CN1862935A - Output power compensating method and switching controller - Google Patents
Output power compensating method and switching controller Download PDFInfo
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- CN1862935A CN1862935A CNA2005100701746A CN200510070174A CN1862935A CN 1862935 A CN1862935 A CN 1862935A CN A2005100701746 A CNA2005100701746 A CN A2005100701746A CN 200510070174 A CN200510070174 A CN 200510070174A CN 1862935 A CN1862935 A CN 1862935A
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Abstract
The invention discloses the method of output power compensation of the power supply server and the switch controller, the one wave generator is used to connect the oscillator, the sawtooth wave signal is receipted to output the period three segment limiting signal; the period three segment limiting signal is send to the comparing unit. The comparing unit receives the one current measuring signal and the said period limiting signal, then it can be used to output one resetting signal; the one synchronous signal output unit connects to the said the comparing unit, the oscillator and the one power switch, the reset signal and the one pulse signal is recepted, the pulse signal is in-phase to output the one driving signal to the power switch, so the output power compensation of the power supplier during the high, the low output voltage can be realized.
Description
Technical field
The present invention is relevant for a kind of method and switching control device of output power back off, especially refer to a kind of periodicity three sections restrictions signal of output and the current sense signal of obtaining computing of making comparisons that in power supply unit, utilizes, as the method and the switching control device thereof of output power back off under the high and low input voltage of power supply unit.
Background technology
Pulse-width modulation PWM is a known technology, is used for controlling and the stable power output of adjusting power supply unit.Power supply unit must provide various defencive functions, as overvoltage, overcurrent and overpower protection.Overcurrent and overpower protection are used for protecting power supply unit and peripheral circuit, to avoid causing nonvolatil injury.And in the overpower protection, the function of design output power back off has identical overload protection point as power supply unit under high and low input voltage.
Please refer to Fig. 1, be known power supply unit circuit diagram.Power supply unit uses a PWM controller U
1Come power controlling switch Q
1Switching.One detects resistance R
SWith power switch Q
1Be connected in series, be used for obtaining and flow through power switch Q
1Primary side switch current I
P, this detects resistance R
SResistance value in order to the decision power supply unit peak power output.This primary side switch current I
PFlow through the detection resistance R
S, and detecting resistance R
SLast generation one current sense signal V
CSPWM controller U
1One of current sense end VS be connected in this detection resistance R
S, receive this current sense signal V
CS, and see through a Power Limitation comparator 130 and a max power constraint voltage V
MCompare computing, if current sense signal V
CSGreater than max power constraint voltage V
M, PWM controller U
1To periodically stop using and drive signal V
PWMOutput, and then the restriction and the decision power supply unit peak power output.
Multiple with reference to figure 1, as power switch Q
1During conducting, be stored in transformer T
1Energy ε on the inductance can be expressed as:
Flow through transformer T
1Primary side switch current I
PCan be expressed as:
Peak power output P can be expressed as:
This I wherein
PWith L
PBe expressed as transformer T respectively
1Primary side switch current and primary side inductance value; t
OnBe power switch Q
1During conducting, drive signal V
PWMON time; T
SFor driving signal V
PWMSwitching cycle.From top formula (2) as can be known, input voltage V
INSize can influence transformer T
1The primary side switch current I that primary side is set up
P, it is fast that higher input voltage is then set up speed, and it is slow that lower input voltage is then set up speed.This current sense signal V
CSWith this max power constraint voltage V
MThe computing of making comparisons is in order to the peak power output P of restriction with the decision power supply unit.
