JP7384469B2 - Control method for USB cable and power supply device - Google Patents

Description

The present invention relates to a USB (Universal Serial Bus) cable and a method of controlling a power supply device. In particular, a USB cable and a power supply device using such a USB cable that can easily wake the power supply device from the sleep state and put the power supply device into the power supply state even when the USB cable is not inserted or removed. The present invention relates to a control method.

In recent years, power has been supplied to electronic devices from power supply devices such as portable batteries via USB cables, but as electronic devices become more sophisticated, the power consumption required to drive electronic devices has dramatically increased. It has increased.
Under these circumstances, Type-C standard USB cables (hereinafter sometimes referred to as Type-C cables), which can supply large amounts of power, are beginning to attract attention.
The reason for this is that by using a Type-C cable, in addition to being more versatile with the unified connector (USB connector) that USB cables before the Type-C standard had, it also increases the power supply (maximum 5A, 48V). ), reduced heat loss, and expanded applications due to an increase in the number of terminals of the connector (24 pins), which can provide further convenience.

On the other hand, with the increase in the amount of power that can be supplied with Type-C cables, when a switch is provided on the power line, problems such as heat generation due to contact resistance may occur.
Furthermore, if the power supply device enters a sleep state because the current supplied to the power line is less than a predetermined value for a certain period of time or more, the power supply cannot be resumed even if a switch installed on the power line is operated. There was a case.
Therefore, in order to restart power supply, it was necessary to unplug the USB cable and plug it in again. Various techniques have been proposed to solve this problem.

As an example, a cable equivalent to a Type-C cable is disclosed that can stop power supply from a power supply device using a switch section provided in a communication line (see Patent Document 1).
More specifically, as shown in FIG. 12, a first connector 301, a second connector 302, a first power line 312 for power supply, a communication line 313, and a The cable 300 includes a control section 303, a switch 304 provided on a communication line, a first temperature detection section 308 capable of detecting the temperature around the first connector 301, and the like.
The control unit 303 performs communication between the power supply device and the electronic device so that power is not supplied via the first power line 312 when the first temperature becomes equal to or higher than a predetermined temperature. This is a configuration in which the line 313 is disconnected.

JP 2021-89604 (claims, drawings, etc.)

However, the cable disclosed in Patent Document 1 is an invention of a safety device in case the temperature of the first connector becomes excessively high, and although the power supply can be stopped, it is not possible to cancel the sleep state. I had to reconnect the cable once.
That is, there is a problem in that it is difficult to cancel the sleep state of the power supply device and restart power supply when the cable is not connected or disconnected.

As a result of intensive study, the inventors of the present invention discovered that by providing a predetermined switch section on the USB cable, it is possible to switch between the connected state and the disconnected state of the USB cable, and completed the present invention. This is what I did.
That is, according to the present invention, it is an object of the present invention to provide a USB cable that can easily cancel the sleep state of a power supply device and put the power supply device into a power supply state.
Another invention of the present invention is a method of controlling a power supply device for easy and stable power supply using such a USB cable.

According to the present invention, the first connector is connected to a power supply device and has at least a VBUS terminal, a GND terminal, and a CC (Configuration Channel) terminal, and the second connector is connected to an electronic device to which power from the power supply device is supplied. A USB cable equipped with a connector, characterized in that it includes a switch section that switches the USB cable from a disconnected state to a connected state to a power supply device, and cancels the sleep state of the power supply device. Such a USB cable is provided to solve the above-mentioned problems.
With this configuration, even if the USB cable is not inserted or removed, the USB cable can be easily temporarily disconnected and then connected again.
Therefore, the sleep state of the power supply device can be canceled and the power supply device can be brought into the power supply state.

Further, in configuring the USB cable of the present invention, it is preferable that the switch section is provided between at least one of the CC terminal or the GND terminal and the ground section.
With this configuration, the power applied to the switch section remains constant regardless of the power supplied to the VBUS terminal, so it is possible to more stably release the power supply device from the sleep state and return the power supply device to the power supply state. can do.

Further, in configuring the USB cable of the present invention, it is preferable that the switch section has a predetermined pull-down resistor between the CC terminal and the ground section.
With this configuration, the USB cable can be used even if it does not have a circuit for transmitting a signal for controlling the power supply device to the CC terminal, thereby improving the versatility of the USB cable.

Further, in configuring the USB cable of the present invention, it is preferable that the switch section has a power supply condition generating circuit that causes the power supply device to supply a predetermined power based on the USB quick charging standard.
With this configuration, it is possible to output power that meets the quick charging standard to the power supply device, thereby further improving the versatility of the USB cable.

Further, in configuring the USB cable of the present invention, it is preferable that the switch section has a variable resistance section that switches between at least two different resistance values.
With this configuration, it is possible to switch the two resistance values (combined resistance value) according to the specifications of the power supply device, and indirectly control the potential of the CC terminal within the desired range, thereby controlling the USB cable. The connected state and non-connected state can be changed more easily and accurately.
Therefore, it is possible to more effectively prevent false detection due to measurement error, failure due to overcurrent, etc. when switching between the connected state and the disconnected state of the USB cable.

Further, in configuring the USB cable of the present invention, when the power supply device is the first power supply device, the switch section includes a second power supply device that supplies power to the switch section, which is different from the first power supply device. It is preferable to have the following.
With this configuration, the switch section can be stably driven regardless of whether the first power supply device is in a power supply state or a non-power supply state, and in turn, the sleep state of the power supply device can be more easily canceled. , the power supply device can be brought into a power supply state.

In configuring the USB cable of the present invention, it is preferable to include a drive section for switching the switch section.
With this configuration, the operation of the switch section can be made highly functional, and the switch section can be driven even at a remote location by, for example, wireless communication.
Therefore, it is possible to more easily cancel the sleep state of the power supply device and put the power supply device into the power supply state.

このように構成することにより、給電装置を効率的にスリープ状態として無駄な電力消費を防ぐことができる。 In configuring the USB cable of the present invention, the switch section sets the time for the power supply device to transition to the sleep state as T _S (seconds), turns the switch section from an ON state to an OFF state, and then turns it back on. It is preferable that the following relational expression (1) is satisfied, where the time until T ₀ (seconds) is taken.

With this configuration, it is possible to efficiently put the power supply device into a sleep state and prevent wasteful power consumption.

