CN106685207A - Total harmonic distortion power control system with low input current and method thereof - Google Patents
Total harmonic distortion power control system with low input current and method thereof Download PDFInfo
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- CN106685207A CN106685207A CN201710049687.1A CN201710049687A CN106685207A CN 106685207 A CN106685207 A CN 106685207A CN 201710049687 A CN201710049687 A CN 201710049687A CN 106685207 A CN106685207 A CN 106685207A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The relation discloses a total harmonic distortion power control system with low input current and method thereof. Provided is the power control system, which comprises integration and sampling components which are set as receiving sampling voltage and reference voltage, and partly based on the sampling voltage and the reference voltage, a first signal is generated, wherein the sampling voltage is obtained by sampling the output current of the power control system, and the first signal is output to a first terminal to generate the offset voltage which compensates the output current of the power control system; modulation components are configured to receive a first voltage based on the first signal and a ramp voltage and generate the modulation signal based on the first voltage and the ramp voltage; logic control modules are configured to receive modulation signal and generate the driving signal based on the modulation signal; driving components are configured to conduct the grid based on the driving signal.
Description
Technical field
This disclosure relates to integrated circuit.More specifically, some embodiments of the present invention are a kind of total with low input current
The power control system and method for harmonic distortion.
Background technology
Certain embodiments of the present invention is related to integrated circuit.More specifically, some embodiments of the present invention are provided being used for
System and method of the power-supply controller of electric to reduce the total harmonic distortion (Total Harmonic Distortion, THD) of power supply.
Only by example, some embodiments of the present invention are applied to Quasi-resonant switching power supply.It should be understood, however, that this hair
It is bright with wider range of application.
According to the control method of the disclosure, can be with the voltage line in the compensating electric capacity of error amplifier in cancellation loop control
Negative effect of the ripple to THD, while the THD optimizations of built-in loop compensation capacity controlling arrangement can be realized, reaches and external loop
The THD of compensating electric capacity control structure is identical even more excellent.
Fig. 1 shows the rough schematic view of traditional BUCK (step-down) Quasi-resonant switching power supply.In the framework according to Fig. 1,
AC (alternating current) inputs are connected to rectifier bridge to provide input voltage VinFor the operation of power conversion system, opened by power
The continuous conducting and shut-off of S1 is closed to reach required output.For example, when S1 closures (for example, conducting) is switched, input voltage
VinVoltage difference with output voltage Vo charges to inductor, the peak I of inductive currentin_peakBy the ON time T of S1onDetermine：
After disconnection (for example, the shut-off) of S1 closures is switched, inductor demagnetization, demagnetization terminates rear MOS (Metal Oxide
Semiconductor, metal-oxide semiconductor (MOS)) transistor is turned on again, therefore induction charging electric current is equal with discharge current,
Draw equation 2：
Ton×(Vin-Vo)=Toff×Vo(equation 2)
The deformation of equation 2 can be obtained：Vin-Vo=Vin× (1-D) (equation 3)
Wherein D represents the dutycycle being associated with internal switch.For example, D is determined as the following formula：
Wherein, ToffRepresent turn-off time section (switch is to disconnect (for example, being turned off) during this period).And dutycycle D is small
In 1.
The then average value I of input currentin_aveCan be determined according to following formula：
The deformation of equation 5 can be obtained：
It can be seen from equation 6, the average value I of input currentin_aveWith the ON time T of S1onIt is directly proportional.
Fig. 2 shows PFC (Power Factor Correction, PFC) system of traditional BUCK frameworks
The rough schematic view of system controller.Voltage in external resistor is delivered to system and is controlled by terminal (for example, terminal CS)
Device, signal transacting is carried out with the different switch periods associated from internal power switch.Inside system controller, pass through
The size of the voltage signal sampling output current at CS ends produces voltage signal VIo_s, with reference voltage Vref_eaError is sent into together
Amplifier.
In the compensating electric capacity C of its exteriorcompUpper generation voltage Vcomp；Detect that demagnetization finish time turns on switch by FB
S1.In the ON time T of S1onIt is interior, the slope current controlled by fixed slope current or by the dutycycle D for switching S1 to
Electric capacity charges and produces ramp voltage.For example, slope current can be approximately in proportion with (1-D) × D in amplitude, so that with
Dutycycle (for example, D) and ON time section are (for example, Ton) duration related product (1-D) × D × TonKeep approximate
It is constant.For example, slope current IrampIt is determined as the following formula：
Wherein, k1Represent figure parameters (for example, constant).
When ramp voltage is higher than comp terminal voltages VcompWhen, switch S1 shut-offs, therefore VcompDetermine from S1 and be conducting to shut-off
Time, i.e. TonTime.If voltage VcompIt is completely constant in a power frequency period, then input current Iin_aveJust can be complete
Follow input voltage V entirelyin, realize optimal THD.
But actual loop compensating electric capacity CcompOn voltage VcompIt is not constant, with input voltage VinPower frequency ripple
It is dynamic, output current and voltage VIo_sAlso can fluctuate, cause the voltage V in compensating electric capacitycompThere is working frequency ripple wave.
Fig. 3 shows the crucial partial schematic diagram of the work wave of traditional BUCK Quasi-resonant switching power supplies.Sampling output
Voltage signal V after electric currentIo_s, reference voltage Vref_ea, voltage Vcomp, input voltage VinWith input current Iin_aveWaveform is as follows
Shown in Fig. 3.
Voltage signal V after sampled output currentIo_sWith reference voltage Vref_eaIntegration is made the difference in outside compensating electric capacity Ccomp
Upper generation voltage Vcomp, the V of left half period in a power frequency periodcompV of the value higher than the right half periodcompValue, i.e. power frequency left half
The T of switch S1 in cycleonTime is more than the right half period, causes input current Iin_aveThe left half period and the right half period it is asymmetric and
Input voltage V cannot completely be followedinWaveform, causes the distortion of input current.
Traditional built-in compensation capacitance structure is not big enough due to internal capacitance, in the compensating electric capacity of error amplifier output
Voltage pulsation is larger, and THD is poor.Accordingly it is highly desirable to improve the technology of voltage pulsation.
Built-in compensation capacitance structure of the invention can be completely eliminated voltage wave in the compensating electric capacity of error amplifier output
Move to TonThe influence of time, makes the THD of built-in compensation capacitance structure more excellent than traditional external compensation capacitance structure.
The content of the invention
Certain embodiments of the present invention is related to integrated circuit.More specifically, some embodiments of the present invention are provided being used for
The system and method for reducing input current total harmonic distortion.Only by example, some embodiments of the present invention have been applied to
Power conversion system.It should be understood, however, that the present invention has wider range of application.For example, according to disclosed method
Go for the pfc controller of Buck, Boost, Buck-Boost and flyback (flyback) framework.
According to one embodiment, there is provided a kind of power control system, including：Integration and sampling component, are configured as connecing
Sampled voltage and reference voltage are received, and is based at least partially on sampled voltage and reference voltage and generate the first signal and second
Signal, wherein sampled voltage are to carry out acquisition of sampling to the output current of power control system, and the first signal is transfused to
Compensated come the output current to power control system with generating offset voltage to the first terminal；Modulation component, is configured to connect
Receive based on secondary signal second voltage and ramp voltage, and based on second voltage and ramp voltage come generate modulation letter
Number；Logic control component, is configured as receiving modulated signal, and generate drive signal based on modulated signal；And drive
Component, is configured as based on drive signal come turn-on grid electrode.
According to another embodiment, there is provided a kind of power control system, including：Integration and sampling component, are configured as connecing
Sampled voltage and reference voltage are received, and is based at least partially on sampled voltage and reference voltage and generate the first signal, wherein
Sampled voltage is to carry out acquisition of sampling to the output current of power control system；Modulation component, is configured as receiving based on the
The first voltage and ramp voltage of one signal, and modulated signal is generated based on first voltage and ramp voltage；Logic control
Component processed, is configured as receiving modulated signal, and generate drive signal based on modulated signal；And drive component, matched somebody with somebody
It is set to based on drive signal come turn-on grid electrode.
