Switching circuit with power-off restart protection function and button switch

Abstract

The utility model relates to the technical field of button switches, in particular to a switch circuit with a power failure restart protection function and a button switch, which comprise a power supply circuit, a main control module, a control circuit and a button mechanism, one end of the control end of the control device is connected with the input end of the power supply circuit, the other end of the control end of the control device is connected with the output end of the power supply circuit, and after the switching circuit is powered off and restarted in a conducting state, the main control module drives the control device to be switched off. According to the utility model, when the main control module detects that the voltage of the output end a of the power supply voltage is lower than the power-down threshold voltage, the control device in the control circuit drives the control device to be disconnected, so that the load is not in a conducting state even if power is recovered; and the surge current or the over-strong starting current and voltage generated by the mains supply during power restoration can be effectively prevented from damaging the load and the terminal equipment, and the reliability is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of push button switches, in particular to a switch circuit and a push button switch with a power-off restart protection function. Background Art

[0002] At present, the push button switches on the market have the following defects: First, there is no power-off restart protection function. When the electrical appliance is turned on, the power is off or the power plug is accidentally unplugged by others. The operator is still in the process of pressing the switch button to use the appliance. Then suddenly the call comes or the power is turned on. The operator is not alert and quickly turns on the motor. The impact force when the motor starts can easily cause injury to the operator and damage to the appliance. Second, the protection function is achieved by combining thyristors with single-chip microcomputer components. However, this method has low reliability and high cost. The main reasons are: the temperature of the thyristor continues to rise when the appliance is used for a long time or overloaded, and it is easy to break down, destroy and burn, and lose the protection function; the single-chip microcomputer has many auxiliary electronic components, and the electronic components are easy to be damaged or fall off in harsh environments (extremely hot or cold), lose the protection function, and even have safety hazards. Therefore, some high-end industries do not recognize this protection solution, or even resist it.

[0003] For example, a Chinese utility model patent for a push button switch with power-off protection, with publication number CN204257430U, includes a push button switch body, in which a power-off protection module is integrated, and switch contacts and power-off protection modules are respectively connected to two-phase transmission lines, and the power-off protection modules are connected in parallel with the switch contacts through a signal spring; the signal spring detects whether there is voltage passing through the switch contacts by comparing the input and output voltages of the monitoring switch contacts, and sends a signal to the power-off protection module; if the power-off protection module receives a signal that voltage passes through the switch contacts, the power-off protection module maintains voltage transmission; if the power-off protection module receives a signal that no voltage passes through the switch contacts, the power-off protection module cuts off voltage transmission. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems, the utility model proposes a switch circuit and a button switch with power-off and restart protection function, aiming to solve the problem in the prior art that if the switch is still in the on state after power off and restart, the load or terminal equipment is easily broken down or damaged by surge current or excessive starting voltage and current shock.

[0006] (II) Technical solution

[0007] The utility model discloses a switch circuit with a power-off restart protection function, the switch circuit comprising:

[0008] A power supply circuit, the input end of which is connected to the mains power, and is used to reduce and stabilize the voltage of the mains power, and includes an output end a and an output end b;

[0009] A main control module, one end of which is connected to the output terminal a, and is used to determine whether the input voltage of the output terminal a reaches a power-off threshold;

[0010] The control circuit includes a control device, which is arranged at the input end of the power supply circuit and is used to disconnect the control device when the main control module detects power failure;

[0011] A button mechanism, one end of which is connected to the main control module and the output end b of the power supply circuit. When the button mechanism is closed, the control device is closed and the switch circuit is turned on;

[0012] The power supply end of the control circuit is connected to the output end a, one end of the control end of the control device is connected to the input end of the power supply circuit and the other end is connected to the output end of the power supply circuit. When the switch circuit is powered off and restarted in the on state, the main control module drives the control device to disconnect.

[0013] In the utility model, the switch circuit also includes an alarm device, one end of which is connected to the output end b, and the other end is connected to the main control module. The alarm device is used to warn the user when the switch circuit is powered off and restarted in the on state.

[0014] In the utility model, the alarm device is one or more combinations of a buzzer, an indicator light, and a vibrator.

[0015] In the utility model, the power supply circuit includes a rectifier circuit and a voltage stabilizer, and the input end of the power supply circuit includes a first input end, a second input end and a third input end, wherein one end of the control end of the control device is connected to the third input end, and the other end is connected to the output end of the power supply circuit.

[0016] In the present invention, the control device is one or more combinations of relays, thyristors, and switch transistors.

[0017] In the utility model, the output terminal a is connected to the detection pin of the main control module, the button mechanism is connected to the first control input pin of the main control module, the control circuit is connected to the second control input pin of the main control module, and the alarm device is connected to the control output pin of the main control module.

[0018] Another push button switch with power-off restart protection function of the utility model comprises a shell, a button mechanism for controlling the start and stop of the push button switch and a circuit board are arranged in the shell, the control circuit described in the above technical solution is integrated on the circuit board, after the push button switch is powered off and restarted, an alarm device alarms the user, and the button mechanism is closed again, and the push button switch is turned on.

[0019] (III) Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] (1) In the utility model, when the control device in the control circuit detects that the voltage at the output terminal a of the power supply voltage is lower than the power-off threshold voltage in the main control module, the driving control device is disconnected. Therefore, even if the power is restored, the load will not be in the on state, thereby effectively preventing the surge current or excessive starting current and voltage generated by the AC power when the power is restored from damaging the load and terminal equipment, and being more reliable.

[0022] (2) In the utility model, an alarm device is provided in the push button switch. When the power is restored, the alarm device continuously flashes or vibrates or emits a sound to warn the user, thereby effectively making the user pay attention and immediately turn on the equipment to be used. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the module structure of the switch circuit;

[0025] Figure 2 is a circuit principle schematic diagram of a switching circuit;

[0026] Figure 3 Schematic diagram of the internal structure of a push button switch.

[0027] 10. Housing, 20. Circuit board, 30. Relay, 40. Button mechanism, 50. Main control MCU, 100. Power supply circuit, 200. Control circuit, 300. Alarm device. DETAILED DESCRIPTION

[0028] Compared to the embodiments shown in the drawings, feasible implementations within the scope of the present disclosure may have fewer components, other components not shown in the drawings, different components, differently arranged components, or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example 1

[0031] like Figure 1-Figure 2 A switch circuit with a power-off restart protection function shown in the figure includes a main control module U1. The switch circuit is mainly used for physical switching, and is intended to prevent electronic components from being broken down or burned by surge current after power is off and restarted. The main control module U1 has six pins, and the control instructions are executed on the electrical components through the program written in the main control module U1. The six pins include a detection pin 1 for detecting the input voltage, a grounding pin 2 for grounding, a first control input pin 3 for connecting to an external control circuit, a control output pin 4 for outputting a control signal, a power supply pin 5 for connecting to a power supply, and a second control input pin 6 for connecting to an external control circuit 200.

[0032] In this embodiment, the main control module U1 adopts a control chip of model FT61 FC20-URT.

[0033] In particular, the switching circuit also includes a power supply circuit 100, an alarm device 300, a control device and a button mechanism 40 of a push button switch. The power supply circuit 100 is mainly used to connect to the AC power supply and to step down, stabilize and rectify the input current and voltage. That is, the power supply circuit 100 is provided with multiple resistors for stepping down the voltage, a rectifier and a rectifier circuit for rectifying the current, and a voltage stabilizer for adjusting the voltage.

[0034] The power supply circuit 100 includes an input terminal and an output terminal Lout, wherein the input terminal includes a first input terminal L1, a second input terminal N1 and a third input terminal N2, the first input terminal L1 is used to connect to the live wire of the mains, the second input terminal N1 and the third input terminal N2 are used to connect to the neutral wire of the mains, and the output terminal Lout is connected to an external device. That is, the switch circuit is used to manage the power consumption status of the device connected to it, that is, a switch.

[0035] Specifically, the power supply circuit 100 also has an output terminal a and an output terminal b for powering the main control module U1, the control circuit 200 and the detection pin, wherein the output terminal a outputs a 12V voltage, and the output terminal a is connected to pin 1 of the main control module U1, and the output terminal b outputs a 5V voltage, which is mainly used to power the main control module and the alarm device 300, that is, the output terminal b is connected to pin 5 of the main control module U1.

[0036] The control circuit 200 includes a controlled end, a power supply end and two control ends, wherein the controlled end is connected to the pin 6 of the main control module U1, the power supply end is connected to the output end a, and the two control ends are respectively connected to the third input end N2 and the output end Lout of the power supply circuit 100. Its main purpose is that when the main control module detects that the voltage at the output end a is lower than 9V, that is, the power-off threshold voltage, the main control module U1 drives the control circuit 200 to disconnect, that is, the output voltage of the switch circuit to the external device is 0.

[0037] Specifically, the control circuit 200 is composed of a control device, an NPN transistor Q1, a resistor R2 and a voltage regulator D1. The control device is a relay 30, and the resistor R2 is arranged at the controlled end, that is, the resistor R2 is arranged on the base of the transistor Q1. The emitter of the transistor is grounded, and the collector is connected to the relay 30. The voltage regulator is connected in parallel with the relay 30 to play the role of overvoltage protection, arc suppression and voltage stabilization in a specific circuit. The control end of the relay 30 is respectively connected to the third input end N2 and the output end Lout. When the main control module detects that the voltage at the output end a is lower than 9V, that is, the power-off threshold voltage, the main control module U1 drives the relay 30 to disconnect the circuit. Even after restarting, the external output voltage is 0, and the switch needs to be closed again to continue to conduct the circuit.

[0038] In this embodiment, the alarm device 300 is an LED indicator light. After power failure and restart, the indicator light flashes continuously to warn the user, which is more eye-catching.

[0039] Example 2

[0040] A switch circuit with a power-off restart protection function includes a main control module U1. The switch circuit is mainly used for switching, and is intended to prevent electronic components from being broken down or burned by surge current after power is off and restarted. The main control module U1 has six pins. Through the program written in the main control module U1, control instructions are executed on the electrical components. The six pins include a detection pin 1 for detecting the input voltage, a grounding pin 2 for grounding, a first control input pin 3 for connecting to an external control circuit, a control output pin 4 for outputting a control signal, a power supply pin 5 for connecting to a power supply, and a second control input pin 6 for connecting to an external control circuit 200.

[0041] In this embodiment, the main control module U1 adopts a control chip of model FT61 FC20-URT.

[0042] In particular, the switching circuit also includes a power supply circuit 100, an alarm device 300, a control device and a button mechanism 40 of a push button switch. The power supply circuit 100 is mainly used to connect to the AC power supply and to step down, stabilize and rectify the input current and voltage. That is, the power supply circuit 100 is provided with multiple resistors for stepping down the voltage, a rectifier and a rectifier circuit for rectifying the current, and a voltage stabilizer for adjusting the voltage.

[0043] The power supply circuit 100 includes an input terminal and an output terminal Lout, wherein the input terminal includes a first input terminal L1, a second input terminal N1 and a third input terminal N2, the first input terminal L1 is used to connect to the live wire of the mains, the second input terminal N1 and the third input terminal N2 are used to connect to the neutral wire of the mains, and the output terminal Lout is connected to an external device. That is, the switch circuit is used to manage the power consumption status of the device connected to it, that is, a switch.

[0044] Specifically, the power supply circuit 100 also has an output terminal a and an output terminal b for powering the main control module U1, the control circuit 200 and the detection pin, wherein the output terminal a outputs a 12V voltage, and the output terminal a is connected to pin 1 of the main control module U1, and the output terminal b outputs a 5V voltage, which is mainly used to power the main control module and the alarm device 300, that is, the output terminal b is connected to pin 5 of the main control module U1.

[0045] The control circuit 200 includes a controlled end, a power supply end and two control ends, wherein the controlled end is connected to the pin 6 of the main control module U1, the power supply end is connected to the output end a, and the two control ends are respectively connected to the third input end N2 and the output end Lout of the power supply circuit 100. Its main purpose is that when the main control module detects that the voltage at the output end a is lower than 9V, that is, the power-off threshold voltage, the main control module U1 drives the control circuit 200 to disconnect, that is, the output voltage of the control circuit 200 to the external device is 0.

[0046] Specifically, the control circuit 200 is composed of a control device, an NPN-type transistor Q1, a resistor R2 and a voltage regulator D1. The control device is a thyristor, and the resistor R2 is arranged at the controlled end, that is, the resistor R2 is arranged on the base of the transistor Q1. The emitter of the transistor is grounded, and the collector is connected to the relay 30. The voltage regulator is connected in parallel with the relay 30 to play the role of overvoltage protection, arc suppression and voltage stabilization in a specific circuit. The control end of the thyristor is respectively connected to the third input end N2 and the output end Lout. When the main control module detects that the voltage at the output end a is lower than 9V, that is, the power-off threshold voltage, the main control module U1 drives the relay 30 to disconnect the circuit. Even after restarting, the external output voltage is 0, and the switch needs to be closed again to continue to conduct the circuit.

[0047] In this embodiment, the alarm device 300 is a buzzer. When the power is turned off and then restarted, the buzzer emits a buzzing sound to alarm the user and remind him to turn on the device immediately.

[0048] Example 3

[0049] like Figure 3 As shown, the difference from Example 1 is that this embodiment discloses a push button switch with a power-off restart protection function, which mainly has a longitudinally arranged circuit board 20 and the control circuit 200 in Example 1 is integrated on the circuit board 20, namely the main control MCU50 (main control module U1), the power supply circuit 100, the control circuit 200 and the alarm device 300.

[0050] Specifically, the button switch has a housing 10 and a button mechanism 40. The circuit board 20 and the button mechanism 40 are accommodated in the housing 10. When the button mechanism 40 is closed, that is, the button is pressed down to close the circuit, the button switch is turned on, and the device connected to the button switch works normally.

[0051] When the power is off, the main control module U1 controls the relay 30 to disconnect. Even if the power is restored and restarted, the external device will not start, that is, the output voltage of the button switch is 0, thereby preventing the device from being impacted by surge current and excessive starting current and voltage, which is more reliable. At this time, the alarm device 300, that is, the indicator light keeps flashing to alarm, and the user needs to press the button switch to reset it, and press the button mechanism 40 again to close it to conduct the circuit normally.

[0052] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary personnel in the field to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents of the present invention for protection have been fully recorded in the claims.

Claims

1. A switch circuit with power-off restart protection function, characterized in that: The switch circuit comprises: A power supply circuit, the input end of which is connected to the mains power, and is used to reduce and stabilize the voltage of the mains power, and includes an output end a and an output end b; A main control module, one end of which is connected to the output terminal a, and is used to determine whether the input voltage of the output terminal a reaches a power-off threshold; The control circuit includes a control device, which is arranged at the input end of the power supply circuit and is used to disconnect the control device when the main control module detects power failure; A button mechanism, one end of which is connected to the main control module and the output end b of the power supply circuit. When the button mechanism is closed, the control device is closed and the switch circuit is turned on; The power supply end of the control circuit is connected to the output end a, one end of the control end of the control device is connected to the input end of the power supply circuit and the other end is connected to the output end of the power supply circuit. When the switch circuit is powered off and restarted in the on state, the main control module drives the control device to disconnect.

2. The switch circuit with power-off restart protection function according to claim 1, characterized in that: The switch circuit also includes an alarm device, one end of which is connected to the output terminal b, and the other end is connected to the main control module. The alarm device is used to warn users when the switch circuit is powered off and restarted in the on state.

3. The switch circuit with power-off restart protection function according to claim 2, characterized in that: The alarm device is one or more combinations of a buzzer, an indicator light, and a vibrator.

4. The switch circuit with power-off restart protection function according to claim 2 or 3, characterized in that: The power supply circuit includes a rectifier circuit and a voltage stabilizer, and the input end of the power supply circuit includes a first input end, a second input end and a third input end, wherein one end of the control end of the control device is connected to the third input end, and the other end is connected to the output end of the power supply circuit.

5. The switch circuit with power-off restart protection function according to claim 4, characterized in that: The control device is one or more combinations of relays, thyristors, and switch transistors.

6. The switch circuit with power-off restart protection function according to claim 2 or 5, characterized in that: The output terminal a is connected to the detection pin of the main control module, the button mechanism is connected to the first control input pin of the main control module, the control circuit is connected to the second control input pin of the main control module, and the alarm device is connected to the control output pin of the main control module.

7. A push button switch with power-off restart protection function, characterized in that: It comprises a shell, in which a button mechanism for controlling the start and stop of a button switch and a circuit board are arranged, the circuit board is integrated with the switch circuit described in any one of claims 1 to 6, after the button switch is powered off and restarted, an alarm device alarms the user, and the button mechanism is closed again, and the button switch is turned on.

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