LED Backlight Boost Circuit Omitting Regulator
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Solution Overview
Problem
Conventional boost circuits for LED backlight drivers require a regulator to prevent switches from withstanding high voltages, leading to high power consumption and increased costs, especially with linear regulators, and higher expenses with switching regulators.
Innovation Solution
A boost circuit for LED backlight drivers that omits the regulator by using a PWM chip to generate a PWM signal, filtering out the direct current component with a capacitor, and modifying the signal with a signal processing circuit to directly control the switch, reducing the need for a regulator and associated costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regulator is disposed in the conventional boost circuit to supply driving voltage to the switch and VCC to the PWM chip, then the switch is protected from high voltage, but power consumption increases and cooling area is required
Solution Approach 1:
The patent extracts and removes the regulator component from the boost circuit. Instead of using a traditional regulator to supply driving voltage to the switch and VCC to the PWM chip, the invention directly utilizes the PWM chip's internal voltage generation capabilities and the switch's inherent voltage withstanding properties, thereby eliminating the regulator and its associated power consumption and cooling requirements
Solution Approach 2:
The PWM chip is designed to self-generate the necessary driving voltages without requiring an external regulator. The switch Q1 is selected to inherently withstand the maximum output voltage, eliminating the need for additional voltage regulation components. This self-service approach reduces power consumption and removes cooling area requirements
2Reliability
If a linear regulator is used to supply driving voltage to the switch, then the switch is protected from high voltage, but power consumption is high and cooling area is required
Solution Approach 1:
The patent removes the linear regulator from the circuit configuration. By selecting a switch Q1 with adequate voltage rating (withstanding maximum output voltage) and utilizing the PWM chip's internal voltage generation, the regulator is completely extracted from the system, eliminating the need for cooling area
Solution Approach 2:
The invention replaces the expensive and complex linear regulator with simpler, more economical components - specifically, a PWM chip with integrated voltage generation and a switch selected for appropriate voltage rating. This substitution reduces both device complexity and cooling requirements
3Loss of energy
If a switching regulator is used to supply driving voltage to the switch, then power conversion efficiency is improved, but cost increases
Solution Approach 1:
The PWM chip is designed to perform multiple functions simultaneously: generating PWM signals for switch control and generating the necessary VCC voltage internally. This multi-functionality eliminates the need for a separate regulator component, reducing overall system cost while maintaining efficient power conversion through optimized internal circuitry
Solution Approach 2:
The patent merges the voltage generation function and PWM control function into a single integrated PWM chip. By combining these functions, the design eliminates the need for a separate regulator component, thereby reducing system cost while maintaining efficient power conversion through integrated circuit optimization
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
This solution reduces costs by eliminating the need for a regulator, while maintaining efficient power conversion and protecting the switch from high voltages, thus offering a cost-effective alternative to conventional boost circuits.
Implementation Method 1
One end of the second capacitor is coupled to an output pin of the PWM chip, and the second capacitor is utilized to filter out a direct current component of the PWM signal
Data Source
AI summary
A boost circuit for an LED (Light Emitting Diode) backlight driver circuit is disclosed; said boost circuit includes a PWM (Pulse Width Modulation) chip, a second capacitor, and a signal processing circuit. A VCC pin of the PWM chip is coupled to the input node, and the PWM chip is utilized to generate a PWM signal. One end of the second capacitor is coupled to an output pin of the PWM chip, and the second capacitor is utilized to filter out a direct current component of the PWM signal. One terminal of the signal processing circuit is coupled to the second capacitor, and another terminal thereof is coupled to a gate of the switch. The signal processing circuit is used to adjust the filtered PWM signal for generating corresponding high levels and low levels. A regulator is omitted in the present invention, therefore reducing costs.