JP5796387B2 - Vehicle charging device and vehicle charging system - Google Patents

Description

  The present invention relates to a vehicle charging device and a vehicle charging system for charging a vehicle using an electric motor such as a so-called plug-in hybrid vehicle as a drive source.

  In recent years, in consideration of environmental problems, vehicles using an electric motor as a drive source for vehicle travel are becoming popular. As a charging stand for charging such a vehicle, for example, the one described in Patent Document 1 is known.

  When a charging connector is connected to a vehicle having a communication function with the charging station side, the charging station described in Patent Document 1 starts application of a voltage based on a result of communication with the vehicle. When a charging connector is connected to a vehicle having no function, application of voltage is started by operating a charging start switch. In addition, there is an international standard defined as SAEJ1772 that defines the standard of the connector for charging and the communication specifications between the charging stand side and the vehicle side.

JP 2010-283902 A

  In this charging stand, when charging a vehicle having no communication function, the charging connector is not securely fitted to the vehicle side when voltage application is started only by operating the charging start switch. However, since the application of the voltage is started, there is a possibility that the charging stand may be broken or damaged when a short circuit or a leakage occurs in the charging connector.

  Therefore, the present invention provides a vehicle charging device and a vehicle charging system capable of starting charging after determining whether or not a short circuit or electric leakage occurs in the charging connector before starting charging. It is in.

In order to solve the above problems, the present invention includes a charging connector having a pair of output terminals, a charging cable connected to the charging connector, and an apparatus main body for charging the vehicle via the charging cable. A charging device for a vehicle, comprising: a charging current output circuit that outputs a charging current to the vehicle from the pair of output terminals; and an inspection signal generator that generates an inspection signal including an AC component; A first inspection signal output circuit that outputs the inspection signal from one output terminal of the pair of output terminals; a first voltage measurement unit that measures a voltage of the other output terminal of the pair of output terminals; A voltage between a second inspection signal output circuit for outputting the inspection signal from the one output terminal via a plurality of resistors and the plurality of resistors of the second inspection signal output circuit. Measurement And the charging current on the condition that the voltage measured by the first voltage measuring unit during the output of the test signal by the first test signal output circuit is within a predetermined range. A control unit that enables the output of the charging current by the output circuit, and the control unit measures the second voltage measurement unit during the output of the test signal by the second test signal output circuit. Provided is a vehicle charging device for notifying an abnormality when the applied voltage is equal to or higher than a predetermined value.

The present invention is also directed to a charging connector having a pair of output terminals, a charging cable connected to the charging connector, and an apparatus main body for charging the vehicle via the charging cable, in order to solve the above problems. The apparatus main body includes a charging current output circuit that outputs a charging current to the vehicle from the pair of output terminals, and an inspection signal generator that generates an inspection signal including an AC component. A first test signal output circuit that outputs the test signal from one output terminal of the pair of output terminals, and a first voltage measurement that measures a voltage of the other output terminal of the pair of output terminals parts and a third test signal output circuit for outputting from the other output terminal of said test signal via a plurality of resistors, between the plurality of resistors of the third test signal output circuit Electric A voltage measured by the first voltage measuring unit during the output of the test signal by the first test signal output circuit is within a predetermined range. A control unit that enables the charging current output circuit to output the charging current, and the control unit outputs the third voltage measuring unit during the output of the inspection signal by the third inspection signal output circuit. Provided is a vehicle charging device for notifying an abnormality when the voltage measured in (1) is equal to or higher than a predetermined value.

The inspection signal generated by the inspection signal generation unit may have a frequency of the alternating current component of 100 Hz to 1 kHz.

  In order to solve the above-described problems, the present invention provides the above vehicle charging device, a storage battery that stores electric power supplied to an electric motor that generates a driving force for traveling the vehicle, and the storage battery. A vehicle comprising: an input connector having a pair of input terminals for receiving a charging current; and a filter circuit provided between the input connector and the storage battery and including a capacitor connected between the pair of input terminals. Provide a charging system.

  According to the present invention, it is possible to start charging after determining whether or not a short circuit or electric leakage occurs in the charging connector before starting charging.

It is a schematic block diagram which shows the charging device for vehicles which concerns on embodiment of this invention. 1 is a schematic configuration diagram showing a vehicle charging system and a vehicle according to an embodiment of the present invention. It is a front view which shows the structure of a charge connector. It is a circuit diagram which shows the example of a schematic structure of the charging device for vehicles, and a filter circuit. In the circuit configuration example of FIG. 4, it is explanatory drawing which shows the example of the transmission path | route of a test signal with a thick line. It is a graph which shows an example of the relationship between the electrostatic capacitance of a 1st capacitor | condenser, and a voltage measured value. In the circuit configuration example of FIG. 4, it is explanatory drawing which shows the example of the transmission path | route of a test signal with a thick line. In the circuit configuration example of FIG. 4, it is explanatory drawing which shows the example of the transmission path | route of a test signal with a thick line. FIG. 5 is a diagram in which peripheral circuits around the C terminal and the P terminal are added to the circuit configuration example of FIG. In the circuit configuration example shown in FIG. 9, the path of the output current of the DC power supply when the C terminal and the P terminal are short-circuited is indicated by a bold line. It is a flowchart which shows the whole outline | summary of the process sequence which a control part performs. It is a flowchart which shows the procedure of the charging connector fitting determination process which a control part performs. It is a flowchart which shows the procedure of the earth-leakage determination process which a control part performs. It is a flowchart which shows the procedure of the short circuit / leakage determination process which a control part performs.

[Embodiment]
Hereinafter, an example of a vehicle charging device and a vehicle charging system according to an embodiment of the present invention will be described with reference to FIGS.

(Configuration of vehicle charging device)
FIG. 1 is a schematic configuration diagram showing a vehicle charging device according to an embodiment of the present invention.

  The vehicle charging device 1 includes a charging gun 12 having a charging connector 11 provided at the tip thereof, a charging cable 13 connected to the charging connector 11 via the charging gun 12, and a vehicle described later via the charging cable 13. 9 includes a main body 10 for charging the battery 9 and a power cable 14 having a plug 140 provided at the tip. The plug 140 has three terminals 140a to 140c described later.

