CN204010300U - For the infrared-ray communication circuit of ultrasonic flow meter - Google Patents
For the infrared-ray communication circuit of ultrasonic flow meter Download PDFInfo
- Publication number
- CN204010300U CN204010300U CN201420366295.XU CN201420366295U CN204010300U CN 204010300 U CN204010300 U CN 204010300U CN 201420366295 U CN201420366295 U CN 201420366295U CN 204010300 U CN204010300 U CN 204010300U
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- photodiode
- resistance
- triode
- circuit
- flow meter
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The utility model provides a kind of infrared-ray communication circuit for ultrasonic flow meter, the first photodiode in circuit, the second photodiode optically-coupled, the first photodiode anode is connected with signal input part by the first resistance, the plus earth of the first photodiode, the anode of the second photodiode is by the second resistance eutral grounding, the negative electrode of the second photodiode is connected with power supply by the 3rd resistance, the anode of the second photodiode is also connected with the base stage of triode by the first electric capacity, the grounded emitter of triode, the collector of triode is connected with power supply by the 4th resistance.This telecommunication circuit can effectively prevent daylight or the interference of other light to signal of communication, ensures to communicate by letter normally to carry out in any environment, ensures that ultrasonic flow meter can normally use.
Description
Technical field
The utility model relates to a kind of ultrasonic flow meter, particularly a kind of infrared-ray communication circuit for ultrasonic flow meter.
Background technology
Ultrasonic flow meter is made up of ultrasonic transducer, electronic circuit and flow indication and accumulation system three parts.Ultrasound transmitting transducer converts electrical energy into ultrasonic energy, and is transmitted in detected fluid, the ultrasonic signal that receiver receives, through electronic circuit amplify and be converted to represent flow electric signal supply with show and integrating meter shows and integrating.Detection and the demonstration of flow are so just realized.
The signal circuit using in ultrasonic flow meter is mainly infrared-ray communication circuit, current infrared communication circuit is not generally taked anti-interference process, due to the employing of infrared communication circuit is that photodiode or phototriode communicate, more responsive to infrared ray, and daylight or incandescent lamp etc. have more intense infrared ray, they can be directly photodiode or phototriode conducting, thereby make the conducting of method triode.If while therefore not carrying out anti-interference process, ultrasonic flow meter just cannot communicate sometimes under daylight or incandescent lamp, will affect so the normal use of ultrasonic flow meter.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of infrared-ray communication circuit that can effectively prevent that daylight or incandescent lamp from disturbing.
For achieving the above object and other relevant objects, the utility model provides a kind of infrared-ray communication circuit for ultrasonic flow meter, comprise signal sending circuit and signal receiving circuit, in described signal sending circuit, be provided with the first photodiode, in described signal receiving circuit, be provided with the second photodiode, described the first photodiode, the second photodiode optically-coupled, described the first photodiode anode is connected with signal input part by the first resistance, the plus earth of described the first photodiode, the anode of described the second photodiode is by the second resistance eutral grounding, the negative electrode of described the second photodiode is connected with power supply by the 3rd resistance, the anode of described the second photodiode is also connected with the base stage of triode by the first electric capacity, the grounded emitter of described triode, the collector of described triode is connected with power supply by the 4th resistance.
Preferably, the base stage of described triode also by the 5th resistance be connected with the 3rd resistance, the base stage of triode passes through the 6th resistance eutral grounding.
Preferably, power supply is also connected with a filter circuit of pressure-stabilizing by the 3rd resistance, and described filter circuit of pressure-stabilizing comprises the second electric capacity and the 3rd electric capacity, and after the second electric capacity, the 3rd Capacitance parallel connection, one end is connected with the 3rd resistance, other end ground connection.
As mentioned above, infrared-ray communication circuit tool for ultrasonic flow meter of the present utility model has the following advantages: this telecommunication circuit is provided with the first electric capacity between the second photodiode and the base stage of triode, the first electric capacity can play the galvanic effect that cuts off, receiving when the second photodiode the direct current that daylight or incandescent lamp produce while irradiation like this can be cut off by the first electric capacity, the base stage of triode just can not produce voltage like this, therefore triode just can conducting yet, only just meeting conducting of triode in the time that signal input part has pulse signal input, realize communicating by letter between signal sending circuit and signal receiving circuit, this telecommunication circuit can effectively prevent daylight or the interference of other light to signal of communication as can be seen here, ensure to communicate by letter and can normally carry out in any environment, ensure that ultrasonic flow meter can normally use.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment.
Element numbers explanation: D4, the first photodiode; D5, the second photodiode; R11, the first resistance; R27, the second resistance; R22, the 3rd resistance; R15, the 4th resistance; R28, the 5th resistance; R29, the 6th resistance; Q1, triode; C22, the first electric capacity; C17, the second electric capacity; C18, the 3rd electric capacity.
Embodiment
By specific instantiation, embodiment of the present utility model is described below, those skilled in the art can understand other advantages of the present utility model and effect easily by the disclosed content of this instructions.The utility model can also be implemented or be applied by other different embodiment, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present utility model.
