CN103308751B - The modulation determination device of power circuit, modulation determining method and this power circuit - Google Patents
The modulation determination device of power circuit, modulation determining method and this power circuit Download PDFInfo
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- CN103308751B CN103308751B CN201210058709.8A CN201210058709A CN103308751B CN 103308751 B CN103308751 B CN 103308751B CN 201210058709 A CN201210058709 A CN 201210058709A CN 103308751 B CN103308751 B CN 103308751B
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Abstract
A kind of modulation determination device of power circuit, modulation determining method and this power circuit.This modulation determination device is for being coupled to a circuit under test and comprising one drive circuit and a comparator circuit.This driving circuit provides a pulse signal to one first end points of this circuit under test.This first end points that this comparator circuit is coupled to this circuit under test surveys electricity value with obtain this first end points one first, calculate this first to survey electricity value and one second and survey a difference between electric value, and by this difference is exported a comparative result compared with a threshold value, wherein this comparative result indicates this circuit under test whether to have a passive device, this power circuit is modulated, to supply an out-put supply with one first modulation system or one second modulation system for decision.
Description
Technical field
The present invention relates to a kind of modulation determination device of power circuit, modulation determining method and this power circuit, particularly a kind of power circuit with Different Modulations, and modulate determination device and modulation determining method.
Background technology
In various electronic circuit, stable power supply supply is one of essential condition guaranteeing the normal operation of electronic circuit energy.General electronic circuit can arrange a mu balanced circuit, is used to provide one and stablizes and reliable voltage level.But different electronic circuits needs different electrical power supply, in order to the voltage request of answering various electronic circuit different, power IC factory can design various different types of mu balanced circuit.For example, switching type voltage stabilizer (switchingregulator) and linear voltage regulator (linearregulator) are common voltage stabilizer, and linear voltage regulator is the simplest with low-voltage-drop linear voltage regulator (lowdropoutlinearregulator) and is widely used.
But, use different voltage stabilizers, different circuit components must be coupled.For example, when using switching type voltage stabilizer, must additional passive device (such as: inductor).If do not add passive device in the circuit of switching type voltage stabilizer, or make passive device fault because of factors such as dust aqueous vapors, short circuit will be caused, output terminal is made directly to present the square-wave signal after on-off circuit modulation, thus, not only cannot use in back-end circuit, even can injure back-end circuit element.Again for example, when using low-voltage-drop linear voltage regulator, in order to ensure quality of voltage, therefore not needing additionally to add passive device, connecting in the mode of direct short-circuit, if but add passive device, then low-voltage-drop linear voltage regulator cannot operate efficiently.
In view of this, how providing the technology that a kind of conveniently passive device detects, to guarantee that various electronic circuit (such as: voltage stabilizer) can normally operate, is the target that industry needs effort badly.
Summary of the invention
For solving foregoing problems, the invention provides a kind of modulation determination device of power circuit, modulation determining method and this power circuit.
The modulation determination device of power circuit provided by the present invention is coupled to a circuit under test and comprises one drive circuit and a comparator circuit.This circuit under test has one first end points and one second end points, and this driving circuit provides a pulse signal to this first end points.This comparator circuit is coupled to this first end points and surveys electricity value to obtain one first, calculates this and first surveys electricity value and one second and survey a difference between electric value, and this difference is exported a comparative result compared with a threshold value.This comparative result indicates this circuit under test whether to have a passive device, to determine to modulate this power circuit, to supply an out-put supply with one first modulation system or one second modulation system.
The modulation determining method of power circuit provided by the present invention comprises the following step: (a) provides an end points of pulse signal to circuit under test, b () is detected this end points and is surveyed electricity value to obtain one first, c () obtains one second and surveys electricity value, d () calculates this and first surveys electricity value and this second surveys a difference between electric value, (e) by this difference compared with a threshold value, to produce a comparative result, this comparative result indicates this circuit under test whether to comprise a passive device, and (f) modulates this power circuit according to this comparative result with one first modulation system or one second modulation system, to supply an out-put supply.
Power circuit provided by the present invention comprises a pin, one drive circuit, a comparator circuit, a suitching type mu balanced circuit, a low-voltage drop linear mu balanced circuit and a selection circuit.This pin is coupled to a circuit under test.This driving circuit is coupled to this pin, and in order to provide a pulse signal to this circuit under test.This comparator circuit is coupled to this first pin to obtain one first survey electricity value, and surveys the difference between electric value according to this first survey electricity value and one second, produces a comparative result.This selection circuit determines according to this comparative result with this suitching type mu balanced circuit or this low-voltage drop linear mu balanced circuit supply out-put supply.
The present invention surveys electricity value according to two of circuit under test two end, then the difference between these two survey electricity values and a threshold value is compared, and judges whether this circuit under test has a passive device by this.Therefore, the present invention can detect in a circuit under test whether have required passive device efficiently.When applying this technology in power circuit, power circuit just can judge whether user couples a passive device, then starts correct circuit according to this or export correct signal.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the modulation determination device that the first embodiment is shown;
Fig. 2 is the schematic diagram of the modulation determination device that the second embodiment is shown;
Fig. 3 is the process flow diagram of the modulation determining method that the 3rd embodiment is shown;
Fig. 4 is the schematic diagram of the power circuit that the 4th embodiment is shown;
Fig. 5 is the schematic diagram of the power circuit that the 5th embodiment is shown;
Fig. 6 is the schematic diagram of the power circuit that the 6th embodiment is shown;
Fig. 7 is the schematic diagram of the power circuit that the 7th embodiment is shown;
Fig. 8 is the schematic diagram of the power circuit that the 8th embodiment is shown; And
Fig. 9 is the schematic diagram of the power circuit that the 9th embodiment is shown.
[main element symbol description]
1 modulation determination device
11 driving circuits
13 comparator circuits
15 circuit under test
100 pulse signals
115 comparative results
151 first end points
153 second end points
2 modulation determination devices
21 driving circuits
23 comparator circuits
25 circuit under test
200 pulse signals
215 comparative results
251 first end points
253 second end points
4 power circuits
41 driving circuits
43 comparator circuits
44 selection circuits
45 circuit under test
47 suitching type mu balanced circuits
49 low-voltage drop linear mu balanced circuits
400 pulse signals
402 end points
430 control signals
432 comparative results
433D type flip-flop
444 multiplexers
451 pins
471 first output signals
491 second output signals
Ref second surveys electricity value
5 power circuits
504 end points
53 comparator circuits
553 pins
6 power circuits
60 phase inverters
600 pulse signals
602 end points
61 driving circuits
62D type flip-flop
63 comparator circuits
64 enable circuits
65 circuit under test
66 selection circuits
67 suitching type mu balanced circuits
69 low-voltage drop linear mu balanced circuits
632 comparative results
633 control signals
651 pins
EN-SWR inversion signal
7 power circuits
704 end points
73 comparator circuits
753 pins
8 power circuits
87 suitching type voltage-stabilizing controllers
88 selection circuits
89 low-voltage drop linear voltage-stabilizing controllers
842 error amplifiers
843 transmission locks
844 transmission locks
845P type metal oxide semiconductor field effect transistor
846N type metal oxide semiconductor field effect transistor
The inversion signal that _ EN-SWR is negative
Output exports
VDD power supply
9 power circuits
93 comparator circuits
953 pins
Embodiment
Below in detail principle of the present invention will be described in detail, and explain modulation determination device, the modulation determining method and this power circuit of power circuit provided by the present invention by embodiment.But, embodiments of the invention and be not used to restriction the present invention can must implement in any environment as described embodiments, application or mode.Therefore, the explanation about embodiment is only explaination object of the present invention, and is not used to directly limit the present invention.Need expositor, in following examples and diagram, the element relevant to non-immediate of the present invention has omitted and not shown.
The impedance of passive device and the frequency dependence of input signal.The impedance of such as inductor is directly proportional to the frequency of inputted pulse signal, and therefore, when the frequency of pulse signal is higher, the potential difference (PD) at inductance two ends is larger.This characteristic of inductor also can react survey electricity value, such as current value at other.
