CN210404771U - Charging circuit capable of intelligently detecting charging current of charger at maximum output - Google Patents
Charging circuit capable of intelligently detecting charging current of charger at maximum output Download PDFInfo
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- CN210404771U CN210404771U CN201921080688.3U CN201921080688U CN210404771U CN 210404771 U CN210404771 U CN 210404771U CN 201921080688 U CN201921080688 U CN 201921080688U CN 210404771 U CN210404771 U CN 210404771U
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- 238000007600 charging Methods 0.000 title claims abstract description 50
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims abstract description 36
- 238000010280 constant potential charging Methods 0.000 claims abstract description 28
- 238000010277 constant-current charging Methods 0.000 claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract 2
- 150000004706 metal oxides Chemical class 0.000 claims abstract 2
- 239000004065 semiconductor Substances 0.000 claims abstract 2
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a but intellectual detection system charger is at maximum output charging current's charging circuit, it includes: a USB input; a DC-DC boost unit connected to the USB input terminal; the current detection unit comprises a current detection resistor connected with the USB input end and a first operational amplifier module and a second operational amplifier module connected with the current detection resistor; the constant-current constant-voltage charging control unit comprises a first MOS (metal oxide semiconductor) tube, a second MOS tube, a third MOS tube, a constant-current constant-voltage charging control chip and a +5V power module, wherein the first MOS tube and the second MOS tube are connected with the DC-DC boosting unit; the battery protection unit comprises a battery chip, and the battery chip is connected with each battery in the battery pack, the constant-current constant-voltage charging control chip and the +5V power module; the constant-current constant-voltage charging control chip is connected with the DC-DC boosting unit to control the DC-DC boosting unit to work; the constant current and constant voltage charging control chip is connected with the first operational amplifier module and the second operational amplifier module.
Description
The technical field is as follows:
the utility model relates to a battery package technical field that charges refers in particular to a but intelligent detection charger is at maximum output charging current's charging circuit.
Background art:
most of the current battery packs use special chargers mostly, because the battery packs are divided into series connection and parallel connection according to the number of batteries which are applied to 18650, the more series connection represents higher voltage, the more parallel connection represents higher capacity, and charging current needs to be increased greatly, so the battery packs of different styles have good special chargers, which causes trouble degree in use.
At present, the USB chargers have too many different output currents, namely basic 5V/1A and conventional 5V/2A, or faster 3A, 4A and the like, if the battery pack sets 2A input current, the 5V/1A charger charges the battery pack, the charger can generate overcurrent protection, and the battery pack cannot be charged normally. If a 5V/3A or 5V/4A charger is used for charging, the battery pack also inputs 2A current, so that the maximum output of the charger is not used, and the battery pack is lengthened a lot.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
an object of the utility model is to overcome prior art's not enough, provide a but intelligent detection charger at the charging circuit of the biggest output charging current.
In order to solve the technical problem, the utility model discloses a following technical scheme: but the charging circuit of intellectual detection system charger at the maximum output charging current includes: a USB input; a DC-DC boosting unit connected to the USB input terminal and used for boosting the input voltage to the USB input terminal to a voltage for charging the battery; the current detection unit comprises a current detection resistor connected with the USB input end, a first operational amplifier module connected with the current detection resistor and a second operational amplifier module connected with the first operational amplifier module; the constant-current constant-voltage charging control unit comprises a first MOS tube, a second MOS tube, a third MOS tube, a constant-current constant-voltage charging control chip and a +5V power module, wherein the first MOS tube and the second MOS tube are connected with the DC-DC boosting unit; the battery protection unit comprises a battery protection chip, the battery protection chip is connected with each battery in the battery pack to detect the voltage of each battery, and the battery protection chip is also connected with the constant-current constant-voltage charging control chip and the +5V power supply module to transmit the voltage data of each battery to the constant-current constant-voltage charging control chip; the constant-current constant-voltage charging control chip is connected with the DC-DC boosting unit to control the DC-DC boosting unit to work; the constant-current and constant-voltage charging control chip is connected with the first operational amplifier module and the second operational amplifier module and used for receiving input current data so as to output and control the duty ratio of the DC-DC boosting unit and output the maximum rated charging current.
