CN1828466A - Voltage supply interface and method for adjusting electric current - Google Patents
Voltage supply interface and method for adjusting electric current Download PDFInfo
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- CN1828466A CN1828466A CN 200610006885 CN200610006885A CN1828466A CN 1828466 A CN1828466 A CN 1828466A CN 200610006885 CN200610006885 CN 200610006885 CN 200610006885 A CN200610006885 A CN 200610006885A CN 1828466 A CN1828466 A CN 1828466A
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- 238000005516 engineering process Methods 0.000 description 3
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Abstract
A voltage supply interface provides both coarse and fine current control with reduced series resistance. The voltage supply interface has a segmented switch having N component switches that are digitally controlled. The voltage supply interface replaces a conventional sense resistor with a calibration circuit that has a replica switch that is a replica of the N component switches. The calibration circuit includes a reference current I REF that is sourced through the replica switch. A voltage comparator forces a common voltage drop across the replica switch and the n-of-N activated component switches so that the cumulative current draw through the segmented switch is n.I REF . The current control of the voltage interface can be coarsely tuned by activating or deactivating component switches, and can be finely tuned by adjusting the reference current. The current sense resistor is eliminated so that the overall series resistance is lower.
Description
Technical field
The present invention relates to voltage supply interface, more particularly, relate to a kind of voltage supply interface of controlling more accurately with littler serial resistance that has.
Background technology
Voltage supply interface provides voltage and current for from the primary voltage source next stage circuit arrangement.When the next stage circuit arrangement was connected to the primary voltage source, voltage supply interface used switch to open this next stage circuit arrangement at leisure.
Voltage supply interface is monitored the electric current that offers this next stage circuit arrangement offers this next stage current flow devices with control power.The conventional voltage source interface uses the inductive reactance of connecting with the next stage circuit arrangement to come monitor current.This inductive reactance requires enough greatly just can provide the precise current monitoring.But it is very big that this causes through the voltage drop of this inductive reactance, reduced the power that offers the next stage circuit arrangement.In addition, adopt the single switch that can not regulate, be difficult to provide adjustable current.
Therefore, just need a kind of voltage supply interface that can accurately control and reduce or eliminate the power loss that needed inductive reactance causes to the electric current that offers the next stage circuit arrangement.
Summary of the invention
The technical problem to be solved in the present invention is, can't accurately adjust electric current, the big defective of power loss at the above-mentioned of prior art, and a kind of voltage supply interface that has electric current coarse adjustment and electric current fine setting and have the serial resistance of minimizing is provided.Described voltage supply interface has diversity switch, and described diversity switch has N numerically controlled first switch.Described voltage supply interface substitutes traditional inductive reactance with calibration circuit, and this calibration circuit comprises the profiling switch, and this profiling switch is the profiling of described N first switch in parallel.Described calibration circuit has the reference current I that comes from calibration circuit
REFVoltage comparator makes to have common voltage on n the first switch that is unlocked in described profiling switch and described N first switch and falls, and is nI so that flow through the total current of diversity switch
REFThis voltage supply interface can also can come fine-adjusting current by adjusting described reference current by opening and cutting off first switch and come the coarse adjustment electric current.Owing to cancelled induction by current resistance, therefore total serial resistance is lower.
In one embodiment of the invention, provide a kind of voltage supply interface, comprise diversity switch, calibration circuit and digitial controller.Described diversity switch comprises N first switch in parallel.Described calibration circuit is in parallel with described diversity switch, is used to provide reference current I
REFDescribed digitial controller is connected between described calibration circuit and the described diversity switch, is used for opening described N the first switch of the n in first switch in parallel.The common voltage of described diversity switch of process and described profiling switch falls and makes the total current that flows through described diversity switch equal nI in fact
REFFirst switch of opening or cutting off described parallel connection falls in described digitial controller based on described common voltage.Described calibration circuit comprises current source and is applied the profiling switch of bias voltage by described current source.Provide the fine setting of total current by adjusting described current source.Described calibration circuit also comprises voltage comparator, is used to provide the common voltage through described diversity switch and described profiling switch to fall.The output terminal of described voltage comparator is connected to described digitial controller.Described N first switch in parallel is big or small in fact identical with described profiling switch.
