Power supply control device and control method therefor

Abstract

To provide a power supply control device and a control method therefor that are excellent in universality and can precisely control power supply from a power supply device having a Type-C standard USB terminal to an electronic apparatus even with a simple configuration.SOLUTION: A power supply control device includes a connector for electrical connection to a power supply device, a connection establishment unit for controlling whether or not power is supplied, and an operation unit for switching between connection / disconnection of the connection establishment unit with respect to the power supply device. The connector includes a control side CC terminal for electrical connection to a power supply side CC terminal of the power supply device. The connection establishment unit is configured to make the power supply device recognize that an electronic apparatus is connected and supply power to the electronic apparatus, and when the operation unit is turned on, the power supply from the power supply device to the electronic apparatus is turned on, and when the operation unit is turned off, the power supply from the power supply device to the electronic apparatus is turned off.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a power supply control device and a control method for the power supply control device. In particular, the present invention relates to a power supply device and a control method for the power supply device, which can accurately control the power supply from a power supply device having a USB (Universal Serial Bus) terminal of the Type-C standard to an electronic device with a simple configuration and excellent universality.

Background Art

[0002] In recent years, due to the sophistication of electronic devices, the power consumption required for driving electronic devices has increased dramatically. Under such circumstances, the number of power supply devices that supply power via a USB terminal of the Type-C standard, which can supply a large amount of power, has been increasing. The reason for this is that by using a USB terminal of the Type-C standard, it has excellent universality according to a unified standard, and further convenience such as an increase in supply power (maximum 240W), facilitation of control of supply power by a control signal, reduction of heat generation loss, and expansion of applications due to an increase in the number of connector terminals (24 pins) can be obtained.

[0003] On the other hand, since the USB terminal of the Type-C standard can increase the supply power by a control signal, when a control device for turning on / off an electronic device is provided on a power line, the allowable power may be exceeded and damaged by the supply power. Furthermore, in order to prevent such damage, when a control device is selected according to the maximum value of the power that can be supplied, not only does the control device become large, but also a control device designed according to the power to be supplied is required, resulting in a problem of inferior universality. Among them, various techniques for controlling a power supply device using a CC (Configuration Channel) terminal in a USB terminal of the Type-C standard have been proposed conventionally.

[0004] As an example, a cable equivalent to a Type-C cable is disclosed that can stop the power supply from a power supply device by a switch unit provided on a communication line (see Patent Document 1). More specifically, as shown in FIG. 9(a), a cable 300 having a first connector 301, a second connector 302, a first power line 312 for power supply, a communication line 313, a control unit 303 connected to the communication line, a switch 304 provided on the communication line, a first temperature detection unit 308 capable of detecting the temperature around the first connector 301, and the like. And when the first temperature becomes equal to or higher than a predetermined temperature, such a control unit 303 is configured to disconnect the communication line 313 so that power supply via the first power line 312 is not performed between the power supply device and the electronic device.

[0005] Further, as another example, as shown in FIG. 9(b), a USB cable 410 provided with a switch unit 418 (418a, 418b) for releasing the sleep state of the power supply device 500 is disclosed (see Patent Document 2). More specifically, a USB cable 410 including a first connector 411 having at least a VBUS terminal 411a, a GND terminal 411b, and a CC terminal 411c connected to the power supply device 500, and a second connector 413 connected to an electronic device 600 to which power is supplied from the power supply device 500, the USB cable 410 being characterized in that it includes a switch unit 418 for switching the USB cable 410 from a disconnected state to a connected state with respect to the power supply device 500 to release the sleep state of the power supply device 500. And it is configured to release the sleep state of the power supply device 500 and make the power supply device 500 in a power supply state.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, the cable disclosed in Patent Document 1 is an invention of a safety device when the temperature of the connector becomes excessively high. Although the power supply can be stopped, in order to restart the power supply device, it was necessary to reconnect the power supply device and the electronic device once. Also, although it is described that the power supply from the power supply device is stopped using the CC terminal, it is an essential configuration to have a measuring instrument for measuring the temperature of the connector part, and it was necessary to have a complicated configuration as a whole circuit. That is, since a power supply control device designed according to the supplied power etc. is required, there is a problem that it is inferior in universality and it is difficult to accurately control the ON / OFF of the electronic device with a simple configuration.

[0008] Also, the USB cable disclosed in Patent Document 2 is an invention for use with a power supply device having a sleep function, and it was not considered for a power supply device without a sleep function. That is, it is a configuration applicable to a power supply device having a sleep function, and universality has not been sufficiently considered, and it was not intended to control the ON / OFF of the electronic device with a simple configuration.

[0009] Therefore, as a result of intensive studies, the inventors of the present invention have found that the ON / OFF of an electronic device can be controlled by controlling a power supply device using the CC terminal in a USB terminal of the Type-C standard, and have completed the present invention. That is, according to the present invention, an object is to provide a power supply device and a power supply device control method with excellent universality that can accurately control the power supply from a power supply device having a USB terminal of the Type-C standard to an electronic device even with a simple configuration.

Means for Solving the Problem

[0010] According to the present invention, there is provided a power supply control device for turning on / off the power supply from a power supply device having a USB terminal of the TYPE-C standard to an electronic device, the power supply device including a connector electrically connected via the USB terminal, a connection establishment unit for controlling the presence or absence of power supply from the power supply device to the electronic device, and an operation unit for switching the connection / disconnection of the connection establishment unit to the power supply device. The connector has a control-side CC terminal electrically connected to the power supply-side CC terminal of the power supply device. The connection establishment unit electrically connects the control-side CC terminal to the ground point via a predetermined pull-down resistor, thereby causing the power supply device to recognize that the electronic device is connected and supplying power to the electronic device. When the operation unit is in the ON state, the power supply from the power supply device to the electronic device is in the ON state, and when the operation unit is in the OFF state, the power supply from the power supply device to the electronic device is in the OFF state. A power supply control device is provided, which can solve the above-described problems. By configuring in this way, it is possible to use the power supply-side CC terminal to cause the power supply device to recognize that the electronic device, which is the power supply destination, is connected, and use this as a trigger to control the power supply device. That is, by using the power supply-side CC terminal that is unified and standardized, there is no need to design in accordance with the VBUS terminal whose voltage changes according to the requirements of the electrically connected electronic device, and the presence or absence of power supply can be accurately controlled. Therefore, it has excellent universality, and the power supply from a power supply device having a USB terminal of the Type-C standard to an electronic device can be accurately controlled even with a simple configuration.

[0011] Further, it is preferable that the operation unit of the power supply control device of the present invention includes a switch member provided between the control-side CC terminal and the ground point. By configuring in this way, it can be made smaller in size and have a simpler configuration.

[0012] Furthermore, it is preferable that the power supply control device of the present invention includes a switch member provided between the grounding point in the power supply control device and the ground terminal in the electronic device by the operation unit. By configuring in this way, even when there are a plurality of grounding points in the power supply control device, all can be operated collectively, and the connection / disconnection between the ground potential of the power supply control device and the ground potential of the electronic device can be accurately switched.

[0013] Furthermore, the power supply control device of the present invention is configured to supply power with standard power based on the USB standard when the power supply device recognizes that it is connected to the electronic device and also recognizes that no predetermined control signal is input to the power supply side CC terminal, and the connection establishment unit is configured to supply the power supply device with standard power as an initial condition when switching the operation unit from the OFF state to the ON state. By configuring in this way, it is possible to prevent supplying an excessively large voltage or the like unintentionally, prevent malfunctions from occurring in the electronic device, and use it more safely. And, for example, when the electronic device has additional functional circuits such as a power supply condition generation circuit described later, the functional circuit can be started more safely and stably using standard power.

[0014] Furthermore, it is preferable that the power supply control device of the present invention includes a power supply condition generation circuit in which the connection establishment unit transmits a control signal for instructing the supply power from the power supply device to the electronic device. By configuring in this way, the power supplied from the power supply device can be more accurately controlled to the desired power. And, for example, power supply can be performed based on the PD standard or the QC standard, which is one of the rapid charging standards.

[0015] Furthermore, it is preferable that the power supply control device of the present invention has a plurality of different circuit patterns associated with each of the power supply conditions when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power for the power supply device. By configuring in this way, different connection conditions can be assigned to each circuit pattern, and by selecting any one of the circuit patterns, different powers can be accurately supplied.

[0016] Moreover, in the power supply control device of the present invention, when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power for the power supply device, it is preferable that the operation unit is configured to switch the power supply conditions in a preset order. By configuring in this way, the switching mechanism of the connection conditions can be made into a simpler configuration.

[0017] Moreover, in the power supply control device of the present invention, it is preferable that the connection establishment unit has a notification unit indicating whether it is in a connected state or a non-connected state with respect to the control side CC terminal. By configuring in this way, it is possible to more accurately recognize from the outside whether the power is being supplied from the power supply device or the power supply has been stopped.

[0018] Moreover, in the power supply control device of the present invention, it is preferable that the connection establishment unit has an inspection unit for detecting the voltage supplied from the power supply device to the electronic device. By configuring in this way, it is possible to more accurately confirm whether the power supplied from the power supply device is the desired power. And, for example, when the power supply control device has a power supply condition generation circuit or the like, it is possible to accurately confirm whether the power supplied from the power supply device matches the power supply conditions and use it more safely.

[0019] Moreover, in the power supply control device of the present invention, when the power supply device has a sleep function of turning off the power supply when it is below a predetermined threshold current for a preset time or more, it is preferable that the connection establishment unit has a wake-up circuit for supplying a current exceeding the predetermined threshold current to the power supply device. By configuring in this way, even when the electronic device is not used for a long time, the power supply device can more effectively prevent itself from entering the sleep state.

[0020] Another aspect of the present invention is a control method for a power supply control device that turns on / off the power supply from a power supply device having a USB terminal of the TYPE-C standard to an electronic device, The power supply device includes a connector electrically connected via a USB terminal, a connection establishment unit that controls the presence or absence of power supply from the power supply device to the electronic device, and an operation unit that switches the connection / disconnection of the connection establishment unit to the power supply device, The connector has a control-side CC terminal that is electrically connected to the power supply-side CC terminal of the power supply device, It is a control method for a power supply control device, characterized by having the following steps (a1) to (a3) and (b1) to (b3). Step (a1): The step of operating the operation unit to the ON state and electrically connecting the control-side CC terminal to the ground point via a predetermined pull-down resistor. Step (a2): The step of causing the power supply device to recognize that the electronic device is connected. Step (a3): The step of supplying power from the power supply device to the electronic device. Step (b1): The step of operating the operation unit to the OFF state and releasing the pull-down of the control-side CC terminal. Step (b2): The step of causing the power supply device to recognize that the electronic device is removed. Step (b3): The step of stopping the power supply from the power supply device to the electronic device. By implementing in this way, separately from the VBUS terminal whose voltage changes according to the requirements of the electrically connected electronic device, the presence or absence of power supply can be controlled using the power supply-side CC terminal, which is a unified standard, and the risk of damage due to insufficient allowable voltage of the switch member can be significantly reduced. Therefore, the power supply from the power supply device to the electronic device can be safely controlled regardless of the supplied power.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with appropriate reference to the drawings. In addition, in each drawing used for the description, the same constituent elements may be denoted by the same reference numerals, and the description thereof may be omitted. Each figure used in the description schematically shows these inventions to the extent that they can be understood. The usage devices, shapes, dimensions, materials, etc. described in the description are merely preferred examples within the scope of this invention. Therefore, the present invention is not particularly limited to only the following embodiments without reason.

[0023] [First Embodiment] As illustrated in FIG. 1, the power supply control device according to the first embodiment is a power supply control device 10 that turns ON / OFF the power supply from a power supply device 30 having a USB terminal 32 of the TYPE-C standard to an electronic device 50. The power supply device 30 includes a connector 12 electrically connected via the USB terminal 32, a connection establishment unit 14 that controls the presence or absence of power supply from the power supply device 30 to the electronic device 50, and an operation unit 16 that switches the connection / disconnection of the connection establishment unit 14 to the power supply device 30. The connector 12 has a control-side CC terminal 12a electrically connected to the power supply-side CC terminal 32a of the power supply device 30. The connection establishment unit 14 electrically connects the control-side CC terminal 12a to a ground point 14b via a predetermined pull-down resistor 14a, thereby causing the power supply device 30 to recognize that the electronic device 50 is connected and supply power to the electronic device 50. When the operation unit 16 is in the ON state, power is supplied from the power supply device 30 to the electronic device 50, and when the operation unit 16 is in the OFF state, the power supply from the power supply device 30 to the electronic device 50 is stopped. Note that, as an example, the power supply control device of the present invention is described as a circuit module incorporated in an electronic device, but it may also be a circuit configuration externally attached to the electronic device, a cable-type circuit configuration, an adapter attached to the power supply device side, or the like.

