CN103066868A - Primary side control method and power controller - Google Patents
Primary side control method and power controller Download PDFInfo
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- CN103066868A CN103066868A CN2011103195402A CN201110319540A CN103066868A CN 103066868 A CN103066868 A CN 103066868A CN 2011103195402 A CN2011103195402 A CN 2011103195402A CN 201110319540 A CN201110319540 A CN 201110319540A CN 103066868 A CN103066868 A CN 103066868A
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Abstract
The invention provides a primary side control method and a power controller. The power controller comprises a comparator and an opening and triggering controller. The comparator compares feedback voltage and an overhigh voltage reference value. The feedback voltage can represent secondary side voltage of a secondary side winding through an inductive coupling function. The opening and triggering controller is connected on the comparator through a coupling. When the feedback voltage is lower than the overhigh voltage reference value, the opening and triggering controller enables a power switch to approximately operate in a first switching frequency. When the feedback voltage is higher than the overhigh voltage reference value, the opening and triggering controller enables the power switch to approximately operate in a second switching frequency. The second switching frequency is lower than the first switching frequency.
Description
Technical field
The present invention relates to the switch type power supplying device (switching-mode power supply) of primary side control, particularly relate to about reducing the primary side switch formula power supply unit of output voltage shake.
Background technology
Power supply unit is the essential a kind of electronic installation of most electronic product, is used for converting battery or civil power to specific standard is asked and had to required by electronic product power supply.In numerous power supply units, the switch type power supplying utensil has superior energy conversion efficiency and small and exquisite small product size, so welcome by the power supply industry.
At present in the switch type power supplying device, two kinds of different control modes are arranged: primary side (primary side) control (primary side control, PSC) and primary side (secondary side) control (secondary side control, SSC).SSC directly couples testing circuit at the output that a primary side winding of a power supply unit is exported, then by optical coupler (photo coupler), testing result is sent to the power-supply controller of electric that is positioned at primary side, uses this power supply unit of control and will store and the energy of changing at the primary side winding.With respect to SSC, PSC is by the reflected voltage of direct-detection on an auxiliary winding, indirectly detects the voltage that the primary side winding is exported, and has also indirectly finished the output voltage that detects an output of power supply unit.The detection of PSC and the control of switching energy are all finished in primary side.Compared to SSC, PSC may relatively save cost, because do not need all larger optical couplers of volume and expense; The PSC conversion efficiency may be higher, because not at the fixing testing circuit of power consumption of primary side.
Fig. 1 is a kind of existing switch type power supplying device, adopts PSC.Bridge rectifier (bridge rectifier) 20 sets up out the input power of direct current to alternating current (alternative current) rectification that mains terminal AC comes in input IN.The voltage V of input power
INMay have M shape waveform, also may be filtered into roughly time-independent certain value.Transformer has three windings: primary side winding PRM, primary side winding SEC and auxiliary winding AUX.Power-supply controller of electric 26 is by drive end GATE, and periodically the power ratio control switch 34.When power switch 34 was opened, primary side winding PRM carried out energy storage.When power switch 34 was closed, primary side winding SEC and auxiliary winding AUX released energy, to be based upon the output voltage V on the output OUT
OUTGive load 24 and operating voltage V
CCGive power-supply controller of electric 26.
