CN217935086U - Economical IGBT instantaneous overcurrent protection circuit - Google Patents
Economical IGBT instantaneous overcurrent protection circuit Download PDFInfo
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- CN217935086U CN217935086U CN202221960943.5U CN202221960943U CN217935086U CN 217935086 U CN217935086 U CN 217935086U CN 202221960943 U CN202221960943 U CN 202221960943U CN 217935086 U CN217935086 U CN 217935086U
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Abstract
The utility model discloses an economical IGBT instantaneous overcurrent protection circuit, which relates to the technical field of IGBT protection and comprises a power module for supplying power; the sampling module is used for current sampling and voltage conversion; the electric energy output module is used for transmitting electric energy; the constant-pressure module is used for constant-pressure treatment; the isolation current limiting control module is used for threshold comparison and isolation current limiting control; the current sampling and comparing module is used for sampling and comparing an isolation threshold value of the current after current limiting; and the overcurrent protection module is used for overcurrent protection. The utility model discloses economical instantaneous overcurrent protection's of IGBT circuit adopts isolation current limiting control module and overcurrent protection module to realize overflowing in the twinkling of an eye to carry out duplicate protection to the IGBT to overflowing the condition in advance, avoid overflowing in the twinkling of an eye and lead to IGBT's damage, when the current still surpassed the overcurrent threshold value of settlement behind the current-limiting, will directly break off the power supply to IGBT through overcurrent protection module simultaneously.
Description
Technical Field
The utility model relates to a IGBT protection technical field specifically is an instantaneous overcurrent protection's of economical IGBT circuit.
Background
An Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device composed of a Bipolar Transistor and an Insulated Gate field effect Transistor, and has the advantages of both high input impedance of a metal oxide semiconductor field effect Transistor and low conduction voltage drop of a power Transistor.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an instantaneous overcurrent protection's of economical IGBT circuit to solve the problem that proposes among the above-mentioned background art.
According to the embodiment of the utility model provides an in, provide an instantaneous overcurrent protection's of economical IGBT circuit, this instantaneous overcurrent protection's of economical IGBT circuit includes: the device comprises a power supply module, a sampling module, an electric energy output module, a constant voltage module, an isolation current limiting control module, an IGBT module, a current sampling comparison module and an overcurrent protection module;
the power supply module is used for providing required electric energy;
the sampling module is connected with the power supply module, is used for sampling and voltage conversion processing of current signals in the electric energy output by the power supply module, and is used for transmitting the electric energy output by the power supply module;
the electric energy output module is connected with the sampling module and used for receiving and outputting the electric energy transmitted by the sampling module;
the constant voltage module is connected with the sampling module and is used for performing constant voltage processing on the voltage signal sampled by the sampling module;
the isolation current limiting control module is connected with the constant voltage module, the sampling module and the electric energy output module, is used for performing threshold comparison on the voltage output by the constant voltage module, and is used for isolating and controlling the connection and disconnection of the current limiting circuit;
the IGBT module is connected with the isolated current-limiting control module and is used for controlling the condition of the flowing voltage and current;
the current sampling comparison module is connected with the isolated current-limiting control module, is used for sampling the current limited by the isolated current-limiting control module, and is used for comparing the isolated threshold of the sampled current and outputting a comparison result;
the overcurrent protection module is connected with the sampling module, the electric energy output module and the current sampling comparison module and is used for receiving the comparison result and isolating and controlling the electric energy output by the sampling module.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses economic type IGBT instantaneous overcurrent protection's circuit adopts isolation current limiting control module and overcurrent protection module to realize overflowing in the twinkling of an eye to the IGBT and carry out duplicate protection, and carry out current-limiting control to the overcurrent condition in advance, avoid overflowing in the twinkling of an eye and lead to the damage of IGBT, when the overcurrent threshold value of settlement is still surpassed to the electric current after the current limiting simultaneously, will be directly through the power supply of overcurrent protection module disconnection to the IGBT, improve the protection to the IGBT, adopt isolation control's mode on the way of carrying out overcurrent protection simultaneously, improve the control accuracy to overcurrent protection, avoid the influence between the circuit, and the overcurrent protection circuit structure who takes is simple and easy, and is low in cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention 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 the drawings without creative efforts.
Fig. 1 is the utility model discloses the principle block diagram of the instantaneous overcurrent protection's of economical IGBT circuit that the example provided.
Fig. 2 is a circuit diagram of an economical IGBT instantaneous overcurrent protection circuit provided by an example of the present invention.
Fig. 3 is a circuit diagram of the overcurrent protection module according to an embodiment of the present invention.
Detailed Description
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 work belong to the protection scope of the present invention.
In embodiment 1, referring to fig. 1, a circuit for instantaneous overcurrent protection of an economical IGBT includes: the device comprises a power module 1, a sampling module 2, an electric energy output module 3, a constant voltage module 4, an isolation current-limiting control module 5, an IGBT module 6, a current sampling comparison module 7 and an overcurrent protection module 8;
specifically, the power module 1 is used for providing required electric energy;
the sampling module 2 is connected with the power supply module 1, is used for sampling and voltage conversion processing of current signals in the electric energy output by the power supply module 1, and is used for transmitting the electric energy output by the power supply module;
the electric energy output module 3 is connected with the sampling module 2 and used for receiving and outputting the electric energy transmitted by the sampling module 2;
the constant voltage module 4 is connected with the sampling module 2 and is used for performing constant voltage processing on the voltage signal sampled by the sampling module 2;
the isolation current limiting control module 5 is connected with the constant voltage module 4, the sampling module 2 and the electric energy output module 3, and is used for performing threshold comparison on the voltage output by the constant voltage module 4 and for performing isolation control on connection and disconnection of a current limiting circuit;
the IGBT module 6 is connected with the isolated current limiting control module 5 and is used for controlling the condition of the flowing voltage and current;
the current sampling comparison module 7 is connected with the isolation current limiting control module 5, and is used for sampling the current limited by the isolation current limiting control module 5, comparing the isolation threshold of the sampled current and outputting a comparison result;
and the overcurrent protection module 8 is connected with the sampling module 2, the electric energy output module 3 and the current sampling comparison module 7 and is used for receiving the comparison result and isolating and controlling the electric energy output by the sampling module 2.
In a specific embodiment, the power module 1 may provide the required electric energy for the circuit by using a direct current power supply mode, which is not described herein again; the electric energy output module 3 can adopt, but is not limited to, a voltage processing circuit such as a DC-DC conversion circuit, a DC-AC conversion circuit and the like to complete processing of input electric energy; the IGBT module 6 is an IGBT circuit to be detected and protected, and is not described herein.
In the present embodiment, referring to fig. 2 and fig. 3, the sampling module 2 includes a transformer H1, a first capacitor C1, and a fifteenth resistor R15;
specifically, a first end of the transformer H1 is connected to the power module 1, a second end of the transformer H1 is connected to the power output module 3, a third end of the mutual inductance is connected to the ground and one end of the first capacitor C1, the other end of the first capacitor C1 is connected to a fourth end of the transformer H1 and a first end of the fifteenth resistor R15, and a second end of the fifteenth resistor R15 is connected to the constant voltage module 4.
In a specific embodiment, the transformer H1 is configured to adopt a current signal output by the power module 1; the first capacitor C1 is used for performing filtering processing; the fifteenth resistor R15 is used to convert the sampled current signal into a voltage signal.
Further, the constant voltage module 4 includes a first resistor R1, a second capacitor C2, a first voltage regulator VD1, a first switch tube VT1, a first diode D1, and a third capacitor C3;
specifically, one end of the first resistor R1, one end of the second capacitor C2, and a collector of the first switch tube VT1 are all connected to the second end of the fifteenth resistor R15, the other end of the first resistor R1 is connected to a cathode of the first voltage regulator tube VD1 and a base of the first switch tube VT1, an emitter of the first switch tube VT1 is connected to a cathode of the first diode D1, one end of the third capacitor C3, and the isolation current limiting control module 5, and the other end of the second capacitor C2, an anode of the first voltage regulator tube VD1, an anode of the first diode D1, and the other end of the third capacitor C3 are all grounded.
