CN108900095A - The control method and device of full-bridge LLC converter - Google Patents
The control method and device of full-bridge LLC converter Download PDFInfo
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- CN108900095A CN108900095A CN201810981281.1A CN201810981281A CN108900095A CN 108900095 A CN108900095 A CN 108900095A CN 201810981281 A CN201810981281 A CN 201810981281A CN 108900095 A CN108900095 A CN 108900095A
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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
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of control method and device of full-bridge LLC converter.Wherein, this method includes：Determine the load parameter of full-bridge LLC converter；By Controlling model, the corresponding control model of load parameter is determined, wherein Controlling model is obtained using multi-group data by machine learning training, and every group of data in multi-group data include：Load parameter and the corresponding control model of load parameter, control model include at least one of：First control model, the second control model and third control model.The present invention solve the control mode of full-bridge LLC converter is easy to produce in the related technology cannot achieve Sofe Switch control lead to the technical problem that full-bridge LLC transducer effciency is lower and system reliability is lower.
Description
Technical field
The present invention relates to technical field of circuit control, a kind of control method in particular to full-bridge LLC converter and
Device.
Background technique
LLC resonant converter has more advantages compared to other converters, for example, in entire loading range (including underloading)
Under be all with zero voltage switch conditional operation, to realize high efficiency；Working frequency variation range is relatively narrow, is convenient for high frequency transformer
With the design of input filter；The primary side voltage stress used switched is clamped on input voltage, and secondary primary side two
Voltage on diode is consistently equal to twice of central shaft heads transformer output voltage.However the control for full-bridge LLC converter
System, under normal circumstances, when the light load of full-bridge LLC converter, with the reduction of load, only by pulse frequency modulated
PFM carries out frequency modulation control, and frequency will be raised to very high and be difficult to realize.At this time, it may be necessary to pulse width modulation (PWM) and pulse frequency
Modulation PFM is adjusted simultaneously, under both modulating modes, can there is some problems, for example, switching tube cannot achieve soft open
Control is closed, the working efficiency of circuit is reduced；Free concussion can occur between resonant cavity and the parasitic capacitance of metal-oxide-semiconductor, thus band
Carry out the stress problem of switching tube.
It cannot achieve Sofe Switch control for above-mentioned be easy to produce in the related technology to the control mode of full-bridge LLC converter
Lead to the problem that full-bridge LLC transducer effciency is lower and system reliability is lower, not yet proposes effective solution side at present
Case.
Summary of the invention
The embodiment of the invention provides a kind of control method and device of full-bridge LLC converter, at least to solve related skill
Being easy to produce in art to the control mode of full-bridge LLC converter, which cannot achieve Sofe Switch and control, leads to full-bridge LLC transducer effciency
Lower and lower system reliability technical problem.
According to an aspect of an embodiment of the present invention, a kind of control method of full-bridge LLC converter is provided, including：Really
Determine the load parameter of full-bridge LLC converter；By Controlling model, the corresponding control model of the load parameter is determined, wherein institute
It states Controlling model and is obtained using multi-group data by machine learning training, every group of data in the multi-group data are wrapped
It includes：Load parameter and the corresponding control model of load parameter, the control model include at least one of：First control mould
Formula, the second control model and third control model, first control model are pulse frequency modulated PFM mode, described the
Two control models are the mode that pulse frequency modulated PFM mode and phase shifting control SP mode control simultaneously, and the third controls mould
Formula is phase shifting control SP mode；The full-bridge LLC converter is controlled according to the control model.
Optionally, by Controlling model, before determining the corresponding control model of the load parameter, full-bridge LLC becomes
The control method of parallel operation further includes：The multiple historic load parameters and multiple history control models in historical time section are acquired,
In, the multiple history control model is the mode determined according to the multiple historic load parameter；What it is to acquisition includes described
The multi-group data of multiple historic load parameters and the multiple history control model is trained, and obtains the Controlling model.
Optionally, by Controlling model, after determining the corresponding control model of the load parameter, full-bridge LLC becomes
The control method of parallel operation further includes：Determine the control parameter under the control model, wherein the control parameter includes following
At least one：Modulating frequency, the phase of phase shift.
Optionally it is determined that the control parameter under the control model includes：Obtain sampled data, wherein the sampling
Data are obtained by sample circuit measurement, and the sampled data includes：It is the input voltage of the full-bridge LLC converter, described complete
The output voltage of the input current of bridge LLC converter, the full-bridge LLC converter；The sampled data is handled, is obtained
The control parameter.
Optionally, the sampled data is handled, obtaining the control parameter includes：Based on closed-loop fashion to described
Sampled data is handled, wherein the closed-loop fashion is double circle controling mode, and the double circle controling mode includes：Electricity
Press outer ring, power inner ring；The control parameter is determined according to processing result.
