KR102348623B1 - Motor drive circuit with fail safe function and operation method thereof - Google Patents

Abstract

A motor driving circuit having a fail-safe function according to a preferred embodiment of the present invention includes a first full-bridge circuit for supplying a battery voltage to a motor by operating according to a motor control signal, and when a short-circuit failure of the motor occurs, failure control and a second full-bridge circuit that operates according to a signal to apply an amplified battery voltage to the motor or to supply an inverted battery voltage to the motor.

Description

A motor driving circuit having a fail-safe function and an operating method thereof

The present invention relates to a motor driving circuit and, for example, to a motor driving circuit having a fail-safe function and a fail-safe method thereof.

In general, a motor is used as a driving source of various devices. In particular, a DC motor is used to provide a driving force required for various actuators (eg, an engine) of a vehicle.

DC motors applied to various actuators of vehicles must find and operate optimal operating conditions according to the current state of the vehicle.

A DC motor may have a situation where it cannot be controlled due to a short circuit with an external wire.

Recently, in the case where the control of the DC motor is impossible, an actuator having a self-safety function that moves to a safe position by itself has been developed and commercialized.

However, actuators such as coolant circulation valves that do not have such a safety function cannot circulate coolant in a situation where the control of the DC motor is impossible in the event of a battery or ground short-circuit failure, resulting in larger failures such as engine overheating. are doing

As such, a safety plan for an actuator that does not have its own safety function is required.

Republic of Korea Patent Registration No. 10-1909068

Accordingly, the present invention has been devised in view of the above circumstances, and it is to provide a motor driving circuit having a fail-safe function capable of controlling the motor by controlling the direction of current flowing through the motor when a short-circuit failure occurs, and a fail-safe method thereof. do.

A motor driving circuit having a fail-safe function according to a preferred embodiment of the present invention for achieving the above object includes: a first full-bridge circuit that operates according to a motor control signal to supply a battery voltage to the motor; and a second full-bridge circuit for applying an amplified battery voltage to the motor or supplying an inverted battery voltage to the motor by operating according to a failure control signal when a short circuit failure of the motor occurs.

an amplifier circuit connected to the upper end of the second full-bridge circuit and amplifying and transmitting the battery voltage; and an inversion circuit connected to the lower end of the second full-bridge circuit and inverting and transferring the battery voltage.

The second full-bridge circuit may include: a first switch connected between an output terminal of the amplifier circuit and a positive terminal of the motor; a second switch connected between the output terminal of the amplifier circuit and the minus terminal of the motor; a third switch connected between the output terminal of the inversion circuit and the positive terminal of the motor; and a fourth switch connected between the output terminal of the inversion circuit and the minus terminal of the motor.

The first switch may be turned on according to the second control signal to supply the amplified battery voltage to the motor when a battery short-circuit failure occurs at the negative terminal of the motor.

The second switch may be turned on according to the second control signal to supply the amplified battery voltage to the motor when a battery short-circuit failure occurs at the positive terminal of the motor.

When a ground short fault occurs in the negative terminal of the motor, the third switch may be turned on according to the second control signal to induce a current of the motor with an inverted battery voltage.

When a ground short fault occurs in the positive terminal of the motor, the fourth switch may be turned on according to the second control signal to induce a current of the motor with an inverted battery voltage.

A motor driving circuit having a fail-safe function according to another embodiment of the present invention for achieving the above object includes: a full-bridge circuit that operates according to a motor control signal to supply a battery voltage to the motor; an amplifier circuit connected to the upper end of the full-bridge circuit and amplifying and transmitting the battery voltage; and an inversion circuit connected to the lower end of the full-bridge circuit and inverting and transferring the battery voltage.

a first driving switch connected between an output terminal of the amplifying circuit and a positive terminal of the motor; a second driving switch connected between the output terminal of the amplifying circuit and the minus terminal of the motor; a third driving switch connected between the output terminal of the inversion circuit and the positive terminal of the motor; and a fourth driving switch connected between the output terminal of the inversion circuit and the minus terminal of the motor.

When a battery short-circuit failure occurs at the negative terminal of the motor, the first switch may be turned on according to a failure control signal to supply the amplified battery voltage to the motor.

The second switch may supply the amplified battery voltage to the motor by turning on according to a failure control signal when a battery short-circuit failure occurs at the positive terminal of the motor.

When a ground short fault occurs at the minus terminal of the motor, the third switch may be turned on according to a fault control signal to induce a current of the motor with an inverted battery voltage.

When a ground short fault occurs in the positive terminal of the motor, the fourth switch may be turned on according to a fault control signal to induce a current of the motor with an inverted battery voltage.

In accordance with a preferred embodiment of the present invention for achieving the above object, there is provided a method of operating a motor driving circuit having a fail-safe function, comprising: a short-circuit condition determination step of determining a short-circuit failure condition of a motor; A voltage control step of outputting an amplified voltage or an inverted voltage for each short-circuit failure situation; a switch control step of applying the amplified voltage or the inverted voltage to the motor by performing a switching operation of a full-bridge circuit connected to the motor for each short-circuit failure situation; and a motor driving step in which the motor rotates by the amplified voltage or the inverted voltage.

The short-circuit failure situation may include a battery short-circuit failure of a positive terminal of the motor, a ground short-circuit failure of a positive terminal of the motor, a battery short-circuit failure of a negative terminal of the motor, and a ground short-circuit failure of the negative terminal of the motor. have.

The voltage control step may include a voltage amplification step of amplifying a battery voltage and applying the amplified voltage to the full-bridge circuit in case of a battery short circuit failure situation.

The voltage control step may include a voltage inversion step of inverting a battery voltage and applying the inverted voltage to the full-bridge circuit in case of a ground short fault condition.

According to a motor driving circuit having a fail-safe function and a fail-safe method thereof according to a preferred embodiment of the present invention, it is possible to control the motor by controlling the direction of the current flowing through the motor when a short-circuit failure occurs.

In addition, there is an effect that the actuator can be controlled by changing the operating power when a short circuit failure occurs.

In addition, there is an effect of reducing AS cost and securing driver safety by blocking problems that may cause actuator failure due to short circuit failure of the motor.

1 is a circuit diagram of a motor driving circuit having a fail-safe function according to a preferred embodiment of the present invention.
FIG. 2 is a first diagram illustrating a current control direction for each short circuit failure situation of FIG. 1 .
3 is a second diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .
FIG. 4 is a third diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .
FIG. 5 is a fourth diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .
6 is a circuit diagram of a motor driving circuit having a fail-safe function according to another embodiment of the present invention.
7 is a first diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .
8 is a second diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .
9 is a third diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .
FIG. 10 is a fourth diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .
11 is a flowchart of a fail-safe method of a motor driving circuit according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto or may be variously implemented by those skilled in the art without being limited thereto.

1 is a circuit diagram of a motor driving circuit having a fail-safe function according to a preferred embodiment of the present invention.

1, the motor driving circuit 100 having a fail-safe function according to a preferred embodiment of the present invention is capable of controlling the motor M in a fail-safe manner when a short circuit condition of the motor M occurs, A first full-bridge circuit 110 , a second full-bridge circuit 120 , an amplifier circuit 130 , and an inversion circuit 140 .

The first full-bridge circuit 110 includes a first driving switch T5 and a second driving switch T6 connected to the battery power source UBR, and a third driving switch T7 connected to the ground terminal. and a fourth driving switch T8.

The first driving switch T5 and the third driving switch T7 are connected to the positive terminal (+) of the motor M, and the second driving switch T6 and the fourth driving switch T8 are connected to the motor M It is connected to the minus terminal (-) of

In an embodiment, the first driving switch T5 , the second driving switch T6 , the third driving switch T7 , and the fourth driving switch T8 may be a MOSFET device.

The first full-bridge circuit 110 having the above configuration may drive the motor M by applying a voltage of the battery power UBR by performing a switching operation according to a motor control signal of a controller (not shown) in normal times. .

In addition, the first full-bridge circuit 110 may drive the motor M by controlling the direction of the current flowing in the motor M by performing a switching operation according to the failure control signal of the controller when a short circuit failure of the motor M occurs. have.

The second full-bridge circuit 120 includes a first switch T1 and a second switch T2 connected to the output terminal V1 of the amplifier circuit 130, and the output terminal V2 of the inverting circuit 140 ) and a third switch (T3) and a fourth switch (T4) connected to.

The first switch T1 and the third switch T3 may be connected to the first driving switch T5 , the third driving switch T7 , and the positive terminal (+) of the motor M, respectively.

The second switch T2 and the fourth switch T4 may be connected to each of the second driving switch T6 , the fourth driving switch T8 , and the minus terminal (-) of the motor M.

In one embodiment, the first switch T1 , the second switch T3 , the third switch T3 , and the fourth switch T4 may be a MOSFET device.

The second full-bridge circuit 120 having the above configuration performs a switching operation according to a failure control signal of a control unit (not shown) when a short-circuit failure of the motor M occurs to control the direction of the current flowing in the motor M. (M) can be driven.

The amplification circuit 130 may include an input terminal connected to the battery power source UBR and an output terminal V1 through which the amplified voltage of the battery power source UBR is output. The amplifying circuit 130 may be configured to amplify the voltage of the battery power UBR. The amplification circuit 130 may have an output terminal V1 connected to an upper terminal of the second full-bridge circuit 120 . The amplification circuit 130 may be selectively applied from among various known voltage amplification configurations, and detailed configuration description thereof will be omitted.

The inversion circuit 140 may include an input terminal connected to the battery power source UBR and an output terminal V2 through which the inverted voltage of the battery power source UBR is output. The inversion circuit 140 may be configured to invert the voltage of the battery power UBR. The inverting circuit 140 may have an output terminal V2 connected to a lower terminal of the second full-bridge circuit 120 . The inversion circuit 140 may be selectively applied from among various known voltage inversion configurations, and detailed configuration descriptions thereof will be omitted.

FIG. 2 is a first diagram illustrating a current control direction for each short circuit failure situation of FIG. 1 .

Referring to FIG. 2 , it can be confirmed that a battery short-circuit failure has occurred in the positive terminal (+) of the motor (M). In this case, the controller (not shown) may detect a battery short-circuit failure through a separate sensing device (not shown).

The control unit, if it is determined that the driving of the motor M is continuously necessary in a state where a battery short-circuit failure occurs in the positive terminal (+) of the motor M, the first full-bridge circuit 110 and the second full-bridge A failure control signal for controlling the operation of the circuit 120 may be generated.

The second switch T2 of the second full-bridge circuit 120 may be turned on when a failure control signal is applied.

The amplification circuit 130 may be operated by the controller to amplify the battery voltage by approximately two times.

The amplified battery voltage is applied to the motor M through the second switch T2 to enable reverse rotation of the motor M.

Meanwhile, the fourth driving switch T8 of the first full-bridge circuit 110 may be turned on when a failure control signal is applied.

A battery voltage shorted to the positive terminal (+) of the motor M is applied to the motor M to enable forward rotation of the motor M.

3 is a second diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .

Referring to FIG. 3 , it can be confirmed that a ground short-circuit failure has occurred in the positive terminal (+) of the motor M. As shown in FIG. In this case, the control unit may detect a ground short-circuit failure through a separate sensing device.

The control unit, if it is determined that the driving of the motor (M) is continuously necessary in a state in which a ground short fault occurs in the positive terminal (+) of the motor (M), the first full-bridge circuit 110 and the second full-bridge A failure control signal for controlling the operation of the circuit 120 may be generated.

The fourth switch T4 of the second full-bridge circuit 120 may be turned on when a failure control signal is applied.

The inversion circuit 140 may be operated by the controller to invert and output the battery voltage.

A current flow appears from the motor M to the fourth switch T4 by the ground short voltage and the inverted battery voltage, thereby enabling the forward rotation of the motor M.

Meanwhile, the second driving switch T6 of the first full-bridge circuit 110 may be turned on when a failure control signal is applied.

The battery voltage is applied to the motor M through the second driving switch T6 to enable reverse rotation of the motor M.

FIG. 4 is a third diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .

Referring to FIG. 4 , it can be confirmed that a battery short-circuit failure has occurred at the minus terminal (-) of the motor M. In this case, the controller may detect a battery short-circuit failure through a separate sensing device.

When the control unit determines that it is necessary to continue driving the motor M in a state where a battery short-circuit failure occurs in the negative terminal (-) of the motor M, the first full-bridge circuit 110 and the second full-bridge A failure control signal for controlling the operation of the circuit 120 may be generated.

The first switch T1 of the second full-bridge circuit 120 may be turned on when a failure control signal is applied.

The amplifying circuit 130 may be operated by the controller to amplify the battery voltage by approximately 2 times and output it.

The amplified battery voltage is applied to the motor M through the first switch T1 to enable forward rotation of the motor M.

Meanwhile, the third driving switch T7 of the first full-bridge circuit 110 may be turned on when a failure control signal is applied. At this time, the battery voltage shorted to the minus terminal (-) of the motor M is applied to the motor M to enable the reverse rotation of the motor M.

FIG. 5 is a fourth diagram illustrating a current control direction for each short-circuit failure situation of FIG. 1 .

Referring to FIG. 5 , it can be confirmed that a ground short-circuit failure occurs at the minus terminal (-) of the motor M. As shown in FIG. In this case, the control unit may detect a ground short-circuit failure through a separate sensing device.

The control unit, if it is determined that the driving of the motor (M) is continuously necessary in a state in which a ground short fault occurs in the minus terminal (-) of the motor (M), the first full-bridge circuit 110 and the second full-bridge A failure control signal for controlling the operation of the circuit 120 may be generated.

The third switch T3 of the second full-bridge circuit 120 may be turned on when a failure control signal is applied.

The inversion circuit 140 may be operated by the controller to invert and output the battery voltage.

A current flow appears from the motor M to the third switch T3 by the ground short voltage and the inverted battery voltage, thereby enabling the reverse rotation of the motor M.

Meanwhile, the first driving switch T5 of the first full-bridge circuit 110 may be turned on when a failure control signal is applied. At this time, the battery voltage is applied to the motor M through the first driving switch T5 to enable forward rotation of the motor M.

Table 1 below shows state changes of the first full-bridge circuit 110 and the second full-bridge circuit 120 for motor direction control for each failure type.

Failure type/
motor direction positive end (+) of motor (M) The minus end of the motor (M) (-) battery short circuit short to ground battery short circuit short to ground forward T8(ON) T4(ON) T1(ON) T5(ON) reverse T2(ON) T6(ON) T7(ON) T3(ON)

As described above, in the motor driving circuit 100 having a fail-safe function according to a preferred embodiment of the present invention, even if a battery short-circuit or a ground short-circuit failure occurs while the motor M is driven, the motor ( The operation of M) can be continuously maintained, and the actuator (not shown) stops due to the unexpected stop of the operation of the motor M, thereby preventing a large loss to the vehicle from occurring in advance.

6 is a circuit diagram of a motor driving circuit having a fail-safe function according to another embodiment of the present invention.

Referring to FIG. 6 , in the motor driving circuit 200 having a fail-safe function according to another embodiment of the present invention, the second full-bridge circuit 120 configuration of the motor driving circuit 100 of FIG. 1 is excluded. As being done, the full-bridge circuit 210 , the amplifier circuit 220 , and the inversion circuit 230 are included.

The full-bridge circuit 210 includes a first driving switch FET1 and a second driving switch FET2 connected to the output terminal V1 of the amplifying circuit 220, and connected to the output terminal V2 of the inverting circuit and a third driving switch FET3 and a fourth driving switch FET4 that become

The first driving switch FET1 and the third driving switch FET3 are connected to the positive terminal (+) of the motor M, and the second driving switch FET2 and the fourth driving switch FET4 are connected to the motor M It is connected to the minus terminal (-) of

In an embodiment, the first driving switch FET1 , the second driving switch FET2 , the third driving switch FET3 , and the fourth driving switch FET4 may be a MOSFET device.

The full-bridge circuit 210 having the above configuration may drive the motor M by applying a voltage of the battery power by performing a switching operation according to a motor control signal of the controller MCU during normal times.

The full-bridge circuit 210 may drive the motor M by controlling the direction of the current flowing in the motor M by performing a switching operation according to the failure control signal of the control unit MCU when a short circuit failure of the motor M occurs. .

The amplification circuit 220 may include an input terminal connected to the battery power source UBR and an output terminal V1 through which the amplified voltage of the battery power source UBR is output. The amplification circuit 220 may be configured to amplify the voltage of the battery power UBR by operating by the controller MCU. The amplification circuit 220 may have an output terminal V1 connected to an upper end of the full-bridge circuit 210 . The amplification circuit 220 may be selectively applied from among various known voltage amplification configurations, and detailed configuration descriptions thereof will be omitted.

The inversion circuit 230 may include an input terminal connected to the battery power source UBR and an output terminal V2 through which the inverted voltage of the battery power source UBR is output. The inversion circuit 230 may be configured to operate by the controller MCU to invert the voltage of the battery power UBR. The inverting circuit 230 may have an output terminal V2 connected to a lower terminal of the full-bridge circuit 210 . The inverting circuit 230 may be selectively applied from among various known voltage inversion configurations, and detailed configuration description thereof will be omitted.

7 is a first diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .

Referring to FIG. 7 , it can be confirmed that a battery short-circuit failure has occurred in the positive terminal (+) of the motor M. In this case, the control unit (MCU) may detect a battery short-circuit failure through a separate sensing device.

When the control unit determines that driving of the motor M is continuously required in a state where a battery short-circuit failure occurs in the positive terminal (+) of the motor M, a failure control signal for controlling the operation of the full-bridge circuit 210 can create

The second driving switch FET2 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

The amplification circuit 220 may be operated by the control unit to amplify the battery voltage approximately twice and output it.

The amplified battery voltage is applied to the motor M through the second driving switch FET2 to enable reverse rotation of the motor M.

Meanwhile, the fourth driving switch FET4 of the full-bridge circuit 210 may be turned on when a failure control signal is applied. At this time, the battery voltage shorted to the positive terminal (+) of the motor (M) is applied to the motor (M) to enable the forward rotation of the motor (M).

8 is a second diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .

Referring to FIG. 8 , it can be confirmed that a ground short-circuit failure has occurred in the positive terminal (+) of the motor M. As shown in FIG. In this case, the control unit (MCU) may detect a ground short-circuit failure through a separate sensing device.

When the control unit determines that driving of the motor M is continuously required in a state where a ground short fault occurs in the positive terminal (+) of the motor M, a fault control signal for controlling the operation of the full-bridge circuit 210 can create

The second driving switch FET2 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

The battery voltage is applied to the motor M through the second driving switch FET2 to enable reverse rotation of the motor M.

Meanwhile, the fourth driving switch FET4 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

The inversion circuit 230 may be operated by the controller to invert and output the battery voltage.

A current flow appears from the motor M to the fourth driving switch FET4 by the ground voltage shorted to the positive terminal (+) of the motor M and the inverted battery voltage, so that the forward rotation of the motor M is possible. do.

9 is a third diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .

Referring to FIG. 9 , it can be confirmed that a battery short-circuit failure has occurred in the minus terminal (-) of the motor M. As shown in FIG. In this case, the control unit (MCU) may detect a battery short-circuit failure through a separate sensing device.

When the controller determines that it is necessary to continue driving the motor M in a state where a battery short-circuit failure occurs in the minus terminal (-) of the motor M, a failure control signal for controlling the operation of the full-bridge circuit 210 can create

The first driving switch FET1 of the full-bridge circuit 210 may turn on when a failure control signal is applied.

The amplification circuit 220 may be operated by the control unit to amplify the battery voltage approximately twice and output it.

The amplified battery voltage is applied to the motor M through the first driving switch FET1 to enable forward rotation of the motor M.

Meanwhile, the third driving switch FET3 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

A battery voltage shorted to the minus terminal (-) of the motor M is applied to the motor M to enable the reverse rotation of the motor M.

A current flow appears from the motor M to the fourth driving switch FET4 by the inverted battery voltage, thereby enabling the forward rotation of the motor M.

FIG. 10 is a fourth diagram illustrating a current control direction for each short-circuit failure situation of FIG. 6 .

Referring to FIG. 10 , it can be confirmed that a ground short-circuit failure has occurred in the minus terminal (-) of the motor M. As shown in FIG. In this case, the control unit (MCU) may detect a battery short-circuit failure through a separate sensing device.

When the control unit determines that driving of the motor M is continuously required in a state where a ground short fault occurs in the minus terminal (-) of the motor M, a fault control signal for controlling the operation of the full-bridge circuit 210 can create

The first driving switch FET1 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

The battery voltage is applied to the motor M through the first driving switch FET1 to enable forward rotation of the motor M.

Meanwhile, the third driving switch FET3 of the full-bridge circuit 210 may be turned on when a failure control signal is applied.

The inversion circuit 230 may be operated by the controller to invert and output the battery voltage.

A current flow appears from the motor M to the third drive switch FET3 by the ground short-circuit voltage shorted to the minus terminal (-) of the motor M and the inverted battery voltage, allowing the motor M to rotate in the reverse direction. make it

Table 2 below shows the state changes of the full-bridge circuit 210 , the amplifier circuit 220 , and the inversion circuit 230 for controlling the motor direction for each failure type.

Failure type/
motor direction positive end (+) of motor (M) The minus end of the motor (M) (-) battery short circuit short to ground battery short circuit short to ground forward FET4 (ON), V2 (ground voltage) FET4 (ON), V2 (inverted voltage) FET1(ON), V1(amplification voltage) FET1 (ON), V1 (battery voltage) reverse FET2(ON),
V1 (amplified voltage) FET2(ON),
V1 (battery voltage) FET3(ON),
V2 (ground voltage) FET3(ON),
V2 (reverse voltage)

As described above, in the motor driving circuit 200 having a fail-safe function according to another embodiment of the present invention, even if a battery short-circuit or a ground short-circuit failure occurs while the motor M is driven, the motor ( The operation of M) can be continuously maintained, and the actuator (not shown) stops due to an unexpected operation stop of the motor M, thereby preventing a large loss to the vehicle from occurring in advance.

11 is a flowchart of a fail-safe method of a motor driving circuit according to a preferred embodiment of the present invention.

1 and 11 , the fail-safe method of a motor driving circuit according to a preferred embodiment of the present invention includes a short-circuit fault detection step (S1110), a short-circuit condition determination step (S1120), a switch control step (S1130), and It may include a motor driving step (S1140).

In the short-circuit failure detection step (S1110), the controller (not shown) detects a short-circuit failure of the motor M through a sensing device.

In the short-circuit condition determination step (S1120), the controller determines the detected short-circuit failure condition. The control unit, through a pre-prepared algorithm, a short circuit failure of the battery of the positive terminal (+) of the motor (M), a short circuit failure of the positive terminal (+) of the motor (M), and a short circuit of the battery of the negative terminal (-) of the motor (M). A fault and a ground short fault of the minus terminal (-) of the motor M may be determined.

In the voltage control step (S1130), the controller controls the operation of the amplifier circuit 130 or the inversion circuit 140 for each short-circuit failure situation. The amplification circuit 130 may amplify the battery voltage and output an amplified voltage when a battery short-circuit failure condition occurs. The inversion circuit 140 may output an inversion voltage by inverting the battery voltage when a ground short fault condition occurs.

In the switch control step (S1140), the control unit controls the switching operation of the first full-bridge circuit 110 and the second full-bridge circuit 120 by generating a failure control signal for each short-circuit failure situation.

In the motor driving step S1140 , the motor M performs reverse rotation and forward rotation operation by the switching operation of the first full-bridge circuit 110 and the second full-bridge circuit 120 .

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications, changes and substitutions within the scope without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are for explaining, not limiting, the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments and the accompanying drawings .

Steps and/or operations according to the present invention may occur concurrently in different embodiments, either in a different order, or in parallel, or for different epochs, etc., as would be understood by one of ordinary skill in the art. can

Depending on the embodiment, some or all of the steps and/or operations run instructions, a program, an interactive data structure, a client and/or a server stored in one or more non-transitory computer-readable media. At least some may be implemented or performed using one or more processors. The one or more non-transitory computer-readable media may be illustratively software, firmware, hardware, and/or any combination thereof. Further, the functionality of a “module” discussed herein may be implemented in software, firmware, hardware, and/or any combination thereof.

100: motor drive circuit
110: first full-bridge circuit
120: second full-bridge circuit
130: amplification circuit
140: inversion circuit
200: motor drive circuit
210: full-bridge circuit
220: amplification circuit
230: inversion circuit

Claims (17)

a first full-bridge circuit that operates according to a motor control signal to supply a battery voltage to the motor;
a second full-bridge circuit for applying an amplified battery voltage to the motor or supplying an inverted battery voltage to the motor by operating according to a failure control signal when a short circuit failure of the motor occurs;
an amplifier circuit connected to the upper end of the second full-bridge circuit and amplifying and transmitting the battery voltage; and
an inversion circuit connected to a lower end of the second full-bridge circuit and inverting and transferring the battery voltage;
including,
The second full-bridge circuit,
a first switch connected between an output terminal of the amplifier circuit and a positive terminal of the motor;
a second switch connected between the output terminal of the amplifier circuit and the minus terminal of the motor;
a third switch connected between the output terminal of the inversion circuit and the positive terminal of the motor; and
a fourth switch connected between the output terminal of the inversion circuit and the minus terminal of the motor;
A motor drive circuit with a fail-safe function comprising a. delete delete The method of claim 1,
The first switch is
When a battery short-circuit failure occurs in the negative terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation according to the failure control signal to supply the amplified battery voltage to the motor. The method of claim 1,
The second switch is
When a battery short-circuit failure occurs in the positive terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation according to the failure control signal to supply the amplified battery voltage to the motor. The method of claim 1,
The third switch is
When a ground short fault occurs in the minus terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation is performed according to the fault control signal to induce the current of the motor with an inverted battery voltage. The method of claim 1,
The fourth switch is
When a ground short fault occurs in the positive terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation is performed according to the fault control signal to induce a current of the motor with an inverted battery voltage. a full-bridge circuit that operates according to a motor control signal to supply a battery voltage to the motor;
an amplifier circuit connected to the upper end of the full-bridge circuit and amplifying and transmitting the battery voltage; and
an inversion circuit connected to a lower end of the full-bridge circuit and inverting and transferring the battery voltage;
including,
The full-bridge circuit is
a first driving switch connected between an output terminal of the amplifying circuit and a positive terminal of the motor;
a second driving switch connected between the output terminal of the amplifying circuit and the minus terminal of the motor;
a third driving switch connected between the output terminal of the inversion circuit and the positive terminal of the motor; and
a fourth driving switch connected between the output terminal of the inversion circuit and the minus terminal of the motor;
A motor driving circuit having a fail-safe function comprising a. delete 9. The method of claim 8,
The first switch is
When a battery short-circuit failure occurs in the negative terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation according to the failure control signal to supply the amplified battery voltage to the motor. 9. The method of claim 8,
The second switch is
When a battery short-circuit failure occurs in the positive terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation according to the failure control signal to supply the amplified battery voltage to the motor. 9. The method of claim 8,
The third switch is
Motor driving circuit with a fail-safe function, characterized in that when a ground short fault occurs in the minus terminal of the motor, the motor is turned on according to a fault control signal to induce a current of the motor with an inverted battery voltage. 9. The method of claim 8,
The fourth switch is
When a ground short fault occurs in the positive terminal of the motor, the motor driving circuit having a fail-safe function, characterized in that the turn-on operation is performed according to a fault control signal to induce a current of the motor with an inverted battery voltage. A full-bridge circuit, an amplification circuit connected to the upper end of the full-bridge circuit and amplifying and transmitting a battery voltage, and an inverting circuit connected to a lower end of the full-bridge circuit and inverting and transferring the battery voltage In the fail-safe method of a motor driving circuit,
A short circuit condition determination step of determining a short circuit failure condition of the motor;
a voltage control step of outputting an amplified voltage of the amplifying circuit or an inverted voltage of the inverting circuit for each short-circuit failure situation;
a switch control step of applying the amplified voltage or the inverted voltage to the motor by switching the full-bridge circuit connected to the motor for each short-circuit failure situation; and
a motor driving step of rotating the motor by the amplified voltage or the inverted voltage;
including,
The full-bridge circuit is
A first drive switch connected between the output terminal of the amplification circuit and the positive terminal of the motor, a second drive switch connected between the output terminal of the amplifier circuit and the negative terminal of the motor, the output terminal of the inversion circuit and the positive terminal of the motor A fail-safe method of a motor driving circuit comprising a third driving switch connected between the terminals, and a fourth driving switch connected between the output terminal of the inversion circuit and the minus terminal of the motor. 15. The method of claim 14,
The short circuit failure situation is
Motor driving circuit, characterized in that it includes a short circuit failure of the battery of the positive terminal of the motor, a short circuit failure of the ground of the positive terminal of the motor, a short circuit failure of the battery of the negative terminal of the motor, and a short circuit failure of the ground of the negative terminal of the motor. 's fail-safe method. 16. The method of claim 15,
The voltage control step is
In case of a battery short-circuit failure situation, the fail-safe method of a motor driving circuit comprising the step of amplifying, by the amplifying circuit, the battery voltage and applying the amplified voltage to the full-bridge circuit. 16. The method of claim 15,
The voltage control step is
In the case of a ground short fault condition, the fail-safe method of a motor driving circuit comprising: the inverting circuit inverting the battery voltage and applying the inverted voltage to the full-bridge circuit.

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