TW202400430A - Power supply circuit for vehicle and control circuit for vehicle - Google Patents

Abstract

A power supply circuit for vehicle is applied to a microcontroller of an engine control unit which has a power supply terminal and includes a diode, a transient voltage suppression diode, a inductance, a first capacitor and a second capacitor. One terminal of the diode is connected to a power supply line, and the other terminal of the diode is connected to the power supply terminal. One terminal of the transient voltage suppression diode is connected to the diode and the power supply terminal, and the other terminal of the transient voltage suppression diode is connected to a ground terminal. The reverse standoff voltage of the transient voltage suppression diode is 22V. One terminal of the inductance is connected to the transient voltage suppression diode. One terminal of the first capacitor is connected to the other terminal of the inductance and the power supply terminal, and the other terminal of the first capacitor is connected to the ground terminal. One terminal of the second capacitor is connected to the terminal of the inductance which is connected to the first capacitor, and the other terminal of the second capacitor is connected to the ground terminal.

Description

Vehicle power supply circuit and vehicle control circuit

The present invention relates to the technical field of automotive circuits, in particular to a vehicle power supply circuit and a vehicle control circuit.

With the development of autonomous driving and advanced driver assistance systems, various types of automotive circuits have emerged, making automotive circuit design increasingly important and occupy an important position. The increase in vehicle circuits in the vehicle system means that the control system of the engine control unit (ECU) has changed, and the vehicle's communication system and safety system have also changed accordingly. Therefore, under the premise of considering the safety and reliability of the vehicle, it is necessary to conduct a transient conducted emission test on the engine control unit to determine whether the engine control unit can operate normally under pulse interference.

The reference standard for transient conducted emission testing is ISO7637-2:2011(E), which includes using the pulse 2a waveform to simulate the sudden interruption of current in a device connected in parallel with the device under test (DUT) due to the winding inductance. Transient phenomena. The waveform of pulse 2a is a positive pulse, which is a pulse interference with fast speed and small energy in the entire transient conducted emission test. However, when current common engine control units perform pulse 2a waveform testing, the measurement data of the Local Interconnect Network (LIN) bus often shows several error frames, causing the engine control unit to fail to reach normal working status. Fails transient conducted emissions test.

Based on the above purpose, the present invention provides a vehicle power supply circuit and a vehicle control circuit that can pass the pulse 2a waveform test emitted by transient conduction, thereby allowing the engine control unit to operate normally under pulse interference.

A vehicle power supply circuit according to an embodiment of the present invention is suitable for a microcontroller of an engine control unit. The microcontroller includes a power port. The vehicle power supply circuit includes a diode, a transient voltage suppression diode, an inductor, and a third a capacitor and a second capacitor. One end of the diode is connected to the power cord, and the other end of the diode is connected to the power port. One end of the transient voltage suppression diode is connected to the diode and the power port, and the other end of the transient voltage suppression diode is connected to the ground terminal. The reverse turn-off voltage of the transient voltage suppression diode is 22V. One end of the inductor is connected to a transient voltage suppression diode. One end of the first capacitor is connected to the other end of the inductor and the power port, and the other end of the first capacitor is connected to the ground end. One end of the second capacitor is connected to the end of the inductor connected to the first capacitor and the power port, and the other end of the second capacitor is connected to the ground end.

A vehicle control circuit according to an embodiment of the present invention is suitable for an engine control unit. The vehicle control circuit includes the aforementioned vehicle power supply circuit, a second transient voltage suppression diode, a second inductor and a third capacitor. Wherein, the transient voltage suppression diode of the vehicle power supply circuit is a first transient voltage suppression diode, and the inductor of the vehicle power supply circuit is a first inductor. The microcontroller also includes signal ports for connecting signal lines. One end of the second transient voltage suppression diode is connected to the signal port and the signal line, and the other end of the second transient voltage suppression diode is connected to the ground terminal. One end of the second inductor is connected to the signal port, and the other end of the second inductor is connected to the second transient voltage suppression diode. One end of the third capacitor is connected to the second inductor and the signal port, and the other end of the third capacitor is connected to the ground terminal.

To sum up, the vehicle power supply circuit and vehicle control circuit of the present invention can be tested by the pulse 2a waveform emitted by transient conduction through the transient voltage suppression diode. The microcontroller of the engine control unit can detect the pulse interference during pulse interference. operate normally.

The detailed features and advantages of the present invention are described in detail below in the implementation mode. The content is sufficient to enable anyone skilled in the relevant art to understand the technical content of the present invention and implement it according to the content disclosed in this specification, the patent scope and the drawings. , anyone familiar with the relevant art can easily understand the relevant objectives and advantages of the present invention. The following examples further illustrate the aspects of the present invention in detail, but do not limit the scope of the present invention in any way.

It will be understood that, although the terms "first," "second," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections These terms should not be limited. These terms are only used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section.

