EV Charging Cabinet Phase Sequence Detection for Multi-Line Power
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Solution Overview
Problem
The increasing power requirements of electric vehicle charging devices, particularly in split-type charging cabinets, often require multiple alternating current power supply lines due to the limitations of through-current capability, leading to potential device damage from incorrect cable connections when phase sequences are inconsistent.
Innovation Solution
A charging apparatus with a phase sequence detection circuit that ensures consistent phase sequences among alternating current power supply lines, using switch circuits to connect or disconnect power supply based on sequence consistency, and a direct current bus for pooling rectifier and charging circuits, allowing for efficient integration of photovoltaic and energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple alternating current power supply lines are used to meet high power requirements, then charging power capability is improved, but risk of device damage from incorrect cable connection increases
Solution Approach 1:
The phase sequence detection circuit performs preliminary detection of phase sequences before power supply is connected to the circuit groups. This advance detection prevents incorrect cable connections from causing device damage while enabling the system to safely utilize multiple power supply lines for high power charging operations.
Solution Approach 2:
The phase sequence detection circuit acts as an intermediary between the multiple alternating current power supply lines and the circuit groups. It mediates the connection by detecting phase sequences and controlling switch circuits to ensure safe power distribution, thereby resolving the contradiction between utilizing multiple power lines and preventing device damage.
2Power
If multiple alternating current power supply lines are used, then charging power capability is improved, but system complexity increases
Solution Approach 1:
The system segments power supply management by dedicating each alternating current power supply line to a specific circuit group with individual switch circuits and phase sequence detection. This segmentation approach organizes the complexity into manageable modular units while enabling high power capability through parallel operation of multiple segments.
Solution Approach 2:
The phase sequence detection circuit and switch circuits serve as intermediaries that simplify the control of multiple power supply lines. By automatically detecting phase sequences and controlling connection states, these intermediaries reduce the operational complexity despite the presence of multiple power lines, making the system easier to manage while maintaining high power capability.
Data Source
AI summary
A charging apparatus includes a plurality of first alternating current power supply lines, a plurality of first circuit groups, a first direct current bus, a first switch circuit located on each first alternating current power supply line, and a phase sequence detection circuit connected to each first alternating current power supply line. Rectifier circuits in all the first circuit groups are connected to charging circuits in all the first circuit groups via the first direct current bus. In addition, the phase sequence detection circuit is used to detect whether phase sequences of the plurality of first alternating current power supply lines are consistent. When the phase sequences are consistent, all first switch circuits are connected, or when the phase sequences are inconsistent, all first switch circuits are disconnected.