HW and methods for improving safety protocol in wireless chargers
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorYannick Guedon
Life of this patent
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Abstract
An over-voltage protection circuit and methods of operation are provided. In one embodiment, a method includes monitoring a voltage at an output of a rectifier, a voltage at an output of a voltage regulator, or a combination thereof. The method further includes determining the over-voltage condition based on the monitoring; and in response to determining the over-voltage condition, regulating the voltage at the output of the rectifier in accordance with a voltage difference between the voltage at the output of the rectifier and the voltage at the output of the voltage regulator.
Claims20
A method for regulating an over-voltage condition in a wireless power system, the method comprising:
- receiving, by a receiving device of the wireless power system, an alternating current voltage;
- converting the alternating current voltage to a direct current voltage;
- converting the direct current voltage to a first regulated direct current voltage;
- determining that the alternating current voltage exceeds a steady-state operating condition and, based thereon, converting the direct current voltage to a second regulated direct current voltage;
- measuring a voltage value of the direct current voltage across a sense resistor;
- calculating a power value received at the receiving device at the sense resistor;
- and communicating the power value received to a transmitting device of the wireless power system.
A method for regulating an over-voltage condition in a receiving device of a wireless power system, the method comprising:
- converting an alternating current voltage received from a transmitting device of the wireless power system to a direct current voltage;
- converting the direct current voltage to a first regulated direct current voltage;
- determining that the alternating current voltage exceeds a steady-state operating condition comprising determining that a difference between the direct current voltage and the first regulated direct current voltage exceeds a first threshold and, based thereon, converting the direct current voltage to a second regulated direct current voltage;
- measuring a voltage value of the direct current voltage across a sense resistor;
- calculating a power value received at the receiving device at the sense resistor;
- and communicating the power value received to the transmitting device of the wireless power system.
A receiving device of a wireless power system, the receiving device comprising:
- a rectifier configured to convert an alternating current voltage to a direct current voltage;
- a voltage regulator configured to convert the direct current voltage to a first regulated direct current voltage;
- a sense resistor configured to measure a voltage value of the direct current voltage;
- and
- a monitoring circuit configured to:
- determine that the alternating current voltage exceeds a steady-state operating condition based on a combinational logic of a value of the direct current voltage, the first regulated direct current voltage, and a difference between the direct current voltage and the first regulated direct current voltage and, based thereon, convert the direct current voltage to a second regulated direct current voltage,
- calculate a power value received at the receiving device at the sense resistor, and
- communicate the power value received to a transmitting device of the wireless power system.
Dependencies are inferred from the claim text.