CN108667307A - LLC synchronous rectificating devices and its control method, electronic equipment, storage medium - Google Patents
LLC synchronous rectificating devices and its control method, electronic equipment, storage medium Download PDFInfo
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- CN108667307A CN108667307A CN201810588640.7A CN201810588640A CN108667307A CN 108667307 A CN108667307 A CN 108667307A CN 201810588640 A CN201810588640 A CN 201810588640A CN 108667307 A CN108667307 A CN 108667307A
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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
- H02M3/33569—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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—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 having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The present invention provides LLC synchronous rectificating devices,Including input terminal,Switching circuit,Resonant network resistance,Transformer,Current rectifying and wave filtering circuit,Output end,Driving device,Driving device includes drive module,Resonant frequency detection module,Exciting current surveys module,Rectification turns off module,Drive module is connect with switching circuit,Drive module output drive signal driving switch circuit turn-on,Resonant frequency detection module and exciting current detection module are connect with resonant network resistance respectively,Resonant frequency detection module obtains the resonance current of resonant network resistance,And resonance current is sent to rectification and turns off module,Exciting current detection module obtains the exciting current of resonant network resistance,And exciting current is sent to rectification and turns off module,Rectification turns off module and receives resonance current and exciting current,And the time of drive signal is corresponded to when monitoring resonance current and equal exciting current in real time.The present invention can effectively, fast and accurately determining secondary MOSFET turn-off times, control be simply, at low cost.
Description
Technical field
The present invention relates to protection field of circuit technology more particularly to LLC synchronous rectificating devices and its control method, electronics to set
Standby, storage medium.
Background technology
LLC resonant converter, due to that can realize the Sofe Switch of power device in full-load range, in DC/DC
Converter field is widely applied.However, when exporting low-voltage, high-current, due to LLC resonant converter secondary side diode
Forward conduction voltage drop increases so that rectifier loss occupies the sizable proportion of total losses, is unfavorable for the raising of efficiency.It is existing at present
Most of LLC synchronous rectificating devices be to use dedicated control chip, circuit parameter is arranged that difficulty is larger, and circuit parameter exists
The MOSFET of synchronous rectification may be caused to damage in debugging process, in addition to this control synchronous rectification also by pure software
The break-make of MOSFET, but it is less than resonant frequency (fs in switching frequency<Fr in the case of), it is difficult to determine secondary MOSFET shutdowns
Time, so it is also cumbersome to calculate the secondary MOSFET turn-off times by software.Therefore, there is an urgent need for one kind can simply accurately
Determine the LLC synchronous rectificating devices and its control method of secondary MOSFET turn-off times.
Invention content
The present invention is based at least one above-mentioned technical problem, it is proposed that LLC synchronous rectificating devices and its control method,
Electronic equipment, storage medium, can effectively, fast and accurately determine the secondary MOSFET turn-off times, control simply, cost
It is low.
In order to achieve the above objectives, the present invention provides LLC synchronous rectificating devices, including input terminal, switching circuit, resonant network
Circuit, transformer, current rectifying and wave filtering circuit, output end further include driving device, and the driving device includes drive module, resonance
Frequency detection module, exciting current survey module, rectification turns off module, and the drive module is connect with the switching circuit, described
Drive module output drive signal drives the switching circuit conducting, the resonant frequency detection module and exciting current inspection
It surveys module to connect with the resonant network resistance respectively, the resonant frequency detection module obtains the humorous of the resonant network resistance
Shake electric current, and the resonance current is sent to the rectification and turns off module, and the exciting current detection module obtains described humorous
Shake the exciting current of lattice network, and the exciting current is sent to the rectification and turns off module, and the rectification turns off module
It is corresponded to when receiving the resonance current and the exciting current, and monitoring the resonance current and the equal exciting current in real time
The time of the drive signal.
Further, the current rectifying and wave filtering circuit includes connecting the rectification circuit formed and output by four metal-oxide-semiconductor full-bridges
Capacitance, the output capacitance are connected in parallel between two metal-oxide-semiconductors opposite in the rectification circuit.
Further, further include Current Transmit, the Current Transmit is connected on the secondary sideline of the transformer
Between circle and the rectification circuit.
Further, the switching circuit includes the first main switch metal-oxide-semiconductor and the second main switch metal-oxide-semiconductor, the driving mould
Block is connect with the grid of the grid of the first main switch metal-oxide-semiconductor and the second main switch metal-oxide-semiconductor respectively, the drive module output
Drive signal drives the first main switch metal-oxide-semiconductor and the conducting of the second main switch metal-oxide-semiconductor, the resonant network resistance and described the
Two main switch metal-oxide-semiconductors are in parallel.
