Power utilization quality detection circuit and detection method thereof
A detection circuit and detection method technology, applied in the direction of measuring electrical variables, phase angle between voltage and current, measuring devices, etc., can solve problems such as high cost, complex calculation, phase difference, etc., and achieve easy implementation and high calculation accuracy. , the effect of simple circuit structure
Inactive Publication Date: 2010-05-19
SHANGHAI BEILING
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[0004] However, in the prior art, the frequency measurement circuit for the voltage input signal and the calculation circuit for the phase angle between the voltage input signal and the current input signal in the electric energy metering chip are separated, and the existing calculation voltage input signal and current input The method of the phase angle of the signal is mainly to perform FFT (Fast Fourier Transform) operation on the two signals, and then obtain the respective phases, and perform subtraction to obtain the phase difference; although the above method has high calculation accuracy, the operation is complicated , requires a special circuit to perform FFT operation, hardware implementation is difficult and costly
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[0025] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0026] Such as figure 2 As shown, a power quality detection circuit of one of the present invention includes a first comparator 11, a second comparator 12, a first AND gate 2, a first counter 31, a second counter 32 and a phase detection module 4 ,in,
[0027] The negative input terminal and the positive input terminal of the first comparator 11 respectively receive the external voltage input signal V_VOL and the zero-crossing signal. Since the voltage input signal V_VOL is a 24-bit signed digital signal, only the highest value of the voltage input signal V_VOL is required. The sign bit v_sign can be compared with 0, and a voltage polarity flag signal v_flag is output after the comparison. On the one hand, the output terminal is connected to the first counter 31 and the phase detection module 4 respectively, and on the other hand...
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The invention relates to a power utilization quality detection circuit and a detection method thereof. The detection circuit comprises a first comparator, a second comparator, a first AND gate, a first counter, a second counter and a phase detection module; the negative input end and the positive input end of the first comparator respectively receive external voltage input signals and zero-crossing signals; the output end of the first comparator is connected with the first counter and the phase detection module and is connected with the second counter through the first AND gate; the negative input end and the positive input end of the second comparator respectively receive external current input signals and zero-crossing signals; and the output end of the second comparator is connected with the phase detection module and is connected with the second counter through the first AND gate. The power utilization quality detection circuit simultaneously realizes the calculation of a phase angle between the voltages input signals and the current input signals and the measurement of the frequency of the voltage input signals, and also has the advantages of simple circuit structure, high calculation accuracy, easy implementation and the like.
Description
technical field [0001] The invention relates to a power quality detection circuit and a detection method for an electric energy metering chip. Background technique [0002] Nowadays, in order to analyze the quality of electricity consumption, it is usually necessary to calculate the phase difference between the voltage input signal and the current input signal in the electric energy meter, that is, the phase angle, which is used to calculate the power factor; at the same time, it is also necessary to measure the frequency of the voltage input signal, using for signal analysis. [0003] The schematic diagram to realize the above phase angle calculation and frequency measurement is as follows: figure 1 As shown, after the input analog current signal VP / IP and analog voltage signal VN / IN are filtered by the programmable gain amplifier (PGA), analog-to-digital converter ADC sampling, filter SINC4 and high-pass filter HPF, the output current I_CUR and The voltage V_VOL is a 24-...
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Login to View More IPC IPC(8): G01R25/00G01R23/02
Inventor 赵海燕
Owner SHANGHAI BEILING