Driving circuit, multilateral bridge circuit, chip and electronic device

Abstract

The invention relates to the technical field of driving circuits, and discloses a driving circuit, a multilateral bridge circuit, a chip and electronic equipment. The driving circuit comprises a signal generation module and at least one switch module. Wherein the switch module comprises a first switch module, the first switch module comprises a first high-voltage switch tube and a first low-voltage switch tube, and the signal generation module is used for outputting a first signal to the first high-voltage switch tube and outputting a second signal to the first low-voltage switch tube; according to the first signal and the second signal, in each conduction period of the first switch module, the conduction moment of the first high-voltage switch tube is earlier than the conduction moment of the first low-voltage switch tube, and the turn-off moment of the first high-voltage switch tube is later than the turn-off moment of the first low-voltage switch tube, so that the switch tubes can be prevented from being broken down by overvoltage; and the conduction impedance of the first switch module can be reduced, and the efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of drive circuits, and in particular to a drive circuit, a multilateral bridge circuit, a chip and an electronic device. Background Art

[0002] The H-bridge circuit is a common power drive circuit, which is often used in various power drive scenarios, such as audio amplifier drive scenarios, motor drive scenarios, etc. By inputting PWM square waves with different duty cycles into the H-bridge circuit, the switch tube in the H-bridge circuit can be controlled to output different waveforms at different output ends of the H-bridge circuit, ultimately achieving speaker drive or motor drive.

[0003] However, when the PWM signal level jumps, the signal used to control the on-state of the switch tube may jump too fast, causing an overshoot voltage at the output end of the H-bridge circuit, resulting in the risk of the switch tube being broken down by overvoltage. Summary of the invention

[0004] In order to solve the problem that when a PWM signal has a level jump, a switch tube is at risk of being broken down by overvoltage, an embodiment of the present application provides a drive circuit, a multilateral bridge circuit, a chip and an electronic device.

[0005] In a first aspect, an embodiment of the present application provides a driving circuit, the driving circuit comprising a signal generating module and at least one switch module; wherein the switch module comprises a first switch module, the first switch module comprises a first high-voltage switch tube and a first low-voltage switch tube, and the first high-voltage switch tube and the first low-voltage switch tube have a common source; the signal generating module is respectively connected to the gate of the first high-voltage switch tube and the gate of the first low-voltage switch tube, the signal generating module is used to obtain a modulation signal and generate a first signal and a second signal based on the modulation signal, the signal generating module outputs a first signal to the first high-voltage switch tube and outputs a second signal to the first low-voltage switch tube; according to the first signal and the second signal, in each conduction cycle of the first switch module, the turn-on time of the first high-voltage switch tube is earlier than the turn-on time of the first low-voltage switch tube, and the turn-off time of the first high-voltage switch tube is later than the turn-off time of the first low-voltage switch tube.

[0006] It can be understood that the impedance per unit area (RSP) of the low-voltage switch tube is smaller than the RSP of the high-voltage switch tube. In the embodiment of the present application, some high-voltage switch tubes are replaced with low-voltage switch tubes to obtain a structure of a combination of high-voltage switch tubes and low-voltage switch tubes. The low-voltage switch tube shares part of the load of the high-voltage switch tube, thereby reducing the size of the high-voltage switch tube, the occupied area of ​​the first switch module, and the on-resistance, which not only reduces the cost, but also can further improve the working efficiency of the drive circuit.

[0007] In the embodiment of the present application, in each conduction cycle of the first switch module, the first high-voltage switch tube is turned on first, and then the first low-voltage switch tube is turned on. The first high-voltage switch tube can withstand the overshoot voltage when the first switch module is turned on, thereby preventing the first low-voltage switch tube from being broken down by overvoltage. Similarly, the first low-voltage switch tube is turned off before the first high-voltage switch tube is turned off. The first high-voltage switch tube can withstand the overshoot voltage when the first switch module is turned off, thereby preventing the first low-voltage switch tube from being broken down by overvoltage.

[0008] In a possible implementation, at least one switch module further includes a second switch module, and the first switch module and the second switch module can be alternately turned on and off, so that the drive circuit can alternately output the first voltage and the second voltage.

[0009] In one possible implementation, the second switch module includes a second high-voltage switch tube and a second low-voltage switch tube for controlling its on and off states, and the second high-voltage switch tube and the second low-voltage switch tube have a common source and a common drain; the signal generation module is respectively connected to the gate of the second high-voltage switch tube and the gate of the second low-voltage switch tube, and the signal generation module is also used to output a third signal to the second high-voltage switch tube and output a fourth signal to the second low-voltage switch tube; wherein the third signal and the fourth signal ensure that, in each conduction cycle of the second switch module, the turn-on time of the second high-voltage switch tube is earlier than the turn-on time of the second low-voltage switch tube, and the turn-off time of the second high-voltage switch tube is later than the turn-off time of the second low-voltage switch tube.

