CN104635829B - Power-switching circuit and voltage conversion method - Google Patents
Power-switching circuit and voltage conversion method Download PDFInfo
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- CN104635829B CN104635829B CN201410849058.3A CN201410849058A CN104635829B CN 104635829 B CN104635829 B CN 104635829B CN 201410849058 A CN201410849058 A CN 201410849058A CN 104635829 B CN104635829 B CN 104635829B
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Abstract
The invention mainly relates to power conversion systems, exactly, it is first to provide a calibration circuit between band-gap reference source circuit and multiple voltage converting branch to be calibrated, then the calibration circuit for recycling multiple voltage converting branch respectively to come with individually calibrates semifixed resistor, to save semifixed resistor quantity.
Description
Technical field
The invention mainly relates to power conversion systems, exactly, are converted in band-gap reference source circuit and multiple voltages
It first provides a calibration circuit between branch to be calibrated, the calibration electricity for then recycling multiple voltage converting branch respectively to come with
Semifixed resistor is individually calibrated on road, to save semifixed resistor quantity.
Background technique
In conventional power conversion system, the AC-input voltage V that power grid can be provided using AC/DC changeover switchACTurn
Change desired DC voltage V intoDC, then again by dc voltage changer to voltage VDCAfter modulation, it is micro- to export final tool
The DC output voltage V of small rippleOUT, this is the routine techniques that existing AC-DC conversion system uses.Problems faced is,
Often there are a plurality of sub- subcircuits, every strip branch is required to provided by benchmark band gap source circuit in one electronic device
Reference voltage or reference voltage carry out individual DC-DC conversion, therefore, when every branch needs to calibrate final output voltage
Just need to provide an independent calibration circuit for the branch, it is excessive to will cause total calibrating resistance in this way, especially if benefit
Total resistance value is adjusted with whether the binary system Bit data of memory storage control calibrating resistance is short-circuited, then excessive calibration
Resistance also means that large-scale Bit data, this original intention for saving cost and the reduction bit error rate with us runs in the opposite direction, therefore
It is necessary to provide a kind of accurate power-switching circuit and corresponding conversion methods.
Summary of the invention
In one embodiment of the invention, a kind of power-switching circuit is provided, comprising: a primary calibration unit,
The first reference voltage provided by band gap reference is provided and it is calibrated；One or more voltage converting branch, respectively
Voltage modulated is implemented to the voltage that primary calibration unit provides and one or more output voltages are correspondingly provided whereby；And it is every
A voltage converting branch all includes at least the secondary calibration unit for having the second divider, and the second divider is to belonging to it
The output voltage of voltage converting branch transmission is divided to generate feedback voltage, and secondary calibration unit is for having it
The second divider calibrated to avoid feedback voltage generate error.
Above-mentioned power-switching circuit, primary calibration unit include first divider, be can be changed with total resistance value
Trimming circuit and with the concatenated one or more resistors of the trimming circuit；The voltage of primary calibration unit output is set by the
One divider is equal to first reference voltage according to partial pressure caused by scheduled intrinsic standoff ratio.
Above-mentioned power-switching circuit, primary calibration unit also include one and the total resistance value of trimming circuit are adjusted
Control module, to ensure that the voltage of primary calibration unit output is in a first target voltage value level；And finely tune electricity
Road includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch, by electronic cutting
The total resistance value that trimming circuit is adjusted whether connection of pass.
Above-mentioned power-switching circuit, the voltage difference comparator that control module has are electric by its received first object of institute
Pressure value is compared and generates voltage difference with the voltage of primary calibration unit output, and the coding unit that control module has is according to this
Voltage difference generates corresponding binary element and is written to the register of control module as control signal, each electronic switch
Control terminal all correspond to by one control signal control；Judge that electronic switch is switched in trimming circuit by the voltage difference
Or the quantity disconnected, until the voltage of primary calibration unit output has first target voltage value level.
Above-mentioned power-switching circuit, the second divider include the variable trimming circuit of total resistance value and with the trimming circuit
Concatenated one or more resistor；Secondary calibration unit passes through the voltage that will be applied on its divider with scheduled point
Pressure ratio on second divider to generate a partial pressure.
