CN2135214Y - High-power time-delay switching - Google Patents

Abstract

The utility model discloses a high-power time-delay switch which is composed of a trigger circuit, a timing switch, a thyristor and a rectifying circuit. The high-power time-delay switch is characterized in that the DC terminal of the rectifying circuit is connected with the timing switch, the AC terminal of the rectifying circuit is connected with the trigger circuit, and the G electrode and the K electrode of the thyristor are connected in parallel to be connect with an AC power supply.

Description

High-power time-delay switching

The utility model relates to a kind of electronic large power delay switch.

Present small-sized timing switch all is to be used to control low-power load basically, if be used to control big load power consumption equipment, generally realizes by driving auxiliary relay or contactor, so exist the more high shortcoming of complex structure cost.

The purpose of this utility model is a kind of delay switch that can control high power load with small-sized timing switch, and simple in structure, cost is lower.

The utility model adopts electronic circuit fully, by timing switch, and rectification circuit, circuits for triggering, controllable silicon and high power load constitute.Rectification in the circuit partly, its direct current two ends and timing switch connect, and two exchange end respectively with circuits for triggering, the controllable silicon K utmost point, the G utmost point are connected to the AC power end after connecting.The realization of this delay switch has been to utilize dexterously bidirectional triode thyristor control utmost point G and the parameter characteristic that sends the two-sided little resistance conducting of utmost point K.Small-power timing switch load capacity (≤0.8A) much larger than (the corresponding to phase place requirement of variation of≤needs 0.1A) and the variation of small-power timing switch load current potential and high-power control switch control utmost point G current potential of high-power control switch trigger current.Thereby realized that the load circuit of small-power timing switch and high-power control switch trigger the loop circuit that two combine into one fully.This is line construction cleverly, can guarantee the reliably working of small-power timing switch, and the specified trigger current of high-power noncontacting switch can be provided again.

Fig. 1 is an electrical schematic diagram of the present utility model.

Known to Fig. 1, the utility model is made up of small-power timing switch 1 and high-power control switch, wherein bridge rectifier, circuits for triggering 2, the G common circuit that extremely two-way little resistance conducting partly is above-mentioned two circuit to K.When the small-power timing switch is in on-state, bridge rectifier U _2A=2.1v is so trigger the pressure drop U in loop _AN=220V, so controllable silicon T realizes two-way admittance, then the pressure drop at load Z two ends is 220V, i.e. equipment operation.When timing one arrives, when the small-power timing switch is in off state, bridge rectifier U _LA=220V, this moment, indicator light D was shinny, triggered loop U _AU≈ 0V so bidirectional triode thyristor T ends, makes the pressure drop U at controllable silicon T two ends _CK≈ 220V, then the voltage at load Z two ends becomes 0V, i.e. equipment downtime.

The utility model compared with prior art has the advantages such as volume is little, in light weight, simple in structure, load-bearing capacity is big.

Claims (1)

1, a kind of high-power delay switch, by timing switch, circuits for triggering, controllable silicon and rectification circuit constitute, the dc terminal that it is characterized in that rectification circuit is connected with timing switch, and it exchanges end and is connected AC power with circuits for triggering, silicon controlled G, the K utmost point after connecting.

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