PWM Phase Current Balancing via Non-Modulated Edge Bias
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Solution Overview
Problem
In multiphase converters like fully-integrated voltage regulators (FIVRs), inadequate current balancing leads to performance degradation and reliability issues due to over-current and inductor saturation.
Innovation Solution
A current-balancing method that controls the non-modulating edge of PWM signals by comparing the phase current with the average current and adjusting the duty cycle accordingly, using a PCB module that integrates error calculation and delay adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current balancing control is implemented in multiphase converters, then performance and reliability are improved, but device complexity increases
Solution Approach 1:
The system uses each phase's own current signal to generate its balancing control signal. The current sensor detects the current of each phase, and the control circuit generates the balancing signal based on this detected current, making each phase self-regulating without requiring external intervention or complex centralized control.
Solution Approach 2:
The current balancing control is implemented independently for each phase. Each phase has its own current sensor and control circuit that processes the current signal separately to generate phase-specific balancing signals, dividing the overall control system into independent modular units.
2Manufacturing precision
If duty cycle adjustment is used for current balancing, then current distribution is improved, but control complexity increases
Solution Approach 1:
The duty cycle of each phase is dynamically adjusted based on real-time current conditions. The control circuit continuously monitors the current of each phase and modifies the duty cycle accordingly, allowing the system to adapt to changing load conditions and maintain optimal current distribution.
Solution Approach 2:
The system employs feedback control where the current sensor detects the actual current of each phase, this detected signal is fed back to the control circuit, and the control circuit generates balancing signals that adjust the duty cycle based on the feedback information to achieve desired current distribution.
Data Source
AI summary
Embodiments herein relate to identifying, by phase current balancing (PCB) circuitry, an indication of whether a measured current of a pulse-width modulated (PWM) signal of a plurality of PWM signals is greater than or less than an average current of the plurality of PWM signals. Embodiments further relate to adjusting, by the PCB circuitry, a bias-value of a non-modulated edge of a duty cycle of the PWM signal. Other embodiments may be described and claimed.