EVSE with cordset handle temperature measurement
First Claim
1. A charging handle of an electric vehicle charging station with a circuit for temperature measurement of said handle, said circuit comprising:
- a temperature sensor connected between a control pilot line and a ground line in a charging handle of an electric vehicle charging station, wherein a change in current conducted from the ground line to the control pilot line occurs when the temperature sensor is exposed to a change in temperature in the charging handle; and
a temperature monitor in the charging station, the temperature monitor being coupled to a pilot signal measurement circuit connected to the control pilot line, to measure negative portions of the control pilot signal resulting from the temperature sensor conducting current from the ground line to the control pilot line in response to changes in the temperature in the charging handle; and
wherein, before charging starts, the pilot signal measurement circuit is configured to interpret a negative control pilot signal that is more positive than a negative reference voltage, as abnormal behavior for an electric vehicle load, and after charging starts, the pilot signal measurement circuit is configured to interpret a negative control pilot signal that is more positive than the negative reference voltage, as a temperature change, and not as abnormal behavior for an electric vehicle load.
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Accused Products
Abstract
A circuit measures temperature in a charging handle 150 of an electric vehicle charging station (EVSE) 100. A temperature sensor is connected between a control pilot line 115 and ground line G in the charging handle of the EVSE. The control pilot line transmits a square wave signal CP having positive and negative portions, to an electric vehicle, according to the SAE J1772 standard. A temperature monitor 300 in the EVSE, coupled to a pilot signal measurement circuit 230 in the EVSE, measures the negative portions of the square wave signal resulting from the temperature sensor conducting current in response to changes in temperature in the handle. Temperature measurement of the charging handle is achieved without significant added cost or complexity, by reusing existing components in the EVSE, with little or no modification required to EVSE electronics, and minimal modification of the handle.
60 Citations
13 Claims
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1. A charging handle of an electric vehicle charging station with a circuit for temperature measurement of said handle, said circuit comprising:
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a temperature sensor connected between a control pilot line and a ground line in a charging handle of an electric vehicle charging station, wherein a change in current conducted from the ground line to the control pilot line occurs when the temperature sensor is exposed to a change in temperature in the charging handle; and a temperature monitor in the charging station, the temperature monitor being coupled to a pilot signal measurement circuit connected to the control pilot line, to measure negative portions of the control pilot signal resulting from the temperature sensor conducting current from the ground line to the control pilot line in response to changes in the temperature in the charging handle; and wherein, before charging starts, the pilot signal measurement circuit is configured to interpret a negative control pilot signal that is more positive than a negative reference voltage, as abnormal behavior for an electric vehicle load, and after charging starts, the pilot signal measurement circuit is configured to interpret a negative control pilot signal that is more positive than the negative reference voltage, as a temperature change, and not as abnormal behavior for an electric vehicle load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 13)
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9. A method for temperature measurement in a charging handle of an electric vehicle charging station, comprising:
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transmitting on a control pilot line to an electric vehicle connected to a charging handle, a control pilot signal having positive and negative voltage portions; measuring negative portions of the control pilot signal, resulting from a temperature sensor in the charging handle conducting current from a ground line to the control pilot line in response to changes in temperature in the charging handle; and determining that the temperature of the charging handle exceeds a predetermined threshold temperature, based on the measurement; wherein, before charging starts, a negative control pilot signal that is more positive than a negative reference voltage, is interpreted as abnormal behavior for an electric vehicle load, and after charging starts, a negative control pilot signal that is more positive than the negative reference voltage, is interpreted as a temperature change, and not as abnormal behavior for an electric vehicle load. - View Dependent Claims (11, 12)
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Specification