CN217060784U

CN217060784U - Switching circuit and intelligent switch

Info

Publication number: CN217060784U
Application number: CN202221059698.0U
Authority: CN
Inventors: 贺龙胜; 覃振飞
Original assignee: Shenzhen Oribo Technology Co Ltd
Current assignee: Shenzhen Oribo Technology Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-07-26
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to a switch circuit and intelligent switch, switch circuit includes the relay, afterflow return circuit and drive circuit, the relay is monostable relay, the relay includes controlled coil and control end, the control end is used for controlling external circuit's break-make, the both ends of afterflow return circuit are connected respectively in the both ends of the controlled coil of relay, drive circuit connects in the controlled coil of relay, can reduce controlled coil and switch circuit's consumption demand by a wide margin, reach the application range who enlarges intelligent switch with this, and reduce intelligent switch's cost by a wide margin.

Description

Switching circuit and intelligent switch

Technical Field

The application relates to the technical field of intelligent household appliances, in particular to a switching circuit and an intelligent switch.

Background

With the continuous development of electronic technology, the intelligent switch integrates the daily life of common consumers by virtue of the wave of smart home and the large step, and becomes a common choice in home electrical equipment, so that the intelligent switch is widely applied to life.

The current single live wire intelligent switch gets the electric power ability relatively weak under the lamps and lanterns load of little wattage power, and the consumption that can provide for intelligent switch supports also very little, can't provide sufficient power supply for the intelligent switch that needs great consumption to this most of intelligent switches often can't normal use, causes intelligent switch's application range serious limitation.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a switching circuit and an intelligent switch.

According to a first aspect of the present application, an embodiment of the present application provides a switching circuit including a relay, a freewheel circuit, and a driving circuit. The relay is monostable relay, and the relay includes controlled coil and control end, and the control end is used for controlling external circuit's break-make, and the both ends of afterflow return circuit are connected respectively in the both ends of the controlled coil of relay, and drive circuit connects in the controlled coil of relay.

In some embodiments, the freewheel circuit includes a diode having a cathode connected to the first end of the controlled coil, an anode connected to the second end of the controlled coil, and a driving circuit connected to a connection node between the anode and the controlled coil.

In some embodiments, the driving circuit includes a transistor and a first resistor, wherein a collector of the transistor is connected to an anode of the diode, an emitter of the transistor is grounded, and a first end of the first resistor is connected to a base of the transistor and a second end of the first resistor is used for connecting with the control pin.

In some embodiments, the driving circuit further includes a second resistor, one end of the second resistor is connected to a connection node between the base of the transistor and the first resistor, and the other end of the second resistor is grounded.

In some embodiments, the switch circuit further includes a control chip, the control chip is connected to the driving circuit, and the control chip is configured to output a high-level signal to the driving circuit and adjust the high-level signal to a PWM signal after keeping the high-level signal for a predetermined time.

In some embodiments, the switching circuit further includes a power supply circuit, a first terminal of the power supply circuit is connected to a connection node between the controlled coil and the cathode of the diode, and a second terminal of the power supply circuit is connected to the control chip.

In some embodiments, the switching circuit further comprises an on-state power taking circuit connected between the control terminal of the relay and the power supply circuit.

In some embodiments, the switch circuit further includes an off-state power-taking circuit connected to the external circuit, the off-state power-taking circuit is electrically connected to the power supply circuit, a first end of the off-state power-taking circuit is connected to the control end of the relay, and a second end of the off-state power-taking circuit is connected to the power supply circuit.

In some embodiments, the switch circuit further comprises a wireless communication module, the wireless communication module is connected to the control chip, and the wireless communication module is suitable for establishing communication connection with external communication equipment; the wireless communication module includes at least one of the following elements: the device comprises a Bluetooth communication module, a Wi-Fi communication module and an infrared signal communication module.

According to the second aspect of this application, this application embodiment provides an intelligence switch, intelligence switch are single live wire intelligence switch, include above-mentioned switch circuit.

The switch circuit provided by the embodiment of the application, the follow current loop is connected to the controlled coil of the relay, and the energy stored in the controlled coil can be temporarily stored based on the follow current effect when the relay is disconnected, so that the switch circuit is protected, the driving circuit is connected to the controlled coil of the relay, and the on-off of the controlled coil can be controlled by controlling the on-off of the controlled coil, so that the state of the control end is controlled to control the on-off of the external circuit, the power consumption of the controlled coil and the power consumption of the switch circuit can be greatly reduced, the relay is a monostable relay, the cost of the switch circuit can be greatly reduced, the application range of the intelligent switch is expanded, and the cost of the intelligent switch is greatly reduced.

Drawings

In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a functional block diagram of a switching circuit provided in an embodiment of the present application.

Fig. 2 is a schematic circuit diagram of the switching circuit shown in fig. 1.

Fig. 3 is a schematic diagram of another circuit configuration of the switching circuit shown in fig. 1.

Fig. 4 is a waveform diagram of an output turn-on signal of a control chip of the switching circuit shown in fig. 1.

Fig. 5 is a waveform diagram of a control chip of the switching circuit shown in fig. 1 outputting a turn-off signal.

Fig. 6 is a schematic diagram of an intelligent switch provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of an intelligent home device according to an embodiment of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

As one skilled in the art will appreciate, manufacturers may refer to a component by different names, e.g., as used in the specification and the claims. The specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to,"; "substantially" means that a person skilled in the art is able to solve the technical problem within a certain error range and to achieve the technical result substantially.

Referring to fig. 1, fig. 1 schematically illustrates a structural schematic diagram of a switch circuit 100 according to an embodiment of the present disclosure. The switching circuit 100 includes a relay 10, a freewheel circuit 30, and a drive circuit 50. The relay 10 includes a controlled coil 12 and a control terminal 14, wherein the control terminal 14 is used for controlling the on/off of the external circuit 101. In the embodiment of the present application, the relay 10 may be a monostable relay, and the monostable relay is a relay having only one stable state, and when the monostable relay is excited by an input amount, the state of the monostable relay changes, and when the input amount is removed, the monostable relay returns to the original state. The freewheel circuit 30 has both ends connected to both ends of the controlled coil 12, respectively, and the freewheel circuit 30 is used to temporarily store energy stored in the controlled coil 12 based on a freewheel action when the relay 10 is turned off, thereby protecting the switching circuit 100. The driving circuit 50 is connected to the controlled coil 12, and the driving circuit 50 can control the on/off of the controlled coil 12, thereby controlling the state of the control terminal 14. In some embodiments, the driving circuit 50 transmits a turn-on control signal (e.g., an input voltage or current) to the controlled coil 12, so that the controlled coil 12 is powered on, and the controlled coil 12 generates an electromagnetic force to control the contact connection of the control end 14, so that the external circuit 101 is turned on; the driving circuit 50 transmits a turn-off control signal to the controlled coil 12, so that the controlled coil 12 is powered off, the electromagnetic force generated by the controlled coil 12 disappears, the contact of the control terminal 14 is disconnected, and the external circuit 101 is disconnected.

In the switching circuit 100 provided in the embodiment of the present application, the freewheeling circuit 30 is connected to the controlled coil 12 of the relay 10, and can temporarily store the energy stored in the controlled coil 12 based on the freewheeling action when the relay 10 is turned off, so as to protect the switching circuit 100, the driving circuit 30 is connected to the controlled coil 12 of the relay 10, and can control the state of the control terminal 14 by controlling the on/off of the controlled coil 12 to control the on/off of the external circuit 101, so as to reduce the power consumption of the controlled coil 12 and the switching circuit 100. Further, the relay 10 is a monostable relay, which can reduce the cost of the switch circuit 100.

Referring to fig. 2, in the embodiment of the present application, the controlled coil 12 has a first end 121 and a second end 123, and the first end 121 and the second end 123 are respectively connected to two ends of the freewheel circuit 30. When the controlled coil 12 is energized, the controlled coil 12 generates electromagnetic force to control the contact of the first end 141 to be connected with the contact of the second end 143, so that the first end 141 and the second end 143 of the control end 14 are conducted, that is, the relay 10 is conducted, and the external circuit 101 is conducted. When the controlled coil 12 is de-energized, the electromagnetic force generated by the controlled coil 12 disappears, which results in the disconnection between the contact of the first terminal 141 and the contact of the second terminal 143, and thus the first terminal 141 and the second terminal 143 of the control terminal 14 are disconnected, i.e., the relay 10 is opened, so that the external circuit 101 is opened.

In the present embodiment, the freewheel circuit 30 is connected between the relay 10 and the driving circuit 50, the freewheel circuit 30 includes the diode 32, the diode 32 includes the positive electrode 321 and the negative electrode 323, and the positive electrode 321 and the negative electrode 323 are connected to the controlled coil 12, so that a power consumption path can be provided for the reverse electromotive force when sudden changes of voltage and current occur in the switch circuit 100, thereby protecting the switch circuit 100 when the relay 10 is disconnected. Specifically, the cathode 323 of the diode 32 is connected to the first end 121 of the controlled coil 12, and the anode 321 of the diode 32 is connected to the second end 123 of the controlled coil 12, since a large amount of energy is stored when the controlled coil 12 is powered on, a back electromotive force is generated when the controlled coil 12 is powered off, and other components in the switching circuit 100 are easily broken down, at this time, since the diode 32 is connected in a direction exactly the same as the direction of the back electromotive force, the energy stored in the controlled coil 12 can be temporarily stored, and the induction voltage is prevented from being too high, thereby protecting other circuit components of the switching circuit 100. In some embodiments, diode 32 may be a fast recovery diode or a schottky diode, and the model number of diode 32 may be FR254, 1N5206, 1N5407, etc.

In the present embodiment, the driving circuit 50 is connected to a connection node between the anode 321 of the diode 32 and the controlled coil 12, the driving circuit 50 includes a transistor 52 and a first resistor R1, the collector c of the transistor 52 is connected to the anode 321 of the diode 32, the base b of the transistor 32 is connected to the first resistor R1, the emitter e of the transistor 52 is grounded, and the transistor 52 is used for controlling the on/off of the controlled coil 12. In this embodiment, transistor 52 may be an NPN transistor, and controlled coil 12 is turned on when transistor 52 outputs a high level, and controlled coil 12 is turned off when transistor 52 outputs a low level. In other embodiments, transistor 52 may be a PNP transistor, and controlled coil 12 is turned on when transistor 52 outputs a low level and controlled coil 12 is turned off when transistor 52 outputs a high level.

The first end 541 of the first resistor R1 is connected to the base b of the transistor, the second end 543 of the first resistor R2 is connected to the control pin, and the first resistor R1 performs the functions of voltage reduction and current limitation in the driving circuit 50. In some embodiments, the driving circuit 50 further includes a second resistor R2, one end of the second resistor R2 is connected to the connection node between the base b of the transistor and the first resistor R1, and the other end of the second resistor R2 is grounded, so that the driving circuit 50 can be protected.

Referring to fig. 3, in the present embodiment, the switch circuit 100 further includes a control chip 70, and the control chip 70 may include a first pin a and a second pin B. The first pin a is connected to the second end 543 of the first resistor R1 of the driving circuit 50, and the control chip 70 outputs a high/low level or/and a PWM signal to the relay 10 through the first pin a.

In the embodiment of the present application, after the control chip 70 receives the turn-on command, the control chip 70 is in the turn-on command state, the control chip 70 outputs a turn-on signal to the driving circuit (as shown in fig. 4), that is, the control chip 70 outputs a high level to the driving circuit 50, so that the relay 10 is turned on, and then after a predetermined time period, that is, after the relay 10 is in the complete turn-on state, the control chip 70 adjusts the output signal to the PWM signal, so as to reduce the power consumption of the controlled coil 12. In some embodiments, the predetermined time period may be 100ms, and in other embodiments, the first predetermined time period may be greater than 100ms, such as 200ms, 300ms, and so on. In the embodiment of the present application, the frequency of the PWM signal may be 2k, and the duty ratio may be 10%. After the control chip 70 receives the close command, the control chip 70 is in a close command state, and the control chip 70 outputs a close signal to the driving circuit (as shown in fig. 5), that is, the control chip 70 outputs a low level to the driving circuit 50, thereby turning off the relay 10.

Referring to fig. 3 again, in the present embodiment, the switch circuit 100 further includes a power supply circuit 90, the power supply circuit 90 is connected between the relay 10 and the control chip 70, and the power supply circuit 70 is used for supplying power to the control chip 70. In the embodiment of the present application, the first terminal 92 of the power supply circuit 90 is connected to the first terminal 121 of the controlled coil 12, the second terminal 94 of the power supply circuit is connected to the fourth pin B of the control chip 70, and the power supply circuit 70 supplies power to the control chip 70 through the second pin B.

In the embodiment, the switch circuit 100 further includes an on-state power circuit 60, the on-state power circuit 60 is connected between the relay 10 and the power supply circuit 70, and the on-state power circuit 60 is configured to turn on the power supply circuit 70 when the relay 10 is turned on. In the embodiment of the present application, the first terminal 62 of the on-state power-taking circuit 60 is connected to the first terminal 141 of the control terminal 14 of the relay 10, and the second terminal 64 of the on-state power-taking circuit 60 is connected to the power supply circuit 90, so that when the control chip 70 controls the relay 10 to be turned on, the on-state power-taking circuit 60 takes power to turn on the power supply circuit 90, so that the power supply circuit 90 supplies power to the control chip 70. Further, the control chip 70 outputs a high level to the driving circuit 50, so that the relay 10 is turned on, and then after a predetermined period of time, that is, after the relay 10 is in a complete on state, the control chip 70 adjusts the output signal to a PWM signal, so as to reduce the load of the on-state power-taking circuit 60.

In the embodiment, the switch circuit 100 further includes an off-state power circuit 40, the off-state power circuit 40 is connected between the relay 10 and the power supply circuit 70, and the off-state power circuit 40 is configured to turn on the power supply circuit 70 when the relay 10 is turned off. In the embodiment of the present application, the first terminal 42 of the off-state power-taking circuit 40 is connected to the second terminal 143 of the control terminal 14 of the relay 10, the second terminal 42 of the off-state power-taking circuit 40 is connected to the power supply circuit 90, and when the control chip 70 controls the relay 10 to be turned off, the off-state power-taking circuit 40 takes power to turn on the power supply circuit 90, so that the power supply circuit 90 supplies power to the control chip 70.

In some embodiments, the switch circuit 100 may further include a wireless communication unit 80, the wireless communication unit 80 is connected to the control chip 70 and is configured to establish a communication connection with an external communication device, and the control chip 70 may receive an on command or an off command through the wireless communication module 90. The external communication device may be, but is not limited to, an electronic device such as a remote controller, a mobile phone, a tablet computer, a desktop computer, etc. When an external communication device sends an on command or an off command to the control chip 70, the control chip 70 sends a control signal to the driving circuit 50 after receiving the command, so as to output a high/low level or/and a PWM signal to the relay 10 to control the state of the switching circuit 100. The wireless communication unit 90 may include at least one of the following: the device comprises a Bluetooth communication unit, a Wi-Fi communication unit and an infrared signal communication unit.

Referring to fig. 6, the present embodiment further provides an intelligent switch 200. The intelligent switch 200 includes any of the switching circuits 100 described above. In this embodiment, the intelligent switch 200 may be a single-hot-wire intelligent switch, the intelligent switch 200 may further include an indicator lamp 210 and an operation panel 230, the control chip 70 may further include a third pin C and a fourth pin D, the indicator lamp 210 is connected to the third pin C of the control chip 70, and the indicator lamp 210 may represent an on-off state of the switch circuit 100, for example, the indicator lamp 210 is turned on to represent that the switch circuit 100 is powered on, and the indicator lamp 210 is turned off to represent that the switch circuit 100 is powered off. The operation panel 230 may be a key, a touch screen, etc., the operation panel 230 is connected to the fourth pin D of the control chip 70, and the operation panel 230 may issue an on command or an off command to the control chip 230.

Referring to fig. 7, an embodiment of the present application further provides an intelligent home device 300. The smart home device 300 includes a smart switch 200 and a light emitting device 310 connected to the smart switch 200. In the embodiment of the present application, the light emitting device 310 is connected to the relay 10, specifically, the light emitting device 310 is connected to a connection node of the on-state power circuit 60 and the off-state power circuit 40, and the intelligent switch 200 can control the on/off of the light emitting device 310 through the switch circuit 100.

The switch circuit provided by the embodiment of the application, the follow current loop is connected to the controlled coil of the relay, and the energy stored in the controlled coil can be temporarily stored based on the follow current effect when the relay is disconnected, so that the switch circuit is protected, the driving circuit is connected to the controlled coil of the relay, and the on-off of the controlled coil can be controlled, so that the state of the control end is controlled to control the on-off of the external circuit, the power consumption requirements of the controlled coil and the switch circuit can be greatly reduced, the application range of the intelligent switch is expanded, and the cost of the intelligent switch is greatly reduced.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A switching circuit, comprising:

the relay is a monostable relay; the relay comprises a controlled coil and a control end, and the control end is used for controlling the on-off of an external circuit;

the two ends of the follow current loop are respectively connected with the two ends of the controlled coil of the relay; and

a drive circuit connected to the controlled coil of the relay.

2. The switching circuit of claim 1 wherein the freewheeling circuit includes a diode having a cathode connected to the first terminal of the controlled coil and an anode connected to the second terminal of the controlled coil, the driver circuit being connected to a connection node of the anode to the controlled coil.

3. The switching circuit according to claim 2, wherein the driving circuit comprises a transistor and a first resistor, a collector of the transistor is connected to an anode of the diode, and an emitter of the transistor is grounded; the first end of the first resistor is connected to the base electrode of the triode, and the second end of the first resistor is used for being connected with a control pin.

4. The switching circuit according to claim 3, wherein the driving circuit further comprises a second resistor, one end of the second resistor is connected to a connection node between the base of the transistor and the first resistor, and the other end of the second resistor is grounded.

5. The switching circuit according to claim 2, wherein the switching circuit further comprises a control chip, the control chip being connected to the driving circuit; the control chip is configured to output a high level signal to the driving circuit and adjust the signal to a PWM signal after keeping the high level signal for a predetermined time.

6. The switching circuit according to claim 5, further comprising a power supply circuit, a first terminal of the power supply circuit being connected to a connection node of the controlled coil and the cathode of the diode, and a second terminal of the power supply circuit being connected to the control chip.

7. The switching circuit according to claim 6, further comprising an on-state power-taking circuit connected between the control terminal of the relay and the power supply circuit.

8. The switch circuit of claim 7, wherein the switch circuit further comprises an off-state power circuit connected to the external circuit, the off-state power circuit being electrically connected to the power supply circuit; the first end of the closed state electricity taking circuit is connected to the control end of the relay, and the second end of the closed state electricity taking circuit is connected to the power supply circuit.

9. The switching circuit according to claim 6, further comprising a wireless communication module connected to the control chip, the wireless communication module adapted to establish a communication connection with an external communication device; the wireless communication module comprises at least one of the following units: the device comprises a Bluetooth communication module, a Wi-Fi communication module and an infrared signal communication module.

10. An intelligent switch is characterized in that the intelligent switch is a single-live-wire intelligent switch; the intelligent switch comprises a switching circuit as claimed in any one of claims 1 to 9.