WO2022183859A1

WO2022183859A1 - Doorbell camera

Info

Publication number: WO2022183859A1
Application number: PCT/CN2022/072738
Authority: WO
Inventors: 叶蔚然
Original assignee: 杭州海康威视数字技术股份有限公司
Priority date: 2021-03-05
Filing date: 2022-01-19
Publication date: 2022-09-09
Also published as: CN112954277A; CN112954277B

Abstract

A doorbell camera. The doorbell camera comprises a power supply end, a mechanical doorbell, a camera circuit, a charging capacitor, and a control circuit. The power supply end is used for being connected to a power supply. The control circuit comprises a linked switch and a controller; the camera circuit, the charging capacitor, and the linked switch are connected in parallel to the power supply end; the mechanical doorbell and the linked switch are connected in series to the power supply end; and the controller is connected to the linked switch and used for controlling the on/off of the linked switch. When the linked switch is switched on, the power supply end is used for supplying power to the mechanical doorbell to make the mechanical doorbell sound, and the charging capacitor is used for supplying power to the camera circuit; and when the linked switch is switched off, the power supply end is used for charging the charging capacitor by means of the mechanical doorbell and supplying power to the camera circuit, and the mechanical doorbell does not make a sound.

Description

doorbell camera

This application claims the priority of the Chinese patent application with the application number 202110247368.8 and the invention titled "doorbell camera", which was filed with the China Patent Office on March 05, 2021, the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the field of electric bells, and in particular, to a doorbell camera.

Background technique

Now, some doorbells are equipped with cameras. When a visitor calls the door through the doorbell, the camera can take pictures of the visitor or collect video images including the visitor, so that people in the house can identify the visitor according to the photographed or video images. safety. However, the cost of such doorbells with cameras has yet to be reduced.

SUMMARY OF THE INVENTION

The present application provides an improved doorbell camera with lower cost.

According to one aspect, a doorbell camera is provided, comprising:

The power supply terminal is used to connect with the power supply;

mechanical doorbell;

camera circuit;

a charging capacitor, electrically connected to the power supply terminal and the camera circuit;

A control circuit includes a linkage switch and a controller, the camera circuit, the charging capacitor and the linkage switch are connected in parallel to the power supply end, and the mechanical doorbell and the linkage switch are connected in series to the power supply end, so The controller is connected with the linkage switch, and is used to control the on-off of the linkage switch; when the linkage switch is connected, the power supply terminal is used to supply power to the mechanical doorbell, so that the mechanical doorbell emits sound, so the The charging capacitor is used to supply power to the camera circuit; when the linkage switch is turned off, the power supply terminal is used to charge the charging capacitor and supply power to the camera circuit through the mechanical doorbell, and the mechanical doorbell does not work. Make noise.

According to a second aspect, a doorbell camera is provided, comprising:

The power supply terminal is used to connect with the power supply;

switch circuits, including doorbell switches;

mechanical doorbell;

camera circuit;

charging capacitor;

A control circuit, including a linkage switch, a power conversion circuit, a charging circuit and a controller, the mechanical doorbell is respectively connected in series with the linkage switch and the power conversion circuit to the power supply terminal, and the linkage switch and the power conversion The circuits are connected in parallel; the power conversion circuit includes a conversion output terminal, the charging capacitor is connected to the conversion output terminal through the charging circuit, the camera circuit is connected to the conversion output terminal, and the controller is respectively connected to the conversion output terminal. The doorbell switch and the linkage switch, the controller is configured to:

When a first electrical signal indicating that the doorbell switch is closed is detected, a first control signal is output to control the linkage switch to be connected, so that the power supply terminal supplies power to the mechanical doorbell, so that the mechanical doorbell emits a sound, so The charging capacitor is used to supply power to the camera circuit;

When a second electrical signal indicating that the doorbell switch is disconnected is detected, a second control signal is output to control the linkage switch to be disconnected, so that the power supply terminal supplies power to the power conversion circuit through the mechanical doorbell, so that the After the power conversion circuit converts the voltage output by the power supply, it is output through the conversion output terminal to supply power to the camera circuit, and the charging capacitor is charged through the charging circuit.

In some embodiments of the present application, the doorbell camera includes a mechanical doorbell, a camera circuit, a charging capacitor, and a control circuit, the control circuit includes a linkage switch and a controller, the camera circuit is connected in parallel with the linkage switch, the mechanical doorbell is connected in series with the linkage switch, and the charging capacitor Connected to the camera circuit, when the doorbell camera is triggered, the controller can control the linkage switch to connect, so that the linkage switch short-circuits the camera circuit, making the mechanical doorbell work, and the charging capacitor can supply power to the camera circuit to ensure the normal operation of the camera circuit. Using a charging capacitor to power the camera circuit, the cost can be lower, and thus the cost of the doorbell camera is lower.

Description of drawings

In order to more clearly illustrate the embodiments of the present application and the technical solutions of the prior art, the following briefly introduces the drawings required in the embodiments and the prior art. Obviously, the drawings in the following description are only the For some embodiments of the application, those of ordinary skill in the art can also obtain other drawings according to these drawings.

1 is a schematic diagram of the principle of a doorbell camera provided by an embodiment of the present application;

Fig. 2 is the circuit diagram of the doorbell camera in Fig. 1;

FIG. 3 is a schematic diagram of the mechanical doorbell of the doorbell camera in FIG. 2 .

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and examples. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application fall within the protection scope of the present application.

FIG. 1 is a schematic diagram of the principle of a doorbell camera 100 provided by an embodiment of the present application. Referring to FIG. 1 , a doorbell camera 100 includes a mechanical doorbell 12 and a camera circuit 13 . In some embodiments, the mechanical doorbell 12 may be used to sound an alert sound, such as a ding-dong sound, when a visitor presses or touches the doorbell camera 100 . The camera circuit 13 can be used to take photos or collect video images, so that people in the house can identify visitors according to the photos or video images, thereby improving security. The camera circuit 13 may include an IP (Internet Protocol Address) network camera, an analog camera, and the like.

In some embodiments, the doorbell camera 100 includes a power supply terminal 11 , a charging capacitor 14 and a control circuit 15 . The power supply terminal 11 is used for connecting with the power supply 19 , and includes a first power supply terminal 111 and a second power supply terminal 112 . The first power supply terminal 111 and the second power supply terminal 112 are respectively connected to two ends of the power supply 19 , so that the power supply 19 can supply power to the doorbell camera 100 through the power supply terminal 11 . In this embodiment, the power supply 19 includes an AC power supply, for example, an 8V-24V AC power supply, or may also include a DC (Direct Current) power supply, the first power supply terminal 111 is connected to the live wire L of the power supply 19, and the second power supply The terminal 112 is connected to the neutral line N of the power supply 19 . In other embodiments, the power supply 19 includes a DC power supply, such as a battery, the first power supply terminal 111 is connected to the positive pole of the power supply 19 , and the second power supply terminal 112 is connected to the negative pole of the power supply 19 .

In some embodiments, the charging capacitor 14 is electrically connected to the power supply terminal 11 and the camera circuit 13 . The power supply 19 can charge the charging capacitor 14 through the power supply terminal 11 . The electrical energy stored in the charging capacitor 14 can be used to power the camera circuit 13 . The charging capacitor 14 may comprise a super capacitor. The super capacitor is a green and environment-friendly power source, does not pollute the environment, and has a simple charging and discharging circuit, which is beneficial to reducing the volume of the doorbell camera 100 .

In some embodiments, the control circuit 15 includes a linkage switch 151 and a controller 152 . The controller 152 is connected to the linkage switch 151 for controlling the on-off of the linkage switch 151 . The controller 152 can control the linkage switch 151 to connect when the visitor presses or touches the doorbell camera 100 ; and controls the linkage switch 151 to disconnect when the visitor stops pressing or touching the doorbell camera 100 .

In some embodiments, doorbell camera 100 includes doorbell switch 16 . The doorbell switch 16 is used to press or touch the visitor. The doorbell switch 16 can be turned on when pressed or touched, and turned off when not pressed or touched. The controller 152 is connected to the doorbell switch 16 for detecting the on-off of the doorbell switch 16 and controlling the on-off of the linkage switch 151 according to the on-off of the doorbell switch 16 . In this embodiment, the controller 152 can detect different electrical signals respectively when the doorbell switch 16 is connected and when the doorbell switch 16 is not connected. For example, the controller 152 may detect a low level when the doorbell switch 16 is on, and detect a high level when the doorbell switch 16 is off. When the controller 152 detects an electrical signal (eg, low level) indicating that the doorbell switch 16 is connected, it controls the linkage switch 151 to connect; when it detects an electrical signal (eg, a high level) indicating that the doorbell switch 16 is disconnected, it controls the linkage switch 151 disconnect.

In some embodiments, the camera circuit 13 , the charging capacitor 14 and the linkage switch 151 are connected to the power supply terminal 11 in parallel, and the mechanical doorbell 12 and the linkage switch 151 are connected to the power supply terminal 11 in series. When the linkage switch 151 is connected (that is, when the doorbell switch 16 is connected due to being pressed or touched), the power supply terminal 11 is used to supply power to the mechanical doorbell 12 to make the mechanical doorbell 12 emit sound. In some embodiments, when the linkage switch 151 is connected, the linkage switch 151 short-circuits the camera circuit 13 and the charging capacitor 14 , and the mechanical doorbell 12 and the linkage switch 151 form a current path. At least most of the voltage of the power supply 19 is applied to both ends of the mechanical doorbell 12, so that the voltage across the mechanical doorbell 12 is sufficient to drive the mechanical doorbell 12 to work, and the mechanical doorbell 12 emits a prompting sound. When the mechanical doorbell 12 is working, the charging capacitor 14 can be used to supply power to the camera circuit 13, so that the camera circuit 13 can work normally, and the camera circuit 13 can take pictures or collect video images.

In some embodiments, when the linkage switch 151 is disconnected (ie, the doorbell switch 16 is disconnected without being pressed or touched), the power supply terminal 11 is used to charge the charging capacitor 14 through the mechanical doorbell 12 and supply the camera circuit 13 And the mechanical doorbell 12 is powered, and the mechanical doorbell 12 does not make a sound. In some embodiments, when the linkage switch 151 is turned off, the mechanical doorbell 12 and the camera circuit 13 form a current path, and the voltage applied to both ends of the mechanical doorbell 12 is reduced, so that the voltage across the mechanical doorbell 12 is insufficient to drive the mechanical doorbell 12 to work. The mechanical doorbell 12 stops playing the prompt sound, that is, the mechanical doorbell 12 does not make a sound, and the electric energy of the power supply 19 received by the power supply terminal 11 charges the charging capacitor 14 and supplies power to the camera circuit 13, so that the linkage switch 151 is connected and the camera circuit is short-circuited. At 13:00, the electrical energy stored in the charging capacitor 14 can supply power to the camera circuit 13 . In some embodiments, the controller 152 can be connected to the charging capacitor 14 for detecting the voltage of the charging capacitor 14. When the linkage switch 151 is connected (the charging capacitor 14 is discharged), if the controller 152 detects that the voltage of the charging capacitor 14 is low When the threshold value is reached, the linkage switch 151 can be controlled to be disconnected, and the charging capacitor 14 can be charged in time to ensure the normal operation of the camera circuit 13 .

In some embodiments, the doorbell camera 100 of the present application includes a mechanical doorbell 12 , a camera circuit 13 , a charging capacitor 14 and a control circuit 15 , the control circuit 15 includes a linkage switch 151 and a controller 152 , and the camera circuit 13 is connected in parallel with the linkage switch 151 , the mechanical doorbell 12 is connected in series with the linkage switch 151, the charging capacitor 14 is connected with the camera circuit 13, the controller 152 can control the linkage switch 151 to connect, so that the linkage switch 151 short-circuits the camera circuit 13, and then makes the mechanical doorbell 12 work. When the camera circuit 13 is short-circuited, the charging capacitor 14 can supply power to the camera circuit 13 to ensure the normal operation of the camera circuit 13 . The doorbell camera 100 of the present application supplies power to the camera circuit 13 through the charging capacitor 14. Compared with some doorbells that supply power to the camera circuit 13 through a battery, on the one hand, the cost of the charging capacitor 14 is lower, and the charging and discharging circuit of the charging capacitor 14 is relatively simple. The corresponding circuit cost is lower. As such, the cost of using the charging capacitor 14 may be lower, and thus the cost of the doorbell camera 100 may be lower. On the other hand, since the charging and discharging circuit of the charging capacitor 14 is relatively simple, the structure of the doorbell camera 100 can be relatively simple and the volume is small. On the other hand, compared with the battery, the charging capacitor 14 has stronger applicability and more stable performance. For example, some special occasions may not allow the battery exceeding the threshold capacity to enter, resulting in limited use of the doorbell in these special occasions, while the charging capacitor 14 is not subject to relevant restrictions, so the doorbell camera 100 is more applicable. For another example, in a low temperature environment, the energy storage of the battery will be greatly reduced, which may lead to insufficient power supply of the camera circuit in the related art, and the camera cannot work normally. The energy storage of the capacitor 14 is not limited by environments such as low temperature, so that the doorbell camera 100 works normally in a low temperature environment, and the performance of the doorbell camera 100 is more stable. On the other hand, for traditional doorbells (including mechanical doorbells, but not including camera circuits), the doorbell camera 100 of the present application can retain the circuit wiring method of the traditional doorbells, and add a camera circuit 13 on the basis of the traditional doorbell circuits, so that the product continuity is relatively high. Well, the upgrade is more convenient and reduces the R&D cost.

Continuing to refer to FIG. 1 , in some embodiments, camera circuit 13 includes camera function circuit 1311 and camera system power supply 1312 . The camera function circuit 1311 includes function block circuits of the camera circuit 13, such as a wireless function circuit, an image sensor circuit, and the like. The controller 152 can be connected to the camera function circuit 1311 for controlling the camera function circuit 1311 to work. The camera system power supply 1312 includes a power supply input terminal IN1 and a power supply output terminal OUT1, the power supply input terminal IN1 is connected to the power supply terminal 11 and the charging capacitor 14, and the power supply output terminal OUT1 is connected to the camera function circuit 1311 and the controller 152. The voltage input by the power supply input terminal IN1 is converted into the working voltage of the camera function circuit 1311 to supply power to the camera function circuit 1311 and the controller 152 . In some embodiments, when the linkage switch 151 is connected and the mechanical doorbell 12 is working, the camera system power supply 1312 can convert the voltage input from the charging capacitor 14 through the power supply input terminal IN1 to the working voltage of the camera function circuit 1311 and the controller 152; linkage When the switch 151 is turned off and the mechanical doorbell 12 stops working, the camera system power supply 1312 can convert the voltage input by the power supply 19 through the power supply terminal 11 and the power supply input terminal IN1 into the working voltage of the camera function circuit 1311 and the controller 152 .

In some embodiments, the operating voltages of the functional module circuits of the camera circuit 13 may be different, and the camera system power supply 1312 converts the voltages input through the power supply input terminal IN1 into different voltages, such as 3.3 volts, 1.8 volts, and 1.9 volts, respectively. etc., respectively supply power to each functional module circuit of the camera circuit 13 . The camera system power supply 1312 may include a plurality of power supply output terminals OUT1. Different power supply output terminals OUT1 output different voltages. Each functional module circuit of the camera circuit 13 is respectively connected to different power supply output terminals OUT1.

In some embodiments, when the linkage switch 151 is turned off and the power supply 19 supplies power to the camera circuit 13 through the power supply terminal 11, after the power supply voltage of each functional module circuit of the camera circuit 13 reaches the required voltage, the camera system power supply 1312 The control power supply 19 charges the charging capacitor 14 . In this way, when the camera system power supply 1312 is not fully activated, the charging current of the charging capacitor 14 is too large, which affects the startup of the camera system power supply 1312 and causes the power supply voltage of at least some functional module circuits of the camera circuit 13 to fail to reach the required voltage. Influence the normal operation of the camera circuit 13 .

In some embodiments, the control circuit 15 includes a charging circuit 153, which is connected between the power supply terminal 11 and the charging capacitor 14 for charging the charging capacitor 14; the camera system power supply 1312 is connected to the charging circuit 153 for charging the charging capacitor 14; Controls whether the charging circuit 153 starts to work. The camera system power supply 1312 can control the power supply 19 to charge the charging capacitor 14 by controlling whether the charging circuit 153 starts to work. Specifically, the camera system power supply 1312 can control the charging circuit 153 to start working to charge the charging capacitor 14 after the power supply voltage of each functional module circuit of the camera circuit 13 reaches the required voltage. After the charging circuit 153 starts to work, the power supply 19 charges the charging capacitor 14 through the power supply terminal 11 and the charging circuit 153 . In some embodiments, the charging circuit 153 may further control the charging of the charging capacitor 14 , for example, after the charging of the charging capacitor 14 is completed, the charging circuit 153 may stop charging the charging capacitor 14 .

In some embodiments, the control circuit 15 includes a first diode D262, the anode of the first diode D262 is connected to the power supply terminal 11, and the cathode of the first diode D262 is connected to the power supply input terminal IN1 of the camera system power supply 1312. The first diode D262 can prevent the current from flowing from the camera system power supply 1312 to the power supply 19 to charge the power supply 19 in the reverse direction, and at the same time, it can also prevent the power loss caused by the reverse current.

In some embodiments, the control circuit 15 includes a second diode D272 , the anode of the second diode D272 is connected to the power supply terminal 11 , and the cathode of the second diode D272 is connected to the charging circuit 153 . The second diode D272 can prevent the current from flowing from the charging capacitor 14 to the power source 19 and charge the power source 19 in the reverse direction, and at the same time, it can also prevent the power loss caused by the reverse current.

In some embodiments, the control circuit 15 includes a third diode D282 , the anode of the third diode D282 is connected to the charging capacitor 14 , and the cathode of the third diode D282 is connected to the power input terminal IN1 of the camera system power supply 1312 . The third diode D282 can prevent the camera system power supply 1312 from charging the charging capacitor 14 in the reverse direction, and at the same time, can also prevent the power loss caused by the reverse current.

In some embodiments, the control circuit 15 includes a power conversion circuit 154, and the power conversion circuit 154 is connected between the power supply terminal 11 and the power supply input terminal IN1 of the camera system power supply 1312, and between the power supply terminal 11 and the charging circuit 153, It is used to convert the alternating current output from the power supply 19 into direct current to supply power to the camera circuit 13 and charge the charging capacitor 14 . The power conversion circuit 154 can convert the strong alternating current into weak direct current, such as 5.2 volts, and output the weak direct current to supply power to the camera circuit 13 and charge the charging capacitor 14 . In this way, the unconverted current is prevented from being too large to damage the camera circuit 13 and the charging capacitor 14 .

FIG. 2 is a circuit diagram of the doorbell camera 100 in FIG. 1 . Referring to FIG. 2 , in some embodiments, the doorbell camera 100 includes a switch circuit 17 , and the switch circuit 17 includes a first resistor RT1 , a second resistor RT2 and a switch detection power supply 171 . The controller 152 includes a detection terminal BELL_BUTTON. The first resistor RT1 and the doorbell switch 16 are connected in series between the switch detection power supply 171 and the ground, and the detection terminal BELL_BUTTON is connected between the first resistor RT1 and the doorbell switch 16 through the second resistor RT2. The doorbell switch 16 is connected when pressed or touched, the detection terminal BELL_BUTTON is grounded through the second resistor RT2, and a low level (switch trigger signal of the doorbell switch 16) is detected; the doorbell switch 16 is disconnected when it is not pressed or touched , the detection terminal BELL_BUTTON is connected to the switch detection power supply 171 through the first resistor RT1 and the second resistor RT2, and a high level (switch release signal of the doorbell switch 16) is detected. The controller 152 determines whether the doorbell switch 16 is on or off (ie, whether the doorbell switch 16 is pressed or touched) according to the level signal detected by the detection terminal BELL_BUTTON. The duration of the low level is the duration of the doorbell switch 16 being pressed or touched.

In some embodiments, the controller 152 includes a control terminal BELL_CTL. When the controller 152 detects that the doorbell switch 16 is pressed or touched through the detection terminal BELL_BUTTON, it controls the linkage switch 151 to be connected through the control terminal BELL_CTL. In this embodiment, the linkage switch 151 includes a thyristor Q1. The control terminal BELL_CTL is connected to the control pole of the thyristor Q1, the first pole T1 of the thyristor Q1 is connected to the live wire L of the power supply 19 (see FIG. 1 ) through the mechanical doorbell 12, and the second pole T2 of the thyristor Q1 is connected to the power supply 19 The neutral line N is connected. The camera circuit 13 is connected in parallel with the thyristor Q1 through the power conversion circuit 154 . When the doorbell switch 16 is pressed or touched, the controller 152 controls the thyristor Q1 to conduct through the control terminal BELL_CTL, the power conversion circuit 154 and its subsequent circuits are short-circuited, and the mechanical doorbell 12 works. The controller 152 can work according to the duration of the mechanical doorbell 12. During this duration, the control terminal BELL_CTL continuously outputs an electrical signal (for example, a high level) that turns on the thyristor Q1. In this way, the thyristor Q1 can be prevented from The problem that the mechanical doorbell 12 cannot work due to the automatic disconnection when the AC zero crosses. When the doorbell switch 16 is not pressed or touched, the controller 152 no longer outputs the electrical signal to turn on the thyristor Q1 through the control terminal BELL_CTL. turn on again.

FIG. 3 is a schematic diagram of the mechanical doorbell 12 of FIG. 2 . Referring to FIG. 3 , the mechanical doorbell 12 includes a coil 121 , an electromagnet 122 , a doorbell hammer 123 , an elastic device 125 and a baffle 124 (also referred to as a tone bar). The doorbell hammer 123 is arranged between the electromagnet 122 and the baffle 124 , and the coil 121 is connected in series between the live wire L and the neutral wire N of the power supply 19 . When the linkage switch 151 is turned on, the coil 121 is energized, the electromagnet 122 generates magnetism, attracts the doorbell hammer 123, and the doorbell hammer 123 hits the electromagnet 122 to emit a first sound (eg "ding"), and at the same time, the elastic device 125 compresses. When the linkage switch 151 is turned off, the voltage on the coil 121 is low, the current is small, the magnetism generated by the electromagnet 122 is not enough to attract the doorbell hammer 123, the doorbell hammer 123 is released, and under the action of the elastic device 125, it hits the baffle 124. A second sound (eg, "dong") may be produced. In this way, a complete doorbell (eg "ding dong") is formed. In some embodiments, the controller 152 may control the linkage switch 151 to be turned on when it is detected that the doorbell switch 16 is turned on, so as to control the sound effect duration of the mechanical doorbell 12 . The sound effect duration of the mechanical doorbell 12 is consistent with the conduction duration of the doorbell switch 16 . The conduction duration of the doorbell switch 16 is different (the duration of the doorbell switch 16 being pressed is different), resulting in different doorbell sound effects.

Continuing to refer to FIG. 2 , in some embodiments, control circuit 15 includes isolation circuit 155 . The isolation circuit 155 is connected between the controller 152 and the linkage switch 151 , and the controller 152 is used to control the on-off of the linkage switch 151 by controlling the isolation circuit 155 . The isolation circuit 155 is used to isolate the strong current circuit where the linkage switch 151 is located and the weak current circuit where the controller 152 is located, so as to protect the controller 152 and prevent the weak current circuit where the controller 152 is located from being connected to strong current, causing damage to the controller 152. damage. In this embodiment, the isolation circuit 155 is connected between the controller 152 and the control electrode of the thyristor Q1. The isolation circuit 155 includes an optocoupler OP1 and an isolated power supply 1551. The optocoupler OP1 is connected between the control terminal BELL_CTL of the controller 152 and the control electrode of the thyristor Q1, and is connected to the isolated power supply 1551. The controller 152 can control the thyristor Q1 to be turned on or off by controlling the on-off of the photocoupler OP1. In some embodiments, the control circuit 15 includes a transistor Q2, the base of the transistor Q2 is connected to the control terminal BELL_CTL of the controller 152, and one of the collector and the emitter of the transistor Q2 is connected to the optocoupler OP1, and is connected to the optocoupler OP1 through the optoelectronic The coupler OP1 is connected to the isolated power supply 1551, and the other one of the collector and the emitter of the transistor Q2 is grounded. The controller 152 controls the on-off of the optocoupler OP1 by controlling the on-off of the transistor Q2.

In some embodiments, the isolation circuit 155 includes a third resistor R31 and a fourth resistor R32. One end of the third resistor R31 is connected to the isolated power supply 1551, and the other end of the third resistor R31 is connected to the optocoupler OP1, which can be connected to the optocoupler OP1. Perform current limiting to prevent the photocoupler OP1 from being damaged due to excessive current. One end of the fourth resistor R32 is connected to the control terminal BELL_CTL of the controller 152, and the other end of the fourth resistor R32 is connected to the base of the transistor Q2. The fourth resistor R32 can limit the base current of the transistor Q2 to prevent the base of the transistor Q2. The pole current is too large, and the transistor Q2 is damaged.