Because above-mentioned formula (3) can be learnt the size of power supply unit power output P and power switch Q
1ON time t
OnWith input voltage V
INRelevant.And when considering safety (safety), the actual input voltage V of power supply unit
INScope by 90Vac to 264Vac, and high and low input voltage between the difference of several times is often arranged.Yet the back coupling control loop that sees through power supply unit can automatically be adjusted ON time t
On, and make the power output P value of being maintained fixed.That is to say, as current sense signal V
CSBe higher than max power constraint voltage V
MThe time, maximum ON time will be restricted this moment, and reach limiting transformer T
1Primary side switch current I
P
Cooperate Fig. 1, please refer to Fig. 2, for the known propagation delay time causes the power output under the high and low input voltage to limit the different schematic diagram of (not compensating) accurate potential difference.Known employed Power Limitation is utilized max power constraint voltage V usually
M, for example the voltage quasi position of 1V come with current sense end VS on current sense signal V
CSMake comparisons, if the current sense signal V on the current sense end VS
CSGreater than 1V, this PWM controller U then
1To stop output in output OUT and drive signal V
PWMTo this power switch Q
1, in order to the peak power output P of restriction with the decision power supply unit.
Yet peak power output also is subjected to PWM controller U
1Propagation delay time t
dInfluence-.Multiple with reference to figure 2, power supply unit is at fixing max power constraint voltage V
MWhen working, high input voltage can produce the steeper current sense signal V of slope down,
CS, HVWith lasting ON time t
On1Short driving signal V
PWM, HVMoreover, when working, low input can produce the slow current sense signal V of slope
CS, LVWith lasting ON time t
On2Long driving signal V
PWM, LVIn fact, as current sense signal V
CSBe higher than max power constraint voltage V
MMoment, this PWM controller U
1Driving signal V
PWMCan be through one section propagation delay time t
dAfter just can end.At this propagation delay time t
dIn, power switch Q
1Continue conducting, and will continue transmitted power.Therefore, Shi Ji driving signal V
PWMON time t
OnEqual t
On+ t
d, and no matter be under high and low input voltage, in identical power supply unit, its propagation delay time t
dSize be identical.
So power supply unit under high input voltage, actual Power Limitation voltage V
M, HVPower Limitation voltage V when understanding than low input
M, LVHeight makes power supply unit can cause the very big difference of power output when high and low input voltage.And actual power output P is shown below:
Compare aforesaid equation (3) and (4), because PWM controller U
1Inner propagation delay time t
dWill make exciting curent many (V than theoretical value
IN/ L
P) * t
d, therefore, bigger Power Limitation voltage in the time of when high input voltage, will having with respect to low input.Though should propagation delay time t
dVery short, usually between the scope of 200ns to 350ns, and under the higher switching frequency, this propagation delay time t
dTo the more shape aggravation of power output difference that high and low input voltage caused.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of method and switching control device that is used in the output power back off in the power supply unit, in power supply unit, utilize periodically the computing of making comparisons of three sections restriction signals and the current sense signal of obtaining, and then reach the compensation of power supply unit power output under high and low input voltage.
The switching control device of output power back off of the present invention is used in the power supply unit, sees through one and detects the primary side switch current that resistance captures the power switch of flowing through, as the change action of this power switch of control.Switching control device uses an oscillator to connect a waveform generator, and this oscillator is exported a sawtooth waveforms signal and a pulse wave signal, and transmits the sawtooth waveforms signal to this waveform generator.This waveform generator converts the sawtooth waveforms signal output of to three sections restrictions of one-period property signal; One comparing unit is connected in this detection resistance and this waveform generator, receives three sections restrictions of a current sense signal and this periodicity signal, in order to export a replacement signal; An and synchronous signal output unit, be connected in this comparing unit, this oscillator and this power switch, receive this replacement signal and this pulse wave signal, and this pulse wave signal drives signal to this power switch, as the compensation of power output under the high and low input voltage of power supply unit to export one synchronously.
The present invention is used in the method for output power back off in the power supply unit, detects the flow through primary side switch current of a power switch of resistance detection prior to seeing through one in the power supply unit, and obtains a current sense signal in detecting on the resistance; Provide three sections of one-period property restriction signal by waveform generator then, provide a voltage rise limitation signal in the cycle earlier in a signal, and will compare computing with this current sense signal; Waveform generator then provides a voltage limit signal again, and will compare computing with this current sense signal; Waveform generator provides the voltage restriction signal that descends at last again, and will compare computing with this current sense signal.
