CN104734506A - Power supply controller capable of providing load compensation and related control method - Google Patents
Power supply controller capable of providing load compensation and related control method Download PDFInfo
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- CN104734506A CN104734506A CN201310698183.4A CN201310698183A CN104734506A CN 104734506 A CN104734506 A CN 104734506A CN 201310698183 A CN201310698183 A CN 201310698183A CN 104734506 A CN104734506 A CN 104734506A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a power supply controller capable of providing load compensation and a related control method. The embodiment of the invention discloses a power supply controller which can be applied to a switched-mode power supply. The switched-mode power supply comprises an inductive element and a power switch in serial connection. The power supply controller comprises an output current estimator and a current limiter, wherein the output current estimator is constructed for providing a current detection signal and a discharge time signal; the current detection signal represents an inductive current flowing through the inductive element; and the discharge time signal indicates a discharge time of the inductive element. On the basis of the current detection signal and the discharge time signal, the output current estimator generates a charge current which approximately corresponds to an output current outputted by the switched-mode power supply to a load. The charge current is limited to be no more than a maximal value. When the charge current is equal to the maximal value, the current limiter is constructed for limiting the current detection signal.
Description
Technical field
The present invention relates to switch type power supplying device (switched mode power supply), particularly relate to the power supply unit can estimating the output current exporting a load to.
Background technology
Switch type power supplying device generally adopts a power switch to carry out the electric current of control flow check through an inductance element.With other general power supply units in comparison, switch type power supplying utensil has less small product size and more superior conversion efficiency, so extensively by welcome and the employing of industry.
The supply of flyback (flyback) framework, because which provide the isolated effect of electricity, so be used widely.Flyback framework is with a transformer, and the input power cord being connected to commercial power socket, direct current isolates from the out-put supply line being connected to load.Primary side generally refers to that side at those circuit places being electrically connected to input power cord; Relative, primary side generally refers to that side at those circuit places being electrically connected to out-put supply line.So-called primary side controls to be adopt resistance or some electronic components, is placed on primary side, detects the output voltage in the load of primary side or the output current flow through.Primary side controls simply to reach good output voltage or output current adjustment (regulation), but because primary side resistance or electronic component constantly consumes electric energy, therefore primary side control may have lower conversion efficiency.U.S. Patent Application Publication No. US20100321956A1 discloses many switch type power supplying devices, and it adopts primary side to control to regulate maximum rated output current or the rated output voltage of primary side.U.S. Patent Application Publication No. US20100321956A1 can make the maximum rated output current of primary side, is approximately a definite value do not changed with the input voltage of input power cord.
Load compensation (load compensation) is a kind of when increasing the output current of load, and just a kind of technology of increase output voltage, can be used for compensating the loss of voltage between power supply unit and load on transmission line.Accomplish a conventional method for load compensation, be adopt the peak current flowing through a transformer, be approximately used as the representative of the output current exporting a load to, change the desired value of the output voltage that power supply unit regulates according to this.But known to industry, peak current has sizable difference, so peak current can not be used for representing output current at all with output current.
Summary of the invention
Embodiment discloses a kind of power-supply controller of electric, is applicable to a switch type power supplying device.This switch type power supplying device includes the inductance element and a power switch that are cascaded.This power-supply controller of electric includes an output current estimator and a demand limiter.This output current estimator, framework provides a current detection signal and a discharge time signal.The representative of this current detection signal flows through an inductive current of this inductance element.This discharge time signal indicates a discharge time of this inductance element.And according to this current detection signal and this discharge time signal, this output current estimator produces a charging current, make it approximately to should the output current that exports a load of switch type power supplying device.This charging current is limited to be not more than a maximum.When this charging current equals this maximum, this demand limiter framework is in order to limit this current detection signal.
Embodiment discloses a kind of control method, is applicable in a switch type power supplying device, as output electric current measure.This switch type power supplying device includes an inductance element and a power switch, is serially connected.This control method includes: receive a current detection signal, and it roughly represents the inductive current flowing through this inductance element; Detect this inductance element, to produce a discharge time signal, roughly indicate a discharge time of this inductance element; According to this current detection signal and this discharge time signal, produce a charging current, wherein, this discharging current approximately represents the output current that this switch type power supplying device exports a load to; Restriction makes this charging current be no more than a maximum; And, when this charging current equals this maximum, suppress this current detection signal.