Optionally, when determining the corresponding control model of the load parameter is the second control model, according to the control
Full-bridge LLC converter described in scheme control includes：Determine the switching sequence of the switching tube of the full-bridge LLC converter, wherein institute
Stating switching sequence includes：First timing, the second timing, third timing, the 4th timing and the 5th timing；In first timing
When, it controls first switch tube and third switching tube closure, second switch and the 4th switching tube disconnects；In second timing
When, it controls the second switch and third switching tube disconnects, the first switch tube and the 4th switching tube are closed；Institute
When stating third timing, controls the first switch tube and the third switching tube disconnects, second switch and the 4th switching tube are closed
It closes；In four timing, control controls the second switch and third switching tube closure, the first switch tube and described
4th switching tube disconnects；In five timing, first switch tube and third switching tube closure, second switch and the are controlled
Four switching tubes disconnect.
Another aspect according to an embodiment of the present invention, additionally provides a kind of control device of full-bridge LLC converter, wraps
It includes：First determination unit, for determining the load parameter of full-bridge LLC converter；Second determination unit, for passing through control mould
Type determines the corresponding control model of the load parameter, wherein the Controlling model is to pass through machine learning using multi-group data
What training obtained, every group of data in the multi-group data include：Load parameter and the corresponding control model of load parameter, institute
Stating control model includes at least one of：First control model, the second control model and third control model, described first
Control model is pulse frequency modulated PFM mode, and second control model is pulse frequency modulated PFM mode and phase shifting control
The mode that SP mode controls simultaneously, the third control model are phase shifting control SP mode；Control unit, for according to the control
Full-bridge LLC converter described in scheme control processed.
Optionally, the control device of full-bridge LLC converter further includes：Acquisition unit, for passing through Controlling model, really
Before determining the corresponding control model of the load parameter, acquire in multiple historic load parameters of historical time section and multiple history
Control model, wherein the multiple history control model is the mode determined according to the multiple historic load parameter；It obtains single
Member, for being instructed to the multi-group data including the multiple historic load parameter and the multiple history control model of acquisition
Practice, obtains the Controlling model.
Optionally, the control device of full-bridge LLC converter further includes：Third determination unit, for passing through control mould
Type after determining the corresponding control model of the load parameter, determines the control parameter under the control model, wherein institute
Stating control parameter includes at least one of：Modulating frequency, the phase of phase shift.
Optionally, the third determination unit includes：First obtains module, for obtaining sampled data, wherein described to adopt
Sample data are obtained by sample circuit measurement, and the sampled data includes：It is the input voltage of the full-bridge LLC converter, described
The output voltage of the input current of full-bridge LLC converter, the full-bridge LLC converter；Second obtains module, for adopting to described
Sample data are handled, and the control parameter is obtained.
Optionally, the second acquisition module includes：Submodule is handled, for being based on closed-loop fashion to the sampled data
It is handled, wherein the closed-loop fashion is double circle controling mode, and the double circle controling mode includes：Outer voltage, function
Rate inner ring；Submodule is determined, for determining the control parameter according to processing result.
Optionally, described control unit includes：First determining module, for determining the corresponding control of the load parameter
When mode is the second control model, the switching sequence of the switching tube of the full-bridge LLC converter is determined, wherein when the switch
Sequence includes：First timing, the second timing, third timing, the 4th timing and the 5th timing；First control module, in institute
When stating the first timing, controls first switch tube and third switching tube closure, second switch and the 4th switching tube disconnect；Second control
Molding block disconnects, the first switch tube in second timing, controlling the second switch and third switching tube
It is closed with the 4th switching tube；Third control module, for controlling the first switch tube and institute in the third timing
State the disconnection of third switching tube, second switch and the 4th switching tube closure；4th control module, in the 4th timing
When, control controls the second switch and third switching tube closure, the first switch tube and the 4th switching tube disconnect；The
Five control modules control first switch tube and third switching tube closure, second switch and the in five timing
Four switching tubes disconnect.
Another aspect according to an embodiment of the present invention, additionally provides a kind of storage medium, the storage medium includes
The program of storage, wherein described program execute it is any one of above-mentioned described in full-bridge LLC converter control method.
Another aspect according to an embodiment of the present invention, additionally provides a kind of processor, the processor is for running
Program, wherein described program run when execute it is any one of above-mentioned described in full-bridge LLC converter control method.
