Indicator light power supply circuit and bluetooth system

Abstract

The utility model relates to the technical field of bluetooth headsets, in particular to an indicator light power supply circuit and a bluetooth system; the utility model comprises a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and a first indicator light; the gate of the MOS tube is connected to the power input terminal, the drain of the MOS tube is connected to the battery input terminal, and the source of the MOS tube is connected to the first indicator light; one end of the pull-down resistor is connected to the gate of the MOS tube, and the other end of the pull-down resistor is grounded; the positive electrode of the protection diode is connected to the power input terminal, and the negative electrode of the protection diode is connected to the first indicator light; an indicator light power supply circuit is designed, comprising a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and the first indicator light, and the gate of the MOS tube is connected to the power input terminal, the drain of the MOS tube is connected to the battery input terminal, and the MOS tube is controlled to switch the power supply path, so that when the headset is charging, the first indicator light is powered by an external power supply, and the power consumption of the bluetooth headset when it is turned off is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bluetooth earphones, in particular to an indicator light power supply circuit and a bluetooth system. Background Art

[0002] In the application of Bluetooth headsets, the positive pole of the LED indicator light is generally powered by the battery. When the headset is charging, the headset is turned off. If the headset is fully charged, the headset will stop charging. However, the LED indicator light will still draw power from the battery and will continue to consume the battery storage power. When the power is lower than a certain voltage limit, it will wake up the 5V charging. This power supply method is prone to the following problems: (1) When the LED indicator light is on, showing that the headset is fully charged, it is very likely that the battery is not fully charged due to the consumption of battery power by the green light; (2) If the headset is not unplugged from the 5V charging head, it will fall into a repeated charge and discharge cycle, affecting the battery life.

[0003] Therefore, it is very important for those skilled in the art to design an indicator light power supply circuit and a Bluetooth system that can reduce the power consumption of the LED indicator light when the Bluetooth headset is turned off. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is to provide an indicator light power supply circuit and a Bluetooth system that can reduce the power consumption of the LED indicator light when the Bluetooth headset is turned off, so as to solve the problem in the prior art that repeated charge and discharge cycles affect the battery life.

[0005] The utility model discloses an indicator light power supply circuit, which is applied to a Bluetooth headset. The scheme is that the circuit comprises a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and a first indicator light; the gate of the MOS tube is connected to the power input terminal, the drain of the MOS tube is connected to the battery input terminal, and the source of the MOS tube is connected to the first indicator light; one end of the pull-down resistor is connected to the gate of the MOS tube, and the other end of the pull-down resistor is grounded; the positive electrode of the protection diode is connected to the power input terminal, and the negative electrode of the protection diode is connected to the first indicator light.

[0006] Optionally, at least one second indicator light is further included, and the second indicator light is connected to the battery input terminal.

[0007] Optionally, a current limiting resistor is further provided between the anode of the protection diode and the power input terminal, so as to adjust the current of the first indicator light and balance the brightness of the first indicator light under different power supply states.

[0008] In order to solve the problems existing in the prior art, the utility model also provides a Bluetooth system, whose solution is that it includes the indicator light power supply device as described above, and also includes a Bluetooth module, a USB interface and a battery, the battery and the USB interface are both connected to the Bluetooth module, the power input end is connected to the USB interface, the battery input end is connected to the battery, and the first indicator light is connected to the Bluetooth module.

[0009] Optionally, the indicator light power supply device further includes at least one second indicator light.

[0010] Optionally, resistors are provided between the first indicator light and the Bluetooth module, and between the second indicator light and the Bluetooth module.

[0011] Optionally, an antenna module is further included, and an output end of the antenna module is connected to the input and output ends of the Bluetooth module.

[0012] Optionally, a microphone module is further included, and an output end of the microphone module is connected to the input and output ends of the Bluetooth module.

[0013] Optionally, a speaker module is further included, and an input end of the speaker module is connected to an input and output end of the Bluetooth module.

[0014] Optionally, a key module is further included, and an output end of the key module is connected to the input and output ends of the Bluetooth module.

[0015] Compared with the prior art, the beneficial effect of the indicator light power supply circuit provided by the embodiment of the utility model is: by designing an indicator light power supply circuit, including a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and a first indicator light, by connecting the gate of the MOS tube to the power input terminal, connecting the drain of the MOS tube to the battery input terminal, and by controlling the MOS tube to switch the power supply path, when the headset is charging, the first indicator light is powered by an external power supply, which can not only effectively reduce the power consumption when the Bluetooth headset is turned off, but also ensure the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments, in which:

[0017] Figure 1 It is a circuit diagram of an indicator light power supply circuit provided by an embodiment of the utility model;

[0018] Figure 2 It is a circuit diagram of an indicator light power supply circuit in the prior art;

[0019] Figure 3 It is a circuit diagram of a Bluetooth system provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0021] like Figure 1 As shown, the utility model provides a specific embodiment of an indicator light power supply circuit.

[0022] An indicator light power supply circuit, which is mainly used in Bluetooth headsets, Figure 1 , the indicator light power supply circuit includes a power input terminal VBUS, a battery input terminal VBAT, a MOS tube Q2, a pull-down resistor R10, a protection diode D8 and a first indicator light D13;

[0023] Among them, the gate G of the MOS tube Q2 is connected to the power input terminal VBUS, the drain D of the MOS tube Q2 is connected to the battery input terminal VBAT, and the source S of the MOS tube Q2 is connected to the first indicator light D13; one end of the pull-down resistor R10 is connected to the gate G of the MOS tube Q2, and the other end of the pull-down resistor R10 is grounded; the positive electrode of the protection diode D8 is connected to the power input terminal VBUS, and the negative electrode of the protection diode D8 is connected to the first indicator light D13.

[0024] Specifically, refer to Figure 1 , the power input terminal VBUS is used to connect to an external power supply, and the battery input terminal VBAT is used to connect to the internal battery of the Bluetooth headset. When the headset is worn and used normally, the power input terminal VBUS is not connected to the external power supply, and the gate G of the MOS tube Q2 is connected to the pull-down resistor R10 and grounded, so that the voltage on the gate G side of the MOS tube Q2 is less than the voltage on the source S side of the MOS tube Q2, and the voltage difference between the gate G of the MOS tube Q2 and the source S of the MOS tube Q2 is greater than the threshold voltage for turning on the MOS tube Q2, the MOS tube Q2 is turned on, and the drain D of the MOS tube Q2 is turned on with the source S of the MOS tube Q2. Since the drain D of the MOS tube Q2 is connected to the battery input terminal VBAT, in this state, the first indicator light D13 is powered by the battery.

[0025] In order to prevent the high level from being transmitted to the gate G side of the MOS tube Q2, that is, to prevent the high level of the battery input terminal VBAT from being transmitted to the power input terminal VBUS, a protection diode D8 is further provided in the indicator light power supply circuit.

[0026] Furthermore, when the Bluetooth headset is charging, an external power supply is connected to the power input terminal VBUS, and the gate G of the MOS tube Q2 is at a high level, so that the voltage on the gate G side of the MOS tube Q2 is greater than the voltage on the source S side of the MOS tube Q2, and the MOS tube Q2 is not turned on. At this time, the voltage of the power input terminal VBUS passes through the protection diode D8 to the first indicator light D13, and the parasitic diode of the MOS tube Q2 prevents the high level of the power input terminal VBUS from being reversed to the battery input terminal VBAT. In this state, the first indicator light D13 is powered by an external power supply.

[0027] Among them, the first indicator light D13 is always on after the Bluetooth headset is fully charged.

[0028] refer to Figure 2 In the prior art, in the application of Bluetooth headsets, the LED display requirements are: during normal wearing and use, not charging, when the power is 80-100%, the green light D10 is always on, when charging the headset, the headset is turned off, and when charging, the red light D20 flashes, and the green light D10 is always on after being fully charged; the existing circuit is: the negative pole of the green light D10 and the negative pole of the red light D20 are both connected to the GPIO of the Bluetooth chip, and the positive pole of the green light D10 and the positive pole of the red light D20 are both powered by the battery. There is no problem in general use, but when the headset is charging, the headset is turned off. If the headset is fully charged, the headset will stop charging, but at this time the green light D10 will still draw power from the battery, and the battery storage power will be consumed all the time. When the power is lower than a certain voltage limit, it will wake up the 5V charging again.

[0029] There are a series of problems with the existing power supply method. For example, the green light indicates that the battery is fully charged. It is very likely that the battery is not fully charged because the green light consumes the battery power. Moreover, if the headset has not been unplugged from the 5V charging head, when the green light continues to consume the battery power, the battery will fall into a repeated charge and discharge cycle, which will affect the battery life.

[0030] In this embodiment, an indicator light power supply circuit is designed, including a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and a first indicator light. The gate of the MOS tube is connected to the power input terminal, the drain of the MOS tube is connected to the battery input terminal, and the power supply path is switched by controlling the MOS tube. When the headset is charging, the first indicator light is powered by an external power supply, which can not only effectively reduce the power consumption of the Bluetooth headset when it is turned off, but also ensure the battery life.

[0031] In one embodiment, reference Figure 1 The indicator light power supply circuit also includes a second indicator light D12, and the second indicator light D12 is connected to the battery input terminal VBAT.

[0032] Specifically, refer to Figure 1The second indicator light D12 is connected to the battery input terminal VBAT to draw power from the battery input terminal VBAT.

[0033] In one embodiment, reference Figure 1 The first indicator light D13 is green, and the second indicator light D12 is yellow. During normal wearing and use, when not charging and the power is 80-100%, the green light is always on. When charging the earphones, the earphones are turned off, the charging light flashes yellow, and the green light is always on after being fully charged. Since the yellow light is working, it is in the process of charging but not fully charged, and power can be directly drawn from the battery.

[0034] In one embodiment, reference Figure 1 A protection resistor is also provided between the positive electrode of the protection diode D8 and the power input terminal VBUS.

[0035] Specifically, refer to Figure 1 When the Bluetooth headset is charging, the external power supply is connected, the gate G of the MOS tube Q2 is at a high level, the gate G of the MOS tube Q2 is greater than the source S of the MOS tube Q2, the MOS tube Q2 is not turned on, and the voltage of the external power supply is transmitted through the protection resistor and the protection diode D8 to the positive electrode of the first indicator light D13 to power the first indicator light D13.

[0036] like Figure 3 As shown, the utility model also provides a specific embodiment of a Bluetooth system.

[0037] A Bluetooth system, reference Figure 3 The Bluetooth system includes the indicator light power supply device as described above, and also includes a Bluetooth module 1, a USB interface and a battery BAT. The battery BAT and the USB interface are both connected to the Bluetooth module 1, the power input terminal VBUS is connected to the USB interface, the battery input terminal VBAT is connected to the battery BAT, and the first indicator light D13 is connected to the Bluetooth module 1.

[0038] Specifically, refer to Figure 3 The USB interface is used to directly connect to an external power cord. The voltage output end of the USB interface is connected to the power input end VBUS to transmit external power to the Bluetooth system. The USB interface is specifically a Type-C USB interface for inputting 5V voltage, and the battery is used to power various functional modules inside the Bluetooth headset.

[0039] Further, refer to Figure 3The Bluetooth module 1 can adopt the QCC3084 module, the first voltage output end of the USB interface is connected to the first voltage input end of the Bluetooth module 1, the second voltage output end of the USB interface is connected to the voltage input end of the battery, the voltage output end of the battery BAT is connected to the second input end of the Bluetooth module 1, the battery input end VBAT of the indicator light power supply device is connected to the voltage output end of the battery BAT, the power input end VBUS of the indicator light power supply device is connected to the voltage output end of the USB interface, and the first indicator light D13 of the indicator light power supply device is connected to the Bluetooth module 1.

[0040] In one embodiment, reference Figure 3 The indicator light power supply device also includes second indicator lights D12 and D11. Resistors are arranged between the first indicator light D13 and the Bluetooth module 1, between the second indicator light D12 and the Bluetooth module 1, and between the second indicator light D11 and the Bluetooth module 1.

[0041] Specifically, refer to Figure 3 The second indicator lights D12 and D11 are both connected to the Bluetooth module 1 to display different states of the Bluetooth headset; during normal wearing of the Bluetooth headset, when the battery level of the Bluetooth headset is between 80% and 100%, the first indicator light D13 is always on, and when the battery level of the Bluetooth headset is lower than 80%, the second indicator light D12 is on; during charging of the Bluetooth headset, the headset is in the off state, and the second indicator light D12 flashes during charging, and when the battery is fully charged, the first indicator light D13 is always on.

[0042] In one embodiment, reference Figure 3 The Bluetooth system further includes an antenna module ANT, and an output end of the antenna module ANT is connected to an input and output end of the Bluetooth module 1 .

[0043] Specifically, refer to Figure 3 The antenna module ANT is specifically an antenna for receiving and sending wireless signals to ensure that the Bluetooth headset has good wireless signal transmission and reception quality. It can be a PCB antenna, a ceramic antenna, etc., which is selected according to different performance requirements and design requirements.

[0044] In one embodiment, the Bluetooth system further includes a microphone module, and an output end of the microphone module is connected to an input and output end of the Bluetooth module 1 .

[0045] Specifically, refer to Figure 3 The microphone module includes Main MIC and CVC MIC. CVC MIC is used to improve call quality through functions such as noise reduction, echo cancellation and sound enhancement. Especially in noisy environments, CVC MIC can make calls clearer and more accurate.

[0046] In one embodiment, reference Figure 3 The Bluetooth system also includes a speaker module SPKL, and the input end of the speaker module SPKL is connected to the input and output ends of the Bluetooth module 1.

[0047] In one embodiment, reference Figure 3 The Bluetooth system also includes a key module 2, and the output end of the key module 2 is connected to the input and output ends of the Bluetooth module 1.

[0048] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. An indicator light power supply circuit, used in a Bluetooth headset, characterized in that: It includes a power input terminal, a battery input terminal, a MOS tube, a pull-down resistor, a protection diode and a first indicator light; the gate of the MOS tube is connected to the power input terminal, the drain of the MOS tube is connected to the battery input terminal, and the source of the MOS tube is connected to the first indicator light; one end of the pull-down resistor is connected to the gate of the MOS tube, and the other end of the pull-down resistor is grounded; the positive electrode of the protection diode is connected to the power input terminal, and the negative electrode of the protection diode is connected to the first indicator light.

2. The indicator light power supply circuit according to claim 1, characterized in that: It also includes at least one second indicator light, which is connected to the battery input terminal.

3. The indicator light power supply circuit according to claim 1, characterized in that: A current limiting resistor is also provided between the positive electrode of the protection diode and the power input terminal, so as to adjust the current of the first indicator light and balance the brightness of the first indicator light under different power supply states.

4. A Bluetooth system, characterized in that: It includes the indicator light power supply circuit as described in any one of claims 1-3, and also includes a Bluetooth module, a USB interface and a battery, the battery and the USB interface are both connected to the Bluetooth module, the power input terminal is connected to the USB interface, the battery input terminal is connected to the battery, and the first indicator light is connected to the Bluetooth module.

5. The Bluetooth system according to claim 4, characterized in that: The indicator light power supply device also includes at least one second indicator light.

6. The Bluetooth system according to claim 5, characterized in that: Resistors are arranged between the first indicator light and the Bluetooth module, and between the second indicator light and the Bluetooth module.

7. The Bluetooth system according to claim 4, characterized in that: It also includes an antenna module, the output end of which is connected to the input and output end of the Bluetooth module.

8. The Bluetooth system according to claim 4, characterized in that: It also includes a microphone module, the output end of which is connected to the input and output ends of the Bluetooth module.

9. The Bluetooth system according to claim 4, characterized in that: It also includes a speaker module, the input end of the speaker module is connected to the input and output ends of the Bluetooth module.

10. The Bluetooth system according to claim 4, characterized in that: It also includes a key module, the output end of which is connected to the input and output end of the Bluetooth module.

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