In the above technical solution, the DC-DC boost unit includes an inductor L1, a fourth MOS transistor, a diode D1, and an electrolytic capacitor EC2, a D pole of the fourth MOS transistor is connected to the inductor L1 and the diode D1, an S pole of the fourth MOS transistor is connected to ground, a G pole of the fourth MOS transistor is connected to the constant current and constant voltage charging control chip, the inductor L1 is connected to the USB input terminal, and the diode D1 is connected to the electrolytic capacitor EC 2.
Furthermore, in the above technical solution, the first operational amplifier module includes a first operational amplifier, a pin of the first operational amplifier is connected to the current detection resistor after being connected to the resistor R53, a pin of the first operational amplifier is connected to the ground after being connected to the resistor R54, a pin of the first operational amplifier is connected to the resistor R56 and then connected to the constant current and constant voltage charging control chip, and a resistor R55 is connected in parallel between the pin of the first operational amplifier and the pin of the first operational amplifier.
Furthermore, in the above technical solution, the second operational amplifier module includes a second operational amplifier, a pin of the second operational amplifier is connected to the resistor R60, the resistor R61, and the resistor R62 and then connected to the constant current and constant voltage charging control chip, a pin of the second operational amplifier is further connected to the resistor R59 and then connected to the current detection resistor, and an out pin of the second operational amplifier is connected to the resistor R56 and then connected to the constant current and constant voltage charging control chip.
Furthermore, in the above technical solution, a D pole of the first MOS transistor is connected to a D pole of the second MOS transistor, an S pole of the first MOS transistor is connected to the DC-DC boost unit, and an S pole of the second MOS transistor is connected to the battery pack; the G pole of the second MOS tube is connected with the G pole of the first MOS tube and is connected with the D pole of the third MOS tube, the S pole of the third MOS tube is grounded, and the G pole of the third MOS tube is connected with the constant-current and constant-voltage charging control chip.
Further, in the above technical solution, a resistor R51, a diode D51, a capacitor C52, and a resistor R52 are further connected between the G-pole of the third MOS transistor and the constant-current and constant-voltage charging control chip.
Further, in the above technical solution, the constant current and constant voltage charging control unit further includes an electric quantity display unit, and the electric quantity display unit is connected to the battery pack.
Furthermore, in the above technical solution, the electric quantity display unit includes a plurality of LEDs, the LEDs are connected to the constant current and constant voltage charging control chip after being connected to a resistor, and the LEDs are also connected to the battery pack.
Further, in the above technical solution, the battery protection unit includes a battery protection chip, the type of the battery protection chip is S8223CAE-I6T1U, the 3 rd, 4 th and 5 th pins of the battery protection chip are all connected to at least one resistor and then connected to one battery in the battery pack, and the 1 st pin of the battery protection chip is connected to the constant current and constant voltage charging control chip.
Further, in the above technical solution, the model of the constant-current constant-voltage charging control chip is MC96F 8208S.
After the technical scheme is adopted, compared with the prior art, the utility model has following beneficial effect: the utility model discloses make various USB chargers can both charge to let every USB charger exert the biggest rated output current, charge to the battery package, the speed of charging reaches the fastest, most suitable, and it is very convenient to use.
Description of the drawings:
fig. 1 is a circuit diagram of the present invention.
The specific implementation mode is as follows:
the present invention will be further described with reference to the following specific embodiments and accompanying drawings.
