Low-power-consumption USB output charging circuit

Abstract

The utility model provides a low-power-consumption USB output charging circuit, which belongs to the field of electricity and comprises a switch module, an MCU, an output control module, a direct-current power supply input end, a USB charging output port and a boost management module. The switch module comprises a triode, and an emitter of the triode is grounded; the output end of the MCU is electrically connected with the base electrode of the triode; the output control module comprises a first PMOS (P-channel Metal Oxide Semiconductor) tube and a second PMOS tube; a grid electrode of the first PMOS tube and a grid electrode of the second PMOS tube are electrically connected with a collector electrode of the triode; the input end of the direct-current power supply is electrically connected with the MCU, the source electrode of the first PMOS tube and the source electrode of the second PMOS tube respectively; the boost management module is electrically connected with the output control module and the USB charging output port. Wherein when the switch module is in the working state, the switch module controls the output control module to work, and when the switch module stops working, the switch module controls the output control module to stop working, so that a relatively long standby time can be obtained, and the use experience of a user is further improved.

Description

Technical Field

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

[0002] At present, there are more and more products with lithium batteries on the market, such as various lamps or fans or power bank products equipped with USB output charging function. However, these products equipped with lithium batteries have high power consumption in the USB output circuit during standby, so that when users need to use products with lithium batteries, the lithium batteries have already been exhausted and cannot be used normally, and even make the products with lithium batteries unable to charge normally, which greatly affects the user experience. Therefore, it is urgent to design a USB output charging circuit with low power consumption to obtain a longer standby time, thereby improving the user experience. Utility Model Content

[0003] 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 that can obtain a longer standby time, thereby improving the user experience.

[0004] To achieve the above purpose, the embodiment of the present application proposes a low-power USB output charging circuit, including: a switch module, an MCU, an output control module, a DC power input terminal, a USB charging output port, and a boost management module;

[0005] The switch module includes a triode, and the emitter of the triode is grounded;

[0006] The output end of the MCU is electrically connected to the base of the transistor;

[0007] The output control module comprises a first PMOS tube and a second PMOS tube, and the gate of the first PMOS tube and the gate of the second PMOS tube are both electrically connected to the collector of the triode;

[0008] The DC power input terminal is electrically connected to the MCU, the source of the first PMOS tube, and the source of the second PMOS tube respectively;

[0009] The USB charging output port is used for output charging;

[0010] The boost management module is electrically connected to the output control module and the USB charging output port respectively;

[0011] Wherein, when the switch module is in a working state, the switch module controls the output control module to work, and when the switch module stops working, the switch module controls the output control module to stop working.

[0012] A low-power USB output charging circuit provided by an embodiment of the utility model has at least the following beneficial effects: when the output end of the MCU outputs a high level, the triode in the switch module is turned on, the gate of the first PMOS tube and the gate of the second PMOS tube in the output control module are electrically connected to the ground end through the triode, the level of the gate of the first PMOS tube and the gate of the second PMOS tube is pulled down, the first PMOS tube and the second PMOS tube are both turned on, and the current is output from the DC power input end, flows through the first PMOS tube and the second PMOS tube to provide power to the boost management module, so that the boost management module provides the target voltage and current to the USB charging output port for output charging, and the boost management module is controlled to work and stop working by controlling the on and off of the first PMOS tube and the second PMOS tube in the output control module. The design of the output control module avoids the DC power input end directly supplying power to the boost management module, and realizes that when the lithium battery is charged, the output control module is controlled to disconnect the power supplied to the boost management module, so that the boost management module stops working, which can effectively reduce power consumption, obtain a longer standby time, and thus improve the user experience.

[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 output end of the MCU, the other end of the first resistor is respectively electrically connected to the base of the transistor and one end of the second resistor, and the other end of the second resistor is grounded.

[0014] In some embodiments, the output control module further includes a third resistor, one end of the third resistor is electrically connected to the DC power supply input terminal, and the other end of the third resistor is electrically connected to the collector of the transistor.

[0015] In some embodiments, the boost management module includes a first capacitor, a second capacitor, an inductor and a charging IC module, one end of the first capacitor is electrically connected to the drain of the first PMOS tube, the drain of the second PMOS tube, one end of the inductor and one end of the second capacitor, respectively, the charging IC module is electrically connected to the other end of the inductor and one end of the second capacitor, respectively, and the other end of the second capacitor and the other end of the first capacitor are both grounded.

[0016] In some embodiments, the boost management module further includes a fourth resistor and a third capacitor, and the fourth resistor and the third capacitor are both connected in parallel with the first capacitor.

[0017] In some embodiments, the boost management module also includes a fourth capacitor, a fifth capacitor and a sixth capacitor, one end of the fourth capacitor is electrically connected to the charging IC module and the USB charging output port, respectively, the other end of the fourth capacitor is grounded, and the fifth capacitor and the sixth capacitor are both connected in parallel with the fourth capacitor.

[0018] In some embodiments, the charging IC module includes a first pin, a second pin and a third pin, the first pin is electrically connected to one end of the second capacitor, the second pin is electrically connected to the other end of the inductor, and the third pin is electrically connected to one end of the fourth capacitor.

[0019] In some embodiments, the USB charging output port includes a first output terminal, a second output terminal, a third output terminal and a fourth output terminal, the first output terminal is grounded, the second output terminal is electrically connected to the third output terminal, and the fourth output terminal is electrically connected to the third pin of the charging IC module.

[0020] In some embodiments, the capacitances of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor are all equal.

[0021] In some embodiments, a startup module is further included, and the startup module is electrically connected to the MCU. When the startup module is working, the startup module controls the operation of the MCU. 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 1 This is a system architecture diagram of a low-power USB output charging circuit provided by an embodiment of the utility model;

[0025] Figure 2 It is an overall schematic diagram of a low-power USB output charging circuit 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, there are more and more products with lithium batteries on the market, such as various lamps or fans or power bank products equipped with USB output charging function. However, these products equipped with lithium batteries have high power consumption in the USB output circuit during standby, so that when users need to use products with lithium batteries, the lithium batteries have already been exhausted and cannot be used normally, and even make the products with lithium batteries unable to charge normally, which greatly affects the user experience. Therefore, it is urgent to design a USB output charging circuit with low power consumption to obtain a longer standby time, thereby improving the user experience.

[0030] The embodiment of the utility model provides a low-power USB output charging circuit, which can obtain a longer standby time, thereby improving the user experience.

[0031] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0032] Reference Figure 1 , Figure 2 The utility model provides a low-power USB output charging circuit, including: a switch module 100, an MCU, an output control module 200, a DC power input terminal B+, a USB charging output port 400 and a boost management module 300;

[0033] The switch module 100 includes a transistor Q1, and the emitter of the transistor Q1 is grounded;

[0034] The output terminal PWR_ON of the MCU is electrically connected to the base of the transistor Q1;

[0035] The output control module 200 includes a first PMOS transistor Q2 and a second PMOS transistor Q3, and the gate of the first PMOS transistor Q2 and the gate of the second PMOS transistor Q3 are both electrically connected to the collector of the transistor Q1;

[0036] The DC power input terminal B+ is electrically connected to the MCU, the source of the first PMOS tube Q2, and the source of the second PMOS tube Q3 respectively;

[0037] The USB charging output port 400 is used for output charging;

[0038] The boost management module 300 is electrically connected to the output control module 200 and the USB charging output port 400 respectively;

[0039] When the switch module 100 is in working state, the switch module 100 controls the output control module 200 to work; when the switch module 100 stops working, the switch module 100 controls the output control module 200 to stop working.

[0040] According to a low-power USB output charging circuit provided by an embodiment of the utility model, when the output terminal PWR_ON of the MCU outputs a high level, the transistor Q1 in the switch module 100 is turned on, the gate of the first PMOS tube Q2 and the gate of the second PMOS tube Q3 in the output control module 200 are electrically connected to the ground terminal through the transistor Q1, the gate level of the first PMOS tube Q2 and the gate level of the second PMOS tube Q3 are pulled down, the first PMOS tube Q2 and the second PMOS tube Q3 are turned on, and the current is output from the DC power input terminal B+, flows through the first PMOS tube Q2 and the second PMOS tube Q3 to provide the boost management module 300 with a current. The power supply enables the boost management module 300 to provide the target voltage and current to the USB charging output port 400 for charging output. The boost management module 300 is controlled to work and stop working by controlling the on and off of the first PMOS tube Q2 and the second PMOS tube Q3 in the output control module 200. The design of the output control module 200 avoids the direct current power input terminal B+ directly supplying power to the boost management module 300, and realizes that when the lithium battery is powered, the output control module 200 is controlled to disconnect the power supplied to the boost management module 300, so that the boost management module 300 stops working, which can effectively reduce power consumption, obtain a longer standby time, and thus improve the user experience.

[0041] It should be noted that before the switch module 100 is turned on, the gate of the first PMOS tube Q2 and the gate of the second PMOS tube Q3 in the output control module 200 are electrically connected to the DC power supply input terminal B+, and the levels of the gate of the first PMOS tube Q2 and the gate of the second PMOS tube Q3 are both high.

[0042] It should be noted that the DC power input terminal B+ is electrically connected to the lithium battery.

[0043] In some embodiments, a startup module is also included. The startup module is electrically connected to the MCU. When the startup module is working, the startup module controls the MCU to work.

[0044] Preferably, the starting module may be a touch switch.

[0045] It should be noted that the MCU is electrically connected to the DC power input terminal B+, and a resistor is provided inside the MCU to detect the voltage of the lithium battery.

[0046] It should be noted that when the startup module is turned on, that is, the touch switch is pressed, the MCU is in standby mode. At the same time, the output terminal PWR_ON of the MCU outputs a high level, so that the switch module 100 works, and then the output control module 200 provides power to the boost management module 300.

[0047] Furthermore, if the MCU detects that the power voltage at the DC power input terminal B+ reaches a preset voltage, the MCU stops all outputs and enters a sleep state to protect the lithium battery from over-discharge. The transistor Q1 in the switch module 100 is cut off, and the first PMOS tube Q2 and the second PMOS tube Q3 in the output control module 200 are both cut off, and power is stopped from being provided to the boost management module 300. The boost management module 300 stops working, and the USB charging output port 400 has no output.

[0048] Preferably, the preset voltage may be 3V.

[0049] It should be noted that when the startup module is turned off, the MCU is in a dormant state, so that the switch module 100 stops working, and the output control module 200 further disconnects the power supply to the boost management module 300 .

[0050] It is understandable that when the MCU is in a dormant state, the startup module needs to be triggered to activate the MCU so that the MCU enters a standby state.

[0051] Reference Figure 2 In some embodiments, the switch module 100 also includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is electrically connected to the output end PWR_ON of the MCU, the other end of the first resistor R1 is electrically connected to the base of the transistor Q1 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded.

[0052] Preferably, the resistance value of the first resistor R1 is 1k, and the resistance value of the second resistor R2 is 10k.

[0053] Reference Figure 2 In some embodiments, the output control module 200 further includes a third resistor R3, one end of the third resistor R3 is electrically connected to the DC power input terminal B+, and the other end of the third resistor R3 is electrically connected to the collector of the transistor Q1.

[0054] Preferably, the resistance of the third resistor R3 is 10k.

[0055] Reference Figure 2In some embodiments, the boost management module 300 includes a first capacitor C1, a second capacitor C2, an inductor L1 and a charging IC module U1. One end of the first capacitor C1 is electrically connected to the drain of the first PMOS tube Q2, the drain of the second PMOS tube Q3, one end of the inductor L1 and one end of the second capacitor C2, respectively. The charging IC module U1 is electrically connected to the other end of the inductor L1 and one end of the second capacitor C2, respectively. The other end of the second capacitor C2 and the other end of the first capacitor C1 are both grounded.

[0056] Preferably, the capacitance of the first capacitor C1 is 10uf, the capacitance of the second capacitor C2 is 10uF, and the inductance of the first inductor L1 is 2.2uH.

[0057] Reference Figure 2 In some embodiments, the boost management module 300 further includes a fourth resistor R4 and a third capacitor C3, and both the fourth resistor R4 and the third capacitor C3 are connected in parallel with the first capacitor C1.

[0058] Preferably, the resistance of the fourth resistor R4 is 1k, and the capacitance of the third capacitor C3 is 10uF.

[0059] It should be noted that by connecting a suitable first capacitor C1, a second capacitor C2, a fourth resistor R4, a third capacitor C3 and an inductor L1 to the charging IC module U1, a charging voltage and current of 5V / 2A can be stably output to the USB charging output port 400.

[0060] Reference Figure 2 In some embodiments, the boost management module 300 also includes a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6, one end of the fourth capacitor C4 is electrically connected to the charging IC module U1 and the USB charging output port 400 respectively, the other end of the fourth capacitor C4 is grounded, and the fifth capacitor C5 and the sixth capacitor C6 are both connected in parallel with the fourth capacitor C4.

[0061] Preferably, the capacitance of the fourth capacitor C4 is 10 uf, the capacitance of the fifth capacitor C5 is 10 uF, and the capacitance of the sixth capacitor C6 is 10 uF.

[0062] Reference Figure 2 In some embodiments, the charging IC module U1 includes a first pin 4, a second pin 3 and a third pin 2, the first pin 4 is electrically connected to one end of the second capacitor C2, the second pin 3 is electrically connected to the other end of the inductor L1, and the third pin 2 is electrically connected to one end of the fourth capacitor C4.

[0063] Reference Figure 2In some embodiments, the USB charging output port 400 includes a first output terminal, a second output terminal, a third output terminal and a fourth output terminal, the first output terminal is grounded, the second output terminal is electrically connected to the third output terminal, and the fourth output terminal is electrically connected to the third pin 2 of the charging IC module U1.

[0064] Reference Figure 2 In some embodiments, the capacitances of the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 are all equal.

[0065] 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 consumption USB output charging circuit, characterized in that: include: A switch module, the switch module comprising a transistor, the emitter of the transistor being grounded; MCU, the output end of the MCU is electrically connected to the base of the transistor; An output control module, the output control module comprising a first PMOS tube and a second PMOS tube, wherein the gate of the first PMOS tube and the gate of the second PMOS tube are both electrically connected to the collector of the triode; A DC power input terminal, the DC power input terminal being electrically connected to the MCU, the source of the first PMOS tube, and the source of the second PMOS tube respectively; USB charging output port, the USB charging output port is used for output charging; A boost management module, the boost management module is electrically connected to the output control module and the USB charging output port respectively; Wherein, when the switch module is in a working state, the switch module controls the output control module to work, and when the switch module stops working, the switch module controls the output control module to stop working.

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 output end of the MCU, the other end of the first resistor is electrically connected to the base of the transistor and one end of the second resistor respectively, and the other end of the second resistor is grounded.

3. The low power consumption USB output charging circuit according to claim 1, characterized in that: The output control module further includes a third resistor, one end of the third resistor is electrically connected to the DC power supply input terminal, and the other end of the third resistor is electrically connected to the collector of the transistor.

4. The low power consumption USB output charging circuit according to claim 1, characterized in that: The boost management module includes a first capacitor, a second capacitor, an inductor and a charging IC module, one end of the first capacitor is electrically connected to the drain of the first PMOS tube, the drain of the second PMOS tube, one end of the inductor and one end of the second capacitor, respectively, the charging IC module is electrically connected to the other end of the inductor and one end of the second capacitor, respectively, and the other end of the second capacitor and the other end of the first capacitor are both grounded.

5. The low power consumption USB output charging circuit according to claim 4, characterized in that: The boost management module further includes a fourth resistor and a third capacitor, and the fourth resistor and the third capacitor are both connected in parallel with the first capacitor.

6. The low power consumption USB output charging circuit according to claim 5, characterized in that: The boost management module also includes a fourth capacitor, a fifth capacitor and a sixth capacitor, one end of the fourth capacitor is electrically connected to the charging IC module and the USB charging output port respectively, the other end of the fourth capacitor is grounded, and the fifth capacitor and the sixth capacitor are both connected in parallel with the fourth capacitor.

7. The low power consumption USB output charging circuit according to claim 6, characterized in that: The charging IC module includes a first pin, a second pin and a third pin, the first pin is electrically connected to one end of the second capacitor, the second pin is electrically connected to the other end of the inductor, and the third pin is electrically connected to one end of the fourth capacitor.

8. The low power consumption USB output charging circuit according to claim 7, characterized in that: The USB charging output port includes a first output terminal, a second output terminal, a third output terminal and a fourth output terminal, the first output terminal is grounded, the second output terminal is electrically connected to the third output terminal, and the fourth output terminal is electrically connected to the third pin of the charging IC module.

9. The low power consumption USB output charging circuit according to claim 6, characterized in that: The capacitances of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor and the sixth capacitor are all equal.

10. The low-power USB output charging circuit according to any one of claims 1 to 9, characterized in that: It also includes a startup module, which is electrically connected to the MCU. When the startup module is working, the startup module controls the MCU to work.

Images