CN104052262B - Digital voltage for power IC compensates - Google Patents
Digital voltage for power IC compensates Download PDFInfo
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- CN104052262B CN104052262B CN201310464431.9A CN201310464431A CN104052262B CN 104052262 B CN104052262 B CN 104052262B CN 201310464431 A CN201310464431 A CN 201310464431A CN 104052262 B CN104052262 B CN 104052262B
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Abstract
Provide the system and method for the digital voltage compensation in power IC.In at least one embodiment, method includes receiving digital voltage code, and the digital voltage code corresponds to output voltage values；Setting output to count on the first counter makes it from current first digital counting corresponding to current voltage code value to the digital counting of target first change corresponding to new voltage code value；And second is counted on the second counter when receiving the new voltage code value and is arranged to offset count value.Methods described also includes combining second counting and the output is counted to form combinatorial enumeration value；And second count value is set to be decremented to zero from the offset count value when first counter reaches first digital counting of target.
Description
The cross reference of related application
Present application requires the priority of United States provisional application the 61/792,745th filed in 15 days March in 2013
Right, the disclosure of the application case are incorporated herein by reference.
Technical field
The present invention relates generally to the power supply for processing unit, and more particularly, between different voltage levels
Sluggish system and method are reduced during transformation, wherein voltage is supplied by power supply.
Background of invention
The output impedance that controller for CPU (CPU) is generally specified with client operates.For example, with electricity
Stream rise, the output voltage (V of power supplyOutput) reduced in a controlled manner from request (VID) voltage.When requiring that controller changes its VID
During voltage, extra load electric current is confessed to output filter capacitor (VID risings) or imports extra load from filter condenser
Electric current (VID declines).But controller cannot be distinguished by this extracurrent and normal load circuit, cause VOutputSluggishness and house
Enter.Sometimes, the tolerable time for being converted to new VID voltages is specified by CPU design requirement, and is transmitted a signal to CPU and shown
Transformation between different voltage levels is completed.If VOutputIt is sluggish, then CPU can apply high current loads to unripe
VOutput, cause VOutputDrop below asked voltage.
Brief summary of the invention
Provide the system and method for the digital voltage compensation in power IC.In at least one embodiment
In, method includes receiving digital voltage code, and the digital voltage code corresponds to output voltage values；Set on the first counter defeated
Go out to count and make it from current first digital counting corresponding to current voltage code value to the target first corresponding to new voltage code value
Digital counting changes；And second is counted on the second counter when receiving the new voltage code value and is arranged to skew meter
Numerical value.Methods described also includes combining second counting and the output is counted to form combinatorial enumeration value；And when described
First counter makes second count value be decremented to zero from the offset count value when reaching first digital counting of target.
Brief description
It should be understood that accompanying drawing only depicted example embodiment and scope is therefore should not be considered limiting, will be by using accompanying drawing
With additional features and detailed description exemplary, wherein：
Fig. 1 is to be used to manage offer opening to the voltage of processor in an embodiment described in present disclosure
Close the block diagram of voltage regulator；
Fig. 2 is the schematic diagram of the power circuit in an embodiment described in present disclosure；
Fig. 3 A and Fig. 3 B are that diagram is provided not by prior art power circuit in response to the voltage that processor is asked
With the figure of voltage；
Fig. 4 A and Fig. 4 B be illustrate present disclosure described in an embodiment in by power circuit in response to
The figure for the offset voltage managed the voltage that device is asked and provided；With
Fig. 5 is the method that voltage is provided in response to digital voltage code in an embodiment described in present disclosure
Flow chart.
According to common practice, described different parts it is not to scale but be depicted as emphasizing with it is exemplary
The relevant particular elements of embodiment.
Main element symbol description in accompanying drawing
100 switching regulaors
102 processors
104 digital analog converters (DAC)
106 error amplifiers and compensation circuit
108 decline circuit
109 offset counters
110 modulators
111 output filters
113 control circuits
115 normal counters
117 power switches
200 regulators
206 error amplifiers and compensation circuit
208 decline circuit
210 modulators
212 feedback voltage signals
214 feedback resistors
216 resistors
217 power switches
218 capacitors
220 feedback nodes
222 resistors
224 capacitors
226 capacitors
228 error controling signals
230 amplifiers
300A schemes
300B schemes
The VID of 302 requests
The voltage that 304A is provided
The voltage that 304B is provided
306 high-voltage levels
308 low voltage levels
The VID of 402 requests
The voltage that 404A is provided
The voltage that 404B is provided
406 voltage levels
408 voltage levels
410 skews
412 linearly count down
414 indexes count down
500 methods
502 methods
504 methods
506 methods
508 methods
510 methods
514 methods
516 methods
518 methods
Embodiment
In being described in detail below, the accompanying drawing for forming a part herein is referred to, and is wherein shown by illustrating
Certain illustrative embodiment.It should be understood, however, that other embodiments can be used and logic can be made, mechanically and electrically changed.
In addition, the method presented in accompanying drawing and detailed description should not be construed as limiting the enforceable order of independent step.Therefore, retouch in detail below
Limited significance should not be had by stating.
