A kind of drive detection device of Fortescue converter IGBT

Abstract

The utility model relates to electronic electric power technical field discloses a kind of drive detection devices of Kefu De converter IGBT, including shell, the front side middle part of shell is provided with anti-magnetic field interference mechanism, the anti-magnetic field interference mechanism is used to shield the magnetic field interference generated by IGBT drive circuit, the outside of shell is provided with dynamic static detection mechanism, and the dynamic static detection mechanism is used to detect the data of IGBT drive circuit;The anti-magnetic field interference mechanism includes box, the box is fixedly connected in the front side middle part of shell, the outer wall rear side upper portion of box is fixedly connected with hinge, and the front end of hinge is fixedly connected with cover plate.The utility model is in, IGBT drive circuit is placed on support plate and rotates fixed frame and is fixed, and the grid, collector and emitter of IGBT are clamped by clamp, so that current can be normally conducted, then cover plate is closed, so that IGBT is in closed environment, avoid the detection of instrument by the magnetic field interference generated after electrification.

Description

Technical Field

[0001] This utility model relates to the field of electronic power technology, and in particular to a drive detection device for a Kefude converter IGBT. Background Technology

[0002] IGBT, or Insulated Gate Bipolar Transistor, is a power semiconductor device that combines the high-frequency switching characteristics of a metal-oxide-semiconductor field-effect transistor (MOSFET) with the low conduction loss characteristics of a power transistor. The IGBT's drive and detection device is a core intermediate component connecting the control circuit and the IGBT power device. Its main functions are to provide precise switching control signals to the IGBT, monitor its operating status in real time, and quickly trigger protection mechanisms in case of abnormalities, thereby ensuring the safe, efficient, and reliable operation of the IGBT. It is primarily used in industrial control and power electronics, energy storage, and power grid equipment.

[0003] The IGBT in a converter consists of a core semiconductor chip including a gate, emitter, collector, internal PN junction, and packaging components. IGBT drive testing is mainly divided into static testing and dynamic testing. Static testing uses a multimeter to measure the power supply voltage of the IGBT drive circuit, while dynamic testing uses an oscilloscope to observe the waveform of the drive signal, including parameters such as rise time, fall time, and pulse width. Strong electromagnetic interference exists near the IGBT drive circuit, and multimeters have weak anti-interference capabilities, making measurements easily susceptible to interference and resulting in distorted readings. Even with shielded cables in the measurement circuit, the effect is still not significant. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a drive detection device for IGBTs of the Kefude converter, which aims to improve the problem in the prior art that the measurement is easily affected by interference, resulting in distorted readings, and the effect is still not obvious even if the measurement circuit uses shielded wire.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a drive detection device for a Kefude converter IGBT, comprising a housing, an anti-magnetic field interference mechanism provided in the middle of the front side of the housing, the anti-magnetic field interference mechanism being used to shield the magnetic field interference generated by the IGBT drive circuit, and a dynamic and static detection mechanism provided on the outer side of the housing, the dynamic and static detection mechanism being used to detect the data of the IGBT drive circuit.

[0006] The anti-magnetic interference mechanism includes a housing, which is fixedly connected to the front middle of the outer shell. A hinge is fixedly connected to the upper rear side of the outer wall of the housing, and a cover plate is fixedly connected to the front end of the hinge. A first hole is opened on both the left and right sides of the housing. A conductive sheet is fixedly connected to the front end of the inner wall of the first hole. A wire is electrically connected to the middle of the conductive sheet. A clip is fixedly connected to the front end of the wire. A support plate is fixedly connected to the middle of the inner bottom wall of the housing.

[0007] As a further description of the above technical solution:

[0008] Insulating sleeves are fixedly connected to the left and right ends of the front side of the outer casing. Conductive rods are fixedly connected to the inner walls of the insulating sleeves. A switch is fixedly connected to the upper left rear end of the outer casing. A red test probe is connected to the upper middle part of the left rear end of the outer casing. A black test probe is connected to the upper middle part of the right rear end of the outer casing. High-voltage isolation probes are connected to the middle parts of the left and right rear ends of the outer casing. Low-voltage isolation probes are connected to the lower middle parts of the left and right rear ends of the outer casing. Current probes are connected to the lower middle parts of the left and right rear ends of the outer casing. A first battery is installed on the left rear end of the outer casing. A second battery is installed on the right rear end of the outer casing. A first display screen is installed on the left front end of the upper part of the outer casing. A second display screen is installed on the right front end of the upper part of the outer casing.

