Mobile phone power supply and charged switching circuit

Abstract

The utility model relates to the technical field of mobile phone circuits, and discloses a mobile phone power supply and charged switching circuit, which comprises a power switch circuit, a power switching circuit and a charging circuit, the charging circuit comprises a power supply port TYPE-CF1 end and a mobile phone interface TYPE-CF2 end, and the power switching circuit comprises an MOS tube Q1, an MOS tube Q2, an MOS tube Q3, an MOS tube Q4 and a management chip U1. The D end of the MOS tube Q1 is electrically connected with one end of the resistor R3, and the other end of the resistor R3 is electrically connected with the D3V3 end; according to whether the adapter power supply is connected or not and whether the sound card has PD5V or not, an MOS tube of the power supply switching circuit is conducted or cut off, and whether the CC is in a pull-up state or a pull-down state is automatically switched, so that whether the mobile phone is in an external power supply state or a charged state is changed.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile phone circuits, in particular to a mobile phone power supply and charging switching circuit. Background Art

[0002] With the development of science and technology, more and more mobile live broadcast software have appeared in people's field of vision. Many times, people want to show their living environment, party scenes, travel scenes, personal talents, etc. to relatives and friends in other places through live broadcast.

[0003] In a mobile phone live broadcast sound card solution, the phone sometimes needs to power the sound card. However, since the phone consumes power while broadcasting live and supplying power to the sound card at the same time, the power consumption is high. In this case, the power adapter must charge the phone and supply power to the sound card. Therefore, the phone has to switch between supplying power to the sound card and being charged by the adapter. Previous solutions all required a PD charging protocol chip, but this chip is expensive and takes a long time to select, resulting in poor actual use efficiency.

[0004] In view of this, we propose a mobile phone power supply and charging switching circuit. Utility Model Content

[0005] The purpose of the present utility model is to provide a mobile phone power supply and charging switching circuit to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a mobile phone power supply and charging switching circuit, including a power switch circuit, a power switching circuit, and a charging circuit. The charging circuit includes a power supply port TYPE-CF1 and a mobile phone interface TYPE-CF2. The power switching circuit includes MOS transistors Q1, Q2, Q3, and Q4, and a management chip U1.

[0007] The D terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the D3V3 terminal, the S terminal of the MOS transistor Q1 is electrically connected to the S terminal of the MOS transistor Q2, the D terminal of the MOS transistor Q2 is grounded through the resistor R7, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the G terminal of the MOS transistor Q2, the G terminal of the MOS transistor Q2 is electrically connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R4, the other end of the resistor R4 is electrically connected to the PD_5V terminal;

[0008] The 1 terminal of the management chip U1 is electrically connected to the VCC_5V terminal, and the 5 terminal of the management chip U1 is electrically connected to the D3V3 terminal.

[0009] Optionally, two terminals of the management chip U1 are grounded, two terminals of the management chip U1 are electrically connected to one terminal of the capacitor C3, and the other terminal of the capacitor C3 is electrically connected to one terminal of the management chip U1.

[0010] Optionally, terminal 5 of the management chip U1 is electrically connected to one end of a capacitor C2, the other end of the capacitor C2 is grounded, and the capacitor C2 is connected in parallel with the capacitor C1.

[0011] Optionally, the power switch circuit includes a MOS transistor Q6 and a MOS transistor Q7, a D terminal of the MOS transistor Q7 is electrically connected to the PD_5V terminal, and an S terminal of the MOS transistor Q7 is electrically connected to the VCC_5V terminal.

[0012] Optionally, the S end of the MOS transistor Q6 is electrically connected to the resistor R17 and the resistor R20 respectively, the G end of the MOS transistor Q6 is electrically connected to one end of the resistor R19, the other end of the resistor R19 is electrically connected to the positive end of the diode D1, the negative end of the diode D1 is electrically connected to one end of the resistor R18, and the other end of the resistor R18 is electrically connected to the G end of the MOS transistor Q7.

[0013] Optionally, the positive electrode of the diode D1 is electrically connected to the collector terminal of the transistor Q8, the base terminal of the transistor Q8 is electrically connected to one end of the resistor R21, one end of the resistor R21 is electrically connected to one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is electrically connected to the KT_5V_DET terminal, the negative electrode of the diode D1 is electrically connected to the collector terminal of the transistor Q5, the base terminal of the transistor Q5 is electrically connected to one end of the resistor R14, one end of the resistor R14 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is electrically connected to the PD_5V_DET terminal.

[0014] Compared with the prior art, the present invention provides a mobile phone power supply and charging switching circuit, which has the following beneficial effects:

[0015] The mobile phone power supply and charging switching circuit turns on or off the MOS tube of the power switching circuit according to whether the adapter power is connected and whether the sound card has PD_5V, and automatically switches the CC to a pull-up state or a pull-down state, thereby changing whether the mobile phone is in an external power supply state or a charging state. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the power switch circuit and the charging circuit of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the power switching circuit of the utility model; DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figure 1-Figure 2 As shown, the utility model provides a technical solution: a mobile phone power supply and charging switching circuit, including a power switch circuit, a power switching circuit and a charging circuit. The charging circuit includes a power supply port TYPE-CF1 and a mobile phone interface TYPE-CF2. The power switching circuit includes MOS transistors Q1, MOS transistors Q2, MOS transistors Q3, MOS transistors Q4 and a management chip U1.

[0020] The D terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the D3V3 terminal, the S terminal of the MOS transistor Q1 is electrically connected to the S terminal of the MOS transistor Q2, the D terminal of the MOS transistor Q2 is grounded through the resistor R7, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the G terminal of the MOS transistor Q2, the G terminal of the MOS transistor Q2 is electrically connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R4, and the other end of the resistor R4 is electrically connected to the PD_5V terminal;

[0021] Terminal 1 of the management chip U1 is electrically connected to the VCC_5V terminal, and terminal 5 of the management chip U1 is electrically connected to the D3V3 terminal.

[0022] Two terminals of the management chip U1 are grounded, two terminals of the management chip U1 are electrically connected to one terminal of the capacitor C3, and the other terminal of the capacitor C3 is electrically connected to one terminal of the management chip U1.

[0023] Terminal 5 of the management chip U1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, and the capacitor C2 is connected in parallel with the capacitor C1.

[0024] The power switch circuit includes MOS transistors Q6 and Q7. The D terminal of MOS transistor Q7 is electrically connected to the PD_5V terminal, and the S terminal of MOS transistor Q7 is electrically connected to the VCC_5V terminal. The S terminal of MOS transistor Q6 is electrically connected to resistors R17 and R20, respectively. The G terminal of MOS transistor Q6 is electrically connected to one end of resistor R19. The other end of resistor R19 is electrically connected to the positive terminal of diode D1. The negative terminal of diode D1 is electrically connected to one end of resistor R18. The other end of resistor R18 is electrically connected to the G terminal of MOS transistor Q7.

[0025] The anode of the diode D1 is electrically connected to the collector terminal of the transistor Q8, the base terminal of the transistor Q8 is electrically connected to one end of the resistor R21, one end of the resistor R21 is electrically connected to one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is electrically connected to the KT_5V_DET terminal, the cathode of the diode D1 is electrically connected to the collector terminal of the transistor Q5, the base terminal of the transistor Q5 is electrically connected to one end of the resistor R14, one end of the resistor R14 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is electrically connected to the PD_5V_DET terminal.

[0026] When the power port is not connected to the sound card and the mobile phone is connected to the sound card:

[0027] like Figure 1 As shown, since the power supply port is not connected, the PD_5V of the sound card has no power supply, the MOS tube Q1 / MOS tube Q3 is cut off, and the MOS tube Q2 / MOS tube Q4 is turned on. The CC1 / CC2 of the TYPE-CF on the mobile phone is connected to the ground with a pull-down resistor of 5.1K. According to the TYPE-C charging protocol, the mobile phone is in the state of external power supply. Figure 2 As shown, at this time, PD_5V is not powered, PD_5V_DET has no voltage, transistor Q5 is cut off, and MOS tube Q7 is not conducting; KT_5V is powered, KT_5V_DET has voltage, transistor Q8 is conducting, MOS tube Q6 is conducting, and the mobile phone supplies power to the sound card;

[0028] When the power port is connected to the sound card and the mobile phone is connected to the sound card:

[0029] like Figure 1 As shown, at this time, the power supply port is connected to the sound card, PD_5V has power, MOS tube Q1 / MOS tube Q3 is turned on, and because the drain of MOS tube Q1 / MOS tube Q3 is connected to 3.3V, the gate of MOS tube Q1 / MOS tube Q3 will not exceed 5V, MOS tube Q1 / MOS tube Q3 will continue to be turned on, while MOS tube Q2 / MOS tube Q4 is turned off, and CC1 / CC2 of TYPE-CF on the mobile phone end is pulled up to 3.3V, and is now in a charging state. Figure 2 As shown, because PD_5V is supplying power, PD_5V_DET has a voltage of 2.5V at this time, the transistor Q5 is turned on, making the MOS transistor Q6 / MOS transistor Q7 turned on. At this time, the power supply port not only supplies power to the sound card, but also charges the mobile phone.

[0030] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A mobile phone power supply and charging switching circuit, characterized by: It includes a power switch circuit, a power switching circuit and a charging circuit. The charging circuit includes a power supply port TYPE-CF1 and a mobile phone interface TYPE-CF2. The power switching circuit includes MOS transistors Q1, Q2, Q3, Q4 and a management chip U1. The D terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R3, the other end of the resistor R3 is electrically connected to the D3V3 terminal, the S terminal of the MOS transistor Q1 is electrically connected to the S terminal of the MOS transistor Q2, the D terminal of the MOS transistor Q2 is grounded through the resistor R7, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the G terminal of the MOS transistor Q2, the G terminal of the MOS transistor Q2 is electrically connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the G terminal of the MOS transistor Q1 is electrically connected to one end of the resistor R4, the other end of the resistor R4 is electrically connected to the PD_5V terminal; The 1 terminal of the management chip U1 is electrically connected to the VCC_5V terminal, and the 5 terminal of the management chip U1 is electrically connected to the D3V3 terminal.

2. The mobile phone power supply and charging switching circuit according to claim 1, characterized in that: Two terminals of the management chip U1 are grounded, the two terminals of the management chip U1 are electrically connected to one terminal of the capacitor C3, and the other terminal of the capacitor C3 is electrically connected to one terminal of the management chip U1.

3. The mobile phone power supply and charging switching circuit according to claim 2, characterized in that: The terminal 5 of the management chip U1 is electrically connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, and the capacitor C2 is connected in parallel with the capacitor C1.

4. The mobile phone power supply and charging switching circuit according to claim 1, characterized in that: The power switch circuit includes a MOS transistor Q6 and a MOS transistor Q7. The D terminal of the MOS transistor Q7 is electrically connected to the PD_5V terminal, and the S terminal of the MOS transistor Q7 is electrically connected to the VCC_5V terminal.

5. The mobile phone power supply and charging switching circuit according to claim 4, characterized in that: The S terminal of the MOS transistor Q6 is electrically connected to the resistor R17 and the resistor R20 respectively. The G terminal of the MOS transistor Q6 is electrically connected to one end of the resistor R19. The other end of the resistor R19 is electrically connected to the positive terminal of the diode D1. The negative terminal of the diode D1 is electrically connected to one end of the resistor R18. The other end of the resistor R18 is electrically connected to the G terminal of the MOS transistor Q7.

6. The mobile phone power supply and charging switching circuit according to claim 5, characterized in that: The positive electrode of the diode D1 is electrically connected to the collector terminal of the transistor Q8, the base terminal of the transistor Q8 is electrically connected to one end of the resistor R21, one end of the resistor R21 is electrically connected to one end of the resistor R22, the other end of the resistor R22 is grounded, the other end of the resistor R21 is electrically connected to the KT_5V_DET terminal, the negative electrode of the diode D1 is electrically connected to the collector terminal of the transistor Q5, the base terminal of the transistor Q5 is electrically connected to one end of the resistor R14, one end of the resistor R14 is electrically connected to one end of the resistor R13, the other end of the resistor R13 is grounded, and the other end of the resistor R14 is electrically connected to the PD_5V_DET terminal.

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