KR101475914B1 - Apparatus for measuring isolation resistance having malfunction self-diagnosing and method thereof - Google Patents

Abstract

The present invention discloses an insulation resistance measuring apparatus and method having a function capable of self diagnosis of failure. The apparatus for measuring insulation resistance provided with a self-diagnosis function according to the present invention comprises: a first insulation measurement resistance part and a second insulation measurement resistance part connected to a positive terminal and a negative terminal of a battery, respectively; A first diagnostic resistance section and a second diagnostic resistance section respectively connected to the first insulation measurement resistance section and the second insulation measurement resistance section; A first switch and a second switch for connecting the first insulation measurement resistance portion and the second insulation measurement resistance portion to the positive electrode terminal and the negative electrode terminal, respectively; A third switch and a fourth switch for connecting the first diagnostic resistance section and the second diagnostic resistance section to the first insulation measurement resistance section and the second insulation measurement resistance section, respectively; A voltage detection unit sensing the first and second fault diagnosis voltages through the first and second insulation resistance measurement units; And outputting a control signal to the third and fourth switches to form a failure diagnostic circuit, and when the failure diagnosis circuit is formed from the voltage detection unit, the first and second failure diagnostic voltages And a controller for determining whether or not a failure has occurred. According to the present invention, it is possible to diagnose whether or not a device for measuring the insulation resistance of the battery has failed.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an insulation resistance measuring apparatus having a self-diagnosis function, and a self-diagnosis method using the same. [0002]

The present invention relates to an apparatus and method for measuring insulation resistance having a self-diagnosis function, and more particularly, to an apparatus and method for measuring insulation resistance of a battery used in a battery power supply system requiring high voltage And more particularly,

In recent years, due to exhaustion of fossil energy and environmental pollution, there is a growing interest in electric products that can be driven by electric energy without using fossil energy.

Accordingly, as technology development and demand for mobile devices, electric vehicles, hybrid vehicles, power storage devices, uninterruptible power supply devices, and the like are increasing, the demand for secondary batteries as energy sources is rapidly increasing and demand forms are also diversifying. Accordingly, a lot of research is being conducted on a battery composed of a secondary battery so as to meet various demands.

Particularly, in an apparatus such as an electric car or a hybrid vehicle using a high output, large capacity battery, it is necessary that the insulation state between the battery and the device is well maintained. If the insulated state of the battery is not maintained, leakage current is generated and causes various problems. For reference, the leakage current causes unexpected discharge of the battery or malfunction of the electronic equipments provided in the apparatus. Also, devices that use high-voltage batteries, such as electric cars, can cause fatal shocks to people. Therefore, in order to solve the problem caused by the leakage current as described above, various insulation resistance measuring devices have been developed and used to determine whether the insulation state of the secondary battery is well maintained by calculating the insulation resistance of the secondary battery.

On the other hand, if a failure occurs in the insulation resistance measuring device and the calculation of the insulation resistance value is not accurately performed, the effect of the use of the device is halved, so that the above-mentioned various problems caused by the leakage current can not be solved. Particularly, if a failure occurs in the resistance element included in the apparatus for measuring the insulation resistance, or if a failure occurs in the switching element included in the apparatus for measuring the insulation resistance and the switching control in the ON or OFF state is not properly performed, The resistance value can not be measured and the measured insulation resistance value is unreliable. Therefore, there is a need for an apparatus and method that can diagnose the failure of the insulation resistance measuring apparatus.

It is an object of the present invention to provide a fault diagnosis apparatus and method for an insulation resistance measuring apparatus having a fault diagnosis function.

According to an aspect of the present invention, there is provided an apparatus for measuring an insulation resistance with a self-diagnosis function, the apparatus comprising: a first insulation measurement resistance unit and a second insulation measurement resistance unit connected to a positive terminal and a negative terminal of the battery, respectively; A first diagnostic resistance section and a second diagnostic resistance section respectively connected to the first insulation measurement resistance section and the second insulation measurement resistance section; A first switch and a second switch for connecting the first insulation measurement resistance portion and the second insulation measurement resistance portion to the positive electrode terminal and the negative electrode terminal, respectively; A third switch and a fourth switch for connecting the first diagnostic resistance section and the second diagnostic resistance section to the first insulation measurement resistance section and the second insulation measurement resistance section, respectively; A voltage detection unit sensing the first and second fault diagnosis voltages through the first and second insulation resistance measurement units; And outputting a control signal to the third and fourth switches to form a failure diagnostic circuit, and when the failure diagnostic circuit is formed from the voltage detection unit, the first and second failure diagnostic voltages And a controller for determining whether or not a failure has occurred.

Preferably, the second insulation resistance measurement unit and the first diagnosis resistance unit each include a DC power supply unit for supplying a preset V _DC voltage.

이외의 값이면, 상기 제1 절연 측정 저항부에 고장이 발생한 것으로 판단한다. 또한, 상기 제어부는 제4 스위치가 온 동작을 하도록 제어하고 획득한 제2 고장 진단 전압이

이외의 값이면, 상기 제2 절연 측정 저항부에 고장이 발생한 것으로 판단한다.According to an embodiment of the present invention, the controller controls the third switch to turn on, and the first fault diagnostic voltage

It is determined that a failure has occurred in the first insulation resistance measurement unit. In addition, the control unit controls the fourth switch to turn on, and the obtained second fault diagnosis voltage

It is determined that a failure has occurred in the second insulation resistance measurement unit.

을 기준으로 미리 설정된 오차 범위를 벗어난 경우, 상기 제1 절연 측정 저항부에 고장이 발생한 것으로 판단한다. 또한, 상기 제어부는 제4 스위치가 온 동작을 하도록 제어하고 획득한 제2 고장 진단 전압이

을 기준으로 미리 설정된 오차 범위를 벗어난 경우, 상기 제2 절연 측정 저항부에 고장이 발생한 것으로 판단한다.According to another embodiment of the present invention, the controller controls the third switch to turn on,

It is determined that a failure has occurred in the first insulation resistance measurement unit. In addition, the control unit controls the fourth switch to turn on, and the obtained second fault diagnosis voltage

It is determined that a failure has occurred in the second insulation resistance measurement unit.

