CN208417028U - A kind of DC fan stall detection circuit - Google Patents
A kind of DC fan stall detection circuit Download PDFInfo
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- CN208417028U CN208417028U CN201820932890.3U CN201820932890U CN208417028U CN 208417028 U CN208417028 U CN 208417028U CN 201820932890 U CN201820932890 U CN 201820932890U CN 208417028 U CN208417028 U CN 208417028U
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Abstract
The utility model discloses a kind of DC fan stall detection circuits, current-limiting circuit including being connected to the detection circuit signal output end of rotating speed of DC fan, current-limiting circuit includes the current-limiting resistance R3 and current-limiting resistance R4 that one end is connected to detection circuit signal output end, one end of the other end connection filter capacitor c1 of current-limiting resistance R4, breakdown circuit is provided between the other end of current-limiting resistance R3 and the other end of filter capacitor c1, switch is connected to the cathode of zener diode D1 with the base stage of triode Q2, switch connects power supply with the emitter of triode Q2, switch passes through the base stage of current-limiting resistance R7 connection switch triode Q3 and the anode of zener diode D2 with the collector of triode Q2, switch is grounded with the emitter of triode Q3, the collector of switch triode Q3 passes through Pull-up resistor R8 connection power supply.The utility model can drag down fan failure signal, detect fan failure.
Description
Technical field
The utility model belongs to fault detection circuit, and in particular to a kind of DC fan stall detection circuit.
Background technique
Currently, fan manufacturer is to enhance product performance and efficiency, it is possible to provide give client the various fans with different function.Such as
Frequency or tach signal output FG function, operating detection signal output RD function, the reversed-phase output signal RDb function of RD etc., can
It detects fan and turns degree or operating status.These signals can export the signal of varying level when fan stalls.
Traditional design, the level using the fan output signal with fan rotation detecting function (or its derivation function) are
High (or being low) is to determine whether be fan failure.The invention is proposed a kind of novel using rotation speed of the fan output signal (FG)
Detect the circuit of fan stall, the flexibility of type selecting when improving product design.
Summary of the invention:
In order to overcome the defect of above-mentioned background technique, the utility model provides a kind of DC fan stall detection electricity
Fan failure signal can be dragged down, and the signal after dragging down is exported to processor by road.
In order to solve the above-mentioned technical problem the used technical solution of the utility model are as follows:
A kind of DC fan stall detection circuit, the detection circuit signal including being connected to rotating speed of DC fan export
The current-limiting circuit at end, current-limiting circuit include the current-limiting resistance R3 and current-limiting resistance that one end is connected to detection circuit signal output end
One end of the other end connection filter capacitor c1 of R4, current-limiting resistance R4, the other end of current-limiting resistance R3 and filter capacitor c1's is another
Breakdown circuit is provided between one end, breakdown circuit includes the biasing being sequentially connected in series between current-limiting resistance R3 and filter capacitor c1
Resistance R5, zener diode D1, zener diode D2 and biasing resistor R6, switch are connected to pressure stabilizing two with the base stage of triode Q2
The cathode of pole pipe D1, switch connect power supply with the emitter of triode Q2, and the collector of switch triode Q2 passes through limit
Leakage resistance R7 the connection switch base stage of triode Q3 and the anode of zener diode D2, switch are connect with the emitter of triode Q3
Ground, switch pass through pull-up resistor R8 connection power supply, and the output as fault detection circuit with the collector of triode Q3
Hold the input terminal for connecting processor.
Preferably, the cathode of zener diode D1 connects biasing resistor R5, the anode of zener diode D1 in breakdown circuit
The cathode of zener diode D2 is connected, zener diode D2 anode connects biasing resistor R6.
Preferably, biasing resistor R6 is additionally provided with anti-interference capacitor C3 in parallel.
Preferably, biasing resistor R5 is additionally provided with anti-interference capacitor C2 in parallel.
Preferably, switch is PNP triode with triode Q2.
Preferably, switch is NPN triode with triode Q3.
Preferably, zener diode D1 and zener diode D2 is 15V voltage-stabiliser tube.
The utility model has the beneficial effects that: the detection circuit FAN output signal FG of rotating speed of DC fan is via resistance
50% square-wave pulse signal is transformed into the direct current signal of approximate 12V by the low-pass filter circuit of R4, capacitor C1 composition, at this time
15V voltage-stabiliser tube D1, D2 are not up to breakdown condition, and triode Q2 and Q3 fail to be connected, fan failure signal FAN_Fault quilt
Pull-up resistor R8 is drawn high always, and processor persistently receives this and draws high signal.When stalled fan Q1 output level is low, pressure stabilizing
Diode D1 conducting, PNP triode Q2 conducting, so that NPN triode Q3 is connected, fan failure signal FAN_Fault is lower, and locates
Reason device receives signal intensity, which can show DC fan failure.When stalled fan Q1 output level is height
When, 24V is connected by R3, R4, R6, D2 access, and the Vbe both end voltage of Q3 is greater than 0.7V, Q3 conducting, by fan failure signal
FAN_Fault is dragged down, fan failure.Via after this processing of circuit, fan failure signal can be dragged down, detect fan event
Barrier.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model embodiment；
Fig. 2 is the signal output waveform figure of the detection circuit of the utility model embodiment.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and examples.
A kind of DC fan stall detection circuit, as shown in Figure 1, including the detection electricity for being connected to rotating speed of DC fan
The current-limiting circuit of road FAN signal output end, current-limiting circuit include the current-limiting resistance that one end is connected to detection circuit signal output end
One end of the other end connection filter capacitor c1 of R3 and current-limiting resistance R4, current-limiting resistance R4, the other end of current-limiting resistance R3 and filter
Breakdown circuit is provided between the other end of wave capacitor c1, breakdown circuit includes being sequentially connected in series in current-limiting resistance R3 and filter capacitor
Biasing resistor R5, zener diode D1, zener diode D2 and biasing resistor R6 between c1, the switch base stage of triode Q2
It is connected to the cathode of zener diode D1, the switch emitter of triode Q2 connects power supply, and switch is with triode Q2's
Collector uses triode by current-limiting resistance R7 the connection switch base stage of triode Q3 and the anode of zener diode D2, switch
The emitter of Q3 is grounded, and switch is examined with the collector of triode Q3 by pull-up resistor R8 connection power supply, and as failure
The output end FAN_Fault of slowdown monitoring circuit is used to connect the input terminal of processor.
Puncture in circuit, the cathode of zener diode D1 connects biasing resistor R5, and the anode connection of zener diode D1 is steady
The cathode of diode D2 is pressed, zener diode D2 anode connects biasing resistor R6.
In the present embodiment, biasing resistor R6 is additionally provided with anti-interference capacitor C3 in parallel.Biasing resistor R5 is additionally provided in parallel
Anti-interference capacitor C2.Switch is PNP triode with triode Q2.Switch is NPN triode with triode Q3.Zener diode D1
It is 15V voltage-stabiliser tube with zener diode D2.
The detection circuit of rotating speed of DC fan is as shown in Figure 1, include resistance R1, triode Q1 and resistance R2.
The present embodiment utilizes fan FG function, such as attached drawing 1.When fan runs well, the detection electricity of rotating speed of DC fan
50% square-wave pulse signal is transformed into approximation via the low-pass filter circuit that resistance R4, capacitor C1 are formed by road output signal FG
The direct current signal of 12V, 15V voltage-stabiliser tube D1, D2 are not up to breakdown condition at this time, and triode Q2 and Q3 fail to be connected, fan event
Barrier signal FAN_Fault is pulled up resistance R8 and draws high always, and processor persistently receives this and draws high signal.When stalled fan Q1 is exported
When level is low, zener diode D1 conducting, PNP triode Q2 conducting, so that NPN triode Q3 is connected, fan failure signal
FAN_Fault is lower, and processor receives signal intensity, which shows DC fan failure.When stalled fan Q1 is defeated
When level is high out, 24V is connected by R3, R4, R6, D2 access, and the Vbe both end voltage of Q3 is greater than 0.7V, Q3 conducting, by wind
Fan failure signal FAN_Fault is dragged down, fan failure.Realize that the waveform such as Fig. 2 exports.
