阅读说明：本技术 一种电流采集装置 (A kind of current collecting device ) 是由 范福基 黄玲 李蒙 于 2019-08-27 设计创作，主要内容包括：本申请公开了一种电流采集装置,包括：用于将输入至电流采集装置本体的目标电流进行分压,得到2N+1个电压值的分压模块；与分压模块相连,用于分别对2N+1个电压值进行信号放大,得到2N+1个放大信号的差值放大模块；与差值放大模块相连,用于按照预设转换标准分别对2N+1个放大信号进行模数转换,得到2N+1个转换信号的转换器；与转换器相连,用于当2N+1个转换信号中存在大于或等于N+1个信号值均相等的目标转换信号时,则将目标转换信号所对应的电流值判定为电流采集装置本体的采集电流的控制器；其中,N≥1,差值放大模块为基于分压模块的分压原理,能够将分压模块所输出的2N+1个电压值放大为2N+1个放大信号均相等的放大模块。通过该电流采集装置可以相对提高采集电流的准确性与可靠性。(This application discloses a kind of current collecting devices, comprising: for dividing the target current for being input to current collecting device ontology, obtains the division module of 2N+1 voltage value；It is connected with division module, for carrying out signal amplification to 2N+1 voltage value respectively, obtains the difference amplification module of 2N+1 amplified signal；It is connected with difference amplification module, for carrying out analog-to-digital conversion to 2N+1 amplified signal respectively according to default transfer standard, obtains the converter of 2N+1 conversion signal；It is connected with converter, for when in 2N+1 conversion signal in the presence of the target conversion signal being equal more than or equal to N+1 signal value, then current value corresponding to target conversion signal to be determined as to the controller of the acquisition electric current of current collecting device ontology；Wherein, N >=1, difference amplification module are the voltage divider principle based on division module, and the 2N+1 voltage value that can be exported division module is enlarged into the amplification module that 2N+1 amplified signal is equal.It can the opposite accuracy and reliability for improving acquisition electric current by the current collecting device.)

1. a kind of current collecting device characterized by comprising for the target current of current collecting device ontology will to be input to It is divided, is obtained_2N+1The division module of a voltage value；It is connected with the division module, for right respectively_2N+1A voltage value into The amplification of row signal, obtains_2N+1The difference amplification module of a amplified signal；It is connected with the difference amplification module, for according to pre- If transfer standard is right respectively_2N+1A amplified signal carries out analog-to-digital conversion, obtains_2N+1The converter of a conversion signal；With the conversion Device is connected, for working as_2N+1Exist in a conversion signal and is greater than or equal to_N+1When the target conversion signal that a signal value is equal, then Current value corresponding to the target conversion signal is determined as to the controller of the acquisition electric current of the current collecting device ontology； Wherein,_N≥1, the difference amplification module is the voltage divider principle based on the division module, can be exported the division module 's_2N+1A voltage value is enlarged into_2N+1The amplification module that a amplified signal is equal.

2. current collecting device according to claim 1, which is characterized in that the division module includes:

For dividing the target current for being input to the current collecting device ontology, the first voltage value, are obtained The resistor voltage divider circuit of two voltage values and third voltage value.

3. current collecting device according to claim 2, which is characterized in that the difference amplification module includes:

For carrying out signal amplification to the first voltage value, the first difference amplifier of the first amplified signal is obtained；

For carrying out signal amplification to the second voltage value, the second difference amplifier of the second amplified signal is obtained；

For carrying out signal amplification to the third voltage value, the third difference amplifier of third amplified signal is obtained.

4. current collecting device according to claim 3, which is characterized in that the converter includes:

For carrying out analog-to-digital conversion to first amplified signal according to the default transfer standard, the first conversion signal is obtained First ADC；

For carrying out analog-to-digital conversion to second amplified signal according to the default transfer standard, the second conversion signal is obtained 2nd ADC；

For carrying out analog-to-digital conversion to the third amplified signal according to the default transfer standard, third conversion signal is obtained 3rd ADC.

5. current collecting device according to claim 4, which is characterized in that further include:

The first isolating chip being isolated for the supply voltage to the first ADC and the controller；

The second isolating chip being isolated for the supply voltage to the 2nd ADC and the controller；

The third isolating chip being isolated for the supply voltage to the 3rd ADC and the controller.

6. current collecting device according to claim 5, which is characterized in that first isolating chip and/or described Two isolating chips and/or the third isolating chip are specially optocoupler or magnetic coupling.

7. current collecting device according to claim 4, which is characterized in that further include:

The first digital detection signal sent for receiving the controller, is converted to first for first digital detection signal Analog signal, and first analog signal is sent to the controller by the first ADC, so that the controller pair First digital detection signal carries out the first DAC of self-test；

The second digital detection signal sent for receiving the controller, is converted to second for second digital detection signal Analog signal, and second analog signal is sent to the controller by the 2nd ADC, so that the controller pair Second digital detection signal carries out the 2nd DAC of self-test；

The third digital detection signal sent for receiving the controller, is converted to third for the third digital detection signal Analog signal, and the third analog signal is sent to the controller by the 3rd ADC, so that the controller pair The third digital detection signal carries out the 3rd DAC of self-test.

8. current collecting device according to any one of claims 1 to 7, which is characterized in that the controller is specially to collect At the controller for having MCU and FPGA.

Technical field

The present invention relates to Signal Collection Technology field, in particular to a kind of current collecting device.

Background technique

With the continuous social and economic development, application of the current collecting device in industrial automation is more and more wider It is general.Currently, current collecting device used in the market is usually to be made of Acquisition Circuit all the way, electricity thus just not can guarantee Flow the accuracy of acquisition device collection result.In the case, in order to improve the reliability that current collecting device acquires electric current, lead to Two current collecting devices can often be carried out to parallel connection, and same sampling resistor is set in the front end of two current collecting devices, Collected current signal is converted to voltage signal using sampling resistor, and carry out with this electric current at Collecting operation scene.But It is that at Collecting operation scene during electric current, if sampling resistor resistance value is drifted about, can not determine the two electric currents Which is correct acquisition electric current on earth in acquisition device, thus just not can guarantee the accuracy and reliability of acquisition electric current. Currently, being directed to this technical problem, there are no more effective solution methods.

It is ability it can be seen that how to improve the accuracy and reliability when electric current is acquired in operation field Field technique personnel technical problem urgently to be resolved.

Summary of the invention

In view of this, the purpose of the present invention is to provide a kind of current collecting device, to further increase existing to operation Accuracy and reliability when electric current is acquired in.Its concrete scheme is as follows:

A kind of current collecting device, comprising: for the target current for being input to current collecting device ontology to be divided, Obtain the division module of 2N+1 voltage value；It is connected with the division module, for carrying out signal to 2N+1 voltage value respectively Amplification, obtains the difference amplification module of 2N+1 amplified signal；It is connected with the difference amplification module, for according to default conversion Standard carries out analog-to-digital conversion to 2N+1 amplified signal respectively, obtains the converter of 2N+1 conversion signal；With the converter It is connected, for when there is the target conversion signal being equal more than or equal to N+1 signal value in 2N+1 conversion signal, then Current value corresponding to the target conversion signal is determined as to the controller of the acquisition electric current of the current collecting device ontology； Wherein, N >=1, the difference amplification module are the voltage divider principle based on the division module, can be defeated by the division module institute 2N+1 voltage value out is enlarged into the amplification module that 2N+1 amplified signal is equal.

Preferably, the division module includes:

For dividing the target current for being input to the current collecting device ontology, first voltage is obtained The resistor voltage divider circuit of value, second voltage value and third voltage value.

Preferably, the difference amplification module includes:

For carrying out signal amplification to the first voltage value, the first difference amplifier of the first amplified signal is obtained；

For carrying out signal amplification to the second voltage value, the second difference amplifier of the second amplified signal is obtained；

For carrying out signal amplification to the third voltage value, the third difference amplifier of third amplified signal is obtained.

Preferably, the converter includes:

For carrying out analog-to-digital conversion to first amplified signal according to the default transfer standard, the first conversion letter is obtained Number the first ADC；

For carrying out analog-to-digital conversion to second amplified signal according to the default transfer standard, the second conversion letter is obtained Number the 2nd ADC；

For carrying out analog-to-digital conversion to the third amplified signal according to the default transfer standard, third conversion letter is obtained Number the 3rd ADC.

Preferably, further includes:

The first isolating chip being isolated for the supply voltage to the first ADC and the controller；

The second isolating chip being isolated for the supply voltage to the 2nd ADC and the controller；

The third isolating chip being isolated for the supply voltage to the 3rd ADC and the controller.

Preferably, first isolating chip and/or second isolating chip and/or the third isolating chip are specific For optocoupler or magnetic coupling.

Preferably, further includes:

The first digital detection signal sent for receiving the controller, first digital detection signal is converted to First analog signal, and first analog signal is sent to the controller by the first ADC, so that the control Device carries out the first DAC of self-test to first digital detection signal；

The second digital detection signal sent for receiving the controller, second digital detection signal is converted to Second analog signal, and second analog signal is sent to the controller by the 2nd ADC, so that the control Device carries out the 2nd DAC of self-test to second digital detection signal；

The third digital detection signal sent for receiving the controller, the third digital detection signal is converted to Third analog signal, and the third analog signal is sent to the controller by the 3rd ADC, so that the control Device carries out the 3rd DAC of self-test to the third digital detection signal.

