CN102761234A - High-efficiency and high-output quality power module suitable for portable data acquisition system - Google Patents
High-efficiency and high-output quality power module suitable for portable data acquisition system Download PDFInfo
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- CN102761234A CN102761234A CN2012102434769A CN201210243476A CN102761234A CN 102761234 A CN102761234 A CN 102761234A CN 2012102434769 A CN2012102434769 A CN 2012102434769A CN 201210243476 A CN201210243476 A CN 201210243476A CN 102761234 A CN102761234 A CN 102761234A
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Abstract
The invention discloses a high-efficiency and high-output quality power module suitable for a portable data acquisition system. A battery pack is connected with a 3V low-dropout voltage stabilizing circuit and a DC-DC boost-up transformation circuit, the DC-DC boost-up transformation circuit is connected with a 5V low-dropout voltage stabilizing circuit, the output of the 5V low-dropout voltage stabilizing circuit is connected with an analogue circuit part and supplies power for an analogue circuit, the 3V low-dropout voltage stabilizing circuit is connected with a digital circuit part and supplies power for a digital circuit, and a MCU(Microprogrammed Control Unit) controls the DC-DC boost-up transformation circuit and the 3V low-dropout voltage stabilizing circuit so as to control the power supply of the analogue part and the digital part. The novel power module in the invention can simultaneously supply power for the analogue circuit and the digital circuit, and respectively provides 5V and 3V voltage-stabilized power; the power module is low in power consumption, small in volume and high in power output quality, and the power output ripple is less than 2 millivolt.
Description
Technical field
What the present invention relates to is a kind of power module that is applicable to the high output quality of high efficiency of Portable Data-Acquisition System.
Background technology
Power module is an element in the instrument and meter, and it is responsible for the circuit part power supply of whole instrument.The output quality of power module, efficient direct relation the key property of whole instrument.The power supply output quality can guarantee the precision and the reliability of data acquisition system preferably; High conversion rate representes that system can utilize battery power largely, reduces the wastage, and prolongs battery service time.
Portable Data-Acquisition System has obtained extensive use as one type of specific apparatus of carrying out data acquisition at the scene in industrial measurement and control, Medical Instruments and consumer electronics product.Portable Data-Acquisition System need satisfy the requirement of little power consumption, microminiaturization and degree of precision in design.Power module is as the important component part of Portable Data-Acquisition System, and the quality of its design will directly influence the precision and the reliability of system.
In a Portable Data-Acquisition System, the design of power module need reach following designing requirement usually:
1) power module has higher output quality.Signal condition in the data acquisition system and high-accuracy data acquisition require high-quality power supply---and be that output ripple is little, voltage regulation result good.
2) power module has higher efficient and little power consumption characteristics.This will be directly connected to the up time of internal battery in the portable system.
3) power module can be supplied power to analog circuit and digital circuit simultaneously, and digital circuit can not passed through power circuit interference simulation circuit.
4) power module has lower electromagnetic radiation, does not influence the operate as normal of other part of system.
5) power module has microminiaturized characteristics, only in portable system, takies circuit board space seldom.
Traditional linear stabilized power supply is a kind of stabilized voltage power supply of transistor series adjustment, existing on the market at present a large amount of integrated linear stabilized power supply modules.This power technology comparative maturity has that good stability, output ripple are little, reliability is than characteristics such as height.But also have than significant disadvantages, as needing the bigger Industrial Frequency Transformer of volume, filter or radiator in the circuit usually, so the volume of circuit module is bigger; On the other hand, adjustment plumber in the linear voltage-stabilized power supply circuit does at linear magnifying state, need bear big voltage difference between its collector electrode and the emitter, and the power consumption that causes adjusting pipe is bigger, so the efficient of linear stabilized power supply is very low, generally only has an appointment 45%.
In sum, traditional linear stabilized power supply has tangible deficiency on efficient and volume, far can not adapt to the development of modern portable instrument, can not satisfy the requirement to volume, power consumption, the exigent Portable Data-Acquisition System of service efficiency.
Switching Power Supply is another kind of stabilized voltage power supply, and the power tube in it is not to be operated in linear zone, but is operated in saturated and cut-off region, promptly is operated on off state.With respect to linear power supply, its power consumption is lower, and efficient can reach 70%-95%.
But an apparent in view shortcoming of Switching Power Supply is that output quality is relatively poor, and promptly output ripple is bigger, and electromagnetic radiation is more serious, exists stronger spike harmonic to disturb, and can not satisfy the requirement of data acquisition system to the power supply output quality.
Summary of the invention
The present invention is directed to above problem, adopted Switching Power Supply+linear power supply the integrated drive generator structural design novel power module, can effectively reduce output ripple; Improve the power supply output quality; Taken into account the double factor of power supply output quality and efficient, this power module takes up space for a short time, low in energy consumption simultaneously, can carry out intelligent power managed through central control unit; Can satisfy the high requirement of Portable Data-Acquisition System fully, obtain good effect in the practical application power circuit.
Technical scheme of the present invention is following:
A kind of power module that is applicable to the high output quality of high efficiency of Portable Data-Acquisition System; Battery pack connects 3V low pressure differential voltage stabilizing circuit and DC-DC boost conversion circuit, and the DC-DC boost conversion circuit connects 5V low pressure differential voltage stabilizing circuit, and the output of 5V low pressure differential voltage stabilizing circuit connects artificial circuit part; Be the analog circuit power supply; 3V low pressure differential voltage stabilizing circuit connects the digital circuit part, is the digital circuit power supply, and central control unit (MCU) is controlled the Enable Pin of DC-DC boost conversion circuit through its control pin; Control the Kai Heguan of DC-DC boost conversion circuit with this, realize power supply management artificial circuit part; The Enable Pin of another control pin control 3V low pressure differential voltage stabilizing circuit of MCU is controlled it and is opened and close, and with this digital circuit part is carried out power supply management.
Described power module; Said DC-DC boost conversion circuit adopts the DC-DC boost conversion circuit based on TPS60110; Output at said TPS60110 connects one-level LC filter circuit again; The COM of said TPS60110 and SKIP pin be ground connection simultaneously, and push-pull mode and the constant mode of frequency of TPS60110 combined, and makes TPS60110 realize that the voltage stabilizing of first water exports.
Described power module, said 5V low pressure differential voltage stabilizing circuit is the low pressure differential voltage stabilizing circuit based on TPS76350, the 5V voltage of output analog circuit.
Described power module, said 3V low pressure differential voltage stabilizing circuit is the low pressure differential voltage stabilizing circuit based on TPS76330, the 3V voltage of output digital circuit.
The integrated drive generator structure of the Switching Power Supply+linear power supply that proposes among the present invention; Can effectively reduce output ripple; Effectively suppress Harmonic Interference and electromagnetic radiation, improve the output quality of power module, taken into account the double factor of power supply output quality and efficient; Can also make intrasystem central control unit carry out intelligent power managed easily, be to the more suitable circuit construction of electric power of Portable Data-Acquisition System.
Novel power supply module among the present invention can be supplied power for analog circuit and digital circuit simultaneously, and 5V and 3V stabilized voltage power supply are provided respectively, and low in energy consumption, volume is little, and the power supply output quality is high, and the power supply output ripple is in 2 millivolts.
Description of drawings
Fig. 1 is a power module theory diagram of the present invention;
Fig. 2 is LC filter circuit figure of the present invention;
Fig. 3 is the 5V output DC-DC boost conversion circuit based on TPS60110;
Fig. 4 is the circuit connection diagram of 3V low pressure differential voltage stabilizing circuit;
Fig. 5 is the circuit connection diagram of 5V low pressure differential voltage stabilizing circuit;
Embodiment
Below in conjunction with specific embodiment, the present invention is elaborated.
The structure of power module
Fig. 1 is the structure chart of power module in the Portable Data-Acquisition System.As shown in Figure 1; Battery pack connects 3V low pressure differential voltage stabilizing circuit and DC-DC boost conversion circuit, and the DC-DC boost conversion circuit connects 5V low pressure differential voltage stabilizing circuit, and the output of 5V low pressure differential voltage stabilizing circuit connects artificial circuit part; Be the analog circuit power supply; 3V low pressure differential voltage stabilizing circuit connects the digital circuit part, is the digital circuit power supply, and central control unit (MCU) is controlled the Enable Pin of DC-DC boost conversion circuit through its control pin; Control the Kai Heguan of DC-DC boost conversion circuit with this, realize power supply management artificial circuit part; The Enable Pin of another control pin control 3V low pressure differential voltage stabilizing circuit of MCU is controlled it and is opened and close, and with this digital circuit part is carried out power supply management.
This power supply architecture of this module; Help carrying out the precision management of power consumption; Can carry out the timesharing division operation to the various piece of analog-and digital-circuit according to the workflow of system; Carry out meticulous power supply management by MCU, the power supply of the subregion that synchronization is not used thoroughly turn-offs, and this can significantly reduce system power dissipation.
