CN105722274A - 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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- CN105722274A CN105722274A CN201610146219.1A CN201610146219A CN105722274A CN 105722274 A CN105722274 A CN 105722274A CN 201610146219 A CN201610146219 A CN 201610146219A CN 105722274 A CN105722274 A CN 105722274A
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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
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Abstract
The invention provides an APFC (active power factor correction) control circuit, which comprises an output current calculating circuit, an error calculation circuit, an inductive current zero-cross detection circuit and a duty ratio calculation circuit. The circuit provides a constant voltage to a gate of a power switch tube of a DC-DC converter by a DC supply voltage, and controls periodic conduction and cutoff of the power switch tube only by adjusting a source voltage of the power switch tube, so that the DC-DC converter is driven to work. Debugging when the APFC control circuit is utilized is relatively simple. In addition, the APFC control circuit can be directly integrated on the same chip; and the chip only comprises four pins, so that the number and the complexity level of peripheral circuits are reduced; and the problem of complicated debugging of an LED drive circuit when a PF value of the LED drive circuit is improved by the APFC control circuit is further solved.
Description
The application is Application No. 201310701205.8, filing date December in 2013 18 days, denomination of invention
Divisional application for " APFC control circuit, chip and LED drive circuit ".
Technical field
The present invention relates to electric and electronic technical field, more particularly, it relates to a kind of active power factor school
Positive control circuit, chip and LED drive circuit.
Background technology
LED (Light-Emitting Diode, light emitting diode) is relative to traditional electric filament lamp, daylight lamp
There is Deng luminescent device the advantages such as life-span length, green non-pollution, there is boundless application prospect.
LED, as illuminating product, needs to meet relevant harmonic standard, the most just requires LED drive circuit
PF (Power Factor, power factor) value higher.In order to improve PF value, PFC (Power to be used
Factor Correction, PFC).PFC is divided into PPFC (Passive Power Factor
Correction, PPFC) and APFC (Active Power Factor Correction, has
Active power factor correction).
The LED drive circuit using APFC specifically includes that DC-DC converter and APFC control circuit,
Wherein, DC-DC converter is connected with load LED.Drive in work process, AC-input voltage warp
After over commutation and filtering, being converted to DC input voitage, DC-DC converter is to this DC input voitage
Carry out voltage transformation, finally give the driving voltage needed for load LED, it is achieved the driving to LED.At this
During, APFC control circuit is by exporting PWM (Pulse Width to DC-DC converter
Modulation, pulse width modulation) signal, leading of the power switch pipe of control DC-DC converter
Lead to and cut-off, to improve the PF value of LED drive circuit.
But, in LED drive circuit, if using APFC to realize high PF value, APFC controls electricity
Road can be relatively easy.At present, most of APFC control circuits are integrated in the chips, realize driving LED
The preferable regulation of the DC-DC converter on galvanic electricity road, then the peripheral circuit of this chip is more and more complicated,
The debugging causing circuit is loaded down with trivial details.
Summary of the invention
The invention provides a kind of APFC control circuit, chip and LED drive circuit, to solve when using
When APFC control circuit improves the PF value of LED drive circuit, LED drive circuit operation is complicated, it is numerous to debug
Trivial problem.
For achieving the above object, the technical scheme is that
The present invention proposes a kind of APFC control circuit, in DC-DC converter,
Including: inductive current zero cross detection circuit, output Current calculation circuit, error calculation circuit and dutycycle
Counting circuit；
The source electrode of the power switch pipe of described inductive current zero cross detection circuit and described DC-DC converter
Connection is to receive the electric current of the inductance of described DC-DC converter, and the electric current at described inductance is decreased to zero
Time, produce comparison signal, and described comparison signal is exported to described dutycycle counting circuit；
Described dutycycle counting circuit receives described comparison signal and pulse width modulating signal, and produces accordingly
The raw signal that triggers exports to described output Current calculation circuit；
Described output Current calculation circuit is connected with the source electrode of the power switch pipe of described DC-DC converter
To receive the electric current of the inductance of described DC-DC converter, when the electric current of described inductance reaches peak value,
Output characterizes the voltage signal of the peak point current of power switch pipe；Then according to described voltage signal and described
Trigger signal, produce current feedback signal；
Described error calculation circuit receives the voltage feedback signal characterizing described current feedback signal, to produce
Compensate signal to export to described dutycycle counting circuit；
Described dutycycle counting circuit receives described compensation signal and described comparison signal, to produce described arteries and veins
Rushing bandwidth modulation signals, described pulse width modulating signal exports to described output Current calculation circuit, with
Drive the periodic turn-on and turn-off of described power switch pipe.
Preferably, described output Current calculation circuit also includes the first switching tube,
The drain electrode of described first switching tube and the source electrode phase of the power switch pipe of described DC-DC converter
Even, the source ground of described first switching tube；
The grid of described first switching tube receives described pulse width modulating signal, with according to described pulse width
Degree modulated signal proceeds to switch motion, thus drives the periodic turn-on and turn-off of described power switch pipe.
Preferably, described output Current calculation circuit includes inductive current peak testing circuit and current feedback
Signal generating circuit,
The input of described inductive current peak testing circuit is connected with the drain electrode of described first switching tube, defeated
Going out end to be connected with the input of described current feedback signal generation circuit, it detects described DC-dc conversion
Whether the electric current of the inductance of device reaches peak value, and reaches at the electric current of the inductance of described DC-DC converter
During peak value, the voltage signal characterizing the current peak of described inductance is exported and produces to described current feedback signal
Raw circuit；
Described current feedback signal produces the voltage letter that circuit receives the current peak of the described inductance of described sign
Number, and according to the triggering signal of described dutycycle counting circuit output, to produce described current feedback signal.
