Circuit fault detector, electric vehicle charge controller including the same, and circuit fault detection method

Abstract

To provide a fault detector capable of separately detecting various fault modes of a motor vehicle.SOLUTION: A circuit fault detector includes an input terminal that receives a detection signal having a first frequency from an interlock circuit, a correction circuit that corrects a voltage of the input detection signal, a first comparator that compares the corrected detection signal with a first reference voltage and outputs a high voltage signal or a low voltage signal, a second comparator that inverts the corrected detection signal and compares the inverted detection signal with a second reference voltage and outputs the high voltage signal or the low voltage signal, a count signal generator that generates a count signal having a second frequency, a first coupler that couples the output signal of the first comparator with the count signal, a second coupler that couples the output signal of the second comparator with the count signal, and a controller that detects a circuit fault based on the output signal of the first coupler and the output signal of the second coupler.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention includes an input terminal for receiving a detection signal having a first frequency from an interlock circuit. a correction circuit for correcting the voltage of the input detection signal; and a first reference voltage a first comparator for outputting a high voltage signal or a low voltage signal by comparing the corrected detection signal and comparing the inverted detection signal with a second reference voltage to determine a high voltage signal or a low voltage signal. a second comparator for outputting a count signal having a second frequency; a first combiner for combining an output signal of the first comparator and the count signal; a second combiner for combining the output signal of the second comparator and the count signal; and a controller for detecting a circuit fault based on the input signal and the output signal of the second coupler. Regarding the circuit fault detector. [Background technology]

[0002] An electric vehicle is a vehicle that gets its driving energy from electrical energy rather than from the combustion of fossil fuels. These electric cars have no exhaust gases and are very quiet. Because they are small, they have the advantage of being pollution-free and environmentally friendly. Batteries, which are a source of energy, are essential, and the batteries need to be made lighter and smaller and have shorter charging times. Because of this, the practical application of electric vehicles has been delayed.

[0003] On the other hand, in order to build infrastructure for electric vehicles, it is essential to install charging stations nationwide. Charging stations are like gas stations for conventional cars. It can provide power to batteries, which are an energy source, and the rapid development of electric vehicles today As they become more popular, more charging stations are being installed.

[0004] At this time, when the electric vehicle is connected to a charging station to charge or discharge, In the process of discharging, a closed charging loop may be formed. It can also be used to supply electricity from a power source to an electric vehicle, and discharge electricity from an electric vehicle to a charging station. can.

[0005] By the way, when an electric vehicle is charging or discharging at a charging station, a short circuit (s short circuit, open circuit, battery short circuit, ground (vehicle body) short circuit, etc. Referring to FIG. 1, in the case of a conventional electric vehicle, a bad mode may occur. Unidirectional loop interrupts in mode detection A detection method is used.

[0006] Also, referring to FIG. 1, in a conventional electric vehicle, the internal control parts (ECU, etc.) In the event of a failure mode caused by an overcurrent, the fuse 110 is further included between the The circuit breaks the wire to detect the occurrence of defects.

[0007] However, in the conventional method of dealing with failure modes, the fuse is blown when a failure mode occurs. This is inconvenient as it requires replacing the fuse every time it is turned on, and the fuse may blow. It is not possible to detect failure modes when there is no overcurrent that is large enough to cause a breakdown. There was a problem. Also, the HVIL (High-Voltage Interlock) module However, there was a drawback in that even if a defect occurred in the module itself, the defect could not be diagnosed. Summary of the Invention [Problem to be solved by the invention]

[0008] As described above, the present invention overcomes the drawbacks of the conventional electric vehicle failure mode detector. In order to detect a circuit failure, a first comparator and a second comparator are used to detect a circuit failure based on two output signals. and to provide a circuit failure detector capable of distinguishing and detecting various failure modes. The purpose of this document is to

[0009] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems, but are described below. From the content to be explained, various technical problems can be derived within the scope that is obvious to a person of ordinary skill in the art. [Means for solving the problem]

[0010] In order to solve the above problems, a circuit fault detector according to an embodiment of the present invention is an input terminal for receiving a detection signal having a first frequency from the clock circuit; a correction circuit for correcting the voltage of the detection signal by adding an offset voltage to the voltage of the output signal; a first reference voltage and outputs a high voltage signal or a low voltage signal. a comparator; inverting the corrected detection signal and comparing the inverted detection signal with a second reference voltage; a second comparator outputting a high voltage signal or a low voltage signal; and a counting signal having a second frequency. a count signal generator for generating a count signal; and a count signal generator for generating a count signal by connecting the output signal of the first comparator and the count signal. a first coupler for combining the output signal of the second comparator with the count signal; a combiner; and a circuit fault detection circuit based on the output signal of the first combiner and the output signal of the second combiner. and a controller for detecting the , when the output signal of the first coupler and the output signal of the second coupler are equal to or greater than a preset value, It is possible to detect that the interlock circuit is in a normal state.

