CN102457185A - Multiphase changing-over type power supply unit as well as drive circuit and control method thereof - Google Patents
Multiphase changing-over type power supply unit as well as drive circuit and control method thereof Download PDFInfo
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Abstract
The invention provides a multiphase changing-over type power supply unit as well as a drive circuit and a control method thereof. The multiphase changing-over type power supply unit comprises at least two power levels, a feedback circuit, and a current balance circuit and a slow stop control circuit, wherein at least two power levels respectively switch a power transistor to convert input voltage into output voltage according to corresponding pulse width modulation (PWM); the feedback circuit generates a feedback signal according to the output voltage; the current balance circuit generates a current balance signal to equally distribute electric current of each power level according to electric current in each related power level power level and a phase off signal; and the slow stop control circuit generates a slow stop control signal according to the phase off signal, changes a PWM signal in a progressive manner so as to gradually close the corresponding power level, thereby avoiding to cause voltage dip.
Description
Technical field
The present invention relates to a kind of heterogeneous switched power supply and drive circuit and control method, be meant a kind of heterogeneous switched power supply and drive circuit and control method of closing the power stage that to close with progressive mode especially.
Background technology
Fig. 1 shows the heterogeneous switched power supply circuit diagram of prior art; The first phase PWM (pulse width modulation wherein; PWM) controller 11 with second mutually PWM controller 21 export PWM1 and PWM2 signal respectively; To control the first phase power stage 12 and second at least one power transistor in the power stage 22 mutually, to convert input voltage vin into output voltage V out jointly.Feedback circuit 13 produces the back coupling signal relevant with output voltage V out and this back coupling signal is imported the first phase PWM controller 11 and the second phase PWM controller 21 respectively.In addition; Flow equalizing circuit (current balance circuit) 14 receives first signal and second signal relevant with the first output current I1 and the second output current I2; Output current-sharing signal is imported the first phase power stage 12 and second power stage 22 mutually; Make the first phase PWM controller 11 with second mutually PWM controller 21 can control the first phase power stage 12 and the second phase power stage 22 respectively, with mean allocation electric current I 1 and I2, and then make output current Iout reach the target of setting. Power stage 12 and 22 can be but is not limited to synchronous or asynchronous voltage-dropping type, booster type, back-pressure type or buck-boost type change-over circuit, shown in Fig. 2 A-2J.
When load is underloading, does not need all power stages to come supplying electric current to give load, and can close at least one power stage, to reduce the operational losses of circuit.Therefore, when this needed, heterogeneous switched power supply received and subtracts phase signal (phase Off signal); And the power stage that needs are closed, such as but not limited to the second phase power stage 22 among Fig. 1 is closed, at this moment; Subtract the phase signal and import the second phase PWM controller 21, directly the work ratio of PWM2 signal is reduced to zero, to close the second phase power stage 22; Yet the output current I1 of the first phase power stage 12 need one period buffer time reach needed load current.In this process, often cause the bust of output voltage, in system, throw into question easily.
Patent Application No. discloses a kind of heterogeneous switched power supply No. 2008/0272752, can keep under the situation of output voltage the power stage in the shutoff operation; But the application of this patent; The power stage that must have three-phase at least, this prior art must be added to the pairing PWM signal of other power stage of desiring to turn off in the PWM signal of first phase in addition, so it can't avoid keeping in the power stage of phase; The restriction of inductive current slope, output voltage still have the phenomenon of bust.
In view of this, the present invention promptly to the deficiency of above-mentioned prior art, proposes a kind of heterogeneous switched power supply and drive circuit and control method of closing the power stage that subtracts phase with progressive mode.
Summary of the invention
One of the object of the invention is to overcome the deficiency and the defective of prior art, proposes a kind of heterogeneous switched power supply of closing the power stage that subtracts phase with progressive mode.
Another object of the present invention is to, propose a kind of drive circuit of heterogeneous switched power supply.
Another purpose of the present invention is, proposes a kind of control method of heterogeneous switched power supply.
For reaching above-mentioned purpose; With regard to one of them viewpoint speech, the invention provides a kind of heterogeneous switched power supply, comprise: the first phase power stage; According to one first phase PWM signal, switch at least one power transistor to control first output current of the first phase power stage; At least one second phase power stage; According at least one second phase PWM signal; Switch respectively in the second corresponding phase power stage at least one power transistor with control flows respectively through at least one second output current of the second phase power stage of correspondence, with this first mutually power stage convert input voltage into output voltage jointly; Feedback circuit produces a back coupling signal according to this output voltage; Flow equalizing circuit, according to one be relevant to first signal of this first output current, at least one second signal and that is relevant to this second output current subtracts the phase signal, produces a current-sharing signal, wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal; The first phase PWM controller producing this first phase PWM signal, and is adjusted this first phase PWM signal according to this current-sharing signal according to this back coupling signal; At least one second phase PWM controller producing corresponding at least one second phase PWM signal, and is adjusted corresponding at least one second phase PWM signal according to this current-sharing signal according to this back coupling signal; And the slow control circuit that ends, according to subtracting the phase signal, producing a slow controlling signal of ending, this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
With regard to another viewpoint speech; The invention provides a kind of heterogeneous switched power supply drive circuit; This heterogeneous switched power supply is according to one first phase PWM signal, with at least one second PWM signal mutually, switch respectively the first phase power stage with at least one second mutually in the power stage at least one power transistor to produce first output current and second output current; Convert input voltage into output voltage jointly; And according to this output voltage generation one back coupling signal, this heterogeneous switched power supply drive circuit comprises: flow equalizing circuit subtracts the phase signal according to first output current, second output current and; Produce a current-sharing signal, wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal; The first phase PWM controller producing this first phase PWM signal, and is adjusted this first phase PWM signal according to this current-sharing signal according to this back coupling signal; At least one second phase PWM controller producing at least one second phase PWM signal of this correspondence, and is adjusted this at least one second phase PWM signal according to this current-sharing signal according to this back coupling signal; And the slow control circuit that ends, according to subtracting the phase signal, producing a slow controlling signal of ending, this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
In above-mentioned heterogeneous switched power supply or the heterogeneous switched power supply drive circuit, should comprise in each second phase PWM controller: the slope signal generating circuit, it produces a slope signal; Comparator, its according to slope signal, current-sharing signal, slowly end controlling signal, and feedback signal, and produce the second phase PWM signal.In a kind of enforcement kenel, this is slow to end controlling signal and is cumulative or signal decrescence in time, so that the work of this second phase PWM signal is more zero than being reduced to gradually.
In a kind of enforcement kenel; Comprise a upper current limit protective circuit in each second phase PWM controller; Second signal that it is relatively more corresponding and upper current limit protection reference signal; To produce the work ratio of power transistor in this second phase power stage of output control, make the second corresponding output current be no more than preset upper current limit value; Wherein, This upper current limit protective circuit receives should slowly end controlling signal as its upper current limit protection reference signal; And should slow end controlling signal and be signal decrescence, the upper limit of second output current of correspondence was reduced to zero gradually so that second output current that should correspondence is reduced to zero gradually.
Just another viewpoint is sayed again; The invention provides a kind of heterogeneous switched power supply control method; This heterogeneous switched power supply is according to one first phase PWM signal; With at least one second PWM signal mutually, switch respectively the first phase power stage with at least one second mutually in the power stage at least one power transistor convert input voltage into output voltage jointly to produce first output current and second output current; And according to this output voltage generation one back coupling signal; This heterogeneous switched power supply control method comprises: subtract the phase signal according to first output current, second output current and, produce a current-sharing signal, wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal; Producing this first phase PWM signal, and adjust this first phase PWM signal according to this back coupling signal according to this current-sharing signal; Producing at least one second phase PWM signal of this correspondence, and adjust this at least one second phase PWM signal according to this back coupling signal according to this current-sharing signal; And according to subtracting the phase signal, produce a slow controlling signal of ending, and this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
In the said method, this is slow to end controlling signal and can be cumulative or signal decrescence, and can or decrescence slow end controlling signal cumulative according to this, comes the work ratio of progressive reduction by the second phase PWM signal; Or this slow controlling signal of ending can be decrescence signal, and can limit the upper limit of the second phase output current according to this slow controlling signal of ending decrescence.