In another embodiment of the present invention, provide a kind of the primary voltage source has been offered the method that the electric current of subordinate's circuit arrangement is adjusted.The profiling switch is by reference current I
REFApply bias voltage.The profiling switch has common voltage with the diversity switch that contains N first switch in parallel and falls.Fall n first switch opening in the individual first switch in parallel of described N based on described common voltage, thereby make the total current that flows through described diversity switch equal nI in fact
REFVoltage comparator is facilitated the landing of described common voltage and indicating value that described common voltage is fallen offers digitial controller.Described digitial controller is opened based on described common voltage landing or is cut off first switch in parallel so that the coarse adjustment of total current to be provided.Come described total current is finely tuned by adjusting described reference current.
In yet another embodiment of the present invention, provide a kind of voltage supply interface, comprised profiling switch, diversity switch, voltage comparator and digitial controller.Described profiling switch is by reference current I
REFApply bias voltage.Described diversity switch comprises the first switch of a plurality of parallel connections, and with described profiling switch in parallel.Described digitial controller provides the common voltage through described diversity switch and described profiling switch to fall.Described digitial controller is opened 0 or the first switch of how described parallel connection based on described common voltage landing.The total current that flows through described diversity switch equals to flow through the summation of the single current of 0 of being opened or the first switch of a plurality of parallel connections in fact.
According to an aspect of the present invention, provide a kind of voltage supply interface, comprising:
Diversity switch, described diversity switch comprise N first switch in parallel;
Calibration circuit, described calibration circuit is in parallel with described diversity switch so that reference current I to be provided
REF
Digitial controller, described digitial controller are connected between described calibration circuit and the described diversity switch to open described N the first switch of the n in first switch in parallel;
Wherein, described diversity switch and described calibration circuit have common voltage and fall, and make in described n in parallel first switch of opening the electric current and the I of each first switch conduction
REFProportional, form the total current that flows through described diversity switch.
Preferably, described diversity switch is connected between primary voltage source and the next stage circuit arrangement.
Preferably, described digitial controller falls n first switch opening in the individual first switch in parallel of described N based on the common voltage of described diversity switch and described calibration circuit.
Preferably, in parallel first switch that described n is opened, the electric current of flowing through on each first switch equals I in fact
REF
Preferably, described calibration circuit also comprises:
Current source is used to provide reference current I
REF
The profiling switch is by reference current I
REFApply bias voltage;
Voltage comparator provides the common voltage of described profiling switch and described diversity switch to fall.
Preferably, the output node of described profiling switch is connected on the first input end of described voltage comparator, and the output node of described diversity switch is connected on second input end of described voltage comparator.
Preferably, the input node of described profiling switch links to each other with the input node of described diversity switch.
Preferably, described N first switch in parallel is big or small in fact identical with described profiling switch.
Preferably, described N first switch in parallel and described profiling switch all are field effect transistors.
Preferably, the output terminal of described voltage comparator is connected on the described digitial controller.
Preferably, adjust described current source to finely tune described reference current I
REF
According to a further aspect in the invention, provide a kind of method of adjusting electric current, comprising:
(1) by reference current I
REFApply bias voltage for the profiling switch;
(2) make described profiling switch and diversity switch have common voltage and fall, wherein, described diversity switch comprises N first switch in parallel;
(3) fall based on described common voltage and open described N the first switch of the n in first switch in parallel, make in described n in parallel first switch of opening electric current and I that each first switch conducts
REFProportional, thus the total current that flows through described diversity switch formed.
Preferably, described step (3) also comprises:
(a) determine to fall through the common voltage of described profiling switch and described diversity switch.
Preferably, described step (3) also comprises:
(b) use digitial controller to open described N the first switch of the n in first switch in parallel.
Preferably, described method also comprises:
(4) monitoring is fallen through the common voltage of described profiling switch and described diversity switch.
Preferably, described step (4) also comprises:
(a) open more first switch in parallel flows through described diversity switch with increase total current.
