Switching Power Supply Gate Control for Voltage Spike Suppression
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Solution Overview
Problem
In switching power supply circuits, voltage spikes caused by rapid switching and parasitic parameters can damage components and reduce circuit reliability, with existing solutions increasing circuit size and cost while causing energy loss.
Innovation Solution
A control circuit that adjusts the driving signal strength based on a comparison between the switching voltage and a preset voltage, allowing for controlled turning on and off of the power switch, reducing the spike and improving reliability by integrating the control unit and driving unit within a control chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistors and capacitors are added in the peripheral circuit to absorb voltage spikes, then component protection is improved, but circuit area increases and system energy is lost
Solution Approach 1:
The patent introduces a control unit as an intermediary between the switching node and the power switch control terminal. This control unit monitors the switching voltage and dynamically adjusts the driving signal strength, acting as a mediator that prevents voltage spikes without requiring passive energy-dissipating components like resistors and capacitors.
Solution Approach 2:
The control unit implements a feedback mechanism by continuously monitoring the switching voltage at the switching node and using this information to dynamically adjust the driving signal strength. When voltage exceeds a threshold, the control unit reduces driving strength to suppress further voltage rise, creating a closed-loop control system that protects components without energy loss.
2Reliability
If resistors and capacitors are added in the peripheral circuit to absorb voltage spikes, then component protection is improved, but circuit area increases
Solution Approach 1:
The control unit integrates multiple functions including voltage monitoring, comparison logic, and driving signal generation into a single integrated circuit block. This merging of functions eliminates the need for separate peripheral protective components like resistors and capacitors, significantly reducing the overall circuit area while maintaining component protection.
Solution Approach 2:
The control unit serves multiple purposes: it monitors switching voltage, compares it against thresholds, generates appropriate driving signals, and protects power switch components. This multi-functional approach replaces what would traditionally require multiple dedicated components, reducing circuit area while achieving comprehensive protection.
3Productivity
If the power switch is turned on and off rapidly to change voltages and currents, then switching efficiency is improved, but voltage spikes are generated that may damage components
Solution Approach 1:
The control unit dynamically adjusts the driving signal characteristics based on real-time switching voltage conditions. During normal operation, it allows rapid switching for high efficiency. When voltage approaches dangerous levels, it dynamically modifies the driving signal strength to suppress voltage spikes, creating a dynamic balance between switching efficiency and component protection.
Data Source
AI summary
Disclosed is a switching power supply circuit and a control circuit and a control method thereof. The control circuit comprises a control unit and a driving unit. The control unit controls the driving unit to provide a driving signal with different driving strengths according to a comparison result between a switching voltage and a preset voltage, so as to adjust a speed of turning the power switch off. By controlling the driving strength of the driving signal, a rising rate of the switching voltage can be improved, a spike of the switching voltage can be reduced, various components in the circuit can be protected from being damaged by the spike, and service life and reliability of the circuit can be improved.