Driving circuit capable of turning off device and electronic equipment
By designing a driving circuit including a processing module, a positive voltage generation module, a negative voltage generation module, a selection module and an amplification module, the problem of poor adaptability in the prior art is solved, and flexible driving and optimized working performance for different shutdown devices is achieved.
Patent Information
- Application Number
- CN202411783643.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-04-29
AI Technical Summary
In the prior art, the driving circuit has poor adaptability and cannot adapt to the driving requirements of different shutdown devices at the same time.
A driving circuit including a processing module, a positive voltage generation module, a negative voltage generation module, a selection module and an amplification module are designed to dynamically adjust the gate voltage through multiple second level signals to adapt to the needs of different shutdown devices.
It realizes flexible driving of different shutdownable devices, optimizes on and off delays, shortens Miller platform time, reduces losses, and improves working stability.
Smart Images
Figure CN119906403A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of power electronics technology, and in particular to a drive circuit and electronic equipment for a device that can be turned off. Background Art
[0002] The on / off control and protection of turn-off devices such as insulated gate bipolar transistors (IGBTs) and metal-oxide-semiconductor field-effect transistors (MOSFETs) require a drive circuit. The drive circuit needs to provide gate resistance, gate voltage, etc. for the turn-off device, thereby turning the turn-off device on or off.
[0003] The gate voltage provided by the driving circuit provided by the related art for the turnable device can be modified by program configuration. Once the configuration is completed, the gate voltage remains fixed. However, different turnable devices require different gate voltages, and the same driving circuit cannot be used to drive different turnable devices. In other words, the driving circuit provided by the related art has poor adaptability. Summary of the invention
[0004] In order to solve the problem of poor adaptability in the prior art, the present application provides a driving circuit of a turnable device, which may include a processing module, a positive voltage generating module, a negative voltage generating module, a selection module and an amplification module.
[0005] Optionally, the processing module is used to: output a first level signal and multiple second level signals.
[0006] The positive voltage generating module is used for outputting a gate positive voltage to the selecting module according to a first part of the second level signals in the multiple second level signals.
[0007] The negative voltage generating module is used for outputting a gate negative voltage to the selecting module according to a second part of the second level signals in the multiple second level signals.
[0008] The selection module is used for: selecting a gate positive voltage or a gate negative voltage according to a first level signal and outputting it to the amplification module.
[0009] The amplification module is used to drive the turn-off device according to the positive gate voltage or the negative gate voltage.
[0010] In some possible implementations, the positive voltage generating module includes a first resistance unit, a second resistance unit, and a first current limiting resistor.
[0011] The first end of each of the first resistor unit and the second resistor unit is used as an input end of the positive voltage generating module, and both are connected to the control module. The second end of the first resistor unit is connected to the ground end, the third end of the first resistor unit is connected to the second end of the second resistor unit, the third end of the second resistor unit is connected to the first end of the first current limiting resistor, and the second end of the first current limiting resistor is used as an output end of the positive voltage generating module.
[0012] In some other possible implementations, the negative voltage generating module includes a first conversion unit, a first resistance unit, a second conversion unit, a second resistance unit, and a second current limiting resistor.
[0013] The first end of each of the first conversion unit and the second conversion unit is used as an input end of the negative voltage generating module, and both are connected to the control module. The second end of the first conversion unit is connected to the first end of the first resistor unit, the second end of the second conversion unit is connected to the first end of the second resistor unit, the second end of the first resistor unit is connected to the ground end, the third end of the first resistor unit is connected to the second end of the second resistor unit, the third end of the second resistor unit is connected to the first end of the second current limiting resistor, and the second end of the second current limiting resistor is used as an output end of the negative voltage generating module.
[0014] Exemplarily, the first resistor unit includes a first voltage-dividing resistor, a second voltage-dividing resistor, and a third voltage-dividing resistor.
[0015] The first end of the first voltage-dividing resistor serves as the first end of the first resistance unit, the second end of the first voltage-dividing resistor, the first end of the second voltage-dividing resistor and the first end of the third voltage-dividing resistor are connected, the second end of the second voltage-dividing resistor serves as the second end of the first resistance unit, and the second end of the third voltage-dividing resistor serves as the third end of the first resistance unit.
[0016] Optionally, the second resistor unit includes a fourth voltage-dividing resistor and a fifth voltage-dividing resistor.
[0017] The first end of the fourth voltage-dividing resistor serves as the first end of the second resistor unit. The second end of the fourth voltage-dividing resistor is connected to the first end of the fifth voltage-dividing resistor and serves as the second end of the second resistor unit. The second end of the fifth voltage-dividing resistor serves as the third end of the second resistor unit.
[0018] In some other possible implementations, the amplification module includes a conditioning unit and a power amplification unit connected in series.
