Mutual blanking for a multi-channel converter
AssigneeRichtek Technology Corporation
InventorsAn-Tung Chen, Jun-Yao Huang, Fu-Shiang Lai
Life of this patent
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Abstract
A shutter circuit is provided for a multi-channel converter to blank the switching noise produced by the switching of the converter. The shutter circuit monitors the switching of the switches in the output stages of the converter, and when one channel performs switching, the shutter circuit will send a signal to other channels to block the current sensors thereof. The current sensors are so blocked for a period not to sense the switching noise. The mutual interference between the channels due to the switching noise of the converter is eliminated.
Claims18
A switching converter, comprising:
- a plurality of channels, each channel including:
- an outputting stage having at least one switch thereof;
- a controller in response to a first signal to generate a second signal to switch the at least one switch for generating an output current;
- and
- a current sensor monitoring the output current to generate the first signal;
- and
- a shutter circuit connected to each of the current sensors in the channels;
- wherein when any one of the channels produces a switching noise due to a switching of the at least one switch thereof, the shutter circuit blanks the switching noise.
A method for blanking a switching noise in a multi-channel switching converter, each channel including a current sensor monitoring an output current to generate a first signal and an output stage having at least one switch being switched by a second signal derived from the first signal to generate the output current, the method comprising the steps of:
- A. detecting a switching of the at least one switch in one of the channels;
- and
- B. blanking a switching noise caused by the switching of the at least one switch.
Dependencies are inferred from the claim text.