CN106972745A - Power supply sharing control system - Google Patents
Power supply sharing control system Download PDFInfo
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- CN106972745A CN106972745A CN201710347827.3A CN201710347827A CN106972745A CN 106972745 A CN106972745 A CN 106972745A CN 201710347827 A CN201710347827 A CN 201710347827A CN 106972745 A CN106972745 A CN 106972745A
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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
- H02M3/00—Conversion of dc power input into dc power output
Abstract
The invention discloses power supply sharing control system, including main power source management sampling module, from power management sampling module and from electric power outputting current modulation module, main power source management sampling module and from power management sampling module including electric power management circuit, current sampling resistor and low bias voltage operational amplifier；Electric power management circuit is used for conversion electric power voltage；Current sampling resistor is serially connected with the outlet line of electric power management circuit；Low bias voltage operational amplifier is used to obtain voltage signal and the amplification on current sampling resistor, is then transmit to from electric power outputting current modulation module；It is used for the error signal for amplifying master-slave circuit from electric power outputting current modulation module, and feeds back to from power management sampling module；It is additionally operable to adjust output current according to feedback signal from power management sampling module.The power module uniform load sharing electric current in parallel power supply system is can guarantee that during present invention application, and then the stability and reliability of parallel power supply system can be lifted.
Description
Technical field
The present invention relates to power management techniques, specifically power supply sharing control system.
Background technology
In the case where needing Large Copacity to power, if powered using single power supply, huge power certainly will be handled, this
Selection of the meeting to power device, and the raising of switching frequency and power density bring difficulty, and cost is also sufficiently expensive.And one
Denier power failure, then cause whole system to be collapsed.And use distribution power power supply mode, using in multiple, it is low power
Power sources in parallel is come new focus that the high power system of setting up building block system is developed recently.By the quantity for changing parallel module
To meet the load of different capacity, flexible design, each module bears less electric stress, and switching frequency can reach megahertz
Level, so as to improve the density of system.
Sum it up, the development of high power load demand and distributed power supply system so that switch power parallel controls skill
The importance of art research increasingly increases.For being powered than traditional single supply, parallel power supply system has lot of advantages, example
Such as：High current can be achieved, high efficiency can be configured as needed to redundant system, can realize the expandability of power supply, can
Reduce cost input etc..
However, in parallel system, limitation and the inevitable property of error due to technological level, actual in parallel each
Their parameter of module more or less all can be variant, and this species diversity may only reduce as far as possible, but be difficult to avoid completely.In addition,
The parameter of modules can also change with the change of the extraneous factor such as temperature over time, and this be produced by environmental factors
The difference of each module parameter may be also big more than the difference of module inherently.In view of participating in each of parallel connection in system
The characteristic of individual module can not be completely the same, certainly will be it is difficult to ensure that each power module is equal if in parallel directly by power module
Even load sharing electric current, has a strong impact on the stability and reliability of system.How power module in parallel power supply system is ensured
Uniform load sharing electric current, with improving stability and reliability, this turns into current people's question of common concern, however, now
There is no corresponding equipment, have no relevant report yet.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of power supply sharing control system, it is applied
When can guarantee that the uniform load sharing electric current of power module in parallel power supply system, and then the stabilization of parallel power supply system can be lifted
Property and reliability.
The present invention, which solves the above problems, to be achieved through the following technical solutions：Power supply sharing control system, including main electricity
Source control sampling module, from power management sampling module and from electric power outputting current modulation module, the main power source management sampling
Module and from power management sampling module include electric power management circuit, current sampling resistor and low bias voltage operation amplifier
Device；
The electric power management circuit is used to input supply voltage being converted into setting magnitude of voltage output；
The current sampling resistor is serially connected with the outlet line of electric power management circuit；
The in-phase input end and inverting input of the low bias voltage operational amplifier are connected to current sampling electricity
Two ends are hindered, for obtaining the voltage signal on current sampling resistor and amplifying the voltage signal of acquisition, are then transmit to from electricity
Source output current modulation module；
It is described to be used to receive main power source management sampling module from electric power outputting current modulation module and sampled from power management
The voltage signal that both modules are amplified through low bias voltage operational amplifier, amplifies the error signal of master-slave circuit, and will amplification
Error signal afterwards feeds back to the electric power management circuit from power management sampling module；
The electric power management circuit from power management sampling module is additionally operable to defeated from electric power outputting current modulation module
Control is reduced from circuit output current when going out voltage rise, and when being reduced from electric power outputting current modulation module output voltage
Control is raised from circuit output current.Electric power management circuit in main power source of the present invention management sampling module, current sampling resistor and
The circuit that low bias voltage operational amplifier is constituted is main circuit, electric power management circuit, electric current from power management sampling module
The circuit that sample resistance and low bias voltage operational amplifier are constituted is from circuit.
Further, the electric power management circuit includes power management chip, boost capacitor, energy storage inductor, electric resistance partial pressure
Device and noise control resistance, the power management chip use TPS5450 chips, the 7th pin external power supply of power management chip,
Its 6th pin and the 9th pin are grounded；The boost capacitor two ends respectively with the first pin of power management chip and the 8th
Pin is connected, and the outlet line of electric power management circuit is connected on the 8th pin of power management chip, and energy storage inductor is serially connected with
Between power management chip and current sampling resistor；The resitstance voltage divider includes two resistance of concatenation, resitstance voltage divider one
End is connected on the outlet line of electric power management circuit, its other end ground connection；Described noise control resistance one end is connected to electric resistance partial pressure
On circuit between two resistance of device, the 4th pin connection of its other end and power management chip；It is described to export electricity from power supply
The output end of stream modulation module is connected on the circuit between two resistance of resitstance voltage divider.
The power management chip of the present invention uses TPS5450 chips, and it is the DC/DC chips of TI companies.Using power half
Conductor device is as switch element, by periodicity on-off switch, and the dutycycle of controlling switch element adjusts output voltage, will
A kind of DC voltage conversion is another DC voltage, referred to as switching mode DC/DC converters.The work of switching mode DC/DC converters
It is as principle：A cycle TsIt is interior, electronic switch turn-on time tonShared whole cycle TsRatio, referred to as duty cycle D,
D=ton/Ts, turn-off time toffShared TsRatio, referred to as disconnects dutycycle D ', D '=toff/Ts.Duty cycle is bigger, load
On voltage it is higher.1/Ts=fsReferred to as switching frequency, fsHigher, the voltage in load is also higher.Opening in DC/DC converters
Close in a certain operation at frequencies, maintained switch frequency-invariant and the length (i.e. the width of pulse) for changing turn-on time, make load
During change, the little method of voltage change in load, referred to as pulse-width modulation method (Pulse Width Modulation).
Pulse width modulation controls the switch converters of electronic switch, referred to as PWM switch converters.Keep pulse width constant,
The method for changing dutycycle by changing switch operating frequency and adjusting the voltage in load, referred to as pulse frequency modulated method
(Pulse Frequency Modulation), pulse frequency modulated mode controls the switch converters of electronic switch, referred to as PFM
Switch converters.The present invention devises two-way Buck type current-sharing power supplies using DC/DC chips, wherein, Buck converters are a kind of
Output voltage average value VOLess than or equal to input voltage VISingle switch pipe non-isolation type direct-current converter, the converter is main
It is made up of full-controlled switch pipe, inductance element, capacitor and fly-wheel diode, inductance element constitutes LC filtered electricals with capacitor
Road, inductance element is energy storage filter inductance, and its effect is the t during controlling switch is connectedonLimitation high current passes through, and prevents defeated
Enter voltage to be applied directly in load carry out voltge surge to load.The effect of fly-wheel diode is during controlling switch is turned off
toff, released energy offer current path to energy storage filter inductance.When switching tube is turned on, input voltage is applied on inductance, electricity
It can be stored in inductance and electric capacity, while being also fed back to load.When switching tube ends, the energy in inductance, electric capacity is stored in
Release, continues to power to the load, and diode constitutes current loop.When switching tube is turned on, supply voltage be equal to inductive drop with
Output voltage sum, inductive current is in time tonInterior linear rise；When switching tube ends, inductive drop is equal to negative output electricity
Pressure, inductive current is in time toffInterior linear decline.In a cycle TsInterior, inductive current is serrated, when the valley point of sawtooth is firm
It is good when intersect with transverse axis time-base, be electric current continuously with discontinuous critical point, the average value of inductive current is exactly to export electric
The average value of stream.The dutycycle for changing drive signal is the ON time for changing switching tube, you can obtain the output voltage of circuit.
