CN203352424U - Fixed turn-off time peak current type impulse sequence control device - Google Patents
Fixed turn-off time peak current type impulse sequence control device Download PDFInfo
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- CN203352424U CN203352424U CN 201320342393 CN201320342393U CN203352424U CN 203352424 U CN203352424 U CN 203352424U CN 201320342393 CN201320342393 CN 201320342393 CN 201320342393 U CN201320342393 U CN 201320342393U CN 203352424 U CN203352424 U CN 203352424U
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- sequence control
- inductive current
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Abstract
The utility model discloses a fixed turn-off time peak current type impulse sequence control device of a switching converter, the length of a turn-off time in a switching period is determined by an output voltage magnitude detected at a start time of the switching period, and a turn-on time of a switching tube is codetermined by an inductance current and a limited value of the inductance current. The fixed turn-off time peak current type impulse sequence control device can be applied to DCM and CCM switching converters and is advantaged by stable and reliable control and a current limiting function, and possible low-frequency fluctuation of impulse sequence control can be eliminated completely.
Description
Technical field
The utility model relates to electronic switching device, especially the switch converters control device.
Background technology
Switch converters is a kind of energy converter, and it will input energy through proper transformation, is converted to and is applicable to the energy that output requires.Switch converters has the outstanding advantages such as volume is little, lightweight, conversion efficiency is high, power density is large because of it, and is used widely in actual life.In daily life, the switch converters ubiquity, as computer adapter, battery charger etc.Switch converters consists of power inverter main circuit and control circuit two parts thereof, and main circuit completes energy conversion and transmission, and control circuit guarantees that the stable operation of main circuit and energy conversion can meet the output requirement.For same main circuit, adopt different control circuits to exert an influence to aspects such as the stable state of system and mappings, thereby seem and become more and more important for the research of control method.
It is a kind of new control technology proposed in recent years that pulse train is controlled, it have circuit realize simple, without error amplifier and corresponding compensating network thereof, transient response speed is fast and the outstanding advantages of strong robustness, is highly suitable for the switch converters control system higher to reliability requirement.At present, pulse train is controlled and is mainly used in switch converters discontinuous current mode conduction mode (DCM) application scenario.For the DCM application scenario, the switch converters power output is seriously limited.Therefore, be necessary the pulse train control technology is extended to continuous current mode conduction mode (CCM).When pulse train control is applied to the CCM switch converters, existing research shows, because pulse train is controlled by inductive current indirect regulation output voltage, thereby makes controller have hysteresis quality to the adjusting of output voltage, cause output voltage the low-frequency fluctuation phenomenon to occur, the steady-state behaviour variation.The basic reason that produces this phenomenon is, in each switch periods, the inductive energy storage variable quantity is non-vanishing, and it will participate in energy transfer process, thereby causes the output voltage vibration.Increase output capacitance equivalent series resistance (ESR) and can suppress this oscillatory occurences, but, along with the increase of output capacitance ESR value, output voltage ripple increases equally.
The utility model content
The purpose of this utility model provides implement device for fixing turn-off time peak electricity flow pattern pulse sequence control method.Its concrete scheme is:
Fixedly turn-off time peak electricity flow pattern pulse-sequence control device, be comprised of voltage range determining device QJ, turn-off time timer GD, inductive current transducer DG, comparator, rest-set flip-flop and drive circuit; The voltage range determining device is connected with the turn-off time timer, to determine the corresponding turn-off time, inductive current transducer and inductive current limit value are connected to comparator input terminal, and comparator output terminal is connected with rest-set flip-flop, rest-set flip-flop output driving circuit connecting valve pipe, the control switch break-make.
The inductive current limit value is the fixed value of directly setting in advance or exports to switch converters the value that feedback information (as the load current feedback amount) is relevant.
Adopt device of the present utility model: at any switch periods sampling and outputting voltage zero hour, and the residing voltage range of the difference of output voltage and reference voltage is judged, and select the turn-off time of corresponding set time as this switch periods according to judged result, after fixing turn-off time finishes, switching tube is open-minded, and inductive current starts to rise, when inductive current rises to the inductive current limit value, switching tube turn-offs, and starts next switch periods.After adopting this working method, inductive current starts and all the equating of the finish time in switch periods, and the variable quantity of inductive energy storage in a switch periods is zero, thereby can avoid pulse train to control the generation of CCM switch converters low-frequency fluctuation phenomenon.
Compared with prior art, the beneficial effects of the utility model are: control reliable and stablely, have the electric current attributive function, can work in DCM and CCM application scenario, and can eliminate pulse train from root and control the low-frequency fluctuation phenomenon that may exist.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The accompanying drawing explanation
Fig. 1 is the utility model implement device structured flowchart.
Fig. 2 is the electrical block diagram that the utility model practices.
Fig. 3 is the groundwork waveform schematic diagram that the utility model practices circuit.
Fig. 4 is for adopting the Buck converter static Simulation result with same circuits parameter of the control of bifrequency pulse train and the utility model device.
In Fig. 4: output voltage and inductive current waveform while (a) adopting bifrequency pulse train to control; (b) output voltage and inductive current waveform during for employing the utility model device.
