CN212063540U - Novel dual-input charging circuit with USB mobile phone charging function - Google Patents
Novel dual-input charging circuit with USB mobile phone charging function Download PDFInfo
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- CN212063540U CN212063540U CN202020758622.1U CN202020758622U CN212063540U CN 212063540 U CN212063540 U CN 212063540U CN 202020758622 U CN202020758622 U CN 202020758622U CN 212063540 U CN212063540 U CN 212063540U
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Abstract
The utility model discloses a novel dual input charging circuit with USB cell-phone function of charging, including power management chip, lithium battery charging management chip, MICRO USB input socket, USB output interface and battery portion, the charging input voltage input pin of power management chip is connected with MICRO USB input socket's positive pole, the ground connection pin of power management chip is connected with MICRO USB input socket's negative pole input pin, the conversion pin mouth of power management chip is connected with the positive pole of battery portion through first inductance, the negative pole of battery portion is connected with USB output interface's negative pole, the output voltage pin that steps up of power management chip is connected with USB output interface's positive pole. The utility model discloses a novel dual input charging circuit with USB cell-phone function of charging, this circuit adopt dual input to receive input voltage too high and lead to the unusual function appearance when avoiding solar panel to charge.
Description
Technical Field
The utility model relates to a mobile phone charging circuit, in particular to novel dual input charging circuit with USB mobile phone charging function.
Background
At present, some small household appliances in the market are products with MICRO USB socket input for power supply or charging, the standard of the socket is default direct current 5V voltage input according to normal, and when a terminal customer requires the product to charge and supply power by sharing the MICRO USB socket by the solar panel and the external adapter, the product is continuously required to have a USB output mobile phone charging function. The circuit working voltage of the existing charging circuit under the condition that only a power management chip exists is 4.3V-5.5V, according to the characteristic that a solar panel is connected into the circuit, the voltage of the solar panel at the moment of power-on under load is very high (sometimes can exceed 5.5V), if the solar panel normally charges the product, a cloud or a shadow in the sky flows over the solar panel, so that the solar panel outputs no-load voltage at the moment to cause the voltage to be too high, the overvoltage protection of the power management chip can be directly caused to not work, and the product does not have charging current at the moment, so that the function has a defect.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a novel dual input charging circuit with USB cell-phone function of charging, this circuit adopts dual input to receive input voltage too high and lead to the unusual function appearance when avoiding solar panel to charge.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a novel double-input charging circuit with a USB mobile phone charging function comprises a power supply management chip, a lithium battery charging management chip, a MICRO USB input socket, a USB output interface and a battery part, wherein a charging input voltage input pin of the power supply management chip is connected with the anode of the MICRO USB input socket, a grounding pin of the power supply management chip is connected with a cathode input pin of the MICRO USB input socket, a conversion pin port of the power supply management chip is connected with the anode of the battery part through a first inductor, the cathode of the battery part is connected with the cathode of the USB output interface, a boosting output voltage pin of the power supply management chip is connected with the anode of the USB output interface, the charging input voltage pin of the lithium battery charging management chip is respectively connected with the anode of the MICRO USB input socket, a charging current adjusting pin of the lithium battery charging management chip is connected with the cathode of the MICRO USB input socket through an eleventh resistor, the charging indication pin of the lithium battery charging management chip is connected with the negative electrode of the MICRO USB input socket after being in short circuit with the grounding pin, and the battery connection pin of the lithium battery charging management chip is connected with the positive electrode of the battery part through the twelfth resistor.
Furthermore, a charging input voltage input pin of the power management chip is connected with an anode of the LED indicator lamp through a fourth resistor.
Furthermore, a fourth capacitor and a fifth capacitor are respectively connected in parallel between the boost output voltage pin of the power management chip and the negative electrode of the USB output interface.
Furthermore, a third resistor and a first capacitor are connected in parallel between the charging input voltage input pin and the grounding pin of the power management chip.
Furthermore, a seventh resistor is connected between the charging input voltage pin of the lithium battery charging management chip and the anode of the MICRO USB input socket, the two ends of the seventh resistor are connected with eighth resistors, and a second capacitor is connected in parallel between the charging input voltage pin of the lithium battery charging management chip and the grounding end.
Further, the model of the power management chip is AT 3502.
Further, the lithium battery charging management chip is BM 4054.
By adopting the circuit scheme, the lithium battery charging management chip and the peripheral circuit thereof are designed and added on the basis of the existing power management chip, the lithium battery charging management chip ensures that the MICRO USB input socket charges the battery part from another way, the defect of the overvoltage protection function of the existing circuit with only the power management chip is compensated, and the circuit adopts double-way input to avoid the abnormal function caused by overhigh input voltage when the solar panel is charged.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in FIG. 1, the utility model discloses a novel dual-input charging circuit with USB mobile phone charging function, comprising a power management chip U1, a lithium battery charging management chip U2, a MICRO USB input socket 1, a USB output interface 2 and a battery part BT, wherein a charging input voltage input pin VDD of the power management chip U1 is connected with the positive pole of the MICRO USB input socket 1, a grounding pin GND of the power management chip U1 is connected with the negative input pin of the MICRO USB input socket 1, a switching pin port SW of the power management chip U1 is connected with the positive pole of the battery part through a first inductor L1, the negative pole of the battery part BT is connected with the negative pole of the USB output interface BT 2, a boosting output voltage pin OUT of the power management chip U1 is connected with the positive pole of the USB output interface 2, a charging input voltage pin VCC1 of the lithium battery charging management chip U2 is respectively connected with the positive pole of the MICRO USB input socket 1, the charging current adjusting pin Prog of the lithium battery charging management chip U2 is connected to the negative electrode of the MICRO USB input socket 1 through an eleventh resistor R11, the eleventh resistor R11 therein adjusts the magnitude of the charging current, the charging indication pin CHG of the lithium battery charging management chip U2 is short-circuited with the ground pin GND1 and then connected to the negative electrode of the MICRO USB input socket 1, and the battery connection pin of the lithium battery charging management chip U2 is connected to the positive electrode of the battery unit BT through a twelfth resistor R12. The power management chip U1 in the circuit scheme adopts an AT3502 chip, and the lithium battery charging management chip U2 adopts a BM4054 chip.
The MICRO USB input socket 1 is an interface for connecting external power supply, and the USB output interface 2 is a charging power supply port of a mobile phone.
The power management chip U1 adopts the circuit charging current of the chip of AT3502 to be 0.8A, so that a quick charging time can be realized for the battery unit BT, customers with requirements on the charging time can greatly meet the requirements, and a product capable of achieving quick charging can more easily attract the requirements of the customers on the product; in addition, the power management chip U1 also internally sets the discharge output to be 5V/1A, the USB mobile phone can be charged and used, the power consumption of the power management chip U1 is low in efficiency and high in efficiency in the process of input charging or output charging, and the surface temperature of the whole element is within a control range (less than 80 degrees).
The circuit is designed and added with a lithium battery charging management chip U2 and a peripheral circuit thereof on the basis of an existing power management chip U1, the lithium battery charging management chip U2 ensures that a MICRO USB input socket 1 charges a battery BT from another way, the defect of the overvoltage protection function of the existing circuit with the power management chip U1 is overcome, and the circuit adopts double-way input to avoid the abnormal occurrence of the function caused by overhigh input voltage when a solar panel is charged.
The charging input voltage input pin VDD of the power management chip U1 is connected to the anode of the LED indicator light 3 through the fourth resistor R4, so that the user can determine the power condition of the battery BT according to the color of the indicator light.
A fourth capacitor C4 and a fifth capacitor C5 are respectively connected in parallel between the boost output voltage pin OUT of the power management chip U1 and the negative electrode of the USB output interface 2, and current ripple regulation before the two capacitor voltages connected in parallel at the position output the USB output interface 2 is smoother and then output, so that the input current is more stable when the mobile phone is charged.
A third resistor R3 and a first capacitor C1 are connected in parallel between the charging input voltage input pin VDD and the ground pin of the power management chip U1, and are controlled by the optional AT 3502.
A seventh resistor R7 is connected between the charging input voltage pin VCC1 of the lithium battery charging management chip U2 and the anode of the MICRO USB input socket 1, an eighth resistor R8 is connected to both ends of the seventh resistor R7, and a second capacitor C2 is connected in parallel between the charging input voltage pin VCC1 of the lithium battery charging management chip U2 and the ground terminal, where the filtering and transient voltage buffering function are performed on the chip input pin of the BM4054 charged by the battery BT.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (7)
1. The utility model provides a novel dual input charging circuit with USB cell-phone function of charging, includes power management chip, lithium battery charging management chip, MICRO USB input socket, USB output interface and battery portion, its characterized in that: the charging input voltage input pin of the power management chip is connected with the anode of the MICRO USB input socket, the grounding pin of the power management chip is connected with the cathode input pin of the MICRO USB input socket, the conversion pin port of the power management chip is connected with the anode of the battery part through the first inductor, the cathode of the battery part is connected with the cathode of the USB output interface, the boost output voltage pin of the power management chip is connected with the anode of the USB output interface, the charging input voltage pin of the lithium battery charging management chip is respectively connected with the anode of the MICRO USB input socket, the charging current regulation pin of the lithium battery charging management chip is connected with the cathode of the MICRO USB input socket through the eleventh resistor, the charging indication pin of the lithium battery charging management chip is connected with the cathode of the MICRO USB input socket after being short-circuited with the grounding pin, and a battery connecting pin of the lithium battery charging management chip is connected with the anode of the battery part through a twelfth resistor.
2. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: and a charging input voltage input pin of the power management chip is connected with the anode of the LED indicator lamp through a fourth resistor.
3. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: and a fourth capacitor and a fifth capacitor are respectively connected in parallel between the boost output voltage pin of the power management chip and the negative electrode of the USB output interface.
4. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: and a third resistor and a first capacitor are connected in parallel between the charging input voltage input pin and the grounding pin of the power management chip.
5. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: and a seventh resistor is connected between the charging input voltage pin of the lithium battery charging management chip and the anode of the MICRO USB input socket, the two ends of the seventh resistor are connected with eighth resistors, and a second capacitor is connected in parallel between the charging input voltage pin of the lithium battery charging management chip and the grounding end.
6. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: the model of the power management chip is AT 3502.
7. The novel dual-input charging circuit with the USB mobile phone charging function according to claim 1, wherein: the lithium battery charging management chip is BM 4054.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020758622.1U CN212063540U (en) | 2020-05-07 | 2020-05-07 | Novel dual-input charging circuit with USB mobile phone charging function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020758622.1U CN212063540U (en) | 2020-05-07 | 2020-05-07 | Novel dual-input charging circuit with USB mobile phone charging function |
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| Publication Number | Publication Date |
|---|---|
| CN212063540U true CN212063540U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020758622.1U Active CN212063540U (en) | 2020-05-07 | 2020-05-07 | Novel dual-input charging circuit with USB mobile phone charging function |
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| Country | Link |
|---|---|
| CN (1) | CN212063540U (en) |
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2020
- 2020-05-07 CN CN202020758622.1U patent/CN212063540U/en active Active
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