Preferably, described dutycycle counting circuit receives described compensation signal and described comparison signal, to produce
Raw described pulse width modulating signal,
Wherein, described comparison signal is in order to control the turn-on action of described power switch pipe, when described power
After switching tube conducting, described dutycycle counting circuit is according to power switch pipe described in described compensation signal control
Shutoff.
Preferably, described dutycycle counting circuit include the 4th comparator, current source, the 4th electric capacity,
Four gate-controlled switches, not gate and the first trigger,
First end of described 4th gate-controlled switch is connected with the first end of described 4th electric capacity, the second end and institute
The second end stating the 4th electric capacity is connected, the second end ground connection of described 4th electric capacity；
Described pulse width modulating signal controls opening of described 4th gate-controlled switch after described not gate processes
Pass action, described current source gives described 4th electric capacity charging；
The in-phase input end of the 4th comparator is connected with the first end of described 4th electric capacity, to receive the 4th electricity
The first terminal voltage held, inverting input receives described compensation signal, and outfan is connected to described second and touches
Send out the reset terminal of device；
Described comparison signal is input to the set end of described second trigger after pulse generator processes,
Described second trigger outfan exports described pulse width modulating signal.
Preferably, described dutycycle counting circuit includes the second trigger,
Described comparison signal is input to the reset terminal of described second trigger after pulse generator processes；
The set end of described second trigger receives described pulse width modulating signal, and outfan output is described
Trigger signal.
Preferably, described error calculation circuit includes trsanscondutance amplifier and the 3rd electric capacity；
The in-phase input end of described trsanscondutance amplifier receives voltage reference signal, and inverting input receives and characterizes
The voltage feedback signal of described current feedback signal, outfan is connected with the first end of described 3rd electric capacity；
Second end ground connection of the 3rd electric capacity, the voltage signal of its first end is as described compensation signal.
Preferably, described error calculation circuit also includes the 3rd gate-controlled switch,
Described first end of the 3rd gate-controlled switch is connected with the outfan of described trsanscondutance amplifier, and the described 3rd
Second end of gate-controlled switch is connected with the first end of described 3rd electric capacity,
Wherein, described 3rd gate-controlled switch is controlled by the dutycycle signal less than or equal to 0.05.
Preferably, described output Current calculation circuit also includes current mirroring circuit,
The first input end of described current mirror circuit is connected with the drain electrode of described first switching tube, and second is defeated
Entering end to be connected with the grid of described first switching tube, described current mirror circuit is for flowing through described first
The current mirror of switching tube amplifies, and obtains image current；
Described image current characterizes the current value that described first switching tube sampling obtains, and current mirror circuit will
Described image current exports to described inductive current peak testing circuit.
Preferably, described inductive current zero cross detection circuit includes: bias voltage source and the 3rd comparator；
The positive pole of described bias voltage source as described inductive current zero cross detection circuit first input end with
Direct current supply voltage is connected, and negative pole is connected with the in-phase input end of described 3rd comparator；
The inverting input of described 3rd comparator is second defeated as described inductive current zero cross detection circuit
Entering end to be connected with the source electrode of described power switch pipe, outfan exports described comparison signal to described dutycycle
Counting circuit.
Preferably, described APFC control circuit also includes the first resistance,
One end of described first resistance is connected with the grid of described power switch pipe, the other end and described direct current
Supply voltage is connected.
The invention allows for a kind of active power factor correction controller IC, including above-mentioned active power
Factor correcting control circuit, the first pin, the second pin, the 3rd pin and the 4th pin；
The input of the output Current calculation circuit of described APFC control circuit and described have
Second input of the inductive current zero cross detection circuit of active power factor correction control circuit is by described the
One pin is connected with the source electrode of the power switch pipe of DC-DC converter；
The first input end of the inductive current zero cross detection circuit of described APFC control circuit
It is connected with the grid of described power switch pipe by described second pin；
The first input end of the inductive current zero cross detection circuit of described APFC control circuit
It is connected with direct current supply voltage by described 3rd pin；
The input of the error calculation circuit of described APFC control circuit passes through the described 4th
Pin is connected with filter circuit.
The invention allows for a kind of LED drive circuit, including: DC-DC converter, above-mentioned having
Active power factor correction control circuit and filter circuit；
Described DC-DC converter is for right under the driving of described APFC control circuit
The input voltage of described LED drive circuit converts, and obtains the DC voltage that described LED needs；
Described filter circuit is for the output Current calculation electricity to described APFC control circuit
The current feedback signal that road produces is filtered, to be converted to characterize described electricity by described current feedback signal
The voltage feedback signal of stream feedback signal.
Compared with prior art, technical scheme provided by the present invention at least has the advantage that
In APFC control circuit provided by the present invention, chip and LED drive circuit, APFC controls
Circuit includes exporting Current calculation circuit, error calculation circuit, inductive current zero cross detection circuit and duty
Ratio counting circuit, uses the grid of the power switch pipe that direct current supply voltage is DC-DC converter to provide
Constant voltage, is only driven the source electrode of power switch pipe, can be achieved with power switch by control circuit
The adjustment of pipe source voltage, and then control the change of power switch pipe gate source voltage, make power switch pipe send out
Raw periodically conducting and cut-off, to drive DC-DC converter to work.Above-mentioned only change source voltage
The mode being driven, is driven relative to the voltage adjusting grid and source electrode in prior art simultaneously
Mode, makes debugging during this APFC control circuit of application simpler.
It addition, above-mentioned APFC control circuit can be directly integrated on the same chip, the APFC formed
The number of pins of control chip is only 4, thus reduces number and the complexity of peripheral circuit, enters
Solving when the PF value using APFC control circuit to improve LED drive circuit of one step, LED drives
The problem that dynamic circuit debugging is loaded down with trivial details.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structure chart of the APFC control circuit that Fig. 1 is provided by the embodiment of the present invention one；
The structure chart of the APFC control circuit that Fig. 2 is provided by the embodiment of the present invention two；
The structure chart of the APFC control circuit that Fig. 3 is provided by the embodiment of the present invention three；
The structure chart of the APFC control circuit that Fig. 4 is provided by the embodiment of the present invention four；
The structure chart of the APFC control chip that Fig. 5 is provided by the embodiment of the present invention five；
The structure chart of the LED drive circuit that Fig. 6 is provided by the embodiment of the present invention six.
