CN205578328U - Output air -blower enable signal's circuit - Google Patents
Output air -blower enable signal's circuit Download PDFInfo
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- CN205578328U CN205578328U CN201620392138.5U CN201620392138U CN205578328U CN 205578328 U CN205578328 U CN 205578328U CN 201620392138 U CN201620392138 U CN 201620392138U CN 205578328 U CN205578328 U CN 205578328U
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Abstract
The utility model discloses an in order to disclose an output air -blower enable signal's circuit, realize output air -blower enable signal's function through discrete devices, need not to adopt again special air -blower make can the low limit driver chip of intelligence, greatly reduced the circuit cost, adopt feedback circuit in the load short circuit with field effect transistor by making it not switch on to be used for realizing the short circuit to arrive the protection of power during to the power simultaneously.
Description
Technical field
This utility model relates to electronic circuit field, is specifically related to a kind of output drum blower fan and enables the circuit of signal.
Background technology
Air conditioning for automobiles is a kind of automobile air adjusting means, is used for the temperature in automobile bodies, humidity, air cleanliness and air flow adjustment and controls at optimum state, provides comfortable environment of taking for occupant, reduces journey tired；Good work regulation is provided, to guaranteeing that the ventilation unit of important device is played in safe driving for driver；Generally comprising refrigerating plant, heating installation and compound ventilation air-changing device, this combined unit takes full advantage of the effective space of automotive interior, simple in construction, it is simple to just do, and is the most popular modern cars air conditioning system.
And must arrange in air conditioning for automobiles an aerator in air conditioning for automobiles dry, air conditioning for automobiles now has a set of control system, is controlled the various functions of air-conditioning by electronic circuit；Aerator is also driven by a kind of circuit and is controlled, and the drive circuit of existing aerator uses intelligent chip to carry out output drum blower fan enable signal, and drive circuit is not arranged short-circuit protection.
Utility model content
This utility model provides a kind of only need to use resolution element, it is not necessary to use special intelligent chip, reduces the circuit enabling signal for output drum blower fan of cost.
This utility model is achieved through the following technical solutions: a kind of output drum blower fan enables the circuit of signal, it is characterized in that: include control circuit, feedback circuit, voltage sample module, port protection module, field effect transistor, VCC power supply, current-limiting resistance, described control circuit connects the grid of field effect transistor, the source electrode of described field effect transistor connects one end of current-limiting resistance, the other end ground connection of described current-limiting resistance, the drain electrode of described field effect transistor is connected with feedback circuit and voltage sample module, the drain electrode of described field effect transistor is also connected with port protection module, it is connected between described feedback circuit and control circuit, described port protection module is also associated with VCC power supply；Also including load, MCU voltage sample port and MCU output port, described port protection module is connected to load, and described voltage sample module is connected to MCU voltage sample port, and described control circuit and feedback circuit are also connected to MCU output port；Described voltage sample module includes the 14th resistance, the 4th electric capacity and the 13rd resistance, one end of described 14th resistance is connected to MCU voltage sample port, the other end of described 14th resistance connects one end of described 4th electric capacity, the other end ground connection of described 4th electric capacity, one end of described 4th electric capacity is also connected to one end of described 13rd resistance, and the other end of described 13rd resistance is connected to the drain electrode of field effect transistor；Described control circuit includes the 5th resistance, the 6th resistance, one end of described 5th resistance is connected to MCU output port, the other end of described 5th resistance connects one end of the 6th resistance, and the other end ground connection of described 6th resistance, one end of described 6th resistance is also connected to the grid of field effect transistor；Described port protection module includes the first diode and the 3rd electric capacity; the negative pole of described first diode is connected to VCC power supply; the positive pole of described first diode is connected to one end of the 3rd electric capacity; the other end ground connection of described 3rd electric capacity, one end of described 3rd electric capacity is also connected to the drain electrode of load and field effect transistor；nullDescribed feedback circuit includes the second audion、3rd audion、4th audion、4th resistance、8th resistance、7th resistance、9th resistance、Tenth resistance、11st resistance、12nd resistance、Second electric capacity，The colelctor electrode of described second audion is connected respectively to the grid of control circuit and field effect transistor，The grounded emitter of described second audion，The base stage of described second audion connects one end of described 4th resistance，The other end of described 4th resistance connects one end and one end of the 8th resistance of the 7th resistance，Also one end with the second electric capacity, one end of described 7th resistance is connected，The other end of described 7th resistance and the other end all ground connection of the second electric capacity，The other end of described 8th resistance is connected to the colelctor electrode of the 3rd audion，The base stage of described 3rd audion connects one end of the 9th resistance，The emitter stage of described 3rd audion and the other end of the 9th resistance connect，The emitter stage of described 3rd audion is also connected to the drain electrode of field effect transistor，One end of described 9th resistance is also connected to one end of the tenth resistance，The other end of described tenth resistance connects the colelctor electrode of the 4th audion，The described base stage of the 4th audion is connected with one end of the 12nd resistance，The described other end with the 12nd resistance and the grounded emitter of the 4th audion，The most also one end with the 11st resistance, one end of described 12nd resistance is connected，The other end of described 11st resistance is connected to MCU output port.
This utility model realizes output drum blower fan by discrete component and enables the function of signal, it is not necessary to the intelligence low limit driving chip using special aerator to enable again, greatly reduces circuit cost；Use voltage sample module for tracing trouble state simultaneously, also use feedback circuit that field effect transistor cut-off makes when being shorted to power supply it be not turned on the protection for realizing being shorted to power supply.
Of the present utility model have the beneficial effect that 1) use discrete component to realize output drum blower fan to enable semiotic function, it is not necessary to use special intelligent chip again, reduce circuit cost；2) feedback circuit is used to realize being shorted to the protection of power supply；3) port protection module is set for preventing inverse electromotive force from puncturing field effect transistor and ESD electrostatic.
Accompanying drawing explanation
Fig. 1 is module circuit diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings with detailed description of the invention, this utility model is further described.
See Fig. 1 to Fig. 2, a kind of output drum blower fan enables the circuit of signal, it is characterized in that: include control circuit, feedback circuit, voltage sample module, port protection module, field effect transistor M1, VCC power supply, current-limiting resistance R1, described control circuit connects the grid of field effect transistor M1, the source electrode of described field effect transistor M1 connects one end of current-limiting resistance R1, the other end ground connection of described current-limiting resistance R1, the drain electrode of described field effect transistor M1 is connected with feedback circuit and voltage sample module, the drain electrode of described field effect transistor M1 is also connected with port protection module, it is connected between described feedback circuit and control circuit, described port protection module is also associated with VCC power supply；Also including load, MCU voltage sample port and MCU output port, described port protection module is connected to load, and described voltage sample module is connected to MCU voltage sample port, and described control circuit and feedback circuit are also connected to MCU output port；Described voltage sample module includes the 14th resistance R14, the 4th electric capacity C4 and the 13rd resistance R13, one end of described 14th resistance R14 is connected to MCU voltage sample port, the other end of described 14th resistance R14 connects one end of described 4th electric capacity C4, the other end ground connection of described 4th electric capacity C4, one end of described 4th electric capacity C4 is also connected to one end of described 13rd resistance R13, and the other end of described 13rd resistance R13 is connected to the drain electrode of field effect transistor M1；Described control circuit includes the 5th resistance R5, the 6th resistance R6, one end of described 5th resistance R5 is connected to MCU output port, the other end of described 5th resistance R5 connects one end of the 6th resistance R6, the other end ground connection of described 6th resistance R6, one end of described 6th resistance R6 is also connected to the grid of field effect transistor M1；Described port protection module includes the first diode D1 and the 3rd electric capacity C3; the negative pole of described first diode D1 is connected to VCC power supply; the positive pole of described first diode D1 is connected to one end of the 3rd electric capacity C3; the other end ground connection of described 3rd electric capacity C3, one end of described 3rd electric capacity C3 is also connected to the drain electrode of load and field effect transistor M1；nullDescribed feedback circuit includes the second audion Q2、3rd audion Q3、4th audion Q4、4th resistance R4、8th resistance R8、7th resistance R7、9th resistance R9、Tenth resistance R10、11st resistance R11、12nd resistance R12、Second electric capacity C2，The colelctor electrode of described second audion Q2 is connected respectively to the grid of control circuit and field effect transistor M1，The grounded emitter of described second audion Q2，The base stage of described second audion Q2 connects one end of described 4th resistance R4，The other end of described 4th resistance R4 connects one end and one end of the 8th resistance R8 of the 7th resistance R7，Also one end with the second electric capacity C2, one end of described 7th resistance R7 is connected，The other end of described 7th resistance R7 and the other end all ground connection of the second electric capacity C2，The other end of described 8th resistance R8 is connected to the colelctor electrode of the 3rd audion Q3，The base stage of described 3rd audion Q3 connects one end of the 9th resistance R9，The emitter stage of described 3rd audion Q3 and the other end of the 9th resistance R9 connect，The emitter stage of described 3rd audion Q3 is also connected to the drain electrode of field effect transistor M1，One end of described 9th resistance R9 is also connected to one end of the tenth resistance R10，The other end of described tenth resistance R10 connects the colelctor electrode of the 4th audion Q4，The described base stage of the 4th audion Q4 is connected with one end of the 12nd resistance R12，The described other end with the 12nd resistance R12 and the grounded emitter of the 4th audion Q4，The most also one end with the 11st resistance R11, one end of described 12nd resistance R12 is connected，The other end of described 11st resistance R11 is connected to MCU output port.
