CN105722274B - Active power factor correction control circuit, chip and LED drive circuit - Google Patents
Active power factor correction control circuit, chip and LED drive circuit Download PDFInfo
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- CN105722274B CN105722274B CN201610146219.1A CN201610146219A CN105722274B CN 105722274 B CN105722274 B CN 105722274B CN 201610146219 A CN201610146219 A CN 201610146219A CN 105722274 B CN105722274 B CN 105722274B
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The present invention provides a kind of APFC control circuits, including output electric current counting circuit, error calculation circuit, inductive current zero cross detection circuit and duty ratio counting circuit.Foregoing circuit uses direct current supply voltage to provide constant voltage for the grid of DC-DC converter power switch tube, only the periodic on and off of power switch tube is controlled by adjusting the source voltage of power switch tube, to drive DC-DC converter to work, debugging when making using the APFC control circuit is simpler.In addition, above-mentioned APFC control circuit can be directly integrated on the same chip, the number of pins of chip is only 4, to reduce the number and complexity of peripheral circuit, it further solves when improving the PF value of LED drive circuit using APFC control circuit, LED drive circuit debugs cumbersome problem.
Description
The application is application No. is 201310701205.8, and the applying date is on December 18th, 2013, entitled " active
The divisional application of power factor correction control circuit, chip and LED drive circuit ".
Technical field
The present invention relates to power electronics fields, control electricity more specifically to a kind of active power factor correction
Road, chip and LED drive circuit.
Background technique
LED (Light-Emitting Diode, light emitting diode) is relative to photophores such as traditional incandescent lamp, fluorescent lamps
Part has many advantages, such as service life length, green non-pollution, has boundless application prospect.
LED needs to meet relevant harmonic standard as illuminating product, therefore requires the PF of LED drive circuit
(Power Factor, power factor) value is higher.In order to improve PF value, Yao Caiyong PFC (Power Factor Correction,
PFC).PFC point for PPFC (Passive Power Factor Correction, passive power factor correction) and
APFC (Active Power Factor Correction, active power factor correction).
DC-DC converter and APFC control circuit are specifically included that using the LED drive circuit of APFC, wherein straight
Stream-DC converter is connected with load LED.It drives in the course of work, AC-input voltage is converted to after over commutation and filtering
DC input voitage, DC-DC converter carry out voltage transformation to the DC input voitage, finally obtain needed for load LED
Driving voltage, realize driving to LED.In the process, APFC control circuit to DC-DC converter by exporting
PWM (Pulse Width Modulation, pulse width modulation) signal, controls the power switch tube of DC-DC converter
On and off, to improve the PF value of LED drive circuit.
But in LED drive circuit, if realizing high PF value using APFC, APFC control circuit can be relatively easy.
Currently, most of APFC control circuits are integrated in the chips, to realize to the DC-DC converter of LED drive circuit compared with
Good to adjust, then the peripheral circuit of the chip is more and more complex, causes the debugging of circuit cumbersome.
Summary of the invention
The present invention provides a kind of APFC control chip and LED drive circuits, to solve to mention when using APFC control circuit
The problem that when the PF value of high LED drive circuit, LED drive circuit is complicated for operation, debugging is cumbersome.
To achieve the above object, the present invention provides the following technical scheme that
The invention proposes a kind of active power factor correction controller ICs, comprising:
First pin, second pin, third pin and the 4th pin；
Inductive current zero cross detection circuit, the grid that first input end passes through the second pin and the power switch tube
Pole, and be connected by the third pin with direct current supply voltage, to detect the electric current for flowing through inductance, and in the inductance
Electric current when being decreased to zero, generate comparison signal；
Electric current counting circuit, including first switch tube are exported, the first end of the first switch tube is drawn by described first
Foot is connected with the first end of the power switch tube；
Error calculation circuit, input terminal are connected by the 4th pin with filter circuit, the filter circuit pair
Output is to the error calculation circuit to generate after the current feedback signal that the output electric current counting circuit generates is filtered
Thermal compensation signal；Duty ratio counting circuit receives the thermal compensation signal and the comparison signal to generate pulse width modulating signal
And trigger signal, the pulse width modulating signal are exported to the output electric current counting circuit, to drive the power switch
Manage periodic turn-on and turn-off；The trigger signal is exported to the output electric current counting circuit, to control the output electricity
Stream calculation circuit generates current feedback signal.
The invention also provides a kind of LED drive circuits, comprising: DC-DC converter and above-mentioned active power factor
Correcting controlling chip and filter circuit；
The DC-DC converter is used under the driving of the active power factor correction controller IC to described
The input voltage of LED drive circuit is converted, to generate output electric current；
The filter circuit is converted to the current feedback signal for being filtered to the current feedback signal
Characterize the voltage feedback signal of the current feedback signal.