  The charging gun 12 is provided with a release button 120. The release button 120 is integrally formed with an engagement protrusion 120a. When the release button 120 is pressed, the engagement protrusion 120a is operated, and an operation for extracting the charging connector 11 fitted to the vehicle 9 described later is performed. It is configured to be possible.

  The apparatus main body 10 is provided with an indicator 15 as display means for displaying a state related to charging. The indicator 15 includes a lamp 151 that indicates that charging is possible, a lamp 152 that indicates that charging is being performed, and a lamp 153 that indicates that an abnormality such as a short circuit or leakage has been detected. As the lamps 151 to 153, for example, LEDs (light emitting diodes) can be used.

(Configuration of vehicle charging system)
FIG. 2 is a schematic configuration diagram showing the vehicle charging system and the vehicle according to the embodiment of the present invention.

  The vehicle charging system 100 includes a vehicle charging device 1, an input connector 91 fitted to the charging connector 11, a filter circuit 92 connected to an input terminal (described later) of the input connector 91, and a filter circuit 92 An inrush current limiting circuit 93 connected to the rear stage, a rectifier circuit 94 connected to the rear stage of the inrush current limiting circuit 93, a charge control device 95 connected to the rear stage of the rectifier circuit 94, and a charge control device 95 And a storage battery 96 that is charged by the output.

  The input connector 91, the filter circuit 92, the inrush current limiting circuit 93, the rectifier circuit 94, the charging control device 95, and the storage battery 96 are mounted on the vehicle body 90 of the vehicle 9. The filter circuit 92 is configured as an EMI (Electro Magnetic Interference) filter. The inrush current limiting circuit 93 has a function of interrupting a sudden inrush current at the start of charging. The rectifier circuit 94 is composed of a diode bridge circuit, for example. The charging control device 95 monitors the amount of power stored in the storage battery 96, the temperature of the storage battery 96, and the like, and controls the start and end of charging. The storage battery 96 is made of, for example, a lithium ion battery having a plurality of cells.

  The vehicle body 90 also supplies an electric motor 98 that generates a driving force for running the vehicle 9 and the electric power stored in the storage battery 96 to the electric motor 98 as a motor current switched by PWM (Pulse Width Modulation) control. And an inverter 97 for reducing the output of the electric motor 98 and transmitting it to the front wheels 901. In the present embodiment, the vehicle 9 is configured as a two-wheel drive vehicle in which the driving force of the electric motor 98 is transmitted only to the front wheels 901, but four-wheel drive in which the driving force is transmitted to the front wheels 901 and the rear wheels 902. It may be a car.

  The plug 140 of the power cable 14 of the vehicle charging device 1 is fitted to an outlet C that outputs AC power having a voltage of 200 V and a frequency of 50 Hz or 60 Hz, for example. The apparatus main body 10 is connected to a commercial power supply via a power cable 14.

(Configuration of input connector 91)
FIG. 3 is a front view showing the configuration of the charging connector 11 of the vehicle charging device 1 from the terminal side. This charging connector 11 is compliant with SAEJ1772.

  The charging connector 11 includes a housing 110, an L terminal 111 and an N terminal 112 as a pair of output terminals that output a voltage for charging the vehicle 9, a grounded GND terminal 113, and a C terminal as a charging control terminal. 114 and a P terminal 115 as a fitting detection terminal.

(Circuit structure of the charging device 1 for vehicles)
FIG. 4 is a circuit diagram showing a schematic configuration example of the vehicle charging device 1 and the filter circuit 92 connected to the input connector 91 on the vehicle 9 side. In this figure, the peripheral circuits around the C terminal 114 and the P terminal 115 are not shown.

  The plug 140 is connected to a terminal 140a connected to the ungrounded side of the commercial power supply by fitting to the outlet C (shown in FIG. 2), a terminal 140b connected to the grounded side of the commercial power supply, and a ground terminal of the outlet C. And a terminal 140c to be connected.

  The apparatus main body 10 has terminals 10a, 10b, and 10c connected to the terminals 140a, 140b, and 140c via the first to third electric wires 141 to 143 of the power cable 14, respectively. Moreover, the apparatus main body 10 has terminals 10d, 10e, and 10f connected to the L terminal 111, the N terminal 112, and the GND terminal 113 via the first to third electric wires 131 to 132 of the charging cable 13, respectively. Yes. The terminal 10c and the terminal 10f are connected by a wiring 231.

  The apparatus main body 10 includes a control unit 30 that is operated by a power source obtained by converting commercial power supplied from the terminals 10a and 10c into, for example, DC 5V. Lamps 151 to 153 are connected to the control unit 30, and the lamps 151 to 153 can emit light by a current output from the control unit 30. In addition, the apparatus main body 10 includes a DC power source 34 that converts commercial power supplied from the terminals 10a and 10c to DC 12V.

  Further, the apparatus main body 10 includes an inspection signal generation unit 20 that generates an inspection signal including an AC component. In the present embodiment, the inspection signal generator 20 outputs a sinusoidal AC voltage generated by switching the DC voltage output from the DC power supply 34 by PWM control by the controller 30 as an inspection signal. Note that an AC test signal may be generated by a DA converter that converts a digital signal output from the control unit 30 into an analog signal and an amplifier circuit that amplifies the output of the DA converter. The frequency of the AC component (fundamental wave) of the inspection signal is desirably set between 100 Hz and 1 kHz, for the reason described later. The inspection signal generation unit 20 generates an inspection signal based on the potential (ground potential) of the wiring 202 connected to the wiring 231.

  The apparatus main body 10 also includes a charging current output circuit 101 for outputting a charging current from the L terminal 111 and the N terminal 112 to the vehicle 9. The charging current output circuit 101 includes the relay 21 and the relay 22, the wiring 211 that connects the input side of the relay 21 and the terminal 10a, the wiring 212 that connects the output side of the relay 21 and the terminal 10d, and the input of the relay 22 The wiring 221 is connected to the terminal 10b, and the wiring 222 is connected to the output side of the relay 22 and the terminal 10e.

  The apparatus body 10 also includes a first inspection signal output circuit 102 for outputting the inspection signal generated by the inspection signal generator 20 from the L terminal 111. The first inspection signal output circuit 102 includes a switching element 24, a wiring 201 that connects the input side of the switching element 24 and the inspection signal generator 20, and a wiring 241 that connects the output side of the switching element 24 and the wiring 212. And is configured.

The apparatus main body 10 also includes a second inspection signal output circuit 103 for outputting the inspection signal generated by the inspection signal generator 20 from the L terminal 111 via the _two resistors 25r ₁ and 25r ₂ . . The second inspection signal output circuit 103 includes a switching element 25, resistors 25r ₁ and 25r ₂ , a wiring 201 that connects the input side of the switching element 25 and the inspection signal generator 20, and an output side of the switching element 25 connected to a wiring 251 for connecting the one end of the resistor 25r _1, a wiring 252 for connecting the other end of the resistor 25r ₁ and one end of the resistor 25r _2, the other end of the resistor 25r ₂ and the wiring 212 Wiring 253 to be configured. In this embodiment, the resistance value of the resistor 25r ₁ and resistor 25r ₂ is set to the same.

The apparatus main body 10 also includes a third inspection signal output circuit 104 for outputting the inspection signal generated by the inspection signal generator 20 from the N terminal 112 via the _two resistors 26r ₁ and 26r ₂ . . The third inspection signal output circuit 104 includes a switching element 26, resistors 26r ₁ and 26r ₂ , a wiring 201 that connects the input side of the switching element 26 and the inspection signal generation unit 20, and an output side of the switching element 26. connected to a wiring 261 for connecting the one end of the resistor 26r _1, a wiring 262 for connecting the other end of the resistor 26r ₁ and the one end of the resistor 26r _2, the other end of the resistor 26r ₂ and the wiring 222 Wiring 263 to be configured. In this embodiment, the resistance value of the resistor 26r ₁ and resistor 26r ₂ is set to the same.

  In addition, the apparatus main body 10 includes a first voltage measuring unit 105 for measuring the voltage at the N terminal 112. The first voltage measurement unit 105 includes a switching element 27, a resistor 27r, a voltmeter 31, a wiring 271 connecting the wiring 222 and one end of the resistor 27r, the other end of the resistor 27r, and the switching element 27. A wiring 272 that connects the input side of the switching element 27, a wiring 273 that connects the output side of the switching element 27 and the wiring 202, and a wiring 311 that connects the wiring 271 and the voltmeter 31. The voltmeter 31 detects the voltage of the wiring 311 (the voltage of the N terminal 112) with reference to the ground potential of the wiring 202. The resistance value of the resistor 27r is preferably 1 to 3 kΩ, and more preferably 1.5 to 2.5 kΩ. In the present embodiment, the resistance value of the resistor 27r is set to 2 kΩ.

Further, the apparatus body 10 is provided with a second voltage measurement unit 106 that measures a voltage of the wiring 252 between the resistor 25r ₁ of the second test signal output circuit 103 and the resistor 25r _2. The second voltage measuring unit 106 includes a voltmeter 32 and a wiring 321 that connects the wiring 252 and the voltmeter 32. Voltmeter 32 detects the voltage of the wiring 321 relative to the ground potential of the wiring 202 (the voltage between the resistor 25r ₁ and the resistor 25r _2).

Further, the apparatus body 10 is provided with a third voltage measuring unit 107 for measuring the voltage of the wiring 262 between the resistor 26r ₁ of the third test signal output circuit 104 and the resistor 26r _2. The third voltage measuring unit 107 includes a voltmeter 33 and a wiring 331 that connects the wiring 262 and the voltmeter 33. Voltmeter 33 detects the voltage of the wiring 331 relative to the ground potential of the wiring 202 (the voltage between the resistor 26r ₁ and the resistor 26r _2).

  The control unit 30 includes a CPU (central processing unit) 301, a storage unit 302 including a storage element that stores an operation program of the CPU 301, relays 21 and 22, and switching elements 24 and 25 according to the processing result of the CPU 301. , 26, 27 are provided with a switching circuit 303 for switching on or off. A signal indicating the detection results of the voltmeters 31, 32, and 33 is input to the control unit 30, and the CPU 301 performs processing based on this signal.

  The switching circuit 303 turns on each relay by energizing the coils of the relays 21 and 22 according to a command signal from the CPU 301, and turns off each relay by cutting off this energization. The switching circuit 303 outputs a signal for on / off control of the switching elements 24, 25, 26, and 27 in accordance with a command signal from the CPU 301.

  As the switching elements 24 to 27, semiconductor switching elements such as transistors and FETs (Field Effect Transistors) can be used. In addition, you may implement | achieve the function of the switching elements 24-27 not only with a semiconductor switching element but with a relay.

In the following description, the effective value of the AC component voltage of the inspection signal at the output end of the inspection signal generator 20 is Vo, and the voltage of the wiring 311 (the voltage of the N terminal 112) detected by the voltmeter 31 is the measured value. and V _31, a voltage line 321 detected by the voltmeter 32 as a measurement value _{V 32,} the voltage of the wiring 331 which is detected by the voltmeter 33 and the measured value _{V 33.} As the voltmeters 31 to 33, for example, an AD converter that converts a voltage value into a digital signal and outputs the digital signal to the control unit 30 can be used. In this case, the control unit 30 stores the voltage value (instantaneous value) detected by the voltmeters 31 to 33 for at least one period of the detection signal, calculates the effective value of the AC component, and calculates the calculation result as the measured value V _31. , V ₃₂ , V ₃₃ .

(Circuit configuration of the input connector 91 and the filter circuit 92)
The input connector 91 provided on the vehicle 9 side includes a first input terminal 911 connected to the L terminal 111, a second input terminal 912 connected to the N terminal 112, and a ground terminal 913 connected to the GND terminal 113. And have. A filter circuit 92 is connected to the first input terminal 911, the second input terminal 912, and the GND terminal 113 of the input connector 91.

  The filter circuit 92 includes first to fifth capacitors 41 to 45, first and second coils 46 and 47, and wirings 401 to 407. The wiring 401 connects the first input terminal 911, one end of the first capacitor 41, one end of the second capacitor 42, and one end of the first coil 46. The wiring 402 connects the second input terminal 912, the other end of the first capacitor 41, one end of the third capacitor 43, and one end of the second coil 47. The first capacitor 41 is connected to the input connector 91 side with respect to the second and third capacitors 42 and 43.

