CN114759522A - Over-temperature protection method and device for air-cooled power supply and power supply - Google Patents
Over-temperature protection method and device for air-cooled power supply and power supply Download PDFInfo
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- CN114759522A CN114759522A CN202210671219.9A CN202210671219A CN114759522A CN 114759522 A CN114759522 A CN 114759522A CN 202210671219 A CN202210671219 A CN 202210671219A CN 114759522 A CN114759522 A CN 114759522A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/042—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using temperature dependent resistors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/046—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a thermocouple
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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
- H02M1/00—Details of apparatus for conversion
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The embodiment of the invention discloses an over-temperature protection method and device for an air-cooled power supply and the power supply. The method comprises the following steps: collecting a first sampling temperature and a second sampling temperature; calculating a temperature difference between the first sampling temperature and the second sampling temperature; judging whether the temperature difference value is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; when the first sampling temperature is greater than a first protection threshold value or the second sampling temperature is greater than a second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection. Through the mode, the equipment material cost added by the embodiment of the invention is low, the blockage abnormity of the air inlet can be effectively detected, and other normal working conditions can not be influenced.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to an over-temperature protection method and device for an air-cooled power supply and the power supply.
Background
With the development of new capital construction, 5G base stations, IDC data centers, new energy vehicles and the like are increased explosively, and accordingly, the demand for medium-high power supply equipment is increased day by day. The power supply device adopting the fan forced convection mode for heat dissipation is widely applied to the power supply module and the system due to the advantages of low cost, excellent heat dissipation effect and the like.
The power supply needs to suck outside environment air into the power supply, and the IP protection level is low. In the long-term operation process, the air inlet is blocked by dust accumulation or foreign matters, so that the air quantity of the air inlet is reduced, the air pressure is reduced, the heat dissipation effect is greatly weakened, and the temperature of a heating device in the power supply is rapidly increased. And because thermal resistance and heat transfer time lag exist between the heating device and the temperature detection element, the temperature detection element cannot track the actual temperature of the heating device in real time, over-temperature protection is not reported, the heating device is damaged because the temperature of the heating device exceeds the self-tolerance temperature, and the power failure even serious accidents of a system level are caused.
The existing counter measures are mainly to adjust the protection threshold value of the original temperature detection device in the equipment or to add a special sensor for detecting the wind pressure of the air inlet. The former easily causes the power supply equipment to be triggered by mistake under the extreme normal working condition, and even the working condition can not be considered completely; the latter adds significant cost but produces little benefit.
Disclosure of Invention
In order to solve the technical problem, one technical scheme adopted by the embodiment of the invention is as follows: the over-temperature protection method for the air-cooled power supply comprises the following steps: acquiring a first sampling temperature and a second sampling temperature at two ends of a radiator, wherein the first sampling temperature is acquired at an air outlet end of the radiator, and the second sampling temperature is acquired at an air inlet end of the radiator; calculating a temperature difference between the first sampled temperature and the second sampled temperature, the temperature difference being obtained by subtracting the second sampled temperature from the first sampled temperature; judging whether the temperature difference value is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; when the first sampling temperature is greater than the first protection threshold value or the second sampling temperature is greater than the second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply; and when the first sampling temperature is not greater than the first protection threshold and the second sampling temperature is not greater than the second protection threshold, not triggering over-temperature protection.
In some embodiments, not triggering over-temperature protection further comprises: when the first sampling temperature is between a first warning threshold and a first protection threshold, or the second sampling temperature is between a second warning threshold and a second protection threshold, triggering an over-temperature warning to control the derating operation of the air-cooled power supply; wherein the first warning threshold is less than the first protection threshold and the second warning threshold is less than the second protection threshold; and when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold, the air-cooled power supply is kept to normally work.
In some embodiments, the relative protection threshold is set based on a temperature difference between the first sampled temperature and the second sampled temperature of the air-cooled power supply at different output powers, at different fan speeds, and at different ambient temperatures.