[0009] As a further description of the above technical solution:

[0010] The front left and right sides of the outer casing are provided with sliding grooves, and the inner walls of the sliding grooves are slidably connected with protective covers.

[0011] As a further description of the above technical solution:

[0012] The rear left and right ends of the outer shell are fixedly connected to connecting plates, and the front end of the connecting plates is fixedly connected to a probe holder.

[0013] As a further description of the above technical solution:

[0014] A fan is fixedly connected to the middle of the rear side of the housing, and a filter screen is fixedly connected to the front end of the fan.

[0015] As a further description of the above technical solution:

[0016] The bottom of the outer casing is fixedly connected to a base on the front, back, left and right sides, and the bottom of the base is fixedly connected to an anti-slip pad.

[0017] As a further description of the above technical solution:

[0018] The inner wall of the box is fixedly connected to an insulation board, and the inner wall of the insulation board is fixedly connected to a heat insulation board.

[0019] As a further description of the above technical solution:

[0020] Fixed end plates are installed on both the front and rear sides of the support plate, and a fixed frame is rotatably connected to the front end of the fixed end plate.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the IGBT drive circuit is placed on the support plate, the fixing frame is rotated to fix the IGBT drive circuit, and then the gate, collector and emitter of the IGBT are clamped with clamps respectively, so that the conductive sheet can normally conduct current to the connected electrodes. Then the cover plate is closed to put the IGBT in a closed environment, so as to avoid the magnetic field generated by the IGBT drive circuit after power-on from interfering with the instrument detection. The anti-interference effect is significant.

[0023] 2. In this utility model, the current signal is transmitted to the detection device through the conductive rod connected to the conductive sheet. Dynamic and static detection can be performed by switching the power supply and using test leads and different probes connected to the electrodes of the IGBT drive circuit, avoiding frequent instrument replacement and making operation convenient. Attached Figure Description

[0024] Figure 1 This is a perspective view of a drive detection device for a KEFDE converter IGBT proposed in this utility model;

[0025] Figure 2 This is a cross-sectional view of a drive detection device for a KEFDE converter IGBT proposed in this utility model;

[0026] Figure 3 This is a rear view of a drive detection device for a KEFDE converter IGBT proposed in this utility model;

[0027] Figure 4 This is a schematic diagram of the anti-magnetic field interference mechanism of the drive detection device for the IGBT of the Kefude converter proposed in this utility model.

[0028] Figure 5 The rear view of the dynamic and static detection mechanism of the drive detection device for the IGBT of the Kefude converter proposed in this utility model.

[0029] Figure 6 This is a front view of the dynamic and static detection mechanism of the drive detection device for the IGBT of the Kefude converter proposed in this utility model.

[0030] Figure 7 This is a partial structural schematic diagram of a drive detection device for a Kefude converter IGBT proposed in this utility model.

[0031] Legend:

