Series Converter Power Limiting via Feedback Control
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Solution Overview
Problem
Existing power supply devices with multiple converters connected in series face challenges in preventing overload situations when a second converter is connected to a first converter with lower maximum output power, leading to potential damage and inefficiency, especially during changes in lighting systems where the power consumption exceeds the first converter's capacity.
Innovation Solution
Incorporating a power consumption limiter and controller in the second converter, which receives a load index from the first converter via a data line, allowing the second converter to adjust its power consumption based on the first converter's maximum power, ensuring it does not exceed the first converter's capacity, and using a microcontroller to manage this process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first converter is designed with higher maximum power to prevent overload situations, then the reliability of the power supply system is improved, but the cost of the converter increases
Solution Approach 1:
The second converter is equipped with a controller that receives information about the maximum output power of the first converter and automatically limits its power consumption accordingly. This feedback mechanism allows the system to adapt to the actual capabilities of the power supply without requiring manual intervention or oversizing the first converter.
Solution Approach 2:
The second converter autonomously monitors and regulates its own power consumption based on the capabilities of the first converter. The controller in the second converter actively manages the power draw to prevent overload conditions, making the system self-regulating without external control.
2Productivity
If the second converter is allowed to consume maximum required power, then the productivity of the electrical load is improved, but the first converter may be damaged due to overload
Solution Approach 1:
The controller in the second converter continuously monitors the maximum output power capability of the first converter and adjusts the power consumption of the second converter accordingly. This feedback loop ensures that the power draw never exceeds the safe limits of the first converter while maximizing the usable power output.
Solution Approach 2:
The system dynamically adjusts the power consumption parameter of the second converter based on the maximum output power parameter of the first converter. The controller modifies operating parameters such as current draw or switching frequency to maintain power consumption within safe limits.
3Manufacturing precision
If manual matching of converters is required, then the manufacturing precision of the power supply system is improved, but the ease of operation is worsened
Solution Approach 1:
The converters automatically perform mutual identification and capability exchange through the data line. The second converter autonomously queries and stores information about the first converter's maximum output power, eliminating the need for manual matching or configuration during installation or replacement.
Solution Approach 2:
The capability information of the first converter is transmitted and stored in advance during the connection establishment phase. This preliminary exchange of information allows the second converter to be pre-configured with the appropriate power limits before actual operation begins, streamlining the installation process.
Data Source
Figure 1~2
AI summary
A power supply device 1 for at least one electrical load 11 comprises two converters 3, 4 connected in series via an interface. A first converter 3 provides a constant voltage at the interface up to a certain maximum power, and a second converter 4 converts the voltage provided by the first converter into a current required to operate the at least one electrical load 11. The second converter 4 has a power limiter for limiting the power drawn from the first converter 3 and a control for controlling the power limiter to reduce its power draw when the maximum power required by the second converter 4 is greater than the maximum power of the first converter 3.Furthermore, a method for operating an electrical load 11 supplied with energy by a converter 4 is described. This converter 4 is connected in series with a first converter 3 and draws its energy for supplying at least one electrical load 11 from the first converter 3. The power consumption of the second converter 4, connected in series with the first converter 3, is reduced if the power required by the second converter 4 is greater than or becomes greater than the maximum power of the first converter 3.