Preferably, the controller is specially the controller for being integrated with MCU and FPGA.

As it can be seen that being using division module first to the target current for being input to current collecting device ontology in the present invention It is divided, obtains 2N+1 voltage value；Then, recycle preparatory set good difference amplification module respectively to 2N+1 electricity Pressure value carries out signal amplification, obtains 2N+1 amplified signal；And then utilize converter according to default transfer standard respectively to 2N + 1 amplified signal carries out analog-to-digital conversion, obtains 2N+1 conversion signal；Finally, when controller judges to obtain this 2N+1 conversion It, then will be corresponding to target conversion signal when in signal in the presence of the target conversion signal being equal more than or equal to N+1 signal value Current value be determined as the acquisition electric current of current collecting device ontology.Obviously, through the invention provided by current collecting device, It is the equal of the target current point that current collecting device ontology will be input to using division module, difference amplification module and converter At 2N+1 current acquisition channel, because difference amplification module is designed by the voltage divider principle based on division module, If current collecting device, in the case where not by sampling resistor resistance value drift effect, difference amplification module can will divide The 2N+1 voltage value that die block is exported is enlarged into the amplified signal that 2N+1 numerical value is equal.Also, controller is to examine It measures to exist in this 2N+1 current acquisition channel and is greater than or equal to the conversion letter that N+1 current acquisition channel acquisition is converted to When number being equal, current value corresponding to target conversion signal is just determined as to the acquisition electric current of current collecting device ontology, this Sample can drift about to avoid sampling resistor resistance value of the prior art appeared in, and can not determine correct acquisition electric current Thus phenomenon can further increase accuracy and reliability when electric current is acquired in operation field.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis The attached drawing of offer obtains other attached drawings.

Fig. 1 is a kind of structure chart of current collecting device provided by the embodiment of the present invention；

Fig. 2 is the structure chart of another kind current collecting device provided by the embodiment of the present invention.

Fig. 3 is the structure chart of another current collecting device provided by the embodiment of the present invention；

Fig. 4 is a kind of structure chart of switch acquisition device provided by the embodiment of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Fig. 1 is please referred to, Fig. 1 is a kind of structure chart of current collecting device provided by the embodiment of the present invention, which adopts Acquisition means include: to obtain 2N+1 voltage value for dividing the target current for being input to current collecting device ontology Division module 11；It is connected with division module 11, for carrying out signal amplification to 2N+1 voltage value respectively, obtains 2N+1 amplification The difference amplification module 12 of signal；It is connected with difference amplification module 12, for being put respectively to 2N+1 according to default transfer standard Big signal carries out analog-to-digital conversion, obtains the converter 13 of 2N+1 conversion signal；It is connected with converter 13, for turning when 2N+1 It is when changing in signal in the presence of the target conversion signal being equal more than or equal to N+1 signal value, then target conversion signal institute is right The current value answered is determined as the controller 14 of the acquisition electric current of current collecting device ontology；

Wherein, N >=1, difference amplification module 12 are the voltage divider principle based on division module 11, can be by 11 institute of division module 2N+1 voltage value of output is enlarged into the amplification module that 2N+1 amplified signal is equal.

It in the present embodiment, in order to improve the accuracy and reliability of current collecting device collection result, is adopted in electric current Division module 11, difference amplification module 12, converter 13 and controller 14 are provided in acquisition means.Specifically, when electric current is adopted When acquisition means acquire target current, begin with division module 11 will be input to the target current of current collecting device ontology into Row partial pressure, obtains 2N+1 voltage value；Then, it recycles difference amplification module 12 to carry out signal to 2N+1 voltage value respectively to put Greatly, 2N+1 amplified signal is obtained；And then utilize converter 13 according to default transfer standard respectively to 2N+1 amplified signal Analog-to-digital conversion is carried out, 2N+1 conversion signal is obtained；Finally, recycle controller 14 judge in this 2N+1 conversion signal whether In the presence of the target conversion signal being equal more than or equal to N+1 signal value, it is greater than if existed in this 2N+1 conversion signal Or equal to N+1 signal value be equal target conversion signal when, then current value corresponding to target conversion signal is determined as The output electric current of current collecting device, that is, the actual acquisition electric current of current collecting device.

It is worth noting that, in the present embodiment, difference amplification module 12 is the voltage divider principle based on division module 11, energy Enough 2N+1 voltage values for being exported division module 11 are enlarged into the amplification module that 2N+1 amplified signal is equal, that is, It is that pre- first pass through is configured difference amplification module 12, so that difference amplification module 12 is carrying out letter to 2N+1 voltage value Number amplification after, can theoretically export the amplified signal that 2N+1 value of magnification is equal.That is, passing through current acquisition Set division module 11 divides target current in device, after obtaining 2N+1 voltage value, this 2N+1 voltage The numerical value of value may be the same or different；If 2N+1 voltage value numerical value is identical, by difference amplification module to 2N+1 A voltage value amplifies identical multiple, and the identical amplified signal of 2N+1 numerical value can be obtained；If 2N+1 voltage value numerical value is not It is identical, then different multiples are amplified to 2N+1 voltage value by difference amplification module, and export difference amplification module Obtain the identical amplified signal of 2N+1 numerical value.