Referring to fig. 1, a charging circuit capable of intelligently detecting a maximum output charging current of a charger is disclosed, the charging circuit includes: a USB input terminal 1; a DC-DC boost unit 2 connected to the USB input terminal 1 and used to boost the input voltage to the USB input terminal 1 to a voltage for charging the battery; a current detection unit 3, which comprises a current detection resistor 31 connected with the USB input terminal 1, a first operational amplifier module 32 connected with the current detection resistor 31, and a second operational amplifier module 33 connected with the first operational amplifier module 32; the constant-current constant-voltage charging control unit 4 comprises a first MOS tube 41 and a second MOS tube 42 which are connected with the DC-DC boosting unit 2, a third MOS tube 43 used for controlling the conduction of the first MOS tube 41 and the second MOS tube 42, a constant-current constant-voltage charging control chip 44 connected with the third MOS tube 43, and a +5V power module 45 used for supplying power to the constant-current constant-voltage charging control chip 44, wherein the second MOS tube 42 is connected with the battery pack 5; the battery protection unit 6 comprises a battery protection chip 61, the battery chip 61 is connected with each battery 51 in the battery pack 5 to detect the voltage of each battery, and the battery protection chip 61 is also connected with the constant-current constant-voltage charging control chip 44 and the +5V power module 45 to transmit the voltage data of each battery 51 to the constant-current constant-voltage charging control chip 44; the constant-current and constant-voltage charging control chip 44 is connected with the DC-DC boosting unit 2 to control the DC-DC boosting unit 2 to work; the constant-current constant-voltage charging control chip 44 is connected to the first operational amplifier module 32 and the second operational amplifier module 33 for receiving input current data, so as to output a duty ratio for controlling the DC-DC boost unit 2, and output a maximum rated charging current.
The DC-DC boost unit 2 includes an inductor L1, a fourth MOS transistor Q1, a diode D1 and an electrolytic capacitor EC2, the D pole of the fourth MOS transistor Q1 is connected to an inductor L1 and a diode D1, the S pole of the fourth MOS transistor Q1 is connected to ground, the G pole of the fourth MOS transistor Q1 is connected to the constant current and constant voltage charging control chip 44, the inductor L1 is connected to the USB input terminal 1, and the diode D1 is connected to the electrolytic capacitor EC 2. The constant-current constant-voltage charging control chip 44 controls the fourth MOS transistor Q1 to conduct and operate, so that the DC-DC boost unit 2 operates.
The first operational amplifier module 32 includes a first operational amplifier 321, a pin-connecting resistor R53 of the first operational amplifier 321 is connected to the current detection resistor 31, a pin + of the first operational amplifier 321 is connected to the ground after being connected to the resistor R54, a pin-out of the first operational amplifier 321 is connected to the resistor R56 and is connected to the constant-current and constant-voltage charging control chip 44, and a resistor R55 is connected in parallel between the pin-out and the pin-out of the first operational amplifier 321. The second operational amplifier module 33 includes a second operational amplifier 331, a pin of the second operational amplifier 331 is connected to the resistor R60, the resistor R61, the resistor R62 and then connected to the constant current and constant voltage charging control chip 44, a pin of the second operational amplifier 331 is further connected to the resistor R59 and then connected to the current detection resistor 31, and a pin out of the second operational amplifier 331 is connected to the resistor R56 and then connected to the constant current and constant voltage charging control chip 44.
The D pole of the first MOS transistor 41 is connected with the D pole of the second MOS transistor 42, the S pole of the first MOS transistor 41 is connected with the DC-DC boosting unit 2, and the S pole of the second MOS transistor 42 is connected with the battery pack 5; the G pole of the second MOS transistor 42 is connected to the G pole of the first MOS transistor 41, the D pole of the third MOS transistor 43 is connected to the ground, the S pole of the third MOS transistor 43 is connected to the ground, and the G pole of the third MOS transistor 43 is connected to the constant-current constant-voltage charging control chip 44. A resistor R51, a diode D51, a capacitor C52 and a resistor R52 are connected between the G-pole of the third MOS transistor 43 and the constant-current and constant-voltage charging control chip 44. When the battery voltage is charged to 4.25V, the Bat _ En of the battery protection chip 61 is at a high level, the PWM _0 pin of the constant current and constant voltage charging control chip 44 becomes a low level, and at this time, the first MOS transistor 41 and the second MOS transistor 42 are turned off, so that the battery pack cannot be charged. At this time, the pins PWM _0, PWM _1 and PWM _2 of the constant-current constant-voltage charging control chip 44 all stop operating and enter a low-loss standby state, so that the charging control chip is more energy-saving and environment-friendly when in use, and can prolong the service life.
The constant-current constant-voltage charging control unit 4 further comprises an electric quantity display unit 7, and the electric quantity display unit 7 is connected with the battery pack 5. The electric quantity display unit 7 comprises a plurality of LEDs, the LEDs are connected with a resistor and then connected with the constant-current constant-voltage charging control chip 44, and the LEDs are also connected with the battery pack 5.
