CN218733845U - Inside dehumidification circuit of converter - Google Patents
Inside dehumidification circuit of converter Download PDFInfo
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- CN218733845U CN218733845U CN202222848728.2U CN202222848728U CN218733845U CN 218733845 U CN218733845 U CN 218733845U CN 202222848728 U CN202222848728 U CN 202222848728U CN 218733845 U CN218733845 U CN 218733845U
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Abstract
The utility model discloses a frequency converter internal dehumidifying circuit, which comprises a three-phase contactor MC1, a relay MC3, a control unit, a humidity sensor arranged in the frequency converter and a dehumidifying unit comprising a heating resistor RT and a fan; the output end of the control unit is connected with a coil of a three-phase contactor MC1, three phases of a three-phase alternating current power supply are respectively connected with the power supply input end of a rectification unit through three normally open contacts of the three-phase contactor MC1, and the control unit receives humidity data transmitted by a humidity sensor; the heating resistor RT is connected with a three-phase alternating current power supply through a normally open contact of the relay MC3, and the output end of the control unit is electrically connected with a coil of the relay MC 2; the power supply terminal of the fan is connected in a loop between the control unit and the coil of the relay MC 3. Before the converter circular telegram, detect the inside humidity of converter earlier, dehumidify when humidity is big, make the inside humidity of converter circular telegram back low, ensure that each electronic components inside the converter keeps dry not fragile.
Description
Technical Field
The utility model relates to a converter technical field, more specifically say and relate to an inside dehumidification circuit of converter.
Background
The frequency converter is an electric control device which applies the frequency converter technology and the microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. The frequency converter mainly comprises a rectifying module, an inversion module, a filter, a capacitor, a control unit, a driving unit, a power supply unit, a detection unit and the like.
At present, the converter will adapt to various environments, but in the environment steam, dust and season cold and hot alternation etc. all can't be avoided round the clock, these environmental factors will be accompanied to exist whole converter life cycle, when exceeding 85% RH humidity, easily to the inside various electronic device of converter, the creepage distance and the spatial distance of circuit produce adverse effect, thereby lead to the converter trouble to take place, especially in ore mine production process, the hauling of ore mainly adopts the electric locomotive to haul, the on-vehicle converter of electric locomotive is as the important power supply equipment of electric locomotive, and under rainy season and the moist condition in the pit, moist air gets into inside the converter casing through the conduction, various electronic components in the converter casing are extremely easily damaged with too much moist air contact, cause the converter can not normally use, serious production hauling efficiency that still can influence the ore.
Based on this, a "frequency converter internal dehumidifying device" with application number "202121174607.3" is designed, which comprises a dehumidifying device main body, wherein the dehumidifying device main body comprises a device shell, the top end surface of the device shell is connected with an auxiliary drying mechanism, and the top end internal connection of the device shell is connected with a first fan blade. Like this, when the humid air of device shell inside needs is dried, accessible external power source makes the inside resistance wire of device shell bottom begin to work, then makes first flabellum begin to work through external power source to take out the inside steam of device shell.
However, when the above-mentioned dehumidification device is used for dehumidification, the auxiliary drying mechanism needs to work on the resistance wire inside the frequency converter, that is, when the frequency converter is powered on, if the internal humidity of the frequency converter is high before the frequency converter is powered on, the electronic components inside the frequency converter are still in a humid environment when the frequency converter starts to be powered on, and various electronic components inside the frequency converter shell are still easily damaged due to contact with excessive humid air, so that the service life of the frequency converter is shortened.
In view of the above, the present application has made intensive studies and resulted in the present invention.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an inside dehumidification circuit of converter, it can ensure before the converter circular telegram that the inside humidity of converter is lower to guarantee that each electronic components of converter inside keeps dry not fragile, improve the life of converter.
