CN108803762A - A kind of low pressure difference linear voltage regulator and method for stabilizing voltage - Google Patents
A kind of low pressure difference linear voltage regulator and method for stabilizing voltage Download PDFInfo
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- CN108803762A CN108803762A CN201810732250.2A CN201810732250A CN108803762A CN 108803762 A CN108803762 A CN 108803762A CN 201810732250 A CN201810732250 A CN 201810732250A CN 108803762 A CN108803762 A CN 108803762A
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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
The present invention provides a kind of low pressure difference linear voltage regulator LDO and method for stabilizing voltage.The LDO includes voltage compensating circuit and regulator circuit, and the output end of the regulator circuit connects external equipment by circuit board line；The voltage compensating circuit, the loss voltage for determining the circuit board line, and compensated according to the first reference voltage of the loss voltage pair to obtain the second reference voltage；The regulator circuit, the output voltage for adjusting the LDO according to second reference voltage.Through the embodiment of the present invention, no matter how the operating current of external equipment changes, i.e., how the load current of LDO changes, and a stable input voltage can be obtained in the input terminal of external equipment, to ensure that power supply system is stable, reliable.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of low pressure difference linear voltage regulators and method for stabilizing voltage.
Background technology
In the power supply system of mobile terminal, PMIC (Power Management IC, power management integrated circuit) is provided
The LDO (Low dropout regulator, low pressure difference linear voltage regulator) of multichannel difference output voltage, per the output of LDO all the way
End is connected to external equipment by PCB (Printed Circuit Board, printed circuit board) cabling, powers for external equipment.
Under normal circumstances, the voltage that LDO is input to external equipment is stable.But since PCB trace is there are resistance,
When the variation of the load current of external equipment, inputting the voltage of external equipment can also change therewith, to cause power supply to be
That unites is unstable.
Invention content
A kind of low pressure difference linear voltage regulator of offer of the embodiment of the present invention and method for stabilizing voltage, to solve external in the prior art set
Standby input voltage changes with load current, causes the problem that power supply system is unstable.
In order to solve the above-mentioned technical problem, the embodiment of the present invention is realized in：
In a first aspect, an embodiment of the present invention provides a kind of low pressure difference linear voltage regulator LDO, the LDO includes that voltage is mended
Circuit and regulator circuit are repaid, the output end of the regulator circuit connects external equipment by circuit board line；
The voltage compensating circuit, the loss voltage for determining the circuit board line, and according to the loss voltage
First reference voltage is compensated to obtain the second reference voltage；
The regulator circuit, the output voltage for adjusting the LDO according to second reference voltage.
Second aspect, an embodiment of the present invention provides a kind of method for stabilizing voltage, being applied to such as above-mentioned LDO, the LDO includes
The output end of voltage compensating circuit and regulator circuit, the regulator circuit connects external equipment by circuit board line；The side
Method includes：
According to the voltage compensating circuit, the loss voltage of the circuit board line is determined, and according to the loss voltage
First reference voltage is compensated, the second reference voltage is obtained；
The regulator circuit adjusts the output voltage of the LDO according to second reference voltage.
The third aspect, an embodiment of the present invention provides a kind of power management chips, which is characterized in that the power management core
Piece includes multiple such as above-mentioned LDO.
Fourth aspect, an embodiment of the present invention provides a kind of mobile terminals, which is characterized in that the mobile terminal includes such as
Above-mentioned power management chip.
