Power Supply IC Voltage Adjustment via External Resistor
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Solution Overview
Problem
The existing methods for providing power supply voltages to microcomputers require redesign of the power supply circuit and IC, leading to increased development costs and complexity due to the need for multiple power supply IC types and the use of EEPROMs, which adds cost and management complexity.
Innovation Solution
An electronic control device with a power supply circuit that uses a discrete resistor connected to a power supply IC, allowing for adjustable output voltage by selecting the resistance value, thereby enabling a single power supply IC to be adapted to various microcomputers without the need for multiple IC types or additional EEPROMs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power supply IC with EEPROM is used to adjust output voltage, then the output voltage can be varied, but the cost of the power supply IC increases
Solution Approach 1:
The invention extracts the voltage adjustment function from the power supply IC by using an external resistor instead of an internal EEPROM. The resistor is connected to the power supply IC's voltage adjustment terminal, allowing output voltage to be varied by simply changing the external resistor value, thereby reducing the power supply IC cost while maintaining voltage variability.
Solution Approach 2:
The power supply IC is designed with a universal voltage adjustment terminal that can accept different external resistor values to accommodate various output voltage requirements. This universal interface allows a single power supply IC model to serve multiple applications with different voltage needs, eliminating the need for costly EEPROM-based programmable solutions.
2Adaptability or versatility
If multiple types of power supply ICs are used for different power supply voltages, then the required power supply voltages can be provided, but the management cost increases
Solution Approach 1:
The power supply IC incorporates a universal voltage adjustment mechanism that accepts external resistors to set different output voltages. This allows a single power supply IC type to provide multiple different power supply voltages by simply changing the external resistor, thereby reducing the number of IC types needed and simplifying management.
Solution Approach 2:
The output voltage of the power supply IC is made variable by changing the external resistor parameter. This parameter-based adjustment approach enables a single IC design to cover multiple voltage requirements, eliminating the need for multiple specialized IC types and reducing management complexity.
3Adaptability or versatility
If an EEPROM is installed outside the power supply IC to adjust voltage, then the voltage can be adjusted, but the cost increases due to addition of component
Solution Approach 1:
The invention removes the EEPROM component from the system and replaces it with a simpler external resistor. The resistor provides the same voltage adjustment capability without the complexity and cost of an EEPROM, thereby reducing the total component count while maintaining voltage adaptability.
Solution Approach 2:
The invention replaces the expensive and complex EEPROM with a cheap, simple resistor. The resistor is a basic, low-cost component that provides the necessary voltage adjustment function without the overhead of programmable memory, reducing both component cost and system complexity.
Data Source
AI summary
An inexpensive electronic control device is implemented that enables a power supply voltage supplied to a microcomputer to be varied using a simple method and that enables an identical power supply to be adapted to various microcomputers. A switch is turned on to determine the value of a discrete resistor, and a voltage based on the value of current from a current source and the resistance value of the discrete resistor is caused in an In1 terminal. By an A/D converter, the In1 terminal voltage is subjected to A/D conversion, and a digital code corresponding to the selectively connected discrete resistor is detected. The result of the A/D conversion is saved in a register, and the determination of the resistance value of the discrete resistor performed by the A/D converter is completed. After the completion of the resistance value determination performed by the A/D converter, power supply voltages start activation. The core voltage activates to secure a voltage corresponding to a reference voltage set by the register and thereby a desired power supply is completed.