Power conversion device driving module capable of selecting multi-path output

Abstract

The utility model discloses a power conversion device driving module capable of selecting multi-path output, relates to the field of power conversion device driving modules, aims to solve the problem that various driving mode requirements cannot be met in the prior art, and adopts the technical scheme that two groups of input circuits are adopted; one group of input circuit is connected to the phase inverting circuit after passing through the protection circuit to obtain complementary signal input and then enters the gate driving chip to modulate signals, and the other group of input circuit directly enters the gate driving chip to modulate signals after passing through the protection circuit, so that one power device driving module has different PWM waveform processing modes; and the specific function requirement is met, and the purpose of flexible driving is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power conversion device drive modules, in particular to a power conversion device drive module with selectable multi-channel outputs. Background Art

[0002] With the advancement of society and the development of fields such as industrial automation, robotics, and new energy vehicles, these applications require higher precision and flexibility in PWM output waveforms. Research and development of related driver circuits have already been conducted to address these issues, and some driver circuits have been developed. However, due to the inflexible output of these driver circuits, they are usually installed together with the circuits to be driven. In traditional IC chips, the output of PWM waveforms is often limited by the number and efficiency of I / O ports. Outputting a PWM waveform from a single I / O port is not only inefficient but also unable to control the complementary output PWM waveforms, which poses significant challenges for driving some external circuits. In order to adjust its output mode according to different application scenarios and requirements and achieve wider compatibility, a power device driver module with flexible and selectable outputs is needed. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a power conversion device driving module with selectable multi-channel output, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention discloses a power conversion device driving module with selectable multi-channel output. The technical solution adopted is as follows: it includes an A input port and a B input port. After the A input port and the B input port are respectively connected to a first protection circuit and a second protection circuit, the first protection circuit is connected to an inverting circuit, and the inverting circuit is connected to the first drive circuit and then to the A output port. The inverting circuit can flip the waveform to form a complementary waveform, and the A output port is a complementary output port; the front end of the second protection circuit is connected to a resistor R2, and the rear end is connected to the second drive circuit and then to the B output port, and the B output port is a selectable output port; the inverting circuit, the first drive circuit, and the second drive circuit are all connected to an input voltage, and there is a voltage stabilizing chip between the inverting circuit and the input voltage.

[0005] As a preferred technical solution of the present invention, the first drive circuit and the second drive circuit are both connected to a bootstrap circuit, so as to increase the gate drive voltage and ensure its stability; a fast discharge circuit is connected between the drive circuit and the output port, which can help the gate capacitance of MOSFET to discharge quickly, thereby realizing the rapid shutdown of MOSFET, connecting the gate of the power device, and an inductor is connected to the back end of the fast discharge circuit.

[0006] As a preferred technical solution of the present invention, the first drive circuit and the second drive circuit are both gate drive chips, and the A output port and the B output port are both connected to the gate.

[0007] As a preferred technical solution of the present invention, the A input port has three input lines, which are connected to the same first protection circuit. After passing through the first protection circuit, they are still connected to the inverting circuit in three ways, and are divided into six complementary lines through the inverting circuit, which are connected to the gate drive chip of the first drive circuit.

[0008] As a preferred technical solution of the present invention, the B input port has three input lines, which are connected to the same first protection circuit and directly connected to the gate drive chip of the second drive circuit in three ways after the first protection circuit.

[0009] As a preferred technical solution of the present invention, the first protection circuit and the second protection circuit are both optocoupler isolation circuits, which prevent interference caused by direct electrical connection.

[0010] Compared with the prior art, the beneficial effect of the present invention is as follows: by setting an A input port and a B input port, the input circuit of the A input port is connected to the protection circuit and the inverting circuit and then to the drive circuit, while the input circuit of the B input port is connected to the protection circuit and then directly to the drive circuit, thereby obtaining a complementary port of the A output port and a selectable port of the B output port, thereby enabling a power device drive module to have different PWM waveform processing methods, meet specific functional requirements, and achieve the purpose of flexible driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the principle diagram of the utility model;

[0012] Figure 2 This is the principle diagram of the driver module of the A port input circuit of the utility model;

[0013] Figure 3 This is the principle diagram of the driver module of the B port input circuit of the utility model;

[0014] Figure 4 This is the circuit diagram of the utility model when the drive circuit is input alone.

[0015] In the figure: 1. A input port; 2. B input port; 3. First protection circuit; 4. Second protection circuit; 5. Inverting circuit; 6. First drive circuit; 7. Second drive circuit; 8. A output port; 9. B output port; 10. Voltage regulator chip. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0017] like Figures 1 to 4 As shown, the utility model discloses a power conversion device driver module with selectable multiple outputs. The technical solution adopted is to include two groups of input ports, A input port 1 and B input port 2. A input port 1 has three inputs, and B input port 2 has three inputs. The three inputs of A input port 1 are each connected to a first protection circuit 3, namely a first optical coupler isolation circuit, and then connected to the same inverter circuit 5. The first protection circuit 3 is connected to a 3.3V power supply voltage, and the inverter circuit 5 is connected to the input voltage. A voltage regulator chip 10 is located between the input voltage and the inverter circuit 5. The inverter circuit 5 has six outputs, which are complementary to each other. The six inputs are connected to the first driver circuit 6.

