Sound box charging circuit

Abstract

The utility model discloses a sound box charging circuit, and relates to the technical field of sound box charging. According to the main technical scheme, the charger comprises a charging module and a power supply module, wherein the charging module comprises a charging interface unit and a charging control unit; the input end of the charging interface unit is used for being connected with an input power supply and a sound box control module, and the charging interface unit is connected with the charging control unit; the input end of the charging control unit is used for being connected with a sound box control module, and the output end of the charging control unit is used for being connected with a sound box power supply battery; the power supply module is connected with the charging interface unit; the output end of the power supply module is connected with the input end of the charging control unit, and the output end of the power supply module is used for being connected with a sound box control module. The objective of effectively reducing the risk probability caused by the over-high temperature of the power supply battery of the sound box is achieved. Meanwhile, the purposes of improving the charging speed and shortening the charging time of the sound box are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sound box charging technical field, concretely relates to a sound box charging circuit. BACKGROUND

[0002] The sound box is the terminal of the whole sound box system, and its role is to convert audio electric energy into corresponding sound energy and radiate the sound energy to space. The existing sound box has the problems of slow charging speed and long sound box charging time when charging. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a sound box charging circuit, and solves the problems of slow charging speed and long sound box charging time when charging the existing sound box.

[0004] To solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A sound box charging circuit, comprising a charging module and a power module, the charging module comprising a charging interface unit and a charging control unit; the input end of the charging interface unit is used for being connected with an input power supply and a sound box control module, and the charging interface unit is connected with the charging control unit; the input end of the charging control unit is used for being connected with the sound box control module, and the output end of the charging control unit is used for being connected with a sound box power supply battery; the power module is connected with the charging interface unit; the output end of the power module is connected with the input end of the charging control unit, and the output end of the power module is used for being connected with the sound box control module.

[0006] Further technical solutions are: the charging interface unit includes an interface part and a fast charging control part; the interface part includes a power interface J08, a resistor R80, a resistor R81, a capacitor C19, a capacitor C21, an inductor L7 and an inductor L11; one end of the power interface J08, 17 of the power interface J08, 8A12 of the power interface J08, 20 of the power interface J08, 9B12 of the power interface J08, 18 of the power interface J08, 16B1 of the power interface J08, 19 of the power interface J08, one end of the resistor R80, one end of the resistor R81, one end of the capacitor C19 are all connected with one end of the capacitor C21; one end of the capacitor C21 is connected with GND; 3A5 of the power interface J08 is connected with the other end of the resistor R81; 14B5 of the power interface J08 is connected with the other end of the resistor R80; 2A4 of the power interface J08, 7A9 of the power interface J08, 10B9 of the power interface J08, 15B4 of the power interface J08, the other end of the capacitor C19 are all connected with the other end of the capacitor C21; the other end of the capacitor C21 is connected with an input end of the charging control unit and an input end of the power module; 4A6 of the power interface J08 and 13B6 of the power interface J08 are all connected with one end of the inductor L7; the other end of the inductor L7 is connected with the fast charging control part; 5A67 of the power interface J08 and 12B7 of the power interface J08 are all connected with one end of the inductor L11; the other end of the inductor L11 is connected with the fast charging control part; an input end of the fast charging control part is connected with an output end of the power module and an output end of the charging control unit.

[0007] Further technical solutions are: the fast charging control part includes a high-speed differential analog switch IC2, a resistor R94, a resistor R95, a capacitor C24 and a diode D17; the high-speed differential analog switch IC2 is SGM7222; the No. 1 pin of the high-speed differential analog switch IC2 is connected with one end of the resistor R95, and the No. 1 pin of the high-speed differential analog switch IC2 is used for connecting with S of the sound box control module; the other end of the resistor R95 is connected with GND; the No. 3 pin of the high-speed differential analog switch IC2 is connected with the charging control unit; the No. 4 pin of the high-speed differential analog switch IC2 is connected with the other end of the inductor L7; the No. 5 pin of the high-speed differential analog switch IC2 is connected with GND; the No. 6 pin of the high-speed differential analog switch IC2 is connected with the other end of the inductor L11; the No. 7 pin of the high-speed differential analog switch IC2 is connected with the charging control unit; the No. 9 pin of the high-speed differential analog switch IC2 is connected with GND; the No. 10 pin of the high-speed differential analog switch IC2 is connected with the negative electrode of the diode D17 and one end of the capacitor C24; the other end of the capacitor C24 is connected with GND; the positive electrode of the diode D17 is connected with one end of the resistor R94; the other end of the resistor R94 is connected with the output end of the power module.