In this power module, the rear pump of battery pack is raised to the output of 5V voltage through the DC-DC boost conversion circuit.In order to make output voltage stability high, ripple is as far as possible little, connects one-level again at the output of DC-DC boost conversion circuit and has the low pressure differential voltage stabilizing circuit that strong ripple suppresses ability.The integrated drive generator structure of this Switching Power Supply+linear power supply can effectively reduce output ripple, improves the power supply output quality, has taken into account the double factor of power supply output quality and efficient, is to the more suitable circuit construction of electric power of Portable Data-Acquisition System.
The DC-DC boost conversion circuit
DC-DC translation circuit with boosting is a kind of of switching circuit, and the quality of its out-put supply and actual converted efficient are the factors that needs emphasis to consider.
DC-DC boost conversion circuit commonly used can be divided into two big types: switch type regulator booster and capacitive charge pump.Which kind of DC-DC translation circuit no matter, its operation principle is: through energy-storage travelling wave tube (inductance or electric capacity) stored electric energy, released energy the output voltage of acquisitions needs then with controlled way by circuit.Different is, the switch type regulator booster mainly adopts big inductance to come storing energy, and capacitive charge pump then adopts electric capacity.Though the boost conversion circuit of two kinds of forms can provide higher power supply conversion efficiency, in actual the use very big difference is arranged, select suitable DC-DC boost conversion circuit most important to the design of power module.
The switch type regulator booster is a kind of boost conversion circuit based on inductance, and its conversion efficiency is higher, can reach more than 85% usually.Owing to adopted the energy-storage travelling wave tube of power switch pipe (being generally metal-oxide-semiconductor or FET) and large-size---big inductance (more than the tens μ H) and big electric capacity (being generally hundreds of μ F); Its starting resistor is lower; The scope of boosting is bigger, and output current is big (can reach more than the 1A) usually also.But this boost conversion circuit output ripple is bigger; Spike can reach millivolts up to a hundred; And because the frequent switch motion of power switch pipe; Making has stronger Harmonic Interference in the output, and conventional noise reduction means such as good wiring, ground connection are handled and added decoupling capacitor etc., all improve not remarkable to its noise.So though higher based on the boost conversion circuit efficient of inductance, output quality is relatively poor, electromagnetic radiation is more serious, and output ripple is bigger, exists stronger spike harmonic to disturb, and can not satisfy the requirement of data acquisition system to the power supply output quality.And its peripheral circuit is complicated, and required components and parts are more, and a plurality of big inductance, big electric capacity and power switch pipe also constitute bigger burden to the limited circuit board space of portable system.
Capacitive charge pump is the DC-DC boost conversion circuit of another kind of form.It uses electric capacity to replace inductance or transformer to come storage of electrical energy.It utilizes high-frequency generator, and the charge and discharge of control capacitance are passed to load with energy by input.Can produce plus or minus voltage from input voltage, its input voltage multiply by the output voltage that the factors such as 0.5,2 or 3 produce to be needed.The integrated charge pump is because the restriction of its integrated electric capacity volume, less current output (usually at 10mA～150mA, < 300mA) often can only be provided, but for most Portable Data-Acquisition System, its electric current output is enough.
Capacitive charge pump is owing to adopt little electric capacity to come storing energy, and energy-storage travelling wave tube such as inductance greatly is not so generally exist tangible electromagnetic noise.Its volume is little, and circuit structure is simple, and general of peripheral circuit needs several little electric capacity, and cost is also lower.This shows that capacitive charge pump can be taken into account efficient under the prerequisite of preferential assurance out-put supply quality, be suitable as the DC-DC boost conversion circuit of Portable Data-Acquisition System.
DC-DC boost conversion circuit based on TPS60110
DC-DC boost conversion circuit based on TPS60110 is specifically as shown in Figure 3.TPS60110 is a kind of novel low-noise Acoustic Charge pump chip of TI company, has following characteristics:
The voltage stabilizing output of 5V is provided, is lower than the output voltage ripple of 10mV, it exports no obvious electromagnetic radiation; Efficient can reach 90%, and maximum output current 300mA can satisfy the native system needs; The quiescent current of 60 μ A, the shutoff leakage current of 0.05 μ A, power consumption is extremely low; Input voltage range with 2.7-5.4V, the stability that the assurance system exports in the battery electric quantity change procedure; The encapsulation of TSSOP paster, peripheral circuit only need several little electric capacity, and the circuit volume is very little; The shutoff of the ENABLE Enable Pin control TPS60110 of TPS60110 chip, when ENABLE=0, TPS60110 gets into off state, only consumes 0.05 μ A electric current this moment, and input and output isolation fully, for system provides the intelligent electric power management function.
