Temperature monitoring circuit for multipath copper bar connection assembly and high-power AC power supply

Abstract

The utility model provides a temperature monitoring circuit used for a multipath copper bar connecting assembly and a high-power AC power supply in order to solve the problem that the risk of loosening of a copper bar assembly connecting bolt caused by repeated thermal expansion and cold contraction cannot be found in time in the prior art. The monitoring circuit comprises a temperature sampling sub-circuit, a two-stage DC voltage amplification sub-circuit and a V / A conversion output sub-circuit. Whether the copper bar connecting assembly is reliably connected or not is judged by analyzing the temperature change of the copper bar connecting assembly, in practical application, the alarm temperature of the copper bar connecting assembly can be set on the upper computer according to the field working condition, the copper bar connecting assembly is judged to be abnormal when the alarm temperature is exceeded, and corresponding processing is carried out in time. The temperature of the copper bar connecting assembly is correspondingly converted into a DC4-20mA low-voltage direct-current standard signal to be output through the embedded thermistor and the electric signal amplifying circuit, uninterrupted monitoring of the copper bar connecting assembly is achieved, and compared with a traditional manual intermittent regular inspection mode, the monitoring reliability is improved from the technical principle.

Description

Technical Field

[0001] This utility model relates to the field of electronic protection technology, and in particular to a temperature monitoring circuit and a high-power AC power supply for a multi-channel copper busbar connection assembly. Background Technology

[0002] In vacuum evaporation equipment, a high-power AC power supply is required. The high-power AC power supply has multiple outputs, which are led out through copper busbars. The current reaches thousands of amperes, and the output copper busbars are composed of multiple copper busbar components.

[0003] In existing technologies, copper busbar assemblies are rigidly connected using a large number of connecting bolts. During long-term operation, the continuous flow of high current will cause the copper busbar assembly to heat up. The connecting bolts are at risk of loosening due to repeated thermal expansion and contraction. Loose connecting bolts will increase the contact resistance at the connection point of the copper busbar assembly, and after long-term operation, local oxidation will occur, which will further cause abnormal equipment parameters. If it is not detected and eliminated in time, it will lead to abnormal equipment error reports or more malfunctions, affecting normal production. Utility Model Content

[0004] This invention addresses the problem in the prior art where the risk of loosening of connecting bolts in copper busbar assemblies due to repeated thermal expansion and contraction cannot be detected in a timely manner. It provides a temperature monitoring circuit and a high-power AC power supply for multi-channel copper busbar connection assemblies.

[0005] The technical solution adopted in this utility model is:

[0006] A temperature monitoring circuit for a multi-channel copper busbar connection assembly includes a temperature sampling sub-circuit, a two-stage DC voltage amplification sub-circuit, and a V / A conversion output sub-circuit, wherein:

[0007] The temperature sampling sub-circuit is connected to the copper busbar connection assembly and is used to collect the temperature of the copper busbar connection assembly and convert it into a DC voltage signal.

[0008] The two-stage DC voltage amplification sub-circuit is connected to the temperature sampling sub-circuit and is used to perform error elimination and two-stage amplification on the DC voltage signal;

[0009] The V / A conversion output sub-circuit is connected to the two-stage DC voltage amplification sub-circuit and is used to convert the amplified DC voltage signal into a 4-20mA DC current standard signal output.

[0010] Furthermore, the temperature sampling sub-circuit includes a thermistor RT and a voltage divider resistor R1;

[0011] The thermistor RT is connected in series with the voltage divider resistor R1, and an RC absorption circuit consisting of resistor R2 and capacitor C1 is connected in parallel across the thermistor RT. The resistor R2 and capacitor C1 are connected in series.

[0012] Furthermore, the two-stage DC voltage amplifier sub-circuit includes a first-stage DC voltage amplifier unit and a second-stage DC voltage amplifier unit;

[0013] The first stage DC voltage amplification unit includes a first resistor R5, a second resistor R4, a third resistor R7, a fourth resistor R3, a fifth resistor R6, a sixth resistor R8, a first potentiometer VR1, a second potentiometer VR2, and a first operational amplifier U1A.

[0014] In this circuit, one end of the first resistor R5 is connected in series with the output of the temperature sampling sub-circuit, and the other end is connected in parallel with the non-inverting input of the first operational amplifier U1A and one end of the fifth resistor R6. The other end of the fifth resistor R6 is connected to the variable input M of the second potentiometer VR2. The fixed input 3 of the second potentiometer VR2 is connected to the control power ground GND, and the fixed input 1 is connected in series with one end of the fourth resistor R3. The other end of the fourth resistor R3 is connected to the negative input P- of the control power supply. The inverting input of the first operational amplifier U1A is connected in parallel with one end of the second resistor R4 and the third resistor R7. The other end of the second resistor R4 is connected to the control power ground GND, and the other end of the third resistor R7 is connected in series with the fixed input 1 of the first potentiometer VR1. The fixed input 3 and the variable input M of the first potentiometer VR1 are connected in parallel with the output of the first operational amplifier U1A and one end of the sixth resistor R8.

[0015] Furthermore, the second-stage DC voltage amplification unit includes a seventh resistor R9, an eighth resistor R10, a ninth resistor R11, a Zener diode DW1, and a second operational amplifier U1B. Specifically, one end of the sixth resistor R8 in the first-stage DC voltage amplification unit is connected in parallel with the fixed terminal 3 and the variable terminal M of the first potentiometer VR1, and the other end is connected in series with the non-inverting terminal of the second operational amplifier U1B. The inverting terminal of the second operational amplifier U1B is connected in parallel with one end of the seventh resistor R9 and the eighth resistor R10. The other end of the seventh resistor R9 is connected to the control power ground GND. The output terminal of the second operational amplifier U1B is connected in parallel with the other end of the eighth resistor R10 and one end of the ninth resistor R11. The other end of the ninth resistor R11 is connected in parallel with the cathode of the Zener diode DW1 and the input terminal IN of the conversion module DM1. The anode of the Zener diode DW1 is connected to the control power ground GND.

[0016] Furthermore, the V / A conversion output sub-circuit is a conversion module DM1, which linearly converts the 0-5V DC voltage signal input from the two-stage DC voltage amplification sub-circuit into a 4-20mA DC current signal for output to the host computer.

[0017] Based on the same inventive concept, this utility model also provides a high-power AC power supply, which includes the aforementioned temperature monitoring circuit for multi-channel copper busbar connection components.

[0018] The beneficial effects of this utility model are:

[0019] In this invention, the reliability of the copper busbar connection is determined by analyzing the temperature changes of the connection components. In practical applications, an alarm temperature for the copper busbar connection components can be set on the host computer according to the on-site working conditions. When the alarm temperature is exceeded, it is determined that the copper busbar connection components are abnormal, and appropriate measures are taken in a timely manner. In addition, the temperature at the copper busbar connection components is converted into a DC 4-20mA low-voltage DC standard signal output through a pre-embedded thermistor and electrical signal amplification circuit, realizing uninterrupted monitoring of the copper busbar connection components. Compared with the traditional manual intermittent periodic inspection method, this improves the reliability of monitoring from a technical principle perspective. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a temperature monitoring circuit for a multi-channel copper busbar connection assembly provided in an embodiment of this utility model.

[0022] Figure 1 In the middle: 100—temperature sampling sub-circuit, 101—two-stage DC voltage amplification sub-circuit, 102—V / A conversion output sub-circuit. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0025] The embodiments of the utility model will now be described in detail with reference to the figures.

[0026] refer to Figure 1 This utility model embodiment provides a temperature monitoring circuit for a multi-channel copper busbar connection assembly, which mainly includes a temperature sampling sub-circuit 100, a two-stage DC voltage amplification sub-circuit 101, and a V / A conversion output sub-circuit 102, which are connected in series.

[0027] The temperature sampling sub-circuit 100 is used to collect the temperature of the copper busbar connection assembly. The collected electrical signal enters the two-stage DC voltage amplification sub-circuit 101 to perform error elimination and two-stage amplification of the temperature signal, and convert it into a 0-5V DC voltage signal. The V / A conversion output sub-circuit 102 includes a 0-5V / 4-20mA conversion module, which converts the 0-5V DC voltage signal of the two-stage DC voltage amplification sub-circuit 101 into a 4-20mA standard signal.

[0028] refer to Figure 1 The temperature sampling sub-circuit 100 specifically includes a thermistor RT. One end of the thermistor RT is connected to the control power ground GND, and the other end is connected to a voltage divider resistor R1. One end of the voltage divider resistor R1 is connected to the positive terminal P+ of the control power supply, and the other end is connected to a voltage divider resistor R1. The thermistor RT and the voltage divider resistor R1 are connected in series. A series RC absorption circuit composed of R2 and C1 is connected in parallel across the two ends of the thermistor RT. The function of this RC absorption circuit is to absorb external electrical signal interference.

[0029] When the device is working, the temperature sampling sub-circuit 100 described above converts the temperature of the copper busbar connection component into a weak DC voltage signal with a linear proportional relationship. This weak DC voltage signal is output to the next stage two-stage DC voltage amplification sub-circuit 101.

[0030] refer to Figure 1The aforementioned two-stage DC voltage amplification sub-circuit 101 specifically includes a first operational amplifier U1A and its peripheral circuitry connected to the output terminal of the aforementioned temperature sampling sub-circuit 100, and a second operational amplifier U1B connected in series with its peripheral circuitry; the non-inverting input of the first operational amplifier U1A is connected to the output terminal of the aforementioned temperature sampling sub-circuit 100. Further, the aforementioned circuit is a two-stage DC voltage amplification sub-circuit. The first-stage DC voltage amplification unit includes a first resistor R5, a second resistor R4, a third resistor R7, a fourth resistor R3, a fifth resistor R6, a sixth resistor R8, a first potentiometer VR1, a second potentiometer VR2, and a first operational amplifier U1A. One end of the first resistor R5 is connected in series with the output terminal of the temperature sampling sub-circuit 100, and the other end is connected in parallel with the non-inverting input of the first operational amplifier U1A and one end of the fifth resistor R6. The other end of the fifth resistor R6 is connected to the variable terminal M of the second potentiometer VR2. The fixed terminal 3 of the second potentiometer VR2 is connected to the control power ground GND, and the fixed terminal 1 is connected in series with one end of the fourth resistor R3. The other end of the fourth resistor R3 is connected to the negative terminal P- of the control power supply. The inverting input of the first operational amplifier U1A is connected in parallel with one end of the second resistor R4 and the third resistor R7. The other end of the second resistor R4 is connected to the control power ground GND, and the other end of the third resistor R7 is connected in series with the fixed terminal 1 of the first potentiometer VR1. The fixed terminal 3 and the variable terminal M of the first potentiometer VR1 are connected in parallel with the output terminal of the first operational amplifier U1A and one end of the sixth resistor R8. The second-stage DC voltage amplification unit includes the seventh resistor R9, the eighth resistor R10, the ninth resistor R11, the Zener diode DW1, and the second operational amplifier U1B. In the first-stage DC voltage amplification unit, one end of the sixth resistor R8 is connected in parallel with the fixed terminal 3 and the variable terminal M of the first potentiometer VR1 and the output terminal of the first operational amplifier U1A. The other end is connected in series with the non-inverting terminal of the second operational amplifier U1B. The inverting terminal of the second operational amplifier U1B is connected in parallel with one end of the seventh resistor R9 and the eighth resistor R10. The other end of the seventh resistor R9 is connected to the control power ground GND. The output terminal of the second operational amplifier U1B is connected in parallel with the other end of the eighth resistor R10 and one end of the ninth resistor R11. The other end of the ninth resistor R11 is connected in parallel with the cathode of the Zener diode DW1 and the input terminal IN of the conversion module DM1. The anode of the Zener diode DW1 is connected to the control power ground GND.

[0031] The aforementioned V / A conversion output sub-circuit 102 is a conversion module DM1, which linearly converts the 0-5V DC voltage signal input from the two-stage DC voltage amplification sub-circuit 101 into a 4-20mA DC current signal for output to the host computer.

[0032] The aforementioned two-stage DC voltage amplification sub-circuit 101 consists of a first operational amplifier U1A, a second operational amplifier U1B, and peripheral components. It performs error elimination and two-stage DC amplification on the input micro DC voltage signal. In the first-stage DC voltage amplification unit, the first resistor R5, the fourth resistor R3, the fifth resistor R6, and the second potentiometer VR2 form the input and error elimination circuit. The first resistor R5 is an isolation resistor connected in series with the output of the temperature sampling sub-circuit 100. The fourth resistor R3, the fifth resistor R6, and the second potentiometer VR2 form a negative voltage bias circuit. The second potentiometer VR2 adjusts the negative bias voltage amplitude. This negative bias voltage can increase the GND voltage value of the temperature sampling signal power supply, eliminating the background interference voltage signal from the temperature sampling sub-circuit 100. After ANDing with the DC voltage signal from the first resistor R5, the signal is sent to the non-inverting input of the first operational amplifier U1A. The second resistor R4, the third resistor R7, and the first potentiometer VR1, connected across the inverting input and output of the first operational amplifier U1A, form a proportional amplification circuit to moderately amplify the small DC voltage signal at the non-inverting input. The first potentiometer VR1 adjusts the proportional amplification factor. In the second-stage DC voltage amplification unit, the sixth resistor R8 is an isolation resistor that receives the voltage signal from the first-stage DC voltage amplification unit. The eighth resistor R10 and the seventh resistor R9, connected across the inverting input and output of the second operational amplifier U1B, form a proportional amplification circuit to proportionally amplify the voltage signal from the first-stage DC voltage amplification unit. Changing the value of the eighth resistor R10 adjusts the amplification factor. The ninth resistor R11 is an isolation resistor, and the Zener diode DW1 is an output limiting protection diode, limiting the output amplitude of the two-stage DC voltage amplification sub-circuit 101 to no more than 5V.

