CN209299138U - A kind of reduction voltage circuit based on STM32 microprocessor - Google Patents
A kind of reduction voltage circuit based on STM32 microprocessor Download PDFInfo
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- CN209299138U CN209299138U CN201821909584.4U CN201821909584U CN209299138U CN 209299138 U CN209299138 U CN 209299138U CN 201821909584 U CN201821909584 U CN 201821909584U CN 209299138 U CN209299138 U CN 209299138U
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Abstract
The utility model relates to a kind of reduction voltage circuits based on STM32 microprocessor, including power end, first capacitor, the second capacitor, step down voltage redulator, first resistor, second resistance, 3rd resistor, third capacitor, the 4th capacitor, the 4th resistance and indicator light, the utility model between power supply and ground terminal by being arranged first capacitor and the second capacitor, supply voltage is filtered, input voltage is modulated；Further, by concatenating first resistor, second resistance and 3rd resistor between the output and ground of step down voltage redulator, and the 7th pin and first resistor, the 6th pin of step down voltage redulator constitute feed circuit, carry out feedback regulation to output voltage, guarantee output voltage is preset value；And output voltage is filtered by third capacitor and the 4th capacitor in parallel, it stabilizes the output voltage, improves the reliability of reduction voltage circuit.
Description
Technical field
The utility model relates to switch power technology fields, more particularly to a kind of decompression based on STM32 microprocessor
Circuit.
Background technique
Switching Power Supply is using modern power electronics technology, and the time ratio that control switch turns on and off maintains output
A kind of power supply of burning voltage.Due to have the characteristics that light, thin power consumption is small and high efficiency and be widely used in intelligent terminal,
In the electronic products such as automated production and instrument and meter.But due to the voltage that reduction voltage circuit provides, in some cases not
The requirement of microprocessor can be reached, it is therefore desirable to increase a reduction voltage circuit between reduction voltage circuit and microprocessor, to decompression
The output voltage of circuit is depressured again, and last output voltage is used for microprocessor.
Utility model content
For overcome the deficiencies in the prior art, the utility model provides a kind of reduction voltage circuit based on STM32 microprocessor.
The technical problems to be solved in the utility model is achieved through the following technical solutions:
The utility model embodiment provides a kind of reduction voltage circuit based on STM32 microprocessor, including power end, the first electricity
Hold C1, the second capacitor C2, step down voltage redulator, first resistor R1, second resistance R2,3rd resistor R3, third capacitor C3, the 4th electricity
Hold C4, the 4th resistance R4 and indicator light D1, wherein
The top crown of first capacitor C1 be respectively connected to power end, the top crown of the second capacitor C2, step down voltage redulator
Three-prong；The bottom crown of first capacitor C1 is respectively connected to the bottom crown of ground terminal and the second capacitor C2；The of step down voltage redulator
Two pins and third pin are shorted；
6th pin of step down voltage redulator is sequentially connected the upper pole of the first end of first resistor R1, third capacitor C3 respectively
The first end and STM32 microprocessor of plate, the top crown of the 4th capacitor C4, the 4th resistance R4；Wherein, the second of first resistor R1
End is respectively connected to the first end of the 7th pin and second resistance R2 of step down voltage redulator, the second end of second resistance R2 and ground connection
3rd resistor R3 is concatenated between end；The bottom crown of third capacitor C3 is respectively connected to the bottom crown and ground terminal of the 4th capacitor C4；
Indicator light D1 is concatenated between the second end and ground terminal of 4th resistance R4；
8th pin of step down voltage redulator connects ground terminal, the first pin, the 4th pin and the 5th pipe of step down voltage redulator
Foot is empty foot.
In a specific embodiment, the second resistance R2 is variable resistance, controls described the by FPGA module
The resistance value of two resistance R2.
In a specific embodiment, first capacitor C1 is 22 microfarads, and the second capacitor C2 is 0.1 microfarad.
In a specific embodiment, third capacitor C3 is 20 microfarads, and the 4th capacitor C4 is 0.1 microfarad.
The utility model has the following beneficial effects:
1, the utility model is between power supply and ground terminal by being arranged first capacitor and the second capacitor, to supply voltage into
Row filtering, modulates input voltage；Further, by between the output and ground of step down voltage redulator concatenate first resistor,
Second resistance and 3rd resistor, and the 7th pin and first resistor of step down voltage redulator, the 6th pin constitute feed circuit, to defeated
Voltage carries out feedback regulation out, and guarantee output voltage is preset value；And by third capacitor and the 4th capacitor in parallel to output
Voltage is filtered, and is stabilized the output voltage, and the reliability of reduction voltage circuit is improved.
2, the utility model is set as variable resistance by price second resistance, and the resistance value by changing second resistance can
Change the size of output voltage, to realize the continuous purpose for changing output voltage size, therefore the decompression electricity in the present embodiment
Road is capable of providing the voltage in several modes of consecutive variations, expands the application range of reduction voltage circuit.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of reduction voltage circuit based on STM32 microprocessor provided by the utility model.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.
Embodiment one
As shown in Figure 1, Fig. 1 is a kind of circuit of reduction voltage circuit based on STM32 microprocessor provided by the utility model
Figure.The reduction voltage circuit is responsible for for the voltage that reduction voltage circuit exports being depressured again, to reach the demand of STM32 microprocessor
Voltage is completed to convert by step down voltage redulator here.
A simple declaration is done to 8 pins of step down voltage redulator first:
The first, fourth, five pin NC: empty foot；
Second pin EN: enabled control terminal, when which is lower than 0.4V, step down voltage redulator stops working；
Third pin VIN: voltage input end,；
6th pin VO: output end of pressure-stabilizing；
7th pin ADJ: output voltage adjustment end, output voltage VO=0.8 (R1+R2+R3)/R2+R3；
8th pin GND: ground terminal.
Reduction voltage circuit provided by the embodiment of the utility model, including power end, first capacitor C1, the second capacitor C2, decompression
Adjuster, first resistor R1, second resistance R2,3rd resistor R3, third capacitor C3, the 4th capacitor C4, the 4th resistance R4 and refer to
Show lamp D1, wherein
The top crown of first capacitor C1 be respectively connected to power end, the top crown of the second capacitor C2, step down voltage redulator
Three-prong；The bottom crown of first capacitor C1 is respectively connected to the bottom crown of ground terminal and the second capacitor C2；The of step down voltage redulator
Two pins and third pin are shorted；
6th pin of step down voltage redulator is sequentially connected the upper pole of the first end of first resistor R1, third capacitor C3 respectively
The first end and STM32 microprocessor of plate, the top crown of the 4th capacitor C4, the 4th resistance R4；Wherein, the second of first resistor R1
End is respectively connected to the first end of the 7th pin and second resistance R2 of step down voltage redulator, the second end of second resistance R2 and ground connection
3rd resistor R3 is concatenated between end；The bottom crown of third capacitor C3 is respectively connected to the bottom crown and ground terminal of the 4th capacitor C4；
Indicator light D1 is concatenated between the second end and ground terminal of 4th resistance R4；
8th pin of step down voltage redulator connects ground terminal, the first pin, the 4th pin and the 5th pipe of step down voltage redulator
Foot is empty foot.
Specifically, power supply is connected to the third pin namely voltage input end of step down voltage redulator in the present embodiment, pass through
Second pin is shorted to third pin, and when third pin input voltage, the second pin also receives voltage signal, the second pin
For enable pin, so that step down voltage redulator starts work.And when the second pin is not received by voltage signal, then reduction regulation
Device does not work.
It should be noted that between power supply and ground terminal and being connected to first capacitor C1 and the second capacitor C2, wherein the first electricity
Appearance C1 is electrolytic capacitor, and the second capacitor C2 is conventional capacitive, and big electrolytic capacitor is poor to the absorbability of High-frequency Interference, and
With high-frequency current, the anti-jamming effectiveness of conventional capacitive is good, uses big capacity electrolyte capacitor and low capacity here
Conventional capacitive is together in parallel, to solve the problems, such as the High-frequency Interference that may be generated in circuit.
Further, the introducing inductance of bulky capacitor is very big, cannot ignore, but this is caused by production technology, can not be simple
It eliminates.And the introducing inductance very little of small capacitances, after small capacitances and bulky capacitor are together in parallel, the introducing inductance in parallel of the two,
According to inductance in parallel formula, the total inductance after parallel connection is less than the smallest inductance, and total capacitance is equal to sum of the two, in this way, utilizing
Equivalent circuit, the performance that two capacitors are together in parallel are better than single capacitor and (had not only increased total capacitance but also reduced and drawn
Enter inductance).And the purpose of small capacitances is that the big inductance of bulky capacitor is pulled down using its small introducing inductance.First capacitor C1 and
Stable input voltage is played the role of in second capacitor C2 parallel connection.
