CN102437736A - Voltage output adjustment method and system of linear power supply chip as well as chip - Google Patents

Voltage output adjustment method and system of linear power supply chip as well as chip Download PDF

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Publication number
CN102437736A
CN102437736A CN2010105002946A CN201010500294A CN102437736A CN 102437736 A CN102437736 A CN 102437736A CN 2010105002946 A CN2010105002946 A CN 2010105002946A CN 201010500294 A CN201010500294 A CN 201010500294A CN 102437736 A CN102437736 A CN 102437736A
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China
Prior art keywords
grade
power supply
linear power
load information
transistor
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CN2010105002946A
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罗红磊
肖璐
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Beijing BOE Optoelectronics Technology Co Ltd
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Beijing BOE Optoelectronics Technology Co Ltd
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Priority to CN2010105002946A priority Critical patent/CN102437736A/en
Publication of CN102437736A publication Critical patent/CN102437736A/en
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Abstract

The embodiment of the invention provides a voltage output adjustment method and system of a linear power supply chip as well as a chip and relates to the field of electrons, and the method, the system and the chip can be used for solving the problem of poor precision in a simulated compensation control circuit in the prior art so as to enhance the stability of the voltage output of the linear power supply chip. The method for solving the problem comprises the following steps of: obtaining load grade information of a power voltage according to a transmitted data signal; and transmitting the load grade information to the linear power supply chip so that the linear power supply chip conveniently controls the compensation circuit to regulate the output voltage according to the load grade information. The embodiment of the invention is used for regulating the output voltage of a linear power supply.

Description

Linear power supply chip voltage output adjusting method, chip and system
Technical field
The present invention relates to electronic applications, relate in particular to a kind of linear power supply chip voltage output adjusting method, chip and system.
Background technology
In existing DC/DC (DC-DC) power supply, because that LDO (Low Dropout, low pressure difference linear voltage regulator) has a peripheral components is less, circuit structure is simple, and the advantage that price is relatively cheap is so be widely used in the consumer electronics industry.
Usually, LDO is by input power supply (V IN), MOS (Metal Oxide Semiconductor, Metal-oxide-semicondutor), operational amplifier (Operating Amplifier, OP AMP), out-put supply (V OUT) wait several parts to constitute.When load increases, output voltage (V OUT) because output capacitance discharge and current potential descends, after the divider resistance induction, the pressure reduction of feedback voltage and band gap reference voltage increases, amplify certain multiple through error amplifier after, make the MOS conducting deepen, with the compensating load increase need energy.Otherwise when load reduced, then MOS conducting degree alleviated.
As shown in Figure 1, add an electric capacity between the G of the transmission transistor of the LDO that is everlasting in the existing design and the D, be called miller capacitance.Its major function is the conducting speed at time domain adjusted metal-oxide-semiconductor, and the zero limit that increases in the Bode diagram on the frequency domain is right, improves the phase margin of loop, improves the stability of power supply.
But in fact along with the variation of load step size and frequency speed, and because the consistency of Miller appearance value, make the stability degradation of loop.Phenomenon is that on time domain, to show as dynamic ripple value excessive, and it is too small to show as phase margin on the frequency, easily by noise jamming, produces vibration.
Be directed to this; As shown in Figure 2; Prior art mainly is through increasing compensating network---the miller-compensated electric capacity of a series of and series connection; And the transistor of a series of control miller capacitances and series connection, realizing variation along with load, the size of controlling the Muller building-out capacitor dynamically is to regulate the voltage of output.
In Fig. 2, voltage regulator circuit comprises output transmission transistor 10, mirrored transistor 45, compensating network 50 and error amplifier 40.Import the input terminal V of unregulated direct current INBe connected to the source electrode of output transmission transistor 10 and the source electrode of mirrored transistor 45.With the lead-out terminal V of output through the direct current of adjusting OUTThe drain electrode of the output transmission transistor 10 that couples provides output current Io.The grid of mirrored transistor 45 couples with the grid of output transmission transistor 10 each other.
