CN102062799B - Vehicle mounted electrical isolation measuring circuit - Google Patents
Vehicle mounted electrical isolation measuring circuit Download PDFInfo
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- CN102062799B CN102062799B CN200910223743A CN200910223743A CN102062799B CN 102062799 B CN102062799 B CN 102062799B CN 200910223743 A CN200910223743 A CN 200910223743A CN 200910223743 A CN200910223743 A CN 200910223743A CN 102062799 B CN102062799 B CN 102062799B
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Abstract
The invention provides a vehicle mounted electrical isolation measuring circuit. the circuit comprises a controller and a power supply circuit, wherein the controller is connected with a switching circuit through a control signal isolating circuit; the output end of the switching circuit is connected with input end of a linear optocoupler isolating circuit, the output end of the linear optocoupler isolating circuit is connected with an analog-to-digital converter, the analog-to-digital converter is connected with the controller; and the power supply circuit is connected with the switching circuit, the linear optocoupler isolating circuit and the control signal isolating circuit to provide electrical power for the three circuits. The vehicle mounted electrical isolation measuring circuit uses the linear optocoupler isolating circuit to realize electrical isolation between the analog quantity of a measurand and a vehicle mounted microcomputer; and the power supply circuit and the control signal isolating circuit are used to isolate power signals and control signals, thus the problem that the vehicle mounted microcomputer is damaged owning to high voltage and large current serial-in, can be solved completely.
Description
Technical field
The embodiment of the invention relates to electrical isolation metering circuit technical field, relates in particular to a kind of onboard electrical isolated measurement circuit that is used to realize electrical isolation between vehicle-mounted microcomputer and the tested analog quantity.
Background technology
Analog quantitys such as high-voltage large current usually need measured and control to vehicle-mounted microcomputer; In case high voltage, big electric current seal in microcomputer, might microcomputer be damaged, therefore; Generally can between analog quantity and microcomputer, carry out electrical isolation, seal in microcomputer to prevent high voltage, big electric current.
Normal transformer or the Hall element of adopting realized the electrical isolation between vehicle-mounted microcomputer and the analog quantity in the prior art; Wherein, Transformer isolation uses transformer coil to make transmission information through isolation barrier, and the electric current that the electric current of isolated preceding-terminal changes the opposite side that causes through coil changes, but transformer isolation generally is used to the AC signal that is coupled; The direct current signal that can't be coupled, and the volume ratio of transformer is bigger; Hall device is on the basis of Hall effect principle, to utilize integrated circuit technique to process; Make buffer circuit with it and have that volume is little, power consumption is little, the frequency advantages of higher; But integrated isolated amplifier internal circuit is complicated, and cost is high, is not suitable for large-scale application.
Summary of the invention
The technical matters that the embodiment of the invention solves is: a kind of onboard electrical isolated measurement circuit is provided, and in order to realize the electrical isolation between tested analog quantity and the vehicle-mounted microcomputer, solution seals in the problem that vehicle-mounted microcomputer damages vehicle-mounted microcomputer because of high voltage, big electric current.
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of onboard electrical isolated measurement circuit, comprising:
Controller through the control signal buffer circuit, is connected with on-off circuit; The steering order of the said on-off circuit break-make of the control that said controller sends after the said control signal buffer circuit of process carries out electrical isolation, is admitted to said on-off circuit;
The output terminal of said on-off circuit is connected with the input port of a linear optical coupling buffer circuit, and the output terminal of said linear optical coupling buffer circuit is connected with an analog to digital converter, and said analog to digital converter is connected with said controller; Carry out being admitted to said controller to carry out measurement processing after electrical isolation and said analog to digital converter carry out analog to digital conversion through said linear optical coupling buffer circuit by the simulating signal of the onboard system of said on-off circuit collection;
Feed circuit are connected with said on-off circuit, said linear optical coupling buffer circuit and said control signal buffer circuit, to said on-off circuit, said linear optical coupling buffer circuit and said control signal buffer circuit power supply to be provided.
