Circuit for displaying PD charging power

Abstract

The utility model relates to the technical field of PD charging, in particular to a circuit for displaying PD charging power, which comprises a PD charging circuit and a detection display circuit used for detecting and displaying the PD charging power of the PD charging circuit, and the detection display circuit comprises an MCU (Microprogrammed Control Unit) processing chip, a sampling resistor and a digital display, and the sampling resistor and the digital display are respectively and electrically connected with the MCU processing chip. Wherein the MCU processing chip calculates the charging current flowing through the sampling resistor by detecting the voltage at the two ends of the sampling resistor. In addition, the MCU processing chip detects the VBUS voltage fast charged by the PD, and then the charging power is calculated according to the formula VBUS voltage X charging current. And finally, the MCU processing chip drives a digital display to display the charging power, so as to achieve the purpose of detecting and displaying the PD charging power of PD fast charging in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of PD fast charging, and in particular to a circuit for displaying PD charging power. Background Art

[0002] PD fast charging, the full name of which is USB-PD (USB Power Delivery), is a fast charging protocol for USB connections that aims to provide higher power charging capabilities and smarter charging management for electronic devices that support the PD protocol. With the popularity of the USB Type-C interface, the PD fast charging protocol has now become the standard fast charging protocol for portable electronic devices. Through intelligent power management, PD fast charging technology allows for fine power negotiation between electronic devices and chargers to provide the charging voltage and current that best suits the electronic devices. In short, PD fast charging is an efficient, flexible and widely compatible charging technology that meets the needs of modern electronic devices for fast charging and high power through continuous technological updates and optimizations. However, electronic devices that currently use PD fast charging technology generally do not have the function of detecting and displaying the charging power allocated to electronic devices by PD fast charging, which is not conducive to users viewing the charging power during PD fast charging in real time. Utility Model Content

[0003] In view of this, the utility model proposes a circuit for displaying PD charging power, aiming to solve the problem that electronic devices currently using PD fast charging technology do not have the function of real-time detection and display of PD fast charging power.

[0004] The utility model proposes a circuit for displaying PD charging power, comprising a PD charging circuit and a detection and display circuit for detecting and displaying the PD charging power of the PD charging circuit, wherein the detection and display circuit comprises an MCU processing chip, a sampling resistor and a digital display, wherein the sampling resistor and the digital display are electrically connected to the MCU processing chip respectively, and the MCU processing chip is also electrically connected to the PD charging circuit.

[0005] Furthermore, the MCU processing chip is a CH528 chip, the sampling resistor is a surface-mount alloy resistor, and the digital display is a 188 digital tube.

[0006] Furthermore, the detection and display circuit also includes capacitor C16, capacitor C19, capacitor C53, resistor R29, resistor R39, resistor R46, resistor R12 and resistor R30; the sampling resistor is an alloy resistor R50;

[0007] Among them, the 0th pin and the 6th pin of the CH528 chip are both grounded, the 1st pin, the 4th pin, the 5th pin, the 11th pin, the 16th pin, the 17th pin, the 18th pin and the 20th pin of the CH528 chip are all suspended, the 2nd pin of the CH528 chip is respectively connected to the VBUS_M power supply terminal and one end of the capacitor C16, the other end of the capacitor C16 is grounded, the 3rd pin, the 8th pin, the 9th pin, the 10th pin, the 12th pin and the 13th pin of the CH528 chip are all connected to the digital display, the 7th pin of the CH528 chip is respectively connected to the VDD power supply terminal and one end of the capacitor C19, the other end of the capacitor C19 is grounded, and the CH52 The 14th pin of the CH528 chip is respectively connected to one end of the capacitor C53, one end of the resistor R29 and one end of the resistor R39, the other end of the resistor R29 is connected to the VDD power supply terminal, the other end of the capacitor C53 is grounded, the other end of the resistor R39 is respectively connected to the ADC-GND power supply terminal and one end of the alloy resistor R50, the 15th pin of the CH528 chip is connected to one end of the resistor R46, the other end of the resistor R46 is respectively connected to the other end of the alloy resistor R50 and the ground end, the 19th pin of the CH528 chip is respectively connected to one end of the resistor R30 and one end of the resistor R12, the other end of the resistor R30 is grounded, and the other end of the resistor R12 is connected to the VBUS_M power supply terminal.