The drain electrode generation of mirrored transistor 45 and output current I OProportional image current I MError amplifier 40 provides control voltage V CTLThe control voltage V that provides with the drain electrode of bias transistor 60 GOperate the grid of output transmission transistor 10.Reference voltage V REFBe supplied to the negative input of error amplifier 40.When output transmission transistor 10 is connected, input terminal V INThe voltage at place is from input terminal V INBe transferred to lead-out terminal V OUTResistor 31 is coupled in series in lead-out terminal V with resistor 32 OUTAnd between the reference ground level.Dividing potential drop node FB is between resistor 31 and resistor 32.The feedback voltage V at dividing potential drop node FB place FBBe supplied to the positive input of error amplifier 40.Produce and image current I from programmable current source 70 MProportional first image current I M1In response to the first image current I M1, based on the impedance of first mirrored transistor, 55 decision compensating networks 50.Programmable current source 71 produces and image current I MProportional second image current I M2In response to the second image current I M2, confirm the impedance of bias transistor 60 based on second mirrored transistor 65.
The grid that compensating network 50 is coupled in output transmission transistor 10 with drain between with compensation feedback loop.Compensating network 50 comprises first, and it has be one another in series first capacitor 80 that couples and the first transistor 90.The second portion of compensating network 50 is coupled in parallel to the first transistor 90, and this second portion comprises second capacitor 81 and transistor seconds 91 that is one another in series and couples.Compensating network 50 also comprises distribution network 52, and it has a plurality of electric capacity and the transistor that is connected in parallel with transistor seconds 91, and first capacitor 80 is coupled between the drain electrode of grid and the first transistor 90 of output transmission transistor 10.The source electrode of transistor 90 is couple to the drain electrode of output transmission transistor 10.Transistorized source electrode in first mirrored transistor 55, the first transistor 90, transistor seconds 91 and the distribution network 52 is couple to lead-out terminal V OUTThe transistor in the first transistor 90, transistor seconds 91, the distribution network 52 and the grid of first mirrored transistor 55 link together.Therefore, the transistorized impedance in the distribution network 52 is related with the impedance phase of first mirrored transistor 55 with the impedance of the first transistor 90 and transistor seconds 91.
The grid of first mirrored transistor 55 and the drain electrode formation current mirror that is coupled to each other.The drain electrode of first mirrored transistor 55 is couple to programmable current source 70.Therefore, the group hole and output current I of transistorized impedance in the distribution network 52 and the first transistor 90 and transistor seconds 91 OBe inversely proportional to.The drain electrode of bias transistor 60 is couple to the grid of output transmission transistor 10.The source electrode of the source electrode of bias transistor 60 and second mirrored transistor 65 is couple to the output of error amplifier 40.The drain electrode of the grid of the grid of bias transistor 60, second mirrored transistor 65 and second mirrored transistor 65 is couple to programmable current source 71.Therefore, the impedance of bias transistor 60 and output current I OBe inversely proportional to.
Along output, bias transistor 60, compensating network 50, output transmission transistor 10, lead-out terminal V from error amplifier 40 OUTAnd transistor 31,32 is to the path formation feedback loop of the positive input of error amplifier 40.
But the inventor finds that the module in the prior art compensating network 50 all is analog modules, and its accuracy has deviation, thereby influences the accuracy of miller-compensated control circuit, causes the instability of LDO output.
Summary of the invention
Embodiments of the invention provide a kind of linear power supply chip voltage output adjusting method, chip and system, have solved the not good problem of simulating in the prior art of compensation control circuit precision, have strengthened the stability of linear power supply chip voltage output.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of linear power supply chip voltage output adjusting method comprises:
Obtain the grade of load information of supply voltage according to data signals transmitted;
Said grade of load message transmission is arrived the linear power supply chip, so that said linear power supply chip is regulated output voltage according to said grade of load information Control compensating circuit.
Embodiments of the invention also provide a kind of linear power supply chip voltage output adjusting method, comprising:
Receive the grade of load information that control chip sends;
Regulate output voltage according to said grade of load information Control compensating circuit.
