CN1964172A - A switch-over type control device for output power compensation - Google Patents
A switch-over type control device for output power compensation Download PDFInfo
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- CN1964172A CN1964172A CN 200510115655 CN200510115655A CN1964172A CN 1964172 A CN1964172 A CN 1964172A CN 200510115655 CN200510115655 CN 200510115655 CN 200510115655 A CN200510115655 A CN 200510115655A CN 1964172 A CN1964172 A CN 1964172A
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Abstract
The related switch controller for output power compensation comprises: an oscillator to output an impulse signal, a waveform generation unit to receive the impulse signal and output a power limit signal, an impedance unit to decide the slope of the limit signal, a comparison unit to output a reset signal, and an output unit to receive the reset signal and impulse signal and output a drive signal to the power switch. This invention can obtain same output power for different input power voltages.
Description
Technical field
The present invention relates to a kind of switching control device that utilizes the impedance adjustment to reach output power back off, refer to a kind of resistance of adjusting an impedance unit of in power supply unit, utilizing especially, as the switching control device of power supply unit output power back off.
Background technology
Pulse width modulating technology is an existing technology, in order to control 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.In the overpower protection of power supply unit,, can make power supply unit that identical overload protection point is arranged under high and low input voltage by the design of output power back off function.
See also Fig. 1, it is existing power supply unit circuit diagram.In the power supply unit, a PWM controller 1 is according to feedback signal V
FBIn order to export a control signal V
G', this control signal V
G' power controlling switch Q switching transformer T, and then the stable output voltage V of adjusting power supply unit
OOne detects resistance R
SQ is connected in series with power switch, to obtain the primary side switch current I that flows through power switch Q
PPrimary side switch current I
PFlow through and detect resistance R
S, and detecting resistance R
SLast generation one current sensing signal V
S, current sensing signal V
SCan determine the peak power output of power supply unit.
See also Fig. 2, be existing PWM controller internal circuit block schematic diagram.PWM controller 1 uses a Power Limitation comparator 11 to be connected in this and detects resistance R
SIn order to receive this current sensing signal V
S, and comparison operation current sensing signal V
SWith a max power constraint voltage V
LIMITIf, current sensing signal V
SGreater than max power constraint voltage V
LIMIT, the PWM controller 1 control signal V that will stop using
G' output, and then the restriction and the decision power supply unit peak power output.Simultaneously, PWM controller 1 further uses a PWM comparator 12 to come comparative voltage feedback signal V
FBWith current sensing signal V
S, and then the control signal V that periodically stops using
G' output, be able to the output voltage V of stabilized power supply device
O
See also Fig. 1 and Fig. 2, when power switch Q conducting, the energy ε that is stored on the transformer T inductance can be expressed as formula (1):
Flow through transformer T primary side switch current I
PCan be expressed as formula (2):
Peak power output P can be expressed as formula (3):
This I wherein
PWith L
PBe expressed as primary side switch current and the primary side inductance value of transformer T respectively; t
OnDuring for power switch Q conducting, control signal V
G' ON time; T
SBe control signal V
G' switching cycle.From top formula (2) as can be known, input voltage V
INSize can influence the primary side switch current I that the primary side of transformer T is set up
P, higher input voltage V
INPrimary side switch current I then
PIt is very fast to set up speed, otherwise then slower.Therefore, by this current sensing signal of comparison operation V
SWith this max power constraint voltage V
LIMIT, limited and determined the peak power output P of power supply unit.
