CN110380629A - Primary side feedback exchanges the quasi-resonance control circuit and device for turning direct-current switch power supply - Google Patents
Primary side feedback exchanges the quasi-resonance control circuit and device for turning direct-current switch power supply Download PDFInfo
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- CN110380629A CN110380629A CN201910481745.7A CN201910481745A CN110380629A CN 110380629 A CN110380629 A CN 110380629A CN 201910481745 A CN201910481745 A CN 201910481745A CN 110380629 A CN110380629 A CN 110380629A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
-
- 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 belongs to switch power technology fields, provide quasi-resonance control circuit and device that a kind of exchange of primary side feedback turns direct-current switch power supply, sampled signal is received by constant pressure and flow loop control unit and resonance wave paddy detecting unit, and control is carried out to loop and after resonance wave paddy detects respectively, the first trigger signal and the second trigger signal are exported to trigger the first trigger unit, and combine the output signal of current limiting unit to trigger the second trigger unit, and then it is transmitted to pulse frequency modulated unit and carries out pulse frequency adjustment, corresponding control signal is exported after eventually passing through driving unit, with the on or off of control switch module；Counting unit is counted according to the successive trigger sequence of the first trigger signal and the second trigger signal, and after being transmitted to converting unit progress digital-to-analogue conversion, to adjust the output signal of current limiting unit, so that loop maintains first trough or second trough is opened, it is thus achieved that highest efficiency and minimum electromagnetism interference performance.
Description
Technical field
The invention belongs to switch power technology fields, turn direct-current switch power supply more particularly to a kind of exchange of primary side feedback
Quasi-resonance control circuit and device.
Background technique
AC-DC control technology of primary side feedback mode is the new A C-DC control technology to grow up between nearest 20 years,
Compared with traditional secondary side feedback Switching Power Supply mechanism structure, maximum advantage be to eliminate isolating chip and be isolated
One group of component of chip cooperating reduces costs which offers a saving the space on circuit board and improves system
Reliability.Primary side feedback DC power supply is in the biggish application field of the cost pressures such as phone charger and LED drive power
There is the biggish market share Deng to the very high application field of volume requirement.
However, traditional primary side feedback exchange turn direct-current switch power supply can be with the decline of load, resonance amplitude is increasingly
Small, until detecting is less than resonance trough, such that the effect that quasi-resonance the lowest point is opened is greatly affected, load is got over
Gently, effect is poorer；And as load lightens, switch periods increase, and loop can only allow primary side the 2nd, 3,4 ..., N number of resonance
Trough is opened, and resonance amplitude is smaller and smaller, until resonance trough is detected due to too small less than system exits QR mode.
Therefore, existing primary side feedback exchange turns direct-current switch power supply technology in the presence of as load lightens, and loop can only allow
Primary side is the 2nd, 3,4 ..., and N number of resonance trough is opened, and resonance amplitude is smaller and smaller, until resonance trough is detected not due to too small
To the problem of.
Summary of the invention
The purpose of the present invention is to provide a kind of primary side feedback exchange turn direct-current switch power supply quasi-resonance control circuit and
Device, it is intended to solve existing primary side feedback exchange and turn direct-current switch power supply technology in the presence of as load lightens, loop can only allow
Primary side is the 2nd, 3,4 ..., and N number of resonance trough is opened, and resonance amplitude is smaller and smaller, until resonance trough is detected not due to too small
To the problem of.
