Phase correction circuit and method and electric energy metering device

Abstract

The invention discloses a phase correction circuit and method and an electric energy metering device. The phase correction circuit comprises a reference voltage circuit and a current correction circuit. The reference voltage circuit comprises a first preset number of first delay D triggers and first synchronous D triggers; the voltage signal passes through each first delay D trigger and then is output to the first synchronous D trigger; the current correction circuit comprises a second preset number of second delay D triggers, a second synchronous D trigger and a data selector; the second delay D triggers are connected in series, the output ends of the second delay D triggers are connected with the input end of the data selector, and the data selector is used for selectively outputting onepath of current signals output by the second delay D trigger to the second synchronous D trigger according to the selection control signal; the second preset number is larger than or equal to the first preset number, and when the two preset numbers are equal, the two preset numbers are larger than 1. The phase correction circuit can realize compatibility of high phase correction precision and a 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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