CN219555126U - Earphone reset circuit and earphone system - Google Patents
Earphone reset circuit and earphone system Download PDFInfo
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- CN219555126U CN219555126U CN202320282600.6U CN202320282600U CN219555126U CN 219555126 U CN219555126 U CN 219555126U CN 202320282600 U CN202320282600 U CN 202320282600U CN 219555126 U CN219555126 U CN 219555126U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses an earphone reset circuit and an earphone system, wherein the earphone reset circuit comprises: a charging contact; a charge management chip; a control chip; the first input end of the voltage comparator is connected with the charging contact, the second input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the reset pin of the control chip; the switch control circuit comprises a voltage stabilizing diode, a first switch tube and a second switch tube; the cathode of the voltage stabilizing diode is connected with the charging contact through a first resistor and is connected with the control end of the first switching tube; one end of a switching path of the first switching tube is connected with the charging contact, and the other end of the switching path of the first switching tube is grounded through a second resistor and is connected with a control end of the second switching tube; one end of a switching path of the second switching tube is connected with the charging contact, and the other end of the switching path of the second switching tube is grounded through a third resistor and is connected with a power input pin of the charging management chip. According to the earphone reset circuit and the earphone system, the charging management chip is prevented from being burnt, and the safety of the whole circuit is improved.
Description
Technical Field
The utility model belongs to the technical field of circuits, and particularly relates to an earphone reset circuit and an earphone system.
Background
Consumer electronic products such as TWS Bluetooth headphones and head-mounted Bluetooth headphones in the market at present tend to be low in cost, small in size, simple in design and the like. In order to reduce the cost, the number of the TWS earphone and the charging box is reduced to two charging contacts, one contact realizes time sharing multiplexing of power supply and communication, and the other contact is GND.
Under the dead halt condition of the TWS earphone, the reset key is not arranged on the earphone, so that reset restarting cannot be realized, and the earphone can be reset only through the charging box. The communication schemes of the earphone and the charging box comprise a carrier communication scheme, a UART communication scheme and the like, and no matter which communication scheme is used, the earphone is difficult to be directly controlled to reset.
The scheme in the market at present adopts through earphone charging contact to receive different voltage values and distinguishes whether normally charge or the signal that the box reset earphone charges.
When the voltage at the earphone charging contact is 5V, the earphone recognizes as a normal charging state. When the voltage at the earphone charging contact is above 5.5V or below 4.5V, the earphone recognizes as a charging box reset earphone signal. If the earphone charging contact voltage is lower than 4.5V, the earphone charging contact voltage is identified as a reset earphone signal, and erroneous judgment is easy to generate. Because the high level of the communication between the charging box and the earphone is usually 1.8V or 3.3V, the charging box can be identified as a reset signal when the charging box and the earphone normally communicate, and the communication process is restarted, so that the normal use of the earphone is affected. Therefore, the voltage at the charging contact point of the earphone is more reliable than 5.5V, and the normal communication between the charging box and the earphone is not interfered. However, a higher charging voltage is input to the headset charging management chip, and the maximum input voltage of the headset charging management chip may be exceeded, and this high voltage pulse may damage the charging management chip.
Therefore, there is an urgent need for a reset circuit that can recognize the reset signal and also ensure the safety of the charge management chip.
Disclosure of Invention
The utility model provides an earphone reset circuit, which solves the technical problem that a charging management chip is easy to burn.
In order to solve the technical problems, the utility model is realized by adopting the following technical scheme:
a headset reset circuit, comprising:
a charging contact for connection with a contact of a charging cartridge;
a charge management chip having a power input pin;
a control chip having a reset pin;
the first input end of the voltage comparator is connected with the charging contact, the second input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the reset pin of the control chip;
the switch control circuit comprises a voltage stabilizing diode, a first switch tube and a second switch tube; the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the charging contact through a first resistor; the cathode of the voltage stabilizing diode is connected with the control end of the first switching tube, one end of a switching path of the first switching tube is connected with the charging contact, the other end of the switching path of the first switching tube is grounded through a second resistor, the other end of the switching path of the first switching tube is connected with the control end of the second switching tube, one end of the switching path of the second switching tube is connected with the charging contact, the other end of the switching path of the second switching tube is grounded through a third resistor, and the other end of the switching path of the second switching tube is connected with a power input pin of the charging management chip.
