CN203133225U - Driving and state detecting circuit for DC fan - Google Patents
Driving and state detecting circuit for DC fan Download PDFInfo
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- CN203133225U CN203133225U CN 201320170761 CN201320170761U CN203133225U CN 203133225 U CN203133225 U CN 203133225U CN 201320170761 CN201320170761 CN 201320170761 CN 201320170761 U CN201320170761 U CN 201320170761U CN 203133225 U CN203133225 U CN 203133225U
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- fan
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Abstract
The utility model relates to a driving and state detecting circuit for a DC fan, which is connected with the fan and processes an output pulse width modulation type signal based on a digital signal. The pulse width modulation type signal is transmitted to a grid of a NPN type field effect transistor Q1 after insulation by an optical coupler U1. A drain electrode is connected with a power supply VCC which is connected with a terminal P1 of the fan. A source electrode is respectively connected with base electrodes of a diode D1, a diode D2 and a NPN type triode Q2 which are connected in series. A resistor R5 is connected between the base electrode and the emitter electrode of the triode Q2. The emitter electrodes of the diode D2, the resistor R5 and the triode Q2 are grounded. A C4 end of the optical coupler U1 is connected with the collector electrode of the triode Q2 and the power supply VCC. The collector electrode of the triode Q2 outputs an alarm signal. The driving and state detecting circuit for the DC fan has the following advantages: simple design, low cost, driving insulation, capability of detecting switching-off state and unconnected state of the fan, and capability of performing detection and protection for short circuit of the fan.
Description
Technical field
The utility model relates to a kind of driving and state detection circuit of DC fan.
Background technology
DC fan is in side circuit, often need drive work with pulsewidth width modulated formula (PWM) signal, simultaneously because the consideration of safety standard aspect, need isolate with primary power, i.e. isolation drive is added some DC fan and is not had rotating speed and need signal, therefore fan-status detects relatively difficulty, need the more circuit of peripheral expansion, simultaneously, lack the detection to the fan short-circuit condition.
The utility model content
The utility model purpose is to provide a kind of simple in structure, isolation drive and can judges driving and the state detection circuit of the DC fan of fan-status.
The utility model purpose is achieved in that a kind of driving and state detection circuit of DC fan, is connected with fan, and based on the pulsewidth width modulated formula signal of digital signal processing output, wherein,
Pulse width modulated signal is connected after the optocoupler U1 isolated NPN-type gate electrode of FET Q1; drain connected to the fan through the fuse F1 and the terminal P1 of the power supply VCC connection; source electrode are respectively connected in series with a diode D1 and diode D2 and an NPN type transistor Q2's base; resistor R5 connected to the base of transistor Q2 and the emitter; diode D2, resistor R5 and the emitter of transistor Q2 to ground; optocoupler U1, C4 end and the collector of transistor Q2 connect the power supply VCC; by the collector of transistor Q2 output alarm signal; wherein
When pwm signal when low, photo-coupler U1 isolates rear drive NPN type field effect transistor Q1, make power supply VCC through the terminals P 1 of wind-receiving fan, fuse F1, NPN type field effect transistor Q1, and diode in series D1 and diode D2 form the loop, this moment, resistance R 5 was by short circuit, because the clamped effect of diode D1 and diode D2, the base voltage of triode Q2 is clamped to 1.4V triode Q2 conducting, output low level; At this moment, if fan opens circuit, then triode Q2 base voltage is clamped to zero level by R5, not conducting of triode Q2, output high level signal;
When pwm signal when being high, then photo-coupler U1 is obstructed, and Q1 is also obstructed for NPN type field effect transistor, and this moment, no matter fan normally still opened circuit, and triode Q2 base voltage is all dragged down by R5, the output high level signal.
Superiority of the present utility model is: simplicity of design, and cost is low, and isolation drive can detect the fan off state, comprises not-connected status; The detection of fan short circuit and protection.
Description of drawings
Fig. 1 the utility model circuit theory diagrams.
Embodiment
A kind of driving of DC fan and state detection circuit are connected with fan, are based on the pulsewidth width modulated formula signal (PWM) of digital signal processing (Digital Signal Processing is called for short DSP) output;
Described pulsewidth width modulated formula signal connects the grid of NPN type field effect transistor Q1 after photo-coupler U1 isolates, drain electrode is connected with the power supply VCC of the terminals P 1 of wind-receiving fan through fuse F1, source electrode connects the base stage of diode in series D1 and diode D2 and NPN type triode Q2 respectively, resistance R 5 is connected on base stage and the emitter of triode Q2, the grounded emitter of diode D2, resistance R 5 and triode Q2, the C4 end of photo-coupler U1 is connected with power supply VCC with the collector of triode Q2, by the collector output alarm signal of triode Q2.
Principle is:
Based on the pwm signal of digital signal processing output when low, photo-coupler U1 isolates rear drive field effect transistor Q1, make power supply VCC form the loop through terminals P 1, fuse F1, Q1, D1, the D2 of wind-receiving fan, this moment, R5 was by short circuit, because the clamped effect of diode D1 and diode D2, the base voltage of triode Q2 is clamped to 1.4V triode Q2 conducting, output low level; At this moment, if fan opens circuit, then triode Q2 base voltage is clamped to zero level by R5, not conducting of triode Q2, output high level signal;
If digital signal processing (DSP) output PWM is high, then photo-coupler U1 is obstructed, and triode Q1 is also obstructed, and this moment, no matter fan normally still opened circuit, and triode Q2 base voltage is all dragged down by R5, the output high level signal.
The utility model can be judged fan and whether be in off state in drive fan simultaneously in conjunction with pwm signal.
If the fan short circuit, after drive fan, field effect transistor Q1 conducting, F1 fusing, at this moment, the mechanism that opens circuit with fan is similar substantially, and triode Q2 exports high level signal.Therefore, off state also can be detected.
Owing to isolate mutually between the photo-coupler input and output, the electric signal transmission has one-way, thereby has good electrical isolation capabilities and antijamming capability.
Claims (1)
1. the driving of a DC fan and state detection circuit are connected with fan, and the pulsewidth width modulated formula signal based on digital signal processing output is characterized in that,
Pulse width modulated signal is connected after the optocoupler U1 isolated NPN-type field effect transistor Q1 to the gate, a drain connected to the fan through the fuse F1 and the terminals P1 is connected to power supply VCC, and a source are connected in series with a diode D1 and diode D2 and an NPN type transistor Q2, the base, the resistor R5 connected to the base of transistor Q2 and the emitter, the diode D2, resistor R5 and the emitter of transistor Q2 to ground, a C4 optocoupler U1 end and the collector of transistor Q2 connected to the power supply VCC, the collector of the transistor Q2 output alarm signal, wherein,
When pulsewidth width modulated formula signal when low, photo-coupler U1 isolates rear drive NPN type field effect transistor Q1, make power supply VCC through the terminals P 1 of wind-receiving fan, fuse F1, NPN type field effect transistor Q1, and diode in series D1 and diode D2 form the loop, this moment, resistance R 5 was by short circuit, because the clamped effect of diode D1 and diode D2, the base voltage of triode Q2 is clamped to 1.4V triode Q2 conducting, output low level; At this moment, if fan opens circuit, then triode Q2 base voltage is clamped to zero level by R5, not conducting of triode Q2, output high level signal;
When pulsewidth width modulated formula signal when being high, then photo-coupler U1 is obstructed, and Q1 is also obstructed for NPN type field effect transistor, and this moment, no matter fan normally still opened circuit, and triode Q2 base voltage is all dragged down by R5, the output high level signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320170761 CN203133225U (en) | 2013-04-08 | 2013-04-08 | Driving and state detecting circuit for DC fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320170761 CN203133225U (en) | 2013-04-08 | 2013-04-08 | Driving and state detecting circuit for DC fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133225U true CN203133225U (en) | 2013-08-14 |
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ID=48941194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320170761 Expired - Lifetime CN203133225U (en) | 2013-04-08 | 2013-04-08 | Driving and state detecting circuit for DC fan |
Country Status (1)
| Country | Link |
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| CN (1) | CN203133225U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605017A (en) * | 2013-11-06 | 2014-02-26 | 厦门雅迅网络股份有限公司 | Detection method of vehicle switch quantity signal |
| CN109541386A (en) * | 2018-11-29 | 2019-03-29 | 厦门阳光恩耐照明有限公司 | A kind of alternating current-direct current driving detection device |
-
2013
- 2013-04-08 CN CN 201320170761 patent/CN203133225U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103605017A (en) * | 2013-11-06 | 2014-02-26 | 厦门雅迅网络股份有限公司 | Detection method of vehicle switch quantity signal |
| CN103605017B (en) * | 2013-11-06 | 2018-01-23 | 厦门雅迅网络股份有限公司 | A kind of detection method of vehicle switch quantity signal |
| CN109541386A (en) * | 2018-11-29 | 2019-03-29 | 厦门阳光恩耐照明有限公司 | A kind of alternating current-direct current driving detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315700, No. 57, golden access road, Binhai Industrial Park, Xiangshan County, Ningbo, Zhejiang Patentee after: NINGBO GINLONG NEW ENERGY TECHNOLOGY Co.,Ltd. Address before: 315700, No. 57, golden access road, Binhai Industrial Park, Xiangshan County, Ningbo, Zhejiang Patentee before: Ningbo Ginlong Technologies Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 315700, No. 57, golden access road, Binhai Industrial Park, Xiangshan County, Ningbo, Zhejiang Patentee after: Jinlang Technology Co.,Ltd. Address before: 315700, No. 57, golden access road, Binhai Industrial Park, Xiangshan County, Ningbo, Zhejiang Patentee before: NINGBO GINLONG NEW ENERGY TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
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| CX01 | Expiry of patent term |