阅读说明：本技术 一种模拟量输出型隔离式安全栅 (Analog output type isolated safety barrier ) 是由 李威 周虎 梁祥东 于 2021-08-07 设计创作，主要内容包括：一种模拟量输出型隔离式安全栅,包括光电耦合芯片U6,第一运算放大器U5,第二运算放大器U7,输入端子P3,输出端子P1,电源指示灯D18组成输出端防爆处理电路,所述输入端子P3输送信号到第一运算放大器U5,第一运算放大器U5控制光电耦合芯片U6的输入,光电耦合芯片U6控制第二运算放大器U7,第二运算放大器U7输送信号给输出端子P1,电源状态指示灯D17受非安端电源控制且常亮。本发明可以提供一种模拟量输出型隔离电路,同时进行防爆处理,限制模拟量信号从控制器输送到现场时数据线路上的能量,使之不足以引燃爆炸性混合物,同时对两个设备进行电气隔离,增强了工业控制网络的抗干扰性。(The utility model provides an analog output type isolated safety barrier, includes optoelectronic coupling chip U6, first operational amplifier U5, second operational amplifier U7, input terminal P3, output terminal P1, power indicator D18 constitutes the explosion-proof processing circuit of output, input terminal P3 transmission signal is to first operational amplifier U5, and first operational amplifier U5 controls the input of optoelectronic coupling chip U6, and optoelectronic coupling chip U6 controls second operational amplifier U7, and second operational amplifier U7 transmission signal is for output terminal P1, and power status indicator D17 is controlled by the power of the ann end and is bright normally. The invention can provide an analog quantity output type isolation circuit, simultaneously carries out explosion-proof treatment, limits the energy on a data line when an analog quantity signal is transmitted to the site from a controller, ensures that the analog quantity signal is not enough to ignite explosive mixtures, simultaneously carries out electrical isolation on two devices, and enhances the anti-interference performance of an industrial control network.)

1. The utility model provides an analog output type isolated safety barrier, includes optoelectronic coupling chip (U6), first operational amplifier (U5), second operational amplifier (U7), input terminal (P3), output terminal (P1), power indicator (D18) constitute the explosion-proof processing circuit of output, characterized in that input terminal (P3) conveying signal is to first operational amplifier (U5), the input of optoelectronic coupling chip (U6) is controlled to first operational amplifier (U5), optoelectronic coupling chip (U6) control second operational amplifier (U7), second operational amplifier (U7) conveying signal is for output terminal (P1), power status indicator (D17) is controlled and is normally bright by the power of the ann end.

2. An analog output type isolated safety barrier as claimed in claim 1, wherein the 2 nd pin of the input terminal (P1) is electrically connected to one end of a fuse F5, the 1 st pin of the input terminal (P1) is electrically connected to the non-intrinsic-safety-end power supply negative GND2 end, the other end of the fuse F5 is electrically connected to one end of a capacitor C35, one end of a resistor R31 and one end of a resistor R29, the other end of the capacitor C35 and the other end of a resistor R31 are electrically connected to the non-intrinsic-safety-end power supply negative GND2 end, the other end of the resistor R29 is electrically connected to one end of the capacitor C34 and the 3 rd pin of the first operational amplifier (U5), the other end of the capacitor C34 and the other end of the non-intrinsic-safety-end power supply negative GND2 end, the 2 nd pin of the operational amplifier (U5) is electrically connected to one end of a resistor R32, one end of a capacitor C36, one end of a capacitor C33 and the 4 th pin of a photoelectric coupler chip (U6), the other end of the resistor R32 is electrically connected to the other end of the capacitor C36 and the first operational amplifier (U5) is electrically connected to the 4 th pin of the operational amplifier (U5), The non-intrinsic safety end power supply negative pole GND2 end, the capacitor C33 other end is electrically connected with the 6 th pin of the first operational amplifier (U5) and the 2 nd pin of the photoelectric coupling chip (U6), the first operational amplifier (U5) 7 th pin is electrically connected with one end of the capacitor C32 and the 3 rd pin of the photoelectric coupling chip (U6), the capacitor C32 other end and the 1 st pin of the photoelectric coupling chip (U6) are electrically connected with the non-intrinsic safety end power supply negative pole GND2 end, one end of the resistor R38 is electrically connected with the non-intrinsic safety end power supply positive pole V2 end, the other end of the resistor R38 is electrically connected with the power supply state indicator lamp (D18) positive pole end, and the power supply state indicator lamp (D18) negative pole end is electrically connected with the non-intrinsic safety end power supply negative pole GND2 end.