[0019] The conditioning unit is used to output a control signal according to a positive gate voltage or a negative gate voltage.
[0020] The power amplifier unit is used to output a driving voltage to the switchable device according to a control signal.
[0021] In one example, the conditioning unit includes a sixth voltage-dividing resistor, a feedback resistor, and an amplifier.
[0022] The first end of the sixth voltage-dividing resistor is connected to the ground end, the second end of the sixth voltage-dividing resistor and the first end of the feedback resistor are both connected to the inverting input end of the amplifier, the second end of the feedback resistor is connected to the output end of the amplifier, and the output end of the amplifier serves as the output end of the conditioning unit. The non-inverting input end of the amplifier serves as the input end of the conditioning unit, and is used to receive the gate positive voltage or the gate negative voltage.
[0023] In another example, the power amplification unit includes a first power tube, a second power tube, and a gate resistor.
[0024] The control electrodes of the first power tube and the second power tube are respectively connected to the conditioning unit, the first electrode of the first power tube is used to receive the first working voltage, the second electrode of the first power tube, the first electrode of the second power tube and the first end of the gate resistor are connected, the second electrode of the second power tube is used to receive the second working voltage, and the second end of the gate resistor is connected to the turn-off device.
[0025] Among them, the first operating voltage is a positive voltage, and the second operating voltage is a negative voltage.
[0026] In some possible implementations, when the turn-off device is turned on, the driving circuit is used to:
[0027] When the turnable device is in the turn-on delay stage, the control module outputs a first gate positive voltage to the turnable device according to the current overshoot value of the turnable device through the positive voltage generation module, the selection module and the amplification module.
[0028] When the turnable device is in the current rising stage, the control module outputs a second gate positive voltage to the turnable device through the positive voltage generation module, the selection module, and the amplification module according to the current overshoot value of the turnable device and the preset current rising speed. The second gate positive voltage is less than the first gate positive voltage.
[0029] When the turnable device is in the current reverse recovery stage, the control module outputs a third gate positive voltage to the turnable device according to the reverse recovery current of the turnable device through the positive voltage generation module, the selection module, and the amplification module. The third gate positive voltage is less than the first gate positive voltage, and the third gate positive voltage is greater than the second gate positive voltage.
[0030] When the turnable device is fully turned on, the control module outputs a fourth gate positive voltage to the turnable device through the positive voltage generation module, the selection module, and the amplification module according to the conduction loss of the turnable device, wherein the fourth gate positive voltage is greater than the first gate positive voltage.
[0031] In some possible implementations, during the shutdown process of the turnable device, the driving circuit is used to:
[0032] When the turnable device is in the turn-off delay stage, the control module outputs a first gate negative voltage to the turnable device according to the voltage overshoot value of the turnable device through the negative voltage generation module, the selection module and the amplification module.
[0033] When the turnable device is in the voltage rising stage, the control module outputs a second gate positive voltage to the turnable device through the positive voltage generation module, the selection module, and the amplification module according to the voltage overshoot value of the turnable device and the preset voltage rising speed. The second gate positive voltage is greater than the first gate negative voltage.
[0034] When the turnable device is in the current falling stage, the control module outputs a third gate positive voltage to the turnable device according to a preset current falling speed through the positive voltage generation module, the selection module, and the amplification module, wherein the third gate positive voltage is greater than the second gate positive voltage.
[0035] When the turnable device is in the fully turned-off stage, the control module outputs a fourth gate negative voltage to the turnable device through the negative voltage generation module, the selection module, and the amplification module according to the turn-off loss of the turnable device, wherein the fourth gate negative voltage is less than the first gate negative voltage.
[0036] In another aspect, the present application also provides an electronic device, which may include a circuit board and a driving circuit of the above-mentioned turn-off device. The driving circuit may be arranged on the circuit board.
[0037] Compared with the prior art, the beneficial effects of this application are:
[0038] The driving circuit of the turnable device provided in the present application may include a processing module, a positive voltage generating module, a negative voltage generating module, a selection module and an amplification module. The processing module is used to output a first level signal and multiple second level signals. The positive voltage generating module is used to output a gate positive voltage to the selection module according to the first part of the second level signals in the multiple second level signals. The negative voltage generating module is used to output a gate negative voltage to the selection module according to the second part of the second level signals in the multiple second level signals. The selection module is used to select the gate positive voltage or the gate negative voltage to be output to the amplification module according to the first level signal. The amplification module is used to drive the turnable device according to the gate positive voltage or the gate negative voltage. It can be seen that the present application can provide an adjustable gate voltage for the turnable device through multiple second level signals, which can be used to drive different turnable devices, that is, the driving circuit provided by the present application has a wide range of applicability.
[0039] The driving circuit provided in the present application can provide an adjustable gate voltage for the turnable device through a positive voltage generating module and a negative voltage generating module, which can not only optimize the turn-on delay and turn-off delay of the turnable device, but also shorten the Miller platform time of the turnable device and reduce the loss of the turnable device.
[0040] The driving circuit provided in the present application can dynamically adjust the gate voltage, can fit the on / off curve of the turnable device, and can meet the response speed of the closed-loop control in the series-parallel application of the driven turnable device.
[0041] The driving circuit provided in the present application provides an adjustable gate positive voltage or gate negative voltage for the turnable device through a control module, a positive voltage generating module, a negative voltage generating module, a selection module and an amplification module, so that the turnable device can operate continuously and stably under rated operating conditions, that is, improve the working stability of the turnable device.
[0042] The driving circuit provided in the present application performs fine control on the turn-on transient gate voltage, collector voltage, turn-off transient gate voltage, collector voltage, etc. of the turn-off device, so that the turn-off device has a short switching time, small switching loss, and fast regulation response. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0044] Figure 1 A schematic structural diagram of a driving circuit of a device that can be turned off in an embodiment of the present application;
[0045] Figure 2 A schematic structural diagram of a positive voltage generating module in an embodiment of the present application;
[0046] Figure 3 is another schematic structural diagram of a positive voltage generating module in an embodiment of the present application;
[0047] Figure 4 is a schematic structural diagram of a negative voltage generating module in an embodiment of the present application;
[0048] Figure 5 is another schematic structural diagram of a negative voltage generating module in an embodiment of the present application;
[0049] Figure 6 is a schematic structural diagram of an amplification module in an embodiment of the present application;
[0050] Figure 7 It is a timing diagram of the gate voltage, collector voltage and collector current of the MOS tube in the conduction process in the embodiment of the present application;
[0051] Figure 8This is a timing diagram of the gate voltage of the MOS tube in the embodiment of the present application when a fault occurs during the conduction process;
[0052] Fig. 9 A timing diagram of the gate voltage, collector voltage and collector current of the first MOS tube driven in the embodiment of the present application;
[0053] Fig.10 1 is a timing diagram of the gate voltage, collector voltage and collector current of the second MOS tube driven in the embodiment of the present application. DETAILED DESCRIPTION
[0054] The technical solution in this application will be described below in conjunction with the accompanying drawings.
[0055] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.
[0056] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.
[0057] The present application provides a driving circuit for a device that can be turned off. The device that can be turned off can be a high-voltage, high-power silicon carbide device, such as an insulated gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), etc. The embodiment of the present application takes a MOS tube as an example.
[0058] like Figure 1 The driving circuit 10 includes a processing module 5 , a positive voltage generating module 1 , a negative voltage generating module 2 , a selecting module 3 and an amplifying module 4 .
[0059] Optionally, the processing module 5 is used to output a first level signal (which can be represented by IO_ctr) and multiple second level signals. Figure 1 As shown, the multiple second level signals can be divided into a first part of second level signals and a second part of second level signals. The first part of second level signals may include second level signals IO_11 to second level signals IO_1n. The second part of second level signals may include second level signals IO_21 to second level signals IO_2m. The first part of second level signals and the second part of second level signals may each include at least two second level signals.
[0060] The positive voltage generating module 1 is used to: generate a positive voltage according to the first part of the second level signals (there may be 2) in the multiple second level signals n The second level signal) outputs the gate positive voltage U + Give the selected module.
[0061] The negative voltage generating module 2 is used to: generate a negative voltage according to a second part of the second level signals (there may be 2 m A second level signal) outputs a negative gate voltage U - Give the selected module.
[0062] The selection module 3 is used to select the gate positive voltage U according to the first level signal IO_ctr. + Or negative gate voltage U - Output to the amplifier module 4. Among them, the gate positive voltage U + The range can be 0~V GEON , V GEON Indicates the maximum gate turn-on voltage, the gate positive voltage U + The minimum step voltage is V GEON / 2n. Negative gate voltage U - The range can be V GEOFF ~0, V GEOFF Indicates the minimum gate turn-off voltage, the gate negative voltage U - The minimum step voltage is V GEOFF / 2 m .
[0063] The amplification module 4 is used to: + Or negative gate voltage U - Drive the turn-off device (ie MOS tube).
[0064] Optionally, the control module 5 may be a microcontroller unit (MCU), a field programmable gate array (FPGA), a complex programmable logic device (CPLD), etc., which is not limited in the embodiments of the present application.
[0065] The selection module 3 may be a discrete device such as MOSFET, IGBT, triode, etc. The selection module 3 may also be an integrated circuit such as an analog switch, etc., which is not limited in the embodiment of the present application.
