Boosted output inverter for electronic devices
First Claim
1. A power converter comprising:
- a primary tank inductor comprising;
a first input lead to receive regulated direct current from a power source; and
a first output lead;
a first switch comprising;
a source lead coupled to the first output lead of the primary tank inductor; and
a first drain lead;
an output capacitor coupling the first drain lead of the first switch to ground;
a second switch, comprising a second drain lead coupled to the first output lead of the primary tank inductor; and
a secondary tank inductor comprising;
a second input lead coupled directly to the first output lead of the primary tank inductor; and
a second output lead coupled through a resonant capacitor to ground.
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Accused Products
Abstract
A power converter can be implemented with a boosted-output inverter, which integrates the functionality of a voltage converter (e.g., boost converter) and a voltage inverter. In particular, a boosted-output inverter includes a primary tank inductor coupled in series with a secondary tank inductor at a central node. The boosted-output inverter also includes two voltage-controlled switches that respectively define a charging phase and a discharging phase of the primary tank inductor. While the primary tank inductor is charging, the secondary tank inductor is inverted to ground. In this manner, current though the secondary tank inductor alternates at a voltage boosted by the fly-back voltage of the primary tank inductor exhibited when the primary tank inductor transitions from the charging mode to the discharging mode. In many cases, the secondary tank inductor is a transmit coil of a transmitter of a wireless power transfer system.
174 Citations
19 Claims
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1. A power converter comprising:
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a primary tank inductor comprising; a first input lead to receive regulated direct current from a power source; and a first output lead; a first switch comprising; a source lead coupled to the first output lead of the primary tank inductor; and a first drain lead; an output capacitor coupling the first drain lead of the first switch to ground; a second switch, comprising a second drain lead coupled to the first output lead of the primary tank inductor; and a secondary tank inductor comprising; a second input lead coupled directly to the first output lead of the primary tank inductor; and a second output lead coupled through a resonant capacitor to ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power converter comprising:
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an output capacitor coupled to ground; a half-bridge comprising; a high-side switch coupled to ground via the output capacitor; a low-side switch coupled to ground directly; and a central node between a source of the high-side switch and a drain of the low-side switch; a boost inductor coupled to the central node; a resonant circuit comprising a secondary tank inductor directly coupled to the central node; and a processor coupled to the half-bridge and configured to drive the high-side switch and low-side switch at substantially opposite duty cycles and at a resonant frequency of the resonant circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of converting low-voltage direct current to a higher-voltage alternating current, the method comprising:
at a selectable duty cycle; enabling a low-side MOSFET of a power converter to connect a primary tank inductor to ground; and disabling the low-side MOSFET and enabling a high-side MOSFET to connect an output of the primary tank inductor to an input lead of a secondary tank inductor and parallel to an output capacitor; and adjusting the selectable duty cycle to change current through the secondary tank inductor. - View Dependent Claims (17, 18, 19)
Specification