CN108667299A - A kind of method and relevant apparatus improving LLC resonant converter reliability - Google Patents
A kind of method and relevant apparatus improving LLC resonant converter reliability Download PDFInfo
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- CN108667299A CN108667299A CN201710207415.XA CN201710207415A CN108667299A CN 108667299 A CN108667299 A CN 108667299A CN 201710207415 A CN201710207415 A CN 201710207415A CN 108667299 A CN108667299 A CN 108667299A
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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
A kind of method and relevant apparatus improving LLC resonant converter reliability, the intrinsic parameter information of LLC resonant converter and the parameter information of characterization LLC resonant converter current load situation can be obtained, and according to the working characteristics information of intrinsic parameter information, the parameter information of characterization LLC resonant converter current load situation and pre-stored LLC resonant converter, determine so that LLC resonant converter is operated in the lowest operating frequency value in the regions ZVS；If it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting is less than the lowest operating frequency value, then adjusting the minimum value of the value range of working frequency makes it be not less than the lowest operating frequency value；That is, the minimum value of the working frequency of LLC resonant converter can in real time be adjusted according to loading condition, it is ensured that LLC resonant converter always works in ZVS patterns, effectively improves the reliability of LLC resonant converter.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of methods and phase improving LLC resonant converter reliability
Close device.
Background technology
Currently, Switching Power Supply just develops towards high power density and efficient direction, LLC resonant converter is excellent because of its
Sofe Switch characteristic and boost capability, just have been more and more widely used.
It is the working characteristics schematic diagram of LLC resonant converter as shown in Figure 1, wherein ordinate is the exhausted of voltage conversion ratio
To value, abscissa is the ratio between the resonant frequency fr of the working frequency fs and LLC resonant converter of LLC resonant converter, and Qs is product
Prime factor.According to the DC current gain characteristic of LLC resonant converter, its operating mode can be divided into three working regions, area
Domain 1 and region 2 are the regions ZVS (pattern), and region 3 is the regions ZCS (pattern).For MOSFET (Metal-Oxide-
Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor field-effect transistor) for, ZVS
The switching loss of the switching loss ratio ZCS patterns of pattern is small.
Silicon substrate MOSFET body diodes can be used as the primary side switch device of LLC resonant converter.Two pole of silicon substrate MOSFET bodies
Pipe will produce very big reverse recovery current when turning off, therefore, when using LLC resonance of the silicon substrate MOSFET as primary side switch device
When converter is operated in the regions ZCS, excessively high reverse recovery current and switching loss can make the reliability of the switching device
At seriously affecting, thus, LLC resonant converter, which is commonly designed, is operated in the regions ZVS, and avoids being operated in the regions ZCS.But
If not increasing additional counter-measure, LLC resonant converter still can be inevitable in booting, load jump and input saltus step
Ground enters the regions ZCS, leads to the reduction of its reliability.
To solve the above problems, the common method of industry has at present：Restore using the MOSFET of silicon carbide material, using fast
The silicon material MOSFET of characteristic, the higher MOSFET of through-current capability, or use better radiator of heat dissipation performance etc. are used.On but
The hardware cost of LLC resonant converter can be increased by stating measure all.
Invention content
An embodiment of the present invention provides a kind of methods and relevant apparatus improving LLC resonant converter reliability, to solve
Certainly use silicon substrate MOSFET body diodes as primary side switch device LLC resonant converter due to booting, load jump and
It inputs and is operated in the problem that the regions ZCS cause the reliability caused by MOSFET failure low when saltus step.
An embodiment of the present invention provides it is a kind of improve LLC resonant converter reliability method, the method includes：
Obtain the intrinsic parameter information and the characterization LLC resonant converter current load situation of LLC resonant converter
Parameter information；Wherein, the intrinsic parameter information includes the inductance value, described of the resonant inductance of the LLC resonant converter
The inductance value of the primary coil of the transformer of the capacitance of the resonant capacitance of LLC resonant converter, the LLC resonant converter with
And the secondary side turn ratio of original of the transformer of the LLC resonant converter；
According to the intrinsic parameter information, the characterization LLC resonant converter current load situation got
The working characteristics information of parameter information and the pre-stored LLC resonant converter determines so that the LLC resonant transformations
Device is operated in the lowest operating frequency value in the regions ZVS；
If it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting is less than described
Lowest operating frequency value, then adjusting the minimum value of the value range of the working frequency makes it be not less than the lowest operating frequency
Value；Wherein, the working frequency of the LLC resonant converter is the drive signal for the switching tube for driving the LLC resonant converter
Frequency.
