CN217846540U - Fan fault detection circuit and clothes dryer - Google Patents
Fan fault detection circuit and clothes dryer Download PDFInfo
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- CN217846540U CN217846540U CN202220996713.8U CN202220996713U CN217846540U CN 217846540 U CN217846540 U CN 217846540U CN 202220996713 U CN202220996713 U CN 202220996713U CN 217846540 U CN217846540 U CN 217846540U
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Abstract
The utility model discloses a fan fault detection circuit and dryer, fan fault detection circuit is used for being connected with the fan, and wherein, fan fault detection circuit includes: the device comprises a voltage division circuit, a first filter circuit, a switch circuit, a second filter circuit, a detection port and a control unit. The voltage division circuit, the first filter circuit, the switch circuit and the second filter circuit are all connected with the same point and grounded; when the control unit detects that the output of the detection port is a level signal, the voltage division circuit, the first filter circuit, the second filter circuit and the switch circuit are not conducted, and the fan is normal; when the control unit detects that the output of the detection port is a square wave signal, the current sequentially passes through the voltage division circuit, the first filter circuit and the second filter circuit, and the on and off of the switch circuit are triggered periodically, so that the fan breaks down. The utility model discloses when the fan became invalid, can make the compressor close in advance to guarantee the life-span of compressor and avoid the compressor to damage.
Description
Technical Field
The utility model relates to a fan fault detection technical field, in particular to fan fault detection circuit and dryer.
Background
At present, clothes dryers on the market can not effectively detect failures such as damage or locked rotor of an overheated fan of a protection compressor, and only can passively protect the internal temperature of the compressor through a heat protector of the compressor, so that certain time lag and time delay exist, and if the fan of the clothes dryer is locked rotor or fails in a short time in the operation process, the compressor can have the condition that the compressor is damaged due to overheating work for a period of time.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's weak point, an object of the utility model is to provide a fan fault detection circuit and dryer aims at solving the problem that the fan broke down and can't in time detect among the prior art.
In order to achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, an embodiment of the present invention provides a fan fault detection circuit for be connected with a fan, wherein, fan fault detection circuit includes: the fan comprises a voltage division circuit connected with the fan, a first filter circuit connected with the voltage division circuit, a switch circuit connected with the first filter circuit, a second filter circuit connected with the switch circuit, a detection port connected with the second filter circuit and a control unit connected with the detection port and used for detecting the output voltage of the detection port;
the voltage division circuit, the first filter circuit, the switch circuit and the second filter circuit are all connected with the same point and grounded;
when the control unit detects that the output of the detection port is a level signal, the voltage division circuit, the first filter circuit, the second filter circuit and the switch circuit are not conducted;
when the control unit detects that the output of the detection port is a square wave signal, the current sequentially passes through the voltage division circuit, the first filter circuit and the second filter circuit and periodically triggers the on and off of the switch circuit.
As a further improved technical solution, in the fan fault detection circuit, the voltage dividing circuit includes:
a first resistor, a second resistor and a third resistor;
one end of the first resistor is connected with the fan, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, and the other end of the third resistor is grounded.
As a further improved technical solution, in the fan fault detection circuit, the first filter circuit includes:
a fourth resistor and a first capacitor;
one end of the fourth resistor is connected with one end of the third resistor, the other end of the fourth resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded with the other end of the third resistor.
As a further improved technical solution, in the fan fault detection circuit, the switching circuit includes:
the triode and the fifth resistor;
the base electrode of the triode is connected with the other end of the fourth resistor and one end of the first capacitor, the emitting electrode of the triode is connected with the other end of the first capacitor, the collecting electrode of the triode is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with an external power supply.
As a further improved technical solution, in the fan fault detection circuit, the second filter circuit includes:
a sixth resistor and a second capacitor;
one end of the sixth resistor is connected with one end of the fifth resistor, the other end of the sixth resistor is connected with one end of the second capacitor and the detection port, and the other end of the second capacitor is grounded with the emitting electrode of the triode.
As a further improved technical solution, in the fan fault detection circuit, the fan fault detection circuit further includes a zener diode, one end of the zener diode is connected to the other end of the second resistor and one end of the third resistor, and the other end of the zener diode is grounded to the other end of the third resistor.
As a further improved technical solution, in the fan fault detection circuit, the voltage of the external power supply is 5V.
As a further improved technical scheme, in the fan fault detection circuit, the triode is an NPN-type triode.
In a second aspect, an embodiment of the present invention provides a clothes dryer, including a blower, a compressor control module and a compressor; the fan fault detection circuit is connected with the fan and the compressor control module respectively.
