CN105576947A - Switching power supply controller and switching power supply employing the same - Google Patents
Switching power supply controller and switching power supply employing the same Download PDFInfo
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- CN105576947A CN105576947A CN201610079361.9A CN201610079361A CN105576947A CN 105576947 A CN105576947 A CN 105576947A CN 201610079361 A CN201610079361 A CN 201610079361A CN 105576947 A CN105576947 A CN 105576947A
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- power supply
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Dc-Dc Converters (AREA)
Abstract
The invention provides a switching power supply controller and a switching power supply employing the same. The switching power supply controller makes a value of detection voltage on a multiplex pin thereof represent an error compensation value between an output signal and an output reference signal during turn-off of a main power tube of the switching power supply and reduces the value of the detection voltage to a valley value along with the increase of inductive current during conduction of the main power tube, and then the switching power supply controller controls the switching power supply to output an expected output signal according to the detection signal. Through the control way, the number of pins of the switching power supply controller can be decreased and the production cost of the switching power supply can be reduced.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of switch power controller and apply its Switching Power Supply.
Background technology
Switching Power Supply is made up of on-off controller and power stage circuit, on-off controller is by controlling the on off state of the main power tube in power stage circuit, Switching Power Supply is made to export substantially constant output signal supply load, such as, when allowing load be LED, Switching Power Supply output constant current signal, normally works with driving LED lamp.
Fig. 1 is a kind of Switching Power Supply structural representation of existing techniques in realizing, and the power stage circuit of Switching Power Supply comprises main power tube M
0, inductance L
0and rectifier diode D
0.Main power tube M
0under the control of on-off controller, carry out switch motion, thus make Switching Power Supply to LED output constant current output current.On-off controller comprises integrating control chip and is positioned at the building-out capacitor C of integrating control chip periphery
c, inductive current detects resistance R
cS, building-out capacitor C
cwith the compensation pin C of integrating control chip
oMPbe connected, with the peak current of compensating inductance electric current, and inductive current detects resistance R
cSbe connected with the current detecting pin CS of integrating control chip, with the information to integrating control chip feedback output current.Fig. 2 is the circuit diagram of the integrating control chip in Fig. 1, and as shown in Figure 2, package detection circuit is according to the detection voltage V at current detecting pin CS place
cSobtain sign inductive current and (flow through inductance L
0electric current) the voltage V of peak value
iPK, export counting circuit according to voltage V
iPKobtain the feedback voltage V of output current
fB, error amplifying circuit GM is by output reference voltage V
rEFwith feedback voltage V
fBerror is amplified, output and building-out capacitor C
cbe connected, and export bucking voltage V
cOMP, comparator CP comparative voltage V
iPKwith bucking voltage V
cOMPsize, as voltage V
iPKequal bucking voltage V
cOMPtime, export reset signal Pwm_rst to trigger RS, rest-set flip-flop is according to reset signal pwm_rst and control main power tube M
0the asserts signal Pwm_set of conducting exports pwm signal with control M
0on off state, thus make Switching Power Supply output constant current driving LED lamp.
In Switching Power Supply shown in Fig. 1, integrating control chip needs configuration two pins to come for compensating and current detecting, and the number of pins causing integrating control chip is more, is thus unfavorable for the miniaturization of chip, and manufacturing cost can not effectively reduce.
Summary of the invention
In view of this, the invention provides a kind of switch power controller and apply its Switching Power Supply, by making the mode of compensation pin and current detecting pin multiplexing come with the number of pins reducing chip, thus be conducive to the miniaturization of chip, and can manufacturing cost be reduced.
A kind of switch power controller, in order to the on off state of the main power tube in the power stage circuit of control switch power supply, described Switching Power Supply is made to export substantially invariable output signal, it is characterized in that, described switch power controller comprises complexing pin, and the signal on described complexing pin is detection signal;
In described main power tube conduction period, the value of described detection signal is decreased to valley with the rising of inductive current, and described inductive current is the electric current of the inductance flow through in described Switching Power Supply;
At described main power tube blocking interval, the value of described detection signal characterizes the error compensation value between described output signal and output reference signal;
Described switch power controller Switching Power Supply according to described detection signal system exports described output signal.
