Field effect transistor isolation driving device

Abstract

The utility model discloses a kind of field effect tube isolation driving devices, it is related to power distribution technical field, including: shell, shell is arranged printed board group in, the bottom of shell is arranged base group, a plurality of lead-out rods are arranged on base group, printed board group is fixed on base group and is electrically connected with a plurality of lead-out rods;Digital isolation control circuit, isolation boost circuit and output drive circuit are integrated on printed board group;Digital isolation control circuit is connected with control chip, the data register output end of digital isolation control circuit is connected with output drive circuit, output drive circuit is connected with the control end of target field effect tube, the state output end of target field effect tube is connected with digital isolation control circuit.The utility model alleviates the technical problem that the existing technology has poor environmental adaptability.

Description

Technical Field

[0001] This utility model relates to the field of power distribution technology, specifically to a field-effect transistor isolation drive device. Background Technology

[0002] Driving a high-capacity MOSFET requires providing a short-term, instantaneous large current and maintaining a suitable gate voltage after the channel is turned on. If a regular control chip or microcontroller is used to drive it directly, the output current is insufficient and the output voltage is not high enough, so a driver is needed.

[0003] There are two main types of existing drive methods: isolated drive and non-isolated drive. The difference between isolated and non-isolated drives lies in whether the control circuit and the power circuit share a common ground. Due to the high operating voltage, high drive power, and high switching frequency in the power distribution circuit, in order to reduce the interference of the power conversion circuit to the control circuit (especially the control system based on digital processors such as DSPs), it is necessary to isolate the power circuit and the control circuit in practical applications. Existing isolated drivers lack switching status monitoring functions and have poor environmental adaptability. Utility Model Content

[0004] The purpose of this invention is to provide a field-effect transistor isolation drive device to solve at least one of the above-mentioned technical problems.

[0005] In a first aspect, this utility model provides a field-effect transistor (FET) isolation driving device, comprising: a housing, a printed circuit board (PCB) assembly disposed within the housing, a base assembly disposed at the bottom of the housing, a plurality of lead-out rods disposed on the base assembly, and the PCB assembly fixed to the base assembly and electrically connected to the plurality of lead-out rods; the PCB assembly integrates a digital isolation control circuit, an isolation boost circuit, and an output driving circuit; wherein, the input terminal of the isolation boost circuit is connected to an external power supply and a ground terminal, and the output isolation voltage terminal of the isolation boost circuit is respectively connected to the power supply terminal of the digital isolation control circuit and the power supply terminal of the output driving circuit, and the isolation... The output isolation ground terminal of the boost circuit is connected to the ground terminal of the target field-effect transistor; the digital isolation control circuit is connected to the control chip, the data register output terminal of the digital isolation control circuit is connected to the output drive circuit, the output drive circuit is connected to the control terminal of the target field-effect transistor, and the status output terminal of the target field-effect transistor is connected to the digital isolation control circuit; the digital isolation control circuit is used to output a corresponding isolation data register signal to the output drive circuit based on the control signal of the control chip, and to output a corresponding isolation feedback signal to the control chip based on the logic level signal of the target field-effect transistor.

[0006] Optionally, the power supply terminal of the digital isolation control circuit is also connected to an external power source.

[0007] Optionally, the input terminal of the digital isolation control circuit is connected to the output terminal of the control chip, the feedback input terminal of the digital isolation control circuit is connected to the state output terminal of the target field-effect transistor, and the feedback output terminal of the digital isolation control circuit is connected to the input terminal of the control chip.

[0008] Optionally, the control chip includes a digital signal processor and a microcontroller.

[0009] Optionally, a first insulating gasket is provided on the inner wall of the housing.

[0010] Optionally, the printed circuit board assembly includes a first printed circuit board assembly and a second printed circuit board assembly, wherein the first printed circuit board assembly and the second printed circuit board assembly are connected by a plurality of pillars.

[0011] Optionally, a second insulating pad is also provided between the printed circuit board assembly and the base assembly.

[0012] Optionally, the housing and the base assembly are sealed by laser welding.

[0013] This invention provides a field-effect transistor (FET) isolation drive device, which can realize the isolated control and drive of FETs and the detection of FET switching status, thereby improving system safety, testability and environmental adaptability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 An exploded view of a field-effect transistor isolation drive device provided in an embodiment of this utility model; Figure 2 A schematic diagram of the assembly of a field-effect transistor isolation drive device provided in an embodiment of this utility model; Figure 3 A schematic diagram of the circuit principle of a field-effect transistor isolation drive device provided for an embodiment of this utility model; Figure 4 A schematic diagram of a digital isolation control circuit provided for an embodiment of this utility model; Figure 5 A schematic diagram of an isolated boost circuit provided for an embodiment of this utility model; Figure 6 This is a schematic diagram of an output driving circuit provided for an embodiment of the present invention.

[0016] In the diagram: 1. Outer shell, 2. First insulating pad, 3. First printed circuit board assembly, 4. Support column, 5. Second printed circuit board assembly, 6. Second insulating pad, 7. Base assembly, 8. Digital isolation control circuit, 9. Isolation boost circuit, 10. Output drive circuit, 11. Target field-effect transistor, 12. Control chip. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Figure 1 This is an exploded view of a field-effect transistor isolation drive device according to an embodiment of the present invention. Figure 2 This is an assembly schematic diagram of a field-effect transistor isolation drive device according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, it includes: a housing 1, a printed circuit board assembly disposed inside the housing 1, a base assembly 7 disposed at the bottom of the housing 1, a plurality of lead-out rods disposed on the base assembly 7, and the printed circuit board assembly being fixed on the base assembly 7 and electrically connected to the plurality of lead-out rods.

[0019] Figure 3 This is a schematic diagram of the circuit principle of a field-effect transistor isolated drive device according to an embodiment of the present invention. Figure 3 As shown, the printed circuit board integrates a digital isolation control circuit 8, an isolation boost circuit 9, and an output drive circuit 10.

[0020] Figure 4 This is a schematic diagram of a digital isolation control circuit according to an embodiment of the present invention. Figure 5 This is a schematic diagram of an isolated boost circuit according to an embodiment of the present invention. Figure 6 This is a schematic diagram of an output driving circuit provided according to an embodiment of the present utility model.

[0021] Specifically, the input terminal of the isolation boost circuit 9 is connected to the external power supply VCC1 and the ground terminal GND. The output isolation voltage terminals VCC2 and VCC3 of the isolation boost circuit 9 are connected to the power supply terminals of the digital isolation control circuit 8 and the output drive circuit 10, respectively. The output isolation ground terminal ISO_GND of the isolation boost circuit 9 is connected to the ground terminal of the target field-effect transistor 11.

[0022] The digital isolation control circuit 8 is connected to the control chip 12. The data register output terminal of the digital isolation control circuit 8 is connected to the output drive circuit 10. The output drive circuit 10 is connected to the control terminal of the target field-effect transistor 11. The status output terminal of the target field-effect transistor 11 is connected to the digital isolation control circuit 8.

[0023] Specifically, the input terminal of the digital isolation control circuit 8 is connected to the output terminal of the control chip 12, the feedback input terminal of the digital isolation control circuit 8 is connected to the state output terminal of the target field-effect transistor 11, and the feedback output terminal of the digital isolation control circuit 8 is connected to the input terminal of the control chip 12.

[0024] The digital isolation control circuit 8 is used to output the corresponding isolated data register signal DR to the output drive circuit 10 based on the control signal IN of the control chip 12, and to output the corresponding isolated feedback signal Fbk to the control chip 12 based on the logic level signal (JC) of the target field-effect transistor 11.

[0025] like Figure 3 As shown, the power supply terminal of the digital isolation control circuit 8 is also connected to the external power supply VCC1.

[0026] Specifically, the external power supply VCC1 and the ground terminal GND supply power to the drive device. The external power supply VCC1 passes through the isolation boost circuit 9, outputting VCC2 and VCC3, and outputting the isolation ground ISO_GND. The digital isolation control circuit 8 is powered by VCC1 and VCC2, and the output drive circuit 10 is powered by VCC3. When the control signal IN from the external control chip 12 is low / high, the digital isolation control circuit 8 outputs the corresponding isolation data register signal DR to the output drive circuit 10. The output drive circuit 10 outputs the circuit signal OUT to turn the field-effect transistor off / on. The digital isolation control circuit 8 isolates the received logic level signal JC from the target field-effect transistor 11 and outputs the field-effect transistor contact off / on state (i.e., the isolation feedback signal) Fkb to the control chip 12.

[0027] Preferably, the control chip 12 includes a digital signal processor (DSP) and a micro controller unit (MCU).

[0028] Specifically, such as Figure 1 As shown, a first insulating pad 2 is provided on the inner wall of the outer casing 1.

[0029] Preferably, such as Figure 1As shown, the printed circuit board assembly includes a first printed circuit board assembly 3 and a second printed circuit board assembly 5, which are connected by multiple supports 4. For example, the first printed circuit board assembly 3 and the second printed circuit board assembly 5 are welded together by nine supports 4.

[0030] Preferably, a second insulating pad 6 is also provided between the printed circuit board assembly and the base assembly 7.

[0031] Preferably, the outer casing 1 and the base assembly 7 are sealed by laser welding.

[0032] In one optional embodiment of this utility model, nine support pillars 4 are first welded to the second printed circuit board assembly 5. The second printed circuit board assembly 5 is horizontally welded and fixed by eight lead-out rods. Before welding, a second insulating gasket 6 is inserted between the base assembly 7 and the second printed circuit board assembly 5. The first printed circuit board assembly 3 is welded to the second printed circuit board assembly 5 by the nine support pillars 4, and the entire circuit electrical connection is completed. Then, the entire assembly is covered by the outer shell 1. The outer shell 1 is isolated from the internal printed circuit board assembly by the first insulating gasket 2. Finally, the drive device is sealed by relay laser welding process.

[0033] In this embodiment of the utility model, the first printed circuit board group 3 and the second printed circuit board group 5 integrate all circuit devices, and the main input and output interfaces are the eight lead-out rods at the bottom of the base group 7.

[0034] In one optional embodiment of this utility model, the digital isolation control circuit 8 and the isolation boost circuit 9 are distributed in the first printed circuit board group 3, and the output drive circuit 10 is distributed in the second printed circuit board group 5.

[0035] This utility model provides a field-effect transistor isolation drive device that integrates the drive, magnetic isolator, rectification, and filtering circuits into a modular design. It adopts a hot-start method to enable rapid voltage output of the drive field-effect transistor, achieving a fast response speed. It detects the switch status and feeds it back to the control system through an isolation signal, eliminating the need to build other circuits for detection. It uses a standard relay structure and sealing technology, making the structure universal and effectively enhancing environmental adaptability and improving reliability.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A field-effect transistor isolated drive device, characterized in that, include: The enclosure contains a printed circuit board assembly, and a base assembly is located at the bottom of the enclosure. Multiple lead-out rods are mounted on the base assembly. The printed circuit board assembly is fixed to the base assembly and electrically connected to the multiple lead-out rods. The printed circuit board assembly integrates a digital isolation control circuit, an isolation boost circuit, and an output drive circuit. The input terminal of the isolation boost circuit is connected to an external power supply and a ground terminal. The output isolation voltage terminal of the isolation boost circuit is connected to the power supply terminal of the digital isolation control circuit and the power supply terminal of the output drive circuit, respectively. The output isolation ground terminal of the isolation boost circuit is connected to the ground terminal of the target field-effect transistor. The digital isolation control circuit is connected to the control chip, the data register output terminal of the digital isolation control circuit is connected to the output drive circuit, the output drive circuit is connected to the control terminal of the target field-effect transistor, and the status output terminal of the target field-effect transistor is connected to the digital isolation control circuit. The digital isolation control circuit is used to output a corresponding isolated data register signal to the output drive circuit based on the control signal of the control chip, and to output a corresponding isolated feedback signal to the control chip based on the logic level signal of the target field-effect transistor.

2. The field-effect transistor isolation drive device according to claim 1, characterized in that: The power supply terminal of the digital isolation control circuit is also connected to an external power source.

3. The field-effect transistor isolation drive device according to claim 1, characterized in that: The input terminal of the digital isolation control circuit is connected to the output terminal of the control chip, the feedback input terminal of the digital isolation control circuit is connected to the state output terminal of the target field-effect transistor, and the feedback output terminal of the digital isolation control circuit is connected to the input terminal of the control chip.

4. The field-effect transistor isolation drive device according to claim 1, characterized in that: The control chip includes a digital signal processor and a microcontroller.

5. The field-effect transistor isolation drive device according to claim 1, characterized in that: The inner wall of the outer casing is provided with a first insulating gasket.

6. The field-effect transistor isolation drive device according to claim 1, characterized in that: The printed circuit board assembly includes a first printed circuit board assembly and a second printed circuit board assembly, which are connected by multiple support pillars.

7. The field-effect transistor isolation drive device according to claim 1, characterized in that: A second insulating pad is also provided between the printed circuit board assembly and the base assembly.

8. The field-effect transistor isolation drive device according to claim 1, characterized in that: The outer casing and the base assembly are sealed by laser welding.

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