CN-122026867-A - Comparator low level delay alarm circuit

Abstract

The invention discloses a low-level delay alarm circuit of a comparator, which comprises a filter circuit, a voltage dividing circuit, a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a V_IN voltage signal through the filter circuit, the output end of the first comparator is connected with a MOS tube, the drain electrode of the MOS tube is respectively connected with a voltage dividing resistor R6 and a voltage dividing resistor R7, and the output end of the voltage dividing resistor R7 is connected with a first charging capacitor and a second charging capacitor through a quick discharging circuit.

Inventors

• YANG XIUKUN
• CHEN ZHUOHUI
• TIAN SONG
• LUO ZHENHUA
• QIAN HONG

Assignees

• 贵阳航空电机有限公司

Dates

Publication Date

20260512

Application Date

20251226

Claims (4)

1. 1. The low-level delay alarm circuit of the comparator is characterized by comprising a filter circuit, a voltage dividing circuit, a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a V_IN voltage signal through the filter circuit, the non-inverting input end of the first comparator is connected with a voltage source through the voltage dividing circuit, the output end of the first comparator is connected with a MOS tube, the drain electrode of the MOS tube is respectively connected with a voltage dividing resistor R6 and a voltage dividing resistor R7, one end of the voltage dividing resistor R6 is connected with a resistor R4, one end of the resistor R4 is connected with the output end of the first comparator, a node A is arranged between the resistor R4 and the grid electrode of the MOS tube, a node B is arranged between the voltage dividing resistor R6 and the voltage dividing resistor R7, The output end of the divider resistor R7 is connected with a first charging capacitor and a second charging capacitor through a quick bleeder circuit, a node C is arranged between the first charging capacitor and the second charging capacitor, one end of the second charging capacitor is connected with the in-phase input end of the second comparator, and the inverting input end of the second comparator is connected with a resistor R11 and a resistor R12.
2. 2. The low-level delay alarm circuit of claim 1, wherein the reference voltage of the inverting input end of the first comparator is 6.92V, the reference voltage of the inverting input end of the second comparator is 10.59V, when the V_IN voltage signal exceeds the reference voltage by 6.92V, the first comparator outputs a high-level signal, the MOS tube is conducted, the B voltage is pulled down, the C point fails to charge, the second comparator outputs a low-level Fault-OUT signal, when the V_IN voltage signal is lower than the reference voltage by 6.92V, the first comparator outputs a low-level signal, the MOS tube is cut off, the first charging capacitor and the second charging capacitor are IN a charging state until the voltages of the first charging capacitor and the second charging capacitor exceed the reference voltage of the second comparator, and the second comparator outputs a high-level Fault-OUT signal.
3. 3. The low-level delay alarm circuit of the comparator according to claim 1, wherein the filter circuit is composed of a resistor R3 and a capacitor C2, and the voltage dividing circuit is composed of a resistor R1 and a resistor R2 which are connected in parallel.
4. 4. The low-level delay alarm circuit of the comparator according to claim 1, wherein the fast bleeder circuit is composed of a resistor R10, a diode D3, a resistor R7, a resistor R8 and a resistor R9, and is used for bleeding the voltage of the first charging capacitor or the second charging capacitor.

Description

Comparator low level delay alarm circuit Technical Field The invention relates to the technical field of low-level delay alarm circuits, in particular to a comparator low-level delay alarm circuit. Background In the electrified surge of aviation equipment, all-electric, multi-electric and electric aircrafts rapidly develop, the design of aviation airborne equipment also becomes complex and various, in the output detection of the airborne equipment, the gradual reduction of normal output high level is frequently encountered, even no output condition exists, the delayed fault warning for the abnormal condition is extremely important, and the short peak interference can be avoided in the delay, so that in order to monitor the state and timely perform fault warning, a comparator low-level delayed warning circuit is provided. Disclosure of Invention The invention aims to provide a low-level delay alarm circuit of a comparator, which is used for solving the problem that the delay alarm circuit of the prior airborne equipment provided in the background art cannot monitor the real-time state and alarm faults. IN order to achieve the aim, the invention provides the technical scheme that the low-level delay alarm circuit of the comparator comprises a filter circuit, a voltage dividing circuit, a first comparator and a second comparator, wherein the inverting input end of the first comparator is connected with a V_IN voltage signal through the filter circuit, the non-inverting input end of the first comparator is connected with a voltage source through the voltage dividing circuit, the output end of the first comparator is connected with an MOS tube, the drain electrode of the MOS tube is respectively connected with a voltage dividing resistor R6 and a voltage dividing resistor R7, one end of the voltage dividing resistor R6 is connected with a resistor R4, one end of the resistor R4 is connected with the output end of the first comparator, a node A is arranged between the resistor R4 and the grid electrode of the MOS tube, a node B is arranged between the voltage dividing resistor R6 and the voltage dividing resistor R7, The output end of the divider resistor R7 is connected with a first charging capacitor and a second charging capacitor through a quick bleeder circuit, a node C is arranged between the first charging capacitor and the second charging capacitor, one end of the second charging capacitor is connected with the in-phase input end of the second comparator, and the inverting input end of the second comparator is connected with a resistor R11 and a resistor R12. Further, the reference voltage of the inverting input end of the first comparator is 6.92V, the reference voltage of the inverting input end of the second comparator is 10.59V, when the V_IN voltage signal exceeds the reference voltage of 6.92V, the first comparator outputs a high-level signal, the MOS tube is conducted, the B voltage is pulled down, the C point fails to charge, the second comparator outputs a low-level Fault-OUT signal, when the V_IN voltage signal is lower than the reference voltage of 6.92V, the first comparator outputs a low-level signal, the MOS tube is cut off, the first charging capacitor and the second charging capacitor are IN a charging state until the voltages of the first charging capacitor and the second charging capacitor exceed the reference voltage of the second comparator, and the second comparator outputs a high-level Fault-OUT signal. Furthermore, the filter circuit is composed of a resistor R3 and a capacitor C2, and the voltage dividing circuit is formed by connecting a resistor R1 and a resistor R2 in parallel. Further, the fast bleeder circuit is composed of a resistor R10, a diode D3, a resistor R7, a resistor R8 and a resistor R9, and is used for bleeding the voltage of the first charging capacitor or the second charging capacitor. The invention has the advantages that when the high-level signal of the airborne equipment is converted into the low level, the low-level signal is acquired through the comparator, the high-level alarm signal is output outwards in a delayed mode, the invention is suitable for the scene of the low-level signal delayed output fault alarm function, the delayed fault alarm can be carried out on the abnormal reduction of the high-level output of the airborne equipment, the health monitoring and the reliability work of the equipment are ensured, the abnormal fault alarm accuracy of the output signal of the airborne equipment of an aviation is improved, and other monitoring circuits needing to carry out low-level delayed fault alarm can be popularized. Drawings Fig. 1 is a schematic diagram of the present invention. In the figure, 1, a filter circuit, 2, a voltage dividing circuit, 3, a first comparator, 4, an MOS tube, 5, a first charging capacitor, 6, a second charging capacitor, and 7, a second comparator. Detailed Description The following description of the embodiments of the present