CN106484019A - A kind of linear voltage regulator, electric power system and pressure regulation method - Google Patents
A kind of linear voltage regulator, electric power system and pressure regulation method Download PDFInfo
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- CN106484019A CN106484019A CN201611068721.1A CN201611068721A CN106484019A CN 106484019 A CN106484019 A CN 106484019A CN 201611068721 A CN201611068721 A CN 201611068721A CN 106484019 A CN106484019 A CN 106484019A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
Abstract
A kind of linear voltage regulator is provided, this pressure regulator includes in the embodiment of the present application：Reference voltage generation unit, carries out voltage division processing, output reference voltage to the outside supply voltage accessing；Feedback regulation unit, between the first load based on described reference voltage and external series connection and the second load, the comparative result of voltage, is adjusted to the voltage between the first load and the second load；Described first load and the second load are connected between described reference voltage generation unit and feedback regulation unit；Voltage between described first load and the second load is as the output voltage of pressure regulator.Using the scheme in the application, formula linear voltage regulation effectively improves load supplying efficiency in parallel, meanwhile, in addition need not increase capacitance component on pcb board, reduce production cost, save the use space of pcb board.
Description
Technical field
The application is related to microelectric technique, in particular it relates to a kind of linear voltage regulator for microminiature equipment and pressure regulation
Method.
Background technology
The transformation that pressure regulator is widely used in load circuit as a kind of line-voltage regulator part is powered.But, right
When the voltage adjusting input power VIN to VIN/2 or below VIN/2 is to be powered circuit and power, the work of linear voltage regulator
Make efficiency will substantially reduce, work efficiency only 50% or lower.As shown in figure 1, being linear regulator circuit in prior art
Structure chart, as shown in Figure 1, when input power is reduced to VIN/2 for load supplying by conventional linear pressure regulator, it has half
Efficiency is slatterned by linear voltage regulator.
In order to meet the power voltage supply of VIN/2 or below VIN/2, in prior art, generally adopt charge pump conduct
The pressure regulation device of VIN/2 or below VIN/2, so can increase substantially power supplying efficiency.As shown in Fig. 2 1/2 in prior art
The charge pump of multiplying power includes input power VIN, switch S11, S12, S21, S22, electric capacity C1, Co, load Load.C1 is to fly electric capacity
(flying capacitor).Co is output capacitance.Clock signal CK1 and CK2 can be with alternate conduction, such as when respectively conducting is identical
Between.Figure it is seen that traditional charge pump needs at least one to fly electric capacity and an output capacitance, moved by flying electric capacity
Electric charge, thus realize energy transfer.The advantage of this miniature device is little, easy to use, the mass production one-tenth that takes up room
This is low；But, the use of these electric capacity can increase the occupancy to printed circuit board area, is unfavorable for compact apparatus, for example, blue
The production of tooth earphone；And application cost can be increased.
The shortcomings of the prior art is：
1st, the work efficiency that existing pressure regulation is powered will be too low it is impossible to meet load supplying demand；
2nd, existing pressure regulation power supply device takes up room greatly, and application cost height is it is impossible to meet the design needs of microminiature equipment.
Content of the invention
A kind of linear voltage regulator and pressure regulation method is provided, formula linear voltage regulation improves and bears in parallel in the embodiment of the present application
Carry power supplying efficiency, meanwhile, in addition need not increase capacitance component on pcb board, reduce production cost, save the use of pcb board
Space.
The invention provides a kind of linear voltage regulator, this pressure regulator includes：
Reference voltage generation unit, carries out voltage division processing, output reference voltage to the outside supply voltage accessing；
Feedback regulation unit, voltage between the first load based on described reference voltage and external series connection and the second load
Comparative result, is adjusted to the voltage between the first load and the second load；
Described first load and the second connected in series with the load, and access with outside with the parallel connection of described reference voltage generation unit
Power supply connects；
Voltage between described first load and the second load is as the output voltage of pressure regulator.