Fig. 2 shows power-supply controller of electric 26 and some outer members among Fig. 1.Power-supply controller of electric 26 includes sampler 12, pulse generator 14, transducer (transconductor) 15 and pulse width controller 16.Primary side winding SEC and auxiliary winding AUX release can the time, pulse generator 14 offers sampler 12 1 short pulses, makes 12 pairs of feedback voltage of sampler V
FBSampling is to produce feedback voltage V at intermediate ends IFB
IFBFeedback voltage V
IFBBy feedback end FB, divider resistance 28 and 30, auxiliary winding AUX, be equal to the primary side winding voltage V that has represented primary side winding SEC
SECVoltage when discharge has also approximately represented output voltage V
OUTTransducer (transconductor) 15 is according to feedback voltage V
IFBWith target voltage V
REFComparative result, come the bucking voltage V on the control and compensation end COMP
COM Pulse width controller 16 is according to bucking voltage V
COMCome power ratio control switch 34.Generally, power-supply controller of electric 26 provides a feedback mechanism, makes feedback voltage V
IFBApproximately be stabilized in target voltage V
REFSo, also just can stablize output voltage V
OUT
Summary of the invention
Embodiments of the invention provide a kind of primary side control method, include: a feedback voltage is provided, and this feedback voltage can represent a secondary-side voltage of a primary side winding by an inductance coupling high effect; Control a power switch with one first switching frequency; Relatively this feedback voltage and one is crossed the high pressure reference value; And, when this feedback voltage is crossed the high pressure reference value above this, control this power switch with one second switching frequency.This second switching frequency is lower than this first switching frequency.
Embodiments of the invention provide a kind of power-supply controller of electric, are applicable to primary side control.Power-supply controller of electric includes a comparator and and opens trigger controller.This comparator, relatively a feedback voltage and one is crossed the high pressure reference value.This feedback voltage can represent a secondary-side voltage of a primary side winding by an inductance coupling high effect.This unlatching trigger controller is coupled to this comparator.Cross the high pressure reference value when this feedback voltage is lower than this, this unlatching trigger controller makes a power switch, approximately operates in one first switching frequency.Cross the high pressure reference value when this feedback voltage exceeds this, this unlatching trigger controller makes this power switch, approximately operates in one second switching frequency.This second switching frequency is lower than this first switching frequency.
Description of drawings
Fig. 1 is a kind of switch type power supplying device of existing employing primary side control.
Fig. 2 shows power-supply controller of electric 26 and some outer members among Fig. 1.
Fig. 3 and Fig. 4 two power-supply controller of electric for implementing according to the present invention.
The reference numeral explanation
12 samplers
14 pulse generators
15 transducers
16 pulse width controllers
20 bridge rectifiers
24 loads
26,26
a, 26
bPower-supply controller of electric
28,30 divider resistances
32 building-out capacitors
34 power switchs
60 comparators
62 oscillators
64 pulse width controllers
66 shut-in time controllers
The AC mains terminal
AUX assists winding
COMP compensates end
FB feedback end
The GATE drive end
The IFB intermediate ends
The IN input
The OUT output
PRM primary side winding
SEC primary side winding
SET sets end
S
OVComparative result
V
FBFeedback voltage
V
IFBFeedback voltage
V
INVoltage
V
OS-REFCross the high pressure reference value
V
REFTarget voltage
Embodiment
In the example of this specification, have the element of same-sign, expression has the element of identical or identity function, structure, operation.Those of ordinary skill in the art can according to announcement and the instruction of this specification, simply know distortion or the variation of the embodiment in this specification by inference, and not depart from spirit of the present invention.
Power-supply controller of electric 26 among Fig. 2 when weight carries switching, may have output voltage V
OUTShake excessive problem.
For instance, when load 24 changes into underloading or no-load by heavy duty suddenly, output voltage V
OUTCan rise suddenly.And power-supply controller of electric 26 must be after a period of time, at transducer 15 bucking voltage V
COMPull down to a certain degree, so that the electric energy that transformer is changed is when being lower than the electric energy that load 24 consumes, output voltage V
OUTJust may begin to descend.But, this moment output voltage V
OUTProbably surpassed the specification demands of power-supply management system.
The power-supply controller of electric 26 of Fig. 3 for implementing according to the present invention
aIn one embodiment, power-supply controller of electric 26
aReplace the power-supply controller of electric 26 among Fig. 1.
Power-supply controller of electric 26
aInclude sampler 12, pulse generator 14, transducer 15, comparator 60, oscillator 62 and pulse width controller 64.