So, the current sense signal V of power supply unit when high and low input voltage
CS, can and the comparison operation of voltage rise limitation signal, as power supply unit under high and low input voltage, the compensation of different output power.
Simultaneously, the present invention utilizes waveform generator that the voltage limit signal is provided, and limits the maximum power of power supply unit.And, the present invention utilizes waveform generator to provide voltage to descend and limits signal, limit power supply unit in the maximum power of crossing low input, to reduce power supply unit in that to spend the following work period that is produced the driving signal of low input excessive and cause the output overpower.
Being noted that above general introduction and ensuing detailed description are all exemplary in nature, is in order to further specify claim of the present invention.And about other purpose of the present invention and advantage, will be set forth in follow-up explanation and accompanying drawing.
Description of drawings:
Fig. 1 is known power supply unit circuit diagram;
Fig. 2 causes the power output under the high low input to limit the different schematic diagram of accurate potential difference for known transmission time of delay;
Fig. 3 is used in the circuit diagram of power supply unit for the present invention;
The waveform generator internal circuit schematic diagram that Fig. 4 uses for the present invention;
The inner waveform schematic diagram of waveform generator that Fig. 5 uses for the present invention;
Another block schematic diagram of waveform generator that Fig. 6 uses for the present invention.
Symbol description among the figure:
The known technology label:
U
1PWM controller Q
1Power switch
T
1Transformer R
SDetect resistance
Label of the present invention:
Q
1Power switch T
1Transformer
R
SDetect resistance 50 oscillators
60 waveform generators
61 first voltages are to current conversion unit
62 second voltages are to current conversion unit
601,602,603,604,605,606 transistors
608 mnemons
609 dac
200 comparing units
270 sync signal output units, 230 power comparators
240 pulse-width modulation control units, 250 logical circuits
Embodiment
Please refer to Fig. 3, be used in the circuit diagram of power supply unit for the present invention.The present invention has the switching control device of output power back off, is used in the power supply unit, and power supply unit uses switching control device of the present invention to come power controlling switch Q
1To transformer T
1Switching.Simultaneously, one detect resistance R
SWith power switch Q
1Be connected in series, be used for obtaining and flow through power switch Q
1Primary side switch current I
P, and produce a current sense signal V
CSSwitching control device of the present invention sees through and detects resistance R
SObtain current sense signal V
CS, after computing and then control this power switch Q
1Change action.
The present invention utilizes an oscillator 50 to connect a waveform generator 60, oscillator 50 outputs one sawtooth waveforms signal V
SAWWith a pulse wave signal PLS, and transmit sawtooth waveforms signal V
SAWTo this waveform generator 60.This waveform generator 60 receives this sawtooth waveforms signal V
SAW, in order to three sections restrictions of output one-period property signal V
LMTUse a comparing unit 200 simultaneously, be connected in this detection resistance R
SWith this waveform generation 60, received current sensing signal V
CSWith three sections restrictions of this periodicity signal V
LMT, in order to export a replacement signal RST; And a synchronous signal output unit 270, be connected in this comparing unit 200, this oscillator 50 and this power switch Q
1, receive this replacement signal RST and this pulse wave signal PLS, export one in order to synchronous this pulse wave signal PLS and drive signal V
PWMTo this power switch Q
1
Multiple in one of the present invention embodiment, this comparing unit 200 is a power comparator 230 with reference to figure 3, and the one anode is connected in these waveform generator 60, one negative terminals and is connected in this detection resistance R
S, an output is connected in this sync signal output unit 270.In this embodiment, the present invention utilizes three sections restrictions of these power comparator 230 receiving cycles signal V
LMTWith this current sense signal V
CS, and will compare computing, export this control enable signal V
OC(being replacement signal RST) is to this sync signal output unit 270.
