TWI759836B - Voltage input device and power supplying method - Google Patents

Abstract

A voltage input device includes an input circuit, an output circuit, a switch and a voltage detecting circuit. The input circuit is configured to couple a DC power terminal and configured to receive a first voltage signal when the input circuit is coupled to the DC power terminal. The output circuit is coupled to an apparatus and configured to transmit a second voltage signal to the apparatus according to the first voltage signal when the output circuit is coupled to the input circuit. The switch is configured to couple the input circuit to the output circuit when the switch is turned on and configured to decouple the input circuit from the output circuit when the switch is turned off. The voltage detecting circuit is configured to detect a voltage value of the first voltage signal when the DC power terminal is coupled to the input circuit, and configured to turn on or turn off the switch according to the voltage value. A power supplying method is also disclosed herein.

Description

Voltage input device and power supply method

The present invention relates to a voltage signal input technology, in particular to a voltage input device and a power supply method.

Generally speaking, users may not notice the sequence in which the power transmission device (such as a power cord) is coupled to the electronic device and the power supply (such as a socket) when operating the electronic device. For example, the user may first plug the alternating current (AC) power end (eg, a plug) of the power transmission device into the socket, and then couple the direct current (DC) power end of the power transmission device to the electronic equipment. However, when the AC power terminal of the power transmission device is first coupled to the power supply, and then the DC power terminal is coupled to the electronic device to be driven, an inrush current will be generated. Inrush current can easily cause damage to the internal components of electronic equipment. Therefore, how to develop related technologies that can overcome the above problems is an important issue in the field.

An embodiment of the present invention discloses a voltage input device including an input circuit, an output circuit, a switch and a voltage detection circuit. The input circuit is used for being coupled to the DC power terminal, and used for receiving the first voltage signal when the input circuit is coupled to the DC power terminal. The output circuit is coupled to the device, and is used for transmitting the second voltage signal to the device according to the first voltage signal when the output circuit is coupled to the input circuit. The switch is used to couple the input circuit to the output circuit when it is turned on, and is used to disconnect the input circuit from the output circuit when it is turned off. The voltage detection circuit is used for detecting the voltage value of the first voltage signal when the DC power supply terminal is coupled to the input circuit, and turns on or off the switch according to the voltage value.

Another embodiment of the present invention discloses a power supply method, comprising: coupling a DC power terminal to an input circuit; detecting a voltage value before the DC power terminal is coupled to the input circuit; when the voltage value is less than or equal to a When the voltage value is preset, the input circuit is coupled to an output circuit; when the input circuit is coupled to the output circuit, a device is powered through the output circuit according to a voltage signal of the DC power supply terminal.

In this document, when an element is referred to as being "connected" or "coupled," it may be referred to as "electrically connected" or "electrically coupled." "Connected" or "coupled" may also be used to indicate the cooperative operation or interaction between two or more elements. In addition, although terms such as "first", "second", . . . are used herein to describe different elements, the terms are only used to distinguish elements or operations described by the same technical terms. Unless clearly indicated by the context, the terms do not specifically refer to or imply a sequence or sequence and are not intended to limit the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed as having meanings consistent with their meanings in the context of the related art and the present invention, and are not to be construed as idealized or excessive Formal meaning, unless expressly defined as such herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms including "at least one" unless the content clearly dictates otherwise. "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will also be understood that, when used in this specification, the terms "comprising" and/or "comprising" designate the stated feature, region, integer, step, operation, presence of an element and/or part, but do not exclude one or more The presence or addition of other features, entireties of regions, steps, operations, elements, components, and/or combinations thereof.

Several embodiments of the present case will be disclosed in the following figures. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the present case. That is, in some embodiments of the present disclosure, these practical details are unnecessary. In addition, for the purpose of simplifying the drawings, some well-known structures and elements will be shown in a simple and schematic manner in the drawings.

