CN212845733U - A test device for IGBT load short-circuit protection - Google Patents
A test device for IGBT load short-circuit protection Download PDFInfo
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- CN212845733U CN212845733U CN202021249505.9U CN202021249505U CN212845733U CN 212845733 U CN212845733 U CN 212845733U CN 202021249505 U CN202021249505 U CN 202021249505U CN 212845733 U CN212845733 U CN 212845733U
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Abstract
The utility model discloses a testing device for IGBT load short-circuit protection, which comprises a high-voltage resistant large capacitor and a plurality of relays; one end of the relay K1 is connected with the positive end of the high-voltage power supply, the other end of the relay K1 is connected with the positive end of the high-voltage-resistant large capacitor, the positive end of the high-voltage-resistant large capacitor is connected with one end of the relay K2, the other end of the relay K2 is connected with one end of a load, the other end of the load is connected with the collector electrode of the IGBT transistor, and the relay K3 is connected with the load in parallel; and an emitting electrode of the IGBT transistor is connected with a high-voltage-resistant large capacitor, and the high-voltage-resistant large capacitor is connected with a high-voltage power supply. The utility model discloses avoided high voltage power supply to be unlikely to because of the load leads to some device to be out of order too greatly for protecting inside output end circuit, and disconnection power output (high voltage power supply protection) causes the problem that influences the test accuracy, not only realizes short circuit test purpose, has ensured test stability moreover, has improved the test accuracy.
Description
Technical Field
The utility model relates to a IGBT load short circuit test technical field, more specifically relates to a testing arrangement of IGBT load short circuit protection.
Background
In the existing IGBT load short-circuit testing device, the IGBT controls the on-off of the load at the collector terminal to realize the change of load current so as to control the change of power, and in order to simulate the situation that the internal short circuit of a load structure is caused by external force appearing in the process, a large-current relay is connected in parallel at the two ends of the load to realize the load short-circuit test.
Although the instantaneous large current provided by most high-voltage power supplies on the market is usually larger than 100A, the instantaneous large current provided by the load under the conditions of short circuit and resistance close to zero can be hundreds of amperes, and the high-voltage power supply can directly influence the accuracy of the load short circuit test because the power output is cut off (a high-voltage power supply protection mechanism) in order to protect an internal output end circuit from partial device malfunction caused by too large load.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's is not enough, provides a testing arrangement of IGBT load short-circuit protection, has avoided high voltage power supply to be unlikely to because of the load leads to partial device to be out of order too greatly for protecting inside output circuit, and the power output of disconnection (high voltage power supply protection) causes the problem that influences the test accuracy, not only realizes the short-circuit test purpose, has ensured test stability moreover, has improved the test accuracy.
The purpose of the utility model is realized through the following technical scheme:
a testing device for IGBT load short-circuit protection comprises a high-voltage-resistant large capacitor and a plurality of relays; one end of the relay K1 is connected with the positive end of the high-voltage power supply, the other end of the relay K1 is connected with the positive end of the high-voltage-resistant large capacitor, the positive end of the high-voltage-resistant large capacitor is connected with one end of the relay K2, the other end of the relay K2 is connected with one end of a load, the other end of the load is connected with the collector electrode of the IGBT transistor, and the relay K3 is connected with the load in parallel; and an emitting electrode of the IGBT transistor is connected with a high-voltage-resistant large capacitor, and the high-voltage-resistant large capacitor is connected with a high-voltage power supply.
Furthermore, the high-voltage-resistant large capacitor comprises a magnitude uF level and a high-voltage-resistant large capacitor with the voltage withstanding more than 1000V.
Further, the load includes a PTC load.
Further, the IGBT device comprises a DRV element, and the DRV element is connected with the base of the IGBT transistor.
The utility model has the advantages that:
(1) the utility model discloses avoided high voltage power supply to be unlikely to because of the load leads to some device to be out of order too greatly for protecting inside output end circuit, and disconnection power output (high voltage power supply protection) causes the problem that influences the test accuracy, not only realizes short circuit test purpose, has ensured test stability moreover, has improved the test accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description. Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Before describing the embodiments, some necessary terms need to be explained. For example:
if the terms "first," "second," etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Thus, a "first" element discussed below could also be termed a "second" element without departing from the teachings of the present invention. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.
The various terms appearing in this application are used for the purpose of describing particular embodiments only and are not intended as limitations on the invention, except where the context clearly dictates otherwise, the singular is intended to include the plural as well.
