CN112350584B - Heat dissipation control device and method for power device and electrical equipment - Google Patents
Heat dissipation control device and method for power device and electrical equipment Download PDFInfo
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- CN112350584B CN112350584B CN202010980952.XA CN202010980952A CN112350584B CN 112350584 B CN112350584 B CN 112350584B CN 202010980952 A CN202010980952 A CN 202010980952A CN 112350584 B CN112350584 B CN 112350584B
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003111 delayed effect Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 73
- 230000005855 radiation Effects 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims 3
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
- H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
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Abstract
The invention discloses a heat dissipation control device and method of a power device and electrical equipment, wherein the device comprises: under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in a disconnected state; the control panel of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range; after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit; and under the condition that the power device is stopped and the heat dissipation unit is closed after the heat dissipation unit is operated for a set time in a delayed mode, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device. According to the scheme, the temperature rise inside the frequency converter can be timely dissipated, and therefore the service life of components is prolonged.
Description
Technical Field
The invention belongs to the technical field of heat dissipation of electronic devices, and particularly relates to a heat dissipation control device and method of a power device and electrical equipment, in particular to a heat dissipation device and method of a power device (such as a high-power frequency converter like a frequency converter cabinet, an electric cabinet and a load box) and electrical equipment (such as electrical equipment with the power device).
Background
Under the situation of continuous progress and development of electronic technology, the development of frequency converter technology and its equipment is also gradually perfected and has been widely used, for example: heavy industry, water supply construction systems, air conditioning equipment, elevator operation, etc. Along with the technology of high-power converter is perfect gradually, on its basis forward the modularization, small, the direction development that the integrated level is high, because small reason also, the temperature rise that can appear converter inside can't be dispelled to influence the life of components and parts inevitably.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a heat dissipation control device and method for a power device and electrical equipment, so as to solve the problem that the service life of components is affected if the temperature rise inside a frequency converter is not timely dissipated, and achieve the effect of timely dissipating the temperature rise inside the frequency converter, thereby prolonging the service life of the components.
The invention provides a heat dissipation control device of a power device, comprising: the temperature control unit, the switch unit and the heat dissipation unit; the temperature control unit includes: the temperature control system comprises a first temperature control module and a second temperature control module; the switch unit and the first temperature control module are arranged between a control board of the power device and an alternating current power supply; the control board of the power device is connected to the heat dissipation unit; the connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module; under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in an off state; the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range; after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit; and under the condition that the power device is stopped and the heat dissipation unit is closed after the time delay operation is carried out for a set time, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device.
In some embodiments, the switching unit includes: a first relay; the first temperature control module includes: a first temperature controller; the second temperature control module includes: a second temperature controller; the heat dissipation unit includes: a heat radiation fan; the normally closed contact of the first relay is connected between the first end of the control board of the power device and the first end of the alternating current power supply; the second end of the control board of the power device is connected to the second end of the alternating current power supply; the second end of the control panel of the power device is connected to the first end of the alternating current power supply after passing through the coil of the first relay, the first temperature controller and the normally open contact of the first relay; the third end of the control board of the power device is connected to the first end of the cooling fan and the second end of the alternating current power supply; and the fourth end of the control board of the power device is connected to the second end of the cooling fan and is also connected to the first end of the alternating current power supply after passing through the second temperature controller.
In some embodiments, the first and second temperature control modules controlling the on or off states of the heat dissipation unit and the switching unit according to the temperature of the power device include: if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a turn-off state, and the cooling fan is kept in a turn-off state; if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the cooling fan to be in a re-running state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device.
In some embodiments, the first and second temperature control modules, which continue to control the on or off states of the heat dissipation unit and the switching unit according to the temperature of the power device, include: after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off; after the cooling fan is in a re-running state, if the temperature of the power device reaches a second set temperature or below, the second temperature controller is continuously closed to control the cooling fan to be in a re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
In some embodiments, further comprising: at least one of the first safety unit and the second safety unit; the first safety unit is arranged between the fourth end of the control board of the power device and the second end of the cooling fan; the second safety unit is arranged between the second end of the cooling fan and the second temperature controller; the first fuse unit and the second fuse unit are configured to fuse themselves in case of a short circuit of the heat dissipation fan to protect at least the power device and the second temperature control module.
