Soft driving method of power MOSFET and circuit
A soft drive, MOS tube technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of not being a MOSFET drive circuit, large conduction loss, poor EMI performance, etc., to reduce EMI effects and reduce conduction. Loss, EMI reduction effect
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[0045] Example one
[0046] Such as Image 6 Shown is a circuit diagram of a power MOSFET soft drive circuit according to the first embodiment of the present invention. A soft drive circuit for a power MOSFET includes a current bias unit A11, a drive chain unit A12 and a positive feedback current generation unit A13.
[0047] Current bias unit A11 and drive chain unit A12 and background technology figure 2 The circuits shown are the same, and only the number of each component marked with 10 is added to the front to distinguish it, and it will not be repeated here.
[0048] The positive feedback current generation unit A13 consists of resistor R102, resistor R103, N-channel MOS tube NM105, N-channel MOS tube NM106, N-channel MOS tube NM107, P-channel MOS tube PM104, and P-channel MOS tube. Tube PM105, P-channel MOS tube PM106, diode D1, logic NOT gate INV101, logic NOT gate INV102. The first port of the resistor R102, the gate of the N-channel MOS tube NM107, and the output of the ...
Example Embodiment
[0050] Example two
[0051] Such as Picture 9 As shown, it is a power MOSFET soft drive circuit diagram of the second embodiment of the present invention, including: a current bias unit A21, a drive chain unit A22, and a positive feedback current generation unit A23.
[0052] The current bias unit A21 is composed of a current mirror composed of P-channel MOS tube PM201, P-channel MOS tube PM202, and P-channel MOS tube PM203. The input bias current Ibp_40u is mirrored by the internal bias current of the chip through the current mirror. Obtained, the gate and drain of the P-channel MOS tube PM201, the gate of the P-channel MOS tube PM202, and the gate of the P-channel MOS tube PM203 are connected with the output terminal of the positive feedback current generating unit A23. The source and substrate of the P-channel MOS tube PM201, the source and substrate of the P-channel MOS tube PM202, and the source, substrate and drain of the P-channel MOS tube PM203 are generated inside the chi...
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