DRL’s DC booster
A boost converter alias step-up converter is a DC-to-DC power converter that steps up voltage while stepping down current from its input supply to its output load.
Why DRL’s DC Booster?
This boost converter is a high efficiency step-up DC/DC switching converter. High efficiency.. What? How much??
Yeah its high efficiency converter because we can step the DC voltage upto 750 Volts from 12 Volt input.
How it works?
The converter uses a transistor switch, typically a MOSFET, to pulse width modulate the voltage into an inductor. Rectangular pulses of voltage into an inductor result in a triangular current waveform.
Let’s derive the equation for the current and voltage for a boost converter and show the tradeoffs between ripple current and inductance.
Having Duty cycle in mind, lets derive the equation for Duty cycle and Voltage out.
Duty cycle equation :
If we neglect the voltage drops across the transistor and diode then:
So it is clear that the output voltage is related directly to the duty cycle of the pulses.
Design of DRL’s boost converter :
The main question when designing a converter is what sort of inductor should be used. In most designs the input voltage, output voltage and load current are all dictated by the requirements of the design, whereas, the Inductance and ripple current are the only free parameters. We know that the inductance is inversely proportional to the ripple current. In other words, if you want to reduce the ripple, then use a larger inductor. Thus, in practice a ripple current is decided upon which will give a reasonable inductance.
This causes an instability, which is well known for boost converters, and not a problem with buck converters (Step down converter).
Solution
We combat this instability is to choose a large enough inductor so that the ripple current is greater than twice the minimum load current. When this condition is met then the inductor is always in continuous mode.
Then we can say that
For higher efficiency the diode should be an ultra fast recovery diode.
How can I use this?
This can be designed as a stand alone device which will be embed into a DC machine to boost up the voltage or for your old machine which needs higher voltage with a low supply. We can use it in Flash Stamping machines, UV pasting and so on.
For more information, details and enquiry don’t hesitate to contact us at dharmaresearchlab.com