When the terms "comprises" and/or "comprising" are used in this specification, these terms are intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence and/or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As shown in fig. 1, a testing device for IGBT load short-circuit protection includes a high-voltage-resistant large capacitor and a plurality of relays; one end of the relay K1 is connected with the positive end of the high-voltage power supply, the other end of the relay K1 is connected with the positive end of the high-voltage-resistant large capacitor, the positive end of the high-voltage-resistant large capacitor is connected with one end of the relay K2, the other end of the relay K2 is connected with one end of a load, the other end of the load is connected with the collector electrode of the IGBT transistor, and the relay K3 is connected with the load in parallel; and an emitting electrode of the IGBT transistor is connected with a high-voltage-resistant large capacitor, and the high-voltage-resistant large capacitor is connected with a high-voltage power supply.
Furthermore, the high-voltage-resistant large capacitor comprises a magnitude uF level and a high-voltage-resistant large capacitor with the voltage withstanding more than 1000V.
Further, the load includes a PTC load.
Further, the IGBT device comprises a DRV element, and the DRV element is connected with the base of the IGBT transistor.
The utility model discloses a theory of operation:
a high-voltage-resistant large capacitor is placed between a high-voltage source and a load, a relay is connected in series with the positive end of the high-voltage source to control the high-voltage capacitor to be charged, the relay is connected in series with the positive output end of the high-voltage capacitor to control output, and the influence of a high-voltage power supply protection mechanism on a load short-circuit test is avoided by using a capacitor charging and discharging mechanism. Specifically, before the high-voltage power supply is powered on, as shown in fig. 1, the relays K2 and K3 are disconnected, the relay K1 is closed, the high-voltage power supply outputs, the high-voltage-resistant large capacitor is charged, when the current output of the high-voltage power supply is observed to be unchanged, the high-voltage-resistant large capacitor is fully charged, the relay K1 is disconnected before a load short circuit test, then the relay K3 is closed first, then the relay K2 is closed, the high-voltage-resistant large capacitor fully charged can provide instantaneous large current, and the electric charge is reduced along with the discharge of the high-voltage-resistant large capacitor, so that the current can.
Through the design, the problem that the test accuracy is influenced due to the fact that the high-voltage power supply is used for protecting an internal output end circuit from being abnormal due to the fact that a part of devices are not normal due to too large load when the power output is cut off (namely, the high-voltage power supply protection mechanism) can be avoided, the purpose of short-circuit test is achieved, the test stability is guaranteed, and the test accuracy is improved.
In other technical features in this embodiment, those skilled in the art can flexibly select the technical features according to actual situations to meet different specific actual requirements. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known components, structures or parts are not described in detail in order to avoid obscuring the present invention, and the technical scope of the present invention is defined by the claims.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are used in a generic sense as is understood by those skilled in the art. For example, the components may be fixedly connected, movably connected, integrally connected, or partially connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, or connected inside two elements, and the like, and for those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations, that is, the expression of the language and the implementation of the actual technology can flexibly correspond, and the expression of the language (including the drawings) of the specification of the present invention does not constitute any single restrictive interpretation of the claims.
Modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, which should be limited only by the claims appended hereto. In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the invention. In other instances, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been described in detail in order to avoid obscuring the present invention.
Claims (4)
1. A testing device for IGBT load short-circuit protection is characterized by comprising a high-voltage-resistant large capacitor and a plurality of relays; one end of the relay K1 is connected with the positive end of the high-voltage power supply, the other end of the relay K1 is connected with the positive end of the high-voltage-resistant large capacitor, the positive end of the high-voltage-resistant large capacitor is connected with one end of the relay K2, the other end of the relay K2 is connected with one end of a load, the other end of the load is connected with the collector electrode of the IGBT transistor, and the relay K3 is connected with the load in parallel; and an emitting electrode of the IGBT transistor is connected with a high-voltage-resistant large capacitor, and the high-voltage-resistant large capacitor is connected with a high-voltage power supply.
2. The testing device for the short-circuit protection of the IGBT load according to claim 1, wherein the high-voltage-resistant large capacitor comprises a magnitude uF level and a high-voltage-resistant large capacitor with a withstand voltage of more than 1000V.
3. The IGBT load short-circuit protection test device according to claim 1, wherein the load comprises a PTC load.
4. The device for testing the short-circuit protection of the IGBT load according to any one of claims 1 to 3, characterized by comprising a DRV element, wherein the DRV element is connected with the base of the IGBT transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021249505.9U CN212845733U (en) | 2020-06-30 | 2020-06-30 | A test device for IGBT load short-circuit protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021249505.9U CN212845733U (en) | 2020-06-30 | 2020-06-30 | A test device for IGBT load short-circuit protection |
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| CN212845733U true CN212845733U (en) | 2021-03-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612267A (en) * | 2021-06-24 | 2021-11-05 | 陕西华昱太阳能科技有限公司 | Safe discharge circuit of electronic gun and control method |
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- 2020-06-30 CN CN202021249505.9U patent/CN212845733U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113612267A (en) * | 2021-06-24 | 2021-11-05 | 陕西华昱太阳能科技有限公司 | Safe discharge circuit of electronic gun and control method |
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