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发明公开
CN106787638A 一种适用于电流型PWM控制器的动态补偿线路 有权

一种适用于电流型PWM控制器的动态补偿线路
摘要：
本发明公开了一种适用于电流型PWM控制器的动态补偿线路，其 PWM控制电路的驱动脚分别与R1、R5一端相连，R1另一端分别与R2一端、开关管T1的栅极相连，R2另一端接地；开关管T1的漏极与变压器BT1初级绕组的一端相连，BT1初级绕组另一端与输入端+Vin相连；T1的源极分别与电阻R4一端、电阻R3一端、二极管D1阴极相连；二极管D1阳极与电阻R5另一端相连，电阻R4另一端接地；PWM控制电路的电流检测端与电阻R3的一端、二极管D2的阳极相连，二极管D2的阴极分别与电阻R6一端、电容C2一端相连，电阻R6和电容C2另一端接地。本发明有效降低了补偿电阻的损耗，电源模块的过流保护功能更加灵敏，使得PWM电流型工作方式更加适合高压输入和大功率DC/DC电源模块。
摘要（英）：

The invention discloses a dynamic compensation line applicable to a current type PWM controller. The dynamic compensation line is characterized in that the drive pin of a PWM control circuit is respectively connected with one ends of R1 and R5, the other end of R1 is respectively connected with one end of R2 and the grid of a switch tube T1, and the other end of R2 is grounded; the drain of the switch tube T1 is connected with one end of the primary winding of a transformer BT1, and the other end of the primary winding of the transformer BT1 is connected with an input end +Vin; the source of T1 is respectively connected with one end of a resistor R4, one end of a resistor R3 and the cathode of a diode D1; the anode of the diode D1 is connected with the other end of the resistor R5, and the other end of the resistor R4 is grounded; the current detecting end of the PWM control circuit is connected with one end of a resistor R3 and the anode of a diode D2, the cathode of the diode D2 is respectively connected with one end of a resistor R6 and one end of a capacitor C2, and the other ends of the resistor R6 and the capacitor C2 are grounded. The dynamic compensation line has the advantages that the loss of compensation resistors are lowered effectively, the overcurrent protecting function of a power module is sensitive, and the PWM current type working manner is more suitable for the high-voltage-input and large-power DC/DC power module.

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