PWM Signal Synthesis Circuit for Multi-Motor Control
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Solution Overview
Problem
Existing systems require multiple integrated circuits to generate the necessary 18 PWM signals to control three three-phase motors, which increases complexity and cost.
Innovation Solution
An integrated circuit (IC) with a PWM synthesis circuit that generates an additional pair of PWM signals from one of the module's output PWM signals, reducing the number of required PWM modules and ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple integrated circuits are used to generate 18 PWM signals for three three-phase motors, then the control capability is sufficient, but the system complexity and cost increase
Solution Approach 1:
The patent merges the functionality of multiple PWM signal generators into a single integrated circuit. The IC contains a PWM generator that produces a first PWM signal, which is then fed into synthesis circuits that generate additional PWM signals. This consolidation reduces the number of separate ICs needed while maintaining the capability to control three three-phase motors requiring 18 PWM signals total.
Solution Approach 2:
The integrated circuit is designed with multi-functionality to perform both PWM signal generation and PWM signal synthesis. The same IC can generate primary PWM signals and also synthesize additional PWM signals from these primary signals, making it a universal controller capable of handling multiple motors without requiring separate dedicated ICs for each function.
2Adaptability or versatility
If multiple integrated circuits are used to generate 18 PWM signals, then the control capability is sufficient, but the cost increases
Solution Approach 1:
By combining multiple PWM generation functions into a single IC, the patent reduces the total number of components required in the system. This consolidation directly reduces material costs, assembly costs, and testing costs associated with multiple separate ICs, while maintaining the ability to generate all 18 required PWM signals for three three-phase motors.
Data Source
AI summary
In response to a rising edge on an input pulse width modulation (PWM) signal, a method includes starting a first counter, resetting a second counter, and forcing a second PWM signal to a logic low level. In response to the first counter reaching a first match value, the method includes asserting a rising edge on a first PWM signal. In response to a falling edge on the input PWM signal, the method further includes causing a falling edge of the first PWM signal, resetting the first counter, and starting the second counter. In response to the second counter reaching a second match value, the method includes asserting a rising edge of the second PWM signal.