Compared with prior art, technical solution provided by the present invention has at least the following advantages:
In APFC control chip and LED drive circuit provided by the present invention, it includes output galvanometer that APFC, which controls chip,
Circuit, error calculation circuit, inductive current zero cross detection circuit and duty ratio counting circuit are calculated, it is straight for using direct current supply voltage
The grid of stream-DC converter power switch tube provides constant voltage, only passes through control circuit driving power switching tube
Source electrode can be achieved with the adjustment to power switch tube source voltage, and then control the variation of power switch tube gate source voltage, make function
The on and off of rate switching tube generating period, to drive DC-DC converter to work.It is above-mentioned only change source voltage into
The mode of row driving, compared with the existing technology in adjust the mode that the voltage of grid and source electrode is driven simultaneously, make using should
Debugging when APFC control chip is simpler.
In addition, the number of pins of above-mentioned APFC control chip is only 4, to reduce the number and complexity of peripheral circuit
Degree further solves the LED drive circuit debugging when improving the PF value of LED drive circuit using APFC control circuit
Cumbersome problem.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure chart of APFC control circuit provided by the embodiment of the present invention one；
Fig. 2 is the structure chart of APFC control circuit provided by the embodiment of the present invention two；
Fig. 3 is the structure chart of APFC control circuit provided by the embodiment of the present invention three；
Fig. 4 is the structure chart of APFC control circuit provided by the embodiment of the present invention four；
Fig. 5 is the structure chart that APFC provided by the embodiment of the present invention five controls chip；
Fig. 6 is the structure chart of LED drive circuit provided by the embodiment of the present invention six.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, but the present invention can be with
Implemented using other than the one described here other way, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by the specific embodiments disclosed below.
Embodiment one
A kind of APFC control circuit is present embodiments provided, which is used to that DC-DC converter to be driven to work,
To improve the power factor value of DC-DC converter.The structure of the control circuit in figure for APFC as shown in Figure 1,10 control
Circuit, 11 be DC-DC converter, and APFC control circuit 10 includes: output electric current counting circuit 101, error calculation circuit
102, inductive current zero cross detection circuit 103 and duty ratio counting circuit 104.
The first input end of output electric current counting circuit 101 is connected with the first output end of duty ratio counting circuit 104, the
Two input terminals are connected with the second output terminal of duty ratio counting circuit 104, the function of third input terminal and DC-DC converter 11
Rate switching tube QbSource electrode be connected, output end is connected with the input terminal of error calculation circuit 102；Error calculation circuit 102 it is defeated
Outlet is connected with the first input end of duty ratio counting circuit 104；The first input end of inductive current zero cross detection circuit 103 point
Not with direct current supply voltage VCCWith power switch tube QbGrid be connected, the second input terminal and power switch tube QbSource electrode phase
Even, output end is connected with the second input terminal of duty ratio counting circuit 104.
In above-mentioned APFC control circuit 10, output electric current counting circuit 101 flows through inductance L by samplingbElectric current, obtain
Flow through inductance LbElectric current situation of change, flowing through inductance LbElectric current when reaching peak value, generate a current feedback signal IFB；
Error calculation circuit 102 obtains characterization current feedback signal IFBVoltage feedback signal, response duty ratio counting circuit 104 it is defeated
Trigger signal out to generate thermal compensation signal, and the thermal compensation signal is exported to duty ratio counting circuit 104；Inductive current mistake
Inductance L is flowed through in the detection of zero detection circuit 103bElectric current, flowing through inductance LbElectric current when being decreased to zero, generate comparison signal, and
The comparison signal is exported to duty ratio counting circuit 104；Duty ratio counting circuit 104 receives thermal compensation signal and comparison signal,
To generate pulse width modulating signal PWM and trigger signal TDIS, and pulse width modulating signal PWM is exported and gives output electric current
Counting circuit 101, with driving power switching tube QbPeriodic turn-on and turn-off, by trigger signal TDISIt exports and gives output electric current
Counting circuit 101 generates current feedback signal I with control output electric current counting circuit 101FB。
In the present embodiment, the power switch tube Q of DC-DC converter 11bGrid and direct current supply voltage VCCIt is connected,
That is direct current supply voltage VCCFor power switch tube QbProvide a bias voltage, power switch tube QbGrid voltage it is constant not
Become.Power switch tube QbSource electrode with output electric current counting circuit 101 third input terminal be connected, when export electric current counting circuit
When the voltage of 101 third input terminal changes, power switch tube QbSource voltage also change therewith, thus power switch
Pipe QbGate source voltage variation, make power switch tube QbOn or off.As it can be seen that APFC control circuit provided by the present embodiment
10 be to carry out driving power switching tube Q by using the mode of source drivebWork, and in the prior art generally by function
The grid and source voltage of rate switching tube could be adjusted to the work of driving power switching tube simultaneously, therefore in the present embodiment
Than in the prior art simple of APFC control circuit 10, so that debugging when in use is also just simplified.
