Inverter Control Power Supply With Auxiliary SMPS Failover
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Solution Overview
Problem
Existing inverter systems rely solely on a main switched-mode power supply (SMPS) which is prone to failures, leading to unreliable operation and potential interruptions in power supply, affecting the overall functionality of the inverter.
Innovation Solution
A control power supply device that senses the output voltage of the main SMPS, interrupts its operation if it falls outside a normal range, and switches to an auxiliary SMPS, while transmitting trip information to the controller to ensure stable power supply and maintain inverter functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sole main SMPS is used to supply power to the inverter, then the device complexity is reduced, but the reliability deteriorates due to high failure rate and potential system interruption
Solution Approach 1:
The power supply system is segmented into a main SMPS for normal operation and a standby SMPS for fault conditions. The control circuit divides the monitoring and control functions into separate modules: voltage sensing unit, comparison unit, and switching control unit. This segmentation allows the system to maintain simplicity while improving reliability through functional distribution.
Solution Approach 2:
The standby SMPS is pre-configured and ready before any fault occurs. The control circuit continuously monitors the main SMPS output voltage and prepares to switch to the standby SMPS immediately upon detecting abnormal conditions. This preliminary preparation eliminates power interruption delays and ensures seamless failover.
2Reliability
If voltage sensing and automatic switching control circuits are added to monitor main SMPS output, then the reliability is improved through automatic failover, but the device complexity increases
Solution Approach 1:
The control circuit implements continuous feedback monitoring of the main SMPS output voltage through the voltage sensing unit. The sensed voltage is fed back to the comparison unit which compares it against reference thresholds. This closed-loop feedback mechanism automatically detects voltage abnormalities and triggers the switching control to activate the standby SMPS, ensuring reliable automatic protection without complex manual intervention.
Solution Approach 2:
The control circuit performs self-monitoring and self-correction functions. When voltage abnormality is detected, the system automatically switches from main SMPS to standby SMPS without external intervention. The switching control unit self-manages the transition process, and the system maintains continuous self-diagnosis capability, reducing the need for external control complexity.
3Productivity
If the main SMPS operation is interrupted and auxiliary SMPS is activated upon voltage abnormality, then the productivity is maintained through continuous power supply, but the device complexity increases
Solution Approach 1:
The auxiliary SMPS is pre-configured in standby mode before any fault occurs, with all necessary control circuits ready to activate immediately. This preliminary preparation ensures that when voltage abnormality is detected, the switch to auxiliary SMPS happens without interruption to the inverter's productivity, maintaining continuous operation while managing complexity through pre-arranged failover paths.
Solution Approach 2:
The control circuit acts as an intermediary between the main SMPS and auxiliary SMPS, managing the transition process. It senses voltage conditions, determines when switching is necessary, and controls the activation sequence. This intermediary role allows the dual SMPS configuration to maintain productivity by ensuring seamless power supply transition while managing the complexity of having two power supply units through centralized control.
Data Source
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AI summary
A control power supply device for an inverter includes a main switched-mode power supply, SMPS, (120) for supplying rated voltages to a controller and an auxiliary circuit of the inverter, an auxiliary SMPS (130) configured to be operated when the main SMPS (120) is interrupted to supply the rated voltages to the controller and the auxiliary circuit of the inverter ; and an SMPS controller (140) configured to sense an output voltage from the main SMPS (120), determine whether the sensed voltage is within a normal range and interrupt the main SMPS (120) and operate the auxiliary SMPS (130) if not, and transmit trip information to the controller (14).