MCU chip provided built-in operational amplifier and application of MCU chip on variable frequency refrigerator

A chip and operational amplifier technology, applied in motor vector control and printed circuit, integrated circuit field, can solve the problems of high BOM cost, low table look-up accuracy, complicated printed circuit design, etc., to reduce design complexity and BOM cost, Effects of improving calculation accuracy and improving operation performance

Active Publication Date: 2018-02-09
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems of complex printed circuit design, high BOM cost, time-consuming calculation of trigonometric functions in the coordinate transformation

Method used

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  • MCU chip provided built-in operational amplifier and application of MCU chip on variable frequency refrigerator
  • MCU chip provided built-in operational amplifier and application of MCU chip on variable frequency refrigerator
  • MCU chip provided built-in operational amplifier and application of MCU chip on variable frequency refrigerator

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] as attached figure 1 , 2 As shown, an MCU chip with a built-in operational amplifier integrates operational amplifiers and resistors inside the MCU chip to build a bias amplifier circuit, and directly sends the voltage at both ends of the small resistor connected in series to the lower bridge arm of the three-phase inverter to the MCU. The chip performs processing and subsequent coordinate transformation calculations; at the same time, a hardware acceleration module is integrated inside the MCU chip, which speeds up the calculation of trigonometric functions and improves the calculation accuracy.

[0023] Using the three-resistor current sampling scheme, it is necessary to use two ADCs to simultaneously collect the phase current with the longest conduction time of the two lower bridge arms, and the other phase current is calculated by K...

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Abstract

The invention discloses an MCU chip provided with a built-in operational amplifier. An amplification biasing circuit module composed of the operational amplifier, a resistor and an either-or selectoris integrated in the MCU chip and voltage of two ends of a small resistor connected to a lower bridge arm of a three-phase inverter in series is sent to the MCU chip for processing and subsequent coordinate conversion calculation. At the same time, a hardware acceleration module is integrated in the MCU chip. The invention also provides the application of the MCU chip provided with the built-in operational amplifier on the variable frequency refrigerator. According to the invention, by adopting the MCU chip provided with the built-in operational amplifier for constructing the biasing amplification circuit, the design flexibility of a printed circuit and the BOM cost are reduced distinctively. By adopting hardware acceleration module for hardware driving of a CORDIC algorithm and FOC coordinate conversion calculation in the MCU chip, algorithm executing time is reduced distinctively and calculation precision is improved, so that the operation performance of a compressor is improved.

Description

technical field [0001] The invention relates to an MCU chip and its application method on a frequency conversion refrigerator, and belongs to the fields of integrated circuits, motor vector control and printed circuits. Background technique [0002] Most of the current frequency conversion control solutions for refrigerators use the main controller plus compressor frequency conversion controller. The compressor frequency conversion controller controls the operation of the compressor according to the rotation speed command of the main controller. Compressor variable frequency controllers mostly use FOC algorithm, need to collect IU, IV, IW three-phase current, through coordinate transformation, double closed-loop PI controller, using SVPWM modulation method to control the on-off of the upper and lower bridge arms of the three-phase inverter, In order to realize the frequency conversion control of the compressor. When collecting current, usually a small resistor is connected ...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0425G05B2219/2654
Inventor 蒲显城韩大强
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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