Embodiments of the invention also provide a kind of control chip, comprising:
The load acquisition module is used for obtaining according to data signals transmitted the grade of load information of supply voltage;
Sending module is used for said grade of load information is sent to the linear power supply chip.
Embodiments of the invention also provide a kind of linear power supply chip, comprising:
Receiver module is used to receive the grade of load information of sending from control chip;
Control module is used for the said grade of load information Control compensating circuit module that receives according to said receiver module;
The compensating circuit module is used for the regulating and controlling output voltage according to said control module.
Embodiments of the invention also provide a kind of linear power supply chip voltage output regulating system, comprising:
Control chip is used for obtaining according to data signals transmitted the grade of load information of supply voltage; And said grade of load information sent to the linear power supply chip;
The linear power supply chip is used to receive the said grade of load information that said linear power supply chip sends, and regulates output voltage according to said grade of load information Control compensating circuit.
The embodiment of the invention provides a kind of linear power supply chip voltage output adjusting method, chip and system, and control chip obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural circuit sketch map of LDO of the prior art;
Fig. 2 is the structural circuit sketch map of another LDO of the prior art;
The structured flowchart of the linear power supply chip voltage output adjusting method that Fig. 3 provides for the embodiment of the invention;
Fig. 4 executes the structured flowchart of the linear power supply chip voltage output adjusting method that example provides for real another of the present invention
The structural circuit sketch map of the LDO that Fig. 5 provides for the embodiment of the invention;
The structural circuit sketch map of the LDO that Fig. 6 provides for another embodiment of the present invention;
The structured flowchart of the control chip that Fig. 7 provides for the embodiment of the invention;
Fig. 8 provides the structured flowchart of another control chip of control for the embodiment of the invention;
The structured flowchart of the linear power supply chip that Fig. 9 provides for the embodiment of the invention;
The structured flowchart of another linear power supply chip that Figure 10 provides for the embodiment of the invention;
The linear power supply chip voltage that Figure 11 provides for the embodiment of the invention is exported the structured flowchart of regulating system.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The linear power supply chip voltage output adjusting method that the embodiment of the invention provides, as shown in Figure 3, this method step comprises:
S301, obtain the grade of load information of supply voltage according to data signals transmitted.
The executive agent of step S301 can be TCON (Timing Controller, a time schedule controller).
Concrete, TCON can be according to the transition grade or the greyscale level of the data in the transmission, calculates the grade of load information of the supply voltage that module such as TCON interface data signal need consume.And further, TCON carries out digital coding with this grade of load information, changes into the string number coding.
In addition, because present many panels have added black plug, (Over Drive OD) waits the data analysis module step, therefore, can the implementation of step S301 be added in the data analysis module steps such as black plug, OD, can save resource like this in blasting.
S302, with this grade of load message transmission to the linear power supply chip, so that the linear power supply chip is regulated output voltage according to this grade of load information Control compensating circuit.
Concrete, TCON can give the linear power supply chip through the grade of load message transmission of I2C interface after with digital coding, so that the linear power supply chip is regulated output voltage according to this grade of load information Control compensating circuit.
In addition, grade of load information from TCON to the transmission course of linear power supply chip, can be and control signal synchronous transmission such as STV/VSYNC, so same saving resource.
The linear power supply chip voltage output adjusting method that the embodiment of the invention provides, control chip obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
Need to prove that the grade of load calculates and in TCON, to accomplish in the present embodiment, but present embodiment is not limited to this,, also can accomplishes as among the image cropping tool SCALAR etc. at other chip.But if use SCALAR, need corresponding increase connector pin, realize the communication between plates of SCALAR plate and TCON control board.
In addition, the grade of load makes through I2C interface transmission in the present embodiment, but present embodiment is not limited to this, at other interface, also can like SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) etc.
The linear power supply chip voltage output adjusting method that another embodiment of the present invention provides, as shown in Figure 4, this method step comprises:
The grade of load information that S401, reception control chip send.
The executive agent of step S401 can be LDO.Same as the previously described embodiments, can receive the grade of load information that obtains in advance through I2C interface or SPI interface, and this grade of load information quilt is through the digitized processing mistake from TCON.
