CN208835998U - A kind of self-service rice mill power voltage step down circuit - Google Patents
A kind of self-service rice mill power voltage step down circuit Download PDFInfo
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- CN208835998U CN208835998U CN201821387820.0U CN201821387820U CN208835998U CN 208835998 U CN208835998 U CN 208835998U CN 201821387820 U CN201821387820 U CN 201821387820U CN 208835998 U CN208835998 U CN 208835998U
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Abstract
The utility model discloses a kind of self-service rice mill power voltage step down circuits, including the first voltage reduction module, the second voltage reduction module and third voltage reduction module；First voltage reduction module is provided with first input end, first filter unit, LM2596S-ADJ chip, first diode, second diode, second filter unit, first resistor, second resistance and the first output end, second voltage reduction module is provided with LM1117-3.3 chip, third voltage reduction module is provided with LM1117-5.5 chip, pass through the first decompression chip, common 24V external power supply is depressured to 7V, pass through the second voltage reduction module of setting and third voltage reduction module, the 7V reduced output voltage of the first voltage reduction module can directly be utilized, while guarantee second is depressured the operating voltage requirement of chip and third decompression chip, external power supply need not in addition be reconnected, 3.3V voltage is exported in second output terminal, third output end exports 5V voltage, to realize 7V, It is exported while 5V, 3.3V, and simplifies whole circuit structure.
Description
Technical field
The utility model relates to self-service rice mill field, especially a kind of self-service rice mill power voltage step down circuit.
Background technique
With the development of science and technology, self-service rice mill is increasingly common in people's daily life, and common is self-service
Most of rice mill has a modules such as weighings, communication, master control, these modules are often required using arriving different model and specification
Chip realizes respective function, and requirement of the chip of different model and specification to voltage is different, and the electricity of external power supply
Pressure is general higher, can exceed the voltage threshold that chip can bear, while therefore, it is necessary to which external power supply is depressured, and
And the voltage value after a variety of decompressions is provided, the driving demand of different chips could be met simultaneously.
Utility model content
To solve the above problems, the purpose of this utility model is to provide a kind of self-service rice mill power voltage step down circuit,
While decompression to external power supply, tri- kinds of voltage values of 7V, 5V, 3.3V can be provided and exported.
The technical solution adopted by the utility model to solve the problem is as follows:
A kind of self-service rice mill power voltage step down circuit, including the first voltage reduction module, the second voltage reduction module and third are depressured mould
Block；First voltage reduction module is provided with first input end, the first filter unit, the first decompression chip, first diode, second
Filter unit, first resistor, second resistance and the first output end, the first output end connection 24V external power supply, described first
It is depressured the model LM2596S-ADJ of chip, first filter unit is connect with the first input end, ground wire respectively, institute
The input terminal for stating the first decompression chip is connect with the first input end, and second filter unit and first output end connect
It connects, the output end of the first decompression chip is also connect with the cathode of the first diode, the anode of the first diode
Ground connection, first output end, first resistor, second resistance and ground wire are sequentially connected in series, the feedback end of the first decompression chip
It is connected between the first resistor and second resistance；Second voltage reduction module is provided with the second input terminal, the second decompression core
Piece and second output terminal, the model LM1117-3.3 of the second decompression chip, second input terminal is respectively with described the
The input terminal connection of one output end, the second decompression chip, the output end of the second decompression chip and second output
End connection；The third voltage reduction module is provided with third input terminal, third decompression chip and third output end, the third decompression
The model LM1117-5.0 of chip, the third input terminal are depressured chip with first output end, the third respectively
The output end of input terminal connection, the third decompression chip is connect with the third output end；The first resistor and the second electricity
The ratio of resistance is 5:1.1.
Further, first filter unit includes two first capacitors parallel with one another and the second capacitor, and described first
Capacitor is connect with the first input end, ground wire respectively, and second capacitor is connect with the first input end, ground wire respectively.
It further, further include the second diode, the anode of second diode is connect with the first input end, described
The cathode of second diode is connect with the input terminal of the first decompression chip.
Further, second filter unit includes inductance and third capacitor, output end, the electricity of the first decompression chip
Sense, third capacitor and ground wire are sequentially connected in series, and first output end is connected between the inductance and third capacitor.
Further, the resistance value of the first resistor is 10K Ω, and the resistance value of the second resistance is 2.2K Ω.
Further, second voltage reduction module further includes the 4th capacitor, and the 4th capacitor is exported with described second respectively
End, ground wire connection.
Further, the third voltage reduction module further includes the 5th capacitor, and the 5th capacitor is exported with the third respectively
End, ground wire connection.
The beneficial effects of the utility model are: a kind of self-service rice mill power voltage step down circuit that the utility model uses, leads to
The first decompression chip is crossed, common 24V external power supply is depressured to 7V, while the first filter unit is set in the first voltage reduction module
With the second filter unit, interference is effectively filtered out, voltage jump is prevented；By the way that the second voltage reduction module and third voltage reduction module is arranged,
And the second voltage reduction module and third voltage reduction module are separately connected the first output end, it can directly utilize the 7V of the first voltage reduction module
Reduced output voltage reconnects while guarantee second is depressured the operating voltage requirement of chip and third decompression chip without other
External power supply, second output terminal exports 3.3V voltage, third output end exports 5V voltage, to realize that 7V, 5V, 3.3V's is same
When export, and simplify whole circuit structure.
Detailed description of the invention
The utility model is described in further detail with example with reference to the accompanying drawing.
Fig. 1 is the circuit diagram of the first voltage reduction module of the utility model；
Fig. 2 is the circuit diagram of the second voltage reduction module of the utility model；
Fig. 3 is the circuit diagram of the utility model third voltage reduction module.
Specific embodiment
Referring to Fig.1 shown in-Fig. 3, a kind of self-service rice mill power voltage step down circuit of the utility model, including the first decompression
Module, the second voltage reduction module and third voltage reduction module；It is single that first voltage reduction module is provided with the filtering of first input end 1, first
Member 2, first is depressured chip LM1, first diode D2, the second diode D1, the second filter unit 3, first resistor R1, the second electricity
R2 and the first output end 4 are hindered, first output end 4 connects 24V external power supply, the model of the first decompression chip LM1
LM2596S-ADJ, first filter unit 2 include two first capacitor C34 parallel with one another and the second capacitor C1, described
First capacitor C34 is connect with the first input end 1, ground wire respectively, the second capacitor C1 respectively with the first input end
1, ground wire connects, and the anode of the second diode D1 is connect with the first input end 1, the cathode of the second diode D1
It is connect with the input terminal of the first decompression chip LM1, second filter unit 3 includes inductance L1 and third capacitor C2, institute
Output end, inductance L1, third capacitor C2 and the ground wire for stating the first decompression chip LM1 are sequentially connected in series, and first output end 4 connects
Between the inductance L1 and third capacitor C2, it is described first decompression chip LM1 output end also with the first diode D2
Cathode connection, the plus earth of the first diode D2, first output end 4, first resistor R1, second resistance R2 and
Ground wire is sequentially connected in series, and the feedback end of the first decompression chip LM1 is connected between the first resistor R1 and second resistance R2；
Second voltage reduction module is provided with the second input terminal 5, second decompression chip LM2 and second output terminal 6, the second decompression core
The model LM1117-3.3 of piece LM2, second input terminal 5 are depressured core with first output end 4, described second respectively
The input terminal of piece LM2 connects, and the output end of the second decompression chip LM2 is connect with the second output terminal 6；The third drop
Die block is provided with third input terminal 7, third decompression chip LM3 and third output end 8, the type of the third decompression chip LM3
Number be LM1117-5.0, the third input terminal 7 respectively with first output end 4, the third decompression chip LM3 it is defeated
Enter end connection, the output end of the third decompression chip LM3 is connect with the third output end 8；The first resistor R1 and
The ratio of two resistance R2 is 5:1.1, and preferably, the resistance value of first resistor R1 described in the present embodiment is 10K Ω, described
The resistance value of second resistance R2 is 2.2K Ω.
Second voltage reduction module further includes the 4th capacitor C3, the 4th capacitor C3 respectively with the second output terminal 6,
Ground wire connection；The third voltage reduction module further includes the 5th capacitor C4, the 5th capacitor C4 respectively with the third output end
8, ground wire connects.The 4th capacitor C3 and the 5th capacitor C4 primarily serves the effect of filtering.
First voltage reduction module by the first filter unit 2 of setting, make by the filtering that input terminal is played in circuit work
With, while it being effectively prevent voltage jump, improve the stability of circuit operation；It, can by the way that the second diode D1 is arranged in input terminal
To prevent electrode reversed；By the way that the second filter unit 3 is arranged, the filter action of output end is played in circuit work, while
First diode D2 is arranged in output end, can play clamping action, achieve the effect that overvoltage protection；By being depressured chip first
The feedback end of LM1 connects first resistor R1 and second resistance R2, provides a benchmark electricity to the inside of the first decompression chip LM1
Pressure, and the ratio of first resistor R1 and second resistance R2 are 5:1.1, by formula Vout=(R1/R2+1) * 1.25, so that the
The voltage of one output end 4 output 7V.Further, by the second voltage reduction module of setting and third voltage reduction module, and second is depressured
Module and third voltage reduction module are separately connected the first output end 4, can directly utilize the 7V reduced output voltage of the first voltage reduction module,
While guaranteeing the operating voltage requirement of the second decompression chip LM2 and third decompression chip LM3, external electrical is reconnected without other
Source, second output terminal 6 exports 3.3V voltage, third output end 8 exports 5V voltage, thus defeated while realizing 7V, 5V, 3.3V
Out, and whole circuit structure is simplified.
