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Two-wire load control device

A load control, line-type technology, applied to lighting devices, lamp circuit layout, light sources, etc., can solve problems such as electric shock for users

Inactive Publication Date: 2014-11-12
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the user replaces the burnt-out bulb while the load is kept on like this, the user may get an electric shock because the terminals of the lighting fixture are applied with voltage

Method used

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Examples

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Embodiment Construction

[0026] A two-wire load control device according to an embodiment of the present invention will be described with reference to the drawings. figure 1 A basic block configuration of the two-wire load control device 1 according to the present embodiment is shown, figure 2 A specific circuit configuration is shown. The two-wire load control device 1 includes two input terminals 11a and 11b respectively connected to the AC power source 2 and the load 3, and a relay type switching element 12 and a current transformer 13 connected between the two input terminals 11a and 11b. series circuit. The relay switching element 12 is a switching element including mechanically driven contacts such as a latch relay. In addition, a first bidirectional semiconductor switching element 32 such as a triac is connected in parallel with the relay type switching element 12, and a triac photoelectric switch is connected to the gate of the first bidirectional semiconductor switching element 32, for exa...

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Abstract

Provided is a two-wire load control device that uses a relay-type switch element, wherein, if a bulb burns out and so on, bulb replacement can be carried out with the relay-type switch element having been reliably switched to a non-conductive state. The two-wire load control device is equipped with: a series circuit of a relay-type switch element (12) and a current converter (13) connected between an alternating-current power source (2) and a load (3); an ON power source unit (17) that is connected to a secondary side of the current converter (13), and outputs direct-current power when the relay-type switch element (12) is in a conductive state; an ON power-source power detection unit (31) that detects a physical quantity indicating direct-current power that is output from the ON power source unit (17); and a control unit (20) that controls the conduction and non-conduction of the relay-type switch element (12). If it is determined that the direct-current power output from the ON power source unit (17) is less than a predetermined threshold power due to a bulb burning out for example, the relay-type switch element (12) is switched to a non-conductive state.

Description

technical field [0001] The invention relates to a two-wire load control device for controlling the on and off of loads such as lighting devices. Background technique [0002] Conventionally, a load control device using a semiconductor switching element such as a triac is known. In the load control device using such a semiconductor switching element, the two-wire type load control device is connected in series between the AC power supply and the load, so the wiring work is simple. Conversely, it is necessary to secure power for driving semiconductor switching elements and control circuits (CPU, etc.) even when the load is off. Therefore, when a rectifier circuit is connected in parallel to the semiconductor switching element, even when the load is turned off, a weak current to the extent that the load does not turn on or malfunction actually flows through the load, and the rectified current is charged into the snubber capacitor (buffer capacitor) to ensure the power supply ...

Claims

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Application Information

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IPC IPC(8): H05B37/02H02M7/12
CPCH05B33/0815H05B33/0845H05B37/02H05B47/10H05B45/397Y02B20/30
Inventor 斋藤裕东浜弘忠谷利阳子丰田一郎
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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