The controller controls the third switch to turn on and controls the third switch to determine that the third switch is in an open state if the first fault diagnosis voltage obtained is 0 V and controls the third switch to turn off And determines that the third switch is a short-circuit failure if the first failure diagnosis voltage obtained is a voltage other than 0V. Also, the controller controls the fourth switch to be turned on, and when the second fault diagnosis voltage obtained is V _DC , the fourth switch is determined as an open state failure and the fourth switch is controlled to be turned off, If the second fault diagnosis voltage is a voltage other than V _DC , the fourth switch is judged as a short-circuit fault.

The control unit according to the present invention may further include: a switch controller for outputting a signal for controlling ON / OFF operations of the first to fourth switches; An A / D converter for converting an analog voltage signal output from the voltage detector into a digital voltage signal; And a central arithmetic processor for receiving the digital voltage signal from the A / D converter and determining whether the first and second insulation resistance measurement units and the third and fourth switches are faulty.

The insulation resistance measuring apparatus having a self-diagnosing function according to the present invention may further include a transmission unit forming a communication interface with an external device, wherein the control unit controls the first and second insulation resistance measurement units And information on whether or not a fault has occurred in the third and fourth switches can be transmitted to the external device through the transmission unit. The external device may be a battery analyzer or a control device of a system equipped with a battery.

The insulation resistance measuring apparatus having a self-diagnosing function according to the present invention may further include a warning unit for outputting a visual or auditory warning signal, wherein the control unit controls the first and second insulation measuring resistors And when a failure occurs in any one of the third and fourth switches, a visual or auditory warning signal can be output through the warning unit.

According to an aspect of the present invention, there is provided a method of automatically diagnosing an insulation resistance of an insulation resistance measuring apparatus, including: first and second insulation resistance measurement units connected respectively to first and second insulation resistance measurement units, A method of self-diagnosing a failure of an insulation resistance measuring apparatus using a third switch and a fourth switch for connecting the diagnostic resistance unit and the first and second diagnostic resistance units to the first and second insulation resistance measurement units, (a) outputting an on / off control signal to the third or fourth switch; (b) receiving the first and second fault diagnosis voltages detected through the first and second insulation resistance measurement units; And (c) determining whether the first and second insulation measurement resistors and the third and fourth switches are faulty using the first and second fault diagnosis voltages.

According to an aspect of the present invention, it is possible to diagnose whether or not an apparatus for measuring insulation resistance of a battery has failed.

According to another aspect of the present invention, it is possible to diagnose the failure by using the original configuration of the device for measuring the insulation resistance of the battery.

According to another aspect of the present invention, a user or an external device is informed of a failure occurrence so that a user can take action.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
FIG. 1 is a circuit diagram schematically showing an equivalent circuit of a battery power supply system to which an insulation resistance measuring apparatus having a fault self-diagnosis function according to an embodiment of the present invention is connected.
2 is a circuit diagram schematically illustrating an equivalent circuit of an insulation resistance measuring apparatus having a self-diagnosis function according to an embodiment of the present invention.
3 is a circuit diagram schematically showing the first circuit.
4 is a circuit diagram schematically showing the second circuit.
5 is a circuit diagram schematically showing a failure diagnosis circuit of the first insulation measuring resistance portion.
6 is a circuit diagram schematically showing a failure diagnosis circuit of the second insulation measuring resistance portion.
7 is a block diagram showing the configuration of a control unit according to an embodiment of the present invention.
8 is a flowchart showing a flow of a fault diagnosis method of an insulation resistance measuring apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a circuit diagram schematically showing an equivalent circuit of a battery power supply system to which an insulation resistance measuring apparatus 100 having a fault diagnosis self-diagnosis function according to an embodiment of the present invention is connected.

As shown in FIG. 1, an insulation resistance measuring apparatus 100 having a self-diagnosis function according to the present invention includes a battery 10 in which a plurality of cells are connected in series and / or in parallel to form a cell assembly, Is connected between the positive and negative terminals of the battery (10) in a battery power supply system constituted by a load (20) supplied with power output from the battery (10).

The battery 10 has a structure in which a plurality of unit cells capable of being recharged by electrical energy storage means are electrically connected. The unit cell is an electric double layer capacitor including an ultracapacitor or a secondary battery such as a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydride battery, a nickel zinc battery and the like. For example, when the battery 10 is a battery used in an electric vehicle or a hybrid vehicle, the battery 10 outputs a high voltage DC power of 200 V or more. However, the present invention is not limited by the type of battery, the output voltage, the charging capacity, and the like.

The load 20 may be constituted by an electric motor or a drive motor M of a hybrid vehicle, a DC to DC converter (not shown) or the like. The DC / DC cap C1 and the Y-caps C2 and C3 may be included in the load 20 to remove noise generated in the drive motor M. The DC / DC cap C1 employs a capacitor having a large capacity to eliminate high frequency noises generated in the drive motor M. The Y-caps C2 and C3 remove low frequency noises generated in the drive motor M. do.

The insulation resistance measuring apparatus 100 having the self-diagnosis function according to the present invention is connected between the positive and negative terminals of the battery 10 to measure the insulation resistance of the battery 10 and perform self-diagnosis. Before describing the failure diagnosis algorithm of the insulation resistance measurement apparatus 100 having the self-diagnosis function according to the present invention, the insulation resistance measurement algorithm of the insulation resistance measurement apparatus 100 having the self- Will be briefly described below with reference to Fig.

2 is a circuit diagram schematically showing an equivalent circuit of an insulation resistance measuring apparatus 100 having a self-diagnosis function according to the present invention.

Referring to FIG. 2, an insulation resistance measuring apparatus 100 having a self-diagnosis function according to the present invention includes a first insulation resistance measuring unit 110, a second insulation measuring resistance unit 120, unit _{(R diag (+)),} a second diagnostic resistor portion _{(R diag (-)),} the first switch (SW1), second switch (SW2), the third switch (SW3), the fourth switch (SW4), A voltage detector 130 and a controller 140.

The first switch SW1 selectively connects the first insulation measurement resistance portion 110 to the positive terminal of the battery 10. The first switch SW1 is turned on and off by a control signal of the controller 140. [ Therefore, the first insulation measurement resistance part 110 is selectively connected to the positive terminal of the battery 10 by the control signal of the controller 140. In this specification, a circuit formed by connecting the first insulation measurement resistance portion 110 to the positive terminal of the battery 10 is referred to as a first circuit in order to facilitate understanding of the invention. When the first circuit is formed, the voltage on the positive terminal side of the battery is applied to the first insulation measurement resistance portion 110.

The second switch SW2 selectively connects the second insulation measurement resistance portion 120 to the negative terminal of the battery 10. The second switch SW2 is turned on and off by a control signal of the controller 140. [ Therefore, the second insulation measurement resistance part 120 is selectively connected to the negative terminal of the battery 10 by the control signal of the controller 140. In this specification, a circuit formed by connecting the second insulation measurement resistance portion 120 to the negative terminal of the battery 10 is referred to as a second circuit in order to facilitate understanding of the invention. When the second circuit is formed, the voltage on the negative terminal side of the battery is applied to the second insulation measurement resistance portion 120.

Preferably, the second insulation measurement resistance part 120 further includes a DC power application part DC. This allows the voltage detector 130 to sense a voltage value other than 0 by applying a positive voltage to the second insulation resistance measuring unit 120 when the second circuit is formed.

Preferably, the first and second insulation measurement resistance sections 110 and 120 include a plurality of resistance elements. The range of the voltage applied to each resistance element can be set by the battery 10 by arbitrarily selecting the resistance value for the plurality of resistance elements. It is an embodiment that the value of the resistance element is appropriately selected and the range of the voltage to be sensed by the voltage detector 130 is 5 V or less.

Although FIG. 2 shows an embodiment in which the first and second insulation measurement resistors 110 and 120 are composed of the first and second resistors R ₁ and R ₂ , the present invention is not limited thereto. Do not. In addition, the embodiment shown in FIG. 2 helps the understanding of the present invention, and in order to simplify the drawing, the first and second insulation measurement resistance portions 110 and 120 are formed of first and second resistors R ₁ and R ₂ ). ≪ / RTI > It is apparent to those skilled in the art that the number of resistance elements, the resistance value of each resistance element, and the like can be variously set.

The voltage detection unit 130 senses an insulation detection voltage applied to the first and second insulation resistance measurement units 110 and 120. The insulation detection voltage is a voltage applied to the second resistor (R ₂ ). The insulation detection voltage is used to calculate the insulation resistance value of the battery 10. In this specification, when a first circuit is formed, a voltage applied to a second resistor R ₂ included in the first insulation resistance measuring unit 110 is referred to as a first insulation detection voltage V ₁ . When the second circuit is formed, the voltage applied to the second resistor R ₂ included in the second insulation resistance measuring unit 120 is referred to as a second insulation detection voltage V ₂ . The voltage detector 130 outputs a signal corresponding to the first and second insulation detection voltages V ₁ and V ₂ to the controller 140.

The control unit 140 outputs a signal for controlling the ON and OFF operations of the first and second switches SW1 and SW2. When the control unit 140 controls the first switch SW1 to turn on, the second switch SW2 is controlled to maintain the off state. On the other hand, when the control unit 140 controls the second switch SW2 to turn on, the first switch SW1 is controlled to maintain the off state. Accordingly, the controller 140 connects the first and second insulation resistance measurement units 120 to the positive and negative terminals of the battery 10 at different points in time. The first and second switches SW1 and SW2 are merely naming for each other and mean the order in which the control unit 140 outputs a control signal, It does not indicate the order of operations.

The controller 140 receives signals corresponding to the first and second insulation detection voltages V ₁ and V ₂ received from the voltage detector 130. Then, the controller 140 calculates the positive terminal side insulation resistance R _{Leak (+)} from the first and second insulation detection voltages V ₁ and V ₂ and the combination circuit equation derived from the first and second circuits, Value and the negative terminal side insulation resistance (R _{Leak (-)} ). An algorithm for calculating the insulation resistance value through the simultaneous circuit equations will be described in detail below.

On the other hand, the voltage of the battery 10 is represented by V _Bat , and the positive terminal side insulation resistance R _{Leak (+} ) and the negative terminal side insulation resistance R _{Leak (-)} represents an imaginary resistance value indicating the insulation state of the battery 10. Therefore, when the insulation state of the battery 10 is broken, the values of the anode terminal side insulation resistance R _{Leak (+)} and the anode terminal side insulation resistance R _{Leak (-)} will be low, It can be interpreted that a current is generated. The diagnosis diagnostic algorithm is described below with respect to the first diagnosis resistance section R _{diag (+)} , the second diagnosis resistance section R _{diag (-} ), the third switch SW3 and the fourth switch SW4. I will explain it in detail.

Referring to FIGS. 3 and 4, the insulation resistance measuring apparatus 100 having the self-diagnosis function according to the present invention calculates the insulation resistance R _{Leak (+)} of the positive electrode terminal and the insulation resistance R _{Leak (-)} ) value of a given value.

3 is a circuit diagram schematically showing the first circuit.

3, a current flowing in the first insulation measurement resistance portion 110 is denoted by I ₁ , a current flowing in the insulation resistor R _{Leak (+)} on the anode terminal side is _denoted by I ₂ , The current flowing through the resistor (R _{Leak (-)} ) is indicated by I ₃ .

First, a value for the first insulation detection voltage (V ₁ ) is represented by I ₁ , and is expressed by the following equation (1).

Since the first insulation measurement resistance portion 110 and the anode terminal side insulation resistance R _{Leak (+)} are in a parallel relationship, the following relationship is established as shown in Equation (2).

On the other hand, applying the Kirchhoff's current law with respect to the node n connected to the ground leads to the following equation (3).

If Equations (1) and (2) are substituted into Equation (3) and summarized for I ₃ , Equation (3) can be expressed as Equation (4) below.

On the other hand, when Kirchhoff's voltage law is applied based on Mesh 1 shown in FIG. 3, an equation of the first row included in Equation (5) is derived. If the equation of the first row is summarized using I ₂ and I ₃ obtained from the equations (1) to (4), the equation of the last row included in the following equation (5) can be derived.

Equations of the last row contained in the equation (5) is the positive terminal side of the insulation resistance _{(R Leak (+))} values and the negative electrode terminal side insulation resistance _{(R Leak (-))} as one of the simultaneous circuit equation for calculating the value Will be used with the remaining circuit equations to be described below.

4 is a circuit diagram schematically showing the second circuit.

4, a current flowing in the second insulation measurement resistance part 120 is denoted by I ₁ , a current flowing in the negative terminal side insulation resistance R _{Leak (-)} is _denoted by I ₂ , (R _{Leak (+)} ) is indicated by I ₃ .

First, the value for the second insulation detection voltage (V ₂ ) is represented by I ₁ , which is expressed by Equation (6) below.

Since the second insulation measurement resistance portion 120 and the negative terminal side insulation resistance R _{Leak (-)} are in a parallel relationship, the following relationship is established as shown in Equation (7).

On the other hand, applying Kirchhoff's current law with respect to node n connected to ground, the following equation (8) is derived.

If Equations (6) and (7) are substituted for Equation (8) and summarized for I ₃ , Equation (8) can be expressed as Equation (9) below.

On the other hand, if Kirchhoff's voltage law is applied based on Mesh 2 shown in FIG. 4, the first row equation included in Equation (10) is derived. If the equation of the first row is summarized using I ₂ and I ₃ obtained from the equations (6) to (9), the equation of the last row included in the following equation (10) can be derived.

Equations of the last row contained in the equation (10) is the positive terminal side of the insulation resistance _{(R Leak (+))} values and the negative electrode terminal side insulation resistance _{(R Leak (-))} the rest of the circuit of simultaneous circuit equation for calculating the value It is an equation. Thus, the equation (5) by simultaneous equations of the last row contained in equations and the equation (10) of the last row contained in the positive electrode terminal side of the insulation resistance _{(R Leak (+))} and negative terminal side insulation resistance (R _{Leak ( -)} ), the following equation (11) can be obtained.

In Equation (11), the voltage value (V _Bat ) of the battery, the resistance values of the first and second resistors (R ₁ and R ₂ ), and the voltage value (V _DC ) The second insulation detection voltages V ₁ and V ₂ can be obtained through the voltage detector 130. Accordingly, the controller 140 substitutes the first and second insulation detection voltages V ₁ and V ₂ received from the voltage detector 130 into Equation (11) to determine the insulation resistance of the positive terminal of the battery 10 (R _{Leak (+)} ) and the negative terminal side insulation resistance (R _{Leak (-)} ) can be quantitatively calculated.

When the value of the insulation resistance (R _{Leak (+)} ) of the positive electrode terminal and the insulation resistance (R _{Leak (-)} ) of the negative electrode terminal of the battery 10 are calculated as described above, .

As described above, after the outline of the insulation resistance measurement apparatus 100 having the self-diagnosis function of faults, which is the target of the switch failure diagnosis of the present invention, the controller of the insulation resistance measurement apparatus having the self- The diagnostic algorithm will be described. First, an algorithm for diagnosing the failure of the first insulation measurement resistance unit 110 and the third switch SW3 will be described.

5 is a circuit diagram schematically showing a failure diagnosis circuit of the first insulation resistance measuring unit 110. As shown in FIG.

5, the failure diagnosis circuit of the first insulation measurement resistance unit 110 is formed when the first diagnostic resistance unit R _{diag (+} ) is connected to the first insulation measurement resistance unit 110.

Preferably, the first diagnostic resistance section (R _{diag (+)} ) further includes a DC power applying section (DC) supplying a preset V _DC voltage. This is to supply power to the first insulation resistance measuring unit 110 when diagnosing whether the first insulation measuring resistance unit 110 is faulty or not.

The third switch SW3 connects the first diagnostic resistance section R _{diag (+} ) to the first insulation measurement resistance section 110. The third switch SW3 is turned on and off by the control signal of the controller 140. [ Therefore, the first diagnostic resistance section R _{diag (+)} is connected to the first insulation measurement resistance section 110 by a control signal of the control section 140. In order to facilitate understanding of the present invention, a circuit formed by connecting the first diagnostic resistance section R _{diag (+)} to the first insulation measurement resistance section 110 is referred to as a failure of the first insulation measurement resistance section 110 Diagnostic circuit. When the failure diagnosis circuit of the first insulation resistance measuring unit 110 is formed, the voltage V _DC of the DC power applying unit is applied to the first insulation measuring resistance unit 110.

The voltage detection unit 130 senses a fault diagnosis voltage applied to the first insulation resistance measurement unit 110. The fault diagnosis voltage is a voltage applied to the second resistor R ₂ like the above-described insulation detection voltage. The fault diagnosis voltage is used to diagnose whether the first insulation resistance measuring unit 110 and the third switch SW3 are faulty. The voltage applied to the second resistor R ₂ included in the first insulation resistance measuring unit 110 is referred to as a first fault resistance R ₂ when the failure diagnosis circuit of the first insulation resistance measuring unit 110 is formed, It is called the diagnostic voltage (V _diag1 ). The voltage detector 130 outputs a signal corresponding to the first failure diagnosis voltage V _diag1 to the controller 140 side.

The controller 140 controls the switch-on / off operation of the third switch SW3. The controller 140 controls the third switch SW3 to be turned on to form a fault diagnosis circuit of the first insulation measurement resistance unit 110 and then the first fault diagnosis voltage (V _diag1 ).

전압이 상기 전압 검출부(130)에 의해 검출될 것이다. 여기서 R_total1은 제1 절연 측정 저항부(110)내에 포함된 저항 소자(R₁, R₂)의 저항값과 제1 진단 저항부(R_diag(+))의 저항값의 총 합을 의미한다. 그러나, 상기 제1 절연 측정 저항부(110)내에 포함된 저항 소자들 중 적어도 어느 하나가 파손, 단락, 절연 파괴 등 고장이 발생한 경우, 상기 전압 검출부(130)로부터 획득한 제1 고장 진단 전압(V_diag1)이

이외의 값이 될 것이다. 이러한 경우, 상기 제어부(140)는 상기 제1 절연 측정 저항부(110)에 고장이 발생한 것으로 판단한다.At this time, if the state of the resistance elements included in the first insulation resistance measuring unit 110 is normal, the voltage V _DC of the DC power applying unit is applied to the second resistor R ₂

And the voltage will be detected by the voltage detecting unit 130. Here, R _total1 means the total sum of the resistance values of the resistance elements R ₁ and R ₂ included in the first insulation measurement resistance portion 110 and the resistance value of the first diagnosis resistance portion R _{diag (+)} . However, if at least one of the resistance elements included in the first insulation resistance measurement unit 110 has a failure such as breakage, short-circuit, insulation breakdown, or the like, the first failure diagnosis voltage V _diag1 )

It will be a value other than. In this case, the controller 140 determines that a failure has occurred in the first insulation resistance measuring unit 110. [

을 기준으로 미리 설정된 오차 범위를 벗어난 경우, 상기 제1 절연 측정 저항부(110)에 고장이 발생한 것으로 판단한다. 상기 제1 고장 진단 전압(V_diag1)을 검출하는 과정에서 발생할 수 있는 측정 오차, DC 전원 인가부의 전압값(V_DC) 오차, 수학식의 연산과정에서 소수점 이하의 유효값을 제외한 나머지 값의 삭제 등 실제 장치를 구현하면서 발생할 수 있는 오차로 인해 상기 고장 여부를 진단하기 전압값을 완벽히 만족하는 것은 어려울 수 있다. 따라서, 상술한 오차 가능성을 고려하여

전압값을 기준으로 미리 오차 범위를 설정하고, 상기 제1 고장 진단 전압(Vdiag1)이 상기 오차 범위를 벗어난 경우, 상기 제1 절연 측정 저항부(110)에 고장이 발생한 것으로 판단할 수 있다.According to another embodiment of the present invention, the controller 140 may determine that the first fault diagnostic voltage (V _diag1 )

It is determined that a failure has occurred in the first insulation resistance measuring unit 110. In this case, A measurement error that may occur in the process of detecting the first failure diagnosis voltage V _diag1 , a voltage value (V _DC ) error of the DC power application unit, a residual value excluding a valid value less than a decimal point in the calculation process of the equation It may be difficult to completely satisfy the voltage value for diagnosing the failure due to an error that may occur while realizing the actual device. Therefore, considering the above-described error possibility

It is possible to determine that a failure has occurred in the first insulation resistance measurement unit 110 when the first error diagnostic voltage Vdiag1 is out of the error range.

In addition, the controller 140 may determine whether the third switch SW3 is faulty through the first fault diagnosis voltage V _diag1 . When the failure diagnosis circuit of the first insulation resistance measurement unit 110 is formed, the voltage V _DC of the DC power supply unit is applied to the second resistor R ₂ included in the first insulation resistance measurement unit 110 And a voltage other than 0 V will be detected by the voltage detecting unit 130. However, if the first diagnostic voltage V _diag1 obtained from the voltage detector 130 is 0V, the controller 140 determines that the third switch SW3 is in the open state. In the present specification, the open-circuit failure means a case where the switch element does not normally perform the on-off operation by the control signal, and maintains the open state in which the current can not be conducted.

Conversely, when the controller 140 controls the third switch SW3 to turn off, the first insulation resistance measuring unit 110 is not connected to any power source. At this time, 0 V is detected by the voltage detector 130 in the second resistor R ₂ included in the first insulation resistance measuring unit 110. However, if the first fault diagnosis voltage V _diag1 obtained from the voltage detector 130 is a voltage other than 0V, the controller 140 determines that the third switch SW3 is in a short-circuited state. In the present specification, the short-circuit state failure means a case where the switch element does not normally perform the on-off operation by the control signal, and maintains the short state in which the electric current is conducted.

Next, an algorithm for diagnosing whether or not the second insulation resistance measuring unit 120 and the fourth switch SW4 are faulty will be described.

FIG. 6 is a circuit diagram schematically showing a failure diagnosis circuit of the second insulation resistance measuring unit 120. FIG.

6, the failure diagnosis circuit of the second insulation measurement resistance part 120 is formed when the second diagnostic resistance part R _{diag (-} ) is connected to the second insulation measurement resistance part 120.

The fourth switch SW4 connects the second diagnostic resistance section R _{diag (-} ) to the second insulation measurement resistance section 120. The fourth switch SW4 is turned on and off by a control signal of the controller 140. [ Therefore, the second diagnosis resistance R _{diag (-)} is connected to the second insulation measurement resistance part 120 by a control signal of the controller 140. In order to facilitate understanding of the present invention, a circuit formed by connecting the second diagnostic resistance section R _{diag (-)} to the second insulation measurement resistance section 120 is referred to as a failure of the second insulation measurement resistance section 120 Diagnostic circuit. When the failure diagnosis circuit of the second insulation resistance measurement unit 120 is formed, a closed circuit is formed with the DC power supply unit DC as a power supply source.

The voltage detection unit 130 senses a fault diagnosis voltage applied to the second insulation measurement resistance unit 120. The fault diagnosis voltage is a voltage applied to the second resistor R ₂ like the above-described insulation detection voltage. The fault diagnosis voltage is used to diagnose whether the second insulation resistance measuring unit 120 and the fourth switch SW4 are faulty. The voltage applied to the second resistor R ₂ included in the second insulation resistance measuring unit 120 is set to the second fault resistance R ₂ when the failure diagnosis circuit of the second insulation resistance measuring unit 120 is formed, It is called the diagnostic voltage (V _diag2 ). The voltage detector 130 outputs a signal corresponding to the second failure diagnosis voltage V _diag2 to the controller 140 side.

The controller 140 controls the switch on / off operation of the fourth switch SW4. The controller 140 controls the fourth switch SW4 to be turned on so that the second diagnosis diagnostic voltage is generated from the voltage detector 130 after the failure diagnosis circuit of the second insulation measurement resistance unit 120 is formed, (V _diag2 ).

전압이 상기 전압 검출부(130)에 의해 검출될 것이다. 여기서 R_total2은 제2 절연 측정 저항부(120)내에 포함된 저항 소자(R₁, R₂)의 저항값과 제2 진단 저항부(R_diag(-))의 저항값의 총 합을 의미한다. 그러나, 상기 제2 절연 측정 저항부(120)내에 포함된 저항 소자들 중 적어도 어느 하나가 파손, 단락, 절연 파괴 등 고장이 발생한 경우, 상기 전압 검출부(130)로부터 획득한 제2 고장 진단 전압(V_diag2)이

이외의 값이 될 것이다. 이러한 경우, 상기 제어부(140)는 상기 제2 절연 측정 저항부(120)에 고장이 발생한 것으로 판단한다.At this time, if the state of the resistance elements included in the second insulation resistance measuring unit 120 is normal, the voltage V _DC of the DC power applying unit is applied to the second resistor R ₂

And the voltage will be detected by the voltage detecting unit 130. Here, R _total2 means the total sum of the resistance values of the resistance elements R ₁ and R ₂ included in the second insulation measurement resistance portion 120 and the resistance value of the second diagnosis resistance portion R _{diag (-)} . However, if at least one of the resistance elements included in the second insulation resistance measurement unit 120 has a failure such as breakage, short-circuit, insulation breakdown, or the like, the second failure diagnosis voltage V _diag2 )

It will be a value other than. In this case, the controller 140 determines that a failure has occurred in the second insulation resistance measuring unit 120. [

을 기준으로 미리 설정된 오차 범위를 벗어난 경우, 상기 제2 절연 측정 저항부(120)에 고장이 발생한 것으로 판단한다. 상기 제2 고장 진단 전압(V_diag2)을 검출하는 과정에서 발생할 수 있는 측정 오차, DC 전원 인가부의 전압값(V_DC) 오차, 수학식의 연산과정에서 소수점 이하의 유효값을 제외한 나머지 값의 삭제 등 실제 장치를 구현하면서 발생할 수 있는 오차로 인해 상기 고장 여부를 진단하기 전압값을 완벽히 만족하는 것은 어려울 수 있다. 따라서, 상술한 오차 가능성을 고려하여

전압값을 기준으로 미리 오차 범위를 설정하고, 상기 제2 고장 진단 전압(Vdiag2)이 상기 오차 범위를 벗어난 경우, 상기 제2 절연 측정 저항부(120)에 고장이 발생한 것으로 판단할 수 있다.According to another embodiment of the present invention, the control unit 140 determines that the second fault diagnosis voltage (V _diag2 )

It is determined that a failure has occurred in the second insulation resistance measurement unit 120. In this case, A measurement error that may occur in the process of detecting the second failure diagnosis voltage V _diag2 , a voltage value (V _DC ) error of the DC power application unit, a residual value excluding a valid value less than the decimal point in the calculation process of the equation It may be difficult to completely satisfy the voltage value for diagnosing the failure due to an error that may occur while realizing the actual device. Therefore, considering the above-described error possibility

It is possible to determine that a failure has occurred in the second insulation resistance measurement unit 120 when the second error diagnosis voltage Vdiag2 is out of the error range.

In addition, the controller 140 may determine whether the fourth switch SW4 is faulty through the second fault diagnosis voltage V _diag2 . When the failure diagnosis circuit of the second insulation resistance measurement unit 120 is formed, the voltage V _DC of the DC power supply unit is applied to the second resistor R ₂ included in the second insulation resistance measurement unit 120 And a voltage other than V _DC will be detected by the voltage detecting unit 130. However, if the second fault diagnosis voltage V _diag2 obtained from the voltage detector 130 is V _DC , the controller 140 determines that the fourth switch SW4 is in the open state

Conversely, when the controller 140 controls the fourth switch SW4 to turn off, the second insulation resistance measuring unit 120 does not form a closed circuit. At this time, V _DC will be detected by the voltage detecting unit 130 in the second resistor R ₂ included in the second insulation resistance measuring unit 120. However, if the second fault diagnosis voltage V _diag2 obtained from the voltage detector 130 is a voltage other than V _DC , the controller 140 determines the fourth switch SW4 as a short-circuit fault.

The controller 140 may include a switch controller 143, an A / D converter 141, and a central operation processor 142 to execute the above-described failure diagnosis algorithm.

7 is a block diagram showing the configuration of the control unit 140 according to the embodiment of the present invention.

Referring to FIG. 7, the switch controller 143 outputs a switch control signal for controlling on / off operations of the first to fourth switches SW1, SW2, SW3, and SW4. The controller 140 receives the voltage measurement signal from the voltage detector 130. At this time, the A / D converter 141 converts the analog voltage signal output from the voltage detector 130 into a digital voltage signal. The central arithmetic processing unit 142 receives the digital voltage signal from the A / D converter 141 and receives the first and second insulation measurement resistors 110 and 120 and the third and fourth switches SW3 and SW4 ) Is faulty.

 The control unit 140 or the central processing unit 142 may be implemented as a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a register, and so on that are known in the art to execute the various control logic described above. A communication modem, a data processing device, and the like. Also, when the control logic described above is implemented in software, the control unit 140 or the central processing unit 142 may be implemented as a set of program modules. At this time, the program module is stored in the memory and can be executed by the processor. Here, the memory may be internal or external to the processor, and may be coupled to the processor by various well known means. A memory is a general term for a device in which information is stored regardless of the type of the device, and does not refer to a specific memory device.