In configuring the USB cable of the present invention, it is preferable to provide a protection section between the VBUS terminal and the electronic device to prevent at least reverse current flow or overcurrent.
With this configuration, when electromotive force is generated in the electronic device or when the electronic device is short-circuited, backflow to the power supply device and overcurrent can be effectively prevented.
Therefore, since the USB cable can be used regardless of the type of electronic device to which power is supplied, the versatility of the USB cable can be further improved.

Another aspect of the present invention includes a first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, and a second connector connected to an electronic device to which power from the power supply device is supplied. , a switch unit, and a USB cable, the method includes the following steps (1) to (3).
(1) Connecting the first connector to the power supply device and connecting the second connector to the electronic device. (2) Turning off the switch, disconnecting the USB cable, and putting the power supply device into sleep mode. Step (3) Switching the switch part to the ON state, connecting the USB cable, and canceling the sleep state of the power supply device By performing this step, even if the USB cable is not inserted or removed, Also, the USB cable can be temporarily disconnected and then connected again.
Therefore, it is possible to easily and stably cancel the sleep state of the power supply device and put the power supply device into the power supply state.

FIG. 1 is a block diagram provided to explain the outline of the USB cable of the present invention and its relationship with a power supply device and electronic equipment. FIGS. 2(a) and 2(b) are perspective views provided to explain an example of the shape of the USB cable of the present invention. FIG. 3 is a block diagram used to explain a USB cable according to configuration example 1 of the present invention. FIGS. 4(a) to 4(b) are block diagrams for explaining a more specific configuration of a USB cable according to configuration example 1 of the present invention. FIGS. 5(a) to 5(c) are block diagrams for explaining USB cables according to configuration examples 2 to 4 of the present invention. FIG. 6 is a block diagram for explaining a USB cable according to configuration example 5 of the present invention. FIG. 7 is a block diagram for explaining a USB cable according to configuration example 6 of the present invention. FIG. 8 is a block diagram for explaining a USB cable having another configuration of the present invention. FIGS. 9(a) to 9(b) are block diagrams provided to explain a USB cable having a variable resistance section of the present invention. FIG. 10 is a flowchart provided to explain an example of the operation of the USB cable of the present invention. FIG. 11(a) is a timing chart for explaining an example of the operation of the USB cable of the present invention, and FIG. 11(b) is a timing chart for explaining an example of the operation of the USB cable of the present invention. FIG. 3 is a timing chart diagram for explaining an example of the operation. FIG. 12 is a diagram for explaining a USB cable as a conventional USB cable.

Embodiments of the present invention will be described below with appropriate reference to the drawings.
Moreover, in each figure used for explanation, the same component is shown with the same reference numeral, and its explanation may be omitted.
The drawings used in the explanation are schematic illustrations to the extent that these inventions can be understood, and the devices, shapes, dimensions, materials, etc. used in the explanation are preferred examples within the scope of the invention. Only. Therefore, the present invention is not limited to the following embodiments without particular reason.

[First embodiment]
As illustrated in FIG. 1, the USB cable of the first embodiment includes a first connector 11 connected to the power supply device 100 and having at least a VBUS terminal 11a, a GND terminal 11b, and a CC terminal 11c, and a first connector 11 connected to the power supply device 100. a second connector connected to an electronic device 200 to which power is supplied from the USB cable 10, the USB cable 10 can be changed from an unconnected state to a connected state when the power supply device 100 is put into a sleep state. The power supply device 100 is characterized in that it includes a switch section 18 that switches the power supply device 100 to cancel the sleep state of the power supply device 100.
Hereinafter, the USB cable of the first embodiment will be specifically explained by dividing it into each component including a power supply device and an electronic device connected to the USB cable, with appropriate reference to the drawings.
Note that the USB cable of the present invention includes a cable-type circuit configuration (see FIG. 2(a)) that exhibits the same function as the USB cable, a circuit board (see FIG. 2(b)), and a similar circuit structure for electronic equipment. It also includes a circuit configuration that supplies power from a power supply device to an electronic device, such as a built-in circuit module (not shown).

1. Power Supply Device The power supply device is a device connected to the first connector of the USB cable, and is a device that outputs predetermined power to an electronic device, which will be described later, via the USB cable.
Further, when no power is being supplied from the power supply device, it is preferable to turn off the power supply to the power supply device and put it into a sleep state.
The reason for this is that the power consumption of the power supply device can be suppressed and the power supply time can be effectively extended.

Further, it is preferable that the power supply device has a charging function of 3.6 to 48V that complies with the USB Type-C standard.
Specifically, although not particularly shown, the power supply device includes a voltage detection unit that measures the potential of the CC terminal, a pull-up resistor that controls the potential applied to the CC terminal, and a supply control unit that controls the supplied power. It is preferable to have.

In addition, power supply devices include AC adapters that are connected to an AC 100V outlet, portable batteries using lithium batteries or gallium nitride batteries, automobile batteries, fuel cells, solar power generation devices, wind power generation devices, etc. It is preferable that there be.
The reason for this is that such a power supply device can suitably receive power supply condition information from a power supply condition generation circuit, which will be described later, and output a predetermined amount of power based on the power supply condition information. This is because malfunctions can be more effectively prevented.

In addition, the sleep state is when the current supplied by the power supply device to the VBUS terminal falls below a preset reference value for a certain period of time, the power supply device recognizes that there is no power supply, and the power supply from the power device stops. This is the state where power supply is stopped.
Specifically, the time when the current falls below the reference value and the power supply device enters a sleep state is preferably within a range of 1 to 300 seconds.
The reason for this is that with such a time, the power consumption of the power supply device can be more effectively suppressed, and the power supply time can be effectively lengthened.
Therefore, the time for entering the sleep state is preferably a value within the range of 5 to 60 seconds, and even more preferably a value within the range of 10 to 30 seconds.

Further, it is preferable that the reference value of the current for entering the sleep state is a value within the range of 1 to 500 mA.
The reason for this is that with such a current, it is possible to more effectively determine the stop state of power supply, and it is possible to effectively lengthen the power supply time.
Therefore, the reference value of the current for entering the sleep state is preferably a value within the range of 10 to 300 mA, and even more preferably a value within the range of 50 to 150 mA.

In addition, the power supply device must be configured to measure the potential of the CC terminal, recognize the connection of the USB cable, and cancel the sleep state based on the potential change when the USB cable is removed and reinserted. is preferred.
In other words, the voltage detection section of the power supply device measures the potential of the CC terminal, and the CC terminal is connected to the ground section (internal terminal of the USB cable at ground potential) via a circuit element having a predetermined resistance value. It is preferable to determine that the USB cable is connected when this is indirectly detected.
The reason for this is that with such a configuration, it is possible to more easily detect the connected state and disconnected state of the USB cable, and more quickly cancel the sleep state.

Specifically, the resistance value (hereinafter sometimes referred to as connection resistance value) between the CC terminal and the grounding portion that is recognized by the voltage detection unit as being connected to the power supply device and the USB cable. ) is preferably 1.2 kΩ or more.
The reason for this is that by setting such a resistance value, the potential measured by the voltage detection section is stabilized, and false detection due to measurement errors can be more effectively prevented.
On the other hand, if the resistance value is excessively high, the potential change at the CC terminal will be excessively small and it will be susceptible to measurement errors, so it is better to set the connection resistance value within the range of 2 to 10 kΩ. Preferably, it is more preferably a value within the range of 3 to 6 kΩ.

On the other hand, the voltage detection unit recognizes that the power supply device and the USB cable are disconnected by setting the CC terminal to an open end or disconnecting the GND terminal from the grounding part. preferable.
The reason for this is that the power supply device can be easily released from the sleep state by the switch unit described later, and even with a simpler configuration, the power supply device can be brought into the power supply state.

In addition, as another aspect, the voltage detection unit recognizes that the power supply device and the USB cable are in a disconnected state (including a case where a USB cable is connected to the power supply device without connecting an electronic device). It is preferable that the resistance value between the CC terminal and the ground portion (hereinafter sometimes referred to as unconnected resistance value) be less than 1.2 kΩ.
The reason for this is that by setting such a resistance value, it is possible to more effectively prevent erroneous detection due to measurement error, failure due to overcurrent, etc. in the voltage detection section.
On the other hand, if the resistance value is too small, the change in the potential of the CC terminal will become excessively large, which can easily cause malfunctions, so it is better to set the value within the range of 0.5 to 1.18 kΩ. Preferably, it is more preferably a value within the range of 0.8 to 1.15 kΩ.

Further, the specific configuration of the voltage detection section is preferably a voltmeter IC, a wattmeter IC, or the like.
The reason for this is that with such a configuration, it is possible to more easily cancel the sleep state of the power supply device and put the power supply device into the power supply state using the switch unit described below.

2. Electronic Device The electronic device is a device that is connected to the second connector of the USB cable and driven by receiving predetermined power output from the power supply device.
Specifically, fans (including circulators), ventilation fans, heaters, coolers, vacuum cleaners, refrigerators, hot storages, notebook PCs, lights, displays, radios, televisions, ultrasonic transmitters, metal detectors, fish finders, Preferably, it is a portable game machine, a communication modem, a video disc player, an IC recorder, a measuring device, a laser oscillator, or the like.
The reason for this is that such electronic equipment can be more easily driven using a Type-C cable.
Further, the driving power of the electronic device is preferably within the range of 2.5 to 240W.
The reason for this is that with this kind of power consumption, it can be driven within the allowable power range of the Type-C cable, and there is no need for an additional booster circuit, making it easy to downsize the entire adapter. To become.
Therefore, it is more preferable that the power consumption of the electronic device to be driven is within the range of 5 to 150 W, and even more preferably within the range of 10 to 100 W.

3. First Connector The first connector has at least a VBUS terminal, a GND terminal, and a CC terminal, and is a connector for connecting to an opening of a power supply device.
Specifically, a Type-C standard plug or receptacle is preferable.
The reason for this is that the USB cable can be connected to the power supply device without using a conversion connector or the like, making it easier to downsize the entire USB cable.

4. Second Connector The second connector is a connector for connecting a power line that transmits power output from the power supply device to an electronic device.
Specifically, at least a DC round plug, a DC round jack, a DC square plug, a DC square jack, a cigarette plug, a cigarette jack, an audio stereo plug, an audio stereo jack, a board connection plug, a board connection jack, etc. Preferably one is used.
The reason for this is that such a connector has at least the terminals necessary for DC power supply, eliminating the need for additional terminals and making it easier to downsize the entire USB cable. It is.

5. Switch unit (1) Basic configuration The switch unit is a part that mutually switches the state of the USB cable to the power supply device between an electrically connected state and a non-connected state by switching between an ON state and an OFF state. , is the part that cancels the sleep state of the power supply device.
Specifically, it is a part that turns the switch section OFF to set the potential of the CC terminal to a value that deviates from the reference potential, and then turns the switch ON again to return the potential of the CC terminal to the reference potential.
Although the reference potential differs depending on the specifications of the power supply device, etc., the GND terminal is set to the ground potential, and the CC terminal is connected via a resistor (corresponding internal resistance in the case of an IC) within the range of the connection resistance value. It is preferable to use the potential when connected to the ground part.
The reason for this is that by using such a reference potential, it is possible to more easily create a USB cable that complies with the Type-C cable standard.

Further, it is preferable that the switch section is configured to be in an OFF state when the first connector is disconnected from the power supply device.
The reason for this is that it is possible to effectively prevent unintentional power supply by connecting the power supply device and the electronic device while the switch unit is in the ON state.

Regarding the arrangement of the switch section, it is preferable that the switch section is provided between at least one of the CC terminal or the GND terminal and the ground section.
The reason for this is that with this arrangement, by operating the switch part, the potential of the CC terminal can be changed indirectly, making it easier to switch between the connected state and the disconnected state of the USB cable. This is because it can be done.
Here, as shown in FIG. 1, the switch section 18 connected to the CC terminal 11c may be referred to as a first switch section 18a, and the switch section 18 connected to the GND terminal 11b may be referred to as a second switch section 18b.
Furthermore, as a switch section, a power supply condition generation circuit, which will be described later, is provided between the CC terminal and the grounding section, and a switch is provided in the power line that supplies power to the power supply condition generation circuit, and the first switch is also used. Sometimes referred to as a department.
This is because, with this configuration, the power supply condition generation circuit can be indirectly cut off and the same effect as when a switch section is disposed between the CC terminal and the ground section can be achieved.

Moreover, when the switch unit is the first power supply device, it is preferable that the switch unit is provided with a second power supply device that is different from the first power supply device and supplies power to the switch unit.
Specifically, the switch unit preferably includes a lithium ion battery, an alkaline button battery, an alkaline dry battery, a solar panel, a piezoelectric element, or the like as the second power supply device.
The reason for this is that when receiving power for driving the switch unit from the power supply device, it can be used as a power source that can supply power independently of the power supply device.

Moreover, it is preferable that the switch section has a drive section for controlling switching.
Specifically, the drive unit is a control device for controlling the drive of a switch unit, which will be described later, and is preferably configured with a microcomputer, a PLC, an electromagnetic relay, or the like.
Further, it is preferable that the driving section is driven based on signals output from a temperature sensor, a current sensor, a voltage sensor, a wireless communication IC, etc. attached to the driving section.
The reason for this is that even if the switch and the operating section are separated, a signal from a sensor, a wireless communication IC, etc. can be used as a trigger, and the degree of freedom in arranging the switch is improved.

Further, it is preferable that the switch section includes a switch for disconnecting the CC terminal or the GND terminal from the ground section, and a circuit element for causing the power supply device to recognize the connection of the USB cable. .
The reason for this is that with this configuration, the switch section and circuit elements can be changed according to the type of power supply device or electronic device, and the versatility of the USB cable can be further enhanced.

Further, it is preferable that the switch section includes a display section for externally displaying whether or not the power supply device is in a sleep state.
Specifically, a liquid crystal panel, an organic panel, an LED light, an electronic paper, etc. are preferable.
The reason for this is that with this configuration, the power supply state of the power supply device can be clarified, and forgetting to turn off the switch can be effectively prevented.

(2) Switching device It is preferable to use a contact switch or a non-contact switch as the type of switching device.
More specifically, the contact switch is preferably a rocker switch, push switch, tactile switch, slide switch, rotary switch, toggle switch, electromagnetic relay switch, jack switch, or the like.
The non-contact switch is preferably a MOSFET (metal-oxide-semiconductor field-effect transistor) switch, a solid-state switch, or the like.
The reason for this is that these types of switches are easy to obtain and assemble, and are easy to mass produce.

(3) Circuit element The circuit element 15 cooperates with the pull-up resistor 101 connected to the CC terminal (hereinafter, described as the CC1 terminal, although it is not limited to the CC1 terminal or the CC2 terminal) in the power supply device 100. This is a part that allows the power supply device 100 to recognize the connection of the USB cable 10 and/or the power supply conditions.
That is, it is preferable that the resistance value in the circuit element 15 is within the range of the connection resistance value.
A specific example of the circuit element 15 will be described below with reference to FIG. 3 and FIGS. 4(a) to 4(b).

(3)-1 Pull-down resistor specified by USB Type-C The USB Type-C standard specifies that a pull-down resistor be mounted on the CC terminal of the electronic device or cable connected to the power supply device.
As shown in FIG. 3, in the USB cable 10, a series circuit including a switch 17 and a pull-down resistor, which is a circuit element 15, is connected as a switch section 18 (first switch section 18a) between the CC1 terminal and the ground section. is provided.
Therefore, by turning on or off the switch 17 of the switch section 18, the pull-down resistor can be connected or disconnected to the CC1 terminal, and the USB cable 10 can be connected to or disconnected from the power supply device 100 without having to connect or disconnect the USB cable 10. Since it can be inserted and removed, the effects of the present invention can be obtained.

(3)-2 Power supply condition generation circuit The power supply condition generation circuit is a circuit that transmits a signal to the power supply device to instruct it to supply power according to the USB PD (USB Power Delivery) standard, which is a quick charging standard. It is.
That is, the power supply device 100 receives a signal indicating the power supply condition input from the CC terminal, and outputs power corresponding to the power supply condition to the VBUS terminal.
Specifically, as shown in FIG. 4(a), the USB cable 10b has a built-in power supply condition generation circuit (hereinafter referred to as the PD control unit 15b) that generates power supply conditions that comply with the USB PD standard. The configuration is such that a pulse train, which is an electrical signal according to desired power supply conditions, can be output to the power supply device 100 via the CC1 terminal.
More specifically, the PD control section 15b is configured by a microcomputer, an emulator IC, and the like.
However, in the USB cable 10b of this form, a switch section 18 (first switch section 18a) including a switch 17 is provided between the terminal that outputs the power supply condition signal of the PD control section 15b and the CC1 terminal. Therefore, by turning on or off the switch section 18 including the switch 17, the PD control section 15b can be switched to a connected state or a disconnected state to the CC1 terminal.
Then, when the PD control unit 15b and the CC1 terminal are in an unconnected state, the power supply device 100 recognizes that the USB cable 10b is not connected to the power supply device 100. Therefore, even if the USB cable 10b is not inserted or removed from the power supply device 100, it is possible to create a state in which the USB cable 10b is inserted or removed, so that the effects of the present invention can be obtained.

(3)-3 eM power supply condition generation circuit Here, the eMarker specification of the USB PD standard specifies that an eMarker chip is built into a USB cable connected to a power supply device and cable information is transmitted to the power supply device.
A circuit using such an eMarker chip can be used as a circuit element of the present invention.
Here, FIG. 4(b) is a block diagram showing a USB cable 10c according to an embodiment including an eM power supply condition generation circuit 15c which is a power supply condition generation circuit using an eMarker chip.
The power supply device 100 recognizes the power supply condition, that is, the cable information, input from the eM power supply condition generation circuit 15c via the CC1 terminal and the CC2 terminal, and outputs the power corresponding to this power supply condition to the VBUS terminal.
However, in the USB cable 10c of the present invention, a switch section 18 (first switch A section 18a) is provided. Therefore, by turning on and off the switch section 18 including the switch 17, the eM power supply condition generation circuit 15c can be switched between connected and disconnected states to the CC1 terminal.
When the eM power supply condition generation circuit 15c and the CC1 terminal are in an unconnected state, the power supply device 100 recognizes that the USB cable 10c is not connected to the power supply device 100. Therefore, even if the USB cable 10c is not inserted or removed from the power supply device 100, it is possible to create a state in which the USB cable 10c is inserted or removed, so that the effects of the present invention can be obtained.

(4) Variable Resistance Section The switch section preferably includes a variable resistance section 19a that switches between at least two different resistance values, as shown in FIG. 9(a).
Specifically, a circuit element 15 having a resistance value within the range of connection resistance values is connected between the CC terminal and the ground, and a switch 17 and a resistor 16a are connected in parallel to the circuit element 15. It is preferable that the combined resistance of the circuit element 15 and the resistor 16a is a non-connected resistance value.
That is, it is preferable that the power supply device 100 and the USB cable 10j be connected when the switch 17 is turned off, and disconnected when the switch 17 is turned on.
The reason for this is that with this configuration, the two resistance values can be switched according to the specifications of the power supply device, making it easier to change the connected state and disconnected state of the USB cable. This is because it can be done.
This is because erroneous detection due to measurement errors and failures due to overcurrent can be more effectively prevented.

Further, it is preferable that a jack switch type switch is provided as a switch for the variable resistance section.
Specifically, as shown in FIG. 9(b), when the second connector 13 and the electronic device 200 are in an unconnected state, the CC terminal and the ground portion are in a connected state (so-called normally closed state). It is preferable to have a variable resistance section 19a that disconnects the CC terminal and the ground section when the second connector 13 and the electronic device 200 are disconnected.
That is, in the switch 17a, when the second connector 13 is connected to the electronic device 200, the tip of the GND terminal is pushed up by the protrusion 202 provided on the electronic device 200, and the GND terminal and the CC terminal are switched. It is preferable that the structure is non-contact.
The reason for this is that with such a configuration, the power feeding device and the USB cable 10k can be more easily switched between a connected state and a non-connected state by inserting the second connector.
Note that here, the variable resistance section 19a is used alone as the first switch section 18a, but as another embodiment, it is also preferable to use a plurality of switch sections 18 in combination.

Although not shown in the drawings, at least two power supply devices, power supply device A and power supply device B, are connected in parallel, and when power supply by power supply device A stops, power supply by power supply device B is connected. It is preferable to adopt a configuration in which power is supplied.
Specifically, power supply device B is provided with a variable resistance section, and the CC terminal and grounding section of the variable resistance section are kept in a normally closed state, so that when power from power supply device A runs out, the CC terminal and , it is preferable to have a configuration in which power is supplied from the power supply device B while the power supply device B is in a disconnected state from the grounding portion.
The reason for this is that with such a configuration, for example, AC power can be supplied during normal times, and in an emergency such as a power outage, the power can be quickly switched to a portable battery.
Therefore, it is more preferable that the power supply device A is configured to normally supply power to the electronic device and charge the power supply device B.

6. Protective Unit Although not particularly shown, it is preferable to provide a protective unit between the VBUS terminal and the electronic device to prevent at least reverse current flow or overcurrent.
The reason for this is that when the electronic device is a fan, the fan may continue to rotate due to inertia even after the switch is turned off, generating electromotive force. This is because current may flow backward from the device to the power supply device.
This is also because an overcurrent may flow from the power supply device when the VBUS terminal of the second connector and the GND terminal of the second connector are short-circuited.
In other words, by providing the power line of the USB cable with a protection part, it is possible to effectively prevent damage to the USB cable and further prevent damage to the power supply device.
Specifically, it is preferable to use a PTC thermistor, a diode, or the like.

7. Operation Next, the operation of the USB cable of the present invention described above will be explained based on the flowchart of FIG. 10 and the timing chart of FIG. 11.
In the timing chart of FIG. 11, the operation of the USB cable of the present invention is compared with the operation of a conventional USB cable having a switch section provided on a power line.

(1) Flowchart 1
FIG. 10 shows a flow chart of the operation of the USB cable of the present invention.
Specifically, consider a flowchart when the power supply device is in a sleep state and the switch section of the USB cable is turned on in the initial state.
First, in step S1, the first connector of the USB cable of the present invention is connected to a power supply device, and the second connector of the USB cable is connected to an electronic device. At this time, the USB cable becomes connected, and the sleep state of the power supply device is temporarily released.
Next, in step S2, the switch portion of the USB cable is turned off, and immediately thereafter, in step S3, the USB cable is disconnected.
Next, in step S4, the power supply device is put into a sleep state after a time period T _S (seconds) during which the power supply device transitions to a sleep state has elapsed since the USB cable was disconnected.
Next, in step S5, the switch section of the USB cable is turned on, and immediately after that, in step S6, the USB cable is brought into a connected state.
Next, in step S7 immediately after step S6, the power supply device detects the connection state with the USB cable, the sleep state of the power supply device is canceled, and power supply is resumed.
By going through steps S1 to S7 described above, the USB cable of the present invention can control the non-power supply state and the power supply state of the power supply device without physically connecting or disconnecting the cable.

(2) Flowchart 2
Although not particularly shown, a flowchart will be considered in which the power supply device is in a sleep state and the switch section of the USB cable is turned off in the initial state.
First, as in Flowchart 1, in step S1, the first connector of the USB cable of the present invention is connected to a power supply device, and the second connector of the USB cable is connected to an electronic device.
Next, steps S2 to S4 are omitted, and in step S5, the switch section of the USB cable is turned on, and immediately thereafter, in step S6, the USB cable is connected.
Next, in step S7 immediately after step S6, the power supply device detects the connection state with the USB cable, the sleep state of the power supply device is canceled, and power supply is resumed.
Note that this flowchart is used when a non-contact switch is used.

(3) Timing Chart The characteristics of the operation of the USB cable of the present invention in the explanation of the flowchart of FIG. 10 above will be further explained using FIGS. 11(a) to (b).
That is, FIG. 11(a) shows a timing chart of the operation of the USB cable of the present invention, and FIG. 11(b) shows a timing chart of the operation of the conventional USB cable.
From FIGS. 11(a) and 11(b), it can be seen that the time T ₀ (seconds) required for both USB cables to turn the switch from the ON state to the OFF state and then turn it ON again is T ₁ (between t1 and t2), and if T ₁ <T _S , it is understood that power supply can be resumed by turning the switch section from an OFF state to an ON state.
On the other hand, if the time T ₀ (seconds) is T ₂ (between t3 and t4) and T ₂ ≧ _TS , then once the conventional USB cable enters the sleep state, power is not supplied to the control unit. Due to the configuration in which this is performed from the power supply device, it is not possible to cause a predetermined potential change to occur at the CC terminal even if the switch section is turned from an OFF state to an ON state.
That is, since the conventional USB cable cannot wake the power supply device from a sleep state or resume power supply, it is necessary to remove it from the power supply device and reinsert it again in order to resume power supply.
On the other hand, with the USB cable of the present invention, by turning the switch section from OFF to ON, a predetermined potential change is effectively caused to the CC terminal, and the power supply device goes into sleep mode. You can release the power and resume power supply.
Therefore, even if the power supply device goes into a sleep state due to frequent turning on and off of power to electronic equipment, it is advantageous in that power supply can be resumed more quickly by operating the switch section. It is.

