TWI460938B - Complex connector for handheld device and connecting method therefore - Google Patents

Description

Composite connector of handheld device and device connection method thereof

The present invention relates to a connector for a handheld device, and more particularly to a handheld device capable of supplying power to a handheld device and an earphone when the handheld device, the earphone and the computer device are connected to each other, and performing data exchange with the handheld device. The composite connector of the device and the connection method thereof.

Please refer to FIG. 1 for a schematic circuit diagram of a prior art Y-connector. The connector includes a charging port 111, a headphone port 112, a cell phone port 113 and an oscillating circuit 120. Each of the ports is electrically coupled to the oscillating circuit 120 through a signal transmission circuit 130. The signal transmission circuit 130 includes five circuit connections to be connected to the respective ports. The first line is a power transmission line (VBus) 131, and the second line and the third line are data transmission lines (Data Bus, D+ and D-) 132, the fourth line is the device identification line (ID-Pin) 133, and the fifth line is the ground line (GND-Pin). A driving circuit is disposed between the oscillating circuit 120 and the power transmission line 131, and the oscillating circuit 120 is further connected to the fourth line of a part of the circuit between the mobile phone connection port 113 and the earphone port 112.

The Y-connector of the prior art has a plurality of working modes: (1) the mobile phone is connected to the mobile phone connection port 113, and the earphone is connected to the earphone connection port 112, so that the mobile phone is electrically connected to the earphone through the signal transmission circuit 130, and the earphone is powered and Transfer audio material. (2) In addition to electrically coupling the mobile phone and the earphone, the charging port 111 is further connected to a charger, and the second line D- and the third line D+ of the connection signal transmission circuit 130 are connected by the charger. The field effect transistor Q1 is turned on, and the oscillation circuit 120 is connected to the power transmission line 131 to obtain power supply thereof to generate a pulse signal on the device identification line 133 through the path and the open circuit of the control field effect transistor Q2. When the mobile phone detects the pulse signal, it determines that it has been electrically coupled with the charger, and the earphone and the mobile phone obtain the power supply of the charger through the power transmission line 131, and the mobile phone can perform the charging behavior. However, at present, the manufacturer has manufactured a Y-type connector that can simultaneously operate a mobile phone to transmit audio data to a headset, and can connect a charger or a computer device to charge a mobile phone and a headset. However, when the charging port 111 is connected to a computer device, although the power supply of the computer device can be obtained, the mobile phone cannot effectively identify the computer device, and the data transmission and exchange with the computer device cannot be performed, that is, the computer device transmission cannot be performed synchronously. Mobile phone data exchange, mobile phone output audio data to headphones, and computer equipment power supply to mobile phones and headsets and other diversified functions.

The problem to be solved by the present invention is to provide a handheld device connector capable of data exchange or transmission behavior between a computer device and a handheld device when the computer device supplies power to the handheld device and the earphone, and a device connection method in which the connector is combined with the handheld device.

The technical means of the handheld device connector for solving the above problems is to provide a composite connector of a handheld device for simultaneously connecting a headset, a handheld device, a charger and a computer device with a serial connection, the composite The connector comprises: an oscillating circuit, a composite port, a headphone port, a hand-held device port and a signal transmission circuit, and each port and the oscillating circuit are electrically coupled to each other through the signal transmission circuit. The earphone is connected to the earphone, the handheld device is connected to the handheld device, and the composite port is used to connect the charger or the computer device. When the charger is connected, the charger drives the oscillation circuit to generate a pulse signal, and the computer device is connected to the computer device. The system drives the oscillating circuit to generate a floating signal.

Wherein, the handheld device detects the power supply to the earphone when the earphone is connected to the earphone connection through the signal transmission circuit. When the handheld device obtains the pulse signal through the signal transmission circuit, the charger supplies power to the earphone and the handheld device, or when the floating signal is obtained, the computer device supplies power to the earphone and the handheld device, and the handheld device can exchange data through the signal transmission circuit.