[0010] In a possible implementation, the signal generating module is used to obtain a modulated signal, and determine the first signal, the second signal, the third signal, and the fourth signal based on the modulated signal.

[0011] In one possible implementation, the signal generating module determines the rising edge of the first signal and the rising edge of the second signal based on the rising edge of the modulation signal, and determines the falling edge of the first signal and the falling edge of the second signal based on the falling edge of the modulation signal; wherein the rising edge of the first signal is later than the rising edge of the modulation signal, the rising edge of the second signal is later than the rising edge of the first signal, the falling edge of the second signal is synchronized with the falling edge of the modulation signal, and the falling edge of the first signal is later than the falling edge of the modulation signal.

[0012] In one possible implementation, the signal generating module determines the rising edge of the third signal and the rising edge of the fourth signal based on the rising edge of the reverse signal of the modulated signal, and determines the falling edge of the third signal and the falling edge of the fourth signal based on the falling edge of the reverse signal of the modulated signal; wherein, the rising edge of the third signal is later than the rising edge of the reverse signal of the modulated signal, the rising edge of the fourth signal is later than the rising edge of the reverse signal of the modulated signal, the falling edge of the third signal is later than the falling edge of the reverse signal of the modulated signal, and the falling edge of the fourth signal is synchronized with the falling edge of the reverse signal of the modulated signal.

[0013] In a possible implementation, the sources of the first high-voltage switch tube and the first low-voltage switch tube are connected to the load of the driving circuit, and the drains of the second high-voltage switch tube and the second low-voltage switch tube are connected to the load of the driving circuit.

[0014] In a possible implementation, the high-voltage switch tube and the low-voltage switch tube in at least one switch module include any one of an N-type tube, a P-type tube, and a BJT tube.

[0015] In a second aspect, an embodiment of the present application provides a multilateral bridge circuit, comprising a first bridge circuit and a second bridge circuit, wherein the first bridge circuit and the second bridge circuit respectively comprise any one of the driving circuits provided by the first aspect and various possible implementations of the first aspect, wherein the first bridge circuit is connected to the second bridge circuit, and the connection method between the first bridge circuit and the second bridge circuit comprises any one of a series connection, a parallel connection, and a cascade connection.

[0016] In a third aspect, an embodiment of the present application provides a chip, in which is formed any one of the driving circuits provided by the first aspect and its various possible implementations, or any one of the multilateral bridge circuits provided by the second aspect and its various possible implementations.

[0017] In a fourth aspect, an embodiment of the present application provides an electronic device, and the electronic device includes any chip provided by the third aspect and various possible implementations of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A structural schematic diagram of an H-bridge circuit is shown;

[0019] Figure 2 According to an embodiment of the present application, a schematic diagram of the structure of a driving circuit is shown;

[0020] Figure 3 According to an embodiment of the present application, a structural schematic diagram of a switch module is shown;

[0021] Figure 4 According to an embodiment of the present application, a schematic diagram of the structure of a driving circuit is shown;

[0022] Figure 5 According to an embodiment of the present application, a structural schematic diagram of another driving circuit is shown;

[0023] Figure 6a According to an embodiment of the present application, a schematic diagram showing that the input signals of the first high-voltage switch tube M1_VH and the first low-voltage switch tube M1_VL change with the PWM1 signal is shown;

[0024] Figure 6bAccording to an embodiment of the present application, a schematic diagram showing that the input signals of the second high-voltage switch tube M2_VH and the second low-voltage switch tube M2_VL change with the PWM1 signal is shown;

[0025] Figure 7a According to an embodiment of the present application, a schematic diagram showing that an OUTN signal output by a driving circuit changes with a PWM1 signal is shown;

[0026] Figure 7b According to an embodiment of the present application, a schematic diagram showing that an OUTN signal output by another driving circuit changes with a PWM1 signal is shown;

[0027] Figure 8 According to an embodiment of the present application, a structural schematic diagram of an H-bridge circuit is shown;

[0028] Figure 9a According to an embodiment of the present application, a circuit structure schematic diagram of an H-bridge circuit is shown;

[0029] Figure 9b According to an embodiment of the present application, a circuit structure schematic diagram of another H-bridge circuit is shown;

[0030] Fig.9c According to an embodiment of the present application, a circuit structure schematic diagram of another H-bridge circuit is shown;

[0031] Fig.10 According to an embodiment of the present application, a structural schematic diagram of an electronic device 1300 is shown. DETAILED DESCRIPTION

[0032] Figure 1 An exemplary configuration of an H-bridge circuit is shown. Figure 1 The H-bridge circuit can generally be composed of four switch modules and two signal generation modules for controlling the conduction state of the switch modules, wherein the switch module includes a switch tube, and the signal generation module includes a driver. The following takes the first bridge circuit composed of the switch tube M1, the switch tube M2 and the driver 1 as an example to introduce the working principle of the H-bridge circuit.

