CN101567142B - Black box system used in electronic circuit experiment - Google Patents

Abstract

The invention provides a black box system used in an electronic circuit experiment. The system comprises a PC upper computer, a main control computer, a black box and operation software containing a black box database. The main control computer is a control system that takes a singlechip as a core and is composed of the singlechip, a radio frequency card reader, an MAX232 convertor and a mini-printer. The black box is internally encapsulated with a tested circuit module and a radio frequency card chip. The card reader in the main control computer reads the card number information of a radio frequency card built in the black box, the database of the black box is built in the PC upper computer, and the main control computer and the PC upper computer compare the card number information with the database through a communication link, thus obtaining the parameters built in the black box. In order to further promote the teaching reform of experimental courses, the invention provides an electronic circuit experiment and examination black box system to be used for 'circuit fundamental' and 'simulation circuit' course experiment and examination, thus creating a new path of experiment and examination.

Description

Black box system used in electronic circuit experiment

(1) technical field

What the present invention relates to is a kind of experimental provision, specifically a kind of discriminating and management system that is suitable for institution of higher learning's electronic circuit experiment and examination.

(2) background technology

Offer comprehensive, Designing Experiment project, the experiment content variation, the examination of experiment course all is a difficult point to all colleges and universities.Current electronic circuit experiment teaching process middle school student is passive, subordinate, as long as carry out according to the process and the wiring diagram on the guide book of experiment of teacher's explanation, need not beat one's brains and can easily accomplish experiment; Especially experimental program is single, and often an experiment has only a cover experimental circuit, and this has just caused the experiment test result similar, makes student's ubiquity in experimentation plagiarize phenomenon; This effect that experiment is cultivated the students practise ability that just weakened has greatly more lacked the cultivate Innovation Ability to the student.

At present, we find to be used for the entity of the black box system of electronic circuit experiment and examination as yet, also do not find that the relevant electronic circuit experiment and the document of examination black box system put down in writing.

(3) summary of the invention

The object of the present invention is to provide a kind of be suitable for institution of higher learning's electronic circuit experiment and examination, have the black box system used in electronic circuit experiment of differentiating with management function.

The objective of the invention is to realize like this:

The operating software composition that it comprises PC host computer, main control computer, black box and includes the black box database; Main control computer is the core control system that black box identification and information are printed, and is made up of single-chip microcomputer, radio-frequency card reader, MAX232 interface, mini-printer; Encapsulation circuit-under-test module and radio-frequency card chip in the black box; When black box during near main control computer, the radio-frequency card reader that main control computer includes reads the sequence number information of the built-in radio-frequency card of black box; And sending this information to the PC host computer through communication link, PC is sequence number information and built-in black box database comparison, thereby obtains the parameter of black box built-in circuit module.

The present invention can also comprise:

The design of black box system used in electronic circuit experiment main control computer: main control computer is a core with single-chip microcomputer (89C51) and MAX232 interface, connects mini-printer, radio-frequency card reader, PC host computer respectively through J1, J2, three sockets of J3; Its concrete structure is as shown in Figure 2, and single-chip microcomputer P1.0～P1.7 connects the mini-printer FPDP via J1 socket 2～9 pins, the parallel print data of importing into; Mini-printer STB, ACK, BUSY, SEL, ERR port respectively via J1 socket the 1st pin, the 10th pin, the 11st pin, the 13rd pin, the 15th pin, connect single-chip microcomputer T0 (P3.4) mouthful, WR (P3.6) mouthful, INT1 (P3.3) mouthful, T1 (P3.5) mouthful, RD (P3.7) mouthful, single-chip microcomputer is implemented control through above-mentioned port to mini-printer; Single-chip microcomputer TXD (P3.1) mouth connects radio-frequency card reader REST1 mouth via J2 socket the 2nd pin, and the control radio-frequency card reader resets; Radio-frequency card reader RFCAD mouth connects MAX232 interface T2IN end via J2 socket the 3rd pin; After level conversion, export J3 socket the 2nd pin to by MAX232 interface T2OUT end; This pin connects PC host computer serial input port, and the radio-frequency card chip serial number that radio-frequency card reader is read sends the PC host computer to via above-mentioned communication link; PC host computer serial delivery outlet is connected to MAX232 interface R1IN end via J3 socket the 3rd pin, after level conversion, is connected to single-chip microcomputer RXD (P3.0) by the R1OUT end, and the type information of PC host computer sends single-chip microcomputer to through above-mentioned communication link.

The present invention provides a kind of electronic circuit experiment and examination black box system in order further to advance the reform in education of experiment course, is used for " circuit base ", " mimic channel " curriculum experiment and examination, the solely out-of-the-way new way of experiment with examination.

