Power failure alarm circuit with protection, chip, equipment and switch

Abstract

The utility model discloses a power failure alarm circuit with protection, a chip, equipment and a switch, and the circuit comprises a first-stage protection circuit, a second-stage protection circuit, a third-stage protection circuit, an energy storage circuit, an alarm information circuit and an output circuit. The alarm information circuit generates a power-down alarm signal and outputs the power-down alarm signal to the output circuit, and the output circuit outputs the power-down alarm signal. On one hand, when it is identified that the industrial Ethernet switch is in the power failure state, the power failure warning signal is generated through the warning information circuit and transmitted to the output circuit so as to achieve transmission of the power failure warning signal, and therefore warning information can be rapidly and accurately sent out when the power supply is in the power failure state. And on the other hand, through the arrangement of the multi-stage protection circuit, multi-stage power supply protection is provided under the condition of the EMC test items of the industrial Ethernet switch power supply, so that the test stability of the EMC test items is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, and particularly relates to a power-off warning circuit with protection, a chip, a device and a switch. Background Art

[0002] In a modern industrial environment, an industrial Ethernet switch is an important part of network communication and is widely used in various scenarios such as automation control and data transmission. Since industrial equipment is often in a complex electromagnetic environment, industrial Ethernet switches need to pass a large number of electromagnetic compatibility (EMC) tests to ensure their reliable operation under different electromagnetic interference conditions. In these tests, the EMC protection of the power supply is particularly crucial. Especially in the application scenario of a DC power supply, the stability and anti-interference ability of the power supply directly affect the normal operation of the device.

[0003] In related technologies, most industrial Ethernet switches are usually configured with two power supplies. When the two power supplies supply power simultaneously, if one of them loses power, the other power supply can continue to provide stable power supply for the device, which enables the switch to quickly and accurately send out a power-off warning message to ensure the normal operation and timely maintenance of the system. However, in some special cases, such as when both power supplies lose power simultaneously or only one power supply is powered and this power supply loses power, due to the excessive power consumption of the switch device itself, the stored power on the circuit board will be quickly exhausted after the power-off. At this time, the device may not be able to send out a power-off warning message in time, resulting in the monitoring and maintenance system being unable to respond in time, which brings potential risks to the safe operation and fault handling of the device.

[0004] Therefore, how to ensure timely power-off warning and test safety in high-power industrial Ethernet switches, especially in the case of simultaneous power-off of two power supplies or single power supply power-off, has become an important technical problem in the current design of industrial Ethernet switches. Solving the above problems is of great significance for improving the stability and reliability of device operation. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a power-off warning circuit with protection, a chip, a device and a switch, so as to at least solve the technical problem of being unable to send out a power-off warning message in time mentioned in the related technologies.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] In the first aspect of the present utility model, a power-off warning circuit with protection is provided, which is applied to an industrial Ethernet switch. The power-off warning circuit includes a first-level protection circuit, a second-level protection circuit, a third-level protection circuit, an energy storage circuit, a warning information circuit and an output circuit. The input end of the first-level protection circuit is used for electrically connecting to a voltage input end. The output end of the first-level protection circuit is electrically connected to the input end of the second-level protection circuit. The output end of the second-level protection circuit is simultaneously electrically connected to the input end of the energy storage circuit and the input end of the warning information circuit. The output end of the warning information circuit is electrically connected to the output circuit. The output end of the energy storage circuit is electrically connected to the output circuit through the energy storage circuit. Wherein, when the industrial Ethernet switch is in a power-off state, the warning information circuit is used to generate a power-off warning signal and output it to the output circuit, and the output circuit is used to output the power-off warning signal.

[0008] In the second aspect of the present utility model, an integrated chip is provided, which includes an integrated chip body and the power-off warning circuit as described in the first aspect. The power-off warning circuit is integrated in the integrated chip body through encapsulation.

[0009] In the third aspect of the present utility model, a power-off warning device is provided, which includes a housing and the power-off warning circuit as described in the first aspect. The power-off warning circuit is built in the housing.

[0010] In the fourth aspect of the present utility model, an industrial Ethernet switch is provided, which includes a switch body and the power-off warning circuit as described in the first aspect. The power-off warning circuit is built in the switch body.

