Non investing buck boost converter theory

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The working principle of this circuit is very simple. This IC is configured to switch at KHz switching frequency which is suitable for this type of application. Up next, we have the circuit which is responsible for the buck-boost operation. This is the reason why we have decided to modify the circuit. We have done this so that we can use an N-channel MOSFET to drive the circuit and the above-simplified circuit on the left-hand side shows exactly that.

The final part of the circuit is a differential amplifier. A differential amplifier takes in two voltage values, finds the difference between these two values, and amplifies it. The resulting voltage can be obtained from the output pin. In one of the previous projects, we have built a voltage subtractor circuit where we used a differential amplifier and explained all of its details, so do check that out if you want to learn the working principle of a differential amplifier. Finally, the resistors, R19 and R20 form a voltage divider that feeds back the voltage to pin 1 of the TL IC that regulates the PWM pulse depending upon the load condition.

As you can see on the bottom side of the board, I have used a thick ground plane to ensure sufficient current can flow through it. The power input is on the left side of the board and the output is on the right side of the board. The complete design file along with TL Boost converter schematics can be downloaded from the link below.

I made some mistakes while making this PCB, so I had to use some copper wires as jumpers to fix that. The first time period is a time period for controlling the buck-boost converter to operate in a first operation mode. The controller also includes a mode controller coupled to the first time generator and configured to generate a first control signal to control at least a first portion of the buck-boost converter at least partially according to the first signal indicating the first time period.

To provide for the substantially smooth transitions, the voltage converter operates in a quasi-constant on-time valley current mode during boost operation mode, quasi-constant off-time peak current mode during buck operation mode, and using a tri-phase switching control during buck to boost, or boost to buck, transitions.

The transitions are based, for example, at least in part on an amount of time that a given switch e. The voltage converter is implemented as a buck-boost converter configured to produce an output voltage that is substantially less than, equal to, or greater than an input voltage. In some embodiments, the voltage converter is implemented as an integrated circuit, e. In other embodiments, the voltage converter may be implemented as one or more separate components that may be coupled together.

The input voltage is received from a voltage source The voltage source is, in some embodiments, a battery which may have a variable voltage. For example, as the battery discharges, the input voltage supplied by the battery may decrease. Conversely, as the battery charges, the input voltage supplied by the battery may increase.

In some embodiments it may be desired that the output voltage remain substantially stable e. To produce the output voltage, the voltage converter steps-down the voltage received from the voltage source when the voltage received from the voltage source is greater than the output voltage and steps-up the voltage received from the voltage source when the voltage received from the voltage source is less than the output voltage. In this way, the voltage converter operates as a buck converter when the voltage received from the voltage source is greater than the output voltage and operates as a boost converter when the voltage received from the voltage source is less than the output voltage.

When the voltage received from the voltage source is about equal to the output voltage e. The period of time during which the voltage converter operates as the buck-boost converter alternating between buck operation mode and buck operation mode is referred to, in some embodiments, as tri-phase switching operation mode. The voltage converter comprises a buck-boost converter and a buck-boost controller The buck-boost converter is coupled to the voltage source and a bad and is configured to provide a substantially stable e.

The buck-boost controller is coupled to the voltage source and the buck-boost converter and is configured to control whether the buck-boost converter is performing in buck operation mode, boost operation mode, or tri-phase switching operation mode.

The buck-boost converter comprises p-type metal oxide semiconductor PMOS transistors and , n-type metal oxide semiconductor NMOS transistors and , inductor , and capacitor The PMOS transistor is coupled between the voltage source and a node and is controlled by the buck-boost controller The NMOS transistor is coupled between the node and a ground potential and is controlled by the buck-boost controller The inductor is coupled between the node and a node The NMOS transistor is coupled between the node and the ground potential and is controlled by the buck-boost controller The PMOS transistor is coupled between the node and a node and is controlled by the buck-boost controller The capacitor is coupled between the node and the ground potential The buck-boost controller comprises a sense resistor , drivers and , feedback resistors and , error amplifier , compensation resistor , compensation capacitor , current comparator , boost time generator , buck time generator , and mode controller The feedback resistors and are coupled together in series to form a voltage divider coupled between the nodes e.