[0011] In one embodiment of the present invention, the controller is configured to combine the output signal of the first coupler and the output signal of the second coupler. When the output signal of the coupler is a low voltage signal, the interlock circuit is open (Ope n) It is possible to detect a circuit failure in the state.

[0012] In one embodiment of the present invention, the controller is configured to: and when the output signal of the second coupler is a low voltage signal, the interlock circuit Detects a circuit failure in the Battery-Short state. It is possible.

[0013] In one embodiment of the present invention, the controller is configured to: and when the output signal of the second coupler is equal to or greater than a preset value, the interlock circuit It is possible to detect a circuit failure in the ground short (GND-Short) state. can be done.

[0014] In one embodiment of the present invention, the controller is configured to: When the second frequency of the output signal of the second coupler is out of the preset range, the interlock It is possible to detect that the circuit is faulty.

[0015] In addition, the circuit fault detector according to an embodiment of the present invention detects an arbitrary detection signal having a first frequency. and an arbitrary detection signal generator for generating an arbitrary detection signal and inputting the arbitrary detection signal to the input terminal. It can include.

[0016] In one embodiment of the present invention, the controller is Detecting a circuit fault based on the output signal of the first coupler or the output signal of the second coupler. It is possible.

[0017] According to another embodiment of the present invention, there is provided an input terminal, a correction circuit, a first comparator, a second comparator, a counter CIRCUIT FAULT DETECTOR INCLUDING SIGNAL GENERATOR, FIRST COUPLER, SECOND COUPLER AND CONTROLLER - Patent application The detection method includes: (a) receiving a detection signal having a first frequency from an interlock circuit to the input terminal; (b) applying an offset to the voltage of the input detection signal by the correction circuit. (c) correcting the voltage of the detection signal by applying a set voltage to the first comparator; After comparing the corrected detection signal with the first reference voltage, a high voltage signal or a low voltage signal is detected. (d) the second comparator inverts the corrected detection signal and outputs the inverted signal; After comparing the inverted detection signal with a second reference voltage, a high voltage signal or a low voltage signal is output. (e) generating a count signal having a second frequency by the count signal generator. (f) generating an output signal of the first comparator by the first combiner; (g) combining the count signal with the second combiner; and (g) combining the count signal with the second ratio by the second combiner. (h) combining the output signal of the comparator with the count signal by the controller; A circuit fault is detected based on the output signal of the first coupler and the output signal of the second coupler. and;

[0018] In the circuit failure detection method according to one embodiment of the present invention, in the step (h), When the output signal of the first coupler and the output signal of the second coupler are equal to or greater than a preset value, It is possible to detect that the tarlock circuit is in a normal state.

[0019] In the circuit failure detection method according to one embodiment of the present invention, in the step (h), When the output signal of the first coupler and the output signal of the second coupler are low voltage signals, -It is possible to detect a circuit failure in which the lock circuit is open. .

[0020] In the circuit failure detection method according to one embodiment of the present invention, in the step (h), The output signal of the first coupler is equal to or greater than the preset value, and the output signal of the second coupler is a low voltage signal. When the interlock circuit is in a battery-short state, This makes it possible to detect a circuit failure in the actual state.

[0021] In the circuit failure detection method according to one embodiment of the present invention, in the step (h), The output signal of the first coupler is a low voltage signal, and the output signal of the second coupler is equal to or greater than a preset value. When the interlock circuit is in a ground short (GND-Short) state, It is possible to detect a road failure.

[0022] In the circuit failure detection method according to one embodiment of the present invention, in the step (h), The second frequency of the output signal of the first coupler or the output signal of the second coupler is within a preset range. If it comes loose, it can be detected that the interlock circuit is defective.