Refer to Fig. 1.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present utility model in a schematic way, satisfy and only show with assembly relevant in the utility model in graphic but not component count, shape and size drafting while implementing according to reality, when its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the utility model provides a kind of infrared-ray communication circuit for ultrasonic flow meter, this communicating circuit comprises signal sending circuit and signal receiving circuit two parts, in signal sending circuit, be provided with the first photodiode D4, the first photodiode D4 anode is connected with signal input part IR-TX by the first resistance R 11, the plus earth of the first photodiode (D4).Signal input part IR-TX input pulse signal makes the first photodiode D4 break-make.In signal receiving circuit, be provided with the second photodiode D5, the first photodiode D4, the second photodiode D5 optically-coupled, the light that the first photodiode D4 sends is received by the second photodiode D5, so just can control the break-make of the second photodiode D5.
The anode of the second photodiode D5 is by the second resistance R 27 ground connection, the negative electrode of the second photodiode D5 is connected with power supply VCC by the 3rd resistance R 22, the anode of the second photodiode D5 is also connected with the base stage of triode Q1 by the first capacitor C 22, the grounded emitter of triode Q1, the collector of triode Q1 is connected with power supply VCC by the 4th resistance R 15, and the collector of triode Q1 forms signal output part IR-RX.
In this circuit, the second resistance R 27 is 3M current-limiting resistance, and VCC is 3V, and under normal circumstances, even if there is strong illumination, the second photodiode D5 conducting can not be greater than 1uA with after-current yet.And the first capacitor C 22 can isolated DC signal, triode Q1 cannot conducting like this.In order to improve the sensitivity of circuit, this circuit is also provided with a bias voltage circuit, it comprises the 5th resistance R 28 and the 6th resistance R 29, the base stage of triode Q1 also by the 5th resistance R 28 be connected with the 3rd resistance R 22, the base stage of triode Q1 is by the 6th resistance R 29 ground connection.The 5th resistance R 28 and the 6th resistance R 29 are respectively 10M and 1.2M resistance, and the magnitude of voltage at triode Q1 base stage place is about 0.32V like this, can ensure triode Q1 in the situation that inputting without external signal in not on-state.
In order to improve the stability of circuit, power supply VCC is also connected with a filter circuit of pressure-stabilizing by the 3rd resistance R 22, filter circuit of pressure-stabilizing comprises that the second capacitor C 17 and the 3rd capacitor C 18, the second capacitor C 17, the 3rd capacitor C 18 rear one end in parallel are connected with the 3rd resistance R 22, other end ground connection.The second capacitor C 17, the 3rd capacitor C 18 can play respectively the effect of voltage stabilizing, filtering.
This telecommunication circuit is provided with the first electric capacity between the second photodiode and the base stage of triode, the first electric capacity can play the galvanic effect that cuts off, receiving when the second photodiode the direct current that daylight or incandescent lamp produce while irradiation like this can be cut off by the first electric capacity, the base stage of triode just can not produce voltage like this, therefore triode just can conducting yet, only just meeting conducting of triode in the time that signal input part has pulse signal input, realize communicating by letter between signal sending circuit and signal receiving circuit, this telecommunication circuit can effectively prevent daylight or the interference of other light to signal of communication as can be seen here, ensure to communicate by letter and can normally carry out in any environment, ensure that ultrasonic flow meter can normally use.So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all can, under spirit of the present utility model and category, modify or change above-described embodiment.Therefore, have in technical field under such as and conventionally know that the knowledgeable modifies or changes not departing from all equivalences that complete under spirit that the utility model discloses and technological thought, must be contained by claim of the present utility model.
Claims (3)
1. the infrared-ray communication circuit for ultrasonic flow meter, comprise signal sending circuit and signal receiving circuit, in described signal sending circuit, be provided with the first photodiode (D4), in described signal receiving circuit, be provided with the second photodiode (D5), described the first photodiode (D4), the second photodiode (D5) optically-coupled, described the first photodiode (D4) anode is connected with signal input part by the first resistance (R11), the plus earth of described the first photodiode (D4), it is characterized in that: the anode of described the second photodiode (D5) is by the second resistance (R27) ground connection, the negative electrode of described the second photodiode (D5) is connected with power supply (VCC) by the 3rd resistance (R22), the anode of described the second photodiode (D5) is also connected with the base stage of triode (Q1) by the first electric capacity (C22), the grounded emitter of described triode (Q1), the collector of described triode (Q1) is connected with power supply (VCC) by the 4th resistance (R15).
2. the infrared-ray communication circuit for ultrasonic flow meter according to claim 1, is characterized in that: the base stage of described triode (Q1) also by the 5th resistance (R28) be connected with the 3rd resistance (R22), the base stage of triode (Q1) passes through the 6th resistance (R29) ground connection.
3. the infrared-ray communication circuit for ultrasonic flow meter according to claim 1, it is characterized in that: power supply (VCC) is also connected with a filter circuit of pressure-stabilizing by the 3rd resistance (R22), described filter circuit of pressure-stabilizing comprises the second electric capacity (C17) and the 3rd electric capacity (C18), the second electric capacity (C17), the 3rd electric capacity (C18) rear one end in parallel are connected with the 3rd resistance (R22), other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420366295.XU CN204010300U (en) | 2014-07-03 | 2014-07-03 | For the infrared-ray communication circuit of ultrasonic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420366295.XU CN204010300U (en) | 2014-07-03 | 2014-07-03 | For the infrared-ray communication circuit of ultrasonic flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204010300U true CN204010300U (en) | 2014-12-10 |
Family
ID=52050268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420366295.XU Expired - Fee Related CN204010300U (en) | 2014-07-03 | 2014-07-03 | For the infrared-ray communication circuit of ultrasonic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204010300U (en) |
-
2014
- 2014-07-03 CN CN201420366295.XU patent/CN204010300U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20210703 |