Auxiliary Current Source Circuit for FPGA Power Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In automatic driving systems, rapid changes in load current cause transient voltage variations in the power supply circuit, leading to increased data errors and automatic resets, which existing technologies struggle to adequately manage, especially when using FPGAs as reconfigurable logic circuits.
Innovation Solution
An electronic control device with a reconfiguration circuit, a main power supply circuit, and an auxiliary current source circuit, where the auxiliary current source circuit adjusts the current supplied to the reconfiguration circuit based on load variations, and a function control unit determines the operation mode to control the reconfiguration process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reconfiguration circuit rapidly switches between reconfiguration processing and algorithm processing, then the processing speed and adaptability are improved, but the transient voltage variation increases causing data errors and automatic resets
Solution Approach 1:
The auxiliary current source circuit performs preliminary action by detecting the load current variation before it causes significant voltage drop and proactively supplies compensation current. The control unit predicts the timing of load changes during reconfiguration switching and activates the auxiliary current source in advance to maintain stable output voltage.
Solution Approach 2:
The auxiliary current source circuit applies preliminary anti-action by generating compensation current that opposes the voltage drop caused by rapid load current changes. When the load current increases during reconfiguration processing, the auxiliary current source supplies additional current in the opposite direction to counteract the voltage variation.
2Reliability
If the output capacitor capacity is increased to smooth the output voltage during rapid load changes, then the voltage stability is improved, but the mounting area and cost increase
Solution Approach 1:
The auxiliary current source circuit acts as an intermediary between the main power supply and the reconfiguration circuit. Instead of relying solely on a large output capacitor, the auxiliary current source mediates the power delivery by providing compensation current during transient load changes, achieving voltage stability without requiring excessive capacitor capacity.
Solution Approach 2:
The invention changes the parameter of current supply by introducing an auxiliary current source that dynamically adjusts its output current based on load variations. This allows the system to maintain voltage stability through active current control rather than passive capacitance, reducing the required capacitor size and mounting area.
Data Source
AI summary
A transient increase or decrease of power supplied to a reconfiguration circuit to be a logic circuit whose circuit configuration can be changed is reduced. An autonomous traveling control ECU 201 has a reconfiguration circuit 209, a main power supply circuit 211, an auxiliary current source circuit 213, and a function control unit 207. The reconfiguration circuit 209 is a reconfigurable logic circuit. The main power supply circuit 211 supplies a power supply voltage to the reconfiguration circuit 209. The auxiliary current source circuit 213 increases or decreases a current supplied from the main power supply circuit 211 to the reconfiguration circuit 209. The function control unit 207 determines an operation mode of the reconfiguration circuit 209 on the basis of a mode determination signal input from the outside and indicating a traveling mode of a vehicle, and controls a reconfiguration of the reconfiguration circuit 209 on the basis of a determination result. The auxiliary current source circuit 213 increases or decreases the current supplied to the reconfiguration circuit 209 in accordance with a load variation of the reconfiguration circuit 209, on the basis of an auxiliary current control signal for giving an instruction on an increase or decrease of the current supplied to the reconfiguration circuit 209.