WO2016144120A1 - 절연저항측정 장치 및 방법 - Google Patents
절연저항측정 장치 및 방법 Download PDFInfo
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- WO2016144120A1 WO2016144120A1 PCT/KR2016/002414 KR2016002414W WO2016144120A1 WO 2016144120 A1 WO2016144120 A1 WO 2016144120A1 KR 2016002414 W KR2016002414 W KR 2016002414W WO 2016144120 A1 WO2016144120 A1 WO 2016144120A1
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- voltage
- resistor
- insulation resistance
- adjustment
- operational amplifier
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- 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
- G01R19/145—Indicating the presence of current or voltage
- G01R19/15—Indicating the presence of current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
Definitions
- the present invention relates to an insulation resistance measuring apparatus, and more particularly, to an insulation resistance measuring apparatus capable of measuring an insulation resistance of a battery, and a method thereof.
- the measurement of insulation resistance is very important in an electric vehicle or a hybrid vehicle using a high voltage battery.
- a method of measuring the exposure current between a high voltage battery and a vehicle there is a method of breaking insulation and forcing a DC current, which has a disadvantage in that insulation is broken while measuring insulation resistance.
- the conventional insulation resistance measuring method connects a coupling capacitor between a positive terminal and a negative terminal of a high voltage battery and a vehicle, and applies an AC signal to the coupling capacitor to measure an insulation resistance component.
- This has the disadvantage that the circuit design is complicated because the current charging and discharging the coupling capacitor must pass through the same circuit, and the implementation of the circuit has many limitations.
- the present invention has been made in view of the above-described prior art, and an object thereof is to provide an insulation resistance measuring apparatus and method for measuring insulation resistance of a battery by connecting to a negative terminal of a high voltage battery including a secondary battery.
- an object of the present invention is to provide an insulation resistance measuring apparatus and method that can measure the insulation resistance by using an operational amplifier (OP-amp) so as not to be influenced by the outside.
- OP-amp operational amplifier
- an object of the present invention is to provide an insulation resistance measuring apparatus and method capable of measuring the insulation resistance without the influence of the high voltage battery voltage.
- Apparatus for measuring the insulation resistance of the battery for achieving the technical problem one end is electrically connected to the negative terminal of the battery;
- a shunt resistor connectable to the parameter resistor so that at least a part of the leakage current of the battery flowing through the parameter resistor flows, and an operational amplifier connected to both terminals of the shunt resistor to detect and output a voltage across the shunt resistor;
- a current detection circuit comprising;
- a switch control terminal for controlling a switch connected between the parameter resistor and the shunt resistor in an on or off state, a detection signal output terminal for selectively applying a first high voltage signal and a first low voltage signal to the shunt resistor;
- An adjustment signal output terminal configured to apply an adjustment voltage signal to the operational amplifier to adjust an output voltage of the operational amplifier within a preset range, an ADC connected to the output terminal of the operational amplifier, a first high voltage signal and a first high voltage signal to the shunt resistor;
- a controller for determining an insulation resistance of the battery using
- the adjustment signal output stage includes first and second adjustment signal output stages for selectively outputting a second high voltage signal and a second low voltage signal
- the current detection circuit further includes the first and second adjustment signals.
- first and second regulating resistors connected to an output terminal, respectively, wherein the first and second regulating resistors are connected in parallel to each other and one end thereof is connected to an inverting terminal of the operational amplifier.
- the current detection circuit includes a first connection resistor for connecting one end of the shunt resistor to a non-inverting terminal of the operational amplifier and a second connection resistor for connecting the other end of the shunt resistor to an inverting terminal of the operational amplifier. It may further include.
- control unit is configured to apply a first high voltage signal and a first low voltage signal to the shunt resistor at a time interval through the detection signal output terminal in a state where the switch is controlled to the on state.
- first high voltage signal and the first low voltage signal are applied to the shunt resistor, the first voltage change amount with respect to the output voltage of the operational amplifier may be configured to be measured by the ADC.
- control unit is configured to apply a third high voltage signal and a third low voltage signal to the shunt resistor at a time interval through the detection signal output terminal in a state where the switch is controlled to the off state.
- control unit if the output voltage of the operational amplifier measured by the ADC does not belong to the preset operating voltage range of the ADC, the first and until the output voltage belongs to the preset operating voltage range
- the second adjustment signal output terminal may be configured to selectively apply a second high voltage signal or a second low voltage signal to the first adjustment resistor and the second adjustment resistor.
- the predefined insulation resistance calculation formula is a voltage output through the first and second adjustment signal output terminal when a high voltage signal and a low voltage signal are applied to the shunt resistor through the detection signal output terminal.
- the level of the signal may further include an adjustment voltage change amount applied to the equivalent resistance of the first adjustment resistor and the second adjustment resistor as a parameter.
- the insulation resistance measuring apparatus may further include a memory unit in which the resistance value of the insulation resistance is stored.
- the controller may be configured to output the resistance value of the insulation resistance to an external control device.
- Insulation resistance measuring method for achieving the above technical problem, a parameter resistor connected to the negative terminal of the battery, a shunt resistor, a switch provided between the parameter resistor and the shunt resistor, the operation connected to both terminals of the shunt resistor
- the method according to the invention comprises the steps of controlling the switch to an off state; Applying a third high voltage signal and a third low voltage signal to the shunt resistor at time intervals through the detection signal output terminal; Measuring an output voltage of the operational amplifier when the third high voltage signal and the third low voltage signal are applied; Applying an adjustment voltage signal to one end of the adjustment resistor to adjust the output voltage of the operational amplifier to fall within a preset range; Determining a second voltage change amount with respect to an output voltage of the operational amplifier; Determining a third voltage change amount corresponding to a difference between the first voltage change amount and the second voltage change amount; And determining the insulation resistance of the battery using a predefined insulation resistance calculation formula including the third voltage change as a parameter.
- the regulating resistor includes at least two regulating resistors connected in parallel, one end of each regulating resistor may be connected to an inverting terminal of the operational amplifier.
- the present invention may further include selectively applying a second high voltage signal or a second low voltage signal to each adjustment resistor such that the output voltage of the operational amplifier falls within a preset range.
- the method of the present invention if the output voltage of the operational amplifier does not belong to a preset voltage range, the second high voltage signal or the second high voltage signal to each adjustment resistor until the output voltage of the associative amplifier belongs to the preset voltage range or And selectively applying a second low voltage signal.
- the predefined insulation resistance calculation formula may further include, as a parameter, an amount of adjustment voltage change applied to an adjustment resistor based on when a high voltage signal is applied to the shunt resistor and when a low voltage signal is applied. have.
- the method may further include storing the resistance value of the insulation resistance in the memory unit or outputting the resistance value of the insulation resistance to an external control device.
