TWI725570B - Universal serial bus power-supplying apparatus with power-switching functions - Google Patents

Abstract

A universal serial bus power-supplying apparatus with power-switching functions includes a power convertor, a power delivery communication controller and a plurality of switch units. The power delivery communication controller calculates a first communication time between the universal serial bus power-supplying apparatus and a first electronic apparatus. The power delivery communication controller calculates a second communication time between the universal serial bus power-supplying apparatus and a second electronic apparatus. The universal serial bus power-supplying apparatus utilizes a time difference between the first communication time and the second communication time to switch the switch units to supply power to the first electronic apparatus and the second electronic apparatus.

Description

Universal serial bus power supply device with power switching function

The present invention relates to a universal serial bus power supply device, in particular to a universal serial bus power supply device with power switching function.

Type-C USB PD (power delivery) needs to support multiple outputs to power multiple electronic devices; when two or more electronic devices are connected to type-C USB PD, the fast charging voltage required by each electronic device may be different ( It may be 9, 12, 15 or 20 volts), and the communication time between the type-C USB PD and each electronic device (the communication content is: type-C USB PD can provide several voltages, and the required voltage of the electronic device Etc.) may also be different; therefore, a related technology type-C USB PD will contain many power converters to correspond to different power output ports and different electronic devices; however, because it contains many power converters , So the cost of this related technology type-C USB PD is very high.

Another related technology type-C USB PD only contains one power converter, but because the communication time between the type-C USB PD and each electronic device may be different, this type-C type-C only contains one power converter When USB PD is connected to two or more electronic devices, it will only output 5 volts to avoid possible damage to electronic devices that only require 5 volts; for example, one electronic device requires 9 volts, another electronic device only requires 5 volts. If the type-C USB PD outputs 9 volts, it will damage the electronic device that only requires 5 volts. In other words, for this type-C USB PD that contains only one power converter, even if two or more connected electronic devices require the same voltage other than 5 volts (for example, both require 9 volts), this It is a pity that all type-C USB PDs only output 5 volts.

In order to solve the above problems, the object of the present invention is to provide a universal serial bus power supply device with power switching function.

In order to achieve the above-mentioned object of the invention, the universal serial bus power supply device with power switching function of the present invention is applied to a first electronic device and a second electronic device. The universal serial bus power supply with power switching function is used for power supply. The device includes: a power converter; a power transmission communication controller electrically connected to the power converter; a first switch unit electrically connected to the power converter, The power transmission communication controller and the first electronic device; and a second switch unit which is electrically connected to the power converter, the power transmission communication controller and the second electronic device. The power transmission communication controller calculates a first communication time between the universal serial bus power supply device with power switching function and the first electronic device; the power transmission communication controller calculates the time between the power supply A second communication time between the universal serial bus power supply device with switching function and the second electronic device; the universal serial bus power supply device with power switching function utilizes the time between the first communication time and the second electronic device A time difference between the communication time is used to control the first switch unit or the second switch unit to supply power to the first electronic device and the second electronic device to drive the first electronic device and the second electronic device.

The effect of the present invention is to enable the universal serial bus power supply device to provide a voltage greater than 5 volts to more than two electronic devices, but only one power converter is required.

In order to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. I believe that the purpose, features and characteristics of the present invention can be obtained in depth and specificity. It is understood that, however, the accompanying drawings are only provided for reference and illustration, and are not intended to limit the present invention.

10: Universal serial bus power supply device with power switching function

20: The first electronic device

30: second electronic device

40: Power source

102: power converter

104: Power Delivery Communication Controller

108: memory unit

1061: The first switch unit

1062: The second switch unit

S02~26: steps

FIG. 1 is a block diagram of a universal serial bus power supply device with power switching function of the present invention.

2 is a timing diagram of an embodiment of the universal serial bus power supply device with power switching function of the present invention.

Fig. 3 is a flowchart of a method for applying the present invention to a universal serial bus power supply device with power switching function.