According to another embodiment, there is provided a kind of power control method, including：Sampled voltage and reference voltage are received, and
And be based at least partially on sampled voltage and reference voltage and generate the first signal, wherein sampled voltage is to power control system
Output current carry out acquisition of sampling；First voltage and ramp voltage based on the first signal are received, and based on first
Voltage and ramp voltage generate modulated signal；Modulated signal is received, and drive signal is generated based on modulated signal；And
Based on drive signal come turn-on grid electrode.
According to embodiment, it is possible to achieve one or more beneficial effects.With reference to following detailed description and drawings, will be complete
Understand these beneficial effects of the invention and various additional purposes, feature and advantage.
Brief description of the drawings
Fig. 1 shows the rough schematic view of traditional BUCK Quasi-resonant switching power supplies.
Fig. 2 shows the rough schematic view of traditional system controller.
Fig. 3 shows the crucial partial schematic diagram of the work wave of traditional BUCK Quasi-resonant switching power supplies.
Fig. 4 A show the block diagram of system controller in accordance with an embodiment of the present disclosure.
Fig. 4 B show in accordance with an embodiment of the present disclosure, the integration of system controller in Fig. 4 A and showing for sampling component
Example property block diagram.
Fig. 5 show in accordance with an embodiment of the present disclosure, the key of the work wave of system controller in Fig. 4 A it is local
Schematic diagram.
Fig. 6 show in accordance with an embodiment of the present disclosure, the example of the BUCK Quasi-resonant switching power supplies of built-in compensating electric capacity
Property block diagram.
Fig. 7 A show the block diagram of the system controller according to another embodiment of the present disclosure.
Fig. 7 B show in accordance with an embodiment of the present disclosure, the integration of system controller in Fig. 7 A and showing for sampling component
Example property block diagram.
Fig. 8 show in accordance with an embodiment of the present disclosure, the key of the work wave of system controller in Fig. 7 A it is local
Schematic diagram.
Fig. 9 shows the exemplary process diagram of system control method in accordance with an embodiment of the present disclosure.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is better understood from just for the sake of being provided by showing example of the invention to of the invention.The present invention is never limited
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of part and algorithm.In the the accompanying drawings and the following description, known structure and skill is not shown
Art, to avoid that unnecessary obscuring is caused to the present invention.
Fig. 4 A show the block diagram of system controller in accordance with an embodiment of the present disclosure.The figure only as an example,
It should not unduly limit the scope of the claims.It will be apparent to an ordinarily skilled person in the art that many changes, replacement
And modification.
In one example, system controller include ramp signal formation component, under-voltage locking (UVLO) component (for example,
UVLO), modulation component (for example, comparator), logic controller, integration and sampling component, drive component are (for example, raster data model
Device), demagnetization detection components and output current sampling component.
According to one embodiment, signal of the UVLO component detections from Vcc terminal and output signal (for example, por).Example
Such as, if the signal from Vcc terminal is more than the first predetermined threshold in amplitude, system controller starts normally to operate.
If the signal from Vcc terminal is less than the second predetermined threshold in amplitude, system controller is closed.
