Constant Power Protection Circuit for Voltage Current Control
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Solution Overview
Problem
Conventional power supply devices cannot provide constant power, as they typically operate in either constant voltage or constant current modes, failing to maintain a consistent power output.
Innovation Solution
A constant power protection circuit comprising a voltage conversion circuit, current detection circuit, voltage detection circuit, power setting circuit, voltage feedback circuit, current feedback circuit, and signal isolation unit, which works by detecting output voltage and current levels to adjust the power mode and ensure a constant power output to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power supply devices operate in constant voltage or constant current mode, then they can maintain stable voltage or current output, but they cannot provide constant power output
Solution Approach 1:
The patent implements dynamic switching between constant voltage mode and constant power mode based on real-time detection of output voltage and current. The control circuit continuously monitors the output parameters and dynamically adjusts the operating mode to maintain constant power when required, while preserving the ability to operate in constant voltage or constant current modes when appropriate.
Solution Approach 2:
The patent changes the control parameter from fixed voltage or current control to dynamic power-based control. By detecting output voltage and current values and comparing them against reference values, the system adjusts the operating mode to maintain constant power output, fundamentally changing how the power supply regulates its output.
2Power
If power supply devices add constant power control functionality, then they can provide constant power output, but the device complexity increases
Solution Approach 1:
The patent merges the constant power control functionality with the existing constant voltage and constant current control circuits. The detection circuit, comparison circuit, and switching control are integrated into the existing power supply architecture, allowing multiple control modes to share common components rather than requiring separate independent control systems.
Solution Approach 2:
The control circuit is designed with multi-functionality to handle constant voltage, constant current, and constant power modes using a unified control architecture. The same detection and control components serve multiple purposes depending on the operating conditions, reducing the need for dedicated components for each mode.
3Power
If the power supply device continuously monitors output voltage and current to maintain constant power, then power stability is improved, but the measurement and control complexity increases
Solution Approach 1:
The patent implements feedback control by continuously detecting output voltage and current, comparing them against reference values, and adjusting the operating mode based on the comparison results. The feedback mechanism uses simple comparison logic to determine when to switch between constant voltage and constant power modes, maintaining power stability without requiring complex measurement and control algorithms.
Data Source
AI summary
A constant power protection circuit includes a voltage conversion circuit, a current detection circuit, a voltage detection circuit, a power setting circuit, a voltage feedback circuit, an addition circuit, a current feedback circuit, and a signal isolation unit. When an output voltage of the voltage conversion circuit is larger than a voltage of the voltage detection circuit and an output current of the voltage conversion circuit is larger than a current of the current detection circuit, the power setting circuit provides a comparison signal to the current feedback circuit, the current feedback circuit outputs a feedback signal to the signal isolation unit. According to a signal outputted from the signal isolation unit, the voltage conversion circuit enables a constant power mode.