Surface thermal ionization ion source power sample belt burnout alarm signal isolation device

Abstract

The utility model provides a burnout alarm signal isolation device for a surface thermal ionization ion source power source sample belt, and relates to the technical field of ion source power sources. The device comprises a detection circuit, an alarm circuit and an optical fiber. The detection circuit comprises a detection assembly and an infrared transmitting tube, the input end of the detection assembly is used for being connected with the sample belt interface, and the output end of the detection assembly is connected with the infrared transmitting tube; the alarm circuit comprises an infrared receiving tube and an alarm assembly, the infrared receiving tube is connected with the input end of the alarm assembly, and the output end of the alarm assembly is used for being connected with an upper computer; the two ends of the optical fiber are located in the light-emitting area of the infrared transmitting tube and the light-sensing area of the infrared receiving tube respectively. The abnormal condition is transmitted from the high-voltage side to the low-voltage side through the optical fiber, and the alarm circuit sends an alarm signal to the upper computer, so that the upper computer receives the signal of the low-voltage side, the upper computer cannot be damaged, and the upper computer can operate normally.

Description

Technical Field

[0001] This utility model relates to the field of ion source power technology, and more specifically, to an isolation device for an alarm signal of burnout of a surface thermal ionization ion source power supply sample. Background Technology

[0002] The main function of an ion source power supply is to apply a specific current to the sample strip, heating it to a high temperature of thousands of degrees Celsius. The material coated on the sample strip is ionized by the high temperature, releasing ions.

[0003] Due to defects in the sample strip processing, excessive heating time, excessive heating current, etc., the sample strip may burn out. When the sample strip is burned out, the detection circuit will detect this situation and issue a burnout alarm signal, which will be forwarded to the host computer software for processing.

[0004] However, the surface thermal ionization source power supply and the sample strip are equipped with a 10KV DC voltage, and the sample strip burnout detection circuit is also equipped with a 10KV high voltage. The alarm signal is transmitted to the alarm signal receiver (e.g., the host computer), but the alarm signal receiver usually cannot withstand the 10KV high voltage, which will cause the alarm signal receiver to burn out or greatly reduce its service life. Utility Model Content

[0005] The problem this invention aims to solve is that the existing method of directly transmitting the sample strip burnout alarm signal from the ion source power supply's operation detection circuit to the alarm signal receiver will cause the alarm signal receiver to burn out or greatly reduce its service life.

[0006] To address the aforementioned issues, this invention provides a surface thermal ionization ion source power strip burnout alarm signal isolation device, comprising a detection circuit, an alarm circuit, and an optical fiber;

[0007] The detection circuit includes a detection component and an infrared emitting tube. The input terminal of the detection component is connected to the sample strip interface, and the output terminal of the detection component is connected to the infrared emitting tube.

[0008] The alarm circuit includes an infrared receiver and an alarm component. The infrared receiver is connected to the input terminal of the alarm component, and the output terminal of the alarm component is used to connect to a host computer.

[0009] The two ends of the optical fiber are located in the light-emitting area of ​​the infrared emitting tube and the photosensitive area of ​​the infrared receiving tube, respectively.

[0010] Optionally, the detection component includes a first comparator, a Zener diode, a first resistor, a second resistor, and a fourth resistor;

[0011] One end of the fourth resistor is connected to the sample tape interface and the negative pin of the first comparator, and the other end of the fourth resistor is grounded; one end of the first resistor and one end of the second resistor are both connected to the positive terminal of the power supply; the other end of the first resistor is connected to the negative terminal of the Zener diode and the positive pin of the first comparator, and the positive terminal of the Zener diode is grounded; the other end of the second resistor is connected to the positive terminal of the infrared emitting diode, and the negative terminal of the infrared emitting diode is connected to the output terminal of the first comparator.

[0012] Optionally, the stable voltage of the Zener diode is greater than the voltage at one end of the fourth resistor when the sample strip is operating normally.

[0013] Optionally, the voltage at the sample strip voltage detection point is 6V, and the voltage stabilizing voltage of the Zener diode is 6.8V.

