Plug-in USB interface prevents not charging circuit

Abstract

This utility model relates to the field of USB charging technology and discloses a highly reliable and stable USB interface plug-and-unplugging prevention circuit, including a USB charging circuit (100) and a USB interface circuit (200). The USB charging circuit (100) includes a power management module (110), a first RC absorption circuit (120), a second RC absorption circuit (130), and a third RC absorption circuit (140). The first RC absorption circuit (120) is used to prevent charging abnormalities caused by charging switch spike voltage. The second RC absorption circuit (130) and the third RC absorption circuit (140) are both used to prevent spike voltage generated when repeatedly plugging and unplugging the load.

Description

Technical Field

[0001] This utility model relates to the field of USB charging technology, and more specifically, to a circuit that prevents USB interfaces from not charging when plugged in or unplugged. Background Technology

[0002] Currently, most USB chargers generate voltage spikes at the USB port when repeatedly plugging and unplugging the USB connector to charge smart electronic products, such as smartphones or tablets. These voltage spikes can impact the power management module, potentially damaging it and causing the smartphone or tablet to stop charging. This results in a poor user experience and potential losses for customers.

[0003] Therefore, how to solve the problem of smartphones or tablets failing to charge when repeatedly plugging and unplugging USB chargers has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this utility model is that, in the above-mentioned existing technology, repeated plugging and unplugging of USB interface will generate a spike voltage signal at the USB interface end. The spike voltage signal will impact the power management module and may break down the power management module, causing the smartphone or tablet to not charge. The present invention provides a highly reliable and stable circuit to prevent charging failure when plugging and unplugging USB interface.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct a circuit for preventing non-charging when plugging and unplugging a USB interface, which has the following features:

[0006] The USB charging circuit is configured within the charging circuit to receive the voltage signal input from the front-end module and to step down / filter the voltage signal to output the charging current.

[0007] The USB interface circuit has its input terminal connected to the output terminal of the USB charging circuit to receive the charging current; wherein...

[0008] The USB charging circuit includes a power management module, a first RC absorption circuit, a second RC absorption circuit, and a third RC absorption circuit.

[0009] One end of the first RC snubber circuit is connected to an output terminal of the power management module and an input terminal of the USB interface circuit to prevent charging abnormalities caused by charging switch voltage spikes.

[0010] One end of the second RC snubber circuit is connected to the first communication protocol terminal of the power management module to prevent voltage spikes generated during repeated plugging and unplugging of the load.

[0011] One end of the third RC snubber circuit is connected to the second communication protocol terminal of the power management module to prevent voltage spikes generated during repeated plugging and unplugging of the load.

[0012] The first RC snubber circuit, the second RC snubber circuit, and the third RC snubber circuit are respectively connected to the common terminal.

[0013] In some embodiments, the first RC snubber circuit includes a first resistor and a third capacitor connected in series.

[0014] One end of the first resistor is connected to an output terminal of the power management module and an input terminal of the USB interface circuit.

[0015] One end of the third capacitor is connected to the common terminal.

[0016] In some embodiments, the second RC snubber circuit includes a second resistor and a fourth capacitor connected in parallel.

[0017] One end of the second resistor and one end of the fourth capacitor are connected to the first communication protocol terminal of the power management module.

[0018] The other end of the second resistor is connected to a signal input terminal of the USB interface circuit.

[0019] The other end of the fourth capacitor is connected to the common terminal.

[0020] In some embodiments, the third RC snubber circuit includes a third resistor and a fifth capacitor connected in parallel.

[0021] One end of the third resistor and one end of the fifth capacitor are connected to the second communication protocol terminal of the power management module.

[0022] The other end of the third resistor is connected to another signal input terminal of the USB interface circuit.

[0023] The other end of the fifth capacitor is connected to the common terminal.

[0024] In some implementations, a first inductor is also included.

[0025] One end of the first inductor is connected to an output terminal of the power management module.

[0026] The other end of the first inductor is connected to the input terminal of the USB interface circuit.

[0027] In some implementations, an input filtering module is also included.

[0028] The input filtering module includes a first electrolytic capacitor and a first capacitor connected in parallel.

[0029] The first electrolytic capacitor and one end of the first capacitor are connected to the power input terminal and the power input terminal of the power management module.

[0030] The first electrolytic capacitor and its other end are connected to a common terminal.

