Dimming Device Current Limiter Inrush Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dimming devices are not compatible with a wide range of illumination loads and can experience flashing phenomena due to inrush currents, which can stress components and reduce compatibility.
Innovation Solution
A dimming device with a bidirectional switch, power supply, and current limiter that controls the bidirectional switch based on dimming levels and stops control electric power generation when a current exceeds a specified value, preventing inrush currents and ensuring compatibility with various loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply generates control electric power continuously from the AC power supply, then the controller can operate without interruption, but inrush currents occur causing flashing phenomena and component stress
Solution Approach 1:
The current limiter performs preliminary action by detecting and limiting inrush currents before they can cause harmful effects. The limiter is pre-configured with threshold values that automatically trigger current suppression when exceeded, preventing flashing phenomena and component stress before they occur.
Solution Approach 2:
The current limiter acts as an intermediary component between the AC power supply and the power supply circuit. It mediates the power flow by monitoring current levels and inserting resistance or blocking paths when inrush conditions are detected, thereby protecting the controller while maintaining normal operation.
2Device complexity
If the dimming device uses a simple power supply circuit without current limiting, then the device complexity is reduced, but compatibility with various illumination loads decreases due to inrush current issues
Solution Approach 1:
The current limiter is designed with universal applicability to work with various illumination load types without requiring circuit redesign. It provides multi-functional protection against inrush currents while maintaining compatibility with different load characteristics, making the dimming device versatile across applications.
Solution Approach 2:
The current limiter dynamically adjusts its parameters (resistance values, threshold levels) based on the detected current conditions and load characteristics. This allows the circuit to adapt to different illumination loads while maintaining simple overall structure, resolving the contradiction between complexity and versatility.
3Use of energy by moving object
If the power supply continuously draws power from the AC supply, then the controller has sufficient power for operation, but stress on the power supply components increases
Solution Approach 1:
The current limiter applies preliminary anti-action by opposing and limiting excessive current draw before it can cause component stress. It pre-establishes protection mechanisms that counteract inrush currents and sustained high current conditions, thereby reducing stress on power supply components while ensuring adequate controller power supply.
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
The solution prevents flashing and reduces stress on components, enabling compatibility with a broader range of illumination loads and maintaining stable operation.
Implementation Method 1
The current limiter is configured to stop generation of the control electric power by the power supply when a current larger than or equal to a specified value flows from the AC power supply to the power supply
Implementation Method 2
The power supply is electrically connected between the pair of input terminals and is configured to be supplied with electric power from the AC power supply to generate control electric power
Implementation Method 3
The bidirectional switch is configured to switch between non-conduction and conduction of a bidirectional current between the pair of input terminals
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A dimming device is provided which is compatible with an increased number of types of illumination loads. The dimming device includes a pair of input terminals, a bidirectional switch, an inputter, a power supply (5), a controller, and a current limiter (53). The power supply (5) is electrically connected between the pair of input terminals and is supplied with electric power from an AC power supply to generate control electric power. The controller is supplied with the control electric power from the power supply (5) to operate. The controller is configured to control the bidirectional switch in accordance with a dimming level. The current limiter (53) stops generation of the control electric power by the power supply (5) when a current larger than or equal to a specified value flows from the AC power supply through the power supply (5).