Motor Commutation Waveform Circuit for MCU-Free Control
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Solution Overview
Problem
Existing motor commutation waveform generating circuits rely on microprocessors or digital signal processors for calculations, leading to high costs and integration challenges, particularly in motor drive systems that require precise control and efficient commutation waveform generation.
Innovation Solution
A motor commutation waveform generating circuit that uses an edge detection circuit, angle cutting circuit, synthetic wave generating circuit, and signal combining circuit to produce commutation waveforms without relying on MCU or CPU algorithms, allowing for low-cost, high and low voltage circuit integration and easy expansion of angular resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microprocessor or digital signal processor is used to generate commutation waveforms, then calculation precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/computational system (microprocessor or digital signal processor performing mathematical operations) with an electronic circuit system. The commutation waveform generating circuit uses analog or digital electronic components to directly generate waveforms through circuit operations rather than computational algorithms, thereby reducing device complexity and cost while maintaining the ability to generate precise commutation waveforms for motor control
Solution Approach 2:
The patent extracts the waveform generation function from the central processing unit (microprocessor or digital signal processor) and implements it as a dedicated commutation waveform generating circuit. This separation allows the main processor to focus on control logic while the dedicated circuit handles waveform generation, reducing overall system complexity and cost
2Manufacturing precision
If microprocessor or digital signal processor is used for waveform generation, then control precision is improved, but integration difficulty increases
Solution Approach 1:
The patent merges the commutation waveform generating circuit with the motor drive control system into a single integrated unit. The circuit is designed to be directly integrable with the drive circuit, allowing both high-voltage and low-voltage circuits to be combined on the same substrate or package, thereby improving ease of manufacture while maintaining control precision
Solution Approach 2:
The commutation waveform generating circuit is designed with universal applicability to different motor types (three-phase motors, sensorless motors, stepping motors) and can be integrated with various drive circuit configurations. This multi-functionality simplifies manufacturing by using a single circuit design across different applications
3Measurement precision
If MCU algorithm or CPU calculation is used, then waveform accuracy is improved, but cost increases
Solution Approach 1:
The patent substitutes computational algorithms (MCU or CPU calculations) with an electronic circuit implementation. The commutation waveform generating circuit uses circuit elements (such as oscillators, modulators, or lookup tables implemented in hardware) to generate accurate waveforms directly, eliminating the need for expensive processors and their associated algorithms, thereby reducing cost while maintaining waveform accuracy
Solution Approach 2:
The patent employs simpler, less expensive circuit components to generate commutation waveforms compared to using microprocessors or digital signal processors. The circuit uses basic electronic components that are cheaper and more readily available, achieving sufficient waveform accuracy for motor control applications without requiring expensive computational hardware
Data Source
AI summary
A motor commutation waveform generating circuit is provided. The motor commutation waveform generating circuit includes: an edge detection circuit, configured to receive sensing signals of the motor and derive a clock signal indicating a commutation switching point of the motor; an angle cutting circuit, controlled by the clock signal to generate an angle indication pulse indicating a rotation angle of the motor; a synthetic wave generating circuit, using the angle indication pulse to sequentially change waveform voltages corresponding to required angles and output them in segments; and a signal combining circuit, controlled by the clock signal to combine waveform voltage signals generated by the synthetic wave generating circuit, thereby obtaining a plurality of synthetic waveforms provided to a drive control system of the motor for drive control after pulse width modulation.