[0031] In some implementations, an output filtering module is also included.

[0032] The output filtering module includes a second electrolytic capacitor and a sixth capacitor connected in parallel.

[0033] One end of the second electrolytic capacitor and one end of the sixth capacitor are connected to the output terminal of the power management module.

[0034] The other end of the second electrolytic capacitor and the sixth capacitor is connected to the common terminal.

[0035] The USB interface plug-and-unplug prevention circuit of this utility model includes a USB charging circuit and a USB interface circuit. The USB charging circuit includes a power management module, a first RC absorption circuit, a second RC absorption circuit, and a third RC absorption circuit. The first RC absorption circuit prevents charging abnormalities caused by charging switch spike voltage. The second and third RC absorption circuits are both used to prevent spike voltages generated when repeatedly plugging and unplugging the load. Compared with the prior art, by adding three RC absorption circuits to absorb charging switch spike voltages and spike voltages generated when repeatedly plugging and unplugging the phone or tablet, the spike voltage signals are prevented from impacting the power management module, which could potentially damage the power management module and cause the smartphone or tablet to fail to charge. This solves the problem of phones or tablets failing to charge when repeatedly plugging and unplugging the USB charger interface. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0037] Figure 1 This is a circuit diagram of an embodiment of the USB interface plug-and-play protection circuit provided by this utility model. Detailed Implementation

[0038] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0039] like Figure 1 As shown, in the first embodiment of the USB interface plug-and-unplug prevention circuit of this utility model, the USB interface plug-and-unplug prevention circuit 10 includes a USB charging circuit 100 and a USB interface circuit 200.

[0040] The USB charging circuit 100 has the functions of input filtering, voltage regulation and output filtering. It is used to receive the voltage signal input from the previous stage, and then perform filtering and voltage regulation to input charging current to the USB interface circuit 200.

[0041] The USB interface circuit 200 is used to receive charging current and provide charging current to smartphones or tablets. The USB interface circuit 200 uses a USB-TYPE-C interface, specifically a 16-pin TYPE-C interface, which can be plugged in either direction.

[0042] Its maximum charging current is 3A. USB1-A5 and USB1-A6 are connected to 5V voltage through the fourth resistor R104 and the fifth resistor R105 respectively, so that the potential of USB1-A5 and USB1-A6 is high level; this can prevent communication abnormalities and charging failure caused by unstable level of USB1-A5 and USB1-A6.

[0043] The USB charging circuit 100 includes a power management module 110, a first RC absorption circuit 110, a second RC absorption circuit 120, and a third RC absorption circuit 130.

[0044] The power management module 110 has the functions of synchronous switching charging and discharging, built-in power path management, and adaptive charging current regulation. The power management module 110 includes at least a power management module U101.

[0045] The first RC absorption circuit 110 is used to prevent charging abnormalities caused by charging switch spike voltage;

[0046] The second RC absorption circuit 120 and the third RC absorption circuit 130 are used to prevent the peak voltage generated when repeatedly plugging and unplugging the mobile phone or tablet from being output to the power management module 110, which would cause the power management module 110 to be broken down or damaged, and cause the USB charging circuit 100 to fail to charge.

[0047] Specifically, the USB charging circuit 100 is configured within the charging circuit, which is used to receive the voltage signal input from the front-end module, perform step-down / filtering processing on the voltage signal, and input charging current to the USB interface circuit 200.

[0048] The input terminal of the USB interface circuit 200 is connected to the output terminal of the USB charging circuit 100 to receive charging current for charging smartphones or tablets connected to the USB interface circuit 200; wherein,

[0049] The USB charging circuit 100 includes a power management module 110, a first RC absorption circuit 110, a second RC absorption circuit 120, and a third RC absorption circuit 130.

[0050] Specifically, one end of the first RC absorption circuit 110 is connected to an output terminal of the power management module 110 and an input terminal of the USB interface circuit 200, in order to prevent charging abnormalities in the USB interface circuit 200 caused by charging switch spike voltage.

[0051] One end of the second RC snubber circuit 120 is connected to the first communication protocol terminal of the power management module 110 to prevent voltage spikes generated when repeatedly plugging and unplugging the load (mobile phone or tablet).

[0052] One end of the third RC absorption circuit 130 is connected to the second communication protocol terminal of the power management module 110 to prevent voltage spikes generated when repeatedly plugging and unplugging the load (mobile phone or tablet).

[0053] The first RC absorption circuit 110, the second RC absorption circuit 120, and the third RC absorption circuit 130 are respectively connected to the common terminal.

[0054] This technical solution uses three RC absorption circuits to absorb the voltage spikes generated by the charging switch and repeated plugging and unplugging of the phone or tablet. This prevents the voltage spikes from impacting the power management module and potentially damaging it, which could cause the smartphone or tablet to fail to charge. This solution addresses the issue of phones or tablets failing to charge when repeatedly plugging and unplugging the USB charger.

[0055] In some implementations, to improve the reliability of peak voltage absorption, a first resistor R101 and a third capacitor C103 can be provided in the first RC absorption circuit 110.

[0056] The first resistor R101 and the third capacitor C103 are connected in series.

[0057] One end of the first resistor R101 is connected to an output terminal (pin 5) of the power management module U101 (belonging to power management module 110) and an input terminal (pin A4) of the USB interface circuit 200.

[0058] One end of the third capacitor C103 is connected to the common terminal.

[0059] That is, the charging signal output by the power management module U101 (belonging to the power management module 110) absorbs its peak part through the first resistor R101 and the third capacitor C103, and then inputs it into the USB interface circuit 200 to output charging current to the load.

[0060] In some implementations, to ensure the safe operation of the power management module U101, a second resistor R102 and a fourth capacitor C104 can be provided in the second RC snubber circuit 120.

[0061] Among them, the second resistor R102 and the fourth capacitor C104 are connected in parallel;

[0062] One end of the second resistor R102 and the fourth capacitor C104 are connected to the first communication protocol terminal (corresponding to pin 3) of the power management module U101 (belonging to the power management module 110).

[0063] The other end of the second resistor R102 is connected to a signal input terminal (corresponding to pin A6) of the USB interface circuit 200.

[0064] The other end of the fourth capacitor C104 is connected to the common terminal.

[0065] In some implementations, to ensure the safe operation of the power management module U101, a third resistor R103 and a fifth capacitor C105 can be provided in the third RC snubber circuit 130.

[0066] The third resistor R103 and the fifth capacitor C105 are connected in parallel.

[0067] One end of the third resistor R103 and the fifth capacitor C105 are connected to the second communication protocol terminal (corresponding to pin 4) of the power management module U101 (belonging to power management module 110).

[0068] The other end of the third resistor R103 is connected to another signal input terminal (corresponding to pin A7) of the USB interface circuit 200.

[0069] The other end of the fifth capacitor C105 is connected to the common terminal.

[0070] In some implementations, to improve the smoothness of the output charging signal, a first inductor L101 can be included in the charging circuit, which has a filtering function.

[0071] Specifically, one end of the first inductor L101 is connected to an output terminal (corresponding to pin 7) of the power management module U101 (belonging to the power management module 110).

[0072] The other end of the first inductor L101 is connected to the input terminal (corresponding to pin A4) of the USB interface circuit 200. That is, the output charging current signal is filtered by the first inductor L101 and then input to the input terminal (corresponding to pin A4) of the USB interface circuit 200.

[0073] In some implementations, to improve the smoothness of the input voltage signal, an input filtering module can be provided in the charging circuit. This input filtering module includes a first electrolytic capacitor EC11 and a first capacitor C101 connected in parallel.

[0074] One end of the first electrolytic capacitor EC11 and the first capacitor C101 are connected to the power input terminal (corresponding to the VIN terminal) and the power input terminal (corresponding to pin 1) of the power management module U101 (belonging to the power management module 110).

[0075] The other ends of the first electrolytic capacitor EC11 and the first capacitor C101 are connected to the common terminal. The voltage signal input by the power supply (corresponding to the VIN terminal) is filtered by the first electrolytic capacitor EC11 and the first capacitor C101 before being input to the power management module U101.

[0076] In some implementations, to improve the smoothness of the output charging signal, an output filtering module can be provided in the charging circuit. This output filtering module includes a second electrolytic capacitor EC12 and a sixth capacitor C106 connected in parallel.

[0077] Among them, one end of the second electrolytic capacitor EC12 and the sixth capacitor C106 are connected to one output terminal (corresponding to pin 7) of the power management module U101 (belonging to the power management module 110).

[0078] The other ends of the second electrolytic capacitor EC12 and the sixth capacitor C106 are connected to the common terminal. That is, the output charging current signal is filtered by the second electrolytic capacitor EC12 and the sixth capacitor C106 before being input to the input terminal (corresponding to pin A4) of the USB interface circuit 200.

[0079] Specifically, the USB charging circuit 100 is a BUCK topology DC-DC control section, and the power management module U101 is a chip IC of the BUCK circuit. The voltage is input through pin 1 of the power management module U101, controlled by the internal BUCK high-frequency PWM switch, and the high-frequency PWM switching signal is output from pin 7 of the power management module U101. The internal switching transistor and the first inductor L101 form a step-down circuit, and the output current is sufficient to charge the smartphone / tablet after being filtered by the second electrolytic capacitor EC12 and the sixth capacitor C106.

[0080] Among them, the network "VO" terminal feeds voltage feedback to pin 5 of the power management module U101, and outputs a stable 5V voltage after internal calculation by the power management module U101. The second capacitor C35 is a bootstrap capacitor used for internal power supply.

[0081] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A circuit for preventing non-charging of a plug-in USB interface, characterized in that have: The USB charging circuit is configured within the charging circuit to receive the voltage signal input from the front-end module and to step down / filter the voltage signal to output the charging current. The USB interface circuit has its input terminal connected to the output terminal of the USB charging circuit to receive the charging current; wherein... The USB charging circuit includes a power management module, a first RC absorption circuit, a second RC absorption circuit, and a third RC absorption circuit. One end of the first RC snubber circuit is connected to an output terminal of the power management module and an input terminal of the USB interface circuit to prevent charging abnormalities caused by charging switch voltage spikes. One end of the second RC snubber circuit is connected to the first communication protocol terminal of the power management module to prevent voltage spikes generated during repeated plugging and unplugging of the load. One end of the third RC snubber circuit is connected to the second communication protocol terminal of the power management module to prevent voltage spikes generated during repeated plugging and unplugging of the load. The first RC snubber circuit, the second RC snubber circuit, and the third RC snubber circuit are respectively connected to the common terminal.

2. The USB interface plug-and-unplug prevention circuit according to claim 1, characterized in that, The first RC snubber circuit includes a first resistor and a third capacitor connected in series. One end of the first resistor is connected to an output terminal of the power management module and an input terminal of the USB interface circuit. One end of the third capacitor is connected to the common terminal.

3. The USB interface plug-and-unplug prevention circuit according to claim 2, characterized in that, The second RC snubber circuit includes a second resistor and a fourth capacitor connected in parallel. One end of the second resistor and one end of the fourth capacitor are connected to the first communication protocol terminal of the power management module. The other end of the second resistor is connected to a signal input terminal of the USB interface circuit. The other end of the fourth capacitor is connected to the common terminal.

4. The USB interface plug-and-unplug prevention circuit according to claim 3, characterized in that, The third RC absorption circuit includes a third resistor and a fifth capacitor connected in parallel. One end of the third resistor and one end of the fifth capacitor are connected to the second communication protocol terminal of the power management module. The other end of the third resistor is connected to another signal input terminal of the USB interface circuit. The other end of the fifth capacitor is connected to the common terminal.

5. The plug USB interface preventing non-charging circuit according to any one of claims 1-4, characterized in that, It also includes the first inductor, One end of the first inductor is connected to an output terminal of the power management module. The other end of the first inductor is connected to the input terminal of the USB interface circuit.

6. The plug USB interface preventing non-charging circuit according to any one of claims 1-4, characterized in that, It also includes an input filtering module. The input filtering module includes a first electrolytic capacitor and a first capacitor connected in parallel. The first electrolytic capacitor and one end of the first capacitor are connected to the power input terminal and the power input terminal of the power management module. The first electrolytic capacitor and its other end are connected to a common terminal.

7. The plug USB interface preventing non-charging circuit according to any one of claims 1-4, characterized in that, It also includes an output filtering module. The output filtering module includes a second electrolytic capacitor and a sixth capacitor connected in parallel. One end of the second electrolytic capacitor and one end of the sixth capacitor are connected to the output terminal of the power management module. The other end of the second electrolytic capacitor and the sixth capacitor is connected with a common end.

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