First aspect present invention provides the quasi-resonance control circuit that a kind of exchange of primary side feedback turns direct-current switch power supply, institute
Stating quasi-resonance control circuit includes:
Power module is connect, the power supply signal for exporting to the power module carries out the rectification module of rectification processing；
It is connect with the rectification module, for rectification, treated after the power supply signal samples, output sampling
The sampling module of signal；
It is connect with the rectification module and the sampling module, for exporting corresponding control according to the sampled signal
The control module of signal；
It is connect with the control module, for carrying out the switch module of on or off according to the control signal；And
It is connect with the rectification module and the switch module, for when the switch module is connected, to rectification
Treated after the power supply signal carries out voltage transformation, the voltage changing module of output optimization power supply signal；
Wherein, the control module includes:
Constant pressure and flow loop control unit, resonance trough detecting unit, the first trigger unit, the second trigger unit, pulse
Frequency modulation unit, driving unit, current limiting unit, counting unit and converting unit；
Described in the input termination of the input terminal of the constant pressure and flow loop control unit and the resonance trough detecting unit
Sampling module, the output end of the constant pressure and flow loop control unit and the output end of the resonance trough detecting unit connect respectively
The first input end and the second input terminal of first trigger unit, second touching of the output termination of first trigger unit
The first input end of bill member, the output of the current limiting unit terminate the second input terminal of second trigger unit, and described the
The output of two trigger units terminates the input terminal of the pulse frequency modulated unit, the output end of the pulse frequency modulated unit
The input terminal of the driving unit is connect, the output of the driving unit terminates the switch module, and the counting unit connects described
The input terminal of converting unit, the output of the converting unit terminate the input terminal of the current limiting unit；
The constant pressure and flow loop control unit and the resonance trough detecting unit are used to receive the sampled signal, and
Control is carried out to loop respectively and after resonance wave paddy detects, exports the first trigger signal and the second trigger signal to trigger
The first trigger unit is stated, and in conjunction with the output signal of the current limiting unit to trigger second trigger unit, and then is transmitted to
The pulse frequency modulated unit carries out pulse frequency adjustment, exports the corresponding control after eventually passing through the driving unit
Signal, to control the on or off of the switch module；The counting unit is according to first trigger signal and described
The successive trigger sequence of two trigger signals is counted, and is transmitted to after the converting unit carries out digital-to-analogue conversion, to adjust
The output signal of current limiting unit is stated, so that the loop maintains first trough or second trough is opened.
Second aspect of the present invention provides the quasi-resonance control device that a kind of exchange of primary side feedback turns direct-current switch power supply,
It is characterized in that, including power module, further includes quasi-resonance control circuit as described above.
In conclusion the present invention provides a kind of primary side feedback exchange turn direct-current switch power supply quasi-resonance control circuit and
Device, including rectification module, sampling module, control module, switch module and voltage changing module, and be provided in the control module
Constant pressure and flow loop control unit, resonance trough detecting unit, the first trigger unit, the second trigger unit, pulse frequency modulated
Unit, driving unit, current limiting unit, counting unit and converting unit；Pass through constant pressure and flow loop control unit and resonance wave
Paddy detecting unit receives sampled signal, and carries out control to loop respectively and after resonance wave paddy detects, the first triggering of output
Signal and the second trigger signal combine the output signal of current limiting unit to trigger the second triggering list to trigger the first trigger unit
Member, and then be transmitted to pulse frequency modulated unit and carry out pulse frequency adjustment, corresponding control is exported after eventually passing through driving unit
Signal processed, with the on or off of control switch module；Counting unit is according to the elder generation of the first trigger signal and the second trigger signal
Trigger sequence is counted afterwards, and be transmitted to converting unit carry out digital-to-analogue conversion after, to adjust the output signal of current limiting unit, make
It obtains loop and maintains first trough or second trough unlatching.It is thus achieved that the primary side feedback of full input voltage range
Exchange turns direct-current switch power supply and works in medium load to full load, can open near two preceding resonance troughs, with reality
Existing highest efficiency and minimum electromagnetism interference performance so that system has better performance, therefore solve existing original
Side feedback communication, which turns direct-current switch power supply technology, to be existed as load lightens, and loop can only allow primary side the 2nd, 3,4 ..., N number of humorous
Vibration wave paddy is opened, and resonance amplitude is smaller and smaller, until resonance trough detected due to too small less than the problem of.
Detailed description of the invention
Fig. 1 is the quasi-resonance control circuit that a kind of primary side feedback exchange provided in an embodiment of the present invention turns direct-current switch power supply
Modular structure schematic diagram.
Fig. 2 is the quasi-resonance control circuit that a kind of primary side feedback exchange provided in an embodiment of the present invention turns direct-current switch power supply
Exemplary circuit figure.