It is also contemplated that if current collecting device is not influenced by the drift of sampling resistor resistance value, in this situation Under, the target current for being input to current acquisition ontology can be separated into 2N+1 by division module 11 and difference amplification module 12 The amplified signal that value of magnification is equal, at this point, recycling converter 13 according to default transfer standard to this 2N+1 amplified signal When carrying out analog-to-digital conversion, the conversion signal that 2N+1 conversion signal is equal will be theoretically obtained, then, controller 14 is being sentenced It, will be right by any one conversion signal institute in this 2N+1 conversion signal during constant current acquisition device acquires electric current The current value answered is determined as the acquisition electric current of current collecting device.

But if current collecting device is influenced by the drift of sampling resistor resistance value, in the case, pass through Although the target current for being input to current collecting device ontology can be separated into 2N+1 by division module 11 and difference amplification module 12 A amplified signal, still, this 2N+1 amplified signal may not be essentially equal, at this point, converter 13 can pass through default conversion Standard carries out analog-to-digital conversion to this 2N+1 amplified signal, and obtains 2N+1 conversion signal, in the case, 14 meeting of controller Judge with the presence or absence of the target conversion signal being equal more than or equal to N+1 signal value in this 2N+1 conversion signal, if There are target conversion signals in this 2N+1 conversion signal, then target conversion signal is determined as to the acquisition electricity of current collecting device Stream, that is, can will be more in 2N+1 conversion signal, also, current value corresponding to the identical conversion signal of numerical value is sentenced It is set to the acquisition electric current of current collecting device, and guarantees the reliability and confidence level of current collecting device collection result with this； If target conversion signal is not present in this 2N+1 conversion signal, illustrate the collection result of current collecting device at this time by The interference drifted about to sampling resistor resistance value is more serious, and the collection result that gets in this way is simultaneously unreliable, at this point it is possible to again into Row acquisition.

As it can be seen that being using division module first to the target electricity for being input to current collecting device ontology in the present embodiment Stream is divided, and 2N+1 voltage value is obtained；Then, recycle preparatory set good difference amplification module respectively to 2N+1 Voltage value carries out signal amplification, obtains 2N+1 amplified signal；And then it is right respectively according to default transfer standard using converter 2N+1 amplified signal carries out analog-to-digital conversion, obtains 2N+1 conversion signal；Finally, when controller judges to obtain this 2N+1 turns It is when changing in signal in the presence of the target conversion signal being equal more than or equal to N+1 signal value, then target conversion signal institute is right The current value answered is determined as the acquisition electric current of current collecting device ontology.Obviously, through this embodiment provided by current acquisition Device is the equal of the target that current collecting device ontology will be input to using division module, difference amplification module and converter Electric current is divided into 2N+1 current acquisition channel, because difference amplification module is designed by the voltage divider principle based on division module , so, if current collecting device is not in the case where by sampling resistor resistance value drift effect, difference amplification module is just The 2N+1 voltage value that division module can be exported is enlarged into the amplified signal that 2N+1 numerical value is equal.Also, it controls Device is that have more than or equal to N+1 current acquisition channel acquisition in detecting this 2N+1 current acquisition channel to be converted to Conversion signal when being equal, current value corresponding to target conversion signal is just determined as to the acquisition of current collecting device ontology Electric current can thus drift about to avoid sampling resistor resistance value of the prior art appeared in, and can not determine and correctly adopt Thus the phenomenon that colleeting comb, can further increase accuracy when electric current is acquired in operation field and reliable Property.

Based on the above embodiment, the present embodiment is further described and optimizes to technical solution, specifically, division module 11 include:

For dividing the target current for being input to current collecting device ontology, the first voltage value, the second electricity are obtained The resistor voltage divider circuit of pressure value and third voltage value.

Specifically, resistor voltage divider circuit can be set by division module 11, that is, will be defeated using resistor voltage divider circuit Enter to the target current of current collecting device ontology and divided, and the target of current collecting device ontology will be input to this Electric current carries out voltage division processing.It not only ensure that exploitativeness of the division module 11 in practical application in this way, moreover, because electric Hinder bleeder circuit for other bleeder mechanisms, cost relative moderate, so, when by division module 11 be set as electricity When hindering bleeder circuit, so that it may the cost of relative reduction division module.

