Shielded EV Charger Pilot Wiring for Long Conduit Runs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing EVSE Smart Breaker Charger systems face communication degradation due to capacitive coupling and moisture presence in conduits, limiting the maximum installation distance to 250 feet.
Innovation Solution
The implementation of a coaxial cable shielded control pilot (CP) conductor or a shielded twisted pair wiring within the conduit to transmit bidirectional CP communications and control signals, effectively reducing capacitive coupling and extending the maximum conduit length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unshielded conductors are used in conduit, then installation complexity is reduced, but communication reliability deteriorates due to capacitive coupling and moisture
Solution Approach 1:
The patent introduces a shielded conductor as an intermediary element between the control pilot signal and the hostile environment (moisture, capacitive coupling). The shield acts as a mediator that blocks harmful electrical interference while allowing the communication signal to pass through, thereby resolving the contradiction between using simple unshielded wiring and maintaining reliable communication in adverse conditions.
Solution Approach 2:
The patent changes the electrical parameters of the communication pathway by introducing shielding, which fundamentally alters the capacitance and electromagnetic coupling characteristics of the conductor system. This parameter change enables reliable communication over longer distances and in adverse environmental conditions, resolving the contradiction between simplicity and reliability.
2Length of stationary object
If conduit length is increased beyond 250 feet, then installation flexibility is improved, but communication signal quality deteriorates due to capacitive coupling
Solution Approach 1:
The shielded conductor serves as a protective intermediary that enables signal transmission over extended distances by blocking capacitive coupling to the conduit and moisture. This allows the system to achieve greater installation flexibility with conduit lengths exceeding 250 feet while maintaining communication quality.
Solution Approach 2:
The patent replaces the reliance on short conduit runs with shielded wiring technology, substituting a physical constraint (250-foot length limit) with an engineered solution (shielding) that eliminates the underlying problem of capacitive coupling accumulation over distance.
3Adaptability or versatility
If moisture is present in conduit, then environmental adaptability is improved, but electrical communication deteriorates due to high capacitance
Solution Approach 1:
The shielded conductor acts as an intermediary barrier that isolates the control pilot signal from the moisture-filled environment. The shield blocks the capacitive coupling pathway that moisture would otherwise create between the conductor and conduit, enabling communication to function reliably even when the conduit contains water or is exposed to high humidity.
Solution Approach 2:
The shielded conductor creates an electrically inert environment around the control pilot wire by providing a grounded barrier that prevents moisture and conduit walls from electrically interacting with the signal conductor. This effectively creates a protected zone that is immune to the adverse electrical effects of moisture presence.
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 significantly extends the maximum allowable length of the conduit beyond 250 feet, ensuring reliable communication and control signals between the EVSE Smart Circuit Breaker Charger and the EV, even in adverse conditions such as water presence in conduits.
Implementation Method 1
capacitive coupling between conductors and the conduit and moisture within the conduit create a situation where Control Pilot (CP) conductor communication is severely degraded
Implementation Method 2
the EVSE charging system includes a shielded control pilot (CP) conductor and ground conductor structured to bidirectionally convey CP communications
Data Source
AI summary
An electric vehicle (EV) charging system includes a load panel including an EVSE circuit breaker charger comprising an EV charger structured to supply power to an EV via power conductors, a circuit interrupter structured to interrupt current from flowing to the EV in an event of fault, and a communications component structured to transmit bidirectionally control pilot (CP) communications and control signals between the EVSE circuit breaker charger and the EV via a shielded CP conductor and a ground conductor; an EV charge handle connected to an EV cord; a conduit structured to encase the power conductors, the shielded CP conductor, the ground conductor, and a 12 V DC supply conductor structured to supply power to a status, the conductors being structured to be electrically connected to the EVSE circuit breaker charger at one end and a remote junction box at the other end.