In addition, specifically including that power switch tube Q in DC-DC converter 11bWith inductance Lb, can also include: capacitor
CbWith diode Db, capacitor CbWith load LED it is in parallel after with inductance LbA branch in series, diode DbIt is connected in parallel on capacitor Cb、
Load LED and inductance LbThe branch both ends constituted, input voltage vgTo capacitor Cb, load LED and inductance LbThe branch constituted
DC voltage is provided, power switch tube Q is passed throughbOn and off control foregoing circuit to input voltage vgConverted (drop
Pressure or boosting etc.).
Embodiment two
Based on embodiment one, a kind of APFC control circuit 10 is present embodiments provided, as shown in Fig. 2, exporting in the circuit
Electric current counting circuit 101 includes: first switch tube M1, inductive current peak detection circuit 1011 and current feedback signal generate electricity
Road 1012.
First switch tube M1Grid as it is described output electric current counting circuit 101 first input end and duty ratio calculate
First output end of circuit 104 is connected, and drains and becomes as the third input terminal and DC-DC of output electric current counting circuit 101
The power switch tube Q of parallel operation 11bSource electrode be connected, source electrode ground connection；The input terminal of inductive current peak detection circuit 1011 and
One switching tube M1Drain electrode be connected, output end is connected with the input terminal of current feedback signal generation circuit 1012；Current feedback letter
Input of the output end of number generation circuit 1012 as the output end and error calculation circuit 102 of output electric current counting circuit 101
End is connected.
First switch tube M1The inductance L of DC-DC converter 11 is flowed through in samplingbElectric current, therefore flow through first switch tube
M1Electric current be equal to flow through power switch tube QbElectric current；Inductive current peak detection circuit 1011 by with power switch tube Qb
Source electrode (i.e. first switch tube M1Drain electrode) be connected, obtain characterization first switch tube M1Sample the voltage letter of obtained current value
Number, detect the inductance L of DC-DC converter 11bElectric current whether reach peak value, in inductance LbElectric current when reaching peak value, will
Characterize inductance LbThe voltage signal of current peak export to current feedback signal generation circuit 1012；Current feedback signal generates
Circuit 1012 receives characterization inductance LbCurrent peak voltage signal, in trigger signal TDISUnder the action of generate electric current it is anti-
Feedback signal IFB。
In the present embodiment, first switch is controlled by the pulse width modulating signal PWM that duty ratio counting circuit 104 generates
Pipe M1On and off, and then control output give power switch tube QbSource electrode voltage signal, and then make power switch tube Qb
Periodic on or off.
It should be noted that the above-mentioned way of realization of output electric current counting circuit provided by the present embodiment is only the present invention
In the circuit implementation one kind, in other embodiments of the invention, output electric current counting circuit 101 can also use it
Its circuit and connection relationship are realized.
In addition, first switch tube M in the present embodiment1Type can be N-type, or p-type does not limit herein.
It can also be preferably in power switch tube Q in the present embodimentbGrid and direct current supply voltage VCCBetween add one
First resistor R1, first resistor R1One end and power switch tube QbGrid be connected, the other end and direct current supply voltage VCCPhase
Even, preferably for power switch tube QbGrid constant bias voltage is provided.
Embodiment three
Based on embodiment two, a kind of specific implementation circuit of APFC control circuit 10 is present embodiments provided, the circuit
Structure is as shown in Figure 3:
Export the inductive current peak detection circuit 1011 of electric current counting circuit 101 can include: the first controllable switch S1,
Two controllable switch S2, first capacitor C1With the second capacitor C2.First controllable switch S1First end as inductive current peak detect
The input terminal and first switch tube M of circuit 10111Drain electrode be connected, second end and first capacitor C1First end be connected；First electricity
Hold C1Second end ground connection；Second controllable switch S2First end and first capacitor C1First end be connected, second end with second electricity
Hold C2First end be connected；Second capacitor C2Output end and electric current of the first end as inductive current peak detection circuit 1011
The input terminal of feedback signal generation circuit 1012 is connected, second end ground connection.
