CN200990142Y - Voltage current collecting channel circuit - Google Patents
Voltage current collecting channel circuit Download PDFInfo
- Publication number
- CN200990142Y CN200990142Y CN 200620015971 CN200620015971U CN200990142Y CN 200990142 Y CN200990142 Y CN 200990142Y CN 200620015971 CN200620015971 CN 200620015971 CN 200620015971 U CN200620015971 U CN 200620015971U CN 200990142 Y CN200990142 Y CN 200990142Y
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- Prior art keywords
- voltage
- acquisition channel
- current
- electric current
- channel circuit
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Abstract
The utility model provides a voltage-current collecting channel circuit which comprises a collecting circuit positioned between the signal line of a collecting channel and an analog ground which is composed of a bidirectional option switch, a current sampling resistance and a voltage sampling resistance; wherein, one end of the current sampling resistance and one end of the voltage sampling resistance are respectively connected with the bidirectional ends of the bidirectional option switch and the other end of the current sampling resistance and the other end of the voltage sampling resistance are in mutually electric connection. The utility model also comprises a PTC thermistance which is connected in series with the input end of the signal line of the collecting channel. The utility model has the advantages of that when a voltage signal is mistakenly inserted under a current signal input mode, the current sampling resistance of the collecting channel circuit is prevented from burning and other electronic components in the collecting channel circuit also is prevented from lightning strikes.
Description
[technical field]
The utility model relates to the industry control data collecting field, relates in particular to a kind of electric current and voltage acquisition channel circuit that is used to monitor collector.
[background technology]
The acquisition channel of monitoring collector is used for external various sensor, and sensor output has voltage-type and current mode, so the acquisition channel needs of monitoring collector can adapt to this two kinds of output forms.
Traditional acquisition channel circuit as shown in Figure 1, jumper wire device K11, current sampling resistor R21 and voltage sample resistance R 31 formed sample circuits.As the input end of current-limiting resistance R4 1 in No. 1 terminated signal lines of the jumper wire device K11 of two-way choice switch, wire jumper end 2 and 3 connects simulation ground by current sampling resistor R21 and voltage sample resistance R 31 respectively.Output termination A/D modular converter and the filter capacitor C1 1 of current-limiting resistance R41; The A/D modular converter and the filter capacitor C11 other end are connected to simulation ground.
When acquisition channel circuit collection shown in Figure 1 and measurement electric current, external is amperometric sensor, and sensor is output as current signal (the general usable range of industry control is 4-20mA).Wire jumper 1,2 short circuits in the sample circuit insert sample circuit with current sampling resistor R21, carry out current signals and measurement.When collection and measuring voltage, external is voltage sensor, the voltage signal (the general usable range of industry control is 0-10V or 0-5V) of sensor output.Wire jumper 2,3 short circuits in the sample circuit.Voltage sample resistance R 31 is inserted sample circuit, carry out the collection and the measurement of voltage signal.
Wire jumper needs manually-operated, unavoidably the situation that can occur mispluging.When the mode of operation of jumper wire device is that the current signal input pattern is when mispluging into voltage signal, because voltage sensor output is up to the voltage signal of 10V, because the resistance of current sampling resistor R21 is very little, flow through the current surge of current sampling resistor R21, current sampling resistor R21 heating is burnt out.
Simultaneously, the lightning protection capability of existing electric current and voltage acquisition channel circuit is not strong, is difficult to take precautions against macro-energy invasions such as thunderbolt, causes monitoring collector and acquisition channel circuit to damage.
[utility model content]
The technical problems to be solved in the utility model provides a kind of electric current and voltage acquisition channel circuit that also can not cause damage into voltage signal that misplugs under the current signal input pattern.
