Preventing Terminal Oxidation in Charging Devices with Zero-Voltage Design
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Summary
Problems
Charging devices experience terminal oxidation due to arc generation when connected and disconnected, leading to increased resistance, heat, and potential fires, which compromises safety and service life.
Innovation solutions
A charging device with an LLC half-bridge resonant power supply, a charging interface featuring engage-enabled and charge-enabled pins of different lengths, and a charging management circuit that controls the power supply to achieve soft start and zero-voltage connection during charging, and zero-current disconnection during unplugging, preventing arc oxidation.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the connector is gradually disconnected from the battery during charging, then the contact area decreases, but arc generation occurs causing terminal oxidation
Why choose this principle:
The patent applies preliminary action by controlling the power supply to stop before the connector is fully disconnected. The charging management circuit detects the disconnection state and turns off the power output in advance, ensuring zero-voltage and zero-current conditions before physical separation occurs, thereby preventing arc generation and terminal oxidation
Principle concept:
If the connector is gradually disconnected from the battery during charging, then the contact area decreases, but arc generation occurs causing terminal oxidation
Why choose this principle:
The patent implements preliminary anti-action by using the charging management circuit to detect connector disconnection and preemptively stop power output. This counteracts the potential harmful effect of arc oxidation by eliminating the voltage and current before the connector fully separates, preventing the oxidation problem before it can occur
Application Domain
Data Source
AI summary:
A charging device with an LLC half-bridge resonant power supply, a charging interface featuring engage-enabled and charge-enabled pins of different lengths, and a charging management circuit that controls the power supply to achieve soft start and zero-voltage connection during charging, and zero-current disconnection during unplugging, preventing arc oxidation.
Abstract
The present disclosure relates to a charging device. By providing a charge-enabled pin and an engage-enabled pin with different lengths in the charging interface of the charging device, the engage-enabled pin is firstly in contact with a battery when charging. At this time, a charging management circuit controls an LLC half-bridge resonant power supply to soft start. A third end of the charging management circuit outputs a signal to drive a first switch to be turned on, and the output end of the LLC half-bridge resonant power supply charges the battery, and charging soft start and zero-voltage connection are achieved. During the unplugging process, the charge-enabled pin is firstly removed from the battery, and zero-current disconnection can be achieved when unplugging the other pins of the charging interface.