Preferably, described switch power controller, also comprises and compensates generation circuit, valley value detection circuit, error generative circuit and switch off control circuit;
Described compensation produces circuit and to sample described detection signal at described main power tube blocking interval, to produce compensating signal;
Described valley value detection circuit to be sampled described detection signal in described main power tube conducting finish time, to produce valley signal;
Described error generative circuit generates the error signal characterizing error between described output signal and described output reference signal according to described output reference signal, compensating signal and valley signal,
Described error signal is output to described complexing pin, the error compensation value characterizing described output signal with the value controlling described detection signal at described main power tube blocking interval and export between reference signal;
The described reset signal turned off for controlling described main power tube according to described detection signal generation that switches off control circuit.
Preferably, described in switch off control circuit comprise valley limit circuit,
It is the value that valley limits signal by described valley signal limiting that described valley limits circuit, to produce described reset signal.
Preferably, described in switch off control circuit and comprise conducting timing circuit,
Described conducting timing circuit produces described reset signal according to the switch controlling signal of described compensating signal and described main power tube, increases with the rising of the value of described compensating signal to make the ON time of described main power tube.
Preferably, described error generative circuit comprises reference generating circuit and error amplifying circuit;
Described reference generating circuit generates reference signal according to described compensating signal and described output reference signal, the value of described reference signal is the difference between described compensating signal and ratio reference signal, described ratio reference signal and described output reference signal proportional;
The first input end of described error amplifying circuit receives described reference signal, and in switch periods described in each, flow to the load of described Switching Power Supply at described inductive current during, second input of described error amplifying circuit receives described valley signal, during remaining time, the second input of described error amplifying circuit receives described compensating signal.
Preferably, described error generative circuit also comprises the first switch and second switch;
Described first switch is connected between the output of described valley value detection circuit and the second input of described error amplifying circuit, between the output that described second switch is connected to described compensation generation circuit and the second input of described error amplifying circuit.
Preferably, described switch power controller, also comprises switch controlling signal and produces circuit,
Described switching signal produces circuit and receives described reset signal and the asserts signal for controlling described main power tube conducting, to produce described switch controlling signal.
Preferably, described valley limits circuit and comprises comparator,
The first input end of described comparator receives described valley signal, and the second input receives valley and limits signal, and output exports described reset signal.
Preferably, described switch controlling signal produces circuit and comprises rest-set flip-flop,
The reset terminal of described rest-set flip-flop receives described reset signal, and set termination receives described asserts signal, and output exports described switch controlling signal.
Preferably, described switch power controller also comprises building-out capacitor and inductive current detects resistance,
The end of described building-out capacitor is electrically connected with described complexing pin, the second end and described power stage circuit first with reference to be electrically connected,
The first end that described inductive current detects resistance is electrically connected with the current output terminal of described main power tube, second end be electrically connected with reference to ground with described first, and the second reference of the node that is electrically connected with described main power tube of described inductive current detection resistance and described switch power controller be electrically connected.
Preferably, described switch power controller also comprises energization pins, overvoltage protection pin, grounding pin and drives pin,
Described energization pins by power supply electric capacity with described second reference be electrically connected,
Described overvoltage protection pin by overvoltage detect resistance with described second reference be electrically connected,
Described grounding pin with described second with reference to be electrically connected,
Described driving pin is used for exporting described switch controlling signal to described main power tube.
A kind of Switching Power Supply, is characterized in that, comprise the switch power controller in power stage circuit and claim 1 to 11 described in any one.
Therefore, in switch power controller provided by the invention and the Switching Power Supply applying it, described switch power controller makes the value of the detection voltage on its complexing pin characterize output signal and the error compensation value exporting reference signal at the blocking interval of the main power tube of Switching Power Supply, and make the value of described detection voltage be reduced to valley with the increase of inductive current in described main power tube conduction period, then carry out control switch power supply according to described detection signal and export the output signal expected.This control mode can reduce the pin number of switch power controller, reduces the production cost of Switching Power Supply.