Embodiment has separately disclosed a kind of power-supply controller of electric, is applicable to a switch type power supplying device.This switch type power supplying device includes the inductance element and a power switch that are cascaded.This power-supply controller of electric includes an output current estimator and a load compensator.This output current estimator framework receives a current detection signal and a discharge time signal.This current detection signal roughly represents the inductive current flowing through this inductance element, and this discharge time signal approximately indicates a discharge time of this inductance element.This output current estimator, according to this current detection signal and this discharge time signal, produces a charging current.This charging current is roughly to should the output current that exports a load of switch type power supplying device.This load compensator, according to this charging current, framework draws a bias current from a resistance, flows to an earth connection.This inductance element includes an auxiliary winding, and this resistance is connected between this auxiliary winding and this load compensator.
Accompanying drawing explanation
Fig. 1 shows the switch type power supplying device implemented according to the present invention.
Fig. 2 shows the waveform of some signals in Fig. 1.
Power-supply controller of electric in Fig. 3 exemplary graph 1.
Output current estimator in Fig. 4 exemplary graph 3.
Fig. 5 A shows in certain embodiments, charging current I
cHARGEwith voltage V
mrelation.
Fig. 5 B shows in certain embodiments, bias current I
oFFSETwith charging current I
cHARGErelation.
[symbol description]
Embodiment
One embodiment of the invention have the power-supply controller of electric being arranged at primary side, and it can according to the electric current of primary side winding flowing through a transformer, and a discharge time of this transformer, produces estimated signal.One of them of these estimated signal is a charging current, and its method produced will be explained in this description, and proves the output current that this charging current considerably can represent a power supply unit and exports a load.And by limiting the maximum of this charging current, this output current also can by the maximum rated output current being no more than this power supply unit regulated exactly.In addition, this charging current can represent this output current very accurately or considerably, so this charging current as an input, can produce and as a bias current of load compensation (offset current), and will obtain a result precisely controlled.
Fig. 1 shows the switch type power supplying device 10 implemented according to the present invention, and it adopts primary side to control.Bridge rectifier 20 provides full wave type rectification, by alternating current (AC) power supply that commercial power socket supply comes, converts direct current (DC) input power V to
iN.Input power V
iNvoltage, the waveform of M type may be had, or be roughly a fixed constant.Power-supply controller of electric 26 can be an integrated circuit, and it has several pin, can be electrically connected to peripheral device or element.By drive end GATE, power switch 34 can be opened or be closed to power-supply controller of electric 26 periodically.When power switch 34 is opened, the primary side winding PRM energy storage of this transformer; When power switch 34 is closed, this transformer releases energy by primary side winding SEC and auxiliary winding AUX, sets up out out-put supply V respectively
oUTand operating power V
cC, be supplied to load 24 and power-supply controller of electric 26 respectively.Be connected between load 24 and secondary winding and have transmission line 38, its dead resistance represents with the resistance be shown in wherein.
Resistance 28 and 30 can be considered as a voltage divider, is used for detecting the cross-pressure V on auxiliary winding AUX
aUX, then a feedback voltage signal V is provided
fB, to a feedback end FB of power-supply controller of electric 26.When power switch 34 is closed, cross-pressure V
aUXlarge appointment is that one of the cross-pressure of ratio on primary side winding SEC maps voltage (reflective voltage).According to feedback voltage signal V
fB, power-supply controller of electric 26 controls the work period (duty cycle) of power switch 34.By current detecting end CS, power-supply controller of electric 26 detects current detection voltage V
cS, which represent the electric current I flowing through current sense resistor 36, power switch 34 and primary side winding PRM
pRM.
Fig. 2 shows the waveform of some signals in Fig. 1.Drive singal V on drive end GATE
gATEfor in logic 1 time, power switch 34 is opened.Power switch 34 maintains the time of unlatching, is called opening time (ON time) T
oN; Relative, power switch 34 maintains the time of closedown, is called shut-in time (OFF time) T
oFF, as shown in Figure 2.Switch periods (cycle time) T
cYCequal an opening time T
oNwith a shut-in time T
oFFsummation, as shown by Fig. 2.At opening time T
oNtime, the cross-pressure V on auxiliary winding AUX
aUXbe negative value, map input power V
iNvoltage.Now, primary side winding PRM energy storage, represents electric current I
pRMcurrent detection voltage V
cSto increase along with the time.In power switch 34 pent moment, primary side winding SEC starts to produce primary side winding current I
sEC, it reduced along with the time, until primary side winding SEC releases energy completely.As shown in Figure 2, primary side winding SEC releases the time of energy, or primary side winding current I
sECbe greater than the time of 0, be called T discharge time
dIS.At T discharge time
dIStime, cross-pressure V
aUXfor on the occasion of, approximately map out-put supply V
oUTvoltage.At T discharge time
dISafter end, cross-pressure V
aUXstart vibration, toward 0V convergence.In fig. 2, discharge time T
dISonly shut-in time T
oFFin a part because switch type power supplying device 10 be supposition operate in DCM (discontinuous conduction mode, DCM).Just in case switch type power supplying device 10 operates in continuous conduction mode (continuousconduction mode, CCM), discharge time T
dISlarge appointment equals shut-in time T
oFF.
Power-supply controller of electric 26 in Fig. 3 exemplary graph 1.Oscillator 72 arranges SR register (SRregister) 78 periodically, therefore drive singal V
gATEbecome 1 in logic, so start opening time T
oN.Sampling hold circuit 62 is in time at T discharge time
dIStime, to feedback voltage signal V
fBsample, then error amplifier 68 compares the sampled result of sampling hold circuit 62, with the target voltage V that presets
tAR, produce bucking voltage V
cOM.As current detection voltage V
cSexceed bucking voltage V
cOMtime, comparator 74 resets SR register 78, starts shut-in time T
oFF.At shut-in time T
oFFin, current detection voltage V
cSsuddenly drop to 0V, as shown in Figure 2.In other words, bucking voltage V
cOMcontrol or suppressed current detection voltage V
cSpeak value.
Discharge time, resolver 64 was electrically connected to feedback end FB, by detecting feedback voltage signal V
fBwaveform, discharge time, resolver 64 provided a discharge time signal S
dIS, indicate T discharge time
dIStime.Discharge time signal S
dISunnecessary certain for T discharge time
dISsynchronous completely.For example, in one embodiment, discharge time signal S
dISat T discharge time
dISafter starting a period of time, just become 1 in logic, then at T discharge time
dISafter terminating a period of time, just become 0 in logic, therefore, discharge time signal S
dISfor in logic 1 time, approximate greatly T discharge time
dIS.
According to discharge time signal S
dISand current detection voltage V
cS, output current estimator 70 provides load representative voltage V
lCto load compensation circuit 66.Here, load representative voltage V
lCcorrespond to a charging current I
cHARGE.To illustrate after a while, charging current I
cHARGEratio outputs to the output current I of load 24 in Fig. 1 haply
oUT.Load compensation circuit 66 produces bias current I
oFFSET, it is in discharge time, draws electric current, flow to earth connection from feedback end FB.Generally speaking, output current I
oUTlarger, charging current I
cHARGElarger, bias current I
oFFSETlarger, cross-pressure V
aUXthe sampled result maintaining more greatly sampling hold circuit 62 is just needed to approximate greatly target voltage V
tAR, so out-put supply V
oUTvoltage higher.Therefore, load compensation circuit 66 can make out-put supply V
oUTvoltage be substantially equal to " I
oUT* K
1+ K
2* V
tAR", wherein K
1with K
2two definite values.As long as suitably choose the resistance value of resistance 28 and 30, I
oUT* K
1just can approximate greatly the cross-pressure loss on the transmission line 38 in Fig. 1, therefore load 24 can receive the supply voltage (=K regulating result pretty good
2* V
tAR).Load compensation realizes at this point accurately.
