KR101142461B1 - Insulation resistance measurement circuit - Google Patents

Insulation resistance measurement circuit Download PDF

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KR101142461B1
KR101142461B1 KR1020080102441A KR20080102441A KR101142461B1 KR 101142461 B1 KR101142461 B1 KR 101142461B1 KR 1020080102441 A KR1020080102441 A KR 1020080102441A KR 20080102441 A KR20080102441 A KR 20080102441A KR 101142461 B1 KR101142461 B1 KR 101142461B1
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South Korea
Prior art keywords
insulation resistance
resistor
capacitor
voltage
circuit
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KR1020080102441A
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Korean (ko)
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KR20100043413A (en
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박상현
양정환
임재환
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에스케이이노베이션 주식회사
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389Measuring internal impedance, internal conductance or related variables

Abstract

Insulation resistance measuring circuit according to an embodiment of the present invention, a capacitor (capacitor), a first resistor (resistance), and a second resistor, the RC circuit connected to the insulation resistance measurement battery; A voltage source for applying a voltage to the RC circuit; And a switch connected to the RC circuit and the voltage source, respectively, and configured to control the capacitor to be charged or discharged according to an on / off state.
Insulation Resistance, Hybrid, Capacitor, High Voltage Battery

Description

Insulation Resistance Measurement Circuit {INSULATION RESISTANCE MEASUREMENT CIRCUIT}

The present invention relates to an insulation resistance measuring circuit, and more particularly, to measuring insulation resistance between a chassis ground of a hybrid vehicle using a high voltage battery and the high voltage battery, a capacitor and a resistor in the high voltage battery. The insulation resistance is measured by measuring a magnitude of a current or voltage that connects an RC circuit consisting of a circuit, and applies or cuts a voltage for a predetermined time in the RC circuit to charge or discharge the capacitor of the RC circuit. It relates to an insulation resistance measuring circuit.

Hybrid vehicles using high voltage batteries have a system that automatically shuts down the main high voltage battery in the event of an emergency. The emergency refers to excessive leakage, insulation breakdown, etc., caused by a short circuit generated due to excessive leakage, insulation breakdown, etc. due to aging of related parts, and external shocks.

When an emergency occurs in the vehicle, the power is interrupted by issuing a command to shut down the main power from the upper part that controls high voltage components such as BMS (BATTERY MANAGEMENT SYSTEM) or HCU (HYBRID CONTROL UNIT). The high voltage-related components monitor the voltage and current of the line connecting the power through a series of programs or sensors to detect voltages, currents outside the normal range, leakage currents above the allowable value, and breakdown of insulation resistance above the allowable value. If present, the main power is shut off via CAN communication or signal transmission.

As such, the measurement of insulation resistance is very important in a hybrid vehicle using a high voltage battery. The method of measuring leakage current between a high voltage battery and a hybrid vehicle is to destroy the insulation and force a DC current to flow. This method has the disadvantage that the insulation is destroyed while measuring the insulation resistance.

In order to solve this problem, there is a method of connecting a coupling capacitor between a high voltage battery and a hybrid vehicle and measuring an insulation resistance component by applying an AC signal to the coupling capacitor. However, the above method also has a disadvantage in that a lot of constraints are placed on the circuit design because the current for charging the coupling capacitor and the current for discharging must pass through the same circuit.

Accordingly, in the insulation resistance measurement between the chassis ground of a hybrid vehicle and a high voltage battery, development of a miniaturized, lightweight, and low-cost insulation resistance measurement circuit capable of measuring insulation resistance more simply and accurately is required.

The present invention has been made to improve the prior art as described above, in the insulation resistance measurement of a hybrid vehicle, connecting a RC circuit composed of one capacitor and two resistors to the negative terminal of the high voltage battery of the hybrid vehicle, By measuring the insulation resistance by measuring the charging current or the discharge current of the capacitor by applying and blocking the voltage for a predetermined time in the RC circuit, insulation resistance that can measure the insulation resistance more simply and accurately at a minimum cost It is an object to provide a measuring circuit.

In addition, the present invention is configured by differently configuring the passage of the current for charging the capacitor and the current for discharging, by designing the size of the charging current and the discharge current of the capacitor differently if necessary, even in an environment where there is external noise through two current information It is an object of the present invention to provide an insulation resistance measuring circuit that can obtain more reliable information than the circuit of.

In addition, an object of the present invention is to provide a miniaturized, lightweight, and low-cost insulation resistance measurement circuit by measuring the insulation resistance by applying a voltage to the RC circuit composed of a capacitor and a resistor at regular intervals through an external power supply and a switch. do.

In order to achieve the above object and solve the problems of the prior art, the insulation resistance measuring circuit according to an embodiment of the present invention, a capacitor (capacitor), a first resistor (resistance), and a second resistor, and An RC circuit connected to the resistance measurement battery; A voltage source for applying a voltage to the RC circuit; And a switch connected to the RC circuit and the voltage source, respectively, and configured to control the capacitor to be charged or discharged according to an on / off state.

In addition, the capacitor and the second resistor of the insulation resistance measuring circuit according to an embodiment of the present invention is characterized in that the first resistor is connected in parallel with the capacitor and the second resistor.

In addition, the series connected capacitor and the second resistor of the insulation resistance measuring circuit according to an embodiment of the present invention is characterized in that it is connected to the negative terminal of the insulation resistance measuring battery.

In addition, the insulation resistance of the insulation resistance measurement battery of the insulation resistance measurement circuit according to an embodiment of the present invention is characterized in that it is connected in series with the capacitor and the second resistor.

In addition, the voltage source of the insulation resistance measuring circuit according to an embodiment of the present invention is characterized in that to supply and cut off the voltage for a predetermined time in the RC circuit.

In addition, in the insulation resistance measuring circuit according to an embodiment of the present invention, when the switch is turned on, the capacitor is charged according to the current flowing through the second resistor, the capacitor, and the insulation resistance. The voltage applied to the two resistors may correspond to the magnitude of the insulation resistance of the insulation resistance measurement battery.

In addition, the insulation resistance measuring circuit according to an embodiment of the present invention, when the switch is off (off), the capacitor is applied to the current flowing through the insulation resistance, the capacitor, the second resistor, and the first resistor. The voltage is discharged accordingly, and the voltage applied to the first resistor corresponds to the magnitude of the insulation resistance of the insulation resistance measurement battery.

In addition, the insulation resistance measurement battery of the insulation resistance measurement circuit according to an embodiment of the present invention is characterized in that the high voltage battery of the hybrid vehicle (hybrid).

According to the insulation resistance measuring circuit of the present invention, in the insulation resistance measurement of a hybrid vehicle, an RC circuit composed of one capacitor and two resistors is connected to the negative terminal of the high voltage battery of the hybrid vehicle, and the selected RC circuit is selected. By measuring the insulation resistance by measuring the charging or discharging current of the capacitor by applying and blocking a voltage for a time, it is possible to obtain the effect of measuring the insulation resistance more simply and accurately at a minimum cost.

In addition, according to the insulation resistance measuring circuit of the present invention, by configuring the path of the current charging and discharging the capacitor differently, the charge current and the discharge current of the capacitor is designed differently if necessary through two current information Even in the presence of external noise, it is possible to obtain more reliable information than conventional circuits.

In addition, according to the insulation resistance measuring circuit of the present invention, by applying a voltage to the RC circuit composed of a capacitor and a resistor at regular intervals through an external power supply and a switch, the insulation resistance is measured, thereby miniaturizing, reducing the weight, and reducing the insulation resistance. The effect of configuring the measuring circuit can be obtained.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of an insulation resistance measuring circuit according to an embodiment of the present invention.

The insulation resistance measuring circuit according to an embodiment of the present invention includes an RC circuit 120, a voltage source 130, and a switch 140. The RC circuit 120 includes a first resistor 121, a second resistor 122, and a capacitor 123.

The insulation resistance measurement circuit is connected to the negative terminal of the insulation resistance measurement battery 110. The insulation resistance measurement circuit may be connected to the negative terminal of the insulation resistance measurement battery 110 through the capacitor 123 of the RC circuit 120.

The insulation resistance measurement battery 110 may be implemented as a high voltage battery mounted in a hybrid vehicle.

The capacitor 123 and the second resistor 122 of the RC circuit 120 are connected in series. The first resistor 121 is connected in parallel with the capacitor 123 and the second resistor 122.

The series connected capacitor 123 and the second resistor 122 are connected in series with the insulation resistance 150 of the insulation resistance measurement battery 110.

The voltage source 130 applies a voltage to the RC circuit 120. The voltage source 130 may apply and cut off the voltage to the RC circuit 120 for a predetermined time. That is, the voltage source 130 applies the voltage to the RC circuit 120 during the first time when the switch 140 is on, and the RC during the second time when the switch 140 is off. The voltage applied to the circuit 120 may be cut off.

The voltage may be implemented with a constant voltage of 12V, and may be implemented with various constant voltage values as well as the 12V according to the judgment of those skilled in the art. The first time and the second time may be implemented as appropriate and various times according to the judgment of those skilled in the art.

The switch 140 is connected to the RC circuit 120 and the voltage source 130, respectively, and controls the capacitor 123 to be charged or discharged according to on / off. That is, the switch 140 maintains an on state so that the voltage supplied from the voltage source 130 is applied to the RC circuit 120 for the first time according to the judgment of a person skilled in the art, and then the first time expires. In this case, the voltage can be switched to the off state to block the application of the voltage.

An operator who measures the insulation resistance of the battery 110 through the insulation resistance measurement circuit of the present invention may measure the charge current or the discharge current of the capacitor 123 through the on / off control of the switch 140.

That is, the operator may measure the charging current of the capacitor 123 when the voltage is supplied from the voltage source 130 to the RC circuit 120 when the switch 140 is turned on, and the switch 140 is turned off. When the voltage is switched to the state and the voltage is not supplied from the voltage source 130 to the RC circuit 120, the discharge current of the capacitor 123 may be measured.

Current flow in the insulation resistance measuring circuit according to the on / off of the switch 140 will be described with reference to FIGS. 2 and 3.

2 is a diagram illustrating a current flow in an insulation resistance measuring circuit having a switch turned on according to an embodiment of the present invention.

When the switch 140 is on, a voltage is applied to the RC circuit 120 through the voltage source 130, so that the RC circuit 120 has a second resistor 122, a capacitor 123, and insulation. Current flows through the resistor 150. The capacitor 123 may be charged through the current. The magnitude of the current charging the capacitor 123 may be adjusted according to the resistance value of the second resistor 122.

3 is a diagram illustrating a current flow in an insulation resistance measuring circuit in which a switch is turned off according to an embodiment of the present invention.

When the switch 140 is turned off, since the supply of the voltage through the voltage source 130 is stopped, the capacitor 123 may discharge through the first resistor 121.

2 and 3, the resistance value of the first resistor 121 is R1, the resistance value of the second resistor 122 is R2, the capacitance value of the capacitor 123 is C, and the resistance value of the insulation resistor 150 is shown. In the case of R3, the current for charging the capacitor 123 while the switch 140 is on is expressed by Equation 1 below.

Figure 112008072603077-pat00001

In addition, a current for discharging the capacitor 123 while the switch 140 is turned off is expressed by Equation 2 below.

Figure 112008072603077-pat00002

In Equation 1, the current charging the capacitor 123 may be determined according to the second resistor 122 and the insulation resistance 150. In addition, in Equation 2, a current for discharging the capacitor 123 may be determined according to the first resistor 121, the second resistor 122, and the insulation resistance 150. Therefore, the current for charging the capacitor 123 and the current for discharging may be implemented differently through the first resistor 121.

In order to measure the current for charging or discharging the capacitor 123, voltages applied to the first resistor 121 and the second resistor 122 may be measured.

The voltage applied to the first resistor 121 while the switch 140 is on is expressed by Equation 3 below.

Figure 112008072603077-pat00003

The voltage applied to the first register 121 while the switch 140 is off is expressed by Equation 4.

Figure 112008072603077-pat00004

The voltage applied to the second register 122 while the switch 140 is on is expressed by Equation 5.

Figure 112008072603077-pat00005

The voltage applied to the second register 122 while the switch 140 is off is represented by Equation 6.

Figure 112008072603077-pat00006

In Equations 1 to 6,

Figure 112008072603077-pat00007
Where T denotes the switch period and V denotes the voltage of the voltage source 130.

Referring to Equations 3 to 6, when the switch 140 is turned off, the voltage applied to the first resistor 121 corresponds to a current for discharging the capacitor 123, and the switch 140 is turned on. The voltage applied to the second resistor 122 corresponds to the current for charging the capacitor 123. In addition, the magnitudes of the voltages applied to the first resistor 121 and the second resistor 122 may vary according to the resistance value of the insulation resistor 150.

Therefore, the magnitude of the insulation resistance 150 may be calculated by measuring the voltage applied to the first resistor 121 or the second resistor 122. As described above, since the voltage applied to the first resistor 121 or the second resistor 122 is measured at the time of charging or discharging, the magnitude of the insulation resistance 150 is calculated, so that information on the insulation resistance can be obtained twice. There is an advantage. That is, even if one measurement fails due to noise, the insulation state can be determined through other information. In addition, two pieces of information may be appropriately processed to obtain information on insulation resistance that maximizes reliability.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above-described embodiments, which can be variously modified and modified by those skilled in the art to which the present invention pertains. Modifications are possible. Accordingly, the spirit of the present invention should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will belong to the scope of the present invention.

1 is a view showing the configuration of an insulation resistance measuring circuit according to an embodiment of the present invention.

2 is a diagram illustrating a current flow in an insulation resistance measuring circuit having a switch turned on in accordance with an embodiment of the present invention.

3 is a diagram illustrating a current flow in an insulation resistance measuring circuit in which a switch is turned off according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: insulation resistance measurement battery

120: RC circuit

121: first register

122: second register

123: capacitor

130: voltage source

140: switch

150: insulation resistance

Claims (8)

  1. An RC circuit including a capacitor, a first resistor, and a second resistor, the RC circuit being connected to an insulation resistance measuring battery;
    A voltage source for applying a voltage to the RC circuit; And
    A switch connected to the RC circuit and the voltage source, respectively, for controlling the capacitor to be charged or discharged according to on / off
    Insulation resistance measuring circuit comprising a.
  2. The method of claim 1,
    And the capacitor and the second resistor are connected in series, and the first resistor is connected in parallel with the capacitor and the second resistor.
  3. delete
  4. The method of claim 1,
    The insulation resistance measurement circuit of the insulation resistance measurement battery, characterized in that connected in series with the capacitor and the second register.
  5. delete
  6. The method of claim 1,
    When the switch is turned on, the capacitor is charged according to the current flowing through the second resistor, the capacitor, and the insulation resistor, and the voltage applied to the second resistor is an insulation resistance of the insulation resistance measurement battery. Insulation resistance measuring circuit, characterized in that corresponding to the size of.
  7. The method of claim 1,
    When the switch is turned off, the capacitor is discharged according to the current flowing through the insulation resistor, the capacitor, the second resistor, and the first resistor, and the voltage applied to the first resistor is the insulation resistor. An insulation resistance measurement circuit, corresponding to the magnitude of insulation resistance of a measurement battery.
  8. delete
KR1020080102441A 2008-10-20 2008-10-20 Insulation resistance measurement circuit KR101142461B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190001330A (en) 2017-06-27 2019-01-04 주식회사 엘지화학 System and method for calculating insulation resistance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101354583B1 (en) 2010-09-17 2014-01-22 에스케이이노베이션 주식회사 Insulation resistance measurement circuit
EP2681571A2 (en) 2011-03-04 2014-01-08 Paceco Corp. Measurement of insulation resistance of configurable photovoltaic panels in a photovoltaic array
KR101435779B1 (en) * 2013-02-25 2014-08-29 주식회사 현대케피코 jig for measuring insulation resistance of bms
KR101898184B1 (en) * 2017-07-06 2018-09-12 현대오트론 주식회사 Method for measuring insulation resistance between high voltage battery and vehicle ground

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005156302A (en) * 2003-11-25 2005-06-16 Nissan Motor Co Ltd Internal resistance detection device and method of secondary battery

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005156302A (en) * 2003-11-25 2005-06-16 Nissan Motor Co Ltd Internal resistance detection device and method of secondary battery

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190001330A (en) 2017-06-27 2019-01-04 주식회사 엘지화학 System and method for calculating insulation resistance

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