A full-bridge driving chip and driving circuit

Abstract

The embodiment of the present application provides a full-bridge driving chip and a driving circuit.The full-bridge driving chip comprises a logic control module (1), a register (2) and a plurality of driving modules (3), the logic control module (1) is connected with the register (2), wherein the driving module (3) comprises a pre-driving current collection pump (31), a high-side switch (32) and a low-side switch (33), the pre-driving current collection pump (31) is connected with the high-side switch (32), the high-side switch (32) is connected with the low-side switch (33), the logic control module (1) is connected with the pre-driving current collection pump (31), the logic control module (1) is connected with the low-side switch (33), the high-side switch (32) is connected with an input power supply Vcc, and the low-side switch (33) is grounded.In the technical scheme provided by the embodiment of the present application, the full-bridge driving chip integrates the functions of a half-bridge driving chip, a high-side switch chip and a low-side switch chip, the circuit complexity is reduced, and the flexibility of circuit application is improved.

Description

[Technical Field]

[0001] This invention relates to the field of circuit technology, and in particular to a full-bridge driver chip and driver circuit. [Background Technology]

[0002] Currently, half-bridge driver chips, high-side switching chips, and low-side switching chips are widely used in various automotive components, and it is not uncommon for all of these chips to be used simultaneously. In such cases, typical circuit designs require the simultaneous use of half-bridge driver chips, high-side switching chips, and low-side switching chips, resulting in high circuit complexity and poor flexibility in circuit application. [Summary of the Invention]

[0003] In view of this, embodiments of the present invention provide a full-bridge driver chip and driver circuit to reduce circuit complexity and improve the flexibility of circuit application.

[0004] On one hand, an embodiment of the present invention provides a full-bridge driver chip, including: a logic control module (1), a register (2), and a plurality of driver modules (3). The logic control module (1) is connected to the register (2). The driver module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31) and the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded.

[0005] Optionally, it also includes an input / output interface (4) connected to the high-side switch (32).

[0006] Optionally, the register (2) is used to configure the number of channels of the half-bridge drive circuit, the high-side switch circuit, the low-side switch circuit and the full-bridge drive circuit, and to set the function of each drive module (3).

[0007] Optionally, when the full-bridge driver chip is configured as a high-side switching circuit, the driver module (3) is configured as a high-side switching circuit through the register (2), the driving signal of the low-side switch (33) is shielded, the input power supply Vcc is directly connected to the high-side switch (32), and the input / output interface (4) is directly connected to the load as an output channel.

[0008] Optionally, when the full-bridge driver chip is configured as a low-side switching circuit, the driver module (3) is configured as a low-side switching circuit through the register (2), the driving signal of the high-side switch (32) is shielded, the input power supply Vcc is directly connected to the load, and the input / output interface (4) is connected to the low-side switch (33) as an input channel.

[0009] Optionally, when the full-bridge driver chip is configured as a half-bridge driver circuit, the driver module (3) is configured as a half-bridge circuit through the register (2). The drive signals of the high-side switch (32) and the low-side switch (33) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32). The input / output interface (4) is used as a push-pull output and input channel to connect to the load.

[0010] Optionally, when the full-bridge driver chip is configured as a full-bridge driver circuit, the two driver modules (3) are configured as a full-bridge circuit through the register (2). The drive signals of the high-side switch (32) and low-side switch (33) of the two driver modules (3) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32) of the two driver modules (3). The input and output interfaces (4) of the two driver units (3) are respectively connected to the two ends of the load.

[0011] Optionally, the high-side switch (32) includes a high-side Nmos.

[0012] Optionally, the low-side switch (32) includes a low-side Nmos.

[0013] On the other hand, embodiments of the present invention provide a driving circuit including the above-described full-bridge driving chip.

[0014] In the technical solution of the full-bridge driver chip provided in this embodiment of the invention, the full-bridge driver chip includes: a logic control module (1), a register (2), and multiple driver modules (3). The logic control module (1) is connected to the register (2). The driver module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31) and the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded. In the technical solution provided in this embodiment of the invention, the full-bridge driver chip integrates the functions of a half-bridge driver chip, a high-side switch chip, and a low-side switch chip, reducing circuit complexity and improving the flexibility of circuit application. [Attached Image Description]

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a driving circuit provided in related technologies;

[0017] Figure 2 This is a schematic diagram of the structure of a full-bridge driver chip according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of a driving circuit provided in an embodiment of the present invention.

