ABB KVC758A124 3BHE021951R1024 transformer input surge and fault protection
Brand ABB Color Standard Application Industrial height 205mm rated current 360mA
Protection Level IP45 Suitable for motor power 236KW Application Site Power Industry BOM Number GJR2391500R1220 Power industry HIEE401782R0001 Part Number KVC758A124 3BHE021951R1024
Applicable pipe 2 Whether imported is weighing 5.88 kg can be sold nationwide
ABB KVC758A124 3BHE021951R1024 transformer input surge and fault protection
ABB KVC758A124 3BHE021951R1024 transformer input surge and fault protection
Before building a prototype device directly, let’s discuss how the circuit works. The circuit has the following parts –
Input surge and SMPS fault protection Input filter AC-DC conversion drive circuit or switching circuit clamp circuit. Magnetic and current isolation. EMI filter secondary rectifier filter section feedback part. Input surge and SMPS fault protection.
The segment consists of two parts, F1 and RV1. The F1 is 1A 250VAC slow Blow Fusion RV1 is 7 mm 275 volt MOV(metal oxide rheostat). During high voltage surges (over 275VAC), the MOV becomes completely short circuited and blows the input fuse. However, due to the slow-burning characteristics, the fuse can withstand the inrush current through the SMPS.
The input filter capacitor C3 is a 250VAC line filter capacitor. This is a type X capacitor, similar to the capacitor transformerless power supply circuit design we use in the design. Ac-dc conversion. The AC DC conversion uses DB107 to complete the full bridge rectifier diode. This is a 1000 volt 1A rated rectifier diode. Filter using 22uF 400V capacitor. However, in this prototype, we used a very large capacitance value. Due to the availability of capacitors, we use 82uF capacitors instead of 22uF. Such high-value capacitors are not required for the operation of the circuit. 22uF 400V is sufficient to achieve a rated output power of 12W. Drive circuit or switch circuit.
The VIPer22A requires bias windings to power Transformers. Once the bias voltage is obtained, VIPer starts switching the transformer, using the built-in high-voltage MOSFETs. The D3 is used to convert the AC biased output to DC, and the 10 ohm R1 is used to control the inrush current. The filter capacitor is a 4.7uF 50V capacitor that is used to eliminate DC ripple. Clamping circuit
The transformer acts as a huge inductor at both ends of the power driver IC VIPer22. Therefore, during the shutdown cycle, the transformer produces high voltage spikes due to the leakage inductance of the transformer. These high frequency voltage spikes are harmful to power driver ics and can cause switching circuit failures. Therefore, this needs to be clamped through the transformer by a diode. D1 and D2 are used for clamping circuits. D1 is a TVS diode and D2 is an ultra-fast recovery diode. D1 is used to clamp the voltage, while D2 is used to block the diode. By design, the target clamp voltage (VCLAMP) is 200V. Therefore, P6KE200A selected UF4007 as its D2 to solve problems related to ultra-fast blocking.
Magnetic and current isolation. A transformer is a ferromagnetic transformer that not only converts high-voltage alternating current into low-voltage alternating current, but also provides current isolation. It has three winding sequences. Primary, auxiliary or offset windings and secondary windings. EMI filter. EMI filtering is done by the C4 capacitor. It increases the immunity of the circuit to reduce high EMI interference. This Y-class capacitor is rated at 2kV. Secondary rectifier and buffer circuit. The output of the transformer is rectified and converted to DC using a Schottky rectifier diode D6. Since the output current is 2A, the 3A 60V diode is selected for this purpose. The SB360 is a 3A 60V rated Schottky diode.
ABB KVC758A124 3BHE021951R1024 transformer input surge and fault protection
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