CN102624206A - Self-adaptive continuous-flow control method and device for pseudo continuous conductive mode switch converter - Google Patents
Self-adaptive continuous-flow control method and device for pseudo continuous conductive mode switch converter Download PDFInfo
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- CN102624206A CN102624206A CN2012101153594A CN201210115359A CN102624206A CN 102624206 A CN102624206 A CN 102624206A CN 2012101153594 A CN2012101153594 A CN 2012101153594A CN 201210115359 A CN201210115359 A CN 201210115359A CN 102624206 A CN102624206 A CN 102624206A
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Abstract
The invention discloses a self-adaptive continuous-flow control method and a device ACD for a pseudo continuous conductive mode (PCCM) switch converter. A self-adaptive reference current is synthesized by calculating inductance current and outputted current of the PCCM switch converter, the self-adaptive reference current is compared with an inductance current so as to control the connection and disconnection of a continuous-flow switch tube of the PCCM switch converter. The self-adaptive continuous-flow control method and the device can be used for controlling different continuous-flow switch tubes of the PCCM switch converters with different topological structures and can be matched with any control method and any device of a main switch pipe of the PCCM switch converter. The self-adaptive continuous-flow control method and the device have advantages that no compensation network is needed, simplicity in control can be realized, the instantaneous response speed is fast, and the efficiency is high.
Description
Technical field
The present invention relates to a kind of control method and device thereof of switch converters, be specially a kind of pseudo-continuous conduction mode switch converters self adaptation afterflow control method and realize the device ACD of said self adaptation afterflow control method.
Background technology
Along with the development of power electronic device technology and electric electronic current change technology, become the focus of application and research as the switch power technology of power electronics key areas.Switch power technology utilization switch converters carries out transformation of electrical energy, satisfies various electricity consumption requirements.Switching Power Supply has outstanding advantages such as volume is little, in light weight, efficient is high, power density is big, is widely used in fields such as computer, communication apparatus, electron detection device, battery charger.
Switching Power Supply mainly is made up of switch converters and controller two parts.Switch converters is called the power main circuit again, mainly contains Buck (step-down), Boost (boosting), Buck-Boost (buck), normal shock, instead swashs, various topological structures such as half-bridge, full-bridge.Traditional switch converters is usually operated at inductive current continuous conduction mode (CCM) and interrupted conduction mode (DCM).The CCM switch converters can transmit the more energy supply load, in, large-power occasions obtained extensive use.But, have shortcomings such as mapping is poor, the inductance volume is big, cost height because of it adopts bigger inductance value.The inductive current of DCM switch converters remains zero for some time in each switch periods, the average power that inductance stores and transmits is limited, is applicable to the small-power occasion.In sum, CCM and DCM switch converters all only are applicable to specific load or power bracket.Pseudo-continuous conduction mode (PCCM) switch converters has been taken into account the advantage of CCM and DCM switch converters, is applicable to wide load or broad power band.
Controller is used to monitor the operating state of switch converters, and produces control wave control switch pipe, and the energy of regulating supply load is with stable output.The control method of switch converters mainly contains control methods such as voltage-type, current mode, pulse train.In recent years; Increasing application scenario requires its power supply to have transient response speed fast; When between standby, dormancy, normal operation, switching like some microprocessors; Transient current speed is up to 130A/ us, and this just requires its power supply to have fast transient response speed to satisfy the demand of load.Traditional voltage type control implementation is simple, but its dynamic responding speed is slower, has been difficult to satisfy this demand of load.Novel pulse sequence control method is with controller generation high-energy control impuls or low-yield control impuls switching tube to be controlled, and has capability of fast response preferably.Its weak point is: adopt the time of afterflow of fixing reference current control PCCM switch converters continued flow switch pipe longer, transducer effciency is relatively poor, and when large-scale load or variable power, control system can lose stable or cisco unity malfunction.
Summary of the invention
The purpose of this invention is to provide a kind of PCCM switch converters self adaptation afterflow control method, make it to have simultaneously transient response speed and higher transducer effciency fast, be applicable to the PCCM switch converters of various topological structures.
