KR20180067132A - An Apparatus and A Method For Testing A Motor Driving IC - Google Patents

Abstract

According to an embodiment of the present invention, provided is a device to diagnose the malfunction of a motor driving IC, in a motor controller including a microcontroller unit, a driving IC, and a power device module. The driving IC includes: an operating part controlling the power device module by receiving a driving control signal from the microcontroller unit; a high side (HS) malfunction detecting part detecting an abnormality of a drain-source voltage of an HS driving switch of the power device module; a low side (LS) malfunction detecting part detecting an abnormality of a drain-source voltage of an LS driving switch of the power device module; a feedback malfunction detecting part detecting a voltage abnormality of a shunt resistor connected in series between the power device module and a ground connection; and a malfunction determining part determining whether the abnormalities of the HS malfunction detecting part, the LS malfunction detecting part, and the feedback malfunction detecting part last for no less than a predetermined time.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to an apparatus and method for diagnosing a fault in a motor drive IC, and more particularly, to a motor drive IC capable of detecting a drain-source voltage of a power device in a motor drive IC, And more particularly, to an apparatus and method for diagnosing a fault in a motor drive IC.

2. Description of the Related Art [0002] In recent years, automotive technologies have been actively applied to electric, electronic, and information communication technologies. Accordingly, electronic control units (ECUs) for controlling various automobile components such as engines, powertrains, Demand is increasing day by day. Accordingly, the performance of the vehicle controller has been greatly improved, and various methods for maximizing the performance of the vehicle through the vehicle controller have been devised.

Further, in order to satisfy such a demand, a considerable number of electronic devices are installed inside the vehicle, so that the stability of the electronic devices inside the vehicle becomes more and more important.

However, due to the increase in the number of electronic components in the controller, problems such as failure due to an overcurrent may increase the safety of the vehicle. In particular, damage to the controller may be caused by disconnection, short-circuiting of the battery, and short-circuiting of the ground. Therefore, there is a need to use a fault diagnosis circuit in the controller in order to overcome such an overcurrent abnormality.

In order to enhance the stability of the controller, the conventional art continuously feedbacks the current to determine the failure of the controller. However, this can not be diagnosed when an overcurrent flows through a path where current feedback is not possible, which may cause damage to the controller if an overcurrent flows through the controller.

The present invention relates to a fault diagnosis method for a motor driving IC that recognizes a drain-source voltage of a power device and recognizes a fault condition and determines a fault when the fault holding time is equal to or longer than a reference time .

A motor drive IC failure diagnosis apparatus according to an embodiment of the present invention includes a micro controller unit; Driving IC; And a power device module, wherein the driving IC includes: a driving unit for receiving a driving control signal from the microcontroller unit and controlling the power device module; An HS fault detection unit for detecting an abnormality of a drain-source voltage of an HS (High Side) drive switch of the power device module; An LS failure detection unit for detecting an abnormality of a drain-source voltage of a LS (Low Side) drive switch of the power device module; A feedback failure detector for detecting a voltage abnormality of the shunt resistor connected in series between the power device module and the ground; And a failure determination unit for determining whether a voltage abnormality of the HS failure detection unit, the LS failure detection unit, and the feedback failure detection unit continues for a reference time or more.

In this case, the driving IC further includes a connection diagnosing unit, and the connection diagnosing unit is configured to diagnose abnormality of the connection state between the motor and the driving IC before the motor driving starts or when the motor driving is stopped .

The feedback failure detecting unit may detect an abnormality by comparing the voltage applied to the shunt resistor with the first reference voltage during driving of the motor.

The HS fault detecting unit detects an abnormality by comparing the drain-source voltage of the HS driving switch and the second reference voltage during driving of the motor, and the LS fault detecting unit detects a fault when the drain of the LS driving switch - The error can be detected by comparing the source voltage with the third reference voltage.

The failure determination unit may include a timing filter to determine whether a voltage abnormality of the HS fault detection unit, the LS fault detection unit, and the feedback failure detection unit is maintained for a reference time or longer.

The fault determination unit may include a first register, a logic operation unit, a timing filter, and a second register, a voltage abnormality signal of the HS fault detection unit is input to the first register, and the logic operation unit stores And a gate control signal of the HS driving switch and outputs the signal to the timing filter. The timing filter counts the logically calculated signal, and when the counted number reaches a reference number of times, And can be applied to the second register.

In addition, the logic operation unit may be configured to perform an AND operation.

Also, the first register and the second register may be D-flip flops.

