Load Drive Current Distribution for Heat and Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional load drive devices experience increased power consumption and heat generation as input voltage rises, making it difficult to install them in compact modules due to the need for a large printed circuit board for heat dissipation.
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 transistors and differential amplifiers to adjust resistance values and distribute power effectively, thereby reducing internal power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the input voltage Vin rises, then the output capability is improved, but the power consumption Pc increases and heat generation becomes large
Solution Approach 1:
The input current path is segmented into two separate paths: a first input terminal accepting current directly from the power source, and a second input terminal accepting current through an external resistor. The current distributor selectively sums these currents at different distribution ratios to manage power consumption while maintaining output capability.
Solution Approach 2:
The controller dynamically changes the distribution ratio parameter of the current distributor based on the input voltage level. When input voltage rises, the distribution ratio is adjusted to limit the current from the first input terminal, thereby controlling power consumption while maintaining sufficient output capability.
2Power
If the power consumption Pc increases, then the output current capability is improved, but the heat generation becomes large requiring large area for heat dissipation
Solution Approach 1:
The device segments the power consumption management by separating the current input paths and using a current distributor to control the proportion of current from each path. This allows independent control of power consumption and output current capability, enabling high output current with controlled heat generation.
Solution Approach 2:
The controller monitors the power consumption and heat generation conditions, then provides feedback to adjust the distribution ratio of the current distributor. This closed-loop control ensures that output current capability is maintained while heat generation stays within acceptable limits for compact module installation.
3Device complexity
If the distribution ratio is fixed, then the device complexity is reduced, but the adaptability to different input voltages and power consumption requirements is limited
Solution Approach 1:
The distribution ratio is made dynamic rather than fixed. The controller continuously adjusts the distribution ratio based on real-time monitoring of input voltage and power consumption conditions, enabling the device to adapt to varying input voltages and power requirements without excessive complexity.
Solution Approach 2:
The control system changes the distribution ratio parameter in response to different operating conditions. This parameter adjustment mechanism provides high adaptability to various input voltages and power consumption requirements while maintaining a relatively simple overall device structure through standardized control circuitry.
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 allows for constant power consumption and reduced heat generation, enabling the load drive device to be installed in compact modules without excessive heat dissipation requirements, and accommodates unstable input voltages, enhancing reliability and product life.
Implementation Method 1
the controller is configured to control an on-resistance value of the first transistor
Implementation Method 2
the controller is configured to differentially control on-resistance values of the first transistor and the second transistor
Implementation Method 3
a differential amplifier configured to generate a control signal for the current distributor according to a difference value between the first differential input voltage and the second differential input voltage
Data Source
AI summary
Provided is a load drive device comprising: a first input terminal for accepting an input of a first input current from a power source; a second input terminal for accepting an input of a second input current from the power source via an external resistor; an output terminal for outputting an output current to a load; a current distribution unit for summing the first input current and second input current at a prescribed distribution ratio and generating the output current and a control unit for controlling the distribution ratio. As one example, it would be appropriate for the control unit to control the distribution ratio according to the difference between a first terminal voltage present in the second input terminal and a second terminal voltage present in the output terminal.