CN202855149U - Frequency conversion sine AC characteristic demonstration device - Google Patents
Frequency conversion sine AC characteristic demonstration device Download PDFInfo
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- CN202855149U CN202855149U CN 201220383816 CN201220383816U CN202855149U CN 202855149 U CN202855149 U CN 202855149U CN 201220383816 CN201220383816 CN 201220383816 CN 201220383816 U CN201220383816 U CN 201220383816U CN 202855149 U CN202855149 U CN 202855149U
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Abstract
The present utility model discloses a demonstration device for demonstrating sine wave frequency conversion AC circuit characteristics, the device can be used for overcoming shortages of the prior art, visually demonstrate AC characteristics and enhance demonstration precision. The frequency conversion sine AC characteristic demonstration device comprises a power supply part, an indication part and a demonstration part, the power supply part is composed of a triangle generator, a sine wave shaping circuit and a sine power amplification circuit which are successively connected, the demonstration part comprises a load circuit resistor, an inductor and a capacitor which are connected in parallel, and each branch is provided with a detachable electronic component and is respectively connected with one bulb in series. Through changing frequency of a frequency conversion power supply, light and dark changing situations of the series-connected bulbs of the resistor, inductor and capacitor branches can be observed, perfect sine wave form can be detected from an oscilloscope. Sine wave AC characteristics can be more visually demonstrated and explained to students.
Description
Technical field
The utility model relates to a kind of teaching aid, specifically a kind of demonstration device be used to demonstrating sinusoidal wave frequency-changing AC circuit characteristic.
Background technology
Will allow students keep fast some knowledge points firmly in mind on the classroom, the teachers association selects various teaching aid aided educations.As when upper electricity is basic, will use alternating circuit characteristic demonstrating device.But this product the nineties be equipped with list in the catalogue after, nearly 20 years are in the past, this product is always very chaotic.This series products has two classes substantially: a class is inductance capacitance phase differential in the performance alternating circuit, and another kind of is induction reactance in the performance alternating circuit and capacitive reactance.Alternating circuit characteristic demonstrating device of the prior art is to produce the square wave analog alternating current by direct current through commutator, and the shortcoming of bringing like this is larger with the difference of actual alternating current.In fact the alternating current with the reality use has very large difference, is unfavorable for the Students ' Learning electricity knowledge.And if do the frequency conversion sinusoidal ac, what difficulty relatively then, variable-frequency power sources were surveying instrument equipment to supply frequency is adaptive, 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 power amplifier.Obviously, power amplifier needs level pressure output.But the power amplifier of level pressure output is not sophisticated technology, but what generally use, for example in the constant-pressure audio power amplifier, only needs the plus depth negative feedback.If disregard cost, not can not make.But whether what need consideration has had this necessity.As popularizing the teaching aid that uses, cost also is a problem that needs consideration after all.We further investigate to this, develop a kind of teaching aid that can take into account cost of manufacture and teaching efficiency, fill up this blank technology.
The utility model content:
The purpose of the utility model patent remedies the deficiencies in the prior art exactly, and a kind of demonstration device be used to demonstrating sinusoidal wave frequency-changing AC circuit characteristic is provided, and the energy visualize goes out the characteristic of alternating current, improves demonstrating precision, also reduces production costs as far as possible simultaneously.
For reaching described purpose, the utility model frequency conversion simple alternating current characteristic demonstrating device, by power unit, indicating section and demonstration part form, described power unit is by the triangular-wave generator that connects successively, Sine wave shaping circuit, sinusoidal power amplification circuit forms, indicating section comprises the binary digit frequency meter, the 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 is provided with the detachable electron element and 1 miniature bulb of connecting respectively in each branch road.
