CN214577875U - Fan fault detection circuit and device - Google Patents
Fan fault detection circuit and device Download PDFInfo
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- CN214577875U CN214577875U CN202120660862.2U CN202120660862U CN214577875U CN 214577875 U CN214577875 U CN 214577875U CN 202120660862 U CN202120660862 U CN 202120660862U CN 214577875 U CN214577875 U CN 214577875U
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Abstract
The utility model relates to a fault detection circuit technical field discloses a fan fault detection circuit and device. The circuit comprises: the fan fault detection device comprises a voltage detection module, a current detection module and a fault detection module, wherein the current detection module detects the current of the fan and outputs a current fault signal when the current is smaller than a preset current; the voltage detection module detects the current voltage of the fan and outputs a voltage fault signal when the current voltage exceeds a preset voltage range; and the fault detection module generates a fan fault prompt signal and outputs the fan fault prompt signal when receiving the current fault signal and the voltage fault signal. The utility model discloses a carry out real-time detection to current voltage and current electric current to produce fan trouble cue signal when the two is all in abnormal state, prevented fan fault detection misstatement, simultaneously, the utility model discloses the good interference killing feature of circuit stability is stronger.
Description
Technical Field
The utility model relates to a fault detection circuit technical field especially relates to a fan fault detection circuit and device.
Background
In the air cooling equipment, the working state of a fan needs to be detected in real time; in a high-power pulse circuit, strong electromagnetic interference exists, a fault detection circuit of the fan is easily interfered by the electromagnetic interference to generate false alarm, but the cost of the fan with the fault detection circuit resisting the strong interference is expensive.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a fan fault detection circuit and device, which aims to solve the technical problem of the prior art that the anti-interference capability of the fault detection circuit of the fan is weak and the false alarm is easily generated.
In order to achieve the above object, the utility model provides a fan fault detection circuit, the circuit includes: the device comprises a voltage detection module, a current detection module and a fault detection module; the detection end of the voltage detection module is connected with one end of the fan, the detection end of the current detection module is connected with the other end of the fan, the output end of the current detection module is connected with one input end of the fault detection module, and the other input end of the fault detection module is connected with the output end of the voltage detection module;
the current detection module is used for detecting the current of the fan and outputting a current fault signal to the fault detection module when the current is smaller than a preset current;
the voltage detection module is used for detecting the current voltage of the fan and outputting a voltage fault signal to the fault detection module when the current voltage exceeds a preset voltage range;
the fault detection module is used for generating a fan fault prompt signal and outputting the fan fault prompt signal when receiving the current fault signal and the voltage fault signal.
Optionally, the current detection module includes a current comparison unit and a peripheral auxiliary unit; wherein,
the input end of the current comparison unit is connected with one end of the peripheral auxiliary unit, the output end of the current comparison unit is connected with one input end of the fault detection module, and the input end of the peripheral auxiliary unit is connected with the power supply end;
the peripheral auxiliary unit is used for connecting a fan;
the current comparison unit is used for receiving the current of the fan, comparing the current with the preset current, and outputting a current fault signal to the fault detection module when the current is smaller than the preset current.
Optionally, the current comparing unit includes first to seventh resistors, first to second capacitors, and a comparator; wherein,
the first end of the first resistor is connected with the reference voltage end, the second end of the first resistor is connected with the first end of the first capacitor, the first end of the second resistor and the first end of the fourth resistor, and the first capacitor is connected with the second end of the second resistor and grounded;
the second end of the fourth resistor is connected with the second end of the second capacitor and the inverting input end of the comparator, the non-inverting input end of the comparator is connected with the first end of the second capacitor, the second end of the third resistor and the first end of the fifth resistor, the first end of the third resistor is connected with the fan voltage end, and the output end of the comparator is connected with the second end of the fifth resistor, the second end of the sixth resistor and the first end of the seventh resistor;
and the first end of the sixth resistor is connected with the system voltage end, and the second end of the seventh resistor is connected with one input end of the fault detection module.