Output current estimator 70 additionally provides deboost V
lIMITto comparator 76.Once current detection signal V
cSexceed deboost V
lIMIT, comparator 76 resets SR register 78, terminates opening time T
oN, and start shut-in time T
oFF.Therefore, deboost V
lIMITalso can control or suppress current detection signal V
cSpeak value.
Fig. 4 illustrates output current estimator 70, and it has transducer 90, electric potential transducer (levelshifter) 92 and 94, refresh circuit 96, collects electric capacity 98, one switch 104, Voltage-controlled Current Source (voltage-controlled current source) 102 and a CS peak voltage detector 100.
CS peak voltage detector 100 produces voltage V
cS-PEAK, which represent current detection signal V
cSa peak value.For example, the Figure 10 in U.S. Patent Application Publication No. US20100321956A1 just provides an example of CS peak voltage detector 100.In certain embodiments, CS peak voltage detector 100 can replace with the average current detection device of illustrating in Figure 17 of U.S. Patent Application Publication No. US20100321956A1 or 18 figure.Voltage-controlled Current Source 102 is by voltage V
cS-PEAKconvert discharging current I to
dIS, it only has at discharge time signal S
dISfor in logic 1 time, collecting terminal ACC is discharged.In other words, discharging current I
dISto the discharge time of collecting terminal ACC, equivalence approximates greatly T discharge time
dIS.In certain embodiments, the switch 104 in Fig. 4 can omit, and replaces, discharge time signal S
dISbe used for starting (activate) or closing (deactivate) Voltage-controlled Current Source 102.Voltage V on electric capacity 99
m, after being changed by displacement, give transducer 90, be used for a predetermined reference voltage V
rEFrelatively.Transducer 90, according to comparative result, exports charging current I
cHARGE, collecting terminal ACC is charged constantly.By detecting charging current I
cHARGE, load representative voltage V can be produced
lC.Refresh circuit 96 is by update signal S
uPDATEtriggered, to the feedback voltage V on collecting terminal ACC
aCCsampling, upgrades voltage V
m, can switch periods upgrade once at every turn.Update signal S
uPDATEand unnecessary each switch periods just makes refresh circuit 96 perform renewal once, for example, also every two switch periods renewal can be performed once.In one embodiment, update signal S
uPDATEdrive singal V can be equal to
gATE, mean that the action of renewal is at shut-in time T
oFFbe performed time at the beginning.Voltage V
mbe all remain on a definite value at ordinary times, until refresh circuit 96 is to after its renewal, just can become another definite value.According to voltage V
m, electric potential transducer 94 provides deboost V
lIMIT.Can find, as voltage V from above explanation
mtime constant, charging current I
cHARGEalso can remain unchanged.
Analyze in similar U.S. Patent Application Publication No. US20100321956A1, as charging current I
cHARGEbe a definite value, and feedback voltage V
aCCvalue when being sampled, equals the value of last time when being sampled, that charging current I
cHARGEwill be the output current I with outputting to load 24
oUTproportional.In order to make charging current I
cHARGEwith output current I
oUTproportional, so feedback voltage V
aCCvalue when being at every turn sampled, must be the same or stable.Refresh circuit 96, electric potential transducer 92 and transducer 90 together form the primary Ioops with negative loop gain (negative loop gain), and this loop finally may can make feedback voltage V
aCCvalue when being at every turn sampled, is stabilized in a value.For example, if charging current I
cHARGEbe greater than with output current I
oUTa proportional desired value, that feedback voltage V
aCCwhen the sampling of next time, will become large, cause the voltage V after renewal
malso along with change is large, therefore, charging current I
cHARGEwill diminish.Vice versa.So, charging current I
cHARGEcan in the end, the about of change follows output current I
oUTproportional.