In embodiments of the present invention, using the load parameter for determining full-bridge LLC converter；By Controlling model, determine negative
Carry the corresponding control model of parameter, wherein Controlling model is obtained using multi-group data by machine learning training, multiple groups number
Every group of data in include：Load parameter and the corresponding control model of load parameter, control model include it is following at least it
One：First control model, the second control model and third control model, the first control model are pulse frequency modulated PFM mould
Formula, the second control model are the mode that pulse frequency modulated PFM mode and phase shifting control SP mode control simultaneously, and third controls mould
Formula is phase shifting control SP mode；Full-bridge LLC converter is controlled according to control model.The full-bridge provided through the embodiment of the present invention
The control method of LLC converter not only increases full-bridge LLC converter in efficiency at light load, reduces its thermal stress, and
The Voltage force stress for largely reducing metal-oxide-semiconductor, improves the reliability of system, so solve it is right in the related technology
The control mode of full-bridge LLC converter, which is easy to produce to cannot achieve Sofe Switch and control, causes full-bridge LLC transducer effciency lower, with
And the technical problem that system reliability is lower.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present invention, constitutes part of this application, this hair
Bright illustrative embodiments and their description are used to explain the present invention, and are not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the control method of full-bridge LLC converter according to an embodiment of the present invention；
Fig. 2 is the schematic diagram of full-bridge LLC converter according to an embodiment of the present invention；
Fig. 3 is the hardware block diagram of the control method of full-bridge LLC converter according to an embodiment of the present invention；
Fig. 4 is the logic chart of the control system of full-bridge LLC converter according to an embodiment of the present invention；
Fig. 5 is the phase shifting control loop block diagram of full-bridge LLC converter according to an embodiment of the present invention；
Fig. 6 is that the pulse frequency modulated PFM mode according to an embodiment of the present invention that is based on controls full-bridge LLC converter
Timing diagram；
Fig. 7 is according to an embodiment of the present invention right simultaneously based on pulse frequency modulated PFM mode and phase shifting control SP mode
The timing diagram that full-bridge LLC converter is controlled；
Fig. 8 is the schematic diagram of the control device of full-bridge LLC converter according to an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The model that the present invention protects all should belong in member's every other embodiment obtained without making creative work
It encloses.
It should be noted that description and claims of this specification and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, for example, the process, method, system, product or equipment for containing a series of steps or units are not necessarily limited to
Step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, product
Or other step or units that equipment is intrinsic.
For ease of description, the part noun or term that occur in the embodiment of the present invention are described in detail below.
Pulse frequency modulated (pulse frequency modulat ion, abbreviation PFM)：It is a kind of conversion method, usually
DC-DC converter is applied to improve light load efficiency.The frequency of modulated signal changes, duty with input signal amplitude
Than constant.Since modulated signal is usually the square-wave signal of frequency variation, PFM is also referred to as square wave FM.
Pulse width modulates (pulse width modulat ion, abbreviation PWM)：It is defeated using the number of microprocessor
A kind of technology that analog circuit is controlled out, according to the variation of respective loads come modulation transistor base stage or metal-oxide-semiconductor
The biasing of grid, to realize the change of transistor or metal-oxide-semiconductor turn-on time, to realize the change of switching power supply output.
DC-DC：It is a kind of shape of electric energy that the electric energy of a voltage value is become to another voltage value in DC circuit
State uses microelectric technique, and small-sized surface mount integrated circuit and miniature electronic component group are integrally constituted.
Magnetizing inductance：Refer to that the primary inductance of pulse transformer, the evaluation of magnetizing inductance are smaller；In core sataration
When numerical value fluctuated between the larger value and smaller value.
Sofe Switch：It is the switching process using soft switch technique, is for inductive switch.By in switching process
Front and back introduces resonance, is that voltage first drops to zero before opening, electric current drops to zero before turning off, so that it may eliminate electric in switching process
The overlapping of pressure, electric current, reduces their change rate, so that significantly smaller even be eliminated switching loss.
Metal-oxide-semicondutor (Metal-Oxide-Semiconductor, abbreviation MOS)：It is metal-oxide-
Semiconductor field effect transistor.
Stress：Object due to it is outer thus deform when, in the internal force for generating interaction in object between each section, to support
Resist the effect of this external cause, and attempts that object is made to be restored to the position before deformation from deformed position.
Bus：Refer to that multiple equipment connects a shared access on it in the form of branch arranged side by side.
Metal-oxide semiconductor fieldeffect transistor (Metal-Oxide-Semiconductor Field-
EffectTrans istor, abbreviation MOS)：It is a kind of field effect transistor that can be widely used in analog circuit and digital circuit
Pipe.
Duty ratio：Refer in a pulse cycle, conduction time is relative to ratio shared by total time.
Thermal stress：When temperature changes, object makes it not due to the mutual constraint between external restraint and internal each section
It can free to contract and expand and the stress that generates completely.
Load：Refer to the electronic component of the both ends of power of connection in circuit.Common load is by resistance, engine and light bulb
Etc. the element that can consume power.The device that the energy of other forms can be converted electrical energy into is known as loading.
Closed-loop control：Refer to as controlled output in a certain way back to the input terminal as control, and to input
End applies a kind of control planning that control influences.After operator's activation system, by system operation will control information transfer to by
Object is controlled, and by the status information feedback of controll plant into input, to correct operating process, the output of system is made to meet expection
It is required that.
Embodiment 1
According to embodiments of the present invention, a kind of embodiment of the method for the control method of full-bridge LLC converter is provided, is needed
Bright, step shown in the flowchart of the accompanying drawings can be held in a computer system such as a set of computer executable instructions
Row, although also, logical order is shown in flow charts, and it in some cases, can be to be different from sequence herein
Execute shown or described step.