[0066] In some possible implementations, such as Figure 2 As shown, the positive voltage generating module 1 includes a first resistance unit 11, a second resistance unit 12 and a first current limiting resistor RO1.
[0067] The first end of each of the first resistor unit 11 and the second resistor unit 12 serves as the input end of the positive voltage generating module 1 (i.e. Figure 2 P11 and P12 in the control module 5 ( Figure 2 The second end of the first resistor unit 11 is connected to the ground end, the third end of the first resistor unit 11 is connected to the second end of the second resistor unit 12, the third end of the second resistor unit 12 is connected to the first end of the first current limiting resistor RO1, and the second end of the first current limiting resistor RO1 serves as the output end OUT1 of the positive voltage generating module 1.
[0068] Optionally, the positive voltage generating module 1 may further include a first resistance unit 11, n second resistance units 12 and a first current limiting resistor RO1, such as Figure 3 The first end of each of the n second resistor units 12 serves as the input end of the positive voltage generating module 1 (i.e. Figure 2 , P11, P12, . . . , P1n), the last second resistance unit 12 can be connected to the first end of the first current limiting resistor RO1, and the second end of the first current limiting resistor RO1 serves as the output end OUT1 of the positive voltage generating module 1.
[0069] In some other possible implementations, the negative voltage generating module 2 includes a first conversion unit 23 , a first resistance unit 21 , a second conversion unit 24 , a second resistance unit 22 , and a second current limiting resistor RO2 .
[0070] The first terminals of the first conversion unit 23 and the second conversion unit 24 are respectively used as the input terminals of the negative voltage generating module 2 (i.e. Figure 4 P21 and P22 in the control module ( Figure 4The second end of the first conversion unit 23 is connected to the first end of the first resistance unit 21, the second end of the second conversion unit 24 is connected to the first end of the second resistance unit 22, the second end of the first resistance unit 21 is connected to the ground, the third end of the first resistance unit 21 is connected to the second end of the second resistance unit 22, the third end of the second resistance unit 22 is connected to the first end of the second current limiting resistor RO2, and the second end of the second current limiting resistor RO2 serves as the output end OUT2 of the negative voltage generating module 1.
[0071] Optionally, the negative voltage generating module 2 may further include a first resistance unit 21, (m+1) conversion units, m second resistance units 22 and a second current limiting resistor RO2, such as Figure 5 As shown. The (m+1) conversion units may include a first conversion unit 23 and m second conversion units 24. The second to m second conversion units 24 are connected to the m second resistor units 22 in a one-to-one correspondence. The first end of each of the (m+1) conversion units serves as the input end of the negative voltage generating module 2 (i.e. Figure 5 P21, P22, P23, ..., P2(m+1)) in the control module ( Figure 5 The last second resistor unit 22 can be connected to the first end of the second current limiting resistor RO2, and the second end of the second current limiting resistor RO2 serves as the output end OUT2 of the negative voltage generating module 2.
[0072] Optionally, the structures of the first resistor unit 11 in the positive voltage generating module 1 and the first resistor unit 21 in the negative voltage generating module 2 may be the same or different. Similarly, the structures of the second resistor unit 12 in the positive voltage generating module 1 and the second resistor unit 22 in the negative voltage generating module 2 may be the same or different. In the embodiment of the present application, the first resistor unit 11 in the positive voltage generating module 1 and the first resistor unit 21 in the negative voltage generating module 2 have the same structure, and the second resistor unit 12 in the positive voltage generating module 1 and the second resistor unit 22 in the negative voltage generating module 2 have the same structure, which will be described in detail below.
[0073] Exemplary, reference Figures 2 to 5 The first resistance unit 11 / the first resistance unit 21 includes a first voltage-dividing resistor R1 , a second voltage-dividing resistor R2 and a third voltage-dividing resistor R3 .
[0074] The first end of the first voltage-dividing resistor R1 serves as the first end of the first resistance unit 11 / first resistance unit 21, the second end of the first voltage-dividing resistor R1, the first end of the second voltage-dividing resistor R2 and the first end of the third voltage-dividing resistor R3 are connected, the second end of the second voltage-dividing resistor R2 serves as the second end of the first resistance unit 11 / first resistance unit 21, and the second end of the third voltage-dividing resistor R3 serves as the third end of the first resistance unit 11 / first resistance unit 21.
[0075] Optional, reference Figures 2 to 5 , the second resistance unit 12 / the second resistance unit 22 may include a fourth voltage-dividing resistor R4 and a fifth voltage-dividing resistor R5.
