A phase correction circuit, method and electric energy metering device

Abstract

The application discloses a phase correction circuit, method and electric energy metering device, including a reference voltage circuit and a current correction circuit; the reference voltage circuit includes a first preset number of first delay D flip-flops and first synchronous D flip-flops ; The voltage signal is output to the first synchronous D flip-flop after each first delay D flip-flop; the current correction circuit includes a second preset number of second delay D flip-flops, second synchronous D flip-flops and data selection Each second delay D flip-flop is connected in series, and the output end of each second delay D flip-flop is connected to the input end of the data selector. The current signal output by the D flip-flop is output to the second synchronous D flip-flop; wherein, the second preset number is greater than or equal to the first preset number, and when both are equal, both are greater than 1. The phase correction circuit can realize the compatibility of high phase correction accuracy and wide phase correction range.

Description

technical field [0001] The present application relates to the technical field of electric energy metering, in particular to a phase correction circuit; and also relates to an electric energy metering device and a phase correction method. Background technique [0002] In the energy metering chip, due to the inconsistency of the off-chip sensor, a phase difference will be introduced between the voltage signal and the current signal. In view of the above situation, the current phase correction schemes include the following two types: Scheme 1, such as figure 1 As shown, a D flip-flop (DFF) is added before the analog-to-digital converter (ADC) and the cascaded integration-comb filter. The correction range of this phase correction method can be expanded arbitrarily, but the phase correction accuracy is determined by the analog-to-digital converter. The sampling frequency is determined. Since the sampling frequency of the analog-to-digital converter is low, the accuracy of phase ...

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Problems solved by technology

However, its phase correction range is related to the downsampling rate of the cascaded integral-comb filter. When the downsampling rate of the cascaded integral-comb filter is low, the phase correction range of the phase correction scheme is narrow and cannot Meet the need for a wide phase correction range

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