CN103715863A - Converter and heat equalization control method of power device of converter - Google Patents
Converter and heat equalization control method of power device of converter Download PDFInfo
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- CN103715863A CN103715863A CN201210370706.8A CN201210370706A CN103715863A CN 103715863 A CN103715863 A CN 103715863A CN 201210370706 A CN201210370706 A CN 201210370706A CN 103715863 A CN103715863 A CN 103715863A
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Abstract
The invention discloses a converter and a heat equalization control method of a power device of the converter. The converter comprises at least two power modules in parallel connection, an average value determining module used for determining the current or power average value of the at least two power modules, given value determining modules which are corresponding to each power module and are used for determining current or power given values for corresponding power modules according to heat radiation information of power devices and current or power average values of the corresponding power modules, feedback value determining modules which are corresponding to each power module and are used for sampling the current or power of corresponding power modules, and adopting sampled current or power as current or power feedback values of the corresponding power modules, and regulators which are corresponding to each power module and are used for generating control singles of corresponding power modules according to the given values and feedback values of the corresponding power modules. With the converter and the heat equalization control method of the power device of the converter of the invention adopted, heat equalization of the power device of each power module can be realized.
Description
Technical field
The present invention relates to electric energy conversion field, relate in particular to the equal heat control method of a kind of converter and power device thereof.
Background technology
Modern converter generally adopts the method for a plurality of power model parallel connections to increase output current and improves power grade.Directly in parallel and not in addition control can cause not current-sharing, cause that the power model heating that electric current is larger is serious, reliability reduces.Power model in parallel generally the mode by closed-loop control to each power model output pwm signal, thereby realize each power model current-sharing, consistent to guarantee each power model electric current and the power consumption of parallel connection.
Although sharing control has guaranteed that power model loss in parallel is consistent,, in Practical Project, due to power device, be subject to the restrictions such as structure, space, the radiating condition difference of each power device may be very large.Sharing control can cause the power device of weak heat-dissipating completely, as large in temperature rises such as inductance, switching devices, may cause device to cross cause thermal damage, and the good device of radiating condition can not be brought into play its ability completely under extreme case.Example Boost converter as shown in Figure 1, boosts to 750V by the direct current of the 300V～700V of input.Circuit theory diagrams are as follows: take power inductance as example explanation soaking principle, the soaking of IGBT constant power device also in like manner.Inductance L 1, L2 are the inductance in A group Boost circuit, and L3, L4 are the inductance in B group Boost circuit.Because being subject to space and structural limitations, inductance L 1, L2 are placed on air channel weather, and inductance L 3, L4 are positioned over leeward, air channel.The in the situation that of A, two groups of fully uniform-flows of B, the temperature of inductance L 1, L2 than inductance L 3, L4 low 10 ℃～15 ℃.Under case of heavy load, inductance L 3, L4 can be overheated, and inductance L 1, L2 can not be brought into play its ability completely.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned power model of prior art when the parallel connection owing to being subject to the impact of space, structure to make power device cross cause thermal damage or can not bring into play its ability completely, provide a kind of.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of converter, comprise at least two power models in parallel, described each power model comprises power device, and described converter also comprises:
Mean value determination module, for determining electric current or the power average value of at least two power models;
The set-point determination module corresponding with each power model, for being that corresponding power module is determined electric current or power given value according to the heat radiation information of the power device of corresponding power module and described electric current or power average value;
The value of feedback determination module corresponding with each power model, for the electric current of corresponding power module or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module;
The adjuster corresponding with each power model, for generate the control signal of corresponding power module according to the set-point of corresponding power module and value of feedback, to realize the soaking of the power device of each power model.
In converter of the present invention, described set-point determination module is determined electric current or power given value for the mode by heat test for each power model.
In converter of the present invention, described set-point determination module comprises temperature sampling unit, thermoregulator and determining unit, and described converter also comprises computing module, wherein,
Described temperature sampling unit, for carrying out temperature sampling to the power device of corresponding power module;
Described computing module, for according to the temperature sampling value of the power device of each power model, calculates the temperature sampling mean value of the power device of at least two power models;
Described thermoregulator, for according to the temperature sampling value of the power device of corresponding power module and described temperature sampling mean value, generates electric current or the difference power score value of corresponding power module;
Described determining unit, for according to electric current or the difference power score value of described electric current or power average value and described corresponding power module, generates electric current or the power given value of corresponding power module.