The onboard electrical isolated measurement circuit of the embodiment of the invention; Realize measured analog quantity and the electrical isolation between the vehicle-mounted microcomputer through the linear optical coupling buffer circuit; Simultaneously; Through feed circuit and control signal buffer circuit, realize power supply signal and the electrical isolation of control signal between tested simulating signal end and the vehicle-mounted microcomputer, thoroughly solved because of high voltage, big electric current and sealed in the problem that vehicle-mounted little machine damages vehicle-mounted microcomputer.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply; Obviously, the accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the onboard electrical isolated measurement circuit structural representation of the embodiment of the invention one;
Fig. 2 is the precision photoelectric coupler structural representation of the embodiment of the invention two;
Fig. 3 is the linear optical coupling buffer circuit structural representation of the embodiment of the invention two;
Fig. 4 is the on-off circuit structural representation of the embodiment of the invention three;
Fig. 5 is the power supply circuit construction synoptic diagram of the embodiment of the invention four;
Fig. 6 is the control signal buffer circuit structural representation of the embodiment of the invention five.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Photo-coupler is the media transmission electric signal with light, and input, output electric signal are had the good isolation effect, in various circuit, is widely used.Isolate mutually between the photo-coupler input and output, the electric signal transmission has characteristics such as one-way, therefore, has good electrical isolation capabilities and antijamming capability.Simultaneously, the input end of photo-coupler is the low resistance element of current drives work, has very strong common mode inhibition capacity.Therefore, photo-coupler can improve signal to noise ratio (S/N ratio) greatly as isolated component, especially in real time computer control as the interface device of Signal Spacing, can improve the reliability of computer operation greatly.Based on this, the invention provides a kind of onboard electrical isolated measurement circuit, be applicable to vehicle-mounted measuring system, the electrical isolation when realizing that vehicle-mounted microcomputer is measured the simulating signal of onboard system, protection vehicle-mounted microcomputer.
Embodiment one
Fig. 1 is the onboard electrical isolated measurement circuit structural representation of the embodiment of the invention one; As shown in Figure 1; The onboard electrical isolated measurement circuit that present embodiment provides comprises: controller 11, control signal buffer circuit 12, linear optical coupling buffer circuit 13, feed circuit 14, on-off circuit 15 and analog to digital converter 16, and wherein, controller 11 can be wholely set with vehicle-mounted microcomputer; Realize various functions based on vehicle-mounted microcomputer, also can be independent of the vehicle-mounted microcomputer setting.
Be connected with linear optical coupling buffer circuit 13 and analog to digital converter 16 between the signal transmission pathway between controller 11 and the on-off circuit 15.The input end of linear optical coupling buffer circuit 13 is connected with the output terminal of on-off circuit 15, is used for the simulating signal of the onboard system of receiving key circuit collection; The output terminal of linear optical coupling buffer circuit 13 is connected with the input end of analog to digital converter 16, carries out analog to digital conversion for the simulating signal after 16 pairs of electrical isolation of analog to digital converter; The output of analog to digital converter 16 is connected in controller, and digitized signal is offered controller, to carry out measurement processing.
Wherein, In simulating signal that the input end of on-off circuit 15 is connected from system; And an end at on-off circuit 15 places exists high voltage, big current signal; Be called by isolation end, the circuit place end on the on-off circuit 15 is called isolation end, and concrete isolation end comprises the input end of analog to digital converter 16, controller 11, control signal buffer circuit 12, the output terminal of linear optical coupling buffer circuit 13 and the input end of feed circuit 14; And the output terminal of the input end of the output terminal of control signal buffer circuit 12, linear optical coupling buffer circuit 13, feed circuit 14 is between by isolation end and isolation end, to realize electrical isolation.
The power supply of identical voltage can be shared one in the circuit of isolation end one side, and can a shared earth terminal; Feed circuit 14 are used between required supply voltage and earth signal is provided by the circuit of isolation end and isolation end; Be that those circuit can a shared power supply; Also can a shared earth terminal, and the power supply of this power supply and isolation end is not altogether, is independent of each other; Concrete, at isolation end, the system of present embodiment provides two kinds of power supplys: a kind of power supply can provide+5V voltage, and power supply 10 as shown in Figure 1 is used for to controller 11 power supplies; A kind of power supply can provide+12V and-12V voltage (not shown), be used for other circuit supplies to isolation end.The input end of feed circuit 14 can provide with isolation end+and the power supply 10 of 5V voltage is connected; Output terminal output+the 12V of feed circuit 14 and-12V voltage; Offer control signal buffer circuit 12, linear optical coupling buffer circuit 13, on-off circuit 15, these feed circuit 14 not only are used for electricity to foregoing circuit being provided, and are independently by the voltage of feed circuit 14 outputs and the power supply of isolation end; Therefore the input end and the signal between the output terminal that guarantee foregoing circuit are realized electrical isolation not altogether fully.
Based on above-mentioned, introduce the principle of work of the onboard electrical isolated measurement circuit that present embodiment provides below in detail, and following examples are all based on this, so in following each embodiment, will repeat no more, this principle of work is specially:
The steering order that controller 11 sends the CS connecting and disconnecting of the circuit to on-off circuit 15; This steering order be used for the CS circuit a road by gating; So that the simulating signal of onboard system gets into controller 11 after analog to digital conversion, handle by 11 pairs of digitized signals of controller; Its middle controller 11 can store result; To be read when needed, also can deliver on the vehicle-mounted bus (for example CAN bus), with the control onboard system through the vehicle-mounted EBI that is connected with controller.
Wherein, behind the steering order process control signal buffer circuit 12 that controller 11 sends, can realize and be input to the complete electrical isolation of the steering order of on-off circuit 15; Behind the simulating signal process linear optical coupling buffer circuit 13 of on-off circuit collection, realize complete electrical isolation between simulating signal that on-off circuit 15 is exported and the digitized signal that gets into controller 11; Based on feed circuit 14, the power supply signal of the input/output terminal of each circuit has also been realized complete electrical isolation.
What wherein, controller 11 was concrete can be by chip microcontroller.
The onboard electrical isolated measurement circuit that present embodiment provides; Based on the feed circuit, linear optical coupling buffer circuit and the control signal buffer circuit that are connected between vehicle-mounted microcomputer and the on-off circuit; Realize that vehicle-mounted microcomputer is when measuring tested simulating signal; Electrical isolation between high voltage, big current signal and the vehicle-mounted microcomputer avoids vehicle-mounted microcomputer to seal in and burnt because of high voltage, big current signal.
Further; For the slewing rate of balance analog to digital converter 16 and the reading speed of controller 11; Between analog to digital converter 16 and controller 11, can be provided with a buffer 17; Buffer 17 is sent in the output of analog to digital converter 16 earlier, from buffer 17, reads digitized signal by controller 11 then.
Embodiment two
Based on embodiment one; Present embodiment provides the concrete implementation that realizes the linear optical coupling buffer circuit; Linear photoconductor photo-coupler in the present embodiment comprises light emitting diode, feedback subelement and output subelement, and wherein, light emitting diode is the radiating portion of light; The feedback subelement is that the light that is used to feed back is accepted circuit; The output subelement is accepted circuit for the light that amplifies output, and wherein two light are accepted circuit and can be accepted approximately equalised light, specifically can be realized by photodiode or phototriode.Fig. 2 is the precision photoelectric coupler structural representation of the embodiment of the invention two, and Fig. 3 is the linear optical coupling buffer circuit structural representation of the embodiment of the invention two.As shown in Figure 2, in the present embodiment, it all is example with the photodiode that two light are accepted circuit.
As shown in Figure 2, light emitting diode 21 has pin 1 and pin 2, and wherein pin 1 is the positive pole of light emitting diode 21, and pin 2 is the negative pole of light emitting diode 21; Photodiode 22 has pin 3 and pin 4, and wherein pin 3 is the positive pole of photodiode 22, and pin 4 is the negative pole of photodiode 22; Photodiode 23 has pin 5 and pin 6, and wherein pin 5 is the positive pole of photodiode 23, and pin 6 is the negative pole of photodiode 23.
Based on precision photoelectric coupler structural representation shown in Figure 2, the linear optical coupling buffer circuit that present embodiment provides is as shown in Figure 3, comprising: first electronic circuit 300 and output circuit 301.Wherein, first electronic circuit 300 comprises first dropping resistor 31, first operational amplifier 32, first current amplification circuit 33, first precision photoelectric coupler 34 (its structure is as shown in Figure 2); Output circuit 301 comprises the 3rd operational amplifier 35 and is parallel to inverting input and the output resistance between the output terminal 36 and output capacitance 37 of the 3rd operational amplifier 35.The other end of first dropping resistor 31 is the input port VIN of linear optical coupling buffer circuit, and the output terminal of the 3rd operational amplifier 35 is the output terminal VOUT of linear optical coupling buffer circuit.This first electronic circuit 300 combines with output circuit 301, is used to realize the electrical isolation of the positive simulating signal (embodying with voltage form) to input port VIN reception.
Concrete, first dropping resistor 31 is connected with the inverting input of first operational amplifier 32, its in-phase input end ground connection COM, and its output terminal is connected with first current amplification circuit 33; The output terminal of first current amplification circuit 33 is connected with the pin 1 of light emitting diode 21; Drive current to be provided to light emitting diode 21; The pin 2 of light emitting diode 21 and the pin 3 ground connection COM of photodiode 22; The pin 4 of photodiode 22 is connected in the inverting input of first operational amplifier 32, is used for to first operational amplifier, 32 feedback signals; The pin 5 ground connection GND of photodiode 23, its pin 6 is connected with the inverting input of the 3rd operational amplifier 35.Wherein, the power supply of first operational amplifier is V2, and the power supply of the 3rd operational amplifier 35 is V1.Wherein power supply V2 and ground COM are that output by feed circuit 14 (as shown in Figure 1) provides; And based on embodiment one, the voltage of power supply V2 is-12V and+12V in the present embodiment, and to be the voltage that provides of system be the power supply of-12V and+12V to power supply V1; Ground GND is the ground of isolation end; With ground COM be independently, hence one can see that, the input end of linear optical coupling buffer circuit and output terminal are not altogether.
The linear optical coupling buffer circuit that present embodiment provides, after the electric signal process of its input is amplified, the driven for emitting lights diode; Make it to send the light of certain wavelength; Received and the generation photocurrent by optical receiver, the one tunnel feeds back, the output after further amplifying of another road; Realize the conversion of electricity-light-electricity, played the effect of isolating between the input and output; Simultaneously, the nonlinear characteristic of backfeed loop and the nonlinear characteristic of output loop offset, and realize linear purpose of isolating, and isolated DC signal and AC signal have simultaneously overcome the defective that the traditional transformer isolation method can't the isolated DC signal.
On the basis of technique scheme; The linear optical coupling buffer circuit that present embodiment provides also comprises second electronic circuit 302; This second electronic circuit 302 combines with output circuit 301; Be used to realize negative analog signal (with the negative voltage embodied) electrical isolation that input port is received, this second electronic circuit comprises: second dropping resistor 38, second operational amplifier 39, second current amplification circuit 40 and second precision photoelectric coupler 41 (its inner structure is as shown in Figure 2).
Concrete, second dropping resistor 38 is connected with the inverting input of second operational amplifier 39, the in-phase input end ground connection COM of second operational amplifier 39, and its output terminal is connected with the input end of second current amplification circuit 40; The output terminal of second current amplification circuit 40 is connected with the pin 1 of the light emitting diode of second precision photoelectric coupler 41, so that current signal driven for emitting lights led lighting to be provided; The pin 3 of the photodiode that is used to feed back in second precision photoelectric coupler 41 is connected in the inverting input of second operational amplifier 39, and pin 4 is connected with ground COM; The pin 5 of the photodiode that is used to export in second precision photoelectric coupler 41 is connected with the inverting input of the 3rd operational amplifier 35, and its pin 6 is connected with ground GND.Wherein, Because precision photoelectric coupler has the characteristics of one-way transmission signal; Therefore when the polarity of the signal of input port reception is opposite; Precision photoelectric coupler different with connected mode its peripheral circuit, the photodiode that for example is used to feed back in first precision photoelectric coupler 34 and second precision photoelectric coupler 41 in the present embodiment is opposite with the connected mode of peripheral circuit.
