Convertidor Cúk. L1 L2 C1. V1 uH 10u mH C2 R1 u. V3 D1 MUR TD = 0. V2 = PW = 45u. PER = 50u. V1 = 0. 0. Voltaje Inductor. A partir del modelo de tiempo continuo del convertidor, se obtiene el modelo . of a bidirectional coupled –inductor Cuk converter operating in sliding-mode. Cuk Converter. 0. Favorite. 4. Copy. Views. Open Circuit. Cuk Converter. Social Share. Circuit Description. Graph image for Cuk Converter. Circuit Graph.

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This page was last edited on 10 Novemberat This state of operation is usually not studied in much depth as it is generally not used beyond a demonstrating of why the minimum inductance is crucial, although it may occur when maintaining a standby voltage at a much lower current than the converter was designed for. Therefore the topologies are not readily convertible from one to the other. Commons category link is on Wikidata. Views Read Edit View history. This implies that the current through the inductors has to be the same at the beginning and the end of the commutation cycle.

Please Select a Region. Let’s look at the current ckk during switching cycles for each topology.

Charging a capacitor with a current source the inductor prevents resistive current limiting and its associated energy loss. Fuk the power transfer flows continuously via the capacitor, this type of switcher has minimized EMI radiation.

By using this site, you agree to the Terms of Use and Privacy Policy. The capacitor C is used to transfer energy and is connected alternately to the input and to the convertiddor of the converter via the commutation of the transistor and the diode see figures 2 and 3.

He joined Linear Technology now a part of ADI in as an associate engineer and was promoted to applications engineer in For the inverting converter, this clnvertidor is negative during the 2nd phase of the switch cycle.


In steady state, the energy stored in the inductors has to remain the same at the beginning and at the end of a commutation cycle.

This converidor is necessary because if the capacitor were connected directly to the voltage source, the current would be limited only by the parasitic resistance, resulting in high energy loss.

It also has higher peak current and output ripple than a Cuk converter with a similar output current. In other projects Wikimedia Commons. For the Cuk, the simplified duty cycle assuming lossless diodes and switches is given by:. The current flowing from the input power source is continuous in other words, current flows from the input when convertiddor power switch is closed or open.

Differences Between the Ćuk Converter and the Inverting Charge Pump Converter

Though it uses a charge pump, fairly high load currents can be obtained because the inductor is the main energy storage element rather than a flying capacitor.

The two inductors L 1 and L 2 are used to convert respectively the input voltage source V i and the output voltage source C o into current sources. An example of the single inductor inverting topology is shown in figure 9 below using the LTC inverting controller with external power switch.

To this circuitry cuo add diodes and capacitors to obtain the inverting charge pump converter. Though similar in appearance, the operation of the two circuits is quite different. The inverting charge pump is closely related to a step-up converter because it combines an inductor-based step-up regulator with an inverting charge pump.

This configuration often provides the best combination of size, efficiency and output ripple for a given output current. In addition to these circuits, the buck converter with the output referenced to ground, and the flyback converter are also capable of providing a negative output voltage. Continuous current flow combined with the LC filters results in a smoother input and output current, which in turn gives low output voltage ripple noise.


It is essentially a boost converter followed by a convetidor converter with a capacitor to couple the energy. It features a wide 4. Unfortunately, many data sheets and online search parametric tables do not distinguish between the unique topologies, but rather lump them together as “inverting converters.

Ćuk converter – Wikipedia

The lowside switch is also used in boost, SEPIC and flyback topologies, so these devices are quite versatile. Since the power switch must see a negative voltage, the inverting topology is less versatile in that it cuo only be used for negative voltages. The coupling or blocking capacitor receives energy from the input side of the circuit and transfers it to the output side of the circuit.

The inverting topology uses a single inductor and does not require a coupling capacitor; thus it requires fewer components as shown below. An AC transformer and an additional capacitor must be added.

The current in both inductors decreases when the switch opens. The LTC has a 3. Figure 7 below shows the LTused as an inverting charge pump upper circuit and a boost converter. Convedtidor difference between the topologies is the voltage at cojvertidor switch node. He has been in the semiconductor industry for 26 years in convertudor, business management and marketing roles. The objective is to show the advantages and trade-offs for the Cuk and inverting charge pump, followed by a brief discussion of the inverting topology, so you can make a more informed choice when selecting a negative output circuit topology that best suits your application.

The LT is a multitpology switching regulator with a 3.