The above, the only preferred embodiment of the utility model, the utility model are not limited to above-mentioned implementation
Mode, as long as its technical effect for reaching the utility model with identical means, all should belong to the protection scope of the utility model.
Claims (7)
1. a kind of self-service rice mill power voltage step down circuit, it is characterised in that: including the first voltage reduction module, the second voltage reduction module and
Three voltage reduction modules；First voltage reduction module is provided with first input end (1), the first filter unit (2), the first decompression chip
LM1, first diode D2, the second filter unit (3), first resistor R1, second resistance R2 and the first output end (4), described
One output end (4) connects 24V external power supply, the model LM2596S-ADJ of the first decompression chip LM1, first filter
Wave unit (2) is connect with the first input end (1), ground wire respectively, the input terminal and described the of the first decompression chip LM1
One input terminal (1) connection, second filter unit (3) connect with first output end (4), the first decompression chip
The output end of LM1 is also connect with the cathode of the first diode D2, the plus earth of the first diode D2, and described first
Output end (4), first resistor R1, second resistance R2 and ground wire are sequentially connected in series, the feedback end connection of the first decompression chip LM1
Between the first resistor R1 and second resistance R2；Second voltage reduction module is provided with the second input terminal (5), the second decompression
Chip LM2 and second output terminal (6), the model LM1117-3.3 of the second decompression chip LM2, second input terminal
(5) it is connect respectively with the input terminal of first output end (4), the second decompression chip LM2, the second decompression chip
The output end of LM2 is connect with the second output terminal (6)；The third voltage reduction module is provided with third input terminal (7), third drop
Press chip LM3 and third output end (8), the model LM1117-5.0 of the third decompression chip LM3, the third input
End (7) is connect with the input terminal of first output end (4), third decompression chip LM3 respectively, and the third is depressured chip
The output end of LM3 is connect with the third output end (8)；The ratio of the first resistor R1 and second resistance R2 is 5:1.1.
2. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: first filtering is single
First (2) include two first capacitor C34 parallel with one another and the second capacitor C1, the first capacitor C34 respectively with described first
Input terminal (1), ground wire connection, the second capacitor C1 are connect with the first input end (1), ground wire respectively.
3. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: further include the two or two pole
Pipe D1, the anode of the second diode D1 are connect with the first input end (1), the cathode of the second diode D1 and institute
State the input terminal connection of the first decompression chip LM1.
4. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: second filtering is single
First (3) include inductance L1 and third capacitor C2, output end, inductance L1, third capacitor C2 and the ground of the first decompression chip LM1
Line is sequentially connected in series, and first output end (4) is connected between the inductance L1 and third capacitor C2.
5. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: the first resistor R1
Resistance value be 10K Ω, the resistance value of the second resistance R2 is 2.2K Ω.
6. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: the second decompression mould
Block further includes the 4th capacitor C3, and the 4th capacitor C3 is connect with the second output terminal (6), ground wire respectively.
7. a kind of self-service rice mill power voltage step down circuit according to claim 1, it is characterised in that: the third is depressured mould
Block further includes the 5th capacitor C4, and the 5th capacitor C4 is connect with the third output end (8), ground wire respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821387820.0U CN208835998U (en) | 2018-08-24 | 2018-08-24 | A kind of self-service rice mill power voltage step down circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821387820.0U CN208835998U (en) | 2018-08-24 | 2018-08-24 | A kind of self-service rice mill power voltage step down circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208835998U true CN208835998U (en) | 2019-05-07 |
Family
ID=66310765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821387820.0U Expired - Fee Related CN208835998U (en) | 2018-08-24 | 2018-08-24 | A kind of self-service rice mill power voltage step down circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208835998U (en) |
-
2018
- 2018-08-24 CN CN201821387820.0U patent/CN208835998U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191118 Address after: Room 2205, Wenzhou World Trade Center, Danan Road, Wuma street, Lucheng District, Wenzhou City, Zhejiang Province Patentee after: Zhejiang wukungu Agricultural Technology Development Co., Ltd Address before: 201, room 518131, building A, No. 1, front Bay Road, Qianhai, Shenzhen Guangdong cooperation zone (Shenzhen Qianhai business secretary Co., Ltd.) Patentee before: Shenzhen Jincanghui Agricultural Science and Technology Development Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190507 Termination date: 20200824 |
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| CF01 | Termination of patent right due to non-payment of annual fee |