Toilet bowl water pump power supply circuit and toilet bowl

Abstract

The application provides a toilet water pump power supply circuit and a toilet. The toilet water pump power supply circuit comprises a current detection circuit, an on-off control circuit and a first on-off circuit. The current detection circuit is connected in series between a power supply and a power supply end of a toilet water pump, and is connected with the first on-off control circuit. The first on-off circuit is connected with the power supply, the on-off control circuit and the power supply end of the toilet water pump respectively. In the application, the current of the toilet water pump is detected during power supply, and the connection between the power supply and the toilet water pump is directly disconnected when the current is too large, thereby effectively avoiding a large current during power supply.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a toilet water pump power supply circuit and a toilet. Background Technology

[0002] Currently, low-pressure flushing in smart toilets is widely accepted and recognized by customers. To achieve flushing even with low water pressure, most systems directly use a water pump to drive the toilet. However, during the water pump's operation, abnormal situations may occur, such as the pump jamming, running dry, or running for extended periods. These issues can increase the current supplied to the water pump, potentially burning out the pump and its control board if the current becomes too high.

[0003] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0004] The main purpose of this application is to provide a power supply circuit for a toilet water pump and a toilet, which aims to solve the technical problem of excessive current in the power supply process caused by abnormal operation of the toilet water pump in the prior art.

[0005] To achieve the above objectives, this application provides a toilet water pump power supply circuit, including: a current detection circuit, an on / off control circuit, and a first on / off circuit;

[0006] The current detection circuit is connected in series between the power supply and the power supply terminal of the toilet water pump, and is connected to the first on / off control circuit.

[0007] The first switching circuit is connected to the power supply, the switching control circuit, and the power supply terminal of the toilet water pump, respectively.

[0008] The current detection circuit is used to detect the power supply current input to the power supply terminal of the toilet water pump when the power supply is supplying power to the toilet water pump, and output the power supply current to the on / off control circuit.

[0009] The on / off control circuit is used to output a cut-off signal to the first on / off circuit when the power supply current is greater than the preset current.

[0010] The first on / off circuit is used to disconnect the power supply from the power terminal of the toilet water pump when the cut-off signal is received.

[0011] Optionally, the toilet water pump power supply circuit further includes: a voltage divider circuit;

[0012] The first terminal of the voltage divider circuit is connected to the power supply, and the second terminal of the voltage divider circuit is connected to the first on / off circuit.

[0013] The voltage divider circuit is used to divide the power supply voltage output by the power supply when the toilet water pump is started, and output the divided power supply voltage to the control terminal of the first on / off circuit.

[0014] The first on / off circuit is used to connect the power supply and the toilet water pump when the power supply voltage after voltage division is received.

[0015] Optionally, the voltage divider circuit includes: a first resistor and a second resistor;

[0016] The first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the control terminal of the first on / off circuit and the first end of the second resistor; the second end of the second resistor is grounded.

[0017] Optionally, the on / off control circuit includes: a transistor;

[0018] The emitter of the transistor is connected to the power supply and the first terminal of the current detection circuit, the base of the transistor is connected between the current detection circuit and the first switching circuit, and the collector of the transistor is connected to the control terminal of the first switching circuit.

[0019] Optionally, the first switching circuit includes: a first power transistor and a third resistor;

[0020] The input terminal of the first power transistor is connected to the current detection circuit, the output terminal of the first power transistor is connected to the power supply terminal of the toilet water pump, and the control terminal of the first power transistor is connected to the on / off control circuit through the third resistor.

[0021] Optionally, the current detection circuit includes: a fourth resistor;

[0022] The first end of the fourth resistor is connected to the power supply, and the second end of the fourth resistor is connected to the input terminal of the first on / off circuit.

[0023] Optionally, the toilet water pump power supply circuit further includes: a reverse protection circuit;

[0024] The anti-reverse circuit is connected in series between the power supply and the power supply terminal of the toilet water pump, and is used to isolate the reverse voltage generated on the side of the toilet water pump when the water pump stops.

