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Embedded system energy-saving device

An embedded system and energy-saving device technology, applied in the direction of data processing power supply, etc., can solve the problems of low power supply system efficiency, high-performance handheld battery power supply application is not optimal, etc., achieve simple and stable hardware circuit, save PCB area, and facilitate debugging Effect

Inactive Publication Date: 2014-01-29
SHAANXI HI-TECH IND CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

When the processor is in sleep mode or waiting for a response, the external power supply voltage does not drop, resulting in a relatively low efficiency of the power supply system. This method is not optimal for high-performance handheld battery-powered applications.

Method used

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  • Embedded system energy-saving device

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] see figure 1 ,

[0018] 1) First, taking STM32F103V8 as an example, the normal operating voltage range of the processor is 2.0V to 3.6V.

[0019] 2) The system power supply on the processor board supplies power to the DC / DC power supply, and the output voltage of the buck converter is set at 3.6V through the external resistor divider R1 and R2.

[0020] 3) Calculate the values ​​of the feedback resistors R2 and R3 of the DC / DC power supply, and the control voltage amplitude V C_LOW and V C_HIGH The calculation formula is:

[0021] (1)

[0022] (2)

[0023] When V OUT1 = 3.6 V, V OUT2 = 2.0 V, V FB = 0.8 V, V C_LOW = 3.3 V, V C_HIGH = 0 V and R1 = 50.1 kΩ, the values ​​of R2 and R3 can be obtained as:

[0024] (3)

[0025] (4)

[0026] 4) Insert resistor R3 in parallel with R2 with an external N-channel MOSFET.

[0027] 5) Use the GPIO voltage of the processor to drive the gate of the MOSFET tube. By controlling the switch of the ...

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Abstract

An embedded system energy-saving device comprises a processor, a step-down converter, an external first resistor R1 and an external second resistor R2. The step-down converter is connected with the processor; the external first resistor R1 and the external second resistor R2 are used for regulating the output voltage of the step-down converter; the processor is connected with an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) grid; the external n-channel MOSFET is provided with a third resistor R3 which is in parallel connection with the second resistor R2. According to the embedded system energy-saving device, the external MOSFET is utilized to change the power supply voltage when the processor is dormant or waits for a response under the condition that the normal work of the processor is not affected and accordingly the utilization efficiency of a power supply can be improved to a certain extent.

Description

technical field [0001] The invention relates to an embedded system energy saving device. Specifically, it refers to a power management device of an embedded system that adjusts a DC / DC power supply feedback resistor to complete step-down and energy saving through an external MOSFET tube. Background technique [0002] For a long time, portable consumer electronic devices have faced the challenge of high performance and low power consumption. These battery-powered systems typically use embedded processors to provide maximum processing power when processing multimedia applications and minimize power consumption during sleep mode. [0003] The power consumption of the processor is proportional to the square of the operating voltage and is also linearly proportional to the operating frequency. Therefore, reducing frequency will reduce dynamic power consumption linearly, while reducing core voltage can reduce dynamic power consumption exponentially. [0004] In traditional bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/32
Inventor 王耀斌
Owner SHAANXI HI-TECH IND CO LTD
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