CN106712528A - Method and unit for modulating number of drive pulses of LLC resonant converter - Google Patents
Method and unit for modulating number of drive pulses of LLC resonant converter Download PDFInfo
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- CN106712528A CN106712528A CN201710016034.3A CN201710016034A CN106712528A CN 106712528 A CN106712528 A CN 106712528A CN 201710016034 A CN201710016034 A CN 201710016034A CN 106712528 A CN106712528 A CN 106712528A
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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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3381—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 in a self-oscillating arrangement using a single commutation path
-
- 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
- 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
- H02M3/33561—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 having more than one ouput with independent control
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to the field of direct current-direct current convertors, in particular to a method and a unit for modulating number of drive pulses of an LLC resonant converter. A voltage loop controller of an LLC realizes regulation on output voltage by regulating drive pulse frequency; when drive pulse frequency converted by an output value of the voltage loop controller is higher than maximum operating frequency of the LLC resonant converter, the method for modulating the number of the drive pulses is adopted, i.e., regulation on the output voltage is performed by regulating number of turn-on drive pulses and turn-off drive pulses. The method effectively realizes wide-voltage-range output of the LLC resonant converter, effectively reduces voltage ripples during idle load or light load, avoids voltage oscillation caused by simply turning on and turning off the drive pulses in the existing technical scheme, has a better current stabilizing effect when the LLC outputs relatively low voltage and outputs in constant current, and effectively reduces voltage overshoot during idle-load starting.
Description
Technical field
The present invention relates to LLC resonant converter field, and in particular to a kind of LLC resonant converter driving pulse number modulation
Method and unit.
Background technology
LLC resonant converter has the advantage that Sofe Switch is capable of achieving in the range of adjustable frequency, and LLC converters have higher
Conversion efficiency, but LLC simultaneously there are problems that it is following：
1st, gain of the output voltage of LLC to switching frequency is relevant with load, when unloaded or underloading under gain curve
Drop is slow.When driving pulse consecutive hours, it is impossible to realize the voltage transformation of relative broad range.
2nd, overshoot is exported when No Load Start can be very big, can cause output bus capacitor overvoltage.
LLC Voltage loops pi controller output can ratio conversion turn into switching frequency, by adjust switch frequency
Rate realizes the regulation of output voltage, when unloaded or underloading is only improved switching frequency to reduce voltage gain.But due to
Switching tube characterisitic parameter and resonance part characteristic are limited, and switching frequency can not be improved unrestrictedly.
Existing technical scheme is the output frequency when voltage ring controller higher than normal working frequency, shut-off driving arteries and veins
Punching, driving pulse is then opened less than normal working frequency.The long period is opened in the pulse that can so there is the closing long period again
Pulse, it is impossible to realize the uniform output of pulse, so as to cause output voltage unstable, the big problem of output ripple.
The content of the invention
In order to solve above mentioned problem of the prior art, the present invention proposes a kind of LLC resonant converter driving pulse
Number modulator approach and unit, realize wide-voltage range output, while unloaded output has preferable voltage regulation result with less line
Ripple, solves the problems, such as that No Load Start surge voltage is excessive.
A kind of LLC resonant converter driving pulse number modulator approach proposed by the present invention, the voltage ring controller of LLC is adopted
Frequency modulation control method is used, by the regulation for adjusting the frequency of driving pulse to realize to output voltage；When voltage ring controller is defeated
When to go out driving pulse frequency that value converses be higher than predeterminated frequency, using driving pulse number modulator approach, driven by adjusting
Pulsing one enters the regulation of line output voltage with the number of shut-off.
Preferably, the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts
The driving pulse number to be closed in cycle, and the driving pulse of correspondence number is closed within the current PRF counting cycle, carry out
The regulation of output voltage.
Preferably, the driving pulse number to be closed in the calculating current PRF counting cycle, specially：
Wherein, NoffIt is the driving pulse number to be closed in the current PRF counting cycle；foutFor current PRF counts week
The switching-frequency value that the output of voltage ring controller is converted into phase；fjIt is the highest frequency of resonator work；NpIt is current PRF
Individual counting number periodic quantity；kxIt is gain adjusting factor.
Preferably, kxValue is adjusted according to output current, specially：
When output current is more than 60% rated current, kx=8；Output current is more than 40% and less than or equal to 60% specified electricity
During stream, kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current more than 10% and
During less than or equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
Preferably, described predeterminated frequency is the maximum operation frequency of LLC resonance circuits.
A kind of LLC resonant converter driving pulse number modulating unit proposed by the present invention, the unit is used to control LLC humorous
Shake the driving pulse frequency of converter, including frequency modulation control module；The frequency modulation control module, by adjusting driving pulse frequency
Enter the regulation of line output voltage；Also include pulse number modulation module, the pulse number modulation module is configured to work as Voltage loop
When the driving pulse frequency that controller output valve is conversed is higher than predeterminated frequency, carried out by driving pulse number modulator approach defeated
Go out the regulation of voltage.
Preferably, the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts
The driving pulse number to be closed in cycle, and within the current PRF counting cycle close correspondence number driving pulse carry out it is defeated
Go out the regulation of voltage.
Preferably, the driving pulse number to be closed in the calculating current PRF counting cycle, specially：
Wherein, NoffIt is the pulse number to be closed in the current PRF counting cycle；foutFor in the current PRF counting cycle
The switching-frequency value that the output of voltage ring controller is converted into；fjIt is the highest frequency of resonator work；NpIt is current PRF number
Count periodic quantity；kxIt is gain adjusting factor.
Preferably, kxValue is adjusted according to output current, specially：
Preferably, described predeterminated frequency is the maximum operation frequency of LLC resonance circuits.
When output current is more than 60% rated current, kx=8；Output current is more than 40% and less than or equal to 60% specified electricity
During stream, kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current more than 10% and
During less than or equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
In the present invention, when the switching frequency of voltage ring controller output is higher than the design work frequency of LLC, using pulse
Number modulator approach replaces frequency modulation control method, effectively realizes the controlled resonant converter wide-voltage range output based on LLC, and
And voltage ripple when effectively reducing unloaded or underloading；Avoid in prior art using simply opening, turn off driving
The oscillation that pulse brings；There is more preferable steady flow result when LLC exports low voltage and constant current output；Effectively reduce sky
Carry voltage overshoot when starting.
Brief description of the drawings
Fig. 1 is the LLC half-bridge converter schematic diagrames of the present embodiment；
Fig. 2 is the voltage gain curve map of LLC half-bridge converters in Fig. 1；
Fig. 3 is the pulse number modulator approach schematic diagram used in the present embodiment.
Specific embodiment
The preferred embodiment of the present invention described with reference to the accompanying drawings.It will be apparent to a skilled person that this
A little implementation methods are used only for explaining know-why of the invention, it is not intended that limit the scope of the invention.
The present invention is to be calculated and controlled PWM module inside MCU microcontrollers.
A kind of LLC resonant converter driving pulse number modulator approach proposed by the present invention, the voltage ring controller of LLC is adopted
Use frequency modulation control method, the i.e. regulation by adjusting the frequency of driving pulse to realize to output voltage；When voltage ring controller
When the driving pulse frequency that output valve is conversed is higher than predeterminated frequency, using driving pulse number modulator approach, i.e., by regulation
Driving pulse opens the regulation for entering line output voltage with the number of shut-off.
If the LLC half-bridge converters in the present embodiment are not as shown in figure 1, take output voltage control measure, its voltage increases
Beneficial curve is as shown in Figure 2.In Fig. 1, VinIt is input voltage, VOIt is output voltage, Q1、Q2It is switch mosfet pipe, LrIt is inductance, C
It is electric capacity, LmIt is the magnetizing inductance of transformer primary side, ROIt is load resistance.
In the present embodiment, described predeterminated frequency is the maximum operation frequency of LLC resonance circuits.
In the present embodiment, the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts
The driving pulse number to be closed in cycle, and the driving pulse of correspondence number is closed within the current PRF counting cycle, carry out
The regulation of output voltage.
In the present embodiment, the driving pulse number to be closed in the calculating current PRF counting cycle, such as formula (1) institute
Show, specially：
Wherein, NoffIt is the driving pulse number to be closed in the current PRF counting cycle；foutFor current PRF counts week
The switching-frequency value that the output of voltage ring controller is converted into phase；fjIt is the highest frequency of resonator work；NpIt is current PRF
Individual counting number periodic quantity；kxIt is gain adjusting factor.As shown in figure 3, current PRF counts periodic quantity Np=8, what is calculated is current
The driving pulse number N to be closed in the step-by-step counting cycleoff=5.
In the present embodiment, kxValue is adjusted according to output current, specially：
When output current is more than 60% rated current, kx=8；Output current is more than 40% and less than or equal to 60% specified electricity
During stream, kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current more than 10% and
During less than or equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
A kind of LLC resonant converter driving pulse number modulating unit proposed by the present invention, the unit is used to control LLC humorous
Shake the driving pulse frequency of converter, including frequency modulation control module；The frequency modulation control module, by adjusting driving pulse frequency
Enter the regulation of line output voltage；Also include pulse number modulation module, the pulse number modulation module is configured to work as Voltage loop
When the driving pulse frequency that controller output valve is conversed is higher than predeterminated frequency, carried out by driving pulse number modulator approach defeated
Go out the regulation of voltage.
In the present embodiment, described predeterminated frequency is the maximum operation frequency of LLC resonance circuits.
In the present embodiment, the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts
The driving pulse number to be closed in cycle, and within the current PRF counting cycle close correspondence number driving pulse carry out it is defeated
Go out the regulation of voltage.
In the present embodiment, the driving pulse number to be closed in the calculating current PRF counting cycle, such as formula (1) institute
Show.
In the present embodiment, kxValue is adjusted according to output current, specially：
When output current is more than 60% rated current, kx=8；Output current is more than 40% and less than or equal to 60% specified electricity
During stream, kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current more than 10% and
During less than or equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
Those skilled in the art should be able to recognize that, the side of each example described with reference to the embodiments described herein
Method step, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate electronic hardware and
The interchangeability of software, generally describes the composition and step of each example according to function in the above description.These
Function is performed with electronic hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.
Those skilled in the art can realize described function to each specific application using distinct methods, but this reality
Now it is not considered that beyond the scope of this invention.
So far, combined preferred embodiment shown in the drawings describes technical scheme, but, this area
Technical staff is it is easily understood that protection scope of the present invention is expressly not limited to these specific embodiments.Without departing from this
On the premise of the principle of invention, those skilled in the art can make equivalent change or replacement to correlation technique feature, these
Technical scheme after changing or replacing it is fallen within protection scope of the present invention.
Claims (10)
1. a kind of LLC resonant converter driving pulse number modulator approach, the voltage ring controller of LLC uses frequency modulation control side
Method, by the regulation for adjusting the frequency of driving pulse to realize to output voltage；Characterized in that, when the output of voltage ring controller
When the driving pulse frequency that value is conversed is higher than predeterminated frequency, using driving pulse number modulator approach, arteries and veins is driven by adjusting
Wash the regulation that the logical number with shut-off enters line output voltage open.
2. method according to claim 1, it is characterised in that the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts the cycle
The interior driving pulse number to be closed, and the driving pulse of correspondence number is closed within the current PRF counting cycle, exported
The regulation of voltage.
3. method according to claim 2, it is characterised in that the drive to be closed in the calculating current PRF counting cycle
Moving pulse number, specially：
Wherein, NoffIt is the driving pulse number to be closed in the current PRF counting cycle；foutFor in the current PRF counting cycle
The switching-frequency value that the output of voltage ring controller is converted into；fjIt is the highest frequency of resonator work；NpIt is current PRF number
Count periodic quantity；kxIt is gain adjusting factor.
4. method according to claim 3, it is characterised in that kxValue is adjusted according to output current, specially：
When output current is more than 60% rated current, kx=8；Output current more than 40% and during less than or equal to 60% rated current,
kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current is more than 10% and is less than
During equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
5. the method according to any one of Claims 1 to 4, it is characterised in that described predeterminated frequency is LLC resonance circuits
Maximum operation frequency.
