Power-Taking Circuit for Photovoltaic Bypass Control
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Solution Overview
Problem
Existing photovoltaic component control devices face challenges in ensuring continuous and stable power supply, particularly when safety failures occur, leading to issues like overvoltage, undervoltage, and high energy consumption, which can compromise system reliability and stability.
Innovation Solution
A power-taking circuit and parallel-type photovoltaic component control device that includes a pump-type voltage clamped circuit and comparison circuit to manage power supply by generating and storing internal voltage, ensuring stable output through bypass control, thereby avoiding overvoltage and undervoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photovoltaic component is turned off to stop power output in case of safety failure, then safety is improved, but the power supply stability of the control device deteriorates
Solution Approach 1:
The energy storage circuit stores energy in advance during normal operation, so when the photovoltaic component is turned off for safety, the control device can continue to operate using the pre-stored energy, maintaining power supply stability
2Device complexity
If traditional power supply methods are used, then the structure is simple, but overvoltage and undervoltage occur leading to energy loss
Solution Approach 1:
The voltage detection circuit continuously monitors the voltage output by the energy storage circuit and feeds this information back to the control circuit, which adjusts the switching state of the energy storage circuit accordingly to maintain voltage within the normal range, avoiding overvoltage and undervoltage conditions
Solution Approach 2:
The energy storage circuit dynamically changes its operating parameters (switching between charging and discharging states) to maintain voltage within the normal range, preventing energy loss from overvoltage or undervoltage conditions
3Reliability
If the photovoltaic component control device stops power output to ensure safety, then safety is improved, but system productivity deteriorates
Solution Approach 1:
The system is divided into two independent power sources: the photovoltaic component for main power output and the energy storage circuit for control device power supply. This segmentation allows the control device to maintain operation independently when the photovoltaic component is turned off, ensuring both safety and continued functionality
Solution Approach 2:
The energy storage circuit acts as an intermediary power source between the photovoltaic component and the control device. When the photovoltaic component is turned off for safety, the energy storage circuit mediates by providing alternative power to the control device, maintaining system functionality without compromising safety
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
The solution provides continuous and stable power supply, improves power output, and enhances system reliability by eliminating energy loss and allowing independent removal of faulty components without affecting normal operation.
Implementation Method 1
a pump-type voltage clamped circuit configured to release and output energy to generate a first internal voltage in a case that the bypass circuit is turned on, and generate the first internal voltage according to an output voltage of the photovoltaic component and store the energy in a case that the bypass circuit is turned off
Data Source
AI summary
The present disclosure relates to a power-taking circuit suitable for use in conjunction with a bypass circuit of a photovoltaic component, a parallel-type photovoltaic component control device, and a photovoltaic string power distribution system. In embodiments of the present disclosure, the power-taking circuit includes a pump-type voltage clamped circuit configured to release and output energy to generate a first internal voltage in a case that the bypass circuit is turned on, and generate the first internal voltage according to an output voltage of the photovoltaic component and store the energy in a case that the bypass circuit is turned off; and a comparison circuit configured to generate a first control signal according to the first internal voltage so that the bypass circuit is controlled to be turned off or turned on according to the first control signal.