Level shifter for power converters

A level shifter, comprising:

• a differential detector;
• a first transistor having a drain electrically connected to a first node of the differential detector, a gate, and a source;
• a second transistor having a drain electrically connected to a second node of the differential detector, a gate, and a source;
• a common capacitor having a first terminal and a second terminal;
• a first switch device electrically connected between a first DC supply voltage or a local ground reference and the first terminal of the common capacitor;
• a second switch device electrically connected between the first terminal of the common capacitor and ground or a bootstrap node;
• and
• a third switch device electrically connected between the second terminal of the common capacitor and ground or the bootstrap node,
• wherein the second terminal of the common capacitor is electrically connected to the source of the first and the second transistors.

A power converter, comprising:

• a high-side power switch device;
• a gate driver configured to drive a gate of the high-side power switch device;
• and
• a level shifter,
• wherein the level shifter comprises:
• a differential detector;
• a first transistor having a drain electrically connected to a first node of the differential detector, a gate, and a source;
• a second transistor having a drain electrically connected to a second node of the differential detector, a gate, and a source;
• and
• a circuit configured to simultaneously apply a same voltage to the source of the first and the second transistors based on a digital signal input to the level shifter,
• wherein the differential detector is configured to translate the digital signal to a voltage domain of the gate driver based on a differential current between the first transistor and the second transistor.