Power-down slow-falling control circuit and intelligent toilet cover plate

Abstract

The utility model provides a power-down slow falling control circuit and an intelligent closestool cover plate. The power-down slow falling control circuit comprises an MCU, a motor, a diode connected with the positive electrode of the motor, a first switching circuit, a second switching circuit and a third switching circuit. The first switch circuit and the motor form a slow descending loop, and the second switch circuit controls the conduction of the first switch tube during power failure, so that the cover plate and the seat ring can slowly descend during power failure. When the closestool cover is powered on, the MCU controls the third switching circuit to be switched on, so that the second switching circuit is controlled to be switched on, the first switching tube is cut off, the slow descending loop is closed, and the slow descending loop is prevented from affecting opening and closing of the closestool cover in the powered-on state. And meanwhile, the third switching circuit is additionally arranged between the MCU and the second switching circuit, so that the condition that the power supply voltage directly flows back to the MCU to damage the MCU when the second switching circuit is damaged is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent toilets, in particular to a power-off slow-down control circuit and an intelligent toilet cover. Background Art

[0002] With the popularity of smart home products and consumers' increasing demands for quality of life, smart toilets, as an important component of modern bathroom equipment, have become particularly important in terms of user experience. In the design of smart toilets, the automatic opening and closing function of the toilet lid not only provides convenience for users, but also improves the overall comfort of bathroom use. However, in the event of a power outage, the existing smart toilet lid lacks an effective slow-down device. During the closing process, the toilet lid or seat often falls rapidly due to gravity, producing a loud banging sound. This not only affects the user experience, but may also cause certain damage to the toilet lid and seat itself, reducing the product's service life.

[0003] In response to the above problems, the industry has begun to explore the integration of a power-off slow-down function in the motor drive system of the smart toilet lid, so as to achieve a smooth and slow closing of the toilet lid or seat in the event of a power outage. At present, the technical solutions for realizing this function are mainly divided into two categories: (1) a slow-down circuit design based on a single-pole double-throw relay. Although this solution can effectively solve the problem of rapid drop at the moment of power outage, such as the power-off slow-down system for toilet seat and lid and smart toilet in Chinese utility model patent CN213572238U, the cost of the relay itself is relatively high, which increases the manufacturing cost of the product and is not conducive to large-scale market promotion; (2) a slow-down circuit design based on MOS tubes and optocoupler controllers, such as the smart toilet lid slow-down device in Chinese utility model patent CN217883215U. Although the device cost of this solution is relatively low, if the optocoupler is damaged, the Vcc voltage will be directly injected into the microcontroller, causing damage to the microcontroller. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide a power-off slow-down control circuit and a toilet cover, which isolates the microcontroller and the optocoupler through a switch tube, thereby solving the problem of power backflow to the microcontroller when the optocoupler is damaged.

[0005] The utility model is achieved through the following technical solutions:

[0006] A power-off slow-down control circuit includes an MCU, a motor, a diode connected to the positive electrode of the motor, and further includes:

[0007] The first switching circuit includes a first switching tube and a current limiting component, wherein one electrode terminal of the first switching tube is connected to the cathode of the diode, the other electrode terminal of the first switching tube is connected to the current limiting component, and the other terminal of the current limiting component is connected to the cathode of the electrode; the first switching circuit also includes a first voltage divider connected between the cathode of the diode and the control terminal of the first switching tube, and a fifth voltage divider connected between the control terminal of the first switching tube and the cathode of the motor; when the difference between the voltage at the first electrode terminal of the first switching tube and the voltage at the control terminal of the first switching tube is greater than a threshold, the first switching tube is turned on;

[0008] a second switch circuit, connected between the cathode of the diode and the control terminal of the first switch tube, and configured to disconnect the control terminal of the first switch tube from the cathode of the diode when power is off;

[0009] The third switch circuit is connected to the second switch circuit and is used to control the second switch circuit to be turned on when powered on; when powered on, the MCU controls the third switch circuit to be turned on.

