CN-122026893-A - Improved structure of discrete quantity signal power-on self-checking circuit

CN122026893ACN 122026893 ACN122026893 ACN 122026893ACN-122026893-A

Abstract

The invention discloses an improved structure of a discrete quantity signal power-on self-checking circuit, which comprises an optocoupler, a first MOS tube and a second MOS tube, wherein BIT signals are input to the source side of the optocoupler, excitation signals or output ground signals are output from the output ends of the first MOS tube and the second MOS tube, seven pins of the optocoupler are directly grounded GND_BIT through a resistor R3, six pins of the optocoupler are connected with VDD_BIT serving as a discrete quantity signal excitation source, when the power-on self-checking BIT signals are input into low level, the optocoupler is conducted, the grid electrode of the first MOS tube is grounded and conducted to output excitation signals for self-checking or the grid electrode of the second MOS tube is connected with a power supply and conducted to output ground signals for self-checking.

Inventors

MA LIANJIE
TIAN SONG
ZHANG HONGXUAN
YANG XIUKUN
LUO ZHENHUA

Assignees

贵阳航空电机有限公司

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (4)

1. The improved structure of the discrete quantity signal power-on self-checking circuit is characterized by comprising an optocoupler, a first MOS tube and a second MOS tube, wherein a BIT signal is input to the source side of the optocoupler, the eight pins of the optocoupler are connected with the grid electrode of the first MOS tube, the five pins of the optocoupler are connected with the grid electrode of the second MOS tube, The output ends of the first MOS tube and the second MOS tube output excitation signals or output ground signals BIT_Signal_1-BIT_Signal_10, the output ends of the first MOS tube and the second MOS tube are connected with diodes for isolating signals with different discrete quantities, Seven pins of the optocoupler are directly grounded to GND_BIT through a resistor R3, six pins of the optocoupler are connected to VDD_BIT serving as a discrete signal excitation source, when a power-on self-test BIT signal is input into a low level, the optocoupler is conducted, the grid electrode of the first MOS tube is grounded and conducted to output an excitation signal for self-test, or the grid electrode of the second MOS tube is connected to a power supply and conducted to output a ground signal for self-test.
2. The improved structure of a discrete magnitude signal power-on self-checking circuit according to claim 1, wherein the first MOS tube is a P-channel field effect tube, a resistor R1 is connected between a grid electrode and a drain electrode of the first MOS tube, and a common end of the drain electrode of the first MOS tube and the resistor R1 is connected with VDD_BIT.
3. The improved structure of a discrete magnitude signal power-on self-checking circuit according to claim 1, wherein the second MOS tube is an N-channel field effect tube, a resistor R5 is connected between the grid electrode of the second MOS tube and the optocoupler, and a resistor R6 is connected between the source electrode and the grid electrode of the second MOS tube.
4. The improved structure of a discrete magnitude signal power-on self-checking circuit according to claim 1, wherein two pins of the optocoupler are connected with a working voltage VDD through a resistor R2, three pins of the optocoupler are connected with the working voltage VDD through a resistor R4, and the input current of the optocoupler is 5-20mA when the optocoupler is conducted.

Description

Improved structure of discrete quantity signal power-on self-checking circuit Technical Field The invention relates to the technical field of discrete magnitude signal power-on self-checking circuits, in particular to an improved structure of a discrete magnitude signal power-on self-checking circuit. Background With the deep development of aviation full-electric, the control logic of an onboard system is various and complex, the design of onboard equipment is complex, the onboard equipment often contains a plurality of discrete quantity signals, partial signals can not be periodically detected and can only be subjected to self-detection during power-on, a common discrete quantity power-on self-detection circuit is usually formed by using a plurality of analog switch chips or a plurality of photoelectric coupler chips and the like, the aim of injecting and exciting different discrete quantity signals is fulfilled, the cost is relatively high, the number of channels is limited, and the I/O interface of the control chip is occupied, so that the improved structure of the discrete quantity signal power-on self-detection circuit is provided. Disclosure of Invention The invention aims to provide an improved structure of a discrete quantity signal power-on self-checking circuit, which aims to solve the problems of relatively high cost and limited channel number of the existing power-on self-checking circuit in the background technology. In order to achieve the aim, the invention provides the technical scheme that the improved structure of the discrete quantity signal power-on self-checking circuit comprises an optocoupler, a first MOS tube and a second MOS tube, wherein a BIT signal is input to the source side of the optocoupler, the eight pins of the optocoupler are connected with the grid electrode of the first MOS tube, the five pins of the optocoupler are connected with the grid electrode of the second MOS tube, The output ends of the first MOS tube and the second MOS tube output excitation signals or output ground signals BIT_Signal_1-BIT_Signal_10, the output ends of the first MOS tube and the second MOS tube are connected with diodes for isolating signals with different discrete quantities, Seven pins of the optocoupler are directly grounded to GND_BIT through a resistor R3, six pins of the optocoupler are connected to VDD_BIT serving as a discrete signal excitation source, when a power-on self-test BIT signal is input to a low level, the optocoupler is conducted, the grid electrode of the first MOS tube is grounded and conducted to output an excitation signal for self-test, or the grid electrode of the second MOS tube is connected to a power supply and conducted to output a ground signal for self-test. Preferably, the first MOS transistor is a P-channel field effect transistor, a resistor R1 is connected between a gate and a drain of the first MOS transistor, and a common terminal of the drain of the first MOS transistor and the resistor R1 is connected to vdd_bit. Preferably, the second MOS transistor is an N-channel field effect transistor, a resistor R5 is connected between the gate of the second MOS transistor and the optocoupler, and a resistor R6 is connected between the source of the second MOS transistor and the gate. Preferably, two pins of the optocoupler are connected with the working voltage VDD through a resistor R2, three pins of the optocoupler are connected with the working voltage VDD through a resistor R4, and the input current is 5-20mA when the optocoupler is turned on. The beneficial effects of the invention are as follows: The circuit has simple structure, adopts the first MOS tube, the second MOS tube, the optocoupler and the diode device which are common and conventional and have low cost, can carry out power-on self-test on discrete quantity signals with more numbers and no time sequence requirement, has more excitation self-test channels, reduces the cost of the power-on self-test circuit of the discrete quantity signals, and is suitable for the power-on self-test scene of the discrete quantity signals required by aviation airborne equipment. Drawings FIG. 1 is a power-on self-test circuit diagram of the present invention. In the figure, the MOS transistor comprises an optocoupler 1, a first MOS transistor 2, a second MOS transistor 3 and a diode 4. Detailed Description The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Referring to fig. 1, the invention provides an improved structure of a self-checking circuit for power-on of discrete quantity signals, w