Control circuit of electric breast pump

Abstract

The utility model relates to the technical field of breast pumps, in particular to a control circuit of an electric breast pump, which is characterized in that a power supply end of a battery power supply circuit and a control end of a breast pumping control circuit are electrically connected with a microcontroller; the charging end of the battery power supply circuit is electrically connected with the output end of the charging circuit, the input end of the charging circuit is electrically connected with the output end of the adapter connecting circuit, and the charging self-adaptive circuit is electrically connected between the self-adaptive end and the charging end of the charging circuit; the charging self-adaptive circuit is used for setting the charging voltage of the charging circuit as the voltage of the adapter connected with the adapter connecting circuit; the pressure detection circuit is electrically connected with the microcontroller, and a pressure sensor U10 of the pressure detection circuit is arranged in a suction device connected with the milk suction control circuit; when the microcontroller detects that the pressure in the suction device is increased through the pressure detection circuit, the microcontroller controls the milk suction control circuit to downshift; the problem that an existing electric breast pump control circuit cannot achieve automatic downshift and the adapter compatibility problem are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of breast pumps, in particular to a control circuit for an electric breast pump. Background Art

[0002] As an important part of modern mother and baby products, electric breast pumps have won wide attention and application with their high efficiency and convenience. However, in the prior art, there are still some problems that need to be solved urgently in the control circuit of electric breast pumps.

[0003] First of all, the fast charging function of existing electric breast pumps often can only be adapted to adapters with specified voltages and cannot be compatible with adapters with various voltages such as 5V, 9V, and 12V; this limitation not only restricts the charging options of users, but also may cause compatibility problems for users when replacing adapters. With the continuous development of fast charging technology, more and more electronic devices begin to support adapters with multiple voltages to achieve a wider and more convenient charging method. Therefore, upgrading the fast charging function of electric breast pumps to be compatible with adapters with multiple voltages to improve the charging flexibility and convenience has become another important direction in the current design of the control circuit of electric breast pumps.

[0004] Secondly, when existing electric breast pumps are not in use or are leaking air, their internal circuits often cannot automatically downshift, and their batteries or external power supplies will still maintain a certain voltage output, which will not only cause unnecessary power consumption, but also may cause potential damage to the components in the circuit; especially in the case of long-term standby, the waste of battery power and the aging problem of circuit components are particularly prominent. Therefore, designing a control circuit for an electric breast pump that can automatically downshift to reduce standby power consumption, extend the battery life and the service time of circuit components has become a technical problem that needs to be solved urgently at present.

[0005] In summary, there are obvious technical defects in the existing control circuit of electric breast pumps in terms of automatic downshifting and adapter compatibility. In view of these problems, it is urgent to improve the control circuit of electric breast pumps, aiming to solve the deficiencies in the prior art through innovative design solutions and improve the performance and user experience of electric breast pumps. Summary of the Utility Model

[0006] Aiming at the above defects, the purpose of the utility model is to provide a control circuit for an electric breast pump, which solves the problems of inability to automatically downshift and adapter compatibility of the existing control circuit of electric breast pumps.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] An electric breast pump control circuit includes a microcontroller, a battery power supply circuit, an adapter connection circuit, and at least one breast milk pumping control circuit; the power supply terminal of the battery power supply circuit and the control terminal of the breast milk pumping control circuit are both electrically connected to the microcontroller; it further includes a charging circuit, a pressure detection circuit, and a charging adaptive circuit; the charging terminal of the battery power supply circuit is electrically connected to the output terminal of the charging circuit, the input terminal of the charging circuit is electrically connected to the output terminal of the adapter connection circuit, and the charging adaptive circuit is electrically connected between the adaptive terminal and the charging terminal of the charging circuit;

[0009] The charging adaptive circuit is used to set the charging voltage of the charging circuit to the voltage of the adapter connected to the adapter connection circuit;

[0010] The pressure detection circuit is electrically connected to the microcontroller, and the pressure sensor U10 of the pressure detection circuit is arranged in the suction device connected to the breast milk pumping control circuit;

[0011] When the microcontroller detects that the pressure in the suction device becomes larger through the pressure detection circuit, the microcontroller controls the breast milk pumping control circuit to downshift.

[0012] Furthermore, it further includes a power-on reset detection circuit, and the power-on reset detection circuit is electrically connected between the pressure sensor U and the microcontroller;

[0013] The microcontroller detects whether the power supply is stable after the pressure detection circuit is powered on again through the power-on reset detection circuit, and the microcontroller receives the signal of the pressure detection circuit only when the power supply is stable.

