KR20100055632A - Current sensing circuit of engine control unit - Google Patents

Current sensing circuit of engine control unit Download PDF

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Publication number
KR20100055632A
KR20100055632A KR1020080114446A KR20080114446A KR20100055632A KR 20100055632 A KR20100055632 A KR 20100055632A KR 1020080114446 A KR1020080114446 A KR 1020080114446A KR 20080114446 A KR20080114446 A KR 20080114446A KR 20100055632 A KR20100055632 A KR 20100055632A
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KR
South Korea
Prior art keywords
sensing circuit
current sensing
voltage
comparator
control unit
Prior art date
Application number
KR1020080114446A
Other languages
Korean (ko)
Inventor
한영섭
Original Assignee
현대모비스 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020080114446A priority Critical patent/KR20100055632A/en
Publication of KR20100055632A publication Critical patent/KR20100055632A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE: A current sensing circuit of an engine control unit is provided to prevent the damage of a switching element by turning off the switching element when detecting an overvoltage. CONSTITUTION: In a current sensing circuit of an engine control unit, a voltage is measured through shunt resistance(12). An operational amplifier(11) amplifies the measured voltage. A comparator compares the amplified voltage with a reference voltage. A NAND gate(13) receives an output signal of a comparator with an output signal of MCU. The NAND gate turns on/off the switching elements.

Description

Current sensing circuit of engine control unit

The present invention relates to a current sensing circuit of an engine control unit, and more particularly, to a current sensing circuit of an engine control unit for preventing a delay of a response time during overcurrent detection.

1 shows a current sensing circuit of an engine control unit applied to a conventional vehicle, in which the comparator 10, the OP amplifier 11, the shunt resistor 12, and the like are provided.

In the current sensing circuit, after the minute voltage is measured using the shunt resistor 12, the minute voltage is amplified using the OP amplifier 11.

Subsequently, the comparator 10 compares the amplified voltage with a reference voltage. For example, when a current flows normally, the output of the comparator 10 becomes low.

On the other hand, when an overcurrent exceeding the reference voltage flows, the output of the comparator 10 becomes high, and the output signal of the comparator 10 is input to the MCU to detect the overcurrent. In the MCU, the FET gate, which is a switching element, is turned off in software.

However, in the current sensing circuit of the conventional engine control unit as described above, when overcurrent is detected, the time to be processed by the MCU is delayed, and also due to the time delay occurring at the output terminal of the comparator, the FET gate Since the response time for turning off the gate becomes long, there is a problem in performing a burnout and fail safe function of the switching element.

The present invention provides a current sensing circuit of an engine control unit for additionally providing a NAND gate to a current sensing circuit of an engine control unit to immediately turn off the switching element when an overcurrent is detected, thereby preventing the switching element from being burned out. It is to provide.

The current sensing circuit of the engine control unit according to the present invention includes a shunt resistor for measuring a voltage; An operational amplifier for amplifying the measured voltage; A comparator for comparing the amplified voltage with a reference voltage; And a NAND gate configured to receive an output signal of the comparator and an output signal of the MCU and to turn on / off a switching element.

The comparator compares the amplified voltage with a reference voltage, and outputs a low signal when a current flows normally, and outputs a high signal when an overcurrent flows.

In addition, a pull down resistor may be provided at an input terminal of the NAND gate.

According to the present invention, since the response time is about 1000 times faster than when the conventional current sensing circuit is applied, the switching element is turned off immediately when the overcurrent is detected, thereby effectively preventing the switching element from being burned out due to the overcurrent. .

Hereinafter, a preferred embodiment of the current sensing circuit of the engine control unit according to the present invention will be described in detail with reference to the accompanying drawings.

2 shows a current sensing circuit of the engine control unit according to the present invention. For example, the current sensing circuit includes a comparator 10, an OP amplifier 11, a shunt resistor 12, and A NAND gate is provided.

In the current sensing circuit, after the minute voltage is measured using the shunt resistor 12, the minute voltage is amplified using the OP amplifier 11.

In the comparator 10, the amplified voltage is compared with a reference voltage. For example, when a current flows normally, the output of the comparator 10 becomes low.

On the other hand, when an overcurrent exceeding the reference voltage flows, the output of the comparator 10 becomes high, and the output signal of the comparator 10 is one input terminal of the NAND gate 13. Is entered.

The MCU output signal is input to the other input terminal of the NAND gate 13, and as shown in FIG. 2, the comparator (MCU) is output to the input terminal of the NAND gate 13 together with the MCU output signal. By inputting the overcurrent detection signal, which is the output signal of 10), when the overcurrent is detected in hardware, the FET gate is immediately turned off.

Accordingly, it is possible to prevent burnout of the switching element. A pull down resistor is provided at an input terminal of the NAND gate 13 so that an output signal of the comparator 10 becomes high when overcurrent occurs. High).

As a result, the path of the generated current can be formed, thereby increasing the response time (eg, 9us) of the current sensing circuit, thereby preventing FET burnout during overcurrent.

For example, FIG. 3 is a graph showing a response time when the conventional current sensing circuit is applied, and FIG. 4 is a graph showing a response time when the current sensing circuit of the present invention is applied. The response time is about 1000 times faster than the prior art.

For reference, the current sensing circuit of the present invention can be applied to various technical fields other than the engine control unit.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. , Alteration, substitution, addition, or the like.

1 illustrates a current sensing circuit of a conventional engine control unit,

2 is a view showing a current sensing circuit of the engine control unit according to the present invention;

3 is a graph showing a response time when applying a conventional current sensing circuit,

4 is a graph showing the response time when the current sensing circuit of the present invention is applied.

[Description of Drawings]

10: comparator 11: OP amplifier

12: Shunt Resistance 13: NAND Gate

Claims (3)

A shunt resistor for measuring the voltage; An operational amplifier for amplifying the measured voltage; A comparator for comparing the amplified voltage with a reference voltage; And And a NAND gate configured to receive the output signal of the comparator and the output signal of the MCU and to turn on / off a switching element. The method of claim 1, The comparator compares the amplified voltage with a reference voltage, and outputs a low signal when a current flows normally, and outputs a high signal when an overcurrent flows. Sensing circuit. The method of claim 1, And a pull down resistor is provided at an input terminal of the NAND gate.
KR1020080114446A 2008-11-18 2008-11-18 Current sensing circuit of engine control unit KR20100055632A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080114446A KR20100055632A (en) 2008-11-18 2008-11-18 Current sensing circuit of engine control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080114446A KR20100055632A (en) 2008-11-18 2008-11-18 Current sensing circuit of engine control unit

Publications (1)

Publication Number Publication Date
KR20100055632A true KR20100055632A (en) 2010-05-27

Family

ID=42279929

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020080114446A KR20100055632A (en) 2008-11-18 2008-11-18 Current sensing circuit of engine control unit

Country Status (1)

Country Link
KR (1) KR20100055632A (en)

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