Accurate high-voltage gate detector
AssigneepSemi Corporation
InventorBuddhika Abesingha
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Abstract
Systems, methods, and devices for accurate sensing of gate voltages of high-voltage devices are presented. A gate sense circuit can generate accurate transitions of the gate voltages via a differential input provided by a gate node voltage and a source node voltage of the high-voltage devices. The differential input is fed to two separate processing paths, one path for accurate detection of a rising edge of the gate voltage with a reduced propagation delay, and the other path for accurate detection of a falling edge of the gate voltage with a reduced propagation delay. A switch selects an output of the two paths that accurately detects a next edge to be detected. An Output pulse signal defined by the detected rising and falling edges is generated based on the output of the switch.
Claims19
A detection circuit configured to detect a gate voltage of a high-voltage device, the high-voltage device capable of withstanding a voltage higher than a first voltage (VIN), the detection circuit comprising:
- a gate sense circuit that is coupled to a gate node and a source node of the high-voltage device to sense a gate-to-source voltage of the high-voltage device, the gate sense circuit comprising:
- a) a first conduction path for sensing a rising edge of the gate-to-source voltage to generate therefrom a rising edge of a first output signal at an output node of the first conduction path with a reduced propagation delay;
- and
- b) a second conduction path for sensing a falling edge of the gate-to-source voltage to generate therefrom a rising edge of a second output signal at an output node of the second conduction path with a reduced propagation delay;
- and
- a switch coupled to the gate sense circuit, the switch configured to selectively output:
- the first output signal if a next edge for sensing is the rising edge of the gate-to-source voltage, and
- the second output signal if the next edge for sensing is the falling edge of the gate-to-source voltage,
- wherein
- the detection circuit is configured to generate a detected output pulse based on the output of the switch.
Dependencies are inferred from the claim text.