According to another aspect of the present invention, an insulation resistance measuring apparatus 100 having a self-diagnosis function according to the present invention further includes a transmission unit 150 forming a communication interface with an external device. In this case, the controller 140 transmits information about whether or not the first and second insulation resistance measurement units 110 and 120 and the third and fourth switches SW3 and SW4 have failed, To the external device. The external device may be a battery analyzer or a control device of a system equipped with a battery.

According to another aspect of the present invention, the insulation resistance measuring apparatus 100 having the self-diagnosis function of the present invention may further include a warning unit 160 for outputting a visual or auditory warning signal. In this case, when a failure occurs in at least one of the first and second insulation measurement resistors 110 and 120 and the third and fourth switches SW3 and SW4, the controller 140 controls the warning unit 160 to output a visual or audible warning signal. The user can be warned of the occurrence of a failure of the first and second switches SW1 and SW2 included in the insulation resistance measuring apparatus 100 through the warning unit 160 in the event of a failure so that the user can take appropriate measures .

For example, the warning unit 160 may include an LED, an LCD, an alarm alarm, or a combination thereof. In this case, the warning unit 160 may blink an LED, output a warning message to the LCD, or generate an alarm buzzer sound to warn the user that a trouble has occurred. Also, the warning unit 160 may be included in an external device connected to the transmission unit 150. However, the present invention is not limited thereto. The LED, the LCD, and the alarm alarm are only examples of the warning unit 160, and it is obvious to those skilled in the art that various modified visual or auditory alarm devices can be employed as the warning unit 160 Do.

Hereinafter, a fault diagnosis method of the insulation resistance measuring apparatus corresponding to the operation mechanism of the apparatus will be described. However, the repetitive description of the configuration and the like of the insulation resistance measuring apparatus 100 having the self-diagnosis function described above will be omitted.

8 is a flowchart showing a flow of a fault diagnosis method of an insulation resistance measuring apparatus according to an embodiment of the present invention.

First, in step S410, the controller 140 outputs a switch control signal. This step is a step of controlling the third and fourth switches SW3 and SW4 to be turned on at different points in time. Since the control signal sent from the control unit 140 to each switch has already been described above, a repetitive description will be omitted.

In the next step S420, signals corresponding to the voltages applied to the respective second resistors R ₂ , that is, the signals corresponding to the first and second diagnostic voltages V _diag1 and V _diag2 , are received from the voltage detector 130 .

In step S430, the controller 140 determines whether the first and second insulation measurement resistors 110 and 120 are in the _{ON state} using the first and second diagnostic voltages V _diag1 and V _diag2 received in step S420. And the third and fourth switches SW3 and SW4 are faulty. The fault diagnosis method using the first and second fault diagnosis voltages (V _diag1 , V _diag2 ) has been described in detail, and a repetitive description thereof will be omitted.

Preferably, when at least one of the first and second insulation resistance measurement units 110 and 120 and the third and fourth switches SW3 and SW4 is failed (YES in step S430), the process proceeds to step S440 Information about whether a failure has occurred can be transmitted to the external device, or the process can proceed to step S450 to warn the user.

According to the present invention, it is possible to diagnose whether or not an apparatus for measuring an insulation resistance has failed. In addition, it is possible to diagnose the failure by using the inherent configuration of the apparatus for measuring the insulation resistance with diagnosis of the function of the faulty person. In addition, the user or external device is informed of the occurrence of a fault so that the user can take action.

In the meantime, in describing the present invention, each configuration of the insulation resistance measuring apparatus having the self-diagnosis function according to the present invention shown in FIGS. 1 to 8 is logically divided It should be understood as an element.

That is, since each configuration corresponds to a logical component for realizing the technical idea of the present invention, even if each component is integrated or separated, if the functions performed by the logical configuration of the present invention can be realized, And it is to be understood that any component that performs the same or similar function should be construed as being within the scope of the present invention irrespective of the consistency of the name.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

10: Battery 20: Load
100: insulation resistance measuring device 110: first insulation measuring resistance part
120: second insulation measurement resistance section 130: voltage detection section
140: control unit 141: A / D converter
142: central operation processor 143: switch controller
150: Transmission unit 160: Warning unit
DC: DC power applying part R ₁ : First resistance
R ₂ : second resistance R _{Leak (+)} : anode terminal side insulation resistance
R _{Leak (-)} : Negative terminal side insulation resistance SW1: First switch
SW2: second switch SW3: third switch
SW4: fourth switch V _1: a first insulating detected voltage
V ₂ : second insulation detection voltage V _diag 1: first fault diagnosis voltage
V _diag2 : Second fault diagnosis voltage V _DC : DC power supply negative voltage value

Claims (27)

A first insulation measurement resistance part and a second insulation measurement resistance part connected to the positive electrode terminal and the negative electrode terminal of the battery, respectively;
A first diagnostic resistance section and a second diagnostic resistance section respectively connected to the first insulation measurement resistance section and the second insulation measurement resistance section;
A first switch and a second switch for selectively connecting the first insulation measurement resistance portion and the second insulation measurement resistance portion to the positive electrode terminal and the negative electrode terminal, respectively;
A third switch and a fourth switch for selectively connecting the first diagnostic resistance section and the second diagnostic resistance section to the first insulation measurement resistance section and the second insulation measurement resistance section, respectively;
A voltage detection unit sensing the first and second fault diagnosis voltages through the first and second insulation resistance measurement units; And
A failure diagnosis circuit is formed by outputting control signals to the third and fourth switches, and when the failure diagnosis circuit is formed from the voltage detection section, And a controller for determining whether or not the fault has occurred. The method according to claim 1,
Wherein the second insulation resistance measurement unit and the first diagnosis resistance unit each comprise a DC power supply unit for supplying a preset V _DC voltage. 3. The apparatus of claim 2,
The third switch is controlled to be turned on and the first fault diagnosis voltage

