CN101242141A - Power supply device and voltage conversion method for efficient and low disperse information - Google Patents
Power supply device and voltage conversion method for efficient and low disperse information Download PDFInfo
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- CN101242141A CN101242141A CNA2007100062794A CN200710006279A CN101242141A CN 101242141 A CN101242141 A CN 101242141A CN A2007100062794 A CNA2007100062794 A CN A2007100062794A CN 200710006279 A CN200710006279 A CN 200710006279A CN 101242141 A CN101242141 A CN 101242141A
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Abstract
The invention provides a power supply installment with high efficiency and low noise and a method for transforming voltages, including: a switching type power supply circuit, which transforms an input voltage to a middle voltage; a low dropout voltage regulator circuit, which transforms the middle voltage to an output voltage to provide the load current to a load; and a feedback control circuit, which adjusts the noise filter capacity of the low dropout voltage regulator circuit, so that the noise filter capacity increases with the load current. The installment of the invention can carry on dynamic automatic control voltage transformation proportions between the two levels of circuits, causes the efficiency of the overall installment and the noise balance to be the best.
Description
Technical field
The present invention relates to the power supply device of a kind of high efficiency and low noise, be meant a kind of use switching power supply circuit (Switching Regulator) and low-pressure drop voltage-stabilizing circuit (LDO especially, Low Drop Out Regulator) power supply device that is constituted, and this device can dynamically be adjusted the voltage transitions ratio between two-stage circuit automatically, so that the efficient of single unit system and noise balance reach optimization.The present invention also proposes the method for the changing voltage of being correlated with in addition.
Background technology
Generally speaking, the switching power supply circuit is not wasted energy than tool efficient on voltage transitions; The output voltage of low-pressure drop voltage-stabilizing circuit then has lower ripple noise (ripple noise).Therefore, seeing also Fig. 1, is to propose a kind of power supply device that makes up both and constitute in the prior art, and it converts input voltage vin to intermediate voltage Vm earlier, converts output voltage V out again to.Purpose is by first order switching power supply circuit (SR) 10, in the hope of changing voltage expeditiously, again by second level low-pressure drop voltage-stabilizing circuit (LDO) 20, in the hope of filtering the ripple noise among the intermediate voltage Vm.Under this purpose, Vm is designed to Vout approachingly as much as possible in the prior art usually, so that from the voltage transitions of Vin to Vout, most ofly in the switching power supply circuit of the first order, finish, to improve conversion efficiency as far as possible.
Low-pressure drop voltage-stabilizing circuit is called power rejection rate (PowerSupply Rejection Ratio for the filter capacity of ripple noise, this specification hereafter PSRR), PSRR is relevant with three factors: power consumption stream (quiescent current) within the load current that inputs to output voltage drop value, output of low-pressure drop voltage-stabilizing circuit and the low-pressure drop voltage-stabilizing circuit.Voltage drop value is high more, and PSRR is good more; Load current is high more, and PSRR is poor more; The in-fighting electric current is high more, and PSRR is good more.Voltage drop value and in-fighting electric current will be unfavorable for voltage transitions efficient if raise but obviously.
In the prior art,, do any adaptive design not at the demand of load end.It considers very simple, only is the pressure drop between intermediate voltage Vm and output voltage V out is designed to alap definite value, and the output that also is about to first order switching power supply circuit is set at definite value.Though this kind design is simple, and have the advantage of high conversion efficiency, shortcoming to be, if load end is to noise when comparatively responsive, this kind prior art circuits can not satisfy the demand of load end.
In detail, see also Fig. 2, this is a conceptual schematic view, wherein abscissa is represented load current, that is the output current of power supply device, the ordinate typical measure, as seen from the figure, along with load current (output current) increases, the noise of intermediate voltage Vm can increase, but the PSRR of low-pressure drop voltage-stabilizing circuit can descend.Both multiplied result are shown in the 3rd schematic lines, and the whole noise of output voltage V out can increase and increase along with load current.
In view of this, dynamic control transformation efficient of a kind of energy and output noise obviously need be provided, and, reach the power supply device of balance therebetween according to the demand of load end.
