CN206948005U - The portable lithium battery power supply device of recording instrument without paper - Google Patents

Abstract

The utility model discloses a kind of portable lithium battery power supply device of recording instrument without paper; including housing, lithium battery charging circuit, lithium battery protection circuit, lithium battery management circuit and AC/DC power-switching circuits; the lithium battery charging circuit, lithium battery protection circuit, lithium battery management circuit, AC/DC power-switching circuits are separately positioned in the housing and electrical communication successively, the AC/DC power-switching circuits and external recording instrument without paper electrical communication；By the lithium battery power supply circuit of the whole series, realize and quickly and easily provide power supply to recorder, it is low in energy consumption, charging is repeated, while power supply circuit carries protection and management function, power supply is safer and efficient.

Description

The portable lithium battery power supply device of recording instrument without paper

Technical field

The utility model belongs to the power supply field of recording instrument without paper, more particularly to a kind of for the portable of recording instrument without paper Lithium battery power supply device.

Background technology

Recording instrument without paper is in fields such as industry, agriculturals using widely, and used recording instrument without paper is all base at present Need to be fixed on workplace in the place for having city's electricity output, installation, this traditional recording instrument without paper disclosure satisfy that some The requirement of occasion, but in actual industrial, agricultural production, many fields of employment are that do not possess city's electricity output, Er Qieshi It is not fixed on a position to use, traditional recording instrument without paper can not meet these requirements, if one kind need not City's electricity output, mobile portable recorder, above mentioned problem can solve, and what this new recorder primarily solved is exactly it The electric supply installation of power supply, while need electric supply installation low in energy consumption, repeatable charging, easy to use etc., current power supply power supply dress Put and be unable to reach this point.

Utility model content

The utility model provides the portable lithium battery power supply device of recording instrument without paper, low in energy consumption, repeatable charging, uses It is convenient.

The utility model adopts the following technical scheme that：

The utility model provides a kind of portable lithium battery power supply device of recording instrument without paper, including housing, lithium battery fill Circuit, lithium battery protection circuit, lithium battery management circuit and AC/DC power-switching circuits, the lithium battery charging circuit, lithium Battery protecting circuit, lithium battery management circuit, AC/DC power-switching circuits are separately positioned in the housing and electrically connected successively It is logical, the AC/DC power-switching circuits and external recording instrument without paper electrical communication.

Preferably, the lithium battery charging circuit includes CN3065 charging chips, the CN3065 charging chips CHRG pin connecting luminous diodes D₃, resistance R is connected between ISET pins and EGND₁₃It is determined that DONE pins connection luminous two Pole pipe D2.

Preferably, the lithium battery protection circuit includes S-8261 chips, the lithium battery protection circuit EB- ends with The EB- ends of the lithium battery charging circuit are connected, while are connected with the EGND of the lithium battery charging circuit.

Preferably, lithium battery management circuit includes MIC79050 chips and two hysteresis comparators.

The beneficial effects of the utility model are：By the lithium battery power supply circuit of the whole series, realize quickly and easily to note Record instrument provide power supply, it is low in energy consumption, repeat charging, while power supply circuit carry protection and management function, power supply it is safer and Efficiently.

Brief description of the drawings

Fig. 1 is a kind of block circuit structural representation of embodiment of the utility model；

Fig. 2 is the circuit theory diagrams of lithium battery charging circuit in Fig. 1；

Fig. 3 is the circuit theory diagrams of lithium battery protection circuit in Fig. 1；

Fig. 4 is the circuit theory diagrams of lithium battery management circuit in Fig. 1.

Embodiment

Describe preferred embodiment of the present utility model in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, a kind of portable lithium battery power supply device of recording instrument without paper, including housing 1, lithium cell charging electricity Road 2, lithium battery protection circuit 3, lithium battery management circuit 4 and AC/DC power-switching circuits 5, the lithium battery charging circuit 2, Lithium battery protection circuit 3, lithium battery management circuit 4, AC/DC power-switching circuits 5 are separately positioned in the housing 1 and successively Electrical communication, the AC/DC power-switching circuits 5 and external recording instrument without paper electrical communication.

