Physiological signal detection device

摘要

A physiological signal detection device has a battery disposed in the physiological signal detection device, a first input terminal, a second input terminal, and a charging detection terminal A physiological signal detection circuit generates a physiological signal according to a detection result of the first input terminal and the second input terminal A charging control circuit is electrically coupled to the first input terminal, the second input terminal and the charging detection terminal, wherein, when the first input terminal and the second input terminal are coupled to a power supply supplied by a charging device, the charging detection terminal receives a charging indication signal of the charging device and according to the charging indication signal the charging device is enabled so as to charge the battery with the power supply.

主权项

1. A physiological signal detection device, comprising:
a battery, disposed in the physiological signal detection device, comprising a positive terminal and a negative terminal; a first input terminal; a second input terminal; a charging detection terminal, for receiving a charging indication signal from a charging device; a physiological signal detection circuit, electrically coupled to the first input terminal and the second input terminal, wherein, when the first input terminal and the second input terminal are electrically connected to a measure target, the physiological signal detection circuit generates a physiological signal according to a detection result of the first input terminal and the second input terminal; and a charging control circuit, electrically coupled to the first input terminal, the second input terminal and the charging detection terminal, wherein, when the first input terminal and the second input terminal are coupled to a power supply supplied by the charging device, the charging detection terminal receives the charging indication signal of the charging device and according to the charging indication signal the charging control circuit is enabled so as to charge the battery with the power supply, wherein: the charging control circuit further comprises a first resistor coupling the charging detection terminal to a power terminal of the charging control circuit; when the first input terminal, the second input terminal and the charging detection terminal are coupled to the charging device but the charging device is not supplying the power supply, the first resistor and internal resistors within the charging device and coupled to the charging detection terminal form a voltage divider that divides a voltage at the power terminal of the charging control circuit to generate a divided voltage at the charging detection terminal for recognizing that the physiological signal detection device is operated in a storage mode; the charging control circuit further comprises a second resistor coupled between the charging detection terminal and a ground terminal; the charging device comprises a third resistor and a fourth resistor to be coupled in series between the charging detection terminal and a ground terminal; and the charging device further comprises a diode having an anode coupled to a connection node between the third resistor and the fourth resistor and having a cathode to be coupled to the first input terminal.