TWM627880U - Switching power supply system and fast charging protocol chip thereof - Google Patents

Abstract

The embodiment of the present invention provides a switching power supply system and a fast charging protocol chip thereof. The chip is used to charge a device to be charged. The first terminal of the output current and voltage level setting module is connected to the output current and voltage level setting lead. pin; the first terminal of the fast charging protocol solidification decoding and decoding control module is connected to the second terminal of the output current and voltage level setting module, the second terminal is connected to the data communication pin, and the third terminal is connected to the channel configuration pin The first terminal of the gate driver is connected to the fourth terminal of the fast charging protocol solidification decoding and decoding control module; and the first terminal of the output module is connected to the second terminal of the gate driver, and the second terminal is connected to The output pin, the third terminal is connected to the chip power supply pin, and the output switch in the output module is turned on when the device to be charged satisfies the fast charging protocol. The above technical solution reduces the area occupied by the chip and reduces the cost .

Description

Switching power supply system and its fast charging protocol chip

This creation relates to the field of integrated circuits, in particular to a switching power supply system and its fast charging protocol chip.

In recent years, as mobile devices such as smartphones, tablets, and laptops have larger screens and faster processors, the power consumption of mobile devices has become large. In order to meet the user's requirement for the standby time of the mobile device, the capacity of the power supply battery of the mobile device is constantly increasing. In order to reduce the charging time of the power supply battery of the mobile device, the charging power of the mobile device is correspondingly increased. However, due to the physical limitation of the maximum current of the Universal Serial Bus (USB), the above-mentioned mobile devices intelligently negotiate a higher voltage with the charger, for example, switch from the traditional 5V power supply to 9V, 12V Even 20V or other specific voltage values, thus forming a fast charging protocol chip.

The (Power Delivery) PD fast charging protocol is a power transmission protocol announced by the USB Implementers Forum (USB-IF). High voltage and current, and can freely change the direction of power transmission.

Within the output power of 100W, different applications require different output voltages. For example, some applications only require output voltages of 5V, 9V, some applications only require output voltages of 5V, 9V, 12V, and some applications only require 5V, 9V, 12V, 15V, 20V output voltage, therefore, in the prior art, in order to achieve different output currents and voltages, a complex microcontroller unit ( Microcontroller Unit, MCU), which leads to a large area occupied by the digital circuit in the fast charging protocol decoding and decoding control module, resulting in a large area of the fast charging protocol chip and high cost.

In view of one or more of the above problems, embodiments of the present invention provide a switching power supply system and a fast charging protocol chip thereof, by integrating the output current and voltage level settings inside the chip The module and the fast charging protocol solidification decoding and decoding control module can prevent the integration of complex microcontroller units in the traditional fast charging protocol decoding and decoding control module, reducing the traditional fast charging protocol decoding and decoding. The area occupied by the digital circuit in the control module reduces the cost, etc.

The first embodiment of the present invention provides a fast charging protocol chip for charging a device to be charged, including chip power supply pins, output current and voltage level setting pins, data communication pins, channel configuration pins, output pins pins, output current and voltage level setting module, fast charging protocol solidification decoding and decoding control module, gate driver and output module, wherein: the first terminal of the output current and voltage level setting module is connected to The output current and voltage level setting pins; the first terminal of the fast charging protocol solidification decoding and decoding control module is connected to the second terminal of the output current and voltage level setting module, and the second terminal is connected to The data communication pin, the third terminal is connected to the channel configuration pin; the first terminal of the gate driver is connected to the fourth terminal of the fast charging protocol solidification decoding and decoding control module; The first terminal of the output module is connected to the second terminal of the gate driver, the second terminal is connected to the output pin, the third terminal is connected to the chip power supply pin, and the The output switch is turned on when the device to be charged satisfies the fast charging protocol.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes an undervoltage lockout/low dropout linear voltage regulator module, wherein: the undervoltage lockout/low dropout linear voltage regulator module is connected to the power supply of the chip pin.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes an optocoupler driving pin, an output current amplifying module, an output current feedback operational amplifier module and a loop control module, wherein: the output current amplifying module The first and second terminals of the module are respectively connected to the fourth and second terminals of the output module; the first terminal of the output current feedback operational amplifier module is connected to the third terminal of the output current amplifying module terminals; and the first terminal of the loop control module is connected to the second terminal of the output current feedback operational amplifier module, and the second terminal is connected to the optocoupler driving pin.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes a first digital-to-analog converter, wherein: a first terminal of the first digital-to-analog converter is connected to the fast charging protocol solidification decoding and decoding The fifth terminal of the control module, the second terminal is connected to the third terminal of the output current feedback operational amplifier module.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes a voltage divider module and an output voltage feedback operational amplifier module, wherein: the first terminal of the voltage divider module is connected to the a chip power supply pin, the second terminal is connected to the reference ground; and the first terminal of the output voltage feedback operational amplifier module is connected to the third terminal of the voltage divider module, and the second terminal is connected to the loop control The third terminal of the module.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes a second digital-to-analog converter, wherein: the first terminal of the second digital-to-analog converter is connected to the fast charging protocol solidification decoding and decoding The sixth terminal of the control module, the second terminal is connected to the third terminal of the output voltage feedback operational amplifier module.

