| 摘要 |
PROBLEM TO BE SOLVED: To read a battery temperature by a controller in use of a battery and by a charger with the battery connected to the controller when charging without using a relay circuit having a large electric power consumption and a large mounting space. SOLUTION: This battery temperature detection circuit comprises a first transistor and a second transistor. A base and a collector of the first transistor are connected to each other, the collector is connected to a control power source through a first resistor, and a battery temperature sensor is connected between an emitter of the first transistor and a ground. A base of the second transistor is connected to the base of the first transistor, a collector of the second transistor is directly connected to the control power source, and an emitter of the second transistor is connected to the ground through a second resistor. An emitter electric potential of the second transistor is read as a temperature sensor value. Therefore, the single battery temperature sensor can be also connected to the charger to detect a temperature without the influence of a controller. |
