Power supply circuit of electric toothbrush and electric toothbrush

Abstract

The utility model relates to the technical field of power supply circuits, and discloses a power supply circuit of an electric toothbrush and the electric toothbrush, and the power supply circuit of the electric toothbrush comprises a single battery, a booster circuit and a toothbrush motor, the boost circuit comprises a boost chip, an input circuit and an output circuit, the boost chip at least comprises a voltage input pin, a voltage output pin and an enabling pin, the input end of the input circuit is connected with the positive electrode of the single battery, and the output end of the input circuit is connected with the voltage input pin and the enabling pin of the boost chip. The input end of the output circuit is connected with the voltage output pin, the output end of the output circuit is connected with the toothbrush motor, the mode that a plurality of batteries are connected in series to supply power to the toothbrush motor is not needed any more, and therefore cost and the size of the electric toothbrush are greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a power supply circuit for an electric toothbrush and an electric toothbrush. Background Technology

[0002] Currently, the operating voltage of the motors used in electric toothbrushes is generally higher than that of a single lithium battery, so a single lithium battery cannot be used to directly power these electric toothbrushes.

[0003] Therefore, most existing electric toothbrushes use two lithium batteries connected in series to power them. However, connecting two lithium batteries in series significantly increases the cost of the electric toothbrush and also greatly increases the internal space required to house the lithium batteries, resulting in a larger overall size of the electric toothbrush. Utility Model Content

[0004] In view of this, the present invention provides a power supply circuit for an electric toothbrush and an electric toothbrush, so as to solve or partially solve the technical problems of large size and high cost of existing electric toothbrushes.

[0005] The technical solution proposed by this utility model is as follows:

[0006] In a first aspect, this utility model provides a power supply circuit for an electric toothbrush, including a single battery, a boost circuit, and a toothbrush motor; the boost circuit includes a boost chip, an input circuit, and an output circuit. The boost chip includes at least a voltage input pin, a voltage output pin, and an enable pin. The input terminal of the input circuit is connected to the positive terminal of the single battery. The output terminal of the input circuit is connected to the voltage input pin and the enable pin of the boost chip, respectively. The input terminal of the output circuit is connected to the voltage output pin. The output terminal of the output circuit is connected to the toothbrush motor. The boost chip receives the input voltage and enable signal from the single battery through the input circuit, converts the voltage of the single battery into the operating voltage of the toothbrush motor, and then outputs the operating voltage to the toothbrush motor through the output circuit.

[0007] Optionally, the input circuit includes a first resistor and an input capacitor combination. The positive terminal of the single battery is connected to one end of the input capacitor combination, and the other end of the input capacitor combination is connected to ground. One end of the first resistor is connected to one end of the input capacitor combination and the voltage input pin, respectively, and the other end of the first resistor is connected to the enable pin. The input terminal of the input circuit includes one end of the input capacitor combination, and the output terminal of the input circuit includes both ends of the first resistor.

[0008] Optionally, the input capacitor assembly includes at least two input capacitors connected in parallel, one end of which is connected to the positive terminal of the single battery cell, and the other end of which is connected to ground.

[0009] Optionally, the boost chip further includes a startup pin, a switching node pin, and an FSW / NC pin. The input circuit further includes a first inductor, a ninth capacitor, a sixth resistor, and a seventh resistor. One end of the first inductor is connected to one end of the first resistor and one end of the input capacitor, respectively. The other end of the first inductor is connected to the startup pin. One end of the ninth capacitor is connected to the other end of the first inductor and one end of the sixth resistor, respectively. The other end of the ninth capacitor is connected to the startup pin. The other end of the sixth resistor is connected to one end of the seventh resistor. The other end of the seventh resistor is connected to ground. The FSW / NC pin is connected to the other end of the sixth resistor or the FSW / NC pin is left floating.

[0010] Optionally, the boost chip further includes an output voltage feedback pin. The output circuit includes a second resistor, a third resistor, an eleventh capacitor, and an output capacitor combination. One end of the output capacitor combination is connected to the voltage output pin, and the other end of the output capacitor combination is connected to ground. One end of the second resistor is connected to the voltage output pin, and the other end of the second resistor is connected to one end of the third resistor. The other end of the third resistor is connected to ground. The other end of the second resistor is also connected to the output voltage feedback pin and one end of the eleventh capacitor. The other end of the eleventh capacitor is connected to one end of the second resistor and the toothbrush motor, respectively. The input terminal of the output circuit includes one end of the output capacitor combination, and the output terminal of the output circuit includes the other end of the eleventh capacitor.

