Emergency stop circuit, method, and switching power supply device

Abstract

The application discloses an emergency stop circuit, method and switching power supply device, and relates to the technical field of switching power supply.The emergency stop circuit comprises a relay module and a main circuit module;the relay module comprises real-time contacts and delay contacts;the main circuit module comprises a chopping unit and a target contactor;the real-time contacts are connected with the chopping unit;the delay contacts are connected with the target contactor;wherein, the real-time contacts disconnect the contact connection according to the received emergency stop signal, and stop outputting the enable signal;the chopping unit performs chopping processing on the received voltage according to the enable signal, and stops the chopping processing when the enable signal is not received;the delay contacts disconnect the contact connection after delaying for a preset time according to the emergency stop signal;the target contactor controls itself to be turned off when the delay contacts disconnect the contact connection.The application solves the problem that the switching power supply device in the prior art may not realize safe turn-off in an emergency, and achieves the effect of improving the emergency stop reliability of the switching power supply.

Description

Technical Field

[0001] This invention relates to the field of switching power supply technology, and in particular to an emergency stop circuit, method, and switching power supply device. Background Technology

[0002] A switching power supply is an electrical energy conversion device that converts a voltage provided by a power source into the voltage or current required by a target device through various architectures. Today, the demand for equipment using switching power supplies, such as testing and inspection equipment, is increasing, and their safety requirements are also gradually becoming more stringent.

[0003] Currently, in emergency situations, hardware is typically used to achieve emergency shutdown of the switching power supply, thereby shutting down the target device. However, under high current conditions, contactor contacts in switching power supplies may stick, preventing the target device from being shut down. Therefore, existing switching power supplies may not be able to achieve safe shutdown in emergency situations, presenting a technical problem of low reliability. Summary of the Invention

[0004] The main objective of this invention is to provide an emergency stop circuit, method, and switching power supply device, which aims to solve the technical problem that switching power supply devices in the prior art may not be able to achieve safe shutdown in emergency situations.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an emergency stop circuit, which is applied to a switching power supply device, and the emergency stop circuit includes a relay module and a main circuit module;

[0007] The relay module includes real-time contacts and delayed contacts, and the main circuit module includes a chopper unit and a target contactor; the real-time contacts are connected to the chopper unit, and the delayed contacts are connected to the target contactor; wherein...

[0008] The real-time contact is used to disconnect the contact connection in real time according to the received emergency stop signal, and stop outputting the enable signal to the chopper unit.

[0009] The chopper unit is used to chop the received voltage according to the enable signal, and to stop the chopping process when the enable signal is not received.

[0010] The time-delay contact is used to disconnect the contact connection after a preset time according to the emergency stop signal;

[0011] The target contactor is used to control itself to turn off when the delayed contact disconnects the contact connection.

[0012] Optionally, in the above-mentioned emergency stop circuit, the input terminal of the main circuit module is connected to the power supply, and the output terminal is connected to the target device; the main circuit module further includes:

[0013] The system includes an input contactor, a rectifier unit, and an output contactor; the input contactor is connected to the power supply and the rectifier unit, the rectifier unit is connected to the chopper unit, and the output contactor is connected to the chopper unit and the target device.

[0014] The input contactor is used to control the input voltage of the power source.

[0015] The rectifier unit is used to rectify the input voltage and output the rectified voltage to the chopper unit;

[0016] The chopper unit is used to chop the rectified voltage according to the enable signal and output the power supply voltage.

[0017] The output contactor is used to control the power supply voltage output to the target device;

[0018] The target contactor is the input contactor and / or the output contactor.

[0019] Optionally, in the above emergency stop circuit, when the target contactor includes the input contactor and the output contactor, the delay contact includes a first delay contact and a second delay contact; the first delay contact is connected to the input contactor, and the second delay contact is connected to the output contactor;

[0020] The first and second delayed contacts disconnect after a preset time according to the emergency stop signal. When the first delayed contact disconnects, the input contactor controls itself to turn off. When the second delayed contact disconnects, the output contactor controls itself to turn off.

[0021] Optionally, the above-mentioned emergency stop circuit further includes:

[0022] A reset button, which is connected to the relay module via two auxiliary contacts;

[0023] The first auxiliary contact is an auxiliary contact of the input contactor, and the second auxiliary contact is an auxiliary contact of the output contactor.

[0024] Optionally, in the above emergency stop circuit, when the target contactor includes the output contactor, the delay contact includes a third delay contact; the third delay contact is connected to the output contactor.