Summary of the invention
In view of this, the present invention proposes a kind of power supply device promptly at the deficiency of above-mentioned prior art, solving aforementioned puzzlement, and reaches optimum balance between conversion efficiency and output noise.
The present invention's second purpose is to provide a kind of voltage conversion method that is applicable in the power supply device.
For reaching above-mentioned purpose, in one of them embodiment of the present invention, provide the power supply device of a kind of high efficiency and low noise, comprise: a suitching type power supply circuit, it is converted to an intermediate voltage with an input voltage; One low-pressure drop voltage-stabilizing circuit, it is converted to an output voltage with this intermediate voltage, to provide load current to a load; And feedback control circuit, the noise filter capacity that it adjusts this low-pressure drop voltage-stabilizing circuit makes it increase with this load current.
In the foregoing description, when this load current increased, this feedback control circuit can improve the pressure drop between intermediate voltage and output voltage, or improved power consumption stream within this low-pressure drop voltage-stabilizing circuit.
In addition, according to another embodiment of the invention, provide a kind of method of changing voltage, comprise following steps: a suitching type power supply circuit (A) is provided, and it is converted to an intermediate voltage with an input voltage; (B) provide a low-pressure drop voltage-stabilizing circuit, it is converted to an output voltage with this intermediate voltage, gives a load with the supply load current; And the noise filter capacity of (C) adjusting this low-pressure drop voltage-stabilizing circuit, it is increased with this load current.
In the said method, noise filter capacity signal related with this low-pressure drop voltage-stabilizing circuit can be: the output voltage signal of error amplifier or the abnormal signal of load current signal or load in the grid voltage signal of output stage transistor or door source voltage signal or door drain voltage signal or this low-pressure drop voltage-stabilizing circuit in this low-pressure drop voltage-stabilizing circuit.
Below will be by specific embodiment be illustrated in detail, when the purpose that is easier to understand the present invention, technology contents, characteristics and the effect reached thereof.
Description of drawings
Fig. 1 is the schematic circuit diagram of the power supply device of prior art.
The shortcoming of Fig. 2 illustrative prior art.
Fig. 3 A-3C is in order to explanation the present invention's principle.
Fig. 4 is a schematic circuit diagram, and one of them embodiment of power supply device of the present invention is shown.
Fig. 5 A and Fig. 5 B illustrate and how to utilize modulation signal MOD to control the switching power supply circuit.
Fig. 6,7,8 explanation feedback control circuits than specific embodiment, it is corresponding to the low-pressure drop voltage-stabilizing circuit that uses PMOS as output stage transistor.
Element alternative among Fig. 9 A and Fig. 9 B key diagram 6,7,8 embodiment.
Figure 10 and Figure 11 illustrate two specific embodiments in addition of feedback control circuit, and it is corresponding to the low-pressure drop voltage-stabilizing circuit that uses NMOS as output stage transistor.
Figure 12 is a schematic circuit diagram, and another embodiment again of power supply device of the present invention is shown.
Figure 13 illustrates explanation and how to utilize modulation signal MOD to control the in-fighting electric current of low-pressure drop voltage-stabilizing circuit.
Figure 14 A and Figure 14 B illustrate the practice of carrying out feedback generation modulation signal MOD from load circuit.
Figure 15 A and Figure 15 B are schematic circuit diagram, and another embodiment again of power supply device of the present invention is shown.