After pulse width controller 64 is closed power switch 34, when primary side winding SEC and auxiliary winding AUX begin to discharge previous power switch 34 and open at the stored energy of primary side winding PRM.Primary side winding SEC and auxiliary winding AUX discharge the time of electric energy, are called (discharge time) T discharge time
DISAt T discharge time
DISIn, pulse generator 14 can provide a short pulse, makes sampler 12 for the feedback voltage V on the feedback end FB
FBTake a sample.Sampling result then leaves intermediate ends IFB in, becomes feedback voltage V
IFBTherefore, feedback voltage V
IFBBy feedback end FB, divider resistance 28 and 30, auxiliary winding AUX, and primary side winding SEC, by the effect of dividing potential drop and inductance coupling high, approximately represented output voltage V
OUT
By setting end SET, oscillator 62 provides setting signal S
SET, periodically trigger and open power switch 34.So the switching frequency of power switch 34 is substantially equal to setting signal S
SETFrequency.In one embodiment, setting signal S
SETFrequency, can be by bucking voltage V
COMDetermine.For instance, setting signal S
SETFrequency along with bucking voltage V
COMDescend and reduce.
Power-supply controller of electric 26 among Fig. 3
a, in the time of can suppressing heavy duty and turn underloading, output voltage V
OUTShake.Below explain orally with the embodiment of Fig. 1, but power-supply controller of electric 26 wherein is by power-supply controller of electric 26
aReplace and target voltage V
REFWith mistake high pressure reference value V
OS-REFBe assumed to be respectively 2.5V and 2.6V.When in case load 24 changes into underloading or no-load by heavy duty suddenly, because the electric energy that transformer transmits is higher than the electric energy that instantly load 24 consumes, output voltage V
OUTCan rise suddenly the related feedback voltage V that makes
IFBBegin to rise.In case feedback voltage V
IFBSurpassed and crossed high pressure reference value V
OS-REF2.6V, setting signal S
SETFrequency at once just be reduced to a very low value, so the electric energy power that transformer transmits descends at once significantly.Compared to prior art, it must wait bucking voltage V
COMAfter pulling down to a certain degree, the electric energy of transmission just can significantly descend, power-supply controller of electric 26
aIn case find feedback voltage V
IFBSurpassed and crossed high pressure reference value V
OS-REF2.6V, just reduce at once setting signal S
SETFrequency, also reduced the electric energy power that transformer transmits, therefore can make fast output voltage V
OUTNo longer rise.
Along with setting signal S
SET Periodic power switch 34, the feedback voltage V of opening
IFBAlso periodically be updated, follow the trail of output voltage V instantly
OUTAs long as feedback voltage V
IFBHanged down high pressure reference value V
OS-REF2.6V, power-supply controller of electric 26a just revert to normal running, for example, setting signal S
SETFrequency merely by bucking voltage V
COMDetermine.So, under normal operation, power-supply controller of electric 26
aBe the same with power-supply controller of electric 26, all can make feedback voltage V
IFBConverge to target voltage V
REF2.5V.
The power-supply controller of electric 26 of Fig. 4 for implementing according to the present invention
bBelow with power-supply controller of electric 26
bReplace the power-supply controller of electric 26 among Fig. 1, as one embodiment of the invention.
Power-supply controller of electric 26 in Fig. 2
a, power-supply controller of electric 26
bClose time controller (OFF time controller) 66, be couple to feedback end FB.Shut-in time controller 66 can realize that trough switches (valley switching).For instance, at T discharge time
DISAfterwards, the auxiliary winding voltage V of auxiliary winding AUX
AUXCan begin concussion, and gradually restrain towards 0V.Switch so-called the lowest point, may be after power switch 34 is closed, auxiliary winding voltage V
AUXThe 1st the lowest point that occurs, the 2nd the lowest point, the 3rd the lowest point etc. one of them when occuring, open power switch 34.This operator scheme is commonly referred to as quasi-resonance (quasi-resonance, QR) pattern.
