CN105262340B - Power-supply controller of electric and relevant control method - Google Patents
Power-supply controller of electric and relevant control method Download PDFInfo
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Abstract
Power-supply controller of electric and corresponding control methods.Control method is suitable for power supply unit, and it includes inductance element and power switch.Power switch is controlled by pulse width modulating signal.Pulse width modulating signal has the multiple switch period.The cycle time of each switch periods has opening time and shut-in time.The cross-pressure of inductance element can vibrate and have cycle of oscillation, and generate an at least signal trough.Control method includes: providing duration of oscillation record, duration of oscillation before representing is associated with the preceding switch period；In in switch periods, turning off the time according to preceding duration of oscillation control power switch terminates；And duration of oscillation record is updated according to duration of oscillation.Duration of oscillation and preceding duration of oscillation vibrated all since cross-pressure after starting point, and duration of oscillation terminates simultaneously with the shut-in time.The difference of duration of oscillation and preceding duration of oscillation is less than cycle of oscillation, so that one of preceding switch period and switch periods operate in trough switching, it is another to operate in non-trough switching.
Description
Technical field
The present invention relates to power supply controls, more particularly to switch type power supplying device (switched mode power
supply)。
Background technique
Switch type power supplying device uses a power switch generally to control the electric current for flowing through an inductance element.With other
In comparison, switch type power supplying device has lesser small product size and advantageous conversion effect to general power supply unit
Rate, so by the welcome and use of industry.
In numerous switch type power supplying devices, there is one kind to operate in quasi-resonance (quasi-resonance, QR) mode,
Referred to as QR switch type power supplying device.QR switch type power supplying device can make a power switch, in its cross-pressure substantially minimum
When, from a closed state, and become on state, so can theoretically reduce the switching loss (switching of the power switch
loss).Therefore, usually quite outstanding when the transfer efficiency, especially high load of QR switch type power supplying device.
Fig. 1 show one well known to QR switch type power supplying device 10, wherein transformer be an inductance element, have phase inductance
Armature winding PRM, the secondary windings SEC and an auxiliary winding AUX of coupling.QR switch type power supplying device 10 is by input voltage
VINIt is powered, provides load 24 1 output voltage VOUTAnd one output electric current IOUT.QR controller 26 generates pulse width modulation
(PWM) signal VGATE, by driving end GATE, carry out periodic switch power switch 34.Pass through divider resistance 28 and 30, QR control
Device 26 processed detects the cross-pressure V of auxiliary winding AUXAUX.Fig. 2 shows the pwm signal V in Fig. 1GATEAnd cross-pressure VAUX.In Fig. 2,
Pwm signal VGATETwo rising edges between be a switch periods, the time therebetween is known as cycle time TCYC, by one
Opening time TONWith a shut-in time TOFFIt is constituted.Opening time TONIt is power switch 34 in a cycle time TCYCInterior
The lasting time span for maintaining to open and pwm signal VGATEIn pulse width.As shown in Figure 2, when closed between TOFF
It is latter half of, because of inductance element discharge off, cross-pressure VAUXStart to vibrate and there are two signal trough VL1With VL2.QR controller
26 can make cycle time TCYCAbout end at signal trough VL2When appearance.Make cycle time when signal trough occurs in this way
TCYCThe control mode of end, commonly referred to as trough switch (valley switching).
In QR switch type power supplying device 10, it is located at compensating end COMP, there is a thermal compensation signal VCOMP, it is controlled by operation and puts
Big device 20, and operational amplifier 20 compares output voltage VOUTWith target voltage VTARBetween difference.Well known QR controller 26
In, thermal compensation signal VCOMPOpening time T is substantially determined simultaneouslyONAnd masking time TBLOCK.In masking time TBLOCKTerminate it
Afterwards, QR controller 26 just allows end period time TCYC, to avoid the switching of premature trough, lead to switching frequency fCYC(=1/
TCYC) excessively high and reduce transfer efficiency.So masking time TBLOCKEqual to defining maximum switching frequency fCYC-MAX(=1/
TBLOCK)。
There are two possible problems for well known QR switch type power supplying device 10.
1. Electromagnetic Interference is difficult to solve.In a fixed load 24, thermal compensation signal VCOMPIt may be fixed one
Value, power switch 34 terminate a cycle time T in a fixed signal troughCYC, this just means fixed switch frequency
Rate fCYCAnd considerably more intense Electromagnetic Interference.Settling mode well known to a kind of is for thermal compensation signal VCOMPIt carries out small dry
It disturbs, but negative feedback mechanism provided by operational amplifier 20 is often automatically provided interference counteracting, therefore effect is not
Obviously.
2. the appearance of noise (audible noise).In a fixed load 24, thermal compensation signal VCOMPIt may vibration
It swings, so that QR controller 26 carries out trough switching in a signal trough a little while, and separately a little while adjacent at another
Signal trough carries out trough switching.Trough switches unstable as a result, QR switch type power supplying device 10 may be made to produce in this way
The raw noise for disturbing people.The power supply unit of noise can be generated, is usually difficult to allow market to receive.
Summary of the invention
The present invention discloses a kind of power-supply controller of electric, is suitable for a switch type power supplying device.The switch type power supplying device
It include the inductance element and a power switch being cascaded.One cross-pressure of the inductance element can be vibrated and be generated at least
One signal trough.The power switch is controlled by a pulse width modulating signal.The pulse width modulating signal has one to open
Time and a shut-in time.The power-supply controller of electric includes a valley detection device, a masking time generator and a closing
Time controller.The valley detection device is coupled to the inductance element, to generate a trough indication signal, with point out this at least one
The time that signal trough occurs.The masking time generator provides the masking time.Shut-in time controller record has a vibration
Time record is swung, duration of oscillation before representing one is associated with a preceding switch period；When according to duration of oscillation record, the masking
Between and the trough indication signal, to terminate the shut-in time；And according to a duration of oscillation, update duration of oscillation record.
A starting point after the duration of oscillation is vibrated by the cross-pressure starts, and terminates together with the shut-in time.