In some embodiments of the present utility model, the first switching tube is a PMOS tube; the cathode of the voltage stabilizing diode is connected with the grid electrode of the first switching tube, the source electrode of the first switching tube is connected with the charging contact, the drain electrode of the first switching tube is grounded through a second resistor, and the drain electrode of the first switching tube is connected with the control end of the second switching tube.
In some embodiments of the present utility model, the first switching transistor is a PNP transistor; the cathode of the voltage stabilizing diode is connected with the base electrode of the first switching tube, the emitting electrode of the first switching tube is connected with the charging contact, the collecting electrode of the first switching tube is grounded through a second resistor, and the collecting electrode of the first switching tube is connected with the control end of the second switching tube.
In some embodiments of the present utility model, the second switching tube is a PMOS tube; the other end of the switching path of the first switching tube is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the charging contact, the drain electrode of the second switching tube is grounded through a third resistor, and the drain electrode of the second switching tube is connected with the power input pin of the charging management chip.
In some embodiments of the present utility model, the second switching transistor is a PNP transistor; the other end of the switching path of the first switching tube is connected with the base electrode of the second switching tube, the emitter electrode of the second switching tube is connected with the charging contact, the collector electrode of the second switching tube is grounded through a third resistor, and the collector electrode of the second switching tube is connected with the power input pin of the charging management chip.
In some embodiments of the present utility model, an inverting input terminal of the voltage comparator is connected to the charging contact, and a non-inverting input terminal of the voltage comparator is connected to the reference voltage.
Based on the above-mentioned earphone reset circuit, the present utility model provides an earphone system, comprising:
the charging box comprises a reset key, a main control chip, a voltage conversion module, a first contact and a second contact; the reset key sends a reset signal to the main control chip when being pressed down, and the main control chip changes the voltage output by the output end of the voltage conversion module when receiving the reset signal; the output end of the voltage conversion module is respectively connected with the first contact and the second contact;
the left earphone and the right earphone both comprise the earphone reset circuit; the charging contact of the earphone reset circuit of the left earphone is used for being connected with the first contact of the charging box, and the charging contact of the earphone reset circuit of the right earphone is used for being connected with the second contact of the charging box.
In some embodiments of the present utility model, the reset key includes a first reset key and a second reset key;
the output end of the voltage conversion module comprises a first output end and a second output end; the first output end is connected with the first contact, and the second output end is connected with the second contact;
the main control chip is connected with the first reset key, and changes the voltage output by the first output end of the voltage conversion module when the first reset key is detected to be pressed;
the main control chip is connected with the second reset key, and changes the voltage output by the second output end of the voltage conversion module when the second reset key is detected to be pressed.
In some embodiments of the present utility model, a bottom of the housing of the charging box has a groove, and the reset key is disposed in the groove.
In some embodiments of the present utility model, the bottom of the housing of the charging box has two grooves arranged left and right, the first reset key is disposed in the groove on the left side, and the second reset key is disposed in the groove on the right side.
Compared with the prior art, the utility model has the advantages and positive effects that: according to the earphone resetting circuit and the earphone system, the switch control circuit and the voltage comparator are designed, when the voltage at the charging contact is high, the voltage comparator outputs an effective resetting signal, so that the earphone is reset; the switch control circuit outputs low level, so that the charging management chip is prevented from being burnt, and the safety of the whole circuit is improved; moreover, the circuit is simple to build, low in cost and convenient to realize.
Other features and advantages of the present utility model will become more apparent from the following detailed description of embodiments of the present utility model, which is to be read in connection with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a functional block diagram of one embodiment of a headset reset circuit in accordance with the present utility model;
FIG. 2 is a functional block diagram of one embodiment of the switch control circuit of FIG. 1;
FIG. 3 is a functional block diagram of yet another embodiment of the switch control circuit of FIG. 1;
fig. 4 is a functional block diagram of one embodiment of the proposed headset system.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Embodiment 1,
The earphone reset circuit of the present embodiment includes a charging contact C, a charging management chip, a control chip, a voltage comparator, a switch control circuit, and the like, as shown in fig. 1.
And a charging contact C for connection with a contact of the charging cartridge. When the earphone is placed in the charging box, the charging contact C of the earphone is connected with the contact of the charging box, and the charging box sends a charging signal or a reset signal to the charging contact C of the earphone through the contact of the charging box.
And the charging management chip is provided with a power input pin and a power output pin. The power input pin is connected with the switch control circuit, and the power output pin is connected with the earphone battery to charge the earphone battery.