Because above-mentioned formula (3) can be learnt the size of power supply unit power output P and the ON time t of power switch Q
OnWith input voltage V
INRelevant.And when considering safety (safety), the actual input voltage V of power supply unit
INScope to 264Vac, and often has the difference of several times by 90Vac between high and low input voltage.Yet, can automatically adjust ON time t by the feedback control loop of power supply unit
On, and make the power output P value of being maintained fixed.That is to say, as current sensing signal V
SBe higher than max power constraint voltage V
LIMITThe time, maximum ON time will be restricted this moment, and form limiting transformer T primary side switch current I
P
Cooperate Fig. 2, see also Fig. 3, it is the schematic diagram of propagation delay time waveform in the existing power supply supply.Existing Power Limitation is utilized max power constraint voltage V usually
LIMIT, for example the voltage quasi position of 1V comes and current sensing signal V
SMake comparisons, if current sensing signal V
SGreater than 1V, then this PWM controller 1 will stop to export control signal V
G' to this power switch Q, with the peak power output P of restriction with the decision power supply unit.
Yet, in fact as current sensing signal V
SBe higher than max power constraint voltage V
LIMITMoment, the control signal V of this PWM controller 1
G' can be through one section propagation delay time t
dAfter just can end.At this propagation delay time t
dWithin, power switch Q continues conducting, and will continue transmitted power.Therefore, the ON time of power switch Q reality equals 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
LIMITCan be than the Power Limitation voltage V under the low input
LIMITHeight 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 as shown in the formula shown in (4):
Compare aforesaid equation (3) and (4), because the propagation delay time t of PWM controller 1 inside
dWill make exciting curent many (V than theoretical value
IN/ L
P* t
d, therefore, bigger Power Limitation voltage V in the time of when high input voltage, will having with respect to low input
LIMITThough should propagation delay time t
dVery short, arrive 350ns between 200ns usually, and under the higher switching frequency, this propagation delay time t
dCan aggravate more the power output difference that high and low input voltage caused.
Summary of the invention
Technical problem underlying to be solved by this invention is to provide a kind of switching control device of output power back off, be used in the power supply unit, this switching control device can decide the slope value of a power limit signal by the resistance of adjusting an impedance unit, produced a reset signal by a comparison operation power limit signal and a current sensing signal again, this reset signal can be used to determine the ON time of a drive signal, as the compensation of power supply unit power output.
To achieve these goals, the invention provides a kind of switching control device of output power back off, be coupled to a magnetic device, control this control switch and switch this magnetic device, include by a power switch: one can output pulse signal oscillator; One wave generating unit is connected in this oscillator, receives this pulse signal, in order to export a power limit signal; One impedance unit is connected in this wave generating unit, in order to determine the slope value of this power limit signal; One comparing unit is connected in one and detects resistance, a pressure feedback port and this wave generating unit, receives a current sensing signal, a voltage feedback signal and this power limit signal, in order to export a reset signal; Reach an output unit and be connected in this comparing unit, this oscillator and this power switch, receive this reset signal and this pulse signal, in order to export a drive signal to this power switch.
The wave generating unit that the switching control device of output power back off of the present invention uses includes a ramp circuit that is connected in oscillator, ramp circuit according to the pulse signal that receives in order to export a ramp signal; One change-over circuit is connected in this ramp circuit and this impedance unit, by adjusting this impedance unit with the slope value that changes this ramp signal and then export one first electric current; And one the restriction current mirroring circuit be connected in this change-over circuit, according to this first electric current to export this power limit signal.
The present invention can be by adjusting the resistance of an impedance unit, and the power output difference that the offset supply supply is caused under high and low input voltage allows power supply unit work under the high and low different input supply voltage situation, can obtain identical power output.
Above general introduction and following detailed description are all exemplary in nature, are in order to further specify patent claim of the present invention.About other purpose of the present invention and advantage, will be set forth in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is existing power supply unit circuit diagram;
Fig. 2 is existing PWM controller internal circuit block schematic diagram;
Fig. 3 is the schematic diagram of propagation delay time waveform in the existing power supply supply;
Fig. 4 is used in the preferred circuit schematic diagram of power supply unit for the switching control device of output power back off of the present invention;
Fig. 5 is the switching control device preferred circuit block schematic diagram of output power back off of the present invention;
The wave generating unit circuit box schematic diagram that Fig. 6 uses for the present invention;
Fig. 7 is a wave generating unit circuit waveform schematic diagram of the present invention;
Fig. 8 is power limit signal V
SAWAt different impedance unit R
ThUnder the waveform schematic diagram; And
Fig. 9 is the waveform schematic diagram of the present invention when high and low voltage is imported.