The signal transmission circuit comprises a power transmission line, a data transmission line (made by two positive and negative voltage lines) and a device identification circuit. The handheld device and the earphone can obtain the power supply of the charger or the computer device through the power transmission line. The device identification circuit is connected to the earphone port, the handheld device port and the oscillating circuit, and the oscillating circuit is connected to a driving circuit. The data transmission line is connected to each port and then connected to the driving circuit, and the driving circuit is connected to the power transmission line. When the hybrid connector is connected to the charger, the data transmission line forms a path through the built-in line of the charger, and the drive circuit measures its path to provide the voltage of the power transmission line to the oscillating circuit, so that it provides the pulse signal to the device identification. The line is taken by the handheld device and determined to have been electrically coupled to the charger. On the other hand, when the composite connector is connected to the computer device, the data transmission lines are independent circuits, and the oscillating circuit does not obtain the operating voltage provided by the driving circuit, thereby providing a floating signal to the device identification circuit. The handheld device obtains and determines that the computer device has been electrically coupled. When the handheld device is electrically coupled to the computer device, the data exchange and transmission behavior can be performed through the data transmission line.

The device connection method of the composite connector for solving the above problems is applied to a handheld device to electrically couple at least one device by using a composite connector, and the technical means thereof comprises: detecting an electrical coupling device; In the case of the earphone, the handheld device determines that the signal is electrically coupled to the earphone through a signal transmission circuit of the composite connector; and when the earphone and the charger are connected, the earphone is powered by the charger to drive the composite connector. An oscillating circuit provides a pulse signal to the signal transmission circuit, and the handheld device obtains a pulse signal through the signal transmission circuit to determine that the sensor is electrically coupled to the earphone and the charger, and causes the charger to supply power to the earphone and the handheld device through the signal transmission circuit; And when the earphone and the computer device are connected, the computer device supplies the earphone to drive the oscillation circuit to provide a floating signal to the signal transmission circuit, and the handheld device obtains the floating signal through the signal transmission circuit to determine that the earphone is electrically coupled to the earphone and the computer. The device and the computer device supply power to the earphone and the handheld device through the signal transmission circuit, and Computer equipment and hand-held devices can exchange information behavior.

The invention is characterized in that, when the connector is connected to the computer device, the earphone and the handheld device at the same time, the handheld device can simultaneously obtain the working power supplied by the computer device when transmitting the audio data to perform charging or running related components. Moreover, through the connector, the handheld device can simultaneously transmit digital data or audio data with the computer device when obtaining power from the computer device. By means of the connector, when the handheld device and the earphone obtain external power supply, the audio data can be simultaneously transmitted to the earphone for playing, or the data exchange or transmission behavior is performed with the computer device, so as to achieve the effect of simultaneous multiplexing. Secondly, through the cooperation of the signal transmission circuit and the oscillating circuit, the handheld device can be easily identified as a charger or a computer device, and even if the handheld device is electrically coupled to the charger, the handheld device can be maintained. The ability of the headset to obtain external power and simultaneously transmit audio data to the headset for playback. Thirdly, the composite connector can operate a single function independently, that is, (1) the handheld device is electrically coupled to the earphone to supply and transmit audio data, and (2) the handheld device is electrically coupled to the charger or the computer device. Get the power supply, (3) When the handheld device is electrically coupled to the computer device, it exchanges data with it. This will increase the scope of application of this composite connector, while taking into account the needs of different environments.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described in detail below with reference to the drawings.

Referring to FIG. 2, a schematic block diagram of a composite connector according to an embodiment of the present invention is shown. Referring to FIG. 6, a circuit diagram of a composite connector according to an embodiment of the present invention is shown to facilitate understanding. The composite connector mainly includes a composite port 210, a headphone port 220, a handheld device port 230 and an oscillating circuit 240. The ports 248 and the oscillating circuit 240 are electrically coupled to each other through a signal transmission circuit 250.

