CN209233544U

CN209233544U - A kind of charger for lithium ion battery

Info

Publication number: CN209233544U
Application number: CN201920199313.2U
Authority: CN
Inventors: 郑冰
Original assignee: Guangzhou Huicai Tuozhou Education Consulting Service Co Ltd
Current assignee: Guangzhou Huicai Tuozhou Education Consulting Service Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2019-08-09
Anticipated expiration: 2029-02-15

Abstract

The utility model discloses a kind of charger for lithium ion battery, including the charging module for being direct current by AC conversion and carrying out the power module of voltage regulation filtering, carrying out automatic conversion control to constant pressure and flow and have the control module of instruction function and charge to lithium battery；The power module is respectively the control module, charging module for power supply；The control module controls the constant voltage constant current charging mode of the charging module；The utility model uses constant current charging method when battery terminal voltage is lower than 4.2V; and constant pressure low current (60mA) charging modes can be switched to automatically when battery terminal voltage is charged to 4.2V; it can be realized constant-current charge/constant-voltage charge auto-conversion function, that protects battery overcharges floating charge.

Description

A kind of charger for lithium ion battery

Technical field

The utility model relates to arrive lithium battery charging technique field more particularly to a kind of charger for lithium ion battery.

Background technique

Charger for lithium ion battery is the charger for being specifically used to charge for lithium ion battery, and lithium ion battery is to charger It is more demanding, can to lithium ion battery carry out constant current/constant voltage charging.

Current charger for lithium ion battery mostly uses greatly one of constant current/constant voltage as circuit topological structure, is easy Damage service life is overcharged to lithium battery or cruise duration is shortened in floating charge.

Therefore, the prior art is defective, needs to improve.

Utility model content

The utility model provides a kind of charger for lithium ion battery, the above problem of solution.

To solve the above problems, the technical scheme that the utility model is provided is as follows:

A kind of charger for lithium ion battery, including being direct current and the power supply mould for carrying out voltage regulation filtering by AC conversion Block, the control module that automatic conversion control is carried out to constant pressure and flow and there is instruction function and the charging charged to lithium battery Module；The power module is respectively the control module, charging module for power supply；The control module controls the charging module Constant voltage constant current charging mode.

Beneficial effect compared with the existing technology is that using the above scheme, the utility model is lower than when battery terminal voltage Constant current charging method is used when 4.2V, and can switch to constant pressure low current (60mA) charging automatically when battery terminal voltage is charged to 4.2V Mode, can be realized constant-current charge/constant-voltage charge auto-conversion function, and that protects battery overcharges floating charge.

Detailed description of the invention

Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only the one of utility model A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these Attached drawing obtains other attached drawings.

Fig. 1 is a kind of charger for lithium ion battery circuit diagram of the utility model.

Specific embodiment

For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this The understanding of the disclosure of utility model is more thorough and comprehensive.

It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ", For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement Mark.

Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.

As shown in Figure 1, one embodiment of the utility model is:

The power module includes power supply switch S, transformer T, rectifier bridge stack UR, filter capacitor C1, C2 and integrated electricity Road IC1；

The end L of alternating current is connect with the first end of the switch S；The second end of the switch S and the transformer T primary line The first end of circle connects；The N-terminal of alternating current is connect with the second end of the transformer T primary coil；The transformer T secondary coil It is connect with the ac input end of the rectifier bridge stack UR；The cathode of the rectifier bridge stack UR is grounded；The rectifier bridge stack UR is just Pole is connect with the 1st pin of the first end of the capacitor C1, the Integrated circuit IC 1 respectively；The 3rd of the Integrated circuit IC 1 Pin is connect with the first end of the capacitor C2；2nd pin of the Integrated circuit IC 1, the second end of described capacitor C1, C2 are equal Ground connection；

The transformer T is power transformer；The Integrated circuit IC 1 is three end integrated voltage-stabilized integrated circuits.