[0008] Further technical solutions are: the charging control unit includes a control part and a switch part; the switch part includes an inductor L6, a triode Q11, a triode Q13, a capacitor C11, a resistor R30, a resistor R31, a resistor R107, a resistor R108, a resistor R109, a resistor R110 and a MOS tube Q12; one end of the inductor L6 is connected with the other end of the capacitor C21; the other end of the inductor L6 is connected with one end of the resistor R30, one end of the resistor R107 and the source of the MOS tube Q12; the other end of the resistor R30 is connected with the base of the triode Q11 and one end of the resistor R31; the other end of the resistor R31 is connected with GND; the collector of the triode Q11 is used for being connected with AC_DET of the sound box control module; the emitter of the triode Q11 is connected with GND; one end of the capacitor C11 is connected with the collector of the triode Q11, and the other end of the capacitor C11 is connected with the emitter of the triode Q11; the other end of the resistor R107 and the gate of the MOS tube Q12 are connected with one end of the resistor R108; the other end of the resistor R107 is connected with the collector of the triode Q13; the emitter of the triode Q13 is connected with GND; the base of the triode Q13 is connected with one end of the resistor R110 and one end of the resistor R109; the other end of the resistor R109 is used for being connected with CHG_ON of the sound box control module; the other end of the resistor R110 is connected with GND; the input end of the control part is connected with the drain of the MOS tube Q12 and the output end of the power module; the output end of the control part is connected with pin 3 of the high-speed differential analog switch IC2 and pin 7 of the high-speed differential analog switch IC2, and the output end of the control part is used for being connected with the sound box power supply battery.

[0009] Further technical solutions are: the control part includes control chip U6, resistor R105, resistor R106, capacitor C116, capacitor C117, capacitor C118, capacitor C120 and common mode inductor LA1; the control chip U6 is IP2326; the No. 1 pin of the control chip U6 is connected with the No. 7 pin of the high-speed differential analog switch IC2; the No. 2 pin of the control chip U6 is connected with the No. 3 pin of the high-speed differential analog switch IC2; the No. 3 pin of the control chip U6 is connected with one end of the resistor R106; the other end of the resistor R106 is connected with GND; the No. 4 pin of the control chip U6 is connected with one end of the resistor R105, and the No. 4 pin of the control chip U6 is used for connecting with the NTC of the sound box power supply battery; the other end of the resistor R105 is connected with the other end of the resistor R106; the No. 6 pin of the control chip U6, the No. 8 pin of the control chip U6, the No. 10 pin of the control chip U6, the No. 11 pin of the control chip U6 are all used for connecting with the CHG_DET of the sound box control module; the No. 12 pin of the control chip U6, the No. 13 pin of the control chip U6, the No. 14 pin of the control chip U6, the No. 15 pin of the control chip U6, the No. 16 pin of the control chip U6, the No. 17 pin of the control chip U6 are all connected with the drain of the MOS tube Q12; the No. 18 pin of the control chip U6 is connected with one end of the capacitor C116; the other end of the capacitor C116 is connected with GND; the No. 19 pin of the control chip U6 is connected with the other end of the capacitor C116, one end of the capacitor C117, the No. 20 pin of the control chip U6; the other end of the capacitor C117 is connected with GND; the No. 21 pin of the control chip U6, the No. 22 pin of the control chip U6, one end of the capacitor C120, one end of the capacitor C118 are all connected with the No. 1 pin of the common mode inductor KLA1; the No. 1 pin of the common mode inductor LA1 is used for connecting with the BATT of the sound box power supply battery; the No. 3 pin of the common mode inductor LA1 is connected with the other end of the capacitor C120 and the other end of the capacitor C118; the No. 3 pin of the common mode inductor LA1 is connected with GND, and the No. 3 pin of the common mode inductor LA1 is used for connecting with the GND of the sound box power supply battery; the No. 2 pin of the common mode inductor LA1 is connected with the power supply module; the No. 4 pin of the common mode inductor LA1 is connected with GND.

[0010] Further technical solutions are: the control part further includes resistance R77, resistance R78, resistance R79, resistance R60, resistance R3 and capacitor C16; one end of the resistance R3 is connected with the No. 6 pin of the control chip U6, and the other end of the resistance R3 is used for connecting with CHG_DET of the sound box control module; one end of the resistance R79 is connected with the No. 8 pin of the control chip U6, and the other end of the resistance R79 is connected with GND; one end of the resistance R78 is connected with the No. 10 pin of the control chip U6; one end of the resistance R77 is connected with the No. 11 pin of the control chip U6; the other end of the resistance R77, the other end of the resistance R78, the other end of the resistance R79 and one end of the resistance R60 are all connected with one end of the capacitor C16; the other end of the capacitor C16 and the other end of the resistance R60 are both connected with the other end of the resistance R3.

[0011] Further technical solutions are: the control part further includes inductance L10, resistance R20, resistance R33, capacitor C114 and capacitor C22; one end of the resistance R33 is connected with the No. 12 pin of the control chip U6; the other end of the resistance R33, one end of the capacitor C22 and one end of the resistance R20 are all connected with the No. 13 pin of the control chip U6; the other end of the capacitor C22 is connected with GND; the other end of the resistance R20 and one end of the inductance L10 are both connected with the drain of the MOS tube Q12; the other end of the inductance L10 is connected with the No. 15 pin of the control chip U6, the No. 16 pin of the control chip U6, the No. 17 pin of the control chip U6 and one end of the capacitor C114; the other end of the capacitor C114 is connected with the No. 14 pin of the control chip U6.

