A time-delay power-off switch device

Abstract

Disclosed is an off-delay switching device. The off-delay switching device is characterized by comprising a live wire input and a null wire input, a live wire is connected with a rectifying and voltage-stabilizing circuit after being in series connection with a self-locking button switch, the rectifying and voltage-stabilizing circuit supplies power to a delay control IC (integrated circuit), the self-locking button switch is provided with an electromagnetic mechanism capable of driving the self-locking button switch to act, the electromagnetic mechanism is connected with the live wire input and the null wire input after being in series connection with a thyristor, and a gate of the thyristor is electrically connected with a triggering pin of the delay control IC. The off-delay switching device has the advantages that the electromagnetic mechanism capable of controlling the self-locking button switch to act is arranged inside the self-locking button switch, and when the circuit is switched on by the self-locking button switch, after countdown of the IC is controlled to be completed, reset off of the self-locking button switch can be achieved by energizing of the electromagnetic mechanism, so that switch-off of a power source of an electric appliance is achieved; the off-delay switching device integrates the self-locking button switch with a timing circuit, thereby being high in timing precision, high in breaking current and voltage and the like.

Description

technical field [0001] The invention relates to a switch control circuit, in particular to a time-delayed power-off switch device. Background technique [0002] Currently on the market, most of the control circuits that require delay control use mechanical timing units or digital timing units, such as 555 timers. In particular, the digital timing unit composed of single-chip microcomputer or programmable controller is widely used in various precise timing control circuits because of its accurate timing and convenient setting of timing time. However, these mechanical timing units or digital timing units with long time delays are more suitable for long time delay control circuits requiring high timing accuracy due to their complex structure and high cost. A delay circuit with a short delay time is neither economical, affordable, nor necessary. [0003] At the same time, in the existing delay control equipment, a switch is required to trigger the entire mechanical timing equi...

AI Technical Summary

Problems solved by technology

However, the existing mechanical timekeeping accuracy is poor, but it has a high current and voltage breaking capacity

Although the time control of the electronic timing circuit is accurate, its current and voltage segmentation ability is low, and it often needs relays and other relay equipment to complete the work requirements of large current and high voltage.

In addition, in the existing electronic timing circuit, once the timing circuit is started, if the timing needs to be interrupted or switched to manual operation, a reset operation switch needs to be equipped in the circuit or the user directly disconnects the power supply, which is very troublesome to operate.

In addition, in the work of the electronic timing system, the user cannot know the working state of the circuit by operating the switch, so it is necessary to install indicator lights and other equipment in the circuit, resulting in complex circuits, high production costs, and high system failure rates. Existing time-delay switching equipment for further improvement

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