Fig. 1 is the flow chart of the control method of full-bridge LLC converter according to an embodiment of the present invention, as shown in Figure 1, this is complete
The control method of bridge LLC converter includes the following steps：
Step S102 determines the load parameter of full-bridge LLC converter.
It should be noted that in embodiments of the present invention LLC be it is a kind of by control switch frequency (frequency adjusting) come reality
The constant resonance circuit of existing output voltage.
Wherein, Fig. 2 is the schematic diagram of full-bridge LLC converter according to an embodiment of the present invention, as shown in Fig. 2, Vin is input
Voltage (is terminated with rectification circuit, be bus capacitor) before if, S1, S2, S3, S4 are N-type switch mosfet pipe, and Lr is resonance
Inductance, Cr are resonant capacitance, and T1 is transformer, and Lm is the magnetizing inductance of transformer, and D1, D2 are the output two of full-wave rectifying circuit
Pole pipe, Co are output filter capacitor, and R is load, output voltage Vo.In addition, ILr indicates the flow direction of resonance current.
Step S104 determines the corresponding control model of load parameter by Controlling model, wherein Controlling model is to use
Multi-group data is obtained by machine learning training, and every group of data in multi-group data include：Load parameter and load parameter
Corresponding control model, control model include at least one of：First control model, the second control model and third control
Mode, the first control model are pulse frequency modulated PFM mode, and the second control model is pulse frequency modulated PFM mode and shifting
The mode that phase control SP mode controls simultaneously, third control model are phase shifting control SP mode.
Step S106 controls full-bridge LLC converter according to control model.
Through the above steps, the load parameter of full-bridge LLC converter can be determined；Simultaneously by Controlling model, determine negative
Carry the corresponding control model of parameter, wherein Controlling model is obtained using multi-group data by machine learning training, multiple groups number
Every group of data in include：Load parameter and the corresponding control model of load parameter, control model include it is following at least it
One：First control model, the second control model and third control model, the first control model are pulse frequency modulated PFM mould
Formula, the second control model are the mode that pulse frequency modulated PFM mode and phase shifting control SP mode control simultaneously, and third controls mould
Formula is phase shifting control SP mode；And full-bridge LLC converter is controlled according to control model.Relative in the related technology to full-bridge LLC
The control mode of converter, which is easy to produce switching tube, cannot achieve Sofe Switch, reduce the efficiency of circuit, and resonant cavity and metal-oxide-semiconductor
Parasitic capacitance between can occur freely to shake to bring switching tube stress the drawbacks of.It provides through the embodiment of the present invention
The control method of full-bridge LLC converter not only increases full-bridge LLC converter in efficiency at light load, reduces its thermal stress,
And the Voltage force stress of metal-oxide-semiconductor is largely reduced, the reliability of system is improved, and then solve the relevant technologies
In the control mode of full-bridge LLC converter is easy to produce cannot achieve Sofe Switch control cause full-bridge LLC transducer effciency compared with
Low and lower system reliability technical problem.
The corresponding control model of load parameter is determined by Controlling model as an optional embodiment of the present invention
Before, the control method of full-bridge LLC converter can also include：Acquire historical time section multiple historic load parameters and
Multiple history control models, wherein multiple history control models are the modes determined according to multiple historic load parameters；To acquisition
Include that the multi-group data of multiple historic load parameters and multiple history control models is trained, obtain Controlling model.
Preferably, passing through Controlling model, after determining the corresponding control model of load parameter, full-bridge LLC converter
Control method can also include：Determine control parameter under control model, wherein control parameter include it is following at least it
One：Modulating frequency, the phase of phase shift.
Specifically, it is determined that the control parameter under control model may include：Obtain sampled data, wherein sampled data
It is to be obtained by sample circuit measurement, sampled data includes：The input of the input voltage, full-bridge LLC converter of full-bridge LLC converter
The output voltage of electric current, full-bridge LLC converter；Sampled data is handled, control parameter is obtained.
Fig. 3 is the hardware block diagram of the control method of full-bridge LLC converter according to an embodiment of the present invention, as shown in figure 3, removing
It further include three ports being connect with sample circuit except including each device described in Fig. 2：Vins, I ins and Vos.
Wherein, sample circuit can sample input voltage, input current and output voltage by above three port.Fig. 4
It is the logic chart of the control system of full-bridge LLC converter according to an embodiment of the present invention, as shown in figure 4, sample circuit can incite somebody to action
Obtained input voltage (sampling Vins), input current (sampled I ins) and output voltage (sampling Vos) is sampled to be input to.
Wherein, micro-control unit MCU may include：A/D converter, arithmetic unit and ePWM module.It is input to through over-sampling circuit micro-
Input voltage, input current and the output voltage of control unit MCU first passes around A/D converter and is converted, and will conversion
Result afterwards is input in arithmetic unit, after arithmetic unit calculates, is input to ePWM module, and will calculate and tie by the ePWM module
Fruit is transferred to driving circuit, so driving circuit can be realized according to calculated result in full-bridge LLC converter switching tube S1,
The switch control of S2, S3 and S4.
As an optional embodiment of the present invention, sampled data is handled, obtaining control parameter may include：Base
Sampled data is handled in closed-loop fashion, wherein closed-loop fashion is double circle controling mode, double circle controling mode packet
It includes：Outer voltage, power inner ring；Control parameter is determined according to processing result.
Fig. 5 is the phase shifting control loop block diagram of full-bridge LLC converter according to an embodiment of the present invention, as shown in figure 5, control
The operation of device is mainly to carry out the calculating of loop, this loop uses double-closed-loop control, i.e. outer voltage and power inner ring, such as Fig. 5
Shown, output voltage is carried out closed loop by outer ring, and using the output valve of outer voltage as the given value of power inner ring, input voltage
Value of feedback with the product of input current as power inner ring, the output of last loop is as a result, as pulse frequency modulated PFM mould
The phase of the adjustment frequency and phase shift of formula and phase shifting control SP mode.
The following specific embodiments are described below to the control method of full-bridge LLC converter provided in an embodiment of the present invention into
Row is described in detail.Wherein, in embodiments of the present invention, it is illustrated by taking three kinds of working conditions of full-bridge LLC converter as an example.
In the load parameter for determining full-bridge LLC converter according to step S102, determine that full-bridge LLC converter is in work shape
When state 1, full-bridge LLC converter can be controlled using pulse frequency modulated PFM mode (i.e. the first control model).For example,
When detecting that the load of LLC circuit output is larger, the duty ratio of switching tube is fixed value 50% (ignoring dead time), switching frequency
It is obtained by the operation result of loop, specific work process is as follows.At the t0 moment, S1 and S4 closure, S2 and S3 are disconnected, resonance current
The direction ILr is negative, and electric current passes through the afterflow of S1 and S4, and when resonance current ILr is reduced to zero, current direction is positive, S1 and S4
Forward conduction.At the t1 moment, S1 and S4 are disconnected, and S2 and S3 closure, the direction resonance current ILr remains unchanged at this time, by S2 and
The diode continuousing flow of S3, when electric current is reduced to zero, electric current is reversed, S2 and S3 forward conduction, and the direction resonance current ILr is negative.
Hereafter, it circuits sequentially and works.Fig. 6 is the pulse frequency modulated PFM mode according to an embodiment of the present invention that is based on to full-bridge LLC
The timing diagram that converter is controlled.
In the load parameter for determining full-bridge LLC converter according to step S102, determine that full-bridge LLC converter is in work shape
It, can be using the mode (i.e. the second control model) of pulse frequency modulated PFM mode and the control simultaneously of phase shifting control SP mode when state 2
Full-bridge LLC converter is controlled.
Specifically, it when determining the corresponding control model of load parameter is the second control model, is controlled according to control model
Full-bridge LLC converter may include：Determine the switching sequence of the switching tube of full-bridge LLC converter, wherein switching sequence includes：
First timing, the second timing, third timing, the 4th timing and the 5th timing；In the first timing, control first switch tube and
Third switching tube closure, second switch and the 4th switching tube disconnect；In the second timing, controls second switch and third is opened
Close pipe disconnection, first switch tube and the 4th switching tube closure；In third timing, controls first switch tube and third switching tube is disconnected
It opens, second switch and the 4th switching tube closure；In four timing, control control second switch and third switching tube closure,
First switch tube and the 4th switching tube disconnect；In five timing, controls first switch tube and third switching tube is closed, second opens
It closes pipe and the 4th switching tube disconnects.
For example, when on the basis of working condition 1, when detecting that load is reduced to predetermined load parameter, full-bridge LLC at this time
Converter works in working condition 2, at this moment only cannot achieve the requirement of output by pulse frequency modulated PFM mode.It passes
The control method of system is the control strategy using pulse frequency modulated PFM mode and pulse width modulation (PWM) mode mixture.But
It is, with the reduction of load, while using the control of pulse frequency modulated PFM mode and pulse width modulation (PWM) mode mixture
When tactful, when duty ratio is small arrives a certain predetermined value, LLC circuit will be unable to realize Sofe Switch, and 4 metal-oxide-semiconductors are hard switchings.If
Resonance current is smaller, and free oscillation can be also generated in resonant cavity, and the stress for switching metal-oxide-semiconductor increases.If in this load shape
Under state, the hybrid control strategy controlled simultaneously using pulse frequency modulated PFM mode and phase shifting control SP mode, can be solved with
Upper problem.In this case, the modulating frequency of switching tube and effective duty cycle are obtained by loop operation, the switching sequence of switching tube
As described below, it is assumed that t0 moment (i.e. the first timing), metal-oxide-semiconductor S1 (i.e. first switch tube) and S3 (i.e. third switching tube) closure,
S2 (i.e. second switch) and S4 (i.e. the 4th switching tube) is disconnected, and resonance current ILr is negative, and electric current flows through S1 and S3.As t1
Carve (i.e. the second timing), S2 and S3 are disconnected, and S1 and S4 closure, direction of resonant current is constant to be still negative, resonance current by S1 and
S4 carries out afterflow, creates conditions to open for S1 and S4 no-voltage, and when direction of resonant current, S1 and S4 forward conduction is real
Sofe Switch is showed；In t2 moment (i.e. third timing), S1 and S3 are simultaneously switched off, and S2 and S4 conducting, direction of resonant current are positive, and
Resonance current flows through S2 and S4.In t3 moment (i.e. the 4th timing), S2 and S3 closure, S1 and S4 are disconnected, and resonance current is kept just
To circulation, by S2 and S3 afterflow, when resonance current is reversed, S2 and S3 forward conduction, resonance current is negative, until the t4 moment
(i.e. the 5th timing), S1 and S3 are open-minded, and S2 and S4 are disconnected, and are recycled to the state at t0 moment, specific timing See Figure 7, wherein
Fig. 7 is according to an embodiment of the present invention based on pulse frequency modulated PFM mode and phase shifting control SP mode while to full-bridge LLC change
The timing diagram that parallel operation is controlled.In the whole process, Sofe Switch may be implemented in metal-oxide-semiconductor, and is not in free oscillation
Phenomenon.
