TWI838845B - Power supply device and power supply determining method thereof - Google Patents

Abstract

A power supply device and a power supply determining method thereof are provided. A determining circuit, in response to a connection current provided by a power supply circuit to a electronic device being greater than a preset current, controls the power supply device to enter a power supply mode that meets a charging specification of the electronic device. The determining circuit, in response to the connection current provided by the power supply circuit to the electronic device being not greater than the preset current, controls the power supply device to enter a control mode in which the electronic device controls a display device to display.

Description

Power supply device and power supply determination method thereof

The present invention relates to an electronic device, and in particular to a power supply device and a power supply determination method thereof.

Generally, a projector has a USB port that can be used to connect to the display control unit of the projector and provide power to external devices. In existing designs, the design method of providing power to external devices is usually to directly connect the +5V voltage generated by the motherboard to the 5V pin output on the USB interface.

Usually, to ensure the safety of power supply, external devices connected to the USB interface will have certain protocol or voltage level requirements for the data signal pins (D+/D-) of the USB interface. However, the existing design directly connects the data signal pins of the USB interface to the display control unit of the projector, which cannot meet the protocol requirements or voltage level requirements of different external devices for the data signal pins of the USB interface, resulting in compatibility or inability to optimally adapt when providing power to different external devices.

The "Prior Art" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Prior Art" section may contain some knowledge that does not constitute the knowledge of the person with ordinary knowledge in the relevant technical field. The content disclosed in the "Prior Art" section does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it mean that it has been known or recognized by the person with ordinary knowledge in the relevant technical field before the application of the present invention.

The present invention provides a power supply device and a power supply determination method thereof, which can effectively solve the compatibility problem when the display device supplies power to the electronic device connected to it.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above purposes or other purposes, an embodiment of the present invention provides a power supply device, which is arranged on a display device. The power supply device includes a power supply circuit, a current detection circuit and a judgment circuit. The power supply circuit supplies power to an electronic device coupled to the power supply device. The current detection circuit detects the connection current provided by the power supply circuit to the electronic device, and judges whether the connection current is greater than a preset current. The judgment circuit couples the power supply circuit and the current detection circuit, responds that the connection current is greater than the preset current, controls the power supply device to enter a power supply mode that meets the charging specification of the electronic device, and responds that the connection current is not greater than the preset current, controls the power supply device to enter a control mode controlled by the electronic device and controls the display device to display.

In one embodiment of the present invention, in the power supply mode, the judgment circuit outputs a mode detection signal to the electronic device according to the charging specification of the electronic device, and the electronic device determines whether to supply power according to the mode detection signal.

In one embodiment of the present invention, the above-mentioned determination circuit includes a switching circuit and a mode detection signal generating circuit. The switching circuit is coupled to the current detection circuit. The mode detection signal generating circuit is coupled to the switching circuit to provide multiple detection signals. The switching circuit switches one of the above-mentioned multiple detection signals as a mode detection signal corresponding to the charging specification of the electronic device.

In one embodiment of the present invention, the above-mentioned determination circuit also includes a processing circuit, which couples the switching circuit and the current detection circuit, and controls the switching circuit to switch the electronic device to the mode detection signal generation circuit or the control circuit of the control display device according to the detection result of the current detection circuit.

In one embodiment of the present invention, the above-mentioned processing circuit also controls the switching circuit to detect the signal in the switching mode.

In one embodiment of the present invention, the above-mentioned processing circuit receives device information of the electronic device through a switching circuit, and compares the device information with the charging specification information stored in the processing circuit to determine the charging specification of the electronic device.

In one embodiment of the present invention, the above-mentioned electronic device is connected to a power supply device via a connector, and when the processing circuit does not store the charging specification information corresponding to the charging specification of the electronic device, it controls the switching circuit to short-circuit the positive data signal pin and the negative data signal pin of the connecting connector.

In one embodiment of the present invention, the above-mentioned multiple detection signals can be generated by adjusting the adjustable voltage signal.