Additionally, the term "comprises" refers to the presence of stated features, regions, integers, steps, operations, elements and/or parts but does not exclude the presence of one or more other features, regions, integers, steps, operations, elements, parts and/or or the presence or addition of a combination thereof.

Please refer to FIG. 1 , which is a configuration diagram of a vehicle power supply circuit according to an embodiment of the present invention. As shown in Figure 1, the vehicle power supply circuit 1 is suitable for the microcontroller M1 of the engine control unit. The microcontroller M1 includes a power port VS1. The vehicle power supply circuit 1 includes a diode 10 and a transient voltage suppression diode 20. , inductor 30, first capacitor 40 and second capacitor 50. One end of the diode 10 is connected to the power line VCC, and the other end of the diode 10 is connected to the power port VS1. Furthermore, one end of the diode 10 may be an anode, and the other end of the diode 10 may be a cathode. One end of the transient voltage suppression diode 20 is connected to the diode 10 and the power port VS1, the other end of the transient voltage suppression diode 20 is connected to the ground terminal GND, and the reverse turn-off voltage of the transient voltage suppression diode 20 is is 22V. One end of the inductor 30 is connected to the transient voltage suppression diode 20 . One end of the first capacitor 40 is connected to the other end of the inductor 30 and the power port VS1, and the other end of the first capacitor 40 is connected to the ground terminal GND. One end of the second capacitor 50 is connected to the end of the inductor 30 connected to the first capacitor C1 and the power port VS1, and the other end of the second capacitor 50 is connected to the ground terminal GND.

In other words, the transient voltage suppression diode 20 is connected to the diode 10 and the inductor 30. The inductor 30 is also connected to the first capacitor 40 and the second capacitor 50. The inductor 30 is located between the first capacitor 40 and the transient voltage suppression diode. 20, the first capacitor 40 and the second capacitor 50 are connected in parallel.

For example, the model of the diode 10 can be BAS21, the model of the transient voltage suppression diode 20 can be TPSMAJ22CA, the model of the inductor 30 can be BLM18PG221SZ1D, the capacitance value of the first capacitor 40 can be 100nF, and the capacitance value of the second capacitor can be 100nF. A capacitor value of 50 would be 4.7 F.

Under the pulse 2a waveform test of the transient conduction emission of the engine control unit including the vehicle power supply circuit 1, the diode 10 is in the forward bias state, the transient voltage suppression diode 20 is in the reverse bias state, and the diode 10 is in the power supply state. The line VCC receives the pulse voltage. The transient voltage suppression diode 20 reduces the maximum voltage value of the pulse voltage to 22V. The inductor 30, the first capacitor 40 and the second capacitor 50 reduce the pulse voltage and filter it. The power supply of the microcontroller M1 Port VS1 receives the filtered pulse voltage. The filtered pulse voltage is less than the maximum power supply voltage of the microcontroller M1, so that the measurement data of the LIN bus does not appear in error frames during the test, indicating that the microcontroller M1 can still operate normally under pulse interference. operation. In particular, the transient voltage suppression diode system of TPSMAJ22CA can meet the requirement of no error frame on the LIN bus during the above test. Among the transient voltage suppression diodes, it has the highest collapse voltage, so it can Best choice as transient voltage suppression diode 20.

Please refer to FIG. 2 , which is a configuration diagram of a vehicle control circuit according to an embodiment of the present invention. As shown in Figure 2, the microcontroller M1 includes a power port VS1 and a signal port LIN1. The signal port LIN1 is used to connect the signal line. Specifically, the signal port LIN1 can be connected to the connection port ST1 connected to the signal line, wherein the connection between the signal port LIN1 and the connection port ST1 can be a LIN line, and the signal line is a LIN bus. The vehicle control circuit 2 includes a diode 10, a transient voltage suppression diode 20, an inductor 30, a first capacitor 40, a second capacitor 50, a transient voltage suppression diode 60, an inductor 70 and a third capacitor 80. The configuration and functions of the diode 10 , the transient voltage suppression diode 20 , the inductor 30 , the first capacitor 40 , and the second capacitor 50 are the configuration and functions of the corresponding components in the embodiment shown in FIG. 1 , and will not be used here. To elaborate further. One end of the transient voltage suppression diode 60 is connected to the signal port LIN1 and the connection port ST1, and the other end of the transient voltage suppression diode 60 is connected to the ground terminal GND. One end of the inductor 70 is connected to the signal port LIN1, and the other end of the inductor 70 is connected to the transient voltage suppression diode 60. One end of the third capacitor 80 is connected to the inductor 70 and the signal port LIN1, and the other end of the third capacitor 80 is connected to the ground terminal GND.

In other words, the inductor 70 is located between the transient voltage suppression diode 60 and the third capacitor 80. The connection port ST1, the transient voltage suppression diode 60 and the inductor 70 are connected to each other. The inductor 70, the third capacitor 80 and Signal port LIN1 is interconnected.

For example, the model of the transient voltage suppression diode 60 can be PESD1LIN, the model of the inductor 70 can be BLM18BB121SZ1D, and the capacitance value of the third capacitor 80 can be 220pF.

As mentioned before, the vehicle power supply circuit 1 shown in FIG. 1 can provide the microcontroller M1 with a filtered pulse voltage that is less than the highest power supply voltage of the microcontroller M1 under the transient conduction emission pulse 2a waveform test. Therefore, for the vehicle control circuit 2 that includes the same circuit composition as the vehicle circuit power supply circuit 1, under the pulse 2a waveform test of transient conduction emission, because the power port VS1 of the microcontroller M1 receives less than the microcontroller The pulse voltage of the highest power supply voltage of the microcontroller M1, the signal port LIN1 of the microcontroller M1 can normally output the data signal and is not interfered by the pulse voltage, the inductor 70 and the third capacitor 80 filter the data signal, and the transient voltage suppression diode 60 reduces the maximum voltage value of the filtered data signal to the voltage value of the reverse turn-off voltage of the transient voltage suppression diode 60, and the reduced data signal is transmitted through the connection port ST1.

In summary, the vehicle power supply circuit and vehicle control circuit of the present invention can be tested by the pulse 2a waveform emitted by transient conduction through the transient voltage suppression diode, thereby allowing the microcontroller of the engine control unit to Normal operation under pulse interference.

Although the present invention is disclosed in the foregoing embodiments, they are not intended to limit the present invention. All changes and modifications made without departing from the spirit and scope of the present invention shall fall within the scope of patent protection of the present invention. Regarding the protection scope defined by the present invention, please refer to the attached patent application scope.

1:Vehicle power supply circuit 2: Vehicle control circuit 10: Diode 20, 60: Transient voltage suppression diode 30,70:Inductor 40: First capacitor 50: Second capacitor 80: The third capacitor GND: ground terminal LIN1: Signal port M1: Microcontroller ST1: connection port VCC: power cord VS1: power port

FIG. 1 is a configuration diagram of a vehicle power supply circuit according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a vehicle control circuit according to an embodiment of the present invention.

1:Vehicle power supply circuit

10: Diode

20: Transient voltage suppression diode

30:Inductor

40: First capacitor

50: Second capacitor

GND: ground terminal

M1: Microcontroller

VCC: power cord

VS1: power port

Claims (10)

A vehicle power supply circuit is suitable for a microcontroller of an engine control unit. The microcontroller includes a power port. The vehicle power supply circuit includes: A diode, one end of the diode is connected to a power cord, and the other end of the diode is connected to the power port; A transient voltage suppression diode, one end of the transient voltage suppression diode is connected to the diode and the power port, and the other end of the transient voltage suppression diode is connected to a ground terminal, wherein the transient voltage suppression diode The reverse turn-off voltage of the diode is 22V; An inductor, one end of which is connected to the transient voltage suppression diode; a first capacitor, one end of the first capacitor is connected to the other end of the inductor and the power port, and the other end of the first capacitor is connected to the ground terminal; and A second capacitor, one end of the second capacitor is connected to the end of the inductor connected to the first capacitor and the power port, and the other end of the second capacitor is connected to the ground end. The vehicle power supply circuit as described in claim 1, wherein the model of the transient voltage suppression diode is TPSMAJ22CA. The vehicle power supply circuit as claimed in claim 1, wherein the capacitance value of the first capacitor is 100 nF. The vehicle power supply circuit as claimed in claim 1, wherein the capacitance value of the second capacitor is 4.7 F. The vehicle power supply circuit as described in claim 1, wherein the model of the inductor is BLM18PG221SZ1D. The vehicle power supply circuit as described in claim 1, wherein the model of the diode is BAS21. A vehicle control circuit, suitable for an engine control unit, the vehicle control circuit includes: The vehicle power supply circuit of any one of claims 1 to 6, wherein the transient voltage suppression diode is a first transient voltage suppression diode, and the inductor is a first inductor; The microcontroller further includes a signal port for connecting to a signal line; a second transient voltage suppression diode, one end of the second transient voltage suppression diode is connected to the signal port and the signal line, and the other end of the second transient voltage suppression diode is connected to the ground terminal; a second inductor, one end of the second inductor is connected to the signal port, and the other end of the second inductor is connected to the second transient voltage suppression diode; and A third capacitor, one end of the third capacitor is connected to the second inductor and the signal port, and the other end of the third capacitor is connected to the ground terminal. The vehicle control circuit as described in claim 7, wherein the model of the second transient voltage suppression diode is PESD1LIN. The vehicle control circuit as claimed in claim 7, wherein the capacitance value of the third capacitor is 220pF. The vehicle control circuit as described in claim 7, wherein the model of the second inductor is BLM18BB121SZ1D.

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