Charging Circuit Control Logic for Error-Free Switching
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Solution Overview
Problem
Existing charging circuits are complex and inefficient due to the need for high accuracy and speed in error amplifiers and compensation circuits, which are often redesigned for different systems, and suffer from error switching among control circuits with similar feedback signals.
Innovation Solution
A charging circuit with multiple feedback control circuits that receive reference and feedback signals along with a slope signal to generate feedback control signals, a constant time signal generator, and a logic circuit to control the power switch based on these signals, allowing for simple and efficient switching between control circuits without error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional control circuits with error amplifiers and compensation circuits are used, then control accuracy can be maintained, but circuit complexity increases significantly
Solution Approach 1:
The patent extracts and removes the error amplifier and compensation circuit from the traditional control circuit. Instead of using these complex components, the invention directly compares the feedback signal with the reference signal through a simple comparator to generate the control signal, thereby eliminating the problematic components while maintaining control functionality.
Solution Approach 2:
The patent creates a universal control circuit structure where the same simple comparator-based approach can be applied to different charging scenarios (single battery, multiple batteries in parallel/series). The control circuit doesn't need to be redesigned for different systems, as the same architecture handles various configurations through selective activation of control circuits.
2Measurement precision
If high accuracy and high speed error amplifiers are used in each control circuit, then control precision is improved, but the circuit becomes less efficient and more complex
Solution Approach 1:
The patent removes the error amplifier entirely from the control circuit. The feedback control signal is generated by directly comparing the feedback signal with the reference signal using a comparator, eliminating the need for high accuracy and high speed error amplifiers that were reducing charging efficiency.
Solution Approach 2:
The patent replaces expensive, complex error amplifiers with simple, low-cost comparators. The comparator provides sufficient functionality for generating control signals without the overhead of complex error amplification circuitry, improving overall system efficiency.
3Adaptability or versatility
If multiple control circuits are designed with similar feedback signals, then comprehensive control is achieved, but error switching between circuits occurs
Solution Approach 1:
The patent prevents error switching by using a selection circuit that actively selects only one control circuit to be active at a time based on voltage level comparison. The selection circuit compares feedback signals from multiple control circuits and enables only the appropriate one, preventing simultaneous operation that could cause switching errors.
Solution Approach 2:
The patent performs preliminary selection of the active control circuit before the actual charging control takes place. The selection circuit pre-determines which control circuit should be active based on voltage comparisons, ensuring that only one control circuit is enabled at any given time, thus preventing switching errors before they can occur.
4Adaptability or versatility
If compensation circuits are redesigned for different system specifications, then system adaptability is improved, but design complexity and time increase
Solution Approach 1:
The patent creates a universal control circuit architecture that works across different system specifications without requiring redesign of compensation circuits. The same comparator-based control structure and selection circuit can be used for single battery, multiple batteries in parallel, or series configurations, eliminating the need for specification-specific compensation circuit designs.
Solution Approach 2:
The patent removes the compensation circuit entirely from the design. By eliminating this component that required redesign for different specifications, the invention achieves system adaptability through the selective activation of control circuits rather than through customized compensation circuits for each application.
Data Source
AI summary
A charging circuit adopts a plurality of feedback control circuits, a constant time signal generator and a logic circuit to control the operation of a power switch. The charge circuit needs no oscillator with high frequency, error amplifier with high speed and high accuracy, or compensation circuit with complicated structure, so the system portability is highly improved.