The present invention discloses a kind of control method, is suitable for a power supply unit, it includes have an inductance element and a function
Rate switch.The power switch is controlled by a pulse width modulating signal.The pulse width modulating signal has multiple switch week
Phase.The cycle time of each switch periods has an opening time and a shut-in time.One cross-pressure of the inductance element can shake
It swings and there is a cycle of oscillation, and generate an at least signal trough.The control method includes: duration of oscillation record is provided,
Duration of oscillation before it represents one is associated with a preceding switch period；In in a switch periods, according to the preceding duration of oscillation, control should
Power switch terminates the shut-in time；And according to a duration of oscillation, update duration of oscillation record.The duration of oscillation with
The preceding duration of oscillation vibrated all since the cross-pressure after a starting point, and the duration of oscillation is tied simultaneously with the shut-in time
Beam.The difference of the duration of oscillation and the preceding duration of oscillation is less than the cycle of oscillation so that the preceding switch period and the switch periods its
One of operate in trough switching, it is another to operate in the switching of non-trough.
Detailed description of the invention
Fig. 1 show one well known to QR switch type power supplying device.
Fig. 2 shows the pwm signal V in Fig. 1GATEAnd cross-pressure VAUX；
Fig. 3 shows the QR controller implemented according to the present invention；
Fig. 4 shows some signal waveforms in the QR switch type power supplying device that one is implemented according to the present invention；
One output electric current estimator of Fig. 5 citing；
Fig. 6 display load representation signal VL-ESTWith output electric current IOUTRelationship；
Fig. 7 display load representation signal VL-ESTWith a maximum switching frequency fCYC-MAX(=1/TBLOCK) between relationship；
Fig. 8 shows the power-supply controller of electric implemented according to the present invention；
Fig. 9 shows the QR controller that conversion can be implemented；
After Figure 10 shows QR controller 300 instead of the QR controller 26 of Fig. 1, some signal waveforms in circuit；
Figure 11 is control method used by shut-in time controller 302 in an embodiment；
Figure 12 shows when turning low-load by high load, the cross-pressure V in some continuous switch periodsAUXAnd some signals
Timing；
Figure 13 shows when turning high load by low-load, the cross-pressure V in some continuous switch periodsAUXAnd some signals
Timing；
In Figure 14 display well-known technique, duration of oscillation TS-VLA kind of possible variation；And
Figure 15 shows in an embodiment according to the present invention, duration of oscillation TS-VLA kind of possible variation.
Accompanying drawings symbol description
10 QR switch type power supplying devices
20 operational amplifiers
24 loads
26 QR controllers
28,30 divider resistance
34 power switch
36 resistance
80 QR controllers
82 valley detection devices
84 discharge time detectors
86 output electric current estimators
88 and door
90 masking time generators
92 frequency jitter devices
94 pulse-width modulators
100 CS peak voltage detectors
102 voltage controlled current source
104 switches
190 transducers
192 electric potential transducers
196 more novel circuits
198 collect capacitor
199 capacitors
200 power-supply controller of electric
300 QR controllers
302 shut-in time controllers
304、305、306、308、310、312、314、315、316、318、320、322、324
Step
ACC collecting terminal
AUX auxiliary winding
COMP compensating end
CS current detecting end
fCYCSwitching frequency
fCYC-MAXMaximum switching frequency
GATE drives end
ICHARGECharging current
ICSElectric current
IDISDischarge current
ILPredetermined current
IHPredetermined current
IOUTExport electric current
IPRMElectric current
PRM armature winding
PTS-VLPreceding duration of oscillation
The test side QRD
SBLOCKMask signal
SEC secondary windings
SJITTERDither control signal
SLOCKLocking signal
STDISDischarge time signal
SUPDATEMore new signal
SVDTrough indication signal
tSTR、t1、t2、t3、t4、tRELEASE、tEND、tAB-1ST、tW-S、tW-E
Time point
TBLOCKCover the time
TCYCCycle time
TAUX-CYCCycle of oscillation
TDISDischarge time
TOFFShut-in time
TONOpening time
TS-VLDuration of oscillation
Window when TW
VACCFeedback voltage
VAUXCross-pressure
VCOMPThermal compensation signal
VCOMP-SCALEDProportional compensation signal
VCSCurrent detection signal
VCS-PEAKVoltage
VGATEPWM signal
VINInput voltage
VL1、VL2、VL3Signal trough
VL-ESTLoad representation signal
VMVoltage
VOUTOutput voltage
VQRDDetect voltage
VREFPredetermined reference voltage
VTARTarget voltage
Specific embodiment
In the power-supply controller of electric that one embodiment of the invention is illustrated, a thermal compensation signal VCOMPWhen only determining a unlatching
Between TON.The power-supply controller of electric can remove a discharge time T of one auxiliary winding AUX of detectionDIS, then utilize current detection signal VCS
And discharge time TDIS, go to extrapolate a load representation signal VL-EST.Load representation signal VL-ESTIt can substantially represent and work as
Under power supply unit, to one load provided by export electric current IOUT.The power-supply controller of electric is according to load representation signal VL-EST
To determine a masking time TBLOCK.In masking time TBLOCKAfter past, which just allows the end period time
TCYC。
Briefly, in one embodiment of this invention, opening time TONIt is by thermal compensation signal VCOMPIt is determined, and is covered
Time TBLOCKIt is by representing output electric current IOUTLoad representation signal VL-ESTIt is determined.
Under such design, as long as under the constant limit of the load, output electric current IOUTIt is the normal of a fixation
Number, and corresponding masking time TBLOCKIt will be about a definite value.At this point, thermal compensation signal VCOMPIt can automatically be adjusted
It is whole, and generate appropriate opening time TON.As a result the power switch for being exactly the power supply unit can be in a fixed signal
Trough carries out trough switching, no longer has trough in well-known technique and switches unstable problem generation.It is possible that can eliminate
Noise.
In one embodiment of this invention, switch be may cause Electromagnetic Interference to eliminate fixed trough, because
This power-supply controller of electric is for masking time TBLOCKShaken (jittering).Masking time TBLOCKShake knot
Fruit influences whether thermal compensation signal V certainlyCOMP.But in this embodiment, thermal compensation signal VCOMPThe masking time is not interfered with
TBLOCK, because of masking time TBLOCKSubstantially only by output electric current IOUTAnd the shake is influenced, and measure electromagnetic wave
When interference, output electric current IOUTFor definite value.Hence, it can be determined that masking time TBLOCKShake as a result, substantially can be loyal
Ground also effectively, by masking time TBLOCKChange in certain a small range, possibility can be by switching frequency fCYCChange in opposite
An a small range is answered, to solve the problems, such as Electromagnetic Interference.
Fig. 3 shows the QR controller 80 implemented according to the present invention, and in one embodiment, that replace the QR in Fig. 1
Controller 26.As shown in Figure 3, QR controller 80 include valley detection device 82, discharge time detector 84, output electric current estimate
Calculate device 86 and door 88, masking time generator 90, frequency jitter device 92 and pulse-width modulator 94.Fig. 4 shows QR control
Some signal waveforms after device 80 processed is instead of the QR controller 26 of Fig. 1, in circuit.The following description, referring to Fig. 1,3
With 4.
Discharge time detector 84 is coupled to auxiliary winding AUX by test side QRD and divider resistance 30 and 28.It puts
Cross-pressure V of the electric time detector 84 according to auxiliary winding AUXAUX, to generate discharge time signal STDIS, can indicate that auxiliary
Help a discharge time T of winding AUXDIS.For example, such as the discharge time signal S in Fig. 4TDISWaveform shown in, electric discharge
Time TDISAbout in opening time TONAfter, cross-pressure VAUXThe 1st rising edge (in time point t1) to the 1st falling edge
Between (in time point t2) time.
Valley detection device 82 is by test side QRD, to detect in discharge time TDISAfterwards, cross-pressure VAUXOn the signal that occurs
Trough.There is detection voltage V on the QRD of test sideQRD.Valley detection device 82 can generate a trough indication signal SVD, with multiple arteries and veins
Punching, each time for indicating a pair of of induction signal trough and occurring.For example, as cross-pressure VAUXThe 0V latter set time is descend below,
Trough indication signal SVDJust there is a pulse.Such as the cross-pressure V in Fig. 4AUXWith trough indication signal SVDWaveform illustrated,
Cross-pressure VAUXT between when closedOFFInterior first time descends below 0V (time point t3) after, indicate signal trough VL1Occur, so leading
It causes in time point t4, trough indication signal SVDWith a pulse.Similar, signal trough VL2There is latter set time, wave
Paddy indication signal SVDWith another pulse.
As shown in figure 3, output electric current estimator 86 receives current detection signal VCSAnd discharge time signal STDIS, accordingly
Generate load representation signal VL-EST.Current detection signal VCSPositioned at current detecting end CS, the electric current for flowing through resistance 36 is indicated
ICS, it is also the electric current I for flowing through armature winding PRMPRM.Although loading representation signal VL-ESTBe estimate as a result, still it
The output electric current I for being supplied to load 24 can substantially be representedOUT.It will be exemplified in detail output electric current estimator 86 later.
Time generator 90 is covered, according to load representation signal VL-EST, generate a mask signal SBLOCK, to provide masking
Time TBLOCK.For example, as load representation signal VL-ESTWhen bigger, time T is coveredBLOCKIt is bigger.As the masking of Fig. 4 is believed
Number SBLOCKWaveform illustrated, cover time TBLOCKWith cycle time TCYCIt substantially synchronizes and starts (in time point tSTR), and cover
Time TBLOCKEnd at time point tRELEASE。
Frequency jitter device 92 is connected to masking time generator 90, provides a dither control signal SJITTER, to a little
Change cover time TBLOCK.For example, in the case where loading a 24 constant stable states, dither control signal SJITTERFor a period
Property signal, change frequency 400Hz, and dither control signal SJITTERIt can make to cover time TBLOCKChange in 1/ (27.5kHz)
Between~1/ (25kHz), so switching frequency fCYCIt will likely about can change between 25kHz~27.5kHz.In other words, this
When, dither control signal SJITTERPeriod of change (=1/400), be much larger than cycle time TCYC(between 1/ (27.5kHz) and 1/
(25kHz))。
Two inputs with door 88 are respectively connected to masking time generator 90 and valley detection device 82.Only covering
Time TBLOCKAfter, trough indication signal S can be just transmitted with door 88VD, and trough indication signal SVDIn pulse could be arranged
(set) pulse-width modulator 94.Such as the trough indication signal S of Fig. 4VDWith mask signal SBLOCKWaveform illustrated,
Cover time TBLOCKTerminate (tRELEASE) after time point tEND, trough indication signal SVDThere is a pulse, and this pulse
Provided with pulse-width modulator 94, so that pwm signal VGATEIt is arranged to " 1 " in logic.Make cycle time T with door 88CYC
End to cover time TBLOCK(time point t when first signal trough afterwards occursEND).The time point t of this switch periodsEND,
Equal to the time point t of next switch periodsSTR。
Such as the time point t in Fig. 4STRWith tENDIt is illustrated, as pwm signal VGATEOne is arranged to " 1 " in logic
When, power switch 34 is turned on, and starts a cycle time TCYCAn and opening time TON.Pulse-width modulator 94 is according to benefit
Repay signal VCOMPWith current detection signal VCS, determine opening time TONLength.For example, one ratio of display mends in Fig. 4
Repay signal VCOMP-SCALED, substantially ratio is in thermal compensation signal VCOMP.Such as the waveform institute of the current detection signal VCS in Fig. 4
Show, as current detection signal VCSMore than proportional compensation signal VCOMP-SCALEDWhen (time point t1), pwm signal VGATEIt is changed to patrol
" 0 " on volume, opening time TONTerminate, shut-in time TOFFStart.
Fig. 5 citing output electric current estimator 86, with transducer 190, electric potential transducer (level shifter) 192,
One more novel circuit 196, one collects capacitor 198, a switch 104, a voltage controlled current source (voltage-controlled
Current source) 102 and a CS peak voltage detector 100.
