Battery Charging Circuit Control Loop Transition
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Solution Overview
Problem
Existing battery charging circuits face challenges in accurately controlling charging current, leading to potential steps during transitions between control loops, which can be undesirable in certain applications.
Innovation Solution
A battery charging circuit with a control circuit comprising system voltage, charging current, and charging transistor control loops, along with a switching control circuit, that provides compensation signals to manage system voltage and charging current, ensuring smooth control of the charging process by adjusting the operation region of the charging transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a battery charging circuit uses multiple control loops (system voltage control loop and charging current control loop) to accurately control charging current, then charging current control precision is improved, but control complexity increases and steps may occur during transitions between control loops
Solution Approach 1:
The patent introduces a charging transistor control loop as an intermediary between the system voltage control loop and the charging current control loop. This intermediate control loop uses the system voltage feedback signal to dynamically adjust the charging transistor gate voltage, thereby smoothly transitioning between different control modes without causing steps or oscillations. The intermediary control mechanism coordinates the interaction between voltage and current control, resolving the contradiction between control precision and system complexity.
2Adaptability or versatility
If the charging transistor operates in different regions to regulate system voltage and control charging current, then charging control flexibility is improved, but control stability deteriorates due to potential steps during region transitions
Solution Approach 1:
The patent implements dynamic control of the charging transistor by continuously adjusting its gate voltage based on real-time feedback from both system voltage and charging current. The charging transistor control loop dynamically transitions the transistor between saturation and linear regions based on charging conditions, ensuring smooth and stable operation. This dynamic adjustment mechanism maintains charging current stability while preserving the flexibility to adapt to different charging stages and battery conditions.
Data Source
AI summary
A battery charging circuit providing a charging current to a battery via a charging transistor. A control circuit used to control the battery charging circuit has a system voltage control loop providing a system voltage compensation signal, a charging current control loop providing a charging current compensation signal and a charging transistor control loop providing a charging regulation signal based on a charging transistor reference signal and the system voltage feedback signal.