Preferably, described step (4) also comprises:
(a) cut off more first switch in parallel to reduce to flow through the total current of described diversity switch.
Preferably, described step (4) also comprises:
(a) adjust described reference current I
REFSo that the total current that flows through described diversity switch is finely tuned.
In accordance with a further aspect of the present invention, provide a kind of voltage supply interface, comprising:
The profiling switch is by reference current I
REFApply bias voltage;
Diversity switch, described diversity switch comprise the first switch of a plurality of parallel connections, and with described profiling switch in parallel;
Voltage comparator provides the common voltage through described diversity switch and described profiling switch to fall;
Digitial controller falls control described a plurality of parallel connections first switch based on described common voltage, wherein, the electric current of first switch of each unlatching of flowing through in fact with I
REFProportional;
Wherein, through the total current of described diversity switch, equal to flow through the summation of the single current of first switch of being opened.
Preferably, described N first switch size in parallel is different.
Preferably, in parallel first switch of a described N different sizes becomes binary weighting to each other.
Preferably, the total current that flows through described diversity switch equals nI in fact
REF
Preferably, described N first switch size in parallel is different.
Preferably, in parallel first switch of a described N different sizes becomes binary weighting to each other.
Preferably, each electric current of first switch in parallel of being opened becomes binary weighting to each other.
Preferably, each electric current of first switch in parallel of being opened equates to each other, and equals I in fact
REF
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the synoptic diagram of conventional voltage source interface;
Fig. 2 is the synoptic diagram of digital voltage source interface;
Fig. 3 is the synoptic diagram according to the calibration digital voltage source interface of serial resistance with reduction of the present invention and electric current coarse adjustment ability;
Fig. 4 is the synoptic diagram that has the serial resistance of minimizing and have the calibration digital voltage source interface of electric current coarse adjustment and fine-tuning capability simultaneously according to of the present invention;
Fig. 5 is the process flow diagram of the method for the electric current that adjustment offers the next stage circuit arrangement according to the present invention.
Embodiment
Shown in Figure 1 is conventional voltage source interface 100.Conventional voltage source interface 100 is connected to primary voltage source V
PRIMARYThis conventional voltage source interface 100 provides voltage source V for the next stage circuit arrangement
SUPPLYThis conventional voltage source interface 100 provides the power supply supply for the next stage circuit arrangement by using analog controller 102, inductive reactance 104 and switch 106.Switch 106 common field-effect transistors (FET) realize, but the present invention is not limited to this kind treatment technology.The present invention also can adopt other treatment technologies well-known to those having ordinary skill in the art.
Conventional voltage source interface 100 has the electrostatic discharge (ESD) defencive function usually.As shown in Figure 1, conventional voltage source interface 100 comprises ESD circuit 108, these ESD circuit 108 ground connection (GND) and with primary voltage source V
PRIMARYLink to each other.These ESD circuit 108 protection analog controller 102 and switches 106.Conventional voltage source interface 100 also comprises ESD circuit 110, this ESD circuit 110 ground connection (GND) and and voltage source V
SUPPLYLink to each other.This ESD circuit 110 protection and V
SUPPLYThe next stage circuit arrangement that links to each other.
When the next stage circuit arrangement is connected to V
SUPPLYThe time, analog controller 102 is opened switch 106 at leisure.Analog controller 102 is opened this next stage circuit arrangement at leisure by opening switch 106 at leisure.After this next stage circuit arrangement starts, in case complete opening, the effect that analog controller 102 and switch 106 just serve as fuse.That is, analog controller 102 monitoring offer the electric current of this next stage circuit arrangement, if this electric current has surpassed maximum level, analog controller 102 cuts off switch 106.
Usually, the electric current by inductive reactance 104 is small, therefore, analog controller 102 accurately to measure electric current, necessarily requires the resistance of inductive reactance 104 enough big.V
PRIMARYAnd V
SUPPLYBetween total resistance by inductive reactance 104 resistance and the summation of the conducting resistance of switch 106 determine.The serial resistance of this combination has reduced V
SUPPLYOffer the voltage of next stage circuit arrangement.Basically, the voltage drop of passing switch 106 and inductive reactance 104 becomes the power that slatterns.Therefore, total resistance of the conducting resistance of the resistance of expectation inductive reactance 104 and switch 106 is as much as possible little.
