CN102594143B - Multiphase switching mode power supply, and drive circuit and control method thereof - Google Patents
Multiphase switching mode power supply, and drive circuit and control method thereof Download PDFInfo
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Abstract
The invention provides a multiphase switching mode power supply, and a drive circuit and a control method thereof. The multiphase switching mode power supply comprises at least two power levels and a current-sharing circuit, wherein the power levels switch power transistors to convert input voltage into output voltage respectively according to pulse width modulation (PWM) signals produced by corresponding controllers, and the current-sharing circuit generates current-sharing signals according to current in each of the power level and phase increasing or phase reducing signals, so that average distribution of current of each of the power level is achieved. According to the multiphase switching mode power supply, and the drive circuit and the control method thereof, gains of current-sharing circuit can be adjusted, so that output voltage swell or dip during phase conversion can be improved, and function of current-sharing is maintained.
Description
Technical field
The present invention relates to a kind of heterogeneous switched power supply and drive circuit and control method, refer to especially a kind ofly when the increasing/reducing power stage number of phases, the gain of adjusting flow equalizing circuit is to avoid voltage to jump or heterogeneous switched power supply and drive circuit and the control method of bust.
Background technology
Fig. 1 shows the heterogeneous switched power supply circuit diagram of prior art, first-phase PWM (pulse width modulation wherein, pulse-width modulation) controller 11 is exported respectively PWM1 and PWM2 signal with second-phase PWM controller 21, to control each other power transistor in first-phase power stage 12 and second-phase power stage 22, input voltage vin is converted to output voltage V out.Feedback circuit 13 produces the back coupling signal relevant to output voltage V out and this back coupling signal is inputted respectively to first-phase PWM controller 11 and second-phase PWM controller 21.In addition, flow equalizing circuit 14 receives first signal and second signal relevant with the second inductance I2 to the first inductive current I1, output current-sharing signal inputs to first-phase power stage 12 and second-phase power stage 22, make first-phase PWM controller 11 and second-phase PWM controller 21 can control respectively first-phase power stage 12 and second-phase power stage 22, with mean allocation electric current I 1 and I2, and then make output current Iout reach the target of setting.Power stage 12 can be with 22 but is not limited to synchronize or asynchronous voltage-dropping type, booster type, back-pressure type or buck-boost type change-over circuit, as shown in Fig. 2 A-2J.
When load is underloading, does not need all power stages to supply with electric current to load, and can close at least one power stage (subtracting phase), to reduce the operational losses of circuit.When having this to need, the practice of prior art is directly to close second-phase power stage 22 completely, is also about to subtract phase signal input second-phase PWM controller 21, the work of PWM2 signal is reduced to zero than at once.Yet the electric current I 1 of first-phase power stage 12, just can reach needed load current by one period of buffer time of needs.In this process, often cause the bust of output voltage, in system, often easily cause the situation when machine.
U.S. Patent Application No. discloses a kind of heterogeneous switched power supply No. 2008/0272752, can be in the situation that maintaining output voltage, power stage in shutoff operation, but the application of this patent, the power stage that must have three-phase at least, the corresponding PWM signal of power stage that this invention must be wanted other to turn off is in addition added in the PWM signal of first-phase, therefore it cannot avoid retaining in the power stage of phase, the restriction of inductive current slope, output voltage still has the phenomenon of bust.
On the other hand, when load is when underloading becomes heavy duty, need the power stage of recovering originally to close to supply with electric current to load, that is need to increase phase (increasing at least one power stage of conducting).When having this to need, the practice of prior art is to open second-phase power stage 22 (suppose script close be second-phase power stage 22), now, increase phase signal input second-phase PWM controller 21, with conducting second-phase power stage 22, and flow equalizing circuit 14 starts to detect each phase inductance electric current and compares and control and reach the object of current-sharing.Yet when receiving increasing phase signals, originally the inductive current of the power stage in work must be higher than current-sharing desired value, and the effect of flow equalizing circuit 14 will decline this power stage current in originally working, cause each phase inductance electric current to add insufficient total amount required load current is enough provided, so in transfer process, often cause the bust of output voltage, in system, easily cause the situation when machine.
U.S. Patent Application No. discloses a kind of heterogeneous control system No. 2006/7023182, according to the signal that is relevant to output current, in compulsory mode, the work of the PWM signal of PWM controller output is likened to the action that increases or reduce.To the power stage that newly adds effect fixing increase work ratio, the bust of active power stage output voltage that causes when fixedly minimizing work recently improves increasing action power stage originally.This kind forced the mode of increase/minimizing work ratio, unnatural, and still cannot avoid the bust of output voltage completely.
In view of this, the present invention is for above-mentioned the deficiencies in the prior art, proposes a kind ofly in conducting or while closing power stage, avoids heterogeneous switched power supply and drive circuit and the control method of voltage die to adjust the mode of flow equalizing circuit gain.
Summary of the invention
One of the object of the invention is to overcome the deficiencies in the prior art and defect, proposes a kind of heterogeneous switched power supply.
Another object of the present invention is to, propose a kind of drive circuit of heterogeneous switched power supply.
Another object 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: first-phase power stage, according to a first-phase PWM signal, switch at least one first power transistor; At least one second-phase power stage, according at least one second-phase PWM signal, switches respectively in corresponding second-phase power stage at least one second power transistor jointly input voltage is converted to output voltage with this first-phase power stage; Feedback circuit, produces a back coupling signal according to this output voltage; First-phase PWM controller, to produce this first-phase PWM signal, and adjusts this first-phase PWM signal according to a current-sharing signal according to this back coupling signal; At least one second-phase PWM controller, according to this back coupling signal to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal, and receive one and increase/subtract phase signal to determine conducting or to close the quantity of this second-phase power stage; And flow equalizing circuit, according to first signal and at least one second signal at least one and that second-phase power stage output current relevant relevant to first-phase power stage output current, produce this current-sharing signal, wherein this flow equalizing circuit is controlled by this and increases/subtract phase signal and the gain of closing or reduce flow equalizing circuit.
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 a first-phase PWM signal, with at least one second-phase PWM signal, switch respectively in first-phase power stage and at least one second-phase power stage at least one power transistor jointly input voltage is converted to output voltage, and produce a back coupling signal according to this output voltage, this heterogeneous switched power supply drive circuit comprises: first-phase PWM controller, according to this back coupling signal to produce this first-phase PWM signal, and adjust this first-phase PWM signal according to a current-sharing signal, at least one second-phase PWM controller, according to this back coupling signal to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal, and receive one and increase/subtract phase signal to determine conducting or to close the quantity of this second-phase power stage, and flow equalizing circuit, according to first signal relevant to first-phase power stage output current and at least one second signal relevant with at least one second-phase power stage output current, produce this current-sharing signal, wherein this flow equalizing circuit is controlled by this and increases/subtract phase signal and the gain of closing or reduce flow equalizing circuit.
In above-mentioned heterogeneous switched power supply or heterogeneous switched power supply drive circuit, this flow equalizing circuit receives while increasing/subtracting phase signal, gain should be reduced to zero or convergence zero.
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 a first-phase PWM signal, with at least one second-phase PWM signal, switch respectively in first-phase power stage and at least one second-phase power stage at least one power transistor jointly input voltage is converted to output voltage, and produce a back coupling signal according to this output voltage, this heterogeneous switched power supply control method comprises: according to this back coupling signal to produce this first-phase PWM signal, and adjust this first-phase PWM signal according to a current-sharing signal, according to this back coupling signal, to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal, according to first signal relevant to first-phase power stage output current and at least one second signal relevant with at least one second-phase power stage output current, produce this current-sharing signal, wherein this current-sharing signal has a gain, receive one and increase/subtract phase signal, to determine conducting or to close the quantity of this second-phase power stage, and increase/subtract phase signal according to this, stop this current-sharing signal or reduce the gain of this current-sharing signal.
After output voltage tends towards stability, or after increasing/subtract phase transformation a period of time, can be appropriate value by the gain recovery of this flow equalizing circuit.
Below by specific embodiment, illustrate in detail, when the effect that is easier to understand object of the present invention, technology contents, feature and reaches.
Accompanying drawing explanation
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-4D is presented in different flow equalizing circuit gain situations, the waveform schematic diagram of output voltage;
Fig. 4 E shows the waveform schematic diagram that increases/subtract phase signal;
Fig. 5 A-5B shows that flow equalizing circuit gain is the waveform schematic diagram of the output current of 1.0 o'clock;
Fig. 5 C shows the waveform schematic diagram that increases/subtract phase signal;
In Fig. 6 A-6B demonstration embodiment of the present invention, flow equalizing circuit gain is the waveform schematic diagram of the output current of 0 o'clock;
Fig. 6 C shows the waveform schematic diagram that increases/subtract phase signal;
Fig. 7 A illustrates the more specifically embodiment that increases/subtract the conducting of phase signal or close second-phase power stage;
Fig. 7 B-7C shows the execution mode of flow equalizing circuit for example;
Fig. 8 A-8F shows the adjustment mode of several flow equalizing circuit gains;
Fig. 9 shows another embodiment of basic framework of the present invention.