Fig. 1 illustrates the first embodiment of the present invention.Modulation determination device 1 comprises driving circuit 11 and comparator circuit 13, and circuit under test 15 has the first end points 151 and the second end points 153, in the present embodiment, modulation determination device 1 can be an Energy control IC, and circuit under test 15 can be the external circuit that any one need be connected with Energy control IC, jointly to export suitable power supply for back-end circuit.As shown in Figure 1, the first end points 151 of circuit under test 15 is coupled to driving circuit 11 and comparator circuit 13, and its second end points 153 is an output terminal, can ground connection or be coupled to other and have the fixing electronic circuit component surveying electricity value.
Driving circuit 11 provides the first end points 151 of pulse signal 100 to circuit under test 15.Then, comparator circuit 13 detects the first end points 151 to obtain the first survey electricity value, and calculates this and first survey second on electricity value and the second end points 153 and survey difference between electric value.Output due to the second end points 153 is an expected given value, so time second survey electricity value can built-inly be a preset value, therefore comparator circuit 13 is after detection first end points 151, direct calculating first is surveyed electricity value and built-in second and is surveyed difference between electric value, again this difference is exported comparative result 115 compared with a threshold value, comparative result 115 can indicate in circuit under test 15 whether there is a passive device.When modulating determination device 1 for a power circuit, just can according to the existence of passive device whether, determine to modulate this power circuit, to supply out-put supply with the first modulation system or the second modulation system.
In other embodiments, different depending on the kind of passive device and characteristic and the kind that survey electricity is worth, comparative result 115 can present circuit under test 15 in a different manner and whether have a passive device, the impedance of passive device such as detecting becomes positive correlation during with the frequency of pulse signal 100, if comparator circuit detects learn that the difference that the first survey electricity value and second is surveyed between electricity value is greater than threshold value, then represent that circuit under test 15 has this passive device, if the difference that the first survey electricity value and second is surveyed between electricity value is less than threshold value, then represent that circuit under test 15 does not have passive device.
Aforesaid first survey electricity value and second is surveyed electricity value and be can be magnitude of voltage or current value.This passive device can be inductor or capacitor.In different embodiments, different electricity value of surveying can be selected to realize the present invention according to the characteristic of the passive device for measuring.
The second embodiment of the present invention illustrates as Fig. 2.Modulation determination device 2 comprises driving circuit 21 and comparator circuit 23, and circuit under test 25 has the first end points 251 and the second end points 253.Because the modulation determination device 1 of modulation determination device 2 and the first embodiment is similar to, the difference of the second embodiment and the first embodiment will only be described below.
In a second embodiment, comparator circuit 23, except the first end points 251 being coupled to circuit under test 25, is also coupled to the second end points 253.Therefore, when driving circuit 21 provides pulse signal 200 to the first end points 251, comparator circuit 23 can direct-detection obtain first on the first end points 251 and survey second on electricity value and the second end points 253 and survey electric value.Comparator circuit 23 is surveyed electricity value and second and is surveyed difference between electric value and a threshold value compares to export comparative result 215 by first, whether have a passive device to indicate circuit under test 25.
Due in side circuit, the output level of the second end points 253 of circuit under test 25 is expected, such as, when modulation determination device 2 is Energy control IC, when circuit under test 25 is an outputting inductance, modulation determination device 2 and circuit under test 25 will form a suitching type mu balanced circuit (SwitchingRegulator jointly; Switching regulator, SWR), no matter therefore whether the second end points 253 is couple to comparator circuit 23, first surveys the difference between electricity value and the second survey electricity value, all predicts by some skills, and determines threshold value by this.Therefore, the input end that be input to comparator circuit 23 second surveys electricity value can be designed to ground connection when implementation, or be directly coupled to the node that other has fixed voltage, in a preferred embodiment, aforementioned second surveys the preset value that electricity value is a non-zero.As long as the first survey electricity value and the second difference surveyed between electricity value can be made to be enough to show the electrical specification in circuit under test 25, then coordinate the setting of threshold value, all effectively can judge whether circuit under test 25 has passive device.Should be noted, when comparative result 215 indicate in circuit under test 25 not there is inductance characteristic time, namely represent that the circuit of current formation can not provide power supply with SWR control method, powered-down is now needed to export, or change the control mode out-put supply not needing to use inductance with other, such as change and export the second end points 253 to the control method supply of low-voltage drop linear mu balanced circuit.