Reference numeral:
12PWM comparator V
LIMITMax power constraint voltage
V
SCurrent sensing signal V
G' control signal
Q power switch T transformer
V
OOutput voltage R
SDetect resistance
The switching control device R of 2 output power back offs
ThImpedance unit
V
FBFeedback signal V
SAWPower limit signal
R
SDetect resistance
V
G Drive signal 20 wave generating unit
202 ramp circuit C capacitors
2020 coupler SW diverter switches
V
R1 Reference potential 2024 discharging current sources
204 change-over circuits, 2040 operational amplifiers
2042 conversioning transistors, 206 restriction current mirroring circuits
2,060 first constant current sources, 2,062 second constant current sources
Q1, Q2, Q3, Q4 transistor 22 oscillators
24 output units, 240 not circuits
242 flip-flops, 244 AND circuit
26 comparing units, 260 pulse-width modulators
262 power comparators, 264 logical circuits
Embodiment
See also Fig. 4, be used in the preferred circuit schematic diagram of power supply unit for the switching control device of output power back off of the present invention.The present invention utilizes the impedance adjustment to realize that the switching control device 2 of output power back off is according to adjusting an impedance unit R
ThResistance, a voltage feedback signal V
FBAnd detect resistance R from one
SOn the current sensing signal V that obtains
S, determined the drive signal V that exports
GON time, drive signal V
GPower controlling switch Q switching transformer T is in order to the purpose of the compensation that reaches the power supply unit power output.
Cooperate Fig. 4, see also Fig. 5, be the switching control device preferred circuit block schematic diagram of output power back off of the present invention.The switching control device 2 of output power back off is coupled to a magnetic device T by a power switch Q, switches this magnetic device T thereby control this power switch Q.The switching control device 2 of output power back off includes an oscillator 22, an exportable pulse signal PLS; One wave generating unit 20 is connected in this oscillator 22, to receive this pulse signal PLS, simultaneously in order to export a power limit signal V
SAWOne impedance unit R
ThBe connected in this wave generating unit 20, in order to determine this power limit signal V
SAWSlope value; One comparing unit 26 is connected in and detects resistance R
S, a pressure feedback port FB and this wave generating unit 20, to receive this current sensing signal V
S, a voltage feedback signal V
FBWith this power limit signal V
SAW, in order to export a reset signal Reset; And an output unit 24 is connected in this comparing unit 26, this oscillator 22 and this power switch Q, is used to receive this reset signal Reset and this pulse signal PLS, and synchronously this pulse signal PLS to export a drive signal V
GTo this power switch Q.This comparing unit 26 is connected to the output of power supply unit to obtain this voltage feedback signal V
FB, include: a power comparator 262 is connected in this wave generating unit 20 and detects resistance R with this
S, receive this current sensing signal V
SWith this power limit signal V
SAW, in order to export an overpower signal OC; One pulse-width modulator 260 is connected in this and detects resistance R
SWith the output of power supply unit, receive this current sensing signal V
SWith voltage feedback signal V
FB, in order to export a modulation signal PWM; Reach a logical circuit 264 and be connected to this power comparator 262, this pulse-width modulator 260 and this output unit 24, receive this overpower signal OC and this modulation signal PWM, in order to export this reset signal Reset to this output unit 24.
