CN211405518U - Lithium ion battery charger - Google Patents
Lithium ion battery charger Download PDFInfo
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- CN211405518U CN211405518U CN201922116822.7U CN201922116822U CN211405518U CN 211405518 U CN211405518 U CN 211405518U CN 201922116822 U CN201922116822 U CN 201922116822U CN 211405518 U CN211405518 U CN 211405518U
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- ion battery
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Abstract
The utility model relates to a lithium ion battery charger, when in use, a voltage reduction rectification unit transforms 220V alternating current commercial power and rectifies the alternating current commercial power into 6V direct current to supply a state display unit, a charging control unit and a lithium ion battery charging integrated circuit to work; the voltage setting unit and the current setting unit are used for setting constant charging voltage and current for the battery, the lithium ion battery charging integrated circuit performs constant current charging on the battery according to the set constant charging current during charging, when the voltage of the battery reaches the set constant voltage, the constant voltage charging is started for the battery, and then when the charging current of the battery is lower than fifteen percent of the maximum current in the previous charging process, the charging of the battery is stopped; and displaying whether the battery is being charged or not through a state display unit; the battery is protected and charged, the service life of the battery is prolonged, and the battery charger is simple in circuit, low in cost and small in size.
Description
Technical Field
The utility model relates to a lithium ion battery charging technology field, more specifically say, relate to a lithium ion battery charger.
Background
Lithium batteries are classified into lithium batteries and lithium ion batteries; lithium ion batteries are commonly called lithium batteries by people, the batteries generally adopt materials containing lithium elements as electrodes and are representative of modern high-performance batteries, and real lithium batteries are rarely applied to daily electronic products due to high danger.
A lithium ion battery is a secondary battery (rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode; during charging and discharging, Li + is inserted and extracted back and forth between two electrodes: during charging, Li + is extracted from the positive electrode and is inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.
However, most of the existing lithium ion battery chargers have the disadvantages of complex circuit structure, high cost, large volume and no constant voltage and constant current charging, so that the service life of the lithium ion battery is shortened.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a circuit simply, with low costs, small, lithium ion battery charger with constant voltage constant current charging function.
The utility model provides a technical scheme that its technical problem adopted is:
constructing a lithium ion battery charger comprising a lithium ion battery charging integrated circuit and a battery; the lithium ion battery charging integrated circuit is connected with a voltage setting unit, a current setting unit and a charging control unit, the charging control unit is also connected with the battery, and the battery is also connected with the lithium ion battery charging integrated circuit; the lithium ion battery charger also comprises a voltage reduction rectifying unit and a state display unit, wherein the voltage reduction rectifying unit is respectively connected with the state display unit, the charging control unit and the lithium ion battery charging integrated circuit; the lithium ion battery charging integrated circuit controls the charging control unit to perform constant voltage and constant current charging or stop charging on the battery;
the positive pole of the battery is connected with the BATT + end of the lithium ion battery charging integrated circuit, and the negative pole of the battery is connected with the BATT-end of the lithium ion battery charging integrated circuit.
The lithium ion battery charger of the utility model, wherein, the voltage reduction rectifier unit comprises a transformer, a rectifier bridge, a first capacitor and a three-terminal voltage regulator tube; the pin 1 and the pin 2 of the transformer are both connected with an external 220V alternating current commercial power, the pin 3 of the transformer is connected with the pin 1 of the rectifier bridge, and the pin 4 of the transformer is connected with the pin 3 of the rectifier bridge; the first capacitor is connected with pins 2 and 4 of the rectifier bridge in parallel, the pin 2 of the rectifier bridge is connected with the VI end of the three-terminal voltage regulator tube, the pin 4 of the rectifier bridge is grounded, and the GND end of the three-terminal voltage regulator tube is also grounded; the VI end of the three-end voltage-stabilizing tube is also connected with a second capacitor, the VO end of the three-end voltage-stabilizing tube is connected with a third capacitor, and the other ends of the second capacitor and the third capacitor are grounded; and the VO end of the three-end voltage stabilizing tube is the output end of the voltage reduction rectifying unit.
The utility model discloses a lithium ion battery charger, wherein, the charge control unit includes triode and diode and first resistance; the emitting electrode of the triode is respectively connected with the V + end of the lithium ion battery charging integrated circuit and the output end of the step-down rectifying unit, the first resistor is connected with the base electrode and the emitting electrode of the triode in parallel, the base electrode of the triode is further connected with the second resistor, the other end of the second resistor is connected with the DRV end of the lithium ion battery charging integrated circuit, the collector electrode of the triode is connected with the anode of the diode, the cathode of the diode is connected with the BATT + end of the lithium ion battery charging integrated circuit, and the cathode of the diode is further connected with the voltage setting unit.
The utility model discloses a lithium ion battery charger, wherein, voltage setting unit includes third resistance and fourth resistance; the third resistor is connected with the cathode of the diode, the other end of the third resistor is connected with the RV end of the lithium ion battery charging integrated circuit and the fourth resistor respectively, and the other end of the fourth resistor is connected with the BATT-end of the lithium ion battery charging integrated circuit and the current setting unit respectively.
The utility model discloses a lithium ion battery charger, wherein, the current setting unit is the fifth resistance; the fifth resistor is connected with the other end of the fourth resistor, and the other end of the fifth resistor is grounded.
The lithium ion battery charger of the present invention, wherein the state display unit comprises a first light emitting diode and a second light emitting diode; the anode of the first light-emitting diode is connected with a sixth resistor, the other end of the sixth resistor is connected with the output end of the step-down rectifying unit, and the cathode of the first light-emitting diode is respectively connected with the LED end of the lithium ion battery charging integrated circuit and the anode of the second light-emitting diode; and the negative electrode of the second light-emitting diode is connected with a seventh resistor, and the other end of the seventh resistor is grounded.
Lithium ion battery charger, wherein, lithium ion battery integrated circuit's model that charges is PS 1719.
The beneficial effects of the utility model reside in that: the voltage-reducing rectification unit transforms 220V alternating current commercial power and rectifies the alternating current commercial power into 6V direct current to be supplied to the state display unit, the charging control unit and the lithium ion battery charging integrated circuit to work; the voltage setting unit and the current setting unit are used for setting constant charging voltage and current for the battery, the lithium ion battery charging integrated circuit performs constant current charging on the battery according to the set constant charging current during charging, when the voltage of the battery reaches the set constant voltage, the constant voltage charging is started for the battery, and then when the charging current of the battery is lower than fifteen percent of the maximum current in the previous charging process, the charging of the battery is stopped; and displaying whether the battery is being charged or not through a state display unit; the battery is protected and charged, the service life of the battery is prolonged, and the battery charger is simple in circuit, low in cost and small in size.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
fig. 1 is a circuit diagram of a lithium ion battery charging integrated circuit, a current setting unit, a voltage setting unit, a charging control unit and a status display unit of a lithium ion battery charger according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of the step-down rectifying unit of the lithium ion battery charger according to the preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The lithium ion battery charging integrated circuit according to the preferred embodiment of the present invention is shown in fig. 1, and also refer to fig. 2; the charging device comprises a lithium ion battery charging integrated circuit U1 and a battery BAT 1; the lithium ion battery charging integrated circuit U1 is connected with a voltage setting unit 100, a current setting unit 200 and a charging control unit 300, the charging control unit 300 is also connected with a battery BAT1, and the battery BAT1 is also connected with a lithium ion battery charging integrated circuit U1; the lithium ion battery BAT1 charger further comprises a step-down rectifying unit 400 and a state display unit 500, wherein the step-down rectifying unit 400 is respectively connected with the state display unit 500, the charging control unit 300 and the lithium ion battery charging integrated circuit U1; the lithium ion battery charging integrated circuit U1 controls the charging control unit 300 to perform constant voltage and constant current charging or stop charging on the battery BAT 1;
the positive electrode of the battery BAT1 is connected with the BATT + end of the lithium ion battery charging integrated circuit U1, and the negative electrode of the battery BAT1 is connected with the BATT-end of the lithium ion battery charging integrated circuit U1;
the voltage-reducing rectification unit 400 transforms and rectifies 220V alternating current commercial power into 6V direct current to be supplied to the state display unit 500, the charging control unit 300 and the lithium ion battery charging integrated circuit U1 to work; the voltage setting unit 100 and the current setting unit 200 are used for setting constant charging voltage and current for the battery BAT1, the lithium ion battery charging integrated circuit U1 performs constant current charging on the battery BAT1 according to the set constant charging current during charging, when the voltage of the battery BAT1 reaches the set constant voltage, the battery BAT1 starts to perform constant voltage charging, and then when the charging current of the battery BAT1 is lower than fifteen percent of the maximum current in the previous charging process, the battery BAT1 is stopped to be charged; and displays whether the battery BAT1 is being charged through the state display unit 500; the battery BAT1 is charged in a protection mode, the service life of the battery BAT1 is prolonged, and the battery BAT1 charging circuit is simple, low in cost and small in size.