In some embodiments, the relative protection thresholds are stored in the form of a function, either as a data table or by numerical fitting.
In some embodiments, the relative protection threshold is obtained from the data table according to the current output power, the rotating speed and the ambient temperature of the air-cooled power supply; or according to the current output power, the rotating speed and the environmental temperature of the air-cooled power supply, the function is calculated.
In some embodiments, said controlling said air-cooled power supply derating operation comprises: and reducing the maximum output power limit value of the air-cooled power supply or/and increasing the rotating speed of a fan of the air-cooled power supply.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: provided is an over-temperature protection device of an air-cooled power supply, including: the temperature acquisition module is used for acquiring a first sampling temperature and a second sampling temperature at two ends of the radiator; a temperature difference calculation module for calculating a temperature difference between the first sampling temperature and the second sampling temperature, wherein the temperature difference is obtained by subtracting the second sampling temperature from the first sampling temperature; the first judgment module is used for judging whether the difference value between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; the over-temperature protection module is used for triggering over-temperature protection and closing the air-cooled power supply when the first sampling temperature is greater than the first protection threshold or the second sampling temperature is greater than the second protection threshold; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
In some embodiments, the above apparatus further comprises: the derating operation module is used for triggering an over-temperature warning and controlling the derating operation of the air-cooled power supply when the first sampling temperature is between a first warning threshold and a first protection threshold or the second sampling temperature is between a second warning threshold and a second protection threshold; and the normal operation module is used for keeping the air-cooled power supply to normally work when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: provided is an air-cooled power supply with over-temperature protection, including: the temperature control system comprises a power supply unit, a temperature acquisition unit, a cooling unit and a control unit, wherein the power supply unit is respectively connected to the temperature acquisition unit, the control unit and the cooling unit and is used for supplying power to the temperature acquisition unit, the control unit and the cooling unit; the cooling unit comprises a fan and a radiator, the cooling unit is used for cooling the air-cooled power supply, and the radiator is parallel to air duct airflow formed by the fan; the temperature acquisition unit comprises a first temperature detection device and a second temperature detection device, wherein the first temperature detection device and the second temperature detection device are respectively used for detecting a first sampling temperature and a second sampling temperature of the radiator, and the first temperature detection device is arranged at an air outlet end of the radiator; the second temperature detection device is arranged at the air inlet end of the radiator; the control unit is used for judging whether the difference value between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; when the first sampling temperature is greater than the first protection threshold value or the second sampling temperature is greater than the second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
In some embodiments, the control unit is further configured to trigger an over-temperature warning and control the air-cooled power supply to derate when the over-temperature protection is not triggered and the first sampling temperature is between a first warning threshold and the first protection threshold, or the second sampling temperature is between a second warning threshold and the second protection threshold; and when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold, the air-cooled power supply is kept to normally work.
The beneficial effects of the embodiment of the invention are as follows: different from the situation of the prior art, the method and the device have the advantages that the material cost of the added equipment is low, the blockage abnormity of the air inlet can be effectively detected, and other normal working conditions cannot be influenced.
Drawings
Fig. 1 is a schematic flow chart of an over-temperature protection method for an air-cooled power supply according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another over-temperature protection method for an air-cooled power supply according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an over-temperature protection device for an air-cooled power supply according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an alternative over-temperature protection device for an air-cooled power supply according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an air-cooled power supply with over-temperature protection according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a temperature detecting unit according to an embodiment of the present invention;
fig. 7 is a hardware configuration diagram of a temperature detection unit according to an embodiment of the present invention;
FIG. 8 is a graph showing an isotherm distribution under normal wind pressure using a temperature detection unit provided in the embodiment of FIG. 7;
FIG. 9 is a distribution diagram of isotherms under a small wind pressure using a temperature detection unit provided in the embodiment of FIG. 7;
FIG. 10 is a hardware block diagram of an air-cooled power supply with over-temperature protection according to an embodiment of the present invention;
FIG. 11 is a graph showing the temperature and temperature difference of the first temperature detecting unit when the air-cooled power supply with over-temperature protection provided by the embodiment of FIG. 10 is applied;
fig. 12 is a graph showing the sampling temperature and temperature difference of the second temperature detection unit in the case of applying the air-cooled power supply with over-temperature protection provided by the embodiment of fig. 10.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
Referring to fig. 1, fig. 1 is a schematic flow chart of an over-temperature protection method for an air-cooled power supply according to an embodiment of the present invention, where the method includes the following steps:
step S100: collecting a first sampling temperature and a second sampling temperature;
specifically, the temperature across the heat sink is collected. In some embodiments, the temperature collected at the air outlet end of the heat sink is taken as a first sampling temperature, and the temperature collected at the air inlet end of the heat sink is taken as a second sampling temperature along the air duct.
