Multi-Level Switching Power Converter Self-Calibration
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Solution Overview
Problem
Prior art multi-level switching power converters experience power loss and instability due to non-idealities causing shifts in proportion voltage levels and switching frequency, leading to inefficiencies in power conversion.
Innovation Solution
A multi-level switching power converter with a controller circuit that performs self-calibration by adjusting time periods and duty ratios to maintain the switching node voltage and conversion capacitor voltage at expected levels, using a feedback loop to generate trigger pulses, phase splitting, and timer circuits to control power switches and capacitive voltage division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If prior art multi-level switching power converters are used, then power conversion is achieved, but proportion voltage levels shift due to non-ideality causing extra power loss and switching frequency instability
Solution Approach 1:
The patent implements a feedback mechanism by monitoring the actual voltage levels of the switching node and conversion capacitor, comparing them with expected reference levels, and using the voltage differences to generate adjusting signals that correct timing deviations. This closed-loop feedback system continuously compensates for non-idealities, maintaining stable switching frequency and reducing power loss.
Solution Approach 2:
The patent dynamically adjusts timing parameters (time periods and duty ratios) based on detected voltage deviations. By changing these temporal parameters in response to measured conditions, the system compensates for circuit non-ideality, maintains proportion voltage levels, and optimizes power conversion efficiency.
2Reliability
If self-calibration is implemented to maintain voltage levels, then power loss is reduced and switching frequency is stabilized, but device complexity increases
Solution Approach 1:
The controller circuit performs self-calibration by automatically detecting its own operating conditions (voltage levels), comparing them with reference values, and generating corrective adjusting signals without external intervention. This self-service capability enables the system to maintain optimal performance while managing complexity through autonomous operation.
Solution Approach 2:
The controller circuit integrates multiple functions into a single unified structure: it generates basic switching control signals, monitors voltage levels, compares them with references, calculates adjustments, and outputs corrected timing signals. This multi-functional integration achieves the desired stability while minimizing the increase in device complexity through functional consolidation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces power loss and stabilizes the switching frequency, ensuring efficient multi-level power conversion by maintaining the desired voltage levels and proportionality, thereby enhancing the converter's performance.
Implementation Method 1
a conversion capacitor CF, configured to operably generate at least one proportion voltage level by capacitive voltage division
Data Source
AI summary
A multi-level switching power converter includes a multi-level power stage circuit which converts an input power to an output power. The power stage circuit includes an inductor, a conversion capacitor and plural power switches. The controller circuit controls the multi-level power stage circuit and includes: a feedback pulse generator circuit which generates a trigger pulse; a first timer circuit and a second timer circuit which determine a first time period and a second time period respectively according to the trigger pulse; and an adjusting circuit which adjusts the first time period according to a difference between the voltage across the conversion capacitor and a reference voltage such that an average of the voltage across the conversion capacitor is substantially equal to a level of the reference voltage.