Specific embodiment
In order to which technical problems, technical solutions and advantageous effects to be solved by the present invention are more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
A kind of primary side feedback exchange provided in an embodiment of the present invention turns the quasi-resonance control circuit and dress of direct-current switch power supply
It sets, including rectification module, sampling module, control module, switch module and voltage changing module, and is provided with perseverance in the control module
Press constant current loop control unit, resonance trough detecting unit, the first trigger unit, the second trigger unit, pulse frequency modulated list
Member, driving unit, current limiting unit, counting unit and converting unit；Pass through constant pressure and flow loop control unit and resonance wave paddy
Detecting unit receives sampled signal, and carries out control to loop respectively and after resonance wave paddy detects, output the first triggering letter
Number and the second trigger signal to trigger the first trigger unit, and combine the output signal of current limiting unit to trigger the second triggering list
Member, and then be transmitted to pulse frequency modulated unit and carry out pulse frequency adjustment, corresponding control is exported after eventually passing through driving unit
Signal processed, with the on or off of control switch module；Counting unit is according to the elder generation of the first trigger signal and the second trigger signal
Trigger sequence is counted afterwards, and be transmitted to converting unit carry out digital-to-analogue conversion after, to adjust the output signal of current limiting unit, make
It obtains loop and maintains first trough or second trough unlatching.Thus control module can be in input voltage or load variation
When, it all maintains first or second trough is opened；By the increase and decrease of counting unit digit, or per change long step by step
Change, so that control module is permanently retained in first or second in required load patch or input voltage section
Resonance trough is opened.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
Fig. 1 shows the quasi-resonance control that a kind of primary side feedback exchange provided in an embodiment of the present invention turns direct-current switch power supply
The modular structure of circuit, for ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
A kind of above-mentioned primary side feedback exchange turns the quasi-resonance control circuit of direct-current switch power supply, including rectification module 102, adopts
Egf block 103, control module 104, switch module 105 and voltage changing module 106.
Rectification module 102 connects power module 101, and the power supply signal for exporting to power module 101 carries out rectification processing.
Sampling module 103 is connect with rectification module 102, defeated for rectification, treated after power supply signal samples
Sampled signal out.
Control module 104 is connect with rectification module 102 and sampling module 103, for according to sampled signal, output to be corresponding
Control signal.
Switch module 105 is connect with control module 104, for carrying out on or off according to the control signal.
Voltage changing module 106 is connect with rectification module 102 and switch module 105, for being connected when switch module 105
When, after carrying out voltage transformation to rectification treated power supply signal, output optimization power supply signal.
Wherein, above-mentioned control module 104 includes constant pressure and flow loop control unit 1041, resonance trough detecting unit
1042, the first trigger unit 1043, the second trigger unit 1044, pulse frequency modulated unit 1045, driving unit 1046, current limliting
Unit 1047, counting unit 1048 and converting unit 1049.
The input of the input terminal and resonance trough detecting unit 1042 of constant pressure and flow loop control unit 1041, which terminates, to be sampled
The output end of module 103, the output end and resonance trough detecting unit 1042 of constant pressure and flow loop control unit 1041 connects respectively
The second triggering of output termination of the first input end and the second input terminal of first trigger unit 1043, the first trigger unit 1043 is single
The first input end of member 1044, the second input terminal of output the second trigger unit 1044 of termination of current limiting unit 1047, the second touching
The input terminal of the output termination pulse frequency modulated unit 1045 of bill member 1044, the output end of pulse frequency modulated unit 1045
The input terminal of driving unit 1046 is connect, the output of driving unit 1046 terminates switch module 105, and it is single that counting unit 1048 connects conversion
The input terminal of member 1049, the input terminal of the output termination current limiting unit 1047 of converting unit 1049.
Constant pressure and flow loop control unit 1041 and resonance wave paddy detecting unit 1042 are for receiving sampled signal, and difference
Control is carried out to loop and after resonance wave paddy detects, exports the first trigger signal and the second trigger signal to trigger the first touching
Bill member 1043, and combine the output signal of current limiting unit 1047 to trigger the second trigger unit 1044, and then be transmitted to pulse
Frequency modulation unit 1045 carries out pulse frequency adjustment, exports corresponding control signal after eventually passing through driving unit 1046, with
The on or off of control switch module 105；Counting unit 1048 is successive according to the first trigger signal and the second trigger signal
Trigger sequence is counted, and be transmitted to converting unit 1049 carry out digital-to-analogue conversion after, to adjust the output of current limiting unit 1047
Signal, so that loop maintains first trough or second trough is opened.
As an embodiment of the present invention, since counting unit 1048 and converting unit 1049 being arranged in control module 104,
So that control module 104 can all maintain first when input voltage perhaps loads variation or second trough is opened；It is logical
The increase and decrease of 1048 digit of counting unit is crossed, it perhaps can be in required load patch or input voltage per variation long step by step
Section neatly makes control module be permanently retained in first or second resonance trough unlatching.