In converter of the present invention, described current regulator or described thermoregulator are PID adjuster.
In converter of the present invention, described power model is rectification module, inversion module, DC-DC conversion module or AC-AC conversion module.
In converter of the present invention, described power device is inductance, switching tube, diode.
The present invention also constructs a kind of equal heat control method of power device of converter, it is characterized in that, comprising:
S11. determine electric current or the power average value of at least two power models;
S12. according to the heat radiation information of the power device of corresponding power module and described electric current or power average value, be that corresponding power module is determined electric current or power given value;
S13. the electric current of corresponding power module or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module;
S14. according to the control signal of the set-point of corresponding power module and value of feedback generation corresponding power module, to realize the soaking of the power device of each power model.
In equal heat control method of the present invention, in described step S12, the mode by heat test is determined electric current or power given value for each power model.
In equal heat control method of the present invention, in described step S12, according to step below, determine electric current or power given value:
The power device of corresponding power module is carried out to temperature sampling;
According to the temperature sampling value of the power device of each power model, calculate the temperature sampling mean value of the power device of at least two power models;
According to the temperature sampling value of the power device of corresponding power module and described temperature sampling mean value, generate electric current or the difference power score value of corresponding power module;
According to electric current or the difference power score value of described electric current or power average value and described corresponding power module, generate electric current or the power given value of corresponding power module.
In equal heat control method of the present invention, in described step S14, by the mode that PI regulates or P regulates, generate the control signal of corresponding power module.
Implement technical scheme of the present invention, because the set-point of electric current or power is determined according to heat radiation information and electric current or power average value, the power device radiating condition of supposing certain power model is good, the electric current of this power model or power given value will be greater than electric current or power average value, on the contrary, the electric current of this power model or power given value will be less than electric current or power average value.Then, under the adjusting of adjuster, the electric current of this power model or Feedback of Power value be follow current or power given value all the time, thereby makes electric current or the power of power device of the power model that radiating condition is good larger, can bring into play to large extent its ability; And electric current or the power of the power device of the poor power model of radiating condition are less, can avoid overheated and damage.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the circuit diagram of the Boost converter that comprises two power models in parallel;
Fig. 2 is the logic diagram of converter embodiment mono-of the present invention;
Fig. 3 is the loop figure of the operation principle of the converter shown in Fig. 2;
Fig. 4 is the logic diagram of converter embodiment bis-of the present invention;
Fig. 5 is the loop figure of the operation principle of the converter shown in Fig. 4;
Fig. 6 is the flow chart of equal heat control method embodiment mono-of the power device of converter of the present invention;
Fig. 7 is the flow chart of step S12 preferred embodiment in Fig. 6.
Embodiment
Fig. 2 is the logic diagram of converter embodiment mono-of the present invention, first explanation is, this converter comprises mean value determination module 10, at least two power models in parallel and set-point determination module, value of feedback determination module and the adjusters corresponding with each power model, and each power model includes power device.Should be noted that, although only show a power model A and set-point determination module 20, value of feedback determination module 30 and the adjuster 40 corresponding with this power model A in Fig. 2, but it is identical with the logical construction of set-point determination module 20, value of feedback determination module 30 and adjuster 40 that those skilled in the art will be understood that the logical construction of the set-point determination module corresponding with other power model, value of feedback determination module and adjuster.In this embodiment, mean value determination module 10 is for determining electric current or the power average value of at least two power models, for example, for determining of current average, can be by the total current of at least two power models of sampling, and determine current average according to total number of total current and power model, the mode of being for example divided by by the quantity of total current and power model is obtained average current value.For determining of power average value, can be by electric current and the voltage of each power model of sampling respectively, then calculate respectively the power of each power model, again the power of all power models is added and obtains gross power, finally the total quantity divided by power model by gross power, just can obtain power average value.Given value of current value determination module 20 is for being that power model A determines electric current or power given value according to the heat radiation information of the power device of power model A and electric current or power average value, for example, according to heat radiation situation, being respectively each power model distributes one to be greater than 0 coefficient that is less than power model quantity, and the coefficient of the power device of the power model that heat radiation situation is good is greater than the coefficient of the power device of the poor power model of heat radiation situation, the coefficient of all power models is added the quantity of power model, the electric current of power model A or power given value are that electric current or power average value are multiplied by corresponding coefficient, value of feedback determination module 30 is for the electric current of power model A or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module, adjuster 40 is for generate the control signal of corresponding power module according to the set-point of power model A and value of feedback, to realize the soaking of the power device of each power model.
The following describes this converter is how to realize power device soaking: in conjunction with Fig. 3, Fig. 3 only shows the current controlled circuit figure of power model A, but those skilled in the art will be understood that the control loop of other power model is identical with the current controlled circuit of power model A, repeat no more.And, those skilled in the art also will be understood that power control loop road and current controlled circuit similar, at this, also repeat no more.In this embodiment of the present invention, the given value of current value of a plurality of power models needs not be equal to average current value, and for example, the power device radiating condition of power model A is good, the given value of current value I of this power model A
a_refto be greater than average current value, for example, for average current, be multiplied by 1.1 coefficient.When this converter work, if the current feedback value I of this power model A
abe less than given value of current value I
a_ref,, under the adjusting of adjuster (being herein current regulator), the control signal that exports this power model A to will make the electric current of power model A increase, thereby makes current feedback value I
aall the time follow current set-point I
a_ref(i.e. the average current of 1.1 times), like this, the ability of the power device of the power model A that radiating condition is good has just been brought into play completely.On the contrary, if the heat radiation of the power device of power model A is poor, can determine its given value of current value I
a_refbe less than average current value, for example, current average is multiplied by 0.85 coefficient, after regulating by corresponding current regulator, and the current feedback value I of this power model A
aall the time follow current set-point I
a_ref(i.e. the average current of 0.85 times), has so just reduced the electric current of this power model A, thereby has reduced the heating of the power device of this poor power model that dispels the heat.Therefore, can realize by the way the soaking of the power device of each power model.
In the logic diagram of the converter embodiment bis-of the present invention shown in Fig. 4, this embodiment compares the embodiment shown in Fig. 2, difference is only, the converter of this embodiment also comprises computing module 70, and set-point determination module 20 specifically comprises: temperature sampling unit 21, thermoregulator 22 and determining unit 23.Other identical part does not repeat at this.In this embodiment, temperature sampling unit 21 is for carrying out temperature sampling to the power device of this power model A; Computing module 70, for according to the temperature sampling value of the power device of each power model, calculates the temperature sampling mean value of the power device of at least two power models; Thermoregulator 22 is for according to the temperature sampling value of the power device of power model A and temperature sampling mean value, the electric current of generating power modules A or difference power score value; Determining unit 24, for according to electric current or the difference power score value of electric current or power average value and this power model A, generates electric current or the power given value of this power model A.Similarly, for other power model, its corresponding set-point determination module also can specifically comprise corresponding temperature sampling unit, thermoregulator and determining unit, and the logical construction of temperature sampling unit, thermoregulator and determining unit is identical with the logical construction of temperature sampling unit 21, thermoregulator 22 and determining unit 23, at this, does not repeat.
Below in conjunction with Fig. 5, illustrate this converter is how to realize power device soaking: be compared to the embodiment shown in Fig. 3, difference is only, increase temperature sampling and regulated part, be specially: respectively the temperature of the power device of each power model is sampled, obtain the temperature sampling value of each power model, for example the temperature sampling value of the power device of power model A is V
atemp(voltage signal).Then, according to the temperature sampling value accounting temperature mean value V of the power device of each power model
temp, for example, after the temperature sampling value summation of the power device of all power models, then divided by the quantity of power model.For power model A, the temperature sampling value V of its power device
atempwith temperature-averaging value V
tempby thermoregulator relatively after, for adjusting the given value of current value I of this power model A
a_ref.The temperature of power device of supposing power model A is higher, illustrates that its heat radiation is poor, and thermoregulator is exported negative difference between current score value, then this negative difference between current score value and current average I
avgbe added, make the given value of current value I of this power model A
a_refvalue reduces.Under the adjusting of current regulator, the current feedback value I of this power model A
aall the time follow current set-point I
a_ref, so the electric current of this power model A also reduces, thus the temperature of its power device can be reduced.Otherwise, suppose that the temperature of power device of power model A is lower, illustrate that its radiating condition is better, thermoregulator is exported positive difference between current score value, then this positive difference between current score value and current average I
avgbe added, make the given value of current value I of this power model A
a_refvalue increases.Under the adjusting of current regulator, the current feedback value I of this power model A
aall the time follow current set-point I
a_ref, so the electric current of this power model A also increases, thus can improve the temperature of its power device, the ability of the power device of the power model A that this radiating condition is good is brought into play completely.Similarly, the electric current Principles of Regulation of other power model are also identical with the electric current Principles of Regulation of power model A.Adjusting in this way, if the temperature of the power device of certain power model is than high more of the mean value of temperature, the given value of current value of this power model is less, after regulating by current regulator, the electric current of this power model is less, the power device that the Final of the also less ， that generates heat reaches each power model consistent effect of generating heat.And, adopt temperature closed loop to control, adaptive capacity to environment is stronger, can adapt to the device soaking under various operating modes.