FIG. 1 is a functional block diagram of a voltage input device, a power transmission device, and a device according to an embodiment of the present application. As shown in FIG. 1 , the device 120 is coupled to the voltage input device 122 . The power transmission device 110 is used for receiving the voltage from the power supply 190, and transmitting the voltage to the device 120 through the voltage input device 122, so that the device 120 can operate according to the transmitted voltage.

As shown in FIG. 1 , the power transmission device 110 includes an alternating current (AC) power terminal 112 and a direct current (DC) power terminal 114 .

In some embodiments, the AC power terminal 112 is coupled to the power supply 190 and converts the AC voltage provided by the power supply 190 into a DC voltage signal DS1 . In some embodiments, the AC power terminal 112 includes a plug and/or an adapter. In some embodiments, the power supply 190 includes an outlet.

In some embodiments, the DC power terminal 114 is coupled to the voltage input device 122 . When the DC power terminal 114 is coupled to the voltage input device 122 , the DC power terminal 114 is used to transmit the DC voltage signal DS1 to the voltage input device 122 , so that the voltage input device 122 transmits the power from the power supply 190 to the device 120 . In some embodiments, the DC power terminal 114 includes wires and/or adapters for coupling to the voltage input device 122 .

In some embodiments, the voltage input device 122 is used to receive the DC voltage signal DS1 from the DC power supply terminal 114 , and transmit the voltage signal S5 to the device 120 according to the DC voltage signal DS1 , so that the power supply 190 inputs the voltage through the power transmission device 110 and Device 122 supplies power to device 120 .

In some embodiments, the voltage input device 122 is further used to detect the voltage value VDS1 of the DC power terminal 114 . In some embodiments, the voltage value VDS1 is the voltage value of the DC power terminal 114 when the DC power terminal 114 is coupled to the voltage input device 122 . In some other embodiments, the voltage value VDS1 is the voltage value of the DC power terminal 114 before the DC power terminal 114 is coupled to the voltage input device 122 .

In some embodiments, when the voltage value VDS1 is higher than the predetermined voltage value VPD, the voltage input device 122 is used to disconnect the DC power terminal 114 from the device 120 . When the voltage value VDS1 is lower than or equal to the preset voltage value VPD, the voltage input device 122 is used for coupling the DC power terminal 114 and the device 120 , so that the power supply 190 can perform the operation on the device 120 through the DC power terminal 114 and the voltage input device 122 . powered by. In some embodiments, the preset voltage value VPD is zero volts.

For example, when the voltage value VDS1 is higher than the predetermined voltage value VPD, the voltage input device 122 disconnects the DC power terminal 114 from the device 120 so that the DC voltage signal DS1 does not affect the device 120 . Conversely, when the voltage value VDS1 is lower than or equal to the preset voltage value VPD, the DC power supply terminal 114 and the device 120 are coupled to each other through the voltage input device 122, and the voltage input device 122 transmits the voltage signal S5 to the device 120 according to the DC voltage signal DS1, Causes device 120 to be powered.

In some prior methods, in the case that the DC power terminal has a voltage higher than the predetermined voltage value, when the DC power terminal is coupled to the device, an inrush current will be generated. Inrush current entering the device can damage the components inside the device.

Compared with the above method, in the embodiment of the present invention, the voltage input device 122 monitors the voltage value VDS1 of the DC power terminal 114, and when the voltage value VDS1 is too high, the voltage input device 122 disconnects the DC power terminal 114 from the device 120. connected to avoid inrush current entering the device 120 and causing damage to the device 120 .

In some embodiments, after the DC power terminal 114 is coupled to the device 120, even if the DC voltage signal DS1 is pulled up to be higher than the preset voltage value VPD, no inrush current will be generated. Therefore, in some embodiments, after the DC power terminal 114 is coupled to the device 120 and the voltage value VDS1 is higher than the predetermined voltage value VPD, the voltage input device 122 is further configured to continuously maintain the coupling between the DC power terminal 114 and the device 120 In the connected state, the device 120 is powered according to the voltage value VDS1 higher than the preset voltage value VPD. The following is a detailed description of an operation example.

For example, first, the AC power terminal 112 is coupled to the power supply 190 . At this time, the voltage value VDS1 of the DC power supply terminal 114 is higher than the predetermined voltage value VPD. Next, the DC power terminal 114 is coupled to the voltage input device 122 . At this time, the voltage input device 122 detects that the voltage value VDS1 is higher than the predetermined voltage value VPD, and disconnects the DC power terminal 114 from the device 120 . Next, disconnect the AC power terminal 112 from the power supply 190 (eg, the user pulls out the plug of the AC power terminal 112 from the socket of the power supply 190 ). At this time, the voltage value VDS1 of the DC power supply terminal 114 is less than or equal to the preset voltage value VPD. The voltage input device 122 detects that the voltage value VDS1 is less than or equal to the predetermined voltage value VPD, and is coupled to the DC power terminal 114 and the device 120 . Next, the AC power terminal 112 is coupled to the power supply 190 again (eg, the user inserts the plug of the AC power terminal 112 into the socket of the power supply 190 ). At this time, the voltage value VDS1 of the DC power terminal 114 is higher than the predetermined voltage value VPD, and the voltage input device 122 continues to maintain the coupling state of the DC power terminal 114 and the device 120 .

In this way, in the above example, even when the voltage value VDS1 is pulled up to be higher than the predetermined voltage value VPD, the voltage input device 122 still maintains the coupling state between the DC power terminal 114 and the device 120 , so that the power supply 190 uses The device 120 is powered by a DC voltage signal DS1 having a voltage value VDS1 higher than a preset voltage value VPD.

In some embodiments, power switch 124 is a power switch for device 120 . When the power switch 124 is turned on, the device 120 is turned on, and when the power switch 124 is turned off, the device 120 is turned off. In a further embodiment, when the voltage input device 122 of the coupling device 120 is not coupled to the DC power terminal 114, the normal state of the power switch 124 is OFF.

However, in some cases, when the voltage input device 122 is not coupled to the DC power terminal 114 , the power switch 124 is turned on, which may cause the device 120 to malfunction. Therefore, in order to solve the above problem, in the embodiment of the present application, when the voltage input device 122 is not coupled to the DC power terminal 114 and the power switch 124 is turned on, the voltage input device 122 is used to disconnect the DC power terminal 114 from the device 120 to avoid Device 120 exception.

FIG. 2 is a specific functional block diagram of the voltage input device shown in FIG. 1 according to an embodiment of the present application. As shown in FIG. 2 , the voltage input device 122 includes an input circuit 202 , a switch detection circuit 204 , a switch 206 , a voltage detection circuit 208 and an output circuit 210 . The switch detection circuit 204 , the switch 206 and the voltage detection circuit 208 are coupled in series between the input circuit 202 and the output circuit 210 , but the embodiment of the present invention is not limited thereto.

In some embodiments, when the switch detection circuit 204 , the switch 206 and the voltage detection circuit 208 are all turned on, the input circuit 202 is coupled to the output circuit 210 through the switch detection circuit 204 , the switch 206 and the voltage detection circuit 208 . In other words, when the input circuit 202 is coupled to the output circuit 210 , the voltage input device 122 transmits the received DC voltage signal through the input circuit 202 , the switch detection circuit 204 , the switch 206 , the voltage detection circuit 208 and the output circuit 210 . DS1 is converted into a voltage signal S5 and transmitted to the device 120 to power the device 120 . Conversely, when the input circuit 202 is disconnected from the output circuit 210 , the device 120 will not receive the voltage signal S5 , in other words, the device 120 will not be powered by the voltage input device 122 .

In some embodiments, the input circuit 202 is coupled to the DC power supply terminal 114 to receive the DC voltage signal DS1 and to transmit the voltage signal S1 to the switch detection circuit 204 according to the DC voltage signal DS1 .

In some embodiments, the switch detection circuit 204 is used to detect the coupling state of the input circuit 202 and the DC power terminal 114 , and to transmit the voltage signal S2 according to the voltage signal S1 when the input circuit 202 is normally coupled to the DC power terminal 114 to switch 206. In some embodiments, the switch detection circuit 204 does not transmit the voltage signal S2 to the switch 206 when the coupling condition between the DC power terminal 114 and the input circuit 202 is abnormal (eg, poor contact). In some other embodiments, when the coupling state between the DC power terminal 114 and the input circuit 202 is abnormal, the switch detection circuit 204 is used to turn off the switch 206, so that the input circuit 202 is disconnected from the output circuit 210, so as to avoid the When the voltage input device 122 is abnormal, the signal S5 is transmitted to the device 120 .

In some embodiments, the switch detection circuit 204 is further used to detect whether the power switch 124 of the device 120 is abnormal, and disconnect the input circuit 202 and the output circuit 210 when the power switch 124 is abnormal.

For example, in some embodiments, when the voltage input device 122 of the coupling device 120 is not coupled to the DC power terminal 114, the normal state of the power switch 124 is turned off. Therefore, when the input circuit 202 is not coupled to the DC power terminal 114 and the power switch 124 is turned on, the switch detection circuit 204 can determine that the power switch 124 is abnormal. In some embodiments, when the power switch 124 is abnormal, the switch detection circuit 204 is used to turn off the switch 206, so that the input circuit 202 and the output circuit 210 are disconnected, and no voltage signal S5 is generated and transmitted to the abnormality device 120 to avoid further affecting the device 120 .

In some embodiments, the switch 206 is configured to be turned on or off by the switch detection circuit 204 and/or the voltage detection circuit 208 . In some embodiments, the input circuit 202 is coupled to the output circuit 210 when the switch 206 is turned on, and the input circuit 202 is disconnected from the output circuit 210 when the switch 206 is turned off. In some embodiments, when the switch 206 is turned on, the voltage signal S3 is transmitted to the voltage detection circuit 208 through the switch 206 according to the voltage signal S2. In some embodiments, the voltage signal S3 is substantially identical to the voltage signal S2. In some embodiments, switch 206 is a relay switch or other type of switch.

In some embodiments, the voltage detection circuit 208 is used to detect the voltage value VDS1 of the DC voltage signal DS1, and turn on or turn off the switch 206 according to the voltage value VDS1. In some embodiments, the voltage value VDS1 is the voltage value when the DC power terminal 114 is coupled to the input circuit 202 . In some embodiments, the voltage value VDS1 is the voltage value that the DC power terminal 114 has before being coupled to the input circuit 202 .

In some embodiments, when the voltage value VDS1 is higher than the predetermined voltage value VPD, the voltage detection circuit 208 is used to turn off the switch 206 to disconnect the input circuit 202 and the output circuit 210 . When the voltage value VDS1 is lower than or equal to the predetermined voltage value VPD, the voltage detection circuit 208 is used to turn on the switch 206 to couple the input circuit 202 and the output circuit 210 , so that the device 120 is powered by the voltage input device 122 .

In some embodiments, after the DC power terminal 114 is coupled to the input circuit 202 and the voltage value VDS1 is higher than the predetermined voltage value VPD, the voltage detection circuit 208 is used to continuously turn on the switch 206 so that the input circuit 202 is continuously coupled output circuit 210 . In this way, the voltage input device 122 can enable the device 120 to continue to be powered according to the voltage value VDS1 higher than the predetermined voltage value VPD. The following is a detailed description of an operation example.

For example, first, the AC power terminal 112 is disconnected from the power supply 190 , so that the voltage value VDS1 of the DC power terminal 114 is lower than the predetermined voltage value VPD. Next, the DC power terminal 114 is coupled to the input circuit 202 . At this time, the voltage detection circuit 208 detects that the voltage value VDS1 is lower than the predetermined voltage value VPD, and turns on the switch 206 . Next, the AC power terminal 112 is coupled to the power supply 190 , so that the voltage value VDS1 of the DC power terminal 114 is increased to be higher than the predetermined voltage value VPD. At this time, the voltage detection circuit 208 continues to turn on the switch 206 to continuously couple the input circuit 202 and the output circuit 210, so that the device 120 is powered according to the voltage value VDS1 higher than the predetermined voltage value VPD.

