Bluetooth headset and temperature screening circuit therein
A technology of bluetooth earphones and circuits, applied in earpiece/earphone accessories, electrical components, loudspeakers, etc.
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Embodiment 1
[0023] The bluetooth earphone of this embodiment is as figure 1 As shown, the bluetooth chip 1, the left earphone 2 and the right earphone 3 are included, the left earphone 2 and the right earphone 3 are respectively equipped with batteries 21, 31, and the power supply lines of the batteries 21, 31 are respectively provided with NTC thermistors. The voltage divider circuit connects the voltage divider contacts NTC-R and NTC-L of the two voltage divider circuits to the Bluetooth chip 1 through the temperature screening circuit 6, wherein the voltage divider contacts are used to collect the temperature data of the NTC thermistor, so Called the temperature collection point.
[0024] temperature screening circuit 6 as figure 2 As shown, it consists of three comparators U1, U2, U3 plus two dual-stage electric control switches SW1, SW2, where the temperature collection point NTC-R is respectively connected to the positive input terminal of comparator U1, comparator U2 The negativ...
Embodiment 2
[0037] Embodiment 2 On the basis of Embodiment 1, the positive input terminal of the comparator U3 is changed to be connected to the temperature collection point NTC-L, and the function of the temperature screening circuit in Embodiment 1 is also realized.
[0038] It should be noted that, as a secondary option, the positive input terminal of the comparator U3 can be changed to connect the temperature collection points NTC-R and NTC-L respectively, so that the temperature collection points NTC-R and NTC-L can control the comparison The output of the comparator U3, but this solution will cause the output level of the comparator U3 to jump quickly and increase the power consumption, so it can be selected according to actual needs.
Embodiment 3
[0040] Embodiment 3 On the basis of Embodiment 1, the NTC thermistor is used as a PCT thermistor instead, and the negative input terminal of the comparator U3 is changed to connect the PCT thermistor, and the positive input of the comparator U3 changed to the input reference voltage V REF , the function of the temperature screening circuit in Embodiment 1 is also realized.
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