[0032] 1. Outer shell; 2. Anti-magnetic field interference mechanism; 201. Box body; 202. Hinge; 203. Cover plate; 204. Conductive sheet; 205. Wire; 206. Clip; 207. Support plate; 208. First hole; 3. Dynamic and static detection mechanism; 301. Insulating sleeve; 302. Conductive rod; 303. Switch; 304. Red probe; 305. First battery; 306. Second battery; 307. Current probe; 308. Low-voltage isolation probe; 309. High-voltage isolation probe; 310. Black probe; 311. First display screen; 312. Second display screen; 4. Slide groove; 5. Protective cover; 6. Probe holder; 7. Connecting plate; 8. Filter screen; 9. Fan; 10. Base; 11. Anti-slip pad; 12. Insulation board; 13. Heat insulation board; 14. Fixed end plate; 15. Fixing frame. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 4 and Figure 7 This utility model provides an embodiment of a drive detection device for a Kefude converter IGBT, comprising a housing 1, an anti-magnetic field interference mechanism 2 disposed in the middle of the front side of the housing 1, the anti-magnetic field interference mechanism 2 being used to shield the magnetic field interference generated by the IGBT drive circuit, and a dynamic and static detection mechanism 3 disposed on the outer side of the housing 1, the dynamic and static detection mechanism 3 being used to detect the data of the IGBT drive circuit; the anti-magnetic field interference mechanism 2 includes a housing 201, the housing 201 being fixedly connected to the middle of the front side of the housing 1, a hinge 202 being fixedly connected to the upper rear side of the outer wall of the housing 201, a cover plate 203 being fixedly connected to the front end of the hinge 202, and first holes 2 being provided on both the left and right sides of the housing 201. 08. A conductive sheet 204 is fixedly connected to the front end of the inner wall of the first hole 208. A wire 205 is electrically connected to the middle of the conductive sheet 204. A clip 206 is fixedly connected to the front end of the wire 205 for clamping the IGBT electrode. A support plate 207 is fixedly connected to the middle of the inner bottom wall of the housing 201 for placing the IGBT. An insulation board 12 is fixedly connected to the inner wall of the housing 201. A heat insulation board 13 is fixedly connected to the inner wall of the insulation board 12 to prevent overheating from affecting the normal operation of the detection device. Fixed end plates 14 are installed on the front and rear sides of the support plate 207. A fixing bracket 15 is rotatably connected to the front end of the fixed end plate 14 for fixing the IGBT and preventing shaking from causing poor contact.

[0035] Specifically, open the cover plate 203 and place the IGBT drive circuit stably on the support plate 207. Adjust the position so that the clips 206 on both sides can clamp the collector, emitter, and gate of the IGBT. Then rotate the fixing bracket 15 to make it in close contact with the IGBT drive circuit and fix it on the support plate 207 to prevent it from moving during the testing process and causing testing errors. Afterwards, use the clips 206 to clamp the gate, collector, and emitter of the IGBT respectively, ensuring that the clips 206 are firmly connected to each electrode so that the conductive sheet 204 can... The current is normally conducted to the connected electrodes to ensure the circuit is unobstructed. Then the cover plate 203 made of insulating material is closed. The metal box 201 can prevent the magnetic field generated by the IGBT drive circuit after power-on from spreading outward, avoiding magnetic field interference with the instrument's detection and ensuring the accuracy of the detection results. The heat insulation plate 13 installed inside the box 201 can effectively prevent the heat generated when the IGBT drive circuit is turned on from being transferred outward, while the heat insulation plate 12 can reduce the heat exchange inside and outside the box (201) and avoid measurement errors caused by temperature changes in the detection device.

[0036] Reference Figure 2 , Figure 5 and Figure 6 Insulating sleeves 301 are fixedly connected to the left and right ends of the front side of the outer casing 1 to prevent current from being conducted to the housing 201 and causing leakage. Conductive rods 302 are fixedly connected to the inner wall of the insulating sleeves 301. A switch 303 is fixedly connected to the upper left end of the rear side of the outer casing 1 to switch the power supply for dynamic and static measurements. A red test probe 304 is connected to the upper middle part of the rear left end of the outer casing 1, and a black test probe 310 is connected to the upper middle part of the rear right end of the outer casing 1. High-voltage isolation probes 309 are connected to the middle parts of the left and right ends of the rear side of the outer casing 1. High-voltage isolation probes 309 are connected to the lower middle parts of the left and right ends of the rear side of the outer casing 1. A low-voltage isolation probe 308 is connected. Current probes 307 are wired to the lower middle part of the left and right rear ends of the housing 1, which contact the conductive rod 302 to conduct current signals. A first battery 305 is installed on the left rear end of the housing 1, and a second battery 306 is installed on the right rear end of the housing 1. A first display screen 311 is set on the left side of the upper front end of the housing 1, and a second display screen 312 is set on the right side of the upper front end of the housing 1. The test data can be observed through the display screen. A connecting plate 7 is fixedly connected to the left and right rear ends of the housing 1. A probe holder 6 is fixedly connected to the front end of the connecting plate 7 for placing the test leads and probes.