The power circuit that core supply voltage is provided for CPU (CPU) is typically transported with the output impedance specified
Make, i.e. as load current raises, output voltage reduces from the voltage of request in a controlled manner.When requiring that power circuit will carry
When the voltage of confession changes over new value, extra load electric current is confessed capacitor into output filter or from output on demand
Capacitor in wave filter imports, with to capacitor charge or discharge.Power circuit may cannot be distinguished by this extracurrent with
Normal load circuit, cause sluggishness and rounding-off of the output voltage when it is moved to new magnitude of voltage.CPU manufacturer, which may specify, to be held
Perhaps the time is moved to new voltage, and can impose requirement so that power circuit transmits a signal to CPU and shown within the tolerable time just
As having supplied new voltage without extracurrent.If sluggishness increases voltage to the CPU of power supply current loading simultaneously, phase
When in higher target core voltage, then relatively low（It is sluggish）Output voltage can cause output voltage to drop below CPU suitably to transport
Minimum voltage needed for making.
Power circuit usually contains control circuit, and the control circuit includes register, to preserve the confession corresponding to request
Answer the digital code of voltage；Counter, to feed digital analog converter (DAC), wherein DAC produces the reference of output voltage；With
Numeric components, to determine the relative value of register and counter.When the electricity for receiving the request higher than the output of existing DAC count device
When pressing code (VID), counter starts counting up（Pass through clock signal）Until its numeral output is equal to the content of register（Preservation pair
Should be in the code of the supply output voltage of request）.As discussed below, according to embodiment of the present invention, when upward transformation starts
Offset is added to counting, and the DAC of offset count feed drive reference voltage.Cause it when normal counting reaches desired value
During equal to register, offset count is counted down to zero.When VID code adjusts upward output voltage, the addition of offset will not
The sluggishness of electric power output voltage is caused, it is any undesirable so as to be caused when VID code adjusts electric power output voltage downwards
Undershoot.
Fig. 1 is the block diagram for managing the regulator 100 for the electric power for being fed to processor 102.Processor
102 can be configured for performing any device of machine readable instructions.For example, processor 102 may serve as CPU and on
Literary and hereafter so use, term CPU and processor are interchangeable.When executing an instruction, the consumption of processor 102 passes through switching voltage
Adjuster 100 is supplied to the electric power of processor 102.In some practical matters, the electricity consumed by processor 102 depends on processing
The computational load of device 102（That is, clock speed）.For example, when requiring that processor 102 performs many instructions in short period of time,
Compared with processor 102 is in idle condition, processor 102 may require that higher supply voltage and can consume more electric power.
In some embodiments, in order to implement to calculate, processor 102 asks the increase before it increases its clock speed electric by switching
The voltage for pressing adjuster 100 to provide.In addition, the increase of voltage can have the related time limit, switching voltage is adjusted within the time limit
Device 100 will provide the voltage of increase.If the supply voltage of increase is not provided to processor 102 within the time limit, then can break
The bad instruction by processor 102 performs.
In at least one practical matter, when processor request voltage increase, processor 102 sends digital voltage (VID)
Regulator 100 is asked, digital VID requests are sent to the control of control digital analog converter (DAC) 104 by it
Circuit 113.Digital VID requests require the specific voltage level from power circuit 100.Asked in response to digital VID, control electricity
Road 113 indicates that the analog representation that DAC104 asks digital VID is sent to error amplifier and compensation electricity as the reference voltage
Road 106.In addition to the analog reference voltage received from DAC104, error amplifier and compensation circuit 106 also connect from square 108
Receive drop-out current, wherein drop-out current be to processor 102 used in the proportional electric current of load current summation and can wrap
Include the electric current needed for the filter condenser charge or discharge in output filter 111 is made during programming output voltage changes.With
Error amplifier and compensation circuit 106 and receive drop-out current from 108, the output voltage of regulator 100 is under
Drop electric current increases and reduced in a controlled manner.It is attributed to as supply voltage VOutputChange corresponding to the VID issued by processor 102
And making the electric current needed for the output capacitor charge or discharge of output filter 111 when changing, extra drop-out current is by declining electricity
Confess circuit 106 or imported from circuit 106 in road 108.Because error amplifier and compensation circuit 106 are due to programming VOutputFrom just
The change of normal drop-out current changes because load current changes and cannot be distinguished by the change of drop-out current, therefore works as VOutputAccording to from
When the request VID of processor 102 changes and changed, regulator 100 exports VOutputSluggishness is simultaneously rounded.Asked in rise
In the case of voltage, the sluggishness and rounding-off that are attributed to drop-out current 108 can cause regulator 100 to provide immediately to be less than
Ask the voltage of voltage and can cause to destroy execute instruction.In the case where reducing request voltage, sluggish and rounding-off can cause
More electric power are temporarily consumed needed for processor ratio and carry out execute instruction, but in downward VOutputSluggishness during adjustment will not cause
Destroy processor running.The voltage provided by error amplifier and compensation circuit 106 is input into modulator 110（Typically arteries and veins
Rush width modulator PWM）In.Modulator 110 controls power switch 117, and it provides phase voltage.Phase voltage is by producing VOutputOutput
The output filter 111 of voltage to processor 102 is filtered.In addition, power switch 117 and output filter 111 are couple to
The power supply V of external systemInput。
In order to prevent regulator 100 from sluggish and rounding-off occurs in the upward change in response to asking voltage,