[0014] Optionally, the alarm component includes a second comparator, a fifth resistor, a sixth resistor, and an eighth resistor;

[0015] The negative terminal of the infrared receiver and one end of the sixth resistor are both connected to the driving power supply on the low-voltage side. The positive terminal of the infrared receiver is connected to one end of the fifth resistor and the negative terminal of the second comparator, respectively. The other end of the fifth resistor is grounded. The other end of the sixth resistor is connected to the positive terminal of the second comparator and one end of the eighth resistor, respectively. The other end of the eighth resistor is grounded. The output terminal of the second comparator is connected to the receiving terminal.

[0016] Optionally, when the infrared receiver is turned on, the voltage across the fifth resistor is greater than the voltage across the eighth resistor.

[0017] Optionally, the fifth resistor has a resistance of 51KΩ, the sixth resistor has a resistance of 10KΩ, and the eighth resistor has a resistance of 1KΩ.

[0018] Optionally, the alarm component further includes a seventh resistor, one end of which is connected to the driving power supply on the low-voltage side, and the other end of which is connected to the output of the second comparator.

[0019] Optionally, the alarm component further includes a first capacitor, one end of which is connected to the positive pin of the second comparator, and the other end of which is grounded.

[0020] This invention provides an isolation device for the alarm signal of a surface thermal ionization source power strip burnout. Compared with the prior art, it has the following advantages:

[0021] The detection circuit is connected to the sample tape interface in the sample tape power supply circuit. A sample tape is installed at the sample tape interface. The detection circuit is used to detect the working voltage of the sample tape. When the detection circuit detects that the sample tape is burned out and an abnormality occurs, the infrared emitting tube lights up. Through the transmission of the optical fiber, the infrared receiving tube is lit up, thereby transmitting the detected abnormality from the high-voltage side where the infrared emitting tube is located to the low-voltage side where the infrared receiving tube is located. The alarm component in the alarm circuit sends the signal generated by the lit infrared receiving tube to the host computer, so that the host computer receives the signal from the low-voltage side without causing damage to the host computer, allowing the host computer to operate normally. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a surface thermal ionization ion source power strip burnout alarm signal isolation device provided for an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of a constant current source control circuit provided in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figure 1 As shown, the sample tape power supply circuit includes a transistor N1 and a third resistor R3. The collector of transistor N1 is connected to the positive terminal of the power supply, and the emitter of transistor N1 is connected to the sample tape interface J1. The sample tape is installed at the sample tape interface J1. One end of the third resistor R3 is connected to the sample tape interface J1, and the other end of the third resistor R3 is grounded. The base of transistor N1 is connected to the constant current source control circuit.

[0028] like Figure 1 As shown in the embodiment of this application, a surface thermal ionization ion source power strip burnout alarm signal isolation device includes a detection circuit, an alarm circuit, and an optical fiber;

[0029] The detection circuit includes a detection component and an infrared emitting tube LED1 (which may be an infrared emitting diode). The input terminal of the detection component is used to connect to the sample tape interface, and the output terminal of the detection component is connected to the infrared emitting tube LED1.

[0030] The alarm circuit includes an infrared emitting diode LED2 (which may be an infrared receiving diode) and an alarm component. The infrared emitting diode LED2 is connected to the input terminal of the alarm component, and the output terminal of the alarm component is used to connect to a host computer.

[0031] The two ends of the optical fiber are located in the light-emitting area of ​​infrared LED1 and the light-sensitive area of ​​infrared LED2, respectively.

[0032] In this embodiment, the detection circuit is connected to the sample tape interface in the sample tape power supply circuit. A sample tape is installed at the sample tape interface. The detection circuit is used to detect the working voltage of the sample tape. When the detection circuit detects that the sample tape is burned out and an abnormality occurs, the infrared emitting tube LED1 lights up. Through the transmission of the optical fiber, the infrared emitting tube LED2 is lit up, thereby transmitting the detected abnormality from the high-voltage side where the infrared emitting tube LED1 is located to the low-voltage side where the infrared emitting tube LED2 is located. The alarm component in the alarm circuit sends the signal generated by the lit infrared emitting tube LED2 to the host computer, so that the host computer receives the signal from the low-voltage side without causing damage to the host computer, allowing the host computer to operate normally.