In a specific embodiment, the first switch tube VT1 may be an NPN transistor, and the first resistor R1, the second capacitor C2, the first voltage regulator tube VD1, the first diode D1, and the third capacitor C3 are used to perform voltage stabilization on the input voltage and output the voltage.
Further, the isolation current limiting control module 5 includes a second diode D2, a second resistor R2, a first optocoupler J1, a third resistor R3, a fourth resistor R4, a second switching tube VT2, a fifth resistor R5, a fourth capacitor C4, and a sixth resistor R6;
specifically, the cathode of the second diode D2 and the first end of the first optocoupler J1 are both connected to the emitter of the first switch tube VT1, the anode of the second diode D2 is connected to the second end of the first optocoupler J1 and is connected to the ground through the second resistor R2, the third end of the first optocoupler J1 is connected to the base of the second switch tube VT2 and is connected to the second end of the transformer H1, the emitter of the second switch tube VT2, one end of the fourth capacitor C4 and the first end of the sixth resistor R6 through the third resistor R3, the fourth end of the first optocoupler J1 is connected to the ground through the fourth resistor R4, the collector of the second switch tube VT2 is connected to the other end of the fourth capacitor C4 through the fifth resistor R5, and the second end of the sixth resistor R6 is connected to the current sampling and comparing module 7.
In a specific embodiment, the second diode D2 is a set overcurrent threshold, and when the voltage output by the constant voltage module 4 exceeds the breakdown voltage of the second diode D2, the second diode D2 is broken down and turned on; the first optical coupler J1 can be a PC817 photoelectric coupler; the second switching tube VT2 may be a PNP triode; the fourth capacitor C4, the fifth resistor R5, and the sixth resistor R6 perform current limiting control.
Further, the current sampling comparison module 7 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first power VCC1, a second optocoupler J2, a tenth resistor R10, a second power VCC2, a first comparator A1, an eleventh resistor R1, and an overcurrent threshold; the IGBT module 6 includes an IGBT;
specifically, one end of the seventh resistor R7 and one end of the eighth resistor R8 are both connected to the second end of the sixth resistor R6, the other end of the seventh resistor R7 is connected to the second end of the second optocoupler J2, the collector of the second switching tube VT2, and the collector of the IGBT, the emitter of the IGBT is connected to the power module 1, the other end of the eighth resistor R8 is connected to the first end of the second optocoupler J2 and is connected to the first power VCC1 through the ninth resistor R9, the third end of the second optocoupler J2 is connected to the non-inverting end of the first comparator A1 and is connected to one end of the second power VCC2 and the eleventh resistor R1 through the tenth resistor R10, the inverting end of the first comparator A1 is connected to the threshold, and the output end of the first comparator A1 is connected to the other end of the eleventh resistor R1 and the overcurrent protection module 8.
In a specific embodiment, the seventh resistor R7 may adopt a current sampling resistor, and the eighth resistor R8 is configured to convert the sampling current into a sampling voltage; the second optical coupler J2 can be a PC817 photoelectric coupler; the first comparator A1 may be an LM393 comparator.
Further, the overcurrent protection module 8 includes a third optocoupler J3, a twelfth resistor R12, a thirteenth resistor R13, a third power supply VCC3, a second voltage regulator VD2, a first power tube Q1, and a fourteenth resistor R14;
specifically, the first end of the third optocoupler J3 is connected to the output end of the first comparator A1, the second end of the third optocoupler J3 is grounded, the third end of the third optocoupler J3 is connected to a third power VCC3 through a twelfth resistor R12, the fourth end of the third optocoupler J3 is connected to one end of a thirteenth resistor R13, the cathode of the second voltage regulator tube VD2 and the gate of the first power tube Q1, the other end of the thirteenth resistor R13 and the anode of the second voltage regulator tube VD2 are grounded, the drain of the first power tube Q1 is connected to the sampling module 2 and the electric energy output module 3 through a fourteenth resistor R14, and the source of the first power tube Q1 is connected to the ground.
In a specific embodiment, the third optical coupler J3 may be an LM393 comparator; the first power transistor Q1 may be an N-channel enhancement MOS transistor, and is matched with the fourteenth resistor R14 to control the electric energy transmitted by the sampling module 2.
The utility model relates to an economical IGBT instantaneous overcurrent protection circuit, which is characterized in that a power module 1 provides required electric energy, a mutual inductor H1 samples current, a first capacitor C1 filters the current, a fifteenth resistor R15 converts the sampled current signal into a voltage signal, and a constant voltage circuit consisting of a first resistor R1, a second capacitor C2, a first voltage regulator VD1, a first switch tube VT1, a first diode D1 and a third capacitor C3 processes the input voltage signal in a constant voltage way, when the output constant voltage exceeds the breakdown voltage of the second diode D2, the second diode D2 is conducted, the first optical coupler J1 is cut off, the second switch tube VT2 is cut off, so that a fourth capacitor C4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 are connected into the circuit to carry out current limiting protection and sampling control, thereby protecting the IGBT module 6 from the influence of instantaneous overcurrent, the current limiting situation sampled by the seventh resistor R7 is transmitted by the second optocoupler J2 and is compared with an overcurrent threshold value through the first comparator A1, when a current signal after current limiting is greater than the overcurrent threshold value, the third optocoupler J3 is directly controlled to be switched on, the first power tube Q1 is driven to be switched on, electric energy transmitted by the sampling module 2 is cut off, overcurrent protection is realized, when the second diode D2 is not punctured, the first optocoupler J1 is switched on, the second switching tube VT2 is switched on, the IGBT module 6 normally works, the economical IGBT instantaneous overcurrent protection circuit adopts the isolation current limiting control module 5 and the overcurrent protection module 8 to realize double protection on the instantaneous overcurrent of the IGBT, current limiting control is carried out on the overcurrent condition in advance, damage of the IGBT caused by the instantaneous overcurrent is avoided, and meanwhile, when the current after current limiting still exceeds the set overcurrent threshold value, power supply to the IGBT is directly cut off through the overcurrent protection module 8, the protection to the IGBT is improved, meanwhile, an isolation control mode is adopted in the process of overcurrent protection, the control precision of the overcurrent protection is improved, the influence between circuits is avoided, and the adopted overcurrent protection circuit is simple and easy in structure and low in cost.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. An economical IGBT instantaneous overcurrent protection circuit is characterized in that,
this economic type IGBT instantaneous overcurrent protection's circuit includes: the device comprises a power supply module, a sampling module, an electric energy output module, a constant voltage module, an isolation current limiting control module, an IGBT module, a current sampling comparison module and an overcurrent protection module;
the power supply module is used for providing required electric energy;
the sampling module is connected with the power module, is used for sampling current signals in the electric energy output by the power module and performing voltage conversion processing, and is used for transmitting the electric energy output by the power module;
the electric energy output module is connected with the sampling module and used for receiving and outputting the electric energy transmitted by the sampling module;
the constant voltage module is connected with the sampling module and is used for performing constant voltage processing on the voltage signal sampled by the sampling module;
the isolation current limiting control module is connected with the constant voltage module, the sampling module and the electric energy output module, is used for performing threshold comparison on the voltage output by the constant voltage module, and is used for performing isolation control on connection and disconnection of a current limiting circuit;
the IGBT module is connected with the isolated current-limiting control module and is used for controlling the condition of the flowing voltage and current;
the current sampling comparison module is connected with the isolated current-limiting control module, is used for sampling the current limited by the isolated current-limiting control module, and is used for comparing the isolated threshold of the sampled current and outputting a comparison result;
the overcurrent protection module is connected with the sampling module, the electric energy output module and the current sampling comparison module and is used for receiving the comparison result and isolating and controlling the electric energy output by the sampling module.
2. The economical IGBT instantaneous overcurrent protection circuit of claim 1, wherein the sampling module comprises a mutual inductor, a first capacitor, a fifteenth resistor;
the first end of the mutual inductor is connected with the power supply module, the second end of the mutual inductor is connected with the electric energy output module, the third end of the mutual inductor is connected with the ground end and one end of the first capacitor, the other end of the first capacitor is connected with the fourth end of the mutual inductor and the first end of the fifteenth resistor, and the second end of the fifteenth resistor is connected with the constant voltage module.
3. The economical instantaneous overcurrent protection circuit of the IGBT as claimed in claim 2, wherein the constant voltage module comprises a first resistor, a second capacitor, a first voltage regulator tube, a first switch tube, a first diode, and a third capacitor;
one end of the first resistor, one end of the second capacitor and a collector of the first switch tube are connected with a second end of the fifteenth resistor, the other end of the first resistor is connected with a cathode of the first voltage-regulator tube and a base of the first switch tube, an emitter of the first switch tube is connected with a cathode of the first diode, one end of the third capacitor and the isolation current-limiting control module, and the other end of the second capacitor, an anode of the first voltage-regulator tube, an anode of the first diode and the other end of the third capacitor are grounded.
4. The economical IGBT instantaneous overcurrent protection circuit according to claim 3, wherein the isolation current limiting control module comprises a second diode, a second resistor, a first optocoupler, a third resistor, a fourth resistor, a second switching tube, a fifth resistor, a fourth capacitor and a sixth resistor;
the negative pole of second diode and the first end of first opto-coupler all are connected the projecting pole of first switch tube, the second end of first opto-coupler and through second ohmic connection ground end are connected to the positive pole of second diode, the base of second switch tube and through third ohmic connection to the third end of first opto-coupler the second end of mutual-inductor, the projecting pole of second switch tube, the one end of fourth electric capacity and the first end of sixth resistance, the fourth end of first opto-coupler passes through fourth ohmic connection ground end, and the collecting electrode of second switch tube passes through the other end of fifth ohmic connection fourth electric capacity, and the second end of sixth resistance is connected the current sampling comparison module.
5. The economical instantaneous overcurrent protection circuit of the IGBT as claimed in claim 4, wherein the current sampling comparison module comprises a seventh resistor, an eighth resistor, a ninth resistor, a first power supply, a second optocoupler, a tenth resistor, a second power supply, a first comparator, an eleventh resistor, and an overcurrent threshold; the IGBT module comprises an IGBT;
one end of the seventh resistor and one end of the eighth resistor are both connected with the second end of the sixth resistor, the other end of the seventh resistor is connected with the second end of the second optocoupler, the collector of the second switching tube and the collector of the IGBT, the emitter of the IGBT is connected with the power supply module, the other end of the eighth resistor is connected with the first end of the second optocoupler and is connected with the first power supply through the ninth resistor, the third end of the second optocoupler is connected with the in-phase end of the first comparator and is connected with the second power supply and one end of the eleventh resistor through the tenth resistor, the inverting end of the first comparator is connected with the overcurrent threshold, and the output end of the first comparator is connected with the other end of the eleventh resistor and the overcurrent protection module.
6. The economical IGBT instantaneous overcurrent protection circuit according to claim 5, wherein the overcurrent protection module comprises a third optocoupler, a twelfth resistor, a thirteenth resistor, a third power supply, a second voltage regulator tube, a first power tube and a fourteenth resistor;
the first end of the third optocoupler is connected with the output end of the first comparator, the second end of the third optocoupler is grounded, the third end of the third optocoupler is connected with a third power supply through a twelfth resistor, the fourth end of the third optocoupler is connected with one end of a thirteenth resistor, the cathode of the second voltage regulator tube and the grid electrode of the first power tube, the other end of the thirteenth resistor and the anode of the second voltage regulator tube are grounded, the drain electrode of the first power tube is connected with the sampling module and the electric energy output module through a fourteenth resistor, and the source electrode of the first power tube is connected with the ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221960943.5U CN217935086U (en) | 2022-07-26 | 2022-07-26 | Economical IGBT instantaneous overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221960943.5U CN217935086U (en) | 2022-07-26 | 2022-07-26 | Economical IGBT instantaneous overcurrent protection circuit |
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| Publication Number | Publication Date |
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| CN217935086U true CN217935086U (en) | 2022-11-29 |
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| CN202221960943.5U Active CN217935086U (en) | 2022-07-26 | 2022-07-26 | Economical IGBT instantaneous overcurrent protection circuit |
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- 2022-07-26 CN CN202221960943.5U patent/CN217935086U/en active Active
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