CN108347173A - Quasi-resonance inverse-excitation type switch power-supply system - Google Patents
Quasi-resonance inverse-excitation type switch power-supply system Download PDFInfo
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- CN108347173A CN108347173A CN201810306947.3A CN201810306947A CN108347173A CN 108347173 A CN108347173 A CN 108347173A CN 201810306947 A CN201810306947 A CN 201810306947A CN 108347173 A CN108347173 A CN 108347173A
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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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Disclose a kind of quasi-resonance inverse-excitation type switch power-supply system, including transformer, power switch and the quasi resonant control including trembling frequency module and the lowest point control module.Tremble the switching frequency that frequency module is switched by adjusting the peak point current for the armature winding for flowing through transformer come regulation power, the switching frequency either switched come regulation power by the resonance the lowest point of the drain voltage in power switch addition lead or retardation；The lowest point control module is switched to conducting state in the predetermined resonance the lowest point of its drain voltage according to increasing the lowest point signal and reducing the lowest point signal control power switch by obtaining increasing the lowest point signal after carrying out operation, processing with the first reference frequency, the magnitude relationship of the second reference frequency to the switching frequency of power switch and the frequency and reducing the lowest point signal from off state.
Description
Technical field
The present invention relates to circuit fields, relate more specifically to a kind of quasi-resonance inverse-excitation type switch power-supply system.
Background technology
Fig. 1 shows the schematic diagram of traditional quasi-resonance inverse-excitation type switch power-supply system.Fig. 2 shows systems shown in FIG. 1
Drain voltage Vd, the grid voltage Vg of power switch S1 in system and flow through transformer T armature winding electric current Ip wave
Shape figure, wherein Ton is the turn-on time of power switch S1, and Toff is the turn-off time of power switch S1.As shown in Fig. 2, in work(
When rate switch S1 is off state, after the main inductance Lp demagnetizations of transformer T, the main inductance Lp and power of transformer T
The parasitic capacitance Cp free harmonic vibrations of switch S1.At this point, the quasi resonant control in system shown in FIG. 1 can be in power switch S1
Drain voltage resonance the lowest point control power switch S1 be switched to conducting state from off state, to reduce system shown in FIG. 1
Switching loss and electromagnetic interference (EMI) in system.It is made of the parasitic capacitance Cp of the main inductance Lp of transformer T and power switch S1
LC resonance chamber harmonic period it is smaller relative to the switch periods of power switch S1, so system approximation shown in FIG. 1 is in work
Make in critical conduction mode.
In the system shown in figure 1, system output power and system operating frequency (that is, switching frequency of power switch S1)
It can be expressed as equation (1) and equation (2)：
In equation (1) and equation (2), POUTIt is system output power, fSIt is system operating frequency, η is that system power turns
Change efficiency, VOUTIt is system output voltage (that is, secondary output voltage of transformer T), Vin_DCIt is system input voltage (that is, line is defeated
Enter rectified voltage), IPKIt is the peak point current (that is, flowing through the peak point current of power switch S1) for the armature winding for flowing through transformer T,
N is the armature winding of transformer T and the turn ratio of secondary windings, VFIt is the pressure of the rectifier diode D1 of the primary side of transformer T
Drop, D is the turn-on time duty ratio of power switch S1.
From equation (1) and equation (2) it is found that in the case of system output power and constant system input voltage, system
Working frequency is basically unchanged.So EMI when system shown in FIG. 1 is operated in critical conduction mode can be poor in low-frequency range.
Fig. 3 shows the schematic diagram of the quasi resonant control in system shown in FIG. 1.As shown in figure 3, quasi resonant control
FB terminals receive it is that error amplification is generated with isolation module based on system output voltage or system output current, for characterizing system
The output voltage or current feedback signal of system output voltage or system output current；The CS terminals reception of quasi resonant control is flowed through
It is that the electric current of the armature winding of transformer T generates on current sensing resistor Rsense, for characterizing the primary for flowing through transformer T
The primary winding current of the electric current of winding characterizes signal；Pulsewidth modulation (Pulse Width Modulation, PWM) is compared
Leading for power switch S1 is controlled based on output voltage or ammeter reference number and primary winding current characterization signal compared with device
Logical and shutdown, to control system output voltage or system output current.
In order to improve EMI when system shown in FIG. 1 is operated in critical conduction mode, system operating frequency cannot collect very much
In, it is therefore desirable to realize the shake of system operating frequency.Here, system operating frequency can also be expressed as equation (3)：
In equation (3), system input voltage Vin_DC, transformer T armature winding and secondary windings turn ratio N, with
And the pressure drop V of the rectifier diode D1 of the primary side of transformer TFIt is systematic parameter.From equation (3) it is found that system work frequency
Rate and the peak point current for the armature winding for flowing through transformer T are inversely proportional.Therefore, can by flow through transformer T it is primary around
The peak point current of group is disturbed to realize the shake of system operating frequency.
When Fig. 4 shows realization triangular wave frequency dither arrangement in the system shown in figure 1, the primary of transformer T is flowed through
The peak point current I of windingPKWith system operating frequency fSOscillogram.Fig. 5 is shown realizes pseudorandom in the system shown in figure 1
When frequency jitter scheme, the peak point current I of the armature winding of transformer T is flowed throughPKWith system operating frequency fSOscillogram.
As shown in Figure 4 and Figure 5, system operating frequency fSWith the peak point current I for the armature winding for flowing through transformer TPKAt anti-
The relationship of ratio.As peak point current IPKChattering frequency be much larger than system loop bandwidth when, can by flow through transformer T just
The peak point current I of grade windingPKAdjusting realize to system operating frequency fSAdjusting, wherein flow through transformer T it is primary around
The peak point current I of groupPKCyclically-varying can lead to the cyclically-varying of system operating frequency.
Except through the peak point current I of the armature winding to flowing through transformer TPKIt is disturbed to realize system operating frequency
Shake outside, can also realize system operating frequency f by the way that certain amplitude, variation delay is added in loopSTremble
It is dynamic.For example, in the drain voltage of power switch S1 at the time of power switch S1 can be allowed to be switched to conducting state from off state
Resonance the lowest point near a bit of time range in variation.Fig. 6 is shown realizes control delay frequency in the system shown in figure 1
When rate dither arrangement, the drain voltage Vd and system operating frequency f of power switch S1SOscillogram.It is opened compared to control power
The resonance valley conduction that S1 is fixed on drain voltage Vd is closed, control delay frequency jitter scheme shown in fig. 6 can be to a certain degree
The upper efficiency for reducing system shown in FIG. 1.But as long as controlling the amplitude of delay, so that it may with the effect of system shown in FIG. 1
The rate damage control is within the acceptable range.
In many application scenarios, the working frequency of quasi-resonance inverse-excitation type switch power-supply system can be limited in a certain range
Within.For there is the quasi-resonance inverse-excitation type switch power-supply system for trembling frequency, when the upper limiting frequency of the close setting of system operating frequency
Or when lower frequency limit, it has been superimposed the system operating frequency after trembling frequency and has been possible to fall other than scheduled frequency separation, so as to
In the several adjacent humorous of its drain voltage at the time of power switch therein can be caused to be switched to conducting state from off state
It shakes and beats repeatedly between the lowest point.This bounce repeatedly can lead to system output voltage or electric current and system output voltage or electric current
Feedback signal fluctuates, and becomes larger so as to cause system output ripple.In addition, when huge fluctuation occurs in system operating frequency,
Falling the frequency component in audio zone can also become more, so that system noise index can also deteriorate significantly.
Invention content
In view of problems described above one or more, frequency jitter and the lowest point control are combined the present invention provides a kind of
Quasi-resonance inverse-excitation type switch power-supply system.