Accompanying drawing explanation
By referring to the description of accompanying drawing to the embodiment of the present invention, above-mentioned and other objects, features and advantages of the present invention will be more clear, in the accompanying drawings:
Fig. 1 is a kind of Switching Power Supply structural representation of existing techniques in realizing;
Fig. 2 is the circuit diagram of the integrating control chip in Fig. 1;
Fig. 3 is the switching power circuit structural representation according to the embodiment of the present invention;
Fig. 4 is the oscillogram according to the detection voltage in the Switching Power Supply of the embodiment of the present invention;
Fig. 5 is the another kind of switching power circuit structural representation according to the embodiment of the present invention;
Fig. 6 is the circuit diagram of another Switching Power Supply according to the embodiment of the present invention;
Fig. 7 is the working waveform figure of the Switching Power Supply shown in Fig. 5.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 3 is the switching power circuit structural representation according to the embodiment of the present invention.
As shown in Figure 3, Switching Power Supply 01 comprises power stage circuit 1 and switch power controller 2.The topological classification of power stage circuit 1 can be the one in BUCK type (voltage-dropping type), BOOST type (booster type), BUCK-BOOST type (buck-boost) and FLYBACK type (inverse-excitation type type) etc., in the present embodiment, the topological classification of power stage circuit 1 is chosen as BUCK type.Power stage circuit 1 comprises main power tube M
1, rectifier diode D
1and inductance L
1.Switch power controller 2 is by controlling main power tube M
1on off state, make Switching Power Supply 01 by input voltage V
iNconvert one to and constant output signal to load.As shown in Figure 3, in the present embodiment, the load of Switching Power Supply 01 is LED string, then the output signal of Switching Power Supply 01 is that constant output current (uses I
orepresent, in figure unmarked go out), when the resistance of LED string remains unchanged, the voltage V on LED string
oalso be substantially maintained is a steady state value.
Switch power controller 2 comprises integrating control chip 21, also can comprise the peripheral components being positioned at integrating control chip 21 periphery further, as building-out capacitor C
c1resistance R is detected with inductive current
cS1.Building-out capacitor C
c1be connected to the reference ground GND of complexing pin CCS and power stage circuit 1
1between, inductive current detects resistance R
cS1be connected to main power tube M
1current output terminal (if main power tube M
1for N-type MOSFET, then its current output terminal is source electrode) and with reference to ground GND
1between, to detect inductive current I
lsize, and inductive current detects resistance R
cS1with main power tube M
1the reference ground GND of the node be connected and integrating control chip 21
2electrical connection.
Make building-out capacitor C
c1on voltage V
c, at main power tube M
1conduction period, inductive current I
lby main power tube M
1flow to inductive current and detect resistance R
cS1, then inductive current detects resistance R
cS1on pressure drop be I
l× R
cS1.Because inductive current detects resistance R
cS1with main power tube M
1the reference ground GND of the node be connected and integrating control chip 21
2electrical connection, relative to the reference ground GND of integrating control chip 21
2, with reference to ground GND
1the voltage at place is at main power tube M
1the size of conduction period is-I
l× R
cS1, then voltage V is detected
cCS=V
c-I
l× R
cS, the voltage V on usual electric capacity
cresistance R is detected relative to inductive current
cS1on the change of pressure drop substantially remain unchanged.Therefore at main power tube M
1conduction period, detect voltage V
cCSvalue can along with inductive current I
lrising and be reduced to valley, described valley is in each switch periods, inductive current I
lrise to its peak I
pKtime, detect voltage V
cCSsize.Due at main power tube M
1conduction period, detect voltage V
cCSsize basic only according to inductive current I
lchange and change, and inductive current I
loutput current I can be characterized again
osize.Therefore, at main power tube M
1conduction period, detect voltage V
cCSoutput current I can be characterized
o, complexing pin V
cCSas current detecting pin.