The third embodiment of the present invention is a kind of modulation determining method, and its process flow diagram illustrates in figure 3.This modulation determining method can be applicable in a power circuit, and the hardware structure realizing this modulation determining method can refer to aforesaid modulation determination device 1 and modulation determination device 2.
First, modulation determining method performs step S301, provides a pulse signal to the end points of circuit under test.Then, perform step S303, detect this end points of circuit under test to obtain the first survey electricity value.Then, perform step S305, obtain the second survey electricity value.Need expositor, in other embodiments, step S305 can perform before step S303, or step S303 and step S305 can perform simultaneously.
Then execution step S307, calculating first survey electricity value and second surveys the difference between electric value.In step S309, by this difference compared with a threshold value, produce comparative result, this comparative result indicates this circuit under test whether to have a passive device.Finally perform step S311, according to comparative result with the first modulation system or the second modulation system modulation power source circuit, to supply out-put supply.
The schematic diagram of the fourth embodiment of the present invention illustrates at Fig. 4.Power circuit 4 comprises pin 451, driving circuit 41, comparator circuit 43, suitching type mu balanced circuit 47, low-voltage drop linear mu balanced circuit (lowdropoutlinearregulator) 49 and selection circuit 44, and selection circuit 44 comprises D type flip-flop 433 and multiplexer 444.
In the present embodiment, driving circuit 41 can be P-type mos field effect transistor (p-channelmetal-oxide-semiconductorfield-effecttransistor; PMOS).In addition, driving circuit 41, comparator circuit 43, suitching type mu balanced circuit 47, low-voltage drop linear mu balanced circuit 49, D type flip-flop 433 and multiplexer 444 are all the element known by persons of ordinary skill in the technical field of the present invention, therefore not superfluous words
As shown in Figure 4, when the end points 402 of circuit under test 45 is coupled to pin 451, driving circuit 41 provides pulse signal 400 to circuit under test 45 by pin 451.Comparator circuit 43 is also detected by pin 451 and obtains first on end points 402 surveys electricity value, and calculating first survey electricity value and second surveys the electric difference be worth between Ref, and produce comparative result 432 according to this difference (such as this difference and a threshold value being compared).
Selection circuit 44, according to comparative result 432, determines to supply out-put supply with suitching type mu balanced circuit 47 or low-voltage drop linear mu balanced circuit 49.Specifically, D type flip-flop 433 couples comparator circuit 43, receives comparative result 432 from comparator circuit 43, and exports control signal 430 according to this.Multiplexer 444 is coupled to suitching type mu balanced circuit 47, low-voltage drop linear mu balanced circuit 49 and D type flip-flop 433, and according to control signal 430, the second output signal 491 that the first output signal 471 produced by suitching type mu balanced circuit 47 or low-voltage drop linear mu balanced circuit 49 produce, export pin 451 to as out-put supply by multiplexer 444, and be provided to circuit under test 45.
When power circuit 4 starts to provide out-put supply to circuit under test 45, driving circuit 41 just can stop providing pulse signal 400 to circuit under test 45.In other embodiments, driving circuit 41 can start when circuit under test connects (hot plug detections) detecting, stops after a lasting Preset Time, or completes and determined by other orders from system.
The fifth embodiment of the present invention illustrates as Fig. 5.Because the power circuit 5 of the present embodiment and the power circuit 4 of the 4th embodiment are similar to, below by the difference of only both descriptions.In the present embodiment, the end points 402 of circuit under test 45 and end points 504 are coupled to pin 451 and the pin 553 of power circuit 5 respectively, and therefore, comparator circuit 53, except obtaining the first survey electricity value via pin 451, also directly obtains the electric value of the second survey by pin 553.Comparator circuit 53 calculates the first survey electricity value and second again and surveys difference between electric value, and this difference and a threshold value is compared and export comparative result 432.Whether D type flip-flop 433 and multiplexer 444 passive device again indicated by comparative result 432 exists, and select to work by different way, the second output signal 491 that the first output signal 471 produced by suitching type mu balanced circuit 47 or low-voltage drop linear mu balanced circuit 49 produce exports pin 451 to as out-put supply, and then is provided to circuit under test 45.
