CN111800709A - Automatic power on/off circuit and bluetooth headset - Google Patents
Automatic power on/off circuit and bluetooth headset Download PDFInfo
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- CN111800709A CN111800709A CN201910648962.0A CN201910648962A CN111800709A CN 111800709 A CN111800709 A CN 111800709A CN 201910648962 A CN201910648962 A CN 201910648962A CN 111800709 A CN111800709 A CN 111800709A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
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Abstract
The utility model is suitable for bluetooth headset technical field provides an automatic on-off circuit and bluetooth headset, and the automatic on-off circuit includes power enable port, shutdown control signal output port, start control signal output port, positive power input port, first electric capacity, pull-down module, pull-up module and electronic switch module. And a power supply enabling port is added as a detection end for putting in or taking out the charging box, and the Bluetooth headset is controlled to be turned on or turned off according to signals output by the power-off control signal output port and the power-on control signal output port. This automatic on-off circuit is not restricted to whether the box that charges has the electricity, and the homoenergetic realizes: the Bluetooth headset is placed in the charging box to be automatically powered off, and is taken out from the charging box to be automatically powered on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
Description
Technical Field
This application belongs to bluetooth headset technical field, especially relates to an automatic switch machine circuit and a bluetooth headset.
Background
At present, the existing bluetooth headset, especially the bluetooth TWS headset, such as the high-pass bluetooth TWS headset, has two pins of VBUS and GND, and the headset is put into the charging box to realize the shutdown and charging of the headset, and the headset is taken out of the charging box to realize the startup and connection with the mobile phone. The normal condition based on there is the electricity in the box that charges under the above-mentioned condition, however, does not have under this special condition of electricity at the box that charges, and unable auto-power-off in the box that charges is put into to the earphone, and the earphone is taken out from the box that charges and can't auto-power-on, can only realize the switch on and off through pressing the mechanical button on the earphone under this kind of condition, has greatly reduced user experience.
Disclosure of Invention
In view of this, the present application provides an automatic power on/off circuit and a bluetooth headset, so as to solve the problem that the bluetooth headset cannot be automatically powered on/off under the condition that the charging box is not powered.
A first aspect of an embodiment of the present application provides an automatic power on/off circuit, which is applied to a bluetooth headset, the automatic power on/off circuit including:
a power supply enabling port connected with the grounding end of the charging box when the charging box is put in;
a power-off control signal output port for controlling the power-off of the Bluetooth headset when the power-off control signal is accessed;
a power-on control signal output port for controlling the power-on of the Bluetooth headset when the power-on control signal is accessed;
a positive power supply input port for connecting a positive power supply;
a first capacitor;
a pull-down module;
a pull-up module; and
an electronic switch module;
the power supply enabling port is connected with one end of the first capacitor, the other end of the first capacitor is connected with one end of the pull-down module, the other end of the pull-down module is grounded, the positive power supply input port is connected with one end of the first capacitor through the pull-up module, the one end of the power supply enabling port is connected with the first capacitor, the power-off control signal output port is connected with one end of the power supply enabling port, the first capacitor is connected with the connection point of the pull-down module, the control end of the switch tube is connected with the positive power supply input port, the input end of the electronic switch module is connected with the output end of the electronic switch module, and the power-on control signal output port is connected with the output end of.
Furthermore, the automatic power on/off circuit further comprises a first diode, the first diode is arranged on a connection line between the power off control signal output port and the first capacitor, an anode of the first diode is connected with the power off control signal output port, and a cathode of the first diode is connected with the first capacitor.
Furthermore, the automatic on-off circuit further comprises a second diode, an anode of the second diode is grounded, and a cathode of the second diode is connected with a connection point of the first capacitor and the pull-down module.
Furthermore, the automatic power on/off circuit further comprises a first voltage regulator tube, and the power supply enabling port is grounded through the first voltage regulator tube.
Further, the automatic power on/off circuit further comprises a second capacitor, and the power supply enabling port is grounded through the second capacitor.
Further, the pull-down module is a first resistor.
Further, the pull-up module is a second resistor.
Further, the shutdown control signal is a low level signal, and the startup control signal is a high level signal.
Furthermore, the electronic switch module is a triode.
A second aspect of an embodiment of the present application provides a bluetooth headset, including:
a Bluetooth earphone body; and
the automatic switch circuit is arranged on the Bluetooth headset body and provided as the first aspect of the embodiment of the application.
Compared with the prior art, the embodiment of the application has the advantages that: the method comprises the following steps that a power supply enabling port is added to serve as a detection end for placing in or taking out of a charging box, when the Bluetooth headset is placed in the charging box, the power supply enabling port is connected with a grounding end in the charging box and becomes a low level, the voltage of one end, used for being connected with the power supply enabling port, of a first capacitor can be slowly reduced to the low level, and then the Bluetooth headset is automatically shut down under the effect of a shutdown control signal output by a shutdown control signal output port; when the Bluetooth headset is taken out of the charging box, the power supply enabling port is suspended, one end of the first capacitor, which is used for being connected with the power supply enabling port, becomes a high level due to the action of the positive power supply input port, then, the voltage of the connecting point position of the first capacitor and the pull-down module rises, when the voltage rises to a certain value, the electronic switch module is conducted, the positive power supply input port is connected with the power-on control signal output port, and the Bluetooth headset is automatically started under the action of the power-on control signal output port outputting the power-on control signal. Therefore, the automatic switching circuit is not limited to whether the charging box is charged or not, and can realize that whether the charging box is charged or not: the Bluetooth headset is placed into the charging box to be automatically turned off, and is taken out from the charging box to be automatically turned on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic diagram of a first circuit structure of an automatic on-off circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a second circuit structure of an automatic on-off circuit according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
In order to explain the technical means described in the present application, the following description will be given by way of specific embodiments.
Fig. 1 is a schematic diagram of a first circuit structure of an automatic on-off circuit according to an embodiment of the present application. For convenience of explanation, only portions related to the embodiments of the present application are shown. The automatic switching circuit is applied to the Bluetooth headset. As shown in fig. 1, the automatic switching circuit includes a power enable port 101, a shutdown control signal output port 102, a startup control signal output port 103, a positive power input port 104, a first capacitor 105, a pull-down module 106, a pull-up module 107, and an electronic switching module 108.
Wherein, there is the earthing terminal in the box that charges with bluetooth headset adaptation, and power enable port 101 is used for being connected with the earthing terminal in the box that charges when putting into the box that charges, so, when bluetooth headset places in the box that charges, power enable port 101 can be connected with the earthing terminal in the box that charges, of course, when bluetooth headset takes out from the box that charges, power enable port 101 just can not be connected with the earthing terminal in the box that charges. The shutdown control signal output port 102 is configured to control the bluetooth headset to shutdown when the shutdown control signal is accessed, where the shutdown control signal is a low level signal, and then, when the shutdown control signal output port 102 outputs a low level, the bluetooth headset controls the bluetooth headset to shutdown according to the low level. The power-on control signal output port 103 is used for controlling the bluetooth headset to be powered on when the power-on control signal is accessed, and the power-on control signal is a high level signal, so that when the power-on control signal output port 103 outputs a high level, the bluetooth headset controls the bluetooth headset to be powered on according to the high level. The positive power input port 104 is for connection to a positive power supply, such as a supply voltage VBAT.
As shown in fig. 1, the power enable port 101 is connected to one end of a first capacitor 105, the other end of the first capacitor 105 is connected to one end of a pull-down module 106, the other end of the pull-down module 106 is grounded, the positive power input port 104 is connected to one end of the first capacitor 105 through a pull-up module 107, the end of the first capacitor 105, which is connected to the power enable port 101, is connected to the shutdown control signal output port 102, a connection point of the first capacitor 105 and the pull-down module 106 is connected to a control end of the electronic switch module 108, the positive power input port 104 is connected to an input end of the electronic switch module 108, and an output end of the electronic switch module 108 is connected to the startup control signal output port 103. Each port may be a connection terminal having a certain structure, or may be only one end of a connection line. Furthermore, the length of the connection lines involved can be set according to the actual requirements, and if the automatic switching circuit is made as an integrated circuit, the connection lines can be directly integrated on the integrated circuit board, but the connection relationship between the components is not changed no matter what form the automatic switching circuit exists.
The power enable port 101 is used as a detection end for putting in or taking out the charging box of the bluetooth headset, and the power enable port 101 is at a high level when the bluetooth headset normally works. Before the bluetooth headset is placed in the charging box, the first capacitor 105 is in a fully charged state. When the bluetooth headset is placed in the charging box, the power enable port 101 is connected with the grounding end of the charging box and becomes a low level, the voltage of one end of the first capacitor 105, which is used for connecting the power enable port 101, is slowly reduced to the low level, then the shutdown control signal output port 102 outputs the low level, and the bluetooth headset is controlled to be automatically shut down under the action of the low level; when the bluetooth headset is taken out of the charging box, the power enable port 101 is suspended, one end of the first capacitor 105, which is used for being connected with the power enable port 101, becomes a high level due to the action of the positive power input port 104, then, the voltage at the position of the connection point of the first capacitor 105 and the pull-down module 106 gradually rises, when the voltage rises to a certain value, the electronic switch module 108 is conducted, the positive power input port 104 is connected with the power-on control signal output port 103, so that the power-on control signal output port outputs the high level, and the bluetooth headset is controlled to be automatically started under the action of the high level.
Therefore, the automatic switching circuit is not limited to whether the charging box is charged or not, and can realize that whether the charging box is charged or not: the Bluetooth headset is placed into the charging box to be automatically turned off, and is taken out from the charging box to be automatically turned on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
Fig. 2 is a schematic diagram of a second circuit structure of the automatic on-off circuit according to an embodiment of the present application. For convenience of explanation, only portions related to the embodiments of the present application are shown. The automatic switching circuit can be suitable for a common Bluetooth headset and can also be suitable for a TWS Bluetooth headset. The automatic switching circuit comprises a power supply enabling port, a shutdown control signal output port, a startup control signal output port, a positive power supply input port, a first capacitor, a pull-down module, a pull-up module and an electronic switching module. The POWER enable port corresponds to the POWER _ EN pin in fig. 2, the POWER-off control signal output port corresponds to the PIO _21 pin in fig. 2, the POWER-on control signal output port corresponds to the SYS _ CNTRL pin in fig. 2, the positive POWER input port corresponds to the VBAT pin in fig. 2, and the first capacitor corresponds to the capacitor C43 in fig. 2. The pull-down module may be a resistor, or may be formed by at least two resistors connected in series, in parallel, or in series and parallel, and in one embodiment, the pull-down module is a resistor, which corresponds to the resistor R15 in fig. 2. The pull-up module may be a resistor, or may be formed by at least two resistors connected in series, in parallel, or in series-parallel, and in one embodiment, the pull-up module is a resistor, which corresponds to the resistor R6 in fig. 2. The electronic switch module may include at least one switch tube, or may be composed of at least two switch tubes, or a combination of a switch tube and a resistor, and in one embodiment, the electronic switch module is a switch tube, which corresponds to the switch tube Q1 in fig. 2, and the switch tube Q1 may be a triode, or may be another type of switch tube such as a MOS tube.
The charging box matched with the Bluetooth headset is provided with a grounding end, the POWER _ EN pin is used for being connected with the grounding end in the charging box when the charging box is placed in the charging box, so that the Power _ EN pin can be connected with the grounding end of the charging box when the Bluetooth headset is placed in the charging box, and certainly, when the Bluetooth headset is taken out of the charging box, the Power _ EN pin cannot be connected with the grounding end of the charging box. The PIO _21 pin is used for controlling the Bluetooth headset to be powered off when the power-off control signal is accessed, wherein the power-off control signal is a low level signal, and then when the PIO _21 pin outputs a low level signal, the Bluetooth headset controls the Bluetooth headset to be powered off according to the low level signal. The SYS _ CNTRL pin is used for controlling the Bluetooth headset to be powered on when the power-on control signal is accessed, the power-on control signal is a high level signal, and then when the SYS _ CNTRL pin outputs a high level, the Bluetooth headset controls the Bluetooth headset to be powered on according to the high level signal. The VBAT pin is used to connect a positive power supply, i.e., a supply voltage VBAT.