[0011] Optionally, the output capacitor assembly includes at least two output capacitors connected in parallel, one end of which is connected to the voltage output pin, and the other end of which is connected to ground.

[0012] Optionally, the power supply circuit of the electric toothbrush further includes a loop compensation circuit, and the boost chip further includes an error amplifier output pin, which is connected to ground through the loop compensation circuit.

[0013] Optionally, the loop compensation circuit includes a fifth resistor, a twelfth capacitor, and a thirteenth capacitor, which are connected end-to-end in sequence. The connection point of the fifth resistor and the twelfth capacitor is connected to the output pin of the error amplifier, and the connection point of the twelfth capacitor and the thirteenth capacitor is connected to the ground wire.

[0014] Optionally, the boost chip is an SGM6611C chip.

[0015] Secondly, this utility model provides an electric toothbrush, including a power supply circuit for the electric toothbrush as described in any of the first aspects.

[0016] The power supply circuit and electric toothbrush of this utility model have the following beneficial effects:

[0017] This invention discloses a power supply circuit for an electric toothbrush, comprising a single battery, a boost circuit, and a toothbrush motor. The boost circuit includes a boost chip, an input circuit, and an output circuit. The input circuit converts the voltage of the single battery into an input voltage and an enable signal. The input voltage and enable signal are respectively input to the voltage input pin and enable pin of the boost chip, thereby enabling the boost chip to convert the voltage of the single battery into the operating voltage of the toothbrush motor. The output circuit then outputs the operating voltage to the toothbrush motor, thus enabling the single battery to be boosted to a stable voltage to power the toothbrush motor. This eliminates the need to use multiple batteries connected in series to power the toothbrush motor, significantly reducing the cost and size of the electric toothbrush. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying 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.

[0019] Figure 1 This is a circuit block diagram of the power supply circuit of the electric toothbrush according to an embodiment of the present utility model;

[0020] Figure 2 This is a circuit diagram of the power supply circuit of the electric toothbrush according to an embodiment of the present invention.

[0021] Marker explanation:

[0022] Single battery - 1; Boost circuit - 2; Toothbrush motor - 3; 21 - Input circuit; 22 - Boost chip; Output circuit - 23; Loop compensation circuit - 24. Detailed Implementation

[0023] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] To address the current problems with electric toothbrush batteries, this invention employs a single-cell battery with a boost circuit to raise the voltage to a stable level before powering the electric toothbrush motor. This solves the problem of a single-cell battery being unable to power the electric toothbrush, thereby reducing costs and minimizing the size of the electric toothbrush.

[0028] like Figure 1 and Figure 2 As shown, the power supply circuit of the electric toothbrush in this embodiment of the present invention includes a single battery, a boost circuit, and a toothbrush motor. The boost circuit includes a boost chip 22, an input circuit 21, and an output circuit. The boost chip 22 includes at least a voltage input pin, a voltage output pin, and an enable pin. The input terminal of the input circuit 21 is connected to the positive terminal of the single battery. The output terminal of the input circuit 21 is connected to the voltage input pin and the enable pin of the boost chip 22, respectively. The input terminal of the output circuit is connected to the voltage output pin, and the output terminal of the output circuit is connected to the toothbrush motor. The boost chip 22 receives the input voltage and enable signal of the single battery through the input circuit 21, converts the voltage of the single battery into the working voltage of the toothbrush motor, and then outputs the working voltage to the toothbrush motor through the output circuit.

[0029] Specifically, each battery uses a single lithium battery, with a voltage typically of 3.7V.

[0030] The operating voltage of a toothbrush motor is generally greater than 3.7V. For example, the operating voltage of the toothbrush motor in a vibrating electric toothbrush can be 7.6V.

[0031] The main function of the boost circuit is to increase the voltage of a single battery to a working voltage that can meet the power supply requirements of the toothbrush motor.

[0032] The boost chip 22 is a DC-to-DC boost chip. When its enable pin receives a high-level signal from the input circuit 21, it boosts the voltage received by the voltage output pin to obtain the working voltage of the toothbrush motor, and outputs the working voltage to power the toothbrush motor through the output circuit.

[0033] This invention discloses a power supply circuit for an electric toothbrush. The input circuit 21 converts the voltage of a single battery into an input voltage and an enable signal. These are then input to the voltage input pin and enable pin of a boost chip 22, respectively. The boost chip 22 converts the voltage of the single battery into the operating voltage of the toothbrush motor, and the output circuit outputs this operating voltage to the toothbrush motor. This allows the single battery to be boosted to a stable voltage to power the toothbrush motor, eliminating the need for multiple batteries connected in series. This significantly reduces cost and the size of the electric toothbrush.

[0034] The enable signal received by the enable pin of the boost chip 22 is provided by a single battery, eliminating the need for an additional controller. This reduces the use of electronic components and further lowers the cost of the electric toothbrush.

[0035] In some embodiments, the input circuit 21 includes a first resistor R1 and an input capacitor combination. The positive terminal of the single battery is connected to one end of the input capacitor combination, and the other end of the input capacitor combination is connected to ground. One end of the first resistor R1 is connected to one end of the input capacitor combination and a voltage input pin, and the other end of the first resistor R1 is connected to an enable pin. The input terminal of the input circuit 21 includes one end of the input capacitor combination, and the output terminal of the input circuit 21 includes both ends of the first resistor R1.

[0036] The purpose of connecting the input capacitor combination is to stabilize the voltage of a single battery cell.

[0037] The first resistor R1 is used for current limiting. Connecting a single battery cell to the enable pin through the first resistor R1 can control the boost chip 22 to work or disable it. No additional controller is needed to control the boost chip 22, thus reducing the circuit size.

[0038] Specifically, the input capacitor assembly includes at least two input capacitors connected in parallel, with one end of each input capacitor connected to the positive terminal of a single battery cell and the other end connected to ground.

[0039] In one example, there are three input capacitors: a first capacitor C1, a second capacitor C2, and a third capacitor C3, which are connected in parallel.

[0040] In another example, there are two input capacitors, namely a first capacitor C1 and a second capacitor C2, which are connected in parallel.

[0041] In some embodiments, the boost chip 22 further includes a startup pin, a switching node pin, and an FSW / NC pin. The input circuit 21 further includes a first inductor L1, a ninth capacitor C9, a sixth resistor R6, and a seventh resistor R7. One end of the first inductor L1 is connected to one end of the first resistor R1 and one end of the input capacitor, and the other end of the first inductor L1 is connected to the startup pin. One end of the ninth capacitor C9 is connected to the other end of the first inductor L1 and one end of the sixth resistor R6, and the other end of the ninth capacitor C9 is connected to the startup pin. The other end of the sixth resistor R6 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to ground. The frequency setting wire (FSW) / normally closed (Not Connected, NC) pin is connected to the other end of the sixth resistor R6, or the FSW / NC pin is left floating.

[0042] Specifically, the positive terminal of the single battery and one end of the input capacitor combination are connected to one end of the first inductor L1. The other end of the first inductor L1 is connected to the switching node pin of the boost chip 22. A ninth capacitor C9 is connected between the switching node pin and the start-up pin of the boost chip 22. The ninth capacitor C9 is a capacitor with a small capacitance value. The FSW / NC pin of the boost chip 22 can be left floating, or the FSW / NC pin can be connected between the sixth resistor R6 and the seventh resistor R7. The switching frequency of the boost chip 22 can be adjusted according to the resistance values ​​of the sixth resistor R6 and the seventh resistor R7.

[0043] Furthermore, the boost chip 22 also includes an output voltage feedback pin. The output circuit includes a second resistor R2, a third resistor R3, an eleventh capacitor C11, and an output capacitor combination. One end of the output capacitor combination is connected to the voltage output pin, and the other end of the output capacitor combination is connected to ground. One end of the second resistor R2 is connected to the voltage output pin, and the other end of the second resistor R2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to ground. The other end of the second resistor R2 is also connected to the output voltage feedback pin and one end of the eleventh capacitor C11. The other end of the eleventh capacitor C11 is connected to the toothbrush motor. The input terminal of the output circuit includes one end of the output capacitor combination, and the output terminal of the output circuit includes the other end of the eleventh capacitor C11.

[0044] Specifically, the output capacitor combination includes at least two output capacitors connected in parallel. The voltage output pin of the boost chip 22 is connected to one or more output capacitors and serves as the positive input terminal of the power supply for the toothbrush motor. The output voltage feedback pin of the chip is connected to two feedback resistors, namely the second resistor R2 and the third resistor R3, to regulate the output voltage of the chip. The third resistor R3 is grounded, and the second resistor R2 is connected to the voltage output pin after the output capacitors. An eleventh capacitor C11 is connected in parallel across the second resistor R2 to filter out high-frequency interference in the output voltage, stabilize the output voltage, and reduce the ripple of the output voltage.

[0045] Furthermore, at least two output capacitors are provided, with different output capacitors connected in parallel. One end of the parallel connection is connected to the toothbrush motor, and the other end is connected to the ground wire.

[0046] For example, there are five output capacitors, namely the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7, which are connected in parallel between the ground line and the voltage output pin.

[0047] Alternatively, there are two output capacitors, namely the fourth capacitor C4 and the fifth capacitor C5, which are connected in parallel between the ground wire and the voltage output pin.

[0048] In some embodiments, the power supply circuit of the electric toothbrush further includes a loop compensation circuit, and the boost chip 22 further includes an error amplifier output pin, which is connected to the ground line through the loop compensation circuit.

[0049] Specifically, the loop compensation circuit includes a fifth resistor R5, a twelfth capacitor C12, and a thirteenth capacitor C13. The fifth resistor R5, the twelfth capacitor C12, and the thirteenth capacitor C13 are connected end to end in sequence. The connection point of the fifth resistor R5 and the twelfth capacitor C12 is connected to the output pin of the error amplifier, and the connection point of the twelfth capacitor and the thirteenth capacitor C13 is connected to the ground wire.

[0050] The main function of this loop compensation circuit is to stabilize the output.

[0051] In some embodiments, the boost chip 22 is an SGM6611C chip. The voltage input pin of the SGM6611C chip is the VIN pin, the voltage output pin is the VOUT pin, the enable pin is the EN pin, the startup pin is the BOOT pin, the switching node pin is the SW pin, the output voltage feedback pin is the FB pin, and the error amplifier output pin is the COMP pin.

[0052] In addition, the SGM6611C chip also includes VCC pin, GND pin, and ILIM pin. The VCC pin of the SGM6611C chip is the output pin of the internal regulator of the chip, which is connected to the tenth capacitor C10 to the ground line. The GND pin is the ground pin, which is directly grounded. The ILIM pin of the SGM6611C chip is the peak current limiting pin, and the current limit can be set by connecting the fourth resistor R4 to ground.

[0053] By using the SGM6611C chip as a boost chip 22, the voltage can be boosted to a higher level while providing a larger current, which can meet the current required for the normal operation of the toothbrush motor.

[0054] This utility model also provides an electric toothbrush, including a power supply circuit as described in any of the above embodiments.

[0055] This utility model discloses a power supply circuit for an electric toothbrush. The electric toothbrush uses an input circuit 21 to input the voltage of a single battery to the voltage input pin and enable pin of a boost chip 22. The boost chip 22 then converts the voltage of the single battery into the working voltage of the toothbrush motor and outputs the working voltage to the toothbrush motor through an output circuit. This allows the single battery to be boosted to a stable voltage to power the toothbrush motor, eliminating the need to use multiple batteries connected in series to power the toothbrush motor, thus greatly reducing costs and the size of the electric toothbrush.

[0056] Using the SGM6611C chip as a boost chip 22, along with some external components such as capacitors, resistors, and inductors, a boost circuit is formed, which realizes the boosting of a single battery to a stable voltage to power the motor of the electric toothbrush. It can boost the voltage to a higher level while providing a larger current, which can meet the current required for the normal operation of the toothbrush motor, and the cost is low.

[0057] The enable signal received by the enable pin of the boost chip 22 is provided by a single battery, eliminating the need for an additional controller. This reduces the use of electronic components and further lowers the cost of the electric toothbrush.

[0058] Although the exemplary embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions and modifications to these embodiments without departing from the spirit and scope of protection of this utility model, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A power supply circuit for an electric toothbrush, characterized by comprising: The single battery, the boost circuit and the toothbrush motor are included; The boost circuit includes a boost chip, an input circuit and an output circuit, the boost chip includes at least a voltage input pin, a voltage output pin and an enable pin, the input end of the input circuit is connected with the positive pole of the single battery, the output end of the input circuit is connected with the voltage input pin and the enable pin of the boost chip respectively, the input end of the output circuit is connected with the voltage output pin, and the output end of the output circuit is connected with the toothbrush motor; the boost chip receives the input voltage and the enable signal of the single battery through the input circuit, converts the voltage of the single battery into the working voltage of the toothbrush motor, and then outputs the working voltage to the toothbrush motor through the output circuit.

2. The power supply circuit for an electric toothbrush according to claim 1, wherein The input circuit includes a first resistor and an input capacitor combination, one end of the input capacitor combination is connected with the positive pole of the single battery, and the other end of the input capacitor combination is connected with the ground wire; one end of the first resistor is connected with one end of the input capacitor combination and the voltage input pin respectively, and the other end of the first resistor is connected with the enable pin. The input end of the input circuit includes one end of the input capacitor combination, and the output end of the input circuit includes both ends of the first resistor.

3. The power supply circuit for an electric toothbrush according to claim 2, wherein The input capacitor combination includes at least two input capacitors connected in parallel with each other, one end of the input capacitor is connected with the positive pole of the single battery, and the other end of the input capacitor is connected with the ground wire.

4. The power supply circuit for an electric toothbrush according to claim 3, wherein The boost chip further includes a start pin, a switch node pin and an FSW / NC pin, the input circuit further includes a first inductor, a ninth capacitor, a sixth resistor and a seventh resistor, one end of the first inductor is connected with one end of the first resistor and one end of the input capacitor respectively, the other end of the first inductor is connected with the start pin, one end of the ninth capacitor is connected with the other end of the first inductor and one end of the sixth resistor respectively, the other end of the ninth capacitor is connected with the start pin, the other end of the sixth resistor is connected with one end of the seventh resistor, the other end of the seventh resistor is connected with the ground wire, and the FSW / NC pin is connected with the other end of the sixth resistor or the FSW / NC pin is suspended.

5. The power supply circuit for an electric toothbrush according to claim 1, wherein The boost chip further includes an output voltage feedback pin, the output circuit includes a second resistor, a third resistor, an eleventh capacitor and an output capacitor combination, one end of the output capacitor combination is connected with the voltage output pin, the other end of the output capacitor combination is connected with the ground wire, one end of the second resistor is connected with the voltage output pin, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is connected with the ground wire, and the other end of the second resistor is further connected with the output voltage feedback pin and one end of the eleventh capacitor, the other end of the eleventh capacitor is connected with one end of the second resistor and the toothbrush motor respectively; The input end of the input circuit includes one end of the input capacitor combination, and the output end of the input circuit includes both ends of the first resistor.

6. The power supply circuit for an electric toothbrush according to claim 5, wherein The output capacitor combination comprises at least two output capacitors connected in parallel with each other, one end of the output capacitors being connected to the voltage output pin, and the other end of the output capacitors being connected to the ground wire.

7. The power supply circuit for an electric toothbrush according to claim 1, wherein The power supply circuit of the electric toothbrush further comprises a loop compensation circuit, and the boost chip further comprises an error amplifier output pin, which is connected to the ground wire through the loop compensation circuit.

8. The power supply circuit for an electric toothbrush according to claim 7, wherein The loop compensation circuit comprises a fifth resistor, a twelfth capacitor and a thirteenth capacitor, which are connected in sequence and end to end, the fifth resistor and the twelfth capacitor being connected to the error amplifier output pin respectively, and the twelfth capacitor and the thirteenth capacitor being connected to the ground wire respectively.

9. The power supply circuit for an electric toothbrush according to claim 1, wherein The boost chip is an SGM6611C chip.

10. An electric toothbrush characterized by comprising: A power supply circuit of an electric toothbrush comprising any one of claims 1 to 9.

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