CN216625297U

CN216625297U - Overvoltage protection circuit of IGBT chip

Info

Publication number: CN216625297U
Application number: CN202122930538.0U
Authority: CN
Inventors: 刘锋杰; 李向坤; 刘星义; 徐金金; 刘传利; 王琪
Original assignee: KEDA SEMICONDUCTOR CO Ltd
Current assignee: KEDA SEMICONDUCTOR CO Ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-05-27
Anticipated expiration: 2031-11-26

Abstract

The utility model relates to an overvoltage protection circuit of an IGBT chip, which comprises the IGBT chip, a power module and a standby power supply, wherein the power module supplies power to the IGBT chip, the power module is connected with a voltage detection module, the power module is connected to the IGBT chip through a switch module, the voltage detection module is connected to the switch module, and the switch module is connected to the standby power supply; utility model's an usage is, stir great or the voltage surpasss the biggest scope of bearing of IGBT chip when taking place the voltage and be, voltage detection module signaling control switch module action switches into stand-by power supply, utilizes stand-by power supply to last the power supply for the IGBT chip, avoids the IGBT chip outage to cause whole circuit paralysis to lose effect.

Description

Overvoltage protection circuit of IGBT chip

Technical Field

The utility model relates to the field of circuit protection, in particular to an overvoltage protection circuit of an IGBT chip.

Background

The IGBT is an insulated gate bipolar transistor, is a load full-control voltage drive composed of a BJT and an MOS, has the advantages of both high input impedance of the MOSFET and low conduction voltage drop of a GTR during a power semiconductor period, and is very suitable for being applied to the fields of current transformation systems with direct-current voltage of 600V or more, such as alternating-current motors, frequency converters, switching power supplies, lighting circuits, traction transmission and the like.

Because the IGBT chip is easily damaged, the voltage across the IGBT chip needs to be strictly controlled to prevent damage to other components caused by damage to the IGBT chip. However, in some monitoring, if the IGBT chip in the module or the safety module is subjected to a large voltage fluctuation to cut off the power supply, the IGBT chip is protected, but the whole module is stopped at the same time, which causes a chain accident.

Therefore, a new overvoltage protection circuit for IGBT chips is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problem that the whole module stops working after the existing IGBT chip protection circuit acts, so that a cascading accident is caused.

According to one aspect of the utility model, the overvoltage protection circuit of the IGBT chip comprises the IGBT chip and a power supply module, wherein the power supply module supplies power to the IGBT chip, a voltage detection module is connected to the power supply module, the power supply module is connected to the IGBT chip through a switch module, the voltage detection module is connected to the switch module, and a standby power supply is further included, and the switch module is connected to the standby power supply.

Through this scheme, stir great or the voltage surpasss the biggest scope of bearing of IGBT chip when taking place the voltage and be, voltage detection module sends signal control switch module action, switches into stand-by power supply, utilizes stand-by power supply to last the power supply for the IGBT chip, avoids the IGBT chip outage to cause whole circuit paralysis to lose effect.

Preferably, the switch module includes a main switch and a backup switch, the power module is connected to the IGBT chip through the main switch, and the backup power is connected to the IGBT chip through the backup switch.

Through this scheme, switch module opens the stand-by switch when can cutting off power module to realize the not outage work of IGBT chip.

Preferably, a charging switch is arranged in the switch module, and the power supply module is connected to the standby power supply through the charging switch.

Through this scheme, when normal use, the switch-on that charges is stand-by power supply to guarantee that it is in full power state all the time, this stand-by power supply is the battery.

Preferably, the backup power source includes a transformer and a backup battery, and the charging switch is connected to the backup battery through the transformer.

Through this scheme, the transformer can convert power module's electric current into backup battery and charge.

Preferably, still be provided with alarm switch on the switch module, alarm switch intercommunication alarm module and stand-by power supply.

Through this scheme, if switch to the stand-by battery after, alarm switch is got electric simultaneously and is reported to the police to inform the staff in time to handle, avoid whole circuit paralysis after the stand-by battery electric energy exhausts.

