LED Driver Switching Thermistor and Discharge Resistor for Power Efficiency
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Solution Overview
Problem
Existing light source driving systems for LEDs face challenges in achieving high power efficiency and minimizing standby power consumption due to the unnecessary operation of thermistors and discharge resistors in normal states, leading to inefficient power usage.
Innovation Solution
A light source driving apparatus with a switch that selectively connects the thermistor and discharge resistor to the external power source only during initial driving and power cut-off, using a relay switch controlled by a switch controller to block connections in the normal state, thereby preventing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermistors and discharge resistors are continuously connected to the power source, then they can always be ready for operation, but unnecessary power consumption occurs in normal states
Solution Approach 1:
The patent applies the dynamics principle by making the connection state of thermistors and discharge resistors changeable rather than fixed. A switch controller dynamically controls the switching element to connect these components only when needed (during startup or power cut-off conditions) and disconnect them during normal operation, thus eliminating continuous power consumption while maintaining operational readiness when required.
2Use of energy by moving object
If a switch is added to control the connection of thermistors and discharge resistors, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent applies the universality principle by designing the switching element and switch controller to perform multiple functions: controlling the connection of thermistors, managing discharge resistor operation, and responding to different power supply conditions (normal operation, startup, and power cut-off). This multi-functional design reduces the need for separate control mechanisms for each component, thereby limiting the increase in device complexity while achieving power consumption reduction.
3Reliability
If thermistors are always connected, then inrush current protection is always available, but power efficiency decreases during normal operation
Solution Approach 1:
The patent applies the preliminary action principle by providing inrush current protection only when necessary - during startup conditions when the power supply is first connected. The switch controller detects the power supply state and activates the thermistor connection only during startup or power cut-off conditions, then disconnects it during normal operation. This ensures protection is available when needed while avoiding continuous energy loss during normal 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
The solution achieves high power efficiency and stable operation by minimizing power consumption during normal states and preventing inrush currents, resulting in a simplified circuit operation with improved power factor correction and reduced standby power.
Implementation Method 1
a thermistor with an end connected to the first external input terminal
Implementation Method 2
a discharge resistor with an end connected to the second external input terminal
Implementation Method 3
the EMI filterer may include a capacitor connected between the first external input terminal and the second external input terminal
Data Source
AI summary
Provided are a light source driving apparatus, a light source device including the same, and a light source driving method. The light source driving apparatus includes: a first external input terminal and a second external input terminal; a thermistor with an end connected to the first external input terminal; a discharge resistor with an end connected to the second external input terminal; and a switch which selectively connects, according to a control signal, another end of the discharge resistor to another end of the thermistor or the first external input terminal to the other end of the thermistor.