The data that DAC104 is sent to by control circuit 113 are shifted by so that providing to error amplifier and the voltage of compensation circuit 106
Reach before time with reference to needed for reaching target voltage in output voltage and more than the target voltage of request（That is its overshoot pair
The target reference voltage of Ying Yuxin VID codes）.For example, when the request of processor 102 is higher than previous VID new VID, switching voltage
Control circuit 113 in adjuster 100 receives the VID of request and can initialize two counters：Normally (VID) counter and
Offset counter 109.Offset counter 109 output be added to normal counter 115, its be sent to DAC104 control by
The reference voltage that DAC104 is provided.Normal counter 115 count down to the fresh target voltage of request, then stops.Counted when normal
It can be fixed value that device 115, which is counting hour offset counter 109, and when normal counter 115 reaches desired value, skew meter
Number device 109 starts to count down to zero.Therefore, provide DAC104 digital counting by control circuit 113 and provided by DAC104
Analog references to error amplifier and compensation circuit 106 are a kind of when VID starts to change, before VID code starts change
Start from higher（Skew）Value rather than reference voltage and the value for reaching more than the final goal voltage of request, then rapid drawdown return to
The voltage of the target voltage of request.Due to suitably have selected skew, so the output voltage of regulator 100 is being asked
Reach the target voltage of request in time, slightly overshoot the target voltage of request and change back to the target voltage of request.It is right
For the VID value less than the request of current voltage value, identical function can be implemented.When the request of processor 102 receives less than current
During the voltage of voltage, control circuit 113 subtracts offset count from normal counter 115 and provides New count to DAC104,
When normal counter 115 reaches desired value, offset count successively decreases to zero.Due to offset, so the ginseng provided by DAC104
Examine voltage and get lower than final goal voltage and then rise sharply and return to target voltage.Because some systems can be to crossing low output voltage
It is extremely sensitive, so when voltage is converted to low voltage from high voltage, small shift can be used（Or without using skew
Amount）.
Fig. 2 is the schematic diagram of illustrative switch voltage regulator 200.As shown, error amplifier and compensation circuit 206 carry
For the error amplifier in Fig. 1 and the more detailed figure of compensation circuit 106.Other circuits correspond to name similar to its in Fig. 1
Circuit.That is, 202 correspond to 102,204 corresponds to 108,209 corresponding to 109,210 corresponding to 110,211 corresponding to 104,208
Correspond to 113,215 corresponding to 111,213 and correspond to 115 and 217 corresponding to 117.
In some practical matters, error amplifier and compensation circuit 206 receive three inputs and control signal 228 is defeated
Go out to modulator 210.Three inputs are the reference voltages from DAC204, from 208 drop-out current and from switching voltage
The feedback voltage signal 212 of the output end of adjuster 200（VOutput）.Error amplifier and compensation circuit 206 and modulator 210 use
Three input to adjust the switching frequency of power switch 217 and/or pulse width to maintain to correspond roughly to be supplied by DAC204
Reference value output voltage.Error amplifier and compensation circuit 206 can control gain and phase behaviour to meet to provide electric power
Expectation quality and response time to load.In certain embodiments, error amplifier 230 is the one of integrated controller electronics
Part and the resistor and capacitor of error amplifier and compensation circuit 206 are external modules.In other embodiments, error
The resistor and capacitor of amplifier and compensation circuit 206 are also a part for integrated controller electronics.
In at least one practical matter, error amplifier 230 can be differential amplifier, and it is received with reference to electricity from DAC204
Press and amplify reference voltage and feedback node 220 at voltage between difference.Error amplifier and the component of compensation circuit 206
It may include resistor 214,216 and 222 and capacitor 218,224 and 226.In order to reduce the defeated of the function as output current
Go out voltage, feedback resistor 214 is transmitted through from 208 drop-out current.From 208 higher drop-out current（Correspond to
Compared with top adjustment device output current）The voltage drop on resistor 216 is increased, so as to cause relatively low output voltage VOutput.Error is put
The compensation circuit of big device and compensation circuit 206 is the single reality of the possibility compensation circuit in error amplifier and compensation circuit 206
Apply.It will be appreciated by those skilled in the art that it there may be and be envisioned with many other implementations of compensation circuit herein.
In some prior art practical matters, work as VOutputBecause of asking for other devices from processor or request voltage change
When asking VID code change and changing, power circuit（Such as regulator 100）Can insufficient compensation or overcompensation surplus
Drop-out current.Fig. 3 A and Fig. 3 B are to illustrate the output voltage provided by power circuit compared with the request VID from processor
Figure.For example, Fig. 3 A are to illustrate the power circuit by insufficient compensation in response to request higher voltage level 308 and low voltage
Both the request VID302 of level 306 and the voltage 304A Figure 30 0A provided.As shown in fig. 3, when power circuit is insufficient
Compensation（Or complete uncompensation）VOutputChange caused drop-out current to change, and the VID302 asked is from low voltage level 308
When rising to high-voltage level 306, there is provided output voltage 304A lag behind the VID302 of request so that as the VID302 of request
When being moved to high-voltage level 306 from low voltage level 308, there is provided voltage 304A a period of time in be less than request
VID302.Because the voltage 304A provided is less than the VID302 of request, the operation of processor can become negatively affected.Phase
Instead, when the VID of request is moved to low voltage level 308 from high-voltage level 306, there is provided voltage 304A still lag behind request
VID302, but because the VID of request is moved to low voltage level 308 from high-voltage level 306, so the voltage provided
The voltage 304A that the VID302 that 304A lags behind request causes to provide is higher than the VID302 asked.When the voltage 304A of offer is higher than
During the VID302 of request, processor can correctly play function but can be than required or than it is expected temporary transient to draw more electric power.