S402, regulate output voltage according to this grade of load information Control compensating circuit.
In the present embodiment, compensating circuit has by transistor and electric capacity and constitutes, and the switching through oxide-semiconductor control transistors can be to realize the series-parallel various combination of electric capacity.
Fig. 5 is the basic structure circuit diagram of embodiment of the invention LDO.This LDO comprises error amplifier 501, compensating circuit 510, control module 511, output transmission transistor 502 and resistance 503,504.
Import the input terminal V of unregulated direct current INBe connected the lead-out terminal V of the direct current after output is regulated with the source electrode of output transmission transistor 502 OUTBe connected with the drain electrode of output transmission transistor 502, the output of error amplifier 501 is connected with the grid of output transmission transistor 502.The sub-V of supply output terminal OUTThe current delivery of output is given load, this load one end and lead-out terminal V OUTConnect other end ground connection.
When output transmission transistor 502 is connected, input terminal V INThe voltage at place will be from input terminal V INBe transferred to lead-out terminal V OUTResistance 503,504 is connected on lead-out terminal V OUTAnd between the reference ground level, a dividing potential drop node FB is between resistance 503 and 504, and the feedback voltage at dividing potential drop node FB place is supplied to the positive input of error amplifier 501, reference voltage V REFThe negative input of put-into error amplifier 501.
The grid that compensating circuit 510 is connected output transmission transistor 502 with drain between with compensation feedback loop.Compensating circuit 510 comprises the electric capacity and the transistors of many group series connection, and constitute like first electric capacity 505 and the first transistor 506 of series connection first group, second group of constituting of second electric capacity 507 of series connection and transistor seconds 508.In first group, an end of first electric capacity 505 is connected with the grid of output transmission transistor 502, and the other end is connected with the source electrode of the first transistor 506, the drain electrode of the first transistor 506 and lead-out terminal V OUTConnect, the grid of the first transistor 506 is connected with control module 511.Second group of the first transistor 506 with first group is parallelly connected; Promptly an end of second group second electric capacity 507 is connected with the source electrode of first group the first transistor 506; The other end of second electric capacity 507 is connected with the source electrode of transistor seconds 508; The drain electrode of transistor seconds 508 is connected with the drain electrode of the first transistor 506, and is connected to lead-out terminal V OUT, the grid of transistor seconds 508 is connected with control module 511.Also all like this between other groups.
Concrete; After receiving the digital coding that comprises grade of load information as LDO; With this grade of load information translation is transistor controls signal D1, D2, D3 ... After be sent to control module 511, control module 511 is according to this transistor controls signal D1, D2, D3 ... The transistor 506,508 of control compensation circuit 510 ... Switching, change a plurality of electric capacity 505,507 of compensating circuit 510 ... The connection in series-parallel state; To reach the appearance value size that changes miller-compensated electric capacity, realize the adjusting of output voltage.
In addition, the precision of control compensation circuit adjustment output voltage is directly proportional with the digital coding figure place of grade of load information, i.e. digital coding figure place is more many, and the number of controllable transistor and electric capacity is also just many more, thereby the control precision that is realized is also just accurate more.Simultaneously, the appearance value of each electric capacity in the compensating circuit both can equate, also can not wait.
Have again, as shown in Figure 6, can also add a transistor controls resistance 512, so better the zero limit of regulation loop.
The linear power supply chip voltage output adjusting method that the embodiment of the invention provides, control chip obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
In addition, because the compensating circuit in this enforcement belongs to digital circuit, receive the influence of temperature, humidity and process conditions less.Effectively improve the process complexity and the environmental difference property of load-sensing unit in the prior art, can effectively prevent the too small output concussion that causes of loop phase nargin.
A kind of control chip 70 that the embodiment of the invention provides, as shown in Figure 7, comprising:
Load acquisition module 701 is used for obtaining according to data signals transmitted the grade of load information of supply voltage.
Sending module 702 is used for this grade of load information is sent to the linear power supply chip.
Further, as shown in Figure 8, this control chip 70 also comprises:
Digital coding module 703, the grade of load information that is used for load acquisition module 701 is obtained is carried out digital coding, obtains the grade of load information after the digital coding.
