CN108933524A - Vehicle-mounted power supply drive control method and device, microcontroller and automobile - Google Patents
Vehicle-mounted power supply drive control method and device, microcontroller and automobile Download PDFInfo
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- CN108933524A CN108933524A CN201811009330.1A CN201811009330A CN108933524A CN 108933524 A CN108933524 A CN 108933524A CN 201811009330 A CN201811009330 A CN 201811009330A CN 108933524 A CN108933524 A CN 108933524A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005669 field effect Effects 0.000 claims abstract description 110
- 230000008859 change Effects 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 25
- 230000003247 decreasing effect Effects 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 15
- 230000002596 correlated effect Effects 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000010363 phase shift Effects 0.000 description 17
- 206010037660 Pyrexia Diseases 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000009466 transformation Effects 0.000 description 3
- 230000018199 S phase Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- 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
-
- 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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/1566—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a vehicle-mounted power supply drive control method, a vehicle-mounted power supply drive control device, a microcontroller and an automobile, wherein the vehicle-mounted power supply drive control method comprises the following steps: acquiring load current of a vehicle-mounted power supply; monitoring the change condition of the load current; and when the load current reaches a first preset value, controlling the duty ratio output by the microcontroller to the driving transformer to change according to the change condition, and controlling the working frequency of a field effect tube of the vehicle-mounted power supply to change. According to the embodiment of the invention, according to the change condition of the load current, when the load of the vehicle-mounted power supply is light or even no-load, the duty ratio output to the driving transformer and the working frequency of the field effect tube of the vehicle-mounted power supply are controlled, so that the field effect tube works in a phase-shifting or phase-shifting interrupted mode, enough current is provided to better realize the soft switching of the half-bridge MOSFET, and more stable voltage can be output, and the condition that the field effect tube is obviously heated and the working reliability is influenced due to light load or no-load of the vehicle-mounted power supply is avoided.
Description
Technical field
The present invention relates to the vehicle-mounted power supply control field of electric car more particularly to a kind of vehicle power supply drive control method,
Device, microcontroller and automobile.
Background technique
With the development of vehicle power supply.The efficient power solution of high power density has been widely used for pure electric vehicle
In automobile and hybrid vehicle.And in the selection of numerous topological structures, LLC circuit structure is in efficiency, electromagnetic interference, stabilization
Property aspect all its unique advantage.But also there is its disadvantage, be the most significantly exactly the control under the conditions of unloaded and underloading.With vehicle-mounted
Charger is column, under common half-bridge, full-bridge LLC resonant operational mode, is full of, ties fastly when the high-tension battery packet on automobile charges
Shu Shi, charging current will be reduced to very little or be zero.The working frequency of onboard charger is higher than resonance frequency at this time, reaches maximum
Upper operational frequency limit, LLC resonance current is close or equal to exciting current at this time, and the MOSFET of primary side full-bridge or half-bridge is possible to not
It can thoroughly realize Sofe Switch, fever can be more obvious；And high working frequency will lead to high switching loss.Therefore it needs
A kind of method make underloading or it is unloaded when, LLC resonant network still works in more reliable state.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of vehicle power supply drive control method, apparatus, microcontroller
Device and automobile, when solving vehicle power supply underloading or zero load, the insecure problem of LLC resonant network work.
According to one aspect of the present invention, a kind of vehicle power supply drive control method is provided, comprising:
Obtain the load current of vehicle power supply；
Monitor the situation of change of the load current；
When the load current reaches the first preset value, microcontroller is controlled to driving transformation according to the situation of change
The change in duty cycle of device output, and control the working frequency variation of the field-effect tube of the vehicle power supply.
Optionally, when the load current reaches the first preset value, according to the situation of change control microcontroller to
The change in duty cycle of driving transformer output, and the step of working frequency for controlling the field-effect tube of the vehicle power supply changes packet
It includes:
When the load current reaches the first preset value, controlling microcontroller to the duty ratio that driving transformer exports is
First ratio；
When the load current is changed by first preset value, according to the duty ratio and the load current
Be positively correlated, the functional relation of the working frequency of the field-effect tube and the load current negative correlation, adjust the duty ratio with
The working frequency of the field-effect tube.