[0008] Furthermore, the 3rd pin, the 8th pin, the 9th pin, the 10th pin, the 12th pin and the 13th pin of the CH528 chip are all connected to the digital display through a resistor, and the resistor is 750 ohms.

[0009] Furthermore, the PD charging circuit includes a PD protocol control chip, the PD protocol control chip is electrically connected to the MCU processing chip, and the PD protocol control chip is an LDR6020 chip.

[0010] Further, the PD charging circuit also includes capacitor C9, capacitor C3, resistor R4, resistor R10, resistor R14, capacitor C57, capacitor C56, capacitor C60, capacitor C58, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C61, capacitor C62, capacitor C65, capacitor C66 and resistor R19;

[0011] Among them, the 28th pin of the LDR6020 chip is respectively connected to one end of the capacitor C9, one end of the capacitor C3 and one end of the resistor R4, the other end of the capacitor C9 and the other end of the capacitor C3 are grounded, the other end of the resistor R4 is connected to the 5V power supply terminal, the 27th pin, the 29th pin and the 33rd pin of the LDR6020 chip are all grounded, the 21st pin of the LDR6020 chip is respectively connected to one end of the resistor R10 and one end of the capacitor C57, the other end of the resistor R10 is connected to the CONN-A_CC2 signal terminal, the other end of the capacitor C57 is grounded, and the 20th pin of the LDR6020 chip is respectively connected to one end of the resistor R14 and the capacitor C56. The other end of the resistor R14 is connected to the CONN-A_CC1 signal end, the other end of the capacitor C56 is grounded, the 9th pin of the LDR6020 chip is connected to the CONN-B_SBU_P signal end through the capacitor C60, the 10th pin of the LDR6020 chip is connected to the CONN-B_SBU_N signal end through the capacitor C58, the 11th pin of the LDR6020 chip is connected to the BB_D_P signal end through the resistor R15, the 12th pin of the LDR6020 chip is connected to the BB_D_N signal end through the resistor R16, the 7th pin of the LDR6020 chip is respectively connected to one end of the resistor R17 and one end of the capacitor C61, and the The other end of the resistor R17 is connected to the CONN-B_CC1 signal end, the other end of the capacitor C61 is grounded, the 8th pin of the LDR6020 chip is respectively connected to one end of the resistor R18 and one end of the capacitor C62, the other end of the resistor R18 is connected to the CONN-B_CC2 signal end, the other end of the capacitor C62 is grounded, the 22nd pin of the LDR6020 chip is respectively connected to one end of the capacitor C66 and the B_USB-C_VBUS_DET signal end, the other end of the capacitor C66 is grounded, the 23rd pin of the LDR6020 chip is respectively connected to one end of the capacitor C65 and the A_USB-C_VBUS_DET signal end, the capacitor C6 5 is grounded, pin 6, pin 13, pin 15, pin 16, pin 17, pin 19, pin 24, pin 25, pin 26, pin 32, pin 2, pin 18, pin 1, pin 5, pin 3 and pin 4 of the LDR6020 chip are all suspended, pin 14 of the LDR6020 chip is respectively connected to the SEL-UP signal terminal and one end of the resistor R19, the other end of the resistor R19 is connected to the LDO3.3V power supply terminal, pin 30 of the LDR6020 chip is connected to the B_VBUS_EN signal terminal, and pin 31 of the LDR6020 chip is connected to the A_VBUS_EN signal terminal.

[0012] Furthermore, the PD charging circuit also includes a voltage switching circuit for switching uplink power supply and downlink power supply, and the voltage switching circuit is electrically connected to the PD protocol control chip.

[0013] Furthermore, the circuit also includes a power supply circuit for providing a 5V voltage, and the power supply circuit is electrically connected to the MCU processing chip.

[0014] Furthermore, the circuit is arranged in a fast charging device supporting the PD protocol, and the digital display is located on the outer surface of the fast charging device.

[0015] Furthermore, the fast charging device includes a charger, a docking station and a fast charging cable.