Explain in detail through specific embodiment below, when the effect that is easier to understand the object of the invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 shows the heterogeneous switched power supply circuit diagram of prior art;
Fig. 2 A-2J marks synchronous or asynchronous voltage-dropping type, booster type, back-pressure type or buck-boost type adjuster;
Fig. 3 shows an embodiment of basic framework of the present invention;
Fig. 4 A-4B shows the power stage output current of prior art and the waveform sketch map of output voltage;
Fig. 4 C-4D shows the power stage output current of the embodiment of the invention and the waveform sketch map of output voltage;
Fig. 4 E shows the waveform sketch map that subtracts the phase signal;
Fig. 5 shows the slow more specifically embodiment that controlling signal reduces the work ratio of the second phase PWM signal PWM2 gradually that ends;
Fig. 6 gives an example and slowly among displayed map 5 embodiment ends the slow controlling signal of ending that control circuit 15 is produced;
Fig. 7 shows slow another embodiment more specifically that ends work ratio that controlling signal reduces by the second phase PWM signal PWM2 gradually;
Fig. 8 gives an example and slowly among displayed map 7 embodiment ends the slow controlling signal of ending that control circuit 15 is produced;
Fig. 9 shows an embodiment of basic framework of the present invention.
Symbol description among the figure
11 first phase PWM controllers
111 first slope signal generating circuits
112 add way circuit
113 first comparators
12 first phase power stages
13 feedback circuits
14 flow equalizing circuits
The 15 slow control circuits that end
21 second phase PWM controllers
211 second slope signal generating circuits
212 add way circuit
213 second comparators
215 upper current limit protective circuits
22 second phase power stages
I1 first output current
I2 second output current
The Iout output current
The PWM1 first phase PWM signal
The PWM2 second phase PWM signal
The REFoc reference signal
The Vin input voltage
The Vout output voltage
Embodiment
Basic fundamental thought of the present invention is when the load of heterogeneous switched power supply is relative underloading; Just do not need all different power levels all during conducting; According to subtracting the phase signal, control PWM signal is closed the power stage that need close with progressive mode; Avoid causing the bust of output voltage, and then influence system's normal running.
See also Fig. 3, show an embodiment of basic framework of the present invention.Heterogeneous switched power supply and prior art as shown in the figure are compared; Present embodiment provides the slow control circuit (softshutdown control circuit) 15 that ends; With second mutually PWM controller 21 couple; Slow only control circuit 15 receives and subtracts the phase signal, and subtracts the slow only controlling signal of news generation mutually according to this; The second phase PWM controller 21 produces the second phase PWM signal PWM2 according to the back coupling signal, and according to the slow controlling signal of ending, directly or indirectly reduces the work ratio of the second phase PWM signal PWM2 gradually, and is extremely zero in order to the output current I2 that progressively reduces by the second phase power stage 22.Wherein, this slow only controlling signal reduces the details of the work ratio of the second phase PWM signal PWM2 gradually, will detail in the back literary composition.
Fig. 4 A-4E contrast shows the difference of the present invention and prior art; Wherein Fig. 4 A-4B shows the power stage output current of prior art and the waveform sketch map of output voltage; Fig. 4 C-4D shows the power stage output current of the embodiment of the invention and the waveform sketch map of output voltage, and Fig. 4 E is then for subtracting the waveform sketch map of phase signal.See also Fig. 4 A-4B and the prior art of consulting Fig. 1 simultaneously, wherein the first phase power stage 12 with second mutually power stage 22 for example be the synchronous buck type switched power supply shown in Fig. 2 A.When time t1, subtract the phase signal and produce the signal that the second phase power stage 22 is closed, see also Fig. 4 A; This moment the second phase power stage 22 directly close, output current I2 stop supplies immediately, though and the first phase power stage 12 increases the work ratio; But because the loop needs the reaction time; Therefore the output current I1 of the first phase power stage 12 can't catch up with required output current at once, and causes as among Fig. 4 B the bust of output voltage V out.
