CN102263501A - Control method and controller - Google Patents
Control method and controller Download PDFInfo
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- CN102263501A CN102263501A CN2010101947532A CN201010194753A CN102263501A CN 102263501 A CN102263501 A CN 102263501A CN 2010101947532 A CN2010101947532 A CN 2010101947532A CN 201010194753 A CN201010194753 A CN 201010194753A CN 102263501 A CN102263501 A CN 102263501A
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- switch
- electric current
- current
- signal
- opening time
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Abstract
The invention provides a control method and a controller which are applicable to a power supply. The power supply comprises a switch and an inductive component which are connected in series. When the switch is turned on, the inductive current of the inductive component can be increased; the inductive current flowing through the inductive component can be detected so as to generate a current detection signal; the current detection signal and a conditioning signal are aggregated to generate an aggregation signal; the aggregation signal is compared with a peak limited value; when the aggregation signal approximately exceeds the peak limited value, the switch is turned off; and an open time or duty cycle of the switch is detected and the conditioning signal can be updated according to the detected open time or duty cycle.
Description
Technical field
The invention relates to a kind of switch type power supplying device (Switched-mode power supply, overcurrent protection SMPS) (over current protection, OCP) method and relevant device.
Background technology
Power supply unit is a kind of electric power controller, is used for conversion electric power, to provide power supply to electronic installation or element.For instance, Fig. 1 is a known power supply unit 60, has flyback framework (flyback topology).Bridge rectifier 62 rectifications AC power V
AC, input power supply V is provided
INTo transformer 64.During switch 72 short circuits (close), the first side winding L of transformer 64
PEnergy storage; During open circuit (open), the secondary side winding L of transformer 64
SBy rectifier 66 release can to load capacitance (loadcapacitor) 69 to set up out-put supply V
OUTError amplifier (error amplifier) EA is out-put supply V relatively
OUTVoltage and target voltage V
Target, and produce compensating signal V
COMController 74 is according to compensating signal V
COMAnd current detection signal V
CS, with control signal V
GATEControl switch 72.Current detection signal V
CSReaction stream is through first side winding L
PInductive current.
The controller 74 of Fig. 2 illustration Fig. 1.Clock generator 76 periodically makes logical block 79 open switch 72.Comparator 77 and 78 is current limit detection signal V roughly
CSPeak value roughly be no more than a peak value limit value V
CS-LIMITWith compensating signal V
COMVoltage in smaller value.Overcurrent protection is reached by comparator 78 and logical block 79, wishes to make current detection signal V
CSPeak value can not surpass peak value limit value V
CS-LIMIT
But comparator 78 is found current detection signal V
CSUp to peak value limit value V
CS-LIMIT, arranged segment signal time of delay to real off switch 72.This segment signal is in time of delay, current detection signal V
CSCan raise constantly.Therefore, current detection signal V
CSTend to be higher than peak value limit value V
CS-LIMIT, and the voltage Δ V that exceeds can be along with input power supply V
INVoltage different and different results arranged.Such difference for instance, can make power supply unit 60 at difference input power supply V
INDuring voltage, have different out-put supply V
OUTPeak power output.This is beyond affordability for system designer.
Summary of the invention
The embodiment of the invention provides a kind of control method, is applicable to a power supply unit.This power supply unit includes a switch and an inductance element of polyphone.This switch is unlocked, and increases the inductive current of this inductance element.The inductive current of this inductance element of flowing through is detected, to produce a current detection signal.Add up this current detection signal and and adjust signal, produce one and add resultant signal.Relatively this adds a resultant signal and a peak value limit value.When this adds resultant signal approximately above this peak value limit value, close this switch.Detect an opening time or the responsibility cycle of this switch, and upgrade this adjustment signal according to this.
The embodiment of the invention provides a kind of controller, is applicable to a power supply unit.This power supply unit includes a switch and an inductance element of polyphone.This controller includes a logic processing device, a comparator and a current generator.This logic processing device is in order to open this switch.When the voltage of a test side exceeded a peak value limit value, this comparator was closed this switch.According to the opening time or the responsibility cycle of this switch, this current generator produces one and adjusts electric current, flow to an end of this switch by this test side.When this opening time or responsibility cycle increase, this is adjusted electric current and reduces.This adjusts electric current when this opening time or responsibility cycle, is approximately certain value.
Description of drawings
Fig. 1 is a known power supply unit.
