KR20190101635A - Apparatus and method for diagnosing currentsensor - Google Patents

Abstract

Disclosed are an apparatus and a method for diagnosing a shunt-type current sensor connected between a first node and a second node of a high current path disposed on a high voltage domain of a battery pack. The apparatus includes: a transformer including a first primary coil and a secondary coil magnetically coupled to each other wherein the first primary coil is disposed on a low voltage domain insulated from the high voltage domain, and one end of the secondary coil is connected to the first node; a diagnosis switch disposed on the high voltage domain and connected between the other end of the second coil and the second node; and a first voltage converting unit disposed on the low voltage domain and connected to the first primary coil. The diagnosis switch is configured to be turned on in response to a switching signal. The first voltage converting unit is configured to convert an input voltage into a first output voltage required by a first control signal in response to the first control signal and to apply the first output voltage to the first primary coil. According to the present invention, it is possible to accurately diagnose a malfunction of the current sensor.

Description

Apparatus and method for diagnosing currentsensor

The present invention relates to an apparatus and method for diagnosing a current sensor, and more particularly, to an apparatus and method for diagnosing a failure of a shunt type current sensor configured to detect a charge / discharge current of a battery pack. It is about.

Recently, as the demand for portable electronic products such as laptops, video cameras, mobile phones, etc. is rapidly increased, and development of electric vehicles, storage batteries for energy storage, robots, satellites, and the like is in earnest, high-performance batteries capable of repeatedly charging and discharging Research is actively being conducted.

Currently commercialized batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium batteries. Among them, lithium batteries have almost no memory effect compared to nickel-based batteries, and thus are free of charge and discharge, and have a very high self discharge rate. Its low and high energy density has attracted much attention.

The battery pack generally includes a plurality of battery cells connected in series to provide a high voltage. In order to use the battery pack safely, the charge and discharge current of the battery pack must be measured. To do this, install a current sensor in the large current path of the battery pack. The battery management system may control the battery pack based on the current signal output by the current sensor.

The current sensor can be largely divided into a hall type and a shunt type. The shunt type current sensor includes a shunt resistor. Since the shunt resistor has a predetermined resistance value, a voltage corresponding to the magnitude of the current flowing through the shunt resistor is applied between both ends of the shunt resistor.

However, if a fault occurs in the shunt type current sensor due to any cause (eg, aging or external shock), the battery pack cannot be properly controlled.

An object of the present invention is to provide an apparatus and method for diagnosing a failure of a shunt type current sensor configured to detect a charge / discharge current of a battery pack.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. It will also be readily apparent that the objects and advantages of the invention may be realized by the means and combinations thereof indicated in the claims.

Various embodiments of the present invention for achieving the above object are as follows.

An apparatus for diagnosing a shunt type current sensor connected between a first node and a second node of a high current path disposed in a high voltage domain of a battery pack according to an aspect of the present invention includes a first primary magnetically coupled to each other. A transformer comprising a winding and a secondary winding, wherein the first primary winding is disposed in a low voltage domain insulated from the high voltage domain, and one end of the secondary winding is connected to the first node; A diagnostic switch disposed in the high voltage domain and connected between the other end of the secondary winding and the second node; And a first voltage converter disposed in the low voltage domain and connected to the first primary winding. The diagnostic switch is configured to be turned on in response to a switching signal. The first voltage converter is configured to convert an input voltage into a first output voltage required by the first control signal in response to a first control signal, and apply the first output voltage to the first primary winding. It is composed.

When the diagnostic switch is turned on while the first output voltage is applied to the first primary winding, a diagnostic voltage corresponding to the first output voltage is applied to the secondary winding. The diagnostic voltage corresponding to the first output voltage is a voltage at which the first output voltage is stepped down or stepped up according to the turns ratio of the first primary winding and the secondary winding.

The apparatus may further include a signal insulator configured to relay a signal between the high voltage domain and the low voltage domain. The switching signal may be transferred from the low voltage domain to the diagnostic switch through the signal isolation unit. The current signal output from the current sensor may be transferred to the low voltage domain through the signal insulator. The current signal may indicate a voltage applied between the first node and the second node.

The transformer may further include a second primary winding disposed in the low voltage domain and magnetically coupled to the secondary winding.

The apparatus may further include a second voltage converter disposed in the low voltage domain and connected to the second primary winding. The second voltage converter converts the input voltage into a second output voltage required by the second control signal in response to a second control signal, and applies the second output voltage to the second primary winding. It can be configured to.

The polarity of the second primary winding may be opposite to that of the second primary winding.

Battery management system according to another aspect of the present invention, the device; And a controller disposed in the low voltage domain and operatively coupled to the current sensor, the diagnostic switch, and the first voltage converter. The control unit is configured to output the first control signal and the switching signal, and then diagnose a failure of the current sensor based on the current signal from the current sensor.

A battery pack according to another aspect of the present invention includes the battery management system.

A first primary winding and a secondary winding magnetically coupled to each other according to another aspect of the present invention, wherein the first primary winding is disposed in a low voltage domain isolated from the high voltage domain of the battery pack, One end of the secondary winding is connected to a first node of a high current path disposed in the high voltage domain; A diagnostic switch disposed in the high voltage domain and connected between the other end of the secondary winding and a second node of the large current path; And a first voltage converter disposed in the low voltage domain and connected to the first primary winding, to diagnose a shunt type current sensor connected between the first node and the second node. The method may include outputting a first control signal to the first voltage converter and outputting a switching signal to the diagnostic switch by a controller disposed in the low voltage domain; And after the controller outputs the first control signal and the switching signal, diagnosing a failure of the current sensor based on the current signal from the current sensor. The first voltage converter is configured to convert an input voltage into a first output voltage in response to the first control signal, and apply the first output voltage to the first primary winding. The diagnostic switch is configured to be turned on in response to the switching signal. The current signal represents a voltage applied between the first node and the second node.

When the diagnostic switch is turned on while the first output voltage is applied to the first primary winding, a diagnostic voltage corresponding to the first output voltage is applied to the secondary winding. The diagnostic voltage corresponding to the first output voltage is a voltage at which the output voltage is stepped down or stepped up according to a turns ratio between the first primary winding and the secondary winding.

According to at least one of the embodiments of the present invention, it is possible to diagnose whether a shunt type current sensor configured to detect the charge / discharge current of the battery pack has failed.

In addition, according to at least one of the embodiments of the present invention, by controlling the magnitude of the current flowing through the shunt resistor of the current sensor, it is possible to more accurately diagnose whether or not the current sensor failure.

In addition, according to at least one of the embodiments of the present invention, by controlling the direction of the current flowing through the shunt resistor of the current sensor, it is possible to more accurately diagnose whether or not the current sensor failure.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.
1 is a view showing the configuration of a battery pack according to an embodiment of the present invention by way of example.
2 is a diagram illustrating a configuration of a diagnostic apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a diagnostic apparatus according to another embodiment of the present invention.
4 is a flowchart showing a method for diagnosing a current sensor according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Terms including ordinal numbers such as first and second are used for the purpose of distinguishing any one of the various components from the others, and are not used to limit the components by such terms.

Throughout the specification, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated. In addition, the term <control unit> described in the specification means a unit for processing at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software.

In addition, throughout the specification, when a part is "connected" to another part, it is not only "directly connected" but also "indirectly connected" with another element in between. Include.

1 is a diagram illustrating a configuration of a battery pack 10 according to an embodiment of the present invention.

Referring to FIG. 1, the battery pack 10 includes a battery module 20, a relay 30, and a battery management system 100.

The battery module 20 includes at least one battery cell 21. When a plurality of battery cells 21 are included in the battery module 20, the plurality of battery cells 21 may be connected in series, in parallel, or in parallel with each other. Each battery cell 21 is not particularly limited as long as it is a rechargeable power storage element such as a lithium ion battery.

The relay 30 is installed in the large current path of the battery pack 10. The relay 30 may be selectively turned on by the battery management system 100. When the relay 30 is turned on, current flows through the large current path, thereby charging or discharging the battery module 20. When the relay 30 is turned off, the flow of current through the high current path is blocked, thereby stopping the charging and discharging of the battery module 20.

The battery management system 100 includes a voltage sensor 102, a temperature sensor 104, a current sensor 110, a control unit 120, and a diagnostic apparatus 200.

The voltage sensor 102 is connected between the positive terminal and the negative terminal of the battery module 20. That is, the voltage sensor 102 is electrically connected in parallel to the battery module 20. The voltage sensor 102 measures the terminal voltage of the battery module 20, and outputs a voltage signal indicating the measured terminal voltage to the controller 120.

The temperature sensor 104 is disposed within a predetermined distance from the battery module 20. The temperature sensor 104 measures the temperature of the battery module 20, and outputs a temperature signal indicating the measured temperature to the controller 120.

The current sensor 110 is provided between the first node N1 and the second node N2 in the large current path. In FIG. 1, the first node N1 is shown to be connected closer to the battery module 20 than the second node N2, but vice versa. The current sensor 110 measures a current flowing through the large current path, and outputs a current signal representing the measured current to the controller 120.

The current sensor 110, as a shunt type, includes a shunt resistor 112 and an operational amplifier 114.

The shunt resistor 112 is connected between the first node N1 and the second node N2. Data representing a resistance value (eg, 0.1 ohm) of the shunt resistor 112 may be stored in the controller 120 in advance. When a current flows from one of the first node N1 and the second node N2 to the other, a voltage is applied to the shunt resistor 112. The voltage applied to the shunt resistor 112 corresponds to the potential difference between the first node N1 and the second node N2.

The operational amplifier 114 includes an inverting terminal, a non-inverting terminal, and an output terminal. The inversion terminal is connected to any one of the first node N1 and the second node N2. The non-disconnected terminal is connected to the other of the first node N1 and the second node N2. The operational amplifier 114 outputs a current signal (S _{V in} FIG. 2) through the output terminal. That is, the current signal (S _V) corresponds to the voltage applied to the shunt resistor (112). Hereinafter, as shown in FIG. 2, it is assumed that the first node N1 is connected to the inverting terminal of the operational amplifier 114 and the second node N2 is connected to the non-inverting terminal of the operational amplifier 114.

The controller 120 is operatively coupled to the relay 30, the voltage sensor 102, the temperature sensor 104, the current sensor 110, and the diagnostic apparatus 200. The control unit 120 executes a predetermined algorithm, and based on the voltage signal, the current signal, and the temperature signal, the state of the battery module 20 (for example, State-of-Charge, State-of-Health, overcharge, overdischarge). Before, overheating, etc.). For example, the controller 120 may execute an amp counting algorithm and integrate the current corresponding to the current signal with respect to time to estimate the state-of-charge of the battery module 20.

The controller 120 may control the relay 30 according to the monitored state of the battery module 20 or a command from the external device 1 (eg, an ECU of an electric vehicle). The controller 120 may also transmit a notification signal indicating the state of the monitored battery module 20 to the external device 1.

The controller 120 may be configured to include application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), and microprocessors. microprocessors) and electrical units for performing other functions. The control unit 120 or 140 may include a memory device, and a RAM, a ROM, a register, a hard disk, an optical recording medium, or a magnetic recording medium may be used as the memory device. The memory device may store, update, and / or erase a program including various control logics executed by the controller 120 and / or data generated when the control logic is executed.

Each component included in the battery pack 10 may be disposed in any one of a high voltage domain (HV of FIG. 2) and a low voltage domain (LV of FIG. 2). The high voltage domain (HV) refers to the part that is electrically connected to the high current path. That is, the battery module 20, the relay 30, the voltage sensor 102 and the current sensor 110 are arranged in the high voltage domain HV. The low voltage domain LV refers to a portion electrically insulated from the high voltage domain HV. That is, the temperature sensor 104 and the control unit 120 are arranged in the low voltage domain LV. In the diagnostic apparatus 200 to be described later, a part is disposed in the high voltage domain HV, and the other part is disposed in the low voltage domain LV.

2 is a diagram illustrating the configuration of a diagnostic apparatus 200 according to an embodiment of the present invention.

Referring to FIG. 2, the diagnostic apparatus 200 includes a transformer 210, a diagnostic switch 220, a first voltage converter 232, and a signal insulator 240.

Transformer 210 includes a first primary winding 212 and a secondary winding 216 magnetically coupled to each other. The first primary winding 212 is disposed in the low voltage domain LV. The secondary winding 216 is disposed in the high voltage domain HV. One end of the secondary winding 216 is connected to the first node N1. One end of the first primary winding 212 may be connected to ground, and the other end of the first primary winding 212 may be connected to the first voltage converter 232.

The diagnostic switch 220 is disposed in the high voltage domain HV. The diagnostic switch 220 may be implemented using a known switching element such as a field effect transistor. The diagnostic switch 220 is connected between the other end of the secondary winding 216 and the second node N2. The diagnostic switch 220 is configured to be turned on in response to the switching signal S _S output by the controller 120. The diagnostic switch 220 is configured to be turned off when the controller 120 stops outputting the switching signal SS. When the diagnostic switch 220 is turned on, the secondary winding 216 is connected in parallel to the shunt resistor 112 through the first node N1, the second node N2, and the diagnostic switch 220.

The first voltage converter 232 is disposed in the low voltage domain LV. The first voltage converter 232 receives an input voltage from an external power source (for example, a lead acid battery) disposed in the low voltage domain LV in response to the first control signal S _C1 output by the controller 120. Converts (V _I ) to the first output voltage V _O1 required by the first control signal S _C1 and applies the first output voltage V _O1 to the other end of the first primary winding 212. Is configured to. The first voltage converter 232 may include a multiple output DCDC converter. For example, the multi-output DCDC converter is configured to selectively generate any one of various levels of voltages such as 3V, 5V, and 7V as the first output voltage V _O1 using an input voltage V _I of _8-18V . It may be. The multi-output DCDC converter may gradually change the level of the first output voltage V _O1 applied to the other end of the first primary winding 212 in response to the first control signal S _C1 . Accordingly, the diagnostic voltage V _D applied to the secondary winding 216 may also change in stages.

When the first output voltage V _O1 is applied to the first primary winding 212 while the diagnostic switch 220 is turned on, the secondary winding 216 may correspond to the first output voltage V _O1 . The diagnostic voltage V _D is applied. First diagnostic voltage (V _D) corresponding to the output voltage (V _O1), the first primary of the first output voltage (V _O1) is applied to the coil 212, the first primary winding 212 and the secondary It may be stepped up or down depending on the ratio of turns between the windings 216. Since the secondary winding 216 is connected in parallel to the shunt resistor 112 through the diagnostic switch 220, the diagnostic current flows through the shunt resistor 112 by the diagnostic voltage V _D. Accordingly, the operational amplifier 114, and outputs a current signal (S _V) represents a voltage applied to the shunt resistor 112 by a diagnosis current. When the first voltage converter 232 changes the first output voltage V _O1 applied to the other end of the first primary winding 212 in response to the first control signal S _C1 , 2 Since the diagnostic voltage V _D applied to the secondary winding 216 also changes, the magnitude of the diagnostic current flowing through the shunt resistor 112 also changes.

The signal insulation unit 240 is disposed over the high voltage domain HV and the low voltage domain LV. The signal insulation unit 240 transmits a signal from the high voltage domain HV to the low voltage domain LV while maintaining the electrical insulation state between the high voltage domain HV and the low voltage domain LV, and the low voltage domain LV. Is configured to deliver a signal from to the high voltage domain (HV).

To specifically, signal isolation unit 240, the high voltage domain (HV), the calculated the control unit 120 places the current signal (S _V) to the low voltage domain (LV) which is output from the output terminal of the amplifier 114 is arranged to Configured to deliver. The signal isolation unit 240 is also configured to transmit the switching signal S _S output from the control unit 120 disposed in the low voltage domain LV to the diagnostic switch 220 disposed in the high voltage domain HV. The signal isolation unit 240 may be implemented using, for example, a digital isolator, an optical isolator, or the like.

Control unit 120, by dividing the voltage indicated by the current signal (S _V) with a resistance value of the shunt resistor 112, it is possible to detect the magnitude and direction of current flowing through the shunt resistor 112.

Control unit 120, the diagnostic mode, a diagnosis whether a failure of the current sensor 110 on the basis of the current signal (S _V). The controller 120 may determine the first target voltage range based on the turns ratio of the first primary winding 212 and the secondary winding 216 and the first output voltage V _O1 . The lower limit value of the first target voltage range may be obtained by subtracting a predetermined offset value from a product between the turns ratio of the first primary winding 212 and the secondary winding 216 and the first output voltage V _O1 . The upper limit value of the first target voltage range may be the sum of the offset values in a product between the turns ratio of the first primary winding 212 and the secondary winding 216 and the first output voltage V _O1 .