Then see also Fig. 4 C-4D, please consult Fig. 3 embodiments of the invention simultaneously, wherein the first phase power stage 12 with second mutually power stage 22 for example also be the synchronous buck type switched power supply shown in Fig. 2 A.When time t1; Subtract the phase signal and produce the signal that the second phase power stage 22 is closed, as shown in Figure 3, subtract the slow control circuit 15 that ends of phase signal input; Slow slow controlling signal to the second phase PWM controller 21 that ends of control circuit 15 outputs that ends; Be not directly to close the second phase PWM signal PWM2 that the second phase PWM controller 21 is produced, but, the second phase PWM signal PWM2 closed gradually (that is reducing its work gradually) with progressive mode than extremely zero.See also Fig. 4 C, when t1, the output current I2 in the second phase power stage 22 is according to the slow controlling signal of ending; Beginning reduces gradually; The output current I1 of the first phase power stage 12 then catch up with required output current gradually, and Fig. 4 D is consulted in contrast, and therefore output voltage V out does not have the phenomenon of bust.
Fig. 5 illustrates the slow more specifically embodiment that controlling signal reduces the work ratio of the second phase PWM signal PWM2 gradually that ends.As shown in Figure 5; The first phase PWM controller 11 comprises the first slope signal generating circuit 111, produces first slope signal Ramp1 input and adds way circuit 112, adds the current-sharing signal that way circuit 112 totallings, first slope signal Ramp1 and flow equalizing circuit 14 are produced; Produce first and add overall result; Add overall result with first and import first comparator, 113, the first comparators 113 and relatively first add the back coupling signal that overall result and feedback circuit 13 are produced, produce the first phase PWM signal PWM1.The second phase PWM controller 21 comprises the second slope signal generating circuit 211; Produce second slope signal Ramp2 input and add way circuit 212; Add current-sharing signal that the way circuit 212 totallings second slope signal Ramp2, flow equalizing circuit 14 produced and slow and end the slow controlling signal of ending that control circuit 15 is produced; Produce second and add overall result and import second comparator, 213, the second comparators 213 and relatively second add the back coupling signal that overall result and feedback circuit 13 are produced, produce the second phase PWM signal PWM2.Wherein, the slow controlling signal of ending for example can be one by after subtracting the phase signal and triggering, in time and the slope signal that rises, or other various cumulative signals, as shown in Figure 6.Because slow to end signal be cumulative signal, make second to add overall result and increase lentamente, so the work ratio of the second phase PWM signal PWM2 can gradually reduce, and reach the purpose of progressively closing the second phase power stage 22.When the output current convergence of the second phase power stage 22 is zero, just the second phase PWM controller 21 cuts out, and stop the second slope signal Ramp2, to save energy consumption.
Various cumulative signal shown in Figure 6, as be voltage signal, can by with fixing or variable current source to electric capacity continuously or intermittent charge reach, as be current signal, then can reach by the electric current that variable current source produced.
Fig. 7 shows slow another embodiment more specifically that ends work ratio that controlling signal reduces by the second phase PWM signal PWM2 gradually.Generally speaking; Be typically provided with upper current limit protection (Over-Current Protection in each phase PWM controller 11 and 21; OCP); Its circuit exemplary embodiment is that the signal relevant with this phase output current (first signal or second signal) compared with a preset upper current limit reference value, and controls the work ratio of power transistor in this phase power stage, makes the output current of this phase be no more than preset upper current limit value.Therefore; In the second phase PWM controller 21, be provided with (other circuit in the second phase PWM controller 21 omits to simplify drawing) under the situation of upper current limit protective circuit 215; Shown in this figure; Can make the second phase PWM controller 21 receive the slow slow controlling signal of ending that control circuit 15 is produced of ending, as the reference signal REFoc of upper current limit protective circuit 215 in the second phase PWM controller 21, and make reference signal REFoc for signal decrescence (after subtracting the triggering of phase signal; Descend in time; Be for example and without limitation to Fig. 8 and lift each example), so can reduce by the work ratio of the second phase PWM signal PWM2 gradually, progressively the output current I2 of the second phase power stage 22 is reduced to and levels off to zero.
Various decrescence signals shown in Figure 8, as be voltage signal, can by with fixing or variable current source to electric capacity continuously or intermittent discharge reach, as be current signal, then can deduct the electric current that variable current source produces and reach by fixed current.