In some embodiments, the power conversion circuit 154 includes an overcurrent protection device F1, a rectifier DB2, a step-down capacitor CP1, filter capacitors C220, C3, and a surge protector U19. The rectifier DB2 is respectively connected to the live wire L and the neutral wire N of the power source 19, and is used for converting the AC power output by the power source 19 into DC power. The step-down capacitor CP1 is connected to the rectifier DB2, and is used for step-down of the DC voltage output by the rectifier DB2, so as to output the DC weak current to supply power to the camera circuit 13 and the controller 152. The filter capacitors C220, C3 and the surge protector U19 are connected to the rectifier (ie, the rectifier DB2) in parallel with the step-down capacitor CP1. The filter capacitors C220 and C3 are used to filter the DC weak current output by the power conversion circuit 154 to improve voltage stability. The surge protector U19 can perform surge protection on the power conversion circuit 154 and the circuit components of the subsequent circuits, so as to prevent the circuit components from being damaged by the surge signal generated in the circuit. The overcurrent protection device F1 is connected in series between the live wire L of the power supply 19 and the rectifier DB2, and is used for overcurrent protection of the power conversion circuit 154 and subsequent circuits.

In this embodiment, the control circuit 15 includes a wide-voltage DC circuit 156 , and the wide-voltage DC circuit 156 is connected to the power conversion circuit 154 , and is used for the input voltage required by the power supply input terminal IN1 of the camera system power supply 1312 and the charging capacitor 14 . To obtain the required charging voltage, convert the voltage converted and output by the power conversion circuit 154 into a voltage that meets the requirements (for example, 5.2 volts), so that the voltage converted and output by the wide-voltage DC circuit 156 passes through the first diode D262 or the second diode D262. After D272, the voltage input to the camera system power supply 1312 through the power input terminal IN1 is the required input voltage (eg, 5 volts), or the charging voltage required by the charging capacitor 14 (eg, 5 volts). In other embodiments, if the output voltage of the power conversion circuit 154 is a required voltage (for example, 5.2 volts), the wide-voltage DC circuit 156 does not need to be provided.

In some embodiments, the camera system power supply 1312 includes a charging control terminal CAP_EN, and the charging control terminal CAP_EN is connected to the charging circuit 153 . After the power supply voltage of each functional circuit module of the camera functional circuit 1311 reaches the required voltage, the camera system power supply 1312 controls the charging circuit 153 to start working through the charging control terminal CAP_EN.

In this embodiment, the charging circuit 153 includes a charging chip UP1. The charging chip UP1 is connected to the charging capacitor 14 and is used to control the charging of the charging capacitor 14 . The charging chip UP1 includes a charging enable terminal ENUV. The camera system power supply 1312 is connected to the charging enable terminal ENUV of the charging chip UP1 through the charging control terminal CAP_EN. After the power supply voltage of each functional circuit module of the camera functional circuit 1311 reaches the required voltage, the camera system power supply 1312 passes through the charging control terminal. CAP_EN sends a control signal indicating that charging is started to the charging chip UP1 , so that the charging chip UP1 can charge the charging capacitor 14 . In some embodiments, the charging circuit 153 includes a fifth resistor R34 and a sixth resistor R33, the fifth resistor R34 is connected in series between the charging control terminal CAP_EN and the charging enable terminal ENUV, and the sixth resistor R33 is connected in series between the charging enable terminal between the terminal ENUV and the wide voltage DC circuit 156 .

In some embodiments, the charging chip UP1 includes a charging input terminal IN and a charging output terminal OUT, and the charging input terminal IN is connected to the wide-voltage DC circuit 156 through the second diode D272. The anode of the second diode D272 is connected to the wide voltage DC circuit 156 , and the cathode of the second diode D272 is connected to the charging input terminal IN to prevent current from flowing from the charging chip UP1 to the wide voltage DC circuit 156 . The charging output terminal OUT is connected to the charging capacitor 14 . The voltage converted and output by the wide-voltage DC circuit 156 is input to the charging chip UP1 through the second diode D272, and the charging capacitor 14 is charged by the charging chip UP1.

In some embodiments, the charging circuit 153 includes a first capacitor C31 and a second capacitor C32. The first capacitor C31 and the second capacitor C32 are connected in parallel between the charging input terminal IN and the ground, and can filter the voltage output by the wide voltage DC circuit 156 to the charging chip UP1 to ensure that the signal received by the charging chip UP1 is more stable.

In some embodiments, the charging circuit 153 includes a charging resistor RP8, and the charging resistor RP8 is connected to the current limiting threshold adjustment terminal ILIM of the charging chip UP1. The charging chip UP1 controls the charging current of the charging capacitor 14 according to the resistance of the charging resistor RP8. . The resistance of the charging resistor RP8 can be set according to actual needs, so as to control the charging current of the charging capacitor 14 . In some embodiments, the charging chip UP1 may stop charging the charging capacitor 14 after the charging of the charging capacitor 14 is completed. In other embodiments that do not include the wide-voltage DC circuit 156 , the charging chip UP1 can be directly connected to the power conversion circuit 154 through the second diode D272 .

In some implementations, the charging circuit 153 includes a third capacitor C33 and a seventh resistor R35, and the third capacitor C33 and the seventh resistor R35 are connected in parallel to the charging chip UP1 (overvoltage protection control input pin OVP and start-up delay control terminal SS) between the land.

In some embodiments, the doorbell camera 100 includes at least two charging capacitors 14 , and the at least two charging capacitors 14 are connected to the charging circuit 153 in series. In this embodiment, the doorbell camera 100 includes two charging capacitors 14, and the two charging capacitors 14 are connected in series between the charging chip UP1 and the ground. In this way, when the voltage of a single charging capacitor 14 is insufficient to drive the camera circuit 13 , the at least two charging capacitors 14 connected in series can provide a larger power supply voltage to the outside.

In some embodiments, the control circuit 15 includes a boost circuit (not shown), such as a BOOST boost circuit. The boosting circuit is connected between the charging capacitor 14 and the camera system power supply 1312 for boosting the voltage of the charging capacitor 14 and outputting the boosted voltage to the camera system power supply 1312 . In this way, when the capacity of the charging capacitor 14 cannot meet the requirements, the capacity utilization rate of the charging capacitor 14 can be improved through the booster circuit. For example, when the booster circuit is not provided, if the capacity of the charging capacitor 14 is insufficient, the voltage of the charging capacitor 14 may drop from 5V to 4V, that is, the camera system power supply 1312 can no longer be powered. However, if a booster circuit is provided, the voltage of the charging capacitor 14 is reduced from 5 volts to 2.5 volts, and the camera system power supply 1312 can still be powered normally, thus improving the capacity utilization of the charging capacitor 14 . In some other embodiments, if the capacity of the charging capacitor 14 meets the requirements, a booster circuit is not provided to reduce the circuit cost.

In some embodiments, the control circuit 15 includes at least two voltage dividing resistors RP10 and RP11 , each charging capacitor 14 may correspond to different voltage dividing resistors RP10 and RP11 respectively, and each charging capacitor 14 is connected in parallel with the corresponding voltage dividing resistors RP10 and RP11 The resistance values of the voltage dividing resistors RP10 and RP11 connected in parallel with the respective charging capacitors 14 are equal. In this way, the voltage distribution on each charging capacitor 14 is relatively uniform, avoiding a situation where some charging capacitors 14 have been charged or discharged, and other charging capacitors 14 have not been charged or discharged.

In some embodiments, the control circuit 15 includes a voltage detection circuit 157, the voltage detection circuit 157 is connected between the controller 152 and the charging capacitor 14, and the controller 152 is used for detecting the voltage of the charging capacitor 14 through the voltage detection circuit 157, and when charging When the voltage of the capacitor 14 is lower than the threshold value, the linkage switch 151 is controlled to be turned off. In this way, the charging capacitor 14 can be charged in time, and the camera circuit 13 can be powered through the power supply 19 in time, so as to ensure the normal operation of the camera circuit 13.

In some embodiments, the voltage detection circuit 157 may include a first voltage dividing resistor R161 and a second voltage dividing resistor R162, the first voltage dividing resistor R161 and the second voltage dividing resistor R162 are connected in series between the charging capacitor 14 and the ground, The voltage of the charging capacitor 14 is divided. The voltage detection circuit 157 is connected to the controller 152 through the voltage amplitude detection terminal V_CAP_DETECT. The controller 152 is connected between the first voltage dividing resistor R161 and the second voltage dividing resistor R162, and determines the voltage of the charging capacitor 14 by detecting the divided voltage. The circuit is relatively simple.

Referring to FIG. 1 and FIG. 2 , the present application provides a doorbell camera 100 . The doorbell camera 100 includes a power supply terminal 11, a switch circuit 17, a mechanical doorbell 12, a camera circuit 13 and a charging capacitor 14. The power supply terminal 11 is used to connect with the power supply 19; the switch circuit 17 includes a doorbell switch 16; the control circuit 15 includes a linkage switch 151, The power conversion circuit 154, the charging circuit 153 and the controller 152, the mechanical doorbell 12 is connected to the power supply terminal 11 in series with the linkage switch 151 and the power conversion circuit 154 respectively, and the linkage switch 151 is connected in parallel with the power conversion circuit 154; the power conversion circuit 154 includes a conversion The output terminal DC_WIDE, the charging capacitor 14 is connected to the conversion output terminal DC_WIDE through the charging circuit 153, the camera circuit 13 is connected to the conversion output terminal DC_WIDE, and the controller 152 is respectively connected to the doorbell switch 16 and the linkage switch 151. The controller 152 is configured as:

When the first electrical signal (eg, low level) indicating that the doorbell switch 16 is closed is detected, the first control signal is output to control the linkage switch 151 to be connected, so that the power supply terminal 11 supplies power to the mechanical doorbell 12, so that the mechanical doorbell 12 makes a sound , the charging capacitor 14 is used to supply power to the camera circuit 13;

When the second electrical signal (eg, high level) indicating that the doorbell switch 16 is disconnected is detected, the second control signal is output to control the linkage switch 151 to be disconnected, so that the power supply terminal 11 supplies power to the power conversion circuit 154 through the mechanical doorbell 12 , after the power conversion circuit 154 converts the voltage output by the power supply 19 , and outputs it through the conversion output terminal DC_WIDE to supply power to the camera circuit 13 and charge the charging capacitor 14 through the charging circuit 153 .

In some embodiments, the switch circuit 17 includes a first resistor RT1, a second resistor RT2 and a switch detection power supply 171, the controller 152 includes a detection terminal BELL_BUTTON, the first resistor RT1 and the doorbell switch 16 are connected in series to the switch detection power supply 171 and the ground In between, the switch detection power supply 171 is connected to the doorbell switch 16 through the first resistor RT1, the detection terminal BELL_BUTTON is connected between the first resistor RT1 and the doorbell switch 16 through the second resistor RT2, and the switch circuit 17 is set as:

When the doorbell switch 16 is closed, a first electrical signal is generated to the controller 152;

When the doorbell switch 16 is turned off, a second electrical signal is generated to the controller 152 .

In some embodiments, the control circuit 15 includes an isolation circuit 155. The isolation circuit 155 is connected between the controller 152 and the linkage switch 151. The controller 152 is used to control the on-off of the linkage switch 151 by controlling the isolation circuit 155. The controller 152 is set to:

When detecting the first electrical signal indicating that the doorbell switch 16 is closed, the first control signal is output to control the isolation circuit 155 to be energized to control the linkage switch 151 to be connected;

When a second electrical signal indicating that the doorbell switch 16 is turned off is detected, a second control signal is output to control the isolation circuit 155 to turn off, and to control the linkage switch 151 to turn off.

In some embodiments, the linkage switch 151 includes a thyristor Q1, the controller 152 includes a control terminal BELL_CTL, the isolation circuit 155 includes an optocoupler OP1 and an isolation power supply 1551, the control circuit 15 includes a transistor Q2, and the base of the transistor Q2 and the control The control terminal BELL_CTL of the transistor 152 is connected, one of the collector and the emitter of the transistor Q2 is connected to the optocoupler OP1, and is connected to the isolated power supply 1551 through the optocoupler OP1, and the other one of the collector and the emitter of the transistor Q2 One ground, thyristor Q1 is connected to optocoupler OP1, and controller 152 is set to:

When detecting the first electrical signal indicating that the doorbell switch 16 is closed, the first control signal is output to control the conduction of the transistor Q2, so as to control the optocoupler OP1 to be energized, and then control the thyristor Q1 to be connected;

When the second electrical signal indicating that the doorbell switch 16 is turned off is detected, a second control signal is output to control the transistor Q2 to be turned off, so as to control the optocoupler OP1 to be turned off, and then the thyristor Q1 to be turned off.

In some embodiments, the power conversion circuit 154 includes an overcurrent protection device F1, a rectifier DB2, a step-down capacitor CP1, filter capacitors C220, C3, and a surge protector U19. The rectifier DB2 is connected to the power supply terminal 11 through the mechanical doorbell 12, using In order to convert the alternating current output by the power supply 19 into direct current, the filter capacitors C220, C3, the surge protector U19 and the step-down capacitor CP1 are connected in parallel between the rectifier DB2 and the conversion output terminal DC_WIDE, and the overcurrent protection device F1 is connected in series with the mechanical doorbell 12 and the rectifier DB2.

