Uninterruptible DC Power Supply Relay Control
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Solution Overview
Problem
Uninterruptible power supply systems using central processing units (CPUs) can malfunction due to electromagnetic interference, leading to incorrect power outage detection and unnecessary discharge of auxiliary power supplies, causing disruptions in critical loads like network servers and CCTV systems, and the circuit configuration is complex.
Innovation Solution
An uninterruptible DC power supply system that operates without CPU control, using a connection controller with a relay, boosting and step-down transformers, and a power supply controller with a current sensor and comparator to continuously supply power from an auxiliary power source while disconnecting from the DC power conversion system in case of faults or disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a CPU is used to control power conversion and supply operations, then the system can intelligently detect power outages and manage power flow, but the CPU may malfunction due to electromagnetic waves or hardware/software errors, causing wrong power outage detection and unnecessary discharge of auxiliary power supply
Solution Approach 1:
The patent extracts the CPU control function from the power supply system and replaces it with a relay-based automatic control mechanism. The relay directly responds to voltage changes without requiring processing, eliminating the reliability issues associated with CPU malfunction under electromagnetic interference while maintaining automatic power management capability.
Solution Approach 2:
The system uses the auxiliary power supply's own voltage to control the relay state. When voltage drops occur, the auxiliary power supply automatically activates through its own voltage output, eliminating the need for external control signals that could be affected by electromagnetic interference or software errors.
2Ease of operation
If a CPU-controlled system waits to detect power outages, then normal operation can be maintained during transient disturbances, but power supply to critical loads like network servers and CCTV systems is interrupted during actual outages due to detection delays
Solution Approach 1:
The relay is pre-configured to automatically switch to auxiliary power supply mode when voltage drops occur, eliminating detection and response delays. The system is prepared in advance with the relay positioned to instantly activate the auxiliary power supply without requiring real-time processing or decision-making during the outage event.
3Adaptability or versatility
If a CPU-controlled bidirectional power conversion system is implemented, then power can be converted from AC to DC and back to AC as needed, but the circuit configuration becomes complicated
Solution Approach 1:
The patent removes the complex bidirectional AC-DC-AC conversion circuitry and retains only the essential AC to DC conversion function. The auxiliary power supply directly provides DC output without requiring conversion back to AC, significantly simplifying the circuit configuration while maintaining the core uninterruptible power supply functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents unnecessary power discharge and simplifies the circuit configuration by allowing continuous power supply to critical loads without CPU intervention, ensuring reliable operation during DC power conversion system failures.
Implementation Method 1
a relay allowing a connection state to be changed according to a voltage
Implementation Method 2
a boosting transformer boosting a voltage level of the DC power when the relay is in the first connection state
Implementation Method 3
a step-down transformer lowering a voltage level of the auxiliary power supply when the relay is in the second connection state
Data Source
AI summary
Provided is an uninterruptible direct current (DC) power supply system, which includes a first connection unit electrically connected to a DC power conversion system which converts prevailing AC power into the DC power, a second connection unit which is electrically connected to the load and supplies the DC power to the load, an auxiliary power supply charged by the DC power, and an uninterruptible control unit which supplies the DC power supplied from the DC power conversion system normally connected to the first connection unit to the load through the second connection unit, charges the auxiliary power supply, and controls power to be continuously supplied to the load while perfectly cutting off electrical connection between the DC power conversion system and the auxiliary power supply when the DC power conversion system is disconnected from the first connection unit, is damaged, or short-circuits.