UPS Voltage Detection Circuit Simplification via Equipotential Grounding
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Solution Overview
Problem
Conventional UPS systems have complex and costly voltage and frequency detection circuits due to the need for isolating components to account for voltage differences between the neutral line and system ground, leading to increased complexity and production costs.
Innovation Solution
A simplified UPS system with a voltage division module using multiple voltage dividers to equate the neutral line and system ground potential, and a frequency detection module with resistors and an AC detection unit to simplify circuitry and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If isolating components are used to account for voltage differences between neutral line and system ground, then voltage detection accuracy is improved, but circuit complexity and production costs increase
Solution Approach 1:
The patent applies the equipotentiality principle by making the neutral line and system ground equipotential through proper grounding configuration. This eliminates the voltage difference between neutral line and system ground, removing the need for isolating components while maintaining accurate voltage detection. The detection circuit can directly measure voltage without complex isolation mechanisms.
2Measurement precision
If isolating components are used to account for voltage differences between neutral line and system ground, then voltage detection accuracy is improved, but production costs increase
Solution Approach 1:
By establishing equipotential between neutral line and system ground through grounding configuration, the patent eliminates the need for expensive isolating components. This reduces production costs while maintaining accurate voltage detection capability through simpler, more cost-effective circuitry.
3Difficulty of detecting and measuring
If current transformers are used for current detection, then detection capability is improved, but device size and complexity increase
Solution Approach 1:
The patent replaces the mechanical/current transformer-based detection system with an operational amplifier-based electronic detection system. This substitution eliminates bulky current transformers and complex magnetic coupling mechanisms, achieving accurate current detection through electronic amplification while significantly reducing circuit complexity and device size.
4Difficulty of detecting and measuring
If current transformers are used for current detection, then detection capability is improved, but device size increases
Solution Approach 1:
The patent replaces bulky current transformers with compact operational amplifier circuits for current detection. This substitution dramatically reduces the physical size of the detection system while maintaining accurate current measurement capability through electronic signal amplification rather than magnetic transformation.
Data Source
AI summary
A UPS system having a system ground terminal includes a main circuit having a power input terminal set connected to the AC mains, two switches respectively corresponding to a live line and a neutral line of the AC mains, a frequency detection module connected to the power input terminal set, a voltage division module composed of multiple voltage dividers, and the two switches and a central controller grounded through the system ground terminal and connected to the frequency detection module. The system ground terminal is connected to the neutral line through one of the switches. The central controller and the neutral line are equipotential after the frequency detection module detects a normal mains power and the central controller controls the switch connected to the neutral line to switch on. With the foregoing circuit, the UPS system can detect the voltage of the mains power in a simplified fashion.