CN204316114U - Lithium battery multi-output power supply circuit in a kind of mobile terminal - Google Patents

Abstract

The utility model relates to a lithium battery multi-output power supply circuit in a mobile terminal, comprising: a USB power supply port, a charging circuit, a lithium battery power supply circuit, a first boost circuit, a second boost circuit, a first step-down circuit and a second voltage boost circuit. Step-down circuit; the USB power supply circuit is connected to the lithium battery power supply circuit through the charging circuit; the input end of the first boost circuit, the input end of the second boost circuit, the first step-down circuit The input end of the voltage reducing circuit and the input end of the second step-down circuit are respectively connected with the lithium battery power supply circuit. The multi-output power supply circuit of a lithium battery in a mobile terminal proposed by the utility model provides abundant output interfaces for the added electrical equipment on the mobile terminal, and facilitates the increase of the peripheral equipment of the mobile terminal.

Description

A lithium battery multi-output power supply circuit in a mobile terminal

technical field

The utility model relates to a mobile terminal power supply circuit, in particular to a lithium battery multi-output power supply circuit in a mobile terminal.

Background technique

Traditional mobile terminals use lithium batteries for power supply, and the output voltage of conventional lithium battery power supply circuits is relatively single. If other peripheral devices are added to the mobile terminal, it is often necessary to continue to match the power supply according to the peripheral devices, causing great inconvenience. At the same time, the weight of the mobile terminal is increased; in addition, the charging of the lithium battery in the conventional mobile terminal requires a matching charger. With the increase of peripheral devices, the charging method will also cause great inconvenience.

Contents of the invention

The purpose of the utility model is to provide a lithium battery multi-output power supply circuit in a mobile terminal to overcome the defects in the prior art, and the utility model has a simple structure and is easy to realize.

In order to achieve the above purpose, the technical solution of the present invention is: a lithium battery multi-output power supply circuit in a mobile terminal, which is characterized in that it includes: a USB power supply port, a charging circuit, a lithium battery power supply circuit, a first booster circuit, a second Two step-up circuits, a first step-down circuit and a second step-down circuit; the USB power supply port is connected to the lithium battery power supply circuit through the charging circuit; the input end of the first step-up circuit, the second step-down circuit The input end of the second boost circuit, the input end of the first step-down circuit and the input end of the second step-down circuit are respectively connected to the lithium battery power supply circuit;

The first boost circuit includes: first to fifth resistors, first inductors, first to sixth capacitors, MOS transistors and chip MP3428; the BST terminal of the chip MP3428 is connected to the first resistor through the first resistor One end of a capacitor is connected; the other end of the first capacitor is connected to the source of the MOS transistor; the gate of the MOS transistor is connected to the SDR end of the chip MP3428; the SW1 to SW5 ends of the chip MP3428 are all Connected to one end of the first inductor and connected to the other end of the first capacitor; the other end of the first inductor is connected to one end of the second capacitor and used as the first boost circuit Input terminal; the other end of the second capacitor is grounded; the SENSE end of the chip MP3428 is connected to the IN end, and connected to the other end of the first inductance; the MODE end of the chip MP3428 passes through the second resistor Grounding; the VDD_5V end of the chip MP3428 is grounded through the third capacitor; the SS end of the chip MP3428 is grounded through the fourth capacitor; the COMP end of the chip MP3428 is connected to the first capacitor through the fifth capacitor One end of the three resistors, the other end of the third resistor is grounded; one end of the fourth resistor is connected to one end of the fifth resistor, and connected to the FB end of the chip MP3428; the other end of the fifth resistor One end is grounded; the other end of the fourth resistor is connected to the OUT end of the chip MP3428, and connected to the drain of the MOS transistor; the drain of the MOS transistor is connected to one end of the sixth capacitor, and As the output end of the first booster circuit; the other end of the sixth capacitor is grounded;

