CN102998502B - High-isolation voltage-resisting bidirectional signal sensor - Google Patents
High-isolation voltage-resisting bidirectional signal sensor Download PDFInfo
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Abstract
The invention discloses a high-isolation voltage-resisting bidirectional signal sensor. The high-isolation voltage-resisting bidirectional signal sensor mainly solves the problem that high-isolation voltage resistance can not be achieved due to the fact that existing signal isolation detection products in the prior art can not meet technical requirements of control systems. The high-isolation voltage-resisting bidirectional signal sensor comprises a voltage-current signal collecting circuit and a signal output conversion circuit, wherein an input end of the signal output conversion circuit is connected with the voltage-current signal collecting circuit through more than two signal isolation conversion circuits which are connected sequentially, and input ends of signal isolation conversion circuits and the input end of the signal output conversion circuit are connected a direct current-direct current (DCDC) high-isolation power modules respectively. According to the scheme, high-isolation voltage resistance and rapid high-precision signal monitoring can be achieved through the high-isolation voltage-resisting bidirectional signal sensor, the high-isolation voltage-resisting bidirectional signal sensor is a novel high-isolation voltage-resisting signal detection product, and a new solution is provided for localization of high-end control devices such as locomotive traction and mine power supplies and electric automatic devices. The high-isolation voltage-resisting bidirectional signal sensor has the high practical value and the high promotion value.
Description
Technical field
The present invention relates to a kind of signal transducer, specifically, relate to a kind of high isolation pressure resistant type two-way signaling sensor.
Background technology
As everyone knows, in Aulomatizeted Detect and control field, object type to be checked is a lot, complicated various especially at the occasion object type to be checked needing to monitor high pressure, as: in the important power-supply devices such as rail transit locomotive electric power system, wind-powered electricity generation, sun power and supervisory system, all need to detect the voltage and current signal in system, thus realize the automatic regulation and control of system.
What signal isolation detection product was in the market the most frequently used has following two kinds of principles:
1, magnetic principles of modulation and demodulation: carry out the inversion of direct current signal to AC signal by chopping way, by becoming the direct-flow output signal of standard by signals revivification after transformer isolation;
2, Phototube Coupling principle: adopt precision photoelectric coupler part, forms feedback closed loop measuring circuit by amplifier, the isolated variable of settling signal.
In above two kinds of principles, although the stability of the first and precision are all higher, but its response time is comparatively slow, can not practical requirement; Although the second response time is very fast, antijamming capability is comparatively strong, needs to provide insulating power supply; And these two kinds of modes all cannot both meet isolation between constrained input withstand voltage for 7.5KVAC or more than 8KVAC/minute, the technical requirement of signal isolation monitoring can be realized by quick high accuracy again, cannot meet nowadays high-level control system technical requirement.
Summary of the invention
The object of the present invention is to provide a kind of high isolation pressure resistant type two-way signaling sensor, mainly solve the problem that the signal isolation detection product existed in prior art can not meet the control system technical requirement of the high isolation environment of 7.5KVAC or more than 8KVAC.
To achieve these goals, the technical solution used in the present invention is as follows:
High isolation pressure resistant type two-way signaling sensor, comprise voltage and current signal Acquisition Circuit, the signal output transform circuit that the signal isolated variable circuit that input end is connected successively by two or more is connected with voltage and current signal Acquisition Circuit, the input end of described signal isolated variable circuit and signal output transform circuit is connected with DCDC height insulating power supply module respectively.
As preferably, described signal isolated variable circuit is two, comprise the first order signal isolated variable circuit that input end is connected with voltage and current signal Acquisition Circuit, to be connected with first order signal isolated variable circuit with input end and the second level signal isolated variable circuit that is connected with signal output transform circuit of output terminal, the input end of described first order signal isolated variable circuit is connected with a DCDC height insulating power supply module; The input end of second level signal isolated variable circuit is connected with the 2nd DCDC height insulating power supply module; The input end of signal output transform circuit is connected with the 3rd DCDC height insulating power supply module, the input end of described 2nd DCDC height insulating power supply module and the 3rd DCDC height insulating power supply module is all connected with power supply, and the input end of a DCDC height insulating power supply module is connected with the 2nd DCDC height insulating power supply module.
Specifically, described first order signal isolated variable circuit comprises the operational amplifier T2 that inverting input is connected with voltage and current signal Acquisition Circuit, and the opto-coupler chip U1 to be all connected with output terminal and the inverting input of operational amplifier T2, be connected to the electric capacity C1 between the inverting input of operational amplifier T2 and output terminal, a described DCDC height insulating power supply module is connected with the inverting input of operational amplifier T2; Described second level signal isolated variable circuit comprises the operational amplifier T3 that in-phase input end is all connected with opto-coupler chip U1 with inverting input, the operational amplifier T4 that inverting input is connected with the output terminal of operational amplifier T3, the opto-coupler chip U2 be all connected with output terminal and the inverting input of operational amplifier T4, also be connected with resistance R1 parallel with one another, electric capacity C2 between the inverting input of described operational amplifier T3 and output terminal, described 2nd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T3.
Wherein, described signal output transform circuit comprises the output transform circuit be connected with second level signal isolated variable circuit and the V/I signal conversion circuit be connected with output transform circuit, and described 3rd DCDC height insulating power supply module is connected with V/I signal conversion circuit.
Further, described output transform circuit comprises the operational amplifier T5 that in-phase input end is all connected with opto-coupler chip U2 with inverting input, the operational amplifier T6 that in-phase input end is connected with the output terminal of operational amplifier T5, also be connected with resistance R2 parallel with one another, electric capacity C3 between the inverting input of described operational amplifier T5 and output terminal, between the inverting input of described operational amplifier T6 and output terminal, be also connected with resistance R3 parallel with one another, electric capacity C4.
Further, described V/I signal conversion circuit comprises the operational amplifier T7 that inverting input is connected with the output terminal of operational amplifier T6, the operational amplifier T8 that inverting input is connected with the output terminal of operational amplifier T7, be connected to the resistance R4 between the inverting input of operational amplifier T7 and the output terminal of operational amplifier T8, described 3rd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T7.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention achieves reliable delivery and the conversion of high-voltage signal by signalization isolated variable circuit between voltage and current signal Acquisition Circuit and signal output transform circuit and power supply and DCDC height insulating power supply module, improve the dirigibility of signal transmission, greatly reduce cost, reduce sensor bulk, thus effectively reduce testing cost and the equipment manufacturing cost of system, be beneficial to batch production, be applicable to large-scale promotion application.
(2) in the present invention, signal isolation have employed multi-stage isolation technology respectively with isolated from power, such set-up mode both ensure that signal input, high-voltage isolating between output terminal and power supply, in turn ensure that the precision that signal converts, thus ensure that normally carrying out of high isolation signals linearity test, and empirical tests is learnt, effect is very good within 50us the response time.
(3) in the present invention, by voltage and current signal Acquisition Circuit, signal isolated variable circuit, DCDC height insulating power supply module, the cooperatively interacting of signal output transform circuit, effectively ensure that linear optical coupling is operated in optimum linear district, avoid the generation in input dead band; Also can export bi-directional voltage or bidirectional current signal when single supply, and empirical tests is learnt, accuracy of detection is within 0.2%FS, and effect is very good.
Accompanying drawing explanation
Fig. 1 is system chart of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
The control system technical requirement of the high isolation environment of 7.5KVAC or more than 8KVAC can not be met: provide+24V direct supply by control system to sensor to solve the signal isolation detection product existed in prior art, directly the voltage and current signal of primary side is measured, ensure Secure isolation that is on-the-spot and control system, solve the height isolation of a signal, the measurement of high precision and wide dynamic range, and Signal Matching, the practical problemss such as product power consumption and volume, reliability service for control system provides the problem of accurate foundation, the invention discloses a kind of high isolation pressure resistant type two-way signaling sensor, it comprises the voltage and current signal Acquisition Circuit connected successively, signal isolated variable circuit, signal output transform circuit, signal isolated variable circuit and signal output transform circuit are connected to DCDC height insulating power supply module.In order to fully guarantee that high isolation is with withstand voltage, have employed multi-stage isolation converter technique in the present invention, namely multilevel signal isolated variable circuit is set between voltage and current signal Acquisition Circuit and signal output transform circuit, signal output transform circuit and every grade of signal isolated variable circuit are connected a DCDC height insulating power supply module respectively, and each DCDC height insulating power supply module is interconnected.
As shown in Figure 1, this for arranging circuit block diagram during two-stage signal isolated variable circuit between voltage and current signal Acquisition Circuit and signal output transform circuit, the input end of signal output transform circuit is connected with voltage and current signal Acquisition Circuit by first order signal isolated variable circuit connected successively, second level signal isolated variable circuit, and the input end of first order signal isolated variable circuit is connected with a DCDC height insulating power supply module; The input end of second level signal isolated variable circuit is connected with the 2nd DCDC height insulating power supply module; The input end of signal output transform circuit is connected with the 3rd DCDC height insulating power supply module, and the 2nd DCDC height insulating power supply module is all connected with power supply with the input end of the 3rd DCDC height insulating power supply module, the input end of a DCDC height insulating power supply module is connected with the 2nd DCDC height insulating power supply module.
In the present invention, adopt the Unidirectional direct-current power supply of+24V as power supply; The linear isolation translation circuit of signal adopts DCDC high delimitation order to power to power module, and output circuit adopts DCDC height isolation bi-directional power module for power supply.Empirical tests is learnt, the application of the invention, can complete and there is the withstand voltage linearly isolated variable of 10KVAC height isolation, by multi-stage transformation and isolation, both ensure that input, export with power supply between high-voltage isolating, in turn ensure that the precision that signal converts, and the response time is fast, can export unidirectional or bidirectional DC voltage or current signal, the signal that can export comprises ± 20mA/4 ~ 20mA; ± 5V/ ± 10V etc., the input signal of support of the present invention comprises DC ± 20mV/ ± 90mV/ ± 150mV/ ± 300mV/ ± 500mV/ ± 1V/ ± 10V/ ± 1000V etc.
In the present invention, signal output transform circuit comprises the output transform circuit be connected with second level signal isolated variable circuit and the V/I signal conversion circuit be connected with output transform circuit, and described 3rd DCDC height insulating power supply module is connected with V/I signal conversion circuit.
As shown in Figure 2, first order signal isolated variable circuit comprises the operational amplifier T2 that inverting input is connected with voltage and current signal Acquisition Circuit, and the opto-coupler chip U1 to be all connected with output terminal and the inverting input of operational amplifier T2, be connected to the electric capacity C1 between the inverting input of operational amplifier T2 and output terminal, a described DCDC height insulating power supply module is connected with the inverting input of operational amplifier T2; Described second level signal isolated variable circuit comprises the operational amplifier T3 that in-phase input end is all connected with opto-coupler chip U1 with inverting input, the operational amplifier T4 that inverting input is connected with the output terminal of operational amplifier T3, the opto-coupler chip U2 be all connected with output terminal and the inverting input of operational amplifier T4, also be connected with resistance R1 parallel with one another, electric capacity C2 between the inverting input of described operational amplifier T3 and output terminal, described 2nd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T3; Output transform circuit comprises the operational amplifier T5 that in-phase input end is all connected with opto-coupler chip U2 with inverting input, the operational amplifier T6 that in-phase input end is connected with the output terminal of operational amplifier T5, also be connected with resistance R2 parallel with one another, electric capacity C3 between the inverting input of described operational amplifier T5 and output terminal, between the inverting input of described operational amplifier T6 and output terminal, be also connected with resistance R3 parallel with one another, electric capacity C4; V/I signal conversion circuit comprises the operational amplifier T7 that inverting input is connected with the output terminal of operational amplifier T6, the operational amplifier T8 that inverting input is connected with the output terminal of operational amplifier T7, be connected to the resistance R4 between the inverting input of operational amplifier T7 and the output terminal of operational amplifier T8, described 3rd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T7.
As preferably, in the present invention, voltage and current signal Acquisition Circuit comprises the operational amplifier T1 that output terminal is connected with the inverting input of operational amplifier T2, is connected with resistance parallel with one another and electric capacity between the inverting input of this operational amplifier T1 and output terminal; DCDC height insulating power supply module comprises the basic circuit of power supply chip and formation thereof.
On the basis of foregoing circuit, the present embodiment needs the isolation distance ensured when PCB layout between each several part circuit, is also connected with part auxiliary element, for ensureing the normal operation of circuit, the use of these auxiliary elements, belongs to the circuit application custom of industry universal, does not repeat them here.
Implementation procedure of the present invention is as follows:
Voltage and current signal Acquisition Circuit is transformed to the input signal of unified specification the electric current and voltage input signal at scene, as: ± 60mV/ ± 100mV etc. samples, by operational amplifier, signal is zoomed into unified signal again and carry out isolated variable, just can realize the unification of late-class circuit according to input signal adjustment parameter.The DCDC height insulating power supply module of power acquisition 6KV, the output of last DCDC height insulating power supply module is as the input of a rear DCDC height insulating power supply module, signal isolated variable circuit adopts linear photoelectric isolation translation circuit, the circuit that we adopt HCNR201/HCNR200 and other similar chips to form is as signal conversion circuit, the output of previous stage signal conversion circuit, as the input of rear stage signal conversion circuit, together form linear photoelectric isolation translation circuit with operational amplifier.The offset signal that linear photoelectric isolation translation circuit is fixed by superposition, linear optical coupling is stabilized in optimum linear district, avoid input dead band, input signal is after multi-stage power source and signal isolated variable, by signal output transform circuit transformations be computer system energy identifying processing standard signal, as ± 20mA/4 ~ 20mA/ ± 5V/ ± 10V etc.When signal transmission is to signal output transform circuit, signal output transform circuit does subtraction by operational amplifier, deduct the offset signal of prime superposition, to guarantee the transduced precision of signal, signal output transform circuit is amplified by two-stage, ensure that the response time on the one hand, voltage signal can be selected on the other hand flexibly to export or current signal output, the current signal conversion fraction of output transform circuit adopts unity gain positive-feedback circuit, when electric current output sampling load is changed within the specific limits, output current does not change, thus reach the withstand voltage function of high isolation.
In order to ensure the performance of the present invention in concrete use, in the present embodiment, provide the test data under following several groups of different parameters:
Input signal is ± 180mv, external 250 Ohmages, monitoring voltage value, and test data is as table 1:
Table 1
Input signal is ± 20mv, and output signal is 0 ~ 20mA; External 250 Ohmages, monitoring voltage value, test data is as table 2:
Table 2
Input signal is ± 150mv, and output signal is 4 ~ 20mA; External 250 Ohmages, monitoring voltage value, test data is as table 3:
Table 3
Input signal is ± 90mv, outputs signal as ± 10V; Monitoring voltage value, test data is as table 4:
Table 4
Following parameter value of the present invention can be calculated according to above-mentioned four groups of test datas:
Error amount is: γ=│ (X1-X0) │ × 100%/│ Xn │, and wherein, X0 is theoretical output valve; Xn is output range; X1 is real output value.
Taking absolute value maximum is fundamental error of the present invention, and by test record data, calculate monitor and feedback, can draw, the said goods is all better than the accuracy requirement of 0.2%FS.
Respectively voltage-withstand test is carried out to four kinds of products: at input end respectively and under the condition applying AC10KV voltage (2mA leaks electricity) between power supply and output terminal, continue 1 minute, without arcing; Apply the condition of AC 5KV voltage (2mA electric leakage) between power supply and output terminal under, continue 1 minute, without arcing; Testing product after voltage-withstand test, product stands intact bad.
Apply full scale input signal at input end, power supply is changed between 19V ~ 27V, monitor and show that exporting change maximal value is 4mv, output load change is in 5mv.
The square-wave signal of the 10KHZ in input end superposition range ability, the waveform of paired observation input and output, finally draws response time equal <50us.
From above-mentioned test result, performance of the present invention is comparatively stable, better can meet every demand of user.
According to above-described embodiment, just the present invention can be realized well.
Claims (4)
1. high isolation pressure resistant type two-way signaling sensor, it is characterized in that, comprise voltage and current signal Acquisition Circuit, the signal output transform circuit that the signal isolated variable circuit that input end is connected successively by two or more is connected with voltage and current signal Acquisition Circuit, the input end of described signal isolated variable circuit and signal output transform circuit is connected with DCDC height insulating power supply module respectively;
Described signal isolated variable circuit is two, comprise the first order signal isolated variable circuit that input end is connected with voltage and current signal Acquisition Circuit, to be connected with first order signal isolated variable circuit with input end and the second level signal isolated variable circuit that is connected with signal output transform circuit of output terminal, the input end of described first order signal isolated variable circuit is connected with a DCDC height insulating power supply module; The input end of second level signal isolated variable circuit is connected with the 2nd DCDC height insulating power supply module; The input end of signal output transform circuit is connected with the 3rd DCDC height insulating power supply module, the input end of described 2nd DCDC height insulating power supply module and the 3rd DCDC height insulating power supply module is all connected with power supply, and the input end of a DCDC height insulating power supply module is connected with the 2nd DCDC height insulating power supply module;
Described first order signal isolated variable circuit comprises the operational amplifier T2 that inverting input is connected with voltage and current signal Acquisition Circuit, and the opto-coupler chip U1 to be all connected with output terminal and the inverting input of operational amplifier T2, be connected to the electric capacity C1 between the inverting input of operational amplifier T2 and output terminal, a described DCDC height insulating power supply module is connected with the inverting input of operational amplifier T2;
Described second level signal isolated variable circuit comprises the operational amplifier T3 that in-phase input end is all connected with opto-coupler chip U1 with inverting input, the operational amplifier T4 that inverting input is connected with the output terminal of operational amplifier T3, the opto-coupler chip U2 be all connected with output terminal and the inverting input of operational amplifier T4, also be connected with resistance R1 parallel with one another, electric capacity C2 between the inverting input of described operational amplifier T3 and output terminal, described 2nd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T3.
2. height isolation pressure resistant type two-way signaling sensor according to claim 1, it is characterized in that, described signal output transform circuit comprises the output transform circuit be connected with second level signal isolated variable circuit and the V/I signal conversion circuit be connected with output transform circuit, and described 3rd DCDC height insulating power supply module is connected with V/I signal conversion circuit.
3. height isolation pressure resistant type two-way signaling sensor according to claim 2, it is characterized in that, described output transform circuit comprises the operational amplifier T5 that in-phase input end is all connected with opto-coupler chip U2 with inverting input, the operational amplifier T6 that in-phase input end is connected with the output terminal of operational amplifier T5, also be connected with resistance R2 parallel with one another, electric capacity C3 between the inverting input of described operational amplifier T5 and output terminal, between the inverting input of described operational amplifier T6 and output terminal, be also connected with resistance R3 parallel with one another, electric capacity C4.
4. height isolation pressure resistant type two-way signaling sensor according to claim 3, it is characterized in that, described V/I signal conversion circuit comprises the operational amplifier T7 that inverting input is connected with the output terminal of operational amplifier T6, the operational amplifier T8 that inverting input is connected with the output terminal of operational amplifier T7, be connected to the resistance R4 between the inverting input of operational amplifier T7 and the output terminal of operational amplifier T8, described 3rd DCDC height insulating power supply module is connected with the inverting input of operational amplifier T7.
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| CN113037077B (en) * | 2021-03-16 | 2022-06-28 | 中北大学 | Explosion fragment speed measurement target net isolating circuit |
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