WO2017148441A1

WO2017148441A1 - Switch control circuit and control method thereof

Info

Publication number: WO2017148441A1
Application number: PCT/CN2017/075641
Authority: WO
Inventors: 周永康
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-03-04
Filing date: 2017-03-03
Publication date: 2017-09-08
Also published as: CN107155246B; CN107155246A

Abstract

A switch control circuit and a control method thereof. The switch control circuit comprises: a power supply, a control circuit, an infrared sensor, and a relay. A power supply circuit is configured to convert an alternating current into a direct current and supply the direct current to the control circuit, the infrared sensor, and the relay; when the switch control circuit is in an active state, the control circuit controls the relay to be turned on or off according to a signal of the infrared sensor and determines, according to a switching frequency of the power supply from a powered state to an unpowered state, whether to switch the switch control circuit from the active state to a failure closed state. When the switch control circuit is in a failure closed state, the relay is controlled to be closed, and after the power supply is switched from the powered state to the unpowered state, the relay is turned off, and the switch control circuit is in a failure off state; the switch control circuit is switched to the active sate after the power supply is switched from the unpowered state to the powered state again.

Description

Switch control circuit and control method thereof

Technical field

The present disclosure relates to the field of communications, for example, to a switch control circuit and a control method thereof.

Background technique

Auto-sensing switches based on different technical principles have been widely installed in luminaires and equipment control. Wherein, the inductive switch based on the pyroelectric infrared sensor can be set to open and close the illumination of the lamp, for example, when someone enters the detection range of the infrared sensor, the switch is closed, the lamp is illuminated; when the person leaves the infrared The detection range of the sensor, the switch is turned off, and the light is automatically turned off. This way to achieve "on-demand lighting", to avoid the consumption of electrical energy, is an environmentally friendly control.

However, in some special application scenarios, the lighting fixture needs to be continuously illuminated in a short time. Even if there is no one in the detection area of the infrared sensor, the lamp cannot be extinguished. At this time, the above ordinary infrared induction automatic switch cannot meet the requirement.

Summary of the invention

The present disclosure provides a switch control circuit and a control method thereof, which can control an infrared induction automatic switch to be continuously closed in a short time.

A first aspect of the present disclosure provides a switch control circuit including: a power supply, a control circuit, an infrared sensor, and a relay; wherein the power source is configured to convert the alternating current into a direct current, to supply a control circuit, an infrared sensor, and a relay; When the switch control circuit is in an active state, the control circuit controls the relay to be closed or opened according to a signal from the infrared sensor, and determines whether the switch control circuit is switched from the active state to the fail-closed state according to the switching frequency of the power supply to the unpowered state; And when the switch control circuit is in a fail-closed state, the control circuit controls the relay to be closed. When the power supply is switched from the powered state to the unpowered state, the relay is turned off, the switch control circuit is in a fail-open state, and the power supply is again powered. Switching to the powered state, the switch control circuit transitions to an active state.

Optionally, the control circuit is configured to: when the number of times that the power source is powered to the unpowered state is less than the predetermined number of times, the switch control circuit is in an active state; and within a preset time period. The control circuit is in a fail-closed state when it is detected that the number of times the power source is supplied from the power supply to the no-power state reaches a predetermined number of times.

Optionally, the circuit further includes a wireless transceiver, wherein the control circuit is connected to the control terminal through the wireless transceiver, and receives a wireless control signal from the control terminal to control the relay to be closed or disconnected through the wireless transceiver; or the control circuit The state of the switch control circuit is switched according to the wireless control signal.

Optionally, the wireless control signal includes a timing table, where the timing table includes an action of controlling the relay and a time corresponding to the execution action.

Optionally, the control circuit is further configured to: when the wireless transceiver requests to query the infrared sensor for a valid range, obtain the detection result from the infrared sensor, and feed the detection result to the wireless transceiver.

Optionally, the infrared sensor is a pyroelectric infrared sensor, and the infrared sensor is configured to send an electrical signal to the control circuit after detecting the effective object within a predetermined range, and the control circuit is configured to control after receiving the electrical signal The relay is closed and the control relay is turned off when an electrical signal from the infrared sensor is not received.