Voltage in external resistor is delivered to system controller by terminal (for example, terminal CS), with inside
Signal transacting is carried out in the associated different switch periods of power switch.Inside system controller, the output at CS ends is coupled to
Current sample component sampled output current is producing voltage signal VIo_s, with reference voltage Vref_eaFeeding integration and sampling together
Component.Integration and sampling component are based on voltage signal VIo_sWith reference voltage Vref_eaGenerate the first signal and secondary signal.Wherein
Sampled voltage is to carry out acquisition of sampling to the output current of the power control system, and the first signal is imported into first
Terminal (for example, comp terminals) is compensated with generating offset voltage come the output current to power control system.For example, comp
Can with external module be connected for the output of error amplifier to compensate by terminal.According to one embodiment, the first signal exists
The compensating electric capacity C of its exteriorcompUpper generation voltage Vcomp1, secondary signal generated for adjusting T in integration and sampling componenton
The voltage V of timecomp2。
According to one embodiment, such as from the I of ramp signal formation componentrampFlow to ramp signal maker.Another
In one example, modulation component receives ramp signal and exports modulated signal.In another example, logic controller treatment modulation
Signal and by control signal output to drive component.In another example, modulated signal and pulse width modulation (PWM) signal
It is corresponding.In another example, pulse width modulation (PWM) controller also includes overvoltage protection (OVP) detector, another
In example, drive component sends drive signal to GATE ends, to influence the turn-on and turn-off of GATE.
For example, electric current IrampAfter producing ramp voltage by ramp signal formation component, modulation component is by ramp voltage
With voltage Vcomp2Compare, and modulated signal to logic control component is exported based on comparative result.Logic control component is at least
Modulated signal is based in part on to determine the shut-off moment of GATE；Logic control component also by FB voltage detectings demagnetize terminate come
Determine the turn-on instant of GATE.For example, the demagnetization detection components detection feedback signal from FB terminals and trigger signal is defeated
Go out to logic controller to start next cycle (for example, corresponding with next switch periods).
Fig. 4 B show in accordance with an embodiment of the present disclosure, the integration of system controller in Fig. 4 A and showing for sampling component
Example property block diagram.The figure is only as an example, it should not unduly limit the scope of the claims.The ordinary skill people of this area
Member is it should be appreciated that many changes, alternatives and modifications.
According to one embodiment, integration and sampling component include LPF component, error amplifier module, comparator, with
And single-shot trigger circuit.According to one embodiment, LPF component includes first resistor device R1 and the first capacitor C1.
By the voltage signal V produced after sampled output currentIo_sAfter R1, C1 filter its high-frequency fluctuation, with
Reference voltage Vref_eaFeeding comparator compares together.Voltage signal V after filteredIo_sfWith reference voltage Vref_eaIt is sent into together
EA (Error Amplifier) makes the difference integration, to be coupled to the output external compensation electric capacity C of error amplifiercompUpper generation
Voltage Vcomp1。
Voltage signal V after the filteringIo_sfHigher or lower than reference voltage Vref_eaMoment, single triggers circuit produce
Raw sampled signal sample1 or sample2.When sample1 or sample2 signals are high, the output current of EA is close to
Zero, now Vcomp1Voltage is most gentle, with sample1 or sample2 signal sampling voltages Vcomp1Producing voltage on electric capacity
Vcomp2, and this voltage is kept within the time of non-sampled, by voltage Vcomp2Feeding PWM comparators are produced together with ramp signal
Switch the T of S1onTime.
Fig. 5 show in accordance with an embodiment of the present disclosure, the key of the work wave of system controller in Fig. 4 A it is local
Schematic diagram.The figure is only as an example, it should not unduly limit the scope of the claims.One of ordinary skill in the art
It should be appreciated that many changes, alternatives and modifications.
Voltage signal V after sampled output currentIo_sThe voltage signal V for producing afterwards after filteringIo_sfSubstantially input is followed
Voltage change is in sinusoidal waveform (for example, as shown in waveform 501).In each power frequency period, voltage VIo_sfOccur once from
Less than Vref_eaTo higher than Vref_eaMoment produce sampled signal sample1, or occur once from higher than Vref_eaTo being less than
Vref_eaMoment produce sampled signal sample2 (for example, as shown in waveform 502) sample1 signal sampling voltages Vcomp1
The voltage V of generationcomp2As shown in waveform 503.