In prior art embodiment is substituted, there is prior art between the paraphase input of error amplifier and ground
The compensation based on R-C, output voltage can be by overcompensation.Fig. 3 B be diagram by this overcompensation power circuit in response to
Figure 30 0B for the voltage 304B for asking higher voltage level 308 and both the request VID302 of lower voltage level 306 and providing.
As shown in Figure 3 B, change in power circuit overcompensation drop-out current, the situation for causing V outputs to change by VID code change
Under, the VID302 of request rises to high-voltage level 306 from low voltage level 308, there is provided voltage 304B with request
VID302 rises but because rising above the voltage level of high-voltage level 306 and then downward transition returns to high voltage together
Level 306 and overshoot high-voltage level 306.It is contrasted with the power circuit of Fig. 3 A insufficient compensation, by crossing electricity of leaping high
Voltage level 306, the voltage 304B provided when the VID302 of request is converted to high-voltage level 306 from low voltage level 308 etc.
In or higher than request VID302.Because the voltage 304B provided receives the voltage provided higher than the VID302 of request
The performance of 304B processor will not become negatively affected.On the contrary, when request VID302 be converted to from high-voltage level 306 it is low
During voltage level 308, the power circuit of overcompensation can negatively affect the performance of processor.For example, the because voltage provided
304B is provided by the power circuit of overcompensation, so the voltage 304B provided will be flushed to less than low electricity under low voltage level 308
The voltage level of voltage level 308.Because provide voltage 304B undershoots low voltage level 308, when request VID302 from
The performance of processor can be damaged when high-voltage level 306 is converted to low voltage level 308.
In some prior art practical matters, as shown in the compensation circuit 206 in Fig. 2, external discrete component is added
The system that the system can be changed over to overcompensation into the system of insufficient compensation.If for example, resistors in series/electric capacity
Device combination from feedback node 220 is connected to ground, then is moved to and higher or lower follows the increase of DAC204 voltages when 220
Or when reducing, the circuit of addition will be confessed in 220 during voltage changes from 220 remittance electric currents or by electric current.But when
When DAC204 voltages increase or reduced, identical compensation is added.For example, if system response is as in Fig. 3 A and the appropriate string of addition
The expected response of Fig. 3 B upward direction is realized in connection resistor/capacitor combination, then system also by Fig. 3 B downwards
Responded to undesirable undershoot is provided.
When power circuit is by insufficient compensation or when being not compensated for, because programming VOutputThe effect of drop-out current caused by change,
It can be used to ensure that the voltage provided by power circuit is equal to or more than above for the DAC offset methods of the invention of Fig. 1 descriptions
Corresponding to the voltage of the VID code from processor during upward transformation, or more closely follow desired downward transition.Fig. 4 A and
Fig. 4 B are that diagram works as power circuit from DAC（Including the DAC offsets according to the present invention）When receiving reference voltage, by power circuit
Figure of the voltage of offer compared with corresponding to the reference voltage of the VID code from processor.
Fig. 4 A are illustrated when the VID402 of request is converted to high-voltage level 406 from low voltage level 408, are had by electricity
The figure of the implementation of the DAC offsets for the voltage 404A that source circuit provides.As indicated, when the VID402 of request starts from low-voltage electricity
Flat 408 when being converted to high-voltage level 406, and offset 410 is added to the voltage 404A of offer by DAC.In at least one implementation
Xiang Zhong, offset 410 exist as offset count, and it is added to the low VID value counting started from corresponding to voltage level 408
To the normal counting of the high VID value corresponding to voltage level 406.When normal counting reaches the height electricity corresponding to voltage level 406
Usually, DAC starts to count down offset count to zero.By applying offset 410, there is provided voltage 404A overshoot by processor
Or the voltage of other device requests so that VID402s of the voltage 404A of offer higher than request.
In some practical matters, offset increases with the increase (Δ VID) that the VID code of request changes so that skew
Amount 410 can be calculated as being equal to K1+K2Δ VID, wherein K1It is to program offset, K2Be programming gain and Δ VID correspond to height
The VID code of voltage level 406 and corresponding to the difference between the VID code of low voltage level 408.In addition, work as offset 410 to zero
When counting down, using it is linear count down 412 or index count down and 414 offset can be made to go to zero.It is also contemplated within people in the art
Member is known to substitute other methods that count down（Function）Offset count is counted down to zero.In some practical matters, work as skew
When amount is linearly counted down, the voltage 404A of offer be present can become less than the VID402 risk of request.By the way that skew is counted
Number exponentially to zero-turn become, reduce offer voltage 404A become less than request VID402 risk.In addition, in some realities
Apply in scheme, offset 410 is limited in a certain value.