In some embodiments, the camera circuit 13 includes a camera function circuit 1311 and a camera system power supply 1312. The camera system power supply 1312 includes a power supply input terminal IN1 and a power supply output terminal OUT1. The power supply input terminal IN1 is connected to the conversion output terminal DC_WIDE and the charging capacitor 14. The output terminal OUT1 is connected to the camera function circuit 1311. When the linkage switch 151 is connected, the charging capacitor 14 supplies power to the camera circuit 13 through the power supply input terminal IN1. When the linkage switch 151 is off, the power conversion circuit 154 converts the output voltage of the power source 19, The camera system power supply 1312 is used to convert the voltage input through the power supply input terminal IN1 into the working voltage of the camera function circuit 1311 by converting the output terminal DC_WIDE output to supply power to the camera circuit 13 and charging the charging capacitor 14 through the charging circuit 153 . Powers the camera function circuit 1311.

In some embodiments, the camera system power supply 1312 includes a charging control terminal CAP_EN, and the charging circuit 153 includes a charging chip UP1. The charging capacitor 14 is connected to the conversion output terminal DC_WIDE through the charging chip UP1, and the charging control terminal CAP_EN is connected to the charging chip UP1. The charging chip UP1 is set as:

If it receives the control signal output by the charging control terminal CAP_EN indicating that charging is started, start charging the charging chip UP1;

If receiving a control signal output from the charging control terminal CAP_EN indicating not to start charging, the charging chip UP1 is not started to be charged.

In some embodiments, the control circuit 15 includes a wide voltage DC circuit 156 , the wide voltage DC circuit 156 is connected between the conversion output terminal DC_WIDE and the charging chip UP1 , and is connected between the conversion output terminal DC_WIDE and the power supply input terminal of the camera system power supply 1312 Between IN1, according to the input voltage required by the power supply input terminal IN1 of the camera system power supply 1312 and the charging voltage required by the charging capacitor 14, the voltage output by the conversion output terminal DC_WIDE is converted and output to the camera system power supply 1312 and charging. Capacitor 14.

In some embodiments, the control circuit 15 includes a first diode D262, the anode of the first diode D262 is connected to the conversion output terminal DC_WIDE, and the cathode of the first diode D262 is connected to the power supply input terminal IN1 of the camera system power supply 1312; and / or

The control circuit 15 includes a second diode D272, the anode of the second diode D272 is connected to the conversion output terminal DC_WIDE, and the cathode of the second diode D272 is connected to the charging chip UP1; and/or

The control circuit 15 includes a third diode D282 , the anode of the third diode D282 is connected to the charging capacitor 14 , and the cathode of the third diode D282 is connected to the power supply input terminal IN1 of the camera system power supply 1312 .

In some embodiments, the control circuit 15 includes a voltage detection circuit 157, the voltage detection circuit 157 is connected between the controller 152 and the charging capacitor 14, and the controller 152 is used for detecting the voltage of the charging capacitor 14 through the voltage detection circuit 157, and when charging When the voltage of the capacitor 14 is lower than the threshold value, the linkage switch 151 is controlled to be turned off.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims

A doorbell camera comprising:

The power supply terminal is used to connect with the power supply;

mechanical doorbell;

camera circuit;

a charging capacitor, electrically connected to the power supply terminal and the camera circuit;

A control circuit includes a linkage switch and a controller, the camera circuit, the charging capacitor and the linkage switch are connected in parallel to the power supply terminal, the mechanical doorbell and the linkage switch are connected in series to the power supply terminal, so The controller is connected with the linkage switch, and is used to control the on-off of the linkage switch; when the linkage switch is connected, the power supply terminal is used to supply power to the mechanical doorbell, so that the mechanical doorbell emits a sound, so the The charging capacitor is used to supply power to the camera circuit; when the linkage switch is turned off, the power supply terminal is used to charge the charging capacitor and supply power to the camera circuit through the mechanical doorbell, and the mechanical doorbell does not work. Make noise.
The doorbell camera of claim 1, wherein the doorbell camera comprises a doorbell switch, the controller is connected to the doorbell switch, and the controller is used to detect the on-off of the doorbell switch, according to the doorbell switch The on-off of the doorbell controls the on-off of the linkage switch, wherein when the controller detects that the doorbell switch is turned on, the controller controls the linkage switch to be turned on, so as to control the sound effect duration of the mechanical doorbell, the mechanical doorbell The sound effect duration of the doorbell is consistent with the conduction duration of the doorbell switch.
The doorbell camera of claim 2, wherein when the controller detects a low level indicating that the doorbell switch is connected, the controller controls the linkage switch to be connected; the controller detects that the doorbell switch is disconnected When the high level is on, the linkage switch is controlled to be disconnected.
The doorbell camera of claim 2, wherein when the linkage switch is turned off, the mechanical doorbell and the camera circuit form a current path, so that the voltage across the mechanical doorbell is insufficient to drive the mechanical doorbell to work , so that the mechanical doorbell does not make a sound.
The doorbell camera of claim 4, wherein,

When the linkage switch is turned off, the electric energy of the power supply received by the power supply terminal charges the charging capacitor and supplies power to the camera circuit;

When the linkage switch is connected and the camera circuit is short-circuited, the electrical energy stored in the charging capacitor supplies power to the camera circuit.
The doorbell camera of claim 5, wherein when the interlocking switch is turned on, the voltage of the charging capacitor is detected to be lower than a threshold, and the controller controls the interlocking switch to be turned off.
The doorbell camera according to any one of claims 1 to 6, wherein the control circuit comprises a voltage detection circuit, the voltage detection circuit is connected between the controller and the charging capacitor, and the controller is used for The voltage of the charging capacitor is detected by the voltage detection circuit; the charging capacitor includes a super capacitor; the linkage switch includes a thyristor.
The doorbell camera of claim 7, wherein the control circuit comprises an isolation circuit, the isolation circuit is connected between the controller and the linkage switch, and the controller is configured to control the isolation circuit to Control the on-off of the linkage switch.
The doorbell camera of claim 8, wherein the isolation circuit comprises a photocoupler and an isolated power supply, the linkage switch comprises a thyristor, and the photocoupler is connected to the control terminal of the controller and the between the control electrodes of the thyristor and connected with the isolated power supply; the controller controls the on or off of the thyristor by controlling the on-off of the photocoupler.
The doorbell camera of claim 9, wherein the control circuit comprises a triode, the base of the triode is connected to the control terminal of the controller, and one of the collector and the emitter of the triode is connected to the is connected to the photoelectric coupler, and is connected to the isolated power supply through the photoelectric coupler, and the other one of the collector and the emitter of the triode is grounded; the controller controls the on-off of the triode to control the The optocoupler is switched on and off.
The doorbell camera of claim 10, wherein the control circuit comprises a charging circuit, the charging circuit is connected between the power supply terminal and the charging capacitor, and is used for charging the charging capacitor and/or The charging control is performed on the charging capacitor; the camera circuit includes a camera system power supply, and the camera system power supply is connected to the charging circuit for controlling whether the charging circuit starts to work.
The doorbell camera of claim 11, wherein the control circuit comprises a booster circuit, the booster circuit is connected between the charging capacitor and the camera system power supply, and is used to convert the voltage of the charging capacitor Boosting is performed, and the boosted voltage is output to the camera system power supply.
A doorbell camera comprising:

