WO2020211114A1

WO2020211114A1 - Flash switch control system and input flash detection circuit thereof

Info

Publication number: WO2020211114A1
Application number: PCT/CN2019/084484
Authority: WO
Inventors: 孙胜利; 魏巍; 姜兆宁; 刘达平
Original assignee: 青岛亿联客信息技术有限公司
Priority date: 2019-04-19
Filing date: 2019-04-26
Publication date: 2020-10-22

Abstract

An input flash detection circuit and a flash switch control system, the input flash detection circuit comprising a zero-crossing comparison module, an output resistor, a discharge capacitor, an isolation optocoupler and a switch detection module; an output end of the zero-crossing comparison module is connected to a first end of the output resistor and a cathode input end of the isolation optocoupler respectively; a second end of the output resistor is connected to a first end of the discharge capacitor and an anode input end of the isolation optocoupler respectively; a second end of the discharge capacitor is connected to a second input end of the zero-crossing comparison module; and an input end of the switch detection module is connected to an output end of the isolation optocoupler and is used for outputting an on-off detection signal of the isolation optocoupler; the connection of the isolation optocoupler indicates that a direct current input signal flashes off; and the connection interval time of the isolation optocoupler being greater than a signal period of an alternating current input signal indicates that the alternating current input signal flashes off. The present application effectively reduces the power consumption of a system, and increases product competitiveness and the economic benefits.

Description

A flash switch control system and its input flash detection circuit

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on April 19, 2019, the application number is 201910319585.6, and the patent title is "a flash switch control system and its input flash detection circuit". This application also Priority is required to file a Chinese patent application with the application number 2019205464392, patent titled "A flash switch control system and its input flash detection circuit" on April 19, 2019, to the Chinese Patent Office, the entire content of which is incorporated by reference Incorporated in this application.

Technical field

This application relates to the field of smart home technology, and in particular to a flash switch control system and an input flash detection circuit.

Background technique

Existing traditional switches, such as household wall switches, often only switch the switch state once after the switching action, that is, if this type of switch is touched in the on state, it will switch and remain off until the next time it is touched. Touch. As such, traditional switches will not be suitable for smart control methods in smart homes. This is because in modern smart home technology, in order to facilitate use, remote control methods such as WIFI are often used to intelligently start the electrical equipment, and the traditional switch will cut off the power supply of the entire circuit after it is turned off, making the WIFI module itself It cannot be powered on, and therefore cannot start the powered device. Therefore, it is necessary to use a flash switch with a different working mode from the traditional switch to realize modern smart home control. Unlike traditional switches, when the flash switch is touched, the power will only be cut off or the voltage will drop instantly, and then the voltage will be restored to its original state. In this way, the user touches the flash switch without cutting off the power of the electrical equipment on the line. The WIFI module can still work. When the flash switch is detected to be touched, it can start or shut down the electrical equipment through remote control commands. The flash detection circuit is a circuit used to detect whether the flash switch is in action. It can use an isolated optocoupler device to perform flash detection on the basis of isolation. However, in the flash detection circuit of the prior art, the isolated optocoupler is in the conducting state most of the time, and its conducting current is at least 1 mA, which will generate high system power consumption. In view of this, it is urgent for those skilled in the art to provide a solution to the above technical problems.

Summary of the invention

The purpose of this application is to provide a flash switch control system and its input flash detection circuit, so as to effectively reduce the power consumption of the system and improve the economic benefits of the product.

In order to solve the above technical problems, in the first aspect, this application discloses an input flicker detection circuit, including a zero-crossing comparison module, an output resistor, a discharge capacitor, an isolation photocoupler, and a switch detection module;

The first input terminal of the zero-crossing comparison module serves as the first input terminal of the input flicker detection circuit, and the second input terminal of the zero-crossing comparison module serves as the second input terminal of the input flicker detection circuit, The output terminal of the zero-crossing comparison module is respectively connected to the first terminal of the output resistor and the cathode input terminal of the isolated optocoupler; the second terminal of the output resistor is respectively connected to the first terminal of the discharge capacitor, The anode input end of the isolated optocoupler is connected; the second end of the discharge capacitor is connected to the second input end of the zero-crossing comparison module; the input end of the switch detection module is connected to the output end of the isolated optocoupler Connected, the output terminal of the switch detection module is used as the output terminal of the input flicker detection circuit for outputting the on-off detection signal of the isolation optocoupler; the zero-crossing comparison module is used for zero-crossing the input signal Detect and provide a discharge circuit for the discharge capacitor when the input signal crosses zero;

If the input signal is a DC signal, the conduction phenomenon of the isolated optocoupler indicates that the DC signal has flicker; if the input signal is an AC signal, when the conduction interval of the isolated optocoupler is longer than When the signal period of the AC signal, it indicates that the AC signal has flicker.

Optionally, the switch detection module includes a pull-up resistor and a first power supply;

The first output terminal of the isolation optocoupler is connected to the first power supply through the pull-up resistor and serves as the output terminal of the switch detection module, and the second output terminal of the isolation optocoupler is grounded.

Optionally, the switch detection module further includes a protection capacitor connected between the first output terminal and the second output terminal of the isolated optocoupler.

Optionally, it further includes an input resistance connected to the first input terminal of the zero-crossing comparison module.

Optionally, it further includes a voltage regulator tube connected between the first input terminal and the second input terminal of the zero-crossing comparison module.

Optionally, the zero-crossing comparison module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first PMOS tube, a second PMOS tube, a first NMOS tube, a second NMOS tube, and a reference voltage source , Comparator and inverter; the first terminal of the first resistor, the source of the first PMOS tube, the source of the second PMOS tube, and the first power input terminal of the reference voltage source are all Are connected to each other and serve as the first input terminal of the zero-crossing comparison module; the second terminal of the first resistor, the first terminal of the second resistor, and the drain of the first PMOS transistor are all connected to each other; The second terminal of the second resistor, the first terminal of the third resistor, and the non-inverting input terminal of the comparator are all connected to each other; the output terminal of the reference voltage source is connected to the inverting input terminal of the comparator Terminal connection; the second terminal of the third resistor, the first terminal of the fourth resistor, and the drain of the first NMOS tube are all connected to each other; the gate of the first PMOS tube, the first terminal of the first The gate of the NMOS tube, the output terminal of the comparator, and the input terminal of the inverter are all connected to each other; the output terminal of the inverter, the gate of the second PMOS tube, the second NMOS The gates of the tubes are all connected to each other; the drain of the second PMOS tube is connected to the drain of the second NMOS tube, and serves as the output terminal of the zero-crossing comparison module; the second power supply of the reference voltage source The input terminal, the second terminal of the fourth resistor, the source of the first NMOS transistor, and the source of the second NMOS transistor are all connected to each other and serve as the second input terminal of the zero-crossing comparison module.

In the second aspect, the present application discloses a flash switch control system, including a flash switch, a rectifier module, a voltage regulating module, a control module, a drive module, and any input flash detection circuit as described above;

The first end of the flash switch is used to connect to an AC power source, and the second end of the flash switch is respectively connected to the input end of the rectifier module and the input flash detection circuit; the output of the rectifier module The terminal is connected to the input terminal of the voltage regulation module and is used to rectify the alternating current to output direct current; the output terminal of the voltage regulation module is connected to the power supply terminal of the control module and is used to provide the control module with a corresponding operating voltage The power supply end of the drive module is connected to the output end of the rectification module, the output end of the drive module is connected to the electrical equipment for driving the electrical equipment; the input end of the control module is connected to the The output terminal of the input flicker detection circuit is connected, and the output terminal of the control module is connected with the input terminal of the drive module, and is used to determine the flicker according to the on-off detection signal output by the input flicker detection circuit The switching state of the switch, and controlling the electrical equipment to switch the state according to the switching state.

Optionally, it further includes a filter module, the input end of the filter module is connected to the output end of the rectification module, and the output end of the filter module is connected to the input end of the voltage regulation module.

Optionally, the rectifier module is specifically a bridge rectifier module.

Optionally, the control module and the drive module both include a wireless communication unit, and the control module is specifically configured to send a wireless control instruction for state switching to the drive module according to the switching state of the flash switch .

The input flicker detection circuit provided by this application includes a zero-crossing comparison module, an output resistor, a discharge capacitor, an isolation photocoupler, and a switch detection module; the first input terminal of the zero-crossing comparison module is used as the input flicker detection circuit The first input terminal, the second input terminal of the zero-crossing comparison module is used as the second input terminal of the input flicker detection circuit, and the output terminal of the zero-crossing comparison module is connected to the first terminal of the output resistor, The cathode input end of the isolated optocoupler is connected; the second end of the output resistor is connected to the first end of the discharge capacitor and the anode input end of the isolated optocoupler; the second end of the discharge capacitor is connected to The second input terminal of the zero-crossing comparison module is connected; the input terminal of the switch detection module is connected with the output terminal of the isolation optocoupler, and the output terminal of the switch detection module is used as the output of the input flicker detection circuit Terminal, used to output the on-off detection signal of the isolated optocoupler; the zero-crossing comparison module is used to detect the zero-crossing of the input signal, and provide a discharge circuit for the discharge capacitor when the input signal zero-crosses; If the input signal is a DC signal, the conduction phenomenon of the isolated optocoupler indicates that the DC signal has flicker; if the input signal is an AC signal, when the conduction interval of the isolated optocoupler is longer than When the signal period of the AC signal, it indicates that the AC signal has flicker.

It can be seen that, compared with the prior art, the input flicker detection circuit provided by this application uses a specific connection structure of a zero-crossing comparison module, a discharge capacitor, and an isolated optocoupler, so that the discharge capacitor is only performed when the input signal drops to the reference voltage. Discharge, and use the isolation optocoupler to detect the discharge phenomenon of the discharge capacitor, which can realize the flash detection of the DC or AC input signal according to whether the discharge phenomenon occurs or its periodic law. Since the isolated optocoupler is only in the conducting state during a short discharge, the system power consumption is greatly reduced, and the product competitiveness and economic benefits are effectively improved. The flash switch control system provided by the present application includes the above-mentioned input flash detection circuit, which also has the above-mentioned beneficial effects.

Description of the drawings

In order to more clearly explain the prior art and the technical solutions in the embodiments of the present application, the following will briefly introduce the prior art and the drawings that need to be used in the description of the embodiments of the present application. Of course, the following drawings related to the embodiments of the present application describe only a part of the embodiments of the present application. For those of ordinary skill in the art, without creative work, other examples can be obtained according to the provided drawings. The drawings and other drawings obtained also belong to the protection scope of this application.

FIG. 1 is a schematic structural diagram of an input flicker detection circuit provided by this application in a specific embodiment;

2 is a schematic structural diagram of the input flicker detection circuit provided by this application in another specific embodiment;

FIG. 3 is a circuit structure diagram of the zero-crossing comparison module provided by this application in a specific embodiment;

4 is a structural block diagram of a flash switch control system provided by this application in a specific embodiment;

FIG. 5 is a structural block diagram of the flash switch control system provided by this application in another specific embodiment.

detailed description

The core of this application is to provide a flash switch control system and its input flash detection circuit, so as to effectively reduce the power consumption of the system and improve the economic benefits of the product.

In order to describe the technical solutions in the embodiments of the present application more clearly and completely, the technical solutions in the embodiments of the present application will be introduced below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

As mentioned above, the flash switch can be a circuit switch that only causes the circuit to flash off for an instant after being touched, and then resumes. Specifically, a switching action of the flash switch will cause two switching of the circuit on and off states: when the flash switch is touched, the circuit switches from the on state to the off state, causing the voltage to drop or power off; When the flash switch is released at the end of the press, the circuit is switched to the on state to restore the voltage recovery. Alternatively, the flash switch can be equipped with an automatic timing rebound structure. After the circuit is disconnected for a preset fixed time, The circuit is automatically restored and switched to the conducting state. Since the entire process of disconnecting and conducting the circuit takes a short time, the flash switch will cause the circuit to flash once every time it is touched.

The embodiment of the application discloses an input flicker detection circuit. As shown in FIG. 1, the circuit includes a zero-crossing comparison module, an output resistance Ro, a discharge capacitor Ci, an isolation optocoupler OC, and a switch detection module;

The first input terminal of the zero-crossing comparison module serves as the first input terminal of the input flicker detection circuit, the second input terminal of the zero-crossing comparison module serves as the second input terminal of the input flicker detection circuit, and the output terminals of the zero-crossing comparison module are respectively Connected to the first end of the output resistor Ro and the cathode input end of the isolated optocoupler OC; the second end of the output resistor Ro is connected to the first end of the discharge capacitor Ci and the anode input end of the isolated optocoupler OC; The second terminal is connected with the second input terminal of the zero-crossing comparison module; the input terminal of the switch detection module is connected with the output terminal of the isolation optocoupler OC, and the output terminal of the switch detection module is used as the output terminal of the input flash detection circuit for output Isolate the on-off detection signal of the optocoupler OC; the zero-crossing comparison module is used to detect the zero-crossing of the input signal and provide a discharge circuit for the discharge capacitor Ci when the input signal crosses zero;

If the input signal Vin is a DC signal, the conduction phenomenon of the isolated optocoupler OC indicates that the DC signal has flickered; if the input signal Vin is an AC signal, when the conduction interval of the isolated optocoupler OC is longer than the signal period of the AC signal , It indicates that the AC signal has flickered.

As shown in FIG. 1, the input flicker detection circuit provided by the present application specifically uses an isolated optocoupler OC to detect the discharge process of the discharge capacitor Ci, so as to realize the detection of the input signal flicker phenomenon. Wherein, the input signal Vin can be specifically an AC signal, such as a commercial power supply, the first input terminal of the input flicker detection circuit can be connected to the live wire, and the second input terminal of the input flicker detection circuit can be connected to the neutral line; The input signal Vin can also be specifically a DC signal, and the first input terminal of the input flicker detection circuit can be connected to the positive phase terminal of the DC signal, and the second input terminal of the input flicker detection circuit can be grounded.

The zero-crossing comparison module can specifically use the built-in reference voltage source Ref and the comparator U to detect the zero-crossing of the input signal Vin, and can switch the conduction state of the internal circuit when the input signal Vin crosses zero, so as to provide the discharge capacitor Ci The discharge circuit, and then realize the flicker detection of the input signal Vin.

Specifically, if the input signal Vin input to the flicker detection circuit is an AC signal, when the voltage value of the input signal Vin is high, the discharge capacitor Ci is in a charged state. During this period, since the voltage at point B is never higher than the voltage at point A, the light-emitting device in the isolated optocoupler OC (the light-emitting diode shown in Figure 1) is not turned on, so the photosensitive switch ( The photosensitive triode shown in Figure 1 is also in the off state. When the input signal Vin decreases to a certain extent, such as zero crossing, the conduction structure of the internal circuit of the zero crossing comparison module is switched to provide a discharge circuit for the discharge capacitor Ci; at this time, since the voltage across the capacitor cannot change suddenly, the voltage at point B will Above the voltage at point A, the discharge capacitor Ci will discharge along the discharge circuit provided by the zero-crossing comparison module, making the isolated optocoupler OC conduct, and the conduction time of the isolated optocoupler OC depends on the duration of the discharge current of the discharge capacitor Ci duration. With the change of the input signal Vin, when the input signal Vin increases again, the discharge capacitor Ci resumes the charging state, and the isolated optocoupler OC is still in the off state.

From the above process analysis, it can be seen that for the AC input signal Vin, the discharge of the discharge capacitor Ci occurs only once in one AC cycle, that is, when the input signal Vin drops to a certain degree, such as zero crossing. Therefore, correspondingly, The isolated optocoupler OC is only turned on once. Therefore, in the normal state, that is, no flicker occurs, the interval between two adjacent conductions of the isolated optocoupler OC is equal to the signal period of the AC input signal Vin. Generally, the AC input signal Vin used is commercial power, and its signal period is 20 ms. However, once the input signal Vin has flickered, it will affect the continuity of the input signal Vin, and the conduction interval of the isolated optocoupler OC will inevitably be longer than the original fixed signal period. From this, it can be determined that the input signal Vin has flickered. Off.

On the other hand, if the input signal Vin of the input flicker detection circuit is a DC signal, under normal conditions, the voltage value of the input signal Vin is higher, and the voltage at point B is always not higher than the voltage at point A, so the isolated optocoupler OC is in Off state. Once the input signal Vin is flickered, the discharge capacitor Ci will undergo a short discharge process during the flicker, and the isolated optocoupler OC will also have a short conduction phenomenon. Therefore, for the DC input signal Vin, when the conduction phenomenon of the isolation optocoupler OC is detected, it can be determined that the input signal Vin has flicker.

It should also be noted that whether for AC input signals or DC input signals, in the above detection process, since the discharge process of the discharge capacitor Ci will end quickly, the conduction state of the isolated optocoupler OC is switched instantly. The isolated optocoupler OC is in the off state most of the time, and there is no conduction current, so the system power consumption is greatly reduced.

In addition, those skilled in the art can select and design the specific circuit structure of the switch detection module by themselves, as long as the conduction state of the isolation optocoupler OC can be obtained according to the on-off detection signal output by the switch detection module, which is not limited in this application.

The input flicker detection circuit provided by this application includes a zero-crossing comparison module, an output resistance Ro, a discharge capacitor Ci, an isolation photocoupler OC, and a switch detection module; the first input terminal of the zero-crossing comparison module is used as the first input of the input flicker detection circuit One input terminal, the second input terminal of the zero-crossing comparison module is used as the second input terminal of the input flicker detection circuit, and the output terminal of the zero-crossing comparison module is respectively connected with the first terminal of the output resistance Ro and the cathode input terminal of the isolated optocoupler OC Connection; the second end of the output resistor Ro is connected to the first end of the discharge capacitor Ci and the anode input end of the isolation optocoupler OC; the second end of the discharge capacitor Ci is connected to the second input end of the zero-crossing comparison module; switch detection The input end of the module is connected to the output end of the isolated optocoupler OC, and the output end of the switch detection module is used as the output end of the input flash detection circuit to output the on-off detection signal of the isolated optocoupler OC; the zero-crossing comparison module is used to compare The input signal conducts zero-crossing detection, and provides a discharge circuit for the discharge capacitor Ci when the input signal crosses zero; if the input signal is a DC signal, the conduction phenomenon of the isolated optocoupler OC indicates that the DC signal has flickered; if the input signal is AC Signal, when the conduction interval of the isolated optocoupler OC is longer than the signal period of the AC signal, it indicates that the AC signal flashes off.

It can be seen that the input flicker detection circuit provided by this application utilizes the specific connection structure of the zero-crossing comparison module, the discharge capacitor, and the isolation optocoupler, so that the discharge capacitor is discharged only when the input signal drops to the reference voltage, and the isolation optocoupler is used The discharge phenomenon of the discharge capacitor is detected, so that the flicker detection of the DC or AC input signal can be realized according to whether the discharge phenomenon occurs or its periodic law. Since the isolated optocoupler is only in the conducting state during a short discharge, the system power consumption is greatly reduced, and the product competitiveness and economic benefits are effectively improved.

Please refer to FIG. 2, which is a structural block diagram of the input flicker detection circuit provided by this application in another specific embodiment.

As shown in Figure 2, on the basis of the foregoing, as a preferred embodiment, the switch detection module in this embodiment includes a pull-up resistor Rp and a first power supply Vcc; the first output terminal of the isolated optocoupler OC passes through the upper The pull-up resistor Rp is connected to the first power supply Vcc and serves as the output terminal of the switch detection module, and the second output terminal of the isolation optocoupler OC is grounded.

Specifically, when the isolated optocoupler OC is in the off state, the output of the switch detection module shown in Figure 2 is high due to the action of the pull-up resistor Rp; when the isolated optocoupler OC is turned on, the output of the switch detection module It is low level due to the grounding effect of the isolated optocoupler OC. Since the turn-on duration of the isolated optocoupler OC is very short relative to the turn-off duration, the low level corresponding to the turn-on state is reflected in the waveform as a negative pulse.

On the basis of the above content, as shown in Figure 2, as a preferred embodiment, the switch detection module in this embodiment further includes a protection connected between the first output terminal and the second output terminal of the isolated optocoupler OC Capacitance Cs.

As a preferred embodiment, based on the above content, as shown in FIG. 2, the input flicker detection circuit in this embodiment further includes an input resistor Ri connected to the first input terminal of the zero-crossing comparison module. As for the specific resistance value of the input resistor Ri, those skilled in the art can design and implement it by themselves according to actual use conditions, which is not limited in this application.

On the basis of the above content, as shown in Figure 2, as a preferred embodiment, the input flicker detection circuit in this embodiment further includes a circuit connected between the first input terminal and the second input terminal of the zero-crossing comparison module The voltage regulator tube D.

Specifically, a voltage regulator tube D can be set to protect the comparator U. In addition, in practical applications, the comparator U and the reference voltage source Ref can be specifically selected related packaged integrated chips.

As a preferred embodiment, as shown in FIG. 2, the capacitance value of the discharge capacitor Ci is 56 nF; the resistance value of the output resistor Ro is 1.5 kΩ.

Specifically, by setting the parameters of the discharge capacitor Ci and the output resistance Ro reasonably, the discharge current and the discharge duration can be adjusted reasonably. Among them, the rapid completion of the discharge process is beneficial to improve the detection speed and accuracy.

Referring to FIG. 3, an embodiment of the present application discloses a circuit structure of a zero-crossing comparison module. The zero-crossing comparison module includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first PMOS tube P1, a second PMOS tube P2, a first NMOS tube N1, and a second NMOS tube N2 , Reference voltage source Ref, comparator U and inverter;

The first end of the first resistor R1, the source of the first PMOS transistor P1, the source of the second PMOS transistor P2, and the first power input end of the reference voltage source Ref are all connected to each other, and serve as the first of the zero-crossing comparison module. Input end; the second end of the first resistor R1, the first end of the second resistor R2, and the drain of the first PMOS transistor P1 are all connected to each other; the second end of the second resistor R2 and the first end of the third resistor R3 , The non-inverting input ends of the comparator U are connected to each other; the output end of the reference voltage source Ref is connected to the inverting input end of the comparator U; the second end of the third resistor R3, the first end of the fourth resistor R4, and the The drains of an NMOS tube N1 are all connected to each other; the gate of the first PMOS tube P1, the gate of the first NMOS tube N1, the output terminal of the comparator U, and the input terminal of the inverter are all connected to each other; The output end, the gate of the second PMOS tube P2, and the gate of the second NMOS tube N2 are all connected to each other; the drain of the second PMOS tube P2 is connected to the drain of the second NMOS tube N2, and serves as the zero-crossing comparison module Output terminal; the second power input terminal of the reference voltage source Ref, the second terminal of the fourth resistor R4, the source of the first NMOS tube N1, and the source of the second NMOS tube N2 are all connected to each other and serve as a zero-crossing comparison module The second input terminal.

Specifically, the reference voltage source Ref is used to output the reference voltage to the inverting input terminal of the comparator U, and the comparator U outputs the comparison result signal according to the voltage relationship between the positive and inverting input terminals. When the voltage of the input signal Vin of the zero-crossing comparison module is high, the comparator U outputs a high level. After the inverter is inverted, the second PMOS transistor P2 is turned on and the second NMOS transistor N2 is turned off. In the subsequent circuit The output resistance Ro and the discharging capacitor Ci are connected to the circuit through the second PMOS tube P2, and the discharging capacitor Ci is in a charged state. When the input signal Vin of the zero-crossing comparison module reverses zero-crossing, that is, when the higher voltage value is reduced to a certain threshold and zero-crossing, the output of the comparator U is inverted and becomes a low level. After being inverted by the inverter , The second PMOS tube P2 is turned off and the second NMOS tube N2 is turned on, that is, the switching changes the internal circuit conduction structure of the zero-crossing comparison module, so that the second PMOS tube P2 cooperates with the isolated optocoupler OC in the subsequent circuit as a discharge capacitor Ci forms a discharge circuit, and then turns on the isolated optocoupler OC flowing through the discharge current.

The following describes the flash switch control system provided by this application.

Please refer to Figure 4. Figure 4 is a structural block diagram of the flash switch control system provided by this embodiment in a specific implementation, including flash switch 1, rectifier module 2, voltage regulating module 3, control module 4, and drive module 5 and any input flicker detection circuit 6 as described above;

The first end of the flash switch 1 is used to connect to the AC power source, the second end of the flash switch 1 is connected to the input end of the rectifier module 2 and the input flash detection circuit 6 respectively; the output end of the rectifier module 2 is connected to the voltage regulating module The input end of 3 is connected to rectify the alternating current to output direct current; the output end of the voltage regulating module 3 is connected to the power supply end of the control module 4 to provide the corresponding operating voltage for the control module 4; the power supply end of the drive module 5 is connected to the rectifier The output end of the module 2 is connected, the output end of the drive module 5 is connected to the electrical equipment, and is used to drive the electrical equipment; the input end of the control module 4 is connected to the output end of the input flash detection circuit 6, and the output end of the control module 4 It is connected to the input end of the driving module 5 and is used to determine the switching state of the flash switch 1 according to the on-off detection signal output by the input flash detection circuit 6, and control the electrical equipment to switch the state according to the switching state.

Specifically, the AC power supply usually uses mains power, and the flash switch 1 is connected to the mains power by connecting with the live wire. The alternating current from the mains is rectified and regulated sequentially, and then used to supply the control module 4 and the drive module 5 to work. Among them, the control module 4 is used to receive the on-off detection signal of the isolated optocoupler OC output by the input flicker detection circuit 6, so as to judge the action of the flash switch 1 according to the conduction of the isolated optocoupler OC, and then to The device performs state switching control. Since the flash switch 1 only flashes during its action and does not continuously cut off the power supply, the subsequent circuits such as the control module 4 can still supply power and work normally.

Since the commercial power is an alternating current with a frequency of 50 Hz, at this time, the control module 4 can specifically determine that the input signal to the flicker detection circuit 6 is caused by the flicker switch 1 when the conduction interval of the isolated optocoupler OC is longer than 20 ms. Flashing occurs due to the action, thereby controlling the electrical equipment such as smart lights to switch the state, for example, the electrical equipment can be switched from the on state to the off state, or from the off state to the on state, or by Switch from high power state to low power state, etc. Among them, the control module 4 may specifically control the electrical equipment to perform state switching by sending corresponding instructions to the driving module 4.

The flash switch control system provided by this application specifically adopts the input flash detection circuit described above, and uses a specific connection structure of a comparator, a discharge capacitor, and an isolated optocoupler, so that the discharge capacitor only occurs when the input signal drops to the reference voltage. Discharge, and use the isolated optocoupler to detect the discharge phenomenon of the discharge capacitor, so that the periodic law of the discharge phenomenon can be used to detect whether the flash switch is operating, and then the electrical equipment is controlled based on the switching state of the flash switch. Since the isolated optocoupler is only in the conducting state during a short discharge, the system power consumption is greatly reduced, and the product competitiveness and economic benefits are effectively improved.

Please refer to FIG. 5, which is a structural block diagram of the flash switch control system provided by this application in another specific embodiment.

As shown in Figure 5, based on the above content, as a preferred embodiment, the flash switch control system provided in this embodiment further includes a filter module 7, and the input end of the filter module 7 is connected to the output end of the rectifier module 2. , The output terminal of the filter module 7 is connected to the input terminal of the voltage regulation module 3.

Specifically, in order to further improve the quality of the direct current power supply, a filter module 7 can also be provided to filter the direct current output from the rectifier module 2.

Among them, on the basis of the above content, as a preferred embodiment, the rectifier module 2 is specifically a bridge rectifier module. Of course, those skilled in the art can also choose other types of rectifier circuit structures according to actual usage conditions.

Based on the above content, as a preferred embodiment, both the control module 4 and the drive module 5 include a wireless communication unit, and the control module 4 is specifically configured to send a wireless control of state switching to the drive module according to the switching state of the flash switch 1. instruction.

Specifically, as described above, in a smart home application scenario, the control module 4 may also specifically perform wireless communication with a matching smart electrical device through a wireless communication unit, so as to complete the state switching control of the electrical device. Wherein, the wireless communication unit may specifically include but is not limited to a WIFI communication unit or a Bluetooth communication unit.

The specific implementation of the flash switch control system provided by the present application and the input flash detection circuit described above can be referred to each other, which will not be repeated here.

The various embodiments in this application are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

It should also be noted that in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and are not necessarily required Or it implies that there is any such actual relationship or sequence between these entities or operations. In addition, the terms "including", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, circuit, article, or device that includes a series of elements includes not only those elements, but also those that are not explicitly listed Other elements of, or also include elements inherent to such processes, circuits, objects or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, circuit, article, or equipment including the element.

The technical solutions provided by this application are described in detail above. Specific examples are used in this article to describe the principles and implementations of the present application. The description of the above embodiments is only used to help understand the circuit and core ideas of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of this application, several improvements and modifications can be made to this application, and these improvements and modifications also fall within the protection scope of this application.

Claims

An input flicker detection circuit, which is characterized by comprising a zero-crossing comparison module, an output resistance, a discharge capacitor, an isolation photocoupler, and a switch detection module;

The first input terminal of the zero-crossing comparison module serves as the first input terminal of the input flicker detection circuit, and the second input terminal of the zero-crossing comparison module serves as the second input terminal of the input flicker detection circuit, The output terminal of the zero-crossing comparison module is respectively connected to the first terminal of the output resistor and the cathode input terminal of the isolated optocoupler; the second terminal of the output resistor is respectively connected to the first terminal of the discharge capacitor, The anode input end of the isolated optocoupler is connected; the second end of the discharge capacitor is connected to the second input end of the zero-crossing comparison module; the input end of the switch detection module is connected to the output end of the isolated optocoupler Connected, the output terminal of the switch detection module is used as the output terminal of the input flicker detection circuit for outputting the on-off detection signal of the isolation optocoupler; the zero-crossing comparison module is used for zero-crossing the input signal Detect and provide a discharge circuit for the discharge capacitor when the input signal crosses zero;

If the input signal is a DC signal, the conduction phenomenon of the isolated optocoupler indicates that the DC signal has flicker; if the input signal is an AC signal, when the conduction interval of the isolated optocoupler is longer than When the signal period of the AC signal, it indicates that the AC signal has flicker.
The input flicker detection circuit according to claim 1, wherein the switch detection module comprises a pull-up resistor and a first power supply;

The first output terminal of the isolation optocoupler is connected to the first power supply through the pull-up resistor and serves as the output terminal of the switch detection module, and the second output terminal of the isolation optocoupler is grounded.
The input flicker detection circuit according to claim 2, wherein the switch detection module further comprises a protection capacitor connected between the first output terminal and the second output terminal of the isolated optocoupler.
4. The input flicker detection circuit according to claim 3, further comprising an input resistor connected to the first input terminal of the zero-crossing comparison module.
The input flicker detection circuit according to claim 4, further comprising a voltage regulator tube connected between the first input terminal and the second input terminal of the zero-crossing comparison module.
The input flicker detection circuit according to any one of claims 1 to 5, wherein the zero-crossing comparison module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first PMOS tube, The second PMOS tube, the first NMOS tube, the second NMOS tube, the reference voltage source, the comparator and the inverter;

The first end of the first resistor, the source of the first PMOS transistor, the source of the second PMOS transistor, and the first power input end of the reference voltage source are all connected to each other and serve as the overpass The first input terminal of the zero comparison module; the second terminal of the first resistor, the first terminal of the second resistor, and the drain of the first PMOS transistor are all connected to each other; the second terminal of the second resistor Terminal, the first terminal of the third resistor, and the non-inverting input terminal of the comparator are all connected to each other; the output terminal of the reference voltage source is connected to the inverting input terminal of the comparator; the third resistor The second end of the fourth resistor, the first end of the fourth resistor, and the drain of the first NMOS tube are all connected to each other; the gate of the first PMOS tube, the gate of the first NMOS tube, the The output terminal of the comparator and the input terminal of the inverter are all connected to each other; the output terminal of the inverter, the gate of the second PMOS transistor, and the gate of the second NMOS transistor are all connected to each other; The drain of the second PMOS tube is connected to the drain of the second NMOS tube and serves as the output terminal of the zero-crossing comparison module; the second power input terminal of the reference voltage source and the fourth resistor The second end of, the source of the first NMOS transistor, and the source of the second NMOS transistor are all connected to each other and serve as the second input end of the zero-crossing comparison module.
A flash switch control system, which is characterized by comprising a flash switch, a rectifier module, a voltage regulating module, a control module, a drive module, and the input flash detection circuit according to any one of claims 1 to 6;

The first end of the flash switch is used to connect to an AC power source, and the second end of the flash switch is respectively connected to the input end of the rectifier module and the input flash detection circuit; the output of the rectifier module The terminal is connected to the input terminal of the voltage regulation module and is used to rectify the alternating current to output direct current; the output terminal of the voltage regulation module is connected to the power supply terminal of the control module and is used to provide the control module with a corresponding operating voltage The power supply end of the drive module is connected to the output end of the rectification module, the output end of the drive module is connected to the electrical equipment for driving the electrical equipment; the input end of the control module is connected to the The output terminal of the input flicker detection circuit is connected, and the output terminal of the control module is connected with the input terminal of the drive module, and is used to determine the flicker according to the on-off detection signal output by the input flicker detection circuit The switching state of the switch, and controlling the electrical equipment to switch the state according to the switching state.
The flash switch control system according to claim 7, further comprising a filter module, the input end of the filter module is connected to the output end of the rectification module, and the output end of the filter module is connected to the adjustment module. The input terminal of the voltage module is connected.
The flash switch control system according to claim 8, wherein the rectifier module is specifically a bridge rectifier module.
The flash switch control system according to any one of claims 7 to 9, wherein the control module and the drive module both comprise a wireless communication unit, and the control module is specifically configured to respond to the flash switch In the switching state, a wireless control instruction for state switching is sent to the drive module.