- the insulation resistance can be measured by using an operational amplifier (OP-amp), the insulation resistance can be accurately measured without being influenced by external influences.
- OP-amp operational amplifier
- the insulation resistance may be measured by connecting to the negative terminal of the high voltage battery. Therefore, since expensive circuit components having excellent withstand voltage characteristics are not required, insulation resistance can be measured more simply at minimum cost.
- the insulation resistance can be measured accurately.
- FIG. 1 is a circuit diagram of an insulation resistance measuring apparatus according to an embodiment of the present invention.
- FIG. 2 is a specific circuit diagram of an insulation resistance measuring apparatus according to an embodiment of the present invention.
- FIG. 3 is a schematic equivalent circuit diagram when the controller of the insulation resistance measuring apparatus shown in FIG. 2 controls the switch SW to be in an on state.
- FIG. 4 is a schematic equivalent circuit diagram when the controller of the insulation resistance measuring apparatus shown in FIG. 2 controls the switch SW to be in an off state.
- 5 and 6 are flowcharts illustrating a method of measuring insulation resistance when the switch SW is turned on according to an embodiment of the present invention.
- FIG. 7 and 8 are flowcharts illustrating a method of measuring insulation resistance when the switch SW is in an OFF state according to an embodiment of the present invention.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- a function or operation specified in a specific block may occur differently from the order specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, and the blocks may be performed upside down depending on the function or operation involved.
- FIG. 1 is a circuit diagram of an insulation resistance measuring apparatus 1 according to an embodiment of the present invention.
- the insulation resistance measuring apparatus 1 may include a controller 10, a current detection circuit 20, a parameter resistor 30, and a switch SW.
- One end of the parameter resistor 30 may be electrically connected to the negative terminal of the high voltage battery 40.
- the parameter resistor 30 may be used as a parameter in the process of determining the insulation resistance 41 according to the present invention.
- the parameter resistor 30 has a fairly large resistance value, for example a resistance value of several M ⁇ .
- the insulation resistance measuring apparatus 1 operating at a lower voltage than the high voltage battery 40 may be electrically protected from the high voltage battery 40.
- the high voltage battery 40 includes a plurality of secondary batteries connected in series and / or in parallel.
- the high voltage battery 40 refers to a large capacity battery used in an electric vehicle, a hybrid vehicle, a power storage device, or the like.
- the secondary battery included in the high voltage battery 40 may be a lithium secondary battery, but the present invention is not limited thereto. In addition, this invention is not limited by the kind of load apparatus in which the high voltage battery 40 is mounted.
- the high voltage battery 40 needs to monitor whether the insulation resistance 41 is destroyed. When the insulation resistance 41 is broken, a leakage current flows from the high voltage battery 40 to the periphery thereof. Leakage current can damage electronic components in the load device or cause electric shock. Diagnosis of the breakdown of the insulation resistance 41 is performed by judging whether or not the resistance value of the insulation resistance 41 has decreased below a predetermined reference value.
- the insulation resistance 41 of the high voltage battery 40 may be changed by environmental factors such as capacitance component, temperature, and humidity existing between the high voltage battery 40 and the load device.
- the control unit 10 controls the on / off state of the detection signal output terminal VDv, the adjustment signal output terminal CXv, the analog digital converter (ADC), and the switch SW (On / Off). It may include. The functions of the detection signal output terminal VDv and the adjustment signal output terminal CXv will be described later in detail.
- the controller 10 may be a micro controller unit or a central processing unit (CPU).
- the insulation resistance measuring apparatus 1 may include a power supply unit 12 to supply a driving voltage Vdd to the controller 10 and the current detection circuit 20.
- the power supply unit 12 receives power supplied from a commercial power supply or a load device, converts it into a DC-type driving voltage Vdd, and supplies the power to each component that requires power.
- the controller 10 controls the switch SW to either an on or off state through the switch control terminal On / Off.
- the control unit 10 may output the first high voltage signal or the first low voltage signal to the current detection circuit 20 through the detection signal output terminal VDv when the switch SW is turned on or off. have.
- the first high voltage signal may be a voltage signal having substantially the same voltage level and magnitude as the driving voltage Vdd applied by the power supply unit 12 to the controller 10 and the current detection circuit 20.
- the low voltage signal may be a ground signal.
- the control unit 10 controls the switch SW to be in an on or off state, and in each state, the leakage current of the high voltage battery 40 flowing toward the insulation resistance measuring device 1 through the parameter resistor 30 is measured by a current detection circuit ( 20, and a voltage applied between both ends of the shunt resistor RS inside the current detection circuit 20 due to leakage current may be input as a digital signal through the ADC.
- the adjustment signal output terminal CXv is a current detection circuit so that the magnitude of the voltage (corresponding to the voltage applied between both ends of the shunt resistor RS) output from the current detection circuit 20 is included in the preset optimum operating voltage range of the ADC.
- the voltage adjustment signal may be a second high voltage signal or a second low voltage signal.
- the voltage adjustment signal may be composed of a plurality of signals, and each signal may be one of a second high voltage signal and a second low voltage signal.
- the second high voltage signal may be a voltage signal substantially the same as the level of the driving voltage Vdd, and the second low voltage signal may be a ground (Gnd) signal.
- the predetermined optimum operating voltage range may be set in the range of 0.5V to 4.5V.
- the controller 10 may control the switch SW connecting the insulation resistance measuring apparatus 1 to the negative terminal of the high voltage battery 40 through an on / off switch control terminal in an on or off state.
- the current detection circuit 20 When the switch SW is turned on or off under the control of the controller 10, the current detection circuit 20 outputs a first high voltage signal or a first low voltage signal from the detection signal output terminal VDv. In response to the signal output, a voltage applied between both terminals of the shunt resistor RS may be detected and output to the ADC of the controller 10 due to the leakage current of the high voltage battery 40.
- the controller 10 receives a voltage applied between both terminals of the shunt resistor RS from the current detection circuit 20 through the ADC through on or off control of the switch SW, and then the current detection circuit 20
- the resistance value of the insulation resistor 41 may be quantitatively calculated by using a predefined insulation resistance calculation equation in consideration of the connection relationship between circuit elements constituting the circuit.
- the resistance value of the insulation resistance 41 can be calculated when the switch SW is in the on state and in the off state, respectively.
- FIG. 2 is a specific circuit diagram of the insulation resistance measuring apparatus 1 according to the embodiment of the present invention.
- the current detection circuit 20 includes an operational amplifier OP-amp connected to the shunt resistor RS.
- the non-inverting terminal (+) and the inverting terminal (-) of the operational amplifier OP-amp are connected to both terminals of the shunt resistor RS through the first connection resistor R2 and the second connection resistor R3. Each is connected.