Detailed Implementation Methods

[0019] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] It should be understood that the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] A schematic diagram of a driving circuit is provided in the related technology. Figure 1 This is a schematic diagram of a driving circuit provided in related technologies, such as... Figure 1As shown, the drive circuit includes: a power management module 10, a main control chip 11, a half-bridge driver chip 12, a high-side switch chip 13, a low-side switch chip 14, a DC motor 15, and a load 16. The power management module 12 receives a 12V power supply and is electrically connected to the main control chip 11, the half-bridge driver chip 12, the high-side switch chip 13, and the low-side switch chip 14. The main control chip 11 can control the half-bridge driver chip 12, the high-side switch chip 13, and the low-side switch chip 14 respectively via control signals. The input power supply Vcc is electrically connected to the half-bridge driver chip 12 and the high-side switch chip 13. The half-bridge driver chip 12 is electrically connected to the DC motor 15. The high-side switch chip 13 is electrically connected to the load 16, the load 16 is electrically connected to the low-side switch chip 14, and the low-side switch chip 14 is grounded. Figure 1 The drive circuit design is complex, requiring the simultaneous design of application circuits for the half-bridge driver chip 12, high-side switch chip 13, and low-side switch chip 14. It also suffers from poor flexibility, as one circuit can only drive one load. The application circuits using multiple half-bridge driver chips 12, high-side switch chips 13, and low-side switch chips 14 increase the circuit board area, which is detrimental to the design and development of components with strict size requirements. Furthermore, the excessive number of lines increases the system's stray inductance, which to some extent reduces the overall electromagnetic compatibility (EMC) performance of the components.

[0024] To address the technical problems in related technologies, one embodiment of the present invention provides a full-bridge driver chip. By analyzing the internal functional structure of the full-bridge driver chip, each driver module includes high-side switching, low-side switching, and half-bridge driving functions. By changing register settings and adjusting the internal drive signals, along with the external circuit connection method, the half-bridge driving circuit, high-side switching circuit, and low-side switching circuit can be flexibly configured to achieve compatible functions for half-bridge driving, high-side switching, and low-side switching.

[0025] Figure 2 This is a schematic diagram of a full-bridge driver chip according to an embodiment of the present invention, as shown below. Figure 2 As shown, the full-bridge driver chip includes: a logic control module (1), a register (2), and multiple driver modules (3). The logic control module (1) is connected to the register (2). The driver module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31), and the logic control module (1) is connected to the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded.

[0026] The logic control module (1) can be used to send logic control signals. The register (2) can be used to store the corresponding drive information of the pre-drive collector pump (31), the high-side switch (32), and the low-side switch (33). The pre-drive collector pump (31) can be used to ensure that the high-side switch (32) has a sufficient gate turn-on voltage to meet the turn-on conditions. The high-side switch (32) can be used as a circuit power supply side switch to control the circuit on and off. The low-side switch (33) and the high-side switch (32) can be used as grounding switches to control the circuit on and off.

[0027] In one embodiment of the present invention, the full-bridge driver chip further includes an input / output interface (4), wherein the input / output interface (4) is connected to the high-side switch (32). The input / output interface (4) can provide input / output functions for the driver circuit.

[0028] In one embodiment of the present invention, the number of channels of the half-bridge driving circuit, high-side switching circuit, low-side switching circuit and full-bridge driving circuit can be configured in the register (2) of the full-bridge driving chip according to the actual use scenario, and the specific driving module functions can be specified. When the number of driving modules (3) is 4, one driving module (3) can be configured as a high-side switching circuit; one driving module (3) can be configured as a low-side switching circuit; and two driving modules (3) can be configured as a half-bridge driving circuit.

[0029] In one embodiment of the present invention, when the full-bridge driver chip is configured as a high-side switching circuit, the driver module (3) is configured as a high-side switching circuit through the register (2), the drive signal of the low-side switch (33) is shielded, the input power supply Vcc is directly connected to the high-side switch (32), and the input / output interface (4) is directly connected to the load as an output channel. When a loop needs to be opened, the logic control module (1) only sends a drive enable signal to the pre-drive collector pump (31). Under the action of the collector pump, the gate of the high-side switch (32) is opened, so that the entire high-side switching circuit forms a loop. At this time, the high-side switch (32) is only used as a high-side switch.

[0030] In one embodiment of the present invention, when the full-bridge driver chip is configured as a low-side switching circuit, the driver module (3) is configured as a low-side switching circuit through the register (2), the drive signal of the high-side switch (32) is shielded, the input power supply Vcc is directly connected to the load, and the input / output interface (4) is connected to the low-side switch (33) as an input channel. When a loop needs to be opened, the logic control module (1) only sends a drive enable signal to the low-side switch (33) and opens the gate of the low-side switch (33) to form a loop in the entire low-side switching circuit. At this time, the low-side switch (33) is only used as a low-side switch.

