Improved time relay

Abstract

The invention provides an improved time relay. The improved time relay. The improved time relay comprises a power supply circuit, a timing circuit, an output circuit, an action pattern setting circuit, a time delay specification setting circuit, a time delay range switching circuit and a time setting circuit; the time setting circuit comprises a potentiometer RP1 for obtaining a corresponding time ratio from a voltage division ratio; the two fixed ends of the potentiometer RP1 are connected to the power source and the ground, respectively, while the sliding end of the potentiometer RP1 is connected with the timing circuit; the timing circuit comprises an A / D converter, an internal clock, a data memory and an operational comparator; the input end of the A / D converter is connected with the sliding end of the potentiometer RP1; due to the adopted non-resistance-capacitance oscillatory setting, the voltage division ratio of the potentiometer directly corresponds to the timing time ratio, and therefore, the adverse effects of the discreteness of a resistance-capacitance piece on timing accuracy and consideration of both high and low ends that cannot be solved by an analog time relay in the past can be reduced, and the setting accuracy of full scale can be greatly improved to greatly facilitate factory adjustment and scale division during complete machine production.

Description

Technical field [0001] The invention relates to an improved time relay. Background technique [0002] ST3P time relay is manufactured by introducing a full set of technology from Fuji Electric Co., Ltd. of Japan. It has the characteristics of small size, wide delay range, and good reliability. It has been mass-produced and applied in China. It belongs to RC oscillation counting IC type time relay, ABCDEFG totals 7 Each delay specification requires 7 specifications of delay capacitors to achieve, the electronic component board cannot be universal, and the production efficiency is low. Need to manually adjust the trimming potentiometer to determine the delay accuracy, the consistency and reliability are poor. In order to adapt to the current development trend of electronic control relays, it is of great practical significance to redesign and upgrade the ST3P time relay. Summary of the invention [0003] In order to overcome the above technical shortcomings, the present invention p...

AI Technical Summary

Problems solved by technology

[0002] The ST3P time relay is manufactured by introducing a complete set of technology from Fuji Electric Co., Ltd., Japan. It has the characteristics of small size, wide delay range, and good reliability. A delay specification needs 7 delay capacitors to achieve, the electronic component board cannot be used universally, and the production efficiency is low

It is necessary to manually adjust the trimmer potentiometer to determine the delay accuracy, and the consistency and reliability are poor

Images