Further, on the circuit between the 7th pin and its external power supply of the power management chip, Yi Ji electricity
Filter circuit is equipped with the outlet line of power management circuits.
Further, the low bias voltage operational amplifier uses OPA197 chips, its inverting input and output end
Between be provided with feedback resistance, and the circuit that is connected with current sampling resistor of its in-phase input end and be serially connected with a resistance.This hair
It is bright by setting feedback resistance, influence of the noise to feedback signal can be reduced.
Further, it is described to include operational amplifier from electric power outputting current modulation module, its in-phase input end with from electricity
The low bias voltage operational amplifier output terminal connection of source control sampling module, anti-in-phase input end manages sampling mold with main power source
The low bias voltage operational amplifier output terminal connection of block, output end connects with the electric power management circuit from power management sampling module
Connect.
Further, it is described also to include adjustable resistance from electric power outputting current modulation module, from electric power outputting current modulation
The operational amplifier of module use OP37 chips, the fixing end of adjustable resistance two respectively with the first pin of operational amplifier and the 8th
Pin is connected, and the 5th pin of its is adjustable end and operational amplifier is connected.The present invention is exported by adjustable resistance, balance from power supply
Because fine difference caused by input offset voltage between two inputs of operational amplifier of current-modulation module.
In summary, the invention has the advantages that：Overall structure of the present invention is simple, few using component, is easy to
Realize, cost is low, the present invention is using two-way power supply and is equipped with electric power management circuit, can reduce uncertain factor, it is ensured that steady
Qualitative and reliability；Again because of the method that the present invention is flowed using principal and subordinate, precision is high, can further lift the reliability of the present invention.
In this way, can guarantee that the power module uniform load sharing electric current in parallel power supply system during present invention application, and then it can be lifted simultaneously
Join the stability and reliability of power-supply system.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of a specific embodiment of the invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment：
As shown in figure 1, power supply sharing control system, including main power source management sampling module, from power management sampling module
And from electric power outputting current modulation module, wherein, main power source manages sampling module and includes electricity from power management sampling module
Power management circuits, current sampling resistor and low bias voltage operational amplifier.Electric power management circuit is used for input supply voltage
It is converted into setting magnitude of voltage output；Current sampling resistor is serially connected with the outlet line of electric power management circuit；Low bias voltage is transported
The in-phase input end and inverting input for calculating amplifier are connected to current sampling resistor two ends, for obtaining current sampling electricity
Voltage signal in resistance simultaneously amplifies the voltage signal of acquisition, is then transmit to from electric power outputting current modulation module；From power supply
Output current modulation module is used to receive main power source management sampling module and from both power management sampling modules through low biased electrical
The voltage signal of operational amplifier amplification is pressed, amplifies the error signal of master-slave circuit, and the error signal after amplification is fed back to
From the electric power management circuit of power management sampling module；It is additionally operable to from the electric power management circuit of power management sampling module from electricity
Control is adjusted from circuit output current reduction, and from electric power outputting current during the output current modulation module output voltage rise of source
Molding block output voltage reduces time control system and raised from circuit output current.Main power source manages the electric current of sampling module in the present embodiment
Sample resistance is resistance R9, and the low bias voltage operational amplifier of main power source management sampling module is operational amplifier U6；From electricity
The current sampling resistor of source control sampling module is resistance R10, from the low bias voltage operation amplifier of power management sampling module
Device is operational amplifier U7.