Fig. 2 is the controller among Fig. 1.
Fig. 3 is according to a power supply unit of the invention process.
Fig. 4 is the controller among Fig. 3.
Fig. 5 has shown limits value I
CS-LIMITWith opening time T
ONRelation, and two different input power supply V
INUnder inductive current I
P
Fig. 6 illustration the current generator among Fig. 4.
[main element label declaration]
| 60、90 | Power supply unit |
| 62 | Bridge rectifier |
| 64 | Transformer |
| 66 | Rectifier |
| 69 | Load capacitance |
| 72 | Switch |
| 74、80 | Controller |
| 76 | Clock generator |
| 77、78 | Comparator |
| 79 | Logical block |
| 82 | Current generator |
| 84 | Current mirror |
| 86、88 | Constant current source |
| 89 | Electric capacity |
| C ：LIMIT | Curve |
| CS | Detect resistance |
| EA | Error amplifier |
| FCS | Adjust resistance |
| GM | The transduction comparator |
| I CS-LIMIT | Limits value |
| I CS-OUT | Adjust electric current |
| I CTL | Electric current |
| I SET、I EXP | Decide electric current |
| I P | Inductive current |
| L P | First side winding |
| L S | Secondary side winding |
| S 1、S 2 | Lines |
| SS | The test side |
| T ON | Opening time |
| V AC | AC power |
| V COM | Compensating signal |
| V CS | Current detection signal |
| V CS-LIMIT | The peak value limit value |
| V CTL | Control voltage |
| V FCS | Adjust signal |
| V GATE | Control signal |
| V IN | The input power supply |
| V OUT | Out-put supply |
| V REF | Default value |
| V Target | Target voltage |
Embodiment
Fig. 3 is according to a power supply unit 90 of the invention process, the controller 80 among Fig. 4 illustration Fig. 3.Among Fig. 3 and Fig. 4, represent same or analogous element, device or signal, be known technology, do not add tired stating at this with label identical among Fig. 1,2 of known technology.Fig. 3 and 4 only is an embodiment, implements the present invention and must use same or analogous element, device or signal in Fig. 1 and 2.Interest field of the present invention should be read as restriction with claim.
Different with Fig. 1, among Fig. 3, be connected with between the test side SS of controller 80 and the detection resistance CS and adjust resistance FCS.Different with Fig. 2, among Fig. 4, controller 80 has current generator 82, and the adjustment electric current I is provided
CS-OUT,, flow through and adjust resistance FCS and detect resistance CS by the test side.The controller 80 of Fig. 4 can be implemented with an integrated circuit, and it is connected with adjustment resistance FCS's, can pass through an IC bond (pin).
By control signal V
GATE, the opening time of current generator 82 sense switches 72 (ON time) T
ONOr responsibility cycle (Duty cycle) D, adjust electric current I to upgrade
CS-OUT, wherein responsibility cycle D is opening time T
ONDivided by whole switch periods.Adjust electric current I
CS-OUTValue, when switch 72 was opened, big appointment maintained a constant definite value.Can provide a feedback mechanism in the current generator 82, electric current I is once adjusted in a switch periods change
CS-OUT, make opening time T
ONOr responsibility cycle D and adjustment electric current I
CS-OUTRoughly be inverse ratio.For instance, 72 opening time of the switch in switch periods T
ONOr responsibility cycle D just reduces the adjustment electric current I of next switch periods when becoming big
CS-OUT
Upgrade and adjust electric current I
CS-OUTUpgraded the first side winding L that flows through in the equivalence
PInductive current I
PLimits value I
CS-LIMIT, it is for triggering the inductive current value of OCP.Please consult Fig. 3 and Fig. 4 together.The condition that comparator 78 is triggered is that the voltage of test side approximates peak value limit value V greatly
CS-LIMIT, shown in following formula (1):
V
CS-LIMIT＝V
FCS+V
CS ....(1)
Wherein, V
FCSWith V
CSBeing respectively and adjusting resistance FCS and the cross-pressure that detects resistance CS, also is respectively an adjustment signal and a current detection signal.The voltage of test side approximately is exactly to adjust signal V
FCSAnd current detection signal V
CSVoltage add up.Suppose the resistance value R that adjusts resistance FCS
FCSMuch larger than the resistance value R that detects resistance CS
CS, then formula (1) can approximately be put in order and be:
V
CS-LIMIT＝I
CS-OUT*R
FCS+I
CS-LIMIT*R
CS
I
CS-LIMIT＝(V
CS-LIMIT-I
CS-OUT*R
FCS)/R
CS ...(2)
Suppose the adjustment electric current I
CS-OUTWith opening time T
ONInverse relation be
I
CS-OUT*T
ON＝K ...(3)
Wherein K is a constant.Then formula (2) can become
I
CS-LIMIT＝(V
CS-LIMIT/R
CS)-K*R
FCS/(R
CS*T
ON)...(4)
In the formula (4), K*R
FCS/ (R
CS* T
ON) can be considered as the amount of deleting, in order to reduce peak value limit value V
CS-LIMITCorresponding primary current limit value (V
CS-LIMIT/ R
CS), begin to limit inductive current I ahead of time
PCurve C among Fig. 5
: LIMITIllustration limits value I in the formula (4)
CS-LIMITWith opening time T
ONRelation.Lines S among Fig. 5
1With S
2Two different input power supply V have also been shown
INUnder inductive current I
P, lines S wherein
1Pairing input power supply V
INThan higher, so opening time T
ONShorter, limits value I
CS-LIMITBe smaller I
P1As shown in Figure 5, as long as suitably choose R
FCS, might be able to allow inductive current I
PPeak value, not along with input power supply V
INChange, be fixed on about primary current limit value V
CS-LIMIT/ R
CS, solved the problem that caused signal delay time, in addition, more than in the formula of being derived and the explanation, all can replace opening time T by responsibility cycle D
ON
Fig. 6 illustration the current generator 82 among Fig. 4.Constant current source 86 provides decides electric current I
SETTo electric capacity 89 chargings; Constant current source 88 provides decides electric current I
EXP, only at control signal V
GATEBe " 1 " in logic, when just switch 72 is opened, to electric capacity 89 discharges.When switch 72 is opened, control voltage V
CTL, it has determined electric current I
CTLWith decide electric current I
EXP, be maintained a definite value haply.84 of current mirrors (currentmirror) make the adjustment electric current I
CS-OUTApproximately with electric current I
CTLEqual proportion.By circuit analysis as can be known, Fig. 6 has realized following formula (5).
I
SET*T
CYCLE＝I
EXP*T
ON?...(5)
Wherein, T
CYCLESwitch periods for switch 72.For instance, after a switch periods, if voltage V greater than the right side, is controlled in the left side of formula (5)
CTLJust can rise, and then increase electric current I
CTLAnd decide electric current I
EXPControl voltage V
CTLTo deciding electric current I
EXPSuch feedback path can allow the left and right sides of formula (5) be tending towards about equally.Formula (5) can be derived the adjustment electric current I
CS-OUTWith opening time T
ONRelation, shown in following formula (6):
I
CS-OUT＝K
1*I
CTL＝K
2*I
EXP＝K
3*I
SET*T
CYCLE/T
ON ...(6)
If represent that with responsibility cycle D formula (6) can be rewritten as:
I
CS-OUT＝K
3*I
SET/D ...(7)
Wherein, decide electric current I
SETWith T
CYCLEWhen being definite value, significantly, adjust electric current I
CS-OUTJust with opening time T
ONOr responsibility cycle D approximately is inversely proportional to.
Adjust electric current I
CS-OUTShould be to take place, when just power supply unit is in heavy duty, just need to produce at OCP.So transduction comparator GM can be used as a control unit, by detecting compensating signal V
COM, whether decision produces the adjustment electric current I
CS-OUTIn Fig. 6, as compensating signal V
CIMBe lower than default value V
REFThe time, can be considered as underloading or no-load, adjust electric current I
CS-OUTWill stop, becoming 0, so limits value I
CS-LIMITJust can not be subjected to opening time T
ONOr the variation of responsibility cycle D and influencing.
Among the embodiment of Fig. 4, by triggering restriction inductive current I ahead of time
P, attempt solving signal delay time the problem that may cause.System manufacturer can determine the effect that it may reach by selecting a suitable external adjustment resistance FCS.
Though the present invention is an example with the SMPS of a flyback framework, the present invention also goes for similarly SMPS such as step-down power converter, booster power transducer.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a control method is applicable to a power supply unit, and it includes a switch and an inductance element of polyphone, and this method includes:
Open this switch, increase the inductive current of this inductance element;
The flow through inductive current of this inductance element of detection is to produce a current detection signal;
This current detection signal and one is adjusted signal add up, produce one and add resultant signal;
Relatively this adds a resultant signal and a peak value limit value, when this adds resultant signal approximately above this peak value limit value, closes this switch; And
Detect an opening time or the responsibility cycle of this switch, and upgrade this adjustment signal according to this.