And the control chip controls the operation of the whole earphone. The control chip is provided with a RESET pin RESET, and when a RESET signal is received, the RESET of the whole earphone is controlled.
The first input end of the voltage comparator is connected with the charging contact C, the second input end of the voltage comparator is connected with the reference voltage Vref, and the output end of the voltage comparator is connected with the RESET pin RESET of the control chip and is used for outputting a RESET signal to the control chip.
The switch control circuit comprises a zener diode D1, a first switching tube Q1, a second switching tube Q2, a first resistor R1, a second resistor R2 and a third resistor R3, and is shown in FIG. 2. The anode of the zener diode D1 is grounded, the cathode of the zener diode D1 is connected with the charging contact C through the first resistor R1, namely, the cathode of the zener diode D1 is connected with one end of the first resistor R1, and the other end of the first resistor R1 is connected with the charging contact C; the cathode of the voltage stabilizing diode D1 is connected with the control end of the first switching tube Q1, one end of a switching path of the first switching tube Q1 is connected with the charging contact C, the other end of the switching path of the first switching tube Q1 is grounded through the second resistor R2, the other end of the switching path of the first switching tube Q1 is connected with the control end of the second switching tube Q2, one end of the switching path of the second switching tube Q2 is connected with the charging contact C, the other end of the switching path of the second switching tube Q2 is grounded through the third resistor R3, and the other end of the switching path of the second switching tube Q2 is connected with a power input pin of the charging management chip.
When the earphone is placed in the charging box, the charging contact C of the earphone is connected with the contact of the charging box, so that the charging box charges and resets the earphone and communicates with the earphone.
When the earphone is placed in the charging box, the charging contact C of the earphone is in contact with the contact of the charging box, and the contact of the charging box sends a voltage signal to the charging contact C of the earphone.
When the charging box is required to charge the earphone normally, the contact of the charging box outputs a charging signal (charging voltage V1), and the voltage at the charging contact C of the earphone is the charging voltage V1;
when the earphone is required to be reset by the charging box, the contact of the charging box outputs a reset signal (reset voltage V2) when the charging box sends a reset signal to the earphone, and the voltage at the charging contact C of the earphone is the reset voltage V2; the reset voltage V2 is greater than the charging voltage V1.
The clamp voltage of the zener diode D1 is denoted Vzener, the reference voltage Vref is supplied by the reference power supply,
the charging voltage V1 is less than Vzener is less than the reference voltage Vref is less than the reset voltage V2.
The voltage difference between the reset voltage V2 and the clamp voltage Vzener satisfies the conducting condition of the first switching tube Q1, so that the first switching tube Q1 is conducted.
For example, the charging voltage v1=5v, the reset voltage v2=6v, and 5.5 v+.vzener < 6v, such as the clamping voltage vzener=5.5V, and the reference voltage vref=5.9V.
When the voltage at the charging contact C is the charging voltage V1, the output end of the voltage comparator outputs an invalid reset signal because V1 is smaller than the reference voltage Vref;
when the voltage at the charging contact C is the reset voltage V2, the output end of the voltage comparator outputs a valid reset signal because V2 is larger than the reference voltage Vref; after the reset pin of the control chip receives the effective reset signal, the control chip controls the earphone to reset.
When the voltage at the charging contact C is the charging voltage V1, the zener diode D1 is not broken down, the voltage at the control end of the first switching tube Q1 is V1, the voltage at one end of the switching path of the first switching tube Q1 is V1, the first switching tube Q1 is turned off, the voltage at the other end of the switching path of the Q1 is 0, the voltage at the control end of the second switching tube Q2 is 0, the voltage at one end of the switching path of the Q2 is V1, the second switching tube Q2 is turned on, and the other end of the switching path of the second switching tube Q2 outputs the charging signal (charging voltage V1) to the charging management chip, so that the charging management chip can be normally supplied with electric energy.
When the voltage at the charging contact C is the reset voltage V2, the zener diode D1 breaks down, the zener diode D1 clamps the voltage at the voltage Vzener, the voltage at the control terminal of the first switching tube Q1 is Vzener, the voltage at one end of the switching path of the Q1 is V2, the voltage difference between V2 and Vzener makes the first switching tube Q1 conductive, the voltage at the other end of the switching path of the Q1 is V2, the voltage at the control terminal of the second switching tube Q2 is V2, the voltage at one end of the switching path of the Q2 is V2, the second switching tube Q2 is turned off, and the voltage at the other end of the switching path of the second switching tube Q2 is 0, so the reset voltage V2 is not transmitted to the charging management chip, thereby protecting the charging management chip.
Therefore, when the voltage at the charging contact C is the charging voltage V1, the output end of the voltage comparator outputs an invalid reset signal, and the voltage at the charging contact C is transmitted to the charging management chip through the second switching tube Q2, so that the charging management chip can be normally supplied with electric energy;
when the voltage at the charging contact C is the reset voltage V2, the output end of the voltage comparator outputs an effective reset signal, and the earphone is reset; the second switching tube Q2 is turned off to prevent high voltage at the charging contact C from being transmitted to the charging management chip, so that the safety of the charging management chip is protected, and the charging management chip is prevented from being burnt.
According to the earphone resetting circuit, the switch control circuit and the voltage comparator are designed, when the voltage at the charging contact C is high, the voltage comparator outputs an effective resetting signal, so that the earphone is reset; the switch control circuit outputs low level to prevent the charging management chip from being burnt; moreover, the circuit is simple to build, low in cost and convenient to realize.
In some embodiments of the present utility model, in order to ensure reliability and stability of reset and prevent erroneous reset, an inverting input terminal of the voltage comparator is connected to the charging contact C, and a non-inverting input terminal of the voltage comparator is connected to the reference voltage Vref.
When the voltage at the charging contact C is the charging voltage V1, since V1 < the reference voltage Vref, the output terminal of the voltage comparator outputs a high level (an invalid reset signal);
when the voltage at the charging contact C is the reset voltage V2, the output of the voltage comparator outputs a low level (valid reset signal) because V2 > the reference voltage Vref.
That is, the RESET signal is active low, and when the RESET pin RESET of the control chip receives the low level, the control chip controls the earphone to RESET.
The first switching tube Q1 and the second switching tube Q2 are low-conduction voltage drop switching tubes.
In some embodiments of the present utility model, the first switching tube Q1 is a PMOS tube; the cathode of the voltage stabilizing diode D1 is connected with the grid electrode of the first switching tube Q1, the source electrode of the first switching tube Q1 is connected with the charging contact C, the drain electrode of the first switching tube Q1 is grounded through the second resistor R2, and the drain electrode of the first switching tube Q1 is connected with the control end of the second switching tube Q2.
When the voltage at the charging contact C is the charging voltage V1, the voltage at the charging contact C is less than the breakdown voltage of the zener diode D1, the gate voltage VG1 and the source voltage VS1 of the first switching tube Q1 are equal, both are equal to V1, and the first switching tube Q1 is turned off.
When the voltage at the charging contact C is the reset voltage V2, the voltage at the charging contact C > the breakdown voltage of the zener diode D1, the zener diode D1 is broken down, the voltage at the cathode of the zener diode D1 is the clamping voltage Vzener, i.e., the gate voltage vg1=vzener of the first switching tube Q1, the source voltage vs1=the voltage V2 at the charging contact C; the voltage difference between the voltage at the charging contact C and the clamping voltage Vzener reaches the conduction voltage drop of the first switching tube Q1, and the first switching tube Q1 is turned on.
Through designing first switch tube Q1 as the PMOS tube, both convenient control break-make, and with low costs, stable performance.
In still other embodiments of the present utility model, the first switching transistor Q1 is a PNP transistor; the cathode of the voltage stabilizing diode D1 is connected with the base electrode of the first switching tube Q1, the emitter electrode of the first switching tube Q1 is connected with the charging contact C, the collector electrode of the first switching tube Q1 is grounded through the second resistor R2, and the collector electrode of the first switching tube Q1 is connected with the control end of the second switching tube Q2.
When the voltage at the charging contact C is the charging voltage V1, the voltage at the charging contact C is less than the breakdown voltage of the zener diode D1, the base voltage Vb1 and the emitter voltage Ve1 of the first switching tube Q1 are equal, both are equal to V1, and the first switching tube Q1 is turned off.
When the voltage at the charging contact C is the reset voltage V2, the voltage at the charging contact C > the breakdown voltage of the zener diode D1, the zener diode D1 is broken down, the voltage at the cathode of the zener diode D1 is the clamp voltage Vzener, i.e., the base voltage vb1=vzener of the first switching tube Q1, the emitter voltage ve1=the voltage V2 at the charging contact C; the voltage difference between the voltage at the charging contact C and the clamping voltage Vzener reaches the conduction voltage drop of the first switching tube Q1, and the first switching tube Q1 is turned on.
Through designing first switch tube Q1 as PNP triode, both convenient control break-make, and with low costs, stable performance.
In some embodiments of the present utility model, the second switching tube Q2 is a PMOS tube; the other end of the switching path of the first switching tube Q1 is connected with the grid electrode of the second switching tube Q2, the source electrode of the second switching tube Q2 is connected with the charging contact C, the drain electrode of the second switching tube Q2 is grounded through the third resistor R3, and the drain electrode of the second switching tube Q2 is connected with the power input pin of the charging management chip.
When the voltage at the charging contact C is the charging voltage V1, the first switching tube Q1 is turned off, the gate voltage vg2=0 of the second switching tube Q2, the source voltage vs2=v1, and the second switching tube Q2 is turned on.
When the voltage at the charging contact C is the charging voltage V2, the first switching tube Q1 is turned on, the gate voltage vg2=v2 of the second switching tube Q2, the source voltage vs2=v2, and the second switching tube Q2 is turned off.
Through designing the second switch tube Q2 as the PMOS tube, both convenient control break-make, and with low costs, stable performance.
In still other embodiments of the present utility model, the second switching transistor Q2 is a PNP transistor; the other end of the switching path of the first switching tube Q1 is connected with the base electrode of the second switching tube Q2, the emitter electrode of the second switching tube Q2 is connected with the charging contact C, the collector electrode of the second switching tube Q2 is grounded through the third resistor R3, and the collector electrode of the second switching tube Q2 is connected with the power input pin of the charging management chip.
When the voltage at the charging contact C is the charging voltage V1, the first switching tube Q1 is turned off, the base voltage vb2=0 of the second switching tube Q2, the emitter voltage ve2=v1, and the second switching tube Q2 is turned on.
When the voltage at the charging contact C is the charging voltage V2, the first switching tube Q1 is turned on, the base voltage vg2=v2 of the second switching tube Q2, the emitter voltage ve2=v2, and the second switching tube Q2 is turned off.
Through designing the second switch tube Q2 as PNP triode, both convenient control break-make, and with low costs, stable performance.
In still other embodiments of the present utility model, the first switching tube Q1 and the second switching tube Q2 are PMOS tubes, as shown in fig. 3; the cathode of the voltage stabilizing diode D1 is connected with the grid electrode of the first switching tube Q1, the source electrode of the first switching tube Q1 is connected with the charging contact C, the drain electrode of the first switching tube Q1 is grounded through the second resistor R2, the drain electrode of the first switching tube Q1 is connected with the grid electrode of the second switching tube Q2, the source electrode of the second switching tube Q2 is connected with the charging contact C, the drain electrode of the second switching tube Q2 is grounded through the third resistor R3, and the drain electrode of the second switching tube Q2 is connected with the power input pin of the charging management chip.
When the voltage at the charging contact C is the charging voltage V1, the voltage at the charging contact C is less than the breakdown voltage of the zener diode D1, the gate voltage VG1 and the source voltage VS1 of the first switching tube Q1 are equal to V1, the first switching tube Q1 is turned off, and the drain voltage VD1 of Q1 is almost 0; the gate voltage vg2=0 of the second switching transistor Q2, the source voltage vs2=v1 of Q2, the second switching transistor Q2 is turned on, and the drain voltage vd2=v1 of Q2. The drain voltage VD2 is input to the charge management chip to realize charging of the earphone battery.
When the voltage at the charging contact C is the reset voltage V2, the voltage at the charging contact C > the breakdown voltage of the zener diode D1, the zener diode D1 is broken down, the voltage at the cathode of the zener diode D1 is the clamping voltage Vzener, i.e., the gate voltage vg1=vzener of the first switching tube Q1, the source voltage vs1=the voltage V2 at the charging contact C; the voltage difference between the voltage at the charging contact C and the clamping voltage Vzener reaches the conduction voltage drop of the first switching tube Q1, the first switching tube Q1 is conducted, and the drain voltage of the first switching tube Q1 is Vd1=V2; the gate voltage vg2=v2 of the second switching transistor Q2, the source voltage vs2=v2, the second switching transistor Q2 is turned off, and the drain voltage VD2 of Q2 is 0, so the reset voltage V2 is not input to the charge management chip, and damage to the charge management chip is not caused.
In still other embodiments of the present utility model, the first switching transistor Q1 and the second switching transistor Q2 are PNP transistors; the cathode of the voltage stabilizing diode D1 is connected with the base electrode of the first switching tube Q1, the emitter of the first switching tube Q1 is connected with the charging contact C, the collector of the first switching tube Q1 is grounded through the second resistor R2, the collector of the first switching tube Q1 is connected with the base electrode of the second switching tube Q2, the emitter of the second switching tube Q2 is connected with the charging contact C, the collector of the second switching tube Q3 is grounded through the third resistor R3, and the collector of the second switching tube Q2 is connected with the power input pin of the charging management chip.
When the voltage at the charging contact C is the charging voltage V1, the voltage at the charging contact C is less than the breakdown voltage of the zener diode D1, the base voltage Vb1 and the emitter voltage Ve1 of the first switching tube Q1 are equal, both are equal to V1, and the first switching tube Q1 is turned off; the base voltage vb2=0, the emitter voltage ve2=v1 of the second switching transistor Q2, and the second switching transistor Q2 is turned on.
When the voltage at the charging contact C is the reset voltage V2, the voltage at the charging contact C > the breakdown voltage of the zener diode D1, the zener diode D1 is broken down, the voltage at the cathode of the zener diode D1 is the clamp voltage Vzener, i.e., the base voltage vb1=vzener of the first switching tube Q1, the emitter voltage ve1=the voltage V2 at the charging contact C; the voltage difference between the voltage at the charging contact C and the clamping voltage Vzener reaches the conduction voltage drop of the first switching tube Q1, and the first switching tube Q1 is conducted; the base voltage vg2=v2, the emitter voltage ve2=v2 of the second switching transistor Q2, and the second switching transistor Q2 is turned off.
Embodiment II,
Based on the design of the earphone resetting circuit, the second embodiment provides an earphone system, which includes a charging box, a left earphone and a right earphone, as shown in fig. 4.
The charging box comprises a reset key, a main control chip, a voltage conversion module, a first contact VPOGO_L and a second contact VPOGO_R; the reset key is electrically connected with the main control chip, and transmits a reset signal to the main control chip when the reset key is pressed down, and the main control chip changes the voltage output by the output end of the voltage conversion module when receiving the reset signal; the output end of the voltage conversion module is respectively connected with the first contact VPOGO_L and the second contact VPOGO_R.
A left earphone comprising the earphone resetting circuit of embodiment one; the charging contact of the earphone reset circuit of the left earphone is used for being connected with the first contact VPOGO_L of the charging box.
A right earphone comprising the earphone resetting circuit of embodiment one; the charging contact of the earphone reset circuit of the right earphone is used for being connected with the second contact VPOGO_R of the charging box.
When the left earphone is placed in the charging box, a charging contact of an earphone reset circuit of the left earphone is connected with a first contact VPOGO_L of the charging box.
When the right earphone is placed in the charging box, a charging contact of an earphone reset circuit of the right earphone is connected with a second contact VPOGO_R of the charging box.
The main control chip of the charging box controls the voltage output by the output end of the voltage conversion module.
When the reset key is not pressed, the main control chip controls the output end of the voltage conversion module to output charging voltage V1, and then the charging voltage V1 is transmitted to the charging contact of the left earphone and the charging contact of the right earphone respectively through the first contact VPOGO_L and the second contact VPOGO_R, and then the charging voltage V1 is input to the charging management chip through the switch control circuit of each earphone, and the charging management chip charges the earphone battery, so that the charging of the left earphone and the right earphone is realized. But the earphone is not reset and the reset function is not realized.
When the reset key is pressed down, a reset signal is generated and transmitted to the main control chip, the main control chip controls the output end of the voltage conversion module to output reset voltage V2, V2 is more than V1, and then the reset voltage is respectively transmitted to the left earphone and the right earphone through the first contact VPOGO_L and the second contact VPOGO_R to reset the left earphone and the right earphone respectively; moreover, the reset voltage V2 is not input to the charge management chip due to the switch control circuit, preventing the charge management chip from being burned.
Therefore, in the normal working state, after the charging box detects that the earphone is in the box, the main control chip controls the output end of the voltage conversion module to output the charging voltage V1, for example, v1=5v, so as to charge the left earphone and the right earphone, but the earphone cannot be reset.
After the earphone is halted, the reset key is pressed for a long time to generate a reset signal, the main control chip controls the output end of the voltage conversion module to output a reset voltage V2, if V2 = 6V, the reset voltage is obviously higher than the charging voltage, and erroneous judgment is avoided.
A high voltage reset signal of 6V enters the headset through the contacts. Because the charge management chip can not bear the 6V high voltage pulse, the output voltage of the switch control circuit is 0V at the moment, and the charge management chip is prevented from being damaged by the high voltage. The high-voltage reset signal of 6V can activate the reset pin of the control chip to finish the reset of the earphone by the charging box. In this state, the earphone can be reset, and the charging management chip of the earphone is not damaged by high voltage.
By respectively designing the earphone reset circuits in the left earphone and the right earphone of the earphone system, when resetting the earphone, the reset voltage cannot be input into the charging management unit, so that the charging management unit is prevented from being burnt.
In some embodiments of the utility model, the bottom of the shell of the charging box is provided with a groove, the opening of the groove faces downwards, and the reset key is arranged in the groove, so that the charging box is convenient for a user to press and can avoid false touch.
In some embodiments of the present utility model, in order to control the resetting of the left earphone and the right earphone respectively, the resetting keys include a first resetting key and a second resetting key, which are used for resetting the left earphone and the right earphone respectively.
The output end of the voltage conversion module comprises a first output end and a second output end; the first output end is connected with the first contact, and the second output end is connected with the second contact.
The main control chip is connected with the first reset key, and changes the voltage output by the first output end of the voltage conversion module when the first reset key is detected to be pressed.
The main control chip is connected with the second reset key, and when the second reset key is detected to be pressed, the voltage output by the second output end of the voltage conversion module is changed.
When the first reset key is not pressed, the main control chip controls the first output end of the voltage conversion module to output charging voltage V1, and then the charging voltage V1 is transmitted to the left earphone through the first contact VPOGO_L to charge the left earphone.
When the first reset key is pressed, the main control chip controls the first output end of the voltage conversion module to output reset voltage V2, V2 is larger than V1, and then the reset voltage V2 is transmitted to the left earphone through the first contact VPOGO_L to reset the left earphone.
When the second reset key is not pressed, the main control chip controls the second output end of the voltage conversion module to output charging voltage V1, and then the charging voltage V1 is transmitted to the right earphone through the second contact VPOGO_R to charge the right earphone.
When the second reset key is pressed, the main control chip controls the second output end of the voltage conversion module to output reset voltage V2, V2 is larger than V1, and then the reset voltage V2 is transmitted to the right earphone through the second contact VPOGO_R to reset the right earphone.
In some embodiments of the present utility model, the bottom of the casing of the charging box is provided with two grooves arranged left and right, openings of the two grooves are downward, the first reset key is arranged in the groove on the left side, and the second reset key is arranged in the groove on the right side, so that the user can reset the left earphone and the right earphone respectively conveniently, and false touch is avoided.
In the earphone system of this embodiment, a high-voltage pulse (reset voltage V2, e.g., 6V) higher than the normal charging voltage V1 (e.g., 5V) is output through the charging box, so that the reset pin of the control chip of the earphone receives an effective reset signal, triggers a reset function, controls the earphone to reset, and through the switch control circuit of the earphone, the high-voltage pulse is not input into the charging management chip, and thus the earphone function is not damaged. When the charging box outputs normal charging voltage V1 (such as 5V), the earphone resetting function is not triggered by mistake, and the normal charging function can be realized.
The earphone system of this embodiment is with low costs, mainly is applied to TWS earphone, also is applicable to other types earphone that have the box that charges, conveniently resets for the earphone through the box that charges. But also to all products requiring a reset function.
It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that other variations, modifications, additions and substitutions are possible, without departing from the scope of the utility model as disclosed in the accompanying claims.
Claims (10)
1. An earphone reset circuit which is characterized in that: comprising the following steps:
a charging contact for connection with a contact of a charging cartridge;
a charge management chip having a power input pin;
a control chip having a reset pin;
the first input end of the voltage comparator is connected with the charging contact, the second input end of the voltage comparator is connected with the reference voltage, and the output end of the voltage comparator is connected with the reset pin of the control chip;
the switch control circuit comprises a voltage stabilizing diode, a first switch tube and a second switch tube; the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the charging contact through a first resistor; the cathode of the voltage stabilizing diode is connected with the control end of the first switching tube, one end of a switching path of the first switching tube is connected with the charging contact, the other end of the switching path of the first switching tube is grounded through a second resistor, the other end of the switching path of the first switching tube is connected with the control end of the second switching tube, one end of the switching path of the second switching tube is connected with the charging contact, the other end of the switching path of the second switching tube is grounded through a third resistor, and the other end of the switching path of the second switching tube is connected with a power input pin of the charging management chip.
2. The earphone reset circuit of claim 1, wherein: the first switch tube is a PMOS tube; the cathode of the voltage stabilizing diode is connected with the grid electrode of the first switching tube, the source electrode of the first switching tube is connected with the charging contact, the drain electrode of the first switching tube is grounded through a second resistor, and the drain electrode of the first switching tube is connected with the control end of the second switching tube.
3. The earphone reset circuit of claim 1, wherein: the first switching tube is a PNP triode; the cathode of the voltage stabilizing diode is connected with the base electrode of the first switching tube, the emitting electrode of the first switching tube is connected with the charging contact, the collecting electrode of the first switching tube is grounded through a second resistor, and the collecting electrode of the first switching tube is connected with the control end of the second switching tube.
4. The earphone reset circuit of claim 1, wherein: the second switching tube is a PMOS tube; the other end of the switching path of the first switching tube is connected with the grid electrode of the second switching tube, the source electrode of the second switching tube is connected with the charging contact, the drain electrode of the second switching tube is grounded through a third resistor, and the drain electrode of the second switching tube is connected with the power input pin of the charging management chip.
5. The earphone reset circuit of claim 1, wherein: the second switching tube is a PNP triode, the other end of the switching path of the first switching tube is connected with the base electrode of the second switching tube, the emitting electrode of the second switching tube is connected with the charging contact, the collecting electrode of the second switching tube is grounded through a third resistor, and the collecting electrode of the second switching tube is connected with the power input pin of the charging management chip.
6. The headphone reset circuit according to any one of claims 1 to 5, wherein: the inverting input end of the voltage comparator is connected with the charging contact, and the non-inverting input end of the voltage comparator is connected with the reference voltage.
7. An earphone system, characterized by: comprising the following steps:
the charging box comprises a reset key, a main control chip, a voltage conversion module, a first contact and a second contact; the reset key sends a reset signal to the main control chip when being pressed down, and the main control chip changes the voltage output by the output end of the voltage conversion module when receiving the reset signal; the output end of the voltage conversion module is respectively connected with the first contact and the second contact;
left and right headphones each comprising a headphone reset circuit as claimed in any one of claims 1 to 6; the charging contact of the earphone reset circuit of the left earphone is used for being connected with the first contact of the charging box, and the charging contact of the earphone reset circuit of the right earphone is used for being connected with the second contact of the charging box.
8. The earphone system according to claim 7, wherein:
the reset key comprises a first reset key and a second reset key;
the output end of the voltage conversion module comprises a first output end and a second output end; the first output end is connected with the first contact, and the second output end is connected with the second contact;
the main control chip is connected with the first reset key, and changes the voltage output by the first output end of the voltage conversion module when the first reset key is detected to be pressed;
the main control chip is connected with the second reset key, and changes the voltage output by the second output end of the voltage conversion module when the second reset key is detected to be pressed.
9. The earphone system according to claim 7, wherein: the bottom of the shell of the charging box is provided with a groove, and the reset key is arranged in the groove.
10. The earphone system according to claim 8, wherein: the charging box is characterized in that two grooves are formed in the bottom of the shell of the charging box and are distributed left and right, the first reset key is arranged in the groove on the left side, and the second reset key is arranged in the groove on the right side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320282600.6U CN219555126U (en) | 2023-02-21 | 2023-02-21 | Earphone reset circuit and earphone system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320282600.6U CN219555126U (en) | 2023-02-21 | 2023-02-21 | Earphone reset circuit and earphone system |
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| Publication Number | Publication Date |
|---|---|
| CN219555126U true CN219555126U (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320282600.6U Active CN219555126U (en) | 2023-02-21 | 2023-02-21 | Earphone reset circuit and earphone system |
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| Country | Link |
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| CN (1) | CN219555126U (en) |
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2023
- 2023-02-21 CN CN202320282600.6U patent/CN219555126U/en active Active
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