Power Converter Circuit with Multi-Mode Boost Control
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Solution Overview
Problem
Conventional power converter circuits for battery charging suffer from switching losses due to high switching frequencies, which increase with frequency, and lack efficient control mechanisms for varying battery charging states.
Innovation Solution
A single-stage power converter circuit with a boost converter stage and a control circuit that operates in multiple modes based on output voltage, controlling input current in response to input voltage to manage phase differences and optimize charging current characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high switching frequencies are used in conventional power converter circuits, then the charging speed and responsiveness are improved, but switching losses increase significantly
Solution Approach 1:
The patent employs periodic switching action with variable duty cycles to control the boost converter stage. By using periodic switching with optimized duty cycle modulation, the circuit achieves efficient power conversion at reduced switching frequencies, maintaining charging speed while minimizing switching losses through controlled periodic operation rather than continuous high-frequency switching
Solution Approach 2:
The patent dynamically changes operating parameters including switching frequency, duty cycle, and conversion ratio based on battery charging state and load conditions. By adapting these parameters in real-time, the system optimizes the balance between charging speed and switching losses, allowing high-frequency operation only when necessary while operating at lower frequencies during steady-state charging to reduce losses
2Device complexity
If single-stage conversion is used, then device complexity is reduced, but control precision for varying battery states becomes more difficult
Solution Approach 1:
The patent implements dynamic control mechanisms that continuously adjust the duty cycle and switching parameters based on real-time battery state measurements. This dynamic adaptation allows a single-stage converter to precisely control charging across varying battery states by continuously optimizing operating parameters, achieving control precision comparable to multi-stage systems while maintaining structural simplicity
Solution Approach 2:
The patent incorporates feedback control loops that monitor battery voltage, current, and state of charge, then use this information to adjust the converter's operation. The feedback mechanism enables precise control of charging parameters by comparing actual battery state with target values and making real-time corrections, allowing single-stage conversion to achieve the control precision traditionally requiring multiple stages
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 switching losses and efficiently manages battery charging by controlling input current in response to input voltage, maintaining optimal charging states and reducing voltage drops across resistive components.
Implementation Method 1
a boost converter stage coupled between the input terminals and the output terminals
Data Source
AI summary
A power converter circuit includes input terminals configured to receive an input voltage and an input current and output terminals configured to provide an output voltage and an output current. A boost converter stage is coupled between the input terminals and the output terminals. The power converter circuit is operable to operate in one of a first operation mode, a second operation mode, and a third operation mode dependent on the output voltage. The first, second and third operation modes are mutually different. In each of the first, second and third operation modes, the input current is controlled dependent on the input voltage.