In some embodiments, after the switch 206 is turned off and the voltage value VDS1 is lower than the predetermined voltage value VPD, the voltage detection circuit 208 turns on the switch 206 to couple the input circuit 202 and the output circuit 210 . In this way, after the AC power terminal 112 disconnects the power supply 190 , and then re-couples the AC power terminal 112 and the power supply 190 , the device 120 can be powered by the voltage input device 122 . The following is a detailed description of an operation example.

For example, first, the AC power terminal 112 is coupled to the power supply 190 (for example, the plug of the AC power terminal 112 is inserted into the socket of the power supply 190 ), so that the voltage value VDS1 of the DC power terminal 114 is higher than the predetermined voltage value VPD. Next, when the DC power terminal 114 is coupled to the input circuit 202 , the voltage detection circuit 208 detects that the voltage value VDS1 is higher than the predetermined voltage value VPD, and turns off the switch 206 . At this time, the input circuit 202 is disconnected from the output circuit 210 . Next, after the DC power terminal 114 is coupled to the input circuit 202, the AC power terminal 112 is disconnected from the power supply 190 (eg, unplug the AC power terminal 112 from the socket of the power supply 190), so that the voltage value VDS1 is reduced to lower than the preset voltage value VPD. At this time, the voltage detection circuit 208 detects that the voltage value VDS1 is lower than or equal to the predetermined voltage value VPD, so the voltage detection circuit 208 turns on the switch 206 . At this time, the input circuit 202 is coupled to the output circuit 210 . Next, the AC power terminal 112 is coupled to the power supply 190 again (eg, the plug of the AC power terminal 112 is re-plugged into the socket of the power supply 190 ), so that the voltage value VDS1 is increased to be higher than the predetermined voltage value VPD. At this time, the voltage detection circuit 208 continues to turn on the switch 206 to continuously couple the input circuit 202 and the output circuit 210, so that the device 120 is powered according to the voltage value VDS1 higher than the predetermined voltage value VPD.

In some embodiments, the voltage detection circuit 208 is used to transmit the voltage signal S4 to the output circuit 210 according to the voltage signal S3 when the switch 206 is turned on. In some embodiments, when the switch 206 is turned on, the voltage value of the voltage signal S4 is substantially the same as the voltage value VDS1 of the DC power supply terminal 114 .

As mentioned above, in some embodiments, the voltage detection circuit 208 is used to ensure that when the input circuit 202 is coupled to the DC power terminal 114, the voltage value VDS1 is lower than or equal to the predetermined voltage value VPD, so as to reduce the excessive voltage caused by the voltage value VDS1. high inrush current. Since the input circuit 202 is coupled to the DC power supply terminal 114, no inrush current will be generated even if the voltage value VDS1 increases. Therefore, in some embodiments, after the input circuit 202 is coupled to the DC power terminal 114 , the voltage detection circuit 208 is used to maintain the coupling state of the input circuit 202 and the output circuit 210 , so that the device 120 is based on a voltage higher than the predetermined voltage value. The voltage value VDS1 of the VPD is supplied.

In some embodiments, the output circuit 210 is configured to transmit the voltage signal S5 to the device 120 according to the voltage signal S4. In some embodiments, when the input circuit 202 is coupled to the output circuit 210 , the voltage value VDS1 of the DC voltage signal DS1 is substantially the same as the voltage value of the voltage signals S1 - S5 .

In the embodiment of the present invention, the configuration of the input circuit 202 , the switch detection circuit 204 , the switch 206 , the voltage detection circuit 208 and the output circuit 210 is not limited to the above-mentioned embodiment. Other configurations of the input circuit 202 , the switch detection circuit 204 , the switch 206 , the voltage detection circuit 208 and the output circuit 210 are also within the scope of this application.

FIG. 3 is a flow chart of a power supply method according to an embodiment of the present application. As shown in FIG. 3 , the power supply method 300 includes operations 302 , 304 , 306 , 312 , 322 , 324 , 332 and 334 . In some embodiments, the power supply method shown in FIG. 3 is applied to the power input device 122 , the power transmission device 110 , and the device 120 shown in FIG. 2 and/or FIG. 1 .

For the purpose of illustration, the following description of the power supply method 300 uses the voltage input device 122 , the power transmission device 110 , and the device 120 described in FIGS. 1 and 2 as examples, but the embodiments of the present invention are not limited thereto.

As shown in FIG. 3 , powering method 300 begins with operation 302 . After operation 302, operation 304 is performed. At operation 304 , the DC power terminal 114 is coupled to the input circuit 202 . After operation 304, operation 306 is performed. In operation 306, the voltage detection circuit 208 detects the voltage value VDS1 of the DC power terminal 114, and compares the voltage value VDS1 with the predetermined voltage value VPD. After operation 304, operation 312 or operation 322 is performed according to the comparison result between the voltage value VDS1 and the preset voltage value VPD.

As shown in FIG. 3 , if the voltage value VDS1 is lower than or equal to the predetermined voltage value VPD, operation 312 is performed. In operation 312 , the switch detection circuit 204 detects the coupling status of the input circuit 202 and the DC power terminal 114 . If the DC power terminal 114 is normally coupled to the input circuit 202 , the switch detection circuit 204 is coupled to the input circuit 202 and the output circuit 210 , so that the power supply 190 supplies power to the device 120 through the voltage input device 122 . On the contrary, in some embodiments, if the coupling condition between the DC power supply terminal 114 and the input circuit 202 is abnormal, the switch detection circuit 204 disconnects the input circuit 202 and the output circuit 210 to prevent the DC voltage signal DS1 from passing through an abnormal transmission at the coupling.

As shown in FIG. 3 , if the voltage value VDS1 is higher than the preset voltage value VPD, operation 322 is performed. At operation 322 , the voltage detection circuit 208 turns off the switch 206 to disconnect the input circuit 202 and the output circuit 210 . After operation 322, operation 324 is performed.

In operation 324, the AC power terminal 112 is disconnected from the power supply 190, so that the voltage value VDS1 is reduced to be lower than or equal to the preset voltage value VPD. At this time, the voltage detection circuit 208 turns on the switch 206 to couple the input circuit 202 and the output circuit 210 .

After operation 312 or operation 324, operation 332 is performed. In operation 332 , the AC power terminal 112 is coupled to the power supply 190 . At this time, the voltage value VDS1 of the DC power supply terminal 114 is raised to be higher than the predetermined voltage value VPD, and the input circuit 202 and the output circuit 210 are continuously coupled to each other. In this way, through the voltage input device 122 , the DC voltage signal DS1 is converted into a voltage signal S5 to supply power to the device 120 according to the voltage value VDS1 higher than the predetermined voltage value VPD.

As shown in FIG. 3 , powering method 300 ends at operation 334 following operation 332 . At this time, the voltage input device 122 transmits the voltage signal S5 to the device 120 according to the DC voltage signal DS1 , so that the power supply 190 continues to supply power to the device 120 through the power transmission device 110 and the voltage input device 122 .

To sum up, in the embodiment of the present invention, the voltage input device 122 monitors the voltage value VDS1 of the DC power terminal 114, and disconnects the DC power terminal 114 from the device 120 when the voltage value VDS1 is too high. In this way, it is possible to avoid inrush current input to the device 120 due to the high voltage value VDS1 , so as to reduce the component consumption of the device 120 . In some embodiments, the voltage input device 122 is further configured to turn off the voltage input device 122 when the power switch 124 of the device 120 is abnormally turned on, for example, when the device 120 is not coupled to the DC power terminal 114 but the power switch 124 is turned on. Turn on the DC power terminal 114 and the device 120 to prevent the voltage signal S5 from being input to the device 120 and further affecting the device 120 . In addition, compared with some previous methods, in some embodiments, it takes less time for the voltage value of the voltage signal S5 to rise from less than or equal to the predetermined voltage value VPD to higher than the predetermined voltage value VPD.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