Owing to detecting resistance R by inductive current
cS1detect inductive current I
lpeak I
pKthere is certain error, thus the output current I of Switching Power Supply 01 can be made
othere is certain error between (output signal) with output reference current IREF (exporting reference signal, the desired output electric current of Switching Power Supply 01), therefore switch power controller 2 needs can characterize output current I according to one
owith output reference current I
rEFbetween the signal of error compensation value come inductive current I
lpeak I
pKthe signal compensated, this signal, in each switch periods, keeps substantially constant usually.
At main power tube M
1blocking interval, detects voltage V
cCSvalue just equal building-out capacitor C
c1on voltage V
c, it is a substantially invariable voltage, can characterize output current I with one
owith output reference current I
rEFbetween the electric current of signal of error compensation value come building-out capacitor C
c1carry out discharge and recharge, make electric capacity C
c1on voltage V
cvalue can characterize output current I
oand the error compensation value exported between reference current IREF.Therefore, complexing pin CCS goes back reusable while as current detecting pin is compensation pin for supplementary inductive current peak.
In the present embodiment, the detection voltage V on complexing pin CCS
cCSvalue at main power tube M
1blocking interval Characterization Characterization output current I
owith output reference current I
rEFbetween error compensation value, and at main power tube M
1conduction period, detect voltage V
cCSvalue with inductive current I
lrising and be decreased to valley, then detect voltage V
cCSoscillogram as shown in Figure 4.As can be seen here, voltage V is detected
cCSat main power tube M
1difference V between the value of blocking interval and described valley
iPKbe and characterize inductive current I
lpeak I
pKvalue.Therefore in the present embodiment, switch power controller 2 can according to detection voltage V
cCSproduce control switch power supply 01 and export substantially invariable output current I
o.Such as, switch power controller 2 can detect voltage V by limiting
cCSin the size of main power tube conducting finish time, i.e. valley point voltage V
vYsize carry out in control switch power supply 01 main power tube M
1on off state, at main power tube M
1after conducting, once valley point voltage V be detected
vYwhen being reduced to limited value, just control main power tube M
1turn off.In addition, switch power controller 2 also can according to detection voltage V
cCSat main power tube M
1the size of blocking interval, i.e. bucking voltage V
cOMPsize carry out in control switch power supply 01 main power tube M
1on off state, at main power tube M
1after conducting, switch power controller 2 is according to bucking voltage V
cOMPsize timing, turn off main power tube M in timing finish time
1, wherein bucking voltage V
cOMPlarger, timing time is longer.
In addition, the integrating control chip 21 of switch power controller 2 is also provided with energization pins VCC, overvoltage protection pin OVP, grounding pin GND and drives pin DRV.Energization pins VCC is by power supply electric capacity C
vCC1with reference ground GND
2electrical connection, overvoltage protection pin OVP detects resistance R by overvoltage
oVP1with reference ground GND
1electrical connection, grounding pin GND and reference ground GND
1electrical connection, drives pin to be used for main power tube M
1output switch control signal.
Fig. 5 is the another kind of switching power circuit structural representation according to the embodiment of the present invention.
As shown in Figure 5, the power stage circuit 1 of Switching Power Supply 02 and identical in Fig. 3, no longer describe at this, and the present embodiment specifically describes the switch power controller 2 of Switching Power Supply 02.The integrating control chip 21 of switch power controller 2 comprises compensation and produces circuit 211, valley value detection circuit 212, error generative circuit 213 and switch off control circuit 214, also can comprise switching signal and produce circuit 215.