The present invention is achieved in that provides a kind of PCCM switch converters self adaptation afterflow control method, it is characterized in that:
The inductive current of a, the pseudo-continuous conduction mode PCCM switch converters of detection is selected a sampling pulse signal, and inductive current is sampled/kept, and obtains the inductive current value, and multiply by variable coefficient, obtains first signal;
The output current of b, detection PCCM switch converters, and multiply by another variable coefficient, obtain secondary signal; First signal and secondary signal are sent into signal computing circuit simultaneously synthesizes; Its synthetic result is as the adaptive reference electric current; Adaptive reference electric current and inductive current are compared, control the conducting and the shutoff of PCCM switch converters continued flow switch pipe with this.
According to a kind of pseudo-continuous conduction mode PCCM switch converters self adaptation afterflow control method of the present invention, it is characterized in that: the adaptive reference electric current carries out signal operation by first signal and secondary signal and synthesizes.
The present invention provides a kind of device of realizing the control method of above-mentioned PCCM switch converters simultaneously, it is characterized in that: be made up of the first signal conditioning circuit FSC, secondary signal modulate circuit SSC, signal computing circuit SO, pulse signal producer PG and drive circuit DR; The described first signal conditioning circuit FSC is connected with pulse signal producer PG with signal computing circuit SO; Secondary signal modulate circuit SSC links to each other with signal computing circuit SO; Signal computing circuit SO is connected with pulse signal producer PG, and pulse signal producer PG links to each other with drive circuit DR.
According to device ACD of the present invention, it is characterized in that the described first signal conditioning circuit FSC is made up of current detection circuit CS1, sampling pulse generator SP, sampling/retainer SH, variable gain generator VG1 and multiplier MU1; Current detection circuit CS1, sampling/retainer SH, multiplier MU1 link to each other successively; Sampling pulse generator SP links to each other with sampling/retainer SH; Variable gain generator VG1 links to each other with multiplier MU1.
According to device ACD of the present invention, it is characterized in that described secondary signal modulate circuit SSC is made up of current detection circuit CS2, variable gain generator VG2 and multiplier MU2; Current detection circuit CS2 links to each other with multiplier MU2; Variable gain generator VG2 links to each other with multiplier MU2.
The invention has the advantages that:
One, compare with the control method of existing P CCM switch converters, PCCM switch converters output voltage ripple of the present invention is little, and the inductive current ripple is little, thereby has good steady-state behaviour.
Two, compare with the control method of existing P CCM switch converters; PCCM switch converters of the present invention is when load changes; The variation of output current changes the size of adaptive reference electric current immediately; Thereby dynamically control the afterflow value size and the time of afterflow length of the continued flow switch pipe of PCCM switch converters, when guaranteeing PCCM switch converters stability, improved the mapping and the efficient of PCCM switch converters.
Three, compare with the control method of existing P CCM switch converters; PCCM switch converters of the present invention is when input voltage changes; Inductive current changes immediately, has changed the size of adaptive reference electric current simultaneously, thereby dynamically controls the afterflow value size and the time of afterflow length of the continued flow switch pipe of PCCM switch converters; When guaranteeing PCCM switch converters stability, improved the mapping and the efficient of PCCM switch converters.
Four, controller is directly compared with the adaptive reference electric current with inductive current, need not compensating network, has simplified the design of control loop, and control is simple, has strengthened the stability of a system and dynamic response capability.
Description of drawings
Fig. 1 is the signal flow graph of the embodiment of the invention one method.
Fig. 2 is the signal flow graph of first signal conditioning circuit of the embodiment of the invention one.
Fig. 3 is the signal flow graph of the secondary signal modulate circuit of the embodiment of the invention one.
Fig. 4 is the circuit structure block diagram of the embodiment of the invention one.
Fig. 5 is in the embodiment of the invention one, concerns sketch map between inductive current, inductive current valley and the sampling pulse signal.
Fig. 6 a is the time-domain-simulation oscillogram of the embodiment of the invention one a certain period converter TD inductive current under limit.
Fig. 6 b is the time-domain-simulation oscillogram with Fig. 6 a converter TD of same period output voltage.
Fig. 7 a is the simulation waveform figure of embodiment one converter TD output voltage when load variations (load on 30ms constantly by 1.8A transition to 3.6A).