Sending module 702, the grade of load information after the digital coding that is used for digital coding module 703 is obtained is sent to the linear power supply chip.
Control chip 70 comprises time schedule controller TCON or image cropping tool SCALAR.And this control chip 70 is arranged in data analysis modules such as black plug, OD.
The control chip that the embodiment of the invention provides obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
The linear power supply chip 90 that the embodiment of the invention provides, as shown in Figure 9, comprising:
Receiver module 901 is used to receive the grade of load information of sending from control chip.
Control module 902 is used for the grade of load information Control compensating circuit module 903 that receives according to receiver module 901.
Compensating circuit module 903 is used for the regulating and controlling output voltage according to control module 902.
The basic circuit framework of linear power supply chip comprises like Fig. 5, shown in 6:
Input terminal V IN, be used to import unregulated direct current;
Lead-out terminal V OUT, be used to export the direct current after the adjusting;
Output transmission transistor 502 is used for to lead-out terminal V INPower supply, the grid of output transmission transistor 502 is connected with the output of error amplifier 501, the source electrode and the input terminal V of output transmission transistor 502 INConnect the drain electrode and the lead-out terminal V of output transmission transistor 502 OUTConnect;
Error amplifier 501 is used to control the grid of exporting transmission transistor 502, and the positive input terminal of error amplifier 501 inserts the branch pressure voltage of the voltage at lead-out terminal place, and the negative input end of error amplifier 501 inserts reference voltage;
Compensating circuit module 510 is connected between the grid and drain electrode of output transmission transistor 502, further comprises: the electric capacity of at least one group of series connection (as 505,507 etc.) and transistor (as 506,508 etc.), and parallelly connected between the electric capacity of each group series connection and the transistor.
Wherein, electric capacity and transistor series are example with electric capacity 505 with transistor 506, for: the source electrode of transistor 506 is connected with electric capacity 505, and the grid of transistor 506 is connected with control module 511; The other end of first group electric capacity 505 is connected with the grid of output transmission transistor 502, and the drain electrode of first group transistor 506 is connected with lead-out terminal;
Parallel connection between each group is example with electric capacity 507 with transistor 508, for: the other end of electric capacity 507 is connected with the source electrode of last group transistor 506, and the drain electrode of transistor 508 is connected with the drain electrode of last group transistor 506.
Shown in figure 10, property power supply chip 90 also comprises:
Modular converter 904, the grade of load information translation that is used for receiver module 901 is received is the transistor controls signal.
Control module 902, the transistorized switching of the transistor controls signal controlling compensating circuit module 903 that is used for obtaining according to modular converter 904.
Transistor controls resistance 905 is used for the zero limit of regulation loop.
Linear power supply chip 90 can be LDO.
The linear power supply chip that the embodiment of the invention provides, control chip obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
The linear power supply chip voltage output regulating system that the embodiment of the invention provides, shown in figure 11, comprising:
Control chip 1101 is used for obtaining according to data signals transmitted the grade of load information of supply voltage; And grade of load information sent to linear power supply chip 1102.
Linear power supply chip 1102 is used to receive the grade of load information that linear power supply chip 1101 sends, and regulates output voltage according to this grade of load information Control compensating circuit.
In the present embodiment, control chip 1101 can be TCON or SCALAR; Linear power supply chip 1102 can be LDO; And control chip 1101 can be connected through I2C interface or SPI interface with linear power supply chip 1102.
The structure of control chip 1101 and linear power supply chip 1102 is same as the previously described embodiments, repeats no more at this.
Linear power supply chip voltage that the embodiment of the invention provides output regulating system, control chip obtains the grade of load information of supply voltage according to the data-signal in the transmission, and with this grade of load message transmission to the linear power supply chip; After the linear power supply chip receives, regulate output voltage according to this grade of load information Control compensating circuit.Thus; The linear power supply chip carries out voltage output control through the grade of load information Control compensating circuit that precomputes; Can effectively improve control accuracy; Avoid the not good problem of compensation control circuit precision simulated in the prior art, strengthened the stability of linear power supply chip voltage output.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.

Claims (17)

1. a linear power supply chip voltage output adjusting method is characterized in that, comprising:
Obtain the grade of load information of supply voltage according to data signals transmitted;
Said grade of load message transmission is arrived the linear power supply chip, so that said linear power supply chip is regulated output voltage according to said grade of load information Control compensating circuit.
2. method according to claim 1 is characterized in that, the said grade of load information that obtains supply voltage according to data signals transmitted comprises:
Calculate the grade of load information of the supply voltage that needs to consume according to the transition grade in the data or greyscale level.
3. method according to claim 1 and 2 is characterized in that, said grade of load message transmission is comprised to the linear power supply chip:
Said grade of load information is carried out being transferred to the linear power supply chip after the digital coding.
4. method according to claim 3 is characterized in that, through I2C interface or the SPI interface said grade of load message transmission after with digital coding to the linear power supply chip.
5. method according to claim 4 is characterized in that, said grade of load information after the digital coding and control signal synchronous transmission are to said linear power supply chip.
6. method according to claim 1 is characterized in that, the said step that obtains the grade of load information of supply voltage according to data signals transmitted is carried out in black plug or blasting data analysis step.
7. a linear power supply chip voltage output adjusting method is characterized in that, comprising:
Receive the grade of load information that control chip sends;
Regulate output voltage according to said grade of load information Control compensating circuit.
8. method according to claim 7 is characterized in that, saidly regulates output voltage according to said grade of load information Control compensating circuit and comprises:
With said grade of load information translation is the transistor controls signal, and according to the transistorized switching of the said compensating circuit of this transistor controls signal controlling, changes the connection in series-parallel state of a plurality of electric capacity of said compensating circuit, regulates output voltage.
9. according to claim 7 or 8 described methods, it is characterized in that the precision of control compensation circuit adjustment output voltage is directly proportional with the digital coding figure place of said grade of load information.
10. a control chip is characterized in that, comprising:
The load acquisition module is used for obtaining according to data signals transmitted the grade of load information of supply voltage;
Sending module is used for said grade of load information is sent to the linear power supply chip.
11. control chip according to claim 10 is characterized in that, said control chip also comprises:
Digital coding module is used for the said grade of load information that said load acquisition module obtains is carried out digital coding, obtains the grade of load information after the digital coding;
Said sending module, the grade of load information after the digital coding that is used for said digital coding module is obtained is sent to the linear power supply chip.
12., it is characterized in that said control chip comprises time schedule controller TCON, image cropping tool SCALAR according to claim 10 or 11 described control chips.
13. a linear power supply chip comprises the basic circuit framework, it is characterized in that, also comprises:
Receiver module is used to receive the grade of load information of sending from control chip;
Control module is used for the said grade of load information Control compensating circuit module that receives according to said receiver module;
The compensating circuit module is used for the regulating and controlling output voltage according to said control module.
14. linear power supply chip according to claim 13 is characterized in that,
Said basic circuit framework comprises:
Input terminal is used to import unregulated direct current;
Lead-out terminal is used to export the direct current after the adjusting;
The output transmission transistor; Be used for to said lead-out terminal power supply; The grid of said output transmission transistor is connected with the output of error amplifier, and the source electrode of said output transmission transistor is connected with said input terminal, and the drain electrode of said output transmission transistor is connected with said lead-out terminal;
Error amplifier is used to control the grid of said output transmission transistor, and the positive input terminal of said error amplifier inserts the branch pressure voltage of the voltage at said lead-out terminal place, and the negative input end of said error amplifier inserts reference voltage;
Said compensating circuit module is connected between the grid and drain electrode of said output transmission transistor, further comprises: the electric capacity and the transistor of at least one group of series connection, parallel connection between the electric capacity of each group series connection and the transistor; Wherein, electric capacity with transistor series is: transistorized source electrode is connected with electric capacity one end, and said transistorized grid is connected with said control module; The other end of first group electric capacity is connected with the grid of said output transmission transistor, and first group transistor drain is connected with said lead-out terminal; Parallel connection is between each group: except that said first group, the other end of the electric capacity of other groups is connected with last group transistorized source electrode, and the transistor drain of other groups is connected with last group transistor drain.