In present embodiment; this utility model output drum blower fan enables signal; load current reaches 350mA; discrete component is used to realize function; without using the intelligence low limit driving chip enabled for blower that cost is high; and can open a way and be shorted to the diagnosis on ground when output is closed, and be shorted to the diagnosis of power supply when output is opened and it can be protected.
In present embodiment, in the case of field effect transistor M1 is in cut-off state, load open circuit or be shorted to ground, MCU can detect that the drain electrode end of field effect transistor M1 is low level；In the case of field effect transistor M1 is in the conduction state, load short circuits to power supply, MCU can detect that the drain electrode end of field effect transistor M1 is high level；Therefore, MCU can identify malfunction.
In present embodiment, described VCC power supply is 12V power supply.
In present embodiment, MCU output port output high level, cause Vgs to be more than or equal to 1.2V, cause field effect transistor M1 to turn on so that load can be driven；MCU output port output low level, causes Vgs to be less than 1.2V, causes field effect transistor M1 to be ended so that load is not driven.
nullIn present embodiment，Load short circuits is to power supply，MCU output port output high level，Just can make the 4th audion Q4 conducting，And the 4th audion Q4 is to provide base voltage to result in the 3rd audion Q3 conducting for the 3rd audion Q3，When the emitter stage of the 3rd audion Q3 is connected to the source electrode of field effect transistor M1 and is shorted to power supply, voltage is 12V，3rd audion Q3 will be by the source feedback of field effect transistor M1 to the 8th resistance R8，8th resistance R8 carries out dividing potential drop，And the 8th resistance R8 is arranged with the second electric capacity C2 and is charged，The voltage making the 8th resistance R8 one end is 12*6.8/(6.8+33)=2.05V，Thus can make the second audion Q2 conducting，And the colelctor electrode of the second audion Q2 is connected with the grid of field effect transistor M1，So grid of field effect transistor M1 just has led to the cut-off of field effect transistor M1 for low level，Achieve the protection being shorted to power supply；Then MCU output port will export the low level of 500mS and export the high level of 500mS again until till the fault that is shorted to power supply is removed; ensure that this utility model will not make the breakdown damage of field effect transistor M1 under the situation of load short circuits to power supply, protect circuit.
In present embodiment, described second audion Q2 and the 4th audion Q4 is NPN type triode, and model is BC847CW, and described 3rd audion Q3 is PNP type triode, and model is BC807-40.
In present embodiment, described current-limiting resistance R1 is used for limiting branch current size, prevents electric current excessive and damages components and parts.
Protection domain of the present utility model includes but not limited to embodiment of above; protection domain of the present utility model is as the criterion with claims, replacement that any those skilled in the art making this technology is readily apparent that, deforms, improves and each fall within protection domain of the present utility model.
Claims (6)
1. the circuit of an output drum blower fan enable signal, it is characterized in that: include control circuit, feedback circuit, voltage sample module, port protection module, field effect transistor (M1), VCC power supply, current-limiting resistance (R1), described control circuit connects the grid of field effect transistor (M1), the source electrode of described field effect transistor (M1) connects one end of current-limiting resistance (R1), the other end ground connection of described current-limiting resistance (R1), the drain electrode of described field effect transistor (M1) is connected with feedback circuit and voltage sample module, the drain electrode of described field effect transistor (M1) is also connected with port protection module, it is connected between described feedback circuit and control circuit, described port protection module is also associated with VCC power supply.
