CN104734542A - Power source controller switched at trough bottom of voltage trough and related control method - Google Patents
Power source controller switched at trough bottom of voltage trough and related control method Download PDFInfo
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Abstract
The invention relates to a power source controller switched at the trough bottom of a voltage trough and a related control method. The power source controller and the related control method are suitable for a switching type power supply device. The switching type power supply device comprises a power switch. The power source controller comprises a feedback pin, a clamping circuit, a peak value detector, a trough detector and a delay circuit. The feedback pin is electrically coupled to an auxiliary winding of a transformer. The clamping circuit is electrically connected to the feedback pin, and is constructed to provide a clamping current so as to clamp a voltage of the feedback pin. The peak value detector is electrically connected to the clamping circuit to be used for generating a peak value record which corresponds to a peak value of the clamping current. The trough detector is electrically connected to the feedback pin, and is constructed to provide an entering signal which can point out a starting time point of the voltage trough. The delay circuit is constructed to be used for providing a trigger signal after the entering signal is delayed for a certain period of time. The delay time is changed along with changes of the peak value record, and the power switch can be turned on through the trigger signal.
Description
Technical field
Technology disclosed in the present specification is broadly directed to the power-supply controller of electric of switch type power supplying device and relevant control method, particularly relates to the power-supply controller of electric of operable switch formula power supply unit at quasi-resonant mode (quasi-resonant mode).
Background technology
Power supply changeover device plants the electric energy being used for battery or civil power to provide, and converts the electric energy with specific voltage or electric current to, correctly provide the electric energy that electronic equipment is suitable.Now, electronic equipment is particular about and is wanted environment friendly very much, and therefore, the conversion usefulness of power supply changeover device is a very important problem.Generally for the definition of conversion usefulness, refer to that the input electric energy of power supply changeover device is denominator, and be molecule to the output electric energy of load, the ratio obtained.If the electric energy that power supply changeover device self consumes is lower, conversion usefulness will be higher.The related industries of power supply supply, are all constantly devoted to pursue higher conversion usefulness.
No matter be in theory or actual result, the power supply changeover device operated under quasi-resonant mode has all been proved has quite good conversion efficiency.Fig. 1 shows the switch type power supplying device 10 be operable under quasi-resonant mode.
Bridge rectifier 20 provides full-wave rectification, by the AC power in commercial power socket, converts direct-current input power supplying V to
iN.Direct-current input power supplying V
iNvoltage may have the waveform of similar English alphabet M, or be roughly stabilized in a definite value.Power-supply controller of electric 26 can be an integrated circuit with many pins, and these pins can provide integrated circuit to be electrically connected to the element of periphery.By driving pin GATE, power-supply controller of electric 26 is switch power switch 34 periodically.When power switch 34 is opened, the main winding PRM of transformer starts energy storage; When power switch 34 is closed, transformer is released energy by primary side winding SEC and auxiliary winding AUX, sets up out-put supply V respectively
oUT(powering to load 24) and operating power V
cC(powering to power-supply controller of electric 26).
Resistance 28 and 30 constitutes a voltage divider, detects the cross-pressure V on auxiliary winding AUX
aUX, and on the feedback pin FB of power-supply controller of electric 26, provide feedback voltage signal V
fB.
Fig. 2 shows the waveform of some signals in Fig. 1.At time t
0, drive the drive singal V on pin GATE
gATEdrop fast, close power switch 34, start shut-in time T
oFF.Contact P between power switch 34 and main winding PRM there is signal V
p, its unexpected rising.Cross-pressure V
aUX, it roughly can map the cross-pressure of main winding PRM, at time t
0also suddenly become on the occasion of.Because feedback voltage signal V
fBroughly that ratio is in cross-pressure V
aUX, so feedback voltage signal V
fBat time t
0also suddenly become on the occasion of.Transformer is from time t
0, start to release energy.
When transformer is at time t
1after having released energy completely, be the oscillating circuit formed because of the parasitic capacitance on main winding PRM and contact P haply, cross-pressure V
aUXstart vibration.Cross-pressure V in Fig. 2
aUXwaveform have three troughs VL1, VL2 and VL3.Here trough refers to cross-pressure V
aUXwhen being approximately less than 0V.As shown in Figure 2, trough VL3 before also not terminating, shut-in time T
oFFjust finish.Generally, the power-supply controller of electric operating in quasi-resonant mode can trough when occurring, open power switch 34, and this technology switches (valley switching) also referred to as trough.If power switch 34 is at cross-pressure V
aUXjust be unlocked when being positioned at the bottommost of a trough, that signal V
pbe discharged from a region minimum value, so less switch cost (switching loss) just can be obtained.But thing is always difficult to so perfect.Being used for operating in the known control method of quasi-resonant mode at present, is mostly provide time of delay (delay time) T that a section fixing after trough starts
d, just open a power switch.Illustrate as Fig. 2, power switch 34 trough VL3 start one time of delay T
djust be unlocked afterwards.Here T time of delay
da kind of result of design, when IC manufacturing out after, be exactly a fixing immutable constant.If time of delay T
ddo not choose, do not match with whole switch type power supplying device, that switch cost would not be optimization.
Summary of the invention
Embodiment discloses a kind of power-supply controller of electric, is applicable to a switch type power supplying device.This switch type power supplying device includes a power switch.This power-supply controller of electric includes a feedback pin, a clamped circuit, a peak detector, a valley detection device and a delay circuit.This feedback pin can be electrically coupled to an auxiliary winding of a transformer.This clamped circuit is electrically connected to this feedback pin, and framework provides a strangulation electric current, with a voltage of this feedback pin of strangulation.This peak detector is electrically connected to this clamped circuit, and in order to produce a peak records, it is to should a peak value of strangulation electric current.This valley detection device is electrically connected to this feedback pin, and framework provides an entering signal, and it can point out a start time point of a voltage trough.This delay circuit framework, in order to after a time of delay appears in this entering signal, provides a triggering signal.This time of delay changes along with this peak records, and this triggering signal can open this power switch.
Embodiment discloses a kind of power-supply controller of electric, is applicable to a switch type power supplying device.This switch type power supplying device includes a power switch.This power-supply controller of electric includes a feedback pin, a clamped circuit, a bottom detector, a valley detection device and a delay circuit.This feedback pin can be electrically coupled to an auxiliary winding of a transformer.One voltage waveform of one cross-pressure of this auxiliary winding can provide a voltage trough.This clamped circuit is electrically connected to this feedback pin, and framework provides a strangulation electric current, with the voltage in this feedback pin of strangulation.This bottom detector framework provides a trough signal, and it approximately can point out the appearance of a lowest point of this voltage trough.This valley detection device is electrically connected to this feedback pin, and framework provides an entering signal, to point out a start time point of this voltage trough.This delay circuit framework provides a reference signal.This reference signal to should start time point start to terminate to this lowest point between optimization time of delay.This delay circuit, after a time of delay appears in this entering signal, provides a triggering signal.This time of delay is no longer than this optimization time of delay.This triggering signal can open this power switch.
Embodiment discloses a kind of control method being applicable to a switch type power supplying device.This switch type power supplying device includes a transformer and a power switch.This control method includes: provide a strangulation electric current, and with the voltage in strangulation one feedback pin, wherein, this feedback pin, by a resistance, be electrically connected to an auxiliary winding of this transformer, and a cross-pressure of this auxiliary winding can provide a voltage trough; Produce a peak records, it is roughly to should a peak value of strangulation electric current; There is provided an entering signal, it can point out a start time point of this voltage trough; According to this peak records, provide a lowest point signal, it approximately can point out the appearance of a lowest point of this voltage trough; One reference signal is provided, its to should start time point start to terminate to this lowest point between optimization time of delay; And be enabled at this lowest point signal, when pointing out that this lowest point starts, provide a triggering signal, it can open this power switch.A time of delay between this start time point is provided to this triggering signal, be no longer than this optimization time of delay.
Accompanying drawing explanation
Fig. 1 shows the switch type power supplying device 10 be operable under quasi-resonant mode.
Fig. 2 shows the waveform of some signals in Fig. 1.
Fig. 3 illustrates the power-supply controller of electric implemented according to the present invention.
Fig. 4 illustrates FB clamped circuit.
Fig. 5 illustrates peak detector.
Bottom detector in Fig. 6 exemplary graph 3.
Delay circuit in Fig. 7 exemplary graph 3.
Fig. 8 display power-supply controller of electric 26 in FIG replace by the power-supply controller of electric 60 in Fig. 3 time, the waveform of some of them signal.
[symbol description]
10 switch type power supplying devices
20 bridge rectifiers
24 loads
26 power-supply controller of electric
28 resistance
30 resistance
34 power switchs
60 power-supply controller of electric
62 FB clamped circuits
64 peak detectors
65 valley detection devices
66 depart from detector
68 enter detector
70 bottom detector
72 delay circuits
74 peak frequency limiters
76 opening time controllers
80 SR registers
90 NMOS
92 NMOS
94 comparators
96 SR registers
AUX assists winding
FB feedback pin
GATE drives pin
I
cLMPstrangulation electric current
P contact
PRM main winding
S
bOTTOMthe lowest point signal
S
eXITseparating signal
SEC primary side winding
S
mAX-Fobstruction signal
S
p-GATEsignal
S
qRDentering signal
S
qRD-TDtriggering signal
T
0, t
1, t
00, t
01, t
02, t
03, t
04, t
05, t
06, t
07, t
08, t
09, t
10time
T
dtime of delay
T
d-NEWtime of delay
T
moptimization time of delay
T
oFFshut-in time
T
oNopening time
V
adetect voltage
V
aUXcross-pressure
V
cCoperating power
V
dreference voltage
V
fBfeedback voltage signal
V
gATEdrive singal
V
iNinput power
VL1, VL2, VL3 trough
V
oUTout-put supply
V
psignal
V
pEAKpeak records
V
tDramp signal
Embodiment
Fig. 3 illustrates the power-supply controller of electric 60 implemented according to the present invention.The power-supply controller of electric 26 will replaced with power-supply controller of electric 60 in Fig. 1 below, as one embodiment of the invention, explains orally the operation of power-supply controller of electric 60.Power-supply controller of electric 60 can perform trough and switch, and is at cross-pressure V
aUXwhen being approximately the bottom being positioned at a voltage trough, open a power switch.Therefore, in some embodiments of the invention, switch cost may be able to minimize.
Power-supply controller of electric 60 has FB clamped circuit 62, peak detector 64, valley detection device 65, bottom detector 70, delay circuit 72, peak frequency limiter 74 and opening time controller 76.When power-supply controller of electric 60 replaces the power-supply controller of electric 26 in Fig. 1, feedback pin FB is electrically connected to auxiliary winding AUX by resistance 30.
Opening time controller 76 framework resets SR register (register) 80, and forbidden energy is driving the drive singal V on pin GATE
gATE, start shut-in time T by this
oFF.In certain embodiments, opening time T
oNlength, namely drive singal V
gATEthe time span be enabled, depends on and detects at an output (such as the out-put supply V in Fig. 1
oUT) on voltage or a signal producing of electric current.
As cross-pressure V
aUXwhen being negative value, FB clamped circuit 62 provides a strangulation electric current I
cLMP, be used for strangulation feedback voltage signal V
fBin 0V.FB clamped circuit 62 also provides ratio in strangulation electric current I
cLMPone detect voltage V
ato peak detector 64.Peak detector 64 trace detection voltage V
a, then produce a peak records V
pEAK, approximately correspond to and detect voltage V
aa peak value.In order to the peak value in subsequent voltage trough can be followed the trail of, at the end of a voltage trough, separating signal S
eXITcan be enabled, cause peak records V
pEAKbe reduced a little.Will illustrate after a while, when voltage trough is darker, peak records V
pEAKwill be larger.
Valley detection device 65 has one and enters detector 68 and a disengaging detector 66.Not being used in restriction this example of the present invention, at shut-in time T
oFFin, as feedback voltage signal V
fBwhen falling lower than 0.1V, enter detector 68 and will send a short pulse, as an entering signal S
qRD, point out a start time point of a voltage trough.Contrary, at shut-in time T
oFFin, as feedback voltage signal V
fBwhen increasing above 0.3V, depart from detector 66 and just send another short pulse, as a separating signal S
eXIT, point out an end time point of this voltage trough.0.3V and 0.1V is here only as an example, can replace along with the hobby in design with other numerical value.In certain embodiments, a start time point of a voltage trough can be at detection voltage V
atime more than a particular value, and an end time point of a voltage trough can be detect voltage V
awhen reducing to lower than another particular value.
