CN104702095B - Switching power supply controller and switching power supply comprising switching power supply controller - Google Patents
Switching power supply controller and switching power supply comprising switching power supply controller Download PDFInfo
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- CN104702095B CN104702095B CN201510150178.9A CN201510150178A CN104702095B CN 104702095 B CN104702095 B CN 104702095B CN 201510150178 A CN201510150178 A CN 201510150178A CN 104702095 B CN104702095 B CN 104702095B
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Classifications
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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
- H02M1/12—Arrangements for reducing harmonics from ac 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
-
- 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 invention provides a switching power supply controller and a switching power supply comprising the switching power supply controller. The controller comprises a zero crossing detection circuit for performing zero crossing detection on an input feedback signal and generating a zero crossing detection, an on time detection circuit for detecting the on time of a switching tube in the switching power supply to obtain an on time timing voltage, a switching cycle time detection circuit for detecting the switching cycle time of the switching tube to obtain a switching cycle time timing voltage, an on time length control circuit for generating an off signal according to the on time timing voltage, the switching cycle time timing voltage and a compensating voltage so that the on time of the switching tube is correlated to the on time timing voltage and the switching cycle time timing voltage, and a driving signal generation circuit for generating a driving signal according to the zero-crossing signal and the off signal. The switching power supply controller is capable of optimizing the power factor of the switching power supply controlled by a critical on mode and reducing total harmonic distortion.
Description
Technical field
There is power factor adjustment function, critical conduction mode the present invention relates to switch power technology, more particularly to one kind
The switch power controller of control, and the Switching Power Supply comprising the switch power controller.
Background technology
It is traditional it is Alternating Current Power Supply, driven with power factor adjustment (PFC) function, the isolation LED constant current of critical conduction mode
Dynamic circuit is as shown in figure 1, mainly include：AC input rectification circuit 101, input AC source 102, input capacitance Cin, resistance 104,
Electric capacity 105, diode 106, isolating transformer T1, power switch 112, sampling resistor Rs, resistance 113, output commutation diode
D1, output capacitance Cbulk, constant current switching power controller 100.Wherein, controller 100 is used to receive from isolating transformer T1
Auxiliary group of winding L3 feedback signal FB, the primary current of the primary side winding L1 of sampling resistor Rs samplings isolating transformer T1, and
Input energy, output is transferred to by isolating transformer T1 by driving power switch 112.
Constant current switching power controller 100 includes：Zero cross detection circuit 125, after detecting that drive signal GD terminates
Feedback signal FB zero passages, the signal of opening of power switch 112, conducting power switch 112, mistake are given in feedback signal FB zero passages
Zero detection circuit 125 also obtains the degaussing time Tdemag of transformer T1, and transmits it to constant-current control circuit 120；Constant current
Counting circuit 120, obtains primary side peak point current, by zero cross detection circuit by the voltage on sampling resistor Rs sample
The 125 degaussing time Tdemag for obtaining transformer T1, degaussing time Tdemag are exactly that the electric current for exporting commutation diode D1 is led
The logical time, the size of output current is calculated by primary side peak point current, transformer degaussing time Tdemag；Error amplifier 121,
The output current that constant current counting circuit 120 is calculated does error amplification, output error voltage COMP, error voltage with reference current
COMP connects compensating electric capacity 114 so that after loop stability, error voltage COMP is substantially stationary；ON time length control circuit
122, the ON time length of power switch 112 is controlled, timing is started when power switch 112 begins to turn on, when reaching setting
ON time when, export cut-off signals to trigger 123, go switch-off power switch 112, after loop stability, error voltage
When COMP is fixed, the ON time consistent length of power switch 112 is achieved in power factor adjustment；Trigger 123, receives
The zero cross signal ZCD of the output of zero cross detection circuit 125 and the cut-off signals of the output of ON time length control circuit 122；Drive
The drive end of circuit 124, connection trigger 123 and power switch 112, realization turns on and off driving to power switch 112.
To realize preferable power factor Adjustment effect, it is desirable to the AC input electric current of each switch periods can well with
With the change of input voltage.Under critical conduction mode, ignore the pressure drop of output commutation diode, input rectifying tube voltage drop, power
Pressure drop during switch conduction, the average current input of each switch periods is：
Wherein, n is the turn ratio of the primary side winding L1 and vice-side winding L2 of transformer T1, VoutIt is output voltage, VinIt is input
Voltage, IinIt is input current, TonIt is ON time, L is the inductance of primary side winding L1.Using fixed ON time (namely TonIt is permanent
Calmly), when critical conduction mode is controlled, input current IinInput voltage V can not completely be followedinChange, power factor is deteriorated, always
Harmonic distortion is increased, and input voltage VinHigher, deviation is bigger, so the power factor of circuit traditional at present is not spy
Not good, total harmonic distortion is also larger.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of switch power controller and comprising the switch power controller
Switching Power Supply, can optimize critical conduction mode control Switching Power Supply power factor, reduce total harmonic distortion.
In order to solve the above technical problems, the invention provides a kind of switch power controller, including：
Zero cross detection circuit, the feedback signal to being input into carries out zero passage detection and produces zero cross signal；
ON time detects circuit, and the ON time to the switching tube in Switching Power Supply is detected, to obtain during conducting
Between timing voltage；
Switch periods time detection circuit, the switch periods time to the switching tube is detected, to obtain switch week
Time phase timing voltage；
ON time length control circuit, with output end, the switch periods time detecting that the ON time detects circuit
The output end of circuit is connected, and receives offset voltage, according to the ON time timing voltage, switch periods time timing voltage
And offset voltage produces cut-off signals, so that the ON time of the switching tube and the ON time timing voltage, switch
Cycle time timing voltage is associated；
Drive signal generation circuit, drive signal, the drive signal are produced according to the zero cross signal and cut-off signals
Transmit to the drive end of the switching tube, in response to the zero cross signal, the drive signal controls the switching tube conducting；Ring
Cut-off signals described in Ying Yu, the drive signal controls the switching tube shut-off.
