Uninterruptible Power Supply Logic Circuit for Battery-Free Start-Up
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Solution Overview
Problem
Existing UPS systems face challenges in starting up without batteries and in achieving energy efficiency, as they rely on battery power for initial start-up and cannot turn on immediately when AC mains power is restored if batteries are drained, leading to inefficiencies and potential power outages.
Innovation Solution
The design includes a UPS with a first and second logic power supply, a main logic power supply, a charger, and power converter circuitry, allowing operation without batteries by using input power to charge the backup power source and providing power through a communication circuit for user-selectable modes, including a sleep mode and green mode, which reduces power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UPS uses battery power for initial start-up, then the UPS can operate without external power, but the UPS cannot start immediately when AC mains power is restored if batteries are drained
Solution Approach 1:
The patent extracts the battery component from the UPS system by designing a logic power supply that can operate directly from AC mains power. The system removes the intermediary battery element while maintaining the ability to provide uninterrupted power through direct AC-to-logic power supply conversion, enabling immediate start-up without battery dependency.
Solution Approach 2:
The patent introduces an AC-to-DC converter as an intermediary component that directly converts AC mains power to the DC voltage required by the logic power supply. This intermediary eliminates the need for batteries by providing a direct power conversion path, allowing the UPS to start immediately when AC power is available.
2Ease of operation
If a UPS operates with full power consumption, then all functions are available, but energy efficiency is reduced
Solution Approach 1:
The patent implements dynamic power management by enabling the logic power supply to switch between different operational states (full power mode and sleep mode). The system can dynamically adjust its power consumption based on operational requirements, transitioning to a low-power state when full functionality is not needed, thereby improving energy efficiency while maintaining operational capability when required.
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
Enables uninterrupted power supply without batteries, improves energy efficiency by reducing power consumption in sleep and green modes, and ensures immediate start-up when AC mains power is available, enhancing reliability and efficiency.
Implementation Method 1
The battery charger, which converts AC power to DC power, may be included in the UPS to charge the batteries when AC mains is available
Implementation Method 2
an inverter coupled to the AC-to-DC converter and the UPS output
Data Source
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AI summary
An uninterruptible power supply includes a first input (202) to receive input power from an input power source, an output (230) to provide output power, a switch (206), a first logic power supply (210) coupled to the switch, a back-up power source (216), a charger (220), a main logic power supply (212) and power converter circuitry. The switch (206) is configured to close when a characteristic of the input power is within a selected range. The first logic power supply is coupled to the switch and configured to receive input power from the input power source when the switch is closed. The first logic power supply has a first DC output. The back-up power source has a second DC output and is coupled to the first DC output at a common node. The charger (220) has a third DC output and is coupled to the common node. The main logic power supply (212) is coupled to the common node and is configured to receive at least one of the first DC output, the second DC output and the third DC output. The power converter circuitry is coupled to the backup power source and the first input and is configured to provides the output power derived from at least one of power at the first input and power from the backup power source.