Fig. 5 A shows in certain embodiments, charging current I
cHARGEwith voltage V
mrelation.Voltage V
mby electric potential transducer 92 and transducer 90, control charging current I
cHARGE.As shown in Fig. 5 A, the charging current I that transducer 90 exports
cHARGEnot negative value, minimum is exactly 0A.As voltage V
mlower than predeterminated voltage V
rEF-M(it corresponds to the reference voltage V in Fig. 4
rEF) time, charging current I
cHARGEapproximately a maximum, the I shown in namely on Fig. 5 A
mAX.
When load 24 not quite or very light time, output current I
oUTalso do not arrive maximum rated output current, so voltage V
mto be stabilized in and be greater than predeterminated voltage V
rEF-Mcertain value, make charging current I
cHARGEwith output current I
oUTproportional.Now, the power-supply controller of electric 26 in Fig. 3 operates in constant voltage mode, regulation output power supply V
oUTvoltage, make it be stabilized in preset value.But when load 24 is very heavy, charging current I
cHARGEi can be fixed on
mAX, and cause voltage V
mdrop to predeterminated voltage V
rEF-Munder.Now, if output current I
oUTexceed its maximum rated output current (with I
mAXratio), that voltage V
mwith deboost V
lIMITboth along with switch periods one by one, and can reduce, until deboost V
lIMITforce down voltage V
cS-PEAK, make output current I
oUTequal maximum rated output current.In other words, as voltage V
mlower than predeterminated voltage V
rEF-Mtime, power-supply controller of electric 26 can operate in constant current mode.
When surely voltage-operated, the transduction gain of transducer 90 roughly determines voltage V
mthe position of value.Transduction gain is larger, voltage V
mpossible position scope narrower, feedback voltage V
aCCmore operating voltage space just can be had to use.But transduction gain can not be too large, because improve transduction gain to also improve negative loop gain simultaneously, and excessive negative loop gain may cause vibration, make voltage V
mcannot stablize.
Fig. 5 B shows in certain embodiments, bias current I
oFFSETwith charging current I
cHARGErelation, this relation can performed by load compensation circuit 66.In one embodiment, load representative voltage V
lCwith bias current I
oFFSETcan by mapping charging current I
cHARGEproduce.In some embodiments, when load is very light or no-load time, load compensation does not need to produce.Therefore, as shown in Fig. 5 B, as charging current I
cHARGEthan a preset value I
rEFcome low time, bias current I
oFFSETjust disappear, equal 0A.As charging current I
cHARGEthan a preset value I
rEFgao Shi, both are approximately linear relationships, illustrate as the skew lines 103 in Fig. 5 B.
Output current estimator 70 only only used an inside, has the primary Ioops of negative loop gain, just reaches two important functions: provide with output current I
oUTproportional charging current I
cHARGE, and control output current I
oUTbe no more than maximum rated output current.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to claims of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (20)
1. a power-supply controller of electric, is applicable to a switch type power supplying device, and this switch type power supplying device includes the inductance element and a power switch that are cascaded, and this power-supply controller of electric includes:
One output current estimator, framework provides a current detection signal, its representative flows through an inductive current of this inductance element, and a discharge time signal, it indicates a discharge time of this inductance element, and according to this current detection signal and this discharge time signal, in order to produce a charging current, make it approximately to should the output current that exports a load of switch type power supplying device, wherein this charging current is limited to be not more than a maximum; And
One demand limiter, when this charging current equals this maximum, framework is in order to limit this current detection signal.
2. power-supply controller of electric as claimed in claim 1, wherein, this inductance element includes an auxiliary winding, and this switch type power supplying utensil has a resistance, and be connected to this auxiliary winding, this power-supply controller of electric also includes:
One load compensator, according to this charging current, framework draws a bias current from this resistance.
3. power-supply controller of electric as claimed in claim 2, wherein, when this charging current is less than a preset reference electric current, this bias current is approximately 0 ampere.
4. power-supply controller of electric as claimed in claim 1, wherein, this charging current can not be negative value.
5. power-supply controller of electric as claimed in claim 1, wherein, this output current estimator, according to this charging current, this discharge time signal and this current detection signal, produce a voltage signal, this output current estimator has a transducer, and it compares this voltage signal and a reference voltage, produces this charging current.