By feedback end FB, shut-in time controller 66 can be known auxiliary winding voltage V
AUXWhen fall to hand over and cross (drop across) 0V, this is called zero-crossing (zero crossing).Shut-in time controller 66 can design and detect auxiliary winding voltage V
AUXFell 0V, a scheduled time just makes pulse width controller 64 open power switch 34 by setting end SET, triggering afterwards.So, just can realize approximately that trough switches.In order to prevent zero-crossing never to be detected, so shut-in time controller 66 can be designed as, after a maximum shut-in time, if still do not detect any zero-crossing, make pulse width controller 64 open power switch 34 with regard to forced-triggered.
In the embodiment of Fig. 4, as feedback voltage V
IFBBe lower than high pressure reference value V
OS-REFThe time, comparative result S
OVFor in logic 0, at this moment, setting signal S
SETTrigger the time point of opening power switch 34, can be according to bucking voltage V
COMDetermine by the detected zero-crossing of feedback end FB with shut-in time controller 66.In simple terms, as feedback voltage V
IFBBe lower than high pressure reference value V
OS-REFThe time, power-supply controller of electric 26b operates roughly at the QR pattern, may be at auxiliary winding voltage V
AUXTrigger during any the lowest point of occurring power switch 34 is opened.
As feedback voltage V
IFBBe higher than high pressure reference value V
OS-REFThe time, comparative result S
OVFor in logic 1, shut-in time controller 66 1 fixed on after the maximum shut-in time, just can trigger pulse width controller 64 and open power switchs 34.At this moment, the switching frequency of power switch 34, scarcely when operating in the QR pattern, the switching frequency of power switch 34.
Power-supply controller of electric 26 with Fig. 3
aSimilar, work as output voltage V
OUTHigher so that feedback voltage V
IFBBe higher than high pressure reference value V
OS-REFThe time, the power-supply controller of electric 26 of Fig. 4
bMake the shut-in time of power switch 34 for the maximum shut-in time, so switching frequency reduces at once.The electric energy power that transformer transmits can fast-descending, therefore can make fast output voltage V
OUTNo longer rise.
Can expect that the power-supply controller of electric of Fig. 3 and Fig. 4 can make feedback voltage V rapidly
IFBNo longer rise, so can reduce output voltage V
OUTShake, and make output voltage V
OUTConvergence faster.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (11)
1. primary side control method includes:
One feedback voltage is provided, and this feedback voltage can represent a secondary-side voltage of a primary side winding by an inductance coupling high effect;
Control a power switch with one first switching frequency;
Relatively this feedback voltage and one is crossed the high pressure reference value; And
When this feedback voltage is crossed the high pressure reference value above this, control this power switch with one second switching frequency;
Wherein, this second switching frequency is lower than this first switching frequency.
2. primary side control method as claimed in claim 1 also includes:
One feedback end is provided, and this feedback end is coupled to an auxiliary winding;
When this feedback voltage is lower than this and crosses the high pressure reference value,, trigger and open this power switch during greatly on a voltage trough in an auxiliary winding voltage of this auxiliary winding; And
When this feedback voltage is crossed the high pressure reference value above this, after the maximum shut-in time after this power switch is closed, trigger and open this power switch.
3. primary side control method as claimed in claim 1 also includes:
Relatively this feedback voltage and a target voltage are to control a bucking voltage; And
According to this bucking voltage, control an opening time of this power switch.
4. primary side control method as claimed in claim 3 also includes:
According to this bucking voltage, determine this first switching frequency.
5. primary side control method as claimed in claim 1 also includes:
One feedback end is provided, and this feedback end is coupled to an auxiliary winding; And
When this primary side winding discharges, this feedback end is taken a sample, to produce this feedback voltage.