Fig. 2 shows the quasi-resonance controls that a kind of primary side feedback exchange provided in an embodiment of the present invention turns direct-current switch power supply
The exemplary circuit of circuit, for ease of description, only parts related to embodiments of the present invention are shown, and details are as follows:
As an embodiment of the present invention, above-mentioned counting unit 1048 includes 5 bidirectional counters, 5 bidirectional counters
The output end of input termination 1042,5 bidirectional counters of constant pressure and flow loop control unit 1041 and resonance wave paddy detecting unit
Connect converting unit 1049.
Specifically, above-mentioned 5 bidirectional counters be used in predetermined period, when the first trigger signal first then, counted
Number plus 1 processing；When the second trigger signal first then, carry out counting the processing that subtracts 1.
As an embodiment of the present invention, above-mentioned converting unit 1049 includes 5 analog-digital converters, 5 analog-digital converters
The output of input termination 1048,5 analog-digital converters of counting unit terminates current limiting unit 1047.
As an embodiment of the present invention, above-mentioned rectification module 102 is realized using rectifier bridge, including full rectifier bridge or half whole
Flow bridge.
As an embodiment of the present invention, above-mentioned sampling module 103 includes the first sampling resistor R1 and the second sampling resistor R2；
The first termination rectification module 102 of first sampling resistor R1, the second end of the first sampling resistor R1 and the second sampling
The first end of resistance R2 connects altogether and connect with control module 104, the second end ground connection of the second sampling resistor R2.
As an embodiment of the present invention, above-mentioned control module 104 is realized using control chip U4.
As an embodiment of the present invention, above-mentioned switch module 105 includes switching tube (Fig. 2 is indicated using field-effect tube M1),
The input of switching tube terminates voltage changing module 106, and the output of the controlled termination driving unit 1046 of switching tube, switching tube terminates current limliting
Unit 1047.
Specifically, switching tube includes field-effect tube or triode；
Drain electrode, grid and the source electrode of field-effect tube are respectively the input terminal, controlled end and output end of switching tube；
Collector, base stage and the emitter of triode are respectively the input terminal, controlled end and output end of switching tube.
As an embodiment of the present invention, above-mentioned voltage changing module 106 is realized using transformer T1, transformer T1 include primary side around
The first termination rectification module 102 of group Np, auxiliary winding Na and secondary windings Ns, primary side winding Np, the of primary side winding Np
Two termination switch modules 105, the first termination sampling module 103 of auxiliary winding Na, the second end ground connection of auxiliary winding Na are secondary
Winding Ns connects output loading.
As an embodiment of the present invention, above-mentioned first trigger unit 1043 and the second trigger unit 1044 are all made of RS triggering
Device is realized.
As an embodiment of the present invention, above-mentioned driving unit 1046 is realized using driving chip.
As an embodiment of the present invention, above-mentioned current limiting unit 1047 includes Cycle by Cycle current limiter, and the of Cycle by Cycle current limiter
One input termination switch module 105, the second input terminal of Cycle by Cycle current limiter connect converting unit 1049, Cycle by Cycle current limiter it is defeated
The second trigger unit 1044 is terminated out.
As an embodiment of the present invention, above-mentioned constant pressure and flow control unit 1041, resonance trough detecting unit 1042 and
Pulse frequency modulated unit 1045 is all made of existing circuit element and realizes.
As an embodiment of the present invention, above-mentioned control module 104 further includes built-in power supply 1141, and built-in power supply 1141 is used for
Control module 104 is powered.The power supply signal that rectification module 102 exports is after the 4th resistance R4 is divided, transmission
To the built-in power supply 1141 of control module 104.
Another aspect of the present invention additionally provides the quasi-resonance control device that a kind of exchange of primary side feedback turns direct-current switch power supply,
It further include quasi-resonance control circuit as described above including power module 101.
Specifically, above-mentioned power module 101 includes the AC power source for having preset voltage value, and the range of preset voltage value is
40V~220V, certainly, power module 101 are not limited to AC power source, use DC power supply can also be with.