8. Configuration example (1) Configuration example 1
As shown in FIG. 3, the USB cable of configuration example 1 of the present invention is connected to a first connector 11 connected to a Type-C power supply device 100 and an electronic device 200 that uses power from the power supply device 100. This is an example including a second connector 13.
Specifically, the USB cable 10 is connected to the CC terminal (CC1 terminal in the illustrated example) of the first connector 11 and cooperates with the pull-up resistor 101 in the power supply device 100 to connect the USB cable 10 to the power supply device 100. and/or a first switch section 18a including a circuit element 15 that recognizes the power supply condition, and a switch 17 that connects or disconnects the circuit element 15 and the CC terminal.

Here, although the external shape of the USB cable of the present invention is arbitrary, examples of the external shape of the USB cable are shown in FIGS. 2(a) and 2(b).
The USB cable 10' shown in FIG. 2(a) is an example of a cable type, and has a slide type switch or the like that can turn the wiring ON and OFF on the top surface of the approximately rectangular parallelepiped main body 10x made of resin and/or metal. A section 18' is provided, and circuit elements (not shown) are provided inside the main body 10x.
Predetermined cables 10y and 10z extend from the main body 10x in two directions, and a first connector 11' is provided at the tip of the cable 10y, and a second connector 13' is provided at the tip of the cable 10z.
Therefore, the shape of the main body 10x may be a rectangular parallelepiped, a cube, a cylinder, a disk, a plate, etc. which are longer than the shape shown in FIG. 2(a), or any other shape.
That is, based on the embodiment shown in FIG. 2(a), it is possible to further modify the embodiment to correspond to various uses and functions, and still obtain the effects of the present invention without connecting or disconnecting the USB cable to the power supply device. can.
Note that the shape, structure, and material of the main body 10x and the shape and structure of the switch portion 18' are not limited to the example shown in FIG. 2(a).

Further, the USB cable 10'' shown in FIG. 2(b) is an example of a circuit board type, and has a first connector 11'', a second connector 13'', and a resin circuit board 10w. In this configuration, circuit elements such as a switch section 18'' and a switch section 18'' are respectively provided.
In this case, in the case of a circuit board type embodiment, various elements such as known semiconductor elements, electronic elements, display elements, measurement elements, oscillation circuits, etc. can be easily mounted, and a solder-resistant layer can be provided to allow reflow mounting, etc. This makes it extremely easy to use, increasing versatility and manufacturing efficiency.
That is, based on the circuit board type embodiment shown in FIG. 2(b), the effects of the present invention can be obtained while further modifying the embodiment to correspond to various uses and functions.
Although not particularly shown in the drawings, the arrangement of various elements such as the first connector, the second connector, and the switch section is not limited to being fixed on the board, but may be drawn out from the board by wiring or the like. It also includes aspects where

(2) Configuration example 2
As shown in FIG. 5A, the USB cable 10d of configuration example 2 has a first connector 11 connected to a USB Type-C power supply device 100, and an electronic device 200 that uses power from the power supply device 100. The second connector 13 is connected to the second connector 13.
The PD control unit 15b is connected to the CC terminal of the first connector 11 and outputs the power supply conditions specified by the USB PD, and the GND terminal of the first connector 11 is connected or disconnected from the grounding part. This is an example including a switch section 18 (second switch section 18b) that includes a switch 17 that performs switching.
Therefore, by turning the switch section 18 ON or OFF, the GND terminal of the first connector 11 can be connected or disconnected from the ground section.
At this time, if the GND terminal of the first connector 11 is not connected to the ground, the PD control section 15b will not operate and the predetermined signal will not be output to the CC1 terminal. It is recognized that the USB cable 10d is not connected.
Therefore, even if the USB cable 10d is not inserted or removed from the power supply device 100, it is possible to create a state in which the USB cable 10d is inserted or removed, so that the effects of the present invention can be obtained.

(3) Configuration example 3
As shown in FIG. 5B, the USB cable 10e of configuration example 3 has a first connector 11 connected to a USB Type-C power supply device 100, and an electronic device 200 that uses power from the power supply device 100. The second connector 13 is connected to the second connector 13.
The pull-down resistor 15a is connected to the CC terminal of the first connector 11 and is specified by USB Type-C, and the pull-down resistor 15a is connected to the D+ terminal and D- terminal of the first connector 11 and is specified by USB QC. A switch including a power supply condition generation circuit (hereinafter sometimes abbreviated as QC control unit 15d) that outputs power supply conditions, and a switch 17 that connects or disconnects the GND terminal of the first connector 11 to the grounding part. This is an example including a section 18 (second switch section 18b).
In configuration example 3, the resistance value of the pull-down resistor is set to 5.1 kΩ, which is within the range of the connection resistance value.

Here, according to the power supply specifications stipulated by the USB QC standard, by supplying a pulse train consisting of a predetermined voltage and a predetermined period to the D+ terminal and the D- terminal, the power supply device 100 adjusts the power supply conditions corresponding to the pulse train. Supply power with. Further, pulse trains, that is, power supply conditions corresponding to a plurality of types of power supply conditions are defined.
Then, the QC control unit 15d outputs this pulse train to the D+ terminal and the D- terminal.
Specifically, in the circuit of configuration example 3 in FIG. 5(b), the QC control unit 15d includes a regulator IC 31 that constantizes the voltage output to the VBUS terminal to a predetermined voltage, a microcomputer 33, and a resistor ladder. The voltage dividing circuit 35 is configured to output a pulse train consisting of a predetermined voltage and a predetermined period to the D+ terminal and the D- terminal.

Therefore, if the GND terminal of the first connector is not connected to the ground, the QC control unit 15d will not operate and the predetermined potential will not be applied to the CC1 terminal. It is recognized that the cable 10e is not connected.
Therefore, even if the USB cable 10e is not inserted or removed from the power supply device 100, it is possible to create a state in which the USB cable 10e is inserted or removed, so that the effects of the present invention can be obtained.