The electric power management circuit of the present embodiment include power management chip, boost capacitor, energy storage inductor, resitstance voltage divider,
Fly-wheel diode and noise control resistance, wherein, power management chip uses the BUCK type DC/DC chip TPS5450 of TI companies,
Its maximum output current 5A, is internally integrated drive circuit and 1.221V a reference sources, fixed working frequency 500KHz.It is big in order to prevent
The output pin that electric current crosses senior general TPS5450 is burnt out, and the output pin of power management chip uses thicker copper conductor in the present embodiment
Individually draw, while in order that chip heating well, the pad of power management chip belly and power supply is picked up and come.Power supply pipe
The 7th pin external power supply of chip is managed, its 6th pin and the 9th pin are grounded.Boost capacitor two ends respectively with power supply pipe
The first pin and the connection of the 8th pin of chip are managed, the outlet line of electric power management circuit is connected to the 8th of power management chip the
On pin, energy storage inductor is serially connected between power management chip and current sampling resistor.Resitstance voltage divider includes two of concatenation
Resistance, resitstance voltage divider one end is connected on the outlet line of electric power management circuit, its other end ground connection.Resitstance voltage divider and electricity
The node of the outlet line of power management circuits is located at the line of the other end connection at the relative connection energy storage inductor end of current sampling resistor
Lu Shang.The 8th pin connection of fly-wheel diode plus earth, its negative pole and power management chip.Noise control resistance one end is connected to
On circuit between two resistance of resitstance voltage divider, the 4th pin connection of its other end and power management chip.It is defeated from power supply
The output end for going out current-modulation module is connected on the circuit between two resistance of resitstance voltage divider.
The corresponding relation of each component in fig. 1 is in the present embodiment main power source management sampling module：Power management core
Piece is power management chip U1, and boost capacitor is electric capacity C1, and energy storage inductor is inductance L1, and two resistance of resitstance voltage divider are distinguished
For resistance R1 and resistance R3, fly-wheel diode is diode D1, and noise control resistance is resistance R12.The present embodiment takes from power management
The corresponding relation of each component in fig. 1 is in egf block：Power management chip is power management chip U2, and boost capacitor is
Electric capacity C2, energy storage inductor is inductance L2, and two resistance of resitstance voltage divider are respectively resistance R2 and resistance R4, and fly-wheel diode is
Diode D2, noise control resistance is resistance R13.
On circuit between the 7th pin and its external power supply of the power management chip of the present embodiment and power supply pipe
Filter circuit is equipped with the outlet line for managing circuit.Wherein, in main power source management sampling module power management chip U1 the
The filter circuit on circuit between seven pins and its external power supply by electrochemical capacitor EC3, electrochemical capacitor EC4 and electric capacity C5 simultaneously
Connection is constituted, and the parallel circuit one end is connected on the circuit between power management chip U1 the 7th pin and power supply, and its is another
End ground connection.Filter circuit in main power source management sampling module on the outlet line of electric power management circuit by electrochemical capacitor EC1 and
Electric capacity C3 parallel connections are constituted, and the parallel circuit one end is connected to connection of the resitstance voltage divider on the outlet line of electric power management circuit
On circuit between node and resistance R9.Power management chip U2 the 7th pin is external with it from power management sampling module
Power supply between circuit on filter circuit be made up of electrochemical capacitor EC5, electrochemical capacitor EC6 and electric capacity C6 parallel connections, the parallel connection
Circuit on one side is connected on the circuit between power management chip U2 the 7th pin and power supply, its other end ground connection.From power supply
The filter circuit in sampling module on the outlet line of electric power management circuit is managed by electrochemical capacitor EC2 and electric capacity C4 structures in parallel
Into the parallel circuit one end is connected to connecting node and resistance of the resitstance voltage divider on the outlet line of electric power management circuit
On circuit between R10.
The low bias voltage operational amplifier of the present embodiment uses OPA197 chips, and low bias voltage operational amplifier is used
28V power supplys are powered, and feedback resistance, and its in-phase input end and current sampling resistor are provided between its inverting input and output end
A resistance is serially connected with the circuit of connection.Feedback resistance between operational amplifier U6 inverting inputs and output end is resistance
The resistance concatenated on R15, the circuit that its in-phase input end is connected with current sampling resistor R9 is resistance R16, operational amplifier U6
Inverting input is connected with pull down resistor R14.Feedback resistance between operational amplifier U7 inverting inputs and output end is electricity
It is resistance R18, operational amplifier to hinder the resistance concatenated on R17, the circuit that its in-phase input end is connected with current sampling resistor R10
U7 inverting inputs are connected with pull down resistor R19.
The present embodiment from electric power outputting current modulation module includes operational amplifier U5 and adjustable resistance RS1, and computing puts
Big device U5 uses OP37 chips, and operational amplifier U5 powers using 5V power supplys, its in-phase input end and from power management sampling mold
The low bias voltage operational amplifier U7 output ends connection of block, anti-in-phase input end manages the low biasing of sampling module with main power source
Voltage operational amplifier U6 output ends are connected, with the power management from power management sampling module after output end series resistor R25
Circuit is connected.The fixing ends of adjustable resistance RS1 two are connected with operational amplifier U5 the first pin and the 8th pin respectively, and its is adjustable
End is connected with operational amplifier U5 the 5th pin.