[0023] According to another embodiment of the present invention, an electric vehicle charging controller includes a circuit fault detector; a power connector for receiving power from a charging station for a vehicle; and a power connector connected to the power connector. a relay circuit; and a power supply means connected to the relay circuit for supplying power to a battery of the electric vehicle. a power supply circuit; and the circuit fault detector receives a first frequency from an interlock circuit. an input terminal for receiving an input of a detection signal; and a correction circuit for correcting the voltage of the input detection signal. and; comparing the corrected detection signal with a first reference voltage to output a high voltage signal or a low voltage signal. a first comparator for inverting the corrected detection signal and comparing the inverted detection signal with a second reference voltage; a second comparator for outputting a high voltage signal or a low voltage signal in response to a second frequency; a count signal generator for generating a count signal; and a count signal generator for generating a count signal based on the output signal of the first comparator and a first combiner for combining the output signal of the second comparator and the count signal; and a second combiner based on the output signal of the first combiner and the output signal of the second combiner, a controller for detecting a circuit fault; and when the controller detects a circuit fault, - The switch in the circuit can be opened. Effect of the Invention

[0024] The circuit fault detector and the electric vehicle charging controller including the same of the present invention are A detection signal is input to detect the state of the closed loop during the discharge process, and a first comparator and a second comparator are connected to the detection signal. The output signal of the comparator and the combined output signal of the combiner are divided into four states to Failure modes can be detected.

[0025] In addition, the circuit fault detector and the electric vehicle charging controller including the same of the present invention are Four failure modes: battery short, ground short, and open can be detected separately.

[0026] In addition, the circuit fault detector and the electric vehicle charging controller including the same of the present invention are Since it is possible to distinguish between failure modes, it is possible to provide convenience in fault diagnosis.

[0027] In addition, the circuit fault detector and the electric vehicle charging controller including the same of the present invention are The device does not receive the detection signal generated by the electric vehicle, but generates an arbitrary detection signal by itself. , HVIL signal loss failure mode can also be sensed.

[0028] In addition, the circuit fault detector and the electric vehicle charging controller including the same of the present invention do not use a fuse. It contains a separate controller instead of a relay that opens the relay circuit when the controller detects a circuit fault. This reduces the repair costs compared to disposable fuses. When returning from a faulty mode to a normal mode, even if there is no loss of related components (such as fuses), Normal operation will then be possible without any further action.

[0029] In addition, the circuit fault detector and the electric vehicle charging controller including the same of the present invention have a simple circuit configuration. Since it is simple, it can reduce self-failure.

[0030] In addition, the circuit fault detector and the electric vehicle charging controller including the same according to the present invention are No separate design changes based on the signal configuration of the electric vehicle are required, and the model It can be installed and used in a module-independent form or in an electric vehicle-linked form. [Brief description of the drawings]

[0031] [Figure 1] This relates to an embodiment of a failure mode prevention circuit for a conventional electric vehicle. [Diagram 2]The present invention relates to a circuit fault detector and an electric vehicle according to an embodiment of the present invention. [Diagram 3] The present invention relates to a configuration of a circuit failure detector according to an embodiment of the present invention. [Figure 4] 1 is a circuit diagram showing a configuration of a circuit fault detector according to an embodiment of the present invention. [Figure 5a] 4 is a graph of an output signal for a normal state of a circuit fault detector according to an embodiment of the present invention. [Figure 5b] 4 is a graph of an output signal for a normal state of a circuit fault detector according to an embodiment of the present invention. [Figure 6a] 13 is a circuit diagram of an electric vehicle in an open state according to another embodiment of the present invention. [Figure 6b] 13 is a circuit diagram of an electric vehicle in an open state according to another embodiment of the present invention. [Figure 7] 11 is a graph showing an output signal of a circuit fault detector in an open state of an electric vehicle according to another embodiment of the present invention; [Figure 8a] 13 is a circuit diagram showing a battery short circuit state of an electric vehicle according to another embodiment of the present invention; [Figure 8b] 13 is a circuit diagram showing a battery short circuit state of an electric vehicle according to another embodiment of the present invention; [Figure 9] 11 is a graph showing an output signal of a circuit fault detector in a battery short state of an electric vehicle according to another embodiment of the present invention. [Figure 10a] 13 is a circuit diagram showing a configuration of an electric vehicle in a ground short state according to another embodiment of the present invention; [Figure 10b] 13 is a circuit diagram showing a configuration of an electric vehicle in a ground short state according to another embodiment of the present invention; [Figure 11] 11 is a graph of an output signal of a circuit fault detector in a ground short condition of an electric vehicle according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, a circuit fault detector and an electric vehicle charging device including the same according to the present invention will be described with reference to the accompanying drawings. The embodiment described herein is a detailed description of the technical concept of the present invention that is applicable to those skilled in the art. The present invention is not limited by these descriptions. It should be noted that the matters shown in the attached drawings are for the purpose of more easily explaining the embodiments of the present invention. The embodiments are formulaic and may differ from the actual implementation.

