Adaptive power supply transmission power setting and protection method and power supply system

Abstract

The embodiment of the invention relates to an adaptive power supply transmission power setting and protecting method and a power supply system. The adaptive power supply transmission power setting and protection method comprises the following steps: providing a power supply and signal transmission line between a power supply end and a power supply receiving end; providing a corresponding output voltage according to a power requirement transmitted by the power supply receiving end from the power supply and the signal transmission line; monitoring an output current from the power supply terminal; receiving a feedback receiving voltage from the power supply receiving end through the power supply and the signal transmission line; when the ratio of the output current to the receiving voltage exceeds a standard, the output current is limited; and when the ratio of the output current to the receiving voltage is within the specification, increasing the output voltage according to the feedback receiving voltage so as to carry out voltage compensation on the receiving voltage.

Description

TECHNICAL FIELD

[0001] A power supply technology, and particularly an adaptive power delivery power setting and protection method and power supply system is disclosed. BACKGROUND

[0002] Figure 1 A circuit block diagram of a universal serial bus type-C (USB-C) charging system is shown as prior art. Please refer to Figure 1 The USB-C charging system includes a power supply end 101, a power receiving end 102, and a power and signal transmission line 103. The power supply end 101 transmits power to the power receiving end 102 through the bus power line VBUS of the power and signal transmission line 103, and the power receiving end 102 and the power supply end 101 communicate with each other through the configuration channel (CC pin) CC using a predetermined protocol to ensure efficient power transmission.

[0003] In addition, a general USB-C charging protocol, such as universal serial bus power delivery (USB PD), can allow the charger and the receiving end to negotiate a suitable charging voltage and current, thereby improving charging efficiency and safety. The information fed back by the power receiving end 102 through the configuration channel CC includes battery voltage, battery current, battery temperature, etc. In addition, the programmable power supply standard (PPS) is a protocol developed by Qualcomm, which can allow the charger to provide more accurate charging voltage and current according to the actual needs of the receiving end, thereby further improving charging efficiency and safety. In this protocol, the power receiving end 102 feeds back battery voltage, battery current, battery temperature, battery health status, battery manufacturing information, etc. through the configuration channel CC.

[0004] However, in the above-mentioned USB-C charging system, the power and signal transmission line 103 used by the user generally has a certain impedance, which will cause the difference between the voltage levels at both ends of the bus power line VBUS of the power supply end 101 and the power receiving end 102. In particular, when high-power and high-current transmission is performed, the difference will be quite obvious. SUMMARY

[0005] According to the problems of the prior art described above, the purpose of the present application is to provide a sleeve with torque and angle sensing and signal transmission functions to improve its practicality and convenience in operation.

[0006] Embodiments of the present application provide a method for adaptive power delivery power setting and protection, and a power supply system using the method, to mitigate voltage difference between two ends of a bus power line of a power supply and signal transmission line caused by impedance.

[0007] Another embodiment of the present application provides a method for adaptive power delivery power setting and protection, and a power supply system using the method, to obtain impedance between two ends of a bus power line of a power supply and signal transmission line, to avoid current overheat.

[0008] To achieve the above object, the present application provides a method for adaptive power delivery power setting and protection, which is applicable to a power supply end, wherein the power supply end and a power receiving end are connected through a power supply and signal transmission line, and the method comprises the following steps: at the power supply end, providing corresponding output voltage and output current according to power requirement transmitted from the power receiving end through the power supply and signal transmission line; at the power supply end, receiving feedback receiving voltage from the power receiving end through the power supply and signal transmission line; when the ratio of the output current and the receiving voltage exceeds a specification, limiting the output current at the power supply end; and when the ratio of the output current and the receiving voltage is within the specification, adjusting the output voltage at the power supply end according to the feedback receiving voltage.

[0009] To achieve the above object, the present application provides a method for adaptive power delivery power setting and protection, which is applicable to a power supply end, wherein the power supply end and a power receiving end are connected through a power supply and signal transmission line, and the method comprises the following steps: at the power supply end, providing corresponding output voltage and output current according to power requirement transmitted from the power receiving end through the power supply and signal transmission line; at the power supply end, receiving feedback receiving voltage from the power receiving end through the power supply and signal transmission line; when the ratio of the output current and the receiving voltage exceeds a specification, limiting the output current at the power supply end; and when the ratio of the output current and the receiving voltage is within the specification, adjusting the output voltage at the power supply end according to the feedback receiving voltage.

[0010] Preferably, the adaptive power delivery power setting and protection method and the power supply system using the same according to the preferred embodiments of the present application, the power and signal transmission line includes a channel configuration signal line (CC), wherein the power receiving end feeds back a received voltage from the channel configuration signal line. In a preferred embodiment, the power supply end calculates the impedance of the power and signal transmission line according to the output current and the received voltage fed back by the power receiving end. In a preferred embodiment, the power supply end determines that the impedance exceeds the specification and limits the output current. The power supply end determines that the impedance is within the specification, and the power supply end increases the output voltage to perform voltage compensation according to the difference between the received voltage and the output voltage.

[0011] Preferably, the adaptive power delivery power setting and protection method and the power supply system using the same according to the preferred embodiments of the present application, the power receiving end transmits a power requirement through a mobile terminal fusion universal fast charging specification (UFCS) protocol, and the power receiving end feeds back a received voltage from the power and signal transmission line through a universal asynchronous receiver / transmitter (UART) protocol.

[0012] In summary, the embodiments of the present application feed back a received voltage received through the power and signal transmission line at the power receiving end using a data transmission method, so that the power supply end can know the impedance of the power and signal transmission line used by the user in real time. If the impedance exceeds the safety specification, the current can be limited in time to avoid burning of the power and signal transmission line. Furthermore, even if the impedance of the power and signal transmission line meets the specification, voltage compensation can be performed at the power supply end according to the received voltage fed back, so that the power receiving end can receive complete required power.

[0013] For further understanding of the technical solutions, means and effects of the present application, reference can be made to the following detailed description and drawings, so that the purpose, features and concepts of the present application can be thoroughly and specifically understood. However, the following detailed description and drawings are only used for reference and illustration of the implementation manner of the present application, and are not used for limiting the present application. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 a circuit block diagram of a universal serial bus TYPE-C (C-TYPE) charging system of the prior art;

[0015] Figure 2 a system block diagram of a power supply system according to the preferred embodiments of the present application;

[0016] Figure 3 Flowchart of adaptive power delivery power setting and protection method for preferred embodiments of the present application.

[0017] Legend of symbols

[0018] 101: power provider

[0019] 102: power sink

[0020] 103: power and signal transmission line

[0021] CC: channel configuration signal line

[0022] 201: power and signal transmission line

[0023] 202: power sink

[0024] 203: power provider

[0025] VBUS: bus power line

[0026] GND: ground line DETAILED DESCRIPTION

[0027] Reference will now be made in detail to the exemplary embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. In addition, the exemplary embodiments are merely examples of the design of the present application, and the following description of the exemplary embodiments is not intended to limit the present application.

[0028] Figure 2 System block diagram of a power supply system for preferred embodiments of the present application is shown. Please refer to FIG. 1. Figure 2 The power supply system includes a power and signal transmission line 201, a power sink 202, and a power provider 203. In this embodiment, the power and signal transmission line 201 is exemplified by a Universal Serial Bus TYPE-C (USB-C) transmission line.

[0029] In this embodiment, when the power supply end 203 charges the power receiving end 202, the power supply end 203 and the power receiving end 202 are coupled to the two ends of the power and signal transmission line 201 respectively. Then, the power receiving end 202 transmits the power requirement to the power supply end 203 through the channel configuration signal line CC of the power and signal transmission line 201. After the power supply end 203 receives the power requirement through the channel configuration signal line CC of the power and signal transmission line 201, the power supply end 203 can output the corresponding output voltage from the bus power line VBUS end according to the power requirement and the supported fast charging protocol specification.

[0030] However, the resistance of the bus power line VBUS or the ground line GND of the power and signal transmission line 201 is not 0. Generally, in order to ensure that the receiving end can obtain sufficient voltage and current, the USB standard stipulates that the resistance of the bus power line VBUS should be less than 100 mΩ (0.1 Ω). In general cases, the resistance of the bus power line VBUS of the USB is between 10 mΩ and 50 mΩ. However, after long-term use, the power and signal transmission line 201 may be folded or affected by other use factors, or the user may purchase a power and signal transmission line 201 that does not meet the standard, resulting in a too high resistance of the bus power line VBUS.

[0031] In the above case, assuming the resistance is 0.5 Ω, at the charging speed of the general output voltage 5 V and the current 0.5 A, the power receiving end 202 receives the voltage 4.75 V and the current 0.5 A from the bus power line VBUS, that is, the power of 2.75 W, and this voltage still belongs to the USB standard specification, so it does not cause too many problems. However, in the case of fast charging of 30 W required by the power receiving end 202, for example, the output voltage 15 V and the current 2 A, the power receiving end 202 receives the voltage of only 14 V from the bus power line VBUS, which exceeds the USB standard specification. In addition, since the impedance of the wire body and the joint contact point is 0.5 Ω, the power consumption of the power and signal transmission line 201 is 1 W, which may cause the power and signal transmission line 201 to burn out.

[0032] Therefore, in this embodiment, the power receiving end 202 and the power supply end 203 are additionally designed with a new transmission instruction and feedback mechanism. The power receiving end 202 uses the channel configuration signal line CC to feed back the received voltage from the bus power line VBUS to the power supply end 203 through the power and signal transmission line 201. The power supply end 203 decodes the received voltage as 14V from the channel configuration signal line CC, and detects that the output current is 2A from the feedback mechanism of its own circuit. At this time, the power supply end 203 can estimate the impedance of the power and signal transmission line 201 by the output current and the received voltage.

[0033] When the power supply end 203 finds out the impedance of the power and signal transmission line 201 by the output current, the received voltage and the voltage difference between the output voltage, it can determine whether it is feasible to maintain, for example, the above-mentioned 2A current. In this embodiment, an impedance upper limit value, for example, 0.25Ω, is set. The estimated impedance of the power supply end 203 is 0.5Ω, so in this embodiment, it has exceeded the specification, so the power supply end 203 starts to limit the output current to avoid the power and signal transmission line 201 from being burned out. In this embodiment, since the resistance has exceeded the range of reasonable impedance size, there is a very high possibility that the power and signal transmission line 201 is damaged. In this preferred embodiment, in addition to having to lower the voltage level of the bus power line VBUS and the overcurrent protection level to an absolutely safe level, a warning signal is also generated to inform the user to check the reliability of the power and signal transmission line 201.

[0034] Suppose that the impedance of the power and signal transmission line 201 is 0.25Ω, and the power receiving end 202 also requires, for example, 30W fast charging, such as the above-mentioned output voltage 15V and current 2A charging speed. At this time, the received voltage received by the power receiving end 202 is 14.5V, and is also fed back to the power supply end 203 through the power and signal transmission line 201 by using the channel configuration signal line CC. The power supply end 203 receives the above-mentioned received voltage 14.5V data, judges that the impedance value is 0.25Ω, and the impedance value 0.25Ω meets the specification, so the power supply end 203 increases the output voltage to 15.5V, so that the received voltage received by the power receiving end 202 is 15V, thereby compensating for the voltage difference caused by the above-mentioned impedance value 0.25Ω. In this way, complete 30W can be transmitted to the power receiving end 202.

[0035] Although the above embodiments are exemplified by calculating the impedance, those skilled in the art should know that the ratio of voltage to current can also be used as an embodiment, and even the reciprocal of resistance, i.e. conductance, can also be used as a judgment mechanism, so the present application is not limited thereto. In addition, although the above embodiments are used for fast charging of the Type-C transmission line specification, such as power delivery or programmable power supply (PPS), those skilled in the art should know that, in addition to the above specifications, the present application can also use, for example, the universal fast charging specification (UFCS), the difference being that the above embodiments use the channel configuration signal line CC for modulation and transmission, while the universal fast charging specification uses the data positive end D+ and the data negative end D- of the universal serial bus for transmission through the universal asynchronous receiver / transmitter (UART) interface. In addition, the universal fast charging specification can also use the channel configuration signal lines CC1 and CC2 to perform data transmission through the inter-integrated circuit (I2C) interface. Since the I2C interface and the UART interface do not require additional hardware circuit support and do not require additional software protocols, the interface cost and complexity can be reduced. Therefore, the present application is not limited to the above embodiments.

[0036] The above embodiments can be summarized as an adaptive power transmission power setting and protection method, Figure 3 A flowchart of an adaptive power transmission power setting and protection method according to a preferred embodiment of the present application is shown. Please refer to Figure 3 The adaptive power transmission power setting and protection method comprises the following steps:

[0037] Step S301: Start.

[0038] Step S302: Provide a power supply and signal transmission line between the power supply end and the power receiving end.

[0039] Step S303: Provide a corresponding output voltage according to the power requirement transmitted by the power receiving end from the power supply and signal transmission line.

[0040] Step S304: Provide and monitor the output current from the power supply end.

[0041] Step S305: receiving the feedback received voltage from the power receiving end through the power and signal transmission line. As described above, the power receiving end needs to have the ability to detect the received voltage and to feedback the received voltage to the power supply end through, for example, the channel configuration signal line CC, and the power supply end must have the ability to decode the received voltage transmitted from the channel configuration signal line CC.

[0042] Step S306: judging the ratio of the output current and the received voltage. As described above, by the output current and the feedback received voltage, the resistance value of the bus power line VBUS of the power and signal transmission line can be estimated. Thus, it can be judged whether the power and signal transmission line meets the specification. If it exceeds the specification, step S307 is performed. If it meets the specification, step S308 is performed.

[0043] Step S307: limiting the output current. As described above, when the resistance value of the bus power line VBUS exceeds the specification, for example, 0.5Ω, this resistance value is likely to cause the power and signal transmission line to burn out in the case of high power transmission, so the power supply end limits the output current. In addition, if the resistance has exceeded the range of reasonable impedance size, the voltage level of the bus power line VBUS and the overcurrent protection level are also lowered to an absolutely safe level, and a warning signal is generated to notify the user to check the reliability of the power and signal transmission line 201.