Preferably, described triangular-wave generator all is comprised of the apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, capacitor C, current-limiting resistance R, frequency adjustment potentiometer RPl forms integrating circuit, produce triangular signal, comparer and integrator join end to end, form closed loop circuit, consist of stable triangular wave oscillator, in forming feedback circuit, for on integrating capacitor C to discharge and recharge impact as far as possible little, in circuit, adopt field effect transistor V9 as source follower, to improve the input impedance of charge and discharge capacitance C end, reduce the impedance of triangular wave output terminal, the triangular wave output terminal is connected with the input end base stage of the comparison amplifying circuit that triode V2 forms.
Preferably, described Sine wave shaping circuit comprises the triangular signal with source follower output, by regulating the RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave end with the flex point of conducting regional at diode, after delivering to operational amplifier and doing further deburring shaping, export the input end that perfect sinusoidal waveform is delivered to power amplifier.
Preferably, the TDA3001D1 that described sinusoidal power amplification circuit adopts TIX to produce, 20W monophonic audio power amplifier is sent into power amplifier integrate circuit 2 pin in-phase input ends by the sine wave signal of amplifier output, the BTL output 10Vp_p voltage of power amplifier is for load circuit.
Preferably, described power unit, indicating section and demonstration partly are installed on the base, are provided with drawer in the described base, and the refill-unit of the detachable electron element in the load circuit is placed in the drawer.The dissimilar test of such structure same equipment demonstration easy to use.
The utility model is by changing the frequency of variable-frequency power sources, and bright, the dark situation of change of the bulb of connecting in observable R, L, the C branch road can detect perfect sinusoidal waveform simultaneously from oscillograph.Can demonstrate, explain more intuitively the characteristics of sine wave alternating current to the student.
Description of drawings:
Fig. 1 is the structural representation of the utility model frequency conversion simple alternating current characteristic demonstrating device.
Fig. 2 is the triangular-wave generator of the utility model frequency conversion simple alternating current characteristic demonstrating device and the circuit diagram of Sine wave shaping circuit.
Fig. 3 is the sinusoidal power amplification circuit figure of the utility model frequency conversion simple alternating current characteristic demonstrating device.
Wherein Fig. 2 connects that the circuit of power amplification circuit and Fig. 3 left side connecting circuit link together.
Embodiment:
Such as Fig. 1, Fig. 2 and shown in Figure 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 comprised of the triangular-wave generator, Sine wave shaping circuit, the sinusoidal power amplification circuit that connect successively, indicating section 2 comprises the binary digit frequency meter, the 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 in parallel load circuit R, L, C branch road, each branch road 1 miniature bulb 5 of connecting respectively.Described triangular-wave generator all is comprised of the apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, capacitor C, current-limiting resistance R, frequency adjustment potentiometer RPl forms integrating circuit, produce triangular signal, comparer and integrator join end to end, form closed loop circuit, consist of stable triangular wave oscillator, in forming feedback circuit, in integrating circuit, R is constant current source resistance, when change RP1 ↑ → Va ↑ → VR ↑ → IR ↑ → F (Hz) ↑, otherwise Rp1 ↓ → Va ↓ → VR ↓ → IR ↓ → F (Hz) ↓, because integrating capacitor adopts constant current charge-discharge, and when forming closed loop circuit, on discharging and recharging without impact of electric capacity, triangular wave is linear better like this, the nonlinear distortion γ of triangular wave △＜1%, triangular wave is more symmetrical, little for forming percentage distortion, the sine wave that shape is good is laid a good foundation, and particularly the variation of frequency range is very linear, can never resemble the triangular-wave generator that discharge circuit forms, at the low side of frequency, the resistance that changes frequency is dredged, high-end in frequency, change the frequency resistance close, frequency adjustment linear bad.Because circuit has been taked other some indemnifying measures, when changing the triangular wave frequency, output amplitude remains unchanged, and has good amplitude versus frequency characte.The square-wave signal of triode V10 emitter follower output is delivered to the input end of binary digit frequency meter among the figure, as detection and the demonstration of signal frequency.For on integrating capacitor C to discharge and recharge impact as far as possible little, in circuit, adopt field effect transistor V9 as source follower, to improve the input impedance of charge and discharge capacitance C end, reduce the impedance of triangular wave output terminal, the triangular wave output terminal is connected with the input end base stage of the comparison amplifying circuit that triode V2 forms.Described Sine wave shaping circuit comprises the triangular signal with source follower output, by regulating the RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave end with the flex point of conducting regional at diode, after delivering to operational amplifier and doing further deburring shaping, export the input end that perfect sinusoidal waveform is delivered to power amplifier.The TDA3001D1 that described sinusoidal power amplification circuit adopts TIX to produce, 20W monophonic audio power amplifier 9, sine wave signal by amplifier output is sent into power amplifier integrate circuit 2 pin in-phase input ends, and the BTL output 10Vp_p voltage of power amplifier is for load circuit.Described sine wave signal generator, frequency range 1Hz～60Hz.Described binary digit frequency meter demonstration, resolution is 1Hz.