Above-mentioned power-switching circuit, secondary calibration unit also include one and the total resistance value of trimming circuit are adjusted
Control module, with ensure secondary calibration unit provide partial pressure be in a second target threshold voltage level；And fine tuning
Circuit includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch, by electronics
The total resistance value that trimming circuit is adjusted whether connection of switch.
Above-mentioned power-switching circuit, the voltage difference comparator that control module has are electric by its received second target of institute
Pressure value is compared with the partial pressure that the second divider provides and generates voltage difference, and the coding unit that control module has is according to the electricity
Pressure difference, which generates corresponding binary element and is written to the register of control module, is used as control signal, each electronic switch
Control terminal all corresponds to the control that signal is controlled by one；By the voltage difference judge in trimming circuit electronic switch be switched on or
The quantity of disconnection, until the partial pressure that divider provides is in the second target voltage values level.
In another optional embodiment provided by the invention, a kind of method of voltage conversion is further disclosed, it is main to wrap
It includes following steps: a primary calibration unit for receiving the first reference voltage provided by band gap reference being provided, is joined to first
Voltage is examined to be calibrated；Using one or more voltage converting branch, electricity is implemented to the voltage that primary calibration unit provides respectively
Pressure modulation simultaneously correspondingly provides one or more output voltages whereby；At least providing in each voltage converting branch includes one
A secondary calibration unit for having the second divider, the output using the second divider to the voltage converting branch transmission belonging to it
Voltage is divided to generate feedback voltage, and using the second divider that secondary calibration unit has it calibrated with
Feedback voltage is avoided to generate error.
The above method, primary calibration unit include first divider, with total resistance value can be changed trimming circuit and
With the concatenated one or more resistors of the trimming circuit；The voltage that primary calibration unit output is arranged is pressed by the first divider
It is equal to first reference voltage according to partial pressure caused by scheduled intrinsic standoff ratio.
The above method, primary calibration unit also include the control mould that the total resistance value of trimming circuit is adjusted
Block, to ensure that the voltage of primary calibration unit output is in a first target voltage value level；And trimming circuit includes one
A or multiple semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch, by the connection of electronic switch
Whether adjust the total resistance value of trimming circuit.
The above method, the voltage difference comparator that control module has is by its received first target voltage value of institute and primary
The voltage of calibration unit output is compared and generates voltage difference, and the coding unit that control module has is generated according to the voltage difference
Corresponding binary element is simultaneously written to the register of control module as control signal, the control terminal of each electronic switch
The corresponding control that signal is controlled by one；The number that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference
Amount, until the voltage of primary calibration unit output has first target voltage value level.
The above method, the second divider include the variable trimming circuit of total resistance value and concatenated one with the trimming circuit
Or multiple resistors；Secondary calibration unit passes through the voltage that will be applied on its divider with scheduled intrinsic standoff ratio at this
A partial pressure is generated on second divider.
The above method, secondary calibration unit also include the control mould that the total resistance value of trimming circuit is adjusted
Block, to ensure that the partial pressure of secondary calibration unit offer is in the level of second target voltage；And trimming circuit includes one
A or multiple semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch, by the connection of electronic switch
Whether adjust the total resistance value of trimming circuit.
The above method, the voltage difference comparator that control module has is by its received second target voltage values of institute and second
The partial pressure that divider provides is compared and generates voltage difference, and the coding unit that control module has generates phase according to the voltage difference
The register of the binary element and write-in to control module answered is used as control signal, and the control terminal of each electronic switch is right
The control of signal should be controlled by one；The number that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference
Amount, until the partial pressure that divider provides has the second target voltage values level.
In another embodiment of the present invention, a kind of power-switching circuit is further disclosed, comprising: one has first point
First calibration unit of depressor or primary calibration unit receive the first reference voltage provided by band gap reference and utilize the
One divider calibrates the first reference voltage；One or more voltage converting branch respectively provide the first calibration unit
Voltage implement voltage modulated and it is corresponding whereby one or more output voltages are provided, each voltage converting branch at least wraps
Second calibration unit or secondary calibration unit for having the second divider is included, the second divider turns the voltage belonging to it
The output voltage for changing branch transmission is divided to generate feedback voltage, and the second calibration unit is used for have to it second
Divider, which is calibrated, generates error to avoid feedback voltage；Any one voltage converting branch, is set in and does not enable the first school
Directly it is to original semifixed resistor initial number in the second divider in the state of the implementation modulation of the first reference voltage when quasi- unit
Sum1 is no more than Sum1 when setting the semifixed resistor total quantity having in the second divider when enabling the first calibration unit.?