CS peak voltage detector 100 generates voltage VCS-PEAK, which represent current detection signal VCSA peak value.Citing
For, Figure 10 in the U.S. Patent application of Publication No. US20100321956A1 provides for CS peak voltage detector 100
An example.In some embodiments, CS peak voltage detector 100 can use the beauty of Publication No. US20100321956A1
Replaced the average current detection device illustrated in Figure 17 or Figure 18 of state's patent application.Voltage controlled current source 102 is by voltage
VCS-PEAKIt is converted into discharge current IDIS, only in discharge time signal STDISWhen for " 1 " in logic, collecting terminal ACC is put
Electricity.In other words, discharge current IDISTo the discharge time of collecting terminal ACC, equivalent upper approximately equal to discharge time TDIS.In some realities
It applies in example, the switch 104 in Fig. 5 can be omitted, instead, discharge time signal STDISFor start (activate) or
It is to close (deactivate) voltage controlled current source 102.Voltage V on capacitor 199M, after being displaced by conversion, become load
Representation signal VL-EST, transducer 190 is given, is used to a predetermined reference voltage VREFCompare.Transducer 190 according to comparison result,
To export charging current ICHARGE, constantly charge to collecting terminal ACC.More novel circuit 196 is by more new signal SUPDATEIt is triggered, it is right
Feedback voltage V on collecting terminal ACCACCSampling, Lai Gengxin voltage VM, can be with each cycle time TCYCIt is primary to update.More
New signal SUPDATENot necessarily each cycle time TCYCIt allows for more novel circuit 196 and executes update once, for example, can also
With every two cycle time TCYCIt executes and updates once.In one embodiment, more new signal SUPDATEPulse width can be equal to
Modulated signal VGATE, it is meant that T between the movement when closed of updateOFFIt is performed when at the beginning.Voltage VMUsually all it is held in
One definite value just will become another definite value after more novel circuit 196 updates it.From described above it can be found that when electricity
Press VMWhen constant, charging current ICHARGEAlso it can remain unchanged.
In a cycle time TCYCIt is interior, it collects the record of capacitor 198 and has collected charging current ICHARGEIn cycle time TCYC's
One charging integral result and discharge current IDISIn discharge time TDISOne electric discharge two integral results of integral result difference.
It is analyzed in the U.S. Patent application of similar Publication No. US20100321956A1, as charging current ICHARGEFor
One definite value, and feedback voltage VACCValue when being sampled, value when being sampled equal to the last time, that charging current ICHARGEJust
It can be the output electric current I with being output to load 24OUTIt is proportional.In order to make charging current ICHARGEWith exporting electric current IOUTIt is proportional,
So feedback voltage VACCValue when being sampled every time, it is necessary to the same or stable.More novel circuit 196, electric potential transducer 192,
And transducer 190 together forms the primary Ioops with negative loop gain (negative loop gain), and this circuit
Feedback voltage V can finally be madeACCValue when being sampled every time is stablized and is worth at one.For example, if charging current
ICHARGEGreater than with exporting electric current IOUTA proportional desired value, that feedback voltage VACCIn the sampling of next time, will become larger,
Cause updated voltage VMAlso with becoming larger, therefore, charging current ICHARGEIt will become smaller.Vice versa.So loading
When 24 constant stable state, voltage VMOne can be stopped to be relatively fixed value, and charging current ICHARGECan finally become about with
Export electric current IOUTIt is proportional.
Fig. 6 is shown in one embodiment, loads representation signal VL-ESTWith output electric current IOUTRelationship.As shown in Figure 6,
Load representation signal VL-ESTWith output electric current IOUTSubstantially one-to-one relationship, so load representation signal VL-ESTIt can be substantially
Represent output electric current IOUT。
Load representation signal VL-ESTSubstantially determine a masking time TBLOCK, so output electric current IOUTSubstantially determine masking
Time TBLOCK, that is, maximum switching frequency fCYC-MAX(=1/TBLOCK).Fig. 7 is shown in one embodiment, exports electric current IOUTWith
One maximum switching frequency fCYC-MAX(=1/TBLOCK) between relationship.As output electric current IOUTIt is bigger than normal, for example, to be greater than default
Electric current IH, indicate that load 24 is a high load, maximum switching frequency fCYC-MAXWith dither control signal SJITTERChange frequency, adjust
Frequency processed changes between 60kHz~66kHz.As output electric current IOUTWhen less than normal, for example, be less than predetermined current IL, indicate
Load 24 is a low-load, maximum switching frequency fCYC-MAXWith dither control signal SJITTERChange frequency, modulating frequency in
Change between 25kHz~27.5kHz.
From Fig. 3 and Fig. 4 it can be found that opening time TONIt is by thermal compensation signal VCOMPIt is determined, and covers time TBLOCKIt is
Electric current I is exported by representingOUTLoad representation signal VL-ESTIt is determined.
As described above, under such design, as long as exporting electric current in the case where loading a 24 constant limits
IOUTIt is a fixed constant, and corresponding masking time TBLOCKA just about definite value, will not be with thermal compensation signal VCOMP's
Change and is changed.It as a result is exactly that the power switch 34 of the power supply unit can carry out trough in a fixed signal trough
Switching no longer has trough in well-known technique and switches unstable problem generation.It is possible that noise can be eliminated.
Moreover, covering time T as Fig. 3 and Fig. 7 are illustratedBLOCKSubstantially only by output electric current IOUTAnd shake control
Signal S processedJITTERWhen being influenced, and measuring Electromagnetic Interference, output electric current IOUTFor definite value.Hence, it can be determined that shake control
Signal S processedJITTERSubstantially verily also effectively it will can cover time TBLOCKChange in certain a small range, that is, switchs
Frequency fCYCIt will change in a corresponding a small range.In this way, the problem of Electromagnetic Interference may be can solve.
