CN112187137A - Air-cooled heat dissipation structure of frequency converter and control method for self-cleaning of air channel of frequency converter - Google Patents
Air-cooled heat dissipation structure of frequency converter and control method for self-cleaning of air channel of frequency converter Download PDFInfo
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- CN112187137A CN112187137A CN202011053451.3A CN202011053451A CN112187137A CN 112187137 A CN112187137 A CN 112187137A CN 202011053451 A CN202011053451 A CN 202011053451A CN 112187137 A CN112187137 A CN 112187137A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
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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
- H05K7/20918—Forced ventilation, e.g. on heat dissipaters coupled to components the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels
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- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
The invention discloses an air-cooled heat dissipation structure of a frequency converter and a control method for self-cleaning of an air duct of the frequency converter. The frequency converter comprises a shell and a control circuit, wherein the control circuit comprises a controller, the shell comprises a cooling air channel, a radiator is arranged in the cooling air channel, a fan is arranged at one end of an air outlet of the cooling air channel, an air inlet window is arranged at one end of an air inlet of the cooling air channel, and the fan is a bidirectional fan; the control circuit comprises a fan forward and reverse rotation driving circuit, a motor of the bidirectional fan is connected with the fan forward and reverse rotation driving circuit, and a control end of the fan forward and reverse rotation driving circuit is connected with the controller. The invention can automatically clean the cooling air duct by controlling the reverse rotation of the fan, does not need to additionally increase a fan, and has small volume and low cost of the frequency converter.
Description
[ technical field ]
The invention relates to a frequency converter, in particular to an air-cooled heat dissipation structure of the frequency converter and a control method for self-cleaning of an air channel of the frequency converter.
[ background art ]
The frequency converter is used as an important device for motor speed regulation, in order to protect safe and reliable work of the frequency converter, a protection circuit and a protection mechanism with various designs are basic guarantee for the reliability of the frequency converter, and as the frequency converter and an important heat dissipation system of the frequency converter, the frequency converter can stably and effectively keep the best work state and is a key point for guaranteeing the reliable operation of the frequency converter. The standard frequency converter generally adopts a fan cooling mode for heat dissipation and is vertically installed, the radiator is arranged in an air channel of the frequency converter, the lowest end of the air channel is an air inlet of the air channel, the highest end of the air channel is an air outlet of the air channel, heat loss tightly attached to a power device of the radiator is led out of the radiator through the operation of the fan in the air channel, and then heat on the surface of the radiator is blown or sucked out of equipment through air pressure and air volume generated by the fan. Thereby reducing the temperature of the internal electronic power devices. The device is guaranteed to work normally within an allowable range.
In an actual use environment, sundries often block an air inlet of an air channel due to the fact that the working environment is severe, the air inlet amount of a heat dissipation air channel is insufficient, an internal electronic power device is overheated, and the heat dissipation air channel of the frequency converter needs to be manually cleaned in order to guarantee the normal heat dissipation function of the frequency converter.
For example, silk dress debris such as common cotton fibre, dust in textile industry environment in the converter use, because of the air current that the fan operation produced drives, very easily adsorbed in air intake department, long-pending long-term the accumulation leads to the air intake to block up, leads to the heat that the fan was taken away not enough, arouses the inside electron device thermal protection of radiator or loses efficacy, the unable normal work of converter.
The utility model with the patent number of CN201820795971.3 discloses a special frequency converter for an air jet loom, which comprises a main machine, a shell and a partition board arranged in the shell, wherein the shell is divided into a main machine installation cavity and a cooling air channel by the partition board; a second fan is arranged in the cooling air duct between the air inlet filter screen and the radiating fin, and the second fan is positioned at one end close to the air inlet filter screen; the utility model discloses a through increasing No. two fans, can avoid the wind channel to block up, however, increase a fan and can lead to converter volume increase, cost increase.
[ summary of the invention ]
The invention aims to solve the technical problem of providing an air-cooled heat dissipation structure of a frequency converter, which can still carry out air duct self-cleaning without additionally adding a fan.
The technical problem to be solved by the invention is to provide a control method for self-cleaning of an air duct of a frequency converter with the air-cooling heat dissipation structure.