  The other end of the first coil 46 and one end of the fourth capacitor 44 are connected by a wiring 403. The other end of the second coil 47 and one end of the fifth capacitor 45 are connected by a wiring 404. The wirings 403 and 404 are connected to an inrush current limiting circuit 93 (shown in FIG. 2).

  The other end of the second capacitor 42 and the other end of the third capacitor 43 are connected by a wiring 405. The other end of the fourth capacitor 44 and the other end of the fifth capacitor 45 are connected by a wiring 406. The wiring 405 and the wiring 406 are connected to the ground terminal 913 by the wiring 407.

  The first capacitor 41 is a bypass capacitor provided between the first input terminal 911 and the second input terminal 912 of the input connector 91. The capacitance of the first capacitor 41 varies depending on the manufacturer of the vehicle 9 and the vehicle type, but generally 0.1 to 1 μF is used.

  The second to fifth capacitors 42 to 45 have a capacitance of 2000 pF, for example. The first and second coils 46 and 47 have an inductance of, for example, 10 mH.

(Fitting and short circuit detection method)
Next, a method in which the control unit 30 detects a fitting or non-fitting between the charging connector 11 and the input connector 91 and a short circuit between the L terminal 111 and the N terminal 112 will be described.

  FIG. 5 shows the transmission of the inspection signal of the inspection signal generator 20 when the control unit 30 outputs a command signal to the switching circuit 303 and turns on the switching element 24 and the switching element 27 in the circuit configuration example of FIG. It is a figure which shows a path | route with a thick line.

  At this time, when the charging connector 11 and the input connector 91 are fitted, the inspection signal output from the inspection signal generator 20 is the wiring 201, the switching element 24, the wiring 241, the wiring 212, the first Electric wire 131, L terminal 111, first input terminal 911, wiring 401, first capacitor 41, wiring 402, second input terminal 912, N terminal 112, second electric wire 132, wiring 222, wiring 271 and resistor 27r , Reflux through the wiring 272, the switching element 27, the wiring 273, and the wiring 202. In addition, since the electrostatic capacitances of the second to fifth capacitors 42 to 45 are extremely small as compared with the first capacitor 41, the inspection signals do not substantially flow through the second to fifth capacitors 42 to 45.

In this case, the measured value V 31 by the voltmeter ₃₁ is a voltage dropped by the first capacitor 41 and divided by the resistor 27 r, and the test signal voltage Vo output from the test signal generator 20 and the reference The voltage value is between the potential. When the frequency of the test signal is cut-off frequency in the transmission path, the 2 ^ voltage Vo of the test signal measured values V ₃₁ outputs the inspection signal generation unit 20 - is (0.5). For example, when the amplitude of the AC component of the inspection signal output from the inspection signal generator 20 is ± 6 V (effective value is 4.24 V), the measured value V ₃₁ is about 3.0 V.

Therefore, the control unit 30 can determine that the measurement value V ₃₁ is that the inspection connector of the charging connector 11 and the input connector 91 is fitted and the inspection signal of the inspection signal generator 20 flows through the first capacitor 41. When it is within the predetermined range, it can be determined that a short circuit or leakage in the charging connector 11 has not occurred, and it can be detected that the charging connector 11 and the input connector 91 are fitted.

The upper limit value V _SH and the lower limit value V _SL of the predetermined range are designed based on, for example, the capacitance of the first capacitor 41, the resistance value of the resistor 27r, and the resistance values of the first and second electric wires 131 and 132. The voltage value V _S of the N terminal 112 when it is assumed to be the value can be set in anticipation of a certain error. For example, the upper limit value V _SH can be set to + 10% of the voltage value V _S and the lower limit value V _SL can be set to −10% of the voltage value V _S. Alternatively, the upper limit value V _SH and the lower limit value V _SL may be determined based on the voltage of the inspection signal output by the inspection signal generator 20. For example, the upper limit value V _SH is set to, for example, 50 to 95% of the voltage Vo of the inspection signal output from the inspection signal generator 20, and the lower limit value V _SL is set to, for example, 5 to 5 of the voltage Vo of the inspection signal output from the inspection signal generator 20. It may be 50%.

On the other hand, if the measured value _{V 31} is higher than the upper limit _{V SH} is the L terminal 111 and the N terminal 112 can be determined to be short-circuited. This is because when the measured value V ₃₁ is higher than the upper limit value V _SH , there is no voltage drop due to the first capacitor 41, and the L terminal 111 and the N terminal 112 are short-circuited. This is because it can be estimated that the voltage of the inspected inspection signal appears at the N terminal 112 as it is.

Also, if the measured value V ₃₁ is lower than the lower limit value V _SL it can be determined that the charging connector 11 and the input connector 91 and is not engaged. This is because, if the measured value _{V 31} is lower than the lower limit value _{V SL} is not the first capacitor 41 is interposed between the L terminal 111 and the N terminal 112, and the L terminal 111 and the N terminal 112 This is because it can be estimated that the charging connector 11 and the input connector 91 are not fitted.

Figure 6 is a graph showing an example of the relationship between the capacitance and the measured value V ₃₁ of the first capacitor 41. The capacitance on the horizontal axis shows the measured value V ₃₁ is the vertical axis.

As described above, the capacitance of the first capacitor 41 is used as the 0.1～1MyuF, measurement V ₃₁ changes according to the capacitance. Therefore, the upper limit value V _SH is the first value so that the fitting between the charging connector 11 and the input connector 91 can be detected regardless of the value of the capacitance of the first capacitor 41 in the range of 0.1 to 1 μF. Is higher than the theoretical value (V _{1.0 on} the vertical axis of the graph) of the measured value V ₃₁ when the capacitance of the capacitor 41 is 1 μF, and the lower limit value V _SL is 0 when the capacitance of the first capacitor 41 is 0. It is desirable to set it lower than the theoretical value (V _{0.1 on} the vertical axis of the graph) of the measured value V _{31 in} the case of 1 μF.