[0010] Furthermore, the first switch tube includes a PMOS tube or a PNP transistor.

[0011] Furthermore, the second switching circuit includes a photocoupler, one end of the photoreceiver of the photocoupler is connected to the cathode of the diode, and the other end of the photoreceiver is connected to the control end of the first switching tube; one end of the light emitter of the photocoupler is connected to the ground, and the other end is connected to the power supply.

[0012] Furthermore, the third switching circuit is arranged between the light emitting device and the power supply; the third switching circuit includes a third switching tube, which is a PNP type transistor, the collector of the third switching tube is connected to the light emitting device, the emitter of the third switching tube is connected to the power supply, and the base of the third switching tube is connected to the MCU.

[0013] Furthermore, the second switching circuit includes a second switching tube, which is a PNP transistor; the emitter of the second switching tube is connected to the cathode of the diode, the collector of the second switching tube is connected to the control end of the first switching tube, the base of the second switching tube is connected to the third switching circuit, and the base of the second switching tube is connected to the cathode of the diode through a tenth resistor.

[0014] Furthermore, the third switching circuit is arranged between the second switching circuit and the ground terminal; the third switching circuit includes a third switching tube, which is an NPN-type transistor, the collector of the third switching tube is connected to the second switching circuit, the emitter of the third switching tube is connected to the ground terminal, and the base of the third switching tube is connected to the MCU.

[0015] Furthermore, the third switching circuit includes a third switching tube and a third resistor connected in series between the control end of the third switching tube and the MCU, one electrode end of the third switching tube is grounded or connected to the power supply, and the other electrode end is connected to the second switching circuit; the third switching circuit also includes a fourth resistor connected between one end of the third resistor close to the MCU and the electrode end of the third switching tube away from the second switching circuit.

[0016] Furthermore, the first switch circuit further includes a current limiting component connected in series between the other electrode end of the first switch tube and the negative electrode of the electrode.

[0017] Furthermore, the first switch circuit further includes a first capacitor and a voltage regulator diode connected in parallel at both ends of the first voltage divider; and / or a second resistor is connected in series between the third switch circuit and the second switch circuit.

[0018] An intelligent toilet cover comprises the above-mentioned power-off slow-drop control circuit, and also comprises a seat ring and a cover plate, wherein the motor is connected to a driving member of the seat ring and / or the cover plate.

[0019] Compared with the prior art, the technical solution of the present utility model and its beneficial effects are as follows:

[0020] (1) The power-off slow-down control circuit of the present invention forms a slow-down loop through the first switch circuit and the motor. The second switch circuit controls the conduction of the first switch tube when the power is off, so that the cover and the seat can slowly descend when the power is off. When the power is on, the MCU controls the conduction of the third switch circuit, thereby controlling the conduction of the second switch circuit, and then the first switch tube is cut off and the slow-down loop is closed, so as to avoid the slow-down loop affecting the opening and closing of the toilet lid in the power-on state. A third switch circuit is added between the MCU and the second switch circuit to prevent the power supply voltage from directly backflowing to the MCU when the second switch circuit is damaged, thereby damaging the MCU.

[0021] (2) The utility model adopts the mode of MOS tube plus photoelectric coupler to achieve the slow falling of the cover and the seat ring, thereby improving the cost advantage. At the same time, the photoelectric coupler has an isolation function, which can effectively prevent the devices from damaging each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a principle block diagram of a power-off slow-down control circuit provided by an embodiment of the utility model;

[0023] Figure 2 This is a circuit schematic diagram of a power-off slow-down control circuit provided in Example 1 of the present utility model;

[0024] Figure 3 This is a circuit schematic diagram of a power-off slow-down control circuit provided in the second embodiment of the present utility model;

[0025] Figure 4 This is a circuit schematic diagram of a power-off slow-down control circuit provided in the third embodiment of the present utility model;

[0026] Figure 5 This is a circuit schematic diagram of a power-off slow-down control circuit provided by the fourth embodiment of the present utility model;

[0027] Figure 6 This is a circuit schematic diagram of a power-off slow-down control circuit provided by the fifth embodiment of the present utility model;

[0028] Figure 7 This is a circuit schematic diagram of a power-off slow-down control circuit provided in Example 6 of the present utility model. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] See Figure 1 A power-off slow-down control circuit includes an MCU, a motor, a diode connected to the positive pole of the motor, and a first switching circuit, a second switching circuit, and a third switching circuit.

