Charging Circuit for Bootstrap Capacitor and Integrated Driver Circuit Using Same
AssigneeRichtek Technology Corporation
InventorsKuang-Ming Chang, Chien-Hsing Cheng
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Abstract
The present invention discloses a charging circuit for charging a bootstrap capacitor from a supply voltage, the charging circuit comprising: a depletion mode transistor, having a first end of its source/drain electrically connected with the supply voltage, a gate electrically connected to the supply voltage, and a second end of its source/drain electrically connected with the bootstrap capacitor. Preferably, a diode is provided between the supply voltage and the depletion mode transistor.
Claims13
A charging circuit for charging a bootstrap capacitor from a supply voltage, the charging circuit comprising:
- a depletion mode transistor, having a first end of its source/drain electrically connected with the supply voltage, a gate electrically connected to the supply voltage, and a second end of its source/drain electrically connected with the bootstrap capacitor.
An integrated driver circuit for controlling at least a power transistor, the integrated driver circuit comprising:
- an up-gate driver circuit for controlling a first power transistor, the up-gate driver circuit having a first voltage terminal electrically connected with a first voltage node, and a second voltage terminal electrically connected with a second voltage node;
- and
- a depletion mode transistor, having a first end of its source/drain electrically connected with a supply voltage, a gate electrically connected to the supply voltage, and a second end of its source/drain electrically connected with the first voltage node.
A half-bridge power supplier circuit for supplying a voltage to a load, the half-bridge power supplier circuit comprising:
- a first and a second power transistors electrically connected with each other;
- an up-gate driver circuit for controlling the first power transistor, the up-gate driver circuit having a first voltage terminal electrically connected with a first voltage node, and a second voltage terminal electrically connected with a second voltage node;
- a low-gate driver circuit for controlling the second power transistor;
- a bootstrap capacitor electrically connected between the first voltage node and the second voltage node;
- and
- a depletion mode transistor, having a first end of its source/drain electrically connected with a first supply voltage, a gate electrically connected to the first supply voltage, and a second end of its source/drain electrically connected with the first voltage node.
Dependencies are inferred from the claim text.