The frequency of the inspection signal is preferably 100 Hz to 1 kH when the capacitance of the capacitor 41 is 0.1 to 1 μF. If the frequency of the inspection signal is between 100 Hz and 1 kHz, the variation range of the measured value V ₃₁ can be increased depending on the presence or absence of the first capacitor 41, and the capacitance error or resistance of the first capacitor 41 can be increased. The influence of the error of the resistance value of the device 27r can be reduced, and the charging connector 11 and the input connector 91 can be more reliably determined to be fitted or not fitted.

(Leakage detection method for L terminal 111 or N terminal 112)
Next, a method in which the control unit 30 detects a short circuit (leakage) between the L terminal 111 or the N terminal 112 of the charging connector 11 and the GND terminal 113 will be described.

  7 shows a circuit configuration example of the vehicular charging apparatus 1 shown in FIG. 4. The control unit 30 outputs a command signal to the switching circuit 303 to turn on the switching element 25, and the L terminal 111 and the GND terminal 113. It is a figure which shows the transmission path | route of the test | inspection signal of the test | inspection signal generation part 20 when a short circuit is carried out with a thick line.

At this time, the inspection signal output from the inspection signal generator 20 includes the wiring 201, the switching element 25, the wiring 251, the resistor 25 r ₁ , the wiring 252, the resistor 25 r ₂ , the wiring 253, the wiring 212, and the first electric wire 131. , Reflux through the L terminal 111, the G terminal 113, the third electric wire 133, and the wiring 202.

In this case, the measured value V 32 by the voltmeter ₃₂ is divided into the resistor 25r ₁ and the resistor 25r ₂ because the voltage Vo of the test signal output from the test signal generator 20 is divided into the resistance 25r ₁ . a voltage value corresponding to the ratio of the resistance value and the resistance value of the resistor 25r _2. In this embodiment, the resistor because the resistance value of 25r ₁ and the resistance value of the resistor 25r ₂ is set to be equal, the measured value V ₃₂ is the test signal outputted from test signal generating section 20 The value is about half of the voltage Vo.

On the other hand, if a short circuit and the L terminal 111 and the GND terminal 113, since no current flows through the transmission path described above, the resistor 25r no voltage drop due to _1, the test signal outputted from test signal generating section 20 the voltage Vo becomes as a measured value _{V 32.}

Therefore, when the measured value V ₃₂ when the switching element 25 is turned on is equal to or greater than a predetermined value at which a short circuit between the L terminal 111 and the GND terminal 113 can be detected, it is possible to detect a leakage. Hereinafter, this predetermined value is referred to as a threshold value _VSH2 .

Threshold _{V SH2} is expected errors of the resistor _25r 1, 25r ₂ of the resistance value, the voltage should appear between the resistor 25r ₁ and the resistor 25r ₂ if the L terminal 111 and the GND terminal 113 are short-circuited It is desirable to set a higher value. For example, the threshold value _{V SH2,} the L terminal 111 and the GND terminal 113 and a voltage to appear between the resistor 25r ₁ when short-circuited with resistors 25r _2, the test signal output from test signal generator 20 An average voltage value with the voltage Vo can be set. The voltage value of the average, when the resistance value of the resistor 25r ₁ of the resistance value and resistor 25r ₂ are equal, is 75% of the value of the voltage Vo of the test signal output from test signal generator 20.

  FIG. 8 shows a circuit configuration example of the vehicle charging device 1 shown in FIG. 4, in which the control unit 30 outputs a command signal to the switching circuit 303 to turn on the switching element 26, and the N terminal 112 and the GND terminal 113 It is a figure which shows the transmission path | route of the test | inspection signal of the test | inspection signal generation part 20 when a short circuit is carried out with a thick line.

At this time, the inspection signal output from the inspection signal generator 20 includes the wiring 201, the switching element 26, the wiring 261, the resistor 26 r ₁ , the wiring 262, the resistor 26 r ₂ , the wiring 263, the wiring 222, and the second electric wire 132. , N terminal 112, GND terminal 113, third electric wire 133, and wiring 202 are circulated.

In this case, the measured value V 33 obtained by the voltmeter ₃₃ is divided into the resistor 26r ₁ and the resistor 26r ₂ because the voltage Vo of the test signal output from the test signal generator 20 is divided into the resistance 26r ₁ . a voltage value corresponding to the ratio of the resistance value and the resistance value of the resistor 26r _2. In this embodiment, the resistor because the resistance value of 26r ₁ and the resistance value of the resistor 26r ₂ is set to be equal, the measured value V ₃₂ is the test signal outputted from test signal generating section 20 The value is about half of the voltage Vo.

On the other hand, if a short circuit and the N terminal 112 and the GND terminal 113, since no current flows through the transmission path described above, the resistor 26r no voltage drop due to _1, the test signal outputted from test signal generating section 20 The voltage Vo becomes the measured value _V33 as it is.

Therefore, when the measured value V ₃₃ when the switching element 26 is turned on is equal to or greater than a predetermined value at which a short circuit between the N terminal 112 and the GND terminal 113 can be detected, it is possible to detect a leakage. Hereinafter, this predetermined value is referred to as a threshold value _VSH3 .

Threshold _{V SH3} is expected errors of the resistor _26r 1, 26r ₂ of the resistance value, the voltage to appear between the case where the N terminal 112 and the GND terminal 113 is short-circuited with resistors 26r ₁ and the resistor 26r ₂ It is desirable to set a higher value. For example, the threshold value _{V SH3,} and voltage to appear between the resistor 26r ₁ and the resistor 26r ₂ when the N terminal 112 and the GND terminal 113 are shorted, the test signal output from test signal generator 20 An average voltage value with the voltage Vo can be set. The voltage value of the average, when the resistance value of the resistance value and resistor 26r ₂ resistor 26r ₁ are equal, is 75% of the value of the voltage of the test signal output from test signal generator 20.

(C terminal 114 and P terminal 115 short circuit and leakage detection method)
Next, a method in which the control unit 30 detects a short circuit (leakage) between the C terminal 114 and the GND terminal 113 of the charging connector 11 and a short circuit between the C terminal 114 and the P terminal 115 will be described.

  FIG. 9 shows a circuit configuration example of the vehicle charging device 1 shown in FIG. 4 in which a circuit around the C terminal 114 and the P terminal 115 is added and the C terminal 114 and the GND terminal 113 are short-circuited. It is a figure which shows the path | route of the output current of the direct current power supply 34 of a thick line.

