CN-116192119-B - Driving circuit, driving system and driving method

CN116192119BCN 116192119 BCN116192119 BCN 116192119BCN-116192119-B

Abstract

The embodiment of the invention relates to the technical field of power management circuits, in particular to a driving circuit, a driving system and a driving method. The driving circuit comprises a plurality of level shifting modules, clamping modules and driving modules which are sequentially cascaded, wherein each clamping module comprises a plurality of clamping submodules which are in one-to-one correspondence with the level shifting modules, each clamping submodule is used for providing corresponding clamping voltage for each level shifting module, each level shifting module is used for converting a control signal received by the input end of the current level shifting module into a control signal with a higher level so as to convert a first control signal and a second control signal into control signals with level gradually increasing through each level shifting module, and the driving module is used for outputting the driving signals to an external power switch according to the control signals output by the level shifting module of the last stage. The driving circuit of the scheme can be suitable for a power management circuit with higher working voltage.

Inventors

WU JIANHUI
GUO YANG

Assignees

浙江航芯源集成电路科技有限公司

Dates

Publication Date: 20260505
Application Date: 20230117

Claims (10)

1. The driving circuit is characterized by comprising a plurality of level shift modules, clamping modules and driving modules which are sequentially cascaded, wherein each clamping module comprises a plurality of clamping submodules which are in one-to-one correspondence with the level shift modules; The output end of each clamping submodule is respectively connected to the corresponding level shift module, and each clamping submodule is used for providing corresponding clamping voltage for each level shift module; The two input ends of each level shift module of the next stage are respectively connected with the two output ends of the level shift module of the previous stage, the two input ends of the level shift module of the first stage are respectively connected with a first control signal and a second control signal, the two output ends of the level shift module of the last stage are respectively connected with the two input ends of the driving module, each level shift module is used for converting the control signal received by the input end of the current level shift module into a control signal of a higher level so as to convert the first control signal and the second control signal into control signals with the level gradually increased by each level shift module in sequence, wherein the high side end of the level shift module of the last stage is connected with the working voltage provided by an external power supply, and the voltage of the high side end of the level shift module of each stage gradually increases; The low side end of the driving module is connected to the clamping sub-module of the last stage, two input ends of the input end of the driving module are respectively connected to two output ends of the level shift module of the last stage, the output end of the driving module is connected to an external power switch, and the driving module is used for outputting driving signals to the external power switch according to control signals output by the level shift module of the last stage.
2. The driving circuit according to claim 1, wherein the level shift module comprises an upper driving MOS transistor and a lower driving MOS transistor, the upper driving MOS transistor and the lower driving MOS transistor being different in kind; When the clamping submodule comprises a first clamping branch circuit for providing a first clamping voltage for the upper driving MOS tube, the upper driving MOS tube and the lower driving MOS tube in the level shift module are both high-voltage MOS tubes.
3. The driving circuit according to claim 2, wherein when the power switch is a PMOS transistor, the upper driving MOS transistor in the level shift module is a high voltage PMOS transistor, and the lower driving MOS transistor is a high voltage NMOS transistor; the level shift module comprises a PMOS tube M4, an NMOS tube M5, an upper driving tube M8, an upper driving tube M9, a lower driving tube M13 and a lower driving tube M14; The grid electrode of the PMOS tube M4 is connected to the drain electrode of the NMOS tube M5 and the source electrode connecting line of the upper driving tube M9, the source electrode is connected to the high side end of the level shift module, and the drain electrode is connected to the grid electrode of the NMOS tube M5 and the source electrode connecting line of the upper driving tube M8; the source electrode of the NMOS tube M5 is connected to the high side end of the level shift module; the grid electrode of the upper driving tube M8 is connected with a first clamping voltage corresponding to the clamping sub-module, the drain electrode of the upper driving tube M13 is connected with the drain electrode of the lower driving tube M13, and the source electrode is used as a first output end of the level shift module; the grid electrode of the upper driving tube M9 is connected with a first clamping voltage corresponding to the clamping sub-module, the drain electrode of the upper driving tube M14 is connected with the drain electrode of the lower driving tube M14, and the source electrode is used as a second output end of the level shift module; The grid of the lower driving tube M13 is a first input end of the level shift module, and the source electrode of the lower driving tube M13 is connected with the low side end of the level shift module; the gate of the lower driving tube M14 is the second input end of the level shift module, and the source is connected to the low side end of the level shift module.
4. The driving circuit according to claim 2, wherein the first clamp branch comprises a regulator tube D1 and a resistor R1; the cathode of the voltage stabilizing tube D1 is connected with the high side end of the level shift module, the anode of the voltage stabilizing tube D1 is connected with one end of the resistor R1, and the anode is used as the output end of the first clamping branch circuit and used for outputting the first clamping voltage; And the other end of the resistor R1 is connected with the low side end of the level shift module.
5. The drive circuit of claim 2, wherein when the clamping submodule includes a first clamping leg for providing a first clamping voltage to the upper drive MOS transistor and a second clamping leg for providing a second clamping voltage to the lower drive MOS transistor, both the upper drive MOS transistor and the lower drive MOS transistor in the level shift module are low voltage MOS transistors.
6. The driving circuit according to claim 5, wherein when the power switch is a PMOS transistor, the upper driving MOS transistor in the level shift module is a low-voltage PMOS transistor, and the lower driving MOS transistor is a low-voltage NMOS transistor; The level shift module comprises a PMOS tube M4, an NMOS tube M5, an upper driving tube M8, an upper driving tube M9, a lower driving tube M11, a lower driving tube M12, a lower driving tube M13 and a lower driving tube M14; The grid electrode of the PMOS tube M4 is connected to the drain electrode of the NMOS tube M5 and the source electrode connecting line of the upper driving tube M9, the source electrode is connected to the high side end of the level shift module, and the drain electrode is connected to the grid electrode of the NMOS tube M5 and the source electrode connecting line of the upper driving tube M8; the source electrode of the NMOS tube M5 is connected to the high side end of the level shift module; The grid electrode of the upper driving tube M8 is connected with a first clamping voltage corresponding to the clamping sub-module, the drain electrode of the upper driving tube M11 is connected with the drain electrode of the lower driving tube M11, and the source electrode is used as a first output end of the level shift module; The grid electrode of the upper driving tube M9 is connected with a first clamping voltage corresponding to the clamping sub-module, the drain electrode of the upper driving tube M12 is connected with the drain electrode of the lower driving tube M, and the source electrode is used as a second output end of the level shift module; The grid electrode of the lower driving tube M11 is connected with a second clamping voltage corresponding to the clamping sub-module, the source electrode of the lower driving tube M11 is connected with the drain electrode of the lower driving tube M13, and the lower driving tube M11 is used for controlling the grid source voltage of the lower driving tube M13 according to the second clamping voltage; The grid electrode of the lower driving tube M12 is connected with a second clamping voltage corresponding to the clamping sub-module, the source electrode of the lower driving tube M12 is connected with the drain electrode of the lower driving tube M14, and the lower driving tube M12 is used for controlling the grid source voltage of the lower driving tube M14 according to the second clamping voltage; The grid of the lower driving tube M13 is a first input end of the level shift module, and the source electrode of the lower driving tube M13 is connected with the low side end of the level shift module; the gate of the lower driving tube M14 is the second input end of the level shift module, and the source is connected to the low side end of the level shift module.
7. The driving circuit according to claim 5, wherein the first clamp branch comprises a regulator tube D1 and a resistor R1; the cathode of the voltage stabilizing tube D1 is connected with the high side end of the level shift module, the anode of the voltage stabilizing tube D1 is connected with one end of the resistor R1, and the anode is used as the output end of the first clamping branch circuit and used for outputting the first clamping voltage; The other end of the resistor R1 is connected with the low side end of the level shift module; The second clamping branch circuit comprises a resistor R2 and a voltage stabilizing tube D2; one end of the resistor R2 is connected with the high side end of the level shift module, and the other end of the resistor R2 is connected with the cathode of the voltage stabilizing tube D2; And the anode of the voltage stabilizing tube D2 is connected with the low side end of the level shift module, and is used as the output end of the second clamping branch circuit and used for outputting the second clamping voltage.
8. The driving circuit according to claim 1, wherein the driving module comprises a PMOS tube M2, a PMOS tube M3, an NMOS tube M6 and an NMOS tube M7; The grid electrode of the PMOS tube M2 is connected with the grid electrode of the NMOS tube M6, the drain electrode of the PMOS tube M6 is connected with the drain electrode of the NMOS tube M6, the source electrode of the PMOS tube M2 is connected with the high side end of the level shift module of the last stage, the grid electrode of the PMOS tube M2 is used as one input end of the driving module and is connected with the second output end of the level shift module of the last stage, and the drain electrode of the PMOS tube M2 is used as one output end of the driving module and is connected with the power switch; The grid electrode of the PMOS tube M3 is connected with the grid electrode of the NMOS tube M7, the drain electrode of the PMOS tube M7 is connected with the drain electrode of the NMOS tube M7, the source electrode of the PMOS tube M3 is connected with the high side end of the level shift module of the last stage, the grid electrode of the PMOS tube M3 is used as the other input end of the driving module and is connected with the first output end of the level shift module of the last stage, and the drain electrode of the PMOS tube M3 is used as the other output end of the driving module and is connected with the power switch; the source electrode of the NMOS tube M6 is connected with the first clamping voltage of the clamping sub-module of the last stage; And the source electrode of the NMOS tube M7 is connected with the first clamping voltage of the clamping sub-module of the last stage.
9. A drive system comprising a power supply, a power switch and a drive circuit according to any one of claims 1-8; The power supply is respectively connected with the driving circuit and the power switch, and is used for providing working voltages for the driving circuit and the power switch so that the driving circuit outputs driving signals to the power switch to control the working state of the power switch.
10. A driving method based on the driving circuit according to any one of claims 1 to 8, comprising: providing a corresponding clamping voltage for a corresponding level shift module by utilizing each clamping sub-module in the clamping module; Based on the clamping voltage of each clamping sub-module and the working voltage provided by an external power supply, utilizing a multi-stage level shift module to sequentially convert a first control signal and a second control signal received by the level shift module at a first stage into control signals with level gradually increased, wherein the high side end of the level shift module at a last stage is connected with the working voltage, the voltage of the high side end of the level shift module at each stage gradually increased, and the voltage of the high side end of the level shift module at each stage outside the level shift module at the last stage is lower than the working voltage; The driving module outputs a driving signal to an external power switch according to the control signal output by the last-stage level shift module so as to control the working state of the power switch.

