Motor constant voltage control circuit and shaver

Abstract

The utility model relates to a motor constant voltage control circuit and a shaver. The control circuit comprises a switching circuit which is used for controlling the main controller to operate or stop operating based on the opening signal or the closing signal; the motor voltage detection circuit is used for being switched on when the low level issued by the main controller is received, and is switched off when the high level issued by the main controller is received; the main controller is used for issuing the initial square wave to the motor voltage detection circuit, obtaining the positive voltage and the negative voltage of the motor when the motor voltage detection circuit is switched on, obtaining a motor voltage difference by making a difference between the positive voltage and the negative voltage, reducing the low level in the initial square wave according to a preset down-regulation voltage if the motor voltage difference is greater than a pre-stored rated voltage of the motor, and otherwise, outputting the initial square wave according to the preset down-regulation voltage. If yes, the low level in the initial square wave is increased according to the preset up-regulation voltage until the obtained motor voltage difference is equal to the motor rated voltage. The voltage across the two ends of the motor can be kept under the rated voltage of the motor, and the constant rotating speed of the motor is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of shavers, in particular to a motor constant voltage control circuit and a shaver. Background Art

[0002] In the prior art, shavers use internal batteries to provide shaving power. The battery status within the shaver changes from a charged state to a depleted state as the shaver is used. That is, as the battery within the shaver changes from a charged state to a depleted state, the battery voltage remains within a certain range. When the battery voltage is low, the motor within the shaver cannot maintain its rated voltage. Consequently, when the battery voltage within the shaver cannot maintain the rated voltage and power is insufficient, the motor within the shaver will be underpowered and its speed will decrease, resulting in beard pinching and an incomplete shave when the consumer uses the shaver. Utility Model Content

[0003] Based on this, it is necessary to provide a motor constant voltage control circuit and a shaver to address the above technical problems.

[0004] In a first aspect, a motor constant voltage control circuit is provided, the control circuit comprising a main controller, a switch circuit, a power supply circuit and a motor voltage detection circuit; wherein,

[0005] The main controller is respectively connected to the switch circuit, the power supply circuit and the motor voltage detection circuit;

[0006] The switch circuit is used to control the main controller to operate or stop operating based on a user's on signal or off signal;

[0007] The power supply circuit is used to supply power to the main controller;

[0008] The motor voltage detection circuit is configured to be turned on when receiving a low level signal from the main controller to control the operation of the motor in the motor voltage detection circuit, and to be turned off when receiving a high level signal from the main controller to stop the motor;

[0009] The main controller is used to send an initial square wave to the motor voltage detection circuit, obtain the positive voltage and negative voltage of the motor when the motor voltage detection circuit is turned on, and obtain the motor voltage difference based on the difference between the positive voltage and the negative voltage. If the motor voltage difference is greater than the pre-stored motor rated voltage, the low level in the initial square wave is lowered according to the preset downward voltage. If the motor voltage difference is less than the motor rated voltage, the low level in the initial square wave is increased according to the preset upward voltage until the obtained motor voltage difference is equal to the motor rated voltage.

[0010] As an alternative implementation, the motor voltage detection circuit further includes a discharge protection circuit, a positive voltage reading circuit, an absorption circuit, and a negative voltage reading circuit;

[0011] The discharge protection circuit is respectively connected to the main controller and the positive voltage reading circuit;

[0012] The positive voltage reading circuit is respectively connected to the main controller and the absorption circuit;

[0013] The negative voltage reading circuit is respectively connected to the main controller and the absorption circuit;

[0014] The discharge protection circuit is configured to be in an open circuit state when the low level sent by the main controller exceeds a first preset voltage threshold, so as to protect the motor;

[0015] The positive voltage reading circuit is configured to read the positive voltage of the motor when it is turned on, and send the positive voltage to the main controller;

[0016] The absorption circuit is configured to absorb the low level when the low level sent by the main control exceeds a second preset voltage threshold;

[0017] The negative voltage reading circuit is configured to read the negative voltage of the motor when it is turned on, and send the negative voltage to the main controller.

[0018] As an alternative implementation, the discharge protection circuit includes a first resistor, a MOS transistor, and a second resistor;

[0019] One end of the first resistor is connected to the S pole of the MOS transistor, the other end of the first resistor is respectively connected to the G pole of the MOS transistor and one end of the second resistor, the D pole of the MOS transistor is connected to the positive voltage reading circuit, and the other end of the second resistor is connected to the MOTO pin of the main controller.

[0020] As an alternative implementation, the positive voltage reading circuit includes a first capacitor, a second capacitor, a third capacitor, a third resistor, and a fourth resistor;

[0021] The positive electrode of the first capacitor is respectively connected to the discharge protection circuit, the positive electrode of the second capacitor, one end of the third resistor, and the absorption circuit, the negative electrode of the first capacitor is respectively connected to the negative electrode of the third capacitor and the other end of the fourth resistor, and is grounded, the negative electrode of the second capacitor is grounded, and the other end of the third resistor is connected to the positive electrode of the third capacitor, one end of the fourth resistor, and the I3 pin of the main controller.

[0022] As an alternative embodiment, the absorption circuit includes a motor, a fourth capacitor, and a diode;

[0023] The positive electrode of the motor is respectively connected to the positive voltage reading circuit, the positive electrode of the fourth capacitor, and the negative electrode of the diode, and the negative electrode of the motor is respectively connected to the negative electrode of the fourth capacitor, the positive electrode of the diode, and the negative voltage reading circuit.

[0024] As an alternative embodiment, the negative voltage reading circuit includes a fifth capacitor, a fifth resistor, and a sixth resistor;

[0025] One end of the fifth resistor is respectively connected to the absorption circuit and one end of the sixth resistor, the other end of the fifth resistor is connected to the negative electrode of the fifth capacitor and grounded, and the other end of the sixth resistor is respectively connected to the I2 pin of the main controller and the positive electrode of the fifth capacitor.

[0026] As an alternative embodiment, the switch circuit includes a toggle switch and a sixth capacitor;

[0027] The KEY network terminal of the toggle switch is respectively connected to the KEY1 pin of the main controller and the positive electrode of the sixth capacitor, and the negative electrode of the sixth capacitor is connected to the SW terminal of the toggle switch and grounded.

[0028] As an alternative embodiment, the power supply circuit includes a power supply, a seventh resistor, a seventh capacitor, and an eighth capacitor;

[0029] The power supply is connected to one end of the seventh resistor, the other end of the seventh resistor is respectively connected to the positive electrode of the seventh capacitor, the positive electrode of the eighth capacitor, and the main controller, and the negative electrode of the seventh capacitor is respectively connected to the negative electrode of the eighth capacitor and the main controller, and is grounded.

[0030] In a second aspect, a razor is provided, characterized in that the razor includes the control circuit as described in the first aspect.

[0031] The present invention provides a control circuit and a razor for constant voltage of a motor. The technical solutions provided by the embodiments of the present invention at least bring the following beneficial effects: After the main controller reads the positive voltage and negative voltage of the motor, by processing the positive voltage and negative voltage, the difference between the positive voltage and negative voltage is obtained to get the motor voltage difference. Based on the magnitude of the motor voltage difference and the rated voltage of the motor, the main controller continuously adjusts the electrical signal sent to the motor voltage detection circuit, so that the motor always operates at the rated voltage of constant voltage and maintains a stable rotational speed. In this way, the voltage across the motor is kept constant at the rated voltage of the motor, maintaining a stable rotational speed of the motor, solving the problem of insufficient power of the razor, improving the consumer experience, and avoiding phenomena such as beard clamping and incomplete shaving.

[0032] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of a control circuit for constant voltage of a motor provided by an embodiment of the present utility model;

[0035] Figure 2 It is a schematic structural diagram of a motor voltage detection circuit provided by an embodiment of the present utility model;

[0036] Figure 3 It is a schematic structural diagram of a switch circuit provided by an embodiment of the present utility model;

[0037] Figure 4 It is a schematic structural diagram of a main controller and a power supply circuit provided by an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, the following further details the present utility model in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present utility model.

[0039] Figure 1 It is a schematic structural diagram of a control circuit for constant voltage of a motor provided by an embodiment of the present utility model. As Figure 1 shown, the control circuit includes a main controller 101, a switch circuit 102, a power supply circuit 103 and a motor voltage detection circuit 104.

[0040] The main controller 101 is respectively connected to the switch circuit 102, the power supply circuit 103 and the motor voltage detection circuit 104.

[0041] The switch circuit 102 is used to control the operation or stop of the main controller 101 based on the user's on signal or off signal.

