TWI547031B - Electrical contact detection circuit and portable electrical system using the same - Google Patents

Description

Electronic contact detection circuit and portable electronic system thereof

The invention relates to an electronic contact detecting circuit and a portable electronic system thereof, and particularly to an electronic contact detecting method capable of generating a prompt signal according to a state or an action of a contact so that an electronic system can activate a corresponding function according to the present invention. Portable electronic systems for circuits and their applications.

At present, a general integrated mobile product, if it contains two or more sub-devices, must detect the connection state between the sub-devices, and many of them are completed by means of a magnetic switch. The magnetic control switch uses magnetic force to achieve control of the mechanical switch. However, the control of the magnetron switch does not represent a good electrical connection between the two sub-devices. Moreover, the magnetic switch has a larger size and a higher cost than the electronic switch. Therefore, in order to make the appearance of the portable electronic product more compact and cheaper, it is necessary to replace the function of the magnetic control switch with other more suitable components.

In view of the above problems, the present invention mainly provides an electronic electronic contact detecting circuit capable of generating a prompt signal according to a state or action of a contact, enabling an electronic system to activate a corresponding function, and a portable electronic system thereof.

In order to achieve the above object, the present invention provides an electronic contact detecting circuit, A first device is applied to detect the electrical connection state of the first device and a second device. The second device has an electrical end point. The electronic contact detecting circuit comprises: a contact detecting end point; the contact state indicating the end point, when the contact detecting end point is electrically coupled to the electrical end point, the contact state indicating the end point outputs the first voltage to indicate the contact state, Otherwise, the contact state indicates that the terminal outputs a second voltage to indicate a non-contact state; and the disconnected indication end point, when the contact detection end point and the electrical end point change from a contact state to a non-contact state, the indication end is disconnected The point emits a first pulse width signal having a first pulse width.

In an embodiment of the invention, the electrical end point has an output voltage, and the electronic contact detecting circuit further includes a first resistor, a first transistor, a second resistor, a first capacitor, a third resistor, and a second Crystal. The first resistor is coupled between the contact detecting end and the ground. The control end of the first transistor is coupled to the contact detecting end, and the channel of the first transistor is coupled between the first end and the ground. The second resistor is coupled between the first terminal and the supply voltage. The first capacitor is coupled between the first end point and the second end point. The third resistor is coupled between the second end and the ground. The control end of the second transistor is coupled to the second end point, and the channel of the second transistor is coupled between the disconnection indicating end point and the ground end. The contact state indication end point is coupled to the first end point.

In an embodiment of the invention, the first transistor and the second transistor are N-type field effect transistors or NPN type bipolar junction transistors.

In an embodiment of the invention, the electronic contact detecting circuit further includes a diode. The positive end of the diode is coupled to the contact state indicating end point, and the negative end of the diode is coupled to the second end point.

In an embodiment of the invention, the electrical end point has an output voltage, and the electronic contact detecting circuit further includes a connection indicating end point, and the contact detecting end point and the electrical end point change from a non-contact state to a contact state. State, the connection indicates that the endpoint emits a second pulse having a second pulse width Wide signal.

In an embodiment of the invention, the electronic contact detecting circuit further includes a second capacitor coupled between the connection indicating end point and the contact detecting end point.

In an embodiment of the invention, the electronic contact detecting circuit is in the form of an integrated circuit.

In an embodiment of the invention, when the first device is in the off state, and the electronic contact detecting circuit sends the first pulse width signal, the first device enters the power-on state from the power-off state.

In an embodiment of the invention, the first device is a Bluetooth headset, and the second device is a mobile power source.

In an embodiment of the invention, when the Bluetooth headset is powered on and receives an incoming call, and the electronic contact detection circuit sends a first pulse width signal, the Bluetooth headset answers the incoming call.

In an embodiment of the invention, when the Bluetooth headset is in the on state and the incoming call is turned on, and the contact state of the electronic contact detecting circuit indicates that the endpoint outputs the first voltage, the Bluetooth headset hangs up the incoming call.

In an embodiment of the invention, when the Bluetooth headset is powered on, and the electronic contact detection circuit emits a second pulse width signal, the Bluetooth headset enters a shutdown state, and the mobile power source charges the Bluetooth headset.

Moreover, in order to achieve the above object, the present invention provides a portable electronic system having the same circuit as the first device and the second device to which the aforementioned electronic contact detecting circuit is applied.

The utility model has the advantages that the electronic contact detecting circuit disclosed in the invention can replace the traditional magnetic control switch, so that the electronic system can still generate the lifting according to the state or action of the contact. The signal number is used to activate the corresponding function. Compared with magnetic switches, electronic circuits have the advantages of lower cost and smaller size, which makes the appearance of the product more compact and more durable, and can be extended to more integrated human action products.

The features, implementations, and utilities of the present invention are described in detail below with reference to the drawings.

1, 50‧‧‧ portable electronic system

10‧‧‧ first device

20‧‧‧second device

21‧‧‧Electrical endpoints

22‧‧‧Battery

23‧‧‧Boost conversion circuit

24‧‧‧Charging output

110‧‧‧Electronic contact detection circuit

111‧‧‧Contact Detection Endpoint

112‧‧‧Contact status indication endpoint

113‧‧‧Disconnect indication endpoint

114‧‧‧Connection indication endpoint

115‧‧‧Charging input

120‧‧‧Microcontroller

130‧‧‧ Grounding terminal

140‧‧‧First endpoint

150‧‧‧ supply voltage

160‧‧‧second endpoint

1101‧‧‧First resistance

1102‧‧‧First transistor

1103‧‧‧second resistance

1104‧‧‧First Capacitor

1105‧‧‧ Third resistor

1106‧‧‧Second transistor

1107‧‧‧Anti-static resistor

1108‧‧‧Dipole

1109‧‧‧second capacitor

410, 420, 430, 510, 520‧‧‧ waveforms

411, 511‧‧‧ output voltage

421‧‧‧First pulse width

422‧‧‧First pulse width signal

431‧‧‧First voltage

432‧‧‧second voltage

521‧‧‧second pulse width

522‧‧‧Second pulse width signal

51‧‧‧Bluetooth headset

52‧‧‧Mobile power supply

T1, t2, t3, t4, t5‧‧‧ time

Figure 1 is a block diagram of a portable electronic system in a non-contact state in accordance with an embodiment of the present invention.

2 is a block diagram of a portable electronic system in a contact state in accordance with an embodiment of the present invention.

Figure 3 is a circuit diagram of a portable electronic system in accordance with an embodiment of the present invention.

Figure 4: Corresponding waveform diagram of the electronic contact detecting circuit when the portable electronic system disclosed in the present invention enters the non-contact state from the contact state.

FIG. 5 is a waveform diagram of the electronic contact detecting circuit when the portable electronic system disclosed in the present invention enters the contact state from a non-contact state.

Figure 6 is a schematic diagram of the portable electronic system disclosed in the present invention applied to a Bluetooth headset and a mobile power source.

In the context of the specification and subsequent patent applications, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, the first device can be directly electrically connected to the second device or indirectly electrically connected to the second device through other devices or connection means.

1 is a block diagram of a portable electronic system 1 in a "non-contact state" according to an embodiment of the present invention, and FIG. 2 is a portable electronic system in a "contact state" according to an embodiment of the present invention. 1 block diagram. The portable electronic system 1 includes a first device 10 and a second device 20. The second device 20 has an electrical end point 21. The first device 10 includes an electronic contact detecting circuit 110. The electronic contact detecting circuit 110 is configured to detect the electrical connection state of the first device 10 and the second device 20. The electronic contact detecting circuit 110 includes a contact detecting end point 111, a contact state indicating end point 112, and a disconnecting indicating end point 113. When the contact detection terminal 111 is electrically coupled to the electrical terminal 21, the contact state indicates that the terminal 112 outputs a first voltage to indicate that the portable electronic system 1 is in a "contact state", that is, as shown in FIG. status. Otherwise, the contact state indicates that the terminal 112 outputs a second voltage to indicate that the portable electronic system 1 is in the "non-contact state", that is, the state as shown in FIG. When the contact detecting end point 111 and the electrical end point 21 are changed from the contact state of FIG. 2 to the non-contact state of FIG. 1, the disconnecting indicating end point 113 emits the first pulse width signal having the first pulse width. .

