CN215524883U - Dry-type transformer temperature controller fan fault detection circuit - Google Patents
Dry-type transformer temperature controller fan fault detection circuit Download PDFInfo
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- CN215524883U CN215524883U CN202121903576.0U CN202121903576U CN215524883U CN 215524883 U CN215524883 U CN 215524883U CN 202121903576 U CN202121903576 U CN 202121903576U CN 215524883 U CN215524883 U CN 215524883U
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Abstract
The utility model relates to the field of dry-type transformers, in particular to a fan fault detection circuit of a temperature controller of a dry-type transformer, which comprises a microprocessor and a fan working circuit, fan fault detection module and audible and visual alarm module, fan fault detection module includes current/voltage conversion module and signal processing module, current/voltage conversion module is connected with the signal processing module electricity, signal processing module is connected with microprocessor electricity, fan operating circuit includes fan power supply circuit and opens and stops control circuit, fan power supply circuit forms power supply circuit, it is connected with microprocessor electricity to open and stop control circuit, it includes the relay to open and stop control circuit, the relay has relay coil and relay normally open contact, current/voltage conversion module and relay normally open contact all establish ties in power supply circuit, audible and visual alarm module is connected with microprocessor electricity. The utility model has good practical use effect, low cost and small occupied space of the circuit board, and greatly improves the flexibility of the layout of the circuit board.
Description
Technical Field
The utility model relates to the technical field of dry-type transformers, in particular to a fan fault detection circuit of a temperature controller of a dry-type transformer.
Background
Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, etc., and simply, dry-type transformers refer to transformers in which the iron core and windings are not immersed in insulating oil. And the output capacity of the dry type transformer with forced air cooling can be improved by 50%. To improve the reliability of a dry type transformer. Real-time monitoring needs to be carried out on the cooling fan to prevent the dry-type transformer from being overloaded due to the fact that the cooling fan breaks down. The power of the heat dissipation fan of the conventional dry type transformer is between 40 and 100W, and the working current ratio is relatively small and is about 0.18A to 0.45A. The start-stop control, monitoring and fault alarming of the fan are all completed by the dry type transformer temperature controller. The general method is to detect the working current of the fan to judge whether the fan has a fault. When the fan breaks down, the sound and light alarm is sent out to prompt a manager of the dry type transformer to carry out fault maintenance in time.
In the prior art, a mutual inductor is used as a current sensor to collect the working current of a fan so as to judge whether the fan breaks down or not by current. Forced air-cooled dry-type transformers are typically equipped with 2 or 6 fans. The cost of the current transformer and the peripheral circuit of the 2 matched temperature controllers of the fans is not large in the total cost of the temperature controllers, and the occupied area of the circuit board is small. However, the cost of 6 fans is greatly increased, and the area of the circuit board is unacceptable. The difficulty of circuit board design is increased, and the cost is increased when the size of the circuit board is increased. The present invention improves upon the above-mentioned deficiencies.
Disclosure of Invention
In order to overcome the defects of the background art, the fan fault detection circuit of the temperature controller of the dry-type transformer, provided by the utility model, has a good actual use effect, and a mutual inductor with high cost and overlarge volume is not required to be arranged, so that the cost and the occupation of the space of a circuit board are greatly reduced, the flexibility of the layout of the circuit board is greatly improved, and the actual use requirements can be better met.
The technical scheme adopted by the utility model is as follows: a fan fault detection circuit of a dry type transformer temperature controller comprises a microprocessor, a fan working circuit, a fan fault detection module and an acousto-optic alarm module, the fan fault detection module comprises a current/voltage conversion module and a signal processing module, the current/voltage conversion module is electrically connected with the signal processing module, the signal processing module is electrically connected with the microprocessor, the fan working circuit comprises a fan power supply circuit and a start-stop control circuit, the fan power supply circuit forms a power supply loop, the start-stop control circuit is electrically connected with the microprocessor and comprises a relay, the relay is provided with a relay coil and a relay normally open contact, the current/voltage conversion module and the normally open contact of the relay are connected in series in the power supply loop, and the sound and light alarm module is electrically connected with the microprocessor.
