Door switch interlocking circuit, power distribution system and ATE test system

Abstract

The utility model provides a door switch interlocking circuit, a power distribution system and an ATE test system, the door switch interlocking circuit comprises at least one door switch connected in series between a control power supply and a control end of a main circuit breaker, the main circuit breaker is controlled in an interlocking manner through the door switch, and two ends of each door switch are connected with a door switch monitoring circuit; the door switch monitoring circuit comprises a first resistor, a second resistor and a photoelectric coupler, two input ends of the first resistor and the photoelectric coupler are connected in series between two ends of the door switch, and two output ends of the second resistor and the photoelectric coupler are sequentially connected in series between a pull-up power supply and a grounding end; the system also comprises a microprocessor, and the microprocessor is connected with the second resistor in each door switch monitoring circuit and the connection node of the output end of the photoelectric coupler, and is used for detecting the state of the door switch corresponding to the door switch monitoring circuit according to the received signal. According to the invention, the operation safety and the monitoring performance of the power distribution system are improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment, and particularly to a door switch interlock circuit, a power distribution system, and an ATE test system. Background Art

[0002] In large power distribution systems such as ATE (Automatic Test Equipment, integrated circuit automatic test machine) equipment, to ensure operation safety, power distribution boxes are usually designed with automatic power-off and alarm functions to prevent non-standard operations. However, the traditional door switch interlock function is generally limited to a mechanical interlock structure and cannot effectively detect and process the opening of the cabinet door in the powered-on state in real time. Most of the existing technologies in the research on the application of door switch interlock for electrical equipment still stay at simple mechanical locking and fail to further ensure high-level detectability, thus unable to ensure the safe operation of the power distribution system and prone to causing danger to personal safety when operators perform maintenance. Content of the Utility Model

[0003] In view of this, the main purpose of this application is to provide a door switch interlock circuit, a power distribution system, and an ATE test system, which can realize the interlock control between the door switch and the main circuit breaker in the power distribution system, and can monitor the states of each door switch in real time, improving the operation safety and monitorability of the power distribution system.

[0004] In the first aspect, this application provides a door switch interlock circuit, including at least one door switch connected in series between the control power supply and the control terminal of the main circuit breaker, and interlock controlling the main circuit breaker through the door switch. A door switch monitoring circuit is connected to both ends of each door switch.

[0005] The door switch monitoring circuit includes a first resistor, a second resistor, and an optocoupler. The two input terminals of the first resistor and the optocoupler are connected in series between both ends of the door switch, and the two output terminals of the second resistor and the optocoupler are sequentially connected in series between the pull-up power supply and the ground terminal.

[0006] It further includes a microprocessor, which is respectively connected to the connection node of the second resistor and the output terminal of the optocoupler in each door switch monitoring circuit, and is used to detect the state of the door switch corresponding to the door switch monitoring circuit according to the received signal.

[0007] As described above, in a door switch interlock circuit provided by the present application, at least one door switch is provided between the control power supply and the control terminal of the main circuit breaker, and the interlock control of the main circuit breaker is realized through the door switch. Thus, when the door switch is disconnected, the main circuit breaker can be immediately disconnected, thereby quickly cutting off the power supply and avoiding the electric shock risk caused by the power supply not being cut off. In addition, the present application also provides a door switch monitoring circuit at both ends of each door switch. The door switch monitoring circuit includes an optocoupler and a resistor device, and the output terminal of the optocoupler is connected to a microprocessor. When any door switch is disconnected, the corresponding optocoupler will output a signal to the microprocessor, and the microprocessor can detect which door switch is disconnected according to the received signal, solving the problem that the traditional method cannot locate the problem door switch. Through the present application, the interlock control between the door switch and the main circuit breaker in the power distribution system can be realized, and the states of each door switch can be monitored in real time, so as to quickly locate and handle faults, improving the operation safety and monitorability of the power distribution system.

[0008] Optionally, the door switch monitoring circuit further includes a reverse diode connected between the two input terminals of the optocoupler.

[0009] As described above, by providing a reverse diode at the two input terminals of the optocoupler, reverse protection can be provided for the optocoupler to prevent damage to the optocoupler caused by abnormal input signals (such as reverse voltage).

[0010] Optionally, the control terminal of the main circuit breaker includes a no-voltage release coil of the main circuit breaker. When all the door switches are closed, the no-voltage release coil is energized and the main circuit breaker is attracted. When any one of the door switches is disconnected, the no-voltage release coil loses power and the main circuit breaker is disconnected.

[0011] As described above, by connecting the door switch between the control power supply and the no-voltage release coil of the main circuit breaker, the interlock control of the main circuit breaker is realized. When all the door switches are closed, the control power supply provides a suitable working voltage to the no-voltage release coil of the main circuit breaker through the door switch, and the main circuit breaker is attracted, so that the power supply can supply power to the outside through the main circuit breaker. When any one of the door switches is disconnected, the first resistor in the corresponding door switch monitoring circuit is connected into the power supply circuit, resulting in the voltage provided by the control power supply to the no-voltage release coil of the main circuit breaker being reduced and unable to reach the working voltage required for the main circuit breaker to be attracted, thereby causing the main circuit breaker to be disconnected and the power supply unable to supply power to the outside through the main circuit breaker.

[0012] Optionally, the microprocessor is respectively connected to the connection node between the second resistor and the output terminal of the optocoupler in each door switch monitoring circuit, and the state of each door switch is detected according to the following method;

[0013] When all the door switches are closed, the optocouplers in the door switch monitoring circuits corresponding to each door switch are in the off state, and the pull-up power supply outputs a high-level signal to the microprocessor through the second resistor; when any one of the door switches is opened, the optocoupler in the door switch monitoring circuit corresponding to the opened door switch conducts, and the pull-up power supply outputs a low-level signal to the microprocessor through the second resistor.

[0014] As described above, the microprocessor is respectively connected to the connection nodes of the second resistor and the output end of the optocoupler in each door switch monitoring circuit. When all the door switches are closed, the optocouplers in the corresponding door switch monitoring circuits cannot conduct, so the pull-up power supply sends a high-level signal to the microprocessor through the second resistor. At this time, the microprocessor determines that all the door switches are in the closed state according to the received high-level signal. When any one of the door switches is opened, the first resistor and the optocoupler in the door switch monitoring circuit corresponding to the opened door switch are connected to the power supply circuit, which causes the voltage provided by the control power supply to the under-voltage release coil of the main circuit breaker to be reduced and unable to reach the operating voltage required for the main circuit breaker to close, resulting in the disconnection of the main circuit breaker. And the optocoupler in the door switch monitoring circuit corresponding to the opened door switch conducts. At this time, the level signal at the output end of the optocoupler received by the microprocessor is pulled low. Therefore, the microprocessor can determine that the door switch is opened according to the low-level signal, thus realizing the rapid positioning of the faulty door switch.

[0015] Optionally, the first resistor is a current-limiting resistor, which is used to limit the current of the control power supply after the door switch is opened.

[0016] As described above, the door switch monitoring circuit is provided with a first resistor with a suitable resistance value to limit the current of the control power supply when the corresponding door switch is opened, which causes the voltage provided by the control power supply to the under-voltage release coil of the main circuit breaker to be reduced and unable to reach the operating voltage required for the main circuit breaker to close, resulting in the disconnection of the main circuit breaker.

[0017] Optionally, the microprocessor includes an MCU chip, which is used to receive the signal output by the optocoupler through the I / O interface and upload the processed status information of the door switch to the peripheral device.

[0018] As described above, the microprocessor can select an MCU chip, receive and analyze the signals output by the optocouplers in each door switch monitoring circuit through its I / O interface, and upload the processed status information of the door switch to peripheral devices such as the communication system of the industrial control computer or the power supply cabinet to realize remote monitoring and fault alarm.

[0019] Optionally, the types of the door switches include at least one of the following:

[0020] Non-contact proximity switches or grating switches, contact limit switches or micro switches.

[0021] As described above, through the door switch interlock circuit of the present application, it can be applicable to various types of door switches, and thus can be widely used in the interlock control of electrical equipment.

[0022] In a second aspect, the present application provides a power distribution system, including a power supply, a control power supply, a main circuit breaker, a power cabinet, and the above-mentioned door switch interlock circuit. The power supply of the power supply enters the power cabinet through the closed main circuit breaker.

[0023] The door switch interlock circuit is connected between the control power supply and the control terminal of the main circuit breaker, and is used for interlock control of the main circuit breaker and monitoring the state of the door switch.

[0024] As described above, the present application also provides a power distribution system, including a power supply, a control power supply, a main circuit breaker, and a power cabinet. The power supply of the power supply can enter the power cabinet through the closed main circuit breaker. At the same time, by arranging a door switch interlock circuit between the control power supply and the control terminal of the main circuit breaker, the interlock control of the main circuit breaker can be realized through the door switch, and the state monitoring of the door switch can be realized through the door switch monitoring circuit.

[0025] Optionally, the control power supply is connected to the power supply.

[0026] The power supply of the first power supply circuit of the power supply enters the power cabinet through the closed main circuit breaker, and the power supply of the second power supply circuit of the power supply enters the door switch interlock circuit after being stepped down by the control power supply.

[0027] As described above, to save costs, the power supply can supply power to the control power supply through a separate power supply circuit. The control power supply steps down the power supply of the power supply to provide a suitable working voltage for the subsequent door switch interlock circuit.

[0028] In a third aspect, the present application provides an ATE test system, including a power cabinet and a test head. The power cabinet is used to supply power to the test head.

[0029] The power cabinet is provided with at least one of the above-mentioned door switch interlock circuits for switch interlock control of the power cabinet.

[0030] The test head is provided with at least one of the above-mentioned door switch interlock circuits for switch interlock control of the test head.

[0031] These and other aspects of the present application will become more clearly understood in the following description of the (multiple) embodiments. Brief Description of the Drawings

[0032] Figure 1 It is a circuit diagram of the first door switch interlock circuit provided by the embodiment of the present application.

[0033] Figure 2 This is the circuit diagram of the second door switch interlock circuit provided by the embodiment of the present application;

[0034] Figure 3 This is the structure diagram of a power distribution system provided by the embodiment of the present application;

[0035] Figure 4 This is the structure diagram of an ATE test system provided by the embodiment of the present application. Detailed implementation manners

[0036] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0037] The embodiment of the present application provides a door switch interlock circuit, a power distribution system and an ATE test system, which can realize the interlock control between the door switch and the main circuit breaker in the power distribution system, and can monitor the states of each door switch in real time. It has significant advantages and innovations in large-scale power distribution systems. It not only improves the safety and monitorability of the power distribution system, but also reduces costs and improves flexibility, which is of great significance for ensuring the safe operation of industrial equipment and improving production efficiency.

[0038] As Figure 1 shown, the embodiment of the present application provides a first door switch interlock circuit, including at least one door switch S1 connected in series between the control power supply VCC_1 and the control end of the main circuit breaker, and realizing the interlock control of the main circuit breaker through the door switch S1. A door switch monitoring circuit is connected to both ends of each door switch S1;

[0039] The door switch monitoring circuit includes a resistor R1, a resistor R2 and an optocoupler U1. The two input ends of the resistor R1 and the optocoupler U1 are connected in series between both ends of the door switch S1. The two output ends of the resistor R2 and the optocoupler U1 are sequentially connected in series between the pull-up power supply VCC_2 and the ground terminal GND. The connection node of the output ends of the resistor R2 and the optocoupler U1 is also connected to a microprocessor, which is used to send a high-level or low-level signal to the microprocessor. The microprocessor can be an MCU chip, which is used to detect the state of the door switch corresponding to the door switch monitoring circuit according to the received signal.

[0040] In some embodiments, the control terminal of the main circuit breaker may be the under-voltage release coil of the main circuit breaker. By setting at least one gate switch S1 between the control power supply VCC_1 and the under-voltage release coil of the main circuit breaker, and realizing the interlock control of the main circuit breaker through this gate switch S1. When all the gate switches are closed, the control power supply VCC_1 supplies a suitable working voltage to the under-voltage release coil of the main circuit breaker through the gate switch, and the main circuit breaker is attracted, so as to realize the power supply from the power supply to the outside through the main circuit breaker. When any one of the gate switches is opened, the resistor R1 in the corresponding gate switch monitoring circuit is connected into the power supply circuit, and the power supply of the control power supply VCC_1 is current-limited through this resistor R1, so that the voltage provided by the control power supply VCC_1 to the under-voltage release coil of the main circuit breaker is reduced and cannot reach the working voltage required for the main circuit breaker to be attracted, resulting in the main circuit breaker being disconnected, and the power supply cannot supply power to the outside through the main circuit breaker, avoiding the electric shock risk caused by the power not being cut off. In addition, the connection node of the optocoupler U1 and the resistor R2 in each path of the gate switch monitoring circuit is also connected to the I / O1 interface of the MCU chip. When all the gate switches are closed, the optocouplers U1 in the corresponding gate switch monitoring circuits cannot conduct, and the pull-up power supply VCC_2 sends a high-level signal to the MCU chip through the resistor R2. At this time, the MCU chip judges that all the gate switches are in the closed state according to the received high-level signal. When any one of the gate switches is opened, the resistor R1 and the optocoupler U1 in the gate switch monitoring circuit corresponding to this gate switch are connected into the power supply circuit, which in turn causes the voltage provided by the control power supply VCC_1 to the under-voltage release coil of the main circuit breaker to be reduced and cannot reach the working voltage required for the main circuit breaker to be attracted, resulting in the main circuit breaker being disconnected, and the optocoupler U1 in the gate switch monitoring circuit corresponding to this gate switch conducts, and the level signal received by the MCU chip is pulled low. Therefore, the MCU chip can judge that this gate switch is opened according to this low-level signal, so as to quickly locate the problem gate switch and upload the processed status information of the gate switch to peripheral devices such as the communication system of the industrial control computer or the power cabinet to realize remote monitoring and fault alarm.

[0041] In some embodiments, to save the power supply cost, the power supply can supply power to the devices at the back end (such as the power cabinet) through the main power supply circuit and the main circuit breaker. The power supply can also supply power to the control power supply VCC_1 through another exception circuit. After the control power supply VCC_1 transforms the power supply of the power supply, it provides a suitable working voltage for the gate switch interlock circuit at the back end.

[0042] In some embodiments, on the input side of the optocoupler, if a reverse voltage appears due to some reasons (such as circuit design errors, external power supply failures, or reverse connection of the circuit, etc.), this reverse voltage may directly act on the light-emitting diode of the optocoupler, resulting in breakdown and damage of the light-emitting diode. Based on this, in the embodiments of the present application, by setting a parallel-connected reverse diode D1 at the two input terminals of the optocoupler U1, this reverse voltage can be clamped within the voltage drop of the diode, thereby preventing the light-emitting diode from being damaged by excessive reverse voltage. In addition, this reverse diode can also isolate the positive and negative electrodes of the light-emitting diode, preventing electrostatic discharge from damaging the light-emitting diode, and further improving the reliability and stability of the circuit.

[0043] As Figure 2 shown, the embodiments of the present application also provide a second door switch interlock circuit. This door switch interlock circuit includes a plurality of door switches connected in series between the control power supply VCC_1 and the under-voltage release coil of the main circuit breaker, such as door switches S2 and S3, and realizes the interlock control of the main circuit breaker through these door switches S2 and S3. A door switch monitoring circuit is provided at each end of each door switch S2 and S3;

[0044] The door switch monitoring circuit corresponding to the door switch S2 includes a resistor R3, a resistor R4, and an optocoupler U2. The two input terminals of this resistor R3 and the optocoupler U2 are connected in series between the two ends of the door switch S2. The two output terminals of the resistor R4 and the optocoupler U2 are successively connected in series between the pull-up power supply VCC_2 and the ground terminal GND. Parallel-connected reverse diodes D2 are also provided at the two input terminals of the optocoupler U2 for providing reverse protection for the optocoupler U2. The connection node of the output terminals of the resistor R4 and the optocoupler U2 is also connected to the I / O2 interface of the MCU chip for sending a high-level or low-level signal to the MCU chip, so that the MCU chip can detect the state of the door switch S2 according to the received signal;

[0045] The door switch monitoring circuit corresponding to the door switch S3 includes a resistor R5, a resistor R6, and an optocoupler U3. The two input terminals of this resistor R5 and the optocoupler U3 are connected in series between the two ends of the door switch S3. The two output terminals of the resistor R6 and the optocoupler U3 are successively connected in series between the pull-up power supply VCC_3 and the ground terminal GND. Parallel-connected reverse diodes D3 are also provided at the two input terminals of the optocoupler U3 for providing reverse protection for the optocoupler U3. The connection node of the output terminals of the resistor R6 and the optocoupler U3 is also connected to the I / O3 interface of the MCU chip for sending a high-level or low-level signal to the MCU chip, so that the MCU chip can detect the state of the door switch S3 according to the received signal.

[0046] Based Figure 2The shown door switch interlock circuit can achieve the interlock control of the main circuit breaker through door switches S2 and S3. When both door switches S2 and S3 are closed, the control power supply VCC_1 supplies a suitable operating voltage to the under-voltage release coil of the main circuit breaker through door switches S2 and S3, and the main circuit breaker is attracted, thus enabling the power supply to supply power outward through the main circuit breaker. At this time, the closed door switch S2 shorts the resistor R3 and the optocoupler U2, and the closed door switch S3 shorts the resistor R5 and the optocoupler U3. Therefore, neither the optocoupler U2 nor the optocoupler U3 can conduct. The pull-up power supply VCC_2 outputs a high-level signal to the I / O2 interface of the MCU chip through the resistor R4, and the pull-up power supply VCC_3 outputs a high-level signal to the I / O3 interface of the MCU chip through the resistor R6. At this time, the MCU chip can detect that both door switches S2 and S3 are in the closed state according to the two high-level signals received.

[0047] When any one of the door switches is opened, for example, when the door switch S2 is opened and the door switch S3 is closed, the resistor R3 in the corresponding door switch monitoring circuit is connected to the power supply circuit. The current supply of the control power supply VCC_1 is limited by this resistor R3, so that after the power supply of the control power supply VCC_1 passes through this resistor R3, the optocoupler U2 and the door switch S3 to reach the under-voltage release coil of the main circuit breaker, it cannot reach the operating voltage required for the main circuit breaker to be attracted, resulting in the main circuit breaker being disconnected and the power supply unable to supply power outward through the main circuit breaker. At this time, the light-emitting diode on the input side of the optocoupler U2 emits light under the action of current, driving the photosensitive triode on the output side to conduct. The level signal output by the pull-up power supply VCC_2 through the resistor R4 is pulled low, that is, the I / O2 interface of the MCU chip receives a low-level signal. At this time, the MCU chip can detect that the door switch S2 is in the open state according to this low-level signal. Since the door switch S3 is closed, the resistor R5 and the optocoupler U3 are shorted at this time, so the optocoupler U3 cannot conduct. The pull-up power supply VCC_3 outputs a high-level signal to the I / O3 interface of the MCU chip through the resistor R6. At this time, the MCU chip can detect that the door switch S3 is in the closed state according to this high-level signal.

[0048] Similarly, when the door switch S2 is closed and S3 is opened, or when both door switches S2 and S3 are opened, the conduction principle of the optocouplers U2 and U3 and the detection principle of the MCU chip are the same as the above explanations and will not be elaborated here. Through the embodiments of the present application, when there are multiple door switches used for the safety interlock of the system at the same time, the MCU chip can analyze and process the multiple level signals received, and judge which door switch is opened, so as to quickly locate the problem door switch, and upload the processed status information of the door switch to the industrial control computer or other peripheral devices to achieve remote monitoring and fault alarm.

[0049] It should be noted that resistors R3 and R5 are used in the circuit to limit the current supply of the control power supply VCC_1. Therefore, appropriate resistance values need to be selected for resistors R3 and R5, which can not only limit the current supply of the control power supply VCC_1 when connected to the power supply circuit, resulting in the voltage provided by the control power supply VCC_1 to the under-voltage release coil of the main circuit breaker being reduced and unable to reach the operating voltage required for the main circuit breaker to close, thus causing the main circuit breaker to disconnect, but also ensure that the current after current limiting can turn on the optocoupler.

[0050] In summary, the embodiment of the present application provides a door switch interlock circuit, which directly controls the under-voltage release coil of the main circuit breaker through the door switch, enabling the main circuit breaker to immediately disconnect when the door switch is opened, thus quickly cutting off the power supply and avoiding the electric shock risk caused by the power supply not being cut off, greatly improving the operation safety. And by setting simple and reliable electronic components such as optocouplers at both ends of the door switch and combining with a microprocessor, real-time monitoring of the door switch state is achieved. When any door switch is opened, the corresponding optocoupler will output a signal to the microprocessor, and the microprocessor can accurately judge and report which door switch is opened, solving the problem of being unable to locate the faulty door switch in the traditional method, not only improving the system's monitorability, but also facilitating quick location and handling of faults. At the same time, electronic components such as optocouplers are simpler in design, lower in cost, and easier to implement and maintain compared to complex infrared sensors. The embodiment of the present application has significant advantages and innovativeness in large-scale power distribution systems, without restricting the selection of door switches, making the system more flexible and adaptable in practical applications, which is of great significance for ensuring the safe operation of industrial equipment and improving production efficiency.

[0051] As Figure 3 shown, the embodiment of the present application also provides a power distribution system, including a power supply 100, a main circuit breaker 200, a power cabinet 300, a control power supply 400, and Figure 1 - Figure 2 any one of the door switch interlock circuits 500 described above;

[0052] wherein, the power supply of the power supply 100 enters the power cabinet 300 through the closed main circuit breaker 200, and the door switch interlock circuit 500 is connected between the control power supply 400 and the under-voltage release coil 210 of the main circuit breaker 200, and is used for interlock control of the main circuit breaker 200 and monitoring of the cabinet door switch of the power cabinet 300.

[0053] In some embodiments, the power supply 100 can provide two-way power supply. One way serves as the main power supply circuit and enters the power cabinet 300 through the closed main circuit breaker 200. The other way serves as an exception circuit. After being transformed by the control power supply 400, it supplies power to the door switch interlock circuit 500, the industrial control computer, and other maintenance equipment to ensure the real-time monitoring of the door switch state by the door switch interlock circuit 500.

[0054] It should be understood that the processing details of the door switch interlock circuit in the embodiments of the present application can refer to Figure 1 - Figure 2 the relevant descriptions in the illustrated embodiments and related extended embodiments, and the embodiments of the present application will not be repeated here.

[0055] As Figure 4 shown, the embodiments of the present application also provide an ATE test system, including a power cabinet 600 and a test head 700. The power cabinet 600 is used to supply power to the test head 700;

[0056] Among them, the power cabinet 600 is provided with at least one-way door switch interlock circuit 610 for performing switch interlock control on the power cabinet; the test head 700 is provided with at least one-way door switch interlock circuit 710 for performing switch interlock control on the test head.

[0057] It should be understood that the processing details of the door switch interlock circuit in the embodiments of the present application can refer to Figure 1 - Figure 2 the relevant descriptions in the illustrated embodiments and related extended embodiments, and the embodiments of the present application will not be repeated here.

[0058] It should be noted that the embodiments described in the present application are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and illustrated in the drawings can be arranged and designed in various different configurations. Therefore, the above detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but only represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0059] The words "first, second, third", etc. in the specification and claims are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that, under the permitted circumstances, the specific order or sequence can be interchanged so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0060] In the above description, the labels indicating steps do not necessarily mean that the steps will be executed in this order. It may also include intermediate steps or be replaced by other steps. When permitted, the order of the front and back steps may be interchanged, or they may be executed simultaneously.

[0061] The term "comprising" as used in the specification and claims should not be construed as limited to the content listed thereafter; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the recited features, integers, steps or components, but not excluding the presence or addition of one or more other features, integers, steps or components and groups thereof. Thus, the statement "an apparatus comprising devices A and B" should not be limited to an apparatus consisting only of components A and B.

[0062] As used herein, the term "one embodiment" or "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the phrases "in one embodiment" or "in an embodiment" that appear throughout this specification do not necessarily all refer to the same embodiment, but may. Additionally, in various embodiments of the present application, if there is no special indication or logical conflict, the terms and / or descriptions between different embodiments are consistent and may be cross-referenced. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0063] Note that the above is only a preferred embodiment of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the concept of the present application, more other equivalent embodiments can be included, all of which fall within the scope of protection of the present application.

Claims

1. A door switch interlocking circuit, characterized in that: It includes at least one door switch connected in series between the control power supply and the control end of the main circuit breaker, and the main circuit breaker is controlled by the door switch interlocking, and both ends of each door switch are connected to a door switch monitoring circuit; The gate switch monitoring circuit includes a first resistor, a second resistor and a photocoupler, wherein the first resistor and two input ends of the photocoupler are connected in series between two ends of the gate switch, and the second resistor and two output ends of the photocoupler are connected in series between a pull-up power supply and a ground terminal in sequence; It also includes a microprocessor, which is respectively connected to the connection node of the second resistor in each door switch monitoring circuit and the output end of the photocoupler, and is used to detect the state of the door switch corresponding to the door switch monitoring circuit according to the received signal.

2. The circuit according to claim 1, characterized in that The gate switch monitoring circuit also includes a reverse diode connected between two input terminals of the photocoupler.

3. The circuit according to claim 1, characterized in that The control end of the main circuit breaker includes a pressure loss tripping coil of the main circuit breaker. When all door switches are closed, the pressure loss tripping coil is energized and the main circuit breaker is closed. When any door switch is disconnected, the pressure loss tripping coil loses power and the main circuit breaker is disconnected.

4. The circuit according to claim 1, characterized in that The microprocessor is connected to the connection node of the second resistor and the output end of the photocoupler in each door switch monitoring circuit, and performs state detection on each door switch according to the following method; When all the door switches are closed, the photoelectric couplers in the door switch monitoring circuit corresponding to each door switch are in an off state, and the pull-up power supply outputs a high-level signal to the microprocessor through the second resistor; When any one of the door switches is disconnected, the photoelectric coupler in the door switch monitoring circuit corresponding to the disconnected door switch is turned on, and the pull-up power supply outputs a low level signal to the microprocessor through the second resistor.

5. The circuit according to claim 1 or 3, characterized in that: The first resistor is a current limiting resistor, which is used to limit the current of the control power supply after the door switch is turned off.

6. The circuit according to claim 1, characterized in that The microprocessor includes an MCU chip, which is used to receive the signal output by the photoelectric coupler through the I / O interface and upload the processed state information of the door switch to the peripheral device.

7. The circuit according to any one of claims 1 to 6, characterized in that: The type of the door switch includes at least one of the following: Non-contact proximity switch or grating switch, contact limit switch or micro switch.

8. A power distribution system, characterized in that: It comprises a power supply, a control power supply, a main circuit breaker, a power supply cabinet and a door switch interlocking circuit as claimed in any one of claims 1 to 7, wherein the power supply of the power supply enters the power supply cabinet through the main circuit breaker that is pulled in; The door switch interlocking circuit is connected between the control power supply and the control end of the main circuit breaker, and is used for interlocking control of the main circuit breaker and monitoring the state of the door switch.

9. The system according to claim 8, characterized in that The control power supply is connected to the power supply; The power supply of the first power supply circuit of the power supply enters the power supply cabinet through the energized main circuit breaker, and the power supply of the second power supply circuit of the power supply enters the door switch interlocking circuit after being transformed by the control power supply.

10. An ATE test system, characterized in that: It includes a power cabinet and a test head, wherein the power cabinet is used to supply power to the test head; The power supply cabinet is provided with at least one door switch interlocking circuit according to any one of claims 1 to 7, for performing switch interlocking control on the power supply cabinet; The test head is provided with at least one door switch interlocking circuit according to any one of claims 1 to 7, for performing switch interlocking control on the test head.

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