Load in position detection device and ion pump power supply system

Abstract

The application relates to a load-in-place detection device and an ion pump power supply system. The load-in-place detection device comprises a cable unit for connecting a load and a power supply, and a potential detection circuit provided with a detection point connected with a ground terminal of at least one of the load and the power supply through the cable unit, the potential detection circuit being used for detecting a disconnection state of the cable unit by detecting a potential of the detection point; wherein the detection point presents a low potential in a normal working state; when the cable unit is disconnected with at least one of the load and the power supply, the potential detection circuit configures a potential of the detection point as a high potential, the high potential being greater than the low potential. In the judgment process, the working current size of the load does not need to be relied on, and even in the case that the working current of the load is extremely small or even zero, the in-place condition of the load can still be accurately detected.

Description

Technical Field

[0001] This invention relates to the field of power supply detection technology, and in particular to a load in-situ detection device and an ion pump power supply system. Background Technology

[0002] When a power supply is supplying power to a load, the connection between the power supply and the load is often broken for various reasons, which can easily damage the device over time. Traditional load presence detection devices determine the load presence by detecting the magnitude of the load current, but the detection results become inaccurate when the load current is extremely small. Summary of the Invention

[0003] Therefore, it is necessary to provide a load presence detection device and an ion pump power supply system to address the problem that traditional load presence detection devices cannot accurately detect the load presence when the load current is extremely small.

[0004] A load presence detection device includes: a cable unit for connecting a load and a power supply; and a potential detection circuit with a detection point, wherein the detection point is connected to a ground terminal of at least one of the load and the power supply via the cable unit, and the potential detection circuit is used to detect the disconnection state of the cable unit by detecting the potential of the detection point; wherein the detection point presents a low potential under normal operating conditions; when the cable unit is disconnected from at least one of the load and the power supply, the potential detection circuit configures the potential of the detection point to a high potential, wherein the high potential is greater than the low potential.

[0005] In one embodiment, the cable unit includes a power line, an in-situ detection line, and a connector. The connector is located at both ends of the power line, and the two ends of the power line are respectively connected to the power source and the load through the connector. The power source supplies power to the load, and the in-situ detection line is connected to the grounding terminal through the connector.

[0006] In one embodiment, the presence detection line includes a power supply presence detection line and a load presence detection line. The power supply presence detection line is connected to the ground terminal of the power supply through the connector, and the load presence detection line is connected to the ground terminal of the load through the connector.

[0007] In one embodiment, the potential detection circuit includes a first potential detection circuit and a second potential detection circuit. Each of the first potential detection circuit and the second potential detection circuit has a detection point. The detection point in the first potential detection circuit is connected to the ground terminal of the power supply through the power supply in-situ detection line, and the detection point in the second potential detection circuit is connected to the ground terminal of the load through the load in-situ detection line.

[0008] In one embodiment, at least one of the power supply presence detection line and the load presence detection line is present at any length location of the power supply line.

[0009] In one embodiment, the cable unit further includes a protective layer, the power lines between the connectors are covered inside the protective layer, and the in-situ detection lines are partially or completely covered inside the protective layer.

[0010] In one embodiment, the cable unit includes: a power cord; a first connector disposed at one end of the power cord for connection to the power source; a second connector disposed at the other end of the power cord for connection to the load, wherein the power source supplies power to the load; and an in-situ detection line, one end of which is connected to the ground terminal of the power source via the first connector, and the other end of which is connected to the potential detection circuit via the second connector; or one end of which is connected to the ground terminal of the load via the second connector, and the other end of which is connected to the potential detection circuit via the first connector; wherein the in-situ detection line is present at any length of the power cord.

[0011] In one embodiment, the potential detection circuit includes a first voltage divider unit and a second voltage divider unit connected in series between a preset voltage and a second ground terminal, and the detection point is located between the first voltage divider unit and the second voltage divider unit.

[0012] In one embodiment, the resistance of the first voltage divider unit is less than the resistance of the second voltage divider unit.

[0013] An ion pump power supply system includes a power supply and a load presence detection device as described above, wherein the load is an ion pump and the power supply is an ion pump power supply.

[0014] In one embodiment, the load presence detection device is located inside the ion pump power supply.

[0015] In one embodiment, a control unit is also included, which is connected to the ion pump power supply and the potential detection circuit. The control unit is used to control the ion pump power supply to disconnect and trigger an alarm when the potential detection circuit detects that the cable unit is disconnected.

[0016] The aforementioned load presence detection device and ion pump power supply system include a cable unit and a potential detection circuit. The potential detection circuit has a detection point for detecting the disconnection state of the cable unit by detecting the potential of the detection point. The detection point is connected to the grounding terminal of at least one of the load and the power supply through the cable unit, so that the detection point presents a low potential under normal operating conditions. When the cable unit is disconnected from at least one of the load and the power supply, the potential detection circuit configures the potential of the detection point to a high potential. By detecting the potential of the detection point, the disconnection state of the cable unit can be determined, that is, whether the load is present. In the judgment process, it is not necessary to rely on the magnitude of the load's operating current. Even when the load's operating current is extremely small or even zero, the presence of the load can still be accurately detected. Attached Figure Description

[0017] Figure 1 This is a structural block diagram of a load presence detection device in one embodiment.

[0018] Figure 2 This is a schematic diagram of the internal structure of a cable unit in one embodiment.

[0019] Figure 3 This is an enlarged internal schematic diagram of the connector in one embodiment.

[0020] Figure 4 This is a schematic diagram showing the connection between the cable unit and the ion pump power supply and the ion pump in one embodiment.

[0021] Figure 5 This is a circuit diagram of a potential detection circuit in one embodiment.

[0022] Figure 6 This is a schematic diagram showing the connection between the cable unit and the ion pump power supply and the ion pump in another embodiment.

[0023] Figure 7 This is a schematic diagram showing the connection between the cable unit and the ion pump power supply and the ion pump in another embodiment. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] To address the inability of traditional load presence detection devices to accurately detect load presence when the load current is extremely low, this application provides a load presence detection device. For example, in medical radiotherapy equipment, ion pumps are used to maintain the vacuum state of the accelerator tube. An ion pump is a vacuum pump that ionizes air into ions under high pressure, which are then absorbed. The ion pump requires an external high voltage of approximately 5KV to operate. It generates milliampere-level currents in environments with poor vacuum, but its operating current is almost zero in environments with good vacuum. In complex medical systems, frequent gantry movement or human error can cause the cable between the ion pump power supply and the ion pump to break, rendering the ion pump inoperable and potentially damaging the accelerator tube. Therefore, to solve the problem of cable breakage preventing the ion pump from evacuating the accelerator tube and causing damage, a load presence detection device is needed that can accurately detect the ion pump's presence even with extremely low load current. The following is a detailed description of the load presence detection device applied to detect the presence status of an ion pump. It should be noted that the load presence detection device provided in this application can detect the presence status of ion pumps, including but not limited to ion pumps, and can also be applied to other loads with low current or even zero current.

[0026] In one embodiment, such as Figure 1 As shown, a load presence detection device 10 includes a cable unit 110 and a potential detection circuit 120.

[0027] The cable unit 110 is used to connect the power supply and the load. In this embodiment, the power supply is an ion pump power supply 20 (also known as an IPPS), and the load is an ion pump 30. The ion pump power supply 20 can output a stable 5KV DC voltage, and due to the special operation of the ion pump 30, its operating current is a small current close to zero most of the time.