As a preferred embodiment, difference amplification module 12 includes:

For carrying out signal amplification to the first voltage value, the first difference amplifier of the first amplified signal is obtained；

For carrying out signal amplification to second voltage value, the second difference amplifier of the second amplified signal is obtained；

For carrying out signal amplification to third voltage value, the third difference amplifier of third amplified signal is obtained.

In the present embodiment, be set difference amplification module 12 to the first difference amplifier, the second difference amplifier and Third difference amplifier, and signal amplification is carried out to the first voltage value using the first difference amplifier, obtain the first amplification letter Number, signal amplification is carried out to second voltage value using the second difference amplifier, the second amplified signal is obtained, utilizes third difference Amplifier to carry out signal amplification to third voltage value, obtains third amplified signal.It is also contemplated that when utilizing three difference When amplifier comes to carry out signal amplification to the first voltage value, second voltage value and third voltage value respectively, so that it may avoid right The first voltage value, second voltage value and third voltage value carry out interfering with each other in signal amplification process, thus can be into one When step is lifted to the progress signal amplification of the first voltage value, second voltage value and third voltage value, signal amplifies the accurate of result Property and reliability.

As it can be seen that technical solution provided by through this embodiment, can be further improved current collecting device testing result Accuracy.

As a preferred embodiment, converter 13 includes:

For carrying out analog-to-digital conversion to the first amplified signal according to default transfer standard, the first of the first conversion signal is obtained ADC；

For carrying out analog-to-digital conversion to the second amplified signal according to default transfer standard, the second of the second conversion signal is obtained ADC；

For carrying out analog-to-digital conversion to third amplified signal according to default transfer standard, the third of third conversion signal is obtained ADC。

It is understood that being divided using controller 14 target current being input in current collecting device ontology During analysis, controller 14 be by digital signal carry out analysis just obtain final analysis as a result, so, in this implementation It is in converter 13 to be adapted with division module 11 provided in above-described embodiment and difference amplification module 12 in example Provided with three road ADC (Analog to Digital Converter, A/D converter), because ADC can be by consecutive variations Analog signal be converted to discrete digital signal, so, the first ADC, the 2nd ADC and the 3rd ADC can turn according to default First amplified signal, the second amplified signal and third amplified signal are carried out analog-to-digital conversion respectively by dehorn standard, accordingly obtain first Conversion signal, the second conversion signal and third conversion signal, that is, the first amplified signal, the second amplified signal and third are put Big signal is digital signal, and such controller 14 can be analyzed and be sentenced to the collected electric current of current collecting device institute It is disconnected.

As a preferred embodiment, above-mentioned current collecting device further include:

The first isolating chip being isolated for the supply voltage to the first ADC and controller 14；

The second isolating chip being isolated for the supply voltage to the 2nd ADC and controller 14；

The third isolating chip being isolated for the supply voltage to the 3rd ADC and controller 14.

It is understood that in practical application, the supply voltage being powered to the first ADC and controller 14 is respectively not It is identical, it thus will lead to current collecting device during acquiring electric current, it is possible that the phenomenon that interfering with each other.

It in the present embodiment, is to be provided in current collecting device for the in order to avoid the generation of above situation The first isolating chip that the supply voltage of one ADC and controller 14 is isolated opposite can thus guarantee current acquisition dress Set safety and reliability in use.For the same reason, in the present embodiment, also in current collecting device In be provided with the second isolating chip being isolated for the supply voltage to the 2nd ADC and controller 14 and for third The third isolating chip that the supply voltage of ADC and controller 14 is isolated.

As it can be seen that technical solution provided by through this embodiment, further ensures current collecting device in use process In global reliability.

As a preferred embodiment, the first isolating chip and/or the second isolating chip and/or third isolating chip Specially optocoupler or magnetic coupling.

Specifically, optocoupler can be set by the first isolating chip and/or the second isolating chip and/or third isolating chip (Opticalcoupler Equipment, OCEP), because optocoupler not only has the ability of one-way transmission signal, moreover, in light The input terminal and output end of coupling can fully achieve electrical isolation, thus ensure that signal is whole reliable in transmission process Property.

Alternatively, magnetic coupling can also be set by isolating chip and/or the second isolating chip and/or third isolating chip, because Uncertain electric current transfer ratio and at any time drift can not only be eliminated for magnetic coupling and the problem of with temperature drift, moreover, Magnetic coupling can also realize the high-speed data isolation of 150Mbps in the case where low-power consumption, thus allow for the first ADC, the Two ADC and the 3rd ADC can be directly directly connected to the control chip of various high speeds.

