CN201764976U - Loop-powered-type smart transmitter isolated from site sensor - Google Patents
Loop-powered-type smart transmitter isolated from site sensor Download PDFInfo
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- CN201764976U CN201764976U CN2010205249465U CN201020524946U CN201764976U CN 201764976 U CN201764976 U CN 201764976U CN 2010205249465 U CN2010205249465 U CN 2010205249465U CN 201020524946 U CN201020524946 U CN 201020524946U CN 201764976 U CN201764976 U CN 201764976U
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Abstract
The utility model discloses a loop-powered-type smart transmitter isolated from a site sensor. The loop-powered-type smart transmitter isolated from site sensor is respectively connected with a loop-powered and a sensor; the transmitter comprises two groups of DC/DC transformation power supply units, A/D transformation signal collection units, single-chips, signal isolation units, D/A transmit units and LED display units; the DC/DC transformation power supply units are used for respectively supplying the stabilized voltage power supply which is isolated and rectificated to the A/D transformation signal collection units and the LED display units; the output ports of the A/D transformation signal collection units are connected with the input ports of the signal isolation units and the output ports of the signal isolation units are connected with the input ports of the single-chips; one output port of the single-chips is connected with the LED display units and the other output port is connected with the D/A transmit units. The single-chips and the collection circuit of the site sensor in the loop-powered-type smart transmitter are electrically isolated by the signal isolation units, so that the site interface caused by the sensor and the A/D transformation signal collection units are controlled effectively.
Description
Technical field
The utility model relates to a kind of transmitter, relates in particular to a kind of loop power supply type intelligent transducer of isolating with spot sensor.
Background technology
Transmitter be a kind of be the output of standard electric signal, the perhaps equipment of exporting in the communications protocol mode with physical measurement signal or common electrical conversion of signals.The loop power supply type transmitter of being sold in the market mostly is the intelligent transmitter that has single-chip microcomputer greatly, generally comprises the A/D(analog digital) figure signal collecting unit, single-chip microcomputer, a DC/DC(DC-DC) the conversion power supply unit etc.; Directly be connected between sensor current supply circuit and A/D figure signal collecting unit, thereby the sensor current supply circuit produces A/D figure signal collecting unit and disturbs.Also for directly to be connected, sensor and A/D figure signal collecting unit all produce the received signal of single-chip microcomputer and disturb between A/D figure signal collecting unit and single-chip microcomputer.
Summary of the invention
The utility model provides a kind of variable signal collecting unit and single-chip microcomputer interference-free loop power supply type intelligent transducer of isolating with spot sensor at problems of the prior art.
For achieving the above object, the loop power supply type intelligent transducer that the utility model and spot sensor are isolated, it is connected with sensor with loop power supply respectively, and described transmitter comprises two groups of DC/DC conversion power supply units, A/D figure signal collecting unit, single-chip microcomputer, Signal Spacing unit, D/A transducing unit and led display unit.Wherein, the input end of described two groups of DC/DC conversion power supply units all is connected with loop power supply, wherein the output terminal of one group of DC/DC conversion power supply unit is connected with the input end of A/D figure signal collecting unit, and the output terminal of another group DC/DC conversion power supply unit is connected with led display unit; Another sensor input connection of A/D figure signal collecting unit, its output terminal is connected with Signal Spacing unit input end, and the output terminal of Signal Spacing unit is connected with the input end of single-chip microcomputer; Single-chip microcomputer one output terminal connects led display unit; Another output terminal of single-chip microcomputer is connected with D/A transducing unit input end, and sends pwm signal to the D/A transducing unit; The D/A transducing unit converts the pwm signal that receives to corresponding normalized current signal output.
The output terminal of described Signal Spacing unit is formed two-way electrical isolation circuit with the input end of single-chip microcomputer by optocoupler or magnetic coupling and is connected communication.
In the utility model, described DC/DC conversion power supply unit comprises trigger, isolating transformer, bridge rectifier circuit, filter capacitor, trigger constitutes multivibrator and is connected with the isolating transformer primary coil, the isolating transformer secondary coil is connected with the bridge rectifier circuit that diode is formed, and filter capacitor is in parallel with bridge rectifier circuit.
In the utility model, described D/A transducing unit comprises low-pass filter circuit and negative-feedback circuit, and the low-pass filter circuit input end links to each other with the single-chip microcomputer output terminal, receives the pwm signal of single-chip microcomputer, and the low-pass filter circuit output terminal is connected with the negative-feedback circuit input end; Convert pwm signal to analog level signal by low-pass filter circuit, negative-feedback circuit, again analog level signal is further converted to pairing normalized current signal output.
The utility model adopts above-mentioned structure, and A/D figure signal collecting unit is isolated power supply, effectively eliminates the scene interference that the sensor current supply circuit brings; Led display unit is isolated power supply separately, effectively utilize power, improve the LED display brightness; Adopt the Signal Spacing unit to solve the problem that A/D figure signal collecting unit and single-chip microcomputer intercom mutually, the two-way electrical isolation circuit that optocoupler in the Signal Spacing unit or magnetic coupling are formed makes single-chip microcomputer and spot sensor gather the circuit electrical isolation, effectively suppresses the scene interference that sensor and A/D figure signal collecting unit bring again.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further detailed description.
Fig. 1 is the circuit diagram of the loop power supply type intelligent transducer of the utility model and spot sensor isolation.
Embodiment
As shown in Figure 1, the loop power supply type intelligent transducer that the utility model and spot sensor are isolated, it is connected with sensor with loop power supply respectively, and described transmitter comprises two groups of DC/DC conversion power supply units 1 and 7, A/D figure signal collecting unit 2, Signal Spacing unit 3, single-chip microcomputer 4, D/A transducing unit 5 and led display unit 6.
DC/DC conversion power supply unit 1 or 7: two groups of DC/DC conversion power supply units are isolated voltage of direct-flow voltage regulation and are carried out offering A/D figure signal collecting unit 2 and led display unit 6 uses respectively after the isolation rectification voltage stabilizing from loop power supply.
A/D figure signal collecting unit 2: the simulating signal of receiving sensor output, simulating signal is carried out filtering, amplification, A/D analog to digital conversion, after being isolated, the digital signal after the conversion sends into Signal Spacing unit 3.
Signal Spacing unit 3: by optocoupler or magnetic coupling with sensor acquisition circuit, A/D conversion line and the complete electrical isolation of single-chip microcomputer 4 operation circuits.
Single-chip microcomputer 4: the digital signal that received signal isolated location 3 is sent into, carry out linearization process, the digital signal after will handling is then sent into led display unit and is shown 6, and the pwm signal that processes digital signals into direct ratio is to 5 outputs of D/A transducing unit.
D/A transducing unit 5: be connected with single-chip microcomputer 4, receive pwm signal that single-chip microcomputer 4 sends and this conversion of signals is become analog level signal, again analog level signal is further converted to pairing normalized current signal.
Led display unit 6: by 7 power supplies of DC/DC conversion power supply unit, link to each other, receive the reading scan signal that single-chip microcomputer 4 is sent with single-chip microcomputer 4.
The input end of described two groups of DC/DC conversion power supply units 1,7 all is connected with loop power supply and isolates voltage of direct-flow voltage regulation from it, wherein the output terminal of one group of DC/DC conversion power supply unit 1 is connected with the input end of A/D figure signal collecting unit 2, the output terminal of another group DC/DC conversion power supply unit 7 is connected with led display unit 6, and DC/DC conversion power supply unit 1,7 carries out isolated voltage of direct-flow voltage regulation to offer A/D figure signal collecting unit 2 and led display unit 6 uses respectively after the isolation rectification voltage stabilizing; A/D figure signal collecting unit 2 another sensor input connections, the simulating signal of receiving sensor, and transfer simulating signal to digital signal, its output terminal is connected with Signal Spacing unit 3 input ends; The digital signal that the input end of single-chip microcomputer 4 is connected with the output terminal of Signal Spacing unit 3 and received signal isolated location 3 sends; Single-chip microcomputer 4 one output terminals connect led display unit 6, the digital signal after handling is sent into led display unit 6 show; Single-chip microcomputer 4 another output terminals are connected with D/A transducing unit 5 input ends, and single-chip microcomputer 4 is exported the pwm signal that digital signal processing is directly proportional with it to D/A transducing unit 5; D/A transducing unit 5 receives pwm signal that single-chip microcomputers 4 send and this conversion of signals is become analog level signal, analog level signal is further converted to pairing normalized current signal output again.
The output terminal of described Signal Spacing unit 3 is formed two-way electrical isolation circuit with the input end of single-chip microcomputer 4 by optocoupler or magnetic coupling and is connected communication.
The direct supply of the current supply circuit of 24V is isolated direct supply through DC/DC conversion power supply unit 1 and is offered 2 uses of A/D figure signal collecting unit.DC/DC converting unit 1 comprises by 5 phase inverter U1A-U1E, capacitor C 6, two resistance R 1, the multivibrator that R2 forms, isolating transformer T1, four bridge rectifier circuit and two filter capacitor C1, C5 that diode D1, D3 form.Wherein multivibrator is connected with isolating transformer T1 primary coil, and secondary coil is connected with the bridge rectifier circuit input; And filter capacitor C1, C5 are in parallel with bridge rectifier circuit, and after filtering capacitor C 1, C5 filtering, bridge rectifier circuit is connected with A/D figure signal collecting unit 2.Multivibrator is selected the 74HC family chip, selects suitable oscillation frequency effectively to reduce power consumption, obtains the square wave that dutycycle equates, utilizes phase inverter directly to drive isolating transformer then.Adopt four schottky diodes to form bridge rectifier circuit, schottky diode reduces diode drop, and the method for bridge rectifier is in order effectively to utilize the power reduction loss.Isolating power supply for A/D figure signal collecting unit 2 is to disturb for the scene that effective elimination sensor current supply circuit brings.
The direct supply of the current supply circuit of 24V offers led display unit 6 through DC/DC conversion power supply unit 7 isolated direct supplys and uses.DC/DC conversion power supply unit 7 comprises by 5 phase inverter U2A-U2E, capacitor C 7, two resistance R 3, the multivibrator that R4 forms, isolating transformer T2, four bridge rectifier circuit and filter capacitor C2 that diode D2, D4 form.Wherein multivibrator is connected with isolating transformer T2 primary coil, and secondary coil is connected with the bridge rectifier circuit input; And filter capacitor C2 is in parallel with bridge rectifier circuit, and after 2 filtering of filtering capacitor C, bridge rectifier circuit is connected with led display unit 6.Multivibrator is selected the 74HC family chip, selects suitable oscillation frequency effectively to reduce power consumption, obtains the square wave that dutycycle equates, utilizes phase inverter directly to drive isolating transformer then.Adopt four schottky diodes to form bridge rectifier circuit, schottky diode reduces diode drop, and the method for bridge rectifier is in order effectively to utilize the power reduction loss.
4 communications of A/D figure signal collecting unit 2 and single-chip microcomputer adopt Signal Spacing unit 3 to carry out complete electrical isolation.2 optocoupler U4, U5 in single-chip processor i/o port P5.5 and the Signal Spacing unit 3,4 triode Q1, Q2, Q3, Q4, one side of the two-way communication buffer circuit of 8 resistance R 11, R17, R18, R25, R13, R20, R21, R26 is connected, and an other side is connected with the data I/O port of A/D figure signal collecting unit 2.The former limit of the one-way communication buffer circuit of 1 optocoupler U3 in single-chip microcomputer 4I/O port P5.4 and the Signal Spacing unit 3,2 resistance R 12, R19 is connected, the clock I/O(clock control of an other side and A/D figure signal collecting unit 2) port is connected.Adopt Signal Spacing unit 3 to solve the problem that A/D figure signal collecting unit 2 and single-chip microcomputer 4 intercom mutually, the two-way electrical isolation circuit that optocoupler in the Signal Spacing unit 3 is formed makes single-chip microcomputer 4 and spot sensor gather the circuit electrical isolation, effectively suppresses the scene interference that sensor and A/D figure signal collecting unit 2 bring again.
A/D figure signal collecting unit 2 adopts high-speed, the analog to digital conversion circuit that high-precision a/d converter, high-precision low-power consumption amplifier and low-pass filter are formed.Send into A/D converter after simulating signal amplified by low-pass filter and amplifying circuit filtering, quantize to become digital signal output.The digital signal of the quantification that single-chip microcomputer 4 will receive is carried out the pwm signal (pulse-width-modulating signal) that linearization process Cheng Yuqi is directly proportional, and exports to D/A transducing unit 5 by the I/O port P1.6 of single-chip microcomputer 4.
D/A transducing unit 5 comprises 3 resistance R 5, R8, R40,1 capacitor C 4,1 amplifier U9A, the single order low-pass filter circuit of composition, 6 resistance R 6, R7, R9, R10, R39, R41,3,1 triode of 1 capacitor C, 1 4～20mA normalized current output conversion circuit that amplifier U9B forms.Resistance R 5, R8 form potential-divider network and are connected with single-chip microcomputer 4I/O port P1.6; Resistance R 40, capacitor C 4, formation RC low-pass filter and the voltage follower that amplifier U9A constitutes are connected and form a first-order filtering circuit.First-order filtering circuit outlet inserts the Control of Voltage Current Negative Three-Point Capacitance circuit of being made up of resistance R 7, R9, R41, R40, R39, amplifier U9B, triode Q9 after connecting the RC wave filter that one-level is made up of R6, C3 again.D/A transducing unit 5 receives the pulse-width-modulating signal that single-chip microcomputer 4 sends, this signal is converted to the analog level signal that is directly proportional with it by low-pass filter circuit, and this analog level signal is converted into the output of normalized current signal by 4～20 mA normalized current output conversion circuits.
Led display unit 6 adopts highlighted light-emitting diode display, 8 I/O mouth P4.0-P4.7 of single-chip microcomputer 4 are the segment encode mouth, link to each other with light-emitting diode display by 8 current-limiting resistance R27-R34 respectively, 4 I/O mouth P5.0-P5.3 of single-chip microcomputer 4 are position control mouth, link to each other with led display unit 6 by 4 current-limiting resistance R35-R38,4 triode Q5-Q8.Select high-brightness LED to be convenient to low current and drive, and any environment shows that all energy is clear.
Claims (4)
1. loop power supply type intelligent transducer of isolating with spot sensor, it is connected with sensor with loop power supply respectively, it is characterized in that: described transmitter comprises two groups of DC/DC conversion power supply units, A/D figure signal collecting unit, single-chip microcomputer, the Signal Spacing unit, D/A transducing unit and led display unit, wherein, the input end of described two groups of DC/DC conversion power supply units all is connected with loop power supply, wherein the output terminal of one group of DC/DC conversion power supply unit is connected with the input end of A/D figure signal collecting unit, and the output terminal of another group DC/DC conversion power supply unit is connected with led display unit; Another sensor input connection of A/D figure signal collecting unit, its output terminal is connected with Signal Spacing unit input end, and the output terminal of Signal Spacing unit is connected with the input end of single-chip microcomputer; Single-chip microcomputer one output terminal connects led display unit; Another output terminal of single-chip microcomputer is connected with D/A transducing unit input end, and sends pwm signal to the D/A transducing unit; The D/A transducing unit converts the pwm signal that receives to corresponding normalized current signal output.
2. loop power supply type intelligent transducer of isolating with spot sensor according to claim 1, it is characterized in that: the output terminal of described Signal Spacing unit is formed two-way electrical isolation circuit with the input end of single-chip microcomputer by optocoupler or magnetic coupling and is connected communication.
3. loop power supply type intelligent transducer of isolating according to claim 1 with spot sensor, it is characterized in that: described DC/DC conversion power supply unit comprises trigger, isolating transformer, bridge rectifier circuit, filter capacitor, trigger constitutes multivibrator and is connected with the isolating transformer primary coil, the isolating transformer secondary coil is connected with the bridge rectifier circuit that diode is formed, and filter capacitor is in parallel with bridge rectifier circuit.
4. loop power supply type intelligent transducer of isolating according to claim 1 with spot sensor, it is characterized in that: described D/A transducing unit comprises low-pass filter circuit and negative-feedback circuit, the low-pass filter circuit input end links to each other with the single-chip microcomputer output terminal, receive the pwm signal of single-chip microcomputer, the low-pass filter circuit output terminal is connected with the negative-feedback circuit input end; Convert pwm signal to analog level signal by low-pass filter circuit, negative-feedback circuit, again analog level signal is further converted to pairing normalized current signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205249465U CN201764976U (en) | 2010-09-10 | 2010-09-10 | Loop-powered-type smart transmitter isolated from site sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205249465U CN201764976U (en) | 2010-09-10 | 2010-09-10 | Loop-powered-type smart transmitter isolated from site sensor |
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| Publication Number | Publication Date |
|---|---|
| CN201764976U true CN201764976U (en) | 2011-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205249465U Expired - Lifetime CN201764976U (en) | 2010-09-10 | 2010-09-10 | Loop-powered-type smart transmitter isolated from site sensor |
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| Country | Link |
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| CN (1) | CN201764976U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103491138A (en) * | 2013-09-03 | 2014-01-01 | 洛阳翔霏机电科技有限责任公司 | Enterprise real-time information system |
| CN112526200A (en) * | 2020-11-11 | 2021-03-19 | 西安爱科赛博电气股份有限公司 | High-precision high-dynamic isolation type voltage transmitter |
-
2010
- 2010-09-10 CN CN2010205249465U patent/CN201764976U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103491138A (en) * | 2013-09-03 | 2014-01-01 | 洛阳翔霏机电科技有限责任公司 | Enterprise real-time information system |
| CN112526200A (en) * | 2020-11-11 | 2021-03-19 | 西安爱科赛博电气股份有限公司 | High-precision high-dynamic isolation type voltage transmitter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110316 |