The second boost circuit includes: a sixth resistor, a seventh resistor, a second inductor, a seventh capacitor, an eighth capacitor, and a chip MP3422; one end of the second inductor is connected to one end of the seventh capacitor, and As the input end of the second boost circuit; the other end of the seventh capacitor is grounded; the other end of the second inductor is connected to the SW1 end and SW2 end of the chip MP3422 respectively; the IN of the chip MP3422 terminal is connected to NC2 terminal, and connected to one terminal of the second inductance; one terminal of the sixth resistor is connected to one terminal of the seventh resistor, and connected to the FB terminal of the chip MP3422; the seventh resistor The other end of the sixth resistor is grounded; the other end of the sixth resistor is respectively connected to the OUT1 end, OUT2 end, OUT3 end and one end of the eighth capacitor of the chip MP3422, and is used as the output end of the second boost circuit; The other end of the eighth capacitor is grounded.

In an embodiment of the present invention, the first step-down circuit includes: a ninth capacitor, a tenth capacitor, and a chip LC1463-18; the VCC end of the chip LC1463-18 is connected to one end of the ninth capacitor, And as the input end of the first step-down circuit; the other end of the ninth capacitor is grounded; the CE end of the chip LC1463-18 is connected to the VCC end of the chip LC1463-18; the chip LC1463 The VOUT end of -18 is connected to one end of the tenth capacitor and used as the output end of the first step-down circuit; the other end of the tenth capacitor is grounded;

The second step-down circuit includes: an eighth resistor, a ninth resistor, a third inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a chip SY8088; one end of the eleventh capacitor is connected to the The VIN end of the chip SY8088 is connected and used as the input end of the second step-down circuit; one end of the eighth resistor R4 is connected to one end of the twelfth capacitor, and connected to one end of the ninth resistor; The other end of the ninth resistor is grounded; the FB end of the chip SY8088 is connected to one end of the ninth resistor; the SW end of the chip SY8088 is connected to the other end of the eighth resistor through the third inductor ; and the other end of the eighth resistor is also connected to the other end of the twelfth capacitor, connected to one end of the thirteenth capacitor, and used as the output end of the second step-down circuit.

In an embodiment of the present invention, the charging circuit includes: the tenth to the thirteenth resistors, the fourteenth to the sixteenth capacitors, and the chip MP2602; one end of the fourteenth capacitor is connected to the IN of the chip MP2602 terminal, and as the input terminal of the charging circuit; the other end of the fourteenth capacitor is connected to the EN terminal of the chip MP2602, and grounded; one end of the tenth resistor is connected to the fourteenth capacitor. One end is connected; the other end of the tenth resistor is connected to the other end of the eleventh resistor, and connected to the NTC end of the chip MP2602; the other end of the eleventh resistor is grounded; the chip MP2602 The SS end is grounded through the fifteenth capacitor; the IBF end of the chip MP2602 is grounded through the twelfth resistor; the ISET end of the chip MP2602 is grounded through the thirteenth resistor; the BATT end of the chip MP2602 is connected to the sixteenth resistor One end of the capacitor is connected and used as the output end of the charging circuit; the other end of the sixteenth capacitor is grounded.

Compared with the prior art, the utility model has the following beneficial effects: a lithium battery multi-output power supply circuit in a mobile terminal proposed by the utility model provides abundant lithium battery output ports and solves the problem caused by the increase of peripheral equipment. The problem caused by the power supply and the inconvenient charging method.

Description of drawings

Fig. 1 is a lithium battery multi-output power supply circuit in a mobile terminal in the present invention.

Fig. 2 is a circuit diagram of the charging circuit in the utility model.

Fig. 3 is a circuit diagram of the first booster circuit in the utility model.

Fig. 4 is a circuit diagram of the second booster circuit in the present invention.

Fig. 5 is a circuit diagram of the first step-down circuit in the utility model.

Fig. 6 is a circuit diagram of the second step-down circuit in the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the technical solution of the utility model is described in detail.

The utility model provides a lithium battery multi-output power supply circuit in a mobile terminal, which is characterized in that, as shown in the figure, it includes: a USB power supply port, a charging circuit, a lithium battery power supply circuit, a first boost circuit, and a second boost circuit , a first step-down circuit and a second step-down circuit; the USB power supply port is connected to the lithium battery power supply circuit through the charging circuit; the input end of the first step-up circuit, the second step-up circuit The input end of the first step-down circuit, the input end of the first step-down circuit and the input end of the second step-down circuit are respectively connected to the lithium battery power supply circuit;

In this embodiment, as shown in FIG. 2 , the charging circuit includes: tenth to thirteenth resistors, fourteenth to sixteenth capacitors, and chip MP2602; one end of the fourteenth capacitor C1 is connected to the The IN end of the chip MP2602 is connected, and is used as the input end of the charging circuit, and the input end is connected with the USB power supply port, and the voltage of 5.0V is provided by the USB power supply end; the other end of the fourteenth capacitor C1 is connected with the chip The EN terminal of MP2602 is connected and grounded; one end of the tenth resistor R1 is connected to one end of the fourteenth capacitor C1; the other end of the tenth resistor R1 is connected to the other end of the eleventh resistor R2 , and access the NTC end of the chip MP2602; the other end of the eleventh resistor R2 is grounded; the SS end of the chip MP2602 is grounded through the fifteenth capacitor C2; the IBF end of the chip MP2602 is grounded through the twelfth Resistor R3 is grounded; the ISET end of the chip MP2602 is grounded through the thirteenth resistor R4; the BATT end of the chip MP2602 is connected to one end of the sixteenth capacitor C3, and is used as the output end of the charging circuit. The output voltage at the end matches the lithium battery power supply circuit, and in this embodiment, a single-cell high-rate discharge lithium battery is used; the other end of the sixteenth capacitor C3 is grounded.

As shown in Figure 3, the first boost circuit includes: first to fifth resistors, first inductors, first to sixth capacitors, MOS tubes and chip MP3428; the BST terminal of the chip MP3428 is A resistor R34 is connected to one end of the first capacitor C107; the other end of the first capacitor C107 is connected to the source of the MOS transistor; the gate of the MOS transistor is connected to the SDR end of the chip MP3428; The SW1 to SW5 ends of the chip MP3428 are all connected to one end of the first inductor L3, and connected to the other end of the first capacitor C107; the other end of the first inductor L3 is connected to the second capacitor C86 One end is connected and used as the input end of the first boost circuit; the other end of the second capacitor C86 is grounded; the SENSE end of the chip MP3428 is connected to the IN end, and connected to the first inductance L3 The other end of the chip MP3428; the MODE end of the chip MP3428 is grounded through the second resistor R40; the VDD_5V end of the chip MP3428 is grounded through the third capacitor C105; the SS end of the chip MP3428 is grounded through the fourth capacitor C106 Grounded; the COMP end of the chip MP3428 is connected to one end of the third resistor R36 through the fifth capacitor C110, and the other end of the third resistor R36 is grounded; one end of the fourth resistor R69 is connected to the first end of the fourth resistor R69 One end of five resistors R74 is connected and connected to the FB end of the chip MP3428; the other end of the fifth resistor R74 is grounded; the other end of the fourth resistor R69 is connected to the OUT end of the chip MP3428 and connected to into the drain of the MOS transistor; the drain of the MOS transistor is connected to one end of the sixth capacitor C100, and serves as the output end of the first boost circuit. In this embodiment, the first boost The output end of the circuit outputs a voltage of 8.0V; the other end of the sixth capacitor C100 is grounded;

As shown in Figure 4, the second boost circuit includes: a sixth resistor, a seventh resistor, a second inductor, a seventh capacitor, an eighth capacitor, and a chip MP3422; one end of the second inductor L4 and the first One end of the seven capacitors C76 is connected and used as the input end of the second boost circuit; the other end of the seventh capacitor C76 is grounded; the other end of the second inductance L4 is connected to the SW1 end and the end of the chip MP3422 respectively. The SW2 end is connected; the IN end of the chip MP3422 is connected to the NC2 end, and connected to one end of the second inductor L4; one end of the sixth resistor R66 is connected to one end of the seventh resistor R47, and connected to The FB end of the chip MP3422; the other end of the seventh resistor R47 is grounded; the other end of the sixth resistor R66 is respectively connected to the OUT1 end, OUT2 end, OUT3 end of the chip MP3422 and one end of the eighth capacitor C77 connected and used as the output terminal of the second boost circuit, in this embodiment, the second boost circuit outputs a voltage of 5.0V; the other end of the eighth capacitor C77 is grounded.

In this embodiment, as shown in FIG. 5, the first step-down circuit includes: a ninth capacitor, a tenth capacitor, and a chip LC1463-18; the VCC terminal of the chip LC1463-18 and the ninth capacitor C169 One end of the LC1463-18 is connected to the input end of the first step-down circuit; the other end of the ninth capacitor C169 is grounded; the CE end of the chip LC1463-18 is connected to the VCC end of the chip LC1463-18; The VOUT end of the chip LC1463-18 is connected to one end of the tenth capacitor C67 and used as the output end of the first step-down circuit; the other end of the tenth capacitor C67 is grounded;

As shown in Figure 6, the second step-down circuit includes: an eighth resistor, a ninth resistor, a third inductor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, and a chip SY8088; One end of the capacitor C236 is connected to the VIN end of the chip SY8088, and is used as the input end of the second step-down circuit; one end of the eighth resistor R4 is connected to one end of the twelfth capacitor C114, and connected to One end of the ninth resistor R92; the other end of the ninth resistor R92 is grounded; the FB end of the chip SY8088 is connected to one end of the ninth resistor R92; the SW end of the chip SY8088 is connected to the third The inductor L27 is connected to the other end of the eighth resistor R4; and the other end of the eighth resistor R4 is also connected to the other end of the twelfth capacitor C114, and connected to one end of the thirteenth capacitor C214 , and as the output terminal of the second step-down circuit, in this embodiment, the output voltage of the second step-down circuit is 1.2V.

The above are the preferred embodiments of the utility model, and all changes made according to the technical solution of the utility model, when the functional effect produced does not exceed the scope of the technical solution of the utility model, all belong to the protection scope of the utility model.

Claims (3)

1. a lithium battery multi-output power supply circuit in mobile terminal, is characterized in that, comprising, and: USB powers port, charging circuit, lithium battery power supply circuit, the first booster circuit, the second booster circuit, the first reduction voltage circuit and the second reduction voltage circuit; Described USB port of powering is connected with described lithium battery power supply circuit through described charging circuit; The input of described first booster circuit, the input of described second booster circuit, the input of described first reduction voltage circuit are connected with described lithium battery power supply circuit respectively with the input of described second reduction voltage circuit;

Described first booster circuit comprises: the first to the 5th resistance, the first inductance, the first to the 6th electric capacity, metal-oxide-semiconductor and chip MP3428; The BST end of described chip MP3428 is connected with described first electric capacity one end through described first resistance; The other end of described first electric capacity accesses the source electrode of described metal-oxide-semiconductor; The grid of described metal-oxide-semiconductor is held with the SDR of described chip MP3428 and is connected; SW1 to the SW5 end of described chip MP3428 is all connected with one end of described first inductance, and accesses the other end of described first electric capacity; The other end of described first inductance is connected with one end of described second electric capacity, and as the input of described first booster circuit; The other end ground connection of described second electric capacity; The SENSE end of described chip MP3428 is held with IN and is connected, and accesses the other end of described first inductance; The MODE end of described chip MP3428 is through described second grounding through resistance; The VDD_5V end of described chip MP3428 is through described 3rd capacity earth; The SS end of described chip MP3428 is through described 4th capacity earth; The COMP end of described chip MP3428 accesses one end of described 3rd resistance, the other end ground connection of described 3rd resistance through described 5th electric capacity; One end of described 4th resistance is connected with one end of described 5th resistance, and accesses the FB end of described chip MP3428; The other end ground connection of described 5th resistance; The other end of described 4th resistance is held with the OUT of described chip MP3428 and is connected, and accesses the drain electrode of described metal-oxide-semiconductor; The drain electrode of described metal-oxide-semiconductor is connected with one end of described 6th electric capacity, and as described first booster circuit output; The other end ground connection of described 6th electric capacity;