[0031] In one embodiment of the present invention, when the full-bridge driver chip is configured as a half-bridge driver circuit, the driver module (3) is configured as a half-bridge circuit through the register (2). The drive signals of the high-side switch (32) and the low-side switch (33) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32). The input / output interface (4) is used as a push-pull output and input channel to connect one end of the load, and the other end of the load is grounded. When the half-bridge driver circuit is working, the logic control module (1) sends the drive signals of the high-side switch (32) and the low-side switch (33) in turn according to the specified timing in the register (2), so that the high-side switch (32) and the low-side switch (33) switch alternately, so that the half-bridge circuit forms a loop. At this time, the high-side switch (32) and the low-side switch (33) are used as push-pull circuit switches.

[0032] In one embodiment of the present invention, when the full-bridge driver chip is configured as a full-bridge driver circuit, the two driver modules (3) are configured as a full-bridge circuit through the register (2). The two driver modules (3) may include a first driver module and a second driver module. The drive signals of the high-side switch (32) and the low-side switch (33) of the two driver modules (3) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32) of the two driver modules (3). The input and output interfaces (4) of the two driver units (3) are respectively connected to the two ends of the load. When the full-bridge circuit is working, the logic control module (1) sends the drive signal of the high-side switch (32) and the drive signal of the low-side switch (33) through the two driver modules (3) in turn according to the specified timing set in the register (2). This causes the high-side switch (32) of the first driver module and the low-side switch (33) of the second driver module to switch simultaneously, and the low-side switch (33) of the first driver module and the high-side switch (32) of the second driver module to switch simultaneously, so that the current in the load changes direction.

[0033] In one embodiment of the present invention, the high-side switch (32) includes a high-side Nmos.

[0034] In one embodiment of the present invention, the low-side switch (33) includes a low-side Nmos.

[0035] In one embodiment of the present invention, each driving module (3) may have the same structure.

[0036] In the technical solution provided by this embodiment of the invention, the full-bridge driver chip includes: a logic control module (1), a register (2), and multiple driver modules (3). The logic control module (1) is connected to the register (2). Each driver module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31) and the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded. In the technical solution provided by this embodiment of the invention, the full-bridge driver chip integrates the functions of a half-bridge driver chip, a high-side switch chip, and a low-side switch chip, reducing circuit complexity and improving the flexibility of circuit applications.

[0037] In the technical solutions provided by the embodiments of the present invention, the full-bridge driver chip typically has multiple outputs and complete internal logic control and drive circuits, which can better combine multiple switching circuits, reduce the number of chips used, simplify the external circuit design of the chip, and reduce design costs.

[0038] In the technical solution provided by the embodiments of the present invention, the output mode can be controlled by the combination of register shielding single transistor on / off and logic control inside the full-bridge driver chip, so as to realize the flexible application of the full-bridge driver chip and meet the different functional requirements of different components in different application scenarios.

[0039] The technical solution provided in this invention effectively reduces the overall circuit length of the full-bridge driver chip, reduces the overall stray inductance and external electromagnetic interference of the system, and improves the EMC performance of the components.

[0040] Based on the aforementioned full-bridge driver chip, one embodiment of the present invention provides a driver circuit that, by adjusting the circuit connection between the load and the correspondingly configured full-bridge chip, enables the high-side switching and low-side switching applications of the full-bridge driver chip. The specific circuit application technology is as follows:

[0041] 1) The high-side switching circuit has an input power supply Vcc connected to the high-side switch (32) and output to one end of the high-side circuit load (18) through the input / output interface (4). The other end of the high-side circuit load (18) is connected to ground through an external wire to realize the high-side switching circuit.

[0042] 2) Low-side switching circuit: The input power supply Vcc is connected to the low-side circuit load (19), input to the low-side switch (33) through the input / output interface (4), and connected to ground through the internal wires of the full-bridge driver chip to realize the low-side switching circuit.

[0043] 3) Half-bridge drive circuit: The input power supply Vcc is connected to the high-side switch (32) of a drive module (3), and output to one end of the half-bridge drive load (17) through the input / output interface (4). The other end of the half-bridge drive load (17) is grounded to realize the half-bridge drive circuit.