The invention proposes fan stall detection circuits.The fan exported with frequency or tach signal runs well
When, that FG is exported is a series of square-wave signal of continuous 50% duty cycles, this circuit output fan failure signal FAN_Fault
For high level；When fan is locked, low level or output high level signal are either exported, fan output signal is via low pass
After filter circuit R4, C1 filtering, pressure stabilizing is punctured to control the switch of triode by zener diode, believes this circuit output
Number FAN_Fault is dragged down, and is judged as fan failure by control of product part.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (7)
1. a kind of DC fan stall detection circuit, it is characterised in that: the detection electricity including being connected to rotating speed of DC fan
The current-limiting circuit of road signal output end, the current-limiting circuit include the current limliting that one end is connected to the detection circuit signal output end
The other end of resistance R3 and current-limiting resistance R4, the current-limiting resistance R4 connect one end of filter capacitor c1, the current-limiting resistance R3
The other end and the filter capacitor c1 the other end between be provided with breakdown circuit, the breakdown circuit includes being sequentially connected in series
Biasing resistor R5, zener diode D1, zener diode D2 between the current-limiting resistance R3 and the filter capacitor c1 and partially
Resistance R6 is set, switch is connected to the cathode of zener diode D1, the switch emitter of triode Q2 with the base stage of triode Q2
Connect power supply, switch passes through the base stage of current-limiting resistance R7 connection switch triode Q3 and steady with the collector of triode Q2
The anode of diode D2 is pressed, switch is grounded with the emitter of triode Q3, and switch passes through pull-up electricity with the collector of triode Q3
R8 connection power supply is hindered, and is used to connect the input terminal of processor as the output end of the fault detection circuit.
2. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: the breakdown circuit
In, the cathode of the zener diode D1 connects the biasing resistor R5, and the anode connection of the zener diode D1 is described steady
The cathode of diode D2 is pressed, the zener diode D2 anode connects biasing resistor R6.
3. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: the biasing resistor
R6 is additionally provided with anti-interference capacitor C3 in parallel.
4. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: the biasing resistor
R5 is additionally provided with anti-interference capacitor C2 in parallel.
5. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: described to switch with three
Pole pipe Q2 is PNP triode.
6. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: described to switch with three
Pole pipe Q3 is NPN triode.
7. a kind of DC fan stall detection circuit according to claim 1, it is characterised in that: two pole of pressure stabilizing
The pipe D1 and zener diode D2 is 15V voltage-stabiliser tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820932890.3U CN208417028U (en) | 2018-06-15 | 2018-06-15 | A kind of DC fan stall detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820932890.3U CN208417028U (en) | 2018-06-15 | 2018-06-15 | A kind of DC fan stall detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208417028U true CN208417028U (en) | 2019-01-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820932890.3U Active CN208417028U (en) | 2018-06-15 | 2018-06-15 | A kind of DC fan stall detection circuit |
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| Country | Link |
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| CN (1) | CN208417028U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899310A (en) * | 2019-02-28 | 2019-06-18 | 苏州浪潮智能科技有限公司 | A kind of rotation speed of the fan detection method, system, equipment and computer storage medium |
-
2018
- 2018-06-15 CN CN201820932890.3U patent/CN208417028U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899310A (en) * | 2019-02-28 | 2019-06-18 | 苏州浪潮智能科技有限公司 | A kind of rotation speed of the fan detection method, system, equipment and computer storage medium |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 430040 workshop D, no.6, ligongyuan Road, Science Park, Wuhan University of technology, Donghu Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Gangdi Technology Co.,Ltd. Address before: 430223 No. 6, Ligong Road, science and Technology Park, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN GUIDE ELECTRIC DRIVE TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |