Controller and power fail safeguard method

Abstract

The embodiment of the invention discloses a controller and a power fail safeguard method. The controller comprises a system power source, a lithium battery, a power source management chip, a detection circuit, a volatile memory, a read-write non-volatile memory and a CPU (Central Processing Unit), wherein the input end of the power source management chip is connected with the system power source and the lithium battery respectively, and the detection circuit, the volatile memory, the read-write non-volatile memory and the CPU are respectively connected with the output end of the power source management chip; the CPU is used for responding interruption request signals emitted by the detection circuit, copying data in the volatile memory to the read-write non-volatile memory and closing the power source management chip, and when the system power source is electrified again and the system initialization is completed, the CPU is used for copying the data in the read-write non-volatile memory to the volatile memory, and at the moment, the CPU continues to operate at the moment of CPU power failure, thus after the system power source is power-off, the stored data is not lost under the condition that power-on time of the lithium battery is reduced, and the reliability of the power fail safeguard scheme is improved.

Description

technical field [0001] The invention relates to the technical field of automatic control, and more specifically, to a controller and a power-down protection method. Background technique [0002] The controller that stores the configuration information of the upper computer and the real-time operation information of the site is the core component of the automatic control system. In order to prevent data loss when the system power fails, it is necessary to provide power-down protection for the data stored in the controller. [0003] In the prior art, the power-down protection scheme mainly adopts the mode of "lithium battery + static random access memory SRAM". Operation information; after the system power supply is powered off, the system stops running, and the lithium battery supplies power to the SRAM to ensure that its data content is not lost; after the system power supply is powered on again, the system reads data from the SRAM. Resume operation at the node that was pow...

AI Technical Summary

Problems solved by technology

[0004] However, since the SRAM is a kind of volatile memory, and the power supply time of the lithium battery is limited, when the system power supply is powered off for a long time, it is easy to cause the power supply of the lithium battery to be exhausted or drop, thereby causing The data content in the SRAM is lost, reducing the reliability of the power-down protection scheme

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