The converter topology used in this paper was a non-isolated bidirectional DC-DC buck-boost converter. This converter worked in two ways, which the charging.

The basic schematic of an inverting buck–boost converter. The buck–boost converter is a type of that has an output voltage magnitude that is either greater than or less than the input voltage magnitude. It is equivalent to a using a single inductor instead of a transformer. Two different topologies are called buck–boost converter. Both of them can produce a range of output voltages, ranging from much larger (in absolute magnitude) than the input voltage, down to almost zero. The inverting topology The output voltage is of the opposite than the input.

This is a with a similar circuit topology to the and the. The output voltage is adjustable based on the of the switching transistor. One possible drawback of this converter is that the switch does not have a terminal at ground; this complicates the driving circuitry. However, this drawback is of no consequence if the power supply is isolated from the load circuit (if, for example, the supply is a battery) because the supply and diode polarity can simply be reversed.

When they can be reversed, the switch can be on either the ground side or the supply side. A combined with a The output voltage is typically of the same polarity of the input, and can be lower or higher than the input. Such a non-inverting buck-boost converter may use a single inductor which is used for both the buck inductor mode and the boost inductor mode, using switches instead of diodes. Sometimes called a 'four-switch buck-boost converter', it may use multiple inductors but only a single switch as in the and topologies.

Are all buckboost converters bi-directional? A non-synchronous switching converter uses a diode for one of the switches.

Such a converter typically transfers power in only one direction. (Is there a better term for this than 'non-synchronous switching converter'?) A replaces each of those diodes with an actively controlled FET. Primavera 6 product code keygen software download. Such converters are inherently bi-directional and usually more efficient than non-synchronous converters. Do i still need transistors for the switches?

Or will the chip do the switching for me. If you only need 1 amp or so of input or output current, there are several switching regulator ICs available that have internal transistors that do all the switching for you. For example, you might look at the figure 13, which shows how to use that chip to produce 12 V regulated output from input anywhere in the range 8 to 16 V. (Alas, it is non-synchronous, transferring energy only in one direction). If you need higher currents, you're pretty much forced to use external discrete FET transistors for the switches. The typical circuit is shown on the first page of the, which shows a synchronous (and therefore bidirectional) 10 amp switching converter.

Recommend good topologies Some tips have been collected at. Simple uni-directional Buck-Boost without resonant caps using 'Supercaps'. Bi-directional Buck-Boost using resonant caps on each switch. (More efficient but more complex dead-time commutation control) Imagine a regenerative braking car in this arrangement with the battery voltage on the one side and motor/generator on the other side, and the demand to accelerate and brake the motor in an intelligent phase control controller (Not shown for simplicity). (There may be many parallel MOSFETS to reduce the Ron value).or a dual source power supply which can be charger on left and battery on right. These are some of the patented and licensed waveforms used to regulate the resonant switching commutation of the Buck-Boost high efficiency regulators.

You can read the patent for theory of operation. This is just intended to wet your appetite of the complexity of a bi-directional Buck Boost controller switch.

Voltage and current sensing is an important aspect to optimize commutation duration when the switch voltage drop is minimal. Resonant switch Capacitors & Diodes during free-wheeling play an important part in the commutation to make it loss free. These charts show the On state of each transistor with the thick bar, not the voltage or current. Each phase is carefuly controlled according to state of V1-V2 and power demand.