CN101710798B - Convertor - Google Patents
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- CN101710798B CN101710798B CN2009102316099A CN200910231609A CN101710798B CN 101710798 B CN101710798 B CN 101710798B CN 2009102316099 A CN2009102316099 A CN 2009102316099A CN 200910231609 A CN200910231609 A CN 200910231609A CN 101710798 B CN101710798 B CN 101710798B
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- radiator
- arithmetic unit
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Abstract
The invention relates to a converter with switching element temperature protection function. The converter comprises converting circuit, a radiator, a temperature detecting circuit, a controlling circuit, a radiator allowable temperature computing device, an overheat processing device, a current detecting circuit, a pulse-width modulation (PWM) controlling device, a carrier frequency setting device and a reference value setting device, wherein the radiator allowable temperature computing device comprises a first computing device and a second computing device. The converter is characterized in that the computing relationship of the first computing device meets the condition. The converter is capable of easily, accurately and reliably computing the allowable temperature, and realizing the overheat protection of the switching elements of a transducer without sacrificing the design redundancy, the converter also has small volume and low cost.
Description
Technical field
The present invention relates to a kind of convertor device, particularly have the convertor device of switch element temperature protection.
Background technology
Converter successfully applies in a plurality of fields, as electric machine speed regulation, and solar power generation, back-up source etc.
At present, the main switch element of converter often uses IGBT (isolated-gate field effect transistor (IGFET)) constant power device.These elements exist switching loss (loss during ON/OFF) and on-state loss, because this loss is risen the temperature of element internal, the general maximum temperature that allows of element internal is 150 ℃.Common way is to detect the temperature of radiator; come indirect reflection switch element temperature inside; compare by the temperature of detected radiator and the temperature of predefined maximum radiator permission, when meeting or exceeding this set point, switch element is protected.Be to protect effectively in some cases, for example: in a certain converter, the temperature that the maximum radiator of setting allows is 80 ℃, at galvanization is 45A, carrier wave is under the situation of 5k, and when the temperature that detects on the radiator is 80 ℃, the actual temperature of switch element inside is 120 ℃; And work as galvanization is 45A; carrier wave is under the situation of 15k; when detecting temperature on the radiator and still being 80 ℃; the actual temperature of switch element inside is already above 150 ℃; just can't protect effectively,, will strengthen radiator or add the power of big fan in order to effectively protect; to guarantee under latter event still effectively protection switch element, must cause the maximization of device and cost to improve like this.
At Chinese Granted publication number is in the patent of CN1183653C, has proposed a kind of method, and it is protected.This method and the common way main distinction are obtaining of temperature that maximum radiator allows; it is a fixed value that usual way obtains this value; what the method was obtained is the value that a real-time operation is obtained; just when this value is obtained in computing; only adopt several physical quantitys that influence the switch element temperature are summed up as the direct ratio inverse relation; though like this can be on certain degree; effectively protect; than usual way has been a lot; but there are many nonlinear relations in the switch element characteristic owing to considering; but not simple direct ratio inverse relation energy accurate description, so this method can not thoroughly address the above problem.
Summary of the invention
Task of the present invention is to solve the deficiencies in the prior art; provide a kind of volume miniaturization, cost low, under the condition of not sacrificing the design redundancy, can calculate institute's allowable temperature easily, accurately, reliably and realize overtemperature protection, can more effectively carry out overheat protector and can reasonably prevent the convertor device of converter switches component wear the switch element in the converter.
