DC Charging Pile Control Pilot Abnormality Detection Circuit
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Solution Overview
Problem
Existing DC charging piles face challenges in detecting control pilot abnormalities, such as short-circuits or open-circuits, which can lead to errors due to the modem's delayed response, compromising immediate protection during the charging process.
Innovation Solution
A circuit and method that includes a detection circuit with a DC converter, rectifier, and control pilot signal isolation circuitry, combined with software, to monitor and isolate control pilot signals, enabling real-time detection of voltage level anomalies and sending protection messages within 50 μs to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a modem is used to detect and transmit control pilot status, then communication functionality is achieved, but response time is delayed causing inability to provide immediate protection
Solution Approach 1:
The patent introduces an intermediary hardware detection circuit that independently monitors control pilot signals and directly triggers protection actions without waiting for modem processing. This intermediary circuit acts as a mediator between the control pilot signal and the protection mechanism, enabling immediate response while the modem handles communication tasks.
Solution Approach 2:
The patent replaces the software-based modem detection mechanism with a hardware-based detection circuit that uses electronic signal processing and direct electrical connections. This substitution of mechanical/electronic system for software-based system eliminates processing delays and provides immediate hardware-level response to abnormal conditions.
2Speed
If hardware detection circuit is added to enable real-time detection, then response speed is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection functionality into a dedicated hardware detection circuit that operates independently from the main control system. This segmentation allows the detection function to be implemented with minimal additional complexity while achieving real-time response, as the detection circuit processes signals in parallel rather than adding complexity to the existing software architecture.
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
Ensures immediate protection of the DC charging pile by accurately detecting abnormal control pilot states, preventing damage from short or open circuits and ensuring safe and reliable charging operations.
Implementation Method 1
a DC converter for converting a DC input voltage into two DC output reference voltage levels, which represents a first reference voltage level and a second voltage level respectively
Implementation Method 2
a rectifier circuit electrically coupled to the control pilot signal generating circuit for filtering out negative voltage signal of the generated control pilot signals
Implementation Method 3
a control pilot signal isolation circuitry electrically coupled to the DC converter and the rectifier circuit for providing isolated control pilot signals to the control circuit
Data Source
AI summary
A hardware together with a software are used to implement a control pilot (CP) status detection for protecting a DC charging pile when errors happens, such as short circuit or open circuit, at CP point. The circuit for detecting the abnormality of the CP point includes a detection circuit, which is coupled to a CP signal generating circuit of the charging pile to provide an abnormal state detection when an electrical vehicle is electrically connected to the DC charging pile, and output the detected CP signal to a control circuit. It includes a DC voltage converter that converts a DC input voltage into two DC output reference voltage levels, a rectifier circuit to filter out the negative potential of the CP signal generating by the CP signal generating circuit, and a CP signal isolation circuit, connected to the rectifier circuit to provide isolated CP signals to the control circuit.