CN106612073A - LLC intermittent model control method - Google Patents
LLC intermittent model control method Download PDFInfo
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- CN106612073A CN106612073A CN201510710305.6A CN201510710305A CN106612073A CN 106612073 A CN106612073 A CN 106612073A CN 201510710305 A CN201510710305 A CN 201510710305A CN 106612073 A CN106612073 A CN 106612073A
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- llc
- rectification module
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- intermittent
- loop control
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to an LLC intermittent model control method, and the method comprises the following steps: S1, judging whether a rectification module is in an LLC intermittent model or not: switching to step S2 if the rectification module is in the LLC intermittent model, or else switching to step S3; S2, detecting whether the rectification module works in a mode of current loop control or a mode of voltage loop control, and respectively detecting whether a voltage loop control wave transmission condition or a current loop control wave transmission condition is met or not: starting the wave transmission if the voltage loop control wave transmission condition or the current loop control wave transmission condition is met, or else ending the wave transmission; S3, judging whether a voltage loop control wave transmission stopping condition or a current loop control wave transmission stopping condition is met or not: stopping the wave transmission if the voltage loop control wave transmission stopping condition or the current loop control wave transmission stopping condition is met, or else ending the wave transmission. According to the invention, current criteria are added to a control process of the LLC intermittent model, and the method can achieve a current-limiting state during a light load. Moreover, the method can carry out the further filtering of a sampled output voltage, effectively reduces the overshoot of an output voltage during intermittent wave transmission, and improves the characteristics of output voltage ripples. Compared with a mode employing a dead load, the method solves a problem that an LLC light load is not monotonous through the intermittent model, and improves the efficiency.
Description
Technical field
The present invention relates to field of circuit technology, more particularly, it relates to a kind of control of LLC intermittent modes
Method.
Background technology
According to LLC resonance circuits operation principle and its gain characteristic, the one side when unloaded or underloading is exported
It is increased sharply can switching frequency, and then increases switching loss impact efficiency；On the other hand underloading also occurs
Not dull problem, this not dull phenomenon can affect the tune of loop for simple frequency modulation control mode
Section control.
At present, for above-mentioned phenomenon, mainly there are following three kinds of solutions：
First, using plus dead load by the way of；But this method avoids switching frequency by sacrificing efficiency
It is too high.
Second, carry out adjusting wide frequency modulation control.The method is had good based on LLC in the wide frequency modulation state of tune
Monotonic nature, but its control process is complicated.
3rd, using intermittent mode.The intermittent mode is come limit switch frequency using a kind of " hiccup " mode
Less than certain upper limit preset value, but the method can bring the of short duration overshoot of output voltage, especially for low pressure
The power supply of output, it is larger to voltage ripple Index Influence.
However, for industrial power, such as with the industrial power of 198～286V of High voltage output, knot
Its characteristic is closed, voltage ripple peak-to-peak value requires to be 1%, relatively low pressure output such as the communication power supply of 48V, work
The reality of industry power supply can allow ripple peak-to-peak value to can reach 1.98V, complete by controlling simple intermittent mode
Ripple requirement can be met.In addition compared to the wide frequency modulation control mode of tune, intermittent mode does not need complementary drive
PWM adjusts wide state, for the DSP control chips positioned at secondary adopt transformator in the selection of drive circuit
Isolation drive, so as to save the cost of optocoupler.
Fig. 1 is referred to, is that a kind of LLC topological circuits interval sends out wave mode control flow chart.The controlling stream
Journey be applied to DCDC part using LLC topology rectification module, can interval send out ripple by way of for
The not dull problem of underloading of LLC topologys is evaded.As shown in figure 1, the program may include step A0 extremely
A6：
First, in step A0, the control of the LLC intermittent modes is performed once at preset time intervals
Flow process；
Subsequently, in step A1, judge that rectification module whether in LLC intermittent modes, for example, judges
Whether intermittent mode flag bit is 0, is to be not at LLC intermittent modes, goes to step A3, is otherwise in
LLC intermittent modes, go to step A2；
Subsequently, in step A2, detect whether that meeting Voltage loop control sends out ripple condition, such as output voltage
It is to meet condition to go to step an A5 unlatching ripples less than or equal to given voltage 0.2V, otherwise goes to step A6
Terminate；
In step A5, open and send PWM ripples, and loop calculating output frequency is set to into 150kHz；
It is simultaneously 0 by intermittent mode mark position；
In step A3, judge whether that meeting Voltage loop control stops sending out ripple condition, for example whether loop meter
Calculate output frequency and be more than or equal to given frequency such as 150k, and output voltage more than given voltage such as 0.2V,
It is to meet condition to go to step an A4 stopping ripples, otherwise goes to step A6 and terminate；
In step A4, stop sending PWM ripples, while being 1 by intermittent mode mark position；
In step A6, flow process terminates.When starting timer, after terminating at preset time intervals again
Perform the control flow of the LLC intermittent modes.
As described above, the method calculates output frequency as criterion using the output voltage of rectification module and loop,
It is more than or equal to given frequency such as 150k, and output voltage more than given electricity when loop calculates output frequency
Pressure and difference be more than the first predeterminated voltage such as 0.2V when, rectification module stop send out a ripple；When rectification module
When output voltage is less than or equal to the first predeterminated voltage such as 0.2V less than given voltage, and difference, rectification module
Open and send out ripple.
Module output voltage stabilization can given point voltage, and stricture of vagina by the program in underloading from the point of view of theoretically
Ripple within such as +/- 0.2V, but finds that the program is present in the first predetermined voltage range during practical application
Larger defect, causes rectification module output to remain problem, and for example in underloading, rectification module cannot current limliting.This
It is because that the criterion for entering intermittent mode only has voltage, therefore module cannot be introduced into current limliting state in underloading.
The content of the invention
The technical problem to be solved in the present invention is only to adopt for the control method of existing LLC intermittent modes
Cause rectification module that the defect of current limliting state is cannot be introduced in underloading as criterion with voltage, there is provided it is a kind of simultaneously with
Control method of the voltage and current as the LLC intermittent modes of criterion.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of LLC intermittent modes
Control method, comprises the following steps：
S1, judge that rectification module, whether in LLC intermittent modes, is to go to step S2, otherwise go to step
S3；
S2, detection rectification module work in current loop control or Voltage loop control；Working in Voltage loop
During control, detect whether that meeting Voltage loop control sends out ripple condition, be then to open to send out ripple, otherwise terminate；In work
When making in current loop control, judge whether that meeting current loop control sends out ripple condition, be then to open to send out ripple, otherwise
Terminate；
S3, judge whether to meet that Voltage loop control stops sending out ripple condition or current loop control stops sending out a ripple bar
Part, is then to stop sending out ripple, is otherwise terminated.
In the control method according to LLC intermittent modes of the present invention, step S1 is specifically included：
Judge that rectification module, whether in LLC intermittent modes, is to go to step S2 according to intermittent mode flag bit,
Otherwise go to step S3.
In the control method according to LLC intermittent modes of the present invention, step S2 is specifically included：
S21, judge whether rectification module works in Voltage loop control, be to go to step S22, otherwise turn step
Rapid S24；
S22, the output voltage of rectification module is judged whether less than given voltage, and difference is less than or equal to first
Predeterminated voltage, while rectification module is in energy state is passed, it is to go to step S23, otherwise terminate；
S23, unlatching send out a ripple, and loop calculating output frequency is set to into the first given frequency；Simultaneously by institute
State rectification module and switch to non-LLC intermittent modes；
S24, the output current of rectification module is judged whether less than given electric current, and difference is less than or equal to second
Predetermined current, while rectification module is in energy state is passed, it is to go to step S25, otherwise terminate；
S25, unlatching send out a ripple, and loop calculating output frequency is set to into the first given frequency；Simultaneously by institute
State rectification module and switch to non-LLC intermittent modes.
In the control method according to LLC intermittent modes of the present invention, step S3 is specifically included：
S31, judge that whether loop calculates output frequency more than or equal to the second given frequency, and whether meet：
A) when rectification module works in Voltage loop control, output voltage is more than given voltage and difference is pre- more than first
If voltage, or b) when rectification module works in current loop control output current more than given electric current and difference
More than the second predetermined current；It is to go to step S32, otherwise terminates；
S32, stopping send out a ripple, and the rectification module are switched to into LLC intermittent modes.
In the control method according to LLC intermittent modes of the present invention, methods described is additionally included in step
The step of performing before rapid S1：S1 ', the output voltage to the rectification circuit of sampling carry out high-pass filtering, should
The cut-off frequency of high-pass filtering is less than first given frequency and second given frequency.
In the control method according to LLC intermittent modes of the present invention, the cut-off of the high-pass filtering
Frequency is 10kHz-20kHz.
In the control method according to LLC intermittent modes of the present invention, first given frequency can
With equal with the second given frequency.Second given frequency can also be preset less than the first given frequency one
Value.The preset value is 10-30kHz.It is highly preferred that the preset value is 20kHz.
Implement the control method of the LLC intermittent modes of the present invention, have the advantages that：The present invention exists
Electric current criterion is added in the control process of LLC intermittent modes, is distinguished and whether is operated in Voltage loop or electricity
Under stream ring control, to be capable of achieving current limliting state in underloading；The present invention can also further to the output electricity of sampling
Pressure is filtered, and efficiently reduces the overshoot of output voltage when interval sends out ripple, improves output voltage ripple
Characteristic；Compared with by the way of the dead load, the present invention only solves LLC by frequency modulation intermittent mode
The not dull problem of underloading, improves efficiency.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is that a kind of LLC topological circuits interval sends out wave mode control flow chart；
The control method flow chart of LLC intermittent modes of the Fig. 2 to be provided according to first embodiment of the invention；
The control method flow chart of LLC intermittent modes of the Fig. 3 to be provided according to second embodiment of the invention；
The control method having electronic of LLC intermittent modes of the Fig. 4 to be provided according to second embodiment of the invention is born
Carry an oscillogram of underloading current limliting state；
The control method having electronic of LLC intermittent modes of the Fig. 5 to be provided according to second embodiment of the invention is born
Carry another oscillogram of underloading current limliting state；
The control method strip resistance of LLC intermittent modes of the Fig. 6 to be provided according to second embodiment of the invention is born
Carry another oscillogram of underloading current limliting state；
Fig. 7 is the control method of LLC intermittent modes that provided according to second embodiment of the invention in interval mould
Output voltage ripple figure under formula zero load；
The control method flow chart of LLC intermittent modes of the Fig. 8 to be provided according to third embodiment of the invention；
The control method of LLC intermittent modes of the Fig. 9 to be provided according to third embodiment of the invention measures filtering
The sampled signal figure of front output voltage；
The control method of LLC intermittent modes of the Figure 10 to be provided according to third embodiment of the invention measures filtering
The sampled signal figure of output voltage afterwards；
Figure 11 is the control method of LLC intermittent modes that provided according to third embodiment of the invention in interval mould
Output voltage ripple figure under formula zero load；
Figure 12 is the control method of LLC intermittent modes that provided according to third embodiment of the invention in interval mould
Output voltage ripple figure under formula heavy duty；
The control method flow chart of LLC intermittent modes of the Figure 13 to be provided according to fourth embodiment of the invention；
Figure 14 is the control method of LLC intermittent modes that provided according to fourth embodiment of the invention in interval mould
Output voltage ripple figure under formula.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing and reality
Example is applied, the present invention will be described in further detail.
Fig. 2 is referred to, the control method of the LLC intermittent modes to provide according to first embodiment of the invention
Flow chart.As shown in Fig. 2 the method is comprised the following steps：
First, start in step so), perform once the LLC intermittent modes afterwards at preset time intervals
Control flow.By taking the rectification module of model ER22010TN of Ai Mosheng companies production as an example, its is main
Including the passive PFC units of three-phase and DC/DC units the two power cells, other can also have auxiliary
Power supply, input and output detector unit and other protection circuits.Wherein DC/DC units are by dsp controller
The PWM ripples control of transmission, and not dull for the underloading of LLC topologys by the way of ripple asking is sent out using interval
Topic, the control flow can be performed once every 14.28us.
Subsequently, in step sl, judge that rectification module, whether in LLC intermittent modes, is to go to step
S2, otherwise goes to step S3.
In step s 2, detect that rectification module works in current loop control or Voltage loop control；
When Voltage loop control is worked in, detect whether that meeting Voltage loop control sends out a ripple condition, be then to open to send out
Ripple, otherwise goes to step S4 and terminates；
When current loop control is worked in, judge whether that meeting current loop control sends out ripple condition, be then to open to send out
Ripple, otherwise goes to step S4 and terminates；
In step s3, judge whether that meeting Voltage loop control stopping ripple condition or current loop control stops
Ripple condition is only sent out, is then to stop sending out ripple, otherwise gone to step S4 and terminate.
Finally, the flow process ends at step S4, to wait and go to step S0 after predetermined time interval.
Fig. 3 is referred to, the control method of the LLC intermittent modes to provide according to second embodiment of the invention
Flow chart.As shown in figure 3, the second embodiment is similar to first embodiment, comprise the following steps：
First, start in step so), perform once the LLC intermittent modes afterwards at preset time intervals
Control flow, for example, perform one-time detection every 14.28us.
Subsequently, in step sl, judge rectification module whether between LLC according to intermittent mode flag bit
Have a rest pattern, be to go to step S2, otherwise go to step S3.Specifically, if intermittent mode flag bit is 1
Represent and be in LLC intermittent modes, be that 0 interval scale is in non-LLC intermittent modes.Therefore such as institute in Fig. 3
Show that this step may determine that whether intermittent mode flag bit is 0, be to go to step S3, otherwise go to step S2.
Subsequently, step S2 includes step S21-S25：
In the step s 21, judge whether rectification module works in Voltage loop control, be, go to step S22,
Otherwise go to step S24.The step can also be then to judge whether rectification module works in current loop control
S24 is gone to step, S22 is otherwise gone to step.
In step S22, whether the output voltage of rectification module is judged less than given voltage, and difference is little
In equal to the first predeterminated voltage, at the same rectification module in pass can state, be to go to step S23, otherwise tie
Beam.Can judge rectification module whether can shape in biography by judging rectification module shutdown mark in the present invention
The shutdown of state, such as rectification module is designated 0 interval scale rectification module and shuts down in energy state, rectification module is passed
It is designated 1 interval scale rectification module to be not at passing the i.e. non-biography energy state of energy state.The biography energy state is different from letter
Single power on and off state, and refer to whether the DSP control module under power-up state in rectification module passes
Energy.When rectification module is under biography energy state, rectification module is powered and be input into upper electric, while rectification module
Middle DSP control module passes energy；And under non-biography energy state, although rectification module is powered, due to inspection
Some exceptions are measured without exporting energy, i.e., without output voltage and output current, this state is typically considered to
It is off-mode, but now auxiliary source is in work, it is meant that and in work, this is one to DSP control module
Plant the off-mode of active.Additionally, the first predeterminated voltage can require to be preset according to voltage ripple.Example
Such as require that setting the first predeterminated voltage is about 0.2V according to voltage ripple.I.e. when the output voltage of rectification module is little
In given voltage, and difference is less than or equal to 0.2V, and rectification module is rectification module in energy state is passed
When shutdown is designated 0, judge that it meets Voltage loop control and sends out ripple condition, go to step S23.
In step S23, open and send for controlling DC/DC unit PWM ripples, and loop is calculated
Output frequency is set to the first given frequency；Simultaneously rectification module is switched to into non-LLC intermittent modes, example
It is 0 such as by intermittent mode mark position, and goes to step S4 and terminate.Loop calculates output frequency and refers to and passes through
The rectification module switching frequency that loop is calculated, i.e. output control frequency.First given frequency is the rectification
Switching frequency during module intermittent mode.By taking the rectification module of aforementioned model ER22010TN as an example, should
First given frequency is about 150kHz.Therefore, the loop of voltage loop can be calculated output frequency in the step
Rate is set to 150kHz.
In step s 24, whether the output current of rectification module is judged less than given electric current, and difference is little
In equal to the second predetermined current, while rectification module shutdown is designated 0, it is to go to step S25, otherwise tie
Beam.Second predetermined current can require to be preset according to current limliting.For example set the second predetermined current to be about
0.1A.I.e. when the output current of rectification module is less than given electric current, and difference is less than or equal to 0.1V, and
Rectification module in pass can state be rectification module shutdown be designated 0 when, judge its meet current loop control send out
Ripple condition, goes to step S25.
In step s 25, open and send for controlling DC/DC unit PWM ripples, and loop is calculated
Output frequency is set to the first given frequency；Simultaneously rectification module is switched to into non-LLC intermittent modes will
Intermittent mode mark position is 0, and goes to step S4 and terminate.For example, can be by current loop in the step
Loop calculates output frequency and is set to 150kHz.
Subsequently, step S3 includes step S31-S32：
In step S31, judge that whether loop calculates output frequency more than or equal to the second given frequency, and
And whether meet：A) work in output voltage when Voltage loop is controlled in rectification module and be more than given voltage and difference
More than the first predeterminated voltage, or b) when rectification module works in current loop control output current more than given
Electric current and difference are more than the second predetermined current；It is to go to step S32, otherwise terminates.In this embodiment,
Second given frequency is equal with the first given frequency, as the rectification module intermittent mode when switching frequency.
That is, it is more than or equal to 150kHz when loop calculates output frequency, while output voltage is more than given electricity
Press and difference then meets Voltage loop control and stops sending out a ripple condition more than 0.2V, or frequency is exported when loop is calculated
Rate is more than or equal to 150kHz, while output current is more than given electric current and difference then judges to meet more than 0.1A
Electric current loop stops sending out ripple condition.It should be appreciated that, the object judged in this step remains loop and calculates defeated
Go out frequency, this is because the switching frequency that loop is calculated can just become actual defeated only within the scope of one
Go out frequency, and output frequency will be limited in threshold value after going beyond the scope, therefore when to loop output calculating frequency
Carry out also being equivalent to carry out amplitude limit to actual output frequency after amplitude limit.
In step s 32, controller is made to stop sending the PWM ripples for controlling DC/DC units, and
Rectification module is switched to into LLC intermittent modes, will intermittent mode mark position be 1.
Finally, the flow process ends at step S4, to wait and go to step S0 after predetermined time interval.
As shown in Figure 4 and Figure 5, the LLC intermittent modes that provide according to a second embodiment of the present invention are provided
Control method having electronic loads underloading current limliting state oscillogram.Waveform W1 is the output of rectification module wherein in figure
Electric current, waveform W2 is the output voltage of rectification module, and waveform W3 is used for the drive waveforms of rectification module
In the PWM ripples of control DC/DC units.As illustrated, using first embodiment and second embodiment
Control program after, intermittent mode can also be entered when module is operated in electric current loop, it is achieved thereby that underloading limit
Stream.Additionally need and be mentioned that, the present invention has found that output current occurs drop once in a while in test process
As shown in white rectangle inframe in Fig. 4, output current drop output voltage rises, the appearance milli of unusual waveforms
It is irregular.Additionally, it is observed that another place's exception, as shown in figure 5, driving output current when sending out ripple to have switch frequency
The ripple of rate and to descending, drive in theory send out ripple former limit always to secondary pass can, under electric current should not occur
Fall.Based on above-mentioned 2 points exception, present invention discover that it is relevant with automatically adjusting for electronic load, then exist
Above-mentioned abnormal disappearance after ohmic load test is changed, as shown in Figure 6.
By experiment test, the rectification module precision of steady current of the present invention meets specification, rectification mould
Block is input into 456VAC, exports CV198V, and current-limiting points arrange 0.2, and circuit tester reading is 1.8343A (moulds
Block is not calibrated)；Module is input into 456VAC, exports CV234V, and current-limiting points arrange 0.2, circuit tester reading
For 1.8281A, precision of steady current is 1.8243-1.8281/1.8243=0.208%, meets wanting for specifications 0.5%
Ask.
Although the scheme of above-mentioned second embodiment can obtain higher precision of steady current, by entering one
Step experiment finds that the output voltage ripple of rectification module can not meet the ripple factor index of specifications 0.5% and want
Ask.By taking the rectification module of aforementioned model ER22010TN as an example, intermittent mode output voltage ripple peak-
Peak value can not meet 600mV limit values.In theory under intermittent mode, output voltage ripple should be limited in
Within +/- 0.2V, actual measurement intermittent mode output voltage ripple is as shown in fig. 7, forward direction has larger ripple
Close 1V, and the ripple of negative sense is in 0.2V or so；Additionally, it was found that intermittent mode sends out ripple and uneven,
Send out once in a while and send out once in a while more than ripple that ripple is few, this size once in a while is simultaneously irregular.2 points based on more than, the present invention sends out
The voltage sample of existing rectification module is interfered, and is that this also just may be used because switching noise is larger when module sends out ripple
Inaccurate (correspondence forward direction ripple) is judged during explaining and send out ripple, and judges that ground is more accurately (right when not sending out ripple
Answer negative sense ripple).Additionally, because of voltage sample wider range, 0.2V corresponds to the digital quantity of sample port and is
0.2*12.8263 is approximately equal to 3, and so little digital quantity is easy to the impact being interfered.Analyze based on more than,
The present invention is filtered in the scheme being more highly preferred to the voltage that intermittent mode is used for criterion.
Fig. 8 is referred to, the control method of the LLC intermittent modes to provide according to third embodiment of the invention
Flow chart.As shown in figure 3, the 3rd embodiment is similar to second embodiment, differs only in and be additionally included in
The step of performing before step S1：
S1 ', the output voltage to the rectification circuit of sampling carry out high-pass filtering, the cutoff frequency of the high-pass filtering
Rate is less than the first given frequency and the second given frequency.Because switching frequency during intermittent mode gives equal to first
Frequency, about 150kHz, in theory, more less than this frequency, sampled signal is by this frequency for the cut-off frequency
The interference of rate is less, it is contemplated that the response speed that intermittent mode judges, cut-off frequency again can not be too low.
Therefore, in a preferred embodiment of the invention, the cut-off frequency of the high-pass filtering is 10kHz-20kHz.
By taking the rectification module of aforementioned model ER22010TN as an example, the cut-off frequency of preliminary setting high-pass filtering is
10kHz.Measure front and filtered output voltage the sampled signal of filtering as shown in Figure 9 and Figure 10.From
The reading value of sampling is visible, reading is adopted before filtering and has spike once in a while or drop, oval circle in such as Fig. 9
The position for going out, and filtered reading then relative smooth of sampling, it is seen that the filtering of addition 10kHz can be effective
Suppress the interference of sampling.Should be explanatorily that herein intermittent mode is used for adopting for the output voltage of voltage criterion
It is decoupling that sample and loop calculate the output voltage sampling of output frequency.
