Apparatus and method for controlling low voltage DC/DC converter by using input current information on low voltage DC/DC converter

摘要

A low voltage DC/DC converter (LDC) control apparatus for controlling an LDC including a transformer and a PWM controller is provided. The low voltage DC/DC converter (LDC) control apparatus includes an input current calculating unit calculating an input current of the LDC by using magnetization inductance information on the transformer and effective duty information on the PWM controller; an output current calculating unit calculating the instantaneous value and average value of an output current based on the input current calculated by the input current calculating unit; and an LDC control unit generating a control signal for over current protection (OCP) or power limit based on the instantaneous value and average value of the output current calculated by the output current calculating unit, wherein the LDC control unit outputs the generated control signal to the PWM controller.

主权项

1. A low voltage DC/DC converter (LDC) control apparatus for controlling an LDC including a transformer and a PWM controller, the low voltage DC/DC converter (LDC) control apparatus comprising:
an input current calculating unit configured to calculate an input current of the LDC by using magnetization inductance information on the transformer and effective duty information on the PWM controller; an output current calculating unit configured to calculate the instantaneous value and average value of an output current based on the input current calculated by the input current calculating unit; and an LDC control unit configured to generate a control signal for over current protection (OCP) or power limit based on the instantaneous value and average value of the output current calculated by the output current calculating unit, wherein the LDC control unit is further configured to output the generated control signal to the PWM controller, wherein the input current calculating unit is further configured to use the inductance L of the transformer, the magnetization inductance Lm of the transformer, the duty D of the PWM controller, the duty error d of the PWM controller, the section efficiency of the LDC, the number n of primary windings of the transformer and the number m of secondary windings of the transformer that are read from the memory, the input voltage of the LDC measured at the input of the LDC, and the output voltage of the LDC measured at the output of the LDC to calculate the input current of the LDC.