In embodiments of the present invention, LDO includes voltage compensating circuit and regulator circuit, and voltage compensating circuit determines circuit board
The loss voltage of line, and compensate to obtain the second reference voltage, regulator circuit according to loss the first reference voltage of voltage pair
Output voltage is adjusted according to the second reference voltage.Through the embodiment of the present invention, no matter how the operating current of external equipment changes,
I.e. how the load current of LDO changes, and a stable input voltage can be obtained in the input terminal of external equipment, to ensure
Power supply system is stable, reliable.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by institute in the description to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of one of the structural schematic diagram of low pressure difference linear voltage regulator of the embodiment of the present invention one；
Fig. 2 is a kind of second structural representation of low pressure difference linear voltage regulator of the embodiment of the present invention one；
Fig. 3 is a kind of third structural representation of low pressure difference linear voltage regulator of the embodiment of the present invention one；
Fig. 4 is a kind of step flow chart of method for stabilizing voltage of the embodiment of the present invention two；
Fig. 5 is a kind of structural schematic diagram of power management chip of the embodiment of the present invention three；
Fig. 6 is a kind of hardware architecture diagram of mobile terminal of the embodiment of the present invention four.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment one
Referring to Fig.1, the structural schematic diagram of low pressure difference linear voltage regulator LDO provided in an embodiment of the present invention a kind of is shown.
The LDO includes voltage compensating circuit 11 and regulator circuit 12, and the output end of the regulator circuit 12 passes through circuit board line 21
Connect external equipment 22；
The voltage compensating circuit 11, the loss voltage for determining the circuit board line 21, and according to the loss
The first reference voltage of voltage pair is compensated to obtain the second reference voltage；
The regulator circuit 12, the output voltage for adjusting the LDO according to second reference voltage.
In the present embodiment, LDO connects external equipment 22 by circuit board line 21, since circuit board line 21 has electricity
Resistance, the load current of operating current, that is, LDO of external equipment 22 can generate pressure drop on circuit board line 21, that is to say, that external
A part can be lost compared with the output voltage of LDO in the input voltage of equipment 22 on circuit board line 21.For example, LDO is exported
Voltage is Va, and the input voltage of external equipment is Vb, and loss voltage is Vab, then Vb=Va-Vab.Therefore, even if the output of LDO
Voltage stabilization, but since the loss voltage on circuit board line 21 is different actually enters the voltage of external equipment 22 also not
Together, if the input voltage of external equipment 22 is less than the operating voltage of external equipment 22, it is unstable to may result in power supply system.
Existing LDO's is internally provided with a reference source, and the first reference voltage V ref1 is generated by a reference source.Lead in the present embodiment
Overvoltage compensation circuit 11 compensates the first reference voltage V ref1, obtains the second reference voltage V ref2, regulator circuit 12
According to the output voltage Va of the second reference voltage V ref2 adjustment LDO output end vos ut.Therefore, no matter the work electricity of external equipment
Stream is how the load current of LDO changes, and the output voltage of LDO is compensated according to the loss voltage of circuit board line
It crosses, it is all stable to be input to the input voltage of external equipment, ensure that the reliable and stable of power supply system.
Optionally, Fig. 2 shows a kind of structural schematic diagram of low pressure difference linear voltage regulator provided in an embodiment of the present invention, institutes
It includes operation sub-circuit 111 and compensation sub-circuit 112 to state voltage compensating circuit 11；
The operation sub-circuit 111 compensates electricity for calculating the loss voltage, and according to the loss voltage output
Pressure；
The compensation sub-circuit 112 is obtained for being compensated to first reference voltage according to the offset voltage
Second reference voltage.
In the present embodiment, voltage compensating circuit 11 divides for two parts：Operation sub-circuit 111 and compensation sub-circuit 112.Operation
111 computed losses voltage of sub-circuit, and according to loss voltage output offset voltage.For example, loss voltage Vab, offset voltage
Vc, penalty coefficient A, then Vc=A*Vab.Compensation circuit 112 is compensated according to the first reference voltage of offset voltage pair.Example
Such as, offset voltage Vc, the first reference voltage V ref1 then obtain the second reference voltage V ref2=Vref1+Vc.Compensate sub-circuit
112 add circuits that operational amplifier composition may be used realize that the embodiment of the present invention does not limit this in detail, can basis
Actual conditions are chosen.
Optionally, Fig. 3 shows a kind of structural schematic diagram of low pressure difference linear voltage regulator provided in an embodiment of the present invention, institute
It includes current detecting unit 1111, resistance acquiring unit 1112, voltage output unit 1113 to state operation sub-circuit 111；
The input terminal of the voltage output unit 1113 is obtained with the current detecting unit 1111 and the resistance respectively
Unit 1112 is electrically connected, and the output end of the voltage output unit 1113 is electrically connected with the compensation sub-circuit 112；
The current detecting unit 1111, the load current for detecting the LDO；
The resistance acquiring unit 1112, the resistance value for obtaining the circuit board line；
The voltage output unit 1113, for being calculated according to the resistance value of the load current and the circuit board line
The loss voltage exports the offset voltage according to the loss voltage to the compensation sub-circuit 112.
In the present embodiment, current detecting unit 1111 detects the load current of LDO, and current detecting unit 1111 can be arranged
In the input terminal of LDO, the output end in LDO can also be set.The embodiment of the present invention does not limit this in detail, can be according to reality
Border situation is configured.Circuit board line can be calculated according to the length of existing circuit board line, width and resistrivity meter
Resistance value can also be designed circuit board line by emulation, to obtain the resistance value of circuit board line.By circuit board
The resistance value of line stores in the register for corresponding to the LDO to power management chip, and resistance acquiring unit 1112 can be from deposit
The resistance value of reading circuit plate line in device.Voltage output unit 1113 can according to the resistance value of load current and circuit board line
To calculate the voltage value of loss voltage, and offset voltage is exported to compensation sub-circuit 112.For example, load current is I, circuit
The resistance value of plate line is R, then voltage Vab=I*R, offset voltage Vc=A*I*R is lost.
Optionally, with reference to Fig. 3, the regulator circuit 12 includes error amplifier 121, feedback circuit 122 and control device
123；
The normal phase input end of the error amplifier 121 is electrically connected with the compensation sub-circuit 112, the error amplifier
121 inverting input is electrically connected with one end of the feedback circuit 122, the output end of the error amplifier 121 with it is described
Control device 123 is electrically connected；The other end of the feedback circuit 122 is electrically connected with the output end vo ut of the LDO；The control
Device 123 also distinguishes input terminal Vin and the output end vo ut electrical connections of the LDO；
The error amplifier 121, for the feedback voltage according to second reference voltage and the feedback circuit 122
Control the control device 123；
The feedback circuit 122, it is described for being fed back to the error amplifier 121 according to the output voltage of the LDO
Feedback voltage；
The control device 123, the output voltage for adjusting the LDO under the control of the error amplifier 121.
In the present embodiment, feedback circuit 122 feeds back feedback voltage according to the output voltage of LDO to error amplifier 121, accidentally
Poor amplifier 121 is compared the second reference voltage and feedback voltage.When the second reference voltage and equal feedback voltage, accidentally
Poor amplifier 121 exports fixed voltage, and control device 123 is in fixed conducting state under the control of error amplifier 121,
The output voltage of LDO is also at stable state.When the output voltage of LDO reduces, feedback voltage becomes smaller, and feedback voltage is less than the
Two reference voltages, then the output voltage raising of error amplifier 121, control device 123 are lowered in the control of error amplifier 121
Big output voltage, to make the output voltage of LDO increase, the output voltage of LDO is still in stable state.When the output electricity of LDO
When pressure increases, feedback voltage becomes larger, and feedback voltage is more than the second reference voltage, then the output voltage of error amplifier 121 reduces,
Control device 123 turns output voltage down under the control of error amplifier 121, to make the output voltage of LDO reduce, LDO's
Output voltage is still in stable state.Control device can be metal-oxide-semiconductor, and the embodiment of the present invention does not limit this in detail, can be with
It is chosen according to actual conditions.