It should be noted that, because the air inlet end is closer to the air inlet, the first sampling temperature is higher than the second sampling temperature under the condition that the air-cooled power supply normally works, and the first sampling temperature and the second sampling temperature show relatively fixed differences under the condition of specific power output power and fan rotating speed.
Step S200: calculating a temperature difference between the first sampling temperature and the second sampling temperature;
In some embodiments, the temperature difference is the first sampled temperature minus the second sampled temperature.
Step S300: judging whether the temperature difference value is smaller than a preset relative protection threshold value or not;
it should be noted that, the relative protection threshold is set by adding a certain margin according to the difference between the first sampling temperature and the second sampling temperature of the air-cooled power supply at different output powers, different fan speeds and different ambient temperatures, and is stored in a data table or in a functional form through numerical fitting.
Before the judgment, a relative protection threshold value is obtained in advance. The modes of acquiring the relative protection threshold in advance are divided into the following two modes: firstly, acquiring from a pre-stored data table according to the current output power, the rotating speed and the ambient temperature of the air-cooled power supply; and secondly, calculating according to the current output power, the rotating speed and the environmental temperature of the air-cooled power supply through a pre-stored function.
Specifically, after the relative protection threshold is obtained, whether the temperature difference value is smaller than a preset relative protection threshold is judged, and if yes, step S310 is executed; if not, go to step S320.
Step S310: triggering over-temperature protection and closing the air-cooled power supply;
specifically, over-temperature protection is triggered, which represents that the air-cooled power supply stops working to prevent the air-cooled power supply from being over-heated.
Step S320: respectively judging whether the first sampling temperature is greater than a first protection threshold value and whether the second sampling temperature is greater than a second protection threshold value;
when the temperature difference value is judged to be not smaller than the preset relative protection threshold value, whether the first sampling temperature is larger than the first protection threshold value or whether the second sampling temperature is larger than the second protection threshold value is judged; if yes, go to step S310; if not, go to step S322.
In some embodiments, the first protection threshold and the second protection threshold are obtained by sampling the highest temperature value and adding a certain margin when the air-cooled power supply is applied to all working conditions.
Step S322: no over-temperature protection is triggered;
and when the first sampling temperature is judged to be not more than the first protection threshold value and the second sampling temperature is judged to be not more than the second protection threshold value, the over-temperature protection is not triggered, and the air-cooled power supply normally operates.
Referring to fig. 2, fig. 2 is a schematic flow chart of another over-temperature protection method for an air-cooled power supply according to an embodiment of the present invention, where the method includes the following steps:
step S100: collecting a first sampling temperature and a second sampling temperature;
specifically, the temperature at both ends of the heat sink is collected. In some embodiments, the temperature collected at the air outlet end of the heat sink is taken as a first sampling temperature, and the temperature collected at the air inlet end of the heat sink is taken as a second sampling temperature along the air duct.
It should be noted that, because the air inlet end is closer to the air inlet, the first sampling temperature is higher than the second sampling temperature under the condition that the air-cooled power supply normally works, and the first sampling temperature and the second sampling temperature show relatively fixed differences under the condition of specific power output power and fan rotating speed.
