CN106685228A - Closed loop control method and direct current method and direct current converter - Google Patents
Closed loop control method and direct current method and direct current converter Download PDFInfo
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- CN106685228A CN106685228A CN201710134500.8A CN201710134500A CN106685228A CN 106685228 A CN106685228 A CN 106685228A CN 201710134500 A CN201710134500 A CN 201710134500A CN 106685228 A CN106685228 A CN 106685228A
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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
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Abstract
The invention provides a closed loop control method and direct current method and direct current converter based on Monte Carlo method, wherein the closed loop control method based on Monte Carlo method comprises the following steps: Collecting an output value (Uout) at every random interval (t); comparing the recent n Uout with U1 in size from the n times of collection; assuming the number of Uout that is bigger than U1 is a and the number of Uout that is smaller than U1 is b; calculating adjusting factor(c) according to the size of a and b; Controlling output value (Uout) according to adjusting factor(c); realizing closed loop control of output value (Uout) by repeating the above steps. Given the method, modified procedure of controlling value is more gentle and mild without much fluctuation. The controlling value can be fixed before approaching the upper or lower limit of a closed loop and stay near a set value.
Description
Technical field
The present invention relates to electric current and voltage close loop control field, in particular to a kind of closing based on monte carlo method
Ring control method and the DC-to-dc conversion method and DC-to-DC converter using the method.
Background technology
The accumulator output voltage of electric automobile is different with Rated motor voltage and vehicle electronic device control voltage, if thinking
Allow accumulator to power to motor or vehicle electronic device to be accomplished by changing accumulator output voltage, generally using direct current-
DC converting circuit.
Wherein, the output voltage of accumulator, the i.e. input voltage of DC-to-dc change-over circuit are Uin, DC-to-dc conversion
The output voltage of circuit is Uout。
Typically, Uout=k*Uin, wherein k is conversion coefficient, can be set manually and adjust, so that output voltage
UoutReach required value, and output voltage UoutNeed to keep stable.
However, input voltage is UinA not constant value, this is because, with the use of accumulator, accumulator
Output voltage can be gradually lowered, also, ambient air temperature also has certain impact, accumulator during low temperature to the output voltage of accumulator
Output voltage is relatively low, and accumulator output voltage is higher when temperature is high；Additionally, the vibration in vehicle travel process, and other one
A little uncertain factors, to the course of work of DC-to-dc change-over circuit certain interference is will also result in, and causes conversion coefficient k meetings
There is a range of fluctuation.Above-mentioned factor is superimposed so that output voltage UoutAlso certain fluctuation, this ripple can be produced
It is dynamic that both there is overall variation tendency, and with certain randomness.
In order to ensure the output voltage U of the running voltage of motor or vehicle electronic device, i.e. DC-to-dc change-over circuitout
Substantially constant, needs to carry out closed loop control to DC-to-dc transformation process.
The closed loop is also feedback control system, be by the measured value of system output compared with desired set-point
Compared with, a deviation signal is thus produced, control is adjusted using this deviation signal, make output valve try one's best close to expected value.
Specifically, traditional closed loop control method, mainly comprises the following steps：Setting closed loop upper and lower bound, if output voltage
UoutMore than or equal to the closed loop upper limit, then conversion coefficient k is reduced, if output voltage UoutLess than or equal to closed loop lower limit, then conversion is raised
Coefficient k.
Traditional method, principle is simple, it is easy to accomplish, but also there are some drawbacks.Because output voltage UoutOnce touch
The upper limit or lower limit of closed loop, will be reduced or be raised to conversion coefficient k immediately, may cause output voltage UoutSaltus step frequency
Numerous, unitary sampling result is exceeded caused by accidentalia, can cause unnecessary makeover process, and output voltage UoutDuring amendment
Amplitude of variation is not steady enough, easily produces impact to electrical appliance, affects the life-span of electrical appliance.
If output voltage UoutSkew there is certain rule, can be according to rule look-ahead output voltage Uout, and
Conversion coefficient k is corrected in advance, to avoid output voltage UoutThe upper limit or lower limit of closed loop are touched, output voltage U is madeoutIt is more steady
It is fixed.But due to output voltage UoutFluctuation have uncertainty, this method can not be general in all occasions.