Optionally, the peripheral auxiliary unit includes an electrolytic capacitor, an eighteenth resistor, and first to second fan interfaces; wherein,
the first fan interface is connected with the second fan interface in parallel, the power supply ends are connected to the two ends of the first fan interface and the two ends of the second fan interface, the first end of the eighteenth resistor is connected with the negative end of the electrolytic capacitor, the positive end of the electrolytic capacitor is connected with one end of the first fan interface, and the second end of the eighteenth resistor is connected with the other end of the first fan interface.
Optionally, the voltage detection module includes a first chip, eighth to twelfth resistors, and a third capacitor; wherein,
a first end of an eighth resistor is connected with a fan voltage end, a second end of the eighth resistor is connected with a second end of a ninth resistor and a sixth pin of a first chip, a second end of the ninth resistor is connected with a first pin of the first chip, a second pin of the first chip is grounded, a first pin of the first chip is further connected with a first end of an eleventh resistor and a first end of a twelfth resistor, and a second end of the eleventh resistor is connected with a second end of the twelfth resistor and grounded;
a first end of a tenth resistor is connected with a fourth pin of the first chip, the reference voltage end and a first end of the third capacitor, a second end of the third capacitor is grounded, a second end of the tenth resistor is connected with the third pin of the first chip and the fifth pin of the first chip, and the third pin of the first chip is further connected with the other input end of the fault detection module.
Optionally, the fault detection module includes a voltage stabilization unit and a fault detection unit; the input end of the voltage stabilizing unit is connected with the power supply voltage end, the output end of the voltage stabilizing unit is connected with one end of the fault detection unit, one input end of the fault detection unit is connected with the output end of the voltage detection module, and one input end of the fault detection unit is connected with the output end of the current detection module.
Optionally, the fault detection unit includes: a photoelectric coupler, a first triode and thirteenth to fifteenth resistors; the photoelectric coupler comprises a photoelectric diode and a photosensitive triode;
the anode of the photodiode is connected with the second end of the seventh resistor, the cathode of the photodiode is connected with the collector of the first triode, the emitter of the first triode is connected with the second end of the thirteenth resistor and grounded, the base of the first triode is connected with the first end of the thirteenth resistor and the first end of the fourteenth resistor, and the second end of the fourteenth resistor is connected with the third pin of the first chip;
the base electrode of the phototriode is used for receiving light emitted by the photodiode, the emitting electrode of the phototriode is grounded, the collector electrode of the phototriode is connected with the first end of a fifteenth resistor, and the second end of the fifteenth resistor is connected with the reference voltage end.
Optionally, an input end of the voltage stabilizing unit is connected to one end of the fan, and an output end of the voltage stabilizing unit is connected to one end of the fault detection module; the voltage stabilizing unit comprises a fourth capacitor, a sixteenth resistor, a seventeenth resistor, a voltage stabilizing diode and a voltage stabilizer; wherein,
a first end of the sixteenth resistor is connected with a fan voltage end, a second end of the sixteenth resistor is connected with a gate level of the voltage stabilizer and a second end of the fourth capacitor, and a first end of the fourth capacitor is connected with an anode of the voltage stabilizing diode and a cathode of the voltage stabilizer;
and the first end of the seventeenth resistor is connected with the gate level of the voltage stabilizer, and the second end of the seventeenth resistor is connected with the anode of the voltage stabilizer and grounded.
Furthermore, in order to achieve the above object, the utility model discloses still provide a fan failure detection device, the device includes: the fan failure detection circuit as described above.
The utility model discloses a set up fan fault detection circuit, the circuit includes: the current detection module is used for detecting the current of the fan and outputting a current fault signal to the fault detection module when the current is smaller than a preset current; the voltage detection module is used for detecting the current voltage of the fan and outputting a voltage fault signal to the fault detection module when the current voltage exceeds a preset voltage range; the fault detection module is used for generating a fan fault prompt signal and outputting the fan fault prompt signal when receiving the current fault signal and the voltage fault signal. Through carrying out real-time detection to current voltage and current electric current to produce fan trouble cue signal when the two is all in abnormal state, prevented that fan fault detection misstatement, simultaneously, the utility model discloses the good interference killing feature of circuit stability is stronger.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, 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 the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a fan fault detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the fan fault detection circuit of the present invention;
fig. 3 is a schematic circuit diagram of a peripheral auxiliary unit according to an embodiment of the fan fault detection circuit of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
It should be noted that, in the practical application of the present invention, the software program is inevitably applied, but the applicant states here that the software program applied in the technical solution is the prior art, and in the present application, the modification and protection of the software program are not involved, but only the protection of the hardware architecture designed to solve the technical problem of the present invention.
Referring to fig. 1, fig. 1 is a schematic block diagram of a fan fault detection circuit according to an embodiment of the present invention;
the circuit comprises: a voltage detection module 200, a current detection module 100 and a fault detection module 300; the detection end of the voltage detection module 200 is connected with one end of the fan, the detection end of the current detection module 100 is connected with the other end of the fan, the output end of the current detection module 100 is connected with one input end of the fault detection module 300, and the other input end of the fault detection module 300 is connected with the output end of the voltage detection module 200;
the current detection module 100 is configured to detect a current of the fan, and output a current fault signal to the fault detection module 300 when the current is smaller than a preset current;
it should be noted that the current detection module 100 at least includes a current comparator, one end of the current comparator is connected to a reference current input by the reference terminal, and the other end of the current comparator is connected to a current obtained by the detection terminal through detection, so as to compare the current with the reference current. The reference current is also the preset current, a reference voltage is input through a reference voltage source (or circuit), and the resistance value of the resistor in the current detection module 100 is adjusted according to actual requirements to obtain an ideal preset current according to the reference voltage.
The voltage detection module 200 is configured to detect a current voltage of the fan, and output a voltage fault signal to the fault detection module 300 when the current voltage exceeds a preset voltage range;
it should be noted that the voltage detection module 200 at least includes a voltage detection chip, one end of the voltage detection chip is connected to a reference voltage, and the other end of the voltage detection chip is connected to a current voltage obtained by detection of the detection end, a preset voltage range is generated according to the reference voltage and other devices in the voltage detection module 200, and whether the current voltage exceeds the preset voltage range (is greater than a highest value of the preset voltage range or is less than a lowest value of the preset voltage range) is determined, and the preset voltage range can be obtained by adjusting resistance values of the devices in the voltage detection module 200.
The fault detection module 300 is configured to generate a fan fault notification signal and output the fan fault notification signal when receiving the current fault signal and the voltage fault signal.
It is easy to understand that the fault detection module 300 only generates a fan fault prompt signal when the voltage and current detection module 200 and the current detection module 100 both send out fault signals, and the fan fault prompt signal can be sent to a single chip microcomputer or an upper computer to give an alarm or prompt. Furthermore, when the fan breaks down, the single chip microcomputer or the upper computer can also timely turn off the power supply of the fan or the equipment power supply according to the fan failure prompt signal, so that the fan is prevented from being damaged or other devices in the equipment are prevented from being damaged due to overheating caused by poor operation of the air cooling device.
Further, referring to fig. 2 and fig. 3, fig. 2 is a schematic circuit diagram of an embodiment of the fan fault detection circuit of the present invention; fig. 3 is a schematic circuit diagram of a peripheral auxiliary unit according to an embodiment of the fan fault detection circuit of the present invention;
the current detection module 100 includes a current comparison unit and a peripheral auxiliary unit; wherein,
the input end of the current comparing unit is connected to one end of the peripheral auxiliary unit, the output end of the current comparing unit is connected to one input end of the fault detecting module 300, and the input end of the peripheral auxiliary unit is connected to the power supply terminal (refer to power supply terminals FAN + and I _ FAN in fig. 3);
the peripheral auxiliary unit is used for connecting a fan;
it should be noted that, referring to fig. 3, an extension line of the peripheral auxiliary unit is connected to one end of the current comparing unit, the peripheral auxiliary unit at least includes a fan interface and a current limiting resistor, the fan interface is connected to a fan, and the current limiting resistor is used to generate a voltage drop, so that the voltage drops at two ends of the comparator in the current comparing unit are consistent.
The current comparing unit is configured to receive a current of the fan, compare the current with the preset current, and output a current fault signal to the fault detecting module 300 when the current is smaller than the preset current.
The current comparison unit comprises first to seventh resistors, first to second capacitors and a comparator U4; a first end of the first resistor R1 is connected to a reference voltage terminal VDD, a second end of the first resistor R1 is connected to a first end of a first capacitor C1, a first end of a second resistor R2, and a first end of a fourth resistor R4, and the first capacitor C1 is connected to a second end of the second resistor R2 and grounded to GND;
a second end of the fourth resistor R4 is connected to a second end of a second capacitor C2 and an inverting input end of the comparator U4, a non-inverting input end + of the comparator U4 is connected to a first end of the second capacitor C2, a second end of a third resistor R3 and a first end of a fifth resistor R5, a first end of the third resistor R3 is connected to a FAN voltage terminal I _ FAN, and an output end of the comparator U4 is connected to a second end of the fifth resistor R5, a second end of the sixth resistor R6 and a first end of a seventh resistor R7;
a first terminal of the sixth resistor R6 is connected to the system voltage terminal VSS, and a second terminal of the seventh resistor R7 is connected to an input terminal of the fault detection module 300. The voltage output by the system voltage terminal VSS may be 12V.
It should be noted that, the voltage of the reference voltage terminal VDD is provided by a reference voltage circuit, which may be a voltage source or a circuit, the first resistor R1 and the second resistor R2 are voltage dividing resistors, which divide the received voltage to form a reference voltage at the first terminal of the fourth resistor R4, and the reference voltage enters the inverting input terminal of the comparator U4 through the fourth resistor R4 to form a preset current.
The peripheral auxiliary unit comprises an electrolytic capacitor CE, an eighteenth resistor R18 and first to second fan interfaces; the first FAN interface J1 is connected in parallel with the second FAN interface J2, power supply terminals (refer to power supply terminals FAN + and I _ FAN in fig. 3) are connected to two ends of the first FAN interface J1 and the second FAN interface J2, a first end of the eighteenth resistor R18 is connected to a negative end of the electrolytic capacitor CE, a positive end of the electrolytic capacitor CE is connected to one end of the first FAN interface J1, and a second end of the eighteenth resistor R18 is connected to the other end of the first FAN interface J1.
It should be noted that the current voltage of the fan obtained by voltage division of the peripheral auxiliary unit is input to the third resistor R3 and enters the non-inverting input terminal + of the comparator U4, so as to form the current. The comparator U4 compares the present current with a preset current, and outputs a high-level electrical signal, that is, a current fault signal, to the fault detection module 300 when the present current is smaller than the preset current.
Further, with continued reference to fig. 2, the voltage detection module 200 includes a first chip U1, eighth to twelfth resistors, and a third capacitor C3; wherein,
a first end of an eighth resistor R8 is connected to a FAN voltage terminal FAN +, a second end of the eighth resistor R8 is connected to a second end of a ninth resistor R9 and a sixth pin of a first chip U1, a second end of the ninth resistor R9 is connected to a first pin of the first chip U1, a second pin of the first chip U1 is grounded GND, a first pin of the first chip U1 is further connected to a first end of an eleventh resistor R11 and a first end of a twelfth resistor R12, and a second end of the eleventh resistor R11 is connected to a second end of the twelfth resistor R12 and grounded GND;
a first end of a tenth resistor R10 is connected to the fourth pin of the first chip U1, the reference voltage terminal VDD, and the first end of the third capacitor C3, a second end of the third capacitor C3 is connected to the ground GND, a second end of the tenth resistor R10 is connected to the third pin of the first chip U1 and the fifth pin of the first chip U1, and the third pin of the first chip U1 is further connected to another input terminal of the fault detection module 300.
It should be noted that the eighth resistor R8, the ninth resistor R9, the eleventh resistor R11, and the twelfth resistor R12 form a voltage sampling circuit, current voltages are input to the first pin and the sixth pin of the first chip U1, the first chip U1 generates a preset voltage range according to the reference voltage received by the fourth pin, and determines whether the current voltages exceed the preset voltage range, and when the current voltages exceed the preset voltage range, a high level signal (i.e., a voltage fault signal) is output to the fault detection module 300 through the third pin.
Further, with continued reference to fig. 2, the fault detection module 300 includes a voltage stabilization unit 302 and a fault detection unit 301; the input end of the voltage stabilizing unit 302 is connected to the power supply voltage terminal FAN +, the output end of the voltage stabilizing unit 302 is connected to one end of the fault detection unit 301, one input end of the fault detection unit 301 is connected to the output end of the voltage detection module 200, and one input end of the fault detection unit 301 is connected to the output end of the current detection module 100.
The failure detection unit 301 includes: comprises a photoelectric coupler U2, a first triode Q1 and thirteenth to fifteenth resistors; the photoelectric coupler U2 comprises a photodiode D and a phototriode Q2;
an anode of the photodiode D is connected to a second end of the seventh resistor R7, a cathode of the photodiode D is connected to a collector of the first transistor Q1, an emitter of the first transistor Q1 is connected to a second end of the thirteenth resistor R13 and is grounded to GND, a base of the first transistor Q1 is connected to a first end of the thirteenth resistor R13 and a first end of the fourteenth resistor R14, and a second end of the fourteenth resistor R14 is connected to the third pin of the first chip U1;
further, the collector of the first transistor Q1 is further connected to a voltage regulation unit 302, and the voltage regulation unit 302 is configured to provide a voltage to the first transistor Q1.
It is easy to understand that the second terminal of the fourteenth resistor R14 is connected to the third pin of the first chip U1, and when receiving a high level signal, the high level signal is output to the base of the first transistor Q1, and the voltage division function of the third resistor R3 causes the base-emitter tube voltage drop of the first transistor Q1 to satisfy the conduction condition of the first transistor Q1, and the collector and the emitter of the first transistor Q1 form a ground loop, so that the collector voltage is reduced to a low level.
The base electrode of the photo-transistor Q2 is used for receiving light emitted by the photodiode D, the emitter electrode of the photo-transistor Q2 is grounded GND, the collector electrode of the photo-transistor Q2 is connected with the first end of the fifteenth resistor R15, and the second end of the fifteenth resistor R15 is connected with the reference voltage end VDD.
It should be understood that if the current detection module 100 detects a current abnormality at the same time, a high-level signal is output to the photodiode D of the photocoupler U2, and the cathode of the photodiode D is connected to the collector of the first transistor Q1, and when the collector is at a low level, the photodiode D is turned on. On the contrary, if the collector maintains a high level, the photodiode D is not turned on, that is, the photodiode D is not turned on when only the voltage fault signal is received, only the current fault signal is received, or the voltage fault signal and the current fault signal are not received, and the photodiode D is turned on only when the conditions that the voltage and the current are both faults are satisfied.
It is easy to understand that, as the photodiode D is turned on and emits light, the base of the phototransistor Q2 receives a high level, the emitter of the phototransistor Q2 is grounded GND, the collector of the phototransistor Q2 is connected to the reference voltage terminal VDD through the fifteenth resistor R15, the voltage output from the reference voltage terminal VDD may be 3.3V, and when the phototransistor Q2 is turned on, the collector of the phototransistor Q2 is lowered to a low level, so that the signal received by the error terminal is lowered from the normal high level to a low level, that is, a fan fault signal is output. The error end can be connected to an upper computer or a micro control unit to perform alarm control on abnormal fans.
It should be understood that the photo transistor Q2 and the first transistor Q1 are NPN transistors.
Further, with continued reference to fig. 2, the input terminal of the voltage stabilizing unit 302 is connected to one end of the fan, and the output terminal of the voltage stabilizing unit 302 is connected to one end of the fault detecting module 300; the voltage stabilizing unit 302 comprises a fourth capacitor C4, a sixteenth resistor R16, a seventeenth resistor R17, a voltage stabilizing diode Z and a voltage stabilizer U3; wherein,
a first end of the sixteenth resistor R16 is connected to a FAN voltage terminal FAN +, a second end of the sixteenth resistor R16 is connected to a gate of the voltage regulator U3 and a second end of the fourth capacitor C4, and a first end of the fourth capacitor C4 is connected to an anode of the zener diode Z and a cathode of the voltage regulator U3;
a first terminal of the seventeenth resistor R17 is connected to the gate of the regulator U3, and a second terminal of the seventeenth resistor R17 is connected to the anode of the regulator U3 and grounded to GND.
It is easy to understand that the fourth capacitor C4, the sixteenth resistor R16, the seventeenth resistor R17 and the regulator U3 in the voltage regulation unit 302 form a regulated voltage and output the regulated voltage to the collector of the first transistor Q1 through the zener diode Z.
This embodiment is through carrying out real-time detection to current voltage and current electric current to produce fan trouble cue signal when the two is all in abnormal state, prevented that fan fault detection misstatement, simultaneously, the utility model discloses the good interference killing feature of circuit stability is stronger.
Furthermore, the utility model discloses still provide a fan fault detection device, the device includes: the fan failure detection circuit as described above.
Since the fan fault detection device adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in the specific application, those skilled in the art can set the solution as required, and the present invention is not limited thereto.
It should be noted that the above-described work flow is only illustrative, and does not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to practical needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment can be referred to the fan fault detection circuit provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (9)
1. A fan fault detection circuit, the circuit comprising: the device comprises a voltage detection module, a current detection module and a fault detection module; the detection end of the voltage detection module is connected with one end of the fan, the detection end of the current detection module is connected with the other end of the fan, the output end of the current detection module is connected with one input end of the fault detection module, and the other input end of the fault detection module is connected with the output end of the voltage detection module;
the current detection module is used for detecting the current of the fan and outputting a current fault signal to the fault detection module when the current is smaller than a preset current;
the voltage detection module is used for detecting the current voltage of the fan and outputting a voltage fault signal to the fault detection module when the current voltage exceeds a preset voltage range;
the fault detection module is used for generating a fan fault prompt signal and outputting the fan fault prompt signal when receiving the current fault signal and the voltage fault signal.
2. The fan fault detection circuit of claim 1, wherein the current detection module comprises a current comparison unit and a peripheral auxiliary unit; wherein,
the input end of the current comparison unit is connected with one end of the peripheral auxiliary unit, the output end of the current comparison unit is connected with one input end of the fault detection module, and the input end of the peripheral auxiliary unit is connected with the power supply end;
the peripheral auxiliary unit is used for connecting a fan;
the current comparison unit is used for receiving the current of the fan, comparing the current with the preset current, and outputting a current fault signal to the fault detection module when the current is smaller than the preset current.
3. The fan malfunction detection circuit according to claim 2, wherein the current comparison unit includes first to seventh resistors, first to second capacitors, and a comparator; wherein,
the first end of the first resistor is connected with the reference voltage end, the second end of the first resistor is connected with the first end of the first capacitor, the first end of the second resistor and the first end of the fourth resistor, and the first capacitor is connected with the second end of the second resistor and grounded;
the second end of the fourth resistor is connected with the second end of the second capacitor and the inverting input end of the comparator, the non-inverting input end of the comparator is connected with the first end of the second capacitor, the second end of the third resistor and the first end of the fifth resistor, the first end of the third resistor is connected with the fan voltage end, and the output end of the comparator is connected with the second end of the fifth resistor, the second end of the sixth resistor and the first end of the seventh resistor;
and the first end of the sixth resistor is connected with the system voltage end, and the second end of the seventh resistor is connected with one input end of the fault detection module.
4. The fan malfunction detection circuit according to claim 3, wherein the peripheral auxiliary unit includes an electrolytic capacitor, an eighteenth resistor, and first to second fan interfaces; wherein,
the first fan interface is connected with the second fan interface in parallel, the power supply ends are connected to the two ends of the first fan interface and the two ends of the second fan interface, the first end of the eighteenth resistor is connected with the negative end of the electrolytic capacitor, the positive end of the electrolytic capacitor is connected with one end of the first fan interface, and the second end of the eighteenth resistor is connected with the other end of the first fan interface.
5. The fan fault detection circuit of claim 4, wherein the voltage detection module comprises a first chip, eighth to twelfth resistors, and a third capacitor; wherein,
a first end of an eighth resistor is connected with a fan voltage end, a second end of the eighth resistor is connected with a second end of a ninth resistor and a sixth pin of a first chip, a second end of the ninth resistor is connected with a first pin of the first chip, a second pin of the first chip is grounded, a first pin of the first chip is further connected with a first end of an eleventh resistor and a first end of a twelfth resistor, and a second end of the eleventh resistor is connected with a second end of the twelfth resistor and grounded;
a first end of a tenth resistor is connected with a fourth pin of the first chip, the reference voltage end and a first end of the third capacitor, a second end of the third capacitor is grounded, a second end of the tenth resistor is connected with the third pin of the first chip and the fifth pin of the first chip, and the third pin of the first chip is further connected with the other input end of the fault detection module.
6. The fan fault detection circuit according to claim 5, wherein the fault detection module includes a voltage stabilization unit and a fault detection unit; the input end of the voltage stabilizing unit is connected with the power supply voltage end, the output end of the voltage stabilizing unit is connected with one end of the fault detection unit, one input end of the fault detection unit is connected with the output end of the voltage detection module, and one input end of the fault detection unit is connected with the output end of the current detection module.
7. The fan fault detection circuit as claimed in claim 6, wherein said fault detection unit comprises: a photoelectric coupler, a first triode and thirteenth to fifteenth resistors; the photoelectric coupler comprises a photoelectric diode and a photosensitive triode;
the anode of the photodiode is connected with the second end of the seventh resistor, the cathode of the photodiode is connected with the collector of the first triode, the emitter of the first triode is connected with the second end of the thirteenth resistor and grounded, the base of the first triode is connected with the first end of the thirteenth resistor and the first end of the fourteenth resistor, and the second end of the fourteenth resistor is connected with the third pin of the first chip;
the base electrode of the phototriode is used for receiving light emitted by the photodiode, the emitting electrode of the phototriode is grounded, the collector electrode of the phototriode is connected with the first end of a fifteenth resistor, and the second end of the fifteenth resistor is connected with the reference voltage end.
8. The fan fault detection circuit according to claim 7, wherein an input terminal of the voltage stabilization unit is connected to one terminal of the fan, and an output terminal of the voltage stabilization unit is connected to one terminal of the fault detection module; the voltage stabilizing unit comprises a fourth capacitor, a sixteenth resistor, a seventeenth resistor, a voltage stabilizing diode and a voltage stabilizer; wherein,
a first end of the sixteenth resistor is connected with a fan voltage end, a second end of the sixteenth resistor is connected with a gate level of the voltage stabilizer and a second end of the fourth capacitor, and a first end of the fourth capacitor is connected with an anode of the voltage stabilizing diode and a cathode of the voltage stabilizer;
and the first end of the seventeenth resistor is connected with the gate level of the voltage stabilizer, and the second end of the seventeenth resistor is connected with the anode of the voltage stabilizer and grounded.
9. A fan failure detection apparatus, the apparatus comprising: the fan malfunction detection circuit of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120660862.2U CN214577875U (en) | 2021-03-31 | 2021-03-31 | Fan fault detection circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120660862.2U CN214577875U (en) | 2021-03-31 | 2021-03-31 | Fan fault detection circuit and device |
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| CN214577875U true CN214577875U (en) | 2021-11-02 |
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| CN202120660862.2U Withdrawn - After Issue CN214577875U (en) | 2021-03-31 | 2021-03-31 | Fan fault detection circuit and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112922894A (en) * | 2021-03-31 | 2021-06-08 | 武汉联一合立技术有限公司 | Fan fault detection circuit, device and control method |
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2021
- 2021-03-31 CN CN202120660862.2U patent/CN214577875U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112922894A (en) * | 2021-03-31 | 2021-06-08 | 武汉联一合立技术有限公司 | Fan fault detection circuit, device and control method |
| CN112922894B (en) * | 2021-03-31 | 2024-07-16 | 武汉联一合立技术有限公司 | Fan fault detection circuit, device and control method |
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