Further, the resonant network resistance includes resonant capacitance, resonant inductance, magnetizing inductance, the resonant capacitance,
Resonant inductance, magnetizing inductance are sequentially connected in series, and the magnetizing inductance is connect with the primary coil both ends of the transformer.
LLC synchronous rectificating device control methods, include the following steps：
Driving switch pipe is connected, output drive signal to the switching circuit, by being opened described in drive signal driving
The switching tube on powered-down road is connected；
Detection electric current in real time detects the resonance current and exciting current of resonance circuit in real time；
The synchronous rectification turn-off time is determined, when monitoring the resonance current and the equal exciting current in real time described in correspondence
The time of drive signal determines the turn-off time of rectifying tube in current rectifying and wave filtering circuit according to the time.
Further, the step driving switch pipe conducting is specially to export the drive signal to the switching circuit
The grid of the grid of first main switch metal-oxide-semiconductor or the second main switch metal-oxide-semiconductor drives first master to open by the drive signal
Close metal-oxide-semiconductor or the conducting of the second main switch metal-oxide-semiconductor.
Further, the step detects electric current and specially detects in real time in the resonance circuit on resonant inductance in real time
Exciting current in resonance current and the resonance circuit on magnetizing inductance.
A kind of electronic equipment, including memory, processor and storage are on a memory and the meter that can run on a processor
The step of calculation machine program, the processor executes above-mentioned LLC synchronous rectificating devices control method.
A kind of computer readable storage medium, is stored thereon with computer program, and the computer program is held by processor
The step of above-mentioned LLC synchronous rectificating devices control method is realized when row.
Compared with prior art, advantage of the invention is that：Present invention offer LLC synchronous rectificating devices, including input terminal,
Switching circuit, resonant network resistance, transformer, current rectifying and wave filtering circuit, output end, further include driving device, and driving device includes
Drive module, resonant frequency detection module, exciting current survey module, rectification turns off module, and drive module is connect with switching circuit,
Drive module output drive signal driving switch circuit turn-on, resonant frequency detection module and exciting current detection module respectively with
Resonant network resistance connects, and resonant frequency detection module obtains the resonance current of resonant network resistance, and resonance current is sent
Module is turned off to rectification, exciting current detection module obtains the exciting current of resonant network resistance, and exciting current is sent to
Rectification turns off module, and rectification turns off module and receives resonance current and exciting current, and monitors resonance current and exciting current in real time
The time of drive signal is corresponded to when equal.The present invention can effectively, fast and accurately determine the secondary MOSFET turn-off times, control
System is simple, at low cost.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
The specific implementation mode of the present invention is shown in detail by following embodiment and its attached drawing.
Description of the drawings
It is described in further detail below in conjunction with the accompanying drawings with embodiments of the present invention.
Fig. 1 is the LLC synchronous rectificating device structural schematic diagrams of the present invention；
Fig. 2 is the LLC synchronous rectificating device circuit diagrams of the embodiment of the present invention；
Fig. 3 is the LLC synchronous rectificating device logical topology charts of the embodiment of the present invention；
Fig. 4 is the signal correspondence figure of the embodiment of the present invention；
Fig. 5 is the LLC synchronous rectificating device control method flow charts of the present invention.
Specific implementation mode
Understand to make the objectives, technical solutions, and advantages of the present invention more remove, it is with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
LLC synchronous rectificating devices, as Figure 1-Figure 2, including input terminal, switching circuit, resonant network resistance, transformation
Device, current rectifying and wave filtering circuit, output end, further include driving device, driving device include drive module, resonant frequency detection module,
Exciting current surveys module, rectification turns off module, and drive module is connect with switching circuit, and the driving of drive module output drive signal is opened
Circuit turn-on is closed, resonant frequency detection module and exciting current detection module are connect with resonant network resistance respectively, resonant frequency
Detection module obtains the resonance current of resonant network resistance, and resonance current is sent to rectification and turns off module, exciting current inspection
The exciting current that module obtains resonant network resistance is surveyed, and exciting current is sent to rectification and turns off module, rectification turns off module
The time of drive signal is corresponded to when receiving resonance current and exciting current, and monitoring resonance current and equal exciting current in real time.