Described power unit 1, indicating section 2 and demonstration part 3 are installed on the base 7, are provided with drawer 8 in the described base 7, and the refill-unit of the detachable electron element 6 in the load circuit is placed in the drawer 8.As seen, load circuit R, L, C branch road also can carry out the phase co-conversion by changing the detachable electron element 6 of pegging graft according to actual needs, and range of application is larger like this.
By described structure, the utility model obtains the adjustable sine ac power supply of a standard by ball bearing made using, be used for demonstration.Cost is low, and security performance is good, uses the utility model can make continuous adjustable frequency conversion sine ac power supply reach following effect during demonstration.
1, uses the detachable electron element 6 of acquiescence, be resistance, electric capacity and inductance, along with supply frequency raises gradually, bulb 5 brightness that are connected in the inductor circuit reduce gradually, be connected on the gradually blast of bulb 5 brightness in the capacitor circuit, be connected in the resistor circuit bulb 5 brightness constant.
2, different two capacitors and resistors of detachable electron element 6 use capacity, along with supply frequency raises gradually, the bulb 5 that is connected in the large value capacitor circuit at first is lit, the bulb 5 that is connected in the low value capacitor circuit just is lit when frequency continues to raise, and bulb 5 brightness that are connected in the resistance circuit are constant all the time;
3, detachable electron element 6 is selected inductance value different two inductors and a resistor, along with supply frequency raises gradually, be connected in the large inductive circuit bulb 5 at first brightness be reduced to and extinguish, be connected on bulb 5 brightness when frequency continue to raise in the small inductor circuit and just be reduced to and extinguish, bulb 5 brightness that are connected in the resistance circuit are constant all the time;
4, in said process, frequency meter energy display power supply frequency change; The frequency of the oscilloscope display that external-connected port 4 connects gradually changes, and is sinusoidal wave but waveform is always, and the peak-to-peak value amplitude is constant.
Can be more directly perceived by such effect, explain more accurately the characteristic of sine wave alternating current to the student, improved the quality of teaching.
Claims (5)
1. frequency conversion simple alternating current characteristic demonstrating device, by power unit (1), indicating section (2) and demonstration part (3) form, it is characterized in that: described power unit (1) is by the triangular-wave generator that connects successively, Sine wave shaping circuit, sinusoidal power amplification circuit forms, indicating section (2) comprises the binary digit frequency meter, the 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 resistance in parallel, inductance, capacitive branch is provided with detachable electron element (6) and 1 miniature bulb (5) of connecting respectively in each branch road.
2. frequency conversion simple alternating current characteristic demonstrating device as claimed in claim 1, it is characterized in that: described triangular-wave generator all is comprised of the apportion device, triode V1, triode V2 forms comparison amplifier, produce square-wave signal, triode V4, triode V5, triode V6, triode V7, triode V8, capacitor C, current-limiting resistance R, frequency adjustment potentiometer RP1 forms integrating circuit, produce triangular signal, comparer and integrator join end to end, form closed loop circuit, consist of stable triangular wave oscillator, in forming feedback circuit, for on integrating capacitor C to discharge and recharge impact as far as possible little, in circuit, adopt field effect transistor V9 as source follower, to improve the input impedance of charge and discharge capacitance C end, reduce the impedance of triangular wave output terminal, the triangular wave output terminal is connected with the input end base stage of the comparison amplifying circuit that triode V2 forms.
3. frequency conversion simple alternating current characteristic demonstrating device as claimed in claim 2, it is characterized in that: described Sine wave shaping circuit comprises the triangular signal with source follower output, by regulating the RP2 potentiometer, make the positive peak of triangular wave and the negative peak of triangular wave end with the flex point of conducting regional at diode, after delivering to operational amplifier and doing further deburring shaping, export the input end that perfect sinusoidal waveform is delivered to power amplifier.
4. frequency conversion simple alternating current characteristic demonstrating device as claimed in claim 3, it is characterized in that: the TDA3001D1 that described sinusoidal power amplification circuit adopts TIX to produce, 20W monophonic audio power amplifier (9), sine wave signal by amplifier output is sent into power amplifier integrate circuit 2 pin in-phase input ends, the BTL output 10Vp_p voltage of power amplifier is for load circuit.
5. frequency conversion simple alternating current characteristic demonstrating device as claimed in claim 1, it is characterized in that: described power unit (1), indicating section (2) and demonstration part (3) are installed on the base (7), be provided with drawer (8) in the described base (7), the refill-unit of the detachable electron element (6) in the load circuit is placed in the drawer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220383816 CN202855149U (en) | 2012-08-03 | 2012-08-03 | Frequency conversion sine AC characteristic demonstration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220383816 CN202855149U (en) | 2012-08-03 | 2012-08-03 | Frequency conversion sine AC characteristic demonstration device |
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| CN 201220383816 Expired - Fee Related CN202855149U (en) | 2012-08-03 | 2012-08-03 | Frequency conversion sine AC characteristic demonstration device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842257A (en) * | 2012-08-03 | 2012-12-26 | 湖州文思必得科教仪器有限公司 | Demonstrating device for frequency-conversion sine alternating current characteristics |
| CN103399189A (en) * | 2013-07-25 | 2013-11-20 | 西华师范大学 | Multifunctional alternating current circuit parameter test and feature demonstrating device |
| CN106816068A (en) * | 2015-11-29 | 2017-06-09 | 重庆尊来科技有限责任公司 | A kind of capacitive reactance tester of non-gate |
| CN113131756A (en) * | 2021-05-06 | 2021-07-16 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
-
2012
- 2012-08-03 CN CN 201220383816 patent/CN202855149U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842257A (en) * | 2012-08-03 | 2012-12-26 | 湖州文思必得科教仪器有限公司 | Demonstrating device for frequency-conversion sine alternating current characteristics |
| CN102842257B (en) * | 2012-08-03 | 2016-02-10 | 湖州文思必得科教仪器有限公司 | Frequency conversion simple alternating current characteristic demonstrating device |
| CN103399189A (en) * | 2013-07-25 | 2013-11-20 | 西华师范大学 | Multifunctional alternating current circuit parameter test and feature demonstrating device |
| CN103399189B (en) * | 2013-07-25 | 2016-03-02 | 西华师范大学 | A kind of Multifunction AC circuit parameter testing and characteristic demonstration device |
| CN106816068A (en) * | 2015-11-29 | 2017-06-09 | 重庆尊来科技有限责任公司 | A kind of capacitive reactance tester of non-gate |
| CN113131756A (en) * | 2021-05-06 | 2021-07-16 | 山东精久科技有限公司 | Program-controlled variable frequency power supply with parallel function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20130803 |