Multiple with reference to figure 3, in another embodiment of the present invention, this comparing unit 200 further is connected to one of power supply unit voltage back coupling end FB, in order to capture a feedback voltage signal V
FBWherein this competitive list 200 is except having the power ratio described in the embodiment of front than 230, and more include: a pulse-width modulation control unit 240 is connected in negative terminal, this detection resistance R of this power comparator 230
SAnd this voltage back coupling end FB, receive this current sense signal V
CSWith this feedback voltage signal V
FB, output one modulation signal V after inner comparison operation
OPOne logical circuit 250 is connected to this power comparator 230, this pulse-width modulation control unit 240 and this sync signal output unit 270, receives this control enable signal V
OCWith this modulation signal V
OP, RST arrives this sync signal output unit 270 in order to output replacement signal.In this embodiment, the present invention utilizes logical circuit 250 output replacement signal RST to this sync signal output unit 270, and this sync signal output unit 270 is this pulse wave signal PLS synchronously, and output drives signal V
PWMTo this power switch Q
1, to carry out Switch Control.
Cooperate Fig. 3, please refer to Fig. 4, be waveform generator internal circuit schematic diagram of the present invention.Waveform generator 60 includes one first voltage current conversion unit 61 is connected to this oscillator 50, receives sawtooth waveforms signal V
SAW, and with sawtooth waveforms signal V
SAWThe magnitude of voltage equal proportion convert a sawtooth current I to
SAW, can be expressed as:
R wherein
ABe the resistance value of first voltage to current conversion unit 61.One first current mirror is connected to first voltage to current conversion unit 61, receives this sawtooth current I
SAW, this first current mirror is made up of a first transistor 601 and a transistor seconds 602.The first transistor 601 is connected with the grid of transistor seconds 602, and the drain electrode of the first transistor 601 is connected to its grid.First voltage is to current conversion unit 61 output sawtooth current I
SAWFlow into the drain electrode of the first transistor 601, and produce one first reflection electric current I at the drain electrode reflection of transistor seconds 602
1, its value can be obtained by following formula.
I
1＝N
1×I
SAW (6)
N wherein
1It is the reflection ratio of first current mirror.The first transistor 601 also is connected with the source electrode of transistor seconds 602, and is connected to a restriction current source I again
TTherefore, the first reflection electric current I of first current mirror output
1Lowest high-current value by restriction current source I
TLimit.
N
1×I
SAW≤I
T (7)
Waveform generator 60 more includes one second voltage to current conversion unit 62, receives a reference voltage V
REF, and with reference voltage V
REFThe magnitude of voltage equal proportion convert a reference current I to
REF, can be expressed as:
I
REF＝V
REF/R
B (8)
R wherein
BBe the resistance value of second voltage to current conversion unit 62.One second current mirror is connected to second voltage to current conversion unit 62, receives this reference current I
REF, second current mirror is made up of one the 3rd transistor 603 and one the 4th transistor 604.The source electrode of the 3rd transistor 603 and the 4th transistor 604 is connected to earth terminal GND, and the 3rd transistor 603 is connected with the grid of the 4th transistor 604.The drain electrode of the 3rd transistor 603 is connected to its grid.Second voltage is to the reference current I of current conversion unit 62 outputs
REFFlow into the drain electrode of the 3rd transistor 603, and produce one second reflection electric current I at the drain electrode reflection of the 4th transistor 604
2, its value can be obtained by following formula.
I
2＝N
2×I
REF (9)
N wherein
2It is the reflection ratio of second current mirror.
One the 5th transistor 605 and one the 6th transistor 606 are formed one the 3rd current mirror.The source electrode of the 5th transistor 605 and the 6th transistor 606 is connected to a supply voltage V
CCThe 5th transistor 605 is connected with the grid of the 6th transistor 606, and the drain electrode of the 5th transistor 605 is connected to its grid.The first reflection electric current I
1With the second reflection electric current I
2Flow into the drain electrode of the 5th transistor 605, and produce a Power Limitation electric current I at the drain electrode reflection of the 6th transistor 606
LMTThis Power Limitation electric current I
LMTIts value can be obtained by following formula.
I
LMT＝N
3×(I
1+I
2) (10)
N wherein
3It is the reflection ratio of the 3rd current mirror.This Power Limitation electric current I
LMTFlow through a Power Limitation resistance R
LMT, to produce three sections restrictions of this periodicity signal V
LMT, shown in equation (11):
V
LMT＝I
LMT×R
LMT (11)
Please refer to Fig. 5, be waveform generator internal circuit waveform schematic diagram of the present invention.Cooperate aforementioned formula (5) to formula (7), can know the first reflection electric current I
1By sawtooth current I
SAWReflection ratio N according to first current mirror
1The generation of videoing is therefore in time T
0-T
1During this time, the first reflection electric current I
1With sawtooth current I
SAWWaveform identical with slope.But in time T
1-T
2During this time, sawtooth current I
SAWContinue to increase, and the first reflection electric current I
1Be subject to restriction current source I
T, make the reflection electric current I of winning
1Be stabilized in a fixing potential value I
ThBy the time time T
2The time, the first reflection electric current I
1Just recover again along with sawtooth current I
SAWReflection ratio N with first current mirror
1Reflection produces.So, the first reflection electric current I
1The periodicity output waveform form the waveform output kenel of syllogic.
Moreover, cooperate aforementioned formula (10), the Power Limitation electric current I
LMTBy the first reflection electric current I
1With the second reflection electric current I
2Summation, and with the reflection ratio N of the 3rd current mirror
3Reflection produces.The second reflection electric current I
2With the first reflection electric current I
1Current potential draw high, draw high the reflection of first behind current potential electric current I
1Again with the reflection ratio N of the 3rd current mirror
3Reflection produces the Power Limitation electric current I
LMTSo, the Power Limitation electric current I
LMTIts waveform also is the kenel that presents the output of syllogic waveform.And cooperate aforementioned formula (11), this Power Limitation electric current I
LMTFlow through the Power Limitation resistance R
LMT, to produce three sections restrictions of this periodicity signal V
LMT
The present invention utilizes periodically three sections restriction signal V of waveform generator 60 outputs especially
LMT, be used for and current sense signal V
CSThe computing of making comparisons.At three sections restrictions of periodicity signal V
LMTOne of signal in the cycle, three sections restriction signal V periodically
LMTForm by a voltage rise limitation signal, a voltage limit signal and voltage decline restriction signal.
Power supply unit is the higher current sense signal V of slope that obtains capable of feedback under high input voltage
CS, HV, obtain the lower current sense signal V of slope in the next back coupling of low input
CS, LVNo matter power supply unit is in high or low input voltage (actual input voltage V
INScope by 90Vac to 264Vac), the current sense signal all can with three sections restriction signal V periodically
LMTThe computing of making comparisons of voltage rise limitation signal.Power supply unit in high input voltage following the higher current sense signal V of the slope that produces
CS, HVCan push up periodically three sections restriction signal V very soon
LMTVoltage rise limitation signal and with the computing of making comparisons, and than low input following the lower current sense signal V of the slope that produces
CS, LVCan slowly push up periodically three sections restriction signal V
LMTVoltage rise limitation signal and with the computing of making comparisons.
In fact, when high input voltage following the higher current sense signal V of the slope that produces
CS, HVOr low input following the lower current sense signal V of the slope that produces
CS, LVBe higher than periodically three sections restriction signal V
LMTMoment of voltage rise limitation signal, the PWM controller U that power supply unit uses
2Driving signal V
PWMCan be through one section propagation delay time t
dAfter just can end.At this propagation delay time t
dIn, power switch Q
1Continue conducting, and will continue transmitted power.Simultaneously, in identical power supply unit, its propagation delay time t
dSize be identical.