6. a kind of LLC resonant converter driving pulse number modulating unit, the unit is used to control the driving of LLC resonant converter
Pulse frequency, including frequency modulation control module；The frequency modulation control module, line output voltage is entered by adjusting driving pulse frequency
Regulation；Characterized in that, also including pulse number modulation module；The pulse number modulation module, is configured to when Voltage loop control
When the driving pulse frequency that device output valve processed is conversed is higher than predeterminated frequency, exported by driving pulse number modulator approach
The regulation of voltage.
7. unit according to claim 6, it is characterised in that the driving pulse number modulator approach is：
It is that predeterminated frequency is constant to keep driving pulse frequency, and the output according to voltage ring controller calculates current PRF and counts the cycle
The interior driving pulse number to be closed, and the driving pulse of closing correspondence number carries out output electricity within the current PRF counting cycle
The regulation of pressure.
8. unit according to claim 7, it is characterised in that the drive to be closed in the calculating current PRF counting cycle
Moving pulse number, specially：
Wherein, NoffIt is the pulse number to be closed in the current PRF counting cycle；foutIt is voltage in the current PRF counting cycle
The switching-frequency value that the output of ring controller is converted into；fjIt is the highest frequency of resonator work；NpIt is current PRF counting number
Periodic quantity；kxIt is gain adjusting factor.
9. unit according to claim 8, it is characterised in that kxValue is adjusted according to output current, specially：
When output current is more than 60% rated current, kx=8；Output current more than 40% and during less than or equal to 60% rated current,
kx=16；Output current more than 20% and during less than or equal to 40% rated current, kx=32；Output current is more than 10% and is less than
During equal to 20% rated current, kx=64；When output current is less than or equal to 10%, kx=128.
10. the unit according to any one of claim 6~9, it is characterised in that described predeterminated frequency is LLC resonance
The maximum operation frequency of circuit.
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| CN201710016034.3A CN106712528B (en) | 2017-01-10 | 2017-01-10 | LLC resonant converter driving pulse number modulator approach and unit |
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| CN201710016034.3A CN106712528B (en) | 2017-01-10 | 2017-01-10 | LLC resonant converter driving pulse number modulator approach and unit |
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| CN107276190A (en) * | 2017-05-27 | 2017-10-20 | 华为技术有限公司 | The Wave method and device, equipment of a kind of underloading ripple |
| CN110707921A (en) * | 2019-11-29 | 2020-01-17 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN110868060A (en) * | 2019-11-29 | 2020-03-06 | 广东美的制冷设备有限公司 | Control method, control device, household appliance and computer readable storage medium |
| CN110880862A (en) * | 2019-11-29 | 2020-03-13 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN110880863A (en) * | 2019-11-29 | 2020-03-13 | 广东美的制冷设备有限公司 | Control method, control device, household appliance and computer readable storage medium |
| CN112019025A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Operation control method, device, circuit, household appliance and computer storage medium |
| CN112886808A (en) * | 2019-11-29 | 2021-06-01 | 广东美的制冷设备有限公司 | Control method, control device, household appliance and computer readable storage medium |
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| CN107276190A (en) * | 2017-05-27 | 2017-10-20 | 华为技术有限公司 | The Wave method and device, equipment of a kind of underloading ripple |
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| CN112019025B (en) * | 2019-05-31 | 2022-05-27 | 广东美的制冷设备有限公司 | Operation control method, device, circuit, household appliance and computer storage medium |
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| CN110880862A (en) * | 2019-11-29 | 2020-03-13 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
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| CN112886808A (en) * | 2019-11-29 | 2021-06-01 | 广东美的制冷设备有限公司 | Control method, control device, household appliance and computer readable storage medium |
| CN110880862B (en) * | 2019-11-29 | 2021-12-21 | 广东美的制冷设备有限公司 | Control method, control device, household electrical appliance and computer readable storage medium |
| CN112886808B (en) * | 2019-11-29 | 2022-06-10 | 广东美的制冷设备有限公司 | Control method, control device, household appliance and computer readable storage medium |
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| Publication number | Publication date |
|---|---|
| CN106712528B (en) | 2018-11-20 |
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