Fig. 9 shows another embodiment of basic framework of the present invention.Heterogeneous switched power supply as shown in the figure and embodiment shown in Figure 3 compare; Present embodiment has a plurality of second phase PWM controllers 21; Produce a plurality of second phase PWM signal PWM2 according to the back coupling signal; And, directly or indirectly reduce the work ratio of the second phase PWM signal PWM2 that need close gradually according to the slow controlling signal of ending, output current to zero in order to what progressively reduce the second phase power stage 22 that need close.
Below to preferred embodiment the present invention being described, is the above, be merely to make those skilled in the art be easy to understand content of the present invention, and be not to be used for limiting interest field of the present invention.Under same spirit of the present invention, those skilled in the art can think and various equivalence changes.For example, shown in each embodiment circuit, can insert the element that does not influence the main meaning of signal, like other switch etc.; The represented meaning of the high low level of digital signal can be exchanged, and for example subtracts the phase signal and can change into the high levels of signal and representing; Positive and negative can the exchange of input of comparator 113,213 etc. for example only needs the signal processing mode of corresponding correction circuit to get final product again; Again for example; Among Fig. 5 embodiment, also can change the output addition that ends controlling signal and feedback circuit 13 with slow, but not (this moment, the slow controlling signal of ending can be decrescence signal with the second slope signal Ramp2 addition; Or with the output of feedback circuit 13 and negative slow only controlling signal addition), or the like.All this kind all can teaching according to the present invention be analogized and gets, and therefore, protection scope of the present invention should contain above-mentioned and other all equivalences change.
Claims (11)
1. a heterogeneous switched power supply is characterized in that, comprises:
The first phase power stage according to one first phase PWM signal, is switched at least one power transistor to control first output current of the first phase power stage;
At least one second phase power stage; According at least one second phase PWM signal; Switch respectively in the second corresponding phase power stage at least one power transistor with control flows respectively through at least one second output current of the second phase power stage of correspondence, with this first mutually power stage convert input voltage into output voltage jointly;
Feedback circuit produces a back coupling signal according to this output voltage;
Flow equalizing circuit, according to one be relevant to first signal of this first output current, at least one second signal and that is relevant to this second output current subtracts the phase signal, produces a current-sharing signal, wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal;
The first phase PWM controller producing this first phase PWM signal, and is adjusted this first phase PWM signal according to this current-sharing signal according to this back coupling signal;
At least one second phase PWM controller producing corresponding at least one second phase PWM signal, and is adjusted corresponding at least one second phase PWM signal according to this current-sharing signal according to this back coupling signal; And
The slow control circuit that ends according to subtracting the phase signal, produces a slow controlling signal of ending, and this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
2. heterogeneous switched power supply as claimed in claim 1 wherein, comprises in each second phase PWM controller: the slope signal generating circuit, and it produces a slope signal; Comparator; Its according to slope signal, current-sharing signal, slowly end controlling signal, and feedback signal; And produce the second phase PWM signal, wherein should slowly end controlling signal and be cumulative or signal decrescence in time, so that the work of this second phase PWM signal is more zero than being reduced to gradually.
3. heterogeneous switched power supply as claimed in claim 2; Wherein, Each second phase PWM controller also comprises one and adds way circuit; With this slope signal, current-sharing signal, slow end controlling signal, with a part of signal addition of feedbacking in the signal after, input comparator is with this slope signal, current-sharing signal, slowly end controlling signal, compare with other part signal of feedbacking in the signal.
4. heterogeneous switched power supply as claimed in claim 1; Wherein, Comprise a upper current limit protective circuit in each second phase PWM controller; Second signal that it is relatively more corresponding and upper current limit protection reference signal to produce the work ratio of power transistor in this second phase power stage of output control, make the second corresponding output current be no more than preset upper current limit value; Wherein, This upper current limit protective circuit receives should slowly end controlling signal as its upper current limit protection reference signal; And should slow end controlling signal and be signal decrescence, the upper limit of second output current of correspondence was reduced to zero gradually so that second output current that should correspondence is reduced to zero gradually.