Step S200: calculating a temperature difference between the first sampling temperature and the second sampling temperature;
step S300: judging whether the temperature difference value is smaller than a preset relative protection threshold value or not;
it should be noted that, the relative protection threshold is set by adding a certain margin according to the difference between the first sampling temperature and the second sampling temperature of the air-cooled power supply at different output powers, different fan speeds and different ambient temperatures, and is stored in a data table or in a functional form through numerical fitting.
Before the judgment, a relative protection threshold value is acquired in advance. The modes of acquiring the relative protection threshold in advance are divided into the following two modes: firstly, acquiring from a pre-stored data table according to the current output power, the rotating speed and the ambient temperature of the air-cooled power supply; and secondly, calculating according to the current output power, the rotating speed and the environmental temperature of the air-cooled power supply through a pre-stored function.
Specifically, after the relative protection threshold is obtained, whether the temperature difference value is smaller than a preset relative protection threshold is judged, and if yes, step S310 is executed; if not, go to step S320.
Step S310: triggering over-temperature protection and closing the air-cooled power supply;
specifically, over-temperature protection is triggered, which manifests as turning off the air-cooled power supply to prevent the air-cooled power supply from being over-heated.
Step S320: respectively judging whether the first sampling temperature is greater than a first warning threshold value and whether the second sampling temperature is greater than a second warning threshold value;
when the temperature difference is judged to be not smaller than the preset relative protection threshold, judging whether the first sampling temperature is larger than a first warning threshold or whether the second sampling temperature is larger than a second warning threshold; if yes, go to step S321; if not, go to step S322.
In some embodiments, the first warning threshold and the second warning threshold are obtained by sampling the highest temperature value and adding a certain margin when the air-cooled power supply is applied to all operating conditions.
Step S322: no over-temperature protection is triggered;
when the first sampling temperature is judged to be not more than the first warning threshold value and the second sampling temperature is judged to be not more than the second warning threshold value, the over-temperature protection is not triggered, and the air-cooled power supply normally operates;
Step S321: respectively judging whether the first sampling temperature is greater than a first protection threshold value and whether the second sampling temperature is greater than a second protection threshold value;
judging whether the first sampling temperature is greater than a first protection threshold or whether the second sampling temperature is greater than a second protection threshold, if so, executing a step S310; if not, executing step S400;
it should be noted that the first protection threshold and the second protection threshold are respectively greater than the first warning threshold and the second warning threshold.
Step S400: controlling the derating operation of the air-cooled power supply;
in some embodiments, controlling derated operation of the air-cooled power supply includes reducing a maximum output power limit of the air-cooled power supply or/and increasing a speed of a fan of the air-cooled power supply;
specifically, when the first sampled temperature is at a first warning threshold and a first holdBetween guard thresholds or between a second warning threshold and said second guard threshold, according to a guard threshold
(including the first protection temperature or the second protection temperature) and a warning threshold
And (including the first warning temperature or the second warning temperature) so that the maximum output power is reduced by N% and the rotating speed of the fan is increased by M revolutions at the unit temperature.
Wherein, M is greater than or equal to 0 (when M =0, it is stated that the rotating speed of the air-cooled power supply fan is not increased), and the maximum output power reduction proportion N% meets the following conditions:
if the warning threshold (here, the first warning temperature is equal to the second warning temperature) is 80 ℃, and the protection threshold (here, the first protection temperature is equal to the second protection temperature) is 100 ℃, N ranges from 0 to 5 (when N =0, the maximum output power limit of the air-cooled power supply is not reduced), N =2.5 and M =100 may be adopted.
The following is an example case in which the above-described over-temperature protection method is applied:
the first condition is as follows: the first sampling temperature and the second sampling temperature are 85 ℃ and 70 ℃, respectively, and correspond to:
at this time, the second temperature warning threshold is not triggered, and step S322 is executed, wherein the air-cooled power supply normally operates;
if the first temperature warning threshold is triggered but the protection threshold is not triggered, step S400 is executed, and the power limit is set to 87.5% of the maximum output power (i.e. the maximum output power is derated by 12.5%), and the rotation speed is increased by 500 revolutions;
if the two results are more serious, the power limit value is set to 87.5% of the maximum output power (i.e. the maximum output power is decreased by 12.5%), and the rotation speed is increased by 500 revolutions under the normal working condition.
