A USB wake-up power supply circuit

Abstract

This utility model relates to the field of USB power supply technology, and provides a USB wake-up power supply circuit, including a USB female connector and a main controller, a USB boost module, and a switch module connected thereto. The switch module is electrically connected to the main controller and the USB boost module. The input terminal of the USB female connector is connected to the output terminal of the USB boost module. The detection terminal of the main controller is electrically connected to the USB female connector. The detection terminal of the main controller is electrically connected to the trigger terminal of the USB female connector. When the USB male connector is inserted into the interface slot of the USB female connector, the trigger terminal shorts the outer shell through the USB male connector, thereby triggering the detection terminal of the main controller, which in turn drives the switch module to conduct the power supply circuit. By adding wiring to the electrical circuit, access detection is achieved. Automatic detection of load access is realized without adding additional components. The circuit is simple and reliable, and requires no additional cost.

Description

Technical Field

[0001] This utility model relates to the field of USB power supply technology, and in particular to a USB wake-up power supply circuit. Background Technology

[0002] With the increasing popularity of portable battery products, users have placed strict requirements on the standby power consumption of these products, and the ideal standby current needs to be maintained in the microamp level. Therefore, products typically need to completely shut down the USB output circuit during standby, requiring a dedicated wake-up circuit to effectively detect the load connection and automatically wake up the USB output.

[0003] The current mainstream wake-up circuits are as follows: First, the button wake-up mode, although inexpensive, requires manual operation by the user, resulting in a poor user experience and failing to achieve true intelligent access detection. Secondly, setting up a dedicated IC chip to form a dedicated load detection integrated circuit can achieve automatic wake-up, but it introduces additional components, increasing circuit complexity and product cost. Summary of the Invention

[0004] This utility model provides a USB wake-up power supply circuit, which solves the technical problems of low intelligence level of button wake-up in existing battery standby wake-up solutions, and the complexity and high wake-up cost of using dedicated chip circuits.

[0005] To solve the above technical problems, this utility model provides a USB wake-up power supply circuit, including a USB female connector and a main controller, a USB boost module, and a switch module connected thereto. The switch module is electrically connected to the main controller and the USB boost module. The input terminal of the USB female connector is connected to the output terminal of the USB boost module. The detection terminal of the main controller is electrically connected to the trigger terminal of the USB female connector. When the USB male connector is inserted into the interface slot of the USB female connector, the trigger terminal shorts the outer shell through the USB male connector, thereby triggering the detection terminal of the main controller and driving the switch module to conduct the power supply circuit.

[0006] This basic solution sets up an electrical connection between the main controller's detection terminal and the USB female connector. When the USB male connector is inserted into the USB female connector's interface slot, the trigger terminal is pushed by the USB male connector to short-circuit with the outer casing, thereby triggering the main controller's detection terminal and driving the switch module to conduct the power supply circuit. By adding wiring to the electrical circuit, access detection is achieved, realizing automatic detection of load access without adding extra components. The circuit is simple and reliable, requiring no additional cost.

[0007] In a further embodiment, the trigger terminal of the USB female connector includes a fifth pin spring, which is placed in the interface slot of the USB female connector and electrically connected to the detection terminal of the main controller. When the USB male connector is not inserted, the fifth pin spring is suspended, and the detection terminal of the main controller is internally pulled up to a high potential. When the USB male connector is inserted into the interface slot of the USB female connector, the fifth pin spring is short-circuited with the outer shell of the USB female connector through the USB male connector, the potential of the detection terminal of the main controller is pulled down, thereby driving the switching module to conduct the power supply circuit.

[0008] This solution replaces the standard 4-pin TYPE A USB female connector with a 5-pin TYPE A USB female connector. The USB female connector, including the fifth pin spring, is electrically connected to the detection terminal of the main controller. When the USB male connector is inserted into the interface slot of the USB female connector, the fifth pin spring is short-circuited by the USB male connector through the conductive contact of the USB male connector to the outer shell of the USB female connector, which lowers the potential of the detection terminal of the main controller, thereby triggering the switching module to conduct the power supply circuit. Based on the pin structure of the TYPE A USB female connector itself, the function is executed to realize the automatic detection and wake-up of the load connection. The circuit is extremely simple and can effectively control costs.

[0009] In a further embodiment, the USB boost module includes a power chip U1, a first inductor L1, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1; one end of the first inductor is connected to the output terminal of the switching module, and the other end is connected to the positive terminal of the diode D1; the negative terminal of the diode D1 is connected to the USB female connector. One end of the first resistor R1 is connected to the negative terminal of the diode D1, and the other end is grounded through the second resistor R2; the power supply terminal VCC and the enable terminal EN of the power chip U1 are both connected to the output terminal of the switching module, the output terminal LX is connected to the positive terminal of the diode D1, the overcurrent protection pin OC is grounded through the third resistor R3, and the feedback pin FB is connected between the first resistor R1 and the second resistor R2; one end of the first capacitor C1 is connected to the power supply terminal VCC of the power chip U1, and the other end is grounded.

[0010] In this solution, the power chip U1, the first resistor R1, and the second resistor R2 in the USB boost module achieve precise feedback control through voltage divider feedback, ensuring a stable and accurate output voltage.

[0011] In a further embodiment, the switching module includes a first switching transistor Q1, a second switching transistor Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the control terminal of the first switching transistor Q1 is connected to the main controller through the fourth resistor R4, the first terminal is connected to the control terminal of the second switching transistor Q2 through the fifth resistor R5, and the second terminal is grounded; the first terminal of the second switching transistor Q2 is connected to the input terminal of the USB boost module, and the second terminal is connected to the power input terminal; the two ends of the USB boost module are respectively connected to the second terminal and the control terminal of the second switching transistor Q2.

[0012] In a further embodiment, the first switch Q1 includes a transistor, and the second switch Q2 includes a MOSFET.

[0013] This scheme sets up a switching module consisting of the first switching transistor Q1 and the second switching transistor Q2 of the MOSFET to control the power circuit conduction, thus realizing low-voltage switching control and high-current conduction control.

[0014] In a further embodiment, a first filtering module is also included, the first filtering module including a second capacitor C2, one end of the second capacitor C2 being connected between the switching module and the USB boost module, and the other end being grounded.

[0015] This solution connects a first filter module in series between the switching module and the boost module, which can suppress switching noise interference, stabilize the input voltage of the boost module, and improve the dynamic response and reliability of the system.

[0016] In a further implementation, a second filtering module is also included, which includes a third capacitor C3 to a sixth capacitor C6. One end of the third capacitor C3 is connected between the input terminal of the USB boost module and the USB female connector, and the other end is grounded. The fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are connected in parallel with the third capacitor C3.

[0017] This solution connects a second filter module in series between the boost module and the input terminal of the USB female connector. The second filter module consists of multiple parallel capacitors, which can effectively filter out noise in different frequency bands and improve the stability of the output power supply.

[0018] In a further embodiment, the main controller includes an MCU. Attached Figure Description

[0019] Figure 1 This is a system framework diagram of a USB wake-up power supply circuit provided in an embodiment of this utility model; Figure 2 This is provided by the embodiment of the present utility model. Figure 1 Hardware circuit diagram; Figure 3This is a front view of the USB female connector provided in this embodiment of the utility model; Figure 4 This is a rear view of the USB female connector provided in this embodiment of the utility model; The components include: USB female connector 1, fifth pin spring contact 11, and outer shell 12; main controller 2, USB boost module 3, switch module 4, first filter module 5, and second filter module 6. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the utility model. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model, because many changes can be made to this utility model without departing from the spirit and scope of this utility model.

[0021] This utility model provides a USB wake-up power supply circuit, such as... Figures 1-4 As shown, in this embodiment, it includes a USB female connector 1 and a main controller 2, a USB boost module 3, and a switch module 4 connected thereto. The switch module 4 is electrically connected to the main controller 2 and the USB boost module 3. The input terminal of the USB female connector 1 is connected to the output terminal of the USB boost module 3. The detection terminal of the main controller 2 is electrically connected to the trigger terminal of the USB female connector 1. When the USB male connector is inserted into the interface slot of the USB female connector 1, the trigger terminal is short-circuited with the outer casing 12 through the USB male connector, which triggers the detection terminal of the main controller 2, thereby driving the switch module 4 to conduct the power supply circuit.

[0022] Among them, the USB female connector 1 is a 5-pin TYPE A USB female connector 1, and the USB male connector is inserted into the USB female connector 1 with a metal shell. Therefore, after inserting the fifth pin spring 11 between the fifth pin spring 11 and the shell 12, the fifth pin spring 11 and the shell 12 will be shorted.

[0023] In this embodiment, the trigger end of the USB female connector 1 includes a fifth pin spring 11, which is placed in the interface slot of the USB female connector 1 and electrically connected to the detection end of the main controller 2. When the USB male connector is not inserted, the fifth pin spring 11 is suspended, and the detection terminal of the main controller 2 is internally pulled up to a high potential. When the USB male connector is inserted into the interface slot of the USB female connector 1, the fifth pin spring 11 is short-circuited with the outer shell 12 of the USB female connector 1 through the USB male connector, the potential of the detection terminal of the main controller 2 is pulled down, thereby driving the switch module 4 to conduct the power supply circuit.

[0024] In this embodiment, the ordinary 4-pin TYPE A USB female connector 1 is replaced with a 5-pin TYPE A USB female connector 1 (e.g., the TYPE A USB female connector with model number USB-5PZ10-072C). The USB female connector 1, including the fifth pin spring 11, is electrically connected to the detection terminal of the main controller 2. When the USB male connector is inserted into the interface slot of the USB female connector 1, the fifth pin spring 11 is short-circuited with the outer shell of the USB female connector 1 through the conductive contact of the USB male connector, which lowers the potential of the detection terminal of the main controller 2, thereby triggering the switching module 4 to conduct the power supply circuit. Based on the pin structure of the TYPE A USB female connector 1 itself, the function is executed to realize the automatic detection and wake-up of the load connection. The circuit is extremely simple and can effectively control costs.

[0025] In this embodiment, the USB boost module 3 includes a power chip U1 (e.g., a power management chip of model FP6291), a first inductor L1, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1; one end of the first inductor is connected to the output terminal of the switch module 4, and the other end is connected to the positive terminal of the diode D1; the negative terminal of the diode D1 is connected to the USB female connector 1. One end of the first resistor R1 is connected to the negative terminal of the diode D1, and the other end is grounded through the second resistor R2; the power supply terminal VCC and the enable terminal EN of the power chip U1 are both connected to the output terminal of the switch module 4, the output terminal LX is connected to the positive terminal of the diode D1, the overcurrent protection pin OC is grounded through the third resistor R3, and the feedback pin FB is connected between the first resistor R1 and the second resistor R2; one end of the first capacitor C1 is connected to the power supply terminal VCC of the power chip U1, and the other end is grounded.

[0026] In this embodiment, the power chip U1, the first resistor R1, and the second resistor R2 in the USB boost module 3 achieve precise feedback control through voltage divider feedback, ensuring stable and accurate output voltage.

[0027] In this embodiment, the switching module 4 includes a first switching transistor Q1, a second switching transistor Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The control terminal of the first switching transistor Q1 is connected to the main controller 2 through the fourth resistor R4, the first terminal is connected to the control terminal of the second switching transistor Q2 through the fifth resistor R5, and the second terminal is grounded. The first terminal of the second switching transistor Q2 is connected to the input terminal of the USB boost module 3, and the second terminal is connected to the power input terminal. The two ends of the USB boost module 3 are respectively connected to the second terminal and the control terminal of the second switching transistor Q2.

[0028] In this embodiment, the first switch Q1 includes a transistor, and the second switch Q2 includes a MOSFET.

[0029] For example, the first switching transistor Q1 is preferably an NPN transistor, and the second switching transistor Q2 is preferably a P-channel MOSFET.

[0030] In this embodiment, a switching module 4 is formed by the first switching transistor Q1 and the second switching transistor Q2 of the MOSFET to control the power circuit conduction, thereby realizing low-voltage switching control and high-current conduction control.

[0031] In this embodiment, a first filtering module 5 is also included. The first filtering module 5 includes a second capacitor C2. One end of the second capacitor C2 is connected between the switching module 4 and the USB boost module 3, and the other end is grounded.

[0032] In this embodiment, a first filter module 5 is connected in series between the switching module 4 and the boost module, which can suppress switching noise interference, stabilize the input voltage of the boost module, and improve the dynamic response and reliability of the system.

[0033] In this embodiment, a second filtering module 6 is also included. The second filtering module 6 includes a third capacitor C3 to a sixth capacitor C6. One end of the third capacitor C3 is connected between the input terminal of the USB boost module 3 and the USB female connector 1, and the other end is grounded. The fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are connected in parallel with the third capacitor C3.

[0034] In this embodiment, a second filter module 6 is connected in series between the boost module and the input terminal of the USB female connector 1. The second filter module 6 is composed of multiple parallel capacitors, which can effectively filter out noise in different frequency bands and improve the stability of the output power supply.

[0035] In this embodiment, the main controller 2 includes an MCU.

[0036] Taking the main controller 2 as an MCU as an example, the working principle of low-power wake-up in this embodiment is as follows: In standby mode, since the USB female connector 1 is not connected to the USB male connector, the fifth pin spring 11 is located on the upper surface of the plastic inside the USB female connector 1. When the USB male connector is not inserted, the fifth pin spring 11 is not connected to the outer shell 12; that is, the fifth pin spring 11 of the USB female connector 1 is not in contact with the outer shell 12 of the USB female connector 1 and is in a floating state. The MCU's detection terminal SW is pulled up to a high level by the MCU internally. At this time, the MCU's output terminal EN outputs a low level to turn off the first switching transistor Q1. At this time, the USB boost module 3 does not work, and the standby current is low.

[0037] When the USB male connector is inserted, the fifth pin spring 11 of the USB female connector 1 is shorted to the inside of the metal shell of the USB male connector, and the outside of the USB male connector is shorted to the metal shell 12 of the USB female connector. This shorts the fifth pin spring 11 of the USB female connector 1 to the metal shell 12 of the USB female connector 1 through the USB male connector shell 12, pulling the SW detection pin of the MCU to a low level. When the MCU detects the low level, it determines that a load is connected, and then the EN output pin outputs a high level to turn on the first switch Q1, which in turn turns on the second switch Q2. The USB boost circuit then connects to the battery power supply and charges the load.

[0038] When the USB male connector is unplugged, the fifth pin spring 11 of the USB female connector 1 is open-circuited with the outer shell 12, the MCU's detection terminal SW is at a high level, and the output terminal EN outputs a low level to turn off the first switch Q1, the second switch Q2 is turned off, the USB boost circuit is powered off and stops working, and the standby current decreases.

[0039] In this embodiment of the invention, the detection end of the main controller 2 is electrically connected to the USB female connector 1. When the USB male connector is inserted into the interface slot of the USB female connector 1, the trigger end (i.e., the fifth pin spring 11) is pushed by the USB male connector to short-circuit with the outer shell, thereby triggering the detection end of the main controller 2, which in turn drives the switch module 4 to conduct the power supply circuit. By adding wiring to the electrical circuit, access detection is achieved. Without adding any additional components, automatic detection of load access is realized. The circuit is simple and reliable, and no additional cost is required.

[0040] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A USB wake-up power supply circuit, characterized by: The device includes a USB female connector and a main controller, a USB boost module, and a switch module connected thereto. The switch module is electrically connected to the main controller and the USB boost module. The input terminal of the USB female connector is connected to the output terminal of the USB boost module. The detection terminal of the main controller is electrically connected to the trigger terminal of the USB female connector. When the USB male connector is inserted into the interface slot of the USB female connector, the trigger terminal shorts the outer shell through the USB male connector, thereby triggering the detection terminal of the main controller and driving the switch module to conduct the power supply circuit.

2. The USB wake-up power supply circuit of claim 1, wherein: The trigger terminal of the USB female connector includes a fifth pin spring, which is placed in the interface slot of the USB female connector and electrically connected to the detection terminal of the main controller. When the USB male connector is not inserted, the fifth pin spring is suspended, and the detection terminal of the main controller is internally pulled up to a high potential. When the USB male connector is inserted into the interface slot of the USB female connector, the fifth pin spring is short-circuited with the outer shell of the USB female connector through the USB male connector, the potential of the detection terminal of the main controller is pulled down, thereby driving the switching module to conduct the power supply circuit.

3. The USB wake-up power supply circuit as described in claim 2, characterized in that: The USB boost module includes a power chip U1, a first inductor L1, a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, and a first capacitor C1; one end of the first inductor is connected to the output terminal of the switching module, and the other end is connected to the positive terminal of the diode D1; the negative terminal of the diode D1 is connected to the USB female connector. One end of the first resistor R1 is connected to the negative terminal of the diode D1, and the other end is grounded through the second resistor R2; the power supply terminal VCC and the enable terminal EN of the power chip U1 are both connected to the output terminal of the switching module, the output terminal LX is connected to the positive terminal of the diode D1, the overcurrent protection pin OC is grounded through the third resistor R3, and the feedback pin FB is connected between the first resistor R1 and the second resistor R2; one end of the first capacitor C1 is connected to the power supply terminal VCC of the power chip U1, and the other end is grounded.

4. The USB wake-up power supply circuit as described in claim 1, characterized in that: The switching module includes a first switching transistor Q1, a second switching transistor Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The control terminal of the first switching transistor Q1 is connected to the main controller through the fourth resistor R4, and its first terminal is connected to the control terminal of the second switching transistor Q2 through the fifth resistor R5, while its second terminal is grounded. The first terminal of the second switching transistor Q2 is connected to the input terminal of the USB boost module, and its second terminal is connected to the power input terminal. The two ends of the USB boost module are respectively connected to the second terminal and the control terminal of the second switching transistor Q2.

5. A USB wake-up power supply circuit as described in claim 4, characterized in that: The first switching transistor Q1 includes a transistor, and the second switching transistor Q2 includes a MOSFET.

6. The USB wake-up power supply circuit as described in claim 1, characterized in that: It also includes a first filtering module, which includes a second capacitor C2. One end of the second capacitor C2 is connected between the switching module and the USB boost module, and the other end is grounded.

7. The USB wake-up power supply circuit as described in claim 1, characterized in that: It also includes a second filtering module, which includes a third capacitor C3 to a sixth capacitor C6. One end of the third capacitor C3 is connected between the input terminal of the USB boost module and the USB female connector, and the other end is grounded. The fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are connected in parallel with the third capacitor C3.

8. The USB wake-up power supply circuit as described in claim 1, characterized in that: The main controller includes an MCU.

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