The principle of doing of this second electronic circuit 302 and output circuit 301 combinations, similar with the principle of work that output circuit 301 combines with first electronic circuit 300, difference only is that the polarity of input signal is different, causes signal flow to difference, so repeat no more at this.
Present embodiment through second electronic circuit is provided, can be realized the electrical isolation to bipolar signal on the basis of the foregoing description, further practical requirement.Realize vehicle-mounted microcomputer in the bus signals test process based on single circuit, the electrical isolation between opposed polarity signal and the vehicle-mounted microcomputer is very easy to test process, has improved work efficiency.
On the basis of technique scheme, wherein first current amplification circuit 33 can be realized by a PNP triode additional peripheral circuitry; Concrete, the base stage of PNP triode is connected with first resistance and second resistance, and the other end of first resistance is connected in (as shown in Figure 3) output terminal of first operational amplifier 32; The 3rd resistance that the PNP transistor emitter connects, second resistance is connected with power supply V2 respectively with the other end of the 3rd resistance; The collector of PNP triode is as the output terminal of first current amplification circuit 33, is connected with the pin 1 of the light emitting diode of first precision photoelectric coupler 34.
Wherein, second current amplification circuit 40 can realize that concrete, the base stage of NPN triode is connected with the 4th resistance and the 5th resistance by a NPN triode additional peripheral circuitry, and the other end of the 4th resistance is connected in the output terminal of second operational amplifier 39; The collector of NPN triode is connected with the 6th resistance, and the other end of the 5th resistance and the 6th resistance is connected with power supply V2; The emitter of NPN triode is as the output terminal of second current amplification circuit 40, is connected with the pin 1 of the light emitting diode of second precision photoelectric coupler 41.
Above-mentioned current amplification circuit is realized the amplification to the opposed polarity signal through the triode of different model, and the implementation of above-mentioned amplifying circuit is simple.
On the basis of technique scheme; Also be serially connected with a variable resistor after the output resistance 36 of output circuit 301; Be specially slide rheostat 361 (as shown in Figure 3); These slide rheostat 361 its fine setting effects are used for the output resistance 36 that compensating circuit itself causes and the error of first dropping resistor 31 or second dropping resistor 38, further can guarantee the linearity of electrical isolation.
Simultaneously, in the technique scheme, be serially connected with a diode, constitute the loop, light emitting diode is shielded, and then protect whole precision photoelectric coupler with light emitting diode in the bypass of light emitting diode.
Embodiment three
Fig. 4 is the on-off circuit structural representation of the embodiment of the invention three; As shown in Figure 4; The on-off circuit that present embodiment provides is one 8 path analoging switch circuit, is a multiplexer switch, comprises 8 tunnel input S1～S8, one tunnel output DOUT and three gating end A0～A2.8 tunnel concrete input S1～S8 are connected with the bus of onboard system; Be used to gather simulating signal; Its output DOUT is connected with the input port VIN (as shown in Figure 3) of linear optical coupling buffer circuit, and gating end A0～A2 is connected with the output terminal of control signal buffer circuit, is used to receive steering order.Concrete principle of work sees embodiment one for details, repeats no more at this.
Present embodiment provides a kind of implementation of on-off circuit, but is not limited to this, along with development of integrated circuits; The model of integrated switching circuit and pattern are more and more; Can select voluntarily according to the actual requirements, for example, the on-off circuit that present embodiment uses is AD508.
