Charge control circuit and laser instrument provided with same

Abstract

The invention provides a charge control circuit which comprises an input source, a charge management chip, a rechargeable battery and a load circuit, wherein a first end of the charge management chip is connected with a positive pole of the input source, a second end of the charge management chip is connected with a positive pole of the rechargeable battery and a first end of the load circuit, and a negative pole of the rechargeable battery and a second end of the load circuit are grounded; the charge control circuit also comprises a diode, a P-type MOS (Metal Oxide Semiconductor) transistor, a resistor R1 and a resistor R2; a positive pole of the diode is connected with that of the input source, a negative pole of the diode is connected with the first end of the load circuit, aand the P-type MOS transistor is connected between the second end of the charge management chip and the first end of the load circuit; a drain electrode D is connected with a second end of the charge management chip, a source electrode S is connected with the first end of the load circuit, a grid electrode G is connected with the positive pole of the input source by virtue of the resistor R1, and the grid electrode G and the negative pole of the rechargeable battery are grounded in parallel by virtue of the resistor R2. The invention also discloses a laser instrument provided with the charge control circuit.

Description

technical field [0001] The invention relates to a charging circuit, in particular to a charging control circuit capable of controlling battery charging. [0002] The invention also relates to a laser instrument with a charging control circuit. Background technique [0003] The charging management circuit in the prior art is only suitable for effectively charging the rechargeable battery BT when the instrument is turned off. However, when the instrument is turned on, because the rechargeable battery BT is connected in parallel with the load circuit, the charging control module cannot make correct detection of the cut-off voltage BAT+ of the rechargeable battery BT, resulting in the failure of the rechargeable battery BT to be fully charged. This defect has a certain impact on the cycle life of the rechargeable battery BT. At the same time, due to the insufficient capacity of the rechargeable battery BT, the working time of the laser instrument is shortened, which brings inco...

AI Technical Summary

Problems solved by technology

However, when the instrument is turned on and working, because the rechargeable battery BT is in parallel with the load circuit, the charging control module cannot make a correct detection of the cut-off voltage BAT+ of the rechargeable battery BT, resulting in the failure of the rechargeable battery BT to be fully charged.

This defect has a certain impact on the cycle life of the rechargeable battery BT. At the same time, due to the insufficient capacity of the rechargeable battery BT, the working time of the laser instrument is shortened, which brings inconvenience to the user.

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