Short-circuit protection method for buffer output of DC/DC (Direct-Current/Direct-Current) power supply converter and buffer output circuit
A short-circuit protection circuit and snubber circuit technology, which is applied in the direction of output power conversion devices and electrical components, can solve the problems of loss of snubber circuit protection, increased drain-source internal resistance, increased voltage, and high short-circuit power consumption of power converters, etc. Problems, achieve the effect of reducing short-circuit power consumption, wide application fields, and low cost
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Embodiment 1
[0041] For the buffer circuit with output short-circuit protection in Embodiment 1, the parameter values are as follows: DC / DC module power supply input voltage is 12V, the value of the first voltage dividing resistor R1 is 220Ω, the value of the second voltage dividing resistor R2 is 100KΩ, the first current limiting The value of resistor R3 is 300Ω, the second current-limiting resistor R4 is short-circuited, the buffer capacitor C1 and the delay capacitor C2 are both 1uf, the diode D1 is a diode of the type BAS16, and the buffer MOS tube T1 is an N-MOS tube of the type IRLR024. The first NPN transistor T2 is an NPN transistor 491 , and the second NPN transistor T3 is an NPN transistor 3904 . The measured threshold voltage Vgs(th) of the IRLR024MOS tube is actually 1.2V (the specification Vgs(th) is 1V-2V), and the trigger voltage of the short circuit protection circuit V1=Vbe(T2)+Vbe(T3)=0.6+ 0.6=1.2V. According to formula (1-1), take Vc=Vgs(th)=1.2V, VCC=Vo=5V, R=R1=220Ω...
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