Fig. 7 b is for adopting the continued flow switch pipe S2 of existing pulse train control change device TD, the simulation waveform figure of output voltage when same load variations.
Fig. 8 a is the simulation waveform figure of embodiment one converter TD inductive current when load variations (load on 30ms constantly by 1.8A transition to 3.6A).
Fig. 8 b is for adopting the continued flow switch pipe S of existing pulse train control change device TD
2, the simulation waveform figure of inductive current when same load variations.
Fig. 9 is the circuit structure block diagram of the embodiment of the invention two.
Figure 10 is in the embodiment of the invention two, concerns sketch map between inductive current, inductive current peak and the sampling pulse signal.
Figure 11 is the circuit structure block diagram of the embodiment of the invention three.
Among the figure: 101, the first signal conditioning circuit FSC, 102, secondary signal modulate circuit SSC, 103, signal computing circuit SO, 104, pulse signal producer PG; 105, drive circuit DR, 201, current detection circuit CS1,202, sampling pulse generator SP; 203, sampling/retainer SH, 204, variable gain generator VG1,205, multiplier MU1; 301, current detection circuit CS2,302, variable gain generator VG2,303, multiplier MU2.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.The PCCM switch converters continued flow switch pipe S that the present invention relates to
2Control method and the device ACD, can with PCCM switch converters main switch S
1Any control method and the device PCD combine.The specific embodiments that is shown in the diagram only be as example with and will specify it hereinafter, should be as qualification.
Embodiment one
Illustrate like Fig. 1; Fig. 1 is the signal flow graph of the embodiment of the invention one method; Be specially a kind of PCCM switch converters TD self adaptation afterflow control method and device ACD thereof, its ACD device mainly is made up of the first signal conditioning circuit FSC101, secondary signal modulate circuit SSC102, signal computing circuit SO103, pulse signal producer PG104 and drive circuit DR105.The first signal conditioning circuit FSC101 is used to obtain inductive current information; Secondary signal modulate circuit SSC102 is used to obtain output current information; Inductive current information and output current information are sent into signal computing circuit SO103 simultaneously synthesize, obtain the adaptive reference electric current.In pulse signal producer PG104, adaptive reference electric current and inductive current are compared, produce the control corresponding pulse signal, control the conducting and the shutoff of the continued flow switch pipe of PCCM switch converters TD via drive circuit DR105 according to comparative result.
Illustrate like Fig. 2, the first signal conditioning circuit FSC of this example is made up of current detection circuit CS1201, sampling pulse generator SP202, sampling/retainer SH203, variable gain generator VG1204 and multiplier MU1205.Current detection circuit CS1201, sampling/retainer SH203, multiplier MU1205 link to each other successively; Sampling pulse generator SP202 links to each other with sampling/retainer SH203; Variable gain generator VG1204 links to each other with multiplier MU1205.
Illustrate like Fig. 3, this routine secondary signal modulate circuit SSC is made up of current detection circuit CS2301, variable gain generator VG2302 and multiplier MU2303.Current detection circuit CS2301 links to each other with multiplier MU2303; Variable gain generator VG2302 links to each other with multiplier MU2303.
This example adopts the device of Fig. 4, can realize above-mentioned control method easily and quickly.As shown in Figure 4, the device of the control method of the PCCM switch converters that this is routine is by converter TD, main switch S
1Control device PCD and continued flow switch pipe S
2Control device ACD form.Control device ACD comprises the first signal conditioning circuit FSC101, secondary signal modulate circuit SSC102, signal computing circuit SO103, pulse signal producer PG104 and drive circuit DR105.The first signal conditioning circuit FSC101, signal computing circuit SO103, pulse signal producer PG104, drive circuit DR105 link to each other successively; The first signal conditioning circuit FSC101 links to each other with pulse signal producer PG104; Secondary signal modulate circuit SSC102 links to each other with signal computing circuit SO103.