Fig. 6 illustrates the sixth embodiment of the present invention.Power circuit 6 comprises pin 651, driving circuit 61, comparator circuit 63, suitching type mu balanced circuit 67, low-voltage drop linear mu balanced circuit 69 and selection circuit 66, and selection circuit 66 then comprises D type flip-flop 62, phase inverter 60 and enable circuits 64.
The end points 602 of circuit under test 65 is coupled to power circuit 6 by pin 651.In the present embodiment, driving circuit 61 can be a P-type mos field effect transistor.Driving circuit 61 provides pulse signal 600 to pin 651, pulse signal 600.Comparator circuit 63 is coupled to pin 651, and obtain first on pin 651 and survey electric value, calculating first is surveyed electricity value and default second and surveyed the electric difference be worth between Ref, then produces comparative result 632 according to this difference.
Selection circuit 66, according to comparative result 632, determines to supply out-put supply with suitching type mu balanced circuit 67 or low-voltage drop linear mu balanced circuit 69.Specifically, D type flip-flop 62 is coupled to comparator circuit 63, exports control signal 633 according to comparative result 632.The input end of phase inverter 60 is coupled to D type flip-flop 62, and produces inversion signal EN-SWR according to control signal 633.Enable circuits 64 couples suitching type mu balanced circuit 67, low-voltage drop linear mu balanced circuit 69 and phase inverter 60, receives inversion signal EN-SWR from phase inverter 60, and according to the enable suitching type mu balanced circuit 67 of inversion signal EN-SWR or low-voltage drop linear mu balanced circuit 69.The suitching type mu balanced circuit 67 be enabled or low-voltage drop linear mu balanced circuit 69 supply out-put supply to circuit under test 65 through pin 651.
Fig. 7 illustrates the seventh embodiment of the present invention, the end points 602 of circuit under test 65 and end points 704 are coupled to pin 651 and the pin 753 of power circuit 7 respectively, comparator circuit 73 receives the first survey electricity value by the first pin 651, also the second survey electricity value is received by the second pin 753, calculating according to this first survey electricity value and second surveys the difference between electric value, and by difference and threshold value are compared and export comparative result 632.
Fig. 8 illustrates the eighth embodiment of the present invention.Similar to the power circuit 6 of the 6th embodiment, power circuit 8 also comprise pin, 651, driving circuit 61 and comparator circuit 63, the element described in the power circuit 6 of the coupling mode of these elements and function mode and the 6th embodiment is identical, therefore not superfluous words.
Power circuit 8 separately comprises selection circuit 88, P-type mos field effect transistor 845, N-type mos field effect transistor 846, suitching type voltage-stabilizing controller 87 and low-voltage drop linear voltage-stabilizing controller 89.P-type mos field effect transistor 845, N-type mos field effect transistor 846 and suitching type voltage-stabilizing controller 87 can form suitching type mu balanced circuit; P-type mos field effect transistor 845, N-type mos field effect transistor 846 and low-voltage drop linear voltage-stabilizing controller 89 can form low-voltage drop linear mu balanced circuit.In other words, the suitching type mu balanced circuit of the present embodiment and low-voltage drop linear mu balanced circuit have shared power level.
Selection circuit 88 comprise D type flip-flop 62, phase inverter 60, with door (ANDgate) 840, error amplifier (erroramplifier, error amplifier) 842 and transmission gate (transmissiongate, transmission gate) 843 and 844.The source electrode of P-type mos field effect transistor 845 is coupled to a power supply (VDD), its drain electrode is coupled to the source electrode of N-type mos field effect transistor 846, and the grounded drain of N-type mos field effect transistor 846 (Ground).
Receive inversion signal EN-SWR with the first input end of door 840, its second input end is then coupled to suitching type voltage-stabilizing controller 87, is then coupled to the grid of N-type mos field effect transistor 846 with the output terminal of door 840.Transmission lock 843,844 is coupled to each other, and the first end points of transmission lock 843 is coupled to the grid that suitching type voltage-stabilizing controller 87, second end points is then coupled to P-type mos field effect transistor 845.Transmission lock 843 and 844 signal is between the two negative inversion signal-EN-SWR.The input end of error amplifier 842 is coupled to low-voltage drop linear voltage-stabilizing controller 89, and the output terminal of error amplifier 842 is then coupled to the first end points of transmission lock 844.Second end points of transmission lock 844 is then coupled to the source electrode of P-type mos field effect transistor 845.
When inversion signal EN-SWR is high level (high), the output of suitching type voltage-stabilizing controller 87 just can by starting N-type mos field effect transistor 846 with door.In addition, another output of suitching type voltage-stabilizing controller 87 also can start P-type mos field effect transistor 845 by transmission lock 843.Now, output signal Output just produced by suitching type voltage-stabilizing controller 87 and as out-put supply, be provided to circuit under test 65.It can thus be appreciated that, when inversion signal EN-SWR is high level, the suitching type mu balanced circuit formed by P-type mos field effect transistor 845, N-type mos field effect transistor 846 and suitching type voltage-stabilizing controller 87 just can be activated.
When inversion signal EN-SWR is low level (low), the output of suitching type voltage-stabilizing controller 87 cannot by with door 840, but the output of low-voltage drop linear voltage-stabilizing controller 89 then can control P-type mos field effect transistor 845 and N-type mos field effect transistor 846.Now, output signal Output just produced by low-voltage drop linear voltage-stabilizing controller 89 and as out-put supply, be provided to circuit under test 65.It can thus be appreciated that, when inversion signal EN-SWR is low level, the low-voltage drop linear mu balanced circuit formed by P-type mos field effect transistor 845, N-type mos field effect transistor 846 and low-voltage drop linear voltage-stabilizing controller 89 just can be activated.
Fig. 9 illustrates the ninth embodiment of the present invention, and in the present embodiment, comparator circuit 93, except obtained the first survey electricity value by pin 651 except, is also obtained the second survey electricity value by pin 953, produces comparative result 632 by this.
The explanation of each embodiment is known from the above mentioned, the present invention utilizes the relevance between the impedance of passive device and the frequency of pulse signal, difference between the survey electricity value that the two-end-point calculating a circuit under test has, again this difference and a threshold value are compared, to obtain a comparative result, this comparative result just can point out whether circuit under test has a passive device.This technical characteristic also can be applicable in power circuit, is realized with various different circuit, thus, and the situation just can avoided the abnormal running of circuit, short circuit or burn.
The above embodiments are only used for exemplifying embodiments of the present invention, and explain technical characteristic of the present invention, are not used for limiting protection category of the present invention.Any those of ordinary skill in the art the arrangement of unlabored change or isotropism can all belong to the scope that the present invention advocates, the scope of the present invention should be as the criterion with right.
Claims (23)
1. a modulation determination device for power circuit, is coupled to a circuit under test, and described modulation determination device comprises:
One drive circuit, provides a pulse signal to one first end points of described circuit under test; And
One comparator circuit, described first end points being coupled to described circuit under test surveys electricity value to obtain one first, calculate described first to survey electricity value and one second and survey a difference between electric value, and described difference is exported a comparative result compared with a threshold value, wherein, described second survey electricity value is worth corresponding with the double-pointed electricity of surveying of described circuit under test;
Wherein, described comparative result indicates described circuit under test whether to have a passive device, to determine to modulate described power circuit, to supply an out-put supply with one first modulation system or one second modulation system.
2. modulation determination device according to claim 1, when described difference is greater than described threshold value, described comparative result indicates described circuit under test to have described passive device.
3. modulation determination device according to claim 1, when described difference is less than described threshold value, described comparative result indicates described circuit under test not have described passive device.
4. modulation determination device according to claim 1, wherein, described first surveys electricity value and described second surveys electric value for magnitude of voltage.
5. modulation determination device according to claim 1, wherein, described first surveys electricity value and described second surveys electric value for current value.
6. modulation determination device according to claim 1, wherein, described comparator circuit is also coupled to the second end points of described circuit under test, surveys electricity value to obtain described second from described second end points.
7. modulation determination device according to claim 1, wherein, described passive device is an inductor.
8. modulation determination device according to claim 1, wherein, described second survey electricity value is a built-in preset value.