The battery protection unit 6 comprises a battery protection chip 61, the model number of the battery protection chip 61 is S8223CAE-I6T1U, the 3 rd, 4 th and 5 th pins of the battery protection chip 61 are connected with at least one resistor and then connected with a battery in the battery pack 5, and the 1 st pin of the battery protection chip 61 is connected with the constant-current and constant-voltage charging control chip 44. The model of the constant-current constant-voltage charging control chip 44 is MC96F 8208S.
To sum up, the utility model discloses during operation, when this USB input 1 circular telegram, this constant current constant voltage charge control chip 44 then controls this DC-DC boost unit 2 work, and output voltage can reach the setpoint; when each voltage of the battery pack is low, the battery protection chip 61 detects that each voltage of the battery pack is low, and transmits data to the constant-current constant-voltage charging control chip 44, the constant-current constant-voltage charging control chip 44 outputs a PWM signal from 0% to 100%, and controls the first MOS transistor 41 and the second MOS transistor 42 to be conducted from soft start to full conduction so as to charge the battery pack, at this time, the charging current is continuously increased from a small current, that is, the constant-current constant-voltage charging control chip 44 outputs a PWM signal with a continuously increased duty ratio until the charging current is increased to a voltage at the USB input terminal 1 until the voltage becomes a low level, which represents that the charger has not output a larger current, so as to achieve an over-current protection action. In the process, the first operational amplifier module 32 will amplify the signal of the current flowing through the current detection resistor 31 as the signal of the forward input terminal of the second operational amplifier module 33, and operate with the reverse input terminal of the second operational amplifier module 33, at this time, the comparison voltage (the voltage of the ADC _ V pin in the constant current and constant voltage charging control chip 44) will be obtained, and then the duty ratio of the DC-DC boosting unit 2 will be outputted and controlled through the internal calculation of the constant current and constant voltage charging control chip 44. Constant current constant voltage charging control chip 44 can record the quasi-position before USB input 1 voltage falls, and this quasi-position is then the maximum output current of charger, so no matter be charger output current 1A, 1.5A, 2A, 2.5A, 3A, 4A, can all set for maximum current charging through this detection mode, promptly the utility model discloses can the maximum power output of intelligent recognition charger to this makes to charge more fast more convenient, so, the utility model discloses make various USB chargers can both charge to let every USB charger exert maximum rated output current, charge to the battery package, the charging speed reaches the fastest, most suitable, and it is very convenient to use.
Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. But the charging circuit of intellectual detection system charger at the maximum output charging current, its characterized in that: the charging circuit includes:
a USB input (1);
a DC-DC boost unit (2) connected to the USB input terminal (1) and used for boosting the input voltage to the USB input terminal (1) to a battery charging voltage;
a current detection unit (3) which comprises a current detection resistor (31) connected with the USB input end (1), a first operational amplifier module (32) connected with the current detection resistor (31) and a second operational amplifier module (33) connected with the first operational amplifier module (32);
the constant-current constant-voltage charging control unit (4) comprises a first MOS (metal oxide semiconductor) tube (41) and a second MOS tube (42) which are connected with the DC-DC boosting unit (2), a third MOS tube (43) which is used for controlling the conduction of the first MOS tube (41) and the second MOS tube (42), a constant-current constant-voltage charging control chip (44) which is connected with the third MOS tube (43), and a +5V power supply module (45) which is used for supplying power to the constant-current constant-voltage charging control chip (44), wherein the second MOS tube (42) is connected with a battery pack (5);
the battery protection unit (6) comprises a battery protection chip (61), the battery protection chip (61) is connected with each battery (51) in the battery pack (5) to detect the voltage of each battery, and the battery protection chip (61) is also connected with the constant-current constant-voltage charging control chip (44) and the +5V power module (45) to transmit the voltage data of each battery (51) to the constant-current constant-voltage charging control chip (44);
the constant-current and constant-voltage charging control chip (44) is connected with the DC-DC boosting unit (2) to control the DC-DC boosting unit (2) to work; the constant-current constant-voltage charging control chip (44) is connected with the first operational amplifier module (32) and the second operational amplifier module (33) and used for receiving input current data so as to output and control the duty ratio of the DC-DC boosting unit (2) and output the maximum rated charging current.
2. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 1, wherein: the DC-DC boosting unit (2) comprises an inductor L1, a fourth MOS tube Q1, a diode D1 and an electrolytic capacitor EC2, wherein the D pole of the fourth MOS tube Q1 is connected with an inductor L1 and a diode D1, the S pole of the fourth MOS tube Q1 is connected with the ground, the G pole of the fourth MOS tube Q1 is connected with the constant-current and constant-voltage charging control chip (44), the inductor L1 is connected with the USB input end (1), and the diode D1 is connected with the electrolytic capacitor EC 2.
3. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 1, wherein: the first operational amplifier module (32) comprises a first operational amplifier (321), a pin of the first operational amplifier (321) is connected with the current detection resistor (31) after being connected with a resistor R53, a pin of the first operational amplifier (321) is connected with the ground after being connected with a resistor R54, an out pin of the first operational amplifier (321) is connected with a resistor R56 and then is connected with the constant-current and constant-voltage charging control chip (44), and a resistor R55 is connected between the out pin and the pin of the first operational amplifier (321) in parallel.
4. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 3, wherein: the second operational amplifier module (33) comprises a second operational amplifier (331), a pin of the second operational amplifier (331) is connected with the constant-current and constant-voltage charging control chip (44) after being connected with a resistor R60, a resistor R61 and a resistor R62, a pin of the second operational amplifier (331) is also connected with the resistor R59 and then connected with the current detection resistor (31), and an out pin of the second operational amplifier (331) is connected with the resistor R56 and then connected with the constant-current and constant-voltage charging control chip (44).
5. The charging circuit capable of intelligently detecting the maximum output charging current of the charger according to any one of claims 1 to 4, wherein: the D pole of the first MOS tube (41) is connected with the D pole of the second MOS tube (42), the S pole of the first MOS tube (41) is connected with the DC-DC boosting unit (2), and the S pole of the second MOS tube (42) is connected with the battery pack (5); the G pole of the second MOS tube (42) is connected with the G pole of the first MOS tube (41) and is connected with the D pole of the third MOS tube (43), the S pole of the third MOS tube (43) is grounded, and the G pole of the third MOS tube (43) is connected with the constant-current constant-voltage charging control chip (44).
6. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 5, wherein: and a resistor R51, a diode D51, a capacitor C52 and a resistor R52 are also connected between the G electrode of the third MOS tube (43) and the constant-current and constant-voltage charging control chip (44).
7. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 1, wherein: the constant-current constant-voltage charging control unit (4) further comprises an electric quantity display unit (7), and the electric quantity display unit (7) is connected with the battery pack (5).
8. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 7, wherein: the electric quantity display unit (7) comprises a plurality of LEDs, the LEDs are connected with a resistor and then connected with the constant-current constant-voltage charging control chip (44), and the LEDs are also connected with the battery pack (5).
9. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 5, wherein: the battery protection unit (6) comprises a battery protection chip (61), the type number of the battery protection chip (61) is S8223CAE-I6T1U, the 3 rd, 4 th and 5 th pins of the battery protection chip (61) are connected with at least one resistor and then connected with a battery in the battery pack (5), and the 1 st pin of the battery protection chip (61) is connected with the constant-current and constant-voltage charging control chip (44).
10. The charging circuit capable of intelligently detecting the maximum output charging current of the charger as claimed in claim 5, wherein: the model of the constant-current constant-voltage charging control chip (44) is MC96F 8208S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921080688.3U CN210404771U (en) | 2019-07-10 | 2019-07-10 | Charging circuit capable of intelligently detecting charging current of charger at maximum output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921080688.3U CN210404771U (en) | 2019-07-10 | 2019-07-10 | Charging circuit capable of intelligently detecting charging current of charger at maximum output |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210404771U true CN210404771U (en) | 2020-04-24 |
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ID=70354659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921080688.3U Expired - Fee Related CN210404771U (en) | 2019-07-10 | 2019-07-10 | Charging circuit capable of intelligently detecting charging current of charger at maximum output |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210404771U (en) |
-
2019
- 2019-07-10 CN CN201921080688.3U patent/CN210404771U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200424 |
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| CF01 | Termination of patent right due to non-payment of annual fee |