Backup Power Switching to Block Reverse Discharge Loss
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Solution Overview
Problem
Existing backup power supply systems fail to detect a defective main power supply state accurately, leading to reduced power supply to the load due to power flow from the auxiliary power supply to the main power supply side.
Innovation Solution
A backup power supply system with a disconnect device, charge/discharge device, current detector, and controller that switches between connecting and disconnecting states based on detected discharging current to prevent power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the backup power supply control device determines defective state based on voltage of the first conductive path, then the control device can detect normal/defective states, but the detection fails when charge/discharge device automatically discharges due to voltage decrease, causing power loss to load
Solution Approach 1:
A current detector is introduced as an intermediary component to detect the discharge current from the power storage unit. This current detector provides accurate information about the actual power flow state, enabling the controller to distinguish between normal voltage fluctuations and actual defective states, thereby preventing incorrect disconnection decisions and ensuring continuous power supply to the load.
Solution Approach 2:
The system implements feedback by using the current detector to continuously monitor the discharge current from the power storage unit. This feedback information is fed to the controller, which adjusts the disconnect device state accordingly. When discharge current is detected, the controller maintains the disconnect device in the connecting state to prevent power loss, creating a closed-loop control system that responds dynamically to actual operating conditions.
2Stability of the object's composition
If the disconnect device remains in allowable state during automatic discharge, then voltage of first conductive path is maintained, but power flows to power supply unit side instead of load, reducing available power
Solution Approach 1:
The disconnect device is made dynamic by controlling its state based on real-time discharge current detection. Instead of remaining statically in the allowable state, the disconnect device switches between connecting and disconnecting states according to the detected discharge current. This dynamic control ensures that power is directed to the load when needed while maintaining voltage stability through active management of the power flow paths.
Data Source
AI summary
A backup power supply system (1) includes a first terminal (T1), a second terminal (T2), a disconnect device (10), a current detector (20), a charge/discharge device (30), an auxiliary power supply (40), and a controller (50). The disconnect device (10) is connected between the first terminal (T1) configured to be connected to a main power supply (2) and the second terminal (T2) configured to be connected to a load (3). The charge/discharge device (30) is connected between the auxiliary power supply (40) and a node (P1) between the disconnect device (10) and the second terminal (T2). The charge/discharge device (30) is configured to receive power supplied from main power supply (2) to cause a charging current to flow to the auxiliary power supply (40) in a non-defective state in which the main power supply (2) is not defective. The charge/discharge device (30) is configured to receive power supplied from the auxiliary power supply (40) to cause a discharging current to flow to the load (3) in a defective state. The controller (50) is configured to have the disconnect device (10) be in a connecting state while the current detector (20) does not detect the discharging current, and to have the disconnect device (10) be in a disconnecting state while the current detector (20) detects the discharging current.