The handheld device is connected to the device 230 for connection to the handheld device. The handheld device can be a data transmission device such as a Personal Digital Assistant (PDA), a Handheld Phone, or a Navigation Device. The earphone connection 埠220 is for connecting headphones, such as a Bluetooth headset or a wireless headset, or a wired headset. The composite port 210 can be plugged into a charger or a serial device, such as a Micro USB connector or an IEEE 1394 connector. Of course, the composite port 210 needs to be designed to meet the specifications of the Micro USB socket or the IEEE1394 socket. The earphone port 220 and the hand-held device port 230 can be designed in the same specifications. The operation mode of the composite port 210 is different according to the device connected to the composite port 210 to distinguish between the charger connection mode 211 and the computer device connection mode.

The signal transmission circuit 250 includes five circuit connections, a power transmission line (VBus) 251, a data transmission line (made by two positive and negative voltage lines, Data Bus, D+ and D-) 252, and a device identification circuit. (ID-Pin) 253 and a ground line (GND-Pin) 254. The power transmission line 251 and the data transmission line 252 are respectively connected to the respective connection ports, and the device identification line 253 is connected between the hand device connection port 230, the earphone connection port 220 and the oscillation circuit 240. The grounding line 254 is used to ground the device connected to the composite connector and its internal circuit.

FIG. 3 is a schematic diagram of the electrical coupling earphone of the handheld device according to the embodiment of the present invention. FIG. 4 is a schematic diagram of the electrical coupling of the handheld device, the earphone and the charger according to the embodiment of the present invention. FIG. The schematic diagram of the electrical coupling of the handheld device, the earphone and the computer device according to the embodiment of the present invention is shown. Referring to FIG. 6 at the same time, a circuit diagram of the composite connector according to the embodiment of the present invention is shown to facilitate understanding. The following describes the multiple working modes of the composite connector:

(1) As shown in FIG. 3, a handheld device 302 is connected to the handheld device port 230, and an earphone 301 is connected to the earphone port 220. A voltage regulating resistor is connected to the device identification circuit 253, so that the voltage change on the device identification line 253 is a constant voltage value, and the handheld device 302 detects that the device identification line 253 changes to the constant voltage value, that is, determines The earphone 301 is electrically coupled to the earphone 301, that is, the power is transmitted through the power transmission line 251 to the earphone 301, and the audio data is transmitted to the earphone 301 through the data transmission line 252 for playing.

(2) As shown in FIG. 4, the handheld device 302 is connected to the handheld device port 230, the earphone 301 is connected to the earphone port 220, and a charger 303 is connected to the composite port 210. As described above, the handheld device 302 supplies power to the earphone 301. When the charger 303 is connected to the composite port 210, the charger 303 causes the data transmission line 252 to communicate with itself to ground, causing the composite port 210 to activate the charger connection mode 211. The oscillating circuit 240 generates a pulse signal to the device identification line 253 when the data transmission line 252 is connected to the line, and the pulse signal is obtained by the handheld device 302 to determine that the charger 303 has been electrically coupled and replaced by the charger. 303 supplies power to the handheld device 302 and the earphone 301 through the power transmission line 251. The handheld device 302 can be charged thereby and can simultaneously transmit audio material to the earphone 301.

(3) As shown in FIG. 5, the handheld device 302 is connected to the handheld device port 230, the earphone 301 is connected to the earphone port 220, and a computer device 304 is connected to the composite port 210. When the computer device 304 is connected to the composite port 210, the data transmission line 252 is in an individual independent line, so that the composite port 210 activates the computer device connection mode 212, and the oscillation circuit 240 detects that the data transmission line 252 is not connected to the line. A floating signal is generated to the device identification line 253. The floating signal is obtained by the handheld device 302 to determine that the charger 303 has been electrically coupled, and is powered by the computer device 304 through the power transmission line 251 to the handheld device 302 and the earphone 301. The handheld device 302 can be charged by this, and can simultaneously transmit audio data to the earphone 301, or obtain digital data or audio data transmitted by the computer device 304 while the handheld device 302 obtains power from the computer device 304.

Please refer to FIG. 6 for a schematic diagram of the circuit of the composite connector according to the embodiment of the present invention. Please refer to FIG. 2 for reference, and the schematic block diagrams illustrated in FIG. 3 to FIG. 5 are used to facilitate understanding.

