Power Supply Control Device Preventing Overlapping Switching Edges
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Solution Overview
Problem
Existing power supply control devices with multiple DC/DC converters face issues with overlapping switching edges, leading to increased noise and ripple in output voltages when input or output voltages vary, and require manual phase shift pattern adjustments, which are inefficient and circuit area-intensive.
Innovation Solution
Incorporating a delay controller and delay circuits that determine the magnitude relationship between output voltages of multiple channels and adjust clock delays to prevent overlapping switching edges, allowing for automatic phase shifting and reduced noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manual phase shift pattern adjustments are used to prevent overlapping switching edges, then noise and ripple in output voltages are reduced, but device complexity and adjustment inefficiency increase
Solution Approach 1:
The delay controller automatically determines the magnitude relationship between on-times of multiple channels and adjusts clock delays without manual intervention. The system self-regulates the phase shift patterns based on real-time operating conditions, eliminating the need for manual adjustments while preventing overlapping switching edges.
Solution Approach 2:
The patent implements dynamic adjustment of clock delays based on varying on-times of DC/DC converters. The delay controller continuously adapts the phase shift patterns according to changing operating conditions, allowing the system to maintain optimal noise reduction across different voltage and load conditions.
2Object-affected harmful factors
If fixed phase shift patterns are used to prevent overlapping switching edges, then noise is reduced, but adaptability to varying voltage conditions deteriorates
Solution Approach 1:
The delay controller dynamically adjusts clock delays based on the magnitude relationship between on-times of different channels. As input and output voltage conditions change, the on-times vary, and the delay controller automatically adapts the phase shift patterns to maintain optimal noise reduction performance across all operating conditions.
Solution Approach 2:
The system uses feedback from the on-time measurements of multiple DC/DC converter channels to automatically adjust clock delays. The delay controller continuously monitors the operating conditions and modifies the phase shift patterns accordingly, ensuring adaptability to varying voltage conditions while maintaining noise reduction.
3Object-affected harmful factors
If manual adjustments of phase shift patterns are implemented, then overlapping switching edges are prevented, but productivity and efficiency decrease
Solution Approach 1:
The delay controller automatically determines the magnitude relationship between on-times and adjusts clock delays without requiring manual intervention. The system self-configures the phase shift patterns based on real-time operating conditions, completely eliminating the need for manual adjustments and significantly improving productivity.
Solution Approach 2:
The delay controller proactively adjusts clock delays before overlapping switching edges can occur. By continuously monitoring on-times and preemptively modifying phase shift patterns, the system prevents overlapping edges without requiring reactive manual adjustments, thereby maintaining high productivity.
Data Source
AI summary
A power supply control device configured to control first and second DC/DC converters, each of which is a step-down or a step-up converter, of first and second channels respectively, wherein the step-down and step-up converters respectively include a first switch output stage including high-side and low-side transistors and a second switch output stage including a switching element and an inductor, wherein a switching voltage is generated at a node where the high-side and low-side transistors are connected or where the inductor and the switching element are connected, and the high-side transistor or the switching element is turned on during an on-time, and wherein the power supply control device includes: first and second PWM controllers performing PWM control on the first or second switch output stage in the first and second DC/DC converters respectively; and a delay controller delaying a switch voltage of a channel having a longer on-time.