KR20180044690A - Doorbell apparatus - Google Patents

Abstract

The door bell apparatus according to an embodiment of the present invention comprises a power input unit; a rectifying unit for rectifying an AC voltage inputted from the power input unit to a DC voltage, a bypass unit for controlling the path of current inputted from the power input unit based on the output value of the rectifying unit that varies depending upon on/off of a door bell switch; and an interface unit, wherein the bypass unit includes a bypass IC for comparing the output value of the rectifying unit with a reference value and a bypass switch whose on/off is controlled according to the result of comparison by the bypass IC, and the current inputted from the power input unit flows toward the door bell or toward the interface depending upon on/off of the bypass switch. According to an embodiment of the present invention, the current to the door bell is blocked at the moment when power is supplied to the interface device and thus it is possible to prevent a problem of malfunctioning or noise in the door bell.

Description

Door Bell Apparatus {DOORBELL APPARATUS}

The present invention relates to a door bell device.

Conventional door bell systems applied at the premises include transformers, doorbells, and doorbell switches.

1 to 2 show an example of a door bell system.

Referring to Figures 1-2, the transformer 10 may include a primary coil and a secondary coil. The primary coil may be connected to the home AC power source (not shown), and the secondary coil may be connected in series to the door bell 12 and the door bell switches 14, 16. The transformer 10 converts the AC voltage to a level suitable for driving the door bell. The door bell 12 is a device for outputting sound by using electromagnetic or electricity, and may be used in combination with a bell, a buzzer, a chime, and the like. The door bell switches 14 and 16 are normally open switches. When the door bell switch is closed, the door bell system is activated. The door bell switches 14 and 16 may be used in combination with a button. For example, when a person presses the door bell switches 14 and 16, the door bell switches 14 and 16 are closed, and a closed circuit for the door bell 12 is formed. As a result, a large current flows through the electric wire coil in the door bell 12 to become an electromagnet. There is a ball inside the wire coil, and the wire coil with the electromagnet pulls the ball and can output the sound.

As shown in Figure 1, in a single door system, the door bell system 10 may include a single button 14, but in a two door system, the door bell system 10 May include two buttons 14,

On the other hand, as the need for user convenience increases, a technique for connecting various interface devices to the door bell switch has been developed. For this, there is an attempt to supply power to the interface device by diverting power from the conventional door bell system. At this time, the current flowing through the interface device affects the door bell, which may cause malfunction of the door bell or noise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a door bell system including an interface device.

The door bell apparatus according to an embodiment of the present invention includes a power input unit, a rectifying unit for rectifying the AC voltage input from the power input unit to a DC voltage, and a control unit for controlling the power input unit, And a bypass unit for comparing the output value of the rectifying unit and a reference value, and a bypass IC for comparing the output value of the rectifying unit with a reference value, The current flowing from the power input section flows toward the door bell or flows toward the interface according to the on / off state of the bypass switch, .

When the door bell switch is turned on, the output value of the rectifying unit is lower than the reference value. When the door bell switch is turned off, the output value of the rectifying unit may be higher than the reference value.

When the door bell switch is turned on, the first bypass switch is turned off, and a current input from the power input unit is transmitted to the door bell through the door bell, And when the door bell switch is turned off, the first bypass switch is turned on so that a current input from the power input unit can flow toward the interface unit.

The bypass switch may further include a second bypass switch connected in series to the door bell. When the door bell switch is turned on, the second bypass switch is turned on, and a path through which current flows toward the interface is interrupted When the door bell switch is turned off, the second bypass switch is turned off, and a path through which current flows toward the door bell may be cut off.

The bypass switch may include a solid state relay (SSR).

The SSR may include an optocoupler.

And a voltage distribution unit disposed between the power input unit and the rectification unit and distributing a voltage output from the power input unit.

Wherein the bypass switch includes a first bypass switch connected in parallel to the door bell, and a second bypass switch connected in series to the door bell, wherein the first bypass switch and the second bypass switch are turned on Off can be alternately controlled.

The bypass IC may output a first PWM signal for controlling on / off of the first bypass switch and a second PWM signal for controlling on / off of the second bypass switch.

The door bell system according to an embodiment of the present invention includes a door bell, a door bell switch connected to the door bell, and a door bell connected to the door bell switch. A bypass unit for controlling a path of a current input from the power input unit based on an output value of the rectifying unit that varies depending on the on / off state of the door bell switch, The bypass unit includes a bypass IC for comparing the output value of the rectifying unit with a reference value, and a bypass circuit for controlling the on / off state of the bypass IC, Wherein a current input from the power input unit is directed toward the door bell according to ON / OFF of the bypass switch Or, it flows toward the interface.

The door bell system according to the embodiment of the present invention can stably supply power to the interface device. Particularly, according to the embodiment of the present invention, since the current flowing to the door bell is blocked at the moment when power is supplied to the interface device, it is possible to prevent the door bell from malfunctioning or noise from occurring in the door bell. Also, according to the embodiment of the present invention, it is possible to supply power to the interface device without a battery.

1 to 2 show an example of a door bell system.
3 is an example of a circuit diagram included in the door bell device.
4 is a schematic diagram illustrating a door bell system in accordance with an embodiment of the present invention.
5 is a block diagram of an interface unit included in a door bell system according to an embodiment of the present invention.
Fig. 6 shows an example in which the door bell system of Fig. 4 is applied to a two door system.
7 is a schematic circuit diagram showing the door bell system of Fig.
8 is a schematic diagram illustrating a door bell system according to another embodiment of the present invention.
Fig. 9 shows an example in which the door bell system of Fig. 8 is applied to a two door system.
10 is a circuit diagram illustrating alternate control of a bypass switch according to an embodiment of the present invention.
11 is a circuit diagram of a door bell apparatus according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant description thereof will be omitted.

3 is an example of a circuit diagram included in the door bell device.

Referring to FIG. 3, AC power is supplied to the door bell unit 400 through the power input unit 410.

The switching circuit 440 is coupled to the door bell switch 300 and may include a triac element 442. The triac element 442 is a semiconductor control component to which bidirectional current control is performed, and has two main electrodes E1 and E2 and one gate electrode G. When there is no gate signal applied to the gate electrode G, the triac element 442 is turned off. When there is a gate signal applied to the gate electrode G, the triac element 442 is turned on by the main electrode E1 , E2), regardless of the polarity of the first, second,

When the door bell switch 300 is pressed, that is, when the door bell switch 300 is turned on, a gate signal is applied to the gate electrode G of the triac element 442, and a closed circuit is formed in the A path. That is, the current path is directed to the door bell 200 and the door bell switch 300, and the current can not be blocked by the B path toward the controller 450. Since no current flows to the control unit 450, the power required by the interface unit 420 can be supplied from the battery unit 430.

On the other hand, when the pressed state of the door bell switch 300 is released, that is, when the door bell switch 300 is in the off state, the current path is directed to the control unit 450. To this end, the switch circuit 440 may further include a rectifier 446. The rectifier 446 is connected to the controller 450 and rectifies the AC current supplied from the power input unit 410 to a DC current and supplies the rectified DC current to the controller 450. At this time, the rectifier 446 may include, for example, a bridge diode. A bridge diode is a bridge circuit that connects four diodes. The bridge diode rectifies AC current to DC current and outputs it.

The control unit 450 receives the DC current rectified by the rectifier 446. The controller 450 may include a converter 452 and a battery charging chip 454. The converter 452 may lower the DC current output through the rectifier 446 to the voltage for the battery charging chip 454. [ Here, the converter 452 may be a DC-DC converter. For example, converter 452 may convert a voltage of 8 to 24V to a voltage of 5V.

The battery charging chip 454 is connected to the converter 452 and receives a predetermined voltage from the converter 452. The battery charging chip 454 may control the power supply to the interface unit 420 or may control the battery unit 430 to charge the power. The battery charging chip 454 may control the battery unit 430 to supply the power charged in the battery unit 430 to the interface unit 420. The battery charging chip 454 may be mixed with a BMIC (Battery Management IC).

At this time, when the overcurrent flows in the process of charging the battery unit 430, there is a problem that noise occurs in the door bell 200.

According to the embodiment of the present invention, a bypass unit is added so that current does not flow to the door bell when the door bell switch is off.

FIG. 4 is a schematic diagram showing a door bell system according to an embodiment of the present invention, FIG. 5 is a block diagram of an interface part included in a door bell system according to an embodiment of the present invention, Fig. 7 is a schematic circuit diagram showing the door bell system of Fig. 4. Fig. 7 is a schematic circuit diagram of the door bell system of Fig.

4, the door bell system 1000 includes a power input unit 1100, a door bell switch 1200, a bypass unit 1300, an interface unit 1400, a door bell 1500, a rectifying unit 1600, And a voltage distribution section 1700. [ Although not shown, the door bell system 1000 may further include a control unit and a battery unit shown in Fig.

The power input unit 1100 supplies power to the interface unit 1400 and the door bell 1500. At this time, the power supplied from the power input unit 1100 may be an AC voltage input from the home AC power source.

The rectifying unit 1600 rectifies the AC voltage input from the power input unit 1100 to a DC voltage.

The bypass unit 1300 controls the path of the current input from the power supply input unit 1100 based on the output value of the rectification unit 1600. The output value of the rectifying unit 1600 may vary depending on the on / off state of the door bell switch 1200. That is, when the door bell switch 1200 is off, the bypass unit 1300 can control the current path to be directed to the interface unit 1400. On the contrary, when the door bell switch 1200 is in an On state, the bypass unit 1300 can control the current path to be directed to the door bell 1500.

5, the interface unit 1400 includes a system on chip (SoC) 1410, an image module 1420, a sensor module 1430, an audio module 1440, a communication module 1450, and an LED module 1460 ). However, this is merely an example, and the interface unit 1400 according to an embodiment of the present invention may include more or fewer configurations than these configurations.

The SoC 1410 is connected to the image module 1420, the sensor module 1430, the audio module 1440, the communication module 1450 and the LED module 1460 and can control the interface 1400 in general have. For example, the SoC 1410 can control the enabling or disabling of modules included in the interface unit 1400. [

The image module 1420 may include a camera unit. The camera unit may include a lens and an image sensor. The lens includes at least one of a convex lens, a concave lens, a cylinder lens, a Fresnel lens, and a wide-angle lens, and photographs a range of objects from the installed position. The image sensor converts an optical signal incident through the lens module into an image signal. The image sensor corresponds to a configuration generally used in a digital camera or the like, and serves to convert light received through a camera lens, that is, captured image information, into electrical information, digital information.

The sensor module 1430 senses the surrounding objects. The sensor module 1430 may include at least one of a geomagnetic sensor, an acceleration sensor, an altimeter, a gyro sensor, an infrared sensor, and a proximity sensor, for example. Here, the infrared sensor may be a passive infrared ray (PIR) sensor. The PIR sensor can sense the temperature change of the object. Accordingly, when the person is moving, the sensor module 1430 can detect the presence of a person using the temperature change. The sensor module 1430 is installed around the image module 1420, and a plurality of the sensor modules 1430 can be installed.

The SoC 1410 receives the image signal through the image module 1420, receives the sensing signal of the object through the sensor module 1430, and processes it. For example, the SoC 1410 can correct the image signal received through the image module 1420 using the sensing signal of the object received through the sensor module 1430. [

Audio module 1440 may include a microphone and a speaker. The microphone can receive an audio signal, and the speaker can output an audio signal. The SoC 1410 can process an audio signal input through a microphone.

The communication module 1450 includes a wired or wireless communication module and transmits an image signal processed through the SoC 1410 to a display device (not shown) or an audio signal processed through the SoC 1410 to a speaker .

The LED module 1460 is a light emitting module and can be mixed with a flash LED.

The interface unit 1400 may be mixed with a network camera or a camera device.

4 and 6, the bypass unit 1300 includes a bypass IC (integrated chip) 1310 for comparing the output value of the rectifying unit 1600 with a reference value, and a comparison result of the bypass IC 1310 And a bypass switch 1320 that is turned on or off according to the control signal. At this time, the bypass switch 1320 may be connected to the door bell 1500 in parallel.

When the door bell switch 1200 is turned on, the output value of the rectifying unit 1600 becomes lower than the reference value. Thus, the bypass IC 1310 controls the bypass switch 1320 to be turned off. When the bypass switch 1320 is turned off, the current input from the power input unit 1100 flows toward the door bell 1500, and the path through which the current flows toward the interface unit 1400 can be cut off.

On the other hand, when the door bell switch 1200 is turned off, the output value of the rectifying unit 1600 becomes higher than the reference value. Thus, the bypass IC 1310 controls the bypass switch 1320 to be turned on. When the bypass switch 1320 is turned on, the current input from the power input unit 1100 can flow toward the interface unit 1400.

Referring to FIG. 7, since the power supplied from the power input unit 1100 is mainly an AC power of 8Vac, 16Vac, and 24Vac, the power is rectified to the DC power through the rectifying unit 1600 and then supplied to the bypass IC 1310 have. Here, the rectification section 1600 may include a bridge diode. At this time, since 16Vac and 24Vac become about 23Vdc and 34Vdc after rectification, there is a problem that a high-cost bypass IC 1310 is required. To this end, a voltage distribution unit 1700 may be further disposed at the front end of the bridge diode. The voltage distribution unit 1700 may be, for example, a capacitor of rated 50V connected in series. Accordingly, the voltage supplied to the bypass IC 1310 can be lowered so as to accommodate a bypass IC of a lower level.

According to the embodiment of the present invention, when the door bell switch 1200 is turned on, a circuit connected to the power input unit 110, the door bell switch 1200, and the door bell 1500 is shorted, A voltage lower than the reference voltage is input. When a voltage lower than the reference voltage is input to the bypass IC 1310, the bypass IC 1310 can output a signal to turn off the bypass switch 1320. [ On the other hand, when a voltage higher than the reference voltage is input to the bypass IC 1310, the bypass IC 1310 can output a signal for turning on the bypass switch 1320. [

FIG. 8 is a schematic view showing a door bell system according to another embodiment of the present invention, and FIG. 9 shows an example in which the door bell system of FIG. 8 is applied to a two door system.

8 to 9, the door bell system 1000 includes a power input unit 1100, a door bell switch 1200, a bypass unit 1300, an interface unit 1400, a door bell 1500, a rectifying unit 1600 And a voltage distribution section 1700. [ Although not shown, the door bell system 1000 may further include a control unit and a battery unit shown in Fig. 4 to 7 will not be described.

The bypass unit 1300 is turned on or off according to the comparison result of the bypass IC 1310 and the bypass IC 1310 that compare the output value of the rectifying unit 1600 with the reference value, The first bypass switch 1320 connected in parallel to the door bell 1500 and the bypass IC 1310 are controlled to be turned on or off according to a comparison result of the bypass IC 1310, And a second bypass switch 1330 connected in series with the first switch 1500.

When the door bell switch 1200 is turned on, the output value of the rectifying unit 1600 becomes lower than the reference value. Thus, the bypass IC 1310 controls the first bypass switch 1320 to be turned off and the second bypass switch 1330 to be turned on. When the first bypass switch 1320 is turned off and the second bypass switch 1330 is turned on, a closed circuit connecting the power input unit 1100, the door bell switch 1200, and the door bell 1500 is formed, The current input from the power input unit 1100 flows toward the door bell 1500 and the path through which the current flows toward the interface unit 1400 can be cut off.

On the other hand, when the door bell switch 1200 is turned off, the output value of the rectifying unit 1600 becomes higher than the reference value. Thus, the bypass IC 1310 controls the first bypass switch 1320 to be turned on and the second bypass switch 1330 to be turned off. When the first bypass switch 1320 is turned off and the second bypass switch 1330 is turned on, a closed circuit for connecting the power input unit 1100 and the interface unit 1400 is formed, and the input from the power input unit 1100 The current flows toward the interface part 1400 and the path through which the current flows toward the door bell 1500 can be cut off.

On the other hand, immediately after the door bell switch 1200 is changed from the on state to the off state, the door bell 1500 needs a predetermined time to output a sound. Accordingly, it is necessary to control the bypass switch so that power is supplied to the door bell 1500 and the interface device 1400 for a predetermined time immediately after the door bell switch 1200 is changed from the on state to the off state. Hereinafter, the predetermined time required for the door bell 1500 to output sounds is referred to as bypass time. For example, a bypass time of about 200 ms is required for a mechanical door bell, and a bypass time of about 1000 ms for an electronic door bell.

When the bypass switch includes the first bypass switch and the second bypass switch according to the embodiment of the present invention, the first bypass switch and the second bypass switch may be alternately controlled, (1400).

10 is a circuit diagram illustrating alternate control of a bypass switch according to an embodiment of the present invention. In FIG. 9, it is assumed that the door bell switch 1200 is changed from the on state to the off state, that is, the door bell switch 1200 is in the off state.

Referring to FIG. 10, the first bypass switch 1320 and the second bypass switch 1330 may be alternately controlled through PWM control. Accordingly, power can be continuously supplied to the interface unit 1400 even while the door bell 1500 outputs sound, thereby preventing a problem that the capacitor of the interface unit 1400 is discharged and rebooted .

At this time, the PWM timing can be set differently depending on whether it is a mechanical door bell or an electronic door bell.

When the door bell switch 1200 is turned on, the circuit connected to the power input unit 1100, the door bell switch 1200, and the door bell 1500 is shorted. The voltage input to the terminal falls from the High value to the Low value lower than the reference voltage. When a voltage lower than the reference voltage is input to the bypass IC 1310, the bypass IC 1310 can determine that the door bell switch 1200 is turned on. On the other hand, when the door bell switch 1200 is turned off, the Low Act of the bypass IC 1310 is activated. The voltage input to the terminal rises from a Low value to a High value higher than the reference voltage. When the value input to the bypass IC 1310 changes from the Low value to the High value, the bypass IC 1310 can determine that the door bell switch 1200 has been changed from the on state to the off state.

) 및 제2 바이패스 스위치(1330)를 제어하기 위한 신호(

)를 출력할 수 있다. For this purpose, the bypass IC 1310 outputs a signal (for controlling the first bypass switch 1320

And a signal for controlling the second bypass switch 1330

Can be output.

At this time, a signal for controlling the first bypass switch 1320 and a signal for controlling the second bypass switch 1330 may be output as a PWM waveform and alternately controlled. That is, the signal for controlling the first bypass switch 1320 and the signal for controlling the second bypass signal 1330 may all be PWM waveforms having the same amplitude and frequency. At this time, in a period in which a signal for controlling the first bypass switch 1320 is on, a switch for controlling the second bypass switch 1330 is off, and a signal for controlling the first bypass switch 1320 is The switch for controlling the second bypass switch 1330 in the off-period may be on. To this end, the bypass IC 1310 may further include an optional terminal 1332 and a PWM lamp 1334.

The user can control the PWM timing through the option terminal 1332 and the PWM lamp 1334. [

For example, a bypass time of about 200 ms is required for a mechanical door bell, and a bypass time of about 1000 ms for an electronic door bell. For a typical SSR, the minimum on-time is about 0.55 ms, the minimum off-time is about 18 μs, and the time required for one cycle is about 1.25 ms. Accordingly, the user can control the PWM timing between about 1.25 ms and about 200 ms or between about 1.25 ms and about 1000 ms.

When the first bypass switch 1320 and the second bypass switch 1330 are alternately controlled, even if the time required for the door bell 1500 to output sound is prolonged, And the interface unit 1400 are continuously supplied with power, the problem that the interface unit 1400 is rebooted can be prevented.

11 is a circuit diagram of a door bell apparatus according to an embodiment of the present invention.

Referring to FIG. 11, an AC power source is supplied from the power input unit 1100.

When the door bell switch 1200 is pressed, that is, when the door bell switch 1200 is turned on, a gate signal is applied to the gate electrode G of the triac element, It can be blocked so that current does not flow through the path toward the switch 1200 and toward the rectifying part 1600. [ The bypass IC 1310 turns off the first bypass switch 1320 and turns off the first bypass switch 1320. The bypass IC 1310 is turned off when the bypass IC 1310 is turned off, The switch 1330 can be controlled to be turned on. Accordingly, the power required by the interface unit 1400 can be supplied from the battery unit 1900.

On the other hand, when the door bell switch 1200 is in the OFF state, the current path is directed to the rectifying section 1600. The rectifying unit 1600 rectifies the AC current supplied from the power input unit 1100 to a DC current and supplies the rectified AC current to the control unit 1800. At this time, the rectifying unit 1600 may include, for example, a bridge diode. A bridge diode is a bridge circuit that connects four diodes. The bridge diode rectifies AC current to DC current and outputs it.

The bypass IC 1310 receives the DC current rectified by the rectification section 1600. When the voltage input to the bypass IC 1310 is higher than the reference voltage, the bypass IC 1310 turns on the first bypass switch 1320 and controls the second bypass switch 1330 to be turned off . Accordingly, a path through which the current flows to the door bell 1500 is blocked, thereby preventing a noise from occurring in the door bell 1500 or a malfunction of the door bell 1500.

In the present specification, the door bell and the door bell switch are installed in the premises as an example, but the present invention is not limited thereto. At least one of a door bell and a door bell switch may be included in the door bell apparatus according to an embodiment of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (10)

Power input unit,
A rectifying section for rectifying the AC voltage input from the power input section to a DC voltage,
A bypass section for controlling a path of a current input from the power input section based on an output value of the rectifying section that varies depending on the on / off state of the door bell switch, and
And an interface unit,
The bypass unit includes a bypass IC that compares the output value of the rectifying unit with a reference value, and a bypass switch that is turned on or off according to a comparison result of the bypass IC and,
Wherein the current input from the power input unit flows toward the door bell according to the on / off state of the bypass switch, or flows toward the interface. The method according to claim 1,
When the door bell switch is turned on, the output value of the rectifying unit is lower than the reference value,
And the output value of the rectifying part is higher than the reference value when the door bell switch is turned off. 3. The method of claim 2,
Wherein the bypass switch includes a first bypass switch connected in parallel to the door bell,
When the door bell switch is turned on, the first bypass switch is turned off, and a current input from the power input unit flows toward the door bell,
Wherein when the door bell switch is turned off, the first bypass switch is turned on so that a current input from the power input unit flows toward the interface unit. The method of claim 3,
Wherein the bypass switch further includes a second bypass switch connected in series to the door bell,
When the door bell switch is turned on, the second bypass switch is turned on and a path through which current flows toward the interface unit is cut off,
Wherein when the door bell switch is turned off, the second bypass switch is turned off and a path through which current flows toward the door bell is blocked. The method according to claim 1,
Wherein the bypass switch comprises a solid state relay (SSR). 6. The method of claim 5,
Wherein the SSR comprises an optocoupler. The method according to claim 1,
And a voltage distribution unit disposed between the power input unit and the rectification unit for distributing the voltage output from the power input unit. The method according to claim 1,
The bypass switch includes a first bypass switch connected in parallel to the door bell, and a second bypass switch connected in series to the door bell,
And the on / off states of the first bypass switch and the second bypass switch are alternately controlled. 9. The method of claim 8,
Wherein the bypass IC outputs a first PWM signal for controlling ON / OFF of the first bypass switch and a second PWM signal for controlling ON / OFF of the second bypass switch. Door bell,
A door bell switch connected to the door bell, and
And a door bell device connected to the door bell switch,
The door bell device
Power input unit,
A rectifying section for rectifying the AC voltage input from the power input section to a DC voltage,
A bypass section for controlling a path of a current input from the power input section based on an output value of the rectifying section that varies depending on the on / off state of the door bell switch, and
And an interface unit,
The bypass unit includes a bypass IC that compares the output value of the rectifying unit with a reference value, and a bypass switch that is turned on or off according to a comparison result of the bypass IC and,
Wherein the current input from the power input unit flows toward the door bell or flows toward the interface according to the on / off state of the bypass switch.

Images