According to one embodiment of present invention, the magnitude of voltage of the ON time timing voltage is proportional to the switching tube
ON time, the switch periods time timing voltage is proportional to the switch periods time of the switching tube, the ON time
The cut-off signals that length control module is produced cause that the ON time reduces with the increase of the ON time timing voltage,
And increase with the increase of the switch periods time timing voltage.
According to one embodiment of present invention, the cut-off signals that the ON time length control module is produced make described opening
The ON time Ton for closing pipe meets following relation：VTon×Ton/VTKeep fixing, wherein, VTonFor the ON time regularly
Voltage, VTIt is the switch periods time timing voltage.
According to one embodiment of present invention, the ON time timing voltage that the ON time detection circuit is obtained is represented
ON time of the switching tube in previous switch periods, or represent the switching tube within the preceding multiple switch cycle
The average value of ON time.
According to one embodiment of present invention, the switch periods time that the switch periods time detection circuit is obtained is regularly
Voltage represents switch periods time of the switching tube in previous switch periods, or represents the switching tube in preceding multiple
The average value of the switch periods time in switch periods.
According to one embodiment of present invention, the ON time detects the input of circuit and the driving of the switching tube
End is directly connected to, and is detected with the ON time to the switching tube.
According to one embodiment of present invention, the input of the switch periods time detection circuit and the switching tube
Drive end is directly connected to, and is detected with the switch periods time to the switching tube.
According to one embodiment of present invention, the switch power controller also includes：
Constant current counting circuit, samples to flowing through the primary current of switching tube of the Switching Power Supply, obtains primary side peak
Value electric current, and electricity is exported by the transformer degaussing Time Calculation that the primary side peak point current and the zero cross detection circuit are exported
Stream；
Error amplifier, carries out error and puts to the output current that the constant current calculates circuit output with default reference current
Greatly, output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
According to one embodiment of present invention, the switch power controller also includes：
Voltage sampling circuit, the voltage to the output end of the Switching Power Supply is sampled, and obtains exporting sampled voltage；
Error amplifier, carries out error and puts to the sampled voltage that the voltage sampling circuit is exported with default reference voltage
Greatly, output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
According to one embodiment of present invention, the drive signal generation circuit includes：Rest-set flip-flop, its set input
The zero cross signal is received, its RESET input receives the cut-off signals, its output end produces the drive signal.
According to one embodiment of present invention, the drive signal generation circuit also includes：Driver, the drive signal
Transmitted via the driver to the drive end of the switching tube.
According to one embodiment of present invention, the ON time detection circuit includes：
First current source；
First switch, its first end connects the output end of first current source；
Second switch, its first end connects the second end of the first switch, its second end ground connection；
First electric capacity, its first end connects the second end of the first switch and the first end of the second switch, and it the
Two ends are grounded；
Voltage follower, its input connects the first end of first electric capacity；
3rd switch, its first end connects the output end of the voltage follower；
Second electric capacity, the second end of its first end connection the 3rd switch, its second end ground connection, second electric capacity
Second end exports the ON time timing voltage.
According to one embodiment of present invention, turned in response to the switching tube, the first switch conducting, described second
Switch and the 3rd switch OFF, first current source charge to first electric capacity so that the electricity at the first electric capacity two ends
Pressure is directly proportional to the ON time of the switching tube；In response to switching tube shut-off, the first switch and second switch are closed
Disconnected, the 3rd switch conduction, the voltage at the first electric capacity two ends is maintained and is opened via the voltage follower and the 3rd
Pass is transferred to second electric capacity；After switching tube shut-off Preset Time, the first switch and the 3rd switch are closed
Disconnected, the second switch conducting, the voltage at the first electric capacity two ends resets, and the voltage on second electric capacity remains unchanged.
According to one embodiment of present invention, the ON time length control circuit includes：
Second current source；
3rd electric capacity, its first end connects the output end of second current source, its second end ground connection；
4th switch, its first end connects the first end of the 3rd electric capacity, and its second end connects the 3rd electric capacity
Second end；
Comparator, its first input end connects the first end of the 3rd electric capacity, and its second input receives default ginseng
Voltage is examined, its output end is used to export the cut-off signals.
In order to solve the above problems, present invention also offers a kind of Switching Power Supply, including switch power controller and with
Its connected peripheral circuit, wherein, the switch power controller includes：
Zero cross detection circuit, the feedback signal to being input into carries out zero passage detection and produces zero cross signal；
ON time detects circuit, and the ON time to the switching tube in Switching Power Supply is detected, to obtain during conducting
Between timing voltage；
Switch periods time detection circuit, the switch periods time to the switching tube is detected, to obtain switch week
Time phase timing voltage；
ON time length control circuit, with output end, the switch periods time detecting that the ON time detects circuit
The output end of circuit is connected, and receives offset voltage, according to the ON time timing voltage, switch periods time timing voltage
And offset voltage produces cut-off signals, so that the ON time of the switching tube and the ON time timing voltage, switch
Cycle time timing voltage is associated,
Drive signal generation circuit, drive signal, the drive signal are produced according to the zero cross signal and cut-off signals
Transmit to the drive end of the switching tube, in response to the zero cross signal, the drive signal controls the switching tube conducting；Ring
Cut-off signals described in Ying Yu, the drive signal controls the switching tube shut-off.