Embodiment four
Based on embodiment one, present embodiment provides a kind of implementation of feed circuit, and wherein Fig. 5 is the power supply circuit construction synoptic diagram of the embodiment of the invention four.As shown in Figure 5, the feed circuit that present embodiment provides are realized by a power transfer module additional peripheral circuitry.This power transfer module specifically comprises first input end mouth VI1, the second input port VI2, the first output port VO1, the second output port VO2 and the 3rd output port VO3.Wherein be connected with first capacitor C 1 and the 3rd polar capacitor C13 between the first input end mouth VI1 and the second input port VI2; Be parallel with second capacitor C 2 and the first polar capacitor C11 between the first output port VO1 and second output port, the positive pole of the first polar capacitor C11 is connected with the first output port VO1, and the negative pole of the first polar capacitor C11 is connected with the second output port VO2; Be parallel with the 3rd capacitor C 3 and the second polar capacitor C12 between the second output port VO2 and the 3rd output port VO3, the positive pole of the second polar capacitor C12 is connected with the second output port VO2, and the negative pole of the second polar capacitor C12 is connected with the 3rd output port VO3.
Concrete, first input end mouth VI1 is connected with the power supply VCC of isolation end, and in the present embodiment, power supply VCC is that system provides+5V voltage, and the second input port VI2 is connected with the ground GND of isolation end; The first output port VO1 and the 3rd output port VO3 are used for to by isolation end with between isolation end with by the circuit between the isolation end power supply V2 being provided (like Fig. 3, shown in Figure 4), and the second output port VO2 is used for to by isolation end with between isolation end with by the circuit between the isolation end ground COM (like Fig. 3, shown in Figure 4) being provided.The feed circuit that present embodiment provides can be with+5V voltage transitions for+12V and-12V voltage signal, so that the external circuit power supply to be provided.
Embodiment five
Based on embodiment one, present embodiment provides a kind of implementation of control signal buffer circuit, wherein; Fig. 6 is the control signal buffer circuit structural representation of the embodiment of the invention five; As shown in Figure 6, the control signal buffer circuit that present embodiment provides is realized that by photoelectrical coupler photoelectrical coupler comprises illuminating part and efferent; Based on the 8 path analoging switch circuit that embodiment three provides, present embodiment control signal buffer circuit comprises that three photoelectrical couplers are 601～603.Concrete, be that example describes with photoelectrical coupler 601.
Technical scheme through present embodiment provides can realize the electrical isolation between control signal and the vehicle-mounted microcomputer, and based on the superperformance and the interference free performance of photoelectrical coupler, this embodiment is a kind of preferable implementation.
Based on above-mentioned each embodiment, preferred device or the circuit of realizing technical scheme of the present invention will be provided below, and the device of selection or the characteristics of circuit will be carried out brief account.
Wherein, Controller specifically can be by chip microcontroller, the controller among above-mentioned each embodiment, for example; The model that can adopt Atmel company is 8 single-chip microcomputers of T89C51CC01; This single-chip microcomputer is 8 single-chip microcomputers with 80C51 inner core, and its frequency of operation is 40MHz, and crystal oscillator frequency is 16MHz.This single-chip microcomputer is integrated with RAS (the Random Access Memory of 256 bytes; Abbreviate as: RAM), expansion RAS (On-Chip Expanded RAM in the sheet of 1K byte; Abbreviate as: XRAM), flash memory (FLASH) in the sheet of 32K byte, the EEPROM of 2K byte (Electrically Erasable Programmable Read-Only Memory; Abbreviate as: E
2PROM), built-in 21 WatchDog Timers, 10 analog to digital converters, 3 16 is timer conter, is the controller that meets CAN2.0A, CAN2.0B standard.
Further, for making the work that above-mentioned single chip circuit can be more stable, present embodiment also provides a kind of power reset circuit; The WV that is used for monitoring singlechip; The concrete integrated chip MAX812L that adopts, it can be lower than 4.63V in the WV of single-chip microcomputer or when powering on, supply voltage rises in 140～560ms behind the 4.63V; Produce a high level effective reset signal, to guarantee the required voltage of single-chip microcomputer operate as normal.
Wherein, the CAN EBI is the interface between the physical bus in controller and the onboard system, for example; Can adopt TJA1050T, it has following characteristic: meet the ISO11898 standard, top speed can reach 1Mb/s; Electromagnetic radiation is extremely low, and the electromagnetism anti-interference is high, and input stage can compatible 3.3V and the above device of 5V; The node that does not power on can not cause disturbance to bus, and output driver receives temperature protection, can connect more than 110 node.