[0024] 1. Power Supply Device The power supply device is a circuit configuration that outputs predetermined power to a later-described electronic device via a power line connected to a power supply-side VBUS terminal, which is a power supply destination, when the power supply control device is connected. That is, as shown in FIG. 1, the power supply device preferably includes a voltage detection unit 34 that measures the potential of the power supply-side CC terminal 32a, a pull-up resistor 36 that controls the potential applied to the power supply-side CC terminal 32a, and a supply control unit 38 that controls power supply. Specifically, the power supply device is preferably an AC adapter connected to a 100V AC outlet for use, a portable battery using a lithium battery or a gallium nitride battery, an automotive battery, a fuel cell, a power generation device such as solar power or wind power, or the like. The reason for this is that such a power supply control device can be configured with a common standard, so it has excellent universality and can supply a predetermined power with a simpler configuration. Furthermore, it can preferably receive the control signal transmitted by the power supply condition generation circuit described later and output a predetermined power based on such a control signal, more effectively preventing malfunctions of the electronic device. Note that in FIG. 1 and the like, an integrated grounding point 90 that makes the ground potential of the power supply control device 10 the same as the ground potential of the electronic device 50 is shown for convenience.

[0025] Also, the power supply device preferably has a circuit configuration that measures the voltage of the power supply-side CC terminal, recognizes the connection with the electronic device, and supplies or stops power based on such recognition. That is, when the voltage detection unit of the power supply device measures the potential of the power supply-side CC terminal and detects that the power supply-side CC terminal is connected to a grounding point (a terminal that is the internal ground potential of the power supply control device) via a circuit element having a predetermined resistance value, it is preferable to determine that the electronic device is in a connected state. The reason for this is that with such a configuration, the ON / OFF of the power supply device can be controlled more quickly.

[0026] Also, in the power supply device, as a specific configuration of the voltage detection unit, a voltmeter IC, a wattmeter IC, or the like is preferable. The reason is that with such a configuration, the switch member described later can more accurately release the sleep state of the power supply device and set it to the power supply state of the power supply device.

[0027] Also, in the power supply device, the supplied power value is preferably a value within the range of 2.5 to 240 W, usually based on the USB Type-C standard. The reason is that by having the function of supplying such power, it can be used more generally for general electronic devices. Therefore, the supplied power value of the power supply device is more preferably a value within the range of 5 to 150 W, and even more preferably a value within the range of 10 to 100 W. At this time, the supplied voltage value of the power supply device is preferably a value within the range of 3.3 to 48 V, usually.

[0028] Also, the power supply device is preferably configured to supply power with standard power based on the USB standard when it recognizes that it is connected to an electronic device and that no control signal is input to the power supply side CC terminal. The reason is that by supplying power with standard power in this way, it is possible to prevent supplying an excessively large voltage or the like to the electronic device unintentionally, and more effectively prevent malfunctions from occurring in the electronic device.

[0029] Also, the standard power in the power supply device is preferably a value within the range of 1.5 to 24 W, usually. The reason is that by setting such a power value, it can be a value within the allowable voltage of generally used electronic devices, and the versatility can be enhanced. Therefore, the standard power is more preferably a value within the range of 1.8 to 21 W, and even more preferably a value within the range of 2 to 18 W.

[0030] Also, in the power supply device, the standard voltage, which is the voltage component of the standard power, is not particularly limited, but is preferably a value within the range of 3 to 8 V, usually. This is because it can be set to a value within the allowable voltage of commonly used electronic devices, which can enhance versatility more effectively. Therefore, the standard voltage is more preferably set to a value within the range of 3.5 to 7V, still more preferably set to a value within the range of 4 to 6V, and particularly preferably 5V.

[0031] Moreover, in the power supply device, it is preferable to provide an auxiliary power supply device separately from the above-mentioned power supply device. That is, when the power supply device is regarded as the first power supply device, it is preferable to arrange the second power supply device as the auxiliary power supply device in parallel, and configure the electrical connection of the power supply control device to be switched from the first power supply device to the second power supply device. The reason for this is that by using these two power supply devices in combination in this way, when the main first power supply device stops, the second power supply device can be turned on more quickly. Therefore, the second power supply device can be used as an emergency power supply device.

[0032] 2. Electronic device The electronic device is electrically connected to the power supply device and is a DC drive device that is driven using the predetermined power output from the USB terminal of the power supply device. That is, as shown in FIG. 1, it preferably has a device-side connector 52 for electrically connecting between the power supply device 30 and the electronic device 50, a ground terminal 54 for grounding the ground wire, and a drive unit 56 that receives DC power based on the USB standard from the power supply device 30 and is driven. Furthermore, the device-side connector 52 preferably has a device-side CC terminal 52a, a device-side VBUS terminal 52b, and a device-side GND terminal 52c for electrically connecting between the electronic device 50 and each terminal of the power supply-side CC terminal 32a, the power supply-side VBUS terminal 32b, and the power supply-side GND terminal 32c.

[0033] Specifically, the electronic device is preferably a fan (including a circulator), a ventilation fan, a heater, a cooler, a vacuum cleaner, a refrigerator, a warm storage refrigerator, a notebook PC, a light, a display, a radio, a television, an ultrasonic transmitter, a metal detector, a fish finder, a portable game machine, a communication modem, a video disc player, an IC recorder, a measuring instrument, a laser oscillator, etc. The reason for this is that such an electronic device can be driven more accurately by the power supply control device.

[0034] Also, in the electronic device, the power consumption required for driving is preferably a value within the range of 2.5 to 240 W based on the Type-C standard. The reason for this is that with such power consumption, it can be driven within the allowable power range of the power supply control device, eliminating the need for an additional boost circuit, etc., and thus the entire adapter can be made smaller. Therefore, it is more preferable that the power consumption of the electronic device to be driven is a value within the range of 5 to 150 W, and even more preferably a value within the range of 10 to 100 W.

