CN116526845A - Vibration sensor type isolation safety grid - Google Patents
Vibration sensor type isolation safety grid Download PDFInfo
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- CN116526845A CN116526845A CN202310426183.2A CN202310426183A CN116526845A CN 116526845 A CN116526845 A CN 116526845A CN 202310426183 A CN202310426183 A CN 202310426183A CN 116526845 A CN116526845 A CN 116526845A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
Abstract
The invention discloses a vibration sensor type isolation safety grating, wherein a power supply area circuit is electrically connected with a dangerous area circuit, and the power supply area circuit supplies power to the dangerous area circuit by adopting an isolation transformer; the dangerous area circuit is respectively and electrically connected with the safe area circuit and the vibration sensor, and is used for supplying power to the vibration sensor and supplying power to the safe area circuit through the isolation transformer; the vibration sensor outputs voltage signals which are sequentially output to an external control system after passing through the dangerous area circuit, the isolation transformer and the safe area circuit. The invention provides a vibration sensor type isolation safety barrier, which can ensure that voltage signals of field devices are safely transmitted to a control system and are subjected to explosion-proof treatment, energy on a line is insufficient to ignite an explosive mixture, and meanwhile, the devices are electrically isolated, so that the safety and reliability of industrial control are enhanced. In addition, the method has the advantages of low power consumption, high precision and small phase difference before and after transmission.
Description
Technical Field
The invention belongs to the field of signal isolation, and particularly relates to a vibration sensor type isolation safety grid.
Background
Along with the continuous improvement of industrial automation degree, the vibration detection system of motors such as compressors, blowers, turbines, water pumps and the like needs to be more intelligent, the detection system converts the vibration frequency of the motors into voltage signals through vibration sensors, and then the voltage signals are transmitted to a control system to monitor whether the motor works abnormally or not. If in industrial areas of coal, oil, gas etc., the voltage signal transmitted between the vibration sensor and the control system must be intrinsically safe. The direct transmission of voltage signals on lines without explosion-proof treatment in the field may cause the condition of ignition, and the life and property safety cannot be guaranteed, which is not allowed in an explosive environment, so that the energy of the voltage signal transmission needs to be limited.
The prior art scheme is realized by a chip and software technical scheme, the overall scheme has higher material cost, more production procedures and higher failure rate than possible occurrence; the power consumption is relatively high during static and full-load operation; the anti-jamming capability is weak, and common mode interference is easy to generate error codes.
Disclosure of Invention
The invention aims to provide a vibration sensor type isolation safety grid so as to solve the problems in the prior art.
In order to solve the problems, the technical scheme of the invention is as follows:
a vibration sensor type isolation safety barrier electrically connected between a vibration sensor and an external control system, comprising: a power supply area circuit, a dangerous area circuit and a safe area circuit;
the power supply area circuit is electrically connected with the dangerous area circuit, and the power supply area circuit supplies power to the dangerous area circuit by adopting an isolation transformer;
the dangerous area circuit is respectively and electrically connected with the safe area circuit and the vibration sensor, and is used for supplying power to the vibration sensor and supplying power to the safe area circuit through the isolation transformer;
the vibration sensor outputs voltage signals which are sequentially output to an external control system after passing through the dangerous area circuit, the isolation transformer and the safe area circuit.
Specifically, the power supply area circuit comprises a port protection sub-circuit, a first current limiter sub-circuit, a Buck sub-circuit and a modulation sub-circuit;
the input end of the port protection subcircuit is connected with an external power supply and used for protecting the power supply area circuit;
the input end of the first current limiter circuit is electrically connected with the output end of the port protection subcircuit and is used for limiting the input current;
the input end of the Buck sub-circuit is electrically connected with the output end of the first current limiter circuit and is used for converting external current into a VDD power supply with required voltage;
the input end of the modulation sub-circuit is electrically connected with the output end of the Buck sub-circuit and is used for receiving the VDD power supply, generating square wave signals Pr1+ and Pr1-with the duty ratio of 50% and the amplitude of VDD, and outputting the square wave signals Pr1+ and Pr1-to the danger area circuit.