Fig. 4 B are diagrams when the VID402 of request is converted to corresponding to voltage electricity from the high level corresponding to high-voltage level 406
During flat 408 low value, there is the figure of the implementation of the voltage 404B provided by power circuit the DAC offsets according to the present invention.
As indicated, when the VID402 of request starts to be converted to low voltage level 408 from high-voltage level 406, negative offset amount 410 by
DAC is added to the voltage 404b of offer.In at least one practical matter, offset 410 exists as offset count, and it is from the beginning of
It count down in low level normal counting and subtracts from high level.When normal counting reaches the low level corresponding to voltage level 408
When, DAC, which starts to return to offset count to zero, to be counted.By applying offset 410, there is provided voltage 404B can be faster to low
Voltage level 408 moves.Equally, can be with when the VID402 of request is converted to low voltage level 408 from high-voltage level 406
Counted down and 414 and similar counted down negative offset counting counting is returned into zero using the linear 412, index that counts down.When undershoot is
In the case of undesirable, the negative offset amount applied in the adjustment of downward VID code can be eliminated（That is, only in upward VID code adjustment period
Between apply offset）Or alternatively, it can reach in VID counters corresponding to VOutputOpened before the relatively low desired value of target level 408
Beginning offset counter counts down.
Fig. 5 is the flow chart for offseting the method 500 provided to the DAC reference voltages of error amplifier.In order to offset
DAC reference voltages, method 500 start from 502, wherein receiving digital voltage changes request.For example, processor sends out new VID code
It is sent to control circuit.Then method 500 proceeds to 504, wherein based on new VID code and the existing VID corresponding to existing DAC voltage
The comparison of code calculates digimigration amount.Then method 500 proceeds to 506, and wherein digimigration amount counts for default bias
Device and the digimigration amount are added to the numerical value of VID counters, and VID counters then start to correspond to new VID to it
The fresh target value of code counts.The numerical value of the summation of VID counters and offset counter provides analog references electricity by DAC uses
Pressure.In addition, VID（Normally）Counter is asked based on digital voltage（New VID code）Whether to higher or lower value（Corresponding to higher
Or relatively low fresh target output voltage）Change and increasing or decreasing.
In at least one exemplary practical matter, method 500 proceeds to 508 to determine VID counters output valve and new VID
Whether desired value is equal to each other.If VID counters output valve and desired value are not equal to each other, then method 500 proceeds to
510, wherein VID counters count to fresh target value.If the output valve and fresh target value of VID counters are equal to each other, then
Method 500 proceeds to 512, and wherein VID counters stop and offset counter is successively decreased to zero.Therefore, method 500 proceeds to
514 come determine offset counter whether be equal to zero.If offset count is not equal to zero, then method 500 proceeds to 516, wherein
Offset count is to zero count（Successively decrease）.If offset count is equal to zero, then method 500 proceeds to 518, wherein corresponding to new
The fresh target value of VID code is provided to DAC, and wherein power circuit then provides request voltage to processor.Can be via modulation
Implement different count distributions for making the counter frequency that offset counter successively decreases（Such as linear, index etc.）.
Exemplary
Example 1 includes a kind of power supply for providing output voltage, and the power supply includes：Error amplifier, it is based on referring to
Voltage is with representing that the feedback voltage of output voltage is compared to control power supply, and an input of error amplifier is via at least
One resistor is coupled to feedback voltage, and wherein error amplifier receives is represented by the output voltage of feedback voltage；Decline
Circuit, it produces drop-out current, so as to fall drop-out voltage at least one resistor of institute；First counter, it has base
In the digital voltage code corresponding to output voltage values received and from current first digital meter corresponding to current voltage code value
Number counts to the output of the digital counting of target first change corresponding to new voltage code value；Second counter, it is defeated with second
Go out to count and be preset to offset count value when receiving new voltage code value, wherein the output of the first counter counts and second
Second output of counter counts combination to produce combinatorial enumeration value；Wherein when the first counter reaches the digital counting of target first
When the second counter the second output is counted from offset count value be decremented to zero；With digital analog converter (DAC), it is constructed
Reference voltage is provided into based on combinatorial enumeration value, wherein DAC is being converted to new voltage code value corresponding to from current voltage code value
Output voltage is based on offset count value come deflection reference voltage during changing.
Example 2 includes the power supply of example 1, wherein turning when output voltage from the lower voltage value corresponding to current voltage code value
When changing to the higher voltage value corresponding to new voltage code value, DAC carrys out deflection reference voltage corresponding to offset count value.
Example 3 includes the power supply of example 2, and wherein control circuit overcompensation is because from lower voltage value to higher voltage value
Drop-out current caused by output voltage transformation changes.
Example 4 include example 1 to 3 in any instance power supply, wherein the second counter from offset count value linearly to
Zero counts down.
Example 5 include example 1 to 4 in any instance power supply, wherein the second counter from offset count value index number to
Zero counts down.