6. a power-supply controller of electric is applicable to primary side control, includes:
One comparator is crossed the high pressure reference value in order to compare a feedback voltage and one, and wherein, this feedback voltage can represent a secondary-side voltage of a primary side winding by an inductance coupling high effect;
One opens trigger controller, be coupled to this comparator, wherein when being lower than this, this feedback voltage crosses the high pressure reference value, this unlatching trigger controller makes a power switch, approximately operate in one first switching frequency, cross the high pressure reference value when this feedback voltage exceeds this, this unlatching trigger controller makes this power switch, approximately operates in one second switching frequency;
Wherein, this second switching frequency is lower than this first switching frequency.
7. power-supply controller of electric as claimed in claim 6 also includes:
One sampler is coupled between a feedback end and this comparator, in order to this feedback end is taken a sample, to produce this feedback voltage; And
One pulse generator when this primary side winding discharges, provides a pulse, so that this sampler is taken a sample to this feedback end.
8. power-supply controller of electric as claimed in claim 6 also includes:
One transducer, relatively this feedback voltage and a target voltage are to control a bucking voltage.
9. power-supply controller of electric as claimed in claim 8, wherein, this unlatching trigger controller is an oscillator, provides a cyclical signal to open this power switch to trigger, this bucking voltage can determine that one of this cyclical signal switches frequency.
10. power-supply controller of electric as claimed in claim 6, wherein:
This unlatching trigger controller is a shut-in time controller, is coupled to a feedback end;
This feedback end is coupled to an auxiliary winding;
Cross the high pressure reference value when this feedback voltage is lower than this, when this shut-in time controller is assisted winding voltage greatly on a voltage trough in one of this auxiliary winding, trigger and open this power switch; And
Cross the high pressure reference value when this feedback voltage exceeds this, this shut-in time controller triggered and opens this power switch after the maximum shut-in time after this power switch is closed.
11. a power-supply management system includes:
One transformer has a primary side winding, auxiliary winding and a primary side winding;
One power switch is coupled to this primary side winding, controls an inductive current of this primary side winding of flowing through; And
One power-supply controller of electric is controlled this power switch, includes:
One feedback end is coupled to this auxiliary winding;
One comparator is crossed the high pressure reference value in order to compare a feedback voltage and one, and wherein, this feedback voltage is by this feedback end and should assist winding, can represent a secondary-side voltage of this primary side winding; And
One opens trigger controller, be coupled to this comparator, wherein when being lower than this, this feedback voltage crosses the high pressure reference value, this unlatching trigger controller makes this power switch, approximately operate in one first switching frequency, cross the high pressure reference value when this feedback voltage exceeds this, this unlatching trigger controller makes this power switch, approximately operates in one second switching frequency;
Wherein, this second switching frequency is lower than this first switching frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103195402A CN103066868A (en) | 2011-10-20 | 2011-10-20 | Primary side control method and power controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103195402A CN103066868A (en) | 2011-10-20 | 2011-10-20 | Primary side control method and power controller |
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| CN103066868A true CN103066868A (en) | 2013-04-24 |
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| CN2011103195402A Pending CN103066868A (en) | 2011-10-20 | 2011-10-20 | Primary side control method and power controller |
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| CN104184324A (en) * | 2014-06-19 | 2014-12-03 | 立锜科技股份有限公司 | Voltage conversion controller, a voltage conversion circuit and voltage conversion control method |
| CN104869693A (en) * | 2014-02-26 | 2015-08-26 | 英飞凌科技奥地利有限公司 | Valley to valley switching in quasi-resonant mode for driver |
| CN105305825A (en) * | 2014-07-18 | 2016-02-03 | 绿达光电股份有限公司 | Power controller and related control method |
| CN104467431B (en) * | 2013-09-18 | 2017-12-05 | 产晶积体电路股份有限公司 | Dynamic voltage scaling power control |
| CN112701920A (en) * | 2020-12-21 | 2021-04-23 | 成都芯源系统有限公司 | Control circuit of multi-output circuit and feedback circuit thereof |
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Application publication date: 20130424 |