(4) Configuration example 4
As shown in FIG. 5(c), the USB cable 10f of configuration example 4 connects the first connector 11 connected to the USB Type-C power supply device 100 and the electronic device that uses power from the power supply device 100. A second connector 13 to be connected is provided.
A power supply condition generation circuit (eM power supply condition generation circuit 15c) that is connected to the CC1 terminal and CC2 terminal of the first connector 11 and outputs the power supply conditions specified by the USB eMarker, and a GND terminal of the first connector 11 This is an example including a switch section 18 (second switch section 18b) having a switch 17 that connects or disconnects the terminal to the ground section.
That is, by turning on or off the switch section 18 having the switch 17, the GND terminal of the first connector 11 can be connected or disconnected from the ground section. With such a configuration, the eM power supply condition generation circuit 15c does not operate, and the predetermined signal is not output to the CC1 terminal, so the power supply device 100 recognizes that the USB cable 10f is not connected to the connector. Therefore, even if the USB cable 10f is not inserted into or removed from the power supply device 100, a state in which the USB cable 10f is inserted or removed can be created, so that the effects of the present invention can be obtained.

(5) Configuration example 5 and configuration example 6
Configuration examples 5 and 6 correspond to modifications of configuration examples 2 and 4, and as shown in FIGS. 6 and 7, between the GND of the power supply condition generation circuit and the GND of the first connector. This is an example in which a switch section is provided in the power supply line of each power supply condition generation circuit to connect or disconnect the power supply and the power supply condition generation circuit, instead of providing a switch section in the power supply condition generation circuit.

Specifically, as shown in FIG. 6, the USB cable 10g of configuration example 5 has a switch having a switch 17 in the line between the PD control unit 15b described above and the VBUS terminal corresponding to its power source. This is an example in which a section 18 (first switch section 18a) is provided.
As shown in FIG. 7, the USB cable 70 of configuration example 6 includes a switch section 18 (having a switch 17 in the line between the eM power supply condition generating circuit 15c described above and the VBUS terminal corresponding to its power supply). This device is characterized in that a first switch section 18a) is provided.

As shown in FIGS. 6 and 7, in the case of either the USB cable 10g or the USB cable 10h, when the switch unit 18 having the switch 17 is turned off, the power supply is not connected to the power supply condition generation circuit built in each. Therefore, since the power supply condition generation circuit does not operate, the power supply device 100 recognizes that the USB cable is not connected to the connector.
Therefore, even if the USB cable is not inserted or removed from the power supply device 100, it is possible to create a state in which the USB cable is inserted or removed, so that the effects of the present invention can be obtained.
Note that in the case of configurations such as Configuration Examples 5 and 6, it is preferable that a second power supply device is provided so that power can be supplied to the power supply condition generation circuit even when the power supply device is in a sleep state.

(6) Other configuration examples The present invention can also be applied to a USB cable in which a wake-up circuit is provided. FIG. 8A is a diagram showing an example thereof, and is a diagram showing an example in which a wake-up circuit 80 is provided in the USB cable 10b of Configuration Example 1.
The wake-up circuit 80 is provided within the USB cable 10 between the VBUS terminal and the GND terminal, and is composed of a switching circuit 81 and a microcomputer 83. The microcomputer 83 outputs drive pulses to the switching circuit 81 at predetermined intervals.
The switching circuit 81 is turned on for a predetermined period of time in response to this drive pulse, so that a predetermined current flows from the VBUS terminal to the GND terminal.
That is, since this predetermined current is set to be larger than the threshold current at which the power supply device 100 enters the sleep state, it is possible to effectively prevent the power supply device 100 from entering the sleep state.
On the other hand, with the USB cable of this configuration example, even if the power supply device stops unintentionally or the switch section is intentionally turned OFF and the power supply device goes into sleep mode, the USB cable can be connected or disconnected by operating the switch section. You can more quickly wake up from sleep mode and resume power supply without having to do anything.

The wake-up circuit may be built into the USB cable, but it is also preferable that the wake-up circuit be of a cartridge type that can be attached to and detached from the power line in parallel.
The reason for this is that the configuration of the wake-up circuit can be more easily changed in accordance with the specifications of the power supply device, electronic equipment, etc.

Further, in the USB cable of the present invention, it is also preferable that the switch section is turned on or off in response to a signal detected by a separately provided sensor.
FIG. 8(b) is a diagram showing an example, in which a separately provided sensor is used to turn on or off the switch section 18 (first switch section 18a) having the switch 17 of the USB cable 10 of configuration example 1. This is an example in which the detection is performed in response to the signal S detected by 90. The sensor 90 can be of various types depending on the purpose.
That is, switching between power feeding and non-feeding of the power feeding device 100 can be performed from the outside, and can be performed by controlling only the circuit element 15 that is unrelated to the rating of the electronic device 200.
Therefore, regardless of the rated voltage of the electronic device 200, the power feeding device 100 can be switched between feeding and non-feeding of power with a current that is required only to control the circuit element 15 and is relatively small compared to the supplied power.

[Second embodiment]
A method for controlling a power supply device according to a second embodiment includes a first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, and a first connector connected to an electronic device to which power from the power supply device is supplied. 1. A method for controlling a power supply device including a second connector, which is characterized by including the following steps (1) to (3).
(1) Connecting the first connector to the power supply device and connecting the second connector to the electronic device (2) Turning off the switch section, disconnecting the USB cable, and putting the power supply device into sleep mode (3) The process of turning on the switch part, connecting the USB cable, and canceling the sleep state of the power supply device

1. Process (1)
Step (1) is a step of connecting the first connector and the second connector to a power supply device and an electronic device, respectively.
Specifically, this is a step of connecting the VBUS terminal and GND terminal of the power supply device to the VBUS terminal and GND terminal of the electronic device, respectively.
At this time, the switch part of the USB cable may be in either an ON state or an OFF state, but it is preferable to connect it in an OFF state.
The reason for this is that by connecting the switch part of the cable in the OFF state, it is possible to effectively prevent the power supply device from unintentionally supplying power to the electronic device when connected. .

