Switching Converter Overshoot Control With Dummy Load Discharge
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Solution Overview
Problem
Conventional DC-DC switching converters experience significant output voltage overshoot during load current transitions due to the inability of the inductor current to change instantaneously, leading to performance degradation in connected digital devices.
Innovation Solution
A switching converter with a control circuit that compares output voltage to a threshold, detects overshoot, and either disables switches or activates a dummy load to increase the inductor discharge current slope or engage a dummy load circuit to reduce overshoot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inductor current is used to supply load current transitions, then the converter operates efficiently with simple control, but the output voltage experiences large overshoot when load current changes rapidly
Solution Approach 1:
The control circuit proactively detects load current transitions and preemptively adjusts the inductor current slope before the output voltage overshoot occurs. By monitoring the load current and anticipating the need for rapid voltage regulation, the system modifies the inductor discharge rate in advance, preventing the overshoot rather than correcting it after occurrence.
Solution Approach 2:
The patent dynamically changes the inductor current slope based on real-time operating conditions. During normal operation, the converter uses standard inductor current regulation for efficiency. During rapid load transitions, the control circuit dynamically increases the inductor discharge slope to quickly respond to load changes, then returns to normal operation, making the system adaptable to different conditions.
2Speed
If the inductor current slope is increased to reduce output voltage overshoot, then the response speed improves, but the energy loss increases
Solution Approach 1:
The control circuit applies periodic or pulsed high-slope inductor discharge only during the brief period when load transition occurs and overshoot is detected. Instead of maintaining high discharge slope continuously, the system uses normal slope during steady-state operation and switches to high slope temporarily during transitions, then returns to normal operation, minimizing energy waste while maintaining fast response when needed.
Solution Approach 2:
The patent changes the inductor current slope parameter dynamically based on operating conditions. During rapid load transitions, the slope parameter is increased to improve response speed. During normal operation, the slope returns to its standard value to minimize energy loss. This parameter modulation allows the system to optimize between speed and efficiency based on real-time needs.
Data Source
AI summary
Disclosed is a switching converter. The switching converter includes a first switch and a second switch. The first switch and the second switch 104 are configured to regulate charging and discharging of an inductor. The switching converter also includes a control circuit configured to compare an output voltage of the switching converter with a threshold voltage. The control circuit is also configured to detect an overshoot in the output voltage based on the comparison. Further, the control circuit is configured to perform at least one of disable, based on the detection of the overshoot in the output voltage, each of the first and the second switch to increase a slope of an inductor discharge current flowing across the inductor, or activate a dummy load circuit such that the overshoot in the output voltage is reduced.