9. a modulation determining method for power circuit, comprises the following step:
One first end points of one pulse signal to circuit under test is provided;
Detect described first end points and survey electricity value to obtain one first;
Obtain one second and survey electricity value, wherein, described second surveys electricity value is worth corresponding with the double-pointed electricity of surveying of described circuit under test;
Calculate described first to survey electricity value and described second and survey a difference between electric value;
By described difference generation one comparative result compared with a threshold value, described comparative result indicates described circuit under test whether to have a passive device; And
Described power circuit is modulated, to supply an out-put supply with one first modulation system or one second modulation system according to described comparative result.
10. modulation determining method according to claim 9, when described difference is greater than described threshold value, described comparative result indicates described circuit under test to have described passive device.
11. modulation determining methods according to claim 9, when described difference is less than described threshold value, described comparative result indicates described circuit under test not have described passive device.
12. modulation determining methods according to claim 9, wherein, described first surveys electricity value and described second surveys electric value for magnitude of voltage.
13. modulation determining methods according to claim 9, wherein, described first surveys electricity value and described second surveys electric value for current value.
14. modulation determining methods according to claim 9, wherein, described second survey electricity value obtains from one second end points of described circuit under test.
15. modulation determining methods according to claim 9, wherein, described passive device is an inductor or a capacitor.
16. 1 kinds of power circuits, comprise:
One first pin, is coupled to a circuit under test;
One drive circuit, couples described first pin, in order to provide a pulse signal to described circuit under test;
One comparator circuit, couple described first pin and survey electricity value to obtain one first, and survey the difference between electric value according to described first survey electricity value and one second, described difference and threshold value are compared to produce a comparative result, wherein, described second survey electricity value is worth corresponding with the double-pointed electricity of surveying of described circuit under test;
One suitching type mu balanced circuit;
One low-voltage drop linear mu balanced circuit; And
One selection circuit, determines to supply an out-put supply with described suitching type mu balanced circuit or described low-voltage drop linear mu balanced circuit according to described comparative result.
17. power circuits according to claim 16, wherein, described selection circuit comprises:
One D type flip-flop, couples described comparator circuit, exports a control signal according to described comparative result; And
One multiplexer, couples described suitching type mu balanced circuit, described low-voltage drop linear mu balanced circuit and described D type flip-flop, according to described control signal using the output of described suitching type mu balanced circuit or described low-voltage drop linear mu balanced circuit as described out-put supply.
18. power circuits according to claim 16, wherein, described selection circuit according to the enable described suitching type mu balanced circuit of described comparative result or described low-voltage drop linear mu balanced circuit, to supply described out-put supply.
19. power circuits according to claim 16, wherein, described suitching type mu balanced circuit and described low-voltage drop linear mu balanced circuit have shared power level.
20. power circuits according to claim 16, wherein, described selection circuit comprises:
One D type flip-flop, couples described comparator circuit, exports a control signal according to described comparative result;
One phase inverter, couples described D type flip-flop, and exports an inversion signal of described control signal; And
One enable circuits, couple described suitching type mu balanced circuit, described low-voltage drop linear controlling circuit of voltage regulation and described phase inverter, described inversion signal is received from described phase inverter, and according to the enable described suitching type mu balanced circuit of described inversion signal or described low-voltage drop linear mu balanced circuit, to supply described out-put supply.
21. power circuits according to claim 16, wherein, described first surveys electricity value and described second surveys electric value for magnitude of voltage.
22. power circuits according to claim 16, wherein, described first surveys electricity value and described second surveys electric value for current value.
23. power circuits according to claim 16, also comprise:
One second pin;
Wherein, described comparator circuit also couples described second pin, and obtains the described second survey electricity value of described second pin.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101107581A (en) * | 2005-01-25 | 2008-01-16 | 松下电器产业株式会社 | Power source system |
| CN101089768A (en) * | 2006-06-14 | 2007-12-19 | 半导体元件工业有限责任公司 | Circuit and method for regulating voltage |
| CN101304216A (en) * | 2007-05-11 | 2008-11-12 | 松下电器产业株式会社 | Switch control apparatus |
| TW200912591A (en) * | 2007-09-07 | 2009-03-16 | Realtek Semiconductor Corp | Calibration device and method for chip output current |
| CN101673938A (en) * | 2009-09-29 | 2010-03-17 | 杭州士兰微电子股份有限公司 | Output short-circuit soft-restoration control circuit and application thereof in DC-DC converter |
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| CN103308751A (en) | 2013-09-18 |
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