[0033] On the other hand, the components described below are merely examples for implementing the present invention. In other realizations of the present invention, other modifications may be made without departing from the spirit and scope of the present invention. The components are available.

[0034] In addition, the expression "including" a certain component is an "open" expression, and the component It is understood as merely indicating the existence of something and excluding further components. It won't be.

[0035] Furthermore, expressions such as "first," "second," etc. may be used to distinguish between multiple components. The expressions are used only for the purpose of illustration and do not limit the order or other characteristics of the components.

[0036] In the description of the embodiments, each layer (film), region, pattern or structure is a substrate, each layer (film), , formed "on" or "under" a region, pad, or pattern. When the term "a layer" is used, it means that the layer is formed directly or via another layer. In addition, the reference to the top or bottom of each layer will be explained based on the drawings.

[0037] When a part is said to be "connected" to another part, this means that it is "directly connected" to the other part. This applies not only when the two are connected to each other, but also when they are indirectly connected to each other through other components in between. Also, when a part "contains" a certain component, this is not a statement that is specifically opposed. Unless otherwise stated, this does not mean to exclude other elements, but to further include other elements. This means that it is possible.

[0038] FIG. 2 shows the configuration of a circuit fault detector and an electric vehicle according to an embodiment of the present invention. FIG. 3 relates to a configuration of a circuit fault detector according to an embodiment of the present invention.

[0039] 2 and 3, an electric vehicle 210 is connected to a charging station 220 and charged. When discharging, various components (inverters, motors, etc.) included in the electric vehicle 210 The PDU, isolation protection device, and charging battery) are supplied with power from the charging station 220. In particular, the components in electric vehicles are complex and have a variety of circuits. Therefore, when an overvoltage or overcurrent is applied, the overall operation of the electric vehicle is There is a risk that the system will stop functioning.

[0040] The circuit fault detector according to the embodiment of the present invention detects a number of different electronic components included in an electric vehicle. The state of the voltage applied to a number of parts is detected to determine whether there is a circuit failure. In the present invention, the circuit fault detector is preferably located inside the electric vehicle, It can prevent electric vehicle failure modes under the control of the charging controller, and the relay circuit It can be connected to open the closed loop circuit to protect the electric vehicle components.

[0041] FIG. 4 is a circuit diagram of a circuit fault detector according to an embodiment of the present invention.

[0042] 3 and 4, the circuit fault detector of the present invention includes an input terminal 310, a correction circuit 32 0, the first comparator 330, the second comparator 340, the count signal generator 350, and the first coupler 36 0, a second coupler 370, and a controller 380.

[0043] The input terminal 310 receives a detection signal having a first frequency from the interlock circuit. Electric vehicles can move while connected to a charging station, and can also use the charging station. Various failure modes such as abnormalities and damage to the vehicle's internal circuits may occur. Interlock circuits are installed to prevent losses of electric vehicles caused by failure modes of It can include.

[0044] At this time, the interlock circuit detects the state of various parts of the electric vehicle and A detection signal having a number of pulses can be generated. Furthermore, the detection signal can be pulse-width modulated ( It is composed of PWM (Pulse Width Modulation) signals and has a period (D By converting the uty, various states can be modulated and expressed. The detection signal is a square wave with a first frequency of 88 Hz and a period (duty) of 50%. can.

[0045] The detection signal input to the input terminal is passed through a correction circuit, a comparator, and a coupler. The output signal can be used to determine whether or not the mode is defective.

[0046] The correction circuit 320 can correct the voltage of the input detection signal. If the detector is used as is, the error in the detection signal cannot be accurately measured from a comparator or controller. Therefore, the correction circuit of the present invention corrects the voltage of the detection signal to detect the circuit failure. It can be easily done.