[0035] 3. Connector The connector is a terminal member of the power supply control device that is electrically connected to the USB terminal of the power supply device. That is, as shown in FIG. 1, the connector 12 is characterized by having a control side CC terminal 12a that electrically connects between the power supply control device 10 and at least the device side CC terminal 52a. By having the control side CC terminal in this way, the connection establishment part described later can be electrically connected, enabling the power supply device to recognize that the electronic device is connected and supply power from the power supply device to the electronic device. Therefore, the connector is preferably a plug or receptacle of the Type-C standard. The reason for this is that it can be connected to the power supply device without using a conversion connector or the like, and the entire power supply control device can be made smaller.

[0036] Further, as shown in FIG. 2, the connector 12 preferably has a control-side VBUS terminal 12b for electrically connecting between the power supply control device 10 and the device-side VBUS terminal 52b. Furthermore, as shown in FIG. 2, the connector 12 preferably has a control-side GND terminal 12c for electrically connecting between the power supply control device 10 and the device-side GND terminal 52c. The reason is that having such terminals enables the power line and the ground line to be drawn into the power supply control device via the control-side VBUS terminal and the control-side GND, allowing for more miniaturization. Furthermore, when the power supply control device has circuit elements that require external power supply, the necessary power can be supplied to the circuit elements from the drawn power line and ground line.

[0037] Also, as shown in FIG. 2, the connector 12 preferably has a second connector 12'' provided in series with the first connector 12' as the connector 12 provided on the power supply device 30 side, separately from the first connector 12'. The reason is that with such a configuration, the power supply device and the attached circuit elements provided in the electronic device can be electrically connected via the power supply control device.

[0038] Also, although not particularly shown, when a ground line is drawn into the power supply control device, it preferably has a switch member for switching the connection / disconnection of the ground line. The reason is that by operating in conjunction with the operation unit, the ON / OFF of the power supply device can be controlled more reliably. Therefore, when the power supply control device has a switch member for the ground line, it is preferably configured to operate in conjunction with the ON / OFF of the operation unit.

[0039] 4. Connection establishment unit (1) Basic configuration The connection establishment unit is a circuit configuration that causes the power supply device to recognize that the electronic device is connected and controls the presence or absence of power supply from the power supply device to the electronic device. That is, by electrically connecting the control-side CC terminal to the ground point via a predetermined pull-down resistor, the potential of the power supply-side CC terminal is set to a predetermined potential, and the voltage detection unit is made to determine that the potential has become the predetermined potential, thereby causing the power supply device to recognize that the electronic device is connected. Specifically, as shown in FIG. 1, the connection establishment unit 14 is characterized by having a pull-down resistor 14a having a predetermined resistance value and a ground point 14b. Here, as shown in FIG. 1, the ground point 14b is a circuit element having the same ground potential as the ground terminal 54 that grounds the ground wire.

[0040] Moreover, it is preferable that the connection establishment unit has a power supply condition generation circuit that supplies predetermined power based on the USB rapid charging standard. The reason for this is that since the power supply device can output power according to the rapid charging standard, the versatility of the power supply control device can be further improved. Furthermore, based on the preset power supply conditions, predetermined power can be output, and malfunction of the electronic device can be more effectively prevented.

[0041] Moreover, it is preferable that the connection establishment unit is configured to supply standard power as an initial condition when the operation unit described later is switched from the OFF state to the ON state. The reason for this is that, for example, when the electronic device has additional functional circuits such as the power supply condition generation circuit described later, the functional circuits can be started more stably using the standard power. Furthermore, it is possible to prevent the power supply device from receiving a control signal from the power supply condition generation circuit immediately after startup and supplying an excessively large voltage or the like unintentionally, and more effectively prevent problems from occurring in the electronic device.

[0042] (2) Pull-down resistor The pull-down resistor is a circuit element having a predetermined resistance value that creates a voltage division that serves as a trigger for the voltage detection unit to recognize the connection, together with the pull-down resistor and the pull-up resistor of the power supply device. That is, the resistance value of the pull-down resistor 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 unit of the power supply device is stabilized, and false detection due to measurement errors and the like can be more effectively prevented. On the other hand, when the resistance value is excessively high, the potential change of the CC terminal becomes excessively small, and it is more likely to be affected by measurement errors. Therefore, it is more preferable that the predetermined resistance value is within the range of 2 to 10 kΩ, and even more preferably within the range of 3 to 6 kΩ. More specifically, it is particularly preferable that the resistance value of the pull-down resistor is 5.1 kΩ.

[0043] (3) Power supply condition generation circuit The power supply condition generation circuit is a circuit configuration that transmits a control signal as a predetermined power value to the power supply device based on the USB PD (USB Power Delivery) standard or the QC standard, which is a rapid charging standard. That is, as shown in FIGS. 3(a) to (b), the power supply condition generation circuit incorporates a power supply condition generation circuit 60 that generates power supply conditions conforming to the USB PD standard, and is preferably configured to be able to output a pulse train, which is an electrical signal corresponding to the desired power supply conditions, to the power supply device 30 via the control-side CC terminal 12a. The power supply condition generation circuit 60 is preferably electrically connected to the power line via a pull-in resistor 58 and is configured to be supplied with power. Furthermore, the power supply condition generation circuit 60 is preferably electrically connected to the ground point 14b via a pull-down resistor 14a and is configured to be recognized by the power supply device 30 as the internal resistance of the power supply condition generation circuit 60. More specifically, the power supply condition generation circuit is preferably configured by a microcomputer, an emulator IC, or the like. The reason is that, with such a configuration, a control signal for instructing power supply can be sent more accurately based on the rapid charging standard.

[0044] Moreover, in the power supply condition generation circuit, the power supply conditions can be set by a general configuration. However, it is preferable to have a configuration in which a control signal is transmitted by programming a microcomputer, an emulator IC, etc., a configuration in which a control signal is transmitted based on a voltage dividing resistor by a resistor, a configuration in which a control signal is transmitted from an external device by I2C or UART, etc. The reason is that, with such a configuration, the power supply device can be instructed more accurately about the required power value.