Optionally, the step of working frequency for adjusting the duty ratio and the field-effect tube includes:
When the load current is decreased to zero load by first preset value, controls the duty ratio and compared by described first
Value is decreased to the second ratio, and controls the field-effect tube and be increased to the highest that the field-effect tube allows by present operating frequency
Working frequency.
Optionally, the second ratio, and the work of the field-effect tube are decreased to by first ratio in the duty ratio
Frequency is increased to after maximum operating frequency, the method also includes:
The driving voltage value that monitoring driving transformer is exported to the field-effect tube；
In driving voltage value ring maximum value stagnant greater than predeterminated voltage, controls the vehicle power supply and stop working；
After the vehicle power supply stops working, monitor that the driving voltage value is less than the stagnant ring minimum value of predeterminated voltage
When, it controls the vehicle power supply and starts to work.
According to another aspect of the invention, a kind of vehicle power supply drive dynamic control device is provided, comprising:
First obtains module, for obtaining the load current of vehicle power supply；
First monitoring modular, for monitoring the situation of change of the load current；
First control module, for being controlled according to the situation of change when the load current reaches the first preset value
The change in duty cycle that microcontroller is exported to driving transformer, and the working frequency for controlling the field-effect tube of the vehicle power supply becomes
Change.
Optionally, first control module includes:
First control unit, for when the load current reaches the first preset value, control microcontroller to become to driving
The duty ratio of depressor output is the first ratio；
Second control unit, for being accounted for according to described when the load current is changed by first preset value
Than being positively correlated with the load current, the function of the working frequency of the field-effect tube and the load current negative correlation closes sky
System, adjusts the working frequency of the duty ratio and the field-effect tube.
Optionally, second control unit is specifically used for:
When the load current is decreased to zero load by first preset value, controls the duty ratio and compared by described first
Value is decreased to the second ratio, and controls the field-effect tube and be increased to the highest that the field-effect tube allows by present operating frequency
Working frequency.
Optionally, the vehicle power supply drive dynamic control device further include:
Second monitoring modular, the driving voltage value exported for monitoring driving transformer to the field-effect tube；
Second control module, for controlling the vehicle in driving voltage value ring maximum value stagnant greater than predeterminated voltage
Power supply is carried to stop working；
Third control module, for after the vehicle power supply stops working, monitoring that it is pre- that the driving voltage value is less than
If when voltage hysteresis minimum value, controlling the vehicle power supply and starting to work.
According to another aspect of the invention, it provides a kind of microcontroller, including processor, memory and is stored in institute
The computer program that can be run on memory and on the processor is stated, when the computer program is executed by the processor
The step of realizing above-mentioned vehicle power supply drive control method.
Another aspect according to the present invention provides a kind of automobile, including above-mentioned vehicle power supply drive dynamic control device.
The beneficial effect of the embodiment of the present invention is:
In above scheme, passed through according to the situation of change of load current when the light load of vehicle power supply is even unloaded
The working frequency for controlling the field-effect tube of the duty ratio and vehicle power supply that export to driving transformer is moving field-effect tube work
Mutually or under the interrupted mode of phase shift, there are enough electric currents preferably to realize the Sofe Switch of half-bridge MOSFET, and can export more
Stable voltage avoids because vehicle power supply underloading or zero load cause field-effect tube fever obvious, influences the feelings of functional reliability
Condition.
Detailed description of the invention
Fig. 1 shows one of the flow charts of the vehicle power supply drive control method of the embodiment of the present invention；
Fig. 2 indicates the circuit diagram of the vehicle power supply driving circuit of the embodiment of the present invention；
Fig. 3 indicates the two of the flow chart of the vehicle power supply drive control method of the embodiment of the present invention；
Fig. 4 indicates one of the structural block diagram of the vehicle power supply drive dynamic control device of the embodiment of the present invention；
Fig. 5 indicates the two of the structural block diagram of the vehicle power supply drive dynamic control device of the embodiment of the present invention.
