Photovoltaic Power Switch Circuit With Power-Threshold Start Control

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Solution Overview

Problem

Existing solar photovoltaic power generation systems face inefficiencies due to early or late start times, leading to power consumption from external grids or battery waste, as they rely on voltage detection to determine when to start, often resulting in wasted energy and reduced efficiency.

Innovation Solution

A power switch circuit that includes a solar photovoltaic panel, a detection circuit, and a switch circuit, where the detection circuit checks if the power signal exceeds a preset threshold, triggering the switch circuit to turn on and supply power to a load, while simultaneously stopping the detection circuit's operation, thereby optimizing the start time and reducing energy waste.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If voltage detection is used to determine start time, then the power generation system can avoid consuming external power, but the start time is delayed and solar energy is wasted

Engineering Contradiction:

Improvepower supply reliabilityVSAvoidsolar energy waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent changes the detection parameter from voltage to power (P=UI). The detection circuit monitors both voltage and current signals from the photovoltaic panels and calculates real-time power output. When power exceeds a preset threshold, the system starts. This parameter change allows earlier and more accurate detection of sufficient power availability, preventing solar energy waste while ensuring reliable power supply.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional voltage-only detection mechanisms with a power-based detection system that processes both voltage and current signals. The detection circuit uses operational amplifiers and comparison circuits to evaluate actual power output rather than relying solely on voltage thresholds, enabling more precise control of the start time.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If voltage detection point is set higher to prevent external power consumption, then power supply reliability improves, but solar energy utilization efficiency decreases

Engineering Contradiction:

Improvepower supply reliabilityVSAvoidphotovoltaic power generation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the detection circuit continues working after power supply starts, then detection accuracy is maintained, but energy consumption increases

Engineering Contradiction:

Improvedetection accuracyVSAvoiddetection circuit energy consumption

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent implements periodic action by controlling the detection circuit to operate only during specific periods: before power supply start and during power-off state. Once the system starts and the power switch closes, the detection circuit automatically stops working. This periodic operation pattern maintains detection accuracy when needed while eliminating unnecessary energy consumption during normal operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent extracts the detection function from continuous operation and separates it into a pre-start detection phase and a post-start shutdown phase. The detection circuit is taken out of service after the power switch closes, removing the energy-consuming detection function from the ongoing system operation while preserving its accuracy-critical role during the start-up decision phase.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This solution effectively prevents power waste by ensuring the solar photovoltaic panel supplies power only when it exceeds the threshold, improving the power generation capacity and efficiency of photovoltaic power generation by controlling the start time based on actual power availability.

Implementation Method 1

solar photovoltaic panel is configured to provide an electrical signal to the detection circuit

Methodology Applied

Scientific EffectPhotovoltaic effect: Photovoltaic Effect

Data Source

PatentUS11881812B2Power switch circuit and power switch

Publication Date: 2024.01.23 SHENZHEN POWEROAK NEWENER CO LTD

AI summary

A power switch circuit includes a switch circuit, a solar photovoltaic panel and a detection circuit and connected with the solar photovoltaic panel and the switch circuit respectively. The solar photovoltaic panel is configured to provide an electrical signal to the detection circuit, the detection circuit is configured to detect whether the power in the electric signal exceeds a preset threshold, and when the power exceeds the preset threshold, the detection circuit outputs a first control signal to the switch circuit to turn on the switch circuit; when the switch circuit is turned on, the solar photovoltaic panel supplies power to the load through the switch circuit, and the switch circuit feeds back a second control signal to the detection circuit so that the detection circuit stops working.