摘要:
A control circuit for a switch element (T1) in a switching mode converter, used to convert an input voltage (Vin) into an output voltage (Vout). The circuit comprises:
a pulse width modulator circuit (13), configurated so as to provide a pulse-width-modulated actuating signal (S1) for the switch element (T1) depending on a regulating signal (S14) dependent on the output voltage (Vout) and a current measurement signal (Vc) dependent on a current through an inductive storage element (Lout), an arrangement (20) that provides the current measurement signal (Vc), wherein the arrangement (20) for providing the current measurement signal is a measuring and regulating arrangement, configured so as to simulate the current measurement signal (Vc) from a signal dependent on the output voltage (Vout), a signal dependent on the difference between the input voltage (Vin) and the output voltage (Vout), and at least a first sampled value of a signal (Vs) proportional to the current (Iout) across the inductive storage element (Lout) during a period of the pulse-width-modulated actuating signal (S1).
摘要:
A method is provided for actuating a switch (SW; T1) regulating the current uptake in one of at least two parallel switch transformer stages (3, 3_1, 3_n) of a multiphase DC voltage transformer, which has an output terminal for connecting a load and producing an output voltage (Vout) from an input voltage (Vin), wherein the method comprises the following steps:
providing a first control signal (S1), dependent on the output voltage (Vout), providing a current metering signal (S4) at least temporarily dependent on an output current (Iout) of the transformer stage (3), providing a clocked actuation signal (S3) having a sequence of actuation pulses for the at least one switch (SW; T1), whose duty cycle is controlled to a value depending on the first control signal (S1) and the current metering signal (S4), at which the mean value of the output current (Iout) is proportional to the first control signal (S1).