[0045] Moreover, as shown in FIG. 3(a), it is preferable that the power supply condition generation circuit 60 is electrically connected to the power supply side CC terminal 32a at least via the control side CC terminal 12a. On the other hand, as shown in FIG. 3(b), it is also preferable that the power supply condition generation circuit 60 is connected to both the CC1 terminal and the CC2 terminals (52a′, 52a″). The reason is that, with such a configuration, a control signal can be sent to both the CC1 terminal and the CC2 terminal, so that the power supply control device can be arranged without considering the insertion direction of the connector of the power supply control device.

[0046] Moreover, as shown in FIG. 2, when the electronic device 50 has a power supply condition generation circuit 74 separately from the power supply control device 10, it is preferable that the power supply control device 10 has a first connector 12′ and a second connector 12″. The reason is that, with such a configuration, the power supply condition generation circuit provided inside the electronic device can be drawn into the power supply control device and used as the power supply condition generation circuit of the power supply control device.

[0047] (4) Standard power Moreover, it is preferable that the power supply condition generation circuit outputs a control signal based on the difference between the desired supply power and the standard power. Here, the standard power is the power value supplied when the power supply device recognizes that it is connected to the electronic device and also recognizes that no control signal is input to the power supply side CC terminal. That is, it is preferably in the same manner as the standard power in the power supply device described above.

[0048] 5. Operation unit Also, as illustrated in FIG. 1, the operation unit 16 is a switch member that switches the connection / disconnection of the connection establishment unit 14 with respect to the power supply device 30. That is, the operation unit is a part that mutually switches the state of the power supply control device with respect to the power supply device between a connected state and a non-connected state by switching between an ON state and an OFF state, and is a switch member that switches the ON / OFF of the power supply of the power supply device. Specifically, by setting the potential of the power supply side CC terminal to a value within the range of the reference potential via the control side CC terminal, the ON state can be set, and by setting the potential of the power supply side CC terminal to a value deviated from the reference potential, the OFF state can be set. Here, although the reference potential varies depending on the specifications of the power supply device, etc., it is preferable that the GND terminal is set as the ground potential, and the CC terminal is set as the potential when connected to the ground point via a resistor (equivalent internal resistance in the case of an IC) within the range where the voltage detection unit recognizes the connection. The reason for this is that by setting such a reference potential, a power supply control device conforming to the Type-C standard can be configured with a simpler structure.

[0049] Also, it is preferable that the operation unit is configured to be in the OFF state when the connector is removed from the power supply device. The reason for this is that it can effectively prevent the power supply from being unintentionally supplied when the operation unit remains in the ON state and the power supply device and the electronic device are connected. Therefore, when the connector becomes non-connected, it is preferable that the operation unit returns to the OFF state by the release of a presser such as an electromagnetic relay, a spring, or a magnetic switch.

[0050] Moreover, it is preferable that the operation unit includes a switch member provided between the control-side CC terminal and the ground point. The reason for this is that with such a configuration, the connection state of the connection establishment unit can be switched with a simpler configuration. Here, as illustrated in FIG. 1, the operation unit 16 is described as being arranged between the control-side CC terminal 12a and the pull-down resistor 14a. However, it is also preferable to have a configuration where it is arranged between the pull-down resistor 14a and the ground point 14b.

[0051] Moreover, it is preferable that the operation unit includes a switch member provided between the ground point in the power supply control device and the ground terminal in the electronic device. The reason for this is that with such a configuration, even when there are multiple ground points in the power supply control device, they can all be operated collectively, and the connection / disconnection between the ground potential of the power supply control device and the ground potential of the electronic device can be accurately switched.

[0052] Moreover, as illustrated in FIGS. 3(a) to 3(b), it is preferable that the operation unit is provided between circuits that electrically connect the ground wire to the signal ground 54' and that electrically connect a ground point at a voltage level different from that of the signal ground 54' to the signal ground 14b'. The reason for this is that when each ground point connected to a metal frame or the like and the signal ground have the same voltage level, the ground wire is in a grounded state, so multiple existing ground points can be grouped together in one place.

[0053] Moreover, when the power supply device is the first power supply device, it is preferable that the operation unit is provided with a second power supply device that supplies power to the operation unit and is different from the first power supply device. Specifically, it is preferable that the switch member has, as the second power supply device, a lithium-ion battery, an alkaline button battery, an alkaline dry battery, a solar panel, a piezoelectric element, or the like. This is because it can be used as a power source that can supply power independently of the power supply device, such as when receiving power from the power supply device to drive the switch member.

[0054] Moreover, the operation unit preferably has a drive unit for controlling the switching. Specifically, the drive unit is preferably a control device for controlling the drive of the switch member described later, and is preferably composed of a microcomputer, a PLC, an electromagnetic relay, or the like. Furthermore, the drive unit is preferably driven based on signals output from a temperature sensor, a current sensor, a voltage sensor, an IC for wireless communication, etc. attached to the drive unit. This is because even when the switch and the operation unit are separated, signals from sensors, ICs for wireless communication, etc. can be used as triggers, improving the degree of freedom in the arrangement of the switch.

[0055] Moreover, it is preferable to use a contact switch or a non-contact switch as the type of the operation unit. More specifically, as the contact switch, it is preferably a rocker switch, a push switch, a tactile switch, a slide switch, a rotary switch, a toggle switch, an electromagnetic relay switch, a jack switch, or the like. Moreover, as the non-contact switch, it is preferably a MOSFET (Metal-oxide-semiconductor field-effect transistor) switch which is a metal oxide semiconductor field effect transistor, a solid state switch, or the like. This is because switches of such types are easy to obtain and assemble, and mass production is easy.

[0056] 6. Configuration Example (1) Configuration Example 1 Moreover, as Configuration Example 1, when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power with respect to the power supply device, it preferably has a plurality of different circuit patterns corresponding to each of the power supply conditions. This is because different connection conditions can be assigned to each circuit pattern, and by selecting any one of the circuit patterns, different powers can be supplied with higher precision.

[0057] Specifically, as illustrated in FIG. 4, it preferably has a power supply condition generation circuit 62, and in such a power supply condition generation circuit 62, resistors 64a, 64b, 64c having different resistance values and an open end 64d, which are electrically connected to a ground point, are arranged in parallel. And it is preferable that such a plurality of circuit patterns 64 can be configured to select and switch any one of the circuit patterns by an operation unit 16 described later. This is because, in this way, by changing the resistance value for pull-down with respect to the power supply condition generation circuit, a control signal for instructing a power supply condition corresponding to such a resistance value can be sent to the power supply device.

