CN102097940A - Boost-buck switching power supply circuit of constant time and control circuit and method thereof - Google Patents
Boost-buck switching power supply circuit of constant time and control circuit and method thereof Download PDFInfo
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- CN102097940A CN102097940A CN2009102604645A CN200910260464A CN102097940A CN 102097940 A CN102097940 A CN 102097940A CN 2009102604645 A CN2009102604645 A CN 2009102604645A CN 200910260464 A CN200910260464 A CN 200910260464A CN 102097940 A CN102097940 A CN 102097940A
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Abstract
The invention provides a boost-buck switching power supply circuit of constant time, a control circuit and method thereof. The boost-buck switching power supply circuit of the constant time comprises an inductor, first and second power switches coupled to two ends of the inductor respectively, and first and second power elements coupled to two ends of the inductor respectively; the first power switch is coupled between the first end of the inductor and an input voltage; the second power switch is coupled between the second end of the inductor and the ground; the first power element is coupled between the first end of the inductor and the ground; and the second power element is coupled between the second end of the inductor and an output voltage. The control method comprises the following steps of: generating a single constant time; and generating a switch control signal according to the single constant time to control the first and the second power switches so that the switching period and the conduction time of the first and the second power switches are the same.
Description
Technical field
The present invention relates to a kind of fixedly ON time (constant ON-time) or fixedly the buck of shut-in time (constant OFF-time) switch the formula power circuit, be meant that especially a kind of Current Control formula (current mode) or voltage type (voltagemode) buck that only needs to produce one group of set time switch the formula power circuit.The control circuit and the method for formula power circuit also switched in the present invention relevant for the control buck.
Background technology
See also Fig. 1, disclose a kind of method that buck is switched the formula power circuit of controlling in the U.S. Pat 6166527.Buck is switched the formula power circuit and is comprised inductance L, four power switch A, B, C, D, and control circuit 20.Four power switch A of control circuit 20 controls, B, C, the switching of D, input voltage vin is converted to output voltage V out, wherein input voltage vin may be higher or lower than output voltage V out, so power circuit may need to carry out the buck or boost conversion.In the control circuit 20, error amplifier 22 compares feedback signal FB (information of expression output voltage V out) with reference voltage Vref, produce error and amplify signal Vea.PWM (pulse-width modulation) comparator 24,25 amplifies signal Vea and voltage waveform VX and VY relatively with this error respectively, and logical circuit 29 is according to the comparative result of PWM comparator 24,25, produce switch controlling signal VA, VB, VC, VD, difference power controlling switch A, B, C, D.
Error is amplified signal Vea, voltage waveform VX and VY, switch controlling signal VA, VB, VC, the relation of VD as shown in Figure 2, when error was amplified signal Vea and dropped between voltage V1 and the V2, power circuit carried out pure step-down conversion, when error amplification signal Vea drops between voltage V2 and the V3, power circuit carries out the buck conversion, and when error amplification signal Vea dropped between voltage V3 and the V4, power circuit carried out pure boost conversion.Power switch C keeps opening circuit and power switch D keeps conducting when pure step-down translative mode, and power switch A keeps conducting and power switch B keeps opening circuit when pure boost conversion pattern.When the buck translative mode, as shown in the figure, the relativeness of amplifying signal Vea and voltage waveform VX according to error produces switch controlling signal VA, VB, and produce switch controlling signal VC according to the relativeness that error is amplified signal Vea and voltage waveform VY, VD, in other words power circuit (the switch C that boosts, D action) with the married operation of step-down (switch A, B action).
Being characterized as in institute is free of above-mentioned prior art, power switch A, B, C, D all operate in response to feedback signal FB.The shortcoming of this kind arrangement as shown in the figure, when error is amplified signal Vea and only intersected at minimum part with voltage waveform VX, still can produce switch controlling signal VA, VB and make switch A, the B action, but this action will produce switch cost (switchingloss) and energy dissipation is increased; Same situation also can occur in error when amplifying signal Vea and only intersect a little with voltage waveform VY.