Optionally, with reference to Fig. 3, the feedback circuit 122 includes first resistor and second resistance；
The both ends of the first resistor Ra are defeated with the inverting input of the error amplifier 121 and the LDO respectively
Outlet is electrically connected；The both ends of the second resistance Rb are electric with the inverting input of the error amplifier 121 and ground terminal respectively
Connection.
In the present embodiment, the resistance value of first resistor Ra and second resistance Rb are chosen according to actual conditions.When selected
After resistance value, penalty coefficient A is Rb/ (Ra+Rb), and voltage Vc=Vab*Rb/ (Ra+Rb) is compensated according to loss voltage Vab
=I*R*Rb/ (Ra+Rb), feedback voltage Vfb=Va*Rb/ (Ra+Rb).When the output voltage stabilization of LDO, error amplifier 121
The voltage of inverting input is equal with the voltage of normal phase input end, i.e., feedback voltage is equal to the second reference voltage, obtains Vfb=
Vref2, i.e. Va*Rb/ (Ra+Rb)=Vref1+Vc=Vref1+I*R*Rb/ (Ra+Rb), therefore Va=(Ra+Rb)/Rb*
Vref1+I*R, due to Vb=Va-Vab, Vab=I*R, then Vb=(Ra+Rb)/Rb*Vref1.As it can be seen that external equipment 22 is defeated
It is only related to the first reference voltage V ref1, first resistor Ra and second resistance Rb to enter low-voltage Vb, therefore the input of external equipment
Voltage is stable after the first reference voltage V ref1, first resistor Ra and second resistance Rb are determined.
In conclusion in the embodiment of the present invention, LDO includes voltage compensating circuit and regulator circuit, and voltage compensating circuit is true
Determine the loss voltage of circuit board line, and compensate to obtain the second reference voltage according to loss the first reference voltage of voltage pair,
Regulator circuit adjusts the output voltage of LDO according to the second reference voltage.Through the embodiment of the present invention, no matter the work of external equipment
How electric current changes, i.e., how the load current of LDO changes, and a stable input can be obtained in the input terminal of external equipment
Voltage, to ensure that power supply system is stable, reliable.
Embodiment two
With reference to Fig. 4, a kind of step flow chart of method for stabilizing voltage provided in an embodiment of the present invention is shown.Applied to such as implementation
LDO described in example one, the LDO include voltage compensating circuit 11 and regulator circuit 12, and the output end of the regulator circuit 12 is logical
Oversampling circuit plate line 21 connects external equipment 22；The method includes：
Step 201, according to the voltage compensating circuit 11, the loss voltage of the circuit board line 21 is determined, and according to
The first reference voltage of the loss voltage pair compensates, and obtains the second reference voltage.
In the present embodiment, voltage compensating circuit 11 determines the loss voltage Vab of circuit board line 21, specifically, detects institute
The load current of LDO is stated, and obtains the resistance value of the circuit board line；Connected according to the load current and the circuit board
The resistance value of line calculates the loss voltage on the circuit board line.For example, load current I, the resistance R of circuit board line, damage
Vab=I*R is pressed in power consumption.It is compensated voltage according to loss voltage, then is compensated using the first reference voltage of offset voltage pair,
The second reference voltage is obtained, for example, loss voltage Vab, offset voltage Vc, penalty coefficient A, then Vc=A*Vab；First benchmark
Voltage Vref1 then obtains the second reference voltage V ref2=Vref1+Vc.
Step 202, the regulator circuit 12 adjusts the output voltage of the LDO according to second reference voltage.
In the present embodiment, regulator circuit 12 includes error amplifier 121, feedback circuit 122 and control device 123；Instead
Current feed circuit 122 includes first resistor Ra and second resistance Rb.Feedback circuit 122 is determined according to the output voltage of the LDO to be fed back
Voltage.For example, the output voltage Va of LDO, feedback voltage Vfb=A*Va=Va*Rb/ (Ra+Rb).121 basis of error amplifier
The second reference voltage V ref2 and the feedback voltage Vfb adjust the output voltage Va of the LDO.Specifically, error is amplified
The normal phase input end of device 121 inputs the second reference voltage V ref2, reversed-phase output input feedback voltage Vfb, error amplifier
121 compare the second reference voltage V ref2 and feedback voltage Vfb, control control device according to comparison result so that control device tune
The output voltage Va of whole LDO.