[0037] Specifically, rotate switch 303 to connect the first battery 305. First, perform a static measurement of the IGBT drive circuit. Remove the red probe 304 and the black probe 310, connecting the red probe 304 to the gate and the black probe 310 to the emitter. The normal resistance is ∞. Reverse the probes; if the resistance is still ∞, the IGBT is not damaged. If the resistance is close to 0Ω, the gate is short-circuited, and the IGBT is damaged. If the resistance is unstable or fluctuates, the gate oxide layer may be damaged. Connect the red probe 304 to the collector and the black probe 310 to the emitter. The normal resistance is several hundred kilohms to infinity. Reverse the probes; if the resistance is similar to the above, the IGBT is normal. If the resistance is close to 0Ω, the collector and emitter are short-circuited, and the IGBT is damaged. If the resistance is ∞, the IGBT may be open-circuited. Connect the red probe 304 to the collector and the black probe 310 to the gate. The normal resistance is ∞. If the resistance is abnormal, the insulation between the collector and the gate will break down, and the IGBT will be damaged. When performing dynamic measurements of the IGBT drive circuit, rotate the switch 303 to turn off the first battery 305 and turn on the second battery 306. Remove the low-voltage isolation probe 308, connect the gate and emitter, adjust the probe settings, observe the waveform and record the data. Remove the high-voltage isolation probe 309, connect the collector and emitter, adjust the probe settings, observe the waveform and record the data. Remove the current probe 307, connect it to the IGBT collector circuit, adjust the probe settings, observe the waveform and record the data. Switching the power supply makes dynamic and static testing of the IGBT more convenient. Place the used test leads and probes on the probe holder 6 to prevent dust from getting on the contact parts of the test leads and probes, which could cause poor contact and errors in the test data.

[0038] Reference Figure 1 and Figure 3 The front left and right sides of the outer casing 1 are provided with sliding grooves 4, and the inner wall of the sliding grooves 4 is slidably connected with protective covers 5 to protect the detection device from impacts; a fan 9 is fixedly connected to the middle of the rear side of the outer casing 1, and a filter screen 8 is fixedly connected to the front end of the fan 9 for heat dissipation of the device; a base 10 is fixedly connected to the front and rear left and right sides of the bottom of the outer casing 1, and an anti-slip pad 11 is fixedly connected to the bottom of the base 10 to prevent the detection device from sliding.

[0039] Specifically, the anti-slip pad 11 installed at the bottom of the outer casing 1 prevents the testing device from sliding due to operation, touch, or slight vibration during the testing process, ensuring the stability of the testing device; the protective cover 5 can block external objects from directly hitting the testing device, avoiding scratches or damage to the display screen surface, and also isolates dust and moisture in the air, preventing dust from adhering to the display screen surface and affecting observation, and also preventing moisture from entering the display screen and causing circuit failure; the fan 9 installed at the rear of the testing device starts when the testing device is running, reducing the internal temperature of the device and preventing overheating from affecting the normal operation and service life of the testing device.

[0040] Working principle: Remove the protective cover 5, open the cover plate 203, place the IGBT drive circuit on the support plate 207, rotate the fixing bracket 15 to fix the IGBT drive circuit, and then use the clips 206 to clamp the gate, collector, and emitter of the IGBT respectively, so that the conductive sheet 204 can normally conduct current to the connected electrodes. Then close the cover plate 203 to prevent the magnetic field generated by the IGBT drive circuit after power-on from interfering with the instrument's detection. Rotate the switch 303 to connect the first battery 305, and first perform static measurement of the IGBT drive circuit. Remove the red probe 304 and the black probe 310, so that the red probe 304 is connected to the gate and the black probe 310 is connected to the emitter. The normal resistance value is ∞. If the resistance remains ∞ after swapping the test leads, the IGBT is not damaged. If the resistance is close to 0Ω, the gate is short-circuited, and the IGBT is damaged. If the resistance is unstable or fluctuates, the gate oxide layer may be damaged. Connect the red test lead 304 to the collector and the black test lead 310 to the emitter. The normal resistance is several hundred kilohms to infinity. If the resistance is similar to the above after swapping the test leads, the IGBT is normal. If the resistance is close to 0Ω, the collector and emitter are short-circuited, and the IGBT is damaged. If the resistance is ∞, the IGBT may be open-circuited. Connect the red test lead 304 to the collector and the black test lead 310 to the gate. The normal resistance is ∞. If the resistance is abnormal, the insulation between the collector and gate has broken down, and the IGBT is damaged.