The content of the invention
For this purpose, the main purpose of the invention be a kind of closed loop control method based on monte carlo method is provided with
And using the DC-to-dc conversion method and DC-to-DC converter of the method, to reach following purpose：So that closed loop control
During, it is more gentle gentle by controlling value (such as voltage, electric current) change procedure, slow down by the fluctuation of controlling value, controlled
Value also can be better maintained near setting value.
For achieving the above object, the present invention provides following technical scheme：
An a kind of pattern of the invention, closed loop control method based on monte carlo method, comprises the following steps：If
Input value is Uin, output valve Uout, conversion coefficient is k, and closed loop lower limit is U0, closed loop standard value is U1, the closed loop upper limit is U2；It is known
Uout=k*Uin, wherein k can be set manually and adjust, so that output valve UoutReach required value；Every random time
Interval t, gathers output valve Uout, from collection n-th, compare the nearest n U for collectingoutWith U1Size, if being more than
U1UoutNumber be a, less than U1UoutNumber be b；If a>B, Dynamic gene c=(a-b)/n* (U2-U1)/(U2-
U0), k=(1-c) * k are set；Or if a<B, Dynamic gene c=(a-b)/n* (U1-U0)/(U2-U0), k=(1-c) * is set
k；Thus, output valve UoutWill accordingly change；Circulating repetition above step, you can realize output valve UoutClosed loop control
System.
A kind of two pattern of the invention, DC-to-dc conversion method, comprises the steps of：Step S200, it is soft to open
It is dynamic, after start, certain hour is waited, afterwards control unit sends full-bridge drive signal, the full-bridge according to the voltage to be exported
Drive signal is square wave；Step S220, to input voltage, input current, output voltage, output current, full-bridge temperature, rectification
Temperature is sampled, and eliminates interference to the sampled data for obtaining using digital filtering algorithm, if input voltage is over-pressed, be input into electricity
Under-voltage, input current excessively stream is pressed, output voltage is over-pressed, output voltage is under-voltage, output current excessively stream, full-bridge inverting unit excess temperature,
Or synchronous rectification unit excess temperature, then shut down, after waiting certain hour, then start shooting, return to step S220；Step S230, by temperature
Degree, voltage close loop algorithm calculate and export the dutycycle of the full-bridge drive signal, concretely comprise the following steps：Sub-step S300, if adopting
Sample temperature reaches closed loop thermal, per liter of 1 DEG C of reduction rated power 10%, sub-step S310, by a pattern of the invention
The described closed loop control method based on monte carlo method performs voltage close loop control；Return to step S220, and while into
Step S240；Step S240, judges whether to meet and opens synchronous rectification condition, if so, delayed start-up synchronous rectification, if it is not, fast
Speed closes synchronous rectification.
Three pattern of the invention, a kind of DC-to-DC converter, including：Control unit, according to the number for collecting
According to by the DC-to-dc conversion method described in two pattern of the invention, controlling to the DC-to-DC converter
System；Full-bridge inverting unit, voltage transformation unit, synchronous rectification unit, are sequentially connected in series between direct-flow input end and DC output end；It is defeated
Enter voltage sampling unit, be connected between the direct-flow input end and described control unit, for transmitting to described control unit
Input voltage sampled data；Input current sampling unit, is connected between the direct-flow input end and described control unit, is used for
Input current sampled data is transmitted to described control unit；Output voltage sampling unit, is connected on the DC output end and institute
State between control unit, for transmitting output voltage sampled data to described control unit；Output current sampling unit, is connected on
Between the DC output end and described control unit, for transmitting output current sampled data to described control unit；Full-bridge
Driver element, is connected between described control unit and the full-bridge inverting unit, receives from described control unit for basis
The signal for arriving, drives the full-bridge inverting cell operation；Full-bridge temperature sampling unit, is connected on described control unit complete with described
Between bridge inversion unit, for monitoring the temperature of the full-bridge inverting unit, and full-bridge temperature data is transmitted to the control
Unit；Rectification drive unit, is connected between described control unit and the synchronous rectification unit, for basis from the control
The signal that unit is received, drives the synchronous rectification cell operation；Rectification temperature sampling unit, is connected on described control unit
Between the synchronous rectification unit, for monitoring the temperature of the synchronous rectification unit, and by rectification temperature data transmit to
Described control unit.