As shown in fig. 2, the buck rectifying unit 400 includes a transformer TR1, a rectifier bridge BR1, a first capacitor C3, and a three-terminal regulator tube U2; a pin 1 and a pin 2 of the transformer TR1 are both connected with an external 220V alternating current mains supply, a pin 3 of the transformer TR1 is connected with a pin 1 of a rectifier bridge BR1, and a pin 4 of the transformer TR1 is connected with a pin 3 of a rectifier bridge BR 1; the first capacitor C3 is connected in parallel with a pin 2 and a pin 4 of the rectifier bridge BR1, the pin 2 of the rectifier bridge BR1 is connected with the VI end of the three-terminal regulator tube U2, the pin 4 is grounded, and the GND end of the three-terminal regulator tube U2 is also grounded; the VI end of the three-terminal voltage regulator tube U2 is also connected with a second capacitor C4, the VO end of the three-terminal voltage regulator tube U2 is connected with a third capacitor C5, and the other ends of the second capacitor C4 and the third capacitor C5 are both grounded; the VO end of the three-terminal regulator tube U2 is the output end of the buck rectifying unit 400; the transformer TR1 and the rectifier bridge BR1 are used for voltage reduction and rectification, the circuit is simple, the cost is low, and the isolation effect is achieved; the first capacitor C3 is used for coupling to make the waveform smoother; the model number of the three-terminal regulator tube U2 is 7806, and the three-terminal regulator tube U2 is used for outputting 6V direct current so as to meet the use requirement of a lower-stage circuit.
As shown in fig. 1 and 2, the charge control unit 300 includes a transistor Q1, a diode D1, and a first resistor R1; an emitter of the triode Q1 is connected with a V + end of the lithium ion battery charging integrated circuit U1 and an output end of the buck rectifying unit 400 respectively, a first resistor R1 is connected in parallel with a base and an emitter of the triode Q1, the base of the triode Q1 is also connected with a second resistor R2, the other end of the second resistor R2 is connected with a DRV end of the lithium ion battery charging integrated circuit U1, a collector of the triode Q1 is connected with an anode of the diode D1, a cathode of the diode D1 is connected with a BATT + end of the lithium ion battery charging integrated circuit U1, and a cathode of the diode D1 is also connected with the voltage setting unit 100; the circuit is simple, the cost is low, and the volume is small.
As shown in fig. 1, the voltage setting unit 100 includes a third resistor R3 and a fourth resistor R4; the third resistor R3 is connected with the negative electrode of the diode D1, the other end of the third resistor R3 is connected with the RV end of the lithium ion battery charging integrated circuit U1 and the fourth resistor R4 respectively, and the other end of the fourth resistor R4 is connected with the BATT-end of the lithium ion battery charging integrated circuit U1 and the current setting unit 200 respectively; the constant voltage for charging the battery BAT1 by the lithium ion battery charging integrated circuit U1 is 2.5(1+ R3/R4).
As shown in fig. 1, the current setting unit 200 is a fifth resistor R5; the fifth resistor R5 is connected with the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is grounded; the constant current for charging the battery BAT1 by the lithium ion battery charging integrated circuit U1 is 160 mV/R5.
As shown in fig. 1 and 2, the state display unit 500 includes a first light emitting diode D3 and a second light emitting diode D2; the anode of the first light-emitting diode D3 is connected with a sixth resistor R7, the other end of the sixth resistor R7 is connected with the output end of the step-down rectifying unit 400, and the cathode of the first light-emitting diode D3 is connected with the LED end of the lithium-ion battery charging integrated circuit U1 and the anode of the second light-emitting diode D2 respectively; the negative electrode of the second light emitting diode D2 is connected with a seventh resistor R6, and the other end of the seventh resistor R6 is grounded; the second led D2 is turned on during charging, and the first led D3 is turned on when the battery BAT1 is fully charged.