[0025] The third delay contact disconnects after a preset time according to the emergency stop signal, and the output contactor controls itself to shut down when the third delay contact disconnects.

[0026] Optionally, the above-mentioned emergency stop circuit further includes:

[0027] A reset button, which is connected to the relay module via an auxiliary contact;

[0028] The third auxiliary contact is the auxiliary contact of the output contactor.

[0029] Optionally, the above-mentioned emergency stop circuit further includes:

[0030] An emergency stop button, which is connected to the relay module;

[0031] The emergency stop button is used to generate an emergency stop signal and send the emergency stop signal to the relay module.

[0032] Optionally, in the above emergency stop circuit, the emergency stop button is a dual-channel emergency stop button, which is connected to the relay module through a dual-channel wiring method.

[0033] Secondly, the present invention provides an emergency stop method based on the emergency stop circuit described above, the method comprising:

[0034] The chopper unit performs chopping processing on the received voltage based on the received enable signal;

[0035] The real-time contact disconnects the contact connection in real time according to the received emergency stop signal, and stops outputting the enable signal to the chopper unit;

[0036] The chopper unit stops performing the chopper process when it does not receive the enable signal.

[0037] The delay contact disconnects after a preset time delay based on the emergency stop signal;

[0038] When the delayed contact disconnects the contact connection, the target contactor controls itself to turn off.

[0039] Thirdly, the present invention provides a switching power supply device, the device comprising:

[0040] The power supply, the emergency stop circuit as described above, and the target device are connected in sequence.

[0041] The above-described one or more technical solutions provided by this invention can have the following advantages or at least achieve the following technical effects:

[0042] This invention proposes an emergency stop circuit, method, and switching power supply device. The circuit connects to the chopper unit of the main circuit module via a real-time contact of a relay module. Upon receiving an emergency stop signal, the real-time contact first disconnects, stopping the output enable signal to the chopper unit. If no enable signal is received, the chopper unit stops chopping and shuts off the output voltage. Then, the relay module connects to the target contactor of the main circuit module via a time-delay contact, delaying the disconnection of the time-delay contact to control the target contactor's own shutdown. This ensures that the target contactor is safely shut off only after the main circuit module has stopped outputting voltage. This invention, through a combination of software and hardware shutdown, increases the reliability of the switching power supply shutdown in emergency situations requiring an emergency stop, thus ensuring equipment safety. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a connection block diagram of the first embodiment of the emergency stop circuit of the present invention;

[0045] Figure 2 This is a connection diagram of the second embodiment of the emergency stop circuit of the present invention;

[0046] Figure 3 for Figure 2 Circuit diagram of the relay module;

[0047] Figure 4 This is a connection diagram of the second embodiment of the emergency stop circuit of the present invention;

[0048] Figure 5 for Figure 4 Circuit diagram of the relay module;

[0049] Figure 6 This is a flowchart illustrating the first embodiment of the emergency stop method of the present invention.

[0050] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and accompanying drawings. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0052] It should be noted that in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element. In this invention, unless otherwise expressly specified and limited, the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements.

[0053] In this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. In this invention, the use of suffixes such as "module," "component," or "unit" to denote elements is solely for illustrative purposes and has no specific meaning in itself. Therefore, "module," "component," or "unit" may be used interchangeably.

[0054] For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to the specific circumstances. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0055] Analysis of existing technologies reveals that there is a growing demand for equipment using switching power supplies, such as testing and detection equipment, and the requirements for their safety levels are gradually increasing.

[0056] Currently, in emergency situations, hardware-based emergency shutdown of the switching power supply is typically used to turn off the target device. Specifically, the user presses the emergency stop button, which controls the output contactor in the switching power supply of the target device to shut down via the emergency stop circuit. However, under high current conditions, the contacts of the output contactor may stick, preventing the target device from being shut down. Therefore, existing switching power supplies may not be able to achieve safe shutdown in emergency situations, exhibiting a low reliability issue.

[0057] In view of the technical problem that existing switching power supply devices may not be able to achieve safe shutdown in emergency situations, the present invention provides an emergency stop circuit for switching power supply devices, the general idea of ​​which is as follows:

[0058] The emergency stop circuit includes a relay module and a main circuit module. The relay module includes a real-time contact and a delayed contact. The main circuit module includes a chopper unit and a target contactor. The real-time contact is connected to the chopper unit, and the delayed contact is connected to the target contactor. The real-time contact is used to disconnect the contact connection in real time upon receiving an emergency stop signal, stopping the output of an enable signal to the chopper unit. The chopper unit is used to chop the received voltage according to the enable signal, and stops chopping when no enable signal is received. The delayed contact is used to disconnect the contact connection after a preset delay according to the emergency stop signal. The target contactor is used to control itself to turn off when the delayed contact disconnects the contact connection.

[0059] The above technical solution first connects the real-time contact of the relay module to the chopper unit of the main circuit module. Upon receiving an emergency stop signal, the real-time contact disconnects, stopping the output enable signal to the chopper unit. The chopper unit stops chopping and shuts off the output voltage when no enable signal is received. Then, the relay module connects to the target contactor of the main circuit module via a delay contact, delaying the disconnection of the delay contact to control the target contactor's own shutdown. This ensures that the target contactor is safely shut off only after the main circuit module stops outputting voltage. This invention, through a combination of software and hardware shutdown, increases the reliability of the power supply shutdown in emergency situations requiring an emergency stop, thus ensuring equipment safety.

[0060] The emergency stop circuit, method, and switching power supply device provided by the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments and implementation methods.

[0061] Example 1

[0062] Reference Figure 1The connection diagram illustrates a first embodiment of the emergency stop circuit of the present invention, which is applied to a switching power supply device. The switching power supply device processes the voltage supplied by the power source to supply power to the target device.

[0063] The power supply can be three-phase or single-phase; it can be a battery-powered device or a mains bus interface. The target device can be any load device that requires voltage processing by a switching power supply, such as various testing equipment, inspection equipment, etc.

[0064] Based on the above-mentioned switching power supply device, the following is combined with Figure 1 The connection diagram shown provides a detailed description of the emergency stop circuit in this embodiment. The emergency stop circuit includes:

[0065] Relay module and main circuit module;

[0066] The relay module includes real-time contacts and delayed contacts, and the main circuit module includes a chopper unit and a target contactor; the real-time contacts are connected to the chopper unit, and the delayed contacts are connected to the target contactor; wherein...

[0067] The real-time contact is used to disconnect the contact connection in real time according to the received emergency stop signal, and stop outputting the enable signal to the chopper unit.

[0068] The chopper unit is used to chop the received voltage according to the enable signal, and to stop the chopping process when the enable signal is not received.

[0069] The time-delay contact is used to disconnect the contact connection after a preset time according to the emergency stop signal;

[0070] The target contactor is used to control itself to turn off when the delayed contact disconnects the contact connection.

[0071] Specifically, the relay module can be connected to the emergency stop button. Upon user pressing the emergency stop button, an emergency stop signal is generated and sent to the relay module. Both the real-time and delayed contacts are normally open. The main circuit module can be a switching power supply circuit that processes the power supply. Its input is connected to the power source, and its output is connected to the target device, providing the target device with a voltage that meets its requirements.

[0072] Furthermore, the input terminal of the main circuit module is connected to the power supply, and the output terminal is connected to the target device; the main circuit module also includes:

[0073] The system includes an input contactor, a rectifier unit, and an output contactor; the input contactor is connected to the power supply and the rectifier unit, the rectifier unit is connected to the chopper unit, and the output contactor is connected to the chopper unit and the target device.

[0074] The input contactor is used to control the input voltage of the power source.

[0075] The rectifier unit is used to rectify the input voltage and output the rectified voltage to the chopper unit;

[0076] The chopper unit is used to chop the rectified voltage according to the enable signal and output the power supply voltage.

[0077] The output contactor is used to control the power supply voltage output to the target device;

[0078] The target contactor is the input contactor and / or the output contactor.

[0079] Specifically, the main circuit module rectifies and converts the voltage provided by the power supply before supplying it to the target device to enable the target device to operate. In actual implementation, a processing unit located between the input contactor and the chopper unit can be added according to the actual situation. For example, only a rectifier unit connected between the input contactor and the chopper unit can be set; alternatively, a filter unit connected between the input contactor and the rectifier unit can be added. The power supply processing unit located between the input contactor and the chopper unit in the main circuit module can be configured according to the actual situation.

[0080] The target contactor can be either the input or output contactor of the main circuit module in the switching power supply. In certain specific cases, since the input contactor cannot be turned off, the target contactor can also be only the output contactor of the main circuit module in the switching power supply. When the input and output contactors are turned off, or when the output contactor is turned off, the switching power supply is shut down and will not be able to supply power to the target device, thereby turning off the target device.

[0081] The specific work process is as follows:

[0082] Under normal circumstances, the real-time and delayed contacts of the relay module are closed, the main circuit module is working normally, that is, the chopper unit is working normally, and the target contactors are all in the ON state. At this time, the real-time and delayed contacts of the relay module are also in the OFF state. The real-time contact receives the enable signal and outputs the enable signal to the main circuit module. The main circuit module filters and rectifies the voltage after the power input passes through the input contactor, and outputs a constant DC voltage to the chopper unit. The chopper unit, based on the enable signal, converts the received processed voltage according to the requirements of the target device, and outputs a voltage that meets the requirements of the target device. This voltage is then output to the target device through the ON output contactor, providing normal power to the target device and realizing the normal operation of the main circuit.

[0083] In emergency situations, such as when a user discovers a malfunction in the target equipment, a short circuit, or a fire, requiring the target equipment to be shut down, the user can directly press the emergency stop button to send an emergency stop signal to the relay module. Alternatively, an emergency stop signal generated by another control cabinet with a fault detection system can be sent to the relay module. Upon receiving the emergency stop signal, the relay module first disconnects its contact in real time based on the received emergency stop signal, stopping the output enable signal to the chopper unit. Since the chopper unit does not receive the enable signal, it stops chopping. Then, the time-delay contact disconnects its contact after receiving the emergency stop signal and after a preset delay, causing the target contactor to shut down accordingly. Therefore, this system achieves the safe shutdown of the switching power supply by first software-shutting down the chopper unit to stop chopping (i.e., reducing the output current) and then hardware-shutting down the target contactor, thus ensuring the safe shutdown of the target equipment.

[0084] The emergency stop circuit provided in this embodiment connects to the chopper unit of the main circuit module via the real-time contact of the relay module. Upon receiving an emergency stop signal, the real-time contact first disconnects, stopping the output enable signal to the chopper unit. When no enable signal is received, the chopper unit stops chopping and shuts off the output voltage. Then, it connects to the target contactor of the main circuit module via the delay contact of the relay module, delaying the disconnection of the delay contact to control the target contactor to turn off itself. This achieves the goal of safely shutting off the target contactor only after the main circuit module stops outputting voltage. This invention, through a combination of software and hardware shutdown, increases the reliability of the power supply shutdown in emergency situations requiring an emergency stop, ensuring equipment safety.

[0085] Example 2

[0086] Based on the same inventive concept, referring to Figures 2 to 3 Based on Embodiment 1, a second embodiment of the emergency stop circuit of the present invention is proposed, which is also applied to a switching power supply device. The following is in conjunction with... Figure 2The connection diagram shown provides a detailed description of the emergency stop circuit in this embodiment.

[0087] Furthermore, when the target contactor includes the input contactor and the output contactor, the delay contact includes a first delay contact and a second delay contact; the first delay contact is connected to the input contactor, and the second delay contact is connected to the output contactor;

[0088] The first and second delayed contacts disconnect after a preset time according to the emergency stop signal. When the first delayed contact disconnects, the input contactor controls itself to turn off. When the second delayed contact disconnects, the output contactor controls itself to turn off.

[0089] In this embodiment, to ensure reliable and safe shutdown of the switching power supply device, both its input and output contactors can be shut down simultaneously, and these two contactors are designated as target contactors. Correspondingly, as... Figure 3 The circuit diagram of the relay module shown is illustrated. The relay module includes a real-time contact K1, a first delayed contact KT1, and a second delayed contact KT2. Specifically, one end of the real-time contact K1 is connected to the operating voltage, such as the DC voltage provided by a 24V power supply, and the other end is connected to the controller of the chopper unit of the main circuit module, serving as the non-delayed channel of the relay module. One end of the first delayed contact KT1 is connected to the operating voltage, and the other end is connected to the coil of the input contactor of the main circuit module. One end of the second delayed contact KT2 is connected to the operating voltage, and the other end is connected to the coil of the output contactor of the main circuit module, serving as the two delayed channels of the relay module.

[0090] The specific work process is as follows:

[0091] Under normal circumstances, the real-time and delayed contacts of the relay module are closed, the main circuit module is working normally, that is, the chopper unit is working normally, and both the input and output contactors are in the ON state. At this time, the real-time contact K1, the first delayed contact KT1, and the second delayed contact KT2 of the relay module are also connected. The first delayed contact KT1 and the second delayed contact KT2 control both the input and output contactors to be in the ON state. The real-time contact receives the enable signal and outputs the enable signal to the main circuit module. The main circuit module filters and rectifies the voltage after the power input passes through the input contactor, and outputs a constant DC voltage to the chopper unit. The chopper unit, based on the enable signal, converts the received processed voltage according to the requirements of the target device and outputs a voltage that meets the requirements of the target device. This voltage is then output to the target device through the ON output contactor, providing normal power to the target device and realizing the normal operation of the main circuit.