[0025] The anti-reverse circuit includes: a first diode;

[0026] The positive terminal of the first diode is connected to the power supply, and the negative terminal of the first diode is connected to the first terminal of the current detection circuit.

[0027] Optionally, the toilet water pump power supply circuit further includes: a second on / off circuit;

[0028] The first end of the second switching circuit is connected to the power supply, and the second end of the second switching circuit is connected to the control board;

[0029] The second on / off circuit is used to receive the control signal output by the control board and control the power supply output voltage according to the control signal.

[0030] Optionally, the second switching circuit includes: a second power transistor, a fifth resistor, and a sixth resistor;

[0031] The input terminal of the second power transistor is connected to the power supply, the second terminal of the second power transistor is connected to the second terminal of the fifth resistor and the first terminal of the sixth resistor, the third terminal of the second power transistor and the second terminal of the sixth resistor are grounded, and the first terminal of the fifth resistor is connected to the control board.

[0032] In addition, to achieve the above objectives, this application also provides a toilet, which includes: a toilet water pump and a power supply circuit for the toilet water pump as described in any of the above claims.

[0033] This application provides a toilet water pump power supply circuit and a toilet. The toilet water pump power supply circuit includes: a current detection circuit, an on / off control circuit, and a first on / off circuit. The current detection circuit is connected in series between the power supply and the power terminal of the toilet water pump, and is also connected to the first on / off control circuit. The first on / off circuit is connected to the power supply, the on / off control circuit, and the power terminal of the toilet water pump. The current detection circuit is used to detect the power supply current input to the power terminal of the toilet water pump when the power supply is supplying power to the toilet water pump, and output the power supply current to the on / off control circuit. The on / off control circuit is used to output a cut-off signal to the first on / off circuit when the power supply current is greater than a preset current. The first on / off circuit is used to disconnect the connection between the power supply and the power terminal of the toilet water pump upon receiving the cut-off signal. This application detects the power supply current of the toilet water pump and directly disconnects the connection between the power supply and the toilet water pump when the power supply current is too high, thereby effectively avoiding excessive current during the power supply process. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the first embodiment of the toilet water pump power supply circuit proposed in this application;

[0036] Figure 2 This is a schematic diagram of the second embodiment of the toilet water pump power supply circuit proposed in this application;

[0037] Figure 3 This is a circuit diagram of the second embodiment of the toilet water pump power supply circuit proposed in this application;

[0038] Figure 4 This is a schematic diagram of the third embodiment of the toilet water pump power supply circuit proposed in this application;

[0039] Figure 5 This is a circuit diagram of the third embodiment of the toilet water pump power supply circuit proposed in this application.

[0040] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0045] Reference Figure 1 , Figure 1 This is a schematic diagram of the toilet pump power supply circuit proposed in the first embodiment of the toilet pump power supply circuit of this application. Based on Figure 1 This application presents a first embodiment of the toilet water pump power supply circuit.

[0046] In this embodiment, the toilet water pump power supply circuit includes: a current detection circuit 10, an on / off control circuit 20, and a first on / off circuit 30;

[0047] The current detection circuit 10 is connected in series between the power supply VCC and the power supply terminal of the toilet water pump, and is connected to the on / off control circuit 20.

[0048] The first on / off circuit 30 is connected to the power supply VCC, the on / off control circuit 20, and the power supply terminal of the toilet water pump.

[0049] It should be understood that during toilet use, the power supply VCC primarily powers the toilet's water pump, controlling its operation and filling the toilet with water. However, in actual use, the toilet's water pump may experience abnormal situations that cause excessive current from the power supply VCC while powering the toilet. This excessive current, which is the current present on the power supply branch of the power supply VCC when powering the toilet's water pump, can lead to the burnout of the toilet's water pump and other components such as the control board. For example, because the water pump used in smart toilets varies in quality depending on the region's tap water, impurities or scale may accumulate in the toilet tank after prolonged use, causing the water pump to become stuck and increase the power supply current, potentially burning out the pump and the main control board. Another example is that the water volume in a smart toilet tank is limited; continuous flushing can empty the tank, causing the pump to run dry, which in turn increases the power supply current and burns out the pump and the main control board. Furthermore, prolonged and continuous use of the toilet pump can cause it to overheat, increasing the power supply current and shortening its lifespan or even burning out the pump and the main control board.

[0050] It should be noted that the current detection circuit 10 is used to detect the current during the power supply process of the toilet water pump. This current detection circuit 10 can directly detect the supply current using devices such as an ammeter, or it can use a sampling resistor to collect the supply current by sampling voltage. The current detection circuit 10 needs to be installed between the power supply terminal of the toilet water pump and the power supply VCC. The first on / off circuit 30 is installed between the power supply VCC and the toilet water pump to control whether the power supply branch between them is conductive. This first on / off circuit 30 can connect the power supply VCC and the toilet water pump when there is no overcurrent, controlling the water intake of the toilet water pump; and disconnect the connection when there is an overcurrent, thus preventing the toilet water pump from burning out. This first on / off circuit 30 can be composed of circuit breakers, electrical components, or power transistors. The on / off control circuit 20 is used to control the specific on / off state of the first on / off circuit 30. The on / off control circuit 20 can trigger a circuit breaker when a large supply current is detected. For example, a comparator can be set in the on / off control circuit 20. By comparing the supply current with a preset current, if the supply current is greater than the preset current, the comparator outputs a level signal; if the supply current is not greater than the preset current, the comparator outputs a different level signal; thereby controlling whether the power supply branch between the power supply VCC and the toilet water pump is open or closed.

[0051] In a specific implementation, the current detection circuit 10 can detect the power supply current input to the power terminal of the toilet water pump when the power supply VCC supplies power to the toilet water pump, and output the power supply current to the on / off control circuit; the on / off control circuit 20 can compare the detected power supply current with a preset current, and output a cut-off signal to the first on / off circuit 30 when the power supply current is greater than the preset current; the first on / off circuit 30 disconnects the connection between the power supply VCC and the power terminal of the toilet water pump when it receives the cut-off signal.

[0052] Of course, the on / off control circuit 20 will not output a cut-off signal to the first on / off circuit 30 when the power supply current is not greater than the preset current. The first on / off circuit 30 maintains the connection between the toilet water pump and the power supply VCC during the power supply process.

[0053] The preset current is a pre-set current used to determine whether the power supply current is too high. The preset current can be set based on the current that could burn out components during the power supply process and the normal power supply current. For example, if the current that could burn out components is 1A, the preset current can be set to 0.9A or 0.8A, etc., of course, this preset current needs to be greater than the power supply current during the normal power supply process; while if the power supply current is usually 0.5A, the preset current can also be set to 0.6A or 0.7A, etc., of course, this preset current needs to be less than the current that could burn out components. The cutoff signal is a signal that controls the first on / off circuit 30 to disconnect the connection between the power supply VCC and the toilet water pump. This cutoff signal can be set according to the specific on / off device set in the first on / off circuit 30. For example, if the on / off device set in the first on / off circuit 30 is triggered by a high level, then the cutoff signal can be a high-level signal; correspondingly, if the on / off device is triggered by a low level, then the cutoff signal can be a low-level signal.

[0054] In this embodiment, a toilet water pump power supply circuit is provided, including: a current detection circuit 10, an on / off control circuit 20, and a first on / off circuit 30; the current detection circuit 10 is connected in series between the power supply VCC and the power supply terminal of the toilet water pump, and is connected to the first on / off control circuit 30; the first on / off circuit 30 is connected to the power supply VCC, the on / off control circuit 20, and the power supply terminal of the toilet water pump respectively. This application detects the power supply current of the toilet water pump, and in the event of excessive power supply current, directly disconnects the connection between the power supply and the toilet water pump using the first on / off circuit 30, thereby effectively avoiding excessive current during the power supply process.

[0055] Based on the first embodiment of the toilet pump power supply circuit described above, a second embodiment of the toilet pump power supply circuit of this application is proposed. (Refer to...) Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the toilet water pump power supply circuit proposed in this application.

[0056] In this embodiment, the toilet water pump power supply circuit further includes: a voltage divider circuit 40;

[0057] The first terminal of the voltage divider circuit 40 is connected to the power supply VCC, and the second terminal of the voltage divider circuit 40 is connected to the first on / off circuit 30.

[0058] It should be noted that during the normal operation of the toilet water pump, since a first on / off circuit 30 is set between the power supply VCC and the power supply terminal of the toilet water pump, it is also necessary to control the first on / off circuit 30 to connect the power supply terminal of the toilet water pump and the power supply VCC during the start-up process of the toilet water pump, so as to use the power supply VCC to supply power to the toilet water pump.

[0059] It should be understood that the voltage divider circuit 40 is used to divide the power supply voltage output from the power supply VCC. Considering that the toilet water pump power supply process already has a power supply VCC, this power supply VCC can be directly used to control the first switching circuit 30. However, the voltage required for the switching device in the first switching circuit 30 to conduct may not match the power supply voltage output from the power supply VCC, and is usually less than the supply voltage. Therefore, the power supply voltage output from the power supply VCC can be adjusted by the voltage divider circuit 40 and then output to the control terminal of the first switching circuit 30. Of course, the switching device in the first switching circuit 30 is a MOSFET, IGBT, or other device, which mainly controls the switching based on the voltage difference between the two electrodes. Alternatively, the power supply voltage output from the power supply VCC connected to the first switching circuit 30 can be connected to one electrode of the switching device (the voltage input terminal of the first switching circuit 30), and then the state of the switching device can be controlled by adjusting the input voltage of the second electrode (the control terminal of the first switching circuit 30).

[0060] In a specific implementation, when it is necessary to start the toilet water pump, the power supply VCC output voltage can be input to the voltage divider circuit 40. The voltage divider circuit 40 can divide the power supply voltage output by the power supply VCC and output the divided power supply voltage to the control terminal of the first on / off circuit 30. When the first on / off circuit 30 receives the divided power supply voltage, it connects the power supply VCC and the toilet water pump.

[0061] Reference Figure 3 , Figure 3 This is a circuit diagram of a second embodiment of the toilet water pump power supply circuit proposed in this application. Figure 3 In the circuit, the voltage divider circuit 40 includes: a first resistor R1 and a second resistor R2;

[0062] The first end of the first resistor R1 is connected to the power supply VCC, the second end of the first resistor R1 is connected to the control terminal of the first on / off circuit 30 and the first end of the second resistor R2; the second end of the second resistor R2 is grounded.

[0063] It should be understood that the first resistor R1 and the second resistor R2 are voltage divider resistors, and their resistance values ​​can be set according to the specific switching devices set within the first switching circuit 30. For example... Figure 3 The first power transistor Q2 in the first switching circuit 30 is a MOSFET. When the source of the MOSFET is connected to the power supply VCC, the voltage difference between the voltage input to the control terminal of the first switching circuit 30, i.e. the gate of the MOSFET, and the power supply VCC should be greater than the turn-on voltage of the MOSFET, thereby controlling the MOSFET to turn on.

[0064] In a specific implementation, the power supply VCC can output the power supply voltage to the first end of the first resistor R12. After the voltage is divided between the first resistor R1 and the second resistor R2, the voltage between the first resistor R1 and the second resistor R2, i.e. the power supply voltage after voltage division, can be output to the control terminal of the first switching circuit 30.

[0065] Reference Figure 3 ,exist Figure 3 The on / off control circuit 20 described herein includes: transistor Q1;

[0066] The emitter of transistor Q1 is connected to the power supply VCC and the first terminal of the current detection circuit 10, the base of transistor Q1 is connected between the current detection circuit 20 and the first on / off circuit 30, and the collector of transistor Q3 is connected to the control terminal of the first on / off circuit.

[0067] It should be understood that transistors are sensitive to current; as the current input to the base of the transistor changes, the corresponding conduction state of the transistor will also change. Figure 3 When the supply current increases, the voltage between the emitter and base of transistor Q1 will increase. When the voltage increases to a certain extent, i.e. when the supply current is greater than the preset current, there will be current between the emitter and base of transistor Q1, at which point transistor Q1 will conduct.

[0068] During the control of the first switching circuit 30 using transistor Q1, when the toilet pump is functioning normally, the supply current will not exceed the preset current. At this time, the voltage between the emitter and base of transistor Q1 is low, and there is no current between them. Transistor Q1 remains in the off state, and the power supply VCC normally powers the toilet pump. When the toilet pump malfunctions, causing an increase in the supply current, exceeding the preset current, the voltage between the emitter and base of transistor Q1 becomes high, and current flows between them. Transistor Q1 is then in the on state, causing the voltage input to the control terminal of the first switching circuit 30 (i.e., the control terminal of the first power transistor Q2) to change from a divided supply voltage to an undivided supply voltage. This controls the first power transistor Q2 to turn off, meaning the first switching circuit 30 disconnects the power supply VCC from the toilet pump, stopping the power supply to the toilet pump.

[0069] It should be understood that, in Figure 3 In the circuit, the first switching circuit 30 includes: a first power transistor Q2 and a third resistor R3;

[0070] The input terminal of the first power transistor Q2 is connected to the current detection circuit 10, the output terminal of the first power transistor Q2 is connected to the power supply terminal of the toilet water pump, and the control terminal of the first power transistor Q2 is connected to the on / off control circuit 20 through the third resistor R3.

[0071] It should be understood that power transistors typically have a certain switching function, such as MOSFETs and IGBTs. The switching state of the power transistor can be controlled by controlling the voltage difference between its two electrodes. In this embodiment, the connection between the power supply VCC and the toilet pump is controlled by the second power transistor Q1. The power supply terminal may include a positive terminal and a negative terminal. The first switching circuit 30 is connected to the positive terminal. A second diode D2 is disposed between the positive and negative terminals. The anode of the second diode D2 is connected to the negative terminal, and the cathode is connected to the positive terminal.

[0072] In practical implementation, when transistor Q1 is off, the power supply voltage output by the power supply VCC is directly input to the input terminal of the first power transistor Q2 through the current detection circuit 10. The power supply voltage output by VCC, after being divided by the first resistor R1 and the second resistor R2, is then input to the control terminal of the first power transistor Q2 through the third resistor R3. At this time, there is a large voltage difference between the input terminal and the control terminal of the first power transistor Q2, causing Q2 to conduct, and the power supply VCC supplies power to the toilet pump. When transistor Q1 is on, the power supply voltage output by the power supply VCC is directly input to the input terminal of the first power transistor Q2 through the current detection circuit 10. The power supply voltage output by VCC is also directly input to the control terminal of the first power transistor Q2 through the third resistor R3. At this time, there is no large voltage difference between the input terminal and the control terminal of the first power transistor Q2, causing Q2 to be off, and the power supply VCC stops supplying power to the toilet pump.

[0073] Furthermore, considering the current sensitivity of transistor Q1, in this embodiment, the current detection circuit 10 can directly sample the supply current using a sampling resistor. Therefore, the current detection circuit 10 can directly include: a fourth resistor R4.

[0074] The first end of the fourth resistor R4 is connected to the power supply VCC, and the second end of the fourth resistor R4 is connected to the input terminal of the first on / off circuit 30.

[0075] by Figure 3 For example, in Figure 3 In this circuit, the fourth resistor R4 is positioned between the power supply VCC and the toilet water pump, specifically between the emitter and base of transistor Q1. Due to the placement of the fourth resistor R4, when the power supply current passes through it, a certain voltage difference is created between the emitter and base of transistor Q1, thereby directly controlling whether transistor Q1 conducts.

[0076] In practice, when the toilet pump is not malfunctioning, the power supply current will not exceed the preset current. At this time, the voltage difference across the fourth resistor R4 is small, that is, the voltage difference between the emitter and base of transistor Q1 is small, and transistor Q1 will not conduct. However, when the toilet pump malfunctions, the power supply current exceeds the preset current. At this time, the voltage difference across the fourth resistor R4 is large, that is, the voltage difference between the emitter and base of transistor Q1 is large, and transistor Q1 conducts.

[0077] Furthermore, refer to Figure 2 In this embodiment, the toilet water pump power supply circuit further includes: anti-reverse circuit 50;

[0078] The anti-reverse circuit 50 is connected in series between the power supply VCC and the power supply terminal of the toilet water pump.

[0079] It should be understood that during normal operation of the toilet pump, it is powered by the power supply VCC. However, when it is necessary to stop the toilet pump, it does not stop immediately. The continued rotation of the toilet pump generates a certain reverse voltage, which, flowing through the power supply branch, can damage some components within the power supply circuit. For example, if this reverse voltage flows into the control terminal, it may burn out the control board; or, if the reverse voltage flows into the power supply VCC, it may affect the power supply VCC.

[0080] To address the aforementioned issues, this embodiment also includes an anti-reverse circuit 50, which prevents reverse voltage flow. This anti-reverse circuit 50 can prevent reverse voltage from affecting the components by means of reverse cutoff or discharge. In specific implementation, the reverse circuit 50 can isolate the reverse voltage generated on the toilet pump side when the water pump stops, thus preventing the reverse voltage from affecting the components in the toilet pump's power supply circuit. The reverse voltage is the voltage generated when the toilet pump does not immediately stop rotating.

[0081] The anti-reverse circuit 20 includes: a first diode D1;

[0082] The positive terminal of the first diode D1 is connected to the power supply VCC, and the negative terminal of the first diode D1 is connected to the first terminal of the current detection circuit 10.

[0083] exist Figure 3 In this circuit, due to the placement of the first diode D1, by utilizing the unidirectional conduction characteristic of the first diode D1, it is possible to avoid affecting the normal power supply VCC without disrupting its operation. Furthermore, since this reverse voltage does not flow through the power supply VCC side, it will also not flow into the control board through the voltage divider circuit 40, thus preventing the reverse voltage from burning out the control board.

[0084] Based on the first or second embodiment of the toilet water pump power supply circuit described above, a third embodiment of the toilet water pump power supply circuit of this application is proposed.

[0085] Reference Figure 4 , Figure 4 This is a schematic diagram of the third embodiment of the toilet water pump power supply circuit proposed in this application.

[0086] In this embodiment, the toilet water pump power supply circuit further includes: a second on / off circuit 60;

[0087] The first end of the second switching circuit 60 is connected to the power supply VCC, and the second end of the second switching circuit 60 is connected to the control board.

[0088] It should be understood that the toilet pump is not usually in continuous operation, but rather starts when the tank needs water. Therefore, in this embodiment, a second on / off circuit 60 is also provided. This second on / off circuit 60 controls the output voltage of the power supply VCC, while the first on / off circuit 30 controls whether the power supply voltage is output to the toilet pump. The control board is a control component that controls whether the power supply VCC outputs power voltage. When the toilet tank needs water, the control board can output a corresponding control signal to control the second on / off circuit 60 to form a complete loop for the output of the power supply VCC, thereby controlling the output of the power supply VCC.