Description

Driving circuit, driving system and driving method Technical Field The embodiment of the invention relates to the technical field of power management circuits, in particular to a driving circuit, a driving system and a driving method. Background The level shift circuit in the driving circuit is mainly used for converting a low-voltage control signal into a high-voltage driving signal so as to control the on and off of an external power switch (MOS tube). In order to ensure that the driving circuit works normally, the working voltage input by the power supply cannot be larger than the drain-source withstand voltage of all driving tubes in the driving circuit, so that the traditional driving circuit cannot be suitable for a power management circuit with higher working voltage. Therefore, a new driving circuit is needed. Disclosure of Invention In order to solve the problem that a traditional driving circuit cannot be suitable for a power management circuit with higher working voltage, the embodiment of the invention provides a driving circuit, a driving system and a driving method. In a first aspect, the embodiment of the invention provides a driving circuit, which comprises a plurality of level shift modules, clamping modules and driving modules, wherein the level shift modules, the clamping modules and the driving modules are sequentially cascaded; The output end of each clamping submodule is respectively connected to the corresponding level shift module, and each clamping submodule is used for providing corresponding clamping voltage for each level shift module; The two input ends of each level shift module of the next stage are respectively connected with the two output ends of the level shift module of the previous stage, the two input ends of the level shift module of the first stage are respectively connected with a first control signal and a second control signal, the two output ends of the level shift module of the last stage are respectively connected with the two input ends of the driving module, each level shift module is used for converting the control signal received by the input end of the current level shift module into a control signal of a higher level so as to convert the first control signal and the second control signal into control signals with the level gradually increased by each level shift module in sequence, wherein the high side end of the level shift module of the last stage is connected with the working voltage provided by an external power supply, and the voltage of the high side end of the level shift module of each stage gradually increases; The low side end of the driving module is connected to the clamping sub-module of the last stage, two input ends of the input end of the driving module are respectively connected to two output ends of the level shift module of the last stage, the output end of the driving module is connected to an external power switch, and the driving module is used for outputting driving signals to the external power switch according to control signals output by the level shift module of the last stage. In a second aspect, the embodiment of the invention also provides a driving system, which comprises a power supply, a power switch and the driving circuit of any embodiment of the specification; The power supply is respectively connected with the driving circuit and the power switch, and is used for providing working voltages for the driving circuit and the power switch so that the driving circuit outputs driving signals to the power switch to control the working state of the power switch. In a third aspect, an embodiment of the present invention further provides a driving method based on the driving circuit described in any one of the embodiments of the present specification, including: providing a corresponding clamping voltage for a corresponding level shift module by utilizing each clamping sub-module in the clamping module; Based on the clamping voltage of each clamping sub-module and the working voltage provided by an external power supply, utilizing a multi-stage level shift module to sequentially convert a first control signal and a second control signal received by the level shift module at a first stage into control signals with level gradually increased, wherein the high side end of the level shift module at a last stage is connected with the working voltage, the voltage of the high side end of the level shift module at each stage gradually increased, and the voltage of the high side end of the level shift module at each stage outside the level shift module at the last stage is lower than the working voltage; The driving module outputs a driving signal to an external power switch according to the control signal output by the last-stage level shift module so as to control the working state of the power switch. The embodiment of the invention provides a driving circuit, a driving system and a driving method, wherein each clamping sub-module in a