Power supply circuit for wireless earphone

Abstract

The present disclosure describes a power supply circuit for a wireless earpiece, which includes a first charging terminal, a second charging terminal, a charger, a battery circuit, and a control circuit. The charger is enabled via a voltage on the first charging terminal and the second charging terminal, and charges the battery circuit. The first charging terminal further provides a control signal to the control circuit. Based on the control signal, the control circuit enables or disables power supplied from the battery circuit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a power supply circuit, and in particular, to a power supply circuit for a wireless earphone. BACKGROUND

[0002] With the rapid development of wireless technology, the use of wireless earphones has also become more and more widespread. Wireless earphones are usually equipped with corresponding charging boxes for storing and charging the wireless earphones. When the earphones are placed in the charging box, most of the circuits and components in the wireless earphone circuit are still consuming power, resulting in low charging efficiency.

[0003] Therefore, an improved power supply circuit must be provided to improve the charging efficiency of the wireless earphone. SUMMARY

[0004] According to one or more embodiments of the present disclosure, a power supply circuit for a wireless earphone is provided. The power supply circuit can include a first charging terminal, a second charging terminal, a charger, a battery circuit, and a control circuit. The charger can be enabled via a voltage on the first charging terminal and the second charging terminal, and can be connected to and charge the battery circuit. The control circuit can also be connected to the first charging terminal and the battery circuit, and configured to enable or disable power supply from the battery circuit based on a control signal provided by the first charging terminal.

[0005] According to one or more embodiments of the present disclosure, a wireless earphone is provided. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 A schematic block diagram of a power supply circuit of a wireless earphone according to one or more embodiments of the present disclosure is shown.

[0007] Figure 2 A schematic block diagram of a power supply circuit of a wireless earphone according to one or more embodiments of the present disclosure is shown.

[0008] Figure 3 A schematic block diagram of a power supply circuit of a wireless earphone according to one or more embodiments of the present disclosure is shown.

[0009] Figure 4 A schematic block diagram of a power supply circuit of a wireless earphone according to one or more embodiments of the present disclosure is shown.

[0010] Figure 5 A schematic block diagram of a power supply circuit of a wireless earphone according to one or more embodiments of the present disclosure is shown.

[0011] To aid in understanding, identical reference numerals have been used, where possible, to designate identical elements that are common between the figures. It is contemplated that elements disclosed in one embodiment can be advantageous ly used in another embodiment without specific recitation. The drawings are not to be construed as being to scale unless specifically noted. Furthermore, elements of the drawings can be shown in a simplified form and with non-essential details or components omitted for the sake of clarity and ease of understanding. The drawings and discussion are used to explain the principles of the discussion that follows, where like numerals indicate like elements. DETAILED DESCRIPTION

[0012] Examples will be provided below for illustration. The description of the various examples is presented solely to explain the principles of the disclosure and is not intended to be exhaustive or to limit the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

[0013] Figure 1 A schematic block diagram of a power supply circuit in a wireless earbud is shown in accordance with one or more embodiments of the disclosure.

[0014] As Figure 1 The power supply circuit for the wireless earbud 100 includes a first charging terminal 110A, a second charging terminal 110B, a charger 120, a battery circuit 130, and a control circuit 140, as shown in

[0015] The charger 120 generally controls the charging process for the battery circuit 130. For example, the charger 120 can be enabled via the voltage on the first charging terminal 110A and the second charging terminal 110B, and then can charge the battery circuit 130. When the earbud is placed in the charging case, the first charging terminal 110A and the second charging terminal 110B can be electrically connected to the corresponding charging case. To illustrate, Figure 1 The second charging terminal 110B is shown grounded. The control circuit 140 can also be connected to the first charging terminal 110A and the battery circuit 130, and can enable or disable the power supplied from the battery circuit 130 based on a control signal provided by the first charging terminal 110A. When the wireless earbud is placed in the charging case, the voltage level at the first charging terminal is high, and the voltage on the first charging terminal 110A and the second charging terminal 110B is greater than zero. Then, the charger 120 can control the charging process and start charging the battery circuit 130. The first charging terminal 110A further provides a control signal to the control circuit 140. Based on the control signal, the control circuit 140 enables or disables the power supply from the battery circuit.

[0016] Figure 2 A schematic block diagram of a power supply circuit in a wireless earbud is shown in accordance with one or more embodiments of the disclosure. As Figure 2As shown in FIG. 2, the first charging terminal 210A and the second charging terminal 210B can be electrically connected to the charger 220, and the charger 220 can charge the battery circuit including the battery protection circuit 231 and the battery 232. The voltage at the first charging terminal 210A and the second charging terminal 210B can be indicated by Vcha+ and Vcha-, respectively. The battery 232 is a power source. The battery protection circuit 231 prevents overcharging, over-discharging, over-current, etc. of the battery 232. The switch circuit 240 is controlled by a control signal from the first charging terminal 210A. For example, the control signal can be a voltage level signal. When the voltage level signal indicates a high level, the switch circuit 240 is off, and when the voltage level signal indicates a low level, the switch circuit 240 is on. Figure 2 Also shown is a regulator 250, which is generally used to change the battery voltage to a voltage suitable for other components (not shown), and a reset terminal 260, which is used to reset the earphone. When the voltage (Vbat) at the reset terminal 260 is a high level, the earphone can be reset. For ease of illustration, the regulator, the reset terminal, and other components (not shown) powered by the battery circuit are collectively referred to as a post-stage circuit in the following context.