As shown in fig. 1, the lithium ion battery charging integrated circuit U1 is model number PS 1719; the integrated circuit integrates a voltage control circuit, a current control circuit, a logic control circuit, a driving circuit and the like, so that the size of the lithium ion battery charger is greatly reduced.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (7)
1. A lithium ion battery charger comprises a lithium ion battery charging integrated circuit and a battery; the lithium ion battery charging integrated circuit is connected with a voltage setting unit, a current setting unit and a charging control unit, the charging control unit is also connected with the battery, and the battery is also connected with the lithium ion battery charging integrated circuit; the lithium ion battery charger also comprises a voltage reduction rectifying unit and a state display unit, wherein the voltage reduction rectifying unit is respectively connected with the state display unit, the charging control unit and the lithium ion battery charging integrated circuit; the lithium ion battery charging integrated circuit controls the charging control unit to perform constant voltage and constant current charging or stop charging on the battery;
the positive pole of the battery is connected with the BATT + end of the lithium ion battery charging integrated circuit, and the negative pole of the battery is connected with the BATT-end of the lithium ion battery charging integrated circuit.
2. The lithium ion battery charger according to claim 1, wherein the step-down rectifying unit comprises a transformer, a rectifying bridge and a first capacitor and a three-terminal regulator tube; the pin 1 and the pin 2 of the transformer are both connected with an external 220V alternating current commercial power, the pin 3 of the transformer is connected with the pin 1 of the rectifier bridge, and the pin 4 of the transformer is connected with the pin 3 of the rectifier bridge; the first capacitor is connected with pins 2 and 4 of the rectifier bridge in parallel, the pin 2 of the rectifier bridge is connected with the VI end of the three-terminal voltage regulator tube, the pin 4 of the rectifier bridge is grounded, and the GND end of the three-terminal voltage regulator tube is also grounded; the VI end of the three-end voltage-stabilizing tube is also connected with a second capacitor, the VO end of the three-end voltage-stabilizing tube is connected with a third capacitor, and the other ends of the second capacitor and the third capacitor are grounded; and the VO end of the three-end voltage stabilizing tube is the output end of the voltage reduction rectifying unit.
3. The lithium ion battery charger of claim 2, wherein the charge control unit comprises a transistor and a diode and a first resistor; the emitting electrode of the triode is respectively connected with the V + end of the lithium ion battery charging integrated circuit and the output end of the step-down rectifying unit, the first resistor is connected with the base electrode and the emitting electrode of the triode in parallel, the base electrode of the triode is further connected with the second resistor, the other end of the second resistor is connected with the DRV end of the lithium ion battery charging integrated circuit, the collector electrode of the triode is connected with the anode of the diode, the cathode of the diode is connected with the BATT + end of the lithium ion battery charging integrated circuit, and the cathode of the diode is further connected with the voltage setting unit.
4. The lithium ion battery charger of claim 3, wherein the voltage setting unit comprises a third resistor and a fourth resistor; the third resistor is connected with the cathode of the diode, the other end of the third resistor is connected with the RV end of the lithium ion battery charging integrated circuit and the fourth resistor respectively, and the other end of the fourth resistor is connected with the BATT-end of the lithium ion battery charging integrated circuit and the current setting unit respectively.
5. The lithium ion battery charger according to claim 4, wherein the current setting unit is a fifth resistor; the fifth resistor is connected with the other end of the fourth resistor, and the other end of the fifth resistor is grounded.
6. The lithium ion battery charger of claim 2, wherein the status display unit comprises a first light emitting diode and a second light emitting diode; the anode of the first light-emitting diode is connected with a sixth resistor, the other end of the sixth resistor is connected with the output end of the step-down rectifying unit, and the cathode of the first light-emitting diode is respectively connected with the LED end of the lithium ion battery charging integrated circuit and the anode of the second light-emitting diode; and the negative electrode of the second light-emitting diode is connected with a seventh resistor, and the other end of the seventh resistor is grounded.
7. The lithium ion battery charger of claim 1, wherein the lithium ion battery charging integrated circuit is model number PS 1719.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922116822.7U CN211405518U (en) | 2019-12-02 | 2019-12-02 | Lithium ion battery charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922116822.7U CN211405518U (en) | 2019-12-02 | 2019-12-02 | Lithium ion battery charger |
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| Publication Number | Publication Date |
|---|---|
| CN211405518U true CN211405518U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922116822.7U Active CN211405518U (en) | 2019-12-02 | 2019-12-02 | Lithium ion battery charger |
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| CN (1) | CN211405518U (en) |
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- 2019-12-02 CN CN201922116822.7U patent/CN211405518U/en active Active
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