Boost Converter Control Using Shared Carrier and Duty Inversion
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Solution Overview
Problem
Existing boost converter devices require separate carrier generation units for each voltage conversion unit, necessitating synchronization and increasing complexity, whereas the goal is to achieve equivalent control using the same carrier with phases differing by 180 degrees.
Innovation Solution
A boost converter device configuration where a single electronic control unit generates PWM signals for both boost converters by comparing control duties with a shared carrier, with one duty inverted to simulate the phase difference, allowing equivalent control without separate carrier generation units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate carrier generation units are used for each voltage conversion unit, then phase difference control is achieved, but device complexity increases due to synchronization requirements
Solution Approach 1:
The patent merges the carrier generation function into a single shared carrier generation unit that serves both voltage conversion units. The controller generates one carrier signal and uses it for both PWM modulations, eliminating the need for separate carrier generation units and their synchronization connections.
Solution Approach 2:
The single carrier signal performs multiple functions: it is used for generating PWM signals for both the first and second voltage conversion units. The carrier serves as a universal reference for phase difference control across multiple conversion units without requiring dedicated generation resources for each.
2Adaptability or versatility
If separate carrier generation units are used for each voltage conversion unit, then independent control is achieved, but connection complexity increases due to synchronization lines
Solution Approach 1:
The patent eliminates synchronization lines by merging the carrier generation into a single unit. The controller generates one carrier signal that is distributed to both voltage conversion units, removing the need for inter-unit synchronization connections while maintaining independent control capability through separate PWM generation paths.
3Device complexity
If the same carrier is used for both voltage conversion units, then device complexity is reduced, but equivalent phase difference control must be achieved
Solution Approach 1:
The patent inverts the conventional approach by not generating two carriers with 180-degree phase difference, but instead generating one carrier and creating complementary PWM signals through duty ratio manipulation. The first PWM signal uses duty ratio D1 and the second uses (1-D1), achieving the equivalent effect of phase difference control through duty inversion rather than carrier phase inversion.
Solution Approach 2:
The patent changes the control parameter from carrier phase difference to duty ratio complementarity. Instead of adjusting carrier phases to achieve 180-degree difference, the system maintains a single carrier and achieves the desired control effect by setting the second duty ratio as (1-D1) when the first is D1, transforming the phase difference problem into a duty ratio relationship.
Data Source
AI summary
A boost converter device includes a first boost converter, a second boost converter, and a first electronic control unit. The first electronic control unit being configured to control switching of a first upper arm based on a first pulse width modulation signal and to control switching of a first lower arm based on a first inverted signal acquired by inverting the first pulse width modulation signal. The first electronic control unit is configured to control switching of a second lower arm based on a second pulse width modulation signal and to control switching of a second upper arm based on a second inverted signal acquired by inverting the second pulse width modulation signal.