CN209419249U

CN209419249U - The wireless headset and charging unit and the circuit of the two, charging system and circuit of recognizable connection relationship

Info

Publication number: CN209419249U
Application number: CN201822104556.1U
Authority: CN
Inventors: 翁建城; 黄海涛
Original assignee: Zhuhai Jieli Technology Co Ltd
Current assignee: Zhuhai Jieli Technology Co Ltd
Priority date: 2018-12-14
Filing date: 2018-12-14
Publication date: 2019-09-20
Anticipated expiration: 2028-12-14

Abstract

The utility model provides wireless headset, charging unit and system, and wireless headset includes the second detection control module, current source, second switch, resistance, charging input end；The charging input end with the charging output end of charging unit for connecting；The current source is via the charging input end and resistance eutral grounding；The second detection control module is used to make the current source export the second electric current by controlling the second switch when switch sign is conducting, so that the current source is stopped working by controlling the second switch when switch sign is to disconnect；The second detection control module is also used to determine according to the level and the switch sign that detect the charging input end electrical connection of the wireless headset Yu the charging unit.Wireless headset can level based on charging input end and switch sign determine the electrical connection of itself and the wireless headset.

Description

The wireless headset and charging unit and the circuit of the two of recognizable connection relationship, charging System and circuit

Technical field

The utility model relates to the wireless headsets and charging unit and two of the field of charging more particularly to recognizable connection relationship Circuit, charging system and the circuit of person.

Background technique

In recent years, various portable electronic product development are swift and violent, and TWS (True Wireless Stereo, very Wireless headset) it is exactly nowadays there is one of quite representative portable electronic product.For not needing through conducting wire and outside The wireless headset of equipment connection, the lithium battery power supply for needing it internal, and charging box is to provide charging exclusively for wireless headset Equipment.

In wireless headset and charging box fit applications, initial charge box is in standby, when wireless headset is put into charging Box, charging box detect that earphone is inserted into, and just opening boosting output is that wireless headset charges.When charging box detects that earphone is taken out, Enter standby mode, again to reduce oneself power consumption.The detection technique of current numerous charging boxes relies primarily on active and passive Two ways: 1. detect the switch cover movement of charging box by charging box switch detection circuit to control to the earphone in charging box It charges, that is, passes through after detecting that charging box cover is opened, the boosting for waking up charging box charges to wireless headset, works as detection To after charging box cover closure, turn off charging box boosting, to reduce oneself power consumption.2. by increasing mechanical switch or bullet in charging box Piece is put into wireless headset and takes out charging box there is different hardware to connect, switchs to electric signal transmission and give charging box chip Make to wake up and close boost module.For active mode, since switch detection circuit all exists always, no matter charging box is to be in beat Still closed state is opened, the charging box energy content of battery is all consumed.For passive mode, due to being mechanical switch or elastic slice, a side Face increases cost, on the other hand takes out wireless headset being repeatedly put into for a long time, unavoidably all asks in the presence of consume and reliability Topic.Especially for both the above mode, certain matching requirement will be made to the apparent size of charging box and wireless headset.

In addition, as the direction of portable electronic product towards further raising user experience and cruising ability is sent out Exhibition, the automatic company's of returning mobile phone after wireless headset is taken out from charging box, if wireless headset is playing before being put into charging box Song also further plays song by wireless telecommunications (for example, bluetooth communication), presses on & off switch manually without user.Wirelessly As long as earphone is either charging or is being full of still in charging box, especially charging box under-voltage protection or charging box battery Low-voltage variation in the case where causing charging box output to be zero, requires that wireless headset not can be carried out go back to company and enter low-power consumption mould Formula.In other words, making charging box without output, wireless headset needs recognise that in charging box.Technology is to charge at present Box increases Hall sensor, is divided generation level change by Hall sensor magnetic field and is put into and takes out to identify wireless headset The movement of charging box.But increase Hall sensor, it is meant that increase cost.

Utility model content

For overcome the deficiencies in the prior art, charging unit is avoided to use above-mentioned mechanical switch, elastic slice and Hall sensor, And realize detection of the wireless headset to itself and charging unit electrical connection, the utility model is provided a kind of recognizable and filled The circuit (such as chip) of the wireless headset of electric installation electrical connection, including the second detection control module, current source, second open Pass, resistance, charging input end；The charging input end is used for the charging output end in contact with charging unit and is electrically connected；The electricity Stream source is via the charging input end and resistance eutral grounding；The second detection control module is used for logical when switch sign is conducting It crosses and controls the second switch current source is made to export the second electric current to flow through the resistance, it is logical when switch sign is to disconnect It crosses and controls the second switch current source is made to stop working；The second detection control module is also used to according to detection The level of charging input end and the switch sign determine the electrical connection of the wireless headset Yu the charging unit.

In some embodiments, the second detection control module is also used to according to the level for detecting the charging input end And the switch sign determines the electrical connection of the wireless headset Yu the charging unit specifically: second detection Control module is also used to basis and detects that the voltage of the charging input end is high level, and the switch sign is to disconnect When, the second detection control module determines that the wireless headset is electrically connected with charging unit formation.

In some embodiments, the second detection control module is also used to according to the level for detecting the charging input end And the switch sign determines the electrical connection of the wireless headset Yu the charging unit specifically: second detection Control module is also used to basis and detects the switch when voltage of the charging input end jumps to low level from high level Flag bit is set as being connected, and controls the second switch according to the switching flag bits and be connected；If the charging input end is High level, then what the second detection control module determined the wireless headset and the charging unit is electrically connected disconnection.

In some embodiments, the second detection control module is also used to according to the level for detecting the charging input end And the switch sign determines the electrical connection of the wireless headset Yu the charging unit specifically: second detection Control module is also used to basis and detects the switch when voltage of the charging input end jumps to low level from high level Flag bit is set as being connected, and controls the second switch according to the switching flag bits and be connected；If the charging input end is Low level, then the second detection control module determines that the wireless headset is electrically connected with the charging unit.

In some embodiments, the second detection control module is also used to according to the level for detecting the charging input end And the switch sign determines the electrical connection of the wireless headset Yu the charging unit specifically: in second inspection Survey the second detection control after control module detects that the level of the charging input end jumps to low level from high level Module with setpoint frequency for being executed: switch sign being revised as conducting to control second switch conducting；The second detection control Molding block detects the level of the charging input end again, if the level of the charging input end is high level, determines the nothing Line earphone is electrically connected disconnection with the charging unit；If the level of the charging input end is low level, the nothing is determined Line earphone is electrically connected with the charging unit.

In some embodiments, the second detection control module includes the second control module and the second comparison module；Institute The first input end for stating the second comparison module connects the charging input end, the second input terminal connects the second reference voltage, output End connects second control module；Second control module is used for, when switch sign is conducting by controlling described the Two switches make the current source export the second electric current, make the electricity by controlling the second switch when switch sign is to disconnect Stream source stops working, and the level of the charging input end according to the level detection that second comparison module exports；Wherein, The product of second electric current and the resistance is greater than second reference voltage.

In some embodiments, the circuit of the wireless headset further includes anti-reverse conduction module, charging module, described anti- Reverse-conducting module is used to prevent the voltage of the charging module from flowing backward to the charging input end.

For overcome the deficiencies in the prior art, charging unit is avoided to use above-mentioned mechanical switch, elastic slice and Hall sensor, And realize detection of the wireless headset to itself and charging unit electrical connection, the utility model provides a kind of charging system Circuit, circuit and the recognizable circuit with the wireless headset of the charging unit electrical connection including charging unit；It is described The circuit of wireless headset includes the second detection control module, current source, second switch, resistance, charging input end；The charging is defeated Enter charging output end in contact of the end for the circuit of charging unit to be electrically connected；The current source via the charging input end and Resistance eutral grounding；The circuit of the charging unit includes charging output end, first switch, and the charging output end passes through first switch Ground connection；The first switch is used to be controlled system conducting when the line under-voltage, is disconnected when the power supply is not under-voltage by control； The second detection control module is used to keep the current source defeated by controlling the second switch when switch sign is conducting The second electric current stops the current source by controlling the second switch when switch sign is to disconnect to flow through the resistance out Only work；The second detection control module is also used to according to the level and the switch sign for detecting the charging input end Determine the electrical connection of the wireless headset Yu the charging unit.

In some embodiments, the first switch is enhanced P-channel MOS switch pipe, when line under-voltage when institute State the grid that the first detection control module exports no-voltage to the enhanced P-channel MOS switch pipe.

In some embodiments, the second detection control module is also used to according to the level for detecting the charging input end And the switch sign determines the electrical connection of the wireless headset Yu the charging unit specifically: second detection Control module is also used to basis and detects that the voltage of the charging input end is high level, and the switch sign is to disconnect When, the second detection control module determines that the wireless headset is electrically connected with charging unit formation；Alternatively, described second Detection control module is also used to according to detect when the voltage of the charging input end jumps to low level from high level will be described Switching flag bits are set as being connected, and control the second switch according to the switching flag bits and be connected；If the charging input End is high level, then what the second detection control module determined the wireless headset and the charging unit is electrically connected disconnection, If the charging input end is low level, the second detection control module determines the wireless headset and the charging unit Electrical connection；Alternatively, it is low to detect that the level of the charging input end is jumped to from high level in the second detection control module After level, the second detection control module with setpoint frequency for being executed: switch sign being revised as conducting to control the Two switch conductions；The second detection control module detects the level of the charging input end again, if the charging input end Level is high level, then determine the wireless headset and the charging unit is electrically connected disconnection；If the charging input end Level is low level, then determines that the wireless headset is electrically connected with the charging unit.

For overcome the deficiencies in the prior art, charging unit is avoided to use above-mentioned mechanical switch, elastic slice and Hall sensor, And realize detection of the wireless headset to itself and charging unit electrical connection, the utility model is provided a kind of recognizable and filled The circuit of the wireless headset of electric installation electrical connection, including the second control module, the second comparison module, current source, second open Pass, resistance, charging input end, anti-reverse conduction module；The charging input end is used for the charging with charging unit and exports termination Electric shock connection；The current source is via the charging input end and resistance eutral grounding；The first input end of second comparison module Connect the charging input end, the second input terminal connects the second reference voltage, output end connects second control module；It is described Second control module is used for, and makes second electricity of current source output by controlling the second switch when switch sign is conducting Stream makes the current source stop working when switch sign is to disconnect to flow through the resistance by controlling the second switch； The level of charging input end described in the level detection that second control module is also used to be exported according to second comparison module, And determine that the wireless headset and the charging fill according to the level of the charging input end of detection and the switch sign The electrical connection set.

For overcome the deficiencies in the prior art, charging unit is avoided to use above-mentioned mechanical switch, elastic slice and Hall sensor, And realize detection of the wireless headset to itself and charging unit electrical connection, the utility model additionally provide it is a kind of can recognize with The wireless headset of charging unit electrical connection, the circuit including any wireless headset.

For overcome the deficiencies in the prior art, charging unit is avoided to use above-mentioned mechanical switch, elastic slice and Hall sensor, And realize detection of the wireless headset to itself and charging unit electrical connection, the utility model additionally provides a kind of Charging System, the circuit including any charging system.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model provides a kind of recognizable and wireless The circuit (such as chip) of the charging unit of earphone electrical connection, comprising: DC-DC module, is filled at the first detection control module Electricity output end；The output end of the DC-DC module is connect with charging output end, and the charging output end is used for and wireless headset Charging input end contact electrical connection；The first detection control module is used to be equal to zero when the electric current of DC-DC module output When by mode flags set constant current mode, the DC-DC module is used to work in constant current mode according to the mode flags；Institute The first detection control module is stated for detecting that the voltage of the charging output end jumps to low level from high level, and described When mode flags are constant current mode, determine that the charging unit is electrically connected with wireless headset formation, by the mode flags Position is set as voltage mode, and controls the DC-DC module according to the voltage mode and export first voltage.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model provides a kind of electricity of charging system Road, including can recognize the circuit with the circuit of the charging unit of wireless headset electrical connection and wireless headset, the charging dress The circuit set includes: DC-DC module, the first detection control module, charging output end；The output end of the DC-DC module with fill The connection of electricity output end；The first detection control module is used for mode when the electric current that the DC-DC module exports is equal to zero Traffic sign placement is constant current mode, and the DC-DC module is used to work in constant current mode according to the mode flags to export first Electric current；The circuit of the wireless headset includes: resistance, charging input end；The charging input end is via the resistance eutral grounding；Institute Charging output end is stated to be used to contact electrical connection with the charging input end；The first detection control module is described for detecting The voltage of output end of charging jumps to low level from high level, and when the mode flags are constant current mode, fills described in judgement Electric installation is electrically connected with wireless headset formation, sets voltage mode for the mode flags position, and according to the voltage DC-DC module described in scheme control exports first voltage.

In some embodiments, the first detection control module includes the first control module and the first comparison module；Institute State the first comparison module first input end connection charging output end, the second input terminal connect the first reference voltage, output end with The connection of first control module；The product of first electric current, the resistance and partial pressure coefficient is less than first reference voltage；Institute State level of first control module for the charging input end according to the level detection that first comparison module exports.

In some embodiments, the circuit of the wireless headset further include include second detection control module；Described second Detecting control module includes the second control module and the second comparison module；The first input end of second comparison module connects institute State charging input end, the second input terminal connects the second reference voltage, output end connects second control module；First electricity Stream and the product of the resistance are greater than second reference voltage, and the product of second electric current and the resistance is greater than described the Two reference voltages；Second control module is used for input of charging according to the level detection that second comparison module exports The level at end is to determine the electrical connection of the wireless headset and charging unit.

In some embodiments, the circuit of the charging unit further includes first switch, and the charging output end passes through the One switch ground connection；The first switch is used to be controlled system conducting when the line under-voltage, is controlled when the power supply is not under-voltage System disconnects；The circuit of the wireless headset further include: the second detection control module, current source, second switch；The current source warp By the charging input end and resistance eutral grounding；The second detection control module is used to pass through control when switch sign is conducting The second switch makes the current source export the second electric current, is made when switch sign is to disconnect by controlling the second switch The current source stops working；It is described second detection control module be also used to according to detect the charging input end level and The switch sign determines the electrical connection of the wireless headset Yu the charging unit.

In some embodiments, the second detection control module includes the second control module and the second comparison module；Institute The first input end for stating the second comparison module connects the charging input end, the second input terminal connects the second reference voltage, output End connects second control module；The product of first electric current and the resistance is greater than second reference voltage, described The product of second electric current and the resistance is greater than second reference voltage；The second detection control module is also used to according to inspection It measures the charging input end level and the switch sign determines being electrically connected for the wireless headset and the charging unit Relationship specifically: second control module is used for input of charging according to the level detection that second comparison module exports The level at end and the switch sign are to determine the electrical connection of the wireless headset and charging unit.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model provides a kind of electricity of charging system Road, including can recognize the circuit with the circuit of the charging unit of wireless headset electrical connection and wireless headset, the charging dress The circuit set includes: DC-DC module, the first comparison module, the first control module, first switch, charging output end, power supply；Institute The circuit for stating wireless headset includes the second comparison module, the second control module, current source, second switch, resistance, charging input End；The charging output end is used to contact electrical connection with the charging input end；The input terminal of the DC-DC module and the electricity Source connection, output end are connect with charging output end, and charging output end is grounded by first switch；The of first comparison module One input terminal connection charging output end, the second input terminal connects the first reference voltage, output end is connect with the first control module；Institute First switch is stated for being controlled system conducting when the line under-voltage；The current source connects via the charging input end and resistance Ground, the first input end of second comparison module connects the charging input end, the second input terminal connects the second reference voltage, Output end connects second control module；Second control module is used for, when switch sign controls institute to pass through when conducting Stating second switch makes the current source export the second electric current, makes institute by controlling the second switch when switch sign is disconnects Current source is stated to stop working；First control module is used to determine institute when the electric current that the DC-DC module exports is equal to zero Be electrically connected disconnection of the charging unit with the wireless headset is stated, and sets constant current mode, the DC-DC module for mode flags For working in constant current mode according to the mode flags to export the first electric current；First control module is for passing through detection The voltage of charging output end described in the signal determining of the first comparison module output jumps to low level, and institute from high level When to state mode flags be constant current mode, first control module determines that the charging unit is electrically connected with the wireless headset, Voltage mode is set by the mode flags position, and first electricity of DC-DC module output is controlled according to the voltage mode Pressure；Second control module is also used to according to detecting that the charging input end level and the switch sign determine The electrical connection of wireless headset and the charging unit；Wherein, first electric current, the resistance and the product for dividing coefficient Less than first reference voltage, the product of first electric current and the resistance is greater than second reference voltage, and described the The product of two electric currents and the resistance is greater than second reference voltage.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model provides a kind of recognizable and wireless The circuit (such as chip) of the charging unit of earphone electrical connection, comprising: DC-DC module, the first comparison module, the first control Molding block, first switch, charging output end, power supply；The input terminal of the DC-DC module connect with the power supply, output end with The output end that charges connects, and charging output end passes through first switch and is grounded；The first input end connection of first comparison module is filled Electricity output end, the second input terminal connect the first reference voltage, output end is connect with the first control module；The first switch is used for System conducting is controlled when the line under-voltage；The charging output end is electrically connected for contacting with the charging input end of wireless headset It connects；First control module is used to determine the charging unit and institute when the electric current that the DC-DC module exports is equal to zero The electrical connection for stating wireless headset disconnects, and sets constant current mode for mode flags, and the DC-DC module is used for according to the mould Formula mark works in constant current mode；First control module is used to sentence by the signal for detecting the first comparison module output The voltage of the fixed charging output end jumps to low level from high level, and when the mode flags are constant current mode, described First control module determines that the charging unit is electrically connected with wireless headset formation, and sets the mode flags position to Voltage mode, and the DC-DC module is controlled according to the voltage mode and exports first voltage.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model additionally provides a kind of recognizable and nothing The charging unit of line earphone electrical connection, including any charging unit that can recognize with wireless headset electrical connection Circuit.

For overcome the deficiencies in the prior art, avoid charging unit using above-mentioned mechanical switch, elastic slice and Hall sensor To realize the detection of charging unit pair with the electrical connection of wireless headset, the utility model additionally provides a kind of charging system, Circuit including any charging system.

The utility model has the advantages that

For wireless headset and system comprising it, through the above scheme, it can increase to avoid charging unit mechanical The elements such as switch, elastic slice or Hall sensor are so that wireless headset can detecte its electrical connection with charging unit.As The shell of further effect, charging unit and wireless headset is not needed upon above-mentioned mechanical switch, elastic slice or hall sensing Device is specifically designed, and so as to reduce cost, improves reliability.

For charging unit and system comprising it, by using above-mentioned charging unit, wireless headset, charging system Or method, the elements such as mechanical switch, elastic slice or Hall sensor can be increased to avoid charging unit to detect charging unit and nothing The electrical connection of line earphone.As further effect, the shell of charging unit and wireless headset is not needed upon above-mentioned Mechanical switch, elastic slice or Hall sensor are specifically designed, and so as to reduce cost, improve reliability.

Detailed description of the invention

Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:

Fig. 1 is a kind of schematic diagram of embodiment of charging system of the utility model charging box and wireless headset composition；

Fig. 2 is one kind of the charging input end voltage oscillogram comparison of the charging output end and wireless headset of Fig. 1 charging box The schematic diagram of embodiment；

Fig. 3 is the another of the charging input end voltage oscillogram comparison of the charging output end and wireless headset of Fig. 1 charging box The schematic diagram of kind embodiment.

Specific embodiment

Now in conjunction with attached drawing, elaborate to the preferred embodiment of the utility model.

Fig. 1 is a kind of schematic diagram of embodiment of charging system of charging box of the present invention and wireless headset composition, the Charging It unites and can recognize the electrical connection of charging box and wireless headset.Charging box 10 includes the detection control mould of DC-DC module 11, first Block, first switch S1, power supply 12, charging output end POWEROUT, the first ground terminal GND1, wherein DC-DC module 11 includes electric current Detection module 111, in one embodiment, the first detection control module includes the first comparison module C1, the first control module 13. Wireless headset 20 includes that charging module 21, second detects control module, current source 24, second switch S2, resistance R, counnter attack guide Logical module 23, charging input end POWERIN, rechargeable battery VBAT, the second ground terminal GND2, in one embodiment, the second inspection Surveying control module includes the second comparison module C2, the second control module 22.

In charging box 10, the input terminal of DC-DC module 11 connect with power supply 12, output end and charging output end POWEROUT connection, charging output end POWEROUT are grounded by first switch S1.The non-inverting input terminal of first comparison module C1 Connection charging output end POWEROUT, reverse input end connect the first reference voltage VR1, output end and the first control module 13 Input terminal connection；First ground terminal GND1 is connected to ground.Current detecting unit 111 is used to detect the electric current of the output of DC-DC module 11, It can be appreciated that current detecting unit 111 also can be set except DC-DC module 11.First control module 13 manages DC-DC mould The mode flags (mode flags can store in a register) of block 11, there are two types of values for mode flags tool: constant current mode and electricity Die pressing type (such as boost mode), the first control module 13 can be set the values of the mode flags constant current mode and voltage mode it Between switch, the initial value of the mode flags can be set to constant current mode.First control module 13 is according to the values of the mode flags The operating mode for controlling DC-DC module 11, when the value of mode flags is voltage mode, the first control module 13 is according to mode mark Will controls first voltage of the output of DC-DC module 11 for charging to wireless headset 20；When the value of mode flags is constant current When mode, the first control module 13 controls DC-DC module 11 according to mode flags and exports constant current (the first electric current).At one In embodiment, first voltage is obtained from the work of DC-DC module 11 is boosted the voltage of power supply 12 in boost mode Voltage (charging voltage), such as 5V.First control module 13 can be logic circuit, and the first comparison module C1 can be comparator.

In wireless headset 20, charging input end POWERIN via anti-reverse conduction module 23 and charging module 21 with can Rechargeable battery VBAT connection, the non-inverting input terminal of the second comparison module C2 connect with charging input end POWERIN, anti-phase input End is connect with the second reference voltage VR2, output end is connect with the input terminal of the second control module 22, and the second comparison module C2 is used In the size of the voltage for comparing charging input end POWERIN and the second reference voltage VR2；Second control module, 22 management switch mark Will (switch sign can store in a register), the value of switch sign include: conducting and disconnection, and the second control module 22 is used for The conducting and disconnection that second switch S2 is controlled according to the value of the switch sign, when the value of switch sign is conducting, the second control Module 22 controls second switch S2 conducting according to the value (conducting) of switch sign, when the value of switch sign is to disconnect, the second control Molding block 22 controls second switch S2 according to the value (disconnection) of switch sign and disconnects；Rechargeable battery VBAT via second switch S2, Current source 24 is connect with charging input end POWERIN, and charging input end POWERIN is grounded via resistance R；Second ground terminal GND2 with Ground connection.Rechargeable battery VBAT powers via second switch S2 to current source 24, the current source 24 when second switch S2 is disconnected It stops working, that is, the electric current exported is zero, and when second switch S2 conducting, current source 24 exports the second electric current to flow through resistance R. Second control module 22 can be logic circuit, and the second comparison module C2 can be comparator.Anti-reverse conduction module 23 is used for Prevent the voltage of charging module 21 and/or battery VBAT (via charging module 21) from flowing backward into charging input end POWERIN, with There is mistake in the level for preventing the second detection control module from detecting, and then causes to determine that mistake occurs in obtained electrical connection. In one embodiment, anti-reverse conduction module 23 can be diode, the anode and charging input end POWERIN of diode Connection, cathode are connect with charging module 21；Anti-reverse conduction module 23 can also be unidirectional conducting switch etc..It is appreciated that anti- Reverse-conducting module 23 can also be integrated in charging module 21.

Initial stage (such as after charging box 10 powers on), charging earphone 20 not yet contacts formation electrical connection with charging box 10 (such as be put into charging box 10 and form electrical connection), in 10 side of charging box, the first control module 13 is by the mould of DC-DC module 11 Formula traffic sign placement is constant current mode, and the first control module 13 controls the work of DC-DC module 11 in constant current mould according to the mode flags Formula, and control first switch S1 are disconnected；In 20 side of wireless headset, second switch S2 is disconnected.Specifically, as shown in Fig. 2, In charging box 10, since first switch S1 is disconnected at this time, DC-DC module 11 is unloaded, the electricity of 11 reality output of DC-DC module Stream is zero, and the voltage of charging output end POWEROUT is pulled to second voltage U2, and (in one embodiment, second voltage U2 is to fill The supply voltage of electric box 10), i.e., the voltage of the non-inverting input terminal of the first comparison module C1 is second voltage U2, inverting input terminal Voltage is the first reference voltage VR1, since second voltage U2 is defeated greater than the first reference voltage VR1, the first comparison module C1 High level gives the first control module 13 out.Based on this, when the first control module 13 detects the high electricity of the first comparison module C1 output Flat and mode flags are constant current mode, then determine that charging box 10 is not electrically connected with wireless headset 20 at this time and (detect alternatively, working as The electric current of DC-DC module output is 0, determines that charging box 10 is not electrically connected with wireless headset 20 at this time), therefore maintain mode flags Value be constant current mode, and maintain first switch S1 disconnect.As shown in Fig. 2, in wireless headset 20, due to second switch S2 It disconnects, the electric current that current source 24 exports is zero, and the voltage of charging input end POWERIN is zero, i.e., the second comparison module C2's is same The voltage of phase input terminal is zero, and the voltage of the inverting input terminal of the second comparison module C2 is the second reference voltage VR2, therefore the Two comparison module C2 export low level to the second control module 22.Based on this, when the second control module 22 detects that second compares Module C2 exports low level, and switch sign is then to determine that wireless headset 20 is not electrically connected with the formation of charging box 10 when disconnecting, To maintain switch sign constant.

When the needs of wireless headset 20 are electrically connected with charging box 10 to be charged (for example, wireless headset 20 is put into charging Box 10 is to charge), charging output end POWEROUT is electrically connected with charging input end POWERIN formation, charging box 10 Electric energy is conveyed by charging output end POWEROUT and charging input end POWERIN to wireless headset 20.First ground terminal GND1 with Second ground terminal GND2 connection, however the first ground terminal GND1 can also be not connected to the second ground terminal GND2.As shown in Fig. 2, due to this When mode flags be constant current mode, once charging output end POWEROUT and charging input end POWERIN formed be in electrical contact, DC- DC module 11 exports the first constant electric current, and the first electric current is via charging output end POWEROUT, charging input end POWERIN Voltage with resistance to ground terminal, the output end POWEROUT and charging input end POWERIN that charges at this time is I1*R2 (such as Fig. 2 institute Show, at the t1 moment, the voltage for the output end POWEROUT that charges drops to U3), i.e. the non-inverting input terminal of the first comparison module C1 Voltage is I1*R2.Since I1*R2 exports low level to first less than the first reference voltage VR1, the first comparison module C1 Control module 13.Based on this, when the first control module 13 detects that the level of the first comparison module C1 output is jumped from high level To low level (namely it is decided that the voltage of charging output end POWEROUT jumps to low level from high level), and mode flags Value is constant current mode, then determines that wireless headset 20 is electrically connected with charging box 10, and mode flags are revised as voltage mode, DC-DC module 11 is converted to output first voltage from constant current mode according to mode flags (voltage mode) by the first control module 13 Voltage mode (such as boost mode).Hereafter, the voltage of charging output end POWEROUT is maintained at first voltage (such as Fig. 2 institute Show, be essentially pulled up to U1 in the charge voltage of output end POWEROUT of t2 moment), since first voltage is greater than the first reference voltage VR1, therefore the first comparison module C1 exports high level.Based on this, when the first control module 13 detects the first comparison module C1 High level is exported, and the value of mode flags is voltage mode, then determines that charging box 10 is still electrically connected with wireless headset 20, and Charging box 10 charges to wireless headset 20.For wireless headset 20, when wireless headset 20 is inserted into the wink of charging box 10 Between, the voltage of charging input end POWERIN be I1*R2 (i.e. the voltage of the non-inverting input terminal of the second comparison module C2 is I1*R2, As shown in Fig. 2, the voltage in t1 moment charging input end POWERIN is pulled to U3), since I1*R2 is greater than second with reference to electricity VR2 is pressed, therefore the second comparison module C2 exports high level to the second control module 22.Based on this, when the second control module 22 is examined The second comparison module C2 output level is measured from low level to jump to high level (i.e. the voltage of charging input end POWERIN is from low Level jump is to high level), and the value of switch sign is then to determine that wireless headset 20 and charging box 10 form electricity when disconnecting Connection, and control the unlatching of charging module 21；Hereafter, charging input end POWERIN be maintained at first voltage (as shown in Fig. 2, T2 moment voltage is further pulled to U1), since first voltage is greater than the second reference voltage VR2, the second comparison module C2 continues to output high level.The first voltage that charging box 10 exports passes through charging input end POWERIN, anti-reverse conduction module 23 and charging module 21 to rechargeable battery VBAT charge.Based on this, when the second control module 22 detects the second comparison module C2 exports high level (i.e. the voltage of charging input end POWERIN is high level), and the value of switch sign is when disconnecting, then to sentence Determine wireless headset 20 and form with charging box 10 to be electrically connected, and continues to control charging module 21 and open.

It is full of as the electricity of the rechargeable battery VBAT of wireless headset 20 is close, flows into the charging electricity of charging module 21 Stream is gradually reduced, thus the charging current that DC-DC module 11 exports is gradually reduced.On the one hand, the current detecting list of charging box 10 Member 111 detects that (in one embodiment, which removes charging current slightly larger than first voltage less than setting electric current threshold value The current value obtained with resistance) after, to the output of the first control module 13 to induction signal, the first control module 13 will according to the signal The value of mode flags is revised as constant current mode from voltage mode, and the first control module 13 is controlled according to mode flags (constant current mode) DC-DC module 11 works in constant current mode, that is, exports the first electric current；Charging box 10 no longer supplies charging module 21 at this time This state of electricity, charging box 10 can be referred to as standby mode.On the other hand, wireless headset 20 can also be grasped as follows Make: when the current detecting unit 111 of wireless headset 20 detects that the charging current for flowing into charging module 21 is less than a certain threshold value, Second control module 22 controls charging module 21 and closes.When DC-DC module 11 exports the first electric current, charge output end The voltage of POWEROUT and charging input end POWERIN are I1*R2.For charging box 10, the first comparison module C1's is same The voltage I1*R2 (as shown in Fig. 2, dropping to U3 in t3 moment voltage) of phase input terminal is less than the voltage (i.e. the of inverting input terminal One reference voltage VR1), therefore the first comparison module C1 exports low level.Based on this, when the first control module 13 detects first Comparison module C1 output level from high level jump to low level (i.e. charging output end POWEROUT level from high level jump Change to low level), and the value of mode flags is constant current mode, and the first control module 13 then determines that wireless headset 20 is in and fills Electric box 10 is electrically connected.And for wireless headset 20, the voltage I1*R2 of the non-inverting input terminal of the second comparison module C2 is (as schemed Shown in 2, U3 is dropped in t3 moment voltage) it is greater than the voltage (i.e. the second reference voltage VR2) of inverting input terminal, therefore the second ratio High level is exported compared with module C2.Based on this, when the second control module 22 detect the second comparison module C2 export high level, and And the value of switch sign is to disconnect, the second control module 22 then determines that wireless headset 20 is still electrically connected with the formation of charging box 10.

When being electrically connected between wireless headset 20 and charging box 10 be disconnected (such as user by wireless headset 20 from charging Taken out in box 10), including following several situations: 1, with wireless headset 20 when charging box 10 to wireless headset 20 charge Electrical connection is disconnected (value of mode flags is voltage mode at this time)；2, when wireless headset 20 fills with electricity with charging box 10 Electrical connection is disconnected (value of mode flags is constant current mode at this time).In the 1st kind of situation, for charging box 10, due to The voltage (first voltage) of the non-inverting input terminal of the first comparison module C1 is greater than voltage (the first reference electricity of inverting input terminal at this time Press VR1), therefore the first comparison module C1 exports high level；In addition the electricity that the current detecting unit 111 of charging box 10 detects Stream is 0.Based on this, when the first control module 13 detects that the first comparison module C1 exports high level, and current detecting unit The electric current of 111 detections is 0, and the first control module 13 then determines that being electrically connected between charging box 10 and wireless headset 20 is broken at this time It opens, and mode flags is revised as constant current mode from voltage mode.First control module 13 is according to mode flags (constant current mould Formula) control DC-DC module 11 be revised as constant current mode from voltage mode.In the 2nd kind of situation, for charging box 10, by In voltage (the second voltage U2, as shown in Fig. 2, on t4 moment voltage of the non-inverting input terminal of the first comparison module C1 at this time It is pulled to U2) it is greater than the voltage (the first reference voltage VR1) of inverting input terminal, therefore the first comparison module C1 exports high level.Base In this, when the first control module 13 detect the first comparison module C1 export high level, and the value of mode flags be (constant current Mode), the first control module 13 then determines to be electrically connected disconnection (alternatively, when inspection between charging box 10 and wireless headset 20 at this time The electric current for measuring DC-DC module output is 0, determines that charging box 10 is not electrically connected with wireless headset 20 at this time).For wireless headset For 20, in the 1st and 2 kind of situation, before extracting wireless headset 20, the electricity of the non-inverting input terminal of the second comparison module C2 Pressure (the 1st kind of situation is first voltage, the 2nd kind of situation is I1*R2) is all larger than voltage (the second reference voltage of inverting input terminal VR2), therefore the second comparison module C2 exports high level；After extracting wireless headset 20, the same phase of the second comparison module C2 The voltage of input terminal (is 0, as shown in Fig. 2, dropping to voltage (the second ginseng for 0) being respectively less than inverting input terminal in t4 moment voltage Examine voltage VR2), therefore the second comparison module C2 exports low level.That is, in this process the second comparison module C2 output Level jumps to low level from high level.Based on this, when the second control module 22 detects the electricity of the second comparison module C2 output It is flat to jump to low level from high level, and switch sign is to disconnect, then and the second control module 22 determines wireless headset 20 and fills The electrical connection of electric box 10 disconnects (such as wireless headset 20 is extracted from charging box 10).

In one embodiment, it in order to protect charging box 10, is needed when the voltage of the power supply 12 of charging box 10 is lower than threshold value The output for closing DC-DC module 11 (can be the case that 1, when the voltage of power supply 12 is lower than first voltage threshold value, only The output of DC-DC module 11 is closed, but power supply 12 is still powered to the first control module 13, thus the first control mould in the case of this Block 13 still can control the turn-on and turn-off of first switch S1 by high level or low level；2, when the electricity of power supply 12 It forces down when second voltage threshold value (smaller than first voltage threshold value), is not simply turned off the output of DC-DC module 11, while power supply 12 Stop powering to remaining circuit), while first switch S1 conducting is controlled, in order to enable wireless headset 20 can be examined more accurately Being electrically connected between wireless headset 20 and charging box 10 is surveyed, when the second control module 22 detects that the second comparison module C2 is exported Level when jumping to low level from high level, the value of switch sign is revised as being connected by the second control module 22, then basis Value (being at this time conducting) control second switch S2 closure of switch sign, then detects the output electricity of the second comparison module C2 again Flat, the second control module 22 determines wireless headset 20 at this time further according to the output level and switch sign of the second comparison module C2 Electrical contact relationship between charging box 10.

In the case where charging box 10 has under-voltage protection, there are following several situations: 1, charging box 10 is to wireless Earphone 20 is disconnected (value of mode flags is voltage mode at this time) with being electrically connected for wireless headset 20 when charging；2, wireless headset 20 are disconnected (value of mode flags is constant current mode at this time) with being electrically connected for charging box 10 when filling with electricity；3, wireless headset 20 are disconnected preceding appearance under-voltage (wireless headset 20 is fully charged or underfill is electric) with being electrically connected for charging box 10.For wireless ear For machine 20, in the 1st and 2 kind of situation, before extracting wireless headset 20, the non-inverting input terminal of the second comparison module C2 Voltage (the 1st kind of situation is first voltage, the 2nd kind of situation is I1*R2) is all larger than voltage (the second reference voltage of inverting input terminal VR2), therefore the second comparison module C2 exports high level；After extracting wireless headset 20, the same phase of the second comparison module C2 The voltage (for 0) of input terminal is respectively less than the voltage (the second reference voltage VR2) of inverting input terminal, therefore the second comparison module C2 is equal Export low level.That is, the level of the second comparison module C2 output jumps to low level from high level in this process.Then such as Fruit second switch S2 conducting, the voltage (I2*R2) of the non-inverting input terminal of the second comparison module C2 is greater than reverse input end at this time Voltage (the second reference voltage VR2), therefore the second comparison module C2 exports high level.Based on this, when the second control module 22 is examined The level for measuring the second comparison module C2 output jumps to low level from high level, and switch sign is to disconnect, then the second control The value of switch sign is revised as being connected by molding block 22, then according to the value of switch sign (being at this time conducting) control second switch S2 conducting, the second control module 22 then detect the output level of the second comparison module C2 again, and then the second control module 22 is examined The output level is surveyed, if the output level is high level, the second control module 22 determines wireless headset 20 and charging box 10 Electrical connection disconnects (such as wireless headset 20 is extracted from charging box 10).In the 3rd kind of situation, before charging box 10 is under-voltage, the second ratio The voltage (for first voltage or I1*R2) of non-inverting input terminal compared with module C2 is greater than inverting input terminal voltage, and (second with reference to electricity Press VR2)；When charging box 10 is under-voltage, the first control module 13 controls DC-DC module 11 and stops output voltage, and controls the One switch S1 conducting, at this time the second comparison module C2 non-inverting input terminal voltage (i.e. charge output end POWEROUT voltage, be 0) it is less than the voltage (the second reference voltage VR2) of inverting input terminal, therefore the second comparison module C2 exports low level, such as Fig. 3 institute Show, drops to 0 from U1 in the charge voltage of output end POWEROUT and charging input end POWERIN of t3 moment；If immediately T4 moment of t3 second switch S2 is connected, the non-inverting input terminal voltage of the second comparison module C2 (is 0, such as Fig. 3 institute at this time Show, the t4 moment voltage is still 0) still less than the voltage of inverting input terminal (the second reference voltage VR2), therefore second compares mould Block C2 exports low level.Based on this, when the second control module 22 detects the level of the second comparison module C2 output from high level Low level is jumped to, and switch sign is to disconnect, then the value of switch sign is revised as being connected by the second control module 22, then According to value (being at this time conducting) control second switch S2 conducting of switch sign, the second control module 22 then detects the second ratio again Compared with the output level of module C2, then the second control module 22 detects the output level, if the output level is low level, the Two control modules 22 determine that wireless headset 20 is electrically connected with charging box 10, and charging box 10 is in under-voltage condition；If the output is electric It puts down as high level, then what the second control module 22 determined wireless headset 20 and charging box 10 is electrically connected disconnection.

In order to more accurately determine the electrical connection of wireless headset 20 and charging box 10 and take into account wireless headset 20 Power consumption, in addition to when the second comparison module C2 output level jumps to low level from high level control second switch S2 conducting, Switch sign can also be modified with certain frequency (such as to lead every 1ms or 2ms to control second switch S2 with certain frequency conducting It is logical), then the second control module 22 detects the output level of the second comparison module C2, and opening according to output level and at this time Close the electrical connection between mark judgement wireless headset 20 and charging box 10.For example, above-mentioned 3rd kind of situation is directed to, when second Control module 22 detects that the level of the second comparison module C2 output jumps to low level from high level, and switch sign is disconnected It opens, then the value of switch sign is revised as being connected by the second control module 22, then according to the value of switch sign (being at this time conducting) Second switch S2 conducting is controlled, the second control module 22 then detects the output level of the second comparison module C2 again, and then second Control module 22 detects the output level, if the output level is low level, the second control module 22 determines wireless headset 20 It is electrically connected with charging box 10, and charging box 10 is in under-voltage condition.If 20 ability of wireless headset is by user after a period of time Charging box 10 is extracted, when wireless headset 20 is pulled out charging box 10, the voltage of the non-inverting input terminal of the second comparison module C2 (for 0) it is less than inverting input terminal voltage (the second reference voltage VR2), therefore the second comparison module C2 exports low level；It opens when second When closing S2 closure, the voltage of the non-inverting input terminal of the second comparison module C2 is (for I2*R2, as shown in figure 3, it is defeated to charge at the t5 moment Enter to hold the voltage of POWERIN to be pulled to U5) it is greater than inverting input terminal voltage (the second reference voltage VR2), therefore second compares Module C2 exports high level.In consideration of it, switch sign is revised as being connected by the second control module 22 with certain frequency, then basis Switch sign controls second switch S2 conducting, the level of the second comparison module C2 output is then detected again, if second switch S2 is led Second comparison module C2 exports high level when the second comparison module C2 exports low level and second switch S2 conducting before logical, then Judgement wireless headset 20 is electrically connected disconnection with charging box 10, then is revised as disconnecting by switch sign again, and opened according to this Mark control second switch S2 is closed to disconnect；If the second comparison module C2 exports low level and second before second switch S2 is connected The second comparison module C2 still exports low level when switch S2 is connected, then determines that wireless headset 20 is still electrically connected with charging box 10, and Charging box 10 is under-voltage, then is revised as disconnecting by switch sign again, and controls second switch S2 according to the switch sign and disconnect.

To electrical connection between the two when in one embodiment, in order to cooperate the realization charging box 10 of wireless headset 20 under-voltage Relationship is detected, and further increases the under-voltage protection of charging box 10, and first switch S1 is opened using enhanced P-channel MOS Guan Guan, the first control module 13 exports the grid of grid control signal to enhanced P-channel MOS switch pipe, enhanced to control The conducting and disconnection of P-channel MOS switch pipe.When charging box 10 is under-voltage, it can close and be controlled including DC-DC module 11, first Circuit including module 13 etc. is all, therefore the grid control signal of enhanced P-channel MOS switch pipe is low level (0), enhancing The conducting of type P-channel MOS switch pipe.Consumption charging is not needed to the conducting of enhanced P-channel MOS switch pipe as it can be seen that realizing at this time The power of box 10, while realizing that detection provides the foundation for wireless headset 20.In one embodiment, source electrode and charging output end POWEROUT connection, drain electrode are connected to ground, and due to the on state characteristic of enhanced P-channel MOS switch pipe, I2*R2 is greater than enhancing The threshold voltage vt h (minimum differntial pressure needed for source electrode and drain electrode conducting between source electrode and grid) of type P-channel MOS switch pipe, In this way when charging box 10 enters under-voltage protection, and when second switch S2 conducting, enhanced P-channel MOS switch pipe can just be led It is logical.In this way, the first control module 13 can be actively to enhanced P-channel when the voltage of power supply 12 is less than first voltage threshold value The grid of MOS switch pipe applies low level so that enhanced P-channel MOS switch pipe is connected；And when the voltage of voltage 12 is less than the When two voltage thresholds, the first control module 13, which is exported to the level of the grid of enhanced P-channel MOS switch pipe, to be forced to be pulled to low electricity It is flat, so that it is also possible that enhanced P-channel MOS switch pipe is connected.

In one embodiment, the first reference voltage VR1 is smaller, in order to guarantee to be electrically connected with charging box 10 when wireless headset 20 Moment the first comparison module C1 output low level connect, the voltage for the output end POWEROUT that charges can be by a bleeder circuit The non-inverting input terminal of the first comparison module C1 is inputted after partial pressure again, it is assumed that partial pressure coefficient is k (less than 1), then has following relationship: VR1>k*I1*R2；In some cases, partial pressure coefficient can be equal to 1.However, the voltage of charging input end POWERIN then can be with Without the non-inverting input terminal for inputting the second comparison module C2 after the partial pressure of bleeder circuit again.

It is appreciated that the signal end that two input terminals of the first comparison module C1 connect can be exchanged mutually: first compares The non-inverting input terminal of module C1 is connect with the first reference voltage VR1, reverse input end is connect with charging output end POWEROUT, this Sample, the control logic of the first control module 13 are just opposite with previous embodiment (for example, when the high electricity of the first comparison module C1 output Usually, the first control module 13 determines that charging box 10 is electrically connected with wireless headset 20, and then controls the work of DC-DC module 11 and exist Voltage mode).Certainly, it can also increase by a reverse phase between the output end and the first control module 13 of the first comparison module C1 Device, in this way, the control logic of the first control module 13 is identical as previous embodiment.Similarly, two of the second comparison module C2 it is defeated The signal end for entering end connection can also be exchanged mutually, and details are not described herein.

In order to realize the control to current source 24, second switch S2 can be a part of current source 24, the second control mould Block 22 controls current source 24 with realizing by the conducting and disconnection of control second switch S2.

In above-mentioned each embodiment, the electrical connection for determining wireless headset 20 and charging box 10, wireless headset are realized 20 can further control wireless headset 20 and more operate, such as when wireless ear based on the electrical connection determined When machine 20 is electrically connected with charging box 10, disconnect the connection with mobile phone, break song of singing etc.；When judgement wireless headset 20 and charging box When 10 electrical connection disconnects, establish connection with mobile phone again, replay song etc..Equally, when wireless headset 20 and charging box When 10 electrical connections and disconnection electrical connection, charging box 10 can be according to the corresponding prompt of sending.

Although above-mentioned each embodiment is described in detail as an example with charging box 10 and wireless headset 20, Ke Yili Solution, charging box 10 can also be the charging unit of remaining any form.

It should be understood that above embodiments are only to illustrate the technical solution of the utility model, it is rather than its limitations, right For those skilled in the art, it can modify to technical solution illustrated in the above embodiments, or to part of skill Art feature is equivalently replaced；And all such modifications and replacement, it all should belong to the protection of the appended claims for the utility model Range.

Claims

1. a kind of circuit that can recognize with the wireless headset of charging unit electrical connection, characterized in that including the second detection control Molding block, current source, second switch, resistance, charging input end；The charging input end is used for the charging with charging unit and exports End in contact electrical connection；The current source is via the charging input end and resistance eutral grounding；

The second detection control module is used to make the electric current by controlling the second switch when switch sign is conducting Source exports the second electric current to flow through the resistance, makes the electric current by controlling the second switch when switch sign is to disconnect Source stops working；

The second detection control module is also used to be sentenced according to the level and the switch sign that detect the charging input end The electrical connection of the fixed wireless headset and the charging unit.

2. circuit as described in claim 1, characterized in that

The second detection control module is also used to be sentenced according to the level and the switch sign that detect the charging input end The electrical connection of the fixed wireless headset and the charging unit specifically:

The second detection control module is also used to according to the voltage for detecting the charging input end be high level, and described Switch sign is when disconnecting, and the second detection control module determines that the wireless headset is electrically connected with charging unit formation It connects.

3. circuit as described in claim 1, characterized in that

The second detection control module is also used to low according to detecting that the voltage of the charging input end is jumped to from high level The switching flag bits are set as being connected when level, and controls the second switch according to the switching flag bits and is connected；If The charging input end is high level, then the second detection control module determines the wireless headset and the charging unit Electrical connection disconnects.

4. circuit as described in claim 1, characterized in that

The second detection control module is also used to low according to detecting that the voltage of the charging input end is jumped to from high level The switching flag bits are set as being connected when level, and controls the second switch according to the switching flag bits and is connected；If The charging input end is low level, then the second detection control module determines the wireless headset and charging unit electricity Connection.

5. circuit as described in claim 1, characterized in that

After the second detection control module detects that the level of the charging input end jumps to low level from high level, The second detection control module with setpoint frequency for being executed: switch sign being revised as conducting and is led with controlling second switch It is logical；The second detection control module detects the level of the charging input end again, if the level of the charging input end is height Level, then determine the wireless headset and the charging unit is electrically connected disconnection；If the level of the charging input end is low Level then determines that the wireless headset is electrically connected with the charging unit.

6. circuit a method as claimed in any one of claims 1 to 5, characterized in that

The second detection control module includes the second control module and the second comparison module；The first of second comparison module Input terminal connects the charging input end, the second input terminal connects the second reference voltage, output end connection the second control mould Block；

Second control module is used for, and keeps the current source defeated by controlling the second switch when switch sign is conducting Second electric current out makes the current source stop working, Yi Jigen when switch sign is to disconnect by controlling the second switch The level of charging input end described in level detection according to second comparison module output；Wherein, the second electric current and the resistance Product be greater than second reference voltage.

7. circuit a method as claimed in any one of claims 1 to 5, characterized in that

The circuit of the wireless headset further includes anti-reverse conduction module, charging module, and the anti-reverse conduction module is for preventing Only the voltage of the charging module flows backward to the charging input end.

8. a kind of circuit of charging system, characterized in that circuit and the recognizable and described charging unit electricity including charging unit The circuit of the wireless headset of connection relationship；

The circuit of the wireless headset includes the second detection control module, current source, second switch, resistance, charging input end；Institute Charging input end is stated for being electrically connected with the charging of charging unit output end in contact；The current source is via the charging input end And resistance eutral grounding；

The circuit of the charging unit includes charging output end, first switch, and the charging output end is grounded by first switch； The first switch is used to be controlled system conducting when line under-voltage, is disconnected when the power supply is not under-voltage by control；

9. circuit as claimed in claim 8, characterized in that the first switch is enhanced P-channel MOS switch pipe, works as institute The first detection control module exports the grid of no-voltage to the enhanced P-channel MOS switch pipe when stating line under-voltage.

10. circuit as claimed in claim 8, characterized in that

The second detection control module is also used to according to the voltage for detecting the charging input end be high level, and described Switch sign is when disconnecting, and the second detection control module determines that the wireless headset is electrically connected with charging unit formation It connects；Alternatively,

The second detection control module is also used to low according to detecting that the voltage of the charging input end is jumped to from high level The switching flag bits are set as being connected when level, and controls the second switch according to the switching flag bits and is connected；If The charging input end is high level, then the second detection control module determines the wireless headset and the charging unit Electrical connection disconnects, if the charging input end is low level, the second detection control module determine the wireless headset with The charging unit electrical connection；Alternatively,

11. the circuit as described in claim 8-10 is any, characterized in that

The second detection control module includes the second control module and the second comparison module；

The first input end of second comparison module connects the charging input end, the second input terminal connection second with reference to electricity Pressure, output end connect second control module；

12. the circuit as described in claim 8-10 is any, characterized in that

13. a kind of circuit that can recognize with the wireless headset of charging unit electrical connection, characterized in that including the second control mould Block, the second comparison module, current source, second switch, resistance, charging input end, anti-reverse conduction module；The charging input end It is electrically connected for the charging output end in contact with charging unit；The current source is via the charging input end and resistance eutral grounding；

Second control module is used for, and keeps the current source defeated by controlling the second switch when switch sign is conducting The second electric current stops the current source by controlling the second switch when switch sign is to disconnect to flow through the resistance out Only work；

Charging input end described in the level detection that second control module is also used to be exported according to second comparison module Level, and determine that the wireless headset is filled with described according to the level of the charging input end of detection and the switch sign The electrical connection of electric installation.

14. a kind of wireless headset that can recognize with charging unit electrical connection, characterized in that including such as claim 1-7,13 Any circuit.

15. a kind of charging system, characterized in that including the circuit as described in claim 8-12 is any.

16. a kind of circuit that can recognize with the charging unit of wireless headset electrical connection, characterized in that include: DC-DC mould Block, the first detection control module, charging output end；

The output end of the DC-DC module is connect with charging output end, and the charging output end is for the charging with wireless headset Input end in contact electrical connection；The first detection control module is used for will when the electric current that the DC-DC module exports is equal to zero Mode flags are set as constant current mode, and the DC-DC module is used to work in constant current mode according to the mode flags；

The first detection control module is used to detect that the voltage of the charging output end to jump to low level from high level, and And the mode flags determine that the charging unit and the wireless headset are formed and are electrically connected, by the mould when being constant current mode Formula flag bit is set as voltage mode, and controls the DC-DC module according to the voltage mode and export first voltage.

17. circuit as claimed in claim 16, characterized in that further include first switch, the charging output end passes through first Switch ground connection；

The first switch is used to be controlled system conducting when line under-voltage, is disconnected when the power supply is not under-voltage by control.

18. circuit as claimed in claim 17, characterized in that the first switch is enhanced P-channel MOS switch pipe, when First detection control module described in when the line under-voltage exports the grid of no-voltage to the enhanced P-channel MOS switch pipe.

19. circuit as claimed in claim 16, characterized in that

The first detection control module includes the first control module and the first comparison module；The first of first comparison module Input terminal connection charging output end, the second input terminal connects the first reference voltage, output end is connect with the first control module；It is described First control module is used for the level of the charging input end according to the level detection that first comparison module exports.

20. circuit as claimed in claim 16, characterized in that

The first detection control module is also used to determine the charging when the electric current that the DC-DC module exports is equal to zero Device is electrically connected disconnection with the wireless headset.

21. a kind of circuit of charging system, including can recognize circuit and nothing with the charging unit of wireless headset electrical connection The circuit of line earphone, characterized in that

The circuit of the charging unit includes: DC-DC module, the first detection control module, charging output end；The DC-DC mould The output end of block is connect with charging output end；The first detection control module is used for the electric current when DC-DC module output Constant current mode is set by mode flags when equal to zero, the DC-DC module is used to work in constant current according to the mode flags Mode is to export the first electric current；

The circuit of the wireless headset includes: resistance, charging input end；The charging input end is via the resistance eutral grounding；Institute Charging output end is stated to be used to contact electrical connection with the charging input end；

22. circuit as claimed in claim 21, characterized in that

The first detection control module includes the first control module and the first comparison module；The first of first comparison module Input terminal connection charging output end, the second input terminal connects the first reference voltage, output end is connect with the first control module；

The product of first electric current, the resistance and partial pressure coefficient is less than first reference voltage；

First control module is used for the electricity of the charging input end according to the level detection that first comparison module exports It is flat.

23. circuit as claimed in claim 22, characterized in that

The circuit of the wireless headset further includes the second detection control module；

The product of first electric current and the resistance is greater than second reference voltage, the product of the second electric current and the resistance Greater than second reference voltage；

Second control module is used for the electricity of the charging input end according to the level detection that second comparison module exports The flat electrical connection to determine the wireless headset and charging unit.

24. circuit as claimed in claim 22, characterized in that

The circuit of the charging unit further includes first switch, and the charging output end is grounded by first switch；Described first Switch is disconnected when the power supply is not under-voltage by control for system conducting controlled when line under-voltage；

The circuit of the wireless headset further include: the second detection control module, current source, second switch；The current source via The charging input end and resistance eutral grounding；The second detection control module is used to control institute when switch sign to pass through when conducting Stating second switch makes the current source export the second electric current, makes institute by controlling the second switch when switch sign is disconnects Current source is stated to stop working；

The second detection control module is also used to basis and detects that the charging input end level and the switch sign are sentenced The electrical connection of the fixed wireless headset and the charging unit.

25. circuit as claimed in claim 24, characterized in that

26. circuit as claimed in claim 25, characterized in that

The product of first electric current and the resistance is greater than second reference voltage, second electric current and the resistance Product is greater than second reference voltage；

The second detection control module is also used to basis and detects that the charging input end level and the switch sign are sentenced The electrical connection of the fixed wireless headset and the charging unit specifically:

Second control module is used for the electricity of the charging input end according to the level detection that second comparison module exports The flat and described switch sign is to determine the electrical connection of the wireless headset and charging unit.

27. the circuit as described in claim 21-26 is any, characterized in that

The circuit of the wireless headset further includes anti-reverse conduction module, and the anti-reverse conduction module is for preventing charging module Voltage flow backward to the charging input end.

28. circuit as claimed in claim 26, characterized in that

Second control module is used to detect that the voltage of the charging input end to be high level, and the switch sign is to disconnect When, determine that the wireless headset is electrically connected with charging unit formation；Alternatively,

When second control module is used to detect that the voltage of the charging input end jumps to low level from high level, by institute It states switching flag bits to be set as being connected, and controls the second switch according to the switching flag bits and be connected, if the charging is defeated Entering end is high level, then second control module is used to determine that the wireless headset and being electrically connected for the charging unit to be disconnected It opens, if the charging input end is low level, second control module is for determining the wireless headset and the charging Device electrical connection；Alternatively,

It is described after second control module detects that the level of the charging input end jumps to low level from high level Second detection control module with setpoint frequency for being executed: switch sign being revised as conducting to control second switch conducting；Institute The level that the second control module detects the charging input end again is stated, if the level of the charging input end is high level, is sentenced The fixed wireless headset is electrically connected disconnection with the charging unit；If the level of the charging input end is low level, sentence The fixed wireless headset is electrically connected with the charging unit.

29. the circuit as described in claim 24,25,26,28 is any, characterized in that

The first switch be enhanced P-channel MOS switch pipe, when the line under-voltage described in first detection control module it is defeated Out no-voltage to the enhanced P-channel MOS switch pipe grid.

30. the circuit as described in claim 24,25,26,28 is any, characterized in that

When the electric current of DC-DC module output is equal to zero, the first detection control module determines the charging unit and institute The electrical connection for stating wireless headset disconnects.

31. a kind of circuit of charging system, including can recognize circuit and nothing with the charging unit of wireless headset electrical connection The circuit of line earphone, characterized in that

The circuit of the charging unit includes: DC-DC module, the first comparison module, the first control module, first switch, charging Output end, power supply；The circuit of the wireless headset include the second comparison module, the second control module, current source, second switch, Resistance, charging input end；The charging output end is used to contact electrical connection with the charging input end；

The input terminal of the DC-DC module is connect with the power supply, output end is connect with charging output end, and charging output end passes through First switch ground connection；The first input end connection charging output end of first comparison module, the first ginseng of the second input terminal connection Examine voltage, output end is connect with the first control module；The first switch is used to be controlled system conducting when the line under-voltage；Institute Current source is stated via the charging input end and resistance eutral grounding, the first input end of second comparison module connects the charging Input terminal, the second input terminal connect the second reference voltage, output end connects second control module；Second control module For making the current source export the second electric current by controlling the second switch when switch sign is conducting, when switch is marked Will is so that the current source is stopped working by controlling the second switch when disconnecting；

First control module is used to determine the charging unit and institute when the electric current that the DC-DC module exports is equal to zero The electrical connection for stating wireless headset disconnects, and sets constant current mode for mode flags, and the DC-DC module is used for according to the mould Formula mark works in constant current mode to export the first electric current；

First control module is used for by detecting the output end that charges described in the signal determining that first comparison module exports Voltage jump to low level from high level, and when the mode flags are constant current mode, first control module determines The charging unit is electrically connected with the wireless headset, sets voltage mode for the mode flags position, and according to the electricity Die pressing type controls the DC-DC module and exports first voltage；

Second control module is also used to basis and detects that the charging input end level and the switch sign determine institute State the electrical connection of wireless headset Yu the charging unit；

Wherein, the product of first electric current, the resistance and partial pressure coefficient is less than first reference voltage, first electricity Stream and the product of the resistance are greater than second reference voltage, and the product of second electric current and the resistance is greater than described the Two reference voltages.

32. a kind of circuit that can recognize with the charging unit of wireless headset electrical connection, characterized in that include: DC-DC mould Block, the first comparison module, the first control module, first switch, charging output end, power supply；

The input terminal of the DC-DC module is connect with the power supply, output end is connect with charging output end, and charging output end passes through First switch ground connection；The first input end connection charging output end of first comparison module, the first ginseng of the second input terminal connection Examine voltage, output end is connect with the first control module；The first switch is used to be controlled system conducting when the line under-voltage；Institute Charging output end is stated to be used to contact electrical connection with the charging input end of wireless headset；

First control module is used to determine the charging unit and institute when the electric current that the DC-DC module exports is equal to zero The electrical connection for stating wireless headset disconnects, and sets constant current mode for mode flags, and the DC-DC module is used for according to the mould Formula mark works in constant current mode；

First control module is used for by detecting the output end that charges described in the signal determining that first comparison module exports Voltage jump to low level from high level, and when the mode flags are constant current mode, first control module determines The formation of the charging unit and the wireless headset is electrically connected, and sets voltage mode for the mode flags position, and according to The voltage mode controls the DC-DC module and exports first voltage.

33. a kind of can recognize and the charging unit of wireless headset electrical connection, characterized in that including such as claim 16-20, 32 any circuits.

34. a kind of charging system, characterized in that including the circuit as described in claim 21-31 is any.