| 摘要 |
A consumed power measuring device is provided to display the power consumption rate proximate to the real power consumption rate of products by measuring consumed power of the secondary side of a transformer in real time and then adding up the measured consumed power of the secondary side and a consumed power value of a primary side. A consumed power measuring device is composed of a rectifying unit(300) rectifying and smoothing input AC(Alternating Current) voltage; a transformer(303) receiving voltage of the rectifying unit and generating the predetermined number of voltages to a secondary side according to the current control of a winding of a primary side; a switching unit(301) switching on/off the output voltage of the primary side according to a PWM(Pulse Width Modulation) control signal generated by feedback voltage and a synchronization signal; a voltage regulating unit(304) regulating the voltage of the primary side of the transformer to calculate turn-on time of the switching unit; a consumed power information storing unit(310) storing consumed power values of the switching unit and the rectifying unit connected to the primary side of the transformer; a control unit(305) calculating the turn-on time of the switching unit with the output of the voltage regulating unit, measuring the consumed power according to the calculated turn-on time, input voltage, switching frequency of the switching unit, and inductance of the transformer, and then adding up the measured consumed power value and the consumed power value of the primary side pre-stored in the consumed power information storing unit; and a display unit(306) displaying the consumed power value added in the control unit. |