The present invention also provides a power supply judgment method for a power supply device, wherein the power supply device is arranged on a display device, and the power supply device is used to supply power to an electronic device coupled to the power supply device, and the power supply device includes a power supply circuit, a current detection circuit, and a judgment circuit. The signal transmission method of the power supply device includes the following steps. The connection current provided to the electronic device is detected by the current detection circuit. Whether the connection current is greater than a preset current is judged by the current detection circuit. By judging that the circuit reacts that the connection current is greater than the preset current, the power supply device is controlled to enter a power supply mode that meets the charging specification of the electronic device. By judging that the circuit reacts that the connection current is not greater than the preset current, the power supply device is controlled to enter a control mode that is controlled by the electronic device and controls the display device to display.

In one embodiment of the present invention, the power supply determination method of the power supply device includes the following steps. In the power supply mode, the determination circuit outputs a mode detection signal to the electronic device according to the charging specification of the electronic device, and the electronic device determines whether to supply power according to the mode detection signal.

In one embodiment of the present invention, the above-mentioned judgment circuit includes a switching circuit and a mode detection signal generating circuit, and the power supply judgment method of the power supply device includes the following steps. The mode detection signal generating circuit provides multiple detection signals, and the switching circuit switches one of the above-mentioned multiple detection signals as a mode detection signal corresponding to the charging specification of the electronic device.

In one embodiment of the present invention, the above-mentioned judgment circuit also includes a processing circuit, and the power supply judgment method of the power supply device includes controlling the switching circuit to switch the electronic device to the mode detection signal generation circuit or the control circuit of the control display device according to the detection result of the current detection circuit by the processing circuit.

In one embodiment of the present invention, the power supply determination method of the power supply device includes controlling the switching circuit by a processing circuit to switch the mode detection signal.

In one embodiment of the present invention, the power supply determination method of the power supply device includes receiving device information of the electronic device through a processing circuit via a switching circuit, and comparing the device information with the charging specification information stored in the processing circuit to confirm the charging specification of the electronic device.

In one embodiment of the present invention, the above-mentioned electronic device is connected to a power supply device via a connector, and the power supply determination method of the power supply device includes, when the processing circuit does not store the charging specification information corresponding to the charging specification of the electronic device, the processing circuit controls the switching circuit to short-circuit the positive data signal pin and the negative data signal pin of the connection connector.

In one embodiment of the present invention, the above-mentioned multiple detection signals can be generated by adjusting the adjustable voltage signal.

Based on the above, the judgment circuit of the embodiment of the present invention can react that the connection current provided by the power supply circuit to the electronic device is greater than the preset current, and control the power supply device to enter a power supply mode that meets the charging specification of the electronic device, and react that the connection current provided by the power supply circuit to the electronic device is not greater than the preset current, and control the power supply device to enter a control mode that is controlled by the electronic device and controls the display device to display, thereby effectively solving the compatibility problem when the display device supplies power to the electronic device connected to it.

In order to make the above features and advantages of the present invention more clearly understood, the following is a detailed description of the embodiments with the accompanying drawings.

100: Power supply device

102: Power supply circuit

104: Current detection circuit

106: Judgment circuit

108: Electronic devices

I1: Connection current

R0~R3: resistance

202: Detection circuit

204: Switching circuit

206: Mode detection signal generating circuit

208: Control circuit

302: Processing circuit

C1, C2: capacitors

SW1~SW4: switch

PWM1, PWM2: pulse width modulation signal

D+: Positive data signal pin

D-: Negative data signal pin

S502~S508, S602~S608: Steps of power supply determination method of power supply device

Figure 1 is a schematic diagram of a power supply device according to an embodiment of the present invention.

Figure 2 is a schematic diagram of a power supply device according to another embodiment of the present invention.

Figure 3 is a schematic diagram of a power supply device according to another embodiment of the present invention.

Figure 4 is a schematic diagram of a switching circuit and a mode detection signal generating circuit according to an embodiment of the present invention.

Figure 5 is a flow chart of an object positioning method according to an embodiment of the present invention.

