Asymmetric duty control of a half bridge power converter
First Claim
1. A power converter circuit, comprising:
- a half bridge power converter coupled between a direct current (DC) supply voltage node and a reference voltage node;
a transmitter coil coupled to the half bridge power converter; and
a duty controller coupled between the half bridge power converter and the DC supply voltage node, whereinthe duty controller is configured to;
receive power from the DC supply voltage node; and
adjust a duty cycle of the half bridge power converter based on a real-time voltage level at the DC supply voltage node, thereby compensating for variations in the real-time voltage level at the DC supply voltage node.
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Accused Products
Abstract
A half bridge power converter can be coupled to, or included in, a wireless transmitter device. The half bridge power converter includes an upper switching element connected between a direct current supply voltage and a lower switching element. A duty controller is coupled to the upper and the lower switching elements and is configured to asymmetrically control the duty cycles of the upper and lower switching elements based on a voltage level of the direct current supply voltage. In general, the duty cycle of the lower switching element is different than the duty cycle of the upper switching element. Additionally or alternatively, the duty controller is configured to determine and control the duty cycles of the upper and lower switching elements to adjust a direct current gain of a wireless energy transfer system that includes the wireless transmitter device.
183 Citations
20 Claims
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1. A power converter circuit, comprising:
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a half bridge power converter coupled between a direct current (DC) supply voltage node and a reference voltage node; a transmitter coil coupled to the half bridge power converter; and a duty controller coupled between the half bridge power converter and the DC supply voltage node, wherein the duty controller is configured to; receive power from the DC supply voltage node; and adjust a duty cycle of the half bridge power converter based on a real-time voltage level at the DC supply voltage node, thereby compensating for variations in the real-time voltage level at the DC supply voltage node. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless energy transfer system, comprising:
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a transmitter device, comprising; a half bridge power converter coupled between a direct current (DC) supply voltage source and a ground; a transmitter resonant circuitry coupled between the half bridge power converter and a transmitter coil; and a duty controller coupled between the half bridge power converter and the DC supply voltage source; and a receiver device, comprising; a receiver coil; and a receiver resonant circuitry coupled between the receiver coil and a load, wherein the duty controller is configured to; receive power from the DC supply voltage source; and adjust a gain transfer function of the wireless energy transfer system by controlling a duty cycle of the half bridge power converter based on a real-time voltage level of the DC supply voltage source, thereby compensating for variations in the real-time voltage level of the DC supply voltage source. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of operating a wireless transmitter device that includes a transmitter coil coupled to a half bridge power converter, the half bridge power converter comprising an upper switching element coupled in series with a lower switching element that operate at a fixed switching frequency, the method comprising:
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receiving a direct current (DC) supply voltage that is coupled to the upper switching element; and based on a voltage level of the DC supply voltage, controlling a first duty cycle of the upper switching element and a second duty cycle of the lower switching element asymmetrically to regulate an energy output of the transmitter coil, the asymmetrical duty control of the first and the second duty cycles causing the second duty cycle to be greater than the first duty cycle. - View Dependent Claims (15, 16)
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17. A method of operating a transmitter device in a wireless energy transfer system, the transmitter device comprising a transmitter coil coupled to a half bridge power converter that includes an upper switching element connected in series with a lower switching element, the method comprising:
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transmitting a first switch signal having a first duty cycle to the upper switching element and transmitting a second switch signal having a second duty cycle to the lower switching element to transfer energy from the transmitter coil, wherein a switching frequency of the half bridge power converter is fixed and the second duty cycle is greater than the first duty cycle; and adjusting the first and the second duty cycles to adjust a gain transfer function of the wireless energy transfer system, wherein the adjusted second duty cycle remains greater than the adjusted first duty cycle. - View Dependent Claims (18, 19, 20)
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Specification