Intelligent Power Supply Dimming Control Voltage Sampling
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Solution Overview
Problem
Intelligent power supplies face issues such as output flicker and excessive power consumption due to circuit instability and high operating currents, particularly in dimming power supplies, which can lead to premature failure of components like MOS tubes.
Innovation Solution
An intelligent power supply system incorporating a constant current/constant voltage module, a dimming control module, and a voltage sampling module, where the dimming control module detects voltage signals from the sampling resistance to adjust its operation mode and prevent flicker, using a switch circuit controlled by the dimming control module to manage power efficiently and protect the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the control part directly takes power from the ACDC control chip, then the system setup is simple, but the ACDC fails to start due to high operating current
Solution Approach 1:
The patent introduces a voltage sampling module as an intermediary between the ACDC control chip and the dimming control module. This module includes sampling resistors that divide the voltage, providing a reduced voltage to the dimming control module's power supply terminal. This intermediary structure allows the control module to operate with lower current draw, enabling the ACDC to start successfully while maintaining system simplicity.
2Reliability
If additional circuits are added to take power from the high voltage end, then the ACDC can start normally, but the system setup becomes complicated
Solution Approach 1:
Instead of adding complex additional power supply circuits from the high voltage end, the patent uses a voltage sampling module that taps into the existing power supply voltage through resistive division. This intermediary approach achieves the same effect of providing reduced voltage to the control module without requiring complex additional circuits, thus maintaining system simplicity.
3Adaptability or versatility
If the dimming control module operates at minimum dimming angle, then the dimming function is achieved, but the input voltage is too low and the chip cannot start
Solution Approach 1:
The patent implements preliminary voltage sampling and division before the dimming control module operates. The voltage sampling module is pre-configured with resistors that provide an appropriate voltage level to the control module's power supply terminal, ensuring the chip can start properly even when the dimming angle is at minimum, thus preventing startup failures.
4Reliability
If the original side control chip is in short-circuit protection mode, then the output is protected, but the MOS tube operates in linear region and power consumption is very high
Solution Approach 1:
The patent implements a feedback mechanism where the dimming control module continuously monitors the voltage at its power supply terminal through the voltage sampling module. When a short circuit occurs and the voltage drops below a threshold, the control module detects this change and adjusts the MOS tube's duty cycle accordingly, reducing power consumption while maintaining protection functionality.
Data Source
AI summary
An intelligent power supply includes: constant current/constant voltage module; dimming control module which is located at a rear end of the constant current/constant voltage module and is electrically connected thereto; switching circuit for electrically connecting the constant current/constant voltage module and load, which is controlled by the dimming control module; the intelligent power supply further including voltage sampling module disposed between the constant current/constant voltage module and the dimming control module; and the power supply voltage of the voltage sampling module is provided by the constant current/constant voltage module, and the dimming control module detects the voltage signal of the sampling resistance of the voltage sampling module in real time; the operating power of the dimming control module is provided by the power supply voltage of the voltage sampling module.