Abstract:
The invention relates to an activation apparatus (20) for a galvanically decoupled direct voltage converter having a synchronous rectifier, comprising a signal generating device (22), which is designed to generate control signals (22c, 22d) for switch devices of the synchronous rectifier and a reference current signal (22b), a first comparator device (23), which is coupled to the signal generating device (22), and which is designed to detect the secondary-side output current (Jo) of the synchronous rectifier, compare it to the reference current signal (22b) and generate a current control signal in dependence on the comparison, and a pulse width modulation device (25), which is coupled to the signal generating device (22) and the first comparator device (23) and which is designed to generate pulse width modulated activation signals (25a) for the switch devices of the synchronous rectifier on the basis of the control signals (22c, 22d) and the current control signal, wherein the signal generating device (22) is furthermore designed to reduce the reference current signal (22b) within a first predetermined timespan to a predetermined reference current threshold.
Abstract:
The invention relates to an activation apparatus (20) for a galvanically decoupled direct voltage converter having a synchronous rectifier, comprising a signal generating device (22), which is designed to generate control signals (22c, 22d) for switch devices of the synchronous rectifier and a reference current signal (22b), a first comparator device (23), which is coupled to the signal generating device (22), and which is designed to detect the secondary-side output current (Jo) of the synchronous rectifier, compare it to the reference current signal (22b) and generate a current control signal in dependence on the comparison, and a pulse width modulation device (25), which is coupled to the signal generating device (22) and the first comparator device (23) and which is designed to generate pulse width modulated activation signals (25a) for the switch devices of the synchronous rectifier on the basis of the control signals (22c, 22d) and the current control signal, wherein the signal generating device (22) is furthermore designed to reduce the reference current signal (22b) within a first predetermined timespan to a predetermined reference current threshold.
Abstract:
In a boost converter operation, a first voltage that is independent of an input voltage of the boost converter is preset in the boost converter, having an increased voltage level compared to the input voltage, as the setpoint output voltage, as long as the input voltage is below a first voltage threshold value, which is lower than the first voltage. As soon as the input voltage exceeds the first voltage threshold value, a second voltage that is a function of the input voltage is preset, having a lower voltage level compared to the input voltage, as the setpoint output voltage. As soon as the input voltage drops below a second voltage threshold value, which is lower than the first voltage, the first voltage is again preset as the setpoint output voltage.
Abstract:
In a boost converter operation, a first voltage that is independent of an input voltage of the boost converter is preset in the boost converter, having an increased voltage level compared to the input voltage, as the setpoint output voltage, as long as the input voltage is below a first voltage threshold value, which is lower than the first voltage. As soon as the input voltage exceeds the first voltage threshold value, a second voltage that is a function of the input voltage is preset, having a lower voltage level compared to the input voltage, as the setpoint output voltage. As soon as the input voltage drops below a second voltage threshold value, which is lower than the first voltage, the first voltage is again preset as the setpoint output voltage.