CN109560706A - PSR current control system under LLC framework - Google Patents
PSR current control system under LLC framework Download PDFInfo
- Publication number
- CN109560706A CN109560706A CN201710892388.4A CN201710892388A CN109560706A CN 109560706 A CN109560706 A CN 109560706A CN 201710892388 A CN201710892388 A CN 201710892388A CN 109560706 A CN109560706 A CN 109560706A
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- zero
- electric current
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02M3/33569—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 several active switching elements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses the PSR current control systems under a kind of LLC framework, including polarity of voltage conversion circuit, current signal sample circuit, electric current, which is handed over, gets over circuit for detecting, zero current circuit for detecting, and current integration circuit, polarity of voltage conversion circuit obtains voltage signal by LLC transformer primary side and exports positive voltage signal, then current integration circuit obtains the electric current input signal of current signal sample circuit output respectively, electric current hands over the zero current point for getting over circuit for detecting output, with the zero current condition of zero current circuit for detecting output, according to zero current point and zero current condition, the minimum current level of electric current input signal is promoted to zero current, it generates a current integration waveform and generates an output electric current after integrating, the direct primary side of LLC transformer is enabled to obtain the output electric current of the state to control secondary side output.
Description
Technical field
The invention relates to the PSR current control systems under a kind of LLC framework, particularly relate to a kind of in primary side acquirement
Transformer current signal extrapolates output electric current, the PSR current control system under LLC framework to reach stability contorting.
Background technique
Consumer electrical product and LED drive circuit market are constantly grown up in recent years, so that power adapter must be saved more
Electricity and miniaturization.LLC framework has largely been used in efficient voltage conversion system, such as PC, the power supply unit of server,
Illumination or Netcom's power supply etc..Common LLC control adjusts feedback with conventional secondary side, one group of photo-coupler through primary side and
Comparator (Error Amp lifier) reaches constant voltage and constant current control.In secondary-side circuitry main application be will time
To primary side, feedback circuit can adjust the responsibility cycle of pulse signal by this signal, be worked as with reaching the signal transduction of grade side
When output loading changes, which stills provide stable electric current and voltage and uses to output loading, and with load
Variation, negatively correlated change can be presented in the operating frequency of LLC, transformer current operation may be made in three different modes,
Namely: when operating frequency is lower than resonance frequency, transformer current operation mode can enter non-continuous mode (DCM)；Work as behaviour
When working frequency is equal to resonance frequency, transformer current operation mode can enter critical conduction mode；And when operating frequency is higher than resonance
When frequency, transformer current operation mode can enter continuous mode (CCM).Existing control method must increase part in primary side
Number, PCB space and cost, and the circuit for detecting of primary side can generate power loss, influence stand-by power consumption.Therefore, many industry
Person is just towards PSR (Pr imary-Si de Regu l at i on, primary side adjustment) Lai Fazhan.
The feedback control circuit that PSR does not need primary side can pass through primary side control output loading situation and determine electricity to reach
Stream is controlled with constant voltage.This control method is through the voltage signal in detecting primary side transformer auxiliary winding, to control arteries and veins
The responsibility cycle of wave signal stablizes output loading situation.
The framework of the most frequently used PSR control is F lyback (flyback control), but F l yback must be operated at critical module
Formula or non-continuous mode, once continuous mode of entering (COM), the PSR control of F l yback will be out of control.But LLC framework is
Change the gain of output using frequency is changed.Therefore which kind of mode the operation that LLC can not be limited is in.
In view of disadvantages mentioned above has been commonly used, inventor is the road for aforesaid drawbacks Improvement, there is production of the present invention finally
It is raw.
Summary of the invention
Present invention is primarily aimed at provide one kind in primary side and obtain transformer current signal, calculate output electric current, reach
PSR current control system under the LLC framework of stability contorting.
To reach above-mentioned purpose and effect, technological means practiced by the present invention includes:
One polarity of voltage conversion circuit is electrically connected with the LLC transformer primary side of a default, will be in a voltage signal
Negative voltage switchs to positive voltage and exports a positive voltage signal；
One current signal sample circuit is electrically connected with aforesaid voltage polarity switching, is received positive voltage signal and is taken
Obtain an electric current input signal；
One electric current, which is handed over, gets over circuit for detecting, is electrically connected with aforesaid voltage polarity switching, receives positive voltage signal simultaneously
Calculate a zero current point；
One zero current circuit for detecting is electrically connected with aforementioned LLC transformer primary side, detects a zero current condition；And
One current integration circuit hands over more circuit for detecting and zero current to detect with aforementioned currents signal sample circuit, electric current respectively
Slowdown monitoring circuit is electrically connected, and receives electric current input signal, zero current point and zero current condition, according to zero current point and zero electricity
Stream mode promotes the minimum current level of electric current input signal to zero current, after generating a current integration waveform and integrating
Generate an output electric current；
Whereby, polarity of voltage conversion circuit obtains voltage signal output output positive voltage by aforementioned LLC transformer primary side
Signal, then current integration circuit obtains the electric current input signal of current signal sample circuit output respectively, electric current friendship is more detected
The zero current point of circuit output, the zero current condition with the output of zero current circuit for detecting, according to zero current point and zero current
State promotes the minimum current level of electric current input signal to zero current, generates a current integration waveform and produces after integrating
Raw output electric current enables the direct primary side of LLC transformer obtain the output electric current of the state to control secondary side output.
According to above structure, the zero current circuit for detecting is electrically connected to the preset zero potential section of aforementioned LLC transformer
Point.
According to above structure, the current integration circuit is electrically connected to a LED drive circuit of default.
More specifically understand to can get above-mentioned purpose of the invention, effect and feature, as follows according to each Detailed description of the invention:
Detailed description of the invention
Fig. 1 is the circuit structure block diagram of present pre-ferred embodiments.
Fig. 2 is partial circuit structural block diagram in Fig. 1.
Fig. 3 is the movement oscillogram of the present invention in a continuous mode.
Fig. 4 is the waveform decomposition diagram of Fig. 3.
Fig. 5 is movement oscillogram of the present invention under non-continuous mode.
Fig. 6 is the movement oscillogram of the present invention in a critical mode.
Specific embodiment
It please refers to shown in Fig. 1, Fig. 2, it is known that structure of the invention specifically includes that
One polarity of voltage conversion circuit 2 is electrically connected with 1 primary side of LLC transformer of a default, will be in a voltage signal
Negative voltage switch to positive voltage and export a positive voltage signal；
One current signal sample circuit 3 is electrically connected with aforesaid voltage polarity switching 2, receives positive voltage signal
Obtain an electric current input signal；
One electric current, which is handed over, gets over circuit for detecting 4, is electrically connected with aforesaid voltage polarity switching 2, receives positive voltage signal
And calculate a zero current point；
One zero current circuit for detecting 5 is electrically connected with aforementioned 1 primary side of LLC transformer, detects a zero current condition, i.e.,
It is electrically connected to the preset zero potential node ZCD of aforementioned LLC transformer；And
One current integration circuit 6 is handed over aforementioned currents signal sample circuit 3, electric current get over circuit for detecting 4 and zero current respectively
Circuit for detecting 5 is electrically connected, and receives electric current input signal, zero current point and zero current condition, according to zero current point with
The minimum current level of electric current input signal is promoted to zero current point, generates a current integration waveform simultaneously by zero current condition
An output electric current is generated after integral, output electric current is transferred to a LED drive circuit 7 of default；
Whereby, polarity of voltage conversion circuit 2 obtains voltage signal by aforementioned 1 primary side of LLC transformer and exports positive voltage
Signal, then current integration circuit 6 obtains the electric current input signal of the output of current signal sample circuit 3 respectively, electric current friendship is more detectd
The zero current condition that the zero current point and zero current circuit for detecting 5 that slowdown monitoring circuit 4 exports export, according to zero current point and zero
Current status promotes the minimum current level of electric current input signal to zero current, generates a current integration waveform and integrates
An output electric current is generated afterwards, enables output electricity of the LLC transformer 1 directly by primary side acquirement to control secondary side output state
Stream controls LED drive circuit 7.
