Low-power-consumption USB output charging circuit based on USB switch pin control

Abstract

The utility model provides a low-power-consumption USB output charging circuit based on USB switch pin control, which belongs to the field of electricity and comprises a USB charging output port, a boost management module, a switch module and a direct-current power supply input end. The USB charging output port comprises a first output pin, a second output pin and a third output pin, and the second output pin is grounded; the output end of the boost management module is electrically connected with the first output pin; the switch module comprises a PMOS (P-channel Metal Oxide Semiconductor) tube, the grid electrode of the PMOS tube is electrically connected with the third output pin, and the drain electrode of the PMOS tube is electrically connected with the input end of the boost management module; the direct-current power supply input end is electrically connected with the source electrode of the PMOS tube; wherein when a power line is connected to the USB charging output port, the second output pin is electrically connected with the third output pin, and the boost management module is controlled to work, the power consumption can be well reduced, so that the problem of electric leakage of a battery product is solved.

Description

Technical Field

[0001] The present application relates to the field of electricity, and in particular to a low-power USB output charging circuit based on USB switch pin control. Background Art

[0002] At present, some products with built-in lithium batteries, such as power banks, are prone to leakage when in standby mode. In order to ensure a longer standby time, the circuit needs to be processed with low power consumption. The existing technology usually uses software design control to achieve low power consumption processing. For example, when in standby mode, a shutdown signal is used to put the MCU into a sleep state to reduce power consumption. However, during sleep mode, the MCU still runs at a low speed. In addition, due to external interference, the MCU may be mistakenly awakened, thereby increasing the power consumption of the MCU.

[0003] Compared with the technology of implementing low-power processing for lithium battery products through software design, the technology of implementing low-power processing for lithium battery products through pure hardware design is less likely to cause false triggering and increase in power consumption, and is more conducive to reducing power consumption.

[0004] Therefore, in order to better reduce the power consumption of lithium battery products, it is urgent to design a USB output charging circuit with lower power consumption and capable of avoiding false triggering. Utility Model Content

[0005] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a low-power USB output charging circuit based on USB switch pin control. Compared with the method of low-power processing of lithium battery products by software control, the use of pure hardware control can better reduce power consumption to solve the leakage problem of battery products.

[0006] To achieve the above-mentioned purpose, the embodiment of the present application proposes a low-power USB output charging circuit based on USB switch pin control, comprising: a USB charging output port, a boost management module, a switch module and a DC power input terminal;

[0007] The USB charging output port comprises a first output pin, a second output pin and a third output pin, and the second output pin is grounded;

[0008] The output end of the boost management module is electrically connected to the first output pin;

[0009] The switch module comprises a PMOS tube, a gate of the PMOS tube is electrically connected to the third output pin, and a drain of the PMOS tube is electrically connected to an input end of the boost management module;

[0010] The DC power supply input terminal is electrically connected to the source of the PMOS tube;

[0011] When the USB charging output port is connected to a power line, the second output pin is electrically connected to the third output pin to control the boost management module to operate.

[0012] A low-power USB output charging circuit based on USB switch pin control provided by an embodiment of the utility model has at least the following beneficial effects: the third output pin in the USB charging output port serves as a switch pin, and the third output pin of the USB charging output port is electrically connected to the gate of the PMOS tube in the switch module. When the USB charging output port is connected to the power line, the second output pin is electrically connected to the third output pin. Since the second output pin is grounded, the level of the third output pin is pulled down, thereby turning on the PMOS tube. Since the drain of the PMOS tube is electrically connected to the input end of the boost management module, the DC power input end provides power to the boost management module through the PMOS tube, so that the boost management module works, and then outputs the boosted voltage to the first output pin of the USB charging output port.

[0013] In some embodiments, the switch module also includes a first resistor and a second resistor, one end of the first resistor is electrically connected to the source of the PMOS tube, the other end of the first resistor is electrically connected to the gate of the PMOS tube, one end of the second resistor is electrically connected to the gate of the PMOS tube, and the other end of the second resistor is electrically connected to the third output pin of the USB charging output port.