[0047] More specifically, the correction circuit 320 of the present invention applies an offset to the voltage of the input detection signal. The circuit fault detector of the present invention can be provided with a voltage to correct the voltage drop. For batteries contained in cars, the battery voltage swings between 9 and 16V. ), the detection signal can be corrected using the battery voltage. The correction circuit described above offsets the input detection voltage to the battery voltage or an arbitrary set voltage. The signal can be corrected with a preset square wave.

[0048] More specifically, the compensation circuit 320 of the present invention adjusts the buffer voltage to a constant value by voltage division. An operational amplifier that receives the terminating voltage, and an output value of the operational amplifier and an input terminal of the Another operational amplifier receives the detection signal to be applied, and a number of other voltage adjustments It can contain resistors, capacitors for charging, noise elimination and circuit stabilization, etc. .

[0049] A comparator is a circuit that compares one voltage with another. , receive the input voltage, compare it with the reference voltage, and It detects whether the voltage exceeds a reference voltage and outputs the result mainly as a digital (low, high The comparator of the present invention is a device that outputs a value as a reference voltage. It is also possible to compare the length and output one of them.

[0050] The first comparator 330 of the present invention compares the corrected detection signal with a first reference voltage to determine whether the high voltage The second comparator 340 of the present invention can output a low voltage signal or a low voltage signal. The inverted detection signal is inverted and compared with a second reference voltage to determine whether a high voltage signal or a low voltage signal.

[0051] More specifically, the first comparator 330 and the second comparator 340 of the present invention are The input signal and the first reference voltage are compared by an operational amplifier, and the voltage is adjusted to a constant value by voltage division. Numerous resistors to generate the desired voltage, capacitors for filling, noise elimination and circuit stabilization It can include "shita" etc.

[0052] At this time, the first comparator 330 and the second comparator 340 output mutually inverted signals. The first comparator receives the input of the corrected voltage and compares it with the reference voltage. The detection signal is applied to the + input terminal of the operational amplifier, while the complement signal is input to the second comparator. The corrected detection signal is applied to the negative input terminal of the operational amplifier. The signals output from the second comparator have mutually inverted values, and using these output signal values, Circuit failures having different failure modes can be effectively detected.

[0053] In addition, the first reference voltage of the first comparator of the present invention is the second reference voltage of the second comparator. In the present invention, the detection signal applied to the first comparator is inverted to obtain a second comparator. A second reference voltage is applied to the comparator to generate an output signal that is lower than the first reference voltage. It is possible.

[0054] For example, the first reference voltage of the present invention is set to 2 / 3 of the battery voltage by an operational amplifier. The connected resistor can be configured so that the second reference voltage is 1 / 3 of the battery voltage. The resistor connected to the operational amplifier can be configured as follows:

[0055] In addition, the first comparator 330 of the present invention is configured to detect whether the corrected detection signal is greater than the first reference voltage. If the second comparator of the present invention is higher than the first comparator, the second comparator can output the corrected detection signal. 340, when the inverted detection signal is lower than the second reference voltage, A signal can be output.

[0056] In addition, the comparators 330 and 340 of the present invention are configured to compare the values ​​of the reference voltages. Depending on + or -, it can output a high voltage signal (high) or a low voltage signal (low). However, if the input signal is higher or lower than the reference voltage, it can be output as is. Therefore, the first and second comparators of the present invention compare the input voltage with the reference voltage and then The corrected detection signal can be output.

[0057] The count signal generator 350 can generate a count signal having a second frequency. The count signal is combined with the detection signal by a combiner, which will be described later, and the controller produces the final output signal. A circuit fault can be detected by using only the detection signal, but In this case, the output signal will only output high or low state values. Therefore, it is not possible to distinguish between various states. The path failure detector further includes a count signal generator 350 and a detector coupled to the count signal. The output signal can be used to effectively detect circuit faults.

[0058] At this time, the second frequency generated by the count signal is a frequency higher than the first frequency. For example, the second frequency of the present invention is about 10 kHz, and the first frequency is about 88 Hz. Each of them can have

[0059] A first combiner 360 combines the output signal of the first comparator 330 and the count signal. The second combiner 370 may combine the output signal of the second comparator 340 and the count signal. As described above, the signals output from the comparators 330 and 340 can be combined. By combining the count signal with the first frequency, a final output having a first frequency and a second frequency is obtained. At this time, the combiners 360 and 370 function as AND gates (AN D Gate).