Bottom detector 70 comparison peak value record V
pEAKwith detection voltage V
a, to provide a lowest point signal S
bOTTOM, be roughly used to refer to the appearance of a lowest point of a voltage trough.Apprehensible, just because of peak records V
pEAKwhat record is approximately detect voltage V
apeak value, and this peak value must be the lowest point appearing at a voltage trough, therefore, if the detection voltage V of a follow-up voltage trough
avery close to peak records V
pEAKtime, that is exactly represent that a lowest point of this follow-up voltage trough has probably occurred, so the lowest point signal S
bOTTOMjust be enabled.
At entering signal S
qRDafter appearance one time of delay T
d-NEWafter, delay circuit 72 provides a triggering signal S
qRD-TD.As shown in Figure 3, triggering signal S
qRD-TDcan arrange SR register 80, activation drives the drive singal V on pin GATE
gATE, open a power switch.With fixed delay time T of the prior art
ddifferent, T time of delay herein
d-NEWbe not a definite value, but may along with the lowest point signal S
bOTTOMand change.For example, time of delay T
d-NEWmay at the lowest point signal S
bOTTOMwhen being enabled, just unexpected termination.As peak records V
pEAKroughly can follow the trail of the peak value of subsequent voltage trough, therefore, the lowest point signal S
bOTTOMthe time point be enabled just may be different along with different voltage troughs, therefore, time of delay T
d-NEWlength will change.To explain after a while, this time of delay T
d-NEWthe time point that one the lowest point that can be considered as or be used for prediction one voltage trough occurs, therefore can be used for unlatching one power switch, use switch cost when reducing switch one power switch.
Peak frequency limiter 74 provides an obstruction signal S
mAX-F, to prevent triggering signal S
qRD-TDopen a power switch.For example, obstruction signal S
mAX-Fonly after switch periods is more than 16us, just can be enabled, the switching frequency that so just can limit a switch type power supplying device can not higher than 60KHz.
Fig. 4 illustrates FB clamped circuit 62, and wherein NMOS90 has a gate electrode to be probably biased in voltage V
nth, and voltage V
nthit is the critical voltage (threshold voltage) of NMOS90.If cross-pressure V
aUXbe negative value, NMOS90 can provide strangulation electric current I automatically
cLMP, strangulation feedback voltage signal V approximately
fBat 0V.According to strangulation electric current I
cLMP, the current mirror in Fig. 4 provides a mapping electric current, makes it flow through a resistance to produce detection voltage V
a.
Fig. 5 illustrates peak detector 64, wherein, as peak records V
pEAKthan detecting voltage V
ahour, NMOS92, to a capacitor charging, promotes peak records V
pEAK, therefore can trace detection voltage V
arising.As peak records V
pEAKwhat become equals or ratio detection voltage V
atime large, electric capacity is just no longer charged.Therefore, peak records V
pEAKcan represent and detect voltage V
aa peak value.If a voltage the lowest point is darker, represent that the lowest point of this voltage trough is more negative, strangulation electric current I
cLMPpeak value just need strangulation to live in feedback voltage signal V more greatly
fB, so peak records V
pEAKcan be larger.Separating signal S
eXITan end time point of this voltage trough can be pointed out, and can be used for making this capacitor discharge little by little, use at the end of a voltage trough, reduction peak records V slightly
pEAK.
Bottom detector 70 in Fig. 6 exemplary graph 3.As previously described, detect voltage V
avery close to peak records V
pEAKtime, the lowest point signal S
bOTTOMcan be enabled.In figure 6, comparator 94 compares and detects voltage V
awith peak records V
pEAK, and comparator 94 may have an offset voltage (offset volta in certain one end of its two input
ge).For example, as detection voltage V
asummation with 0.1V, increases above peak records V
pEAKtime, SR register 96 is just set, activation the lowest point signal S
bOTTOM, declare the beginning of a lowest point of a voltage trough.Similar, as detection voltage V
asummation with 0.1V, drops to lower than peak records V
pEAKtime, SR register 96 is just reset, forbidden energy the lowest point signal S
bOTTOM, declare the end of a lowest point of a voltage trough.In figure 6, drive singal S is followed in equivalence
gATEidentical signal S
p-GATE, can be used to reset SR register 96, because opening time T
oNbeginning, be equal to the end of a lowest point.
Delay circuit 72 in Fig. 7 exemplary graph 3.Entering signal S
qRDreset ramp signal V
tD, make it from 0V, increase rising.Therefore, ramp signal V
tDrepresent voltage trough and start rear the passed time.Reference voltage V
drepresent optimization T time of delay
m.Comparator in Fig. 7 can lose tune voltage (not shown) in certain one end in its two input.For example, as ramp signal V
tDlower than reference voltage V
d, but with reference voltage V
ddifference be not more than one preset offset voltage time, a short pulse will as triggering signal S
qRD-TDand be sent.In other words, if a voltage trough starts rear passed time is up reference voltage V
dcorresponding optimization T time of delay
m, triggering signal S
qRD-TDcan be enabled and have a short pulse, this short pulse may can open a power switch.This optimization T time of delay
mlimit after from a voltage trough, when really sending out short pulse to delay circuit 72, actual T time of delay
d-NEW.If reference voltage V
ddo not upgrade or change, that is quite determined, time of delay T
d-NEWoptimization T time of delay can never be longer than
m.
As the lowest point signal S
bOTTOMwhen being enabled, ramp signal V
tDupgrade reference voltage V
d.For example, reference voltage V
dbe updated with ramp signal V instantly
tDthe same.Meanwhile, triggering signal S
qRD-TDcan be enabled and have a short pulse, causing T time of delay
d-NEWthan optimization T time of delay
mthat comes is short.Reference voltage V
dfinally can have recorded, at the lowest point signal S
bOTTOMwhen being disabled, namely in that moment that a voltage trough terminates, ramp signal V
tDvalue.
Fig. 8 display power-supply controller of electric 26 in FIG replace by the power-supply controller of electric 60 in Fig. 3 time, the waveform of some of them signal.
At time t
00time, drive singal V
gATEbe disabled, signal V
p, cross-pressure V
aUX, and feedback voltage signal V
fBall promptly rise, start shut-in time T
oFF.
After transformer discharges completely, signal V
pwith cross-pressure V
aUXstart vibration.At time t
01, t
05with t
09time, cross-pressure V
aUXalmost drop to as negative value, so entering signal S
qRDjust there is short pulse, point out the beginning of voltage trough VL1, VL2 and VL3 respectively.Similar, at time t
04with t
07, cross-pressure V
aUXrise to general on the occasion of, separating signal S
eXITjust there is short pulse, be used to refer to the end of voltage trough VL1 and VL2.
As shown in Figure 8, with time t
02to t
03between period be example, peak records V
pEAKtrace detection voltage V
a.But, if detect voltage V
awhen reducing from the peak value of oneself, peak records V
pEAKremain unchanged.(time t at the end of voltage trough VL1 and VL2
04with t
07), via separating signal S
eXITtriggered, peak records V
pEAKa little is reduced because of capacitor discharge.
With time t
02to t
03between period be example, now the lowest point signal S
bOTTOMbe enabled, because detect voltage V
ato equal or very near peak records V
pEAK.
Ramp signal V
tDfrom time t
01start to start to rise with a fixed slope.At time t
02, the lowest point signal S
bOTTOMbe enabled, so reference voltage V
dby ramp signal V
tDupgraded.Reference voltage V
drenewal until the lowest point signal S
bOTTOMat time t
03be disabled rear just stopping.At time t
02, as reference voltage V
dwhat first time was updated follows ramp signal V
tDtime the same, triggering signal S
qRD-TDa short pulse is produced, as shown in Figure 8 with regard to being enabled.But, drive singal V
gATEstill rest on and be disabled, because obstruction signal S
mAX-Finstantly be disabled.Therefore, T time of delay produced in voltage trough VL1
d-NEWfrom t
01to t
02time, be by the lowest point signal S haply
bOTTOMdetermined, and the lowest point signal S
bOTTOMaccording to peak records V
pEAKand produce.From voltage trough, to the lowest point signal S
bOTTOMtill being disabled during this period of time, optimization T time of delay is called
m.Optimization T time of delay
mby reference voltage V
dremembered, so reference voltage V
dcorrespond to optimization T time of delay
m.
Produce the signal in the time of voltage trough VL1 above and illustrate, the signal that also can be extrapolated in the time of voltage trough VL2 produces and explanation.
As the lowest point signal S in Fig. 8
bOTTOMwaveform show, the lowest point signal S
bOTTOMfor the time span of activation, will in follow-up voltage trough, shorter and shorter.This is because detect voltage V
apeak value can reduce along with the increase of voltage trough, although and peak records V
pEAKreduction slightly at the end of each voltage trough, but peak records V
pEAKbut cannot forereach in time and detect voltage V
apeak value decrease speed.As shown in Figure 8, for from time t
09the voltage trough VL3 started, the lowest point signal S
bOTTOMfor the time span of activation, disappear completely, because peak records V
pEAKalways all higher than detection voltage V
a.Just, at time t
10, triggering signal S
qRD-TDstill be enabled, because ramp signal V
tDbe increased beyond reference voltage V
d, and reference voltage V
dbe updated in previous voltage trough and remembered optimization T time of delay
m.Note that the oscillating circuit that main winding PRM and parasitic capacitance are formed has a built-in oscillation cycle, optimization T time of delay
mlarge appointment is 1/4th of this cycle of oscillation, and optimization T time of delay
mfor each voltage trough, be all probably the same.This is also each optimization T time of delay why in Fig. 8
mreason all about the same.If triggering signal S
qRD-TDjust can start optimization T time of delay at a voltage trough
mafter be enabled, that quasi-resonant mode is almost perfect execution, can obtain optimized switch cost.What Fig. 8 showed is exactly such result, T time of delay wherein in voltage trough VL3
d-NEWbe exactly with optimization T time of delay
mjust the same.Triggering signal S
qRD-TDat time t
10be enabled, now obstruction signal S
mAX-Fbe enabled, so drive singal V
gATEjust and then be enabled, at time t
10open power switch.
Because at triggering signal S
qRD-TDsecond short pulse occur after time t
08, obstruction signal S
mAX-Fjust be enabled, so Fig. 8 display is switch at the trough of tertiary voltage trough VL3.Certainly, as long as obstruction signal S
mAX-Fearlier can be enabled, just can be implemented in the first or second voltage trough (VL1 or VL2) and implement trough switching.For example, obstruction signal S is supposed
mAX-Fdo sth. in advance time t in fig. 8
01just be enabled, that can inference, after living through several switch periods, and peak records V
pEAKbecause of the reason of signal propagation delay, finally can approximately will be stabilized in very near detecting voltage V
afirst peak value near.Just because of peak records V
pEAKwith detection voltage V
afirst peak value about the same, so time of delay T
d-NEWcan roughly with optimization T time of delay
mthe same, also reach optimized switch cost.
With T time of delay fixing in prior art
ddifferent, T time of delay in embodiments of the invention
d-NEWaccording to the lowest point signal S
bOTTOMand change adaptively, the lowest point signal S
bOTTOMcan along with peak records V
pEAKand adjust.According to above instruction and analysis, the time that the lowest point of a voltage trough occurs can be got up by memory, and the power-supply controller of electric therefore implemented according to the present invention in the optimized mode of one, can realize trough and switch, reduce the switch cost of power switch.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to claims of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (20)
1. a power-supply controller of electric, be applicable to a switch type power supplying device, it includes a power switch, and this power-supply controller of electric includes:
One feedback pin, can be electrically coupled to an auxiliary winding of a transformer;
One clamped circuit, is electrically connected to this feedback pin, and framework provides a strangulation electric current, with a voltage of this feedback pin of strangulation;
One peak detector, is electrically connected to this clamped circuit, and in order to produce a peak records, it is to should a peak value of strangulation electric current;
One valley detection device, is electrically connected to this feedback pin, and framework provides an entering signal, and it can point out a start time point of a voltage trough; And
One delay circuit, framework, in order to after a time of delay appears in this entering signal, provides a triggering signal, and wherein, this time of delay changes along with this peak records, and this triggering signal can open this power switch.
2. power-supply controller of electric as claimed in claim 1, wherein, this clamped circuit provides a detection voltage according to this strangulation electric current, and this peak detector follows the trail of a peak value of this detection voltage, to provide this peak records.
3. power-supply controller of electric as claimed in claim 2, also include a bottom detector, its framework compares this detection voltage and this peak records, to provide a lowest point signal, the appearance of what it was about a point out the lowest point of this voltage trough.
4. power-supply controller of electric as claimed in claim 3, wherein, this time of delay determines according to this trough signal.
5. power-supply controller of electric as claimed in claim 4, wherein, this delay circuit compares a ramp signal and a reference signal, decides this inhibit signal, and when this trough signal is enabled, this reference signal upgrades.
6. power-supply controller of electric as claimed in claim 5, wherein, when this entering signal is enabled, this ramp signal is reset.
7. power-supply controller of electric as claimed in claim 1, wherein, this valley detection device is provided a separating signal by framework, and it represents an end time point of this voltage trough.
8. power-supply controller of electric as claimed in claim 7, wherein, when this separating signal is enabled, this peak detector reduces this peak records.
9. power-supply controller of electric as claimed in claim 1, also includes:
One peak frequency limiter, in order to provide an obstruction signal, to prevent this triggering signal from opening this power switch, therefore can limit the switching frequency of this switch type power supplying device.
10. a power-supply controller of electric, be applicable to a switch type power supplying device, it includes a power switch, and this power-supply controller of electric includes:
One feedback pin, can be electrically coupled to an auxiliary winding of a transformer, wherein, a voltage waveform of a cross-pressure of this auxiliary winding can provide a voltage trough;
One clamped circuit, is electrically connected to this feedback pin, and framework provides a strangulation electric current, with the voltage in this feedback pin of strangulation;
One bottom detector, framework provides a trough signal, and it approximately can point out the appearance of a lowest point of this voltage trough;
One valley detection device, is electrically connected to this feedback pin, and framework provides an entering signal, to point out a start time point of this voltage trough; And
One delay circuit, framework provides a reference signal, this reference signal to should start time point start to terminate to this lowest point between optimization time of delay, and after a time of delay appears in this entering signal, provide a triggering signal;
Wherein, this time of delay is no longer than this optimization time of delay; And
This triggering signal can open this power switch.
11. power-supply controller of electric as claimed in claim 10, also include:
One peak detector, is electrically connected to this clamped circuit, and in order to produce a peak records, it is to should a peak value of strangulation electric current;
Wherein, this trough signal provides according to this strangulation electric current.
12. power-supply controller of electric as claimed in claim 11, wherein, this clamped circuit provides a detection voltage according to this strangulation electric current, and this peak detector follows the trail of a peak value of this detection voltage, to provide this peak records.
13. power-supply controller of electric as claimed in claim 12, wherein, this bottom detector compares this peak records and this detection voltage, provides this trough signal.
14. power-supply controller of electric as claimed in claim 10, wherein, this delay circuit compares a ramp signal and this reference signal, decides this time of delay.
15. power-supply controller of electric as claimed in claim 14, wherein, when this lowest point occurs, this delay circuit uses this ramp signal to upgrade this reference signal.
16. power-supply controller of electric as claimed in claim 10, wherein, this valley detection device framework provides a separating signal, and it represents an end time point of this voltage trough.
17. 1 kinds of control methods being applicable to a switch type power supplying device, this switch type power supplying device includes a transformer and a power switch, and this control method includes:
There is provided a strangulation electric current, with the voltage in strangulation one feedback pin, wherein, this feedback pin, by a resistance, be electrically connected to an auxiliary winding of this transformer, and a cross-pressure of this auxiliary winding can provide a voltage trough;
Produce a peak records, it is roughly to should a peak value of strangulation electric current;
There is provided an entering signal, it can point out a start time point of this voltage trough;
According to this peak records, provide a lowest point signal, it approximately can point out the appearance of a lowest point of this voltage trough;
One reference signal is provided, its to should start time point start to terminate to this lowest point between optimization time of delay; And
Be enabled at this lowest point signal, when pointing out that this lowest point starts, provide a triggering signal, it can open this power switch;
Wherein, the time of delay between this start time point is provided to this triggering signal, this optimization time of delay is no longer than.
18. control methods as claimed in claim 17, also include:
According to this entering signal, provide a ramp signal; And
When this lowest point occurs, upgrade this reference signal with this ramp signal.
19. control methods as claimed in claim 18, include:
According to this strangulation electric current, provide a detection voltage;
Follow the trail of this detection voltage, to provide this peak records; And
Relatively this detection voltage and this peak records, produce this lowest point signal.
20. control methods as claimed in claim 18, include:
There is provided a separating signal, it represents an end time point of this voltage trough; And
According to this separating signal, reduce this peak records.
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| CN104734542B (en) | 2017-07-07 |
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Denomination of invention: Power source controller switched at trough bottom of voltage trough and related control method Effective date of registration: 20200618 Granted publication date: 20170707 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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