The output (Q) of the first register is input to the logic operation unit, the inverted phase output (/ Q) of the first register is input to the timing filter, and the timing filter outputs the inverted phase output .

Meanwhile, a motor drive IC failure diagnosis method according to the present invention includes: a micro controller unit; Driving IC; And a motor controller including a power device module, the driving IC receiving the driving control signal of the microcontroller unit to drive the power device module; Determining a current abnormality of the HS driving switch by measuring a drain-source voltage of a HS (High Side) driving switch of the power device module; Measuring a voltage across a shunt resistor connected in series with the power device module to determine a feedback current error; Determining whether the current error of the HS drive switch or the feedback current is longer than a reference time; And stopping the driving of the motor and diagnosing whether the motor is in a failure state if it continues for more than the reference time.

In this case, it may further include determining whether the connection state between the motor and the driving IC is normal before the driving step.

The step of determining the feedback current abnormality may include detecting an abnormality by comparing the voltage applied to the shunt resistor with the first reference voltage during driving of the motor.

The detecting of the failure of the HS driving switch may include detecting an abnormality by comparing the drain-source voltage of the HS driving switch with the second reference voltage during driving of the motor.

The determining whether the current abnormality of the HS driving switch or the feedback current abnormality continues for more than a reference time may include determining whether a current abnormality signal or a feedback current abnormality signal of the HS driving switch, Logic-calculating and outputting a control signal; And counting the logical output and generating a fault signal when the counted number reaches the reference count.

In addition, the step of performing logical operation and outputting may include performing an AND operation.

The apparatus and method for fault diagnosis of a motor drive IC according to the present invention as described above are designed such that a drain-source voltage of a power device is compared with a conventional method in which a fault can not be diagnosed when an overcurrent flows through a path, Compared with the voltage, the reference voltage can be set close to the normal operating voltage range, enabling more accurate fault recognition. In addition, it is possible to prevent the controller from being damaged due to the failure. Of course, the scope of the present invention is not limited by these effects.

1 is a circuit diagram of a motor drive IC failure diagnosis apparatus according to an embodiment of the present invention.
2 is a flowchart of a method for diagnosing a fault in a motor drive IC according to an embodiment of the present invention.
3 is a diagram showing a detailed configuration of a connection diagnosis unit according to an embodiment of the present invention.
4 is a graph for explaining an effect according to an embodiment of the present invention.
5 is a diagram showing a detailed configuration of a feedback failure detecting unit and a failure diagnosis unit according to an embodiment of the present invention.
6 is a diagram showing a detailed configuration of a feedback failure detecting unit and a failure diagnosis unit according to still another embodiment of the present invention.
7 is a diagram showing a detailed configuration of an HS fault detection unit and a fault diagnosis unit according to an embodiment of the present invention.
8 is a graph for explaining the influence of the prior art.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

In addition, in the following embodiments, the terms first, second, and the like are used for the purpose of distinguishing one element from another element, not the limitative meaning.

It is also to be understood that the term " comprising " or " including " in the following embodiments means that a feature or element described in the specification is present and does not preclude the possibility of one or more other features or components being added .

1 is a circuit diagram of a motor drive IC failure diagnosis apparatus according to an embodiment of the present invention. Referring to FIG. 1, a motor drive IC failure diagnosis apparatus according to an embodiment of the present invention includes a drive IC 180 and a microcontroller unit 170.

The power device 100 is a switching device for supplying current to the load 105 based on the gate signal output from the driving IC 180. [ The power device 100 includes a high side drive switch unit 102 and a low side drive switch unit 104. The current flows from the power source V _MOT to the HS drive switch unit 102, (105) and the LS drive switch unit (104) and flows to the shunt resistor (110).

On the other hand, the drain-source voltage of each transistor of the HS driving switch unit 102 is output to the HS diagnosis unit 113 of the driving IC 180 for measurement. The drain-source voltage of each transistor of the LS drive switch unit 104 is output to the LS diagnosis unit 115 of the drive IC 180. [

The shunt resistor 110 is installed to detect the current flowing in the load 105. Here, the load 105 may be a motor or the like. The drive IC 180 can know whether or not an overcurrent flows in the load 105 based on the voltage value caught by the shunt resistor 110. [ For example, the drive IC 180 can recognize a failure when the voltage value across the shunt resistor 110 is greater than the reference voltage value.