What is illustrated above is QR switch type power supplying device, but the present invention is not limited thereto.Fig. 8 is shown according to this hair
Bright an implemented power-supply controller of electric 200.Power-supply controller of electric 200 does not operate in QR mode, but in one embodiment, Ke Yiqu
For the QR controller 26 in Fig. 1.Power-supply controller of electric 200 shown in Fig. 8 without in Fig. 3 valley detection device 82 with door 88, and
Mask signal SBLOCKThe setting end of pulse-width modulator 94 is directly connected to after reversed.As masking time TBLOCKAt the end of, arteries and veins
It rushes width modulator 94 to be just set at once, and gets started the cycle time T in next switch periodsCYCAnd when opening
Between TON.In other words, under the control of power-supply controller of electric 200, cycle time TCYCApproximately equal to cover time TBLOCK。
In another embodiment of the present invention, the power supply unit most of the time is operate within trough switching, only,
During the trough switching for being transformed into another signal trough from the trough switching of a signal trough, some switch periods are simultaneously
Not operation switches in trough.For example, which is operate within the trough switching of the 3rd signal trough at the beginning,
Then probably due to load becomes larger or other possible reasons, the switching time of switch periods later it is gradual toward previous
A signal trough (namely the 2nd signal trough) is close, after several switch periods, can just operate in the 2nd signal wave
The trough of paddy switches.Soft conversion (the soft transition for of such conversion process, referred to herein as trough switching
Valley switching), indicate that two operate between the switch periods of the trough switching of unlike signal trough, it can
To admit of the switch periods of at least one or multiple non-trough switchings.
Fig. 9, which is shown, can be implemented the QR controller 300 walked around and changed, and can replace the QR controller 26 in Fig. 1, as this
One embodiment of invention.QR controller 300 in Fig. 9 and the ground similar to each other or the same of the QR controller 80 in Fig. 3 can
To be learnt by prior teachings, it is not repeated herein.QR controller 300 is controlled with shut-in time controller 302 instead of QR
In device 80 with door 88.Shut-in time controller 302 can make a power supply unit in masking time TBLOCKAfter first
When a signal trough occurs, to terminate a shut-in time TOFF, carry out trough switching.But in some conditions, the shut-in time
Controller 302 can also switch without trough, will be explained in later.
After Figure 10 shows QR controller 300 instead of the QR controller 26 of Fig. 1, some signal waveforms in circuit.Figure 10
Part identical with Fig. 4 can be bright and learn with reference to Fig. 4, it is not repeated.
Duration of oscillation TS-VLIt is the discharge time T in a switch periodsDISAfter a regular time point to close
Time TOFFTerminate (tEND) between time span.In example in Figure 10, duration of oscillation TS-VLIt is from time point t2To tEND。
In another embodiment, it can be from time point t3To tEND, or from time point t4To tEND.In preferred example, vibration
Swing time TS-VLAt the beginning of must not put and be later than time point t4, that is, trough indication signal SVDIn discharge time TDISTerminate
The time that first pulse occurs afterwards.Duration of oscillation TS-VLCross-pressure V can be generally considered asAUXVibrated how long, the period instantly
Time TCYCOr shut-in time TOFFJust terminate.
In some situations, preceding duration of oscillation PTS-VLIt is then the duration of oscillation T in previous switch periodsS-VL.Citing comes
It says, the duration of oscillation T in switch periods instantlyS-VL, it is exactly the preceding duration of oscillation PT in next switch periodsS-VL.Other
Some situations in, preceding duration of oscillation PTS-VLIt is the duration of oscillation T before the multiple switch periodS-VL。
When window TW be between time point tW-SWith tW-EBetween time, be according to preceding duration of oscillation PTS-VLIt is produced.Citing
For, time point tW-SIt is to be located at preceding duration of oscillation PTS-VLThe previous predetermined time terminated, and time point tW-EWhen positioned at preceding oscillation
Between PTS-VLAfter another predetermined time.The two predetermined times can be the same or different.When window TW length it is preferably small
In cross-pressure VAUXA cycle of oscillation TAUX-CYC.One cycle of oscillation TAUX-CYCBetween about two signal wave valley portions when
Between, also approximately equal to cross-pressure VAUXContinuous two falling edges are lower than the time between 0V.
Time point tAB-1STFor time point tRELEASE(masking time TBLOCKTerminate) after, trough indication signal SVDIt is produced
The first pulse occur time point.It in other words, is also about exactly to cover time TBLOCKAfter, first signal trough occurs
Time point.Time point tAB-1STWith time point tENDOccur while not necessarily as shown in Figure 10.Namely next switch
Period not necessarily starts from time point tAB-1ST。
Figure 11 is control method used by shut-in time controller 302 in an embodiment.Shut-in time controller 302
There is a register, note down and the locking signal S of number is providedLOCK.As locking signal SLOCK(to differentiate in step when " 1 " in logic
It is rapid 305), expression wants trough to lock, it is meant that trough switching will be locked in the same signal trough；Conversely, locking signal SLOCK
For " 0 " in logic, indicate that trough does not lock, it is meant that the signal trough that trough switching occurs can change.
Record has a duration of oscillation to note down RT in shut-in time controller 302, duration of oscillation PT before can representingS-VL。
Step 306 is according to preceding duration of oscillation PTS-VL, window TW when providing, that is, determine time point tW-SWith tW-E.In other words, step 306
RT is noted down according to duration of oscillation, determines time point tW-SWith tW-E。
In the locking of not trough, step 308 makes time point tENDWhen can only occur in window TW, that is, cannot be earlier than
Time point tW-S, it is not possible to it is later than time point tW-E.As for exact time point tENDThen regard time point tAB-1STRelative position and
It is fixed.If time point tAB-1STBefore form TW, that is, time point tAB-1STEarlier than time point tW-SOccur, then time point tEND
It is exactly time point tW-S.If time point tAB-1STIt comes across within form TW, then time point tENDIt is exactly time point tAB-1ST.If
Time point tW-EEarlier than time point tAB-1ST, then cycle time TCYCWith shut-in time TOFFTerminate at once, time point tENDEqual to the time
Point tW-E.In time point tEND, pwm signal VGATEA rising edge is had, end period time T is carried outCYCWith shut-in time TOFF.Vibration
Swing the time record RT, when closed between TOFFAt the end of, it can be updated, by the duration of oscillation T of this switch periodsS-VLInformation, band
It is gone to next switch periods, becomes the preceding duration of oscillation PT in next periodS-VL.In this embodiment, shut-in time TOFFTerminate
Time point, depend on form TW and time point tAB-1ST, and form TW is determined by duration of oscillation record RT, time point tAB-1STBy
Cover time TBLOCKWith trough indication signal SVDIt is determined.
In trough locking, step 316 makes time point tENDIt is exactly preceding duration of oscillation PTS-VLAt the end of.So opening instantly
Close end cycle shut-in time TOFFWhen where signal trough, shut-in time T can be terminated with previous switch periodsOFFWhen where
Signal trough, it is the same, achieve the purpose that trough locks.
Shut-in time controller 302 also has a counter, provides a count value, is generally used to calculate time of trough locking
Number, as shown in step 320.Counter can also be considered as a kind of timer, for calculating the total time of trough locking.Step
322 displays, when the number of trough locking reaches a preset value N, locking signal SLOCK" 1 " of meeting logically, becomes logic
On " 0 ", release trough locking.In other words, locking signal SLOCKAt least can persistently there be N number of cycle time for " 1 ".Trough locking
After releasing, as time point tAB-1STNot when window TW in when, expression has not been trough switching, so step 315 makes to count
It is worth zero.As time point tAB-1STWhen entering again in window TW, expression should enter trough and lock, so step 314 makes to lock
Signal SLOCKFor " 1 " in logic, count value is set to increase by 1, counter starts counting.
Please refer to Fig. 1, Fig. 9, Figure 11 and Figure 12.Figure 12 is shown when turning low-load by high load, some continuously to open
Close the cross-pressure V in the periodAUXAnd the timing of some signals.
Such as the cross-pressure V in Figure 12 in X switch periodsAUXIt is shown, it is assumed that be steady in one before X switch periods
Determine state, shut-in time controller 302 it is stable when making trough switching betide the 2nd signal trough to occur.In X switch periods
In, time point tAB-1STNamely time point tEND(cycle time TCYCEnd), duration of oscillation TS-VLIt will be with preceding duration of oscillation
PTS-VLIt is identical, locking signal SLOCKFor " 0 ", count value N.Shut-in time T in Figure 11, in X switch periodsOFFBe according to
Follow step 304,305,306,308,310,312 and 324, such steps flow chart determines.
When+1 switch periods of X in Figure 12 start, probably due to turning low-load by high load, so time point tRELEASE
It is delayed suddenly, at the end of leading to then window TW, time point tAB-1STDo not occur still.When closing in+1 switch periods of X
Between TOFFStep 304,305,306,308,310,315 and 324 can be followed, such steps flow chart determines.So such as figure
Shown in 12, the time point t of+1 switch periods of XENDIt can be with time point tW-EAt about, locking signal SLOCKFor " 0 ", count value
It is 0.Duration of oscillation TS-VL, it will than preceding duration of oscillation PTS-VL, a predetermined time has been had more, as shown in Figure 12.This is predetermined
Time is cross-pressure VAUXCycle of oscillation TAUX-CYCA part, in Figure 12, this predetermined time be less than cross-pressure VAUXVibration
Swing cycle TAUX-CYCHalf.So as Figure 12 is evident from+1 switch periods of X are not trough switching.
In+2 switch periods of X in Figure 12, then at the end of window TW, time point tAB-1STDo not occur still.Therefore,
Shut-in time T in+2 switch periods of XOFFStep 304,305,306,308,310,315 and 324 can be followed.X+2 switchs
The time point t in periodENDIt can be with time point tW-EAt about, locking signal SLOCKFor " 0 ", count value 0.The switch week of X+2
Phase nor trough switching.
In+3 switch periods of X in Figure 12, time point tAB-1STWhen window TW in occur.Therefore ,+3 switch periods of X
In shut-in time TOFFStep 304,305,306,308,310,312 and 314 can be followed.As shown in Figure 12, X+3 is switched
The time point t in periodENDIt can be with time point tAB-1STAt about, locking signal SLOCKBecome " 1 ", count value 1.X+3 is opened
The period is closed as trough switching.
In+4 switch periods of X in Figure 12, because of locking signal SLOCKFor " 1 ", so time point tENDAppear in preceding vibration
Swing time PTS-VLAt the end of.Shut-in time T in+4 switch periods of XOFFStep 304,305,316,318 and 320 can be followed.
Preceding duration of oscillation PTS-VLIt will not be updated, and duration of oscillation TS-VLIt can front duration of oscillation PTS-VLEqually.Locking signal SLOCKStill
For " 1 ", count value becomes 2.+ 4 switch periods of X are trough switching.
From X switch periods to X during+4 switch periods, it is found that duration of oscillation TS-VLIt is with switch
Period and increase.Duration of oscillation TS-VLEnd time point, be the time point occurred from the 2nd signal trough, increase gradually, most
It is parked in the time point of the 3rd signal trough appearance afterwards, as shown in Figure 12.302 forced oscillation time of shut-in time controller TS-VL
With preceding duration of oscillation PTS-VLBetween difference, be less than cross-pressure VAUXCycle of oscillation TAUX-CYC。
After+4 switch periods of X in Figure 12, preceding duration of oscillation PTS-VLWith duration of oscillation TS-VLIt remains unchanged always,
It is approximately equivalent, each shut-in time TOFFStep 304,305,316,318 and 320 in the 11st figure can be followed and determined.Such as figure
Shown in 12, count value can increase by 1 with each switch periods, after count value becomes N, locking signal SLOCKCan just it become
More " 0 ", to release trough locking.
Please refer to Fig. 1, Fig. 9, Figure 11 and Figure 13.Figure 13 is shown when turning high load by low-load, some continuously to open
Close the cross-pressure V in the periodAUXAnd the timing of some signals.