この理由は、給電装置を効率的にスリープ状態として無駄な電力消費を防ぐことができるためである。
従って、スイッチ部は、Ｔ₀≧２Ｔ_Sの関係式を満たすように駆動させることがより好ましく、Ｔ₀≧１０Ｔ_Sの関係式を満たすように駆動させることが更に好ましい。 2. Process (2)
Step (2) is a step of putting the power supply device into a sleep state.
Specifically, this is a step in which the power supply device and the electronic device are connected by a USB cable and the switch section is OFF for a period of time T _S (seconds) or more for the power supply device to enter a sleep state.
In other words, by disconnecting the USB cable from the power supply device, the power supply device recognizes that the USB cable is not inserted, and by maintaining this state for a predetermined period of time or more, the power supply device can easily enter a sleep state. Can be done.
At this time, if the time taken for the switch section to go from an ON state to an OFF state and then to an ON state again is _T0 , the switch section can be driven so as to satisfy the following relational expression (1). preferable.

The reason for this is that the power supply device can be efficiently put into a sleep state to prevent wasteful power consumption.
Therefore, it is more preferable to drive the switch unit so that the relational expression T ₀ ≧2T _S is satisfied, and it is even more preferable to drive the switch part so that the relational expression T ₀ ≧10T _S is satisfied.

3. Process (3)
Step (3) is a step of canceling the sleep state of the power supply device and supplying power from the power supply device.
Specifically, this is a step in which the power supply device and the electronic device are connected via a USB cable, the power supply device is in a sleep state, and the switch section is turned on.
That is, by connecting the USB cable to the power supply device, the power supply device can recognize that the USB cable is connected, easily cancel the sleep state, and restart power supply.
At this time, it is preferable that a voltage detection unit provided in the power supply device detect a predetermined potential change of the CC terminal, and transmit a signal to the power supply control unit to cancel the sleep state and resume power supply.
The reason for this is that by controlling in this way, the sleep state can be more easily canceled and power supply can be restarted.

The USB cable of the present invention changes the potential of the CC terminal by a predetermined value by turning on and off a switch section provided inside, thereby switching the USB cable between a connected state and a non-connected state.
This makes it possible to create a state similar to when the USB cable is inserted or removed from the power supply device without having to insert or remove it.
For example, a circuit element that cooperates with a pull-up resistor in the power supply device to make the power supply device recognize the connection status of the USB cable, power supply conditions, etc. is provided, and a Such a USB cable can be constructed by turning on and off a switch section provided between the two.
That is, the USB cable of the present invention is not limited to a cable-type circuit configuration, but can be used with various circuit configurations that supply power from a power supply device to an electronic device, such as a circuit board that performs the same function, or a built-in circuit module of an electronic device. It can also be applied to aspects.
Therefore, it is possible to realize a Type-C cable that can arbitrarily control the power supply stop or restart of the power supply device, which can further increase the utility value of power supply devices that comply with the USB standard and quick charging standard, and increase the possibility of industrial use. This is extremely high.

10, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10j, 10k: USB cable, 11: first connector, 13: second connector, 15: circuit element, 15a: pull-down resistor, 15b: PD control section , 15c: eM power supply condition generation circuit, 15d: QC control section, 17: switch, 18: switch section, 18a: first switch section, 18b: second switch section, 19a: variable resistance section, 31: regulator IC, 33: Microcomputer, 35: Voltage dividing circuit, 80: Wake-up circuit, 81: Switching circuit, 83: Microcomputer, 90: Sensor, 100: Power supply device, 200: Electronic equipment

Claims (10)

A USB cable comprising a first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, and a second connector connected to an electronic device to which power from the power supply device is supplied. There it is,
a switch unit that switches the USB cable from a disconnected state to a connected state to release the sleep state of the power supply device when the power supply device is in a sleep state ;
The switch section is configured to switch the USB cable from an unconnected state to a connected state by turning the switch section from an OFF state to an ON state, and has a predetermined pull-down between the CC terminal and the grounding section. A USB cable characterized by having resistance . A USB cable comprising a first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, and a second connector connected to an electronic device to which power from the power supply device is supplied. There it is,
a switch unit that switches the USB cable from a disconnected state to a connected state to release the sleep state of the power supply device when the power supply device is in a sleep state ;
The switch unit is configured to switch the USB cable from an unconnected state to a connected state by turning the switch unit from an OFF state to an ON state, and the time for transitioning the power supply device to the sleep state is T. _S (seconds) and the time taken from the ON state to the OFF state to turn the switch section ON again is T ₀ (seconds), then it is assumed that the following relational expression (1) is satisfied. Featured USB cable.

3. The USB cable according to claim 1 , wherein the switch section is provided between at least one of the CC terminal or the GND terminal and a ground section. 4. The switch unit includes a power supply condition generation circuit for supplying a predetermined power to the power supply device based on a USB quick charging standard. The USB cable listed. 5. The USB cable according to claim 1, wherein the switch section includes a variable resistance section that switches between at least two different resistance values. Claim characterized in that, when the power supply device is a first power supply device, the switch section includes a second power supply device that supplies power to the switch section, which is different from the first power supply device. The USB cable according to any one of items 1 to 5. 7. The USB cable according to claim 1, wherein the switch section includes a drive section that switches the switch section. 8. The USB cable according to claim 1, further comprising a protection part for preventing at least reverse current flow or overcurrent between the VBUS terminal and the electronic device. A first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, a second connector connected to an electronic device to which power from the power supply device is supplied, and a switch section. A method of controlling a power supply device using a USB cable having a predetermined pull-down resistance between the CC terminal and the grounding part ,
A method for controlling a power supply device, comprising the following steps (1) to (3).
(1) Connecting the first connector to the power supply device and connecting the second connector to the electronic device.
(2) A step of turning off the switch section, disconnecting the USB cable, and putting the power supply device into a sleep state.
(3) A step of switching the switch section to an ON state, connecting the USB cable, and canceling the sleep state of the power supply device. A first connector connected to a power supply device and having at least a VBUS terminal, a GND terminal, and a CC terminal, a second connector connected to an electronic device to which power from the power supply device is supplied, and a switch section. A method for controlling a power supply device using a USB cable, comprising:
A method for controlling a power supply device, comprising the following steps (1) to (3).
(1) Connecting the first connector to the power supply device and connecting the second connector to the electronic device.
(2) A step of turning off the switch section, disconnecting the USB cable, and putting the power supply device into a sleep state.
(3) A step of turning on the switch unit to connect the USB cable and canceling the sleep state of the power supply device, which takes a time T _S ( (seconds), and the time it takes for the switch section to turn from the ON state to the OFF state and then to the ON state again is T 0 (seconds ) _. The process of canceling the sleep state of the power supply device.

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