FIG. 3 is a circuit diagram of a portable electronic system 1 according to an embodiment of the present invention. The electrical terminal 21 can have an output voltage. For example, the second device 20 is a mobile power source and has a battery 22, the output voltage being the voltage provided by the battery 22, such as 3.7 volts. The electronic contact detecting circuit 110 may further include a first resistor 1101, a first transistor 1102, a second resistor 1103, a first capacitor 1104, a third resistor 1105, and a second transistor 1106. The first resistor 1101 is coupled between the contact detecting end point 111 and the ground end 130. The control terminal of the first transistor 1102 is coupled to the contact detecting terminal 111. The channel of the first transistor 1102 is coupled between the first terminal 140 and the ground terminal 130. The second resistor 1103 is coupled between the first terminal 140 and a supply voltage 150. The first capacitor 1104 is coupled between the first end point 140 and the second end point 160. Third electricity The resistor 1105 is coupled between the second terminal 160 and the ground terminal 130. The control terminal of the second transistor 1106 is coupled to the second terminal 160, and the channel of the second transistor 1106 is coupled between the disconnection indicating terminal 113 and the ground terminal 130. The contact state indication end point 112 is coupled to the first end point 140. In addition, the control end of the first transistor 1102 may be coupled to the contact detecting end point 111 via the antistatic resistor 1107 to prevent the first transistor 1102 from directly being subjected to electrostatic shock and causing damage. However, the antistatic resistor 1107 is not an essential component, and it must be noted that the addition of the antistatic resistor 1107 cannot affect the operation of the electronic contact detecting circuit 110, such as a voltage dividing circuit formed by the antistatic resistor 1107 and the first resistor 1101. The voltage division effect of the contact detecting terminal 111 cannot be formed too much, and the control of the first transistor 1102 by the contact detecting terminal 111 is affected. Therefore, it can be designed that the resistance of the antistatic resistor 1107 is negligible with respect to the resistance of the first resistor 1101, for example, 1 kilohm (ohm) and 4.7 million ohms, respectively.

Further, the first transistor 1102 and the second transistor 1106 may be an N-type field-effect transistor or an NPN-type bipolar junction transistor. It is worth noting that the set of field effect transistors includes metal-oxide-semiconductor field-effect transistors (MOSFETs), junction field-effect transistors (JFETs), and insulation. An insulated-gate bipolar transistor (IGBT) or a semiconductor element having a structure and function similar to those described above. The control terminal of the field effect transistor refers to its gate terminal, and the channel of the field effect transistor refers to the channel between its source terminal and the drain terminal. The control terminal of a bipolar junction transistor (BJT) refers to a base terminal, and the channel of a bipolar junction transistor refers to a collector terminal and an emitter terminal. ) between the channels.

In addition, the electronic contact detecting circuit 110 may further include a diode 1108. The positive end of the diode 1108 is coupled to the contact state indicating end point 112, and the negative end of the diode 1108 is coupled to the second end point 140. For example, when the rear stage circuit of the electronic contact detecting circuit 110 is the microcontroller 120 as shown in FIG. 1 and FIG. 2, the input pin of the microcontroller 120 usually has a pull up (pull up). The function, for example, the input pin is coupled to the input interface voltage via a pull-up resistor. Therefore, the diode 1108 not only functions as a voltage level conversion, but also converts the value of the supply voltage 150 of the electronic contact detecting circuit 110 to the value of the input interface voltage, and also functions as an isolation internal circuit. Protects against damage caused by direct impact from static electricity. It should be noted that the diode 1108 is not an essential component of the electronic contact detecting circuit 110, and the operation details of the diode 1108 in the electronic contact detecting circuit 110 are known to those of ordinary skill in the art. I will not repeat them here.

It is to be noted that the microprocessor 120 of Figures 1 and 2 is for illustrative purposes of the present invention, as the functions and features of the microprocessor are known to those of ordinary skill in the art. An example can be conveniently explained. The microprocessor 120 is not intended to limit the scope of the present invention, and any circuit that can implement the related functions disclosed in the present invention is the patent protection scope of the present invention.

FIG. 4 is a related waveform diagram of the electronic contact detecting circuit 110 when the portable electronic system 1 of the present invention enters the non-contact state from the contact state. The waveforms 410, 420, and 430 correspond to the voltage waveforms of the contact detecting end point 111, the disconnecting indicating end point 113, and the contact state indicating end point 112, respectively. The waveform shown in Fig. 4 will be described below in conjunction with the embodiment shown in Fig. 3. Before the time t1, the first device 10 and the second device 20 are in a contact state, so the contact detecting terminal 111 receives the output voltage 411 of the electrical terminal 21, such as the battery 22 A 3.7 volt output, as shown by waveform 410. The control terminal of the first transistor 1102 receives a partial voltage of the output voltage 411, so that the channel of the first transistor 1102 is turned on, and the contact state indicates that the terminal 112 is coupled to the ground via the channel of the diode 1108 and the transistor 1102. 130, thus a lower potential, that is, the aforementioned first voltage 431, as shown by waveform 430. At this time, the control terminal of the second transistor 1106 is coupled to the ground terminal 130 via the third resistor 1105, so that the channel of the second transistor 1106 is turned off, and the opening indicating terminal 113 is due to the pull-up effect of the subsequent circuit. The voltage is at a higher potential as shown by waveform 420.

Further, at time t1, the first device 10 is disconnected from the second device 20, and thus begins to be in a non-contact state. At this time, the contact detecting terminal 111 cannot receive the output voltage 411 of the electrical terminal 21, so the voltage of the contact detecting terminal 111 starts to decrease, as shown by the waveform 410. Until time t2, the voltage of the contact detecting end point 111 cannot turn on the channel of the first transistor 1102, and the first end point 140 starts to rise to the voltage value of the supply voltage 150 via the second resistor 1103, so the contact status indication The voltage at endpoint 112 changes from first voltage 431 to a second, higher voltage 432 at time t2, as shown by waveform 430. The second terminal 160 is coupled to the first terminal 140 via the first capacitor 1104. Therefore, at time t2, the voltage of the second terminal 160 will rise with the voltage of the first terminal 140, and the second power will be used. The channel of the crystal 1106 is turned on, and the turn-off indicating terminal 113 is coupled to the ground terminal 130 via the channel of the second transistor 1106, so that it is a lower potential, as shown by the waveform 420. Next, through the resistor-capacitor circuit composed of the second resistor 1103, the first capacitor 1104, and the third resistor 1105, the voltage of the second terminal 160 approaches the voltage of the ground terminal 130 (generally defined as 0 volts). The speed at which it approaches is determined by the time constant of the resistor-capacitor circuit. Until time t3, the voltage of the second terminal 160 has failed to turn on the channel of the second transistor 1106, so the channel of the second transistor 1106 is turned off, and the off-point indicates the end point. 113, due to the pull-up of the subsequent stage circuit, its voltage returns to a higher potential, and forms a first pulse width signal 422 having a first pulse width 421, as shown by waveform 420.

In conjunction with the above description, when the first device 10 is disconnected from the second device 20 such that the portable electronic system 1 begins to be in a non-contact state, the contact state indicates that the endpoint 112 changes its steady state voltage, such as shown by waveform 430. The first voltage 431 is changed to a second voltage 432, and the open indicating end 113 emits a first pulse width signal 422 having a first pulse width 421 (eg, 30 milliseconds), as shown by waveform 420. The first pulse width 421 can be designed and adjusted by the resistance values of the components in the resistor-capacitor circuit and the capacitance values to meet the requirements of various applications.

For example, when the first device 10 is in the off state and disconnected from the second device 20, the electronic contact detecting circuit 110 sends a first pulse width signal, for example, the electronic contact detecting circuit 110 can be broken. The open indication end 113 sends a first pulse width signal, and the electronic contact detection circuit 110 can utilize the microcontroller 120 as shown in FIG. 1 and FIG. 2 (but not limited thereto) to detect After the first pulse width signal, the first device 10 is switched from the power off state to the power on state.

In addition, in the portable electronic system 1 disclosed in FIG. 1 and FIG. 2, the electronic contact detecting circuit 110 may further include a connection indicating end point 114, when the contact detecting end point 111 and the electrical end point When the non-contact state is changed to the contact state between 21, the connection indication terminal 114 emits a second pulse width signal having a second pulse width.

For example, in the embodiment disclosed in FIG. 3, the second capacitor 1109 may be further included between the connection indicating end point 111 and the contact detecting end point 114. The connection indicating that the endpoint 111 can be connected to the microprocessor 120 of the subsequent stage for utilization, and the input of the microcontroller 120 The pin can usually provide a pull down function, for example, the input pin is coupled to the ground via a pull-down resistor.

FIG. 5 is a related waveform diagram of the electronic contact detecting circuit 110 when the portable electronic system 1 of the present invention enters a contact state from a non-contact state. The waveforms 510 and 520 respectively correspond to the voltage waveforms of the contact detecting end point 111 and the contact detecting end point 114. The waveform shown in Fig. 5 will be described below with reference to the embodiment shown in Fig. 3. Before the time t4, the first device 10 and the second device 20 are in a non-contact state, so the contact detecting terminal 111 is coupled to the ground terminal 130 via the first resistor, so that it is a lower potential, such as the waveform 510. Show. The contact detection terminal 114 is also at a lower potential due to the pull-down resistor in the subsequent stage of the electronic contact detection circuit 110, as shown by the waveform 520.

Further, at time t4, the first device 10 is in contact with the second device 20, and thus begins to be in a contact state. At this time, the contact detecting terminal 111 receives the output voltage 511 of the electrical terminal 21, so that the voltage of the contact detecting terminal 111 rises to the output voltage 511 as shown by the waveform 510. The voltage of the contact detecting terminal 114 also rises to a higher voltage due to the coupling of the second capacitor 1109, as shown by the waveform 520. . After time t4, the voltage of the contact detecting terminal 114 is pulled back to the low potential by the action of the pull-down resistor of the subsequent stage, and at time t5, the potential of the contact detecting terminal 114 starts to be low enough, so that The input circuit of the subsequent stage (e.g., microcontroller 120) produces a transitional response, thereby generating a second pulse width signal 522 having a second pulse width 521 on the contact detection terminal 114, wherein the second pulse width 521 is The capacitance value of the second capacitor 1109 and the resistance value of the pull-down resistor are determined by those skilled in the art, and therefore will not be further described herein. It should be noted that the second capacitor 1109 is not an essential component of the electronic contact detecting circuit 110.

In summary, the first device 10 is in contact with the second device 20, so that the portable electronic system 1 is in a contact state, and the contact detecting terminal 114 emits a second pulse having a second pulse width 521. Wide signal 522, as shown by waveform 520. The second pulse width 521 can be designed and adjusted by the capacitance value of the second capacitor 1109 and the resistance value of the pull-down resistor to meet the requirements of various applications.

It should be noted that the electronic contact detecting circuit 110 disclosed in the present invention is suitable for integration by means of an integrated circuit, and may be a single chip or one of functional blocks of other large integrated circuits. Therefore, the size and cost of the hardware can be effectively reduced.

6 is a schematic diagram of the portable electronic system 50 disclosed in the present invention applied to the Bluetooth headset 51 and the mobile power source 52, wherein the Bluetooth headset 51 corresponds to the first device 10 in FIGS. 1 to 3, and the mobile power source 52 corresponds to the second device 20. The portable electronic system 50 adaptively utilizes the signals generated by the electronic contact detecting circuit 110 to enhance the usability of the Bluetooth headset 51. The components in the first to third figures and their component symbols will be described below.

For example, the Bluetooth headset 51 is placed on the mobile power source 52 for charging and is in a powered-on state. When the Bluetooth headset 51 receives an incoming call, the user removes the Bluetooth headset 51 from the mobile power source, that is, when the contact detecting terminal 111 and the electrical terminal 21 change from the contact state to the non-contact state. The electronic contact detecting circuit 110 sends a first pulse width signal, and the microprocessor 120 controls the Bluetooth headset 51 to answer an incoming call according to the first pulse width signal.

For example, when the Bluetooth headset 51 is in a power-on state and an incoming call has been connected for a call, if the user puts the Bluetooth headset 51 back to the mobile power source 52, the contact detection terminal 111 and the electrical endpoint 21 are Electronic contact detection from non-contact state to contact state The contact state of the circuit 110 indicates that the terminal 112 outputs the first voltage, and the microprocessor 120 accordingly controls the Bluetooth headset 51 to hang up the incoming call.

For example, when the Bluetooth headset 51 is in a power-on state, if the user puts the Bluetooth headset 51 back to the mobile power source 52, the contact detection terminal 111 and the electrical terminal 21 are changed from the non-contact state to the contact state. The electronic contact detecting circuit 110 sends the second pulse width signal, and the microprocessor 120 controls the Bluetooth device 51 to enter the shutdown state according to the second pulse width signal, and the battery 22 of the mobile power source 52 is boosted and converted. The circuit 23 generates a charging voltage source (e.g., 5 volts) and charges the Bluetooth headset 51 through an electrical connection between the charging output terminal 24 and the charging input terminal 115 as shown in FIG.

Although the embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and those skilled in the art, regardless of the spirit and scope of the present invention, the shapes, structures, and features described in the scope of the present application. And the number of modifications may be made, and the scope of patent protection of the present invention shall be determined by the scope of the patent application attached to the specification.

1‧‧‧Portable electronic system

10‧‧‧ first device

20‧‧‧second device

21‧‧‧Electrical endpoints

110‧‧‧Electronic contact detection circuit

111‧‧‧Contact Detection Endpoint

112‧‧‧Contact status indication endpoint

113‧‧‧Disconnect indication endpoint

114‧‧‧Connection indication endpoint

120‧‧‧Microcontroller

Claims (24)

An electronic contact detecting circuit is applied to a first device for detecting an electrical connection state of the first device and a second device, wherein the second device includes an electrical end point, and the electronic contact detecting The measuring circuit includes: a contact detecting end point; a contact state indicating end point, when the contact detecting end point is electrically coupled to the electrical end point, the contact state indicating that the end point outputs a first voltage to indicate a Contact state, otherwise the contact state indicates that the terminal outputs a second voltage to indicate a non-contact state; and a disconnect indication terminal, when the contact detection terminal and the electrical end point are in contact with each other Changing to the non-contact state, the disconnection indicating end emits a first pulse width signal having a first pulse width. The electronic contact detecting circuit of claim 1, wherein the electrical end point has an output voltage, and the electronic contact detecting circuit further comprises: a first resistor coupled to the contact detecting a first transistor, the control end of the first transistor is coupled to the contact detecting end, the channel of the first transistor is coupled to a first end point and the ground a second resistor coupled between the first terminal and a supply voltage; a first capacitor coupled between the first terminal and a second terminal; a third resistor Connected between the second end point and the ground end; a second transistor, the control end of the second transistor is coupled to the second end, and the channel of the second transistor is coupled between the disconnect indication end and the ground; wherein the contact state The indication endpoint is coupled to the first endpoint. The electronic contact detecting circuit of claim 2, wherein the first transistor and the second transistor are in the form of an N-type field effect transistor or an NPN type bipolar junction transistor. The electronic contact detecting circuit of claim 2, further comprising a diode, wherein a positive end of the diode is coupled to the contact state indicating end point, and a negative end of the diode is coupled to the first end Two endpoints. The electronic contact detecting circuit of claim 1, wherein the electrical end point has an output voltage, and the electronic contact detecting circuit further comprises a connection indicating end point, when the contact detecting end point The contact state is changed from the non-contact state to the contact state, and the connection indicates that the terminal emits a second pulse width signal having a second pulse width. The electronic contact detecting circuit of claim 5, further comprising a second capacitor coupled between the connection indicating end point and the contact detecting end point. The electronic contact detecting circuit according to any one of claims 1 to 6, wherein the electronic contact detecting circuit is in the form of an integrated circuit. The electronic contact detecting circuit according to any one of the preceding claims, wherein the first device is in a shutdown state, and the electronic contact detecting circuit sends the first pulse width signal, The first device enters a power-on state from the power-off state. The electronic contact detecting circuit according to any one of claims 1 to 6, wherein the first device is a Bluetooth headset, and the second device is a mobile power source. The electronic contact detecting circuit of claim 9, wherein the Bluetooth headset is in a power-on state and receives an incoming call, and the electronic contact detecting circuit sends the first pulse width signal, the blue The bud headset answers the call. The electronic contact detecting circuit of claim 9, wherein the Bluetooth headset is in an on state and an incoming call has been turned on, and the contact state of the electronic contact detecting circuit indicates that the endpoint outputs the The first voltage, the Bluetooth headset hangs up the call. The electronic contact detecting circuit of claim 5, wherein the first device is a Bluetooth headset, and the second device is a mobile power source, and the Bluetooth headset is in a power on state. And the electronic contact detecting circuit sends the second pulse width signal, the Bluetooth headset enters a shutdown state, and the mobile power source charges the Bluetooth headset. A portable electronic system includes: a first device comprising an electronic contact detecting circuit; and a second device having an electrical end point; wherein the electronic contact detecting circuit is configured to detect the The electrical connection state of the first device and the second device, the electronic contact detecting circuit includes: a contact detecting end point; a contact state indicating an end point, when the contact detecting end point is electrically coupled to the electric Sexual endpoint, the contact state indicating that the endpoint outputs a first electrical Pressing to indicate a contact state, otherwise the contact state indicating that the terminal outputs a second voltage to indicate a non-contact state; and a disconnecting indicating end point, when the contact detecting end point and the electrical end point The contact state changes to the non-contact state, and the disconnection indicates that the terminal emits a first pulse width signal having a first pulse width. The portable electronic system of claim 13, wherein the electrical end point has an output voltage, and the electronic contact detecting circuit further comprises: a first resistor coupled to the contact detecting end a first transistor, the control end of the first transistor is coupled to the contact detecting end, and the channel of the first transistor is coupled to a first end point and a ground end a second resistor coupled between the first terminal and a supply voltage; a first capacitor coupled between the first terminal and a second terminal; a third resistor, The second transistor is coupled to the second terminal, and the second transistor is coupled to the second terminal, and the channel of the second transistor is coupled to the second transistor. The indication end point and the ground end; wherein the contact status indication end point is coupled to the first end point. The portable electronic system of claim 14, wherein the first transistor and the second transistor are in the form of an N-type field effect transistor or an NPN type bipolar junction transistor. The portable electronic system of claim 14, further comprising a diode, the positive end of the diode is coupled to the contact state indicating end, and the negative end of the diode is coupled to the second End point. The portable electronic system of claim 13, wherein the electrical end point has an output voltage, and the electronic contact detecting circuit further comprises a connection indicating end point, when the contact detecting end point The non-contact state is changed to the contact state between the electrical terminals, and the connection indicates that the terminal emits a second pulse width signal having a second pulse width. The portable electronic system of claim 17, further comprising a second capacitor coupled between the connection indication endpoint and the contact detection endpoint. The portable electronic system of any one of claims 13 to 18, wherein the electronic contact detecting circuit is in the form of an integrated circuit. The portable electronic system of any one of claims 13 to 18, wherein the first device is in a shutdown state, and the electronic contact detecting circuit sends the first pulse width signal, the first A device enters a power-on state from the power-off state. The portable electronic system of any one of claims 13 to 18, wherein the first device is a Bluetooth headset and the second device is a mobile power source. The portable electronic system of claim 21, wherein when the Bluetooth headset is in a power-on state and receives an incoming call, and the electronic contact detecting circuit sends the first pulse width signal, the Bluetooth The headset answers the call. The portable electronic system of claim 21, wherein when the Bluetooth headset is in a power on state and an incoming call is connected, the electronic contact detection The contact state of the measurement circuit indicates that the endpoint outputs the first voltage, and the Bluetooth headset hangs up the incoming call. The portable electronic system of claim 17 or 18, wherein the first device is a Bluetooth headset, and the second device is a mobile power source, when the Bluetooth headset is in a power on state, And the electronic contact detecting circuit sends the second pulse width signal, the Bluetooth headset enters a shutdown state, and the mobile power source charges the Bluetooth headset.