As shown in FIG. 9, the apparatus main body 10 further includes a switching element 28, a resistor 28 r, and a voltmeter 35. Further, the charging gun 12, resistor 12r ₁ and resistor 12r ₂ is incorporated.

  The switching element 28 is turned on or off by the switching circuit 303 of the control unit 30, the input side is connected to the DC power supply 34, and the output side is connected to one end of the resistor 28r. The other end of the resistor 28r is connected to the wiring 281. The wiring 281 is connected to the terminal 10 g connected to the fourth electric wire 134 of the charging cable 13.

The voltmeter 35 is configured to detect the voltage of the wiring 281 and output the result to the control unit 30. Since the wiring 281 is connected to the C terminal 114 of the charging connector 11 via the terminal 10g and the fourth electric wire 134, the voltmeter 35 measures the voltage of the C terminal 114. Hereinafter, the measured value _{V 35} of the voltage of the wiring 281 is detected (voltage of C terminal 114) by the voltmeter 35.

Resistor 12r ₁ has one end connected to the P terminal 115 of the charging connector 11 and the other end connected to one end of the resistor 12r _2. The other end of the resistor 12 r ₂ is connected to the third electric wire 133 of the charging cable 13 inside the charging gun 12. Further, in parallel with the resistor 12r _2, switch 121 interlocked with the release button 120 (shown in FIG. 1) is connected. The switch 121 is a normally closed switch that is opened when the release button 120 is pressed and closed when the release button 120 is not pressed.

In this embodiment, the resistance value of the resistor 28r is 1 k [Omega, resistance of the resistor 12r ₁ is 150 ohms, the resistance value of the resistor 12r ₂ is set to 330 ohms.

  When the control unit 30 detects a short circuit between the C terminal 114 and the GND terminal 113 of the charging connector 11 and a short circuit between the C terminal 114 and the P terminal 115, the switching circuit 303 of the control unit 30 turns on the switching element 28. Based on the voltage detection result of the voltmeter 35 in this state, a short circuit between the C terminal 114 and the GND terminal 113 and a short circuit between the C terminal 114 and the P terminal 115 and the GND terminal 113 are detected.

When the C terminal 114 and the GND terminal 113 are short-circuited, as shown by a thick line in FIG. 9, the current output from the DC power supply 34 is changed to the switching element 28, the resistor 28r, the wiring 281, the fourth electric wire 134, C The terminal 114, the GND terminal 113, the third electric wire 133 of the charging cable 13, the wiring 231, and the third electric wire 143 of the power cable 14 are grounded. In this case, the measured value _V35 is the ground potential (0V). Therefore, if the measured value _V35 is substantially 0V (for example, less than 1V), it can be determined that the C terminal 114 and the GND terminal 113 are short-circuited.

  FIG. 10 is a diagram showing the path of the output current of the DC power supply 34 when the C terminal 114 and the P terminal 115 are short-circuited in the circuit configuration example shown in FIG.

When the C terminal 114 and the P terminal 115 are short-circuited, as shown by the thick line in FIG. 10, the current output from the DC power supply 34 is changed to the switching element 28, the resistor 28r, the wiring 281, the fourth electric wire 134, C The terminal 114, the P terminal 115, the resistor 12 r ₁ , the switch 121 (closed state), the third electric wire 133 of the charging cable 13, the wiring 231, and the third electric wire 143 of the power cable 14 are grounded. In this case, the voltage detected by the voltmeter 35, the output voltage (12V) voltage of the resistor 28r resistor 12r ₁ and half pressurized resistor 12r ₁ side of the DC power source 34.

In this embodiment, since the resistance value of the resistor 28r is 1 k [Omega, resistance of the resistor 12r ₁ is a 150 ohms, the voltage appearing on line 281, a 12 × 150 / (1000 + 150 ) ≒ 1.57V. Therefore, if the voltage of the wiring 281 (C terminal 114) detected by the voltmeter 35 is about the voltage value (for example, 1 to 2 V) according to the above arithmetic expression, the C terminal 114 and the P terminal 115 are short-circuited. Can be determined.

Therefore, if the measured value V ₃₅ is less than a predetermined value (2 V in the above example) that can detect that the C terminal 114 and the P terminal 115 are short-circuited, the C terminal 114 and the GND terminal 113 or the C terminal 114. It can be determined that the P terminal 115 is short-circuited. Hereinafter, this predetermined value is referred to as a threshold value _VSH5 .

(Operation of vehicle charging device 1)
Next, the operation sequence of the vehicle charging device 1 will be described with reference to the flowcharts of FIGS. Note that the operation sequence shown in this flowchart is an example of processing performed by the control unit 30, and does not limit the technical scope of the present invention.

  FIG. 11 is a flowchart showing an overall outline of a processing procedure executed by the control unit 30.

  When the plug 140 is fitted into the outlet C and power is supplied to the apparatus body 10 via the power cable 14, the control unit 30 (CPU 301) starts operation based on a program stored in advance in the storage unit 302. To do. After executing the predetermined self-diagnostic program, the control unit 30 executes the processing of the flowchart shown in FIG.

First, the control unit 30 determines whether or not the charging connector 11 is fitted to the input connector 91 of the vehicle 9 and whether or not the L terminal 111 and the N terminal 112 are short-circuited. Processing (step S10) is executed. The result of this process, if it is determined that the fitted engagement flag F ₁ is turned on, engaging the flag F ₁ is turned off to be determined to be fitted. Further, if it is determined that the short circuit, short-circuit flag F ₂ is turned on, if it is determined that the short fitting flag F ₂ is turned off. Details of the fitting and short-circuit determination processing will be described later.

Next, the control unit 30, if fitted flag _{F 1} is long on (step S11: Yes), then turns on the relay 21 and the relay 22, turns on the lamp 151 which indicates that it is a chargeable state ( Step S12). When the relays 21 and 22 are turned on, the charging current output circuit 101 can output the charging current to the vehicle 9.

  The start and end of charging of the storage battery 96 of the vehicle 9 are controlled by the charging control device 95 of the vehicle 9. The control unit 30 monitors the current amount Ic of the charging current flowing through the wiring 212 or 222 using a current sensor (not shown). If the current amount Ic is equal to or greater than the threshold value Is (step S13: Yes), charging is in progress. Is turned on (step 14). Thereafter, when the charging is completed and the charging current Ic becomes less than the threshold value Is (step S15: Yes), the lamp 152 is turned off and the relay 21 and the relay 22 are turned off (step S16). finish.

On the other hand, if the fitting flag _{F 1} is OFF (step S11: No), the control unit 30, if a short circuit flag _{F 2} is turned on (step S17: Yes), the notification of abnormality by blinking the lamp 153 (Step S18), the process is terminated without turning on the relays 21 and 22.

The control unit 30, if a short circuit flag _{F 2} is turned off (step S17: No), determines the electric leakage determination process whether leakage of the L terminal 111 and the N terminal 112 is generated (steps S20) Run. The result of this process, if it is determined that the leakage is leakage flag F ₃ is turned on, the electric leakage is leakage flag F ₃ to be detected is turned off. Details of this leakage detection process will be described later.

Control unit 30, if the leakage flag _{F 3} is turned on (step S21: Yes), the lamp 153 is blinked to notify an abnormality (step S22), and without having to turn on the relays 21 and 22, handle finish.

On the other hand, the control unit 30, if the leakage flag _{F 3} off (step S21: No), short-leakage determination process determines whether the short-circuit or earth leakage in the C terminal 114 and the P terminal 115 has occurred ( Step S30) is executed. The result of this process, if a short circuit or electric leakage is detected, the short circuit current leakage flag F ₄ is turned on, shorting leakage flag F ₄ if the short circuit or ground fault is not detected is turned off. Details of this short circuit and leakage detection process will be described later.

Control unit 30, if a short circuit ground fault flag _{F 4} is turned on (step S31: Yes), the lamp 153 is blinked to notify an abnormality (step S32), without turning on the relay 21, the processing Exit.

On the other hand, if a short circuit ground fault flag F ₄ has not been turned off (step S31: No), without other processing, and ends the series of processes.

(Charging connector fitting judgment process)
Next, the contents of the charging connector fitting determination process (step S10) will be described in detail.

  FIG. 12 is a flowchart illustrating a procedure of charging connector fitting determination processing executed by the control unit 30.

  The control unit 30 first generates a test signal by the test signal generation unit 20 (step S101), and turns on the switching element 24 and the switching element 27 (the other switching elements 25, 26, and 28 are off) (step S102). .

Next, the control unit 30 determines whether or not the measured value V ₃₁ (the voltage at the N terminal 112) based on the detection result of the voltmeter 31 is within a predetermined range (V _SL or more and V _SH or less) (Step S30). S103).

If the measured value _{V 31} is within the predetermined range (S103: Yes), the control unit 30 turns on the mating flag _{F 1,} to turn off the short-circuit flag _{F 2} (step S104). When the measured value V ₃₁ is not within the predetermined range (S103: No), the control unit 30 determines whether or not the measured value V ₃₁ is higher than V _SH (step S105). If the measured value _{V 31} is higher than _{V SH} (S105: Yes), the control unit 30 turns off the mating flag _{F 1,} to turn on the short-circuit flag _{F 2} (step S106). If the measured value _{V 31} is equal to or less than _{V SH} (S105: No), the control unit 30 to both turn off fitting flag _{F 1} and short-circuit flag _{F 2} (step S107).

  Next, the control part 30 turns off the switching elements 24 and 27 (step S108), and complete | finishes a charging connector fitting determination process (step S10).

(Leakage determination processing)
Next, the details of the leakage determination process (step S20) will be described in detail.

  FIG. 13 is a flowchart illustrating a procedure of a leakage determination process executed by the control unit 30.

  The control unit 30 turns on the switching element 25 (the other switching elements 24, 26, 27, and 28 are off) while the inspection signal generation unit 20 is generating the inspection signal (step S201).

Next, the control unit 30 determines whether or not the measured value V ₃₂ (the voltage between the resistor 25r ₁ and the resistor 25r ₂ ) based on the detection result of the voltmeter 32 is equal to or higher than the threshold value V _SH2 (Step _S30 ). S202).

If the measured value _{V 32} is the threshold value _{V SH2} or more (S202: Yes), the control unit 30 turns off the switching element 25 to turn on the switching element 26 (step S203).

Next, the control unit 30 determines whether or not the measured value V ₃₃ (the voltage between the resistor 26r ₁ and the resistor 26r ₂ ) based on the detection result of the voltmeter 33 is equal to or higher than the threshold value V _SH3 (step _S30 ). S204).

Measured value _{V 33} is the threshold value _{V SH3} or more (S204: Yes) when it, the control unit 30 turns off the leakage flag _{F 3} (step S205). On the other hand, if the measured value _{V 32} is less than the threshold value _{V SH2} (S202: No), or if the measured value _{V 33} is less than the threshold value _{V SH3} (S204: No), the control unit 30, on the earth leakage flag _{F 3} (Step S206).

  Next, the control unit 30 turns off the switching element 26 (step S207), and ends the leakage determination process (step S20).

(Short-circuit / leakage determination processing)
Next, the details of the short circuit / leakage determination process (step S30) will be described in detail.

  FIG. 14 is a flowchart illustrating a procedure of a short circuit / leakage determination process executed by the control unit 30.

  The control unit 30 turns on the switching element 28 (the other switching elements 24 to 27 are off) (step S301).

Next, the control unit 30 determines whether or not the measured value V ₃₅ (the voltage at the C terminal 114) based on the detection result of the voltmeter 35 is equal to or higher than the threshold value V _SH5 (step S302).

When the control section 30 measured _{V 35} is the threshold value _{V SH5} more (S302: Yes), to turn off the short-circuit leakage flag _{F 4} (step S303), whereas, the measured value _{V 35} is less than the threshold value _{V SH5} If (S302: No), to turn on the short-circuit leakage flag _{F 4} (step S304).

  Next, the control unit 30 turns off the switching element 28 (step S305) and ends the short circuit / leakage determination process (step S30).

(Operation and effect of the embodiment)
According to the embodiment described above, the following operations and effects can be obtained.

