Power transmission system

Abstract

The utility model provides a power transmission system. The power supply device provides supplier custom information to the power receiving device through the configuration channel pin so as to request the power receiving device to enter a low-power-consumption mode, and in the low-power-consumption mode, the power supply device controls the pull-up circuit to stop providing current to the configuration channel pin when declaring that the state of the pull-up circuit is SinkTxOK.

Description

Technical Field

[0001] The utility model relates to an electronic device, in particular to a power transmission system. Background Art

[0002] The Universal Serial Bus (USB) Type-C connector can simultaneously support data, audio, video transmission, reversible insertion, and high-efficiency charging functions, and has the characteristics of high compatibility and high transmission rate. Therefore, it is widely used in information and communication devices. For example, electronic devices such as smartphones, laptops, desktop computers, game consoles, etc. have begun to use the USB Type-C transmission interface.

[0003] Generally speaking, when charging is performed via a USB Type-C interface, the power supply device and the powered device need to communicate the Power Delivery (PD) protocol via the Configuration Channel (CC) pin to determine the charging specifications, wherein the power supply device can confirm the connection status with the powered device by pulling up the current provided by the pull-up resistor in the power supply device. Utility Model Content

[0004] The utility model provides a power transmission system, which can effectively reduce the power consumption of the power transmission system.

[0005] The power transmission system of the utility model includes a power receiving device, a configuration channel pin and a power supply device. The power receiving device includes a pull-down resistor. The power supply device includes a pull-up circuit, the pull-up circuit is coupled to the pull-down resistor through the configuration channel pin, and the power supply device provides a supplier-defined information to the power receiving device through the configuration channel pin to request the power receiving device to enter a low power consumption mode. In the low power consumption mode, the power supply device controls the pull-up circuit to stop providing current to the configuration channel pin when the state of the pull-up circuit is declared to be SinkTxOK.

[0006] In an embodiment of the present invention, the power supply device controls the pull-up circuit to provide a preset current when the state of the pull-up circuit is declared to be SinkTxNG.

[0007] In an embodiment of the present invention, the preset current is 80uA or 180uA.

[0008] In one embodiment of the present invention, the power supply device responds that the powered device does not support the low power consumption mode and enters the general mode. In the general mode, the power supply device controls the pull-up circuit to provide a first preset current when the state of the pull-up circuit is declared to be SinkTxOK, and controls the pull-up circuit to provide a second preset current when the state of the pull-up circuit is declared to be SinkTxNG, wherein the first preset current is greater than the second preset current.

[0009] In an embodiment of the present invention, the first preset current is 330uA, and the second preset current is 80uA or 180uA.

[0010] In an embodiment of the present invention, the pull-up circuit is a current source.

[0011] In an embodiment of the present invention, the resistance value of the pull-down resistor is 5.1 ohms.

[0012] In one embodiment of the present invention, the pull-up circuit includes a resistor circuit and a switch circuit. The resistor circuit is coupled between a reference voltage and a configuration channel pin. The switch circuit is coupled between the resistor circuit and the configuration channel pin, and the power supply device controls the conduction state of the switch circuit and adjusts the resistance value of the resistor circuit to control the current provided by the pull-up circuit to the configuration channel pin.

[0013] In an embodiment of the present invention, the power supply device controls the switch circuit to be disconnected when the state of the pull-up circuit is declared to be SinkTxOK, so as to control the pull-up circuit to stop providing current to the configuration channel pin.

[0014] In an embodiment of the present invention, the power supply device controls the switch circuit to conduct and adjusts the resistance value of the resistance circuit when the state of the pull-up circuit is declared to be SinkTxNG, so as to control the pull-up circuit to provide a preset current.

[0015] Based on the above, the power supply device of the embodiment of the utility model can provide the vendor-defined information to the powered device through the configuration channel pin to request the powered device to enter the low power consumption mode. In the low power consumption mode, the power supply device controls the pull-up circuit to stop providing current to the configuration channel pin when the state of the pull-up circuit is declared to be SinkTxOK. In this way, after the power supply device and the powered device enter the low power consumption mode by using the vendor-defined information, the pull-up circuit is controlled to stop providing current to the configuration channel pin, and the voltage on the configuration channel pin corresponding to the state of the pull-up circuit when the state of the pull-up circuit is declared to be SinkTxOK is set to 0 volts, which can effectively reduce the power consumption of the power transmission system.

[0016] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a power transmission system according to the utility model;

[0018] Figure 2 is a schematic diagram of a power transmission system according to another embodiment of the utility model. DETAILED DESCRIPTION

[0019] Figure 1 1 is a schematic diagram of a power transmission system according to the present invention. The power transmission system 100 includes a power supply device 102, a configuration channel pin CC1, and a power receiving device 104. The power supply device 102 is coupled to the power receiving device 104 via the configuration channel pin CC1, that is, the power supply device 102 and the power receiving device 104 are connected via a USB Type-C interface. The power supply device 102 may be, for example, a charger or an adapter, and the power receiving device 104 may be, for example, an electronic device such as a mobile phone, a laptop computer, a desktop computer, a game console, etc., but is not limited thereto.

[0020] Furthermore, the power delivery integrated circuit (PDIC) of the power supply device 102 may include a pull-up circuit 106. The pull-up circuit 106 is coupled to the configuration channel pin CC1, and is coupled to the pull-down resistor Rd of the power receiving device 104 through the configuration channel pin CC1. The pull-down resistor Rd is coupled between the configuration channel pin CC1 and the ground GND, wherein the resistance value of the pull-down resistor Rd may be, for example, 5.1 ohms, but is not limited thereto. In addition, the resistor RCB and the resistor RCON are connected in series between the ground terminal of the power supply device 102 and the power receiving device 104, wherein the resistor RCB represents the resistance of the cable, and the resistor RCON represents the contact resistance.

[0021] The pull-up circuit 106 of the power supply device 102 can be used to provide current to the configuration channel pin CC1 to change the voltage on the configuration channel pin CC1, and confirm the connection status with the power receiving device 104 according to the voltage on the configuration channel pin CC1. In this embodiment, the pull-up circuit 106 includes a current source Ip, and the power supply device 102 can adjust the current provided by the current source Ip to change the voltage on the configuration channel pin CC1. In addition, the power supply device 102 can provide a vendor defined message (Vendor Defined Message, VDM) to the power receiving device 104 through the configuration channel pin CC1 to request the power receiving device 104 to enter the low power mode defined by the vendor defined message, and determine whether the power receiving device 104 supports the low power mode according to the response instruction of the power receiving device 104. In the case that the power receiving device 104 supports the low power mode, the power supply device 102 and the power receiving device 104 enter the low power mode, and the power supply device 102 can communicate and transmit power with the power receiving device 104 according to the protocol of the vendor defined message.

[0022] In the low power mode, when the power supply device 102 declares that the state of the pull-up circuit 106 is SinkTxOK, that is, when the power supply device 102 declares that the power receiving device 104 is allowed to transmit data through the configuration channel pin CC1 (for example, transmitting an atomic message sequence (AMS), but not limited to this), the power supply device 102 can stop providing current by controlling the current source IP, and set the voltage on the configuration channel pin CC1 to 0 volts. In this way, the power receiving device 104 can determine whether data can be transmitted to the power supply device 102 through the configuration channel pin CC1 based on whether the voltage on the channel pin CC1 is 0 volts, so as to prevent collisions from occurring. For example, the power receiving device 104 can determine whether the voltage on the channel pin CC1 is maintained at 0 volts for a preset period of time. If the voltage on the channel pin CC1 is maintained at 0 volts for a preset period of time, it is determined that data can be transmitted to the power supply device 102 through the configuration channel pin CC1.

[0023] In addition, in the low power mode, when the power supply device 102 declares that the state of the pull-up circuit 106 is SinkTxNG, that is, when the power supply device 102 declares that the powered device 104 is not allowed to transmit data through the configuration channel pin CC1, the corresponding voltage on the configuration channel pin CC1 may be, for example, 0.9 volts, and the power supply device 102 may, for example, adjust the current source IP to provide a preset current (e.g., 180uA) to set the voltage on the configuration channel pin CC1 to 0.9 volts. It is worth noting that in other embodiments, the voltage on the configuration channel pin CC1 corresponding to when the power supply device 102 declares that the state of the pull-up circuit 106 is SinkTxNG may also be set to other voltage values, such as 0.4 volts (the current source IP provides a preset current of 80uA), and is not limited to this embodiment.

[0024] In this way, after the power supply device 102 and the power receiving device 104 enter the low power consumption mode by using the vendor-defined information, the pull-up circuit 106 is controlled to stop providing current to the configuration channel pin CC1, and the voltage on the configuration channel pin CC1 corresponding to the state of the pull-up circuit 106 being declared as SinkTxOK is set to 0 volts, which can effectively reduce the power consumption of the power transmission system 100. In some embodiments, the setting value of the voltage on the configuration channel pin CC1 corresponding to the state of the pull-up circuit 106 being declared as SinkTxNG by the power supply device 102 can be further reduced to further reduce the power consumption of the power transmission system 100.

[0025] In addition, when the powered device 104 does not support the low power mode, the power supply device 102 may enter the normal mode, and communicate and transmit power to the powered device 104 according to the original power transmission protocol of the power transmission system. In the normal mode, when the power supply device 102 declares that the state of the pull-up circuit 106 is SinkTxOK, the power supply device 102 may, for example, control the current source IP to provide a first preset current to set the voltage on the configuration channel pin CC1 to 1.6 volts corresponding to the SinkTxOK state. In addition, when the power supply device 102 declares that the state of the pull-up circuit 106 is SinkTxNG, the power supply device 102 may, for example, control the current source IP to provide a second preset current (e.g., 80uA or 180uA) to set the voltage on the configuration channel pin CC1 to 0.4 or 0.9 volts. In this way, when the power receiving device 104 does not support the low power mode, the power transmission system 100 switches to the normal mode to communicate and transmit power to the power receiving device 104 according to the original power transmission protocol, so that the use of the power transmission system 100 is more flexible.

