A doorbell control circuit and doorbell system

Abstract

The application provides a doorbell control circuit and a doorbell system. The doorbell control circuit is used in the doorbell system. The doorbell system comprises a ringing module and a doorbell module which are arranged in series in a power supply loop, and the doorbell control circuit is arranged in parallel with the ringing module. The doorbell control circuit comprises a first power supply end and a second power supply end which are electrically connected with two power supply ends of the ringing module respectively. A voltage comparison circuit compares the power supply voltage of the ringing module with a reference voltage and outputs a result signal. A switch circuit is electrically connected with the voltage comparison circuit and is turned on or off based on the result signal output by the voltage comparison circuit. When the doorbell module is in a pressed state, the switch circuit is in an off state to increase the resistance of the doorbell control circuit. When the doorbell module is in an unpressed state, the switch circuit is in an on state to reduce the resistance of the doorbell control circuit.

Description

Technical Field

[0001] This application relates to the field of doorbell technology, specifically to a doorbell control circuit and doorbell system. Background Technology

[0002] Traditional doorbell systems typically include a doorbell module, a ringing module, and a power supply module. When the doorbell is pressed, a short circuit occurs. The system detects whether the doorbell has been pressed by monitoring the change in current in the circuit, and then connects the existing ringing module to the power supply circuit to ring it. This approach requires an additional current sensor to monitor the current magnitude and send a signal to a controller, which then controls the ringing module to connect to the power supply circuit. This method is costly and has a complex control process. Utility Model Content

[0003] In view of the above problems, this application provides a doorbell control circuit and doorbell system that achieves ringing control and maintains normal doorbell operation through voltage comparison, thereby reducing costs and simplifying control.

[0004] To solve the above-mentioned technical problems, the technical solution adopted in this application is conceived as follows:

[0005] This application provides a doorbell control circuit for a doorbell system. The doorbell system includes a ringing module and a doorbell module connected in series in a power supply circuit. The doorbell system also includes a doorbell control circuit connected in parallel with the ringing module. The doorbell control circuit includes: a first power supply terminal and a second power supply terminal, electrically connected to the two power supply terminals of the ringing module, respectively; a voltage comparison circuit connected between the first power supply terminal and the second power supply terminal, used to compare the power supply voltage of the ringing module with a reference voltage and output a result signal; and a switching circuit connected between the first power supply terminal and the second power supply terminal and electrically connected to the voltage comparison circuit. The switching circuit is switched on and off based on the result signal. When the doorbell module is in a pressed state, it is short-circuited, and the switching circuit is in a closed state to increase the resistance of the doorbell control circuit. When the doorbell module is not pressed, the switching circuit is in a conducting state to decrease the resistance of the doorbell control circuit.

[0006] This application provides a doorbell system, which includes: a ringing module, a doorbell module, and the doorbell control circuit. The ringing module and the doorbell module are connected in series in the power supply circuit, and the doorbell control circuit is connected in parallel with the ringing module.

[0007] The advantages of this application's implementation method, which differs from existing technologies, are as follows: The ringing module and doorbell module are connected in series in the power supply circuit, and the voltage comparison circuit and switching circuit are connected in parallel between the first power supply terminal and the second power supply terminal, which are connected in parallel with the ringing module, and in series with the doorbell module. When the doorbell module is pressed, a short circuit occurs, reducing the voltage drop across the doorbell module and increasing the voltage drop across the ringing module and doorbell control circuit, i.e., its power supply voltage. This causes the voltage comparison circuit to control the switching circuit to turn off. When the switching circuit is off, the doorbell control... The increased resistance of the doorbell control circuit reduces its current, allowing the ringing module to receive a sufficient current to trigger the ringing. When the doorbell module is in an unpressed state (i.e., reset), it is not short-circuited, resulting in a larger voltage drop across the doorbell module and a smaller voltage drop across the ringing module and doorbell control circuit. This lower supply voltage allows the voltage comparator circuit to control the switching circuit to conduct. When the switching circuit is on, the resistance of the doorbell control circuit decreases, increasing its current and ensuring the doorbell module receives a sufficient current to maintain normal operation. The current shunt to the ringing module decreases, placing it in a non-ringing state. Therefore, this application replaces the traditional current detection scheme with a voltage comparison method, eliminating the need for an additional current sensor to achieve ringing control and maintain normal doorbell operation, thus reducing costs and simplifying control. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0009] Figure 1 This is a schematic diagram of the structure of the first embodiment of the doorbell control circuit of this application;

[0010] Figure 2 This is a schematic diagram of the structure of the second embodiment of the doorbell control circuit of this application;

[0011] Figure 3 This is a schematic diagram of the structure of the third embodiment of the doorbell control circuit of this application;

[0012] Figure 4 yes Figure 3 A schematic diagram of the circuit structure of the doorbell control circuit in the embodiment;

[0013] Figure 5 This is a schematic diagram of the structure of an embodiment of the doorbell system of this application. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings, not all structures. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0015] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0016] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0017] This application proposes a doorbell control circuit for a doorbell system (see reference). Figure 5 The doorbell system includes a ringing module 20 and a doorbell module 30 connected in series in the power supply circuit, and a doorbell control circuit 10 connected in parallel with the ringing module 20. Among them, such as... Figure 1 As shown, the doorbell control circuit 10 includes: a first power supply terminal 11 and a second power supply terminal 12, a voltage comparison circuit 13, and a switching circuit 14. The first power supply terminal 11 is electrically connected to one end of the ringing module 20, and the second power supply terminal 12 is electrically connected to the other end of the ringing module 20. The voltage comparison circuit 13 is connected between the first power supply terminal 11 and the second power supply terminal 12, and is used to compare the power supply voltage of the ringing module 20 with a reference voltage and output a result signal. The switching circuit 14 is connected between the first power supply terminal 11 and the second power supply terminal 12, and is electrically connected to the voltage comparison circuit 13, and performs on / off switching based on the result signal output by the voltage comparison circuit 13.

[0018] In this embodiment, when the doorbell module 30 is pressed, it is short-circuited, and the switch circuit 14 is in the off state to increase the resistance of the doorbell control circuit 10 and trigger the ringing. When the doorbell module 30 is not pressed, the switch circuit 14 is in the on state to reduce the resistance of the doorbell control circuit 10, thereby increasing the current of the doorbell module 30 and ensuring that the doorbell module 30 maintains normal operation when it is not pressed.

[0019] The first power supply terminal 11 is electrically connected to one end of the ringing module 20, and the second power supply terminal 12 is electrically connected to the other end of the ringing module 20, so that the doorbell control circuit 10 and the ringing module 20 are connected in parallel in the power supply circuit; the doorbell module 30, the doorbell control circuit 10 and the ringing module 20 are connected in series in the power supply circuit; the voltage comparison circuit 13 and the switching circuit 14 are respectively connected in parallel with the ringing module 20.

[0020] When the doorbell module 30 is pressed, it is short-circuited, reducing the voltage drop across the doorbell module 30 and increasing the voltage drop across the ringing module 20 and the doorbell control circuit 10 (i.e., their supply voltage). This causes the voltage comparator circuit 13 to control the switch circuit 14 to turn off. When the switch circuit 14 is off, the resistance of the doorbell control circuit 10 increases, leading to a decrease in its current, allowing the ringing module 20 to receive a sufficiently large current to trigger the ringing. When the doorbell module 30 is not pressed (i.e., the ring is reset), it is not short-circuited, resulting in a larger voltage drop across the doorbell module 30 and a smaller voltage drop across the ringing module 20 and the doorbell control circuit 10 (i.e., their supply voltage is low). This causes the voltage comparator circuit 13 to control the switch circuit 14 to turn on. When the switch circuit 14 is on, the resistance of the doorbell control circuit 10 decreases, leading to an increase in its current, allowing the doorbell module 30 to receive a sufficiently large current to maintain normal operation. The current shunted to the ringing module 20 decreases, placing it in a non-ringing state. Therefore, this application replaces the traditional current detection scheme with a voltage comparison method, which can realize the ringing control and maintain the normal operation of the doorbell without the need to set up an additional current sensor. This can reduce costs and simplify control. Moreover, the simplified circuit structure can be integrated into a small module, making it easy to connect to the original ringing module.

[0021] In some embodiments, the first power supply terminal 11 can be connected to a power supply voltage, and the second power supply terminal 12 can be grounded.

[0022] In some embodiments, such as Figure 3The voltage comparison circuit 13 includes a voltage divider circuit 131 and a comparator 132. The voltage divider circuit 131 is connected between the first power supply terminal 11 and the second power supply terminal 12. The first input terminal of the comparator 132 is electrically connected to the voltage divider terminal of the voltage divider circuit 131. The second input terminal of the comparator 132 is connected to a reference voltage. The output terminal of the comparator 132 is electrically connected to the switching circuit 14. The comparator 132 is used to compare the magnitude relationship between the voltage divider terminal voltage and the reference voltage and output the result signal.

[0023] The voltage divider circuit 131 is used to divide the above-mentioned supply voltage to obtain the voltage divider terminal voltage. The comparator 132 compares the voltage divider terminal voltage with the reference voltage. If the voltage divider terminal voltage is greater than the reference voltage, the first result signal is output. If the voltage divider terminal voltage is less than the reference voltage, the second result signal is output.

[0024] In some embodiments, comparator 132 may also be a general operational amplifier or a Schmitt trigger, etc.

[0025] This application can accurately determine the voltage status of the power supply terminal and generate a result signal by comparing the voltage at the voltage divider terminal of the voltage divider circuit 131 with the reference voltage, thereby realizing the automatic switching of circuit functions. The voltage status identification can be completed without complex detection circuits by using the voltage divider comparison method, which reduces the overall circuit cost.

[0026] In some embodiments, such as Figure 3 The voltage comparison circuit 13 further includes a reference voltage circuit 133, which is connected between the first power supply terminal 11 and the second power supply terminal 12. The regulated output terminal of the reference voltage circuit 133 is electrically connected to the second input terminal of the comparator 132 to provide a stable reference voltage for the comparator 132.

[0027] A stable reference voltage is provided by the reference voltage circuit 133, enabling the comparator 132 to accurately determine the changes in the voltage at the voltage divider terminal of the voltage divider circuit 131, thereby reliably controlling the on / off state of the switching circuit 14. This design improves the circuit's anti-interference capability against power supply voltage fluctuations. The cooperation between the voltage divider circuit 131 and the reference voltage circuit 133 ensures that when the doorbell is pressed or not pressed, the first input terminal of the comparator 132 can obtain a voltage at the voltage divider terminal that is positively correlated with the power supply voltage, while the second input terminal can obtain a stable reference voltage; thus, it can stably switch the power supply mode, so that the ringing module 20 can obtain sufficient power supply current when the bell is pressed, and the doorbell module 30 can obtain normal operating current from the power supply when the bell is not pressed.

[0028] In some embodiments, such as Figure 4As shown, the voltage divider circuit 131 includes: a first resistor R6 and a second resistor R8. One end of the first resistor R6 is electrically connected to the first power supply terminal 11, and the other end serves as the voltage divider terminal. One end of the second resistor R8 is electrically connected to the other end of the first resistor R6, and the other end is electrically connected to the second power supply terminal 12.

[0029] In this embodiment, the voltage divider circuit 131 is composed of a first resistor R6 and a second resistor R8 connected in series. The resistance values ​​of the first resistor R6 and the second resistor R8 can be flexibly set according to the required voltage division ratio. The voltage at the voltage divider terminal of the voltage divider circuit 131 is used to compare with a reference voltage, and the on / off state of the switching circuit is controlled by the logic judgment of the comparator 132. In specific implementations, resistors with different resistance values ​​can be used to achieve the voltage division function, or the voltage division ratio can be adjusted by an adjustable resistor to adapt to different power supply voltage ranges.

[0030] The simple structure of the voltage divider circuit 131 reduces the overall cost, and the use of fewer components makes the circuit smaller and easier to integrate into traditional doorbell systems.

[0031] In some embodiments, such as Figure 4 As shown, the reference voltage circuit 133 includes: a third resistor R4 and a Zener diode D4. One end of the third resistor R4 is electrically connected to the first power supply terminal 11, and the other end serves as the regulated output terminal. One end of the Zener diode D4 is electrically connected to the other end of the third resistor R4, and the other end is electrically connected to the second power supply terminal 12.

[0032] In this embodiment, the reference voltage circuit 133 achieves stable voltage output through the series connection of the third resistor R4 and the Zener diode D4. Utilizing the breakdown characteristic of the Zener diode D4, the input voltage can be converted into a fixed reference voltage, enabling the comparator 132 to accurately determine the state of the supply voltage based on the reference voltage. In specific implementations, combinations of resistors and Zener diodes with different voltage regulation values ​​can be used. For example, a 5.1V or 3.3V Zener diode can be used instead of a 2.5V one, or the voltage division ratio can be changed by adjusting the value of the third resistor R4 to adapt to different voltage ranges. In specific implementations, the third resistor R4 can be a carbon film resistor or a metal film resistor, and the Zener diode D4 can be a Zener diode or an adjustable parallel regulator such as TL431.

[0033] In some embodiments, such as Figure 4 As shown, the switching circuit 14 includes: a fourth resistor R1, a fifth resistor R7, and a switching transistor Q1. One end of the fourth resistor R1 is electrically connected to the first power supply terminal 11; one end of the fifth resistor R7 is electrically connected to the output terminal of the comparator 132; the control terminal of the switching transistor Q1 is electrically connected to the other end of the fifth resistor R7; the first conducting terminal of the switching transistor Q1 is electrically connected to the other end of the fourth resistor R1; and the second conducting terminal of the switching transistor Q1 is electrically connected to the second power supply terminal 12.

[0034] In this embodiment, one end of the fifth resistor R7 is connected to the output terminal of comparator 132, and the other end is connected to the control terminal of switch Q1. When comparator 132 outputs the first result signal, switch Q1 is in the off state, thereby increasing the resistance of doorbell control circuit 10; when comparator outputs the second result signal, switch Q1 is in the on state, thereby decreasing the resistance of doorbell control circuit 10. In specific implementations, the fourth resistor R1 and the fifth resistor R7 can be set as needed, and switch Q1 can be a MOSFET or replaced with a relay, as long as the control terminal is connected to the output terminal of comparator 132, and the on terminal and the power supply terminal form an on / off control relationship.

[0035] The output signal of comparator 132 controls the on / off state of switch Q1, enabling the doorbell control circuit 10 to automatically change its resistance value according to the doorbell button status. This design achieves automatic function switching with simple components, reducing the overall circuit cost. At the same time, the use of fewer components makes the circuit smaller and easier to install in the ringing module 20.

[0036] In some embodiments, such as Figure 4 As shown, the first power supply terminal 11 of the doorbell control circuit 10 is a positive power supply terminal, the second power supply terminal 12 is a negative power supply terminal, the first input terminal is a positive input terminal, the second input terminal is a negative input terminal, the switching transistor Q1 is a P-type transistor, the anode of the Zener diode D4 is electrically connected to the negative power supply terminal 12, and the cathode of the Zener diode D4 is electrically connected to the other end of the third resistor R4.

[0037] In this embodiment, the first power supply terminal 11 serves as the positive input, and the second power supply terminal 12 serves as the negative input, forming a complete current loop. When the doorbell module 30 is rang, it short-circuits, its resistance decreases, and the voltage drop decreases. This increases the voltage drop across the ringing module 20 and the doorbell control circuit 10, i.e., the voltage between the first power supply terminal 11 and the second power supply terminal 12. Consequently, the voltage at the voltage divider of the voltage divider circuit 131 increases. However, due to the Zener diode D4 being grounded at its anode and connected to the third resistor R4 at its cathode, the voltage at the regulated output of the reference voltage circuit 133 remains unchanged, resulting in a voltage drop across the voltage divider that is greater than the reference voltage. The first input of the comparator 132 is a positive input, and the second input is a negative input. When the voltage at the voltage divider is greater than the reference voltage, i.e., the positive input voltage is greater than the negative input voltage, the output signal is a high-level signal. This controls the switch Q1 to turn off, increasing the resistance of the doorbell control circuit 10 and thus reducing its current. This allows the ringing module 20 to receive a sufficiently large current to trigger the ringing. When the doorbell is not rang (i.e., when the doorbell is reset), the doorbell module 30 is not short-circuited, its resistance is relatively large, and the voltage drop is relatively large. The voltage drop of the ringing module 20 and the doorbell control circuit 10 is relatively small, that is, the voltage between the first power supply terminal 11 and the second power supply terminal 12 is relatively small. Consequently, the voltage at the voltage divider terminal of the voltage divider circuit 131 is relatively small. However, due to the setting of the Zener diode D4, the voltage at the regulated output terminal of the reference voltage circuit 133 remains unchanged, so the voltage at the voltage divider terminal is less than or equal to the reference voltage. The voltage at the positive input terminal of the comparator 132 is less than or equal to the voltage at the negative input terminal, and the output signal is a low-level signal. This controls the switch Q1 to conduct, which reduces the resistance of the doorbell control circuit 10, thereby increasing its current. This allows the doorbell module 30 to obtain increased current or operate in constant power mode, and the current shunt of the ringing module 20 is reduced, putting it in a non-ringing state.

[0038] In other embodiments, an N-type switching transistor can be used, with the negative input of the comparator serving as the first input, electrically connected to the voltage divider of the voltage divider circuit, and the positive input serving as the second input connected to the reference voltage. When the doorbell is pressed, the voltage at the voltage divider is greater than the reference voltage, and the comparator outputs a low-level signal to control the N-type transistor to turn off; when the doorbell is not pressed, the voltage at the voltage divider is lower than the reference voltage, and the comparator outputs a high-level signal to control the N-type transistor to turn on.

[0039] By setting the polarity of the Zener diode D4 in conjunction with the input of the comparator 132 and the control logic of the switching transistor Q1, the doorbell button status can be identified and the resistance of the doorbell control circuit 10 can be changed. The circuit function is realized by using simple comparison and control logic, which reduces the overall cost. The use of a small number of components makes the circuit smaller and easier to install in the ringing module 20.

[0040] In some embodiments, such as Figure 3 and 4As shown, the doorbell control circuit 10 further includes a rectifier circuit 15, electrically connected to the first power supply terminal 11 and the second power supply terminal 12, used to convert AC signals into DC signals and supply them to the first power supply terminal 11 and the second power supply terminal 12; wherein, the rectifier circuit 15 is configured to be electrically connected to the two power supply terminals of the ringing module 20. In a specific implementation, a full-bridge rectifier structure D2 composed of four diodes can be used, or an integrated rectifier module can be used.

[0041] The rectifier circuit 15 allows the doorbell control circuit 10 to receive an AC signal, improving the circuit's adaptability.

[0042] In other embodiments, a rectifier circuit may be omitted to provide a DC signal to the doorbell control circuit.

[0043] This application further proposes a doorbell system, such as Figure 5 As shown, it includes: a ringing module 20, a doorbell module 30, and the aforementioned doorbell control circuit 10. The ringing module 20 and the doorbell module 30 are connected in series in the power supply circuit, and the doorbell control circuit 10 is connected in parallel with the ringing module 20.

[0044] In this embodiment, the doorbell control circuit 10 and the ringing module 20 are connected in parallel, and the doorbell control circuit 10 and the doorbell module 30 are connected in series. This allows the doorbell module 30 to short-circuit when the doorbell is pressed, increasing the resistance of the doorbell control circuit 10 through its resistance adjustment mechanism, thereby decreasing its current and increasing the current to the ringing module 20, triggering the ringing. Conversely, when the doorbell is not pressed, the resistance of the doorbell control circuit 10 decreases, causing its current to increase, reducing the current shunt to the ringing module 20 and preventing it from ringing. This ensures that when the doorbell is not pressed, the resistance of the doorbell control circuit 10 decreases through its resistance adjustment mechanism, allowing the doorbell module 30 to draw a large power supply or operate in a constant power mode. For a detailed explanation of the principle, please refer to the above embodiment.

[0045] In some embodiments, when the doorbell module 30 in the doorbell system is rang, it is short-circuited to increase the supply voltage across the doorbell control circuit 10 and the ringing module 20. The result signal output by the voltage comparison circuit 13 controls the switch circuit 14 to turn off, thereby increasing the resistance of the doorbell control circuit 10 and causing its current to decrease, thus increasing the supply current of the ringing module 20 and triggering the ringing.

[0046] In some embodiments, when the doorbell module 30 in the doorbell system is not rang, the switch circuit 14 is in the conducting state, so that the resistance of the doorbell control circuit 10 decreases, thereby causing its current to increase, so that the doorbell module 30 draws a large power or operates in the constant power mode, and the current shunt of the ringing module 20 is reduced, and it is in the non-ringing state.