Specifically, the danger zone circuit comprises a power distribution branch, a danger zone power supply branch and a first signal transmission branch;
the input end of the power distribution branch circuit is electrically connected with the output end of the power supply area circuit, and the output end of the power distribution branch circuit is electrically connected with the vibration sensor and is used for supplying power to the vibration sensor;
the input end of the dangerous area power supply branch circuit is electrically connected with the output end of the power supply area circuit and is used for supplying power to the dangerous area circuit;
the input end of the first signal transmission branch is electrically connected with the vibration sensor, and the output end of the first signal transmission branch is electrically connected with the safety zone circuit through the isolation transformer and is used for inputting signals received by the vibration sensor into the safety zone circuit after polarity inversion.
Specifically, the power distribution branch circuit comprises a rectifier circuit, a second current limiter circuit, a first voltage stabilizer circuit and a power regulator circuit which are electrically connected in sequence;
the rectifier sub-circuit is used for receiving the isolated transformer 1 from the power supply area circuit: square wave signals Pr1+ and Pr1-transmitted by the 2 windings are rectified to obtain a signal Vdn-;
the second current limiter circuit is used for receiving the signal Vdn-and performing current limiting protection;
the first voltage stabilizing sub-circuit is used for receiving the signal Vdn-after current limiting and limiting voltage;
the power regulation sub-circuit is used for receiving the voltage-limited signal Vdn-and performing power limitation, and then outputting the signal Vdn-to the vibration sensor.
Specifically, the first signal transmission branch circuit comprises a second voltage stabilizing sub-circuit, a third current limiter circuit, a polarity conversion sub-circuit, a voltage divider circuit and a transmission sub-circuit which are electrically connected in sequence;
the second voltage stabilizing sub-circuit is used for receiving a voltage signal from the vibration sensor and limiting voltage;
the third current limiter circuit is used for receiving the voltage signal subjected to voltage limiting and performing current limiting protection;
the polarity conversion sub-circuit is used for receiving the voltage signal after current limiting and realizing reverse conversion on the polarity;
the voltage dividing sub-circuit is used for dividing the voltage signal after the polarity direction;
the transmission sub-circuit is used for outputting the divided voltage signal after the operation amplifier follows.
Specifically, the safe zone circuit comprises a safe zone power supply branch and a second signal transmission branch;
the input end of the safety zone power supply branch circuit is electrically connected with the power supply end of the dangerous zone circuit and is used for supplying power to the safety zone circuit;
the input end of the second signal transmission branch is electrically connected with the dangerous area circuit through the isolation transformer, and the output end of the second signal transmission branch is electrically connected with the external control system and is used for inputting signals received from the dangerous area circuit to the external control system after polarity inversion.
Specifically, the safe zone power supply branch comprises a first power supply sub-branch and a second power supply sub-branch;
the first power supply sub-branch is used for passing square wave signals Pr1+, pr1-through the isolation transformer 1:2, carrying out bridge rectification after winding transmission to obtain a current Vsn-;
the second power supply sub-branch is used for passing square wave signals Pr1+, pr1-through the isolation transformer 1: carrying out half-wave rectification after the 1 winding is transmitted to obtain current V < 2+ >;
the current Vsn-and the current v2+ together supply the safety zone circuit.
Specifically, the second signal transmission branch circuit comprises a synchronous sub-circuit, a reverse sub-circuit and a filtering sub-circuit which are electrically connected in sequence;
the synchronous sub-circuit is used for receiving signals output from the dangerous area circuit through the isolation transformer and synchronizing oscillation frequency;
the reverse sub-circuit is used for receiving the signal after the oscillation frequency synchronization and realizing reverse conversion in polarity;
the filtering sub-circuit is used for receiving the signal after the reverse direction and outputting a value external control system after performing second-order filtering processing.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
the invention provides a vibration sensor type isolation safety barrier, which is used for carrying out voltage signal transmission between a control system and a field vibration sensor, limiting the energy on a transmission line, carrying out data transmission, system detection and fault diagnosis in a safe and controllable range, and carrying out signal isolation transmission and explosion-proof treatment;
the signals are output in a mode of input attenuation, isolation and amplification, so that the power consumption of the signals in isolated transmission is reduced, the signal transmission loss is reduced, and the transmission efficiency and the transmission precision are improved;
the safety grid transmission signal can be calibrated by adjusting the RV1 and RV2 adjustable resistor, software is not required to be used for calibration, and the cost is low and convenient;
the intrinsic safety side carries out intrinsic safety design, a 13V voltage stabilizing tube is used for Z1-Z4 (Ex), 5% tolerance is calculated, and external voltage of the terminal is not more than 27.3V; d10 to D13 (Ex) use SS16 diodes to limit the port voltage; f4 R18, RJ1 (Ex) limits port current; r9, R29, R30, R31, R32 (Ex) limit the port maximum output power.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic block diagram of a vibration sensor type isolated safety barrier of the present invention;
FIG. 2 is a schematic diagram of a power domain circuit according to the present invention;
FIG. 3 is a schematic diagram of a hazard zone circuit of the present invention;
FIG. 4 is a schematic diagram of a safe area circuit according to the present invention;
fig. 5 is a schematic diagram of the power distribution and consumption of the vibration sensor type isolated safety barrier of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
The vibration sensor type isolation type safety fence provided by the invention is further described in detail below with reference to the attached drawings and specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Examples
Referring to fig. 1 to 4, the present embodiment provides a vibration sensor type isolation safety barrier, which is capable of performing voltage signal transmission between a control system and a vibration sensor on site, limiting energy on a transmission line, performing data transmission, system detection and fault diagnosis within a safe and controllable range, and performing functions of signal isolation transmission and explosion protection processing. The embodiment adopts a discrete device construction scheme, the whole scheme is simple, the material cost is low, the failure rate is low, and the reliability is higher; the signals are output in a mode of input attenuation, isolation and amplification, so that the power consumption of the signals in isolated transmission is reduced, the signal transmission loss is reduced, the transmission efficiency and the accuracy are improved, and the anti-interference capability is high.
First, referring to fig. 1, the present embodiment generally includes: a power supply area circuit, a hazardous area circuit and a safe area circuit. The Power supply area circuit is responsible for supplying Power to the whole safety grating machine and the vibration sensor, in order to ensure that the safety grating meets the intrinsic safety requirement, the Power supply is performed to the dangerous area circuit from the Power supply area through the isolation transformer, the Power of the dangerous area circuit is supplied to the vibration sensor at the front end through the Power and Common port of the dangerous area circuit, and meanwhile, the dangerous area Power supply also has the function of supplying Power to the safe area circuit through the isolation transformer. The power supply region circuit supports (20-35) V inputs. The vibration sensor outputs (-20 to-5) V voltage signals through a Signal and a Common port, and outputs (-20 to-5) V voltage signals to an external control system after reverse conversion of a dangerous area circuit, isolation transmission of an isolation transformer and reverse conversion of a safe area circuit. The embodiment completes the 1:1 signal isolation transmission, wherein the frequencies of the two sides of the isolation transformer are the same, so that the control loops on the two sides can be switched on or off simultaneously, and the transmission efficiency and the transmission precision are improved.
Referring to fig. 2, the power supply region circuit of the present embodiment will now be described: specifically, the power supply area circuit can be divided into a port protection sub-circuit, a first current limiter sub-circuit, a Buck sub-circuit and a modulation sub-circuit according to the function of the power supply area circuit.
The input end of the port protection subcircuit is connected with an external power supply, so that the input power supply is prevented from damaging the embodiment, namely, the external power supply (20-35) V is input through a J1 terminal (typical value 24V). The port protection subcircuit comprises an inductor L1 and an inductor L3 which are arranged in parallel, and TVS tubes which are respectively connected with the inductor L1 and the inductor L3, wherein two ends of each TVS tube are also connected with two input ports of the J1 terminal. In addition, the output end of L3 is connected with an anti-reverse device M1.
The input end of the first current limiter circuit is electrically connected with the output end of the port protection subcircuit to play a role in current limiting, specifically, the current output from the L1 is sequentially output after passing through the resistor R1 and the fuse F1.
Then, the 24V signal passes through a Buck circuit consisting of the chip U1, the capacitor C1, the resistor R3, the resistor R4, the resistor R5, the diode D1, and the inductor L2 to generate VDD power (about 13V). The 4, 5 ports of U1 connect the output of first current limiter circuit, and its 3 port is connected resistance R3's one end and resistance R5's one end respectively, and resistance R3's the other end is connected with diode D1's positive pole, and diode D1's negative pole then is connected with resistance R3's the other end and resistance R4's one end and chip U1's 6 port electricity. The 1 port of the chip U1 is electrically connected with the inductor L2 through the capacitor C1. The input end of the modulation subcircuit is electrically connected with the output end of the Buck subcircuit, a group of square wave signals Pr1+, pr1-, with the amplitude of VDD and the duty ratio of 50% are generated by the VDD signal through the H bridge chip U2, the 3 port of the U2 is connected with a resistor R6, the resistor R6 is connected with a resistor R41 in series, one end of the resistor R41 is grounded, and the output waveform frequency can be adjusted by changing the resistor R6 and the resistor R41.
Referring to fig. 3, a description will now be given of a hazard zone circuit of the present embodiment, specifically, the hazard zone circuit may be artificially divided into a power distribution branch, a hazard zone power supply branch, and a first signal transmission branch according to functions.
The input end of the power distribution branch circuit receives square wave signals Pr1+ and Pr1-, and the output end of the power distribution branch circuit is electrically connected with the vibration sensor and is responsible for supplying power to the vibration sensor. Specifically, the power distribution branch circuit can be divided into a rectifier sub-circuit, a second current limiter sub-circuit, a first voltage stabilizer sub-circuit and a power regulator sub-circuit which are electrically connected in sequence according to functions. Namely square wave signal Pr1+, pr1-passes through T1 transformer 1: and 2, winding transmission, rectifying to obtain a signal Vdn-, and distributing Power to the vibration sensor through VT Power of a J3 terminal and Common. The rectifier sub-circuit is D2 and D3 bridge rectification, and the signal Vdn-can be obtained. Further, the signal Vdn-passes through a second current limiter circuit formed by a fuse F2 and a resistor R8 arranged in series to receive the signal Vdn-and perform current limiting protection. The signal Vdn-then goes into a first voltage regulator sub-circuit consisting of voltage regulators Z1, Z2, Z3 and Z4 to limit the port voltage. Then, the signal Vdn-passes through a power conditioning sub-circuit of resistors R9, R29, R30, R31 and R32 arranged in series to limit the port power.
The input end of the dangerous area power supply branch also receives square wave signals Pr1+, pr1-, and the square wave signals Pr1+, pr1-are used for supplying power to the dangerous area circuit, specifically, the square wave signals Pr1+, pr1-pass through the T2 transformer 1: the 2 windings are transmitted and then bridge-rectified through diodes D5 and D6 to obtain two paths of currents V1 < + >, V1 < - >, and the two paths of currents supply power for the dangerous area circuit.
The input of the first Signal transmission branch is electrically connected to the vibration sensor through In Signal-, common (Common is connected to GND2 through magnetic bead BL1, which may be an approximately equivalent site) of the J4 terminal. The output end of the first signal transmission branch is electrically connected with the safety zone circuit through the isolation transformer and is responsible for inputting signals received from the vibration sensor into the safety zone circuit after polarity inversion.
Specifically, the received signal is outputted after the second voltage stabilizing sub-circuit, the third current limiting sub-circuit, the polarity converting sub-circuit, the voltage dividing sub-circuit and the transmitting sub-circuit are sequentially outputted. Namely, the signal enters a second voltage stabilizing sub-circuit formed by diodes D10, D11, D12 and D13 which are arranged in parallel to realize voltage limiting protection, and then enters a third current limiting sub-circuit formed by a resistor R18 and a fuse F4 which are arranged in series to receive the voltage signal subjected to voltage limiting and carry out current limiting protection. Then, the voltage signal after current limiting enters a polarity conversion sub-circuit and flows into Pin2 of the operational amplifier U4A, and the polarity conversion sub-circuit can realize reverse conversion on the signal polarity. In the polarity conversion sub-circuit, pin3 of the operational amplifier U4A is connected with a capacitor C33 and grounded, pin2 thereof is also respectively and electrically connected with one end of a resistor RJ5, one end of a capacitor C34 and one end of a resistor R33, and the other end of the resistor RJ5 is connected with Pi of the operational amplifier U4A through a resistor RJ6n1 is electrically connected, the other end of the capacitor C34 is directly electrically connected to Pin1 of the operational amplifier U4A, and the other end of the resistor R33 is electrically connected to the potentiometer RV 1. The potentiometer RV1 is designed for output zero point adjustment and eliminates zero point errors caused by offset voltage of the operational amplifier U4A. Further, it is found that V Pin2 ＝V Pin3 =0v. The signal input amplitude is between (-20 to minus 0.5) V,V Pin1 ≈(-0.08)*V Insignal- (V)。
thus, the input signal completes the reverse conversion in polarity and decays in amplitude to about 1/12 of the original value. The signal can be transmitted to a safe area through the isolation of a signal transformer, but considering that the signal transformer has certain loss, the signal attenuation ratio of a signal input end is smaller than the signal amplification factor of a signal output end in design and is equivalent to a mode of artificially amplifying and transmitting a voltage signal, correspondingly, in the amplifying and transmitting mode, in order to realize the 1:1 transmission of the VPin1 point voltage, a voltage divider circuit consisting of a potentiometer RV2 and a resistor RJ4 is arranged at the output end of a polarity conversion subcircuit, the voltage signal after the polarity direction is divided, and V can be realized Pin1 The small amplitude of the dot voltage decays. The potentiometer RV2 is used for measuring range calibration, and the voltage division ratio is finely adjusted by adjusting the RV2, so that measuring range adjustment is realized. The voltage value of the divided signal is output after being followed by an operational amplifier U4B, and enters a signal transmission link, namely a transmission sub-circuit, V T3-8 ≈(-0.08)*V InSignal - (V) realizing transmission of an input signal in the (-20-0.5) V interval by reverse processing and attenuation to about (0.04-1.6) V.
Referring to fig. 4, the safe-zone circuit of the present embodiment will now be described: specifically, the safe zone circuit can artificially divide the safe zone power supply branch and the second signal transmission branch according to functions.
The input end of the safety zone power supply branch circuit is electrically connected with the power supply end of the dangerous zone circuit and is used for supplying power to the safety zone circuit. In particular, the safety zone power supply branch may be divided into a first power supply sub-branch and a second power supply sub-branch. In the first power supply sub-branch, square wave signals Pr1+, pr1-are obtained from the danger zone circuit through the T1 transformer 1: the 2 windings are transmitted and enter a bridge rectifier circuit formed by diodes D7 and D8 to obtain current Vsn-. The second power supply sub-branch likewise passes the square wave signal Pr1+, pr1-through the transformer 1: after the 1 winding is transmitted, the current enters a half-wave rectifying circuit formed by a diode D9 to carry out half-wave rectification, so that the current V2+ is obtained, and the current Vsn-and the current V2+ jointly supply power for the safety area circuit.
The input end of the second signal transmission branch is electrically connected with the dangerous area circuit through the isolation transformer, and the output end of the second signal transmission branch is electrically connected with the external control system and is used for carrying out polarity inversion again on the signal received from the dangerous area circuit and then inputting the signal to the external control system. Specifically, the second signal transmission branch comprises a synchronous sub-circuit, an inverse sub-circuit and a filtering sub-circuit which are electrically connected in sequence. The synchronous sub-circuit is used for synchronizing the oscillation frequencies of the primary side and the secondary side of a T3 (Ex) transformer by using the oscillation frequencies of the primary side and the secondary side of a T2 (Ex) power transformer, so that the transmission of signal voltage from a dangerous area to a safe area is realized, the precision error caused by transformer loss and signal amplification factor can be regulated by the range adjustment potentiometer RV2, and the transmission result is that: v (V) T3-3 ＝V T3-8 ≈(-0.08)*V InSignal - (V). Then enter a reverse sub-circuit composed of U3A and peripheral circuits to satisfy V Pin2 ＝V Pin1 ＝0V，
As can be seen from the above equation, the design is deliberately designed to have an output value greater than the input value, because the transformer losses are taken into account, but even then the output value is still slightly greater than the input value, and the analysis of the signal input processing section according to the foregoing is regulated by means of the range adjustment potentiometer RV2, and finally, through a full series of transmissions, the original input voltage can be transmitted to V of U3A in a 1:1 ratio Pin1 Point, see FIG. 4, V Pin1 Point voltage is to fortuneAnd the reverse input end Pin6 of the amplifier U3B is subjected to second-order filtering treatment, and finally is output to a J2 terminal in a following mode to obtain Signal-, zero. Therefore, 1:1 transmission of measurement signals of the vibration sensor from a dangerous place to a safety area is realized, and the function of the vibration sensor type safety barrier is realized.
In summary, this embodiment provides a sensor type isolation safety barrier, can guarantee the safe transmission of the voltage signal of field device to control system, carries out explosion-proof processing simultaneously, and the energy on the circuit is insufficient to ignite explosive mixture, carries out electrical isolation to two equipment simultaneously, has strengthened industrial control's security and reliability.
Referring to fig. 5, the power distribution and power consumption of the embodiment are that a. When 20-35V is supplied, the power distribution capacity should meet the requirement shown in fig. 5, and when b.24v is supplied, the power distribution current is 22mA, and the working current is not more than 80mA when tested; c. the distribution current is unchanged, the power supply voltage is changed to 20V, and the working current is tested to be not more than 88mA; d. the distribution current is unchanged, the power supply voltage is changed to 35V, and the working current is tested to be not more than 63mA; e. when the power supply is changed within a prescribed range, the signal conversion accuracy is observed and recorded without being affected.
In addition, the embodiment has high precision and small phase difference before and after transmission, and the voltage transmission range is not less than (-20.0, -0.5) V. a. The direct current voltage is transmitted, and the output error is not more than +/-0.1V; b. the alternating voltage is transmitted at 0 Hz-1 kHz, and the output error is not more than +/-1%; c. alternating voltage is transmitted at 1 kHz-10 kHz, and the output error is not more than +/-1%; d. the alternating voltage is transmitted at 10 kHz-20 kHz, and the output error is not more than +/-1%; the phase difference before and after transmission is not more than 14 mu s in the range of 0 Hz-20 kHz.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (8)
1. A vibration sensor type isolation safety barrier electrically connected between a vibration sensor and an external control system, comprising: a power supply area circuit, a dangerous area circuit and a safe area circuit;
the power supply area circuit is electrically connected with the dangerous area circuit, and the power supply area circuit supplies power to the dangerous area circuit by adopting an isolation transformer;
the dangerous area circuit is respectively and electrically connected with the safe area circuit and the vibration sensor, and is used for supplying power to the vibration sensor and supplying power to the safe area circuit through the isolation transformer;
the vibration sensor outputs a voltage signal, and the voltage signal sequentially passes through the dangerous area circuit, the isolation transformer and the safe area circuit and then is output to an external control system.
2. The vibration sensor isolated safety barrier of claim 1, wherein the power domain circuit comprises a port guard sub-circuit, a first current limiter sub-circuit, a Buck sub-circuit, and a modulation sub-circuit;
the input end of the port protection subcircuit is connected with an external power supply and used for protecting the power supply area circuit;
the input end of the first current limiter circuit is electrically connected with the output end of the port protection subcircuit and is used for limiting the input current;
the input end of the Buck sub-circuit is electrically connected with the output end of the first current limiter circuit and is used for converting external current into a VDD power supply with required voltage;
the input end of the modulation sub-circuit is electrically connected with the output end of the Buck sub-circuit and is used for receiving a VDD power supply, generating square wave signals Pr1 and Pr 1-with the duty ratio of 50% and the amplitude of VDD, and outputting the square wave signals Pr1 and Pr 1-to the danger area circuit.
3. The vibration sensor type isolation safety barrier according to claim 2, wherein,
the dangerous area circuit comprises a power distribution branch, a dangerous area power supply branch and a first signal transmission branch;
the input end of the power distribution branch circuit is electrically connected with the output end of the power supply area circuit, and the output end of the power distribution branch circuit is electrically connected with the vibration sensor and is used for supplying power to the vibration sensor;
the input end of the dangerous area power supply branch circuit is electrically connected with the output end of the power supply area circuit and is used for supplying power to the dangerous area circuit;
the input end of the first signal transmission branch is electrically connected with the vibration sensor, and the output end of the first signal transmission branch is electrically connected with the safety zone circuit through the isolation transformer and is used for inputting signals received by the vibration sensor into the safety zone circuit after polarity inversion.
4. The vibration sensor type isolation safety barrier according to claim 3, wherein,
the power distribution branch circuit comprises a rectifier circuit, a second current limiter circuit, a first voltage stabilizer circuit and a power regulator circuit which are electrically connected in sequence;
the rectifier sub-circuit is configured to receive the isolated transformer 1 from the power domain circuit: square wave signals Pr1+ and Pr1-transmitted by the 2 windings are rectified to obtain a signal Vdn-;
the second current limiter circuit is used for receiving the signal Vdn-and performing current limiting protection;
the first voltage stabilizing sub-circuit is used for receiving the signal Vdn-after current limiting and limiting voltage;
the power regulation sub-circuit is used for receiving the signal Vdn-after voltage limiting, carrying out power limiting, and then outputting the signal Vdn-to the vibration sensor.
5. The vibration sensor type isolation safety barrier according to claim 3, wherein,
the first signal transmission branch circuit comprises a second voltage stabilizing sub-circuit, a third current limiter sub-circuit, a polarity conversion sub-circuit, a voltage divider sub-circuit and a transmission sub-circuit which are electrically connected in sequence;
the second voltage stabilizing sub-circuit is used for receiving the voltage signal from the vibration sensor and limiting voltage;
the third current limiter circuit is used for receiving the voltage signal subjected to voltage limiting and performing current limiting protection;
the polarity conversion sub-circuit is used for receiving the voltage signal after current limiting and realizing reverse conversion on the polarity;
the voltage dividing sub-circuit is used for dividing the voltage signal in the polarity direction;
the transmission sub-circuit is used for outputting the divided voltage signal after the operation amplifier follows.
6. The vibration sensor type isolation safety barrier according to claim 2, wherein,
the safe zone circuit comprises a safe zone power supply branch and a second signal transmission branch;
the input end of the safety zone power supply branch circuit is electrically connected with the power supply end of the dangerous zone circuit and is used for supplying power to the safety zone circuit;
the input end of the second signal transmission branch is electrically connected with the dangerous area circuit through the isolation transformer, and the output end of the second signal transmission branch is electrically connected with an external control system and is used for inputting signals received from the dangerous area circuit to the external control system after polarity inversion.
7. The vibration sensor type isolation safety barrier according to claim 6, wherein,
the safety zone power supply branch circuit comprises a first power supply sub-branch circuit and a second power supply sub-branch circuit;
the first power supply sub-branch is used for passing square wave signals Pr1+, pr1-through an isolation transformer 1:2, carrying out bridge rectification after winding transmission to obtain a current Vsn-;
the second power supply sub-branch is used for passing square wave signals Pr1+, pr1-through the isolation transformer 1: carrying out half-wave rectification after the 1 winding is transmitted to obtain current V < 2+ >;
the current Vsn-and the current v2+ together supply the safety zone circuit.
8. The vibration sensor type isolation safety barrier according to claim 6, wherein,
the second signal transmission branch circuit comprises a synchronous sub-circuit, a reverse sub-circuit and a filtering sub-circuit which are electrically connected in sequence;
the synchronous sub-circuit is used for receiving signals output from the dangerous area circuit through the isolation transformer and synchronizing oscillation frequency;
the reversing sub-circuit is used for receiving the signal after the oscillation frequency synchronization and realizing reversing conversion on the polarity;
the filtering sub-circuit is used for receiving the signal after the reverse direction and outputting a value external control system after performing second-order filtering processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310426183.2A CN116526845A (en) | 2023-04-20 | 2023-04-20 | Vibration sensor type isolation safety grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310426183.2A CN116526845A (en) | 2023-04-20 | 2023-04-20 | Vibration sensor type isolation safety grid |
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| Publication Number | Publication Date |
|---|---|
| CN116526845A true CN116526845A (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310426183.2A Pending CN116526845A (en) | 2023-04-20 | 2023-04-20 | Vibration sensor type isolation safety grid |
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| Country | Link |
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| CN (1) | CN116526845A (en) |
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- 2023-04-20 CN CN202310426183.2A patent/CN116526845A/en active Pending
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