FPGA-based electric energy meter calibrating device signal source phase modulation method
An electric energy meter verification and signal source technology, applied in the field of signal sources, can solve problems such as affecting the efficiency of the inspection meter, damage to the post-stage power amplifier, waste of time, etc., so as to ensure normal output, save the time for switching between operating conditions, and improve the phase shift precision. degree of effect
Inactive Publication Date: 2021-01-15
QINGDAO TOPSCOMM COMM
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Problems solved by technology
[0003] The existing electric energy meter verification device often switches between the switching of the working conditions by turning off the source and setting the parameters and then restarting the switch. This method is faced with a huge number of instruments under test and switching between various working conditions, which is a great waste of time. time, which affects the efficiency of meter inspection
Or the energy meter verification device directly switches the working conditions, which may cause damage to the power amplifier of the rear stage, and further affect the efficiency of meter inspection.
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[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to illustrate the present invention, but not to limit the present invention.
[0025] like figure 1 As shown, an FPGA-based method for phase modulation of a signal source of an electric energy meter verification device includes the following steps:
[0026] Step 1: The frequency of the FPGA program is 36MHz, the sinusoidal waveform is generated by digital synthesis, and the sinusoidal function value of one cycle is divided into 3600 points and stored in the ROM.
[0027] Wherein in step 1, the phase shift fineness for the general method is 360° / 3600=0.1°;
[0028] Step 2: Determine whether the host computer has issued a phase modulation command. If p...
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The invention discloses an FPGA-based electric energy meter calibrating device signal source phase modulation method, which completes phase modulation by adjusting the counting value of a counter, enables the output waveform of an electric energy meter calibrating device to rapidly complete phase modulation without switching off the source, saves the working condition switching time, and improvesthe calibrating efficiency. The waveform is smooth in the phase modulation process, the situation of phase jump is avoided, and the normal output of the post-stage power amplifier is ensured; and meanwhile, the phase shift fineness is improved on the premise of not increasing the number of sinusoidal waveforms, and ROM resource consumption is greatly reduced.
Description
technical field [0001] The invention specifically relates to the technical field of signal sources, in particular to a signal source phase modulation method of an FPGA-based electric energy meter verification device. Background technique [0002] As the standard equipment for electricity bill settlement, the electric energy meter is a measuring instrument that is subject to compulsory inspection by the state. Every year, more than 10 million electric meters need to be calibrated. Facing the huge number of inspected meters, higher requirements are put forward for the calibration work. According to the verification regulations of the electric power industry, each instrument under test needs to be measured and verified under different working conditions required by the verification regulations, and the electric energy meter verification device is required to output the working conditions required by the verification regulations. [0003] In the existing electric energy meter v...
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IPC IPC(8): G01R35/04H03L7/24
CPCG01R35/04H03L7/24
Inventor 范建华付刚朱建国叶恒
Owner QINGDAO TOPSCOMM COMM