In accordance with another aspect of the present invention, there is provided an electrical apparatus, including: the heat dissipation control device of the power device is described above.
In another aspect, the present invention provides a method for controlling heat dissipation of a power device, including: under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in a disconnected state; the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range; after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit; under the condition that the power device is shut down and the heat dissipation unit is shut down after the time delay operation is carried out for a set time, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device; the switch unit and the first temperature control module are arranged between a control board of the power device and an alternating current power supply; the control board of the power device is connected to the heat dissipation unit; and a connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module.
In some embodiments, the first and second temperature control modules controlling the on or off states of the heat dissipation unit and the switching unit according to the temperature of the power device include: if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a turn-off state, and the cooling fan is kept in a turn-off state; if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the cooling fan to be in a re-running state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device.
In some embodiments, the first and second temperature control modules, which continue to control the on or off states of the heat dissipation unit and the switching unit according to the temperature of the power device, include: after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off; after the cooling fan is in a re-running state, if the temperature of the power device reaches a second set temperature or below, the second temperature controller is continuously closed to control the cooling fan to be in a re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
In some embodiments, further comprising: under the condition that the cooling fan is short-circuited, the first safety unit and the second safety unit fuse the first safety unit and the second safety unit to protect at least the power device and the second temperature control module; the first safety unit is arranged between the fourth end of the control board of the power device and the second end of the cooling fan; the second safety unit is arranged between the second end of the cooling fan and the second temperature controller.
Therefore, according to the scheme of the invention, the fan is started according to the start-stop controller of the unit, and the fan can be automatically started according to the temperature in the frequency converter, so that the temperature in the frequency converter is ensured to be within a set range, the temperature rise in the frequency converter can be timely dissipated, and the service life of components is prolonged.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a heat dissipation control apparatus for a power device according to the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of a heat dissipation device of a high-power frequency converter;
FIG. 3 is a schematic structural diagram of another embodiment of a heat dissipation device of a high-power frequency converter;
FIG. 4 is a schematic diagram illustrating a heat dissipation control flow of an embodiment of a heat dissipation apparatus for a high power inverter;
fig. 5 is a flowchart illustrating an embodiment of a method for controlling heat dissipation of a power device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a heat dissipation control apparatus for a power device. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The heat dissipation control device of the power device may include: temperature control unit, switch unit and heat dissipation unit. The temperature control unit includes: the temperature control device comprises a first temperature control module and a second temperature control module. The switch unit and the first temperature control module are arranged between a control panel of the power device and an alternating current power supply. And the control board of the power device is connected to the heat dissipation unit. And a connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module. The power device, such as a high-power frequency converter; wherein, the power below a dozen kilowatts is low power, and the power above the dozen kilowatts is high power. A first temperature control module, such as a first temperature controller KT 1. And a second temperature control module, such as a second temperature controller KT 2. And a switching unit, such as a first relay KA 1. And a heat dissipation unit, such as a heat dissipation fan.
Under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in an off state; and the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range. Specifically, when the frequency converter normally operates, the first temperature controller KT1, the second temperature controller KT2 and the first relay KA1 are normally open, at this time, the control board controls the operation of the cooling fan, and the evaporator cools, so that the temperature of the frequency converter is maintained within a normal range (for example, the temperature in the frequency converter cabinet normally operates at 35 ℃).
And after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit. Specifically, when the unit is shut down, the control panel will delay to turn off the cooling fan for three minutes, at which time the evaporator stops working. And under the condition that the power device is stopped and the heat dissipation unit is closed after the time delay operation is carried out for a set time, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device.
Therefore, the fan is started according to the start-stop controller of the unit, and the fan can be automatically started according to the temperature in the frequency converter, so that the temperature in the frequency converter is ensured to be within a set range, the problem that the high-power frequency converter cannot automatically control the temperature in the cabinet is solved, the temperature of the frequency converter is reduced, the service life of the frequency converter is prolonged, the workload of after-sale maintenance is reduced, and the after-sale maintenance cost is reduced.