The external level of the COM pin through changing TPS60110 can be selected the operating state of charge pump in it, makes it work in push-pull mode (COM=0) or single-ended mode (COM=1).The SKIP pin can be controlled the variation of switching frequency, makes it work in pulse-skip mode (SKIP=1) or frequency constant (SKIP=0) mode.So just can pass through the mode of operation of COM, SKIP pin Combination Control TPS60110 chip.
In order to guarantee the out-put supply quality, make COM and SKIP pin ground connection simultaneously in this power module, the push-pull mode and the constant mode of frequency that are about to TPS60110 combine, and can make TPS60110 realize the voltage stabilizing output of first water.
Reduce input capacitance C
1nEquivalent series resistance (ESR) can improve system effectiveness and stable input current.Input capacitance C
1nThe appearance value be set at pump electric capacity 2-4 doubly.Simultaneously, output capacitance C
OutShould have lower ESR,, can reduce ripple simultaneously to reduce the unnecessary consumption of electric energy.Two pump capacitor C 1 are then selected high frequency performance ceramic condenser preferably with C2.
When push pull mode was worked, spike can appear at the moment of phase overturn in the circuit.Though the spike of TPS60110 disturbs the switching circuit with respect to other form that bigger improvement has been arranged; But the existence of spike still can cause certain interference to the signal sampling process of data acquisition system, therefore need further improve the output quality of TPS60110.Main method is that the output at TPS60110 connects one-level LC filter circuit again.The frequency of TPS60110 output ripple is near 100MHz.Because this is a high-frequency interferencing signal, therefore can adopt the Passive LC low-pass filter circuit, required like this electric capacity and inductance value are less, and its size is also less, can save circuit board space and circuit cost.Circuit structure is as shown in Figure 2.The direct voltage of 2 pin output can be influenced by the D.C. resistance of inductance L and a little less than 5V among Fig. 2, and also can receive the influence of load, and the feedback pin FB that therefore receives TPS60110 to the output of 2 pin goes up with stable and exports.
The wiring of boost conversion circuit is extremely important to suppressing electromagnetic interference.Following rule: C4 in circuit board wiring, followed by need and C5 is two decoupling capacitors, should be as far as possible near the TPS60110 chip during wiring; All earth terminals of TPS60110 should be received same ground; The placement of input and output electric capacity should be as far as possible near the respective pins of TPS60110, to reduce the resistance value of bringing because of lead; Two pump capacitor C 1 will equate that to the placement distance of TPS60110 promptly placement location is about the TPS60110 symmetry with C2; The fin of chip bottom should be welded on the power supply ground of printed circuit board (PCB); All leads in the power circuit are short as much as possible and thick.
Employing is based on the charge pump type DC-DC boost conversion circuit of TPS60110, for high conversion efficiency, output ripple and low, the low electromagnetic of power module provides the important techniques assurance.
The low pressure differential voltage stabilizing circuit
As shown in Figure 1; In order further to improve the output quality of power circuit, especially further reduce ripple, in this power module; Output at the DC-DC boost conversion circuit has connect the low pressure differential voltage stabilizing circuit of one-level based on TPS76350 again, the 5V voltage of output analog circuit.
Also connect the low pressure differential voltage stabilizing circuit of one-level after the battery pack, with the 3V voltage of output digital circuit based on TPS76330.
TPS76350 and TPS76330 are the low pressure differential voltage stabilizing circuits of TI company.All exportable 150mA electric current, quiescent current is lower than 2 μ A during shutoff, owing to adopted voltage-controlled PMOS transmission apparatus, voltage stabilizing circuit self does not need bigger drive current when output current increases, and has improved efficient.
The SOT-23 encapsulation that TPS76350 and TPS76330 low pressure differential voltage stabilizing circuit adopt has only 5 pins, and peripheral needs two little electric capacity, and like C6 in the TPS76330 voltage stabilizing circuit and C7, C8 in the TPS76350 voltage stabilizing circuit and C9 can effectively save the space.Physical circuit such as Fig. 4 and shown in Figure 5.All electric capacity all adopt the tantalum electric capacity of Surface Mount encapsulation in Fig. 4 and Fig. 5 circuit.Tantalum electric capacity has lower equivalent series resistance and temperature characterisitic preferably, can effectively reduce output ripple and improve circuit efficiency.