[0031] The first switching circuit includes a first switching transistor Q1, one electrode of which is connected to the cathode of a diode D1, and the other electrode of the first switching transistor Q1 is connected to the cathode of the motor. The motor's positive electrode, diode D1, first switching transistor Q1, and the motor's cathode form a ramp-down circuit. To prevent damage to the motor due to a short circuit between the motor's positive and negative electrodes when the first switching transistor Q1 is turned on, a current limiting component is connected in series between the first switching transistor and the motor's cathode. Specifically, the motor's positive electrode, diode D1, first switching transistor Q1, current limiting component, and the motor's cathode form a ramp-down circuit.

[0032] The first switching circuit also includes a first voltage divider connected between the cathode of the diode and the control terminal of the first switching tube, and a fifth voltage divider connected between the control terminal of the first switching tube Q1 and the negative electrode of the motor. When the difference between the voltage at the electrode end of the first switching tube and the voltage at its control terminal is greater than a threshold, the first switching tube Q1 is turned on; otherwise, the first switching tube Q1 is turned off.

[0033] The second switch circuit is connected between the cathode of the diode and the control terminal of the first switch tube, and disconnects the control terminal of the first switch tube from the cathode of the diode when power is lost. The third switch circuit is connected to the second switch circuit and controls the second switch circuit to conduct when power is turned on. When power is turned on, the MCU controls the third switch circuit to conduct.

[0034] The operating principle is as follows: When the toilet lid is lowered without mains power, motor M generates an induced electromotive force, causing diode D1 to conduct in the forward direction. At this point, the second switching circuit disconnects the control terminal of the first switching tube from the cathode of diode D1. The voltage at the cathode of diode D1 passes through the first and fifth voltage divider components and returns to the cathode of the motor. During the downward movement, the induced electromotive force generated by motor M increases, and the voltage drop across the first voltage divider component also increases. Specifically, the difference ΔV between the voltage at one electrode of the first switching tube and the voltage at its control terminal gradually increases. When ΔV exceeds the conduction threshold of the first switching tube, first switching tube Q1 turns on, initiating the slow-down circuit formed by the motor's positive terminal, diode D1, first switching tube Q1, the current limiting component, and the motor's negative terminal.

[0035] When the power is turned on again, the MCU controls the third switch circuit to turn on, thereby controlling the second switch circuit to turn on, and then connecting one electrode end of the first switch tube to the control end. △V drops to 0V, which is less than the conduction condition of the first switch tube Q1. The first switch tube Q1 is cut off and the slow-down circuit is closed, preventing the slow-down circuit from affecting the opening and closing of the toilet lid in the power-on state.

[0036] Example 1

[0037] See Figure 2 The second switching circuit includes a photocoupler U1. One end of the photocoupler's light receiver U1B is connected to the cathode of diode D1, and the other end of the light receiver U1B is connected to the control end of the first switching tube Q1. One end of the photocoupler's light emitter U1A is connected to the ground terminal through the third switching circuit, and the other end is connected to the power supply 5V. The third switching circuit includes a third switching tube Q3, which is an NPN transistor. The collector of the third switching tube Q3 is connected to the light emitter U1A, the emitter of the third switching tube Q3 is connected to the ground terminal, and the base of the third switching tube Q3 is connected to the MCU. In this embodiment, the first switching tube is a PMOS tube, the first voltage divider is resistor R1, the fifth voltage divider is resistor R5, and the current limiting component includes resistors R6, R7, R8, and R9 connected in parallel. Capacitor C1 and voltage regulator D2 are also connected in parallel at both ends of resistor R1. Resistor R3 is connected in series between the base of the third switch tube Q3 and the MCU. Resistor R4 is connected between the end of resistor R3 close to the MCU and the base of the third switch tube. Resistor R2 is also connected in series between the third switch circuit and the second switch circuit.