In some embodiments, the switching unit includes: a first relay (e.g., first relay KA 1). The first temperature control module includes: the first temperature controller (such as the first temperature controller KT 1). The second temperature control module includes: the second temperature controller (such as the second temperature controller KT 2). The heat dissipation unit includes: a heat dissipation fan.
The normally closed contact of the first relay is connected between the first end of the control board of the power device and the first end of the alternating current power supply. And the second end of the control board of the power device is connected to the second end of the alternating current power supply. And the second end of the control board of the power device is connected to the first end of the alternating current power supply after passing through the coil of the first relay and the first temperature controller, and is connected to the first end of the alternating current power supply after passing through the normally open contact of the first relay.
And the third end of the control board of the power device is connected to the first end of the cooling fan and the second end of the alternating current power supply. And the fourth end of the control board of the power device is connected to the second end of the cooling fan and is also connected to the first end of the alternating current power supply after passing through the second temperature controller.
In some embodiments, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, including the following two control conditions:
the first control case: under the condition that the power device is shut down and the heat dissipation unit is shut down after the heat dissipation unit is operated for a set time delay, if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a shut-off state, and the heat dissipation fan is maintained in a shut-down state. Specifically, when the temperature in the frequency converter cabinet is reduced to below 40 ℃ after three minutes, the cooling fan stops working.
The second control case: under the condition that the power device is shut down and the heat dissipation unit is shut down after delaying the operation for a set time, if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the heat dissipation fan to be in a re-operation state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device. Specifically, when the temperature in the frequency converter cabinet does not fall below 40 ℃ after three minutes but does not reach 60 ℃, only the second temperature controller KT2 is triggered to be closed, so that the cooling fan continues to work, the heat can be dissipated after the unit is shut down, and the service life of components of the unit is ensured.
In some embodiments, the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, and the following two further control conditions are included:
the first further control case: after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off. Specifically, if the temperature in the frequency converter cabinet can be reduced to below 40 ℃ by the cooling fan after the shutdown, the cooling fan stops working.
Second further control case: after the cooling fan is in a re-running state, if the temperature of the power device reaches a second set temperature or below, the second temperature controller is continuously closed to control the cooling fan to be in a re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
Specifically, if it can't dispel the heat to shut down the back radiator fan, when the ambient temperature in the converter cabinet reached 60 ℃, first temperature controller KT1 will trigger the action this moment, first temperature controller KT1 becomes the closure state by original normally open state, because first temperature controller KT1 is closed, first relay KA 1's coil will be electrified, then the normally closed contact of the first relay KA1 of trigger control becomes the off-state, the control panel will not be electrified this moment, thereby arouse the secondary side outage, the input power of converter will be cut off like this, electrical equipment also is the stop work, and then obtain the protection.
Meanwhile, the normally open contact of the first relay KA1 becomes a closed state, and a self-locking function is provided for the first temperature controller KT 1. At the moment, the temperature reaches above 40 ℃, the second temperature controller KT2 is closed, so that the heat radiation fan is driven to continue radiating, and the internal temperature of the frequency converter can be reduced to below 40 ℃. However, although the temperatures around the first temperature controller KT1 and the second temperature controller KT2 are reduced to below 60 degrees, the first temperature controller KT1 and the second temperature controller KT2 are disconnected and reset, because the normally open contact controlled by the first relay KA1 is already in a closed state, the coil of the first relay KA1 is always in an electrified state, the normally closed contact of the first relay KA1 controlling the power input end is always in an open state, so that the electrical equipment is always protected, if the electrical equipment needs to be restarted, after personnel do not find abnormality in site, the input power is powered off, the first relay KA1 is reset, and the electrical equipment can be started normally.
Therefore, the mainboard is used for controlling the fan to operate, so that the fan rotates along with the operation of the equipment, and when the equipment stops operating, the fan is turned off in a delayed manner; after time delay, the temperature control switch triggers the heat dissipation fan to dissipate heat based on whether the temperature inside the frequency converter exceeds a temperature protection threshold value, so that the purpose of heat dissipation is achieved.
In some embodiments, further comprising: at least one of the first safety unit and the second safety unit.
The first safety unit is arranged between the fourth end of the control board of the power device and the second end of the cooling fan. The second safety unit is arranged between the second end of the cooling fan and the second temperature controller. The first fuse unit and the second fuse unit are configured to fuse themselves in case of a short circuit of the heat dissipation fan to protect at least the power device and the second temperature control module. Specifically, if the heat dissipation fan is damaged and short-circuited, the fuse tube is fused, so as to avoid affecting other loops.
Through a large number of tests, the technical scheme of the invention is adopted, the fan is started according to the start-stop controller of the unit and also can be automatically started according to the temperature in the frequency converter, so that the temperature in the frequency converter is ensured to be within a set range, the problem that the temperature in a cabinet cannot be automatically controlled by the high-power frequency converter is solved, and the timely and reliable heat dissipation of the temperature in the frequency converter is improved.
According to the embodiment of the invention, the electrical equipment corresponding to the heat dissipation control device of the power device is also provided. The electric device may include: the heat dissipation control device of the power device is described above.
In general, the high-power frequency converter does not control the start and stop of the fan, and after the electrical equipment is powered on, the fan starts to work, so that the fan is always in a working state, and the risk of damage to the fan is increased.
Fig. 2 is a schematic structural diagram of an embodiment of a heat dissipation device of a high-power frequency converter. As shown in fig. 2, the heat dissipation device of the high power frequency converter includes: control panel, radiator fan, first relay KA1 and first temperature controller KT 1. The first end of the control board is connected to the first end of the 220V alternating current power supply through the normally closed contact of the first relay KA 1. And the second end of the control board is connected to the second end of the 220V alternating current power supply. The second end of the control panel still passes through the coil of first relay KA1, on the one hand through being connected to 220V alternating current power supply's first end behind first temperature controller KT1, on the other hand through being connected to 220V alternating current power supply's first end behind the normally open contact of first relay KA 1. The third end of the control board is connected to the first end of the cooling fan, and the fourth end of the control board is connected to the second end of the cooling fan.
Use the mainboard control fan to open and stop, then can reduce the fan effectively and be doing useless power, but can not control the temperature in the converter well, because after the converter stop work, equipment probably still has a large amount of waste heat, if can not in time discharge, then can gather in inside to reduce the life of components and parts. If the mainboard is turned off in a delayed manner, the delay time changes due to the working environment, and the threshold of the control time is not good.
In some embodiments, the scheme of the invention designs a heat dissipation device of a high-power frequency converter, so that the fan can be started according to a start-stop controller of a unit, and the fan can be automatically started according to the temperature in the frequency converter, thereby ensuring that the temperature in the frequency converter is within a set range, solving the problem that the high-power frequency converter cannot automatically control the temperature in a cabinet, reducing the workload of after-sale maintenance and reducing the after-sale maintenance cost.
The frequency converter related to the scheme of the invention is a high-power frequency converter capable of radiating. The frequency converter can control the fan to rotate through the mainboard, so that the fan rotates along with the work of the equipment, and when the equipment stops working, the fan is turned off in a delayed manner; after time delay, the temperature control switch triggers the heat dissipation fan to dissipate heat based on whether the temperature inside the frequency converter exceeds a temperature protection threshold value, so that the purpose of heat dissipation is achieved. And if the heat radiation fan is damaged and has a short circuit, the protective tube is fused, so that other loops are not influenced.
The following describes an exemplary implementation process of the scheme of the present invention with reference to the examples shown in fig. 3 and fig. 4.
As shown in fig. 3, the heat dissipation device of the high power frequency converter includes: control panel, radiator fan, auxiliary relay (like first relay KA1), first temperature controller KT1, second temperature controller KT2 and two protective tubes FU.
