A MOSFET opening detection system and method

Abstract

The present invention relates to a MOSFET opening detection system and method, the system includes an adjustable constant current power supply, a switching power supply, a MOSFET opening detection device, a power box and a target board to be tested; the MOSFET opening detection device includes an MCU1 and its peripheral circuits, a relay and its driving circuit, a current signal detection circuit, a WIFI module and its peripheral circuits and a signal trigger driving circuit; the target board to be tested includes a MOSFET, an MCU2 and its driving circuit and a signal conversion circuit; the power box serves as a driving load for the MOSFET. The present invention adopts an external adjustable constant current power supply as the power supply of the target board to be tested, an external switching power supply as the system power supply of the MOSFET opening detection device, and the MOSFET opening detection device is connected to a computer through a WIFI module to realize the sending of computer instructions and the return of monitoring data; after repeated tests for many times, the actual opening result of the MOSFET is obtained, and the MOSFET opening is accurately measured, which helps to understand the design process of the controller and minimize the heat generation of the controller.

Description

Technical Field

[0001] The invention belongs to the technical field of semiconductor device testing, and in particular relates to a MOSFET opening detection system and method. Background Art

[0002] At present, the lights and motors on cars mainly use MOSFET (metal-oxide semiconductor field-effect transistor) as the driving chip. The design of the driving circuit is mainly based on the voltage and current parameters provided by the chip data. Whether the MOSFET working parameters meet the design requirements requires measuring its actual opening. The so-called opening, the larger the opening, the greater the water flow in the pipe; the same is true for the current, the larger the opening, the greater the current in the line, and the opening size of the MOSFET will affect the voltage drop and redundancy of the MOSFET. Accurately measuring the opening of the MOSFET can guide the design process of the controller and minimize the heat generated by the controller. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a MOSFET opening detection system and method to avoid the problem of controller short circuit and heating caused by excessive MOSFET opening.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A MOSFET opening detection system comprises an adjustable constant current power supply, a switching power supply, a MOSFET opening detection device, a power box and a target board to be tested;

[0006] The adjustable constant current power supply is used to provide a preset current value to the target board under test and the power box, and the preset current value will not cause a short circuit in the target board under test;

[0007] The switching power supply is used to provide a test rated voltage to the MOSFET opening detection device;

[0008] The MOSFET opening detection device includes an MCU1 and its peripheral circuits, a relay and its driving circuit, a current signal detection circuit, a WIFI module and its peripheral circuits, and a signal trigger driving circuit; the MOSFET opening detection device is connected to a computer through the WIFI module to receive a detection start instruction issued by the computer and return monitoring data to the computer;

[0009] The target board to be tested includes MOSFET, MCU2 and its driving circuit and signal conversion circuit;

[0010] The power box serves as a driving load for the MOSFET;

[0011] The adjustable constant current power supply and the switching power supply are both connected in series with the MOSFET opening detection device, the power box collects the power output information of the MOSFET, the target board under test is connected with the MOSFET opening detection device by electrical signals, and the adjustable constant current power supply is also connected with the MOSFET opening detection device for communication.

[0012] To further improve the above technical solution, MCU1 is communicatively connected to the WIFI module, and MCU1 is connected to the relay drive circuit; one end of the first group of contacts of the relay is connected to the positive input interface of the adjustable constant current power supply, and the other end is connected to the positive connection interface of the test output; one end of the second group of contacts of the relay is connected to the negative input interface of the adjustable constant current power supply, and the other end is connected to the negative output interface of the test output through a milliohm resistor.

[0013] Furthermore, the electrical signal connection between the target board to be tested and the MOSFET opening detection device includes: the output end of the signal trigger drive circuit is electrically connected to the input end of the signal conversion circuit.

[0014] Furthermore, the MCU2 is connected to the gate of the MOSFET through the driving circuit, the source of the MOSFET is connected to the power output terminal of the target board under test, and the drain of the MOSFET is connected to the positive power input interface of the target board under test.

[0015] The present invention also relates to a MOSFET opening detection method, which is based on the above-mentioned MOSFET opening detection system and comprises the following steps:

[0016] S1: After completing the system initialization, the computer sends a detection start command, turns on the adjustable constant current power supply, and the MOSFET opening detection device connects the adjustable constant current power supply to the target board under test;

[0017] S2: After receiving the detection start instruction, the WIFI module forwards it to MCU1, and MCU1 delays sending the trigger signal to the input end of the signal conversion circuit of the target board under test through the output end of the signal trigger driving circuit;

[0018] S3: After receiving the trigger signal, the target board under test runs the program under test according to the test logic and turns on the MOSFET to perform an opening test;

[0019] S4: The MOSFET opening detection device records the current data in real time and feeds it back to the computer. After MCU1 determines that a cycle of monitoring is completed, it uses the interrupt program to collect and store data;

[0020] S5: MCU1 determines whether the data stored in step S4 reaches the data packet capacity that can start the WIFI module to send data. If so, the WIFI module is started to send data to the computer; if not, the next monitoring is started and returns to step S2.

[0021] To further improve the above technical solution, in step S4, the MOSFET opening detection device records the current data in real time and feeds it back to the computer, including:

[0022] After turning on the MOSFET, the power box collects power output data and feeds it back to the MOSFET opening detection device. The MOSFET opening detection device converts the current data through the milliohm resistor and finally sends it to the computer through the WIFI module. The computer continuously increases the current value and outputs it to the MOSFET opening detection device. The MOSFET opening detection device sends the current change information to the adjustable constant current power supply. The MOSFET opening detection device records the current data in real time and feeds it back to the computer.

[0023] Further, in step S4, collecting data by using interruption includes:

[0024] MCU1 enters the interrupt routine, the high-speed ADC of MCU1 reads and receives data, and clears the interrupt flag to prepare for the next data reception.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention discloses a MOSFET opening detection system and method. An external adjustable constant current power supply is used as the power supply of a target board to be tested, and an external switching power supply is used as the system power supply of a MOSFET opening detection device. The MOSFET opening detection device is connected to a computer through a WIFI module to realize the sending of computer instructions and the return of monitoring data. After repeated tests, the actual opening result of the MOSFET is obtained, and the MOSFET opening is accurately measured, which helps to understand the design process of the controller and minimize the heat generation of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a MOSFET opening detection system according to an embodiment of the present invention;

[0028] Figure 2 A flow chart of a MOSFET opening detection method according to an embodiment;

[0029] Figure 3 The present invention is a flowchart of an interruption program in a MOSFET opening detection method according to an embodiment. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0031] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] See also Figure 1 , a MOSFET opening detection system of a specific embodiment includes an adjustable constant current power supply, a switching power supply, a MOSFET opening detection device, a power box and a target board to be tested;

[0034] The adjustable constant current power supply is used to provide a preset current value to the target board under test and the power box, and the preset current value will not cause a short circuit in the target board under test;

[0035] The switching power supply is used to provide a test rated voltage to the MOSFET opening detection device;

[0036] The MOSFET opening detection device includes an MCU1 and its peripheral circuits, a relay and its driving circuit, a current signal detection circuit, a WIFI module and its peripheral circuits, and a signal trigger driving circuit; the MOSFET opening detection device is connected to a computer through the WIFI module to receive a detection start instruction issued by the computer and return monitoring data to the computer;

[0037] The target board to be tested includes MOSFET, MCU2 and its driving circuit and signal conversion circuit;

[0038] The power box serves as a driving load for the MOSFET;

[0039] The target board to be tested is connected with the MOSFET opening detection device via electrical signals, and the adjustable constant current power supply is also connected with the MOSFET opening detection device via communication.

[0040] A MOSFET opening detection system of the embodiment adopts an external adjustable constant current power supply as the power supply of the target board to be tested, an external switching power supply as the system power supply of the MOSFET opening detection device, and the MOSFET opening detection device is connected to a computer through a WIFI module to realize the sending of computer instructions and the return of monitoring data; after repeated tests for many times, the actual opening result of the MOSFET is obtained, and the MOSFET opening is accurately measured, which helps to understand the design process of the controller and minimize the heat generation of the controller.

[0041] Among them, the sending pin of the MCU1 serial port is connected to the receiving pin of the WIFI module, the receiving pin of the MCU1 serial port is connected to the sending pin of the WIFI module, and the MCU1 is connected to the relay drive circuit; one end of the first group of contacts of the relay is connected to the positive input interface of the adjustable constant current power supply, and the other end is connected to the positive connection interface of the test output; one end of the second group of contacts of the relay is connected to the negative input interface of the adjustable constant current power supply, and the other end is connected to the negative output interface of the test output through a milliohm resistor.

[0042] In this way, the relay acts as the main switch of the adjustable constant current power supply, and the voltage drop across both ends is 0V.

[0043] The electrical signal connection between the target board to be tested and the MOSFET opening detection device includes: the output end of the signal trigger driving circuit is electrically connected to the input end of the signal conversion circuit.

[0044] In this way, the instructions sent by the computer can be forwarded to the target board under test after passing through the MOSFET opening detection device.

[0045] Among them, MCU2 is connected to the gate of MOSFET after driving circuit, the source of MOSFET is connected to the power output end of the target board under test, and the drain of MOSFET is connected to the positive input interface of the power supply of the target board under test.

[0046] The present invention also provides a MOSFET opening detection method, which is based on the above-mentioned MOSFET opening detection system and includes the following steps:

[0047] S1: After completing the system initialization, the computer sends a detection start command, turns on the adjustable constant current power supply, and the MOSFET opening detection device connects the adjustable constant current power supply to the target board under test;

[0048] S2: After receiving the detection start instruction, the WIFI module forwards it to MCU1, and MCU1 delays 100ms and sends the trigger signal to the input end of the signal conversion circuit of the target board under test through the output end of the signal trigger driving circuit;

[0049] S3: After receiving the trigger signal, the target board under test runs the program under test according to the test logic and turns on the MOSFET to perform an opening test;

[0050] S4: The MOSFET opening detection device records the current data in real time and feeds it back to the computer. After MCU1 determines that a cycle of monitoring is completed, it uses the interrupt program to collect and store data;

[0051] S5: MCU1 determines whether the data stored in step S4 reaches the data packet capacity that can start the WIFI module to send data. If so, the WIFI module is started to send data to the computer; if not, the next monitoring is started and returns to step S2.

[0052] In this way, after repeated tests, the actual opening result of the MOSFET is finally obtained through statistical analysis to guide the design process of the controller.

[0053] In the step S3, the step of turning on the MOSFET for the opening test includes: after the signal input end of the signal conversion circuit of the target board receives the trigger signal, it sends it to MCU2 via the signal conversion circuit, and MCU2 turns on the MOSFET via its driving circuit to perform the opening test.

[0054] Wherein, in step S4, the MOSFET opening detection device records the current data in real time and feeds back the data to the computer, including:

[0055] After turning on the MOSFET, the power box collects power output data and feeds it back to the MOSFET opening detection device. The MOSFET opening detection device converts the current data through the milliohm resistor and finally sends it to the computer through the WIFI module. The computer continuously increases the current value and outputs it to the MOSFET opening detection device. The MOSFET opening detection device sends the current change information to the adjustable constant current power supply. The MOSFET opening detection device records the current data in real time and feeds it back to the computer.

[0056] Wherein, in step S4, collecting data by using interruption includes:

[0057] MCU1 enters the interrupt routine, the high-speed ADC of MCU1 reads and receives data, and clears the interrupt flag to prepare for the next data reception.

[0058] In this way, the data required for measuring the MOSFET opening is collected, and after the ADC completes the collection, it will notify MCU1 through the interrupt program.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A MOSFET opening detection system, characterized in that: It includes an adjustable constant current power supply, a switching power supply, a MOSFET opening detection device, a power box and a target board to be tested; The adjustable constant current power supply is used to provide a preset current value to the target board under test and the power box, and the preset current value will not cause a short circuit in the target board under test; The switching power supply is used to provide a test rated voltage to the MOSFET opening detection device; The MOSFET opening detection device includes an MCU1 and its peripheral circuits, a relay and its driving circuit, a current signal detection circuit, a WIFI module and its peripheral circuits, and a signal trigger driving circuit; the MOSFET opening detection device is connected to a computer through the WIFI module to receive a detection start instruction issued by the computer and return monitoring data to the computer; The target board to be tested includes MOSFET, MCU2 and its driving circuit and signal conversion circuit; The power box serves as a driving load for the MOSFET; The target board to be tested is connected with the MOSFET opening detection device by electrical signals, and the adjustable constant current power supply is also connected with the MOSFET opening detection device by communication; MCU1 is connected to the WIFI module for communication, and MCU1 is connected to the relay drive circuit; one end of the first group of contacts of the relay is connected to the positive input interface of the adjustable constant current power supply, and the other end is connected to the positive connection interface of the test output; one end of the second group of contacts of the relay is connected to the negative input interface of the adjustable constant current power supply, and the other end is connected to the negative output interface of the test output through a milliohm resistor.

2. A MOSFET opening detection system according to claim 1, characterized in that: The electrical signal connection between the target board to be tested and the MOSFET opening detection device includes: the output end of the signal trigger driving circuit is electrically connected to the input end of the signal conversion circuit.

3. A MOSFET opening detection system according to claim 1, characterized in that: MCU2 is connected to the gate of MOSFET through the driving circuit, the source of MOSFET is connected to the power output terminal of the target board under test, and the drain of MOSFET is connected to the positive power input interface of the target board under test.

4. A MOSFET opening detection method, characterized in that: This method is based on a MOSFET opening detection system according to any one of claims 1 to 3, and comprises the following steps: S1: After completing the system initialization, the computer sends a detection start command, turns on the adjustable constant current power supply, and the MOSFET opening detection device connects the adjustable constant current power supply to the target board under test; S2: After receiving the detection start instruction, the WIFI module forwards it to MCU1, and MCU1 delays sending the trigger signal to the input end of the signal conversion circuit of the target board under test through the output end of the signal trigger driving circuit; S3: After receiving the trigger signal, the target board under test runs the program under test according to the test logic and turns on the MOSFET to perform an opening test; S4: The MOSFET opening detection device records the current data in real time and feeds it back to the computer. After MCU1 determines that a cycle of monitoring is completed, it uses the interrupt program to collect and store data; S5: MCU1 determines whether the data stored in step S4 reaches the data packet capacity that can start the WIFI module to send data. If so, the WIFI module is started to send data to the computer; if not, the next monitoring is started and returns to step S2.

5. A MOSFET opening detection method according to claim 4, characterized in that: In step S4, the MOSFET opening detection device records the current data in real time and feeds it back to the computer, including: After turning on the MOSFET, the power box collects power output data and feeds it back to the MOSFET opening detection device. The MOSFET opening detection device converts the current data through the milliohm resistor and finally sends it to the computer through the WIFI module. The computer continuously increases the current value and outputs it to the MOSFET opening detection device. The MOSFET opening detection device sends the current change information to the adjustable constant current power supply. The MOSFET opening detection device records the current data in real time and feeds it back to the computer.

6. A MOSFET opening detection method according to claim 4, characterized in that: In step S4, collecting data using an interrupt program includes: MCU1 enters the interrupt routine, the high-speed ADC of MCU1 reads and receives data, and clears the interrupt flag to prepare for the next data reception.

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