce the Ripple Noise of the pre-voltage of voltage regulation of prime.Realize the low ripple index of power-supply system, can good dynamic property be obtained simultaneously.
Accompanying drawing explanation
Fig. 1 is system construction drawing.
Embodiment
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
A kind of High Precise Data Acquisition System low ripple power supply, its composition Switching Power Supply and linear power supply, wherein selected LT3083 and the LT3015 low pressure difference linearity voltage stabilizing chip design of the LM25576 switching regulator IC of Texas Instrument TI and Linear Techn Inc. to go out low ripple power-supply system.
It is characterized in that the printed circuit board (PCB) of described power-supply system adopts four laminate designs.
Composition graphs 1, Fig. 1 is the structure chart of system.Switch voltage-stabilizing part adopts the LM25576 step-down switching regulator of Texas Instrument.LM25576 is a wieldy voltage-releasing voltage stabilizer, and input voltage range is 6-42V.The continuous current of 3A is exported by the 170m Ω N-channel MOS FET that inside is integrated.Operating frequency is adjustable in 50kHz to 1MHz, to realize size and efficiency optimization.For reducing electromagnetic interference (EMI), the Frequency Synchronization pin of LM25576 allows multiple IC motor synchronizing or and external clock.Its reliability is ensured by measures such as Cycle by Cycle current limliting, short-circuit protection, Thermal shutdown and remote shutdown.Device adopts power enhancement mode TSSOP-20 encapsulation, and bottom it, the bareing of promising heat dissipation design connects pad.This device is applicable to the power bus voltage scope of telecommunications, industry and automobile very much.
LT3083 is the mono-resistor low pressure difference linear voltage regulator of adjustable 3A.There is following features: can output-parallel to provide higher electric current and heat dissipation capacity, output current: 3A, by single resistor, output voltage is set, 50 μ A SET pin electric currents: 1% initial accuracy, output can be adjusted to 0V, low output noise: 40 μ V_RMS (10kHz to 100kHz), wide input voltage range: 1.2V to 23V, low drop voltage: 310mv is less than 1mV adjustment of load, be less than 0.001%/V voltage regulation, minimum load current: 1mA, adopt during the 10 minimum ceramic capacitor of μ F and can realize stablizing, there is the current limit and overtemperature protection of turning back.
LT3015 is the negative pressurizer of low noise that 1.5A electric current exports.Its feature is as follows: output current: 1.5A, dropout voltage: 310mV, the accurate current limit that tool is turned back, low output noise: 60 μ V_RMS (10Hz to 100kHz), low quiescent current: 1.1mA, accurate plus or minus shuts down logic, fast transient response, wide input voltage range :-1.8V to-30V, adjustable output voltage scope :-1.22V to-29.3V, under pressure differential, quiescent current is in slave mode, quiescent current <1 μ A in shutdown mode, adopt during 10 μ F output capacitor and can realize stablizing, the thermal limit of tool sluggishness, reverse output protection.
Claims (2)
1. a High Precise Data Acquisition System low ripple power supply, its composition Switching Power Supply and linear power supply, wherein selected LT3083 and the LT3015 low pressure difference linearity voltage stabilizing chip design of the LM25576 switching regulator IC of Texas Instrument TI and Linear Techn Inc. to go out low ripple power-supply system.
2. High Precise Data Acquisition System low ripple power supply according to claim 1, is characterized in that the printed circuit board (PCB) of described power-supply system adopts four laminate designs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310601167.9A CN104660037A (en) | 2013-11-25 | 2013-11-25 | Low ripple power supply for high precision data acquisition system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310601167.9A CN104660037A (en) | 2013-11-25 | 2013-11-25 | Low ripple power supply for high precision data acquisition system |
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| CN104660037A true CN104660037A (en) | 2015-05-27 |
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| CN201310601167.9A Pending CN104660037A (en) | 2013-11-25 | 2013-11-25 | Low ripple power supply for high precision data acquisition system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953803A (en) * | 2015-07-06 | 2015-09-30 | 中国海洋石油总公司 | Power supply for ultrasonic phased array well wall imaging system |
| CN106712516A (en) * | 2017-02-17 | 2017-05-24 | 西安科技大学 | Two-stage voltage stabilization regulating circuit and voltage stabilization method and design method thereof |
| CN115047933A (en) * | 2022-06-14 | 2022-09-13 | 西安深瞳智控技术有限公司 | Dual-power supply device and method suitable for low-noise non-isolated analog-digital hybrid system |
-
2013
- 2013-11-25 CN CN201310601167.9A patent/CN104660037A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953803A (en) * | 2015-07-06 | 2015-09-30 | 中国海洋石油总公司 | Power supply for ultrasonic phased array well wall imaging system |
| CN104953803B (en) * | 2015-07-06 | 2018-04-17 | 中国海洋石油总公司 | Ultrasonic phase array borehole wall imaging system power supply |
| CN106712516A (en) * | 2017-02-17 | 2017-05-24 | 西安科技大学 | Two-stage voltage stabilization regulating circuit and voltage stabilization method and design method thereof |
| CN106712516B (en) * | 2017-02-17 | 2023-12-19 | 北京阿尔泰科技发展有限公司 | Two-stage voltage stabilizing and regulating circuit, voltage stabilizing method and design method thereof |
| CN115047933A (en) * | 2022-06-14 | 2022-09-13 | 西安深瞳智控技术有限公司 | Dual-power supply device and method suitable for low-noise non-isolated analog-digital hybrid system |
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Application publication date: 20150527 |