Thyristor junction temperature monitoring device
By using voltage sensors, current sensors, and digital signal processors in thyristors, combined with the PN junction formula and the TMSF28335 chip, the problem of inaccurate junction temperature judgment in thyristors has been solved, enabling accurate junction temperature monitoring and health status assessment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-04-07
AI Technical Summary
In the existing technology, the junction temperature of thyristors is not accurately determined under complex operating conditions, especially in AC-AC frequency conversion and press-fit thyristors, where changes in thermal network parameters lead to inaccurate junction temperature determination.
Using voltage sensors, current sensors, and digital signal processors, the junction temperature is monitored by acquiring the gate voltage, gate current, and current flowing through the anode and cathode of the thyristor, fitting the junction temperature using the PN junction formula, and combining an operational amplifier circuit and TI's TMSF28335 chip.
This enables precise monitoring of thyristor junction temperature, reduces the probability of system failure, and ensures accurate assessment of thyristor health status.
Smart Images
Figure CN224095949U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thyristor monitoring technology, and in particular to a thyristor junction temperature monitoring device. Background Technology
[0002] As a high-voltage and high-capacity power device, the thyristor usually operates under high voltage, high current and frequent start-stop conditions. During operation, the thyristor has high power loss and generates a lot of heat. Excessive junction temperature will damage the life of the thyristor and cause it to fail, resulting in serious accidents. It is necessary to develop a device to monitor the junction temperature of the thyristor in real time.
[0003] In existing technologies, non-invasive junction temperature monitoring techniques for thyristors typically rely on electrothermal coupling models. These models require collecting electrical parameters, calculating thyristor losses, fitting thermal network parameters, and combining these with case temperature data to determine the junction temperature. However, for complex operating conditions such as AC-AC frequency conversion, the thyristor loss function is complex. Furthermore, for press-fit thyristors, the internal pressure changes with increasing junction and case temperatures, leading to variations in interlayer contact thermal resistance and inaccurate thermal network parameters, ultimately resulting in inaccurate junction temperature determination. Utility Model Content
[0004] This utility model provides a thyristor junction temperature monitoring device, which can solve the problem of inaccurate junction temperature judgment in the prior art.
[0005] This utility model provides a thyristor junction temperature monitoring device, comprising: a voltage sensor, a first current sensor, a second current sensor, and a digital signal processor; the input terminal of the voltage sensor is connected to the gate terminal of the thyristor, and the output terminal of the voltage sensor is connected to the input terminal of the digital signal processor; the input terminal of the first current sensor is connected to the gate terminal of the thyristor, and the output terminal of the first current sensor is connected to the input terminal of the digital signal processor; the input terminal of the second current sensor is connected to the anode terminal of the thyristor, and the output terminal of the second current sensor is connected to the input terminal of the digital signal processor.
[0006] Furthermore, an operational amplifier circuit is connected between the output terminal of the voltage sensor and the input terminal of the digital signal processor.
[0007] Furthermore, the output terminal of the second current sensor is also connected to one end of a resistor, and the other end of the resistor is grounded.
[0008] Furthermore, the thyristor is driven by a pulse drive circuit.
[0009] Furthermore, the digital signal processor employs a controller TMSF28335.
[0010] Furthermore, the operational amplifier circuit includes: an operational amplifier, a resistor, and a capacitor; the operational amplifier and the resistor are connected in parallel, and the resistor and the capacitor are connected in parallel.
[0011] This utility model provides a thyristor junction temperature monitoring device, which has the following advantages compared with the prior art:
[0012] The junction temperature can be derived using the PN junction formula. In the process, the parameters of the PN junction need to be accurately determined. By accurately collecting the gate voltage, gate current, and current flowing through the anode and cathode of the thyristor, the parameters of the PN junction formula can be determined. Thus, the junction temperature can be directly determined using the gate voltage, gate current, and current flowing through the anode and cathode of the thyristor. Attached Figure Description
[0013] Figure 1 Connection diagram of the thyristor monitoring device provided in the embodiment of this utility model;
[0014] Figure 2 A connection diagram of the measurement circuit provided in an embodiment of this utility model. Detailed Implementation
[0015] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0016] 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.
[0017] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0018] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0019] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0020] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0021] See Figure 1 This utility model provides a device for monitoring the junction temperature of a thyristor, comprising:
[0022] The system consists of a thyristor, a voltage sensor, a first current sensor, a second current sensor, and a digital signal processor. The thyristor is driven by a pulse drive circuit, and the digital signal processor uses a TMSF28335 controller.
[0023] The voltage sensor has its input terminal connected to the gate terminal of the thyristor and its output terminal connected to the input terminal of the TMSF28335 controller. The first current sensor has its input terminal connected to the gate terminal of the thyristor and its output terminal connected to the input terminal of the TMSF28335 controller. The second current sensor has its input terminal connected to the anode terminal of the thyristor and its output terminal connected to the input terminal of the TMSF28335 controller.
[0024] An operational amplifier circuit is connected between the output of the voltage sensor and the input of the TMSF28335 controller. This operational amplifier circuit includes an operational amplifier, a resistor, and a capacitor, with the operational amplifier and resistor connected in parallel, and the resistor and capacitor also connected in parallel. The output of the second current sensor is also connected to one end of a resistor, with the other end grounded.
[0025] This invention first experimentally collects the gate voltage (UGK), gate current (IGK), and current flowing through the anode and cathode of the thyristor (IAK). Then, it fits the relationship between the junction temperature of the thyristor and the measured parameters according to the PN junction formula.
[0026]
[0027] In the formula, U f This is the forward voltage of the PN junction. I f The current flowing through the PN junction, T The junction temperature is denoted as , and the other parameters are those that need to be fitted.
[0028] By fitting the relationship between junction temperature and electrical parameters, the junction temperature information of the thyristor can be reflected by detecting the electrical parameters in practical thyristor applications.
[0029] The hardware structure of this utility model includes a second current sensor (replaceable current transformer) for measuring the current (IAK) flowing through the anode and cathode of the thyristor, a voltage sensor and a first current sensor for measuring the gate voltage (UGK) and gate current (IGK) of the thyristor, and a controller for data acquisition, calculation and communication.
[0030] The controller uses the TI TMSF28335 chip. It determines the sampling time based on the pulse trigger signal and delay, collects the electrical parameters at the same time, calculates the junction temperature, and then performs communication.
[0031] This invention accurately obtains the junction temperature information of the thyristor based on electrical parameters, which is used to determine the health information of the thyristor and reduce the probability of system failure.
[0032] A specific example is as follows:
[0033] This invention relates to a device for monitoring the junction temperature of a thyristor. First, in a constant temperature chamber, the relationship between the gate current, gate voltage, anode current, and junction temperature is determined and a function is fitted. Then, by continuously monitoring the gate current, gate voltage, and anode current of the thyristor, the junction temperature of the thyristor is derived.
[0034] The testing method is as follows:
[0035] (1) Figure 2 The measurement circuit shown is placed in a constant temperature chamber and left to stabilize at the junction temperature.
[0036] (6) Turn on the circuit and collect the gate current, gate voltage and anode current.
[0037] (7) Adjust the temperature of the constant temperature chamber and the anode current, and repeat the above two steps.
[0038] (8) Fit the functions of gate current, gate voltage and anode current with junction temperature according to the formula of PN junction.
[0039] In actual operation, the gate current, gate voltage and anode current of the thyristor are monitored to deduce the junction temperature of the thyristor.
[0040] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A device for monitoring the junction temperature of a thyristor, characterized in that, include: Voltage sensor, first current sensor, second current sensor, and digital signal processor; The input terminal of the voltage sensor is connected to the gate terminal of the thyristor, and the output terminal of the voltage sensor is connected to the input terminal of the digital signal processor. The input terminal of the first current sensor is connected to the gate terminal of the thyristor, and the output terminal of the first current sensor is connected to the input terminal of the digital signal processor. The input terminal of the second current sensor is connected to the anode terminal of the thyristor, and the output terminal of the second current sensor is connected to the input terminal of the digital signal processor.
2. The thyristor junction temperature monitoring device as described in claim 1, characterized in that, An operational amplifier circuit is also connected between the output terminal of the voltage sensor and the input terminal of the digital signal processor.
3. The thyristor junction temperature monitoring device as described in claim 1, characterized in that, The output terminal of the second current sensor is also connected to one end of a resistor, and the other end of the resistor is grounded.
4. The thyristor junction temperature monitoring device as described in claim 1, characterized in that, The thyristor is driven by a pulse drive circuit.
5. The thyristor junction temperature monitoring device as described in claim 1, characterized in that, The digital signal processor uses the TMSF28335 controller.
6. The thyristor junction temperature monitoring device as described in claim 2, characterized in that, The operational amplifier circuit includes: an operational amplifier, resistors, and capacitors; The operational amplifier is connected in parallel with a resistor, and the resistor is connected in parallel with a capacitor.