Impedance Detection Circuit Using Ramp-Up Current Breaks
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Solution Overview
Problem
Current cell phones are unable to effectively and accurately detect the impedance of external devices connected to them, limiting their ability to identify a wide range of external devices and enhancing user experience.
Innovation Solution
An impedance detection circuit and method that includes a ramp-up current generation circuit and an impedance determining circuit, which inputs a ramp-up current with multiple breaks to detect the impedance of an external device in each break time period until the impedance is acquired in the last break time period, reducing noise generation and improving detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional detection method is used, then the detection process is simple, but the impedance detection precision is low and external devices cannot be accurately identified
Solution Approach 1:
The detection process is divided into multiple break time periods within a single ramp-up current cycle. The impedance determining circuit performs detection at different stages (first break time period, second break time period, etc.) rather than using a single detection point, which improves measurement precision by capturing impedance variations throughout the current ramp-up process
Solution Approach 2:
The ramp-up current generation circuit generates a periodic current signal with multiple break time periods. This periodic action allows the impedance determining circuit to perform repeated measurements at different phases of the current cycle, improving detection accuracy through multiple sampling points while maintaining a relatively simple circuit structure
2Speed
If a large current is used for detection, then the detection speed is fast, but great pulses are generated which create noise that cannot be eliminated
Solution Approach 1:
The ramp-up current is applied periodically with multiple break time periods instead of as a single large pulse. This periodic application allows the system to achieve fast detection by completing measurements within each period while avoiding the generation of large noise-causing pulses, as the current is distributed across multiple smaller increments
Solution Approach 2:
The total detection current is segmented into multiple break time periods rather than applied as one large current pulse. Each break time period uses a smaller current increment, which maintains detection speed by completing the full sequence quickly while eliminating the harmful noise that would result from a single large current pulse
Data Source
AI summary
This document discusses, among other things, an impedance detection circuit, method, and integrated circuit, comprising a ramp-up current generation circuit and an impedance determining circuit, wherein the ramp-up current generation circuit is configured to input a ramp-up current including n breaks to a port of a device where the ramp-up current generation circuit is disposed, to which port an external device is connected, and wherein the impedance determining circuit is configured to detect an impedance of the external device in each break time period of the ramp-up current input by the ramp-up current generation circuit until the impedance of the external device is acquired by detection in the last break time period of the n breaks.