[0044] Step S308: increasing the output voltage to perform voltage compensation for the received voltage. According to the feedback received voltage, the output voltage is increased to perform voltage compensation for the received voltage. For example, when the resistance value of the bus power line VBUS is just within the specification, for example, 0.25Ω, at this time, the received voltage is 14.5V, so the output voltage is increased by 0.5V to 15.5V, at this time, the received voltage received by the power receiving end will meet the power required by the power receiving end.

[0045] In summary, the embodiments of the present application use the data transmission method to feedback the received received voltage from the power receiving end through the power and signal transmission line, so that the power supply end can know the impedance of the power and signal transmission line used by the user in real time. If the impedance exceeds the safety specification, the current can be limited in time to avoid the burning of the power and signal transmission line. Furthermore, even if the impedance of the power and signal transmission line meets the specification, voltage compensation can be performed at the power supply end according to the feedback received received voltage, so that the power receiving end can receive the complete required power.

[0046] It should be understood that the examples and embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims.

[0047] While the forgoing has been in terms of preferred embodiments and illustrative examples, it will be apparent to those of ordinary skill in the art that many modifications, additions, substitutions and changes can be made to the examples and embodiments described without departing from the spirit and scope of the application. Accordingly, it is intended that the scope of the application be governed by the following claims.

Claims

1. An adaptive power delivery power setting and protection method, applicable to a power supply end, wherein the power supply end and a power receiving end are connected through a power and signal transmission line, characterized in that, The power supply end comprises: providing a corresponding output voltage and output current according to a power requirement transmitted from the power receiving end through the power supply and signal transmission line; receiving a feedback received voltage from the power receiving end through the power supply and signal transmission line at the power supply end; limiting the output current when the proportion of the output current and the received voltage exceeds a specification; and adjusting the output voltage according to the feedback received voltage when the proportion of the output current and the received voltage is within the specification.

2. The adaptive power transfer power setting and protection method of claim 1, wherein, The feedback received voltage from the power receiving end through the power supply and signal transmission line is obtained through a channel configuration signal line.

3. The adaptive power transfer power setting and protection method of claim 1, wherein, Further comprising: calculating an impedance of the power supply and signal transmission line according to the output current and the received voltage.

4. The adaptive power transfer power setting and protection method of claim 3, wherein, When the proportion of the output current and the received voltage exceeds the specification, limiting the output current, characterized in that it comprises: limiting the output current when the impedance exceeds the specification; wherein, when the proportion of the output current and the received voltage is within the specification, increasing the output voltage according to the feedback received voltage to perform voltage compensation, comprising: increasing the output voltage according to the feedback received voltage to perform the voltage compensation on the received voltage when the impedance is within the specification.

5. The adaptive power transfer power setting and protection method of claim 1, wherein, The corresponding output voltage provided according to the power requirement transmitted from the power receiving end through the power supply and signal transmission line is implemented by using a mobile terminal fusion fast charging technical specification protocol, wherein the feedback received voltage from the power receiving end through the power supply and signal transmission line is obtained through a general asynchronous transceiver transmission protocol.

6. A power supply system characterized by comprising: The power supply and signal transmission line comprises: a power supply and signal transmission line; a power receiving end coupled to one end of the power supply and signal transmission line for transmitting a power requirement through the power supply and signal transmission line; a power supply end coupled to the other end of the power supply and signal transmission line for determining the output voltage provided according to the received power requirement, wherein the power supply end detects the output current; wherein the power receiving end feeds back the received received voltage through the power supply and signal transmission line, the power supply end limits the output current when the proportion of the output current and the received voltage exceeds the specification, the power supply end increases the output voltage according to the feedback received voltage to perform voltage compensation on the received voltage when the proportion of the output current and the received voltage is within the specification.

7. The power supply system of claim 6, wherein, The power supply and signal transmission line comprises a channel configuration signal line, wherein the power receiving end feeds back the received voltage from the channel configuration signal line.

8. The power supply system of claim 6, wherein, The power supply end calculates an impedance of the power supply and signal transmission line according to the output current and the received voltage fed back by the power receiving end.

9. The power supply system of claim 8, wherein, The power supply end judges that the impedance exceeds the specification and limits the output current; The power supply end judges whether the impedance is within the specification, and improves the output voltage according to the difference between the received voltage and the output voltage to perform voltage compensation.

10. The power supply system of claim 6, wherein, The power supply receiving end transmits the power requirement through a mobile terminal fusion fast charging technical specification protocol, The power supply receiving end feeds back the received voltage from the power supply and the signal transmission line through a universal asynchronous receiving and transmitting protocol.

Images