Digital Control Circuit for Lamp Ballast Using Dynamic Reference Values
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Solution Overview
Problem
Existing digital control circuits for lamp operating devices are becoming overly simplified, leading to reduced flexibility in managing various parameters despite the need for efficient power control and compatibility with supply voltage and periphery components.
Innovation Solution
A digital control circuit for lamp operating devices that processes analog measurement signals by comparing them with adjustable reference values, using a D/A converter to generate control signals, allowing for flexible operation and adaptation to current states and phases of the lamp, with a central control unit managing sequence control and storing reference values in memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital control circuits are simplified with fewer components, then device complexity is reduced, but flexibility in managing various parameters deteriorates
Solution Approach 1:
The patent implements a universal digital control circuit that can handle multiple parameter types (analog measurement signals, digital inputs, reference values) through a unified architecture. The circuit uses a single comparator that can process different signal types by selecting appropriate reference values from memory, making the control circuit adaptable to various operating conditions without requiring separate dedicated circuits for each function.
Solution Approach 2:
The control circuit employs dynamic reference values that can be adjusted based on the current operating state of the lighting device. The microcontroller selectively loads different reference values from memory into the comparator depending on the detected operating condition, enabling the circuit to adapt its comparison criteria dynamically rather than using fixed reference values, thus maintaining flexibility with a simplified structure.
2Device complexity
If multiple parameters are processed with a simplified control circuit, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The control circuit continuously monitors the operating state through analog measurement signals and compares them against stored reference values. The microcontroller adjusts the reference values based on feedback from the actual operating conditions, ensuring that the comparison remains accurate across different operating states. This feedback mechanism maintains measurement precision despite the simplified circuit architecture.
Solution Approach 2:
The patent changes the reference parameter values dynamically based on the operating state. Different reference values are loaded into the comparator depending on whether the device is in startup, normal operation, or fault conditions. This parameter adaptation ensures that the comparison accuracy is maintained for each specific operating context, preventing degradation of measurement precision.
Data Source
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AI summary
The invention relates to the operation of an operating appliance for lighting devices, especially an electronic ballast for gas discharge lamps. The lighting device is controlled by the output of control signals of a digital control circuit (1). At least one analog measuring signal is returned to the digital control circuit (1), the at least one analog measuring signal being compared with an adjustable reference value in the digital control circuit (1), and the adjustable reference value being output by the central control unit (2) of the digital control circuit (1). The reference value depends on the actual operating condition of the operating appliance and/or the actual phase position of the at least one measuring signal.