In foregoing circuit, the first controllable switch S1It is controlled by the pulse width modulation letter of the generation of duty ratio counting circuit 102
Number PWM, i.e. power switch tube QbThe time of conducting, the on or off under the control of pulse width modulating signal PWM；Second
Controllable switch S2It is controlled by power switch tube QbTurn-off time TOFF, with the first controllable switch S1Complementation conducting, i.e., first is controllable
Switch S1With the second controllable switch S2The shutdown moment it is complementary with turn-on instant.Due to flowing through first switch tube M1Electric current be equal to
Flow through inductance LbElectric current, therefore when flowing through first switch tube M1Electric current when reaching peak value, pulse width modulating signal PWM mono-
Directly remain high level, the first controllable switch S1It is open-minded, then first capacitor C1Voltage be characterization flow through power switch tube QbPeak
It is worth the voltage signal of electric current, thus first capacitor C1Sampling obtains characterization power switch tube QbPeak point current voltage signal.This
When pulse width modulating signal PWM become low level, the first controllable switch S1Shutdown characterizes power switch tube QbTurn-off time
TOFFSignal be high level, the second controllable switch S2It is open-minded, then the second capacitor C2Voltage be equal to characterization power switch tube Qb's
The voltage signal of peak point current, by power switch tube QbPeak point current voltage signal export give current feedback signal generate
Circuit 1012.
Export the current feedback signal generation circuit 1012 of electric current counting circuit 101 can include: second switch M2, third
Switching tube M3, the 4th switching tube M4, the 5th switching tube M5, first comparator A1With second resistance R2.Second switch M2Grid
With third switching tube M3Grid be connected, second switch M2Grid also with second switch M2Drain electrode be connected, second switch
Pipe M2Source electrode and third switching tube M3Source electrode with direct current supply voltage VCCIt is connected, second switch M2Drain electrode and the 4th
Switching tube M4Drain electrode be connected, third switching tube M3Drain electrode and the 5th switching tube M5Drain electrode be connected；4th switching tube M4Grid
Pole is connected as the second input terminal of output electric current counting circuit 101 with the second output terminal of duty ratio counting circuit 104, source electrode
Output end as output electric current counting circuit 101 is connected with the input terminal of error calculation circuit 102；5th switching tube M5Grid
Pole and first comparator A1Output end be connected, source electrode respectively with first comparator A1Inverting input terminal and second resistance R2's
First end is connected；First comparator A1Non-inverting input terminal as the input terminal of current feedback signal generation circuit 1012 and second
Capacitor C2First end be connected；Second resistance R2Second end ground connection.
In foregoing circuit, first comparator A1Receive characterization power switch tube QbPeak point current voltage signal, with second
Resistance R2Voltage signal be compared, export the second comparison signal to control the 5th switching tube M5Conducting, and then control third and open
Close pipe M3It opens, due to second switch M2With third switching tube M3It is mirrored into relationship, therefore second switch M2It opens, simultaneously
4th switching tube M4In the trigger signal T that duty ratio counting circuit 104 generatesDISControl under, generate current feedback signal IFB。
Error calculation circuit 102 can include: trsanscondutance amplifier Gm, third controllable switch S3With third capacitor C3.Mutual conductance amplification
Device GmNon-inverting input terminal receive voltage reference signal vREF, inverting input terminal is as the input terminal of error calculation circuit 102 and
Four switching tube M4Source electrode be connected, output end and third controllable switch S3First end be connected；Third controllable switch S3Second end
With third capacitor C3First end be connected；Third capacitor C3Second end ground connection.
In foregoing circuit, third controllable switch S3, it is controlled by the pulse signal D that a duty ratio is less than or equal to 0.05c.Electricity
Flow feedback signal IFBCorresponding voltage feedback signal VFB(characterize the current feedback signal IFBVoltage feedback signal) and base
Quasi- voltage signal vREFTrsanscondutance amplifier G is inputed to respectivelym, trsanscondutance amplifier GmTo voltage feedback signal VFBBelieve with reference voltage
Number vREFOperation is carried out, voltage feedback signal V is obtainedFBRelative to reference voltage signal vREFError.Third controllable switch S3By
It controls in pulse signal DcAnd turn-on and turn-off, as third controllable switch S3When conducting, third capacitor C3It charges, then third capacitor C3
First end voltage be vc, as third controllable switch S3When shutdown, third capacitor C3Voltage vcIt is held essentially constant, thus
It generates a thermal compensation signal to export to duty ratio counting circuit 104, which characterizes voltage feedback signal VFBRelative to benchmark
Voltage signal vREFError amount.
It should be noted that if pulse signal DcDuty ratio be equal to 0.5, third capacitor C3Capacitance be equal to 1, then duty
When than being equal to 0.05, third capacitor C3Capacitance be equal to 0.1；If being not provided with third controllable switch S3, then it is believed that duty ratio etc.
In 1, then capacitance is equal to 2, by the way that third controllable switch S is arranged3, and make the pulse signal D for controlling itcDuty ratio Dc≤0.05,
Capacitance can be made to be less than or equal to 0.1.One third controllable switch S is set in foregoing circuit3, reduce third capacitor C3Capacitance, by
It is directly proportional to the volume of its own in the capacitance of capacitor, therefore third capacitor C3It can be integrated in chip, to reduce chip
Number of pins and peripheral circuit.