- the non-inverting terminal + of the operational amplifier OP-amp is connected to the intermediate connection node CV of the first voltage division resistor R1 and the second voltage division resistor R5.
- the shunt resistor RS is connected to the parameter resistor 30 through a switch SW. Therefore, when the switch SW is turned on, at least a part of the leakage current of the high voltage battery 40 flowing through the parameter resistor 30 flows through the shunt resistor RS. The leakage current flows when the insulation of the high voltage battery 40 is broken. When insulation breaks down, the resistance value of the insulation resistance 41 decreases below a predetermined reference value.
- An inverting terminal ( ⁇ ) of the operational amplifier OP-amp is connected to an adjustment resistor for applying a voltage adjustment signal such that an output voltage magnitude of the operational amplifier OP-amp falls within a preset range.
- the preset range corresponds to the optimum operating voltage range of the ADC.
- the regulating resistor comprises at least a first regulating resistor RA and a second regulating resistor RB.
- One end of the first adjusting resistor RA and the second adjusting resistor RB is connected to an inverting terminal ( ⁇ ) of the operational amplifier OP-amp.
- the first regulating resistor RA and the second regulating resistor RB are connected in parallel with each other.
- the number of regulating resistors is not limited to two, so the number can increase to three or more. The large number of adjustment resistors allows for finer adjustment of the output voltage of the op amp. As the number of adjusting resistors increases, the number of terminals constituting the adjusting signal output terminal CXv may increase accordingly.
- the adjustment signal output terminal CXv of the controller 10 is configured to selectively output a second high voltage signal or a second low voltage signal to each of the first adjustment resistor RA and the second adjustment resistor RB. And a first adjustment signal output terminal CAv and a second adjustment signal output terminal CBv.
- the number of terminals constituting the adjustment signal output terminal CXv may be changed to correspond to the number of adjustment resistors. That is, if the number of adjusting resistors is three, the number of terminals constituting the adjusting signal output terminal CXv may be three.
- the output terminal and the inverting terminal (-) of the operational amplifier (OP-amp) is connected to each other through a feedback resistor (R4).
- the driving power supply Vdd supplied from the power supply unit 12 is applied to the associating amplifier OP-amp.
- the driving power source Vdd may be depressurized by the ratio of the first voltage division resistor R1 and the second voltage division resistor R5 and applied to the non-inverting terminal + of the operational amplifier OP-amp. .
- the operational amplifier OP-amp connects the voltage applied between both terminals of the shunt resistor RS to the node BV of the output terminal when at least a part of the leakage current flows through the shunt resistor RS. Output to the input terminal of.
- the expression representing the voltage BV of the node BV to which the output voltage of the operational amplifier OP-amp is applied may be derived through the following process.
- Equation 1 When Kirchhoff's current law is applied at the inverting terminal (-) of the operational amplifier OP-amp, the formula of the first row included in Equation 1 below is derived. When the formula in the first row is arranged according to Ohm's law, the formula shown in the second row of Equation 1 below is obtained.
- the non-inverting terminal (+) and the inverting terminal (-) of the operational amplifier OP-amp are virtually shorted, it may be assumed that the voltages of both terminals are the same. That is, the voltage applied to the inverting terminal ( ⁇ ) may be regarded as the same as the voltage CV applied to the node CV. According to this assumption, the formula of the second row may be arranged with respect to the voltage BV of the node BV to derive the formula of the last row included in Equation 1 below.
- I RA is The current flowing through the first regulating resistor RA
- I RB is The current flowing through the second adjustment resistor RB
- I R4 is the current flowing through the feedback resistor R4
- I3 is the current flowing through the second connection resistor R3.
- CAv is an output voltage of the first adjustment signal output terminal CAv
- CBv is an output voltage of the second adjustment signal output terminal CBv.
- Bv is the voltage of the node BV
- Av is the voltage of the node AV
- Cv is the voltage of the node CV.
- RA is the resistance value of the first adjustment resistor
- RB is the resistance value of the second adjustment resistor
- R4 is the resistance value of the padback resistor
- R3 is the resistance value of the second connection resistor.
- Equation 2 the formula of the first row included in Equation 2 below is derived.
- the formula of the second row of Equation 2 is obtained.
- the non-inverting terminal (+) and the inverting terminal (-) of the operational amplifier OP-amp are virtually shorted, it may be assumed that the voltages of both terminals are the same. Also, since the non-inverting terminal (+) and the inverting terminal (-) have infinite input impedance, the current input to each terminal can be regarded as zero.
- IS is The current flowing through the shunt resistor (RS), I3 The current flowing through the second connection resistor R3, Im is the leakage current flowing through the parameter resistance RF, VDv is the output voltage of the detection signal output terminal, EB is the voltage of the high voltage battery 40, CAv is the first adjustment signal output terminal ( The output voltage of CAv, CBv is the output voltage of the second adjustment signal output terminal CBv, Bv is the voltage of the node BV, Av is the voltage of the node AV, Cv is the voltage of the node CV, RA is zero 1 resistance value of the regulating resistor, RB is the resistance value of the second regulating resistor, R4 is the resistance value of the feedback resistor, R3 is the resistance value of the second connection resistor, RL is the resistance value of the insulation resistance, and RF is the resistance of the parameter resistance. Value.
- Equation 3 Arranging the equation in the first row according to Ohm's law yields the equation shown in the second row of equation (3).
- the non-inverting terminal (+) and the inverting terminal (-) of the operational amplifier OP-amp are virtually shorted, it may be assumed that the voltages of both terminals are the same. Also, since the non-inverting terminal (+) and the inverting terminal (-) have infinite input impedance, the current input to each terminal can be regarded as zero.
- I R5 is Current flowing through the first voltage distribution resistor
- I R2 is the current flowing through the first connection resistor R2
- I R1 is the current flowing through the second voltage distribution resistor
- Vdd is the driving voltage applied to the first voltage distribution resistor
- VDv is The output voltage of the detection signal output terminal
- Cv is the voltage of the node CV
- R1 is the resistance value of the second voltage distribution resistor
- R2 is the resistance value of the first connection resistor
- R5 is the resistance value of the first voltage distribution resistor.
- the resistance ratio for each resistor is as follows so that an appropriate level of voltage is output from the operational amplifier (OP-amp) when at least a portion of the leakage current flows through the shunt resistor (RS) Can be set together.
- the present invention is not limited thereto.
- FIG. 3 is an equivalent circuit diagram of a simplified circuit when the control unit 10 of the insulation resistance measuring apparatus 1 shown in FIG. 2 controls the switch SW to an on state.
- the leakage current of the high voltage battery 40 flowing through the insulation resistance RL and the parameter resistance RF is Im, and the current flowing from the leakage current Im to the shunt resistor RS is adjusted to IS.
- the current flowing through the resistor RC is denoted by I3.
- the adjusting resistor RC includes the first adjusting resistor RA and the second adjusting RB connected in parallel through the first adjusting signal output terminal CAv and the second adjusting signal output terminal CBv in FIG. 2.
- the DC voltage CXv represents a DC voltage that is consequently applied to the adjustment resistor RC, which is an equivalent resistance, according to the voltage level output from the first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv.
- the magnitude of the DC voltage CXv may be predefined and stored in the memory unit 11 according to a combination of voltage levels output from the first adjustment signal output terminal CAv and the second adjustment output terminal CBv.
- the memory unit 11 is a device capable of storing information, such as DRAM, SRAM, ROM, EEPROM, Flash Memory, Register, etc., there is no particular limitation on the type thereof.
- first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv may selectively output the second high voltage signal or the second low voltage signal by the controller 10.
- the second high voltage signal may be a voltage having substantially the same magnitude as the driving voltage Vdd, and the second low voltage signal may be a ground voltage Gnd.
- the adjustment resistor RC the first adjustment signal output terminal (CAv) outputs a second high voltage signal
- the second adjustment signal output terminal (CBv) outputs a second high voltage signal
- the first Both the regulating resistor RA and the second regulating resistor RB are substantially equal to the equivalent resistance determined from the circuit having the structure connected to the DC voltage applying the high voltage Vdd.
- the adjusting resistor RC may include the first adjusting signal RC when the first adjusting signal output terminal CAv outputs the second high voltage signal and the second adjusting signal output terminal CBv outputs the second low voltage signal.
- the regulating resistor RA is connected to the DC voltage applying the high voltage Vdd, and the second regulating resistor RB is substantially equivalent to the equivalent resistance determined from the circuit having the structure connected to the ground applying the low voltage Gnd. same.
- the first regulating resistor RA is connected to the ground applying the low voltage Gnd and the second regulating resistor RB is substantially equivalent to the equivalent resistance determined from the circuit having the structure connected to the DC voltage applying the high voltage Vdd.
- the adjusting resistor RC may include the first adjusting signal RC when the first adjusting signal output terminal CAv outputs the second low voltage signal and the second adjusting signal output terminal CBv outputs the second low voltage signal.
- Both the first regulating resistor RA and the second regulating resistor RB are substantially equal to the equivalent resistance determined from the circuit having the structure connected to the ground to which the low voltage Gnd is applied.
- the controller 10 is such that the current measuring circuit 20 is connected between both terminals of the shunt resistor RS when at least a part of the current derived from the leakage current of the high voltage battery 40 flows through the shunt resistor RS.
- the second high voltage signal and the second low voltage signal are selectively applied to the first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv.
- the inverting terminal of the operational amplifier OP-amp connected to the first adjusting resistor RA and the second adjusting resistor RB connected in parallel through the first adjusting signal output terminal CAv and the second adjusting signal output terminal CBv. Change the voltage applied to-).
- control unit 10 at the first adjustment signal output terminal (CAv) and the second adjustment signal output terminal (CBv) so that the magnitude of the voltage output from the operational amplifier (OP-amp) within the optimum operating voltage range of the ADC The output voltage level can be adjusted.
- the controller 10 may combine the second high voltage signal or the second low voltage signal in a predetermined order through the first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv.
- the output voltage of the operational amplifier (OP-amp) can be included in the range of 0.5V to 4.5V which is the optimum operating voltage range of the ADC.
- the level adjustment of the voltage signal output from the first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv may be such that the output voltage of the operational amplifier OP-amp is outside the optimum operating voltage range of the ADC. It can be executed whenever a condition is met.
- the controller 10 is not limited to the first adjustment signal output terminal CAv and the second adjustment signal output terminal CBv, and may further include more adjustment signal output terminals. As such, when the controller 10 includes more adjustment signal output stages, the output voltage of the operational amplifier OP-amp may be finely adjusted.
- the equation for calculating the leakage current Im of the high voltage battery 40 is Kirchhoff at a common node where the switch SW, the shunt resistor RS, and the regulating resistor RC are connected to each other. Obtained by applying Kirchhoff's current law.
- Equation 4 the equation in the first row corresponds to the equation for calculating the magnitude of the leakage current (Im).
- the current IS flowing through the shunt resistor RS is applied to Kirchhoff's voltage law (KVL) based on mesh 1 and mesh 2 shown in FIG. 3 to derive two simultaneous equations and to obtain current IS. You can get it by solving the system of equations.
- KVL Kirchhoff's voltage law
- Equation 4 the equation in the last row corresponds to the equation for calculating the magnitude of the current IS flowing through the shunt resistor RS.
- Im is the leakage current of the high voltage battery 40
- IS Current flowing through the shunt resistor RS
- I3 is the current flowing through the second connection resistor R3
- VDv is the output voltage of the detection signal output terminal
- EB is the voltage of the high voltage battery 40
- CXv is the first and second adjustment signals
- RL is the resistance value of the insulation resistance
- RF is the resistance value of the parameter resistance
- Rm is the summation resistance value of the insulation resistance RL and the parameter resistance RF
- RC is the equivalent of the first adjustment resistor RA and the second adjustment resistor RB.
- the resistance value of the adjusting resistor which is the resistance.
- the control unit 10 applies the first high voltage signal and the first low voltage signal to the detection signal output terminal VDv at intervals of time while the switch SW is turned on, the shunt resistor RS If the voltage difference applied between both terminals is expressed as the first voltage change amount ⁇ V (on), the first and second rows included in Equation 5 below may be derived.
- the first voltage change amount ⁇ V (on) is the first high voltage at different points of time through the detection signal output terminal VDv while the controller 10 controls the switch SW to be in an on state.
- the signal and the first low voltage signal are applied to the shunt resistor RS, they correspond to the difference in voltage applied between both terminals of the shunt resistor RS.
- IS (VDv on ) is a current IS flowing through the shunt resistor RS when the output voltage of the detection signal output terminal VDv is the first high voltage signal. Is the size.
- IS (VDv off ) is the magnitude of the current IS flowing through the shunt resistor RS when the output voltage of the detection signal output terminal VDv is the first low voltage signal.
- ⁇ CXv is the first and second adjustment signal output terminals while the controller 10 applies the first high voltage signal and the first low voltage signal to the shunt resistor RS at different time points through the detection signal output terminal VDv.
- This is the amount of change in the adjustment voltage applied to the adjustment resistor RC, which is an equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB, as a result of the voltage output from CAv and CBv.
- the adjustment voltage change amount ⁇ CXv is a voltage applied to the adjustment resistor RC while the first low voltage signal is applied to the shunt resistor RS through the detection signal output terminal VDv, and the detection signal output terminal VDv.
- the first high voltage signal corresponds to a difference in voltage applied to the adjusting resistor RC while the first high voltage signal is applied to the shunt resistor RS.
- the controller 10 may level the voltage output from the first and second adjustment signal output terminals CAv and CBv. Can be changed adaptively, in which case the changed voltage can be considered as the voltage applied to the adjusting resistor RC.
- RS is the resistance value of the shunt resistor
- RL is the resistance value of the insulation resistance
- RF is the resistance value of the parameter resistance
- Rm is the combined resistance value of the insulation resistance RL and the parameter resistance RF
- RC is the first regulating resistor.
- the resistance value of the adjusting resistor which is the equivalent resistance between RA and the second adjusting resistor RB.
- the controller 10 may quantitatively determine the resistance value of the insulation resistance RL of the high voltage battery 40 by using the formula defined in the last row of Equation 5.
- resistance values may be predefined and stored in the memory unit 11.
- Vdd corresponds to a driving voltage.
- the adjustment voltage change amount ⁇ CXv may be previously determined by a combination of voltage levels output from the first and second adjustment signal output terminals CAv and CBv.
- control unit 10 may be configured to, when the first high voltage signal and the first low voltage signal are applied to the shunt resistor RS at a time interval through the detection signal output terminal VDv, of the operational amplifier OP-amp.
- the first voltage change amount ⁇ V (on) may be determined based on the difference of the voltage Bv measured by the ADC connected to the output terminal.
- controller 10 may simply determine the resistance value of the insulation resistance RL from the predefined insulation resistance calculation formula as shown in Equation 5 using the first voltage change amount ⁇ V (on).
- the controller 10 may store the determined resistance value of the insulation resistance RL in the memory unit 11 or output it to the external control device 50 through a communication interface.
- the controller 10 generates an alarm message indicating that the insulation of the high voltage battery 40 has been destroyed when the size of the determined insulation resistance RL is smaller than a preset reference value, and then the external control device 50 via the communication interface. ) Can be sent.
- the external control device 50 may visually express the alarm message through the display, or may visually express the alarm message through the speaker.
- the display and the speaker may be electrically coupled with an external control device 50.
- FIG. 4 is an equivalent circuit diagram of the circuit of FIG. 2 simplified when the control unit 10 of the insulation resistance measuring apparatus 1 shown in FIG. 2 controls the switch SW to be in an off state.
- the current flowing through the shunt resistor RS is represented by IS
- the current flowing through the adjusting resistor RC which is an equivalent resistance between the first regulating resistor RA and the second regulating resistor RB, is represented by I 3. .
- Equation 6 By applying Kirchhoff's voltage law (KVL) based on mesh 3 shown in FIG. 4, the equation of the first row included in Equation 6 below can be derived.
- KVL Kirchhoff's voltage law
- the current IS flowing through the shunt resistor RS may be derived as in the third row by using the equation in the second row.
- the second voltage change amount ⁇ V (off) which is a difference between voltages applied to both terminals of the shunt resistor RS, may be determined by an expression of the last row included in Equation 6 below.
- CXv is an adjustment that is an equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB when the output voltage of the detection signal output terminal VDv is the third high voltage signal or the third low voltage signal.
- the voltage applied to the resistor RC is an adjustment that is an equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB when the output voltage of the detection signal output terminal VDv is the third high voltage signal or the third low voltage signal.
- the first high voltage signal may be a voltage signal having substantially the same voltage level and magnitude as the driving voltage Vdd applied by the power supply unit 12 to the controller 10 and the current detection circuit 20.
- the low voltage signal may be a ground signal.
- CXv is determined by the controller 10 at the first and second adjustment signal output terminals CAv and CBv. It can be changed by adjusting the output voltage level.
- the adjustment voltage change amount ⁇ CXv is the third high voltage signal and the third high voltage signal to the shunt resistor RS side through the detection signal output terminal VDv at intervals with the control unit 10 turning off the switch SW.
- the change in CXv corresponds to the change in CXv.
- IS (VDv on ) is the current flowing through the shunt resistor RS when the output voltage of the detection signal output terminal VDv is the third high voltage signal, and IS (VDv off ) is detected.
- the output voltage of the signal output terminal VDv is the third low voltage signal, this indicates a current flowing through the shunt resistor RS.
- RS is the resistance value of the shunt resistor
- RC is the resistance value of the adjustment resistor, which is an equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB.
- the second voltage change amount ⁇ V (off) is a third high voltage signal to the shunt resistor RS through the detection signal output terminal VDv at a time interval while the control unit 10 turns off the switch SW. And a change amount of the voltage applied to the shunt resistor RS when the third low voltage signal is applied.
- the controller 10 applies a third high voltage signal and a third low voltage signal to the shunt resistor RS side through the detection signal output terminal VDx at a time interval while the switch SW is turned off, and calculates
- the second voltage change ⁇ V (off) may be measured through an ADC connected to the output terminal of the amplifier OP-amp.
- the switch SW when the switch SW is in the ON state, the first voltage change amount ⁇ V (on) measured by the operational amplifier OP-amp and when the switch SW is in the OFF state, the operational amplifier OP-amp. If the difference between the second voltage change ⁇ V (off) measured through the third voltage change ⁇ VX is defined, the third voltage change ⁇ VX is the first and second included in Equation 7 below. It can be represented by a formula in a row.
- Equation 7 the formula of the third row of Equation 7 is obtained.
- ⁇ V (on), ⁇ V (off), ⁇ VX and ⁇ CXv are substantially the same as defined above.
- RS is the resistance value of the shunt resistor
- RC is the resistance value of the adjustment resistor which is the equivalent resistance of the first adjustment resistor (RA) and the second adjustment resistor (RB)
- RL is the resistance value of the insulation resistance
- RF is the parameter resistance
- the resistance value, Rm corresponds to the sum of the insulation resistance RL and the parameter resistance RF.
- the controller 10 controls the switch SW to be in an on state and an off state, and the first voltage change amount ⁇ V (on) and the second voltage change amount ⁇ V through an ADC connected to the output terminal of the operational amplifier OP-amp. (off)).
- the first voltage change amount ⁇ V (on) corresponds to the output voltage change amount of the operational amplifier OP-amp when the switch SW is on
- the second voltage change amount ⁇ V (off) corresponds to the switch ( It corresponds to the output voltage change amount of the operational amplifier (OP-amp) when SW) is off.
- the controller 10 may determine ⁇ VX from ⁇ V (on) and ⁇ V (off).
- the controller 10 may calculate a third voltage change amount ⁇ VX calculated from a predefined resistance value, a driving voltage Vdd, a first voltage change amount ⁇ V (on), and a second voltage change amount ⁇ V (off). And substituting the adjustment voltage change amount ⁇ CXv determined according to the change in the voltage level output from the first and second adjustment signal output terminals CAv and CBv into the insulation resistance calculation formula of Equation 7 to thereby determine the resistance of the insulation resistance RL.