Symbol description in 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
141 subtraction circuits
142 adjustable gain circuit
21 second-phase PWM controllers
211 second slope signal generating circuits
212 add way circuit
213 second comparators
22 second-phase power stages
I1 first-phase output current
I2 second-phase output current
Iout output current
PWM1 first-phase PWM signal
PWM2 second-phase PWM signal
Vin input voltage
Vout output voltage
Embodiment
Basic fundamental thought of the present invention is when loading on of heterogeneous switched power supply converts between underloading and heavy duty, while namely needing the power stage of increase or minimizing effect, according to increasing/subtract phase signal, close or adjust the flow equalizing circuit gain of flow equalizing circuit 14, with progressive mode, increase or reduce the power stage output current that needs conducting or close, avoid causing the bust of output voltage, and then affect system normal running.
Fig. 3 shows an embodiment of basic framework of the present invention, and wherein first-phase power stage 11 and second-phase power stage 22 are such as but not limited to can be synchronizeing or asynchronous voltage-dropping type, booster type, back-pressure type or buck-boost type change-over circuit shown in Fig. 2 A-2J; For the purpose of convenient illustrations, suppose that the controlled object that increases/subtract phase time is second-phase power stage 22, but certainly, the controlled object that increases/subtract phase time also can be first-phase power stage 11, or both alternate turns.In Fig. 3, first-phase PWM controller 11 is exported respectively PWM1 and PWM2 signal with second-phase PWM controller 21, to control at least one power transistor in first-phase power stage 12 and second-phase power stage 22, jointly input voltage vin is converted to output voltage V out.Feedback circuit 13 produces the back coupling signal relevant to output voltage V out and this back coupling signal is inputted respectively to first-phase PWM controller 11 and second-phase PWM controller 21.In addition, flow equalizing circuit 14 receives first signal and second signal relevant with the second inductance I2 to the first inductive current I1, output current-sharing signal input first-phase power stage 12 and second-phase power stage 22, make first-phase PWM controller 11 and second-phase PWM controller 21 can control respectively first-phase power stage 12 and second-phase power stage 22, with mean allocation electric current I 1 and I2, and then make output current Iout reach the target of setting.
The difference of the present invention and prior art is, increases/subtract phase signal except offering second-phase pwm control circuit 21, also offers flow equalizing circuit 14; Flow equalizing circuit 14 is according to the gain that increases/subtract phase signal and close or adjust flow equalizing circuit 14, to avoid causing the bust of output voltage in increasing/subtract phase transformation process.
Take below and increase phase situation as example explanation superior part of the present invention.Please first consult Fig. 4 B and Fig. 5 A-5C, the shortcoming of prior art is described.As shown in Fig. 4 E and 5C, when time t1, increasing/subtract phase signal produces the signal of second-phase power stage 22 conductings, so 22 conductings of second-phase power stage and flow equalizing circuit 14 get started work, in the prior art, flow equalizing circuit gain is 1.0, now the output current of first-phase power stage is as the I1 in Fig. 5 A, and the output current of second-phase power stage is as the I2 in Fig. 5 A, as seen from the figure, effect because of flow equalizing circuit 14, make first-phase output current I1 bust, because total output current Iout is the summation of first-phase output current I1 and second-phase output current I2, therefore as shown in Figure 5 B, also there is bust in total output current Iout.Contrast Fig. 4 B, shows the also corresponding bust that occurs of output voltage V out.This because of, flow equalizing circuit 14 is given each phase current-sharing desired value, but the active first-phase power stage of script, its output current I1 is far above this desired value, therefore in the transition period that increases phase, first-phase power stage reduces its output current I1 at once, but second-phase power stage not yet catch up with current-sharing desired value, causing electric current to add insufficient total amount enough provides required load current, so in process, causes the bust of output voltage.
Refer to Fig. 4 A-4E, wherein the gain of the flow equalizing circuit of Fig. 4 A-4D is respectively 3.0,1.0,0.5,0, Fig. 4 E shows the waveform that increases/subtract phase signal, as seen from the figure, when being 3.0, flow equalizing circuit gain will cause jumping of output voltage V out, gain is that 0.5 o'clock output voltage V out bust situation is to be slightly improved for 1.0 o'clock than gain, and is 0 when gaining, that is while closing flow equalizing circuit 14, best results, there is not bust phenomenon in output voltage V out.Therefore according to the present invention, in the transition period that increases/subtract phase, should close flow equalizing circuit 14, or reduce the gain of flow equalizing circuit 14.
Fig. 6 A-6C demonstration, according to the present invention, during increasing phase transformation, making flow equalizing circuit gain is the waveform schematic diagram of the output current of 0 o'clock.As shown in Figure 6 C, when time t1, increasing/subtract phase signal produces the signal of second-phase power stage 22 conductings, when flow equalizing circuit gain is 0, the output current of first-phase power stage is as the I1 in 6A figure, and the output current of second-phase power stage is as the I2 in Fig. 6 A, Fig. 6 B shows the total current Iout of output.From Fig. 6 A, can find out that first-phase output current I1 is the variation of slow decreasing, and Fig. 6 B can find out that output current Iout does not have bust phenomenon, contrast Fig. 4 D, shows that output voltage V out bust can not occur accordingly yet.Therefore, in the transition period that increases phase, by flow equalizing circuit gain setting, be 0 or convergence 0 or close flow equalizing circuit 14, have good conversion.Even but flow equalizing circuit 14 is not closed completely, as reduced the gain of flow equalizing circuit 14, also can alleviate the phenomenon of output voltage V out bust, therefore scope of the present invention also should contain the practice of " reducing flow equalizing circuit gain ".
Except closing flow equalizing circuit 14 or reduce flow equalizing circuit gain during increasing phase transformation, the present inventor also finds, during subtracting phase transformation, as close flow equalizing circuit 14 or reduce flow equalizing circuit gain, also have equally and eliminate or alleviate that output voltage V out jumps or the effect of bust phenomenon.
In the transition period that increases/subtract phase, close flow equalizing circuit 14 or reduce flow equalizing circuit after gain a period of time, when output voltage V, out tends towards stability, and can recover the gain of flow equalizing circuit 14 to be made as appropriate value, for example 1.0 or other value, to control the output current of two-phase power stage, make it balance.Recovery is made as the gain of flow equalizing circuit 14 the time point t2 (consulting aftermentioned Fig. 8 A-8F) of appropriate value, for example can be set as starting at one default period from increasing/subtract phase time point t1, or for example detect, when wherein the output current of a phase arrives (decline or rise to) a certain default value (a certain top/bottom latitude of current-sharing desired value), recover the gain of flow equalizing circuit 14 to be made as appropriate value.
Fig. 7 A illustrates the more specifically embodiment that increases/subtract the conducting of phase signal or close second-phase power stage.As shown in the figure, first-phase PWM controller 11 comprises the first slope signal generating circuit 111, produces the first slope signal input and adds way circuit 112; Add the current-sharing signal that way circuit 112 totalling the first slope signals and flow equalizing circuit 14 produce, produce first and add overall result, by first, add overall result and input the first comparator 113; The first comparator 113 relatively first adds the back coupling signal that overall result and feedback circuit 13 produce, generation first-phase PWM signal PWM1.Second-phase PWM controller 21 comprises the second slope signal generating circuit 211, produces the second slope signal input and adds way circuit 212; Add the current-sharing signal that way circuit 212 totalling the second slope signals and flow equalizing circuit 14 produce, produce second and add overall result, by second, add overall result and input the second comparator 213; The second comparator 213 relatively second adds the back coupling signal that overall result and feedback circuit 13 produce, generation second-phase PWM signal PWM2.Wherein, increase/subtract phase signal except offering second-phase PWM controller 21, also offer flow equalizing circuit 14.
When increasing/subtract phase signal, show when needing conducting or closing second-phase, in an embodiment, can close flow equalizing circuit 14 therein, its mode for example can directly be forbidden (disable) flow equalizing circuit 14, or cuts off equivalently its output signal, as shown in Figure 7 B.In another embodiment, can reduce the gain of flow equalizing circuit 14, its mode for example can be as shown in Fig. 7 C, in the present embodiment, flow equalizing circuit 14 comprises subtraction circuit 141 and adjustable gain circuit 142, subtraction circuit 141 is obtained the difference of the first signal and the second signal, and adjustable gain circuit 142 amplifies this difference.In the present embodiment, can, according to the gain that increases/subtract phase signal and adjust adjustable gain circuit 142, so can, in the transition period that increases/subtract phase, reduce the gain of flow equalizing circuit 14.As wanted, close flow equalizing circuit 14, also can adopt this mode that the gain of flow equalizing circuit 14 is reduced to 0.
Refer to Fig. 8 A-8F, as previously mentioned, close flow equalizing circuit 14 or reduce the problem that flow equalizing circuit gain all contributes to solve prior art, and as the gain of wish reduction flow equalizing circuit, can have all adjustment modes, all should be included within the scope of the present invention.In each figure, show, from increasing/subtract phase time point t1, the gain of flow equalizing circuit 14 can directly be adjusted into 0 or fixed value, or is linearity or nonlinear way decline; Arrive preset time t 2, assert that output voltage V out is stable or approach stable after, the gain of flow equalizing circuit 14 can directly be adjusted to appropriate value, or is linearity or nonlinear way rises to appropriate value.
Fig. 9 shows another embodiment of basic framework of the present invention, shows that the present invention can be applicable to the above heterogeneous switched power supply of three-phase (containing) in figure.The present embodiment has a plurality of second-phase PWM controllers 21, the mode of its control is identical with single second-phase PWM controller 21, increase/subtract phase signal except offering second-phase pwm control circuit 21, determine to need conducting or the quantity of the second-phase power stage of closing, also offer flow equalizing circuit 14; When needs are closed one or more second-phase power stage 22, according to increasing/subtract phase signal, close the gain of flow equalizing circuit 14 or reduction flow equalizing circuit, to avoid flow equalizing circuit 14 during increasing/subtract mutually, output voltage is caused to interference.
Below for preferred embodiment, the present invention is described, just the above, only, for making those skilled in the art be easy to understand content of the present invention, be not 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 affect signal major significance, as other switch etc.; The accurate represented meaning of digital signal high-low-position can be exchanged, for example, increase the low level that phase signal can change into signal and represent, for example the input of comparator 113,213 is positive and negative again can exchange, and only needs the signal processing mode of corresponding correction circuit.All this kind, all can teaching according to the present invention analogize and obtain, and therefore, scope of the present invention should contain above-mentioned and other all equivalences and change.
Claims (9)
1. a heterogeneous switched power supply, is characterized in that, comprises:
First-phase power stage, according to a first-phase PWM signal, switches at least one first power transistor;
At least one second-phase power stage, according at least one second-phase PWM signal, switches respectively at least one second power transistor in corresponding second-phase power stage, jointly input voltage is converted to output voltage with this first-phase power stage;
Feedback circuit, produces a back coupling signal according to this output voltage;
First-phase PWM controller, to produce this first-phase PWM signal, and adjusts this first-phase PWM signal according to a current-sharing signal according to this back coupling signal;
At least one second-phase PWM controller, according to this back coupling signal to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal, and receive one and increase/subtract phase signal to determine conducting or to close the quantity of this second-phase power stage; And
Flow equalizing circuit, according to first signal relevant to first-phase power stage output current and at least one second signal relevant with at least one second-phase power stage output current, produce this current-sharing signal, wherein this flow equalizing circuit is controlled by this and increases/subtract phase signal and close or reduce still the gain at the flow equalizing circuit that power stage receives of work, wherein the effect of this current-sharing signal is in this first-phase power stage and this at least one second-phase power stage, while having heterogeneous work, in order to average this heterogeneous electric current.
2. heterogeneous switched power supply as claimed in claim 1, wherein, this flow equalizing circuit receives while increasing/subtracting phase signal, and gain is reduced to zero or convergence zero.
3. heterogeneous switched power supply as claimed in claim 1, wherein, this first-phase power stage and second-phase power stage are to synchronize or asynchronous voltage-dropping type, booster type, back-pressure type, buck-boost type change-over circuit.
4. a heterogeneous switched power supply drive circuit, this heterogeneous switched power supply is according to a first-phase PWM signal, with at least one second-phase PWM signal, switch respectively in first-phase power stage and at least one second-phase power stage at least one power transistor jointly input voltage is converted to output voltage, and produce a back coupling signal according to this output voltage, it is characterized in that, this heterogeneous switched power supply drive circuit comprises:
First-phase PWM controller, to produce this first-phase PWM signal, and adjusts this first-phase PWM signal according to a current-sharing signal according to this back coupling signal;
At least one second-phase PWM controller, according to this back coupling signal to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal, and receive one and increase/subtract phase signal to determine conducting or to close the quantity of this second-phase power stage; And
Flow equalizing circuit, according to first signal relevant to first-phase power stage output current and at least one second signal relevant with at least one second-phase power stage output current, produce this current-sharing signal, wherein this flow equalizing circuit is controlled by this and increases/subtract phase signal and close or reduce still the gain at the flow equalizing circuit that power stage receives of work, wherein the effect of this current-sharing signal is in this first-phase power stage and this at least one second-phase power stage, while having heterogeneous work, in order to average this heterogeneous electric current.
5. heterogeneous switched power supply drive circuit as claimed in claim 4, wherein, this flow equalizing circuit receives while increasing/subtracting phase signal, and gain is reduced to zero or convergence zero.
6. heterogeneous switched power supply drive circuit as claimed in claim 4, wherein, this first-phase power stage and second-phase power stage are to synchronize or asynchronous voltage-dropping type, booster type, back-pressure type, buck-boost type change-over circuit.
7. a heterogeneous switched power supply control method, this heterogeneous switched power supply is according to a first-phase PWM signal, with at least one second-phase PWM signal, switch respectively in first-phase power stage and at least one second-phase power stage at least one power transistor jointly input voltage is converted to output voltage, and produce a back coupling signal according to this output voltage, it is characterized in that, this heterogeneous switched power supply control method comprises:
According to this back coupling signal, to produce this first-phase PWM signal, and adjust this first-phase PWM signal according to a current-sharing signal;
According to this back coupling signal, to produce this at least one second-phase PWM signal, and adjust this at least one second-phase PWM signal according to this current-sharing signal;
According to first signal relevant to first-phase power stage output current and at least one second signal relevant with at least one second-phase power stage output current, produce this current-sharing signal, wherein this current-sharing signal has a gain;
Receive one and increase/subtract phase signal, to determine conducting or to close the quantity of this second-phase power stage; And
According to this, increase/subtract phase signal, stop this current-sharing signal or reduce the gain that still receives this current-sharing signal in the power stage of work,
Wherein the effect of this current-sharing signal is in this first-phase power stage and this at least one second-phase power stage, while having heterogeneous work, in order to average this heterogeneous electric current.
8. heterogeneous switched power supply control method as claimed in claim 7, wherein, this first-phase power stage and second-phase power stage are to synchronize or asynchronous voltage-dropping type, booster type, back-pressure type, buck-boost type change-over circuit.
9. heterogeneous switched power supply control method as claimed in claim 7, wherein, also comprises: stopping this current-sharing signal or reducing this current-sharing signal after gain a period of time, the gain that recovers this current-sharing signal is appropriate value.
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| US9369043B2 (en) * | 2012-10-23 | 2016-06-14 | Texas Instruments Deutschland Gmbh | Phase current balancing for multiphase converters |
| DE102016211163B4 (en) * | 2016-06-22 | 2019-05-23 | Dialog Semiconductor (Uk) Limited | Multi-phase multi-stage switching power converter system, electronic device and method of operating a multi-phase multi-stage switching power converter system |
| CN108923650B (en) * | 2018-06-27 | 2021-05-18 | 成都芯源系统有限公司 | Multiphase converter and control circuit and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW550444B (en) * | 2001-02-08 | 2003-09-01 | Linear Techn Inc | Multiple phase switching regulators with stage shedding |
| CN101286698A (en) * | 2007-03-30 | 2008-10-15 | 英特尔公司 | Dynamically adjusted multi-phase regulator |
| CN101847027A (en) * | 2009-03-25 | 2010-09-29 | 英特赛尔美国股份有限公司 | Be used to reduce and the system and method that adds mutually |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW550444B (en) * | 2001-02-08 | 2003-09-01 | Linear Techn Inc | Multiple phase switching regulators with stage shedding |
| CN101286698A (en) * | 2007-03-30 | 2008-10-15 | 英特尔公司 | Dynamically adjusted multi-phase regulator |
| CN101847027A (en) * | 2009-03-25 | 2010-09-29 | 英特赛尔美国股份有限公司 | Be used to reduce and the system and method that adds mutually |
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