The control module includes Integrated circuit IC 2, potentiometer RP1, resistance R1, R5~R8, capacitor C3, C4, transistor V1, V2, relay K and light emitting diode VL1, VL2；

The first end of the capacitor C1 is connect with the first end of the resistance R6；The first end of the capacitor C2 and the electricity The first end connection of position device RP1；

The second end of the potentiometer RP1 is grounded；The sliding end of the potentiometer RP1 respectively with the Integrated circuit IC 2 The 4th, 8 pins connection；The first end of the potentiometer RP1 is connect with the first end of the resistance R1；The of the resistance R1 Two ends are connect with the 2nd pin of the first end of the capacitor C3, the Integrated circuit IC 2 respectively；The of the Integrated circuit IC 2 5 pins are connect with the first end of the capacitor C4；1st pin of the second end of described capacitor C3, C4, the Integrated circuit IC 2 It is grounded；3rd pin of the Integrated circuit IC 2 is connect by the resistance R5 with the base stage of the transistor V1；The electricity The first end of resistance R6 is connect with the first end of the first end of the resistance R7, the relay K respectively；The second of the resistance R6 End is connect with the base stage of the collector of the transistor V1, the transistor V2 respectively；The collector of the transistor V2 is distinguished It is connect with the cathode of the second end of the relay K, the first end of the resistance R8, the light emitting diode VL1；The resistance The second end of R7 is connect with the anode of the light emitting diode VL1；The second end of the resistance R8 and the light emitting diode VL2 Anode connection；The emitter of described transistor V1, V2, the light emitting diode VL2 cathode be grounded；

The light emitting diode VL1 is red constant-voltage charge indicator light；The light emitting diode VL2 is the constant current of green Charging indicator light；The Integrated circuit IC 2 is time-base integrated circuit.

The charging module includes diode VD, Integrated circuit IC 3, resistance R2~R4, potentiometer RP2 and battery GB；

The first end of the resistance R2 is connect with the 6th pin of the Integrated circuit IC 2；The first end of the resistance R1 with The anode connection of the diode VD；

The cathode of the diode VD is connect with the 3rd pin of the Integrated circuit IC 3；The 2nd of the Integrated circuit IC 3 Pin is connect with the first end of the resistance R3；1st pin of the Integrated circuit IC 3 respectively with the resistance R4 first It holds, the connection of the 2nd end of the change-over switch of relay K；1st end of the change-over switch of relay K is respectively with the potentiometer RP2's First end, sliding end connection；The second end of the potentiometer RP2 is grounded；The second end of the resistance R2 respectively with the resistance The anode connection of the second end of R3-R4, the 3rd end of the change-over switch of relay K, the battery GB；The cathode of the battery GB Ground connection；

The battery GB is rechargeable lithium ion batteries；The Integrated circuit IC 3 is the adjustable integrated regulator in three ends.

Working principle of the utility model is:

After powering on, alternating current 220V voltage is depressured, after UR rectification, C1 filtering and IC1 pressure stabilizing through T, is generated at the both ends C2 12V DC voltage.The voltage is divided into three tunnels: all the way after RP1 decompression adjustment, providing operating voltage (VCC) for IC2；It passes through all the way VD adds to 3 feet (voltage input end) of IC3, the input voltage as charging circuit；Another way charges to C3 through R1.V1, V2 and K Working power be derived from UR rectification after DC voltage.

When being just switched on power supply, since C3 both end voltage cannot be mutated, the 2 foot voltages of IC2 are lower than VCC/3, the touching inside IC2 Device set is sent out, 3 feet export high level, make V1 saturation conduction, V2 cut-off, and K cannot be attracted, and normally closed interlock is connected, R4 is shorted, Charging circuit is to battery GB constant-current charge.VL2 is lighted at this time, and instruction charger is in constant-current charge state.

When cell voltage is charged to 4.2V, the 6 foot voltages of IC2 reach 2VCC/3 threshold level, and the trigger inside IC2 is multiple Position, 3 feet become low level from high level, end V1, V2 saturation conduction, and K is attracted, and normally closed interlock disconnects, and normally open contact connects Logical, charging circuit is changed to constant voltage charging method by constant current charging method, carries out constant-voltage charge to GB.Charging current is 60mA left The right side, and be gradually reduced as charging progresses, when charging current is reduced to 20mA or so, charging terminates.

It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed, It is accordingly to be regarded as the range of the utility model specification record；Also, it for those of ordinary skills, can be according to above stating It is bright to be improved or converted, and all these modifications and variations all should belong to the protection model of the appended claims for the utility model It encloses.

Claims

1. a kind of charger for lithium ion battery, which is characterized in that including being direct current by AC conversion and carrying out voltage regulation filtering Power module, to constant pressure and flow carry out automatic conversion control and have instruction function control module and lithium battery is filled The charging module of electricity；The power module is respectively the control module, charging module for power supply；Described in the control module control The constant voltage constant current charging mode of charging module.