Disclosure of that based on the above embodiment, the present embodiment are illustrated by a specific example.Refer to figure 2, Fig. 2 be the structure chart of another kind current collecting device provided by the embodiment of the present invention.In the current collecting device, partial pressure Module 11 is specially the resistance as composed by resistance R11, resistance R12, resistance R13, resistance R14, resistance R15 and resistance R16 point Volt circuit, difference amplification module 12 include the first difference amplifier, the second difference amplifier and third difference amplifier, conversion Device 13 includes the first ADC, the 2nd ADC and the 3rd ADC, further includes the first isolating chip, the second isolating chip, third isolating chip And controller；

Wherein, the first end of resistance R11 is filled with the first end of resistance R13, the first end of resistance R14 and current acquisition respectively The first connecting terminal for setting is connected, the second end of resistance R11 respectively with the first end of resistance R12, the first end of resistance R15 and electricity The first end for hindering R16 is connected, and the second end of resistance R12 is connected with the second connecting terminal of current collecting device, and is grounded, resistance The second end of R13 is connected with the normal phase input end of the first difference amplifier, the negative-phase input of the first difference amplifier and the 7th The first end of resistance is connected, the second end ground connection of the 7th resistance, the second end of the second end of resistance R14 and resistance R15 respectively with The normal phase input end of second difference amplifier is connected with negative-phase input, second end and the third difference amplifier of resistance R16 Normal phase input end is connected, and the negative-phase input of third difference amplifier is connected with the first end of the 8th resistance, and the of the 8th resistance Two ends ground connection；The output end of first difference amplifier, the output end of the second difference amplifier and third difference amplifier it is defeated Outlet is connected with the input terminal of the first ADC, the input terminal of the 2nd ADC and the input terminal of the 3rd ADC respectively, the output of the first ADC End, the output end of the 2nd ADC and the 3rd ADC output end respectively with the input terminal of the first isolating chip, the second isolating chip The input terminal of input terminal and third isolating chip is connected, the output end of the output end of the first isolating chip, the second isolating chip And the output end of third isolating chip is connected with controller 14.

Specifically, when target voltage enters two-wire system power supply terminal by the current-limiting protection circuit in current collecting device When, target voltage can be powered the instrument in industry spot, at this point, first wiring of the target current from current collecting device Terminal flow into, and from the second connecting terminal of current collecting device flow out, in the case, target current can via resistance R11, Resistor voltage divider circuit composed by resistance R12, resistance R13, resistance R14, resistance R15 and resistance R16 is divided into three road voltages, In This can be respectively labeled as V1, V2 and V3, then, then respectively by the first difference amplifier, the second difference amplifier and Third difference amplifier carries out difference amplification to V1, V2 and V3, obtains three tunnel amplified signals, can be respectively labeled as herein A1, A2 and A3, and then via the first ADC, the 2nd ADC and the 3rd ADC respectively according to default transfer standard to A1, A2 and A3 Carry out analog-to-digital conversion, obtain three tunnel conversion signals, be respectively labeled as B1, B2 and B3 herein, finally, controller 14 by pair B1, B2 and B3 are compared, and are judged with the presence or absence of the target conversion signal that two paths of signals value is equal in B1, B2 and B3, if deposited The target conversion signal is then being determined as to the acquisition electric current of the current collecting device.It obviously, can by the current collecting device The current acquisition value of mistake to be rejected, thus can the opposite accuracy for guaranteeing current collecting device collection result with Reliability.

Based on the above embodiment, the present embodiment is further described and optimizes to technical solution, refers to Fig. 3, and Fig. 3 is The structure chart of another current collecting device provided by the embodiment of the present invention.Specifically, above-mentioned current collecting device further include:

For receiving the first digital detection signal of the transmission of controller 14, the first digital detection signal is converted into the first mould Quasi- signal, and the first analog signal is sent to controller 14 by the first ADC, so that controller 14 believes the first Digital Detecting Number carry out self-test the first DAC；

For receiving the second digital detection signal of the transmission of controller 14, the second digital detection signal is converted into the second mould Quasi- signal, and the second analog signal is sent to controller 14 by the 2nd ADC, so that controller 14 believes the second Digital Detecting Number carry out self-test the 2nd DAC；

For receiving the third digital detection signal of the transmission of controller 14, third digital detection signal is converted into third mould Quasi- signal, and third analog signal is sent to controller 14 by the 3rd ADC, so that controller 14 believes third Digital Detecting Number carry out self-test the 3rd DAC.