This output unit 24 includes: a flip-flop 242, one setting end S are connected in this oscillator 22, one replacement end R and are connected in this comparing unit 26, produce an output signal Q according to this pulse signal PLS and this reset signal Reset
SOne not circuit 240 is connected in this oscillator 22, and PLS is anti-phase with this pulse signal, in order to export a rp pulse signal/PLS; One AND circuit 244 is connected in the output of this not circuit 240 and the output of this flip-flop 242, receives this rp pulse signal/PLS and this output signal Q
S, in order to export this drive signal V
G
Still cooperate Fig. 4, consult Fig. 5, another embodiment of the present invention also can be connected in a feedback end and this power switch Q of this power supply unit by a control unit (not indicating), and control unit receives a current sensing signal V by this feedback end
SWith a voltage feedback signal V
FB, and export a drive signal V
GControl the output voltage of this power switch Q and this power supply unit.This current sensing signal V
sWhen being power switch Q conducting, this primary side switch current detects ohmically pressure drop one; And a wave generating unit 20, be connected in this control unit, transmit a power limit signal V
SAWTo this control unit, in order to control this drive signal VG and primary side switch current.One impedance unit R
ThBe connected in this wave generating unit 20, in order to determine this power limit signal V
SAWSlope value.
Control unit includes: a power comparator 262 is connected in this wave generating unit 20 and this feedback end, in order to receive this current sensing signal V
SWith this power limit signal V
SAW, and export an overpower signal 0C; One pulse-width modulator 260 is connected in this feedback end, to receive this current sensing signal V
SWith voltage feedback signal V
FB, in order to export a modulation signal PWM; One logical circuit 264 is connected to this power comparator 262, this pulse-width modulator 260, receives this overpower signal OC and this modulation signal PWM, in order to export this reset signal Reset; And a flip-flop 242, in order to received pulse signal PLS and this reset signal Reset, in order to export this drive signal V
GWherein this pulse signal PLS is used for this drive signal of conducting V
G, this reset signal Reset is used for by this drive signal V
GSee also Fig. 6, be the wave generating unit circuit box schematic diagram of the present invention's use.Include: a ramp circuit 202 is connected in this oscillator 22, according to this pulse signal PLS, in order to export a ramp signal RMP; One change-over circuit 204 is connected in this ramp circuit 202 and this impedance unit R
Th, by adjusting this impedance unit R
Th, changed the slope value of this ramp signal RMP, and exported one first electric current I
1One restriction current mirroring circuit 206 is connected in this change-over circuit 204, with according to this first electric current I
1, exported this power limit signal V
SAW
This ramp circuit 202 includes: a capacitor C; One coupler 2020 switches switch SW by one and is connected in this capacitor C, and coupler 2020 is with a reference potential V
R1Coupling output.This diverter switch SW is controlled by this pulse signal PLS, with reference potential V
R1C charges to capacitor, cooperates discharging current source 2024 again, goes up in this capacitor C and produces this ramp signal RMP.
This change-over circuit 204 connects a conversioning transistor 2042 by an operational amplifier 2040 and forms, and receives this ramp signal RMP, and in this impedance unit R
ThThis first electric current I of last generation
1This restriction current mirroring circuit 206 includes: first current mirror that is connected to form by transistor Q1, Q2, first current mirror is connected in this change-over circuit 204 and one first constant current source 2060, receives this first electric current I
1, and be subject to this first constant current source 2060 and one second electric current I of videoing out
2One second current mirror that is connected to form by transistor Q3, Q4 is connected in this first current mirror and one second constant current source 2062, with this second electric current I
2One the 3rd electric current I of videoing out
3An and output resistance R
0Be connected in this second current mirror and this second constant current source 2062, with according to the 3rd electric current I
3And be subject to this second constant current source 2062, obtained an output current I
0, and at output resistance R
0Last this power limit signal of generation V
SAW
Cooperate Fig. 5 and Fig. 6, see also Fig. 7, be wave generating unit circuit waveform schematic diagram of the present invention.The pulse signal PLS of oscillator 22 outputs is in time t
0-t
1The time be high levle, diverter switch SW conducting this moment, the ramp signal RMP that produces on capacitor C is reference potential V
R1Reference potential V
R1Obtain one first electric current I through change-over circuit 204
1, first electric current I
1Through first current mirror and second current mirror, produce second electric current I respectively again
2With the 3rd electric current I
3, first electric current I
1, second electric current I
2And the 3rd electric current I
3Waveform identical, electric current reflection is only arranged than last difference.Output current I
0According to second constant current source 2062 and with the 3rd electric current I
3Form complementary waveform, thus this moment output current I
0Be low level.