After system working stability, when each power frequency period sample1 or sample2 signals are high level, sampling electricity
Pressure Vcomp1The V of generationcomp2Voltage is all completely constant, by voltage Vcomp2Producing pwm signal can just eliminate voltage Vcomp1Fluctuation institute
The T for causingonChange.In another example, demagnetization detection components generate pulse in trigger signal and (are not shown with starting next cycle
Go out).
Fig. 6 show in accordance with an embodiment of the present disclosure, the example of the BUCK Quasi-resonant switching power supplies of built-in compensating electric capacity
Property block diagram.Its structure is similar with the Quasi-resonant switching power supply described with reference to Fig. 1, but controller does not exist comp terminals and connection
To the outside comp capacitors of the terminal.The figure is only as an example, it should not unduly limit the scope of the claims.This
The those of ordinary skill in field should be appreciated that many changes, alternatives and modifications.
In the application scenario that the THD to input current has higher requirements, for input current Iin_aveInput can completely be followed
Voltage VinChange, loop compensation electric capacity CcompNeed value larger, so the electric capacity C of PFC system at presentcompIt is typically all outer
Put.
According to preferred embodiment, fixed time sampling error amplifier offset electric capacity of the present invention in each power frequency period
CcompThe mode of voltage can eliminate adverse effect of the voltage ripple to THD in error amplifier compensating electric capacity, then built-in benefit
Repaying the system THD of capacitance structure also can just accomplish equally low with above-mentioned external compensation capacitance structure.Built-in compensating electric capacity
BUCK Quasi-resonant switching power supplies can save a comp terminal and outer as shown in figure 6 above compared with external compensation capacitance structure
Portion's comp capacitors so that system architecture simpler, cost is lower.
Fig. 7 A show the block diagram of the system controller according to another embodiment of the present disclosure.The figure only conduct is shown
Example, it should not unduly limit the scope of the claims.It will be apparent to an ordinarily skilled person in the art that much changing, replacing
Generation and modification.
Voltage V is produced by the size of the voltage signal sampling output current at CS ends firstIo_s, with reference voltage Vref_ea
Feeding integration and sampling component, produce regulation T by integration and sampling component completely togetheronThe V of timecomp4；Electric current IrampBy
With voltage V after ramp signal formation component generation ramp voltagecomp4 compare, so as to determine the shut-off moment of GATE, then lead to
The demagnetization of FB voltage detectings is crossed to terminate to determine the turn-on instant of GATE.
Fig. 7 B show in accordance with an embodiment of the present disclosure, the integration of system controller in Fig. 7 A and showing for sampling component
Example property block diagram.The figure is only as an example, it should not unduly limit the scope of the claims.The ordinary skill people of this area
Member is it should be appreciated that many changes, alternatives and modifications.
The voltage signal V produced after sampled output currentIo_sAfter R1, C1 filter its high-frequency fluctuation, with reference
Voltage Vref_eaFeeding comparator compares together, afterwards voltage signal V after the filteringIo_sfHigher or lower than reference voltage
Vref_eaMoment produce sampled signal sample1 or sample2；Filtered voltage signal VIo_sfWith reference voltage Vref_eaOne
Rise and be sent into EA, with determining frequency, sample integration is internally for fixed duty cycle control signal DS (for example, 10kHz frequencies, 3% dutycycle)
Voltage V is produced on compensating electric capacity C3comp3, in the output current that sample1 or sample2 signals are time error amplifier high
It is close to zero, now voltage Vcomp3 is most gentle, with sample1 or sample2 signal sampling voltages Vcomp3 on the capacitor c 2
Produce voltage Vcomp4 and this voltage is maintained within the time of non-sampled, by voltage Vcomp4 feeding PWM comparators are believed with slope
The T of switch S1 is produced number togetheronTime.
Fig. 8 show in accordance with an embodiment of the present disclosure, the key of the work wave of system controller in Fig. 7 A it is local
Schematic diagram.Voltage V in figurecomp4 by sample1 signal sampling voltages Vcomp3 produce.The figure is only as an example, it should not be uncomfortable
The scope of locality limitation claim.It will be apparent to an ordinarily skilled person in the art that many changes, alternatives and modifications.
Traditional built-in compensation capacitance structure is not big enough due to internal capacitance, in the compensating electric capacity of error amplifier output
Voltage pulsation is larger, and THD is poor；And built-in compensation capacitance structure of the invention can be completely eliminated the benefit of error amplifier output
Voltage pulsation is repaid on electric capacity to TonThe influence of time, makes the THD of built-in compensation capacitance structure than traditional external compensating electric capacity knot
Structure is more excellent.
Also error amplifier and loop mend in the PFC power control structures of Boost, Buck-Boost and flyback framework
Electric capacity is repaid, if using this hair in the loop compensation part of Boost, Buck-Boost and the PFC power supplies of flyback framework
Bright described control method, it is also possible to same to realize lower THD.
Fig. 9 shows the exemplary process diagram of system control method 900 in accordance with an embodiment of the present disclosure.The figure only conduct
Example, it should not unduly limit the scope of the claims.It will be apparent to an ordinarily skilled person in the art that many changes,
Alternatives and modifications.
Method 900 starts from step 901, receives sampled voltage and reference voltage, and be based at least partially on sampling electricity
Press with reference voltage to generate the first signal, wherein sampled voltage is to carry out sampling acquisition to the output current of power control system
's.
Method subsequently continues to step 902, receives first voltage and ramp voltage based on the first signal, and be based on
First voltage and ramp voltage generate modulated signal.
In step 903, receive modulated signal, and drive signal is generated based on modulated signal；And believed based on driving
Number carry out turn-on grid electrode.
For example, some or all of components of various embodiments of the present invention are used one or more component softwares, one
One or more combinations of individual or multiple nextport hardware component NextPorts, and/or software and hardware component, individually and/or at least with another component
It is implemented in combination with.In another example, some or all of components of various embodiments of the present invention by individually and/or at least with separately
One component is implemented in combination with one or more circuits, all one or more analog circuits in this way of these circuits and/or one or
Multiple digital circuits.In another example, various embodiments of the present invention and/or example can be combined.
Notwithstanding specific embodiment of the invention, skilled person will understand that be other embodiment phase
When in described embodiment.It will be appreciated, therefore, that the invention is not restricted to the embodiment for specifically illustrating, and only by appended power
The limitation of the scope that profit is required.
Claims (10)
1. a kind of power control system, including：
Integration and sampling component, the integration and sampling component are configured as receiving sampled voltage and reference voltage, and at least
It is based in part on the sampled voltage and the reference voltage to generate the first signal and secondary signal, wherein the sampled voltage
It is that acquisition of sampling is carried out to the output current of the power control system, and first signal is imported into the first terminal
Compensated come the output current to the power control system with generating offset voltage；
Modulation component, the modulation component is configured as receiving second voltage and ramp voltage based on the secondary signal,
And modulated signal is generated based on the second voltage and the ramp voltage；
Logic control component, the logic control component is configured as receiving the modulated signal, and based on the modulation letter
Number generate drive signal；And
Drive component, the drive component is configured as based on the drive signal come turn-on grid electrode.
2. power control system as claimed in claim 1, also includes：
Demagnetization detection components, the demagnetization detection components are configured as detecting the feedback signal of the power control system, and
Trigger signal is generated based on the feedback signal；
Wherein described drive component is additionally configured to：Grid is turned off based on the trigger signal.
3. power control system as claimed in claim 1, wherein the integration and sampling component include：
Low pass filter, the low pass filter is configured as being filtered the sampled voltage；
Error amplifier, the error amplifier is configured as doing difference-product to filtered sampled voltage and the reference voltage
Point, to be coupled to generation compensation electricity on first capacitor at the output two ends of the first terminal and the error amplifier
Pressure；
Comparator, the comparator is configured as being gone above or less than the reference voltage in the filtered sampled voltage
Moment output comparison signal；And
Single-shot trigger circuit；The single-shot trigger circuit is configured as generating sampled signal based on the comparison signal, with coupling
The second voltage is produced on to the second electric capacity between the single-shot trigger circuit and the modulation component.
