Switching Converter Control for Noise Reduction and Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switching converters face challenges in achieving both noise reduction and supply voltage stability when the switching frequency is spread to reduce noise, as this often leads to instability in the supply voltage.
Innovation Solution
A controller is employed to monitor the time variation of the supply voltage and control the rise and fall times or switching frequency based on this variation, using a gate resistor circuit to adjust the gate resistance and slew rate, thereby reducing noise and maintaining voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the switching frequency is spread to reduce noise, then noise is reduced, but supply voltage stability deteriorates
Solution Approach 1:
The patent applies dynamics by making the gate resistance value variable rather than fixed. The gate resistance is dynamically adjusted based on the operating conditions of the switching converter, allowing the system to optimize both noise reduction and voltage stability across different operating points. This is achieved through a control unit that modifies the gate resistance in real-time according to the switching frequency and load conditions.
Solution Approach 2:
The patent changes the parameter of gate resistance to resolve the contradiction. By adjusting the gate resistance value, the system can control the slew rate of the switching voltage, thereby influencing both the noise characteristics and the voltage stability. The control unit modifies this parameter adaptively to achieve optimal performance in terms of both noise reduction and supply voltage stability.
2Object-affected harmful factors
If the rise time and fall time are controlled to reduce noise, then noise is reduced, but the complexity of the control system increases
Solution Approach 1:
The patent introduces a gate resistor circuit as an intermediary element between the control unit and the switching element. This intermediary component provides a straightforward method to control the rise and fall times of the switching voltage by simply adjusting the gate resistance value, avoiding the need for complex control circuits while still achieving effective noise reduction through slew rate control.
Data Source
AI summary
A controller controls a switching converter configured to convert a power voltage to a supply voltage according to a switching frequency of the switching converter. The supply voltage is supplied to an in-vehicle device. The controller includes a monitoring unit and a voltage control unit. The monitoring unit is configured to monitor a time variation of the supply voltage. The voltage control unit is configured to execute a voltage control in which at least one of a rise time or a fall time of a voltage in the switching converter is controlled based on the time variation of the supply voltage.