阅读说明：本技术 一种有源和无源融合检测的馈电状态检测方法 (Feed state detection method for active and passive fusion detection ) 是由 吴银成 秦玉忠 黄春 李一文 孙柳军 张鑫烨 佘影 罗明华 方崇全 秦伟 朱兴林 于 2021-08-16 设计创作，主要内容包括：本发明涉及一种有源和无源融合检测的馈电状态检测方法,属于电子技术领域。将IN1、IN2两端作为输入信号,均为1500V以下的交流电压的有源信号,或为只有通/断状态的无源触点信号；运放A1和A2型号相同,光耦U1、U2、U3型号相同,MCU为单片机,双向瞬态抑制二极管TVS1～TVS4型号相同,分别保护直流电源VDC和运放A1、A2。本发明提出通过检测矿用馈电开关辅助触点的通断状态间接检测煤矿井下动力设备是否有电的无源检测方法的同时,在一台传感器内同时融合了有源检测方法和无源检测方法,使一台传感器能适用于煤矿井下全部电压等级。(The invention relates to a feed state detection method for active and passive fusion detection, and belongs to the technical field of electronics. Taking two ends of IN1 and IN2 as input signals, wherein the input signals are active signals of alternating voltage below 1500V or passive contact signals only IN an on/off state; the operational amplifier A1 and the operational amplifier A2 are the same in model, the optocouplers U1, U2 and U3 are the same in model, the MCU is a single chip microcomputer, the bidirectional transient suppression diodes TVS 1-TVS 4 are the same in model, and the direct-current power supply VDC and the operational amplifier A1 and A2 are protected respectively. The invention provides a passive detection method for indirectly detecting whether power equipment in the underground coal mine is electrified or not by detecting the on-off state of the auxiliary contact of the feed switch for the mine, and simultaneously integrates an active detection method and a passive detection method in one sensor, so that one sensor can be suitable for all voltage levels in the underground coal mine.)

1. A feed state detection method for active and passive fusion detection is characterized in that: taking two ends of IN1 and IN2 as input signals, wherein the input signals are active signals of alternating voltage below 1500V or passive contact signals only IN an on/off state;

the resistor R2 is R4, R5, R7, R10, R12;

the resistors R1 ═ R3, R6 ═ R11, R8 < R13;

the resistance R9 — R14 is a resistance smaller than the resistance of R1;

the operational amplifier A1 and the operational amplifier A2 are the same in model, the optocouplers U1, U2 and U3 are the same in model, the MCU is a single chip microcomputer, the bidirectional transient suppression diodes TVS 1-TVS 4 are the same in model, and the direct-current power supply VDC and the operational amplifier A1 and A2 are protected respectively;

when an active voltage signal is selected to be accessed, the optocoupler U1 is controlled to be in a conducting state by the singlechip MCU, namely, the +/-12V power supply voltage is in short circuit before entering a detection circuit, and a detected signal enters the detection circuit; the detection circuit performs voltage reduction on a detected signal through voltage division resistors (R5 and R6) and then enters an operational amplifier to form a differential amplification circuit, and negative feedback is formed through a resistor R8 to increase differential mode gain and reduce common mode interference; when voltages are applied to two ends of IN1 and IN2 and are higher than 100V, the operational amplifier A1 outputs high level, the optocoupler U2 is conducted, and an active detection signal sent to the singlechip MCU is low level; when no voltage exists at the two ends of IN1 and IN2 or the voltage is lower than 50V, the operational amplifier A1 outputs low level, the optocoupler U2 is cut off, and the active detection signal sent to the singlechip MCU is high level;

when a passive contact signal is selected to be accessed, the optocoupler U1 is controlled to be in a cut-off state by the singlechip MCU, namely, the plus or minus 12V power supply voltage enters the detection circuit; the +12V is connected to the + reference end of the operational amplifier A2 through a voltage division circuit consisting of resistors R1, R2, R10 and R11, and the-12V is connected to the-reference end of the operational amplifier A2; when the two ends of IN1 and IN2 are disconnected, the operational amplifier A2 outputs high level, the optocoupler U3 is connected, and an active detection signal sent to the singlechip MCU is low level; when the two ends of IN1 and IN2 are connected, the +, -reference ends of the operational amplifier A2 are short-circuited, the differential pressure is zero, the operational amplifier A2 outputs low level, the optocoupler U3 is cut off, and the active detection signal sent to the MCU is high level.

