Demonstrating device for frequency-conversion sine alternating current characteristics

A technology of sinusoidal communication and demonstrator, applied in the field of teaching aids

Active Publication Date: 2012-12-26
重庆乐教科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After all, as a popular teaching aid, the cost is also an issue that needs to be considered

Method used

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  • Demonstrating device for frequency-conversion sine alternating current characteristics
  • Demonstrating device for frequency-conversion sine alternating current characteristics
  • Demonstrating device for frequency-conversion sine alternating current characteristics

Examples

Experimental program
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Embodiment Construction

[0016] Such as figure 1 , figure 2 as well as image 3 As shown in the frequency conversion sine AC characteristic demonstrator, the power supply part 1, the indicating part 2 and the demonstration part 3 are characterized in that: the power supply part 1 is composed of a triangular wave generator connected in sequence, a sine wave forming circuit, and a sine power amplifier circuit. The indicating part 2 includes a two-digit digital frequency meter, the frequency test signal comes from the square wave signal of the comparative amplifier, and also includes an external port 4, which is connected to an oscilloscope, and the demonstration part 3 includes parallel load circuits R, L, C Each branch is connected in series with one small light bulb 5 respectively. The triangular wave generator is all composed of split devices, and the triode V1 and the triode V2 form a comparative amplifier to generate a square wave signal. The frequency adjustment potentiometer RP1 forms an inte...

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PUM

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Abstract

The invention aims at making up for the defects in the prior art, and provides a demonstrating device for demonstrating a sine frequency-conversion alternating current circuit characteristics. The demonstrating device can visually demonstrate characteristics of alternating current and improve demonstrating accuracy. The demonstrating device comprises a power supply part, an indicating part and a demonstrating part. The power supply part comprises a triangle-wave generator, a sine wave formation circuit and a sine power amplifying circuit. The triangle-wave generator, the sine wave formation circuit and the sine power amplifying circuit are connected in sequence. The demonstrating part comprises a load circuit resistance, an inductance and capacity branches which are connected in parallel. A detachable electronic element is arranged in each branch and respectively connected with one small bulb in series. By means of a way of changing frequency of a frequency-conversion power circuit, the demonstrating device enables users to observe light and dark changing situations of bulbs connected with the resistance, the inductance and the capacity branches in series, and can detect perfect sine wave shape from a wave-demonstrating device, can visually demonstrate to students, and explain the characteristics of the sine wave alternating current.

Description

technical field [0001] The invention relates to a teaching aid, in particular to a demonstrator for demonstrating the characteristics of a sine wave frequency conversion AC circuit. Background technique [0002] In the classroom, to let students remember some knowledge points quickly, teachers will choose various teaching aids to assist teaching. For example, when learning the basics of electricity, the AC circuit characteristic demonstrator will be used. But nearly 20 years after the product was listed in the equipment catalog in the 1990s, the product has been very confusing. There are basically two types of such products: one is to show the phase difference of inductance and capacitance in the AC circuit, and the other is to show the inductive reactance and capacitive reactance in the AC circuit. The AC circuit characteristic demonstrator in the prior art produces a square-wave simulated AC through a DC through a commutator, which has the disadvantage that it is quite d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09B23/18
Inventor 唐丰唐智川
Owner 重庆乐教科技集团股份有限公司
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