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Pulse width modulation output adjustable voltage circuit and using method thereof

A technology of voltage circuit and pulse width modulation, applied in the direction of pulse duration/width modulation, etc., can solve the problems of complex circuit and expensive DAC chip, and achieve the effect of simple circuit, improved reliability and high precision

Pending Publication Date: 2021-01-22
NANJING IOT SENSOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] DAC chips are generally more expensive, and the circuit is complex

Method used

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  • Pulse width modulation output adjustable voltage circuit and using method thereof
  • Pulse width modulation output adjustable voltage circuit and using method thereof

Examples

Experimental program
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Effect test

Embodiment

[0037] Such as figure 1 As shown, this embodiment provides a pulse width modulation output adjustable voltage circuit, including a signal shaping circuit, a signal conversion circuit, a signal amplification circuit and an SOC controller,

[0038] The signal shaping circuit is used to convert the power supply input voltage VCC into a system power supply VCC1 to supply power to the SOC controller and resistors;

[0039] The signal conversion circuit is used to convert the input voltage of the power supply into a set of negative power supply-VCC2 to supply power to the negative power supply of the operational amplifier;

[0040] The signal amplification circuit is used to amplify the voltage output by the signal shaping circuit and the signal conversion circuit through the signal amplification circuit to obtain a voltage, and the voltage is 0-VCC1;

[0041] The voltage value is positively related to the PWM duty cycle.

[0042] Specifically:

[0043] The signal amplifying circ...

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PUM

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Abstract

The invention discloses a pulse width modulation output adjustable voltage circuit and a use method thereof; the pulse width modulation output adjustable voltage circuit comprises a signal shaping circuit, a signal conversion circuit, a signal amplification circuit and an SOC controller, the signal shaping circuit is used for converting a power supply input voltage VCC into a system power supply VCC1 to supply power to the SOC controller and a resistor; wherein the signal conversion circuit is used for converting a power supply input voltage into a group of negative power supplies VCC2 to supply power to the negative power supplies of the operational amplifier; and the signal amplification circuit is used for amplifying the voltage output by the signal shaping circuit and the signal conversion circuit through the signal amplification circuit to obtain a voltage, and the voltage is 0-VCC1. According to the invention, the second-order filtering characteristic of the RC circuit is utilized, and the amplification function of the operational amplifier on the voltage signal is combined, so that the circuit design cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of voltage control, and relates to a pulse width modulation output adjustable voltage circuit and a use method thereof. Background technique [0002] The output adjustable voltage generally uses the DAC chip, through the SPI interface or IIC interface of the SOC controller, according to the DAC control command word protocol, and adopts the bus mode to configure the output of the DAC chip, which has reached a required arbitrary voltage. . [0003] DAC chips are generally more expensive and have complex circuits. There are high demands on cost. [0004] Using cheap resistors and capacitors and operational amplifiers, according to the application of basic circuit knowledge, the functions achieved by expensive dedicated DAC chips can be realized. Contents of the invention [0005] In order to solve the above technical problems, the present invention aims to provide a pulse width modulation output adjustable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K7/08
CPCH03K7/08
Inventor 虞峰毛健杨金义
Owner NANJING IOT SENSOR TECH
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