As shown in Figure 2, it is preferred that current rectifying and wave filtering circuit include the rectification circuit being made of the connection of four metal-oxide-semiconductor full-bridges and
Output capacitance, output capacitance are connected in parallel between two metal-oxide-semiconductors opposite in rectification circuit.In Fig. 2, by metal-oxide-semiconductor S1, S2, S3, S4
The rectification circuit of full-bridge connection composition, output capacitance Cout.When exporting low-voltage, high-current, due to LLC resonant converter pair
Side diode forward conduction voltage drop increases so that rectifier loss occupies the sizable proportion of total losses, is unfavorable for carrying for efficiency
Height, in order to improve this situation and improve transducer effciency, the present embodiment substitutes two poles using the extremely low MOSFET of on state resistance
Pipe realizes synchronous rectification.
In one embodiment, it is preferred that further include Current Transmit, Current Transmit is connected on transformer in Fig. 2
Between the secondary coil and rectification circuit of T1.
In one embodiment, it is preferred that switching circuit includes the first main switch metal-oxide-semiconductor and the second main switch metal-oxide-semiconductor, Fig. 2
In the first main switch metal-oxide-semiconductor be Q1, the second main switch metal-oxide-semiconductor is Q2, drive module grid with the first main switch metal-oxide-semiconductor Q1 respectively
Pole is connected with the grid of the second main switch metal-oxide-semiconductor Q2, and drive module output drive signal PWM_Q1 drives the first main switch metal-oxide-semiconductor
Q1 is connected, PWM_Q2 driving the second main switch metal-oxide-semiconductor Q2 conductings of drive module output drive signal, resonant network resistance and second
Main switch metal-oxide-semiconductor is in parallel, and Cin is input capacitance.
In one embodiment, it is preferred that resonant network resistance includes resonant capacitance Cr, resonant inductance Lr, excitation electricity in Fig. 2
Feel Lm, resonant capacitance Cr, resonant inductance Lr, magnetizing inductance Lm are sequentially connected in series, the primary coil of magnetizing inductance Lm and transformer T1
Both ends connect.
In one embodiment, setting DIR_CT is the current direction of Current Transmit, it is specified that electric current from left to right flows to
For high level, on the contrary is low level, and PWM_S1 is the drive signal of metal-oxide-semiconductor S1.As shown in figure 3, A level points be PWM_Q1 with
DIR_CT phases with and negate；B level points are A points and the signal value after the coefficient rest-set flip-flops of PWM_Q1；C level points are B
With DIR_CT phases or；D level points are PWM_Q1 and the signal value after the coefficient rest-set flip-flops of C；E level points be PWM_Q1 with
DIR_CT phases with；PWM_S1 level be D and E phases and.Primary metal-oxide-semiconductor is the first main switch metal-oxide-semiconductor Q1 in switching circuit, second
Main switch metal-oxide-semiconductor Q2, secondary metal-oxide-semiconductor are metal-oxide-semiconductor S1, metal-oxide-semiconductor S2, metal-oxide-semiconductor S3, metal-oxide-semiconductor S4 in rectification circuit.Work as primary
When metal-oxide-semiconductor Q1 shutdowns, i.e. PWM_Q1=0, level point=0 A；Level point=1 B；Level point=1 C；Level point=1 D；E level points
=0；PWM_S1=0, secondary metal-oxide-semiconductor S1, S2, S3, S4 are turned off；When primary metal-oxide-semiconductor Q1 is connected, i.e. PWM_Q1=1, electric current
Flow to metal-oxide-semiconductor Q1, Cr successively from positive pole, Lr, transformer primary side, secondary side induce upper just lower negative electric current, electric current is from pair
The lower end when upper end flows to CT, metal-oxide-semiconductor S1, Cout, S4, pair, the current direction through CT are from left to right i.e. DIR_CT=1, root
According to the logic of Fig. 3, level point=0 A can be obtained；Level point=0 B；Level point=1 C；D level points then keep laststate i.e.=
1；Level point=1 E；PWM_S1=1, i.e. metal-oxide-semiconductor S1, S4 are open-minded；Due to switching frequency fs<Resonant frequency fr, as shown in figure 4,
I.e. before the metal-oxide-semiconductor Q1 shutdown t2 moment, there are resonance current ir=exciting currents im, ir, primary side current of transformer is zero at this time,
Energy can not be transmitted to the back-end, and electric current is zero, PWM-Q1=1, DIR_CT=0 on secondary metal-oxide-semiconductor, and logic according to fig. 3 can obtain
To level point=1 A；B level points keep laststate=0；Level point=0 C；Level point=0 D；Level point=0 E；PWM_S1=
0, i.e. metal-oxide-semiconductor S1, S4 shutdowns；But since the presence of economize on electricity appearance and demagnetization capacitance will produce oscillation, after oscillation, DIR_CT=1, then
At this point, A level points=0, B level point=0；C level point=1, D level points keep laststate=0；PWM_S1=0, i.e. MOS
Pipe S1, S4 shutdown.As long as therefore resonance current=exciting current, no matter how how secondary current vibrates, and will not all open metal-oxide-semiconductor
S1、S4；So rectification shutdown module corresponds to the time of drive signal, this section when monitoring resonance current and equal exciting current in real time
Time is the secondary MOSFET turn-off times.