Case two: the first sampling temperature and the second sampling temperature are respectively 95 ℃ and 85 ℃, and correspond to:
At this time, the first temperature warning threshold is triggered but the protection threshold is not triggered, and step S400 is executed, where the power limit is set to 62.5% of the maximum output power (i.e. 37.5% of the maximum output power derating), and the rotation speed is increased by 1500 rpm;
when the second temperature warning threshold is triggered but the protection threshold is not triggered, step S400 is executed, and the power limit value is set to 87.5% of the maximum output power (i.e. the maximum output power is de-rated by 12.5%), and the rotation speed is increased by 500 rpm;
if the two results are more serious, the power limit value is set to be 62.5% of the maximum output power (namely, the maximum output power is reduced by 37.5%), and the rotating speed is increased by 1500 revolutions under the normal operating condition.
And a third situation: the first sampling temperature and the second sampling temperature are respectively 100 ℃ and 85 ℃, and correspond to:
at the moment, a first temperature warning threshold is triggered and a protection threshold is triggered, and step S310 is executed to stop the air-cooled power supply;
when the second temperature warning threshold is triggered but the protection threshold is not triggered, step S400 is executed, and the power limit value is set to 87.5% of the maximum output power (i.e. the maximum output power is de-rated by 12.5%), and the rotation speed is increased by 500 rpm;
if the two results are more serious, the air-cooled power supply is stopped.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an over-temperature protection device for an air-cooled power supply according to an embodiment of the present invention, where the device includes: the temperature acquisition module 110 is used for acquiring a first sampling temperature and a second sampling temperature at two ends of the radiator;
a temperature difference calculation module 120 for calculating a temperature difference between the first sampling temperature and the second sampling temperature;
a first determining module 130, configured to determine whether a difference between the second sampling temperature and the first sampling temperature is smaller than a preset relative protection threshold; if so, judging whether the first sampling temperature is greater than the first protection threshold value or not and whether the second sampling temperature is greater than the second protection threshold value or not;
the over-temperature protection module 140 is configured to trigger over-temperature protection and turn off the air-cooled power supply when the first sampling temperature is greater than a first protection threshold or the second sampling temperature is greater than a second protection threshold; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another over-temperature protection device for an air-cooled power supply according to an embodiment of the present invention, where the device includes: the temperature acquisition module 110 is used for acquiring a first sampling temperature and a second sampling temperature at two ends of the radiator;
A temperature difference calculation module 120 for calculating a temperature difference between the first sampling temperature and the second sampling temperature;
in some embodiments, the temperature difference is the first sampled temperature minus the second sampled temperature.
A first determining module 130, configured to determine whether a difference between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not;
the over-temperature protection module 140 is configured to trigger over-temperature protection and turn off the air-cooled power supply when the first sampling temperature is greater than a first protection threshold or the second sampling temperature is greater than a second protection threshold; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
The derating operation module 150 is used for controlling the derating operation of the air-cooled power supply when the first sampling temperature is between a first warning threshold and a first protection threshold or the second sampling temperature is between a second warning threshold and a second protection threshold;
And the normal operation module 160 is used for keeping the air-cooled power supply working normally when the first sampling temperature is not greater than the first protection threshold value or the second sampling temperature is not greater than the second protection threshold value.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an air-cooled power supply with over-temperature protection according to an embodiment of the present invention, where the air-cooled power supply includes a power supply unit 300, a temperature acquisition unit 500, a temperature reduction unit 600 and a control unit 400,
the power supply unit 300 is respectively connected to the temperature acquisition unit 500, the control unit 400 and the cooling unit 600, and the power supply unit 300 is used for supplying power to the temperature acquisition unit 500, the control unit 400 and the cooling unit 600;
the temperature reduction unit 600 comprises a fan 602 and a radiator 601, wherein the temperature reduction unit 600 is used for reducing the temperature of the air-cooled power supply, and the radiator is parallel to air duct airflow formed by the fan 602;
the temperature acquisition unit 500 comprises a first temperature detection device 501 and a second temperature detection device 502, wherein the first temperature detection device 501 and the second temperature detection device 502 are respectively used for detecting a first sampling temperature and a second sampling temperature of the radiator 601, and the first temperature detection device 501 is arranged at an air outlet end of the radiator 601; the second temperature detection device 502 is arranged at the air inlet end of the radiator 601;
In some embodiments, the first temperature detection device 501 and the second temperature detection device 502 may use an NTC (negative temperature coefficient thermistor), a PTC (positive temperature coefficient thermistor), or a thermocouple or other temperature detection device.