In conclusion in the embodiment of the present invention, voltage compensating circuit determines the loss voltage of circuit board line, and according to damage
The first reference voltage of power consumption pressure pair compensates, and obtains the second reference voltage；Regulator circuit adjusts defeated according to the second reference voltage
Go out voltage.No matter how the operating current of external equipment changes, i.e., how the load current of LDO changes, in the defeated of external equipment
A stable input voltage can be obtained by entering end, to ensure that power supply system is stable, reliable.
Embodiment three
With reference to Fig. 5, the embodiment of the present invention provides a kind of structure diagram of power management chip.The power management chip packet
Include multiple LDO as described in embodiment one.
In this implementation, power management chip 30 may include multiple LDO, for example, LDO1, LDO2, LDO3, LDO4, LDO is logical
Oversampling circuit plate line connects external equipment.In view of the loss voltage on circuit board line, the first reference voltage of LDO is carried out
Compensation obtains the second reference voltage so that LDO can adjust the output voltage of LDO according to the second reference voltage, and then ensure outer
The stabilized input voltage of portion's equipment, it is unrelated with the resistance of load current and circuit board line.
In conclusion in the embodiment of the present invention, power management chip includes multiple LDO, the external equipment of each LDO connections
Input voltage is all stable, and power management chip is reliable and stable.
Example IV
An embodiment of the present invention provides a kind of mobile terminals.The mobile terminal includes the power supply pipe as described in embodiment three
Manage chip.
A kind of hardware architecture diagram of Fig. 6 mobile terminals of each embodiment to realize the present invention,
The mobile terminal 400 includes but not limited to：It is radio frequency unit 401, network module 402, audio output unit 403, defeated
Enter unit 404, sensor 405, display unit 406, user input unit 407, interface unit 408, memory 409, processor
The components such as 410 and power supply 411.It will be understood by those skilled in the art that mobile terminal structure shown in Fig. 6 is not constituted
Restriction to mobile terminal, mobile terminal may include than illustrating more or fewer components, either combine certain components or
Different component arrangements.In embodiments of the present invention, mobile terminal include but not limited to mobile phone, tablet computer, laptop,
Palm PC, car-mounted terminal, wearable device and pedometer etc..
It should be understood that the embodiment of the present invention in, radio frequency unit 401 can be used for receiving and sending messages or communication process in, signal
Send and receive, specifically, by from base station downlink data receive after, to processor 410 handle；In addition, by uplink
Data are sent to base station.In general, radio frequency unit 401 includes but not limited to antenna, at least one amplifier, transceiver, coupling
Device, low-noise amplifier, duplexer etc..In addition, radio frequency unit 401 can also by radio communication system and network and other set
Standby communication.
Mobile terminal has provided wireless broadband internet to the user by network module 402 and has accessed, and such as user is helped to receive
Send e-mails, browse webpage and access streaming video etc..
It is that audio output unit 403 can receive radio frequency unit 401 or network module 402 or in memory 409
The audio data of storage is converted into audio signal and exports to be sound.Moreover, audio output unit 403 can also be provided and be moved
The relevant audio output of specific function that dynamic terminal 400 executes is (for example, call signal receives sound, message sink sound etc.
Deng).Audio output unit 403 includes loud speaker, buzzer and receiver etc..
Input unit 404 is for receiving audio or video signal.Input unit 404 may include graphics processor
(Graphics Processing Unit, GPU) 4041 and microphone 4042, graphics processor 4041 is in video acquisition mode
Or the image data of the static images or video obtained by image capture apparatus (such as camera) in image capture mode carries out
Reason.Treated, and picture frame may be displayed on display unit 406.Through graphics processor 4041, treated that picture frame can be deposited
Storage is sent in memory 409 (or other storage mediums) or via radio frequency unit 401 or network module 402.Mike
Wind 4042 can receive sound, and can be audio data by such acoustic processing.Treated audio data can be
The format output of mobile communication base station can be sent to via radio frequency unit 401 by being converted in the case of telephone calling model.
Mobile terminal 400 further includes at least one sensor 405, such as optical sensor, motion sensor and other biographies
Sensor.Specifically, optical sensor includes ambient light sensor and proximity sensor, wherein ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 4061, and proximity sensor can close when mobile terminal 400 is moved in one's ear
Display panel 4061 and/or backlight.As a kind of motion sensor, accelerometer sensor can detect in all directions (general
For three axis) size of acceleration, size and the direction of gravity are can detect that when static, can be used to identify mobile terminal posture (ratio
Such as horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, tap)；It passes
Sensor 405 can also include fingerprint sensor, pressure sensor, iris sensor, molecule sensor, gyroscope, barometer, wet
Meter, thermometer, infrared sensor etc. are spent, details are not described herein.
Display unit 406 is for showing information input by user or being supplied to the information of user.Display unit 406 can wrap
Display panel 4061 is included, liquid crystal display (Liquid Crystal Display, LCD), Organic Light Emitting Diode may be used
Forms such as (Organic Light-Emitting Diode, OLED) configure display panel 4061.
User input unit 407 can be used for receiving the number or character information of input, and generate the use with mobile terminal
Family is arranged and the related key signals input of function control.Specifically, user input unit 407 include touch panel 4071 and
Other input equipments 4072.Touch panel 4071, also referred to as touch screen collect user on it or neighbouring touch operation
(for example user uses any suitable objects or attachment such as finger, stylus on touch panel 4071 or in touch panel 4071
Neighbouring operation).Touch panel 4071 may include both touch detecting apparatus and touch controller.Wherein, touch detection
Device detects the touch orientation of user, and detects the signal that touch operation is brought, and transmits a signal to touch controller；Touch control
Device processed receives touch information from touch detecting apparatus, and is converted into contact coordinate, then gives processor 410, receiving area
It manages the order that device 410 is sent and is executed.Furthermore, it is possible to more using resistance-type, condenser type, infrared ray and surface acoustic wave etc.
Type realizes touch panel 4071.In addition to touch panel 4071, user input unit 407 can also include other input equipments
4072.Specifically, other input equipments 4072 can include but is not limited to physical keyboard, function key (such as volume control button,
Switch key etc.), trace ball, mouse, operating lever, details are not described herein.
Further, touch panel 4071 can be covered on display panel 4061, when touch panel 4071 is detected at it
On or near touch operation after, send processor 410 to determine the type of touch event, be followed by subsequent processing device 410 according to touch
The type for touching event provides corresponding visual output on display panel 4061.Although in figure 3, touch panel 4071 and display
Panel 4061 is to realize the function that outputs and inputs of mobile terminal as two independent components, but in some embodiments
In, can be integrated by touch panel 4071 and display panel 4061 and realize the function that outputs and inputs of mobile terminal, it is specific this
Place does not limit.
Interface unit 408 is the interface that external device (ED) is connect with mobile terminal 400.For example, external device (ED) may include having
Line or wireless head-band earphone port, external power supply (or battery charger) port, wired or wireless data port, storage card end
Mouth, port, the port audio input/output (I/O), video i/o port, earphone end for connecting the device with identification module
Mouthful etc..Interface unit 408 can be used for receiving the input (for example, data information, electric power etc.) from external device (ED) and
By one or more elements that the input received is transferred in mobile terminal 400 or can be used in 400 He of mobile terminal
Transmission data between external device (ED).