In order to achieve the above purpose, the utility model discloses a solution is:
a dehumidification circuit inside a frequency converter is connected with the frequency converter for use, the frequency converter is provided with a three-phase alternating current power supply, and the frequency converter comprises a rectifying unit, a charging buffer and filtering unit and an inverting unit which are connected in sequence; the system comprises a three-phase contactor MC1, a relay MC3, a control unit, a humidity detection unit and a dehumidification unit for dehumidifying the interior of a frequency converter; the output end of the control unit is electrically connected with the coil of the three-phase contactor MC1 and is used for controlling the coil of the three-phase contactor MC1 to be switched on and switched off; three phases of the three-phase alternating current power supply are respectively connected with first ends of three normally open contacts of the three-phase contactor MC1 in a one-to-one manner, second ends of the three normally open contacts of the three-phase contactor MC1 are respectively connected with a power input end of the rectification unit, and the normally open contacts of the three-phase contactor MC1 are used for switching to be closed when a coil of the three-phase contactor MC1 is electrified so that the three-phase alternating current power supply supplies power to the frequency converter;
the humidity detection unit comprises a resistance-type humidity sensor, the humidity sensor is arranged inside the frequency converter, and a signal input end of the control unit is electrically connected with a detection end of the humidity sensor and used for receiving humidity data transmitted by the humidity sensor; the dehumidification unit comprises a heating resistor RT and a fan which are installed inside the frequency converter, wherein the first end of the heating resistor RT is connected with the L11 phase of the three-phase alternating current power supply, and the second end of the heating resistor RT is connected with the L21 phase of the three-phase alternating current power supply through a normally open contact of the relay MC3 and is used for switching to contact closure when a coil of the relay MC3 is electrified so that the three-phase alternating current power supply supplies power to the heating resistor RT; the output end of the control unit is electrically connected with the coil of the relay MC2 and is used for controlling the on-off of the coil of the relay MC 3; and the power supply end of the fan is connected in a loop between the control unit and the coil of the relay MC3 and is used for working when the coil of the relay MC3 is electrified.
The converter is equipped with the shell, the heating resistor RT is installed the inside of shell, and be located in the air-out scope of fan, humidity transducer is located in the air inlet scope of fan.
The humidity detection unit further comprises a humidity detection circuit, the humidity detection circuit comprises an operational amplifier U1 and a plurality of resistors, a resistor RH is arranged in the humidity sensor, the resistor RH is divided into three paths, the first path is connected with a reference voltage VREF through a resistor R1, the second path is grounded through a resistor R2, and the third path is connected with the in-phase end of the operational amplifier U1; the inverting end of the operational amplifier U1 is divided into two paths, one path is grounded through a resistor R3, and the other path is connected with the output end of the operational amplifier U1 through a resistor R4.
The control unit comprises a voltage comparator U2, a plurality of triodes and a plurality of resistors, and the output end of the operational amplifier U1 is also connected with the inverting end of the voltage comparator U2; the in-phase end of the voltage comparator U2 is divided into three paths, the first path is connected with reference voltage VREF through a resistor R8, the second path is grounded through a resistor R9, and the third path is connected with the output end of the voltage comparator U2 through a resistor R10 and a diode D3 in sequence; the output end of the voltage comparator U2 is also respectively connected with the second end of a resistor R11 and the first end of a resistor R12, the second end of the resistor R12 is connected with the base electrode of a triode T1, and the emitting electrode of the triode T1 and the first end of the resistor R11 are both connected with a voltage VC;
one end of a coil of the relay MC3 is respectively connected with the anode of the diode D1 and the ground, and the other end of the coil of the relay MC3 is respectively connected with the cathode of the diode D1, the positive end of the power supply of the fan, the collector of the triode T1 and the first end of the resistor R13; the second end of the resistor R13 is connected with the base electrode of the triode T2, the collector electrode of the triode T2 is divided into two paths, one path is connected with the voltage VC through a resistor R14, the other path is connected with the base electrode of the triode T3, and the emitting electrodes of the triode T2 and the triode T3 are both grounded; the collector of the triode T3 is connected with the base of the triode T4 through a resistor R15, the emitter of the triode T4 is connected with the voltage VC, and the collector of the triode T4 is grounded.
The triode T1 and the triode T4 are both PNP type triodes, and the triode T2 and the triode T3 are both NPN type triodes.