In addition, determining that full-bridge LLC converter is in the load parameter for determining full-bridge LLC converter according to step S102
When working condition 3, full-bridge LLC converter can be controlled using phase shifting control SP mode (i.e. the second control model).
Specifically, on the basis of working condition 2, when detecting that load continues to reduce, frequency, which has increased to, at this time is set
Fixed maximum value can not be further continued for increasing, and enter phase shifting control SP regulation and control model at this time, the work of full-bridge LLC converter is in work shape
State 3, under the working condition, the modulating frequency of switching tube is fixed value, and effective duty cycle is obtained by the operation of loop.Specifically
Scheme is as follows：At the t0 moment, metal-oxide-semiconductor S1 and S4 is open-minded, and resonance current is positive, and S2 and S3 are disconnected.At the t1 moment, S1 and S3 are closed
It is disconnected, S2 and S4 closure.At the t2 moment, S2 and S3 are open-minded, behind metal-oxide-semiconductor open and close timing.
The control method of the full-bridge LLC converter provided through the embodiment of the present invention, at light load, using pulse frequency tune
The hybrid control strategy for the mode that PFM mode and phase shifting control SP mode processed control simultaneously, regulates and controls full-bridge LLC circuit,
The Sofe Switch of LLC circuit under the state not only may be implemented, but also can be to avoid generation free oscillation phenomenon.In addition, when negative
When load continues to reduce, using phase shifting control strategy, the Sofe Switch of full-bridge LLC circuit under the state can also be realized, and will not generate
The phenomenon that free oscillation.
Embodiment 2
A kind of control device of full-bridge LLC converter is additionally provided according to embodiments of the present invention, it should be noted that this hair
The control device of the full-bridge LLC converter of bright embodiment can be used for executing the transformation of full-bridge LLC provided by the embodiment of the present invention
The control method of device.The control device of full-bridge LLC converter provided in an embodiment of the present invention is introduced below.
Fig. 8 is the schematic diagram of the control device of full-bridge LLC converter according to an embodiment of the present invention, as shown in figure 8, this is complete
The control device of bridge LLC converter includes：First determination unit 81, the second determination unit 83 and control unit 85.It is right below
The control device of full-bridge LLC converter is described in detail.
First determination unit 81, for determining the load parameter of full-bridge LLC converter.
Second determination unit 83, for determining the corresponding control model of load parameter by Controlling model, wherein control
Model is obtained using multi-group data by machine learning training, and every group of data in multi-group data include：Load parameter
Control model corresponding with load parameter, control model include at least one of：First control model, the second control model with
And third control model, the first control model are pulse frequency modulated PFM mode, the second control model is pulse frequency modulated
The mode that PFM mode and phase shifting control SP mode control simultaneously, third control model are phase shifting control SP mode.
Control unit 85, for controlling full-bridge LLC converter according to control model.
In this embodiment it is possible to determine the load parameter of full-bridge LLC converter using the first determination unit；Second determines
Unit, for determining the corresponding control model of load parameter by Controlling model, wherein Controlling model is to use multi-group data
It is obtained by machine learning training, every group of data in multi-group data include：Load parameter and the corresponding control of load parameter
Molding formula, control model include at least one of：First control model, the second control model and third control model, the
One control model is pulse frequency modulated PFM mode, and the second control model is pulse frequency modulated PFM mode and phase shifting control SP
The mode that mode controls simultaneously, third control model are phase shifting control SP mode；Control unit, for being controlled according to control model
Full-bridge LLC converter.Being easy to produce switching tube relative to the control mode in the related technology to full-bridge LLC converter cannot achieve
Sofe Switch reduces the efficiency of circuit, and can occur freely to shake between resonant cavity and the parasitic capacitance of metal-oxide-semiconductor to bring to hold
The drawbacks of closing the stress of pipe.The control method of the full-bridge LLC converter provided through the embodiment of the present invention not only increases full-bridge
LLC converter reduces its thermal stress in efficiency at light load, and the Voltage force for largely reducing metal-oxide-semiconductor is answered
Power, improves the reliability of system, and then solves and be easy to produce nothing to the control mode of full-bridge LLC converter in the related technology
Method realizes that Sofe Switch control leads to the technical problem that full-bridge LLC transducer effciency is lower and system reliability is lower.