[0041] When performing dynamic measurements of the IGBT drive circuit, rotate the switch 303 to turn off the first battery 305 and turn on the second battery 306. Remove the low-voltage isolation probe 308, connect the gate and emitter, adjust the probe settings, observe the waveform, and record the data. Remove the high-voltage isolation probe 309, connect the collector and emitter, adjust the probe settings, observe the waveform, and record the data. Remove the current probe 307, connect it to the IGBT collector circuit, adjust the probe settings, observe the waveform, and record the data. The heat insulation plate 13 and the heat preservation plate 12 installed inside the housing 201 prevent the heat generated when the IGBT drive circuit is turned on from causing measurement errors in the detection device. The anti-slip pad 11 installed at the bottom prevents the detection device from sliding during detection. The protective cover 5 can prevent the first display screen 311 and the second display screen 312 from being bumped, and can also isolate dust and moisture. The fan 9 installed on the rear side is used to dissipate heat from the detection device.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drive detection device for a KEFDE converter IGBT, comprising a housing (1), characterized in that: A magnetic field interference prevention mechanism (2) is provided in the middle of the front side of the housing (1). The magnetic field interference prevention mechanism (2) is used to shield the magnetic field interference generated by the IGBT drive circuit. A dynamic and static detection mechanism (3) is provided on the outside of the housing (1). The dynamic and static detection mechanism (3) is used to detect the data of the IGBT drive circuit. The anti-magnetic interference mechanism (2) includes a housing (201), which is fixedly connected to the front middle of the outer shell (1). A hinge (202) is fixedly connected to the upper rear side of the outer wall of the housing (201). A cover plate (203) is fixedly connected to the front end of the hinge (202). A first hole (208) is provided on both the left and right sides of the housing (201). A conductive sheet (204) is fixedly connected to the front end of the inner wall of the first hole (208). A wire (205) is electrically connected to the middle of the conductive sheet (204). A clip (206) is fixedly connected to the front end of the wire (205). A support plate (207) is fixedly connected to the middle of the inner bottom wall of the housing (201).

2. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: Insulating sleeves (301) are fixedly connected to the left and right ends of the front side of the outer casing (1). Conductive rods (302) are fixedly connected to the inner wall of the insulating sleeves (301). A switch (303) is fixedly connected to the upper left end of the rear side of the outer casing (1). A red test probe (304) is connected to the upper middle part of the left middle end of the rear side of the outer casing (1). A black test probe (310) is connected to the upper middle part of the right middle end of the rear side of the outer casing (1). A high-voltage isolation probe (304) is connected to the middle part of the left and right middle ends of the rear side of the outer casing (1). 9) A low-voltage isolation probe (308) is wired to the lower middle part of the left and right rear ends of the outer casing (1), and a current probe (307) is wired to the lower middle part of the left and right rear ends of the outer casing (1). A first battery (305) is installed on the left rear end of the outer casing (1), and a second battery (306) is installed on the right rear end of the outer casing (1). A first display screen (311) is provided on the left side of the upper front end of the outer casing (1), and a second display screen (312) is provided on the right side of the upper front end of the outer casing (1).

3. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: The front left and right ends of the outer shell (1) are provided with sliding grooves (4), and the inner wall of the sliding groove (4) is slidably connected with a protective cover (5).

4. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: The rear left and right ends of the outer shell (1) are fixedly connected to a connecting plate (7), and the front end of the connecting plate (7) is fixedly connected to a probe holder (6).

5. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: A fan (9) is fixedly connected to the middle of the rear side of the outer casing (1), and a filter (8) is fixedly connected to the front end of the fan (9).

6. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: The bottom of the outer shell (1) is fixedly connected to a base (10) on the front, back and left sides, and the bottom of the base (10) is fixedly connected to an anti-slip pad (11).

7. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: The inner wall of the box (201) is fixedly connected to an insulation board (12), and the inner wall of the insulation board (12) is fixedly connected to a heat insulation board (13).

8. The drive detection device for a Kefude converter IGBT according to claim 1, characterized in that: The support plate (207) is equipped with fixed end plates (14) on both the front and rear sides, and the front end of the fixed end plate (14) is rotatably connected to a fixing frame (15).

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