CN204101622U - The intelligent digital current voltmeter that a kind of power supply DC48V powers - Google Patents
The intelligent digital current voltmeter that a kind of power supply DC48V powers Download PDFInfo
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- CN204101622U CN204101622U CN201420432945.6U CN201420432945U CN204101622U CN 204101622 U CN204101622 U CN 204101622U CN 201420432945 U CN201420432945 U CN 201420432945U CN 204101622 U CN204101622 U CN 204101622U
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Abstract
The utility model provides a kind of power supply DC48V intelligent digital current voltmeter of powering, comprise switch power module, current/voltage input signal processing module, digital display module, microprocessor module, button design module, communication output module, become and send output module, described switch power module respectively with described microprocessor module, described digital display module is connected with described current/voltage input signal processing module, described microprocessor module respectively with described current/voltage input signal processing module, described digital display module, described communication output module, output module and described button design model calling are sent in described change.The utility model is reliable and stable, antijamming capability is strong, the parameters such as range can be measured arbitrarily, precision can reach 0.2%FS, belong to panel-mounted instrument series, mainly be used on power cabinet and do current/voltage monitoring, DC4 ~ 20mA long-distance transmissions can also be exported simultaneously, can also direct RS485 communication interface PLC, industrial computer etc.Be mainly used in post telecommunications system, comprise mobile communication industry and in the DC power cabinet of DC48V Power supply, post and telecommunications industry can only be widely used in.
Description
Technical field
The utility model relates to a kind of intelligent digital current voltmeter, particularly relates to the intelligent digital current voltmeter that a kind of power supply DC48V powers.
Background technology
The design and development of intelligent digital current voltmeter has had a lot of type and style, but existing major part is AC220V working power in the market, when being designed to Switching Power Supply, also can only be about AC/DC85 ~ 265V, or DC24V working power, or about DC10 ~ 30V.But require it is DC48V working power in post and telecommunications industry, major part, so require that the digital electronic ammeter of supporting display, digital voltmeter are all DC48V working powers, therefore designing a DC48V of meeting Switching Power Supply, to be widely used in the electric instrument of post and telecommunications industry just necessary.
Utility model content
The technical problems to be solved in the utility model is the defect existed for prior art, design the intelligent digital current voltmeter that a kind of power supply DC48V powers, be mainly used in post telecommunications system, comprise movement, telecommunications industry, can only in the DC power cabinet of DC48V Power supply, the power range of its actual field requirement is generally about DC36 ~ 60V, band RS485 communication, arranges arbitrarily instrument parameter.
A kind of technical scheme is provided: the intelligent digital current voltmeter that a kind of power supply DC48V powers for solving the problems of the technologies described above the utility model, it is characterized in that: comprise switch power module, current/voltage input signal processing module, digital display module, microprocessor module, button design module, communication output module, become and send output module, described switch power module respectively with described microprocessor module, described digital display module is connected with described current/voltage input signal processing module, described microprocessor module respectively with described current/voltage input signal processing module, described digital display module, described communication output module, output module and described button design model calling are sent in described change.
Described switch power module adopts on-off controller, photoelectric isolating device, TOP414G selected by described on-off controller, described Switching Power Supply is AC/DC universal, operating voltage DC48V directly inputs, alternating voltage converts DC voltage to through bridge rectifier filtering, again by described on-off controller self-sustained oscillation, again direct current is become interchange in conjunction with switch transformer, next tickler is passed through, switch transformer secondary alternating voltage converts DC voltage to again through rectifying and wave-filtering, the positive and negative 5V of direct stable output and positive 24V tri-groups of power supplys after integrated package of pressure-stabilizing and capacitor filtering again.
Described microprocessor module adopts microprocessor ATmega16, carries the A/D conversion of 10,8 tunnel, is powered by described switch power module.
Described current/voltage input signal processing module is made up of small-sized mutual inductor and precise rectification circuit, alternating current is directly by small-sized mutual inductor perforation Isolation input, alternating voltage is at mutual inductor front end serial connection current-limiting resistance Isolation input, and the AC signal after isolation is directly changed into DC voltage through precise rectification circuit; Direct current signal is directly amplified by precise rectification circuit, filtering converts galvanic current pressure to; The DC voltage changed through precise rectification circuit is input to described microprocessor Pa0 port.
Described change send output module that described microprocessor module port Pd5 output frequency signal is passed through Phototube Coupling, be shaped to square wave, direct current is become again by pi type filter, V/I change-over circuit again through being made up of U, Q, directly carry out V/I conversion, output signal DC4 ~ 20mA is sent in the change exporting isolation.
Described communication output module is connected with described microprocessor port Pd0, Pd1, Pd2 by integrated package SP485, and adopt RS485 communication modes, Modbus-RTU agreement, is directly connected with industrial computer by 485 turns of 232 or 485 turns of USB.
Described button design modular design setting key, increase key, reduce key three buttons, to be connected with described microprocessor port Pc1, Pc6, Pc7 respectively.
Described digital display module adopts the positive group of four figures pipe display of LED, described microprocessor Pd6, Pd7 port is directly inputted to 74HC164,74HC164 exports 7 strokes of 8 lines and described charactron and scaling position is connected, each position of described microprocessor Pb4 ~ Pb7 signal Direct driver charactron.
The beneficial effects of the utility model are: stable and reliable for performance, the parameters such as range can be measured arbitrarily, precision can reach 0.2%FS, antijamming capability increases simultaneously, by design software filtering, makes it show more stable, reliable, DC4 ~ 20mA long-distance transmissions can also be exported do current/voltage monitoring on power cabinet while, direct RS485 communication interface PLC, industrial computer etc., improve its applicability, be widely used in post and telecommunications industry.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model
Fig. 2 is microcontroller circuit
Fig. 3 is alternating current, alternating voltage input circuit
Fig. 4 is precise rectification circuit
Fig. 5 is that output circuit is sent in change
Fig. 6 is digital-scroll technique circuit
Fig. 7 is communication output circuit
Fig. 8 is switching power circuit
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Fig. 1 ~ Fig. 8, the utility model comprises switch power module, current/voltage input signal processing module, digital display module, microprocessor module, button design module, communication output module, become and send output module, described switch power module respectively with described microprocessor module, described digital display module is connected with described current/voltage input signal processing module, described microprocessor module respectively with described current/voltage input signal processing module, described digital display module, described communication output module, output module and described button design model calling are sent in described change.
This contactor power unit: TOP414G, U5 that on-off controller U4 adopts are photoelectric isolating devices; Switching Power Supply is all generally AC/DC universal, so operating voltage 48V is directly by R30, L1, C10 input, alternating voltage through D1 ~ D4, C11, can DC voltage be converted to, DC voltage then directly inputs and comes, vibration is produced by U4 self-excitation, tickler before again direct current being become interchange, D9 in conjunction with switch transformer B1, switch transformer secondary alternating voltage converts DC voltage to through D6, C14, D7, C15, again through integrated package of pressure-stabilizing U1, U2 voltage stabilizing, the positive and negative 5V of direct stable output after C2, C3, C5, C6 filtering; Same reason, switch transformer secondary converts DC voltage to through D8, C16, the DC24V power supply of stable output after U3, C8, C9; Export 3 groups of power supplys altogether.
This circuit U 6 microprocessor adopts ATmega16, and it carries the A/D conversion of 10,8 tunnel.
This circuit is when input exchange signal, inputted by small-sized mutual inductor, electric current is directly bored a hole, and voltage goes here and there current-limiting resistance RaX, RaY before mutual inductor, then at secondary and sampling resistor Ra0, the AC signal after isolation is directly changed into DC voltage through precise rectification circuit; When input direct-current signal, directly amplify process by U7, U8, convert galvanic current pressure to by R9, C19 filtering, be input to PA0 mouth.
Become the design sending output: by U6 output frequency signal, by the Phototube Coupling of U9, signal after isolation becomes square wave by U10 shaping again, direct current is become again by U11, Q1 by the pi type filter of C23, R25, C24, direct V/I conversion, output signal DC4 ~ 20mA is sent in the change exporting isolation.
The design of RS485 communication: integrated package U14 is SP485, adopt RS485 communication modes, Modbus-RTU agreement, directly can be connected with industrial computer by 485 turns of 232 or 485 turns of USB; Communication baud rate Default Value is conventional 9600bps, and this circuit adopts software calibration, without potentiometer design, has the menu of calibration in actions menu.
Intelligent digital current voltmeter devises three and presses strong: setting key KS, increase key KO, minimizing key KC, the parameter of electric instrument can be set, comprise and measure range, ER effect than revising at coefficient, voltage change ratio coefficient, zero point, becoming and send range set, the address and communication baud rate etc. of output, also comprise electric instrument input signal zero point correction, full scale calibration, change send and export the isoparametric setting of calibration.
Display mainly adopts the positive group of four figures pipe display of LED, and Pd6, Pd7 are directly inputted to U12, U12 and export 7 strokes and the scaling position that 8 lines directly arrive charactron, each position of Pb4 ~ Pb7 signal Direct driver charactron in addition.
Because be adopt software calibration, design without potentiometer, so the correctness of hardware simply must be judged before formal calibration, when hardware occurs abnormal time, there will be the phenomenon that cannot calibrate, so devise several monitoring point in whole circuit, judge that whether hardware circuit is normal, inspection as source of stable pressure :+5V ,-5V, 24V etc., checks U7, U8 supply voltage amplifier pin output voltage etc. simultaneously respectively; When input AC electric current, directly to be bored a hole Isolation input by shape small size current mutual inductor, during input ac voltage, at mutual inductor front end serial connection current-limiting resistance RaX, RaY Isolation input, when input direct voltage, directly by RaX, RaY two electric resistance partial pressure, during input direct-current electric current, input shunt signal DC75mV, a high-impedance resistors in parallel is at input end, direct current signal directly amplifies process by U7, U8, converts galvanic current pressure to by R9, C19 filtering.D11, D12 is not then filled directly by D12 short circuit during certain measurement direct current.
In order to improve antijamming capability, the utility model devises software filtering, makes display more stable, reliable, thus improves its applicability.
Facts have proved that the utility model is reliable and stable, precision can reach 0.2%FS, be widely used in post and telecommunications industry.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (8)
1. the power supply DC48V intelligent digital current voltmeter of powering, it is characterized in that: comprise switch power module, current/voltage input signal processing module, digital display module, microprocessor module, button design module, communication output module, become and send output module, described switch power module respectively with described microprocessor module, described digital display module is connected with described current/voltage input signal processing module, described microprocessor module respectively with described current/voltage input signal processing module, described digital display module, described communication output module, output module and described button design model calling are sent in described change.
2. the power supply DC48V according to claim 1 intelligent digital current voltmeter of powering, it is characterized in that: described switch power module adopts on-off controller, photoelectric isolating device, TOP414G selected by described on-off controller, described Switching Power Supply is AC/DC universal, operating voltage DC48V directly inputs, alternating voltage converts DC voltage to through bridge rectifier filtering, again by described on-off controller self-sustained oscillation, again direct current is become interchange in conjunction with switch transformer, next tickler is passed through, switch transformer secondary alternating voltage converts DC voltage to again through rectifying and wave-filtering, the positive and negative 5V of direct stable output and positive 24V tri-groups of power supplys after integrated package of pressure-stabilizing and capacitor filtering again.
3. the power supply DC48V according to claim 1 intelligent digital current voltmeter of powering, is characterized in that: described microprocessor module adopts microprocessor ATmega16, carries the A/D conversion of 10,8 tunnel, is powered by described switch power module.
4. the power supply DC48V according to claim 3 intelligent digital current voltmeter of powering, it is characterized in that: described current/voltage input signal processing module is made up of small-sized mutual inductor and precise rectification circuit, alternating current is directly by small-sized mutual inductor perforation Isolation input, alternating voltage is at mutual inductor front end serial connection current-limiting resistance Isolation input, and the AC signal after isolation is directly changed into DC voltage through precise rectification circuit; Direct current signal is directly amplified by precise rectification circuit, filtering converts galvanic current pressure to; The DC voltage changed through precise rectification circuit is input to described microprocessor Pa0 port.
5. the power supply DC48V according to claim 3 intelligent digital current voltmeter of powering, it is characterized in that: described change send output module that described microprocessor module port Pd5 output frequency signal is passed through Phototube Coupling, be shaped to square wave, direct current is become again by pi type filter, V/I change-over circuit again through being made up of U, Q, directly carry out V/I conversion, output signal DC4 ~ 20mA is sent in the change exporting isolation.
6. the power supply DC48V according to claim 3 intelligent digital current voltmeter of powering, it is characterized in that: described communication output module is connected with described microprocessor port Pd0, Pd1, Pd2 by integrated package SP485, adopt RS485 communication modes, Modbus-RTU agreement, is directly connected with industrial computer by 485 turns of 232 or 485 turns of USB.
7. the power supply DC48V according to claim 3 intelligent digital current voltmeter of powering, it is characterized in that: described button design modular design setting key, increase key, reduce key three buttons, to be connected with described microprocessor port Pc1, Pc6, Pc7 respectively.
8. the power supply DC48V according to claim 3 intelligent digital current voltmeter of powering, it is characterized in that: described digital display module adopts the positive group of four figures pipe display of LED, described microprocessor Pd6, Pd7 port is directly inputted to 74HC164,74HC164 exports 7 strokes of 8 lines and described charactron and scaling position is connected, each position of described microprocessor Pb4 ~ Pb7 signal Direct driver charactron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420432945.6U CN204101622U (en) | 2014-07-31 | 2014-07-31 | The intelligent digital current voltmeter that a kind of power supply DC48V powers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420432945.6U CN204101622U (en) | 2014-07-31 | 2014-07-31 | The intelligent digital current voltmeter that a kind of power supply DC48V powers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897955A (en) * | 2015-06-26 | 2015-09-09 | 济南中维世纪科技有限公司 | Intelligent current voltmeter |
| CN110514348A (en) * | 2019-09-02 | 2019-11-29 | 武汉松野智能仪表有限公司 | A kind of intelligent digital pressure transmitter circuit |
-
2014
- 2014-07-31 CN CN201420432945.6U patent/CN204101622U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897955A (en) * | 2015-06-26 | 2015-09-09 | 济南中维世纪科技有限公司 | Intelligent current voltmeter |
| CN110514348A (en) * | 2019-09-02 | 2019-11-29 | 武汉松野智能仪表有限公司 | A kind of intelligent digital pressure transmitter circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150114 |