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ZETA DC DC converter design


SEPIC DC / DC converter topologies constructed with similar the ZETA converter topologies by a change in the output voltage level category input voltage to provide a positive output voltage. ZETA converter also need two inductors and a series capacitor (sometimes known as the flying capacitor). The SEPIC converter applications a scale boost converter configuration, the ZETA converter is different, it is configured by a driver of the high-end PMOS FET buck converter. ZETA converter is unstable another way of regulating the input power source, it's like a low-cost wall power. Let's apply a coupled inductor to minimize board space. This article is the first volume of how to design a run ZETA converter with coupled inductor in continuous conduction mode (CCM).

foundation works

Figure 1 shows a schematic circuit diagram of the ZETA converter comprising an input capacitor CIN and an output capacitor COUT, coupled inductor L1a (L1b), an AC coupling capacitor CC, a power of the PMOS FET i.e. Q1, and a diode D1 . Figure 2 shows the Q1 is the open position and Q1 closed state, in the CCM run converter.


Figure 1 ZETA converter circuit diagram



If you want to know the voltage of the circuit nodes in the two switches is off status and switch operation to analyze circuit DC premise is very major. Capacitor CC in parallel with COUT, thus during steady state CCM CC is charged up to the output voltage VOUT. Figure 2 shows the voltage of the CCM during operation L1a with L1b.

Figure the of 2 CCM run during ZETA converter



Q1 closed,power inverter, the L1b the voltage necessary to VOUT,www.12vgridtiepowerinverters.com, due to its parallel with COUT. Because COUT is charged to VOUT, VIN + VOUT therefore Q1 is closed, the voltage of Q1; so L1a of the voltage will be relatively Q1 drain-VOUT,Grid tie inverter. Q1 is turned on, the charging to the the VOUT capacitor CC L1b series; thus the L1b voltage + VIN, and the voltage of the diode D1 is compared to VIN + VOUT.


Figure 3 shows the current through the various circuit components. Q1 is turned on, the input power of the energy is stored in the L1a, L1b, with the CC. The L1b also supply IOUT. Q1 is turned off, the CC continuous for L1a supply current, And the L1b again IOUT.

Figure 3 CCM during ZETA converter component current



duty cycle

assume 100% potency of a duty cycle D, for CCM running Zeta converter, which is



it can be rewritten as



Dmax emerged in the VIN (min), while the Dmin presented in the VIN (max).

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