[0060] 5a and 5b, the final output signal of the detection signal combined with the count signal is We can confirm this by enlarging the horizontal axis (time) scale of Figure 5a. During the high period of the first frequency of the detection signal, the second frequency of the count signal is It can be seen that the 1 / 0 / 1 / 0 states are alternated as shown below.

[0061] The controller 380 controls the output signal of the first combiner 360 and the output signal of the second combiner 370. Based on the signal, a circuit fault can be detected. The output signal of the second coupler 370 is detected, and the state of the output signal is confirmed. At this time, the output signal of the first coupler 360 is in a high state. In this state, the output signal of the second coupler 370 is detected in a low state to detect a circuit fault.

[0062] Referring to FIG. 5a, the controller 380 of the present invention receives the output signal of the first combiner 360 and The output signal (ex>pulse count, FIG. 5b) of the second coupler 370 is greater than or equal to a preset value. When the above-mentioned interlock circuit is in a normal state, it can be detected that the power supply is in a normal state. When the charging closed loop of the electric vehicle is in a normal state, the input detection signal is normally high. , and the low state alternately, so that the controller 380 of the present invention can Verify that the output signal of the second coupler is normally above a certain value (high value). , it is possible to detect that the interlock circuit is in a normal state.

[0063] Referring to FIG. 5b, the controller 380 of the present invention operates in such a way that the high and low signals of FIG. 5a alternate. To ensure that the signal is repeated over time, a higher frequency signal is combined and counted. It can be confirmed that:

[0064] The results from 0 to 6.3 hours in Figure 5a were enlarged to show that high frequency signals were combined as shown in Figure 5b. The controller 380 of the present invention can check the output of the first coupler 360. The output of the second coupler 370 is counted. Detect circuit failures by counting the signal (low-side pulse in Figure 5b). It is possible to count the number of pulses and check whether the input signal has a normal cycle. It can be confirmed.

[0065] 6a and 6b are diagrams illustrating an electric vehicle according to another embodiment of the present invention in an open state. FIG. 7 is a circuit diagram of an electric vehicle according to another embodiment of the present invention. 11 is a graph of the output signal of the circuit fault detector in a pun state.

[0066] 6a, 6b and 7, the controller 380 of the present invention controls the output of the first coupler. when the input signal and the output signal of the second coupler are low voltage signals, the interlock circuit It is possible to detect an open circuit failure.

[0067] If the interlock circuit is in an open state, This means that the applied detection signal is not connected to either of the input terminals. The overall electric vehicle open state 410, 420 is represented by the circuit of FIG. 6a or FIG. 6b. This is because the circuit failure of the present invention can be realized by using various components included in an electric vehicle. It can be said that an open state (disconnection) failure mode occurred in the part sensed by the good detector.

[0068] Referring to FIG. 7, when the interlock circuit is in an open state, the first coupling of the present invention The output signal of the second coupler 360 and the output signal of the second coupler 370 can be checked. When the interlock circuit is in the open state, no further detection signal 400 is applied to the input terminal. Since the first coupler and the second coupler cannot enter the Therefore, the controller of the present invention senses that all output signals are low voltage signals. , it can detect when parts of the electric vehicle are in an open state.

[0069] 8a and 8b are diagrams illustrating a battery short circuit (B FIG. 9 is a circuit diagram for the current According to another embodiment of the present invention, the output signal of the circuit fault detector in a battery short state of the electric vehicle is This is a graph of the number.

[0070] 8a, 8b and 9, the controller of the present invention is is equal to or greater than the preset value and the output signal of the second coupler is a low voltage signal. -The lock circuit is in a battery-short state. It is possible to detect this.

[0071] The interlock circuit is located inside the electric vehicle and is therefore A battery short state occurs in which the node 510 and the interlock circuits 410 and 420 are shorted. This can occur when the power input node 510 of the battery 500 is connected to both input terminals 41 This means that the car is connected to either the 420 or 420 series. The battery short condition can be expressed by the circuit of Figure 8a or Figure 8b. Therefore, Among various components included in an electric vehicle, the circuit fault detector of the present invention detects a fault in a part of the electric vehicle. It can be said that a failure mode of a battery short circuit occurred, in which a short circuit occurred with the battery.

[0072] Referring to FIG. 9, when the interlock circuit is in a battery short state, The states of the output signals of the first coupler and the second coupler can be confirmed. When the teri-short state occurs, the first coupler outputs a high signal that is higher than the preset value. The second coupler outputs a low voltage signal (0). The output signals of the first coupler and the second coupler are detected to detect whether the electric vehicle components are short-circuiting the battery. It is possible to detect the state.

[0073] 10a and 10b are diagrams showing a ground show of an electric vehicle according to another embodiment of the present invention. FIG. 11 is a circuit diagram for a power-on state according to another embodiment of the present invention. 4 is a graph of the output signal of a circuit fault detector under a short-to-ground condition in an electric vehicle.

[0074] Referring to FIG. 10a, FIG. 10b and FIG. 11, the controller of the present invention controls the output of the first coupler. when the input signal is a low voltage signal and the output signal of the second coupler is equal to or greater than a preset value, The interlock circuit is in a ground short (GND-Short) state. It is possible to detect this.

[0075] The interlock circuit is located inside the electric vehicle, so it is connected to ground 520 and the interlock circuit. A ground short condition may occur that shorts the overlock circuit. In this case, the vehicle body itself, which is made of metal, acts as the ground, so the interlock circuit Such a failure mode can occur when part of the bearing comes into contact with the vehicle body.

[0076] This is because the ground 520 is connected to either one of the input terminals 410, 420. This means that the overall ground short condition of an electric vehicle is shown in Figure 10a and can be expressed by the circuit in Fig. 10b. A ground shield that is shorted to ground in the part detected by the circuit fault detector of the present invention is used. It can be said that a short circuit failure mode occurred.

[0077] Referring to FIG. 11, when the interlock circuit is in a ground short condition, The state of the output signal of the first coupler and the output signal of the second coupler of the invention can be confirmed. In the case of a short-to-ground condition, the first coupler outputs a low voltage signal (0) and the second coupler The controller outputs a signal that is equal to or higher than the preset value (high). Therefore, the controller of the present invention The output signals of the first coupler and the second coupler are sensed to determine whether the components of the electric vehicle are grounded. It is possible to detect a short circuit state.

[0078] In addition, the controller 380 of the present invention controls the output signal of the first coupler 360 or the output signal of the second coupler 360. If the second frequency of the output signal of the combiner 370 is out of the preset range, the interloop The detection signal input to the input terminal of the present invention can detect whether the lock circuit is defective. The signal can be combined with the count signal to generate the final output signal, but under normal conditions In this case, the final output signal has a constant second frequency, as shown in FIG. 5b.

[0079] However, an abnormality has occurred in a component included in an electric vehicle or in the count signal generator itself. In this case, an abnormality may occur in the second frequency. More specifically, In this state, 55 high / low cycles may be repeated. If there is an abnormality in the count signal generator, 40 or 100 high / low crossings will occur. In some cases, frequency abnormalities may occur, such as the frequency being repeatedly switched between the two. By detecting the second frequency, a failure mode of the electric vehicle can be identified.

[0080] In addition, the circuit fault detector of the present invention may further include an arbitrary detection signal generator. The arbitrary detection signal generator generates an arbitrary detection signal having a first frequency and supplies the arbitrary detection signal to the input terminal. The controller of the present invention can input the arbitrary detection signal. the output signal of the first coupler or the output signal of the second coupler generated by the Based on this, circuit failures can be detected.

[0081] In the case of the above-mentioned detection signal, the circuit fault detector of the present invention does not generate it, but the interlock circuit generates it. However, in the circuit fault detector according to another embodiment of the present invention, A failure mode in which the input terminal detection signal itself is damaged by generating a detection signal for the body. It is also possible to use any detection signal without receiving a signal from the vehicle. This makes it possible to efficiently detect failure modes of vehicle parts.

[0082] On the other hand, the circuit fault detector of the present invention may be used in the electric vehicle charging controller 211, It may also be included in the electric vehicle 210.

