Shared Half-Bridge Motor Drive for Independent Door Latch Control
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Solution Overview
Problem
Conventional motor drives for electric motors in vehicles require multiple H-Bridges and control units, leading to complex wiring, high costs, and increased complexity due to the high number of connections and signals, especially when controlling multiple motors.
Innovation Solution
A motor drive unit utilizing N ≥ 4 half-bridges, each with two switches forming a midpoint, allows for independent control of N-1 electric motors by forming H-Bridges for each motor, reducing the number of required half-bridges and enabling efficient, cost-effective, and space-saving control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional H-Bridge architecture with separate control units is used for each electric motor, then each motor can be controlled independently, but the wiring complexity and system cost increase significantly with multiple motors
Solution Approach 1:
Multiple half-bridges are merged into a single integrated motor drive unit with shared control logic. The patent combines N half-bridges (where N≥4) into one unit that can control N-1 electric motors, eliminating the need for separate control units for each motor while maintaining independent control capability through the shared control unit.
Solution Approach 2:
The motor drive unit is designed as a universal controller that can manage multiple electric motors simultaneously. The control unit within the drive unit is configured to control the switching elements of all half-bridges, enabling it to independently control multiple motors through a single multi-functional device rather than requiring dedicated control units for each motor.
2Ease of operation
If separate H-Bridges are used for each electric motor, then independent motor control is achieved, but the number of connections and signals increases, requiring more control units
Solution Approach 1:
The patent merges multiple half-bridges into a single integrated unit where N half-bridges work together to control N-1 motors. This consolidation reduces the total number of separate connections and signals compared to using individual H-Bridges for each motor, as the half-bridges share common control signals and power connections through the unified drive unit.
Solution Approach 2:
The control unit is designed as a universal controller that handles switching signals for all half-bridges simultaneously. This multi-functional control unit reduces the overall quantity of control signals needed compared to having separate control units, as it manages multiple motors through a single integrated control interface.
3Ease of operation
If multiple control units are installed to control multiple electric motors, then each motor can be controlled independently, but the system cost increases
Solution Approach 1:
The patent combines the functionality of multiple separate control units into a single control unit within the motor drive unit. This unified control approach eliminates the need to purchase and install multiple expensive control units, thereby reducing the overall system cost while maintaining the capability to independently control each electric motor through the shared control logic.
Solution Approach 2:
The control unit is designed with universal functionality to control multiple electric motors through the N half-bridges. This multi-functional design allows a single control unit to perform the work of multiple separate control units, significantly reducing system cost while maintaining independent motor control capability through intelligent signal management.
Data Source
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Figure 3~4
AI summary
The invention relates to a motor drive unit (1) configured for driving N-1 electric motors (2) of an electronic door latch arrangement (3) of a vehicle (4), comprising N ≥ 4 half-bridges (6) and the N-1 electric motors (2) with N being a natural number, wherein each half-bridge (6) comprises two switches (8, 10) arranged in series thereby forming a midpoint (11), each motor (2) is galvanically conductively connected to two different midpoints (11), and each midpoint (11) is galvanically conductively connected to ≥ 1 and ≤ N-2 electric motors (2). In this way an improved control of electric motors in a vehicle is provided.