In an optional embodiment, if the semifixed resistor having in the first divider can be set when enabling the first calibration unit
Quantity is Sum2, then the semifixed resistor total quantity having in the second divider when enabling the first calibration unit subtracts no more than Sum1
Remove Sum2.
Detailed description of the invention
Read it is described further below and referring to the following drawings after, feature and advantage of the invention will be evident:
Fig. 1 illustrates the basic structure of power-switching circuit.
Fig. 2 is the illustrative circuitry of primary calibration unit.
Fig. 3 is exemplary to illustrate a kind of circuit of optional Buck type voltage converting branch.
Fig. 4 is the example of secondary calibration unit in voltage converting branch.
Specific embodiment
Referring to Fig. 1,101 circuit of the band gap reference spy unrelated with input voltage and temperature according to the band gap voltage of silicon materials
Property, utilize the base emitter voltage V of bipolar transistorBENegative temperature coefficient, with Δ VBEPositive temperature coefficient cancel out each other,
Low Drift Temperature, high-precision reference voltage are provided to realize.It is ripe by those skilled in the art institute in view of band gap reference 101
Know, therefore it will not go into details, band gap reference 101 provides reference voltage or the first reference voltage VREF1, there are more in traditional
In the electronic device on road, because the rating requirements value of voltage value is slightly different, each branch can be referred to individually to first
Voltage VREF1Voltage modulated is carried out, such as realizes that conventional decompression Buck or boosting Boost or buck Buck-Boost etc. are adjusted
System.In the present invention, exemplary that offer DC output voltage V in power-switching circuit is providedOUT1First voltage conversion
Branch 103-1, output voltage V is providedOUT2Second voltage converting branch 103-2, provide output voltage VOUT3Tertiary voltage turn
Change branch 103-3 ... and provide output voltage VOUTNN voltage converting branch 103-N (natural number that N is positive) etc.,
Typically application such as kernel decompression converting branch, arm processor decompression converting branch, MEMO is stored these voltage converting branch
Device is depressured branch, low-pressure linear adjuster LDO branch or WCDMA power amplifier branch etc..Due to various causes, for example technique
The external factors such as deviation, the voltage such as output voltage V that each branch providesOUTNIt not coincide with desired voltage values always, therefore
Voltage converting branch 103-1,103-2 that this etc. is arranged in parallel, 103-3 ... 103-N is each configured with secondary calibration list toward contact
First 104-1,104-2,104-3 ... 104-N etc., to calibrate respective output voltage.
Compared with the voltage modulated method of traditional multiple branch circuit, do not provide band gap reference 101 in the present invention first is joined
Examine voltage VREF1It is delivered directly to first voltage converting branch 103-1, second voltage converting branch 103-2, tertiary voltage conversion
Branch 103-3 etc., it is alternative, first by the first reference voltage VREF1After the calibration of primary calibration unit 102, then will be primary
The calibration voltage V that calibration unit 102 exportsPBe supplied to first voltage converting branch 103-1, second voltage converting branch 103-2,
Tertiary voltage converting branch 103-3 etc..Statement in advance, Fig. 2 is only an exemplary embodiment for explaining the present invention, and
Limitation of the invention is not constituted.Referring to fig. 2, first reference voltage V is inputted in the negative input end of error amplifier 105REF1, accidentally
The output end of poor amplifier 105 is connected to the control terminal such as grid of a driving switch 106, for example the driving switch of pmos type
106 general opposite band gap references 101 have bigger driving capability.One of driving switch 106 and primary calibration unit 102
Divider 220 is serially connected in supply voltage VDDBetween ground terminal, specifically, in a first end such as source of driving switch 106
The supply voltage V of pole input direct-currentDD, and at node 180 of its opposite second end such as drain electrode between ground terminal GND
It is in series with resistor Ra1 and trimming circuit 107 and resistor Ra2, wherein resistor Ra1, Ra2 and trimming circuit 107, which are constituted, divides
Depressor 220, the positive input terminal of error amplifier 105 are connected at the node 181 of the one end resistor Ra2, and resistor Ra2's is another
End ground connection.It is noted that the connection of diagram is merely possible to used in explaination, supply voltage V is utilizedDDWith the first reference voltage
VREF1Generate the calibration voltage V that primary calibration unit 102 exportsPAlso there are many deformations not illustrated.
