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US 5,705,948 AGranted
Self clocking, variable frequency boost circuit
AssigneeDelco Electronics Corporation
InventorDavid Dale Moller
Life of this patent
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Abstract
A boost circuit effects increasing current flow through an inductor and a switch when the switch is closed, and then, when the switch is open, directs the inductor current through a diode to charge a storage capacitor at the output. A logic circuit operates the switch. The switch is controlled on by sensing low current flow in the capacitor and off by sensing high current flow in the switch, so that inductor current is continuous.
Claims7
A boost power supply for producing an output voltage at an output higher than a supply voltage at an input comprising:
- an inductor and a diode joined at a node and serially coupled between an input and an output;
- a storage capacitor coupled between the output and ground;
- a switch connected between the node and ground whereby inductor current flows through the switch at increasing values when the switch is closed to attain a peak value and then when the switch is open inductor current flows through the diode to the output at decreasing values to charge the capacitor;
- a control circuit for operating the switch including
- means responsive to the current flow through the switch for opening the switch when the current flow through the switch attains a set maximum value, and
- means responsive to current flow through the storage capacitor for closing the switch when the current flow through the capacitor decreases to a set value;
- whereby the storage capacitor current and the switch current determine switch cycling.
4 more elements
Dependencies are inferred from the claim text.