Power Supply Device Voltage Shaping via Discharge Switch
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Solution Overview
Problem
Conventional power supply devices with dimmers control the main switch during periods of no input voltage, leading to inefficient power management and voltage shaping.
Innovation Solution
A power supply device with a filter capacitor and discharge switch that controls input voltage shaping using a predetermined pattern, managing the conduction period and current flow based on the phase angle of the input voltage, and includes a conduction period controller and duty determiner to optimize switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main switch is controlled to perform switching operation during the period when no input voltage is generated, then the power supply device can maintain continuous operation, but power transmission efficiency deteriorates and voltage shaping precision is compromised
Solution Approach 1:
The control period is segmented into two distinct phases: a first period during conduction when the main switch performs normal switching operations, and a second period during non-conduction when the discharge switch is activated to discharge the filter capacitor. This segmentation allows the system to maintain continuous operation while avoiding inefficient switching during voltage absence, thereby resolving the contradiction between reliability and energy efficiency.
Solution Approach 2:
The patent implements periodic action by alternating between two operational modes: during the conduction period, the main switch operates normally; during the non-conduction period, the discharge switch operates to discharge the capacitor. This periodic alternation ensures continuous power supply while optimizing energy efficiency by preventing unnecessary switching operations during voltage absence.
2Manufacturing precision
If the discharge switch is used to shape the input voltage with a predetermined pattern, then voltage shaping precision is improved, but device complexity increases
Solution Approach 1:
The discharge switch serves multiple functions: it discharges the filter capacitor during the non-conduction period, shapes the input voltage with a predetermined pattern to improve voltage quality, and enables the system to handle both conduction and non-conduction periods efficiently. By making the discharge switch multi-functional, the patent achieves improved voltage shaping precision without proportionally increasing device complexity.
3Productivity
If the current flowing to the discharge switch is increased during the second period, then voltage shaping efficiency is improved, but the stress on the discharge switch increases
Solution Approach 1:
The discharge switch is activated in advance during the non-conduction period before the next voltage cycle begins. By discharging the filter capacitor during this preparatory phase, the system ensures that the capacitor is ready for the next conduction period, improving voltage shaping efficiency while distributing the stress over time rather than concentrating it during peak operation.
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
Enables precise control of input voltage and current flow, improving power transmission efficiency and voltage shaping during both conduction and non-conduction periods of the dimmer.
Implementation Method 1
a filter capacitor coupled to a line to which an input voltage that is passed through a dimmer is supplied
Implementation Method 2
the filter capacitor is discharged by a current flowing to the discharge switch during the first period
Data Source
AI summary
A power supply device according to the present invention includes: a filter capacitor coupled to a line to which an input voltage that is passed through a dimmer is supplied; a discharge switch coupled to the filter capacitor through the line; and a main switch receiving the input voltage and controlling power transmission. The power supply device performs input voltage control for shaping the input voltage with a predetermined pattern using the discharge switch.