At time t
1-t
2, diverter switch SW ends, and the ramp signal RMP that produces on capacitor C begins to descend by discharging current source 2024.First electric current I that the ramp signal RMP that descends obtains descending through change-over circuit 204
1, first electric current I of decline
1Through first current mirror and second current mirror, producing respectively has second electric current I again
2With the 3rd electric current I
3, first electric current I
1, second electric current I
2And the 3rd electric current I
3Waveform identical, electric current reflection is only arranged than last difference.Output current I
0According to second constant current source 2062 and with the 3rd electric current I
3Form complementary waveform, thus this moment output current I
0It is a waveform that rises.At this moment, first electric current I
1, second electric current I
2And the 3rd electric current I
3The slope of falling waveform can be by impedance unit R
ThAdjust.
Time t
2-t
3, diverter switch SW is still for ending, and the ramp signal RMP that produces on capacitor C has dropped to low level.Ramp signal RMP obtains first electric current I of low level through change-over circuit 204
1, first electric current I
1Through first current mirror and second current mirror, producing respectively has second electric current I again
2With the 3rd electric current I
3, first electric current I
1, second electric current I
2And the 3rd electric current I
3Waveform identical, electric current reflection is only arranged than last difference.Output current I
0According to second constant current source 2062 and with the 3rd electric current I
3Form complementary waveform, thus this moment output current I
0Be high levle.
Consult Fig. 7 again, output current I
0Can be at output resistance R
0Last this power limit signal of generation V
SAW, power limit signal V
SAWWith output current I
0Waveform only be difference on the gain amplifier.See also Fig. 8, be power limit signal V
SAWAt different impedance unit R
ThUnder the waveform schematic diagram.
See also Fig. 9, be the waveform schematic diagram of the present invention when high and low voltage is imported.This power limit signal V of wave generating unit output
SAWPeriodic and this current sensing signal V
SComparison operation is in order to periodic adjustment drive signal V
GPulse duration, at power limit signal V
SAWAll has a compensation cycle T in each cycle
1, at this section compensation cycle T
1Time, power limit signal V
SAWSlope can be by impedance unit R
ThAdjust, be used as the compensation of power supply unit power under high and low input voltage.When power supply unit can feedback be obtained the higher current sensing signal V of slope down in high input voltage
S2, obtain the lower current sensing signal V of slope in the next feedback of low input
S1Power supply unit in high input voltage following the higher current sensing signal V of the slope that produces
S2Can the very fast power limit signal V that pushes up
SAWAnd by drive signal V
GOutput, to obtain the drive signal V of less pulse duration
G2And than low input following the lower current sensing signal V of the slope that produces
S1Can slowly push up power limit signal V
SAWAnd obtain the drive signal V of big pulse duration
G1
In fact, when high input voltage following the higher current sensing signal V of the slope that produces
S2Or low input following the lower current sensing signal V of the slope that produces
S1In compensation cycle T
1The time be higher than power limit signal V
SAWMoment, drive signal V
GCan be through one section propagation delay time t
dAfter just can end.At this propagation delay time t
dIn, power switch Q continues 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 sensing signal V of slope
S2In compensation cycle T
1Shi Xianding is to power limit signal V
SAW, and drive signal V
G2Can be through one section propagation delay time t
dAfter just can end and the lower current sensing signal V of slope
S1In compensation cycle T
1The time slow power limit signal V that pushes up
SAW, and drive signal V
G1Can magnify relatively, and through one section propagation delay time t
dAfter just can end.
Power limit signal V
SAWIn compensation cycle T
1The power output of Shi Zuowei restriction power supply unit under high and low input voltage can allow the higher current sensing signal V of slope
S2Or the lower current sensing signal V of slope
S1At the actual propagation delay time t that considers
dThe time, have identical actual power limit point V
a, 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.
In sum, the present invention is used in the power supply unit, resistance by adjusting an impedance unit is to determine the slope value of an inner power limit signal, and a periodic comparison operation power limit signal and a current sensing signal are determined the turn-on cycle of a drive signal, as the compensation of power supply unit power output.
The above only is the detailed description and the accompanying drawing of preferred embodiment of the present invention, but feature of the present invention is not limited thereto, and is not in order to restriction the present invention.Scope of the present invention should be as the criterion with following claims, the all spirit of the present patent application claim and embodiment of similar variation thereof of catering to, all should be contained in the category of the present invention, any those of ordinary skill in the art is in the field of the invention, and variation of being made or modification all can be encompassed among the scope of this case.
Claims (12)
1, a kind of switching control device of output power back off is installed in the power supply unit, is coupled to a magnetic device by a power switch, controls this power switch and switches this magnetic device, to produce a primary side switch current, it is characterized in that, includes:
One oscillator is exported a pulse signal;
One wave generating unit is connected in this oscillator, receives this pulse signal, in order to export a power limit signal;
One impedance unit is connected in this wave generating unit, in order to determine the slope value of this power limit signal;
One comparing unit, be connected in one in this power supply unit and detect resistance, a pressure feedback port and this wave generating unit, receive a current sensing signal, a voltage feedback signal and this power limit signal respectively, in order to export a reset signal, when this current sensing signal was this power switch conducting, this primary side switch current detected ohmically pressure drop at this; And
One output unit is connected in this comparing unit, this oscillator and this power switch, receives this reset signal and this pulse signal, in order to export a drive signal to this power switch.
2, the switching control device of a kind of output power back off as claimed in claim 1 is characterized in that, this comparing unit includes:
One power comparator is connected in this wave generating unit and this detects resistance, receives this power limit signal and this current sensing signal, in order to export an overpower signal;
One pulse-width modulator is connected in this and detects resistance and this pressure feedback port, receives this current sensing signal and this voltage feedback signal, in order to export a modulation signal; And
One logical circuit is connected to this power comparator, this pulse-width modulator and this output unit, receives this overpower signal and this modulation signal, in order to export this reset signal to this output unit.
3, the switching control device of a kind of output power back off as claimed in claim 1 is characterized in that, this output unit includes:
One flip-flop, one is set end and is connected in this oscillator, and a replacement end is connected in this comparing unit, receives this pulse signal and this reset signal, in order to produce an output signal;
One not circuit is connected in this oscillator, and this pulse signal is anti-phase, in order to export a rp pulse signal; And
One AND circuit is connected in the output of this not circuit and the output of this flip-flop, receives this rp pulse signal and this output signal, in order to export this drive signal.
4, the switching control device of a kind of output power back off as claimed in claim 1 is characterized in that, this wave generating unit includes:
One ramp circuit is connected in this oscillator, receives this pulse signal, in order to export a ramp signal;
One change-over circuit is connected in this ramp circuit and this impedance unit, by adjusting this impedance unit, is changed the slope value of this ramp signal, and exports one first electric current; And
One restriction current mirroring circuit is connected in this change-over circuit, according to this first electric current, is exported this power limit signal.
5, the switching control device of a kind of output power back off as claimed in claim 4 is characterized in that, this ramp circuit includes:
One capacitor;
One coupler switches switch by one and is connected in this capacitor, with reference potential coupling output; And
One discharging current source is connected in this capacitor;
Wherein, this diverter switch is controlled by this pulse signal, and produces this ramp signal on this capacitor.
