CN202153236U - Measuring conversion circuit for sensor - Google Patents
Measuring conversion circuit for sensor Download PDFInfo
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- CN202153236U CN202153236U CN2011202507099U CN201120250709U CN202153236U CN 202153236 U CN202153236 U CN 202153236U CN 2011202507099 U CN2011202507099 U CN 2011202507099U CN 201120250709 U CN201120250709 U CN 201120250709U CN 202153236 U CN202153236 U CN 202153236U
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- sampling resistor
- wire system
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Abstract
The utility model discloses a measuring conversion circuit for a sensor, wherein the sensor is a two-wire system or four-wire system sensor, the measuring conversion circuit comprises a current limiting circuit, a gating unit, a sampling resistor and an AD conversion unit, the gating unit is respectively connected with the first end of the sensor, the current limiting circuit, the first end of the sampling resistor and the ground, the second end of the sensor is connected with the second end of the sampling resistor, the AD conversion unit is connected with both ends of a sampling circuit in parallel, when the sensor is a two-wire system sensor the gating unit is used for enabling the power supply loop of the current circuit, the sensor, the sampling resistor and the ground to be conductive, and when the sensor is a four-wire system sensor the gating unit is used for enabling the power supply loop of the sensor and the sampling resistor to be conductive. The measuring conversion circuit for a sensor realizes the dynamic multiplexing of the input terminal of the two-wire system and the four-wire system sensor, thereby enabling users to flexibly configure the sensor, and preventing equipment damage such as sensor and line fault, etc., caused by maloperation of users.
Description
Technical field
The utility model relates to the signals collecting field of measuring technique of sensor, particularly the measurement change-over circuit of sensor.
Background technology
At present, gathering the current sensor signal universal mode is a kind of sampling resistor of series connection in the sensor current supply circuit, converts current signal to voltage signal, converts digital signal to through analog to digital converter, carries out post-processed then.
The kind of sensor is a lot, but the current signal interface of sensor is mainly 2 line systems and 4 line system modes.Since traditional current acquisition circuit can only be separately to 4 line system current sensors perhaps the stationary conduit of 2 line system current sensors carry out signals collecting; Usually the 2 and 4 wire sensor combinations all can't satisfy the combination of channels requirement of on-the-spot circuit; And there is very big potential safety hazard in the mode of connection of change sensor, has brought inconvenience to the user.For example, when 2 line system sensors were changed to 4 line system sensors, the terminal user was difficult to accomplish 2 line system sensors are carried out overcurrent protection usually, and caused sensor to damage.
In view of this, the utility model provides a kind of free handover measurement change-over circuit of on fixing input terminal, realizing 2 line systems or 4 line system current sensor input signals.
Summary of the invention
In view of the weak point of above-mentioned prior art, the utility model provides a kind of measurement change-over circuit of sensor, to solve the interface diversity of current sensor in the prior art, the problem of the replacing sensor inconvenience of distinct interface.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of measurement change-over circuit of sensor, said sensor are two-wire system or four-wire system sensor, and said measurement change-over circuit comprises current-limiting circuit, gating unit, sampling resistor and AD conversion unit; Said gating unit is connected with ground with first end of first end of sensor, current-limiting circuit, sampling resistor respectively, and second end of said sensor is connected with second end of sampling resistor; Said AD conversion unit is attempted by the two ends of sample circuit; Wherein, when said sensor was the two-wire system sensor, said gating unit was used for the current supply circuit between conducting current-limiting circuit, sensor, sampling resistor and the ground; When said sensor was the four-wire system sensor, said gating unit was used for the current supply circuit of conducting sensor and sampling resistor.
The measurement change-over circuit of described sensor, wherein, said gating unit is a double-point double-throw switch, wherein, the double-throw head of said double-point double-throw switch is connected with first end of sensor and first end of sampling resistor respectively.
The measurement change-over circuit of described sensor, wherein, said gating unit is relay or electronic switch.
Compared with prior art, the beneficial effect of the utility model is: when circuit adopts the two-wire system sensor, through the current supply circuit between gating unit conducting current-limiting circuit, sensor, sampling resistor and the ground; When circuit adopts the four-wire system sensor, the current supply circuit of gating unit conducting sensor and sampling resistor, thus realize that 2 line systems and 4 line system sensor input terminals are multiplexing dynamically; The user can be disposed sensor flexibly; Avoid changing circuit design, and when switching 2 line system current sensors, have holding circuit in the measurement change-over circuit because of the kind collocation of sensor; Can avoid because of user error operation, the device damage that causes sensor, line fault etc. to cause.
