Semiconductor Light Source Driving Apparatus with Overvoltage Detection
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Solution Overview
Problem
Existing semiconductor light source driving apparatuses fail to continuously drive series-connected light source elements without disconnection failures and effectively inform users of such failures, leading to incomplete lighting operations.
Innovation Solution
A semiconductor light source driving apparatus with a light source unit comprising series-connected modules, each including a switching element, series-connected light source elements, an overvoltage detection circuit with a zener diode and LED, and a light detecting element, which detects disconnection failures and controls the switching element to short-circuit faulty modules, allowing continuous operation of unaffected elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If series-connected light source elements are used to reduce power consumption and increase reliability, then energy efficiency improves, but the system stops completely when one element disconnects
Solution Approach 1:
The light source system is divided into multiple independent modules, each with its own switching element. When a disconnection is detected in one module, only that specific module is short-circuited while other modules continue to operate, enabling segmented failure isolation and continuous partial operation.
Solution Approach 2:
Overvoltage detection circuits with zener diodes are pre-installed in parallel with each light source module to detect disconnections before they cause complete system failure. The detection circuit triggers a switching element to short-circuit the faulty module, cushioning the impact and preventing total system shutdown.
2Reliability
If detection circuits are added to detect disconnection failures, then reliability monitoring improves, but device complexity increases
Solution Approach 1:
The overvoltage detection circuit serves multiple functions: it detects disconnections in light source elements, protects against voltage spikes, and triggers the switching element to isolate faulty modules. This multi-functionality reduces the need for separate dedicated detection circuits, thereby limiting complexity increase.
Solution Approach 2:
The detection circuit uses the existing overvoltage protection infrastructure (zener diodes) to perform disconnection detection. The zener diode's breakdown characteristic naturally indicates voltage changes caused by disconnections, eliminating the need for additional active sensing components and reducing overall circuit complexity.
3Reliability
If switching elements are added to short-circuit faulty modules, then continuous operation of healthy elements is enabled, but device complexity and power consumption increase
Solution Approach 1:
The switching element is merged with the existing parallel circuit structure of each light source module. The switching element is positioned in parallel with the light source elements, allowing it to short-circuit faulty modules without requiring separate control circuits or additional complex switching mechanisms.
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 continuous lighting of semiconductor light source elements without disconnection failures and reduces power consumption and detection time, minimizing light emission suspension periods.
Implementation Method 1
an overvoltage detection circuit in which a zener diode and a light emitting element are connected in series
Implementation Method 2
a light emitting element are connected in series and a light detecting element is disposed to face the light emitting element
Implementation Method 3
a light detecting element is disposed to face the light emitting element, the switching element, the light source elements, and the overvoltage detection circuit being connected in parallel to each other
Data Source
AI summary
A semiconductor light source driving apparatus includes a light source unit which has a plurality of series-connected light source modules. Each light source module includes: a switching element which is controlled to turn on/off by a control signal; series-connected light source elements; and an overvoltage detection circuit in which a zener diode and a light emitting element are connected in series and a light detecting element is disposed to face the light emitting element, the switching element, the light source elements, and the overvoltage detection circuit being connected in parallel to each other. The semiconductor light source driving apparatus further includes: a DC (Direct Current) power supply which supplies a DC voltage to the light source unit; a switching element driving unit which drives the switching element of each of the light source modules to turn on/off the switching element; and a controller which controls the switching element driving unit so that the switching element is turned on according to detection of light by the light detecting element.