15. linear power supply chip according to claim 13 is characterized in that, said linear power supply chip also comprises:
Modular converter, the said grade of load information translation that is used for said receiver module is received is the transistor controls signal;
Said control module, the transistorized switching of the said compensating circuit module of said transistor controls signal controlling that is used for obtaining according to said modular converter.
16., it is characterized in that said linear power supply chip also comprises according to the arbitrary described linear power supply chip of claim 13 to 15:
Transistor controls resistance is used for the zero limit of regulation loop.
17. a linear power supply chip voltage output regulating system is characterized in that, comprising:
Control chip is used for obtaining according to data signals transmitted the grade of load information of supply voltage; And said grade of load information sent to the linear power supply chip;
The linear power supply chip is used to receive the said grade of load information that said linear power supply chip sends, and regulates output voltage according to said grade of load information Control compensating circuit.
CN2010105002946A 2010-09-29 2010-09-29 Voltage output adjustment method and system of linear power supply chip as well as chip Pending CN102437736A (en)

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Cited By (8)

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CN107800282A (en) * 2017-10-31 2018-03-13 广东欧珀移动通信有限公司 The control method and electric power system of electric power system
CN109951069A (en) * 2019-04-10 2019-06-28 苏州浪潮智能科技有限公司 A kind of voltage compensating method and device of reduction voltage circuit
CN110534066A (en) * 2018-05-24 2019-12-03 格科微电子(上海)有限公司 The power control method of LCD driving chip
CN110968145A (en) * 2018-09-28 2020-04-07 华邦电子股份有限公司 Low-voltage-drop voltage stabilizing circuit and voltage stabilizing method thereof
CN111477194A (en) * 2020-05-27 2020-07-31 京东方科技集团股份有限公司 Common voltage output circuit, display device and common voltage compensation method
CN112072918A (en) * 2020-08-24 2020-12-11 广州金升阳科技有限公司 Compensation control circuit for detecting output voltage and implementation method thereof

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CN103544129A (en) * 2012-07-11 2014-01-29 英飞凌科技股份有限公司 SPI interface and method for serial communication via an SPI interface
US9418037B2 (en) 2012-07-11 2016-08-16 Infineon Technologies Ag SPI interface and method for serial communication via an SPI interface having an SPI protocol handler for evaluating signal transitions of SPI signals
CN103544129B (en) * 2012-07-11 2016-12-07 英飞凌科技股份有限公司 SPI interface and the serial communication method via SPI interface
CN105850021A (en) * 2013-12-26 2016-08-10 戴乐格半导体公司 Current meter for load modulation communication receiver architecture
CN105850021B (en) * 2013-12-26 2018-11-13 戴乐格半导体公司 Ammeter for loading modulation communication receiver architecture
CN107800282A (en) * 2017-10-31 2018-03-13 广东欧珀移动通信有限公司 The control method and electric power system of electric power system
CN110534066A (en) * 2018-05-24 2019-12-03 格科微电子(上海)有限公司 The power control method of LCD driving chip
CN110968145A (en) * 2018-09-28 2020-04-07 华邦电子股份有限公司 Low-voltage-drop voltage stabilizing circuit and voltage stabilizing method thereof
CN110968145B (en) * 2018-09-28 2021-09-14 华邦电子股份有限公司 Low-voltage-drop voltage stabilizing circuit and voltage stabilizing method thereof
CN109951069A (en) * 2019-04-10 2019-06-28 苏州浪潮智能科技有限公司 A kind of voltage compensating method and device of reduction voltage circuit
CN111477194A (en) * 2020-05-27 2020-07-31 京东方科技集团股份有限公司 Common voltage output circuit, display device and common voltage compensation method
CN112072918A (en) * 2020-08-24 2020-12-11 广州金升阳科技有限公司 Compensation control circuit for detecting output voltage and implementation method thereof

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Application publication date: 20120502