Example 6 includes the power supply of any instance in example 1 to 5, and wherein offset count value is new voltage code value and current electricity
Press the function of the difference between code value.
Example 7 includes the power supply of any instance in example 1 to 6, and wherein offset count value is the letter of predetermined programming deviant
Number.
Example 8 includes the power supply of any instance in example 1 to 7, and it also includes the modulator for being couple to error amplifier, its
Described in modulators modulate input voltage be used to for output voltage provide electric power.
Example 9 includes the power supply of any instance in example 8 to 9, and wherein output voltage provides supply voltage for processor, and
Wherein digital voltage code is produced by processor.
Example 10 includes the regulator of example 9, wherein when the first counter has reached the numeral of target first
Notifier processes device during counting.
Example 11 includes a kind of method for providing electric power, and methods described includes：Receive digital voltage code, the numeral
Voltage code corresponds to output voltage values；Setting output to count on the first counter makes it from working as corresponding to current voltage code value
Preceding first digital counting changes to the digital counting of target first corresponding to new voltage code value；When receiving new voltage code value
Second is counted on second counter and is arranged to offset count value；Combination second, which counts, to be counted with output to form combinatorial enumeration
Value；And the second count value is set to be decremented to zero from offset count value when the first counter reaches the first digital counting of target.
Example 12 includes the method for example 11, wherein when current voltage code value corresponds to lower voltage value and new voltage code value
Offset count value is set during corresponding to higher voltage value on the second counter.
Example 13 includes the method for any instance in example 11 to 12, and it also includes：Reference is provided based on combinatorial enumeration value
Voltage；On error amplifier by reference voltage compared with representing the feedback voltage of output voltage, wherein error amplifier
An input be couple to feedback voltage via at least one resistor, wherein error amplifier is received by feedback voltage
Output voltage represents；By falling drop-out voltage at least one resistor to produce drop-out current.
Example 14 includes the method for any instance in example 11 to 13, wherein making the second count include following at least one
It is individual：Second is counted and is linearly changed to zero；With by the second count index to zero change.
Example 15 includes the method for any instance in example 11 to 14, and wherein offset count value is following at least one letter
Number：The newly difference between voltage code value and current voltage code value；With predetermined programming deviant.
Example 16 includes a kind of system for providing power to processor, and the system includes：Processor, it is by structure
Cause to perform machine readable instructions, wherein processor provides digital voltage code；First counter, it, which has, is based on digital voltage code
And from current first digital counting corresponding to current voltage code value to the digital counting of target first corresponding to new voltage code value
The output of change counts；Second counter, there is the second output to count and be preset to when receiving digital voltage code partially for it
Count value is moved, is combined wherein the output of the first counter counts to count with the second of the second counter to produce combinatorial enumeration value,
Wherein when the first counter reaches the first digital counting of target, the second counter makes the second counting be decremented to from offset count value
Zero；Digital analog converter (DAC), it is configured to provide reference voltage based on combinatorial enumeration value；Error amplifier, it is by structure
Cause by reference voltage compared with representing the feedback voltage of output voltage, an input of error amplifier is via at least
One resistor is coupled to feedback voltage；Decline circuit, it produces drop-out current, so as at least one resistor
Fall drop-out voltage；And modulator, it is couple to error amplifier, and wherein modulators modulate input voltage is used to provide electric power
To processor.
The system that example 17 includes example 16, wherein when output voltage from the lower voltage value corresponding to current voltage code value
When being converted to the higher voltage value corresponding to new voltage code value, DAC corresponds to the second counting and carrys out deflection reference voltage.
The system that example 18 includes example 17, wherein control circuit overcompensation is because from lower voltage value to higher voltage value
Output voltage transformation caused by drop-out current change.
Example 19 include example 16 to 18 in any instance system, wherein the second counter by it is following it is at least one come
Successively decrease the second counting：Second is counted and is linearly changed to zero；With by the second count index to zero change.
The system that example 20 includes any instance in example 16 to 19, wherein offset count value is following at least one letter
Number：The newly difference between voltage code value and current voltage code value；With predetermined programming deviant.
Although having illustrated and having described particular herein, persons skilled in the art, which will be appreciated that, to be intended to realize
Any configuration of identical purpose can replace the particular shown.Therefore, the present invention is clearly intended to be limited only by right
It is required that and its equivalent.
Claims (40)
1. a kind of power supply for providing output voltage, the power supply include：
Error amplifier, its based on by reference voltage with representing that the feedback voltage of the output voltage is compared to described in control
Power supply, an input of the error amplifier is couple to feedback voltage via at least one resistor, wherein the error
Amplifier receives to be represented by the output voltage of the feedback voltage；
Decline circuit, it produces drop-out current, so as to fall drop-out voltage at least one resistor；
First counter, it has based on the digital voltage code corresponding to output voltage values received and from corresponding to current electricity
Current first digital counting of code value is pressed to be counted to the output of the digital counting of target first change corresponding to new voltage code value；
Second counter, there is the second output to count and be preset to offset count when receiving the new voltage code value for it
Value, wherein second output that the output of first counter is counted with second counter is counted and combined to produce
Raw combinatorial enumeration value；
Second counter described in wherein when first counter reaches first digital counting of target makes described second defeated
Go out to count from the offset count value and be decremented to zero；With
Digital analog converter (DAC), it is configured to provide the reference voltage based on the combinatorial enumeration value, wherein described
Digital analog converter (DAC) turns corresponding to the output voltage that the new voltage code value is converted to from the current voltage code value
The reference voltage is offset based on the offset count value during change.