In order to solve the technical problems, the invention adopts the technical scheme that the air-cooled heat dissipation structure of the frequency converter comprises a shell of the frequency converter and a control circuit, wherein the control circuit comprises a controller, the shell comprises a cooling air channel, a radiator is arranged in the cooling air channel, a fan is arranged at one end of an air outlet of the cooling air channel, an air inlet window is arranged at one end of an air inlet of the cooling air channel, and the fan is a bidirectional fan; the control circuit comprises a fan forward and reverse rotation driving circuit, a motor of the bidirectional fan is connected with the fan forward and reverse rotation driving circuit, and a control end of the fan forward and reverse rotation driving circuit is connected with the controller.
In the air-cooled heat dissipation structure of the frequency converter, the control circuit comprises the cooling air channel air inlet temperature sensor and the radiator temperature sensor, and the signal output end of the cooling air channel air inlet temperature sensor and the signal output end of the radiator temperature sensor are respectively connected with the controller.
In the air-cooling heat dissipation structure of the frequency converter, the fan forward and reverse rotation driving circuit comprises a fan motor power supply circuit and a fan motor control circuit, the fan motor power supply circuit comprises an MOS (metal oxide semiconductor) tube, a first optical coupler and a fifth resistor, and a motor power supply control signal output end of the controller is coupled with a grid electrode of the MOS tube through a first optical coupler; the drain electrode of the MOS tube is connected with the positive electrode of the motor power supply through a fifth resistor, and the source electrode of the MOS tube is connected with the negative electrode of the motor power supply; the positive pole input end of the fan motor is connected with the positive pole of the motor power supply, and the negative pole is connected with the drain electrode of the MOS tube; the fan motor control circuit comprises a triode, a second optocoupler and a seventh resistor, wherein a motor positive and negative rotation control signal output end of the controller is connected with a base electrode of the triode through the second optocoupler, a collector electrode of the triode is connected with a positive electrode of a motor power supply through the seventh resistor, and an emitter electrode of the triode is connected with a negative electrode of the motor power supply; the control end of the fan motor is connected with the collector of the triode.
In the air-cooling heat dissipation structure of the frequency converter, the power supply circuit of the fan motor comprises a first voltage-regulator tube and a diode, wherein the cathode of the first voltage-regulator tube is connected with the grid electrode of the MOS tube, and the anode of the first voltage-regulator tube is connected with the source electrode of the MOS tube; the anode of the diode is connected with the drain electrode of the MOS tube, and the cathode of the diode is connected with the anode of the power supply of the motor; the fan motor control circuit comprises a second voltage-stabilizing tube, wherein the anode of the second voltage-stabilizing tube is connected with the emitting electrode of the triode, and the cathode of the second voltage-stabilizing tube is connected with the collecting electrode of the triode.
A control method for self-cleaning of an air channel of a frequency converter adopts an air-cooled heat dissipation structure of the frequency converter and comprises the following working steps: the reverse rotation time of the fan in the self-cleaning mode is set, when the frequency converter enters the self-cleaning mode, the controller controls the bidirectional fan to reversely rotate through the forward and reverse rotation driving circuit of the fan according to the set reverse rotation time, and reverse air supply of the cooling air channel of the frequency converter is achieved.
In the control method of the frequency converter, the self-cleaning mode is set according to the system and is started and executed when the frequency converter is electrified, operated and/or stopped; if the self-cleaning mode is executed when the frequency converter is powered on and/or operates, and the fan rotates reversely for a long time, the bidirectional fan rotates forwards to recover the forward air supply; if the self-cleaning mode is executed when the frequency converter is stopped, the bidirectional fan stops running after the fan reverse rotation time length is reached.
According to the control method of the frequency converter, the control circuit comprises the cooling air channel air inlet temperature sensor and the radiator temperature sensor, and the signal output end of the cooling air channel air inlet temperature sensor and the signal output end of the radiator temperature sensor are respectively connected with the controller; and comprises the following working steps: comparing the temperature T1 of the air inlet of the cooling air duct with the temperature TH of the radiator, wherein the difference between T1 and TH is delta T; when Δ T is greater than the set value while the temperature TH of the radiator is less than the radiator limit test value THmax, the self-cleaning mode is started and executed.
According to the control method of the frequency converter, the execution time of the self-cleaning mode is controlled according to the temperature of the air inlet of the cooling air duct; the higher the temperature of the air inlet of the cooling air duct is, the shorter the execution time of the self-cleaning mode is; the lower the temperature of the air inlet of the cooling air duct is, the longer the self-cleaning mode is executed.
In the control method of the frequency converter, in the self-cleaning mode operation process, the reverse rotation time of the bidirectional fan is Tcc, and the product of Tcc and T1 is a self-cleaning mode operation reference coefficient; when the self-cleaning mode is finished, if the product of Tcc and T1 is larger than the set value of the self-cleaning mode operation reference coefficient, the bidirectional fan is switched to be in positive rotation operation; when the self-cleaning mode is ended, if the product of Tcc and T1 is still less than the set value of the self-cleaning mode operation reference coefficient, the self-cleaning mode is entered again.
And when the delta T is larger than a set value, but the temperature TH of the radiator is larger than or equal to the radiator limit test value THmax, the controller records the state, and automatically enters a self-cleaning mode after the frequency converter is stopped.
The invention can automatically clean the cooling air duct by controlling the reverse rotation of the fan, does not need to additionally increase a fan, and has small volume and low cost of the frequency converter.
[ description of the drawings ]
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a sectional view of a frequency converter according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of a control circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a power circuit of a fan motor according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a fan motor control circuit according to an embodiment of the present invention.
Fig. 5 is a flowchart of a self-cleaning mode in a standby state of the frequency converter according to an embodiment of the present invention.
Fig. 6 is a flowchart of a self-cleaning mode in an operating state of the frequency converter according to the embodiment of the present invention.
[ detailed description of the invention ]
The structure of the frequency converter according to the embodiment of the invention is shown in fig. 1 to 4, and comprises a housing 10, wherein a cooling air duct M is arranged in the housing 10, a radiator 20 and a capacitor bank 60 are arranged in the cooling air duct M, the lower end of the cooling air duct M is an air inlet of the cooling air duct, and the upper end of the cooling air duct M is an air outlet of the cooling air duct. An air inlet window 30 is arranged at the air inlet. The air outlet is provided with a bidirectional fan 40 and a mesh enclosure 70.
The windows 31 of the intake louver 30 are arranged in a grid pattern, and the lower ends of the fins 21 of the radiator 20 are abutted against the intake louver 30. The grills of the intake window 30 block the fins 21 of the heat sink 20. The capacitor bank 60 is arranged between the heat sink 20 and the fan 40.
As shown in fig. 2, the control circuit of the frequency converter includes a controller, a fan forward/backward rotation driving circuit, a cooling air duct inlet temperature sensor and a radiator temperature sensor.
The motor of the bidirectional fan is connected with the fan forward and reverse rotation driving circuit, and the control end of the fan forward and reverse rotation driving circuit is connected with the controller.
And the signal output end of the cooling air duct air inlet temperature sensor and the signal output end of the radiator temperature sensor are respectively connected with the controller. As shown in fig. 1, the cooling air duct inlet temperature sensor is fixed on the air inlet window 30, and the radiator temperature sensor 51 is fixed on the radiator 20.
The fan forward and reverse rotation driving circuit comprises a fan motor power supply circuit and a fan motor control circuit.
The power supply circuit of the fan motor comprises an MOS (metal oxide semiconductor) tube M1, an optocoupler U1, a voltage regulator tube Z1, a diode D1 and a resistor R5, wherein the motor power supply control signal output end of the controller is connected with the grid electrode of the MOS tube M1 through an optocoupler U1. The drain electrode of the MOS tube M1 is connected with the positive electrode VCC2 of the motor power supply through a resistor R5, and the source electrode of the MOS tube M1 is connected with the negative electrode COM of the motor power supply. The positive pole input end of the fan motor is connected with the positive pole VCC2 of the motor power supply, and the negative pole of the fan motor is connected with the drain electrode of the MOS tube M1. The cathode of the voltage regulator tube Z1 is connected with the grid of the MOS tube M1, and the anode is connected with the source of the MOS tube M1. The anode of the diode D1 is connected with the drain of the MOS tube M1, and the cathode is connected with the positive pole VCC2 of the motor power supply.
The fan motor control circuit comprises a triode Q1, an optocoupler U2, a voltage regulator tube Z2 and a resistor R7, wherein a motor forward and reverse rotation control signal output end of the controller is connected with a base electrode of a triode Q1 through the optocoupler U2, a collector electrode of a triode Q1 is connected with a motor power supply positive electrode VCC2 through the resistor R7, and an emitter electrode of a triode Q1 is connected with a motor power supply negative electrode COM. The control terminal of the fan motor is connected with the collector of the transistor Q1. The anode of the voltage regulator tube Z2 is connected with the emitter of the triode Q1, and the cathode is connected with the collector of the triode Q1.