School is exported at the common node 180 that primary calibration unit 102 interconnects between resistor Ra1 and driving switch 106
Voltage V after standardP, wherein voltage VPWith resistor Ra1, trimming circuit 107, resistor Ra2 this three the sum of total resistance value
Ratio is equal to the first reference voltage VREF1With the ratio of resistor Ra2 resistance value.In other words, it may also be said to voltage VPPass through fine tuning
Circuit 107 and the divider of resistor Ra1, resistor Ra2 building by scheduled intrinsic standoff ratio at the node 181 caused by point
Pressure value is equal to the first reference voltage VREF1, the intrinsic standoff ratio be exactly in fact resistor Ra2 resistance value divided by resistor Ra1, Ra2,
The total resistance value of 107 this three of trimming circuit.Voltage VPThe key factor that can be calibrated is to finely tune in primary calibration unit 102
The total resistance value of circuit 107 is adjustable, and trimming circuit 107 includes the semifixed resistor RP of multiple series connections1、RP2、RP3、
RP4、……RPK, and these semifixed resistors respectively accordingly are all arranged to be parallel with the electronic switch SP of three ports1、SP2、
SP3、RP4、……SPK.Notice that the three-port electronic switch that the context of the invention refers to is with control terminal and a first port
And a second port, the logic level of control terminal determine that the connection of the first, second port is also off.Such as semifixed resistor
RP1Two endpoints correspondence be connected respectively to electronic switch SP1First port and second port, semifixed resistor RPKBoth ends point
It is not connected to electronic switch SPKThe first port and second port of (K is greater than the natural number equal to 1).If some is specified
Electronic switch SPKControl terminal receive logic high be disconnected then semifixed resistor RPKEffectively, vice versa, i.e. electronic switch
SPKReception low level and be switched on then in parallel semifixed resistor RP therewithKIt can be short-circuited, thus in this way, by electronics
Switch SP1、SP2、……SPKAdjust the total resistance value of trimming circuit 107 whether connection.
Primary calibration unit 102 also includes a control module 108 that the total resistance value of trimming circuit 107 is adjusted
Or referred to as programming module, to voltage VPPrecise fine-adjustment amendment is carried out, to ensure voltage VPWith substantially with first target voltage value
VTARIt is equal.The electricity that one or more voltage difference comparators 111 that control module 108 has provide primary calibration unit 102
Press VPWith voltage difference comparator 111 from external received first target voltage value VTARIt is compared and generates the anti-of voltage difference
Feedback, instruction should increase or reduce voltage VP, in response to the feedback, have a coding unit 112 of control module 108
Corresponding binary element is generated according to the voltage difference, is received by the burning unit 113 that control module 108 has this series of
Binary code metadata, and be written to control module 108 register 114 as control electronic switch SP1、SP2、……SPK
The control signal TRIMP whether connected1、TRIMP2、……TRIMPK, each control signal TRIMPKCorrespondence is transmitted to correspondence
An electronic switch SPKControl terminal.It should be appreciated that in addition to the embodiment is any ADC (Analog to digital
Converter) voltage difference is converted to Bit numerical digit and is suitable for the present invention by converter.By voltage VPWith first target voltage value
VTARBetween voltage difference judge electronic switch is switched on or disconnects in trimming circuit 107 quantity, until voltage VPIn first
Target voltage values VTARLevel.It is noted that trimming circuit 107 and control module 108 are only to illustrate model in Fig. 2
The schematic diagram of change, there is no displayings, such as the control of the known register of those skilled in the art for some contents that can be dispensed
Signal data need in certain embodiments in advance by recycled after decoder for decoding one group of decoded signal come effectively connect or
The corresponding switch of shutdown.
Referring to Fig. 3 and Fig. 4, secondary calibration unit 104-1 is carried out by taking a voltage-dropping type voltage converting branch 103-1 as an example
Exemplary explaination, secondary calibration unit 104-1 have a divider 230 being connected between node 380 and ground terminal, and
Voltage converting branch 103-1 just provides output voltage V at node 380OUT1, divider 230 can be changed micro- including total resistance value
Adjust circuit 107' and including with trimming circuit 107' concatenated resistor Rb1, Rb2, in resistor Rb1 and trimming circuit
It is equipped with feedback node 480 between 107', and is connected with resistor Rb2 between trimming circuit 107' and ground terminal.Statement in advance, figure
4 be only an exemplary embodiment for explaining the present invention, does not constitute limitation of the invention.Voltage converting branch 103-
The 1 voltage V for needing to provide primary calibration unit 102PCarry out decompression modulation, high-end HS power switch QM1 and low side LS power
Switch QM2 is serially connected in voltage VPBetween ground terminal, the common node 280 and voltage interconnected between switch QM1 and switch QM2 turns
It changes between the output node 380 of branch 103-1 and is connected with an inductance L1, switch QM1 and switch QM2 are alternately opened, and defeated
An output capacitance C between egress 380 and ground terminalO1The upper output voltage V for generating smaller rippleOUT1.It, can as example
To carry out the working stage of voltage modulated in voltage converting branch 103-1, using a 122 driving switch QM1 of RS latch and
Switch QM2 is switched on or switched off, and notices that driver etc. is omitted, and is coupled by the clock signal clk that an oscillator 121 is sent
To the set end S of RS latch 122, and the output end of comparator 124 is coupled to the R of the reset of RS latch 122, and also
The positive input terminal of comparator 124 inputs the sawtooth wave V sent by oscillator 121SLOThe current sensing signal V compensatedSEN,
Middle current sensing signal VSENThe on state stage in switch QM1, electric current induction amplifier 125 detect with voltage value
The electric current for flowing through switch QM1 embodied.And the negative input end of comparator 124 is also connected to an error amplifier 123
Output end.Here the voltage converting branch 103-1 of simple narration modelling is for the ease of explaining and mentioning to error amplifier 123
For feedback voltage VFBDivider 230 carry out resistance calibration mechanism, but this does not imply that this present invention shall be limited only to this
Kind buck converter.
The normal work stage of voltage converting branch 103-1 is generated on divider 230 at a node 480 of partial pressure
A feedback voltage V can be generatedFB, and it is input to the inverting input terminal of error amplifier 123, in the same of error amplifier 123
Phase input terminal inputs a second reference voltage VREF2, substantially equivalent to the second target voltage values VTH, by the output knot of comparator 124
Fruit determines that the voltage converting branch 103-1 receives the voltage V that primary calibration unit 102 provides in each periodPDuty ratio.
If the Q output of RS latch 122 is coupled to the grid of switch QM1 and the inversion signal of Q output is coupled to switch QM2's
Grid, as switch QM1 conducting voltage VPJust it can be conveyed to inductance L1 in node 280, the voltage V if switch QM1 is closedPIt will not
Inductance L1 is conveyed in node 280.
Problems faced is point comprising resistor Rb1, Rb2 and trimming circuit 107' between node 380 and ground terminal
Depressor 230 also needs adjustment intrinsic standoff ratio because of the change of certain external negative factors.For example, assuming that process deviation causes to put in error
The reference voltage of the non-inverting input terminal input of big device 123 deviates desired value, can make output voltage VOUT1There is undesirable wave
The resistance value of dynamic variation, only calibration trimming circuit 107' can just correct above-mentioned variation.In one embodiment, in node 380
Apply an actual test voltage VTE(not shown), and judge whether the partial pressure of node 480 is equal to the second target voltage values VTH,
To voltage V at the node 480TEThe intrinsic standoff ratio for carrying out partial pressure calculating be equal to both trimming circuit 107''s and resistor Rb2
Resistance value and value, divided by resistor Rb1, Rb2 and trimming circuit 107' this three resistance value and value.Alternatively we
Need to judge voltage VTEIt is being saved by the divider that trimming circuit 107' and resistor Rb1, Rb2 are constructed by scheduled intrinsic standoff ratio
Whether partial pressure value caused by point 480 is equal to the second target voltage values VTH.Secondary calibration unit 104-1 also includes to fine tuning
The control module 108' that the total resistance value of circuit 107' is adjusted, to ensure, generated partial pressure value is in second at node 480
Target voltage VTHLevel.Trimming circuit 108' includes one or more semifixed resistor RS1、RS2、RS3、RS4、……RSi,
Each semifixed resistor in the grade resistance is accordingly all arranged to be parallel with the electronic switch SS of a three port types1、SS2、SS3、
SS4、……SSi, by the total resistance value for adjusting trimming circuit whether connection of electronic switch.Secondary calibration unit 104-1 is also
The control module 108' that the total resistance value of trimming circuit 107' is adjusted comprising one, when in one reality of application of node 380
Border test voltage VTEWhen, precise fine-adjustment amendment is carried out to the voltage at node 480, to ensure that it is big that the partial pressure at node 480 has
It causes and the second target voltage values VTHIt is equal.One or more voltage difference comparator 111' that wherein control module 108' has connect
The practical partial pressure that contracture depressor 230 provides at node 480, and by the partial pressure and voltage difference comparator 111' institute received one
A second target voltage values VTHIt is compared and generates the feedback of voltage difference, instruction should increase or reduce at node 480
Partial pressure, in response to the feedback, the coding unit 112' that control module 108' has generates corresponding two according to the voltage difference
System symbol receives this series of binary code metadata by a burning unit 113' of control module 108', and is written
Register 114' to control module 108' is used as control electronic switch SS1、SS2、……SSiThe control signal whether connected
TRIMS1、TRIMS2、……TRIMSi, each control signal TRIMSiCorrespondence is transmitted to a corresponding electronic switch SSi's
Control terminal (i is greater than the natural number equal to 1).It should be appreciated that in addition to the embodiment to be, any ADC converter by voltage difference
It is converted to Bit numerical digit and is suitable for the present invention.By the partial pressure and the second target voltage values V at node 480THBetween voltage difference sentence
The quantity that electronic switch is switched on or disconnects in disconnected trimming circuit 107', until the voltage at node 480 has the second target electricity
Pressure value VTHLevel.
It is in the normal voltage conversion stage in voltage converting branch 103-1, receives the electricity that primary calibration unit 102 provides
Press VPAnd power switch QM1 and QM2 enter the alternation switch switching state stage, it is more accurately anti-at the generation of node 480 one
Present branch pressure voltage VFB, it is input to the inverting input terminal of error amplifier 123, it is defeated with the non-inverting input terminal institute of error amplifier 123
The reference voltage V enteredREF2It is compared generation error signal and is sent to comparator 124.Because of the all-in resistance of trimming circuit 107'
Value is accurately corrected, the output voltage V accordingly generatedOUT1Also relatively more accurate.
In addition, another advantage of the invention also resides in, it is possible to reduce the quantity of semifixed resistor is equivalent to saving register
Memory capacity or volume, such as all at least reduce a number of semifixed resistor from every voltage converting branch, and set
The quantity of semifixed resistor is equal to the reduction amount of semifixed resistor in voltage converting branch in first divider 220.It is embodied in, it is assumed that electricity
Power-switching circuit in the primary calibration unit 102 of no enabling (namely prior art), voltage converting branch 103-1,103-2,
103-3 ... 103-N is directly to the first reference voltage VREF1In the state of implementing modulation, the of a certain voltage converting branch 103-M
Original semifixed resistor initial number is Sum1 in two divider 230.And when power-switching circuit is introducing the first calibration unit 102
When (namely enable the present invention), the semifixed resistor quantity having in the first divider 220 is Sum2, utilizes voltage converting branch
103-1,103-2,103-3 ... the voltage V that 103-N provides the first calibration unit 102PIn the state of implementing modulation, wherein
Sum2 < Sum1, our way are that the total quantity of semifixed resistor can be arranged to be substantially equal in the second divider 230 at this time
Sum1 subtracts Sum2.In other words, using the first calibration unit 102 for without using the first calibration unit 102, voltage turns
Change branch 103-1,103-2,103-3 ... each of 103-N branch can reduce quantity be at least Sum2 fine tuning electricity
Resistance, then the semifixed resistor quantity that entire electric pressure converter is saved on the whole is about at least about (N-1) × Sum2.More than, lead to
Cross description and accompanying drawings, give the exemplary embodiments of the specific structure of specific embodiment, foregoing invention propose it is existing compared with
Good embodiment, but these contents are not intended as limiting to.For a person skilled in the art, various after reading above description
Variations and modifications undoubtedly will be evident.Therefore, appended claims should regard as cover true intention of the invention and
Whole variations and modifications of range.The range and content of any and all equivalences, are all considered as still in Claims scope
It belongs to the intent and scope of the invention.