Closed loop control method based on monte carlo method of the invention, can make in closed loop control process, controlled
Value (such as voltage, electric current) makeover process processed is more gentle gentle, slows down by the fluctuation of controlling value, and by controlling value closed loop is being touched
Can just be corrected before the upper limit or lower limit, enable preferably to be maintained near setting value by controlling value.The present invention's closes
Ring control method is applied in voltage/current closed loop control process, and the process for correcting voltage/current will be more gentle gentle,
And unnecessary makeover process is reduced, and voltage/current is better maintained near setting value, reach the basic of voltage/current
It is constant, the impact to electrical appliance is reduced, more stably worked using electrical equipment, extend the life-span of electrical appliance.
The DC-to-dc conversion method of the closed loop control method using based on monte carlo method of the invention and straight
Stream-direct current transducer, improves the energy conversion efficiency of electric energy, realizes to input, the voltage of output, electric current and transducer
Temperature monitor in real time, realize temperature closed loop, voltage close loop, voltage and current is stably exported.
Description of the drawings
Fig. 1 is the flow process of the closed loop control method based on monte carlo method of the exemplary embodiment of present inventive concept
Figure；
Fig. 2 is the use of the exemplary embodiment of present inventive concept based on the straight of the closed loop control method of monte carlo method
The pie graph of stream-direct current transducer；
Fig. 3 is the use of the exemplary embodiment of present inventive concept based on the straight of the closed loop control method of monte carlo method
The flow chart of stream-direct current conversion method；
Fig. 4 is temperature of the use of the exemplary embodiment of present inventive concept based on the closed loop control method of monte carlo method
Degree, the flow chart of voltage close loop control；
Fig. 5 be the exemplary embodiment of present inventive concept do not make voltage close loop control when output voltage UoutCurve chart；
Fig. 6 is that the use of the exemplary embodiment of present inventive concept is carried out based on the closed loop control method of monte carlo method
Output voltage U when voltage close loop is controlledoutCurve chart.
Specific embodiment
Detailed content and technology explanation with regard to the invention, is now described further with embodiment, it will be appreciated that
, these embodiments are only used to illustrate, and are not necessarily to be construed as the restriction of the invention enforcement.
For example, the input voltage U of the DC-to-DC converter of the voltage of accumulator of electric car, the i.e. embodiment of the present inventionin
Initial value be 700V, with the use of accumulator, voltage is gradually lowered；Known output voltage Uout=k*Uin, wherein k is to turn
Coefficient is changed, initial value is manually set to 0.05, with the operation of transformation process, there is fluctuation within a narrow range.Voltage close loop upper limit U2For
37V, closed loop voltage setting value U1For 35V, closed loop lower limit U0For 33V.If not to output voltage UoutIt is modified, output voltage
Uout27.23V will be always displaced to from 35V (as shown in the row of table 1 the 1st~4 and Fig. 5).
Therefore need using the closed loop control method based on monte carlo method of the present invention to output voltage UoutRepaiied
Just.
Fig. 1 is the stream of the closed loop control method based on monte carlo method of the exemplary embodiment according to present inventive concept
Cheng Tu.With reference to Fig. 1, the closed loop control method based on monte carlo method of the invention, be applied to the direct current of electric automobile-
DC converting circuit, with the output voltage U to DC-to-dc change-over circuitoutClosed loop control is carried out, is comprised the following steps that：
Every random time intervals t (step S10), an output voltage U is gatheredout(step S20), from collection n-th
(step S30), compares the nearest n U for collectingoutWith U1Size, if be more than U1UoutNumber be a, less than U1Uout
Number be b (step S40).
In the present embodiment, t=0.01+0.005r (second) is could be arranged to, r is the random number between 0~1, n=10, i.e.,
From the 10th U of collectionoutRise, compare nearest 10 U for collectingoutWith U1Size；
If a>B (step S50), Dynamic gene c=(a-b)/n* (U2-U1)/(U2-U0) (step S60)；
If a<B (step S51), Dynamic gene c=(a-b)/n* (U1-U0)/(U2-U0), (step S61)；
Otherwise c=0 (step S62)；
K=(1-c) * k are set, consequently, it is possible to output voltage UoutWill accordingly change (step S70)；
Circulating repetition above step, you can realize output voltage UoutClosed loop control (as shown in table 1 and Fig. 6).