[0076] The first end of the fourth voltage-dividing resistor R4 serves as the first end of the second resistor unit 12 / the second resistor unit 22. The second end of the fourth voltage-dividing resistor R4 is connected to the first end of the fifth voltage-dividing resistor R5 and serves as the second end of the second resistor unit 12 / the second resistor unit 22. The second end of the fifth voltage-dividing resistor R5 serves as the third end of the second resistor unit 12 / the second resistor unit 22.
[0077] In some other possible implementations, such as Figure 6 As shown, the amplification module 4 includes a conditioning unit 41 and a power amplification unit 42 connected in series.
[0078] The conditioning unit 41 is used to: + Or negative gate voltage U - Output control signal.
[0079] The power amplifier unit 42 is used to output a driving voltage to the MOS tube according to a control signal.
[0080] In one example, reference Figure 6 The conditioning unit 41 includes a sixth voltage-dividing resistor R6, a feedback resistor R0 and an amplifier Amp.
[0081] The first end of the sixth voltage-dividing resistor R6 is connected to the ground end, the second end of the sixth voltage-dividing resistor R6 and the first end of the feedback resistor R0 are both connected to the inverting input end of the amplifier Amp, the second end of the feedback resistor R0 is connected to the output end of the amplifier Amp, and the output end of the amplifier Amp serves as the output end of the conditioning unit 41. The non-inverting input end of the amplifier Amp serves as the input end of the conditioning unit 41, and is used to receive the gate positive voltage U + Or negative gate voltage U - .
[0082] In another example, reference Figure 6The power amplifier unit 42 includes a first power tube Q1, a second power tube Q2 and a gate resistor Rg. The first power tube Q1 and the second power tube Q2 may be triodes or MOS tubes. In the embodiment of the present application, the first power tube Q1 may be an NPN triode, and the second power tube Q2 may be a PNP triode.
[0083] The control electrodes of the first power tube Q1 and the second power tube Q2 are respectively connected to the conditioning unit 41, the first electrode (which may be a collector) of the first power tube Q1 is used to receive the first operating voltage VCC, the second electrode (which may be an emitter) of the first power tube Q1, the first electrode (which may be a collector) of the second power tube and the first end of the gate resistor Rg are connected, the second electrode (which may be an emitter) of the second power tube Q2 is used to receive the second operating voltage VEE, and the second end of the gate resistor Rg is connected to the MOS tube.
[0084] The first operating voltage VCC may be a positive voltage, and the second operating voltage VEE may be a negative voltage.
[0085] In some possible implementations, reference Figure 7 , when the MOS tube is turned on, the driving circuit 10 is used to:
[0086] When the MOS tube is in the opening delay stage (i.e. Figure 7 The control module 5 can output the first gate positive voltage Von-1 to the MOS tube through the positive voltage generating module 1, the selecting module 3 and the amplifying module 4 according to the current overshoot value of the MOS tube.
[0087] When the MOS tube is in the current rising stage (i.e. Figure 7 In the stage between time T2 and time T3 in the figure), the control module 5 outputs the second gate positive voltage Von-2 to the MOS tube according to the current overshoot value of the MOS tube and the preset current rising speed through the positive voltage generating module 1, the selecting module 3 and the amplifying module 4. The second gate positive voltage Von-2 is less than the first gate positive voltage Von-1.
[0088] When the MOS tube is in the current reverse recovery stage (i.e. Figure 7 In the stage between time T3 and time T4 in the figure), the control module 5 outputs the third gate positive voltage Von-3 to the MOS tube according to the reverse recovery current of the MOS tube through the positive voltage generation module 1, the selection module 3, and the amplification module 4. The third gate positive voltage Von-3 is less than the first gate positive voltage Von-1, and the third gate positive voltage Von-3 is greater than the second gate positive voltage Von-2.
[0089] In the MOS tube fully turned on stage (i.e. Figure 7In the stage between time T4 and time T5 in the figure), the control module 5 outputs a fourth gate positive voltage Von-4 to the MOS tube according to the conduction loss of the MOS tube through the positive voltage generation module 1, the selection module 3, and the amplification module 4. The fourth gate positive voltage Von-4 is greater than the first gate positive voltage Von-1.
[0090] In some possible implementations, when the MOS tube is turned off, the driving circuit 10 is used to:
[0091] When the MOS tube is in the shutdown delay stage (i.e. Figure 7 In the stage between time T6 and time T7 in the figure), the control module 5 outputs the first gate negative voltage Voff-1 to the MOS tube according to the voltage overshoot value of the MOS tube through the negative voltage generating module 2, the selecting module 3 and the amplifying module 4.
[0092] When the MOS tube is in the voltage rising stage (i.e. Figure 7 In the stage between time T7 and time T8 in the figure), the control module 5 outputs the second gate positive voltage Voff-2 to the MOS tube according to the voltage overshoot value of the MOS tube and the preset voltage rising speed through the positive voltage generating module 1, the selecting module 3 and the amplifying module 4. The second gate positive voltage Voff-2 is greater than the first gate negative voltage Voff-1.
[0093] When the MOS tube is in the current decreasing stage (i.e. Figure 7 In the stage between time T8 and time T9 in the figure), the control module 5 outputs the third gate positive voltage Voff-3 to the MOS tube according to the preset current drop speed through the positive voltage generation module 1, the selection module 3 and the amplification module 4. The third gate positive voltage Voff-3 is greater than the second gate positive voltage Voff-2.
[0094] When the MOS tube is in the fully turned-off stage (i.e. Figure 7 In the stage after the moment T9 in the figure), the control module 5 outputs the fourth gate negative voltage Voff-4 to the MOS tube according to the turn-off loss of the MOS tube through the negative voltage generation module 2, the selection module 3 and the amplification module 4. The fourth gate negative voltage Voff-4 is less than the first gate negative voltage Voff-1.
[0095] Figure 7In the figure, Vce represents the collector voltage of the MOS tube, Ic represents the collector current of the MOS tube, and Vg represents the gate voltage of the MOS tube, which can be the first gate positive voltage Von-1, the second gate positive voltage Von-2, the third gate positive voltage Von-3, the fourth gate positive voltage Von-4 and the first gate negative voltage Voff-1, the second gate negative voltage Voff-2, the third gate negative voltage Voff-3, and the fourth gate negative voltage Voff-4 mentioned above.
[0096] When an overcurrent fault or short circuit fault occurs in a MOS tube, the fault current rises quickly, the voltage drop of the MOS tube increases, and the loss of the MOS tube increases dramatically. It is necessary to perform a flexible shutdown of the MOS tube to prevent the current from dropping rapidly when the MOS tube is hard shut down, and the shutdown peak exceeds the safe working area of the MOS tube. Figure 8 As shown, the specific process is as follows:
[0097] 1) The processing module 5 can output the gate positive voltage Von-1 to the MOS tube through the selection module 3 and the amplification module 4.
[0098] 2) The processing module 5 can output the gate positive voltage Von-2 to the MOS tube through the selection module 3 and the amplification module 4. The gate positive voltage Von-2 is less than the gate positive voltage Von-1.
[0099] 3) The control module 5 outputs the gate positive voltage Von-3 to the MOS tube through the selection module 3 and the amplification module 4. The gate positive voltage Von-3 is less than the gate positive voltage Von-1, and the gate positive voltage Von-3 is greater than the gate positive voltage Von-2.
[0100] 4) The control module 5 outputs the gate positive voltage Von-4 to the MOS tube through the selection module 3 and the amplification module 4. The gate positive voltage Von-4 is greater than the gate positive voltage Von-1.
[0101] 5) The MOS tube is not fully turned on, but an overcurrent fault or a short circuit fault occurs. Therefore, the control module 5 outputs a gate positive voltage Voff-a to the MOS tube through the selection module 3 and the amplification module 4.
[0102] 6) The control module 5 outputs the gate positive voltage Voff-b to the MOS tube through the selection module 3 and the amplification module 4. The gate positive voltage Voff-b is smaller than the gate negative voltage Voff-a.
[0103] 7) The control module 5 outputs the gate negative voltage Voff-c to the MOS tube through the selection module 3 and the amplification module 4 to shorten the turn-off delay. The gate negative voltage Voff-c is smaller than the gate negative voltage Voff-b.
[0104] 8) The control module 5 outputs the gate voltage Voff-d to the MOS tube through the selection module 3 and the amplification module 4 to control the current drop rate and limit the voltage overshoot. The gate voltage Voff-d is greater than the gate negative voltage Voff-c.
[0105] 9) The control module 5 outputs the gate negative voltage Voff-e to the MOS tube through the selection module 3 and the amplification module 4, so as to realize the safe and reliable shutdown of the MOS tube. The gate negative voltage Voff-e is less than the gate negative voltage Voff-c.
[0106] In some embodiments, two driving circuits may be used to drive the first MOS transistor and the second MOS transistor respectively. The first MOS transistor and the second MOS transistor may be connected in series or in parallel. The specific driving process is described below.
[0107] like Fig. 9 and Fig.10 As shown, in the turn-on delay stage, the first MOS tube adopts a larger gate positive voltage Von-a1, and the second MOS tube adopts a larger gate positive voltage Von-b1. At this moment, the gate positive voltage Von-a1 is equal to the gate positive voltage Von-b1. When the first MOS tube is turned on first, the second MOS tube is not turned on at this time. At this moment, the driving voltage Von-offset of the second MOS tube is changed, and Von-offset can be greater than the gate positive voltage Von-b1. According to the preset current rising speed, the gate positive voltage Von-a1 is reduced to the gate positive voltage Von-a2, and the gate positive voltage Von-b1 is reduced to the gate positive voltage Von-b2. According to the reverse recovery current of the first MOS tube and the second MOS tube, the gate positive voltage Von-a2 is increased to the gate positive voltage Von-a3, and the gate positive voltage Von-b2 is increased to the gate positive voltage Von-b3. According to the conduction losses of the first MOS transistor and the second MOS transistor, the gate positive voltage Von-a3 is increased to the gate positive voltage Von-a4, and the gate positive voltage Von-b3 is increased to the gate positive voltage Von-b4.
[0108] By detecting that the first MOS tube is in the conduction delay stage, the driving voltage of the second MOS tube can be adjusted once or multiple times after one clock cycle to reduce the turn-on delay of the second MOS tube, so as to achieve the purpose of current balancing in parallel and voltage balancing in series between the second MOS tube and the first MOS tube. The embodiment of the present application can achieve ns-level regulation by changing the voltage in a resistor matrix manner.
[0109] like Fig. 9 and Fig.10, during the shutdown delay stage, the first MOS transistor uses a smaller gate negative voltage Voff-a1, and the second MOS transistor uses a smaller gate negative voltage Voff-b1. At this moment, the gate negative voltage Voff-a1 is equal to the gate negative voltage Voff-b1. The gate negative voltage Voff-a1 is increased to the gate positive voltage Voff-a2, and the gate negative voltage Voff-b1 is increased to the gate positive voltage Voff-b2. When the second MOS transistor is turned off first, the first MOS transistor has not started to turn off at this time. At this moment, the driving voltage of the first MOS transistor is changed to a lower driving voltage Voff-offset of the first MOS transistor, and Voff-offset is less than the gate positive voltage Voff-a2. According to the preset voltage rise speed, Voff-offset is increased to the gate positive voltage Voff-a3, and the gate positive voltage Voff-b2 is decreased to the gate positive voltage Voff-b3. According to the current decrease speed, the gate positive voltage Voff-a3 is decreased to the gate negative voltage Voff-a4, and the gate positive voltage Voff-b3 is decreased to the gate negative voltage Voff-b4.
[0110] By detecting that the second MOS tube is in the shutdown delay stage, the driving voltage of the first MOS tube can be adjusted once or more after one clock cycle to reduce the shutdown delay of the first MOS tube, so as to achieve the purpose of current balancing in parallel and voltage balancing in series of the second MOS tube and the first MOS tube. The embodiment of the present application can achieve ns-level regulation by changing the voltage in a resistor matrix manner.
[0111] The embodiment of the present application further provides an electronic device, which may include a circuit board and a driving circuit of the above-mentioned turn-off device. The driving circuit may be arranged on the circuit board.
[0112] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.
Claims
1. A driving circuit for a device that can be turned off, characterized in that: It includes a processing module, a positive voltage generating module, a negative voltage generating module, a selecting module and an amplifying module; The processing module is used to: output a first level signal and multiple second level signals; The positive voltage generating module is used to: output a gate positive voltage to the selecting module according to a first part of the second level signals in the multiple second level signals; The negative voltage generating module is used to: output a gate negative voltage to the selecting module according to a second part of the second level signals in the multiple second level signals; The selection module is used to: select the gate positive voltage or the gate negative voltage according to the first level signal and output it to the amplification module; The amplification module is used to drive the turn-off device according to the positive gate voltage or the negative gate voltage.
2. The driving circuit according to claim 1, characterized in that: The positive voltage generating module comprises a first resistance unit, a second resistance unit and a first current limiting resistor; The first end of each of the first resistance unit and the second resistance unit serves as the input end of the positive voltage generating module, and both are connected to the control module; the second end of the first resistance unit is connected to the ground end, the third end of the first resistance unit is connected to the second end of the second resistance unit, the third end of the second resistance unit is connected to the first end of the first current limiting resistor, and the second end of the first current limiting resistor serves as the output end of the positive voltage generating module.
3. The driving circuit according to claim 2, characterized in that: The negative voltage generating module comprises a first conversion unit, a first resistance unit, a second conversion unit, a second resistance unit and a second current limiting resistor; The first end of each of the first conversion unit and the second conversion unit serves as an input end of the negative voltage generating module, and both are connected to the control module; the second end of the first conversion unit is connected to the first end of the first resistance unit, the second end of the second conversion unit is connected to the first end of the second resistance unit, the second end of the first resistance unit is connected to the ground end, the third end of the first resistance unit is connected to the second end of the second resistance unit, the third end of the second resistance unit is connected to the first end of the second current limiting resistor, and the second end of the second current limiting resistor serves as an output end of the negative voltage generating module.