[0016] Compared with the prior art, the beneficial effect of the utility model is: a circuit for displaying PD charging power, including a PD charging circuit and a detection and display circuit for detecting and displaying the PD charging power of the PD charging circuit, the detection and display circuit including an MCU processing chip, a sampling resistor and a digital display, the sampling resistor and the digital display are electrically connected to the MCU processing chip respectively, and the MCU processing chip is also electrically connected to the PD charging circuit. Among them, the MCU processing chip calculates the charging current flowing through the sampling resistor by detecting the voltage across the sampling resistor. In addition, the MCU processing chip detects the VBUS voltage of the PD fast charge, and then calculates the charging power according to the formula VBUS voltage x charging current. Finally, the MCU processing chip drives the digital display to display the charging power, so as to achieve the purpose of real-time detection and display of the PD charging power of the PD fast charge. It can be seen that the circuit structure for displaying the PD charging power is simple, the feasibility is strong, and it meets the demand for real-time monitoring of the PD charging power of the PD fast charge, which is convenient for users to view in real time, and further improves the safety and reliability of the PD fast charge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 A structural block diagram of a circuit for displaying PD charging power provided by an embodiment of the utility model;

[0019] Figure 2 A circuit schematic diagram of a detection and display circuit provided in an embodiment of the utility model;

[0020] Figure 3A circuit schematic diagram of a PD charging circuit provided in an embodiment of the utility model;

[0021] Figure 4 A circuit schematic diagram of a voltage switching circuit provided by an embodiment of the utility model;

[0022] Figure 5 A circuit schematic diagram of a power supply circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0026] Please refer to Figure 1 , which is a structural block diagram of a circuit for displaying PD charging power provided by an embodiment of the utility model.

[0027] The utility model proposes a circuit for displaying PD charging power, comprising a PD charging circuit and a detection and display circuit for detecting and displaying the PD charging power of the PD charging circuit, wherein the detection and display circuit comprises an MCU processing chip, a sampling resistor and a digital display, wherein the sampling resistor and the digital display are electrically connected to the MCU processing chip respectively, and the MCU processing chip is also electrically connected to the PD charging circuit.

[0028] Specifically, PD is a charging protocol developed by the USB Implementers Forum (USB-IF) that supports powering electronic devices of various sizes, including high-power devices such as mobile phones, tablets, and even laptops. The communication of the PD protocol is carried out through the CC pin in the charging cable and the charging head. In order to achieve PD fast charging, not only does the charger need to support the PD protocol in order to provide appropriate power and communicate, but the electronic devices connected to the charge also need to support the PD protocol in order to correctly receive and utilize the power. If one of the parties does not support the PD protocol, the advantages of PD fast charging cannot be brought into play.

[0029] Compared with the prior art, the circuit for displaying PD charging power proposed in this embodiment, during the process of PD fast charging, the MCU processing chip calculates the charging current flowing through the sampling resistor by detecting the voltage across the sampling resistor. In addition, the MCU processing chip detects the VBUS voltage of PD fast charging, and then calculates the charging power according to the formula VBUS voltage X charging current. Finally, the MCU processing chip drives the digital display to display the charging power, so as to achieve the purpose of real-time detection and display of the PD charging power of PD fast charging. It can be seen that the circuit structure for displaying PD charging power is simple, highly feasible, and meets the needs of real-time monitoring of the PD charging power of PD fast charging, which is convenient for users to view in real time, and further improves the safety and reliability of PD fast charging.

[0030] In some embodiments of the present application, the MCU processing chip is a CH528 chip, the sampling resistor is a surface-mount alloy resistor, and the digital display is a 188 digital tube.

[0031] Specifically, the CH528 chip has two functions, namely: 1. Detection function: By detecting the voltage across the sampling resistor (R50), the charging current I flowing through R50 is calculated. Pin 19 of the CH528 chip detects the VBUS voltage. The software of the CH528 chip calculates VBUS*I(R50) according to the formula P=U*I to obtain the PD charging power. 2. Display function: Pins 8, 9, 10, 12 and 13 of the CH528 chip are the driving pins of the 188 digital tube. After the CH528 chip calculates the PD charging power, it drives the 188 digital tube to display it through these pins.

[0032] Specifically, the CH528 chip is an 8-bit RISC (Reduced Instruction Set Computer) microcontroller with built-in high-voltage power management PM (Power Management). It supports multiple constant voltage or current limiting, supports direct optocoupler control of AC / DC (Alternating Current / Direct Current) power adapters, supports power management of multiple protocols such as USB PD, and provides ADC (Analog-to-Digital Converter), 5 independent DACs (Digital-to-Analog Converters), PWM (Pulse Width Modulation) timers / counters and other common functional modules.

[0033] Specifically, the chip alloy resistor is also called the current detection resistor. It is a small resistance chip sampling resistor that is connected in series in the circuit to convert the current into a voltage signal for measurement. As a current carrier, the chip alloy resistor has significantly higher resistance accuracy, temperature stability, thermal conductivity and product safety stability than ordinary ceramic resistors.

[0034] Specifically, the 188 digital tube is a common seven-segment digital tube, which is composed of multiple seven-segment digital tubes. Each seven-segment digital tube can display numbers 0-9 and some letters and symbols. Each seven-segment digital tube is composed of 7 LEDs (light-emitting diodes), representing the 7 segments of the digital tube, including A, B, C, D, E, F, and G. By controlling the on and off combination of these LEDs, different numbers, letters or symbols can be displayed. The 188 digital tube has the advantages of clear display, low power consumption, and small size, and can provide an intuitive digital display interface.

[0035] Please refer to Figure 2 , which is a circuit schematic diagram of the detection and display circuit provided by an embodiment of the utility model.

[0036] In some embodiments of the present application, the detection and display circuit further includes capacitor C16, capacitor C19, capacitor C53, resistor R29, resistor R39, resistor R46, resistor R12 and resistor R30; the sampling resistor is an alloy resistor R50;

[0037] Among them, the 0th pin and the 6th pin of the CH528 chip are both grounded, the 1st pin, the 4th pin, the 5th pin, the 11th pin, the 16th pin, the 17th pin, the 18th pin and the 20th pin of the CH528 chip are all suspended, the 2nd pin of the CH528 chip is respectively connected to the VBUS_M power supply terminal and one end of the capacitor C16, the other end of the capacitor C16 is grounded, the 3rd pin, the 8th pin, the 9th pin, the 10th pin, the 12th pin and the 13th pin of the CH528 chip are all connected to the digital display, the 7th pin of the CH528 chip is respectively connected to the VDD power supply terminal and one end of the capacitor C19, the other end of the capacitor C19 is grounded, and the CH52 The 14th pin of the CH528 chip is respectively connected to one end of the capacitor C53, one end of the resistor R29 and one end of the resistor R39, the other end of the resistor R29 is connected to the VDD power supply terminal, the other end of the capacitor C53 is grounded, the other end of the resistor R39 is respectively connected to the ADC-GND power supply terminal and one end of the alloy resistor R50, the 15th pin of the CH528 chip is connected to one end of the resistor R46, the other end of the resistor R46 is respectively connected to the other end of the alloy resistor R50 and the ground end, the 19th pin of the CH528 chip is respectively connected to one end of the resistor R30 and one end of the resistor R12, the other end of the resistor R30 is grounded, and the other end of the resistor R12 is connected to the VBUS_M power supply terminal.

[0038] Specifically, the specific specifications of the capacitor C16, the capacitor C19, the capacitor C53, the resistor R29, the resistor R39, the resistor R46, the resistor R12, the resistor R30 and the alloy resistor R50 are as follows: Figure 2 As shown, no further description is given here.

[0039] In some embodiments of the present application, pin 3, pin 8, pin 9, pin 10, pin 12 and pin 13 of the CH528 chip are connected to the digital display through a resistor, and the resistor is 750 ohms.

[0040] Specifically, a resistor is connected between the digital display and the CH528 chip, which can not only play a role in current limiting protection, but also ensure signal stability and improve the flexibility of adjusting the brightness of the digital tube display.

[0041] In some embodiments of the present application, the PD charging circuit includes a PD protocol control chip, the PD protocol control chip is electrically connected to the MCU processing chip, and the PD protocol control chip is an LDR6020 chip.

[0042] Specifically, the LDR6020 chip has a set of downlink CC1 (pin 7) and CC2 (pin 8) pins, which are used to communicate with the fast charging charger that supports the PD protocol, obtain the power output capability of the fast charging, and apply for the appropriate charging power from the fast charging charger. The PD protocol control chip also has another set of uplink CC1 (pin 20) and CC2 (pin 21) pins, which are used to communicate with the charged device, broadcast the charging power it supports to it, and negotiate the appropriate charging power with the charged device.

[0043] Specifically, the LDR6020 chip is a highly integrated USB PD3.1 SOC control chip that can intelligently distribute the input power to multiple electronic devices and automatically adjust the output voltage and current according to the needs of each electronic device. This intelligent distribution method ensures that each electronic device can be fully charged and avoids the problem of overcharging or undercharging. In addition, the LDR6020 chip can also transmit data signals through the data line to achieve data transmission while charging.

[0044] Please refer to Figure 3 , which is a circuit schematic diagram of a PD charging circuit provided in an embodiment of the utility model.

[0045] In some embodiments of the present application, the PD charging circuit further includes capacitor C9, capacitor C3, resistor R4, resistor R10, resistor R14, capacitor C57, capacitor C56, capacitor C60, capacitor C58, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C61, capacitor C62, capacitor C65, capacitor C66 and resistor R19;

[0046] Among them, the 28th pin of the LDR6020 chip is respectively connected to one end of the capacitor C9, one end of the capacitor C3 and one end of the resistor R4, the other end of the capacitor C9 and the other end of the capacitor C3 are grounded, the other end of the resistor R4 is connected to the 5V power supply terminal, the 27th pin, the 29th pin and the 33rd pin of the LDR6020 chip are all grounded, the 21st pin of the LDR6020 chip is respectively connected to one end of the resistor R10 and one end of the capacitor C57, the other end of the resistor R10 is connected to the CONN-A_CC2 signal terminal, the other end of the capacitor C57 is grounded, and the 20th pin of the LDR6020 chip is respectively connected to one end of the resistor R14 and the capacitor C56. The other end of the resistor R14 is connected to the CONN-A_CC1 signal end, the other end of the capacitor C56 is grounded, the 9th pin of the LDR6020 chip is connected to the CONN-B_SBU_P signal end through the capacitor C60, the 10th pin of the LDR6020 chip is connected to the CONN-B_SBU_N signal end through the capacitor C58, the 11th pin of the LDR6020 chip is connected to the BB_D_P signal end through the resistor R15, the 12th pin of the LDR6020 chip is connected to the BB_D_N signal end through the resistor R16, the 7th pin of the LDR6020 chip is respectively connected to one end of the resistor R17 and one end of the capacitor C61, and the The other end of the resistor R17 is connected to the CONN-B_CC1 signal end, the other end of the capacitor C61 is grounded, the 8th pin of the LDR6020 chip is respectively connected to one end of the resistor R18 and one end of the capacitor C62, the other end of the resistor R18 is connected to the CONN-B_CC2 signal end, the other end of the capacitor C62 is grounded, the 22nd pin of the LDR6020 chip is respectively connected to one end of the capacitor C66 and the B_USB-C_VBUS_DET signal end, the other end of the capacitor C66 is grounded, the 23rd pin of the LDR6020 chip is respectively connected to one end of the capacitor C65 and the A_USB-C_VBUS_DET signal end, the capacitor C6 5 is grounded, pin 6, pin 13, pin 15, pin 16, pin 17, pin 19, pin 24, pin 25, pin 26, pin 32, pin 2, pin 18, pin 1, pin 5, pin 3 and pin 4 of the LDR6020 chip are all suspended, pin 14 of the LDR6020 chip is respectively connected to the SEL-UP signal terminal and one end of the resistor R19, the other end of the resistor R19 is connected to the LDO3.3V power supply terminal, pin 30 of the LDR6020 chip is connected to the B_VBUS_EN signal terminal, and pin 31 of the LDR6020 chip is connected to the A_VBUS_EN signal terminal.

[0047] Specifically, the specific specifications of the capacitor C9, capacitor C3, resistor R4, resistor R10, resistor R14, capacitor C57, capacitor C56, capacitor C60, capacitor C58, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C61, capacitor C62, capacitor C65, capacitor C66 and resistor R19 are as follows: Figure 3 As shown, no further details will be given here.

[0048] Please refer to Figure 4 , which is a circuit schematic diagram of a voltage switching circuit provided in an embodiment of the utility model.

[0049] In some embodiments of the present application, the PD charging circuit further includes a voltage switching circuit for switching upstream power supply and downstream power supply, and the voltage switching circuit is electrically connected to the PD protocol control chip.

[0050] Specifically, the voltage switching circuit includes dual P-MOS tubes for switching between uplink power supply and downlink power supply. Figure 4 As shown, no further description is given here.