This its course of work of routine device and principle are:
Control device PCD adopts the course of work and the principle of pulse train control to be: as shown in Figure 4; Arbitrary switch periods zero hour; PCD detects the output voltage VO of converter TD; And compare with reference voltage V ref, its result is used to select the effective control impuls in this switch periods, thereby realizes main switch S
1Control.Effective selection way of its control impuls is: if VO, then selects duty ratio less than Vref is the high energy pulse control main switch S of DH
1Otherwise then selecting duty ratio is the low-yield pulse control main switch S of DL
1
Control device ACD adopts the course of work and the principle of self adaptation afterflow control to be: the first signal conditioning circuit FSC101 obtains inductive current information; Secondary signal modulate circuit SSC102 obtains output current information; Inductive current information and output current information are sent into signal computing circuit SO103 simultaneously, and to carry out add operation synthetic, obtains the adaptive reference electric current.In pulse signal producer PG104, adaptive reference electric current and inductive current are compared, produce the control corresponding pulse signal according to comparative result, via drive circuit DR105, control change device TD continued flow switch pipe S
2Conducting and shutoff.
In this example, the course of work of its first signal conditioning circuit FSC101 is: current detection circuit CS1201 obtains inductive current I from converter TD
L, sampling pulse generator SP202 produces a sampling pulse signal CLK; With inductive current I
LSend into sampling/retainer SH203 with sampling pulse signal CLK, obtain the valley I of inductive current
LV, inductive current I wherein
L, sampling pulse signal CLK and inductive current valley I
LVConcern that sketch map is as shown in Figure 5; Variable gain generator VG1204 produces gain coefficient K
1, and with inductive current valley I
LVSend into multiplier MU1205 together, obtain the first signal K
1I
LV, as the input of signal computing circuit SO103.
In this example, the course of work of its secondary signal modulate circuit SSC102 is: current detection circuit CS2301 obtains output current I from converter TD
oVariable gain generator VG2302 produces gain coefficient K
2, and with output current I
oSend into multiplier MU2303 together, obtain secondary signal K
2I
o, as another input of signal computing circuit SO103.
In this example, the adaptive reference electric current I
DcSynthetic method be: signal computing circuit SO103 is to the first signal K
1I
LVWith secondary signal K
2I
oIt is synthetic to carry out add operation, obtains I
Dc=K
1I
LV+ K
2I
o
Current detection circuit CS1201 obtains inductive current I from converter TD
L, sampling pulse generator SP202 produces a sampling pulse signal CLK
2With inductive current I
LWith sampling pulse signal CLK
2Send into sampling/retainer SH203, obtain the arbitrary value I of inductive current except that valley
2, variable gain generator VG1204 produces gain coefficient K
3, and with the arbitrary value I of inductive current except that valley
2Send into multiplier MU1205 together, obtain the first signal K
3I
2, as the input of signal computing circuit SO103.
This moment, the course of work of its secondary signal modulate circuit SSC102 was: current detection circuit CS2301 obtains output current I from converter TD
oVariable gain generator VG2302 produces gain coefficient K
4, and with output current I
oSend into multiplier MU2303 together, obtain secondary signal K
4I
o, as another input of signal computing circuit SO103.
At this moment, adaptive reference electric current I
DcSynthetic method be: signal computing circuit SO103 is to the first signal K
3I
2With secondary signal K
4I
oIt is synthetic to carry out computing, obtains I
Dc=K
3I
2+ K
4I
o
In this example, continued flow switch pipe S
2Control impuls Ps2 in pulse signal producer PG, produce, concrete producing method is: when each switch periods begins, main switch S
1Conducting, diode turn-off inductive current I
LBegin to rise, control impuls Ps2 is a low level; Main switch S
1Turn-off behind conducting set time DHT or the DLT, while diode current flow, inductive current IL begin to descend immediately.Work as I
LDrop to the adaptive reference electric current I
DcThe time, pulse signal producer PG makes control impuls Ps2 become high level by low level, continued flow switch pipe S
2Conducting, diode turn-off, and inductive current is through continued flow switch pipe S
2Afterflow finishes until current switch periods.
This routine converter TD is a PCCM Buck converter.
With PSIM software this routine method is carried out the time-domain-simulation analysis, the result is following.
Fig. 6 a and Fig. 6 b are respectively the inductive current I that emulation obtains
LAnd output voltage V
OWaveform.