Further, in the present embodiment, step down voltage redulator is the adjustable decompression chip of SC4215, and SC4215 is that have enabled function
Can low-dropout regulator, output electric current is 2A, output voltage 0.8-2.5V, it usually as memory power supply control chip or
Person's chipset power supply control chip.Specifically, its 6th pin is output end of pressure-stabilizing, output end of pressure-stabilizing, which is first connected to, is successively gone here and there
First resistor R1, second resistance R2 and the 3rd resistor R3 of connection realize the purpose of attrition voltage by three resistance；But
Under some cases, there is any discrepancy with preset value for the output voltage size of the 6th pin, therefore in the present embodiment, is additionally provided with feedback electricity
Road, the 7th pin of specific step down voltage redulator are connected to the second end of first resistor R1, such 6th pin, first resistor R1
Feed circuit is constituted with the 7th pin, feedback modulation is carried out to output voltage by the 7th pin, so that step down voltage redulator is defeated
Voltage reaches preset value out.
In the utility model embodiment, 3rd resistor R3 is also serially connected between second resistance R2 and ground terminal, wherein the
The resistance value of two resistance R2 is 3 kilo-ohms, and the resistance value of 3rd resistor R3 is 200 Europe, according to output voltage calculation formula VO=0.8 (R1+
R2+R3)/R2+R3 is it is found that 3rd resistor R3 can generate large effect, therefore energy by lesser resistance value to output voltage
It is enough to play the role of fine tuning to output voltage, for improving the precision of output voltage.
Further, after the first end that output voltage passes through first resistor R1, third capacitor C3 and the 4th capacitor are reached
C4 is filtered output voltage by third capacitor C3 and the 4th capacitor C4 in parallel, and removal interference improves output voltage
Stability.
Wherein, third capacitor C3 is electrolytic capacitor, and the 4th capacitor C4 is conventional capacitive, setting principle and first capacitor C1
It is arranged in parallel that principle is identical, and details are not described herein with the second capacitor C2.
Further, in the present embodiment, the end of the communication bus of the 6th pin connection of step down voltage redulator is additionally provided with
Indicating module, the indicating module include concatenated 4th resistance R4 and indicator light D1, when communication bus and STM32 microprocessor connect
When connecing, and there is output voltage in communication bus, then illustrate that circuit works normally, therefore, indicator light D1 is always on, and if communicating total
Do not have output voltage in line, then illustrating that circuit disconnects, indicator light D1 does not work.User can be simply straight according to indicator light D1
Observe the on state of circuit with seeing.Wherein, the 4th resistance R4 is current-limiting resistance, for preventing electric current is excessive from burning out indicator light
D1。
The utility model carries out supply voltage by the way that first capacitor and the second capacitor are arranged between power supply and ground terminal
Input voltage is modulated in filtering；Further, by concatenating first resistor, the between the output and ground of step down voltage redulator
Two resistance and 3rd resistor, and the 7th pin and first resistor of step down voltage redulator, the 6th pin constitute feed circuit, to output
Voltage carries out feedback regulation, and guarantee output voltage is preset value；And by third capacitor and the 4th capacitor in parallel to output electricity
Pressure is filtered, and is stabilized the output voltage, and the reliability of reduction voltage circuit is improved.
Embodiment two
On the basis of the above embodiments, the parameters in reduction voltage circuit are described in detail in the present embodiment.
Firstly, first capacitor C1 is electrolytic capacitor, 22 microfarads, the second capacitor C2 are 0.1 microfarad of conventional capacitive, to input electricity
Pressure is filtered, and stablizes input voltage；
Further, step down voltage redulator uses the adjustable decompression chip of SC4215；
Further, first resistor R1 is 10 kilo-ohms, second resistance R2 is 3 kilo-ohms, 3rd resistor R3 is 200 Europe, three
Regulation of series output voltage；
It should be noted that the resistance value of second resistance R2 passes through the internal circuit of step down voltage redulator itself in the present embodiment
It is determined, calculation formula are as follows: the resistance value of VO=0.8 (R1+R2+R3)/R2+R3, second resistance R2 can be at 1 kilo-ohms to 50,000
Change in the range of Europe.
Further, third capacitor C3 is storage electrolytic capacitor, and 22 microfarads, the 4th capacitor C4 are 0.1 microfarad of conventional capacitive, right
Output voltage is filtered, and is stabilized the output voltage；
4th resistance R4 is 47 ohm, is current-limiting resistance, prevents electric current is excessive from burning out indicator light D1；
Indicator light D1 is LED light.
In the present embodiment, input voltage 5V, after being depressured by step down voltage redulator, so that output voltage is 3.3V, into
One step, when the voltage that the 6th pin of step down voltage redulator exports is not 3.3V, pass through the 7th pin pair of step down voltage redulator
Output voltage is modulated, and finally output voltage is made to reach 3.3V.
Embodiment three
On the basis of above-described embodiment one and embodiment two, the present embodiment is specific as follows:
The second resistance R2 is variable resistance, and the resistance value of the second resistance R2 is controlled by FPGA module.
Specifically, second resistance R2 plays the role of attrition voltage in this reduction voltage circuit, voltage is reduced, by adjusting the
The resistance value of two resistance R2 enables to the output end of step down voltage redulator to export different size of voltage, therefore, in the present embodiment,
Second resistance R2 is variable resistance, can adjust its resistance according to different types of demand, particularly passes through setting FPGA mould
Block is adjusted the resistance value of variable resistance using the programmability of FPGA module, in this way, the change in resistance model of second resistance R2
The limitation for being no longer influenced by the internal circuit of reduction voltage circuit itself is enclosed, change in resistance range is bigger, and change in resistance mode is from even
Ideotype becomes discrete type, and resistance value consecutive variations is avoided to cause biggish inductive reaction.When connecting the microprocessor of different model,
Can demand according to microprocessor to power supply, the resistance value of second resistance R2 is calculated using backstepping method, and adaptability is adjusted, and is made
Reduction voltage circuit can export required voltage.
The utility model controls second resistance resistance value by FPGA module by the way that second resistance is set as variable resistance
Variation, by changing the resistance value of second resistance, so that the output voltage of this reduction voltage circuit is adjusted, and therefore, the decompression of the present embodiment
Circuit is capable of providing the voltage in several modes of consecutive variations, expands the application range of this reduction voltage circuit.
In conclusion specific case used herein a kind of is based on STM32 microprocessor to provided by the utility model
The embodiment of reduction voltage circuit be expounded, the side of the above embodiments are only used to help understand the utility model
Case and its core concept；At the same time, for those skilled in the art is being embodied based on the idea of the present invention
There will be changes in mode and application range, in conclusion the content of the present specification should not be construed as to the utility model
Limitation, the protection scope of the utility model should be subject to appended claims.
Claims (2)
1. a kind of reduction voltage circuit based on STM32 microprocessor, which is characterized in that including power end, first capacitor (C1), second
Capacitor (C2), step down voltage redulator, first resistor (R1), second resistance (R2), 3rd resistor (R3), third capacitor (C3), the 4th
Capacitor (C4), the 4th resistance (R4) and indicator light (D1), wherein
The top crown of first capacitor (C1) be respectively connected to power end, the top crown of the second capacitor (C2), step down voltage redulator
Three-prong；The bottom crown of first capacitor (C1) is respectively connected to the bottom crown of ground terminal and the second capacitor (C2)；Step down voltage redulator
The second pin and third pin be shorted；
6th pin of step down voltage redulator is sequentially connected the upper pole of the first end of first resistor (R1), third capacitor (C3) respectively
The first end and STM32 microprocessor of plate, the top crown of the 4th capacitor (C4), the 4th resistance (R4)；Wherein, first resistor (R1)
Second end be respectively connected to the 7th pin of step down voltage redulator and the first end of second resistance (R2), the of second resistance (R2)
3rd resistor (R3) is concatenated between two ends and ground terminal；The bottom crown of third capacitor (C3) is respectively connected to the 4th capacitor (C4)
Bottom crown and ground terminal；Indicator light (D1) is concatenated between the second end and ground terminal of 4th resistance (R4)；
8th pin of step down voltage redulator connects ground terminal, and the first pin, the 4th pin and the 5th pin of step down voltage redulator are
Empty foot, wherein
The first capacitor (C1) is the electrolytic capacitor of 22 microfarads, and second capacitor (C2) is the conventional capacitive of 0.1 microfarad；Institute
The electrolytic capacitor that third capacitor (C3) is 20 microfarads is stated, the 4th capacitor (C4) is the conventional capacitive of 0.1 microfarad.
2. the reduction voltage circuit according to claim 1 based on STM32 microprocessor, which is characterized in that the second resistance
(R2) it is variable resistance, the resistance value of the second resistance (R2) is controlled by FPGA module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821909584.4U CN209299138U (en) | 2018-11-20 | 2018-11-20 | A kind of reduction voltage circuit based on STM32 microprocessor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821909584.4U CN209299138U (en) | 2018-11-20 | 2018-11-20 | A kind of reduction voltage circuit based on STM32 microprocessor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209299138U true CN209299138U (en) | 2019-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821909584.4U Expired - Fee Related CN209299138U (en) | 2018-11-20 | 2018-11-20 | A kind of reduction voltage circuit based on STM32 microprocessor |
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| Country | Link |
|---|---|
| CN (1) | CN209299138U (en) |
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2018
- 2018-11-20 CN CN201821909584.4U patent/CN209299138U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20190823 Termination date: 20201120 |