The utility model discloses the technical scheme who adopts has following beneficial effect:
the utility model provides a fan fault detection circuit and dryer, fan fault detection circuit is used for being connected with the fan, wherein, fan fault detection circuit includes: the fan comprises a voltage division circuit connected with the fan, a first filter circuit connected with the voltage division circuit, a switch circuit connected with the first filter circuit, a second filter circuit connected with the switch circuit, a detection port connected with the second filter circuit and a control unit connected with the detection port. The voltage division circuit, the first filter circuit, the switch circuit and the second filter circuit are all connected with the same point and grounded; when the control unit detects that the output of the detection port is a level signal, the voltage division circuit, the first filter circuit, the second filter circuit and the switch circuit are not conducted, and the control unit judges that the fan is normal; when the control unit detects that the output of the detection port is a square wave signal, the current sequentially passes through the voltage division circuit, the first filter circuit and the second filter circuit and periodically triggers the on and off of the switch circuit, and the control unit judges the fan fault. The utility model discloses a signal type to detecting the mouth output detects, can be effectual the good or bad of judgement fan to when the fan became invalid, the compressor can be closed in advance, and the fan resumes back compressor and resumes work at once, thereby guarantees the life-span of compressor and avoids the compressor to damage.
Drawings
Fig. 1 is a circuit diagram of a fan fault detection circuit provided by the present invention;
fig. 2 is a block diagram of a clothes dryer provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should be further noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations of the present patent, and specific meanings of the above terms can be understood according to specific situations by those of ordinary skill in the art.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The first embodiment is as follows:
the utility model discloses a fan fault detection circuit, figure 1 does the utility model provides a pair of fan fault detection circuit's circuit diagram. The utility model discloses a fan fault detection circuit is used for being connected with fan 10, fan 10 is connected with commercial power live wire L, and is specific fan fault detection circuit includes: the fan voltage detection device comprises a voltage division circuit 100 connected with the fan 10, a first filter circuit 200 connected with the voltage division circuit 100, a switch circuit 300 connected with the first filter circuit 200, a second filter circuit 400 connected with the switch circuit 300, a detection port 500 connected with the second filter circuit 400 and a control unit 600 connected with the detection port 500 and used for detecting the type of voltage output by the detection port 500; the voltage dividing circuit 100, the first filter circuit 200, the switch circuit 300 and the second filter circuit 400 are all connected to the same point of ground GND, the zero line N of the commercial power and the ground GND of the circuit are common, that is, the ground GND of the whole circuit is the zero line N of the commercial power; the first filter circuit 200 can filter the interference of strong current (220V), and the second filter circuit 400 can filter the interference of the detection port 500;
specifically, in actual use, when the control unit 600 detects that the output of the detection port 500 is a level signal, the voltage dividing circuit 100, the first filter circuit 200, the second filter circuit 400 and the switch circuit 300 are not turned on, and the control unit 600 determines that the fan 10 is normal; when the control unit 600 detects that the output of the detection port 500 is a square wave signal, the current sequentially passes through the voltage dividing circuit 100, the first filter circuit 200 and the second filter circuit 400, and periodically triggers the on and off of the switch circuit 300, and the control unit 600 determines that the fan 10 has a fault.
The working principle of the fan fault detection circuit provided by the embodiment is as follows: referring to fig. 1, when the zero line of the fan 10 is suspended, the fan 10 is connected to the live line L of the commercial power, the fan is not started, the voltage at the point a is 220V alternating current transmitted from the live line L of the commercial power through the coil of the fan 10, and the 220V alternating current is between the point a and the GND (N); at this time, 220V alternating current is accessed to the fan 10 and is subjected to voltage division sequentially through the voltage division circuit 100, a waveform with a 20ms period and a duty ratio approximate to 50% is formed, the on and off of the switch circuit 300 is triggered periodically after the filtering of the first filter circuit 200, the period is 20ms, finally, a square wave with a frequency of 50Hz (20 ms period) is input to the detection port 500 after the filtering of the second filter circuit 400, the detection port 500 outputs a square wave signal, and the control unit detects that the fan 10 is not started at this time and judges that the fan is in a fault state; the control unit 600 controls the compressor to stop operating.
When the zero line of the fan is connected with the commercial power zero line N, the fan starts to rotate, and the point A and the GND (N) are at the same potential. The voltage dividing circuit 100, the first filter circuit 200, the switch circuit 300 and the second filter circuit 400 are all not turned on, the detection port 500 outputs a high level signal, and the control unit 600 detects that the fan is started at the moment and judges that the fan is in a normal state; the control unit 600 controls the compressor to be normally operated.