In the above-mentioned explanation, because the higher current sense signal V of slope
CS, HVPush up periodically three sections restriction signal V earlier
LMTVoltage rise limitation signal, and drive signal V
PWM, HVCan be through one section propagation delay time t
dAfter just can end and the lower current sense signal V of slope
CS, LVThe slow periodically three sections restriction signal V that push up
LMTVoltage rise limitation signal, and drive signal V
PWM, LVCan magnify relatively, and through one section propagation delay time t
dAfter just can end.
Three sections restrictions of periodic signal V
LMTVoltage rise limitation signal as the restriction power output of power supply unit under high and low input voltage, can allow the higher current sense signal V of slope
CS, HVOr the lower current sense signal V of slope
CS, LVAt the actual propagation delay time t that considers
dThe time, have identical actual power limit point Va.So get final product the power output difference that the offset supply supply is caused under high and low input voltage, allow power supply unit work under the different input supply voltage situation of high and low pressure, can obtain identical power output.
The composite Fig. 3 that closes with reference to figure 5, crosses (it is following to continue to keep the low 70Vac of input voltage) when low when the power supply unit input voltage, and it passes through power switch Q
1Primary side switch current I
PIt is slow to set up speed, makes electric current feedback signal V
CS, BOSet up slowly.So when the power supply unit input voltage is crossed the electric current back coupling signal V that is produced when hanging down
CS, BO, can be subjected to periodically three sections restriction signal V
LMTThe voltage restriction signal that descends limit, and then make power switch Q ahead of time
1End.
Please refer to Fig. 6, be another block schematic diagram of waveform generator of the present invention.Wherein this waveform generator 60 includes: a mnemon 608 stores many group numerical datas; And a dac 609, be connected in this mnemon 608, according to this periodicity three section restriction signal V of this pulse wave signal PLS in order to the numerical data in this mnemon 608 is converted into simulation
LMTMnemon 608 can be a read-only memory (ROM), numerical data is much organized in burning in advance, and see through dac 609 when each this pulse wave signal PLS enters, produce the set of number data and offer three sections restrictions of this periodicity signal V that dac 609 is converted to simulation
LMTOutput.
With reference to figure 3, illustrate that next the present invention is used in the method for output power back off in the power supply unit again, its power compensating method is a detection resistance R in the acquisition power supply unit
SOne of go up current sense signal V
CSProvide one-period to have descend three sections restriction signals of restriction signal of voltage rise limitation signal, voltage limit signal and voltage by waveform generator 60 then, and will with this current sense signal V
CSSee through a power comparator 230 and compare computing.So, the current sense signal V of power supply unit when high and low input voltage
CSMeeting and the comparison operation of voltage rise limitation signal make power supply unit can reach identical power output under high and low input voltage.
Simultaneously, the present invention can also utilize waveform generator 60 that three sections voltage limit signal and current sense signal V in the restriction signal are provided
CSThe computing of making comparisons is as the Power Limitation of power supply unit.And the voltage that the present invention can also utilize waveform generator 60 to provide descends and limits signal and current sense signal V
CSThe computing of making comparisons was in order to limit under the low input work period of the driving signal of power supply unit.
In the above-mentioned explanation, this current sense signal V
CSIf be higher than this voltage limit signal or voltage rise limitation signal or voltage decline restriction signal, then power supply unit can be exported by power-limiting, as the compensation of power output.
In sum, the present invention is used in the method and the switching control device of the output power back off in the power supply unit, in power supply unit, utilize the computing of making comparisons of periodicity three sections restrictions signal of output and the current sense signal of obtaining, and then reach the compensation of power supply unit power output under high and low input voltage, be used for improving prior art under the high and low input voltage different situations of power supply unit, the power output difference that is caused and the consumption of power output.
The above, only be the detailed description and the accompanying drawing of a specific embodiment of the best of the present invention, only feature of the present invention is not limited thereto, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with described claim, all closing in the embodiment of the spirit variation similar of the present patent application claim with it, all should be contained in the category of the present invention, anyly be familiar with this skill person in the field of the invention, can think easily and variation or modify all can be encompassed within the claim of this case.
