Parallel Power Supply Voltage Drop Prevention
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Solution Overview
Problem
High-end electronic products face instability and unexpected power-offs due to oversized voltage drops when one power supplier fails or experiences over voltage, leading to deviations in feedback control and duty cycle reduction, resulting in insufficient power delivery.
Innovation Solution
A power supply apparatus with a first power supplier equipped with a main power generating unit, isolation diode, resistors, voltage feedback controller, and current detecting unit, along with an over voltage detecting unit, which adjusts the duty cycle and voltage to maintain stable output voltage and prevent oversized voltage drops by increasing main power when the second power supplier is over voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If negative feedback control is used to regulate power output, then power regulation accuracy is improved, but when one power supplier fails, the duty cycle decreases to a limit causing oversized voltage drop and power insufficiency
Solution Approach 1:
The patent implements a feedback mechanism where the current detecting unit monitors the current through the first resistor and generates an adjustment signal. This feedback loop allows the system to detect when the duty cycle approaches its limit and compensates by adjusting the voltage of the second terminal of the second resistor, preventing oversized voltage drops while maintaining accurate power regulation.
Solution Approach 2:
The over voltage detecting unit performs preliminary detection of over voltage conditions before they cause failure. When over voltage is detected in one power supplier, the system proactively adjusts the duty cycle and main power output of the other power supplier in advance, ensuring continuous stable power supply without waiting for actual failure to occur.
2Power
If two power suppliers are coupled in parallel to provide required electric power, then power delivery capability is improved, but when one power supplier fails due to over voltage, the load increases drastically causing oversized voltage drop
Solution Approach 1:
The patent introduces intermediate control elements including the current detecting unit, over voltage detecting unit, and adjustment signal generation mechanism. These intermediaries monitor the system state and mediate between the two power suppliers, detecting over voltage conditions and adjusting the operational parameters of the healthy power supplier to compensate for the failing one, thereby preventing excessive voltage drops.
Solution Approach 2:
The system dynamically changes operational parameters including the duty cycle of the control signal and the voltage of the second terminal of the second resistor. When one power supplier experiences over voltage, the system adjusts these parameters in real-time to optimize the output of the other power supplier, maintaining stable power delivery while avoiding oversized voltage drops.
3Reliability
If the duty cycle of the control signal is decreased to limit to compensate for over voltage, then over voltage protection is improved, but the power supplier stops functioning and causes system instability
Solution Approach 1:
The over voltage detecting unit performs preliminary detection of over voltage conditions before they force the duty cycle to its limit. This early detection allows the system to proactively adjust the main power output and coordinate with the other power supplier, maintaining system stability and continuous operation without abrupt shutdowns or instability.
Data Source
AI summary
A power supply apparatus is provided. The power supply apparatus includes two power suppliers coupled in parallel so as to simultaneously supply the electric power required by an electronic product in operation. The power supply apparatus provided by the invention may stably/accurately output the desired DC output voltage to the electronic product, and may further in advance increase a main power generated inside the other power supplier when one of the power suppliers is over voltage, thereby avoiding an oversized voltage drop from occurring in the DC output voltage.