Although the scheme of above-mentioned 3rd embodiment can effectively suppress the interference sampled, experiment to find
The output voltage ripple of rectification module still has once in a while larger overshoot, as shown in figure 11.Further survey
Examination finds intermittent mode compared with the output ripple under heavy duty as shown in figure 12, sends out in ripple cluster in longer, defeated
Go out voltage occur in that drop after just close send out a ripple, it is seen that the output voltage ratio that herein voltage criterion is sampled to
Determining the high 0.2V of voltage should meet already.Therefore the reason for problem occur is caused not to be that voltage sample is forbidden,
It is that no satisfaction does not just cause to send out a driving supervention ripple frequency criterion, if will show as when underloading herein
One very high spike of output voltage.Again then analysis intermittent mode stop send out ripple criterion：1st, sample
Output voltage more than given voltage 0.2V, 2, loop calculates output frequency and be more than or equal to 150kHz.In the past
The test of phase sees the rectification module of ER22010TN in input 456VAC, when 120 Europe of output band load
100kHz or so just occur it is not dull, then in more preferred embodiment, the frequency of intermittent mode
Criterion can so can guarantee that not dull work shape to the movement of low frequency direction, then to retain certain allowance
State can enter interval, while the working condition of dullness will not enter intermittent mode.Should be explanatorily, because
Intermittent mode cannot assess its stability with classical control theory, and ripple index, control accuracy are relatively all
It is less better, therefore only the operating point of stable output can be realized with frequency modulation with the problem that its solution is never dull as far as possible
Then as far as possible using the method for frequency modulation.
Figure 13 is referred to, the control method of the LLC intermittent modes to provide according to fourth embodiment of the invention
Flow chart.As shown in figure 13, the fourth embodiment is similar to 3rd embodiment, differs only in：Step
The second given frequency is less than the preset value of the first given frequency one in S31 medium frequency criterions.Preferably, this is preset
It is worth for 10-30kHz.By taking the rectification module of aforementioned model ER22010TN as an example, when the first given frequency
For 150kHz when, second given frequency can be 130kHz, i.e., to low frequency direction move 20kHz.It is real
Verify that intermittent mode is not in overshoot larger once in a while after bright change, the output voltage of its actual measurement intermittent mode
Ripple is as shown in figure 14.Output voltage ripple disclosure satisfy that peak-to-peak value 1V during test intermittent mode.
In sum, the present invention calculates two conditions of output frequency as between entrance using output voltage and loop
Whether the criterion of pattern of having a rest, further discriminate between out and be operated under Voltage loop or current loop control, so as to light
Current limliting state is capable of achieving during load.The present invention can also be filtered to the output voltage sampled, between efficiently reducing
The overshoot of output voltage during Xie Fabo, improves the characteristic of output voltage ripple.With by the way of dead load
Compare, the present invention only solves the not dull problem of LLC underloadings by frequency modulation intermittent mode, improves efficiency.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that is not taking off
From the scope of the invention when, various change and equivalent can be carried out.Additionally, the spy to adapt to the technology of the present invention
Determine occasion or material, many modifications can be carried out to the present invention without deviating from its protection domain.Therefore, the present invention
Specific embodiment disclosed herein is not limited to, and including all enforcements for dropping into claims
Example.
Claims (10)
1. a kind of control method of LLC intermittent modes, it is characterised in that comprise the following steps：
S1, judge that rectification module, whether in LLC intermittent modes, is to go to step S2, otherwise go to step
S3；
S2, detection rectification module work in current loop control or Voltage loop control；
When Voltage loop control is worked in, detect whether that meeting Voltage loop control sends out a ripple condition, be then to open to send out
Ripple, otherwise terminates；
When current loop control is worked in, judge whether that meeting current loop control sends out ripple condition, be then to open to send out
Ripple, otherwise terminates；
S3, judge whether to meet that Voltage loop control stops sending out ripple condition or current loop control stops sending out a ripple bar
Part, is then to stop sending out ripple, is otherwise terminated.
2. the control method of LLC intermittent modes according to claim 1, it is characterised in that described
Step S1 is specifically included：
Judge that rectification module, whether in LLC intermittent modes, is to go to step according to intermittent mode flag bit
S2, otherwise goes to step S3.
3. the control method of LLC intermittent modes according to claim 1, it is characterised in that described
Step S2 is specifically included：
S21, judge whether rectification module works in Voltage loop control, be to go to step S22, otherwise turn step
Rapid S24；
S22, the output voltage of rectification module is judged whether less than given voltage, and difference is less than or equal to first
Predeterminated voltage, while rectification module is in energy state is passed, it is to go to step S23, otherwise terminate；
S23, unlatching send out a ripple, and loop calculating output frequency is set to into the first given frequency；Simultaneously by institute
State rectification module and switch to non-LLC intermittent modes；
S24, the output current of rectification module is judged whether less than given electric current, and difference is less than or equal to second
Predetermined current, while rectification module is in energy state is passed, it is to go to step S25, otherwise terminate；
S25, unlatching send out a ripple, and loop calculating output frequency is set to into the first given frequency；Simultaneously by institute
State rectification module and switch to non-LLC intermittent modes.