The first insulation resistance measuring unit determines that a failure has occurred in the first insulation resistance measuring unit. 3. The apparatus of claim 2,
The fourth switch is controlled to be turned on and the obtained second diagnostic voltage

The second insulation resistance measurement unit determines that a failure has occurred in the second insulation resistance measurement unit. 3. The apparatus of claim 2,
The third switch is controlled to be turned on and the first fault diagnosis voltage

Wherein the controller determines that a fault has occurred in the first insulation resistance measurement unit when the temperature of the insulation resistance measurement unit is out of a predetermined error range based on the first insulation resistance measurement unit. 3. The apparatus of claim 2,
The fourth switch is controlled to be turned on and the obtained second diagnostic voltage

The second insulation resistance measuring unit determines that a failure has occurred in the second insulation resistance measuring unit when the error is out of a predetermined error range. 3. The apparatus of claim 2,
The third switch is controlled to be turned on and the third switch is judged as an open state failure when the first failure diagnosis voltage obtained is 0V. 3. The apparatus of claim 2,
The third switch is turned off, and when the first failure diagnosis voltage obtained is a voltage other than 0 V, the third switch is determined as a short-circuit failure. Measuring device. 3. The apparatus of claim 2,
And when the second fault diagnosis voltage obtained is V _DC , it is determined that the fourth switch is in an open state fault. . 3. The apparatus of claim 2,
And the fourth switch is controlled to perform an OFF operation, and when the second fault diagnosis voltage obtained is a voltage other than V _DC , the fourth switch is judged as a short-circuit fault. Resistance measuring device. The apparatus of claim 1,
A switch controller for outputting a signal for controlling ON / OFF operation of the first to fourth switches;
An A / D converter for converting an analog voltage signal output from the voltage detector into a digital voltage signal; And
And a central arithmetic processor for receiving a digital voltage signal from the A / D converter and determining whether the first and second insulation resistance measurement units and the third and fourth switches are faulty, And an insulation resistance measuring device. The method according to claim 1,
Further comprising: a transmitting unit that forms a communication interface with an external device,
Wherein the controller transmits information on whether or not a fault has occurred in the first and second insulation resistance measurement units and the third and fourth switches to the external device through the transmission unit. Resistance measuring device. 13. The method of claim 12,
Wherein the external device is a battery analyzer or a controller of a system on which a battery is mounted. The method according to claim 1,
And a warning section for outputting a visual or auditory warning signal,
Wherein the control unit outputs a visual or auditory warning signal through the warning unit when a failure occurs in at least one of the first and second insulation measurement resistance units and the third and fourth switches. And an insulation resistance measuring device having a function. First and second diagnostic resistance sections respectively connected to first and second insulation measurement resistance sections respectively connected to the positive or negative terminal of the battery, and first and second diagnostic resistance sections connected to the first and second insulation measurement resistance sections, And a fourth switch for selectively connecting the first switch and the second switch to each other, the method comprising:
(a) outputting an on / off control signal to the third or fourth switch;
(b) receiving the first and second fault diagnosis voltages detected through the first and second insulation resistance measurement units; And
and (c) determining whether the first and second insulation resistance measurement units and the third and fourth switches are faulty using the first and second fault diagnosis voltages. A method for self-diagnosis of a measuring device. 16. The method of claim 15,
Wherein the second insulation resistance measurement unit and the second diagnosis resistance unit each comprise a DC power supply unit for supplying a preset V _DC voltage. 17. The method of claim 16,
The step (a) may include: controlling the third switch to turn on; ego,
In the step (c), the first fault diagnosis voltage

Wherein the first insulation resistance measurement unit determines that a failure has occurred in the first insulation resistance measurement unit when the value of the first insulation resistance measurement unit is other than the first insulation resistance measurement unit. 17. The method of claim 16,
The step (a) may include: controlling the fourth switch to turn on; ego,
In the step (c), the second fault diagnosis voltage

The second insulation resistance measurement unit determines that a failure has occurred in the second insulation resistance measurement unit. 17. The method of claim 16,
The step (a) may include: controlling the third switch to turn on; ego,
In the step (c), the first fault diagnosis voltage

Wherein the controller determines that a fault has occurred in the first insulation resistance measurement unit when the temperature of the insulation resistance measurement unit is out of a predetermined error range. 17. The method of claim 16,
The step (a) may include: controlling the fourth switch to turn on; ego,
In the step (c), the second fault diagnosis voltage

Wherein the second insulation resistance measurement unit determines that a failure has occurred in the second insulation resistance measurement unit when the measured resistance value is out of a predetermined error range based on the first insulation resistance measurement unit. 17. The method of claim 16,
The step (a) may include: controlling the third switch to turn on; ego,
Wherein the step (c) includes the step of determining that the third switch is in an open state failure when the first failure diagnosis voltage is 0V. 17. The method of claim 16,
The step (a) may include controlling the third switch to turn off; ego,
Wherein the step (c) includes the step of determining that the third switch is in a short-circuit failure state when the first failure diagnosis voltage is a voltage other than 0 V. 17. The method of claim 16,
The step (a) may include: controlling the fourth switch to turn on; ego,
Wherein the step (c) includes the step of determining that the fourth switch is in an open state failure when the second failure diagnosis voltage is V _DC . 17. The method of claim 16,
The step (a) may include: controlling the fourth switch to turn off; ego,
Wherein the step (c) includes the step of determining that the fourth switch is in a short-circuit state failure when the second failure diagnosis voltage is a voltage other than V _DC . 16. The method of claim 15,
The method of claim 1, further comprising the step of transmitting to the external device information on whether a failure occurs in the first and second insulation resistance measurement units and the third and fourth switches. 26. The method of claim 25,
Wherein the external device is a battery analyzer or a controller of a system on which a battery is mounted. 16. The method of claim 15,
Further comprising the step of providing a visual or audible warning to the user when a failure occurs in at least one of the first and second insulation measurement resistance portions and the third and fourth switches. A method of self-diagnostics of a device.

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