CN103427648B - Power-supply controller of electric and control method - Google Patents
Power-supply controller of electric and control method Download PDFInfo
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- CN103427648B CN103427648B CN201210162298.7A CN201210162298A CN103427648B CN 103427648 B CN103427648 B CN 103427648B CN 201210162298 A CN201210162298 A CN 201210162298A CN 103427648 B CN103427648 B CN 103427648B
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Abstract
The invention discloses a kind of power-supply controller of electric and control method.This power-supply controller of electric includes a pulse generator, a sampler, a comparator and a switch controller.This pulse generator provides an enable signal, defines the enable time.This comparator has two inputs, must be coupled to a feedback signal and a reference signal, and an output, is coupled to a compensating electric capacity.This comparator obtains by this enable signal enable, with to this compensating electric capacity discharge and recharge.This switch controller, according to an offset voltage of this compensating electric capacity, controls a power switch.The voltage of this feedback signal can be generally corresponding to an output voltage of this power supply unit.Therefore, the output supply voltage of the present invention can compare correctly, and can save hardware material cost compared to prior art.
Description
Technical field
The present invention is to be relevant to a kind of power-supply controller of electric and control method, especially a kind of switch saving system cost
Formula power supply unit and its control method.
Background technology
Power supply unit is a kind of electronic installation essential to most electronic product, for by battery or civil power, changing
Required by electronic product is become to ask and have the power supply of specific standard.In numerous power supply units, switch type power supplying utensil
There are superior energy conversion efficiency and compact small product size, so extensively being welcome by power supply industry.
At present in switch type power supplying device, there are two kinds of different control modes：Primary side controls (primary side
Control, PSC) and secondary side control (secondary side control, SSC).SSC is directly in a power supply unit
The outfan that exported of a secondary side winding couple circuit for detecting, then pass through photo-coupler (photo coupler),
Detecting result is sent to the power-supply controller of electric positioned at primary side, uses this power supply unit of control and will store up in first side winding
The energy deposited and change.With respect to SSC, PSC is the induced voltage by direct detecting in an assists winding, indirectly to detect
Survey the voltage that secondary side winding is exported, also indirectly complete the output voltage of an outfan of detecting power supply unit.PSC
Detecting and conversion energy control, all complete in primary side.Compared to SSC, PSC may be more cost-effective, because not
Need volume and all larger photo-coupler of expense；PSC conversion efficiency may be higher, because consumption can not fixed in secondary side
The circuit for detecting of energy.
Fig. 1 is a kind of switch type power supplying device of prior art, using PSC.Bridge rectifier (bridge
Rectifier) alternating current (alternative current) of 20 civil powers is converted into the input power V of direct currentIN.Input
Power supply VINVoltage be likely to be of M shape waveform it is also possible to be filtered into substantially time-independent certain value.Power-supply controller of electric
26 pass through drive end GATE, periodically control power switch 34.When power switch 34 is opened, first side winding PRM is stored up
Energy.When power switch 34 is closed, secondary side winding SEC and assists winding AUX release energy, to set up out-put supply VOUTTo negative
Carry 24 and operation power VCCTo power-supply controller of electric 26.
Divider resistance 28 and 30 detects the voltage V of assists winding AUXAUX, feedback signal V is providedFBTo power-supply controller of electric 26
Feedback end FB.According to feedback signal VFB, power-supply controller of electric 26 sets up offset voltage V in compensating electric capacity 32COM, and control according to this
Power switch 34.
Fig. 2 shows power-supply controller of electric 26 and some external modules in Fig. 1.Power-supply controller of electric 26 include sampler 12,
Pulse generator 14, comparator 15 and pulse bandwidth controller 16.Fig. 3 shows some signal timing diagrams in Fig. 1 and Fig. 2,
From top to down, including the drive signal V in drive end GATEGATE, the feedback signal V in feedback end FBFB, pulse generator 14
It is supplied to the sampling frequency signal V of sampler 12SH, sampled signal V produced by sampler 12IFB, and comparator 15 in compensation
Offset voltage V set up on electric capacity 32COM.