4. The driving circuit according to claim 3, characterized in that: The first resistor unit includes a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor; The first end of the first voltage-dividing resistor serves as the first end of the first resistance unit, the second end of the first voltage-dividing resistor, the first end of the second voltage-dividing resistor and the first end of the third voltage-dividing resistor are connected, the second end of the second voltage-dividing resistor serves as the second end of the first resistance unit, and the second end of the third voltage-dividing resistor serves as the third end of the first resistance unit.
5. The driving circuit according to claim 3, characterized in that: The second resistance unit includes a fourth voltage-dividing resistor and a fifth voltage-dividing resistor; The first end of the fourth voltage-dividing resistor serves as the first end of the second resistance unit; the second end of the fourth voltage-dividing resistor is connected to the first end of the fifth voltage-dividing resistor and serves as the second end of the second resistance unit; the second end of the fifth voltage-dividing resistor serves as the third end of the second resistance unit.
6. The driving circuit according to claim 1, characterized in that: The amplification module includes a conditioning unit and a power amplification unit connected in series; The conditioning unit is used to: output a control signal according to the positive gate voltage or the negative gate voltage; The power amplification unit is used to output a driving voltage to the switchable device according to the control signal.
7. The driving circuit according to claim 6, characterized in that: The conditioning unit includes a sixth voltage-dividing resistor, a feedback resistor and an amplifier; The first end of the sixth voltage-dividing resistor is connected to the ground end, the second end of the sixth voltage-dividing resistor and the first end of the feedback resistor are both connected to the inverting input end of the amplifier, the second end of the feedback resistor is connected to the output end of the amplifier, and the output end of the amplifier serves as the output end of the conditioning unit; the non-inverting input end of the amplifier serves as the input end of the conditioning unit, and is used to receive the gate positive voltage or the gate negative voltage.
8. The driving circuit according to claim 6, characterized in that: The power amplification unit includes a first power tube, a second power tube and a gate resistor; The control electrodes of the first power tube and the second power tube are respectively connected to the conditioning unit, the first electrode of the first power tube is used to receive a first working voltage, the second electrode of the first power tube, the first electrode of the second power tube and the first end of the gate resistor are connected, the second electrode of the second power tube is used to receive a second working voltage, and the second end of the gate resistor is connected to the turnable device; Wherein, the first operating voltage is a positive voltage, and the second operating voltage is a negative voltage.
9. The driving circuit according to claim 1, characterized in that: The driving circuit is used for: When the turnable device is in the turn-on delay stage, the control module outputs a first gate positive voltage to the turnable device according to the current overshoot value of the turnable device through the positive voltage generation module, the selection module and the amplification module; When the turnable device is in the current rising stage, the control module outputs a second gate positive voltage to the turnable device according to the current overshoot value of the turnable device and the preset current rising speed, through the positive voltage generating module, the selecting module and the amplifying module; wherein the second gate positive voltage is less than the first gate positive voltage; When the turnable device is in the current reverse recovery stage, the control module outputs a third gate positive voltage to the turnable device according to the reverse recovery current of the turnable device through the positive voltage generation module, the selection module, and the amplification module; wherein the third gate positive voltage is less than the first gate positive voltage, and the third gate positive voltage is greater than the second gate positive voltage; In the fully turned-on stage of the turnable device, the control module outputs a fourth gate positive voltage to the turnable device based on the conduction loss of the turnable device and through the positive voltage generating module, the selecting module and the amplifying module; wherein the fourth gate positive voltage is greater than the first gate positive voltage.
10. The driving circuit according to claim 1, characterized in that: The driving circuit is used for: When the turnable device is in the turn-off delay stage, the control module outputs a first gate negative voltage to the turnable device according to the voltage overshoot value of the turnable device and through the negative voltage generating module, the selecting module and the amplifying module; When the turnable device is in a voltage rising stage, the control module outputs a second gate positive voltage to the turnable device according to the voltage overshoot value of the turnable device and a preset voltage rising speed, through the positive voltage generating module, the selecting module and the amplifying module; wherein the second gate positive voltage is greater than the first gate negative voltage; When the turnable device is in the current decreasing stage, the control module outputs a third gate positive voltage to the turnable device according to a preset current decreasing speed through the positive voltage generating module, the selecting module and the amplifying module; wherein the third gate positive voltage is greater than the second gate positive voltage; When the turnable device is in the fully turned-off stage, the control module outputs a fourth gate negative voltage to the turnable device based on the turn-off loss of the turnable device and through the negative voltage generating module, the selecting module and the amplifying module; wherein the fourth gate negative voltage is less than the first gate negative voltage.
11. An electronic device, characterized in that: It comprises a circuit board and a driving circuit as claimed in any one of claims 1 to 10; the driving circuit is arranged on the circuit board.