In this disclosure, many specific details are provided to provide a thorough understanding of the specific embodiments of the present invention; however, those skilled in the art should know that in the absence of one or more of these specific details, The present invention can be practiced; in other cases, well-known details are not shown or described in order to avoid obscuring the main technical features of the present invention. The technical content and detailed description of the present invention are described as follows in conjunction with the drawings: Please refer to FIG. 1, which is a block diagram of the universal serial bus power supply device with power switching function of the present invention. A universal serial bus power supply device with power switching function 10 (example If it is a type-C USB PD, it is applied to a first electronic device 20, a second electronic device 30 and a power source 40 (for example, AC power, DC power or battery, to supply power to the following power converter 102 ); The universal serial bus power supply device 10 with power switching function includes a power converter 102, a power transmission communication controller 104, a first switch unit 1061, a second switch unit 1062 and a memory unit 108; The above-mentioned elements are electrically connected to each other.

It should be noted that Figure 1 only includes two electronic devices (the first electronic device 20 and the second electronic device 30), but the actual application is not limited to this, and can include more than three electronic devices; Figure 1 only includes two switch units (The first switch unit 1061 and the second switch unit 1062), but the actual application is not limited to this, and can include more than three switch units. The power transmission communication controller 104 can control the power converter 102 to convert and output a 5, 9, 12, 15 or 20 volt DC voltage, and can control the first switch unit 1061 and the second switch unit 1062 to be on or Is not turned on to determine whether the voltage generated by the power converter 102 can be output to the corresponding electronic device, and the power transmission communication controller 104 can further control (switch) the first switch unit 1061 and the second switch unit 1062 Determine the voltage output to the first electronic device 20 and the second electronic device 30; for example, although the power converter 102 transmits a 9 volt DC voltage to the second switch unit 1062, the power transmission communication controller 104 can switch The second switch unit 1062 enables the second switch unit 1062 to output a 5 volt DC voltage to the second electronic device 30.

The main concept of the present invention is: the power transmission communication controller 104 calculates a first communication time between the universal serial bus power supply device 10 with power switching function and the first electronic device 20; the power transmission The communication controller 104 calculates a second communication time between the universal serial bus power supply device 10 with power switching function and the second electronic device 30; the universal serial bus power supply device with power switching function 10 Use a time difference between the first communication time and the second communication time to control (switch) the first switch unit 1061 or the second switch unit 1062 (to complete communication with the first electronic device 20 or the Communication between the second electronic device 30) to supply power to the first electronic device 20 and the second electronic device 30 to drive the first electronic device 20 and the second electronic device Set 30. The memory unit 108 is used to store the first communication time, the second communication time, and the time difference; the time difference is greater than 0 seconds.

The first communication time is defined as: from the universal serial bus power supply device 10 with power switching function sending a first initial communication signal, until the universal serial bus power supply device 10 with power switching function receives a Until the first demand signal. Wherein, the first initial communication signal sent by the universal serial bus power supply device 10 with power switching function is transmitted to the first electronic device 20, and the universal serial bus power supply device 10 with power switching function receives The received first demand signal is transmitted by the first electronic device 20, and the first demand signal is used to indicate the magnitude of the demand voltage of the first electronic device 20.

The second communication time is defined as: from the universal serial bus power supply device 10 with power switching function sending a second initial communication signal, until the universal serial bus power supply device 10 with power switching function receives Until a second demand signal. Wherein, the second initial communication signal sent by the universal serial bus power supply device 10 with power switching function is transmitted to the second electronic device 30, and the universal serial bus power supply device 10 with power switching function is The received second demand signal is transmitted by the second electronic device 30, and the second demand signal is used to indicate the magnitude of the demand voltage of the second electronic device 30.

Generally speaking, the initial situation of the present invention is as follows: first, the first electronic device 20 has been connected to the universal serial bus power supply device 10 with power switching function and the universal serial bus power supply with power switching function is powered The device 10 has supplied power to the first electronic device 20 to drive the first electronic device 20 (this means that the universal serial bus power supply device 10 with power switching function has completed the communication with the first electronic device 20 and it is known that The first demand signal and the first communication time). Then, if the second electronic device 30 is to be connected to the universal serial bus power supply device 10 with power switching function and after the second electronic device 30 is connected to the universal serial bus power supply device 10 with power switching function, Then the universal serial bus power supply device 10 with power switching function stops supplying power to the first power supply Sub-device 20, the universal serial bus power supply device 10 with power switching function communicates with the second electronic device 30, so that the power transmission communication controller 104 calculates between the universal serial bus with power switching function The second communication time between the power supply device 10 and the second electronic device 30 and the second demand signal and the second communication time are learned; then, the universal serial bus power supply device 10 with power switching function also Stop the communication with the second electronic device 30; after that, the present invention will first determine whether the magnitude of the demand voltage of the first electronic device 20 indicated by the first demand signal is equal to the magnitude of the demand voltage of the first electronic device 20 indicated by the second demand signal. The magnitude of the required voltage of the second electronic device 30; if the two are different, since there is only one power converter 102 in the present invention, the power converter 102 is used in the universal serial bus power supply device 10 with power switching function After the first electronic device 20 and the second electronic device 30 are re-powered and communicated again (because the aforementioned universal serial bus power supply device 10 with power switching function has stopped supplying power to the first electronic device 20, And the universal serial bus power supply device 10 with power switching function has also stopped communicating with the second electronic device 30, so it will communicate again after power-on again), it will only output 5 volts; but if If the two are the same, the present invention includes the following two situations, which are described in detail as follows:

1. If the second communication time is greater than the first communication time, then: the power transmission communication controller 104 subtracts the first communication time from the second communication time to obtain the time difference; the universal string with power switching function The serial bus power supply device 10 transmits the first initial communication signal to the first electronic device 20, and at the same time, the universal serial bus power supply device 10 with power switching function transmits the second initial communication signal to the second electronic device. Device 30; after the first communication time, the first electronic device 20 completes the communication with the universal serial bus power supply device 10 with power switching function, so the universal serial bus power supply device with power switching function 10 Output the demand voltage of the first electronic device 20 indicated by the first demand signal (equal to the demand voltage of the second electronic device 30 indicated by the second demand signal, such as 9 volts) to the first electronic device 20 (that is, the power delivery communication controller 104 controls the power converter 102 to convert and output the aforementioned 9 volt voltage to the first switch Unit 1061 and the second switch unit 1062; that is, at this time, the power transmission communication controller 104 completely turns on the first switch unit 1061 so that the 9 volt voltage generated by the power converter 102 is transmitted to the first Electronic device 20), but the power transmission communication controller 104 switches the second switch unit 1062 that receives the 9 volt voltage to convert the 9 volt voltage to output a 5 volt voltage to the second electronic device 30. The time difference (to maintain Communication with the second electronic device 30, because a voltage of 5 volts is required during the communication). After the time difference (representing that the second electronic device 30 has also completed the communication with the universal serial bus power supply device 10 with power switching function), the universal serial bus power supply device 10 with power switching function outputs the first The demand voltage of the second electronic device 30 indicated by the second demand signal (equal to the demand voltage of the first electronic device 20 indicated by the first demand signal, such as the aforementioned 9 volt voltage) to the second electronic device 30 (also That is, at this time, the power transmission communication controller 104 completely turns on the second switch unit 1062 so that the 9 volt voltage generated by the power converter 102 is transmitted to the second electronic device 30).