Keep total resistance of conducting resistance of the resistance of inductive reactance 104 and switch 106 as much as possible little, just require the conducting resistance of switch 106 as much as possible little.The conducting resistance of switch 106 must be as much as possible little, because the resistance of inductive reactance 104 must be correspondingly big to reach the purpose of accurately measuring electric current.Can be by increasing the conducting resistance that FET reduces switch 106.But this has increased package dimension (die size), and can increase the stray capacitance of switch 106.
Shown in Figure 2 is digital voltage source interface 200.Digital voltage source interface 200 comprises digitial controller 202, analog to digital converter (ADC) 204, inductive reactance 204 and diversity switch 206.Diversity switch 206 by N first switch in parallel (shown in 206-1,206-2 ... 206-N) form.Each first switch in parallel can be realized with the identical FETs of size.In another embodiment, the FETs of this N first switch in parallel is a different sizes.For example, the FETs that constitutes N first switch in parallel can be two to each other and advance weighting, also can adopt other size design scheme.That is to say that the size ratio difference of this N first switch in parallel does not depart from the scope of the present invention (as the switch size design of binary weighting).
ADC 204 measures the voltage drop of process inductive reactance 104 and the digital indicating value of this voltage drop is provided for digitial controller 202.Digitial controller 202 is opened and is cut off a part of described N FETs in parallel and flows to V with adjustment based on this voltage drop
SUPPLYElectric current.More specifically, digitial controller 202 is adjusted electric current by the door that the control word 208 of sending the N bit wide drives this N FETs in parallel.
The parallel connection of the conducting resistance of the FETs that digitial controller 202 is opened is made up, and has determined the conducting resistance of diversity switch 206.These FETs open manyly more, and are just big more through the electric current of diversity switch 206; These FETs open fewly more, and are just more little through the electric current of diversity switch 206.Therefore, the parallel connection that constitutes N FETs of diversity switch 206 is made up, and compares with the switch 106 of traditional voltage supply interface 100, can control and regulate the electric current that offers the next stage circuit arrangement more accurately.
Shown in Figure 3 is according to calibration digital voltage source interface 300 of the present invention.Calibration digital voltage source interface 300 comprises the diversity switch of being made up of N FETs in parallel 206.Diversity switch 206 links to each other with digitial controller 302.Calibration digital voltage source interface 300 also comprises calibration circuit 304.Calibration circuit 304 comprises profiling switch 306.The FET that profiling switch 306 usefulness are identical with each FET size of the N that forms diversity switch 206 FET in parallel realizes.Profiling switch 306 is by low bias voltage V
LCarry out bias voltage (so this profiling switch is unlocked).At node 312 places, profiling switch 306 is connected to V
SUPPLYWith diversity switch 206.
As shown in Figure 3, calibration circuit 304 comprises current source 308.Current source 308 provides reference current I
REF Calibration circuit 304 also comprises voltage comparator 310.Voltage comparator 310 plays differentiating amplifier.The first input end of voltage comparator 310 is connected with current source 308, profiling switch 306; Second input end of voltage comparator 310 is connected with node 314.The output terminal of voltage comparator 310 is connected with digitial controller 302.
When operation, the electric current that flows through profiling switch 306 equals I
REFVoltage comparator 306 makes the voltage drop that equals process diversity switch 206 through the voltage drop of profiling switch 306.At any time, the N in the diversity switch 206 FETs in parallel has n to open.Therefore, the voltage drop of this FET of composition profiling switch 306 equals the voltage drop of n FETs in parallel of unlatching in the diversity switch 206.Like this, when the FET size in this n FET and the profiling switch 306 was all identical, the total current that flows through diversity switch 206 was nI
REFSelectively, as mentioned above,, can obtain the different total current values that flows through diversity switch 206 when these each different time of first switch size in parallel.For example, the size of these first switches in parallel can be two to advance weighting between mutually, advances the current increment of weighting thereby produce two.Like this, each diversity switch can both generate corresponding and I
REFProportional single current (comprises I
REFMultiple and mark), therefore, I
REFChange can cause the change of each first switching current in parallel in the corresponding diversity switch 206.Like this, bigger electric current can offer the next stage circuit arrangement that is connected to calibration digital voltage source interface 300.
