Zero-crossing detection circuit
AssigneeRohm Co., Ltd.
InventorsSatoru Nate, Akinobu Sawada, Natsuki Yamamoto
Life of this patent
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Abstract
A zero-crossing detection unit configured to be fed with a first monitoring target signal and a second monitoring target signal based on an AC signal to detect zero-crossing of the AC signal, in which the zero-crossing detection circuit includes: a zero-crossing detection unit including a comparator configured to compare together the first and second monitoring target signals to generate a comparison signal; and an output unit configured to be fed with a zero-crossing detection signal based on the comparison signal to output from an external output terminal an output signal indicating zero-crossing timing of the AC signal, in which the output unit includes an open-drain transistor connected to the external output terminal.
Claims15
A zero-crossing detection circuit configured to be fed with a first monitoring target signal and a second monitoring target signal based on an AC signal to detect zero-crossing of the AC signal, the zero-crossing detection circuit comprising:
- a zero-crossing detection unit including a comparator configured to compare together the first and second monitoring target signals to generate a comparison signal;
- and
- an output unit configured to be fed with a zero-crossing detection signal based on the comparison signal to output from an external output terminal an output signal indicating zero-crossing timing of the AC signal,
- wherein
- the output unit includes an open-drain transistor connected to the external output terminal.
Dependencies are inferred from the claim text.