Specific embodiment
The exemplary embodiment that the present invention will be described in more detail below with reference to accompanying drawings.Although showing the present invention in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the present invention without should be by embodiments set forth here
It is limited.It is to be able to thoroughly understand the present invention on the contrary, providing these embodiments, and can be by the scope of the present invention
It is fully disclosed to those skilled in the art.
As shown in Figure 1, the embodiment provides a kind of vehicle power supply drive control methods, comprising:
Step 11, the load current for obtaining vehicle power supply；
The situation of change of step 12, the monitoring load current；
In the embodiment, microcontroller is connect with driving transformer, the driving electricity of the driving transformer and vehicle power supply
The field-effect tube on road connects, and the microcontroller exports certain duty ratio to the driving transformer, and through transformation of overdriving
Device provides driving voltage to field-effect tube.The load current of the microcontroller real-time monitoring vehicle power supply, and judge load electricity
The situation of change of stream.
Step 13, when the load current reaches the first preset value, according to the situation of change control microcontroller to
The change in duty cycle of driving transformer output, and control the working frequency variation of the field-effect tube of the vehicle power supply.
In the embodiment, the microcontroller is also connect with the field-effect tube, for controlling the work of the field-effect tube
Working frequency variation.Wherein, the partial circuit diagram of vehicle power supply driving circuit is as shown in Fig. 2, voltage input end connects two field effects
Should pipe Q1 and Q2, the Q1 connects LLC resonance circuit with the connecting line of Q2.In the microcontrollers monitor to the load current
When reaching the first preset value or being less than first preset value, it is believed that vehicle power supply underloading, first preset value is according to need
Ask setting, it is preferable that first preset value is 20%, i.e., thinks vehicle when load current is less than or equal to the 20% of rated current
Load power supply is light condition.Field-effect pipe works in higher frequency under light condition in order to prevent at this time, and then it is humorous to influence LLC
The functional reliability of vibrating network, situation of change of the microcontroller according to the load current based on first preset value, control
The variation of the working frequency of the duty ratio and the field-effect tube that are exported to the driving transformer, to reach described in control
The effect of the operating mode of field-effect tube.
Specifically, the operating mode of the field-effect tube includes phase shift and phase shift discontinuous mode, in light load, makes two
Mode of a field-effect tube Q1 and Q2 work in upper frequency and phase shift, wherein phase shifting angle=1- duty ratio, the load current
It is to be positively correlated with duty ratio, the working frequency with the field-effect tube is negative correlation, i.e., it is pre- to be based on described first in load current
If value increases, control and be gradually increased to the duty ratio that the driving transformer exports, until increasing to 1, and controls the field
The working frequency of effect pipe is gradually reduced by present operating frequency；When load current is based on first preset value reduction, then
It controls to the duty ratio that the driving transformer exports and is gradually decrease to certain value, and control the working frequency of the field-effect tube
It is gradually risen by present operating frequency, until being increased to the maximum operating frequency allowed.If the duty ratio is decreased to certain value,
And after the working frequency of field-effect tube is increased to maximum operating frequency, the load current continues to be decreased to zero load, then controls institute
It states duty ratio no longer to reduce, maintains the definite value, and the working frequency for controlling the field-effect tube maintains highest work frequency
Rate.Above scheme is the operating mode of the phase shift of the field-effect tube.
After load current is decreased to zero load, by setting the driving voltage that exports to the field-effect tube of driving transformer
Voltage hysteresis, be maintained at the driving voltage of output in a certain range of cell voltage, if voltage is more than at this time to set
Stagnant ring maximum value, LLC resonant network stop working, at this time magnetic device and capacitive energy storage power supply, and voltage to be output is lower than setting
When stagnant ring minimum value, the restarting of LLC resonant network, alternate run, is discontinuously accounted in this way with driving to substitute very little repeatedly
Empty ratio continues working.Above scheme is the interrupted operating mode of the phase shift of the field-effect tube.
The program passes through control when the light load of vehicle power supply is even unloaded according to the situation of change of load current
The working frequency of the field-effect tube of the duty ratio and vehicle power supply that are exported to driving transformer, make field-effect tube work in phase shift or
Under the interrupted mode of person's phase shift, there are enough electric currents preferably to realize the Sofe Switch of half-bridge MOSFET, and can export more steady
Voltage, avoid the case where causing field-effect tube fever obvious because of vehicle power supply underloading or zero load, influence functional reliability.
Specifically, the step 13 includes:
When the load current reaches the first preset value, controlling microcontroller to the duty ratio that driving transformer exports is
First ratio；
In the embodiment, the load current reaches the first preset value and thinks that vehicle power supply is lightly loaded, and sets microcontroller at this time
The duty ratio that device is exported to driving transformer is the first ratio, and first ratio is set according to demand, can be according to practical reality
Debugging to be tested to obtain, it is preferable that first ratio is 0.8, at this point, field-effect tube work is in phase shift mode, phase shifting angle=
1- duty ratio.
When the load current is changed by first preset value, according to the duty ratio and the load current
Be positively correlated, the functional relation of the working frequency of the field-effect tube and the load current negative correlation, adjust the duty ratio with
The working frequency of the field-effect tube.
Specifically, the step of working frequency for adjusting the duty ratio and the field-effect tube includes:
When the load current is increased by first preset value, the institute that microcontroller is exported to driving transformer is controlled
It states duty ratio to be increased by first ratio, and controls the field-effect tube and declined by present operating frequency；
When the load current is reduced by first preset value, the institute that microcontroller is exported to driving transformer is controlled
It states duty ratio to be reduced by first ratio, and controls the field-effect tube and increased by present operating frequency；
Specifically, when the load current is decreased to zero load by first preset value, the duty ratio is controlled by institute
It states the first ratio and is decreased to the second ratio, and control the field-effect tube field-effect tube is increased to by present operating frequency and permit
Perhaps maximum operating frequency.
In the embodiment, the duty ratio and the load current are positively correlated, the working frequency of the field-effect tube and institute
Load current negative correlation is stated, second ratio is set according to demand, it is preferable that second ratio is 0.6, i.e., described negative
When load electric current is gradually reduced by first preset value, the duty ratio is controlled by 0.8 and is gradually decrease to 0.6, if the load
Electric current is persistently decreased to zero load, then the duty ratio maintains second ratio, and the working frequency dimension of the field-effect tube
It holds in the maximum operating frequency.
As shown in figure 3, being decreased to the second ratio, and the work of the field-effect tube by first ratio in the duty ratio
Working frequency is increased to after maximum operating frequency, the method also includes:
The driving voltage value that step 14, monitoring driving transformer are exported to the field-effect tube；
Step 15, when the driving voltage value is greater than the stagnant ring maximum value of predeterminated voltage, control the vehicle power supply and stop
Work；
In the embodiment, the second ratio is decreased to by first ratio in the duty ratio, and the field-effect tube
Working frequency is increased to after maximum operating frequency, the driving voltage exported by setting driving transformer to the field-effect tube
Voltage hysteresis, make output driving voltage be maintained in a certain range of cell voltage, if monitor voltage be more than at this time
The maximum value of the stagnant ring of the predeterminated voltage of setting then controls LLC resonant network and stops working, i.e., the described vehicle power supply stops working,
Magnetic device and capacitive energy storage are actively powered at this time.
Wherein, the purpose that the stagnant ring of the predeterminated voltage is arranged is that the voltage sensor of detection voltage is protected not to be damaged, excellent
Selection of land, the stagnant ring of predeterminated voltage can be ± the 5V of cell voltage.
Step 16, after the vehicle power supply stops working, monitor the driving voltage value be less than the stagnant ring of predeterminated voltage
When minimum value, controls the vehicle power supply and start to work.
In the embodiment, after the vehicle power supply stops working, magnetic device and capacitive energy storage replace vehicle power supply master
The voltage value of dynamic power supply, the vehicle power supply output is gradually reduced, and is monitoring driving voltage value less than the stagnant ring of predeterminated voltage most
When small value, control LLC resonant network restarting, the vehicle power supply is started to work, repeatedly alternate run, in this way with drive
Dynamic circuit breaker continues to substitute very little duty ratio and continue working, and in the case where interrupter duty, has enough electric currents preferably to realize half-bridge
The Sofe Switch of MOSFET, and more stable voltage can be exported, it avoids because vehicle power supply underloading or zero load lead to field-effect tube
The case where fever is obvious, influences functional reliability.
As shown in figure 4, the embodiment provides a kind of vehicle power supply drive dynamic control devices, comprising:
First obtains module 41, for obtaining the load current of vehicle power supply；
First monitoring modular 42, for monitoring the situation of change of the load current；
In the embodiment, microcontroller is connect with driving transformer, the driving electricity of the driving transformer and vehicle power supply
The field-effect tube on road connects, and the microcontroller exports certain duty ratio to the driving transformer, and through transformation of overdriving
Device provides driving voltage to field-effect tube.The load current of the microcontroller real-time monitoring vehicle power supply, and judge load electricity
The situation of change of stream.
First control module 43, for when the load current reaches the first preset value, according to the situation of change control
The change in duty cycle that microcontroller processed is exported to driving transformer, and control the working frequency of the field-effect tube of the vehicle power supply
Variation.
In the embodiment, the microcontroller is also connect with the field-effect tube, for controlling the work of the field-effect tube
Working frequency variation.Wherein, the partial circuit diagram of vehicle power supply driving circuit is as shown in Fig. 2, voltage input end connects two field effects
Should pipe Q1 and Q2, the Q1 connects LLC resonance circuit with the connecting line of Q2.In the microcontrollers monitor to the load current
When reaching the first preset value or being less than first preset value, it is believed that vehicle power supply underloading, first preset value is according to need
Ask setting, it is preferable that first preset value is 20%, i.e., thinks vehicle when load current is less than or equal to the 20% of rated current
Load power supply is light condition.Field-effect pipe works in higher frequency under light condition in order to prevent at this time, and then it is humorous to influence LLC
The functional reliability of vibrating network, situation of change of the microcontroller according to the load current based on first preset value, control
The variation of the working frequency of the duty ratio and the field-effect tube that are exported to the driving transformer, to reach described in control
The effect of the operating mode of field-effect tube.
Specifically, the operating mode of the field-effect tube includes phase shift and phase shift discontinuous mode, in light load, makes two
Mode of a field-effect tube Q1 and Q2 work in upper frequency and phase shift, wherein phase shifting angle=1- duty ratio, the load current
It is to be positively correlated with duty ratio, the working frequency with the field-effect tube is negative correlation, i.e., it is pre- to be based on described first in load current
If value increases, control and be gradually increased to the duty ratio that the driving transformer exports, until increasing to 1, and controls the field
The working frequency of effect pipe is gradually reduced by present operating frequency；When load current is based on first preset value reduction, then
It controls to the duty ratio that the driving transformer exports and is gradually decrease to certain value, and control the working frequency of the field-effect tube
It is gradually risen by present operating frequency, until being increased to the maximum operating frequency allowed.If the duty ratio is decreased to certain value,
And after the working frequency of field-effect tube is increased to maximum operating frequency, the load current continues to be decreased to zero load, then controls institute
It states duty ratio no longer to reduce, maintains the definite value, and the working frequency for controlling the field-effect tube maintains highest work frequency
Rate.Above scheme is the operating mode of the phase shift of the field-effect tube.