The quasi-resonance control circuit that turns direct-current switch power supply is exchanged below in conjunction with Fig. 1 and Fig. 2 a kind of above-mentioned primary side feedback
And the working principle of device is described as follows:
In the primary side feedback AC-DC power supply constituted using control chip U4, the sampling electricity of the first sampling resistor R1 and second
R2 composition sample circuit is hindered, the FB pin of control chip U4 is auxiliary winding Na Voltage Feedback introducing foot, and electric from the first sampling
Resistance R1 and the second sampling resistor R2 is constituted in sample circuit and is obtained signal.Inside control chip U4, FB pin is connected to constant pressure
Constant current loop control unit 1041 is used to adjust the work of control chip U4 according to the size of output voltage or output electric current
Frequency, at the same as resonance trough detect pin, for detecting secondary side demagnetization after resonance trough, CS pin be primary side around
Group Np current detection signal introduces foot, obtains signal from NMOS tube source electrode 3rd resistor R3, and inside control chip U4, CS draws
Foot is connected to the input terminal of current limiting unit 1047.The output end (Loop) of constant pressure and flow loop control unit 1041 and resonance wave paddy
The output end (Valley) of detecting unit 1042 is connected respectively to the end R and the end S of rest-set flip-flop 1043, opens for quasi-resonance,
When Loop signal allows to open, control chip U4 will wait the arrival of next trough signal Valley that could open,
If detecting is opened after fixed delay less than trough signal；The output end Q (i.e. ON signal) of rest-set flip-flop 1043 is even
The end S for connecing another rest-set flip-flop 1044, the open signal as this period；And the output end OCP signal of current limiting unit 1047
It is connected to the end R of another rest-set flip-flop 1044, the pass segment signal as this period.The output end of another rest-set flip-flop 1044
I.e. the end the Q input terminal that is connected to pulse frequency modulated unit 1045, pulse frequency modulated unit 1045 are connected to driving unit
1046, the output end of driving unit 1046 is connect with the OUT pin of control chip U4, and OUT pin exports the grid for being connected to NMOS tube
Pole, for driving external power NMOS tube.VCC pin is the power pins for controlling chip U4, for controlling chip to be entire
U4 accesses external power supply；CS is primary side winding Np current sense pin, for detecting peak point current when primary side winding Np conducting,
To realize the Cycle by Cycle current limliting in each periodic process, so that the energy of each periodic transfer is all the same；GND is connecing for chip
Ground pin.When the systems are operating normally, since the polarity of transformer T1 primary winding Np is with respect to auxiliary winding Na and secondary windings
For Ns Same Name of Ends on the contrary, therefore when primary side winding Np is connected, FB pin is negative voltage；When in secondary windings Ns conducting phase
When, since auxiliary winding Na is identical as secondary windings Ns Same Name of Ends polarity, FB voltage is positive voltage, at this time transformer secondary
Winding voltage is Vs=Vo+Vz, auxiliary winding voltage Va=Vs × (NA/NS)=VFB × R2/ (R1+R2), therefore Vo=VFB
× R2 × NS/ [(R1+R2) * NA]-Vz, that is, output voltage are the functions of feedback voltage V FB, and chip passes through constant pressure and flow ring
Road control unit 1041 adjusts VFB to setting value, that is, may make output voltage Vo to stablize in setting value, system work at this time exists
Constant voltage mode；When system work is in constant current mode, secondary side turn-on time detection unit can be positive voltage by detecting FB pin
Time determine the turn-on time Tons of secondary windings Ns, and on this basis come determine the duty cycle T=K of system ×
Tons, wherein K is proportionality coefficient.Since system works in discontinuous mode, each period is intended to the energy for storing primary side winding Np
Amount all in secondary windings Ns release, average output current Iout=Ips × Tons/T=Ipp of such secondary windings Ns ×
(NS/NP) × (1/K), Ips are peak point current when secondary windings Ns is connected, and Ipp is peak value electricity when primary side winding Np is connected
Stream, Ns are the circle number of secondary windings Ns, and Np is the circle number of primary side winding Np.As long as setting Ipp and K and transformer ginseng in this way
Number, then the output electric current of secondary windings Ns is exactly a steady state value.