In the example shown in fig. 3, a control board, a cooling fan, a first relay KA1 and a first temperature controller KT 1. The first end of the control board is connected to the first end of the 220V alternating current power supply through the normally closed contact of the first relay KA 1. And the second end of the control board is connected to the second end of the 220V alternating current power supply. The second end of the control panel still passes through the coil of first relay KA1, on the one hand through being connected to 220V alternating current power supply's first end behind first temperature controller KT1, on the other hand through being connected to 220V alternating current power supply's first end behind the normally open contact of first relay KA 1. And the third end of the control board is connected to the third end of the cooling fan on one hand and is also connected to the second end of the 220V alternating current power supply on the other hand. The fourth end of control panel is connected to radiator fan's second end on the one hand behind an FU protective tube, on the other hand is connected to 220V alternating current power supply's first end behind another FU protective tube and second temperature controller KT 2.
Fig. 4 is a schematic diagram of a heat dissipation control flow of an embodiment of a heat dissipation device of a high-power frequency converter. As shown in fig. 4, the heat dissipation control flow of the heat dissipation device of the high-power frequency converter includes:
step 1, when the frequency converter normally operates, the first temperature controller KT1, the second temperature controller KT2 and the first relay KA1 are in a normally open state, at the moment, the control panel controls the operation of the cooling fan, and the evaporator refrigerates, so that the temperature of the frequency converter is maintained within a normal range (for example, the temperature in the frequency converter cabinet normally operates at 35 ℃). Wherein, the inside evaporimeter of converter for the heat dissipation of the inside environment of converter is used.
And 2, after the unit is stopped, the control panel delays for three minutes to turn off the cooling fan, the evaporator stops working at the moment, and then the step 3 or the step 4 is executed.
And 3, when the temperature in the frequency converter cabinet is reduced to below 40 ℃ after three minutes, stopping the work of the cooling fan.
And 4, when the temperature in the frequency converter cabinet does not fall below 40 ℃ after three minutes but does not reach 60 ℃, only triggering the second temperature controller KT2 to be closed to enable the cooling fan to continue working, ensuring that the heat can be dissipated after the unit is shut down, further ensuring the service life of components of the unit, and then executing the step 5 or the step 6.
And 5, if the temperature in the frequency converter cabinet can be reduced to below 40 ℃ by the cooling fan after the shutdown, stopping the cooling fan.
Step 6, if the radiator fan can't dispel the heat after shutting down, when the ambient temperature in the converter cabinet reached 60 ℃, first temperature controller KT1 will trigger the action this moment, first temperature controller KT1 becomes the closure state by original normally open state, because first temperature controller KT1 is closed, first relay KA 1's coil will be electrified, then the normally closed contact of the first relay KA1 of trigger control becomes the off-state, the control panel will not be electrified this moment, thereby arouse the secondary side (being the auxiliary control side of converter) outage, the input power of converter will be cut off like this, electrical equipment also stop work, and then obtain the protection. The main circuit of the frequency converter is the primary side, and the auxiliary control side of the frequency converter (namely, the auxiliary control side which is controlled by low voltage to be switched on or switched off by high voltage).
Meanwhile, the normally open contact of the first relay KA1 becomes a closed state, and a self-locking function is provided for the first temperature controller KT 1. At the moment, the temperature reaches above 40 ℃, the second temperature controller KT2 is closed, so that the heat radiation fan is driven to continue radiating, and the internal temperature of the frequency converter can be reduced to below 40 ℃. However, although the temperatures around the first temperature controller KT1 and the second temperature controller KT2 are reduced to below 60 degrees, the first temperature controller KT1 and the second temperature controller KT2 are disconnected and reset, because the normally open contact controlled by the first relay KA1 is already in a closed state, the coil of the first relay KA1 is always in an electrified state, the normally closed contact of the first relay KA1 controlling the power input end is always in an open state, so that the electrical equipment is always protected, if the electrical equipment needs to be restarted, after personnel do not find abnormality in site, the input power is powered off, the first relay KA1 is reset, and the electrical equipment can be started normally.
The scheme of the invention is that the temperature controller detects the temperature to trigger the protection of the circuit, so that the temperature controller can be used for starting high-power devices such as a frequency converter cabinet, an electric cabinet, a load box and the like except for being applied to a high-power frequency converter.
Since the processes and functions implemented by the electrical apparatus of this embodiment substantially correspond to the embodiments, principles, and examples of the apparatus shown in fig. 1, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
Through a large number of tests, the technical scheme of the invention can automatically start the fan according to the temperature in the frequency converter by starting the fan according to the start-stop controller of the unit, thereby ensuring the temperature in the frequency converter to be within a set range, reducing the damage of devices, reducing the workload of after-sale maintenance and reducing the after-sale maintenance cost.