2. power supply according to claim 1, wherein when the output voltage from corresponding to the current voltage code value compared with
When low voltage value is converted to the higher voltage value corresponding to the new voltage code value, the digital analog converter (DAC) is corresponding
The reference voltage is offset in the offset count value.
3. power supply according to claim 2, in addition to control circuit, the control circuit overcompensation is because from the relatively low electricity
Drop-out current caused by pressure value to the output voltage transformation of higher voltage value changes.
4. power supply according to claim 1, wherein second counter linearly falls from the offset count value to zero
Count.
5. power supply according to claim 1, wherein second counter falls from the offset count value index number to zero
Count.
6. power supply according to claim 1, wherein the offset count value is the new voltage code value and the current electricity
Press the function of the difference between code value.
7. power supply according to claim 1, wherein the offset count value is the function of predetermined programming deviant.
8. power supply according to claim 1, it also includes the modulator for being couple to the error amplifier, wherein the tune
Device modulation input voltage processed is used to provide electric power for the output voltage.
9. power supply according to claim 8, wherein the output voltage provides supply voltage for processor, and it is wherein described
Digital voltage code is produced by the processor.
10. power supply according to claim 9, wherein when first counter has reached the digital meter of target first
The processor is notified during number.
11. a kind of method for providing electric power, methods described includes：
Digital voltage code is received, the digital voltage code corresponds to output voltage values；
Setting output to count on the first counter makes it from current first digital counting corresponding to current voltage code value to right
The digital counting of target first of Ying Yuxin voltage code values changes；
Second is counted on the second counter when receiving the new voltage code value and is arranged to offset count value；
Described second is combined to count with the output counting to form combinatorial enumeration value；And
Make second count value when first counter reaches first digital counting of target from the offset count
Value is decremented to zero.
12. according to the method for claim 11, wherein when the current voltage code value corresponds to lower voltage value and described
New voltage code value sets the offset count value when corresponding to higher voltage value on second counter.
13. according to the method for claim 11, it also includes：
Reference voltage is provided based on the combinatorial enumeration value；
On error amplifier by the reference voltage compared with representing the feedback voltage of output voltage, wherein the error
One input of amplifier is couple to feedback voltage via at least one resistor, passes through wherein the error amplifier receives
The output voltage of the feedback voltage represents；
By falling drop-out voltage at least one resistor to produce drop-out current.
14. according to the method for claim 11, wherein making second count including following at least one：
Described second is counted and is linearly changed to zero；With
Change to zero by second count index.
15. according to the method for claim 11, wherein the offset count value is following at least one function：
Difference between the new voltage code value and the current voltage code value；With
Predetermined programming deviant.
16. a kind of system for providing power to processor, the system includes：
Processor, it is configured to perform machine readable instructions, wherein the processor provides digital voltage code；
First counter, it has based on the digital voltage code and from current first digital meter corresponding to current voltage code value
Number counts to the output of the digital counting of target first change corresponding to new voltage code value；
Second counter, there is the second output to count and be preset to offset count when receiving the digital voltage code for it
Value, combined wherein the output of first counter counts to count with described the second of second counter to produce group
Total numerical value, wherein the second counter described in when first counter reaches first digital counting of target makes described the
Two countings are decremented to zero from the offset count value；
Digital analog converter (DAC), it is configured to provide reference voltage based on the combinatorial enumeration value；
Error amplifier, it is configured to by reference voltage compared with representing the feedback voltage of output voltage, the error
One input of amplifier is couple to the feedback voltage via at least one resistor；
Decline circuit, it produces drop-out current, so as to fall drop-out voltage at least one resistor；With
Modulator, it is couple to the error amplifier, wherein the modulators modulate input voltage is used to provide power to
The processor.
17. system according to claim 16, wherein when the output voltage is from corresponding to the current voltage code value
When lower voltage value is converted to the higher voltage value corresponding to the new voltage code value, the digital analog converter (DAC) is right
Second counts to offset the reference voltage described in Ying Yu.
18. system according to claim 17, in addition to control circuit, the control circuit overcompensation is because from described relatively low
Drop-out current caused by magnitude of voltage to the output voltage transformation of higher voltage value changes.
19. system according to claim 16, wherein second counter pass through it is following at least one described to successively decrease
Second counts：
Described second is counted and is linearly changed to zero；With
Change to zero by second count index.
20. system according to claim 16, wherein the offset count value is following at least one function：
Difference between the new voltage code value and the current voltage code value；With
Predetermined programming deviant.