The technical matters that the utility model further will solve provides a kind of can the protection and monitors collector and the not impaired electric current and voltage acquisition channel of acquisition channel circuit circuit when thunderbolt.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of electric current and voltage acquisition channel circuit, comprise the Acquisition Circuit between the signal wire that is connected acquisition channel and the simulation ground, described Acquisition Circuit comprises two-way choice switch, current sampling resistor and voltage sample resistance; Wherein an end of current sampling resistor and voltage sample resistance is connected on the two-way end of two-way choice switch respectively, and the other end is electrically connected mutually; Also comprise the PTC thermistor that is serially connected in acquisition channel signal wire input end.
Above-described electric current and voltage acquisition channel circuit preferably also comprises the discharge tube between the input end that is connected signal wire and the protection ground.
Above-described electric current and voltage acquisition channel circuit can also comprise that being connected signal wire PTC thermistor suppresses diode away from an end of signal input part and the transient state bi-directional voltage between the simulation ground.
Above-described electric current and voltage acquisition channel circuit can also comprise the magnetic bead that is serially connected in the signal wire; One termination PTC thermistor of described magnetic bead and transient state bi-directional voltage suppress the node between the diode, another termination Acquisition Circuit.
The utility model electric current and voltage acquisition channel circuit is owing to sealed in the PTC thermistor in the signal wire of acquisition channel, when the input signal types of the wire jumper pattern of Acquisition Circuit and sensor does not match, along with the electric current in the acquisition channel signal wire increase to the breakover current of PTC thermistor the time, the PTC thermistor is high-impedance state, makes that the electric current in this passage reduces rapidly.The access of PTC thermistor not only can protect the current sampling resistor of Acquisition Circuit not burnt out, and can also protect other electrical equipments in the acquisition channel circuit when thunderbolt.
The utility model electric current and voltage acquisition channel circuit is as further connecting a discharge tube between the input end of signal wire and protection ground; when thunderbolt is invaded; not only the PTC thermistor is along with the increase of electric current in the acquisition channel can be high-impedance state; rapidly the dangerous currents in this passage is reduced; and discharge tube can be rapidly by protection most of energy of the thunderbolt of releasing, the acquisition channel circuit is protected fully.
[description of drawings]
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the circuit theory diagrams of prior art electric current and voltage acquisition channel circuit.
Fig. 2 is the circuit theory diagrams of the utility model electric current and voltage acquisition channel circuit embodiments 1.
Fig. 3 is the circuit theory diagrams of the utility model electric current and voltage acquisition channel circuit embodiments 2.
[embodiment]
In the utility model electric current and voltage acquisition channel circuit embodiments 1 shown in Figure 2, between No. 1 end of tradition input end and two-way choice K switch 11; Discharge tube SP11 is connected between signal line input end and the protection ground; The transient state bi-directional voltage suppresses the node P11 between diode TVS11 one termination PTC thermistor R11 and the magnetic bead L11, another termination simulation ground.
Current sampling resistor R21 is a precision resistance, and in the present embodiment, current sampling resistor R21 is 249 Europe. voltage sample resistance R 31 is selected general resistance, and in the present embodiment, voltage sample resistance R 31 is 4.7 kilo-ohms.
When wire jumper is that current forms is about to wire jumper 1,2 short circuits but by mistake during input voltage signal, the electric current that flows through current sampling resistor R21 will be multiplied, and meanwhile, the electric current that flows through PTC thermistor R11 also increases thereupon.When the breakover current that surpasses PTC thermistor R11/voltage, the electric current that flows through PTC thermistor R11 reduces rapidly along with the increase of the voltage at its two ends, arrive its action current after PTC thermistor R11 be high-impedance state, be equivalent to after the action disconnect.Like this, current sampling resistor R21 is excess current momently only, and PTC thermistor R11 just begins action, cuts off the electric current of current sampling resistor R21, and it can not burnt out because of long-time excess current.