Quasi-resonance inverse-excitation type switch power-supply system according to the ... of the embodiment of the present invention, including transformer, power switch and packet
Include the quasi resonant control for trembling frequency module and the lowest point control module.Tremble the armature winding that frequency module flows through transformer by adjusting
Peak point current carrys out the switching frequency of regulation power switch, or is carried by the resonance the lowest point addition of the drain voltage in power switch
Preceding amount or retardation carry out the switching frequency of regulation power switch；The lowest point control module by the switching frequency to power switch into
Line frequency/voltage be converted to reflection power switch switching frequency first voltage signal, by first voltage signal into
Row integral is filtered and filters out burr or high frequency components therein and obtain second voltage signal, by by second voltage signal point
Life is not compared with the second reference voltage of the second reference frequency of the first reference voltage of the first reference frequency of reflection and reflection
At increase the lowest point signal and the lowest point signal is reduced, and power switch is controlled at it according to the lowest point signal and reduction the lowest point signal is increased
The predetermined resonance the lowest point of drain voltage is switched to conducting state from off state, or by dividing the switching frequency of power switch
It is not compared with the first reference frequency and the second reference frequency and generates first frequency comparator output signal and second frequency ratio
Compared with device output signal, by being integrated respectively to first frequency comparator output signal and second frequency comparator output signal
Or be filtered, it filters out first frequency comparator output signal and burr in second frequency comparator output signal or high frequency is disturbed
It is dynamic, it obtains increasing the lowest point signal and reduces the lowest point signal, and opened according to increasing the lowest point signal and reducing the lowest point signal control power
It closes and is switched to conducting state from off state in the predetermined resonance the lowest point of its drain voltage.
Quasi-resonance inverse-excitation type switch power-supply system according to the ... of the embodiment of the present invention can solve traditional quasi-resonance inverse-excitation type
The EMI problems of switch power supply system, while also avoiding there are the quasi-resonance inverse-excitation type switch power-supply systems of frequency limits
In because introducing tremble the problem of system output ripple and noise become larger caused by frequency.
Description of the drawings
From below in conjunction with the accompanying drawings to the present invention specific implementation mode description in the present invention may be better understood,
In：
Fig. 1 shows the schematic diagram of traditional quasi-resonance inverse-excitation type switch power-supply system；
Fig. 2 shows the drain voltage Vd of the power switch S1 in system shown in FIG. 1, grid voltage Vg and flow through
The oscillogram of the electric current Ip of the armature winding of transformer T；
Fig. 3 shows the schematic diagram of the quasi resonant control in system shown in FIG. 1；
When Fig. 4 shows realization triangular wave frequency dither arrangement in the system shown in figure 1, the primary of transformer T is flowed through
The peak point current I of windingPKWith system work work(frequency fSOscillogram；
When Fig. 5 has gone out to realize pseudo-random frequency dither arrangement in the system shown in figure 1, flow through transformer T it is primary around
The peak point current I of groupPKWith system operating frequency fSOscillogram；
When Fig. 6 shows realization control delay frequency jitter scheme in the system shown in figure 1, the drain electrode of power switch S1
Voltage Vd and system operating frequency fSOscillogram；
Fig. 7 shows the schematic diagram for the quasi resonant control according to the ... of the embodiment of the present invention that can apply system shown in FIG. 1；
Fig. 8 shows the original for the quasi resonant control according to another embodiment of the present invention that can apply system shown in FIG. 1
Reason figure；
Fig. 9 shows the original for the quasi resonant control according to further embodiment of this invention that can apply system shown in FIG. 1
Reason figure；
Figure 10, which is shown, can be applied to Fig. 7 to the lowest point according to the ... of the embodiment of the present invention of quasi resonant control shown in Fig. 9
The schematic diagram of control module；
Figure 11 shows that can be applied to Fig. 7 according to another embodiment of the present invention to quasi resonant control shown in Fig. 9
The schematic diagram of the lowest point control module；
Figure 12 shows the specific implementation circuit of the lowest point control module shown in Fig. 10；
Figure 13 shows the specific implementation circuit of the lowest point control module shown in Figure 11；
Figure 14 shows the schematic diagram of frequency comparator #1 shown in Figure 13；
Figure 15 shows the specific implementation circuit of quasi resonant control shown in Fig. 7；
Figure 16 shows the specific implementation circuit of quasi resonant control shown in Fig. 8；
Figure 17 shows another specific implementation circuits of quasi resonant control shown in Fig. 8；
Figure 18 shows the another specific implementation circuit of quasi resonant control shown in Fig. 8；
Figure 19 shows the specific implementation circuit of quasi resonant control shown in Fig. 9.
Specific implementation mode
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is just for the sake of by showing that the example of the present invention is better understood from the present invention to provide.The present invention never limits
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown
Art is unnecessary fuzzy to avoid causing the present invention.
From the above it is found that in traditional quasi-resonance inverse-excitation type switch power-supply system, when system input voltage and it is
When output power of uniting is constant, system operating frequency is basically unchanged, therefore there is a problem of Conducted EMI in low-frequency range surplus deficiency.
It is a kind of method of improvement system electromagnetic interference to be added in quasi-resonance inverse-excitation type switch power-supply system and tremble frequency at random.But it is right
There are the upper limit or the quasi-resonance inverse-excitation type switch power-supply system of lower limit in system operating frequency, when being operated in system operating frequency
When near the upper limit or lower limit, the shake of system operating frequency can cause power switch therein to be switched to conducting from off state
It beats repeatedly between certain several adjacent resonance the lowest point of its drain voltage at the time of state, therefore system operating frequency can produce
Life is significantly fluctuated very much.On the one hand the huge fluctuation of system operating frequency can cause output voltage or electric current to generate larger
On the other hand ripple can also generate more frequency component in audio section, so that system has higher noise level.
In the quasi-resonance inverse-excitation type switch power-supply system that system operating frequency is restricted, in order to balance the EMI of system,
Noise and ripple index, it is necessary to provide a kind of new method come and meanwhile realize tremble frequency, the lowest point locks and to system operating frequency
Limitation.
The present invention provides a kind of novel quasi resonant control can be applied to system shown in FIG. 1, the quasi-resonance controls
Device processed needs to realize following functions：1) shake of system operating frequency is realized；2) when the peak for the armature winding for flowing through transformer T1
It is worth electric current IPKIt, will not be due at the time of power switch S1 is switched to conducting state from off state there are when the disturbance of high frequency variation
The disturbance and switch between the resonance the lowest point of its drain voltage；3) only become in system input voltage or system output power
When change causes system operating frequency to be more than upper limiting frequency or be less than lower frequency limit, just adjusts power switch S1 and cut from off state
The resonance the lowest point of drain voltage where at the time of changing to conducting state, to which system average operating frequency is adjusted to bound
Between frequency.
Fig. 7 shows the schematic diagram for the quasi resonant control according to the ... of the embodiment of the present invention that can apply system shown in FIG. 1.
Compared to quasi resonant control shown in Fig. 3, quasi resonant control according to the ... of the embodiment of the present invention controls mould including the lowest point simultaneously
Block and tremble frequency module.Here, it trembles frequency module and flows through transformation for characterizing by what is received in the CS terminals of quasi resonant control
The voltage of one variation of superposition is adjusted to realize on the primary winding current characterization signal of the electric current Ip of the armature winding of device T
Throttled transformer T armature winding peak point current IPKFunction, to realize adjustment to system operating frequency.It is superimposed
Voltage can be consecutive variations can also be change at random, and its change frequency is greater than system shown in FIG. 1
The bandwidth of feedback control loop.
Fig. 8 shows the original for the quasi resonant control according to another embodiment of the present invention that can apply system shown in FIG. 1
Reason figure.Similarly, compared to quasi resonant control shown in Fig. 3, quasi resonant control according to another embodiment of the present invention is same
When include the lowest point control module and trembling frequency module.Here, frequency module is trembled by receiving in the FB terminals of quasi resonant control
Stacking pseudorandom voltage comes on output voltage or current feedback signal for characterizing system output voltage or system output current
Realize the peak point current I for adjusting the armature winding for flowing through transformer TPKFunction, to realize adjusting to system operating frequency.
Fig. 9 shows the original for the quasi resonant control according to further embodiment of this invention that can apply system shown in FIG. 1
Reason figure.Similarly, same according to the quasi resonant control of further embodiment of this invention compared to quasi resonant control shown in Fig. 3
When include the lowest point control module and trembling frequency module.Here, resonance paddy of the frequency module by the drain voltage in power switch S1 is trembled
A small lead or a small retardation (that is, positive or negative delay) are nearby added to realize to system operating frequency in bottom
Adjusting.As long as controlling the size of added delay so that power switch S1 is still in the resonance the lowest point of its drain voltage
Nearby conducting state is switched to from off state, so that it may with the loss in efficiency of system shown in FIG. 1 control to sufficiently small journey
Degree.