- the value can be determined quantitatively.
- the controller 10 may store the resistance value of the insulation resistor RL determined when the switch SW is in the off state, in the memory unit 11. In addition, when the resistance value of the insulation resistance RL is smaller than a preset reference value, the controller 10 may generate an alarm message and output the alarm message to the external control device 50 through the communication interface.
- the external control device 50 may visually express a message indicating that the insulation of the high voltage battery 40 has been destroyed through a display or audibly through a speaker. .
- 5 and 6 are flowcharts illustrating a method in which the controller 10 determines a resistance value of the insulation resistor RL when the switch SW is in an on state.
- step S10 the controller 10 controls the switch SW to the ON state through the switch control terminal (on / off).
- step S20 the controller 10 applies a first high voltage signal to the shunt resistor RS through the detection signal output terminal VDv, and in step S30, the first and second adjustment signal output terminals CAv and CBv.
- a preset second high voltage signal or second low voltage signal is applied to the.
- step S40 the controller 10 measures the voltage Bv 1 applied between both terminals of the shunt resistor RS through the ADC connected to the output terminal of the operational amplifier OP-amp.
- step S50 the controller 10 determines whether the voltage Bv 1 is within the optimum operating voltage range of the ADC.
- step S50 If it is determined in step S50 that the voltage Bv 1 belongs to the optimum operating voltage range of the ADC, the controller 10 proceeds to the next step.
- the optimum operating voltage range may be 0.5V to 4.5V.
- step S50 determines whether the voltage Bv 1 does not belong to the optimum operating voltage range of the ADC. If it is determined in step S50 that the voltage Bv 1 does not belong to the optimum operating voltage range of the ADC, the controller 10 proceeds to step S60. That is, in step S60, the controller 10 adjusts the voltage levels of the first and second adjustment signal output terminals CAv and CBv in accordance with a predetermined signal combination order, and proceeds to step S40 again to measure the voltage Bv 1 . Determine whether the process and the measured voltage (Bv 1 ) are within the ADC's optimum operating voltage range. Preferably, the execution of steps S40, S50 and S60 are repeated until the measured voltage Bv 1 falls within the optimum operating voltage range of the ADC.
- step S50 If it is determined in step S50 that the voltage Bv 1 belongs to the optimum operating voltage range of the ADC, the controller 10 applies the first low voltage signal to the shunt resistor RS through the detection signal output terminal VDv in step S70. do.
- step S80 the controller 10 measures the voltage Bv 0 applied between both terminals of the shunt resistor RS through the ADC connected to the output terminal of the operational amplifier OP-amp.
- step S90 the controller 10 determines whether the voltage Bv 0 is within the optimum operating voltage range of the ADC.
- step S90 If it is determined in step S90 that the voltage Bv 0 belongs to the optimum operating voltage range of the ADC, the controller 10 proceeds to the next step. On the other hand, if it is determined in step S90 that the voltage Bv 0 does not belong to the optimum operating voltage range of the ADC, the controller 10 proceeds to step S100.
- step S100 the controller 10 adjusts the voltage levels of the first and second adjustment signal output terminals CAv and CBv in accordance with a predetermined signal combination order, and then proceeds to step S80 to measure the voltage Bv 0 . Determine whether the measured voltage Bv 0 is within the optimum operating voltage range of the ADC. Preferably, the execution of steps S80, S90 and S100 are repeated until the measured voltage Bv 0 falls within the optimum operating voltage range of the ADC.
- step S90 If it is determined in step S90 that the voltage Bv 0 is within the optimum operating voltage range of the ADC, the controller 10 determines the voltage Bv 1 measured in step S40 in step S110 and the voltage Bv measured in step S80. The first voltage change amount ⁇ V (on) corresponding to the difference of 0 ) is determined.
- step S120 the controller 10 adjusts the adjustment resistor RC from the signal combination of the first and second adjustment signal output terminals Cav and CBv, which causes the measured voltage Bv 1 to fall within the optimum operating voltage range of the ADC. Determine the adjustment voltage CXv 1 applied to.
- the controller 10 adjusts the adjustment voltage applied to the adjustment resistor RC from a signal combination of the first and second adjustment signal output terminals Cav and CBv, which causes the measured voltage Bv 0 to fall within the optimum operating voltage range of the ADC.
- CXv 0 is determined, and the amount of adjustment voltage change ⁇ CVx is determined from CXv 1 and CXv 0 .
- CXv 1 is a signal combination of the first and second adjustment signal output stages Cav and CBv, which causes the measured voltage Bv 1 to fall within the optimum operating voltage range of the ADC.
- the DC voltage is applied to the adjustment resistor RC corresponding to the equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB.
- CXv 0 is a signal combination of the first and second adjustment signal output stages Cav and CBv which causes the measured voltage Bv 0 to fall within the ADC's optimum operating voltage range.
- the DC voltage is applied to the adjustment resistor RC corresponding to the equivalent resistance of the first adjustment resistor RA and the second adjustment resistor RB.
- Magnitude of the DC voltage through an experiment according to the signal combination of the first and second adjustment signal output terminal (Cav, CBv) is determined in advance may be stored in memory unit 11, a control unit 10 a voltage (Bv 0 , Bv 1 ) may identify signal combinations of the first and second adjustment signal output terminals Cav and CBv applied to the measurement of Bv 1 , and determine CXv 0 and CXv 1 corresponding to the identified signal combination with reference to the memory unit 11. have.
- the controller 10 may use the determined first voltage change amount ⁇ V (on), the adjustment voltage change amount ⁇ CVx, the predefined resistance values, and the driving voltage Vdd.
- the resistance value of the insulation resistance RL is determined quantitatively from the insulation resistance calculation formula.
- step S140 the controller 10 may store the determined resistance value of the insulation resistance RL in the memory unit 11 or output it to the external control device 50.
- the controller 10 generates an alarm message indicating that the insulation of the high voltage battery 40 is destroyed when the resistance value of the insulation resistance RL determined in step S130 is smaller than a preset reference value. It can be output to the external control device 50 through the communication interface.
- the external control device 50 may express the alarm message visually through the display or acoustically through the speaker.
- FIG. 7 and 8 are flowcharts illustrating a method of determining a resistance value of the insulation resistor RL when the switch SW is in an off state.
- control unit 10 controls the switch SW to the off state through the switch control terminal on / off.
- step P20 sequentially proceeds from step P20 to step P100 and applies a third high voltage signal and a third low voltage signal to the shunt resistor RS through the detection signal output terminal VDx at intervals of time.
- the voltage Bv 1 and Bv 0 applied to both terminals of the shunt resistor RS are measured through the ADC connected to the output terminal of the operational amplifier OP-amp within the optimum operating voltage range of the ADC.