Inductive current zero cross detection circuit 103 includes: bias voltage source VOSWith third comparator A3.Bias voltage source VOS's
First input end and direct current supply voltage V of the anode as inductive current zero cross detection circuit 103CCIt is connected, cathode and third ratio
Compared with device A3Non-inverting input terminal be connected；Third comparator A3Inverting input terminal as inductive current zero cross detection circuit 103
Two input terminals are connected with the third input terminal of output electric current counting circuit 101, and output end is as inductive current zero cross detection circuit
103 output end is connected with the second input terminal of duty ratio counting circuit 104.
In foregoing circuit, inductance L is flowed through in the detection of inductive current zero cross detection circuit 103bElectric current, in inductance LbElectric current
When zero passage, third comparator A3High level is exported, is exported the high level as comparison signal to duty ratio counting circuit 104.
Duty ratio counting circuit 104 includes: the first trigger RS1, the second trigger RS2, impulse generator the 1041, the 4th
Comparator A4, current source Is, the 4th capacitor C4, the 4th controllable switch S4With NOT gate 1042；First trigger RS1Set end S make
For the second input terminal and third comparator A of duty ratio counting circuit 1043Output end be connected, reset terminal R and the 4th comparator
A4Output end be connected, the input terminal of output end Q NAND gate 1042 is connected, and first as duty ratio counting circuit 104 is defeated
Outlet and first switch tube M1Grid be connected；4th comparator A4Non-inverting input terminal and the 4th capacitor C4First end be connected,
First input end and third capacitor C of the inverting input terminal as duty ratio counting circuit 1043First end be connected；Current source Is's
Cathode and the 4th capacitor C4First end be connected；4th capacitor C4Second end ground connection；4th controllable switch S4First end and the
Four capacitor C4First end be connected, second end and the 4th capacitor C4Second end be connected, the 4th controllable switch S4It is controlled by NOT gate
1042 output signal；The first end of impulse generator 1041 and the first trigger RS1Set end S be connected, second end and the
Two trigger RS2Reset terminal R be connected；Second trigger RS2Set end S NAND gate 1042 input terminal be connected, output end Q
Second output terminal and the 4th switching tube M as duty ratio counting circuit 1044Grid be connected.
In foregoing circuit, when flowing through inductance LbCurrent over-zero when, third comparator A3Output high level signal (compares
Signal), after the processing of impulse generator 1041, the first trigger RS1Set end S receive the high level signal, then first
Trigger RS1The end output end Q output pulse width modulating signal PWM be high level, first switch tube M1It is open-minded, then power
Switching tube QbIt is open-minded；Become low level after NOT gate 1042 for the pulse width modulating signal PWM of high level simultaneously, so that electric
Stream source IsTo the 4th capacitor C4Charging；As the 4th capacitor C4The voltage at both ends reaches third capacitor C3When the voltage at both ends, the 4th ratio
Compared with device A4High level is exported to the first trigger RS1Reset terminal R, then the first trigger RS1Output end Q output pulse it is wide
Degree modulated signal PWM is low level, first switch tube M1It turns off, then power switch tube QbShutdown, until first switch tube M1It opens again
It is logical, a switch periods (i.e. power switch tube QbDrive cycle) work terminate, start the work of next switch periods.
As it can be seen that 10 driving power switching tube Q of APFC control circuit provided by the present embodimentbConstant period, power switch tube QbIt is open-minded
Time is constant, thus the simple debugging and operation of APFC control circuit 10.
While above-mentioned duty ratio counting circuit generates pulse width modulating signal PWM, when flowing through inductance LbElectric current
When zero passage, third comparator A3The high level of output, after impulse generator is handled, by the second trigger RS2Reset terminal R
It receives, and the received pulse-width signal PWM of set end S is also high level, then the second trigger RS2Output end Q output
Trigger signal TDISFor high level, the 4th switching tube M at this time4Conducting, while flowing through inductance LbElectric current continue to be reduced to by zero it is negative
It is worth, then the 4th switching tube M4After conducting, the inductance L that mirror image comes is forcedbFailure of current so that output current feedback letter
It number is zero.
APFC control circuit driving power switching tube Q provided by the present embodimentbConstant period, to make power switch
Pipe QbService time it is constant, make the circuit be applied to improve DC-DC converter power factor value when, debugging be able to letter
Change.
Further, by adding a controllable switch in error calculation circuit in the present embodiment, and make the controllable switch
It is controlled by the pulse signal that a duty ratio is not more than 0.05, reduces the capacitance of capacitor can accordingly, so that capacitor can be with
APFC control circuit is integrated on the same chip, reduces the number of pins and peripheral circuit number of chip, further simplifies control
Debugging when circuit processed is applied.