According to an embodiment of the present invention, a method for controlling heat dissipation of a power device corresponding to an electrical apparatus is also provided, as shown in fig. 5, which is a schematic flow chart of an embodiment of the method of the present invention. The heat dissipation control method of the power device can comprise the following steps: step S110 to step S130.
At step S110, in a case that the power device normally operates, the switching unit, the first temperature control module, and the second temperature control module are all in an off state; and the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range. Specifically, when the frequency converter normally operates, the first temperature controller KT1, the second temperature controller KT2 and the first relay KA1 are normally open, at this time, the control board controls the operation of the cooling fan, and the evaporator cools, so that the temperature of the frequency converter is maintained within a normal range (for example, the temperature in the frequency converter cabinet normally operates at 35 ℃).
In step S120, after the power device is shut down, the control board of the power device controls the heat dissipation unit to operate for a set time in a delayed manner, and then the heat dissipation unit is turned off. Specifically, when the unit is shut down, the control panel will delay to turn off the cooling fan for three minutes, at which time the evaporator stops working. And the number of the first and second groups,
in step S130, under the condition that the power device is shut down and the heat dissipation unit is turned off after a set time delay operation, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, so as to perform heat dissipation processing on the temperature of the power device.
The switch unit and the first temperature control module are arranged between a control board of the power device and an alternating current power supply. And the control board of the power device is connected to the heat dissipation unit. And a connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module. The power device is, for example, a high-power frequency converter. A first temperature control module, such as a first temperature controller KT 1. And a second temperature control module, such as a second temperature controller KT 2. And a switching unit, such as a first relay KA 1. And a heat dissipation unit, such as a heat dissipation fan.
Therefore, the fan is started according to the start-stop controller of the unit, and the fan can be automatically started according to the temperature in the frequency converter, so that the temperature in the frequency converter is ensured to be within a set range, the problem that the high-power frequency converter cannot automatically control the temperature in the cabinet is solved, the temperature of the frequency converter is reduced, the service life of the frequency converter is prolonged, the workload of after-sale maintenance is reduced, and the after-sale maintenance cost is reduced.
In some embodiments, the first temperature control module and the second temperature control module in step S130 control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, including the following two control cases:
the first control case: under the condition that the power device is shut down and the heat dissipation unit is shut down after the heat dissipation unit is operated for a set time delay, if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a shut-off state, and the heat dissipation fan is maintained in a shut-down state. Specifically, when the temperature in the frequency converter cabinet is reduced to below 40 ℃ after three minutes, the cooling fan stops working.
The second control case: under the condition that the power device is shut down and the heat dissipation unit is shut down after delaying the operation for a set time, if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the heat dissipation fan to be in a re-operation state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device. Specifically, when the temperature in the frequency converter cabinet does not fall below 40 ℃ after three minutes but does not reach 60 ℃, only the second temperature controller KT2 is triggered to be closed, so that the cooling fan continues to work, the heat can be dissipated after the unit is shut down, and the service life of components of the unit is ensured.
In some embodiments, the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, and the following two further control conditions are included:
the first further control case: after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off. Specifically, if the temperature in the frequency converter cabinet can be reduced to below 40 ℃ by the cooling fan after the shutdown, the cooling fan stops working.
Second further control case: after the cooling fan is in a re-running state, if the temperature of the power device reaches a second set temperature or below, the second temperature controller is continuously closed to control the cooling fan to be in a re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
Specifically, if it can't dispel the heat to shut down the back radiator fan, when the ambient temperature in the converter cabinet reached 60 ℃, first temperature controller KT1 will trigger the action this moment, first temperature controller KT1 becomes the closure state by original normally open state, because first temperature controller KT1 is closed, first relay KA 1's coil will be electrified, then the normally closed contact of the first relay KA1 of trigger control becomes the off-state, the control panel will not be electrified this moment, thereby arouse the secondary side outage, the input power of converter will be cut off like this, electrical equipment also is the stop work, and then obtain the protection.