Task of the present invention is done in such a way that a kind of convertor device, provides the convertor device of alternating electromotive force to load, comprising: become the translation circuit that direct current is formed for interchange, by switch element; The radiator of installing on the above-mentioned switch element; Detect the temperature sensing circuit of above-mentioned radiator temperature; Above-mentioned switch element is carried out the control circuit of switch control; Above-mentioned switch element is carried out the radiator allowable temperature arithmetic unit of radiator computing; Control the Overheating Treatment device that above-mentioned translation circuit carries out Overheating Treatment; Detect the current detection circuit of translation circuit output current; The PWM control device; The carrier frequency setting device; The fiducial value setting device of radiator allowable temperature;
Detect radiator temperature by temperature sensing circuit, the temperature of detected radiator temperature of temperature sensing circuit and the output of radiator allowable temperature arithmetic unit is compared, when the detected radiator temperature of said temperature testing circuit reaches the temperature that the computing of above-mentioned radiator allowable temperature arithmetic unit obtains, the Overheating Treatment device is carried out the corresponding action of handling, and described radiator allowable temperature arithmetic unit comprises: the carrier frequency f of responding to switch element carrier frequency setting device
cWith go forward side by side first arithmetic unit of row operation output temperature F of the sample rate current I of response current testing circuit, respond the design temperature T of the first arithmetic unit output temperature F and the fiducial value setting device of response radiator allowable temperature
SETRow operation output temperature TH goes forward side by side
OUTSecond arithmetic unit, it is characterized in that: the operation relation of described first arithmetic unit satisfies condition
The temperature computing output relation formula of second arithmetic unit of the present invention is TH
OUT=T
SET-F.
The output valve of computing output temperature F of the present invention is according to current sample rate current I and carrier frequency f
c, obtain by data in the question blank.
Computing output temperature F of the present invention is by formula
Computing obtains, wherein said R
JsEquivalent thermal resistance for switch element inside; K
1, K
2Be switch element inside on-state loss coefficient, K
1〉=0, K
2〉=0; K
3Be switch element internal switch loss factor, K
3〉=0; C is a constant.
The present invention is owing to adopt the temperature protecting method of above-mentioned a kind of convertor device; operation method by radiator allowable temperature arithmetic unit; can calculate institute's allowable temperature easily, accurately, reliably; under the condition of not sacrificing the design redundancy, realize overtemperature protection, and DC-to-AC converter also has the advantage that volume is little, cost is low to the frequency converter switch element.
Description of drawings
Fig. 1 is converter circuit figure of the present invention.
Fig. 2 is the temperature computing protective device schematic diagram in the control circuit of the present invention.
Fig. 3 is first arithmetic unit output temperature F of radiator allowable temperature arithmetic unit and the graph of a relation of sample rate current I.
Fig. 4 is the first arithmetic unit output temperature F of radiator allowable temperature arithmetic unit and the carrier frequency f of switch element
cGraph of a relation.
Output temperature F and current detection circuit are from the graph of a relation of load input sample rate current I under the different carrier frequencies that Fig. 5 obtains for the computing of radiator allowable temperature arithmetic unit.
The microprocessor of output temperature F and control circuit obtains the carrier frequency f of switch element under the different electric currents that the computing of Fig. 6 radiator allowable temperature arithmetic unit obtains
cGraph of a relation.
Fig. 7 is a table 1 of the present invention.
Embodiment
By the description of applicant, will help to understand the present invention more, and good effect of the present invention is embodied more, but embodiment should not be considered as the restriction to some extent to technical solution of the present invention embodiment.
See also Fig. 1, the present invention provides the convertor device of alternating electromotive force for a kind of to load, comprising: become the translation circuit that direct current is formed for interchange, by switch element; The radiator of installing on the above-mentioned switch element; Detect the temperature sensing circuit of above-mentioned radiator temperature; Above-mentioned switch element is carried out the control circuit of switch control; Detect the current detection circuit of translation circuit output current.
DC power supply is by input a, b input translation circuit, dc voltage conversion is become alternating voltage, capacitor C 1 is used for filter action, wherein Q1, Q2, Q3, Q4, Q5, Q6 are the IGBT switch element, play change action, and D1, D2, D3, D4, D5, D6 are diode, for preventing interference signal, the ac output end 2c of translation circuit, 2d, 2e is connected to load.
IGBT switch element Q1, Q2, Q3, Q4, Q5, Q6 are installed on the radiator, and by heat-conducting glue, close-coupled makes the variations in temperature of the reasonable reactive switches element of variations in temperature of radiator together like this between them.On radiator, the temperature of temperature sensing circuit sampling radiator gets temperature sampling data T
SDeliver to control circuit and handle, to the temperature detection by radiator, just can reflect the situation of switch element indirectly, current detection circuit inputs to control circuit from load input sample rate current I, by control circuit switch element is carried out relevant action.
See also Fig. 2 and be the temperature computing protective device schematic diagram in the control circuit, the temperature computing protective device of described control circuit is made up of the DSP digital signal processing device.The DSP digital signal processing device is made up of the fiducial value setting device of radiator allowable temperature arithmetic unit, Overheating Treatment device, pulse-width modulation (PWM) control device, carrier frequency setting device and radiator allowable temperature, obtains the carrier frequency f of switch element by the carrier frequency setting device of DSP digital processing unit
c, the fiducial value setting device of the radiator allowable temperature by the DSP digital signal processing device obtains temperature T
SET, the first arithmetic unit response sample electric current I of radiator allowable temperature arithmetic unit and the carrier frequency f of responding to switch element
cCarry out computing output temperature F, its computing output temperature F satisfies condition
Second arithmetic unit of radiator allowable temperature arithmetic unit responds the first arithmetic unit output temperature F and the reference data value T that responds the radiator allowable temperature of setting
SETRow operation output temperature TH goes forward side by side
OUT, its computing output relation formula is TH
OUT=T
SET-F.The reference data value T of radiator allowable temperature of the present invention
SETCan set by the fiducial value setting device of radiator allowable temperature, also can be a fixed reference.
Radiator allowable temperature arithmetic unit is through the temperature T H of computing output
OUTThe temperature sampling data T that obtains with the temperature of temperature sensing circuit sampling radiator
SIn the Overheating Treatment device of DSP digital signal processing device, compare the temperature sampling data T that obtains when the temperature of said temperature testing circuit sampling radiator
SReach the temperature T H of above-mentioned radiator allowable temperature arithmetic unit computing output
OUTThe time, Overheating Treatment device output pwm control signal E=0, pwm control signal E=0 input PWM control device, the PWM control device is exported illegal state signal 0 immediately, and control switch element Q1, Q2, Q3, Q4, Q5, Q6 carry out the corresponding action of handling for closing.The temperature sampling data T that obtains when the temperature of said temperature testing circuit sampling radiator
STemperature T H less than above-mentioned radiator allowable temperature arithmetic unit computing output
OUTThe time, Overheating Treatment device output pwm control signal E=1, pwm control signal E=1 input PWM control device, the PWM control device is output as normal state signal 1 immediately, switch element Q1, Q2, Q3, Q4, Q5, Q6 operate as normal.
See also Fig. 3 and be first arithmetic unit output temperature F of radiator allowable temperature arithmetic unit and the graph of a relation of sample rate current I.Along with the increase gradually of sample rate current I, temperature F increases gradually, gets two point (F on curve
1, I
1), (F
2, I
2), 2 are satisfied relational expression
That is to say slope
The time, just can guarantee to satisfy output temperature F formula of the present invention
See also Fig. 4 and be the first arithmetic unit output temperature F of radiator allowable temperature arithmetic unit and the carrier frequency f of switch element
cGraph of a relation.Along with carrier frequency f
cIncrease gradually, temperature F increases gradually, gets two point (F on curve
1, f
C1), (F
2, f
C2), 2 are satisfied relational expression
That is to say slope
The time, just can guarantee to satisfy output temperature F formula of the present invention
See also table 1, one embodiment of the invention are example with switch element PM100RLA120, and the output valve of computing output temperature F is according to current sample rate current I and carrier frequency f
c, obtain by the data of question blank.The mode of question blank of the present invention is by inquiry ordinate f
cRound and abscissa I rounds, directly obtain.But the present invention is by first arithmetic unit output temperature F of table 1 derived graph 5 radiator allowable temperature arithmetic units and the graph of a relation of sample rate current I.Satisfy output temperature F formula of the present invention by shown in Figure 5
But the present invention is by the first arithmetic unit output temperature F of table 1 derived graph 6 radiator allowable temperature arithmetic units and the carrier frequency f of switch element
cGraph of a relation.Satisfy output temperature F formula of the present invention by shown in Figure 6
The another kind of mode of question blank of the present invention is to round and abscissa f by inquiry ordinate I
cRound, directly obtain.Question blank of the present invention have a kind of mode to inquire about to be by inquiry I and f again
cFour adjacent point values obtain after interpolation or the match.
Another embodiment of the present invention, computing output temperature F is by formula
Computing obtains.
R
JsEquivalent thermal resistance for switch element inside
I is current sample rate current
f
cBe current carrier frequency
K
1, K
2Be switch element inside on-state loss coefficient, K
1〉=0, K
2〉=0
K
3Be switch element internal switch loss factor, K
3〉=0
The C constant
K
1, K
2, K
3, R
JsConcrete value decides according to the switch element that uses, and is example with switch element PM100RLA120, and data are as follows:
K
3＝0.00071540585999999994 K
1＝0.07455 K
2＝1.12635
R
js＝0.058588235000000002 C＝29.59924589
Owing to adopt a kind of convertor device of the present invention; operation method by radiator allowable temperature arithmetic unit; can calculate radiator institute allowable temperature easily, accurately, reliably; under the condition of not sacrificing the design redundancy, realize overtemperature protection, and DC-to-AC converter also has the advantage that volume is little, cost is low to the frequency converter switch element.
Claims (4)
1. convertor device provides the convertor device of alternating electromotive force to load, comprising: become the translation circuit that direct current is formed for interchange, by switch element; The radiator of installing on the above-mentioned switch element; Detect the temperature sensing circuit of above-mentioned radiator temperature; Above-mentioned switch element is carried out the control circuit of switch control; Above-mentioned switch element is carried out the radiator allowable temperature arithmetic unit of radiator computing; Control the Overheating Treatment device that above-mentioned translation circuit carries out Overheating Treatment; Detect the current detection circuit of translation circuit output current; The PWM control device, carrier frequency setting device, the fiducial value setting device of radiator allowable temperature;
Detect radiator temperature by temperature sensing circuit, the temperature of detected radiator temperature of temperature sensing circuit and the output of radiator allowable temperature arithmetic unit is compared, when the detected radiator temperature of said temperature testing circuit reaches the temperature that the computing of above-mentioned radiator allowable temperature arithmetic unit obtains, the Overheating Treatment device is carried out the corresponding action of handling, and described radiator allowable temperature arithmetic unit comprises: the carrier frequency f of responding to switch element carrier frequency setting device
cWith go forward side by side first arithmetic unit of row operation output temperature F of the sample rate current I of response current testing circuit, respond the design temperature T of the first arithmetic unit output temperature F and the fiducial value setting device of response radiator allowable temperature
SETRow operation output temperature TH goes forward side by side
OUTSecond arithmetic unit, it is characterized in that: the operation relation of described first arithmetic unit satisfies condition
2. a kind of convertor device according to claim 1 is characterized in that the temperature computing output relation formula of described second arithmetic unit is TH
OUT=T
SET-F.
3. a kind of convertor device according to claim 1, the output valve that it is characterized in that described computing output temperature F is according to current sample rate current I and carrier frequency f
c, obtain by data in the question blank.
4. a kind of convertor device according to claim 1 is characterized in that described computing output temperature F is by formula
Computing obtains, wherein said R
JsEquivalent thermal resistance for switch element inside; K
1, K
2Be switch element inside on-state loss coefficient, K
1〉=0, K
2〉=0; K
3Be switch element internal switch loss factor, K
3〉=0; C is a constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102316099A CN101710798B (en) | 2009-12-07 | 2009-12-07 | Convertor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102316099A CN101710798B (en) | 2009-12-07 | 2009-12-07 | Convertor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101710798A CN101710798A (en) | 2010-05-19 |
| CN101710798B true CN101710798B (en) | 2011-09-07 |
Family
ID=42403560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102316099A Active CN101710798B (en) | 2009-12-07 | 2009-12-07 | Convertor |
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| Country | Link |
|---|---|
| CN (1) | CN101710798B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101997302B (en) * | 2010-08-13 | 2014-03-19 | 乌云翔 | Method for protecting electric/electronic device of high-power converter from overhigh temperature |
| CN103023280B (en) * | 2012-08-27 | 2015-04-01 | 常熟开关制造有限公司(原常熟开关厂） | Heat memory method after power failure of converter with heat radiator |
| CN103699152B (en) * | 2013-11-28 | 2015-12-02 | 中冶南方（武汉）自动化有限公司 | A kind of power device excess temperature protection method based on temperature curve slop control |
| CN110581534B (en) * | 2018-06-11 | 2021-08-03 | 台达电子工业股份有限公司 | Temperature protection circuit |
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2009
- 2009-12-07 CN CN2009102316099A patent/CN101710798B/en active Active
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| Publication number | Publication date |
|---|---|
| CN101710798A (en) | 2010-05-19 |
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