Fig. 6 simulated conditions is following: input voltage vin=50V, output voltage reference value Vref=18V, inductance L=800uH, capacitor C=2000uF (its equivalent series resistance is 10m Ω), load resistance R=10 Ω, switch periods T=50 μ s; At converter TD continued flow switch pipe S
2Control device ACD in; Sampling pulse generator SP202 and sampling/retainer SH203 obtains the valley of inductive current; The gain coefficient K1=0.5 of variable gain generator VG1204, the gain coefficient K2=0.5 of variable gain generator VG2205, signal computing circuit SO103 uses add operation; At converter TD main switch S
1Control device PCD in, adopt pulse train control, wherein the duty ratio DH=0.48 of high energy pulse, low-yield duty of ratio DL=0.18.
As can beappreciated from fig. 6,3 switch periods are formed a cycle period, and its combining form is: 1 high 2 is low.In containing 1 switch periods of high energy pulse, the ON time of continued flow switch pipe is less; In containing 2 switch periods of low-yield pulse, the ON time of continued flow switch pipe is longer, but unequal.
Fig. 7 a is the simulation waveform figure of embodiment one converter output voltage when load variations (load on 30ms constantly by 1.8A transition to 3.6A).Fig. 7 b is for adopting the continued flow switch pipe S of existing pulse train control change device
2Fig. 7 simulated conditions is identical with Fig. 6.The simulation waveform figure of output voltage when same load variations.Visible by Fig. 7, when in device PCD, adopting identical control method, continued flow switch pipe S
2The PCCM switch converters that adopts pulse train control could get into new stable state through behind about 1.4ms after disturbance occurs, output voltage peak-to-peak value fluctuation 237mV; And under the same condition, adopt the inventive method to continued flow switch pipe S
2When controlling, the PCCM switch converters can get into new stable state rapidly, and the adjustment time is 0.6ms, output voltage peak-to-peak value fluctuation 207mV.So the transient response speed of the PCCM switch converters of the inventive method control is faster.
Fig. 8 a is the simulation waveform figure of embodiment one converter inductive current when load variations (load on 30ms constantly by 1.8A transition to 3.6A).Fig. 8 simulated conditions is identical with Fig. 7.Fig. 8 b is for adopting the continued flow switch pipe S of existing pulse train control change device
2, the simulation waveform figure of inductive current when same load variations.Visible by Fig. 8, when in device PCD, adopting identical control method, continued flow switch pipe S
2The PCCM switch converters that adopts pulse train control after disturbance occurs, in the adjustment process peak value of inductive current up to 6A, get into stable state again after inductive current afterflow value all greater than 4A, and time of afterflow is fixed; And under the same condition, adopt the inventive method to continued flow switch pipe S
2When controlling, the highest 5.5A that is about of the peak value of inductive current in the adjustment process gets into after the stable state inductive current afterflow value basically below 4A again, and the time of afterflow dynamic change.Because inductive current afterflow value is big more, time of afterflow is long more, will cause more losses, so the efficient of the PCCM switch converters of the inventive method control is higher.
Embodiment two
Like Fig. 9, shown in Figure 10, this example is basic identical with embodiment one, and difference is: the converter TD of this example control is PCCM Boost converter, and is as shown in Figure 9; That this routine sampling pulse generator SP202 and sampling/retainer SH203 obtain is inductive current peak I
LP, shown in figure 10.
Embodiment three
Shown in figure 11, this example is basic identical with embodiment one, and difference is: the converter TD of this example control is PCCM Buck-Boost converter, and is shown in figure 11.
The inventive method can realize with analogue device or digital device easily; The PCCM switch converters in can be used for above embodiment, also can be used for multiple circuit topologies such as PCCM forward converter, PCCM anti exciting converter, PCCM half-bridge converter, PCCM full-bridge converter.
Claims (5)
1. pseudo-continuous conduction mode switch converters self adaptation afterflow control method is characterized in that:
The inductive current of a, the pseudo-continuous conduction mode PCCM switch converters of detection is selected a sampling pulse signal, and inductive current is sampled/kept, and obtains the inductive current value, and multiply by variable coefficient, obtains first signal;
The output current of b, detection PCCM switch converters, and multiply by another variable coefficient, obtain secondary signal; First signal and secondary signal are sent into signal computing circuit simultaneously synthesizes; Its synthetic result is as the adaptive reference electric current; Adaptive reference electric current and inductive current are compared, control the conducting and the shutoff of PCCM switch converters continued flow switch pipe with this.