Preferably, the fan power supply circuit comprises an alternating current power supply and a fan, the current/voltage conversion module is provided with a first end and a second end, the first end of the fan is electrically connected with a zero line end of the alternating current power supply, the second end of the fan is electrically connected with a first end of a normally open contact of the relay, the second end of the normally open contact of the relay is electrically connected with a second end of the current/voltage conversion module, and the first end of the current/voltage conversion module is electrically connected with a live wire end of the alternating current power supply.
Preferably, the signal processing module includes a resistor R1 and a photo coupler, a first end of the current/voltage conversion module is electrically connected to a first end of the resistor R1, a second end of the resistor R1 is electrically connected to a first input pin of the photo coupler, a second input pin of the photo coupler is electrically connected to a second end of the current/voltage conversion module, a first output pin of the photo coupler is connected to DC5V, and a second output pin of the photo coupler is electrically connected to an I/O port of the microprocessor.
Preferably, the current/voltage conversion module comprises a diode D1, a diode D2 and a diode D3, wherein the anode of the diode D1 is shorted with the cathode of the diode D2 to form the first end of the current/voltage conversion module, the cathode of the diode D1 is electrically connected with the anode of the diode D3, and the cathode of the diode D3 is shorted with the anode of the diode D2 to form the second end of the current/voltage conversion module.
Preferably, the current/voltage conversion module adopts a zener diode D4, a cathode of the zener diode D4 forms a first end of the current/voltage conversion module, and an anode of the zener diode D4 forms a second end of the current/voltage conversion module.
Preferably, the signal processing module further includes an RC filtering module, the RC filtering module includes a resistor R2 and a capacitor C1, the second output pin of the photocoupler is electrically connected to the first end of the resistor R2, the second end of the resistor R2 is electrically connected to the first end of the capacitor C1, the second end of the capacitor C1 is grounded, and the second end of the resistor R2 is further electrically connected to an I/O port of the microprocessor.
Preferably, the start-stop control circuit further includes a transistor Q1 and a diode D5, the first end of the relay coil is connected to DC12V, the negative electrode of the diode D5 is electrically connected to the first end of the relay coil, the second end of the relay coil is electrically connected to the positive electrode of the diode D5 and the C electrode of the transistor Q1, the E electrode of the transistor Q1 is grounded, and the B electrode of the transistor Q1 is electrically connected to an I/O port of the microprocessor.
Preferably, the photocoupler adopts LTV-357T.
Preferably, the sound and light alarm module adopts a sound and light alarm element, and the sound and light alarm element is electrically connected with the microprocessor.
In conclusion, the beneficial effects of the utility model are as follows:
1. the fan power supply circuit is used for forming a power supply loop to supply power to the fan, the start-stop control circuit is used for controlling the start and stop of the fan, when the temperature of the dry type transformer temperature controller is detected to be overhigh, the microprocessor in the temperature controller controls to switch on a relay coil in the start-stop control circuit, the relay coil is electrified to close a normally open contact of the relay, the fan is switched on to supply power, the transformer is subjected to heat dissipation treatment, after the fan works, a current/voltage conversion module in the power supply loop starts to output a voltage signal when current flows, the signal processing module detects the signal and transmits the signal to the microprocessor for judgment after processing, if the signal comes, the fan works normally, if no signal comes, the fan works, if no signal comes, the sound-light alarm module is controlled to alarm, compared with the prior art, according to the technical scheme, the same effect is achieved, and meanwhile, a mutual inductor with high cost and overlarge volume is not required, so that the cost and the occupation of the space of the circuit board are greatly reduced, the flexibility of the layout of the circuit board is greatly improved, and the actual use requirement can be better met;
2. the signal processing module comprises a resistor R1 and a photoelectric coupler, the resistor R1 is a current-limiting resistor, the photoelectric coupler can effectively play an isolation role, when current flows through the current/voltage conversion module in the power supply loop, a voltage signal starts to be output, the voltage supplies power to a light-emitting diode in the photoelectric coupler through the current-limiting resistor R1, the triode side of the photoelectric coupler is enabled to be conducted, 5V voltage is output, a pull-up signal with 5V voltage is obtained from the I/O port of the microprocessing, and the microprocessor judges whether the fan is in normal operation or not according to the signal;
3. the first current/voltage conversion module comprises a diode D1, a diode D2 and a diode D3, the characteristic that voltage drop is generated when the diode is conducted is skillfully utilized, the diode is used as a current/voltage conversion element, the second current/voltage conversion module adopts a voltage stabilizing diode D4, the characteristic that the voltage stabilizing diode is in a PN junction reverse breakdown state is skillfully utilized, current can change in a large range and voltage is basically unchanged, the current/voltage conversion module is used as a current/voltage conversion element, the current/voltage conversion modules with the two structures can effectively output voltage signals, and finally, the voltage is used as a signal to realize simple judgment on whether the fan is in fault or not.
