| 摘要 |
PURPOSE:To enable the accurate integration of largely varied electric energy by accurately integrating instantaneous power, by processing the instantaneous power outputted from a multiplier by an integrator circuit reset at every constant cycle. CONSTITUTION:Switches 11, 91 are controlled by a control circuit 70 responding to a start signal ST and a stop signal SP to control the integration of instantaneous power outputted from a multiplier 10 by an integrator 80, the resetting of said integrator 80 at every constant cycle, the supply of the integrated value to a sample hold circuit 90 and the take-in of the integrated value to an A/D converter 30 and an operator circuit 100. Therefore, instantaneous power from the start of integration to the finish thereof and power can be accurately integrated even when the variation in power is large or an integration time is short as compared with a case using a low pass filter. |