Content of the invention
The embodiment of the present invention provides a kind of control method it is adaptable to a power supply unit, and this power supply unit includes a work(
Rate switchs.After this control method is included in the closing of this power switch, provide the enable time；According to a feedback signal and a ginseng
Examine signal, within this enable time, to a compensating electric capacity discharge and recharge；And, according to an offset voltage of this compensating electric capacity, control
This power switch.The voltage of this feedback signal can be generally corresponding to an output voltage of this power supply unit.
The embodiment of the present invention provides a kind of power-supply controller of electric.This power-supply controller of electric include a pulse generator, a sampler,
One comparator and a switch controller.This pulse generator provides an enable signal, defines the enable time.This comparator
There are two inputs, a feedback signal and a reference signal must be coupled to, and an output, it is coupled to a compensating electric capacity.This ratio
Obtain by this enable signal enable compared with device, with to this compensating electric capacity discharge and recharge.This switch controller is according to a benefit of this compensating electric capacity
Repay voltage, control a power switch.The voltage of this feedback signal can be generally corresponding to an output voltage of this power supply unit.
Brief description
Fig. 1 is that a kind of prior art adopts the switch type power supplying device that primary side controls.
Fig. 2 shows power-supply controller of electric and some external modules in Fig. 1.
Fig. 3 shows some signal timing diagrams in Fig. 1 and Fig. 2.
Fig. 4 shows the power supply unit according to institute of the present invention embodiment.
Fig. 5 shows power-supply controller of electric and some external modules in Fig. 4.
Fig. 6 shows some signal timing diagrams in Fig. 4 and Fig. 5.
A power-supply controller of electric and some external modules that Fig. 7 display foundation present invention is implemented.
Fig. 8 shows some signal timing diagrams in Fig. 7.
Wherein, description of reference numerals is as follows：
12 samplers
14th, 62,62a pulse generator
15th, 64 comparator
16 pulse bandwidth controllers
19 power supply units
20 bridge rectifiers
24 loads
26th, 60,60a power-supply controller of electric
28th, 30 divider resistance
32nd, 66 compensating electric capacity
34 power switch
AUX assists winding
FB feedback end
GATE drive end
PRM first side winding
SEC secondary side winding
TDISDischarge time
TENThe enable time
TSHSample time
TSTRWaiting time
VCOMOffset voltage
VENEnable signal
VFBFeedback signal
VGATEDrive signal
VIFBSampled signal
VREFReference signal
VSHSampling frequency signal
Specific embodiment
As shown in Figure 3, sampler 12 is to feedback signal VFBSampled signal V produced by samplingIFB, it is intended to represent and putting
Electric time T-DISIn certain special time feedback signal VFB, it can be mapped to the out-put supply V in secondary sideOUT.So sampling letter
Number VIFBThe result maintaining after sampling should be kept by holding.However it is possible to the reason electric leakage, sampled signal VIFBCan gradually go up
Rise or decline.As shown in Figure 3, in addition to the time that sampling occurs, sampled signal VIFBIt is to reduce in time.Cause
This, sampled signal VIFBIn most times, possibly cannot accurately represent the feedback signal V of that special timeFB, and comparator
15 according to wrong sampled signal VIFB, come to compensating electric capacity 32 discharge and recharge, it is possible that establishing offset voltage V of mistakeCOM,
As shown in Figure 3.As a result, out-put supply V may be result inOUTWrong output voltage.
Fig. 4 shows the power supply unit 19 according to institute of the present invention embodiment.Power-supply controller of electric in power supply unit 19
60 can be constituted with the integrated circuit (monolithic integrated circuit) of a monocrystalline.Compared to existing in Fig. 1
Technology, power supply unit 19 does not have external compensating electric capacity 32, so from the point of view of system cost, may can save hardware material
(bill of material, BOM) cost.The reason power supply unit 19 can not have external compensating electric capacity 32 will be in after a while
Explain.
The power supply unit implemented according to the present invention at another, can have external compensating electric capacity 32 as Fig. 1.
Fig. 5 shows power-supply controller of electric 60 and some external modules in Fig. 4.Power-supply controller of electric 60 include sampler 12,
Pulse generator 62, comparator 64 and pulse bandwidth controller 16.