Detailed description of the invention
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from
The detailed description of the invention of the present invention is described in detail.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but this
Bright other can also be used to be different from alternate manner described here implement, those skilled in the art are permissible
In the case of intension of the present invention, doing similar popularization, therefore the present invention not by following public specifically
The restriction of embodiment.
Embodiment one
Present embodiments providing a kind of APFC control circuit, this control circuit is used for driving DC-to-dc to become
Parallel operation works, to improve the power factor value of DC-DC converter.The structure of this control circuit such as Fig. 1
Shown in, in figure, 10 is APFC control circuit, and 11 is DC-DC converter, APFC control circuit
10 include: output Current calculation circuit 101, error calculation circuit 102, inductive current zero cross detection circuit
103 and dutycycle counting circuit 104.
The first input end of output Current calculation circuit 101 exports with the first of dutycycle counting circuit 104
End is connected, and the second input is connected with the second outfan of dutycycle counting circuit 104, the 3rd input
Power switch pipe Q with DC-DC converter 11bSource electrode be connected, outfan and error calculation circuit
The input of 102 is connected；The outfan of error calculation circuit 102 and the first of dutycycle counting circuit 104
Input is connected；The first input end of inductive current zero cross detection circuit 103 respectively with direct current supply voltage
VCCWith power switch pipe QbGrid be connected, the second input and power switch pipe QbSource electrode be connected,
Outfan is connected with the second input of dutycycle counting circuit 104.
In above-mentioned APFC control circuit 10, output Current calculation circuit 101 flows through inductance L by samplingb
Electric current, obtain flowing through inductance LbThe situation of change of electric current, flowing through inductance LbElectric current reach peak value
Time, produce a current feedback signal IFB；Error calculation circuit 102 obtains and characterizes this current feedback signal IFB
Voltage feedback signal, response dutycycle counting circuit 104 output triggering signal, with produce compensate letter
Number, and this compensation signal is exported to dutycycle counting circuit 104；Inductive current zero cross detection circuit 103
Inductance L is flow through in detectionbElectric current, flowing through inductance LbElectric current when being decreased to zero, produce comparison signal,
And this comparison signal is exported to dutycycle counting circuit 104；Dutycycle counting circuit 104 receives and compensates letter
Number and comparison signal, with produce pulse width modulating signal PWM and trigger signal TDIS, and by pulse width
Degree modulated signal PWM exports to output Current calculation circuit 101, to drive power switch pipe QbCycle
Property turn-on and turn-off, will trigger signal TDISOutput Current calculation circuit 101 is given in output, to control output
Current calculation circuit 101 produces current feedback signal IFB。
In the present embodiment, the power switch pipe Q of DC-DC converter 11bGrid and direct current supply electricity
Pressure VCCBe connected, i.e. direct current supply voltage VCCFor power switch pipe QbProvide a bias voltage, power
Switching tube QbGrid voltage invariable.Power switch pipe QbSource electrode with output Current calculation circuit
3rd input of 101 is connected, when the voltage of the 3rd input of output Current calculation circuit 101 becomes
During change, power switch pipe QbSource voltage change the most therewith, thus power switch pipe QbGrid source electricity
Buckling, makes power switch pipe QbOn or off.Visible, the APFC that the present embodiment is provided controls
Circuit 10 is to drive power switch pipe Q by the way of using source drivebWork, and existing skill
Art could be adjusted to drive power to open generally by the grid of power switch pipe and source voltage simultaneously
Closing pipe work, therefore the APFC control circuit 10 in the present embodiment is simpler than of the prior art, from
And debugging in use is the most just simplified.
It addition, DC-DC converter 11 specifically includes that power switch pipe QbWith inductance Lb, also may be used
To include: electric capacity CbWith diode Db, electric capacity CbWith inductance L after in parallel with load LEDbIn series
One branch road, diode DbIt is connected in parallel on electric capacity Cb, load LED and inductance LbThe branch road two ends constituted,
Input voltage vgTo electric capacity Cb, load LED and inductance LbThe branch road constituted provides DC voltage, logical
Overpower switching tube QbConducting and cut-off control foregoing circuit to input voltage vgCarry out converting (blood pressure lowering
Or boosting etc.).
Embodiment two
Based on embodiment one, present embodiments provide a kind of APFC control circuit 10, as in figure 2 it is shown,
This circuit exports Current calculation circuit 101 include: the first switching tube M1, inductive current peak detection electricity
Road 1011 and current feedback signal produce circuit 1012.
First switching tube M1Grid as described output Current calculation circuit 101 first input end with account for
Empty the first outfan than counting circuit 104 is connected, and drain electrode is as exporting the of Current calculation circuit 101
Three inputs and the power switch pipe Q of DC-DC converter 11bSource electrode be connected, source ground；Electricity
The input of inducing current peak detection circuit 1011 and the first switching tube M1Drain electrode be connected, outfan with
Current feedback signal produces the input of circuit 1012 and is connected；Current feedback signal produces circuit 1012
Outfan is as the input phase of the outfan with error calculation circuit 102 exporting Current calculation circuit 101
Even.
First switching tube M1The inductance L of DC-DC converter 11 is flow through in samplingbElectric current, therefore flow through
First switching tube M1Electric current equal to flowing through power switch pipe QbElectric current；Inductive current peak detection electricity
Road 1011 by with power switch pipe QbSource electrode (the i.e. first switching tube M1Drain electrode) be connected, obtain
Characterize the first switching tube M1The voltage signal of the current value that sampling obtains, detects DC-DC converter 11
Inductance LbElectric current whether reach peak value, at inductance LbElectric current when reaching peak value, inductance will be characterized
LbThe voltage signal of current peak export and produce circuit 1012 to current feedback signal；Current feedback signal
Produce circuit 1012 and receive this sign inductance LbThe voltage signal of current peak, triggering signal TDIS
Effect under produce current feedback signal IFB。
In the present embodiment, the pulse width modulating signal PWM produced by dutycycle counting circuit 104 is controlled
Make the first switching tube M1Conducting and cut-off, and then control output to power switch pipe QbThe electricity of source electrode
Pressure signal, and then make power switch pipe QbPeriodically on or off.
It should be noted that the above-mentioned way of realization exporting Current calculation circuit that the present embodiment is provided is only
For the one of this circuit implementation in the present invention, in other embodiments of the invention, export galvanometer
Calculating circuit 101 can also use other circuit and annexation to realize.
It addition, the first switching tube M in the present embodiment1Type can be N-type, it is also possible to for p-type,
This does not limit.
Can also be preferably at power switch pipe Q in the present embodimentbGrid and direct current supply voltage VCCIt
Between set up one first resistance R1, this first resistance R1One end and power switch pipe QbGrid be connected,
The other end and direct current supply voltage VCCIt is connected, with preferably for power switch pipe QbGrid provide constant
Bias voltage.
Embodiment three
Based on embodiment two, present embodiments provide a kind of APFC control circuit 10 implements circuit,
The structure of this circuit is as shown in Figure 3:
The inductive current peak testing circuit 1011 of output Current calculation circuit 101 comprises the steps that first is controlled
Switch S1, the second gate-controlled switch S2, the first electric capacity C1With the second electric capacity C2.First gate-controlled switch S1's
First end is as the input of inductive current peak testing circuit 1011 and the first switching tube M1Drain electrode phase
Even, the second end and the first electric capacity C1The first end be connected；First electric capacity C1The second end ground connection；Second can
Control switch S2The first end and the first electric capacity C1The first end be connected, the second end and the second electric capacity C2?
One end is connected；Second electric capacity C2The first end as inductive current peak testing circuit 1011 outfan with
Current feedback signal produces the input of circuit 1012 and is connected, the second end ground connection.
In foregoing circuit, the first gate-controlled switch S1It is controlled by the pulse width that dutycycle counting circuit 102 produces
Degree modulated signal PWM, i.e. power switch pipe QbThe time of conducting, at this pulse width modulating signal PWM
Control under on or off；Second gate-controlled switch S2It is controlled by power switch pipe QbTurn-off time TOFF,
With the first gate-controlled switch S1Complementary conducting, the i.e. first gate-controlled switch S1With the second gate-controlled switch S2Shutoff time
Carve complementary with turn-on instant.Owing to flowing through the first switching tube M1Electric current equal to flowing through inductance LbElectric current,
Therefore when flowing through the first switching tube M1Electric current when reaching peak value, pulse width modulating signal PWM is always
Remain high level, the first gate-controlled switch S1Open-minded, then the first electric capacity C1Voltage be that sign flows through power
Switching tube QbThe voltage signal of peak point current, thus the first electric capacity C1Sampling obtains characterizing power switch pipe
QbThe voltage signal of peak point current.Now pulse width modulating signal PWM becomes low level, and first
Gate-controlled switch S1Turn off, characterize power switch pipe QbTurn-off time TOFFSignal be high level,
Two gate-controlled switch S2Open-minded, then the second electric capacity C2Voltage equal to characterize power switch pipe QbPeak electricity
The voltage signal of stream, by this power switch pipe QbThe voltage signal of peak point current export and believe to current feedback
Number produce circuit 1012.
The current feedback signal of output Current calculation circuit 101 produces circuit 1012 and comprises the steps that second switch
Pipe M2, the 3rd switching tube M3, the 4th switching tube M4, the 5th switching tube M5, the first comparator A1With
Second resistance R2.Second switch pipe M2Grid and the 3rd switching tube M3Grid be connected, second switch
Pipe M2Grid also with second switch pipe M2Drain electrode be connected, second switch pipe M2Source electrode and the 3rd open
Close pipe M3Source electrode all with direct current supply voltage VCCIt is connected, second switch pipe M2Drain electrode open with the 4th
Close pipe M4Drain electrode be connected, the 3rd switching tube M3Drain electrode and the 5th switching tube M5Drain electrode be connected；The
Four switching tube M4Grid calculate electricity as the second input and the dutycycle of output Current calculation circuit 101
Second outfan on road 104 is connected, and source electrode is as outfan and the error exporting Current calculation circuit 101
The input of counting circuit 102 is connected；5th switching tube M5Grid and the first comparator A1Output
End be connected, source electrode respectively with the first comparator A1Inverting input and the second resistance R2The first end phase
Even；First comparator A1In-phase input end as current feedback signal produce circuit 1012 input
With the second electric capacity C2The first end be connected；Second resistance R2The second end ground connection.
In foregoing circuit, the first comparator A1Receive and characterize power switch pipe QbThe voltage of peak point current
Signal, with the second resistance R2Voltage signal compare, export the second comparison signal to control the 5th to open
Close pipe M5Conducting, and then control the 3rd switching tube M3Open, due to second switch pipe M2With the 3rd switch
Pipe M3It is mirrored into relation, therefore second switch pipe M2Open, the 4th switching tube M simultaneously4At dutycycle meter
Calculate the triggering signal T that circuit 104 producesDISControl under, produce current feedback signal IFB。
Error calculation circuit 102 comprises the steps that trsanscondutance amplifier Gm, the 3rd gate-controlled switch S3With the 3rd electric capacity
C3.Trsanscondutance amplifier GmIn-phase input end receive voltage reference signal vREF, inverting input is as by mistake
The input of difference counting circuit 102 and the 4th switching tube M4Source electrode be connected, outfan and the 3rd controlled leaves
Close S3The first end be connected；3rd gate-controlled switch S3The second end and the 3rd electric capacity C3The first end be connected；
3rd electric capacity C3The second end ground connection.
In foregoing circuit, the 3rd gate-controlled switch S3, it is controlled by the dutycycle pulse less than or equal to 0.05
Signal Dc.Current feedback signal IFBCorresponding voltage feedback signal VFB(i.e. characterize described current feedback letter
Number IFBVoltage feedback signal) with reference voltage signal vREFInput to trsanscondutance amplifier G respectivelym, across
Lead amplifier GmTo voltage feedback signal VFBWith reference voltage signal vREFCarry out computing, obtain voltage anti-
Feedback signal VFBRelative to reference voltage signal vREFError.3rd gate-controlled switch S3It is controlled by pulse letter
Number DcAnd turn-on and turn-off, as the 3rd gate-controlled switch S3During conducting, the 3rd electric capacity C3Charging, then the 3rd
Electric capacity C3The voltage of the first end be vc, as the 3rd gate-controlled switch S3During shutoff, the 3rd electric capacity C3Electricity
Pressure vcIt is held essentially constant, thus produces a compensation signal and export to dutycycle counting circuit 104, this benefit
Repay characterization voltage feedback signal VFBRelative to reference voltage signal vREFError amount.
If it should be noted that pulse signal DcDutycycle equal to 0.5, the 3rd electric capacity C3Capacitance etc.
In 1, then when dutycycle is equal to 0.05, the 3rd electric capacity C3Capacitance be equal to 0.1；Can if being not provided with the 3rd
Control switch S3, then it is believed that dutycycle is equal to 1, then capacitance is equal to 2, by arranging the 3rd gate-controlled switch
S3, and make its pulse signal D of controlcDutycycle Dc≤0.05, capacitance can be made to be less than or equal to 0.1.
Foregoing circuit arranges one the 3rd gate-controlled switch S3, reduce the 3rd electric capacity C3Capacitance, due to electric capacity
Capacitance is directly proportional to the volume of himself, therefore the 3rd electric capacity C3Can be integrated in chip, thus decrease
The number of pins of chip and peripheral circuit.
Inductive current zero cross detection circuit 103 includes: bias voltage source VOSWith the 3rd comparator A3.Partially
Put voltage source VOSPositive pole supply as first input end and the direct current of inductive current zero cross detection circuit 103
Piezoelectric voltage VCCIt is connected, negative pole and the 3rd comparator A3In-phase input end be connected；3rd comparator A3
Inverting input as inductive current zero cross detection circuit 103 the second input with output Current calculation
3rd input of circuit 101 is connected, and outfan is as the output of inductive current zero cross detection circuit 103
End is connected with the second input of dutycycle counting circuit 104.
In foregoing circuit, inductance L is flow through in inductive current zero cross detection circuit 103 detectionbElectric current, at electricity
Sense LbCurrent over-zero time, the 3rd comparator A3Output high level, this high level is defeated as comparison signal
Go out to dutycycle counting circuit 104.
Dutycycle counting circuit 104 includes: the first trigger RS1, the second trigger RS2, pulse generation
Device the 1041, the 4th comparator A4, current source Is, the 4th electric capacity C4, the 4th gate-controlled switch S4And not gate
1042；First trigger RS1Set end S as dutycycle counting circuit 104 the second input with
3rd comparator A3Outfan be connected, reset terminal R and the 4th comparator A4Outfan be connected, defeated
The input going out to hold Q NAND gate 1042 is connected, and as the first outfan of dutycycle counting circuit 104
With the first switching tube M1Grid be connected；4th comparator A4In-phase input end and the 4th electric capacity C4's
First end is connected, and inverting input is as the first input end of dutycycle counting circuit 104 and the 3rd electric capacity
C3The first end be connected；Current source IsNegative pole and the 4th electric capacity C4The first end be connected；4th electric capacity
C4The second end ground connection；4th gate-controlled switch S4The first end and the 4th electric capacity C4The first end be connected, the
Two ends and the 4th electric capacity C4The second end be connected, the 4th gate-controlled switch S4It is controlled by the output of not gate 1042
Signal；First end of pulse generator 1041 and the first trigger RS1Set end S-phase even, the second end
With the second trigger RS2Reset terminal R be connected；Second trigger RS2Set end S NAND gate 1042
Input be connected, outfan Q as dutycycle counting circuit 104 the second outfan with the 4th switch
Pipe M4Grid be connected.
In foregoing circuit, when flowing through inductance LbCurrent over-zero time, the 3rd comparator A3Output high level letter
Number (i.e. comparison signal), after pulse generator 1041 processes, the first trigger RS1Set end S
Receive this high level signal, then the first trigger RS1Outfan Q end output pulse width modulation letter
Number PWM is high level, the first switching tube M1Open-minded, then power switch pipe QbOpen-minded；It is high simultaneously
The pulse width modulating signal PWM of level becomes low level after not gate 1042 so that current source Is
To the 4th electric capacity C4Charging；As the 4th electric capacity C4The voltage at two ends reaches the 3rd electric capacity C3The voltage at two ends
Time, the 4th comparator A4Output high level gives the first trigger RS1Reset terminal R, then the first trigger
RS1Outfan Q output pulse width modulating signal PWM be low level, the first switching tube M1Close
Disconnected, then power switch pipe QbTurn off, to the first switching tube M1The most open-minded, a switch periods (i.e. merit
Rate switching tube QbDrive cycle) end-of-job, start the work of next switch periods.Visible, this
The APFC control circuit 10 that embodiment is provided drives power switch pipe QbConstant period, power is opened
Close pipe QbService time is constant, thus the debugging of simple APFC control circuit 10 and operation.