Symbol description among the figure
10 switching power supply circuit
15 voltages add way circuit
16 voltage subtraction circuits
20 low-pressure drop voltage-stabilizing circuits
30 feedback control circuits
33 current mirrors
42 bit error rates (Bit Error Rate, BER) counter
44 digital analog converters
50 loads
EA10, the EA20 error amplifier
Feedback voltage in the FB switching power supply circuit
The GM transduction circuit
MOD modulation signal
The digital modulation signal of MOD '
Q21, Q22, Q31, Q32, Q33, Q34, Q35 transistor
R21, R22, R31, R32, R41 resistance
The Vin input voltage
The Vm intermediate voltage
The Vout output voltage
Vref10, the Vref20 reference voltage
Embodiment
At first notion of the present invention is described from principle.Please refer to Fig. 3 A-3C, key diagram 3A at first, one of basic conception of the present invention is: when load current increases, the PSRR of low-pressure drop voltage-stabilizing circuit accordingly raises, remain in the load end acceptable scope will export noise that (icon is the notion signal, and all schematic lines must not be straight line; The whole noise of output voltage V out does not need to be definite value).Reach Fig. 3 A result's mode, for example can shown in Fig. 3 B, the voltage drop value of low-pressure drop voltage-stabilizing circuit be increased with load current, or can be shown in Fig. 3 C, the in-fighting electric current I cc of low-pressure drop voltage-stabilizing circuit is increased with load current, but also both and usefulness certainly, or adopt alternate manner.
Please refer to Fig. 4, wherein the mode with schematic circuit diagram shows one of them embodiment of the present invention.As shown in the figure, in the present embodiment, provide a feedback control circuit 30, (icon is signal, is connected so only draw with inside according to the inside of low-pressure drop voltage-stabilizing circuit 20 or outside signal; Please contrast and consult figure 14A and Figure 14 B), feedback generation modulation signal MOD sets with the output of adjusting first order switching power supply circuit 10.With regard to switching power supply circuit 10, the method for adjusting its output setting for example is: adjust the input of its interior error amplifier EA10, shown in Fig. 5 A and 5B; Certainly also can make otherwise and adjust, for example adjust input off-set voltage (Input Offset Voltage) of EA10 or the like.The detailed structure of switching power supply circuit is known by being familiar with present technique person, under the announcement and instruction of notion of the present invention, be familiar with present technique person when can be according to spirit of the present invention, think of and various according to modulation signal MOD, adjust the method for the output setting of switching power supply circuit 10, all should belong to scope of the present invention.Emphasis is, according to modulation signal MOD, adjust the output of switching power supply circuit 10, intermediate voltage Vm is changed in response to modulation signal MOD, also adjust the voltage drop value of second level low-pressure drop voltage-stabilizing circuit 20 accordingly, and and then adjusted the PSRR of low-pressure drop voltage-stabilizing circuit 20.
In Fig. 5 A and Fig. 5 B, with two voltage additions or subtract each other the circuit 15,16 of back output, there is several different methods to reach, this is known by being familiar with present technique person, at this detailed description one by one.For example, can earlier two voltages be converted to electric current individually, with current summation or after subtracting each other, again this current conversion be become voltage, this voltage is two voltage sums/poor.
First embodiment of feedback control circuit 30 can consult Fig. 6, and the low-pressure drop voltage-stabilizing circuit 20 of left is with the typical low-pressure drop voltage-stabilizing circuit of PMOS as output stage transistor among the figure, and it is right-hand to be feedback control circuit 30 of the present invention.By to resistance R 21, R22, R31, the resistance of R32, and the matching Design of transistor Q21 and transistor Q31 can make electric current I 1 much larger than electric current I 2, so the power consumption of feedback control circuit 30 own is little.The gate-source voltage that makes transistor Q21 is Vgs21, the gate-source voltage of transistor Q31 is Vgs31, the electric current I 2 that then flows through transistor Q31 equals (Vgs21-Vgs31)/R31, and because this electric current is very little, so Vgs31 approximates the conduction threshold Vth31 of transistor Q31, therefore electric current I 2 approximates (Vgs21-Vth31)/R31, and the magnitude of voltage of modulation signal MOD (being the aanalogvoltage signal in this example) promptly equals
R32＊I2＝R32(Vgs21-Vth31)/R31
Vth31, R31, R32 are all definite value, so modulation signal MOD only is the function of Vgs21, also are the function (Iout ≈ I1) of load current Iout.