[0058] On the other hand, as illustrated in FIG. 4, in the power supply condition generation circuit 62, it is preferable that 66a to 66c electrically connected to a ground point and an open end 66d are arranged in parallel. And it is preferable that such a ground pattern 66 can be configured to select and switch any one of the ground patterns by the operation unit 16. This is because, by having such a ground pattern in this way, it is possible to switch between making the ground line in a grounded state and a non-grounded state, and when it is non-grounded, indirectly, the power supply device and the power supply control device can be made in a non-connected state.

[0059] Furthermore, in the power supply condition generation circuit, it is preferable that the operation unit is configured to be interlocked with the circuit pattern and the ground pattern, and the open end of the circuit pattern and the open end of the ground pattern are arranged to coincide. This is because, by adopting such a switchable configuration, even with a simpler configuration, the power to be supplied can be changed and stopped by operating one operation unit. In addition, when the operation unit has such an interlocked configuration, it is preferable that the ground wire is electrically connected to a ground point having the same potential as the ground potential of the ground point in the power supply control device.

[0060] (2) Configuration Example 2 Moreover, when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power for the power supply device, it is preferable that the operation unit is configured to switch the power supply conditions in a preset order. The reason for this is that the switching mechanism of the connection conditions can be made simpler. Specifically, it is preferable to use one push-type multi-contact switch and configure it to switch the power supply conditions each time it is pressed.

[0061] (3) Configuration Example 3 Moreover, as shown in FIG. 5, it is preferable that the connection establishment unit has a notification unit 70 that indicates whether it is in a connected state or a non-connected state with respect to the control-side CC terminal 12a. The reason for this is that it can make it possible to more accurately recognize from the outside whether the power is being supplied from the power supply device or the power supply has been stopped. Specifically, it is preferable that the notification unit is an LED, a liquid crystal, a buzzer, or the like. Note that FIG. 5 shows, for convenience, an integrated ground point 90' that makes the ground potential of the power supply control device 10 the same as the potential of the signal ground 54' of the electronic device 50.

[0062] (4) Configuration Example 4 Moreover, as shown in FIG. 5, it is preferable that the connection establishment unit 14 has an inspection unit 72 that detects the voltage supplied from the power supply device 30 to the electronic device 50. The reason for this is that it can more accurately confirm whether the power supplied from the power supply device is the desired power. Furthermore, when the power supply control device has a power supply condition generation circuit or the like, it is because it can more accurately confirm whether the power supplied from the power supply device matches the power supply conditions. Specifically, in addition to measurement by resistance division, it is preferably a power meter IC, a voltage meter IC, or the like. Then, as shown in FIG. 5, when the connection establishment unit 14 has the inspection unit 72, it preferably has an inspection control unit 68 that receives information from the inspection unit 72 and sends a control signal to the related circuit configuration. At this time, the inspection control unit is preferably a microcomputer, an emulator IC, or the like.

[0063] Also, although not particularly shown, when the power supply device has a function based on the QC standard, which is a rapid charging standard, it preferably has a voltage division circuit based on the QC standard for the DP / DM terminals (sometimes referred to as D+ / D- terminals) of the power supply device. That is, by electrically connecting the CC terminal as a connection establishment unit to the ground point via a predetermined pull-down resistor and having a predetermined voltage division circuit, the ON / OFF control of the power supply device and the voltage control based on the QC standard can be performed together. The QC standard is a standard in which the power supply device supplies a voltage based on the potential difference by applying different voltages to the DP terminal and the DM terminal at the USB terminal of the power supply device, respectively.

[0064] Also, although not particularly shown, when the connection establishment unit has an inspection unit, it preferably has a power adjustment unit that measures the difference between the power supplied from the power supply device and the preset power and corrects it to reduce such a difference. That is, the power adjustment unit preferably has a configuration in which, based on the preset power, it transmits a predetermined pulse signal to the power supply side CC terminal, and each time one such pulse signal is transmitted, the output power is increased or decreased by a predetermined power. Such a configuration can be achieved by including a microcomputer or the like in the power control circuit. This is because the output voltage of the power supply device can be adjusted with a resolution based on the number of pulse signals, more effectively preventing the deviation between the output value and the set value in the power supply device and enabling output with a predetermined power.

[0065] Further, when the connection establishment unit 14 includes the inspection unit 72, as shown in FIG. 2, it is preferable to provide the first connector 12' and the second connector 12'', and draw in from the power line passing therebetween to provide the inspection unit 72a. This is because, with such a configuration, it is possible to accurately measure the power and the like supplied from the power line.

[0066] (5) Configuration Example 5 Further, as shown in FIG. 6, when the power supply device 30 has a sleep function of stopping power supply when the current is below a predetermined threshold current for a preset time or more, the connection establishment unit 14 preferably has a wake-up circuit 80 that supplies a current exceeding the predetermined threshold current to the power supply device 30. This is because, even when the electronic device is not used for a long time, the power supply device can be more effectively prevented from entering the sleep state.

[0067] Specifically, as shown in FIG. 6, the wake-up circuit 80 is provided within the power supply control device 10 between the power line and the ground point, and is composed of a switching circuit 81 and a microcomputer 83. The microcomputer 83 outputs drive pulses to the switching circuit 81 at a predetermined period. The switching circuit 81 becomes ON for a predetermined time in response to this drive pulse, so a predetermined current flows through the power line. That is, since this predetermined current is set to be larger than the threshold current at which the power supply device 30 enters the sleep state, it is possible to effectively prevent the power supply device from entering the sleep state.

[0068] Further, it is preferable that the wake-up circuit has an ON / OFF changeover switch between the power line and the wake-up circuit so that the power supply device can switch the validity / invalidity of the function of preventing it from entering the sleep state.

[0069] Further, the wake-up circuit may be configured to be built in the power supply control device, but it is also preferable that it is 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 changed according to the specifications of the power supply device, electronic equipment, etc.

[0070] (6) Configuration Example 6 Further, as shown in FIGS. 7(a) to 7(b), it is preferable that the eMarker chip 20 is electrically connected to either one of the power supply side CC terminals 32a (CC1 terminal 32a', CC2 terminal 32a'') of the power supply control device of the present invention. The reason for this is that by providing the eMarker chip in this way, after the power supply device is turned on, the power supplied can be changed within a predetermined range based on the rapid charging standard.

[0071] For example, as shown in FIG. 7(a), it is preferable that the CC1 terminal 32a' of the power supply device 30 is electrically connected to the ground point 14b via the CC1 terminal 12a' of the power supply control device 10 and the pull-down resistor 14a. And it is preferable that the CC2 terminal 32a'' of the power supply device 30 is electrically connected to the eMarker chip 20 via the CC2 terminal 12a'' of the power supply control device 10. Note that the configurations of the above-described CC1 terminal and CC2 terminal may be interchanged.

[0072] As another example, as shown in FIG. 7(b), it is preferable that the CC1 terminal 32a' and the CC2 terminal 32a'' of the power supply device 30 are electrically connected to the ground point 14b via the CC1 terminal 12a' and the CC2 terminal 12a'' of the power supply control device 10 and the pull-down resistors 14a and 14c, respectively. Preferably, the eMarker chip 20 is provided between the CC2 terminal 32a'' of the power supply device 30 and the device-side CC2 terminal 52a'' of the electronic device 50. Note that the configurations of the above-described CC1 terminal and CC2 terminal may be interchanged.

[0073] (7) Other configuration examples Also, preferably, an auxiliary switch member is provided between the power supply-side VBUS terminal and the device-side VBUS terminal separately from the switch member in the operation unit described above. That is, when the switch member in the operation unit is used as the first switch member, it is preferable to provide a second switch member and use the two switch members in combination. Specifically, the second switch member can have the same configuration as the first switch member, and it is preferable to use a contact switch or a non-contact switch. The reason for this is that by using the two switch members in combination, the power supply can be stopped more reliably. Therefore, from the viewpoint of a simpler configuration, it is preferable that the two switch members are configured to be interlocked and switched between ON and OFF.

[0074] [Second Embodiment] The control method of the power supply control device according to the second embodiment is a control method of a power supply control device that turns on / off the power supply from a power supply device having a USB terminal conforming to the TYPE-C standard to an electronic device, and includes a connector electrically connected to the power supply device via the USB terminal, a connection establishment unit that controls the presence or absence of power supply from the power supply device to the electronic device, and an operation unit that switches the connection / disconnection of the connection establishment unit to the power supply device. The connector has a control-side CC terminal electrically connected to the power supply-side CC terminal of the power supply device, and is characterized by having the following steps (a1) to (a3) and (b1) to (b3). Step (a1): A step of operating the operation unit to the ON state and electrically connecting the control-side CC terminal to the ground point via a predetermined pull-down resistor. Step (a2): A step of causing the power supply device to recognize that the electronic device is connected. Step (a3): A step of supplying power from a power supply device to an electronic device. Step (b1): A step of operating the operation unit to the OFF state to release the pull-down of the control-side CC terminal. Step (b2): A step of causing the power supply device to recognize that the electronic device has been removed. Step (b3): A step of stopping the power supply from the power supply device to the electronic device.

[0075] 1. Previous step As shown by reference numeral S1 in FIG. 8, the present invention preferably includes, as a previous step, a step of electrically connecting a power supply device and an electronic device, and a step of electrically connecting a connector of a power supply control device and the power supply device. At this time, the operation unit of the power supply control device may be in either the ON state or the OFF state, but it is preferably connected in the OFF state. The reason for this is that by connecting the operation unit of the power supply control device in the OFF state, it is possible to effectively prevent the unintentional supply of power from the power supply device to the electronic device during connection.

[0076] 2. Step (a1) Step (a1) is a step of switching the operation unit to the ON state, as shown by reference numeral S2 in FIG. 8. Specifically, for example, when the operation unit has a switch member, it is preferable to operate the switch member to electrically connect the control-side CC terminal and the ground point. The reason for this is that by implementing in this way, it can be switched with a simpler configuration.

[0077] 3. Step (a2) Step (a2) is a step of bringing the connection establishment unit into a connected state with respect to the power supply device and causing the power supply device to recognize that the electronic device has been connected, as shown by reference numeral S3 in FIG. 8. Specifically, it is preferable to electrically connect the control-side CC terminal to the ground point via a predetermined pull-down resistor, set the potential of the power supply-side CC terminal to a predetermined potential, and cause the voltage detection unit to determine that the potential has reached the predetermined potential, thereby recognizing that the electronic device is connected. The reason is that by implementing in this way, the potential of the power supply-side CC power supply device can be set within a predetermined range via the control-side CC terminal, and the power supply device can be controlled more accurately regardless of the supplied power.

[0078] 4. Step (a3) As shown by reference numerals S4 to S5 in FIG. 8, step (a3) is a step of supplying power from the power supply device to the electronic device to drive the electronic device. Specifically, when the voltage detection unit determines that the electronic device is connected, it is preferable for the voltage detection unit to send a signal permitting the supply of predetermined power to the supply control unit. Then, it is preferable for the supply control unit that has received the permission signal to turn on the power supply device and supply predetermined power via the USB terminal. The reason is that by implementing in this way, the power supply control unit can quickly recognize the connection to the power supply device and supply the predetermined power more safely and stably. And this is because the supplied power can be used to drive the electronic device more accurately.

[0079] 5. Step (b1) As shown by reference numeral S6 in FIG. 8, step (b1) is a step of switching the operation unit to the OFF state. Specifically, for example, when the operation unit has a switch member, it is preferable to operate the switch member to electrically disconnect the control-side CC terminal from the ground point. The reason is that by implementing in this way, it can be switched with a simpler configuration.

[0080] 6. Step (b2) Step (b2) is a step of making the connection establishment unit in a disconnected state with respect to the power supply device as shown by reference numeral S7 in FIG. 8, and causing the power supply device to recognize that the connection with the electronic device has been disconnected. Specifically, it is preferable to perform a step of disconnecting the control-side CC terminal from the connection establishment unit, causing the voltage detection unit to determine that the value has deviated from the predetermined potential, and causing the power supply device to recognize that the connection with the electronic device has been disconnected. The reason for this is that by implementing in this way, the potential of the power supply-side CC power supply device can be made to deviate from the predetermined range via the control-side CC terminal, and the power supply device can be controlled more accurately regardless of the supplied power.