In order to further ensure the accuracy and reliability of current collecting device acquisition electric current, also in current collecting device It is respectively provided with the first DAC, the 2nd DAC and the 3rd DAC.Since the working principle of the first DAC, the 2nd DAC and the 3rd DAC are similar It seemingly, so, in the present embodiment, is illustrated by taking the first DAC as an example.Specifically, being to utilize first in the present embodiment First digital detection signal is converted to the first simulation letter to receive the first digital detection signal that controller 14 is sent by DAC Number, later, the first analog signal can be sent to controller 14 by the first ADC by the first DAC, so that controller 14 can be to One digital detection signal carries out self-test.Specifically, when the first ADC receives the first analog signal transmitted by the first DAC, the First analog signal can be converted into the first digital signal corresponding with the first analog signal, then, the first ADC meeting by one ADC First digital signal is sent to controller, such controller can be by the first digital signal fed back and the first number Detection signal be compared, with to the first digital detection signal carry out self-test, thus can be further ensured that analog signal and/ Or accuracy and confidence level of the digital signal in conversion process.

Fig. 3 is referred to, in practical application, can also be added respectively in the front end of the first ADC, the 2nd ADC and the 3rd ADC Add analog switch and filter module to assist the first digital detection signal, the second digital detection signal and third digital detection signal Process of self-test.Herein, it is illustrated for analog switch and filter module set by the first front end ADC.That is, passing through The analog switch of first front end ADC connects the first DAC and the first ADC, then passes through the filter module of the first front end ADC to first Detection signal is filtered, and can thus make the process of self-test of current collecting device more accurately and reliably, such as: if First DAC output is ladder square-wave signal, then, the first ADC also should collected be ladder square-wave signal.Similarly, The effect of two ADC and the analog switch and filter module and the analog switch and filter module of the first front end ADC of the 3rd front end ADC It is similar, therefore this is no longer going to repeat them.

Further, it is also possible to distinguish in the front end of the first difference amplifier, the second difference amplifier and third difference amplifier Protection circuit and common mode inductance are set to further increase the global reliability of current collecting device in the process of running.Also, In practical application, multiple sub-controllers can also be set by controller 14, that is, respectively in the first isolating chip, Mutually independent first sub-controller, the second sub-controller and third is arranged in the rear class of two isolating chips and third isolating chip Thus controller can further increase current collecting device collection result to avoid the mutual crosstalk between acquisition signal Levels of precision.

As it can be seen that technical solution provided by through this embodiment, may further ensure that current collecting device collection result Global reliability.

Based on the above embodiment, the present embodiment is further described and optimizes to technical solution, and controller 14 is specially It is integrated with the controller of MCU and FPGA.

Specifically, in the present embodiment, be controller 14 is set to be integrated with MCU (Microcontroller Unit, Micro-control unit) and FPGA (Field Programmable Gate Array, field programmable gate array) controller.Cause It is all the logic calculation chip with powerful logic computing function for MCU and FPGA, so, when setting integrated for controller 14 When having the controller of MCU and FPGA, so that it may so that controller 14 has the function of stronger calculation processing, it thus can be into one Step accelerates speed of the current collecting device when determining effective current value.

As it can be seen that technical solution provided by through this embodiment, it can the opposite processing speed for improving controller.

Currently, the switch acquisition device seen on the market is usually to be made of an Acquisition Circuit, in this context, In order to meet the reliability of operation field acquisition switching value, it will usually two switch acquisition devices be carried out parallel connection, then, led to It crosses and judges whether the collection capacity of two switch acquisition devices is consistent, then come the value that determines switching value in operation field.Such as When two collected signals of switch acquisition device of fruit are inconsistent, it can not just confirm which switching value is only and correctly take Thus value just not can guarantee the accuracy and reliability of acquisition switching value.It, can also be according to above-described embodiment for problems The working principle of provided current collecting device resets the structure of switch acquisition device, and is further increased with this The accuracy and reliability of switch acquisition device collection result.

Fig. 4 is referred to, Fig. 4 is a kind of structure chart of switch acquisition device provided by the embodiment of the present invention.The switch Measuring acquisition device includes resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27 and resistance R28, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3, the first logical device, the second logical device, third logical device, the first 4-16 Decoder, the 2nd 4-16 decoder, the 3rd 4-16 decoder, first choice switch, the second selection switch, third select switch, Isolating chip 21, isolating chip 22, isolating chip 23, the first controller, second controller and third controller；