The control unit 400 is configured to determine whether a difference between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; and when the first sampling temperature is greater than the first protection threshold value or the second sampling temperature is greater than the second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply.
The control unit 400 is further configured to control derating operation of the air-cooled power supply when the first sampling temperature is between a first warning threshold and a first protection threshold, or the second sampling temperature is between a second warning threshold and a second protection threshold; and when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold, the normal work of the air-cooled power supply is kept.
Through the mode, the equipment material cost added by the embodiment of the invention is low, the blockage abnormity of the air inlet can be effectively detected, and other normal working conditions can not be influenced.
Referring to fig. 6 and 6, which are schematic structural views of a temperature detecting unit according to an embodiment of the present invention, a heating device 102, such as a power semiconductor, in an air-cooled power supply is generally mounted on a heat sink 101 in various forms, and the heat sink 101 is parallel to an airflow direction of an air duct formed by a fan, so as to take out heat. In the conventional technology, only one temperature detection device 103 is usually installed on the heat sink 1, and in the present case, one temperature detection device 103 is respectively disposed at the head end and the tail end of the heat sink for detecting the temperature of the position where the temperature detection device is located.
In some embodiments, the temperature detection device 1 is placed at the air outlet end of the heat radiator, that is, at the air outlet end of the heat radiation air duct formed along the airflow direction; the temperature detection device 2 is placed at the air inlet end of the radiator, namely at one end of an air inlet of a heat dissipation air duct formed along the airflow direction.
Because the temperature detection device 1 is closer to the air outlet, in general, a first sampling temperature obtained by sampling by the temperature detection device 1 is higher than a second sampling temperature obtained by sampling by the temperature detection device 2, and relatively fixed difference is presented under the conditions of specific power output power and specific fan rotating speed.
When the air inlet is blocked by foreign matters, the air inlet volume is reduced, the forced convection effect is weakened, the heat free diffusion effect of the heating devices 1-n is relatively enhanced, the temperature rising speed of the temperature detection device 2 is larger than that of the temperature detection device 1, and the difference value between the first sampling temperature and the second sampling temperature is reduced. By utilizing the characteristic, the over-temperature protection caused by abnormal blockage of the air inlet can be triggered when the temperature difference is smaller than a certain value by adding the over-temperature protection caused by over-temperature of the traditional absolute temperature value.
Referring TO fig. 7, fig. 7 is a hardware structure diagram of a temperature detecting unit according TO an embodiment of the invention, which employs an NTC (negative temperature coefficient thermistor) as a sensing element for temperature detection TO detect a TO-247 packaged semiconductor switching device. The air inlet is arranged on the right side of the radiator, and the air flow direction flows from the right side of the radiator to the left side of the radiator.
Fig. 8 is a distribution diagram of isotherms under normal wind pressure using a temperature detection unit provided in the embodiment of fig. 7, and it can be seen from the diagram that the temperature difference interval of the isotherms is 1 ℃. Due to the forced convection heat dissipation effect of air, NTC sampling points on the left and right sides are respectively on isotherms of the 6 th and 19 th levels in the figure, and the temperature difference is about 13 ℃.