[0051] Please refer to Figure 5 , which is a circuit schematic diagram of the power supply circuit provided in an embodiment of the utility model.

[0052] In some embodiments of the present application, the circuit further includes a power supply circuit for providing a 5V voltage, and the power supply circuit is electrically connected to the MCU processing chip.

[0053] Specifically, the power supply circuit includes a DC-DC (Direct Current / Direct Current) step-down converter, which is used to convert the input 5-20V voltage into a fixed 5V output to provide 5V voltage for the circuit. Figure 5 As shown, no further description is given here.

[0054] In some embodiments of the present application, the circuit is arranged in a fast charging device supporting the PD protocol, and the digital display is located on the outer surface of the fast charging device.

[0055] Specifically, when selecting a fast charging device that supports the PD protocol, you should ensure that it supports the PD protocol. When selecting an electronic device that is electrically connected to the fast charging device for PD fast charging, you should also ensure that it supports the PD protocol, and the two need to be compatible with each other to successfully complete PD fast charging. The digital display is set on the outer surface of the fast charging device, which can facilitate user observation.

[0056] In some embodiments of the present application, the fast charging device includes a charger, a docking station and a fast charging cable.

[0057] Specifically, in order to support the PD protocol, the charger usually uses a USB-C interface. Most C-port chargers will indicate the supported PD protocol gears in the output label, such as 5V, 9V, 12V, 15V and 20V. If the docking station has a PD fast charging port, it can be used with a Type-C male-to-male cable and a PD charger that supports PD fast charging. Fast charging cables that support the PD protocol usually have pull-down resistors to communicate with chargers and devices that support the PD protocol.

[0058] The circuit for displaying PD charging power provided in this embodiment is arranged on a PD fast charging device, such as a charger, an expansion dock or a fast charging cable, to achieve real-time detection and display in real time the PD charging power allocated to the electronic device by the PD fast charging charger, so as to facilitate real-time observation. The circuit structure is simple, the feasibility is strong, and the user experience is high.

[0059] It should be noted that the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A circuit for displaying PD charging power, characterized in that: It includes a PD charging circuit and a detection and display circuit for detecting and displaying the PD charging power of the PD charging circuit. The detection and display circuit includes an MCU processing chip, a sampling resistor and a digital display. The sampling resistor and the digital display are electrically connected to the MCU processing chip respectively. The MCU processing chip is also electrically connected to the PD charging circuit. The MCU processing chip is a CH528 chip, the sampling resistor is a surface-mount alloy resistor, and the digital display is a 188 digital tube.

2. The circuit for displaying PD charging power according to claim 1, characterized in that: The detection and display circuit also includes capacitor C16, capacitor C19, capacitor C53, resistor R29, resistor R39, resistor R46, resistor R12 and resistor R30; the sampling resistor is an alloy resistor R50; Among them, the 0th pin and the 6th pin of the CH528 chip are both grounded, the 1st pin, the 4th pin, the 5th pin, the 11th pin, the 16th pin, the 17th pin, the 18th pin and the 20th pin of the CH528 chip are all suspended, the 2nd pin of the CH528 chip is respectively connected to the VBUS_M power supply terminal and one end of the capacitor C16, the other end of the capacitor C16 is grounded, the 3rd pin, the 8th pin, the 9th pin, the 10th pin, the 12th pin and the 13th pin of the CH528 chip are all connected to the digital display, the 7th pin of the CH528 chip is respectively connected to the VDD power supply terminal and one end of the capacitor C19, the other end of the capacitor C19 is grounded, and the CH52 The 14th pin of the CH528 chip is respectively connected to one end of the capacitor C53, one end of the resistor R29 and one end of the resistor R39, the other end of the resistor R29 is connected to the VDD power supply terminal, the other end of the capacitor C53 is grounded, the other end of the resistor R39 is respectively connected to the ADC-GND power supply terminal and one end of the alloy resistor R50, the 15th pin of the CH528 chip is connected to one end of the resistor R46, the other end of the resistor R46 is respectively connected to the other end of the alloy resistor R50 and the ground end, the 19th pin of the CH528 chip is respectively connected to one end of the resistor R30 and one end of the resistor R12, the other end of the resistor R30 is grounded, and the other end of the resistor R12 is connected to the VBUS_M power supply terminal.