Also, it joined 5 digit of bidirectional counter 1048 and 5 mode converters 1049 in control chip U4；Work as work
In some period, the constant pressure and constant flow control signals Loop of first resonance trough signal Valley ratio control chip U4 arrives first
When, then control chip U4 can only could be opened in next resonance trough after Loop arrival, it cannot be in first resonance wave
Paddy is opened；But 5 bidirectional counters 1048 will do it " -1 " movement at this time, then the output of 5 digit mode converters 1049 is just
A step (taking a step here is the 2% of current CS value, in order to understand) can be declined, so that Cycle by Cycle Current-Limiting Comparator
1047 reference voltage decline 2%, then the CS threshold value of next cycle only has the 98% of this period；Next period primary side peak value
Electric current Ipp also only has the 98% of this period, and the energy that next cycle control chip U4 exports transmitting outward is P=0.5*
(0.98*Ipp) 2*Lp=0.9604*0.5* (Ipp) 2*Lp, Ipp are this period primary side peak point current；Namely next period passes
Defeated energy is only the 96.04% of this period, and since output loading does not change, the energy of each periodic transfer is small, the period
Time T will shorten, therefore system constant pressure and flow loop, for the output loading that remains unchanged, next period can shorten to this week
It is secondary after the 96.04% of phase, that is, constant pressure and flow signal can shift to an earlier date 4%*T than the last period and will arrive, and Ipp reduces 2%
The resonance that the side erasing time can also reduce after 2%, that is, demagnetization can shift to an earlier date the 2%*T time and start；The so next period from
After Valley arrives, 2%*T will be shortened until the waiting time that Loop signal arrives；Then since Valley is arrived first, Loop
After arrive, CS threshold value continues to zoom out, under the next period, Loop will continue to 2%*T in advance time arrive, in this way until some period
Loop ratio Valley is arrived first, so that control chip U4 is opened in first resonance trough.
So, when than first Valley of Loop first when, control chip U4 opened in first resonance trough；At this time 5
Position bidirectional counter 1048 will do it "+1 " movement, then the output of 5 digit mode converters 1049 will rise step (this
In take a step be current CS value 2%, in order to understand) so that the reference voltage of Cycle by Cycle Current-Limiting Comparator rises
2%, then the CS threshold value of next cycle becomes the 102% of this period, the Loop signal in period next in this way will be opposite
Ground postpone 2%*T time just arrive, repeatedly until than first Valley signal of Loop it is slow, control chip at this time
U4 is opened in second trough, while 5 bidirectional counters 1048 will do it " -1 " movement again；Final Loop signal can be by repeatedly
It arrives before first and second trough signal, so that control chip U4 is forever repeatedly at first or second
Trough is opened.
Therefore, direct-current switch power supply is turned to the exchange of the primary side feedback of full input voltage range and works in medium load to being fully loaded with
When, it can be opened near two preceding resonance troughs, so that system has better performance.
In conclusion the embodiment of the invention provides the quasi-resonance controls that a kind of exchange of primary side feedback turns direct-current switch power supply
Circuit and device, including rectification module, sampling module, control module, switch module and voltage changing module, and in the control module
Provided with constant pressure and flow loop control unit, resonance trough detecting unit, the first trigger unit, the second trigger unit, pulse frequency
Rate modulation unit, driving unit, current limiting unit, counting unit and converting unit；By constant pressure and flow loop control unit and
Resonance trough detecting unit receives sampled signal, and carries out control to loop respectively and after resonance wave paddy detects, output the
One trigger signal and the second trigger signal combine the output signal of current limiting unit to trigger second to trigger the first trigger unit
Trigger unit, and then be transmitted to pulse frequency modulated unit and carry out pulse frequency adjustment, eventually pass through output pair after driving unit
The control signal answered, with the on or off of control switch module；Counting unit is believed according to the first trigger signal and the second triggering
Number successive trigger sequence counted, and be transmitted to converting unit carry out digital-to-analogue conversion after, to adjust the output of current limiting unit
Signal, so that loop maintains first trough or second trough is opened.It is thus achieved that full input voltage range
Primary side feedback exchange turns direct-current switch power supply and works in medium load to full load, can open near two preceding resonance troughs
It opens, to realize highest efficiency and minimum electromagnetism interference performance, so that system has better performance, therefore solves existing
With the presence of primary side feedback exchange turn direct-current switch power supply technology as load lightens, loop can only allow primary side the 2nd, 3,
4 ..., N number of resonance trough is opened, and resonance amplitude is smaller and smaller, until resonance trough detected due to too small less than the problem of.
