An electronic two-way switch and system thereof

Abstract

The present invention relates to an electronic two-way switch and a system thereof. The electronic two-way switch comprises an on-state power supply circuit, an off-state power supply circuit, a control signal generating circuit, a state indicating circuit, a control circuit, a single-pole double-throw relay and a drive circuit. The output end of the control circuit is connected to the drive circuit, and is used to change the active end position of the single-pole double-throw relay through the drive circuit connected to the relay drive coil. The two-wire electronic two-way switch of the present invention can perfectly replace the traditional mechanical two-way switch, and can be directly replaced without changing the wiring. At the same time, it can support wireless remote control, work stably, and has strong anti-interference ability.

Description

Technical Field

[0001] The invention relates to an electronic switch, in particular to a two-wire electronic two-way switch and a switch system using the electronic two-way switch. Background Art

[0002] There are two main types of existing electronic two-way switches: one is a two-way switch with a neutral line; the other is a single-fire electronic switch. For example, a solution is proposed in the Chinese patent with patent number CN107241089A. A capacitive touch button is used to determine whether someone is operating through the logic processing of the single-chip microcomputer program, and then the switch actuator is driven to control the lamp through the single-chip microcomputer instruction. In addition to determining whether someone is operating to drive the switch actuator to control the lamp, the single-chip microcomputer will also modulate a two-way switch synchronization signal and transmit it to the outside through the two-way switch synchronization modulation and demodulation circuit. When two or more two-way switches are connected together, all two-way switches receive the two-way switch synchronization signal through the two-way switch synchronization modulation and demodulation circuit, and then input it into the single-chip microcomputer. The single-chip microcomputer demodulates the two-way switch synchronization signal to analyze the state of the two-way switch, and then drives the switch actuator to control the lamp through the single-chip microcomputer instruction. The switch realizes single-fire power supply in the "off" and "on" states through the RCC state power supply circuit and the open state power supply circuit.

[0003] The above scheme uses one of the two wires used for the two-way switch connection for synchronous communication, so it is essentially to connect multiple single-control electronic switches in series, assist synchronization through communication, and realize multi-point control. In actual use, the two wires of the two-way connection are the same color, and there is no problem with blind connection of mechanical switches; but according to the above technical scheme, there is a 50% probability that the product will not work properly after the user blindly connects, and the probability of error is higher if more switches are connected. When wiring this connection method, the connection line used for synchronous communication is parallel to the strong wire for load power supply, which is susceptible to interference from the power grid, causing communication abnormalities. In order to realize multi-point control, multiple single-control electronic switches need to be connected in series. This connection will cause the off-state circuit power supply voltage to decrease as the number of switches increases until it cannot work; in addition, since one of the two-way wires is dedicated to synchronous communication, the switch is not compatible with existing traditional mechanical switches.

[0004] The above solution also has serious defects. When multiple two-way switches are used in series, if one of the electronic two-way switches fails, the products on the entire line will not work properly. Moreover, users cannot easily find the faulty product when troubleshooting, and need to disassemble and test the products one by one. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a two-wire electronic two-way switch.

[0006] The electronic two-way switch described in the present invention comprises: an on-state power supply circuit, an off-state power supply circuit, a control signal generating circuit, a control circuit, a single-pole double-throw relay and a drive circuit, wherein the output end of the control circuit is connected to the drive circuit and is used to change the position of the active end of the single-pole double-throw relay through the drive circuit connected to the relay drive coil; the characteristic is that the control signal generating circuit is connected to the input end of the control circuit to start the control circuit of the single-pole double-throw relay, the on-state power supply circuit and the off-state power supply circuit are used to supply power to the load and the control circuit, and at least one detection circuit for detecting the power supply state of the on-state power supply circuit or the off-state power supply circuit is provided, and the detection circuit is connected to the control circuit; the control circuit continuously monitors the power supply state of the load through the detection circuit; when receiving the control signal input by the control signal generating circuit, the control circuit first determines the state of the detection circuit and then issues a corresponding control instruction.