The fast charging protocol chip provided according to the first embodiment of the present invention further includes a protection control module, wherein: the protection control module is connected to the seventh terminal of the fast charging protocol solidification decoding and decoding control module.

According to the fast charging protocol chip provided by the first embodiment of the present invention, the output module further includes a current detection unit, wherein: the first terminal, the second terminal and the third terminal of the output switch are respectively used as the output the first terminal, the second terminal and the third terminal of the module; the first terminal, the second terminal and the third terminal of the current detection unit are respectively connected to the first terminal, the second terminal and the third terminal of the output switch terminal, and the fourth terminal is used as the fourth terminal of the output module.

According to the fast charging protocol chip provided by the first embodiment of the present invention, the current detection unit is a SenseFET.

The second embodiment of the present invention provides a switching power supply system, including the fast charging protocol chip described in the first embodiment.

According to the switching power supply system and the fast charging protocol chip provided by the embodiment of the present invention, by integrating the output current and voltage level setting module and the fast charging protocol solidification decoding and decoding control module in the chip, the traditional fast charging is reduced. The area occupied by the digital circuit in the protocol decoding and decoding control module reduces the cost, etc.

100,200,300: Switching Power Supply System

400: Fast Charge Protocol Chip

402: output module

404: Output current amplification module

406: Output Current Feedback Operational Amplifier (CC EA) Module

408: Loop Control Module

410: Voltage divider module

412: Output Voltage Feedback Operational Amplifier (CV EA) Module

414: Under-voltage lockout/low dropout linear voltage regulator module

416: Fast charging protocol solidified decoding and decoding control module

418: Gate driver

420: Digital to Analog Converter

422: Digital to Analog Converter

424: Protection control module

426: Output current and voltage level setting module

CC1: pin

CC2: pin

DAC1, DAC2: Digital to Analog Converters

DN: pin

DP: pin

GND: pin

ISP: Current detection positive terminal

ISN: Current detection negative terminal

M1: output switch

M2: senseFET

OPTO: pin

PR: pin

R1, R2, R9, R11: Resistors

sense: sense resistance

USB/TYPE C CC1: pin

USB/TYPE C CC2: pin

USB/TYPE C DN: pin

USB/TYPE C DP pin

VBUS: pin

Vbus: pin

Vin: pin

Vin_div: divider voltage

The present creation can be better understood from the following description of the specific embodiments of the present creation in conjunction with the drawings, wherein:

FIG. 1 shows a schematic circuit diagram of a switching power supply system 100 including a conventional fast-charging protocol chip in the prior art;

FIG. 2A shows a schematic circuit diagram of the switching power supply system 200 provided by the first embodiment of the present invention;

FIG. 2B shows a schematic circuit diagram of the switching power supply system 300 provided by the second embodiment of the present invention;

FIG. 3A shows a schematic diagram of the pins of the fast charging protocol chip provided by the first embodiment of the present invention;

FIG. 3B shows a schematic diagram of the pins of the fast charging protocol chip provided by the second embodiment of the present invention; and

FIG. 4 shows a schematic circuit diagram of the fast charging protocol chip 400 provided by the embodiment of the present invention.

