DC to DC Converter Control System for Die Size Reduction
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Solution Overview
Problem
Existing DC to DC converters face inefficiencies and inaccuracies when stepping down or up voltages, particularly due to the use of voltage divider circuits and the complexity of buck converters, which can lead to increased die size and power consumption.
Innovation Solution
A control system for DC to DC converters that includes an error determination module, capacitor current and voltage determination modules, and a PWM module to dynamically adjust the duty cycle based on voltage errors, capacitor currents, and voltages, minimizing the number of multipliers and die size through matrix transformations and delta transforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a voltage divider circuit is used to obtain lower voltage, then the circuit is simple to implement, but the efficiency and accuracy deteriorate
Solution Approach 1:
The patent replaces passive voltage divider circuits with active switching converter circuits that use electronic switching devices (MOSFETs, IGBTs) to dynamically control voltage conversion. This substitution transforms the static resistive voltage division into a dynamic switching process, dramatically improving efficiency by minimizing power dissipation in the conversion path.
Solution Approach 2:
The patent employs pulse width modulation (PWM) to dynamically change the duty cycle parameter, allowing the converter to efficiently adjust output voltage across a wide range. By varying the switching duty cycle rather than using fixed resistance ratios, the system achieves both high efficiency and accurate voltage regulation.
2Loss of energy
If a buck converter is used to provide lower voltage, then efficiency and accuracy improve, but device complexity and die size increase
Solution Approach 1:
The patent integrates multiple control functions (voltage error detection, current sensing, duty cycle calculation, and PWM generation) into a single unified control system. By merging these previously separate functions into one integrated controller, the patent reduces overall device complexity and die size while maintaining the high efficiency benefits of the buck converter architecture.
Solution Approach 2:
The control system is designed to perform multiple functions: detecting voltage errors, sensing capacitor currents, calculating appropriate duty cycles, and generating PWM signals. This multi-functional approach eliminates the need for separate dedicated circuits for each function, thereby reducing overall system complexity.
3Device complexity
If traditional control methods are used in DC to DC converters, then the control logic is simple, but accuracy and response to voltage errors deteriorate
Solution Approach 1:
The patent implements a closed-loop feedback control system that continuously monitors the output voltage and capacitor current, compares actual values with target values, and adjusts the duty cycle accordingly. This feedback mechanism dramatically improves voltage regulation accuracy and dynamic response, compensating for the increased control logic complexity through systematic error correction.
Data Source
AI summary
An error determination module determines a voltage error based on an output voltage of a DC to DC converter, an estimated output voltage of the DC to DC converter, and a product of a predetermined delay value and a difference between a duty cycle and a target voltage. A capacitor current determination module determines a capacitor current based on the voltage error. A capacitor voltage determination module determines a capacitor voltage based on the voltage error. A duty cycle module sets the duty cycle for a sampling period based on the capacitor current and the capacitor voltage. A pulse width modulation (PWM) module controls a switching duty cycle of the DC to DC converter based on the duty cycle.