Low-cost charging circuit of intelligent sound box

Abstract

The utility model discloses a low-cost charging circuit of an intelligent sound box. The low-cost charging circuit comprises a charging control circuit, a first switching tube circuit, a second switching tube circuit and a third switching tube circuit, the first switching tube circuit is electrically connected with the charging control circuit, the storage battery and the charging power supply; the first switching tube circuit is also electrically connected with the second switching tube circuit; the second switching tube circuit is also electrically connected with the third switching tube circuit; and the third switching tube circuit is also electrically connected with the charging power supply and the charging control circuit respectively. By arranging the first switch tube circuit, the second switch tube circuit and the third switch tube circuit, a charging switch is controlled according to the voltage condition of a storage battery, an independent equipment in-place detection switch needs to be arranged, and the problem that an existing intelligent sound equipment needs to be independently provided with an equipment in-place detection switch, and the equipment in-place detection switch cannot be independently arranged is solved. The cost of the intelligent sound equipment is increased, and the appearance and the structure of the product are influenced.

Description

Technical Field

[0001] This utility model relates to the field of smart speaker charging technology, and in particular to a low-cost charging circuit for smart speakers. Background Technology

[0002] When charging batteries for electronic devices such as audio equipment, the device presence detection switch plays a crucial role in the charging process, detecting the device connection status to determine if the battery is correctly connected to the charging equipment. When the battery and charging equipment are properly connected, the detection switch closes, indicating that the device is in place and the charging circuit can operate normally. If the connection is poor or missing, the switch opens, preventing the charging equipment from starting charging, thus avoiding malfunctions caused by incorrect operation or disconnection. It also prevents accidental operation by preventing the charging equipment from being accidentally started when the battery is not correctly installed or connected, protecting the charging equipment and battery from damage, and ensuring the safety of the operator.

[0003] Common presence detection switches include mechanical microswitches: these are triggered by the mechanical action of the battery connecting to the charging equipment. For example, when the battery is inserted into the charging socket, its casing presses against the button of the microswitch, closing the switch. The charging equipment then detects the presence signal and begins operation. Magnetic induction switches: these have a magnet and a magnetic sensor installed on both the battery and the charging equipment. When the battery approaches the charging equipment and is correctly aligned, the magnetic field of the magnet triggers the magnetic sensor, causing the switch to activate and informing the charging equipment that the battery is in place.

[0004] However, setting up a separate presence detection switch not only affects the appearance and structure of smart speaker devices, but also increases the cost of the product. Summary of the Invention

[0005] In the existing technology, when charging the battery of a smart speaker, a separate device presence detection switch is required, which increases the cost of the smart speaker and also affects the appearance and structure of the product.

[0006] To address the aforementioned issues, a low-cost charging circuit for smart speakers is proposed. By setting up a first switching transistor circuit, a second switching transistor circuit, and a third switching transistor circuit, the charging switch is controlled according to the battery voltage status. This eliminates the need for a separate device presence detection switch, thus solving the problem that existing smart speaker devices require a separate device presence detection switch, which increases the cost of smart speakers and also affects the product's appearance and structure.

[0007] A low-cost charging circuit for a smart speaker includes:

[0008] Charging control circuit;

[0009] First switching transistor circuit;

[0010] Second switching transistor circuit;

[0011] Third switching transistor circuit;

[0012] The first switching transistor circuit is electrically connected to the charging control circuit, the battery, and the charging power supply.

[0013] The first switching transistor circuit is also electrically connected to the second switching transistor circuit;

[0014] The second switching transistor circuit is also electrically connected to the third switching transistor circuit;

[0015] The third switching transistor circuit is also electrically connected to the charging power supply and the charging control circuit, respectively.

[0016] The first switching transistor circuit is used to input a first level signal to the second switching transistor circuit to control the switching of the second switching transistor circuit;

[0017] The second switching transistor circuit is used to input a second level signal to the third switching transistor circuit to control the switching of the third switching transistor circuit;

[0018] The third switching transistor circuit is used to control the switching of the charging control circuit.

[0019] In conjunction with the low-cost smart speaker charging circuit described in this utility model, in a first possible embodiment, the first switching transistor circuit includes:

[0020] The first transistor, the first current-limiting resistor, the second current-limiting resistor, and the first filter capacitor;

[0021] The first end of the first current-limiting resistor is electrically connected to the positive terminal of the battery, and the second end of the first current-limiting resistor is electrically connected to the base of the first transistor and the first end of the second current-limiting resistor.

[0022] The second end of the second current-limiting resistor, the emitter of the first transistor, and the first end of the first filter capacitor are electrically connected, and the second end of the first filter capacitor is grounded.

[0023] In conjunction with the first possible embodiment of this utility model, in the second possible embodiment, the first switching transistor circuit further includes:

[0024] The third current-limiting resistor, the first voltage-dividing resistor, and the second voltage-dividing resistor;

[0025] The first end of the third current-limiting resistor is electrically connected to the charging power supply, and the second end of the third current-limiting resistor is connected together with the second end of the second current-limiting resistor, the emitter of the first transistor, the first end of the first filter capacitor, and the first end of the first voltage divider resistor.

[0026] The second end of the first voltage divider resistor is electrically connected to the first end of the second voltage divider resistor, and the second end of the second voltage divider resistor is grounded.

[0027] In conjunction with the low-cost smart speaker charging circuit described in this utility model, in a third possible embodiment, the second switching transistor circuit includes:

[0028] Second transistor, fourth current-limiting resistor, fifth current-limiting resistor;

[0029] The base of the second transistor is electrically connected to the collector of the first transistor through the fourth current-limiting resistor, and the emitter of the second transistor is grounded.

[0030] The collector of the second transistor is electrically connected to the first end of the fifth current-limiting resistor.

[0031] In conjunction with the low-cost smart speaker charging circuit described in this utility model, in a fourth possible embodiment, the third switching transistor circuit includes:

[0032] MOSFET and sixth current-limiting resistor;

[0033] The gate of the MOS transistor, the first end of the sixth current-limiting resistor, and the second end of the fifth current-limiting resistor are all connected together.

[0034] The second end of the sixth current-limiting resistor is connected to the source of the charging power supply and the MOS transistor.

[0035] The drain of the MOS transistor is electrically connected to the charging control circuit.

[0036] In conjunction with the low-cost smart speaker charging circuit described in this utility model, in a fifth possible embodiment, the charging control circuit includes:

[0037] Charging chip, first filter circuit, second filter circuit, first voltage divider circuit;

[0038] The first terminal of the first filter circuit, the first terminal of the second filter circuit, the first terminal of the first voltage divider circuit, the input pin of the charging chip, and the drain of the MOSFET are all connected together.

[0039] The second terminal of the first filter circuit, the second terminal of the second filter circuit, and the second terminal of the first voltage divider circuit are grounded.

[0040] In conjunction with the fifth possible implementation of this utility model, in the sixth possible implementation, the first voltage divider circuit includes:

[0041] The third and fourth voltage divider resistors;

[0042] The first end of the third voltage divider resistor is connected to the first end of the first filter circuit, the first end of the second filter circuit, the input pin of the charging chip, and the drain of the MOS transistor.

[0043] The first end of the third voltage divider resistor is electrically connected to the first end of the fourth voltage divider resistor, and the second end of the fourth voltage divider resistor is grounded.

[0044] In conjunction with the fifth possible implementation of this utility model, and the seventh possible implementation, the first filter circuit and the second filter circuit respectively include: a second filter capacitor and a third filter capacitor;

[0045] The first end of the second filter capacitor and the first end of the third filter capacitor are connected to the first voltage divider circuit, the input pin of the charging chip, and the drain of the MOSFET.

[0046] The second terminal of the second filter capacitor and the second terminal of the third filter capacitor are respectively grounded.

[0047] In conjunction with the fifth possible embodiment of this utility model, and in the eighth possible embodiment, the charging control circuit further includes:

[0048] Third filter circuit;

[0049] The first end of the third filter circuit is electrically connected to the output pin of the charging chip, and the second end of the first filter circuit is grounded.

[0050] In conjunction with the eighth and ninth possible embodiments of this utility model,

[0051] The third filter circuit includes:

[0052] Fourth filter capacitor;

[0053] The first end of the fourth filter capacitor is electrically connected to the output pin of the charging chip, and the second end of the fourth filter capacitor is grounded.

[0054] The low-cost smart speaker charging circuit described in this utility model controls the charging switch according to the battery voltage by setting a first switching transistor circuit, a second switching transistor circuit, and a third switching transistor circuit. This eliminates the need for a separate device presence detection switch, which increases the cost of smart speakers and affects the appearance and structure of the product. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 This is a block diagram of the charging circuit for a low-cost smart speaker in this utility model.

[0057] Figure 2 This is a circuit diagram of the charging circuit for a low-cost smart speaker in this utility model. Detailed Implementation

[0058] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this utility model.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0060] In the existing technology, when charging the battery of a smart speaker, a separate device presence detection switch is required, which increases the cost of the smart speaker and also affects the appearance and structure of the product.

[0061] To address the above issues, a low-cost charging circuit for smart speakers is proposed.

[0062] A low-cost charging circuit for a smart speaker, such as Figure 1 , Figure 1This is a modular structural diagram of the charging circuit for a low-cost smart speaker according to this utility model, including a charging control circuit 100, a first switching transistor circuit 200, a second switching transistor circuit 300, and a third switching transistor circuit 400. The first switching transistor circuit 200 is electrically connected to the charging control circuit 100, the battery, and the charging power supply. The first switching transistor circuit 200 is also electrically connected to the second switching transistor circuit 300. The second switching transistor circuit 300 is also electrically connected to the third switching transistor circuit 400. The third switching transistor circuit 400 is also electrically connected to the charging power supply and the charging control circuit 100. The first switching transistor circuit 200 is used to input a first-level signal to the second switching transistor circuit 300 to control the switching of the second switching transistor circuit 300. The second switching transistor circuit 300 is used to input a second-level signal to the third switching transistor circuit 400 to control the switching of the third switching transistor circuit 400. The third switching transistor circuit 400 is used to control the switching of the charging control circuit 100. By setting up a first switching transistor circuit 200, a second switching transistor circuit 300, and a third switching transistor circuit 400, the charging switch can be controlled according to the battery voltage status. This eliminates the need for a separate device presence detection switch, thus solving the problem that existing smart speaker devices require a separate device presence detection switch, which increases the cost of smart speakers and also affects the appearance and structure of the product.

[0063] like Figure 2 , Figure 2 This is a circuit diagram of the charging circuit for a low-cost smart speaker according to this utility model. The first switching transistor circuit 200 includes: a first transistor Q1, a first current-limiting resistor R1, a second current-limiting resistor R2, and a first filter capacitor C1; the first end of the first current-limiting resistor R1 is electrically connected to the positive terminal of the battery, the second end of the first current-limiting resistor R1 is electrically connected to the base of the first transistor Q1 and the first end of the second current-limiting resistor R2; the second end of the second current-limiting resistor R2, the emitter of the first transistor Q1, and the first end of the first filter capacitor C1 are electrically connected, and the second end of the first filter capacitor C1 is grounded.

[0064] Please refer to Figure 2 The first switching transistor circuit 200 also includes a third current-limiting resistor R3, a first voltage-dividing resistor R4, and a second voltage-dividing resistor R5; the first end of the third current-limiting resistor R3 is electrically connected to the charging power supply, and the second end of the third current-limiting resistor R3 is connected together with the second end of the second current-limiting resistor R2, the emitter of the first transistor Q1, the first end of the first filter capacitor C1, and the first end of the first voltage-dividing resistor R4; the second end of the first voltage-dividing resistor R4 is electrically connected to the first end of the second voltage-dividing resistor R5, and the second end of the second voltage-dividing resistor R5 is grounded.

[0065] Please refer to Figure 2The second switching transistor circuit 300 includes a second transistor Q2, a fourth current-limiting resistor R6, and a fifth current-limiting resistor R7; the base of the second transistor Q2 is electrically connected to the collector of the first transistor Q1 through the fourth current-limiting resistor R6, and the emitter of the second transistor Q2 is grounded; the collector of the second transistor Q2 is electrically connected to the first end of the fifth current-limiting resistor R7.

[0066] Please refer to Figure 2 The third switching transistor circuit 400 includes a MOSFET Q3 and a sixth current-limiting resistor R; the gate of the MOSFET Q3, the first end of the sixth current-limiting resistor R8, and the second end of the fifth current-limiting resistor R7 are connected together; the second end of the sixth current-limiting resistor R8 is connected together with the charging power supply and the source of the MOSFET Q3; the drain of the MOSFET Q3 is electrically connected to the charging control circuit 100.

[0067] Please refer to Figure 2 The charging control circuit 100 includes a charging chip U1, a first filter circuit, a second filter circuit, and a first voltage divider circuit. The first terminal of the first filter circuit, the first terminal of the second filter circuit, the first terminal of the first voltage divider circuit, the input pin VIN of the charging chip U1, and the drain of the MOSFET are all connected together. The second terminal of the first filter circuit, the second terminal of the second filter circuit, and the second terminal of the first voltage divider circuit are grounded.

[0068] Please refer to Figure 2 The first voltage divider circuit includes a third voltage divider resistor R9 and a fourth voltage divider resistor R10; the first end of the third voltage divider resistor R9 is connected to the first end of the first filter circuit, the first end of the second filter circuit, the input pin VIN of the charging chip U1, and the drain of the MOS transistor Q3; the first end of the third voltage divider resistor R9 is electrically connected to the first end of the fourth voltage divider resistor R10, and the second end of the fourth voltage divider resistor R10 is grounded.

[0069] Please refer to Figure 2 The first filter circuit and the second filter circuit each include: a second filter capacitor C2 and a third filter capacitor C3; the first end of the second filter capacitor C2 and the first end of the third filter capacitor C3 are connected to the first voltage divider circuit, the input pin of the charging chip U1, and the drain of the MOSFET Q3; the second end of the second filter capacitor C2 and the second end of the third filter capacitor C3 are respectively grounded.

[0070] Please refer to Figure 2 The charging control circuit 100 also includes a third filter circuit; the first end of the third filter circuit is electrically connected to the output pin BAT of the charging chip, and the second end of the first filter circuit is grounded.

[0071] Please refer to Figure 2The third filter circuit includes a fourth filter capacitor C4; the first end of the fourth filter capacitor C4 is electrically connected to the output pin BAT of the charging chip U1, and the second end of the fourth filter capacitor C4 is grounded.

[0072] Please refer to Figure 2 The principle of the automatic charging switch in this application is as follows:

[0073] When the battery is connected to the opposite positive and negative terminals of CN1 and CN2, the base (B) voltage of Q1 is equal to the battery voltage. If the battery voltage is less than 4.2V (4.1-2.4V), the emitter (E) and collector (C) of Q1 conduct, and POW_M outputs a high level, which powers the base (B) of Q2 through R6. This conducts the collector (C) and emitter (E) of Q2, pulling down the gate (G) level of Q3, making the source (S) and drain (D) of Q3 conduct. VCC_IN powers the charging chip U1 normally through Q3, and charges the battery through pin 5 of U1. When the battery is charged to 4.2V, the base (B) voltage of Q1 is equal to the emitter (E), and the emitter (E) and collector (C) of Q1 stop conducting. The base (B) voltage of Q2 is 0. At this time, the gate (G) voltage of Q3 is equal to the source (S), and Q3 is turned off, stopping charging.

[0074] The low-cost charging circuit for a smart speaker according to this invention uses a first switching transistor circuit 200, a second switching transistor circuit 300, and a third switching transistor circuit 400 to control the charging switch based on the battery voltage. This eliminates the need for a separate device presence detection switch, which increases the cost of smart speakers and affects their appearance and structure.

[0075] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-cost charging circuit for a smart speaker, characterized in that, include: Charging control circuit; First switching transistor circuit; Second switching transistor circuit; Third switching transistor circuit; The first switching transistor circuit is electrically connected to the charging control circuit, the battery, and the charging power supply. The first switching transistor circuit is also electrically connected to the second switching transistor circuit; The second switching transistor circuit is also electrically connected to the third switching transistor circuit; The third switching transistor circuit is also electrically connected to the charging power supply and the charging control circuit, respectively. The first switching transistor circuit is used to input a first level signal to the second switching transistor circuit to control the switching of the second switching transistor circuit; The second switching transistor circuit is used to input a second level signal to the third switching transistor circuit to control the switching of the third switching transistor circuit; The third switching transistor circuit is used to control the switching of the charging control circuit.

2. The charging circuit for the low-cost smart speaker according to claim 1, characterized in that, The first switching transistor circuit includes: The first transistor, the first current-limiting resistor, the second current-limiting resistor, and the first filter capacitor; The first end of the first current-limiting resistor is electrically connected to the positive terminal of the battery, and the second end of the first current-limiting resistor is electrically connected to the base of the first transistor and the first end of the second current-limiting resistor. The second end of the second current-limiting resistor, the emitter of the first transistor, and the first end of the first filter capacitor are electrically connected, and the second end of the first filter capacitor is grounded.

3. The charging circuit for the low-cost smart speaker according to claim 2, characterized in that, The first switching transistor circuit also includes: The third current-limiting resistor, the first voltage-dividing resistor, and the second voltage-dividing resistor; The first end of the third current-limiting resistor is electrically connected to the charging power supply, and the second end of the third current-limiting resistor is connected together with the second end of the second current-limiting resistor, the emitter of the first transistor, the first end of the first filter capacitor, and the first end of the first voltage divider resistor. The second end of the first voltage divider resistor is electrically connected to the first end of the second voltage divider resistor, and the second end of the second voltage divider resistor is grounded.

4. The charging circuit for the low-cost smart speaker according to claim 1, characterized in that, The second switching transistor circuit includes: Second transistor, fourth current-limiting resistor, fifth current-limiting resistor; The base of the second transistor is electrically connected to the collector of the first transistor through the fourth current-limiting resistor, and the emitter of the second transistor is grounded. The collector of the second transistor is electrically connected to the first end of the fifth current-limiting resistor.

5. The charging circuit for the low-cost smart speaker according to claim 1, characterized in that, The third switching transistor circuit includes: MOSFET and sixth current-limiting resistor; The gate of the MOS transistor, the first end of the sixth current-limiting resistor, and the second end of the fifth current-limiting resistor are all connected together. The second end of the sixth current-limiting resistor is connected to the source of the charging power supply and the MOS transistor. The drain of the MOS transistor is electrically connected to the charging control circuit.

6. The charging circuit for the low-cost smart speaker according to claim 1, characterized in that, The charging control circuit includes: Charging chip, first filter circuit, second filter circuit, first voltage divider circuit; The first terminal of the first filter circuit, the first terminal of the second filter circuit, the first terminal of the first voltage divider circuit, the input pin of the charging chip, and the drain of the MOSFET are all connected together. The second terminal of the first filter circuit, the second terminal of the second filter circuit, and the second terminal of the first voltage divider circuit are grounded.

7. The charging circuit for the low-cost smart speaker according to claim 6, characterized in that, The first voltage divider circuit includes: The third and fourth voltage divider resistors; The first end of the third voltage divider resistor is connected to the first end of the first filter circuit, the first end of the second filter circuit, the input pin of the charging chip, and the drain of the MOS transistor. The first end of the third voltage divider resistor is electrically connected to the first end of the fourth voltage divider resistor, and the second end of the fourth voltage divider resistor is grounded.

8. The charging circuit for the low-cost smart speaker according to claim 6, characterized in that, The first filter circuit and the second filter circuit each include: a second filter capacitor and a third filter capacitor; The first end of the second filter capacitor and the first end of the third filter capacitor are connected to the first voltage divider circuit, the input pin of the charging chip, and the drain of the MOSFET. The second terminal of the second filter capacitor and the second terminal of the third filter capacitor are respectively grounded.

9. The charging circuit for the low-cost smart speaker according to claim 6, characterized in that, The charging control circuit also includes: Third filter circuit; The first end of the third filter circuit is electrically connected to the output pin of the charging chip, and the second end of the first filter circuit is grounded.

10. The charging circuit for the low-cost smart speaker according to claim 9, characterized in that, The third filter circuit includes: Fourth filter capacitor; The first end of the fourth filter capacitor is electrically connected to the output pin of the charging chip, and the second end of the fourth filter capacitor is grounded.

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