2. The method for detecting the feeding state of the active and passive fusion detection as claimed in claim 1, wherein: resistors R2, R4, R5, R7, R10 and R12 in the circuit are megaohm resistors;

the resistors R1, R3, R6, R11, R8 and R13 are all kiloohm resistors;

the resistors R9 and R14 are kilo-ohm resistors.

Technical Field

The invention belongs to the technical field of electronics, and relates to a feed state detection method for active and passive fusion detection.

Background

When the gas concentration in the underground coal mine exceeds a specified value or the wind stops, the power equipment in the relevant area must be immediately powered off. This is the basic function of colliery gas monitored control system, therefore detects colliery power equipment's feed state in the pit becomes necessary.

The power supply of the underground coal mine power equipment is usually provided through an explosion-proof feed switch, namely, the power supply or the non-power supply at the output end of the feed switch can represent the power supply or the non-power supply of the corresponding power equipment. Similarly, the power equipment can be controlled to be powered on or powered off by controlling the feed switch to be switched on or switched off. The feeder switches of power equipment in a certain area are generally arranged in a centralized manner in a power distribution chamber adjacent to the area, and the method for detecting whether the output ends of the feeder switches are electrified or not has the advantages of less wiring, convenience in operation and the like, and is a commonly adopted mode in the underground coal mine at present.

As for the feed state detection, a method of detecting the voltage at the output terminal of the feed switch (active detection method) and a method of detecting the on/off state of the auxiliary contact of the feed switch (passive detection method) are commonly used at present. The active detection method is generally suitable for 1140V and below voltage levels such as 660V, 380V, 127V and the like. The passive detection method is used for 3300V and above voltage grades, such as 6KV and 10 KV. This is because there are many safety protection regulations in high-voltage electrical apparatus, it is inconvenient to adopt the low-cost scheme to measure the voltage directly, and turn on or off state of the auxiliary contact of the high-voltage feed switch of detection, judge whether the feed switch has already supplied power to the power equipment indirectly.

Through inquiry, the prior patent technology about the detection of the feed state under the coal mine only has a few patents about active detection methods, and has no patent technology about passive detection methods. Obviously, in the prior art, two methods, namely active detection and passive detection, are split and are respectively realized on two different sensors, which brings trouble to a certain degree for practical application.

Disclosure of Invention

In view of the above, the present invention provides a feeding state detection method for active and passive fusion detection.

In order to achieve the purpose, the invention provides the following technical scheme:

a feed state detection method for active and passive fusion detection is characterized IN that two ends of IN1 and IN2 are used as input signals, and are both active signals of alternating voltage below 1500V or passive contact signals only IN an on/off state;

the resistor R2 is R4, R5, R7, R10, R12;

the resistors R1 ═ R3, R6 ═ R11, R8 < R13;

the resistance R9 — R14 is a resistance smaller than the resistance of R1;

the operational amplifier A1 and the operational amplifier A2 are the same in model, the optocouplers U1, U2 and U3 are the same in model, the MCU is a single chip microcomputer, the bidirectional transient suppression diodes TVS 1-TVS 4 are the same in model, and the direct-current power supply VDC and the operational amplifier A1 and A2 are protected respectively;

when an active voltage signal is selected to be accessed, the optocoupler U1 is controlled to be in a conducting state by the singlechip MCU, namely, the +/-12V power supply voltage is in short circuit before entering a detection circuit, and a detected signal enters the detection circuit; the detection circuit performs voltage reduction on a detected signal through voltage division resistors (R5 and R6) and then enters an operational amplifier to form a differential amplification circuit, and negative feedback is formed through a resistor R8 to increase differential mode gain and reduce common mode interference; when voltages are applied to two ends of IN1 and IN2 and are higher than 100V, the operational amplifier A1 outputs high level, the optocoupler U2 is conducted, and an active detection signal sent to the singlechip MCU is low level; when no voltage exists at the two ends of IN1 and IN2 or the voltage is lower than 50V, the operational amplifier A1 outputs low level, the optocoupler U2 is cut off, and the active detection signal sent to the singlechip MCU is high level;

when a passive contact signal is selected to be accessed, the optocoupler U1 is controlled to be in a cut-off state by the singlechip MCU, namely, the plus or minus 12V power supply voltage enters the detection circuit; the +12V is connected to the + reference end of the operational amplifier A2 through a voltage division circuit consisting of resistors R1, R2, R10 and R11, and the-12V is connected to the-reference end of the operational amplifier A2; when the two ends of IN1 and IN2 are disconnected, the operational amplifier A2 outputs high level, the optocoupler U3 is connected, and an active detection signal sent to the singlechip MCU is low level; when the two ends of IN1 and IN2 are connected, the +, -reference ends of the operational amplifier A2 are short-circuited, the differential pressure is zero, the operational amplifier A2 outputs low level, the optocoupler U3 is cut off, and the active detection signal sent to the MCU is high level.

Optionally, the resistors R2, R4, R5, R7, R10 and R12 in the circuit are all megaohm resistors;

the resistors R1, R3, R6, R11, R8 and R13 are all kiloohm resistors;

the resistors R9 and R14 are kilo-ohm resistors.

The invention has the beneficial effects that:

(1) the invention provides a passive detection method for indirectly detecting whether power equipment in the underground coal mine is electrified or not by detecting the on-off state of the auxiliary contact of the feed switch for the mine, and simultaneously integrates an active detection method and a passive detection method in one sensor, so that one sensor can be suitable for all voltage levels in the underground coal mine.

(2) In the invention, different feed sensors are not required to be selected for various voltage levels from low voltage to high voltage under the coal mine, so that the feed state sensor is simple and convenient to select; due to the single model, the stock quantity of spare parts can be obviously reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a feed state detection method for active and passive fusion detection.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

As shown in fig. 1. The input signals are provided at both ends of IN1 and IN2, and may be an ac voltage (active signal) of 1500V or less, or may be a passive contact signal having only an on/off state. In the circuit, a resistor R2, R4, R5, R7, R10 and R12 has a large resistance in mega ohm; the resistance R1 is R3, R6 is R11, R8 is less than R13, and the resistance is lower in kiloohm level; r9 is a kiloohm resistor with a smaller resistance value R14. The operational amplifier A1 and the operational amplifier A2 are the same in model, the optocouplers U1, U2 and U3 are the same in model, the MCU is a single chip microcomputer, the bidirectional transient suppression diodes TVS 1-TVS 4 are the same in model, and the two are respectively used for protecting a direct current power supply VDC and the operational amplifier A1 and A2.

When an active voltage signal is selected to be accessed, the optocoupler U1 is controlled to be in a conducting state by the singlechip MCU, namely, the +/-12V power voltage is in short circuit before entering the detection circuit, and a detected signal enters the detection circuit. The detection circuit performs voltage reduction on a detected signal through voltage division resistors (R5 and R6) and then enters an operational amplifier to form a differential amplification circuit, and negative feedback is formed through a resistor R8 to increase differential mode gain and reduce common mode interference. When voltages are arranged at two ends of IN1 and IN2 and are higher (higher than 100V), the operational amplifier A1 outputs high level, the optocoupler U2 is conducted, and an active detection signal sent to the singlechip MCU is low level; when no voltage or low voltage (lower than 50V) exists at the two ends of IN1 and IN2, the operational amplifier A1 outputs low level, the optical coupler U2 is cut off, and the active detection signal sent to the MCU is high level.

When a passive contact signal is selected to be accessed, the optocoupler U1 is controlled to be in a cut-off state by the singlechip MCU, namely, the +/-12V power voltage enters the detection circuit. The +12V is connected to the + reference end of the operational amplifier A2 through a voltage division circuit consisting of resistors R1, R2, R10 and R11, and the-12V is connected to the-reference end of the operational amplifier A2. When the two ends of IN1 and IN2 are disconnected, the operational amplifier A2 outputs high level, the optocoupler U3 is connected, and an active detection signal sent to the singlechip MCU is low level; when the two ends of IN1 and IN2 are connected, the +, -reference ends of the operational amplifier A2 are short-circuited, the differential pressure is zero, the operational amplifier A2 outputs low level, the optocoupler U3 is cut off, and the active detection signal sent to the MCU is high level.

As shown IN fig. 1, no matter whether the active voltage signal or the passive contact signal is present at both ends of IN1 and IN2, the two detection loops a1 and a2 are both IN working state, but because R8 < R13, the amplification factors of the two detection loops are different, that is, the amplification factor of the detection loop a1 is low and the amplification factor of the detection loop a2 is high, so that the two loops output different high and low level signals when the active signal and the passive signal are respectively switched IN. The specific operating conditions are shown in table 1.

TABLE 1 fusion detection loop working state table

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.