Claims (11)
1. the method for an output power back off is used in the power supply unit, it is characterized in that, this step includes:
Capture a current sense signal;
One voltage rise limitation signal is provided, and it and this current sense signal are compared computing;
One voltage limit signal is provided, and it and this current sense signal are compared computing; And
Provide a voltage to descend and limit signal, and it and this current sense signal are compared computing.
2. the method for output power back off as claimed in claim 1 is characterized in that, in acquisition current sense signal step, this current sense signal is got by a primary side switch current that detects resistance reception power supply unit.
3. the method for output power back off as claimed in claim 1 is characterized in that, this current sense signal is if be higher than this voltage rise limitation signal or voltage limit signal or voltage decline restriction signal, and then this power supply unit can power-limiting output.
4. the method for output power back off as claimed in claim 1 is characterized in that, provides this voltage rise limitation signal, this voltage limit signal and this voltage to descend and limits signal, forms three sections restriction signals.
5. the method for output power back off as claimed in claim 4 is characterized in that, these three sections restriction signals and this current sense signal see through a power comparator and compare computing.
6. the switching control device with output power back off is used in the power supply unit, sees through one and detects the primary side switch current that resistance captures the power switch of flowing through, and it is characterized in that, includes:
One oscillator is exported a sawtooth waveforms signal and a pulse wave signal;
One waveform generator is connected in this oscillator, receives this sawtooth waveforms signal, in order to three sections restrictions of output one-period property signal;
One comparing unit is connected in this detection resistance and this waveform generator, receives three sections restrictions of a current sense signal and this periodicity signal, in order to export a replacement signal; And
One synchronous signal output unit is connected in this comparing unit, this oscillator and this power switch, receives this replacement signal and this pulse wave signal, and in order to be synchronized with this pulse wave signal, output one drives signal to this power switch.
7. the switching control device with output power back off as claimed in claim 6, it is characterized in that this comparing unit is a power comparator, the one anode is connected in this waveform generator, one negative terminal is connected in this detection resistance, and an output is connected in this sync signal output unit.
8. the switching control device with output power back off as claimed in claim 6 is characterized in that, this comparing unit further is connected to one of power supply unit voltage back coupling end, includes:
One power comparator is connected in this waveform generator and this detection resistance, receives three sections restrictions of this current sense signal and this periodicity signal, in order to export a control enable signal;
One pulse-width modulation control unit is connected in this detection resistance and this voltage back coupling end, receives this a current sense signal and a feedback voltage signal, exports a modulation signal; And
One logical circuit is connected to this power comparator, this pulse-width modulation control unit and this sync signal output unit, receives this control enable signal and this modulation signal, in order to export this replacement signal to this sync signal output unit.
9. the switching control device with output power back off as claimed in claim 6 is characterized in that, this waveform generator includes:
One first voltage is connected to this oscillator to current conversion unit, receives this sawtooth waveforms signal, and the magnitude of voltage ratio of this sawtooth waveforms signal is changed into a sawtooth current;
One first current mirror is connected to this first voltage to a current conversion unit and a restriction current source, produce one first reflection electric current according to this sawtooth current reflection, and this first reflection current limited limits current source in this;
One second voltage is converted into reference current output to current conversion unit with a reference voltage;
One second current mirror is connected to this first current mirror and this second voltage to current conversion unit, produces one second reflection electric current according to this reference current;
One the 3rd current mirror is connected in this first current mirror and this second current mirror, according to the summation of this first reflection electric current and this second reflection electric current, to produce a Power Limitation electric current; And
One Power Limitation resistance is connected in the 3rd current mirror, receives this Power Limitation electric current, in order to produce three sections restrictions of this periodicity signal.
10. the switching control device with output power back off as claimed in claim 6, it is characterized in that, three sections restrictions of this periodicity signals, include in the cycle in a signal: a voltage rise limitation signal, a voltage limit signal and a voltage descend and limit signal.