The control unit further comprises a relay MC4 and a power frequency transformer TF1, wherein the 1 st pin at the input side of the power frequency transformer TF1 is connected with the L21 phase of the three-phase alternating-current power supply, and the 2 nd pin at the input side of the power frequency transformer TF1 is connected with the L11 phase of the three-phase alternating-current power supply;
a 3 rd pin at a first output side of the power frequency transformer TF1 is grounded, a 4 th pin at the first output side of the power frequency transformer TF1 is connected with a voltage VC through a diode D2, and a filter capacitor C1 is connected between the voltage VC and a ground terminal, wherein the first output side of the power frequency transformer TF1 is used for generating the voltage VC after rectification and filtering;
a 5 th pin on the second output side of the power frequency transformer TF1 is connected with a first end of a coil of the three-phase contactor MC1 through a normally open contact of the relay MC4, and a 6 th pin on the second output side of the power frequency transformer TF1 is connected with a second end of the coil of the three-phase contactor MC 1; the collector of the triode T4 is divided into two paths, one path is connected with the cathode of the diode D4, the other path is connected with the first end of the coil of the relay MC4, and the second end of the coil of the relay MC4 and the anode of the diode D4 are both grounded; the second output side of the power frequency transformer TF1 is configured to supply power to the coil of the three-phase contactor MC1 when the coil of the relay MC4 is powered.
After the structure is adopted, the utility model discloses following beneficial effect has: when a three-phase alternating-current power supply is connected, the frequency converter is not started at the moment, the humidity inside the frequency converter is detected through the resistance-type humidity sensor, the resistance value of a resistor in the humidity sensor is larger when the humidity detected by the humidity sensor is larger than or equal to 85% RH, the control unit controls a coil of the three-phase contactor MC1 to be in a power-off state so that power supply between the three-phase alternating-current power supply and the frequency converter is disconnected, namely the frequency converter is in a non-working state, and meanwhile, the control unit controls a coil of the relay MC3 to be powered on so that the three-phase alternating-current power supply supplies power to the dehumidifying unit, and therefore the dehumidifying unit works to remove the humidity inside the frequency converter; when the detected humidity is less than 85 percent RH, the control unit controls the coil of the three-phase contactor MC1 to be electrified, and the three-phase alternating current power supply supplies power to the frequency converter to enable the frequency converter to work; compared with the prior art, the utility model discloses before for the converter circular telegram, detect the inside humidity of converter to in time dehumidify when humidity is great, in order to ensure that its inside humidity is lower after the converter circular telegram, thereby ensure that each electronic components of converter during operation converter inside keeps dry not fragile, improve the life of converter.
2. Triode T2, T3, T4 and resistance R13, R14 and R15 form the switch circuit of relay MC 4's coil jointly to when relay MC 3's coil got electric, relay MC 4's coil was in the outage state, otherwise, when relay MC 3's coil cuts off electric, relay MC 4's coil was in the state of getting electric, realize relay MC3 and relay MC4 interlocking control like this, converter work dehumidification unit does not start promptly, the unable dehumidification unit that charges of converter starts.
Drawings
Fig. 1 is a circuit block diagram of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
A dehumidification circuit in a frequency converter is connected with a conventional frequency converter for dehumidifying the inside of the frequency converter, the conventional frequency converter is provided with a three-phase alternating current power supply, the conventional frequency converter comprises a rectification unit, a charging buffer and filter unit and an inversion unit which are connected in sequence, and the circuit connection among the rectification unit, the charging buffer and filter unit and the inversion unit is the conventional connection circuit of the existing frequency converter, so that the description is not repeated.
As shown in fig. 1-2, the device comprises a three-phase contactor MC1, a relay MC3, a control unit, a humidity detection unit and a dehumidification unit; three phases of a three-phase alternating current power supply correspond to three pairs of normally open contacts of a three-phase contactor MC1 one by one respectively, wherein the three phases of the three-phase alternating current power supply correspond to an L11 phase, an L21 phase and an L31 phase respectively, the three phases of the three-phase alternating current power supply are connected with first ends of the normally open contacts corresponding to the three-phase contactor MC1 respectively, second ends of the three pairs of normally open contacts of the three-phase contactor MC1 and a power supply input end of a rectification unit, and the three pairs of normally open contacts of the three-phase contactor MC1 are used for switching to contact closure when a coil of the three-phase contactor MC1 is electrified so that the three-phase alternating current power supply supplies power to a frequency converter; the output end of the control unit is connected with the coil of the three-phase contactor MC1 and is used for controlling the coil of the three-phase contactor MC1 to be powered on and powered off. In the present embodiment, the three-phase contactor MC1 is an existing conventional three-phase electromagnetic contactor.
The humidity detection unit comprises a resistance-type humidity sensor, the resistance-type humidity sensor adopts a commercially available humidity sensor, the resistance-type humidity sensor is provided with a resistor RH, the resistance value of the resistor RH is larger when the humidity detected by the humidity sensor is larger, and conversely, the resistance value of the resistor RH is smaller when the humidity detected by the humidity sensor is smaller. In this embodiment, the humidity sensor is installed in the inside of converter, and the sense terminal electricity of humidity sensor connects the signal input part of the control unit for the inside humidity data transmission of converter that will detect for the control unit.
The dehumidification unit comprises a heating resistor RT and a fan which are respectively installed inside the frequency converter, one end of the heating resistor RT is connected with the L11 phase of the three-phase alternating current power supply, the other end of the heating resistor RT is connected with the L21 phase of the three-phase alternating current power supply through a normally open contact of the relay MC3, and the dehumidification unit is used for switching to contact closure when a coil of the relay MC3 is electrified so that the three-phase alternating current power supply supplies power to the heating resistor RT; the output end of the control unit is connected with the coil of the relay MC3 and used for controlling the on-off of the coil of the relay MC 3; the power supply terminal of the fan is connected to a circuit between the control unit and the coil of the relay MC3, and operates when the coil of the relay MC3 is energized.
Specifically, the rectifying unit of the frequency converter is provided with an L12 joint, an L22 joint and an L32 joint, wherein an L11 phase of the three-phase alternating-current power supply is connected with the L12 joint through a pair of normally open contacts of a three-phase contactor MC1, an L21 phase of the three-phase alternating-current power supply is connected with the L22 joint through a pair of normally open contacts of the three-phase contactor MC1, and an L31 phase of the three-phase alternating-current power supply is connected with the L32 joint through a pair of normally open contacts of the three-phase contactor MC 1; in this way, the three pairs of normally open contacts of the three-phase contactor MC1 are switched to control the three-phase ac power supply and the rectifying unit to be powered on or powered off.
The conventional frequency converter is provided with a shell, in the dehumidification unit, a heating resistor RT and a fan are respectively arranged inside the shell, the heating resistor RT and the fan are arranged close to each other, the heating resistor RT is positioned in an air outlet range of the fan, namely the heating resistor RT is arranged at an air outlet position of the fan, and a humidity sensor is arranged in an air inlet range of the fan, namely the humidity sensor is positioned at an air inlet of the fan, so that the humidity sensor is prevented from being positioned in the air outlet range of the fan, and the accuracy of the humidity sensor is ensured; in the present embodiment, the installation structures of the fan and the heating resistor RT can be respectively arranged by using the installation structure of the existing conventional frequency converter dehumidification device, and a description thereof will not be provided. Like this, when dehumidification unit during operation, heating resistor RT generates heat, and the fan is bad with steam inside the shell of converter to the inside air of heating converter makes the inside humidity rapid evaporation of converter, reduces the inside humidity of converter then.
The humidity detection unit further comprises a humidity detection circuit, the humidity detection circuit comprises an operational amplifier U1 and a plurality of resistors, the first end of a resistor RH in the humidity sensor is divided into three paths, the first path is connected with a reference voltage VREF through a resistor R1, the second path is grounded through a resistor R2, and the third path is connected with the non-inverting end of the operational amplifier U1; a second end of a resistor RH in the humidity sensor is connected with a GD end; the inverting end of the operational amplifier U1 is divided into two paths, one path is grounded through a resistor R3, and the other path is connected with the output end of the operational amplifier U1 through a resistor R4; the output end of the operational amplifier U1 is also connected with the input end of the control unit.
The control unit comprises a voltage comparator U2, a plurality of triodes and a plurality of resistors, the output end of the operational amplifier U1 is also connected with the inverting end of the voltage comparator U2, the in-phase end of the voltage comparator U2 is divided into three paths, the first path is connected with reference voltage VREF through a resistor R8, the second path is connected with a GD end through a resistor R9, and the third path is connected with the output end of the voltage comparator U2 sequentially through a resistor R10 and a diode D3; the output end of the voltage comparator U2 is also respectively connected with the second end of the resistor R11 and the first end of the resistor R12, the second end of the resistor R12 is connected with the base electrode of the triode T1, and the emitting electrode of the triode T1 and the first end of the resistor R11 are both connected with the voltage VC; one end of a coil of the relay MC3 is connected with the anode and the GD end of the diode D1 respectively, and the other end of the coil of the relay MC3 is connected with the cathode of the diode D1, the positive end of a power supply of the fan, the collector of the triode T1 and the first end of the resistor R13 respectively; the second end of the resistor R13 is connected with the base electrode of the triode T2, the collector electrode of the triode T2 is divided into two paths, one path is connected with the voltage VC through the resistor R14, the other path is connected with the base electrode of the triode T3, and the emitting electrodes of the triode T2 and the triode T3 are both connected with the GD end; the collector of the triode T3 is connected with the base of the triode T4 through a resistor R15, the emitter of the triode T4 is connected with the voltage VC, and the collector of the triode T4 is grounded. In this embodiment, the transistor T1 and the transistor T4 are both PNP transistors, and the transistor T2 and the transistor T3 are both NPN transistors.
Furthermore, the control unit further comprises a relay MC4 and a power frequency transformer TF1, wherein the 1 st pin at the input side of the power frequency transformer TF1 is connected with the L21 phase of the three-phase alternating-current power supply, and the 2 nd pin at the input side of the power frequency transformer TF1 is connected with the L11 phase of the three-phase alternating-current power supply; a 3 rd pin at the first output side of the power frequency transformer TF1 is connected with a GD end, a 4 th pin at the first output side of the power frequency transformer TF1 is connected with a voltage VC through a diode D2, the diode D2 is a conventional rectifier diode, and a filter capacitor C1 is connected between the voltage VC and the GD end, so that the first output side of the power frequency transformer TF1 mainly comprises the diode D2 and the filter capacitor C1, and the voltage VC is generated after rectification and filtering; a 5 th pin on the second output side of the power frequency transformer TF1 is connected with a first end of a coil of the three-phase contactor MC1 through a normally open contact of a relay MC4, and a 6 th pin on the second output side of the power frequency transformer TF1 is connected with a second end of the coil of the three-phase contactor MC 1; the collector of the triode T4 is divided into two paths, one path is connected with the cathode of the diode D4, the other path is connected with the first end of the coil of the relay MC4, and the second end of the coil of the relay MC4 and the anode of the diode D4 are both connected with the GD end; the second output side of the industrial frequency transformer TF1 is used for generating an alternating voltage to supply power to the coil of the three-phase contactor MC1 when the coil of the relay MC4 is energized.
In the present embodiment, the reference voltage VREF is a reference voltage generated by the voltage VC through the resistor R16, the capacitor C2, and the zener diode ZD 1.
The utility model relates to an operating principle of inside dehumidification circuit of converter does: the humidity sensor detects the humidity inside the frequency converter, detected humidity data is converted into a resistance RH value, the resistance RH value is transmitted to an operational amplifier U1 of the control unit, and a first voltage is output through the operational amplifier U1, wherein the first voltage is = [ VREF (R2// RH)/(R2// RH + R1) ] (1 + R4/R3); r2// RH is expressed as R2 and RH in parallel; then the first voltage is output to an inverting end of a voltage comparator U2, when the voltage of the inverting end of the voltage comparator U2 is smaller than the reference voltage of the non-inverting end of the voltage comparator U2, the voltage comparator U2 outputs a high level, and when the voltage of the inverting end of the voltage comparator U2 is larger than the reference voltage of the non-inverting end of the voltage comparator U2, the voltage comparator U2 outputs a low level; the voltage comparator U2, the resistor R8, the resistor R9, the resistor R10 and the diode D3 form a window comparator, the resistor R10 of the voltage comparator U2 and the diode D3 together form a voltage difference window, and there are two cases:
1. when the voltage difference window of the voltage comparator U2 is at a high level, the reference first voltage at the non-inverting terminal of the voltage comparator U2 is VREF × R9/(R8 + R9);
2. when the voltage difference window of the voltage comparator U2 is at a low level, the reference second voltage at the non-inverting terminal of the voltage comparator U2 is VREF [ R9// (RD 3+ R10) ]/(R8 + R9// (RD 3+ R10));
for example, when the window of the voltage difference of the voltage comparator U2 is 0.5V high, the non-inverting terminal of the voltage comparator U2 is 2V, and when the non-inverting terminal of the voltage comparator U2 is shifted to low, that is, the non-inverting terminal of the voltage comparator U2 is 1.5V (corresponding to 70 rh humidity, for example), that is, the humidity inside the inverter is high, and when the first voltage is greater than 2V (85 rh humidity), the output terminal of the voltage comparator U2 outputs low, that is, the humidity inside the inverter is greater than or equal to 85 rh, the latter triode T1 is turned on, so that the voltage output by the collector of the triode T1 is the voltage VC, thereby energizing both the coil and the fan of the relay MC3, the normally open contact of the relay MC3 is closed, the L11 phase and the L21 phase of the three-phase power supply power to the heat generation resistor RT, that is, and the dehumidifying unit starts to operate.
The first voltage is lowered due to the lowering of the humidity under the dehumidifying operation, and when the first voltage is lowered to less than 1.5V (75% rh humidity), the output terminal of the voltage comparator U2 is changed from low level to high level, that is, the humidity inside the inverter is low, and at this time, the output terminal of the voltage comparator U2 is at high level, the reference voltage of the non-inverting terminal of the voltage comparator U2 is changed to 2V again, that is, the humidity inside the inverter is less than 75% rh, that is, the humidity inside the inverter is less than 85% rh, the latter transistor T1 is not operated, and the collector of the transistor T1 is at low level, so that the coil of the relay MC3 is in a power-off state, the heating resistor RT is not operated, and the fan is not operated.
When relay MC 3's coil is in the outage state, triode T1's collector is low level, make triode T2's collecting electrode output high level, make triode T3 switch on, make triode T4 switch on afterwards, thereby make relay MC 4's coil switch on, make relay MC 4's normally open contact closed, the alternating voltage who makes power frequency transformer's second way output side produce gives three-phase contactor MC 1's coil power supply, make three-phase contactor MC 1's three all closed to the normally open contact, then make three-phase alternating current power supply give the converter power supply, make the converter normally work.
It should be noted that in the present embodiment, the humidity is 85% RH, and may be adjusted according to the environment where the actual inverter is located, and it is not limited to setting the humidity at 85% RH.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should belong to the scope of the claims of the present invention.
Claims (6)
1. A dehumidification circuit in a frequency converter is connected with the frequency converter for use, the frequency converter is provided with a three-phase alternating current power supply, and the frequency converter comprises a rectification unit, a charging buffer and filter unit and an inversion unit which are connected in sequence; the method is characterized in that: the system comprises a three-phase contactor MC1, a relay MC3, a control unit, a humidity detection unit and a dehumidification unit for dehumidifying the interior of a frequency converter; the output end of the control unit is electrically connected with the coil of the three-phase contactor MC1 and is used for controlling the coil of the three-phase contactor MC1 to be switched on and off; three phases of the three-phase alternating-current power supply are respectively connected with first ends of three normally open contacts of the three-phase contactor MC1 in a one-to-one mode, second ends of the three normally open contacts of the three-phase contactor MC1 are respectively connected with a power supply input end of the rectifying unit, and the normally open contacts of the three-phase contactor MC1 are used for switching to contact closure when a coil of the three-phase contactor MC1 is electrified so that the three-phase alternating-current power supply supplies power to the frequency converter;
the humidity detection unit comprises a resistance-type humidity sensor, the humidity sensor is arranged inside the frequency converter, and a signal input end of the control unit is electrically connected with a detection end of the humidity sensor and used for receiving humidity data transmitted by the humidity sensor; the dehumidification unit comprises a heating resistor RT and a fan which are installed inside the frequency converter, wherein the first end of the heating resistor RT is connected with the L11 phase of the three-phase alternating current power supply, and the second end of the heating resistor RT is connected with the L21 phase of the three-phase alternating current power supply through a normally open contact of the relay MC3 and is used for switching to contact closure when a coil of the relay MC3 is electrified so that the three-phase alternating current power supply supplies power to the heating resistor RT; the output end of the control unit is electrically connected with the coil of the relay MC3 and is used for controlling the on-off of the coil of the relay MC 3; and the power supply end of the fan is connected in a loop between the control unit and the coil of the relay MC3 and is used for working when the coil of the relay MC3 is electrified.
2. The internal dehumidifying circuit of a frequency converter according to claim 1, wherein: the converter is equipped with the shell, the heating resistor RT is installed the inside of shell, and be located in the air-out scope of fan, humidity transducer is located in the air inlet scope of fan.