Fig. 9 is a distribution diagram of isotherms under small wind pressure using a temperature detection unit provided in the embodiment of fig. 7, and it can be seen from the diagram that the temperature difference interval of the isotherms is 1 ℃. Because the forced convection heat dissipation effect of air is greatly weakened, NTC sampling points on the left side and the right side are respectively on isothermal lines of a 9 th level and a 15 th level in the figure, and the temperature difference is only about 6 ℃.
By setting the relative protection threshold value to be about 10 ℃ under the working condition, the abnormal wind pressure of the air inlet can be timely detected and a protection action can be performed on the premise of not triggering by mistake.
Referring to fig. 10, fig. 10 is a hardware structure diagram of an air-cooled power supply with over-temperature protection according to an embodiment of the present invention, two fan modules 602 are disposed on the right side of the power supply circuit, and airflow in an air duct flows from right to left, and the first temperature detection unit 701 and the second temperature detection unit 702 are both configured as shown in fig. 7, and detect abnormal wind blockage of the two fans and the temperatures of the semiconductor devices on the corresponding radiators respectively.
At this time, the ambient temperature is 5 ℃, the power supply is in a full power operation state, and the two NTC sampling temperatures and the difference Δ T thereof in the first temperature detecting unit 701 and the second temperature detecting unit 702 are shown in fig. 11 and 12. The relative protection threshold set under this condition is 2 ℃, the first warning threshold and the second warning threshold are both 95 ℃, and the first protection threshold and the second protection threshold are both 105 ℃.
In a normal operation state, the sampling temperatures of two temperature detection devices in the first temperature detection unit 701 are respectively 21.1 ℃ and 28.4 ℃, and the temperature difference value is 7.3 ℃; the sampling temperatures of the two temperature detection devices in the first temperature detection unit 701 are respectively 20.2 ℃ and 26.7 ℃, the temperature difference is 6.5 ℃, and the protection is not triggered.
The 128 th s is started to block the air inlet of the power supply fan due to foreign matters, and the temperature of devices in the power supply circuit is increased.
At the 184s point, the sampling temperatures of the two temperature detection devices in the first temperature detection unit 701 are respectively 48.1 ℃ and 50.0 ℃, the temperature difference is 1.9 ℃, the air plugging/over-temperature protection is triggered, and the power supply device is shut down.
At the 184s, the sampling temperatures of the two temperature detection devices in the second temperature detection unit 702 are 55.9 ℃ and 53.4 ℃ respectively, the temperature difference is 2.5 ℃, and no protection is triggered. If the first temperature detecting unit 701 does not trigger protection, the sampling temperatures of the two temperature detecting devices in the second temperature detecting unit 702 continuously rise, and reach 57.3 ℃ and 55.4 ℃ respectively at 186s, and the temperature difference is 1.9 ℃, so that wind blockage/over-temperature protection can be triggered to shut down the power supply device.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An over-temperature protection method of an air-cooled power supply is characterized by comprising the following steps:
acquiring a first sampling temperature and a second sampling temperature at two ends of a radiator, wherein the first sampling temperature is acquired at an air outlet end of the radiator, and the second sampling temperature is acquired at an air inlet end of the radiator;
calculating a temperature difference between the first sampled temperature and the second sampled temperature, the temperature difference being obtained by subtracting the second sampled temperature from the first sampled temperature;
judging whether the temperature difference value is smaller than a preset relative protection threshold value or not;
if yes, triggering over-temperature protection and closing the air-cooled power supply;
if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not;
when the first sampling temperature is greater than the first protection threshold value or the second sampling temperature is greater than the second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply;
and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
2. The method of claim 1, wherein not triggering over-temperature protection comprises:
when the first sampling temperature is between a first warning threshold and a first protection threshold, or the second sampling temperature is between a second warning threshold and a second protection threshold, triggering an over-temperature warning to control the air-cooled power supply to operate in a derating mode;
wherein the first warning threshold is less than the first protection threshold and the second warning threshold is less than the second protection threshold;
and when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold, the air-cooled power supply is kept to normally work.