4. the control method of LLC intermittent modes according to claim 3, it is characterised in that described
Step S3 is specifically included：
S31, judge that loop calculates output frequency and whether more than or equal to the second given frequency and whether meets：
A) when rectification module works in Voltage loop control, output voltage is more than given voltage and difference is pre- more than first
If voltage, or b) when rectification module works in current loop control output current more than given electric current and difference
More than the second predetermined current；It is to go to step S32, otherwise terminates；
S32, stopping send out a ripple, and the rectification module are switched to into LLC intermittent modes.
5. the control method of LLC intermittent modes according to claim 4, it is characterised in that described
Method is additionally included in the step of performing before step S1：
S1 ', the output voltage to the rectification circuit of sampling carry out high-pass filtering, the cutoff frequency of the high-pass filtering
Rate is less than first given frequency and second given frequency.
6. the control method of LLC intermittent modes according to claim 5, it is characterised in that described
The cut-off frequency of high-pass filtering is 10kHz-20kHz.
7. the control method of LLC intermittent modes according to claim 4, it is characterised in that described
First given frequency is equal with the second given frequency.
8. the control method of LLC intermittent modes according to claim 5, it is characterised in that described
Second given frequency is less than the preset value of the first given frequency one.
9. the control method of LLC intermittent modes according to claim 8, it is characterised in that described
Preset value is 10-30kHz.
10. the control method of LLC intermittent modes according to claim 9, it is characterised in that institute
Preset value is stated for 20kHz.
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| CN108923628A (en) * | 2018-08-22 | 2018-11-30 | 深圳市矗能科技有限公司 | A method of reducing LLC intermittent mode output ripple |
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| CN109802569A (en) * | 2018-09-17 | 2019-05-24 | 合肥博鳌电气科技有限公司 | A kind of LLC resonant converter light load control method |
| CN110149044A (en) * | 2019-06-24 | 2019-08-20 | 阳光电源股份有限公司 | Two-stage converter and its starting method, LLC converter and application system |
| CN112134454A (en) * | 2020-09-18 | 2020-12-25 | 浙江吉利控股集团有限公司 | Frequency-pushing soft start control method and system of CLLC topological circuit and vehicle |
| CN113489343A (en) * | 2021-08-23 | 2021-10-08 | 阳光电源股份有限公司 | Photovoltaic inverter, photovoltaic system and grid connection method |
| CN113765406A (en) * | 2021-09-29 | 2021-12-07 | 阳光电源股份有限公司 | Hiccup control method and device for LLC resonant circuit |
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| CN108923628A (en) * | 2018-08-22 | 2018-11-30 | 深圳市矗能科技有限公司 | A method of reducing LLC intermittent mode output ripple |
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| CN112134454B (en) * | 2020-09-18 | 2022-03-15 | 浙江吉利控股集团有限公司 | Frequency-pushing soft start control method and system of CLLC topological circuit and vehicle |
| CN113489343A (en) * | 2021-08-23 | 2021-10-08 | 阳光电源股份有限公司 | Photovoltaic inverter, photovoltaic system and grid connection method |
| CN113489343B (en) * | 2021-08-23 | 2022-11-15 | 阳光电源股份有限公司 | Photovoltaic inverter, photovoltaic system and grid connection method |
| CN113765406A (en) * | 2021-09-29 | 2021-12-07 | 阳光电源股份有限公司 | Hiccup control method and device for LLC resonant circuit |
| CN113765406B (en) * | 2021-09-29 | 2024-02-09 | 阳光电源股份有限公司 | Hiccup control method and device of LLC resonant circuit |
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