According to one embodiment of present invention, the magnitude of voltage of the ON time timing voltage is proportional to the switching tube
ON time, the switch periods time timing voltage is proportional to the switch periods time of the switching tube, is led in response to described
Logical time timing voltage increase, the cut-off signals that the ON time length control module is produced cause that the ON time subtracts
It is small, in response to switch periods time timing voltage increase, the cut-off signals that the ON time length control module is produced
So that the ON time increase.
According to one embodiment of present invention, the cut-off signals that the ON time length control module is produced make described opening
The ON time Ton for closing pipe meets following relation：VTon×Ton/VTKeep fixing, wherein, VTonFor the ON time regularly
Voltage, VTIt is the switch periods time timing voltage.
According to one embodiment of present invention, the ON time timing voltage that the ON time detection circuit is obtained is represented
ON time of the switching tube in previous switch periods, or represent the switching tube within the preceding multiple switch cycle
The average value of ON time.
According to one embodiment of present invention, the switch periods time that the switch periods time detection circuit is obtained is regularly
Voltage represents switch periods time of the switching tube in previous switch periods, or represents the switching tube in preceding multiple
The average value of the switch periods time in switch periods.
The switch periods time timing voltage that the switch periods time detection circuit is obtained represents the switching tube preceding
The switch periods time in one switch periods, or when representing switch periods of the switching tube within the preceding multiple switch cycle
Between average value.
According to one embodiment of present invention, the ON time detects the input of circuit and the driving of the switching tube
End is directly connected to, and is detected with the ON time to the switching tube.
According to one embodiment of present invention, the input of the switch periods time detection circuit and the switching tube
Drive end is directly connected to, and is detected with the switch periods time to the switching tube.
According to one embodiment of present invention, the switch power controller also includes：
Constant current counting circuit, samples to flowing through the primary current of switching tube of the Switching Power Supply, obtains primary side peak
Value electric current, and electricity is exported by the transformer degaussing Time Calculation that the primary side peak point current and the zero cross detection circuit are exported
Stream；
Error amplifier, carries out error and puts to the output current that the constant current calculates circuit output with default reference current
Greatly, output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
According to one embodiment of present invention, the switch power controller also includes：
Voltage sampling circuit, the voltage to the output end of the Switching Power Supply is sampled, and obtains exporting sampled voltage；
Error amplifier, carries out error and puts to the sampled voltage that the voltage sampling circuit is exported with default reference voltage
Greatly, output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
According to one embodiment of present invention, the drive signal generation circuit includes：Rest-set flip-flop, its set input
The zero cross signal is received, its RESET input receives the cut-off signals, its output end produces the drive signal.
According to one embodiment of present invention, the drive signal generation circuit also includes：Driver, the drive signal
Transmitted via the driver to the drive end of the switching tube.
According to one embodiment of present invention, the ON time detection circuit includes：
First current source；
First switch, its first end connects the output end of first current source；
Second switch, its first end connects the second end of the first switch, its second end ground connection；
First electric capacity, its first end connects the second end of the first switch and the first end of the second switch, and it the
Two ends are grounded；
Voltage follower, its input connects the first end of first electric capacity；
3rd switch, its first end connects the output end of the voltage follower；
Second electric capacity, the second end of its first end connection the 3rd switch, its second end ground connection, second electric capacity
Second end exports the ON time timing voltage.
According to one embodiment of present invention, turned in response to the switching tube, the first switch conducting, described second
Switch and the 3rd switch OFF, first current source charge to first electric capacity so that the electricity at the first electric capacity two ends
Pressure is directly proportional to the ON time of the switching tube；In response to switching tube shut-off, the first switch and second switch are closed
Disconnected, the 3rd switch conduction, the voltage at the first electric capacity two ends is maintained and is opened via the voltage follower and the 3rd
Pass is transferred to second electric capacity；After switching tube shut-off Preset Time, the first switch and the 3rd switch are closed
Disconnected, the second switch conducting, the voltage at the first electric capacity two ends resets, and the voltage on second electric capacity remains unchanged.
According to one embodiment of present invention, the ON time length control circuit includes：
Second current source；
3rd electric capacity, its first end connects the output end of second current source, its second end ground connection；
4th switch, its first end connects the first end of the 3rd electric capacity, and its second end connects the 3rd electric capacity
Second end；
Comparator, its first input end connects the first end of the 3rd electric capacity, and its second input receives default ginseng
Voltage is examined, its output end is used to export the cut-off signals.
According to one embodiment of present invention, the peripheral circuit is reverse exciting topological or buck topology.
Compared with prior art, the present invention has advantages below：
The switch power controller of the embodiment of the present invention is controlled to the ON time of the switching tube in Switching Power Supply, makes
Its ON time, switch periods time correlation connection with the previous or preceding multiple switch cycle of switching tube, so as to improve electricity
The power factor on road, reduces the total harmonic distortion of Switching Power Supply.
Furthermore, the switch power controller of the embodiment of the present invention causes that the ON time of switching tube meetsKeep fixing so that input current follows input voltage to change completely, realizes good power factor performance.Its
In, Ton is the ON time of switching tube, and T is the switch periods time of Switching Power Supply.
Brief description of the drawings
Fig. 1 be it is of the prior art it is a kind of have power factor adjustment function, using fixed ON time control, critical lead
The electrical block diagram of the LED constant-current driver of logical Schema control；
Fig. 2 is the electrical block diagram of Switching Power Supply according to a first embodiment of the present invention；
Fig. 3 is a kind of structural representation for realizing circuit of the ON time detection circuit in Fig. 2；
Fig. 4 is a kind of structural representation for realizing circuit of the ON time length control circuit in Fig. 2；
Fig. 5 is the electrical block diagram of Switching Power Supply according to a second embodiment of the present invention.