The driving IC 180 includes a connection diagnosis unit 150, a failure determination unit 120, a driving unit 140, a control unit 130, a communication unit 160, a power supply unit 165, an HS (High Side) (Low Side) detecting unit and a feedback failure detecting unit 118, and is connected to the shunt resistor 110, the power device 100, and the microcontroller unit 170.

The connection diagnosis unit 150 includes a first connection diagnosis circuit 106 and a second connection diagnosis circuit 107 outside the driving IC 180. When the load 105 is not driven, The connection state between the element and the driving IC 180 can be diagnosed.

3, the microcontroller unit 170 applies the connection diagnosis signals Check_On_1 and Check_On_2 in a state where the respective transistors of the power device 100 are turned off. At this time, the transistors included in the first connection diagnostic circuit 106 and the second connection diagnostic circuit 107 are turned on by the applied voltage. At this time, the divided voltage value of each voltage divider connected to the first connection diagnostic circuit 106 and the second connection diagnostic circuit 107 is applied to the connection diagnosis unit 150 by the connection diagnosis signals Check_Level_1 and Check_Level_2.

In this case, the connection diagnosis unit 150 determines whether or not the connection state is normal and the type of failure such as a battery short circuit (SCB), a ground short circuit (SCG), and a short circuit failure based on the connection diagnosis signals Check_Level_1 and Check_Level_2 It can be judged.

1, the control unit 130 receives a control signal from the microcontroller unit 170 and transmits the control signal to the malfunction determination unit 120, the driving unit 140, the connection diagnosis unit 150, the communication unit 160, It is possible to control the control unit 165.

The driving unit 140 may receive a driving signal such as a PWM (Pulse Width Modulation) signal from the microcontroller unit 170 and may drive the load 105 such as a motor.

The HS fault detection unit 113 is connected to the HS drive switch unit 102 of the power device 100 and receives the drain-source voltage of each transistor of the HS drive switch unit 102 and transmits the drain- do.

The LS failure detecting unit 115 is connected to the LS driving switch unit 104 of the power device 100 and receives the drain-source voltage of each transistor of the LS driving switch unit 104 and transmits the same to the failure determining unit 120 do.

On the other hand, the feedback failure detecting unit 118 is connected to the shunt resistor 110 outside the driving IC, receives the voltage across the shunt resistor, and transmits the voltage to the failure determining unit 120.

Meanwhile, the failure determination unit 120 is connected to the HS (High Side) detection unit 113, the LS failure detection unit 115, and the feedback failure detection unit 118, and detects a voltage value Can be compared with a reference voltage to determine whether an overcurrent failure occurs during driving of the load 105. [

Detailed circuits and operations of the failure determination unit 120, the feedback failure detection unit 118, the HS failure detection unit 113, and the LS failure detection unit 115 will be described below with reference to FIGS. 5 to 7. FIG.

5 shows a detailed configuration of the feedback failure detection unit 118 and the failure determination unit 120 according to the embodiment of the present invention.

5, the feedback failure detection unit 118 includes a first reference voltage source 310 and a comparison unit 315. The failure determination unit 120 includes a first register 410, a logic operation unit 420, A timing filter 430, and a second register 440.

When the load 105 starts to be driven, a current starts to flow in the shunt resistor 110, and a voltage across the shunt resistor 110 is applied to the feedback failure detecting portion 118.

The comparator 315 of the feedback failure detector 118 compares the first reference voltage of the first reference voltage source 310 with the voltage of the shunt resistor 110 to determine whether the voltage applied to the shunt resistor 110 And outputs the overcurrent signal to the first register 410 when the voltage is greater than one reference voltage.

The output voltage is output to the logic operation unit 420 and the timing filter 420 in the first register 410 according to the system clock f_sys.

The output Q of the first register 410 and the inverted phase output / Q of the first register 410 are input to the logic operation unit 420 and the timing filter 420, respectively, (420).

The logic operation unit 420 receives the reference clock Ref_Clock, the gate control signal Gate_ON, and the output Q of the first register 410 as input, and performs a logical operation. In this case, the gate control signal Gate_ON signal is a signal having substantially the same timing and duty ratio as the signal for turning on the gate of the HS driving switch 102 of the power device 100 in the driving unit 140, And may be a signal processed to match the input voltage range of the operation unit 420. Or the gate control signal Gate_ON signal may be a drive control signal for turning on the gate of the HS drive switch 102 in the microcontroller unit 170. [

Thereafter, the logic operation unit 420 ANDs the inputs and outputs the result to the timing filter 430. Accordingly, when the gate of the HS driving switch 102 is turned on and the current of a predetermined level or more flows, the logic operation unit 420 outputs a counting signal to the timing filter 430 that can be counted according to the reference clock Ref_Clock .

The timing filter 430 applies a failure signal to the second register 440 according to the system clock f_sys when the number of counts of the counting signal reaches the reference count x. At this time, the second register 440 may be implemented as a D-flip-flop, for example.

The output failure signal may be output to the microcontroller unit 170, for example, in the second register 440 to transmit a failure signal. The microcontroller unit 170 stops the driving of the HS driving switch 102 or the LS driving switch 104 through the driving control signal in response to a failure, The HS drive switch 102 or the LS drive switch 104 can be driven.

Or may transmit a failure signal to the control unit 130 to stop the driving of the HS driving switch 102 or the LS driving switch 104. [

Such a fault signal may be a fault flag (Flag).

When the failure is detected in the feedback failure detecting unit 118 and then the failure is stopped, the reverse output (/ Q) of the first register is set to an initialization signal (SHUNT_CLEAR) for initializing the counting operation of the timing filter 430, To the timing filter 430. In this case, after the counting operation of the timing filter 430 is initialized and the trouble again occurs, the timing filter 430 starts counting from the beginning.

According to the prior art, a false diagnosis may occur when a sudden current flows in the load 105 that is not in a fault state. For example, when the large current flows temporarily while the duty ratio of the motor load increases at the time of starting, or when the large current flows temporarily (see FIG. 4, 406) A false diagnosis could occur when the passing feedback current exceeds the first reference voltage (see FIG. 4, Vth_F / B).

According to the present invention, it is possible to detect a fault only when a large current over a certain period of time flows through the timing filter 430 of the fault diagnosis unit 120, thereby preventing damage due to misdiagnosis at the time of vehicle operation.

6 shows a detailed configuration of the feedback failure detector 118 and the failure detector 120 according to another embodiment of the present invention. The circuit of Fig. 6 basically has the same configuration as the circuit of Fig. Hereinafter, for the sake of simplicity, the description of the same components as those in Fig. 5 will be omitted.

Referring to FIG. 6, an amplifier circuit 313 may be provided between the feedback failure detecting unit 118 and the shunt resistor 110. The amplifier circuit 313 is configured such that the voltage across the shunt resistor 110 outputs the voltage within the input voltage range required by the feedback failure detecting section 118. [

6, the amplifier circuit 313 is provided outside the driving IC 180, but the amplifier circuit 313 may be provided outside the driving IC 180. [ Those skilled in the art can change the design so that the position of the amplifier circuit 313 is appropriately provided inside or outside the driving IC 180 according to the specifications of the driving IC 180. [

7 is a circuit diagram showing a portion of the fault diagnosis unit 120 connected to the HS fault detection unit 113 and the HS fault detection unit 113 connected to the drain-source of the HS drive switch 102. As shown in FIG.

Basically, the configuration and operation of the fault diagnosis unit 120 are the same as the configuration and operation of the fault diagnosis unit 120 shown in Figs. 5 and 6, and thus the description thereof will be omitted.

7, the HS failure detection unit 113 includes a second reference voltage source 613 and a second comparison unit 615. The failure determination unit 120 includes a third register 610, a logic operation unit 620, ), A timing filter 630, and a fourth register 640.

When a voltage is applied to the gate of the HS drive switch 102, a current flows from the drain terminal to the source terminal of the HS drive switch 102. At this time, the voltage applied to the drain- Is applied to the HS fault detection unit 113.

At this time, the comparator 615 of the HS fault detecting unit 113 compares the second reference voltage of the second reference voltage source 613 with the voltage across the drain-source of the HS driving switch 102, And the overcurrent signal is output to the third register 610 when the voltage applied to the drain-source voltage of the third transistor 610 is greater than the second reference voltage.

The subsequent operation of the failure diagnosis unit 120 is the same as the operation of the failure diagnosis unit 120 shown in Figs. 5 and 6, and a description thereof will be omitted.

Conventionally, a technique of checking whether an overcurrent has occurred by utilizing only the feedback failure detector 118 is used. However, in this case, when a ground short circuit (SCG) occurs in a path that is difficult to predict by only the feedback failure detecting unit 118, for example, in a state of being connected to a motor, a situation may occur in which the overcurrent does not pass through the shunt resistor 110 . Therefore, an overcurrent flows to the HS drive switch 102 or the LS drive switch 104, and there is a risk of breakage of the element or breakage of the controller.

Another prior art has diagnosed the failure by measuring the drain-source voltage of the HS drive switch 102 or the LS drive switch 104. However, since the duty ratio instantaneously increases at the time of starting the motor or when changing the direction, a large current may flow, and therefore, the reference voltage serving as a criterion for determining the failure is set in the high range 401.

However, in the case of normal operation except when starting or switching direction, a current flows in a low range. In FIGS. 4 and 8, the normal operation region 408 shows a normal operation current region during a normal operation, except when a sudden large current can flow in spite of a normal state, such as when starting or switching direction.

Therefore, in spite of the fact that a current is higher than the normal operation, in practice (409), a false diagnosis can occur.

However, as shown in FIG. 5 to FIG. 7, by providing a configuration capable of determining instantaneous large current, for example, a timing filter 403, the reference voltage is lowered as in the reference voltage (Vth_FET The driving IC fault diagnosis apparatus according to the present invention greatly reduces the possibility of false diagnosis.

Therefore, according to the present invention, it is possible to recognize a fault only when a large current over a certain period of time flows through the timing filter 430 of the fault diagnosis unit 120, have.

2 is a flowchart of a method for diagnosing a fault in a motor drive IC according to an embodiment of the present invention.

Referring to FIG. 2, the connection diagnosis unit 150 of the driving IC 180 determines the connection state between the load 105 and the driving IC 180 before driving the motor. (Step S200)

In this case, the microcontroller unit 170 controls the first connection diagnosis circuit 106 and the second connection diagnosis circuit 160 outside the driving IC 180 in a state where the respective transistors of the power device 100 are turned off, (Check_On_1, Check_On_2) is applied to the connection terminal (107). Thereafter, it is possible to check whether the connection state is normal based on the connection diagnosis signals Check_Level_1 and Check_Level_2 output from the first connection diagnosis circuit 106 and the second connection diagnosis circuit 107. [

If the connection state is normal, the motor 105 is turned on (step S202), and the motor monitoring mode is entered. (Step S204)

If the connection status is not normal, it is possible to judge the type of failure in the re-connected state, for example, battery short circuit (SCB), ground short circuit (SCG) and break failure. (Step S212)

In the motor monitoring mode, when the HS fault detection unit 113 and the LS fault detection unit 115 recognize that there is an overcurrent based on the respective drain-source voltages of the HS drive switch 102 and the LS drive switch 104, When the drain-source voltage is higher than the second reference voltage, a failure signal is generated and output to the failure determination unit 120. Or the feedback failure detecting unit 118 generates a failure signal when the voltage across the shunt resistor 110 is higher than the first reference voltage and outputs the failure signal to the failure determining unit 120. [ (Step S206)

The failure determination unit 120 applies timing filters 430 and 630 to determine whether the failure state lasts longer than a reference time. (Step S208)

In this case, the step of determining whether the current abnormality of the HS driving switch 102 or the feedback current abnormality is continued for the reference time or longer may include a current abnormality signal or feedback current abnormality signal of the HS driving switch 102, A step of logically calculating and outputting the gate control signal of the HS drive switch, and a step of counting the logically calculated output to generate a failure signal when the counted number reaches the reference number of times.

If it is determined that the fault state is not maintained for the reference time, the controller 130 repeats steps S204 to S208 while continuing motor drive and fault monitoring.

When the fault state continues for the reference time or longer, the driving of the motor is stopped (step S210), and the fault type can be determined by performing the fault diagnosis step. (Step S212)

After determining the fault type, the fault can be confirmed. (Step S214). After the fault has been confirmed, the entire vehicle may be stopped or a failure mode such as a limp-home mode may be entered so that the vehicle can be safely moved to the garage.

Accordingly, the apparatus and method for diagnosing a motor driving IC according to the present invention can compare a drain-source voltage of a power device with a reference voltage, compared with a conventional method that can not diagnose a fault when an overcurrent flows through a path where current feedback is impossible due to a fault. The reference voltage can be set to be close to the normal operating voltage range, thereby enabling more accurate fault recognition. In addition, it is possible to prevent the controller from being damaged due to the failure. Of course, the scope of the present invention is not limited by these effects.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. Accordingly, the scope of the present invention should be construed as being limited to the embodiments described, and it is intended that the scope of the present invention encompasses not only the following claims, but also equivalents thereto.

100: Power device
110: Shunt resistance
120: Fault determination unit
170: Microcontroller unit

Claims (15)

A microcontroller unit; Driving IC; And a motor controller including a power device module,
The driving IC includes:
A driving unit for receiving the driving control signal from the microcontroller unit and controlling the power device module;
An HS fault detection unit for detecting an abnormality of a drain-source voltage of an HS (High Side) drive switch of the power device module; An LS failure detection unit for detecting an abnormality of a drain-source voltage of a LS (Low Side) drive switch of the power device module; A feedback failure detector for detecting a voltage abnormality of the shunt resistor connected in series between the power device module and the ground; And a failure determination unit for determining whether or not a voltage abnormality of the HS fault detection unit, the LS fault detection unit, and the feedback failure detection unit is maintained for a reference time or more,
Motor drive IC fault diagnosis device.
The method according to claim 1,
Wherein the connection diagnosis unit is configured to diagnose an abnormality in a connection state between the motor and the driving IC before the motor driving starts or when the motor driving is stopped,
Motor drive IC fault diagnosis device.
The method according to claim 1,
Wherein the feedback failure detecting section detects an abnormality by comparing the voltage applied to the shunt resistor with the first reference voltage during driving of the motor,
Motor drive IC fault diagnosis device.
The method according to claim 1,
Wherein the HS fault detection unit detects an abnormality by comparing a drain-source voltage of the HS drive switch and a second reference voltage during driving of the motor,
Wherein the LS failure detection unit compares a drain-source voltage of the LS drive switch and a third reference voltage during driving of the motor to detect an abnormality,
Motor drive IC fault diagnosis device.
The method according to claim 1,
Wherein the failure determination unit includes a timing filter to determine whether or not a voltage abnormality of the HS fault detection unit, the LS fault detection unit, and the feedback failure detection unit continues for a reference time or longer,
Motor drive IC fault diagnosis device.
The method according to claim 1,
Wherein the failure determination unit includes a first register, a logic operation unit, a timing filter, and a second register,
A voltage abnormality signal of the HS fault detection unit is input to the first register,
Wherein the logic operation unit performs logic operation on a signal stored in the first register, a reference clock, and a gate control signal of the HS drive switch, and outputs the result to the timing filter,
Wherein the timing filter counts the logically calculated signal and applies a fault signal to the second register when the counted number reaches a reference number of times,
Motor drive IC fault diagnosis device.
The method according to claim 6,
Wherein the logic operation unit is configured to perform an AND operation,
Motor drive IC fault diagnosis device.
The method according to claim 6,
Wherein the first register and the second register are D flip-
Motor drive IC fault diagnosis device.
9. The method of claim 8,
Wherein the output (Q) of the first register is input to the logic operation unit, the inverted phase output (/ Q) of the first register is input to the timing filter,
Wherein the timing filter is initialized by the inverted phase output (/ Q)
Motor drive IC fault diagnosis device.
A microcontroller unit; Driving IC; And a motor controller including a power device module,
Receiving a drive control signal of the microcontroller unit by the drive IC to drive the power device module;
Determining a current abnormality of the HS driving switch by measuring a drain-source voltage of a HS (High Side) driving switch of the power device module;
Measuring a voltage across a shunt resistor connected in series with the power device module to determine a feedback current error;
Determining whether the current error of the HS drive switch or the feedback current is longer than a reference time; And
And stopping the driving of the motor and diagnosing whether or not the motor is faulty if the motor exceeds the reference time.
Motor drive IC fault diagnosis method.
11. The method of claim 10,
Further comprising determining whether the connection state between the motor and the driving IC is normal before the driving step.
Motor drive IC fault diagnosis method.
11. The method of claim 10,
Wherein the step of determining the feedback current abnormality includes comparing the first reference voltage with a voltage across the shunt resistor during driving of the motor to detect an abnormality.
Motor drive IC fault diagnosis method.
11. The method of claim 10,
Wherein the step of detecting the failure of the HS drive switch includes comparing the second reference voltage with the drain-source voltage of the HS drive switch during driving of the motor to detect an abnormality.
Motor drive IC fault diagnosis method.
11. The method of claim 10,
Wherein the step of determining whether the current abnormality of the HS driving switch or the feedback current abnormality continues for more than a reference time,
Logic operation of a current abnormality signal or feedback current abnormality signal of the HS drive switch, a reference clock, and a gate control signal of the HS drive switch;
And counting the logical output to generate a failure signal when the counted number reaches the reference number of times.
Motor drive IC fault diagnosis method.
15. The method of claim 14,
Wherein the logic operation and outputting comprises performing an AND operation.
Motor drive IC fault diagnosis method.

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