A kind of electric power system, this system includes：Power supply, the first resistor being connected in series and second resistance, and, string
The first load and the second load that connection connects；
The described first resistor being connected in series and second resistance are loaded simultaneously with described the first load and second being connected in series
Connection is connected on power supply：
It is connected with turn between the junction point of the junction point of first resistor and second resistance and the first load and the second load
Operational amplifier and metal-oxide-semiconductor；
The first input end of described operational amplifier is connected with the junction point of first resistor and second resistance, and described computing is put
The big outfan of device is connected with the grid of metal-oxide-semiconductor, and the second input of described operational amplifier is connected with the drain electrode of metal-oxide-semiconductor；Institute
The junction point stated between the drain electrode of metal-oxide-semiconductor and the first load and the second load is connected；
The source ground of described metal-oxide-semiconductor；Or, the source electrode of described metal-oxide-semiconductor is connected with power supply
Present invention also offers a kind of parallel linear voltage regulation method, the step of the method includes：
Voltage division processing is carried out to the supply voltage accessing, obtains reference voltage, meanwhile, obtain series connection and access external power source
Voltage between first load and the second load；
Based on the comparative result of voltage between described reference voltage and the first load and the second load, to the first load and the
Voltage between two loads is adjusted；
Voltage between described first load after adjusting and the second load is as pressure regulation output voltage.
Beneficial effects of the present invention are as follows：
Herein described scheme, load circuit is split as two dummy load, and access electricity of being connected in the way of being laminated
Source, adjusts the voltage between two dummy load by way of feedback regulation, thus realizing the real-time tune to pressure regulator output voltage
Whole.Dummy load after being split by rational allocation, is effectively improved the power supplying efficiency of load circuit, need not in addition exist meanwhile
Increase capacitance component on pcb board in linear voltage regulator, reduce production cost, save the use space of pcb board.
Brief description
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes the part of the application, this Shen
Schematic description and description please is used for explaining the application, does not constitute the improper restriction to the application.In the accompanying drawings：
Fig. 1 is the schematic diagram of conventional linear pressure regulator described in background of invention；
Fig. 2 is the schematic diagram of conventional charge pump described in background of invention；
Fig. 3 is the schematic diagram of laminated type linear voltage regulator described in the embodiment of the present invention 1；
Fig. 4 is the schematic diagram of laminated type linear voltage regulator described in the embodiment of the present invention 2.
1st, reference voltage generation unit, 2, feedback regulation unit.
Specific embodiment
In order that the technical scheme in the embodiment of the present application and advantage become more apparent, below in conjunction with accompanying drawing to the application
Exemplary embodiment be described in more detail it is clear that described embodiment be only the application a part enforcement
Example, rather than the exhaustion of all embodiments.It should be noted that in the case of not conflicting, the embodiment in the application and reality
Apply the feature in example can be mutually combined.
The core thinking of the present invention is using pressure regulator, the single load accessing power supply will to be powered in prior art
Mode, change into and the be connected in series first load LoadA and the second load LoadB accessed power supply and is powered, and utilize
Linear voltage regulator described in this programme, carries out feedback regulation to the output voltage being powered for double loads, realizes to input power
The regulation of the VIN/2 of VIN or below VIN/2 supply voltage.And then, a kind of linear voltage regulator and pressure regulation are provided in present example
Method, is described in detail below.
As shown in figure 3, providing a kind of linear voltage regulator in first example of the present invention, this pressure regulator includes：With reference to electricity
Pressure generation unit and feedback regulation unit；
Reference voltage generation unit is used for carrying out voltage division processing, output reference voltage to the outside supply voltage accessing.
Specifically, in this example, described reference voltage generation unit includes：First resistor R1 being connected in series and the second electricity
Resistance R2；Described first resistor R1 and second resistance R2 are connected in series with input power, by two resistance, input power are carried out
Voltage division processing；The junction point of described first resistor R1 and second resistance R2 is as the reference voltage of described reference voltage generation unit
Outfan is connected with described feedback regulation unit.In this programme, the resistance of described first resistor R1 and second resistance R2 can be
Equal or not etc..When first resistor R1 and second resistance R2 are equal, the mark of reference voltage generation unit output
Quasi- voltage is VIN/2.When first resistor R1 and second resistance R2 are unequal, the voltage of reference voltage generation unit output isI.e. according to user's needs, the resistance of adjustment first resistor R1 and second resistance R2, so that reference voltage is produced single
Normal voltage needed for unit's outputFor the further preferred scheme of this programme, described first resistor R1 and
Two resistance R2 can be arranged to adjustable resistance, to meet the pressure regulation demand of user's reality.Adjustment mode can be manual
Position is adjusted, presets regulation or automatically adjusted by controller, and the implementation of above-mentioned regulation scheme can pass through this area
The routine techniquess means that technical staff is grasped are realized.
Feedback regulation unit is mainly by the first load loadA of described reference voltage and external series connection and the second load
Between loadB, voltage is compared, and by comparative result, the voltage between the first load loadA and the second load loadB is entered
Row is adjusted.