The fan fault detection circuit that this embodiment provided's beneficial effect lies in at least: the action of the fan is detected, the quality of the fan can be effectively judged, the compressor can be closed in advance when the fan fails, and the compressor can be restored to work immediately after the fan is restored, so that the service life of the compressor is guaranteed, and the compressor is prevented from being damaged.
As a further alternative, with continued reference to fig. 1, the voltage divider circuit 100 includes: a first resistor R1, a second resistor R2 and a third resistor R3; specifically, first resistance R1, second resistance R2 and third resistance R3 play the partial pressure effect, first resistance R1's one end with the fan is connected, first resistance R1's the other end with second resistance R2's one end is connected, second resistance R2's the other end with third resistance R3's one end is connected, third resistance R3's other end ground connection GND.
As a further scheme, the first filter circuit 200 includes: a fourth resistor R4 and a first capacitor C1; one end of the fourth resistor R4 is connected with one end of the third resistor R3, the other end of the fourth resistor R4 is connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded GND (ground) with the other end of the third resistor R3.
As a further alternative, with continued reference to fig. 1, the switch circuit 300 includes: a triode Q1 and a fifth resistor R5; the base electrode of the triode Q1 is connected with the other end of the fourth resistor R4 and one end of the first capacitor C1, the emitting electrode of the triode Q1 is connected with the other end of the first capacitor C1, the collecting electrode of the triode Q1 is connected with one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected with an external power supply, and optionally, the voltage of the external power supply is 5V. The triode Q1 plays a role in switching. The strong sine wave is converted into square wave through a switching triode Q1. Optionally, the triode Q1 is an NPN-type triode Q1; the fifth resistor R5 is a pull-up resistor, and provides a high level signal to the control unit 600 when the transistor Q1 is not turned on. When the transistor Q1 is turned on, the control unit 600 obtains a low level signal. This allows the control unit 600 to distinguish between conducting and non-conducting states of the transistor Q1.
As a further alternative, with continued reference to fig. 1, the second filter circuit 400 includes: a sixth resistor R6 and a second capacitor C2; one end of the sixth resistor R6 is connected to one end of the fifth resistor R5, the other end of the sixth resistor R6 is connected to one end of the second capacitor C2 and the detection port 500, and the other end of the second capacitor C2 is grounded to the emitter of the transistor Q1.
As a further solution, please continue to refer to fig. 1, the fan fault detection circuit further includes a zener diode DZ1, one end of the zener diode DZ1 is connected to the other end of the second resistor R2 and one end of the third resistor R3, and the other end of the zener diode DZ1 and the other end of the third resistor R3 are grounded to GND; when the mains supply fluctuates instantaneously, the voltage stabilizing diode DZ1 can clamp the instantaneous high voltage to 5.1V to protect the following circuit.
It is right to combine specific experimental scene below the embodiment of the utility model provides an in the structure of fan fault detection circuit and function do detailed description:
when the zero line of the fan 10 is suspended, the fan 10 is connected to the live line L of the commercial power, the fan is not started, the voltage of the point A is 220V alternating current transmitted by the live line L of the commercial power through the coil of the fan 10, and the 220V alternating current is formed between the point A and GND (N); at this time, 220V alternating current is accessed to the fan 10 and is subjected to voltage division sequentially through the first resistor R1, the second resistor R2 and the third resistor R3 to form a waveform with a 20ms period and a duty ratio of approximately 50%, the on and off of the triode Q1 is triggered periodically after filtering through the fourth resistor R4 and the first capacitor C1, the period is 20ms, and finally the triode Q1 is pulled up by the fifth resistor R5, and a square wave with a frequency of 50Hz (20 ms period) is input to the detection port 500 after filtering through the sixth resistor R6 and the second capacitor C2, so that the detection port 500 outputs a square wave signal, and the control unit 600 detects that the fan is not started at this time and judges that the fan is in a fault state; the control unit 600 controls the compressor to stop operating.
When the zero line of the fan is connected with the commercial power zero line N, the fan starts to rotate, and the point A and the GND (N) are at the same potential. The voltage dividing circuit 100, the first filter circuit 200, the switch circuit 300 and the second filter circuit 400 are all non-conductive, the detection port 500 outputs a high level signal, and the control unit 600 detects that the fan is started at the moment and judges that the fan is in a normal state; the control unit 600 controls the compressor to normally operate.
Example two:
referring to fig. 2, fig. 2 is a block diagram of a clothes dryer according to the present invention. The embodiment of the utility model also provides a clothes dryer, which comprises a fan 10, a compressor control module 20 and a compressor 30; the fan fault detection circuit 40 is further included, and the fan fault detection circuit 40 is respectively connected with the fan 10 and the compressor control module 20. Through fan fault detection circuit detects the action of fan, can effectual judgement fan good or bad to give compressor control module with the testing result feedback, make when the fan became invalid, the compressor can be closed in advance, and the compressor resumes work at once after the fan resumes, thereby guarantees the life-span of compressor and avoids the compressor to damage.
To sum up, the utility model provides a fan fault detection circuit and dryer, wherein, fan fault detection circuit is used for being connected with the fan, wherein, fan fault detection circuit includes: the fan comprises a voltage division circuit connected with the fan, a first filter circuit connected with the voltage division circuit, a switch circuit connected with the first filter circuit, a second filter circuit connected with the switch circuit, a detection port connected with the second filter circuit and a control unit connected with the detection port. The voltage division circuit, the first filter circuit, the switch circuit and the second filter circuit are all connected with the same point and grounded; when the control unit detects that the output of the detection port is a level signal, the voltage division circuit, the first filter circuit, the second filter circuit and the switch circuit are not conducted, and the fan is normal; when the control unit detects that the output of the detection port is a square wave signal, the current sequentially passes through the voltage division circuit, the first filter circuit and the second filter circuit, and the on and off of the switch circuit are triggered periodically, so that the fan breaks down. The utility model discloses a signal type to detecting the mouth output detects, can be effectual the good or bad of judgement fan to when the fan became invalid, the compressor can be closed in advance, and the fan resumes back compressor and resumes work at once, thereby guarantees the life-span of compressor and avoids the compressor to damage.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (9)
1. The utility model provides a fan fault detection circuit for be connected with the fan, its characterized in that, fan fault detection circuit includes: the fan comprises a voltage division circuit connected with the fan, a first filter circuit connected with the voltage division circuit, a switch circuit connected with the first filter circuit, a second filter circuit connected with the switch circuit, a detection port connected with the second filter circuit and a control unit connected with the detection port and used for detecting the output voltage of the detection port;
the voltage division circuit, the first filter circuit, the switch circuit and the second filter circuit are all connected with the same point and grounded;
when the control unit detects that the output of the detection port is a level signal, the voltage division circuit, the first filter circuit, the second filter circuit and the switch circuit are not conducted;
when the control unit detects that the output of the detection port is a square wave signal, the current sequentially passes through the voltage division circuit, the first filter circuit and the second filter circuit and periodically triggers the on and off of the switch circuit.
2. The fan fault detection circuit of claim 1, wherein the voltage divider circuit comprises:
a first resistor, a second resistor and a third resistor;
one end of the first resistor is connected with the fan, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the third resistor, and the other end of the third resistor is grounded.
3. The fan fault detection circuit of claim 2, wherein the first filter circuit comprises:
a fourth resistor and a first capacitor;
one end of the fourth resistor is connected with one end of the third resistor, the other end of the fourth resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded with the other end of the third resistor.
4. The fan fault detection circuit of claim 3, wherein the switching circuit comprises:
the triode and the fifth resistor;
the base electrode of the triode is connected with the other end of the fourth resistor and one end of the first capacitor, the emitting electrode of the triode is connected with the other end of the first capacitor, the collecting electrode of the triode is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with an external power supply.
5. The fan fault detection circuit of claim 4, wherein the second filter circuit comprises:
a sixth resistor and a second capacitor;
one end of the sixth resistor is connected with one end of the fifth resistor, the other end of the sixth resistor is connected with one end of the second capacitor and the detection port, and the other end of the second capacitor is grounded with the emitting electrode of the triode.
6. The fan failure detection circuit according to claim 2, further comprising a zener diode, one end of the zener diode being connected to the other end of the second resistor and one end of the third resistor, the other end of the zener diode being grounded to the other end of the third resistor.
7. The fan failure detection circuit of claim 4, wherein the voltage of the external power supply is 5V.
8. The fan fault detection circuit according to claim 4, wherein the transistor is an NPN transistor.
9. A clothes dryer comprises a fan, a compressor control module and a compressor; the fan failure detection circuit of any one of claims 1-8, further comprising a fan failure detection circuit connected to the fan and the compressor control module, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220996713.8U CN217846540U (en) | 2022-04-27 | 2022-04-27 | Fan fault detection circuit and clothes dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220996713.8U CN217846540U (en) | 2022-04-27 | 2022-04-27 | Fan fault detection circuit and clothes dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217846540U true CN217846540U (en) | 2022-11-18 |
Family
ID=84017382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220996713.8U Active CN217846540U (en) | 2022-04-27 | 2022-04-27 | Fan fault detection circuit and clothes dryer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217846540U (en) |
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2022
- 2022-04-27 CN CN202220996713.8U patent/CN217846540U/en active Active
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