[0038] When the power is off, the power supply 5V is cut off and the light receiver U1B is cut off. When the upper cover or the seat ring falls, the induced electromotive force generated by the motor M itself is divided by the resistor R1 and the resistor R5. The voltage difference △V at both ends of the resistor R1 is greater than the Vgs of the first switch tube Q1. (th) The first switch Q1 is turned on. The positive electrode of the motor → diode D1 → first switch Q1 → resistors R6-R9 → negative electrode, the slow-down circuit works to prevent the toilet lid or seat from falling rapidly due to gravity during the closing process when the power is off.

[0039] When powered on, the MCU sends a high level to the base of the third switch tube Q3, turning on the third switch tube Q3, thereby turning on the light emitter U1A, and then turning on the light receiver U1B. The voltage between the source and gate of the first switch tube Q1 is equal, the PMOS tube is turned off, and the slow-down loop is disconnected.

[0040] Example 2

[0041] See Figure 3 The basic principle of this embodiment is the same as that of the first embodiment, except that the first switch Q1 of this embodiment is a PNP transistor. When ΔV is greater than the first switch Q1 conduction threshold of 0.7V, the first switch Q1 is turned on.

[0042] Example 3

[0043] See Figure 4 This embodiment shares the same basic principles as the first embodiment, differing in the third switching circuit. Specifically, the third switching circuit of this embodiment includes a third switching transistor Q3, which is a PNP transistor. The collector of the third switching transistor Q3 is connected to the light receiver U1A, the emitter of the third switching transistor Q3 is connected to the power supply 5V, and the base of the third switching transistor is connected to the MCU.

[0044] Similarly, when power is off, optocoupler U1 is disconnected due to lack of power, thereby disconnecting light receiver U1B and turning on first switch Q1, activating the ramp-down circuit. When power is on, the MCU sends a low-level signal to the base of third switch Q3 (PNP transistor), turning it on, powering optocoupler U1 and light receiver U1B. First switch Q1 is turned off, disconnecting the ramp-down circuit.

[0045] Example 4

[0046] See Figure 5This embodiment shares the same principles as the third embodiment, differing in that the first switch Q1 in this embodiment utilizes a PNP transistor. When power is off, as the seat ring or cover plate falls, the voltage drop across resistor R1 gradually increases. When ΔV exceeds 0.7V, the first switch Q1 turns on, and the ramp-down circuit operates. When power is on, the ramp-down circuit is disconnected, in the same manner as in the third embodiment.

[0047] Example 5

[0048] See Figure 6 The principles of this embodiment are basically the same as those of the first embodiment, except that the second switch circuit of this embodiment includes a second switch tube Q2, which is a PNP transistor.

[0049] The emitter of the second switching tube Q2 is connected to the cathode of the diode D1, the collector of the second switching tube Q2 is connected to the gate of the first switching tube Q1, the base of the second switching tube Q2 is connected to the collector of the third switching tube Q3, and the base of the second switching tube Q2 is connected to the cathode of the diode D1 through the resistor R10.

[0050] When the power is off, the second switch tube Q2 is turned off. When the voltage difference △V across the resistor R1 is greater than the Vgs of the first switch tube Q1 (th) , the first switch Q1 is turned on, and the ramp-down circuit operates. When powered on, the MCU sends a high level to the third switch Q3, turning it on. This pulls down the base voltage of the second switch Q2, turning it on, and the first switch Q1 is turned off, disconnecting the ramp-down circuit.

