CN212063538U - Low-power-consumption USB charging circuit for low-voltage input - Google Patents
Low-power-consumption USB charging circuit for low-voltage input Download PDFInfo
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- CN212063538U CN212063538U CN202020737695.2U CN202020737695U CN212063538U CN 212063538 U CN212063538 U CN 212063538U CN 202020737695 U CN202020737695 U CN 202020737695U CN 212063538 U CN212063538 U CN 212063538U
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Abstract
The utility model discloses a low-power consumption USB charging circuit for low pressure input, including lithium cell portion and USB interface, the positive pole of lithium cell portion is connected with the positive pole of first diode, the negative pole of first diode is connected with first current input circuit and second current input circuit, first current input circuit includes third triode, first resistance and second resistance, second current input circuit includes sixth resistance and voltage stabilizing module, the projecting pole, collecting electrode and the base of third triode are connected with the negative pole of first diode, second resistance and voltage stabilizing module's input, second resistance parallel connection has first resistance, voltage stabilizing module's input is the sixth resistance of establishing ties still. The utility model discloses a low-power consumption USB charging circuit for low voltage input, this circuit cost is lower, uses on the lithium cell control electrical products of low voltage input.
Description
Technical Field
The utility model relates to a small household appliances circuit field, in particular to low-power consumption USB charging circuit for low pressure input.
Background
At present, some small household appliances in the market are charged by a mobile phone with USB output, for example, 6V-24V input, most of 5V output charging designs are designed by adopting a voltage reduction circuit, if the voltage reduction circuit is adopted for design, electronic elements are more, a circuit matched with a voltage reduction chip is used for manufacturing, the cost is high, and if the voltage reduction circuit is used for low-voltage input, the low-voltage (5V) output charging is difficult to realize. A low-cost circuit scheme for charging with high-voltage input (7.4V lithium battery input) and low-voltage output (5V) is needed in the market.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a low-power consumption USB charging circuit for low voltage input, this circuit cost is lower, uses on low voltage input's lithium cell control electrical products.
In order to solve the technical problem, the utility model discloses a technical scheme does:
the utility model provides a low-power consumption USB charging circuit for low pressure input, includes lithium battery portion and USB interface, the positive pole of lithium battery portion is connected with the positive pole of first diode, the negative pole of first diode is connected with first current input circuit and second current input circuit, first current input circuit includes third triode, first resistance and second resistance, second current input circuit includes sixth resistance and voltage stabilizing module, the projecting pole, collecting electrode and the base of third triode are connected with the negative pole of first diode, second resistance and voltage stabilizing module's input, the second resistance is parallelly connected to have first resistance, voltage stabilizing module's input still establishes ties sixth resistance.
Further, the voltage stabilizing module comprises a voltage stabilizing chip, a first capacitor, a second capacitor, a seventh resistor and a third capacitor, a voltage input pin of the voltage stabilizing chip is connected with the first capacitor in parallel with the negative electrode of the lithium battery part, a voltage output pin of the voltage stabilizing chip is connected with the second capacitor and the third capacitor in parallel with the negative electrode of the lithium battery part, and the seventh resistor is connected between the second capacitor and the third capacitor.
Further, a fourth capacitor is connected in parallel between the cathode of the first diode and the negative electrode of the lithium battery part.
Further, the third triode is a PNP triode.
Further, the resistance value of the sixth resistor is 330 Ω.
Further, the model of the voltage stabilizing chip is 6208.
By adopting the technical scheme, the lithium battery part outputs 7.4V voltage, the lithium battery part is directly connected with the first diode, the lithium battery current shunts the first current input circuit and the second current input circuit, the first current input circuit is high-current input, the second current input circuit is small-circuit input, the circuit does not have a circuit matched with a voltage reduction chip when inputting voltage, the overall cost of the circuit is saved, and the power consumption of the circuit is lower when not having a load.
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.
The utility model provides a low-power consumption USB charging circuit for low pressure input, including lithium battery portion 1 and USB interface 2, the positive pole of lithium battery portion 1 is connected with the positive pole of first diode D1, the negative pole of first diode D1 is connected with first current input circuit 3 and second current input circuit 4, first current input circuit 3 includes third triode Q3, first resistance R1 and second resistance R2, second current input circuit 4 includes sixth resistance R6 and voltage stabilization module, third triode Q3 is the PNP triode, the projecting pole, the collecting electrode and the base of third triode Q3 are connected with the negative pole of first diode D1, the input of second resistance R2 and voltage stabilization module, second resistance R2 is parallelly connected with first resistance R1, the input of voltage stabilization module still connects in series with sixth resistance R6.
The voltage stabilizing module comprises a voltage stabilizing chip U1, a first capacitor C1, a second capacitor C2, a seventh resistor R7 and a third capacitor C3, a voltage input pin of the voltage stabilizing chip U1 and the negative electrode of the lithium battery part 1 are connected in parallel with the first capacitor C1, a voltage output pin of the voltage stabilizing chip U1 and the negative electrode of the lithium battery part 1 are connected in parallel with the second capacitor C2 and the third capacitor C3, and the seventh resistor R7 is connected between the second capacitor C2 and the third capacitor C3.
The lithium battery part 1 is a structure in which two 3.7V lithium batteries are connected in parallel, and according to the characteristics of the lithium batteries: in the application circuit, the over-discharge voltage of the lithium battery is 6V, the 6V is not over-discharged for the USB interface 2 output mobile phone, the over-charge voltage is 8.4V, and the over-charge voltage can play a role in the USB interface 2 output charging, namely the highest input voltage of the circuit is 8.4V.
The model of the voltage stabilizing chip U1 is 6208, the current input by the lithium battery part 1 passes through the first diode D1 and then provides the input voltage for the voltage stabilizing chip U16280 through the sixth resistor R6 from the second current input circuit 4, a fourth capacitor C4 is connected in parallel between the cathode of the first diode D1 and the cathode of the lithium battery part 1, the fourth capacitor C4 and the first capacitor C1 are favorable for the filtering function at the input end, the voltage stabilizing chip U1 outputs 5V voltage, the voltage is output and then passes through the seventh resistor R7 to the USB interface 2, and the voltage stabilizing output ends of the second capacitor C2 and the third capacitor C3 play a role in filtering. The lithium battery part 1 passes through the first diode D1, the first current input circuit 3 passes through the third triode Q3, the third triode Q3 is conducted, and then the first resistor R1 and the second resistor R2 are connected to the USB interface 2.
The input end passes through the second current input circuit 4 to the USB interface 2, a small current is designed to pass through, the value of the sixth resistor R6 of the first current input circuit 3 is determined by the saturation conduction of the third triode Q3 in the second current input circuit 4, when the value of the sixth resistor R6 in the circuit is 330 Ω, the third triode Q3 has a current of 2mA conduction, and the value of the seventh resistor R7 is also designed more necessarily, because it determines the power consumption of the regulator chip U16208, if the seventh resistor R7 is not provided, under the condition that the USB interface 2 is loaded, the voltage difference of the regulator chip U1 becomes large, the working temperature is higher, and the heat is more likely to exceed the normal temperature range. The seventh resistor R7 has a resistance of 10 Ω or less, and if the USB interface 2 is loaded and the output voltage is 4.8V, the voltage difference of the seventh resistor R7 is 0.2V, so that the current flowing through the second current input circuit 4 is about 20mA, and it is not too large that the current flowing through the regulator chip U1 is controlled, otherwise, the current will overheat during the charging and outputting of the USB mobile phone.
The high current is designed to pass from the input end to the USB interface 2 through the second current input circuit 4, the main voltage difference in the second current input circuit 4 is located in the first resistor R1 and the second resistor R2, the output current of the USB interface 2 is controlled by the voltage difference of the resistors, when the highest voltage of 8.4V is input, the current of the second current input circuit 4 is about 500mA approximately according to the load of 4.7V of the USB interface 2, in order to control the temperature of electronic components not to be too high, the third triode Q3 in the high-current second current input circuit 4 can be a component with the model D882, and the power resistor is designed by connecting two 3W/15 omega in parallel, so that the value can be smaller, and the larger output current of the USB interface can be designed.
The circuit does not have a circuit matched with a voltage reduction chip when voltage is input, so that the overall cost of the circuit is saved, and the power consumption of the circuit is lower when the circuit does not have a load.
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 (6)
1. The utility model provides a low-power consumption USB charging circuit for low pressure is imported, includes lithium cell portion and USB interface, its characterized in that: the positive pole of lithium battery portion is connected with the positive pole of first diode, the negative pole of first diode is connected with first current input circuit and second current input circuit, first current input circuit includes third triode, first resistance and second resistance, second current input circuit includes sixth resistance and voltage stabilizing module, the projecting pole, the collecting electrode and the base of third triode are connected with the negative pole of first diode, the input of second resistance and voltage stabilizing module, the input of voltage stabilizing module still establishes ties sixth resistance.
2. A low power USB charging circuit for low voltage input according to claim 1 wherein: the voltage stabilizing module comprises a voltage stabilizing chip, a first capacitor, a second capacitor, a seventh resistor and a third capacitor, a voltage input pin of the voltage stabilizing chip is connected with the first capacitor in parallel with the negative electrode of the lithium battery part, a voltage output pin of the voltage stabilizing chip is connected with the second capacitor and the third capacitor in parallel with the negative electrode of the lithium battery part, and the seventh resistor is connected between the second capacitor and the third capacitor.
3. A low power USB charging circuit for low voltage input according to claim 1 wherein: and a fourth capacitor is connected in parallel between the cathode of the first diode and the negative electrode of the lithium battery part.
4. A low power USB charging circuit for low voltage input according to claim 1 wherein: the third triode is a PNP triode.
5. A low power USB charging circuit for low voltage input according to claim 1 wherein: the resistance value of the sixth resistor is 330 Ω.
6. A low power USB charging circuit for low voltage input according to claim 2 wherein: the model of the voltage stabilizing chip is 6208.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020737695.2U CN212063538U (en) | 2020-05-07 | 2020-05-07 | Low-power-consumption USB charging circuit for low-voltage input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020737695.2U CN212063538U (en) | 2020-05-07 | 2020-05-07 | Low-power-consumption USB charging circuit for low-voltage input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212063538U true CN212063538U (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020737695.2U Active CN212063538U (en) | 2020-05-07 | 2020-05-07 | Low-power-consumption USB charging circuit for low-voltage input |
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| Country | Link |
|---|---|
| CN (1) | CN212063538U (en) |
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- 2020-05-07 CN CN202020737695.2U patent/CN212063538U/en active Active
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