A power-down detection delay circuit for engine control system

Abstract

The invention provides a power failure detection delay circuit for an engine control system. The power failure detection delay circuit comprises a voltage reduction and energy storage unit, a voltagedivision unit, a comparison unit, an isolation detection unit and a current reverse-pouring prevention unit; the voltage reduction and energy storage unit is used for charging itself by utilizing a power supply and supplying power when the voltage reduction and energy storage unit is powered down; the voltage division unit is used for reducing the output voltage of the voltage reduction and energystorage unit and the voltage of the power supply and then outputting the voltages to the comparison unit; the comparison unit compares the received two voltage magnitudes and outputs a comparison result to the isolation detection unit; the isolation detection unit is used for isolating and transmitting the comparison result to a microcontroller, and provides a high-level signal or a low-level signal to the input end of the microcontroller for providing a basis for carrying out power failure judgment on the basis of rising edges for the microcontroller; and the current reverse-pouring prevention unit is used for preventing the power supply from being in reversed connection and preventing the voltage reduction and energy storage unit from reversely pouring to the power supply in power down.According to the power failure detection delay circuit, the circuit is simple, the power supply power down can be detected, and delayed power supply can be carried out in a short time.

Description

technical field [0001] The invention relates to the technical field of battery power protection, in particular to a power-down detection delay circuit for an engine control system. Background technique [0002] The modern missile servo system requires high reliability in the application environment. In some special cases (such as the position sensor and the output shaft are not synchronously rotated, and there is a certain proportional relationship), the current position information needs to be stored when the power is off, and the power-off detection The delay circuit becomes a crucial part of the control circuit of the engine control system. [0003] In a special solid engine control system, the flow switch valve is driven by a motor and a reducer with a small reduction ratio. Due to space constraints, the position sensor (resolver) cannot be directly installed on the output shaft, but is installed at the output end of the servo motor. There is a certain proportional rela...

AI Technical Summary

Problems solved by technology

If the zero adjustment work is performed before each power-on, the work is cumbersome and dangerous; if the system returns to the electrical and mechanical zero before each power-off, in special cases, when the power is cut off halfway, it still needs to be re-zeroed , this method cannot be promoted and applied to the project

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