Hybrid Dual-Phase Step-Up Power Conversion System
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Solution Overview
Problem
Conventional dual-phase step-up power conversion systems are cost-ineffective due to the large number of power switches and capacitors required, leading to high power dissipation and inefficiency in portable devices like mobile phones and digital cameras, which need high voltage for backlight illumination.
Innovation Solution
A hybrid dual-phase step-up power conversion system with a reduced number of switches and capacitors is implemented, utilizing a first and second leg with cross-coupled capacitors and inductors to achieve a step-up ratio of 1:4, reducing silicon area and external components, and employing a dual-phase controller for efficient gate drive signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a conventional dual-phase step-up power conversion system is used to achieve high step-up ratio (1:4 or higher), then the output voltage requirement is met, but the number of power switches and capacitors increases, leading to high power dissipation and high cost
Solution Approach 1:
The patent merges the boost converter and charge pump converter into a hybrid configuration where they share common components (inductors, capacitors, and control circuitry). This integration reduces the total number of discrete components while maintaining the high step-up ratio capability, thereby reducing power dissipation and cost without sacrificing the required voltage multiplication
2Power
If a conventional boost converter with high step-up ratio (1:4 or higher) is used, then the output voltage requirement is met, but the conversion efficiency decreases
Solution Approach 1:
The patent segments the power conversion process into two distinct stages: a boost converter stage for initial voltage elevation and a charge pump converter stage for final voltage multiplication. This segmentation allows each stage to operate at optimized duty cycles and switching frequencies, improving overall conversion efficiency while achieving the required high step-up ratio through coordinated operation of both stages
3Power
If a cascaded power conversion system with boost converter and charge pump converter is used, then conversion efficiency is improved, but the number of components and cost increase
Solution Approach 1:
The patent designs the hybrid system with multi-functional components that serve dual purposes. For example, the same inductors and capacitors are used by both the boost converter and charge pump converter stages, and the control circuitry manages both conversion processes. This universality reduces the total component count and manufacturing cost while preserving the efficiency benefits of the cascaded architecture
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 hybrid system achieves efficient power conversion with reduced power dissipation and cost, providing a more reliable and cost-effective solution for high voltage applications in portable devices by minimizing the number of components and optimizing switch operation.
Implementation Method 1
The inductor is coupled between an input power source and the common node of the diode and the MOSFET transistor
Implementation Method 2
The output filter may be implemented as a capacitor
Data Source
AI summary
A hybrid dual-phase step-up power conversion system includes a first leg including a first switch, a second switch and a third switch connected in series between an output terminal of the hybrid dual-phase step-up power conversion system and ground, a second leg including a fourth switch, a fifth switch and a sixth switch connected in series between the output terminal of the hybrid dual-phase step-up power conversion system and ground, and a first capacitor and a second capacitor cross-coupled between the first leg and the second leg, wherein switches of the first leg and switches of the second leg are configured such that a sum of a voltage across the first capacitor and a voltage across the second capacitor is fed into the output terminal of the hybrid dual-phase step-up power conversion system.