| 摘要 |
PURPOSE: A consumption power display is provided to measure a consumption power of a device and display the measured consumption power in real time. CONSTITUTION: A consumption power measuring device includes a rectifier(100), a transformer(103), a switch(101), a voltage controller(104), and a controller(105). The rectifier rectifies and smoothes an input AC voltage. The transformer receives the AC voltage and generates a predetermined number of voltages. The switch switches an output voltage of the primary side of the transformer according to a PWM control signal generated depending on a feedback voltage and a synchronous signal. The voltage controller controls the voltage of the primary side of the transformer in order to calculate a turn-on time of the switch. The controller calculates the turn-on time of the switch with the output of the voltage controller and measures a consumption power using the turn-on time, the input AC voltage, a switching frequency of the switch, and an inductance of the transformer.
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