Example IV
The present embodiment is the further precision for improving APFC control circuit, in inductive current peak detection circuit and first
Switching tube M1Between add a current mirror circuit.Connection relationship such as Fig. 4 institute between the current mirror circuit and other circuits
Show, the first input end and first switch tube M of current mirror circuit 10131Drain electrode be connected, the second input terminal and first switch
Pipe M1Grid be connected, output end is connected with the first input end of inductive current peak detection circuit 1011, composition inductive current
The first input end of peak detection circuit 1011 passes through the current mirror circuit 1013 and first switch tube M1The indirect phase of drain electrode
Structure even.
The current mirror circuit 1013 is used for flowing through first switch tube M1Current mirror amplification, obtain image current,
Therefore the image current can equally characterize first switch tube M1Obtained current value is sampled, can characterize and flow through inductance LbElectric current；
Current mirror circuit 1013 exports the image current by mirror image amplification to inductive current peak detection circuit 1011, due to
The image current characterizes inductance LbElectric current, therefore inductive current peak detection circuit 1011 can be obtained by detecting the image current
To inductance LbElectric current when reach peak value, and since the image current is inductance LbElectric current through amplification obtain, therefore detect
Precision can than no 1013 Shi Genggao of current mirror circuit, and then enable entire APFC control circuit preferably improve power because
Numerical value.
Specifically, the current mirror circuit 1013 can include: the 6th switching tube M6, the 7th switching tube M7, the 8th switching tube
M8, the 9th switching tube M9, the second comparator A2With 3rd resistor R3；6th switching tube M6Grid and the 7th switching tube M7Grid
It is connected, the 6th switching tube M6Grid also with the 6th switching tube M6Drain electrode be connected, the 6th switching tube M6Source electrode and the 7th switch
Pipe M7Source electrode with direct current supply voltage VCCIt is connected, the 6th switching tube M6Drain electrode and the 8th switching tube M8Drain electrode be connected, the
Seven switching tube M7Drain electrode and 3rd resistor R3First end be connected, the 7th switching tube M7Drain electrode be also used as current mirror circuit
1013 output end and the first controllable switch S1First end be connected, the 6th switching tube M6With the 7th switching tube M7It is mirrored into relationship；
8th switching tube M8Grid and the second comparator A2Output end be connected, source electrode respectively with the second comparator A2Anti-phase input
End and the 9th switching tube M9Drain electrode be connected；9th switching tube M9Second input terminal of the grid as current mirror circuit 1013
With first switch tube M1Grid be connected, source electrode ground connection, the 9th switching tube M9With first switch tube M1It is mirrored into relationship；Second ratio
Compared with device A2Non-inverting input terminal as current mirror circuit 1013 first input end and first switch tube M1Drain electrode be connected；The
Three resistance R3Second end ground connection.
In foregoing circuit, if first switch tube M is flowed through in setting1With the 9th switching tube M9Electric current ratio be K:1, that is, flow through
The electric current of current mirror circuit 1013, which is equal to, flows through first switch tube M11/K times of electric current, and flow through first switch tube M1Electricity
Stream, which is equal to, flows through inductance LbElectric current, therefore flow through current mirror circuit 1013 electric current be equal to flow through inductance LbElectric current 1/K
Times.If K, less than 1, current mirror circuit 1013 flows through inductance L for what sampling obtainedb1/K times of Current amplifier, by the warp
Cross amplification, characterize inductance LbThe signal of electric current export to inductive current peak detection circuit 1011, inductive current can be made
Peak detection circuit 1011 is to inductance LbPeak point current it is more sensitive, to improve the precision to peak current detection.
The present embodiment preferably can be by 3rd resistor R3With second resistance R2Proportional setting, without the reality to resistance
Actual value is adjusted, and only by adjusting the ratio relation of the two, i.e., changeable current mirror circuit 1013 amplifies the multiple of electric current,
It reduces to 3rd resistor R3With second resistance R2The requirement of precision.
Embodiment five
A kind of APFC control chip is present embodiments provided, as shown in figure 5, APFC control chip 50 includes: embodiment
APFC control circuit described in one~example IV, the first pin T1, second pin T2, third pin T3With the 4th pin T4；
The third input terminal of the output electric current counting circuit 101 of APFC control circuit passes through the first pin T1With DC-DC converter
11 power switch tube QbSource electrode be connected；The first input end of the inductive current zero cross detection circuit 103 of APFC control circuit
Pass through second pin T2With power switch tube QbGrid be connected；The inductive current zero cross detection circuit 103 of APFC control circuit
First input end passes through third pin T3With direct current supply voltage VCCIt is connected；The error calculation circuit 102 of APFC control circuit
Input terminal passes through the 4th pin T4It is connected with filter circuit 51.
