CN112134261B - Continuous overload protection and power device cooling control method - Google Patents
Continuous overload protection and power device cooling control method Download PDFInfo
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- CN112134261B CN112134261B CN202010879011.7A CN202010879011A CN112134261B CN 112134261 B CN112134261 B CN 112134261B CN 202010879011 A CN202010879011 A CN 202010879011A CN 112134261 B CN112134261 B CN 112134261B
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- 238000001816 cooling Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000012360 testing method Methods 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000000284 resting effect Effects 0.000 claims description 4
- 238000005070 sampling Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
- H02H7/205—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment for controlled semi-conductors which are not included in a specific circuit arrangement
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Protection Of Static Devices (AREA)
Abstract
The application relates to a continuous overload protection and power device cooling control method, which relates to the technical field of device protection methods, and comprises the following steps: s1: acquiring a first temperature signal a output by a temperature sensor; s2: acquiring a protection temperature signal b, comparing the protection temperature signal b with a first temperature signal a, and executing S3 when the first temperature signal a is greater than the protection temperature signal b; s3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with preset times, executing S4 when the thermal protection times are larger than the preset times, and executing S5 when the thermal protection times are smaller than the preset times; s4: creating a timer, and executing S5 when the timing is finished; s5: and comparing the first temperature signal a output by the current temperature sensor with the protection temperature signal b, and continuously maintaining the thermal protection state when the first temperature signal a is greater than the protection temperature signal b. The application has the effect of controlling the safe and reliable operation of the temperature of the key power device of the product through single-point temperature sampling.
Description
Technical Field
The application relates to the technical field of device protection methods, in particular to a continuous overload protection and power device cooling control method.
Background
At present, under different environmental temperatures, a product is continuously overloaded and used by a heavy current load, so that heat dissipation differences at different positions of a power device are caused, heating and cooling are different, and the temperature accumulation rise and cooling time are different.
In actual production, in order to ensure the reliability of product quality, a plurality of temperature detection protection circuits are required to be added, or the specification of a power device is required to be increased.
The prior art solutions described above have the following drawbacks: the inventors believe that the cost is high due to the addition of multiple temperature sensing devices and protection circuits, or the addition of power device specifications, which typically increases the associated wiring harness and circuit devices.
Disclosure of Invention
In order to reduce the number of temperature detection devices and protection circuits arranged on a power device, the application provides a continuous overload protection and power device cooling control method.
The application provides a continuous overload protection and power device cooling control method, which adopts the following technical scheme:
a continuous overload protection and power device cooling control method comprises the following steps:
S1: acquiring a first temperature signal a output by a temperature sensor for measuring a power device;
S2: acquiring a protection temperature signal b of the power device, comparing the protection temperature signal b with a first temperature signal a, continuing to normally work when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b;
S3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with preset times, executing S4 when the thermal protection times are larger than the preset times, and executing S5 when the thermal protection times are smaller than the preset times;
s4: creating a timer, wherein the product is in a thermal protection state before the timer finishes counting, and executing S5 when the counting is finished; and
S5: and comparing the first temperature signal a output by the current temperature sensor with the protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and maintaining a thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b.
By adopting the technical scheme, only one temperature sampling point, the temperature detection device, the protection circuit, the related wire harness and the related circuit device are fewer in number, simple in circuit and low in cost; by the method, after the preset times, the product is in a cooling state within the timing time of the timer, the occurrence probability of the phenomenon that the temperature of the product is too high is reduced, and meanwhile, the reliability of the quality of the product can be improved; in the steps S4 and S5, it is necessary to simultaneously satisfy the end of the time counting period of the timer and the first temperature signal a being smaller than the protection temperature signal b, so as to enter the normal working state.
Preferably, an S0 step is further provided before the S1 step,
S0: and collecting heating temperature data of the power devices under working environments of 0 degree, 20 degrees and 40 degrees respectively, outputting a test under the maximum full load, and testing the heating condition of each power device and resting and cooling the device to a proper temperature.
By adopting the technical scheme, the heating condition of each power device and the rest and cooling of the device to the proper temperature and at least the rest and cooling time are obtained through the step S0, so that the key power device temperature of the single-point temperature sampling control product can be operated safely and reliably.
Preferably, in step S0, the power device includes a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, and a fast recovery diode.
By adopting the technical scheme, the product mainly comprises the power device.
Preferably, in the step S0, one of the power devices is selected as a key power device, and the temperature protection parameter and the cooling recovery temperature parameter of the key power device are set, so that the cooling forced rest and cooling time of other power devices is set.
By adopting the technical scheme, one power device is selected as the most critical power device, and meanwhile, the most temperature acquisition point is adopted, so that the safe and reliable operation of the critical power device temperature of the product can be controlled conveniently.
Preferably, the temperature sensor in step S1 is used to detect the current temperature of the most critical power device.
By adopting the technical scheme, the temperature sensor is used for collecting the current temperature of the most critical power device so as to judge whether the current product needs to enter a thermal protection state.
Preferably, the preset number of times in step S3 is set to 5-7 times.
By adopting the technical scheme, after entering the thermal protection state for many times, the temperature of other power devices is increased in an accumulated way, and when the power devices are used in continuous overload for a long time, the temperature exceeds the safe operation temperature of related devices, the service life and reliability of the product devices are reduced, the cooling time is prolonged after 5-7 times, and the cooling of other power devices is facilitated.
Preferably, the timing time of the timer in the step S4 is set to 2min-11min.
By adopting the technical scheme, the time of the timer is favorable for cooling other power devices, and the phenomenon of overhigh temperature is reduced.
Preferably, the first temperature signal a in the step S1 is converted into a voltage signal, the protection temperature signal b in the step S2 is set to the voltage signal, and the first temperature signal a and the protection temperature signal b in the step S2 and the step S5 are compared by a comparator.
By adopting the technical scheme, the comparator is used for comparing the first temperature signal a with the protection temperature signal b, so that the operation is simple and the implementation is easy.
Preferably, in step S3, the number of thermal protection times is added by one and accumulated by an adder.
By adopting the technical scheme, the adder is convenient for realizing the addition of one for the thermal protection times, and is simple to operate and easy to realize.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the temperature of key power devices of the product is controlled to run safely and reliably through single-point temperature sampling, and the quantity of temperature detection devices, protection circuits, related wire harnesses and circuit devices is small, the circuit is simple, and the cost is low; through the setting of the timer, the phenomenon that other power devices are higher in temperature is reduced.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to fig. 1.
The embodiment of the application discloses a continuous overload protection and power device cooling control method. Referring to fig. 1, the specific method is as follows:
S0: and respectively collecting heating temperature data of the power devices in working environments of 0 degree, 20 degrees and 40 degrees, outputting a test under the maximum full load, testing the heating condition of each power device and resting and cooling the device to a proper temperature, and obtaining the minimum value of resting and cooling time under different environments through repeated multi-round heating balance verification so as to control the safe and reliable operation of the temperature of all key power devices.
S1: a first temperature signal a is acquired for measuring the temperature sensor output of the power device.
S2: and obtaining a protection temperature signal b of the power device, comparing the protection temperature signal b with the first temperature signal a, continuing to normally work when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b.
S3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with preset times, executing S4 when the thermal protection times are larger than the preset times, and executing S5 when the thermal protection times are smaller than the preset times.
S4: creating a timer, wherein the product is always in a thermal protection state before the timer finishes, and executing S5 when the timer finishes.
S5: and comparing the first temperature signal a output by the current temperature sensor with the protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and continuously maintaining the thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b.
In step S0, the power device includes a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, and a fast recovery diode.
And in the step S0, selecting one of the power devices as the most critical power device, setting the temperature protection parameter of the most critical power device and the cooling recovery temperature parameter, and cooling other devices for at least forced rest cooling time.
Specifically, in the step S0, the product operates at the rated maximum output under the environment of 40 degrees, monitors the temperature heating condition of key components (such as a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, a fast recovery diode, etc.), sets a protection parameter of the most critical point component, detects, collects and protects the component, and determines that other key components at least protect rest and temperature reduction time value parameters under the environment of 40 degrees through a large number of data touch, so that other components without a protection point are all operated in a safe range from the next working operation period to protection. Such as: the fast recovery diode is set as the most critical point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 2 minutes and half after data is obtained, the fast recovery diode is reduced to 50 degrees, only 3-4 minutes is needed, and other devices at least have rest and temperature reduction time values for 5 minutes.
The product operates at the maximum output under the environment of 20 ℃, monitors the temperature heating condition of key components (a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, a fast recovery diode and the like), sets a protection parameter of the most critical point component, detects, collects and protects the device, determines the parameters of rest cooling time values of other key components under the environment of 20 ℃ through a large number of data touches, and ensures that other components without the protection point work in a safety range from the next working operation period to the protection. Such as: the fast recovery diode is used as the most critical point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 6 minutes after data is obtained, the fast recovery diode is reduced to 50 degrees, only 1-2 minutes is needed, and at least 3 minutes are needed for rest and temperature reduction time values of other devices.
The product operates at the maximum output under the environment of 0 ℃, monitors the temperature heating condition of key components (a switch, a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer, a fast recovery diode and the like), sets a protection parameter of the most critical point component, detects, collects and protects the device, determines the parameters of rest cooling time values of other key components under the environment of 0 ℃ through a large number of data touches, and ensures that other components without the protection point work in a safety range from the next working operation period to the protection. Such as: the fast recovery diode is used as the most critical point device, the protection temperature is 90 degrees, the recovery temperature is 50 degrees, the average working time is about 15 minutes after data is obtained, the fast recovery diode is reduced to 50 degrees, only 30-60 seconds is needed, and at least rest and temperature reduction time values of other devices are needed to be 1.5 minutes.
Experiments prove that the device can work in the environments of 0 degree, 20 degrees and 40 degrees, and can recover (50 degrees) according to the protection point parameter protection (90 degrees) and the recovery temperature parameter when in cold state work, continuously repeat 8 cycles, work-protection-recovery work-protection-restoration work-protection-restoration work-protection, the temperature of the related key components is in a safety range, when the 9 th cycle is exceeded and the continuous overload work is performed, when the rest time is shorter, the temperature of other components which are not provided with protection points can be increased in an accumulated way, and when the device is used for continuous overload for a long time, the temperature of the related components is exceeded and the service life and the reliability of the product components are reduced.
The temperature sensor in the step S1 is used for detecting the current temperature of the most critical power device.
The preset number of times in step S3 is set to 5-7 times, and this embodiment is preferably 6 times.
The timing time of the timer in step S4 is set to 2min-11min, and in this embodiment, 5min is preferred.
The first temperature signal a in the step S1 is converted into a voltage signal, the protection temperature signal b in the step S2 is set as the voltage signal, and the first temperature signal a and the protection temperature signal b in the step S2 and the step S5 are compared through a comparator; and S3, adding one heat protection frequency in the step of adding through an adder to accumulate.
The implementation principle of the continuous overload protection and power device cooling control method provided by the embodiment of the application is as follows: and under the condition of maximum full load, testing is output, the heating condition of each power device is touched, the device is cooled to a proper temperature by rest, and the rest cooling time is repeatedly verified by a plurality of rounds of heating balance to obtain safe and reliable operation of all key power devices under different environments, wherein the temperature of the key components is controlled to be within a safe range by setting a most key power device temperature protection parameter and a cooling recovery temperature parameter and cooling other devices at least for forced rest cooling time. The temperature of the key power device of the product is controlled to run safely and reliably through one temperature control sampling point. Through experiments, rated load holding rate is tested at the environmental temperatures of 40 degrees, 20 degrees and 0 degrees, 100% full load continuous operation is performed for 4 hours, and continuous overload is performed for 800 hours at the environmental temperature of 40 degrees, so that the test is passed, and the expected effect is achieved.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (5)
1. A continuous overload protection and power device cooling control method is characterized in that: the method comprises the following steps:
S1: acquiring a first temperature signal a output by a temperature sensor for measuring a power device;
S2: acquiring a protection temperature signal b of the power device, comparing the protection temperature signal b with a first temperature signal a, continuing to normally work when the first temperature signal a is smaller than the protection temperature signal b, and executing S3 when the first temperature signal a is larger than the protection temperature signal b;
S3: entering a thermal protection state, adding one to the thermal protection times, comparing the thermal protection times with preset times, executing S4 when the thermal protection times are larger than the preset times, and executing S5 when the thermal protection times are smaller than the preset times;
s4: creating a timer, wherein the product is in a thermal protection state before the timer finishes counting, and executing S5 when the counting is finished; and
S5: comparing a first temperature signal a output by a current temperature sensor with a protection temperature signal b, entering a normal working state when the first temperature signal a is smaller than the protection temperature signal b, and maintaining a thermal protection state when the first temperature signal a is larger than the protection temperature signal b until the first temperature signal a is smaller than the protection temperature signal b;
an S0 step is also provided before the S1 step,
S0: collecting heating temperature data of the power devices under working environments of 0 degree, 20 degrees and 40 degrees respectively, outputting a test under the maximum full load, and testing the heating condition of each power device and resting and cooling the device to a proper temperature;
in the S0 step, the power device comprises a rectifier bridge, an electrolytic capacitor, an IGBT, a main transformer and a fast recovery diode;
in the S0 step, selecting one of the power devices as a key power device, setting a temperature protection parameter of the key power device and a cooling recovery temperature parameter, and cooling the other power devices for forced rest and cooling time;
The temperature sensor in the step S1 is used for detecting the current temperature of the key power device.
2. The continuous overload protection and power device cooling control method as claimed in claim 1, wherein: the preset times in the step S3 are set to 5-7 times.
3. The continuous overload protection and power device cooling control method as claimed in claim 1, wherein: and S4, setting the timing time of the timer to 2-11 min.
4. The continuous overload protection and power device cooling control method as claimed in claim 1, wherein: the first temperature signal a in the S1 step is converted into a voltage signal, the protection temperature signal b in the S2 step is set to the voltage signal, and the first temperature signal a and the protection temperature signal b in the S2 step and the S5 step are compared by a comparator.
5. The continuous overload protection and power device cooling control method as claimed in claim 1, wherein: and S3, adding one heat protection frequency in the step of adding through an adder to accumulate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010879011.7A CN112134261B (en) | 2020-08-27 | 2020-08-27 | Continuous overload protection and power device cooling control method |
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| CN202010879011.7A CN112134261B (en) | 2020-08-27 | 2020-08-27 | Continuous overload protection and power device cooling control method |
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| CN112134261B true CN112134261B (en) | 2024-05-28 |
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| CN112134261A (en) | 2020-12-25 |
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