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CN-115987062-B - Integrated drive circuit and switching power supply system

CN115987062BCN 115987062 BCN115987062 BCN 115987062BCN-115987062-B

Abstract

The application discloses an integrated driving circuit and a switching power supply system, which are applied to the technical field of power electronics and are used for solving the problems of poor reliability and small application range of the driving circuit in the prior art. The integrated driving circuit comprises a control module and at least two driving modules, wherein when the external power tube is in a follow current state, the control module generates a secondary control signal to enable the corresponding driving module to generate preset negative pressure in the first time, the driving module generates a three-level driving signal according to the main control signal sent by the control module and the preset negative pressure and sends the three-level driving signal to a grid electrode of the power tube, and when the external power tube is in a working state except the follow current state, the driving module generates a two-level driving signal according to the main control signal sent by the control module and sends the two-level driving signal to the grid electrode of the power tube. Therefore, the negative pressure in the three-level driving signal can effectively reduce peak pulse, improve the reliability of the integrated driving circuit, and enlarge the application range of the circuit by arranging at least two driving modules.

Inventors

  • GAO YUAN
  • LI XINYI
  • LIU CHANG

Assignees

  • 南方科技大学

Dates

Publication Date
20260508
Application Date
20221008

Claims (10)

  1. 1. An integrated driving circuit is characterized by comprising a control module and at least two driving modules; The first input end and the second input end of each driving module are respectively connected with two output ends in a plurality of output ends of the control module in a one-to-one correspondence manner, and the first output end and the second output end of each driving module are respectively connected with grid electrodes of two power tubes in an external plurality of power tubes in a one-to-one correspondence manner; the first voltage input end of each driving module is used as one bootstrap voltage end in a plurality of bootstrap voltage ends of the integrated driving circuit, the second voltage input end of each driving module is used as one switching node voltage end in a plurality of switching node voltage ends of the integrated driving circuit, the third voltage input end of each driving module is connected with the first voltage end of the integrated driving circuit, the fourth voltage input end of each driving module is connected with the second voltage end of the integrated driving circuit, each driving module is used for judging whether a preset negative pressure is generated at a first time according to a first auxiliary control signal received from the first input end, if yes, a three-level driving signal is generated according to a first main control signal and the preset negative pressure, if no, a two-level driving signal is generated according to the first main control signal, the two-level driving signal is transmitted to a grid electrode of an external power tube connected with the first output end, the driving module is also used for judging whether a second auxiliary control signal is generated at a second time from the second auxiliary control signal received from the first input end, if yes, a three-level driving signal is generated according to the first main control signal is generated to the second auxiliary control signal, if no, the three-level driving signal is generated to the grid electrode of the external power tube connected with the first output end, and the three-level driving signal is generated according to the second auxiliary control signal is generated at the second auxiliary negative pressure, if not, generating a double-level driving signal according to a second main control signal, and sending the double-level driving signal to a grid electrode of an external power tube connected with the second output end; The input end of the control module is connected with external waveform generation equipment, the control module is used for generating a first main control signal and a first auxiliary control signal, the first main control signal and the first auxiliary control signal are sent to the drive module through the first input end, a second main control signal and a second auxiliary control signal are generated, the second main control signal and the second auxiliary control signal are sent to the drive module through the second input end, wherein the first auxiliary control signal and the second auxiliary control signal are respectively used for controlling the drive module to generate preset negative pressure in the first time when an external power tube correspondingly connected with the drive module is in a follow current state, and the drive module is controlled not to generate preset negative pressure when the external power tube correspondingly connected with the drive module is in a working state other than the follow current state.
  2. 2. The integrated drive circuit of claim 1, wherein each of the drive modules comprises two drive sub-modules; A first end of a first driving sub-module of the two driving sub-modules is used as a first input end of the driving module, a second end of the first driving sub-module is used as a first output end of the driving module, and a third end and a fourth end of the first driving sub-module are respectively used as a first voltage input end and a second voltage input end of the driving module; The first end of a second driving sub-module in the two driving sub-modules is used as a second input end of the driving module, the second end of the second driving sub-module is used as a second output end of the driving module, and the third end and the fourth end of the second driving sub-module are respectively a third voltage input end and a fourth voltage input end of the driving module.
  3. 3. The drive circuit of claim 2, wherein each of the two drive sub-modules comprises a voltage adjustment module, a power adjustment module, a capacitor and three switches; The first end of the voltage regulation module is used as the first end of the driving sub-module, the second end of the voltage regulation module is connected with the third end of the driving sub-module, the third end of the voltage regulation module is respectively connected with the first end of a first switch of the three switches and the fourth end of the driving sub-module, the fourth end of the voltage regulation module is connected with the first end of the capacitor, the fifth end of the voltage regulation module is connected with the second end of the capacitor, and the sixth end of the voltage regulation module is connected with the first end of the power regulation module; The second end of the power adjustment module is connected with the fourth end of the voltage adjustment module, the third end of the power adjustment module is respectively connected with the fifth end of the voltage adjustment module and the first end of the second switch in the three switches, and the fourth end of the power adjustment module is connected with the second end of the driving sub-module; a second end of a first switch of the three switches is connected with a first end of the capacitor; a second end of a second switch of the three switches is connected with the second voltage input end; And a first end of a third switch of the three switches is connected with a third end of the driving sub-module, and a second end of the third switch of the three switches is connected with a first end of the capacitor.
  4. 4. A driving circuit as claimed in claim 3, wherein the second switch has the same switching state as the third switch, and the first switch has a switching state opposite to the switching state of the second switch.
  5. 5. A driving circuit as claimed in claim 3, wherein the control module comprises a logic gate circuit; the input end of the logic gate circuit is connected with the external waveform generating device, the first output end of the logic gate circuit is connected with the first end of the first driving sub-module, and the second output end of the logic gate circuit is connected with the first end of the second driving sub-module.
  6. 6. The drive circuit of claim 3, wherein the voltage adjustment module comprises a buck shift level shifter; The first end of the buck shift level device is used as the first end of the driving sub-module, the second end of the buck shift level device is connected with the third end of the driving sub-module, the third end of the buck shift level device is respectively connected with the first end of the first switch of the three switches and the fourth end of the driving sub-module, the fourth end of the buck shift level device is connected with the first end of the capacitor, the fifth end of the buck shift level device is connected with the second end of the capacitor, and the sixth end of the buck shift level device is connected with the first end of the power adjustment module.
  7. 7. The drive circuit of claim 3, wherein the power adjustment module comprises a buffer; The first end of the buffer is connected with the sixth end of the voltage regulation module, the second end of the buffer is connected with the fourth end of the voltage regulation module, the third end of the buffer is respectively connected with the fifth end of the voltage regulation module and the first end of the second switch of the three switches, and the fourth end of the buffer is connected with the first output end of the driving sub-module.
  8. 8. The drive circuit according to any of claims 1-7, further comprising at least two bootstrap power supply modules; The number of the bootstrap power supply modules is the same as that of the driving modules and the bootstrap power supply modules are arranged in a one-to-one correspondence manner, and aiming at each bootstrap power supply module in the at least two bootstrap power supply modules and the driving module which is arranged in a one-to-one correspondence manner with each bootstrap power supply module, a first end of the bootstrap power supply module is connected with a first voltage input end of the driving module, a second end of the bootstrap power supply module is connected with a second voltage input end of the driving module, a third end of the bootstrap power supply module is connected with a third voltage input end of the driving module, and each bootstrap power supply module in the at least two bootstrap power supply modules is used for providing a first voltage for the driving module which is arranged in a one-to-one correspondence manner with each bootstrap power supply module.
  9. 9. The drive circuit of claim 8, wherein each of the at least two bootstrap power blocks includes a bootstrap capacitor and a bootstrap switch; The first end of the bootstrap capacitor is connected with the first voltage input ends of the driving modules which are arranged in one-to-one correspondence with the bootstrap power supply modules, and the second end of the bootstrap capacitor is connected with the second voltage input ends of the driving modules which are arranged in one-to-one correspondence with the bootstrap power supply modules; the first end of the bootstrap switch is connected with the first voltage input ends of the driving modules which are arranged in one-to-one correspondence with the bootstrap power supply modules, and the second end of the bootstrap switch is connected with the third voltage input ends of the driving modules which are arranged in one-to-one correspondence with the bootstrap power supply modules.
  10. 10. A switching power supply system, comprising an integrated drive circuit, an auxiliary circuit, a waveform generator and a power supply main circuit as claimed in any one of claims 1 to 9, wherein an output end of the integrated drive circuit is connected with the power supply main circuit, and an input end of the integrated drive circuit is connected with the auxiliary circuit and the waveform generator respectively.

