Power Calibration Feedback Circuit for Capacitor Overvoltage Protection
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Solution Overview
Problem
Conventional power calibration circuits experience delayed feedback response, leading to high-voltage capacitors being exposed to excessive voltage, which is costly to mitigate with high-voltage capacitors.
Innovation Solution
Incorporating an auxiliary voltage feedback unit with a voltage dividing circuit and a voltage limiting circuit that interferes with the main feedback voltage only when the output terminal voltage exceeds a reference voltage, allowing the control unit to respond promptly and prevent excessive voltage exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional feedback control mechanism is used, then the power calibration circuit can maintain stable operation, but the response delay causes high-voltage capacitors to be exposed to excessive voltage
Solution Approach 1:
The patent introduces an auxiliary voltage feedback unit that detects voltage at a dividing node before the excessive voltage condition fully develops. By performing preliminary detection and triggering early intervention through the voltage limiting circuit, the system prevents the harmful condition rather than reacting after it occurs, thus protecting capacitors without requiring faster conventional feedback response
Solution Approach 2:
The patent introduces an auxiliary voltage feedback unit as an intermediary detection mechanism. This unit samples voltage through a voltage dividing circuit and provides early warning signals to the control unit, acting as a mediator between the output voltage and the control decision-making process, enabling preventive action before excessive voltage damages components
2Reliability
If high-voltage capacitors with higher voltage withstand capability are used, then the capacitors can endure excessive voltage during response delay, but the cost increases
Solution Approach 1:
The patent replaces expensive high-voltage capacitors with cheaper standard-voltage capacitors by introducing a low-cost auxiliary voltage feedback and limiting mechanism. The voltage limiting circuit acts as a protective precursor that prevents excessive voltage from reaching the capacitors, allowing the use of less expensive components while maintaining system reliability
Solution Approach 2:
The auxiliary voltage feedback unit serves as an intermediary protective layer between the power calibration circuit output and the capacitors. This intermediary mechanism detects and signals potential excessive voltage conditions early, preventing direct exposure of capacitors to harmful voltage levels, thus eliminating the need for expensive high-voltage rated capacitors
Data Source
AI summary
A control module of a power calibration circuit comprises a control unit, a main voltage feedback unit and an auxiliary voltage feedback unit, the control unit is connected to at least one power switch, the main voltage feedback unit is connected to an output terminal of the power calibration circuit and the control unit, the auxiliary voltage feedback unit is connected to the output terminal and the control unit, the auxiliary voltage feedback unit comprises a voltage dividing circuit connected to the output terminal and having at least one voltage dividing node, and a voltage limiting circuit connected to the voltage dividing node and the control unit, the voltage limiting circuit has a first state when a voltage of the voltage dividing node is not higher than a reference voltage, and a second state when a voltage of the voltage dividing node is higher than the reference voltage.