[0044] 4) The full-bridge drive circuit can use two drive modules (3). The input power supply Vcc is connected to the high-side switch (32) of the two drive modules (3). The two drive modules (4) are connected to the two ends of the full-bridge drive load (20) through the input and output interface (4) respectively to realize the full-bridge drive circuit.

[0045] After the above circuit is built and integrated, the following can be obtained: Figure 3 The driving circuit shown, Figure 3 This is a schematic diagram of a driving circuit according to an embodiment of the present invention, as shown below. Figure 3 As shown, the driving circuit includes the full-bridge driving chip (100), power management module (10), main control chip (11), half-bridge driving load (17), high-side circuit load (18), low-side circuit load (19) and full-bridge driving load (20).

[0046] The power management module (10) can receive 12V power and is electrically connected to the main control chip (11) and the full-bridge driver chip (100). The main control chip (11) can control the full-bridge driver chip (100) through control signals. The input power supply Vcc is electrically connected to the full-bridge driver chip (100) and the low-side circuit load (19). The full-bridge driver chip (100) is electrically connected to the half-bridge drive load (17), the high-side circuit load (18), the low-side circuit load (19), and the full-bridge drive load (20), respectively. The high-side circuit load 18 is grounded, the full-bridge driver chip 100 is grounded, and the half-bridge drive load (17) is grounded.

[0047] In the technical solution provided by this embodiment of the invention, the full-bridge driver chip includes: a logic control module (1), a register (2), and multiple driver modules (3). The logic control module (1) is connected to the register (2). Each driver module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31) and the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded. In the technical solution provided by this embodiment of the invention, the full-bridge driver chip integrates the functions of a half-bridge driver chip, a high-side switch chip, and a low-side switch chip, reducing circuit complexity and improving the flexibility of circuit applications.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A full-bridge driver chip, characterized in that, include: The system comprises a logic control module (1), a register (2), and multiple drive modules (3). The logic control module (1) is connected to the register (2). The drive module (3) includes a pre-drive collector pump (31), a high-side switch (32), and a low-side switch (33). The pre-drive collector pump (31) is connected to the high-side switch (32), and the high-side switch (32) is connected to the low-side switch (33). The logic control module (1) is connected to the pre-drive collector pump (31), and the logic control module (1) is connected to the low-side switch (33). The high-side switch (32) is connected to the input power supply Vcc, and the low-side switch (33) is grounded. The register (2) is used to configure the number of channels of the half-bridge drive circuit, the high-side switch circuit, the low-side switch circuit and the full-bridge drive circuit, and to set the function of each drive module (3).

2. The full-bridge driver chip according to claim 1, characterized in that, Also includes: Input / output interface (4) is connected to the high-side switch (32).

3. The full-bridge driver chip according to claim 1, characterized in that, When the full-bridge driver chip is configured as a high-side switch circuit, the driver module (3) is configured as a high-side switch circuit through the register (2), the drive signal of the low-side switch (33) is shielded, the input power supply Vcc is directly connected to the high-side switch (32), and the input / output interface (4) is directly connected to the load as an output channel.

4. The full-bridge driver chip according to claim 1, characterized in that, When the full-bridge driver chip is configured as a low-side switching circuit, the driver module (3) is configured as a low-side switching circuit through the register (2), the driving signal of the high-side switch (32) is shielded, the input power supply Vcc is directly connected to the load, and the input / output interface (4) is connected to the low-side switch (33) as an input channel.

5. The full-bridge driver chip according to claim 1, characterized in that, When the full-bridge driver chip is configured as a half-bridge driver circuit, the driver module (3) is configured as a half-bridge circuit through the register (2). The drive signals of the high-side switch (32) and the low-side switch (33) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32). The input / output interface (4) is used as a push-pull output and input channel to connect the load.

6. The full-bridge driver chip according to claim 1, characterized in that, When the full-bridge driver chip is configured as a full-bridge driver circuit, the two driver modules (3) are configured as a full-bridge circuit through the register (2). The drive signals of the high-side switch (32) and low-side switch (33) of the two driver modules (3) are not shielded. The input power supply Vcc is directly connected to the high-side switch (32) of the two driver modules (3). The input and output interfaces (4) of the two driver units (3) are respectively connected to the two ends of the load.

7. The full-bridge driver chip according to claim 1, characterized in that, The high-side switch (32) includes a high-side Nmos.

8. The full-bridge driver chip according to claim 1, characterized in that, The low-side switch (32) includes a low-side Nmos.

9. A driving circuit, characterized in that, Includes the full-bridge driver chip as described in any one of claims 1 to 8.

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