The external 28V power supplys of power management chip U1 and U2, power management chip U1 and U2 output voltage in the present embodiment
For 12V, and it is adjustable in 11.5V~12.5V, and current sampling resistor R9, R10 use resistance for the Low Drift Temperature metal film in 0.05 Europe
Resistance.When the present embodiment is applied, the positive-negative input end that two-way sampled signal is respectively fed to operational amplifier U5 is carried out further
Error is amplified.Operational amplifier U5 output end feeds back to the pressure feedback port from circuit, due to operational amplifier U5 low mistake
Voltage is adjusted, so in theory can be by the current control of two-way within 5mA.When in parallel, if certain moment is from circuital current
Increase, operational amplifier U5 positive voltage terminal and the voltage difference of negative terminal increase, operational amplifier U5 output end voltage rise, this
Signal can play modulation from circuit dutycycle, reduce it and reduced with reaching from circuit output current.Conversely, when electric from circuit
When stream reduces, operational amplifier U5 output voltages reduce, and modulation increases from electric current.The present embodiment is in welding circuit, feedback letter
One point earth is wanted in ground corresponding to number with high current, and otherwise power supply load regulation rate will be undesirable；And in order to reduce interference pair
The influence of feedback signal, feedback line shielding line.All it is equivalent resistance to improve the electric capacity used in system effectiveness, circuit
It is small, in TPS5450 (switching frequency 500KHz) if near electric capacity high frequency characteristics it is good.In order to reduce the power consumption of wire,
The scolding tin comparison that to walk is thick during welding circuit.It is more with stored energy ratio during around energy storage inductor, the magnetic core of air gap is not driven.
Power work is in electric current continuation mode during energy storage inductor design requirement underloading.If breaking because being operated in electric current during underloading
Continuous mode, then output voltage can raise, the load regulation of power supply can be influenceed.
(1) Imin is set as critical current, and Iv is the valley point current of inductance, electric current is all not zero in whole cycle, then
Iv ＞ 0 are needed, so：
Then
(2) because of Imin=0.1A, (Vo) max=12.5V, f=500KHz, Toff=(1-Vo/Vin)/f；Calculate L ＞
L=100uH is taken in 37uH, the present embodiment.
When the present embodiment is applied, power supply ripple test result is as shown in table 1：
The power supply ripple of table 1 tests table
| Test point | 214mA | 678mA | 1034mA | 1621mA | 2011mA |
| Feng Lu | 2mV | 2mV | 3mV | 4mV | 4mV |
| From road | 3mV | 3mV | 3mV | 4mV | 4mV |
| Parallel current-sharing | 3mV | 3mV | 4mV | 4mV | 5mV |
Stream test bias result is as shown in table 2：
Table 2 flows test bias table
| Test point (A) | Main road electric current I1 (mA) | From road electric current I2 (mA) | Flow deviation delta |
| 0.1 | 101 | 101 | 0% |
| 0.2 | 213 | 214 | 0.46% |
| 0.3 | 317 | 318 | 0.26% |
| 0.4 | 406 | 408 | 0.49% |
| 0.5 | 523 | 525 | 0.38% |
| 0.6 | 610 | 613 | 0.48% |
| 0.7 | 718 | 719 | 0.14% |
| 0.8 | 804 | 806 | 0.25% |
| 0.9 | 901 | 902 | 0.11% |
| 1.0 | 1007 | 1007 | 0% |
| 1.1 | 1102 | 1103 | 0.091% |
| 1.2 | 1199 | 1200 | 0.083% |
| 1.3 | 1311 | 1312 | 0.076% |
| 1.4 | 1419 | 1419 | 0% |
As shown in Table 2, when the present embodiment is applied, equal stream error is within 1%.If being not added with sharing control, due to two-way
Device and printed board resistance difference may cause only all the way to have that electric current is exported or the current difference of two-way output is very big,
Power supply overwork all the way can so be caused.
Power-efficient test result is as shown in table 3：
The power-efficient of table 3 tests table
As shown in Table 3, power supply gross efficiency is up to more than 91% when the present embodiment is applied.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (6)
1. power supply sharing control system, it is characterised in that including main power source management sampling module, from power management sampling module and
From electric power outputting current modulation module, the main power source management sampling module and from power management sampling module including power supply pipe
Manage circuit, current sampling resistor and low bias voltage operational amplifier；
The electric power management circuit is used to input supply voltage being converted into setting magnitude of voltage output；
The current sampling resistor is serially connected with the outlet line of electric power management circuit；
The in-phase input end and inverting input of the low bias voltage operational amplifier are connected to current sampling resistor two
End, for obtaining the voltage signal on current sampling resistor and amplifying the voltage signal of acquisition, is then transmit to defeated from power supply
Go out current-modulation module；
It is described to be used to receive main power source management sampling module and from power management sampling module from electric power outputting current modulation module
The voltage signal that both amplify through low bias voltage operational amplifier, amplifies the error signal of master-slave circuit, and by after amplification
Error signal feeds back to the electric power management circuit from power management sampling module；
The electric power management circuit from power management sampling module is additionally operable to exporting electricity from electric power outputting current modulation module
Control is from circuit output current reduction during pressure rise, and is reducing time control system from electric power outputting current modulation module output voltage
From circuit output current rise.
2. power supply sharing control system according to claim 1, it is characterised in that the electric power management circuit includes power supply
Managing chip, boost capacitor, energy storage inductor, resitstance voltage divider and noise control resistance, the power management chip use TPS5450 cores
Piece, the 7th pin external power supply of power management chip, its 6th pin and the 9th pin are grounded；The boost capacitor two ends
It is connected respectively with the first pin and the 8th pin of power management chip, the outlet line of electric power management circuit is connected to power supply pipe
On the 8th pin for managing chip, energy storage inductor is serially connected between power management chip and current sampling resistor；The electric resistance partial pressure
Device includes two resistance of concatenation, and resitstance voltage divider one end is connected on the outlet line of electric power management circuit, its another termination
Ground；Described noise control resistance one end is connected on the circuit between two resistance of resitstance voltage divider, its other end and power management core
The 4th pin connection of piece；The output end from electric power outputting current modulation module be connected to two resistance of resitstance voltage divider it
Between circuit on.
3. power supply sharing control system according to claim 2, it is characterised in that the 7th of the power management chip draws
Filter circuit is equipped with circuit between pin and its external power supply and on the outlet line of electric power management circuit.
4. power supply sharing control system according to claim 1, it is characterised in that the low bias voltage operational amplifier
Using OPA197 chips, feedback resistance, and its in-phase input end and current sampling are provided between its inverting input and output end
A resistance is serially connected with the circuit of resistance connection.
5. the power supply sharing control system according to any one in Claims 1 to 4, it is characterised in that described from power supply
Output current modulation module includes operational amplifier, and its in-phase input end is transported with the low bias voltage from power management sampling module
Amplifier out connection is calculated, the low bias voltage operational amplifier that anti-in-phase input end manages sampling module with main power source is exported
End connection, output end is connected with from the electric power management circuit of power management sampling module.
6. power supply sharing control system according to claim 5, it is characterised in that described to modulate mould from electric power outputting current
Block also includes adjustable resistance, and OP37 chips are used from the operational amplifier of electric power outputting current modulation module, and adjustable resistance two is consolidated
Fixed end is connected with the first pin and the 8th pin of operational amplifier respectively, and the 5th pin of its is adjustable end and operational amplifier connects
Connect.
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| CN201710347827.3A CN106972745A (en) | 2017-05-17 | 2017-05-17 | Power supply sharing control system |
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| CN201710347827.3A CN106972745A (en) | 2017-05-17 | 2017-05-17 | Power supply sharing control system |
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| CN109039045A (en) * | 2018-09-03 | 2018-12-18 | 山东超越数控电子股份有限公司 | LDO parallel current-equalizing circuit |
| CN112202159A (en) * | 2020-09-28 | 2021-01-08 | 努比亚技术有限公司 | Balanced current circuit, charger and mobile terminal |
| CN114268215A (en) * | 2021-12-16 | 2022-04-01 | 中国电子科技集团公司第五十八研究所 | DCR current sampling-based parallel current-sharing power supply system |
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Application publication date: 20170721 |