Second embodiment of feedback control circuit 30 can consult Fig. 7, and present embodiment and precedent difference are that it only is the function of the grid leak pole tension Vgd21 of transistor Q21 that present embodiment makes modulation signal MOD.Identical with precedent, because electric current I 2 is very little, so Vgs31 approximates the conduction threshold Vth31 of PMOS transistor Q31, and Vgs32 approximates the conduction threshold Vth32 of nmos pass transistor Q32.The grid of PMOS transistor Q31 is connected with the drain electrode of transistor Q21, so electric current I 2 approximates (Vgd21-Vth31-Vth32)/R31, and the magnitude of voltage of modulation signal MOD (being the aanalogvoltage signal in this example) promptly equals
R32＊I2＝R32(Vgd21-Vth31-Vth32)/R31
Vth31, Vth32, R31, R32 are all definite value, so modulation signal MOD only is the function of Vgd21.
The 3rd embodiment of feedback control circuit 30 can consult Fig. 8, and modulation signal MOD ' is a digital signal in this enforcement.The application mode of numeral modulation signal MOD ' illustrates as follows: for example, load end may only have two kinds of operator schemes, then intermediate voltage Vm only need conversion between two kinds of magnitudes of voltage, therefore do not need continually varying simulation modulation signal MOD, and only need the digital modulation signal MOD ' on two rank; This time modulation signal MOD ' is not used in the mode shown in 5A and the 5B figure, but otherwise controls switching power supply circuit 10, to adjust intermediate voltage Vm.
In the present embodiment, when the transfer point of the accurate position of MOD output, I2=Ib is so the cross-pressure on the resistance R 31 equals Ib*R31.Normally act on as current mirror 33, expression nmos pass transistor Q32 and all conductings of nmos pass transistor Q33, that is the grid voltage Vg21 of transistor Q21 (that is output of error amplifier EA20) equals (Vth32+Ib*R31+Vth33), this moment is if improve Vg21 slightly, because nmos pass transistor Q34 conducting electric current increases, so modulation signal MOD ' is in low level.Relatively, less than (Vth32+Ib*R31+Vth33), then nmos pass transistor Q34 conducting electric current is less than Ib as if Vg21, and the voltage of modulation signal MOD ' rises and is in high levels.Because of Vth32, Ib, R31, Vth33 are all definite value, so the high low level of modulation signal MOD ' is interdependent with the grid voltage Vg21 of transistor Q21:
MOD '=H is as Vg21＜(Vth32+Ib*R31+Vth33)
MOD '=L is as Vg21＞(Vth32+Ib*R31+Vth33)
More than source electrode following device (transistor Q31, the Fig. 7 among Fig. 6, the transistor Q32 among Fig. 8) in the three embodiment circuit, the circuit of available Fig. 9 A or Fig. 9 B replaces, so more can make transistorized conduction threshold is 0, conveniently sets up more simple functional relation; G among the figure, S, D replace grid, source electrode, the drain electrode of script transistor Q31 or transistor Q32 respectively, can supply and corresponding node connection.
In addition, more than among three embodiment, the output stage transistor of low-pressure drop voltage-stabilizing circuit 20 is the PMOS transistor, but certainly, if the output stage transistor of low-pressure drop voltage-stabilizing circuit 20 is a nmos pass transistor, the present invention is feasible too; Specific embodiment such as Figure 10, Figure 11.Figure 10 is similar to Fig. 7, but output stage transistor is nmos pass transistor Q22, and its gate-source voltage is Vgs22.In the present embodiment, modulation signal MOD is the aanalogvoltage signal, and its magnitude of voltage equals R32*I2=R32 (Vgs22-Vth31-Vth32)/R31.Figure 11 is similar to Fig. 8, but output stage transistor is nmos pass transistor Q22, and nmos pass transistor Q32 changes PMOS transistor Q35 into.In the present embodiment, modulation signal MOD ' is a digital signal, when current mirror 33 is normally done the time spent, expression transistor Q35 and all conductings of Q33, and when the pressure reduction (Vpp-Vg22) between supply voltage Vpp and transistor Q22 grid voltage Vg22 during greater than (Vth35+Ib*R31), nmos pass transistor Q34 conducting electric current is greater than Ib, so modulation signal MOD ' is in low level.Relatively, if (Vpp-Vg22) less than (Vth35+Ib*R31), then nmos pass transistor Q34 conducting electric current is less than Ib, and the voltage of modulation signal MOD ' rises and is in high levels.Because of Vpp, Vth35, Ib, R31 are all definite value, so the high low level of modulation signal MOD ' is interdependent with the grid voltage Vg22 of transistor Q22:
MOD '=H is as Vg22＞Vpp-(Vth35+Ib*R31)
MOD '=L is as Vg22＜Vpp-(Vth35+Ib*R31)
Offer the supply voltage Vpp of error amplifier EA20 among Figure 10, Figure 11, can directly use input voltage vin, or use other voltage higher than Vm.