[0047] In some embodiments, such as Figure 5 As shown, the doorbell system also includes a power supply circuit (not shown), connected in series in the power supply circuit, to power the doorbell control circuit 10, the ringing module 20, and the doorbell module 30, ensuring the normal operation of each module. In specific implementations, the power supply circuit can be an AC power supply or a DC power supply.

[0048] The above description is merely an embodiment of this application and does 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 doorbell control circuit for a doorbell system, the doorbell system comprising a ringing module and a doorbell module connected in series in a power supply circuit, characterized in that, The doorbell system further includes a doorbell control circuit connected in parallel with the ringing module, wherein the doorbell control circuit includes: The first power supply terminal and the second power supply terminal are electrically connected to the two power supply terminals of the ringing module, respectively. A voltage comparison circuit is connected between the first power supply terminal and the second power supply terminal, and is used to compare the power supply voltage of the ringing module with the reference voltage and output the result signal. A switching circuit is connected between the first power supply terminal and the second power supply terminal, and is electrically connected to the voltage comparison circuit. The switching circuit switches on and off based on the result signal. When the doorbell module is pressed, it is short-circuited, and the switch circuit is in the off state to increase the resistance of the doorbell control circuit; when the doorbell module is not pressed, the switch circuit is in the on state to decrease the resistance of the doorbell control circuit.

2. The doorbell control circuit according to claim 1, characterized in that, The voltage comparison circuit includes: A voltage divider circuit is connected between the first power supply terminal and the second power supply terminal; The comparator has its first input terminal electrically connected to the voltage divider terminal of the voltage divider circuit, its second input terminal connected to the reference voltage, and its output terminal electrically connected to the switching circuit.

3. The doorbell control circuit according to claim 2, characterized in that, The voltage comparison circuit further includes: A reference voltage circuit is connected between the first power supply terminal and the second power supply terminal, and the regulated output terminal of the reference voltage circuit is electrically connected to the second input terminal of the comparator.

4. The doorbell control circuit according to claim 2, characterized in that, The voltage divider circuit includes: A first resistor, one end of which is electrically connected to the first power supply terminal, and the other end of which serves as the voltage divider terminal; The second resistor has one end electrically connected to the other end of the first resistor, and the other end of the second resistor is electrically connected to the second power supply terminal.

5. The doorbell control circuit according to claim 3, characterized in that, The reference voltage circuit includes: The third resistor has one end electrically connected to the first power supply terminal, and the other end of the third resistor serves as the regulated output terminal. A Zener diode, one end of which is electrically connected to the other end of the third resistor, and the other end of which is electrically connected to the second power supply terminal.

6. The doorbell control circuit according to claim 5, characterized in that, The switching circuit includes: A fourth resistor, one end of which is electrically connected to the first power supply terminal; The fifth resistor, one end of which is electrically connected to the output terminal of the comparator; The switching transistor has its control terminal electrically connected to the other end of the fifth resistor, its first conducting terminal electrically connected to the other end of the fourth resistor, and its second conducting terminal electrically connected to the second power supply terminal.

7. The doorbell control circuit according to claim 6, characterized in that, The first power supply terminal is a positive power supply terminal, the second power supply terminal is a negative power supply terminal, the first input terminal is a positive input terminal, the second input terminal is a negative input terminal, the switching transistor is a P-type transistor, the anode of the Zener diode is electrically connected to the negative power supply terminal, and the cathode of the Zener diode is electrically connected to the other end of the third resistor.

8. The doorbell control circuit according to claim 1, characterized in that, The doorbell control circuit also includes: A rectifier circuit, electrically connected to the first power supply terminal and the second power supply terminal, is used to convert AC signals into DC signals and supply them to the first power supply terminal and the second power supply terminal. The rectifier circuit is configured to be electrically connected to the two power supply terminals of the ringing module.

9. A doorbell system, characterized in that, The doorbell system includes: The ringing module, the doorbell module, and the doorbell control circuit according to any one of claims 1 to 8, wherein the ringing module and the doorbell module are connected in series in the power supply circuit, and the doorbell control circuit is connected in parallel with the ringing module.

10. The doorbell system according to claim 9, characterized in that, The doorbell system also includes: A power supply circuit is connected in series in the power supply circuit to supply power to the doorbell control circuit, the ringing module, and the doorbell module.

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