Description

Integrated drive circuit and switching power supply system Technical Field The present application relates to the field of power electronics, and in particular, to an integrated driving circuit and a switching power supply system. Background The GaN power tube has better conduction and switching performance due to smaller on-resistance and smaller grid charge. The GaN power tube is used in the switching power supply converter, so that the system efficiency and the power density can be effectively improved, and the GaN power tube has more remarkable advantages in high-power and high-frequency application occasions. The GaN power tube is mainly applied to the fields of power adapters, vehicle-mounted charging and the like, and has great potential advantages in application scenes of data center power supplies, 5G base station power supplies and the like. Currently, a switching power supply adopting a GaN power tube usually works at a higher switching frequency, and the voltage change rate (dv/dt) of a switching node of the GaN power tube can reach 100V/ns. Because the threshold voltage of the GaN device is lower, the reliability of the grid electrode is poor, and the parasitic capacitance of the GaN device can cause spike pulse to be generated on the grid electrode of the GaN device, so that misleading of the GaN power tube and even damage to the device are easily caused, the reliability of a driving circuit of the GaN device is a great challenge, and along with the development of electronic technology, a switching power supply system tends to be integrated, at present, the driving circuit is mainly based on discrete component design and cannot be suitable for different switching power supply topological structures after being integrated, and therefore, the driving circuit with high reliability and wide applicability is designed for different switching power supply topologies and is a main development direction of the driving circuit design. Disclosure of Invention The embodiment of the application provides a driving circuit, an integrated driving circuit and a switching power supply system, which are used for solving the problems of poor reliability and small application range of the driving circuit in the prior art. The technical scheme provided by the embodiment of the application is as follows: In one aspect, an embodiment of the present application provides an integrated driving circuit, including a control module and at least two driving modules; The first input end and the second input end of each driving module are respectively connected with two output ends in a plurality of output ends of the control module in a one-to-one correspondence manner, the first output end and the second output end of each driving module are respectively connected with grid electrodes of two power tubes in an external plurality of power tubes in a one-to-one correspondence manner, the first voltage input end of each driving module is used as one bootstrap voltage end in a plurality of bootstrap voltage ends of the integrated driving circuit, the second voltage input end of each driving module is used as one switch node voltage end in a plurality of switch node voltage ends of the integrated driving circuit, the third voltage input end of each driving module is connected with the first voltage end of the integrated driving circuit, the fourth voltage input end of each driving module is connected with the second voltage end of the integrated driving circuit, each driving module is used for judging whether preset negative pressure is generated in a first time according to a first auxiliary control signal received from the first input end, if the preset negative pressure is generated in the first auxiliary control signal, the three-level driving signal is generated to the grid electrodes of the external power tube connected with the first output end according to the first main control signal and the preset negative pressure, if the first auxiliary control signal is generated in the second auxiliary control signal is generated to the second auxiliary control signal is generated from the first auxiliary control signal, and if the preset negative pressure is generated in the second auxiliary control signal is generated to the first auxiliary control signal is generated to the external negative pressure signal is generated from the first auxiliary control signal which is generated to the first auxiliary control signal is received from the first auxiliary control signal, transmitting the dual-level driving signal to a grid electrode of an external power tube connected with the second output end; The input end of the control module is connected with the external waveform generation equipment, the control module is used for generating a first main control signal and a first auxiliary control signal, the first main control signal and the first auxiliary control signal are sent to the driving module through the first input end, a second