Dual-computer hot-switching controller based on cpld

Abstract

The invention provides a CPLD-based double-computer thermal-switching controller which comprises a CPLD main control chip, a key-vibration elimination chip, a plurality of four-channel alternative switch chips, a plurality of alternative switch chips, Darlington transistors and optocouplers. The key-vibration elimination chip outputs switching key control signals subjected to vibration elimination to the CPLD main control chip. A host and a standby unit provide TTL control signals for the CPLD chip through the optocouplers. The CPLD chip outputs TTL control status signals to the host and the standby unit through the Darlington transistors respectively. Serial interface signals with the same serial interface number in the host and the standby unit input the same four-channel alternative switch. D / A signals with the same D / A number in the host and the standby unit input the same alternative switch. The CPLD chip outputs control signals to all the four-channel alternative switches and all the alternative switches. By the adoption of the CPLD chip, the design cost can be greatly lowered, the design structure is simple, and the control rate is greatly increased; moreover, the four-channel alternative switch chips and the single-channel alternative switch chips are adopted to achieve switching of the serial interface signals and switching of the D / A signals respectively.

Description

technical field [0001] The invention relates to the technical field of signal heat switch controllers, in particular to a CPLD-based dual-machine heat switch controller. Background technique [0002] The antenna control unit (ACU for short) is the control core of the antenna control subsystem. Usually, two sets of ACU are provided to the user, one is the master and the other is the backup. When the master fails, the backup needs to be replaced. The standby machine is usually a "cold backup", that is, the standby machine does not supply power and cannot immediately participate in antenna control. The fatal disadvantage of the traditional "cold backup" is that the replacement time is long and the replacement process is cumbersome. Due to these shortcomings, it may cause significant losses to the antenna control system. At present, in order to solve the problem of "cold backup", the main solution is to switch between the main machine and the standby machine by switching the co...

AI Technical Summary

Problems solved by technology

At present, there are various switching controllers in the market, such as KVM switcher, VGA switcher, HDMI switcher, video matrix switcher, etc., because ACU has many external interfaces, which mainly include serial communication ports (RS- 422, RS-485), D / A output and other external interfaces, these switches currently on the market are not suitable for switching the data communication of the ACU external interface

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