Optionally, the parameter information of the characterization LLC resonant converter current load situation includes：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
Optionally, the LLC resonant converter include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or
Any one in asymmetrical half-bridge LLC resonant converter.
Correspondingly, the embodiment of the present invention additionally provides a kind of computer readable storage medium, the computer-readable storage
Media storage has computer executable instructions, and the computer executable instructions are for making computer execute any above-mentioned raising
The method of LLC resonant converter reliability.
Correspondingly, the embodiment of the present invention additionally provides a kind of device improving LLC resonant converter reliability, including：
Acquiring unit, the intrinsic parameter information for obtaining LLC resonant converter and the characterization LLC resonant converter
The parameter information of current load situation；Wherein, the intrinsic parameter information includes the resonant inductance of the LLC resonant converter
The primary side line of the transformer of the capacitance of the resonant capacitance of inductance value, the LLC resonant converter, the LLC resonant converter
The secondary side turn ratio of original of the transformer of the inductance value of circle and the LLC resonant converter；
Computing unit, the intrinsic parameter information got for basis, the characterization LLC resonant converter are worked as
The working characteristics information of the parameter information of preceding loading condition and the pre-stored LLC resonant converter determines so that institute
State the lowest operating frequency value that LLC resonant converter is operated in the regions ZVS；
Execution unit is used for if it is determined that the value range of the working frequency of the LLC resonant converter of current setting
Minimum value is less than the lowest operating frequency value, then adjusts the minimum value of the value range of the working frequency and it is made to be not less than institute
State lowest operating frequency value；Wherein, the working frequency of the LLC resonant converter is to drive opening for the LLC resonant converter
Close the frequency of the drive signal of pipe.
Optionally, the parameter information of the characterization LLC resonant converter current load situation includes：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
Optionally, the LLC resonant converter include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or
Any one in asymmetrical half-bridge LLC resonant converter.
Correspondingly, the embodiment of the present invention additionally provides a kind of entity apparatus improving LLC resonant converter reliability, packet
It includes：
Memory, the intrinsic parameter information for storing program instruction and LLC resonant converter；Wherein, described intrinsic
Parameter information includes the resonant capacitance of the inductance value of the resonant inductance of the LLC resonant converter, the LLC resonant converter
The transformation of the inductance value of the primary coil of the transformer of capacitance, the LLC resonant converter and the LLC resonant converter
The secondary side turn ratio of original of device；
Sample circuit, for acquiring the parameter information for characterizing the LLC resonant converter current load situation；
Processor is executed for calling the program instruction stored in the memory according to the program instruction of acquisition：It obtains
The ginseng of the intrinsic parameter information of the LLC resonant converter and the characterization LLC resonant converter current load situation
Number information；According to the ginseng of the intrinsic parameter information, the characterization LLC resonant converter current load situation that get
The working characteristics information of number information and the pre-stored LLC resonant converter determines so that the LLC resonant converter
It is operated in the lowest operating frequency value in the regions ZVS；If it is determined that the working frequency of the LLC resonant converter of current setting takes
The minimum value for being worth range is less than the lowest operating frequency value, then adjusting the minimum value of the value range of the working frequency makes it
Not less than the lowest operating frequency value；Wherein, the working frequency of the LLC resonant converter is that the LLC resonance is driven to become
The frequency of the drive signal of the switching tube of parallel operation.
Optionally, the sample circuit, be specifically used for acquiring the voltage value of the output voltage of the LLC resonant converter with
And the current value of output current；And/or acquire the voltage value and input current of the input voltage of the LLC resonant converter
Current value.
Optionally, the LLC resonant converter include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or
Any one in asymmetrical half-bridge LLC resonant converter.
The present invention has the beneficial effect that：
An embodiment of the present invention provides a kind of methods and relevant apparatus improving LLC resonant converter reliability, can obtain
The intrinsic parameter information of LLC resonant converter and the parameter information of the characterization LLC resonant converter current load situation；Its
In, the intrinsic parameter information includes the inductance value of the resonant inductance of the LLC resonant converter, the LLC resonant converter
The capacitance of resonant capacitance, the LLC resonant converter transformer primary coil inductance value and the LLC resonance
The secondary side turn ratio of original of the transformer of converter；And it is humorous according to the intrinsic parameter information, the characterization LLC got
It shakes the parameter information of converter current load situation and the working characteristics information of the pre-stored LLC resonant converter,
It determines so that the LLC resonant converter is operated in the lowest operating frequency value in the regions ZVS；And, however, it is determined that current setting
The minimum value of the value range of the working frequency of the LLC resonant converter is less than the lowest operating frequency value, then adjusts institute
Stating the minimum value of the value range of working frequency makes it be not less than the lowest operating frequency value；Wherein, the LLC resonant transformations
The working frequency of device is the frequency of the drive signal for the switching tube for driving the LLC resonant converter.That is, can basis
The loading condition of LLC resonant converter adjusts the minimum value of the working frequency of LLC resonant converter, to ensure LLC resonance in real time
Converter always works in ZVS patterns；Therefore, it can not only effectively improve using silicon substrate MOSFET body diodes as primary side switch
Reliability of the LLC resonant converter of device in booting, load jump and input saltus step；Moreover, without to LLC resonant transformations
Device carries out hardware modifications, and improving cost is relatively low.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 show the working characteristics schematic diagram of LLC resonant converter；
Fig. 2 show the step flow chart of the method for the raising LLC resonant converter reliability in the embodiment of the present invention one；
Fig. 3 show the topology diagram of the full-bridge LLC resonant converter in the embodiment of the present invention one；
Fig. 4 show the topology diagram of the symmetrical half bridge LLC resonant converter in the embodiment of the present invention one；
Fig. 5 show the topology diagram of the asymmetrical half-bridge LLC resonant converter in the embodiment of the present invention one；
Fig. 6 show the structural schematic diagram of the device of the raising LLC resonant converter reliability in the embodiment of the present invention two；
The structure of the entity apparatus for the raising LLC resonant converter reliability that Fig. 7 is shown in the embodiment of the present invention two is shown
It is intended to.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, shall fall within the protection scope of the present invention.
Embodiment one：
The embodiment of the present invention one provides a kind of method improving LLC resonant converter reliability, specifically, such as Fig. 2 institutes
Show, be the step flow chart of method described in the embodiment of the present invention one, the method may include following steps：
Step 201：Intrinsic parameter information and the characterization LLC resonant converter for obtaining LLC resonant converter are current
The parameter information of loading condition；Wherein, the intrinsic parameter information includes the inductance of the resonant inductance of the LLC resonant converter
The primary coil of the transformer of value, the capacitance of resonant capacitance of the LLC resonant converter, the LLC resonant converter
The secondary side turn ratio of original of the transformer of inductance value and the LLC resonant converter.
Optionally, the LLC resonant converter may include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter
Or any one in asymmetrical half-bridge LLC resonant converter.
The topological structure of full-bridge LLC resonant converter is as shown in figure 3, include：One full-bridge circuit is coupled to input electricity
Pressure, and include four switching devices A, B, C, D；One inductance Lr one capacitance Cr of series connection, are coupled to the bridge circuit, are switched by those
Device drive；One transformer T1, is coupled to the resonant network；One rectification circuit is coupled to transformer T1；One LC filters,
It is coupled to the rectification circuit and transformer T1.
The topological structure of symmetrical half bridge LLC resonant converter is as shown in figure 4, include：One half-bridge circuit is coupled to an input
Voltage, and include two switching devices A, B；Two capacitance Cr1, Cr2 series connection, are coupled to an input voltage；One inductance Lr is coupled to
The bridge circuit is driven by those switching devices；One transformer T1, is coupled to the resonant network；One rectification circuit, is coupled to this
Transformer T1；One LC filters are coupled to the rectification circuit and transformer T1.
The topological structure of asymmetrical half-bridge LLC resonant converter is as shown in figure 5, include：One half-bridge circuit, it is defeated to be coupled to one
Enter voltage, and includes two switching devices A, B；One inductance Lr one capacitance Cr of series connection, are coupled to the bridge circuit, are switched by those
Device drive；One transformer T1, is coupled to the resonant network；One rectification circuit is coupled to transformer T1；One LC filters,
It is coupled to the rectification circuit and transformer T1.
The method provided in an embodiment of the present invention is applicable to the LLC resonant converter of above-mentioned three kinds of topological structures, example
Such as, by taking asymmetrical half-bridge LLC resonant converter as an example, the intrinsic parameter of the asymmetrical half-bridge LLC resonant converter got is believed
Breath may include：The inductance value of resonant inductance Lr, the capacitance of resonant capacitance Cr, transformer T1 primary coil inductance value and
The secondary side turn ratio of original of transformer T1.
In addition, it is necessary to explanation, due to being directed to any LLC resonant converter, intrinsic parameter information is to immobilize
, it will not be changed according to the variation of load；It therefore, can be advance by its intrinsic parameter information for any LLC resonant converter
Be stored in FLASH flash memories or EEPROM (Electrically Erasable Programmable Read-Only Memory,
Band Electrically Erasable Programmable Read-Only Memory) in, it is obtained at any time when for executing the method.
Optionally, the parameter information of the characterization LLC resonant converter current load situation may include：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
Since the voltage value of output voltage can be equal to the transformer of the voltage value and the LLC resonant converter of input voltage
The ratio between the secondary side turn ratio of original, the current value of output current is equal to the current value of input current and the LLC resonant converter
The product of the secondary side turn ratio of original of transformer；Therefore, one of output voltage and input voltage or whole, and output can be acquired
One of electric current and input current or all parameter information as the characterization LLC resonant converter current load situation,
The present embodiment is not limited in any way herein.
Optionally, the parameter that sample circuit acquisition characterizes the LLC resonant converter current load situation specifically can be used
Information utilizes electric current for example, acquiring the voltage value of the output voltage of the LLC resonant converter using voltage sampling circuit
Sample circuit acquires the current value of the output current of the LLC resonant converter, and details are not described herein for the present embodiment.
Step 202：It is currently born according to the intrinsic parameter information that gets, the characterization LLC resonant converter
The parameter information of situation and the working characteristics information of the pre-stored LLC resonant converter are carried, is determined so that the LLC
Controlled resonant converter is operated in the lowest operating frequency value in the regions ZVS.
For example, by taking asymmetrical half-bridge LLC resonant converter as an example, according to its working characteristics it is found that asymmetrical half-bridge LLC is humorous
The transfer equation of converter of shaking is：
Wherein, | M | it is the absolute value of voltage conversion ratio； Wherein, fs is the working frequency of the LLC resonant converter, and Lr is institute
The inductance value of the resonant inductance of LLC resonant converter is stated, Cr is the capacitance of the resonant capacitance of the LLC resonant converter, Lp
For the inductance value of the primary coil of the transformer of the LLC resonant converter, a is the transformer of the LLC resonant converter
Former pair side turn ratio, VoFor the voltage value of output voltage, IoFor the current value of output current.
By Fig. 1 (the working characteristics schematic diagram of LLC resonant converter) it is found that being directed to any bar gain curve, inflection point is
The critical point in the regions ZCS and the regions ZVS is operated in for LLC resonant converter, when the value (working frequency of LLC resonant converter of x
The ratio of fs and the resonant frequency fr of LLC resonant converter) when being less than the abscissa at inflection point, LLC resonant converter is by work
In the regions ZCS；Therefore, only need to the transfer equation derivation of asymmetrical half-bridge LLC resonant converter, then by Lr, Cr of acquisition,
Lp、a、VoAnd IoIt brings derivative equation into, determines the value so that the fs that derivative is 0, that is, determine so that asymmetrical half-bridge LLC resonance
Converter is operated in the lowest operating frequency value in the regions ZVS.
It should be noted that since load equivalent resistance R can also pass through the voltage value of input voltage, the electric current of input current
The secondary side turn ratio of original of the transformer of value and LLC resonant converter is calculated, therefore, when acquisition LLC resonant converter
The voltage value of input voltage and the current value of input current are as the ginseng for characterizing the LLC resonant converter current load situation
When number information, LLC resonant converter is operated in the determination method class of the lowest operating frequency value in the regions ZVS seemingly, and the present embodiment exists
This is repeated no more.
It still needs to it is noted that since the working characteristics of the LLC resonant converter of different topology structure is similar, is only conversion
The expression formula of equation is not exactly the same, therefore, for the LLC resonant converter of other topological structures, is operated in the regions ZVS
The determination method of lowest operating frequency value is also similar, and details are not described herein for the present embodiment.
Step 203：If it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting
Less than the lowest operating frequency value, then adjusting the minimum value of the value range of the working frequency makes it not less than described minimum
Operating frequency value；Wherein, the working frequency of the LLC resonant converter is to drive the switching tube of the LLC resonant converter
The frequency of drive signal.
Optionally, can be that an initial operating frequency is arranged in the LLC resonant converter in advance according to actual use situation
Value range adjusts the work in real time or in the driving circuit hair wavefront of each LLC resonant converter further according to loading condition
The minimum value of frequency value range.
Preferably, however, it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting
Less than the lowest operating frequency value, then the minimum value that can adjust the value range of the working frequency is equal to the minimum work
Frequency values.
Optionally, however, it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting
Not less than the lowest operating frequency value, then the minimum value of the value range of the working frequency can be kept constant.
Correspondingly, the embodiment of the present invention additionally provides a kind of computer readable storage medium, the computer-readable storage
Media storage has a computer executable instructions, and it is any of the above-described described that the computer executable instructions are used to make computer to execute
The method for improving LLC resonant converter reliability.
In conclusion the method provided in an embodiment of the present invention for improving LLC resonant converter reliability, it is humorous can to obtain LLC
Shake the intrinsic parameter information of converter and the parameter information of the characterization LLC resonant converter current load situation；Wherein, institute
State the inductance value for the resonant inductance that intrinsic parameter information includes the LLC resonant converter, the resonance of the LLC resonant converter
The inductance value of the primary coil of the transformer of the capacitance of capacitance, the LLC resonant converter and the LLC resonant converter
Transformer the secondary side turn ratio of original；And according to get the intrinsic parameter information, the characterization LLC resonant transformations
The working characteristics information of the parameter information of device current load situation and the pre-stored LLC resonant converter, determination make
Obtain the lowest operating frequency value that the LLC resonant converter is operated in the regions ZVS；And, however, it is determined that the LLC of current setting
The minimum value of the value range of the working frequency of controlled resonant converter is less than the lowest operating frequency value, then adjusts the work frequency
The minimum value of the value range of rate makes it be not less than the lowest operating frequency value；Wherein, the work of the LLC resonant converter
Frequency is the frequency of the drive signal for the switching tube for driving the LLC resonant converter.That is, can be become according to LLC resonance
The loading condition of parallel operation adjusts the minimum value of the working frequency of LLC resonant converter in real time, to ensure that LLC resonant converter begins
It is operated in ZVS patterns eventually；Therefore, it can not only effectively improve using silicon substrate MOSFET body diodes as primary side switch device
Reliability of the LLC resonant converter in booting, load jump and input saltus step；Moreover, without being carried out to LLC resonant converter
Hardware modifications, improving cost are relatively low.
Embodiment two：
Based on same inventive concept, second embodiment of the present invention provides a kind of raising LLC resonant converter reliabilities
Device, specifically, as shown in fig. 6, its structural schematic diagram for device described in the embodiment of the present invention two, described device can wrap
It includes：
Acquiring unit 601, intrinsic parameter information and the characterization LLC resonance for obtaining LLC resonant converter become
The parameter information of parallel operation current load situation；Wherein, the intrinsic parameter information includes the resonance electricity of the LLC resonant converter
The original of the transformer of the capacitance of the resonant capacitance of the inductance value of sense, the LLC resonant converter, the LLC resonant converter
The inductance value of sideline circle and the secondary side turn ratio of the original of the transformer of the LLC resonant converter；
Computing unit 602, the intrinsic parameter information got for basis, the characterization LLC resonant transformations
The working characteristics information of the parameter information of device current load situation and the pre-stored LLC resonant converter, determination make
Obtain the lowest operating frequency value that the LLC resonant converter is operated in the regions ZVS；
Execution unit 603 is used for the value range if it is determined that the working frequency of the LLC resonant converter of current setting
Minimum value be less than the lowest operating frequency value, then adjusting the minimum value of the value range of the working frequency makes it be not less than
The lowest operating frequency value；Wherein, the working frequency of the LLC resonant converter is the driving LLC resonant converter
The frequency of the drive signal of switching tube.
Optionally, the parameter information of the characterization LLC resonant converter current load situation may include：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
Optionally, the LLC resonant converter may include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter
Or any one in asymmetrical half-bridge LLC resonant converter.
The embodiment of the present invention two additionally provides a kind of entity apparatus improving LLC resonant converter reliability, specifically, such as
It is the structural schematic diagram of entity apparatus described in the embodiment of the present invention two shown in Fig. 7, the entity apparatus may include：
Memory 701, the intrinsic parameter information for storing program instruction and LLC resonant converter；Wherein, described solid
It includes the resonant capacitance of the inductance value of the resonant inductance of the LLC resonant converter, the LLC resonant converter to have parameter information
Capacitance, the LLC resonant converter transformer primary coil inductance value and the LLC resonant converter change
The secondary side turn ratio of original of depressor；
Sample circuit 702, for acquiring the parameter information for characterizing the LLC resonant converter current load situation；
Processor 703 is held for calling the program instruction stored in the memory 701 according to the program instruction of acquisition
Row：Obtain the intrinsic parameter information of the LLC resonant converter and the characterization LLC resonant converter present load feelings
The parameter information of condition；According to get the intrinsic parameter information, the characterization LLC resonant converter present load feelings
The working characteristics information of the parameter information of condition and the pre-stored LLC resonant converter determines so that the LLC resonance
Converter is operated in the lowest operating frequency value in the regions ZVS；If it is determined that the work frequency of the LLC resonant converter of current setting
The minimum value of the value range of rate is less than the lowest operating frequency value, then adjusts the minimum of the value range of the working frequency
Value makes it be not less than the lowest operating frequency value；Wherein, the working frequency of the LLC resonant converter is to drive the LLC
The frequency of the drive signal of the switching tube of controlled resonant converter.
It should be noted that due to being directed to any LLC resonant converter, intrinsic parameter information be it is changeless, no
It can be changed according to the variation of load；Therefore, for any LLC resonant converter, its intrinsic parameter information can be prestored
In memory 701, device 703 for processing obtains at any time when executing described program instruction.
Optionally, the sample circuit 702 can be specifically used for acquiring the electricity of the output voltage of the LLC resonant converter
The current value of pressure value and output current；And/or acquire the voltage value of the input voltage of the LLC resonant converter and defeated
Enter the current value of electric current.
Optionally, the sample circuit 702, concretely voltage sampling circuit and current sampling circuit, for example, can profit
The voltage value that the output voltage of the LLC resonant converter is acquired with voltage sampling circuit acquires institute using current sampling circuit
The current value of the output current of LLC resonant converter is stated, details are not described herein for the present embodiment.
Optionally, the LLC resonant converter may include full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter
Or any one in asymmetrical half-bridge LLC resonant converter.
In conclusion the relevant apparatus provided in an embodiment of the present invention for improving LLC resonant converter reliability, can obtain
The intrinsic parameter information of LLC resonant converter and the parameter information of the characterization LLC resonant converter current load situation；Its
In, the intrinsic parameter information includes the inductance value of the resonant inductance of the LLC resonant converter, the LLC resonant converter
The capacitance of resonant capacitance, the LLC resonant converter transformer primary coil inductance value and the LLC resonance
The secondary side turn ratio of original of the transformer of converter；And it is humorous according to the intrinsic parameter information, the characterization LLC got
It shakes the parameter information of converter current load situation and the working characteristics information of the pre-stored LLC resonant converter,
It determines so that the LLC resonant converter is operated in the lowest operating frequency value in the regions ZVS；And, however, it is determined that current setting
The minimum value of the value range of the working frequency of the LLC resonant converter is less than the lowest operating frequency value, then adjusts institute
Stating the minimum value of the value range of working frequency makes it be not less than the lowest operating frequency value；Wherein, the LLC resonant transformations
The working frequency of device is the frequency of the drive signal for the switching tube for driving the LLC resonant converter.That is, can basis
The loading condition of LLC resonant converter adjusts the minimum value of the working frequency of LLC resonant converter, to ensure LLC resonance in real time
Converter always works in ZVS patterns；Therefore, it can not only effectively improve using silicon substrate MOSFET body diodes as primary side switch
Reliability of the LLC resonant converter of device in booting, load jump and input saltus step；Moreover, without to LLC resonant transformations
Device carries out hardware modifications, and improving cost is relatively low.
It should be noted that any number of elements in drawing and description is used to example and unrestricted and any
Name is only used for distinguishing, without any restrictions meaning.
It will be understood by those skilled in the art that the embodiment of the present invention can be provided as method, apparatus (equipment) or computer journey
Sequence product.Therefore, complete hardware embodiment, complete software embodiment or combining software and hardware aspects can be used in the present invention
The form of embodiment.Moreover, the present invention can be used in one or more wherein include computer usable program code calculating
The computer program implemented in machine usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow chart of device (equipment) and computer program product
And/or block diagram describes.It should be understood that each flow in flowchart and/or the block diagram can be realized by computer program instructions
And/or the combination of the flow and/or box in box and flowchart and/or the block diagram.These computer programs can be provided to refer to
Enable the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate
One machine so that by the instruction that computer or the processor of other programmable data processing devices execute generate for realizing
The device for the function of being specified in one flow of flow chart or multiple flows and/or one box of block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of method improving LLC resonant converter reliability, which is characterized in that the method includes：
Obtain the intrinsic parameter information of LLC resonant converter and the ginseng of the characterization LLC resonant converter current load situation
Number information；Wherein, the intrinsic parameter information includes the inductance value of the resonant inductance of the LLC resonant converter, the LLC humorous
Shake the capacitance of resonant capacitance of converter, the transformer of the LLC resonant converter primary coil inductance value and institute
State the secondary side turn ratio of original of the transformer of LLC resonant converter；
According to the parameter of the intrinsic parameter information, the characterization LLC resonant converter current load situation that get
The working characteristics information of information and the pre-stored LLC resonant converter determines so that the LLC resonant converter work
Make the lowest operating frequency value in the regions ZVS；
If it is determined that the minimum value of the value range of the working frequency of the LLC resonant converter of current setting is less than described minimum
Operating frequency value, then adjusting the minimum value of the value range of the working frequency makes it be not less than the lowest operating frequency value；
Wherein, the working frequency of the LLC resonant converter is the frequency of the drive signal for the switching tube for driving the LLC resonant converter
Rate.
2. the method for improving LLC resonant converter reliability as described in claim 1, which is characterized in that described in the characterization
The parameter information of LLC resonant converter current load situation includes：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
3. the method for improving LLC resonant converter reliability as described in claim 1, which is characterized in that the LLC resonance becomes
Parallel operation includes in full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or asymmetrical half-bridge LLC resonant converter
Any one.
4. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer can
It executes instruction, the computer executable instructions are for making computer perform claim that 1~3 any one of them be required to improve LLC
The method of controlled resonant converter reliability.
5. a kind of device improving LLC resonant converter reliability, which is characterized in that described device includes：
Acquiring unit, the intrinsic parameter information and the characterization LLC resonant converter for obtaining LLC resonant converter are current
The parameter information of loading condition；Wherein, the intrinsic parameter information includes the inductance of the resonant inductance of the LLC resonant converter
The primary coil of the transformer of value, the capacitance of resonant capacitance of the LLC resonant converter, the LLC resonant converter
The secondary side turn ratio of original of the transformer of inductance value and the LLC resonant converter；
Computing unit, the intrinsic parameter information got for basis, the characterization LLC resonant converter are currently born
The parameter information of situation and the working characteristics information of the pre-stored LLC resonant converter are carried, is determined so that the LLC
Controlled resonant converter is operated in the lowest operating frequency value in the regions ZVS；
Execution unit is used for the minimum if it is determined that the value range of the working frequency of the LLC resonant converter of current setting
Value is less than the lowest operating frequency value, then adjust the value range of the working frequency minimum value make its not less than it is described most
Low operating frequency value；Wherein, the working frequency of the LLC resonant converter is to drive the switching tube of the LLC resonant converter
Drive signal frequency.
6. improving the device of LLC resonant converter reliability as claimed in claim 5, which is characterized in that described in the characterization
The parameter information of LLC resonant converter current load situation includes：
The voltage value of the output voltage of the LLC resonant converter and the current value of output current；And/or
The voltage value of the input voltage of the LLC resonant converter and the current value of input current.
7. improving the device of LLC resonant converter reliability as claimed in claim 5, which is characterized in that the LLC resonance becomes
Parallel operation includes in full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or asymmetrical half-bridge LLC resonant converter
Any one.
8. a kind of device improving LLC resonant converter reliability, which is characterized in that described device includes：
Memory, the intrinsic parameter information for storing program instruction and LLC resonant converter；Wherein, the intrinsic parameter
Information includes the capacitance of the resonant capacitance of the inductance value of the resonant inductance of the LLC resonant converter, the LLC resonant converter
The inductance value of the primary coil of the transformer of value, the LLC resonant converter and the transformer of the LLC resonant converter
Former pair side turn ratio；
Sample circuit, for acquiring the parameter information for characterizing the LLC resonant converter current load situation；
Processor is executed for calling the program instruction stored in the memory according to the program instruction of acquisition：Described in acquisition
The parameter letter of the intrinsic parameter information of LLC resonant converter and the characterization LLC resonant converter current load situation
Breath；According to the parameter letter of the intrinsic parameter information, the characterization LLC resonant converter current load situation that get
The working characteristics information of breath and the pre-stored LLC resonant converter determines so that LLC resonant converter work
Lowest operating frequency value in the regions ZVS；If it is determined that the value model of the working frequency of the LLC resonant converter of current setting
The minimum value enclosed is less than the lowest operating frequency value, then adjusting the minimum value of the value range of the working frequency keeps it not low
In the lowest operating frequency value；Wherein, the working frequency of the LLC resonant converter is to drive the LLC resonant converter
Switching tube drive signal frequency.
9. improving the device of LLC resonant converter reliability as claimed in claim 8, which is characterized in that the sample circuit,
The current value of voltage value and output current specifically for the output voltage of the acquisition LLC resonant converter；And/or it adopts
Collect the voltage value of the input voltage of the LLC resonant converter and the current value of input current.
10. improving the device of LLC resonant converter reliability as claimed in claim 8, which is characterized in that the LLC resonance
Converter includes in full-bridge LLC resonant converter, symmetrical half bridge LLC resonant converter or asymmetrical half-bridge LLC resonant converter
Any one.
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| CN201710207415.XA CN108667299B (en) | 2017-03-31 | 2017-03-31 | Method for improving reliability of LLC resonant converter and related device |
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| CN201710207415.XA CN108667299B (en) | 2017-03-31 | 2017-03-31 | Method for improving reliability of LLC resonant converter and related device |
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| CN110212767A (en) * | 2019-04-30 | 2019-09-06 | 东南大学 | Realize the digital control method of LLC resonant converter multistep frequency modulation |
| CN110957916A (en) * | 2019-01-15 | 2020-04-03 | 郑州嘉晨电器有限公司 | Digital synchronous rectification method of half-bridge LLC converter |
| CN111509981A (en) * | 2019-12-30 | 2020-08-07 | 中国船舶重工集团公司第七0九研究所 | Frequency self-adaptive control method and system of LL C resonant converter |
| WO2021254535A3 (en) * | 2021-03-18 | 2022-02-10 | 深圳市正浩创新科技股份有限公司 | Resonant converter and variable limit frequency control method therefor |
| CN114421781A (en) * | 2022-03-31 | 2022-04-29 | 深圳市芯茂微电子有限公司 | Control method of resonant converter |
| CN117639518A (en) * | 2024-01-26 | 2024-03-01 | 西安图为电气技术有限公司 | Bidirectional LLC resonant converter control method and device |
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| CN117639518B (en) * | 2024-01-26 | 2024-04-23 | 西安图为电气技术有限公司 | Bidirectional LLC resonant converter control method and device |
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Effective date of registration: 20201013 Address after: Ohio, USA Patentee after: Dimension Corp. Address before: 1510 Kansas Avenue, Loren, Ohio, USA Patentee before: Emerson Energy Systems, AB |