As an optional embodiment of the present invention, the control device of full-bridge LLC converter can also include：Acquisition is single
Member, for by Controlling model, before determining the corresponding control model of load parameter, acquisition to be gone through in the multiple of historical time section
History load parameter and multiple history control models, wherein multiple history control models are determined according to multiple historic load parameters
Mode；Acquiring unit, for the multi-group data including multiple historic load parameters and multiple history control models to acquisition
It is trained, obtains Controlling model.
As an optional embodiment of the present invention, the control device of full-bridge LLC converter can also include：Third is true
Order member, for after determining the corresponding control model of load parameter, determining the control under control model by Controlling model
Parameter processed, wherein control parameter includes at least one of：Modulating frequency, the phase of phase shift.
As an optional embodiment of the present invention, above-mentioned third determination unit may include：First obtains module, is used for
Obtain sampled data, wherein sampled data is obtained by sample circuit measurement, and sampled data includes：Full-bridge LLC converter it is defeated
Enter the output voltage of voltage, the input current of full-bridge LLC converter, full-bridge LLC converter；Second obtains module, for adopting
Sample data are handled, and control parameter is obtained.
As an optional embodiment of the present invention, above-mentioned second acquisition module may include：Submodule is handled, base is used for
Sampled data is handled in closed-loop fashion, wherein closed-loop fashion is double circle controling mode, double circle controling mode packet
It includes：Outer voltage, power inner ring；Submodule is determined, for determining control parameter according to processing result.
As an optional embodiment of the present invention, above-mentioned control unit may include：First determining module, for true
When the corresponding control model of fixed load parameter is the second control model, the switching sequence of the switching tube of full-bridge LLC converter is determined,
Wherein, switching sequence includes：First timing, the second timing, third timing, the 4th timing and the 5th timing；First control mould
Block, it is disconnected in the first timing, controlling first switch tube and third switching tube closure, second switch and the 4th switching tube
It opens；Second control module, in the second timing, control second switch and third switching tube disconnect, first switch tube and
4th switching tube closure；Third control module, disconnected in third timing, controlling first switch tube and third switching tube,
Second switch and the 4th switching tube closure；4th control module, in four timing, control control second switch and the
Three switching tubes closure, first switch tube and the 4th switching tube disconnect；5th control module, in five timing, control the
One switching tube and third switching tube closure, second switch and the 4th switching tube disconnect.
The control device of above-mentioned full-bridge LLC converter includes processor and memory, above-mentioned first determination unit 81, and second
Determination unit 83 and control unit 85 etc. store in memory as program unit, are stored in storage by processor execution
Above procedure unit in device realizes corresponding function.
Include kernel in above-mentioned processor, is gone in memory to transfer corresponding program unit by kernel.Kernel can be set
One or more controls full-bridge LLC converter according to control model by adjusting kernel parameter.
Above-mentioned memory may include the non-volatile memory in computer-readable medium, random access memory
(RAM) and/or the forms such as Nonvolatile memory, such as read-only memory (ROM) or flash memory (flash RAM), memory includes extremely
A few storage chip.
Another aspect according to an embodiment of the present invention, additionally provides a kind of storage medium, and storage medium includes storage
Program, wherein program executes the control method of any one of above-mentioned full-bridge LLC converter.
Another aspect according to an embodiment of the present invention additionally provides a kind of processor, and processor is used to run program,
Wherein, the control method of any one of above-mentioned full-bridge LLC converter is executed when program is run.
A kind of equipment is additionally provided in embodiments of the present invention, which includes processor, memory and be stored in storage
On device and the program that can run on a processor, processor realize following steps when executing program：Determine full-bridge LLC converter
Load parameter；By Controlling model, the corresponding control model of load parameter is determined, wherein Controlling model is to use multi-group data
It is obtained by machine learning training, every group of data in multi-group data include：Load parameter and the corresponding control of load parameter
Molding formula, control model include at least one of：First control model, the second control model and third control model, the
One control model is pulse frequency modulated PFM mode, and the second control model is pulse frequency modulated PFM mode and phase shifting control SP
The mode that mode controls simultaneously, third control model are phase shifting control SP mode；Full-bridge LLC transformation is controlled according to control model
Device.
A kind of computer program product is additionally provided in embodiments of the present invention, when being executed on data processing equipment,
It is adapted for carrying out the program of initialization there are as below methods step：Determine the load parameter of full-bridge LLC converter；By Controlling model,
Determining the corresponding control model of load parameter, wherein Controlling model is obtained using multi-group data by machine learning training,
Every group of data in multi-group data include：Load parameter and the corresponding control model of load parameter, control model include following
At least one：First control model, the second control model and third control model, the first control model are pulse frequency modulated
PFM mode, the second control model are the mode that pulse frequency modulated PFM mode and phase shifting control SP mode control simultaneously, third
Control model is phase shifting control SP mode；Full-bridge LLC converter is controlled according to control model.