In one embodiment, setting DIR_CT is the current direction of Current Transmit, it is specified that electric current from left to right flows to
For high level, on the contrary is low level, and PWM_S3 is the drive signal of metal-oxide-semiconductor S3.The logic similar with driving metal-oxide-semiconductor Q1, A point electricity
Put down for PWM_Q2 and DIR_CT phases with and negate；B level points are A points and the signal after the coefficient rest-set flip-flops of PWM_Q2
Value；C level points be B and DIR_CT phases or；D level points are PWM_Q2 and the signal value after the coefficient rest-set flip-flops of C；E points
Level be PWM_Q2 and DIR_CT phases and；PWM_S2 level be D and E phases and.Primary metal-oxide-semiconductor is that the first master in switching circuit opens
Close metal-oxide-semiconductor Q1, the second main switch metal-oxide-semiconductor Q2, secondary metal-oxide-semiconductor is metal-oxide-semiconductor S1 in rectification circuit, metal-oxide-semiconductor S2, metal-oxide-semiconductor S3,
Metal-oxide-semiconductor S4.When primary metal-oxide-semiconductor Q2 is turned off, i.e. PWM_Q2=0, level point=0 A；Level point=1 B；Level point=1 C；D points
Level=1；Level point=0 E；PWM_S1=0, secondary metal-oxide-semiconductor S1, S2, S3, S4 are turned off；When primary metal-oxide-semiconductor Q2 is connected,
That is PWM_Q2=1, electric current flows to metal-oxide-semiconductor Q2 successively, transformer primary side, Lr, Cr, secondary side induce it is negative under positive electric current, electricity
For stream from the secondary upper end when lower end flows to metal-oxide-semiconductor S3, Cout, S2, CT, pair, the current direction through CT is i.e. DIR_CT from right to left
=0, obtain level point=0 A；Level point=0 B；Level point=1 C；D level points then keep laststate i.e.=1；E level points=
1；PWM_S3=1, i.e. metal-oxide-semiconductor S3, S2 are open-minded；Due to switching frequency fs<Resonant frequency fr, as shown in figure 4, i.e. in metal-oxide-semiconductor Q2
Before turning off the t5 moment, there are resonance current ir=exciting currents im, ir solid line, im broken line representations, transformer at this time
Primary current is zero, can not transmit energy to the back-end, and electric current is zero, PWM-Q1=1, DIR_CT=0 on secondary metal-oxide-semiconductor, can be obtained
To level point=1 A；B level points keep laststate=0；Level point=0 C；Level point=0 D；Level point=0 E；PWM_S3=
0, i.e. metal-oxide-semiconductor S3, S2 shutdowns；But since the presence of economize on electricity appearance and demagnetization capacitance will produce oscillation, after oscillation, DIR_CT=1, then
At this point, A level points=0, B level point=0；C level point=1, D level points keep laststate=0；PWM_S3=0, i.e. MOS
Pipe S3, S2 shutdown.As long as therefore resonance current=exciting current, no matter how how secondary current vibrates, and will not all open metal-oxide-semiconductor
S3、S2；So rectification shutdown module corresponds to the time of drive signal, this section when monitoring resonance current and equal exciting current in real time
Time is the secondary MOSFET turn-off times.
LLC synchronous rectificating device control methods, as shown in figure 5, including the following steps：
Driving switch pipe is connected, and output drive signal to switching circuit passes through the switch of drive signal driving switch circuit
Pipe is connected；
Detection electric current in real time detects the resonance current and exciting current of resonance circuit in real time；
Determine the synchronous rectification turn-off time, monitor resonance current in real time and when equal exciting current correspond to drive signal when
Between, the turn-off time of rectifying tube in current rectifying and wave filtering circuit is determined according to the time.
