Dummy Load Circuit for Single Live Wire Switch Ghosting
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Solution Overview
Problem
Single live wire smart switches face challenges with high power consumption, ghosting, and flickering issues in dual wireless mode, and compatibility problems with various electrical loads, particularly due to inadequate current supply and zero-crossing detection limitations.
Innovation Solution
A dummy load circuit with a switch circuit and switch control circuit, utilizing a first resistor connected and disconnected based on voltage thresholds to manage power consumption and a purely resistive circuit for accurate zero-crossing detection, reducing power consumption and ensuring no ghosting in the power-off state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pure resistor is used as the dummy load, then compatibility with different load types is improved, but power consumption exceeds 8 W which is unacceptable
Solution Approach 1:
The patent applies the dynamics principle by making the dummy load circuit dynamically controllable through a switch. The switch is controlled by a control circuit that detects voltage thresholds to dynamically connect or disconnect the dummy load resistor based on system state (power-on/power-off), enabling adaptive power consumption management while maintaining load compatibility.
Solution Approach 2:
The patent applies parameter changes by modifying the resistance value of the dummy load based on system state. A first resistor is used during power-off state to provide ghosting prevention, and a second resistor with different resistance value is used during power-on state to maintain compatibility, thereby adapting the electrical parameters to different operational requirements.
2Reliability
If an X2 capacitor is used as the dummy load, then ghosting and flickering problems are solved, but the capacitance limit prevents sufficient current supply for dual wireless mode operation
Solution Approach 1:
The patent replaces the fixed capacitance parameter of X2 capacitor with variable resistance parameters. By using resistors with different resistance values that can be switched based on system state, the circuit can provide both the ghosting prevention function (when connected during power-off) and sufficient current supply capability (when connected during power-on with appropriate resistance value).
3Reliability
If the dummy load is connected in parallel with the electrical load, then ghosting is prevented, but power consumption increases significantly in the power-on state
Solution Approach 1:
The patent applies dynamics by implementing a switch-controlled dummy load circuit that changes its connection state dynamically. The control circuit monitors system state and connects the dummy load resistor only during power-off state to prevent ghosting, while disconnecting it during power-on state to minimize power consumption, thereby achieving both ghosting prevention and energy efficiency.
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
The solution significantly reduces power consumption, improves compatibility with different electrical loads, and provides accurate zero-crossing detection, addressing the ghosting and flickering issues while maintaining stable power take-off in both power-on and power-off states.
Implementation Method 1
the first resistor in the dummy load circuit is connected to the circuit of the system in a lower voltage range of each cycle of the mains electricity, and the first resistor in the dummy load circuit is disconnected in a higher voltage range of each cycle of the mains electricity
Implementation Method 2
the switch is controlled by the switch control device, and the first resistor in the dummy load circuit is connected to the circuit of the system in a lower voltage range of each cycle of the mains electricity, and the first resistor in the dummy load circuit is disconnected in a higher voltage range of each cycle of the mains electricity
Implementation Method 3
When the system is turned off, the first resistor of the dummy load circuit provides most of the power to the system, thereby avoiding the ghosting of the lamp load
Data Source
AI summary
The present invention relates to a dummy load circuit for a single live wire switch. This includes: a switch circuit—at least a first resistor and a switch are connected in the switch circuit, wherein the first resistor is connected to the switch, such that the first resistor is connected to the dummy load circuit through the switch; and a switch control circuit—the switch control circuit at least includes a switch control device, wherein the switch control device is connected to the switch to facilitate power-on/off control. The invention also relates to an electrical load with a dummy load circuit.