DC/DC converter and method for the current control of a DC/DC converter

摘要

A DC/DC converter includes an input to which an input current is supplied, an output at which an output current is provided, and a current control circuit coupled to the input and the output includes a unit that provides an instantaneous value signal proportional to the output current of the DC/DC converter with the aid of the input current, an internal input that supplies a reference signal, and a comparison device coupled to the unit that provides the instantaneous value signal and the internal input and comprises an internal output that provides a control signal dependent on a comparison of the instantaneous value signal with the reference signal, wherein the control signal adjusts the output current of the DC/DC converter.

主权项

1. A DC/DC converter comprising:
an input to which an input current (Iin) is supplied, an output at which an output current (Iout) is provided, and a current control circuit coupled to the input and the output, comprising:
an internal input that supplies a reference signal (Sref) which is clocked with a duty cycle of the DC/DC converter and provided as a pulsed reference signal (Sref′), anda unit that provides an instantaneous value signal (Sin) using the input current (Iin), the instantaneous value signal (Sin) being proportional to the output current (Iout) of the DC/DC converter, wherein the unit that provides an instantaneous value signal (Sin) comprises a measuring device that measures the input current (Iin) of the DC/DC converter or an input voltage (Vin) proportional to the input current (Iin) of the DC/DC converter, wherein the current control circuit further comprises a first and a second low-pass filter and a comparison device, the first low pass filter is coupled between the unit that provides the instantaneous value signal (Sin) and a first input of the comparison device and provides an average value of the instantaneous value signal (Sin) as an averaged instantaneous value signal ( Sin), the second low pass filter is coupled between the internal input and a second input of the comparison device and provides the average of the pulsed reference signal (Sref′) as an averaged pulsed reference signal ( Sref′), and the comparison device comprises an internal output that provides a control signal (Sctrl) dependent on a comparison of the averaged instantaneous value signal ( Sin) to the averaged pulsed reference signal ( Sref′), wherein the control signal (Sctrl) adjusts the output current (Iout) of the DC/DC converter.