DCDC Converter Control Device for Solar Charging Overvoltage Protection
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Solution Overview
Problem
The existing solar charging systems with multiple DCDC converters are prone to overvoltage at intermediate points, which can lead to deterioration and failure of circuit elements due to fluctuations in solar panel-generated power.
Innovation Solution
A control device with a processor that detects voltage at intermediate points and limits the output of DCDC converters to prevent overvoltage, ensuring the output current reaches a predetermined value before stopping the converters' outputs to safely discharge stored charge, thereby protecting circuit elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple DCDC converters are used in parallel to increase power conversion capacity, then the power conversion capability is improved, but the risk of overvoltage at intermediate points increases
Solution Approach 1:
The control device continuously monitors the voltage at the intermediate point and dynamically adjusts the output of each DCDC converter based on real-time voltage feedback. When overvoltage is detected, the controller reduces or stops the output of specific converters to maintain voltage within safe operating limits, thus resolving the contradiction between maintaining high power conversion capacity and preventing overvoltage conditions.
Solution Approach 2:
The system dynamically adjusts the operating state of each DCDC converter based on real-time conditions. The controller can switch converters between active and inactive states, or adjust their output levels, to adapt to fluctuating solar power input and prevent intermediate point overvoltage while maximizing power conversion capacity under normal conditions.
2Reliability
If the output of a DCDC converter is limited to protect against overvoltage, then circuit element protection is improved, but the power conversion efficiency deteriorates
Solution Approach 1:
Instead of limiting the output of all DCDC converters when overvoltage occurs, the control device selectively limits or stops only the specific converter(s) contributing to the overvoltage condition. This partial action approach protects circuit elements from damage while maintaining power conversion efficiency by allowing other converters to continue operating at full capacity.
Solution Approach 2:
The control device performs preliminary checks and adjustments to prevent overvoltage conditions before they cause damage. By proactively monitoring intermediate point voltage and preemptively adjusting converter outputs, the system protects circuit elements while minimizing energy loss, as the converters are only limited when absolutely necessary to maintain safe operating conditions.
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 effectively reduces intermediate point voltage to a safe level, protecting circuit elements from deterioration and failure by stopping the converters' outputs and releasing stored charge, thus ensuring the longevity of the solar charging system components.
Implementation Method 1
a solar panel and the first DCDC converter... Electric power generated by the solar panel is configured to be input to the first DCDC converter
Implementation Method 2
a second DCDC converter and a rechargeable battery connected to the second DCDC converter
Data Source
AI summary
A control device includes a processor configured to detect a voltage at an intermediate point connecting a first DCDC converter and a second DCDC converter, control the first DCDC converter and the second DCDC converter, and when the detected voltage at the intermediate point exceeds a first threshold, limit an output of the first DCDC converter after an output current of the second DCDC converter reaches a predetermined value.