CN201975775U - Surge protector of industrial control signal circuit - Google Patents
Surge protector of industrial control signal circuit Download PDFInfo
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- CN201975775U CN201975775U CN2011200010518U CN201120001051U CN201975775U CN 201975775 U CN201975775 U CN 201975775U CN 2011200010518 U CN2011200010518 U CN 2011200010518U CN 201120001051 U CN201120001051 U CN 201120001051U CN 201975775 U CN201975775 U CN 201975775U
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Abstract
The utility model relates to a surge protector of an industrial control signal circuit and belongs to the field of thunder and lightning science and technology. The surge protector comprises a protection circuit 1, a low-pass filter, a protection circuit 2, and a photoelectric isolation circuit in sequential connection, wherein the protection circuit 1 comprises a gas-discharge tube G1; the low-pass filter comprises four inductors L1, L2, L3, and L4, and four capacitors C1, C2, C3, and C4; the protection circuit 2 comprises four diodes D1, D2, D3, and D4; and the photoelectric isolation circuit mainly comprises two operational amplifiers A1 and A2 and three LEDs including an LED1, an LED2, and an LED3. The surge protector has simple structure, stable property, strong anti-interference ability, and wide application range.
Description
Technical field
The utility model relates to a kind of surge protector of industry control message circuit, belongs to thunder and lightning science and technology field.
Background technology
Along with the high speed development of modern electronic technology, the application of various electronic equipments and large scale integrated circuit more and more widely, computer and various microelectronic device become an indispensable part in the commercial Application.Because the microelectronic device operating voltage is low, power consumption is little, the overvoltage tolerance is low, so system is very responsive to the overvoltage in the signal.Overvoltage not only can cause the electronic apparatus system misoperation, can also cause the permanent damage of electronic equipment, thus the direct losses of causing and indirect loss.
In industry spot, come transmission signals with the electric current of simulating, because the current signal of simulation is also insensitive to the noise of small-signal.The electric current loop of 4～20mA is to represent zero-signal with 4mA, represents the full scale of signal with 20mA, and is lower than the warning that signal that 4mA is higher than 20mA is used for various faults.It is that sensing and measurement are used that the typical case of 4～20mA industry analog signal uses, there is the transducer of numerous species can be converted into the current signal of 4～20mA in industry spot, because the transmitter chip contains general functional circuit such as voltage drive source, current excitation stream, voltage stabilizing circuit, instrument amplifier etc., so can be converted into the signal of many transducers the signal of 4～20mA easily.
During industrial equipment work; because complex operating environment of living in; influence as the interference of electromagnetic field, Lightning Electromagnetic Pulse and electric spark; to induce overvoltage at the cable of transmission signals; make industrial control equipment produce misoperation, warning; serious situation may make industrial equipment shut down, and causes great economic loss.Particularly lightning overvoltage is done the time spent, and the signal processing circuit of industrial control equipment is damaged, and industrial equipment can't normally move, and causes huge direct and indirect economic loss.
The utility model content
When guaranteeing that various interference signals act on industrial equipment in the external world; industrial equipment can normally move; the utility model provides a kind of surge protector of industry control message circuit, can suppress the overvoltage that extraneous various factors produces, and guarantees that device security normally moves.
The utility model adopts following technical scheme for solving its technical problem:
A kind of surge protector of industry control message circuit, being linked in sequence by protective circuit 1, low pass filter, protective circuit 2 and photoelectric isolating circuit forms.
Described low pass filter is made up of four inductance and four electric capacity, and series circuit one end that inductance L 1 and inductance L 3 are formed is connected the input of capacitor C 1, and the other end is connected the input of capacitor C 2; Series circuit one end that inductance L 2 and inductance L 4 are formed is connected the output of capacitor C 1, and the other end is connected the output of capacitor C 2; Capacitor C 3 is connected with the input of capacitor C 2 with series circuit one end that capacitor C 4 is formed, and the other end is connected with the output of capacitor C 2.
Described protective circuit 2 is made up of four diodes; the negative electrode of diode D1 is connected with the negative electrode of diode D2; the anode of diode D3 is connected with the anode of diode D4, and the anode of diode D1 is connected with the negative electrode of diode D3, and the anode of diode D2 is connected with the negative electrode of diode D4.
The beneficial effects of the utility model are as follows:
1, in the surge protector design, is provided with between line-ground and line and protects, be i.e. the ability that the common mode and the differential mode overvoltage of thunder and lightning had inhibition.
2, line-ground discharge capacity is big, is 10kA to the maximum.
3, surge protector adopts low pass filter as decoupling component, can reduce the lightning wave steepness, improves and suppresses the circuit interference capability.
4, adopt the linear optical coupling device isolation between input and output, protect terminal equipment effectively.
5, the linearity is good, and circuit is simple, and is stable and reliable for performance, is widely used.
6, low-pass filter circuit has characteristics such as simple in structure, good wave filtering effect, reliability height.
Description of drawings
The functional-block diagram of Fig. 1 surge protector.
Fig. 2 (a) and Fig. 2 (b) have formed the surge protector circuit diagram.
The circuit diagram of Fig. 3 protective circuit 1.
Fig. 4 low-pass filter circuit figure.
The circuit diagram of Fig. 5 protective circuit 2.
The circuit diagram of Fig. 6 photoelectric isolating circuit.
Embodiment
Below in conjunction with accompanying drawing the invention is described in further details.
The surge protector theory diagram of industry control message circuit as shown in Figure 1.
The sensor signal of 4～20mA is through protective circuit 1; the lightning wave energy of macro-energy is discharged into the earth; deliver to low pass filter; the interference signal of filtering radio-frequency component; deliver to protective circuit 2 again, protective circuit 2 major functions are clamps between line, with the amplitude limitation of interference signal in certain voltage range; deliver to photoelectric isolating circuit by the signal of protective circuit 2 outputs signal is handled back output, deliver to industrial signal processor and handle again.The major function of the functional-block diagram each several part of surge protector is among Fig. 1: the major function of protective circuit 1 is that the lightning wave to macro-energy discharges over the ground, and with the amplitude limitation of the lightning overvoltage ripple on the circuit in certain scope.The major function of low pass filter has two: the one, lightning wave is equivalent to the decoupling component of surge protector, and play the function that reduces the lightning wave steepness; The 2nd, the interference high-frequency signal of small-signal is filtered out.The major function of protective circuit 2 is when the differential mode overvoltage occurring between two holding wires, realizes clamp function, and voltage between lines is limited in certain scope.The function of photoelectric isolating circuit is the electrical isolation that solves analog signal and acquisition process circuit effectively, prevents that overvoltage and interference signal directly are added to the acquisition process circuit, cause the damage of acquisition process circuit.
The electrical schematic diagram of industry control message line surge protector is shown in Fig. 2 (a) and Fig. 2 (b).
The analog current signal of 4～20mA; through the protective circuit that constitutes by gas discharge tube G1; the lightning wave energy of responding in the circuit is discharged over the ground; the signal of output is delivered to by four inductance L 1, L2, L3, L4 and four low pass filters that capacitor C 1, C2, C3 and C4 constitute; interference in the filtering circuit and noise signal; the current analog signal of output is added to the pressure limiting clamp circuit that is made of four diode D1, D2, D3 and D4, and signal between line is carried out clamp output.Signal by clamp circuit output is added to photoelectric isolating circuit, by photoelectric isolating circuit signal is handled, and delivers to the signal acquiring system of industrial equipment and handles.
The structure and the operation principle of industry control message line surge protector each several part circuit:
Low-pass filter circuit as shown in Figure 4.In order to improve inhibition, adopt multiple-stage filtering to disturbing.What this circuit constituted is a passive low-pass network.Wherein inductance L 1, inductance L 2 are two absolute coils on the same magnet ring, constitute the common mode inhibition inductance coil.When signal code flows through, can cancel each other in the magnetic field that is produced, and can not cause the saturated of magnetic core, thereby the inductance value of two coils is remained unchanged, and core material use permeability is 5000～8000 magnet ring.Inductance L 3, inductance L 4 are to be used for further suppressing the differential mode choke of differential mode noise, and the introducing of inductance L 3, inductance L 4 reduces the charging current of capacitor C 1, capacitor C 2, have reached the purpose that suppresses differential mode noise.On the signal line over the ground and the capacitor C 3 that connects, 4 pairs of common-mode noises of capacitor C play the bypass effect, in the circuit and connect capacitor C 1,2 pairs of differential mode noises of capacitor C play inhibitory action.The parameter of each element is among Fig. 4: C1=C2=1nF, L1=L2=10mH, L3=L4=10mH, C3=C4=4700pF.
Photoelectric isolating circuit as shown in Figure 6.
The linear optical coupling device is operated under the photoconductive pattern, and signal is the positive polarity input, positive polarity output.The size that resistance R 2 is regulated the input bias current of operational amplifier A 1 in the buffer circuit, 5 feedback effects of capacitor C, the interference signal in the filtering circuit simultaneously.Along with the increase of signal frequency, impedance will diminish, and primary current in the optocoupler increases, and it is big that gain becomes thereupon, thus the introducing of capacitor C 5 gain when the high frequency has certain influence to passage.The luminous intensity of resistance R 3 control LED plays a part certain to the gain of control channel.
The analog current signal of the course of work of circuit: 4～20mA is converted to voltage signal on sampling resistor R1, amplifying driven for emitting lights diode (LED) 1 through operational amplifier A 1 is light signal with electrical signal conversion, the light signal that receives photodiode LED3 reception is converted to the signal of telecommunication, constitutes the current amplifier output current signals through operational amplifier A 2.Change the parameter of circuit, make the size of output current the same with the input current signal amplitude.The part of reception diode LED2 absorbing light flux, thereby the Control current i1 that produces.This electric current is used for regulating the non-linear of compensation LED 1, guarantees that the electric current of circuit output is consistent with the size of current of input, in the circuit working process, makes output and is entered as linear relationship.The parameter of each element and model are among Fig. 6: Vc=+12V, and R2=100k Ω, R4=100k Ω, R3=500 Ω, linear optical coupling are HCNK200, A1, A2 are LM358, power supply employing ± 12V DC power supply.
Claims (3)
1. the surge protector of an industry control message circuit, it is characterized in that being linked in sequence by protective circuit 1, low pass filter, protective circuit 2 and photoelectric isolating circuit forms.
2. the surge protector of a kind of industry control message circuit according to claim 1, it is characterized in that described low pass filter is made up of four inductance L 1, L2, L3, L4 and four capacitor C 1, C2, C3, C4, series circuit one end that inductance L 1 and inductance L 3 are formed is connected the input of capacitor C 1, and the other end is connected the input of capacitor C 2; Series circuit one end that inductance L 2 and inductance L 4 are formed is connected the output of capacitor C 1, and the other end is connected the output of capacitor C 2; Capacitor C 3 is connected with the input of capacitor C 2 with series circuit one end that capacitor C 4 is formed, and the other end is connected with the output of capacitor C 2.
3. the surge protector of a kind of industry control message circuit according to claim 1; it is characterized in that described protective circuit 2 is made up of four diode D1, D2, D3, D4; the negative electrode of diode D1 is connected with the negative electrode of diode D2; the anode of diode D3 is connected with the anode of diode D4; the anode of diode D1 is connected with the negative electrode of diode D3, and the anode of diode D2 is connected with the negative electrode of diode D4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200010518U CN201975775U (en) | 2011-01-05 | 2011-01-05 | Surge protector of industrial control signal circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200010518U CN201975775U (en) | 2011-01-05 | 2011-01-05 | Surge protector of industrial control signal circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201975775U true CN201975775U (en) | 2011-09-14 |
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ID=44580873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200010518U Expired - Fee Related CN201975775U (en) | 2011-01-05 | 2011-01-05 | Surge protector of industrial control signal circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201975775U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354968A (en) * | 2011-10-12 | 2012-02-15 | 成都兴业雷安电子有限公司 | Surge protector with photoelectric isolator |
| CN105763029A (en) * | 2016-04-07 | 2016-07-13 | 无锡矽瑞微电子股份有限公司 | Overload over current protection anti-interference driving circuit |
| CN113804951A (en) * | 2021-09-13 | 2021-12-17 | 广东电网有限责任公司 | Live display device of circuit and live identification method of circuit |
-
2011
- 2011-01-05 CN CN2011200010518U patent/CN201975775U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354968A (en) * | 2011-10-12 | 2012-02-15 | 成都兴业雷安电子有限公司 | Surge protector with photoelectric isolator |
| CN105763029A (en) * | 2016-04-07 | 2016-07-13 | 无锡矽瑞微电子股份有限公司 | Overload over current protection anti-interference driving circuit |
| CN113804951A (en) * | 2021-09-13 | 2021-12-17 | 广东电网有限责任公司 | Live display device of circuit and live identification method of circuit |
| CN113804951B (en) * | 2021-09-13 | 2024-06-11 | 广东电网有限责任公司 | Live display device of circuit and live identification method of circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20130105 |