Input Protection Circuit Merging Overcurrent and Overvoltage Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional overpower and overvoltage protection circuits in electronic devices are overly complex and do not align with the trend of miniaturization, necessitating a simpler solution for effective overcurrent and overvoltage protection.
Innovation Solution
An input protection circuit comprising a current detection circuit, a voltage detection circuit, a latch circuit, and an output circuit, which collaboratively detect and respond to threshold currents and voltages to control power output, providing overvoltage and overcurrent protection without external control signals, utilizing components like diodes, transistors, and resistors to manage switching voltages and currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional overpower protection circuits and overvoltage protection circuits are used, then protection function is provided, but circuit complexity increases
Solution Approach 1:
The patent combines overcurrent protection and overvoltage protection functions into a single integrated protection circuit. The circuit uses shared components such as the operational amplifier OP1, resistors R1-R4, and capacitors C1-C2 to perform both protection functions simultaneously, eliminating the need for separate protection circuits and reducing overall circuit complexity.
Solution Approach 2:
The protection circuit is designed with multi-functional components that serve multiple purposes. For example, the operational amplifier OP1 is used for both overcurrent detection (through resistor R3) and overvoltage detection (through resistor R4). The resistors and capacitors form shared voltage division and timing networks that support both protection mechanisms, making each component universally applicable to multiple protection functions.
2Reliability
If protection circuits are added to electronic devices, then device safety is improved, but device size increases
Solution Approach 1:
By merging overcurrent and overvoltage protection functions into a single compact circuit module, the patent minimizes the space required for protection circuits. The shared components and integrated design reduce the overall footprint, allowing the protection function to be added without significantly increasing device size.
Solution Approach 2:
The protection circuit employs a nested structure where multiple functional elements are contained within a compact arrangement. The operational amplifier, resistors, and capacitors are configured in a nested manner where inner components are utilized by outer components, creating a space-efficient design that fits within minimal device volume.
Data Source
AI summary
An input protection circuit includes a current detection circuit, a voltage detection circuit, a latch circuit and an output circuit. The current detection circuit receives a power input, and when an input current exceeds a threshold current, the current detection circuit outputs a control current. The voltage detection circuit is coupled to the current detection circuit, and when the input voltage exceeds a threshold voltage, the voltage detection circuit outputs a control voltage. The latch circuit is coupled to the current detection circuit and the voltage detection circuit. When the latch circuit receives the control voltage or the control current, a switching voltage outputted by the latch circuit is equal to a reference voltage. The output circuit is coupled to the current detection circuit, the voltage detection circuit and the latch circuit. When the switching voltage is equal to the reference voltage, the output circuit stops outputting a power output.