CN102842257B - Frequency conversion simple alternating current characteristic demonstrating device - Google Patents
Frequency conversion simple alternating current characteristic demonstrating device Download PDFInfo
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- CN102842257B CN102842257B CN201210275850.3A CN201210275850A CN102842257B CN 102842257 B CN102842257 B CN 102842257B CN 201210275850 A CN201210275850 A CN 201210275850A CN 102842257 B CN102842257 B CN 102842257B
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Abstract
The object of patent of the present invention makes up the deficiencies in the prior art exactly, provides a kind of demonstration device for demonstrating sinusoidal wave frequency-changing AC circuit characteristic, and energy visualize goes out the characteristic of alternating current, improves demonstrating precision.For reaching described object, frequency conversion simple alternating current characteristic demonstrating device of the present invention, power unit, indicating section and demonstration part, described power unit is made up of the triangular-wave generator connected successively, Sine wave shaping circuit, sinusoidal power amplifying circuit, described demonstration part comprises load circuit resistance, inductance, capacitive branch in parallel, is provided with detachable electron element and 1 miniature bulb of connecting respectively in each branch road.The present invention, by changing the frequency of variable-frequency power sources, bright, the dark situation of change of the bulb of connecting in observable resistance, inductance, capacitive branch, can detect perfect sinusoidal waveform simultaneously from oscillograph.Can more intuitively to student's demonstration, the feature explaining sine wave alternating current.
Description
Technical field
The present invention relates to a kind of teaching aid, specifically a kind of demonstration device for demonstrating sinusoidal wave frequency-changing AC circuit characteristic.
Background technology
Classroom will allow students keep some knowledge points fast firmly in mind, teachers association selects various teaching aid aided education.As when upper electricity basis, alternating circuit characteristic demonstrating device will be used.But this product after listing in the nineties in outfit catalogue, past nearly 20 years, this product is always very chaotic.This series products has two classes substantially: a class is inductance capacitance phase differential in performance alternating circuit, and another kind of is induction reactance in performance alternating circuit and capacitive reactance.Alternating circuit characteristic demonstrating device of the prior art produces square wave analog alternating current by direct current through commutator, and the shortcoming brought like this is larger with the difference of actual alternating current.In fact the alternating current used with reality makes a big difference, and is unfavorable for Students ' Learning electricity knowledge.And if frequency conversion sinusoidal ac will be done, then more difficult, variable-frequency power sources is used to adaptive to supply frequency of surveying instrument equipment, is exactly the adjustable sine-wave power of ultralow frequency.The composition of the circuit of adjustable ultralow frequency AC power is an adjustable sine wave source in fact, adds a sinusoidal power amplifier.Obviously, sinusoidal power amplifier needs level pressure to export.Such as, but the sinusoidal power amplifier that level pressure exports not is sophisticated technology, but what generally apply, in level pressure audible sine power amplifier, only needs plus depth negative feedback.If disregard cost, not can not make.But it is envisaged that whether there is this necessity.After all as the universal teaching aid used, cost is also the problem needing to consider.To this, we further investigate, and develop a kind of teaching aid taking into account cost of manufacture and teaching efficiency, fill up this blanking technique.
Summary of the invention:
The object of patent of the present invention makes up the deficiencies in the prior art exactly, provides a kind of demonstration device for demonstrating sinusoidal wave frequency-changing AC circuit characteristic, and energy visualize goes out the characteristic of alternating current, improves demonstrating precision, also reduces production cost as far as possible simultaneously.
For reaching described object, frequency conversion simple alternating current characteristic demonstrating device of the present invention, power unit, indicating section and demonstration part, described power unit is by the triangular-wave generator connected successively, Sine wave shaping circuit, sinusoidal power amplifying circuit forms, indicating section comprises binary digit frequency meter, frequency test signal is from the square-wave signal of comparison amplifier, also comprise external-connected port, described external-connected port connects oscillograph, described demonstration part comprises load circuit resistance in parallel, inductance, capacitive branch, detachable electron element is provided with and 1 miniature bulb of connecting respectively in each branch road.
Preferably, described triangular-wave generator is all made up of apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, electric capacity C, current-limiting resistance R, frequency adjustment potentiometer RP1 forms integrator, produce triangular signal, comparison amplifier and integrator join end to end, form closed loop circuit, form stable triangular wave oscillator, in formation feedback circuit, in order to little as far as possible on the discharge and recharge impact of electric capacity C, adopt field effect transistor V9 as source follower in circuit, with the input impedance that the electric capacity C improving discharge and recharge holds, reduce the impedance of triangular wave output terminal, triangular wave output terminal is connected with the input end base stage of the comparison amplifier that triode V2 forms.
Preferably, described Sine wave shaping circuit comprises the triangular signal exported by source follower, by regulating RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave in the knee region of diode cut-off with conducting, deliver to after operational amplifier does further deburring shaping, export the input end that perfect sinusoidal waveform delivers to sinusoidal power amplifying circuit.
Preferably, the TDA3001D1 that described sinusoidal power amplifying circuit adopts TIX to produce, 20W monophonic audio sinusoidal power amplifier, the sine wave signal exported by operational amplifier sends into monophonic audio power amplifier integrated circuit 2 pin in-phase input end, the BTL pin of monophonic audio power amplifier exports 10V voltage, for load circuit.
Preferably, described power unit, indicating section and demonstration part are installed on base, are provided with drawer in described base, and the refill-unit of the detachable electron element in load circuit is placed in drawer.The test that such structure same equipment demonstration easy to use is dissimilar.
The present invention, by changing the frequency of variable-frequency power sources, bright, the dark situation of change of the bulb of connecting in observable R, L, C branch road, can detect perfect sinusoidal waveform simultaneously from oscillograph.Can more intuitively to student's demonstration, the feature explaining sine wave alternating current.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of frequency conversion simple alternating current characteristic demonstrating device of the present invention.
Fig. 2 is the triangular-wave generator of frequency conversion simple alternating current characteristic demonstrating device of the present invention and the circuit diagram of Sine wave shaping circuit.
Fig. 3 is the sinusoidal power amplification circuit diagram of frequency conversion simple alternating current characteristic demonstrating device of the present invention.
Wherein Fig. 2 connects that connecting circuit on the left of the circuit of power amplification circuit and Fig. 3 links together.
Embodiment:
As shown in Figure 1, Figure 2 and shown in Fig. 3, frequency conversion simple alternating current characteristic demonstrating device, power unit 1, indicating section 2 and demonstration part 3, it is characterized in that: described power unit 1 is made up of the triangular-wave generator connected successively, Sine wave shaping circuit, sinusoidal power amplifying circuit, indicating section 2 comprises binary digit frequency meter, frequency test signal is from the square-wave signal of comparison amplifier, also comprise external-connected port 4, described external-connected port 4 connects oscillograph, described demonstration part 3 comprises load circuit R, L, C branch road in parallel, and each branch road is connected 1 miniature bulb 5 respectively.Described triangular-wave generator is all made up of apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, electric capacity C, current-limiting resistance R, frequency adjustment potentiometer RP1 forms integrator, produce triangular signal, comparison amplifier and integrator join end to end, form closed loop circuit, form stable triangular wave oscillator, in formation feedback circuit, in integrator, R is constant current source resistance, when change RP1 ↑ → Va ↑ → VR ↑ → IR ↑ → F (Hz) ↑, otherwise Rp1 ↓ → Va ↓ → VR ↓ → IR ↓ → F (Hz) ↓, because electric capacity adopts constant current charge-discharge, and when forming closed loop circuit, on the discharge and recharge of electric capacity without impact, such triangular wave linear better, triangular wave nonlinear distortion γ △ <1%, triangular wave is more symmetrical, little for forming percentage distortion, the sine wave that shape is good is laid a good foundation, particularly the change of frequency range is very linear, the triangular-wave generator of operation amplifier circuit composition can never be resembled, at the low side of frequency, the resistance changing frequency is dredged, high-end in frequency, change frequency resistance close, frequency adjustment linearly bad.Because circuit takes other some indemnifying measures, when changing triangular wave frequency, output amplitude remains unchanged, and has good amplitude versus frequency characte.The square-wave signal that in figure, triode V10 emitter follower exports delivers to the input end of binary digit frequency meter, as detection and the display of signal frequency.In order to little as far as possible on the discharge and recharge impact of electric capacity C, adopt field effect transistor V9 as source follower in circuit, with the input impedance that the electric capacity C improving discharge and recharge holds, reduce the impedance of triangular wave output terminal, triangular wave output terminal is connected with the input end base stage of the comparison amplifier that triode V2 forms.Described Sine wave shaping circuit comprises the triangular signal exported by source follower, by regulating RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave in the knee region of diode cut-off with conducting, deliver to after operational amplifier does further deburring shaping, export the input end that perfect sinusoidal waveform delivers to sinusoidal power amplifying circuit.The TDA3001D1 that described sinusoidal power amplifying circuit adopts TIX to produce, 20W monophonic audio sinusoidal power amplifier 9, the sine wave signal exported by operational amplifier sends into monophonic audio power amplifier 9 integrated circuit 2 pin in-phase input end, the BTL pin of monophonic audio power amplifier 9 exports 10V voltage, for load circuit.Described sine wave signal generator, frequency range 1Hz ~ 60Hz.Described binary digit frequency meter display, resolution is 1Hz.
Described power unit 1, indicating section 2 and demonstration part 3 are installed on base 7, and be provided with drawer 8 in described base 7, the refill-unit of the detachable electron element 6 in load circuit is placed in drawer 8.Visible, load circuit R, L, C branch road, also can carry out phase co-conversion by the detachable electron element 6 changing grafting according to actual needs, such range of application is larger.
By described structure, the present invention obtains the adjustable sine ac power supply of a standard by ball bearing made using, for demonstration.Cost is low, and security performance is good, uses the present invention that continuously adjustabe frequency conversion sine ac power supply can be made to reach following effect during demonstration.
1, the detachable electron element 6 of acquiescence is used, i.e. resistance, electric capacity and inductance, along with supply frequency raises gradually, bulb 5 brightness be connected in inductor circuit reduces gradually, be connected on the bulb 5 brightness blast gradually in capacitor circuit, be connected on bulb 5 brightness in resistor circuit constant.
2, detachable electron element 6 two capacitors using capacity different and a resistor, along with supply frequency raises gradually, first the bulb 5 be connected in large value capacitor circuit is lit, the bulb 5 be connected in low value capacitor circuit continues just to be lit when raising in frequency, and bulb 5 brightness be connected in resistance circuit is constant all the time;
3, detachable electron element 6 two inductors selecting inductance value different and a resistor, along with supply frequency raises gradually, be connected on bulb 5 in large inductive circuit first brightness be reduced to extinguishing, bulb 5 brightness when frequency continues to raise be connected in small inductor circuit is just reduced to extinguishing, and bulb 5 brightness be connected in resistance circuit is constant all the time;
4, in above process, frequency meter energy display power supply frequency change; The frequency of the oscilloscope display that external-connected port 4 connects gradually changes, but waveform is always sinusoidal wave, and peak-to-peak value amplitude is constant.
Can be more directly perceived by such effect, explain the characteristic of sine wave alternating current more accurately to student, improve the quality of teaching.
Claims (1)
1. frequency conversion simple alternating current characteristic demonstrating device, by power unit (1), indicating section (2) and demonstration part (3) composition, it is characterized in that: described power unit (1) is by the triangular-wave generator connected successively, Sine wave shaping circuit, sinusoidal power amplifying circuit forms, indicating section (2) comprises binary digit frequency meter, frequency test signal is from the square-wave signal of comparison amplifier, indicating section (2) also comprises external-connected port (4), described external-connected port (4) connects oscillograph, described demonstration part (3) comprises load circuit resistance in parallel, inductance, capacitive branch, detachable electron element (6) is provided with and 1 miniature bulb (5) of connecting respectively in each branch road, described triangular-wave generator is all made up of apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, electric capacity C, current-limiting resistance R, frequency adjustment potentiometer RP1 form integrator, produce triangular signal, comparison amplifier and integrator join end to end, and form closed loop circuit, form stable triangular wave oscillator, in formation closed loop circuit, in order to little as far as possible on the discharge and recharge of electric capacity C impact, adopt field effect transistor V9 as source follower in circuit, during to improve discharge and recharge, the input impedance of electric capacity C end, reduces the impedance of triangular wave output terminal, triangular wave output terminal is connected with the input end base stage of the comparison amplifier that triode V2 forms, described Sine wave shaping circuit comprises the triangular signal exported by source follower, by regulating RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave in the knee region of diode cut-off with conducting, deliver to after operational amplifier does further deburring shaping, export the input end that perfect sinusoidal waveform delivers to sinusoidal power amplifier, the TDA3001D1 that described sinusoidal power amplifying circuit adopts TIX to produce, 20W monophonic audio power amplifier (9), the sine wave signal exported by operational amplifier sends into monophonic audio power amplifier (9) integrated circuit 2 pin in-phase input end, the BTL pin of monophonic audio power amplifier (9) exports 10V voltage, for load circuit, described power unit (1), indicating section (2) and demonstration part (3) are installed on base (7), and be provided with drawer (8) in described base (7), the refill-unit of the detachable electron element (6) in load circuit is placed in drawer (8).
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| CN201210275850.3A CN102842257B (en) | 2012-08-03 | 2012-08-03 | Frequency conversion simple alternating current characteristic demonstrating device |
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| CN201210275850.3A CN102842257B (en) | 2012-08-03 | 2012-08-03 | Frequency conversion simple alternating current characteristic demonstrating device |
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| CN102842257B true CN102842257B (en) | 2016-02-10 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103439579A (en) * | 2013-08-30 | 2013-12-11 | 昆山奥德鲁自动化技术有限公司 | Economical impedance measurement circuit |
| CN110619789A (en) * | 2018-06-18 | 2019-12-27 | 合肥探奥自动化有限公司 | Demonstration device for capacitor science popularization |
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| CN202855149U (en) * | 2012-08-03 | 2013-04-03 | 湖州文思必得科教仪器有限公司 | Frequency conversion sine AC characteristic demonstration device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3805414A (en) * | 1972-06-02 | 1974-04-23 | Singer Co | Synchroscope training device |
| CN2110257U (en) * | 1991-12-11 | 1992-07-15 | 余侃 | Multi-type waveform signal generator |
| DE19723598C1 (en) * | 1997-06-05 | 1999-02-04 | Lothar Schmid | Presentation arrangement for correlation between power plant and number of loads |
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Effective date of registration: 20171130 Address after: Lang Jun Center No. 28 road 401120 Chongqing city Yubei District Huanglong longta Street No. 3 11-6 Patentee after: Chongqing music science and Technology Co., Ltd. Address before: 313100 Changxing County peace Town, Changxing County, Huzhou, Zhejiang Province, Huzhou Vince must science and Education Instrument Co., Ltd. Patentee before: Huzhou Wensi Bide Scientific Educational Instrument Co., Ltd. |
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Address after: 401120 Longta Street, Yubei District, Chongqing City, 28 Huanglong Road, Langjun Center, 3 Blocks 11-6 Patentee after: Chongqing Lexue Science and Technology Group Co., Ltd. Address before: 401120 Longta Street, Yubei District, Chongqing City, 28 Huanglong Road, Langjun Center, 3 Blocks 11-6 Patentee before: Chongqing music science and Technology Co., Ltd. |