[0011] The power-off warning circuit, chip, device and switch with protection of the present utility model include a first-stage protection circuit, a second-stage protection circuit, a third-stage protection circuit, an energy storage circuit, a warning information circuit and an output circuit. The input end of the first-stage protection circuit is used for electrically connecting with a voltage input end. The output end of the first-stage protection circuit is electrically connected with the input end of the second-stage protection circuit. The output end of the second-stage protection circuit is simultaneously electrically connected with the input end of the energy storage circuit and the input end of the warning information circuit. The output end of the warning information circuit is electrically connected with the output circuit. The output end of the energy storage circuit is electrically connected with the output circuit through the energy storage circuit. Wherein, when the industrial Ethernet switch is in a power-off state, the warning information circuit is used for generating a power-off warning signal and outputting it to the output circuit, and the output circuit is used for outputting the power-off warning signal. On the one hand, through the setting of the warning information circuit, when it is recognized that the industrial Ethernet switch is in a power-off state, the warning information circuit can generate a power-off warning signal and transmit it to the output circuit to realize the transmission of the power-off warning signal, so as to quickly and accurately send out a warning message when the power is off. On the other hand, through the setting of the first-stage protection circuit, the second-stage protection circuit, the third-stage protection circuit and the energy storage circuit, multi-stage power protection is provided in the case of the EMC test items of the industrial Ethernet switch power supply, thereby improving the test stability of various EMC test items of the industrial Ethernet switch power supply. Description of the Drawings

[0012] Figure 1 is a schematic block diagram of the power-off warning circuit with protection of the present utility model;

[0013] Figure 2 is a schematic diagram of the first part of the circuit connection of the power-off warning circuit with protection of the present utility model;

[0014] Figure 3 is a schematic diagram of the second part of the circuit connection of the power-off warning circuit with protection of the present utility model;

[0015] Reference numerals: power-off warning circuit 1, first-stage protection circuit 10, second-stage protection circuit 20, third-stage protection circuit 50, energy storage circuit 40, warning information circuit 30, output circuit 60, first varistor VE1, second varistor VR2, third varistor VR3, gas discharge device G1, first inductor coil L1, second inductor coil L2 and first capacitor C1, common mode inductor L3, first zener diode TV1, second zener diode TV2, three-terminal voltage regulator D3, optocoupler U2, first resistor R1, second resistor R2, third resistor R3, fifth resistor R5, sixth resistor R6, power control module U113, seventh resistor R7, eighth resistor R8, ninth resistor R9, sixth capacitor C6, fifth capacitor C5. Detailed Embodiments

[0016] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying 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 the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0017] It should be noted that relevant terms such as "first", "second", etc. can be used to describe various components, but these terms do not limit the components. These terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component can be called the second component, and similarly, the second component can also be called the first component. The term "and / or" refers to any combination of one or more of the related items and the described items.

[0018] Please refer to Figure 1 and Figure 2 , this embodiment provides a power-off warning circuit with protection. The power-off warning circuit with protection 1 includes a first-stage protection circuit 10, a second-stage protection circuit 20, a third-stage protection circuit 50, an energy storage circuit 40, a warning information circuit 30, and an output circuit 60.

[0019] Specifically, the input end of the first-stage protection circuit 10 is used to be electrically connected to the voltage input ends (VIN1+, VIN1-), the output end of the first-stage protection circuit 10 is electrically connected to the input end of the second-stage protection circuit 20, the output end of the second-stage protection circuit 20 is simultaneously electrically connected to the input end of the energy storage circuit 40 and the input end of the warning information circuit 30, the output end of the warning information circuit 30 is electrically connected to the output circuit 60, and the output end of the energy storage circuit 40 is electrically connected to the output circuit 60 through the energy storage circuit 40.

[0020] Among them, when the industrial Ethernet switch is in a power-off state, that is, when both power supplies are powered off simultaneously or one power supply powers off while the other power supply is powered on, the warning information circuit 30 can identify that the sampled voltage is lower than a preset voltage threshold through voltage sampling, thereby generating a power-off warning signal and outputting it to the output circuit 60, and the output circuit 60 is used to output the power-off warning signal.

[0021] In the above embodiments, the power-off alarm circuit realizes the alarm function in the power-off state through a multi-stage protection circuit, an energy storage circuit, and an alarm information circuit. First, the first-stage protection circuit is mainly used to protect the power-off alarm circuit from the influence of voltage fluctuations or mutations at the input end, so as to prevent overvoltage or other power supply abnormalities from damaging the circuit. The first-stage protection circuit is electrically connected to the input voltage terminal. After ensuring the stability of the input signal, it outputs to the second-stage protection circuit. The second-stage protection circuit further strengthens the voltage protection of the circuit. It not only protects the circuit from deeper voltage fluctuations or short circuits, but also provides the necessary voltage stability. At this time, the output signal of the second-stage protection circuit is simultaneously transmitted to the energy storage circuit, the alarm information circuit, and the third-stage protection circuit. The function of the energy storage circuit is to provide a short-term power supply at the moment of power-off, ensuring that the alarm information circuit and other key parts can work normally to maintain the output of the power-off alarm signal. The alarm information circuit is the core part of the power-off alarm. When the power supply is cut off, the alarm information circuit detects the power-off state and generates a corresponding power-off alarm signal. This signal is transmitted to the external system or device through the output circuit to notify relevant personnel or devices to perform corresponding processing. In addition, the third-stage protection circuit provides the final protection layer to ensure that the alarm circuit will not output incorrect signals or lose the alarm signal due to power-off or other interference factors. The multi-level protection and energy storage mechanism of this circuit design ensure that even in the case of power-off, the alarm information can be output in a timely and accurate manner, preventing greater losses caused by equipment failures triggered by power-off.

[0022] Thus, through the protected power-off alarm circuit of this embodiment, on the one hand, when the power-off state of the industrial Ethernet switch is recognized, the power-off alarm signal can be generated by the alarm information circuit 30 and transmitted to the output circuit to realize the transmission of the power-off alarm signal, so as to quickly and accurately send out the alarm information when the power supply is cut off, avoiding the phenomenon that the power stored on the circuit board is quickly consumed after the power-off due to the high power consumption of the switch device, resulting in the device not having time to send out the power-off alarm information. On the other hand, through the settings of the first-stage protection circuit 10, the second-stage protection circuit 20, the third-stage protection circuit 50, and the energy storage circuit 40, multi-stage power protection is provided in the case of the EMC test items of the industrial Ethernet switch power supply, thereby improving the test stability of various EMC test items of the industrial Ethernet switch power supply.

[0023] Please continue to refer to Figure 2 , Figure 2 which shows the relevant circuit connection relationships of the first-stage protection circuit 10, the second-stage protection circuit 20, the third-stage protection circuit 50, the energy storage circuit 40, and the output circuit 60 in the protected power-off alarm circuit.

[0024] In some alternative embodiments of the present embodiment, the first-stage protection circuit 10 includes a first varistor VR1, a second varistor VR2, a third varistor VR3, a gas discharge device G1, and a filter circuit. One end of the first varistor VR1 is electrically connected to the positive electrode VIN+ of the voltage input terminal, one end of the second varistor VR2, and the first input terminal of the filter circuit at the same time. The other end of the first varistor VR1 is electrically connected to one end of the gas discharge device G1 and one end of the third varistor VR3 at the same time. The other end of the third varistor VR3 is electrically connected to the other end of the second varistor VR2, the second input terminal of the filter circuit, and the negative electrode VIN- of the voltage input terminal at the same time. The other end of the gas discharge device G1 is grounded, and the output terminal of the filter circuit is electrically connected to the input terminal of the second-stage protection circuit. Specifically, for the first-stage protection circuit formed by the above-mentioned various electronic components, during implementation, the combined circuit of the three varistors and the gas discharge tube at the front end can provide good protection against power supply lightning surges and insulation withstand voltage in the EMC test items, and the filter circuit can filter the input power supply and suppress the surge current at the moment of power-on.

[0025] In some alternative embodiments of the present embodiment, the filter circuit includes a first inductor coil L1, a second inductor coil L2, and a first capacitor C1. One end of the first inductor coil L1 is electrically connected to one end of the first varistor VR1, the positive electrode VIN+ of the voltage input terminal, and one end of the second varistor VR2 at the same time. The other end of the first inductor coil L1 is electrically connected to one end of the first capacitor C1 and the second-stage protection circuit at the same time. One end of the second inductor coil L2 is electrically connected to the other end of the third varistor VR3, the other end of the second varistor VR2, and the negative electrode VIN- of the voltage input terminal at the same time. The other end of the second inductor coil L2 is electrically connected to the other end of the first capacitor C1 and the second-stage protection circuit at the same time. Specifically, the filter circuit formed by the above-mentioned various electronic components is a π-type filter circuit, which can filter the input power supply to suppress high-frequency interference signals and voltage spikes in the power supply, thereby ensuring the stability of power supply, and is particularly suitable for power protection and stability maintenance during the test of industrial Ethernet switches.