In one embodiment, it is preferred that step driving switch pipe conducting specially output drive signal to switching circuit
The grid of the grid of first main switch metal-oxide-semiconductor or the second main switch metal-oxide-semiconductor drives the first main switch metal-oxide-semiconductor by drive signal
Or second main switch metal-oxide-semiconductor conducting.
In one embodiment, it is preferred that it is specially to detect resonant inductance in resonance circuit in real time that step detects electric current in real time
On resonance current and resonance circuit in exciting current on magnetizing inductance.
A kind of electronic equipment, including memory, processor and storage are on a memory and the meter that can run on a processor
The step of calculation machine program, processor executes above-mentioned LLC synchronous rectificating devices control method.
A kind of computer readable storage medium is stored thereon with computer program, when computer program is executed by processor
The step of realizing above-mentioned LLC synchronous rectificating devices control method.
The present invention provides LLC synchronous rectificating devices, including input terminal, switching circuit, resonant network resistance, transformer, whole
Filter circuit, output end are flowed, further includes driving device, driving device includes drive module, resonant frequency detection module, excitation electricity
Stream surveys module, rectification turns off module, and drive module is connect with switching circuit, drive module output drive signal driving switch circuit
Conducting, resonant frequency detection module and exciting current detection module are connect with resonant network resistance respectively, and resonant frequency detects mould
Block obtains the resonance current of resonant network resistance, and resonance current is sent to rectification and turns off module, exciting current detection module
The exciting current of resonant network resistance is obtained, and exciting current is sent to rectification and turns off module, it is humorous that rectification turns off module reception
Shake electric current and exciting current, and monitors resonance current in real time and when equal exciting current corresponds to the time of drive signal.The present invention
Can effectively, fast and accurately determine the secondary MOSFET turn-off times, control simply, it is at low cost.
Each technical characteristic of above example can be combined arbitrarily, to keep description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield is all considered to be the range of this specification record.
Only several embodiments of the present invention are expressed for above example, the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, these are all within the scope of protection of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1.LLC synchronous rectificating device, including it is input terminal, switching circuit, resonant network resistance, transformer, current rectifying and wave filtering circuit, defeated
Outlet, it is characterised in that：Further include driving device, the driving device includes drive module, resonant frequency detection module, excitation
Electric current surveys module, rectification turns off module, and the drive module is connect with the switching circuit, the drive module output driving letter
Number driving switching circuit conducting, the resonant frequency detection module and the exciting current detection module respectively with it is described humorous
The lattice network that shakes connects, and the resonant frequency detection module obtains the resonance current of the resonant network resistance, and will be described humorous
The electric current that shakes is sent to the rectification shutdown module, and the exciting current detection module obtains the excitation electricity of the resonant network resistance
Stream, and the exciting current is sent to the rectification and turns off module, the rectification shutdown module receive the resonance current and
The exciting current, and while monitoring the resonance current and the equal exciting current in real time correspond to the drive signal when
Between.
2. LLC synchronous rectificating devices as described in claim 1, it is characterised in that：The current rectifying and wave filtering circuit includes by four
The rectification circuit and output capacitance, the output capacitance of metal-oxide-semiconductor full-bridge connection composition are connected in parallel on opposite in the rectification circuit
Between two metal-oxide-semiconductors.
3. LLC synchronous rectificating devices as claimed in claim 2, it is characterised in that：Further include Current Transmit, the electric current
Mutual inductor CT is connected between the secondary coil of the transformer and the rectification circuit.
4. LLC synchronous rectificating devices as described in claim 1, it is characterised in that：The switching circuit includes the first main switch
Metal-oxide-semiconductor and the second main switch metal-oxide-semiconductor, the drive module are opened with the grid of the first main switch metal-oxide-semiconductor and the second master respectively
The grid connection of metal-oxide-semiconductor is closed, the drive module output drive signal drives the first main switch metal-oxide-semiconductor and the second main switch
Metal-oxide-semiconductor is connected, and the resonant network resistance is in parallel with the second main switch metal-oxide-semiconductor.
5. LLC synchronous rectificating devices as described in claim 1, it is characterised in that：The resonant network resistance includes resonance electricity
Appearance, resonant inductance, magnetizing inductance, the resonant capacitance, resonant inductance, magnetizing inductance are sequentially connected in series, the magnetizing inductance and institute
State the primary coil both ends connection of transformer.
