EVSE WITH CORDSET HANDLE TEMPERATURE MEASUREMENT
First Claim
6. The circuit for temperature measurement in a charging handle of an electric vehicle charging station of claim 4, wherein the thermistor is a negative temperature coefficient (NTC) thermistor, so that as the temperature in the charging handle increases, resistance of the thermistor decreases and current increases for negative portions of a control pilot signal on the control pilot line.
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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.
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Citations
10 Claims
- 6. The circuit for temperature measurement in a charging handle of an electric vehicle charging station of claim 4, wherein the thermistor is a negative temperature coefficient (NTC) thermistor, so that as the temperature in the charging handle increases, resistance of the thermistor decreases and current increases for negative portions of a control pilot signal on the control pilot line.
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6-1. 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.
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7-1. The method for temperature measurement in a charging handle of an electric vehicle charging station of claim 6, wherein the temperature sensor is a diode and a thermistor connected in series between the control pilot line and the ground line in the charging handle of the electric vehicle charging station.
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8-1. The method for temperature measurement in a charging handle of an electric vehicle charging station of claim 6, further comprising:
reducing a charging rate offered by the electric vehicle charging station to the electric vehicle, in response to determining that the temperature of the charging handle exceeds a predetermined threshold temperature.
Specification