[0026] Figure 2 is a schematic diagram of a power transmission system according to another embodiment of the utility model. Figure 1The difference between the embodiments is that, in this embodiment, the pull-up circuit 106 may include a resistor circuit RP and a switch circuit SW1, and the resistor circuit RP and the switch circuit SW1 are connected in series between the reference voltage VCC and the configuration channel pin CC1, wherein the resistor circuit RP may, for example, include at least one resistor, and the switch circuit SW1 may, for example, be implemented by a transistor, but is not limited thereto.

[0027] The power supply device 102 can control the conduction state of the switch circuit SW1 and adjust the resistance value of the resistor circuit 106 to control the current provided by the pull-up circuit 106 to the configuration channel pin CC1. For example, the power supply device 102 can control the switch circuit SW1 to be turned off when the state of the pull-up circuit 106 is declared to be SinkTxOK, so as to control the pull-up circuit 106 to stop providing current to the configuration channel pin CC1. In addition, when the state of the pull-up circuit 106 is declared to be SinkTxNG, the switch circuit SW1 can be controlled to be turned on and the resistance value of the resistor circuit 106 can be adjusted to control the pull-up circuit to provide a preset current (e.g., 80uA or 180uA). The power supply device 102 transmits the vendor-defined information to the powered device 104 to request the powered device 104 to enter the low power mode defined by the vendor-defined information, and the communication and power transmission method with the powered device 104 in the low power mode according to the protocol of the vendor-defined information is the same as the above embodiment, so it is not repeated here. In some embodiments, the power supply device 102 may also change the current provided by the pull-up circuit 106 by, for example, adjusting the voltage value of the reference voltage VCC, but is not limited to this embodiment.

[0028] In summary, the power supply device of the embodiment of the utility model can provide the vendor-defined information to the powered device through the configuration channel pin to request the powered device to enter the low power consumption mode. In the low power consumption mode, the power supply device controls the pull-up circuit to stop providing current to the configuration channel pin when the state of the pull-up circuit is declared to be SinkTxOK. In this way, after the power supply device and the powered device enter the low power consumption mode by using the vendor-defined information, the pull-up circuit is controlled to stop providing current to the configuration channel pin, and the voltage on the configuration channel pin corresponding to the state of the pull-up circuit being declared to be SinkTxOK is set to 0 volts, which can effectively reduce the power consumption of the power transmission system.

[0029] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A power transmission system, characterized in that: include: a powered device including a pull-down resistor; Configure channel pins; as well as A power supply device, comprising a pull-up circuit, wherein the pull-up circuit is coupled to the pull-down resistor via the configuration channel pin, and the power supply device provides vendor-defined information to the powered device via the configuration channel pin to request the powered device to enter a low power consumption mode. In the low power consumption mode, the power supply device controls the pull-up circuit to stop providing current to the configuration channel pin when declaring the state of the pull-up circuit to be SinkTxOK.

2. The power transmission system according to claim 1, characterized in that: The power supply device controls the pull-up circuit to provide a preset current when declaring the state of the pull-up circuit to be SinkTxNG.

3. The power transmission system according to claim 2, characterized in that: The preset current is 80uA or 180uA.

4. The power transmission system according to claim 1, characterized in that: The power supply device responds that the powered device does not support the low power consumption mode and enters the general mode. In the general mode, the power supply device controls the pull-up circuit to provide a first preset current when declaring the state of the pull-up circuit to be SinkTxOK, and controls the pull-up circuit to provide a second preset current when declaring the state of the pull-up circuit to be SinkTxNG, wherein the first preset current is greater than the second preset current.

5. The power transmission system according to claim 4, characterized in that: The first preset current is 330uA, and the second preset current is 80uA or 180uA.

6. The power transmission system according to claim 1, characterized in that: The pull-up circuit is a current source.

7. The power transmission system according to claim 1, characterized in that: The resistance value of the pull-down resistor is 5.1 ohms.

8. The power transmission system according to claim 1, characterized in that: The pull-up circuit comprises: a resistor circuit coupled between a reference voltage and the configuration channel pin; and The switch circuit is coupled between the resistance circuit and the configuration channel pin. The power supply device controls the conduction state of the switch circuit and adjusts the resistance value of the resistance circuit to control the current provided by the pull-up circuit to the configuration channel pin.

9. The power transmission system according to claim 8, characterized in that: The power supply device controls the switch circuit to be disconnected when declaring the state of the pull-up circuit to be SinkTxOK, so as to control the pull-up circuit to stop providing current to the configuration channel pin.

10. The power transmission system according to claim 8, characterized in that: The power supply device controls the switch circuit to be turned on and adjusts the resistance value of the resistance circuit when the state of the pull-up circuit is declared to be SinkTxNG, so as to control the pull-up circuit to provide a preset current.

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