4. power control system as claimed in claim 1, also includes：
Under-voltage locking UVLO components, the UVLO components are configured as signal of the detection from Vcc terminal and export UVLO letters
Number, if the signal from Vcc terminal is more than the first predetermined threshold in amplitude, the power control system starts just
Often operate；And if the signal from Vcc terminal is less than the second predetermined threshold, the then power supply in amplitude
System is closed.
5. power control system as claimed in claim 1, also includes：
Ramp signal maker, the ramp signal maker is configured as receiving slope current, and is based at least partially on
The slope current generates the ramp voltage.
6. a kind of power control system, including：
Integration and sampling component, the integration and sampling component are configured as receiving sampled voltage and reference voltage, and at least
It is based in part on the sampled voltage and the reference voltage to generate the first signal, wherein the sampled voltage is to the electricity
The output current of source control system carries out acquisition of sampling；
Modulation component, the modulation component is configured as receiving first voltage and ramp voltage based on first signal,
And modulated signal is generated based on the first voltage and the ramp voltage；
Logic control component, the logic control component is configured as receiving the modulated signal, and based on the modulation letter
Number generate drive signal；And
Drive component, the drive component is configured as based on the drive signal come turn-on grid electrode.
7. power control system as claimed in claim 6, also includes：
Demagnetization detection components, the demagnetization detection components are configured as detecting the feedback signal of the power control system, and
Trigger signal is generated based on the feedback signal；
Wherein described drive component is additionally configured to：Grid is turned off based on the trigger signal.
8. power control system as claimed in claim 6, wherein the integration and sampling component include：
Low pass filter, the low pass filter is configured as being filtered the sampled voltage；
Error amplifier, the error amplifier is configured as doing difference-product to filtered sampled voltage and the reference voltage
Point, to be generated in the compensation capacitor of output for being connected to the error amplifier based on predetermined fixed duty signal
Offset voltage；
Comparator, the comparator is configured as being gone above or less than the reference voltage in the filtered sampled voltage
Moment output comparison signal；And
Single-shot trigger circuit；The single-shot trigger circuit is configured as generating sampled signal based on the comparison signal, with coupling
The first voltage is produced on to the first capacitor between the single-shot trigger circuit and the modulation component.
9. a kind of power control method, including：
Sampled voltage and reference voltage are received, and is based at least partially on the sampled voltage and the reference voltage and generated
First signal, wherein the sampled voltage is to carry out acquisition of sampling to the output current of the power control system；
First voltage and ramp voltage based on first signal are received, and based on the first voltage and the slope
Voltage generates modulated signal；
Receive the modulated signal, and drive signal is generated based on the modulated signal；And
Based on the drive signal come turn-on grid electrode.
10. power control method as claimed in claim 9, also includes：
The feedback signal of power control system is detected, and trigger signal is generated based on the feedback signal；And
Grid is turned off based on the trigger signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107682955A (en) * | 2017-09-30 | 2018-02-09 | 上海晶丰明源半导体股份有限公司 | Controller, demagnetization detection method and the LED drive system being applicable |
| CN108336903A (en) * | 2018-03-13 | 2018-07-27 | 杰华特微电子（杭州）有限公司 | Control circuit and control method for reduction voltage circuit |
| CN110266182A (en) * | 2019-05-20 | 2019-09-20 | 杭州电子科技大学 | A kind of adaptive following controller of PFC output voltage |
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| CN110266182A (en) * | 2019-05-20 | 2019-09-20 | 杭州电子科技大学 | A kind of adaptive following controller of PFC output voltage |
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Also Published As
| Publication number | Publication date |
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| CN106685207B (en) | 2019-04-05 |
| TWI625921B (en) | 2018-06-01 |
| TW201828577A (en) | 2018-08-01 |
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