On-state power taking circuit and intelligent single-live-wire switch

Abstract

The utility model provides an on-state electricity taking circuit, which comprises a comparator circuit, a voltage sampling circuit and a main loop control switch, the input end of the voltage sampling circuit is connected with a main loop live wire for electricity taking, and the output end of the voltage sampling circuit is connected with the input end of the comparator circuit. The output end of the comparator circuit is connected with the control end of the main loop control switch; the protection circuit comprises a signal detection circuit, the input end of the signal detection circuit is connected with the output end of the comparator circuit, the signal detection circuit is used for detecting an output signal of the comparator circuit and processing and outputting the output signal, and the output end of the signal detection circuit is connected to a communication module of the single fire switch.

Description

Technical Field

[0001] The utility model relates to the field of electric power equipment, in particular to an open-state power-taking circuit and an intelligent single-fire switch. Background Art

[0002] Intelligent transformation of existing lighting scenes is a scenario where intelligent single-fire switches are applicable. Since most of the lighting switches used in previous lighting scenes control the live wire of the load separately, if users want to carry out intelligent transformation, there is no ready-made neutral wire at the original switch position. For smart switches that require neutral and live wires to draw power, they are not applicable to scenarios with only single live wires.

[0003] Existing intelligent single-fire switches generally have on-state power-drawing and off-state power-drawing circuits inside. The on-state power-drawing circuit draws and stores power when the load switch is closed, and the off-state power-drawing circuit draws and stores power when the load switch is disconnected; the stored power is supplied to the control circuit for load state control. Taking the single-fire switch that controls the lamp as an example, when the lamp is in the "on state", the mains voltage basically falls on both ends of the lamp, the on-state power-drawing circuit and the switch circuit are connected in series in the lamp circuit, the switch circuit is in the energized state, and the voltage difference between the live wire and the lamp wire is close to zero. At this time, the off-state power-drawing circuit fails, so a power-drawing circuit is realized in the lamp series circuit through the on-state power-drawing circuit to provide the necessary driving power for the switch.

[0004] However, when the open-state power-taking circuit in the single-fire intelligent switch fails (specifically, the switch NMOS tube breaks down and shorts), if the charge of the power capacitor is fully discharged, the control circuit will lose power, resulting in the load being unable to be powered off. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide an open-state power-taking circuit and an intelligent single-fire switch.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An open-state power-taking circuit comprises a comparator circuit, a voltage sampling circuit and a main circuit control switch, wherein the input end of the voltage sampling circuit is connected to the live wire of the main circuit for taking power, the output end of the voltage sampling circuit is connected to the input end of the comparator circuit, the output end of the comparator circuit is connected to the control end of the main circuit control switch, and also comprises a protection circuit;

[0008] The protection circuit includes a signal detection circuit, the input end of the signal detection circuit is connected to the output end of the comparator circuit, and is used to detect the output signal of the comparator circuit and process the output, and the output end of the signal detection circuit is connected to the communication module of the single fire switch.

[0009] Preferably, the signal detection circuit includes: a first resistor R1, a second resistor R2 and a controllable switch Q1, one end of the first resistor R1 is connected to a power supply end VCC_3V3, the second end of the first resistor R1 is connected to the second end of the controllable switch Q1, the first end of the controllable switch Q1 is grounded, the second end of the controllable switch Q1 is used to connect to a communication module of a single fire switch, the control end of the controllable switch Q1 is connected to the second end of the second resistor R2, and the first end of the second resistor R2 is connected to the output end of the comparator circuit.

[0010] Preferably, the signal detection circuit further includes: a third resistor R3, a first end of the third resistor R3 is connected to the control end of the controllable switch Q1, and a second end of the third resistor R3 is grounded.

[0011] Preferably, the protection circuit also includes a voltage stabilizing circuit, which includes a first voltage stabilizing diode ZD1 and a fourth resistor R4, the cathode of the first voltage stabilizing diode ZD1 is connected to the output end of the comparator circuit, the anode of the first voltage stabilizing diode ZD1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the control end of the main loop control switch, and is connected to the input end of the signal detection circuit.

[0012] Preferably, the voltage sampling circuit comprises: a first rectifier diode D1, a second voltage regulator diode ZD2 and an energy storage capacitor;

[0013] The positive electrode of the first rectifier diode D1 is connected to the live wire of the main circuit, the negative electrode of the first rectifier diode D1 is connected to the negative electrode of the second voltage regulator diode ZD2, the negative electrode of the second voltage regulator diode ZD2 is also connected to the energy storage capacitor, and the positive electrode of the second voltage regulator diode ZD2 is connected to the positive signal input end of the comparator circuit.

[0014] Preferably, the voltage sampling circuit also includes a second rectifier diode D2 and a delay switch circuit, the positive electrode of the second rectifier diode D2 is connected to the main circuit live wire, and the negative electrode of the second rectifier diode D2 is connected to the negative electrode of the second voltage regulator diode ZD2; the delay switch circuit includes: a fourth controllable switch Q4, a tenth resistor R10 and a fifth capacitor C5, the first end of the tenth resistor R10 is connected to the negative electrode of the first rectifier diode D1, the second end of the tenth resistor R10 is connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end and the second end of the fourth controllable switch Q4 are respectively connected to the negative electrodes of the first rectifier diode D1 and the second rectifier diode D2, and the control end of the fourth controllable switch Q4 is connected to the second end of the tenth resistor R10.

[0015] Preferably, the energy storage capacitor includes: a first capacitor C1 and a second polarity capacitor C2 connected in parallel, the first end of the first capacitor C1 is connected to the negative electrode of the first rectifier diode D1, and the other end is grounded, the positive end of the second polarity capacitor C2 is connected to the negative electrode of the first rectifier diode D1, and the negative end is grounded.

[0016] Preferably, the comparator circuit includes: a comparator U1, a feedback circuit, and a comparator input circuit.

[0017] Preferably, the comparator circuit includes: a comparator U1, a sixth resistor R6, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a fifth controllable switch Q5, a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5.

[0018] The comparator input circuit includes a seventh resistor R7, a third capacitor C3, a ninth resistor R9 and a fourth capacitor C4, the feedback circuit includes a fifth resistor R5, a sixth resistor R6, a third controllable switch Q3, and an eighth resistor R8, a forward input terminal of the comparator U1 is connected to the anode of the second voltage zener diode ZD2, one terminal of the third capacitor C3 is connected to the anode of the second voltage zener diode ZD2, and the other terminal is grounded, one terminal of the seventh resistor R7 is connected to the anode of the second voltage zener diode ZD2, and the other terminal is grounded, a second terminal of the ninth resistor R9 is connected to the reverse input terminal of the comparator U1, a first terminal of the ninth resistor R9 is connected to the power supply terminal VCC_3V3, a first terminal of the ninth resistor R9 is also connected to one terminal of the fourth capacitor, and the other terminal of the fourth capacitor is grounded;

[0019] One end of the fifth resistor R5 is connected to the output end of the comparator U1, and the other end is connected to the control end of the third controllable switch Q3. The first end of the third controllable switch Q3 is grounded, and the second end is connected in series with the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the reverse input end of the comparator U1. The utility model also provides an intelligent single-fire switch, including: an on-state power supply module, an off-state power supply module, a voltage-stabilized power supply module, a communication module, a switch driving module and a switch module. The on-state power supply module and the off-state power supply module are respectively connected to the voltage-stabilized power supply module, the voltage-stabilized power supply module is used to supply power to the single-fire switch, the switch driving module and the switch module are used to perform on and off operations on the load, and the communication module is used to control the switch module through the switch driving module, wherein the on-state power supply module includes any of the above-described on-state power supply circuits, and the output end of the signal detection circuit of the on-state power supply circuit is connected to the communication module.

[0020] In an embodiment of the utility model, the on-state power supply module 100 is provided with a protection circuit 140, which is used to detect the signal between the comparator circuit 110 and the main circuit control switch 130 of the on-state power supply module 100 and feed it back to the communication module 400 of the single fire switch, so that the communication module 400 can monitor whether the comparator circuit 110 and the main circuit control switch 130 fail and perform corresponding protection processing.

[0021] Furthermore, the first voltage zener diode ZD1 and the fourth resistor R4 are arranged in the protection circuit to limit the voltage outputted from the comparator U1 to the NMOS tube Q2 (i.e., the main circuit control switch), thereby preventing the NMOS tube Q2 from being turned on too early so that the charging voltage of the energy storage capacitor 121 cannot reach the minimum operating voltage of the comparator U1, causing the on-state power-taking circuit to operate abnormally. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the circuit function module of the utility model intelligent single fire switch;

[0023] Figure 2 It is a module function schematic diagram of the open-state power-taking circuit of the utility model;

[0024] Figure 3 It is a circuit principle diagram of the open-state power-taking circuit of the utility model;

[0025] Figure 4 It is a circuit principle diagram of another embodiment of the open-state power-taking circuit of the utility model.

[0026] The reference numerals in the figures are as follows:

[0027] On-state power taking module 100, off-state power taking module 200, voltage stabilizing power supply module 300, communication module 400, switch driving module 500 and switch module 600;

[0028] The comparator circuit 110 , the voltage sampling circuit 120 , the energy storage capacitor 121 , the main circuit control switch 130 , the protection circuit 140 , the signal detection circuit 141 , the voltage stabilizing circuit 142 , and the delay switch circuit 150 . DETAILED DESCRIPTION

[0029] The following embodiments are given in conjunction with the accompanying drawings to further illustrate the specific implementation of the open-state power-taking circuit of the present utility model. The open-state power-taking circuit of the present utility model is not limited to the description of the following embodiments.

[0030] like Figure 1The figure shows a functional module schematic diagram of the intelligent single-fire switch of this embodiment, which includes: an on-state power supply module 100, an off-state power supply module 200, a voltage-stabilized power supply module 300, a communication module 400, a switch driving module 500 and a switch module 600; wherein, the on-state power supply module 100 is used to draw power when the load is on; the off-state power supply module 200 is used to draw power when the load is off; the on-state power supply module 100 and the off-state power supply module 200 are respectively connected to the voltage-stabilized power supply module 300, and the voltage-stabilized power supply module 300 is used to stabilize the electric energy voltage obtained by the on-state power supply module 100 and the off-state power supply module 200, and is used to power the single-fire switch, for example, to power the switch driving module 500 and the communication module 400; the switch driving module 100 and the switch module 200 are used to perform on and off operations on the load; the communication module 400 is used to control the switch module 600 through the switch driving module 500. The communication module 400 generally includes a microprocessor as a main control, which can receive control commands to control the opening and closing of the single fire switch.

[0031] like Figure 2 and Figure 3 As shown, a specific embodiment of an open-state power supply module 100 provided in this embodiment is provided. The open-state power supply module 100 includes an open-state power supply circuit, which includes a comparator circuit 110, a voltage sampling circuit 120 and a main circuit control switch 130. The first end of the main circuit control switch 130 is grounded, and the second end is connected to the main circuit live wire LCOM. The input end of the voltage sampling circuit 120 is connected between the main circuit control switch 130 and the main circuit live wire LCOM, and is used to obtain energy to charge the energy storage capacitor 121 of the voltage sampling circuit 120. The output end VCC_OPEN of the voltage sampling circuit 120 outputs electric energy, and the output end of the voltage sampling circuit 120 is connected to the input end of the comparator circuit 110. The output end of the comparator circuit 110 is connected to the control end of the main circuit control switch 130, and is used to control the main circuit control switch 130. The comparator circuit 110 controls the on and off of the main circuit control switch 130 according to the voltage at the output end of the voltage sampling circuit 120.

[0032] An improvement of the present application is that the open-state power supply module 100 also includes a protection circuit 140; wherein the protection circuit 140 includes a signal detection circuit 141, the input end of the signal detection circuit 141 is connected to the output end of the comparator circuit 110, and is connected between the output end of the comparator circuit 110 and the control end of the main circuit control switch 130, for detecting the output signal of the comparator circuit 110 and processing and outputting it, and the output end of the signal detection circuit 141 is connected to the communication module of the single fire switch. In this embodiment, the main circuit control switch 130 is an NMOS tube Q2, and the output end of the comparator U1 is connected to the gate of the NMOS tube Q2. The output signal of the comparator U1 is used as a control signal to control the on / off of the main circuit control switch 130. Of course, the main circuit control switch can also use other controllable switch elements.

[0033] As a specific implementation, the signal detection circuit 141 includes: a first resistor R1, a second resistor R2 and a controllable switch Q1, one end of the first resistor R1 is connected to the power supply end VCC_3V3, the second end of the first resistor R1 is connected to the second end of the controllable switch Q1, the first end of the controllable switch Q1 is grounded, the second end of the first resistor R1 and the second end of the controllable switch Q1 are used to connect to the communication module of the single fire switch, and output the MOS_Pl use signal to the communication module of the single fire switch as the output end, the control end of the controllable switch Q1 is connected to the second end of the second resistor R2, and the first end of the second resistor R2 is connected to the output end of the comparator circuit 110. The signal detection circuit 141 also constitutes a NOT gate circuit, which can process the pulse signal input from the comparator circuit 110, and then output a MOS_P l use signal, that is, a pulse signal after shaping and NOT operation. For example, if the comparator circuit 110 inputs a high-level pulse signal, the MOS_Pl use signal output by the signal detection circuit 141 is a low-level signal. In this embodiment, the MOS_Pl use signal can match the master control IO level in the communication module 400 of the single-fire switch. When the communication module of the single-fire switch receives the MOS_P l use signal, it will perform corresponding processing according to the pre-set processing rules. For example, when the system power supply mode is open power supply and the MOS_P l use pulse signal disappears, it triggers the closing operation of the switch module, thereby powering off the load. In this embodiment, the controllable switch Q1 is an NMOS tube.

[0034] Furthermore, the signal detection circuit 141 also includes: a third resistor R3, a first end of the third resistor R3 is connected to the control end of the controllable switch Q1, and a second end of the third resistor R3 is grounded. The setting of the third resistor R3 can filter out some high-frequency interference.

[0035] As a further improvement, the protection circuit 140 also includes a voltage stabilizing circuit 142, and the voltage stabilizing circuit 142 includes a first voltage stabilizing diode ZD1 and a fourth resistor R4, the cathode of the first voltage stabilizing diode ZD1 is connected to the output end of the comparator circuit 110, the anode of the first voltage stabilizing diode ZD1 is connected to the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is connected to the control end of the main loop control switch 130, and is connected to the input end of the signal detection circuit 141, and is specifically connected to the control end of the controllable switch Q1 through the second resistor R2. The first voltage stabilizing diode ZD1 and the fourth resistor R4 work together to prevent the main loop control switch 130 from being turned on too early, so as to ensure that the energy storage capacitor of the voltage sampling circuit 120 can be charged to reach the minimum working voltage of the comparator, and to ensure the normal operation of the open-state power-taking circuit.

[0036] In this embodiment, the voltage sampling circuit 120 includes: a first rectifier diode D1, a second voltage regulator diode ZD2 and an energy storage capacitor 121; the positive electrode of the first rectifier diode D1 is connected to the main circuit live wire, the negative electrode of the first rectifier diode D1 is connected to the negative electrode of the second voltage regulator diode ZD2, the negative electrode of the second voltage regulator diode ZD2 is also connected to the energy storage capacitor 121, and the positive electrode of the second voltage regulator diode ZD2 is connected to the positive signal input terminal of the comparator circuit 110. The energy storage capacitor 121 is used to charge and store electric energy and then discharge and output electric energy VCC_OPEN.

[0037] As a further improvement, Figure 4 As shown, another embodiment of the voltage sampling circuit 120, in Figure 3On the basis of the embodiment, the voltage sampling circuit 120 further includes a second rectifier diode D2 and a time-delay switch circuit 150, wherein the positive electrode of the second rectifier diode D2 is connected to the live wire of the main circuit, and the negative electrode of the second rectifier diode D2 is connected to the negative electrode of the second voltage regulator diode ZD2; the time-delay switch circuit 150 includes: a fourth controllable switch Q4, a tenth resistor R10 and a fifth capacitor C5, wherein the first end of the tenth resistor R10 is connected to the negative electrode of the first rectifier diode D1, the second end of the tenth resistor R10 is connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end and the second end of the fourth controllable switch Q4 are respectively connected to the negative electrode of the first rectifier diode D1 and the second rectifier diode D2, and the control end of the fourth controllable switch Q4 is connected to the second end of the tenth resistor R10. The fourth controllable switch Q4 of this embodiment can be a PMOS tube or other possible switches. By setting the second rectifier diode D2 and the delay switch circuit, the source voltage of the PMOS tube Q4 is much higher than the gate voltage in the initial charging stage after the first power-on, so the fourth controllable switch Q4 is turned on. At this time, the voltage sampling circuit 120 is in the first power-taking mode state. The power-taking mode in this state is the same as Figure 3 Similarly, the open-state power-taking circuit can quickly obtain enough electricity to ensure that small-power loads can also be powered on successfully, which can effectively ensure the success rate of power-on startup of small-power loads during the open-state power-taking process. However, the charging loop impedance of the energy storage capacitor of the open-state power-taking circuit is relatively high, and the charging time is too long, which can easily cause the load to flicker abnormally in the open state, such as incandescent lamps, fluorescent lamps, etc. Then, as the fifth capacitor C5 is charged, the gate voltage of the PMOS tube Q4 rises, causing the PMOS tube Q2 to be cut off, so that the open-state power-taking circuit switches to the second power-taking mode state, which can effectively avoid the abnormal flickering of the aforementioned incandescent lamps and fluorescent lamps, but its power-taking capacity is weak. When the load power is small, the voltage of the energy storage capacitor cannot be replenished in time, and the voltage is too low, which can easily cause the load to fail to power on or restart repeatedly. This embodiment can take into account two power-supply mode states by setting a delay switch circuit 150, and the delay time, that is, the working time of the first power-supply mode state depends on the time it takes for the tenth resistor R10 to charge the fifth capacitor C5 to the gate cut-off voltage of the fourth controllable switch Q4. This time can be set by the tenth resistor R10 to the fifth capacitor C5 so as to limit the power-supply time of the on-state power-supply circuit in the fourth controllable switch Q4 state to a reasonable range, thereby avoiding abnormal flickering of loads such as incandescent lamps and fluorescent lamps.

[0038] In this embodiment, the energy storage capacitor 121 includes: a first capacitor C1 and a second polarity capacitor C2 connected in parallel, the first end of the first capacitor C1 is connected to the negative electrode of the first rectifier diode D1, and the other end is grounded, the positive end of the second polarity capacitor C2 is connected to the negative electrode of the first rectifier diode D1, and the negative end is grounded.

[0039] In this embodiment, the comparator circuit 110 includes: a comparator U1, a feedback circuit 111, and a comparator input circuit 112. The comparator input circuit 112 is respectively connected to the input terminal of the comparator U1, one end of the feedback circuit 111 is connected to the output terminal of the comparator U1, and the other end is connected to the reverse input terminal of the comparator U1. The comparator input circuit 112 receives the signal of the voltage sampling circuit 120 and outputs it to the positive input terminal of the comparator U1, and receives the power supply terminal VCC_3V3 processed as a reference voltage and outputs it to the reverse input terminal of the comparator U1.

[0040] Specifically, the comparator circuit 110 includes: a comparator U1, a sixth resistor R6, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a fifth controllable switch Q5, a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. Among them, the comparator input circuit 112 includes a seventh resistor R7, a third capacitor C3, a ninth resistor R9 and a fourth capacitor C4, the feedback circuit 111 includes: a fifth resistor R5, a sixth resistor R6, a third controllable switch Q3, and an eighth resistor R8, the forward input end of the comparator U1 is connected to the anode of the second voltage zener diode ZD2, one end of the third capacitor C3 is connected to the anode of the second voltage zener diode ZD2, and the other end is grounded, one end of the seventh resistor R7 is connected to the anode of the second voltage zener diode ZD2, and the other end is grounded, the second end of the ninth resistor R9 is connected to the reverse input end of the comparator U1, the first end of the ninth resistor R9 is connected to the power supply end VCC_3V3, the first end of the ninth resistor R9 is also connected to one end of the fourth capacitor, and the other end of the fourth capacitor is grounded. One end of the fifth resistor R5 is connected to the output end of the comparator U1, and the other end is connected to the control end of the third controllable switch Q3. The first end of the third controllable switch Q3 is grounded, and the second end is connected in series to the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the inverting input end of the comparator U1. In this embodiment, the third controllable switch Q3 can be an NPN transistor.

[0041] In this embodiment, the first voltage stabilizing diode ZD1 and the fourth resistor R4 in the protection circuit 140 can limit the voltage outputted from the comparator U1 to the NMOS tube Q2 (i.e., the main circuit switch 130); wherein, the live wire LCOM of the load main circuit in the open-state power-taking circuit is rectified by the first rectifier diode D1 to charge the energy storage capacitor 121, and when the charge reaches a preset value, the second voltage stabilizing diode ZD2 is broken down, and the current flows through the seventh resistor R7, and the voltage generated by the seventh resistor R7 is applied to the positive input terminal of the comparator U1, and the third capacitor C3 is also charged at the same time; at this time, the reverse input terminal of the comparator U1 is charged by the NPN transistor Q3 (i.e., the third controllable switch The first resistor R4 and the second resistor C3 are in the off state, and the voltage of the first resistor R4 is VCC_3V3 pulled up by the ninth resistor R9; as the voltage on the third capacitor C3 gradually rises, the input voltage of the positive input terminal of the comparator U1 is greater than the voltage of its reverse input terminal, so the output terminal of the comparator U1 outputs a high level; when the output voltage of the comparator U1 breaks through the first voltage zener diode ZD1, it will flow through the gate of the NMOS tube Q2 to turn it on and end the charging; the first voltage zener diode ZD1 and the fourth resistor R4 work together to prevent the NMOS tube Q2 from turning on too early so that the charging voltage of the energy storage capacitor 121 cannot reach the minimum operating voltage of the comparator U1, causing the open-state power-taking circuit to work abnormally.

[0042] In this embodiment, the signal detection circuit 141 (i.e., the NOT gate circuit) in the protection circuit 140 can process the pulse signal input from the direction of the fourth resistor R4, and then output the MOS_Pl use signal, that is, the pulse signal after shaping and NOT operation. For example, the input in the direction of R4 is a high-level pulse signal, and the output MOS_Pl use is a low-level pulse signal; wherein, the NOT gate circuit processes the input pulse signal in order to obtain a pulse signal that can match the IO level of the main control microprocessor in the communication module, that is, the MOS_Pl use signal; after receiving the MOS_Pl use signal, the communication module 400 in the intelligent single fire switch will process the received MOS_Pl use signal according to the pre-set processing rules, for example, when the system power supply mode is the on-state power supply and the MOS_Pl use pulse signal disappears, the closing operation of the switch module is triggered, thereby cutting off the power to the load, thereby switching to the off-state power supply mode.

[0043] Based on the above, the control end drive pulse (i.e., the gate drive pulse of the NMOS tube) of the main circuit control switch in the open-state power-taking circuit can be detected in real time; when the switch module 600 is in a closed and on state, a pulse signal with a fixed frequency and duty cycle can be detected. If the switch module 600 is in a closed and on state and the above pulse signal cannot be detected, it can be determined that the main circuit control switch (NMOS tube) or the comparator circuit part (i.e., the comparator and its connected components) in the open-state power-taking circuit has failed. Before the energy storage capacitor is discharged, the switch module 600 can be actively disconnected, and the communication module 400 drives the switch module to disconnect through the switch drive module, so that the power-taking mode is converted to the off-state power-taking mode, thereby avoiding the situation where the load cannot be powered off due to the failure of the open-state power-taking circuit in the open-state power-taking mode.

[0044] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0045] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An open-state power supply circuit, comprising a comparator circuit (110), a voltage sampling circuit (120) and a main circuit control switch (130), wherein the input end of the voltage sampling circuit (120) is connected to the live wire of the main circuit for supplying power, the output end of the voltage sampling circuit (120) is connected to the input end of the comparator circuit (110), and the output end of the comparator circuit is connected to the control end of the main circuit control switch (130), characterized in that: It also includes a protection circuit (140); the protection circuit (140) includes a signal detection circuit (141); the input end of the signal detection circuit (141) is connected to the output end of the comparator circuit (110) and is used to detect the output signal of the comparator circuit (110) and process and output it; the output end of the signal detection circuit (141) is connected to the communication module of the single ignition switch.

2. The open-state power supply circuit according to claim 1, characterized in that: The signal detection circuit (141) comprises: a first resistor R1, a second resistor R2 and a controllable switch Q1, one end of the first resistor R1 is connected to a power supply end VCC_3V3, the second end of the first resistor R1 is connected to the second end of the controllable switch Q1, the first end of the controllable switch Q1 is grounded, the second end of the controllable switch Q1 is used to connect to a communication module of a single fire switch, the control end of the controllable switch Q1 is connected to the second end of the second resistor R2, and the first end of the second resistor R2 is connected to the output end of the comparator circuit (110).

3. The open-state power supply circuit according to claim 2, characterized in that: The signal detection circuit (141) further comprises: a third resistor R3, a first end of the third resistor R3 is connected to the control end of the controllable switch Q1, and a second end of the third resistor R3 is grounded.

4. The open-state power supply circuit according to claim 1, characterized in that: The protection circuit (140) further comprises a voltage stabilizing circuit (142), wherein the voltage stabilizing circuit (142) comprises a first voltage stabilizing diode ZD1 and a fourth resistor R4, wherein a cathode of the first voltage stabilizing diode ZD1 is connected to an output end of the comparator circuit (110), an anode of the first voltage stabilizing diode ZD1 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is connected to a control end of a main loop control switch (130) and is connected to an input end of a signal detection circuit (141).

5. The open-state power supply circuit according to claim 1, characterized in that: The voltage sampling circuit (120) comprises: a first rectifier diode D1, a second voltage regulator diode ZD2 and an energy storage capacitor (121); The positive electrode of the first rectifier diode D1 is connected to the live wire of the main circuit, the negative electrode of the first rectifier diode D1 is connected to the negative electrode of the second voltage regulator diode ZD2, the negative electrode of the second voltage regulator diode ZD2 is also connected to the energy storage capacitor (121), and the positive electrode of the second voltage regulator diode ZD2 is connected to the positive signal input terminal of the comparator circuit (110).

6. The open-state power supply circuit according to claim 5, characterized in that: The voltage sampling circuit (120) further comprises a second rectifier diode D2 and a time-delay switch circuit (150), wherein the positive electrode of the second rectifier diode D2 is connected to the live wire of the main circuit, and the negative electrode of the second rectifier diode D2 is connected to the negative electrode of the second voltage-stabilizing diode ZD2; the time-delay switch circuit comprises: a fourth controllable switch Q4, a tenth resistor R10 and a fifth capacitor C5, wherein the first end of the tenth resistor R10 is connected to the negative electrode of the first rectifier diode D1, the second end of the tenth resistor R10 is connected to the first end of the fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, the first end and the second end of the fourth controllable switch Q4 are respectively connected to the negative electrodes of the first rectifier diode D1 and the second rectifier diode D2, and the control end of the fourth controllable switch Q4 is connected to the second end of the tenth resistor R10.

7. The open-state power supply circuit according to claim 5 or 6, characterized in that: The energy storage capacitor (121) comprises: a first capacitor C1 and a second polarity capacitor C2 connected in parallel, wherein a first end of the first capacitor C1 is connected to a negative electrode of the first rectifier diode D1, and the other end is grounded, and a positive terminal of the second polarity capacitor C2 is connected to a negative electrode of the first rectifier diode D1, and a negative terminal is grounded.

8. The open-state power supply circuit according to claim 5 or 6, characterized in that: The comparator circuit (110) comprises: a comparator U1, a feedback circuit (111), and a comparator input circuit (112), wherein the comparator input circuit (112) is respectively connected to the input end of the comparator U1, and one end of the feedback circuit (111) is connected to the output end of the comparator U1, and the other end is connected to the inverting input end of the comparator U1.

9. The open-state power supply circuit according to claim 8, characterized in that: The comparator circuit (110) comprises: a comparator U1, a sixth resistor R6, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, a fifth controllable switch Q5, a seventh resistor R7, an eighth resistor R8, and a fifth capacitor C5. The comparator input circuit (112) comprises a seventh resistor R7, a third capacitor C3, a ninth resistor R9 and a fourth capacitor C4; the feedback circuit (111) comprises a fifth resistor R5, a sixth resistor R6, a third controllable switch Q3 and an eighth resistor R8; a forward input terminal of the comparator U1 is connected to the anode of the second voltage zener diode ZD2; one end of the third capacitor C3 is connected to the anode of the second voltage zener diode ZD2 and the other end is grounded; one end of the seventh resistor R7 is connected to the anode of the second voltage zener diode ZD2 and the other end is grounded; a second end of the ninth resistor R9 is connected to the reverse input terminal of the comparator U1; a first end of the ninth resistor R9 is connected to the power supply terminal VCC_3V3; a first end of the ninth resistor R9 is also connected to one end of the fourth capacitor and the other end of the fourth capacitor is grounded; One end of the fifth resistor R5 is connected to the output end of the comparator U1, and the other end is connected to the control end of the third controllable switch Q3. The first end of the third controllable switch Q3 is grounded, and the second end is connected in series to the first end of the eighth resistor R8. The second end of the eighth resistor R8 is connected to the inverting input end of the comparator U1.

10. An intelligent single fire switch, characterized in that: include: An on-state power supply module (100), an off-state power supply module (200), a voltage-stabilized power supply module (300), a communication module (400), a switch drive module (500) and a switch module (600), wherein the on-state power supply module (100) and the off-state power supply module (200) are respectively connected to the voltage-stabilized power supply module (300), the voltage-stabilized power supply module (300) is used to supply power to a single-fire switch, the switch drive module (500) and the switch module (600) are used to perform on and off operations on a load, and the communication module (400) is used to control the switch module (600) through the switch drive module (500), wherein the on-state power supply module (100) comprises an on-state power supply circuit as described in any one of claims 1 to 9, and an output end of a signal detection circuit (141) of the on-state power supply circuit is connected to the communication module (400).

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