Features and exemplary embodiments of various aspects of the present invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present creation by illustrating an example of the present creation. This creation is by no means limited to any specific configuration set forth below, but covers any modification, substitution and improvement of elements and components without departing from the spirit of this creation. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention. In addition, it should be noted that the term "A and B are connected" used herein may mean "A and B are directly connected" or "A and B are indirectly connected via one or more other elements".

As mobile devices such as smartphones, tablets, and laptops become more versatile, the capacity of the batteries that power them increases exponentially. However, limited by the physical limitation of USB maximum current, these mobile devices use a higher voltage that intelligently negotiates with the charger, for example, from the traditional 5V power supply, switching to such as 9V, 12V or even 20V or other specific voltage values for power supply, In this case, the application of fast charging using the PD fast charging protocol has appeared.

It is understandable that the PD fast charging protocol is a power transfer protocol announced by the USB-IF organization. Its publication increases the default 5V/2A output capability of the charger to such as 100W, which can achieve higher voltage and current, and The direction of power delivery can be freely changed. However, since the output voltage is no longer the traditional 5V output, in order to ensure the safety and reliability of plugging into the device to be charged, the embodiment provided by this creation adds an output switch on the output Vbus, and the output switch can be connected between the output line and the waiting device. The charging device is enabled when it meets the protocol requirements, so that the device to be charged can be provided with appropriate voltage and current.

At present, in the scenario where the output power is within 100W, reduce the power consumption of system components Quantity to achieve high integration of protocol chips, which has become one of the key technical problems that need to be solved in the prior art. The embodiment provided by this creation is implemented by building an output module, a current amplifier circuit, and a loop control module into the fast charging protocol chip. One or more of the groups, so that the miniaturization, low cost, and high efficiency of the PD fast charging source can be realized.

In order to better understand the switching power supply system and its fast charging protocol chip provided by this creation, the following first introduces the switching power supply system in the prior art, in which the flyback switching power supply system is taken as an example for introduction.

Specifically, referring to FIG. 1 , FIG. 1 shows a schematic circuit diagram of a switching power supply system 100 including a conventional fast-charging protocol chip in the prior art.

As shown in FIG. 1 , the switching power supply system 100 mainly includes an Electro-Magnetic Interference (EMI) filter, a Pulse Width Modulation (PWM) module, a fast charging protocol chip, and a synchronous rectifier. SR) modules, etc.

Among them, the number of pins of the fast charging protocol chip is large, the area occupied by the chip is large, and the output switch M1 and the detection resistor (marked as sense) are located outside the chip, resulting in low integration of the chip, high cost and size large, and it is difficult to achieve miniaturization.

In addition, a complex microcontroller unit (Microcontroller Unit, MCU) is integrated in the fast-charging protocol chip, resulting in a large area of the chip and a high cost.

In order to solve one or more of the above problems in the prior art, embodiments of the present invention provide a highly integrated fast charging protocol chip and a switching power supply system including the chip.

Specifically, referring to FIG. 2A and FIG. 2B , FIG. 2A shows a schematic circuit diagram of the switching power supply system 200 provided by the first embodiment of the present invention, and FIG. 2B shows the switching power supply system provided by the second embodiment of the present invention. 300 is a schematic diagram of the circuit, wherein the flyback switching power supply system is used as an example for introduction, and it should be understood that these diagrams are only for the purpose of illustration and should not be construed as limiting.

The difference between FIG. 2A and FIG. 2B is that the driving mode of the optocoupler driving pin OPTO of the chip (which will be described below) is different. The driving mode in FIG. 2A is up driving, while the driving mode in FIG. 2B is down driving .

The pins of the fast charging protocol chip provided in FIGS. 2A and 2B are introduced below with reference to FIG. 3 . Specifically, FIG. 3A shows a schematic diagram of the pins of the fast charging protocol chip provided by the first embodiment of the present invention, and FIG. 3B shows the pin diagram of the fast charging protocol chip provided by the second embodiment of the present invention. It is intended that the package form can be ESOP8 or SOP8, etc., so as to minimize the cost of the fast charging protocol chip connected to the Universal Serial Bus Type-C (USB Type-C) module.

As shown in FIG. 3A , the number of pins of the fast charging protocol chip provided by the embodiment of the present invention may be 9. For example, the fast charging protocol chip may include pins such as: output current and voltage level setting PR pin, output Vbus pin, chip power supply Vin pin, optocoupler drive OPTO pin, chip ground GND pin, channel configuration pin (USB/TYPE C CC2 pin, USB/TYPE C CC1 pin), data communication pin ( USB/TYPE C DN pin and USB/TYPE C DP pin), etc. In addition, as shown in FIG. 3B , in order to further reduce the packaging cost, the number of pins of the fast charging protocol chip provided by the embodiment of the present invention may be 8. For example, the package pins may be further simplified into the SOP8 form shown in FIG. 3B , the fast charging protocol chip can include pins such as: output Vbus pin, chip power supply Vin pin, optocoupler driver OPTO pin, chip ground GND pin, channel configuration pin (USB/TYPE C CC2 pin, USB /TYPE C CC1 pin), data communication pins (USB/TYPE C DN pin and USB/TYPE C DP pin), etc. Among them, the PR pin sets the functions of different power levels, and is adjusted within the chip ( Trimming) method, the protocol chip will appear in different versions such as A for /C..., Fig. 3B is compared with Fig. 3A, the purpose of the two is the same, but the implementation is different. The following content will be described in detail by taking Fig. 3A as an example.

As an example, by setting the size of the resistance connected to the PR pin of the fast charging protocol chip, different output currents and output current levels can be implemented at the VBUS pin of the fast charging protocol chip, thereby achieving different power levels.

Referring to FIGS. 2A and 2B again, the connection relationship of the above-mentioned pins of the chip in the switching power supply system is as follows: the PR pin of the chip can be grounded via a resistor (for example, R11 in FIG. 2A , R9 in FIG. 2B ), and can be Set the size of the resistor connected to the PR pin to achieve different output current and output voltage levels at the VBUS pin of the chip, so that different output power levels can be achieved; the Vbus pin of the chip can be connected to USB/TYPE-C The VBUS terminal of the interface can be used to receive the VBUS signal; the Vin pin of the chip can be connected to the positive terminal of the output capacitor, which can be used to detect the output voltage in addition to supplying power to the chip, so as to realize the control of the system. Control of different output voltages; the OPTO pin of the chip can be connected to the optocoupler of the switching power supply system, which can be used to control the current flowing through the optocoupler to achieve system loop control; the GND pin of the chip can be connected to the output The negative terminal of the capacitor can also be connected to the GND terminal of the USB/TYPE-C interface; the USB/TYPE C of the chip The CC2 pin can be connected to the CC2 terminal of the USB/TYPE-C interface and can be used to receive CC2 signals; the USB/TYPE C CC1 pin of the chip can be connected to the CC1 terminal of the USB/TYPE-C interface and can be used to receive CC1 Signal; the USB/TYPE C DN pin of the chip can be connected to the DN terminal of the USB/TYPE-C interface and can be used to receive DN signals; and the USB/TYPE C DP pin of the chip can be connected to the USB/TYPE-C interface The DP side can be used to receive DP signals.

To sum up, the fast charging protocol chip provided by the embodiments of this creation can integrate output current detection resistors and pins, output switches and driving pins, output voltage/current loop compensation pins and PR pins, etc. Therefore, with Compared with the traditional switching power supply system in FIG. 1 , the switching power supply system provided in FIG. 2A and FIG. 2B has fewer components and lower cost.

The fast charging protocol chip provided by the embodiment of the present invention will be introduced below by way of a specific example. Specifically, referring to FIG. 4 , FIG. 4 shows a schematic circuit diagram of the fast charging protocol chip 400 provided by the embodiment of the present invention.

As an example, the fast charging protocol chip 400 may include Vin pins, PR pins, data communication pins (eg, DP pins and DN pins), channel configuration pins (eg, CC1 pins and CC2 pins) ), Vbus pin, output current and voltage level setting module 426, fast charging protocol solidification decoding and decoding control module 416, gate driver 418, output module 402, etc.

Specifically, the first terminal of the output current and voltage level setting module 426 can be connected to the PR pin, and the first terminal of the fast charging protocol solidification decoding and decoding control module 416 can be connected to the output current and voltage level setting module The second terminal of 426, the second terminal of the fast charging protocol solidification decoding and decoding control module 416 can be connected to the data communication pins (eg, DP pin and DN pin), and the fast charging protocol solidification decoding and decoding control The third terminal of the module 416 can be connected to the channel configuration pins (eg, CC1 pin and CC2 pin), and the first terminal of the gate driver 418 can be connected to the fast charging protocol solidification decoding and decoding control module 416. The fourth terminal, and the first terminal of the output module 402 (including the output switch and the senseFET) can be connected to the second terminal of the gate driver 418, the second terminal of the output module 402 can be connected to the Vbus pin, the output module The third terminal of 402 can be connected to the Vin pin, and the output switch M1 in the output module 402 can be turned on when the device to be charged satisfies the fast charging protocol.

As an example, the output current and voltage level setting module 426 can be set at the Vbus pin according to different resistance values to ground (eg, the size of the resistance connected to the PR pin) Different output voltages, eg, 5V, 9V; 5V, 9V, 12V; 5V, 9V, 12V, 15V; 5V, 9V, 12V, 15V, 20V, etc., for example, can be current and output the corresponding voltage to the fast charging protocol solidified decoding and decoding control module 416, so that the fast charging protocol solidified decoding and decoding control module 416 can set the corresponding output current at the Vbus pin based on the corresponding voltage and output voltage levels.

As an example, the fast charging protocol solidified decoding and decoding control module 416 can be used to implement the communication between the switching power supply system and the device to be charged, and to set the output current and voltage level based on commands from the device to be charged Different voltage output, current output and protection control functions within the power setting range of the module.

As an example, the gate driver 418 can control the conduction of M1 and M2 based on the signal from the fast charging protocol solidified decoding and decoding control module 416. It can be understood that M1 and M2 have a common gate structure, and both of them simultaneously Turning on and off, specifically, the output terminal of the gate driver 418 may be connected to the gates of M1 and M2 to be turned on and off based on the signal from the fast charging protocol solidified decoding and decoding control module 416 .

Through the above solutions provided by the embodiments of the present invention, by integrating the output current and voltage level setting module 426 and the fast charging protocol solidification decoding and decoding control module 416 inside the chip, the output current and voltage level setting module 426 can be Based on the magnitude of the current on the resistor connected to the PR pin, a voltage related to the current on the resistor connected to the PR pin is provided to the fast charge protocol solidified decoding and decoding control module 416, and the fast charge protocol solidified and decoded The code and decoding control module 416 can set the corresponding output current and voltage level at the Vbus pin based on the voltage, so as to achieve different output current and voltage levels within the range of the corresponding output current and voltage level based on the command from the device to be charged. Voltage output, current output, etc., which can prevent the integration of complex microcontroller units in the traditional fast charging protocol decoding and decoding control module, reducing the digital circuit in the traditional fast charging protocol decoding and decoding control module The area occupied, thereby reducing the wafer area and cost.

As an example, the fast charging protocol chip may further include an undervoltage lockout/low dropout linear voltage regulator module 414. Specifically, the undervoltage lockout/low dropout linear voltage regulator module 414 may be connected to the Vin pin, and can use For powering one or more components in the chip, the undervoltage lockout/low dropout linear regulator module 414 can be an undervoltage lockout (UVLO) module and a low dropout linear regulator (Low Dropout Regulator) , LDO), which can be used to detect the output power voltage, and provide output voltage information for internal control.

As an example, as shown in FIG. 4 , the fast charging protocol chip 400 may further include OPTP pins, an output current amplification module 404 , an output current feedback operational amplifier (CC EA) module 406 , a loop control module 408 , and the like .

Specifically, the first and second terminals of the output current amplifying module 404 can be connected to the fourth terminal and the second terminal of the output module 402, respectively, and the first terminal of the output current returning operational amplifier module 406 can be connected to the output The third terminal of the current amplification module 404, and the first terminal of the loop control module 408 can be connected to the second terminal of the output current feedback operational amplifier module 406, and the second terminal of the loop control module 408 can be connected to OPTP pin.

As an example, the output current amplifying module 404 can be used to amplify the output current.

As an example, the output current feedback operational amplifier (CC EA) module 406 may be used to output a signal to the loop control module 408 based on the amplified output current from the output current amplification module 404, in particular, the output current feedback operation Amplifier module 406 may be used to amplify the difference between the amplified output current from output current amplification module 404 and the current reference from digital-to-analog converter 420 (eg, DAC1 ), which may be used to achieve different , the specific details of which will be described in detail below.

As an example, the loop control module 408 can be used to compensate the output current feedback loop and the output voltage feedback loop to ensure stability under various conditions.

Through the above solutions provided by the embodiments of the present invention, by integrating the output current amplification module 404, the output current feedback operational amplifier module 406, and the loop control module 408, etc. inside the chip, the number of pins of the fast charging protocol chip can be reduced and the number of peripheral devices, so that the system integration can be improved, the system components can be saved, the cost can be reduced, and the miniaturized design of the system can be realized.

As an example, the fast-charging protocol chip 400 may further include a digital-to-analog converter 420 (eg, DAC1 ). Specifically, the first terminal of the digital-to-analog converter 420 may be connected to the fast-charging protocol solidification decoding and decoding control module. The fifth terminal of group 416 , the second terminal of digital-to-analog converter 420 may be connected to the third terminal of output current feedback operational amplifier module 406 .

As an example, the digital-to-analog converter 420 may be used to generate a current reference based on the signal from the fast charging protocol solidified decoding and decoding control module 416 for implementing different electrical flow control, in particular, the current reference is input to the output current feedback op-amp module 406 so that the output current feedback op-amp module 406 can be used for the current reference and the amplified output current from the output current amplification module 404 The difference between them is amplified to achieve different output currents.

As one example, the output signal from the output current feedback operational amplifier module 406 can be input to the loop control module 408 so that the loop control module 408 can be used to compensate the output current feedback loop.

As an example, the fast charging protocol chip 400 may further include a voltage divider module 410 and an output voltage feedback operational amplifier (CV EA) module 412 and the like.

Specifically, the first terminal of the voltage divider module 410 can be connected to the Vin pin, the second terminal of the voltage divider module 410 can be connected to the reference ground, and the first terminal of the output voltage feedback operational amplifier module 412 can be connected to the divider The third terminal of the pressure module 410 and the second terminal of the output voltage feedback operational amplifier module 412 can be connected to the third terminal of the loop control module 408 .

In addition, the voltage dividing module 410 can be used to divide the input voltage Vin pin with two voltage dividing resistors (for example, R1 and R2 ), and then input the divided voltage (for example, Vin_div) to, for example, the output voltage The operational amplifier module 412 is fed back so that the output voltage is fed back to the operational amplifier module 412 to amplify the difference between the voltage reference and the divided voltage from the digital-to-analog converter 422 to achieve different output voltages.

As an example, the voltage dividing module 410 may include a resistor R1 and a resistor R2 connected in series between the Vin pin and the reference ground, wherein the terminal of the resistor R1 far from the resistor R2 may be used as the first terminal of the voltage dividing module 410 The terminal of the resistor R2 away from the resistor R1 can be used as the second terminal of the voltage divider module 410, and the common terminal of the resistor R1 and the resistor R2 can be used as the third terminal of the voltage divider module 410, that is, the divided voltage can be output. vin_div is fed back to the output voltage operational amplifier module 412 .

As an example, the output voltage feedback operational amplifier module 412 can be used to output a signal to the loop control module 408 based on the divided voltage from the voltage dividing module 410. Specifically, the output voltage feedback operational amplifier module 412 can be used with Different output voltages can be achieved by amplifying the difference between the divided voltage from the voltage dividing module 410 and the voltage reference from the digital-to-analog converter 422, the details of which will be described in detail below.

As an example, in addition to compensating the output current feedback loop, the above-mentioned loop control module 408 can also be used to compensate the output voltage feedback loop to ensure that under various conditions lower stability.

As an example, the fast charging protocol chip 400 may further include a digital-to-analog converter 422 (eg, DAC2), and specifically, the first terminal of the digital-to-analog converter 422 may be connected to the fast charging protocol curing decoding and decoding control module The sixth terminal of 416 , the second terminal of the digital-to-analog converter 422 may be connected to the third terminal of the output voltage feedback operational amplifier module 412 .

As an example, the digital-to-analog converter 422 can be used to generate a voltage reference based on the signal from the fast charging protocol solidified decoding and decoding control module 416 for implementing different voltage controls, specifically, the voltage reference The input to output voltage is fed back to the operational amplifier module 412 so that the output voltage is fed back to the operational amplifier module 412 to achieve different output voltages based on the voltage reference and the divided voltage from the voltage divider module 410 .

As an example, the fast charging protocol chip 400 may include a protection control module 424 . Specifically, the protection control module 424 may be connected to the seventh terminal of the fast charging protocol solidification decoding and decoding control module 416 .

As an example, the protection control module 424 can be used to protect the chip when an abnormal failure occurs, so as to implement a protection function and prevent the chip from being damaged.

As an example, the first, second, and third terminals of the output switch M1 may be used as the first, second, and third terminals of the output module 402, which may include the output switch M1, respectively. and a current detection unit (eg, a power switch senseFET), wherein the senseFET may include a sense switch M2 and a resistor R1, which may be used to detect the output current, wherein the first terminal of the current detection unit (eg, the gate of M2 pole) may be connected to the first terminal of the output switch M1 (eg, the gate of M1), and the second terminal of the current detection unit (eg, the terminal of the resistor R1 away from M2) may be connected to the second terminal of the output switch M1 ( That is, connected to the Vin pin), the third terminal of the current detection unit may be connected to the third terminal of the output switch M1, and the fourth terminal of the current detection unit (eg, the common terminal of the resistors R1 and M2) may be used as an output The fourth terminal of the module 402 .

Specifically, when a device to be charged that satisfies the USB/TYPE-C protocol is connected to the back end, the fast charging protocol chip can control the output switch M1 to be turned on to provide a suitable voltage for the device to be charged. At the same time, the power switch senseFET can be used to achieve Detect the output current to provide the appropriate current for the device to be charged.

In addition, an embodiment of the present invention also provides a switching power supply system, including the above-mentioned fast charging protocol chip.

It can be seen that the fast charging protocol chip provided by the embodiment of this creation can minimize the number of components around the chip through the built-in output switch, output current amplification module, and loop control module, and can use the PR pin to Set different output current and output voltage levels to set different power levels, so that it can be packaged in conventional SOP8, ESOP8, etc., which reduces the number of pins and the area occupied by the chip, so that fast Low-cost and miniaturized design of a charging protocol chip and a switching power supply system including this chip, which conforms to the latest PD3.0/3.1 protocol standard.

To sum up, the fast charging protocol chip provided by the embodiments of the present invention can integrate an output module (eg, an output switch), an output current amplifying module, and a loop control module (eg, current loop compensation, voltage Loop compensation), etc., can minimize the number of pins and peripheral devices of the fast charging protocol chip, so that the chip can be packaged in SOP8, which can improve system integration, save system components, reduce costs, and is conducive to the realization of The miniaturization of the system can realize the low-cost and miniaturized solution of the PD protocol charging system, which conforms to the latest PD3.0/3.1 protocol standard.

This creation can be realized in other specific forms without departing from its spirit and essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and within the meaning and range of equivalents of the claims. All changes are included in the scope of this creation.

400: Fast Charge Protocol Chip

402: output module

404: Output current amplification module

406: Output Current Feedback Operational Amplifier (CC EA) Module

408: Loop Control Module

410: Voltage divider module

412: Output Voltage Feedback Operational Amplifier (CV EA) Module

414: Under-voltage lockout/low dropout linear voltage regulator module

416: Fast charging protocol solidified decoding and decoding control module

418: Gate driver

420: Digital to Analog Converter

422: Digital to Analog Converter

424: Protection control module

426: Output current and voltage level setting module

CC1: pin

CC2: pin

DAC1, DAC2: Digital to Analog Converters

DN: pin

DP: pin

GND: pin

ISP: Current detection positive terminal

ISN: Current detection negative terminal

M1: output switch

M2: SenseFET

OPTO: pin

PR: pin

R1, R2: Resistors

Vbus: pin

Vin: pin

Vin_div: divider voltage

Claims (10)

A fast charging protocol chip for charging equipment to be charged, characterized in that it includes chip power supply pins, output current and voltage level setting pins, data communication pins, channel configuration pins, output pins, and output current pins. And voltage level setting module, fast charging protocol solidification decoding and decoding control module, gate driver and output module, among which: The first terminal of the output current and voltage level setting module is connected to the output current and voltage level setting pin; The first terminal of the fast charging protocol solidification decoding and decoding control module is connected to the second terminal of the output current and voltage level setting module, the second terminal is connected to the data communication pin, and the third terminal is connected to to the channel configuration pins; The first terminal of the gate driver is connected to the fourth terminal of the fast charging protocol solidification decoding and decoding control module; and The first terminal of the output module is connected to the second terminal of the gate driver, the second terminal is connected to the output pin, and the third terminal is connected to the chip power supply pin. The output switch of the device to be charged is turned on when the device to be charged satisfies the fast charging protocol. The fast charging protocol chip according to claim 1, further comprising an undervoltage lockout/low dropout linear voltage regulator module, wherein: The undervoltage lockout/low dropout linear voltage regulator module is connected to the chip power supply pin. The fast charging protocol chip according to claim 1, further comprising an optocoupler drive pin, an output current amplifying module, an output current feedback operational amplifier module and a loop control module, wherein: The first and second terminals of the output current amplifying module are respectively connected to the fourth and second terminals of the output module; The first terminal of the output current feedback operational amplifier module is connected to the third terminal of the output current amplification module; and The first terminal of the loop control module is connected to the second terminal of the output current feedback operational amplifier module, and the second terminal is connected to the optocoupler driving pin. The fast charging protocol chip according to claim 3, further comprising a first digital-to-analog converter, wherein: The first terminal of the first digital-to-analog converter is connected to the fifth terminal of the fast charging protocol solidification decoding and decoding control module, and the second terminal is connected to the third terminal of the output current feedback operational amplifier module . The fast charging protocol chip according to claim 3, further comprising a voltage divider module and an output voltage feedback operational amplifier module, wherein: The first terminal of the voltage dividing module is connected to the chip power supply pin, and the second terminal is connected to the reference ground; and The first terminal of the output voltage feedback operational amplifier module is connected to the third terminal of the voltage dividing module, and the second terminal is connected to the third terminal of the loop control module. The fast charging protocol chip according to claim 5, further comprising a second digital-to-analog converter, wherein: The first terminal of the second digital-to-analog converter is connected to the sixth terminal of the fast charging protocol solidification decoding and decoding control module, and the second terminal is connected to the third terminal of the output voltage feedback operational amplifier module . The fast charging protocol chip according to claim 1, further comprising a protection control module, wherein: The protection control module is connected to the seventh terminal of the fast charging protocol solidification decoding and decoding control module. The fast charging protocol chip according to claim 1, wherein the output module further comprises a current detection unit, wherein: The first terminal, the second terminal and the third terminal of the output switch are respectively used as the first terminal, the second terminal and the third terminal of the output module; The first, second and third terminals of the current detection unit are connected to the first, second and third terminals of the output switch, respectively, and the fourth terminal serves as the first terminal of the output module. Four terminals. The fast charging protocol chip according to claim 8, wherein the current detection unit is a SenseFET. A switching power supply system, characterized in that it includes the fast charging protocol chip according to any one of claim 1 to claim 9.

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