(1) In the present embodiment, the charging current output circuit is provided on the condition that the voltage measured by the first voltage measuring unit 105 during the output of the test signal by the first test signal output circuit 102 is within a predetermined range. 101 can output a charging current. As a result, it is possible to start charging after determining whether a short circuit or leakage has occurred in the charging connector 11 before starting charging. That is, since it is determined whether or not the charging connector 11 is fitted to the input connector 91 of the vehicle 9 based on the inspection signal output from the inspection signal generator 20, the charging of the vehicle 9 becomes possible. High voltage (charging voltage) does not appear at the L terminal 111 and the N terminal 112 in a state in which 11 is not fitted, and safety is improved.

(2) Since the inspection signal includes an AC component and detects the fitting of the charging connector 11 based on a change in impedance due to the capacitance of the first capacitor 41 in the filter circuit 92 of the vehicle 9, The accuracy of determination of non-fitting is increased.

(3) If the frequency of the alternating current component of the inspection signal is set from 100 Hz to 1 kHz, it is possible to accurately determine the fitting or non-fitting of the charging connector 11 for many vehicle types.

(4) When the L terminal 111 and the N terminal 112 are leaking, the abnormality is notified by the blinking of the lamp 153, so that the occurrence of the leak can be notified to the user.

(5) When the short circuit between the C terminal 114 and the P terminal 115 or the leakage of the C terminal 114 occurs, the abnormality is notified by the blinking of the lamp 153, so that the occurrence of the abnormality is notified to the user. be able to.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  For example, in the above embodiment, the abnormality is notified by the blinking of the lamp 153. However, the present invention is not limited to this, and the abnormality may be notified by a warning sound. Alternatively, the abnormality may be notified by transmitting a signal indicating that an abnormality has occurred in another device through communication.

1 ... vehicular charging device, 10 ... apparatus body, 10A-10G ... terminal, 11 ... charging connector 12 ... charging gun, _12r 1, 12r 2 _... resistors, 13 ... charging cable, 14 ... power cable, 15 ... indicator , 20 ... inspection signal generator, 21, 22 ... relay, 24 to 28 ... switching element, 25r ₁ , 25r ₂ , 26r ₁ , 26r ₂ , 27r, 28r ... resistor, 30 ... controller, 31, 32, 33 35 ... Voltmeter 34 ... DC power supply 41-45 ... first to fifth capacitors 46,47 ... coil 90 ... vehicle body 91 ... input connector 92 ... filter circuit 93 ... inrush current limiting circuit 94 ... rectifier circuit, 95 ... charge control device, 96 ... storage battery, 97 ... inverter, 98 ... electric motor, 99 ... reduction gear, 100 ... vehicle charging system, 101 ... charge current output Circuit 102 first test signal output circuit 103 second test signal output circuit 104 third test signal output circuit 105 first voltage measuring unit 106 second voltage measuring unit 107: third voltage measuring unit, 110: housing, 111 ... L terminal, 112 ... N terminal, 113 ... GND terminal, 114 ... C terminal, 115 ... P terminal, 120 ... release button, 120a ... engagement protrusion, 121 Switch, 131-132 ... 1st-3rd electric wire, 140 ... Plug, 140a-140c terminal, 140a, 140b, 140c ... Terminal, 141-143 ... 1st-3rd electric wire, 151-153 ... Lamp, 201,202,212,221,222,231,241,251,252,253,261,262,263,271,272,273,281,311,321 331, 401, 402, 403, 404, 405, 406, 407 ... wiring, 302 ... storage unit, 303 ... switching circuit, 901 ... front wheel, 902 ... rear wheel, 911 ... first input terminal, 912 ... second input terminal 913: Ground terminal, C: Outlet

Claims (4)

A vehicle charging device comprising a charging connector having a pair of output terminals, a charging cable connected to the charging connector, and a device main body for charging the vehicle via the charging cable,
The apparatus main body is
A charging current output circuit for outputting a charging current to the vehicle from the pair of output terminals;
An inspection signal generator for generating an inspection signal including an AC component;
A first inspection signal output circuit that outputs the inspection signal from one output terminal of the pair of output terminals;
A first voltage measuring unit that measures the voltage of the other output terminal of the pair of output terminals;
A second inspection signal output circuit for outputting the inspection signal from the one output terminal via a plurality of resistors;
A second voltage measuring unit for measuring a voltage between the plurality of resistors of the second inspection signal output circuit;
The output of the charging current by the charging current output circuit is performed on condition that the voltage measured by the first voltage measuring unit is within a predetermined range during the output of the inspection signal by the first inspection signal output circuit. A control unit that enables,
The control unit reports an abnormality when the voltage measured by the second voltage measurement unit is greater than or equal to a predetermined value during the output of the test signal by the second test signal output circuit.
Vehicle charging device. A vehicle charging device comprising a charging connector having a pair of output terminals, a charging cable connected to the charging connector, and a device main body for charging the vehicle via the charging cable,
The apparatus main body is
A charging current output circuit for outputting a charging current to the vehicle from the pair of output terminals;
An inspection signal generator for generating an inspection signal including an AC component;
A first inspection signal output circuit that outputs the inspection signal from one output terminal of the pair of output terminals;
A first voltage measuring unit that measures the voltage of the other output terminal of the pair of output terminals;
A third inspection signal output circuit for outputting the inspection signal from the other output terminal via a plurality of resistors;
A third voltage measuring unit for measuring a voltage between the plurality of resistors of the third inspection signal output circuit;
The output of the charging current by the charging current output circuit is performed on condition that the voltage measured by the first voltage measuring unit is within a predetermined range during the output of the inspection signal by the first inspection signal output circuit. A control unit that enables,
The control unit reports an abnormality when the voltage measured by the third voltage measurement unit during output of the inspection signal by the third inspection signal output circuit is equal to or greater than a predetermined value.
Vehicle charging device. The inspection signal generated by the inspection signal generator has a frequency of the AC component of 100 Hz to 1 kHz.
The vehicle charging device according to claim 1 or 2. The vehicle charging device according to any one of claims 1 to 3,
A storage battery for storing electric power to be supplied to an electric motor that generates driving force for vehicle travel;
An input connector having a pair of input terminals for receiving the charging current to the storage battery;
A filter circuit including a capacitor provided between the input connector and the storage battery and connected between the pair of input terminals;
A vehicle charging system comprising:

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