Interleaved Power Supply Control Circuit
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Solution Overview
Problem
Interleaved switching power supplies face challenges in achieving interleaved parallel control of voltage regulators under constant on-time control mode due to variable operation frequency, which complicates dynamic response and output voltage regulation.
Innovation Solution
A control circuit for interleaved switching power supplies that includes a feedback compensation signal generation circuit, a first switch control circuit to manage the on/off of the first main power switch based on inductor current, and a second switch control circuit to regulate the on-time of the second main power switch by comparing average inductor current values, ensuring a 180° phase difference and equal on-times for both voltage regulation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If interleaved parallel control of voltage regulators is implemented under constant on-time control mode, then power density and efficiency are improved, but variable operation frequency complicates dynamic response and output voltage regulation
Solution Approach 1:
The patent implements feedback control by comparing the average inductor current values from both voltage regulation circuits and using this comparison to regulate the on-time of the second main power switch. This feedback mechanism ensures that despite variable operation frequency, the output voltage remains stable and the interleaved control achieves proper synchronization, resolving the contradiction between improved power density and increased control complexity
Solution Approach 2:
The patent employs dynamic on-time regulation for the second main power switch based on real-time comparison of average inductor currents. This dynamic adjustment allows the system to adapt to variable operation frequencies while maintaining stable output voltage regulation, enabling the system to achieve both high power density and manageable control complexity through adaptive control
2Object-generated harmful factors
If interleaved control with 180° phase difference is implemented, then output voltage ripple is reduced and dynamic response is improved, but coordination between two voltage regulation circuits becomes more complex
Solution Approach 1:
The patent implements periodic action by establishing a fixed 180° phase difference between the two main power switches, where the second switch is turned on half a switching cycle after the first switch. This periodic interleaved operation effectively reduces output voltage ripple by distributing the switching events, while the phase-locked timing simplifies coordination compared to arbitrary phase control
Solution Approach 2:
The patent applies preliminary action by pre-establishing the phase relationship between the two voltage regulation circuits through delayed triggering of the second switch. By predeterminedly setting the half-cycle delay, the system achieves proper interleaved operation and ripple reduction without requiring complex real-time coordination, thus reducing overall system complexity
3Use of energy by moving object
If variable operation frequency is used to improve power conversion efficiency, then smaller transformer size and weight are achieved, but interleaved parallel control becomes difficult to implement
Solution Approach 1:
The patent uses feedback control to monitor and compare average inductor currents from both circuits, then adjusts the on-time of the second power switch accordingly. This feedback mechanism enables proper interleaved control to function effectively even under variable operation frequency conditions, allowing the system to achieve high power conversion efficiency with reduced transformer size while maintaining ease of control implementation
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the on-time parameter of the second main power switch based on the comparison of average inductor currents. This parameter adaptation allows the interleaved control system to maintain proper operation across variable frequencies, making the system both efficient and easy to control despite the variability in operating conditions
Data Source
AI summary
In one embodiment, a control circuit configured for an interleaved switching power supply, can include: (i) a feedback compensation signal generation circuit configured to sample an output voltage of the interleaved switching power supply, and to generate a feedback compensation signal; (ii) a first switch control circuit configured to compare a voltage signal indicative of an inductor current in the first voltage regulation circuit against the feedback compensation signal, and to control a first main power switch in the first voltage regulation circuit; and (iii) a second switch control circuit configured to turn on a second main power switch in the second voltage regulation circuit after half of a switching cycle after the first main power switch is turned on, and to regulate an on time of the second main power switch.