Pulse generator 62, provides sampling frequency signal VSHAnd enable signal VEN, give sampler 12 respectively and compare
Device 64.
Sampling frequency signal VSHDefine sampler 12 to feedback signal VFBT sample time of execution samplingSH.Work as sampling
Frequency signal VSHDuring for enable (asserted), sampled signal VIFBEqual to feedback signal VFB.As sampling frequency signal VSHFor going
During energy (deasserted), sampled signal VIFBShould be observed by holding, and isolate from feedback signal VFB.
Enable signal VEN defines the enable time T that comparator 64 can drive compensating electric capacity 66EN.In one embodiment,
Comparator 64 is a transducer (transconductor), has two inputs to be respectively coupled to sampled signal VIFBWith reference signal
VREF, and an output is couple to compensating electric capacity 66.As enable signal VENFor, during enable, comparator 64 is according to sampled signal VIFB
With reference signal VREFDifference, discharge and recharge is carried out to compensating electric capacity 66.As enable signal VENDuring for deenergizing, the output of comparator 64
For high impedance (high impedance), compensating electric capacity 66 is held and is observed its offset voltage VCOM.
Pulse bandwidth controller 16 is according to offset voltage VCOM, to drive drive end GATE.In one embodiment, according to benefit
Repay voltage VCOM, pulse bandwidth controller 16 controls the ON time T of power switch 34ON.In another embodiment, compensate electricity
Pressure VCOMDetermine the switching frequency of power switch 34.
Fig. 6 shows some signal timing diagrams in Fig. 4 and Fig. 5, from top to down, is drive signal V respectivelyGATE, feedback letter
Number VFB, sampling frequency signal VSH, sampled signal VIFB, enable signal VEN, and offset voltage VCOM.In opening time TONInterior, drive
Dynamic signal VGATEFor enable, feedback signal VFBThe negative voltage being sensed then has been reacted on assists winding AUX.
As drive signal VGATEAfter being to deenergize from enable transition, enter shut-in time TOFF.Shut-in time TOFFOne open
During the beginning, it is discharge time TDIS.As in discharge time TDISIn, feedback signal VFBRise to a high point at the beginning, it is about anti-
Answer the output voltage of secondary side.About in discharge time TDISAt the end of, because secondary side winding SEC discharge off, return
Feedback signal VFBTenesmus, hands over and crosses 0 volt.Discharge time T-DIS, it is defined as secondary side winding SEC in one embodiment to output
The time of end OUT continuous discharge, it is defined as feedback signal V in another embodimentFBTime in higher than about 0 voltage.
In one embodiment, pulse generator 62 is according to the discharge time T in previous switch periodsDIS, when deciding to wait for
Between TSTR, it is equal to determine T sample timeSHStarting point.For example, waiting time TSTRFor during electric discharge in previous switch periods
Between TDIS2/3.In another embodiment, waiting time TSTRIt can be a constant fixed value.
Sample time TSHBefore, sampled signal VIFBProbably due to leaking electricity and gradually declining, as shown in Figure 6.But,
Sample time TSHWhen, sampled signal VIFBTo be updated, and the reaction of loyalty feedback signal V at that timeFB, it has reacted output electricity
Source VOUTVoltage.In T sample timeSHAfterwards, sampled signal VIFBStill successively decrease in time.It can thus be stated that in sampling
Between TSHAnd in a little of short duration time afterwards, sampled signal VIFBIt may be said that can be said to be loyal reaction out-put supply V at that timeOUT
Voltage.
In figure 6, enable signal VENWith sampling frequency signal VSH- be at about enabled, enable time TENTime long
Degree is longer than T sample time then a littlelySHTime span.As shown in Figure 6, in enable time TENIn, because sampled signal
VIFBHigher than reference signal VREF, so compensating electric capacity 66 is discharged and declined by comparator 64.Such discharge process, with enable
Time TENPast and be terminated, so compensating electric capacity 66 is held and observed offset voltage VCOM.Now, even if sampled signal VIFBBecause leakage
Electricity has changed into mistake, does not also interfere with offset voltage VCOM.As described above, because in enable time TENIn, sampling letter
Number VIFBCan be said to be loyal reaction out-put supply V at that timeOUTVoltage, so offset voltage VCOMCan be more correct.Set up
Out-put supply VOUTVoltage also can compare correctly.
Because enable time TENCan be very short, so the capacitance of compensating electric capacity 66 does not need very greatly it is possible to reach whole
The frequency compensation of individual control loop.Therefore, in one embodiment, compensating electric capacity 66 is with the electric capacity institute structure in integrated circuit
Become, power-supply controller of electric 60 is not provided with a pin and carrys out external one external compensating electric capacity.Simply, in another embodiment, power supply
Controller 60 can also arrange a pin and carry out external one external compensating electric capacity, to increase compensating electric capacity value.
In one embodiment, sampling frequency signal VSHWith enable signal VENFor same signal, so T sample timeSHDeng
In enable time TEN.
In another embodiment, enable time TENIn T sample timeSHWithin, but it is shorter than T sample timeSH.
Power-supply controller of electric 26 compared to Fig. 2, at least has the advantage that according to the power-supply controller of electric 60 that the present invention is implemented：
Firstth, out-put supply VOUTVoltage may compare correctly：Because offset voltage VCOMOnly can by about correct when sampling believe
Number VIFBAffected.Secondth, hardware material (bill of material, BOM) cost may be relatively cheap：Because can omit
External compensating electric capacity.
Power-supply controller of electric 60a and some external modules that Fig. 7 display foundation present invention is implemented, wherein, power supply
Device 60a can replace the power-supply controller of electric 60 in Fig. 4 or Fig. 5.Fig. 8 shows some signal timing diagrams in Fig. 7.
Different from the power-supply controller of electric 60 of Fig. 5, power-supply controller of electric 60a does not have sampler 12.Therefore, compared to Fig. 5, electricity
Pulse generator 62a in the controller 60a of source only has generation enable signal VEN, to control comparator 64 to compensating electric capacity 66 charge and discharge
The time of electricity.Two inputs of comparator 64 are directly coupled to feedback signal VFBAnd reference signal VREF.
As shown in Figure 8, enable signal VENDefined enable time TENIn discharge time TDISWithin, and be shorter than and put
Electric time TDIS.So, in enable time TENInterior, feedback signal VFBReaction that just can be loyal out-put supply V at that timeOUT's
Voltage, so what now the comparative result of comparator 64 can be loyal knows that power supply unit should increase or reduce its output
Power, offset voltage V being adjusted outCOMCan be more correct.Also therefore, the out-put supply V being set upOUTVoltage also can compare
Correctly.
Similar with the power-supply controller of electric 60 of Fig. 5, the power-supply controller of electric 60a of Fig. 7 also has out-put supply VOUTVoltage may compare
Relatively correct and hardware material cost may comparatively cheap two benefits.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (13)
1. it is adaptable to a power supply unit, this power supply unit includes a power switch to a kind of control method, this control method
Be characterised by including：
After this power switch is closed, provide the enable time, a starting point of wherein this enable time is according to previous switch week
An interim discharge time and produce；
According to a feedback signal and a reference signal, within this enable time, to a compensating electric capacity discharge and recharge；
According to an offset voltage of this compensating electric capacity, control this power switch；And
Outside this enable time, not to this compensating electric capacity discharge and recharge, so that this compensating electric capacity is maintained this offset voltage；
Wherein, the voltage of this feedback signal to should power supply unit an output voltage.
2. control method as claimed in claim 1 is it is characterised in that also include：
After this power switch is closed, provide a sample time；
Within this sample time, to this feedback signal, it is sampled, to produce a sampled signal；And
According to this sampled signal and this reference signal, within this enable time, to this compensating electric capacity discharge and recharge.
3. control method as claimed in claim 2 is it is characterised in that start simultaneously at this enable time and this sample time.
4. control method as claimed in claim 2 is not it is characterised in that when the time span of this enable time is shorter than this sampling
Between time span.
5. control method as claimed in claim 1, it is characterised in that controlling this step of this power switch, is to control this work(
The ON time of rate switch.