Please refer to shown in Fig. 3 to Fig. 6, the control waveform of signal A is controlled, according to the period of positive-negative half-cycle, is divided into
Positive period, S1 and negative cycle S2, sampling current ISH corresponded to control signal A, actual current waveform i r is exactly display oscillography for another example
The current waveform figure that device is shown；Excitation current iM is generated when being from the movement of LLC transformer 1, and to calculate acquirement output
Electric current IOUT；Stablize excitation current iM, be when LLC transformer 1 control signal A conversion when, temporarily terminate in one stablize it is defeated
It does well down；And ID1, ID2, it is that last operation obtains as a result, when the present invention starts movement:
Time point t0-t1: sampling current ISH is negative voltage, and therefore, polarity of voltage conversion circuit 2 goes back to negative voltage just
Voltage；
Time point t1-t2: the sampling current I SH for switching to positive voltage is obtained；
Time point t2-t4: the zero current detecting point ZCD of zero current circuit for detecting 5 detects that zero current exports, then samples electricity
Stream I SH is fixed on current value when zero current occurs；
Time point t3-t4: electric current, which is handed over, gets over the periodic conversion that circuit for detecting 4 senses control signal A, switchs to height by low potential
Current potential, at this point, output electric current I OUT is positive electricity pressure condition；
Time point t4-t5: meanwhile, electric current is exported by S1 positive period and enters negative cycle S2, and polarity of voltage conversion circuit 2 will be born
The sampling current of voltage switchs to positive voltage；
Time point t6-t0: at this point, current integration circuit 6 will generate one after the current integration integral of pulse shape of time point t0-t6
Output current IO UT, i.e. current integration circuit 6 carry out the resonance current ID2 of the resonance current ID1 of positive half cycle S1, negative half period S2
Integral enables the direct primary side of LLC transformer 1 obtain the output electric current of the state to control secondary side output；One complete
The end cycle of signal A is controlled, subsequent action then repeats aforesaid time point t0-t6.
Above-mentioned movement, when to Fig. 5, Fig. 6 is shone, the micromotion people of waveform be it is identical, difference is to operate
Mode.
In summary, actually a tool is novel and progressive for the PSR current control system under LLC framework of the invention
Invention proposes the application of patent of invention in accordance with the law；Only above explained content, only presently preferred embodiments of the present invention explanation, such as
Variation, modification, change or the equivalent replacement person that technological means under this invention and scope are extended, should all fall into power of the invention
In sharp range.
Claims (3)
1. the PSR current control system under a kind of LLC framework, it is characterised in that: include:
One polarity of voltage conversion circuit is electrically connected, by the negative electricity in a voltage signal with the LLC transformer primary side of a default
Pressure switchs to positive voltage and exports a positive voltage signal；
One current signal sample circuit is electrically connected with aforesaid voltage polarity switching, is received positive voltage signal and is obtained one
Electric current input signal；
One electric current, which is handed over, gets over circuit for detecting, is electrically connected with aforesaid voltage polarity switching, receives positive voltage signal and calculates
A zero current point out；
One zero current circuit for detecting is electrically connected with aforementioned LLC transformer primary side, detects a zero current condition；And
One current integration circuit is handed over aforementioned currents signal sample circuit, electric current get over circuit for detecting and zero current detecting electricity respectively
Road is electrically connected, and receives electric current input signal, zero current point and zero current condition, according to zero current point and zero current shape
State promotes the minimum current level of electric current input signal to zero current, generates a current integration waveform and generates after integrating
One output electric current enables the direct primary side of LLC transformer obtain the output electric current of the state to control secondary side output.
2. the PSR current control system under LLC framework according to claim 1, it is characterised in that: the zero current detecting
Circuit is electrically connected to the preset zero potential node of LLC transformer.
3. the PSR current control system under LLC framework according to claim 1, it is characterised in that: the current integration electricity
Road is electrically connected to a LED drive circuit of default.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892388.4A CN109560706B (en) | 2017-09-27 | 2017-09-27 | PSR current control system under LLC framework |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710892388.4A CN109560706B (en) | 2017-09-27 | 2017-09-27 | PSR current control system under LLC framework |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109560706A true CN109560706A (en) | 2019-04-02 |
| CN109560706B CN109560706B (en) | 2020-08-25 |
Family
ID=65863896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710892388.4A Expired - Fee Related CN109560706B (en) | 2017-09-27 | 2017-09-27 | PSR current control system under LLC framework |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109560706B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1834840A (en) * | 2006-03-10 | 2006-09-20 | 崇贸科技股份有限公司 | Controller of once controlled power source supplier for controlling output current |
| EP2339736A1 (en) * | 2009-12-28 | 2011-06-29 | STMicroelectronics S.r.l. | Charge-mode control device for a resonant converter |
| CN102548158A (en) * | 2012-03-28 | 2012-07-04 | 无锡安特源科技有限公司 | Light load control structure of power supply using logic link control (LLC) topology |
| CN102810890A (en) * | 2011-06-01 | 2012-12-05 | Nxp股份有限公司 | Van lammeren johannes petrus maria [nl]; lammers matheus johannes gerardus |
| CN203457063U (en) * | 2013-09-13 | 2014-02-26 | 深圳市金威源科技股份有限公司 | High-frequency switching power supply output rectifier circuit |
| US20140375229A1 (en) * | 2013-06-19 | 2014-12-25 | Exscitron Gmbh | Switched-mode power supply device and use of such a switched mode power supply device |
| CN104734514A (en) * | 2013-12-18 | 2015-06-24 | 德州仪器德国股份有限公司 | Primary side current regulation on llc converters for led driving |
-
2017
- 2017-09-27 CN CN201710892388.4A patent/CN109560706B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1834840A (en) * | 2006-03-10 | 2006-09-20 | 崇贸科技股份有限公司 | Controller of once controlled power source supplier for controlling output current |
| EP2339736A1 (en) * | 2009-12-28 | 2011-06-29 | STMicroelectronics S.r.l. | Charge-mode control device for a resonant converter |
| CN102810890A (en) * | 2011-06-01 | 2012-12-05 | Nxp股份有限公司 | Van lammeren johannes petrus maria [nl]; lammers matheus johannes gerardus |
| CN102548158A (en) * | 2012-03-28 | 2012-07-04 | 无锡安特源科技有限公司 | Light load control structure of power supply using logic link control (LLC) topology |
| US20140375229A1 (en) * | 2013-06-19 | 2014-12-25 | Exscitron Gmbh | Switched-mode power supply device and use of such a switched mode power supply device |
| CN203457063U (en) * | 2013-09-13 | 2014-02-26 | 深圳市金威源科技股份有限公司 | High-frequency switching power supply output rectifier circuit |
| CN104734514A (en) * | 2013-12-18 | 2015-06-24 | 德州仪器德国股份有限公司 | Primary side current regulation on llc converters for led driving |
Non-Patent Citations (2)
| Title |
|---|
| JAE-BUM LEE,ET AL: "A Novel Accurate Primary Side Control (PSC) Method for Half-Bridge (HB) LLC Converter", 《THE 2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE》 * |
| 廖天澄,等: "一种原边控制恒流 LED 驱动电路设计", 《电子元件与材料》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109560706B (en) | 2020-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108093530B (en) | Control circuit, control method and linear LED drive circuit applying same | |
| CN103703867B (en) | For using transistor saturated control that voltage is fed to voltage supply equipment and the method for electrical load | |
| US20130250629A1 (en) | Constant voltage constant current control circuits and methods with improved load regulation | |
| US9072138B2 (en) | Color correcting device driver | |
| CN102685975B (en) | Controllers, systems and methods for controlling dimming of light sources | |
| US9954455B2 (en) | Constant on time COT control in isolated converter | |
| TWI510131B (en) | Light emitting device driver circuit and control method thereof | |
| US8295066B2 (en) | Extensible switching power circuit | |
| CN105099203B (en) | A kind of voltage sample control circuit, voltage sample control method and isolated converter | |
| US8704452B2 (en) | Illumination device with adjustable luminance and luminance adjustment method thereof | |
| CN101516151A (en) | LED drive circuit and LED illumination device using same | |
| TW201342993A (en) | Highly efficient LED driving circuit and driving method thereof | |
| JP2015520479A (en) | Apparatus and method for supplying energy to light emitting means | |
| CN109302068A (en) | Switch type power supply and related power controller for providing different output voltages | |
| US9548667B2 (en) | Constant on-time (COT) control in isolated converter | |
| US9425697B2 (en) | Power supply and method for compensating low-frequency output voltage ripple thereof | |
| CN105050235A (en) | Dimming edge detection for power converter | |
| CN105763032A (en) | Electronic device and control method thereof | |
| CN104378872B (en) | Light emitting diode system and voltage conversion device | |
| US9577542B2 (en) | Constant on-time (COT) control in isolated converter | |
| CN109039093A (en) | Isolation type switching power supply and its control method | |
| CN103560673A (en) | Power supply circuit and liquid crystal display television | |
| CN103259391A (en) | Load driving circuit, power converter and controller | |
| CN101777846B (en) | System and method for controlling switch power supply | |
| TW201524105A (en) | Power controllers and relevant control methods capable of providing load compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200825 Termination date: 20210927 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |