A Method of Generating High Precision Voltage Based on Dual Pulse Width Modulation
A double pulse width modulation, high-precision technology, applied in the electronic field, can solve the problems of increased control difficulty, increased cost, and insufficient accuracy, and achieve the effects of making up for the lack of output accuracy, improving accuracy, and reducing costs
Active Publication Date: 2020-09-25
KUNMING UNIV OF SCI & TECH
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[0003] In practical engineering applications, such accuracy is often not enough. Generally, the accuracy of the control voltage is required to be 0.01V or even higher, which needs to be improved from other aspects, such as using a D / A conversion chip to precisely control the output. Voltage, or switch to a microcontroller with higher output PWM precision, etc. Using a D / A conversion chip will make the control more difficult; switching to a higher-precision microcontroller will increase the cost
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Embodiment 1
[0018] Embodiment 1: as Figure 1-3 As shown, a method for generating a high-precision voltage based on dual pulse width modulation, the method steps are as follows: In this embodiment, the voltage V to be output is set out is 2.57V, l is now set to 8 bits, and n is set to 8 bits, which makes the controller increase to 16 bits on the basis of the original 8-bit accuracy, making the resolution of the voltage reach 5÷(2 16 )≈0.0000763V; V is set to 5V; the adder circuit includes a resistor R M , R N , R f , R x , R y and two operational amplifiers; where the DC voltage V 1 Connect resistance R M One end of the DC voltage V 2 Connect resistance R N One end of the resistor R M , R N The other end is connected to the inverting input end of one of the operational amplifiers, and the resistor R f Connect the inverting input and output of one of the operational amplifiers, resistor R x One end is connected to the output end of one of the operational amplifiers, the resisto...
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The invention relates to a method for generating a high-accuracy voltage based on dual pulse width modulation (PWM). The method disclosed by the invention includes the following steps: firstly, calculating two PWM register values M and N that need to be preset in a microcontroller through a voltage to be output without adding an external D / A conversion chip to improve the accuracy of the output voltage, and outputting PWM waves with duty cycles corresponding to M and N after a PWM register is initialized; and rectifying the two paths of PWM waves that are output through a PWM rectifying circuit, connecting a direct current voltage obtained by rectification to an adder circuit to perform addition in proportion, and obtaining the direct current voltage with a higher accuracy after addition.According to the scheme of the invention, the accuracy of the output voltage can be directly improved by using a PWM waveform generator inside the microcontroller, the defect of insufficient output accuracy of an 8-bit PWM microcontroller can be remedied, and the cost brought by using other D / A conversion chips can be reduced.
Description
technical field [0001] The invention relates to a method for generating high-precision voltage based on double pulse width modulation, which belongs to the field of electronic technology. Background technique [0002] Pulse width modulation, or pulse width modulation (PWM), is to change the duty cycle of the output PWM wave by changing the PWM register, and then accurately control the magnitude of the voltage. The PWM output of microcontrollers used in the market is mostly 8-bit, which is equivalent to converting the output voltage according to 2 8 =256 to be divided into incremental gaps, calculated according to the highest output voltage of 5V, 5 / 256≈0.0195, so the incremental gap of the output voltage is 0.0195V. [0003] In practical engineering applications, such accuracy is often not enough. Generally, the accuracy of the control voltage is required to be 0.01V or even higher, which needs to be improved from other aspects, such as using a D / A conversion chip to precis...
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IPC IPC(8): H03K3/011H03K3/017H03K7/08
CPCH03K3/011H03K3/017H03K7/08
Inventor 邵玉斌杨道福钱斌龙华
Owner KUNMING UNIV OF SCI & TECH