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Switching power supply circuit based on STM32 microprocessor

A technology of switching power supply circuit and microprocessor, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problem that the power supply cannot be directly applied to the STM32 microprocessor, and achieve the effect of expanding the scope of application

Inactive Publication Date: 2020-05-19
XIAN ZHISHENG RUIXIN SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, STM32 represents the 32-bit microcontroller with ARM Cortex-M core, which has the advantages of high performance, strong real-time performance, low power consumption, and convenient low-voltage operation. However, the input voltage of the STM32 microprocessor is lower than 12V -36V, the existing power supply cannot be directly applied to the input terminal of the STM32 microprocessor, so it is necessary to design a power switch circuit that can meet the voltage requirements of the STM32 microprocessor

Method used

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  • Switching power supply circuit based on STM32 microprocessor
  • Switching power supply circuit based on STM32 microprocessor

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Embodiment 1

[0019] Such as figure 1 as shown, figure 1 It is a schematic structural diagram of a switching power supply circuit provided by an embodiment of the present invention. The embodiment of the present invention provides a switching power supply circuit based on an STM32 microprocessor, including a controller and a voltage stabilizing chip, the power supply is connected to the voltage stabilizing chip through the controller,

[0020] The first pin of the controller is connected to the power supply, the second pin of the controller is connected to the first pin of the voltage regulator chip, and the third pin of the controller is grounded;

[0021] The second pin of the voltage stabilizing chip is connected to the communication bus, and a feedback inductor L1 is arranged on the communication bus; the fourth pin of the voltage stabilizing chip is connected to the feedback inductor L1, and is connected in series with the second pin of the voltage stabilizing chip to form a feedback ...

Embodiment 2

[0039] On the basis of the above-mentioned embodiments, this embodiment describes various parameters in the switching power supply circuit in detail.

[0040] First, the input voltage of the power supply terminal is 12V, and the voltage regulator chip is LM2596 chip.

[0041] The first capacitor C1 is an electrolytic capacitor with a voltage of 100 microfarads and a withstand voltage of 35V, which is an energy storage capacitor; the second capacitor C2 is an ordinary capacitor with a value of 0.1 microfarads; the first capacitor C1 and the second capacitor C2 are connected in parallel to the incoming line of the power supply filtering.

[0042] The third capacitor C3 is 0.1 microfarads, the first resistor R1 is 47 kohms, and the second resistor R2 is 47 kohms. The three are connected in series between the power supply terminal and the ground terminal, and connected to the fifth pin of the voltage regulator chip ( Enable end) connected to form a delay start circuit, used to pr...

Embodiment 3

[0048] On the basis of above-mentioned embodiment one and embodiment two, this embodiment is specifically as follows:

[0049] The first resistor R1 is a variable resistor, and the resistance value of the first resistor R1 is controlled by an FPGA module.

[0050] Specifically, the first resistor R1 plays the role of consuming voltage and reducing the voltage in the switching power supply circuit. By adjusting the resistance value of the first resistor R1, the output terminal of the voltage stabilizing chip can output voltages of different sizes. Therefore, this In the embodiment, the first resistor R1 is a variable resistor, and its resistance can be adjusted according to different types of requirements. Specifically, by setting the FPGA module, the resistance value of the variable resistor can be adjusted by using the programmability of the FPGA module. In this way, The resistance variation range of the first resistor R1 is no longer limited by the internal circuit of the vo...

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Abstract

The invention relates to a switching power supply circuit based on an STM32 microprocessor, and the circuit is characterized in that a first capacitor and a second capacitor are connected in parallelto filter a power incoming line. A third capacitor, a first resistor and a second resistor are connected in series between the power supply end and the grounding end and are connected with a fifth pin(enabling end) of a voltage stabilizing chip to form a delay starting circuit for protecting the voltage stabilizing chip. A feedback inductor is connected in series between the second pin and the fourth pin of the voltage stabilizing chip, and a fly-wheel diode is arranged between the second pin and the grounding end of the voltage stabilizing chip to protect the voltage stabilizing chip. A fourth capacitor and a fifth capacitor are connected in parallel to filter an output voltage. The switching power supply circuit is connected with a microprocessor, and an external power supply is adjusted through the voltage stabilizing chip, so that required stable voltage is provided for the STM32 microprocessor.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply circuit based on an STM32 microprocessor. Background technique [0002] Switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switch on and off to maintain a stable output voltage. Due to its lightness, thinness, low power consumption and high efficiency, it is widely used in electronic products such as smart terminals, automation products and instruments. [0003] In the prior art, STM32 represents the 32-bit microcontroller with ARM Cortex-M core, which has the advantages of high performance, strong real-time performance, low power consumption, and convenient low-voltage operation. However, the input voltage of the STM32 microprocessor is lower than 12V -36V, the existing power supply cannot be directly applied to the input terminal of the STM32 microprocessor, so it is nece...

Claims

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Application Information

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IPC IPC(8): H02M1/00
CPCH02M1/00H02M1/0003H02M1/0006H02M1/0012
Inventor 张亮李艳娥刘玲玲
Owner XIAN ZHISHENG RUIXIN SEMICON TECH CO LTD
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