2. If the second communication time is not greater than the first communication time, then: the power transmission communication controller 104 subtracts the first communication time from the second communication time to obtain the time difference; the universal power switch function The serial bus power supply device 10 transmits the first initial communication signal to the first electronic device 20, and at the same time the universal serial bus power supply device 10 with power switching function transmits the second initial communication signal to the second electronic device 20 Electronic device 30; after the second communication time, the second electronic device 30 completes the communication with the universal serial bus power supply device 10 with power switching function, so the universal serial bus power supply with power switching function The device 10 outputs the demand voltage of the second electronic device 30 indicated by the second demand signal (equal to the demand voltage of the first electronic device 20 indicated by the first demand signal, such as 9 volts) to the second electronic device The device 30 (that is, the power transmission communication controller 104 controls the power converter 102 to convert and output the aforementioned 9 volt voltage to the first switching unit 1061 and the second switching unit 1062; that is, at this time, the power transmission The communication controller 104 completely turns on the second switch unit 1062 so that the aforementioned 9 volt voltage generated by the power converter 102 is transmitted To the second electronic device 30), but the power transmission communication controller 104 switches the first switch unit 1061 that receives the 9 volt voltage to convert the 9 volt voltage to output a 5 volt voltage to the first electronic device 20. Time difference (to maintain communication with the first electronic device 20, because a voltage of 5 volts is required during the communication). After the time difference (representing that the first electronic device 20 has also completed the communication with the universal serial bus power supply device 10 with power switching function), the universal serial bus power supply device 10 with power switching function outputs the second The demand voltage of the first electronic device 20 indicated by a demand signal (equal to the demand voltage of the second electronic device 30 indicated by the second demand signal, such as the aforementioned 9 volt voltage) to the first electronic device 20 (also That is, at this time, the power transmission communication controller 104 completely turns on the first switch unit 1061 so that the 9 volt voltage generated by the power converter 102 is transmitted to the first electronic device 20).

In other words, if the required voltage of the first electronic device 20 indicated by the first demand signal is equal to the required voltage of the second electronic device 30 indicated by the second demand signal (for example, the first The magnitude of the demand voltage of the first electronic device 20 indicated by the demand signal is, for example, 9 volts, that is, greater than 5 volts, which is equal to the magnitude of the demand voltage of the second electronic device 30 indicated by the second demand signal (9 volts), Then the universal serial bus power supply device 10 with power switching function utilizes the above-mentioned conditions to transmit the voltage of the magnitude of the required voltage of the first electronic device 20 indicated by the first demand signal to the first electronic device 20 and The second electronic device 30 drives the first electronic device 20 and the second electronic device 30.

Please refer to FIG. 2, which is a timing diagram of an embodiment of the universal serial bus power supply device with power switching function of the present invention; please also refer to FIG. 1; FIG. 2 is based on the second communication time being greater than the first Take a communication time as an example. In Figure 2, the first waveform from top to bottom represents that the first electronic device 20 is separately connected to the universal serial bus power supply device. It can be seen that the first electronic device 20 and the universal serial bus power supply device The first communication time is 100ms (150ms-50ms=100ms), and the required voltage of the first electronic device 20 is 9 volts. The second waveform from top to bottom represents the second electronic device 30 is separately connected to the universal serial bus power supply device, it can be seen that the second communication time between the second electronic device 30 and the universal serial bus power supply device is 150ms (200ms-50ms=150ms), and the second electronic The required voltage of the device 30 is 9 volts. The third waveform from top to bottom represents the timing of the first electronic device 20 and the universal serial bus power supply device after power-on again. The fourth waveform from top to bottom represents the timing between the second electronic device 30 and the universal serial bus power supply device after power-on again; after the first communication time, the power transmission communication controller 104 switches the second The switch unit 1062 outputs a voltage of 5 volts to the second electronic device 30 for the time difference (maintained for 50 ms to maintain communication with the second electronic device 30). Therefore, the universal serial bus power supply device 10 with power switching function can provide the same voltage (for example, 9 volts) of the two electronic devices.

Please refer to FIG. 3, which is a flowchart of a method for applying the present invention to a universal serial bus power supply device with power switching function, which can also be referred to as a power supply method for a universal serial bus power supply device with power switching function; Please also refer to Figure 1. The power supply method of the universal serial bus power supply device with power switching function includes the following steps:

Step S02: Connect the first electronic device 20. That is, the first electronic device 20 is connected to the universal serial bus power supply device 10 with power switching function; then, step S04 is entered.

Step S04: Communicate. That is, the universal serial bus power supply device 10 with power switching function (output 5 volts) communicates with the first electronic device 20, so that the universal serial bus power supply device 10 with power switching function knows the The first demand signal and the first communication time; then go to step S06.

Step S06: Supply power to the first electronic device 20. That is, the universal serial bus power supply device 10 with power switching function supplies power to the first electronic device 20 to drive the first electronic device 20 according to the magnitude of the demand voltage of the first electronic device 20 indicated by the first demand signal Electronic device 20; then enter step S08.

Step S08: Detect whether the second electronic device 30 is inserted. That is, the universal serial bus power supply device 10 with power switching function detects whether the second electronic device 30 is inserted into the universal serial bus power supply device 10 with power switching function. If no (the second electronic device 30 is not plugged in), go back to step S06; if yes (the second electronic device 30 is plugged in), go to step S10.

Step S10: The first electronic device 20 is powered off, and the second electronic device 30 communicates. That is, the universal serial bus power supply device 10 with power switching function stops supplying power to the first electronic device 20 according to the magnitude of the demand voltage of the first electronic device 20 indicated by the first demand signal, and the device has The universal serial bus power supply device 10 with power switching function (output 5 volts) communicates with the second electronic device 30, so that the universal serial bus power supply device 10 with power switching function knows the second demand signal and The second communication time; then go to step S12.

Step S12: the second electronic device 30 is powered off. That is, the universal serial bus power supply device 10 with power switching function stops the communication with the second electronic device 30; then, step S14 is entered.

Step S14: Whether the demand voltages are the same. That is, the universal serial bus power supply device 10 with power switching function determines whether the required voltage of the first electronic device 20 indicated by the first demand signal is equal to the second demand signal indicated by the second demand signal. The magnitude of the required voltage of the electronic device 30; if the two are different, go to step S16; if the two are the same, go to step S18.

Step S16: Output a voltage of 5 volts. That is, after the power is turned on again, it will communicate again, and after the communication is completed again, the universal serial bus power supply device 10 with power switching function will only output a voltage of 5 volts.

Step S18: Determine whether the second communication time is greater than the first communication time; if yes, go to step S20; if not, go to step S24. At this time, the present invention also subtracts the first communication time from the second communication time to obtain the time difference.

Step S20: The first electronic device 20 and the second electronic device 30 are simultaneously powered on; after the first communication time, the power transmission communication controller 104 switches the second switch unit 1062 to output a voltage of 5 volts to the first The time difference between the two electronic devices 30. That is, the universal serial bus power supply device 10 with power switching function transmits the first initial communication signal to the first electronic device 20, and at the same time, the universal serial bus power supply device 10 with power switching function transmits the The second initial communication signal is sent to the second electronic device 30; after the first communication time, the first electronic device 20 completes the communication with the universal serial bus power supply device 10 with power switching function, so it has The universal serial bus power supply device 10 with power switching function outputs the demand voltage of the first electronic device 20 indicated by the first demand signal (equal to the demand voltage of the second electronic device 30 indicated by the second demand signal) To the first electronic device 20, but the power transmission communication controller 104 switches the second switch unit 1062 to output a voltage of 5 volts to the second electronic device 30 for the time difference (to maintain communication with the second electronic device 30) ; Please refer to FIG. 2 again, that is, the power transmission communication controller 104 switches the second switch unit 1062 to output a voltage of 5 volts (maintain 50ms) to the second electronic device 30 (to maintain the second electronic device 30 Communication). Then, it progresses to step S22.

Step S22: After the time difference has elapsed, the universal serial bus power supply device 10 with power switching function outputs the demand voltage of the second electronic device 30 indicated by the second demand signal to the second electronic device 30. That is, after the time difference, the second electronic device 30 also completes the communication with the universal serial bus power supply device 10 with power switching function, so the universal serial bus power supply device 10 with power switching function outputs The demand voltage of the second electronic device 30 indicated by the second demand signal (equal to the demand voltage of the first electronic device 20 indicated by the first demand signal) to the second electronic device 30.

Step S24: the first electronic device 20 and the second electronic device 30 are simultaneously powered on; after the second communication time, the power transmission communication controller 104 switches the first switch unit 1061 to output a voltage of 5 volts to the first An electronic device 20 has the time difference. That is, the communication with power switching function The serial bus power supply device 10 is used to transmit the first initial communication signal to the first electronic device 20, and at the same time, the universal serial bus power supply device 10 with power switching function transmits the second initial communication signal to the first electronic device 20. Two electronic devices 30; after the second communication time, the second electronic device 30 completes the communication with the universal serial bus power supply device 10 with power switching function, so the universal serial bus with power switching function The power supply device 10 outputs the demand voltage of the second electronic device 30 indicated by the second demand signal (equal to the demand voltage of the first electronic device 20 indicated by the first demand signal) to the second electronic device 30, but The power transmission communication controller 104 switches the first switch unit 1061 to output a voltage of 5 volts to the first electronic device 20 for the time difference (to maintain communication with the first electronic device 20). Then, it progresses to step S26.

Step S26: After the time difference has elapsed, the universal serial bus power supply device 10 with power switching function outputs the demand voltage of the first electronic device 20 indicated by the first demand signal to the first electronic device 20. That is, after the time difference, the first electronic device 20 also completes the communication with the universal serial bus power supply device 10 with power switching function, so the universal serial bus power supply device 10 with power switching function outputs The demand voltage of the first electronic device 20 indicated by the first demand signal (equal to the demand voltage of the second electronic device 30 indicated by the second demand signal) to the first electronic device 20.

The effect of the present invention is to enable the universal serial bus power supply device to provide a voltage greater than 5 volts to more than two electronic devices, but only one power converter is required. Furthermore, in a specific embodiment of the present invention, the aforementioned "determine whether the required voltage of the first electronic device 20 indicated by the first demand signal is equal to the second electronic device indicated by the second demand signal) The meaning of "the magnitude of the required voltage of 30" is: to determine the maximum same value among the types of required voltages of the first electronic device 20 and the types of required voltages of the second electronic device 30; the aforementioned "if the two are different" The meaning of is: among the types of required voltages of the first electronic device 20 and the types of required voltages of the second electronic device 30, the maximum same value is only 5 volts; the aforementioned meaning of "if the two are the same" It means that the maximum same value among the required voltage types of the first electronic device 20 and the required voltage types of the second electronic device 30 is greater than 5 volts (for example, 9 volts). For example, the demand voltage of the first electronic device 20 is only 5 volts, and the demand voltage of the second electronic device 30 is 5 volts and 9 volts. The maximum identical value among the types of required voltages of the device 30 is only 5 volts, so this situation is regarded as the aforementioned "if the two are different". For another example, the required voltage of the first electronic device 20 is 5 volts, 9 volts, and 12 volts, the required voltage of the second electronic device 30 is 5 volts and 9 volts, and the type of the required voltage of the first electronic device 20 The maximum same value among the types of the required voltages of the second electronic device 30 is 9 volts (greater than 5 volts), so this situation is regarded as the aforementioned "if the two are the same."

However, the above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, all equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should still be covered by the patent of the present invention. Scope The scope of the intended protection. The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications are all It should belong to the protection scope of the attached patent application of the present invention. In summary, when it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and publicly used, it fully complies with the requirements of an invention patent application, and the application is filed in accordance with the Patent Law.

10: Universal serial bus power supply device with power switching function

20: The first electronic device

30: second electronic device

40: Power source

102: power converter

104: Power Delivery Communication Controller

108: memory unit

1061: The first switch unit

1062: The second switch unit

Claims (9)

A universal serial bus power supply device with power switching function is applied to a first electronic device and a second electronic device. The universal serial bus power supply device with power switching function includes: a power converter; A power transmission communication controller, the power transmission communication controller is electrically connected to the power converter; a first switch unit, the first switch unit is electrically connected to the power converter, the power transmission communication controller and the second An electronic device; a second switch unit which is electrically connected to the power converter, the power transmission communication controller and the second electronic device; and a memory unit which is electrically connected to the A power transmission communication controller, wherein the power transmission communication controller calculates a first communication time between the universal serial bus power supply device with power switching function and the first electronic device; the power transmission communication controller Calculate a second communication time between the universal serial bus power supply device with power switching function and the second electronic device; the universal serial bus power supply device with power switching function uses the power supply device between the first A time difference between the communication time and the second communication time is used to control the first switch unit or the second switch unit to supply power to the first electronic device and the second electronic device to drive the first electronic device and the second electronic device Two electronic devices; the power transmission communication controller controls the power converter to convert and output a DC voltage; the memory unit is used to store the first communication time, the second communication time and the time difference; the time difference is greater than 0 seconds. The universal serial bus power supply device with power switching function as described in item 1 of the scope of patent application, wherein the first communication time is defined as: a first time is sent from the universal serial bus power supply device with power switching function From the beginning of the communication signal until the universal The serial bus power supply device receives a first demand signal; wherein the first initial communication signal sent by the universal serial bus power supply device with power switching function is transmitted to the first electronic device, which has power switching The first demand signal received by the functional universal serial bus power supply device is transmitted by the first electronic device, and the first demand signal is used to indicate the magnitude of the demand voltage of the first electronic device. The universal serial bus power supply device with power switching function as described in item 2 of the scope of patent application, wherein the second communication time is defined as: a second communication time is sent from the universal serial bus power supply device with power switching function Starting from the initial communication signal, until the universal serial bus power supply device with power switching function receives a second demand signal; wherein the second start sent by the universal serial bus power supply device with power switching function The communication signal is transmitted to the second electronic device, the second demand signal received by the universal serial bus power supply device with power switching function is transmitted by the second electronic device, and the second demand signal is It is used to indicate the magnitude of the required voltage of the second electronic device. The universal serial bus power supply device with power switching function as described in item 3 of the scope of patent application, wherein the magnitude of the demand voltage of the first electronic device indicated by the first demand signal is equal to that indicated by the second demand signal The magnitude of the required voltage of the second electronic device, and the magnitude of the required voltage of the first electronic device indicated by the first demand signal is greater than 5 volts. The universal serial bus power supply device with power switching function as described in item 4 of the scope of patent application, wherein when the first electronic device has been connected to the universal serial bus power supply device with power switching function and the power supply When the universal serial bus power supply device with switching function has supplied power to the first electronic device to drive the first electronic device: if the second electronic device is to be connected to the universal serial bus power supply device with power switching function and is After the second electronic device is connected to the universal serial bus power supply device with power switching function, the universal serial bus power supply device with power switching function stops supplying power to the first electronic device, so that the power transmission communication control Calculator After the second communication time between the universal serial bus power supply device with power switching function and the second electronic device, after that, the universal serial bus power supply device with power switching function stops communicating with the second electronic device. Communication between devices. For example, the universal serial bus power supply device with power switching function described in item 5 of the scope of patent application, wherein if the second communication time is greater than the first communication time, then: the power transmission communication controller performs the second communication The first communication time is subtracted from the time to obtain the time difference; the universal serial bus power supply device with power switching function transmits the first initial communication signal to the first electronic device, and at the same time, the universal serial bus with power switching function The bus-bar power supply device transmits the second initial communication signal to the second electronic device; after the first communication time, the power transmission communication controller switches the second switch unit to output a voltage of 5 volts to the second electronic device Device this time difference. The universal serial bus power supply device with power switching function as described in item 6 of the scope of patent application, wherein after the first communication time, the universal serial bus power supply device with power switching function outputs the first demand The required voltage of the first electronic device indicated by the signal reaches the first electronic device; after the time difference, the universal serial bus power supply device with power switching function outputs the second electronic device indicated by the second demand signal The demand voltage of the device reaches the second electronic device. For example, the universal serial bus power supply device with power switching function described in item 5 of the scope of patent application, wherein if the second communication time is not greater than the first communication time, then: the power transmission communication controller performs the first communication time The communication time is subtracted from the second communication time to obtain the time difference; the universal serial bus power supply device with power switching function transmits the first initial communication signal to the first electronic device, and at the same time, the universal serial bus power supply device with power switching function The serial bus power supply device transmits the second initial communication signal to the second electronic device; after the second communication time, the power transmission communication controller switches the first switch unit to output a voltage of 5 volts to the first The time difference of the electronic device. The universal serial bus power supply device with power switching function as described in item 8 of the scope of patent application, wherein after the second communication time, the universal serial bus power supply device with power switching function outputs the second demand The demand voltage of the second electronic device indicated by the signal reaches the second electronic device; after the time difference, the universal serial bus power supply device with power switching function outputs the first electronic device indicated by the first demand signal The demand voltage of the device reaches the first electronic device.

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