CN201503482U - Working state feedback circuit of direct current brushless motor - Google Patents
Working state feedback circuit of direct current brushless motor Download PDFInfo
- Publication number
- CN201503482U CN201503482U CN2009201936386U CN200920193638U CN201503482U CN 201503482 U CN201503482 U CN 201503482U CN 2009201936386 U CN2009201936386 U CN 2009201936386U CN 200920193638 U CN200920193638 U CN 200920193638U CN 201503482 U CN201503482 U CN 201503482U
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- circuit
- brushless motor
- feedback circuit
- feedback
- motor duty
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Abstract
The utility model discloses a working state feedback circuit of a direct current (DC) brushless motor used for characterizing readability of feedback signals of a failure detection circuit of a motor. The working state feedback circuit of the DC brushless motor comprises a triode and a characterization circuit. A resistor is connected in series between an emitter and a base electrode of the triode; a DC voltage is applied between the base electrode and the emitter; the emitter is grounded; a collector is connected with a feedback signal output line of the motor; and the collector is externally provided with the characterization circuit for visually showing different impulse modes in the feedback signals. The working state feedback circuit of the DC brushless motor can conduct visual characterization by using a measurement tool or other optical devices through leading the feedback signals out of a control circuit board, thereby leading the determination of failure causes inside a blower to be simple and visual and reducing the difficulties and cost of maintenance and repair.
Description
Technical field
The utility model relates to a kind of dc brushless motor duty feedback circuit.
Background technology
How the duty with motor in the blower fan characterizes outside motor even blower fan, so that the maintainer determines the duty of motor quickly and easily, has bigger importance for maintenance work.
In the motor, generally be integrated with failure detector circuit, when detecting fault, it utilizes different impulse forms by feeder line output fault type signal.Fail to utilize this function in the existing blower fan, when blower fan detected fault, the corresponding output pin of blower fan inside chip switched to low level signal output from high level, the velocity feedback triode ends thus, outer pull-up resistor work, level state are high level, characterize the generation of fault with this.Though this measure can reflect whether there is fault in the control circuit, but producers, maintainer and user can't judge the concrete reason of this fault, be difficult to maintenance and continue use, if the inducement of fault is due to the external factor, as input voltage less than or greater than the operating voltage of control panel, or some outside factors of speed-regulating signal loose contact or the like, blower fan causes to return factory and searches the means of production owing to can't correctly characterize, perhaps take blower fan apart and search reason, so that the maintenance control circuit board, time-consuming consumption power.
The utility model content
The purpose of this utility model is such deficiency at prior art, provides a kind of and can intuitively characterize the fan trouble reason so that the dc brushless motor duty feedback circuit of safeguarding.
For realizing this purpose, the utility model is taked following technical scheme:
Dc brushless motor duty feedback circuit of the present utility model, being used for that the feedback signal of electrical fault testing circuit is carried out readability characterizes, comprise triode and characterize circuit, series resistor between the emitter of triode and base stage, apply DC voltage between base stage and emitter, grounded emitter, collector is connected with the feedback signal output line of motor, and external one characterizes the different impulse forms that circuit is used for the described feedback signal of visable representation on collector.
Described sign circuit comprises that one is used for the oscillograph that the waveform with feedback signal shows, or comprises that a pulse change with feedback signal produces the light-emitting component that brightness changes, and described light-emitting component is a light emitting diode.
In addition, described sign circuit is connected in series mutually with a divider resistance.In like manner, described collector and base stage all can be connected in series divider resistance.
Compared with prior art, the utlity model has following advantage: the utility model is by drawing feedback signal outside the control circuit board, carry out visual sign with survey instrument or other optical devices, make blower fan internal fault reason determine become simple and directly perceived, can reduce the difficulty and the cost of maintenance, maintenance.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model;
Fig. 2 is the circuit theory diagrams of another embodiment of the utility model.
Embodiment
Followingly describe in conjunction with the accompanying drawings and embodiments:
See also following table, this table shows, in the known dc brushless motor, in case there is fault to take place, just can export corresponding feedback signal by the output line of its failure detector circuit:
| Number of state indexes | State description | Output umber of pulse/cycle |
| 1 | Non-fault, the motor normal rotation | Dutycycle is 50% continuous arteries and veins |
| 2 | The speed-regulating signal fault | 1 pulse/cycle |
| 3 | Under-voltage | 2 pulse/cycles |
| 4 | Overvoltage | 3 pulse/cycles |
| 5 | The current feedback fault | 4 pulse/cycles |
| 6 | Low speed/stall | 5 pulse/cycles |
| 7 | Motor overheating | 6 pulse/cycles |
The variation of pulse shows as different waveforms on oscillograph M, then show as the variation on time, the amplitude (level height) in physics, and the utility model has utilized this specific character to propose just.
See also first embodiment of the present utility model that Fig. 1 discloses, dc brushless motor duty feedback circuit comprises a triode Q, its base stage meets one 10 kilohms divider resistance R2, connect one 47 kilohms resistance R 3 between the emitter of ground connection and the base stage, collector is connected in series mutually with the feedback signal fg output line of electrical fault testing circuit after then passing through the resistance R 1 of one 680 ohm of serial connections.
Between the resistance R 1 of feedback signal fg output line and collector, feedback circuit of the present utility model also is provided with one and characterizes circuit, this sign circuit comprises that an oscillograph M is connected in series mutually with one 20 kilohms divider resistance R4, drive and apply voltage VCC between oscillograph M and this divider resistance R4, find out thus, the sign circuit needn't depend on the annexation between inner each utmost point of triode Q by additionally applying voltage (by power drives), and can be extended out outside the triode Q, thereby can be led to the optional position of blower fan.The amplification of triode Q and switching characteristic make the feedback signal of motor be exported to oscillograph M and show.Thereby, make the user only just can be clear that the pulse waveform of feedback signal fg by oscillograph M, the failure cause that table can be determined motor is gone up in contrast then, not only intuitively but also convenient.
See also second embodiment of the present utility model that Fig. 2 discloses, the formation that only is to characterize circuit outside this embodiment is different with first embodiment is different, last embodiment adopts oscillograph M that feedback signal fg is carried out visual sign, and present embodiment adopt light-emitting component especially LED characterize.The pulse of feedback signal fg is owing to exist the variation of high electronegative potential, characterize the variation that forms potential difference (PD) between circuit VCC end and collector terminal thereby make, thereby make LED follow the pulse change of feedback signal fg and change, the maintainer can search the failure cause of motor internal thus equally.
The resistance of the various resistance of each part mentioned above, all visual actual conditions are adjusted, and those skilled in the art all should know this alternatives.
In addition, in the described sign circuit, except using oscillograph and light-emitting component, also can adopt as the sounding component of loudspeaker and so on and realize that its principle and the foregoing description are same, thereby not all right giving unnecessary details.
In sum, dc brushless motor duty feedback circuit of the present utility model is convenient to the maintainer in its internal fault reason of the outside investigation of blower fan, for maintenance work is provided convenience.
Claims (9)
1. dc brushless motor duty feedback circuit, being used for that the feedback signal of electrical fault testing circuit is carried out readability characterizes, it is characterized in that: comprise triode and characterize circuit, series resistor between the emitter of triode and base stage, apply DC voltage between base stage and emitter, grounded emitter, collector is connected with the feedback signal output line of motor, and external one characterizes the different impulse forms that circuit is used for the described feedback signal of visable representation on collector.
2. dc brushless motor duty feedback circuit according to claim 1 is characterized in that: described sign circuit comprises that one is used for the oscillograph that the waveform with feedback signal shows.
3. dc brushless motor duty feedback circuit according to claim 1 is characterized in that: described sign circuit comprises that a pulse change with feedback signal produces the light-emitting component that brightness changes.
4. dc brushless motor duty feedback circuit according to claim 3 is characterized in that: described light-emitting component is a light emitting diode.
5. dc brushless motor duty feedback circuit according to claim 1 is characterized in that: described sign circuit comprises that one produces the sounding component of sound variation with the pulse change of feedback signal.
6. dc brushless motor duty feedback circuit according to claim 5 is characterized in that: described sounding component is a loudspeaker.
7. according to any described dc brushless motor duty feedback circuit in the claim 1 to 6, it is characterized in that: described sign circuit is connected in series mutually with a divider resistance.
8. according to any described dc brushless motor duty feedback circuit in the claim 1 to 4, it is characterized in that: serial connection one divider resistance in the described collector.
9. according to any described dc brushless motor duty feedback circuit in the claim 1 to 4, it is characterized in that: serial connection one divider resistance in the described base stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201936386U CN201503482U (en) | 2009-08-28 | 2009-08-28 | Working state feedback circuit of direct current brushless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201936386U CN201503482U (en) | 2009-08-28 | 2009-08-28 | Working state feedback circuit of direct current brushless motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201503482U true CN201503482U (en) | 2010-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201936386U Expired - Lifetime CN201503482U (en) | 2009-08-28 | 2009-08-28 | Working state feedback circuit of direct current brushless motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201503482U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033202A (en) * | 2010-11-11 | 2011-04-27 | 苏州合欣美电子科技有限公司 | Motor detection circuit for ecological house |
| CN110470988A (en) * | 2019-09-18 | 2019-11-19 | 东莞市润达散热风扇有限公司 | A kind of brushless motor multifunctional testing circuit |
-
2009
- 2009-08-28 CN CN2009201936386U patent/CN201503482U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033202A (en) * | 2010-11-11 | 2011-04-27 | 苏州合欣美电子科技有限公司 | Motor detection circuit for ecological house |
| CN110470988A (en) * | 2019-09-18 | 2019-11-19 | 东莞市润达散热风扇有限公司 | A kind of brushless motor multifunctional testing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100609 |