With reference to the row of table the 1, the 1st~10, conversion coefficient k is equal to former conversion coefficient k before amendment；From the 11st row, each collection
Change conversion coefficient k after amendment when coefficient k is all upper collection moment t before amendment during moment t to be superimposed after small sample perturbations
Result；The output voltage U collected during each collection moment toutFor output voltage U before amendmentout, output voltage before the amendment
UoutTo change coefficient k and input voltage U before the t amendmentinProduct.
Table 1
Here, being illustrated by taking voltage as an example, above Uin、Uout、U1、U2And U0Electric current is readily adaptable for use in, to carry out
Closed-loop current control.
Monte carlo method, also referred to as statistical simulation methods, are development and electronics of 1940 mid-nineties 90s due to science and technology
The invention of computer, and a kind of numerical computation method with Probability Statistics Theory as guidance for proposing, are that one kind uses random number
The method of (or more conventional pseudo random number) to solve many computational problems.
Monte carlo method is applied closed loop control in voltage (or electric current) by the present invention, by generating random number, with
The time interval of machine is to output voltage UoutSampled, and fully taken into account the randomness of sampled result, with output voltage Uout
Based on the probability statistics result of distribution, to output voltage UoutIt is modified, the sampling for realizing more science is covered, it is to avoid
The interference of accidentalia, makes Closed-cycle correction process more gentle gentle.
Closed loop control method based on monte carlo method of the invention, can make in closed loop control process, controlled
Value (such as voltage, electric current) makeover process processed is more gentle gentle, slows down by the fluctuation of controlling value, and by controlling value closed loop is being touched
Can just be corrected before the upper limit or lower limit, enable preferably to be maintained near setting value by controlling value.The present invention's closes
Ring control method is applied in voltage/current closed loop control process, and the process for correcting voltage/current will be more gentle gentle,
And unnecessary makeover process is reduced, and voltage/current is better maintained near setting value, reach the basic of voltage/current
It is constant, the impact to electrical appliance is reduced, more stably worked using electrical equipment, extend the life-span of electrical appliance.
More than, to the closed loop control method based on monte carlo method of the exemplary embodiment according to present inventive concept
Flow process is illustrated.Then, to use the closing based on monte carlo method of the exemplary embodiment according to present inventive concept
The operation principle of the DC-to-DC converter of ring control method is described as follows.
Fig. 2 is the use of the exemplary embodiment of present inventive concept based on the straight of the closed loop control method of monte carlo method
The pie graph of stream-direct current transducer；Fig. 3 is use the closing based on monte carlo method of the exemplary embodiment of present inventive concept
The flow chart of the DC-to-dc conversion method of ring control method；Fig. 4 is that the use of the exemplary embodiment of present inventive concept is based on
The temperature of the closed loop control method of monte carlo method, the flow chart of voltage close loop control.
Referring to Fig. 2, the closed loop control of monte carlo method is based on according to the use of the exemplary embodiment of present inventive concept
The operation principle of the DC-to-DC converter of method is as follows：Input dc power Jing direct-flow input ends 100 are input into full-bridge inverting unit
101 are converted to alternating current, through voltage transformation unit 102 boost or blood pressure lowering after, the rectification of synchronized rectification unit 103 be unidirectional current, Jing
DC output end 104 is exported.Wherein, enable input 131 and receive enable signal, then control unit 130 is started working, control
Unit 130 to full-bridge driver element 121 exports full-bridge drive signal, and full-bridge driver element 121 drives the work of full-bridge inverting unit 101
Make；Control unit 130 to rectification drive unit 122 exports synchronous rectification signal, and rectification drive unit 122 drives synchronous rectification list
Unit 103 works.When the DC-to-DC converter works, the collection direct-flow input end 100 of input voltage sampling unit 111
Voltage data, and it is sent to control unit 130；Input current sampling unit 112 gathers the current data of direct-flow input end 100,
And it is sent to control unit 130；Output voltage sampling unit 115 gathers the voltage data of DC output end 104, and is sent to control
Unit processed 130；Output current sampling unit 116 gathers the current data of DC output end 104, and is sent to control unit 130；
The temperature data of the collection full-bridge inverting of full-bridge temperature sampling unit 113 unit 101, and it is sent to control unit 130；Rectification temperature
The temperature data of the collection synchronous rectification of sampling unit 114 unit 103, and it is sent to control unit 130；The basis of control unit 130
Whether the data such as the voltage, electric current, the temperature that collect, the dutycycle of real-time adjustment full-bridge drive signal, control synchronous rectification opens
Open, and the dutycycle of adjustment rectification drive signal.