A second aspect of the present disclosure provides a control method of a switch control circuit, including: controlling a switch control circuit to be closed or broken according to whether a valid object is detected within a specified range when the switch control circuit is in an active state After determining that the switch control circuit is switched from the active state to the fail-closed state according to the switching frequency of the switch control circuit from being powered to the unpowered state, the control switch control circuit is closed, the switch control circuit is switched to the fail-closed state; When the control circuit is in the fail-closed state, if the power supply in the switch control circuit is switched from being powered to the unpowered state, the switch control circuit is turned off, the switch control circuit is switched to the fail-open state, and the power supply is switched from the unpowered state. Until the power is supplied, the switch control circuit is switched to the active state.

Optionally, when the switch control circuit is in an active state, controlling whether the switch control circuit is closed or opened according to whether the active object is detected within the specified range, includes: detecting that the switch control circuit is closed within a preset time period The switch control circuit remains in an active state until the number of disconnections does not reach the predetermined number of times; and the control circuit switches to the failure condition when the number of times the switch circuit is detected from closed to open reaches a predetermined number of times within a preset period of time Closed state.

Optionally, the method further includes: controlling the switch control circuit to be closed or disconnected according to the received wireless control signal from the control terminal; or switching the state of the switch control circuit according to the wireless control signal, wherein the wireless control signal includes a timing table The timing table includes the actions of controlling the switch control circuit and the timing corresponding to the execution of the action.

Optionally, the foregoing method further includes: if the control terminal receives the query, whether the presence of the specified range exists When the effect is requested, the detection result is obtained from the infrared sensor in the switch control circuit, and the detection result is fed back to the control terminal. The solution provided by the embodiment of the present disclosure can determine the opening and closing of the switch circuit according to the power supply state of the switch control circuit, and can control the switch control circuit to continuously close in a short time.

DRAWINGS

1 is a schematic diagram of a switch control circuit according to Embodiment 1 of the present disclosure;

2 is a schematic diagram of a switch control circuit according to Embodiment 2 of the present disclosure;

3 is a schematic diagram of applying a switch control circuit in a lighting circuit in Embodiment 3 of the present disclosure;

4 is a flow chart of switching to a fail-closed state by a second switch control switch control circuit in Embodiment 3 of the present disclosure;

5 is a state transition diagram of an infrared sensing automatic switch in Embodiment 3 of the present disclosure;

6 is a flow chart of switching an infrared sensing automatic switch from a fail-closed state to an active state in Embodiment 4 of the present disclosure;

7 is a schematic diagram of applying an infrared sensing automatic switch to an illumination lamp circuit in Embodiment 4 of the present disclosure;

8 is a state transition diagram of a state switching of an infrared sensing automatic switch according to a change state command sent by an APP according to Embodiment 5 of the present disclosure;

9 is a state transition diagram of state switching of an infrared sensing automatic switch according to a timing table sent by an APP according to Embodiment 5 of the present disclosure;

10 is a schematic diagram of an APP interface when an infrared sensing automatic switch is in an active state according to Embodiment 5 of the present disclosure;

11 is a schematic diagram of an APP interface for displaying a setting timing table in Embodiment 5 of the present disclosure;

12 is a schematic diagram of an interface for querying an infrared sensing automatic switch state by an APP according to Embodiment 5 of the present disclosure;

13 is a schematic diagram of an APP interface when a plurality of infrared sensing automatic switches are in an active state in Embodiment 5 of the present disclosure;

14 is a schematic diagram of networking of an infrared sensing automatic switch by an APP in Embodiment 5 of the present disclosure;

Figure 15 is a flowchart of a control method of a switch control circuit in Embodiment 6 of the present disclosure.

detailed description

The present disclosure will be described in detail below with reference to the accompanying drawings and embodiments. The embodiments described herein are merely illustrative of the disclosure and are not limiting of the disclosure. The technical features in the following embodiments and the embodiments may be arbitrarily combined with each other without conflict.

Example 1

This embodiment provides a switch control circuit. FIG. 1 is a schematic diagram of the control circuit. As shown in FIG. 1, the switch control circuit includes: a power supply, a control circuit, an infrared sensor, and a relay. The power supply is set to convert the alternating current into direct current, and is supplied to the control circuit, the infrared sensor and the relay; when the switch control circuit is in an active state, the control circuit controls the relay to be closed or opened according to the signal from the infrared sensor, and is powered according to the power source. The switching frequency of the unpowered state determines whether the switch control circuit is switched from the active state to the fail-closed state; when the switch control circuit is in the fail-closed state, the control circuit controls the relay to be closed, and when the power supply is switched from the powered state to the unpowered state, the relay When disconnected, the switch control circuit is in a fail-open state, and the switch control circuit is switched to the active state after the power supply is switched from the no-power state to the powered state. Wherein, in the fail-closed state and the fail-open state of the switch control circuit, the control circuit does not control the relay to be closed or opened according to the signal of the infrared sensor, and the control circuit is based on the between the powered state and the unpowered state of the power supply. Switch the control relay to close or open.

Optionally, the control circuit is configured to: when the number of times that the power source is powered to the unpowered state is less than the predetermined number of times, the switch control circuit is in an active state; and within a preset time period. The control circuit is in a fail-closed state when it is detected that the number of times the power supply has been supplied to the unpowered state reaches a predetermined number of times.

The switch control circuit may further include a wireless transceiver (also referred to as a wireless module), wherein the control circuit is connected to the control terminal through the wireless transceiver, and receives a wireless control signal from the control terminal through the wireless transceiver to control the relay to close or Disconnected; or the control circuit switches the state of the switch control circuit in accordance with the wireless control signal. The switching of the state of the switch control circuit includes switching between an active state, a fail-closed state, and a fail-open state. Optionally, the wireless signal may further include a timing table, and the timing table includes an action of the control relay and an execution action corresponding to Moment.

Optionally, the above control circuit is further configured to request the infrared sensor to query the infrared sensor When there is a valid object in the range, the detection result is obtained from the infrared sensor, and the detection result is fed back to the wireless transceiver, and the wireless transceiver notifies the control terminal to the control terminal, so that the user can control the switch control according to the detection result of the control terminal receiving. The state of the circuit.

Optionally, the infrared sensor in this embodiment is a pyroelectric infrared sensor, and the infrared sensor is configured to send an electrical signal to the control circuit after the active object is detected within a predetermined range, and the control circuit is configured to receive The control relay is closed after the electrical signal is applied, and the control relay is turned off when an electrical signal from the infrared sensor is not received.

The solution provided by the embodiment is simple in operation, low in cost, energy-saving, rich in functions, convenient and fast, and can be applied to commercial places such as offices, classrooms, and commercial halls, and can also be applied to households, and is an electrical device capable of realizing smart home.

Example 2

2 is a schematic diagram of a switch control circuit according to Embodiment 2 of the present disclosure. As shown in FIG. 1 and FIG. 2, the switch control circuit, also referred to as an infrared induction automatic switch, may include a pyroelectric infrared sensor, a power supply, and a control circuit. , a wireless transceiver, a relay, a first switch, and application software for controlling the terminal (not shown).

Among them, the power supply can be set to rectify 220V AC voltage to 5V and 3.3V DC, and supply power to pyroelectric infrared sensors, relays, control circuits and wireless transceivers. The application software of the control terminal is connected to the infrared sensor automatic switch wirelessly, and the infrared sensor automatic switch can also be wirelessly connected to the wireless router.

The control circuit is the core of the infrared induction automatic switch, and can receive the signal of the pyroelectric infrared sensor, the instruction of the wireless transceiver, and the power-off and power-on times information of the power source, and send a control electric signal to the relay through logic judgment, and control the first The switch is opened or closed. The relay itself may include a switch, and the first switch of the present disclosure may be a switch in the relay.

Optionally, the wireless transceiver in this embodiment adopts Wireless Fidelity (WiFi) wireless technology to facilitate connection with most smart phones supporting WiFi technology.

The pyroelectric infrared sensor generates an electrical signal after detecting a human or an animal within a certain range, and after receiving the electrical signal, the control circuit logically determines that the first switch is closed by the relay; and the pyroelectric infrared sensor No human or animal is detected within its detection range, no electrical signal is generated, and the control circuit is logically determined to control the first switch to be turned off by the relay.

Optionally, the switch control circuit has a counting function, a state memory function (the state that remains stored after the power is off is not lost), a storage function, and a timing function. The states memorized by the switch control circuit include an active state, a fail-closed state, and a fail-open state, which are consistent with the state in the above-described Embodiment 1, and the switch control circuit can only be in one of three states at a time. When the switch control circuit is in the active state, within the preset time (for example, 15 seconds) (the power can still be timed), if the control circuit detects the 5V DC output of the power supply, "power off to power on" once, the status counter When the state counter reaches the preset number threshold (for example, 3), the control circuit outputs an electrical signal. After receiving the electrical signal, the relay controls the first switch to close, and the infrared sensing automatic switch enters a fail-closed state. The first switch will not open regardless of whether there is a person or an animal within the detection range of the pyroelectric infrared sensor. Optionally, if the first switch is closed, if the power supply does not output 5V direct current (power off), the relay cannot control the first switch to close, the first switch is turned off, and the infrared induction automatic switch enters an active state.

Example 3

In this embodiment, an infrared induction automatic switch as provided in Embodiment 1 and Embodiment 2 is added to the illumination circuit to form an illumination circuit with infrared induction automatic switch control, as shown in FIG.

When the detection distance of the pyroelectric infrared sensor in this embodiment is 6 meters, if the illumination lamp is 2.5 meters away from the ground, an infrared induction automatic switch can control a circular area with a radius of 5.5 meters. Within this range, a suitable number of illuminators (e.g., three illuminators in Figure 3) are mounted on the ceiling and controlled by an infrared-sensing automatic switch.

The second switch in this embodiment is configured to switch the infrared sensing automatic switch to a fail-closed state. For example, within 15 seconds, the second switch continuously switches from off to closed three times in the pyroelectric infrared sensor. The illumination of the infrared-sensing automatic switch is always on, regardless of whether there is a person or an animal within the detection range. The control flow is shown in Figure 4 and includes the following steps:

The second switch is closed, and the infrared sensing automatic switch is in an active state, the value of the counter in the control circuit is 0, and the first switch is in an off state;

Disconnecting the second switch, immediately closing the second switch, and the control circuit detects that the 5V DC output of the power supply is "switched from power-off to power-on" once;

The control circuit determines whether the status counter is 0. If the status counter is 0, the timer is cleared, the 15 second timing is started, and the next step is entered; if not, the next step is entered;

The control circuit determines if the timer has reached 15 seconds: if it is 15 seconds, the status counter is cleared. Zero, end; if not 15 seconds, go to the next step;

The status counter is incremented by one;

The control circuit determines whether the status counter is equal to 3, if the status counter is not equal to 3, returns to the step of disconnecting the second switch; if the status counter is equal to 3, proceeds to the next step;

The control circuit outputs an electric signal, and after receiving the electric signal, the relay controls the first switch to be closed, and the illumination light controlled by the infrared induction automatic switch is illuminated, and the infrared induction automatic switch enters a fail-closed state, and the pyroelectric infrared sensor detects the range at this time. No matter whether someone or an animal, does not affect the state of the light, go to the next step;

The status calculator is cleared.

The state transition diagram of the infrared sensing automatic switch is shown in Figure 5.

Embodiment 3 of the present disclosure can switch the infrared induction automatic switch to the single-pole single-throw switch, which can meet the requirement that all the illumination lamps need to be always bright in some occasions.

In this embodiment, the infrared switch automatic switch is switched from the fail-closed state to the active state, the second switch can be turned off, and then the second switch can be closed at any time. The control flow is as shown in FIG. The state transition diagram is shown in Figure 5. The process shown in Figure 6 can include the following steps:

The infrared sensing automatic switch is in a fail-closed state or a failed-open state;

Disconnecting the second switch, since the relay is not powered, the first switch cannot be controlled to be closed, so the first switch is turned off;

When the second switch is closed, the infrared sensing automatic switch enters an active state.

Example 4

In this embodiment, a plurality of illumination lamps can be controlled, and the number and position of the required infrared induction automatic switches can be calculated according to a circular area with a control radius of 5.5 meters of an infrared induction automatic switch. The circuit schematic is shown in FIG. 7.

Among them, in addition to controlling the main power supply to open and close, the main switch can also be set to control the switching between all the infrared sensing automatic switches in the active state and the fail-closed state.

When all the second switches are in the closed state, the total switch can be switched from "off to close" three times in 15 seconds. All infrared sensors are detected within the detection range of all pyroelectric infrared sensors, whether or not there are people or animals. The illumination of the automatic switch control is not extinguished, and the switching process is the same as that in the first embodiment. kind.

In this embodiment, all of the infrared sensing switches are switched from the fail-closed state to the active state, the main switch can be turned off, and then the main switch can be closed.

In this embodiment, the state switching of the plurality of infrared sensing automatic switches can be performed, thereby avoiding the operation of “opening to closing” of the second switch one by one, thereby improving the control efficiency.

Example 5

In this embodiment, the control circuit can be automatically interconnected with the smart phone application (Application, APP) through the wireless transceiver via the wireless transceiver, and the smart phone APP can control the infrared induction automatic switch.

The smartphone app can send four commands: changing the status command, querying the command, turning the light on or off, and setting the timer command.

The three states of the infrared sensing automatic switch (active state, fail-closed state, and fail-opened state) can be switched by the change state command sent by the smart phone APP, and the partial light can be switched on or off. The state transition diagram is shown in Figure 8, and the APP interface is shown in Figures 10, 11 and 12.

The smart phone APP can set the timing meter and the corresponding opening and closing action for the infrared sensing automatic switch. When the timing time is up, the infrared sensing automatic switch automatically changes the state according to the action set in the timing table. Its state transition diagram is shown in Figure 9.

The smart phone APP can be used at the near end, and can remotely query and change the state of one or more infrared sensing automatic switches through the Internet, and can also query the data stored by the infrared sensing automatic switch, such as the time and duration of the disconnection of the first switch. And the time and duration of the closure, as well as the statistics of electricity consumption.

The smart phone APP can be used at the near end and remotely through the Internet to check whether there is a person or an animal in the control range of one or more infrared sensing automatic switches, thereby determining whether a light-off operation is required. The schematic diagram of the APP interface is shown in Figure 13. When some people or animals are in the range controlled by the infrared induction automatic switch, the infrared induction automatic switch can be displayed in red (the infrared sensing automatic switch 2 and the infrared sensing in the background of the dot in Fig. 13) Automatic switch 4) and flashes.

If the infrared sensor automatic switch needs to be connected to the wireless router, the smart phone APP sends the wireless router's wireless local area network (WLAN) connection name and password to the wireless transceiver, and the control circuit receives the WLAN connection name and password. Save once it is detected The wireless router's WiFi signal can be automatically connected to the wireless router. As shown in Figure 14, the corresponding settings can be made through WiFi and networking buttons. Among them, click the WiFi button, the smart phone can send the wireless router's WLAN connection name and password to the wireless circuit; click the network button, the smart phone can indicate the infrared sensor automatic switch to access the Internet through WiFi.

In this embodiment, the smart phone APP realizes the query and control of the near-end and the remote infrared-sensing automatic switch. When the user forgets to turn off the light before going out, the light can be remotely controlled, and the light can be turned on when no one is at home. Thieves, and meet the needs of user statistics and electricity consumption data.

The solution of the embodiment adopts a pyroelectric infrared sensor to realize the "on-demand illumination" automatic switching function, which saves electric energy and avoids unnecessary loss; and can be performed by means of manual, smart phone APP (near end and remote) and timing meter Switching and control between the three states, to meet the "Changming", smart phone APP to turn on the lights, turn off the lights (can check whether there are people under the lights before turning off the lights), smart phone APP setting timer, batch turn off lights, remote Operational and statistical data requirements.

Example 6

This embodiment provides a switch control circuit control method, and FIG. 15 is a flowchart of the method.

In step 110, when the switch control circuit is in an active state, the switch control circuit is controlled to be closed or opened depending on whether or not the active is detected within the specified range.

In step 120, after determining that the switch control circuit is switched from the active state to the fail-closed state according to the switching frequency of the switch control circuit from being powered to the no-power state, the control switch control circuit is closed and the switch control circuit is switched to the fail-closed state.

In step 130, in the process that the switch control circuit is in the fail-closed state, if the power supply in the switch control circuit is switched from the power supply to the no-power supply state, the switch control circuit is turned off, and the switch control circuit is switched to the fail-open state. After the power supply is switched from the unpowered state to the powered state, the switch control circuit is switched to the active state.

When the switch control circuit is in an active state, controlling whether the switch control circuit is closed or opened according to whether the effective object is detected within the specified range may include: detecting that the switch circuit is closed to open within a preset time period In the case where the number of times does not reach the predetermined number of times, the switch control circuit remains in an active state; and in the case where the number of times the switch control circuit is detected to be closed to the predetermined number of times is reached within a preset period of time, the control circuit shifts to the fail-closed state.

The above method may further include: controlling to open according to the received wireless control signal from the control terminal The control circuit is closed or disconnected; or the state of the switch control circuit is switched according to the wireless control signal, wherein the wireless control signal includes a timing table, and the timing table includes an action of controlling the switch control circuit and a time corresponding to the execution of the action.

The method further includes: when receiving the request for the control terminal to query whether there is a valid object within the specified range, acquiring the detection result from the infrared sensor in the switch control circuit, and feeding back the detection result to the control terminal.

Industrial applicability

A switch control circuit and a control method thereof are provided in an embodiment of the present disclosure, which can control the switch control circuit to continuously close in a short time.

Claims

A switch control circuit comprising:

Power supply, control circuit, infrared sensor and relay; among them,

The power source is configured to convert alternating current into direct current, to supply the control circuit, the infrared sensor, and the relay; and when the switch control circuit is in an active state, the control circuit is based on the infrared sensor Signaling that the relay is closed or opened, determining whether the switch control circuit is transitioned from an active state to a fail-closed state according to a switching frequency of the power supply to a no-power state; and the switch control circuit is in a fail-closed state In the state, the control circuit controls the relay to be closed. When the power source is switched from the powered state to the unpowered state, the relay is turned off, and the switch control circuit is in a fail-open state, and the power supply is further Switching from the no-power state to the powered state, the switch control circuit transitions to an active state.
The circuit according to claim 1, wherein said control circuit is configured to: in the case where it is detected within a preset period of time that the number of times the power source has been supplied to the unpowered state has not reached a predetermined number of times, the switch The control circuit is in an active state; and the control circuit is in a fail-closed state in the event that the number of times the power source has been powered to the unpowered state is detected for a predetermined number of times during the predetermined period of time.
The circuit of claim 1 further comprising a wireless transceiver, wherein said control circuit is coupled to the control terminal via said wireless transceiver and receives wireless control signal control from said control terminal via said wireless transceiver The relay is closed or opened; or the control circuit switches the state of the switch control circuit in accordance with the wireless control signal.
The circuit according to claim 3, wherein said wireless control signal includes a timing table including an action of controlling said relay and a timing at which said action is performed.
The circuit of claim 3 wherein said control circuit is further configured to: from said red when said wireless transceiver requests to query for a valid range within said specified range of said infrared sensor The outer sensor acquires the detection result, and feeds the detection result to the wireless transceiver.
The circuit of claim 1 wherein said infrared sensor is a pyroelectric infrared sensor, said infrared sensor being arranged to transmit an electrical signal to said control circuit after detecting an active object within a predetermined range, And the control circuit is configured to control the relay to close after receiving the electrical signal, and to control the relay to open when an electrical signal from the infrared sensor is not received.
A control method for a switch control circuit includes:

When the switch control circuit is in an active state, the switch control circuit is controlled to be closed or opened according to whether a valid object is detected within a specified range;

Controlling the switch control circuit to close after switching the switch control circuit from the active state to the fail-closed state according to the switching frequency of the switch control circuit from being powered to the no-power state, the switch control circuit transitioning to the failure Closed state;

In the process that the switch control circuit is in a fail-closed state, if the power supply in the switch control circuit is switched from being powered to a no-power state, the switch control circuit is turned off, and the switch control circuit is switched to fail-open In a state, the power supply is switched from the unpowered state to the powered state, and the switch control circuit is switched to the active state.
The method according to claim 7, wherein said controlling said switch control circuit to be closed or opened according to whether said active object is detected within a specified range when said switch control circuit is in an active state comprises:

The switch control circuit remains in an active state if the number of times the switch control circuit is detected to be closed to off a predetermined number of times within a preset period of time; and the detected in the preset time period In the case where the number of times the switch control circuit is closed to open reaches a predetermined number of times, the control circuit switches to a fail-closed state.
The method of claim 7 further comprising:

Controlling the switch control circuit to be closed or disconnected according to the received wireless control signal from the control terminal; or switching the state of the switch control circuit according to the wireless control signal, wherein the wireless control signal includes a timing table, The timing table includes an action of controlling the switch control circuit and a time at which the action is performed.
The method of claim 7 further comprising:

When receiving the request for the control terminal to query whether there is a valid object within the specified range, the detection result is obtained from the infrared sensor in the switch control circuit, and the detection result is fed back to the control terminal.