As shown in fig. 2, the POWER _ EN pin is connected to one end of a capacitor C43, the other end of the capacitor C43 is connected to one end of a resistor R15, the other end of the resistor R15 is grounded, the VBAT pin is connected to one end of a capacitor C43 through a resistor R6, one end of a capacitor C43 connected to the POWER _ EN pin is connected to the pin PIO _21, a connection point of the capacitor C43 and the resistor R15 is connected to a control end of a switch Q1, the VBAT pin is connected to an input end of the switch Q1, and an output end of the switch Q1 is connected to the SYS _ CNTRL pin. In fig. 2, the 1# position is a terminal of the capacitor C43 for connecting the POWER _ EN pin, the 2# position is a pin PIO _21, the 3# position is a connection point of the capacitor C43 and the resistor R15, and the 4# position is a pin SYS _ CNTRL.
In one embodiment, the automatic switching circuit further includes a first diode, corresponding to diode D8 in fig. 2, diode D8 is disposed on the connection line between pin PIO _21 and capacitor C43, the anode of diode D8 is connected to pin PIO _21, and the cathode of diode D8 is connected to capacitor C43. The diode D8 has an isolation function, and when the 1# position voltage is higher than the 2# position voltage during normal operation, the 2# position will also become low according to the characteristics of the diode D9 when the 1# position becomes low. Of course, the diode D8 is provided as an optimized embodiment, and as another embodiment, the diode D8 may not be provided.
In one embodiment, the automatic switching circuit further comprises a second diode corresponding to the diode D9 in fig. 2, the anode of the diode D9 is grounded, and the cathode of the diode D9 is connected to the connection point of the capacitor C43 and the resistor R15. The diode D9 is provided to form a discharge circuit with the capacitor C43, so as to accelerate the 1# position voltage to low level. Of course, as another embodiment, if the discharge speed of the capacitor C43 still meets the requirement without the diode D9, the diode D9 may not be provided.
In one embodiment, the automatic switching circuit further comprises a first voltage regulator, corresponding to voltage regulator D4 in fig. 2, and the POWER _ EN pin is grounded through a voltage regulator D4. The voltage regulator tube D4 can perform the function of voltage regulation, but it goes without saying that the voltage regulator tube D4 may be provided as another embodiment.
In one embodiment, the automatic switching circuit further comprises a second capacitor, corresponding to the capacitor C19 in fig. 2, and the POWER _ EN pin is grounded through the capacitor C19. The capacitor C19 can function as a filter, but the capacitor C19 may not be provided as an alternative embodiment.
One specific parameter of the relevant component in fig. 2 is given below, such as: the electric parameter of the capacitor C43 is 2.2uF/16V, the electric parameter of the resistor R15 is 10M omega, the electric parameter of the resistor R6 is 560K omega, the models of the diodes D8 and D9 are BR521G-30, the model of the switch tube Q1 is CJ1012, and the model of the voltage regulator tube D4 is ESD9B 5. Of course, the parameters of each component can be set specifically according to actual conditions. In addition, fig. 2 also relates to other parts, such as VBUS pin, GND pin, 1V8_ SMPS pin and components associated with these pins (i.e. a voltage regulator tube D3 and a resistor R5), and since these parts belong to other components of the bluetooth headset and are not related to the automatic switching circuit, the details are not repeated here.
The POWER _ EN pin is used as a detection end for putting in or taking out the charging box of the Bluetooth headset, and the POWER _ EN pin is at a high level when the Bluetooth headset works normally. Before the bluetooth headset is placed in the charging box, the capacitor C43 is fully charged. After the bluetooth headset is placed in the charging box, the POWER _ EN pin is connected with the grounding end of the charging box, the POWER _ EN pin is grounded and becomes low level, and the 1# position voltage, namely the voltage of one end of the capacitor C43 used for connecting the POWER _ EN pin, can be slowly reduced, so that the reduction speed of the 1# position voltage is accelerated under the action of the diode D9, and the voltage becomes low level. When the voltage of the 1# position is larger than the voltage of the 2# position during normal work, when the voltage of the 1# position becomes a low level, according to the characteristic of the diode D9, the voltage of the 2# position also becomes a low level at the same time, that is, the PIO _21 pin outputs the low level, the low level is output to a corresponding control port on the bluetooth headset, the bluetooth headset controls automatic shutdown under the effect of the low level, for example, when the GPIO port of the bluetooth headset detects the IO _21 pin output low level, the shutdown is automatically controlled. When the bluetooth earphone is taken out of the charging box, the POWER _ EN pin is suspended, the 1# position voltage becomes high level due to the action of a positive POWER supply of the VBAT pin, the capacitor C43 and the resistor R15 form an RC charging circuit, the capacitor C43 is charged, the 3# position voltage, namely, the voltage at the connection point of the capacitor C43 and the resistor R15 gradually rises, when the voltage rises to a certain value, the switching tube Q1 is turned on, the VBAT pin is connected with the SYS _ CNTRL pin, so that the 4# position voltage is equal to the VBAT pin level (the capacitance value of the capacitor C43 and the resistance value of the resistor R15 can be adjusted according to actual needs, and further the on-off time of the switching tube Q1 is controlled), the SYS _ CNTRL pin outputs high level, and the high level is output to a corresponding control port on the bluetooth earphone, and the bluetooth earphone is controlled to be automatically turned on under the action of.
Therefore, the automatic switching circuit is not limited to whether the charging box is charged or not, and can realize that whether the charging box is charged or not: the Bluetooth headset is placed into the charging box to be automatically turned off, and is taken out from the charging box to be automatically turned on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
The second embodiment of the present application provides a bluetooth headset, which includes an automatic power on/off circuit, and of course, in addition to the automatic power on/off circuit, the bluetooth headset further includes a bluetooth headset body, that is, other parts in the bluetooth headset, such as a control part related to automatic power on/off, specifically may be a controller, and the controller is used for controlling the bluetooth headset to be powered on/off. A first circuit structure of the automatic switching circuit is shown in fig. 1. As shown in fig. 1, the automatic switching circuit includes a power enable port 101, a shutdown control signal output port 102, a startup control signal output port 103, a positive power input port 104, a first capacitor 105, a pull-down module 106, a pull-up module 107, and an electronic switching module 108. The output of the power-off control signal output port 102 and the output of the power-on control signal output port 103 are connected with the controller.
Wherein, there is the earthing terminal in the box that charges with bluetooth headset adaptation, and power enable port 101 is used for being connected with the earthing terminal in the box that charges when putting into the box that charges, so, when bluetooth headset places the box that charges, power enable port 101 can be connected with the earthing terminal in the box that charges, of course, when bluetooth headset takes out from the box that charges, power enable port 101 just can't be connected with the earthing terminal in the box that charges. The shutdown control signal output port 102 is configured to control the bluetooth headset to shutdown when the shutdown control signal is accessed, where the shutdown control signal is a low level signal, and then, when the shutdown control signal output port 102 outputs a low level, the controller may control the bluetooth headset to shutdown according to the low level. The power-on control signal output port 103 is used for controlling the bluetooth headset to be powered on when the power-on control signal is accessed, and the power-on control signal is a high-level signal, so that when the power-on control signal output port 103 outputs a high level, the controller can control the bluetooth headset to be powered on according to the high level. The positive power input port 104 is for connection to a positive power supply, such as a supply voltage VBAT.
As shown in fig. 1, the power enable port 101 is connected to one end of a first capacitor 105, the other end of the first capacitor 105 is connected to one end of a pull-down module 106, the other end of the pull-down module 106 is grounded, the positive power input port 104 is connected to one end of the first capacitor 105 through a pull-up module 107, the end of the first capacitor 105, which is connected to the power enable port 101, is connected to the shutdown control signal output port 102, a connection point of the first capacitor 105 and the pull-down module 106 is connected to a control end of the electronic switch module 108, the positive power input port 104 is connected to an input end of the electronic switch module 108, and an output end of the electronic switch module 108 is connected to the startup control signal output port 103. Each port may be a connection terminal having a certain structure, or may be only one end of a connection line. Furthermore, the length of the connection lines involved can be set according to the actual requirements, if the automatic switching circuit is made as an integrated circuit, the connection lines may be directly integrated on the integrated circuit board, but the connection relationship between the components is not changed no matter what form the automatic switching circuit exists.
The power enable port 101 is used as a detection end for putting in or taking out the charging box of the bluetooth headset, and the power enable port 101 is at a high level when the bluetooth headset normally works. Before the bluetooth headset is placed in the charging box, the first capacitor 105 is in a fully charged state. When the bluetooth headset is placed in the charging box, the power enable port 101 is connected with the ground terminal of the charging box and becomes a low level, the voltage of one end of the first capacitor 105, which is used for connecting the power enable port 101, will slowly decrease to the low level, then the shutdown control signal output port 102 outputs the low level, and the controller controls automatic shutdown according to the low level; when the bluetooth headset is taken out of the charging box, the power enable port 101 is suspended, one end of the first capacitor 105, which is used for being connected with the power enable port 101, becomes a high level due to the action of the positive power input port 104, then, the voltage at the position of the connection point of the first capacitor 105 and the pull-down module 106 gradually rises, when the voltage rises to a certain value, the electronic switch module 108 is conducted, the positive power input port 104 is connected with the power-on control signal output port 103, so that the power-on control signal output port outputs the high level, and the controller controls automatic power-on according to the high level.
In the above, the automatic control of the power on/off is realized by the controller in the bluetooth headset, and of course, as another embodiment, the power off control signal output port 102 and the power on control signal output port 103 may also be output and connected to a specific control circuit, and the power on/off is controlled according to the level signals output by the power off control signal output port 102 and the power on control signal output port 103.
Therefore, the automatic switching circuit is not limited to whether the charging box is charged or not, and can realize that whether the charging box is charged or not: the Bluetooth headset is placed into the charging box to be automatically turned off, and is taken out from the charging box to be automatically turned on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
The second embodiment of the present application provides another bluetooth headset, which may be a general bluetooth headset or a TWS bluetooth headset. The bluetooth headset comprises an automatic power on/off circuit, and of course, in addition to the automatic power on/off circuit, the bluetooth headset further comprises a bluetooth headset body, namely, other parts in the bluetooth headset, such as a control part related to automatic power on/off, specifically, the bluetooth headset body can be a controller, and the controller is used for controlling the bluetooth headset to be powered on/off. The second circuit structure of the automatic switching circuit is shown in fig. 2. The automatic switching circuit comprises a power supply enabling port, a shutdown control signal output port, a startup control signal output port, a positive power supply input port, a first capacitor, a first resistor, a second resistor and a switching tube. The POWER enable port corresponds to the POWER _ EN pin in fig. 2, the POWER-off control signal output port corresponds to the PIO _21 pin in fig. 2, the POWER-on control signal output port corresponds to the SYS _ CNTRL pin in fig. 2, the positive POWER input port corresponds to the VBAT pin in fig. 2, and the first capacitor corresponds to the capacitor C43 in fig. 2. The pull-down module may be a resistor, or may be formed by at least two resistors connected in series, in parallel, or in series and parallel, and in one embodiment, the pull-down module is a resistor, which corresponds to the resistor R15 in fig. 2. The pull-up module may be a resistor, or may be formed by at least two resistors connected in series, in parallel, or in series-parallel, and in one embodiment, the pull-up module is a resistor, which corresponds to the resistor R6 in fig. 2. The electronic switch module may include at least one switch tube, or may be composed of at least two switch tubes, or a combination of a switch tube and a resistor, and in one embodiment, the electronic switch module is a switch tube, which corresponds to the switch tube Q1 in fig. 2, and the switch tube Q1 may be a triode, or may be another type of switch tube such as a MOS tube. And the output of the PIO _21 pin and the SYS _ CNTRL pin is connected with a controller.
The charging box matched with the Bluetooth headset is provided with a grounding end, the POWER _ EN pin is used for being connected with the grounding end of the charging box when the charging box is placed in the charging box, so that the Power _ EN pin can be connected with the grounding end of the charging box when the Bluetooth headset is placed in the charging box, and certainly, the Power _ EN pin cannot be connected with the grounding end of the charging box when the Bluetooth headset is taken out of the charging box. The PIO _21 pin is used for controlling the Bluetooth headset to be powered off when the power-off control signal is accessed, wherein the power-off control signal is a low level signal, and then when the PIO _21 pin outputs a low level, the controller can control the Bluetooth headset to be powered off according to the low level. The SYS _ CNTRL pin is used for controlling the Bluetooth headset to be powered on when the power-on control signal is accessed, the power-on control signal is a high level signal, and then when the SYS _ CNTRL pin outputs a high level, the controller can control the Bluetooth headset to be powered on according to the high level. The VBAT pin is used to connect a positive power supply, i.e., a supply voltage VBAT.
As shown in fig. 2, the POWER _ EN pin is connected to one end of a capacitor C43, the other end of the capacitor C43 is connected to one end of a resistor R15, the other end of the resistor R15 is grounded, the VBAT pin is connected to one end of a capacitor C43 through a resistor R6, one end of a capacitor C43 connected to the POWER _ EN pin is connected to the pin PIO _21, a connection point of the capacitor C43 and the resistor R15 is connected to a control end of a switch Q1, the VBAT pin is connected to an input end of the switch Q1, and an output end of the switch Q1 is connected to the SYS _ CNTRL pin. In fig. 2, the 1# position is a terminal of the capacitor C43 for connecting the POWER _ EN pin, the 2# position is a pin PIO _21, the 3# position is a connection point of the capacitor C43 and the resistor R15, and the 4# position is a pin SYS _ CNTRL.
In one embodiment, the automatic switching circuit further includes a first diode, corresponding to diode D8 in fig. 2, diode D8 is disposed on the connection line between pin PIO _21 and capacitor C43, the anode of diode D8 is connected to pin PIO _21, and the cathode of diode D8 is connected to capacitor C43. The diode D8 has an isolation function, and when the 1# position voltage is higher than the 2# position voltage during normal operation, the 2# position will also become low according to the characteristics of the diode D9 when the 1# position becomes low. Of course, the diode D8 is provided as an optimized embodiment, and as another embodiment, the diode D8 may not be provided.
In one embodiment, the automatic switching circuit further comprises a second diode corresponding to the diode D9 in fig. 2, the anode of the diode D9 is grounded, and the cathode of the diode D9 is connected to the connection point of the capacitor C43 and the resistor R15. The diode D9 is provided to form a discharge circuit with the capacitor C43, so as to accelerate the 1# position voltage to low level. Of course, as another embodiment, if the discharge speed of the capacitor C43 still meets the requirement without the diode D9, the diode D9 may not be provided.
In one embodiment, the automatic switching circuit further comprises a first voltage regulator, corresponding to voltage regulator D4 in fig. 2, and the POWER _ EN pin is grounded through a voltage regulator D4. The voltage regulator tube D4 can perform the function of voltage regulation, but it goes without saying that the voltage regulator tube D4 may be provided as another embodiment.
In one embodiment, the automatic switching circuit further comprises a second capacitor, corresponding to the capacitor C19 in fig. 2, and the POWER _ EN pin is grounded through the capacitor C19. The capacitor C19 can function as a filter, but the capacitor C19 may not be provided as an alternative embodiment.
One specific parameter of the relevant component in fig. 2 is given below, such as: the electric parameter of the capacitor C43 is 2.2uF/16V, the electric parameter of the resistor R15 is 10M omega, the electric parameter of the resistor R6 is 560K omega, the models of the diodes D8 and D9 are BR521G-30, the model of the switch tube Q1 is CJ1012, and the model of the voltage regulator tube D4 is ESD9B 5. Of course, the parameters of each component can be set specifically according to actual conditions. In addition, fig. 2 also relates to other parts, such as VBUS pin, GND pin, 1V8_ SMPS pin and components associated with these pins (i.e. a voltage regulator tube D3 and a resistor R5), and since these parts belong to other components of the bluetooth headset and are not related to the automatic switching circuit, the details are not repeated here.
The POWER _ EN pin is used as a detection end for putting in or taking out the charging box of the Bluetooth headset, and the POWER _ EN pin is at a high level when the Bluetooth headset works normally. Before the bluetooth headset is placed in the charging box, the capacitor C43 is fully charged. After the bluetooth headset is placed in the charging box, the POWER _ EN pin is connected with the grounding end of the charging box, the POWER _ EN pin is grounded and becomes low level, and the 1# position voltage, namely the voltage of one end of the capacitor C43 used for connecting the POWER _ EN pin, can be slowly reduced, so that the reduction speed of the 1# position voltage is accelerated under the action of the diode D9, and the voltage becomes low level. When the 1# position voltage is greater than the 2# position voltage in normal operation, when the 1# position voltage becomes a low level, according to the characteristic of the diode D9, the 2# position also becomes a low level at the same time, that is, the PIO _21 pin outputs a low level, the controller controls automatic shutdown according to the low level, for example, when the GPIO port of the controller detects that the IO _21 pin outputs a low level, the shutdown is automatically controlled. When the bluetooth earphone is taken out of the charging box, the POWER _ EN pin is suspended, the 1# position voltage becomes high level due to the action of a positive POWER supply of the VBAT pin, the capacitor C43 and the resistor R15 form an RC charging circuit, the capacitor C43 is charged, the 3# position voltage, namely, the voltage at the connection point of the capacitor C43 and the resistor R15 gradually rises, when the voltage rises to a certain value, the switching tube Q1 is turned on, the VBAT pin is connected with the SYS _ CNTRL pin, so that the 4# position voltage is equal to the VBAT pin level (the capacitance value of the capacitor C43 and the resistance value of the resistor R15 can be adjusted according to actual needs, and further the on-off time of the switching tube Q1 is controlled), the SYS _ CNTRL pin outputs high level, the high level is output to the controller, and the controller controls the bluetooth earphone to be automatically turned on under the action of the high level.
In the above, the controller in the bluetooth headset is used to implement automatic on/off control, and as another embodiment, the pin _21 and the SYS _ CNTRL may also be output and connected to a specific control circuit, and the control circuit controls the bluetooth headset to be turned on/off according to the output level signals of the pin _21 and the SYS _ CNTRL.
Therefore, the automatic switching circuit is not limited to whether the charging box is charged or not, and can realize that whether the charging box is charged or not: the Bluetooth headset is placed into the charging box to be automatically turned off, and is taken out from the charging box to be automatically turned on. The user need not to care about whether the box that charges has the electricity, only needs to operate bluetooth headset according to normal custom, just can realize bluetooth headset's start or shutdown, greatly strengthens user experience.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An automatic power-on and power-off circuit applied to a Bluetooth headset, comprising:
a power supply enabling port connected with the grounding end of the charging box when the charging box is put in;
a power-off control signal output port for controlling the power-off of the Bluetooth headset when the power-off control signal is accessed;
a power-on control signal output port for controlling the power-on of the Bluetooth headset when the power-on control signal is accessed;
a positive power supply input port for connecting a positive power supply;
a first capacitor;
a pull-down module;
a pull-up module; and
an electronic switch module;
the power supply enabling port is connected with one end of the first capacitor, the other end of the first capacitor is connected with one end of the pull-down module, the other end of the pull-down module is grounded, the positive power supply input port is connected with one end of the first capacitor through the pull-up module, the one end of the power supply enabling port is connected with the first capacitor, the power-off control signal output port is connected with one end of the power supply enabling port, the first capacitor is connected with the connection point of the pull-down module, the control end of the switch tube is connected with the positive power supply input port, the input end of the electronic switch module is connected with the output end of the electronic switch module, and the power-on control signal output port is connected with the output end of.
2. The automatic on-off circuit of claim 1, further comprising a first diode disposed on a connection line between the shutdown control signal output port and the first capacitor, wherein an anode of the first diode is connected to the shutdown control signal output port and a cathode of the first diode is connected to the first capacitor.
3. The auto-on-off circuit of claim 1, further comprising a second diode, an anode of the second diode being coupled to ground, a cathode of the second diode being coupled to a junction of the first capacitor and the pull-down module.
4. The automatic on-off circuit according to any one of claims 1 to 3, further comprising a first voltage regulator tube, wherein the power enable port is grounded through the first voltage regulator tube.
5. The automatic switching circuit according to any one of claims 1 to 3, further comprising a second capacitor, wherein the power enable port is grounded through the second capacitor.
6. The auto-on/off circuit of any one of claims 1-3, wherein the pull-down module is a first resistor.
7. The auto-on/off circuit of any one of claims 1-3, wherein the pull-up module is a second resistor.
8. The auto-on/off circuit according to any one of claims 1 to 3, wherein the power-off control signal is a low level signal and the power-on control signal is a high level signal.
9. The automatic switching circuit according to any one of claims 1 to 3, wherein the electronic switching module is a triode.
10. A bluetooth headset, comprising:
a Bluetooth earphone body; and
the automatic on-off circuit of any one of claims 1-9 disposed on the bluetooth headset body.
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| CN201910648962.0A CN111800709A (en) | 2019-07-18 | 2019-07-18 | Automatic power on/off circuit and bluetooth headset |
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| CN201910648962.0A CN111800709A (en) | 2019-07-18 | 2019-07-18 | Automatic power on/off circuit and bluetooth headset |
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Application publication date: 20201020 |