Figure 10, which is shown, can be applied to Fig. 7 to the lowest point according to the ... of the embodiment of the present invention of quasi resonant control shown in Fig. 9
The schematic diagram of control module.As shown in Figure 10, signal processing unit to system operating frequency fs by carrying out frequency/voltage conversion
The first voltage signal of reflection system operating frequency fs is obtained, and passes through the first voltage signal to reflecting system operating frequency fs
It is integrated or is filtered, the burr or high frequency components in filtering appts working frequency fs obtain second voltage signal；Voltage
Comparing unit by second voltage signal respectively with reflection the first reference frequency the first reference voltage and reflect the second reference frequency
The second reference voltage be compared, it is determined whether change the resonance the lowest point serial number of Current lock (for example, by being locked to second
Resonance the lowest point changes to locking third resonance the lowest point or first resonance the lowest point), and export and increase the lowest point signal (+1) and subtract
Few the lowest point signal (- 1)；The lowest point selecting unit is according to the resonance for increase the lowest point signal and reducing the lowest point signal and shield certain amount
The lowest point is switched to conducting state in the predetermined resonance the lowest point of its drain voltage to control power switch S1 from off state.
Figure 11 shows that can be applied to Fig. 7 according to another embodiment of the present invention to quasi resonant control shown in Fig. 9
The schematic diagram of the lowest point control module.As shown in figure 11, frequency comparing unit directly joins system operating frequency fs with first respectively
It examines frequency and the second reference frequency compares, generate first frequency comparator output signal and second frequency comparator output signal；
Signal processing unit is by analog circuit or digital circuit respectively to first frequency comparator output signal and second frequency ratio
It integrated, filtered or other processing compared with device output signal, filtered out first frequency comparator output signal and second frequency compares
Burr in device output signal or high frequency components obtain increasing the lowest point signal and reduce the lowest point signal；The lowest point selecting unit according to
Increase the lowest point signal and reduce the lowest point signal control power switch S1 the predetermined resonance the lowest point of its drain voltage from shutdown shape
State is switched to conducting state.
In the quasi resonant control shown in Figure 10 to Figure 11, when increase the lowest point signal (+1) is effective, the lowest point selection is single
Member can increase the number of shielded resonance the lowest point；When reduction the lowest point signal (- 1) is effective, the lowest point selecting unit can reduce institute
The number of the resonance the lowest point of shielding；When increase and decrease the lowest point signal it is all invalid when, the lowest point selecting unit can maintain currently to be shielded
The invariable number for the resonance the lowest point covered.
Figure 12 shows the specific implementation circuit of the lowest point control module shown in Fig. 10.In the circuit shown in Figure 12：It will
Drive signal (Gate) that system operating frequency fs can be characterized, conducting with shutdown for driving power switch S1 is into line frequency
Rate/voltage conversion, obtains the voltage signal Vf of reflection system operating frequency fs；Low-pass filtering is carried out to voltage signal Vf, is obtained
Reflect the voltage signal Vavg of the average frequency of system operating frequency fs；By voltage signal Vavg with corresponding two respectively with reference to frequency
Two the datums Vup and Vdw of rate fup and fdw are compared, obtain increase the lowest point signal (+1) and reduction the lowest point signal (-
1).Here, Vavg>Vup means that system operating frequency fs is more than reference frequency fup, and it is effective to increase the lowest point signal (+1) at this time；
Vavg>Vdw means that system operating frequency fs is less than reference frequency fdw, and it is effective to reduce the lowest point signal (- 1).The lowest point selecting unit
May include a bidirectional counter, an accumulator and several logic gates, wherein：Bidirectional counter, which receives, increases paddy
Bottom signal (+1) and reduction the lowest point signal (- 1) increase and decrease or keep n-bit registers Q [(n-1):0]；Accumulator is utilized from accurate humorous
Shake controller the failing edge of the demagnetization detection signal De-mag for transformer T that receives of dem terminals to current switch week
The number C [(n-1) of the interim resonance the lowest point shielded:0] it is counted.The operation principle of the lowest point selecting unit is：Every
In a switch periods, in power switch S1 after conducting state is switched to off state (that is, being dragged down by drive signal Gate),
Accumulator starts to count from the failing edge of zero couple of demagnetization detection signal de-mag, is recorded in and has been shielded in current switch period
Resonance the lowest point number；Work as C<When Q, shielding demagnetization detection signal de-mag；Work as C>When=Q, no longer shielding demagnetization detection signal de-
Mag, the Q [(n-1) in current switch period:0] power switch S1 is switched to by+1 resonance the lowest point from off state leads
Logical state (that is, drive signal Gate is drawn high)；Drive signal, which is drawn high, can reset accumulator C [(n-1):0] it is zero, until next
Secondary drive signal Gate restarts to count after dragging down.
Figure 13 shows the specific implementation circuit of the lowest point control module shown in Figure 11.In the circuit shown in Figure 13, two
System operating frequency fs and reference frequency fup, fdw are compared by a frequency comparator respectively；Signal processing unit is to frequency
The output result of comparator carries out operation and processing；Bidirectional counter is using the comparison result of frequency comparator output (that is, increasing
The lowest point signal and reduce the lowest point signal) control the increase and decrease of resonance the lowest point；Port Multiplier based on the output of bidirectional counter come
Realize the lowest point control function.
Figure 14 shows the schematic diagram of frequency comparator #1 shown in Figure 13.As shown in figure 14, the work of frequency comparator #1
It is as follows to make principle：By the cycle T sw (that is, the corresponding switch periods of the switching frequency of power switch S1) of drive signal Gate and ginseng
It examines the corresponding retardation T=1/fup of frequency fup to be compared, obtained result has just corresponded to the magnitude relationship of fsw and fup
(increasing the lowest point signal i.e., it is possible to be generated by comparing fsw and fup).Frequency comparator #1 is also by using pulse current source pair
The mode compared result of capacitor charging carries out integration operation and (increases in the signal of the lowest point i.e., it is possible to be filtered out by Integral Processing
Burr).The circuit diagram of frequency comparator #2 needs the delay delay cell by T=1/ compared to frequency comparator #1
Fup becomes T=1/fdw, while switch Q1 is exchanged position with Q2 to realize reverse phase.
Figure 15 shows the specific implementation circuit of quasi resonant control shown in Fig. 7.In circuit shown in figure 15, frequency is trembled
Module is by resistance R0 and trembles frequency current source Ics_jitterIt realizes.Here, it is added to for characterizing the armature winding for flowing through transformer T1
Electric current Ip primary winding current characterization signal on voltage Vcs_jitter=Ics_jitter× R0 cyclically-varyings,
Bandwidth of the change frequency higher than error amplification and isolation module.Tremble frequency electric current Ics_jitterSignal amplitude in a switch periods
Interior can be consecutive variations can also be change at random.Tremble frequency electric current Ics_jitterCan to flow through transformer T it is primary around
The peak point current I of groupPKIt realizes and adjusts, by adjusting IPKIt can be with control system working frequency fs cyclically-varyings.
Figure 16 shows the specific implementation circuit of quasi resonant control shown in Fig. 8.In the circuit shown in Figure 16, pass through
Output voltage received in the FB terminals of quasi resonant control, for characterizing system output voltage or system output current or
Current feedback signal is superimposed one before entering PWM comparators and trembles frequency voltage VFB_jitter, realize the primary to flowing through transformer T
The peak point current I of windingPKAdjusting, pass through adjust IPKIt can be with control system working frequency fs cyclically-varyings.
Figure 17 shows another specific implementation circuits of quasi resonant control shown in Fig. 8.In the circuit shown in Figure 17,
Resistance R3 is inserted between the resistor voltage divider network and PWM comparators of R1 and R2 compositions, cyclically-varying is superimposed on resistance R3
Tremble frequency electric current Ics_jitter, Vcs_jitter=Ics_jitter* R3 cyclically-varyings, change frequency is higher than system shown in FIG. 1
The peak point current I of the armature winding to flowing through transformer T can be realized in the bandwidth of feedback control loopPKAdjusting, pass through adjust IPKIt can
With control system working frequency fs cyclically-varyings.
Figure 18 shows the another specific implementation circuit of quasi resonant control shown in Fig. 8.In the circuit shown in Figure 18,
Tremble frequency voltage VFB_jitterResistance pressure-dividing network R1 and R2 is superimposed upon in the following, trembling frequency voltage VFB_jitterCyclically-varying, variation
The peak value electricity of the armature winding to flowing through transformer T can be realized higher than the bandwidth of the feedback control loop of system shown in FIG. 1 for frequency
Flow IPKAdjusting, pass through adjust IPKIt can be with control system working frequency fs cyclically-varyings..
Figure 19 shows the specific implementation circuit of quasi resonant control shown in Fig. 9.In the circuit shown in Figure 19, the lowest point
The signal that control module provides has been superimposed the delay of a variation after delay cell, and the size of the delay is by trembling frequency electric current
IjitterIt is determined with capacitance Cd.Tremble frequency electric current IjitterChange frequency be slightly above the bandwidth of system shown in FIG. 1.Frequency electricity is trembled in control
Flow IjitterFrequency and amplitude can control system working frequency fs shake size and amplitude, control tremble frequency electric current Ijitter
Waveform can control system working frequency fs shaking way.
The lowest point control module in Figure 15 to Figure 19 can directly use realization method shown in Figure 12 to Figure 13, can also
Using it is other it is modified, replace or reconfigure by the way of.
It is switchable that quasi-resonance inverse-excitation type switch power-supply system according to the ... of the embodiment of the present invention can solve traditional quasi-resonance
The EMI problems of power-supply system, at the same also avoid in the quasi-resonance inverse-excitation type switch power-supply system there are frequency limits because
The problem of system output ripple and noise become larger caused by frequency is trembled to introduce.
The present invention can realize in other specific forms, without departing from its spirit and essential characteristics.For example, particular implementation
Algorithm described in example can be changed, and system architecture is without departing from the essence spirit of the present invention.Therefore, currently
Embodiment be all counted as being exemplary rather than in all respects it is limited, the scope of the present invention by appended claims rather than
Foregoing description defines, also, falls into the meaning of claim and whole in the range of equivalent change to be included in
Among the scope of the present invention.
Claims (6)
1. a kind of quasi-resonance inverse-excitation type switch power-supply system, including transformer, power switch and including trembling frequency module and the lowest point
The quasi resonant control of control module, wherein：
It is described to tremble frequency module
By adjusting the peak point current for the armature winding for flowing through the transformer, to adjust the switching frequency of the power switch,
Or
Lead or retardation are added by the resonance the lowest point of the drain voltage in the power switch, to adjust the power
The switching frequency of switch；
The lowest point control module
The switch frequency for reflecting the power switch is converted to by the switching frequency progress frequency/voltage to the power switch
The first voltage signal of rate filters out burr or high frequency therein by the way that the first voltage signal is integrated or is filtered
Disturbance obtains second voltage signal, by the way that the second voltage signal is electric with the first reference of the first reference frequency of reflection respectively
Second reference voltage of the second reference frequency of pressure and reflection is compared generation and increases the lowest point signal and reduce the lowest point signal, and root
According to it is described increase the lowest point signal and it is described reduce the lowest point signal control the power switch its drain voltage predetermined resonance paddy
Bottom is switched to conducting state from off state, or
By the way that the switching frequency of the power switch is carried out with first reference frequency and second reference frequency respectively
Compare and generate first frequency comparator output signal and second frequency comparator output signal, by respectively to the first frequency
Comparator output signal and the second frequency comparator output signal are integrated or are filtered, and the first frequency is filtered out
Burr or high frequency components in comparator output signal and the second frequency comparator output signal obtain the increase the lowest point
Signal and reduction the lowest point signal, and the power is controlled according to the increase the lowest point signal and reduction the lowest point signal and is opened
It closes and is switched to conducting state from off state in the predetermined resonance the lowest point of its drain voltage.
2. quasi-resonance inverse-excitation type switch power-supply system as described in claim 1, wherein the frequency module of trembling passes through for table
The primary winding current that sign flows through the electric current of the armature winding of the transformer characterizes the voltage that variation is superimposed on signal
To adjust the peak point current for the armature winding for flowing through the transformer.
3. quasi-resonance inverse-excitation type switch power-supply system as described in claim 1, wherein the frequency module of trembling passes through for table
The output voltage or electric current of the system output voltage or system output current of levying the quasi-resonance inverse-excitation type switch power-supply system are anti-
Stacking pseudorandom voltage adjusts the peak point current for the armature winding for flowing through the transformer on feedback signal.
4. quasi-resonance inverse-excitation type switch power-supply system as described in claim 1, wherein the lowest point control module includes signal
Processing unit, voltage comparison unit and the lowest point selecting unit, wherein：
The signal processing unit by will be used to drive the power switch conducting with shutdown drive signal into line frequency/
Voltage is converted to the first voltage signal for the switching frequency for reflecting the power switch, and by the first voltage
Signal carries out low-pass filtering treatment and obtains the second voltage signal for the average frequency of switching for reflecting the power switch；
The voltage comparison unit with first reference voltage and described second by joining the second voltage signal respectively
It examines voltage to be compared, generates the increase the lowest point signal and reduction the lowest point signal；
The lowest point selecting unit controls the power switch according to the increase the lowest point signal and reduction the lowest point signal and exists
The predetermined resonance the lowest point of its drain voltage is switched to conducting state from off state.
5. quasi-resonance inverse-excitation type switch power-supply system as claimed in claim 4, wherein the lowest point selecting unit
When increase the lowest point signal is effective, controls the power switch and be switched to from off state in next switch periods
Postpone a resonance the lowest point than current switch period at the time of conducting state；
When reduction the lowest point signal is effective, controls the power switch and be switched to from off state in next switch periods
At the time of conducting state previous resonance the lowest point is carried than current switch period；
When the reduction the lowest point signal and invalid increase the lowest point signal, the power switch is controlled in next switch week
It is interim to be in identical resonance the lowest point with current switch period at the time of be switched to conducting state from off state.
6. quasi-resonance inverse-excitation type switch power-supply system as described in claim 1, wherein the lowest point control module includes frequency
Comparing unit, signal processing unit and the lowest point selecting unit, wherein：
The frequency comparing unit includes first frequency comparator and second frequency comparator, and the first frequency comparator passes through
By the corresponding switch periods of the switching frequency of the power switch the first reference cycle corresponding with first reference frequency into
Row relatively generates the first frequency comparator output signal, the second frequency comparator passes through opening the power switch
The corresponding switch periods of pass frequency the second reference cycle corresponding with second reference frequency is compared generation described second
Frequency comparator output signal；
The signal processing unit passes through respectively to the first frequency comparator output signal and the second frequency comparator
Output signal is integrated or is filtered in analog domain or numeric field, filter out the first frequency comparator output signal and
Burr or high frequency components in the second frequency comparator output signal obtain the increase the lowest point signal and the reduction paddy
Bottom signal；
The lowest point selecting unit controls the power switch according to the increase the lowest point signal and reduction the lowest point signal and exists
The predetermined resonance the lowest point of its drain voltage is switched to conducting state from off state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810306947.3A CN108347173B (en) | 2018-04-08 | 2018-04-08 | Quasi-resonance flyback switching power supply system |
| TW107116336A TWI689162B (en) | 2018-04-08 | 2018-05-14 | Quasi-resonant flyback converter power supply system |
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| CN201810306947.3A CN108347173B (en) | 2018-04-08 | 2018-04-08 | Quasi-resonance flyback switching power supply system |
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| CN108347173B CN108347173B (en) | 2019-12-27 |
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| TW (1) | TWI689162B (en) |
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| CN109067213A (en) * | 2018-08-08 | 2018-12-21 | 苏州博创集成电路设计有限公司 | The switch power controller and control method of quasi-resonant mode |
| CN109302074A (en) * | 2018-11-02 | 2019-02-01 | 杰华特微电子（杭州）有限公司 | A kind of detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108347173B (en) | 2019-12-27 |
| TWI689162B (en) | 2020-03-21 |
| TW201944712A (en) | 2019-11-16 |
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