Isolated Floor Lamp Control Circuit for Safe LED Dimming
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Solution Overview
Problem
Existing floor lamps with AC input bulbs pose a risk of electric shock during installation or use due to high-voltage components, and there is a need for a safer installation method that allows control of LED bulb brightness and color temperature.
Innovation Solution
A floor lamp control circuit utilizing a 12-36V isolation adapter, DC-DC step-down circuit, and H-bridge control LED brightness & color temperature circuit, with a CPU controlling the H-bridge through PWM ports, enabling safe low-voltage operation and two-wire control of LED bulbs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AC input bulbs with high voltage are directly installed in lamp holders, then the lamp can provide sufficient brightness and power, but people may touch the high-voltage part during installation or use, causing fatal injuries
Solution Approach 1:
The patent introduces a control board as an intermediary device between the power source and the bulb. The control board converts AC power to low-voltage DC power (12V or 24V), allowing the bulb to operate at safe low voltage while still providing sufficient brightness through LED technology. This mediator eliminates the direct high-voltage connection that causes electric shock risk.
Solution Approach 2:
The patent changes the operating voltage parameter from high voltage (AC 100-220V) to low voltage (DC 12V or 24V). By transforming the electrical parameters through the control board, the system maintains lighting functionality while eliminating the harmful high-voltage characteristic that poses electric shock danger to users.
2Ease of operation
If a control board with multiple functions is introduced to enable low-voltage operation and LED control, then safety is improved and LED brightness/color temperature control is achieved, but the device complexity increases
Solution Approach 1:
The control board is designed to perform multiple functions: power conversion from AC to DC, voltage regulation to 12V or 24V, PWM dimming control, and color temperature adjustment for LED bulbs. By consolidating these functions into a single universal control board, the system achieves ease of operation without proportionally increasing overall device complexity.
Solution Approach 2:
The patent replaces manual mechanical control (direct high-voltage switching) with electronic control through PWM (Pulse Width Modulation) signals. The CPU generates PWM signals to control LED brightness and color temperature electronically, providing precise control while reducing mechanical complexity and improving safety.
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
Enables safe installation and operation of low-voltage LED bulbs with controlled brightness and color temperature, eliminating high-voltage shocks and simplifying installation, while allowing multiple styles of bulbs to be used with a common method.
Implementation Method 1
a 12-36V isolation adapter, the input end of the 12-36V isolation adapter is connected to the mains supply, the output end of the 12-36V isolation adapter is connected to the input end of the DC-DC step-down circuit
Implementation Method 2
a DC-DC step-down circuit and an H-bridge control LED brightness & color temperature circuit; the input end of the 12-36V isolation adapter is connected to the mains supply, the output end of the 12-36V isolation adapter is connected to the input end of the DC-DC step-down circuit
Implementation Method 3
the output end of the DC-DC step-down circuit is connected to the CPU; the two PWM control ports of the CPU are connected to the two PWM ports of the H-bridge control LED brightness & color temperature circuit
Implementation Method 4
H-bridge control LED brightness & color temperature circuit; the output end of the LED brightness & color temperature circuit is connected in parallel with more than one LED lamp array
Data Source
AI summary
The present utility model discloses a floor lamp control circuit, which comprises a central processing unit (CPU), a 12-36V isolation adapter, a DC-DC step-down circuit and an H-bridge control LED brightness & color temperature circuit; the input end of the 12-36V isolation adapter is connected to the mains supply, the output end of the 12-36V isolation adapter is connected to the input end of the DC-DC step-down circuit, and the output end of the DC-DC step-down circuit is connected to the CPU; the two PWM control ports of the CPU are connected to the two PWM ports of the H-bridge control LED brightness & color temperature circuit, and the conduction of the H-bridge control LED brightness & color temperature circuit is controlled through two PWM control ports; the output end of the LED brightness & color temperature circuit is connected in parallel with more than one LED lamp array. The circuit of this structure can help to improve the safety.