So-called black box is claimed black box again, and its basic thought is that certain element or circuit are placed in the plastic box of cigarette case size, and there is connection terminal the outside.The face shaping of each black box is identical, and inner element and circuit of inserting has nothing in common with each other, and performance parameter is varied.The student in unknown black box, adorn what thing situation under, record the element or the circuit parameter of black box through laboratory facilities, this is the essence of black box just.Because each black box built-in circuit is different, introduce experimental teaching to black box and can make each student's experimental circuit different, impel the student independently to accomplish experiment, stop to plagiarize; Especially be applied in the experimental evaluation, guarantee that the result of appraisal are fair and rational.

It is the basis of Designing Experiment to quantitative measurment that black box has been realized by observational measurement, because the student in advance and do not know the 26S Proteasome Structure and Function that black box is inner, can be considered an integrated system.Thereby the experiment that each student did is all inequality, and the contrived experiment scheme is set up test condition voluntarily, the assembling experimental circuit, and independent the completion tested.The black box experimental system can provide a kind of Designing Experiment thinking of novelty, and for independently problem analysis of raising student, problem-solving ability, and the integration test ability is useful.

Black box provides new way for experimental evaluation again.For the examination of practice type course, can not standard nomenclature as theoretical course, concentrate and take an examination, so experimental evaluation becomes the difficult point of Reform of Experiment Teaching.The black box examination can be accomplished " people one case ", or even " the many casees of a people ", when examination; The student takes black box then and there; Each student's experimental result is all inequality, has stopped the student effectively and has plagiarized experimental data mutually, for experimental evaluation provides fair and just platform.

(4) description of drawings

Fig. 1 is a formation block diagram of the present invention;

Fig. 2 is a main control computer hardware system synoptic diagram of the present invention.

(5) embodiment

For example the present invention is done description in more detail below in conjunction with accompanying drawing:

In conjunction with Fig. 1, the operating software composition that the composition of black box system used in electronic circuit experiment of the present invention comprises PC host computer, main control computer, black box and includes the black box database; Encapsulation circuit-under-test module and radio-frequency card chip in the black box; Main control computer is the core control system that black box identification and information are printed, and it is made up of single-chip microcomputer, radio-frequency card reader, MAX232 interface, mini-printer; When black box during near main control computer; Radio-frequency card reader in the main control computer is read black box and is included the radio frequency chip numbering and transmit the PC host computer through the MAX232 interface; Host computer obtains encapsulation circuit-under-test module parameter in the black box with information and the comparison of black box database; And circuit module parameter and corresponding type information sent back single-chip microcomputer through the MAX232 interface, Single-chip Controlling serial mini-printer prints.

In conjunction with Fig. 2, main control computer (Fig. 1) is a core with single-chip microcomputer (89C51) and MAX232 interface, connects mini-printer, radio-frequency card reader, PC host computer respectively through J1, J2, three sockets of J3.Black box built-in radio-frequency card sequence number is read by card reader and is connected to the MAX232-T2IN pin through J2 the 3rd pin and converts 232 level into, exports PC host computer serial type data input port to by the T2OUT pin, accomplishes black box data identification and transmission; Content after the PC host computer will be handled comprises: component parameters, experimental period, instructor wait for that type information passes single-chip microcomputer back by R1OUT pin (being connected to RXD) after the MAX232-R1IN pin converts Transistor-Transistor Logic level into; Single-chip microcomputer is controlled little shape printer prints through the J1 socket; Wherein single-chip microcomputer T0 (P3.4) connects STB, and rising edge triggers little beating and reads in data; P1.0～P1.7 connects J1 the 2nd～9 pin, the parallel print data of importing into; WR (P3.6) connects ACK, and little returning should " low " decibel meter registration certificate be accepted; INT1 (P3.3) connects BUSY, and " height " level is represented the just busy data that do not receive of printer; T1 (P3.5) connects SEL, and " height " level representes that printer is online; RD (P3.7) connects ERR, and " height " level is represented little non-fault of beating; In addition, single-chip microcomputer RESET is connected to the IMP813L hardware watchdog, anti-locking system " deadlock ".Main control computer links to each other with PC, configuration information identification, detection and output system.

Encapsulation circuit-under-test module and radio-frequency card chip in the black box module.The component parameters accuracy requirement of circuit-under-test module is very high, must demarcate in advance.For example circuit-under-test is the anti-phase proportional amplifier, needs to adopt accurate proportion resistor, and the circuit that is barricaded as needs through the strictness test, and the parameter of measuring is as standard value.The radio-frequency card chip can be used as the numbering of black box in advance by manufacturer's writing sequence number, and the numbering of all black boxes is all different, and numbering is unique corresponding with the interior each item canonical parameter of black box, in several storehouses of typing PC.When the card reader of black box near main control computer, relatively discern through MCU, the numbering that MCU transmits is by the retrieval of PC host computer, the PC host computer will with this numbering the canonical parameter of corresponding black box show, and through mini-printer printing experimental result.