[0033] refer to Figure 1 The V / A conversion output sub-circuit 102 described above linearly converts the 0-5V DC voltage signal output by the two-stage DC voltage amplification sub-circuit 101 into a 4-20mA DC current standard signal output.

[0034] The above description is an explanation of the temperature monitoring circuit of the single-channel copper busbar connection component. In actual multi-channel applications, it is necessary to calibrate the VR1 and VR2 potentiometers of each channel and simulate the linearity of multiple temperature segments to ensure that the accuracy and linearity of the output signal are within 2% error.

[0035] The temperature monitoring circuit for a multi-channel copper busbar connection assembly provided in this embodiment has the following advantages:

[0036] Real-time monitoring and early warning: It can monitor the temperature changes of the copper busbar connection components in real time and convert the temperature signal into a standard electrical signal output. Users can set alarm temperatures on the host computer. Once the temperature exceeds the limit, an early warning will be issued immediately to detect abnormal heating of the copper busbar connection components in a timely manner and avoid equipment failure or production accidents caused by excessive temperature.

[0037] Improved monitoring reliability: By employing pre-embedded thermistors and electrical signal amplification circuits, the temperature signal is converted into a DC 4-20mA low-voltage DC standard signal output, enabling uninterrupted monitoring of the copper busbar connection components. Compared with traditional manual periodic inspections, this method significantly improves the reliability and continuity of monitoring from a technical perspective, ensuring the safety of the equipment during long-term operation.

[0038] Precise signal conversion and transmission: The weak temperature signal is amplified and error-eliminating through a two-stage DC voltage amplifier circuit, and finally converted into a standard 4-20mA DC current signal output. This signal conversion method not only improves the signal transmission distance and anti-interference capability, but also ensures the signal accuracy and linearity, facilitating precise data analysis and processing by the host computer.

[0039] Strong anti-interference capability: An RC absorption circuit is added to the temperature sampling sub-circuit, which can effectively absorb external electrical signal interference and ensure accurate temperature signal acquisition. In addition, the overall circuit design takes into account electromagnetic interference factors in industrial environments. Through reasonable layout and component selection, the circuit's anti-interference performance is further enhanced, ensuring stable operation in complex electromagnetic environments.

[0040] Easy to expand and integrate: This temperature monitoring circuit can be easily expanded into multi-channel applications. By calibrating the potentiometers of each channel and simulating the linearity of multiple temperature segments, it can meet the monitoring needs of equipment of different sizes. At the same time, its standard signal output format is easy to integrate with existing automated control systems and host computer software, enabling centralized monitoring and management and improving the overall intelligence level of the equipment.

[0041] Low maintenance costs: Automated monitoring of the temperature of copper busbar connection components reduces the workload and frequency of manual inspections, thereby lowering labor costs. Simultaneously, it allows for the timely detection and handling of potential faults, preventing production stoppages and increased maintenance costs due to equipment failures, thus improving equipment operating efficiency and economic benefits.

[0042] Highly adaptable: Suitable for temperature monitoring of multi-channel copper busbar connection components in various high-power AC power supply equipment, it performs well in vacuum evaporation equipment and other similar industrial equipment. Its flexible circuit design and parameter adjustment capabilities allow it to adapt to the working environment and temperature range requirements of different equipment.

[0043] Based on the same inventive concept, this embodiment also provides a high-power AC power supply, which includes the aforementioned temperature monitoring circuit for multi-channel copper busbar connection components.

