Low-Voltage Controller Dimming via Step Signal
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Solution Overview
Problem
Current low-voltage controllers (LVCs) in hospitals do not allow patients to dim lamps to intermediate light levels, limiting their ability to adjust lighting according to needs, despite being safe for use near liquids and physical abuse.
Innovation Solution
A low-voltage controller (LVC) configured to receive a low-voltage step signal from a momentary switch, allowing it to control high-voltage loads such as lamps, with a dimmer to set intensity levels and additional switch inputs/outputs for multiple load control, enabling dimming functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current LVCs are used to control high-voltage loads, then patient safety is ensured through low-voltage operation, but the ability to dim lamps to intermediate levels is not provided
Solution Approach 1:
The patent applies parameter changes by modifying the control signal parameters (pulse width modulation duty cycle, frequency) to achieve dimming effects. The LVC maintains low-voltage operation while varying these parameters to control the intensity of high-voltage loads, thus achieving intermediate lighting levels without compromising safety.
Solution Approach 2:
The patent implements dynamics by enabling the LVC to provide variable control signals that can adjust load intensity dynamically. The system transitions from static on/off control to dynamic dimming capability, allowing patients to adjust lighting levels according to their needs while maintaining safe low-voltage operation throughout.
2Adaptability or versatility
If LVCs are designed with additional switch inputs and load outputs for multiple loads, then versatility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the LVC with multiple switch inputs and load outputs that can be configured to control different types of loads (lamps, curtains, medical equipment). The same basic controller architecture handles various functions through programmable or switchable configurations, avoiding the need for separate dedicated controllers for each load type.
Solution Approach 2:
The patent implements segmentation by dividing the control system into independent input/output channels, where each switch input can be independently configured to control specific load outputs. This modular approach allows the controller to manage multiple loads without creating a monolithic complex system, as each channel operates independently.
Data Source
AI summary
A low-voltage controller (LVC) is configured to utilize a low-voltage signal to operate a high-voltage load, such as a lamp. The LVC is configured to receive a low-voltage step signal at a switch input. The LVC has a line input for connection to a source of power at a line voltage and a load output for connection to a first load, and a dimmer for setting an intensity of the first load. Subsequent step signals alter the intensity of the load. A method for low-voltage control of the load is provided. A method includes the steps of receiving a first switch signal at a switch input of an LVC; setting a lamp to a first intensity; receiving a second switch signal at the switch input; and setting the lamp to a second intensity.