5. heterogeneous switched power supply drive circuit; This heterogeneous switched power supply is according to one the one PWM signal, with at least one second PWM signal mutually, switch respectively the first phase power stage with at least one second mutually in the power stage at least one power transistor to produce first output current and second output current; Convert input voltage into output voltage jointly; And, it is characterized in that this heterogeneous switched power supply drive circuit comprises according to this output voltage generation one back coupling signal:
Flow equalizing circuit subtracts the phase signal according to first output current, second output current and, produces a current-sharing signal, and wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal;
The first phase PWM controller producing this first phase PWM signal, and is adjusted this first phase PWM signal according to this current-sharing signal according to this back coupling signal;
At least one second phase PWM controller producing at least one second phase PWM signal of this correspondence, and is adjusted this at least one second phase PWM signal according to this current-sharing signal according to this back coupling signal; And
The slow control circuit that ends according to subtracting the phase signal, produces a slow controlling signal of ending, and this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
6. heterogeneous switched power supply drive circuit as claimed in claim 5 wherein, comprises in each second phase PWM controller: the slope signal generating circuit, and it produces a slope signal; Comparator; Its according to slope signal, current-sharing signal, slowly end controlling signal, and feedback signal; And produce the second phase PWM signal, wherein should slowly end controlling signal and be cumulative or signal decrescence in time, so that the work of this second phase PWM signal is more zero than being reduced to gradually.
7. heterogeneous switched power supply drive circuit as claimed in claim 5; Wherein, Each second phase PWM controller also comprises one and adds way circuit; With this slope signal, current-sharing signal, slow end controlling signal, with a part of signal addition of feedbacking in the signal after, input comparator is with this slope signal, current-sharing signal, slowly end controlling signal, compare with other part signal of feedbacking in the signal.
8. heterogeneous switched power supply drive circuit as claimed in claim 5; Wherein, Comprise a upper current limit protective circuit in each second phase PWM controller; Second signal that it is relatively more corresponding and upper current limit protection reference signal to produce the work ratio of power transistor in this second phase power stage of output control, make the second corresponding output current be no more than preset upper current limit value; Wherein, This upper current limit protective circuit receives should slowly end controlling signal as its upper current limit protection reference signal; And should slow end controlling signal and be signal decrescence, the upper limit of second output current of correspondence was reduced to zero gradually so that second output current that should correspondence is reduced to zero gradually.
9. heterogeneous switched power supply control method; This heterogeneous switched power supply is according to one first phase PWM signal, with at least one second PWM signal mutually, switch respectively the first phase power stage with at least one second mutually in the power stage at least one power transistor to produce first output current and second output current; Convert input voltage into output voltage jointly; And, it is characterized in that this heterogeneous switched power supply control method comprises according to this output voltage generation one back coupling signal:
Subtract the phase signal according to first output current, second output current and, produce a current-sharing signal, wherein this subtracts the quantity that the second phase power stage is closed in the decision of phase signal;
Producing this first phase PWM signal, and adjust this first phase PWM signal according to this back coupling signal according to this current-sharing signal;
Producing at least one second phase PWM signal of this correspondence, and adjust this at least one second phase PWM signal according to this back coupling signal according to this current-sharing signal; And
According to subtracting the phase signal, produce a slow controlling signal of ending, this slow controlling signal of ending is with a progressive mode, and second output current of one or more second phase power stage that need are closed is reduced to zero gradually, to close the second corresponding phase power stage.
10. heterogeneous switched power supply control method as claimed in claim 9; Wherein, Each second phase PWM controller according to a slope signal, current-sharing signal, slowly end controlling signal, and feedback signal; And produce the second phase PWM signal, and this progressive mode makes the slow controlling signal of ending cumulative or decrescence, with the work of the second phase PWM signal of correspondence than being reduced to zero gradually so that the second corresponding output current is reduced to zero gradually.
11. heterogeneous switched power supply control method as claimed in claim 9, wherein, progressive mode is according to the slow controlling signal of ending, and the upper limit of the second phase output current of correspondence is reduced to zero gradually so that the second corresponding output current is reduced to zero gradually.
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| CN109309451B (en) * | 2017-07-26 | 2020-09-29 | 立锜科技股份有限公司 | Multiphase switching power supply, control circuit and control method thereof |
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Application publication date: 20120516 |