21. a kind of power supply for providing output voltage, the power supply include：
Error amplifier, its based on by reference voltage with representing that the feedback voltage of the output voltage is compared to described in control
Power supply；
Digital analog converter (DAC), it is couple to the error amplifier, and the digital analog converter (DAC) is to described
Error amplifier provides reference voltage；And
Control circuit, it provides digital voltage code, the digital analog converter to the digital analog converter (DAC)
(DAC) digital voltage code is converted into reference voltage, wherein when digital voltage code starts from current voltage code value to new electricity
Offset count value is added to digital voltage code by the control circuit during pressure code value transformation, wherein combination offset count value and numeral electricity
Pressure code is provided to the digital analog converter (DAC), wherein when output voltage reaches the new value corresponding to new voltage code value
Shi Suoshu control circuits make the offset count value be decremented to zero.
22. power supply according to claim 21 a, wherein input of the error amplifier is via at least one electricity
Resistance device is couple to feedback voltage.
23. power supply according to claim 22, in addition to decline circuit, it produces drop-out current, so as to it is described at least
Drop-out voltage is fallen on one resistor.
24. power supply according to claim 21, wherein the control circuit includes the first counter, it has from current electricity
The output changed to new voltage code value of code value is pressed to count.
25. power supply according to claim 24, wherein the control circuit includes representing that the second of offset count value counts
Device, wherein the second counter and the first counter described in when digital voltage code starts to change from current voltage code to new voltage code
Combination.
26. power supply according to claim 25, wherein second described in when first counter reaches new voltage code value
Counter is decremented to zero.
27. power supply according to claim 21, wherein the offset count value be the new voltage code value with it is described current
The function of difference between voltage code value.
28. power supply according to claim 21, wherein the offset count value is the function of predetermined programming deviant.
29. power supply according to claim 21, it also includes the modulator for being couple to the error amplifier, wherein described
The input voltage of power supply described in modulators modulate is used to provide electric power for the output voltage.
30. power supply according to claim 29, wherein the output voltage provides supply voltage, and wherein institute for processor
Processor is stated to generate the digital voltage code and the digital voltage code is supplied into control circuit.
31. power supply according to claim 30, wherein notifying the processing when the output voltage reaches the new value
Device.
32. a kind of method for providing electric power, methods described includes：
Digital analog converter (DAC) is supplied to using current voltage code value as digital voltage code；
Reference voltage is supplied to by error amplifier from the digital analog converter (DAC) based on digital voltage code, wherein institute
State error amplifier based on by reference voltage with representing that the feedback voltage of output voltage of power supply is compared to control the electricity
Source；
Receive new voltage code value；
Offset count value is added into the digital voltage code；
Digital voltage code is changed from current voltage code value to new voltage code value；And
The offset count value is set to successively decrease when output voltage reaches the new value corresponding to new voltage code value.
33. according to the method for claim 32, wherein the first counter changes from current voltage code value to new voltage code value.
34. according to the method for claim 33, in addition to when digital voltage code starts from current voltage code to new voltage code
The second counter and the first counter are combined during transformation, wherein second counter represents offset count value.
35. according to the method for claim 34, wherein making the offset count value successively decrease including when the first counter reaches
The offset count value is set to be decremented to zero during new voltage code value.
36. according to the method for claim 32, wherein when current voltage code value corresponds to lower voltage value and new voltage code
When value corresponds to higher voltage value, offset count value is arranged on the second counter.
37. according to the method for claim 34, wherein making second count including following at least one：
Second counter described in linear decrease；And
Second counter described in exponential decrease.
38. according to the method for claim 32, wherein the offset count value is following at least one function：
Difference between the new voltage code value and the current voltage code value；With
Predetermined programming deviant.
39. a kind of system for providing power to processor, the system includes：
Processor, it is configured to perform machine readable instructions, wherein the processor provides digital voltage code；
Voltage regulator, it is couple to the processor, and output voltage is supplied to processor, the electricity by the voltage regulator
Pressure adjuster includes：
Digital analog converter (DAC), it is configured to provide reference voltage based on digital voltage code；
Control circuit, it is configured to provide digital voltage code to the digital analog converter (DAC), wherein working as digital voltage
Offset count value is added to digital voltage code by the control circuit when code starts to change from current voltage code value to new voltage code value,
Wherein combine offset count value and digital voltage code is provided to the digital analog converter (DAC), wherein working as output voltage
The control circuit makes the offset count value be decremented to zero when reaching the new value corresponding to new voltage code value；
Error amplifier, it is configured to reference voltage compared with representing the feedback voltage of the output voltage and provided
Input voltage；With
Modulator, it is couple to the error amplifier and receives input voltage from the error amplifier, wherein the modulation
Device modulation input voltage is used to provide power to the processor.
40. the system according to claim 39, in addition to control circuit, the wherein control circuit include：
First counter, there is the output changed from current voltage code value to new voltage code value to count for it；And
The second counter of offset count value is represented, wherein when digital voltage code starts to change from current voltage code to new voltage code
The counters of Shi Suoshu second combine with the first counter, wherein making institute when first counter reaches the new voltage code value
State the second counter and be decremented to zero.
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| US13/851,651 US9118245B2 (en) | 2013-03-15 | 2013-03-27 | Digital voltage compensation for power supply integrated circuits |
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| CN108199581B (en) | 2021-01-08 |
| CN104052262A (en) | 2014-09-17 |
| CN108199581A (en) | 2018-06-22 |
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