Fig. 3 shows the framework of another prior art U.S. Pat 7176667, utilizes error amplifier 22 to produce two grouping errors in this case and amplifies signal Vea1 and Vea2, selects an input PWM comparator 24 and compares with voltage waveform OSC.In addition, a fixed pulse width is set in the circuit in addition produces circuit 26, logical circuit 29 produces switch controlling signal VA according to the output of PWM comparator 24 and the output of fixed pulse width generation circuit 26, VB, VC, VD, difference power controlling switch A, B, C, D.
See also Fig. 4, be divided into four translative mode in the U.S. Pat 7176667, except pure step-down translative mode M1 and pure boost conversion pattern M4, between is provided with step-down translative mode M2 of intermediary and the boost conversion pattern M3 of intermediary in addition, switch controlling signal VA in the step-down translative mode M2 of intermediary, VB follows the output of PWM comparator 24 and switch controlling signal VC, VD is a fixed pulse width, switch controlling signal VC in the step-down translative mode M3 of intermediary, VD follows the output of PWM comparator 24 and switch controlling signal VA, and VB is a fixed pulse width.
The shortcoming of above-mentioned prior art is, the controlling mechanism of four translative mode is comparatively complicated, fixed pulse width need be set in addition produce circuit 26 and other circuit element, and two intermediary's translative mode (M2 and M3) indication circuit operates in this interval chance to be increased, and four power switchs all move in intermediary's translative mode, increase switch cost and energy dissipation.
In addition, U.S. Pat 7518346 also discloses another practice, and the basic framework of this patent is similar to the prior art of Fig. 1, difference is in the voltage waveform VX that produces in it, and VY sees also Fig. 5, voltage waveform VX among this patent US 7518346, VY is non-to be changed in the same way.In addition, the different slope of boosting (Boost Ramp) waveform VY1 and VY2 are also proposed in this case.
In addition, U.S. Pat 7466112 also discloses another practice, sees also Fig. 6, at power switch B, the lower end of C is provided with sensing resistor Rsense in this patent, obtains sensing signal input PWM comparator 24 from its two ends, 25, make power switch A with control, the ON time of D is long as much as possible.
More than in each prior art, all need complicated control circuit and mechanism, control four power switchs, its circuit or controlling mechanism are real dislikes too complicated.
Summary of the invention
One of the object of the invention is to overcome the deficiencies in the prior art and defective, proposes a kind of buck and switches the formula power circuit, and its circuit and controlling mechanism are all more simplified far beyond each prior art.
Another object of the present invention is to, propose a kind of circuit that buck is switched the formula power circuit of controlling.
Another object of the present invention is to, propose a kind of method that buck is switched the formula power circuit of controlling.
For reaching above-mentioned purpose, with regard to one of them viewpoint speech, the invention provides a kind of set time buck and switch the formula power circuit, comprise: an inductance has first end and second end; First power switch, first end of one end and this inductance couples, and its other end and an input voltage couple; Second power switch, first end of one end and this inductance couples, its other end ground connection, the anti-phase switching of this first and second power switch; The 3rd power switch, second end of one end and this inductance couples, its other end ground connection; The 4th power switch, second end of one end and this inductance couples, and its other end and an output voltage couple, the anti-phase switching of the 3rd and the 4th power switch; An and control circuit, it produces one group of set time (constant time), control the operation of above four power switchs, make this first power switch identical, and this is second identical with the switching cycle and the ON time of the 4th power switch with the switching cycle and the ON time of the 3rd power switch.
Above-mentioned buck is switched in the formula power circuit, and the second or the 4th power switch can change and be diode.
Said fixing time buck is switched the formula power circuit and be can be Current Control formula or voltage type, and the described set time can be fixedly ON time or the fixedly control mode of shut-in time.