110: Power Delivery Devices 120: Equipment 112: AC power terminal 114: DC power terminal 190: Power Supply DS1: DC voltage signal 122: Voltage input device 124: Power switch S1~S5: Voltage signal VDS1: Voltage value VPD: Default voltage value 202: Input circuit 204: Switch detection circuit 206: Switch 208: Voltage detection circuit 210: Output circuit 300: Power supply method 302, 304, 306, 312, 322, 324, 332, 334: Operation

FIG. 1 is a functional block diagram of a voltage input device, a power transmission device, and a device according to an embodiment of the present application. FIG. 2 is a specific functional block diagram of the voltage input device shown in FIG. 1 according to an embodiment of the present application. FIG. 3 is a flow chart of a power supply method according to an embodiment of the present application.

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110: Power Delivery Devices 120: Equipment 112: AC power terminal 114: DC power terminal 190: Power Supply DS1: DC voltage signal 122: Voltage input device 124: Power switch S1~S5: Voltage signal 202: Input circuit 204: Switch detection circuit 206: Switch 208: Voltage detection circuit 210: Output circuit

Claims (10)

A voltage input device, comprising: an input circuit for coupling to a DC power supply terminal and for receiving a first voltage signal when the input circuit is coupled to the DC power supply terminal; an output circuit for coupling to a device and using When the output circuit is coupled to the input circuit, a second voltage signal is transmitted to the device according to the first voltage signal; a switch is used for coupling the input circuit to the output circuit when it is turned on, and used for turning off When the input circuit is disconnected from the output circuit; and a voltage detection circuit is used to detect the first voltage signal when the DC power terminal is coupled to the input circuit, and turn on or off according to the first voltage signal The switch is turned off, and the switch is continuously turned on after the switch is turned on and a voltage value of the first voltage signal is higher than a predetermined voltage value. The voltage input device of claim 1, comprising: a switch detection circuit for detecting a coupling condition between the input circuit and the DC power terminal, and for detecting the input circuit when the coupling condition is abnormal disconnected from this output circuit. The voltage input device according to claim 2, wherein the switch detection circuit is further used for detecting whether a power switch of the equipment is turned on, and used for when the power switch is turned on and the input circuit is disconnected from the DC power terminal , disconnect the input circuit from the output circuit. The voltage input device of claim 1, wherein the voltage detection circuit is further configured to, before the input circuit is coupled to the DC power terminal and a voltage value of the first voltage signal is higher than a predetermined voltage value, Turn off this switch. The voltage input device of claim 1, wherein the voltage detection circuit is further configured to turn on the switch after the switch is turned off and the voltage value of the first voltage signal is less than or equal to the predetermined voltage value. The voltage input device of claim 1, wherein the voltage detection circuit is further used for when the input circuit is coupled to the DC power terminal and a voltage value of the first voltage signal is less than or equal to a predetermined voltage value , turn on the switch. A power supply method, comprising: coupling a DC power terminal to an input circuit; detecting a voltage value before the DC power terminal is coupled to the input circuit; when the voltage value is less than or equal to a predetermined voltage value, coupling The input circuit is connected to an output circuit; when the input circuit is coupled to the output circuit, power is supplied to a device through the output circuit according to a voltage signal of the DC power terminal; and after the DC power terminal is coupled to the input circuit and the When the voltage value is higher than the preset voltage value, the input circuit is continuously coupled to the output circuit. The power supply method according to claim 7, further comprising: detecting whether a power switch of the device is turned on; and disconnecting the input circuit when the power switch is turned on and the input circuit is electrically disconnected from the DC power terminal with this output circuit. The power supply method according to claim 7, further comprising: when the voltage value is higher than the predetermined voltage value and the DC power terminal is coupled to the input circuit, disconnecting the input circuit and the output circuit. The power supply method of claim 7, further comprising: coupling the input circuit to the output circuit after the DC power terminal is coupled to the input circuit and when the voltage value is less than the predetermined voltage value.

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