3. The method of claim 1, wherein the relative protection threshold is set based on a temperature difference between the first sampled temperature and the second sampled temperature of the air-cooled power supply at different output powers, at different fan speeds, and at different ambient temperatures.
4. The method according to claim 3, characterized in that the relative protection threshold is stored in the form of a function, either in a data table or by numerical fitting.
5. The method of claim 4, wherein the relative protection threshold is obtained from the data table based on the current output power, rotational speed, and ambient temperature of the air-cooled power supply;
Or according to the current output power, the rotating speed and the ambient temperature of the air-cooled power supply, calculating through the function.
6. The method of claim 2, wherein the controlling the air-cooled power supply to derate comprises:
and reducing the maximum output power limit value of the air-cooled power supply or/and increasing the rotating speed of a fan of the air-cooled power supply.
7. An over-temperature protection device for an air-cooled power supply, comprising:
the temperature acquisition module is used for acquiring a first sampling temperature and a second sampling temperature at two ends of the radiator;
the temperature difference calculation module is used for calculating a temperature difference value between the first sampling temperature and the second sampling temperature, and the temperature difference value is obtained by subtracting the second sampling temperature from the first sampling temperature;
the first judgment module is used for judging whether the difference value between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not;
The over-temperature protection module is used for triggering over-temperature protection and closing the air-cooled power supply when the first sampling temperature is greater than the first protection threshold or the second sampling temperature is greater than the second protection threshold; and when the first sampling temperature is not greater than the first protection threshold and the second sampling temperature is not greater than the second protection threshold, not triggering over-temperature protection.
8. The apparatus of claim 7, further comprising:
the derating operation module is used for triggering an over-temperature warning and controlling the derating operation of the air-cooled power supply when the first sampling temperature is between a first warning threshold and a first protection threshold or the second sampling temperature is between a second warning threshold and a second protection threshold;
and the normal operation module is used for keeping the air-cooled power supply to normally work when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold.
9. An air-cooled power supply with over-temperature protection, comprising: a power supply unit, a temperature acquisition unit, a cooling unit and a control unit, wherein,
The power supply unit is respectively connected to the temperature acquisition unit, the control unit and the cooling unit and is used for supplying power to the temperature acquisition unit, the control unit and the cooling unit;
the cooling unit comprises a fan and a radiator, the cooling unit is used for cooling the air-cooled power supply, and the radiator is parallel to air duct airflow formed by the fan;
the temperature acquisition unit comprises a first temperature detection device and a second temperature detection device, wherein the first temperature detection device and the second temperature detection device are respectively used for detecting a first sampling temperature and a second sampling temperature of the radiator, and the first temperature detection device is arranged at an air outlet end of the radiator; the second temperature detection device is arranged at the air inlet end of the radiator;
the control unit is used for judging whether the difference value between the first sampling temperature and the second sampling temperature is smaller than a preset relative protection threshold value or not; if yes, triggering over-temperature protection and closing the air-cooled power supply; if not, judging whether the first sampling temperature is greater than a first protection threshold value or not and whether the second sampling temperature is greater than a second protection threshold value or not; when the first sampling temperature is greater than the first protection threshold value or the second sampling temperature is greater than the second protection threshold value, triggering over-temperature protection and closing the air-cooled power supply; and when the first sampling temperature is not greater than the first protection threshold value and the second sampling temperature is not greater than the second protection threshold value, not triggering over-temperature protection.
10. The air-cooled power supply according to claim 9, wherein the control unit is further configured to trigger an over-temperature warning to control derating operation of the air-cooled power supply when the first sampled temperature is between a first warning threshold and the first protection threshold or the second sampled temperature is between a second warning threshold and the second protection threshold when the over-temperature protection is not triggered;
and when the first sampling temperature is not greater than the first warning threshold and the second sampling temperature is not greater than the second warning threshold, the air-cooled power supply is kept to normally work.
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