[0026] In some alternative embodiments of the present embodiment, the second-stage protection circuit includes a common-mode inductor L3 and a first Zener diode TV1. One end of the first Zener diode TV1 is electrically connected to the first input terminal of the common-mode inductor L3 ( Figure 2 the input terminal 1 marked on the common-mode inductor L3 in the figure), the other end of the first inductor coil L1, and one end of the first capacitor C1 at the same time. The other end of the first Zener diode TV1 is electrically connected to the second input terminal of the common-mode inductor L3 ( Figure 2The input terminal marked on the common-mode inductor L3), the other end of the second inductor coil L2, and the other end of the first capacitor C1 are electrically connected. Specifically, the second-stage protection circuit composed of the above electronic components has the following functions: First, the function of the common-mode inductor L3 is to suppress common-mode noise. Common-mode noise usually refers to electromagnetic interference that symmetrically appears at both ends of the power line. L3 can eliminate or greatly reduce such interference signals through the mutual inductance of the coils at both ends. The design of the common-mode inductor ensures that when the power supply enters this protection circuit, it can effectively filter out common-mode noise and maintain the cleanliness of the voltage signal. Second, the first Zener diode TV1, as a voltage-regulating component, its main function is to prevent the power supply voltage from exceeding a predetermined value. TV1 can quickly respond to overvoltage conditions and discharge the excessive voltage to the ground, thereby preventing the surge voltage from damaging the subsequent circuit. In this embodiment, the surge from L-N (line to neutral) can be well protected, and the circuit is protected from the damage of the surge voltage.

[0027] In some alternative embodiments of this embodiment, the power-off alarm circuit further includes an anti-reverse connection circuit composed of a first diode D1 and a second diode D2, which is electrically connected between the second-stage protection circuit and the energy storage circuit. Specifically, the anti-reverse connection circuit ensures that even when the positive and negative poles of the power supply are reversed, the circuit can still operate safely and will not be damaged due to the reverse connection of the power supply to the circuit or equipment. When the positive and negative poles are reversed, the conduction states of the first diode D1 and the second diode D2 can ensure that the reverse connection voltage will not be conducted to the core part of the circuit, thereby effectively protecting the circuit from the influence of the reverse connection current.

[0028] In some alternative embodiments of this embodiment, the energy storage circuit includes a second capacitor C2 and a third capacitor C3. One end of the second capacitor C2 is simultaneously connected to one end of the third capacitor C3, the third-stage protection circuit, the alarm information circuit, and the first output terminal of the common-mode inductor L3 ( Figure 2 the output terminal 3) marked on the common-mode inductor L3 in the text) is electrically connected. The other end of the second capacitor C2 is simultaneously connected to the third-stage protection circuit, the second output terminal of the common-mode inductor L3 ( Figure 2 the output terminal 4) marked on the common-mode inductor L3 in the text), and the other end of the third capacitor C3 is electrically connected. Specifically, through the energy storage circuit composed of the above second capacitor C2 and third capacitor C3, during implementation, based on the fact that the second capacitor C2 and the third capacitor C3 are two large-capacity capacitors that can be used for energy storage, they can supply power to the device for a short period of time after the power supply is cut off, and also have the function of absorbing the surges that are not filtered by the front-end protection.

[0029] In some alternative embodiments of the present embodiment, the third-level protection circuit includes a second Zener diode TV2, which generally consists of two diodes connected in reverse series and functions as a voltage regulator. The core of the third-level protection circuit is the second Zener diode TV2. The design of the third-level protection circuit further enhances the overall stability of the power-off alarm circuit, ensuring that the circuit can operate normally under various power fluctuations and preventing damage. At the same time, this design of the third-level protection circuit provides the last protection barrier for the entire power-off alarm circuit. In the case of voltage fluctuations or sudden anomalies that cannot be completely eliminated by other protection circuits, TV2 can ensure voltage stability, protect key components from overvoltage damage, and ensure that the alarm signal can be accurately generated and transmitted in the event of a power-off.

[0030] Please refer to Figure 3 , Figure 3 which shows the circuit connection relationship of the alarm information circuit. The alarm information circuit includes a voltage sampling circuit, a three-terminal voltage regulator D3, and an optocoupler U2. The alarm information circuit includes a voltage sampling circuit and an optocoupler U2. The input end of the voltage sampling circuit is electrically connected to the output end of the second-level protection circuit, the input end of the energy storage circuit, and the input end of the third-level protection circuit at the same time. The output end of the voltage sampling circuit is electrically connected to the input end of the optocoupler through a three-terminal voltage regulator. The output end of the optocoupler is electrically connected to the output circuit. Among them, when the industrial Ethernet switch is in a power-off state, the sampling voltage collected by the voltage sampling circuit is lower than the preset voltage threshold, the three-terminal voltage regulator conducts, and the optocoupler generates a power-off alarm signal and outputs it to the output circuit.

[0031] In some alternative embodiments of the present embodiment, the voltage sampling circuit includes a first resistor R1, a second resistor R2, and a third resistor R3. One end of the first resistor R1 serves as the input end of the voltage sampling circuit. The other end of the first resistor R1 is connected to one end of the third resistor R3 and the reference pole of the three-terminal voltage regulator D3 through the second resistor R2. The anode of the three-terminal voltage regulator D3 is grounded. The cathode of the three-terminal voltage regulator D3 is electrically connected to the second input end of the optocoupler U2 ( Figure 3 the input end 2 marked on the optocoupler U2), the other end of the third resistor R3 is grounded, and the first input end of the optocoupler U2 ( Figure 3 the input end 1 marked on the optocoupler U2) can also serve as the input end of the voltage sampling circuit. The first output end of the optocoupler U2 ( Figure 3 the output end 3 marked on the optocoupler U2) is electrically connected to a supply voltage of 12V, and the second output end of the optocoupler U2 ( Figure 3The output terminal 4) marked on the opto-coupler U2 is electrically connected to the power supply circuit. Specifically, when the industrial Ethernet switch is in a power-off state, the voltage sampling circuit composed of the first resistor R1, the second resistor R2, and the third resistor R3 collects the voltage. When the sampled voltage collected is lower than the preset voltage threshold, the three-terminal voltage regulator conducts, and the opto-coupler generates a power-off alarm signal and outputs it to the output circuit.

[0032] It should be noted that when the voltage sampling circuit and the opto-coupler in the alarm information circuit are implemented, the sampled voltage obtained through the voltage sampling circuit is compared with the reference voltage (preset voltage threshold) of the three-terminal voltage regulator D3 to determine whether to trigger the subsequent opto-coupler circuit, thereby outputting different signal levels. This process is used to detect the voltage state and generate the corresponding power-off alarm signal to ensure the normal operation of the device under specific voltage conditions or to provide a warning. First, the sampled voltage is compared with the reference voltage in the three-terminal voltage regulator D3. This reference voltage is determined by the triode structure contained inside the three-terminal voltage regulator D3. When the sampled voltage is higher than 1.5V, the triode remains in a non-conducting state. At this time, the opto-coupler U2 does not work, which means that the light emitter of the opto-coupler is not activated, and the light detector at the back end of the opto-coupler will not detect light. Therefore, the opto-coupler is not conducting, and the Signal signal output remains at a low level (0V), indicating that the current state is normal or there is no alarm requirement. When the sampled voltage is lower than 1.5V, the internal triode of the three-terminal voltage regulator D3 conducts. This conduction behavior drives the opto-coupler element in the opto-coupler U2 to start working, and the light emitter of the opto-coupler emits a light signal. After the light detector at the back end of the opto-coupler detects the light signal, the circuit at the back end of the opto-coupler conducts, and then the Signal signal is switched from the original low level (0V) to a high level (12V). This high-level signal can be used as a power-off alarm signal to notify the system or the operator that the voltage state of the current device is abnormal or attention needs to be paid. Through the design of the cooperation between this sampling circuit and the opto-coupler, the system can respond in a timely manner when the voltage state changes and output different signal levels to indicate the current state. This design is crucial for the power-off alarm circuit to ensure that a warning can be issued when the voltage is abnormal, preventing device damage or further failures. At the same time, this design can not only meet the conventional power EMC test but also achieve the power alarm function for different voltage values by adjusting the resistance values of R1, R2, and R3 to change the sampled voltage.

[0033] In some alternative embodiments of this embodiment, the resistor component formed by the fifth resistor R5 and the sixth resistor R6 in a parallel relationship can be electrically connected between the first input terminal of the opto-coupler U2 and the second-stage protection circuit, which serves to reduce the total resistance of the circuit, share the current, and improve the power-on efficiency of the circuit.

[0034] Please go back and continue to refer to Figure 2, the output circuit includes a serial communication port, which is used to receive the power-off alarm signal and transmit it to an external circuit. That is, the core component of the output circuit is the serial communication port, which is used to receive the power-off alarm signal and transmit it to an external circuit or system, playing a key role in the transmission of alarm information. When the power-off alarm circuit generates a power-off signal, the signal is transmitted to the output circuit through the aforementioned alarm information circuit and optocoupler circuit. As an output interface, the serial communication port receives this alarm signal and, in accordance with the set communication protocol, converts the signal into serial data and transmits it to an external system. After receiving this signal, the external system can determine whether there is a power-off situation based on the high and low levels (or data content) of the signal and take corresponding measures, such as starting emergency power supply, recording alarm information, or notifying the operator to conduct fault troubleshooting.

[0035] In some alternative embodiments of this embodiment, a power control module U113, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a sixth capacitor C6, and a fifth capacitor C5 are further provided between the third-level protection circuit and the output circuit. During implementation, the main function of the power control module U113 is to convert the DC input voltage of 9V to 75V into a stable output voltage of 12V. The seventh resistor R7 can be used to control the on and off of the power control module U113. The eighth resistor R8 and the ninth resistor R9 are feedback resistors that can fine-tune the output voltage. The sixth capacitor C6 is an electrolytic capacitor, and its main function is to filter the output voltage to obtain a more stable and higher-quality output voltage. The fifth capacitor C5 is a Y capacitor that can absorb high-frequency interference.

[0036] In a second aspect of the present invention, an integrated chip is provided, which includes an integrated chip body and the power-off alarm circuit of the above embodiment, and the power-off alarm circuit is integrated into the integrated chip body through encapsulation.

[0037] In a third aspect of the present invention, a power-off alarm device is provided, which includes a housing and the power-off alarm circuit of the above embodiment, and the power-off alarm circuit is built into the housing.

[0038] In a fourth aspect of the present invention, an industrial Ethernet switch is provided, which includes a switch body and the power-off alarm circuit of the above embodiment, and the power-off alarm circuit is built into the switch body.

[0039] In the integrated chip, power-off warning device and industrial Ethernet switch provided by the present utility model, on the one hand, through the setting of the warning information circuit, when the power-off state of the industrial Ethernet switch is recognized, a power-off warning signal can be generated by the warning information circuit and transmitted to the output circuit to realize the transmission of the power-off warning signal, so as to quickly and accurately send out warning information when the power supply is powered off. On the other hand, through the setting of the first-level protection circuit, the second-level protection circuit, the third-level protection circuit and the energy storage circuit, multi-level power protection is provided in the case of the power EMC test items of the industrial Ethernet switch, thereby improving the test stability of various power EMC test items of the industrial Ethernet switch.

[0040] The specific embodiments of the utility model have been described in detail above, but it is only an example, and the present utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modification or substitution of the utility model is also within the scope of the present utility model. Therefore, equivalent transformations, modifications, improvements, etc. made without departing from the spirit and principle of the present utility model should all be covered within the scope of the present utility model.

Claims

1. A power-off alarm circuit with protection, applied to industrial Ethernet switches, characterized in that: The power-off alarm circuit includes a first-level protection circuit, a second-level protection circuit, a third-level protection circuit, an energy storage circuit, an alarm information circuit and an output circuit; The input end of the first-level protection circuit is used to be electrically connected to the voltage input end, the output end of the first-level protection circuit is electrically connected to the input end of the second-level protection circuit, the output end of the second-level protection circuit is electrically connected to the input end of the energy storage circuit and the input end of the alarm information circuit at the same time, the output end of the alarm information circuit is electrically connected to the output circuit, and the output end of the energy storage circuit is electrically connected to the output circuit via the energy storage circuit; Wherein, when the industrial Ethernet switch is in a power-off state, the alarm information circuit is used to generate a power-off alarm signal and output it to the output circuit, and the output circuit is used to output the power-off alarm signal.

2. The power-off alarm circuit with protection according to claim 1, characterized in that: The first level protection circuit includes a first varistor, a second varistor, a third varistor, a gas discharge device and a filter circuit; One end of the first varistor is electrically connected to the positive pole of the voltage input end, one end of the second varistor, and the first input end of the filter circuit at the same time; the other end of the first varistor is electrically connected to one end of the gas discharge device and one end of the third varistor at the same time; the other end of the third varistor is electrically connected to the other end of the second varistor, the second input end of the filter circuit, and the negative pole of the voltage input end at the same time; the other end of the gas discharge device is grounded; and the output end of the filter circuit is electrically connected to the input end of the second-level protection circuit.

3. The power-off alarm circuit with protection according to claim 2, characterized in that: The filter circuit includes a first inductor, a second inductor and a first capacitor; One end of the first inductor is electrically connected to one end of the first varistor, the positive pole of the voltage input terminal, and one end of the second varistor. The other end of the first inductor is electrically connected to one end of the first capacitor and the second-level protection circuit. One end of the second inductor is electrically connected to the other end of the third varistor, the other end of the second varistor, and the negative pole of the voltage input terminal. The other end of the second inductor is electrically connected to the other end of the first capacitor and the second-level protection circuit.

4. The power-off alarm circuit with protection according to claim 3 is characterized in that: The second level protection circuit includes a common mode inductor and a first Zener diode; One end of the first Zener diode is electrically connected to the first input end of the common-mode inductor, the other end of the first inductor coil, and one end of the first capacitor at the same time, and the other end of the first Zener diode is electrically connected to the second input end of the common-mode inductor, the other end of the second inductor coil, and the other end of the first capacitor at the same time.

5. The power-off alarm circuit with protection according to claim 4, characterized in that: The energy storage circuit includes a second capacitor and a third capacitor; One end of the second capacitor is electrically connected to one end of the third capacitor, the third-level protection circuit, the alarm information circuit, and the first output end of the common-mode inductor, and the other end of the second capacitor is electrically connected to the third-level protection circuit, the second output end of the common-mode inductor, and the other end of the third capacitor.

6. The power-off alarm circuit with protection according to claim 1, characterized in that: The alarm information circuit includes a voltage sampling circuit, a three-terminal voltage regulator and a photoelectric coupler; The input end of the voltage sampling circuit is electrically connected to the output end of the second-stage protection circuit, the input end of the energy storage circuit, and the input end of the third-stage protection circuit at the same time; the output end of the voltage sampling circuit is electrically connected to the input end of the photoelectric coupler via the three-terminal regulator; and the output end of the photoelectric coupler is electrically connected to the output circuit; Among them, when the industrial Ethernet switch is in a power-off state, the sampling voltage collected by the voltage sampling circuit is lower than the preset voltage threshold, the three-terminal regulator is turned on, and the photoelectric coupler generates a power-off alarm signal and outputs it to the output circuit.

7. The power-off alarm circuit with protection according to claim 1, characterized in that: The output circuit includes a serial communication port, an input end of the serial communication port is electrically connected to the output end of the energy storage circuit, the output end of the alarm information circuit, and the output end of the third-level protection circuit, the output end of the serial communication port is used to be electrically connected to an external circuit, and the serial communication port is used to receive the power-off alarm signal and transmit it to the external circuit.

8. An integrated chip, characterized in that: It comprises an integrated chip body and a power-off alarm circuit as claimed in any one of claims 1 to 7, wherein the power-off alarm circuit is integrated into the integrated chip body through packaging.

9. A power failure alarm device, characterized in that: It comprises a shell and a power-off alarm circuit as claimed in any one of claims 1 to 7, wherein the power-off alarm circuit is built in the shell.

10. An industrial Ethernet switch, characterized in that: It comprises a switch body and a power-off alarm circuit as claimed in any one of claims 1 to 7, wherein the power-off alarm circuit is built in the switch body.

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