Wireless Power Receiver with Programmable Power Path
First Claim
1. A synchronous rectifier circuit comprising:
- a first and second high side switches coupled to a first and second input nodes and an output node for outputting a rectified voltage;
a first and second low side switches coupled to the first and second input nodes and a ground node;
a first and second high side comparators that control the first and the second high side switches respectively; and
a first and second low side comparators that control the low side switches respectively, wherein the low side switches are cross coupled via the low side comparators.
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Abstract
A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
19 Citations
20 Claims
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1. A synchronous rectifier circuit comprising:
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a first and second high side switches coupled to a first and second input nodes and an output node for outputting a rectified voltage; a first and second low side switches coupled to the first and second input nodes and a ground node; a first and second high side comparators that control the first and the second high side switches respectively; and a first and second low side comparators that control the low side switches respectively, wherein the low side switches are cross coupled via the low side comparators. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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receiving an input power from a first and second input nodes and outputting a rectified voltage onto an output node by a synchronous rectifier circuit, wherein the circuit comprises a first and second high side switches coupled to the first and second input nodes and the output node, and wherein the circuit further comprises a first and second low side switches coupled to the first and second input nodes and a ground node; controlling the first and the second high side switches by a first and second high side comparators respectively; and controlling the first and the second low side switches by a first and second low side comparators respectively, wherein the low side switches are cross coupled via the low side comparators. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification