Dummy load circuit and electrical load for single live wire switch

Patent metadata

Field	Value
Publication number	US-11219106-B2
Application number	US-202016798282-A
Country	US
Kind code	B2
Filing date	Feb 21, 2020
Priority date	Jul 31, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

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.

First claim

What is claimed is:

1. A dummy load circuit for a single live wire switch, the dummy load circuit comprising:
a switch circuit—at least a first resistor and a switch are connected in the switch circuit, such that the first resistor is connected to the dummy load circuit through the switch;
a switch control circuit—the switch control circuit at least includes a switch control device that is connected to the switch to facilitate power-on/off control; and
a purely resistive circuit for providing a purely resistive path for the single live wire switch to assist in zero-crossing detection; said purely resistive circuit includes at least one other resistor with a voltage proportional to a threshold of the switch; and the purely resistive circuit is connected to the switch control device such that the switch control device operates in accordance with the voltage of the other resistor,
wherein said switch is connected when the voltage of the dummy load circuit rises from zero to a first threshold, and the switch control device causes the switch to disconnect when the voltage continues to rise to a second threshold; the said switch control device causes the switch to be connected when the voltage of the dummy load circuit drops from a high voltage to a third threshold, and the switch autonomously disconnects when the voltage continues to drop to a fourth threshold.

2. The dummy load circuit of claim 1 , wherein a rectifier circuit is further connected between an input terminal of the dummy load circuit and the switch circuit and switch control circuit.

3. The dummy load circuit of claim 2 , wherein said rectifier circuit comprises a bridge rectifier.

4. The dummy load circuit of claim 2 , wherein said rectifier circuit comprises a diode.

5. The dummy load circuit of claim 1 , wherein a clamping circuit is further connected between an input terminal of the dummy load circuit and the switch circuit and switch control circuit.

6. The dummy load circuit of claim 1 , wherein the dummy load circuit is connected in parallel with the electrical load of the single live wire switch.

7. An electrical load having a dummy load circuit of claim 1 .

8. The electrical load of claim 7 , wherein said electrical load is an LED light.

Assignees

• Consumer Lighting Us Llc
• Savant Tech Llc

Inventors

• Chen Weihu
• Xing Dong
• Wang Aijun
• Wang Zhiyong
• Hu Jinpeng

Classifications

• Y02B20/30

  Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] · CPC title

• H03K17/687 Primary

  the devices being field-effect transistors · CPC title

• H05B45/10

  Controlling the intensity of the light · CPC title

• H05B45/3725

  Switched mode power supply [SMPS] · CPC title

• H05B45/3575 Primary

  by means of dummy loads or bleeder circuits, e.g. for dimmers · CPC title