The circuit has the technical effects that the circuit is simple in structure, can not only play a role in monitoring and protecting the IGBT chip, but also can be switched to a standby power supply in time to supply power to the whole circuit, so that the occurrence of chain accidents caused by circuit breakdown is avoided.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

Fig. 1 is a block diagram of an overvoltage protection circuit of an IGBT chip according to an embodiment of the present invention.

Fig. 2 is a block diagram of the circuit configuration of the switching module and the standby power supply in fig. 1.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

Examples

As shown in fig. 1 and fig. 2, the overvoltage protection circuit for an IGBT chip in this embodiment includes an IGBT chip 100 and a power module 200, where the power module 200 supplies power to the IGBT chip 100, the power module 200 is connected to a voltage detection module 210, the power module 200 is connected to the IGBT chip 100 through a switch module 300, the voltage detection module 210 is connected to the switch module 300, and the overvoltage protection circuit further includes a standby power supply 400, and the switch module 300 is connected to the standby power supply 400.

Through the scheme of the embodiment, when voltage fluctuation is large or the voltage exceeds the maximum bearing range of the IGBT chip 100, the voltage detection module 210 sends a signal to control the switch module 300 to operate and switch to the standby power supply 400, and the standby power supply 400 is used for continuously supplying power to the IGBT chip 100, so that the phenomenon that the whole circuit is broken down and loses effect due to the fact that the IGBT chip 100 is powered off is avoided.

In this embodiment or other embodiments, the switch module 300 includes a main switch 310 and a standby switch 320, the power module 200 is connected to the IGBT chip 100 through the main switch 310, and the standby power 400 is connected to the IGBT chip 100 through the standby switch 320. The switching module 300 can switch off the power module 200 while opening the standby switch 320 to achieve the uninterrupted electrical operation of the IGBT chip 100.

In this embodiment or other embodiments, a charging switch 330 is disposed in the switch module 300, the power module 200 is connected to the standby power supply 400 through the charging switch 330, and during normal use, the charging switch 330 is turned on to supply power to the standby power supply 400 to ensure that the standby power supply is always in a full power state, where the standby power supply is a battery; when the power module 200 fails, the charging switch 330 is turned off to prevent the voltage of the power module 200 from affecting the standby power 400.

In this or other embodiments, the backup power source 400 includes a transformer 410 and a backup battery 420, and the charging switch 330 is connected to the backup battery 420 through the transformer 410. The transformer 410 can convert the current of the power module 200 into the backup battery 420 for charging.

In this embodiment or other embodiments, an alarm switch 340 is further disposed on the switch module 300, and the alarm switch 340 is connected to an alarm module 430 and the backup power supply 400. If the standby battery 420 is switched, the alarm switch 340 is powered on to alarm at the same time so as to inform the staff to process in time, and the whole circuit is prevented from being broken down after the electric energy of the standby battery is exhausted.

The technical effect of this embodiment lies in, this circuit structure is simple, not only can play the effect of control and protection to the IGBT chip, can in time switch over to stand-by power supply moreover, for whole circuit power supply, avoids the chain accident that the circuit paralysis caused to take place.

Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for the purpose of illustration and is not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. The utility model provides an overvoltage crowbar of IGBT chip, includes IGBT chip and power module, power module does the IGBT chip power supply, the last voltage detection module that is connected with of power module, power module is connected to through switch module the IGBT chip, voltage detection module is connected to switch module, its characterized in that still includes stand-by power supply, switch module is connected to stand-by power supply.

2. The overvoltage protection circuit for an IGBT chip according to claim 1, wherein the switch module includes a main switch through which the power supply module is connected to the IGBT chip, and a backup switch through which the backup power supply is connected to the IGBT chip.

3. The overvoltage protection circuit of the IGBT chip as claimed in claim 2, wherein a charging switch is disposed in the switch module, and the power supply module is connected to the backup power supply through the charging switch.

4. The overvoltage protection circuit for the IGBT chip as claimed in claim 3, wherein the backup power supply comprises a transformer and a backup battery, and the charging switch is connected to the backup battery through the transformer.

5. The overvoltage protection circuit of the IGBT chip as claimed in claim 2, wherein an alarm switch is further disposed on the switch module, and the alarm switch is connected to the alarm module and the standby power supply.