CN217060784U - Switching circuit and intelligent switch - Google Patents

Referring to fig. 1, fig. 1 schematically illustrates a structural schematic diagram of a

100 according to an embodiment of the present disclosure. The

100 includes a

10, a

30, and a

50. The

10 includes a controlled

12 and a

14, wherein the

14 is used for controlling the on/off of the

101. In the embodiment of the present application, the

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

30 has both ends connected to both ends of the controlled

12, respectively, and the

30 is used to temporarily store energy stored in the controlled

12 based on a freewheel action when the

10 is turned off, thereby protecting the

100. The

50 is connected to the controlled

12, and the

50 can control the on/off of the controlled

12, thereby controlling the state of the

14. In some embodiments, the

50 transmits a turn-on control signal (e.g., an input voltage or current) to the controlled

12, so that the controlled

12 is powered on, and the controlled

12 generates an electromagnetic force to control the contact connection of the

14, so that the

101 is turned on; the

50 transmits a turn-off control signal to the controlled

12, so that the controlled

12 is powered off, the electromagnetic force generated by the controlled

12 disappears, the contact of the

14 is disconnected, and the

101 is disconnected.

In the

100 provided in the embodiment of the present application, the

30 is connected to the controlled

12 of the

10, and can temporarily store the energy stored in the controlled

12 based on the freewheeling action when the

10 is turned off, so as to protect the

100, the

30 is connected to the controlled

12 of the

10, and can control the state of the

14 by controlling the on/off of the controlled

12 to control the on/off of the

101, so as to reduce the power consumption of the controlled

12 and the

100. Further, the

10 is a monostable relay, which can reduce the cost of the

100.

Referring to fig. 2, in the embodiment of the present application, the controlled

12 has a

121 and a

123, and the

121 and the

123 are respectively connected to two ends of the

30. When the controlled

12 is energized, the controlled

12 generates electromagnetic force to control the contact of the

141 to be connected with the contact of the

143, so that the

141 and the

143 of the

14 are conducted, that is, the

10 is conducted, and the

101 is conducted. When the controlled

12 is de-energized, the electromagnetic force generated by the controlled

12 disappears, which results in the disconnection between the contact of the

141 and the contact of the

143, and thus the

141 and the

143 of the

14 are disconnected, i.e., the

10 is opened, so that the

101 is opened.

In the present embodiment, the

30 is connected between the

10 and the

50, the

30 includes the

32, the

32 includes the

321 and the

323, and the

321 and the

323 are connected to the controlled

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

100, thereby protecting the

100 when the

10 is disconnected. Specifically, the

323 of the

32 is connected to the

121 of the controlled

12, and the

321 of the

32 is connected to the

123 of the controlled

12, since a large amount of energy is stored when the controlled

12 is powered on, a back electromotive force is generated when the controlled

12 is powered off, and other components in the

100 are easily broken down, at this time, since the

32 is connected in a direction exactly the same as the direction of the back electromotive force, the energy stored in the controlled

12 can be temporarily stored, and the induction voltage is prevented from being too high, thereby protecting other circuit components of the

100. In some embodiments,

32 may be a fast recovery diode or a schottky diode, and the model number of

32 may be FR254, 1N5206, 1N5407, etc.

In the present embodiment, the

50 is connected to a connection node between the

321 of the

32 and the controlled

12, the

50 includes a

52 and a first resistor R1, the collector c of the

52 is connected to the

321 of the

32, the base b of the

32 is connected to the first resistor R1, the emitter e of the

52 is grounded, and the

52 is used for controlling the on/off of the controlled

12. In this embodiment,

52 may be an NPN transistor, and controlled

12 is turned on when

52 outputs a high level, and controlled

12 is turned off when

52 outputs a low level. In other embodiments,

52 may be a PNP transistor, and controlled

12 is turned on when

52 outputs a low level and controlled

12 is turned off when

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

50. In some embodiments, the

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

50 can be protected.

Referring to fig. 3, in the present embodiment, the

100 further includes a

70, and the

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

50, and the

70 outputs a high/low level or/and a PWM signal to the

10 through the first pin a.

In the embodiment of the present application, after the

70 receives the turn-on command, the

70 is in the turn-on command state, the

70 outputs a turn-on signal to the driving circuit (as shown in fig. 4), that is, the

70 outputs a high level to the

50, so that the

10 is turned on, and then after a predetermined time period, that is, after the

10 is in the complete turn-on state, the

70 adjusts the output signal to the PWM signal, so as to reduce the power consumption of the controlled

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

70 receives the close command, the

70 is in a close command state, and the

70 outputs a close signal to the driving circuit (as shown in fig. 5), that is, the

70 outputs a low level to the

50, thereby turning off the

10.

Referring to fig. 3 again, in the present embodiment, the

100 further includes a

90, the

90 is connected between the

10 and the

70, and the

70 is used for supplying power to the

70. In the embodiment of the present application, the

92 of the

90 is connected to the

121 of the controlled

12, the

94 of the power supply circuit is connected to the fourth pin B of the

70, and the

70 supplies power to the

70 through the second pin B.

In the embodiment, the

100 further includes an on-

60, the on-

60 is connected between the

10 and the

70, and the on-

60 is configured to turn on the

70 when the

10 is turned on. In the embodiment of the present application, the

62 of the on-state power-taking

60 is connected to the

141 of the

14 of the

10, and the second terminal 64 of the on-state power-taking

60 is connected to the

90, so that when the

70 controls the

10 to be turned on, the on-state power-taking

60 takes power to turn on the

90, so that the

90 supplies power to the

70. Further, the

70 outputs a high level to the driving

50, so that the

10 is turned on, and then after a predetermined period of time, that is, after the

10 is in a complete on state, the

70 adjusts the output signal to a PWM signal, so as to reduce the load of the on-state power-taking

60.

In the embodiment, the

100 further includes an off-

40, the off-

40 is connected between the

10 and the

70, and the off-

40 is configured to turn on the

70 when the

10 is turned off. In the embodiment of the present application, the

42 of the off-state power-taking

40 is connected to the

143 of the

14 of the

10, the

42 of the off-state power-taking

40 is connected to the

90, and when the

70 controls the

10 to be turned off, the off-state power-taking

40 takes power to turn on the

90, so that the

90 supplies power to the

70.

In some embodiments, the

100 may further include a

80, the

80 is connected to the

70 and is configured to establish a communication connection with an external communication device, and the

70 may receive an on command or an off command through the

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

70, the

70 sends a control signal to the driving

50 after receiving the command, so as to output a high/low level or/and a PWM signal to the

10 to control the state of the

100. The

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

200. The

200 includes any of the switching

100 described above. In this embodiment, the

200 may be a single-hot-wire intelligent switch, the

200 may further include an

210 and an

230, the

70 may further include a third pin C and a fourth pin D, the

210 is connected to the third pin C of the

70, and the

210 may represent an on-off state of the

100, for example, the

210 is turned on to represent that the

100 is powered on, and the

210 is turned off to represent that the

100 is powered off. The

230 may be a key, a touch screen, etc., the

230 is connected to the fourth pin D of the

70, and the

230 may issue an on command or an off command to the

230.

Referring to fig. 7, an embodiment of the present application further provides an

300. The

300 includes a

200 and a

310 connected to the

200. In the embodiment of the present application, the

310 is connected to the

10, specifically, the

310 is connected to a connection node of the on-

60 and the off-

40, and the

200 can control the on/off of the

310 through the

100.

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.