[0033] During the operation of the H-bridge circuit, the driver 1 can obtain the PWM1 signal and generate the PWM_HN signal for controlling the conduction state of the switch tube M1 and the PWM_LN signal for controlling the conduction state of the switch tube M2 based on the PWM1 signal. However, when the PWM1 signal level jumps, the jump speed of the PWM_HN signal or the PWM_LN signal may be too fast, resulting in an overshoot voltage at the output end of the first bridge circuit, resulting in the risk of the switch tube being broken down by overvoltage.

[0034] For example, when the PWM1 signal changes from a low level to a high level, the PWM_LN signal changes from a high level to a low level, and the switch tube M2 is turned off. After the PWM1 signal remains at a high level for DT time, the PWM_HN signal changes from a low level to a high level, and the switch tube M1 is turned on, and the first bridge circuit outputs a high-level OUTN signal. The DT time is also called the dead time, which is a time interval set to prevent the two switches on the same bridge arm from being turned on at the same time. During the DT time, the two switches on the same side are turned off.

[0035] However, if the PWM_LN signal changes from high level to low level too quickly, the OUTN signal will change from low level to high level too quickly within the DT time. The OUTN signal output by the first bridge circuit within the DT time will have a large upward overshoot voltage, causing the switch tube to be at risk of overvoltage breakdown.

[0036] When the PWM1 signal changes from high level to low level, the PWM_HN signal also changes from high level to low level, and the control switch tube M1 is turned off. At this time, the OUTN signal changes from high level to low level. After the PWM1 signal remains at a low level for DT time, the PWM_LN signal changes from low level to high level, and the control switch tube M2 is turned on, and the OUTN signal remains at a low level.

[0037] However, if the PWM_HN signal changes from high level to low level too quickly, the OUTN signal will change from high level to low level too quickly within the DT time. The OUTN signal output by the first bridge circuit within the DT time will have a large downward overshoot voltage, causing the switch tube to be at risk of overvoltage breakdown.

[0038] Similarly, for the second bridge circuit composed of switch tubes M3, M4 and driver 2, when the PWM_HP signal or the level jump speed of the PWM_HP signal is too fast, a large overshoot voltage will be generated at the output end of the second bridge circuit, causing the switch tube to have the risk of overvoltage breakdown.

[0039] In some embodiments, in order to prevent the switch tube from being broken down by overvoltage, the edge speed of the control signal can be reduced, for example, the edge speed of the PWM_HN signal and the edge speed of the PWM_LN signal can be reduced. However, reducing the edge speed of the control signal will increase the loss of the switch tube and reduce the efficiency of the switch tube.

[0040] In other embodiments, in order to prevent the switch tube from being broken down by overvoltage, a high-voltage resistant switch tube can be selected. For example, the switch tubes in the first bridge circuit and the second bridge circuit are both set to be high-voltage resistant switch tubes. However, the on-resistance of the high-voltage resistant switch tube is large, which increases the area and reduces the working efficiency of the H-bridge circuit.

[0041] In order to prevent the switch tube from being broken down by overvoltage, the embodiment of the present application provides a driving circuit, such as Figure 2 As shown, the driving circuit includes a signal generating module 101 and at least one switch module; wherein the switch module includes a first switch module 1021, and the first switch module 1021 includes a first high-voltage switch tube M1_VH and a first low-voltage switch tube M1_VL. The output end of the signal generating module 101 is connected to the input end of the first switch module 1021, and the signal generating module 101 is used to obtain the modulation signal PWM1, generate the first signal PWM1_HN and the second signal PWM2_HN based on the modulation signal, and output the first signal PWM1_HN and the second signal PWM2_HN used to control the conduction state of the first switch module 1021 to the first switch module 1021. The first signal PWM1_HN and the second signal PWM2_HN make the conduction time of the first high-voltage switch tube M1_VH earlier than the conduction time of the first low-voltage switch tube M1_VL, and the turn-off time of the first high-voltage switch tube M1_VH later than the turn-off time of the first low-voltage switch tube M1_VL in each conduction cycle of the first switch module 1021.

[0042] It can be understood that the impedance per unit area (RSP) of the low-voltage switch tube is smaller than the RSP of the high-voltage switch tube. Figure 3 Part of the high-voltage switch tube HV1 shown in the switch module (a) is replaced with a low-voltage switch tube LV1, and the following is obtained: Figure 3 The structure of the combination of the high-voltage switch tube HV2 and the low-voltage switch tube LV1 shown in the middle switch module (b) is to share part of the load of the high-voltage switch tube HV2 through the low-voltage switch tube LV1, thereby reducing the size of the high-voltage switch tube HV2, the occupied area and the on-resistance of the switch module (b), thereby not only reducing the cost, but also further improving the working efficiency of the drive circuit.

[0043] In the embodiment of the present application, in each conduction cycle of the first switch module 1021, the first high-voltage switch tube M1_VH is turned on first, and then the first low-voltage switch tube M1_VL is turned on. The first high-voltage switch tube M1_VH can withstand the overshoot voltage when the first switch module 1021 is turned on, thereby preventing the first low-voltage switch tube M1_VL from being broken down by overvoltage. Similarly, the first low-voltage switch tube M1_VL is turned off before the first high-voltage switch tube M1_VH is turned off. The first high-voltage switch tube M1_VH can withstand the overshoot voltage when the first switch module 1021 is turned off, thereby preventing the first low-voltage switch tube M1_VL from being broken down by overvoltage.

[0044] The following describes the exemplary structure of each module in the driving circuit.

[0045] like Figure 4As shown, the signal generating module 101 includes a driver 1, and the first switch module 1021 includes a first high-voltage switch tube M1_VH and a first low-voltage switch tube M1_VL, and the first high-voltage switch tube M1_VH and the first low-voltage switch tube M1_VL have a common source; the driver 1 is respectively connected to the gate of the first high-voltage switch tube M1_VH and the gate of the first low-voltage switch tube M1_VL, and the driver 1 is used to output a first signal PWM1_HN to the first high-voltage switch tube M1_VH, and output a second signal PWM2_HN to the first low-voltage switch tube M1_VL.

[0046] In an embodiment of the present application, the signal generation module 101 can also be used to control the turn-on speed and turn-off speed (or edge speed) of the high-voltage switch tube in at least one switch module, thereby reducing the overshoot voltage generated during the turn-on or turn-off process of the high-voltage switch tube, and further reducing the risk of the switch tube being broken down by overvoltage.

[0047] In the embodiment of the present application, the drain of the first high-voltage switch tube M1_VH and the drain of the first low-voltage switch tube M1_VL of the first switch module 1021 can be connected to the same power source or to different power sources. Figure 4 As shown, the drain of the first high voltage switch tube M1_VH and the drain of the first low voltage switch tube M1_VL are connected to the same power supply PVDD. In other embodiments, Figure 5 As shown, the drain of the first high-voltage switch tube M1_VH is connected to the power supply PVDD1, and the drain of the first low-voltage switch tube M1_VL is connected to the power supply PVDD2.

[0048] In an embodiment of the present application, the withstand voltage range of the high-voltage switch tube is 12V to 36V, and the withstand voltage range of the low-voltage switch tube is 10V to 24V. The drain of the high-voltage switch tube and the drain of the low-voltage switch tube can withstand different voltages. The drain of the high-voltage switch tube and the drain of the low-voltage switch tube are connected to different power supplies, which can ensure better operation of the drain of the high-voltage switch tube and the low-voltage switch tube.

[0049] like Figure 4 As shown, the source of the first high-voltage switch tube M1_VH and the source of the first low-voltage switch tube M1_VL are connected to the output end of the drive circuit, and the output end of the drive circuit can be connected to the load of the drive circuit (not shown in the figure). The load of the drive circuit may include at least one of a motor, a power amplifier, and a motor.

[0050] The generation method of the first signal PWM1_HN and the second signal PWM2_HN is introduced below.

[0051] In the embodiment of the present application, the signal generating module 101 may obtain the modulation signal PWM1 , and determine the first signal PWM1_HN and the second signal PWM2_HN based on the modulation signal PWM1 .

[0052] For example, the signal generating module 101 may determine the rising edge of the first signal PWM1_HN and the rising edge of the second signal PWM2_HN based on the rising edge of the modulation signal PWM1, and determine the falling edge of the first signal PWM1_HN and the falling edge of the second signal PWM2_HN based on the falling edge of the modulation signal PWM1; Figure 6a As shown, the rising edge of the first signal PWM1_HN is later than the rising edge of the modulation signal PWM1 by time T1, the rising edge of the second signal PWM2_HN is later than the rising edge of the first signal PWM1_HN by time T2, the falling edge of the second signal PWM2_HN is synchronized with the falling edge of the modulation signal PWM1, and the falling edge of the first signal PWM1_HN is later than the falling edge of the modulation signal PWM1 by time T3.

[0053] In the embodiment of the present application, at least one switch module further includes a second switch module 1022 , and the first switch module 1021 and the second switch module 1022 can be alternately turned on and off, so that the drive circuit can alternately output the first voltage and the second voltage.

[0054] like Figure 4 As shown, the second switch module 1022 includes a second high-voltage switch tube M2_VH and a second low-voltage switch tube M2_VL for controlling its on and off states; the signal generation module 101 is respectively connected to the gate of the second high-voltage switch tube M2_VH and the gate of the second low-voltage switch tube M2_VL, and the signal generation module 101 is also used to output a third signal PWM1_LN to the second high-voltage switch tube M2_VH, and output a fourth signal PWM2_LN to the second low-voltage switch tube M2_VL; wherein the third signal PWM1_LN and the fourth signal PWM2_LN make, in each conduction cycle of the second switch module 1022, the turn-on time of the second high-voltage switch tube M2_VH is earlier than the turn-on time of the second low-voltage switch tube M2_VL, and the turn-off time of the second high-voltage switch tube M2_VH is later than the turn-off time of the second low-voltage switch tube M2_VL.

[0055] In the embodiment of the present application, the sources of the second high-voltage switch tube SW2_VN and the second low-voltage switch tube M2_VL are grounded, the drains of the second high-voltage switch tube SW2_VN and the second low-voltage switch tube M2_VL are connected to the output end of the drive circuit, and the output end of the drive circuit is connected to the load of the drive circuit (not shown in the figure).

[0056] In the embodiment of the present application, in each conduction cycle of the second switch module 1022, the second high-voltage switch tube M2_VH is turned on first, and then the second low-voltage switch tube M2_VL is turned on, so that the second high-voltage switch tube M2_VH bears the overshoot voltage when the second switch module 1022 is turned on, and the second low-voltage switch tube M2_VL is prevented from being broken down by overvoltage. Moreover, since the second high-voltage switch tube M2_VH and the second low-voltage switch tube M2_VL share a common source and a common drain, turning on the second low-voltage switch tube M2_VL can also reduce the conduction impedance of the second switch module 1022 during the conduction process, thereby improving the working efficiency of the driving circuit. The second low-voltage switch tube M2_VL is turned off before the first high-voltage switch tube M2_VH is turned off, and the second high-voltage switch tube M2_VH can bear the overshoot voltage when the second switch module 1022 is turned off, thereby preventing the second low-voltage switch tube M2_VL from being broken down by overvoltage.

[0057] In the embodiment of the present application, the signal generating module 101 may obtain the modulation signal PWM1 , and determine the third signal PWM1_LN and the fourth signal PWM2_LN based on the modulation signal PWM1 .

[0058] For example, Figure 6b As shown, the signal generating module 101 can determine the rising edge of the third signal PWM1_LN and the rising edge of the fourth signal PWM2_LN based on the rising edge of the reverse signal PWN1 of the modulation signal PWM1, and determine the falling edge of the third signal PWM1_LN and the falling edge of the fourth signal PWM2_LN based on the falling edge of the reverse signal PWN1 of the modulation signal PWM1; wherein, the rising edge of the third signal PWM1_LN is later than the rising edge of the reverse signal PWN1 of the modulation signal PWM1 by time T4, the rising edge of the fourth signal PWM2_LN is later than the rising edge of the reverse signal PWN1 of the modulation signal PWM1 by time T5, the falling edge of the third signal PWM1_LN is later than the falling edge of the reverse signal PWN1 of the modulation signal PWM1 by time T6, and the falling edge of the fourth signal PWM2_LN is synchronized with the falling edge of the reverse signal of the modulation signal PWM1.

[0059] The following is based on Figure 7a and Figure 7b , the change process of the OUTN signal output by the driving circuit along with the PWM1 signal is introduced.

[0060] like Figure 7aAs shown, when the modulation signal PWM1 jumps from a low level to a high level, the reverse signal PWN1 of the modulation signal PWM1 jumps from a high level to a low level, and the signal generation module 101 can determine the falling edge of the fourth signal PWM2_LN based on the falling edge of the reverse signal PWN1 of the modulation signal PWM1, and control the second low-voltage switch tube M2_VL to turn off. After the reverse signal PWN1 of the modulation signal PWM1 maintains a low level for a time period of T6 (or after the modulation signal PWM1 maintains a high level for a time period of T6), the third signal PWM1_LN jumps from a high level to a low level, and controls the second high-voltage switch tube M2_VH to turn off. After the modulation signal PWM1 continues to maintain a high level for a time period of DT, the first signal PWM1_HN jumps from a low level to a high level, controls the first high-voltage switch tube M1_VH to turn on, and the OUTN signal output by the driving circuit jumps from a low level to a high level; after the modulation signal PWM1 continues to maintain a high level for a time period of T2, the second signal PWM2_HN jumps from a low level to a high level, and controls the first low-voltage switch tube M1_VL to turn on. Among them, time T6+time DT=time T1.