[0017] When the wireless earphone is put into the charging case, the first charging terminal 210A and the second charging terminal 210B can be electrically connected to the charging case, and the voltage level Vcha+ at the first charging terminal 210A will be a high level. The control signal from the charging terminal 210A is a high level signal, and the switch circuit 240 is off. The power of the battery 232 will not pass through the switch circuit 240. Therefore, the post-stage circuit cannot be powered by the battery 240. For example, the voltage Vbat is 0, the regulator 250 does not work, and all components powered by VCC are off. When the wireless earphone is taken out of the charging case, the control signal becomes a low level signal, and the switch circuit 240 is on. The power of the battery passes through the switch circuit 240. The battery 232 can power the post-stage circuit. The voltage Vbat becomes high, and the earphone is thereby reset, for example, from power-off to power-on.

[0018] Figures 3 to 5 Different power supply circuits in an earphone according to one or more embodiments of the present disclosure are shown, in which the switch circuit can be implemented as a p-MOSFET switch, an electronic switch, and a transistor PNP switch, respectively.

[0019] In Figure 3In the circuit shown, a p-MOSFET (p-channel MOSFET) switch 340 is used to control the power supply from a battery circuit, which includes a battery protection circuit 331 and a battery 332. The gate of the p-MOSFET switch 340 is connected to a first charging terminal 310A, the drain of the p-MOSFET switch 340 is connected to the output of the battery circuit, and the source of the p-MOSFET switch 340 is connected to subsequent circuitry, such as a regulator 350, a reset terminal 360, and other components (not shown) connected to a wireless headset. A second charging terminal 310B is grounded, and the first charging terminal 310A may be grounded via a resistor. The charger 320 controls the charging process via the voltage on the first charging terminal 310A and the second terminal 310B.

[0020] When the wireless earbuds are placed in the charging case, the voltage level Vcha+ at the first charging terminal 310A is high. The control signal from the first charging terminal 310A is high, and the gate of the p-MOSFET switch 340 is high. Therefore, the p-MOSFET is disabled. Power from the battery 332 will not pass through the switching circuit (p-MOSFET switch 340). Therefore, the subsequent circuits cannot be powered by the battery 332. For example, the voltage Vbat is 0, the regulator 350 does not work, and all components powered by VCC are turned off. When the wireless earbuds are removed from the charging case, the control signal goes low, and the gate of the p-MOSFET 340 goes low. The p-MOSFET is thus enabled. Power from the battery 332 passes through the switching circuit. Therefore, the battery 332 can power the subsequent circuits. The voltage Vbat goes high, and it resets the earbuds, for example, allowing the earbuds to reset from power-off to power-on.

[0021] exist Figure 4 In the circuit shown, electronic switch 440 controls the power supply from a battery circuit, which may include a battery protection circuit 431 and a battery 432. The control terminal (i.e., the enable pin (EN)) of electronic switch 440 is connected to the first charging terminal 410A (Vcha+), the input (IN) of electronic switch 440 is connected to the output of the battery circuit, and the output (OUT) of electronic switch 440 can be used as an input to subsequent circuitry, such as an input to a regulator 450, a reset terminal 460, and other components (not shown) in a wireless headset circuit. The second charging terminal 410B is grounded, and the first charging terminal 410A can be grounded via a resistor. Charger 420 controls the charging process via the voltage on the first charging terminal 410A and the second terminal 410B.

[0022] When the wireless earpiece is put into the charging case, the voltage level at the first charging terminal 410A becomes high (Vcha+). The control signal from the charging terminal 410A is a high level signal, and the enable pin (EN) of the electronic switch 440 will be high. Thus, the electronic switch 440 is off. The power of the battery will not pass through the electronic switch 440. Thus, the back-end circuit cannot be powered by the battery 432. For example, the voltage Vbat is 0, the regulator 450 does not work, and all components powered by VCC are off. When the wireless earpiece is taken out of the charging case, the control signal becomes a low level signal, and the enable pin (EN) of the electronic switch 440 will be low. Thus, the electronic switch 440 is on. The power of the battery 432 passes through the electronic switch 440. Then, the battery can power the back-end circuit. The voltage Vbat becomes high, which resets the earpiece, for example, the earpiece can be reset from power off to power on.

[0023] In the circuit shown in Figure 5 , a transistor (PNP) switch 540 is used to control the power supply from the battery circuit, which can include a battery protection circuit 531 and a battery 532. The base of the PNP transistor switch 540 is connected to the first charging terminal 510A, the emitter of the PNP transistor switch 540 is connected to the output of the battery circuit, and the collector of the PNP transistor switch 540 is connected to the back-end circuit, such as the regulator 550, the reset terminal 560 and other components (not shown) in the circuit of the wireless earpiece. The second charging terminal 510B is grounded, and the first charging terminal 510A can be grounded via a resistor. The charger 520 controls the charging process via the voltage on the first charging terminal 510A and the second terminal 510B.

[0024] When the wireless earpiece is put into the charging case, the voltage level Vcha+ at the first charging terminal 510A becomes high. The control signal from the first charging terminal 510A is a high level signal, and the base of the PNP transistor will be high. Thus, the PNP transistor is disabled. The power of the battery will not pass through the switch circuit 540. Thus, the back-end circuit cannot be powered by the battery 532. For example, the voltage Vbat at the reset terminal 560 is 0, the regulator 550 does not work, and all components powered by VCC are off. When the wireless earpiece is taken out of the charging case, the control signal becomes a low level signal, and the base of the PNP transistor 540 will be low. The PNP transistor 540 can thus be enabled. The power of the battery passes through the switch circuit. Thus, the battery 532 can power the back-end circuit. The voltage Vbat becomes high, which resets the earpiece, for example, the earpiece can be reset from power off to power on.

[0025] With the power supply circuit of the present disclosure, when the wireless earphone is put into the charging case, the power of most of the components is cut off in addition to the charger and the battery circuit. That is, when the wireless earphone is in the charging case, the power consumption of the earphone is low. Thereby, the charging efficiency of the wireless earphone can be improved. In addition, when the wireless earphone is put into the charging case and taken out of the charging case, the wireless earphone can be reset by power-off and power-on.

[0026] The description of various embodiments has been presented for purposes of illustration, but is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the embodiments, the practical application of the technology found in the market, or the technical improvements over the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

[0027] In the foregoing, reference has been made to embodiments presented in the present disclosure. However, the scope of the present disclosure is not limited to the specifically described embodiments. Rather, any combination of the aforementioned features and elements, whether related to different embodiments or not, can be expected to implement and practice the contemplated embodiments. Furthermore, although the embodiments disclosed herein can achieve advantages over other possible solutions or over the prior art, whether or not a given embodiment achieves advantages over other possible solutions is not a limiting consideration. Thus, the aforementioned aspects, features, embodiments and advantages are merely illustrative and not all encompassing, and are not intended to limit the scope of the claims appended hereto or following below, unless explicitly recited in the claims.

[0028] Aspects of the present disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, microcode, etc.) or an embodiment combining software and hardware aspects that can all generally be referred to herein as a "circuit," "module" or "system."

[0029] While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure can be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. A power supply circuit for wireless headphones, comprising: A charger, which is activated via voltages on a first charging terminal and a second charging terminal; A battery circuit, which is connected to the charger; A control circuit, connected to the first charging terminal and the battery circuit, and configured to enable or disable power supply from the battery circuit based on a control signal provided by the first charging terminal; and The subsequent circuit connected to the control circuit; The control circuit includes a switching circuit; In response to a high-level control signal from the first charging terminal, the switching circuit is turned off, and power supply from the battery circuit to the subsequent circuit is disabled. In response to a low-level control signal from the first charging terminal, the switching circuit is turned on, enabling power supply from the battery circuit to the subsequent circuit.

2. The power supply circuit according to claim 1, wherein the switching circuit is a MOSFET switch, wherein the gate of the MOSFET switch is connected to the first charging terminal, the drain of the MOSFET switch is connected to the output of the battery circuit, and the source of the MOSFET switch is connected to the subsequent circuit.

3. The power supply circuit according to claim 1, wherein the switching circuit is an electronic switch, the control terminal of the electronic switch is connected to the first charging terminal, the input of the electronic switch is connected to the output of the battery circuit, and the output of the electronic switch is connected to the subsequent circuit.

4. The power supply circuit according to claim 1, wherein the switching circuit is a PNP transistor switch, the base of the PNP transistor switch is connected to the first charging terminal, the emitter of the PNP transistor switch is connected to the output of the battery circuit, and the collector of the PNP transistor switch is connected to the subsequent circuit.

5. The power supply circuit according to any one of claims 1 to 4, wherein the output of the switching circuit is connected to a reset circuit for resetting the earphone.

6. The power supply circuit according to any one of claims 1 to 4, wherein the first charging terminal and the second charging terminal are configured to be connected to a charging case.

7. The power supply circuit according to claim 6, wherein... When the wireless earbuds are placed in the charging case, the switching circuit is turned off based on the control signal, wherein the control signal from the first charging terminal is a high-level signal; and When the wireless earphones are removed from the charging case, the switching circuit is turned on based on the control signal, wherein the control signal from the first charging terminal is a low-level signal, the battery circuit supplies power to the subsequent circuitry, and the wireless earphones are reset.

8. The power supply circuit according to claim 1, wherein the second charging terminal is grounded.

9. A wireless earphone comprising a power supply circuit according to any one of claims 1 to 8.

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