Shown in Figure 4 is the calibration digital voltage source interface 400 that has electric current coarse adjustment and fine-tuning capability simultaneously according to of the present invention.Calibration digital voltage source interface 400 comprises adjustable current source 408.For example, this adjustable current source 408 can be a programmable current source.Thereby adjustable current source 408 can be adjusted and offer the electric current that profiling switch 306 offers diversity switch 206.More specifically, can adjust the reference current I that adjustable current source 408 provides by factor alpha
REF
Adjust reference current I by factor alpha
REFThereby, can finely tune the electric current that offers the next stage circuit arrangement.Therefore, calibration digital voltage source interface 400 provides the electric current coarse adjustment by each FETs that opens and cut off in the diversity switch 206, also by adjusting the reference current I that adjustable current source 408 provides
REFThe electric current fine setting is provided.In a word, the total current that flows through diversity switch 206 equals α nI
REF
Calibration digital voltage source interface 300 shown in Figure 3 and calibration digital voltage source interface 400 shown in Figure 4 all provide lower serial resistance value.Particularly removed the big inductive reactance that needs for monitor current.Removed inductive reactance, the bigger conducting resistance that calibration digital voltage source interface 300 and calibration digital voltage source interface 400 can both be stood from each FETs of diversity switch 206.And each FETs size can be littler, thereby reduced space requirement and stray capacitance.The degree of accuracy of traditional voltage supply interface is subject to big inductive reactance.In calibration digital voltage source interface 300 and calibration digital voltage source interface 400, this limitation has obtained solution, and, by each FETs in the coupling diversity switch 206 and the FET in the profiling switch 306, can determine degree of accuracy.
Shown in Figure 5 is process flow diagram 500, and this process flow diagram flows through the operation steps of the electric current of next circuit arrangement by the voltage supply interface adjustment corresponding to the calibration digital voltage source interface according to the present invention among Fig. 4.But the present invention is not limited to this operation and describes.According to the content that this paper told about, those skilled in the art knows that obviously other operation control flows do not depart from the scope and spirit of the present invention.To set forth step shown in Figure 5 below.
In the step 502, producing size by adjustable current source is I
REFReference current.
In the step 504, by reference power source I
REFApply bias voltage for the profiling switch.
In the step 506, make the voltage drop that equals process profiling switch through the voltage drop of diversity switch.
In the step 508, determine to fall through the common voltage of diversity switch and profiling switch.
In the step 510, open n first switch in N first switch in parallel forming diversity switch.
In the step 512, be total size nI
REFElectric current offer the next stage circuit arrangement.
In the step 514, monitoring is fallen through the common voltage of diversity switch and profiling switch.
In the step 516, adjust the total current that offers this next stage circuit arrangement.The electric current coarse adjustment is to realize by in parallel first switch of opening and cut off in the diversity switch.Open more first switch in parallel and can increase the total current that flows through diversity switch roughly; Cut off the total current that more first switch in parallel can reduce to flow through diversity switch roughly.The electric current fine setting is by adjusting the reference current I that adjustable current source provides
REFRealize.More specifically, be to adjust electric current I by factor alpha
REFThereby the total current that flows through diversity switch 206 equals α nI
REF
Voltage supply interface according to process flow diagram 500 operations offers the next stage circuit arrangement to adjusted total current, and continues monitoring and adjust this total current.Shown in step 518 among the figure.
Some embodiment of the present invention are set forth above, but the present invention is not limited to cited embodiment.Those skilled in the art obviously knows, in form and the various changes on the details do not depart from the scope and spirit of the present invention.Therefore, scope of the present invention only defines according to claim and its equivalence replacement.