Described second booster circuit comprises: the 6th resistance, the 7th resistance, the second inductance, the 7th electric capacity, the 8th electric capacity and chip MP3422; One end of described second inductance is connected with one end of described 7th electric capacity, and as the input of described second booster circuit; The other end ground connection of described 7th electric capacity; The other end of described second inductance is held with the SW1 of described chip MP3422 respectively to hold with SW2 and is connected; The IN end of described chip MP3422 is connected with NC2 end, and accesses one end of described second inductance; One end of described 6th resistance is connected with one end of described 7th resistance, and accesses the FB end of described chip MP3422; The other end ground connection of described 7th resistance; Described 6th resistance the other end is held with the OUT1 of described chip MP3422 respectively, OUT2 holds, OUT3 holds and one end of the 8th electric capacity is connected, and as the output of described second booster circuit; The other end ground connection of described 8th electric capacity.

2. lithium battery multi-output power supply circuit in a kind of mobile terminal according to claim 1, is characterized in that: described first reduction voltage circuit comprises: the 9th electric capacity, the tenth electric capacity and chip LC1463-18; The VCC end of described chip LC1463-18 is connected with one end of described 9th electric capacity, and as the input of described first reduction voltage circuit; The other end ground connection of described 9th electric capacity; The CE termination of described chip LC1463-18 enters the VCC end of described chip LC1463-18; The VOUT end of described chip LC1463-18 is connected with described tenth electric capacity one end, and as the output of described first reduction voltage circuit; The other end ground connection of described tenth electric capacity;

Described second reduction voltage circuit comprises: the 8th resistance, the 9th resistance, the 3rd inductance, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity and chip SY8088; One end of described 11 electric capacity is held with the VIN of described chip SY8088 and is connected, and as the input of described second reduction voltage circuit; One end of described 8th resistance R4 is connected with one end of described 12 electric capacity, and accesses one end of described 9th resistance; The other end ground connection of described 9th resistance; The FB termination of described chip SY8088 enters one end of described 9th resistance; The SW end of described chip SY8088 accesses the other end of described 8th resistance through described 3rd inductance; And the other end of described 8th resistance is also connected with the other end of described 12 electric capacity, and access one end of described 13 electric capacity, and as the output of described second reduction voltage circuit.

3. lithium battery multi-output power supply circuit in a kind of mobile terminal according to claim 1, is characterized in that: described charging circuit comprises: the tenth to the 13 resistance, the 14 to the 16 electric capacity and chip MP2602; One end of described 14 electric capacity is held with the IN of described chip MP2602 and is connected, and as the input of described charging circuit; The other end of described 14 electric capacity is held with the EN of described chip MP2602 and is connected, and ground connection; One end of described tenth resistance is connected with one end of described 14 electric capacity; The other end of described tenth resistance is connected with the other end of described 11 resistance, and accesses the NTC end of described chip MP2602; The other end ground connection of described 11 resistance; The SS end of described chip MP2602 is through the 15 capacity earth; The IBF end of described chip MP2602 is through the 12 grounding through resistance; The ISET end of described chip MP2602 is through the 13 grounding through resistance; The BATT end of described chip MP2602 is connected with one end of described 16 electric capacity, and as the output of described charging circuit; The other end ground connection of described 16 electric capacity.