[0061] It can be understood that within the time DT after the second high-voltage switch tube M2_VH is turned off, Figure 7a As shown, the OUTN signal output by the driving circuit may overshoot upward, but because the second high-voltage switch tube M2_VH is turned off last in the second switch module 1022 and the first high-voltage switch tube M1_VH is turned on first in the first switch module 1021, the second high-voltage switch tube M2_VH and the first high-voltage switch tube M1_VH can withstand the overshoot voltage, thereby preventing the switch tubes in the driving circuit from being broken down. The first low-voltage switch tube M1_VL is turned on after the first high-voltage switch tube M1_VH is turned on, which can reduce the on-resistance of the first switch module 1021 during the conduction process and improve the working efficiency of the driving circuit.

[0062] In the embodiment of the present application, the signal generation module 101 can be used to control the turn-on speed of the first high-voltage switch tube M1_VH and the turn-off speed of the second high-voltage switch tube M2_VH, thereby reducing the overshoot voltage generated during the turn-on process of the first high-voltage switch tube M1_VH and the turn-off process of the second high-voltage switch tube M2_VH.

[0063] When the modulation signal PWM1 changes from a high level to a low level, the reverse signal PWN1 of the modulation signal PWM1 changes from a low level to a high level, and the signal generation module 101 can determine the falling edge of the second signal PWM2_HN based on the modulation signal PWM1, and control the first low-voltage switch tube M1_VL to turn off. After the modulation signal PWM1 maintains a low level for a time period of T3, the first signal PWM1_HN changes from a high level to a low level, controls the first high-voltage switch tube M1_VH to turn off, and the OUTN signal output by the drive circuit changes from a high level to a low level. After the modulation signal PWM1 maintains a low level for a time period of DT (or after the reverse signal PWN1 of the modulation signal PWM1 maintains a low level for a time period of DT), the third signal PWM1_LN changes from a low level to a high level, and controls the second high-voltage switch tube M2_VH to turn on. After the modulation signal PWM1 keeps the low level time T5 (or after the inverse signal PWN1 of the modulation signal PWM1 keeps the low level time T5), the fourth signal PWM2_LN changes from low level to high level to control the second voltage switch tube M2_VL to be turned on.

[0064] It can be understood that within the time DT after the first high-voltage switch tube M1_VH is turned off, Figure 7b As shown, the OUTN signal output by the driving circuit will overshoot, but because the first high-voltage switch tube M1_VH is turned off last in the first switch module 1021 and the second high-voltage switch tube M2_VH is turned on first in the second switch module 1022, the first high-voltage switch tube M1_VH and the second high-voltage switch tube M2_VH can withstand the overshoot voltage, thereby preventing the switch tubes in the driving circuit from being broken down. The second low-voltage switch tube M2_VL is turned on after the second high-voltage switch tube M2_VH is turned on, which can reduce the on-resistance of the second switch module 1022 during the conduction process and improve the working efficiency of the driving circuit.

[0065] In the embodiment of the present application, the signal generation module 101 can be used to control the turn-off speed of the first high-voltage switch tube M1_VH and the turn-on speed of the second high-voltage switch tube M2_VH, thereby reducing the overshoot voltage generated during the turn-off process of the first high-voltage switch tube M1_VH and the turn-on process of the second high-voltage switch tube M2_VH.

[0066] The embodiment of the present application also provides a multilateral bridge circuit, including a first bridge circuit 801 and a second bridge circuit 802, wherein the first bridge circuit 801 and the second bridge circuit 802 respectively include: Figure 4 The driving circuit shown in FIG. 8 is a circuit diagram of a first bridge circuit 801 connected to a second bridge circuit 802. The connection method between the first bridge circuit 801 and the second bridge circuit 802 includes the following steps: Figure 8 Any of the series connection, parallel connection, and cascade connection shown.

[0067] Figure 9aFIG. 8 is a schematic diagram showing a circuit structure in which a first bridge circuit 801 and a second bridge circuit 802 are connected in series, wherein the switch tubes in the first bridge circuit 801 and the second bridge circuit 802 are both N-type tubes. Figure 9a As shown, the output end of the first bridge circuit 801 is connected in series with the output end of the second bridge circuit 802. The circuit structure of the first bridge circuit 801 and the circuit structure of the second bridge circuit 802 are similar to Figure 4 The structures of the driving circuits shown are the same, and the drain of the first high voltage switch tube M1_VH, the drain of the third high voltage switch tube M3_VH, the drain of the first low voltage switch tube M1_VL, and the drain of the third low voltage switch tube M3_VL are all connected to the power supply PVDD.

[0068] Figure 9b FIG. 8 is a schematic diagram showing a circuit structure in which a first bridge circuit 801 and a second bridge circuit 802 are connected in series, wherein the switch tubes in the first bridge circuit 801 and the second bridge circuit 802 are both P-type tubes. Figure 9b As shown, the output end of the first bridge circuit 801 is connected in series with the output end of the second bridge circuit 802. The circuit structure of the first bridge circuit 801 and the circuit structure of the second bridge circuit 802 are similar to Figure 4 The structures of the driving circuits shown are the same, and the drain of the first high voltage switch tube M1_VH, the drain of the third high voltage switch tube M3_VH, the drain of the first low voltage switch tube M1_VL, and the drain of the third low voltage switch tube M3_VL are all connected to the power supply PVDD.

[0069] It can be understood that, corresponding to the switch module 8011 in the first bridge 801 and the switch module 8022 in the second bridge 802 being turned on, the current flows through the switch module 8011, the load of the multilateral bridge circuit and the switch module 8022; corresponding to the switch module 8012 in the first bridge 801 and the switch module 8021 in the second bridge 802 being turned on, the current flows through the switch module 8021, the load of the multilateral bridge circuit and the switch module 8012.

[0070] Fig.9c FIG. 8 shows another schematic diagram of a structure in which a first bridge circuit 801 and a second bridge circuit 802 are connected in series. Fig.9c As shown, the output end of the first bridge circuit 801 is connected in series with the output end of the second bridge circuit 802. The circuit structure of the first bridge circuit 801 and the circuit structure of the second bridge circuit 802 are similar to Figure 5 The structure of the driving circuit shown is the same, the drain of the first high voltage switch tube M1_VH and the drain of the third high voltage switch tube M3_VH are connected to the power supply PVDD1, the drain of the first low voltage switch tube M1_VL and the drain of the third low voltage switch tube M3_VL are connected to the power supply PVDD2.

[0071] In an embodiment of the present application, the high-voltage switch tube and the low-voltage switch tube in at least one switch module of the drive circuit include any one of an N-type tube, a P-type tube, and a BJT tube.

[0072] The present application also provides a chip, wherein the chip is formed as follows Figure 4 or Figure 5 The drive circuit shown or Figure 8 or Figures 9a to 9c The multilateral bridge circuit shown.

[0073] An embodiment of the present application also provides an electronic device, which includes the above chip.

[0074] According to an embodiment of the present application, Fig.10 FIG. 1 is a block diagram of an electronic device 1300 based on a system on chip (SOC). Fig.10 In the FIG, similar components have the same reference numerals. In addition, the dashed boxes are optional features of more advanced SOCs. Fig.10 In the embodiment, the electronic device 1300 includes: an interconnect unit 1350, which is coupled to the processor 1315; a system agent unit 1370; a bus controller unit 1380; an integrated memory controller unit 1340; a group or one or more coprocessors 1320, which may include integrated graphics logic, image processors, audio processors, and video processors; a static random-access memory (SRAM) unit 1330; and a direct memory access (DMA) unit 1360. In one embodiment, the coprocessor 1320 includes a special-purpose processor, such as, for example, a network or communication processor, a compression engine, or an embedded processor.

[0075] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, instructions may be distributed over a network or through other computer-readable media. Therefore, machine-readable media may include any mechanism for storing or transmitting information in a machine (e.g., computer) readable form, including but not limited to floppy disks, optical disks, optical disks, read-only memories (compact disc-read only memories, CD-ROMs), magneto-optical disks, read-only memories (read only memory, ROM), random access memories (random access memory, RAM), erasable programmable read-only memories (erasable programmable read-only memories, EPROM), electrically erasable programmable read-only memories (electrically erasable programmable read-only memories, EEPROM), magnetic or optical cards, flash memory, or a tangible machine-readable memory for transmitting information (e.g., carrier waves, infrared signals, digital signals, etc.) using the Internet in electrical, optical, acoustic, or other forms of propagation signals. Accordingly, machine-readable media include any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a form readable by a machine (eg, a computer).

[0076] In the accompanying drawings, some structural or method features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be required. Instead, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. In addition, the inclusion of structural or method features in a particular figure does not mean that such features are required in all embodiments, and in some embodiments, these features may not be included or may be combined with other features.

[0077] It should be noted that the units / modules mentioned in the various device embodiments of the present application are all logical units / modules. Physically, a logical unit / module can be a physical unit / module, or a part of a physical unit / module, or can be implemented as a combination of multiple physical units / modules. The physical implementation method of these logical units / modules themselves is not the most important. The combination of functions implemented by these logical units / modules is the key to solving the technical problems proposed by the present application. In addition, in order to highlight the innovative part of the present application, the above-mentioned device embodiments of the present application do not introduce units / modules that are not closely related to solving the technical problems proposed by the present application, which does not mean that there are no other units / modules in the above-mentioned device embodiments.