6. power-supply controller of electric as claimed in claim 5, wherein, this voltage signal, in each switch periods of this switch type power supplying device, upgrades once.
7. power-supply controller of electric as claimed in claim 5, wherein, this charging current continues a collecting terminal charging, this output current estimator provides a discharging current according to this current detection signal, this discharging current discharges to this collecting terminal within this discharge time, and this voltage signal is updated by the feedback voltage on this collecting terminal of sampling.
8. power-supply controller of electric as claimed in claim 7, wherein, a peak value of this current detection signal, determines this discharging current.
9. power-supply controller of electric as claimed in claim 7, wherein, this output current estimator also comprises a collection electric capacity, is connected to this collecting terminal, and a refresh circuit is connected to this collecting terminal, in order to this feedback voltage of sampling.
10. power-supply controller of electric as claimed in claim 1, wherein, this output current estimator is according to this charging current, this discharge time signal and this current detection signal, produce a voltage signal, this output current estimator also includes an electric potential transducer, and in order to this voltage signal is converted to one second voltage signal, this circuit current limiter includes a comparator, in order to compare this second voltage signal and this current detection signal, control this power switch.
11. 1 kinds of control methods, are applicable in a switch type power supplying device, and as output electric current measure, this switch type power supplying device includes an inductance element and a power switch, is serially connected, and this control method includes:
Receive a current detection signal, it roughly represents the inductive current flowing through this inductance element;
Detect this inductance element, to produce a discharge time signal, roughly indicate a discharge time of this inductance element;
According to this current detection signal and this discharge time signal, produce a charging current, wherein, this discharging current approximately represents the output current that this switch type power supplying device exports a load to;
Restriction makes this charging current be no more than a maximum; And
When this charging current equals this maximum, suppress this current detection signal.
12. control methods as claimed in claim 11, also include:
According to this current detection signal, provide a discharging current;
With this discharging current, charging is continued to a collecting terminal, and with this discharging current, within this discharge time, this collecting terminal is discharged; And
To the feedback voltage sampling on this collecting terminal, in order to upgrade this charging current.
13. control methods as claimed in claim 12, also include:
To sample this feedback voltage, in order to upgrade a voltage signal; And
Relatively this voltage signal and a reference voltage, to produce this charging current.
14. control methods as claimed in claim 13, also include:
When this voltage signal exceedes this reference voltage, this switch type power supplying device is made to operate in certain voltage pattern; And
When this voltage signal is lower than this reference voltage, this switch type power supplying device is made to operate in a constant current mode.
15. control methods as claimed in claim 11, wherein, this inductance element includes an auxiliary winding, and this switch type power supplying device includes a resistance, and be connected between this auxiliary winding and a feedback end, this control method also includes:
According to this charging current, from this resistance, draw a bias current;
Wherein, this bias current is larger, and the output voltage of this switch type power supplying device to this load is higher.
16. control methods as claimed in claim 11, also include:
It is negative that pressure makes this charging current not can be.
17. control methods as claimed in claim 13, also include:
When this voltage signal is lower than this reference signal, this charging current is made to equal this maximum.
18. 1 kinds of power-supply controller of electric, are applicable to a switch type power supplying device, and this switch type power supplying device includes the inductance element and a power switch that are cascaded, and this power-supply controller of electric includes:
One output current estimator, framework receives a current detection signal and a discharge time signal, this current detection signal roughly represents the inductive current flowing through this inductance element, this discharge time signal approximately indicates a discharge time of this inductance element, this output current estimator is according to this current detection signal and this discharge time signal, produce a charging current, this charging current is roughly to should the output current that exports a load of switch type power supplying device; And
One load compensator, according to this charging current, framework draws a bias current from a resistance, flows to an earth connection;
Wherein, this inductance element includes an auxiliary winding, and this resistance is connected between this auxiliary winding and this load compensator.
19. power-supply controller of electric as claimed in claim 18, wherein, this charging current is limited to be not more than a maximum.
20. power-supply controller of electric as claimed in claim 19, wherein, it is negative value that this output current estimator makes this charging current not.
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