Dual-Input Load Driver Current Distribution for PCB Heat Limits
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Solution Overview
Problem
Conventional load drive devices experience increased power consumption and heat generation with rising input voltage, necessitating a large print-circuit board area, making them difficult to install in compact modules.
Innovation Solution
A load drive device with a current distributor that sums input currents at a prescribed distribution ratio, controlled by a controller to manage power consumption, using external resistors to distribute power consumption and reduce internal heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the input voltage Vin rises, then the power consumption Pc increases, but the heat generation becomes large requiring a large print-circuit board area
Solution Approach 1:
The invention divides the single input current path into two separate input current paths (first input current Iin1 and second input current Iin2). The current distributor sums these two input currents at a prescribed distribution ratio to generate the output current. This segmentation allows power consumption to be distributed across multiple paths, reducing the heat generation burden on any single path and enabling compact module installation without requiring a large print-circuit board area.
2Reliability
If output feedback control is used to keep output current constant, then output current stability is improved, but power consumption increases with input voltage
Solution Approach 1:
The controller dynamically adjusts the distribution ratio between the two input current paths based on operating conditions. By differentially controlling the on-resistance values of the transistors in each path, the system can optimize the balance between maintaining constant output current and managing power consumption, adapting to varying input voltages and load conditions.
3Temperature
If a large print-circuit board area is used for heat dissipation, then heat dissipation capability is improved, but device compactness deteriorates
Solution Approach 1:
The invention segments the power consumption across two input current paths with distributed resistance elements. This segmentation reduces the concentration of heat generation in any single location, improving heat dissipation efficiency within a smaller area. Consequently, the module can be installed in a compact form without requiring a large print-circuit board for heat dissipation.
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 maintains power consumption within a prescribed limit, reducing heat generation and allowing for compact module installation, while accommodating unstable input voltages and enhancing reliability and product life.
Implementation Method 1
a current distributor configured to generate the output current by summing the first input current and the second input current at a prescribed distribution ratio
Implementation Method 2
the controller is configured to control an on-resistance value of the first transistor
Implementation Method 3
the controller is configured to differentially control on-resistance values of the first transistor and the second transistor
Data Source
AI summary
A semiconductor device includes: a first input terminal configured to be connected to an external voltage; a second input terminal configured to be connected to the external voltage via an external discrete element; a first output terminal configured to be connected to an input node of a first external light emitting element; a second output terminal configured to be connected to an input node of a second external light emitting element; a current driver configured to provide a current to the first output terminal and the second output terminal, and a current distributor configured to control a ratio between a first current flowing from the first input terminal to the current driver and a second current flowing from the second input terminal to the current driver.