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Two-wire switching device

A switching device and main switch technology, which is applied to electronic switches, lighting devices, components of lighting devices, etc., can solve the problems such as the inability to fully suppress the sudden change of switching voltage and the lack of solutions.

Inactive Publication Date: 2008-04-23
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a semiconductor switching element generally has a PN junction element formed of a silicon material having a high withstand voltage, the voltage drop can only be suppressed to a limited extent
Therefore, even when a low-dropout semiconductor switching element is used, sudden changes in the switching voltage cannot be sufficiently suppressed
Thus, the problems discussed above are not resolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0064] The two-wire switchgear 1 according to the first embodiment of the present invention is similar to the two-wire switchgear 100 shown in FIG. The installed switch box extends the two house wires from the commercial power supply to the commercial power supply and the load.

[0065] As shown in Fig. 1, the two-wire switching device 1 includes: a main switching unit 2 composed of a triac, wherein a load LF and an AC power supply are connected between two ends of the main switching unit 2 such that one end of the main switching unit 2 Connect to load LF via AC power supply AC; one end of the AC power supply AC). Here, the rectification unit 3 is used to apply a gate voltage to the gate terminal of the main switching unit 2 when the output terminal (DC output terminal) of the rectification unit 3 is short-circuited.

[0066] In addition, the two-wire switching device 1 also includes: a first power supply unit 4, used to generate DC power based on the output of the rectifier...

no. 2 example

[0091] As shown in FIG. 4 , the two-wire switching device 10 according to the second embodiment of the present invention has the same structure as the first embodiment except that a smoothing capacitor C8 is connected between the DC output terminals of the rectifying unit 3 . Since parts of the two-wire switching device 10 other than the smoothing capacitor C8 are the same as those of the first embodiment, the same parts will be denoted by the same reference numerals, and description thereof will be omitted.

[0092] According to the two-wire switching device 10 of the second embodiment, the same performance as that of the first embodiment is obtained, and in addition, the output of the rectifying unit 3 is smoothed by the smoothing capacitor C8. Therefore, sudden changes in the switching voltage when the DC output terminals of the rectifying unit 3 are short-circuited can be mitigated, thereby achieving further noise reduction.

no. 3 example

[0094] As shown in FIG. 5 , the structure of the two-wire switching device 11 according to the third embodiment of the present invention differs from that of the first embodiment mainly in that a sub switching unit 80 is provided instead of the sub switching unit 8 . Since most of the two-wire switching device 11 is configured the same as the first embodiment except for the sub-switch unit 80, the same parts will be denoted by the same reference numerals, and description thereof will be omitted.

[0095] Compared with the two-wire switch unit 1 of the first embodiment provided with the sub-switch unit 8 composed of a triac, the two-wire switch unit 11 of the present embodiment is provided with a sub-switch composed of a field effect transistor (FET). Unit 80.

[0096]Furthermore, in the two-wire switching unit 1 of the first embodiment, the anode of the Zener diode ZD2 is connected to the gate terminal of the sub-switching unit 8, and the gate of the sub-switching unit 8 is dr...

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Abstract

A two-wire switching device includes a primary switching unit; a rectifying unit; a first power supply unit for generating a DC power while a power is stopped being supplied from the AC power supply to the load; a second power supply unit for generating a DC power while the power is supplied from the AC power supply to the load; a stabilizing unit; a control unit for starting an operation of the second power supply unit when an electric power is supplied from the AC power supply to the load; a secondary switching unit for short-circuiting the output terminals of the rectifying unit while the second power unit is operated; and at least one auxiliary switching unit. The auxiliary switching unit is on during a time interval from output terminals of the rectifying unit being short-circuited to the primary switching unit being turned on.

Description

technical field [0001] The invention relates to a two-wire switching device. Background technique [0002] In recent years, electrically operated wiring devices are becoming more and more common. In connection with this, triacs (TRIACs) or thyristors used as non-contact switching devices are widely used as switching elements of electronic switching devices. [0003] However, in a two-wire type switching device (i.e., a two-wire switching device), in order to save wiring, its switching element is connected between each end of the series-connected AC power supply and the load (i.e., the load is connected between both ends of the switching element , one of which is connected to the load via the AC power supply). Since in this configuration the power cable cannot be inserted into the switchgear alone, securing the power supply to the switchgear becomes problematic. [0004] In order to solve the above-mentioned problems, a two-wire switching device 100 with the circuit struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/72
CPCY02B70/3283Y02B20/42Y04S20/246Y02B90/228Y04S20/18G05F1/445F21V23/04Y02B20/40Y02B70/30Y02B90/20Y04S20/00
Inventor 后藤洁东浜弘忠
Owner MATSUSHITA ELECTRIC WORKS LTD
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