The utility model is further described with reference to the following figures and detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a circuit of the present invention;
FIG. 2 is a schematic diagram of a cell circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a cell circuit according to a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 3 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 to 3, the fan fault detection circuit for a dry-type transformer temperature controller disclosed in this embodiment includes a microprocessor, a fan operating circuit, a fan fault detection module, and an acousto-optic alarm module, where the fan fault detection module includes a current/voltage conversion module and a signal processing module, the current/voltage conversion module is electrically connected to the signal processing module, the signal processing module is electrically connected to the microprocessor, the fan operating circuit includes a fan power supply circuit and a start/stop control circuit, the fan power supply circuit forms a power supply loop, the start/stop control circuit is electrically connected to the microprocessor, the start/stop control circuit includes a relay RLY1, the relay RLY1 includes a relay coil and a relay normally open contact, the current/voltage conversion module and the relay normally open contact are both connected in series in the power supply loop, and the sound and light alarm module is electrically connected with the microprocessor. In the technical scheme, a fan power supply circuit is used for forming a power supply loop to supply power to a fan M, a start-stop control circuit is used for controlling the start and stop of the fan M, when a dry-type transformer temperature controller detects that the temperature of a transformer is overhigh, a microprocessor in the temperature controller controls to switch on a relay coil in the start-stop control circuit, the relay coil is electrified to close a normally open contact of a relay, so that the fan M is switched on to supply power, the transformer is subjected to heat dissipation treatment, when a current/voltage conversion module in the power supply loop flows current after the fan M works, a voltage signal is output, the signal processing module detects the signal and transmits the processed signal to the microprocessor for judgment, when the signal comes, the fan M is in normal work, and when the signal does not come, the fan M is in a fault state, and at the moment, an acousto-optic alarm module is controlled to drive to give an alarm, compared with the prior art, the technical scheme of the utility model realizes the same effect, and simultaneously does not need to arrange a mutual inductor with high cost and overlarge volume, thereby greatly reducing the cost and the occupation of the space of the circuit board, greatly improving the flexibility of the layout of the circuit board and further better meeting the actual use requirement. The microprocessor adopts a singlechip in specific implementation, belongs to the prior art, and is not specifically described herein.
As a preferred technical scheme, the fan power supply circuit includes an ac power supply and a fan M, the current/voltage conversion module has a first end and a second end, the first end of the fan M is electrically connected to a zero line end of the ac power supply, the second end of the fan M is electrically connected to a first end of a normally open contact of the relay, the second end of the normally open contact of the relay is electrically connected to a second end of the current/voltage conversion module, and the first end of the current/voltage conversion module is electrically connected to a live wire end of the ac power supply. In this embodiment, the alternating current power supply adopts 220V mains supply, the fan M adopts an alternating current heat dissipation fan M, the fan power supply circuit adopts the above structure to form a power supply loop well to supply power to the fan M, and the fan M is powered after the relay RLY1 is pulled in. During specific implementation, the power supply can also adopt a direct-current power supply, the fan M correspondingly adopts the direct-current fan M, and the circuit structure needs to be simply adjusted and is not further explained here.