As shown in Fig. 2 the core parts of the lithium battery charging circuit 2 of the present embodiment are CN3065 charging chips, charging electricity Road selects 4.2V constant-voltage charges.When input voltage is more than low voltage test threshold value and battery terminal voltage, CN3065 starts to electricity Pond is charged, and CHRG pins output low level, represents that charging is carried out, while red light emitting diodes D₃It is bright；If battery is electric The voltage of pressure detection input (FB) is less than 3V, and charger low current enters line precharge to battery；When battery voltage detection is defeated When entering the voltage at end (FB) more than 3V, charger is charged using cross-flow mode to battery.Charging current I_SETBy ISET pins and Resistance R between EGND pins₁₃It is determined that I_SET=1800/R₁₃, I_SETUnit is ampere, R₁₃Unit of resistance is ohm, this implementation Example charging stream is 900mA, so resistance R₁₃Value be 2000 Ω.When the close electricity of the voltage of battery voltage detection input (FB) During the modulation voltage of pond end, charging current is gradually reduced, and CN3065 enters constant-voltage charge pattern.When input voltage is more than 4.45V, and And charging current is reduced to when charging end threshold value, charge cycle terminates, CHRG pins output high level, and the output of DONE pins is low Level, red light emitting diodes D3 go out, and green LED D2 is bright.When input voltage power down or input voltage are less than battery During voltage, electrical equipment enters the sleep pattern of low-power consumption.In addition, earth terminal is that EGND allows for follow-up lithium battery guarantor in Fig. 2 Protection circuit 3, install lithium battery protection circuit 3 additional on the basis of lithium battery charging circuit 2, further ensure that the unlikely mistake of lithium battery Charging, overdischarge and damage.

As shown in figure 3, lithium battery protection circuit 3 includes S-8261 chips, its built-in high-accuracy voltage detects circuit and prolonged Slow circuit, is the protection IC for lithium ion, lighium polymer rechargeable battery, and the IC is best suited for lithium ion or lighium polymer Overcharge, overdischarge and the overcurrent protection of battery.S-8261 effect is the electricity being connected to by monitoring between VDD and VSS Voltage difference between cell voltage and VM-VSS and control charging and discharging.Cell voltage is more than overdischarge detection voltage and is overcharging Below electro-detection voltage, the voltage of VM pins detects more than voltage and in the case where overcurrent is detected below voltage in charging, (the present embodiment charging FET and the integrated mould of electric discharge FET selections are opened in the FET of charge control and the FET both ends of electric discharge Block 8205A), at this moment can freely it be charged and discharged.Under battery discharge status, due to discharge current rated value with On, the voltage of VM pins is more than overcurrent detection voltage, and this state continues in overcurrent detection more than time delay Occasion, close control of discharge and stop discharging with FET.This state is called overcurrent condition.Cell voltage exceeded in charging Charging detection voltage, is maintained at when it is more than time delay to overcharge electro-detection, charge closing FET, stops charging, this state Overcharge condition.If usual cell voltage is detected under voltage in electric discharge in overdischarge, and keeps this state to exist When overdischarge detection is more than time delay, control of discharge FET will be closed, stop electric discharge, this state is over-discharge state.Should Charge-discharge protection circuit can also carry out the detection of charger and the detection of abnormal charging current.In Fig. 3 EB- be with Fig. 2 EB- is connected, while is connected with EGND in Fig. 2, plays charge and discharge protecting effect.Resistance R in circuit₁At least 300 Ω, this reality Apply and 470 Ω are used in example；Electric capacity between VDD and VSS is if less than 0.022 μ F, and when load short circuits detect, DO is possible to send out Raw vibration, so electric capacity C₁0.022 μ F must be more than, design the representative value that 0.1 μ F are used in circuit；It is inverse for control charger Electric current is flowed through during connection, larger resistance value should be chosen as far as possible, 2k Ω are chosen in the present embodiment.

