CN211183457U - Charger low current output circuit - Google Patents
Charger low current output circuit Download PDFInfo
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- CN211183457U CN211183457U CN201922132040.2U CN201922132040U CN211183457U CN 211183457 U CN211183457 U CN 211183457U CN 201922132040 U CN201922132040 U CN 201922132040U CN 211183457 U CN211183457 U CN 211183457U
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Abstract
The utility model belongs to the technical field of the treasured that charges, specifically provide a treasured low current output circuit that charges, including precious battery management chip, power, pilot lamp and the switch of taking oneself of charging, battery management chip includes the flashlight function end; the functional end of the flashlight is electrically connected with one end of the switch, and the other end of the switch is grounded; the functional end of the flashlight is also electrically connected with the anode of the indicator light, and the cathode of the indicator light is grounded; the MOS transistor further comprises a first resistor and an MOS transistor; the MOS tube is an N-type MOS tube; the D pole of the MOS tube is electrically connected with one end of a first resistor, and the other end of the first resistor is connected with a power supply; the S pole of the MOS tube is grounded; the G pole of the MOS tube is electrically connected with the ungrounded end of the switch, and the G pole of the MOS tube is also electrically connected with the functional end of the flashlight. Use this application, only need to carry out very little change to current treasured that charges, can let the treasured function that charges possess and last low current and charge.
Description
Technical Field
The invention belongs to the technical field of charge pal, and particularly relates to a low-current output circuit of a charge pal.
Background
The charger is also called a mobile power supply and a mobile charger. The portable charger is a portable charger which can be carried about by a person, can store electric energy by the person, is mainly used for charging consumer electronic products (such as a wireless telephone and a notebook computer) such as handheld mobile equipment and the like, and is particularly applied to occasions without external power supply.
The appearance of the charger brings great convenience to the life of people, and the embarrassment that the telephone is not powered when a lot of telephones are needed is avoided. However, most of the existing charging pal is automatically powered off when the load current is small, and the automatic power-off action cannot be cancelled, so that the charging pal cannot charge devices such as mp3 and bluetooth earphones, and a mobile phone cannot be fully charged (for example, a 4.2V battery can only be charged to 4.0V out).
Many treasureds that charge automatically turn off when output current is less than 0.2A. If a new battery management chip is specially added to enable the charger to charge at a low current, the cost is high.
Therefore, a low current output circuit of a charger bank is needed, which can transform the charger bank with lower cost, so that the charger bank can realize low current charging.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a precious low current output circuit charges can reform transform the precious that charges with lower cost, makes it realize that the low current charges.
The utility model provides a basic scheme does:
the charger low-current output circuit comprises a battery management chip, a power supply, an indicator light and a switch, wherein the battery management chip comprises a flashlight function end; the functional end of the flashlight is electrically connected with one end of the switch, and the other end of the switch is grounded; the functional end of the flashlight is also electrically connected with the anode of the indicator light, and the cathode of the indicator light is grounded;
the MOS transistor further comprises a first resistor and an MOS transistor; the MOS tube is an N-type MOS tube; the D pole of the MOS tube is electrically connected with one end of a first resistor, and the other end of the first resistor is connected with a power supply; the S pole of the MOS tube is grounded; the G pole of the MOS tube is electrically connected with the ungrounded end of the switch, and the G pole of the MOS tube is also electrically connected with the functional end of the flashlight.
Basic scheme theory of operation and beneficial effect:
1. the external equipment is connected into a charging interface of the charging treasure, and an external load output circuit of the charging treasure starts to work and charges the external equipment. When external equipment is equipment such as bluetooth headset, the external output current of treasured that charges can be very little, under the normal condition, the treasured that charges can automatic shutdown.
Use this application, can closed switch this moment, like this, the voltage of the flashlight function end of battery management chip is 0V, after power management chip detects the 0V that lasts for a certain period, judges that the switch is closed for a long time, just can export a higher voltage at the flashlight function end. This belongs to the prior art that the flashlight was opened among the current treasured that charges, and the logic judgement that wherein relates also belongs to prior art, and it is no longer repeated here.
Because the G pole of the MOS tube is electrically connected with the functional end of the flashlight, when the functional end of the flashlight outputs a higher voltage, the MOS tube is conducted, then the first resistor generates an extra current, the actual current identified by the battery management chip is the sum of the external charging current and the extra current, namely, the current identified by the battery management chip meets the current for normal charging.
For example, the automatic shutdown current of a certain charger baby is 100 milliamperes, the charging current of a low-current charging device is only 50 milliamperes, the charger baby is directly charged, and the charger baby can be automatically shut down; after an extra current of 90 milliamperes is added, the current detected by the battery management chip is larger than 100 milliamperes, the charger does not turn off the output, and then the charging is continuously carried out. When the charging equipment is fully charged and the charging current is reduced to a few milliamperes or even 0 milliampere, the total charging current is less than 100 milliamperes, and the charger can be automatically shut down.
Compared with the prior art, use this application, even use the treasured that charges to charge for equipment such as bluetooth headset, also can carry out the low current that lasts and charge.
2. When the functional end of the flashlight outputs a higher voltage, namely the MOS tube is conducted, the loop where the indicator light is located is connected, and the indicator light can be lightened. Through observing the state of pilot lamp, can know whether the treasured that charges is carrying out the electric current charge continuously. Besides, whether the circuit normally operates can be known through the indicator light, and if the indicator light is not turned on after the switch is closed, the circuit is in a problem and needs to be repaired.
3. The circuit structure can fully utilize the existing structure of the charger, and continuous low-current charging can be realized only by changing the circuit.
Further, the switch is a key switch.
The operation of the key switch is very convenient.
Furthermore, the device also comprises a second resistor, and the key switch is grounded after passing through the second resistor.
The second resistor can further protect the circuit.
Furthermore, the LED lamp also comprises a third resistor, and the cathode of the indicator lamp is grounded after passing through the third resistor.
The third resistor can protect a loop where the indicator lamp is located.
Further, the third resistance is 100-.
Therefore, the circuit can be well protected.
Further, the indicator lamp is an L ED lamp.
L ED lamps are readily available and easy to install.
Further, the L ED lamp emitted red in color.
The red color is more striking compared to other colors.
Further, the type of the MOS tube is AO 3400.
The MOS tube of the type has good quality and stable working performance.
Further, the device also comprises a singlechip and a timer; the single chip microcomputer is electrically connected with a power supply of the charger, the single chip microcomputer is positioned between the flashlight function end and the G pole of the MOS tube, the flashlight function end is electrically connected with a first input pin of the single chip microcomputer, and the G pole of the MOS tube is electrically connected with a first output pin of the single chip microcomputer; the positive electrode of the power supply end of the timer is electrically connected with the functional end of the flashlight, the negative electrode of the timer is grounded, and the output end of the timer is electrically connected with the second input pin of the single chip microcomputer.
After the key switch is turned on, the functional end of the flashlight continuously sends a high level to the single chip microcomputer through the first input pin, so that the single chip microcomputer starts to work; meanwhile, the voltage output by the functional end of the flashlight enables the timer to start working, and the timer sends a high-level signal to the single chip microcomputer through a second input pin of the single chip microcomputer every X seconds; the specific value of X can be set by those skilled in the art according to the time required for detecting the low current continuously when the charger is turned off automatically.
The singlechip receives the high level signal that the time-recorder sent once, just sends a level of switching on through first output pin for the G utmost point of MOS pipe and switches on the MOS pipe to provide an extra electric current for precious battery management chip that charges. Therefore, the battery management chip of the charge pal can be prevented from continuously receiving the low current and enabling the charge pal to automatically shut down. The single chip microcomputer outputs the conduction level of an MOS tube every time the single chip microcomputer receives a high level signal, wherein related programs belong to the prior art and are not described again.
Simultaneously, adopt this kind of mode, because first resistance can not switch on always, can practice thrift precious electric quantity that charges.
Further, the first resistance is 10-50 ohms.
The extra current generated in this way is not too large, and meanwhile, the charger can be kept to work at a low current continuously.
Drawings
Fig. 1 is a circuit diagram of a first embodiment of a low current output circuit of a charger of the present invention;
fig. 2 is a circuit diagram of the second embodiment of the low current output circuit of the charger of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
the reference numbers in the drawings in the specification include a MOS transistor Q, a power source VCC, a first resistor R1, a second resistor R2, a third resistor R3, an indicator light L ED, a ground GND, a KEY switch SW, a flashlight function terminal KEY, a first input pin P1, a second input pin P2, and a first output pin P3.
Example one
As shown in FIG. 1, the low current output circuit of the charger baby comprises a battery management chip, a power source VCC, an indicator L ED and a switch, and further comprises a MOS transistor Q, a first resistor R13, a second resistor R8, a third resistor R9, a ground terminal GND and a control device, wherein the MOS transistor Q is an N-type MOS transistor.
The indicator light L ED is a flashlight L ED lamp with a charger, and in the embodiment, the indicator light L ED is replaced by a red L ED lamp, and the model is a Purui red L ED lamp bead manufactured by Shenzhen Qin Jia Fu Rui Lighting Limited company, and the switch is a key switch SW. and specifically is a flashlight switch with a charger.
The battery management chip comprises a flashlight function end KEY, the flashlight function end KEY is electrically connected with one end of a KEY switch SW, the other end of the KEY switch SW is electrically connected with one end of a second resistor R2, the other end of a second resistor R2 is grounded, the flashlight function end KEY is also electrically connected with the positive electrode of an indicator light L ED, the negative electrode of the indicator light L ED is electrically connected with one end of a third resistor R3, and the other end of the third resistor R3 is electrically connected with the ground end GND.
The D pole of the MOS transistor Q is electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to the power source VCC.
The S pole of the MOS tube Q is grounded, the G pole is electrically connected with the ungrounded end of the KEY switch SW, and the G pole is also connected with the functional end KEY of the flashlight.
In this embodiment, the first resistor R1 is 30 ohms, the second resistor R2 is 1000 ohms, and the third resistor R3 is 200 ohms. The model of the MOS tube Q is AO 3400.
The specific implementation process is as follows:
when the treasured that charges for outer equipment, if outer equipment that carries is bluetooth headset for the output current that charges for outer equipment that carries can be very little, carries the charging current very little promptly outward, under the normal condition, the treasured that charges can auto-power-off. In order to avoid the situation, when the output current for charging is very small, the KEY switch SW can be pressed to be closed, so that the voltage of the flashlight function end KEY of the battery management chip is 0V, after the power management chip detects 0V lasting for a certain time, the KEY switch SW can be judged to be pressed for a long time, a higher voltage can be output at the KEY end at the moment, the technology belongs to the prior art for opening the rechargeable flashlight, the related logic judgment also belongs to the prior art, and the description is omitted.
Because the G pole of the MOS transistor is electrically connected to the flashlight function terminal KEY, when the flashlight function terminal outputs a higher voltage, the MOS transistor Q is turned on, and then the first resistor R1 generates an extra current, the actual current identified by the battery management chip is the sum of the external charging current and the extra current, that is, the current identified by the battery management chip satisfies the current for normal charging.
Therefore, the charge pal can be charged normally without automatic shutdown. A continuous low current charging can be achieved.
For example, the automatic shutdown current of the charger baby is 100 milliamperes, the charging current of a low-current charging device is only 50 milliamperes, the charger baby is directly charged, and the charger baby can be automatically shut down; after an extra current of 90 milliamperes is added, the current detected by the battery management chip is larger than 100 milliamperes, the charger does not turn off the output, and then the charging is continuously carried out. When the charging equipment is fully charged and the charging current is reduced to a few milliamperes or even 0 milliampere, the total charging current is less than 100 milliamperes, and the charger can be automatically shut down.
When the functional end KEY of the flashlight outputs a higher voltage, namely the MOS tube is conducted, the indicator lamp L ED is conducted to emit light, whether the MOS tube Q is conducted or not can be known by observing the light emitting state of the indicator lamp L ED, and further whether the charger meets the condition of low-current charging or not can be known, except that, whether the circuit normally operates or not can be known by the indicator lamp L ED, if the KEY switch SW is pressed, the indicator lamp L ED is not lightened, the circuit is indicated to have problems, and the repair is needed.
By adopting the method and the device, when the external load output current is small, the charging can be continuously carried out. Moreover, the circuit structure can fully utilize the existing structure of the charger, and continuous low-current charging can be realized only by changing the circuit.
Example two
As shown in fig. 2, compared with the first embodiment, the present embodiment further includes a single chip microcomputer and a timer, and the model of the single chip microcomputer is STM 8L 051F 3.
The singlechip is connected with the power VCC electricity that the treasured that charges was taken certainly, and the singlechip is located between the G utmost point of flashlight function end and MOS pipe, and flashlight function end KEY is connected with the first input pin P1 electricity of singlechip, and the G utmost point of MOS pipe is connected with the first output pin P3 electricity of singlechip.
The positive electrode of the power supply end of the timer is electrically connected with the flashlight function end KEY, the negative electrode of the timer is electrically connected with the ground end GND, and the output end of the timer is electrically connected with the second input pin P2 of the single chip microcomputer. In this embodiment, the timer is a 555 timer.
The working process is as follows:
after the KEY switch is turned on, the flashlight function end KEY continuously sends a high level to the single chip microcomputer through a first input pin P1, so that the single chip microcomputer starts to work; meanwhile, the voltage output by the flashlight function end KEY enables the timer to start working, and the timer sends a high-level signal to the single chip microcomputer every X seconds through a second input pin P2 of the single chip microcomputer; the specific value of X can be set by those skilled in the art according to the time required for detecting the low current continuously when the charger is turned off automatically.
The singlechip receives the high level signal that the timer sent once, just sends a level of switching on through first output pin P3 for the G utmost point of MOS pipe and switches on the MOS pipe to provide an extra electric current for precious battery management chip that charges. Therefore, the battery management chip of the charge pal can be prevented from continuously receiving the low current and enabling the charge pal to automatically shut down. The single chip microcomputer outputs the conduction level of an MOS tube every time the single chip microcomputer receives a high level signal, wherein related programs belong to the prior art and are not described again. In other embodiments, the timer may also be a timing unit integrated in a single chip.
In this way, since the first resistor R1 is not always turned on, the power of the charger can be saved.
The above description is only for the embodiments of the present invention, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, and those skilled in the art will know all the common technical knowledge in the technical field of the present invention before the application date or the priority date, can know all the prior art in this field, and have the ability to apply the conventional experimental means before this date, and those skilled in the art can combine their own ability to perfect and implement the schemes, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. The charger low-current output circuit comprises a battery management chip, a power supply, an indicator light and a switch, wherein the battery management chip comprises a flashlight function end; the functional end of the flashlight is electrically connected with one end of the switch, and the other end of the switch is grounded; the functional end of the flashlight is also electrically connected with the anode of the indicator light, and the cathode of the indicator light is grounded;
the method is characterized in that: the MOS transistor further comprises a first resistor and an MOS transistor; the MOS tube is an N-type MOS tube; the D pole of the MOS tube is electrically connected with one end of a first resistor, and the other end of the first resistor is connected with a power supply; the S pole of the MOS tube is grounded; the G pole of the MOS tube is electrically connected with the ungrounded end of the switch, and the G pole of the MOS tube is also electrically connected with the functional end of the flashlight.
2. The charger baby low current output circuit according to claim 1, wherein: the switch is a key switch.
3. The charger baby low current output circuit according to claim 1, wherein: the key switch is grounded through the second resistor.
4. The charger baby low current output circuit according to claim 1, wherein: the negative pole of the indicator light is grounded through the third resistor.
5. The power bank low-current output circuit according to claim 4, wherein: the third resistance is 100-500 ohms.
6. The charger baby low current output circuit as claimed in claim 1, wherein the indicator light is L ED light.
7. The charger baby low-current output circuit as claimed in claim 6, wherein the L ED lamp is red in color.
8. The charger baby low current output circuit according to claim 1, wherein: the MOS tube is AO 3400.
9. The charger baby low current output circuit according to claim 1, wherein: the device also comprises a singlechip and a timer; the single chip microcomputer is electrically connected with a power supply of the charger, the single chip microcomputer is positioned between the flashlight function end and the G pole of the MOS tube, the flashlight function end is electrically connected with a first input pin of the single chip microcomputer, and the G pole of the MOS tube is electrically connected with a first output pin of the single chip microcomputer; the positive electrode of the power supply end of the timer is electrically connected with the functional end of the flashlight, the negative electrode of the timer is grounded, and the output end of the timer is electrically connected with the second input pin of the single chip microcomputer.
10. The charger baby low current output circuit according to claim 1, wherein: the first resistance is 10-50 ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922132040.2U CN211183457U (en) | 2019-12-02 | 2019-12-02 | Charger low current output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922132040.2U CN211183457U (en) | 2019-12-02 | 2019-12-02 | Charger low current output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211183457U true CN211183457U (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922132040.2U Expired - Fee Related CN211183457U (en) | 2019-12-02 | 2019-12-02 | Charger low current output circuit |
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| Country | Link |
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| CN (1) | CN211183457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114461000A (en) * | 2022-01-14 | 2022-05-10 | 深圳市卡贝电子技术有限公司 | Low-power-consumption maintaining circuit, control method and adapter |
-
2019
- 2019-12-02 CN CN201922132040.2U patent/CN211183457U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114461000A (en) * | 2022-01-14 | 2022-05-10 | 深圳市卡贝电子技术有限公司 | Low-power-consumption maintaining circuit, control method and adapter |
| CN114461000B (en) * | 2022-01-14 | 2023-11-24 | 深圳市卡贝电子技术有限公司 | Low-power consumption maintaining circuit, control method and adapter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200804 Termination date: 20201202 |