APFC provided by the present embodiment, which controls chip, will directly export electric current counting circuit 101, error calculation circuit
102, inductive current zero cross detection circuit 103 and duty ratio counting circuit 104 are integrated on the same chip, and the number of pins of chip is only
It is 4, so that the number and complexity of peripheral circuit are reduced, when making using APFC control chip increase power factor value,
The debugging of circuit is simplified.
Embodiment six
A kind of LED drive circuit is present embodiments provided, as shown in fig. 6, the LED drive circuit includes: that DC-DC becomes
APFC control circuit described in parallel operation 11, one~example IV of embodiment and filter circuit 51；Wherein, DC-DC converter
11 are used under the driving of APFC control circuit to the input voltage v of LED drive circuitgIt is converted, obtains load LED needs
DC voltage；Filter circuit 51, which is used for the current feedback that the output electric current counting circuit 101 to APFC control circuit generates, to be believed
It number is filtered, current feedback signal is converted to the voltage feedback signal for characterizing the current feedback signal.
In above-mentioned LED drive circuit, AC-input voltage vinBy rectification circuit (with bridge rectifier in the present embodiment
For be illustrated) rectification and capacitor CinFiltering after, become the input voltage v of direct currentg, then become using DC-DC
Parallel operation 11 is under the driving of APFC control circuit, to input voltage vgVoltage transformation is carried out, the work electricity of load LED is obtained
Stream makes load LED shine.
The process of APFC control circuit driving DC-DC converter 11 is described later in detail in the above-described embodiments,
Details are not described herein.It should be pointed out that generating current feedback signal I in output electric current counting circuit 101FBIt exports and gives error meter
Before calculating circuit 102, need using filter circuit 51 to current feedback signal IFBIt is filtered, current feedback signal is transformed to
Voltage feedback signal.
In the present embodiment, the DC-DC converter 11 can include: inductance LbWith power switch tube Qb, inductance Lb?
One end is connected with the cathode of load LED, second end and power switch tube QbDrain electrode be connected.
In addition, the filter circuit 51 can include: the 4th resistance R4With the 5th capacitor C5；4th resistance R4With the 5th capacitor
C5Parallel connection, the 4th resistance R4First end pass through the 4th pin T4With the input terminal of the error calculation circuit 102 of APFC control circuit
It is connected, second end ground connection.
LED drive circuit provided by the present embodiment improves the function of DC-DC converter 11 using APFC control circuit
Rate factor value, APFC control circuit is by making the power switch tube Q of DC-DC converter 11bGrid voltage it is constant, only drive
Dynamic power switch tube QbSource electrode method, driving power switching tube QbIt is switched on and off, makes power switch tube QbService time
Constant, this driving side simplifies the debugging of APFC control circuit greatly.
And the present embodiment will can further export electric current counting circuit 101, error calculation circuit 102, inductive current mistake
Zero detection circuit 103 and duty ratio counting circuit 104 are integrated in same chip, and the peripheral circuit number and complexity of chip are big
It is big to reduce, when the chip is applied to LED drive circuit by user, make the debugging of LED drive circuit provided by the present embodiment
It is simplified, it is convenient for users to use.
Although the present invention has been disclosed in the preferred embodiments as above, however, it is not intended to limit the invention.It is any to be familiar with ability
The technical staff in domain, without departing from the scope of the technical proposal of the invention, all using in the methods and techniques of the disclosure above
Appearance makes many possible changes and modifications or equivalent example modified to equivalent change to technical solution of the present invention.Therefore,
Anything that does not depart from the technical scheme of the invention are made to the above embodiment any simple according to the technical essence of the invention
Modification, equivalent variations and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of active power factor correction controller IC characterized by comprising
First pin, second pin, third pin and the 4th pin；
Inductive current zero cross detection circuit, first input end are connected by the second pin with the grid of power switch tube
It connects, and is connected by the third pin with direct current supply voltage, to detect the electric current for flowing through inductance, and in the inductance
Electric current when being decreased to zero, generate comparison signal；
Export electric current counting circuit, including first switch tube, the first end of the first switch tube by first pin with
The first end of the power switch tube is connected；
Error calculation circuit, input terminal are connected by the 4th pin with filter circuit, and the filter circuit is to described
Output is to the error calculation circuit to generate compensation after the current feedback signal that output electric current counting circuit generates is filtered
Signal；Duty ratio counting circuit receives the thermal compensation signal and the comparison signal to generate pulse width modulating signal and touching
It signals, the pulse width modulating signal is exported to the output electric current counting circuit, to drive the power switch tube week
The turn-on and turn-off of phase property；The trigger signal is exported to the output electric current counting circuit, to control the output galvanometer
It calculates circuit and generates current feedback signal.
2. active power factor correction controller IC according to claim 1, which is characterized in that when the electric current of the inductance
When zero passage, and pulse width modulating signal be high level when, the trigger signal be high level.
