Integrated OBC Circuit for Electrically Excited Motor Drives
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Solution Overview
Problem
The existing electric vehicle systems have separate power supply and charging circuits, leading to increased complexity and costs due to the lack of integration between them.
Innovation Solution
An electrically excited motor drive system integrated with an on-board charger (OBC) that includes a power factor correction circuit, multiple electric energy conversion circuits, a transformer, a switch circuit, an excitation drive component, and a control component, allowing the system to switch between power supply and charging functions, thereby sharing components and reducing circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply circuit and charging circuit are separately disposed in the electric vehicle, then the reliability of each circuit is improved, but the circuit complexity and design production costs increase
Solution Approach 1:
The patent merges the power supply circuit and charging circuit into a single integrated circuit system. The power factor correction circuit, DC-AC conversion circuit, transformer, and AC-DC conversion circuit are shared between both functions. The switch circuit enables the system to alternate between power supply mode (driving the motor) and charging mode (charging the battery), resolving the contradiction by combining circuits while maintaining functional reliability through controlled operation modes.
Solution Approach 2:
The integrated circuit system is designed with multi-functionality, where the same hardware components serve dual purposes. The power factor correction circuit, DC-AC conversion circuit, transformer, and AC-DC conversion circuit can operate in different configurations to fulfill either power supply or charging functions. This universality reduces circuit complexity while maintaining the reliability needed for both distinct functions.
2Adaptability or versatility
If the power supply circuit and charging circuit are separately disposed in the electric vehicle, then the functional independence of each circuit is improved, but the design and production costs increase
Solution Approach 1:
The patent combines multiple circuits into an integrated system that reduces design and production costs. By sharing common components such as the transformer, power factor correction circuit, and conversion circuits, the manufacturing complexity is reduced while maintaining functional independence through the switch circuit that controls operation modes.
Solution Approach 2:
The integrated circuit system achieves versatility through multi-functional design. The same hardware can perform either power supply or charging functions depending on the switch circuit configuration, eliminating the need for separate dedicated circuits and thereby reducing design and production costs while preserving functional adaptability.
3Device complexity
If the power supply circuit and charging circuit are integrated into a single system, then the circuit complexity is reduced, but the reliability of simultaneous operation may deteriorate
Solution Approach 1:
The patent employs dynamic switching between operational modes using the switch circuit. The system can dynamically transition between power supply mode and charging mode, ensuring that only one function operates at a time. This dynamic control maintains operational reliability in the integrated circuit by preventing conflicting operations while reducing overall circuit complexity through component sharing.
Solution Approach 2:
The integrated circuit system uses periodic action through time-division multiplexing, where the switch circuit alternates between enabling the power supply function and the charging function. This periodic switching ensures reliable operation by sequentially activating different functions rather than attempting simultaneous operation, thereby maintaining reliability while achieving circuit integration.
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 integration simplifies the electric vehicle's circuit structure, reduces design and production costs, and enhances user experience by enabling efficient power supply and charging operations.
Implementation Method 1
a first transformer, configured to: change a voltage of alternating current power from the second electric energy conversion circuit
Implementation Method 2
a first electric energy conversion circuit, configured to: convert alternating current power from the power factor correction circuit into direct current power
Data Source
AI summary
An electrically excited motor drive system is integrated with an on-board charger (OBC), so that a power supply circuit that is in an electric vehicle and that is configured to drive an electrically excited motor can be integrated with an OBC of a dual active bridge (DAB) type. When a control component controls a switch circuit, the electrically excited motor drive system obtained after integration can separately implement a function of the power supply circuit or a function of the charging circuit in different working modes. In addition, when the electrically excited motor drive system is in different working modes, some circuits are further reused through time division. This addresses a problem that the power supply circuit cannot be integrated with the OBC of the DAB type, to reduce circuit complexity and costs of the electric vehicle.