While above-mentioned dutycycle counting circuit produces pulse width modulating signal PWM, when flowing through inductance
LbCurrent over-zero time, the 3rd comparator A3The high level of output, after pulse generator processes, quilt
Second trigger RS2Reset terminal R receive, and set end S receive pulse-width signal PWM also
For high level, then the second trigger RS2Outfan Q output triggering signal TDISFor high level, this
Time the 4th switching tube M4Conducting, flows through inductance L simultaneouslybElectric current continued to be reduced to negative value by zero, then
Four switching tube M4After conducting, force the inductance L come by mirror imagebFailure of current so that the electricity of output
Stream feedback signal is zero.
The APFC control circuit that the present embodiment is provided drives power switch pipe QbConstant period, thus
Make power switch pipe QbService time constant, make this circuit be applied to improve DC-DC converter merit
During rate factor value, debugging is simplified.
Further, by setting up a gate-controlled switch in error calculation circuit in the present embodiment, and this is made
Gate-controlled switch is controlled by the pulse signal that a dutycycle is not more than 0.05, makes the capacitance of electric capacity to subtract accordingly
Little, thus electric capacity can integrated with APFC control circuit on the same chip, decrease the pin of chip
Number and peripheral circuit number, further simplify debugging during control circuit application.
Embodiment four
The present embodiment is the precision further improving APFC control circuit, detects at inductive current peak
Circuit and the first switching tube M1Between set up a current mirror circuit.This current mirror circuit and other circuit
Between annexation as shown in Figure 4, the first input end of current mirror circuit 1013 and the first switching tube
M1Drain electrode be connected, the second input and the first switching tube M1Grid be connected, outfan and inductance electricity
The first input end of stream peak detection circuit 1011 is connected, and constitutes inductive current peak testing circuit 1011
First input end by this current mirror circuit 1013 and the first switching tube M1Drain electrode be indirectly connected to
Structure.
This current mirror circuit 1013 is for flowing through the first switching tube M1Current mirror amplify, obtain
Image current, therefore this image current can characterize the first switching tube M equally1The current value that sampling obtains, i.e.
Can characterize and flow through inductance LbElectric current；The image current that this is amplified by current mirror circuit 1013 through mirror image
Export to inductive current peak testing circuit 1011, owing to this image current characterizes inductance LbElectric current, because of
This inductive current peak testing circuit 1011 can obtain inductance L by detecting this image currentbElectric current when
Reach peak value, and owing to this image current is inductance LbElectric current amplified obtain, the precision therefore detected
Can be higher than when there is no a current mirror circuit 1013, and then enable whole APFC control circuit more preferable
Improve power factor value.
Concrete, this current mirror circuit 1013 comprises the steps that the 6th switching tube M6, the 7th switching tube M7、
8th switching tube M8, the 9th switching tube M9, the second comparator A2With the 3rd resistance R3；6th switching tube
M6Grid and the 7th switching tube M7Grid be connected, the 6th switching tube M6Grid also with the 6th switch
Pipe M6Drain electrode be connected, the 6th switching tube M6Source electrode and the 7th switching tube M7Source electrode all with direct current supply
Piezoelectric voltage VCCIt is connected, the 6th switching tube M6Drain electrode and the 8th switching tube M8Drain electrode be connected, the 7th
Switching tube M7Drain electrode and the 3rd resistance R3The first end be connected, the 7th switching tube M7Drain electrode also conduct
The outfan of current mirror circuit 1013 and the first gate-controlled switch S1The first end be connected, the 6th switching tube
M6With the 7th switching tube M7It is mirrored into relation；8th switching tube M8Grid and the second comparator A2's
Outfan be connected, source electrode respectively with the second comparator A2Inverting input and the 9th switching tube M9Leakage
The most connected；9th switching tube M9Grid as second input and first of current mirror circuit 1013
Switching tube M1Grid be connected, source ground, the 9th switching tube M9With the first switching tube M1It is mirrored into closing
System；Second comparator A2In-phase input end as the first input end and of current mirror circuit 1013
One switching tube M1Drain electrode be connected；3rd resistance R3The second end ground connection.
In foregoing circuit, flow through the first switching tube M if arranging1With the 9th switching tube M9Current ratio be
K:1, i.e. flows through the electric current of current mirror circuit 1013 equal to flowing through the first switching tube M1The 1/K of electric current
Times, and flow through the first switching tube M1Electric current equal to flowing through inductance LbElectric current, therefore flow through current mirror
As the electric current of circuit 1013 is equal to flowing through inductance Lb1/K times of electric current.If K is less than 1, then current mirror
Inductance L is flow through as what sampling was obtained by circuit 1013bCurrent amplifier 1/K times, by this through that amplification,
Characterize inductance LbThe signal of electric current export to inductive current peak testing circuit 1011, inductance electricity can be made
Stream peak detection circuit 1011 is to inductance LbPeak point current more sensitive, thus improve peak point current
The precision of detection.
The present embodiment preferably can be by the 3rd resistance R3With the second resistance R2Proportional setting, thus without right
The actual value of resistance is adjusted, and only by adjusting the ratio relation of the two, can change current mirror electricity
The multiple of electric current is amplified on road 1013, reduces the 3rd resistance R3With the second resistance R2The requirement of precision.
Embodiment five
Present embodiments provide a kind of APFC control chip, as it is shown in figure 5, this APFC control chip
50 include: the APFC control circuit described in embodiment one～embodiment four, the first pin T1, second draw
Foot T2, the 3rd pin T3With the 4th pin T4；The output Current calculation circuit 101 of APFC control circuit
The 3rd input by the first pin T1Power switch pipe Q with DC-DC converter 11bSource electrode
It is connected；The first input end of the inductive current zero cross detection circuit 103 of APFC control circuit draws by second
Foot T2With power switch pipe QbGrid be connected；The inductive current zero cross detection circuit of APFC control circuit
The first input end of 103 passes through the 3rd pin T3With direct current supply voltage VCCIt is connected；APFC control circuit
The input of error calculation circuit 102 by the 4th pin T4It is connected with filter circuit 51.
The APFC control chip that the present embodiment is provided directly will output Current calculation circuit 101, error meter
Calculate circuit 102, inductive current zero cross detection circuit 103 and dutycycle counting circuit 104 and be integrated in same core
On sheet, the number of pins of chip is only 4, thus reduces number and the complexity of peripheral circuit, makes
When application APFC control chip improves power factor value, the debugging to circuit is simplified.
Embodiment six
Present embodiments providing a kind of LED drive circuit, as shown in Figure 6, this LED drive circuit includes:
DC-DC converter 11, embodiment one～the APFC control circuit described in embodiment four and filter circuit
51；Wherein, DC-DC converter 11 is for driving LED under the driving of APFC control circuit
The input voltage v of circuitgConvert, obtain loading the DC voltage that LED needs；Filter circuit 51
The current feedback signal produced for APFC control circuit exports Current calculation circuit 101 is filtered
Ripple, to be converted to characterize the voltage feedback signal of this current feedback signal by current feedback signal.
In above-mentioned LED drive circuit, AC-input voltage vinThrough rectification circuit (with bridge in the present embodiment
Illustrate as a example by formula rectification circuit) rectification and electric capacity CinFiltering after, become the input voltage of direct current
vg, then utilize DC-DC converter 11 under the driving of APFC control circuit, to this input voltage
vgCarry out voltage transformation, obtain loading the operating current of LED, make load LED luminous.
APFC control circuit drives the process of DC-DC converter 11 to have the most in the above-described embodiments in detail
Description, do not repeat them here.It is pointed out that and produce electric current at output Current calculation circuit 101
Feedback signal IFBBefore output is to error calculation circuit 102, need to utilize filter circuit 51 anti-to electric current
Feedback signal IFBIt is filtered, current feedback signal is transformed to voltage feedback signal.
In the present embodiment, described DC-DC converter 11 comprises the steps that inductance LbWith power switch pipe Qb,
Inductance LbThe first end be connected with the negative electrode of load LED, the second end and power switch pipe QbDrain electrode phase
Even.
It addition, described filter circuit 51 comprises the steps that the 4th resistance R4With the 5th electric capacity C5；4th resistance
R4With the 5th electric capacity C5Parallel connection, the 4th resistance R4The first end by the 4th pin T4With APFC control
The input of the error calculation circuit 102 of circuit is connected, the second end ground connection.
The LED drive circuit that the present embodiment is provided, uses APFC control circuit to improve DC-to-dc and becomes
The power factor value of parallel operation 11, APFC control circuit is opened by making the power of DC-DC converter 11
Close pipe QbGrid voltage constant, only drive power switch pipe QbThe method of source electrode, drive power to open
Close pipe QbIt is switched on and off, makes power switch pipe QbService time constant, this driving side makes APFC
The debugging of control circuit is simplified greatly.
And the present embodiment further can will export Current calculation circuit 101, error calculation circuit 102, electricity
Inducing current zero cross detection circuit 103 and dutycycle counting circuit 104 are integrated in same chip, chip
Peripheral circuit number and complexity are greatly reduced, when user by this chip application in LED drive circuit time,
The debugging making the LED drive circuit that the present embodiment provided is simplified, convenient for users to use.
Although the present invention discloses as above with preferred embodiment, but is not limited to the present invention.Any
Those of ordinary skill in the art, without departing under technical solution of the present invention ambit, may utilize
Technical solution of the present invention is made many possible variations and modification by method and the technology contents of stating announcement, or
It is revised as the Equivalent embodiments of equivalent variations.Therefore, every content without departing from technical solution of the present invention,
According to the technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification,
All still fall within the range of technical solution of the present invention protection.
Claims (13)
1. an APFC control circuit, in DC-DC converter, its feature exists
In, including: inductive current zero cross detection circuit, output Current calculation circuit, error calculation circuit with account for
Sky compares counting circuit；
The source electrode of the power switch pipe of described inductive current zero cross detection circuit and described DC-DC converter
Connection is to receive the electric current of the inductance of described DC-DC converter, and the electric current at described inductance is decreased to zero
Time, produce comparison signal, and described comparison signal is exported to described dutycycle counting circuit；
Described dutycycle counting circuit receives described comparison signal and pulse width modulating signal, and produces accordingly
The raw signal that triggers exports to described output Current calculation circuit；
Described output Current calculation circuit is connected with the source electrode of the power switch pipe of described DC-DC converter
To receive the electric current of the inductance of described DC-DC converter, when the electric current of described inductance reaches peak value,
Output characterizes the voltage signal of the peak point current of power switch pipe；Then according to described voltage signal and described
Trigger signal, produce current feedback signal；
Described error calculation circuit receives the voltage feedback signal characterizing described current feedback signal, to produce
Compensate signal to export to described dutycycle counting circuit；
Described dutycycle counting circuit receives described compensation signal and described comparison signal, to produce described arteries and veins
Rushing bandwidth modulation signals, described pulse width modulating signal exports to described output Current calculation circuit, with
Drive the periodic turn-on and turn-off of described power switch pipe.
APFC control circuit the most according to claim 1, it is characterised in that institute
State output Current calculation circuit and also include the first switching tube,
The drain electrode of described first switching tube and the source electrode phase of the power switch pipe of described DC-DC converter
Even, the source ground of described first switching tube；
The grid of described first switching tube receives described pulse width modulating signal, with according to described pulse width
Degree modulated signal proceeds to switch motion, thus drives the periodic turn-on and turn-off of described power switch pipe.
APFC control circuit the most according to claim 1, it is characterised in that institute
State output Current calculation circuit and include that inductive current peak testing circuit and current feedback signal produce circuit,
The input of described inductive current peak testing circuit is connected with the drain electrode of described first switching tube, defeated
Going out end to be connected with the input of described current feedback signal generation circuit, it detects described DC-dc conversion
Whether the electric current of the inductance of device reaches peak value, and reaches at the electric current of the inductance of described DC-DC converter
During peak value, the voltage signal characterizing the current peak of described inductance is exported and produces to described current feedback signal
Raw circuit；
Described current feedback signal produces the voltage letter that circuit receives the current peak of the described inductance of described sign
Number, and according to the triggering signal of described dutycycle counting circuit output, to produce described current feedback signal.
APFC control circuit the most according to claim 1, it is characterised in that institute
State dutycycle counting circuit and receive described compensation signal and described comparison signal, to produce described pulse width
Modulated signal,
Wherein, described comparison signal is in order to control the turn-on action of described power switch pipe, when described power
After switching tube conducting, described dutycycle counting circuit is according to power switch pipe described in described compensation signal control
Shutoff.
APFC control circuit the most according to claim 4, it is characterised in that institute
State dutycycle counting circuit and include the 4th comparator, current source, the 4th electric capacity, the 4th gate-controlled switch, non-
Door and the first trigger,
First end of described 4th gate-controlled switch is connected with the first end of described 4th electric capacity, the second end and institute
The second end stating the 4th electric capacity is connected, the second end ground connection of described 4th electric capacity；
Described pulse width modulating signal controls opening of described 4th gate-controlled switch after described not gate processes
Pass action, described current source gives described 4th electric capacity charging；
The in-phase input end of the 4th comparator is connected with the first end of described 4th electric capacity, to receive the 4th electricity
The first terminal voltage held, inverting input receives described compensation signal, and outfan is connected to described second and touches
Send out the reset terminal of device；
Described comparison signal is input to the set end of described second trigger after pulse generator processes,
Described second trigger outfan exports described pulse width modulating signal.
APFC control circuit the most according to claim 1, it is characterised in that institute
State dutycycle counting circuit and include the second trigger,
Described comparison signal is input to the reset terminal of described second trigger after pulse generator processes；
The set end of described second trigger receives described pulse width modulating signal, and outfan output is described
Trigger signal.
APFC control circuit the most according to claim 1, it is characterised in that institute
State error calculation circuit and include trsanscondutance amplifier and the 3rd electric capacity；
The in-phase input end of described trsanscondutance amplifier receives voltage reference signal, and inverting input receives and characterizes
The voltage feedback signal of described current feedback signal, outfan is connected with the first end of described 3rd electric capacity；
Second end ground connection of the 3rd electric capacity, the voltage signal of its first end is as described compensation signal.
APFC control circuit the most according to claim 7, it is characterised in that institute
State error calculation circuit and also include the 3rd gate-controlled switch,
Described first end of the 3rd gate-controlled switch is connected with the outfan of described trsanscondutance amplifier, and the described 3rd
Second end of gate-controlled switch is connected with the first end of described 3rd electric capacity,
Wherein, described 3rd gate-controlled switch is controlled by the dutycycle signal less than or equal to 0.05.
9. according to the APFC control circuit described in Claims 2 or 3, it is characterised in that
Described output Current calculation circuit also includes current mirroring circuit,
The first input end of described current mirror circuit is connected with the drain electrode of described first switching tube, and second is defeated
Entering end to be connected with the grid of described first switching tube, described current mirror circuit is for flowing through described first
The current mirror of switching tube amplifies, and obtains image current；
Described image current characterizes the current value that described first switching tube sampling obtains, and current mirror circuit will
Described image current exports to described inductive current peak testing circuit.
APFC control circuit the most according to claim 1, it is characterised in that
Described inductive current zero cross detection circuit includes bias voltage source and the 3rd comparator；
The positive pole of described bias voltage source as described inductive current zero cross detection circuit first input end with
Direct current supply voltage is connected, and negative pole is connected with the in-phase input end of described 3rd comparator；
The inverting input of described 3rd comparator is second defeated as described inductive current zero cross detection circuit
Entering end to be connected with the source electrode of described power switch pipe, outfan exports described comparison signal to described dutycycle
Counting circuit.
11. APFC control circuits according to claim 10, it is characterised in that
Described APFC control circuit also includes the first resistance,
One end of described first resistance is connected with the grid of described power switch pipe, the other end and described direct current
Supply voltage is connected.
12. 1 kinds of active power factor correction controller ICs, it is characterised in that including: claim 1～
APFC control circuit described in 11 any one, the first pin, the second pin, the 3rd draw
Foot and the 4th pin；
The input of the output Current calculation circuit of described APFC control circuit and described have
Second input of the inductive current zero cross detection circuit of active power factor correction control circuit is by described the
One pin is connected with the source electrode of the power switch pipe of DC-DC converter；
The first input end of the inductive current zero cross detection circuit of described APFC control circuit
It is connected with the grid of described power switch pipe by described second pin；
The first input end of the inductive current zero cross detection circuit of described APFC control circuit
It is connected with direct current supply voltage by described 3rd pin；
The input of the error calculation circuit of described APFC control circuit passes through the described 4th
Pin is connected with filter circuit.
13. 1 kinds of LED drive circuits, it is characterised in that including: DC-DC converter, right are wanted
Ask the APFC control circuit described in 1～11 any one and filter circuit；
Described DC-DC converter is for right under the driving of described APFC control circuit
The input voltage of described LED drive circuit converts, and obtains the DC voltage that described LED needs；
Described filter circuit is for the output Current calculation electricity to described APFC control circuit
The current feedback signal that road produces is filtered, to be converted to characterize described electricity by described current feedback signal
The voltage feedback signal of stream feedback signal.
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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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| 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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| CN113541458A (en) * | 2021-05-31 | 2021-10-22 | 广州金升阳科技有限公司 | Filter circuit |
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| CN105722274B (en) | 2019-03-19 |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Wensanlu Road, Hangzhou Province, No. 90 East Software Park, science and technology building A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |