Three-Phase AC Dynamo Battery Charging Phase Detection
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Solution Overview
Problem
Existing battery charging apparatuses for vehicles face challenges in correctly specifying the phases of three-phase AC outputs, leading to incorrect connections between the dynamo and rectifying circuit, which can result in suboptimal battery charging and increased costs due to terminal coloring for distinction.
Innovation Solution
A battery charging apparatus with a rectifying circuit and switching element control means that uses potential difference detection and pulse generation to determine the phase order of three-phase AC outputs, allowing for appropriate voltage control and eliminating the need for terminal coloring by specifying the phases based on detected patterns and relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If terminal coloring is used to distinguish terminals, then connection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces the mechanical/visual identification method (terminal coloring) with an electrical detection method. The control circuit detects potential differences between terminals to automatically identify phase connections, eliminating the need for colored markings while maintaining connection accuracy.
Solution Approach 2:
The system performs self-identification of terminal phases through automatic potential difference detection. The control circuit autonomously determines the correct phase connections by measuring electrical potentials, without requiring external visual aids or manual identification procedures.
2Ease of operation
If switching elements are added to control dynamo output, then battery charging control is improved, but device complexity increases
Solution Approach 1:
The control circuit serves multiple functions: it detects phase connections through potential difference measurement, identifies terminal phases, controls switching element operation, and regulates battery charging. By integrating these functions into a single control system, the patent manages complexity while achieving comprehensive control capability.
Solution Approach 2:
The patent combines the detection function (potential difference measurement) and control function (switching element operation) into a unified control circuit. This integration reduces the number of separate components and simplifies the overall system architecture while maintaining full control functionality.
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 accurate specification of phases, ensuring appropriate voltage control for battery charging, simplifying the attachment and detachment processes during manufacturing and maintenance, and reducing costs by eliminating the need for terminal coloring.
Implementation Method 1
pulse generation means for generating a pulse signal by detecting passage of a reluctor arranged on a rotor of the three-phase AC generator
Data Source
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AI summary
A battery charging apparatus is connected between a three-phase AC dynamo (11) and battery (15), and has input terminals respectively connected to output terminals (U, V, and W) of respective phases of the three-phase AC dynamo (11), a rectifying circuit (14) including a plurality of rectifying elements and a plurality of switching elements, a control circuit (16) which controls turn-on/off of the respective switching elements, and a pulse signal generator (18) which generates a pulse signal (Tp) by detecting passage of a reluctor (17) arranged on a rotor of the three-phase AC dynamo (11) Line voltage sensors (162, 163) detect potential differences between potentials of two input terminals of the plurality of input terminals and the ground potential of the battery (15). An inverter controller (161) controls the plurality of switching elements, determines a phase order of three-phase AC outputs input to the input terminals based on a pattern of the potential differences detected by the line voltage sensors (162, 163), and specifies phases of the three-phase AC outputs input to the input terminals based on the relationship among the phase order, a generation timing of the pulse signal (Tp), and the potential differences of the plurality of input terminals.