[0051] Example 6

[0052] See Figure 7 The operating principle of this embodiment is the same as that of the sixth embodiment, except that the first switch Q1 of this embodiment uses a PNP transistor. When ΔV is greater than the first switch Q1's conduction threshold of 0.7V, the first switch Q1 turns on. The circuit operating principles during power-off and power-on are the same as those of the sixth embodiment.

[0053] The foregoing description shows and describes preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A power-off slow-down control circuit, comprising an MCU, a motor, and a diode connected to the positive pole of the motor, characterized in that: Also includes: The first switching circuit includes a first switching tube and a current limiting component, wherein one electrode terminal of the first switching tube is connected to the cathode of the diode, and the other electrode terminal of the first switching tube is connected to the cathode of the electrode; the first switching tube is also included. A first voltage divider is connected between the cathode of the diode and the control terminal of the first switching tube, and a fifth voltage divider is connected between the control terminal of the first switching tube and the cathode of the motor; when the difference between the voltage at the first electrode terminal of the first switching tube and the voltage at the control terminal of the first switching tube is greater than a threshold, the first switching tube is turned on; a second switch circuit, connected between the cathode of the diode and the control terminal of the first switch tube, and configured to disconnect the control terminal of the first switch tube from the cathode of the diode when power is off; The third switch circuit is connected to the second switch circuit and is used to control the second switch circuit to be turned on when powered on; when powered on, the MCU controls the third switch circuit to be turned on.

2. The power-off slow-down control circuit according to claim 1, characterized in that: The first switch tube includes a PMOS tube or a PNP transistor.

3. The power-off slow-down control circuit according to claim 1, characterized in that: The second switching circuit includes a photocoupler, one end of the photoreceiver of the photocoupler is connected to the cathode of the diode, and the other end of the photoreceiver is connected to the control end of the first switching tube; one end of the light emitter of the photocoupler is connected to the ground, and the other end is connected to the power supply.

4. The power-off slow-down control circuit according to claim 3, characterized in that: The third switching circuit is arranged between the light emitting device and the power supply; the third switching circuit includes a third switching tube, which is a PNP type transistor. The collector of the third switching tube is connected to the light emitting device, the emitter of the third switching tube is connected to the power supply, and the base of the third switching tube is connected to the MCU.

5. The power-off slow-down control circuit according to claim 1, characterized in that: The second switching circuit includes a second switching tube, which is a PNP transistor; the emitter of the second switching tube is connected to the cathode of the diode, the collector of the second switching tube is connected to the control end of the first switching tube, the base of the second switching tube is connected to the third switching circuit, and the base of the second switching tube is connected to the cathode of the diode through a tenth resistor.

6. A power-off slow-down control circuit according to claim 3 or 5, characterized in that: The third switching circuit is arranged between the second switching circuit and the ground end; the third switching circuit includes a third switching tube, which is an NPN-type transistor. The collector of the third switching tube is connected to the second switching circuit, the emitter of the third switching tube is connected to the ground end, and the base of the third switching tube is connected to the MCU.

7. The power-off slow-down control circuit according to claim 1, characterized in that: The third switching circuit includes a third switching tube and a third resistor connected in series between the control end of the third switching tube and the MCU. One electrode end of the third switching tube is grounded or connected to the power supply, and the other electrode end is connected to the second switching circuit. The third switching circuit also includes a fourth resistor connected between an end of the third resistor close to the MCU and an electrode end of the third switching tube away from the second switching circuit.

8. The power-off slow-down control circuit according to claim 1, characterized in that: The first switch circuit further includes a current limiting component connected in series between the other electrode end of the first switch tube and the negative electrode of the electrode.

9. The power-off slow-down control circuit according to claim 1, characterized in that: The first switch circuit further includes a first capacitor and a voltage regulator diode connected in parallel at both ends of the first voltage divider; and / or a second resistor is connected in series between the third switch circuit and the second switch circuit.

10. A smart toilet cover, characterized in that: It comprises a power-off slow-down control circuit as described in any one of claims 1 to 9, and also comprises a seat ring and a cover plate, and the motor is connected to the driving part of the seat ring and / or the cover plate.

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