The power supply terminal is used to connect with the power supply;

switch circuits, including doorbell switches;

mechanical doorbell;

camera circuit;

charging capacitor;

A control circuit, including a linkage switch, a power conversion circuit, a charging circuit and a controller, the mechanical doorbell is respectively connected in series with the linkage switch and the power conversion circuit to the power supply terminal, and the linkage switch and the power conversion The circuits are connected in parallel; the power conversion circuit includes a conversion output terminal, the charging capacitor is connected to the conversion output terminal through the charging circuit, the camera circuit is connected to the conversion output terminal, and the controller is respectively connected to the conversion output terminal. The doorbell switch and the linkage switch, the controller is configured to:

When a first electrical signal indicating that the doorbell switch is closed is detected, a first control signal is output to control the linkage switch to be connected, so that the power supply terminal supplies power to the mechanical doorbell, so that the mechanical doorbell emits a sound, so the charging capacitor supplies power to the camera circuit;

When a second electrical signal indicating that the doorbell switch is disconnected is detected, a second control signal is output to control the linkage switch to be disconnected, so that the power supply terminal supplies power to the power conversion circuit through the mechanical doorbell, so that After the power conversion circuit converts the voltage output by the power supply, it is output through the conversion output terminal to supply power to the camera circuit, and the charging capacitor is charged through the charging circuit.
The doorbell camera of claim 13, wherein the first electrical signal is a low level and the second electrical signal is a high level.
The doorbell camera of claim 14, wherein the controller is connected to the doorbell switch, and the controller is configured to control the on-off of the linkage switch according to the on-off of the doorbell switch; wherein the control When the doorbell switch is turned on, the device controls the linkage switch to be turned on to control the sound effect duration of the mechanical doorbell, so that the sound effect duration of the mechanical doorbell is consistent with the conduction duration of the doorbell switch.
The doorbell camera of claim 15, wherein when the linkage switch is turned off, the mechanical doorbell and the camera circuit form a current path, so that the voltage across the mechanical doorbell is insufficient to drive the mechanical doorbell to work , so that the mechanical doorbell does not make a sound.
The doorbell camera of claim 16, wherein,

When the linkage switch is turned off, the electric energy of the power supply received by the power supply terminal charges the charging capacitor and supplies power to the camera circuit;

When the linkage switch is connected and the camera circuit is short-circuited, the electrical energy stored in the charging capacitor supplies power to the camera circuit.
The doorbell camera of claim 17, wherein when the linkage switch is turned on, the voltage of the charging capacitor is detected to be lower than a threshold, and the controller controls the linkage switch to be turned off.
The doorbell camera according to any one of claims 13 to 18, wherein the control circuit includes a voltage detection circuit, the voltage detection circuit is connected between the controller and the charging capacitor, and the controller is used for The voltage of the charging capacitor is detected by the voltage detection circuit; the charging capacitor includes a super capacitor; the linkage switch includes a thyristor.
The doorbell camera of claim 19, wherein the control circuit comprises an isolation circuit, the isolation circuit is connected between the controller and the linkage switch, and the controller is configured to control the isolation circuit to Control the on-off of the linkage switch.
The doorbell camera of claim 20, wherein the isolation circuit comprises a photocoupler and an isolated power supply, the linkage switch comprises a thyristor, and the photocoupler is connected to the control terminal of the controller and the between the control electrodes of the thyristor, and is connected with the isolated power supply; the controller controls the on or off of the thyristor by controlling the on-off of the optocoupler.
The doorbell camera of claim 21, wherein the control circuit comprises a triode, the base of the triode is connected to the control terminal of the controller, and one of the collector and the emitter of the triode is connected to the is connected to the photoelectric coupler, and is connected to the isolated power supply through the photoelectric coupler, and the other one of the collector and the emitter of the triode is grounded; the controller controls the on-off of the triode to control the The optocoupler is switched on and off.
The doorbell camera of claim 13, wherein the switch circuit comprises a first resistor, a second resistor and a switch detection power supply, the controller comprises a detection terminal, the first resistor and the doorbell switch are connected in series to Between the switch detection power supply and the ground, the switch detection power supply is connected to the doorbell switch through the first resistor, and the detection terminal is connected to the first resistor and the doorbell switch through the second resistor between, the switch circuit is set to:

When the doorbell switch is closed, the first electrical signal is generated to the controller;

When the doorbell switch is turned off, the second electrical signal is generated to the controller.
The doorbell camera of claim 13, wherein the control circuit comprises an isolation circuit, the isolation circuit is connected between the controller and the linkage switch, and the controller is configured to control the isolation circuit to To control the on-off of the linkage switch, the controller is set to:

When detecting the first electrical signal indicating that the doorbell switch is closed, output the first control signal to control the isolation circuit to be energized to control the linkage switch to be connected;

When the second electrical signal indicating that the doorbell switch is disconnected is detected, the second control signal is output to control the isolation circuit to be powered off, so as to control the linkage switch to be disconnected.
The doorbell camera of claim 13, wherein the power conversion circuit comprises an overcurrent protection device, a rectifier, a step-down capacitor, a filter capacitor and a surge protector, and the rectifier communicates with the power supply terminal through the mechanical doorbell connected to convert the alternating current output by the power supply into direct current, the filter capacitor, the surge protector and the step-down capacitor are connected in parallel between the rectifier and the conversion output terminal, the A flow protection device is connected in series between the mechanical doorbell and the rectifier.