Pulse-width modulator for controlling a semiconductor circuit breaker
AssigneeInfineon Technologies AG
InventorMartin Feldtkeller
Life of this patent
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Abstract
A pulse-width modulator for controlling a semiconductor circuit-breaker in a switched-mode power supply has a comparator circuit for generating control pulses determined by an oscillator signal. Whereby a duration of the individual control pulses depends on a first control signal and a second control signal. A measuring configuration is provided for generating a load-current signal that is dependent on a load current of the circuit-breaker. Furthermore, the modulator has a feedback branch for feeding back the load-current signal to the comparator circuit whereby the feedback branch has a low-pass configuration. The low-pass configuration has an input which receives the load-current signal and an output at which the second control signal can be picked off.
Claims10
A pulse-width modulator for controlling a semiconductor circuit-breaker in a switched-mode power supply, the pulse-width modulator comprising:
- a comparator circuit for receiving an oscillator signal, a first control signal, and a second control signal, said comparator circuit generating control pulses in dependence on the oscillator signal, the control pulses each having a duration dependent on the first control signal and the second control signal;
- a measuring configuration for receiving a load current from a semiconductor circuit-breaker and generating a load-current signal dependent on the load current of the semiconductor circuit-breaker;
- and
- a feedback circuit generating the second control signal by adding the load-current signal to a constant signal when the semiconductor circuit breaker is closed, said feedback circuit including a filter for filtering out high-frequency components of the load-current signal.
Dependencies are inferred from the claim text.