- the voltage Bv 1 is a voltage applied to both terminals of the shunt resistor RS when the third high voltage signal is output through the detection signal output terminal VDx
- the voltage Bv 0 is the detection signal output terminal ( When the third low voltage signal is output through VDx), it is a voltage applied to both terminals of the shunt resistor RS.
- steps P20 to P100 are substantially the same as the above-described steps S20 to S100, repeated descriptions thereof will be omitted.
- the controller 10 determines the second voltage change amount ⁇ V (off) from the two voltages Bv 1 and Bv 0 measured in step P110. Further, when the switch SW is in the on state, the third voltage change amount corresponding to the difference between the first voltage change amount ⁇ V (on) and the second voltage change amount ⁇ V (off) determined in step S110. VX).
- step P120 the controller 10 determines the adjustment voltage change amount ⁇ CVx in substantially the same manner as in step S120.
- step P130 the controller 10 uses the determined third voltage change amount ⁇ VX, the adjustment voltage change amount ⁇ CVx, predefined resistance values, and the driving voltage Vdd to calculate the insulation resistance of Equation 7 below. From the quantitatively determine the resistance value of the insulation resistance (RL).
- step P140 the controller 10 may store the determined resistance value of the insulation resistance RL in the memory unit 11 or output it to the external control device 50.
- the controller 10 generates an alarm message indicating that the insulation of the high voltage battery 40 is destroyed when the resistance value of the insulation resistance RL determined in step P130 is smaller than a preset reference value. It can be output to the external control device 50 through the communication interface.
- the external control device 50 may express the alarm message visually through the display or acoustically through the speaker.
- various control logics of the controller 10 may be combined with at least one, and the combined control logics may be written in a computer readable code system and stored in a computer readable recording medium.
- the recording medium is not particularly limited as long as it is accessible by a processor included in the computer.
- the recording medium includes at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device.
- code system may be distributed and stored and executed in a networked computer.
- functional programs, code and code segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.
- the controller 10 may optionally include a processor, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, registers, communication modems, data processing devices, etc., known in the art to execute the various control logics disclosed. Can be.
- ASIC application-specific integrated circuit
- the control unit 10 may be implemented as a set of program modules.
- the program module may be stored in a memory and executed by a processor.
- the memory may be internal or external to the processor and may be coupled to the processor by a variety of known means.
- each component may be selectively integrated with other components or each component may be divided into subcomponents for efficient execution of control logic (s).
- control logic control logic
- the integrated or divided components should also be interpreted as being within the scope of the present invention, provided that the functional identity can be recognized even if the components are integrated or divided.
- the insulation resistance can be measured by using an operational amplifier (OP-amp), the insulation resistance can be accurately measured without being influenced by external influences.
- OP-amp operational amplifier
- the insulation resistance may be measured by connecting to the negative terminal of the high voltage battery. Therefore, since expensive circuit components having excellent withstand voltage characteristics are not required, insulation resistance can be measured more simply at minimum cost.
- the insulation resistance can be measured accurately.
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Abstract
Description
Claims (17)
- 배터리의 절연저항을 측정하는 장치로서,일단이 상기 배터리의 음극 단자와 전기적으로 연결된 파라미터 저항;상기 파라미터 저항에 흐르는 배터리의 누출전류의 적어도 일부 전류가 흐를 수 있도록 상기 파라미터 저항과 연결 가능한 션트 저항과, 상기 션트 저항의 양쪽 단자와 연결되어 상기 션트 저항의 양단 전압을 검출하여 출력하는 연산 증폭기를 포함하는 전류검출회로; 및상기 파라미터 저항과 상기 션트 저항 사이에 연결된 스위치를 온 또는 오프 상태로 제어하는 스위치 제어단자와, 상기 션트 저항에 제1 하이 전압 신호와 제1 로우 전압 신호를 선택적으로 인가하는 검출 신호 출력단과, 상기 연산 증폭기에 조정 전압 신호를 인가하여 상기 연산 증폭기의 출력 전압을 미리 설정된 범위 내로 조절하는 조정 신호 출력단과, 상기 연산 증폭기의 출력단과 연결된 ADC와, 상기 션트 저항에 제1 하이 전압 신호와 제1 로우 전압 신호가 인가되었을 때 상기 ADC를 통해 측정되는 상기 연산 증폭기의 출력 전압에 대한 제1 전압 변화량을 파라미터로서 포함하고 있는 미리 정의된 절연저항 계산식을 이용하여 상기 배터리의 절연저항을 결정하는 제어부;를 포함하는 것을 특징으로 하는 절연저항측정장치
- 제1항에 있어서,상기 조정 신호 출력단은 제2 하이 전압 신호와 제2 로우 전압 신호를 선택적으로 출력하는 제1 및 제2조정 신호 출력단을 포함하고,상기 전류검출회로는, 상기 제1 및 제2 조정 신호 출력단과 각각 연결된 제1 및 제2 조정 저항을 포함하고,상기 제1 및 제2 조정 저항은 상호 병렬 연결되고 일단이 상기 연산 증폭기의 반전 단자에 연결된 것을 특징으로 하는 절연저항측정장치.
- 제2항에 있어서, 상기 전류검출회로는, 상기 션트 저항의 일단을 상기 연산 증폭기의 비반전 단자에 연결하는 제1 연결 저항과, 상기 션트 저항의 타단을 상기 연산 증폭기의 반전 단자에 연결하는 제2 연결 저항을 더 포함하는 것을 특징으로 하는 절연저항측정장치.
- 제2항에 있어서, 상기 제어부는,상기 스위치를 온 상태로 제어한 상태에서, 상기 검출 신호 출력단을 통해 시간 간격을 두고 상기 션트 저항에 제1 하이 전압 신호와 제1 로우 전압 신호를 인가하도록 구성되고,상기 션트 저항에 상기 제1 하이 전압 신호와 상기 제1 로우 전압 신호가 인가될 때, 상기 연산 증폭기의 출력 전압에 대한 제1 전압 변화량을 ADC를 통해 측정하도록 구성된 것을 특징으로 하는 절연저항측정장치.
- 제4항에 있어서, 상기 제어부는,상기 스위치를 오프 상태로 제어한 상태에서, 상기 검출 신호 출력단을 통해 시간 간격을 두고 상기 션트 저항에 제3 하이 전압 신호와 제3 로우 전압 신호를 인가하도록 구성되고,상기 션트 저항에 상기 제3 하이 전압 신호와 상기 제3 로우 전압이 인가될 때 상기 ADC를 통해 측정되는 상기 연산 증폭기의 출력 전압에 대한 제2 전압 변화량을 결정하도록 구성되고,상기 제1 전압 변화량과 상기 제2 전압 변화량의 차이에 해당하는 제3 전압 변화량을 결정하도록 구성되고,상기 제3 전압 변화량을 파라미터로서 포함하고 있는 미리 정의된 절연저항 계산식을 이용하여 상기 배터리의 절연저항을 결정하도록 구성된 것을 특징으로 하는 절연저항측정장치.
- 제4항 또는 제5항에 있어서, 상기 제어부는,상기 ADC를 통해 측정되는 상기 연산 증폭기의 출력 전압이 상기 ADC의 미리 설정된 동작 전압 범위에 속하지 않으면, 상기 출력 전압이 상기 미리 설정된 동작 전압 범위에 속할 때까지 상기 제1 및 제2 조정 신호 출력단을 통해 상기 제1 조정 저항 및 상기 제2 조정 저항에 제2 하이 전압 신호 또는 제2 로우 전압 신호를 선택적으로 인가하도록 구성된 것을 특징으로 하는 절연저항측정장치.
- 제2항에 있어서,상기 제어부는, 상기 제1 및 제2 조정 신호 출력단을 통해 상기 제1 조정 저항 및 상기 제2 조정 저항에 제2 하이 전압 신호 또는 제2 로우 전압 신호를 선택적으로 인가하도록 구성된 것을 특징으로 하는 절연저항측정장치.
- 제4항 또는 제5항에 있어서, 상기 미리 정의된 절연저항 계산식은,상기 검출 신호 출력단을 통해 상기 션트 저항에 하이 전압 신호와 로우 전압 신호가 인가될 때, 상기 제1 및 제2 조정 신호 출력단을 통해 출력되는 전압 신호의 레벨에 따라 제1 조정 저항 및 제2 조정 저항의 등가 저항에 인가되는 조정 전압 변화량을 파라미터로서 더 포함하고 있는 것을 특징으로 하는 절연저항측정장치.
- 제1항에 있어서,상기 절연저항의 저항 값이 저장되는 메모리부를 더 포함하는 것을 특징으로 하는 절연저항측정장치.
- 제1항에 있어서,상기 제어부는 상기 절연저항의 저항 값을 외부의 제어장치로 출력하도록 구성된 것을 특징으로 하는 절연저항측정장치.
- 배터리의 음극 단자와 연결된 파라미터 저항, 션트 저항, 상기 파라미터 저항과 상기 션트 저항 사이에 설치된 스위치, 상기 션트 저항의 양쪽 단자와 연결된 연산 증폭기 및 상기 연산 증폭기의 출력 전압을 조정할 수 있도록 상기 연산 증폭기의 입력 단자들 중 적어도 하나와 결합된 조정 저항을 이용하여 배터리의 절연저항을 결정하는 방법에 있어서,(a) 상기 스위치를 온 상태로 제어하는 단계;(b) 상기 션트 저항에 시간 간격을 두고 제1 하이 전압 신호와 제1 로우 전압 신호를 인가했을 때 상기 연산 증폭기의 출력 전압을 측정하는 단계;(c) 상기 조정 저항의 일단에 조정 전압 신호를 인가하여 상기 연산 증폭기의 출력 전압을 미리 설정된 범위 내에 포함되도록 조정하는 단계;(d) 상기 연산 증폭기의 출력 전압에 대한 제1 전압 변화량을 결정하는 단계; 및(e) 상기 제1 전압 변화량을 파라미터로서 포함하고 있는 미리 정의된 절연저항 계산식을 이용하여 상기 배터리의 절연저항을 결정하는 단계;를 포함하는 것을 특징으로 하는 절연저항측정방법.
- 제11항에 있어서,상기 스위치를 오프 상태로 제어하는 단계;상기 검출 신호 출력단을 통해 시간 간격을 두고 상기 션트 저항에 제3 하이 전압 신호와 제3 로우 전압 신호를 인가하는 단계;상기 제3 하이 전압 신호와 상기 제3 로우 전압 신호를 인가했을 때 상기 연산 증폭기의 출력 전압을 측정하는 단계;상기 조정 저항의 일단에 조정 전압 신호를 인가하여 상기 연산 증폭기의 출력 전압을 미리 설정된 범위 내에 포함되도록 조정하는 단계;상기 연산 증폭기의 출력 전압에 대한 제2 전압 변화량을 결정하는 단계;상기 제1 전압 변화량과 상기 제2 전압 변화량의 차이에 해당하는 제3 전압 변화량을 결정하는 단계; 및상기 제3 전압 변화량을 파라미터로서 포함하고 있는 미리 정의된 절연저항 계산식을 이용하여 상기 배터리의 절연저항을 결정하는 단계를 더 포함하는 것을 특징으로 하는 절연저항측정방법.
- 제11항 또는 제12항에 있어서,상기 조정 저항은 적어도 병렬로 연결된 2개의 조정 저항을 포함하고,각 조정 저항의 일단은 상기 연산 증폭기의 반전 단자에 연결되고,상기 연산 증폭기의 출력 전압이 미리 설정된 범위 내에 포함되도록 각 조정 저항에 제2 하이 전압 신호 또는 제2 로우 전압 신호를 선택적으로 인가하는 단계를 더 포함하는 것을 특징으로 하는 절연저항측정방법.
- 제13항에 있어서,상기 연산 증폭기의 출력 전압이 미리 설정된 전압 범위에 속하지 않으면, 상기 연상 증폭기의 출력 전압이 상기 미리 설정된 전압 범위에 속할 때까지 각 조정 저항에 제2 하이 전압 신호 또는 제2 로우 전압 신호를 선택적으로 인가하는 단계를 더 포함하는 것을 특징으로 하는 절연저항측정방법.
- 제11항 또는 제12항에 있어서, 상기 미리 정의된 절연저항 계산식은,상기 션트 저항에 하이 전압 신호가 인가될 때와 로우 전압 신호가 인가될 때를 기준으로, 조정 저항에 인가되는 조정 전압 변화량을 파라미터로서 더 포함하고 있는 것을 특징으로 하는 절연저항측정방법.
- 제11항 또는 제12항에 있어서,메모리부에 상기 절연저항의 저항 값을 저장하는 단계;를 더 포함하는 것을 특징으로 하는 절연저항측정방법.
- 제11항 또는 제12항에 있어서,상기 절연저항의 저항 값을 외부의 제어장치로 출력하는 단계;를 더 포함하는 것을 특징으로 하는 절연저항측정방법.
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EP16762007.9A EP3232209B1 (en) | 2015-03-10 | 2016-03-10 | Insulation resistance measuring device and method |
CN201680004429.5A CN107110900B (zh) | 2015-03-10 | 2016-03-10 | 绝缘电阻测量装置和方法 |
JP2017554233A JP6505867B2 (ja) | 2015-03-10 | 2016-03-10 | 絶縁抵抗測定装置及び方法 |
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