Specific embodiment
Formula (1) in background technology understands, due to input current can not follow completely input voltage change be by
It is controlled as caused by fixation in ON time, therefore, in order to optimize power factor, optimization total harmonic distortion, can change
ON time length, on-fixed amount is revised as by ON time length.
Further, formula (1) is converted into equation below：
Wherein T is the switch periods time.
In order to realize preferable power factor, it is necessary to input current follows input voltage to change completely, it is therefore desirable to
EnsureIt is fixed, so as to improve power factor, i.e. the ratio guarantor square with switch periods of the ON time of switching tube
Hold fixation.
Generally, the ON time of switching tube and switch periods time is substantially in the adjacent several switch periods of Switching Power Supply
It is identical, therefore, it is possible to use the ON time of previous switch periods and switch periods time control next switch periods
ON time so that the ON time of switching tube square with switch periods ratio keep fix.
With reference to specific embodiments and the drawings, the invention will be further described, but should not limit guarantor of the invention with this
Shield scope.
First embodiment
With reference to Fig. 2, Fig. 2 shows the circuit structure of the Switching Power Supply of first embodiment, and the Switching Power Supply is opened up for inverse-excitation type
Flutter, the reverse exciting topological Switching Power Supply can serve as LED driver.As described in Figure 2, the Switching Power Supply can include：Exchange letter
Number source 102, rectifier bridge 101, input capacitance Cin, supplying resistance 104, power supply capacitor 105, diode 106, transformer T1 (including
Primary side winding L1, vice-side winding L2, assists winding L3), switching tube 112, sampling resistor Rs, feedback resistance 113, loop compensation electricity
Hold 114, output diode D1, output capacitance Cbulk and switch power controller 200, the integrated connection of above-mentioned all parts
Mode is identical with the inverse-excitation type switch power-supply of routine, such as the Integral connection structure with Fig. 1 in background technology is identical.
Wherein, switch power controller 200 can include：Zero cross detection circuit 125, ON time detects circuit 126, opens
Close cycle time detection circuit 127, constant current counting circuit 120, error amplifier 121, ON time length control circuit 132,
Rest-set flip-flop 123, driver 124.
Wherein, the feedback signal FB of 125 pairs of inputs of zero cross detection circuit carries out zero passage detection and produces zero cross signal ZCD,
Feedback signal FB comes from the different name end of the assists winding L3 of transformer T1, is input into zero passage detection via feedback resistance 113
Circuit 125.Zero cross detection circuit 125 also detects the degaussing time Tdemag of transformer T1, and transmits it to constant current calculating electricity
Road 120.
ON time detects the ON time of the detection switch pipe 112 of circuit 126, and the ON time for detecting is converted into
ON time timing voltage.ON time timing voltage is kept, to control the ON time of next switch periods.
Switch periods detect the switch periods time of the detection switch pipe 112 of circuit 127, and put up with the switch week for liking that you measure
Time phase is converted into switch periods time timing voltage.The switch periods time timing voltage is kept, to control next opening
The ON time in pass cycle.
Used as a preferred embodiment, the input of ON time detection circuit 126 can be with the driving of switching tube 112
End is directly connected to, with the drive signal of direct detection switching tube 112.By the detection to drive signal, can be to ON time
Regularly, ON time timing voltage V is obtainedTon, ON time timing voltage VTonHeight represent the length of ON time.Make
It is a nonrestrictive example, ON time timing voltage VTonMagnitude of voltage be directly proportional to ON time.
Wherein, ON time timing voltage VTonWhen can represent conducting of the switching tube 112 in previous switch periods
Between, or the average value that ON time of the switching tube 112 within the preceding multiple switch cycle can also be represented.
With reference to Fig. 3, Fig. 3 shows that one kind of ON time detection circuit realizes circuit, including：First current source 301；The
One switch S1, its first end connects the output end of the first current source 301；Second switch S2, its first end connection first switch S1
The second end, its second end ground connection；First electric capacity 305, second end of its first end connection first switch S1 and second switch S2
First end, its second end ground connection；Voltage follower 307, its input connects the first end of the first electric capacity 305；3rd switch
S3, its first end connects the output end of voltage follower 307；Second electric capacity 306, its first end connection the 3rd switchs the second of S3
End, its second end ground connection, the second end of the second electric capacity 306 is used to export ON time timing voltage VTon。
Furthermore, when switching tube 112 is turned on, first switch S1 is controlled as conducting, and second switch S2 is controlled as
Shut-off, the 3rd switch SW3 is controlled as shut-off, and the output current I1 of the first current source 301 charges to the first electric capacity 305, and first
The voltage at the two ends of electric capacity 305 is directly proportional to the ON time of switching tube 112, being capable of direct reaction ON time；Switching tube 112 is closed
When disconnected, first switch S1 is controlled as shut-off, and second switch S2 is controlled as shut-off, and the 3rd switch S3 is controlled as conducting, the
The voltage at the two ends of one electric capacity 305 is maintained, and the voltage at the two ends of the first electric capacity 305 is transmitted through the switch of voltage follower the 307, the 3rd S3
Onto the second electric capacity 306, so as to obtain representing the ON time timing voltage V of ON time at the two ends of the second electric capacity 306Ton；
By after Preset Time, first switch S1 shut-offs, second switch S2 conductings, the 3rd switch S3 is turned off, the two ends of the first electric capacity 305
Voltage resets, and the voltage at the two ends of the second electric capacity 306 remains unchanged.Next, next switch periods are waited, detection conducting again
Time.
Referring still to Fig. 2, in a nonrestrictive example, switch periods detection circuit 127 is directly connected to switching tube
To detect drive signal, switch periods detection circuit 127 can be switched 112 drive end to whole switch periods regularly
Cycle time timing voltage VT, switch periods time timing voltage VTHeight illustrate the length of switch periods.For example, leading
Logical time timing voltage VTonMagnitude of voltage be directly proportional to ON time.
In another nonrestrictive example, switch periods time detection circuit 127 is directly connected to the driving of switching tube 112
With the drive signal of detection switch pipe 112, switch periods time detection circuit 127 can be to the turn-off time in switch periods at end
Regularly, turn-off time timing voltage V is obtainedToff, turn-off time timing voltage VToffHeight illustrate the length of turn-off time
It is short.For example, turn-off time timing voltage VToffCan be directly proportional with the turn-off time.Then, switch periods time detection circuit 127
Can be by ON time timing voltage VTonWith turn-off time timing voltage VToffIt is added, so that when can also obtain switch periods
Between timing voltage VT。
Switch periods time timing voltage VTWhen can represent switch periods of the switching tube 112 in previous switch periods
Between, or the average value that switch periods time of the switching tube 112 within the preceding multiple switch cycle can also be represented.
Switch periods time detection circuit 127 realize circuit can with ON time detection circuit 126 it is identical.For example,
Can also be using the circuit structure shown in Fig. 3.
ON time length control circuit 132 detects output end, the switch periods time detecting of circuit 126 with ON time
The output end of circuit 127 is connected, and receives the offset voltage V at the two ends of loop compensating electric capacity 114COMP, according to ON time regularly
Voltage VTon, switch periods time timing voltage VTAnd offset voltage produces cut-off signals, so that during the conducting of switching tube 112
Between with ON time timing voltage VTon, switch periods time timing voltage VTIt is associated.For example, ON time length control electricity
The control that road 132 passes through the generation moment to cut-off signals so that the ON time of switching tube 112 is with ON time timing electricity
Pressure VTonIncrease and reduce, the ON time of switching tube 112 is with switch periods timing voltage VTIncrease and increase.
Still further, begun to turn in response to switching tube 112, ON time length control circuit 132 starts timing,
The ON time for reaching setting then produces cut-off signals.
Used as a preferred embodiment, the cut-off signals that ON time length control circuit 132 is produced cause switching tube
112 ON time meets following relation：Keep fixing, wherein VTonFor ON time detection circuit 126 is exported
ON time timing voltage, VTIt is the switch periods time timing voltage of the output of switch periods time detection circuit 127, TonFor
ON time of the switching tube 112 within the single switch cycle.
ON time timing voltage VTonDuring ON time or the conducting in preceding multiple switch cycle with previous switch periods
Between average value be directly proportional, switch periods time timing voltage VTWith the switch periods time in previous switch periods or preceding many
The average value of the switch periods time of individual switch periods is directly proportional.In practice, front and rear several switch periods are typically base
Identical in sheet, when realizingKeep fixing, be also equivalent to realizeKeep fixing, that is, realize
The requirement of aforementioned formula (2), the i.e. ON time of switching tube 112 square keep fixing with the ratio of switch periods, so as to
Enough improve power factor.
120 pairs of primary currents for flowing through switching tube 112 of constant current counting circuit are sampled, and obtain primary side peak point current, and
The transformer degaussing time T exported by the primary side peak point current and zero cross detection circuit 125demagCalculate output current；Error is put
The output current that big device 121 is exported to constant current counting circuit 120 carries out error amplification, output error electricity with default reference current
Pressure, the error voltage is applied on loop compensation electric capacity 114.In loop stability, the error voltage is loop compensation electric capacity
Offset voltage V on 114COMP。
The set input of rest-set flip-flop 123 receives zero cross signal ZCD, and the RESET input is received and comes from ON time length
The cut-off signals of the control output of circuit 132, its output end produces drive signal GD with the turn-on and turn-off of controlling switch pipe 112.
Used as a nonrestrictive example, drive signal GD after driver 124 via transmitting to the drive end of switching tube 112.
ON time length control circuit 132 generally can realize timing to the discharge and recharge of electric capacity by electric current.With reference to figure
A kind of 4, Fig. 4 circuits of realizing for showing logical time span control circuit, including：Second current source 401；3rd electric capacity C1, its
First end connects the output end of the second current source 401, its second end ground connection；4th switch S4, its first end connects the 3rd electric capacity
The first end of C1, its second end connects second end of the 3rd electric capacity C1；Comparator 402, its first input end connects the 3rd electric capacity
The first end of C1, its second input receives default reference voltage Vref 1, and its output end is used to export cut-off signals.
Assuming that the charging current of the output of the second current source 401 is I1, the capacitance of the 3rd electric capacity C1 is C1, reference voltage
The magnitude of voltage of Vref1 is Vref1, then
Wherein TonIt is ON time.For TonFor fixed circuit, setting compensation voltage VCOMPIt is Vref1, charging current
I1It is constant, then due to offset voltage VCOMPIt is a definite value for determination after loop stability, therefore can realizes that ON time is consolidated
Fixed effect.
As it was previously stated, in order to realizeIt is constant to improve power factor, it is necessary toIt is constant, and
Detect VTon、VTIn the case of,It is constant be easily realize.
If setting compensation voltage VCOMPConstant is Vref1, charging current I1Can be expressed asWherein I0For normal
Number, then have
I.e.It is constant, namely ensure thatIt is constant.