At each switch periods (main power tube M
1switch periods) in, compensate produce circuit 211 at main power tube M
1detection voltage V on blocking interval sample detecting complexing pin CCS
cCS, such as, to produce the compensating signal of size kept stable in a switch periods, bucking voltage V
cOMP.And valley value detection circuit 212 is at main power tube M
1detection voltage V on the finish time sampling complexing pin CCS of conducting
cCS, to produce a valley signal, such as valley point voltage V
vY, valley point voltage V
vYvalue in each switch periods, equal main power tube M in this switch periods
1the detection voltage V of conducting finish time
cCSvalue, namely detect voltage V
cCSvalley in this switch periods.Embodiment as shown in Figure 3 can be learnt, the difference between bucking voltage and valley point voltage and inductive current and inductive current I
lin direct ratio, then this difference can characterize inductive current I
lpeak current I
pK.Therefore, error generative circuit 213 is according to output reference current I
rEF, bucking voltage V
cOMPand valley point voltage V
vYgenerate one and characterize output current I
owith output reference current I
rEFbetween the error signal I of error
gM.Error signal I
gMbe transferred to complexing pin CCS, and to building-out capacitor C
c1carry out discharge and recharge process, to control to detect voltage V
cCSvalue at main power tube M
1blocking interval characterizes output current I
owith output reference current I
rEFbetween error compensation value.Switch off control circuit and 214 to produce for controlling main power tube M according to detection voltage VCCS
1the reset signal PWM_rst turned off.Such as, switch off control circuit and 214 can detect voltage V by limiting
cCSin the size of main power tube conducting finish time, i.e. valley point voltage V
vYsize control main power tube M
1on off state, at main power tube M
1after conducting, once valley point voltage V be detected
vYwhen being reduced to limited value, just control main power tube M
1turn off.In addition, switching off control circuit 214 also can according to detection voltage V
cCSat main power tube M
1the size of blocking interval, i.e. bucking voltage V
cOMPsize control main power tube M
1on off state, at main power tube M
1after conducting, switch power controller 2 is according to bucking voltage V
cOMPsize timing, turn off main power tube M in timing finish time
1, wherein bucking voltage V
cOMPlarger, timing time is longer.
In the present embodiment, switch off control circuit 214 for valley restriction circuit, valley limits circuit 214 for limiting valley point voltage V
vYsize, and produce for controlling main power tube M
1the reset signal PWM_rst turned off.
In other embodiments, switching off control circuit 214 can also for conducting timing circuit, and described conducting timing circuit is according to described bucking voltage V
cOMPwith main power tube M
1switch controlling signal PWM produce reset signal PWM_rst, to make main power tube M
1oN time with repaying voltage V
cOMPvalue rising and increase.
Further, reset signal PWM_rst with for controlling main power tube M
1the asserts signal PWM_set of conducting is transferred to switching signal and produces circuit 215, and switching signal produces circuit 215 and produces main power tube M according to received signal
1switch controlling signal PWM.Such as, at main power tube M
1after conducting, described conducting timing circuit is according to bucking voltage V
cOMPsize timing, turn off main power tube M in timing finish time
1, wherein bucking voltage V
cOMPlarger, timing time is longer.
As shown in Figure 5, error generative circuit 213 comprises reference generating circuit 2131 and error amplifying circuit 2132 further.
Reference generating circuit 2131 is according to bucking voltage V
cOMPwith output reference current I
rEFgenerate reference signal V
rEF2, the value of reference signal VREF2 is bucking voltage V
cOMPwith ratio reference signal V
rEF1between difference.Therefore, reference generating circuit 2131 can be a subtraction circuit.Ratio reference signal V
rEF1with output reference current I
rEFproportional, i.e. ratio reference signal V
rEF1be one and characterize the signal exporting reference current IREF, ratio reference signal V
rEF1with output reference current I
rEFbetween ratio be generally 2 × R
cS1.
The first input end (as reverse input end "-") of error amplifying circuit 2132 receives reference signal VREF2, and in switch periods described in each, at inductive current I
lflow to load (LED) period of Switching Power Supply A, second input (as in-phase input end "+") of error amplifying circuit 2132 receives valley point voltage V
vY, during remaining time, the second input of error amplifying circuit 2132 receives bucking voltage V
cOMP, error amplifying circuit 2132 can be error amplifier GM.The ratio accounting for whole switch periods described remaining time may not be identical in the Switching Power Supply of different topology type, such as in the step-down row Switching Power Supply of critical mode of operation, in whole switch periods, inductive current all can flow to the load of Switching Power Supply, therefore described remaining time is zero, and in the booster type or inverse-excitation type type Switching Power Supply of critical mode of operation, inductive current is in the load only flowing to Switching Power Supply at main power tube blocking interval of Switching Power Supply, therefore, described remaining time is described main power tube conduction period.And in the Switching Power Supply of discontinuous operating mode, the ratio that the time that inductive current flows to the load of Switching Power Supply accounts for whole switch periods is known, then described remaining time is also known.
