Projector Drive Circuit Voltage Conversion and Isolation
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Solution Overview
Problem
Current projector drive circuits face challenges in enhancing power efficiency while reducing costs, particularly in laser projection technology, where conventional solutions like LLC converters result in poor energy efficiency and increased costs.
Innovation Solution
A projector drive circuit comprising a first voltage converter, light source driver, second voltage converter, control circuit, and isolation circuit, which converts and regulates voltages to efficiently power a light source, eliminating the need for an LLC converter and ensuring electrical isolation between the control and light source driver circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an LLC converter is used in the projector drive circuit, then voltage conversion is achieved, but energy efficiency deteriorates and cost increases
Solution Approach 1:
The patent extracts and removes the LLC converter from the drive circuit, replacing it with a simpler voltage conversion approach using a switching element and rectifier circuit. This extraction eliminates the energy efficiency problems and cost issues associated with LLC converters while maintaining the required voltage conversion functionality.
Solution Approach 2:
The patent employs simpler, more cost-effective components such as basic switching elements (MOSFETs or IGBTs) and rectifier circuits instead of expensive LLC converter components. This substitution reduces overall circuit cost and improves energy efficiency by eliminating the inefficiencies inherent in LLC converter architecture.
2Measurement precision
If voltage conversion components are added to improve light source control, then control precision improves, but device complexity increases
Solution Approach 1:
The patent introduces an isolation circuit as an intermediary between the control circuit and the light source driver. This isolation circuit includes a transformer that provides galvanic isolation while maintaining precise control signals. The intermediary approach enables accurate control without requiring the control circuit to directly interface with high-voltage components, thus maintaining control precision while managing complexity.
Solution Approach 2:
The patent segments the drive circuit into distinct functional modules: a control circuit for signal generation, an isolation circuit for voltage isolation and transformation, and a light source driver for power delivery. This segmentation allows each module to be optimized independently, achieving precise control through specialized components while keeping overall system complexity manageable through modular design.
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 configuration improves energy efficiency and reduces the cost of the projector drive circuit by operating effectively without an LLC converter, ensuring safe electrical isolation and efficient light source control.
Implementation Method 1
a first voltage converter configured to convert a first voltage into a second voltage
Implementation Method 2
a light source driver coupled to the first voltage converter to convert the second voltage into a third voltage
Implementation Method 3
a second voltage converter coupled to the first voltage converter to convert the second voltage into a fourth voltage
Implementation Method 4
an isolation circuit coupled to the control circuit and the light source driver to receive the first control signal and accordingly generate a second control signal to the light source driver, wherein, the isolation circuit is configured to electrically isolate the control circuit from the light source driver
Data Source
AI summary
A projector drive circuit includes a first voltage converter, a light source driver, a second voltage converter, and an isolation circuit. The first voltage converter converts a first voltage into a second voltage. The light source driver converts the second voltage into a third voltage. The second voltage converter converts the second voltage into a fourth voltage. The control circuit, coupled to the second voltage converter, receives the fourth voltage and outputs a first control signal. The isolation circuit, coupled to the control circuit and the light source driver, receives the first control signal and generates a second control signal to the light source driver, which controls the light source driver to generate the third voltage and provide the third voltage to a light source according to the second control signal. The isolation circuit electrically isolates the control circuit from the light source driver.