[0078] It should be noted that in the examples and description of this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises one" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0079] Although the present application has been illustrated and described with reference to certain preferred embodiments thereof, it will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present application.

Claims

1. A driving circuit, characterized in that: The driving circuit includes a signal generating module and at least one switch module; wherein the switch module includes a first switch module, the first switch module includes a first high-voltage switch tube and a first low-voltage switch tube, and the first high-voltage switch tube and the first low-voltage switch tube share a common source; The signal generating module is connected to the gate of the first high-voltage switch tube and the gate of the first low-voltage switch tube respectively, and is used to obtain a modulation signal and generate a first signal and a second signal based on the modulation signal, and the signal generating module outputs the first signal to the first high-voltage switch tube, and outputs the second signal to the first low-voltage switch tube; According to the first signal and the second signal, in each conduction cycle of the first switch module, the turn-on time of the first high-voltage switch tube is earlier than the turn-on time of the first low-voltage switch tube, and the turn-off time of the first high-voltage switch tube is later than the turn-off time of the first low-voltage switch tube.

2. The driving circuit according to claim 1, characterized in that: The at least one switch module further includes a second switch module, and the first switch module and the second switch module can be alternately turned on and off, so that the drive circuit can alternately output a first voltage and a second voltage.

3. The driving circuit according to claim 2, characterized in that: The second switch module comprises a second high-voltage switch tube and a second low-voltage switch tube for controlling the on and off states thereof, and the second high-voltage switch tube and the second low-voltage switch tube share a common source and a common drain; The signal generating module is connected to the gate of the second high-voltage switch tube and the gate of the second low-voltage switch tube respectively, and the signal generating module is also used to output a third signal to the second high-voltage switch tube and output a fourth signal to the second low-voltage switch tube; wherein the third signal and the fourth signal make, in each conduction cycle of the second switch module, the conduction time of the second high-voltage switch tube is earlier than the conduction time of the second low-voltage switch tube, and the turn-off time of the second high-voltage switch tube is later than the turn-off time of the second low-voltage switch tube.

4. The driving circuit according to claim 3, characterized in that: include: The signal generating module is used to obtain a modulated signal, and determine the first signal, the second signal, the third signal and the fourth signal based on the modulated signal.

5. The driving circuit according to claim 4, characterized in that: The signal generating module determines a rising edge of the first signal and a rising edge of the second signal based on a rising edge of the modulated signal, and determines a falling edge of the first signal and a falling edge of the second signal based on a falling edge of the modulated signal; Among them, the rising edge of the first signal is later than the rising edge of the modulation signal, the rising edge of the second signal is later than the rising edge of the first signal, the falling edge of the second signal is synchronized with the falling edge of the modulation signal, and the falling edge of the first signal is later than the falling edge of the modulation signal.

6. The driving circuit according to claim 4, characterized in that: The signal generating module determines a rising edge of the third signal and a rising edge of the fourth signal based on a rising edge of the reverse signal of the modulating signal, and determines a falling edge of the third signal and a falling edge of the fourth signal based on a falling edge of the reverse signal of the modulating signal; Among them, the rising edge of the third signal is later than the rising edge of the reverse signal of the modulated signal, the rising edge of the fourth signal is later than the rising edge of the reverse signal of the modulated signal, the falling edge of the third signal is later than the falling edge of the reverse signal of the modulated signal, and the falling edge of the fourth signal is synchronized with the falling edge of the reverse signal of the modulated signal.

7. The driving circuit according to claim 3, characterized in that: The sources of the first high-voltage switch tube and the first low-voltage switch tube are connected to the load of the drive circuit, and the drains of the second high-voltage switch tube and the second low-voltage switch tube are connected to the load of the drive circuit.

8. The driving circuit according to claim 3, characterized in that: The high-voltage switch tube and the low-voltage switch tube in the at least one switch module include any one of an N-type tube, a P-type tube, and a BJT tube.

9. A multilateral bridge circuit, comprising a first bridge circuit and a second bridge circuit, wherein the first bridge circuit and the second bridge circuit respectively comprise the driving circuit according to any one of claims 1 to 8, wherein: The first bridge circuit is connected to the second bridge circuit, and the connection mode between the first bridge circuit and the second bridge circuit includes any one of a series connection, a parallel connection, and a cascade connection.

10. A chip, characterized in that: The chip has a driving circuit as described in any one of claims 1 to 8 or a multilateral bridge circuit as described in claim 9 formed therein.

11. An electronic device, characterized in that: The electronic device comprises the chip according to claim 10.

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