Bootstrap compensation circuit and power module
AssigneeMitsubishi Electric Corporation
InventorsHiroshi Yoshida, Kyoko Oyama
Life of this patent
Estimating the term…
Abstract
A bootstrap compensation circuit includes: a plurality of resistors series-connected between a floating potential corresponding to a high-voltage-side potential and a reference potential; a second capacitor that has one end connected to a divided potential extraction point and has the other end connected to the reference potential, the divided potential extraction point located between the plurality of resistors; and an output circuit which supplies current to a first capacitor, according to a potential of the divided potential extraction point.
Claims9
A bootstrap compensation circuit which supplies current to a bootstrap circuit, said bootstrap circuit including a first capacitor connected between a reference potential, which is a connection point between a high-side switching element and a low-side switching element, and each of a high-side control circuit and a low-side control circuit, respectively, where the switching elements are totem-pole connected between a high-voltage-side potential and a low-voltage-side potential, said bootstrap compensation circuit comprising:
- a plurality of resistors series-connected between a floating potential corresponding to said high-voltage-side potential and said reference potential;
- a second capacitor, one end of which is connected to a divided potential extraction point and the other end of which is connected to said reference potential, the divided potential extraction point being a point between said plurality of resistors;
- and
- an output circuit which supplies current to said first capacitor, based on a potential of said divided potential extraction point.
A bootstrap compensation circuit which supplies current to a bootstrap circuit, said bootstrap circuit including a capacitor connected between a reference potential, which is a connection point between a high-side switching element and a low-side switching element, and each of a high-side control circuit and a low-side control circuit, respectively, where the switching elements are totem-pole connected between a high-voltage-side potential and a low-voltage-side potential, said bootstrap compensation circuit comprising:
- a plurality of first resistors series-connected between a floating potential corresponding to said high-voltage-side potential and said reference potential;
- a first MOSFET whose drain is connected to a divided potential extraction point and whose source and gate are connected to said reference potential, the divided potential extraction point being a point between said plurality of first resistors;
- and
- an output circuit which supplies current to said capacitor, based on a potential of said divided potential extraction point.
Dependencies are inferred from the claim text.