The first round took place on March 11-12, during Global Time Attack’s Super Lap Battle at the Circuit of the Americas. This trying loop is known as hiccup operating mode and this feedback mechanism in which the output voltage is carried back to the driver to continue the operations is known as flyback topology.The inaugural NATA Championship presented by Grassroots Motorsports has begun. In faulty conditions the TNY268PN and feedback loop tries again till the conditions are normal. In normal conditions it will keep working and counters the overvoltage problems. TNY268PN turns on the switching cycle and checks the enabling pin. Our target output is 5 volts so whenever the output voltage gets to 5 volts the regulator attains 2.5 volts across its pin and controls the optocoupler which controls the VIPER22A driver circuit or TNY268PN. The shunt regulator has a reference potential of 2.5 volts. TL431 shunt regulator and R6, R7 that works like a resistor divider detects the output voltage. The feedback circuit is electrically isolated from the VIPER22A driver circuit due to the optocoupler PC817 (U2) because of optical communication instead of electrically. In the end, ripple removal from the DC voltage is done again using C6 and post LC filter (L2 & 7). We are designing a power supply with 2A output current. The component D6 in the schematic is the SB360 Schottky diode with 3A 60V ratings. It is kept filtering and reduce the EMI interference caused by induction in the circuit. Primary, Secondary and Auxiliary C1 is a Y-class 2kV capacitor. So we are using a ferromagnetic transformer with three windings i.e. It is important to isolate the circuit magnetically to avoid stray currents. So to prevent that we have opted for P6KE200A and UF4007 and it clamps the output to 200V. The transformer serves as an inductor for the SMPS driver and produces voltage spikes in switching off cycle due to leakage inductance. Diodes D1 TVS diode works as a clamper & D2 ultra-fast recovery diode works as a blocking diode. The clamping circuit is responsible for clamping the voltage spikes which occur due the switching of transformer. The output is then passed through the capacitor to smoothen the DC output ripple. A diode i.e D3 changes the analog output to the DC output followed by the 10 ohms resistor to resist the inrush current. The IC is embedded with high-power MOSFET that performs switching across the transformer. The integrated circuit is connected to the transformer winding to get the input bias. The resultant digital signal is then filtered and DC level is smoothened using a 400V capacitor with 22uF capacitance. The Analog input voltage is digitized through a 1A, 1000V DB107 full wave rectifier. A 250 VAC X-type line capacitor is connected to avoid unwanted line voltage noise generated in the circuit. In this situation, MOV becomes short to the fuse and the maximum inrush current flows through the slow blow fuse.įollowing fault protection is the input line filter capacitor. Whenever the input voltage shoots up more than the limit often called as voltage surge causes extreme current flow. As you can see through the schematic, F1 in series is a 1A, 250VAC slow blow fuse and MOV is a 275V, 7mm MOV. The fault protection circuit consists of a fuse and a Metal Oxide Varistor(MOV). Input surge and fault protection circuit.These are as follows and will be discussed in detail in the next section: The VIPER22A SMPS Power supply consists of different parts and sections. Image Credit: link VIPER22A Circuit Components The schematic of the SMPS prototype is displayed for the show. The prototype is built in Power Supply design software provided by its own manufacturers. The circuit takes in 220-240 volts input power to give out 12V,1A of output at full load. This section is an example guide of SMPS Power supply circuit using VIPER22A SMPS Controller IC. VIPER22A SMPS Example Circuit SMPS Power Supply
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