After load current is decreased to zero load, by setting the driving voltage that exports to the field-effect tube of driving transformer
Voltage hysteresis, be maintained at the driving voltage of output in a certain range of cell voltage, if voltage is more than at this time to set
Stagnant ring maximum value, LLC resonant network stop working, at this time magnetic device and capacitive energy storage power supply, and voltage to be output is lower than setting
When stagnant ring minimum value, the restarting of LLC resonant network, alternate run, is discontinuously accounted in this way with driving to substitute very little repeatedly
Empty ratio continues working.Above scheme is the interrupted operating mode of the phase shift of the field-effect tube.
The program passes through control when the light load of vehicle power supply is even unloaded according to the situation of change of load current
The working frequency of the field-effect tube of the duty ratio and vehicle power supply that are exported to driving transformer, make field-effect tube work in phase shift or
Under the interrupted mode of person's phase shift, there are enough electric currents preferably to realize the Sofe Switch of half-bridge MOSFET, and can export more steady
Voltage, avoid the case where causing field-effect tube fever obvious because of vehicle power supply underloading or zero load, influence functional reliability.
In the above embodiment of the present invention, first control module 43 includes:
First control unit, for when the load current reaches the first preset value, control microcontroller to become to driving
The duty ratio of depressor output is the first ratio；
In the embodiment, the load current reaches the first preset value and thinks that vehicle power supply is lightly loaded, and sets microcontroller at this time
The duty ratio that device is exported to driving transformer is the first ratio, and first ratio is set according to demand, can be according to practical reality
Debugging to be tested to obtain, it is preferable that first ratio is 0.8, at this point, field-effect tube work is in phase shift mode, phase shifting angle=
1- duty ratio.
Second control unit, for being accounted for according to described when the load current is changed by first preset value
Than being positively correlated with the load current, the function of the working frequency of the field-effect tube and the load current negative correlation closes sky
System, adjusts the working frequency of the duty ratio and the field-effect tube.
Specifically, second control unit is specifically used for:
When the load current is increased by first preset value, the institute that microcontroller is exported to driving transformer is controlled
It states duty ratio to be increased by first ratio, and controls the field-effect tube and declined by present operating frequency；
When the load current is reduced by first preset value, the institute that microcontroller is exported to driving transformer is controlled
It states duty ratio to be reduced by first ratio, and controls the field-effect tube and increased by present operating frequency；
Specifically, when the load current is decreased to zero load by first preset value, the duty ratio is controlled by institute
It states the first ratio and is decreased to the second ratio, and control the field-effect tube field-effect tube is increased to by present operating frequency and permit
Perhaps maximum operating frequency.
In the embodiment, the duty ratio and the load current are positively correlated, the working frequency of the field-effect tube and institute
Load current negative correlation is stated, second ratio is set according to demand, it is preferable that second ratio is 0.6, i.e., described negative
When load electric current is gradually reduced by first preset value, the duty ratio is controlled by 0.8 and is gradually decrease to 0.6, if the load
Electric current is persistently decreased to zero load, then the duty ratio maintains second ratio, and the working frequency dimension of the field-effect tube
It holds in the maximum operating frequency.
As shown in figure 5, the vehicle power supply drive dynamic control device further include:
Second monitoring modular 44, the driving voltage value exported for monitoring driving transformer to the field-effect tube；
Second control module 45 is used in driving voltage value ring maximum value stagnant greater than predeterminated voltage, described in control
Vehicle power supply stops working；
In the embodiment, the second ratio is decreased to by first ratio in the duty ratio, and the field-effect tube
Working frequency is increased to after maximum operating frequency, the driving voltage exported by setting driving transformer to the field-effect tube
Voltage hysteresis, make output driving voltage be maintained in a certain range of cell voltage, if monitor voltage be more than at this time
The maximum value of the stagnant ring of the predeterminated voltage of setting then controls LLC resonant network and stops working, i.e., the described vehicle power supply stops working,
Magnetic device and capacitive energy storage are actively powered at this time.
Wherein, the purpose that the stagnant ring of the predeterminated voltage is arranged is that the voltage sensor of detection voltage is protected not to be damaged, excellent
Selection of land, the stagnant ring of predeterminated voltage can be ± the 5V of cell voltage.
Third control module 46, for after the vehicle power supply stops working, monitoring that the driving voltage value is less than
When the stagnant ring minimum value of predeterminated voltage, controls the vehicle power supply and start to work.
In the embodiment, after the vehicle power supply stops working, magnetic device and capacitive energy storage replace vehicle power supply master
The voltage value of dynamic power supply, the vehicle power supply output is gradually reduced, and is monitoring driving voltage value less than the stagnant ring of predeterminated voltage most
When small value, control LLC resonant network restarting, the vehicle power supply is started to work, repeatedly alternate run, in this way with drive
Dynamic circuit breaker continues to substitute very little duty ratio and continue working, and in the case where interrupter duty, has enough electric currents preferably to realize half-bridge
The Sofe Switch of MOSFET, and more stable voltage can be exported, it avoids because vehicle power supply underloading or zero load lead to field-effect tube
The case where fever is obvious, influences functional reliability.
It should be noted that the device is device corresponding with above-mentioned individual recommended method, institute in above method embodiment
There is implementation suitable for the embodiment of the device, can also reach identical technical effect.
The embodiments of the present invention also provide a kind of microcontroller, including processor, memory and it is stored in the storage
On device and the computer program that can run on the processor, realized when the computer program is executed by the processor
The step of vehicle power supply drive control method stated.
The embodiments of the present invention also provide a kind of automobiles, including above-mentioned vehicle power supply drive dynamic control device.
The embodiment of the invention, it is even unloaded in the light load of vehicle power supply according to the situation of change of load current
When, the working frequency of the field-effect tube by controlling the duty ratio and vehicle power supply that export to driving transformer makes field-effect tube
Work has enough electric currents preferably to realize the Sofe Switch of half-bridge MOSFET, and energy under the interrupted mode of phase shift or phase shift
More stable voltage is exported, is avoided because vehicle power supply underloading or zero load cause field-effect tube fever obvious, influencing work can
By property the case where.
Above-described is the preferred embodiment of the present invention, it should be pointed out that the ordinary person of the art is come
It says, can also make several improvements and retouch under the premise of not departing from principle of the present invention, these improvements and modifications also exist
In protection scope of the present invention.
Claims (10)
1. a kind of vehicle power supply drive control method characterized by comprising
Obtain the load current of vehicle power supply；
Monitor the situation of change of the load current；
When the load current reaches the first preset value, it is defeated to driving transformer that microcontroller is controlled according to the situation of change
Change in duty cycle out, and control the working frequency variation of the field-effect tube of the vehicle power supply.
2. vehicle power supply drive control method according to claim 1, which is characterized in that reach in the load current
When one preset value, the change in duty cycle that microcontroller is exported to driving transformer is controlled according to the situation of change, and control institute
State the field-effect tube of vehicle power supply working frequency variation the step of include:
When the load current reaches the first preset value, the duty ratio that control microcontroller is exported to driving transformer is first
Ratio；
When the load current is changed by first preset value, according to the duty ratio and the load current positive
It closes, the functional relation of the working frequency of the field-effect tube and the load current negative correlation, adjusts the duty ratio and described
The working frequency of field-effect tube.
3. vehicle power supply drive control method according to claim 2, which is characterized in that the adjustment duty ratio and
The step of working frequency of the field-effect tube includes:
When the load current is decreased to zero load by first preset value, controls the duty ratio and subtracted by first ratio
As low as the second ratio, and control the field-effect tube and the highest work that the field-effect tube allows is increased to by present operating frequency
Frequency.
4. vehicle power supply drive control method according to claim 3, which is characterized in that in the duty ratio by described
One ratio is decreased to the second ratio, and the working frequency of the field-effect tube is increased to after maximum operating frequency, the method
Further include:
The driving voltage value that monitoring driving transformer is exported to the field-effect tube；
In driving voltage value ring maximum value stagnant greater than predeterminated voltage, controls the vehicle power supply and stop working；
After the vehicle power supply stops working, when monitoring that the driving voltage value is less than the stagnant ring minimum value of predeterminated voltage, control
The vehicle power supply is made to start to work.
5. a kind of vehicle power supply drive dynamic control device characterized by comprising
First obtains module, for obtaining the load current of vehicle power supply；
First monitoring modular, for monitoring the situation of change of the load current；
First control module, for controlling micro-control according to the situation of change when the load current reaches the first preset value
The change in duty cycle that device processed is exported to driving transformer, and control the working frequency variation of the field-effect tube of the vehicle power supply.
6. vehicle power supply drive dynamic control device according to claim 5, which is characterized in that the first control module packet
It includes:
First control unit, for controlling microcontroller to driving transformer when the load current reaches the first preset value
The duty ratio of output is the first ratio；
Second control unit, for when the load current is changed by first preset value, according to the duty ratio
It is positively correlated, the functional relation of the working frequency of the field-effect tube and the load current negative correlation, adjusts with the load current
The working frequency of the whole duty ratio and the field-effect tube.
7. vehicle power supply drive dynamic control device according to claim 6, which is characterized in that second control unit is specific
For:
When the load current is decreased to zero load by first preset value, controls the duty ratio and subtracted by first ratio
As low as the second ratio, and control the field-effect tube and the highest work that the field-effect tube allows is increased to by present operating frequency
Frequency.
8. vehicle power supply drive dynamic control device according to claim 7, which is characterized in that the vehicle power supply drive control
Device further include:
Second monitoring modular, the driving voltage value exported for monitoring driving transformer to the field-effect tube；
Second control module, for controlling the vehicle mounted electric in driving voltage value ring maximum value stagnant greater than predeterminated voltage
Source stops working；
Third control module, for after the vehicle power supply stops working, monitoring that the driving voltage value is less than default electricity
When pressing stagnant ring minimum value, controls the vehicle power supply and start to work.
9. a kind of microcontroller, which is characterized in that including processor, memory and be stored on the memory and can be described
The computer program run on processor is realized when the computer program is executed by the processor as in Claims 1 to 4
The step of described in any item vehicle power supply drive control methods.
10. a kind of automobile, which is characterized in that filled including vehicle power supply drive control described in any one of claim 5~8
It sets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811009330.1A CN108933524B (en) | 2018-08-31 | 2018-08-31 | Vehicle-mounted power supply drive control method and device, microcontroller and automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811009330.1A CN108933524B (en) | 2018-08-31 | 2018-08-31 | Vehicle-mounted power supply drive control method and device, microcontroller and automobile |
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| CN108933524A true CN108933524A (en) | 2018-12-04 |
| CN108933524B CN108933524B (en) | 2020-01-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994469A (en) * | 2021-03-22 | 2021-06-18 | 阳光电源股份有限公司 | Full-bridge LLC converter control method and device and storage medium |
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| CN102281047A (en) * | 2010-06-13 | 2011-12-14 | 深圳市英可瑞科技开发有限公司 | LLC (resonance inductor, magnetizing inductor and resonance capacitor) series resonance combined controller |
| CN104600988A (en) * | 2013-10-31 | 2015-05-06 | 三星电机株式会社 | Power supply apparatus |
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2018
- 2018-08-31 CN CN201811009330.1A patent/CN108933524B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102281047A (en) * | 2010-06-13 | 2011-12-14 | 深圳市英可瑞科技开发有限公司 | LLC (resonance inductor, magnetizing inductor and resonance capacitor) series resonance combined controller |
| CN104600988A (en) * | 2013-10-31 | 2015-05-06 | 三星电机株式会社 | Power supply apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112994469A (en) * | 2021-03-22 | 2021-06-18 | 阳光电源股份有限公司 | Full-bridge LLC converter control method and device and storage medium |
| CN112994469B (en) * | 2021-03-22 | 2022-09-13 | 阳光电源股份有限公司 | Full-bridge LLC converter control method and device and storage medium |
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| CN108933524B (en) | 2020-01-14 |
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