[0042] The power supply circuit 103 is used to supply power to the main controller 101.

[0043] The motor voltage detection circuit 104 is used to conduct when receiving a low level sent by the main controller 101 to control the operation of the motor in the motor voltage detection circuit 104, and to disconnect when receiving a high level sent by the main controller 101 to stop the motor from running.

[0044] The main controller 101 is used to send an initial square wave to the motor voltage detection circuit 104. When the motor voltage detection circuit 104 is conducting, it acquires the positive voltage and negative voltage of the motor, and obtains the motor voltage difference by taking the difference between the positive voltage and the negative voltage. If the motor voltage difference is greater than the pre-stored rated voltage of the motor, it reduces the low level in the initial square wave according to a preset voltage reduction. If the motor voltage difference is less than the rated voltage of the motor, it increases the low level in the initial square wave according to a preset voltage increase until the obtained motor voltage difference is equal to the rated voltage of the motor. In this way, after the motor starts running, the main controller 101 reads the positive voltage and negative voltage of the motor, processes the positive voltage and negative voltage, takes the difference between the positive voltage and the negative voltage to obtain the motor voltage difference, and based on the magnitude of the motor voltage difference and the rated voltage of the motor, the main controller 101 continuously adjusts the electrical signal sent to the motor voltage detection circuit 104 through the MOTO pin, so that the motor always operates at the rated voltage of constant voltage and maintains a stable rotation speed.

[0045] As Figure 1 shown, the motor voltage detection circuit 104 further includes a discharge protection circuit 1041, a positive voltage reading circuit 1042, an absorption circuit 1043, and a negative voltage reading circuit 1044.

[0046] The discharge protection circuit 1041 is respectively connected to the main controller 101 and the positive voltage reading circuit 1042.

[0047] The positive voltage reading circuit 1042 is respectively connected to the main controller 101 and the absorption circuit 1043.

[0048] The negative voltage reading circuit 1044 is respectively connected to the main controller 101 and the absorption circuit 1043.

[0049] The discharge protection circuit 1041 is used to be in an open circuit state when the low level sent by the main controller 101 exceeds the first preset voltage threshold to protect the motor.

[0050] The positive voltage reading circuit 1042 is used to read the positive voltage of the motor when conducting and send the positive voltage to the main controller 101.

[0051] The absorption circuit 1043 is used to absorb the low level when the low level sent by the main controller 101 exceeds the second preset voltage threshold.

[0052] The negative terminal voltage reading circuit 1044 is used to read the negative terminal voltage of the motor and send the negative terminal voltage to the main controller 101 when it is turned on.

[0053] Figure 2 FIG. 4 is a schematic structural diagram of a motor voltage detection circuit provided by an embodiment of the present invention. The discharge protection circuit 1041 includes a first resistor R1, a MOS transistor M3, and a second resistor R2.

[0054] One end of the first resistor R1 is connected to the S pole of the MOS transistor M3. The other end of the first resistor R1 is respectively connected to the G pole of the MOS transistor M3 and one end of the second resistor R2. The D pole of the MOS transistor M3 is connected to the positive terminal voltage reading circuit 1042. The other end of the second resistor R2 is connected to the MOTO pin of the main controller 101. When the G pole of the MOS transistor M3 is at a low level, the MOS transistor M3 will be turned on. In this way, the influence of the electrical signal sent by the main controller 101 on the motor voltage of the motor M can be limited by the on and off of the MOS transistor M3, playing a protective role for the motor M.

[0055] As an optional implementation manner, the positive terminal voltage reading circuit 1042 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a third resistor R3, and a fourth resistor R4.

[0056] The positive pole of the first capacitor C1 is respectively connected to the discharge protection circuit 1041, the positive pole of the second capacitor C2, one end of the third resistor R3, and the absorption circuit 1043. The negative pole of the first capacitor C1 is respectively connected to the negative pole of the third capacitor C3 and the other end of the fourth resistor R4 and is grounded. The negative pole of the second capacitor C2 is grounded. The other end of the third resistor R3 is connected to the positive pole of the third capacitor C3, one end of the fourth resistor R4, and the I3 pin of the main controller 101.

[0057] As an optional implementation manner, the absorption circuit 1043 includes a motor M, a fourth capacitor C4, and a diode D.

[0058] The positive pole of the motor M is respectively connected to the positive terminal voltage reading circuit 1042, the positive pole of the fourth capacitor C4, and the negative pole of the diode D. The negative pole of the motor M is respectively connected to the negative pole of the fourth capacitor C4, the positive pole of the diode D, and the negative terminal voltage reading circuit 1044.

[0059] As an optional implementation manner, the negative terminal voltage reading circuit 1044 includes a fifth capacitor C5, a fifth resistor R5, and a sixth resistor R6.

[0060] One end of the fifth resistor R5 is respectively connected to the absorption circuit 1043 and one end of the sixth resistor R6. The other end of the fifth resistor R5 is connected to the negative pole of the fifth capacitor C5 and is grounded. The other end of the sixth resistor R6 is respectively connected to the I2 pin of the main controller 101 and the positive pole of the fifth capacitor C5.

[0061] Figure 3 The figure is a schematic structural diagram of a switch circuit provided by an embodiment of the present utility model. The switch circuit 102 includes a toggle switch and a sixth capacitor C6.

[0062] The KEY network terminal of the toggle switch is respectively connected to the KEY1 pin of the main controller 101 and the positive electrode of the sixth capacitor C6. The negative electrode of the sixth capacitor C6 is connected to the SW terminal of the toggle switch and grounded. When the user toggles the switch to the SW position, the toggle switch is in the on state. When the user toggles the switch to the NC position, the toggle switch is in the off state. Only when the toggle switch is in the on state, the entire motor constant voltage control circuit is in the conducting state and the motor runs. If the toggle switch is in the off state, the entire motor constant voltage control circuit is in the open circuit state and the motor does not run.

[0063] Figure 4 The figure is a schematic structural diagram of a main controller and a power supply circuit provided by an embodiment of the present utility model. The power supply circuit 103 includes a power supply VBAT, a seventh resistor R7, a seventh capacitor C7, and an eighth capacitor C8.

[0064] The power supply VBAT is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is respectively connected to the positive electrode of the seventh capacitor C7, the positive electrode of the eighth capacitor C8, and the main controller 101. The negative electrode of the seventh capacitor C7 is respectively connected to the negative electrode of the eighth capacitor C8 and the main controller 101 and grounded.

[0065] Furthermore, the present application discloses a razor, which includes the motor constant voltage control circuit introduced above Figure 2 and will not be elaborated here. In this way, the voltage across the motor is kept constant at the rated voltage of the motor, maintaining a stable rotational speed of the motor, solving the problem of insufficient power, improving the consumer experience, and avoiding problems such as beard pinching and unclean shaving. Keeping the voltage across the motor constant at the rated voltage of the motor maintains a stable rotational speed of the motor, achieving the effect of constant-speed shaving.

[0066] An embodiment of the present utility model provides a motor constant voltage control circuit and a razor. After the main controller reads the positive voltage and negative voltage of the motor, by processing the positive voltage and negative voltage, the difference between the positive voltage and negative voltage is obtained to get the motor voltage difference. Based on the magnitude of the motor voltage difference and the rated voltage of the motor, the main controller continuously adjusts the electrical signal sent to the motor voltage detection circuit, so that the motor always operates at the rated voltage of constant voltage, maintaining a stable rotational speed. In this way, the voltage across the motor is kept constant at the rated voltage of the motor, maintaining a stable rotational speed of the motor, solving the problem of insufficient power, improving the consumer experience, and avoiding phenomena such as beard pinching and unclean shaving.

[0067] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention can include non-volatile and / or volatile memories. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0068] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0069] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in the present invention are all information and data authorized by the user or fully authorized by all parties.

[0070] Each embodiment in this specification is described in a relevant manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for system embodiments, since they are basically similar to method embodiments, the description is relatively simple, and reference can be made to the corresponding parts of the method embodiments for the relevant content.

[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0072] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A control circuit for constant voltage of a motor, characterized in that, The control circuit includes a main controller, a switch circuit, a power supply circuit, and a motor voltage detection circuit; wherein, the main controller is respectively connected to the switch circuit, the power supply circuit, and the motor voltage detection circuit; the switch circuit is configured to control the operation or stop of the main controller based on an on signal or an off signal of a user; the power supply circuit is configured to supply power to the main controller; the motor voltage detection circuit is configured to conduct when receiving a low level sent by the main controller to control the operation of the motor in the motor voltage detection circuit, and to disconnect when receiving a high level sent by the main controller to stop the motor; the main controller is configured to send an initial square wave to the motor voltage detection circuit, obtain the positive voltage and negative voltage of the motor when the motor voltage detection circuit conducts, and obtain a motor voltage difference by taking the difference between the positive voltage and the negative voltage. If the motor voltage difference is greater than a pre-stored rated motor voltage, the low level in the initial square wave is reduced according to a preset down-regulation voltage. If the motor voltage difference is less than the rated motor voltage, the low level in the initial square wave is increased according to a preset up-regulation voltage until the obtained motor voltage difference is equal to the rated motor voltage.

2. The control circuit according to claim 1, characterized in that The motor voltage detection circuit further includes a discharge protection circuit, a positive voltage reading circuit, an absorption circuit, and a negative voltage reading circuit; the discharge protection circuit is respectively connected to the main controller and the positive voltage reading circuit; the positive voltage reading circuit is respectively connected to the main controller and the absorption circuit; the negative voltage reading circuit is respectively connected to the main controller and the absorption circuit; the discharge protection circuit is configured to be in an open circuit state when the low level sent by the main controller exceeds a first preset voltage threshold to protect the motor; the positive voltage reading circuit is configured to read the positive voltage of the motor and send the positive voltage to the main controller when conducting; the absorption circuit is configured to absorb the low level when the low level sent by the main control exceeds a second preset voltage threshold; the negative voltage reading circuit is configured to read the negative voltage of the motor and send the negative voltage to the main controller when conducting.

3. The control circuit according to claim 2, characterized in that, The discharge protection circuit includes a first resistor, a MOS transistor, and a second resistor; one end of the first resistor is connected to the S pole of the MOS transistor, the other end of the first resistor is respectively connected to the G pole of the MOS transistor and one end of the second resistor, the D pole of the MOS transistor is connected to the positive voltage reading circuit, and the other end of the second resistor is connected to the MOTO pin of the main controller.

4. The control circuit according to claim 2, characterized in that, The positive voltage reading circuit includes a first capacitor, a second capacitor, a third capacitor, a third resistor, and a fourth resistor; The positive electrode of the first capacitor is respectively connected to the discharge protection circuit, the positive electrode of the second capacitor, one end of the third resistor, and the absorption circuit. The negative electrode of the first capacitor is respectively connected to the negative electrode of the third capacitor and the other end of the fourth resistor, and is grounded. The negative electrode of the second capacitor is grounded. The other end of the third resistor is connected to the positive electrode of the third capacitor, one end of the fourth resistor, and the I3 pin of the main controller.

5. The control circuit according to claim 2, wherein The absorption circuit includes a motor, a fourth capacitor, and a diode; The positive electrode of the motor is respectively connected to the positive voltage reading circuit, the positive electrode of the fourth capacitor, and the negative electrode of the diode. The negative electrode of the motor is respectively connected to the negative electrode of the fourth capacitor, the positive electrode of the diode, and the negative voltage reading circuit.

6. The control circuit according to claim 2, characterized in that The negative voltage reading circuit includes a fifth capacitor, a fifth resistor, and a sixth resistor; One end of the fifth resistor is respectively connected to the absorption circuit and one end of the sixth resistor. The other end of the fifth resistor is connected to the negative electrode of the fifth capacitor and is grounded. The other end of the sixth resistor is respectively connected to the I2 pin of the main controller and the positive electrode of the fifth capacitor.

7. The control circuit according to claim 1, characterized in that, The switch circuit includes a toggle switch and a sixth capacitor; The KEY network terminal of the toggle switch is respectively connected to the KEY1 pin of the main controller and the positive electrode of the sixth capacitor. The negative electrode of the sixth capacitor is connected to the SW terminal of the toggle switch and is grounded.

8. The control circuit according to claim 1, wherein The power supply circuit includes a power supply, a seventh resistor, a seventh capacitor, and an eighth capacitor; The power supply is connected to one end of the seventh resistor. The other end of the seventh resistor is respectively connected to the positive electrode of the seventh capacitor, the positive electrode of the eighth capacitor, and the main controller. The negative electrode of the seventh capacitor is respectively connected to the negative electrode of the eighth capacitor and the main controller, and is grounded.

9. A razor, characterized in that, The razor includes the control circuit according to any one of claims 1 to 8.

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