Here, the synchronous rectification is referred to control sense of current in rectifier bridge by rectification drive signal, so as to avoid
The pressure drop that diode is caused in conventional rectification bridge, saves energy, improves the energy conversion efficiency of electric energy.
Referring to Fig. 3, the use for describing the exemplary embodiment according to present inventive concept in detail is based on monte carlo method
The workflow of the DC-to-DC converter of closed loop control method.Direct-flow input end 100 connects unidirectional current, enables signal input
End 131 receives enable signal, and DC-to-DC converter soft start waits certain hour (such as 2s), make each component voltage
Stable, control unit 130 sends full-bridge drive signal according to the voltage to be exported, and the full-bridge drive signal is square wave (step
Rapid S200)；Input voltage sampling unit 111 gathers input voltage, the collection input current of input current sampling unit 112, output
Voltage sampling unit 115 gathers output voltage, the collection output current of output current sampling unit 116, full-bridge temperature sampling unit
The temperature of 113 collection full-bridge inverting units 101, the temperature of the collection synchronous rectification of rectification temperature sampling unit 114 unit 103, control
Unit processed 130 eliminates interference using digital filtering algorithm to the sampled data for obtaining, and judges whether input voltage overvoltage, input electricity
Under-voltage, input current excessively stream is pressed, output voltage is over-pressed, output voltage is under-voltage, output current excessively stream, full-bridge inverting unit excess temperature,
Or synchronous rectification unit excess temperature (step S220), if there is one of above-mentioned situation, shut down (step S221), wait certain hour
(such as 2s) starts shooting (step S222) afterwards, and again whether decision circuitry under-voltage, over-pressed, excessively stream, excess temperature (step S220).Above-mentioned step
Suddenly the described DC/DC convertor circuitry of protection, and the effect of protection load electrical appliance are served.
According to the full-bridge temperature, rectification temperature, output voltage, the output current that collect, the voltage, electricity according to rated output
Stream and power, using closed loop algorithm, control unit 130 adjusts the dutycycle of full-bridge drive signal, makes temperature, voltage reach closed loop
State (step S230).
The step of coming back to whether under-voltage, over-pressed decision circuitry, excessively stream, excess temperature (step S220), and while into sentencing
Break the step of whether meeting the condition for opening synchronous rectification (step S240).
Judge whether to meet the condition for opening synchronous rectification (such as output voltage is more than 25V, and output current is more than 50A)
(step S240), if meeting, delayed start-up synchronous rectification (step S241), otherwise closes rapidly synchronous rectification (step S242).
Referring to Fig. 4, the temperature, voltage close loop control, idiographic flow is as follows：First determine whether full-bridge temperature or rectification temperature
Closed loop thermal (step S300) whether is reached, if reaching, temperature often raises 1 DEG C, makes rated power reduce by 10% (step S301),
Voltage close loop control (step S310) is otherwise performed, voltage close loop control (step S310) is the special based on covering of the present invention
The closed loop control method (step S10~S70) of Carlow method.
The DC-to-dc conversion method of the closed loop control method using based on monte carlo method of the invention and straight
Stream-direct current transducer, improves the energy conversion efficiency of electric energy, realizes to input, the voltage of output, electric current and transducer
Temperature monitor in real time, realize temperature closed loop, voltage close loop, voltage and current is stably exported.
The above is only the preferred embodiment of the invention, it is impossible to limit the enforcement model of the invention with this
Enclose, i.e., every simple equivalence changes made according to the invention claim and innovation and creation description and modification,
All still fall within the scope that the invention is covered.
Claims (3)
1. a kind of closed loop control method based on monte carlo method, it is characterised in that comprise the following steps：
If input value is Uin, output valve Uout, conversion coefficient is k, and closed loop lower limit is U0, closed loop standard value is U1, the closed loop upper limit is
U2；Known Uout=k*Uin, wherein can be set manually and adjust, so that output valve UoutReach required value；
Every random time intervals t, output valve U is gatheredout, from collection n-th, compare the nearest n U for collectingout
With U1Size, if be more than U1UoutNumber be a, less than U1UoutNumber be b；
If a>B, Dynamic gene c=(a-b)/n* (U2-U1)/(U2-U0), k=(1-c) * k are set；Or
If a<B, Dynamic gene c=(a-b)/n* (U1-U0)/(U2-U0), k=(1-c) * k are set；
Thus, output valve UoutWill accordingly change；
Circulating repetition above step, that is, realize output valve UoutClosed loop control.
2. a kind of DC-to-dc conversion method, it is characterised in that comprise the steps of：
Step S200, soft start after start, waits certain hour, and afterwards control unit sends full-bridge according to the voltage to be exported
Drive signal, the full-bridge drive signal is square wave；
Step S220, samples to input voltage, input current, output voltage, output current, full-bridge temperature, rectification temperature,
And interference is eliminated to the sampled data for obtaining using digital filtering algorithm, and if input voltage is over-pressed, input voltage is under-voltage, input electricity
Flow through, output voltage is over-pressed, output voltage is under-voltage, output current excessively stream, full-bridge inverting unit excess temperature, or synchronous rectification unit
Excess temperature, then shut down, and after waiting certain hour, then starts shooting, return to step S220；
Step S230, calculates and exports the dutycycle of the full-bridge drive signal, concrete steps by temperature, voltage close loop algorithm
For：Sub-step S300, if sample temperature reaches closed loop thermal, per liter of 1 DEG C of reduction rated power 10%, sub-step S310 passes through
Closed loop control method based on monte carlo method according to claim 1 performs voltage close loop control；
Return to step S220, and while into step S240；
Step S240, judges whether to meet synchronous rectification condition of opening, if so, delayed start-up synchronous rectification, if it is not, rapid close
Synchronous rectification.
3. a kind of DC-to-DC converter, it is characterised in that include：
Control unit, according to the data for collecting, by DC-to-dc conversion method according to claim 2, to described
DC-to-DC converter is controlled；
Full-bridge inverting unit, voltage transformation unit, synchronous rectification unit, are sequentially connected in series between direct-flow input end and DC output end；
Input voltage sampling unit, is connected between the direct-flow input end and described control unit, for single to the control
Unit's transmission input voltage sampled data；
Input current sampling unit, is connected between the direct-flow input end and described control unit, for single to the control
Unit's transmission input current sampled data；
Output voltage sampling unit, is connected between the DC output end and described control unit, for single to the control
Unit's transmission output voltage sampled data；
Output current sampling unit, is connected between the DC output end and described control unit, for single to the control
Unit's transmission output current sampled data；
Full-bridge driver element, is connected between described control unit and the full-bridge inverting unit, for basis from the control
The signal that unit is received, drives the full-bridge inverting cell operation；
Full-bridge temperature sampling unit, is connected between described control unit and the full-bridge inverting unit, described complete for monitoring
The temperature of bridge inversion unit, and full-bridge temperature data is transmitted to described control unit；
Rectification drive unit, is connected between described control unit and the synchronous rectification unit, for basis from the control
The signal that unit is received, drives the synchronous rectification cell operation；
Rectification temperature sampling unit, is connected between described control unit and the synchronous rectification unit, described same for monitoring
The temperature of step rectification unit, and rectification temperature data is transmitted to described control unit.
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| CN108390571A (en) * | 2018-03-07 | 2018-08-10 | 湖南大学 | A kind of tundish electromagnetic heating power supply constant-temperature control method |
| CN111506029A (en) * | 2020-04-10 | 2020-08-07 | 王士波 | Resource allocation method and device |
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| CN103973105A (en) * | 2013-12-10 | 2014-08-06 | 国家电网公司 | Method for controlling high-dynamic properties of high-power bidirectional DC/DC converters |
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| CN111506029A (en) * | 2020-04-10 | 2020-08-07 | 王士波 | Resource allocation method and device |
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