CN205986261U - Cell -phone control circuit that charges - Google Patents

Abstract

The utility model discloses a cell -phone control circuit that charges, including emitting diode LED3, potentiometre RP1, comparator U1, comparator U2, key switch SB and triode VT1, the emitting diode LED3 positive pole VCC that connects respectively, potentiometre RP2 one end, resistance R3, resistance R4 and emitting diode LED2 are anodal, the emitting diode LED2 negative pole is connecting resistance R4 and triode VT2 collecting electrode respectively, it is anodal that ground connection battery E is connected respectively to triode VT2 projecting pole, resistance R2, triode VT1 projecting pole and key switch SB, comparator U2 inverting terminal is connected to the resistance R2 other end, potentiometre RP2 gleitbretter is connected to comparator U2 homophase end, potentiometre RP2 other end ground connection. The utility model discloses in the charging process, press the SB key at any time and just can get into the discharge condition, and will terminate discharging and change over to the charging process over to, as long as deenergization VCC, wait power indicator LED3 to extinguish the back, again switch on VCC can, helpful to the life who improves the battery.

Description

A kind of mobile phone charging control circuit

Technical field

This utility model is related to a kind of control circuit, specifically a kind of mobile phone charging control circuit.

Background technology

With the development of mobile Internet, mobile phone has become as requisite instrument in people's life.And battery skill Art does not still have very big breakthrough in today, and mobile phone charging problems just become emphasis of concern.Charging control circuit good The bad service life that can directly determine battery, existing charging control circuit is essentially all only charge function, without putting Electricity Functional, and present lithium battery, periodically carry out complete discharge and recharge to it, helpful to the service life improving battery.

Utility model content

The purpose of this utility model is to provide a kind of mobile phone charging control circuit of belt discharge function, to solve the above-mentioned back of the body The problem proposing in scape technology.

For achieving the above object, this utility model provides following technical scheme：

A kind of mobile phone charging control circuit, including LED 3, potentiometer RP1, comparator U1, comparator U2, Key switch SB and audion VT1, described LED 3 positive pole connects power supply VCC, potentiometer RP2 one end, electricity respectively Resistance R3, resistance R4 and LED 2 positive pole, LED 2 negative pole connects resistance R4 and audion VT2 collection respectively Electrode, audion VT2 emitter stage connects ground connection accumulator E positive pole, resistance R2, audion VT1 emitter stage and key switch respectively SB, the resistance R2 other end connects comparator U2 end of oppisite phase, and comparator U2 in-phase end connects potentiometer RP2 slide plate, and potentiometer RP2 is another One end is grounded, and comparator U2 outfan connects diode D2 negative pole, and diode D2 positive pole connects the resistance R3 other end, three poles respectively Pipe VT2 base stage and diode D1 positive pole, connecting triode VT1 base stage, resistance R7 and comparator U1 are defeated respectively for diode D1 negative pole Go out end, comparator U1 end of oppisite phase connects resistance R5, the resistance R5 other end connects resistance R6 respectively, the resistance R7 other end, button are opened Close the SB other end and audion VT1 colelctor electrode, resistance R6 other end connecting luminous diode LED1 positive pole, LED 1 Minus earth, described LED 3 negative pole connects potentiometer RP1 one end, and it is anti-that potentiometer RP1 slide plate connects comparator U1 Xiang Duan, the potentiometer RP1 other end is grounded.

As further program of the utility model：Described comparator U1 and comparator U2 is all using LM324.

As this utility model further scheme：Described audion VT1 is PNP triode.

Compared with prior art, the beneficial effects of the utility model are：This utility model, in charging process, is pressed at any time SB key just can enter discharge condition, and electric discharge to be terminated proceeds to charging process, as long as deenergization VCC, waits power supply indicator After LED3 extinguishes, then the VCC that switches on power, helpful to the service life improving battery.

Brief description

Fig. 1 is the circuit diagram of mobile phone charging control circuit.

Specific embodiment

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of making creative work The every other embodiment being obtained, broadly falls into the scope of this utility model protection.

Refer to Fig. 1, in this utility model embodiment, a kind of mobile phone charging control circuit, including LED 3, Potentiometer RP1, comparator U1, comparator U2, key switch SB and audion VT1, described LED 3 positive pole is respectively Connect power supply VCC, potentiometer RP2 one end, resistance R3, resistance R4 and LED 2 positive pole, LED 2 is negative Pole connects resistance R4 and audion VT2 colelctor electrode respectively, and audion VT2 emitter stage connects ground connection accumulator E positive pole, resistance respectively R2, audion VT1 emitter stage and key switch SB, the resistance R2 other end connects comparator U2 end of oppisite phase, comparator U2 in-phase end Connect potentiometer RP2 slide plate, the potentiometer RP2 other end is grounded, comparator U2 outfan connects diode D2 negative pole, diode D2 Positive pole connects the resistance R3 other end, audion VT2 base stage and diode D1 positive pole respectively, and diode D1 negative pole connects three poles respectively Pipe VT1 base stage, resistance R7 and comparator U1 outfan, comparator U1 end of oppisite phase connects resistance R5, and the resistance R5 other end connects respectively Connecting resistance R6, the resistance R7 other end, the key switch SB other end and audion VT1 colelctor electrode, the resistance R6 other end connects luminous Diode (LED) 1 positive pole, LED 1 minus earth, described LED 3 negative pole connects potentiometer RP1 mono- End, potentiometer RP1 slide plate connects comparator U1 end of oppisite phase, and the potentiometer RP1 other end is grounded；Described comparator U1 and comparator U2 All using LM324；Described audion VT1 is PNP triode.

Operation principle of the present utility model is：Refer to Fig. 1, after accessing accumulator E, click SB key, in access failure electricity During the VCC of source, U1 outfan is low level, then VT1 conducting, and LED1 is bright（This mode can check the discharge scenario of accumulator E）；Connect After the VCC of energising source, the in-phase end of U1 obtains a pulse voltage, so that comparator U1 is overturn, outfan exports high level, then VT1 Cut-off；The homophase terminal voltage of U2 is more than anti-phase terminal voltage value simultaneously, therefore U2 outfan also exports high level, therefore, by diode What D1, D2 formed exports high level with gate circuit, so that VT2 is turned on by the electric current that R3 introduces, and the voltage of power supply VCC output passes through R4 Charge to accumulator E, LED2 is lit（The power of its brightness, reflects the size of charging current）；Charging electricity when accumulator E After pressure reaches setting voltage, U2 overturns, and its outfan exports low level, and low level is also drawn in the b pole of VT2, then VT2 cut-off, LED2 extinguishes charging complete.

When needing electric discharge, SB key can be clicked, at this moment the anti-phase terminal voltage of U1 is equal to the voltage of accumulator E, and greatly In the voltage of in-phase input end, U1 upset outfan output low level, VT1 turns on, accumulator E is discharged by R7, now U1 End of oppisite phase also electric, decontrol SB key after, U1 outfan still exports low level, then VT2 ends while VT1 turns on immediately, When accumulator E voltage is put to certain value, U1 overturns, and outfan exports high level, also exports high level with door, so that VT1 is cut Only, VT2 conducting, accumulator E just proceeds to charged state by electric discharge, and later process is just the same with the independent process charging, here No longer describe.

In sum, this utility model, in charging process, is pressed SB key at any time and just can be entered discharge condition, and will terminate Electric discharge proceeds to charging process, as long as deenergization VCC, after waiting power supply indicator LED3 to extinguish, then the VCC that switches on power.

Claims (3)

1. a kind of mobile phone charging control circuit, including LED 3, potentiometer RP1, comparator U1, comparator U2, presses Key switch SB and audion VT1 is it is characterised in that described LED 3 positive pole connects power supply VCC, potentiometer respectively RP2 one end, resistance R3, resistance R4 and LED 2 positive pole, LED 2 negative pole connect respectively resistance R4 and Audion VT2 colelctor electrode, audion VT2 emitter stage connects ground connection accumulator E positive pole, resistance R2, audion VT1 emitter stage respectively With key switch SB, resistance R2 other end connection comparator U2 end of oppisite phase, comparator U2 in-phase end connects potentiometer RP2 slide plate, The potentiometer RP2 other end is grounded, and comparator U2 outfan connects diode D2 negative pole, and diode D2 positive pole connects resistance R3 respectively The other end, audion VT2 base stage and diode D1 positive pole, diode D1 negative pole respectively connecting triode VT1 base stage, resistance R7 and Comparator U1 outfan, comparator U1 end of oppisite phase connects resistance R5, and it is another that the resistance R5 other end connects resistance R6, resistance R7 respectively End, the key switch SB other end and audion VT1 colelctor electrode, resistance R6 other end connecting luminous diode LED1 positive pole, light Diode (LED) 1 minus earth, described LED 3 negative pole connects potentiometer RP1 one end, and potentiometer RP1 slide plate connects Comparator U1 end of oppisite phase, the potentiometer RP1 other end is grounded.

2. mobile phone charging control circuit according to claim 1 is it is characterised in that described comparator U1 and comparator U2 is equal Using LM324.

3. mobile phone charging control circuit according to claim 1 is it is characterised in that described audion VT1 is PNP tri- pole Pipe.