With regard to another viewpoint speech, the present invention also provides a kind of control circuit, switch the formula power circuit in order to the buck of controlling a set time, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, this control circuit comprises: an error amplifier, the feedback signal relevant with output voltage compared with a reference voltage, produce an error and amplify signal; An independent PWM comparator amplifies signal with one with inductive current signal related and this error and compares; One set time generator, it produces the set time according to the output of this PWM comparator; And one drive circuit, it produces the switch controlling signal and controls this first and second power switch according to the output of set time generator, makes the switching cycle of this first and second power switch and ON time identical.
With regard to another viewpoint speech, the present invention also provides a kind of control circuit, switch the formula power circuit in order to the buck of controlling a set time, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, this control circuit comprises: an error amplifier, the feedback signal relevant with output voltage compared with a reference voltage, produce an error and amplify signal; An independent PWM comparator is compared a sawtooth waveforms signal and this error amplification signal; One set time generator, it produces the set time according to the output of this PWM comparator; And one drive circuit, it produces the switch controlling signal and controls this first and second power switch according to the output of set time generator, makes the switching cycle of this first and second power switch and ON time identical.
Just another viewpoint is sayed again, the invention provides a kind of method that the set time buck is switched the formula power circuit of controlling, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, and this control method comprises: produce the single set time; And according to this single set time, produce the switch controlling signal and control this first and second power switch, make the switching cycle of this first and second power switch and ON time identical.
Illustrate in detail below by specific embodiment, when the effect that is easier to understand purpose of the present invention, technology contents, characteristics and is reached.
Description of drawings
Fig. 1 marks a kind of buck switching formula power circuit of prior art;
Fig. 2 is the waveform corresponding to Fig. 1 circuit;
Fig. 3 marks the buck switching formula power circuit of another kind of prior art;
Fig. 4 is corresponding to the state transition table of Fig. 3 circuit (state machine);
Fig. 5 shows another kind of waveform of the prior art;
Fig. 6 shows again the buck switching formula power circuit of another kind of prior art;
Fig. 7 shows first embodiment of buck switching formula power circuit of the present invention;
The operational scenario of Fig. 8 A-8B explicit declaration first embodiment of the invention;
Fig. 9 shows the second embodiment of the present invention;
Figure 10 is the waveform corresponding to Fig. 9 circuit;
Figure 11 and 12 is two embodiment of display voltage control type buck switching formula power circuit respectively;
Figure 13-18 shows several embodiment in addition of the present invention.
Symbol description among the figure
20 control circuits
22 error amplifiers
24,25 PWM comparators
26 fixed pulse width produce circuit
29 logical circuits
30 control circuits
32 error amplifiers
34 PWM comparators
37 fixedly ON time produce circuit
38 phase-shift circuits
39 drive circuits
A, B, C, D power switch
The FB feedback signal
The L inductance
OSC shakes waveform
The Rsense sensing resistor
VA, VB, VC, VD switch controlling signal
VX, VY, VY1, VY2 voltage waveform
Vea, Vea1, the Vea2 error is amplified signal
The Vin input voltage
The Vout output voltage
The Vref reference voltage
Embodiment
Please refer to Fig. 7, with the Current Control formula, fixedly the framework of ON time is an example, and first embodiment of the present invention is described.The buck of present embodiment is switched the formula power circuit and is comprised inductance L, four power switch A, B, C, D, and control circuit 30.Four power switch A of control circuit 30 controls, B, C, the switching of D is to be converted to input voltage vin output voltage V out.In the control circuit 30, error amplifier 32 compares feedback signal FB (information of expression output voltage V out) with reference voltage Vref, produce error and amplify signal, input PWM comparator 34.In addition, circuit is obtained and the inductive current signal related, in the input PWM comparator 34, amplifies signal relatively with error.The output of PWM comparator 34 sends ON time to and produces circuit 37, to produce the ON time of switch.Drive circuit 39 produces switch drive signal VA according to the ON time that is produced, VB, and VC, VD controls each power switch A, B, C, D.
Characteristics of the present invention are, only need a PWM comparator 34 in the circuit, because only need to produce one group of ON time.See also Fig. 8 A-8B, in the present embodiment, cycle and the ON time of switch drive signal VA and VC are identical, and the cycle of switch drive signal VB and VD and ON time are identical.When switch drive signal VA and VC make power switch A, during the C conducting, buck is switched the formula power circuit to inductance L energy storage (solid line); When switch drive signal VB and VD make power switch B, during the D conducting, inductance L is released can (dotted line).Because the ON time of switch drive signal VA and VC is identical, and switch drive signal VB and VD are respectively the anti-phase of switch drive signal VA and VC, therefore only need to produce one group of ON time in the circuit, on the circuit hardware or all simple on the controlling mechanism far beyond each prior art.
Fig. 9-10 marks an alternative embodiment of the invention.The cycle of switch drive signal VA and VC and ON time are identical in the present embodiment, but have phase difference between the two; The cycle of switch drive signal VB and VD and ON time are also identical, but also have phase difference between the two.This phase difference can be in Fig. 7 circuit because of circuit element not exclusively due to the coupling, or as Fig. 9 circuit via phase shift (phase shift) circuit 38 the control generation.Though have phase difference between switch drive signal VA and VC (or switch drive signal VB and VD), do not influence the function of circuit, still can reach the power adjustment effect of buck.
Fig. 7 and Fig. 9 are shown to be the switched-mode power supply circuit framework of Current Control formula, but the present invention can be applicable to the switched-mode power supply circuit framework of voltage type (voltage mode) too.Figure 11 and Figure 12 display switch respectively drive no phase difference and dephased embodiment between signal VA and VC (or switch drive signal VB and VD), wherein one of input of PWM comparator 34 receives error amplification signal, the sawtooth waveforms signal that other end receiving circuit inside is produced.The producing method of sawtooth waveforms signal and waveform have the various practices, are well known to those skilled in the art, because of non-emphasis of the present invention, so will not give unnecessary details.
The invention is not restricted to be applied in synchronous (synchronous) buck with four power switchs switches in the formula power circuit.See also the embodiment of Figure 13-18: embodiment illustrated in fig. 13 is the Current Control formula, but wherein switch B is replaced by diode.Embodiment illustrated in fig. 14 is voltage type, and wherein switch B is also replaced by diode.Embodiment illustrated in fig. 15 is the Current Control formula, but wherein switch D is replaced by diode.Embodiment illustrated in fig. 16 is voltage type, and wherein switch D is also replaced by diode.Embodiment illustrated in fig. 17 is the Current Control formula, but switch B wherein, D is all replaced by diode.Embodiment illustrated in fig. 18 is voltage type, switch B wherein, and D is also all replaced by diode.Above circuit all can be used the present invention, only uses a PWM comparator 34, produces one group of ON time.
Below at preferred embodiment the present invention is described, just the above for making those skilled in the art be easy to understand content of the present invention, is not to be used for limiting interest field of the present invention only.Under same spirit of the present invention, those skilled in the art can think and various equivalence changes.For example, each power switch A, B, C, D can be PMOS or NMOS, and the positive-negative input end of PWM comparator 34 can be done corresponding conversion; And for example, though various embodiments of the present invention are described as the framework of " fixedly ON time ", same notion obviously can be applicable to the framework of " fixedly shut-in time (constant OFF-time) ".Therefore, scope of the present invention should contain above-mentioned and other all equivalence variations.
Claims (21)
1. the buck of a set time is switched the formula power circuit, it is characterized in that, comprises:
One inductance has first end and second end;
First power switch, first end of one end and this inductance couples, and its other end and an input voltage couple;
Second power switch, first end of one end and this inductance couples, its other end ground connection, the anti-phase switching of this first and second power switch;
The 3rd power switch, second end of one end and this inductance couples, its other end ground connection;
The 4th power switch, second end of one end and this inductance couples, and its other end and an output voltage couple, the anti-phase switching of the 3rd and the 4th power switch; And
One control circuit, it produces one group of set time, control the operation of above four power switchs, make this first power switch identical, and this is second identical with the switching cycle and the ON time of the 4th power switch with the switching cycle and the ON time of the 3rd power switch.
2. the buck of set time as claimed in claim 1 is switched the formula power circuit, and wherein, the switching cycle of this first power switch and the 3rd power switch has phase difference, and the switching cycle of this second and the 4th power switch has phase difference.
3. the buck of set time as claimed in claim 1 is switched the formula power circuit, and wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator will amplify signal with inductive current signal related and this error and compare;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it is according to the output of set time generator, produces the switch controlling signal, control this first, second, third, with the 4th power switch.
4. the buck of set time as claimed in claim 1 is switched the formula power circuit, and wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator is compared a sawtooth waveforms signal and this error amplification signal;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it is according to the output of set time generator, produces the switch controlling signal, control this first, second, third, with the 4th power switch.
5. the buck of a set time is switched the formula power circuit, it is characterized in that, comprises:
One inductance has first end and second end;
First power switch, first end of one end and this inductance couples, and its other end and an input voltage couple;
Second power switch, first end of one end and this inductance couples, its other end ground connection, the anti-phase switching of this first and second power switch;
The 3rd power switch, second end of one end and this inductance couples, its other end ground connection;
Diode, second end of one end and this inductance couples, and its other end and an output voltage couple; And
One control circuit, its produce one group of set time control first, second, with the operation of the 3rd power switch, make this first power switch identical with the switching cycle and the ON time of the 3rd power switch.
6. the buck of set time as claimed in claim 5 is switched the formula power circuit, and wherein, the switching cycle of this first power switch and the 3rd power switch has phase difference.
7. the buck of a set time is switched the formula power circuit, it is characterized in that, comprises:
One inductance has first end and second end;
First power switch, first end of one end and this inductance couples, and its other end and an input voltage couple;
Diode, first end of one end and this inductance couples, its other end ground connection;
Second power switch, second end of one end and this inductance couples, and its other end and an output voltage couple;
The 3rd power switch, second end of one end and this inductance couples, its other end ground connection, the anti-phase switching of this second and the 3rd power switch; And
One control circuit, its produce one group of set time control first, second, with the operation of the 3rd power switch, make this first power switch identical with the switching cycle and the ON time of the 3rd power switch.
8. the buck of set time as claimed in claim 7 is switched the formula power circuit, and wherein, the switching cycle of this first power switch and the 3rd power switch has phase difference.
9. switch the formula power circuit as claim 5 or 7 described bucks, wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator will amplify signal with inductive current signal related and this error and compare;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it is according to the output of set time generator, produces the switch controlling signal, control this first, second, with the 3rd power switch.
10. switch the formula power circuit as claim 5 or 7 described bucks, wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator is compared a sawtooth waveforms signal and this error amplification signal;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it is according to the output of set time generator, produces the switch controlling signal, control this first, second, with the 3rd power switch.
11. the buck of a set time is switched the formula power circuit, it is characterized in that, comprises:
One inductance has first end and second end;
First power switch, first end of one end and this inductance couples, and its other end and an input voltage couple;
First diode, first end of one end and this inductance couples, its other end ground connection;
Second power switch, second end of one end and this inductance couples, its other end ground connection;
Second diode, second end of one end and this inductance couples, and its other end and an output voltage couple; And
One control circuit, it produces one group of set time and controls the operation of first and second power switch, makes this first power switch identical with the switching cycle and the ON time of this second power switch.
12. the buck of set time as claimed in claim 11 is switched the formula power circuit, wherein, the switching cycle of this first power switch and this second power switch has phase difference.
13. the buck of set time as claimed in claim 11 is switched the formula power circuit, wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator will amplify signal with inductive current signal related and this error and compare;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it produces the switch controlling signal according to the output of set time generator, controls this first and second power switch.
14. the buck of set time as claimed in claim 11 is switched the formula power circuit, wherein, this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator is compared a sawtooth waveforms signal and this error amplification signal;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it produces the switch controlling signal according to the output of set time generator, controls this first and second power switch.
15. control circuit, switch the formula power circuit in order to the buck of controlling a set time, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, it is characterized in that this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator amplifies signal with one with inductive current signal related and this error and compares;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it produces the switch controlling signal and controls this first and second power switch according to the output of set time generator, makes the switching cycle of this first and second power switch and ON time identical.
16. control circuit, switch the formula power circuit in order to the buck of controlling a set time, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, it is characterized in that this control circuit comprises:
One error amplifier is compared the feedback signal relevant with output voltage with a reference voltage, produce an error and amplify signal;
An independent PWM comparator is compared a sawtooth waveforms signal and this error amplification signal;
One set time generator, it produces the set time according to the output of this PWM comparator; And
One drive circuit, it produces the switch controlling signal and controls this first and second power switch according to the output of set time generator, makes the switching cycle of this first and second power switch and ON time identical.
17. as claim 15 or 16 described control circuits, wherein, the switching cycle of this first and second power switch has phase difference.
18. control the method that the set time buck is switched the formula power circuit for one kind, this buck is switched the formula power circuit and is comprised an inductance, be respectively coupled to first and second power switch at these inductance two ends, and be respectively coupled to first and second power component at these inductance two ends, this first power switch is coupled between inductance first end and the input voltage, this second power switch is coupled between inductance second end and the ground, this first power component is coupled between inductance first end and the ground, this second power component is coupled between inductance second end and the output voltage, it is characterized in that this control method comprises:
Produce the single set time; And
According to this single set time, produce the switch controlling signal and control this first and second power switch, make the switching cycle of this first and second power switch and ON time identical.
19. control set time buck as claimed in claim 18 is switched the method for formula power circuit, wherein, this step that produces the single set time comprises:
The feedback signal relevant with output voltage compared with a reference voltage, produce an error and amplify signal; And
Amplify signal with one with inductive current signal related and this error and compare, and, produce this single set time according to comparative result.
20. control set time buck as claimed in claim 18 is switched the method for formula power circuit, wherein, this step that produces the single set time comprises:
The feedback signal relevant with output voltage compared with a reference voltage, produce an error and amplify signal; And
One sawtooth waveforms signal and this error amplification signal are compared, and, produce the single set time according to comparative result.
21. control circuit as claimed in claim 18, wherein, the switching cycle of this first and second power switch has phase difference.
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| CN104467427A (en) * | 2014-11-13 | 2015-03-25 | 南京矽力杰半导体技术有限公司 | Switching control circuit and method for four-tube Buck-Boost converter |
| WO2015062483A1 (en) * | 2013-10-28 | 2015-05-07 | Neal George Stewart | High frequency series ac voltage regulator |
| CN108054918A (en) * | 2017-11-20 | 2018-05-18 | 华为数字技术（苏州）有限公司 | A kind of control method, control circuit and the system of four pipes BUCK-BOOST circuits |
| CN108336905A (en) * | 2017-11-16 | 2018-07-27 | 上海芯导电子科技有限公司 | A kind of DC-DC circuit |
| WO2018223348A1 (en) * | 2017-06-08 | 2018-12-13 | Texas Instruments Incorporated | Non-inverting buck-boost converter control |
| CN113517813A (en) * | 2021-05-14 | 2021-10-19 | 成都华微电子科技有限公司 | Fixed frequency dual-mode synchronous voltage reduction controller |
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Application publication date: 20110615 |