[0014] Furthermore, the charging adaptive circuit includes at least one adaptive voltage module, each adaptive voltage module corresponds to a voltage level, and all the adaptive voltage modules are electrically connected between the adaptive terminal and the charging terminal of the charging circuit;

[0015] According to the voltage of the adapter connected to the adapter connection circuit, the adaptive voltage module corresponding to the voltage level is turned on.

[0016] Furthermore, the adaptive voltage module includes a resistor R38, a MOS transistor Q6, a resistor R87, a resistor R37, and a zener diode ZD1; the drain of the MOS transistor Q6 is connected in series with the resistor R38 and then electrically connected to the adaptive terminal of the charging circuit, the source of the MOS transistor Q6 is grounded, the cathode of the zener diode ZD1 is electrically connected to the charging terminal of the charging circuit, the anode of the zener diode ZD1 is connected in series with the resistor R37 and then grounded, and the gate of the MOS transistor Q6 is connected in series with the resistor R87 and then electrically connected between the zener diode ZD1 and the resistor R37.

[0017] Further, the charging circuit includes a buck-boost charging chip U5, a resistor R40, a resistor R41, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C29; the VSEN terminal and the VIN terminal of the buck-boost charging chip U5 are used as an adaptive terminal and a charging terminal respectively;

[0018] One end of the resistor R40, one end of the resistor R41, and one end of the capacitor C29 are all electrically connected to the VSEN terminal of the buck-boost charging chip U5, the other end of the resistor R40 and the other end of the capacitor C29 are both grounded, the other end of the resistor R41, one end of the capacitor C23, one end of the capacitor C24, and one end of the capacitor C25 are all electrically connected to the VIN terminal of the buck-boost charging chip U5, and the other ends of the capacitor C23, the capacitor C24, and the capacitor C25 are all grounded.

[0019] Further, the power-on detection circuit includes a MOS transistor Q12, a resistor R100, and a resistor R101; the drain of the MOS transistor Q12 is electrically connected to the GND terminal of the pressure sensor U10, the gate of the MOS transistor Q12 is serially connected with the resistor R100 and then connected to the microcontroller 1, the source of the MOS transistor Q12 is grounded, and the resistor R101 is connected in parallel between the gate and the source of the MOS transistor Q12.

[0020] Further, the pressure detection circuit further includes a capacitor C58, a capacitor C61, a resistor R78, a resistor R79, a resistor R828, and a resistor R85; the VDD terminal of the pressure sensor U10 is connected to a 3.3V power supply, the GND terminal of the pressure sensor U10 is connected to SGND1, the capacitor C58 and the capacitor C61 are both connected in parallel between the VDD terminal and the GND terminal of the pressure sensor U10, the SDA terminal and the SCL terminal of the pressure sensor U10 are serially connected with the resistor R82 and the resistor R85 respectively and then connected to the microcontroller, one end of the resistor R78 is connected to the 3.3V power supply, the other end of the resistor R78 is electrically connected between the resistor R82 and the microcontroller, one end of the resistor R79 is connected to the 3.3V power supply, and the other end of the resistor R79 is electrically connected between the resistor R82 and the microcontroller.

[0021] Further, the pressure sensor U10 is a gauge pressure sensor.

[0022] The technical solution provided by the present utility model may include the following beneficial effects: Based on the framework of the existing electric breast pump control circuit, a charging adaptive circuit is electrically connected between the adaptive end and the charging end of the charging circuit, which is used to detect the voltage of the adapter connected to the adapter connection circuit (such as 5V, 9V, 12V, etc.), and set the charging voltage of the charging circuit to the voltage of the connected adapter, so that the charging current output by the charging circuit to the battery power supply circuit will not be too large, pulling down the adapter and causing damage to the adapter, thereby making the electric breast pump compatible with adapters of various voltage levels.

[0023] More importantly, a pressure detection circuit 7 is also added and electrically connected to the microcontroller 1. The pressure sensor U10 of the pressure detection circuit is arranged in the suction device connected to the milk suction control circuit (for example, if the suction device is a breast shield with an air tube, the pressure sensor U10 is arranged in the air tube). The microcontroller can detect the pressure change in the suction device through the pressure detection circuit. When the pressure increases (because it is generally negative pressure during milk suction, if there is air leakage or it is not in use, it will be connected to the atmosphere, thus causing the pressure to increase to the same as the atmospheric pressure), the microcontroller controls the milk suction control circuit to downshift so that the connected suction device operates in a downshift mode, reducing unnecessary power consumption and avoiding aging of circuit components. Among them, the downshift of the suction device can be a gradient downshift for quick upshift to the corresponding gear when used again, or a rapid downshift. Any downshift form is within the defined range. Description of the Drawings

[0024] Figure 1 is the circuit schematic diagram of an electric breast pump control circuit of one embodiment of the present utility model.

[0025] Figure 2 is as Figure 1 shown in the circuit diagram of the charging adaptive circuit.

[0026] Figure 3 is as Figure 1 shown in the circuit diagram of the charging circuit.

[0027] Figure 4 is as Figure 1 shown in the circuit diagram of the re-power-on detection circuit.

[0028] Figure 5 is as Figure 1 shown in the circuit diagram of the pressure detection circuit.

[0029] Wherein: microcontroller 1, battery power supply circuit 2, adapter connection circuit 5, milk sucking control circuit 4, charging circuit 3, pressure detection circuit 7, charging adaptive circuit 6, pressure sensor U10, power-on reset detection circuit 8, adaptive voltage module 61, resistor R38, MOS transistor Q6, resistor R87, resistor R37, zener diode ZD1, buck-boost charging chip U5, resistor R40, resistor R41, capacitor C23, capacitor C24, capacitor C25, capacitor C29, MOS transistor Q12, resistor R100, resistor R101, capacitor C58, capacitor C61, resistor R78, resistor R79, resistor R828, resistor R85. Specific embodiments

[0030] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0031] In the description of the embodiments of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more unless otherwise specifically defined.

[0032] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] The following is combined with Figures 1 to 5 to describe an electric breast pump control circuit according to an embodiment of the present invention.

[0034] An electric breast pump control circuit includes a microcontroller 1, a battery power supply circuit 2, an adapter connection circuit 5, and at least one breast milk suction control circuit 4; the power supply end of the battery power supply circuit 2 and the control end of the breast milk suction control circuit 4 are both electrically connected to the microcontroller 1; it further includes a charging circuit 3, a pressure detection circuit 7, and a charging adaptive circuit 6; the charging end of the battery power supply circuit 2 is electrically connected to the output end of the charging circuit 3, the input end of the charging circuit 3 is electrically connected to the output end of the adapter connection circuit 5, and the charging adaptive circuit 6 is electrically connected between the adaptive end and the charging end of the charging circuit 3;

[0035] The charging adaptive circuit 6 is used to set the charging voltage of the charging circuit 3 to the voltage of the adapter connected to the adapter connection circuit 5;

[0036] The pressure detection circuit 7 is electrically connected to the microcontroller 1, and the pressure sensor U10 of the pressure detection circuit 7 is arranged in the suction device connected to the breast milk suction control circuit 4;

[0037] When the microcontroller 1 detects an increase in the pressure in the suction device through the pressure detection circuit 7, the microcontroller 1 controls the breast milk suction control circuit 4 to downshift.

[0038] In a preferred embodiment of the electric breast pump control circuit proposed by the present utility model, as Figure 1 shown, based on the framework of the existing electric breast pump control circuit, the charging adaptive circuit 6 is electrically connected between the adaptive end and the charging end of the charging circuit 3, used to detect the voltage of the adapter connected to the adapter connection circuit 5 (such as 5V, 9V, 12V, etc.), and set the charging voltage of the charging circuit 3 to the voltage of the connected adapter, so that the charging current from the output end of the charging circuit 3 (such as Figure 1 BAT in) to the battery power supply circuit 2 will not be too large, pulling down the adapter and causing the adapter to be damaged, thereby making the electric breast pump compatible with adapters of various voltage levels.

[0039] More importantly, a pressure detection circuit 7 is additionally provided and electrically connected to a microcontroller 1 (such as an MCU). The pressure sensor U10 of the pressure detection circuit 7 is arranged inside the suction device connected to the milk suction control circuit 4 (for example, if the suction device is a breast shield with an air tube, the pressure sensor U10 is arranged in the air tube). The microcontroller 1 can detect the pressure change inside the suction device through the pressure detection circuit 7. When the pressure increases (because it is generally negative pressure during milk suction, if there is air leakage or it is not in use, it will be connected to the atmosphere, thus causing the pressure to increase to the same as the atmospheric pressure), the microcontroller 1 controls the milk suction control circuit 4 to downshift so that the connected suction device operates in a downshift mode, reducing unnecessary power consumption and avoiding the aging of circuit components. The downshift of the suction device can be a gradient downshift to quickly increase to the corresponding gear when used again, or a rapid downshift. Any downshift form is within the defined range. It should be noted that the switch and gear control of the suction device are usually controlled by the solenoid valve control circuit and the vacuum pump control circuit in the milk suction control circuit 4, which are all prior arts and will not be elaborated here.