6.LLC synchronous rectificating device control methods, it is characterised in that include the following steps：
Driving switch pipe is connected, output drive signal to the switching circuit, and the switch electricity is driven by the drive signal
The switching tube on road is connected；
Detection electric current in real time detects the resonance current and exciting current of resonance circuit in real time；
It determines the synchronous rectification turn-off time, the driving is corresponded to when monitoring the resonance current and the equal exciting current in real time
The time of signal determines the turn-off time of rectifying tube in current rectifying and wave filtering circuit according to the time.
7. LLC synchronous rectificating devices control method as claimed in claim 6, it is characterised in that：The step driving switch pipe
Conducting is specially to export the drive signal to the grid or the second main switch of the first main switch metal-oxide-semiconductor of the switching circuit
The grid of metal-oxide-semiconductor drives the first main switch metal-oxide-semiconductor or the second main switch metal-oxide-semiconductor to be connected by the drive signal.
8. LLC synchronous rectificating devices control method as claimed in claim 6, it is characterised in that：The step detects electricity in real time
Stream is specially detected in resonance current and the resonance circuit in the resonance circuit on resonant inductance in real time on magnetizing inductance
Exciting current.
9. a kind of electronic equipment, including memory, processor and storage are on a memory and the calculating that can run on a processor
Machine program, which is characterized in that the processor realizes the step of any one of claim 6-8 methods when executing described program.
10. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program
The step of any one of claim 6-8 methods are realized when being executed by processor.
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| CN201810588640.7A CN108667307B (en) | 2018-06-08 | 2018-06-08 | LLC synchronous rectifying device, control method thereof, electronic equipment and storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109768711A (en) * | 2019-02-28 | 2019-05-17 | 深圳市西林电气技术有限公司 | A kind of synchronous commutating control circuit and method |
| CN109842302A (en) * | 2019-02-15 | 2019-06-04 | 矽力杰半导体技术(杭州)有限公司 | Series resonant converter and its primary side feedback control circuit and control method |
| CN111130357A (en) * | 2019-12-31 | 2020-05-08 | 杭州茂力半导体技术有限公司 | Resonant converter and control circuit and control method thereof |
| CN111541376A (en) * | 2020-04-13 | 2020-08-14 | 吉利汽车研究院（宁波）有限公司 | Power conversion circuit and direct current converter |
| CN114337290A (en) * | 2021-02-07 | 2022-04-12 | 华为数字能源技术有限公司 | Driving circuit of secondary rectifying circuit in power circuit |
| CN114325037A (en) * | 2021-11-19 | 2022-04-12 | 深圳市崧盛电子股份有限公司 | Excitation current detection device, power and wisdom lamp pole of resonant converter |
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| CN102437750A (en) * | 2011-10-31 | 2012-05-02 | 上海大学 | Digital control device and method of LLC (Logic Link Control) synchronous rectification resonant converter |
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| CN101895201A (en) * | 2010-07-23 | 2010-11-24 | 中兴通讯股份有限公司 | LLC (Logical Link Control) series resonance converter and drive method thereof |
| CN102355147A (en) * | 2011-10-28 | 2012-02-15 | 上海大学 | Digital control device and method for LLC (logical link control) synchronously-rectified resonant converter |
| CN102437750A (en) * | 2011-10-31 | 2012-05-02 | 上海大学 | Digital control device and method of LLC (Logic Link Control) synchronous rectification resonant converter |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842302A (en) * | 2019-02-15 | 2019-06-04 | 矽力杰半导体技术(杭州)有限公司 | Series resonant converter and its primary side feedback control circuit and control method |
| CN109768711A (en) * | 2019-02-28 | 2019-05-17 | 深圳市西林电气技术有限公司 | A kind of synchronous commutating control circuit and method |
| CN111130357A (en) * | 2019-12-31 | 2020-05-08 | 杭州茂力半导体技术有限公司 | Resonant converter and control circuit and control method thereof |
| CN111541376A (en) * | 2020-04-13 | 2020-08-14 | 吉利汽车研究院（宁波）有限公司 | Power conversion circuit and direct current converter |
| CN111541376B (en) * | 2020-04-13 | 2022-03-18 | 吉利汽车研究院（宁波）有限公司 | Power conversion circuit and direct current converter |
| CN114337290A (en) * | 2021-02-07 | 2022-04-12 | 华为数字能源技术有限公司 | Driving circuit of secondary rectifying circuit in power circuit |
| CN114325037A (en) * | 2021-11-19 | 2022-04-12 | 深圳市崧盛电子股份有限公司 | Excitation current detection device, power and wisdom lamp pole of resonant converter |
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