The ripple rejection ratio of TPS76350 and TPS76330 low pressure differential voltage stabilizing circuit has reached 60db, and after the further voltage stabilizing of TPS76350, output ripple can be limited in 2 millivolts based on the 5V output voltage of the DC-DC boost conversion circuit of TPS60110.
The integrated drive generator structure of the Switching Power Supply+linear power supply that proposes among the present invention; Can effectively reduce output ripple; Effectively suppress Harmonic Interference and electromagnetic radiation, improve the output quality of power module, taken into account the double factor of power supply output quality and efficient; Can also make intrasystem central control unit carry out intelligent power managed easily, be to the more suitable circuit construction of electric power of Portable Data-Acquisition System.
Novel power supply module among the present invention can be supplied power for analog circuit and digital circuit simultaneously, and 5V and 3V stabilized voltage power supply are provided respectively, and low in energy consumption, volume is little, and the power supply output quality is high, and the power supply output ripple is in 2 millivolts.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (4)
1. a power module that is applicable to the high output quality of high efficiency of Portable Data-Acquisition System is characterized in that, battery pack connects 3V low pressure differential voltage stabilizing circuit and DC-DC boost conversion circuit; The DC-DC boost conversion circuit connects 5V low pressure differential voltage stabilizing circuit; The output of 5V low pressure differential voltage stabilizing circuit connects artificial circuit part, is the analog circuit power supply, and 3V low pressure differential voltage stabilizing circuit connects the digital circuit part; Be the digital circuit power supply; Central control unit (MCU) is controlled the Enable Pin that pin is controlled the DC-DC boost conversion circuit through it, controls the Kai Heguan of DC-DC boost conversion circuit with this, realizes the power supply management to artificial circuit part; The Enable Pin of another control pin control 3V low pressure differential voltage stabilizing circuit of MCU is controlled it and is opened and close, and with this digital circuit part is carried out power supply management.
2. power module according to claim 1; It is characterized in that; Said DC-DC boost conversion circuit adopts the DC-DC boost conversion circuit based on TPS60110, connects one-level LC filter circuit again, the COM of said TPS60110 and SKIP pin while ground connection at the output of said TPS60110; Push-pull mode and the constant mode of frequency of TPS60110 are combined, make TPS60110 realize the voltage stabilizing output of first water.
3. power module according to claim 1 is characterized in that, said 5V low pressure differential voltage stabilizing circuit is the low pressure differential voltage stabilizing circuit based on TPS76350, the 5V voltage of output analog circuit.
4. power module according to claim 1 is characterized in that, said 3V low pressure differential voltage stabilizing circuit is the low pressure differential voltage stabilizing circuit based on TPS76330, the 3V voltage of output digital circuit.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104734500A (en) * | 2015-04-12 | 2015-06-24 | 南京巨鲨显示科技有限公司 | Power supply tree implementing method for typical topology structure |
| CN105006962A (en) * | 2015-08-19 | 2015-10-28 | 杭州准联科技有限公司 | Device for directly taking power from electrolytic tank and method thereof |
| CN105435348A (en) * | 2014-08-08 | 2016-03-30 | 北京谊安医疗系统股份有限公司 | Power system for accurately supplying power to anaesthesia machine |
| CN107482707A (en) * | 2017-07-27 | 2017-12-15 | 太仓华淏信息科技有限公司 | A kind of Portable micro-consumption data collecting system power module |
| CN108242928A (en) * | 2016-12-27 | 2018-07-03 | 北京普源精电科技有限公司 | The power supply circuit and spectrum analyzer of a kind of ADC |
| CN116054307A (en) * | 2022-07-27 | 2023-05-02 | 荣耀终端有限公司 | Power supply control system and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105435348A (en) * | 2014-08-08 | 2016-03-30 | 北京谊安医疗系统股份有限公司 | Power system for accurately supplying power to anaesthesia machine |
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| CN108242928B (en) * | 2016-12-27 | 2023-06-16 | 北京普源精电科技有限公司 | Power supply circuit of ADC and spectrum analyzer |
| CN107482707A (en) * | 2017-07-27 | 2017-12-15 | 太仓华淏信息科技有限公司 | A kind of Portable micro-consumption data collecting system power module |
| CN116054307A (en) * | 2022-07-27 | 2023-05-02 | 荣耀终端有限公司 | Power supply control system and electronic equipment |
| CN116054307B (en) * | 2022-07-27 | 2023-10-20 | 荣耀终端有限公司 | Power supply control system and electronic equipment |
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Application publication date: 20121031 |