2. a kind of charger for lithium ion battery according to claim 1, which is characterized in that the power module includes power supply With switch S, transformer T, rectifier bridge stack UR, filter capacitor C1, C2 and Integrated circuit IC 1.

3. a kind of charger for lithium ion battery according to claim 2, which is characterized in that the end L of alternating current and the switch S First end connection；The second end of the switch S is connect with the first end of the transformer T primary coil；The N-terminal of alternating current and institute State the second end connection of transformer T primary coil；The ac input end of the transformer T secondary coil and the rectifier bridge stack UR Connection；The cathode of the rectifier bridge stack UR is grounded；The rectifier bridge stack UR anode respectively with the first end of the capacitor C1, institute State the 1st pin connection of Integrated circuit IC 1；3rd pin of the Integrated circuit IC 1 is connect with the first end of the capacitor C2； 2nd pin of the Integrated circuit IC 1, the second end of described capacitor C1, C2 are grounded.

4. a kind of charger for lithium ion battery according to claim 2 or 3, which is characterized in that the transformer T is electricity Source transformer；The Integrated circuit IC 1 is three end integrated voltage-stabilized integrated circuits.

5. a kind of charger for lithium ion battery according to claim 1, which is characterized in that the control module includes integrated IC circuit 2, potentiometer RP1, resistance R1, R5~R8, capacitor C3, C4, transistor V1, V2, relay K and light emitting diode VL1, VL2。

6. a kind of charger for lithium ion battery according to claim 5, which is characterized in that the second of the potentiometer RP1 End ground connection；The sliding end of the potentiometer RP1 is connect with the 4th of the Integrated circuit IC 2,8 pins respectively；The potentiometer The first end of RP1 is connect with the first end of the resistance R1；The second end of the resistance R1 respectively with the capacitor C3 first The 2nd pin connection at end, the Integrated circuit IC 2；5th pin of the Integrated circuit IC 2 and the first end of the capacitor C4 Connection；The second end of described capacitor C3, C4, the 1st pin of the Integrated circuit IC 2 are grounded；The of the Integrated circuit IC 2 3 pins are connect by the resistance R5 with the base stage of the transistor V1；The first end of the resistance R6 respectively with the resistance The first end of R7, the connection of the first end of the relay K；The second end of the resistance R6 current collection with the transistor V1 respectively The base stage connection of pole, the transistor V2；The collector of the transistor V2 respectively with the second end of the relay K, described The cathode connection of the first end of resistance R8, the light emitting diode VL1；The second end of the resistance R7 and the light emitting diode The anode connection of VL1；The second end of the resistance R8 is connect with the anode of the light emitting diode VL2；Described transistor V1, V2 Emitter, the light emitting diode VL2 cathode be grounded.

7. a kind of charger for lithium ion battery according to claim 5 or 6, which is characterized in that the light emitting diode VL1 is red constant-voltage charge indicator light；The light emitting diode VL2 is the constant-current charge indicator light of green；The integrated electricity Road IC2 is time-base integrated circuit.

8. a kind of charger for lithium ion battery according to claim 1, which is characterized in that the charging module includes two poles Pipe VD, Integrated circuit IC 3, resistance R2~R4, potentiometer RP2 and battery GB.

9. a kind of charger for lithium ion battery according to claim 8, which is characterized in that the cathode of the diode VD with 3rd pin of the Integrated circuit IC 3 connects；2nd pin of the Integrated circuit IC 3 and the first end of the resistance R3 connect It connects；1st pin of the Integrated circuit IC 3 the 2nd end with the first end of the resistance R4, the change-over switch of relay K respectively Connection；1st end of the change-over switch of relay K is connect with the first end of the potentiometer RP2, sliding end respectively；The current potential The second end of device RP2 is grounded；The conversion with the second end, relay K of the resistance R3-R4 respectively of the second end of the resistance R2 The anode connection at the 3rd end, the battery GB of switch；The cathode of the battery GB is grounded.

10. a kind of charger for lithium ion battery according to claim 8 or 9, which is characterized in that the battery GB is can Rechargeable lithium ion battery；The Integrated circuit IC 3 is the adjustable integrated regulator in three ends.