Three Phase Charger With Switchable Topology For Wide Voltage Input
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Solution Overview
Problem
Existing battery chargers for electric vehicles face inefficiencies and high costs when handling a wide range of supply voltages, particularly in regions with varying three-phase and single-phase utility voltages, leading to reduced power output and increased component costs.
Innovation Solution
A system comprising a full wave bridge rectifier and two isolated DC to DC converters with switches that adjust positions based on the supply voltage level, allowing the chargers to efficiently handle a wide range of input voltages by configuring the converters in either Delta or Wye topology, thereby optimizing power delivery across different voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current ratings of all components are increased to handle wide input voltage variation, then the charger can maintain reasonable output power across voltage ranges, but the cost of components increases
Solution Approach 1:
The charging system is divided into three independent isolated chargers (AC/DC converters) that can be selectively connected. Each converter handles a specific voltage range, allowing the system to optimize component ratings for each segment rather than designing for the full voltage range, thereby reducing overall component costs while maintaining productivity.
Solution Approach 2:
The system dynamically reconfigures the connection topology between the three converters and the battery based on the input voltage level. Switches automatically adjust the topology (Delta for low voltage, Wye for high voltage), allowing the charger to adapt its component utilization to match the actual operating conditions, optimizing both power output and component cost efficiency.
2Adaptability or versatility
If a single-phase connection is supplied to a three-phase charger without neutral connection, then no power flows, but adding neutral connection capability increases device complexity
Solution Approach 1:
The charging device is designed with universal input capability that accepts both three-phase and single-phase connections through the same connector interface. The three independent converters with switchable topology allow the system to function in multiple modes (three-phase Delta, three-phase Wye, or single-phase), eliminating the need for separate charger designs and reducing overall system complexity.
Solution Approach 2:
The system dynamically detects the input connection type and automatically reconfigures the converter topology accordingly. When single-phase input is detected, the switches reposition to connect the appropriate converter in a configuration that utilizes the single-phase input effectively, enabling adaptability without requiring complex hardwired switches or multiple dedicated circuits.
3Productivity
If three independent isolated chargers are used to handle wide voltage range, then performance improves, but device complexity increases compared to a single charger
Solution Approach 1:
The charging system uses three independent isolated chargers (AC/DC converters) that can be selectively connected based on input voltage levels. Each converter is designed to handle a specific portion of the voltage range, and the segmentation allows the system to optimize performance for wide voltage handling while keeping each individual converter simpler and more cost-effective.
Solution Approach 2:
The three independent converters are merged into a single integrated charging system with shared control logic and unified battery connection. The converters work together as a coordinated system, with switches managing their interconnections, thereby achieving wide voltage range handling capability while presenting a unified interface to the battery and reducing overall system complexity compared to three separate standalone chargers.
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 enables efficient charging across a wide range of input voltages, reducing the voltage handling ratio by half compared to existing systems, thereby maintaining high power output while minimizing component costs and ensuring compatibility with both three-phase and single-phase charging systems.
Implementation Method 1
a full wave bridge rectifier for converting the supply AC voltage to unregulated DC voltage
Implementation Method 2
two isolated DC to DC converters for converting unregulated DC voltage from the rectifier to regulated DC voltage for charging the battery
Data Source
AI summary
A system for charging a battery from various three phase or single phase grid supply voltages includes a full wave bridge rectifier for receiving the AC supply voltage, two DC to DC converters for receiving unregulated DC output voltage from the rectifier, a first switch connected to a first input line of a first one of the two converters and a second switch connected to a first input line of a second one of the two converters, wherein each of the switches is set to a first position when the supply voltage is at a lower one of the varying voltage levels and to a second position when the supply voltage is at a higher one of the varying voltage levels.