In addition, in the present embodiment, if thunderbolt is arranged invades, discharge tube SP11 and transient state bi-directional voltage suppress the lightning protection capability that diode TVS11 can provide 3KA, the surge impact energy of thunderbolt after discharge tube SP11 and transient state bi-directional voltage suppress diode TVS11 two-stage and release, safety before entering Acquisition Circuit.When thunderbolt is invaded, the metering function of PTC thermistor R11, the energy that helps discharge tube SP11 is released.Magnetic bead L11 further releases in the acquisition channel owing to the excess energy that thunderbolt brings, also have the effect of filtering except that cooperating the transient state bi-directional voltage to suppress diode TVS11, and being unfavorable in the filtering acquired signal monitored the signal of collector measurement.
In the utility model electric current and voltage acquisition channel circuit embodiments 2 shown in Figure 3, three utmost point discharge tube SP21, two input ends are connected respectively to the signal wire of acquisition channel CH1 and the signal wire of acquisition channel CH2, and output terminal is connected to protection ground.Saved a discharge tube like this, and circuit structure is simplified.
The utility model suppresses diode with discharge tube, PTC thermistor, transient state bi-directional voltage and is used, and has guaranteed that electric current and voltage acquisition channel circuit has anti-mis-insertion and anti-lightning strike dual-use function.
Claims (4)
1. electric current and voltage acquisition channel circuit comprises the signal wire that is connected acquisition channel and the Acquisition Circuit between the simulation ground, and described Acquisition Circuit comprises two-way choice switch, current sampling resistor and voltage sample resistance; Wherein an end of current sampling resistor and voltage sample resistance is connected on the two-way end of two-way choice switch respectively, and the other end is electrically connected mutually; It is characterized in that, also comprise the PTC thermistor that is serially connected in acquisition channel signal wire input end.
2. electric current and voltage acquisition channel circuit according to claim 1 is characterized in that, also comprises the discharge tube between the input end that is connected signal wire and the protection ground.
3. electric current and voltage acquisition channel circuit according to claim 2 is characterized in that, comprises that also being connected signal wire PTC thermistor suppresses diode away from an end of signal input part and the transient state bi-directional voltage between the simulation ground.
4. electric current and voltage acquisition channel circuit according to claim 3 is characterized in that, also comprises the magnetic bead that is serially connected in the signal wire; One termination PTC thermistor of described magnetic bead and transient state bi-directional voltage suppress the node between the diode, another termination Acquisition Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015971 CN200990142Y (en) | 2006-11-23 | 2006-11-23 | Voltage current collecting channel circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620015971 CN200990142Y (en) | 2006-11-23 | 2006-11-23 | Voltage current collecting channel circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200990142Y true CN200990142Y (en) | 2007-12-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620015971 Expired - Lifetime CN200990142Y (en) | 2006-11-23 | 2006-11-23 | Voltage current collecting channel circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200990142Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199168A (en) * | 2016-08-16 | 2016-12-07 | 江苏科技大学 | A kind of multifunctional electric current acquisition system for single-chip microcomputer |
| CN106291183A (en) * | 2016-08-04 | 2017-01-04 | 国网天津市电力公司 | A kind of anti-interference multi-band signal harvester |
| CN113325742A (en) * | 2021-04-14 | 2021-08-31 | 珠海派诺科技股份有限公司 | Analog signal control circuit for motor protector |
-
2006
- 2006-11-23 CN CN 200620015971 patent/CN200990142Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291183A (en) * | 2016-08-04 | 2017-01-04 | 国网天津市电力公司 | A kind of anti-interference multi-band signal harvester |
| CN106199168A (en) * | 2016-08-16 | 2016-12-07 | 江苏科技大学 | A kind of multifunctional electric current acquisition system for single-chip microcomputer |
| CN106199168B (en) * | 2016-08-16 | 2019-08-09 | 江苏中海重型机床有限公司 | A kind of multifunctional electric current acquisition system for single-chip microcontroller |
| CN113325742A (en) * | 2021-04-14 | 2021-08-31 | 珠海派诺科技股份有限公司 | Analog signal control circuit for motor protector |
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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 |
Granted publication date: 20071212 |
|
| EXPY | Termination of patent right or utility model |