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US 10,594,210 B1Granted
Transient response optimization for charge-pump-based two-stage power converter
AssigneeDialog Semiconductor (UK) Limited
InventorsMark Mercer, Karthik Jayaraman, Chanchal Gupta, Kevin Dowdy
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Abstract
A two-stage power converter includes a dual-level driver to control a current conducted by a switch transistor in a charge pump to control the charging of a flying capacitor in the charge pump.
Claims20
A two-stage power converter, comprising:
- a boost converter configured to boost an input voltage into an intermediate voltage;
- and
- a charge pump including a flying capacitor and a plurality of switch transistors, wherein the charge pump is configured to boost the intermediate voltage into an output voltage during a normal mode of operation, and wherein the charge pump is further configured to pass the intermediate voltage as the output voltage during a bypass mode of operation, and wherein the charge pump further includes:
- a dual-level driver including a diode-connected transistor and a current control circuit configured to control a first current conducted by the diode-connected transistor during a first transition mode of operation from the bypass mode of operation to the normal mode of operation, wherein the current control circuit is further configured to control a first switch transistor from the plurality of switch transistors to conduct a current proportional to the first current during the first transition mode of operation.
1 more element
A method for a two-stage power converter;
- comprising:
- during a bypass mode of operation, converting an input voltage in a boost converter into an intermediate voltage and passing the intermediate voltage though a charge pump as an output voltage;
- during a transition mode of operation out of the bypass mode of operation, controlling a current conducted by a first switch transistor coupled to a flying capacitor in the charge pump responsive to a first current conducted by a diode-connected transistor to charge a voltage for the flying capacitor;
- and
- during a normal mode of operation following the bypass mode of operation, cycling the first switch transistor in the charge pump so that the output voltage is greater than the intermediate voltage.
2 more elements
Dependencies are inferred from the claim text.