Power supply on-off time sequence control circuit and control method

Abstract

The invention discloses a power supply on-off time sequence control circuit and a control method. The control circuit comprises a rectification and filtering circuit, a DC step-down circuit, a voltage division circuit, a thermistor, a relay, a first switch tube, a voltage division time delay circuit and a second switch tube. The control circuit can output three kinds of different voltage signals, and the three kinds of voltage signals can be powered on or off according to a preset time sequence. Therefore, the control circuit can simultaneously realize control for a power-on time sequence and a power-off time sequence of different power supplies of an internal chip of equipment, thereby ensuring the running reliability of the equipment and the chip, and prolonging the service life of the equipment and the chip. In addition, the time sequence control circuit disclosed by the invention is simple in circuit structure, low in manufacturing cost and simple in working procedure, thereby being suitable for large-area popularization.

Description

technical field [0001] The present invention relates to the technical field of power supply intelligent control, and more specifically, relates to a power-off sequence control circuit and control method on power supply. Background technique [0002] With the rapid development of electronic technology, DSP (Digital Signal Processing, digital signal processor), CPU (Central Processing Unit, central processing unit), large-scale integrated circuits, etc. be widely used. With the development of chips, the power supply structure is also diversified based on considerations of reliability, stability, and cost. Under this development trend, the electronic chips used in the equipment are also diverse, and the requirements for the power supply of these chips are becoming more and more complex. For equipment powered by multiple power sources, different chips in the equipment or different modules of the same chip There are strict requirements on the power-on sequence of multiple power...

AI Technical Summary

Problems solved by technology

Under this development trend, the electronic chips used in the equipment are also diverse, and the requirements for the power supply of these chips are becoming more and more complex. For equipment powered by multiple power sources, different chips in the equipment or different modules of the same chip There are strict requirements on the power-on sequence of multiple power supplies, and some even have requirements on the power-off sequence. If the power-on or power-off sequence is improper, it will not only affect the reliability of the chip and equipment, but may even cause permanent damage to the chip.

[0003] At present, most of the commonly used timing control circuits are implemented by a special timing control chip. Although the timing control chip can control the timing of power-on and power-off, the chip has high manufacturing costs and complicated processes, and is not suitable for large areas. Promotion

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