[0040] Furthermore, a power-on reset detection circuit 8 is included. The power-on reset detection circuit 8 is electrically connected between the pressure sensor U10 and the microcontroller 1;

[0041] The microcontroller 1 detects whether the power supply of the pressure detection circuit 7 is stable after a power-on reset through the power-on reset detection circuit 8. Only when the power supply is stable does the microcontroller 1 receive the signal of the pressure detection circuit 7.

[0042] In this embodiment, after the pressure detection circuit 7 is added to the electric breast pump, when the pressure detection circuit 7 is powered on again, voltage fluctuations will occur, resulting in abnormal signals received by the microcontroller 1 from the pressure detection circuit 7. To improve the stability of the pressure detection circuit 7, a power-on reset detection circuit 8 is electrically connected between the pressure sensor U10 and the microcontroller 1, as Figure 1 shown. The power-on reset detection circuit 8 detects whether the power supply of the pressure detection circuit 7 is stable after a power-on reset (because unstable voltage will occur in the pressure sensor U10), and only when the power supply is stable does the microcontroller 1 receive the signal of the pressure detection circuit 7.

[0043] Furthermore, the charging adaptive circuit 6 includes at least one adaptive voltage module 61. Each adaptive voltage module 61 corresponds to a voltage level, and all adaptive voltage modules 61 are electrically connected between the adaptive end and the charging end of the charging circuit 3;

[0044] According to the voltage of the adapter connected by the adapter connection circuit 5, the adaptive voltage module 61 corresponding to the voltage level is turned on.

[0045] In this embodiment, as Figure 2As shown, the charging adaptive circuit 6 is electrically connected between the adaptive end and the charging end of the charging circuit 3 through multiple adaptive voltage modules 61 with different voltage levels, so that the voltage of the charging circuit 3 is self-adapted to the voltage of the adapter connected to the adapter connection circuit 5.

[0046] Further, the adaptive voltage module 61 includes a resistor R38, a MOS transistor Q6, a resistor R87, a resistor R37, and a zener diode ZD1; the drain of the MOS transistor Q6 is connected in series with the resistor R38 and then electrically connected to the adaptive end of the charging circuit 3, the source of the MOS transistor Q6 is grounded, the cathode of the zener diode ZD1 is electrically connected to the charging end of the charging circuit 3, the anode of the zener diode ZD1 is grounded after being connected in series with the resistor R37, and the gate of the MOS transistor Q6 is electrically connected between the zener diode ZD1 and the resistor R37 after being connected in series with the resistor R87.

[0047] In this embodiment, the adaptive voltage module 61 is composed of a resistor R38, a MOS transistor Q6, a resistor R87, a resistor R37, and a zener diode ZD1. The voltage level of the adaptive voltage module 61 is mainly obtained by selecting different specifications of the zener diode ZD1. The MOS transistor Q6 is used to conduct when the adapter voltage (DC-V) transmitted by the adapter connection circuit 5 is the voltage level voltage of the adaptive voltage module 61, and is clamped at the corresponding voltage level by using the zener diode ZD1. For example, when the zener diode ZD1 = 5.6V (the regulated voltage value can be within the range greater than 5V and less than 9V, meeting the 9V adapter and the turn-on voltage of the MOS transistor Q6), the voltage level of the adaptive voltage module 61 is 9V; when the zener diode ZD1 = 10V (the regulated voltage value can be within the range greater than 9V and less than 12V, meeting the 12V adapter and the turn-on voltage of the MOS transistor Q6), the voltage level of the adaptive voltage module 61 is 12V.

[0048] Further, the charging circuit 3 includes a buck-boost charging chip U5, a resistor R40, a resistor R41, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C29; the VSEN terminal and the VIN terminal of the buck-boost charging chip U5 are used as the adaptive end and the charging end respectively;

[0049] One end of the resistor R40, one end of the resistor R41, and one end of the capacitor C29 are all electrically connected to the VSEN terminal of the buck-boost charging chip U5, the other end of the resistor R40 and the other end of the capacitor C29 are both grounded, the other end of the resistor R41, one end of the capacitor C23, one end of the capacitor C24, and one end of the capacitor C25 are all electrically connected to the VIN terminal of the buck-boost charging chip U5, and the other end of the capacitor C23, the other end of the capacitor C24, and the other end of the capacitor C25 are all grounded.

[0050] In this embodiment, as Figure 3As shown, the charging circuit 3 is centered around the buck-boost charging chip U5 (such as IU5180C). Its VSEN terminal can adapt the buck-boost charging chip U5 to output a charging current (output from the BAT terminal) according to the input voltage. When the adaptation voltage module 61 does not have a corresponding voltage level and is not conducting, at this time, the adapter voltage may be relatively small (such as 5V), and the voltage is divided by the resistor R40 and the resistor R41 and input to the VSEN terminal of the buck-boost charging chip U5, and the buck-boost charging chip U5 can then adapt to this voltage.

[0051] Further, the re-power-on detection circuit 8 includes the MOS transistor Q12, the resistor R100, and the resistor R101. The drain of the MOS transistor Q12 is electrically connected to the GND terminal of the pressure sensor U10. The gate of the MOS transistor Q12 is connected to the microcontroller 1 in series with the resistor R100. The source of the MOS transistor Q12 is grounded, and the resistor R101 is connected in parallel between the gate and the source of the MOS transistor Q12.

[0052] In this embodiment, as Figure 4 shown, the re-power-on detection circuit 8 mainly consists of the MOS transistor Q12 to form a switching circuit connecting between the ground and the GND terminal of the pressure sensor U10 (i.e., between GND and SGND1), and can determine the conduction or cut-off of the MOS transistor Q12 according to the voltage fluctuation of the GND terminal of the pressure sensor U10 (i.e., SGND1), and then feedback to the microcontroller 1.

[0053] Further, the pressure detection circuit 7 further includes the capacitor C58, the capacitor C61, the resistor R78, the resistor R79, the resistor R828, and the resistor R85. The VDD terminal of the pressure sensor U10 is connected to the 3.3V power supply. The GND terminal of the pressure sensor U10 is connected to SGND1. The capacitor C58 and the capacitor C61 are both connected in parallel between the VDD terminal and the GND terminal of the pressure sensor U10. The SDA terminal and the SCL terminal of the pressure sensor U10 are respectively connected to the microcontroller 1 in series with the resistor R82 and the resistor R85. One end of the resistor R78 is connected to the 3.3V power supply, and the other end of the resistor R78 is electrically connected between the resistor R82 and the microcontroller 1. One end of the resistor R79 is connected to the 3.3V power supply, and the other end of the resistor R79 is electrically connected between the resistor R82 and the microcontroller 1.

[0054] In this embodiment, as Figure 5 shown, since the pressure detection circuit 7 uses the pressure sensor U10 as a probe, the peripheral circuit of the pressure sensor U10 is built by the capacitor C58, the capacitor C61, the resistor R78, the resistor R79, the resistor R828, and the resistor R85 to realize the communication connection between the pressure sensor U10 and the microcontroller 1.

[0055] Further, the pressure sensor U10 is a gauge pressure type pressure sensor.

[0056] In this embodiment, the gauge pressure type pressure sensor is small in size, inexpensive, has a wide detection pressure range, high precision, strong anti-interference ability in digital communication, and one end of a catheter can be connected to the cylindrical probe of the gauge pressure type pressure sensor, and the other end of the catheter communicates with the trachea inside a suction device (such as a breast pump with an air tube), so that the internal pressure of the suction device can be detected more accurately.

[0057] For other components and operations of an electric breast pump control circuit according to an embodiment of the present invention, those skilled in the art are known, and will not be described in detail here.

[0058] In the description of this specification, the description with reference to terms such as "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An electric breast pump control circuit, comprising a microcontroller, a battery power supply circuit, an adapter connection circuit and at least one milk suction control circuit; the power supply terminal of the battery power supply circuit and the control terminal of the milk suction control circuit are both electrically connected to the microcontroller; characterized in that: It also includes a charging circuit, a pressure detection circuit, and a charging adaptation circuit; the charging terminal of the battery power supply circuit is electrically connected to the output terminal of the charging circuit, the input terminal of the charging circuit is electrically connected to the output terminal of the adapter connection circuit, and the charging adaptation circuit is electrically connected between the adaptation terminal and the charging terminal of the charging circuit; The charging adaptation circuit is used to set the charging voltage of the charging circuit to the voltage of the adapter connected to the adapter connection circuit; The pressure detection circuit is electrically connected to the microcontroller, and the pressure sensor U10 of the pressure detection circuit is arranged in the suction device connected to the milk suction control circuit; When the microcontroller detects an increase in the pressure in the suction device through the pressure detection circuit, the microcontroller controls the milk suction control circuit to downshift.

2. The control circuit of an electric breast pump according to claim 1, characterized in that: It also includes a power-on reset detection circuit, and the power-on reset detection circuit is electrically connected between the pressure sensor U and the microcontroller; The microcontroller detects whether the power supply is stable after the pressure detection circuit is powered on again through the power-on reset detection circuit, and the microcontroller receives the signal of the pressure detection circuit only when the power supply is stable.

3. The control circuit of an electric breast pump according to claim 1, characterized in that: The charging adaptation circuit includes at least one adaptation voltage module, each adaptation voltage module corresponds to a voltage level, and all the adaptation voltage modules are electrically connected between the adaptation terminal and the charging terminal of the charging circuit; According to the voltage of the adapter connected to the adapter connection circuit, the adaptation voltage module corresponding to the voltage level is turned on.

4. The control circuit of an electric breast pump according to claim 3, characterized in that: The adaptation voltage module includes a resistor R38, a MOS transistor Q6, a resistor R87, a resistor R37, and a zener diode ZD1; the drain of the MOS transistor Q6 is connected in series with the resistor R38 and then electrically connected to the adaptation terminal of the charging circuit, the source of the MOS transistor Q6 is grounded, the cathode of the zener diode ZD1 is electrically connected to the charging terminal of the charging circuit, the anode of the zener diode ZD1 is connected in series with the resistor R37 and then grounded, and the gate of the MOS transistor Q6 is connected in series with the resistor R87 and then electrically connected between the zener diode ZD1 and the resistor R37.

5. The control circuit of an electric breast pump according to claim 1, characterized in that: The charging circuit includes a buck-boost charging chip U5, a resistor R40, a resistor R41, a capacitor C23, a capacitor C24, a capacitor C25, and a capacitor C29; the VSEN terminal and the VIN terminal of the buck-boost charging chip U5 are used as the adaptation terminal and the charging terminal respectively; One end of the resistor R40, one end of the resistor R41, and one end of the capacitor C29 are all electrically connected to the VSEN terminal of the buck-boost charging chip U5, the other end of the resistor R40 and the other end of the capacitor C29 are both grounded, the other end of the resistor R41, one end of the capacitor C23, one end of the capacitor C24, and one end of the capacitor C25 are all electrically connected to the VIN terminal of the buck-boost charging chip U5, and the other end of the capacitor C23, the other end of the capacitor C24, and the other end of the capacitor C25 are all grounded.

6. The control circuit of an electric breast pump according to claim 2, characterized in that: The power-on reset detection circuit includes an MOS transistor Q12, a resistor R100, and a resistor R101; the drain of the MOS transistor Q12 is electrically connected to the GND terminal of the pressure sensor U10, the gate of the MOS transistor Q12 is connected to the microcontroller 1 after being serially connected with the resistor R100, the source of the MOS transistor Q12 is grounded, and the resistor R101 is connected in parallel between the gate and the source of the MOS transistor Q12.

7. The control circuit of an electric breast pump according to claim 1, characterized in that: The pressure detection circuit further includes a capacitor C58, a capacitor C61, a resistor R78, a resistor R79, a resistor R828, and a resistor R85; the VDD terminal of the pressure sensor U10 is connected to a 3.3V power supply, the GND terminal of the pressure sensor U10 is connected to SGND1, the capacitor C58 and the capacitor C61 are both connected in parallel between the VDD terminal and the GND terminal of the pressure sensor U10, the SDA terminal and the SCL terminal of the pressure sensor U10 are respectively connected to the microcontroller after being serially connected with the resistor R82 and the resistor R85, one end of the resistor R78 is connected to the 3.3V power supply, the other end of the resistor R78 is electrically connected between the resistor R82 and the microcontroller, one end of the resistor R79 is connected to the 3.3V power supply, and the other end of the resistor R79 is electrically connected between the resistor R82 and the microcontroller.

8. The control circuit of an electric breast pump according to claim 1, wherein: The pressure sensor U10 is a gauge pressure sensor.

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