3. The isolated safety grid according to claim 1, wherein the 6 th pin of the optoelectronic coupling chip (U6) is electrically connected to the positive terminal V10 of the power supply at the intrinsically safe terminal, the 5 th pin of the optoelectronic coupling chip (U6) is electrically connected to one terminal of the capacitor C37, one terminal of the resistor R33 and the 3 rd pin of the second operational amplifier (U7), the other terminal of the capacitor C37 is electrically connected to the negative terminal GND1 of the power supply at the intrinsically safe terminal, the other terminal of the resistor R33 is electrically connected to the tap terminal of the adjustable resistor R36 and one terminal of the adjustable resistor R36, the other terminal of the adjustable resistor R36 is electrically connected to the negative terminal GND1 of the power supply at the intrinsically safe terminal, the 4 th pin of the second operational amplifier (U7) is electrically connected to the negative terminal GND1 of the power supply at the intrinsically safe terminal, the 2 nd pin of the second operational amplifier (U7) is electrically connected to one terminal of the resistor R35, the other terminal R35 is electrically connected to one terminal R37, one terminal of the capacitor C38 and one terminal of the field effect transistor Q3, the other terminal of the resistor R37 and the source terminal 8653 are electrically connected to the negative terminal GND 8427, the 7 th pin of the second operational amplifier (U7) is electrically connected with the positive electrode terminal V10 of the intrinsic safety power supply, the 6 th pin of the second operational amplifier (U7) is electrically connected with one end of a resistor R30, the other end of the resistor R30 is electrically connected with one end of a resistor R34 and the gate terminal of a field-effect tube Q3, the other end of the resistor R34 is electrically connected with the negative electrode GND1 of the intrinsic safety power supply, the drain end of the field-effect tube Q3 is electrically connected with one end of a capacitor C40 and the 6 th pin of an output terminal (P1), and the other end of the capacitor C40 is electrically connected with the negative electrode GND1 of the intrinsic safety power supply.

4. An analog output type isolated safety barrier as claimed in claim 1, wherein said intrinsic safety terminal V1 is electrically connected to the positive terminal of diode D4, the negative terminal of diode D4 is electrically connected to one terminal of capacitor C8, one terminal of capacitor C9 and one terminal of resistor R8, the other terminals of capacitor C8 and capacitor C9 are electrically connected to the negative terminal GND1 of intrinsic safety terminal, the other terminal of resistor R8 is electrically connected to the negative terminal of zener diode D6 and one terminal of capacitor C10, the positive terminal of zener diode D6 is electrically connected to the other terminals of capacitor C10 and intrinsic safety terminal GND1, the positive terminal V1 of intrinsic safety terminal is electrically connected to the positive terminal of diode D5, the negative terminal of diode D5 is electrically connected to one terminal of resistor R9, the other terminal of resistor R9 is electrically connected to one terminal of capacitor C11 and one terminal of fuse F2, the other terminal of fuse F2 is electrically connected to the negative terminal of zener diode D7, the negative terminal of zener diode D8, the negative terminal of diode D9 and one terminal of resistor R10, One end of the resistor R11, the positive end of the Zener diode D7 is electrically connected with the positive end of the Zener diode D8, the positive end of the Zener diode D9, the other end of the capacitor C11, one end of the resistor R41 and the 6 th pin of the output terminal (P1), the other end of the resistor R10 is electrically connected with the other end of the resistor R11, one end of the resistor R12 and one end of the resistor R13, and the other end of the resistor R12 is electrically connected with the other end of the resistor R13, the other end of the resistor R41 and the 5 th pin of the output terminal (P1).

Technical Field

The invention relates to a signal isolation safety device, in particular to an analog output type isolation safety barrier which can perform signal isolation transmission and explosion-proof treatment by performing analog signal transmission between a controller and a field actuator, limiting energy on a transmission line, performing data transmission, automatic control and remote operation in a safe and controllable range and performing signal isolation transmission and explosion-proof treatment.

Background

With the continuous improvement of the industrial automation degree, the application of automatic control is higher and higher, and the analog quantity output is very common in a control system. For the control of some continuously variable physical variables (such as temperature, pressure, liquid level, flow rate, etc.) in nature, its indexes can be well expressed by analog quantity, for example, the control of the opening of a linear valve, the control of the rotation speed of a motor, the control of the level of liquid, etc. are analog quantity output signals. At present, in industrial areas such as coal, oil, natural gas and the like, transmitted analog output signals must be safe. The transmission of analog output signals directly on-site on lines without explosion-proof treatment may cause sparking, which is not allowed in explosive environments, and thus life and property safety cannot be guaranteed. And therefore need to limit the power of the analog devices. Ordinary analog output signals cannot be directly used in places with explosion risks, such as coal, petrochemical industry, natural gas and the like, and when analog output signals are transmitted in the fields, the danger that lines are ignited to ignite explosive combustibles exists.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an analog quantity output type isolated safety barrier which can perform analog quantity signal transmission between a controller and a field actuator, limit the energy on a transmission line, perform data transmission, automatic control and remote operation in a safe and controllable range, and perform signal isolated transmission and explosion-proof treatment.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an analog output type isolated safety barrier, includes optoelectronic coupling chip U6, first operational amplifier U5, second operational amplifier U7, input terminal P3, output terminal P1, power indicator D18 constitutes the explosion-proof processing circuit of output, input terminal P3 transmission signal is to first operational amplifier U5, and first operational amplifier U5 controls the input of optoelectronic coupling chip U6, and optoelectronic coupling chip U6 controls second operational amplifier U7, and second operational amplifier U7 transmission signal is for output terminal P1, and power status indicator D17 is controlled by the power of the ann end and is bright normally.

The invention has the advantages that the analog quantity output type isolation circuit can be provided, meanwhile, the explosion-proof treatment is carried out, the energy on the data line when the analog quantity signal is transmitted to the site from the controller is limited, so that the analog quantity signal is not enough to ignite explosive mixtures, meanwhile, the two devices are electrically isolated, and the anti-interference performance of an industrial control network is enhanced. The invention can be used for controlling the frequency converter of the oil pumping motor rotating speed, and when the frequency converter is connected with a non-explosion-proof PLC or other oil pumping controllers, the reliable communication guarantee can be realized by adding the circuit. The analog output signal of the controller is transmitted to the frequency converter in an isolated mode, meanwhile, explosion-proof processing is conducted, the analog signal of any path transmitted to the site by the controller is insufficient in energy on the circuit to ignite an explosive mixture, meanwhile, two devices are electrically isolated, and safety and reliability of industrial control are improved.

Drawings

The structure and characteristics of an analog output type isolated safety barrier of the present invention will be further described with reference to the accompanying drawings and embodiments, wherein:

fig. 1 is a circuit diagram of a first embodiment of the present invention.

Fig. 2 is a block diagram of a first embodiment of the present invention.

In the figure: u6. photoelectric coupling chip, U5. first operational amplifier, U7. second operational amplifier, P1 input terminal, P3 output terminal, and D18 power state indicator lamp.

Detailed Description

In the embodiment shown in fig. 1, an output end explosion-proof processing circuit, a photoelectric coupling chip (U6), a first operational amplifier (U5), a second operational amplifier (U7), an input terminal (P3), an output terminal (P1) and a power indicator (D18) are provided.