[0033] In optional embodiments of this application, such as Figure 1 As shown, the detection component includes a first comparator U1, a Zener diode Z1, a first resistor R1, a second resistor R2, and a fourth resistor R4;

[0034] One end of the fourth resistor R4 is connected to the sample tape interface and the negative pin of the first comparator U1, and the other end of the fourth resistor is grounded; one end of the first resistor R1 and one end of the second resistor R2 are both connected to the positive terminal of the power supply; the other end of the first resistor R1 is connected to the negative terminal of the Zener diode Z1 and the positive pin of the first comparator U1, and the positive terminal of the Zener diode Z1 is grounded; the other end of the second resistor R2 is connected to the positive terminal of the infrared emitting diode LED1, and the negative terminal of the infrared emitting diode LED1 is connected to the output terminal of the first comparator U1.

[0035] Specifically, the stable voltage of Zener diode Z1 is greater than the voltage across the fourth resistor R4 when the sample strip is operating normally. The voltage across the fourth resistor R4 is the voltage at the sample strip voltage detection point. For example, if the voltage at the sample strip voltage detection point is 6V, the stable voltage of Zener diode Z1 is 6.8V.

[0036] exist Figure 1 In the circuit, the first resistor R1 has a resistance of 2.2KΩ, the second resistor has a resistance of 1KΩ, and the fourth resistor has a resistance of 2.2KΩ. The maximum operating current of the sample strip is 6A, the voltage drop of the sample strip does not exceed 6V, and the voltage at the sample strip voltage detection point is 6V. Therefore, the alarm threshold is set slightly higher than 6V, at 6.8V. Thus, a Zener diode Z1 with a stable voltage of 6.8V is selected to achieve automatic monitoring of the voltage at the sample strip voltage detection point. The voltage at the positive pin of the first comparator U1 is 6.8V. The first comparator U1 monitors the voltage at the sample strip voltage detection point. When it is lower than 6.8V, the output is high, and the infrared emitting diode is cut off. When the sample strip burns out, the voltage at the sample strip voltage detection point is approximately 14.8V, which is greater than the reference voltage of 6.8V. The first comparator U1 outputs a low level, and the infrared emitting diode LED1 starts emitting infrared light. At this time, the abnormal situation of sample strip burnout is detected by the detection circuit and reflected in the infrared emitting diode LED1 lighting up.

[0037] In optional embodiments of this application, such as Figure 1 As shown, the alarm component includes a second comparator U2, a fifth resistor R5, a sixth resistor R6, and an eighth resistor R8;

[0038] The negative terminal of the infrared LED2 and one end of the sixth resistor are both connected to the low-voltage side drive power supply. The positive terminal of the infrared LED2 is connected to one end of the fifth resistor R5 and the negative terminal of the second comparator U2, respectively. The other end of the fifth resistor R5 is grounded. The other end of the sixth resistor is connected to the positive terminal of the second comparator U2 and one end of the eighth resistor R8, respectively. The other end of the eighth resistor R8 is grounded. The output terminal of the second comparator U2 is connected to the receiving terminal.

[0039] Specifically, when the infrared emitting diode LED2 is turned on, the voltage across the fifth resistor R5 is greater than the voltage across the eighth resistor R8. Figure 1 In the diagram, the fifth resistor R5 can be chosen to have a resistance of 51KΩ, the sixth resistor R6 can have a resistance of 10KΩ, and the eighth resistor R8 can have a resistance of 1KΩ. In practice, a 15cm long plastic optical fiber can be used for signal transmission. Assuming the infrared LED1 is an IR204, is a point light source with an emission current of 10mA, is 2mm away from the optical fiber, has a fiber length of 150mm, and a fiber transmission efficiency of 50%, then... Figure 1In the diagram, the voltage drop of infrared LED1 is 3V, and R2 = 1KΩ, so the emission current is 12mA. From the table, the radiated power of infrared LED1 (IR204) is 12mW / sr. Therefore, the power reaching infrared LED2 is E = 12 * 50% = 6mW / sr. The light energy Ee = radiated power / (distance) 2 = 6mW / sr / (1CM) 2 =6mW / cm 2 The infrared LED2 is selected as a PD204. According to the table, the dark current is 15μA when the light energy is 1.5mW / cm², and it will be even greater when the light energy is 6mW / cm². Since the resistance of the fifth resistor R5 is 51KΩ, the voltage at the negative pin of the second comparator U2 is greater than 0.5V. Since the resistance of the sixth resistor R6 is 10KΩ and the resistance of the eighth resistor R8 is 1KΩ, the reference voltage at the positive pin of the second comparator U2 is approximately 0.5V. When infrared light is incident on the infrared LED2, the fifth resistor R5 carries the dark current, and the voltage increases with the increase of the incident energy. When the dark current is greater than 10μA (i.e., the light energy reaching the infrared LED2 is greater than 1mW / cm²), the dark current increases. 2 When the sample tape burns out, according to the above analysis, the light energy received by the infrared emitting diode LED2 is 6mW / cm². 2 Much greater than 1mW / cm 2 The threshold is set so that when the sample tape burns out, the second comparator U2 outputs a low level. The low level is sent to the host computer, and the signal voltage sent to the host computer is smaller, further reducing the damage to the host computer.

[0040] In this optional embodiment, after the detection circuit detects that the sample strip is burned out, it emits an infrared signal through the infrared emitting tube LED1. The infrared signal is transmitted to the infrared emitting tube LED2 through the optical fiber. The alarm circuit monitors whether it receives the infrared signal. If it detects that an infrared signal has been received, the alarm circuit determines that the sample strip is burned out. Otherwise, it considers the sample strip to be normal.

[0041] In optional embodiments of this application, such as Figure 1 As shown, the alarm component also includes a seventh resistor R7. One end of the seventh resistor R7 is connected to the low-voltage side drive power supply, and the other end is connected to the output terminal of the second comparator U2. Additionally, the alarm component includes a first capacitor C1. One end of the first capacitor C1 is connected to the positive pin of the second comparator U2, and the other end of the second capacitor C1 is grounded. The second capacitor C1 serves a filtering function.

[0042] Specifically, in Figure 1In this configuration, the resistance of the seventh resistor, R7, can be chosen to be 10KΩ. Connecting the output of the second comparator U2 to the low-voltage side power supply via the seventh resistor R7 limits the signal sent to the host computer when the second comparator U2 outputs a high level. The strength of the low-level signal can also be adjusted by changing the resistance of the seventh resistor R7. When the second comparator U2 outputs a low voltage, its output transmits a noticeable, small alarm signal to the host computer. The host computer can be a computer, with the alarm signal transmitted from the second comparator U2 output to the computer via a control board. Alternatively, the output of the second comparator U2 can be connected to a wireless transmission device, which then transmits the signal to the computer.

[0043] like Figure 2 As shown, the constant current source control circuit includes a ninth resistor R9, a rotary potentiometer R10, an eleventh resistor R11, a second capacitor C2, and a third comparator U3. The negative terminal of the third comparator U3 is connected to one end of the third resistor R3, and the positive terminal of the third comparator U3 is connected to the slider terminal of the rotary potentiometer R10. One end of the eleventh resistor R11 is connected to the base of the transistor N1, and the other end of the eleventh resistor R11 is connected to the output terminal of the third comparator U3. One end of the ninth resistor R9 is connected to the resistor terminal of the rotary potentiometer R10, and the other end of the ninth resistor R9 is connected to the positive terminal of the power supply. The slider terminal of the rotary potentiometer R10 is grounded. One end of the second capacitor C2 is connected to one end of the third resistor R3, and the other end of the second capacitor C2 is connected to the output terminal of the third comparator U3.

[0044] Specifically, +15V and -15V power supplies are applied to the drive terminals of the third comparator U3 to enable it to operate. In the rotary potentiometer, the sliding contact shaft drives the sliding contact to rotate, and the sliding contact contacts the resistor on the sliding arm, sliding along the resistor, thus changing the length of the resistor connected in the circuit. A sample tape is connected to the sample tape interface J1. Changing the resistance value of the rotary potentiometer R10 controls the current flowing through the sample tape. Changing the resistance value of the rotary potentiometer R10 actually changes the voltage value at the anode of the third comparator U3. If the cathode voltage of the third comparator U3 is lower than the anode voltage, the operational amplifier outputs a higher level, driving transistor N1 to conduct, connecting the power supply and the sample tape circuit, increasing the circuit output. At this time, the third resistor R3 reflects the current magnitude in the circuit containing the sample tape. As the circuit containing the sample tape becomes connected, its voltage increases accordingly. When it increases to a value close to the anode voltage of the third comparator U3, the input voltage at the negative pin of the third comparator U3 stabilizes. Since the negative voltage of the third comparator U3 follows the positive voltage of the third comparator U3, and the resistance of the third resistor R3 and the negative voltage of the third comparator U3 remain constant, the current through the third resistor R3 remains constant regardless of changes in the external sample load connected to the sample interface J1. To change the current in the sample, the resistance of the rotary potentiometer R10 connected to the circuit can be changed using a stepper motor, thereby changing the voltage at the positive terminal of the third comparator U3, which in turn changes the negative voltage of the third comparator U3, thus changing the current through the third resistor R3, and consequently changing the current in the sample.