3. The internal dehumidifying circuit of a frequency converter according to claim 2, wherein: the humidity detection unit also comprises a humidity detection circuit, the humidity detection circuit comprises an operational amplifier U1 and a plurality of resistors, a resistor RH is arranged in the humidity sensor and is divided into three paths, the first path is connected with a reference voltage VREF through a resistor R1, the second path is grounded through a resistor R2, and the third path is connected with the in-phase end of the operational amplifier U1; the inverting end of the operational amplifier U1 is divided into two paths, one path is grounded through a resistor R3, and the other path is connected with the output end of the operational amplifier U1 through a resistor R4.
4. The internal dehumidifying circuit of a frequency converter according to claim 3, wherein: the control unit comprises a voltage comparator U2, a plurality of triodes and a plurality of resistors, and the output end of the operational amplifier U1 is also connected with the inverting end of the voltage comparator U2; the in-phase end of the voltage comparator U2 is divided into three paths, the first path is connected with reference voltage VREF through a resistor R8, the second path is grounded through a resistor R9, and the third path is connected with the output end of the voltage comparator U2 through a resistor R10 and a diode D3 in sequence; the output end of the voltage comparator U2 is also respectively connected with the second end of a resistor R11 and the first end of a resistor R12, the second end of the resistor R12 is connected with the base electrode of a triode T1, and the emitting electrode of the triode T1 and the first end of the resistor R11 are both connected with a voltage VC;
one end of a coil of the relay MC3 is respectively connected with the anode of the diode D1 and the ground, and the other end of the coil of the relay MC3 is respectively connected with the cathode of the diode D1, the positive end of the power supply of the fan, the collector of the triode T1 and the first end of the resistor R13; the second end of the resistor R13 is connected with the base electrode of the triode T2, the collector electrode of the triode T2 is divided into two paths, one path is connected with the voltage VC through a resistor R14, the other path is connected with the base electrode of the triode T3, and the emitting electrodes of the triode T2 and the triode T3 are both grounded; the collector of the triode T3 is connected with the base of the triode T4 through a resistor R15, the emitter of the triode T4 is connected with the voltage VC, and the collector of the triode T4 is grounded.
5. The internal dehumidifying circuit of a frequency converter according to claim 4, wherein: the triode T1 and the triode T4 are both PNP type triodes, and the triode T2 and the triode T3 are both NPN type triodes.
6. The internal dehumidifying circuit of a frequency converter according to claim 5, wherein: the control unit further comprises a relay MC4 and a power frequency transformer TF1, wherein the 1 st pin at the input side of the power frequency transformer TF1 is connected with the L21 phase of the three-phase alternating-current power supply, and the 2 nd pin at the input side of the power frequency transformer TF1 is connected with the L11 phase of the three-phase alternating-current power supply;
a 3 rd pin at a first output side of the power frequency transformer TF1 is grounded, a 4 th pin at the first output side of the power frequency transformer TF1 is connected with a voltage VC through a diode D2, and a filter capacitor C1 is connected between the voltage VC and a ground terminal, wherein the first output side of the power frequency transformer TF1 is used for generating the voltage VC after rectification and filtering;
a 5 th pin on the second output side of the power frequency transformer TF1 is connected with a first end of a coil of the three-phase contactor MC1 through a normally open contact of the relay MC4, and a 6 th pin on the second output side of the power frequency transformer TF1 is connected with a second end of the coil of the three-phase contactor MC 1; the collector of the triode T4 is divided into two paths, one path is connected with the cathode of the diode D4, the other path is connected with the first end of the coil of the relay MC4, and the second end of the coil of the relay MC4 and the anode of the diode D4 are both grounded; the second output side of the industrial frequency transformer TF1 is used for supplying power to the coil of the three-phase contactor MC1 when the coil of the relay MC4 is electrified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222848728.2U CN218733845U (en) | 2022-10-27 | 2022-10-27 | Inside dehumidification circuit of converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222848728.2U CN218733845U (en) | 2022-10-27 | 2022-10-27 | Inside dehumidification circuit of converter |
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| CN218733845U true CN218733845U (en) | 2023-03-24 |
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| CN202222848728.2U Active CN218733845U (en) | 2022-10-27 | 2022-10-27 | Inside dehumidification circuit of converter |
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