As shown in figure 4, lithium battery management circuit 4 from MIC79050 chips as main chip, output voltage 4.2V, With current limliting and overheat turn-off function, it may be achieved to the constant voltage constant current charging of lithium battery.Two hysteresis comparator circuits are respectively used to The working condition of two pieces of batteries is detected, the charging that its output end acts on MIC79050 chips enables control terminal, control chip Cut-off, gate control circuit detects the output state of two hysteresis comparators, and passes through Automatic level control Q₃、Q₄、Q₅、Q₆Cut-off State, adjustment switching lithium battery working condition, K are that discharge and recharge gates level, K₁Level is detected for line current, is supplied in transformer When can be insufficient, pass through K₁Control Q₈Turn off charging circuit, the power demands of preferential proof load；K₂For preliminary filling electric control level, When lithium battery voltage is less than safe voltage (setting 3.3V), Q₈Cut-off, the precharged resistance R chargings of charging current.Lithium battery management The moment of circuit 4 detects the voltage of battery, supplements the energy content of battery in time, advantageously ensures that battery reliably discharges, and improves energy profit With efficiency and battery.

The electric supply installation of the application, electric energy is full of to electric supply installation by lithium battery charging circuit 2, in charging, passed through Lithium battery protection circuit 3 can prevent lithium battery from overcharging, while can also prevent electric supply installation from giving recording instrument without paper over-discharge, lithium electricity Pond management circuit 4 can be to being charged and discharged under-voltage management in real time and overheating detection, and AC/DC power-switching circuits 5 are to being saved in lithium Electric energy in battery is changed, and the electric energy after conversion is available for recording instrument without paper directly to use, and passes through a whole set of lithium battery power supply electricity Road, realize and quickly and easily provide power supply to recorder, it is low in energy consumption, charging is repeated, while power supply circuit carries protection and pipe Function is managed, power supply is safer and efficient, and traditional recording instrument without paper is required for city's electricity output to work, many outdoor Place is that do not possess city's electricity output, thus brings significant limitation to recording instrument without paper use, and use is very inconvenient, is led to Cross the lithium battery power supply device that this patent is provided, you can perfectly solve this problem.

Above-described embodiment and schema and non-limiting product form of the present utility model and style, any art The appropriate change or modification that those of ordinary skill is done to it, all should be regarded as not departing from patent category of the present utility model.

Claims (4)

1. A kind of 1. portable lithium battery power supply device of recording instrument without paper, it is characterised in that：Including housing (1), lithium cell charging Circuit (2), lithium battery protection circuit (3), lithium battery management circuit (4) and AC/DC power-switching circuits (5), the lithium battery Charging circuit (2), lithium battery protection circuit (3), lithium battery management circuit (4), AC/DC power-switching circuits (5) are set respectively In the housing (1) and electrical communication, the AC/DC power-switching circuits (5) electrically connect with external recording instrument without paper successively It is logical.
2. A kind of 2. portable lithium battery power supply device of recording instrument without paper according to claim 1, it is characterised in that：It is described Lithium battery charging circuit (2) includes CN3065 charging chips, the CHRG pins connection light-emitting diodes of the CN3065 charging chips Pipe D₃, resistance R is connected between ISET pins and EGND₁₃It is determined that DONE pin connecting luminous diodes D2.
3. A kind of 3. portable lithium battery power supply device of recording instrument without paper according to claim 2, it is characterised in that：It is described Lithium battery protection circuit (3) includes S-8261 chips, lithium battery protection circuit (3) the EB- ends and lithium cell charging electricity The EB- ends on road (2) are connected, while are connected with the EGND of the lithium battery charging circuit (2).
4. A kind of 4. portable lithium battery power supply device of recording instrument without paper according to claim 2, it is characterised in that：Lithium electricity Pond management circuit (4) includes MIC79050 chips and two hysteresis comparators.