In the embodiment shown in fig. 5, Switching Power Supply is the adjusting and voltage-reduction switch power supply of critical mode of operation, therefore in whole switch periods process, and inductive current I
lcurrent-sharing overload LED, then the second input of error amplifying circuit 2132 is directly connected with the output of valuation testing circuit 212, to receive valuation voltage V
vY.
Fig. 6 is the circuit diagram of another Switching Power Supply according to the embodiment of the present invention.
As shown in Figure 6, the main power tube in Switching Power Supply 03 in power stage circuit 1 still uses M
1represent (not shown), and Switching Power Supply shown in Fig. 6 is roughly the same with the circuit structure of the Switching Power Supply 02 shown in Fig. 5, unlike in the Switching Power Supply shown in Fig. 6, described remaining time is non-vanishing, therefore, in switch power controller 2, switching tube S is directly provided with at the output of valley value detection circuit 212 and the second input of error amplifying circuit 2132
1, and switching tube S is provided with between the output compensating generation circuit 211 and the second input of error amplifying circuit 2132
2.In each switch periods, switching tube S
1at inductive current I
lconducting during (unmarked in Fig. 6) flows to the load of Switching Power Supply, turned off during section in described remaining time, and switching tube S
2contrary with the conducting state of switching tube S1.
As shown in Figure 5 or Figure 6, it is comparator CP that valley limits circuit 214, and the first input end (as homophase income end "+") of comparator CP receives valley point voltage V
vY, the second input (as inverting input "-") receives valley stop voltage V
lIM(valley restriction signal), as valley point voltage V
vYbe reduced to valley stop voltage V
lIMtime, the switch controlling signal PWM that the reset signal PWM_rst that comparator CP just exports effective (as high level is effective) goes control switch signal generating circuit 215 to produce controls main power tube M1 and turns off.It is a rest-set flip-flop that switching signal produces circuit 215, and the reset terminal of this trigger receives reset signal PWM_rst, and set termination is received one and controlled main power tube M
1the asserts signal PWM_set of conducting, output output switch control signal PWM.
Fig. 7 is the working waveform figure of the Switching Power Supply shown in Fig. 5.The course of work and the control principle of the Switching Power Supply that the embodiment of the present invention provides specifically is set forth below in conjunction with Fig. 5 and Fig. 7.
The input voltage V of Switching Power Supply
iNfor steamed bun ripple, described steamed bun wave period is the power frequency period of Switching Power Supply, such as t
0~ t
7it is half power frequency period.Every half power frequency period comprises multiple switch periods, then, in half power frequency period, detect voltage V
cCSwaveform as shown in the waveform in the second coordinate in Fig. 7, the enlarged drawing of this waveform is same as shown in Figure 4, and we can think in a switch periods, detects voltage V
cCSvalue main power tube blocking interval relative to inductive current change substantially remain unchanged, but due to error signal I
gMto detection voltage V
cCSadjustment, make in different switch periods, detect voltage and change to some extent in the value of main power tube blocking interval, the basic and input voltage V of the trend of change
iNvariation tendency consistent.Therefore, in half power frequency period, bucking voltage V
cOMPwaveform as shown in the waveform in the coordinate of the 3rd in Fig. 7, bucking voltage V
cOMPbe a basicly stable voltage, therefore can as the peak compensation voltage of inductive current.
At t
0to t
1period, due to input voltage V
iNvalue be less than output voltage Vo, and the circuit shown in Fig. 5 is adjusting and voltage-reduction switch power supply, and therefore in this time period, Switching Power Supply does not work.
At t
1to t
3period, due to input voltage V
iNstill less, it is comparatively slow that inductive current rises, and detects voltage V
cCSvalue decline also slow in main power tube conduction period, be subject to the impact of the maximum ON time set in switch power controller, detect voltage V
cCSvalley also do not reach valley limit value before, main power tube just turns off, therefore, during this time period, valley point voltage V
vYbe greater than valley stop voltage V
lIM, input voltage V
iNincrease, valley point voltage V
vYreduce.
At t
3~ t
4period, input voltage V
iNcomparatively large, valley point voltage V
vYcan decline fast, once valley point voltage V
vYbe reduced to valley stop voltage V
lIMtime, main power tube M
1just be turned off, therefore, during this time period, valley point voltage V
vYsize be restricted to valley stop voltage V
vYsize, thus achieve the restriction of the crest voltage to inductive current, make the output current of Switching Power Supply be maintained the value exporting reference current, namely when load resistance is constant, the voltage V in load
omaintain constant.
At t
4~ t
6period, due to input voltage V
iNless, and be in a state slowly diminished, therefore, same because the reason of maximum ON time, during this period, valley point voltage V
vYbe greater than valley stop voltage V
lIM, and increase along with the reduction of input voltage.
At t
6to t
7period, due to input voltage V
iNvalue be less than output voltage Vo, therefore in this time period, Switching Power Supply does not work equally, can obtain thus, valley point voltage V
vYwaveform as shown in the chain-dotted line waveform in the coordinate of the 3rd in Fig. 7.
Due to reference voltage V
rEF2value be bucking voltage V
cOMPwith ratio reference voltage V
rEF1difference, therefore reference voltage V
rEF2waveform and bucking voltage V
cOMPchange curve consistent, as shown in the waveform in the coordinate of the 3rd in Fig. 7.
At t
0~ t
2period, valley point voltage V
vYbe greater than reference voltage V
rEF2, illustrate that now output current, relative to less than normal output reference current, needs to increase the peak value of inductive current, to strengthen actual output current.Therefore, then in Figure 5, the error signal I of error amplifying circuit 2132 output
gMto building-out capacitor C
c1charging, makes bucking voltage V
cOMPvalue slowly increase, with the peak value of more compensating inductance electric current.
At t
2~ t
5period, valley point voltage V
vYbe less than reference voltage V
rEF2, illustrate that now output current, relative to bigger than normal output reference current, needs to reduce the peak value of inductive current, to strengthen actual output current.Therefore, then in Figure 5, the error signal I of error amplifying circuit 2132 output
gMto building-out capacitor C
c1electric discharge, makes bucking voltage V
cOMPvalue slowly reduce, to reduce the compensation to inductive current peak.
In sum, in switch power controller provided by the invention and the Switching Power Supply applying it, described switch power controller makes the value of the detection voltage on its complexing pin characterize output signal and the error compensation value exporting reference signal at the blocking interval of the main power tube of Switching Power Supply, and make the value of described detection voltage be reduced to valley with the increase of inductive current in described main power tube conduction period, then carry out control switch power supply according to described detection signal and export the output signal expected.This control mode can reduce the pin number of switch power controller, reduces the production cost of Switching Power Supply.
Above embodiments of the invention are described.But these embodiments are only used to the object illustrated, and are not intended to limit the scope of the invention.Scope of the present invention is by claims and equivalents thereof.Do not depart from the scope of the present invention, those skilled in the art can make multiple substituting and amendment, and these substitute and amendment all should fall within the scope of the present invention.
Claims (12)
1. a switch power controller, in order to the on off state of the main power tube in the power stage circuit of control switch power supply, described Switching Power Supply is made to export substantially invariable output signal, it is characterized in that, described switch power controller comprises complexing pin, and the signal on described complexing pin is detection signal;
In described main power tube conduction period, the value of described detection signal is decreased to valley with the rising of inductive current, and described inductive current is the electric current of the inductance flow through in described Switching Power Supply;
At described main power tube blocking interval, the value of described detection signal characterizes the error compensation value between described output signal and output reference signal;
Described switch power controller controls described Switching Power Supply according to described detection signal and exports described output signal.