Claims

1. A temperature monitoring circuit for a multi-way copper bar connection assembly, comprising a temperature sensing sub-circuit (100), a two-stage DC voltage amplification sub-circuit (101) and a V / A conversion output sub-circuit (102), characterized in that, Wherein: The temperature acquisition sub-circuit (100) is connected with the copper bar connection assembly, and is used for collecting the temperature of the copper bar connection assembly and converting the temperature into a direct current voltage signal; The two-stage direct current voltage amplification sub-circuit (101) is connected with the temperature acquisition sub-circuit (100), and is used for error elimination and two-stage amplification of the direct current voltage signal; The V / A conversion output sub-circuit (102) is connected with the two-stage direct current voltage amplification sub-circuit (101), and is used for converting the amplified direct current voltage signal into a 4-20mA direct current standard signal output.

2. The temperature monitoring circuit for a multi-way copper busbar connection assembly of claim 1, wherein, The temperature acquisition sub-circuit (100) comprises a thermistor RT and a voltage dividing resistor R1; Wherein, the thermistor RT is connected with the voltage dividing resistor R1 in series, and an RC absorption circuit composed of a resistor R2 and a capacitor C1 is connected with the thermistor RT in parallel, wherein the resistor R2 and the capacitor C1 are connected in series.

3. The temperature monitoring circuit for the multi-path copper bar connection assembly according to claim 1 or 2, characterized in that, The two-stage direct current voltage amplification sub-circuit (101) comprises a first-stage direct current voltage amplification unit and a second-stage direct current voltage amplification unit; The first-stage direct current voltage amplification unit comprises a first resistor R5, a second resistor R4, a third resistor R7, a fourth resistor R3, a fifth resistor R6, a sixth resistor R8, a first potentiometer VR1, a second potentiometer VR2, and a first operational amplifier U1A; Wherein, one end of the first resistor R5 is connected with the output end of the temperature acquisition sub-circuit (100) in series, the other end is connected with the non-inverting input terminal of the first operational amplifier U1A and one end of the fifth resistor R6 in parallel, the other end of the fifth resistor R6 is connected with the variable terminal M of the second potentiometer VR2, the fixed terminal 3 of the second potentiometer VR2 is connected with the control power supply ground GND, the fixed terminal 1 is connected with one end of the fourth resistor R3 in series, the other end of the fourth resistor R3 is connected with the control power supply negative terminal P-, the inverting input terminal of the first operational amplifier U1A is connected with the second resistor R4 and one end of the third resistor R7 in parallel, the other end of the second resistor R4 is connected with the control power supply ground GND, the other end of the third resistor R7 is connected with the fixed terminal 1 of the first potentiometer VR1 in series, the fixed terminal 3 and the variable terminal M of the first potentiometer VR1 are connected with the output terminal of the first operational amplifier U1A and one end of the sixth resistor R8 in parallel.

4. The temperature monitoring circuit for a multi-way copper busbar connection assembly of claim 3, wherein, The second-stage direct current voltage amplification unit comprises a seventh resistor R9, an eighth resistor R10, a ninth resistor R11, a voltage stabilizing diode DW1, and a second operational amplifier U1B; Wherein, one end of the sixth resistor R8 of the first-stage direct current voltage amplification unit is connected with the fixed terminal 3 and the variable terminal M of the first potentiometer VR1 and the output terminal of the first operational amplifier U1A in parallel, the other end is connected with the non-inverting input terminal of the second operational amplifier U1B in series, the inverting input terminal of the second operational amplifier U1B is connected with one end of the seventh resistor R9 and the eighth resistor R10 in parallel, the other end of the seventh resistor R9 is connected with the control power supply ground GND, the output terminal of the second operational amplifier U1B is connected with the other end of the eighth resistor R10 and one end of the ninth resistor R11.

5. The temperature monitoring circuit for a multi-way copper busbar connection assembly of claim 4, wherein, The V / A conversion output sub-circuit (102) is a conversion module DM1, which linearly converts the 0-5V DC voltage signal input by the two-stage DC voltage amplification sub-circuit (101) into a 4-20mA DC current signal output for use by an upper computer; One end of the ninth resistor R11 is connected to the cathode of the voltage stabilizing diode DW1 and the input end IN of the conversion module DM1 in parallel, and the anode of the voltage stabilizing diode DW1 is connected to the control power supply ground GND.

6. A high-power AC power supply, characterized by A temperature monitoring circuit for a multi-way copper bar connection assembly as claimed in any one of claims 1-5.

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