[0028] The potential detection circuit 120 is provided with a detection point. The potential detection circuit 120 is used to detect the disconnection state of the cable unit 110 by detecting the potential of the detection point. The detection point is connected to the ground terminal (PE) of at least one of the ion pump power supply 20 and ion pump 30 via the cable unit 110, so that the detection point presents a low potential under normal operating conditions. When the cable unit 110 is disconnected from at least one of the ion pump power supply 20 and ion pump 30, the potential detection circuit 120 configures the potential of the detection point to a high potential. The low potential is the potential of the ground terminal of the ion pump power supply 20 or ion pump 30, and the high potential is greater than the low potential. The following explanation assumes that the potential of the ground terminal of the ion pump power supply 20 or ion pump 30 is zero.

[0029] Specifically, when the cable unit 110 is not disconnected, the detection point and the grounding terminal of the ion pump power supply 20 or ion pump 30 are at the same potential, and the detection point is at zero potential. When the cable unit 110 is disconnected, the potential of the detection point is controlled by the potential detection circuit 120 to be a potential greater than zero, so as to determine the disconnection state of the cable unit 110 by whether the potential of the detection point is zero. The presence detection device 10 does not depend on the operating current of the ion pump 30 to detect the disconnection state of the cable unit 110. Even if the operating current of the ion pump 30 is extremely small or even zero, it can still accurately detect the presence of the ion pump 30.

[0030] In one embodiment, such as Figure 2 As shown, the cable unit 110 includes a power cord 112, an in-situ detection line 114, and a connector 116. For example, the power cord 112 includes a high-voltage core capable of withstanding 5KV and an insulation layer and a shielding layer covering it. The insulation layer and shielding layer provide insulation, prevent partial discharge, and shield the electric field for the high-voltage core. The in-situ detection line 114 includes a conductor for electrical connection. Similarly, the in-situ detection line 114 may also include an insulation layer and a shielding layer covering the conductor to protect it.

[0031] Combined with appendix Figure 3 and attached Figure 4 Connector 116 is located at both ends of power line 112. The two ends of power line 112 are connected to ion pump power supply 20 and ion pump 30 respectively via connector 116. Ion pump power supply 20 supplies power to ion pump 30. When connector 116 is disconnected, power line 112 is also disconnected from ion pump power supply 20 or ion pump 30. Connector 116 includes a detection pin 1162, which is connected to in-situ detection line 114. When connector 116 is connected to ion pump 30, the detection pin 1162 within connector 116 is connected to the ground terminal of ion pump 30, and the in-situ detection line 114 is connected to the ground terminal of ion pump 30, introducing the potential of the ground terminal of ion pump 30 to the detection point. Similarly, when connector 116 is connected to ion pump power supply 20, the detection pin 1162 inside connector 116 is connected to the ground terminal of ion pump power supply 20. Therefore, the presence detection line 114 is connected to the ground terminal of ion pump power supply 20, and the presence detection line 114 introduces the potential of the ground terminal of ion pump power supply 20 to the detection point. It can be understood that when connector 116 is disconnected from ion pump 30, its internal power line 112 and presence detection line 114 will also disconnect from ion pump 30. Thus, the presence detection line 114 can detect whether the power line 112 is disconnected from ion pump 30. A similar situation occurs when connector 116 is disconnected from ion pump power supply 20, which will not be elaborated here.

[0032] The number of detection pins 1162 can be set as needed, but the number must be at least one. When there are multiple detection pins 1162, they are connected to the same in-situ detection line 114. When the connector 116 is disconnected, the detection pins 1162 are suspended, and the potential detection circuit 120 controls the potential of the detection point to be high. Multiple detection pins 1162 can ensure reliable connection between the detection point and the grounding terminal of the ion pump power supply 20 or ion pump 30, and the potential of the detection point is zero, even when the power line 112 is not disconnected. In other embodiments, the connector 116 also includes a metal housing 1164 on the outer layer, and a housing 119 can also be provided outside the connection point between the in-situ detection line 114 and the potential detection circuit 120 to facilitate connection. When applied to complex grounding systems, many devices need to be connected to the grounding terminal. By using the in-situ detection line 114 to connect to the detection point for detection, it is possible to avoid the situation where the detection point is still at zero potential when the cable unit 110 is disconnected due to contact with these devices, thus making it impossible to accurately detect the in-situ status of the ion pump 30.

[0033] In one embodiment, the in-situ detection line 114 includes a power supply in-situ detection line 1142 and a load in-situ detection line 1144. The power supply in-situ detection line 1142 is connected to the ground terminal of the ion pump power supply 20 via a detection pin 1162, and the load in-situ detection line 1144 is connected to the ground terminal of the ion pump 30 via a detection pin 1162. Figure 5 The potential detection circuit 120 includes a first potential detection circuit 122 and a second potential detection circuit 124. In this embodiment, the detection points include a first detection point T1 and a second detection point T2. The first potential detection circuit 122 has a first detection point T1, which is connected to the ground terminal of the ion pump power supply 20 through a power supply in-place detection line 1142. The second potential detection circuit 124 has a second detection point T2, which is connected to the ground terminal of the ion pump 30 through a load in-place detection line 1144. By detecting the potential at the first detection point T1, the potential detection circuit 120 detects whether the connector 116 at the ion pump power supply 20 is disconnected. Simultaneously, by detecting the potential at the second detection point T2, the potential detection circuit 120 detects whether the connector 116 at the ion pump 30 is disconnected, reducing troubleshooting time. Users can directly identify which connector 116 is disconnected, thus facilitating repair.

[0034] In one embodiment, at any length of the power cord 112, at least one of the power presence detection line 1142 and the load presence detection line 1144 is present. Specifically, the cable unit 110 also includes a protective layer 118. The power cord 112 is covered inside the protective layer 118, and the presence detection line 114 is partially or entirely located within the protective layer 118. The protective layer 118 may include an insulation layer and a shielding layer, which not only provides electrical protection for the power cord 112 and the presence detection line 114 inside, but also resists external abrasion, etc., and the covering of the protective layer 118 makes the cable unit 110 easier to store. The power cord 112 and the presence detection line 114 located inside the protective layer 118 can be intertwined or placed in parallel, etc.

[0035] The power line 112 between the two connectors 116 is located within the protective layer 118, and there is always a presence detection line 114 next to the power line 112 within the protective layer 118. This ensures that if the power line 112 between the two connectors 116 is disconnected, at least one of the power presence detection line 1142 and the load presence detection line 1144 will also disconnect. In other words, the load presence detection device 10 can detect not only the disconnection status at the connection point between the power line 112 and the ion pump 30 and the ion pump power supply 20, but also the disconnection status at any point on the power line 112 between the two connectors 116. This means the load presence detection device 10 can detect the disconnection status of the cable unit 110 at any location. Furthermore, a mark can be set on the outside of the protective layer 118 corresponding to the overlapping area of ​​the power presence detection line 1142 and the load presence detection line 1144. This allows the potential detection circuit 120 to determine that both connectors 116 are disconnected or the power line 112 is disconnected at the marked location when the potential detection circuit 120 detects that the potentials at both the first detection point T1 and the second detection point T2 are high.

[0036] In another embodiment, see Figure 6 The cable unit 110 includes a power line 112, an in-situ detection line 114, and a first connector 116a and a second connector 116b respectively disposed at both ends of the power line 112. The first connector 116a and the second connector 116b are used to connect to the ion pump power supply 20 and the ion pump 30, respectively, so that the ion pump power supply 20 supplies power to the ion pump 30. One end of the in-situ detection line 114 is connected to the ground terminal of the ion pump 30 through the first connector 116a, and the other end of the in-situ detection line 114 is connected to the potential detection circuit 120 through the second connector 116b. The in-situ detection line 114 is present at any length of the power line 112. This embodiment can detect the disconnection state of the first connector 116a, i.e., the disconnection state between the ion pump 30 and the cable unit 110, as well as the disconnection state of the power line 112 at any point between the first connector 116a and the second connector 116b.

[0037] In yet another embodiment, see Figure 7 The cable unit 110 includes a power line 112, an in-situ detection line 114, and a first connector 116a and a second connector 116b respectively disposed at both ends of the power line 112. The first connector 116a and the second connector 116b are respectively used to connect to the ion pump power supply 20 and the ion pump 30, so that the ion pump power supply 20 supplies power to the ion pump 30. One end of the in-situ detection line 114 is connected to the ground terminal of the ion pump power supply 20 through the first connector 116a, and the other end of the in-situ detection line 114 is connected to the potential detection circuit 120 through the second connector 116b. The in-situ detection line 114 exists at any length of the power line 112. This embodiment can detect the disconnection state of the first connector 116a, i.e., the disconnection state between the ion pump power supply 20 and the cable unit 110, as well as the disconnection state of the power line 112 at any point between the first connector 116a and the second connector 116b.

[0038] In one embodiment, see Figure 5 The potential detection circuit 120 includes a first voltage divider unit and a second voltage divider unit connected in series between the preset voltage and the second ground terminal. The detection point is between the first voltage divider unit and the second voltage divider unit. The resistance of the first voltage divider unit is less than the resistance of the second voltage divider unit.

[0039] For details, please see the appendix. Figure 5The first potential detection circuit 122 includes a first voltage divider unit and a second voltage divider unit. In this embodiment, the first voltage divider unit in the first potential detection circuit 122 is resistor R1, and the second voltage divider unit is resistor R3. The first channel (Channel 1) at the first detection point T1 is connected to the power supply presence detection line 1142. Similarly, the second potential detection circuit 124 includes a first voltage divider unit and a second voltage divider unit. In this embodiment, the first voltage divider unit in the second potential detection circuit 124 is resistor R2, and the second voltage divider unit is resistor R4. The second channel (Channel 2) at the second detection point T2 is connected to the load presence detection line 124. For example, the preset voltage (VCC) is 5V, the resistance values ​​of resistors R1 and R2 are both 1KΩ, and the resistance values ​​of resistors R3 and R4 are both 10KΩ. However, the values ​​of the preset voltage and the values ​​of resistors R1 to R4 are not limited to the data provided in this embodiment. In this embodiment, when the connector 116 at the ion pump power supply 20 is disconnected, the detection pin 1162 inside the connector 116 is suspended. Due to the voltage division effect of resistors R1 and R3, the potential of the first detection point T1 is greater than zero. When the connector 116 at the ion pump power supply 20 is not disconnected, the first detection point T1 is connected to the ground terminal of the ion pump power supply 20 through the power supply in-situ detection line 1142, and the potential of the first detection point T1 is zero. Similarly, when the connector 116 at the ion pump 30 is disconnected, the detection pin 1162 inside the connector 116 is suspended. Due to the voltage division effect of resistors R1 and R3, the potential of the second detection point T2 is greater than zero. When the connector 116 at the ion pump 30 is not disconnected, the second detection point T2 is connected to the ground terminal of the ion pump 30 through the load in-situ detection line 1144, and the potential of the second detection point T2 is zero. Since the ion pump 30 requires a high-voltage power supply of about 5KV, when the cable unit 110 is not disconnected, the potential of the detection point is zero, which is more convenient and safer than detecting a high voltage of several kilovolts.

[0040] This application also provides an ion pump power supply system, including a power supply and a load presence detection device 10 as described in any of the above embodiments. This ion pump power supply system, while supplying power to the ion pump 30, can also detect the disconnection state of any position on the cable unit 110 between the ion pump power supply 20 and the ion pump 30, including the disconnection state of the connectors 116 at both ends and the disconnection state of the power line 112 at any position between these two connectors 116. In this embodiment, see... Figure 3 The load in-place detection device 10 is located inside the ion pump power supply 20. The preset voltage in the potential detection circuit 120 and the second ground terminal are provided by the ion pump power supply 20, which simplifies the circuit structure.

[0041] In one embodiment, the ion pump power supply system further includes a control unit. The control unit is connected to the ion pump power supply 20 and to the potential detection circuit 120. The control unit is used to control the ion pump power supply 20 to disconnect and trigger an alarm when the potential detection circuit 120 detects that the cable unit 110 is disconnected. For example, the high-voltage module inside the ion pump power supply 20 has an enable pin. When the cable unit 110 is detected to be disconnected, the control unit pulls the enable pin low, thereby disconnecting the power output. The alarm may include an audible alarm, a visual alarm, or an information prompt alarm. This ion pump power supply system has high reliability, can promptly protect the ion pump 30 and the vacuum pump without causing damage to the vacuum pump, and is suitable for high-voltage power supply systems.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A load presence detection device, characterized in that, include: Cable unit used to connect the load and power supply; and A potential detection circuit is provided with a detection point, which is directly connected to the ground terminal of at least one of the load and the power supply through the cable unit. The potential detection circuit is used to detect the disconnection state of the cable unit by detecting the potential of the detection point. Wherein, the detection point presents a low potential under normal operating conditions; when the cable unit is disconnected from at least one of the load and the power supply, the potential detection circuit configures the potential of the detection point to a high potential, the high potential being greater than the low potential; the load is an ion pump, and the load-in-place detection device detects the disconnection state of the cable unit independently of the operating current of the ion pump; The cable unit includes a power line, an in-situ detection line, and a connector. The connector is located at both ends of the power line. The two ends of the power line are respectively connected to the power source and the ion pump through the connector. The power source supplies power to the ion pump. The in-situ detection line is connected to the grounding terminal through the connector. The in-situ detection line includes a load in-situ detection line, which is connected to the ground terminal of the ion pump through the detection pin of the connector; the potential detection circuit includes a second potential detection circuit, which has a detection point, and the detection point in the second potential detection circuit is connected to the ground terminal of the ion pump through the load in-situ detection line.

2. The apparatus according to claim 1, characterized in that, The in-situ detection line includes a power in-situ detection line, which is connected to the ground terminal of the power supply via the connector.

3. The apparatus according to claim 2, characterized in that, The potential detection circuit includes a first potential detection circuit, which has a detection point. The detection point in the first potential detection circuit is connected to the ground terminal of the power supply through the power supply presence detection line.

4. The apparatus according to claim 2, characterized in that, At any point along the length of the power line, there is at least one of the power supply presence detection line and the load presence detection line.

5. The apparatus according to claim 1, characterized in that, The cable unit further includes a protective layer, the power lines between the connectors are covered inside the protective layer, and the in-situ detection lines are partially or completely covered inside the protective layer.

6. The apparatus according to claim 1, characterized in that, The cable unit includes: Power cord; A first connector is disposed at one end of the power cord and is used to connect to the power source; A second connector, located at the other end of the power cord, is used to connect to the load, wherein the power supply provides power to the load; and An in-situ detection line has one end connected to the ground terminal of the power supply via the first connector, and the other end connected to the potential detection circuit via the second connector; or one end of the in-situ detection line is connected to the ground terminal of the load via the second connector, and the other end is connected to the potential detection circuit via the first connector. The in-situ detection line is present at any length of the power line.

7. The apparatus according to claim 1, characterized in that, The potential detection circuit includes a first voltage divider unit and a second voltage divider unit connected in series between a preset voltage and a second ground terminal, and the detection point is located between the first voltage divider unit and the second voltage divider unit.

8. The apparatus according to claim 7, characterized in that, The resistance of the first voltage divider unit is less than the resistance of the second voltage divider unit.

9. An ion pump power supply system, characterized in that, It includes a power supply and a load presence detection device as described in any one of claims 1 to 8, wherein the load is an ion pump and the power supply is an ion pump power supply.

10. The system according to claim 9, characterized in that, The load in-situ detection device is located inside the ion pump power supply.

11. The system according to claim 10, characterized in that, It also includes a control unit, which is connected to the ion pump power supply and the potential detection circuit. The control unit is used to control the ion pump power supply to disconnect and trigger an alarm when the potential detection circuit detects that the cable unit is disconnected.

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