Electric power microcomputer protection circuit
A microcomputer protection circuit and electric power technology, which is applied in the direction of electric power measurement through current/voltage, measurement using digital measurement technology, etc., can solve the problems of inaccurate power and electric degree measurement of protection devices, etc., to reduce application costs and facilitate use. , the effect of reducing costs
Inactive Publication Date: 2016-09-21
TIANJIN PERIT ELECTRIC POWER TECH
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Problems solved by technology
[0003] In view of this, the present invention aims to propose a power microcomputer protection circuit with accurate measurement and convenient use, so as to solve the problem of inaccurate measurement of power and electric degree in the original protection device
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[0012] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0013] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0014] Such as figure 1 As shown, a power microcomputer protection circuit includes a three-phase three-wire system input terminal, a voltage transformer, a current transformer and a metering chip, and the three-phase three-wire system input terminal is connected to the voltage of the metering chip after passing through the voltage transformer Input terminal, the A phase and C phase of the three-phase three-wire system input terminal are connected to the current input terminal of the metering chip through the current transformer and the transformer in turn, and the metering chip is connected to the DSP through the SPI interface, and the SPI bus is used for data exchange. , the DSP is co...
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The present invention provides an electric power microcomputer protection circuit. The circuit comprises an input end, a metering chip, a current transformer and a voltage transformer. The input end accesses the voltage input end of the metering chip after passing through the voltage transformer, the A and the C of the input end access the current input end of the metering chip in order after passing through the current transformer and the transformer, and the metering chip is connected with a DSP which is connected with a FRAM. The metering chip is connected with the DSP through an SPI interface to perform data exchanging by employing an SPI bus. The model of the metering chip is RN8302B, and the model of the DSP is TMS320F28335. The electric power microcomputer protection circuit employs a professional metering chip to perform power measurement and electric energy metering to accurately measure the line power and perform reliable metering of the electrical degrees; electric power microcomputer protection circuit does not need to add a multifunctional electric power instrument so as to reduce application cost, and is simple and reasonable in circuit design and rapid and convenient for usage.
Description
technical field [0001] The invention belongs to the application field of power protection, in particular to a power microcomputer protection circuit. Background technique [0002] At present, most of the existing microcomputer protection devices use DSP or MCU as the main processor, use AD to sample data, and then calculate the measured value through the algorithm. The sampling rate generally adopts a sampling rate below 32 points, and in order to ensure the reliability of the protection function and real-time, the algorithm is generally relatively simple, and the accuracy of the calculated power is very low. At the same time, due to the sampling period and algorithm, the measurement of current and voltage values is relatively accurate, but the accuracy of power and electricity metering is very low, and the error is large. There is a technical problem of inaccurate measurement, so in practical applications, a multifunctional power meter needs to be installed in each unit i...
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IPC IPC(8): G01R21/06G01R19/25
CPCG01R21/06G01R19/25
Inventor 杨立军
Owner TIANJIN PERIT ELECTRIC POWER TECH