6, the switching control device of a kind of output power back off as claimed in claim 4 is characterized in that, this restriction current mirroring circuit includes:
One first current mirror is connected in this change-over circuit and one first constant current source, and receive this first electric current, and be subject to this first constant current source, and one second electric current of videoing out;
One second current mirror is connected in this first current mirror and one second constant current source, with this second electric current one the 3rd electric current of videoing out; And
One output resistance is connected in this second current mirror and this second constant current source, according to the 3rd electric current and be subject to this second constant current source, is obtained an output current, produces this power limit signal.
7, a kind of switching control device of output power back off is installed in the power supply unit, is coupled to a magnetic device by a power switch, controls this power switch and switches this magnetic device, to produce a primary side switch current, it is characterized in that, includes:
One control unit, be connected in a feedback end and this power switch in this power supply unit, receive a current sensing signal and a voltage feedback signal by this feedback end, control the output voltage of this power switch and this power supply unit in order to export a drive signal, when this current sensing signal was this power switch conducting, this primary side switch current detected ohmically pressure drop one;
One wave generating unit is connected in this control unit, transmits a power limit signal to this control unit, in order to control this drive signal and to limit this primary side switch current; And
One impedance unit is connected in this wave generating unit, in order to determine the slope value of this power limit signal.
8, the switching control device of a kind of output power back off as claimed in claim 7 is characterized in that, this power limit signal and this drive signal are synchronous.
9, the switching control device of a kind of output power back off as claimed in claim 7 is characterized in that, this control unit includes:
One power comparator is connected in this wave generating unit and this feedback end, receives this power limit signal and this current sensing signal, in order to export an overpower signal;
One pulse-width modulator is connected in this feedback end, receives this current sensing signal and this voltage feedback signal, in order to export a modulation signal;
One logical circuit is connected to this power comparator and this pulse-width modulator, receives this overpower signal and this modulation signal, in order to export a reset signal; And
One flip-flop receives a pulse signal and this reset signal, in order to export this drive signal;
Wherein this pulse signal is used for this drive signal of conducting, and this reset signal is used for by this drive signal.
10, the switching control device of a kind of output power back off as claimed in claim 7 is characterized in that, this wave generating unit includes:
One ramp circuit receives this pulse signal, in order to export a ramp signal;
One change-over circuit is connected in this ramp circuit and this impedance unit, by adjusting this impedance unit, is changed the slope value of this ramp signal, and exports one first electric current; And
One restriction current mirroring circuit is connected in this change-over circuit, according to this first electric current, is exported this power limit signal.
11, the switching control device of a kind of output power back off as claimed in claim 10 is characterized in that, this ramp circuit includes:
One capacitor;
One coupler switches switch by one and is connected in this capacitor, with reference potential coupling output; And
One discharging current source is connected in this capacitor;
Wherein, this diverter switch is controlled by this pulse signal, and produces this ramp signal on this capacitor.
12, the switching control device of a kind of output power back off as claimed in claim 10 is characterized in that, this restriction current mirroring circuit includes:
One first current mirror is connected in this change-over circuit and one first constant current source, and receive this first electric current, and be subject to this first constant current source, and one second electric current of videoing out;
One second current mirror is connected in this first current mirror and one second constant current source, with this second electric current one the 3rd electric current of videoing out; And
One output resistance is connected in this second current mirror and this second constant current source, according to the 3rd electric current and be subject to this second constant current source, is obtained an output current, produces this power limit signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101156554A CN100514814C (en) | 2005-11-09 | 2005-11-09 | A switch-over type control device for output power compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101156554A CN100514814C (en) | 2005-11-09 | 2005-11-09 | A switch-over type control device for output power compensation |
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| Publication Number | Publication Date |
|---|---|
| CN1964172A true CN1964172A (en) | 2007-05-16 |
| CN100514814C CN100514814C (en) | 2009-07-15 |
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| CNB2005101156554A Expired - Fee Related CN100514814C (en) | 2005-11-09 | 2005-11-09 | A switch-over type control device for output power compensation |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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2005
- 2005-11-09 CN CNB2005101156554A patent/CN100514814C/en not_active Expired - Fee Related
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