[0092] In an emergency, upon receiving an emergency stop signal, the relay module first disconnects its contacts in real time based on the received emergency stop signal, stopping the output enable signal to the chopper unit. Since the chopper unit does not receive the enable signal, it stops chopping. Then, upon receiving the emergency stop signal and after a preset delay, the first delay contact KT1 and the second delay contact KT2 disconnect their own contacts, causing the input and output contactors to shut down accordingly. Specifically, this shutdown is achieved by disconnecting their own coil circuits. Therefore, this process first software-shuts down the chopper unit to stop chopping (i.e., reduces the output current), and then hardware-shuts down the input and output contactors, ensuring the safe shutdown of the switching power supply and ultimately shutting down the target device.

[0093] After software shutdown of the chopper unit, hardware shutdown of both the input and output contactors is performed simultaneously, resulting in high shutdown reliability and ensuring the safety of other devices between the input and output contactors.

[0094] Furthermore, the emergency stop circuit also includes:

[0095] A reset button, which is connected to the relay module via two auxiliary contacts;

[0096] The first auxiliary contact is an auxiliary contact of the input contactor, and the second auxiliary contact is an auxiliary contact of the output contactor.

[0097] like Figure 3 The circuit diagram of the relay module shown is shown. The relay module is connected to the reset button S2. Specifically, the reset button S2 is connected through the first auxiliary contact KM1 and the second auxiliary contact KM2. Both the first auxiliary contact KM1 and the second auxiliary contact KM2 are normally closed contacts.

[0098] When the relay module needs to be reset, the user presses the reset button S2. The relay module is only reset after both the first auxiliary contact KM1 and the second auxiliary contact KM2 are disconnected, thus improving the safety of the relay module. Auxiliary contacts are set according to the number of target contactors controlled by the relay module in the main circuit module, avoiding component waste and complex circuit connections that could affect overall operation.

[0099] Furthermore, the emergency stop circuit also includes:

[0100] An emergency stop button, which is connected to the relay module;

[0101] The emergency stop button is used to generate an emergency stop signal and send the emergency stop signal to the relay module.

[0102] Furthermore, the emergency stop button is a dual-channel emergency stop button, which is connected to the relay module through a dual-channel wiring method.

[0103] like Figure 3 The circuit diagram of the relay module shown is shown. The relay module is connected to the emergency stop button S1. Specifically, the emergency stop button S1 is connected to the emergency stop button S1 through a dual-channel wiring method. The emergency stop button S1 is a dual-channel emergency stop button.

[0104] When the emergency stop button S1 is pressed, an emergency stop signal is generated and sent to the relay module, specifically, simultaneously to the real-time contact K1, the first delayed contact KT1, and the second delayed contact KT2.

[0105] In this embodiment, the dual-channel wiring method increases the number of circuits, avoids the possibility of failure caused by contact sticking of a single circuit, and improves the safety of the switching power supply device.

[0106] It should be noted that more implementation details of the above emergency stop circuit implementation method can be found in the description of the specific implementation method in Embodiment 1. For the sake of brevity, these details will not be repeated here.

[0107] The emergency stop circuit provided in this embodiment first performs a software shutdown of the chopper unit, and after a short delay, continues to perform a hardware shutdown of the input contactor and the output contactor, and shuts them down simultaneously. When the target contactor is shut down, since the main circuit current has already decreased, the reliability of its own shutdown can be effectively increased. Therefore, the reliability of shutdown in emergency situations is increased, and the safety level of the equipment is improved.

[0108] Example 3

[0109] Based on the same inventive concept, referring to Figures 4 to 5 Based on Embodiment 1, a third embodiment of the emergency stop circuit of the present invention is proposed, which is also applied to a switching power supply device. The following is in conjunction with... Figure 4 The connection diagram shown provides a detailed description of the emergency stop circuit in this embodiment.

[0110] Furthermore, when the target contactor includes the output contactor, the delay contact includes a third delay contact; the third delay contact is connected to the output contactor.

[0111] The third delay contact disconnects after a preset time according to the emergency stop signal, and the output contactor controls itself to shut down when the third delay contact disconnects.

[0112] Because in certain specific situations, when an emergency stop is required, the input contactor in the main circuit module cannot or does not need to be turned off, therefore, in this embodiment, only the output contactor is turned off; that is, the output contactor is identified as the target contactor. Correspondingly, as... Figure 5 The circuit diagram of the relay module shown is illustrated. The relay module includes a real-time contact K1 and a third delay contact KT3. Specifically, one end of the real-time contact K1 is connected to the operating voltage, such as the DC voltage provided by a 24V power supply, and the other end is connected to the controller of the chopper unit of the main circuit module, serving as the non-delay channel of the relay module. One end of the third delay contact KT3 is connected to the operating voltage, and the other end is connected to the coil of the output contactor of the main circuit module, serving as the delay channel of the relay module.

[0113] The specific work process is as follows:

[0114] Under normal circumstances, the real-time and delayed contacts of the relay module are closed, the main circuit module is working normally, that is, the chopper unit is working normally, and both the input and output contactors are in the ON state. At this time, the real-time contact and the third delayed contact KT3 of the relay module are also connected. The third delayed contact KT3 controls the output contactor to be in the ON state. The real-time contact receives the enable signal and outputs the enable signal to the main circuit module. The main circuit module filters and rectifies the voltage after the power input passes through the input contactor, and outputs a constant DC voltage to the chopper unit. The chopper unit, based on the enable signal, converts the received processed voltage according to the requirements of the target device and outputs a voltage that meets the requirements of the target device. This voltage is then output to the target device through the ON output contactor, providing normal power to the target device and realizing the normal operation of the main circuit.

[0115] In an emergency, after receiving an emergency stop signal, the relay module first disconnects its contact in real time based on the received emergency stop signal, stopping the output enable signal to the chopper unit. The chopper unit, not receiving the enable signal, stops chopping. Then, the third delay contact KT3, after receiving the emergency stop signal and delaying for a preset time, disconnects its contact, and the output contactor controls its own shutdown, specifically by disconnecting its own coil circuit. Therefore, this achieves the safe shutdown of the switching power supply device by first software-shutting down the chopper unit to stop chopping (i.e., reducing the output current) and then hardware-shutting down the output contactor, thus achieving the shutdown of the target device.

[0116] After software shutdown of the chopper unit, hardware shutdown of the output contactor is performed, taking into full account the situation where the input contactor cannot be shut down. This provides high safety and adaptability, and ensures the safety of both the input and output contactors.

[0117] Furthermore, the emergency stop circuit also includes:

[0118] A reset button, which is connected to the relay module via an auxiliary contact;

[0119] The third auxiliary contact is the auxiliary contact of the output contactor.

[0120] like Figure 5 The circuit diagram of the relay module shown is shown. The relay module is connected to the reset button S2, specifically through the third auxiliary contact KM3, which is a normally closed contact.

[0121] When the relay module needs to be reset, the user presses the reset button S2. The third auxiliary contact KM3 then disconnects, resetting the relay module and improving its safety. Auxiliary contacts are configured according to the number of target contactors controlled by the relay module in the main circuit module, avoiding component waste and complex circuit connections that could affect overall operation.

[0122] Furthermore, the emergency stop circuit also includes:

[0123] An emergency stop button, which is connected to the relay module;

[0124] The emergency stop button is used to generate an emergency stop signal and send the emergency stop signal to the relay module.

[0125] Furthermore, the emergency stop button is a dual-channel emergency stop button, which is connected to the relay module through a dual-channel wiring method.

[0126] like Figure 5 The circuit diagram of the relay module shown is shown. The relay module is connected to the emergency stop button S1. Specifically, the emergency stop button S1 is connected to the emergency stop button S1 through a dual-channel wiring method. The emergency stop button S1 is a dual-channel emergency stop button.

[0127] When the emergency stop button S1 is pressed, an emergency stop signal is generated and sent to the relay module, specifically, simultaneously to the real-time contact K1 and the third delayed contact KT3.

[0128] In this embodiment, the dual-channel wiring method increases the number of circuits, avoids the possibility of failure caused by contact sticking of a single circuit, and improves the safety of the switching power supply device.

[0129] It should be noted that more implementation details of the above emergency stop circuit implementation method can be found in the description of the specific implementation method in Embodiment 1. For the sake of brevity, these details will not be repeated here.

[0130] The emergency stop circuit provided in this embodiment first performs a software shutdown of the chopper unit, followed by a short delay, and then performs a hardware shutdown of the output contactor. When the output contactor is shut down, the main circuit current has already decreased, effectively increasing the reliability of its shutdown. Therefore, it increases the reliability of shutdown in emergency situations and improves the safety level of the equipment. Unlike Embodiment 2, the emergency stop circuit in this embodiment can meet the requirement that the input contactor cannot be disconnected in certain situations. Therefore, the delay contact and target contactor can be set based on actual needs, exhibiting high adaptability.

[0131] Example 4

[0132] Based on the same inventive concept, referring to Figure 6 This embodiment proposes an emergency stop method based on the emergency stop circuit described above, which can be applied to switching power supply devices.

[0133] Specifically, the emergency stop circuit includes a relay module and a main circuit module; the relay module includes a real-time contact and a delayed contact, and the main circuit module includes a chopper unit and a target contactor; the real-time contact is connected to the chopper unit, and the delayed contact is connected to the target contactor.

[0134] Based on the above emergency stop circuit, such as Figure 6 The flowchart shown illustrates that an emergency stop method may include the following steps:

[0135] Step S10: The chopper unit performs chopping processing on the received voltage according to the received enable signal;

[0136] Step S20: The real-time contact disconnects the contact connection in real time according to the received emergency stop signal, and stops outputting the enable signal to the chopper unit;

[0137] Step S30: The chopper unit stops performing the chopper process when it does not receive the enable signal;

[0138] Step S40: The delay contact disconnects after a preset delay based on the emergency stop signal;

[0139] Step S50: When the delayed contact disconnects the contact connection, the target contactor controls itself to turn off.

[0140] Furthermore, the input terminal of the main circuit module is connected to the power supply, and the output terminal is connected to the target device; the main circuit module may also include:

[0141] The system includes an input contactor, a rectifier unit, and an output contactor; the input contactor is connected to the power supply and the rectifier unit, the rectifier unit is connected to the chopper unit, and the output contactor is connected to the chopper unit and the target device.

[0142] Correspondingly, step S10 may include:

[0143] Step S11: The input contactor controls the input voltage of the power source;

[0144] Step S12: The rectifier unit rectifies the input voltage and outputs the rectified voltage to the chopper unit;

[0145] Step S13: The chopper unit performs chopping processing on the rectified voltage according to the enable signal and outputs the supply voltage;

[0146] Step S14: The output contactor controls the power supply voltage output to the target device;

[0147] The target contactor is the input contactor and / or the output contactor.

[0148] In one embodiment, when the target contactor includes the input contactor and the output contactor, the delay contact includes a first delay contact and a second delay contact; the first delay contact is connected to the input contactor, and the second delay contact is connected to the output contactor.

[0149] Correspondingly, step S40 may include:

[0150] Step S41: The first delay contact and the second delay contact disconnect after a preset delay time according to the emergency stop signal;

[0151] Step S42: When the first delay contact disconnects, the input contactor controls itself to turn off; at the same time, when the second delay contact disconnects, the output contactor controls itself to turn off.

[0152] Furthermore, the emergency stop circuit also includes:

[0153] A reset button is provided, which is connected to the relay module via two auxiliary contacts; the first auxiliary contact is an auxiliary contact of the input contactor, and the second auxiliary contact is an auxiliary contact of the output contactor.

[0154] Correspondingly, this emergency stop method may also include:

[0155] Step S60: When both the first auxiliary contact and the second auxiliary contact are open, the relay module is reset.

[0156] In another embodiment, when the target contactor includes the output contactor, the delay contact includes a third delay contact; the third delay contact is connected to the output contactor.

[0157] Correspondingly, step S40 may include:

[0158] Step S43: The third delay contact disconnects after a preset delay based on the emergency stop signal;

[0159] Step S44: When the third delay contact disconnects the contact connection, the output contactor controls itself to turn off.

[0160] Furthermore, the emergency stop circuit also includes:

[0161] A reset button, which is connected to the relay module via an auxiliary contact;

[0162] The third auxiliary contact is the auxiliary contact of the output contactor.

[0163] Correspondingly, this emergency stop method may also include:

[0164] Step S70: When the third auxiliary contact is disconnected, the relay module is reset.

[0165] In another embodiment, the emergency stop circuit further includes:

[0166] An emergency stop button is provided, which is connected to the relay module. The emergency stop button is a dual-channel emergency stop button, connected to the relay module via a dual-channel wiring method.

[0167] Correspondingly, before step S10, this emergency stop method may also include:

[0168] Step S01: When the emergency stop button is pressed, an emergency stop signal is generated and sent to the relay module. Specifically, it is simultaneously sent to the real-time contact and the time-delay contact.

[0169] It should be noted that the functions and corresponding technical effects of each step in the emergency stop method provided in this embodiment can be referred to the description of the specific implementation methods in the various embodiments of the emergency stop circuit of this invention. For the sake of brevity, they will not be repeated here.

[0170] Example 5

[0171] Based on the same inventive concept, this embodiment provides a switching power supply device, which includes:

[0172] The power supply, emergency stop circuit, and target device are connected in sequence.

[0173] Specifically, the switching power supply device can be an integral part of the target device or an independent device, depending on the actual situation.

[0174] The specific structure of the emergency stop circuit can be referred to in embodiments one to three above. Since this embodiment adopts all the technical solutions of the emergency stop circuits in embodiments one to three above, it has at least all the beneficial effects brought about by the technical solutions in embodiments one to three above, and will not be described in detail here.

[0175] It should be noted that the sequence numbers of the above embodiments of the present invention are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The above descriptions are only optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made under the inventive concept of the present invention using the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are all included within the patent protection scope of the present invention.

Claims

1. An emergency stop circuit, characterized by The emergency stop circuit is applied to a switching power supply device, and comprises a relay module and a main circuit module; The relay module comprises real-time contacts and delay contacts, and the main circuit module comprises a chopping unit and a target contactor; the real-time contacts are connected with the chopping unit, and the delay contacts are connected with the target contactor; wherein, The real-time contacts are used for disconnecting the contact connection in real time according to the received emergency stop signal, and stopping the output of an enable signal to the chopping unit; The chopping unit is used for chopping the received voltage according to the enable signal, and stopping the chopping when the enable signal is not received; The delay contacts are used for disconnecting the contact connection after a preset time delay according to the emergency stop signal; The target contactor is used for controlling self-off when the delay contacts disconnect the contact connection.

2. The trip circuit of claim 1, wherein The input end of the main circuit module is connected with a power supply, and the output end is connected with a target device; the main circuit module further comprises: an input contactor, a rectifying unit and an output contactor; the input contactor is connected with the power supply and the rectifying unit respectively, the rectifying unit is connected with the chopping unit, and the output contactor is connected with the chopping unit and the target device respectively; The input contactor is used for controlling the input voltage received from the power supply; The rectifying unit is used for rectifying the input voltage and outputting a rectified voltage to the chopping unit; The chopping unit is used for chopping the rectified voltage according to the enable signal and outputting a supply voltage; The output contactor is used for controlling the supply voltage output to the target device; The target contactor is the input contactor and / or the output contactor.

3. The trip circuit of claim 2, wherein, When the target contactor comprises the input contactor and the output contactor, the delay contacts comprise first delay contacts and second delay contacts; the first delay contacts are connected with the input contactor, and the second delay contacts are connected with the output contactor; The first delay contacts and the second delay contacts disconnect the contact connection after a preset time delay according to the emergency stop signal; the input contactor controls self-off when the first delay contacts disconnect the contact connection, and the output contactor controls self-off when the second delay contacts disconnect the contact connection.

4. The trip circuit of claim 3, wherein, The emergency stop circuit further comprises: a reset button connected with the relay module through two auxiliary contacts; The first auxiliary contact is an auxiliary contact of the input contactor, and the second auxiliary contact is an auxiliary contact of the output contactor.

5. The trip circuit of claim 2, wherein, When the target contactor comprises the output contactor, the delay contacts comprise third delay contacts; the third delay contacts are connected with the output contactor; The third delay contacts disconnect the contact connection after a preset time delay according to the emergency stop signal, and the output contactor controls self-off when the third delay contacts disconnect the contact connection.

6. The trip circuit of claim 5, wherein, The emergency stop circuit further comprises: a reset button connected with the relay module through one auxiliary contact; The third auxiliary contact is an auxiliary contact of the output contactor.

7. The trip circuit of claim 1, wherein, The emergency stop circuit further comprises: An emergency stop button connected with the relay module; The emergency stop button is used to generate an emergency stop signal and send the emergency stop signal to the relay module.

8. The emergency stop circuit as described in claim 7, characterized in that, The emergency stop button is a double-channel emergency stop button connected with the relay module through a double-channel wiring mode.

9. An emergency stop method, characterized by, The method based on the emergency stop circuit according to any one of claims 1 to 8 comprises: The chopper unit chops the received voltage according to the received enable signal; The real-time contact breaks the contact connection in real time according to the received emergency stop signal and stops outputting the enable signal to the chopper unit; The chopper unit stops the chopping process when the enable signal is not received; The delay contact breaks the contact connection after a preset time delay according to the emergency stop signal; The target contactor controls itself to be turned off when the delay contact breaks the contact connection.

10. A switching power supply device, characterized by comprising: The device comprises: A power supply, the emergency stop circuit according to any one of claims 1 to 8 and a target device connected in sequence.

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