For example, the resistance value of the shunt resistor 112 is 0.1 ohm, the first output voltage V _O1 applied to the first primary winding 212 is 5V, and the first primary winding 212 and the secondary winding are Let's say that the turns ratio of (216) is 2: 1, and there is no power loss. Then, a diagnostic voltage V _D of 2.5 V is applied to the secondary winding 216 so that a diagnostic current of 25 A flows from the first node N1 to the second node N2. When the voltage between the first node N1 and the second node N2 indicated by the current signal SV from the current sensor 110 is within 2.45 to 2.55V, which is the first target voltage range, the controller 120 may generate a current. It may be determined that the sensor 110 is normal. On the other hand, when the voltage between the first node (N1) and a second node (N2) represented by the current signal (S _V) from the current sensor 110 exceeds the first target voltage range, the control part 120 is a current sensor ( 110 may be determined to be a failure.

3 is a diagram illustrating a configuration of a diagnostic apparatus 200 according to another embodiment of the present invention.

Referring to FIG. 3, the transformer 210 further includes a second primary winding 214, and the diagnostic apparatus 200 further includes a second voltage converter 234. There is a difference from the device 200. In addition, repeated description of the same configuration will be omitted.

The second primary winding 214 is disposed in the low voltage domain LV and magnetically coupled to the secondary winding 216. The number of turns of the second primary winding 214 may be the same as or different from the number of turns of the first primary winding 212. One end of the second primary winding 214 may be connected to ground, and the other end of the second primary winding 214 may be connected to the second voltage converter 234.

Note that the polarity of the first primary winding 212 and the polarity of the second primary winding 214 may be opposite to each other. That is, the direction in which the second primary winding 214 is wound may be opposite to the direction in which the first primary winding 212 is wound. Of course, the polarity of the first primary winding 212 and the polarity of the second primary winding 214 may be the same.

The second voltage converter 234 is disposed in the low voltage domain LV. In response to the second control signal S _C2 output by the controller 120, the second voltage converter 234 requests the input voltage V _I to be requested by the second control signal S _C2 . converted to a second output voltage (V _O2), and the second is configured to apply the output voltage (V _O2) to the other end of the second primary winding (214).

The controller 120 may selectively output only one of the first control signal S _C1 and the second control signal S _C2 . That is, the output of the first control signal a second control signal a first control signal (S _C1) while to stop the output of the (S _C2), and outputting a second control signal (S _C2) while the output (S _C1) You can stop. Of course, the controller 120 may output the other while one of the first control signal S _C1 and the second control signal S _C2 is output.

The second voltage converter 234, like the first voltage converter 232, may include a multi-output DCDC converter. The second voltage converter 234 may gradually change the level of the second output voltage V _O2 applied to the other end of the second primary winding 214 in response to the second control signal S _C2 . Can be. Accordingly, the diagnostic voltage V _D applied to the secondary winding 216 is changed in stages.

When the second output voltage V _O2 is applied to the second primary winding 214 while the diagnostic switch 220 is turned on, the secondary winding 216 may correspond to the second output voltage V _O2 . The diagnostic voltage V _D is applied. Diagnostic voltage (V _D) corresponding to the second output voltage (V _O2), the second primary winding 214 is a second output voltage (V _O2) of the second primary winding 214 and the secondary to It may be stepped up or down depending on the ratio of turns between the windings 216. If the second voltage converter 234 changes the level of the second output voltage VO2 applied to the other end of the second primary winding 214 in response to the second control signal S _C2 , Since the diagnostic voltage V _D applied to the secondary winding 216 also changes, the diagnostic current flowing through the shunt resistor 112 also changes.

Controller 120, to diagnose the fault whether the diagnostic mode, the second control signal current signal, a current sensor 110, based on the (S _V) is output by the current sensor 110 in response to the (S _C2) do. The controller 120 may first output one of the first control signal S _C1 and the second control signal S _C2 , and then output the other.