[0014] In some embodiments, the boost management module includes a boost DC-DC control module, a diode, an inductor, a first capacitor, a second capacitor, a current regulation module, an NMOS tube and a voltage regulation module. The boost DC-DC control module is electrically connected to one end of the inductor, one end of the first capacitor, the output end of the voltage regulation module, the drain of the NMOS tube and the gate of the NMOS tube, respectively. The input end of the voltage regulation module is electrically connected to the negative electrode of the diode, the first output pin of the USB charging output port and one end of the second capacitor, respectively. The other end of the inductor is electrically connected to the positive electrode of the diode and the source of the NMOS tube, respectively. The other end of the second capacitor is electrically connected to the current regulation module, and the other end of the first capacitor is grounded.

[0015] In some embodiments, the boost DC-DC control module includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin serves as an input end of the boost management module, one end of the second capacitor serves as an output end of the boost management module, the drain of the PMOS tube is electrically connected to the first pin, one end of the inductor, one end of the first capacitor and the fourth pin respectively, the second pin is grounded, the third pin is electrically connected to the output end of the voltage regulation module, the fifth pin is electrically connected to the drain of the NMOS tube, and the sixth pin is electrically connected to the gate of the NMOS tube.

[0016] In some embodiments, the voltage regulating module includes a third resistor and a fourth resistor, one end of the third resistor is electrically connected to the negative electrode of the diode as the input end of the voltage regulating module, the other end of the third resistor is electrically connected to one end of the fourth resistor and the third pin as the output end, and the other end of the fourth resistor is grounded.

[0017] In some embodiments, the voltage regulation module further includes a fifth resistor, and the fifth resistor is connected in parallel with the third resistor.

[0018] In some embodiments, the current regulating module includes a sixth resistor and a seventh resistor, one end of the sixth resistor is electrically connected to the other end of the fourth resistor and the other end of the second capacitor, respectively, the other end of the sixth resistor is electrically connected to the second output pin of the USB charging output port, and the seventh resistor is connected in parallel with the sixth resistor.

[0019] In some embodiments, the sixth resistor and the seventh resistor are both zero-ohm resistors.

[0020] In some embodiments, the first capacitor and the second capacitor have the same capacitance.

[0021] In some embodiments, the boost management module further includes an eighth resistor, one end of the eighth resistor is electrically connected to the drain of the NMOS tube, and the other end of the eighth resistor is electrically connected to the gate of the NMOS tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0024] Figure 1This is a system architecture diagram of a low-power USB output charging circuit based on USB switch pin control provided by an embodiment of the utility model;

[0025] Figure 2 This is an overall schematic diagram of a low-power USB output charging circuit based on USB switch pin control provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0027] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0028] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0029] At present, some products with built-in lithium batteries, such as power banks, are prone to leakage when in standby mode. In order to ensure a longer standby time, the circuit needs to be processed with low power consumption. The existing technology usually uses software design control to achieve low power consumption processing. For example, when in standby mode, a shutdown signal is used to put the MCU into a sleep state to reduce power consumption. However, during sleep mode, the MCU still runs at a low speed. In addition, due to external interference, the MCU may be mistakenly awakened, thereby increasing the power consumption of the MCU.

[0030] Compared with the technology of implementing low-power processing for lithium battery products through software design, the technology of implementing low-power processing for lithium battery products through pure hardware design is less likely to cause false triggering and increase in power consumption, and is more conducive to reducing power consumption.

[0031] Therefore, in order to better reduce the power consumption of lithium battery products, it is urgent to design a USB output charging circuit with lower power consumption and capable of avoiding false triggering.

[0032] Based on this, an embodiment of the utility model provides a low-power USB output charging circuit based on USB switch pin control. Compared with the method of using software control to perform low-power processing on lithium battery products, the use of pure hardware control can better reduce power consumption to solve the leakage problem of battery products.

[0033] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0034] Reference Figure 1 , Figure 2 , the utility model provides a low-power USB output charging circuit based on USB switch pin control, comprising: a USB charging output port P1, a boost management module 200, a switch module 100 and a DC power input terminal B+;

[0035] The USB charging output port P1 includes a first output pin 1, a second output pin 4 and a third output pin 5, and the second output pin 4 is grounded;

[0036] The output end of the boost management module 200 is electrically connected to the first output pin 1;

[0037] The switch module 100 includes a PMOS transistor Q1, a gate of the PMOS transistor Q1 is electrically connected to the third output pin 5, and a drain of the PMOS transistor Q1 is electrically connected to the input end of the boost management module 200;

[0038] The DC power input terminal B+ is electrically connected to the source of the PMOS tube Q1;

[0039] When the USB charging output port P1 is connected to a power line, the second output pin 4 is electrically connected to the third output pin 5 , and the boost management module 200 is controlled to operate.

[0040] According to a low-power USB output charging circuit based on USB switch pin control provided by an embodiment of the utility model, the third output pin 5 in the USB charging output port P1 is used as a switch pin, and the third output pin 5 of the USB charging output port P1 is electrically connected to the gate of the PMOS tube Q1 in the switch module 100. When the USB charging output port P1 is connected to the power line, the second output pin 4 is electrically connected to the third output pin 5. Since the second output pin 4 is grounded, the level of the third output pin 5 is pulled low, thereby turning on the PMOS tube Q1. Since the drain of the PMOS tube Q1 is electrically connected to the input end of the boost management module 200, the DC power input end B+ provides power to the boost management module 200 through the PMOS tube Q1, so that the boost management module 200 works, and then outputs the boosted voltage to the first output pin 1 of the USB charging output port P1.

[0041] It is understandable that since most built-in lithium battery products are equipped with a USB output charging port, using the switch pin of the USB output charging port to directly control the output charging function can be adapted to more built-in lithium battery products.

[0042] It can be understood that when the power cord is unplugged from the USB charging output port P1, the second output pin 4 is disconnected from the third output pin 5, the PMOS tube Q1 is cut off, and the DC power input terminal B+ cannot supply power to the boost management module 200, so that the boost management module 200 is in a zero power consumption state, which can better solve the leakage problem of the battery.

[0043] Reference Figure 2 In some embodiments, the switch module 100 further includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is electrically connected to the source of the PMOS tube Q1, the other end of the first resistor R1 is electrically connected to the gate of the PMOS tube Q1, one end of the second resistor R2 is electrically connected to the gate of the PMOS tube Q1, and the other end of the second resistor R2 is electrically connected to the third output pin 5 of the USB charging output port P1.

[0044] Preferably, the resistance of the first resistor R1 is 330k, and the resistance of the second resistor R2 is 10k.

[0045] Reference Figure 2 In some embodiments, the boost management module 200 includes a boost DC-DC control module U1, a diode D1, an inductor L1, a first capacitor C1, a second capacitor C2, a current regulation module 220, an NMOS tube Q2 and a voltage regulation module 210. The boost DC-DC control module U1 is electrically connected to one end of the inductor L1, one end of the first capacitor C1, the output end of the voltage regulation module 210, the drain of the NMOS tube Q2 and the gate of the NMOS tube Q2 respectively. The input end of the voltage regulation module 210 is electrically connected to the cathode of the diode D1, the first output pin 1 of the USB charging output port P1 and one end of the second capacitor C2 respectively. The other end of the inductor L1 is electrically connected to the anode of the diode D1 and the source of the NMOS tube Q2 respectively. The other end of the second capacitor C2 is electrically connected to the current regulation module 220, and the other end of the first capacitor C1 is grounded.

[0046] Reference Figure 2In some embodiments, the boost DC-DC control module U1 includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin serves as an input end of the boost management module 200, one end of the second capacitor C2 serves as an output end of the boost management module 200, the drain of the PMOS tube Q1 is electrically connected to the first pin, one end of the inductor L1, one end of the first capacitor C1 and the fourth pin respectively, the second pin is grounded, the third pin is electrically connected to the output end of the voltage regulation module 210, the fifth pin is electrically connected to the drain of the NMOS tube Q2, and the sixth pin is electrically connected to the gate of the NMOS tube Q2.

[0047] Preferably, the inductance of the inductor L1 is 3.3uH, the capacitance of the first capacitor C1 is 47uf, and the capacitance of the second capacitor C2 is 47uf.

[0048] It should be noted that the first capacitor C1 is used as an input capacitor, and the boost DC-DC control module U1 is connected to the first capacitor C1 to effectively reduce the power supply impedance. The second capacitor C2 is used as an output capacitor, and the boost DC-DC control module U1 is connected to the second capacitor C2 to effectively smooth the output voltage.

[0049] It should be noted that the boost DC-DC control module U1 is externally connected to an NMOS tube Q2, and the NMOS tube Q2 is electrically connected to the other end of the inductor L1. When the NMOS tube Q2 is turned on, it can accumulate energy in the inductor L1. When the NMOS tube Q2 is turned off, it can release the current accumulated in the inductor L1. The released current accumulates in the second capacitor C2 and becomes a voltage, so that the potential of the output end of the boost DC-DC control module U1 rises, and the current is released to the first output pin 1 of the USB charging output port P1 through the diode D1.

[0050] Reference Figure 2 In some embodiments, the voltage regulating module 210 includes a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is electrically connected to the cathode of the diode D1 as the input end of the voltage regulating module 210, the other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4 and the third pin as the output end, and the other end of the fourth resistor R4 is grounded.

[0051] Preferably, the resistance of the third resistor R3 is 30k, and the resistance of the fourth resistor R4 is 10k.

[0052] It should be noted that the third pin is a feedback voltage input pin. When the potential of the output end of the boost DC-DC control module U1 rises, the current is released to the voltage regulation module 210 through the diode D1. The output end of the voltage regulation module 210 is electrically connected to the third pin. When the voltage of the third pin is the same as the internal reference voltage potential of the boost DC-DC control module U1, the potential of the output end of the boost DC-DC control module U1 stops rising.

[0053] It should be noted that by connecting a suitable diode D1, an inductor L1, a first capacitor C1, a second capacitor C2, a current regulation module 220, an NMOS tube Q2 and a voltage regulation module 210 to the boost DC-DC control module U1, a 5V charging voltage can be stably output to the USB charging output port P1.

[0054] Reference Figure 2 In some embodiments, the voltage regulating module 210 further includes a fifth resistor R5, and the fifth resistor R5 is connected in parallel with the third resistor R3.

[0055] Reference Figure 2 In some embodiments, the current regulating module 220 includes a sixth resistor R6 and a seventh resistor R7, one end of the sixth resistor R6 is electrically connected to the other end of the fourth resistor R4 and the other end of the second capacitor C2, respectively, the other end of the sixth resistor R6 is electrically connected to the second output pin 4 of the USB charging output port P1, and the seventh resistor R7 is connected in parallel with the sixth resistor R6.

[0056] Reference Figure 2 In some embodiments, the sixth resistor R6 and the seventh resistor R7 are both zero ohm resistors.

[0057] Reference Figure 2 In some embodiments, the capacitance of the first capacitor C1 is the same as that of the second capacitor C2.

[0058] Reference Figure 2 In some embodiments, the boost management module 200 further includes an eighth resistor R8, one end of the eighth resistor R8 is electrically connected to the drain of the NMOS tube Q2, and the other end of the eighth resistor R8 is electrically connected to the gate of the NMOS tube Q2.

[0059] Preferably, the resistance of the eighth resistor R8 is 10k.

[0060] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A low-power USB output charging circuit based on USB switch pin control, characterized in that: include: A USB charging output port, the USB charging output port comprising a first output pin, a second output pin and a third output pin, the second output pin being grounded; A boost management module, wherein an output end of the boost management module is electrically connected to the first output pin; A switch module, the switch module comprising a PMOS tube, a gate of the PMOS tube being electrically connected to the third output pin, and a drain of the PMOS tube being electrically connected to an input end of the boost management module; A DC power supply input terminal, the DC power supply input terminal is electrically connected to the source of the PMOS tube; When the USB charging output port is connected to a power line, the second output pin is electrically connected to the third output pin to control the boost management module to operate.

2. The low power consumption USB output charging circuit according to claim 1, characterized in that: The switch module also includes a first resistor and a second resistor, one end of the first resistor is electrically connected to the source of the PMOS tube, the other end of the first resistor is electrically connected to the gate of the PMOS tube, one end of the second resistor is electrically connected to the gate of the PMOS tube, and the other end of the second resistor is electrically connected to the third output pin of the USB charging output port.

3. The low power consumption USB output charging circuit according to claim 1, characterized in that: The boost management module includes a boost DC-DC control module, a diode, an inductor, a first capacitor, a second capacitor, a current regulation module, an NMOS tube and a voltage regulation module. The boost DC-DC control module is electrically connected to one end of the inductor, one end of the first capacitor, the output end of the voltage regulation module, the drain of the NMOS tube and the gate of the NMOS tube respectively. The input end of the voltage regulation module is electrically connected to the cathode of the diode, the first output pin of the USB charging output port and one end of the second capacitor respectively. The other end of the inductor is electrically connected to the anode of the diode and the source of the NMOS tube respectively. The other end of the second capacitor is electrically connected to the current regulation module, and the other end of the first capacitor is grounded.

4. The low power consumption USB output charging circuit according to claim 3, characterized in that: The boost DC-DC control module includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin serves as an input end of the boost management module, one end of the second capacitor serves as an output end of the boost management module, the drain of the PMOS tube is electrically connected to the first pin, one end of the inductor, one end of the first capacitor and the fourth pin respectively, the second pin is grounded, the third pin is electrically connected to the output end of the voltage regulation module, the fifth pin is electrically connected to the drain of the NMOS tube, and the sixth pin is electrically connected to the gate of the NMOS tube.

5. The low power consumption USB output charging circuit according to claim 4, characterized in that: The voltage regulating module includes a third resistor and a fourth resistor, one end of the third resistor is electrically connected to the negative electrode of the diode as the input end of the voltage regulating module, the other end of the third resistor is electrically connected to one end of the fourth resistor and the third pin as the output end, and the other end of the fourth resistor is grounded.

6. The low power consumption USB output charging circuit according to claim 5, characterized in that: The voltage regulating module further includes a fifth resistor, and the fifth resistor is connected in parallel with the third resistor.

7. The low power consumption USB output charging circuit according to claim 5, characterized in that: The current regulating module includes a sixth resistor and a seventh resistor, one end of the sixth resistor is electrically connected to the other end of the fourth resistor and the other end of the second capacitor respectively, the other end of the sixth resistor is electrically connected to the second output pin of the USB charging output port, and the seventh resistor is connected in parallel with the sixth resistor.

8. The low power consumption USB output charging circuit according to claim 7, characterized in that: The sixth resistor and the seventh resistor are both zero-ohm resistors.

9. The low power consumption USB output charging circuit according to claim 3, characterized in that: The first capacitor and the second capacitor have the same capacitance.

10. The low power consumption USB output charging circuit according to claim 3, characterized in that: The boost management module further includes an eighth resistor, one end of the eighth resistor is electrically connected to the drain of the NMOS tube, and the other end of the eighth resistor is electrically connected to the gate of the NMOS tube.

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