Ripple voltage calculation

Ripple voltage calculation

Sub-GHz, 915 MHz module for IoT networks. Search for Microchip products by groups ripple voltage calculation parametric values.

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Slow, Mixed and Fast Decay Modes. Why Do We Need To Complicate Things? If you are driving inductive loads, whereas it is a brushed or brushless DC motor, stepper motor, solenoid or a relay, you must have experienced a little bit of a problem in the form of an unwanted current flowing in the unwanted direction. If you did not take this fact of the laws of physics into account, chances are you  have had the only once enjoyable experiencing of smoking your transistor. Lets take a quick look at what is happening with our inductor. It is a known law of physics that inductors will not tolerate abrupt changes in current either when they are being charged or when they discharge. This is in essence because as you apply a voltage and a current starts to flow through the conducting element, a magnetic field is generated.

The magnetic field at the same time generates a current that fights the incoming current, making the incoming current needing to fight its way into the inductor. Case A of our picture shows a current happily flowing into our inductor. I say happily because in essence nothing stops this flow. As soon as the FET is energized, the current starts to flow until the inductor saturates. But what happens when the FET is disabled?

We need to provide a way for this current to find a safe path which not encompasses the destruction of our transistor switch. And the solution often comes in the form of what is called a free wheeling diode. It is only when the FET is OFF, that the inductor operating as a source makes the voltage across the diode positive, hence making it conduct. But why do we need to bother about this when dealing with H Bridges? The previous example shows a simple single FET driver. Are H Bridges subjected to the same problems? In essence the problem still exist because inductive loads will still try to conduct through a disabled FET when said switch gets disabled.

So an H Bridge would suffer the same fate as the single transistor driver if an alternate path is not provided. On an H Bridge you only enable as much as two FETs at any given time. If the inductive load was say a DC motor, then the motor would spin in one direction, say clockwise. Unfortunatelly, all is good only if we never disable those FET’s. Because as soon as you do, then the current will try to keep on flowing on the same direction, which should result in flames right? What if we add freewheeling diodes to save the day? Four of them should do, right?