The composite connector includes a composite port 210, a headphone port 220, a handheld device port 230, and an oscillating circuit 240. Each of the ports and the oscillating circuit 240 is electrically coupled by the signal transmission circuit 250. The power transmission line 251 is disposed between the handheld device port 230, the earphone port 220, and the composite port 210. The device identification circuit 253 is connected to the earphone port 220, the hand-held device port 230 and the oscillating circuit 240. The oscillating circuit 240 is further connected to a driving circuit 260. The data transmission line 252 is connected to each port and then connected to the driving circuit 260. Circuit 260 is in turn coupled to power transmission line 251.

Referring to FIG. 3 simultaneously, when the composite connector is connected to the handheld device 302 and the earphone 301, the voltage regulating resistor built in the earphone 301 and the MOSFET-Q4 of the oscillation circuit 240 (Metal Oxide Semiconductor Field Effect Transistor) The equivalent output impedance (or drain impedance) of the transistor, hereinafter referred to as field effect transistor Q4), is connected in parallel to form an equivalent impedance. In this embodiment, the field effect transistor Q4 is infinitely formed due to its non-operation, and the voltage regulating resistor built in the earphone 301 (generally about 10KΩ) is used to make the equivalent impedance less than 10KΩ, resulting in the above equivalent impedance being less than 10KΩ. The voltage on the device identification line 253 is adjusted to a constant voltage value. When the handheld device 302 detects that the device identification line 253 is at the constant voltage value, it is determined that the earphone 301 is inserted into the earphone connection port 220 and is connected to the handheld device 埠 230. Electrically coupled. The handheld device 302 supplies power to the earphone 301 through the power transmission line 251, and transmits audio data to the earphone 301 through the data transmission line 252 for playback. Moreover, the field effect transistor Q4 can realize the on and off functions of the MOSFET along with the oscillation frequency of the oscillation circuit 240, and can effectively prevent the device from recognizing the transient pulse current on the line 253 from damaging the other front end circuits.

Referring to FIG. 4 simultaneously, when the composite connector is connected to the handheld device 302, the earphone 301 and the charger 303, the data transmission line 252 connected to the composite connector has its own line formed by the connection line inside the charger 303 to be connected. To the ground line 254, the field effect transistor Q1 of the driving circuit 260 is turned on to directly connect the oscillating circuit 240 to the power transmission line 251, so that the oscillating circuit 240 directly obtains the power supply of the power transmission line 251, which is generated by the frequency oscillator U1. a pulse signal, the pulse signal controls the field effect transistor Q2 to be turned on and off, so that the pulse signal is transmitted through the resistor R4, the field effect transistor Q2, the resistor R6, and the field effect transistor Q4 to be transmitted to the device identification line 253. The device 302 receives and determines that the charger 303 has been electrically coupled. The handheld device 302 stops supplying power to the earphone 301, and the charger 303 supplies power to the earphone 301 through the power transmission line 251. The handheld device 302 can transmit audio data to the earphone 301 through the data transmission line 252, and is also powered by the charger 303 through the power transmission line 251 for charging behavior.

Referring to FIG. 5 simultaneously, when the composite connector is connected to the handheld device 302, the earphone 301 and the computer device 304, the data transmission line 252 connected to the composite port 210 is an independent circuit, and the field effect transistor Q1 of the driving circuit 260 is When the circuit is disconnected, the oscillating circuit 240 cannot directly obtain the power supply of the power transmission line 251, and a floating signal (ie, no voltage and no grounding interruption without signal state) is generated by the frequency oscillator U1, so that the field effect transistor Q2 is open and uncontrolled. The state causes the device identification line 253 to also form the above floating signal. This floating signal is received by the handheld device 302 and determined to have been electrically coupled to the computer device 304. The handheld device 302 stops supplying power to the earphone 301, and the computer device 304 supplies power to the earphone 301 through the power transmission line 251. However, the handheld device 302 can transmit audio data to the earphone 301 or the computer device 304 through the data transmission line 252. Through capital The material transmission line 252 transmits digital data or audio data to the handheld device 302, and is simultaneously powered by the computer device 304 through the power transmission line 251 for charging behavior.

Please refer to FIG. 7 for a flow chart of a device connection method of a composite connector according to an embodiment of the present invention. Please refer to FIG. 2 to FIG. 6 to facilitate understanding. The device connection method in this embodiment is applied to the handheld device 302 to electrically couple at least one device by using a composite connector. The connection method includes: detecting an electrically coupled device (step S10). As previously described, the handheld device 302 identifies the change in signal on the line 253 based on the device of the signal transmission circuit 250 to determine what the currently connected device is. When the earphone 301 is connected, the voltage regulating resistor connection device of the earphone 301 recognizes the voltage above it when the line 253 is recognized, and the handheld device 302 determines whether the earphone 301 is connected to the earphone port 220 according to the voltage change.

When the earphone 301 and the charger 303 are connected, the charger 303 is connected to the data transmission line 252. When the driving circuit 260 detects that the data transmission line 252 is connected, the field effect transistor Q1 of the driving circuit 260 is turned on to make the power transmission line 251 directly The power is supplied to the oscillating circuit 240 to provide a pulse signal to the device identification circuit 253 for acquiring the pulse signal by the handheld device 302. The handheld device 302 determines whether the charger 303 is electrically coupled by the pulse signal.

When the earphone 301 is connected to the serially connected computer device 304, the computer device 304 communicates with the data transmission line 252, and the oscillation circuit 240 does not obtain the operating voltage provided by the driving circuit 260, so that it provides a floating signal to The device identification line 253 is used to obtain a hovering signal from the handheld device 302. The handheld device 302 determines whether or not to electrically couple the computer device 304 by suspending the signal.

When an earphone 301 is connected, the handheld device 302 supplies power to the earphone 301. The handheld device 302 detects that the voltage on the device identification line 253 of the signal transmission circuit 250 is adjusted to a constant voltage value, and the handheld device 302 determines that the earphone 301 has been electrically coupled (step S11). The hand-held device 302 transmits power to the earphone 301 through the power transmission line 251 of the signal transmission circuit 250 (step S12). Further, an audio data is transmitted from the handheld device 302 through the data transmission line 252 of the signal transmission circuit 250 to the earphone 301 (step S13). In addition, the steps S12 and S13 can be performed simultaneously in addition to the above sequence.

When the earphone 301 and a charger 303 are connected, power is supplied from the charger 303. The composite port 210 enters the charger connection mode 211. The drive circuit 260 detects that the data transmission line 252 is connected to supply power to the oscillating circuit 240, and causes the oscillating circuit 240 to provide a pulse signal to the device identification line 253. The handheld device 302 detects that the voltage on the device identification line 253 of the signal transmission circuit 250 is adjusted to a constant voltage value, and the pulse signal transmitted from the oscillation circuit 240 is obtained from the device identification line 253. The earphone 301 and the charger 303 are electrically coupled (step S21). The handheld device 302 interrupts its own power supply to the earphone 301, and the charger 303 transmits power to the earphone 301 and the hand-held device 302 through the power transmission line 251 of the signal transmission circuit 250 (step S22). Further, an audio data is transmitted from the handheld device 302 through the data transmission line 252 of the signal transmission circuit 250 to the earphone 301 (step S23). Wherein, in addition to the above sequence, steps S22 and S23 can be performed simultaneously.

When the headset 301 is connected to a computer device 304, power is supplied by the computer device 304. The composite port 210 enters the computer device connection mode 212. The drive circuit 260 detects that the data transmission line 252 is an individual independent line and does not supply power to the oscillation circuit 240, so that the oscillation circuit 240 provides a floating signal to the device identification line 253. The handheld device 302 detects that the voltage on the device identification line 253 of the signal transmission circuit 250 is adjusted to a constant voltage value, and obtains the floating signal transmitted from the oscillation circuit 240 from the device identification line 253. The handheld device 302 determines that the The earphone 301 is electrically coupled to the computer device 304 (step S31). The handheld device 302 interrupts its own power supply to the earphone 301, and the computer device 304 transmits power to the earphone 301 and the hand-held device 302 through the power transmission line 251 of the signal transmission circuit 250 (step S32). Further, the audio data is transmitted from the handheld device 302 to the earphone 301 through the data transmission line 252 of the signal transmission circuit 250 (step S33), or the data exchange and transmission behavior is performed by the handheld device through the data transmission line 252 and the computer device 304. (Step S34). The steps S32 and S33, or the steps S32 and S34, in addition to the above sequence, can be performed simultaneously, and the steps S33 and S34 can only be performed one at a time.

