Parallel Power Supply Switching Circuit for Zero-Interruption Transfer
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Solution Overview
Problem
Existing power supply systems experience power failures during switching from a main power supply to a standby supply, resulting in a loss of power for approximately 100 ms, which needs to be addressed to achieve zero-power-failure switching.
Innovation Solution
A power supply parallel control circuit that includes a power switching module, multiple switch modules, and a switching control module, which outputs switching signals to control the switch modules to ensure continuous power supply from one power source to another without interruption, using unidirectional conduction to prevent current flow between power sources during switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main power supply is powered down or has insufficient voltage and a standby power supply is switched to, then the power supply can be restored, but the power supply will be lost for about 100 ms at the moment of switching
Solution Approach 1:
The patent applies preliminary action by pre-charging the standby power supply's output capacitor before switching occurs. The control circuit monitors the main power supply voltage and, when it drops below a threshold, automatically switches to the standby power supply which has already been charged and ready, eliminating the power loss gap that would otherwise occur during capacitor charging.
Solution Approach 2:
The patent uses an intermediary approach by introducing a dual-power-supply architecture with a control circuit that manages the transition. The control circuit acts as an intermediary between the main and standby power supplies, detecting voltage drops and orchestrating the switch to maintain continuous power delivery to the load, thereby preventing the 100ms power loss.
2Reliability
If multiple power supplies are used to power a load, then redundancy and reliability are improved, but current may flow between power sources during switching causing conflicts
Solution Approach 1:
The patent applies segmentation by dividing the power supply system into distinct main and standby power supply paths, each with its own switch module. The control circuit selectively activates one path at a time, preventing current from flowing between power sources by ensuring only one power supply is connected to the load at any given moment, thus eliminating the harmful current conflict while maintaining redundancy.
Data Source
AI summary
Disclosed are a power supply parallel control circuit, a method and a device. The circuit includes a power switching module, a first switch module, a second switch module, a third switch module and a fourth switch module all connected to the power switching module. The power switching module outputs a first switching signal according to a received switching control signal and control the second switch module to conduct unidirectionally. The first power supply continuously supplies power to a load and the third switch module is controlled to be on. The fourth switch module maintains unidirectional conduction and the second power supply starts to supply power to the load. The power switching module further outputs a second switching signal after a preset time to turn off the first switch module, the first power supply stops powering the load, and the fourth switch module is turned on.