Electrical isolation device and method for accurately converting alternating-current and direct-current voltages
An AC and DC voltage, electrical isolation technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of complicated circuits on the left side of the isolation conversion, large data transmission, and high production costs, and achieve the advantages of miniaturized design, high The effect of transforming precision and reducing the amount of data
Active Publication Date: 2020-09-04
长沙天恒测控技术有限公司
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[0004] The present invention provides an electrical isolation device and method for accurately transforming AC and DC voltages, so as to solve the technical problems of large volume and heavy weight, which are not conducive to miniaturization and low transforming precision in the current voltage transformer transforming method , and solve the technical problems of the current simple digital isolation transmission method, such as the circuit on the left side of the isolation transformation is too complicated, the production cost is high, and the data transmission volume is large
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[0047] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.
[0048] Such as image 3 As shown, the preferred embodiment of the present invention provides an electrical isolation device for accurately converting AC and DC voltages, including a step-down conversion circuit 11, a voltage-frequency conversion circuit 12, an optical isolation conversion circuit 13, a frequency-voltage demodulation circuit 14, Filtering circuit 15, signal sampling circuit 16 and data processing module 17, described voltage-to-frequency conversion circuit 12 is connected with step-down conversion circuit 11, optical isolation conversion circuit 13 respectively, and described frequency-voltage demodulation circuit 14 is connected with optical isolation conversion circuit respectively 13. The filter circuit 15 is connected, and the signal sampling c...
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The invention discloses an electrical isolation device and method for accurately converting alternating-current and direct-current voltages. According to the electrical isolation device, firstly, a voltage reduction conversion circuit is used for carrying out voltage reduction conversion on a voltage signal; the voltage signal is converted into a frequency pulse signal through a voltage-frequencyconversion circuit; the circuit design in the left side of isolated transmission is simplified; a large number of precise simulation elements are not needed; the circuit cost is reduced, then an optical isolation conversion circuit is used for carrying out optical isolation transmission; the frequency pulse signal is converted into a voltage signal through a frequency-voltage demodulation circuitwhich is symmetrically designed with the voltage-frequency conversion circuit; and the voltage signal is filtered by a filtering circuit to remove high frequency interference. Thus, the voltage signalis converted into the original voltage signal after step-down conversion, accurate linear reduction of the voltage signal is realized, and finally, the signal is sampled by a signal sampling circuitand then is output to a data processing module for subsequent processing.
Description
technical field [0001] The present invention relates to the technical field of voltage isolation transformation, in particular to an electrical isolation device for accurately converting AC and DC voltages, and also relates to an electrical isolation method for accurately converting AC and DC voltages. Background technique [0002] At present, the voltage transformer transformation method commonly used for electrical isolation transformation of AC voltage, such as figure 1 As shown, the advantage is that the circuit is simple, and the specially designed isolation transformer can realize electrical isolation with a higher insulation level on the primary and secondary sides. But it also has some disadvantages, such as: 1) large volume and weight, which is not conducive to miniaturization; 2), can not handle DC voltage; 3), poor accuracy, especially when small signal input, by the transformer winding, etc. The introduced noise will lead to worse accuracy; 4), the output source...
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CPCH02M1/10H02M1/0006
Inventor 周新华姚兴茂叶韶华
Owner 长沙天恒测控技术有限公司