[0012] A further technical solution is: the power module includes a power interface unit and a power control unit; the power interface unit includes resistors R29, R34, R35, R36, R37, R39, diode D19, Schottky diode Q1, triode Q3, MOS tube Q4, capacitors C12, C13 and C58; one end of the resistor R29 is connected to the other end of the capacitor C21; the other end of the resistor R29 is connected to the positive electrode of the diode D19; one end of the resistor R36 is used to connect with the POWER_ON of the sound box control module; the other end of the resistor R36, one end of the resistor R37 and the negative electrode of the diode D19 are all connected to the base of the triode Q3; the other end of the resistor R37 and the emitter of the triode Q3 are respectively connected to GND; the collector of the triode Q3 is connected to one end of the resistor R35 and the pin 1 of the Schottky diode Q1; the pin 2 of the Schottky diode Q1 is used to connect with the POWER_KEY of the sound box control module; the pin 3 of the Schottky diode Q1 is used to connect with the SW of the sound box control module; the other end of the resistor R35 is connected to the gate of the MOS tube Q4 and one end of the resistor R34; the source of the MOS tube Q4 and the other end of the resistor R34 are both connected to the pin 2 of the common mode inductor LA1; the drain of the MOS tube Q4 is connected to one end of the resistor R38, one end of the capacitor C13, one end of the capacitor C58 and the input end of the power control unit; the output end of the power control unit is connected to the other end of the resistor R94, and the output end of the power control unit is used to connect with the sound box control module; the other end of the resistor R38 is connected to one end of the resistor R39 and one end of the capacitor C12, and the other end of the resistor R38 is used to connect with the BAT_DET of the sound box control module; the other end of the resistor R39, the other end of the capacitor C12, the other end of the capacitor C13 and the other end of the capacitor C58 are all connected to GND.

[0013] Further technical solutions are: the power supply control unit includes power chip U1, resistance R40, resistance R15, resistance R18, capacitor C17, capacitor C59, electrolytic capacitor EC2, inductor L8 and diode D2;The power chip U1 is LP6460;The 5th pin of the power chip U1, one end of the resistance R40 are connected with the drain of the MOS tube Q4;The 4th pin of the power chip U1 is connected with the other end of the resistance R40;The 1st pin of the power chip U1 is connected with one end of the capacitor C17;The 6th pin of the power chip U1 is connected with the other end of the capacitor C17 and one end of the inductor L8;The 3rd pin of the power chip U1 is connected with one end of the resistance R15 and one end of the resistance R18;The 2nd pin of the power chip U1 and the other end of the resistance R15 are all connected with GND;The other end of the resistance R18, the other end of the inductor L8, one end of the capacitor C59, the positive electrode of the electrolytic capacitor EC2 and the positive electrode of the diode D2 are all connected with the other end of the resistance R94;The other end of the capacitor C59 and the negative electrode of the electrolytic capacitor EC2 are all connected with GND;The negative electrode of the diode D2 is used for being connected with A5V of the sound box control module.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] On the one hand, the charging control unit detects the temperature inside the sound box power supply battery, and reduces the charging current or stops charging based on the temperature inside the sound box power supply battery. The purpose of effectively reducing the risk probability caused by the high temperature of the sound box power supply battery is achieved. On the other hand, the charging interface unit is connected with the charging control unit, and provides fast charging voltage for the sound box power supply battery. The purpose of effectively improving the charging speed and shortening the sound box charging time is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an electrical block diagram of the sound box charging circuit in the embodiment;

[0017] Figure 2 It is a circuit structure topology graph of the charging interface unit of the sound box charging circuit in the embodiment;

[0018] Figure 3 It is a circuit structure topology graph of the charging control unit of the sound box charging circuit in the embodiment;

[0019] Figure 4 It is a circuit structure topology graph of the power module of the sound box charging circuit in the embodiment. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings.

[0021] EMBODIMENT

[0022] The embodiment provides a sound box charging circuit, which comprises a charging module and a power module, as shown in the figure. Figure 1 The input end of the charging interface unit is used for being connected with an input power supply and a sound box control module, the charging interface unit is connected with the charging control unit, the input end of the charging control unit is used for being connected with the sound box control module, the output end of the charging control unit is used for being connected with a sound box power supply battery, the power module is connected with the charging interface unit, the output end of the power module is connected with the input end of the charging control unit, and the output end of the power module is used for being connected with the sound box control module.

[0023] In the embodiment, as shown in the figure, Figure 2 The charging interface unit comprises an interface part and a fast charging control part, the interface part comprises a power interface J08, a resistor R80, a resistor R81, a capacitor C19, a capacitor C21, an inductor L7 and an inductor L11, one end of the power interface J08, one end of the power interface J08, one end of the power interface J08, one end of the power interface J08, one end of the power interface J08, one end of the power interface J08, one end of the power interface J08, one end of the resistor R80, one end of the resistor R81, one end of the capacitor C19 and one end of the capacitor C21 are connected with one end of the capacitor C21, one end of the capacitor C21 is connected with GND, 3A5 of the power interface J08 is connected with the other end of the resistor R81, 14B5 of the power interface J08 is connected with the other end of the resistor R80, 2A4 of the power interface J08, 7A9 of the power interface J08, 10B9 of the power interface J08, 15B4 of the power interface J08 and the other end of the capacitor C19 are connected with the other end of the capacitor C21, the other end of the capacitor C21 is connected with the input end of the charging control unit and the input end of the power module, 4A6 of the power interface J08 and 13B6 of the power interface J08 are connected with one end of the inductor L7, the other end of the inductor L7 is connected with the fast charging control part, 5A67 of the power interface J08 and 12B7 of the power interface J08 are connected with one end of the inductor L11, the other end of the inductor L11 is connected with the fast charging control part, and the input end of the fast charging control part is connected with the output end of the power module and the output end of the charging control unit.

[0024] In the embodiment, as shown in the figure, Figure 2As shown, the fast charging control part includes a high-speed differential analog switch IC2, a resistor R94, a resistor R95, a capacitor C24 and a diode D17; the high-speed differential analog switch IC2 is SGM7222; the No.1 pin of the high-speed differential analog switch IC2 is connected with one end of the resistor R95, and is used for connecting with S of the sound box control module; the other end of the resistor R95 is connected with GND; the No.3 pin of the high-speed differential analog switch IC2 is connected with the charging control unit; the No.4 pin of the high-speed differential analog switch IC2 is connected with the other end of the inductor L7; the No.5 pin of the high-speed differential analog switch IC2 is connected with GND; the No.6 pin of the high-speed differential analog switch IC2 is connected with the other end of the inductor L11; the No.7 pin of the high-speed differential analog switch IC2 is connected with the charging control unit; the No.9 pin of the high-speed differential analog switch IC2 is connected with GND; the No.10 pin of the high-speed differential analog switch IC2 is connected with the negative electrode of the diode D17 and one end of the capacitor C24; the other end of the capacitor C24 is connected with GND; the positive electrode of the diode D17 is connected with one end of the resistor R94; the other end of the resistor R94 is connected with the output end of the power module.

[0025] In the embodiment, as Figure 3As shown, the charging control unit includes a control part and a switch part; the switch part includes inductor L6, triode Q11, triode Q13, capacitor C11, resistor R30, resistor R31, resistor R107, resistor R108, resistor R109, resistor R110 and MOS tube Q12; one end of the inductor L6 is connected with the other end of the capacitor C21; the other end of the inductor L6 is connected with one end of the resistor R30, one end of the resistor R107 and the source of the MOS tube Q12; the other end of the resistor R30 is connected with the base of the triode Q11 and one end of the resistor R31; the other end of the resistor R31 is connected with GND; the collector of the triode Q11 is used for being connected with AC_DET of the sound box control module; the emitter of the triode Q11 is connected with GND; one end of the capacitor C11 is connected with the collector of the triode Q11, and the other end of the capacitor C11 is connected with the emitter of the triode Q11; the other end of the resistor R107 and the gate of the MOS tube Q12 are both connected with one end of the resistor R108; the other end of the resistor R107 is connected with the collector of the triode Q13; the emitter of the triode Q13 is connected with GND; the base of the triode Q13 is connected with one end of the resistor R110 and one end of the resistor R109; the other end of the resistor R109 is used for being connected with CHG_ON of the sound box control module; the other end of the resistor R110 is connected with GND; the input end of the control part is connected with the drain of the MOS tube Q12 and the output end of the power module; the output end of the control part is connected with pin 3 of the high-speed differential analog switch IC2 and pin 7 of the high-speed differential analog switch IC2, and the output end of the control part is used for being connected with the sound box power supply battery.

[0026] In the embodiment, as shown in Figure 3As shown, the control part includes control chip U6, resistor R105, resistor R106, capacitor C116, capacitor C117, capacitor C118, capacitor C120 and common mode inductor LA1; the control chip U6 is IP2326; the No.1 pin of the control chip U6 is connected with the No.7 pin of the high-speed differential analog switch IC2; the No.2 pin of the control chip U6 is connected with the No.3 pin of the high-speed differential analog switch IC2; the No.3 pin of the control chip U6 is connected with one end of the resistor R106; the other end of the resistor R106 is connected with GND; the No.4 pin of the control chip U6 is connected with one end of the resistor R105, and the No.4 pin of the control chip U6 is used for connecting with the NTC of the speaker power supply battery; the other end of the resistor R105 is connected with the other end of the resistor R106; the No.6 pin of the control chip U6, the No.8 pin of the control chip U6, the No.10 pin of the control chip U6, the No.11 pin of the control chip U6 are all used for connecting with the CHG_DET of the speaker control module; the No.12 pin of the control chip U6, the No.13 pin of the control chip U6, the No.14 pin of the control chip U6, the No.15 pin of the control chip U6, the No.16 pin of the control chip U6, the No.17 pin of the control chip U6 are all connected with the drain of the MOS tube Q12; the No.18 pin of the control chip U6 is connected with one end of the capacitor C116; the other end of the capacitor C116 is connected with GND; the No.19 pin of the control chip U6 is connected with the other end of the capacitor C116, one end of the capacitor C117, the No.20 pin of the control chip U6; the other end of the capacitor C117 is connected with GND; the No.21 pin of the control chip U6, the No.22 pin of the control chip U6, one end of the capacitor C120, one end of the capacitor C118 are all connected with the No.1 pin of the common mode inductor KLA1; the No.1 pin of the common mode inductor LA1 is used for connecting with the BATT of the speaker power supply battery; the No.3 pin of the common mode inductor LA1 is connected with the other end of the capacitor C120 and the other end of the capacitor C118; the No.3 pin of the common mode inductor LA1 is connected with GND, and the No.3 pin of the common mode inductor LA1 is used for connecting with the GND of the speaker power supply battery; the No.2 pin of the common mode inductor LA1 is connected with the power supply module; the No.4 pin of the common mode inductor LA1 is connected with GND.

[0027] In the embodiment, as Figure 3As shown, the control part further comprises resistance R77, resistance R78, resistance R79, resistance R60, resistance R3 and capacitor C16; one end of the resistance R3 is connected with No. 6 pin of the control chip U6, and the other end of the resistance R3 is used for connecting with CHG_DET of the sound box control module; one end of the resistance R79 is connected with No. 8 pin of the control chip U6, and the other end of the resistance R79 is connected with GND; one end of the resistance R78 is connected with No. 10 pin of the control chip U6; one end of the resistance R77 is connected with No. 11 pin of the control chip U6; the other end of the resistance R77, the other end of the resistance R78, the other end of the resistance R79 and one end of the resistance R60 are all connected with one end of the capacitor C16; the other end of the capacitor C16 and the other end of the resistance R60 are both connected with the other end of the resistance R3.

[0028] In the embodiment, as shown in Figure 3 the control part further comprises inductance L10, resistance R20, resistance R33, capacitor C114 and capacitor C22; one end of the resistance R33 is connected with No. 12 pin of the control chip U6; the other end of the resistance R33, one end of the capacitor C22 and one end of the resistance R20 are all connected with No. 13 pin of the control chip U6; the other end of the capacitor C22 is connected with GND; the other end of the resistance R20 and one end of the inductance L10 are both connected with the drain of the MOS tube Q12; the other end of the inductance L10 is connected with No. 15 pin of the control chip U6, No. 16 pin of the control chip U6, No. 17 pin of the control chip U6 and one end of the capacitor C114; the other end of the capacitor C114 is connected with No. 14 pin of the control chip U6.

[0029] In the embodiment, as shown in Figure 4As shown, the power module includes a power interface unit and a power control unit; the power interface unit includes resistors R29, R34, R35, R36, R37, R39, a diode D19, a Schottky diode Q1, a triode Q3, a MOS tube Q4, capacitors C12, C13 and C58; one end of the resistor R29 is connected with the other end of the capacitor C21; the other end of the resistor R29 is connected with the positive electrode of the diode D19; one end of the resistor R36 is used for being connected with the POWER_ON of the sound box control module; the other end of the resistor R36, one end of the resistor R37 and the negative electrode of the diode D19 are all connected with the base of the triode Q3; the other end of the resistor R37 and the emitter of the triode Q3 are respectively connected with GND; the collector of the triode Q3 is connected with one end of the resistor R35 and the No.1 pin of the Schottky diode Q1; the No.2 pin of the Schottky diode Q1 is used for being connected with the POWER_KEY of the sound box control module; the No.3 pin of the Schottky diode Q1 is used for being connected with the SW of the sound box control module; the other end of the resistor R35 is connected with the gate of the MOS tube Q4 and one end of the resistor R34; the source of the MOS tube Q4 and the other end of the resistor R34 are all connected with the No.2 pin of the common mode inductor LA1; the drain of the MOS tube Q4 is connected with one end of the resistor R38, one end of the capacitor C13, one end of the capacitor C58 and the input end of the power control unit; the output end of the power control unit is connected with the other end of the resistor R94, and the output end of the power control unit is used for being connected with the sound box control module; the other end of the resistor R38 is connected with one end of the resistor R39 and one end of the capacitor C12, and the other end of the resistor R38 is used for being connected with the BAT_DET of the sound box control module; the other end of the resistor R39, the other end of the capacitor C12, the other end of the capacitor C13 and the other end of the capacitor C58 are all connected with GND.

[0030] In the embodiment, as Figure 4As shown, the power control unit includes a power chip U1, a resistor R40, a resistor R15, a resistor R18, a capacitor C17, a capacitor C59, an electrolytic capacitor EC2, an inductor L8 and a diode D2; the power chip U1 is LP6460; the No. 5 pin of the power chip U1 and one end of the resistor R40 are connected with the drain of the MOS tube Q4; the No. 4 pin of the power chip U1 is connected with the other end of the resistor R40; the No. 1 pin of the power chip U1 is connected with one end of the capacitor C17; the No. 6 pin of the power chip U1 is connected with the other end of the capacitor C17 and one end of the inductor L8; the No. 3 pin of the power chip U1 is connected with one end of the resistor R15 and one end of the resistor R18; the No. 2 pin of the power chip U1 and the other end of the resistor R15 are connected with GND; the other end of the resistor R18, the other end of the inductor L8, one end of the capacitor C59, the positive electrode of the electrolytic capacitor EC2 and the positive electrode of the diode D2 are connected with the other end of the resistor R94; the other end of the capacitor C59 and the negative electrode of the electrolytic capacitor EC2 are connected with GND; the negative electrode of the diode D2 is used to be connected with A5V of the sound box control module.

[0031] The working principle of the sound box charging circuit in the embodiment is as follows:

[0032] When the power interface J08 is connected with the input power, the triode Q3 is turned on, the gate (G terminal) of the triode Q4 is pulled low, the power chip U1 starts to work and outputs 5V voltage to A5V of the sound box control module and the high-speed differential analog switch IC2, so that the sound box control module and the high-speed differential analog switch IC2 start to work, to pull down AC_DET of the sound box control module and pull up CHG_ON of the sound box control module, thereby making the MOS tube Q12 conduct, to supply power to the control chip U6. At this time, the control chip U6 starts to work, the sound box control module pulls the No. 1 pin of the high-speed differential analog switch IC2, thereby making the No. 1 pin of the control chip U6 connected with the No. 7 pin of the high-speed differential analog switch IC2 and the No. 2 pin of the control chip U6 connected with the No. 3 pin of the high-speed differential analog switch IC2, to send a request for fast charging voltage, and make CHG_DET of the sound box control module pull up. After the sound box control module detects that CHG_DET is pulled up, it starts to charge the sound box power supply battery. The purpose of effectively improving the charging speed and shortening the sound box charging time is achieved.

[0033] Among them, the common mode inductor LA1 is used to eliminate charging interference.

[0034] The No. 4 pin of the control chip U6 is connected with the NTC of 100K in the sound box power supply battery. When the temperature of the sound box power supply battery is 45℃, the charging current of the sound box power supply battery is halved, and when the temperature of the sound box power supply battery exceeds 55℃, the charging is immediately stopped. The risk of danger caused by too high temperature of the sound box power supply battery is effectively reduced.

[0035] After the speaker battery stops charging, the CHG_DET of the CHG_DET of the speaker control module is pulled down, and the CHG_ON of the CHG_DET of the speaker control module is pulled down to stop supplying power to the control chip U6.

[0036] The control chip U6 is IP2326, and the switching frequency of the control chip U6 is 500KHz. After the output is boosted, the speaker battery configured as 3 series lithium batteries is charged. When the control chip U6 is 5V input and 12.0V / 1.2A output, the efficiency is 91.1%; when the control chip U6 is 9V input and 12V / 1.2A output, the efficiency is 94.8%.

[0037] The speaker charging circuit in this embodiment adopts complete CC / CV charging mode. During the charging of the speaker battery configured as 3 series lithium batteries, when the voltage of the speaker battery is less than 3.7V, the speaker battery is charged with a current of 50mA; when the voltage of the speaker battery is greater than 3.7V and less than 9V, the battery is charged with a current of 100mA; when the voltage of the speaker battery is greater than 9V, it is charged with a set constant current ICC; when the voltage of the speaker battery approaches 12.6V, it enters constant voltage charging mode. After the speaker battery is fully charged and stops charging, the input continues to exist, and if the voltage of the speaker battery is less than 12V, the charging will be started again; after entering the constant voltage mode, if the charging current is less than 200mA, the charging will stop after 30s, and whether the stopped voltage is higher than the voltage at the time of stopping charging is detected. If the stopped voltage is higher than the voltage at the time of stopping charging, the charging is stopped; if the stopped voltage is lower than the voltage at the time of stopping charging, the charging is continued, and the detection is continued after another 30s. The risk of damage to the speaker battery caused by overcharging, overdischarging and the like is effectively reduced.

[0038] When the voltage of the speaker battery is <= VBAT=10.5V, 9V input fast charging will be attempted; if the fast charging input fails, mechanical energy charging with 5V input will be performed.

[0039] The control chip U6 has a VIN input voltage stabilizing loop. When it is detected that the input voltage approaches the input undervoltage threshold set by RUV, it will automatically adjust and reduce the charging current to ensure that the input voltage is stable around the input undervoltage threshold, so as to ensure that the adapter will not be pulled down. When it is detected that the input voltage is greater than the overvoltage threshold set by ROV, the charging will be stopped.

[0040] While the present application has been described with reference to the numerous explanatory embodiments thereof, it is to be understood that various other modifications can be effected within the scope of the application, as described in the claims. More specifically, many variations and modifications will be apparent to those skilled in the art from the description and drawings herein, given the benefit of the description, drawings and claims as a whole. Other uses will be apparent to those skilled in the art.

Claims

1. A speaker charging circuit, characterized in that, include: A charging module, comprising a charging interface unit and a charging control unit; the input terminal of the charging interface unit is connected to both an input power supply and a speaker control module, and the charging interface unit is connected to the charging control unit; the input terminal of the charging control unit is connected to the speaker control module, and the output terminal of the charging control unit is connected to the speaker power supply battery; A power module is provided, which is connected to the charging interface unit; the output terminal of the power module is connected to the input terminal of the charging control unit, and the output terminal of the power module is used to connect to the speaker control module. The charging interface unit includes an interface part and a fast charging control part; The interface section includes a power interface J08, resistors R80 and R81, capacitors C19 and C21, inductors L7 and L11; pins 1A1, 17, 8A12, 20, 9B12, 18, 16B1, and 19 of power interface J08, one end of resistor R80, one end of resistor R81, and one end of capacitor C19 are all connected to one end of capacitor C21; one end of capacitor C21 is connected to GND; pin 3A5 of power interface J08 is connected to the other end of resistor R81; pin 14B5 of power interface J08 is connected to the other end of resistor R80; the power interface J08... The other end of 2A4, 7A9, 10B9, and 15B4 of power interface J08, and capacitor C19 are all connected to the other end of capacitor C21; the other end of capacitor C21 is connected to the input terminal of the charging control unit and the input terminal of the power module; 4A6 and 13B6 of power interface J08 are both connected to one end of inductor L7; the other end of inductor L7 is connected to the fast charging control section; 5A67 and 12B7 of power interface J08 are both connected to one end of inductor L11; the other end of inductor L11 is connected to the fast charging control section; the input terminal of the fast charging control section is connected to the output terminal of the power module and the output terminal of the charging control unit.

2. The speaker charging circuit according to claim 1, characterized in that: The fast charging control section includes a high-speed differential analog switch IC2, resistor R94, resistor R95, capacitor C24, and diode D17. The high-speed differential analog switch IC2 is an SGM7222; Pin 1 of the high-speed differential analog switch IC2 is connected to one end of resistor R95, and pin 1 of the high-speed differential analog switch IC2 is used to connect to S of the speaker control module. The other end of the resistor R95 is connected to GND; Pin 3 of the high-speed differential analog switch IC2 is connected to the charging control unit; Pin 4 of the high-speed differential analog switch IC2 is connected to the other end of the inductor L7; Pin 5 of the high-speed differential analog switch IC2 is connected to GND; Pin 6 of the high-speed differential analog switch IC2 is connected to the other end of the inductor L11; Pin 7 of the high-speed differential analog switch IC2 is connected to the charging control unit; Pin 9 of the high-speed differential analog switch IC2 is connected to GND; Pin 10 of the high-speed differential analog switch IC2 is connected to the negative terminal of diode D17 and one end of capacitor C24. The other end of capacitor C24 is connected to GND; The positive terminal of the diode D17 is connected to one end of the resistor R94; The other end of the resistor R94 is connected to the output terminal of the power module.

3. The speaker charging circuit according to claim 2, characterized in that: The charging control unit includes a control section and a switching section; The switching section includes inductor L6, transistor Q11, transistor Q13, capacitor C11, resistor R30, resistor R31, resistor R107, resistor R108, resistor R109, resistor R110 and MOSFET Q12. One end of the inductor L6 is connected to the other end of the capacitor C21; The other end of the inductor L6 is connected to one end of the resistor R30, one end of the resistor R107, and the source of the MOSFET Q12. The other end of the resistor R30 is connected to the base of the transistor Q11 and one end of the resistor R31. The other end of the resistor R31 is connected to GND; The collector of transistor Q11 is used to connect to the AC_DET of the speaker control module; The emitter of transistor Q11 is connected to GND; One end of the capacitor C11 is connected to the collector of the transistor Q11, and the other end of the capacitor C11 is connected to the emitter of the transistor Q11. The other end of resistor R107 and the gate of MOS transistor Q12 are both connected to one end of resistor R108. The other end of the resistor R107 is connected to the collector of the transistor Q13; The emitter of transistor Q13 is connected to GND; The base of the transistor Q13 is connected to one end of resistor R110 and one end of resistor R109. The other end of the resistor R109 is used to connect to CHG_ON of the speaker control module; The other end of the resistor R110 is connected to GND; The input terminal of the control section is connected to the drain of the MOS transistor Q12 and the output terminal of the power module. The output terminal of the control section is connected to pin 3 and pin 7 of the high-speed differential analog switch IC2, and the output terminal of the control section is used to connect to the speaker's power supply battery.

4. The speaker charging circuit according to claim 3, characterized in that: The control section includes a control chip U6, resistors R105 and R106, capacitors C116, C117, C118, C120, and a common-mode inductor LA1. The control chip U6 is IP2326; Pin 1 of the control chip U6 is connected to pin 7 of the high-speed differential analog switch IC2; Pin 2 of the control chip U6 is connected to pin 3 of the high-speed differential analog switch IC2; Pin 3 of the control chip U6 is connected to one end of the resistor R106; The other end of the resistor R106 is connected to GND; Pin 4 of the control chip U6 is connected to one end of the resistor R105, and pin 4 of the control chip U6 is used to connect to the NTC of the speaker's power supply battery. The other end of resistor R105 is connected to the other end of resistor R106; Pins 6, 8, 10, and 11 of the control chip U6 are all used to connect to the CHG_DET of the speaker control module. Pins 12, 13, 14, 15, 16, and 17 of the control chip U6 are all connected to the drain of the MOS transistor Q12. Pin 18 of the control chip U6 is connected to one end of the capacitor C116; The other end of the capacitor C116 is connected to GND; Pin 19 of the control chip U6 is connected to the other end of capacitor C116, one end of capacitor C117, and pin 20 of the control chip U6. The other end of the capacitor C117 is connected to GND; Pin 21 and pin 22 of the control chip U6, one end of capacitor C120, and one end of capacitor C118 are all connected to pin 1 of the common mode inductor KLA1. Pin 1 of the common mode inductor LA1 is used for BATT connection with the speaker power supply battery; Pin 3 of the common mode inductor LA1 is connected to the other end of capacitor C120 and the other end of capacitor C118. Pin 3 of the common mode inductor LA1 is connected to GND, and pin 3 of the common mode inductor LA1 is used to connect to GND of the speaker power supply battery. Pin 2 of the common-mode inductor LA1 is connected to the power module; Pin 4 of the common-mode inductor LA1 is connected to GND.

5. The speaker charging circuit according to claim 4, characterized in that: The control section also includes resistors R77, R78, R79, R60, R3, and capacitor C16. One end of the resistor R3 is connected to pin 6 of the control chip U6, and the other end of the resistor R3 is used to connect to CHG_DET of the speaker control module. One end of the resistor R79 is connected to pin 8 of the control chip U6, and the other end of the resistor R79 is connected to GND. One end of the resistor R78 is connected to pin 10 of the control chip U6; One end of the resistor R77 is connected to pin 11 of the control chip U6; The other end of resistor R77, the other end of resistor R78, the other end of resistor R79, and one end of resistor R60 are all connected to one end of capacitor C16. The other end of capacitor C16 and the other end of resistor R60 are both connected to the other end of resistor R3.

6. The speaker charging circuit according to claim 5, characterized in that: The control section also includes inductor L10, resistor R20, resistor R33, capacitor C114, and capacitor C22; One end of the resistor R33 is connected to pin 12 of the control chip U6; The other end of resistor R33, one end of capacitor C22, and one end of resistor R20 are all connected to pin 13 of control chip U6. The other end of capacitor C22 is connected to GND; The other end of the resistor R20 and one end of the inductor L10 are both connected to the drain of the MOS transistor Q12; The other end of the inductor L10 is connected to pin 15, pin 16, pin 17 of the control chip U6, and one end of the capacitor C114. The other end of the capacitor C114 is connected to pin 14 of the control chip U6.

7. The speaker charging circuit according to claim 6, characterized in that: The power module includes a power interface unit and a power control unit; The power interface unit includes resistors R29, R34, R35, R36, R37, and R39, diode D19, Schottky diode Q1, transistor Q3, MOSFET Q4, capacitors C12, C13, and C58. One end of the resistor R29 is connected to the other end of the capacitor C21; The other end of the resistor R29 is connected to the positive terminal of the diode D19; One end of the resistor R36 is used to connect to the POWER_ON of the speaker control module; The other end of resistor R36, one end of resistor R37, and the cathode of diode D19 are all connected to the base of transistor Q3. The other end of the resistor R37 and the emitter of the transistor Q3 are connected to GND respectively; The collector of the transistor Q3 is connected to one end of the resistor R35 and pin 1 of the Schottky diode Q1. Pin 2 of the Schottky diode Q1 is used to connect to the POWER_KEY of the speaker control module; Pin 3 of the Schottky diode Q1 is used to connect to the speaker control module SW; The other end of the resistor R35 is connected to the gate of the MOS transistor Q4 and one end of the resistor R34. The source of the MOSFET Q4 and the other end of the resistor R34 are both connected to pin 2 of the common-mode inductor LA1. The drain of the MOSFET Q4 is connected to one end of the resistor R38, one end of the capacitor C13, one end of the capacitor C58, and the input terminal of the power control unit. The output terminal of the power control unit is connected to the other end of the resistor R94, and the output terminal of the power control unit is used to connect to the speaker control module; The other end of the resistor R38 is connected to one end of the resistor R39 and one end of the capacitor C12, and the other end of the resistor R38 is used to connect to the BAT_DET of the speaker control module. The other ends of resistor R39, capacitor C12, capacitor C13, and capacitor C58 are all connected to GND.

8. The speaker charging circuit according to claim 7, characterized in that: The power control unit includes a power chip U1, resistors R40, R15, and R18, capacitors C17 and C59, an electrolytic capacitor EC2, an inductor L8, and a diode D2. The power chip U1 is an LP6460; Pin 5 of the power chip U1 and one end of resistor R40 are both connected to the drain of the MOS transistor Q4. Pin 4 of the power chip U1 is connected to the other end of the resistor R40; Pin 1 of the power chip U1 is connected to one end of the capacitor C17; Pin 6 of the power chip U1 is connected to the other end of the capacitor C17 and one end of the inductor L8. Pin 3 of the power chip U1 is connected to one end of resistor R15 and one end of resistor R18. Pin 2 of the power chip U1 and the other end of resistor R15 are both connected to GND. The other end of resistor R18, the other end of inductor L8, one end of capacitor C59, the positive terminal of electrolytic capacitor EC2, and the positive terminal of diode D2 are all connected to the other end of resistor R94. The other end of capacitor C59 and the negative terminal of electrolytic capacitor EC2 are both connected to GND. The negative terminal of diode D2 is used to connect to the A5V of the speaker control module.

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