[0081] 7. Step (b3) Step (b3) is a step of stopping the power supply from the power supply device to the electronic device and stopping the electronic device as shown by reference numerals S8 to S9 in FIG. 8. Specifically, when the voltage detection unit determines that the connection with the electronic device has been disconnected, it is preferable for the voltage detection unit to send a signal to the supply control unit to stop the supply of the predetermined power. Then, it is preferable for the supply control unit that has received the permission signal to turn off the power supply device and stop the supply of the predetermined power.

Industrial Applicability

[0082] The power supply control device of the present invention is configured to control the ON / OFF of an electronic device by controlling a power supply device using a CC terminal in a USB terminal of the Type-C standard. For example, it is characterized by including a connection establishment unit that controls the presence or absence of power supply from the power supply device to the electronic device, and an operation unit that switches the connection / disconnection of the connection establishment unit with respect to the power supply device. Thereby, by turning on the operation unit, the power supply from the power supply device to the electronic device can be turned on, and by turning off the operation unit, the power supply from the power supply device to the electronic device can be turned off. Moreover, even with a simple configuration, the power supply from the power supply device to the electronic device can be accurately controlled. Furthermore, since it is not affected by the supplied power, universality can be enhanced. That is, in the power supply control device of the present invention, since the voltage detection unit of the power supply device operates with very little power, as long as a USB terminal of the Type-C standard is used, regardless of the power supplied by the power line, it is expected that a power supply control device with a common configuration (universality) can be used. In addition, since the power supply control device of the present invention does not depend on the power supplied by the power line, even when the operation unit is a contact switch, risks such as abnormal heating caused by contact resistance or dust accumulated on the switch can be significantly reduced, and it can be expected to be used more safely.

Explanation of Reference Numerals

[0083] 10: Power supply control device, 12: Connector, 12a: Control side CC terminal, 12b: Control side VBUS terminal, 12c: Control side GND terminal, 14: Connection establishment unit, 14a: Pull-down resistor, 14b: Ground point, 16: Operation unit, 30: Power supply device, 32: USB terminal, 32a: Power supply side CC terminal, 32a´: CC1 terminal, 32a´´: CC2 terminal, 32b: Power supply side VBUS terminal, 32c: Power supply side GND terminal, 34: Voltage detection unit, 36: Pull-up resistor, 38: Supply control unit, 50: Electronic device, 52: Device side connector, 52a: Device side CC terminal, 52b: Device side VBUS terminal, 52c: Device side GND terminal

Claims

1. A power supply control device for turning on / off the power supply from a power supply device having a USB terminal of TYPE-C specification to an electronic device, The power supply device includes a connector electrically connected via the USB terminal, a connection establishment unit that controls the presence or absence of power supply from the power supply device to the electronic device, and an operation unit that switches the ON / OFF of the connection establishment unit with respect to the power supply device, The connector has a control-side CC terminal electrically connected to the power supply-side CC terminal of the power supply device, The connection establishment unit is configured to electrically connect the control-side CC terminal to a ground point via a predetermined pull-down resistor, thereby causing the power supply device to recognize that the electronic device is connected and supply power to the electronic device, and When the operation unit is in the ON state, the power supply from the power supply device to the electronic device is in the ON state, and when the operation unit is in the OFF state, the power supply from the power supply device to the electronic device is in the OFF state. A power supply control device characterized by this configuration.

2. The power supply control device according to claim 1, wherein the operation unit includes a switch member provided between the control-side CC terminal and the ground point.

3. The power supply control device according to claim 1 or 2, wherein the operation unit includes a switch member provided between the ground point and the ground terminal in the electronic device.

4. When the power supply device recognizes that it is connected to the electronic device and recognizes that no predetermined control signal is input to the power supply-side CC terminal, it is configured to supply power at the standard power based on the USB standard. When the connection establishment unit switches the operation unit from the OFF state to the ON state, as an initial condition, the power supply device is configured to supply the standard power. A power supply control device according to claim 1 or 2, characterized by this configuration.

5. The power supply control device according to claim 1 or 2, characterized in that the connection establishment unit has a power supply condition generation circuit that transmits a control signal for instructing the power supply from the power supply device to the electronic device.

6. The power supply control device according to claim 5, characterized in that when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power for the power supply device, it has a plurality of different circuit patterns associated with each of the power supply conditions.

7. The power supply control device according to claim 5, characterized in that when the power supply condition generation circuit has a plurality of power supply conditions indicating the required power for the power supply device, the operation unit is configured to switch the power supply conditions in a preset order.

8. The power supply control device according to claim 1 or 2, characterized in that the connection establishment unit has a notification unit that indicates whether the control side CC terminal is in a connected state or a non-connected state.

9. The power supply control device according to claim 1 or 2, characterized in that the connection establishment unit has an inspection unit that detects the voltage supplied from the power supply device to the electronic device.

10. The power supply control device according to claim 1 or 2, characterized in that when the power supply device has a sleep function of turning off the power supply when the current is below a predetermined threshold current for a preset time or more, the connection establishment unit has a wake-up circuit that supplies a current exceeding the predetermined threshold current to the power supply device.

11. A control method for a power supply control device that turns on / off the power supply from a power supply device having a USB terminal of TYPE-C standard to an electronic device, The power supply device includes a connector electrically connected via the USB terminal, a connection establishment unit that controls the presence or absence of power supply from the power supply device to the electronic device, and an operation unit that switches the connection / disconnection of the connection establishment unit to the power supply device. The connector has a control-side CC terminal that is electrically connected to the power supply-side CC terminal of the power supply device. A control method for a power supply control device, characterized by including the following steps (a1) to (a3) and (b1) to (b3). Step (a1): Operating the operation unit to the ON state and electrically connecting the control-side CC terminal to the ground point via a predetermined pull-down resistor. Step (a2): Causing the power supply device to recognize that the electronic device is connected. Step (a3): Supplying power from the power supply device to the electronic device. Step (b1): Operating the operation unit to the OFF state and releasing the pull-down of the control-side CC terminal. Step (b2): Causing the power supply device to recognize that the electronic device has been removed. Step (b3): Stopping the power supply from the power supply device to the electronic device.

Images