The invention relates to an analog quantity output type isolated safety barrier, which comprises a photoelectric coupling chip (U6), a first operational amplifier (U5), a second operational amplifier (U7), an input terminal (P3), an output terminal (P1) and a power indicator lamp (D18) which form an output end explosion-proof processing circuit, wherein the input terminal (P3) transmits a signal to the first operational amplifier (U5), the first operational amplifier (U5) controls the input of the photoelectric coupling chip (U6), the photoelectric coupling chip (U6) controls the second operational amplifier (U7), the second operational amplifier (U7) transmits a signal to the output terminal (P1), and the power indicator lamp (D17) is controlled by a non-safety end power supply and is normally on.

The analog quantity output type isolated safety grid is implemented by electrically connecting the 2 nd pin of an input terminal (P1) with one end of a fuse F5, electrically connecting the 1 st pin of the input terminal (P1) with the negative pole GND2 end of a non-intrinsic safety end power supply, electrically connecting the other end of the fuse F5 with one end of a capacitor C35, one end of a resistor R31 and one end of a resistor R29, electrically connecting the other end of a capacitor C35 and the other end of a resistor R31 with the negative pole GND2 end of the non-intrinsic safety end power supply, electrically connecting the other end of a resistor R29 with one end of a capacitor C34 and the 3 rd pin of a first operational amplifier (U5), electrically connecting the other end of a capacitor C34 with the negative pole GND2 end of the non-intrinsic safety end power supply, electrically connecting the 2 nd pin of the operational amplifier (U5) with one end of a resistor R32, one end of a capacitor C36, one end of a capacitor C33 and the 4 th pin of a photoelectric coupled chip (U6), electrically connecting the other end of a resistor R32 with the other end of a capacitor C36, the first operational amplifier (U5) and the negative pole 2, the other end of the capacitor C33 is electrically connected with the 6 th pin of a first operational amplifier (U5) and the 2 nd pin of a photoelectric coupling chip (U6), the 7 th pin of the first operational amplifier (U5) is electrically connected with one end of the capacitor C32 and the 3 rd pin of the photoelectric coupling chip (U6), the other end of the capacitor C32 is electrically connected with the 1 st pin of the photoelectric coupling chip (U6) to the end of a negative pole GND2 of a non-intrinsic safety end power supply, one end of the resistor R38 is electrically connected with the end of a positive pole V2 of the non-intrinsic safety end power supply, the other end of the resistor R38 is electrically connected with the positive pole end of a power state indicator lamp (D18), and the negative pole end of the power state indicator lamp (D18) is electrically connected with the end of the negative pole GND2 of the non-intrinsic safety end power supply.

The invention relates to an analog quantity output type isolated safety grid, wherein a pin 6 of a photoelectric coupling chip (U6) is electrically connected with a positive electrode end V10 of a local safety end power supply, a pin 5 of the photoelectric coupling chip (U6) is electrically connected with one end of a capacitor C37, one end of a resistor R33 and a pin 3 of a second operational amplifier (U7), the other end of the capacitor C37 is electrically connected with a negative electrode GND1 end of the local safety end power supply, the other end of a resistor R33 is electrically connected with a tap end of an adjustable resistor R36 and one end of the adjustable resistor R36, the other end of the adjustable resistor R36 is electrically connected with a negative electrode GND1 end of the local safety end power supply, a pin 4 of the second operational amplifier (U7) is electrically connected with a negative electrode GND1 end of the local safety end power supply, a pin 2 of the second operational amplifier (U7) is electrically connected with one end of a resistor R35, the other end of the resistor R35 is electrically connected with one end of a resistor R37, one end of a capacitor C38 and a source end of a field effect transistor Q3, the other end of the resistor R37 and the source terminal of the capacitor C38 are electrically connected with a negative electrode 1, the 7 th pin of the second operational amplifier (U7) is electrically connected with the positive electrode terminal V10 of the intrinsic safety power supply, the 6 th pin of the second operational amplifier (U7) is electrically connected with one end of a resistor R30, the other end of the resistor R30 is electrically connected with one end of a resistor R34 and the gate terminal of a field-effect tube Q3, the other end of the resistor R34 is electrically connected with the negative electrode GND1 of the intrinsic safety power supply, the drain end of the field-effect tube Q3 is electrically connected with one end of a capacitor C40 and the 6 th pin of an output terminal (P1), and the other end of the capacitor C40 is electrically connected with the negative electrode GND1 of the intrinsic safety power supply.

According to the analog quantity output type isolation safety barrier, an anode end V1 of a power supply at an intrinsic safety end is electrically connected with an anode end of a diode D4, a cathode end of the diode D4 is electrically connected with one end of a capacitor C8, one end of a capacitor C9 and one end of a resistor R8, the other end of the capacitor C8 and the other end of the capacitor C9 are electrically connected with a cathode GND1 end of the power supply at the intrinsic safety end, the other end of a resistor R8 is electrically connected with a cathode end of a voltage-regulator diode D6 and one end of a capacitor C10, an anode end of the voltage-regulator diode D6 is electrically connected with the other end of the capacitor C10 and the cathode GND1 end of the power supply at the intrinsic safety end, the anode end V1 of the power supply at the intrinsic safety end is electrically connected with an anode end of a diode D5, a cathode end of the diode D5 is electrically connected with one end of a resistor R9, the other end of a resistor R9 is electrically connected with one end of the capacitor C11 and one end of a fuse F2, the other end of the fuse F2 is electrically connected with a cathode end of the zener diode D7, a cathode end of the diode D7, a zener diode D8, a cathode end of the diode D8 and a resistor R10 are electrically connected with the cathode end of the diode D9, One end of the resistor R11, the positive end of the Zener diode D7 is electrically connected with the positive end of the Zener diode D8, the positive end of the Zener diode D9, the other end of the capacitor C11, one end of the resistor R41 and the 6 th pin of the output terminal (P1), the other end of the resistor R10 is electrically connected with the other end of the resistor R11, one end of the resistor R12 and one end of the resistor R13, and the other end of the resistor R12 is electrically connected with the other end of the resistor R13, the other end of the resistor R41 and the 5 th pin of the output terminal (P1).

The analog quantity output type isolated safety barrier is an analog quantity output type isolating circuit, and meanwhile, explosion-proof treatment is carried out, so that the energy on a data line when an analog quantity signal is transmitted to the field from a controller is limited, the explosive mixture cannot be ignited, meanwhile, two devices are electrically isolated, and the anti-interference performance of an industrial control network is enhanced. The invention can be used for controlling the frequency converter of the oil pumping motor, and when the frequency converter is connected with a non-explosion-proof PLC or other oil pumping controllers, reliable communication guarantee can be realized by adding the circuit. The analog output signal of the controller is transmitted to the frequency converter in an isolated mode, meanwhile, explosion-proof processing is conducted, the analog signal of any path transmitted to the site by the controller is insufficient in energy on the circuit to ignite an explosive mixture, meanwhile, two devices are electrically isolated, and safety and reliability of industrial control are improved.

The analog quantity output type isolated safety barrier can ensure that analog quantity signals of the controller are safely transmitted to a field actuator and are subjected to explosion-proof treatment, energy on any analog quantity signal line transmitted to the field by the controller is insufficient to ignite explosive mixtures, and meanwhile, two devices are electrically isolated, so that the safety and the reliability of industrial control are enhanced. For example: the frequency converter is used for controlling the rotating speed of the oil pumping motor, and when the frequency converter is connected with a non-explosion-proof PLC or other oil pumping controllers, reliable communication guarantee can be realized by adding the frequency converter. When receiving the analog quantity signal output by the controller, the actuating mechanisms of the field analog quantity signal type control carry out voltage limiting and current limiting energy control and electrical isolation on the circuit, thereby ensuring the reliability of the transmission circuit in the automatic control occasions with explosive factors, realizing automatic control and remote detection, and carrying out signal isolation transmission and explosion-proof treatment.

The invention has good effect.