The serial number of the above embodiments of the invention is only for description, does not represent the advantages or disadvantages of the embodiments.
In the above embodiment of the invention, it all emphasizes particularly on different fields to the description of each embodiment, does not have in some embodiment
The part of detailed description, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, such as the division of the unit, Ke Yiwei
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of unit or module
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
On unit.It can some or all of the units may be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can for personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-OnlyMemory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic or disk etc. be various to can store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of control method of full-bridge LLC converter, which is characterized in that including：
Determine the load parameter of full-bridge LLC converter；
By Controlling model, the corresponding control model of the load parameter is determined, wherein the Controlling model is to use multiple groups number
According to what is obtained by machine learning training, every group of data in the multi-group data include：Load parameter and load parameter pair
The control model answered, the control model include at least one of：First control model, the second control model and third control
Molding formula, first control model are pulse frequency modulated PFM mode, and second control model is pulse frequency modulated
The mode that PFM mode and phase shifting control SP mode control simultaneously, the third control model are phase shifting control SP mode；
The full-bridge LLC converter is controlled according to the control model.
2. the method according to claim 1, wherein determining that the load parameter is corresponding by Controlling model
Control model before, further include：
Acquire the multiple historic load parameters and multiple history control models in historical time section, wherein the multiple history control
Molding formula is the mode determined according to the multiple historic load parameter；
The multi-group data including the multiple historic load parameter and the multiple history control model of acquisition is trained,
Obtain the Controlling model.
3. the method according to claim 1, wherein determining that the load parameter is corresponding by Controlling model
Control model after, further include：
Determine the control parameter under the control model, wherein the control parameter includes at least one of：Modulation frequency
Rate, the phase of phase shift.
4. according to the method described in claim 3, it is characterized in that, determining that the control parameter under the control model includes：
Obtain sampled data, wherein the sampled data is obtained by sample circuit measurement, and the sampled data includes：It is described
The input voltage of full-bridge LLC converter, the input current of the full-bridge LLC converter, the output of the full-bridge LLC converter are electric
Pressure；
The sampled data is handled, the control parameter is obtained.
5. according to the method described in claim 4, obtaining the control it is characterized in that, handle the sampled data
Parameter includes：
The sampled data is handled based on closed-loop fashion, wherein the closed-loop fashion is double circle controling mode, described
Double circle controling mode includes：Outer voltage, power inner ring；
The control parameter is determined according to processing result.
6. according to the method described in claim 5, it is characterized in that, determining that the corresponding control model of the load parameter is the
When two control models, controlling the full-bridge LLC converter according to the control model includes：
Determine the switching sequence of the switching tube of the full-bridge LLC converter, wherein the switching sequence includes：First timing,
Two timing, third timing, the 4th timing and the 5th timing；
In first timing, controls first switch tube and third switching tube closure, second switch and the 4th switching tube are disconnected
It opens；
In second timing, control the second switch and third switching tube disconnect, the first switch tube and described
4th switching tube closure；
In the third timing, the first switch tube and third switching tube disconnection, second switch and the 4th are controlled
Switching tube closure；
In four timing, control controls the second switch and third switching tube closure, the first switch tube and institute
State the disconnection of the 4th switching tube；
In five timing, controls first switch tube and third switching tube closure, second switch and the 4th switching tube are disconnected
It opens.
7. a kind of control device of full-bridge LLC converter, which is characterized in that including：
First determination unit, for determining the load parameter of full-bridge LLC converter；
Second determination unit, for determining the corresponding control model of the load parameter, wherein the control by Controlling model
Simulation is obtained using multi-group data by machine learning training, and every group of data in the multi-group data include：It is negative
It carries parameter and the corresponding control model of load parameter, the control model includes at least one of：First control model, second
Control model and third control model, first control model are pulse frequency modulated PFM mode, the second control mould
Formula is the mode that pulse frequency modulated PFM mode and phase shifting control SP mode control simultaneously, and the third control model is phase shift
Control SP mode；
Control unit, for controlling the full-bridge LLC converter according to the control model.
8. device according to claim 7, which is characterized in that further include：
Acquisition unit, for before determining the corresponding control model of the load parameter, acquiring in history by Controlling model
The multiple historic load parameters and multiple history control models of period, wherein the multiple history control model is according to institute
State the mode that multiple historic load parameters determine；
Acquiring unit, for the multiple groups including the multiple historic load parameter and the multiple history control model to acquisition
Data are trained, and obtain the Controlling model.
9. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein described program right of execution
Benefit require any one of 1 to 6 described in full-bridge LLC converter control method.
10. a kind of processor, which is characterized in that the processor is for running program, wherein right of execution when described program is run
Benefit require any one of 1 to 6 described in full-bridge LLC converter control method.
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