It is the U.S. Provisional Patent Application No.60/647 on January 28th, 2005 that the present invention requires the applying date, 458 right of priority.
Claims (10)
1, a kind of voltage supply interface comprises:
Diversity switch, described diversity switch comprise N first switch in parallel;
Calibration circuit, described calibration circuit is in parallel with described diversity switch so that reference current I to be provided
REF
Digitial controller, described digitial controller are connected between described calibration circuit and the described diversity switch to open described N the first switch of the n in first switch in parallel;
Wherein, described diversity switch and described calibration circuit have common voltage and fall, and make in described n in parallel first switch of opening the electric current and the I of each first switch conduction
REFProportional, form the total current that flows through described diversity switch.
2, voltage supply interface according to claim 1 is characterized in that, described diversity switch is connected between primary voltage source and the next stage circuit arrangement.
3, voltage supply interface according to claim 1 is characterized in that, described digitial controller falls n first switch opening in the individual first switch in parallel of described N based on the common voltage of described diversity switch and described calibration circuit.
4, voltage supply interface according to claim 3 is characterized in that, in parallel first switch that described n is opened, the electric current of flowing through on each first switch equals I in fact
REF
5, voltage supply interface according to claim 1 is characterized in that, described calibration circuit also comprises:
Current source is used to provide reference current I
REF
The profiling switch is by reference current I
REFApply bias voltage;
Voltage comparator provides the common voltage of described profiling switch and described diversity switch to fall.
6, a kind of method of adjusting electric current comprises:
(1) by reference current I
REFApply bias voltage for the profiling switch;
(2) make described profiling switch and diversity switch have common voltage and fall, wherein, described diversity switch comprises N first switch in parallel;
(3) fall based on described common voltage and open described N the first switch of the n in first switch in parallel, make in described n in parallel first switch of opening electric current and I that each first switch conducts
REFProportional, thus the total current that flows through described diversity switch formed.
7, method according to claim 6 is characterized in that, described step (3) also comprises:
(a) determine to fall through the common voltage of described profiling switch and described diversity switch.
8, method according to claim 6 is characterized in that, described step (3) also comprises:
(b) use digitial controller to open described N the first switch of the n in first switch in parallel.
9, method according to claim 6 is characterized in that, described method also comprises:
(4) monitoring is fallen through the common voltage of described profiling switch and described diversity switch.
10, a kind of voltage supply interface comprises:
The profiling switch is by reference current I
REFApply bias voltage;
Diversity switch, described diversity switch comprise the first switch of a plurality of parallel connections, and with described profiling switch in parallel;
Voltage comparator provides the common voltage through described diversity switch and described profiling switch to fall;
Digitial controller falls control described a plurality of parallel connections first switch based on described common voltage, wherein, the electric current of first switch of each unlatching of flowing through in fact with I
REFProportional;
Wherein, through the total current of described diversity switch, equal to flow through the summation of the single current of first switch of being opened.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64745805P | 2005-01-28 | 2005-01-28 | |
| US60/647,458 | 2005-01-28 | ||
| US11/330,327 | 2006-01-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1828466A true CN1828466A (en) | 2006-09-06 |
| CN100487624C CN100487624C (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100068851A Expired - Fee Related CN100487624C (en) | 2005-01-28 | 2006-01-25 | Voltage supply interface and method for adjusting electric current |
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| Country | Link |
|---|---|
| CN (1) | CN100487624C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102150093A (en) * | 2008-09-11 | 2011-08-10 | 马维尔国际贸易有限公司 | Intelligent switching controller and power conversion circuits and methods |
-
2006
- 2006-01-25 CN CNB2006100068851A patent/CN100487624C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102150093A (en) * | 2008-09-11 | 2011-08-10 | 马维尔国际贸易有限公司 | Intelligent switching controller and power conversion circuits and methods |
| CN102150093B (en) * | 2008-09-11 | 2013-12-25 | 马维尔国际贸易有限公司 | Intelligent switching controller and power conversion circuits and methods |
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|---|---|
| CN100487624C (en) | 2009-05-13 |
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