[0045] To reduce the current in the circuit, a ninth resistor R9 is added. Even when the resistance of the rotary potentiometer R10 is zero, the current in the circuit containing the positive terminal of the third comparator U3 will not be excessive. An eleventh resistor R11 is added to reduce the current at the base of the transistor, preventing excessive current from damaging transistor N1. A second capacitor C2 is connected between the output and negative terminals of the third comparator U3. After C2 is fully charged, the high-level voltage at the output of the third comparator U3 is equal to the input voltage at the negative terminal, making the output voltage controllable and preventing excessive current at the base of transistor N1. When power is off, the second capacitor C2 slowly discharges, gradually reducing the current at the base of transistor N1, causing transistor N1 to gradually turn off and reducing the impact of current surges.

[0046] exist Figure 1 and Figure 2 Although the voltage connected to the collector of transistor N1, the first resistor R1, the second resistor R2, and the ninth resistor R9 is marked as 15V, this 15V reference zero potential (i.e. Figure 1If a 10KV high voltage is applied to the grounding point on the medium-high voltage side, it can be understood that the reference point is 10KV and the relative potential of 15V is actually 10.015KV.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A surface thermal ionization ion source power strip burnout alarm signal isolation device, characterized in that, Includes detection circuits, alarm circuits, and optical fibers; The detection circuit includes a detection component and an infrared emitting tube. The input terminal of the detection component is connected to the sample strip interface, and the output terminal of the detection component is connected to the infrared emitting tube. The alarm circuit includes an infrared receiver and an alarm component. The infrared receiver is connected to the input terminal of the alarm component, and the output terminal of the alarm component is used to connect to a host computer. The two ends of the optical fiber are located in the light-emitting area of ​​the infrared emitting tube and the photosensitive area of ​​the infrared receiving tube, respectively.

2. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 1, characterized in that, The detection component includes a first comparator, a Zener diode, a first resistor, a second resistor, and a fourth resistor; One end of the fourth resistor is connected to the sample tape interface and the negative pin of the first comparator, and the other end of the fourth resistor is grounded; one end of the first resistor and one end of the second resistor are both connected to the positive terminal of the power supply; the other end of the first resistor is connected to the negative terminal of the Zener diode and the positive pin of the first comparator, and the positive terminal of the Zener diode is grounded; the other end of the second resistor is connected to the positive terminal of the infrared emitting diode, and the negative terminal of the infrared emitting diode is connected to the output terminal of the first comparator.

3. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 2, characterized in that, The stable voltage of the Zener diode is greater than the voltage at one end of the fourth resistor when the sample strip is working normally.

4. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 3, characterized in that, The voltage at the sample strip voltage detection point is 6V, and the voltage stabilizing voltage of the Zener diode is 6.8V.

5. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 1, characterized in that, The alarm component includes a second comparator, a fifth resistor, a sixth resistor, and an eighth resistor; The negative terminal of the infrared receiver and one end of the sixth resistor are both connected to the driving power supply on the low-voltage side. The positive terminal of the infrared receiver is connected to one end of the fifth resistor and the negative terminal of the second comparator, respectively. The other end of the fifth resistor is grounded. The other end of the sixth resistor is connected to the positive terminal of the second comparator and one end of the eighth resistor, respectively. The other end of the eighth resistor is grounded. The output terminal of the second comparator is connected to the receiving terminal.

6. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 5, characterized in that, When the infrared receiver is turned on, the voltage across the fifth resistor is greater than the voltage across the eighth resistor.

7. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 5, characterized in that, The fifth resistor has a resistance of 51KΩ, the sixth resistor has a resistance of 10KΩ, and the eighth resistor has a resistance of 1KΩ.

8. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 5, characterized in that, The alarm component also includes a seventh resistor, one end of which is connected to the driving power supply on the low-voltage side, and the other end of which is connected to the output of the second comparator.

9. The surface thermal ionization ion source power strip burnout alarm signal isolation device as described in claim 5, characterized in that, The alarm component also includes a first capacitor, one end of which is connected to the positive pin of the second comparator, and the other end of which is grounded.

Images