Power supply circuit of back splint type product

Abstract

The invention relates to the technical field of electronic communication equipment, in particular to a back splint type product power supply circuit, a Type-C plug of a back splint is provided with a first control signal path and a second control signal path, and the second control signal path of the Type-C plug is periodically pulled up by a connected mobile phone. One path of a first control signal of the Type-C plug is connected with a Type-C controller in the back clamp, one path of a first control signal of the Type-C plug is connected with a third resistor in series, the third resistor is connected with a normally-closed switch in series, the normally-closed switch is connected with a drain electrode of an NOMS tube in series, and a source electrode of the NOMS tube is grounded. Controllable power supply is achieved, the normal use function of the back splint is guaranteed, and meanwhile the power consumption of the mobile phone is reduced to the minimum.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic communication equipment, and in particular to a power supply circuit for a back-clip product. Background Art

[0002] ‌‌A mobile phone holder is an add-on device designed to provide additional functionality or enhance the performance of a mobile phone. There are many types of mobile phone holders, including but not limited to communication holders, etc., each type has its specific purpose and function.

[0003] Existing mobile phone back clip products use a USB Type-C controller that supports two USB Type-C interfaces, where the two Type-C interfaces of the controller are respectively connected to the Type-C plug and the Type-C socket, which are used to connect the mobile phone that comes with the back clip and the Type-C interface device connected to the back clip.

[0004] When used in normal conditions, the matching mobile phone is embedded in the back clip, and the Type-C plug of the back clip is inserted into the Type-C socket of the mobile phone. According to the common working scenarios of the mobile phone, there are the following situations: Working scenario 1: The back clip is used alone, and the matching mobile phone powers the back clip through the Type-C plug of the back clip.

[0005] Working scenario 2: The external charger is connected to the Type-C socket of the back clip to power the back clip and the mobile phone at the same time.

[0006] Working scenario 3: An external USB device (such as a digital headset or USB flash drive) is connected to the Type-C socket of the back clip, and the phone powers both the back clip and the external USB device.

[0007] Based on the above-mentioned common back clip usage, in order to ensure that the system can recognize when an external USB device is inserted, the back clip circuit needs to maintain power supply and continue to consume power. At the same time, the mobile phone keeps powering the back clip, which will also increase the power consumption of the mobile phone itself. The combination of these two factors causes the standby time of the mobile phone to be shortened a lot after it is paired with a back clip. Secondly, some back clip solutions only use software to turn on the power supply of the mobile phone to the back clip when the back clip is in use, and this method cannot automatically recognize the insertion of external USB devices.

[0008] Based on the above reasons, the present invention designs a power circuit for back clip products. By using the idle CC signal in the Type-C plug, the back clip does not trigger the mobile phone to power up in normal standby mode, thereby ensuring the standby time of the mobile phone. At the same time, in the back clip working scenario, a power request is generated through the mechanical switch in the circuit and the built-in trigger circuit, triggering the mobile phone to power the back clip. In this way, the back clip function can be ensured while extending the standby time of the system and improving practicality. Summary of the invention

[0009] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a power supply circuit for a back clip product. By using the idle CC signal in the Type-C plug, the back clip does not trigger the mobile phone to power up in normal standby mode, thereby ensuring the standby time of the mobile phone. At the same time, in the back clip working scenario, a power supply request is generated through the mechanical switch in the circuit and the built-in trigger circuit, triggering the mobile phone to power the back clip, so that the back clip function can be ensured while extending the standby time of the system and improving practicality.

[0010] In order to achieve the above-mentioned purpose, the present invention provides a power supply circuit for a back clip product, wherein the Type-C plug of the back clip is provided with a control signal one signal path and a control signal two signal path, and the control signal two signal path of the Type-C plug is periodically pulled high by the connected mobile phone to detect the insertion of an adapter or an external USB device. The control signal one path of the Type-C plug is connected to the Type-C controller in the back clip, and the control signal one path of the Type-C plug is connected in series with a resistor three, and the resistor three is connected in series with a normally closed switch, and the normally closed switch is connected in series with the drain of a NOMS tube, and the source of the NOMS tube is grounded; The power supply of the Type-C plug is connected to the back clip system power supply after a series voltage regulator, and the back clip system power supply is connected to the back clip system power supply through a diode and a series resistor. The control signal 2 of the Type-C plug passes through the diode and the series resistor 1; The back clip system power supply, CC2 signal, and Type-C socket output external USB device insertion signal are connected in parallel, grounded through capacitors, and connected to the gate of the NOMS tube; One GND pin of the Type-C socket is not grounded and outputs an external USB device insertion signal; The external USB device insertion signal is connected to the gate of the NOMS tube; The Type-C socket connects to other external devices via USB; The resistance value of resistor 3 is 800 to 1200 ohms; Normally closed switches are mechanical switches; The NOMS tube gate is controlled by control signal 2, back clip system power supply, and external USB device insertion signal at the same time.

[0011] The control signal 2 is filtered by RC before being connected to the gate of the NOMS tube.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses the power circuit in the back clip to simulate different working scenarios such as the connection between the mobile phone and the back clip, and the connection between the external USB and the back clip, so as to realize power supply for the mobile phone and the back clip, or reversely power supply for the back clip and the external USB device through the mobile phone. At the same time, the idle control signal makes the back clip not need power supply from the mobile phone in normal standby mode, thus ensuring the power conservation of the mobile phone, and requests the mobile phone to power the back clip through the mechanical switch and the built-in trigger circuit, thus realizing power supply without software awakening the mobile phone, and intelligently determining the power supply timing, effectively reducing the power loss of the mobile phone. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the circuit structure of the present invention.

[0014] Description of reference numerals: R1 is resistor one, R2 is resistor two, R3 is resistor three, Q1 is a NOMS tube, Switch1 is a normally closed switch, C1 is a capacitor, CC1 is control signal one, and CC2 is control signal two. DETAILED DESCRIPTION

[0015] The present invention will now be further described with reference to the accompanying drawings. See also Figure 1 , the present invention provides a power supply circuit for a back clip product: The Type-C plug of the back clip is provided with a control signal CC1 signal and a control signal CC2 signal. The control signal CC2 signal of the Type-C plug is periodically pulled high by the connected mobile phone to detect the insertion of the adapter or external USB device. The control signal CC1 of the Type-C plug is connected to the Type-C controller in the back clip. The control signal CC1 of the Type-C plug is connected in series with the resistor R3, the resistor R3 is connected in series with the normally closed switch Switch1, the normally closed switch Switch1 is connected in series with the drain of the NOMS tube Q1, and the source of the NOMS tube Q1 is grounded; The power supply of the Type-C plug is connected to the back clip system power supply after being connected to the voltage regulator LDO in series. The back clip system power supply is connected to the resistor R2 in series after passing through the diode. The control signal CC2 of the Type-C plug passes through the diode and then the resistor R1 in series; The back clip system power supply, CC2 signal, and Type-C socket output external USB device insertion signal are connected in parallel and then grounded through capacitor C1 and connected to the gate of NOMS tube Q1; One GND pin of the Type-C socket is not grounded and outputs an external USB device insertion signal; The external USB device insertion signal is connected to the gate of the NOMS tube Q1.

[0016] The Type-C socket connects to other external devices via USB.

[0017] The resistance value of resistor three R3 is 800 to 1200 ohms.

[0018] The normally closed switch Switch1 is a mechanical switch.

[0019] The gate of NOMS tube Q1 is controlled by control signal CC2, back clip system power supply, and external USB device insertion signal at the same time.

[0020] The control signal CC2 is filtered by RC before being connected to the gate of NOMS tube Q1.

[0021] In the Type-C interface signal between the back clip and the mobile phone, only the control signal CC1 is used as the communication signal between the back clip and the mobile phone. The control signal CC1 signal has two branches, one connected to the control signal CC1 pin of the back clip Type-C controller, and the other connected in series with a 1.2K resistor and then pulled down to the ground through a switch.

[0022] The back clip has a built-in normally closed switch Switch1 and an NMOS tube Q1, both of which are connected in series to the pull-down line of the control signal CC1. The control signal CC2 of the Type-C interface is provided by the mobile phone and periodically pulled up. After RC filtering, it is output to the gate of the NMOS tube Q1. At the same time, the back clip power output by the mobile phone to the back clip also synchronously controls the gate of the NMOS tube Q1.

[0023] In the back clip standby state, the control signal CC2 is periodically pulled high to turn on the NMOS tube Q1. At this time, the normally closed mechanical switch SWITCH1 is also in the closed state. Therefore, the pull-down circuit of the control signal CC1 is turned on, and the pull-down resistor of the control signal CC1 is R3, which is 1.2K. In this state, the pull-down impedance of the control signal CC1 is between 800 and 1200 ohms. The back clip is recognized by the mobile phone as a power supply cable and the UFP device is not connected. In this case, the mobile phone does not supply power to the outside.

[0024] The back clip has a built-in mechanical switch Switch1. When the back clip needs to work with a mobile phone alone, the mechanical switch Switch1 is turned off, so that the control signal CC1 signal pull-down circuit is disconnected. The control signal CC1 signal is only controlled by the Type-C controller. The controller CC interface has a dead battery function, which triggers the mobile phone to power the back clip. At this time, the power supply from the mobile phone to the back clip is also used for the NMOS pin. Similarly, once the back clip is used, the mechanical switch is closed. The control signal CC1 pull-down path is turned on, and the mobile phone stops supplying power to the back clip.

[0025] When the back clip is connected to an external charger, the external charger directly powers the back clip and the mobile phone.

[0026] In the Type-C socket of the back clip, one of the four ground pins (for example, pin A1) is no longer grounded, but a separate signal is led out as the external USB device insertion signal (USB_DEVICE_DET). When the external USB device is not inserted, the signal is in high impedance state; When an external USB device is inserted, this signal is grounded. The USB_DEVICE_DET signal is connected to the gate of the NMOS tube Q1 in series on the control signal CC1 pull-down circuit. When an external USB device is inserted, the NMOS tube Q1 is turned off, the control signal CC1 signal pull-down circuit is disconnected, and the control signal CC1 signal is only controlled by the Type-C controller. The controller CC interface has a dead battery function, which triggers the mobile phone to power the back clip. Similarly, once the external USB device is unplugged after use, the NMOS tube Q1 is turned on, and the control signal CC1 pull-down path is turned on. At this time, the mobile phone stops supplying power to the back clip.

[0027] The above are only preferred embodiments of the present invention, which are only used to help understand the method and core idea of ​​the present application. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention. The present invention solves the shortcomings of the prior art that the power consumption of the mobile phone increases sharply due to the back clip identifying the external device and the back clip needing the mobile phone to power it in real time. By utilizing the idle CC signal in the plug and the mechanical switch and trigger circuit design in the circuit, controllable power supply is achieved, which ensures the normal use function of the back clip while reducing the power consumption of the mobile phone to a minimum.

Claims

1. A power circuit for a back clip product, characterized in that: The Type-C plug of the back clip is provided with a control signal 1 (CC1) signal and a control signal 2 (CC2) signal. The control signal 2 (CC2) signal 1 of the Type-C plug is periodically pulled high by the connected mobile phone to detect the insertion of an adapter or an external USB device. The control signal 1 (CC1) of the Type-C plug is connected to the Type-C controller in the back clip. The control signal 1 (CC1) signal of the Type-C plug is connected in series with a resistor 3 (R3). The resistor 3 (R3) is connected in series with a normally closed switch (Switch1). The normally closed switch (Switch1) is connected in series with the drain of a NOMS tube (Q1). The source of the NOMS tube (Q1) is grounded. The power supply of the Type-C plug is connected to the back clip system power supply after being connected to a series voltage regulator (LDO), and the back clip system power supply is connected to a series resistor 2 (R2) after passing through a diode; The control signal 2 (CC2) of the Type-C plug passes through the diode in series with the resistor 1 (R1); The back clip system power supply, the CC2 signal, and the Type-C socket output external USB device insertion signal are connected in parallel, then grounded through a capacitor (C1) and connected to the gate of the NOMS tube (Q1); A GND pin of the Type-C socket is not grounded and outputs an external USB device insertion signal; The external USB device insertion signal is connected to the gate of the NOMS tube (Q1).

2. The power supply circuit of the back clip product according to claim 1, characterized in that: The Type-C socket is connected to other external devices via USB.

3. The power supply circuit of the back clip product according to claim 1, characterized in that: The resistance value of the resistor three (R3) is 800-1200 ohms.

4. The power circuit of the back clip product according to claim 1, characterized in that: The normally closed switch (Switch1) is a mechanical switch.

5. The power supply circuit of the back clip product according to claim 1, characterized in that: The gate of the NOMS tube (Q1) is simultaneously controlled by the control signal 2 (CC2), the back clip system power supply, and the external USB device insertion signal.

6. The power supply circuit of the back clip product according to claim 1, characterized in that: The control signal 2 (CC2) is RC filtered before being connected to the gate of the NOMS tube (Q1).

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