2. switch power controller according to claim 1, is characterized in that, also comprises compensating producing circuit, valley value detection circuit, error generative circuit and switching off control circuit;
Described compensation produces circuit and to sample described detection signal at described main power tube blocking interval, to produce compensating signal;
Described valley value detection circuit to be sampled described detection signal in described main power tube conducting finish time, to produce valley signal;
Described error generative circuit generates the error signal characterizing error between described output signal and described output reference signal according to described output reference signal, compensating signal and valley signal,
Described error signal is output to described complexing pin, the error compensation value characterizing described output signal with the value controlling described detection signal at described main power tube blocking interval and export between reference signal;
The described reset signal turned off for controlling described main power tube according to described detection signal generation that switches off control circuit.
3. switch power controller according to claim 2, is characterized in that, described in switch off control circuit comprise valley limit circuit,
It is the value that valley limits signal by described valley signal limiting that described valley limits circuit, to produce described reset signal.
4. switch power controller according to claim 2, is characterized in that, described in switch off control circuit and comprise conducting timing circuit,
Described conducting timing circuit produces described reset signal according to the switch controlling signal of described compensating signal and described main power tube, increases with the rising of the value of described compensating signal to make the ON time of described main power tube.
5. switch power controller according to claim 2, is characterized in that, described error generative circuit comprises reference generating circuit and error amplifying circuit;
Described reference generating circuit generates reference signal according to described compensating signal and described output reference signal, the value of described reference signal is the difference between described compensating signal and ratio reference signal, described ratio reference signal and described output reference signal proportional;
The first input end of described error amplifying circuit receives described reference signal, and in switch periods described in each, flow to the load of described Switching Power Supply at described inductive current during, second input of described error amplifying circuit receives described valley signal, during remaining time, the second input of described error amplifying circuit receives described compensating signal.
6. switch power controller according to claim 5, is characterized in that, described error generative circuit also comprises the first switch and second switch;
Described first switch is connected between the output of described valley value detection circuit and the second input of described error amplifying circuit, between the output that described second switch is connected to described compensation generation circuit and the second input of described error amplifying circuit.
7. switch power controller according to claim 2, is characterized in that, also comprises switch controlling signal and produces circuit,
Described switching signal produces circuit and receives described reset signal and the asserts signal for controlling described main power tube conducting, to produce described switch controlling signal.
8. switch power controller according to claim 3, is characterized in that, described valley limits circuit and comprises comparator,
The first input end of described comparator receives described valley signal, and the second input receives valley and limits signal, and output exports described reset signal.
9. switch power controller according to claim 2, is characterized in that, described switch controlling signal produces circuit and comprises rest-set flip-flop,
The reset terminal of described rest-set flip-flop receives described reset signal, and set termination receives described asserts signal, and output exports described switch controlling signal.
10. switch power controller according to claim 2, is characterized in that, also comprises building-out capacitor and inductive current detection resistance,
The end of described building-out capacitor is electrically connected with described complexing pin, the second end and described power stage circuit first with reference to be electrically connected,
The first end that described inductive current detects resistance is electrically connected with the current output terminal of described main power tube, second end be electrically connected with reference to ground with described first, and the second reference of the node that is electrically connected with described main power tube of described inductive current detection resistance and described switch power controller be electrically connected.
11. switch power controllers according to claim 10, is characterized in that, also comprise energization pins, overvoltage protection pin, grounding pin and drive pin,
Described energization pins by power supply electric capacity with described second reference be electrically connected,
Described overvoltage protection pin by overvoltage detect resistance with described second reference be electrically connected,
Described grounding pin with described second with reference to be electrically connected,
Described driving pin is used for exporting described switch controlling signal to described main power tube.
12. 1 kinds of Switching Power Supplies, is characterized in that, comprise the switch power controller in power stage circuit and claim 1 to 11 described in any one.
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