Meanwhile, the normally open contact of the first relay KA1 becomes a closed state, and a self-locking function is provided for the first temperature controller KT 1. At the moment, the temperature reaches above 40 ℃, the second temperature controller KT2 is closed, so that the heat radiation fan is driven to continue radiating, and the internal temperature of the frequency converter can be reduced to below 40 ℃. However, although the temperatures around the first temperature controller KT1 and the second temperature controller KT2 are reduced to below 60 degrees, the first temperature controller KT1 and the second temperature controller KT2 are disconnected and reset, because the normally open contact controlled by the first relay KA1 is already in a closed state, the coil of the first relay KA1 is always in an electrified state, the normally closed contact of the first relay KA1 controlling the power input end is always in an open state, so that the electrical equipment is always protected, if the electrical equipment needs to be restarted, after personnel do not find abnormality in site, the input power is powered off, the first relay KA1 is reset, and the electrical equipment can be started normally.
Therefore, the mainboard is used for controlling the fan to operate, so that the fan rotates along with the operation of the equipment, and when the equipment stops operating, the fan is turned off in a delayed manner; after time delay, the temperature control switch triggers the heat dissipation fan to dissipate heat based on whether the temperature inside the frequency converter exceeds a temperature protection threshold value, so that the purpose of heat dissipation is achieved.
In some embodiments, further comprising: and under the condition that the cooling fan is short-circuited, the first safety unit and the second safety unit fuse the first safety unit and the second safety unit to at least protect the power device and the second temperature control module.
The first safety unit is arranged between the fourth end of the control board of the power device and the second end of the cooling fan. The second safety unit is arranged between the second end of the cooling fan and the second temperature controller.
Specifically, if the heat dissipation fan is damaged and short-circuited, the fuse tube is fused, so as to avoid affecting other loops.
Since the processes and functions implemented by the method of the present embodiment substantially correspond to the embodiments, principles, and examples of the electrical apparatus, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of the present embodiment.
Through a large number of tests, the technical scheme of the embodiment is adopted, the fan is controlled to rotate by the mainboard, so that the fan rotates along with the operation of the equipment, and when the equipment stops working, the fan is turned off in a delayed manner; after time delay, the temperature control switch triggers the cooling fan to dissipate heat based on whether the temperature inside the frequency converter exceeds a temperature protection threshold value, so that the problem that the high-power frequency converter cannot automatically control the temperature in the cabinet is solved, the workload of after-sale maintenance is reduced, and the after-sale maintenance cost is reduced.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A heat dissipation control apparatus for a power device, comprising: the temperature control unit, the switch unit and the heat dissipation unit; the temperature control unit includes: the temperature control system comprises a first temperature control module and a second temperature control module; the switch unit and the first temperature control module are arranged between a control board of the power device and an alternating current power supply; the control board of the power device is connected to the heat dissipation unit; the connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module; wherein the content of the first and second substances,
under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in an off state; the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range;
after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit; and the number of the first and second groups,
and under the condition that the power device is stopped and the heat dissipation unit is closed after the time delay operation is carried out for a set time, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device.
2. The heat dissipation control device for power device as claimed in claim 1, wherein the switching unit comprises: a first relay; the first temperature control module includes: a first temperature controller; the second temperature control module includes: a second temperature controller; the heat dissipation unit includes: a heat radiation fan; wherein the content of the first and second substances,
the normally closed contact of the first relay is connected between the first end of the control board of the power device and the first end of the alternating current power supply; the second end of the control board of the power device is connected to the second end of the alternating current power supply; the second end of the control panel of the power device is connected to the first end of the alternating current power supply after passing through the coil of the first relay, the first temperature controller and the normally open contact of the first relay;
the third end of the control board of the power device is connected to the first end of the cooling fan and the second end of the alternating current power supply; and the fourth end of the control board of the power device is connected to the second end of the cooling fan and is also connected to the first end of the alternating current power supply after passing through the second temperature controller.
3. The apparatus according to claim 2, wherein the first temperature control module and the second temperature control module control states of the heat dissipation unit and the switching unit to be turned on or off according to the temperature of the power device, and include:
if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a turn-off state, and the cooling fan is kept in a turn-off state;
if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the cooling fan to be in a re-running state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device.