Description of drawings
The measurement converting circuit structure block diagram that Fig. 1 provides for the utility model embodiment.
The measurement change-over circuit schematic diagram that Fig. 2 provides for the utility model embodiment.
Fig. 3 provides the circuit diagram of gating unit conducting in the measurement change-over circuit of 2 line system sensors for the utility model embodiment.
Fig. 4 provides the circuit diagram of gating unit conducting in the measurement change-over circuit of 4 line system sensors for the utility model embodiment.
Embodiment
The utility model provides a kind of measurement change-over circuit of sensor; Adopt the form of selecting conducting through switching on and off relevant circuit dynamically; On fixing input terminal, realize freely switching of 2 line systems or 4 line system current sensor input signals; Thereby the user can realize the combination in any of current sensor in limited number of active lanes.Simultaneously, the utility model also provides various protections to the working power of 2 line system sensors, prevents because the user error operation causes device damage.
For the purpose, technical scheme and the effect that make the utility model is clearer, clear and definite, below with reference to accompanying drawing and give an actual example to the utility model further explain.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 1, the measurement change-over circuit of the sensor that the utility model embodiment provides comprises sensor 11, current-limiting circuit 12, gating unit 13, sampling resistor R1 and AD conversion unit 14.Said gating unit 13 is connected with ground with first end of first end of sensor 11, current-limiting circuit 12, sampling resistor R1 respectively, and second end of said sensor 11 is connected with second end of sampling resistor R1.
Said AD conversion unit 14 is attempted by the two ends of sampling resistor R1; Be used for the signal at sampling resistor R1 two ends is carried out analog to digital conversion; Wherein, the signal of sampling resistor R1 first end is positive voltage signal ADC+, and the signal of second end of sampling resistor R1 is negative voltage signal ADC-.
Among the utility model embodiment; Said sensor 11 is two-wire system or four-wire system sensor; When sensor adopts the two-wire system sensor; Said gating unit 13 is used for the current supply circuit between conducting current-limiting circuit 12, sensor 11, sampling resistor R1 and the ground, and when sensor adopted the four-wire system sensor, said gating unit 13 was used for the current supply circuit of conducting sensor 11 and sampling resistor R1.
Wherein, said gating unit 13 is double-point double-throw switch, relay, electronic switch or mechanical switch.Present embodiment is preferably double-point double-throw switch, and is as shown in Figure 2.The double-throw head of said double-point double-throw switch is connected with first end of sensor 11 and first end of sampling resistor R1 respectively, and the selecting side of double-point double-throw switch is used for four connection terminals 1,2,3,4 of selecting turn-on power to survey according to type of sensor.
Below to be the application implementation example with two-wire system sensor 11 and four-wire system sensor 11 be elaborated to the selection conduction mode of double-point double-throw switch:
Please consult Fig. 2 and Fig. 3 in the lump, when equipment adopted two-wire system sensor 11, the input signal that double-point double-throw switch receives was 2 line system current sensor signal; Then double-point double-throw switch is selected conducting 2,4 these two connection terminals; At this moment, the power supply VCC of 24V gets into sensor 11 through after the current-limiting circuit 12 along the path shown in Fig. 3 dotted line; And give sensor 11 power supplies; Sensor 11 produces the current corresponding signals and inserts power supply negative terminal after through sampling resistor R1, thereby constitutes a complete loop, and this moment is through measuring the size that voltage on the sampling resistor R1 just can converse electric current.
When sensor 11 breaks down (for example short circuit), can protect through 12 pairs of two-wire system sensors 11 of said current-limiting circuit, thereby can effectively avoid the device damage and the security incident of producing because of electric current is excessive.
Please consult Fig. 2 and Fig. 4 in the lump, when equipment adopted the four-wire system sensor, the input signal that double-point double-throw switch receives was the four-wire system current sensor signal; Double-point double-throw switch is selected conducting 1,3 these two terminals; At this moment, the marking current of sensor 11 flows out from first end of sensor, along path shown in dotted lines in Figure 4; Behind sampling resistor R1; Get into sensor from second end of sensor 11, thereby constitute a complete current return, just can converse the size of electric current this moment through the voltage on the measurement sampling resistor R1.
It is thus clear that; The utility model has been realized the switching of the signal of 2 and 4 wire system current sensor on a pair of input terminal; And the power supply of 2 line system current sensors and protection; Solve the interface diversity of industry spot current sensor, cause the inconvenient difficult problem of replacing sensor of distinct interface, reduce user's technical requirement in use.
Should be noted that the measurement change-over circuit that the utility model embodiment provides, also can be used for the measurement of the transmitter of two-wire system or four-wire system, make the user can dispose transmitter more flexibly, be with convenience for user's operation.
