CN114421941A - IGBT grid digital driving system - Google Patents
IGBT grid digital driving system Download PDFInfo
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- CN114421941A CN114421941A CN202210058931.1A CN202210058931A CN114421941A CN 114421941 A CN114421941 A CN 114421941A CN 202210058931 A CN202210058931 A CN 202210058931A CN 114421941 A CN114421941 A CN 114421941A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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Abstract
The IGBT grid digital driving system comprises a conduction constant current source group, a disconnection constant current source group, a detection module and a control module. The conduction constant current source group comprises N constant current sources, and the conduction current values of the N constant current sources are in an equal ratio sequence. The turn-off constant current source group comprises M constant current sources, and the turn-off current values of the M constant current sources are in an equal ratio sequence. The control module is used for outputting control signals for controlling the conduction of the N conduction constant current sources or the turn-off of the M turn-off constant current sources. The control signal is a TTL digital signal and controls the on and on quantity of the on constant current source group or the off and off quantity of the off constant current source group according to the output signal of the detection module so as to control the current value when the grid of the IGBT is on or off. The IGBT grid digital driving system can enable a user to adopt the same driver hardware in the same system, and different software is matched with IGBT modules of different manufacturers, so that the full digitalization of the grid driving process is realized.
Description
Technical Field
The invention relates to the field of high-voltage power integrated circuits, in particular to an IGBT grid digital driving system.
Background
Under the background of energy conservation and emission reduction, environmental protection and more popular intelligent control, the power electronic technology plays an irreplaceable role in the development of various fields. The high-voltage power integrated circuit is more and more widely applied and mainly applied to the fields of automobile electronics, motor drive, display IC, audio integrated circuit, switching power supply and the like. Power devices are of great importance in power integrated circuits, and with the development of semiconductor technology, IGBTs become the main power output devices. The IGBT combines the advantages of BJTs and MOSFETs, has the characteristics of high switching speed, high voltage resistance, large current bearing capacity, good thermal stability and the like, and is widely applied to high-power application occasions. How the IGBT gate driving chip drives the IGBT better becomes a key for the stable and reliable operation of the circuit.
The size of the gate resistance of the IGBT greatly affects the performance of the switching electrical performance of the IGBT device, as shown in table 1. As a characteristic that the user wishes to reduce: eon, Eoff, on peak current, voltage spike, EMI noise, proper on peak current, off peak current, dv/dt, di/dt. As can be seen from table 1, the influence of the change in gate resistance on these characteristics is different, in a trade-off relationship, so selecting the appropriate gate resistance at different stages greatly affects the electrical performance exhibited by the IGBT.
TABLE 1 influence of gate resistance variation on IGBT switch electrical performance
As can be seen from table 1, when the gate resistance of the IGBT increases, not all the characteristic parameters of the IGBT increase, and at the same time, when the gate resistance of the IGBT decreases, not all the characteristic parameters of the IGBT decrease, so that it is undoubtedly sought to adjust the gate resistance of the IGBT in a timely manner according to the user's needs to improve the characteristic parameters of the IGBT and reduce the switching loss of the IGBT.
Disclosure of Invention
In view of the above, the present invention provides an IGBT gate digital driving system that can solve the above problems.
The IGBT grid digital driving system comprises a conducting constant current source group electrically connected with the grid of the IGBT, a disconnecting constant current source group electrically connected with the grid of the IGBT, a detection module electrically connected with the grid of the IGBT, and a control module electrically connected with the conducting constant current source group and the disconnecting constant current source group. The conduction constant current source group comprises N constant current sources, and the conduction current values of the N constant current sources are in an equal ratio sequence. The turn-off constant current source group comprises M constant current sources, and the turn-off current values of the M constant current sources are in an equal ratio sequence. The detection module is used for detecting the switching state and the conduction current of the grid of the IGBT. The control module is used for outputting control signals for controlling the conduction of the N conduction constant current sources or the turn-off of the M turn-off constant current sources. The control signal is a TTL digital signal and controls the on and on quantity of the on constant current source group or the off and off quantity of the off constant current source group according to the output signal of the detection module so as to control the current value when the grid of the IGBT is on or off.
