Charging Circuit Current Detection Resistor Integration
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Solution Overview
Problem
Existing charging circuits for electronic devices face challenges in providing appropriate operation voltages to various electronic elements and efficiently managing charging to prevent overcharging, often requiring complex and costly circuitry.
Innovation Solution
A charging circuit comprising a transformer with a primary and secondary coil, a storage element, a switch element, a resistor, and a current detection unit that deactivates the switch when a set current is reached, utilizing a single resistor for current detection to reduce costs and increase usable space, and incorporating a control chip with full, power, and charging signals to manage charging efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex charging circuitry is used to provide appropriate operation voltages and prevent overcharging, then charging reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple functions (voltage transformation, current detection, and charging control) into a single integrated charging circuit. The transformer includes both primary and secondary coils with a switch element coupled to the primary coil and a storage element coupled to the secondary coil, eliminating the need for separate control circuits and reducing overall system complexity while maintaining reliable charging operation.
Solution Approach 2:
The transformer serves multiple functions simultaneously: it transforms voltage from the input to the storage element, detects current through the primary coil, and provides charging control through the switch element. This multi-functional design reduces the number of separate components needed while ensuring reliable charging operation and preventing overcharging.
2Measurement precision
If multiple components are used for current detection and charging control, then charging precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates the current detection function directly into the transformer structure by using the primary coil itself for current sensing. The switch element is coupled directly to the primary coil, and the charging control is achieved through the interaction between the primary and secondary coils, eliminating the need for separate detection components and reducing manufacturing cost while maintaining precise current measurement.
3Reliability
If more charging control components are added, then overcharging prevention is improved, but usable space decreases
Solution Approach 1:
The patent combines overcharging prevention functionality into the transformer structure itself. The switch element coupled to the primary coil and the storage element coupled to the secondary coil work together to automatically control charging, eliminating the need for separate protection circuits and components that would consume additional space while ensuring reliable overcharging prevention.
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 effectively provides adjustable output voltage, reduces power consumption, and prevents overcharging by using a simple and cost-effective design that integrates well with control chips, enhancing the efficiency and adaptability of charging circuits.
Implementation Method 1
The transformer comprises a primary coil and a secondary coil
Data Source
AI summary
A charging circuit including a transformer, a storage element, a switch element, a first resistor, and a current detection unit is provided. The transformer includes a primary coil and a secondary coil. The storage element is coupled to the secondary coil. The switch element is coupled to the primary coil. The first resistor is coupled to the primary coil. The current detection unit detects current flowing through the first resistor. When the current reaches a set current, the current detection unit sends a full signal to de-activate the switch unit.