Such as the cross-pressure V in Figure 13 in Y switch periodsAUXIt is shown, it is assumed that be steady in one before Y switch periods
Determine state, shut-in time controller 302 it is stable so that trough switching is betided the 3rd signal trough VL3When appearance.It is switched in Y
In period, time point tAB-1STNamely time point tEND(cycle time TCYCEnd), duration of oscillation TS-VLWhen will be with preceding oscillation
Between PTS-VLIt is identical, locking signal SLOCKFor " 0 ", count value N.Shut-in time T in Figure 11, in Y switch periodsOFFIt is
Follow step 304,305,306,308,310,312 and 324, such steps flow chart determines.
In Y+1 switch periods in Figure 13, probably due to low-load turns high load, so time point tRELEASEQuilt suddenly
Signal trough VL is arrived ahead of time1Near, lead to time point tAB-1STWhen appearance, when window TW do not occur not yet.Y+1 switch week
Interim shut-in time TOFFStep 304,305,306,308,310,315 and 324 can be followed, such steps flow chart determines.
So the time point t of Y+1 switch periodsENDIt can be with time point tW-SAt about, locking signal SLOCKFor " 0 ", count value is
0.Duration of oscillation TS-VL, it will than preceding duration of oscillation PTS-VL, lacked a predetermined time, as shown in Figure 12.This predetermined time
Only cross-pressure VAUXCycle of oscillation TAUX-CYCA part, in Figure 13, this predetermined time be less than cross-pressure VAUXOscillation week
Phase TAUX-CYCHalf.Figure 13 significantly shows that Y+1 switch periods are not trough switching.
In Y+2 switch periods in Figure 13, to time point tAB-1STWhen generation, when window TW terminate not occur still.Cause
This, the shut-in time T in Y+2 switch periodsOFFStep 304,305,306,308,310,315 and 324 can be followed.Y+2 is opened
Close the time point t in periodENDIt can be with time point tW-SAt about, locking signal SLOCKFor " 0 ", count value 0.Y+2 switch
Period nor trough switching.
In Y+3 switch periods in Figure 13, time point tAB-1STWhen window TW in occur.Therefore, Y+3 switch periods
In shut-in time TOFFStep 304,305,306,308,310,312 and 314 can be followed.The time point of Y+3 switch periods
tENDIt can be with time point tAB-1STAt about, locking signal SLOCKBecome " 1 ", count value 1.Y+3 switch periods are trough
Switching.
In Y+4 switch periods in Figure 13, because of locking signal SLOCKFor " 1 ", so time point tENDAppear in preceding vibration
Swing time PTS-VLAt the end of.Shut-in time T in Y+4 switch periodsOFFStep 304,305,316,318 and 320 can be followed
And it determines.Preceding duration of oscillation PTS-VLIt will not be updated, and duration of oscillation TS-VLIt can front duration of oscillation PTS-VLEqually.Locking letter
Number SLOCKIt is still " 1 " that count value becomes 2.
During Y switch periods to Y+4 switch periods, it is found that duration of oscillation TS-VLIt is with switch
Period and reduce.Duration of oscillation TS-VLEnd time point, be the time point occurred from the 3rd signal trough, reduction gradually, most
It is parked in the time point of the 2nd signal trough appearance afterwards.
After Y+4 switch periods in Figure 13, preceding duration of oscillation PTS-VLWith duration of oscillation TS-VLIt remains unchanged always, often
A shut-in time TOFFThe step 304 in Figure 11,305,316,318 and 320 can be followed and determined.As shown in Figure 13, count
Value can increase by 1 with each switch periods, after count value becomes scheduled N, locking signal SLOCKIt can just be changed to
" 0 " releases trough locking.
From Figure 11, Figure 12 and Figure 13 it is found that in one embodiment of this invention, once into the trough of a certain signal trough
After switching, trough locking will occur.The trough switching of namely this signal trough will continue at least N number of switch periods,
The trough switching that can permit another signal trough occurs.Moreover, also providing the soft conversion of trough switching in embodiment, also
It is to have at least one between the switch periods of two troughs switchings for being located at unlike signal trough and be not operate within trough switching
Switch periods.
In Figure 14 display well-known technique, duration of oscillation TS-VLA kind of possible variation.The prior art does not have so-called trough to cut
The soft conversion changed, therefore the duration of oscillation T of a switch periodsS-VL, duration of oscillation T with another switch periodsS-VL, centainly
It is cross-pressure VAUXCycle of oscillation TAUX-CYCIntegral multiple, as shown in Figure 14.Cycle of oscillation TAUX-CYCIt is about exactly two continuous
The time difference that signal wave valley portions occur.Duration of oscillation T big in this wayS-VLVariation, be easy to cause the unstable of whole system,
It will cause output voltage VOUTBiggish shake (ripple).
Moreover, the power supply unit of the prior art is also locked without so-called trough.Consequently, it can happen such as institute in Figure 14
The situation of display, with the advance of switch periods, trough switches in two signal troughs and rapidly jumps.
Figure 15 shows in an embodiment according to the present invention, duration of oscillation TS-VLA kind of possible variation.Figure 15 is shown
Soft conversion, so from the 4th signal trough VL4Trough switching, be transitted towards the 3rd signal trough VL3Trough switching during,
The switch periods of the non-trough switching of experience three.Figure 15 also shows the effect of trough locking, the 3rd signal trough VL3Trough
Switching has to experienced at least eight switch periods, and the trough switching that can just arrive another signal trough is advanced.From Figure 14 with
Figure 15 compares the duration of oscillation T it is found that in Figure 15S-VLChange more smooth, more unstable than less likely generation system result.