4. The apparatus of claim 3, wherein the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, and the apparatus comprises:
after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off;
after the cooling fan is in a re-running state, if the temperature of the power device reaches a second set temperature or below, the second temperature controller is continuously closed to control the cooling fan to be in a re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
5. The heat dissipation control device for a power device according to any one of claims 1 to 4, further comprising: at least one of the first safety unit and the second safety unit; wherein the content of the first and second substances,
in the case where the heat dissipating unit includes a heat dissipating fan, the first safety unit is disposed between a fourth end of a control board of the power device and a second end of the heat dissipating fan;
under the condition that the second temperature control module comprises a second temperature controller, the second safety unit is arranged between the second end of the cooling fan and the second temperature controller;
the first fuse unit and the second fuse unit are configured to fuse themselves in case of a short circuit of the heat dissipation fan to protect at least the power device and the second temperature control module.
6. An electrical device, comprising: the heat dissipation control device of the power device as claimed in any one of claims 1 to 5.
7. A method for controlling heat dissipation of a power device, comprising:
under the condition that the power device normally operates, the switch unit, the first temperature control module and the second temperature control module are all in a disconnected state; the control board of the power device controls the heat dissipation unit to normally operate so as to maintain the temperature of the power device within a set temperature range;
after the power device is shut down, the control panel of the power device controls the heat dissipation unit to operate in a delayed mode for a set time and then closes the heat dissipation unit; and the number of the first and second groups,
under the condition that the power device is shut down and the heat dissipation unit is shut down after delaying the operation for a set time, the first temperature control module and the second temperature control module control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device so as to carry out heat dissipation treatment on the temperature of the power device;
the switch unit and the first temperature control module are arranged between a control board of the power device and an alternating current power supply; the control board of the power device is connected to the heat dissipation unit; and a connecting wire between the control panel of the power device and the heat dissipation unit is connected to an alternating current power supply after passing through the second temperature control module.
8. The method for controlling heat dissipation of a power device according to claim 7, wherein the first temperature control module and the second temperature control module control states of the heat dissipation unit and the switching unit to be turned on or off according to the temperature of the power device, and the method comprises:
under the condition that the heat dissipation unit comprises a heat dissipation fan, if the temperature of the power device is reduced to be lower than a first set temperature, the switch unit is continuously in a turn-off state, and the heat dissipation fan is kept in a turn-off state;
under the condition that the second temperature control module comprises a second temperature controller, if the temperature of the power device is not reduced below a first set temperature and does not reach a second set temperature, the second temperature controller is closed to control the cooling fan to be in a re-running state; and the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device.
9. The method for controlling heat dissipation of a power device according to claim 8, wherein the first temperature control module and the second temperature control module continue to control the on or off states of the heat dissipation unit and the switch unit according to the temperature of the power device, and the method comprises:
after the cooling fan is in a re-running state, if the temperature of the power device is reduced to be lower than a first set temperature, the second temperature controller is switched off to control the cooling fan to be switched off;
under the condition that the first temperature control module comprises a first temperature controller and the switch unit comprises a first relay, after the cooling fan is in a re-running state, if the temperature of the power device reaches below a second set temperature, the second temperature controller is continuously closed to control the cooling fan to be in the re-running state; and the first thermostat is also closed, so that the coil of the first relay is electrified to open the normally closed contact of the first relay, and the normally open contact of the first relay is closed, so as to cut off the connection between the control board of the power device and the alternating current power supply.
10. The method for controlling heat dissipation of a power device according to any one of claims 7 to 9, further comprising:
under the condition that the heat dissipation unit comprises a heat dissipation fan and the second temperature control module comprises a second temperature controller, the heat dissipation unit is fused through the first safety unit and the second safety unit under the condition that the heat dissipation fan is short-circuited, so that at least the power device and the second temperature control module are protected;
the first safety unit is arranged between the fourth end of the control board of the power device and the second end of the cooling fan; the second safety unit is arranged between the second end of the cooling fan and the second temperature controller.
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