Light Emitting Element Drive Device Staggering Power Supply
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Solution Overview
Problem
When multiple light emitting element drive devices are turned ON or OFF simultaneously, they experience a large rush current, leading to noise generation and switch contact deterioration, and existing solutions complicate the configuration and maintenance of lighting systems by requiring time adjustments and separate control devices.
Innovation Solution
A light emitting element drive device that includes a power input line, an electric conduction switch, a voltage detection unit, a conversion processing unit, and a control unit that determines a delay time based on noise components in the power source voltage to stagger the power supply, reducing the rush current and simplifying system configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple light emitting element drive devices are turned ON simultaneously, then the lighting system responds quickly to power supply, but excessive rush current flows causing noise and switch contact deterioration
Solution Approach 1:
The control unit performs preliminary actions by detecting power supply voltage before turning ON the electric conduction switch. It determines a delay time based on the detected voltage and only activates the switch after this delay period, preventing rush current while maintaining quick response
Solution Approach 2:
The system dynamically adjusts the delay time based on the detected power supply voltage conditions. The control unit varies the delay period adaptively to match actual power supply characteristics, optimizing the balance between response speed and rush current prevention
2Object-affected harmful factors
If a delay circuit is provided at each power supply device to stagger power supply timing, then rush current is reduced, but the configuration becomes complicated and time setting for each device is required
Solution Approach 1:
Each light emitting element drive device autonomously determines its own delay time by detecting its local power supply voltage. The control unit automatically generates appropriate delay timing without external configuration or manual time setting, eliminating the need for complex centralized control
Solution Approach 2:
The system changes the timing parameter dynamically based on detected power supply voltage characteristics. By adjusting the delay time parameter according to actual voltage conditions, the system achieves rush current reduction without requiring fixed or complex configuration
3Object-affected harmful factors
If separate control devices are provided to generate driving signals for sequential lighting, then rush current is decreased, but the control system becomes complicated and maintenance becomes difficult
Solution Approach 1:
The control unit integrates multiple functions including power supply detection, delay time determination, and electric conduction switch control into a single integrated component. This consolidation eliminates the need for separate control devices while maintaining rush current reduction capabilities
Solution Approach 2:
The control unit serves multiple purposes: detecting power supply voltage, determining delay timing, controlling the electric conduction switch, and managing the light emitting elements. This multi-functionality simplifies the overall system configuration and maintenance
Data Source
AI summary
A light emitting element drive device includes an electric conduction switch that is provided along a power input line, a voltage detection unit that detects a power source voltage containing a noise component when the electric power is supplied to the power input line, a conversion processing unit that converts the detected power source voltage containing the noise component to a digital value, a data generation unit that generates data of a predetermined number of bits, and a control unit that turns on the electric conduction switch. The control unit determines a delay time based on the predetermined number of bits. The delay time corresponds to a time between supplying the electric power to the power input line and turning on the electric conduction switch. The control unit turns on the electric conduction switch after the delay time passes. Thus, an excessive rush current is prevented.