In sum; The utility model has realized that 2 line systems and 4 line system sensor input terminals are multiplexing dynamically, and the user can be disposed sensor flexibly, has avoided changing circuit design because of the kind collocation of sensor; And when switching 2 system line current sensors; Have current-limiting circuit in the measurement change-over circuit, avoided because of user error operation, the device damage that causes sensor, line fault etc. to cause.
It is understandable that; Concerning those of ordinary skills; Can be equal to replacement or change according to the technical scheme and the utility model design thereof of the utility model, and all these changes or replacement all should belong to the protection domain of the appended claim of the utility model.
Claims (3)
1. the measurement change-over circuit of a sensor, said sensor is two-wire system or four-wire system sensor, it is characterized in that, said measurement change-over circuit comprises current-limiting circuit, gating unit, sampling resistor and AD conversion unit; Said gating unit is connected with ground with first end of first end of sensor, current-limiting circuit, sampling resistor respectively, and second end of said sensor is connected with second end of sampling resistor; Said AD conversion unit is attempted by the two ends of sample circuit; Wherein, when said sensor was the two-wire system sensor, said gating unit was used for the current supply circuit between conducting current-limiting circuit, sensor, sampling resistor and the ground; When said sensor was the four-wire system sensor, said gating unit was used for the current supply circuit of conducting sensor and sampling resistor.
2. the measurement change-over circuit of sensor according to claim 1 is characterized in that, said gating unit is a double-point double-throw switch, and wherein, the double-throw head of said double-point double-throw switch is connected with first end of sensor and first end of sampling resistor respectively.
3. the measurement change-over circuit of sensor according to claim 1 is characterized in that, said gating unit is relay or electronic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507099U CN202153236U (en) | 2011-07-15 | 2011-07-15 | Measuring conversion circuit for sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202507099U CN202153236U (en) | 2011-07-15 | 2011-07-15 | Measuring conversion circuit for sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202153236U true CN202153236U (en) | 2012-02-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202507099U Expired - Fee Related CN202153236U (en) | 2011-07-15 | 2011-07-15 | Measuring conversion circuit for sensor |
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| CN (1) | CN202153236U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2814178A1 (en) * | 2013-06-11 | 2014-12-17 | Siemens Aktiengesellschaft | Analog input assembly |
| CN104471412A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and apparatus of identifying or locating current sensors |
| CN108348715A (en) * | 2015-11-13 | 2018-07-31 | 欧根·卡根 | Lung ventilator |
| CN108536637A (en) * | 2018-04-24 | 2018-09-14 | 姜黎 | A kind of communication system and method for transmitter conditioning chip |
| CN113390527A (en) * | 2020-03-12 | 2021-09-14 | 杭州释普科技有限公司 | Low-power consumption bluetooth supervisory equipment and 4-wire system PT100 measuring circuit thereof |
-
2011
- 2011-07-15 CN CN2011202507099U patent/CN202153236U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104471412A (en) * | 2012-07-20 | 2015-03-25 | 伊顿公司 | Method and apparatus of identifying or locating current sensors |
| CN104471412B (en) * | 2012-07-20 | 2018-11-09 | 伊顿公司 | The method and apparatus of identification or location current sensor |
| EP2814178A1 (en) * | 2013-06-11 | 2014-12-17 | Siemens Aktiengesellschaft | Analog input assembly |
| CN104238401A (en) * | 2013-06-11 | 2014-12-24 | 西门子公司 | Analog input module |
| US9271072B2 (en) | 2013-06-11 | 2016-02-23 | Siemens Aktiengesellschaft | Analog input module |
| CN104238401B (en) * | 2013-06-11 | 2018-02-16 | 西门子公司 | Analog input module |
| CN108348715A (en) * | 2015-11-13 | 2018-07-31 | 欧根·卡根 | Lung ventilator |
| CN108348715B (en) * | 2015-11-13 | 2021-03-19 | 欧根·卡根 | Breathing machine |
| CN108536637A (en) * | 2018-04-24 | 2018-09-14 | 姜黎 | A kind of communication system and method for transmitter conditioning chip |
| CN108536637B (en) * | 2018-04-24 | 2021-07-02 | 杭州芯声智能科技有限公司 | Communication system and method for transmitter conditioning chip |
| CN113390527A (en) * | 2020-03-12 | 2021-09-14 | 杭州释普科技有限公司 | Low-power consumption bluetooth supervisory equipment and 4-wire system PT100 measuring circuit thereof |
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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 |
Granted publication date: 20120229 Termination date: 20180715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |