KR102324585B1 - Integrated circuit fof power supply and reset controlling method thereof - Google Patents

Abstract

The power supply integrated circuit according to the present invention includes a sensor voltage supply port for providing a power supply voltage to at least one of a plurality of sensors, a current sensing circuit for detecting a current provided to the sensor voltage supply port, and outputting current information, the a current change amount sensing circuit for receiving current information of the current sensing circuit to sense a change amount of the current, and outputting the current change amount information; a clock circuit for outputting time information; and a control logic that determines whether to reset after a key-on by using the current information, the current change amount information, and the time information.

Description

INTEGRATED CIRCUIT FOF POWER SUPPLY AND RESET CONTROLLING METHOD THEREOF

The present invention relates to a power supply integrated circuit and a reset control method thereof.

In general, electrical products generate an inrush current when power is supplied while the power is off. In particular, in the electric sensor, the maximum value of the inrush current generated at the moment power is supplied is often greater than the maximum current consumed. Such inrush current may cause a malfunction that causes an unwanted IC (Integrated Circuit) reset.

Patent Publication: 10-2019-001625, Application Date: June 26, 2017, Title: OBC Control System and Method for Vehicles

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply integrated circuit that prevents the reset of an IC according to a fault condition due to an inrush current of a sensor, and a reset control method thereof.

A power supply integrated circuit according to an embodiment of the present invention includes a sensor voltage supply port for providing a power supply voltage to at least one of a plurality of sensors; a current sensing circuit for sensing a current supplied to the sensor voltage supply port and outputting current information; a current change amount sensing circuit for receiving the current information of the current sensing circuit, sensing the current change amount, and outputting the current change amount information; a clock circuit outputting time information; and a control logic that determines whether to reset after a key-on by using the current information, the current change amount information, and the time information.

In an embodiment, the apparatus may further include a voltage regulator configured to receive a battery voltage from a battery and generate the power supply voltage.

In an embodiment, a first voltage regulator that receives a battery voltage from a battery and outputs a high voltage; a second voltage regulator receiving the high voltage from the first voltage regulator and outputting the power supply voltage; and a third voltage regulator receiving the power supply voltage from the second voltage regulator and outputting the power supply voltage to the sensor voltage supply port.

In an embodiment, the first voltage regulator includes a first comparator that compares a reference voltage and the high voltage, and is turned on in response to an output value of the first comparator by a first transistor that is turned on. 1 It is characterized in that the output terminal of the voltage regulator is connected.

In an embodiment, the second voltage regulator may include: a second comparator comparing a reference voltage and the power supply voltage; and a second transistor connecting an output terminal of the first voltage regulator and an output terminal of the second voltage regulator in response to an output value of the second comparator.

In an embodiment, the third voltage regulator may include: a third comparator comparing the power supply voltage and a voltage of the sensor voltage supply port; and third and fourth transistors connected in series between an output terminal of the second voltage regulator and the sensor voltage supply port in response to an output value of the third comparator.

In an embodiment, the current sensing circuit comprises: a first amplifier for amplifying the voltage across the first resistor inserted into the line related to the sensor voltage supply port; and a second amplifier amplifying the output value of the first amplifier and a division voltage, wherein the division voltage is determined by the second and third resistors connected in series between the pull-up source voltage and the ground terminal.

In an embodiment, the current change amount detection circuit comprises: a first capacitor charged by the output value of the second amplifier; a third amplifier having a negative voltage terminal connected to the voltage of the first capacitor and a positive voltage terminal connected to a ground terminal; a fourth amplifier including a positive voltage terminal connected to the ground terminal, and an output terminal for outputting the current variation information; a fourth resistor connected between the negative voltage terminal of the third amplifier and an output terminal of the third amplifier; a fifth resistor connected between the output terminal of the third amplifier and the negative voltage terminal of the fourth amplifier; and a sixth resistor connected between the negative voltage terminal of the fourth amplifier and the output terminal of the fourth amplifier.

In an embodiment, the control logic stores the number of resets, and determines the sensor failure when the number of resets is equal to or greater than a reference number.

In an embodiment, a resistor for checking whether the voltage value of the sensor voltage supply port is appropriate, a resistor for checking whether it is appropriate by detecting a change amount of current, a resistor for checking an elapsed time after Key-on, and a key-on state for checking It may further include a register.

A reset control method of a power supply integrated circuit according to an embodiment of the present invention comprises: recognizing a key on signal; generating a controller internal supply voltage or a controller external sensor supply voltage in response to the Key on signal; determining whether the sensor supply voltage is normal; if the sensor supply voltage is not normal, determining whether an elapsed time since the key on signal is received is longer than a reference time; and resetting the power supply integrated circuit when the elapsed time after receiving the key-on signal is longer than the reference time.

In an embodiment, when the sensor supply voltage is normal, the method may further include operating the power supply integrated circuit normally.

In an embodiment, if the elapsed time after receiving the Key on signal is not longer than the reference time, the method may further include determining whether the amount of current consumed by the line providing the sensor supply voltage is greater than a reference value.

In an embodiment, when the amount of current consumption is greater than the reference value, the method may further include operating the power supply integrated circuit normally.

In an embodiment, if the amount of current consumption is not greater than the reference value, the method may further include resetting the power supply integrated circuit.

In an embodiment, storing the number of resets in a register; and determining whether the number of resets is greater than a reference number.

In an embodiment, when the number of resets is greater than the reference number of times, the method may further include determining a sensor failure.

In an embodiment, if the number of resets is not greater than the reference number of times, performing Key off; and performing Key on again after the Key off.

In an embodiment, the sensor supply voltage is 5V.

In an embodiment, the sensor supply voltage is characterized in that it receives a battery voltage provided from a battery and is output by at least one voltage regulator.

In the power supply integrated circuit and the reset control method thereof according to an embodiment of the present invention, when an abnormal voltage value is generated in the sensor power supply port due to the inrush current generated when the sensors are powered on, the abnormal voltage value is applied to the inrush current. It is possible to determine whether it is a temporary phenomenon caused by the

A power supply integrated circuit and a reset control method thereof according to an embodiment of the present invention, differently from a power supply integrated circuit of a general vehicle controller, a current sensing circuit for monitoring a supply current of a sensor and an output value of the current sensing circuit to receive an amount of change in current When an abnormal voltage value is detected at the sensor power output port by having a current change detection circuit that detects You can decide whether to keep it or not.

The power supply integrated circuit and the reset control method thereof according to an embodiment of the present invention can maintain the normal operation of the power supply integrated circuit without resetting the IC due to a temporary phenomenon such as a sensor inrush current.

1 is a diagram exemplarily showing a controller 100 having a power supply integrated circuit 120 according to an embodiment of the present invention.
FIG. 2 is a diagram exemplarily showing the current sensing circuit 124 shown in FIG. 1 .
FIG. 3 is a diagram exemplarily illustrating the current variation detection circuit 125 shown in FIG. 1 .
4 is a flowchart exemplarily showing a reset control method of the power supply integrated circuit 120 according to an 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 if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, preferred embodiments of the present invention will be described below, but the technical spirit of the present invention is not limited thereto and may be variously implemented by those skilled in the art without being limited thereto.

In general, most electronic products generate an inrush current when power is supplied while the power is off. In particular, in the case of an electric sensor, in the operation mode, the maximum value of inrush current generated at the moment power is supplied may be greater than the maximum current consumed. A malfunction may be caused by resetting the integrated circuit (IC) by such inrush current.

In the power supply integrated circuit and the reset control method thereof according to an embodiment of the present invention, when monitoring the state of the power supply port, the sensor inrush current by considering not only the voltage state of the power supply port but also the change amount of the current It is possible to determine whether it is a one-time situation or a continuous situation such as a sensor failure, and decide whether to reset the IC according to the determination result. Accordingly, in the power supply integrated circuit and the reset control method thereof according to an embodiment of the present invention, when the vehicle is changed from the key off state to the key on, the sensors wake up from the sleep state and become a power on state and consume current, It is possible to prevent malfunction of the IC due to the inrush current of some sensors.

1 is a diagram exemplarily showing a controller 100 having a power supply integrated circuit 120 according to an embodiment of the present invention. Referring to FIG. 1 , the controller 100 may be implemented to supply a power supply voltage VDD to a plurality of sensors (sensors 1, 2, 3, 4, and 5). Here, the power supply voltage VDD may be 5V. Meanwhile, it should be understood that the power supply voltage VDD of the present invention is not limited thereto. Meanwhile, although the number of sensors controlled by the controller 100 shown in FIG. 1 is 5, the present invention will not be limited thereto.

The power supply integrated circuit 120 may receive the high voltage from the positive voltage terminal of the battery 200 and provide the power voltage VDD to the plurality of sensors through the power port P. Here, the negative voltage terminal of the battery 200 may be grounded to the chassis.

The power supply integrated circuit 120 includes a first voltage regulator 121, a second voltage regulator 122, a third voltage regulator 123, a current sensing circuit 124, a current change amount sensing circuit 125, a control logic ( 126 ), and a clock circuit 127 .

The first voltage regulator 121 may be implemented to output the high voltage VDDA of the controller 100 . Here, the high voltage VDDA may be 6V. Meanwhile, it should be understood that the high voltage (VDDA) of the present invention is not limited thereto. The first voltage regulator 121 may include a first comparator CMP1 . The first comparator CMP1 may compare the reference voltage REF and the high voltage VDDA. The first transistor T1 may connect the positive voltage terminal of the battery 200 and the output terminal N1 of the first voltage regulator 121 according to the output value of the first comparator CMP1 .

It may be implemented to output the power supply voltage VDD of the second voltage regulator 122 and the controller 100 . The second voltage regulator 122 may include a second comparator CMP2 and a second transistor T2 . The second comparator CMP2 may compare the reference voltage REF and the power supply voltage VDD. The second transistor T2 may connect the output terminal N1 of the first voltage regulator 121 and the output terminal N2 of the second voltage regulator 122 according to the output value of the second comparator CMP2 .

The third voltage regulator 123 may be implemented to output the power supply voltage VDD of the sensors. The third voltage regulator 123 may include a third comparator CMP3 and a third transistor T3 and a fourth transistor T4 . The third comparator CMP3 may compare the power voltage VDD with the voltage of the output port P. The third and fourth transistors T3 and T4 connected in series may connect the output terminal N1 of the first voltage regulator 121 and the output port P according to the output value of the third comparator CMP3 .

The current sensing circuit 124 may be implemented to sense a current of the output terminal N1 of the first voltage regulator 121 and transmit current information to the control logic 126 .

The current change amount sensing circuit 125 may be implemented to sense the current change amount of the current sensing circuit and transmit current change amount information to the control logic 126 .

The control logic 126 may receive time information, current information, and current variation information, and may determine whether to reset the controller 100 or the power supply integrated circuit 120 .

The clock circuit 127 may transmit time information to the control logic 126 .

Although not shown, circuits for performing a function of a general vehicle power supply IC may be further included. In addition, a SW (software) element for displaying and recognizing these states may be further included.

A general power supply integrated circuit monitors the voltage value of the sensor voltage supply port, and resets the IC when the voltage value deviates from the IC (Integrated Circuit) setting reference value. In this prior art, a malfunction is caused by resetting the power supply IC by an inrush current that occurs at the moment power is supplied.

On the other hand, in the power supply integrated circuit 120 according to the embodiment of the present invention, in addition to the voltage value of the sensor voltage supply port P, the amount of change in current and the time after power on are taken into consideration as well as the reset of the power supply integrated circuit 120 . You can control the action. Specifically, the power supply integrated circuit 120 according to the embodiment of the present invention monitors the amount and rate of change of the current supplied from the integrated circuit to the sensor as well as the sensor supply voltage to prevent a malfunction, and the key on state The operation of the power supply integrated circuit 120 may be activated or deactivated in consideration of the time from .

FIG. 2 is a diagram exemplarily showing the current sensing circuit 124 shown in FIG. 1 . 2, the current sensing circuit 124 puts the resistance component R1 in the current supply line of the sensors, and detects the amount of current by adding an amplifier (OP AMP, A1), and the resistors R2 and R3. It may be implemented to check whether the current value sensed through the and comparator A2 is within a normal range. Here, V1 is the pull-up source voltage, and V2 is the output voltage of the comparator A2.