In another embodiment of converter of the present invention, the given value of current value of each power model also can determine by the mode of heat test, and in general, the given value of current value of the power model that radiating condition is good is large, and the given value of current value of the power model of weak heat-dissipating is little.Radiating condition difference is larger, and given value of current value difference is different also larger.
In a preferred embodiment of converter of the present invention, adjuster or thermoregulator are PID adjuster, at this, it should be noted that, when using PID adjuster, can select as required one or more in ratio adjusting, integral adjustment or differential governing loop wherein.In addition, the power model in above-described embodiment can be rectification module, inversion module, DC-DC conversion module or AC-AC conversion module, for example BoostDC-DC conversion module.Power device in above-described embodiment can be inductance, switching tube, diode etc.
Fig. 6 is the flow chart of equal heat control method embodiment mono-of the power device of converter of the present invention, and in conjunction with Fig. 2, the equal heat control method of the power device of this converter comprises:
S11. determine electric current or the power average value of at least two power models;
S12. according to the heat radiation information of the power device of corresponding power module and described electric current or power average value, be that corresponding power module is determined electric current or power given value;
S13. the electric current of corresponding power module or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module;
S14. according to the control signal of the set-point of corresponding power module and value of feedback generation corresponding power module, to realize the soaking of the power device of each power model.
In a preferred embodiment of the equal heat control method of the power device of converter of the present invention, the method that step S12 can realize by heat is determined given value of current value for each power model.
In another preferred embodiment of the equal heat control method of the power device of converter of the present invention, as shown in Figure 7, step S12 determines electric current or power given value according to step below:
S121. the power device of corresponding power module is carried out to temperature sampling;
S122. according to the temperature sampling value of the power device of each power model, calculate the temperature sampling mean value of the power device of at least two power models;
S123. according to the temperature sampling value of the power device of corresponding power module and described temperature sampling mean value, generate electric current or the difference power score value of corresponding power module;
S124. according to electric current or the difference power score value of described electric current or power average value and described corresponding power module, generate electric current or the power given value of corresponding power module.
In addition, in above-described embodiment, the regulative mode of electric current or power or thermoregulator regulative mode can be PID and regulate.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in claim scope of the present invention.
Claims (10)
1. a converter, comprises at least two power models in parallel, and described each power model comprises power device, it is characterized in that, described converter also comprises:
Mean value determination module, for determining electric current or the power average value of at least two power models;
The set-point determination module corresponding with each power model, for being that corresponding power module is determined electric current or power given value according to the heat radiation information of the power device of corresponding power module and described electric current or power average value;
The value of feedback determination module corresponding with each power model, for the electric current of corresponding power module or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module;
The adjuster corresponding with each power model, for generate the control signal of corresponding power module according to the set-point of corresponding power module and value of feedback, to realize the soaking of the power device of each power model.
2. converter according to claim 1, is characterized in that, described set-point determination module is determined electric current or power given value for the mode by heat test for each power model.
3. converter according to claim 1, is characterized in that, described set-point determination module comprises temperature sampling unit, thermoregulator and determining unit, and described converter also comprises computing module, wherein,
Described temperature sampling unit, for carrying out temperature sampling to the power device of corresponding power module;
Described computing module, for according to the temperature sampling value of the power device of each power model, calculates the temperature sampling mean value of the power device of at least two power models;
Described thermoregulator, for according to the temperature sampling value of the power device of corresponding power module and described temperature sampling mean value, generates electric current or the difference power score value of corresponding power module;
Described determining unit, for according to electric current or the difference power score value of described electric current or power average value and described corresponding power module, generates electric current or the power given value of corresponding power module.
4. converter according to claim 3, is characterized in that, described current regulator or described thermoregulator are PID adjuster.
5. converter according to claim 1, is characterized in that, described power model is rectification module, inversion module, DC-DC conversion module or AC-AC conversion module.
6. converter according to claim 1, is characterized in that, described power device is inductance, switching tube, diode.
7. an equal heat control method for the power device of converter claimed in claim 1, is characterized in that, comprising:
S11. determine electric current or the power average value of at least two power models;
S12. according to the heat radiation information of the power device of corresponding power module and described electric current or power average value, be that corresponding power module is determined electric current or power given value;
S13. the electric current of corresponding power module or power are sampled, and electric current or Feedback of Power value using sample rate current or power as corresponding power module;
S14. according to the control signal of the set-point of corresponding power module and value of feedback generation corresponding power module, to realize the soaking of the power device of each power model.
8. equal heat control method according to claim 7, is characterized in that, in described step S12, the mode by heat test is determined electric current or power given value for each power model.
9. equal heat control method according to claim 7, is characterized in that, in described step S12, according to step below, determines electric current or power given value:
The power device of corresponding power module is carried out to temperature sampling;
According to the temperature sampling value of the power device of each power model, calculate the temperature sampling mean value of the power device of at least two power models;
According to the temperature sampling value of the power device of corresponding power module and described temperature sampling mean value, generate electric current or the difference power score value of corresponding power module;
According to electric current or the difference power score value of described electric current or power average value and described corresponding power module, generate electric current or the power given value of corresponding power module.
10. equal heat control method according to claim 7, is characterized in that, in described step S14, the mode regulating by PID generates the control signal of corresponding power module.
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| CN104167785A (en) * | 2014-08-11 | 2014-11-26 | 厦门科华恒盛股份有限公司 | Photovoltaic charger control system and method based on temperature feedback |
| CN106685245A (en) * | 2015-11-10 | 2017-05-17 | 南车株洲电力机车研究所有限公司 | Multiple control method for rectifier |
| CN107005143A (en) * | 2014-11-26 | 2017-08-01 | 三菱电机株式会社 | For the Apparatus and method for for the operation of power module for controlling to be made up of switch |
| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN112448574A (en) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | DC-DC converter and control method thereof |
| WO2023035707A1 (en) * | 2021-09-07 | 2023-03-16 | 阳光电源股份有限公司 | Energy conversion system, over-temperature operation control method thereof, and control apparatus |
| WO2024045469A1 (en) * | 2022-08-29 | 2024-03-07 | 苏州元脑智能科技有限公司 | Temperature control method for power conversion chip, related assembly, and multi-phase power supply apparatus |
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| CN104167785A (en) * | 2014-08-11 | 2014-11-26 | 厦门科华恒盛股份有限公司 | Photovoltaic charger control system and method based on temperature feedback |
| CN107005143A (en) * | 2014-11-26 | 2017-08-01 | 三菱电机株式会社 | For the Apparatus and method for for the operation of power module for controlling to be made up of switch |
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| CN109672357A (en) * | 2018-12-14 | 2019-04-23 | 苏州诺威特测控科技有限公司 | A kind of bearing calibration of the more power module parallel current imbalances of single crystal growing furnace power supply |
| CN112448574A (en) * | 2019-08-30 | 2021-03-05 | 比亚迪股份有限公司 | DC-DC converter and control method thereof |
| CN112448574B (en) * | 2019-08-30 | 2022-03-18 | 比亚迪股份有限公司 | DC-DC converter and control method thereof |
| WO2023035707A1 (en) * | 2021-09-07 | 2023-03-16 | 阳光电源股份有限公司 | Energy conversion system, over-temperature operation control method thereof, and control apparatus |
| WO2024045469A1 (en) * | 2022-08-29 | 2024-03-07 | 苏州元脑智能科技有限公司 | Temperature control method for power conversion chip, related assembly, and multi-phase power supply apparatus |
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