In the above, it is merely described that the present invention is an embodiment or an embodiment of the technical means for solving the problem, and is not intended to limit the scope of implementation of the present invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention.

Prior art:

111. . . Charging connection埠

112. . . Headphone connection埠

113. . . Mobile phone connection埠

120. . . Oscillation circuit

130. . . Signal transmission circuit

131. . . Power transmission line

132. . . Data transmission line

133. . . Device identification line

this invention:

210. . . Composite connection

211. . . Charger connection mode

212. . . Computer device connection mode

220. . . Headphone connection埠

230. . . Handheld device connection埠

240. . . Oscillation circuit

250. . . Signal transmission circuit

251. . . Power transmission line

252. . . Data transmission line

253. . . Device identification line

254. . . Ground line

260. . . Drive circuit

301. . . headset

302. . . Handheld device

303. . . charger

304. . . Computer equipment

Step S10 to step S13

Step S21 to step S23

Step S31 to step S34

1 is a circuit diagram of a prior art Y-type connector;

2 is a block diagram showing the principle of a composite connector according to an embodiment of the present invention;

3 is a schematic diagram of an electrical coupling earphone of a handheld device according to an embodiment of the invention;

4 is a schematic diagram showing electrical coupling of a handheld device, a headset, and a charger according to an embodiment of the present invention;

FIG. 5 is a schematic diagram showing the electrical coupling of the handheld device, the earphone and the computer device according to the embodiment of the present invention; FIG.

6 is a schematic circuit diagram of a composite connector according to an embodiment of the present invention;

FIG. 7 is a flow chart showing a method for connecting devices of a composite connector according to an embodiment of the present invention.

210. . . Composite connection

220. . . Headphone connection埠

230. . . Handheld device connection埠

240. . . Oscillation circuit

250. . . Signal transmission circuit

251. . . Power transmission line

252. . . Data transmission line

253. . . Device identification line

254. . . Ground line

260. . . Drive circuit

Claims (15)

A composite connector, in addition to connecting a headset and a handheld device, further connected to a charger or a computer device having a serial connection, the composite connector comprising: an oscillating circuit; a driving circuit connecting the An oscillating circuit; a composite port connected to the charger or the computer device, wherein when the charger is connected to the composite port, the charger drives the oscillating circuit to generate a pulse signal, and when the computer device is connected to the composite When the port is connected, the computer device drives the oscillating circuit to provide a levitation signal; a headphone port 埠 connects the earphone; a handheld device connects 埠 to connect the handheld device; and a signal transmission circuit connects the composite port 埠The earphone port is connected to the handheld device, and the signal transmission circuit further comprises a data transmission line connected to the driving circuit. The handheld device detects the earphone connection to the earphone connection through the signal transmission circuit. Supplying power to the earphone, and when the pulse signal is obtained through the signal transmission circuit, the charger is replaced by the charger Receiving the earphone and the handheld device, and when the computer device is connected to the composite port, the data transmission line interrupts power of the driving circuit, so that the oscillating circuit does not obtain power supply from the driving circuit to provide the floating signal to the a handheld device, when the handheld device obtains the floating signal through the signal transmission circuit, the computer device supplies power to the earphone and the handheld device. And the handheld device can exchange data through the signal transmission circuit. The composite connector of claim 1, wherein the signal transmission circuit further comprises a power transmission line, the power of the handheld device is powered by the power transmission line to the earphone, or by the charger or the The power of the computer device is supplied to the earphone through the power transmission line. The composite connector of claim 2, wherein the handheld device obtains power from the charger or the computer device through the power transmission line. The composite connector of claim 1, wherein the signal transmission circuit further comprises a device identification circuit, the earphone comprises a voltage regulating resistor, the earphone is connected to the earphone connection port to connect the voltage regulating resistor The device identifies a line to change the voltage of the device identification line, and the handheld device recognizes the voltage change of the line according to the device to determine whether the earphone is connected to the earphone connection port. The composite connector of claim 4, wherein the oscillating circuit is connected to the device identification circuit, and when the charger is connected to the composite port, the data transmission line is connected, and the driving circuit measures When the data transmission line is connected, power is supplied to the oscillating circuit to provide the pulse signal to the device identification circuit to obtain the pulse signal by the handheld device. The composite connector of claim 4, wherein the oscillating circuit is connected to the device identification line, and when the computer device is connected to the composite port, the data transmission line is an independent line, and the oscillating power The path provides the hang signal to the device identification line to obtain the hang signal from the handheld device. The composite connector of claim 1, wherein the signal transmission circuit comprises a data transmission line connected between the composite connection port and the handheld device connection port, and the composite connection port is connected to the computer device The data transmission line is for the computer device to transmit a digital data to the handheld device. A device for connecting a composite connector is applied to a handheld device to electrically couple at least one device through the composite connector. The device connection method includes the following steps: detecting that the device is electrically coupled, the handheld device The device utilizes a signal change of a signal transmission circuit of the composite connector to identify that the device is electrically coupled; when a headset is connected, the handheld device passes the signal transmission circuit of the composite connector to determine that the electrical coupling is electrically coupled. Receiving the earphone and supplying power to the earphone; when connecting the earphone and a charger, the charger drives an oscillation circuit of the composite connector to provide a pulse signal to the signal transmission circuit, when the handheld device transmits the signal through the signal When the circuit receives the pulse signal, it is determined that the earphone and the charger are electrically coupled, so that the charger supplies power to the earphone and the handheld device through the signal transmission circuit; and when the earphone is connected with a serial connection In the case of a computer device, one of the data transmission lines of the composite connector forms an independent line to interrupt the connection of one of the data transmission lines. Power of the road, so that the connection The oscillating circuit of the driving circuit provides the floating signal to the signal transmitting circuit without receiving power, and when the handheld device obtains the floating signal through the signal transmitting circuit, determining that the earphone and the computer device are electrically coupled, so that the The computer device supplies power to the earphone and the handheld device through the signal transmission circuit. The device connection method of the composite connector according to claim 8, wherein the step of supplying power to the earphone by the handheld device further comprises the step of: transmitting an audio data to the earphone by the handheld device. The device connection method of the composite connector according to claim 8, wherein the step of supplying power by the charger further comprises the step of: transmitting an audio data to the earphone by the handheld device. The device connection method of the composite connector according to claim 8, wherein the step of supplying power by the computer device further comprises the step of: transmitting an audio material to the earphone by the handheld device. The device connection method of the composite connector according to claim 8, wherein the step of supplying power by the computer device further comprises the step of: transmitting, by the computer device, a digital data to the handheld device. The device connection method of the composite connector according to claim 8, wherein a device identification circuit is connected between the handheld device connection port and the earphone connection port to detect electrical coupling. Connect In the step of the at least one device, when the earphone is connected, a voltage regulating resistor of the earphone is connected to the device to change the voltage when the circuit is recognized, and the handheld device determines whether the earphone is connected to the earphone connection according to the change of the voltage. port. The device connection method of the composite connector according to claim 13 , wherein the oscillating circuit is connected to the device identification circuit in the step of detecting the at least one device electrically coupled, when the earphone is connected And the charger, the charger is connected to the data transmission line, and the driving circuit detects that the data transmission line is connected to supply power to the oscillating circuit, so that the pulse signal is provided to the device identification line for the handheld device The pulse signal is obtained. The device connection method of the composite connector according to claim 13 , wherein the oscillating circuit is connected to the device identification circuit, and in the step of detecting whether the at least one device is connected, when the earphone is connected In the case of a computer device, the oscillating circuit provides the levitation signal to the device identification circuit for the handheld device to acquire the levitation signal.