Preferably, the signal processing module comprises a resistor R1 and a photo coupler LTV-357T, a first end of the current/voltage conversion module is electrically connected to a first end of the resistor R1, a second end of the resistor R1 is electrically connected to a first input pin of the photo coupler LTV-357T, a second input pin of the photo coupler LTV-357T is electrically connected to a second end of the current/voltage conversion module, a first output pin of the photo coupler LTV-357T is connected to DC5V, and a second output pin of the photo coupler LTV-357T is electrically connected to an I/O port of the microprocessor. In this embodiment, the resistor R1 is a current-limiting resistor, the photocoupler LTV-357T can effectively perform an isolation function, the current/voltage conversion module in the power supply loop starts to output a voltage signal when current flows, the voltage supplies power to the light emitting diode in the photocoupler LTV-357T through the current-limiting resistor R1, and the triode side of the photocoupler LTV-357T is activated to conduct, and output 5V voltage, so that the microprocessor obtains a pull-up signal of 5V voltage from the I/O port of the microprocessor, and the microprocessor determines whether the fan M is in normal operation according to the signal. The photocoupler LTV-357T belongs to the prior art and is not specifically described herein.
As a first preferred technical solution, the current/voltage conversion module includes a diode D1, a diode D2, and a diode D3, wherein the anode of the diode D1 is shorted with the cathode of the diode D2 to form a first end of the current/voltage conversion module, the cathode of the diode D1 is electrically connected with the anode of the diode D3, and the cathode of the diode D3 is shorted with the anode of the diode D2 to form a second end of the current/voltage conversion module. In this embodiment, when the ac power supplied to the fan M is in the negative half cycle, the diode D2 is turned on to supply power to the fan M, and when the ac power is in the positive half cycle, the diodes D1 and D3 are turned on to supply power to the fan M, and after the diodes D1 and D3 are turned on, a forward voltage drop of about 1.2V is generated, and this voltage supplies power to the light emitting diode in the optical coupler through the current limiting resistor R1, and causes the triode side of the optical coupler to be turned on, and a voltage of 5V is output. IN specific implementation, the diode D1, the diode D2 and the diode D3 all adopt IN4007, and belong to the prior art.
Preferably, as a second technical solution, the current/voltage conversion module adopts a zener diode D4, a cathode of the zener diode D4 forms a first end of the current/voltage conversion module, and an anode of the zener diode D4 forms a second end of the current/voltage conversion module. The second technical solution of this embodiment skillfully utilizes the characteristic that the current can change in a large range and the voltage is substantially unchanged when the zener diode D4 is in a PN junction reverse breakdown state, and uses it as a current/voltage conversion element, and finally uses this voltage as a signal to realize a simple judgment of whether the fan M is faulty or not.
Preferably, the signal processing module further includes an RC filtering module, the RC filtering module includes a resistor R2 and a capacitor C1, a second output pin of the photocoupler LTV-357T is electrically connected to a first end of the resistor R2, a second end of the resistor R2 is electrically connected to a first end of the capacitor C1, a second end of the capacitor C1 is grounded, and a second end of the resistor R2 is further electrically connected to an I/O port of the microprocessor. In this embodiment, since the power supplied by the fan M is ac power, the voltage drop generated across the diodes D1 and D3 is a pulsating voltage, and therefore the 5V output of the photocoupler LTV-357T is also pulsating, and here, the pre-filtering is performed by the RC filtering module composed of the resistor R2 and the capacitor C1, and then the pre-filtering is supplied to the microprocessor for determination, and the signal filtered by the RC filtering module can be more convenient for the microprocessor to determine.
Preferably, the start-stop control circuit further includes a transistor Q1 and a diode D5, the first end of the relay coil is connected to DC12V, the negative electrode of the diode D5 is electrically connected to the first end of the relay coil, the second end of the relay coil is electrically connected to the positive electrode of the diode D5 and the C electrode of the transistor Q1, the E electrode of the transistor Q1 is grounded, and the B electrode of the transistor Q1 is electrically connected to an I/O port of the microprocessor. In this embodiment, when the dry-type transformer needs to dissipate heat, the microprocessor outputs a relay RLY1 driving signal through the I/O port to turn on the transistor Q1, and turns on the subsequent electric appliance coil to obtain 12V power supply to pull in the normally open contact of the relay, and the fan M obtains power supply after the relay RLY1 pulls in, and the diode D5 is a clamp diode to clamp the reverse electromotive force generated when the relay coil is powered off to prevent the reverse electromotive force from exceeding the withstand voltage of the transistor Q1 and breaking down the transistor Q1.
Preferably, LTV-357T is adopted as the photoelectric coupler LTV-357T. In this embodiment, the photocoupler LTV-357T is LTV-357T, which can effectively perform an isolation function, and the photocoupler LTV-357T is not limited to LTV-357T, and can be adjusted according to actual requirements, which is not further described herein. The LTV-357T belongs to the prior art and is not specifically described herein.
As a preferable technical scheme, the sound and light alarm module adopts a sound and light alarm element, and the sound and light alarm element is electrically connected with the microprocessor. In this embodiment, the sound-light alarm element is configured to send out a sound-light alarm, which is referred to in the prior art and will not be further described herein, if the microprocessor outputs a fan M start signal but does not receive a fan M working signal, it is determined that the fan M is in failure, and the microprocessor drives the sound-light alarm element to send out the sound-light alarm to notify a manager to perform maintenance in time. The sound and light alarm module can refer to the prior art and is not further described herein.
The working mode is as follows: when the temperature controller of the dry type transformer detects that the temperature of the transformer is overhigh, a microprocessor in the temperature controller controls to switch on a relay coil in a start-stop control circuit, the relay coil is electrified to close a normally open contact of a relay, and then a fan M is switched on to supply power to carry out heat dissipation treatment on the transformer, after the fan M works, a current/voltage conversion module in a power supply loop starts to output a voltage signal when current flows, the voltage supplies power to a light emitting diode in an optoelectronic coupler LTV-357T through a current limiting resistor R1, and enables a triode side of the optoelectronic coupler LTV-357T to be conducted, 5V voltage is output, a pull-up signal with 5V voltage is obtained from an I/O port of the microprocessor, the microprocessor judges whether the fan M works normally according to the signal, and if the signal comes, the fan M works normally, no signal comes then to explain that fan M is in the fault condition, is sent audible-visual alarm by microprocessor drive audible-visual alarm component this moment, informs the managers in time to overhaul, and above-mentioned technical scheme in-service use is effectual, need not to set up with high costs and bulky mutual-inductor to this by a wide margin the cost is reduced and to circuit board space's occupation, has improved the flexibility of circuit board overall arrangement greatly, and then can satisfy the in-service use demand better.
The skilled person should understand that: although the present invention has been described in terms of the above embodiments, the inventive concept is not limited to this embodiment, and any modification which uses the inventive concept is intended to be included within the scope of the appended claims.
Claims (9)
1. The utility model provides a dry-type transformer temperature controller fan fault detection circuit which characterized in that: including microprocessor, fan operating circuit, fan fault detection module and audible-visual annunciator module, fan fault detection module includes electric current/voltage conversion module and signal processing module, electric current/voltage conversion module is connected with signal processing module electricity, signal processing module with microprocessor electricity is connected, fan operating circuit includes fan supply circuit and opens and stop control circuit, fan supply circuit forms power supply loop, open and stop control circuit and be connected with microprocessor electricity, open and stop control circuit and include the relay, the relay has relay coil and relay normally open contact, electric current/voltage conversion module and relay normally open contact all establish ties in the power supply loop, audible-visual annunciator module is connected with microprocessor electricity.
2. The fan fault detection circuit of a dry-type transformer temperature controller according to claim 1, characterized in that: the fan power supply circuit comprises an alternating current power supply and a fan, the current/voltage conversion module is provided with a first end and a second end, the first end of the fan is electrically connected with a zero line end of the alternating current power supply, the second end of the fan is electrically connected with a first end of a normally open contact of the relay, the second end of the normally open contact of the relay is electrically connected with a second end of the current/voltage conversion module, and the first end of the current/voltage conversion module is electrically connected with a live wire end of the alternating current power supply.
3. The fan fault detection circuit of a dry-type transformer temperature controller according to claim 2, characterized in that: the signal processing module comprises a resistor R1 and a photoelectric coupler, the first end of the current/voltage conversion module is electrically connected with the first end of the resistor R1, the second end of the resistor R1 is electrically connected with the first input pin of the photoelectric coupler, the second input pin of the photoelectric coupler is electrically connected with the second end of the current/voltage conversion module, the first output pin of the photoelectric coupler is connected with DC5V, and the second output pin of the photoelectric coupler is electrically connected with an I/O port of the microprocessor.
4. The dry-type transformer temperature controller fan fault detection circuit of claim 3, characterized in that: the current/voltage conversion module comprises a diode D1, a diode D2 and a diode D3, wherein the anode of the diode D1 is in short circuit with the cathode of the diode D2 to form a first end of the current/voltage conversion module, the cathode of the diode D1 is electrically connected with the anode of the diode D3, and the cathode of the diode D3 is in short circuit with the anode of the diode D2 to form a second end of the current/voltage conversion module.
5. The dry-type transformer temperature controller fan fault detection circuit of claim 3, characterized in that: the current/voltage conversion module adopts a voltage stabilizing diode D4, the cathode of a voltage stabilizing diode D4 forms the first end of the current/voltage conversion module, and the anode of a voltage stabilizing diode D4 forms the second end of the current/voltage conversion module.
6. The dry type transformer temperature controller fan fault detection circuit of claim 4 or 5, characterized in that: the signal processing module further comprises an RC filtering module, the RC filtering module comprises a resistor R2 and a capacitor C1, a second output pin of the photoelectric coupler is electrically connected with a first end of the resistor R2, a second end of the resistor R2 is electrically connected with a first end of the capacitor C1, a second end of the capacitor C1 is grounded, and a second end of the resistor R2 is further electrically connected with an I/O port of the microprocessor.
7. The dry-type transformer temperature controller fan fault detection circuit of claim 6, characterized in that: the start-stop control circuit further comprises a triode Q1 and a diode D5, the first end of the relay coil is connected with the DC12V, the cathode of the diode D5 is electrically connected with the first end of the relay coil, the second end of the relay coil is electrically connected with the anode of the diode D5 and the C electrode of the triode Q1, the E electrode of the triode Q1 is grounded, and the B electrode of the triode Q1 is electrically connected with an I/O port of the microprocessor.
8. The dry-type transformer temperature controller fan fault detection circuit of claim 7, characterized in that: the photoelectric coupler adopts LTV-357T.
9. The dry-type transformer temperature controller fan fault detection circuit of claim 8, characterized in that: the sound and light alarm module adopts a sound and light alarm element which is electrically connected with the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121903576.0U CN215524883U (en) | 2021-08-14 | 2021-08-14 | Dry-type transformer temperature controller fan fault detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121903576.0U CN215524883U (en) | 2021-08-14 | 2021-08-14 | Dry-type transformer temperature controller fan fault detection circuit |
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| Publication Number | Publication Date |
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| CN215524883U true CN215524883U (en) | 2022-01-14 |
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| CN202121903576.0U Active CN215524883U (en) | 2021-08-14 | 2021-08-14 | Dry-type transformer temperature controller fan fault detection circuit |
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