Antispark Battery Connector With Delayed Capacitor Precharge
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Solution Overview
Problem
Existing electrical connectors face issues with sparking or arcing during the installation of batteries due to the sudden connection of a battery's voltage source to uncharged input capacitance in loads, which can lead to safety hazards and connector degradation.
Innovation Solution
A battery connector design featuring a charge pin longer than the power pins, with an antispark circuit that charges the input capacitance of the load before the power pins are connected, utilizing a dissipation circuit and a delay circuit to manage the charging process, ensuring the input capacitance is charged before the full battery voltage is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power pins are connected directly to the battery without precharging the input capacitance, then the connection is simple and fast, but sparking or arcing occurs during battery installation
Solution Approach 1:
The charge pin is designed to be longer than the power pins, enabling it to make contact with the battery terminal first during insertion. This preliminary action precharges the input capacitance of the load through the dissipation circuit before the power pins establish the main power connection, thereby preventing sparking while maintaining operational simplicity
Solution Approach 2:
The charge pin acts as an intermediary element between the battery and the power pins. It provides a dedicated path through the dissipation circuit to gradually charge the input capacitance, mediating the energy transfer and preventing direct high-current discharge that would cause sparking
2Object-affected harmful factors
If a charge pin is added to precharge the input capacitance before power connection, then sparking is prevented, but the device complexity increases
Solution Approach 1:
The charge pin, dissipation circuit, and delay circuit are integrated into a single unified structure within the connector housing. The dissipation circuit combines resistive and capacitive elements to provide both precharging and timing functions, while the delay circuit uses the inherent RC time constant to automatically control the precharge duration, eliminating the need for separate control components
Solution Approach 2:
The delay circuit utilizes the natural charging characteristics of the dissipation circuit's RC time constant to automatically determine when precharging is complete. Once the input capacitance reaches sufficient charge level, the circuit self-regulates by allowing the power pins to make contact, eliminating the need for external control signals or additional active components
3Object-affected harmful factors
If the charge pin is made longer than the power pins to ensure precharging, then sparking is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The charge pin is deliberately designed with asymmetric length relative to the power pins, extending beyond them to ensure first contact with the battery terminal. This asymmetric geometry provides a built-in mechanical guarantee for precharging sequence, making the system robust against variations in insertion speed, angle, and manufacturing tolerances of other components
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 design effectively prevents sparking during battery installation, enhancing operator safety and prolonging the lifespan of the connectors by ensuring the input capacitance is charged before the power pins connect, thus reducing wear and tear.
Implementation Method 1
a dissipation circuit configured to charge the input capacitance of the load in response to a battery being coupled to the charge pin
Implementation Method 2
the delay circuit includes a thermistor, and the resistor and the thermistor are each in series with the load
Data Source
AI summary
In an embodiment, a battery connector includes: power terminals configured to be coupled to a load having an input capacitance; power pins electrically coupled to the power terminals; a charge pin, the charge pin being longer than each of the power pins; and an antispark circuit electrically interposed between the charge pin and the power terminals, the antispark circuit including: a dissipation circuit configured to charge the input capacitance of the load in response to a battery being coupled to the charge pin; and a delay circuit configured to delay charging of the input capacitance of the load for a predetermined duration after the battery is coupled to the charge pin.