3. The circuit for displaying PD charging power according to claim 2, characterized in that: The 3rd pin, the 8th pin, the 9th pin, the 10th pin, the 12th pin and the 13th pin of the CH528 chip are all connected to the digital display through a resistor, and the resistor is 750 ohms.

4. The circuit for displaying PD charging power according to claim 1, characterized in that: The PD charging circuit includes a PD protocol control chip, the PD protocol control chip is electrically connected to the MCU processing chip, and the PD protocol control chip is an LDR6020 chip.

5. The circuit for displaying PD charging power according to claim 4, characterized in that: The PD charging circuit also includes capacitor C9, capacitor C3, resistor R4, resistor R10, resistor R14, capacitor C57, capacitor C56, capacitor C60, capacitor C58, resistor R15, resistor R16, resistor R17, resistor R18, capacitor C61, capacitor C62, capacitor C65, capacitor C66 and resistor R19; Among them, the 28th pin of the LDR6020 chip is respectively connected to one end of the capacitor C9, one end of the capacitor C3 and one end of the resistor R4, the other end of the capacitor C9 and the other end of the capacitor C3 are grounded, the other end of the resistor R4 is connected to the 5V power supply terminal, the 27th pin, the 29th pin and the 33rd pin of the LDR6020 chip are all grounded, the 21st pin of the LDR6020 chip is respectively connected to one end of the resistor R10 and one end of the capacitor C57, the other end of the resistor R10 is connected to the CONN-A_CC2 signal terminal, the other end of the capacitor C57 is grounded, the 20th pin of the LDR6020 chip is respectively connected to one end of the resistor R14 and one end of the capacitor C56, the other end of the resistor R14 is connected to the CONN-A_CC1 signal terminal, the other end of the capacitor C56 is grounded, and the LD The 9th pin of the R6020 chip is connected to the CONN-B_SBU_P signal end through the capacitor C60, the 10th pin of the LDR6020 chip is connected to the CONN-B_SBU_N signal end through the capacitor C58, the 11th pin of the LDR6020 chip is connected to the BB_D_P signal end through the resistor R15, the 12th pin of the LDR6020 chip is connected to the BB_D_N signal end through the resistor R16, the 7th pin of the LDR6020 chip is respectively connected to one end of the resistor R17 and one end of the capacitor C61, the other end of the resistor R17 is connected to the CONN-B_CC1 signal end, the other end of the capacitor C61 is grounded, the 8th pin of the LDR6020 chip is respectively connected to one end of the resistor R18 and one end of the capacitor C62, the other end of the resistor R18 is connected to the CONN- The other end of the capacitor C62 is grounded, the 22nd pin of the LDR6020 chip is respectively connected to one end of the capacitor C66 and the B_USB-C_VBUS_DET signal end, the other end of the capacitor C66 is grounded, the 23rd pin of the LDR6020 chip is respectively connected to one end of the capacitor C65 and the A_USB-C_VBUS_DET signal end, the other end of the capacitor C65 is grounded, the 6th pin, the 13th pin, the 15th pin, the 16th pin, the 17th pin of the LDR6020 chip , pin 19, pin 24, pin 25, pin 26, pin 32, pin 2, pin 18, pin 1, pin 5, pin 3 and pin 4 are all suspended, pin 14 of the LDR6020 chip is respectively connected to the SEL-UP signal terminal and one end of the resistor R19, the other end of the resistor R19 is connected to the LDO3.3V power supply terminal, pin 30 of the LDR6020 chip is connected to the B_VBUS_EN signal terminal, and pin 31 of the LDR6020 chip is connected to the A_VBUS_EN signal terminal.

6. The circuit for displaying PD charging power according to claim 4, characterized in that: The PD charging circuit also includes a voltage switching circuit for switching between upstream power supply and downstream power supply, and the voltage switching circuit is electrically connected to the PD protocol control chip.

7. The circuit for displaying PD charging power according to claim 1, characterized in that: The circuit also includes a power supply circuit for providing a 5V voltage, and the power supply circuit is electrically connected to the MCU processing chip.

8. The circuit for displaying PD charging power according to claim 1, characterized in that: The circuit is arranged on a fast charging device supporting the PD protocol, and the digital display is located on the outer surface of the fast charging device.

9. The circuit for displaying PD charging power according to claim 8, characterized in that: The fast charging device includes a charger, a docking station and a fast charging cable.

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