As shown in fig. 3 and 4, the FAN forward and reverse rotation driving circuit has three output terminals, wherein the "FAN +" terminal and the "FAN-" terminal are the FAN power supply terminals. And the FAN-set terminal is a positive and negative rotation control signal output end of the motor.
When the level of the signal output by the FAN-set terminal is high relative to the level of the FAN-set terminal, the FAN rotates forwards; when the signal output from the "FAN-set" terminal is at a low level with respect to the level of the "FAN-" terminal, the FAN is reversed.
In fig. 3 and 4, A FAN-A signal and A FAN-B signal are provided by the controller, the FAN-A signal is A motor power control signal, the FAN-B signal is A motor forward and reverse rotation control signal, and the FAN-A signal and the FAN-B signal are active at low level.
The FAN + 'terminal and the FAN-' terminal are connected with a power supply end of the FAN, and no potential difference exists between the FAN + 'terminal and the FAN-' terminal in a default state, and the potential difference is equal to the positive electrode voltage VCC2 of the motor power supply.
The FAN-set terminal is connected with the FAN control terminal, and the level of the FAN-set terminal in the default state is related to the Z2 regulated voltage value of the voltage stabilizing diode.
When the frequency converter runs and the heat dissipation system needs to run normally, the FAN-A level given by the controller is A low level. At the moment, the signal is subjected to optical coupling isolation to drive the MOS tube M1, at the moment, the power supply port of the FAN is connected to the power supply anode VCC2 through a FAN + 'terminal, the level of the FAN-' terminal is equivalent to the low level of the power supply cathode COM, and the FAN is connected with the power supply of the FAN.
When the FAN-B signal given by the controller is high level, the optical coupler U2 is not conducted. The transistor Q1 is in an off state, and the voltage of the FAN-set terminal is the regulated voltage of the Z1 Zener diode. Under the condition that the FAN power supply supplies power, the FAN-set signal is at a high level, and the FAN rotates forwards.
When a FAN-B signal given by a controller is at a low level, the optocoupler U2 is conducted to lead the triode Q1 to be switched on, at the moment, the voltage output by the FAN-set terminal is pulled down to the low level of the negative pole COM of the power supply by the triode Q1, and under the condition that the power supply of the FAN is switched on, the FAN-level is close to the low level of the COM port, namely, the levels of the FAN-set and the FAN-level are both low levels, the FAN can be started to rotate reversely after being stopped from the forward rotation direction, and different FANs have different switching times due to different inertia of FAN blades.
If the FAN + 'terminal and the FAN-' terminal are not connected with the power supply of the motor, the FAN cannot be started.
When the bidirectional fan 40 rotates reversely, the cooling air flows from top to bottom, flows in from the air outlet of the cooling air duct, and flows out from the air inlet of the cooling air duct; the dust and cotton wool blocked on the air inlet window grids are stripped by reverse cooling air under the dual actions of downward thrust and self gravity, and are blown away, so that the self-cleaning of the cooling air channel is realized.
In the embodiment 1 of the present invention, as shown in fig. 5, the control method for self-cleaning of the air duct of the frequency converter is the simplest open-loop parameter setting control, and only the time Tcc for the fan to rotate reversely in the standby state needs to be set. The time Tcc for the fan reverse rotation may be set to 15S-30S. Because the bidirectional fan has soft start time in the starting or switching process, when the maximum reverse wind speed is reached, the maximum wind speed and the maximum wind pressure can be reached only by running the wind speed for a certain time. After the frequency converter is electrified, whether three cleaning modes of electrification self-cleaning, self-cleaning in operation and self-cleaning after shutdown are set for internal parameters of the frequency converter is judged. Fig. 1 shows mainly two ways of self-cleaning by power-on and self-cleaning after shutdown. In the two judgment modes, the controller executes the operation command only after the self-cleaning time length Tcc is set. The method is characterized by simple control, but can not meet the application requirements when the system is stopped or needs to be quickly started after being started in partial application.
Embodiment 2 of the present invention, a method for controlling self-cleaning of a frequency converter air duct is shown in fig. 6. Embodiment 2 makes up the deficiency of embodiment 1, and embodiment 2 can run the self-cleaning program in the running state of the frequency converter, and the specific implementation manner is that, when the frequency converter runs in the rated state, the temperature T1 of the air inlet of the frequency converter equipment and the temperature TH of the radiator are detected by the controller, and the temperature difference Δ T between the temperatures T1 and TH is compared to judge whether the air inlet is blocked by foreign matters or not, and whether the self-cleaning mode is required or not. If the temperature difference reference value Tref in the controller can be set to be 50 ℃, the controller is judged to operate in a normal rated condition, and when delta T is less than 50 ℃, the components in the air duct of the frequency converter are judged to be capable of normally radiating, and a self-cleaning program is not required to be started; when the delta T is more than 50 ℃, the self-cleaning process can be judged to be started.
In addition, whether the temperature TH of the radiator exceeds the maximum value THmax or not is considered, and the THmax of the frequency converters with different specifications is inconsistent, the parameter is set to be adjustable, and the default THmax is 85 ℃. When TH > THmax is 85 ℃, because the cooling fan has a change in air volume and air pressure during the forward/reverse rotation switching process, in order to ensure the thermal stability of the electronic device on the heat sink, the controller records the state without entering the self-cleaning mode (i.e., the fan is switched from the forward rotation state to the reverse rotation state), and when the frequency converter is stopped, the self-cleaning mode after the frequency converter is stopped is automatically entered, i.e., the process described in embodiment 1. When TH is less than THmax, the controller judges that the frequency converter equipment can carry out the air channel self-cleaning mode, the frequency converter can stably run at the moment, the running direction of the fan is changed from forward running to reverse running (starting from the self-cleaning mode), and the length of the reverse running time Tcc is in inverse proportion to the change of the air inlet temperature T1. Tcc × T1 is defined as Kref (self-cleaning mode operation reference coefficient), and the setting value 1800 of the reference coefficient Kref indicates that the self-cleaning time lasts 30 seconds when the temperature of the air inlet is 60 ℃.
In the self-cleaning process, when Tcc × T1 is greater than or equal to Kref, it indicates that self-cleaning is completed. When Tcc × T1 is less than the set Kref, then the self-cleaning mode needs to be entered again.
According to the cleaning mode of the embodiment of the invention, the problem of blockage of the variable frequency air duct opening is solved, manual maintenance is not needed, a frequency converter with other heat dissipation modes is not needed, and the high economic benefit is realized for users or manufacturers.
Claims (10)
1. An air-cooled heat dissipation structure of a frequency converter comprises a shell of the frequency converter and a control circuit, wherein the control circuit comprises a controller, the shell comprises a cooling air channel, a radiator is arranged in the cooling air channel, a fan is arranged at one end of an air outlet of the cooling air channel, and an air inlet window is arranged at one end of an air inlet of the cooling air channel; the control circuit comprises a fan forward and reverse rotation driving circuit, a motor of the bidirectional fan is connected with the fan forward and reverse rotation driving circuit, and a control end of the fan forward and reverse rotation driving circuit is connected with the controller.
2. The air-cooled heat dissipation structure of inverter of claim 1, wherein the control circuit comprises a cooling air duct inlet temperature sensor and a heat sink temperature sensor, and the signal output terminal of the cooling air duct inlet temperature sensor and the signal output terminal of the heat sink temperature sensor are respectively connected to the controller.
3. The air-cooling heat dissipation structure of the frequency converter according to claim 1, wherein the fan forward/reverse rotation driving circuit comprises a fan motor power circuit and a fan motor control circuit, the fan motor power circuit comprises a MOS transistor, a first optical coupler and a fifth resistor, and a motor power control signal output end of the controller is coupled to a gate of the MOS transistor through a first optical coupler; the drain electrode of the MOS tube is connected with the positive electrode of the motor power supply through a fifth resistor, and the source electrode of the MOS tube is connected with the negative electrode of the motor power supply; the positive pole input end of the fan motor is connected with the positive pole of the motor power supply, and the negative pole is connected with the drain electrode of the MOS tube; the fan motor control circuit comprises a triode, a second optocoupler and a seventh resistor, wherein a motor positive and negative rotation control signal output end of the controller is connected with a base electrode of the triode through the second optocoupler, a collector electrode of the triode is connected with a positive electrode of a motor power supply through the seventh resistor, and an emitter electrode of the triode is connected with a negative electrode of the motor power supply; the control end of the fan motor is connected with the collector of the triode.
4. The air-cooling heat dissipation structure of the frequency converter according to claim 3, wherein the fan motor power supply circuit comprises a first voltage regulator tube and a diode, a cathode of the first voltage regulator tube is connected with a grid electrode of the MOS tube, and an anode of the first voltage regulator tube is connected with a source electrode of the MOS tube; the anode of the diode is connected with the drain electrode of the MOS tube, and the cathode of the diode is connected with the anode of the power supply of the motor; the fan motor control circuit comprises a second voltage-stabilizing tube, wherein the anode of the second voltage-stabilizing tube is connected with the emitting electrode of the triode, and the cathode of the second voltage-stabilizing tube is connected with the collecting electrode of the triode.
5. A control method for self-cleaning of an air duct of a frequency converter is characterized in that the air-cooled heat dissipation structure of the frequency converter of claim 1 is adopted, and the method comprises the following working steps: the reverse rotation time of the fan in the self-cleaning mode is set, when the frequency converter enters the self-cleaning mode, the controller controls the bidirectional fan to reversely rotate through the forward and reverse rotation driving circuit of the fan according to the set reverse rotation time, and reverse air supply of the cooling air channel of the frequency converter is achieved.
6. The control method of the inverter according to claim 5, wherein the self-cleaning mode is started and executed at power-on, operation and/or shutdown of the inverter according to system settings; if the self-cleaning mode is executed when the frequency converter is powered on and/or operates, and the fan rotates reversely for a long time, the bidirectional fan rotates forwards to recover the forward air supply; if the self-cleaning mode is executed when the frequency converter is stopped, the bidirectional fan stops running after the fan reverse rotation time length is reached.
7. The control method of the frequency converter according to claim 5, wherein the control circuit comprises a cooling air duct air inlet temperature sensor and a radiator temperature sensor, and a signal output end of the cooling air duct air inlet temperature sensor and a signal output end of the radiator temperature sensor are respectively connected with the controller; and comprises the following working steps: comparing the temperature T1 of the air inlet of the cooling air duct with the temperature TH of the radiator, wherein the difference between T1 and TH is delta T; when Δ T is greater than the set value while the temperature TH of the radiator is less than the radiator limit test value THmax, the self-cleaning mode is started and executed.
8. The control method of the frequency converter according to claim 7, wherein the time for executing the self-cleaning mode is controlled according to the temperature of the air inlet of the cooling air duct; the higher the temperature of the air inlet of the cooling air duct is, the shorter the execution time of the self-cleaning mode is; the lower the temperature of the air inlet of the cooling air duct is, the longer the self-cleaning mode is executed.
9. The method of claim 7, wherein during the self-cleaning mode operation, the time of the bidirectional fan reverse rotation is Tcc, and the product of Tcc and T1 is a self-cleaning mode operation reference coefficient; when the self-cleaning mode is finished, if the product of Tcc and T1 is larger than the set value of the self-cleaning mode operation reference coefficient, the bidirectional fan is switched to be in positive rotation operation; when the self-cleaning mode is ended, if the product of Tcc and T1 is still less than the set value of the self-cleaning mode operation reference coefficient, the self-cleaning mode is entered again.
10. The method as claimed in claim 7, wherein when Δ T is greater than the set value, but the temperature TH of the heat sink is greater than or equal to the heat sink limit test value THmax, the controller records the status, and automatically enters the self-cleaning mode after the shutdown when the frequency converter is shutdown.
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| CN202011053451.3A CN112187137A (en) | 2020-09-29 | 2020-09-29 | Air-cooled heat dissipation structure of frequency converter and control method for self-cleaning of air channel of frequency converter |
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| CN202011053451.3A CN112187137A (en) | 2020-09-29 | 2020-09-29 | Air-cooled heat dissipation structure of frequency converter and control method for self-cleaning of air channel of frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116256565A (en) * | 2023-02-27 | 2023-06-13 | 华能苏州热电有限责任公司 | Portable loop resistance tester |
| WO2024055372A1 (en) * | 2022-09-13 | 2024-03-21 | 阳光电源股份有限公司 | Power converter and automatic dust cleaning method |
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2020
- 2020-09-29 CN CN202011053451.3A patent/CN112187137A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024055372A1 (en) * | 2022-09-13 | 2024-03-21 | 阳光电源股份有限公司 | Power converter and automatic dust cleaning method |
| CN116256565A (en) * | 2023-02-27 | 2023-06-13 | 华能苏州热电有限责任公司 | Portable loop resistance tester |
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