[0018] The three inputs of the B input port 2 are each connected to a resistor R2 and then to an independent second protection circuit 4, that is, a second optocoupler isolation circuit, and then directly connected to the same second drive circuit 7. The second protection circuit 4 is also connected to a 3.3V power supply voltage.

[0019] The circuit principles of the first driving circuit 6 and the second driving circuit 7 are the same. Taking one circuit of the first driving circuit 6 as an example, Figure 4As shown in the figure, the driver chip uses the FD6288T gate driver chip with independent high-side and low-side reference output channels. Its floating channel can be used to drive the high-side N-channel power MOSFET. The maximum operating voltage of the floating ground channel can reach 250V. Both the high and low sides of the chip include undervoltage protection functions. The rated power of the chip at a reference temperature of 25°C is 1.25W. The input PWM waveform PWM1 is connected to the HIN1 (1#) port, and the input voltage VCC is connected to the VCC (7#) port. The input voltage is connected in parallel with the grounded capacitor C4, and the COM (8#) port is grounded. Considering that in some configurations, the gate drive voltage may need to be increased to ensure its stability, a bootstrap circuit is connected between the VS1 (18#) port and the VB1 (20#) port. This bootstrap circuit is isolated from the high side and reverse side of the N-channel power MOSFET to avoid direct electrical connection. After connecting the source of the power device and the bootstrap circuit, it is connected to the A output port 8 to obtain three sets of gate complementary output drive signals. That is, the VB1 (20#) port is connected to the bootstrap capacitor C2, and the front end of the bootstrap capacitor C2 is also connected to the branch supply voltage. The branch circuit has a diode D1. The HO1 (19#) port is connected to the fast discharge circuit. That is, the port is connected to the resistor R1, which is connected in parallel with the diode D2, and the back end of the fast discharge circuit is connected to the inductor.

[0020] The rear end of the bootstrap circuit of the second driving circuit 7 is connected to the B output port 9, so that three independently selectable gate driving outputs can be obtained.

[0021] The two gate drive chips used in the two drive circuits of this embodiment operate independently, corresponding to two different input terminals. Without any wiring connection between them, they output complementary gate drive and independent gate drive, respectively. Furthermore, the two chips operate independently, making them easy to inspect and replace in the event of a fault, thus achieving flexibility and selectable drive output.

[0022] The inverter circuit 5 uses a voltage regulator chip 10 that shares the same VCC input with the gate driver chip to provide a driving voltage. VCC needs to be greater than 12V, and the maximum input VCC voltage does not exceed 30V.

[0023] Working principle:

[0024] Use a user-supplied PWM generation circuit and connect it to the input port according to the specific circuit or product requirements. If the user requires complementary output drive signals, the user can connect one to three PWM signals to the three input terminals (1A, 2A, 3A) of the A input port 1, and the corresponding complementary output gate drive signals can be obtained at the A output port 8.

[0025] If the user needs an independent output drive signal, the user can connect one to three PWM signals to the three input terminals (1B, 2B, 3B) of B input port 2, and the corresponding independent output gate drive signal can be obtained at B output port 9.

[0026] The circuit connection involved in the present invention is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, which belongs to common knowledge.

[0027] Components not described in detail herein are prior art.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power conversion device driver module with selectable multiple outputs, characterized in that: The invention comprises an A input port (1) and a B input port (2), wherein the A input port (1) and the B input port (2) are respectively connected to a first protection circuit (3) and a second protection circuit (4), wherein the first protection circuit (3) is connected to an inverting circuit (5), wherein the inverting circuit (5) is connected to a first drive circuit (6) and then to an A output port (8), wherein the A output port (8) is a complementary output port; the front end of the second protection circuit (4) is connected to a resistor R2, and the rear end is connected to a second drive circuit (7) and then to a B output port (9), wherein the B output port (9) is a selectable output port; the inverting circuit (5), the first drive circuit (6), and the second drive circuit (7) are all connected to an input voltage, and a voltage stabilizing chip (10) is provided between the inverting circuit (5) and the input voltage.

2. The power conversion device driver module with selectable multiple outputs according to claim 1, characterized in that: The first drive circuit (6) and the second drive circuit (7) are both connected to the bootstrap circuit and then to the high side of the N-channel power MOSFET, and a fast discharge circuit is connected between the first drive circuit (6), the second drive circuit (7) and their respective output ports, and an inductor is connected to the rear end of the fast discharge circuit.

3. The power conversion device driver module with selectable multiple outputs according to claim 2, characterized in that: The first drive circuit (6) and the second drive circuit (7) are both gate drive chips, and the A output port (8) and the B output port (9) are both connected to the gate.

4. The power conversion device driver module with selectable multiple outputs according to claim 1, characterized in that: The A input port (1) has three input lines connected to the same first protection circuit (3). After passing through the first protection circuit (3), the three lines are still connected to the inverter circuit (5). The six lines are divided into two complementary lines through the inverter circuit (5) and connected to the gate drive chip of the first drive circuit (6).

5. The power conversion device driver module with selectable multiple outputs according to claim 1, characterized in that: The B input port (2) has three input lines connected to the same first protection circuit (3), and directly connected to the gate drive chip of the second drive circuit (7) in three ways after the first protection circuit (3).

6. The power conversion device driver module with selectable multi-output according to claim 1, characterized in that: The first protection circuit (3) and the second protection circuit (4) are both optocoupler isolation circuits.

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