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MPFC-115-270-QP Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters |
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MPFC-115-270-QP Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters |
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11 / 16 page  MPFC-115-270-QP Input:85-180Vrms Output:270Vdc Power:350W Product # MPFC-115-270-QP Phone 1-888-567-9596 www.synqor.com Doc.# 005-0006727 Rev. B 03/31/2016 Page 11 Output Current Limit and Short-Circuit Shutdown: If the MPFCQor’s output is overloaded such that its output current limit becomes activated, the output voltage will fall as the excess load current discharges the hold-up capacitor. The MPFCQor will continue to deliver power into this overload condition for 100 ms, after which the unit will shut down and automatically return to the beginning of the startup sequence described above. If at any point the output voltage falls below the peak of the AC source voltage, the MPFCQor will immediately shut down and return to the startup sequence. Over Temperature: If the internal temperature of the MPFCQor reaches 130°C, the MPFCQor will turn off its boost converter. The LOAD_ENABLE output will simultaneously be de- asserted high. When the internal temperature falls below 110°C, the MPFCQor will return to the beginning of the startup sequence described above. Energy Storage Hold-Up Capacitor The hold-up capacitor performs two functions: • It handles the cyclic imbalance between the flow of energy drawn from the AC source and the flow of energy delivered to the DC-DC converters. In doing so, the voltage across the hold-up capacitor has a ripple at a frequency twice that of the AC source voltage (e.g. 120Hz for a 60Hz input). The larger the hold-up capacitor, or the higher the frequency of the AC source, the smaller this ripple will be. • It provides a source of energy so that the DC-DC converters can continue to deliver load power during a temporary brownout or dropout of the AC source. The larger the hold-up capacitor the longer it can provide this energy. Often it will be made large enough to allow the load to be gracefully shutdown after the AC source has been outside of its normal range for a set amount of time. A typical “hold-up time” would be in the 20 ms range for a 50/60 Hz system. The total energy stored in a hold-up capacitor having capacitance C at any given voltage V is: E = ½CV2 The amount of energy, ∆E, which can be drawn from this capacitor depends on the capacitor’s starting voltage, Vs, and its final voltage, Vf, where Vs is the MPFCQor’s nominal regulated output voltage and Vf is the MPFCQor’s minimum output voltage limit. This energy equals the amount of power, P, which the DC-DC converters draw from the hold-up capacitor times the length of time, ∆t, which it takes for the hold-up capacitor’s voltage to drop from Vs to Vf. This energy can be equated to the hold-up capacitance according to the following formula: ∆E = P∆t = ½C(Vs2 - Vf2) This formula can be rearranged to find the minimum required value for C to provide the hold-up time desired for a given power level (note: this power level P is not the load power, but rather the load power divided by efficiency of the DC-DC converters): Cmin = 2P∆t ⁄ ( Vs2 - Vf2) For example, if we assume P = 350W, ∆t = 20ms, Vs = 270V and Vf = 150V, then we would want a hold-up capacitance of at least 280µF. NOTE: The MPFCQor is able to operate with a minimum of 100µF of hold-up capacitance, but SynQor recommends at least 660µF if the power system will be required to conform to lightning surge standards. This is because the MPFCQor relies on the hold-up capacitor to absorb most of the energy from a lightning surge. NOTE: Even though the MPFCQor limits the inrush current drawn from the AC source during its startup sequence, it will not necessarily limit this current at the end of a temporary brownout or dropout of the AC source when the hold-up capacitor’s voltage has not dropped below its minimum output voltage limit. In such a condition the MPFCQor will not reinitiate a startup sequence and it will therefore not limit the current flowing through it. If the peak of the AC source voltage is greater than the hold-up capacitor’s voltage at the end of the brownout/dropout period, there will be a large inrush current for one half-cycle as the hold-up capacitor’s voltage is charged up to the peak of the AC source voltage. The larger the hold-up capacitor, the larger this inrush current will be. To limit inrush current during this event, limit the charging current of additional hold-up capacitance with a resistor and diode as shown below. If it is desired to have a hold-up time longer than can be achieved with the maximum specified hold-up capacitance, then the circuit shown below can be used. Application Section |
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