Those of ordinary skill in the art will appreciate that: the step of realizing above method embodiment or part steps can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed, and storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and model of each embodiment technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. the quasi-resonance control circuit that a kind of primary side feedback exchange turns direct-current switch power supply, which is characterized in that the quasi-resonance control
Circuit processed includes:
Power module is connect, the power supply signal for exporting to the power module carries out the rectification module of rectification processing；
It is connect with the rectification module, for treated after the power supply signal samples to rectification, exports sampled signal
Sampling module；
It is connect with the rectification module and the sampling module, for exporting corresponding control signal according to the sampled signal
Control module；
It is connect with the control module, for carrying out the switch module of on or off according to the control signal；And
It is connect with the rectification module and the switch module, for handling rectification when the switch module is connected
After the power supply signal afterwards carries out voltage transformation, the voltage changing module of output optimization power supply signal；
Wherein, the control module includes:
Constant pressure and flow loop control unit, resonance trough detecting unit, the first trigger unit, the second trigger unit, pulse frequency
Modulation unit, driving unit, current limiting unit, counting unit and converting unit；
The input of the input terminal of the constant pressure and flow loop control unit and the resonance trough detecting unit terminates the sampling
The output end of module, the output end of the constant pressure and flow loop control unit and the resonance trough detecting unit connects described respectively
The first input end of first trigger unit and the second input terminal, second triggering of the output termination of first trigger unit are single
The first input end of member, the output of the current limiting unit terminate the second input terminal of second trigger unit, second touching
The output of bill member terminates the input terminal of the pulse frequency modulated unit, and the output of the pulse frequency modulated unit terminates institute
The input terminal of driving unit is stated, the output of the driving unit terminates the switch module, and the counting unit connects the conversion
The input terminal of unit, the output of the converting unit terminate the input terminal of the current limiting unit；
The constant pressure and flow loop control unit and the resonance trough detecting unit are for receiving the sampled signal, and difference
Control is carried out to loop and after resonance wave paddy detects, exports the first trigger signal and the second trigger signal to trigger described the
One trigger unit, and in conjunction with the output signal of the current limiting unit to trigger second trigger unit, and then be transmitted to described
Pulse frequency modulated unit carries out pulse frequency adjustment, exports the corresponding control letter after eventually passing through the driving unit
Number, to control the on or off of the switch module；The counting unit is according to first trigger signal and described second
The successive trigger sequence of trigger signal is counted, and is transmitted to after the converting unit carries out digital-to-analogue conversion, described in adjusting
The output signal of current limiting unit, so that the loop maintains first trough or second trough is opened.
2. quasi-resonance control circuit as described in claim 1, which is characterized in that the counting unit includes 5 two-way countings
Device,
The input of 5 bidirectional counters terminates the constant pressure and flow loop control unit and resonance trough detecting is single
The output of member, 5 bidirectional counters terminates the converting unit；
5 bidirectional counters are used in predetermined period, when first trigger signal first then, the place that carries out that count is incremented
Reason；When second trigger signal first then, count the processing that subtracts 1.
3. quasi-resonance control circuit as described in claim 1, which is characterized in that the converting unit includes 5 analog-to-digital conversions
Device,
The input of 5 analog-digital converters terminates the counting unit, and the output of 5 analog-digital converters terminates the limit
Flow unit.
4. quasi-resonance control circuit as described in claim 1, which is characterized in that the sampling module includes:
First sampling resistor and the second sampling resistor；
The first termination rectification module of first sampling resistor, the second end of first sampling resistor and described second
The first end of sampling resistor connects altogether and connect with the control module, the second end ground connection of second sampling resistor.
5. quasi-resonance control circuit as described in claim 1, which is characterized in that the control module is real using control chip
It is existing.
6. quasi-resonance control circuit as described in claim 1, which is characterized in that the switch module includes switching tube,
The input of the switching tube terminates the voltage changing module, and the controlled termination driving unit of the switching tube is described to open
The output for closing pipe terminates the current limiting unit.
7. quasi-resonance control circuit as described in claim 1, which is characterized in that the voltage changing module is realized using transformer.
8. quasi-resonance control circuit as described in claim 1, which is characterized in that first trigger unit and the triggering are single
Member is all made of rest-set flip-flop realization.
9. quasi-resonance control circuit as described in claim 1, which is characterized in that the driving unit is real using driving chip
It is existing.