[0089] In practice, when the water level in the toilet tank is insufficient or when the toilet is flushed, the control board can output a control signal to the second on / off circuit 60. Upon receiving the control signal from the control board, the second on / off circuit 60 can directly control the power supply VCC to form a complete power supply circuit, thereby enabling the power supply to output voltage to power the toilet pump. Conversely, when the water level in the tank is sufficient and no water intake is required, the control board will not output this control signal, keeping the toilet pump in a stopped state.

[0090] Reference Figure 5 , Figure 5 This is a circuit diagram of the third embodiment of the toilet water pump power supply circuit proposed in this application.

[0091] exist Figure 5 In the second switching circuit 50, the components include: a second power transistor Q3, a fifth resistor R5, and a sixth resistor R6.

[0092] The input terminal of the second power transistor Q3 is connected to the power supply VCC through the voltage divider circuit 40. The second terminal of the second power transistor Q3 is connected to the second terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6. The third terminal of the second power transistor Q3 and the second terminal of the sixth resistor R6 are grounded. The first terminal of the fifth resistor R5 is connected to the control board.

[0093] It should be noted that the second power transistor Q3 is a switching transistor with a control terminal, such as a MOSFET. The control terminal of the second power transistor Q3 can be connected to the control board through the fifth resistor R5 to receive the control signal output by the control board.

[0094] Furthermore, considering that the control terminal of the second power transistor Q3 may be falsely triggered by external interference, such as static electricity or electromagnetic interference, which could create a voltage at the control terminal of the second power transistor Q3 that could turn it on, the second on / off circuit 60 also includes a sixth resistor R6. This sixth resistor R6 is a bias resistor, which ensures that the control board does not output a control signal, thus preventing false activation due to other interference.

[0095] Further based on Figure 5 The specific operation process of the toilet water pump power supply circuit is as follows: When the toilet tank needs water inlet, the control board can output a high-level control signal to control the second power transistor Q3 to turn on. At this time, the power supply voltage output by the power supply VCC passes through the emitter of transistor Q1, the first diode D1, and the fourth resistor R4 to reach the base of transistor Q1. According to Ohm's law, the voltage UEB between the emitter and base of transistor Q is UD + IR4. According to the characteristics of transistors, as long as the voltage UEB is less than 0.7V, no current flows between the emitter and base of transistor Q. At this time, transistor Q1 is turned off, the potential at the input terminal of the first power transistor Q2 is about 12V, and the potential at the control terminal of the first power transistor Q2 is about 6V. That is, the voltage difference UGS between the input terminal and the control terminal of the first power transistor Q2 is -6V. The first power transistor Q2 turns on, and the toilet water pump works normally. During normal operation of the toilet pump, if abnormalities such as pump jamming or overheating occur, leading to an increase in the power supply current (i.e., an increase in the power supply current of the voltage UEB between the emitter and base of transistor Q1 = UD + IR4), the voltage UEB between the emitter and base of transistor Q1 will inevitably increase. When the voltage UEB is greater than 0.7V, current flows between the emitter and base of transistor Q1, causing transistor Q1 to turn on. At this time, the potentials at the input and control terminals of the first power transistor Q2 are both approximately 12V, meaning the voltage difference UGS between the input and control terminals of the first power transistor Q2 is 0V. Therefore, the first power transistor Q2 is turned off, and the toilet pump does not operate due to the lack of current, thus achieving overcurrent protection for the toilet pump.

[0096] Therefore, the overcurrent point of this protection circuit can be determined by selecting a fixed type of first diode D1 and setting the resistance value of the fourth resistor R4. For example, if the overcurrent protection point is set to 5A, UEB = 0.7V, and the first diode D1 is selected with a forward voltage drop of 0.5V UD, then the resistance value of the fourth resistor R4 is: (UEB-UD) / I = (0.7V-0.5V) / 5A = 0.04Ω. When R4 is 0.04Ω, the supply current I is greater than 5A, the first power transistor Q1 is cut off, the power supply VCC no longer supplies power to the toilet pump, and no current flows through the toilet pump, thus protecting the toilet pump and the main control board.

[0097] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power supply circuit for a toilet water pump, characterized in that, include: Current detection circuit, on / off control circuit, and first on / off circuit; The current detection circuit is connected in series between the power supply and the power supply terminal of the toilet water pump, and is connected to the first on / off circuit. The first switching circuit is connected to the power supply, the switching control circuit, and the power supply terminal of the toilet water pump, respectively. The current detection circuit is used to detect the power supply current input to the power supply terminal of the toilet water pump when the power supply is supplying power to the toilet water pump, and output the power supply current to the on / off control circuit. The on / off control circuit is used to output a cut-off signal to the first on / off circuit when the power supply current is greater than the preset current. The first on / off circuit is used to disconnect the power supply from the power terminal of the toilet water pump when the cut-off signal is received.

2. The toilet water pump power supply circuit as described in claim 1, characterized in that, The toilet water pump power supply circuit also includes: a voltage divider circuit; The first terminal of the voltage divider circuit is connected to the power supply, and the second terminal of the voltage divider circuit is connected to the first on / off circuit. The voltage divider circuit is used to divide the power supply voltage output by the power supply when the toilet water pump is started, and output the divided power supply voltage to the control terminal of the first on / off circuit. The first on / off circuit is used to connect the power supply and the toilet water pump when the power supply voltage after voltage division is received.

3. The toilet water pump power supply circuit as described in claim 2, characterized in that, The voltage divider circuit includes: a first resistor and a second resistor; The first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the control terminal of the first on / off circuit and the first end of the second resistor; the second end of the second resistor is grounded.

4. The toilet water pump power supply circuit as described in claim 1, characterized in that, The on / off control circuit includes: a transistor; The emitter of the transistor is connected to the power supply and the first terminal of the current detection circuit, the base of the transistor is connected between the current detection circuit and the first switching circuit, and the collector of the transistor is connected to the control terminal of the first switching circuit.

5. The toilet water pump power supply circuit as described in claim 4, characterized in that, The first switching circuit includes: a first power transistor and a third resistor; The input terminal of the first power transistor is connected to the current detection circuit, the output terminal of the first power transistor is connected to the power supply terminal of the toilet water pump, and the control terminal of the first power transistor is connected to the on / off control circuit through the third resistor.

6. The toilet water pump power supply circuit as described in claim 5, characterized in that, The current detection circuit includes: a fourth resistor; The first end of the fourth resistor is connected to the power supply, and the second end of the fourth resistor is connected to the input terminal of the first on / off circuit.

7. The toilet water pump power supply circuit as described in claim 1, characterized in that, The toilet water pump power supply circuit also includes: a reverse protection circuit; The anti-reverse circuit is connected in series between the power supply and the power supply terminal of the toilet water pump, and is used to isolate the reverse voltage generated on the side of the toilet water pump when the water pump stops. The anti-reverse circuit includes: a first diode; The positive terminal of the first diode is connected to the power supply, and the negative terminal of the first diode is connected to the first terminal of the current detection circuit.

8. The toilet water pump power supply circuit as described in any one of claims 1 to 7, characterized in that, The toilet water pump power supply circuit also includes: a second on / off circuit; The first end of the second switching circuit is connected to the power supply, and the second end of the second switching circuit is connected to the control board; The second on / off circuit is used to receive the control signal output by the control board and control the power supply output voltage according to the control signal.

9. The toilet water pump power supply circuit as described in claim 8, characterized in that, The second switching circuit includes: a second power transistor, a fifth resistor, and a sixth resistor; The input terminal of the second power transistor is connected to the power supply, the second terminal of the second power transistor is connected to the second terminal of the fifth resistor and the first terminal of the sixth resistor, the third terminal of the second power transistor and the second terminal of the sixth resistor are grounded, and the first terminal of the fifth resistor is connected to the control board.

10. A toilet seat, characterized in that, The toilet includes: a toilet water pump and a power supply circuit for the toilet water pump as described in any one of claims 1 to 9.

Images