Specifically, described feedback regulation unit includes：Operational amplifier OP and NMOS tube MN3；Described operational amplifier OP
Negative input end be connected with reference voltage generation unit as the input of described feedback regulation unit；Described operational amplifier OP
Outfan be connected with the grid of NMOS tube MNS, the drain electrode of the positive input terminal of described operational amplifier OP and NMOS tube MNS is even
Connect；The drain electrode of described NMOS tube MNS loads as the outfan of described feedback regulation unit and the first load loadA and second
Junction point between loadB connects；The source ground of described NMOS tube MNS.
It should be noted that when using feedback regulation unit described in first embodiment, needing to ensure described first
Load loadA is less than or equal to the second load loadB.
Described linear voltage regulator also includes：For the power interface being connected with external power source, for exporting voltage after pressure regulation
Voltage output interface, and for connect first load loadA and second load loadB two loading interfaces.
As shown in figure 3, in this example, resistance R1, R2 of described linear voltage regulator are equal, by first resistor R1 and second
The reference voltage VIN/2 that the reference voltage generation unit of resistance R2 composition produces.Operational amplifier OP compares VM voltage and VR electricity
Pressure, when VM voltage is more than VR voltage, operational amplifier OP output voltage raises, and leads to NMOS tube MN3 conducting electric current to increase, from
And by VM voltage pull-down；When VM voltage is less than VR voltage, operational amplifier OP output voltage reduces, and leads to NMOS tube MN3 to be led
Galvanization reduces, thus leading to VM voltage to rise.So form negative-feedback regu- lation, only when VM voltage is equal to VR voltage, electricity
Road enters steady statue.The resistance value of design resistance R1 and resistance R2 is equal, then VR voltage is equal to VIN/2, under steady statue, VM
It is also equal to VIN/2.
The current drain of hypothesis LoadA is IA, and the current drain of LoadB is IB, and the difference of both current drains is equal to Δ I,
I.e. Δ I=IA-IB
Computational efficiency is:
From above formula, if Δ I is less relative to IA, system power supply efficiency is higher.I.e. during segmentation load, two parts electricity
Stream consumes closer to then system power supply efficiency is higher.
Resistance R1, R2 of linear voltage regulator described in this example can be unequal, manually or automatically adjust first
Resistance R1 and second resistance R2 adjust to user to predetermined value, by the reference voltage of first resistor R1 and second resistance R2 composition
The reference voltage that generation unit producesBy feedback regulation unit to described reference voltage
And first being compared of voltage between load LoadA and the second load LoadB, and loaded to first by comparative result
Voltage between LoadA and second load LoadB is adjusted, thus realize described linear voltage regulator powering to below VIN/2
The regulation of voltage.Using the method adjusting on demand to first resistor R1 and second resistance R2, can meet simultaneously to VIN/2 with
The regulation of upper supply voltage, thus the power supply realizing each voltage section to input power of linear voltage regulator described in this programme is adjusted
Section.
As shown in figure 4, providing a kind of linear voltage regulator in second example of the present invention, this pressure regulator includes：With reference to electricity
Pressure generation unit, feedback regulation unit, power interface, voltage output interface and loading interfaces
Feedback regulation unit is mainly by electricity between described reference voltage and the first load loadA and the second load loadB
Pressure is compared, and by comparative result, the voltage between the first load loadA and the second load loadB is adjusted.
Specifically, described feedback regulation unit includes：Operational amplifier OP and PMOS MP5；
The negative input end of described operational amplifier operational amplifier OP is as the input of described feedback regulation unit and ginseng
Examine voltage generating unit to connect；The outfan of described operational amplifier operational amplifier OP is connected with the grid of PMOS MP5, institute
The drain electrode of the positive input terminal and PMOS MNS of stating operational amplifier OP is connected；The drain electrode of described PMOS MP5 is as described feedback
Junction point between the outfan of adjustment unit and the first load loadA and the second load loadB is connected；Described PMOS MP5
Source electrode be connected with power supply.
It should be noted that in using second embodiment during feedback regulation unit, needing to ensure described first load
LoadA is more than or equal to the second load loadB.
The composition portions such as the reference voltage generation unit described in second embodiment, power interface and voltage output interface
Point, with the selection condition of functional unit, device and interface described in first example or identical from mode.
As shown in figure 4, in this example, resistance R1, R2 of described linear voltage regulator are equal, by first resistor R1 and second
The reference voltage VIN/2 that the reference voltage generation unit of resistance R2 composition produces.Operational amplifier OP compares VM voltage and VR electricity
Pressure, when VM voltage is more than VR voltage, operational amplifier OP output voltage raises, and leads to PMOS MP5 conducting electric current to increase, from
And by VM voltage pull-down；When VM voltage is less than VR voltage, operational amplifier OP output voltage reduces, and leads to PMOS MP5 to be led
Galvanization reduces, thus leading to VM voltage to rise.So form negative-feedback regu- lation, only when VM voltage is equal to VR voltage, electricity
Road enters steady statue.The resistance value of design resistance R1 and resistance R2 is equal, then VR voltage is equal to VIN/2, under steady statue, VM
It is also equal to VIN/2.