Claims (15)
1. a kind of power-switching circuit characterized by comprising
One primary calibration unit, receives the first reference voltage provided by band gap reference and calibrates to it；
One or more voltage converting branch, respectively to primary calibration unit provide voltage implement voltage modulated and whereby accordingly
Ground provides one or more output voltages；And
Each voltage converting branch includes at least the secondary calibration unit for having the second divider, and the second divider is to it
The output voltage of affiliated voltage converting branch transmission is divided to generate feedback voltage, and secondary calibration unit for pair
Its second divider having, which is calibrated, generates error to avoid feedback voltage.
2. a kind of power-switching circuit according to claim 1, which is characterized in that primary calibration unit includes one first
Divider, the trimming circuit that can be changed with total resistance value and with the concatenated one or more resistors of the trimming circuit；
The voltage that primary calibration unit output is arranged is equal to by the first divider according to partial pressure caused by scheduled intrinsic standoff ratio
First reference voltage.
3. a kind of power-switching circuit according to claim 2, which is characterized in that primary calibration unit also includes one right
The control module that the total resistance value of trimming circuit is adjusted, to ensure that the voltage of primary calibration unit output is in one first
Target voltage values level；And
Trimming circuit includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch,
By the total resistance value for adjusting trimming circuit whether connection of electronic switch.
4. a kind of power-switching circuit according to claim 3, which is characterized in that the voltage difference ratio that control module has
Compared with device by its received first target voltage value be compared and generate voltage difference with the voltage of primary calibration unit output, control
The coding unit that molding block has generates corresponding binary element according to the voltage difference and is written to the register of control module
As control signal, the corresponding control that signal is controlled by one of the control terminal of each electronic switch；
The quantity that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference, until primary calibration unit is defeated
Voltage out has first target voltage value level.
5. a kind of power-switching circuit according to claim 1, which is characterized in that the second divider includes that total resistance value can
The trimming circuit of change and with the concatenated one or more resistors of the trimming circuit；
Secondary calibration unit passes through the voltage that will be applied on its divider with scheduled intrinsic standoff ratio in second partial pressure
A partial pressure is generated on device.
6. a kind of power-switching circuit according to claim 5, which is characterized in that secondary calibration unit also includes one right
The control module that the total resistance value of trimming circuit is adjusted, to ensure that the partial pressure that secondary calibration unit provides is in one second
The level of target threshold voltage；And
Trimming circuit includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch,
By the total resistance value for adjusting trimming circuit whether connection of electronic switch.
7. a kind of power-switching circuit according to claim 6, which is characterized in that the voltage difference ratio that control module has
Compared with device by its received second target voltage values voltage difference is compared and generated with the partial pressure that the second divider provides, control
The coding unit that module has generates corresponding binary element and be written to the register of control module according to the voltage difference to be made
To control signal, the corresponding control for being controlled signal by one of the control terminal of each electronic switch；
The quantity that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference, until point that divider provides
Pressure is in the second target voltage values level.
8. a kind of method of voltage conversion, which comprises the following steps:
A primary calibration unit for receiving the first reference voltage provided by band gap reference is provided, to the first reference voltage into
Row calibration；
Using one or more voltage converting branch, voltage modulated and whereby is implemented to the voltage that primary calibration unit provides respectively
One or more output voltages are correspondingly provided；
At least providing in each voltage converting branch includes the secondary calibration unit for having the second divider, utilizes the
Two divider divide the output voltage of the voltage converting branch transmission belonging to it to generate feedback voltage, and using time
The second divider that grade calibration unit has it, which is calibrated, generates error to avoid feedback voltage.
9. according to the method described in claim 8, having it is characterized in that, primary calibration unit includes first divider
The variable trimming circuit of total resistance value and with the concatenated one or more resistors of the trimming circuit；
The voltage that primary calibration unit output is arranged is equal to by the first divider according to partial pressure caused by scheduled intrinsic standoff ratio
First reference voltage.
10. according to the method described in claim 9, it is characterized in that, primary calibration unit also includes one to trimming circuit
The control module that total resistance value is adjusted, to ensure that the voltage of primary calibration unit output is in a first target voltage value
Level；And
Trimming circuit includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch,
By the total resistance value for adjusting trimming circuit whether connection of electronic switch.
11. according to the method described in claim 10, it is characterized in that, the voltage difference comparator that has of control module is by its institute
Received first target voltage value is compared and generates voltage difference with the voltage of primary calibration unit output, and control module has
Coding unit according to the voltage difference generate corresponding binary element and be written to control module register as control letter
Number, the corresponding control that signal is controlled by one of the control terminal of each electronic switch；
The quantity that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference, until primary calibration unit is defeated
Voltage out has first target voltage value level.
12. according to the method described in claim 8, it is characterized in that, the second divider includes the variable fine tuning electricity of total resistance value
Road and with the concatenated one or more resistors of the trimming circuit；
Secondary calibration unit passes through the voltage that will be applied on its divider with scheduled intrinsic standoff ratio in second partial pressure
A partial pressure is generated on device.
13. according to the method for claim 12, which is characterized in that secondary calibration unit also includes one to trimming circuit
The control module that total resistance value is adjusted is in second target voltage with the partial pressure for ensureing that secondary calibration unit provides
Level；And
Trimming circuit includes that one or more semifixed resistors and each semifixed resistor are all arranged to be parallel with an electronic switch,
By the total resistance value for adjusting trimming circuit whether connection of electronic switch.
14. according to the method for claim 13, which is characterized in that the voltage difference comparator that control module has is by its institute
Received second target voltage values are compared with the partial pressure that the second divider provides and generate voltage difference, what control module had
Coding unit generates corresponding binary element and be written to the register of control module according to the voltage difference is used as control signal,
The corresponding control that signal is controlled by one of the control terminal of each electronic switch；
The quantity that electronic switch is switched on or disconnects in trimming circuit is judged by the voltage difference, until point that divider provides
Pressing element has the second target voltage values level.
15. a kind of power-switching circuit characterized by comprising
One has the first calibration unit of the first divider, receives the first reference voltage provided by band gap reference and utilizes
First divider calibrates the first reference voltage；
One or more voltage converting branch, respectively to the first calibration unit provide voltage implement voltage modulated and whereby accordingly
Offer one or more output voltage, each voltage converting branch include at least one have the second divider the second school
Quasi- unit, the second divider divide to generate feedback voltage the output voltage of the voltage converting branch transmission belonging to it,
And the second divider that the second calibration unit is used to have it, which is calibrated, generates error to avoid feedback voltage；
Any one voltage converting branch is set in when not enabling the first calibration unit it and directly implements to adjust to the first reference voltage
Original semifixed resistor initial number is Sum1 in the second divider in the state of system, when setting the when enabling the first calibration unit
The semifixed resistor total quantity having in two divider is no more than Sum1.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105912059B (en) * | 2016-05-23 | 2017-08-15 | 深圳创维－Rgb电子有限公司 | The reference voltage of integrated circuit trims circuit and system |
| DE102016210798B3 (en) * | 2016-06-16 | 2017-11-23 | Siemens Aktiengesellschaft | Power semiconductor circuit |
| KR102324194B1 (en) * | 2017-05-22 | 2021-11-10 | 삼성전자주식회사 | Voltage trimming circuit including anti-fuses, operating method thereof, and integrated circuit having the voltage trimming circuit |
| CN109980926B (en) * | 2019-04-30 | 2024-05-14 | 苏州易美新思新能源科技有限公司 | Multichannel serial power supply |
| CN112799457B (en) * | 2020-12-31 | 2022-12-13 | 深圳市紫光同创电子有限公司 | Voltage calibration circuit and method |
| CN114115424A (en) * | 2021-12-31 | 2022-03-01 | 京微齐力(北京)科技有限公司 | Band-gap reference source circuit with low-voltage structure |
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