Native system need be worked out supporting software, gathers the black box parameter through PC PC control slave computer, and on human-computer interaction interface, shows relevant information, and the software major function comprises:

◆ functions such as the typing of black box parameter, modification and deletion;

◆ the identification of black box numbering;

◆ the retrieval of black box numbering;

◆ experiment timing (experiment began to the time-write interval), Test Information functions such as (experiment teacher, experiment exercise questions);

◆ the black box canonical parameter is printed.

Effect intentionally of the present invention is:

The present invention is used for electronic circuit experiment and examination, and its meaning is attempted the example explanation.

Example 1: in " circuit base " experiment, black box in-built electrical sensor is short circuit although the student relies on multimeter can measure it, the inductance of can judging that Here it is, and how much inductance numerical value is, but must take out the RL test circuit, and are as shown in Figure 2.Wherein R is the sample resistance less than 10 Ω, utilizes oscillograph, signal source to measure U _I, U _RWaveform, judge it is inductive element or capacitive element according to input and output are leading with the relation that lags behind, utilize formula at last $U_I\&ap;U_L=\mathrm{\&omega;\; LI}=\mathrm{\&omega;\; L}\frac{U_R}{R}$ Calculate inductance value.Owing to ignored ohmically voltage drop when calculating, certain error is arranged, allow on the engineering.Certainly, also can strengthen R value (not as sample resistance), measure U with milivoltmeter _I, U _RVoltage effective value utilizes $U_I=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="U\; L"\; filenames="DEST\_PATH\_HA20169978200910071960601E00011.png"\; state="\{\{state\}\}">U</figure-callout>}}_L^{}+{\mathrm{<figure-callout\; id="2"\; label="U\; R"\; filenames="DEST\_PATH\_HA20169978200910071960601E00011.png"\; state="\{\{state\}\}">U</figure-callout>}}_R^{}}$ Obtain U _L, again by $U_L=\mathrm{\&omega;\; L}\frac{U_R}{R}$ Obtain inductance.On the surface, such experiment is very simple, in fact this experimental applications knowledge such as measuring technique, RLC element characteristic, polar plot, computing formula, theory of errors.

Example 2: in " mimic channel " experiment, the black box incorporated amplifier utilizes oscillograph, the bandwidth of signal source test amplifier, gain, input resistance, output resistance, degree of distortion, can differentiate that also homophase amplifies or anti-phase is amplified, and test event is many.In fact this experiment belongs to the measurement of twoport active network, relates to key concepts such as measuring technique, network technology index and definition, engineering calculation.

Imitative this, the built-in totalizer based on amplifier of black box, integrator, voltage comparator, active filter all can be used as the experiment module of black box, so the experimental project of black box have extensibility.

Claims (1)

1. a black box system used in electronic circuit experiment is characterized in that: the operating software composition that it comprises PC host computer, main control computer, black box and includes the black box database; Encapsulation circuit-under-test module and radio-frequency card chip in the black box; Main control computer is the core control system that black box identification and information are printed, and it is made up of single-chip microcomputer, radio-frequency card reader, MAX232 interface, mini-printer; When black box during near main control computer; Radio-frequency card reader in the main control computer is read black box and is included the radio frequency chip numbering and transmit the PC host computer through the MAX232 interface; Host computer obtains encapsulation circuit-under-test module parameter in the black box with information and the comparison of black box database; And circuit module parameter and corresponding type information sent back single-chip microcomputer through the MAX232 interface, Single-chip Controlling serial mini-printer prints; Main control computer is a core with 89C51 single-chip microcomputer and MAX232 interface, and (J1, J2, J3) connects mini-printer, radio-frequency card reader, PC host computer respectively through three sockets; Single-chip microcomputer P1.0～P1.7 connects the mini-printer FPDP via first socket (J1), 2～9 pins, the parallel print data of importing into; Mini-printer

ACK, BUSY, SEL, ERR port respectively via first socket (J1) the 1st pin, the 10th pin, the 11st pin, the 13rd pin, the 15th pin connect single-chip microcomputer T0 (P3.4) mouthful,

(P3.6) mouthful, INT1 (P3.3) mouthful, T1 (P3.5) mouthful,

(P3.7) mouthful, single-chip microcomputer is implemented control through above-mentioned port to mini-printer; Single-chip microcomputer TXD (P3.1) mouth connects radio-frequency card reader REST1 mouth via second socket (J2) the 2nd pin, and the control radio-frequency card reader resets; Radio-frequency card reader RFCAD mouth connects MAX232 interface T2IN end via second socket (J2) the 3rd pin; After level conversion, export the 3rd socket (J3) the 2nd pin to by MAX232 interface T2OUT end; This pin connects PC host computer serial input port, and the radio-frequency card chip serial number that radio-frequency card reader is read sends the PC host computer to via above-mentioned communication link; PC host computer serial delivery outlet is connected to MAX232 interface R1IN end via the 3rd socket (J3) the 3rd pin, after level conversion, is connected to single-chip microcomputer RXD (P3.0) by the R1OUT end, and the type information of PC host computer sends single-chip microcomputer to through above-mentioned communication link.

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