The current drain of hypothesis LoadA is IA, and the current drain of LoadB is IB, and the difference of both current drains is equal to Δ I,
I.e. Δ I=IB-IA
Computational efficiency is:
From above formula, if Δ I is less relative to IA, system power supply efficiency is higher.I.e. during segmentation load, two parts electricity
Stream consumes closer to then system power supply efficiency is higher.
Resistance R1, R2 of linear voltage regulator described in this example can be unequal, manually or automatically adjust first
Resistance R1 and second resistance R2 adjust to user to predetermined value, by the reference voltage of first resistor R1 and second resistance R2 composition
The reference voltage that generation unit producesBy feedback regulation unit to described reference voltage
And first being compared of voltage between load LoadA and the second load LoadB, and loaded to first by comparative result
Voltage between LoadA and second load LoadB is adjusted, thus realize described linear voltage regulator powering to below VIN/2
The regulation of voltage.Using the method adjusting on demand to first resistor R1 and second resistance R2, can meet simultaneously to VIN/2 with
The regulation of upper supply voltage, thus the power supply realizing each voltage section to input power of linear voltage regulator described in this programme is adjusted
Third embodiment of the invention, provides a kind of electric power system, and this system includes：Power supply, being connected in series
One resistance R1 and second resistance R2, and, the first load LoadA being connected in series and the second load LoadB；
Described first resistor R1 being connected in series and second resistance R2 and described the first load LoadA being connected in series and the
Two load LoadB are connected in parallel on power supply：
The junction point of first resistor R1 and second resistance R2 and the junction point of the first load LoadA and the second load LoadB
Between be connected with operational amplifier OP and metal-oxide-semiconductor in turn；
The first input end of described operational amplifier OP is connected with the junction point of first resistor R1 and second resistance R2, described
The outfan of operational amplifier OP is connected with the grid of metal-oxide-semiconductor, second input of described operational amplifier OP and the leakage of metal-oxide-semiconductor
Pole connects；Junction point between the drain electrode of described metal-oxide-semiconductor and the first load LoadA and the second load LoadB is connected；
The source ground of described metal-oxide-semiconductor；Or, the source electrode of described metal-oxide-semiconductor is connected with power supply.
Four embodiment of the invention provides a kind of parallel linear voltage regulation method, and the step of the method includes：
S1, the supply voltage to access carry out voltage division processing, obtain reference voltage, meanwhile, obtain series connection and access external electrical
Voltage between first load in source and the second load；
S2, the comparative result based on voltage between described reference voltage and the first load and the second load, load to first
Voltage and the second load between is adjusted；
S3, will adjust after described first load and second load between voltage as pressure regulation output voltage.
In this example, described reference voltage is 1/2nd of outside access supply voltage.
In this example, the described step that voltage between first load and the second load is adjusted includes：
When S41, the voltage between the first load and the second load are more than reference voltage, then reduce the first load and second
Voltage between load；
When S42, the voltage between the first load and the second load are less than reference voltage, then raise the first load and second
Voltage between load.
For convenience of description, each several part of apparatus described above is divided into various modules or unit to be respectively described with function.
Certainly, the function of each module or unit can be realized in same or multiple softwares or hardware when implementing the present invention.
Technical scheme provided in an embodiment of the present invention, in parallel formula linear voltage regulation effectively improve load supplying efficiency,
Meanwhile, in addition need not increase capacitance component on pcb board, reduce production cost, save the use space of pcb board.
Those skilled in the art are it should be appreciated that embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can be using complete hardware embodiment, complete software embodiment or the reality combining software and hardware aspect
Apply the form of example.And, the application can be using in one or more computers wherein including computer usable program code
The upper computer program implemented of usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) produces
The form of product.
The application is the flow process with reference to method, equipment (system) and computer program according to the embodiment of the present application
Figure and/or block diagram are describing.It should be understood that can be by each stream in computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor instructing general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device is to produce
A raw machine is so that produced for reality by the instruction of computer or the computing device of other programmable data processing device
The device of the function of specifying in present one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing device with spy
Determine in the computer-readable memory that mode works so that the instruction generation inclusion being stored in this computer-readable memory refers to
Make the manufacture of device, this command device realize in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or
The function of specifying in multiple square frames.
