DC Uninterruptible Power Supply System with Voltage Comparator Control
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Solution Overview
Problem
Existing DC uninterruptible power supply systems can malfunction due to electromagnetic interference, leading to incorrect power outage detection and unnecessary discharge of auxiliary power supplies, and require complex circuit configurations for AC-DC power conversion.
Innovation Solution
A DC uninterruptible power supply system that connects directly to a DC power conversion system, using a comparator and relay to switch between DC power from the conversion system and an internal auxiliary power supply, eliminating the need for a central processing unit and simplifying the circuit by operating in a purely DC state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a CPU is used to control power conversion and detection, then the system can perform complex control operations, but the system becomes vulnerable to electromagnetic interference and hardware/software failures causing malfunction
Solution Approach 1:
The patent removes the CPU from the system entirely, extracting the source of electromagnetic interference and potential failures. The control functions previously performed by the CPU are replaced with simple voltage comparison circuitry that directly controls the relay switch, eliminating the need for complex processing while improving reliability.
Solution Approach 2:
The patent replaces the electronic control system (CPU-based) with a simpler voltage comparison and relay control system. The comparator circuit directly compares voltages and triggers the relay without needing software processing, substituting a more reliable hardware-based control mechanism.
2Adaptability or versatility
If AC-DC power conversion circuits are implemented, then the system can convert prevailing AC power into DC power for charging, but the circuit configuration becomes complicated
Solution Approach 1:
The patent changes the operating parameter from AC power to DC power throughout the entire system. By designing the system to operate directly with DC power from solar panels or batteries, there is no need for AC-DC conversion circuits, thereby simplifying the overall circuit configuration while maintaining adaptability to DC power sources.
3Ease of operation
If the system waits for CPU detection of power outage, then the control logic can be flexible, but power supply to the load is interrupted during detection delay
Solution Approach 1:
The patent implements preliminary action by having the voltage comparator continuously monitor the power source voltage and prepare to switch to battery power immediately when voltage drops occur. The relay control circuit is pre-configured to respond instantly to voltage changes, eliminating any detection or processing delay that would occur with CPU-based monitoring.
Solution Approach 2:
The patent replaces the CPU-based detection and control system with a direct voltage comparison and relay control system. The comparator continuously monitors voltage levels and triggers the relay switch immediately when power source voltage becomes insufficient, providing instantaneous response without software processing delays.
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
Ensures continuous power supply to loads without CPU malfunctions, prevents unnecessary discharge of auxiliary power supplies, and simplifies the circuit configuration by eliminating the need for AC-DC power conversion.
Implementation Method 1
a comparator which compares a level of a DC voltage power supplied from the DC power conversion system with a level of a set reference voltage and outputs a clear voltage or a set voltage according to a result of the comparison
Implementation Method 2
a switchover portion which includes a relay connected to the first connection unit, the second connection unit, and the discharge portion
Implementation Method 3
a charging portion which boosts a level of DC voltage power supplied from the DC power conversion system and charges the auxiliary power supply device with the boosted DC voltage power
Implementation Method 4
a discharge portion which generates internal voltage power by stepping down a level of voltage power of the auxiliary power supply device
Data Source
AI summary
Disclosed is a direct current uninterruptible power supply system. The direct current uninterruptible power supply system according to an embodiment of the present invention is electrically connected to a direct current power converter for converting commercial alternating current power to direct current power, in order to: supply the direct current power to a load and charge an auxiliary power supply device therein with the direct current power. In the case of a short circuit of the direct current power converter due to a current leakage or breakage of the direct current power converter, or if the direct current power converter is disconnected, the direct current uninterruptible power supply system enables the auxiliary power supply device to constantly supply power to the load while completely blocking the electrical connection to the direct current power converter.