11. the switching control device with output power back off as claimed in claim 6 is characterized in that, this waveform generator includes:
One mnemon stores many group numerical datas; And
One dac is connected in this mnemon and this oscillator, according to this pulse wave signal, in order to three sections restrictions of this periodicity signal that the numerical data in this mnemon is converted into simulation.
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|---|---|---|---|
| CN2005100701746A CN1862935B (en) | 2005-05-09 | 2005-05-09 | Output power compensating method and switching controller |
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|---|---|---|---|
| CN2005100701746A CN1862935B (en) | 2005-05-09 | 2005-05-09 | Output power compensating method and switching controller |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101689807B (en) * | 2007-06-11 | 2012-11-21 | 三垦电气株式会社 | Multi-output switching power supply device |
| CN102969697A (en) * | 2011-09-02 | 2013-03-13 | 通嘉科技股份有限公司 | Control method for overvoltage protection and control circuit used for power supply controller |
| CN103762849A (en) * | 2013-01-08 | 2014-04-30 | 崇贸科技股份有限公司 | Control circuit of adjustable power supply |
| CN104079174A (en) * | 2013-03-28 | 2014-10-01 | 英飞凌科技奥地利有限公司 | Switched mode power supply |
| TWI663818B (en) * | 2017-08-28 | 2019-06-21 | 強弦科技股份有限公司 | Switching power supply having dynamically adjustable feedback compensation function |
| CN112054658A (en) * | 2020-09-16 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Control method and control circuit of switching power supply circuit and switching power supply |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3748262B2 (en) * | 2003-06-24 | 2006-02-22 | ローム株式会社 | Switching type DC-DC converter |
| JP2005051956A (en) * | 2003-07-31 | 2005-02-24 | Rohm Co Ltd | Dc-dc converter |
| CN2794030Y (en) * | 2005-05-10 | 2006-07-05 | 崇贸科技股份有限公司 | Switching controller with outputting powr compensation |
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2005
- 2005-05-09 CN CN2005100701746A patent/CN1862935B/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101689807B (en) * | 2007-06-11 | 2012-11-21 | 三垦电气株式会社 | Multi-output switching power supply device |
| CN102969697A (en) * | 2011-09-02 | 2013-03-13 | 通嘉科技股份有限公司 | Control method for overvoltage protection and control circuit used for power supply controller |
| CN102969697B (en) * | 2011-09-02 | 2015-07-15 | 通嘉科技股份有限公司 | Control method for overvoltage protection and control circuit used for power supply controller |
| US9921627B2 (en) | 2013-01-08 | 2018-03-20 | Semiconductor Components Industries, Llc | Control circuit for programmable power supply |
| CN103762849A (en) * | 2013-01-08 | 2014-04-30 | 崇贸科技股份有限公司 | Control circuit of adjustable power supply |
| US10969845B2 (en) | 2013-01-08 | 2021-04-06 | Semiconductor Components Industries, Llc | Control circuit for programmable power supply |
| CN103762849B (en) * | 2013-01-08 | 2016-08-17 | 崇贸科技股份有限公司 | One control circuit of adjustment type power supply unit |
| US10401929B2 (en) | 2013-01-08 | 2019-09-03 | Semiconductor Components Industries, Llc | Control circuit for programmable power supply |
| US9564810B2 (en) | 2013-03-28 | 2017-02-07 | Infineon Technologies Austria Ag | Switched mode power supply |
| CN104079174B (en) * | 2013-03-28 | 2017-06-23 | 英飞凌科技奥地利有限公司 | Switched-mode power supply |
| CN104079174A (en) * | 2013-03-28 | 2014-10-01 | 英飞凌科技奥地利有限公司 | Switched mode power supply |
| TWI663818B (en) * | 2017-08-28 | 2019-06-21 | 強弦科技股份有限公司 | Switching power supply having dynamically adjustable feedback compensation function |
| CN112054658A (en) * | 2020-09-16 | 2020-12-08 | 杰华特微电子（杭州）有限公司 | Control method and control circuit of switching power supply circuit and switching power supply |
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