Memory 409 can be used for storing software program and various data.Memory 409 can include mainly storing program area
And storage data field, wherein storing program area can storage program area, application program (such as the sound needed at least one function
Sound playing function, image player function etc.) etc.；Storage data field can store according to mobile phone use created data (such as
Audio data, phone directory etc.) etc..In addition, memory 409 may include high-speed random access memory, can also include non-easy
The property lost memory, a for example, at least disk memory, flush memory device or other volatile solid-state parts.
Processor 410 is the control centre of mobile terminal, utilizes each of various interfaces and the entire mobile terminal of connection
A part by running or execute the software program and/or module that are stored in memory 409, and calls and is stored in storage
Data in device 409 execute the various functions and processing data of mobile terminal, to carry out integral monitoring to mobile terminal.Place
Reason device 410 may include one or more processing units；Preferably, processor 410 can integrate application processor and modulatedemodulate is mediated
Manage device, wherein the main processing operation system of application processor, user interface and application program etc., modem processor is main
Processing wireless communication.It is understood that above-mentioned modem processor can not also be integrated into processor 410.
Mobile terminal 400 can also include the power supply 411 (such as battery) powered to all parts, it is preferred that power supply 411
Can be logically contiguous by power-supply management system and processor 410, to realize management charging by power-supply management system, put
The functions such as electricity and power managed.
In addition, mobile terminal 400 includes some unshowned function modules, details are not described herein.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements include not only those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including this
There is also other identical elements in the process of element, method, article or device.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on this understanding, technical scheme of the present invention substantially in other words does the prior art
Going out the part of contribution can be expressed in the form of software products, which is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions are used so that a station terminal (can be mobile phone, computer, service
Device, air conditioner or network equipment etc.) execute method described in each embodiment of the present invention.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited in above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (10)
1. a kind of low pressure difference linear voltage regulator LDO, which is characterized in that the LDO includes voltage compensating circuit and regulator circuit, institute
The output end for stating regulator circuit connects external equipment by circuit board line；
The voltage compensating circuit, the loss voltage for determining the circuit board line, and according to the loss voltage pair
One reference voltage is compensated to obtain the second reference voltage；
The regulator circuit, the output voltage for adjusting the LDO according to second reference voltage.
2. LDO according to claim 1, which is characterized in that the voltage compensating circuit includes operation sub-circuit and compensation
Sub-circuit；
The operation sub-circuit, for calculating the loss voltage, and according to the loss voltage output offset voltage；
The compensation sub-circuit obtains described for being compensated to first reference voltage according to the offset voltage
Two reference voltages.
3. LDO according to claim 2, which is characterized in that the operation sub-circuit includes that current detecting unit, resistance obtain
Take unit, voltage output unit；
The input terminal of the voltage output unit is electrically connected with the current detecting unit and the resistance acquiring unit respectively, institute
The output end for stating voltage output unit is electrically connected with the compensation sub-circuit；
The current detecting unit, the load current for detecting the LDO；
The resistance acquiring unit, the resistance value for obtaining the circuit board line；
The voltage output unit, for calculating the loss according to the resistance value of the load current and the circuit board line
Voltage exports the offset voltage according to the loss voltage to the compensation sub-circuit.
4. circuit according to claim 3, which is characterized in that the regulator circuit includes error amplifier, feedback circuit
And control device；
The normal phase input end of the error amplifier is electrically connected with the compensation sub-circuit, the anti-phase input of the error amplifier
End is electrically connected with one end of the feedback circuit, and the output end of the error amplifier is electrically connected with the control device；It is described
The other end of feedback circuit is electrically connected with the output end of the LDO；The control device also respectively with the input terminal of the LDO and
Output end is electrically connected；
The error amplifier, for controlling the control according to the feedback voltage of second reference voltage and the feedback circuit
Device processed；
The feedback circuit, for feeding back the feedback voltage to the error amplifier according to the output voltage of the LDO；
The control device, the output voltage for adjusting the LDO under the control of the error amplifier.
5. circuit according to claim 4, which is characterized in that the feedback circuit includes first resistor and second resistance；
Output end of the both ends of the first resistor respectively with the inverting input of the error amplifier and the LDO is electrically connected
It connects；The both ends of the second resistance are electrically connected with the inverting input of the error amplifier and ground terminal respectively.
6. a kind of method for stabilizing voltage, which is characterized in that be applied to LDO as described in any one in claim 1-5, the LDO includes
The output end of voltage compensating circuit and regulator circuit, the regulator circuit connects external equipment by circuit board line；The side
Method includes：
According to the voltage compensating circuit, the loss voltage of the circuit board line is determined, and according to the loss voltage pair
One reference voltage compensates, and obtains the second reference voltage；
The regulator circuit adjusts the output voltage of the LDO according to second reference voltage.
7. according to the method described in claim 6, it is characterized in that, the loss voltage of the determination circuit board line, packet
It includes：
The load current of the LDO is detected, and
Obtain the resistance value of the circuit board line；
The loss voltage on the circuit board line is calculated according to the resistance value of the load current and the circuit board line.
8. circuit according to claim 6, which is characterized in that described to adjust output electricity according to second reference voltage
Pressure, including：
Feedback voltage is determined according to the output voltage of the LDO；
The output voltage of the LDO is adjusted according to second reference voltage and the feedback voltage.
9. a kind of power management chip, which is characterized in that the power management chip includes multiple such as any one of claim 1-5
The LDO.
10. a kind of mobile terminal, which is characterized in that the mobile terminal includes power management chip as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810732250.2A CN108803762A (en) | 2018-07-05 | 2018-07-05 | A kind of low pressure difference linear voltage regulator and method for stabilizing voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810732250.2A CN108803762A (en) | 2018-07-05 | 2018-07-05 | A kind of low pressure difference linear voltage regulator and method for stabilizing voltage |
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| Publication Number | Publication Date |
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| CN108803762A true CN108803762A (en) | 2018-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810732250.2A Pending CN108803762A (en) | 2018-07-05 | 2018-07-05 | A kind of low pressure difference linear voltage regulator and method for stabilizing voltage |
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| CN (1) | CN108803762A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688558A (en) * | 2020-12-16 | 2021-04-20 | 维沃移动通信有限公司 | Voltage regulation method, voltage regulation circuit, electronic device, and readable storage medium |
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| CN102375463A (en) * | 2010-08-13 | 2012-03-14 | 李尔公司 | System and method for controlling the output voltage of a power supply |
| CN103166451A (en) * | 2011-12-16 | 2013-06-19 | 富泰华工业（深圳）有限公司 | Switching power source circuit |
| CN203445784U (en) * | 2013-09-29 | 2014-02-19 | 惠州市德赛西威汽车电子有限公司 | Power supply circuit having line loss compensation function |
| CN105373177A (en) * | 2014-08-07 | 2016-03-02 | 济南芯驰能源科技有限公司 | An automatic circuit voltage drop compensating circuit for an aircraft ground static inverter |
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| JPH0934565A (en) * | 1995-07-21 | 1997-02-07 | Nec Shizuoka Ltd | Stabilized power circuit |
| CN102375463A (en) * | 2010-08-13 | 2012-03-14 | 李尔公司 | System and method for controlling the output voltage of a power supply |
| CN103166451A (en) * | 2011-12-16 | 2013-06-19 | 富泰华工业（深圳）有限公司 | Switching power source circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688558A (en) * | 2020-12-16 | 2021-04-20 | 维沃移动通信有限公司 | Voltage regulation method, voltage regulation circuit, electronic device, and readable storage medium |
| CN112688558B (en) * | 2020-12-16 | 2022-04-05 | 维沃移动通信有限公司 | Voltage regulation method, voltage regulation circuit, electronic device, and readable storage medium |
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Application publication date: 20181113 |