[0007] Preferably, the on-state power supply circuit power supply state detection circuit or the off-state power supply circuit power supply state detection circuit includes a voltage dividing resistor connected in series between the on-state power supply circuit or the off-state power supply circuit and the ground wire, and the midpoint of the voltage dividing resistor is connected to the signal input end of the control circuit.

[0008] The power supply state detection circuit of the on-state power supply circuit or the power supply state detection circuit of the off-state power supply circuit is connected to the power supply input terminal of the control circuit through a series isolation diode.

[0009] Preferably, at least one of the control signal generating circuits includes a wireless receiving module for remote control.

[0010] Preferably, the control signal generating circuit has at least one local manual operation device.

[0011] Preferably, it also includes a status indication circuit connected to the control circuit, and the control circuit controls the status of the status indication circuit in real time through the signal detected by the detection circuit to display the connection and closing of the load power supply circuit.

[0012] Preferably, the status indication circuit includes a wireless transmission module for transmitting the working status of the electronic two-way switch to the outside in real time.

[0013] Specifically, the local manual operation device includes a touch switch or a mechanical switch or a micro switch.

[0014] The present invention also provides a two-way switch system, comprising a plurality of two-way switches and a remote control device, and each two-way switch is connected in series to control the same load, characterized in that: at least one of the plurality of two-way switches adopts the above-mentioned electronic two-way switch. When any two-way switch in the two-way switch system receives an operation signal, the corresponding single-pole double-throw relay switches once and sets its position. If there is a corresponding control circuit, the control circuit confirms the power supply state of the on-state or off-state power supply circuit through the detection circuit, and then determines the on / off state of the load power supply circuit and records it; if there is another identical electronic two-way switch in the system, its control circuit also confirms the power supply state of the on-state or off-state power supply circuit through the detection circuit, and then determines the on / off state of the load power supply circuit and records it. When any electronic two-way switch receives a control instruction, its control circuit compares the control instruction with the recorded circuit status, determines whether to control the corresponding single-pole double-throw relay to switch once and set its position, if the instruction is the same as the circuit status, then does not act, otherwise controls the corresponding single-pole double-throw relay to switch once and set its position.

[0015] Preferably, the electronic two-way switch displays the detected on / off state of the load power supply circuit in real time through a state indicating circuit.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) the electronic two-way switch has a simple structure and convenient wiring, is directly compatible with traditional mechanical switches, does not need to change the wiring of traditional mechanical switches, and has high working reliability; (2) in the electronic two-way switch system, each two-way switch is connected in series and works independently, and can achieve state intercommunication without signal connection. If one switch is damaged, it will not affect the operation of other switches and loads, which is convenient for repair and maintenance; (3) the two-way switch system can conveniently add mid-way switches at any time to realize infinite multi-point control. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a principle block diagram of the electronic two-way switch of the present invention;

[0018] Figure 2 It is a principle block diagram of a preferred embodiment of the electronic two-way switch of the present invention;

[0019] Figure 3 It is a schematic diagram of a preferred embodiment of the electronic two-way switch of the present invention;

[0020] Figure 4 It is a block diagram of an embodiment of the electronic dual-way switch system using two switches connected in series. DETAILED DESCRIPTION

[0021] In order to facilitate understanding by those skilled in the art, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, the electronic two-way switch of the present invention comprises an on-state power supply circuit, an off-state power supply circuit, a control signal generating circuit, a control circuit, a single-pole double-throw relay, a drive circuit and a state indicating circuit. The output end of the control circuit is connected to the drive circuit, and is used to change the position of the active end of the single-pole double-throw relay through the drive circuit connected to the relay drive coil; the two ends of the off-state power supply circuit are respectively connected to the two fixed ends of the relay; at least one control signal generating circuit is connected to the input end of the control circuit, and is used to start the control circuit to control the relay. Among them, the control signal generating circuit can be a button sensor, touch sensor, human body sensor, infrared remote control, wireless control and other circuits. Figure 1 In the embodiment, at least one of the on-state power supply circuit and the off-state power supply circuit is internally provided with a detection circuit connected to the control circuit 1.6 for detecting the on-off of the load power supply circuit.