Further, N equals M.
Further, both N and M are equal to 8.
Further, the common ratio of the equal ratio series is 2.
Further, each of the conduction constant current sources is used for supplying a constant current.
Further, each of the turn-off constant current sources is used to supply a constant current.
Further, when the gate of the IGBT is turned on, at least one on constant current source of the N on constant current source groups is turned on.
Further, when the gate of the IGBT is turned off, at least one of the turn-off constant current source groups of the M turn-off constant current source groups is turned off.
Compared with the prior art, the IGBT grid digital driving system provided by the invention has the advantages that the conducting constant current source group, the switching-off constant current source group and the control module are arranged, so that a user can adopt the same driver hardware in the same system, and different software is matched with IGBT modules of different manufacturers. Meanwhile, in the development stage of a user, the gate driving characteristics which are most suitable for the user system can be found by modifying the software conveniently. And finally, the IGBT grid digital driving system realizes the full digitalization of the grid driving process, and a user can control the driving characteristics of the grid through software at different stages of the IGBT switching-on and switching-off process according to requirements.
Drawings
Fig. 1 is a current curve diagram of a prior art IGBT switching process.
Fig. 2 is a schematic block diagram of an IGBT gate digital driving system provided by the present invention.
Fig. 3 is a circuit diagram of a turn-on constant current source provided in the IGBT gate digital driving system of fig. 2.
Fig. 4 is a circuit diagram of a turn-off constant current source provided in the IGBT gate digital driving system of fig. 2.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
The IGBT gate digital driving system is used to control the magnitude of the current flowing through the gate 100 of an IGBT when the IGBT is turned on and off and the slope of the current changing with time, thereby controlling the timely values of dv/dt and di/dt, and further controlling the characteristic parameters of the IGBT, such as reducing the voltage spike parameter and EMI noise parameter as much as possible. As is known, the switching process of the IGBT belongs to a capacitive load for the driver, that is, the process of charging the capacitor by the driver is an exponential curve, rather than a linear curve, and therefore, when there is a specific control requirement for dv/dt and di/dt, the switching process by controlling the gate resistance of the IGBT cannot be realized because the process of charging the capacitor by the gate resistance is an exponential curve. Therefore, it is also necessary to directly control the magnitude of the current applied to the gate 100 of the IGBT.
Fig. 1 shows a current curve of a switching process of an IGBT in the prior art. As is the on period at t1 and t2, the current change is linear during the on period as can be seen from the graph of fig. 1. And the periods at t4 and t5 are off periods in which the current change is also linear. Therefore, when the gate 100 of the IGBT is driven to turn on and off, the current flowing through the gate 100 of the IGBT should be made linear to control the timely values of dv/dt and di/dt, and thus the characteristic parameters of the IGBT.
As shown in fig. 2, it is a schematic block diagram of the IGBT gate digital driving system provided in the present invention. The IGBT grid digital driving system comprises a conducting constant current source group 10 electrically connected with a grid 100 of the IGBT, a disconnecting constant current source group 20 electrically connected with the grid 100 of the IGBT, a detection module 30 electrically connected with the grid 100 of the IGBT, and a control module 40 electrically connected with the conducting constant current source group 10 and the disconnecting constant current source group 20. It is contemplated that the IGBT gate digital driving system further includes other functional modules, such as electrical connection components, software loaded on the control module 40, etc., which are well known to those skilled in the art and will not be described in detail herein.
