Charging Device Leakage Detection Circuit
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Solution Overview
Problem
Existing charging technologies face challenges in ensuring charging safety due to potential short-circuits and corrosion caused by contamination, such as water, dust, or sweat, which can lead to erroneous detection and damage to both the charging apparatus and electronic devices.
Innovation Solution
A charging apparatus that incorporates a current leakage detection circuit using a serial resistor instead of high-cost components like Hall components and analog-to-digital converters, combined with an in-position detection circuit to ensure accurate detection only when the device is in position, preventing charging in case of contamination or misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall component and analog-to-digital converter are used for current leakage detection, then detection accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex components (Hall component and analog-to-digital converter) with a simple, inexpensive serial resistor for current leakage detection. This substitution maintains adequate detection functionality while dramatically reducing circuit complexity and cost, aligning with the principle of using simpler, cheaper components when sufficient for the application.
Solution Approach 2:
The patent extracts the essential detection function from a complex multi-component system (Hall component + ADC) and implements it through a single serial resistor. By taking out only the necessary element for detection and eliminating unnecessary complexity, the solution achieves the same detection purpose with minimal components.
2Productivity
If current leakage detection is performed without in-position detection, then detection speed is improved, but detection accuracy deteriorates due to erroneous detection when device is not connected
Solution Approach 1:
The patent implements in-position detection as a preliminary check before performing current leakage detection. The control circuit first determines whether the electronic device is properly connected through in-position detection, and only then proceeds to current leakage detection if the device is in position. This preliminary action prevents erroneous detection when the device is not connected, ensuring detection accuracy without significantly impacting overall detection speed.
Solution Approach 2:
The patent uses feedback control where the in-position detection result feeds into the decision of whether to perform current leakage detection. The control circuit receives feedback from the in-position detection circuit and adjusts its detection strategy accordingly, enabling current leakage detection only when appropriate, thus maintaining both speed and accuracy.
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
This solution simplifies the detection process, reduces costs, and enhances charging safety by accurately determining current leakage only when the device is properly connected, thereby preventing damage from short-circuits and corrosion.
Implementation Method 1
the current leakage detection circuit includes a second voltage conversion circuit and a serial resistor, where an input end of the second voltage conversion circuit is connected to the output end of the first voltage conversion circuit, an output end of the second voltage conversion circuit is connected to the voltage output end by using the serial resistor
Data Source
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AI summary
A charging apparatus is disclosed, including a charging circuit, a current leakage detection circuit, a control circuit, an in-position detection circuit, and a voltage output end. The charging circuit includes a first voltage conversion circuit and a first switch; the current leakage detection circuit includes a second voltage conversion circuit and a serial resistor, and the current leakage detection circuit is configured to: detect whether current leakage occurs between the voltage output end and the ground, and output a current leakage detection result by using the voltage output end; the first voltage conversion circuit is configured to convert an alternating current voltage into a first direct current voltage; the second voltage conversion circuit is configured to convert the first direct current voltage into a second direct current voltage that does not trigger charging of an electronic device; the in-position detection circuit is configured to detect whether the electronic device is in position to obtain an in-position signal; and the control circuit is configured to: when it is determined, based on the current leakage detection result, that no current leakage occurs and it is determined that the electronic device is in position, close the first switch, so that an output of the charging circuit is able to charge the electronic device, and when it is determined that current leakage occurs or that the electronic device is not in-position, open the first switch to prevent the charging.