The first amplifier A1 may be implemented to amplify the voltage across the resistor R1 of the sensor supply current line PWL.

The second amplifier A2 may include a first input terminal (+) for receiving the output value of the first amplifier A1, and a second input terminal (-) for receiving a voltage obtained by dividing the pull-up source voltage V1 by resistance. . Here, the resistance distribution may be made by resistors R2 and R3 connected in series between the pull-up source voltage V1 and the ground terminal GND. The second amplifier A2 may output the output voltage V2 by comparing the output value of the first amplifier A of the first input terminal (+) with the resistor division voltage.

The sensor supply current line PWL is a line that supplies current from the power supply IC 120 to each sensor. When the resistor R1 is inserted into the sensor supply current line PWL, the value obtained by multiplying the sensor supply current * R1 value by the Gain of the first amplifier A1 may be the + terminal input of the second amplifier A2. A value of V1*(R3/(R2+R3)) may be input to the - terminal of the second amplifier A1. A value obtained by multiplying the '+' and '-' terminal input differential values of the second amplifier A2 by the gain value of the second amplifier A2 may be output as the final output value V2 of the current sensing circuit 124 . The final output value V2 of the second amplifier A2 may be transmitted to the control logic 126 as sensing current information.

Meanwhile, the control logic 126 may determine the sensor supply current by inversely calculating the sensed current information.

Meanwhile, the final output value V2 of the current sensing circuit 124 may be input to the current variation sensing circuit 125 .

FIG. 3 is a diagram exemplarily illustrating the current variation detection circuit 125 shown in FIG. 1 . Referring to FIG. 3, the current change amount detection circuit 125 checks the change amount of the supply current through the capacitor C1, the resistor R4, and the third amplifier (OP AMP, A3) in the first stage, In the second stage, through the resistors (R5, R6) and the fourth amplifier (OP AMP, A4), the change value of the current inverted in the first stage can be inverted again.

As shown in FIG. 3 , an output value V2 of the current sensing circuit 124 may be an input value of the current variation sensing circuit 125 . This input value V2 may be output to the control logic 126 as a final output value V4 through the third and fourth amplifiers A3 and A4 .

C1*(dV2/dt)=-V3/R4 in the third amplifier A3, and V3/R5=-V4/R6 in the fourth amplifier A4. If we solve the two equations simultaneously, we get dV2/dt=R6/(C1*R4*R5*V4). Accordingly, the control logic 126 may monitor the amount of change of the output value V2 according to time, that is, the amount of change of the sensor supply current.

The power supply integrated circuit 120 according to an embodiment of the present invention can control its own operation through a SW register. In particular, a resistor that can check the appropriateness of the voltage value of the sensor power port (P), a resistor that can detect the change in current and check its adequacy, a register that can check the time since Key on, You need a register that you can check.

When the sensor supply voltage value is not within the normal value range due to the inrush current that occurs when the power IC supplying current to the sensor used in the vehicle turns on the sensor, the power supply integrated circuit 120 responds to the inrush current. The IC (or controller) may reset or maintain normal operation by determining whether it is temporary or caused by a continuous factor such as a sensor failure or a wire short circuit.

4 is a flowchart exemplarily illustrating a method of operating the power supply integrated circuit 120 according to an embodiment of the present invention. 1 to 4 , the power supply integrated circuit 120 may operate as follows.

The power supply integrated circuit 120 may receive the key on signal (S110) and supply a necessary voltage (eg, 5V, 3.3V, 1.3V, etc.) to the inside of the controller 100 (S111).

In addition, the power supply integrated circuit 120 may generate and supply a sensor supply power voltage VDD necessary for an external sensor of the controller 100 ( S112 ). In general, a vehicle sensor uses a voltage of 5V.

Thereafter, it may be determined whether the sensor supply voltage VDD is in a normal range ( S113 ). If the sensor supply voltage VDD exists in the normal range, the controller 100 may maintain a normal operation (S114). Thereafter, the operation may be stopped by the driver's key off after the vehicle driving is finished (S115).

On the other hand, if the sensor supply voltage VDD does not exist in the normal range, it may be determined whether the time after key on is longer than the reference time (S116). At this time, if the elapsed time after the key on is longer than the reference time, since there is a possibility of an abnormality due to a continuous cause such as a sensor failure, it can be reset immediately (S118).

On the other hand, if the elapsed time after the key on is not longer than the reference time, it may be determined whether the change amount of the current consumption of the sensor is greater than the reference value (S117). If the change in consumption current is greater than the reference value, it is determined that it is due to a temporary cause due to the inrush current, and the normal operation of the sensor may be maintained ( S114 ).

On the other hand, even if the set time has not elapsed after the key-on time, if the amount of change in the consumption current is smaller than the reference value, it is not caused by the inrush current, and thus the reset may proceed (S118). Thereafter, it may be determined whether the number of resets is greater than the reference number (eg, an integer greater than or equal to 2) (S119).

If the number of resets is greater than the reference number, the failure is confirmed (S120), and step S115 may be entered. For example, when the sensor supply voltage VDD is not in the normal range and reset occurs two or more times in succession due to the described condition, the sensor failure due to a continuous factor such as a sensor failure wire short circuit may be confirmed. And the operation may be terminated by the driver's key off.

On the other hand, if the number of resets is not greater than the reference number of times, when reset occurs in the power supply integrated circuit 120, the engine does not start, so the driver may perform Key on (S122) after performing Key off (S121). . When the power supply integrated circuit 120 according to an embodiment of the present invention is reset, the sequence of the operation mechanism may return to the first part by the driver's key off and key on, and the above-described operations may be repeated.

In the method of operating the power supply integrated circuit 120 according to an embodiment of the present invention, when an abnormal voltage value is detected in the sensor power output port, the time and the change in current consumption from the key on time are taken into consideration as well as the reset of the power IC. It can be decided whether to generate the sensor or to keep the sensor operating normally.

In an embodiment, when monitoring the state of the sensor power supply port, it is determined whether it is a temporary situation due to the sensor inrush current or a continuous situation such as a sensor failure in consideration of the change amount of current as well as the voltage state of the port to reset the IC may be decided. In an embodiment, the power supply state from the sensor power port may be sensed together with the voltage value at the port as well as the current. In an embodiment, the circuit sensing the amount of current may measure the amount of current using a resistor and an amplifier, and compare whether the amount of current flowing using the resistor and the comparator is normal. In an embodiment, the current change amount sensing circuit using a resistor, a capacitor, an amplifier, etc. may receive an amount of current as an input and output the amount of change as an output.

In order to determine whether to reset the power supply IC according to an embodiment of the present invention, a resistor that confirms the appropriateness of the voltage value of the sensor power port, a register that detects the amount of change in the port current and confirms the appropriateness, and the time elapsed from the key on time It may include a register that can check . In an embodiment, the power supply integrated circuit 120 may include control logic capable of executing the above-described operating mechanism.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions are possible within the range that does not depart from the essential characteristics of the present invention by those of ordinary skill in the art to which the present invention pertains. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are intended to explain, not to limit 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. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

100: controller
120: power supply integrated circuit
121, 122, 123: voltage regulator
124: current sensing circuit
125: current change amount detection circuit
126: control logic
127: clock circuit

Claims (17)

A power supply integrated circuit comprising:
a sensor voltage supply port for providing a sensor supply voltage to at least one of the plurality of sensors;
a current sensing circuit for sensing a current supplied to the sensor voltage supply port and outputting current information;
a current change amount sensing circuit for receiving the current information of the current sensing circuit, detecting a current change amount, and outputting the current change amount information;
a clock circuit outputting time information; and
and a control logic for determining whether to reset after Key-on by using the sensor supply voltage, the current change amount information, and the time information,
The control logic determines whether an elapsed time after receiving a key on signal is longer than a reference time when the sensor supply voltage is not normal, and when the elapsed time is not longer than the reference time, the amount of current change is greater than a reference value and the power supply integrated circuit is operated normally and the power supply integrated circuit is reset if the current variation is not greater than the reference value. The method of claim 1,
The power supply integrated circuit further comprising a voltage regulator receiving power from a battery and generating the sensor supply voltage. The method of claim 1,
a first voltage regulator receiving a battery voltage from the battery and outputting a high voltage;
a second voltage regulator receiving the high voltage from the first voltage regulator and outputting the sensor supply voltage; and
and a third voltage regulator receiving the sensor supply voltage from the second voltage regulator and outputting the sensor supply voltage to the sensor voltage supply port. 4. The method of claim 3,
The first voltage regulator is
a first comparator for comparing a reference voltage and the high voltage;
The battery and the output terminal of the first voltage regulator are connected by a first transistor turned on in response to an output value of the first comparator. 4. The method of claim 3,
The second voltage regulator is
a second comparator for comparing a reference voltage and the sensor supply voltage; and
and a second transistor coupled between an output terminal of the first voltage regulator and an output terminal of the second voltage regulator in response to an output value of the second comparator. 4. The method of claim 3,
The third voltage regulator is
a third comparator for comparing the sensor supply voltage with a voltage of the sensor voltage supply port; and
and third and fourth transistors connected in series between an output terminal of the second voltage regulator and the sensor voltage supply port in response to an output value of the third comparator. The method of claim 1,
The current sensing circuit,
a first amplifier for amplifying the voltage across the first resistor inserted into the line related to the sensor voltage supply port; and
a second amplifier for amplifying between the output value of the first amplifier and the divided voltage;
The divided voltage is determined by the second and third resistors connected in series between the pull-up source voltage and the ground terminal. 8. The method of claim 7,
The current change amount detection circuit,
a first capacitor charged by the output value of the second amplifier;
a third amplifier having a negative voltage terminal connected to the voltage of the first capacitor and a positive voltage terminal connected to a ground terminal;
a fourth amplifier including a positive voltage terminal connected to the ground terminal, and an output terminal for outputting the current variation information;
a fourth resistor connected between the negative voltage terminal of the third amplifier and an output terminal of the third amplifier;
a fifth resistor connected between the output terminal of the third amplifier and the negative voltage terminal of the fourth amplifier; and
and a sixth resistor coupled between the negative voltage terminal of the fourth amplifier and the output terminal of the fourth amplifier. The method of claim 1,
and the control logic stores the number of resets, and determines the sensor failure when the number of resets is greater than or equal to the reference number of times. The method of claim 1,
A resistor for confirming whether the voltage value of the sensor voltage supply port is appropriate, a resistor for checking whether it is appropriate by detecting a change amount of current, a register for checking the elapsed time after the key on, and a resistor for checking the key on state power supply integrated circuit. A reset control method for a power supply integrated circuit, comprising:
Recognizing a key on signal;
generating a controller internal supply voltage and a controller external sensor supply voltage in response to the Key on signal;
determining whether the sensor supply voltage is normal;
if the sensor supply voltage is not normal, determining whether an elapsed time since the key on signal is received is longer than a reference time;
resetting the power supply integrated circuit if the elapsed time after receiving the key on signal is longer than the reference time;
if the elapsed time after receiving the key-on signal is not longer than the reference time, determining whether the amount of change in current of the line providing the sensor supply voltage is greater than a reference value; and
and operating the power supply integrated circuit normally if the current change amount is greater than the reference value, and resetting the power supply integrated circuit if the current change amount is not greater than the reference value. 12. The method of claim 11,
When the sensor supply voltage is normal, the reset control method of the power supply integrated circuit further comprising the step of operating the power supply integrated circuit normally. delete delete 12. The method of claim 11,
storing the number of resets in a register; and
and determining whether the number of resets is greater than a reference number. 16. The method of claim 15,
The reset control method of the power supply integrated circuit further comprising the step of determining a sensor failure when the number of resets is greater than the reference number of times. 16. The method of claim 15,
if the number of resets is not greater than the reference number of times, performing a key off; and
The reset control method of the power supply integrated circuit further comprising the step of performing the key on again after the key off.

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