Indicating lamp control circuit for electric facilities, and mobile phone

Abstract

The invention provides an indicating lamp control circuit for electric facilities, which comprises a luminous indicating element, a first triode, a triode, a third triode and a fourth triode as well as a related current-limiting and voltage-limiting resistor and a filter capacitor; the negative pole of the luminous indicating element is connected with a collector electrode of the first triode; the base electrode of the first triode is connected with the collector electrode of the second triode; the base electrode of the fourth triode is connected with the collector electrode of the third triode; the base electrode of the second triode is connected with a first input / output interface of an electric facility controller; and the base electrode of the third triode is connected with a second input / output interface of the electric facility controller. A control system controls the on / off of the triodes through controlling the state of high and low level output from the first input / output interface and the second input / output interface, so that the on / off and the current of the luminous indicating element can be controlled orderly. The invention further provides a mobile phone provided with the indicating lamp control circuit for electric facilities.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an indicator light control circuit of electrical equipment. The invention also relates to a mobile phone equipped with the indicator light control circuit. Background technique [0002] In the current design of electronic appliances, the designer will equip the product with a charging indicator light according to the needs of the user to remind the user that the electrical appliance is in the charging state, especially in the charging of mobile phones. When the battery voltage of the mobile phone is very low, the mobile phone cannot When the phone is turned on, that is, when the mobile phone is pre-charging, the setting of the charging indicator is especially necessary. In order to realize the function of the charging indicator light or breathing light (the light gradually changes from bright to dark) in the mobile phone circuit in the current technology, it is gene...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide a control circuit for indicator lamps of electrical equipment, which aims to solve the problem that the traditional MOSFET (metal-oxide layer-semiconductor-field effect transistor) tube circuit is complicated, the cost is high, and the current of the light-emitting indicating element is not easy. problem of control

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