[0023] like Figure 2 This is a preferred embodiment of the electronic two-way switch of the present invention. The electronic two-way switch in this embodiment includes an on-state power supply circuit 1.2, an off-state power supply circuit 1.1, a control signal generating circuit 1.5, a control circuit 1.6, a single-pole double-throw relay 1.3, a drive circuit 1.4 and a state indicating circuit 1.7. In this embodiment, an on-state detection circuit 1.8 and an off-state detection circuit 1.11 are respectively provided to monitor the on-state power supply circuit 1.2 and the off-state power supply circuit 1.1. The on-state detection circuit 1.8 or the off-state detection circuit 1.11 is respectively connected to the power input terminal of the control circuit 1.6 through a series isolation diode to avoid mutual interference. The control circuit 1.6 can control the state display of the indicator light (state indicating circuit) according to the detection result of the on-state detection circuit 1.8 or the off-state detection circuit 1.11. This electronic two-way switch can be wirelessly invited and wirelessly send status information, that is, the status indication circuit can be an indicator light, or a wireless transmission module, or an integrated indicator light and wireless transmission module function, which is used to transmit the working status of the control circuit and transmit the status to the outside. The indicator light is convenient for on-site viewing, and the wireless transmission module is convenient for remote monitoring. The control signal generating circuit 1.5 includes the local mobile phone operation panel and the wireless receiving module. For example, the mobile phone initiates a status query invitation to the electronic two-way switch through the APP, and the switch control circuit sends the detection results to the mobile phone, which is convenient for the operator to view and monitor remotely, avoid the situation where no one is there but the load is open, and save electricity.

[0024] Figure 3 for Figure 2 The circuit principle diagram of the embodiment shown is as follows. Figure 2 , 3As shown, the state detection circuit is set for the on-state power supply circuit and the off-state power supply circuit respectively. The electronic two-way switch comprises L live wire, L1 output terminal, L2 output terminal, 1.1 off-state power supply circuit, 1.2 on-state power supply circuit, 1.3 relay, 1.4 relay drive circuit, 1.5 control signal generating circuit, 1.6 control circuit, 1.7 LED state indication circuit, 1.8 on-state detection circuit, 1.9 isolation diode D6, 1.10 isolation diode D4, 1.11 off-state detection circuit, and the specific connection relationship is shown in FIG. Figure 3 As shown. The live wire L of the power supply is connected to the load output L2 terminal through the open-state power supply circuit 1.2 and the normally closed contact of the relay in turn, and at the same time, it is connected to the open-state power supply circuit 1.2 and the output of the voltage regulator U5 in turn to provide working power for the control chip. At this time, the load circuit is connected and the load is turned on. The open-state detection circuit includes series resistors R12 and R13, the other end of R12 is connected to the VB end of the open-state power supply circuit, and the other end of R13 is grounded. The connection point between the two is connected to an input port PA4 of the control circuit as a signal detection end. At this time, if the switch detection circuit has a signal output, the control circuit determines that the load is in the open state, and the state can be recorded or displayed. In specific implementation, the open-state detection circuit can be set separately, and the presence of a signal indicates that the open-state power supply circuit is working and the load is turned on. If there is no signal, it means that the closed-state power supply circuit is working and the load is turned off.

[0025] One end of the off-state power supply circuit 1.1 is connected to the load output terminal L1 and the normally open contact of the relay 1.3 at the same time, and the other end is connected to the input end of the voltage regulator U5 through the isolation diode D4. When the relay contact is actuated and the fixed contact is connected to the normally open contact, the load is powered off and in the off state. The power supply is sequentially supplied to the control circuit through the off-state power supply circuit 1.1, the diode D4, and the output of the voltage regulator U5. The off-state detection circuit 1.11 includes series resistors R10 and R11, the other end of R10 is connected to the off-state power supply circuit, and the other end of R11 is grounded. The connection point between the two is connected to an input port PA5 of the control circuit as a signal detection end. At this time, if the off-state detection circuit has a signal output, the control circuit determines that the load is in the off state, and can record or display the state. When the electronic two-way switch receives a control instruction, the control instruction is compared with the recorded circuit status. If the instruction is the same as the circuit status, it will not act, otherwise the corresponding single-pole double-throw relay is controlled to switch once. In specific implementation, the off-state detection circuit can be set separately. If there is a signal, it means that the off-state power supply circuit is working and the load is off. No signal means that the open-state power supply circuit is working and the load is turned on.

[0026] In this embodiment, both the on-state and off-state detection circuits are provided, and the control circuit makes a more accurate judgment, effectively avoiding misjudgment caused by interference signals. In the standby state, if the normally closed end of the 1.3 relay connects the 1.2 on-state power supply circuit to the L2 output end, the 1.6 control circuit can judge whether the on-state and off-state power supply circuits are in the on state through the detection results of the 1.8 on-state detection circuit and the 1.11 off-state detection circuit; if the on-state detection circuit 1.8 detects a valid signal, it means that the on-state power supply circuit is in the on state, at this time, the 1.2 on-state power supply circuit provides power to the 1.6 control circuit, the load circuit is connected, and the load is turned on. On the contrary, if the 1.11 off-state detection circuit detects a valid signal, and the on-state detection circuit 1.8 has no valid signal, it means that the off-state power supply circuit provides power to the control circuit, and the load circuit is not connected and is in the off state. If it is determined through detection that the load circuit is in the on state, the 1.6 control circuit controls the 1.7 LED status indicator circuit to display the on state. In this state, the control circuit 1.6 continuously monitors the output signals of the on-state detection circuit 1.8 and the off-state detection circuit 1.11, thereby controlling the working state of the LED status indication circuit 1.7. The isolation diode D6 1.9 and the isolation diode D4 1.10 can isolate the on-state detection circuit and the off-state detection circuit from the power input terminal of the control circuit to avoid mutual interference.

[0027] When the normally closed end of the 1.3 relay connects the 1.2 open-state power supply circuit to the L1 output terminal, the 1.6 control circuit detects that the load circuit is connected through the 1.8 open-state detection circuit or the 1.11 closed-state detection circuit; when the 1.6 control circuit detects that someone operates the 1.5 key control signal generation circuit, the 1.6 control circuit drives the 1.3 relay through the 1.4 relay drive circuit to connect the 1.2 open-state power supply circuit to the L2 output terminal. At the same time, the 1.6 control circuit determines whether the circuit is in the closed state through the detection results of the 1.8 open-state detection circuit or the 1.11 closed-state detection circuit. If the circuit is detected to be in the closed state, the 1.6 control circuit controls the 1.7 LED status indicator circuit to turn off the display. At this time, the 1.1 closed-state power supply circuit provides power for the 1.6 control circuit. The control circuit 1.6 still continues to monitor the working status of the open-state power supply circuit and the closed-state power supply circuit.

[0028] The electronic two-way switch of the present invention can be used alone to directly replace the mechanical switch of single-point control. For example, the control signal generating circuit 1.5 is provided with a manual panel button and a wireless receiving module for remote control. The two signal generating circuits are respectively connected to the signal input end of the control circuit. The manual panel switch controls the relay contact switching. The control circuit detects the corresponding state and records and can display it. When the wireless receiving module receives the remote control signal, the control circuit will determine whether the current state is the same as the control instruction. If they are the same, no action will be taken. If they are different, the relay contact switching will be controlled.

[0029] The electronic two-way switch of the present invention can also form a system with a traditional mechanical switch or a similar electronic two-way switch, and each switch is connected in series in the load power supply circuit of the load. For example, directly replace one of the switches in the existing double-control switch. When any switch in the system is actuated and the switch state is changed, the electronic two-way switch in the system can detect the change of any switch state through the detection circuit of the on-state or off-state power supply circuit of the control circuit, and then update and display its own state, or further send the changed state to the outside. Similarly, the working conditions of other two-way switches in the two-way switch system are similar. Whenever the two-way switch is manually operated by the local panel, the corresponding single-pole double-throw relay is switched once, and the corresponding control circuit confirms the "on / off" state of the load power supply circuit through the detection circuit, records it, and can display it, and send it remotely to the remote control end. If there is another identical electronic two-way switch in the system, its control circuit also confirms the "on / off" state of the load power supply circuit through the detection circuit, records it according to the setting or hardware configuration, and can display it, and send it remotely to the remote control end. When the wireless receiving module of the electronic two-way switch receives a control instruction, the control circuit first compares the instruction with the circuit status to determine whether to control the corresponding single-pole double-throw relay to switch once and set. If the instruction and the circuit status are the same, no action will be taken; otherwise, the corresponding single-pole double-throw relay will be controlled to switch once and set.

[0030] like Figure 4 As shown in the embodiment, a traditional mechanical switch and an electronic two-way switch are connected in series to form a system. One end of the load is connected to the power supply neutral line N, and the other end is connected to the fixed end of the mechanical switch. The movable end of the mechanical switch is respectively connected to the L1 output end and the L2 output end of the electronic two-way switch. The other end of the electronic two-way switch is connected to the power supply live line L.

[0031] Since the two switches are connected in series on a line at the same time, whether the first mechanical switch is working can be judged by the on-state detection circuit or the off-state detection circuit of the second switch, and no separate signal is required. When the double-control switch A is manually operated, the switch state is switched once, and in this figure, it is switched from the output terminal connected to L1 to the output terminal connected to L2. The power supply is supplied to the load through the on-state power supply circuit 1.2 and the normally closed contact of the relay and the output of the L2 terminal, and the load is turned on. Then the control circuit 1.6 confirms the "on" state of the load power supply circuit through the effective signal of the on-state detection circuit 1.8, records it, and can display it and send it remotely to the remote control end. At the same time, the on-state power supply circuit also provides power to the control circuit 1.6, and the control circuit 1.6 enters the monitoring state. If there is another identical electronic two-way switch in the system, its control circuit also confirms the "on" state of the load power supply circuit through its own detection circuit, records it according to the setting or hardware configuration, and can display it and send it remotely to the remote control end, and enters the real-time monitoring state. When the control signal generating circuit 1.5 of the double-control switch B (electronic two-way switch) in the figure receives a control instruction, the control circuit 1.6 first compares the instruction with the circuit status to determine whether to control the corresponding single-pole double-throw relay to switch once and set. If the instruction and the circuit status are the same, no action will be taken, otherwise the corresponding single-pole double-throw relay will be controlled to switch once and set. If there are other electronic two-way switches, their working methods are similar and will not be described in detail.

[0032] The application of the electronic two-way switch and switch system described in the present invention can effectively avoid the problem that when the operator cannot intuitively understand the control status of the control switch at a certain point on the load during multi-point control of the same load in smart home control or public places such as hotels, and needs to repeatedly try operations.

[0033] The two-wire electronic two-way switch of the present invention can perfectly replace the traditional mechanical two-way switch, directly replace it without changing the wiring, and can support wireless remote control, stable operation, and strong anti-interference ability. At the same time, the electronic two-way switch can also be connected with a traditional mechanical two-way switch, a remote control two-way switch or a similar electronic two-way switch, and through the detection and judgment of the system, it can perfectly solve the connection problem of multi-point synchronous control, with a stable structure and reliable performance.

[0034] Parts not specifically introduced in the present invention may adopt common means in the prior art, such as the specific implementation methods of the on-state power supply circuit and the off-state power supply circuit, which will not be described in detail here.

