Priority Control Circuit for Vehicle Lamps Using Analog Switching
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Solution Overview
Problem
The existing priority control methods for vehicle lamps, which often rely on microprocessors, incur high costs due to the need for additional components like regulators and pull-down resistors, and require complex software programs, while also being inflexible in managing different priorities for turn signal, daytime running, and tail lamps according to legal specifications.
Innovation Solution
A priority control circuit utilizing an analog circuit with specific configurations of switching elements, including PNP and NPN transistors, to manage the operation of vehicle lamps without the need for a microprocessor, reducing material and fabrication costs, and allowing for independent control of lamp priorities through circuit configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a micro-control unit (MCU) is used for priority control of vehicle lamps, then lamp operation control capability is improved, but cost increases due to additional components like regulators and pull-down resistors
Solution Approach 1:
The patent extracts the priority control function from the MCU and implements it using a dedicated analog circuit with switching elements. This separates the priority control logic from the general-purpose processor, eliminating the need for MCU and its associated support components while maintaining lamp control capability.
Solution Approach 2:
The patent replaces the software-based priority control mechanism in the MCU with an analog electronic circuit using switching elements. This substitution eliminates the need for software programs and reduces hardware complexity by removing the MCU, regulators, and pull-down resistors.
2Ease of operation
If a micro-control unit (MCU) is used for priority control of vehicle lamps, then lamp operation control capability is improved, but software program complexity increases
Solution Approach 1:
The patent replaces the software-based priority control mechanism with an analog electronic circuit using switching elements. This substitution eliminates the need for software programs entirely, as the priority control logic is implemented through the electrical characteristics and switching behavior of the analog components.
Solution Approach 2:
The analog circuit with switching elements automatically determines lamp priorities based on signal presence and circuit configuration, without requiring software processing. The circuit self-regulates the control signals to the driver based on the input signals from lamp control units.
3Adaptability or versatility
If multiple lamps are driven by a single driver, then device integration is improved, but control signal management complexity increases
Solution Approach 1:
The patent introduces an intermediate analog priority control circuit between the lamp control units and the single driver. This intermediary circuit receives control signals from multiple lamp control units, processes them according to priority rules, and generates appropriate control signals for the driver, thereby simplifying signal management.
Solution Approach 2:
The patent extracts the priority control logic from the driver and MCU, implementing it in a separate analog circuit. This allows the driver to focus solely on driving the lamps while the priority control handles signal management, reducing overall system complexity.
Data Source
AI summary
A priority control circuit for the operation of vehicle lamps. The priority control circuit includes a first circuit and a second circuit. The first circuit includes a first PNP transistor, a first NPN transistor having a gate connected to a collector of the first PNP transistor, and a first output port connected to a collector of the first NPN transistor. When a first lamp turn-on signal for turning on a first lamp is input, the first circuit turns on a second lamp and a third lamp. The second circuit includes a second NPN transistor, a second PNP transistor having a gate connected to a collector of the second NPN transistor, and a second output port connected to a collector of the second PNP transistor. The second circuit controls priorities for the operation of the second lamp and the third lamp.