The conduction constant current source group 10 includes N conduction constant current sources connected in parallel, and each of the conduction constant current sources is configured to provide a constant current. In use, when the gate 100 of the IGBT is turned on, at least one on constant current source of the N on constant current source groups is turned on. As shown in fig. 3, it is a circuit diagram of N conduction constant current sources. The output current of each conduction constant current source can be maintained at a certain current value by setting the parameters of the electronic components in the circuit. In order to effectively control the magnitude of the output current values of the N conduction constant current sources and enable the output current values of at least two conduction constant current sources to be effectively controlled in a manner of adding together, the conduction current values of the N conduction constant current sources are in an equal ratio array. In this embodiment, the on-constant current source group 10 includes 8 on-constant current sources connected in parallel, and the on-current values output by the 8 on-constant current sources are 50mA, 100mA, 200mA, 400mA, 800mA, 1600mA, 3200mA, and 6400mA, respectively, that is, the common ratio of the geometric series is 2. Since the on-current of the gate of the IGBT is usually between 50mA and 12A, the on-current of the gate 100 of the IGBT can be accurately controlled by superimposing on each other the on-current values output from the plurality of on-constant current sources. Of course, it is conceivable that different numbers of the on constant current sources may be used for different IGBTs, i.e., N may be any value of an integer. However, 8 IGBTs are already sufficient for use.
The turn-off constant current source group 20 includes M turn-off constant current sources connected in parallel, and each of the turn-off constant current sources is configured to provide a constant current. In use, when the gate 100 of the IGBT is turned off, at least one of the M turn-off constant current source groups is turned off. As shown in fig. 4, it is a circuit diagram of M of the turn-off constant current sources. The output current of each turn-off constant current source can be maintained at a certain current value by setting the parameters of the electronic components in the circuit. The turn-off current values of the M turn-off constant current sources are in an equal ratio array with the turn-on constant current sources of the N. In this embodiment, the turn-off constant current source group 20 includes 8 turn-off constant current sources connected in parallel, and the turn-off current values output by the 8 turn-off constant current sources are respectively 50mA, 100mA, 200mA, 400mA, 800mA, 1600mA, 3200mA, and 6400mA, that is, the common ratio of the geometric series is 2. Meanwhile, the accurate control of the turn-off current of the gate 100 of the IGBT can be completed by superimposing the turn-off current values output by the plurality of turn-off constant current sources. It is contemplated that the value of M may or may not be equal to the value of N.
The detection module 30 is connected to the gate 100 of the IGBT and is used to detect the instantaneous current of the gate of the IGBT in different turn-on processes or turn-off processes, so the detection module 30 includes a current detection circuit. The current detection circuit itself should be the prior art, and is composed of electronic components such as commonly used resistors and triodes. The instantaneous current of the gate of the IGBT detected by the detection module 30 is transmitted to the control module 40.
The control module 40 is configured to output a control signal for controlling the on state of the N on constant current sources or the off state of the M off constant current sources. The control signal output by the control unit 40 is a TTL (Transistor Logic) digital signal. The TTL signal is a level signal, which means a signal represented by a level value. When data is represented in binary, the TTL level signal specifies that +5V is equivalent to logic "1" and 0V is equivalent to logic "0". Such a data communication and level regulation system is called a TTL signal system. In digital circuits, the level used by circuits formed by TTL electronic components is TTThe L level. Through the TTL digital signal, one or more of the conduction constant current sources can be turned on or one or more of the turn-off constant current sources can be turned off. Since TTL is a binary control signal, there is 2 for the on constant current source or the off constant current sourceNConduction mode or 2MAnd (4) a switching-off mode. In this embodiment, the control module 40 has 256 on modes and 256 off modes, so that the gate of the IGBT can be precisely controlled. It is well known to those skilled in the art that the TTL digital signal can be written into the control module 40 through dedicated software to control the on of the on constant current source set 10 or the off of the off constant current source 20.
Compared with the prior art, the IGBT grid digital driving system provided by the invention has the advantages that the conducting constant current source group 10, the switching-off constant current source group 20 and the control module 40 are arranged, so that a user can adopt the same driver hardware in the same system, and the IGBT modules of different manufacturers are matched through different software. Meanwhile, in the development stage of a user, the gate driving characteristics which are most suitable for the user system can be found by modifying the software conveniently. And finally, the IGBT grid digital driving system realizes the full digitalization of the grid driving process, and a user can control the driving characteristics of the grid through software at different stages of the IGBT switching-on and switching-off process according to requirements.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.
Claims (8)
1. An IGBT grid digital driving system is characterized in that: the IGBT grid digital driving system comprises a conducting constant current source group electrically connected with the grid of the IGBT, a disconnecting constant current source group electrically connected with the grid of the IGBT, a detection module electrically connected with the grid of the IGBT, and a control module electrically connected with the conducting constant current group and the disconnecting constant current source group, wherein the conducting constant current source group comprises N constant current sources, the conducting current values of the N constant current sources are in an equal ratio sequence, the disconnecting constant current source group comprises M constant current sources, the disconnecting current values of the M constant current sources are in an equal ratio sequence, the detection module is used for detecting the switching state and the conducting current of the grid of the IGBT, the control module is used for outputting control signals for controlling the conduction of the N conducting constant current sources or the disconnection of the M constant current sources, the control signals are TTL digital signals and control the conduction and the conduction number or the conduction number of the conducting constant current source group or the conduction number of the M constant current sources according to the output signals of the detection module And the turn-off and turn-off quantity of the turn-off constant current source group is used for controlling the current value when the grid of the IGBT is turned on or turned off.
2. The IGBT gate digital drive system of claim 1, wherein: n is equal to M.
3. The IGBT gate digital drive system of claim 1, wherein: both N and M equal 8.
4. The IGBT gate digital drive system of claim 1, wherein: the common ratio of the geometric series is 2.
5. The IGBT gate digital drive system of claim 1, wherein: each of the conduction constant current sources is used for providing a constant current.
6. The IGBT gate digital drive system of claim 1, wherein: each of the turn-off constant current sources is used for providing a constant current.
7. The IGBT gate digital drive system of claim 5, wherein: when the gate of the IGBT is turned on, at least one conduction constant current source of the N conduction constant current source groups is turned on.
8. The IGBT gate digital drive system of claim 7, wherein: when the grid of the IGBT is turned off, at least one turn-off constant current source in the M turn-off constant current source groups is turned off.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210058931.1A CN114421941A (en) | 2022-01-19 | 2022-01-19 | IGBT grid digital driving system |
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| CN202210058931.1A CN114421941A (en) | 2022-01-19 | 2022-01-19 | IGBT grid digital driving system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060181831A1 (en) * | 2005-02-16 | 2006-08-17 | Kabushiki Kaisha Toshiba | Gate drive circuit, semiconductor module and method for driving switching element |
| US20140055190A1 (en) * | 2011-06-09 | 2014-02-27 | Mitsubishi Electric Corporation | Gate drive circuit |
| CN205829454U (en) * | 2016-07-18 | 2016-12-21 | 南京埃斯顿自动控制技术有限公司 | A kind of intelligentized IGBT constant current driving device |
| CN110235365A (en) * | 2016-11-25 | 2019-09-13 | 埃克斯甘公司 | Power Circuit Switching Device |
| CN111313881A (en) * | 2018-12-11 | 2020-06-19 | 中电普瑞科技有限公司 | Method for improving anti-interference performance of IGBT driver |
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2022
- 2022-01-19 CN CN202210058931.1A patent/CN114421941A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060181831A1 (en) * | 2005-02-16 | 2006-08-17 | Kabushiki Kaisha Toshiba | Gate drive circuit, semiconductor module and method for driving switching element |
| US20140055190A1 (en) * | 2011-06-09 | 2014-02-27 | Mitsubishi Electric Corporation | Gate drive circuit |
| CN205829454U (en) * | 2016-07-18 | 2016-12-21 | 南京埃斯顿自动控制技术有限公司 | A kind of intelligentized IGBT constant current driving device |
| CN110235365A (en) * | 2016-11-25 | 2019-09-13 | 埃克斯甘公司 | Power Circuit Switching Device |
| CN111313881A (en) * | 2018-12-11 | 2020-06-19 | 中电普瑞科技有限公司 | Method for improving anti-interference performance of IGBT driver |
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