3. active power factor correction controller IC according to claim 1, which is characterized in that the output electric current calculates
Circuit is when the electric current of the inductance reaches peak value, the voltage signal of the peak point current of output characterization power switch tube；Then root
According to the voltage signal and the trigger signal, current feedback signal is generated.
4. active power factor correction controller IC according to claim 3, which is characterized in that the error calculation circuit
The voltage feedback signal for characterizing the current feedback signal is received, is exported with to generate thermal compensation signal and calculates electricity to the duty ratio
Road.
5. active power factor correction controller IC according to claim 1, which is characterized in that
The source electrode of the power switch tube of the drain electrode and DC-DC converter of the first switch tube is connected, the first switch
The source electrode of pipe is grounded；
The grid of the first switch tube receives the pulse width modulating signal, described in the pulse width modulating signal control
The on and off of first switch tube, and then output is controlled to the voltage signal of the source electrode of the power switch tube, and then makes institute
State the periodic on and off of power switch tube.
6. active power factor correction controller IC according to claim 1, which is characterized in that the output electric current calculates
Circuit includes inductive current peak detection circuit and current feedback signal generation circuit,
The input terminal of the inductive current peak detection circuit is connected with the drain electrode of the first switch tube, output end and the electricity
The input terminal for flowing feedback signal generation circuit is connected, and whether the electric current for detecting the inductance of DC-DC converter reaches peak value,
And the electric current of the inductance in the DC-DC converter will characterize the voltage of the current peak of the inductance when reaching peak value
Signal is exported to the current feedback signal generation circuit；
The current feedback signal generation circuit receives the voltage signal of the current peak of the characterization inductance, and according to institute
The trigger signal of duty ratio counting circuit output is stated, to generate the current feedback signal.
7. active power factor correction controller IC according to claim 1, which is characterized in that the error calculation circuit
Including trsanscondutance amplifier and third capacitor；
The non-inverting input terminal of the trsanscondutance amplifier receives voltage reference signal, and inverting input terminal, which receives, characterizes the current feedback
The voltage feedback signal of signal, output end are connect with the first end of the third capacitor；
The second end of third capacitor is grounded, and the voltage signal of first end is as the thermal compensation signal.
8. active power factor correction controller IC according to claim 7, which is characterized in that the error calculation circuit
It further include third controllable switch,
The first end of the third controllable switch is connect with the output end of the trsanscondutance amplifier, and the of the third controllable switch
Two ends are connected with the first end of the third capacitor,
Wherein, the third controllable switch is controlled by the signal that a duty ratio is less than or equal to 0.05.
9. active power factor correction controller IC according to claim 1, which is characterized in that the inductive current zero passage
Detection circuit includes bias voltage source and third comparator；
The anode of the bias voltage source is as the first input end of the inductive current zero cross detection circuit and direct current supply electricity
Pressure is connected, and cathode is connected with the non-inverting input terminal of the third comparator；
The inverting input terminal of the third comparator as the inductive current zero cross detection circuit the second input terminal with it is described
The source electrode of power switch tube is connected, and output end exports the comparison signal to the duty ratio counting circuit.
10. a kind of LED drive circuit characterized by comprising described in DC-DC converter, any one of claim 1~9
Active power factor correction controller IC and filter circuit；
The DC-DC converter is used to drive the LED under the driving of the active power factor correction controller IC
The input voltage of dynamic circuit is converted, to generate output electric current；
The current feedback signal is converted to characterization for being filtered to the current feedback signal by the filter circuit
The voltage feedback signal of the current feedback signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610146219.1A CN105722274B (en) | 2013-12-18 | 2013-12-18 | Active power factor correction control circuit, chip and LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310701205.8A CN103648202B (en) | 2013-12-18 | 2013-12-18 | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit |
| CN201610146219.1A CN105722274B (en) | 2013-12-18 | 2013-12-18 | Active power factor correction control circuit, chip and LED drive circuit |
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| CN201310701205.8A Division CN103648202B (en) | 2013-12-18 | 2013-12-18 | Active power factor correction control circuit, chip and LED (Light Emitting Diode) drive circuit |
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| CN105722274A CN105722274A (en) | 2016-06-29 |
| CN105722274B true CN105722274B (en) | 2019-03-19 |
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| CN110049596B (en) * | 2019-04-28 | 2024-02-20 | 拓尔微电子股份有限公司 | Pulse input detection circuit for white light LED dimming |
| CN113541444B (en) * | 2020-04-15 | 2023-03-24 | 成都中启易联科技有限公司 | Current recovery circuit, switch converter and integrated circuit |
| CN113541458B (en) * | 2021-05-31 | 2023-02-10 | 广州金升阳科技有限公司 | Filter circuit |
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