Embodiment
Fig. 1 illustrates, concrete enforcement structure of the present utility model is: switch converters is turn-off time peak electricity flow pattern pulse-sequence control device fixedly, voltage range determining device, turn-off time timer, inductive current transducer, comparator, rest-set flip-flop and drive circuit, consists of.The voltage range determining device is judged the residing voltage range of the difference of output voltage and reference voltage, to control the turn-off time timer, thereby determine the turn-off time in the current control impuls cycle, after fixing turn-off time finishes, rest-set flip-flop set, the rest-set flip-flop output signal is the conducting of control switch pipe after drive circuit, the inductive current transducer detects inductive current, when inductive current rises to the inductive current limit value, the upset of comparator output level, rest-set flip-flop resets, and switching tube turn-offs.
Fig. 2 has provided the application of the utility model in the Buck switch converters, and specific works principle and groundwork waveform can be with reference to figure 3.By the known specific works principle of the present utility model of Fig. 2, Fig. 3 and process, be: in any switch periods zero hour, the voltage range determining device is to output voltage V
ovoltage range of living in is judged (Fig. 3 example has only provided four voltage ranges, during practical application, can suitably increase or reduce voltage range quantity according to practical situation).When output voltage in voltage range (0, V
ref-V
e) time, turn-off time timer timing is T
off1, when output voltage in voltage range (V
ref-V
e, V
ref) time, turn-off time timer timing is T
off2, when output voltage in voltage range (V
ref, V
ref+ V
e) time, turn-off time timer timing is T
off3, and work as output voltage in voltage range (V
ref+ V
e,+∞) time, turn-off time timer timing is T
off4, be wherein V
refreference voltage, V
efor voltage range is divided boundary value, and each fixedly the turn-off time meets T
off1<T
off2<T
off3<T
off4.When switching tube SW turn-offs, inductive current i
ldescend, after fixing turn-off time finishes, rest-set flip-flop set end S end level is effective, rest-set flip-flop set, and switching tube SW conducting, the inductive current rising, when inductive current rises to inductive current limit value I
limthe time, rest-set flip-flop reset terminal R end level is effective, and rest-set flip-flop resets, and switching tube SW turn-offs again, and next switch periods starts.
Analysis of simulation result:
Fig. 4 is for adopting Psim software to adopting Buck converter stable state output voltage and the inductive current simulation result with same circuits parameter of the control of bifrequency pulse train and the utility model device.Careful comparison diagram 4 (a) and (b) time transverse axis and the electric current and voltage longitudinal axis can be found out, when adopting bifrequency pulse train to control, the agglomerating appearance of high and low frequency control impuls, large vibration appears in output voltage and inductive current, be that the low-frequency fluctuation phenomenon appears in converter, and while adopting the utility model control device, the low-frequency fluctuation phenomenon as shown in Fig. 4 (a) disappear, output voltage and inductive current have very little ripple, and converter can steady operation.Can find out by Fig. 4 (a) with (b) advantage that the utility model control device exists than the bifrequency pulse-sequence control device.Simulated conditions: input voltage V
in=15V, output voltage V
o=5V, inductance L=100 μ H, capacitor C=470 μ F, capacitor equivalent series resistance ESR=5m Ω, load resistance R=1 Ω, the bifrequency pulse train control height frequency control impuls cycle is respectively 7.5 μ s and 15 μ s, and ON time is 3.5 μ s, and while adopting the utility model device, fixedly the turn-off time is respectively 5 μ s and 10 μ s, inductive current limit value I
lim=5.2A, in order to simplify, only be divided into by output voltage two voltage ranges that are greater than and are less than reference voltage in simulated example.
Claims (1)
1. fixing turn-off time peak electricity flow pattern pulse-sequence control device, be comprised of voltage range determining device QJ, turn-off time timer GD, inductive current transducer DG, comparator, rest-set flip-flop and drive circuit; It is characterized in that, the voltage range determining device is connected with the turn-off time timer, to determine the corresponding turn-off time, inductive current transducer and inductive current limit value are connected to comparator input terminal, comparator output terminal is connected with rest-set flip-flop, rest-set flip-flop output driving circuit connecting valve pipe, the control switch break-make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320342393 CN203352424U (en) | 2013-06-14 | 2013-06-14 | Fixed turn-off time peak current type impulse sequence control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320342393 CN203352424U (en) | 2013-06-14 | 2013-06-14 | Fixed turn-off time peak current type impulse sequence control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203352424U true CN203352424U (en) | 2013-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320342393 Expired - Fee Related CN203352424U (en) | 2013-06-14 | 2013-06-14 | Fixed turn-off time peak current type impulse sequence control device |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021035642A1 (en) * | 2019-08-29 | 2021-03-04 | 杭州士兰微电子股份有限公司 | Switching converter, and control method and control circuit therefor |
-
2013
- 2013-06-14 CN CN 201320342393 patent/CN203352424U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021035642A1 (en) * | 2019-08-29 | 2021-03-04 | 杭州士兰微电子股份有限公司 | Switching converter, and control method and control circuit therefor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131218 Termination date: 20160614 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |