CN206498207U

CN206498207U - Protection circuit

Info

Publication number: CN206498207U
Application number: CN201621201958.8U
Authority: CN
Inventors: 谢乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-11-08
Filing date: 2016-11-08
Publication date: 2017-09-15
Anticipated expiration: 2026-11-08

Abstract

This circuit is related to a kind of protection circuit.The protection circuit can protect mobile phone, camera, tablet personal computer; the electronic equipments such as notebook cut off power supply in the case of water inlet, and this circuit detects circuit, battery power switch control circuit by the water inlet for including absorbent material; charge switch controlling circuits, three parts composition.Equipment to water inlet can play a very good protection, and make to become simple into the maintenance after water, the probability fixed is uprised, and is preferably minimized the loss of user.

Description

Protection circuit

Technical field

This circuit is related to a kind of protection circuit.The protection circuit can protect mobile phone, camera, tablet personal computer, notebook Power supply is cut off in the case of water inlet Deng electronic equipment, this circuit detects circuit by the water inlet for including absorbent material, battery is supplied Electric switch controls circuit, charge switch controlling circuits, three parts composition.

Background technology

Current phone, camera, tablet personal computer, notebook waits the electronic equipment carried with increasingly to popularize, one in life Imprudence allows these electronic equipments to fall into water or oozed water, because water is conductive, adds this class of electronic devices typically interior Put battery, it is non-dismountable, and or party do not recognize at once power-off necessity, often find product it is abnormal when Circuit has damaged very serious, and the possibility of reparation is very small, and the difficulty of reparation is very big, causes mainboard to corrode, electric leakage, oxygen Change the problem of even short circuit etc. is complicated to occur, the damage for causing electronic product is uncontrollable and irreversible.Not only electronics Product can not be repaired and the related important information of storage also is difficult to be transferred out inside electronic product, to the loss of party very Greatly.The present invention can directly be powered off in the very first time of water inlet from the feeder ear of battery, it is to avoid allow circuit etch, be aoxidized, electric leakage The possibility burnt.Because commonly used person in electronic equipment water inlet normally can not may think that electronic equipment in the case of use Battery not only disconnects battery-end without electricity, the hazardous act charged, the protection circuit while detecting into water Power supply, and disconnect charging end supply input.The electronic equipment made into water is in the state of unpowered, allows the damage of circuit to drop To minimum, and then repair also simple, easily, allow the loss of user to be preferably minimized.

The content of the invention

Therefore, the circuit of power-off protection can be played in the case of water inlet it is an object of the invention to provide a kind of.

The protection circuit is made up of three partial circuits：First battery input switch control section H7.Second charge switch Control section H7.3rd water inlet detection control section H9.Battery input switch control section H7 is connected on battery and by protection electricity Between road, and it is connected with water inlet detection part.Charge switch control section is connected between charging input end and charging circuit, And it is connected with battery input switch control section output end.

Q2 used in the protection circuit, Q4, Q5 is NPN triode.Q1, Q3 are N-channel type FET.

Brief description of the drawings

Fig. 1 is protection circuit schematic diagram of the present utility model.

Embodiment

The protection circuit schematic diagram described in accompanying drawing 1 is referred to, operation principle is as follows in the state of circuit does not have water inlet normal： Cell input terminal respectively with R1, a R11 pin is connected, and is connected with Q1 S pin, and R11 another pin is connected with Q1 G pin, makes The voltage of Q1 G pin is high level, and Q1 S pin and D pin are in not on-state, Q1 D pin Non voltage outputs, R1 another pin Be connected with G points, K points and R4, R7, R2, a pin be connected and be connected with Q5 C pin, the R1 when G points and short with the conductor touching of K points The high level of output, to Q2 B pin, makes Q2 C pin and the conducting of E pin, because Q2 E pin are connected to the ground, in Q2 by R2 another pin In the case of conducting, Q2 C pin are equivalent to short circuit over the ground, and the R3 being connected with Q2 C pin is connected by another pin with Q1 G pin, And then Q1 G pin voltage pull-downs into low level, and then making Q1 S pin and the conducting of D pin, D pin now have cell voltage output.R4 A pin be connected with Q1 D pin, R4 another pin is connected with a R2 pin, and R2 another pin is connected with Q2 B pin, so in G In the case that point and K points are in disconnection, Q2 base stage B is also high level, and Q2 conducting is maintained, and then makes turning on for Q1 To maintain, even if therefore cell voltage importation is able to normally in the case where G points and K points are disconnected.

Because of Q1 conductings, the R10 being connected with Q1 D pin another pin respectively with R8, a R9 pin is connected, R8 another pin and Ground is connected, and R9 another pin is connected with Q4 B pin, is connected by R8 with Q4 B pin, Q4 B pin is in high level, and then Make Q4 C pin and the conducting of E pin, Q4 E pin are connected to the ground, and Q4 C pin are connected with a R6 pin, R6 another pin and Q3 G pin It is connected, and then is low level Q3 G pin voltage pull-down, makes Q3 in the conduction state, Q3 S pin and charging input end VIN phases Even, when inserting charger, Q3 S pin and D pin conducting output charging voltage can be charged normal.

Detection part H2 of intaking is made up of L1, L2 and S, and this detection part is arranged at the position easily intake, this test section H2 is divided to set multiple in multiple positions in parallel as needed, L1 is parallel adjacent disjunct wire with L2, and S is to be bonded at circuit On plate and the water-absorbing material of W area that is covered between L1 and L2, when water is penetrated into circuit, because S has water imbibition, this When water of the absorption on S serve as L1 and L2 electric conductor, and L2 is connected with Q1 D pin, makes L2 voltage by the conduction of water Property make L1 be high level, a R12 pin another pin that is connected with L1 is connected with Q5 B pin, and then turns on Q5 C pin and E pin, because Q5 E pin are connected to the ground, and then make it that the Q2 B pin being connected with R2 are low level, are not turned on Q2 C pin and E pin, and then make Q1 control pin G keeps high level, Q1 S pin and D pin is in the state being not turned on, and then Q1 D pin do not have voltage output, Now electronic equipment is in unpowered state, because of Q1 D pin Non voltage outputs, the R10 being attached thereto also no-voltages, and then make to lead to The base stage B for crossing the Q4 that R9 is attached thereto is low level, and Q4 C pin and E pin are in not on-state, now when charger is inserted Also it is high level, and then make Q3 S pin and D pin with the charging input end VIN R5 being connected another pin and Q3 G pin connected end It is not turned on, Q3 D pin are exported without charging voltage.

After the absorbent material S water absorbed has been done, although being due to this without water as conductor between L1 and L2 When Q1 S pin and D pin be in not on-state, Q1 D pin do not have voltage, L1, and L2 has been low level, and Q2 B pin are low Level, in not on-state, it is impossible to which, Q1 G pin down for low level, Q1 D pin are still no voltage output, only Again tactile power supply and charging circuit normal work again can just be made G points and K points are short with electric conductor.

The whole circuit, it is all remaining in other circuits outside L2 and S absorbent materials overlay area except L1 Part sealing water-proofing treatment, causes the protection circuit can not normal work with water-inlet-proof.

Normal condition：G point K points are short to be touched, and --- --- --- -- Q4 conductings ----Q3 is turned on for-Q1 conductings for-Q2 conductings

Flooded condition：When S is adsorbed onto water, --- ----Q2 is not turned on, and --- Q1 is not turned on --- -- Q4 and not led for-Q5 conductings It is logical ----Q3 is not turned on.

Claims

1. a kind of protection circuit, it is characterised in that：Described protection circuit is made up of three parts, and Part I includes water imbibition material The water inlet detection part H2 of material, Part II battery input switch control circuit H7, Part III charge switch controlling circuits H9, Described water inlet detection part H2 is connected with battery input switch part H7, and battery input switch control section H7 output ends are with filling Electric switch control circuit H9 is connected, and the water inlet detection part H2 of the water-absorbing material can instruct protection electricity after circuit is intake Road disconnects cell input terminal and powered, and disconnects charging input end and powers, once entering in guard mode is disconnected, power supply can be maintained always Off-state.

2. a kind of protection circuit according to claim 1, it is characterised in that：The water inlet detection part can be according to reality Need to be arranged in parallel multiple, be arranged at the position easily intake.