[0083] The electric vehicle charging controller 211 according to an embodiment of the present invention includes a circuit fault detector and an electric self- a power connector for receiving power from a charging station for a vehicle; a relay circuit; and a power supply connected to the relay circuit for supplying power to the electric vehicle battery. a power supply circuit, the circuit fault detector receiving a first frequency from an interlock circuit. an input terminal for receiving an input of a detection signal; and a correction circuit for correcting the voltage of the input detection signal. The corrected detection signal is compared with a first reference voltage to output a high voltage signal or a low voltage signal. a first comparator for inverting the corrected detection signal and comparing the inverted detection signal with a second reference voltage; a second comparator for outputting a high voltage signal or a low voltage signal; and a counter having a second frequency. a count signal generator for generating a count signal; a first coupler for combining the output signal of the second comparator with the count signal; a second coupler, and a circuit based on the output signal of the first coupler and the output signal of the second coupler. and a controller for detecting a circuit fault, and when the controller detects a circuit fault, the relay The switch in the circuit can be opened.

[0084] The circuit fault detector described above only detects faults in the circuits included in the electric vehicle. Further configuration for dealing with circuit failures can be realized by the electric vehicle charging controller. For this reason, the electric vehicle charging controller of the present invention includes a circuit fault detector, a power connector, , a relay circuit, and a power supply circuit.

[0085] When an electric vehicle connects to a charging station to receive power, the power connector receives the power. The power supply circuit can then supply power to the battery of the electric vehicle.

[0086] The electric vehicle charging controller of the present invention further includes a relay circuit, and a circuit fault detector controller. If the system detects a circuit fault, it will open the relay circuit switch to put the electric vehicle into a safe state. Convert it into a state.

[0087] On the other hand, the electric vehicle 210 according to one embodiment of the present invention includes an interlock circuit and a circuit interrupter. a power connector for receiving power from an electric vehicle charging station; a relay circuit connected to the connector; and a battery of the electric vehicle connected to the relay circuit. a power supply circuit for supplying power to the power connector, the power connector including a power input port and an interlock port, the interlock circuit generating a detection signal having a first frequency; a detection signal generator for generating a detection signal; at least one electronic component included in the electric vehicle; A detection conductor connected to an interlock port and the detection signal generator to form a closed loop. the circuit fault detector receiving a detection signal having a first frequency from an interlock circuit; An input terminal for receiving an input, a correction circuit for correcting the voltage of the input detection signal, and a corrected detection a first comparator for comparing the signal with a first reference voltage and outputting a high voltage signal or a low voltage signal; The corrected detection signal is inverted, and the inverted detection signal is compared with a second reference voltage to obtain a high voltage signal. a second comparator for outputting a count signal having a second frequency or a low voltage signal; a count signal generator for generating a count signal; and a second comparator for combining the output signal of the first comparator and the count signal. a first combiner and a second combiner for combining the output signal of the second comparator and the count signal; Detecting a circuit fault based on the output signal of the first coupler and the output signal of the second coupler. and a controller for switching the relay circuit when the controller detects a circuit fault. can be opened.

[0088] The electric vehicle may include various components, and the components, interlock ports, detection The circuit of the present invention includes a detection conductor connected to a signal generator to form a closed loop. The fault detector can check the charging status of the electric vehicle through the detection conductor, and After checking the failure mode like the control method of the automobile charging controller, open control of the relay circuit This control allows the electric vehicle to be in a safe state.

[0089] At this time, the electric vehicle charging controller and the circuit fault detector included in the electric vehicle are The circuit fault detector may be embodied to include all of the components and functions of the circuit fault detector.

[0090] The above-described embodiments of the present invention have been disclosed for purposes of illustration only. The present invention is not limited by the above. Various modifications and variations are possible within the spirit and scope of the present invention. , modifications should be considered within the scope of the present invention.

Claims

[Claim 1] an input terminal for receiving a detection signal from the interlock circuit; a correction circuit that corrects the voltage of the input detection signal; The voltage of the corrected detection signal is compared with a first reference voltage to output a high voltage signal or a low voltage signal. a first comparator for inputting a first signal; The corrected detection signal is inverted, and the voltage of the inverted detection signal is compared with a second reference voltage to determine a high voltage. a second comparator outputting a low voltage signal or a low voltage signal; a count signal generator for generating a count signal; Based on the output signal of the first comparator, the output signal of the second comparator, and the count signal, and a controller for detecting a circuit fault. Circuit fault detector.

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