LED Illumination Device Residual Capacitance Discharge Circuit
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Solution Overview
Problem
LED illumination devices often continue to produce a weak light source due to residual capacitance after power is turned off, as the remaining capacitance supplies power to the LED chips.
Innovation Solution
An LED illumination device design that includes a bridge rectifier chip, current-limiting chip, light-emitting group, resistor group, and capacitor, where the light-emitting group and resistor group are arranged in parallel, with different working voltages and resistance values for the LED and resistor chips, allowing the residual capacitance to be rapidly released by the resistor chips when power is stopped, ensuring all LED chips turn off within 2 seconds without generating a light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor is used to store power for LED chips, then the LED illumination device can maintain operation during power fluctuations, but residual capacitance causes weak light emission after power is turned off
Solution Approach 1:
The patent extracts the harmful residual capacitance effect by introducing a dedicated discharge circuit with resistor chips that actively removes stored energy from the capacitor after power is turned off, separating the power storage function from the harmful residual effect
Solution Approach 2:
The patent converts the harmful residual capacitance into a beneficial feature by using the stored energy to power the discharge circuit, which then safely dissipates the energy through resistor chips, transforming the problem into a controlled solution
2Object-generated harmful factors
If the power is turned off completely, then the harmful residual light emission is eliminated, but the capacitor cannot supply power to LED chips when needed
Solution Approach 1:
The patent implements dynamic control of the discharge circuit by using a control chip that activates the discharge path only after power is turned off, allowing the system to adapt its behavior based on the power state - maintaining power during operation and enabling discharge during shutdown
Solution Approach 2:
The patent prepares the discharge circuit in advance by pre-configuring the resistor chips and control logic, so that when power is turned off, the discharge path is immediately activated to handle residual capacitance without delay
3Loss of time
If resistor chips are added to discharge residual capacitance, then the LED chips can be turned off quickly, but the device complexity increases
Solution Approach 1:
The patent merges the discharge function with the existing power supply circuit by integrating resistor chips into the same circuit board and using the control chip to manage both power distribution and discharge operations, reducing overall system complexity
Solution Approach 2:
The control chip performs multiple functions - managing power distribution to LED chips during operation and activating the discharge circuit during shutdown - eliminating the need for separate dedicated control components
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 device effectively and quickly shuts down all LED chips by releasing residual capacitance through the cooperation of resistor chips, preventing any light emission within a predetermined time, such as 2 seconds, thus addressing the issue of residual power supply to LED chips.
Implementation Method 1
the residual capacitance remaining in the capacitor is released by cooperation of the first resistor chips and the second resistor chips
Implementation Method 2
the residual capacitance remaining in the capacitor is released by cooperation of the first resistor chips and the second resistor chips, so that all of the first LED chips and the second LED chips are completely turned off within 2 seconds
Data Source
AI summary
An LED illumination device for rapidly releasing residual capacitance, which includes a bridge rectifier chip, a current-limiting chip, a light-emitting group, a resistor group and a capacitor. The light-emitting group includes a plurality of first and second LED chips. The resistor group includes a plurality of first and second resistor chips. The first working voltage of the first LED chip is different from the second working voltage of the second LED chip. The first resistance value of the first resistor chip is different from the second resistance value of the second resistor chip. Each first LED chip corresponds to one of the first resistor chips, and each second LED chip corresponds to one of the second resistor chips. When the power supply is turned off, the residual capacitance remaining in the capacitor can be released by cooperation of the first resistor chips and the second resistor chips.