Wherein, the first connecting terminal of switch acquisition device is connected with the anode of diode, the cathode and electricity of diode Hinder R21 first end be connected, the second end of resistance R21 respectively with the first end of resistance R22, the first end of resistance R23, resistance The first end of R24 is connected with the first end of resistance R25, the second end ground connection of resistance R22；The second end of resistance R23 respectively with electricity The first end of resistance R26 is connected with the grid of metal-oxide-semiconductor Q1, and the second end of resistance R26 is connected with the first end of the first logical device, the The second end of one logical device is connected with the first end that first choice switchs, the second end and isolating chip 21 of first choice switch First input end be connected, the second input terminal of isolating chip 21 is connected with the first controller, the output end of isolating chip 21 and The input terminal of first 4-16 decoder is connected, and the output end of the first 4-16 decoder is connected with the source electrode of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 Grounded drain；The second end of resistance R24 is connected with the grid of the first end of resistance R27 and metal-oxide-semiconductor Q2 respectively, resistance R27's Second end is connected with the first end of the second logical device, the first end phase of the second end of the second logical device and the second selection switch Even, second selection switch second end be connected with the first input end of isolating chip 22, the second input terminal of isolating chip 22 and Second controller is connected, and the output end of isolating chip 22 is connected with the input terminal of the 2nd 4-16 decoder, the 2nd 4-16 decoder Output end be connected with the source electrode of metal-oxide-semiconductor Q2, the grounded drain of metal-oxide-semiconductor Q2；The second end of resistance R25 is respectively with resistance R28's First end is connected with the grid of metal-oxide-semiconductor Q3, and the second end of resistance R28 is connected with the first end of third logical device, third logic The second end of device is connected with the first end of third selection switch, the second end and the first of isolating chip 23 of third selection switch Input terminal is connected, and the second input terminal of isolating chip 23 is connected with third controller, the output end of isolating chip 23 and the 3rd 4- The input terminal of 16 decoders is connected, and the output end of the 3rd 4-16 decoder is connected with the source electrode of metal-oxide-semiconductor Q3, the drain electrode of metal-oxide-semiconductor Q3 Ground connection.

In the switch acquisition device, when target voltage is passed through by the current-limiting protection circuit in switch acquisition device Second connecting terminal of diode access switch amount acquisition device, and the first connecting terminal by being connected with the second connecting terminal When the inside of access switch amount acquisition device, resistance R21, resistance R22, resistance R23, resistance R24 and resistance R25 institute group can be passed through At bleeder circuit target voltage is sent into three independent acquisition channels, and judged on respective acquisition channel according to collection result Switching value, wherein the control for the 4-16 decoder that the grid voltage of metal-oxide-semiconductor can be attached thereto in each acquisition channel, That is, the grid voltage of metal-oxide-semiconductor Q1 by the control of the first 4-16 decoder, metal-oxide-semiconductor Q2 grid voltage by the 2nd 4-16 decoder Control, metal-oxide-semiconductor Q3 grid voltage by the 3rd 4-16 decoder control.

In the switching value of the switch acquisition device collection site, the grid electricity of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 Pressure is low level, and the source electrode and drain electrode high impedance of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 are isolated, at this point, the first logic chip, Second logic chip and third logic chip acquire the switching value on respective acquisition channel.

Wherein, live on-off model is defaulted as high level " 1 ", existing when scene switch because when certain reason is closed Field switch amount signal is just low level " 0 ", so, first choice switch, the second selection switch, third selection switch, the first 4- 16 decoders, the 2nd 4-16 decoder, the 3rd 4-16 decoder, metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 are used by cooperating In complete signal acquisition and periodically diagnosis switching value channel whether be low level " 0 ", that is, switch acquisition fill The idling cycle of normal acquisition is set, the grid voltage of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 are high level, metal-oxide-semiconductor Q1, MOS The source electrode and drain electrode Low ESR of pipe Q2 and metal-oxide-semiconductor Q3 is connected, at this point, resistance R26 and the voltage of the junction resistance R23 are low level (about 0V), in the case, the collected level value of the first logic chip are low level.In other words, that is, by such Whether the electronic component that mode is come in detection switch amount acquisition device is in normal operating conditions.

When the first controller collects the level value of the first acquisition channel, second controller collects the second acquisition and leads to After level value, the third controller in road collect the level value of third acquisition channel, the first controller, second controller and Third controller judges the first acquisition channel, the second acquisition channel and the collected electricity of third acquisition channel by information exchange With the presence or absence of the target level value that two-way is equal in level values, if it is present thinking target level value for switch acquisition dress The collection result set, if it does not exist, then this time collection result and unreliable of the switch acquisition device is thought, in this situation Under, so that it may the switching value in scene is acquired again.

Specifically, the resistance value of resistance R21 and resistance R22 can be set to 5K Ω, resistance R23, resistance R24 and resistance The resistance value of R25 is set as 90K Ω, and the resistance value of resistance R26, resistance R27 and resistance R28 are set as 10K Ω；And by metal-oxide-semiconductor Q1, Metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 is set as the enhanced metal-oxide-semiconductor of N-channel.

Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other The difference of embodiment, same or similar part may refer to each other between each embodiment.For being filled disclosed in embodiment For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part Explanation.

Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged Except there is also other identical elements in the process, method, article or apparatus that includes the element.

A kind of current collecting device provided by the present invention is described in detail above, it is used herein specifically a Principle and implementation of the present invention are described for example, and it is of the invention that the above embodiments are only used to help understand Method and its core concept；At the same time, for those skilled in the art, according to the thought of the present invention, in specific embodiment party There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.