For the fixed ON time control circuit for example described in background technology, as long as ensureingGu
It is fixed, just can well realize that input current follows input voltage, so as to effectively improve the power factor of circuit, reduce total harmonic wave and lose
Very.It will be appreciated by those skilled in the art that in addition to the scheme that above example is given, can also using other appropriate schemes come
EnsureIt is fixed so that ON time is with ON time timing voltage VTonIncrease and reduce, it is fixed with the switch periods time
When voltage VTIncrease and increase.
Second embodiment
With reference to Fig. 5, in the second embodiment shown in Fig. 5, the switch power controller 200 in Fig. 2 is applied to lifting
In the Switching Power Supply of pressure topology.The peripheral circuit of the buck Switching Power Supply can be any appropriate circuit structure.As one
Individual nonrestrictive example, the peripheral circuit of the buck Switching Power Supply shown in Fig. 5 includes：Input AC source 102, rectifier bridge
101st, input capacitance Cin, supplying resistance 104, power supply capacitor 105, diode 106, transformer T2 (including primary side winding L4 and auxiliary
Help winding L5), switching tube 112, sampling resistor Rs, feedback resistance 113, loop compensation electric capacity 114, output diode D1, output
Electric capacity Cbulk.In addition to the topological structure difference of peripheral circuit, the second embodiment and Fig. 2 shown in Fig. 5 are all identical.
It will be appreciated by those skilled in the art that current constant control loop is used in embodiment shown in Fig. 2 and Fig. 5, its
What is controlled is the output current of output end, and wherein loop compensation electric capacity 114 is used for loop compensation.If using Isobarically Control ring
Road, output voltage Vout is changed to by controlled quentity controlled variable, then loop compensation electric capacity 114 is used for the stability of offset voltage loop, compensation electricity
Pressure VCOMPIt is then that error amplifies voltage.Specifically, the constant current counting circuit 120 in Fig. 2, Fig. 5 is replaced by voltage sample electricity
Road, the output end Vout voltage to Switching Power Supply is sampled, and obtains sampled voltage；And error amplifier 121 is changed to voltage
The sampled voltage of sample circuit output carries out error amplification with default reference voltage, and output error voltage, the error voltage is applied
It is added on loop compensation electric capacity 114；Other circuit structures are constant, you can realize that power factor is adjusted, while realizing output voltage
It is constant.
The invention discloses with power factor adjust function, critical conduction mode control switch power controller, and
And describe specific embodiment of the invention and effect with reference to the accompanying drawings.It is to be understood that above-described embodiment is to this hair
Bright explanation, rather than limitation of the present invention, any innovation and creation without departing from the range of true spirit, including mistake
Zero detection circuit, ON time length control circuit, flip-flop circuit etc., change to the local structure of circuit, to component
Type or model replacement, and other unsubstantialities replacement or modification, each fall within the scope of the present invention.
Claims (27)
1. a kind of switch power controller, it is characterised in that including：
Zero cross detection circuit, the feedback signal to being input into carries out zero passage detection and produces zero cross signal；
ON time detects circuit, and the ON time to the switching tube in Switching Power Supply is detected, is determined with obtaining ON time
When voltage；
Switch periods time detection circuit, the switch periods time to the switching tube is detected, to obtain during switch periods
Between timing voltage；
ON time length control circuit, with output end, the switch periods time detection circuit that the ON time detects circuit
Output end be connected, and receive offset voltage, according to the ON time timing voltage, switch periods time timing voltage and
Offset voltage produces cut-off signals, so that the ON time of the switching tube and the ON time timing voltage, switch periods
Time timing voltage is associated；
Drive signal generation circuit, drive signal, the drive signal transmission are produced according to the zero cross signal and cut-off signals
To the drive end of the switching tube, in response to the zero cross signal, the drive signal controls the switching tube conducting；In response to
The cut-off signals, the drive signal controls the switching tube shut-off；
Wherein, the cut-off signals that the ON time length control module is produced meet the ON time Ton of the switching tube
Following relation：VTon×Ton/VTKeep fixing, wherein, VTonIt is the ON time timing voltage, VTDuring for the switch periods
Between timing voltage.
2. switch power controller according to claim 1, it is characterised in that the voltage of the ON time timing voltage
Value is proportional to the ON time of the switching tube, and the switch periods time timing voltage is proportional to the switch week of the switching tube
Time phase, the cut-off signals that the ON time length control module is produced cause that the ON time is fixed with the ON time
When voltage increase and reduce, and increase with the increase of the switch periods time timing voltage.
3. switch power controller according to claim 1, it is characterised in that what the ON time detection circuit was obtained
ON time timing voltage represents ON time of the switching tube in previous switch periods, or represents the switching tube
The average value of the ON time within the preceding multiple switch cycle.
4. switch power controller according to claim 1, it is characterised in that the switch periods time detection circuit is obtained
To switch periods time timing voltage represent switch periods time of the switching tube in previous switch periods, Huo Zhebiao
Show the average value of switch periods time of the switching tube within the preceding multiple switch cycle.
5. switch power controller according to claim 1, it is characterised in that the ON time detects the input of circuit
End is directly connected to the drive end of the switching tube, is detected with the ON time to the switching tube.
6. switch power controller according to claim 1, it is characterised in that the switch periods time detection circuit
Input is directly connected to the drive end of the switching tube, is detected with the switch periods time to the switching tube.
7. switch power controller according to any one of claim 1 to 6, it is characterised in that also include：
Constant current counting circuit, samples to flowing through the primary current of switching tube of the Switching Power Supply, obtains primary side peak value electricity
Stream, and the transformer degaussing Time Calculation output current exported by the primary side peak point current and the zero cross detection circuit；
Error amplifier, error amplification is carried out to the output current that the constant current calculates circuit output with default reference current,
Output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
8. switch power controller according to any one of claim 1 to 6, it is characterised in that also include：
Voltage sampling circuit, the voltage to the output end of the Switching Power Supply is sampled, and obtains exporting sampled voltage；
Error amplifier, the sampled voltage to voltage sampling circuit output carries out error amplification with default reference voltage,
Output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
9. switch power controller according to any one of claim 1 to 6, it is characterised in that the drive signal is produced
Raw circuit includes：Rest-set flip-flop, its set input receives the zero cross signal, and its RESET input receives the shut-off letter
Number, its output end produces the drive signal.
10. switch power controller according to claim 9, it is characterised in that the drive signal generation circuit is also wrapped
Include：Driver, the drive signal is transmitted to the drive end of the switching tube via the driver.
11. switch power controllers according to any one of claim 1 to 6, it is characterised in that the ON time inspection
Slowdown monitoring circuit includes：
First current source；
First switch, its first end connects the output end of first current source；
Second switch, its first end connects the second end of the first switch, its second end ground connection；
First electric capacity, its first end connects the second end of the first switch and the first end of the second switch, its second end
Ground connection；
Voltage follower, its input connects the first end of first electric capacity；
3rd switch, its first end connects the output end of the voltage follower；
Second electric capacity, the second end of its first end connection the 3rd switch, its second end ground connection, the second of second electric capacity
The end output ON time timing voltage.
12. switch power controllers according to claim 11, it is characterised in that in response to switching tube conducting, institute
First switch conducting, the second switch and the 3rd switch OFF are stated, first current source charges to first electric capacity, makes
The voltage for obtaining the first electric capacity two ends is directly proportional to the ON time of the switching tube；In response to switching tube shut-off, institute
State first switch and second switch shut-off, the 3rd switch conduction, the voltage at the first electric capacity two ends be maintained and via
The voltage follower and the 3rd switch are transferred to second electric capacity；After switching tube shut-off Preset Time, institute
First switch and the 3rd switch OFF are stated, the second switch conducting, the voltage at the first electric capacity two ends resets, described second
Voltage on electric capacity remains unchanged.
13. switch power controllers according to any one of claim 1 to 6, it is characterised in that the ON time is long
Degree control circuit includes：
Second current source；
3rd electric capacity, its first end connects the output end of second current source, its second end ground connection；
4th switch, its first end connects the first end of the 3rd electric capacity, and its second end connects the second of the 3rd electric capacity
End；
Comparator, its first input end connects the first end of the 3rd electric capacity, and its second input receives default with reference to electricity
Pressure, its output end is used to export the cut-off signals.
14. a kind of Switching Power Supplies, it is characterised in that including switch power controller and coupled peripheral circuit, wherein,
The switch power controller includes：
Zero cross detection circuit, the feedback signal to being input into carries out zero passage detection and produces zero cross signal；
ON time detects circuit, and the ON time to the switching tube in Switching Power Supply is detected, is determined with obtaining ON time
When voltage；
Switch periods time detection circuit, the switch periods time to the switching tube is detected, to obtain during switch periods
Between timing voltage；
ON time length control circuit, with output end, the switch periods time detection circuit that the ON time detects circuit
Output end be connected, and receive offset voltage, according to the ON time timing voltage, switch periods time timing voltage and
Offset voltage produces cut-off signals, so that the ON time of the switching tube and the ON time timing voltage, switch periods
Time timing voltage is associated,
Drive signal generation circuit, drive signal, the drive signal transmission are produced according to the zero cross signal and cut-off signals
To the drive end of the switching tube, in response to the zero cross signal, the drive signal controls the switching tube conducting；In response to
The cut-off signals, the drive signal controls the switching tube shut-off；
Wherein, the cut-off signals that the ON time length control module is produced meet the ON time Ton of the switching tube
Following relation：VTon×Ton/VTKeep fixing, wherein, VTonIt is the ON time timing voltage, VTDuring for the switch periods
Between timing voltage.
15. Switching Power Supplies according to claim 14, it is characterised in that the magnitude of voltage of the ON time timing voltage is just
Than in the ON time of the switching tube, when the switch periods time timing voltage is proportional to the switch periods of the switching tube
Between, in response to ON time timing voltage increase, the cut-off signals that the ON time length control module is produced are caused
The ON time reduces, in response to switch periods time timing voltage increase, the ON time length control module
The cut-off signals of generation cause that the ON time increases.
16. Switching Power Supplies according to claim 14, it is characterised in that the conducting that the ON time detection circuit is obtained
Time timing voltage represents ON time of the switching tube in previous switch periods, or represents the switching tube preceding
The average value of the ON time in the multiple switch cycle.
17. Switching Power Supplies according to claim 14, it is characterised in that what the switch periods time detection circuit was obtained
Switch periods time timing voltage represents switch periods time of the switching tube in previous switch periods, or represents institute
State the average value of switch periods time of the switching tube within the preceding multiple switch cycle.
18. Switching Power Supplies according to claim 14, it is characterised in that the input of ON time detection circuit with
The drive end of the switching tube is directly connected to, and is detected with the ON time to the switching tube.
19. Switching Power Supplies according to claim 14, it is characterised in that the input of the switch periods time detection circuit
End is directly connected to the drive end of the switching tube, is detected with the switch periods time to the switching tube.
20. Switching Power Supply according to any one of claim 14 to 19, it is characterised in that the switch power controller
Also include：
Constant current counting circuit, samples to flowing through the primary current of switching tube of the Switching Power Supply, obtains primary side peak value electricity
Stream, and the transformer degaussing Time Calculation output current exported by the primary side peak point current and the zero cross detection circuit；
Error amplifier, error amplification is carried out to the output current that the constant current calculates circuit output with default reference current,
Output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
21. Switching Power Supply according to any one of claim 14 to 19, it is characterised in that the switch power controller
Also include：
Voltage sampling circuit, the voltage to the output end of the Switching Power Supply is sampled, and obtains exporting sampled voltage；
Error amplifier, the sampled voltage to voltage sampling circuit output carries out error amplification with default reference voltage,
Output error voltage, the error voltage is applied on loop compensation electric capacity to obtain the offset voltage.
22. Switching Power Supply according to any one of claim 14 to 19, it is characterised in that the drive signal produces electricity
Road includes：Rest-set flip-flop, its set input receives the zero cross signal, and its RESET input receives the cut-off signals, its
Output end produces the drive signal.
23. Switching Power Supplies according to claim 22, it is characterised in that the drive signal generation circuit also includes：Drive
Dynamic device, the drive signal is transmitted to the drive end of the switching tube via the driver.
24. Switching Power Supply according to any one of claim 14 to 19, it is characterised in that the ON time detection electricity
Road includes：
First current source；
First switch, its first end connects the output end of first current source；
Second switch, its first end connects the second end of the first switch, its second end ground connection；
First electric capacity, its first end connects the second end of the first switch and the first end of the second switch, its second end
Ground connection；
Voltage follower, its input connects the first end of first electric capacity；
3rd switch, its first end connects the output end of the voltage follower；
Second electric capacity, the second end of its first end connection the 3rd switch, its second end ground connection, the second of second electric capacity
The end output ON time timing voltage.
25. Switching Power Supplies according to claim 24, it is characterised in that in response to switching tube conducting, described first
Switch conduction, the second switch and the 3rd switch OFF, first current source charge to first electric capacity so that described
The voltage at the first electric capacity two ends is directly proportional to the ON time of the switching tube；In response to switching tube shut-off, described first
Switch and second switch shut-off, the 3rd switch conduction, the voltage at the first electric capacity two ends are maintained and via the electricity
Pressure follower and the 3rd switch are transferred to second electric capacity；After switching tube shut-off Preset Time, described first
Switch and the 3rd switch OFF, the second switch conducting, the voltage at the first electric capacity two ends resets, on second electric capacity
Voltage remain unchanged.
26. Switching Power Supply according to any one of claim 14 to 19, it is characterised in that the ON time length control
Circuit processed includes：
Second current source；
3rd electric capacity, its first end connects the output end of second current source, its second end ground connection；
4th switch, its first end connects the first end of the 3rd electric capacity, and its second end connects the second of the 3rd electric capacity
End；
Comparator, its first input end connects the first end of the 3rd electric capacity, and its second input receives default with reference to electricity
Pressure, its output end is used to export the cut-off signals.
27. Switching Power Supplies according to claim 14, it is characterised in that the peripheral circuit is reverse exciting topological or lifting
Pressure topology.
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| CN105048832A (en) * | 2015-06-18 | 2015-11-11 | 杭州士兰微电子股份有限公司 | Switch power supply controller and switch power supply including the switch power supply controller |
| CN106505841B (en) * | 2015-09-07 | 2018-04-20 | 比亚迪股份有限公司 | Switching Power Supply and its primary control chip and loop compensation device |
| CN106413172A (en) * | 2016-06-14 | 2017-02-15 | 深圳欧创芯半导体有限公司 | Buck-boost constant current circuit and output current sampling method thereof |
| CN110098735B (en) * | 2016-08-31 | 2020-10-09 | 杰华特微电子（杭州）有限公司 | Control method of switch circuit |
| CN106604460B (en) * | 2016-12-12 | 2018-10-09 | 深圳市必易微电子有限公司 | Constant-current circuit, constant-current controller and constant current control method |
| CN110829807B (en) * | 2018-08-13 | 2022-03-15 | 美芯晟科技(北京)股份有限公司 | THD compensation circuit, system and method |
| TWI704839B (en) * | 2019-08-16 | 2020-09-11 | 宏碁股份有限公司 | Driving device |
| CN114285398B (en) * | 2022-03-04 | 2022-05-27 | 南京沁恒微电子股份有限公司 | Capacitive charging type touch key detection circuit and detection method |
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| CN101505558B (en) * | 2008-02-04 | 2012-06-13 | 通嘉科技股份有限公司 | Light emission element driving circuit having compensation mechanism |
| JP5629191B2 (en) * | 2010-05-28 | 2014-11-19 | ルネサスエレクトロニクス株式会社 | Power supply |
| CN102958258B (en) * | 2012-11-19 | 2014-07-30 | 深圳市明微电子股份有限公司 | High power factor constant current driving circuit |
| CN103001463B (en) * | 2012-12-25 | 2016-05-25 | 杭州士兰微电子股份有限公司 | Switch power controller and the Switching Power Supply that comprises this switch power controller |
| CN104053270A (en) * | 2013-03-14 | 2014-09-17 | 凹凸电子（武汉）有限公司 | Light source drive circuit, and controller and method for controlling electric energy for light source |
| CN103475199B (en) * | 2013-09-13 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | For Harmonic Control Method and the control circuit of inverse-excitation type switch power-supply |
| CN103780231B (en) * | 2014-02-10 | 2017-10-20 | 绍兴光大芯业微电子有限公司 | Realize the circuit structure that peak value sampling is kept |
| CN204442169U (en) * | 2015-03-31 | 2015-07-01 | 杭州士兰微电子股份有限公司 | Switch power controller and comprise the Switching Power Supply of this switch power controller |
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