And realize with analog signal conversion being the analog to digital converter of digital signal, for example, can adopt 12 analog to digital converter AD7892; It has following characteristics: its input range is 0～+ 10V or 0～-10V; It is 1.47us that input has overvoltage protection, switching time, single power supply; Have serial and parallel two kinds of data output interfaces, the data after this enforcement will be changed with parallel mode offer controller.The scope of its input voltage will adapt with the output voltage of linear optical coupling buffer circuit.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of programmed instruction; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.
Claims (9)
1. an onboard electrical isolated measurement circuit is characterized in that, comprising:
Controller through the control signal buffer circuit, is connected with on-off circuit; The steering order of the said on-off circuit break-make of the control that said controller sends after the said control signal buffer circuit of process carries out electrical isolation, is admitted to said on-off circuit;
The output terminal of said on-off circuit is connected with the input port of a linear optical coupling buffer circuit, and the output terminal of said linear optical coupling buffer circuit is connected with an analog to digital converter, and said analog to digital converter is connected with said controller; Simulating signal by the onboard system of said on-off circuit collection is carried out electrical isolation through said linear optical coupling buffer circuit, and after said analog to digital converter carries out analog to digital conversion, is admitted to said controller to carry out measurement processing;
Feed circuit are connected with said on-off circuit, said linear optical coupling buffer circuit and said control signal buffer circuit, to said on-off circuit, said linear optical coupling buffer circuit and said control signal buffer circuit power supply to be provided.
Said linear optical coupling buffer circuit comprises: first electronic circuit and the output circuit that the positive voltage signal of said input port reception are carried out electrical isolation; Said first electronic circuit comprises: be connected in said input port first dropping resistor, first operational amplifier that is connected with said first dropping resistor, be used to amplify first current amplification circuit, first precision photoelectric coupler of the output of said first operational amplifier; Said first precision photoelectric coupler comprises light emitting diode, feedback subelement that is connected with said first operational amplifier and the output subelement that is connected with said output circuit that is connected with the output terminal of said first current amplification circuit; Said output circuit comprises the 3rd operational amplifier and the output resistance and the output capacitance that are parallel to the inverting input and the output terminal of said the 3rd operational amplifier.
2. onboard electrical isolated measurement circuit according to claim 1 is characterized in that, said linear optical coupling buffer circuit also comprises: second electronic circuit that the negative voltage signal of said input port reception is carried out electrical isolation; Said second electronic circuit comprises: second current amplification circuit and second precision photoelectric coupler of the output terminal that be connected in second dropping resistor of said input port, second operational amplifier that is connected with said second dropping resistor, is connected in said second operational amplifier; The light emitting diode of said second precision photoelectric coupler is connected with said second current amplification circuit; The feedback subelement of said second precision photoelectric coupler is connected with said second operational amplifier, and the output subelement of said second precision photoelectric coupler is connected with said output circuit.
3. onboard electrical isolated measurement circuit according to claim 2 is characterized in that, said first current amplification circuit is made up of a PNP triode; The base stage of said PNP triode is connected with first resistance and second resistance, and the other end of said first resistance is connected in said first operational amplifier output terminal; Said PNP transistor emitter is connected with the 3rd resistance, and said second resistance is connected with power supply with the other end of said the 3rd resistance; The collector of said PNP triode is connected with the light emitting diode of said first precision photoelectric coupler;
Said second current amplification circuit is made up of a NPN triode; The base stage of said NPN triode is connected with the 4th resistance and the 5th resistance, and the other end of said the 4th resistance is connected in the output terminal of said second operational amplifier; The collector of said NPN triode is connected with the 6th resistance, and the other end of said the 5th resistance and said the 6th resistance is connected with said power supply; The emitter of said NPN triode is connected with the light emitting diode of said second precision photoelectric coupler.
4. onboard electrical isolated measurement circuit according to claim 1 is characterized in that said output resistance is serially connected with a variable resistor.
5. onboard electrical isolated measurement circuit according to claim 2 is characterized in that, the feedback subelement of said first precision photoelectric coupler is photodiode or phototriode with the output subelement;
The feedback subelement of said second precision photoelectric coupler is photodiode or phototriode with the output subelement.
6. onboard electrical isolated measurement circuit according to claim 1; It is characterized in that; Said control signal buffer circuit is a photoelectrical coupler, and the input end of said photoelectrical coupler is connected with said controller, and the output terminal of said photoelectrical coupler is connected with the control port of said on-off circuit.
7. onboard electrical isolated measurement circuit according to claim 1 is characterized in that, said feed circuit are a power transfer module, is connected with first electric capacity between the first input end mouth of said power transfer module and second input port; Be parallel with second electric capacity and first polar capacitor between first output port of said power transfer module and second output port; The positive pole of said first polar capacitor is connected with said first output port, and the negative pole of said first polar capacitor is connected with said second output port; Be parallel with the 3rd electric capacity and second polar capacitor between the 3rd output port of said second output port and said power transfer module; The positive pole of said second polar capacitor is connected with said second output port, and the negative pole of said second polar capacitor is connected with said the 3rd output port.
8. onboard electrical isolated measurement circuit according to claim 1 is characterized in that, said on-off circuit is 8 path analoging switch circuit.
9. onboard electrical isolated measurement circuit according to claim 1 is characterized in that, is connected with a buffer between said analog to digital converter and the said controller.
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| CN200910223743A CN102062799B (en) | 2009-11-18 | 2009-11-18 | Vehicle mounted electrical isolation measuring circuit |
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| CN200910223743A CN102062799B (en) | 2009-11-18 | 2009-11-18 | Vehicle mounted electrical isolation measuring circuit |
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| CN102739234B (en) * | 2012-06-15 | 2014-08-27 | 华中科技大学 | Multi-channel digital signal input/output isolating box and power control system |
| CN104135275A (en) * | 2014-07-17 | 2014-11-05 | 沈阳东软医疗***有限公司 | A signal isolator and a method for debugging the signal isolator |
| CN107222195A (en) * | 2017-07-10 | 2017-09-29 | 荣湃半导体（上海）有限公司 | A kind of isolation circuit |
| CN109669503B (en) * | 2018-12-13 | 2022-06-28 | 朱嘉慧 | Isolation amplifier and proportional controlled source, integral controlled source and mutual coupler thereof |
| CN109917305A (en) * | 2019-02-28 | 2019-06-21 | 科世达（上海）管理有限公司 | A kind of isolation signals detection control apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4066973A (en) * | 1976-09-15 | 1978-01-03 | Contraves-Goerz Corporation | Analog signal isolator |
| CN2938119Y (en) * | 2006-08-08 | 2007-08-22 | 浙江德力西电器股份有限公司 | Photoelectric coupling AC voltage separation measuring circuit |
| CN200996990Y (en) * | 2007-01-22 | 2007-12-26 | 深圳市南方电子***工程有限公司 | Battery tester |
| CN201083792Y (en) * | 2007-06-21 | 2008-07-09 | 吴壬华 | Multichannel photoelectric isolation voltage measurement circuit |
| CN101329812A (en) * | 2008-07-24 | 2008-12-24 | 东南大学 | Multi-channel and high-accuracy data acquisition unit |
-
2009
- 2009-11-18 CN CN200910223743A patent/CN102062799B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4066973A (en) * | 1976-09-15 | 1978-01-03 | Contraves-Goerz Corporation | Analog signal isolator |
| CN2938119Y (en) * | 2006-08-08 | 2007-08-22 | 浙江德力西电器股份有限公司 | Photoelectric coupling AC voltage separation measuring circuit |
| CN200996990Y (en) * | 2007-01-22 | 2007-12-26 | 深圳市南方电子***工程有限公司 | Battery tester |
| CN201083792Y (en) * | 2007-06-21 | 2008-07-09 | 吴壬华 | Multichannel photoelectric isolation voltage measurement circuit |
| CN101329812A (en) * | 2008-07-24 | 2008-12-24 | 东南大学 | Multi-channel and high-accuracy data acquisition unit |
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