2. a kind of PCCM switch converters self adaptation afterflow control method according to claim 1 is characterized in that: the adaptive reference electric current carries out signal operation by first signal and secondary signal and synthesizes.
3. a device ACD who realizes the said pseudo-continuous conduction mode switch converters self adaptation afterflow control method of claim 1 is characterized in that: be made up of the first signal conditioning circuit FSC (101), secondary signal modulate circuit SSC (102), signal computing circuit SO (103), pulse signal producer PG (104) and drive circuit DR (105); The described first signal conditioning circuit FSC (101) is connected with pulse signal producer PG (104) with signal computing circuit SO (103); Secondary signal modulate circuit SSC (102) links to each other with signal computing circuit SO (103); Signal computing circuit SO (103) is connected with pulse signal producer PG (104), and pulse signal producer PG (104) links to each other with drive circuit DR (105).
4. device ACD according to claim 3; It is characterized in that the described first signal conditioning circuit FSC (101) is made up of current detection circuit CS1 (201), sampling pulse generator SP (202), sampling/retainer SH (203), variable gain generator VG1 (204) and multiplier MU1 (205); Current detection circuit CS1 (201), sampling/retainer SH (203), multiplier MU1 (205) link to each other successively; Sampling pulse generator SP (202) links to each other with sampling/retainer SH (203); Variable gain generator VG1 (204) links to each other with multiplier MU1 (205).
5. device ACD according to claim 3 is characterized in that, described secondary signal modulate circuit SSC (102) is made up of current detection circuit CS2 (301), variable gain generator VG2 (302) and multiplier MU2 (303); Current detection circuit CS2 (301) links to each other with multiplier MU2 (303); Variable gain generator VG2 (302) links to each other with multiplier MU2 (303).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103441668A (en) * | 2013-08-26 | 2013-12-11 | 华南理工大学 | High-gain boost DC-DC converter allowing pseudo continuous work |
| CN106230260A (en) * | 2016-09-27 | 2016-12-14 | 武汉大学 | A kind of pseudo-continuous conduction mode Buck changer gradient reference current control system and method |
| CN106464135A (en) * | 2014-01-07 | 2017-02-22 | 恩都冉科技 | A switched power stage and a method for controlling the latter |
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| CN101505098A (en) * | 2008-12-31 | 2009-08-12 | 西南交通大学 | Multi-stage pulse sequence control method of pseudo-continuous working mode and apparatus thereof |
| CN101552547A (en) * | 2009-01-14 | 2009-10-07 | 西南交通大学 | Pseudo-continuous work mode switch power supply power factor correcting method and device thereof |
| CN101557168A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Multi-frequency control method of quasicontinuous working model switch power supply and device thereof |
| CN101777832A (en) * | 2010-01-19 | 2010-07-14 | 西南交通大学 | Single-loop pulse regulating and controlling method and device of pseudo continuous mode switch power supply |
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| CN101505098A (en) * | 2008-12-31 | 2009-08-12 | 西南交通大学 | Multi-stage pulse sequence control method of pseudo-continuous working mode and apparatus thereof |
| CN101552547A (en) * | 2009-01-14 | 2009-10-07 | 西南交通大学 | Pseudo-continuous work mode switch power supply power factor correcting method and device thereof |
| CN101557168A (en) * | 2009-02-25 | 2009-10-14 | 西南交通大学 | Multi-frequency control method of quasicontinuous working model switch power supply and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103441668A (en) * | 2013-08-26 | 2013-12-11 | 华南理工大学 | High-gain boost DC-DC converter allowing pseudo continuous work |
| CN106464135A (en) * | 2014-01-07 | 2017-02-22 | 恩都冉科技 | A switched power stage and a method for controlling the latter |
| CN106464135B (en) * | 2014-01-07 | 2019-03-15 | 朝阳半导体技术江阴有限公司 | Power switched grade and method for controlling the power switched grade |
| CN106230260A (en) * | 2016-09-27 | 2016-12-14 | 武汉大学 | A kind of pseudo-continuous conduction mode Buck changer gradient reference current control system and method |
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| CN102624206B (en) | 2014-05-07 |
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