Figure 6 is a flow chart of an object positioning method according to another embodiment of the present invention.

The other technical contents, features and effects of the present invention mentioned above will be clearly presented in the detailed description of the preferred embodiment with reference to the following drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and are not used to limit the present invention.

FIG1 is a schematic diagram of a power supply device according to an embodiment of the present invention, please refer to FIG1. The power supply device 100 is disposed in a display device, such as a projection device or a liquid crystal display device, but is not limited thereto. Specifically, the power supply device is disposed in an electronic device having other main functions (such as display or calculation functions) (i.e., an electronic device whose main function is not a charging function). The power supply device 100 may include a power supply circuit 102, a current detection circuit 104, and a determination circuit 106. The determination circuit 106 is coupled to the power supply circuit 102 and the current detection circuit 104. The determination circuit 106 may be selectively coupled to an electronic device 108. The power supply circuit 102 can supply power to the electronic device 108 coupled to the power supply device 100 (power supply includes, for example, providing power or charging), wherein the electronic device 108 can be, for example, connected to the power supply device 100 through a connector (for example, a universal serial bus port, but not limited thereto), and the power supply circuit 102 pre-supplies, supplies power, or charges the electronic device 108 through a power line (for example, connected to one of the pins of the connector). The current detection circuit 104 can detect the connection current I1 (pre-power) provided by the power supply circuit 102 to the electronic device 108, and determine whether the connection current I1 is greater than a preset current. The current detection circuit 104, for example, transmits the determination result to the determination circuit 106. The judging circuit 106 can control the power supply device 100 to enter a power supply mode that meets the charging specification of the electronic device 108 when the connection current I1 is greater than the preset current, for example, to provide the power supply current to the electronic device 108, and control the power supply device 100 to enter a control mode when the connection current I1 is not greater than the preset current. Specifically, the current detecting circuit 104 can determine whether the electronic device 108 can be powered. In the power supply mode, the determination circuit 106 can determine the charging specification of the electronic device 108, and output a mode detection signal to the electronic device 108 according to the charging specification of the electronic device 108. The electronic device 108 can determine whether the power supply device 100 can supply power to the electronic device 108 according to the mode detection signal. The mode detection signal can include, for example, a positive data signal and a negative data signal provided by a positive data signal pin (D+) and a negative data signal pin (D-) of a universal serial bus interface, but is not limited thereto. In addition, in the control mode, the power supply device 100 can stop supplying power to the electronic device 108, and the electronic device 108 can control the display device to display. For example, the electronic device 108 is a media player, and the display device is a projection device. In the control mode, the electronic device 108 can transmit display data to the display control unit in the projection device for projection control through the universal serial bus port, so that the projection device projects according to the display data. In other embodiments, the power supply device 100 can supply power (or charge) and control the electronic device 108 at the same time.

In this way, the judging circuit 106 controls the power supply device 100 to enter the power supply mode or control mode according to the comparison result between the connection current I1 and the preset current, and provides a corresponding mode detection signal after confirming the charging specification of the electronic device 108. When the electronic device 108 has a charging demand, the power supply device 100 can provide power that meets the charging specification of the electronic device 108, effectively solving the compatibility problem when the display device supplies power to the electronic device connected to it.

Furthermore, the implementation of the power supply device 100 may be shown in FIG2. In the embodiment of FIG2, the current detection circuit 104 may include a resistor R0 and a detection circuit 202, wherein the resistor R0 is disposed on the power supply path of the power supply circuit 102 (e.g., connected to one of the pins of the connector, such as the 5V pin), and the detection circuit 202 may obtain the current value of the connection current I1 by detecting the voltage signal at both ends of the resistor R0, and determine whether the connection current I1 is greater than the preset current. The determination circuit 106 may include a switching circuit 204, a mode detection signal generating circuit 206, and optionally a control circuit 208. The switching circuit 204 couples the detection circuit 202, the power supply circuit 102, the mode detection signal generating circuit 206, the control circuit 208, and the electronic device 108. The switching circuit 204 may switch the mode detection signal generating circuit 206 or the control circuit 208 to the electronic device 108 according to the determination result of the detection circuit 202, so that the power supply device 100 enters the power supply mode or the control mode. The mode detection signal generating circuit 206 is used to provide multiple detection signals.

For example, when the connection current I1 is greater than the preset current, the switching circuit 204 switches the mode detection signal generating circuit 206 to connect to the electronic device 108, and switches and selects one of the multiple detection signals provided by the mode detection signal generating circuit 206 as the mode detection signal to be transmitted to the electronic device 108 in accordance with the charging specification of the electronic device 108. The electronic device 108 can judge that the power supply device 100 is a device that can be powered according to the above-mentioned mode detection signal. For another example, when the connection current I1 is not greater than the preset current, the switching circuit 204 switches the control circuit 208 to connect to the electronic device 108, so that the control circuit 208 can receive the display data from the electronic device 108 through the switching circuit 204, and control the display device to display according to the display data.

FIG3 is a schematic diagram of a power supply device according to another embodiment of the present invention. In this embodiment, the determination circuit 106 may further include a processing circuit 302, the switching circuit 204 is coupled to the power supply circuit 102, the processing circuit 302, the mode detection signal generating circuit 206, the control circuit 208 and the electronic device 108, and the processing circuit 302 is coupled to the detection circuit 202 of the current detection circuit 104.

The processing circuit 302 may be, for example, a microcontroller (MCU) or a system on chip (SoC), which may control the switching circuit 204 according to the detection result of the current detection circuit 104 to switch the electronic device 108 to the mode detection signal generating circuit 206 or the control circuit 208, so as to switch and select the detection signal provided by the mode detection signal generating circuit 206 as the mode detection signal and transmit the above-mentioned mode detection signal to the electronic device 108, or transmit the display data provided by the electronic device 108 to the control circuit 208. In addition, in this embodiment, the processing circuit 302 can store charging specification information (for example, including charging specifications and detection signals corresponding to multiple device information), and the processing circuit 302 can receive the device information of the electronic device 108 through the switching circuit 204, and compare the device information with the stored charging specification information to determine the charging specification of the electronic device 108.

In detail, after the processing circuit 302 receives the device information of the electronic device 108, when the processing circuit 302 stores the charging specification information corresponding to the charging specification of the electronic device 108, the charging specification of the electronic device 108 is determined, and the processing circuit 302 can control the switching circuit 204 to switch the corresponding mode detection signal (for example, the positive data signal pin and the negative data signal pin corresponding to the charging specification of the electronic device 108) to the electronic device 108 according to the charging specification of the electronic device 108. For example, if the electronic device 108 is an IPhone mobile phone, its charging specification requirements are: when the charging voltage/current is 5V/1A, the voltage of the positive data signal pin is required to be 2V, and the voltage of the negative data signal pin is 2.7V; when the charging voltage/current is 5V/2A, the voltage of the positive data signal pin is required to be 2.7V, and the voltage of the negative data signal pin is 2V. By timely switching the mode detection signal of the power supply device 100 of the present invention, the power supply circuit 102 can charge the IPhone mobile phone at full speed, rather than just reducing the specification for normal charging. If the electronic device 108 is a Samsung mobile phone, its charging specification requirements are: when the charging voltage/current is 5V/2A, the voltage of the positive data signal pin and the negative data signal pin are required to be 1.2V. The power supply device 100 of the present invention can also switch the mode detection signal in time to perform the most suitable charging (such as full-speed charging). Specifically, the power supply device 100 of the present case can provide the most suitable charging specification for electronic devices 108 with different charging specification requirements.

After the processing circuit 302 receives the device information of the electronic device 108, when the processing circuit 302 does not store the charging specification information corresponding to the charging specification of the electronic device 108, the processing circuit 302 can control the switching circuit 204 to short-circuit the positive data signal pin and the negative data signal pin of the connection connector. For example, when the electronic device 108 is a ChromeCast Dongle, it uses the USB BC1.2 charging specification, and the USB BC1.2 charging specification requires a short circuit between the positive data signal pin and the negative data signal pin. In some embodiments, the processing circuit 302 can also obtain updated information of the charging specification information through the network to ensure that the charging specification information stored in the processing circuit 302 can correspond to various types of electronic devices 108, and thus can provide corresponding mode detection signals.

Furthermore, FIG. 4 is a schematic diagram of a switching circuit and a mode detection signal generating circuit according to an embodiment of the present invention. Please refer to FIG. 3 and FIG. 4 simultaneously. The switching circuit 204 may include switches SW1~SW4, and the mode detection signal generating circuit 206 may include capacitors C1, C2 and resistors R1~R3. The first end of the switch SW1 is coupled to the positive data signal pin D+, the first end of the switch SW2 is coupled to the negative data signal pin D-, the capacitor C1 is coupled between the second end of the switch SW1 and the ground, the capacitor C2 is coupled between the second end of the switch SW2 and the ground, the resistor R1 is coupled to the second end of the switch SW1, the resistor R2 is coupled to the second end of the switch SW2, the first end of the switch SW3 is coupled to the positive data signal pin D+, the first end of the switch SW4 is coupled to the negative data signal pin D-, and the resistor R3 is coupled between the second end of the switch SW3 and the second end of the switch SW4. When the processing circuit 302 stores the charging specification information corresponding to the charging specification of the electronic device 108, the processing circuit 302 can control the switches SW1 and SW2 to be turned on, control the switches SW3 and SW4 to be turned off, and adjust the duty ratio of the pulse width modulation signals PWM1 and PWM2 (adjustable voltage signals) respectively connected to the resistors R1 and R2, so that the second ends of the switches SW1 and SW2 respectively generate the voltage level (i.e., the mode detection signal) corresponding to the charging specification of the electronic device 108. Specifically, multiple detection signals can be generated by adjusting the adjustable voltage signal (e.g., the pulse width modulation signals PWM1 and PWM2).

In some embodiments, the duty ratio of the pulse width modulation signals PWM1 and PWM2 can be adjusted to generate a voltage logic level signal to provide a 2-bit signal for the positive data signal pin D+ and the negative data signal pin D-. For example, by making the voltage on the positive data signal pin D+ and the negative data signal pin D- high or low, a signal with a state of "00", "01", "10" or "11" can be provided. In this way, by controlling the duty ratio of the pulse width modulation signals PWM1 and PWM2 to provide a mode detection signal corresponding to different charging specifications, the use of electronic components and design costs can be effectively reduced. In addition, in other embodiments, for example, the switches SW1 and SW2 may not be coupled to capacitors but to voltage divider circuits, and the voltage divider circuit may be controlled to provide a voltage divider voltage as a mode detection signal. In another embodiment, the second ends of the switches SW1 and SW2 may be directly connected to different working voltages, and the working voltages may be controlled to serve as mode detection signals. The implementation of the mode detection signal generating circuit 206 is not limited to the embodiment of FIG. 4. In other embodiments, the number of switches may not be limited to 4. Specifically, the number of switches of the switching circuit 204 may be greater than 4 to provide multiple detection signals (e.g., fixed voltages) to meet the requirements of the mode detection signal, for example, the second ends of some of the switches are floating or grounded.

In addition, when the processing circuit 302 does not store the charging specification information corresponding to the charging specification of the electronic device 108, the processing circuit 302 can control the switches SW1 and SW2 to be disconnected and the switches SW3 and SW4 to be turned on. In this way, when the electronic device 108 is a ChromeCast Dongle, the resistor R3 can respond to the test signal provided by the electronic device 108 and output a feedback signal as a mode detection signal to the electronic device 108, so that the electronic device 108 receives the power provided by the power supply circuit.

FIG5 is a flow chart of a power supply determination method of a power supply device according to an embodiment of the present invention. The power supply device is arranged in a display device and is used to supply power to an electronic device coupled to the power supply device. The power supply device includes a power supply circuit, a current detection circuit, and a determination circuit. As can be seen from the above embodiment, the power supply determination method of the power supply device may include the following steps. First, the connection current provided to the electronic device is detected by the current detection circuit (step S502), and then, the connection current is determined by the current detection circuit whether it is greater than a preset current (step S504). If the connection current is greater than the preset current, the power supply device is controlled to enter a power supply mode that meets the charging specification of the electronic device (step S506), and if the connection current is not greater than the preset current, the power supply device is controlled to enter a control mode that is controlled by the electronic device and controls the display device to display (step S508). In the power supply mode, the judgment circuit can output a mode detection signal to the electronic device according to the charging specification of the electronic device, and the electronic device can judge whether the power supply device can supply power according to the mode detection signal. Furthermore, the above-mentioned determination circuit may include, for example, a switching circuit and a mode detection signal generating circuit. The mode detection signal generating circuit may provide multiple detection signals, and the switching circuit may switch one of the multiple detection signals as a mode detection signal corresponding to the charging specification of the electronic device. The multiple detection signals may be, for example, adjustable voltage signals controlled by a pulse width modulation signal, and their voltage levels may be adjusted corresponding to the charging specification of the electronic device.

In some embodiments, the determination circuit may further include a processing circuit, and the processing circuit may control the switching circuit to switch the electronic device to the mode detection signal generating circuit or the control circuit of the control display device according to the detection result of the current detection circuit, so as to enter the power supply mode or the control mode. In addition, as shown in FIG6 , after step S506, the processing circuit may receive device information of the electronic device through the switching circuit, and compare the device information with the charging specification information stored in the processing circuit to confirm the charging specification of the electronic device (step S602). When the processing circuit stores charging specification information corresponding to the charging specification of the electronic device, the processing circuit can control the switching circuit and the mode detection signal generating circuit to provide a mode detection signal corresponding to the charging specification of the electronic device. For example, the switching circuit can be controlled to switch one of the multiple detection signals provided by the mode detection signal generating circuit as the mode detection signal, so as to charge according to the charging specification of the device information corresponding to the electronic device (step S604). In addition, the control circuit can control the display device to display the charging status in the power supply mode (step S606), such as displaying whether charging is completed or the power percentage, or displaying relevant warning information when the electronic device cannot be powered. In addition, when the processing circuit does not store the charging specification information corresponding to the charging specification of the electronic device, the processing circuit can control the power supply device to enter the default mode (for example, enter the power supply mode for USB BC 1.2, control the switching circuit to short-circuit the positive data signal pin and the negative data signal pin of the connector (for example, the universal serial bus port), but not limited to this), and can also update the charging specification information through the network or external device (step S608).

In summary, the judgment circuit of the embodiment of the present invention can react when the connection current provided by the power supply circuit to the electronic device is greater than the preset current, and control the power supply device to enter a power supply mode that meets the charging specification of the electronic device, and react when the connection current provided by the power supply circuit to the electronic device is not greater than the preset current, and control the power supply device to enter a control mode that is controlled by the electronic device and controls the display device to display, thereby effectively solving the compatibility problem when the display device supplies power to the electronic device connected thereto.

However, the above is only the preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention description of the present invention are still within the scope of the present invention. In addition, any embodiment or patent application scope of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract part and the title are only used to assist in the search of patent documents, and are not used to limit the scope of the rights of the present invention. Furthermore, the first, second, etc. mentioned in the specification are only used to indicate the name of the component, and are not used to limit the upper or lower limit of the number of components.

100: Power supply device

102: Power supply circuit

104: Current detection circuit

106: Judgment circuit

108: Electronic devices

I1: Connection current

Claims (16)

A power supply device, arranged on a display device, comprises: a power supply circuit, which supplies power to an electronic device coupled to the power supply device; a current detection circuit, which detects a connection current provided by the power supply circuit to the electronic device, and determines whether the connection current is greater than a preset current; and a determination circuit, which couples the power supply circuit and the current detection circuit, controls the power supply device to enter a power supply mode that meets the charging specification of the electronic device in response to the connection current being greater than the preset current, and controls the power supply device to enter a control mode that is controlled by the electronic device and controls the display device to display in response to the connection current being less than the preset current. A power supply device as described in claim 1, wherein in the power supply mode, the judgment circuit outputs a mode detection signal to the electronic device according to the charging specification of the electronic device, and the electronic device determines whether to supply power according to the mode detection signal. The power supply device as described in claim 1, wherein the determination circuit includes: a switching circuit coupled to the current detection circuit; and a mode detection signal generating circuit coupled to the switching circuit to provide multiple detection signals, wherein the switching circuit switches one of the detection signals as the mode detection signal corresponding to the charging specification of the electronic device. The power supply device as described in claim 3, wherein the judgment circuit further includes: A processing circuit, coupling the switching circuit and the current detection circuit, and controlling the switching circuit to switch the electronic device to the mode detection signal generating circuit or a control circuit that controls the display device according to the detection result of the current detection circuit. A power supply device as described in claim 4, wherein the processing circuit also controls the switching circuit to switch the mode detection signal. A power supply device as described in claim 4, wherein the processing circuit receives device information of the electronic device through the switching circuit, and compares the device information with charging specification information stored in the processing circuit to determine the charging specification of the electronic device. A power supply device as described in claim 6, wherein the electronic device is connected to the power supply device via a connector, and when the processing circuit does not store charging specification information corresponding to the charging specification of the electronic device, the switching circuit is controlled to short-circuit a positive data signal pin and a negative data signal pin of the connector. A power supply device as described in claim 3, wherein the detection signals can be generated by adjusting an adjustable voltage signal. A power supply determination method for a power supply device, the power supply device is arranged on a display device and is used to supply power to an electronic device coupled to the power supply device. The power supply device includes a power supply circuit, a current detection circuit and a determination circuit. The signal transmission method of the power supply device includes: Detecting a connection current provided to the electronic device by the current detection circuit; Determining whether the connection current is greater than a preset current by the current detection circuit; Controlling the power supply device to enter a power supply mode that meets the charging specification of the electronic device by the determination circuit in response to the connection current being greater than the preset current; and By the judgment circuit reacting that the connection current is not greater than the preset current, the power supply device is controlled to enter a control mode controlled by the electronic device and the display device is controlled to display. The power supply determination method of the power supply device as described in claim 9 includes: In the power supply mode, the determination circuit outputs a mode detection signal to the electronic device according to the charging specification of the electronic device, and the electronic device determines whether to supply power according to the mode detection signal. The power supply determination method of the power supply device as described in claim 9, wherein the determination circuit includes a switching circuit and a mode detection signal generating circuit, and the power supply determination method of the power supply device includes: The mode detection signal generating circuit provides multiple detection signals, and the switching circuit switches one of the detection signals as the mode detection signal corresponding to the charging specification of the electronic device. The power supply determination method of the power supply device as described in claim 11, wherein the determination circuit further includes a processing circuit, and the power supply determination method of the power supply device includes: The processing circuit controls the switching circuit according to the detection result of the current detection circuit to switch the electronic device to the mode detection signal generating circuit or a control circuit that controls the display device. The power supply determination method of the power supply device as described in claim 12 includes: Controlling the switching circuit by the processing circuit to switch the mode detection signal. The power supply determination method of the power supply device as described in claim 12 includes: The processing circuit receives device information of the electronic device through the switching circuit, and compares the device information with the charging specification information stored in the processing circuit to confirm the charging specification of the electronic device. A power supply determination method for a power supply device as described in claim 14, wherein the electronic device is connected to the power supply device via a connector, and the power supply determination method for the power supply device comprises: When the processing circuit does not store charging specification information corresponding to the charging specification of the electronic device, the processing circuit controls the switching circuit to short-circuit a positive data signal pin and a negative data signal pin of the connector. A power supply determination method for a power supply device as described in claim 11, wherein the detection signals can be generated by adjusting an adjustable voltage signal.

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