A power supply control circuit and method for a civil aircraft display controller

Abstract

The invention provides a power supply control circuit and method for a civil aircraft display controller. After the display controller is powered on, a power supply conversion module outputs a power supply signal to an FPGA and a related configuration circuit. After a power on key on a light guide plate is pressed, a power on key signal is output. After the signal passes through a signal isolationacquisition circuit, the FPGA scans a keyboard and calculates the key value. If a key is the power on key, the key time is timed, and after the time reaches a fixed value, a power on signal is output. The power on signal passes through an opto-isolator, and then is output to the power supply conversion module. The power supply conversion module inputs the power supply signal to a PMIC power supply circuit and an interface circuit. The PMIC power supply circuit inputs a GPU power supply signal to a GPU and the related configuration circuit. The display controller is powered on to enter a normal operation mode. According to the power supply control circuit and method for the civil aircraft display controller, the power supply control circuit is effectively prevented from being damaged by abnormal electrical stress; the power consumption and volume of the system are reduced; and the high security level requirement of a civil aircraft is satisfied.

Description

technical field [0001] The invention belongs to the technical field of display driving in civil airborne display equipment, and relates to a power supply control circuit and method for a display controller of a civil aircraft. Background technique [0002] The display controller realizes the control operation of itself and its related cross-linking equipment through the buttons on the light guide plate. Traditional display controller power control circuits include: light guide plate, power module, optocoupler, single-chip microcomputer, CPU, GPU and DC / DC power supply. The key signal is input to the single-chip microcomputer through the optocoupler, and the single-chip microcomputer scans the key input periodically, adopts the progressive scanning method, and obtains the key value of the key through delay anti-shake. The single-chip microcomputer must scan continuously every cycle, and at the same time use the CPU and GPU at the same time, and the GPU does not use low power...

AI Technical Summary

Problems solved by technology

The single-chip microcomputer must scan continuously every cycle, and at the same time use the CPU and GPU at the same time, and the GPU does not use low power consumption mode, and the power consumption of the display is relatively large

At the same time, the instantaneous high current generated by abnormal conditions such as lightning strikes will directly break down the optocoupler, and the single-chip microcomputer cannot collect the key signal, which will cause the display controller to fail to power on.

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