[0035] The above embodiments are only preferred implementations of the present invention. In addition, the present invention may also have other implementations. In other words, any obvious minor changes and equivalent substitutions shall fall within the protection scope of the present invention without departing from the concept of the present invention.

Claims

1. An electronic two-way switch, comprising: an on-state power supply circuit, an off-state power supply circuit, a control signal generating circuit, a control circuit, a single-pole double-throw relay and a drive circuit, wherein the output end of the control circuit is connected to the drive circuit, and is used to change the position of the active end of the single-pole double-throw relay through the drive circuit connected to the relay drive coil; characterized in that: The control signal generating circuit is connected to the input end of the control circuit to start the control circuit to control the single-pole double-throw relay. The on-state power supply circuit and the off-state power supply circuit are used to supply power to the load and the control circuit, and at least one detection circuit is provided for detecting the power supply state of the on-state power supply circuit or the off-state power supply circuit, and the detection circuit is connected to the control circuit; the control circuit continuously monitors the power supply state of the load through the detection circuit; when receiving the control signal input by the control signal generating circuit, the control circuit first determines the state of the detection circuit and then issues a corresponding control instruction; One end of the off-state power supply circuit is connected to the load output end and the normally open contact of the relay at the same time, and the other end is connected to the input end of the voltage regulator through an isolation diode; when the relay contact is actuated and the fixed contact is connected to the normally open contact, the load is powered off and is in a closed state; the power supply is supplied to the control circuit through the off-state power supply circuit, the diode, and the output of the voltage regulator in turn; the off-state detection circuit includes series resistors R10 and R11, the other end of R10 is connected to the off-state power supply circuit, and the other end of R11 is grounded, and the connection point between the two is connected to an input port of the control circuit as a signal detection end.

2. The electronic two-way switch according to claim 1, characterized in that: The power supply state detection circuit of the on-state power supply circuit or the power supply state detection circuit of the off-state power supply circuit is connected to the power supply input terminal of the control circuit through a series isolation diode.

3. The electronic two-way switch according to claim 1, characterized in that: At least one of the control signal generating circuits includes a wireless receiving module for remote control.

4. The electronic two-way switch according to claim 1, characterized in that: The control signal generating circuit has at least one local manual operating device.

5. The electronic two-way switch according to claim 4, characterized in that: The local manual operation device includes a touch switch, a mechanical switch, or a micro switch.

6. The electronic two-way switch according to claim 1, characterized in that: It also includes a status indication circuit connected to the control circuit. The control circuit controls the status of the status indication circuit in real time through the signal detected by the detection circuit, and displays the connection and closing of the load power supply circuit.

7. The electronic two-way switch according to claim 6, characterized in that: The state indicating circuit includes a wireless transmitting module for transmitting the working state of the electronic two-way switch to the outside in real time.

8. A two-way switch system, comprising a plurality of two-way switches and a remote control device, wherein each two-way switch is connected in series to control the same load, characterized in that: At least one of the plurality of two-way switches is an electronic two-way switch as claimed in any one of claims 1 to 7; When any one of the two-way switches in the two-way switch system receives an operation signal, the corresponding single-pole double-throw relay is switched once and set. If there is a corresponding control circuit, the control circuit confirms the power supply state of the on-state or off-state power supply circuit through the detection circuit, and then determines the on / off state of the load power supply circuit and records it; if there is another identical electronic two-way switch in the system, its control circuit also confirms the power supply state of the on-state or off-state power supply circuit through the detection circuit, and then determines the on / off state of the load power supply circuit and records it; When any electronic two-way switch receives a control instruction, its control circuit compares the control instruction with the recorded circuit status to determine whether to control the corresponding single-pole double-throw relay to switch once and set. If the instruction is the same as the circuit status, no action will be taken. Otherwise, the corresponding single-pole double-throw relay will be controlled to switch once and set.

9. The dual-way switch system according to claim 8, characterized in that: The electronic two-way switch displays the detected on / off state of the load power supply circuit in real time through the state indicating circuit.

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