These computer program instructions also can be loaded in computer or other programmable data processing device so that counting
On calculation machine or other programmable devices, execution series of operation steps to be to produce computer implemented process, thus in computer or
On other programmable devices, the instruction of execution is provided for realizing in one flow process of flow chart or multiple flow process and/or block diagram one
The step of the function of specifying in individual square frame or multiple square frame.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to including excellent
Select embodiment and fall into being had altered and changing of the application scope.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the application to the application
God and scope.So, if these modifications of the application and modification belong to the scope of the application claim and its equivalent technologies
Within, then the application is also intended to comprise these changes and modification.
Claims (10)
1. a kind of linear voltage regulator is it is characterised in that this pressure regulator includes：
Reference voltage generation unit, carries out voltage division processing, output reference voltage to the outside supply voltage VIN accessing；
Feedback regulation unit, the comparison of voltage between the first load based on described reference voltage and external series connection and the second load
As a result, the voltage between the first load and the second load is adjusted；
Described first load and the second connected in series with the load, and access power supply with described reference voltage generation unit parallel connection with outside
Connect；
Voltage between described first load and the second load is as the output voltage of pressure regulator.
2. pressure regulator according to claim 1 is it is characterised in that described reference voltage generation unit includes：
First resistor R1 being connected in series and second resistance R2；
The junction point of described first resistor R1 and second resistance R2 as described reference voltage generation unit outfan with described
Feedback regulation unit connects.
3. pressure regulator according to claim 2 is it is characterised in that when described first resistor R1 and second resistance R2 are equal,
The output voltage of pressure regulator is VIN/2.
4. pressure regulator according to claim 1 is it is characterised in that described feedback regulation unit includes：Operational amplifier and
NMOS tube；
The first input end of described operational amplifier is as input and the reference voltage generation unit of described feedback regulation unit
Connect；
The outfan of described operational amplifier is connected with the grid of NMOS tube, the second input of described operational amplifier and NMOS
The drain electrode of pipe connects；
The drain electrode of described NMOS tube loads the company and the second load between as the outfan and first of described feedback regulation unit
Contact connects；
The source ground of described NMOS tube.
5. pressure regulator according to claim 4 is it is characterised in that described first load is less than or equal to the second load.
6. pressure regulator according to claim 1 is it is characterised in that described feedback regulation unit includes：Operational amplifier and
PMOS；
The first input end of described operational amplifier is as input and the reference voltage generation unit of described feedback regulation unit
Connect；
The outfan of described operational amplifier is connected with the grid of PMOS, the second input of described operational amplifier and PMOS
The drain electrode of pipe connects；
The drain electrode of described PMOS loads the company and the second load between as the outfan and first of described feedback regulation unit
Contact connects；
The source electrode of described PMOS is connected with external power supply.
7. pressure regulator according to claim 6 is it is characterised in that described first load is more than or equal to the second load.
8. a kind of electric power system is it is characterised in that this system includes：Power supply, the first resistor being connected in series and the second electricity
Resistance, and, the first load being connected in series and second loads；
The described first resistor being connected in series and second resistance are in parallel even with described the first load being connected in series and the second load
It is connected on power supply：
It is connected with computing in turn between the junction point of the junction point of first resistor and second resistance and the first load and the second load
Amplifier and metal-oxide-semiconductor；
The first input end of described operational amplifier is connected with the junction point of first resistor and second resistance, described operational amplifier
Outfan be connected with the grid of metal-oxide-semiconductor, the second input of described operational amplifier is connected with the drain electrode of metal-oxide-semiconductor；Described MOS
Junction point between the drain electrode of pipe and the first load and the second load is connected；
The source ground of described metal-oxide-semiconductor；Or, the source electrode of described metal-oxide-semiconductor is connected with power supply.
9. a kind of parallel linear voltage regulation method is it is characterised in that the step of the method includes：
Voltage division processing is carried out to the supply voltage accessing, obtains reference voltage, meanwhile, obtain the first of series connection access external power source
Voltage between load and the second load；
Based on the comparative result of voltage between described reference voltage and the first load and the second load, negative with second to the first load
Voltage between load is adjusted；When voltage between the first load and the second load is more than reference voltage, then reduce by first
Voltage between load and the second load；When voltage between the first load and the second load is less than reference voltage, then raise
Voltage between first load and the second load；
Voltage between described first load after adjusting and the second load is as pressure regulation output voltage.
10. method according to claim 9 is it is characterised in that described reference voltage is the two of outside access supply voltage
/ mono-.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106484019B (en) | 2019-05-21 |
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