Multiple-Phase Power Circuit Surge Detection
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Solution Overview
Problem
Existing multiple-phase power circuits with digital signal processors (DSPs) face issues with AD conversion frequencies being too low to accurately output corrected voltage during input voltage surges, leading to incorrect over-voltage protection triggers.
Innovation Solution
Incorporating a surge detection circuit that samples input voltage and compares it with a reference voltage, outputting control signals to the controller to stop PWM signals during surges, preventing high driving voltage outputs and thus avoiding over-voltage protection triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the AD conversion frequency of the DSP is used for voltage monitoring, then the system can detect voltage status, but the conversion frequency is too low to accurately detect rapid voltage surges
Solution Approach 1:
The voltage detection function is segmented into two independent paths: a fast analog surge detection circuit for rapid response and a DSP-based digital monitoring system for comprehensive control. The analog circuit handles rapid surge detection while the DSP handles normal voltage monitoring, resolving the contradiction between detection speed and measurement precision.
Solution Approach 2:
An analog surge detection circuit acts as an intermediary between the voltage input and the DSP controller. This intermediary circuit pre-processes voltage surges by generating immediate detection signals before the DSP can sample, bridging the gap between fast analog response and digital control capabilities.
2Reliability
If the DSP controls voltage conversion with standard AD conversion frequency, then the system operates normally, but it triggers false over-voltage protection during input voltage surges
Solution Approach 1:
The analog surge detection circuit performs preliminary detection of voltage surges before they can cause false triggers in the DSP-based over-voltage protection. By detecting surges in advance and generating early warning signals, the system takes preliminary action to prevent false protection triggers while maintaining reliable over-voltage protection.
Solution Approach 2:
The surge detection circuit provides feedback signals to the controller that override or modify the over-voltage protection logic during detected surges. This feedback mechanism allows the system to distinguish between actual over-voltage conditions requiring protection and transient surges that would cause false triggers, improving protection accuracy.
Data Source
AI summary
A multiple-phase power circuit includes multiple voltage conversion units, a pulse-width modulation (PWM) signal generator and a surge detection circuit. Each voltage conversion unit converts an input voltage to a driving voltage of a pre-set phase. The pulse-width modulation (PWM) signal generator is coupled to the voltage conversion units to output PWM signals of different phases to the voltage conversion units. The surge detection circuit samples the input voltage and compares the input voltage with a reference voltage. Then the surge detection circuit outputs multiple first control signals. The PWM signal generator further stops outputting the PWM signals of different phases when the PWM signal generator receives the multiple first control signals.