Discharge Control Circuit for Interphase and Main Capacitors
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Solution Overview
Problem
Existing power supply apparatuses face challenges in effectively discharging both the interphase capacitor and the main capacitor when power failure occurs, necessitating a practical discharge technique for safety considerations.
Innovation Solution
A power supply semiconductor device with switching elements and a control circuit that performs first and second discharge operations to safely discharge the interphase and main capacitors, respectively, using a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a discharge technique for both interphase capacitor and main capacitor is implemented, then safety is improved, but device complexity increases
Solution Approach 1:
The patent combines the discharge control for both the interphase capacitor and main capacitor into a single integrated control circuit. The control circuit uses two switching elements (first switching element connected to interphase capacitor, second switching element connected to main capacitor) that are managed by the same control logic, which detects power failure conditions and coordinates the discharge of both capacitors through unified control signals, thereby improving safety without proportionally increasing device complexity.
Solution Approach 2:
The control circuit is designed with multi-functionality to handle both discharge operations. It detects power failure conditions and simultaneously controls two different discharge paths (one for interphase capacitor, one for main capacitor) using a single control unit, making the system more versatile while avoiding the need for separate independent control mechanisms for each capacitor.
2Device complexity
If a simple discharge configuration is used, then device complexity is reduced, but discharge effectiveness may be compromised
Solution Approach 1:
The patent segments the discharge function into two distinct discharge paths with dedicated switching elements. The first switching element handles interphase capacitor discharge through a first discharge path, while the second switching element handles main capacitor discharge through a second discharge path. This segmentation allows each path to be independently controlled and optimized, ensuring effective discharge of both capacitors while maintaining a relatively simple overall configuration.
Solution Approach 2:
The control circuit is designed to detect power failure conditions in advance and initiate discharge operations before the capacitors can pose safety risks. The control circuit monitors the input voltage and, upon detecting power failure, immediately activates the appropriate switching elements to begin discharge procedures, ensuring effective discharge while maintaining simple circuitry without requiring complex real-time adjustment mechanisms.
Data Source
AI summary
A full-rectified voltage of an alternating-current is generated on a target wiring, and another rectification voltage is fed to a first input terminal. A second input terminal is connected to the target wiring. A main capacitor is provided between a potential control terminal and the target wiring. A first switching element is provided between the potential control terminal and the ground. In the supply period of the alternating-current voltage, the first switching element is turned on and off based on the voltages at the first input terminal and the potential control terminal. When power failure is sensed, an interphase capacitor is discharged via the first input terminal and a second switching element and then the main capacitor is discharged via the first and second switching elements.