6. control method as claimed in claim 1 is it is characterised in that within this enable time, the voltage pair of this feedback signal
Should power supply unit an output voltage.
7. control method as claimed in claim 1 is it is characterised in that switch periods of this power supply unit have an electric discharge
Time, and this enable time be shorter than this discharge time.
8. a kind of power-supply controller of electric is it is adaptable to a power supply unit, this power-supply controller of electric be characterised by including：
One pulse generator, in order to provide an enable signal, defines the enable time, the starting point of wherein this enable time be according to
Produce according to the discharge time in previous switch periods；
One comparator, has two inputs, must be coupled to a feedback signal and a reference signal, and an output, is coupled to one
Compensating electric capacity, wherein, this comparator obtains by this enable signal enable, with to this compensating electric capacity discharge and recharge；And
One switch controller, according to an offset voltage of this compensating electric capacity, controls a power switch；
Wherein, the voltage of this feedback signal to should power supply unit an output voltage, this enable time betides this power
After switch cuts out, and when this comparator is deenergized by this enable signal, this comparator not to this compensating electric capacity discharge and recharge, with
This compensating electric capacity is made to be maintained this offset voltage.
9. power-supply controller of electric as claimed in claim 8 it is characterised in that this pulse generator provide a sampling frequency signal,
Define a sample time, this power-supply controller of electric separately includes：
One sampler, according to this sampling frequency signal, in order to sample to this feedback signal, to produce a sampled signal；
Wherein, one of them of two inputs of this comparator, is coupled to this sampled signal.
10. power-supply controller of electric as claimed in claim 9 is it is characterised in that be associated with this enable time this sample time.
11. power-supply controller of electric as claimed in claim 9 are it is characterised in that start simultaneously at this enable time and this sample time.
12. power-supply controller of electric as claimed in claim 8 are it is characterised in that this switch controller controls leading of this power switch
The logical time.
13. power-supply controller of electric as claimed in claim 8 it is characterised in that this enable time be shorter than in switch periods one
Discharge time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210162298.7A CN103427648B (en) | 2012-05-23 | 2012-05-23 | Power-supply controller of electric and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210162298.7A CN103427648B (en) | 2012-05-23 | 2012-05-23 | Power-supply controller of electric and control method |
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| Publication Number | Publication Date |
|---|---|
| CN103427648A CN103427648A (en) | 2013-12-04 |
| CN103427648B true CN103427648B (en) | 2017-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210162298.7A Active CN103427648B (en) | 2012-05-23 | 2012-05-23 | Power-supply controller of electric and control method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6977824B1 (en) * | 2004-08-09 | 2005-12-20 | System General Corp. | Control circuit for controlling output current at the primary side of a power converter |
| CN101064474A (en) * | 2006-11-29 | 2007-10-31 | 崇贸科技股份有限公司 | Control circuit of power supply switch |
| CN101924471A (en) * | 2010-08-31 | 2010-12-22 | 深圳市明微电子股份有限公司 | Method for constantly outputting current and device thereof |
| CN101243602B (en) * | 2005-10-09 | 2011-01-12 | 崇贸科技股份有限公司 | Close-loop PWM controller for primary-side controlled power converters |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7492613B2 (en) * | 2005-11-28 | 2009-02-17 | System General Corp. | Control circuit of power converter having adaptive bias for detecting reflected voltage of transformer |
-
2012
- 2012-05-23 CN CN201210162298.7A patent/CN103427648B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6977824B1 (en) * | 2004-08-09 | 2005-12-20 | System General Corp. | Control circuit for controlling output current at the primary side of a power converter |
| CN101243602B (en) * | 2005-10-09 | 2011-01-12 | 崇贸科技股份有限公司 | Close-loop PWM controller for primary-side controlled power converters |
| CN101064474A (en) * | 2006-11-29 | 2007-10-31 | 崇贸科技股份有限公司 | Control circuit of power supply switch |
| CN101924471A (en) * | 2010-08-31 | 2010-12-22 | 深圳市明微电子股份有限公司 | Method for constantly outputting current and device thereof |
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| CN103427648A (en) | 2013-12-04 |
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