Control unit 120, the first control signal (S _C1) and a second control signal (S _C2) of the second control signal (S _C2) when diagnosing only the output by the current sensor 110, the second primary winding Based on the turn ratio 214 and the secondary winding 216 and the second output voltage V _O2 , the second target voltage range may be determined. The lower limit value of the second target voltage range may be obtained by subtracting the offset value from a product between the turns ratio of the second primary winding 214 and the secondary winding 216 and the second output voltage V _O2 . The upper limit of the second target voltage range may be the sum of the offset values in a product between the turns ratio of the second primary winding 212 and the secondary winding 216 and the second output voltage V _O2 .

When the second primary winding 214 is magnetically coupled to the secondary winding 216 with a polarity opposite to the first primary winding 212, the secondary winding by the first output voltage (V _O1 ) the sign of the diagnostic voltage (V _D) derived on 216 is the sign of the diagnostic voltage (V _D) induced in the secondary winding (216) by the second output voltage (V _O2) is reversed. For example, a diagnostic voltage V _D of 2.5 V is induced in the secondary winding 216 by a first output voltage V _{O1 of} 5 V, and a second output voltage V _O2 of 5 V. A diagnostic voltage V _D of −2.5 V may be induced in the winding 216.

In the diagnostic mode, the controller 120 outputs the first control signal Sc _C1 to allow the diagnostic current to flow from the first node N1 to the second node N2, and outputs the first control signal Sc _C1 from the second node N2. The second control signal _SC2 may be output to allow the diagnostic current to flow to the first node N1.

4 is a flowchart illustrating a method for diagnosing a current sensor 110 according to an embodiment of the present invention.

Referring to FIG. 4, in step S410, the controller 120 determines whether the relay 30 is turned off. If the value of step S410 is "YES", step S420 is performed.

In operation S420, the controller 120 enters a diagnostic mode for the current sensor 110.

In step S430, control unit 120, and outputs a first voltage converting unit a first control signal (S _C1) to (232), and outputs a switching signal (S _S) to the diagnostic switch 220. The output of the second control signal _SC2 may be stopped. Accordingly, the first output voltage VO1 is applied to the first primary winding 212, and the diagnostic voltage V _D corresponding to the first output voltage V _O1 is humanized in the secondary winding 216. . As the diagnostic current flows from the first node N1 to the second node N2 by the diagnostic voltage V _D corresponding to the first output voltage V _O1 , the current sensor 110 shunts 112. ) and it outputs the current signal (S _V) represents a voltage applied to the.

In step S442, control unit 120 receives the current signal (S _V) output from the current sensor 110. In step S444, the control part 120, based on the current signal (S _V), it is determined whether failure of the current sensor (110). If the value of step S444 is "YES", step S470 proceeds. If the value of step S444 is "NO", step S450 proceeds.

In step S450, control unit 120, the output a second control signal (S _C2) to the second voltage converting section 234, and outputs a switching signal (S _S) to the diagnostic switch 220. The output of the first control signal S _C1 may be stopped. Accordingly, the second output voltage V _O2 is applied to the second primary winding 214, and the diagnostic voltage V _D corresponding to the second output voltage V _O2 is applied to the secondary winding 216. do. As the diagnostic current flows from the second node N2 to the first node N1 by the diagnostic voltage V _D corresponding to the second output voltage V _O2 , the current sensor 110 is connected to the first node. N1) and outputs a current signal (S _V) representing the voltage applied between the second node (N2).

In step S462, control unit 120 receives the current signal (S _V) output from the current sensor 110. In step S464, the control part 120, based on the current signal (S _V), it is determined whether failure of the current sensor (110). If the value of step S464 is "YES", step S470 proceeds. If the value of step S464 is "NO", step S480 proceeds.

In operation S470, the controller 120 outputs a first diagnostic message indicating that the current sensor 110 has failed. The first diagnostic message may be received by the external device 1.

In operation S480, the controller 120 outputs a second diagnostic message indicating that the current sensor 110 is normal. The second diagnostic message can be received by the external device 1.

On the other hand, the current signal (S _V) is output by the current sensor 110 while operating in the controller 120, the diagnostic mode on to monitor the state of charge (State-of-Charge) of the battery module 20 May not be used.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

In addition, the present invention described above is capable of various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those of ordinary skill in the art to which the present invention pertains to the above-described embodiments and attached Not limited by the drawings, all or part of the embodiments may be selectively combined to enable various modifications.

10: Battery Pack
20: battery module
30: relay
100: battery management system
110: current sensor
112: shunt resistance
114: operational amplifier
120: control unit
200: diagnostic device
210: transformer
220: diagnostic switch
232: a first voltage converter
234: second voltage converter
240: signal insulation

Claims (11)

An apparatus for diagnosing a shunt type current sensor connected between a first node and a second node of a high current path disposed in a high voltage domain of a battery pack,
A first primary winding and a secondary winding magnetically coupled to each other, wherein the first primary winding is disposed in a low voltage domain isolated from the high voltage domain, and one end of the secondary winding is connected to the first node. Transformer connected;
A diagnostic switch disposed in the high voltage domain and connected between the other end of the secondary winding and the second node; And
A first voltage converter disposed in the low voltage domain and connected to the first primary winding;
The diagnostic switch,
In response to the switching signal, configured to be turned on,
The first voltage converter,
In response to a first control signal, configured to convert an input voltage to a first output voltage required by the first control signal and to apply the first output voltage to the first primary winding.
The method of claim 1,
When the diagnostic switch is turned on while the first output voltage is applied to the first primary winding, a diagnostic voltage corresponding to the first output voltage is applied to the secondary winding.
And the diagnostic voltage corresponding to the first output voltage is a voltage at which the first output voltage is stepped down or stepped up according to the turns ratio of the first primary winding and the secondary winding.
The method of claim 1,
And a signal insulator configured to relay a signal between the high voltage domain and the low voltage domain.
The method of claim 3,
The switching signal is transferred from the low voltage domain to the diagnostic switch through the signal isolation unit.
The current signal output from the current sensor is transferred to the low voltage domain through the signal insulator,
The current signal is indicative of a voltage applied between the first node and a second node.
The method of claim 1,
The transformer,
A second primary winding disposed in the low voltage domain and magnetically coupled to the secondary winding;
The device further comprises.
The method of claim 5,
A second voltage converter disposed in the low voltage domain and connected to the second primary winding;
The second voltage converter,
In response to a second control signal, converting the input voltage to a second output voltage required by the second control signal and applying the second output voltage to the second primary winding.
The method of claim 5,
Wherein the polarity of the second primary winding is opposite to the polarity of the second primary winding.
An apparatus according to any one of the preceding claims; And
And a controller disposed in the low voltage domain and operatively coupled to the current sensor, the diagnostic switch, and the first voltage converter.
The control unit,
Outputting the first control signal and the switching signal and then diagnosing a failure of the current sensor based on the current signal from the current sensor.
A battery management system according to claim 8;
Including, a battery pack.
And a first primary winding and a secondary winding magnetically coupled to each other, wherein the first primary winding is disposed in a low voltage domain insulated from the high voltage domain of a battery pack, and one end of the secondary winding is in the high voltage domain. A transformer connected to the first node of the large current path disposed at the; A diagnostic switch disposed in the high voltage domain and connected between the other end of the secondary winding and a second node of the large current path; And a first voltage converter disposed in the low voltage domain and connected to the first primary winding, to diagnose a shunt type current sensor connected between the first node and the second node. In the method for
A control unit disposed in the low voltage domain, outputting a first control signal to the first voltage converter, and outputting a switching signal to the diagnostic switch; And
And after the controller outputs the first control signal and the switching signal, diagnosing a failure of the current sensor based on the current signal from the current sensor.
The first voltage converter is configured to convert an input voltage into a first output voltage in response to the first control signal, and apply the first output voltage to the first primary winding.
The diagnostic switch is configured to be turned on in response to the switching signal,
And the current signal represents a voltage applied between the first node and a second node.
The method of claim 10,
When the diagnostic switch is turned on while the first output voltage is applied to the first primary winding, a diagnostic voltage corresponding to the first output voltage is applied to the secondary winding.
And the diagnostic voltage corresponding to the first output voltage is a voltage whose output voltage is stepped down or stepped up according to a turns ratio between the first primary winding and the secondary winding.

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