Among Fig. 4 and Fig. 5 A, the 5B, the output of modulation signal MOD FEEDBACK CONTROL first order switching power supply circuit 10 is set, to adjust intermediate voltage Vm.According to Fig. 3 C, under notion of the present invention, but the also in-fighting electric current of FEEDBACK CONTROL low-pressure drop voltage-stabilizing circuit 20, as shown in figure 12.Its specific embodiment, act one is Figure 13 for example, and in the present embodiment, the power consumption of error amplifier EA20 is represented with the electric current I cs on the path 100, and this electric current is definite value Ic not having under other circuit control originally.According to the present invention, can use transduction circuit (transconductance) GM, utilize modulation signal MOD to produce electric current I 3, its current value equals the magnitude of voltage of modulation signal MOD divided by resistance R 41.And electric current I cs promptly equals definite value Ic and (MOD/R41) sum, in other words, can increase electric current I cs by the magnitude of voltage of rising MOD, and electric current I cs is the main part of low-pressure drop voltage-stabilizing circuit 20 in-fighting electric currents.
In the various embodiments described above, its modulation signal MOD takes from low-pressure drop voltage-stabilizing circuit 20, but the present invention is not limited thereto, also can be from load end feedback generation modulation signal MOD.Because of load end may be various circuit, so can not state to the greatest extent one by one, the practice is only lifted two for example Figure 14 A and Figure 14 B, supposes load end to ripple noise sensitivity, because of the ripple noise has the concussion characteristic, so may cause and have a rest sexual abnormality between the load end and produce certain bit error rate (Bit Error Rate, BER), can and export its bit error rate this moment by bit error rate counter 42 statistics, again by digital analog converter 44, be converted into the aanalogvoltage signal, can be provided as modulation signal MOD; Certainly, also can pass through logical circuit, produce digital modulation signal MOD '.Be familiar with present technique person and disclose under the instruction,, do not describe in detail one by one, but all should belong to the present invention's interest field at this when designing the method for various feedback generation modulation signal MOD or modulation signal MOD ' according to the circuit characteristic of load end in this case.
Except that the above, shown in Figure 15 A and Figure 15 B, direct detecting current signal, and produce modulation signal MOD (or modulation signal MOD ') according to this, and also being fine certainly, its detailed practice is superfluous in addition to be shown.
Below at preferred embodiment the present invention is described, only the above only is familiar with present technique person and is easy to understand content of the present invention for making, and is not the interest field that is used for limiting the present invention.As previously mentioned, for being familiar with present technique person, when can in spirit of the present invention, thinking immediately and various equivalence variation.For example, direct-connected two elements shown in all embodiment can insert the circuit that does not influence the signal meaning, for example delay circuit, switching circuit or the like betwixt.For another example, first order switching power supply circuit 10 is not defined as step-down, boosts or the back-pressure circuit.And for example, among all embodiment, all be the voltage Vout that the hypothesis load end need be fixed, but if load end needs variable voltage Vout, then also can adjust the voltage transitions ratio of first order switching power supply circuit 10 and/or second level low-pressure drop voltage-stabilizing circuit 20 by numeral or analog feedback controlling mechanism, for example adjust the input etc. of error amplifier EA10 and/or error amplifier EA20 by feedback signal, this also belongs to the present invention's notion.All notions according to the present invention of will dying and spirit institute be impartial for it to change or modifies, and all should be included in the present invention's the claim.