2. control method according to claim 1, wherein, this power supply unit also includes a detection resistance and is connected between this switch and the power line, and one adjusts resistance, have one first end and be connected to this switch and this detection resistance, this control method includes:
Provide one to adjust electric current, this adjustment resistance of flowing through, this adjustment electric current approximately remains unchanged when this switch open;
When the voltage of one second end of this adjustment resistance exceeds this peak value limit value, close this switch; And
According to this opening time or responsibility cycle, change this adjustment electric current.
3. control method according to claim 2 also includes:
When this opening time or responsibility cycle increase, reduce this adjustment electric current.
4. control method according to claim 1 also includes:
Deciding electric current with one first charges to an electric capacity;
With one second decide electric current in this opening time or responsibility cycle to this capacitor discharge; And
According to the voltage of this electric capacity, adjust this and second decide electric current and this adjustment electric current.
5. control method according to claim 1 also includes:
One compensating signal is provided, reacts an output voltage of this power supply unit; And
When this compensating signal is lower than a default value, stop to provide this adjustment signal.
6. a controller is applicable to a power supply unit, and a switch and an inductance element that it includes polyphone include:
One logic processing device is in order to open this switch;
One comparator when the voltage of a test side exceeds a peak value limit value, is closed this switch; And
One current generator according to an opening time or the responsibility cycle of this switch, produces one and adjusts electric current, flow to an end of this switch by this test side, and when this opening time or responsibility cycle increased, this was adjusted electric current and reduces;
Wherein, this adjusts electric current when this opening time or responsibility cycle, is approximately certain value.
7. controller according to claim 6, this power supply unit also includes:
One detects resistance, is connected between this switch and the power line; And
One adjusts resistance, is connected between this detection resistance and this test side.
8. controller according to claim 6, wherein, this current generator provides a feedback mechanism, makes this adjustment electric current and this opening time or responsibility cycle, approximately is inverse ratio.
9. controller according to claim 6, wherein, this current generator includes:
One control unit when a compensating signal is lower than a default value, stops this adjustment electric current;
Wherein, this compensating signal reacts an output voltage of this power supply unit.
10. controller according to claim 6, wherein, this current generator includes:
One first constant current source charges to an electric capacity;
One second constant current source, when this is opened to this capacitor discharge; And
One feedback path according to the voltage of this electric capacity, changes the electric current of this second constant current source;
Wherein, this adjusts current ratio in the electric current of this second constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010194753.2A CN102263501B (en) | 2010-05-31 | 2010-05-31 | Control method and controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010194753.2A CN102263501B (en) | 2010-05-31 | 2010-05-31 | Control method and controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102263501A true CN102263501A (en) | 2011-11-30 |
| CN102263501B CN102263501B (en) | 2014-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010194753.2A Active CN102263501B (en) | 2010-05-31 | 2010-05-31 | Control method and controller |
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| TWI551021B (en) * | 2015-11-25 | 2016-09-21 | 財團法人金屬工業研究發展中心 | Flyback power converter and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1630175A (en) * | 2003-12-19 | 2005-06-22 | 夏普株式会社 | Switching power supply apparatus and electric appliance therewith |
| US20100008106A1 (en) * | 2008-07-09 | 2010-01-14 | Panasonic Corporation | Switching control circuit, semiconductor device and switching power source apparatus |
| CN101662223A (en) * | 2009-09-24 | 2010-03-03 | 上海导向微电子有限公司 | System and method for compensating maximum output power of switching power supply |
-
2010
- 2010-05-31 CN CN201010194753.2A patent/CN102263501B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1630175A (en) * | 2003-12-19 | 2005-06-22 | 夏普株式会社 | Switching power supply apparatus and electric appliance therewith |
| US20100008106A1 (en) * | 2008-07-09 | 2010-01-14 | Panasonic Corporation | Switching control circuit, semiconductor device and switching power source apparatus |
| CN101662223A (en) * | 2009-09-24 | 2010-03-03 | 上海导向微电子有限公司 | System and method for compensating maximum output power of switching power supply |
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| Publication number | Publication date |
|---|---|
| CN102263501B (en) | 2014-10-22 |
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