QR controller 300 in Fig. 9 has 1) masking time T simultaneouslyBLOCKBy load representation signal VL-ESTIt is determined；2) wave
The soft conversion of paddy switching；And 3) trough locks, these three technical characterstics, however, the present invention is not limited thereto.These three technical characterstics
It individually can independently implement or two two are combined with each other implementation.For example, 1) the embodiment of the present invention, which can be implemented, hides
Cover time TBLOCKBy load representation signal VL-ESTIt is determined；The soft conversion switched with 2) trough, the two technical characterstics, but do not have
Have and implements trough locking.Another embodiment then implements the soft conversion and trough locking of trough switching, but covers the time
TBLOCKBy thermal compensation signal VCOMPIt is determined, and unsupported representation signal VL-EST。
The above description is only a preferred embodiment of the present invention, it is all according to the claims in the present invention done it is same variation and repair
Decorations, should all belong to protection scope of the present invention.
Claims (11)
1. a kind of power-supply controller of electric is suitable for a switch type power supplying device, which includes to be connected on
An inductance element and a power switch together, a cross-pressure of the inductance element can vibrate and generate an at least signal trough,
The power switch is controlled by a pulse width modulating signal, which has an opening time and a pass
The time is closed, which includes:
One valley detection device, is coupled to the inductance element, to generate a trough indication signal, to point out an at least signal wave
The time that paddy occurs；
One masking time generator, provides the masking time；And
One shut-in time controller, includes duration of oscillation record, and duration of oscillation before representing one is associated with preceding switch week
Phase；According to duration of oscillation record, the masking time and the trough indication signal, to terminate the shut-in time；And foundation
One duration of oscillation updates duration of oscillation record；
Wherein, the starting point after which vibrates since the cross-pressure, and terminate together with the shut-in time.
2. power-supply controller of electric as described in claim 1, wherein the shut-in time controller can be recorded according to the duration of oscillation and be mentioned
For a period of time window, and the preceding duration of oscillation ends at when this within window.
3. power-supply controller of electric as claimed in claim 2, wherein the shut-in time controller limits the shut-in time and ends at this
When window in.
4. power-supply controller of electric as claimed in claim 2, in which:
The masking time starts together with the opening time；
First after the masking time comes across a first time point without mask signal trough；
When the first time point is earlier than this when window, which ends at a starting point of window when this；
When the first time point is later than this when window, which ends at an end point of window when this；And
When the first time point being located at this in window, which ends at the first time point.
5. power-supply controller of electric as claimed in claim 2, wherein this when window a length be less than the cross-pressure a cycle of oscillation.
6. power-supply controller of electric as described in claim 1, wherein the shut-in time controller forces the duration of oscillation and the preceding vibration
Swing the cycle of oscillation that the difference between the time is less than the cross-pressure.
7. power-supply controller of electric as claimed in claim 6, wherein the shut-in time controller has a timer, for recording
Trough switching locking betides the time of an identical signal trough.
8. a kind of control method is suitable for a power supply unit, it includes have an inductance element and a power switch, the power
Switch is controlled by a pulse width modulating signal, which has multiple switch period, each switch week
The cycle time of phase has an opening time and a shut-in time, and a cross-pressure of the inductance element can vibrate and have an oscillation
Period, and an at least signal trough is generated, which includes:
Duration of oscillation record is provided, duration of oscillation before representing one is associated with a preceding switch period；
In in a switch periods, according to the preceding duration of oscillation, the power switch is controlled, terminates the shut-in time；And
According to a duration of oscillation, duration of oscillation record is updated, wherein the duration of oscillation and the preceding duration of oscillation are all from the cross-pressure
A starting point after starting oscillation starts, and the duration of oscillation terminates simultaneously with the shut-in time；
Wherein, the difference of the duration of oscillation and the preceding duration of oscillation is less than the cycle of oscillation, so that the preceding switch period and the switch
One of period operates in trough switching, another to operate in non-trough switching.
9. control method as claimed in claim 8, also includes:
According to the preceding duration of oscillation, a period of time window is provided, wherein the preceding duration of oscillation ends at when this in window；And
When the shut-in time being made to end at this in window.
10. control method as claimed in claim 9, also includes:
One masking time was provided, is started together with the opening time；
After the masking time, it is indicated that one first comes across a first time point without mask signal trough；
When the first time point is earlier than this when window, which ends at a starting point of window when this；
When the first time point is later than this when window, which ends at an end point of window when this；And
When the first time point being located at this in window, which ends at the first time point.
11. control method as claimed in claim 8, also includes:
One locking signal is provided, continues the power supply unit at the end of the preceding duration of oscillation, terminates the shut-in time；And
After maintaining a locking signal at least duration, the locking signal is just released；
Wherein the duration is the scheduled multiple switch period.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1416613A (en) * | 2000-11-16 | 2003-05-07 | 皇家菲利浦电子有限公司 | Multiple valley controller for switching circuit |
| US7426120B2 (en) * | 2005-11-28 | 2008-09-16 | System General Corporation | Switching control circuit having a valley voltage detector to achieve soft switching for a resonant power converter |
| CN102545545A (en) * | 2011-01-03 | 2012-07-04 | 芯瑞科技股份有限公司 | Power supplies and control methods for operating in quadrature-resonance-similar mode |
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| KR101236501B1 (en) * | 2006-07-19 | 2013-02-22 | 페어차일드코리아반도체 주식회사 | Switching mode power supply and the driving method thereof |
| KR101274214B1 (en) * | 2006-11-30 | 2013-06-14 | 페어차일드코리아반도체 주식회사 | Switch mode power supply and the driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1416613A (en) * | 2000-11-16 | 2003-05-07 | 皇家菲利浦电子有限公司 | Multiple valley controller for switching circuit |
| US7426120B2 (en) * | 2005-11-28 | 2008-09-16 | System General Corporation | Switching control circuit having a valley voltage detector to achieve soft switching for a resonant power converter |
| CN102545545A (en) * | 2011-01-03 | 2012-07-04 | 芯瑞科技股份有限公司 | Power supplies and control methods for operating in quadrature-resonance-similar mode |
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Denomination of invention: Power supplies and control methods for operating in quadrature-resonance-similar mode Effective date of registration: 20200618 Granted publication date: 20190621 Pledgee: Bank of Nanjing Jiangbei District branch of Limited by Share Ltd. Pledgor: NANJING GREENCHIP SEMICONDUCTOR Co.,Ltd. Registration number: Y2020980003216 |
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