Three-Phase Power Supply Voltage Imbalance Correction
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Solution Overview
Problem
Conventional power supply devices experience voltage imbalance between three phases when a positive voltage is short-circuited earlier than others, leading to failure in detecting negative voltages and subsequent breakdown of semiconductor switches, preventing battery charging.
Innovation Solution
A power supply device with a rectification means for synchronously rectifying three-phase AC voltages, a switch control means to manage semiconductor switches based on battery charging status, a negative voltage detection means, and an abnormality detection means to monitor and correct voltage imbalances by controlling semiconductor switches until negative voltages can be detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor switches are continuously held conductive to maintain battery in charge-permit state, then battery charging continues, but voltage imbalance persists preventing negative voltage detection
Solution Approach 1:
The abnormality detection means continuously monitors voltage balance between three phases and provides feedback to the switch control means. When voltage imbalance is detected, the system adjusts switch conduction states to equalize voltages, ensuring accurate negative voltage detection while maintaining continuous battery charging. This closed-loop feedback mechanism resolves the contradiction between charging continuity and detection accuracy.
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
Prevents voltage imbalance-induced semiconductor switch breakdown, ensuring efficient battery charging by maintaining proper conductive states and synchronizing rectification across phases.
Implementation Method 1
a rectification means for synchronously rectifying three-phase AC voltages generated by a generator so as to produce a charging voltage for charging up a battery
Implementation Method 2
a negative voltage detection means for detecting a negative voltage at each of three phases of the three-phase AC voltages
Implementation Method 3
a voltage detection means for detecting the battery voltage being higher than a predetermined voltage
Data Source
AI summary
A power supply device capable of switching over semiconductor switches of a synchronous rectification means so as to efficiently charge up a battery in response to its charging status is provided. The device includes a switch control means for controlling the semiconductor switches in response to the battery charging status; a negative voltage detection means for detecting a negative voltage at each phase of three-phase AC voltages; and a voltage detection means for detecting the battery voltage being higher than a predetermined voltage, wherein when the negative voltage or the battery voltage higher than the predetermined voltage is detected, the switch control means controls the semiconductor switches. The device further includes an abnormality detection means for monitoring the negative voltage detected by the negative voltage detection means and thereby detecting an abnormality in at least one of the three phases, and when an abnormality is detected, the switch control means controls the semiconductor switch corresponding to the phase of the abnormality.