A kind of output drum blower fan the most according to claim 1 enables the circuit of signal; it is characterized in that: also include load, MCU voltage sample port and MCU output port; described port protection module is connected to load; described voltage sample module is connected to MCU voltage sample port, and described control circuit and feedback circuit are also connected to MCU output port.
A kind of output drum blower fan the most according to claim 2 enables the circuit of signal, it is characterized in that: described voltage sample module includes the 14th resistance (R14), 4th electric capacity (C4) and the 13rd resistance (R13), one end of described 14th resistance (R14) is connected to MCU voltage sample port, the other end of described 14th resistance (R14) connects one end of described 4th electric capacity (C4), the other end ground connection of described 4th electric capacity (C4), one end of described 4th electric capacity (C4) is also connected to one end of described 13rd resistance (R13), the other end of described 13rd resistance (R13) is connected to the drain electrode of field effect transistor (M1).
A kind of output drum blower fan the most according to claim 2 enables the circuit of signal, it is characterized in that: described control circuit includes the 5th resistance (R5), the 6th resistance (R6), one end of described 5th resistance (R5) is connected to MCU output port, the other end of described 5th resistance (R5) connects one end of the 6th resistance (R6), the other end ground connection of described 6th resistance (R6), one end of described 6th resistance (R6) is also connected to the grid of field effect transistor (M1).
A kind of output drum blower fan the most according to claim 2 enables the circuit of signal; it is characterized in that: described port protection module includes the first diode (D1) and the 3rd electric capacity (C3); the negative pole of described first diode (D1) is connected to VCC power supply; the positive pole of described first diode (D1) is connected to one end of the 3rd electric capacity (C3); the other end ground connection of described 3rd electric capacity (C3), one end of described 3rd electric capacity (C3) is also connected to the drain electrode of load and field effect transistor (M1).
nullA kind of output drum blower fan the most according to claim 2 enables the circuit of signal，It is characterized in that: described feedback circuit includes the second audion (Q2)、3rd audion (Q3)、4th audion (Q4)、4th resistance (R4)、8th resistance (R8)、7th resistance (R7)、9th resistance (R9)、Tenth resistance (R10)、11st resistance (R11)、12nd resistance (R12)、Second electric capacity (C2)，The colelctor electrode of described second audion (Q2) is connected respectively to control circuit and the grid of field effect transistor (M1)，The grounded emitter of described second audion (Q2)，The base stage of described second audion (Q2) connects one end of described 4th resistance (R4)，The other end of described 4th resistance (R4) connects one end and one end of the 8th resistance (R8) of the 7th resistance (R7)，Also one end with the second electric capacity (C2), one end of described 7th resistance (R7) is connected，The other end of described 7th resistance (R7) and the other end all ground connection of the second electric capacity (C2)，The other end of described 8th resistance (R8) is connected to the colelctor electrode of the 3rd audion (Q3)，The base stage of described 3rd audion (Q3) connects one end of the 9th resistance (R9)，The emitter stage of described 3rd audion (Q3) and the other end of the 9th resistance (R9) connect，The emitter stage of described 3rd audion (Q3) is also connected to the drain electrode of field effect transistor (M1)，One end of described 9th resistance (R9) is also connected to one end of the tenth resistance (R10)，The other end of described tenth resistance (R10) connects the colelctor electrode of the 4th audion (Q4)，The described base stage of the 4th audion (Q4) is connected with one end of the 12nd resistance (R12)，The described other end with the 12nd resistance (R12) and the grounded emitter of the 4th audion (Q4)，The most also one end with the 11st resistance (R11), one end of described 12nd resistance (R12) is connected，The other end of described 11st resistance (R11) is connected to MCU output port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620392138.5U CN205578328U (en) | 2016-05-04 | 2016-05-04 | Output air -blower enable signal's circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620392138.5U CN205578328U (en) | 2016-05-04 | 2016-05-04 | Output air -blower enable signal's circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205578328U true CN205578328U (en) | 2016-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620392138.5U Active CN205578328U (en) | 2016-05-04 | 2016-05-04 | Output air -blower enable signal's circuit |
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| CN (1) | CN205578328U (en) |
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2016
- 2016-05-04 CN CN201620392138.5U patent/CN205578328U/en active Active
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