Claims (16)
1. the power supply device of a high efficiency and low noise comprises:
One suitching type power supply circuit, it is converted to an intermediate voltage with an input voltage;
One low-pressure drop voltage-stabilizing circuit, it is converted to an output voltage with this intermediate voltage, to provide load current to a load; And
Feedback control circuit, the noise filter capacity that it adjusts this low-pressure drop voltage-stabilizing circuit makes it increase with this load current.
2. the power supply device of high efficiency as claimed in claim 1 and low noise, wherein when this load current increased, this feedback control circuit improved the pressure drop between intermediate voltage and output voltage.
3. the power supply device of high efficiency as claimed in claim 2 and low noise wherein has an error amplifier in this switching power supply circuit, and this feedback control circuit exports a signal, to adjust an input of this error amplifier.
4. the power supply device of high efficiency as claimed in claim 1 and low noise, wherein when this load current increased, this feedback control circuit improved power consumption stream within this low-pressure drop voltage-stabilizing circuit.
5. the power supply device of high efficiency as claimed in claim 4 and low noise wherein has an error amplifier in this low-pressure drop voltage-stabilizing circuit, and this feedback control circuit exports a signal, to adjust the current sinking of this error amplifier.
6. the power supply device of high efficiency as claimed in claim 1 and low noise, wherein this feedback control circuit extracts signal within this low-pressure drop voltage-stabilizing circuit, and produces the modulation signal, to adjust the noise filter capacity of this low-pressure drop voltage-stabilizing circuit.
7. the power supply device of high efficiency as claimed in claim 6 and low noise, wherein this low-pressure drop voltage-stabilizing circuit comprises an error amplifier and an output stage transistor, the grid of this output stage transistor of the output of this error amplifier control, and wherein this feedback control circuit extracts signal from the grid of this output stage transistor or drain electrode or source electrode or with take up an official post both or above three.
8. the power supply device of high efficiency as claimed in claim 1 and low noise, wherein this feedback control circuit extracts signal from this load, and produces the modulation signal, to adjust the noise filter capacity of this low-pressure drop voltage-stabilizing circuit.
9. the power supply device of high efficiency as claimed in claim 8 and low noise, wherein this feedback control circuit has a bit error rate counter, is electrically connected with load and produces the bit error rate signal.
10. the method for a changing voltage comprises following steps:
One suitching type power supply circuit is provided, and it is converted to an intermediate voltage with an input voltage;
One low-pressure drop voltage-stabilizing circuit is provided, and it is converted to an output voltage with this intermediate voltage, gives a load with the supply load current; And
Adjust the noise filter capacity of this low-pressure drop voltage-stabilizing circuit, it is increased with this load current.
11. the method for changing voltage as claimed in claim 10, wherein this noise filter capacity is represented with the power rejection rate of this low-pressure drop voltage-stabilizing circuit.
12. the method for changing voltage as claimed in claim 10, wherein this step (C) comprises: make the voltage drop value or the in-fighting electric current of this low-pressure drop voltage-stabilizing circuit, increase with this load current.
13. the method for changing voltage as claimed in claim 10, wherein this step (C) comprises:
(C1) the noise filter capacity signal related of extraction and this low-pressure drop voltage-stabilizing circuit;
(C2) produce the modulation signal; And
(C3) this modulation signal is imported this switching power supply circuit, with adjust its output among between voltage.
14. the method for changing voltage as claimed in claim 10, wherein this step (C) comprises:
(C1) the noise filter capacity signal related of extraction and this low-pressure drop voltage-stabilizing circuit;
(C2) produce the modulation signal; And
(C3) this modulation signal is imported this low-pressure drop voltage-stabilizing circuit, to adjust its in-fighting electric current.
15. the method for changing voltage as claimed in claim 13, wherein this low-pressure drop voltage-stabilizing circuit comprises an error amplifier and an output stage transistor, the grid of this output stage transistor of the output of this error amplifier control, and wherein the signal in this step (C1) be the grid voltage signal of this output stage transistor or output voltage signal or the load current signal or the load abnormal signal of door source voltage signal or a drain voltage signal or this error amplifier.
16. the method for changing voltage as claimed in claim 14, wherein this low-pressure drop voltage-stabilizing circuit comprises an error amplifier and an output stage transistor, the grid of this output stage transistor of the output of this error amplifier control, and wherein the signal in this step (C1) be the grid voltage signal of this output stage transistor or output voltage signal or the load current signal or the load abnormal signal of door source voltage signal or a drain voltage signal or this error amplifier.
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| CNA2007100062794A CN101242141A (en) | 2007-02-07 | 2007-02-07 | Power supply device and voltage conversion method for efficient and low disperse information |
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| CN101676827B (en) * | 2008-09-16 | 2011-10-26 | 凹凸电子（武汉）有限公司 | Method for converting an input voltage to an output voltage, power regulator and electronic system |
| CN102591400A (en) * | 2011-01-12 | 2012-07-18 | 深圳艾科创新微电子有限公司 | Low-dropout regulator and method of improving power supply rejection of LDO (low-dropout regulator) |
| CN102645944A (en) * | 2011-02-16 | 2012-08-22 | 联发科技（新加坡）私人有限公司 | Regulator providing various output voltages |
| CN105388956A (en) * | 2015-11-13 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Dynamic adjustment method and system for load current and electronic equipment |
| CN106249795A (en) * | 2016-08-31 | 2016-12-21 | 电子科技大学 | A kind of LDO circuit of output of floating |
| WO2017107193A1 (en) * | 2015-12-25 | 2017-06-29 | 华为技术有限公司 | Low dropout regulator and voltage regulation method |
| CN110417288A (en) * | 2019-08-06 | 2019-11-05 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
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| CN101676827B (en) * | 2008-09-16 | 2011-10-26 | 凹凸电子（武汉）有限公司 | Method for converting an input voltage to an output voltage, power regulator and electronic system |
| CN102591400A (en) * | 2011-01-12 | 2012-07-18 | 深圳艾科创新微电子有限公司 | Low-dropout regulator and method of improving power supply rejection of LDO (low-dropout regulator) |
| CN102645944A (en) * | 2011-02-16 | 2012-08-22 | 联发科技（新加坡）私人有限公司 | Regulator providing various output voltages |
| US8878513B2 (en) | 2011-02-16 | 2014-11-04 | Mediatek Singapore Pte. Ltd. | Regulator providing multiple output voltages with different voltage levels |
| CN102645944B (en) * | 2011-02-16 | 2014-12-03 | 联发科技（新加坡）私人有限公司 | Regulator providing various output voltages |
| CN105388956A (en) * | 2015-11-13 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | Dynamic adjustment method and system for load current and electronic equipment |
| WO2017107193A1 (en) * | 2015-12-25 | 2017-06-29 | 华为技术有限公司 | Low dropout regulator and voltage regulation method |
| CN106249795A (en) * | 2016-08-31 | 2016-12-21 | 电子科技大学 | A kind of LDO circuit of output of floating |
| CN112311332A (en) * | 2019-08-02 | 2021-02-02 | 立锜科技股份有限公司 | Signal amplifying circuit with high power supply rejection ratio and driving circuit therein |
| CN112311332B (en) * | 2019-08-02 | 2024-05-03 | 立锜科技股份有限公司 | Signal amplifying circuit with high power supply rejection ratio and driving circuit therein |
| CN110417288A (en) * | 2019-08-06 | 2019-11-05 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
| CN110417288B (en) * | 2019-08-06 | 2021-01-15 | 珠海格力电器股份有限公司 | Novel switching power supply driving circuit and control method thereof |
| CN113589876A (en) * | 2021-08-23 | 2021-11-02 | 深圳昂瑞微电子技术有限公司 | Power control circuit |
| CN113589876B (en) * | 2021-08-23 | 2023-12-15 | 深圳昂瑞微电子技术有限公司 | Power control circuit |
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Open date: 20080813 |