10. the quasi-resonance control device that a kind of primary side feedback exchange turns direct-current switch power supply, which is characterized in that including power supply mould
Block further includes such as the described in any item quasi-resonance control circuits of the claims 1-9.
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| CN201910481745.7A CN110380629B (en) | 2019-06-04 | 2019-06-04 | Quasi-resonance control circuit and device for primary side feedback AC-DC switching power supply |
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| CN201910481745.7A CN110380629B (en) | 2019-06-04 | 2019-06-04 | Quasi-resonance control circuit and device for primary side feedback AC-DC switching power supply |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884494A (en) * | 2020-07-23 | 2020-11-03 | 成都启臣微电子股份有限公司 | Quasi-resonance valley bottom conduction circuit with compensation function |
| CN112542954A (en) * | 2020-12-16 | 2021-03-23 | 南京微盟电子有限公司 | Adaptive soft drive control circuit suitable for DCM |
| CN112564511A (en) * | 2020-12-16 | 2021-03-26 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit suitable for CCM |
| CN112737339A (en) * | 2020-12-16 | 2021-04-30 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490636A (en) * | 2012-06-11 | 2014-01-01 | 比亚迪股份有限公司 | Quasi-resonant control method, quasi-resonant system and quasi-resonant device for switching power supplies |
| CN103944374A (en) * | 2014-04-25 | 2014-07-23 | 矽力杰半导体技术(杭州)有限公司 | PFC constant-voltage driving control circuit for primary side feedback and control method |
| US20160006358A1 (en) * | 2014-07-01 | 2016-01-07 | National Taiwan University | Control circuit |
| US20160301317A1 (en) * | 2015-04-13 | 2016-10-13 | Magnachip Semiconductor, Ltd. | Pulse-width modulation (pwm) controlling apparatus for flyback converter |
| CN106655834A (en) * | 2016-10-08 | 2017-05-10 | 成都启臣微电子股份有限公司 | Quasi-resonant primary-side constant-current control circuit and alternating current-direct current converter with the circuit |
| US20170250612A1 (en) * | 2014-11-27 | 2017-08-31 | Dialog Semiconductor Inc. | Isolated Switching Power Converter with Data Communication between Primary and Secondary Sides |
-
2019
- 2019-06-04 CN CN201910481745.7A patent/CN110380629B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490636A (en) * | 2012-06-11 | 2014-01-01 | 比亚迪股份有限公司 | Quasi-resonant control method, quasi-resonant system and quasi-resonant device for switching power supplies |
| CN103944374A (en) * | 2014-04-25 | 2014-07-23 | 矽力杰半导体技术(杭州)有限公司 | PFC constant-voltage driving control circuit for primary side feedback and control method |
| US20160006358A1 (en) * | 2014-07-01 | 2016-01-07 | National Taiwan University | Control circuit |
| US20170250612A1 (en) * | 2014-11-27 | 2017-08-31 | Dialog Semiconductor Inc. | Isolated Switching Power Converter with Data Communication between Primary and Secondary Sides |
| US20160301317A1 (en) * | 2015-04-13 | 2016-10-13 | Magnachip Semiconductor, Ltd. | Pulse-width modulation (pwm) controlling apparatus for flyback converter |
| CN106655834A (en) * | 2016-10-08 | 2017-05-10 | 成都启臣微电子股份有限公司 | Quasi-resonant primary-side constant-current control circuit and alternating current-direct current converter with the circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884494A (en) * | 2020-07-23 | 2020-11-03 | 成都启臣微电子股份有限公司 | Quasi-resonance valley bottom conduction circuit with compensation function |
| CN111884494B (en) * | 2020-07-23 | 2021-11-12 | 成都启臣微电子股份有限公司 | Quasi-resonance valley bottom conduction circuit with compensation function |
| CN112542954A (en) * | 2020-12-16 | 2021-03-23 | 南京微盟电子有限公司 | Adaptive soft drive control circuit suitable for DCM |
| CN112564511A (en) * | 2020-12-16 | 2021-03-26 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit suitable for CCM |
| CN112737339A (en) * | 2020-12-16 | 2021-04-30 | 南京微盟电子有限公司 | Self-adaptive soft drive control circuit |
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|---|---|
| CN110380629B (en) | 2020-06-16 |
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