WO2017061188A1

WO2017061188A1 - Vehicle-mounted charging device

Info

Publication number: WO2017061188A1
Application number: PCT/JP2016/074971
Authority: WO
Inventors: 修武井; 鳥羽　章夫; 八須　康明; 政和鷁頭; 西田　廣治
Original assignee: 富士電機株式会社
Priority date: 2015-10-08
Filing date: 2016-08-26
Publication date: 2017-04-13

Abstract

Provided is a vehicle-mounted charging device which does not need continuous monitoring of a voltage detection value or a complicated calculation process, does not make a dedicated voltage sensor redundant, and enables an abnormality in a voltage detecting means to be simply estimated. This vehicle-mounted charging device which converts, to an AC voltage, a DC voltage obtained by rectifying an AC power supply voltage by using an inverter comprising switching elements 201-204, and converts this AC voltage to a DC voltage through a transformer 205 and a rectifying circuit 208 to supply the DC voltage to a battery 700, said vehicle-mounted charging device being provided with an output voltage detecting means 604 for detecting the output voltage, wherein a communication/abnormality estimating means 800 is provided which estimates an abnormality of the output voltage detecting means 604, when the difference between a voltage detection value V_O detected by the output voltage detecting means 604 and a voltage detection value V_B of the battery 700 exceeds a preset threshold value.

Description

In-vehicle charger

The present invention relates to an in-vehicle charging device having a function of estimating an abnormality of output voltage detecting means.

FIG. 3 shows a vehicle drive device for an electric vehicle or a hybrid vehicle described in Patent Document 1.
In FIG. 3, 1 is a battery, 2 and 4 are capacitors, 3 is a boost converter, 5 is an inverter, 6 is a control device, 7 is a voltage sensor for detecting the voltage of the battery 1, and 8 is an input voltage (capacitor) of the boost converter 3. 2 is a voltage sensor for detecting the output voltage of the boost converter 3 (the voltage of the capacitor 4), and 10 is a current sensor for detecting a direct current flowing between the battery 1 and the boost converter 3. , 11u, 11v, 11w are current sensors for detecting each phase current of the motor generator MG for driving the vehicle.

In this vehicle drive device, during powering operation, the boost converter 3 boosts the voltage of the battery 1 and supplies it to the inverter 5, and the inverter 5 supplies the AC power obtained by DC / AC conversion to the motor generator MG. Make it work. Further, during regenerative operation, AC power of motor generator MG that operates as a generator is regenerated to battery 1 via inverter 5 and boost converter 3.
These operations are executed by the control device 6 controlling the boost converter 3 and the inverter 5 based on the voltage detection values and current detection values by the

voltage sensors

7, 8, 9 and the

current sensors

10, 11u, 11v, 11w. Is done.

Here, when the voltage sensor 9 is out of order and the output voltage of the boost converter 3 cannot be accurately detected, for example, the difference between the input and output voltages of the boost converter 3 is much larger than the set value. The situation that operates is generated. In this case, an overcurrent suddenly flows in the boost converter 3, which may cause a failure or destruction of the switching element or the like.

For this reason, in patent document 1, the process which judges the normality / abnormality of the voltage sensor 9 is performed with a fixed period, and specifically, the voltage detection value by the voltage sensor 9 starts over a fixed time after starting control. An abnormality of the voltage sensor 9 is detected based on a phenomenon such as a fixed value or a voltage detection value deviating significantly from a predetermined range.

Next, FIG. 4 shows a vehicle drive device for an electric vehicle or a hybrid vehicle described in Patent Document 2.
In FIG. 4, 21 is a battery, 22 and 25 are capacitors, 23 is a power conversion unit, 24 is a boost converter, 26 and 27 are inverters, 28 is a motor generator controller, 29 is a DC / DC converter, and 30 is an auxiliary battery. , 31 is an auxiliary machine load, 32 is a charging device, 33 is a main control unit, 34 is a power supply control unit, 35 is a voltage sensor that detects the voltage of the

battery

21, 36 is a voltage sensor that detects the input voltage of the

boost converter

24, 37 is a voltage sensor for detecting the output voltage of the

boost converter

24, 38 is a voltage sensor for detecting the output voltage of the

charging device

32, 39 is a charging relay, 40 is an external AC power source, and MG1 and MG2 are motor generators.

Note that the charging device 32 is configured to charge the battery 21 using the AC power supply 40 while the vehicle is stopped, according to a command from the main control unit 33. The charging relay 39 is turned off during traveling and turned on during charging while the vehicle is stopped.

In this vehicle drive device, when the charging device 32 is activated and the battery 21 is charged while the vehicle is stopped, the smoothing capacitor on the output side of the charging device 32 is normally discharged, so that the voltage is almost zero. . Nevertheless, when a constant voltage is detected by the voltage sensor 38, the main control unit 33 determines whether the voltage detection value by the voltage sensor 38 is due to the residual voltage of the smoothing capacitor or due to an abnormality of the voltage sensor 38. Alternatively, it cannot be determined whether the charging relay 39 is broken and stuck in the on state.

Therefore, in Patent Document 2, in order to discriminate between the abnormality of the voltage sensor 38 and the abnormality due to the fixing of the charging relay 39 in particular, the main control unit 33 determines that the voltage detection value V ₃₈ by the voltage sensor 38 exceeds the first threshold value α. If it has, then calculates the difference between the voltage detection value _{V 35} and the voltage detection value _{V 38} by the voltage sensor 35 of the battery 21 side, the absolute value _| V 35 _{-V 38} | exceeds a second threshold value β When it is determined that the voltage sensor 38 is abnormal, it is determined that the charging relay 39 is stuck when | V ₃₅ −V ₃₈ | is less than the second threshold value β.

Japanese Patent No. 4830345 (paragraphs [0042] to [0049], FIG. 1, FIG. 2, etc.) JP 2012-170286 A (paragraphs [0079] to [0081], FIG. 1, FIG. 9, etc.)

In the prior art described in Patent Document 1, it is necessary to monitor the voltage detection value by the voltage sensor 9 over a certain period of time, and there is a problem that it takes time to determine abnormality.
Moreover, in the prior art described in Patent Document 2, since it is necessary to compare with a plurality of threshold values α and β, the calculation processing is complicated.
In general, when verifying normality / abnormality of a voltage sensor or the like, it is conceivable to attach a plurality of sensors to the same detection site and compare the detection values of these plurality of sensors. Cost increases associated with redundant sensors, restrictions on sensor mounting location, and the like become problems.

Accordingly, the problem to be solved by the present invention is that the vehicle does not require continuous monitoring of the voltage detection value or complicated calculation processing, and can easily estimate the abnormality of the output voltage detection means without making the sensor redundant. It is providing a type charging device.

In order to solve the above-mentioned problem, the invention according to claim 1 converts a DC voltage obtained by rectifying an AC power supply voltage into an AC voltage, and converts the AC voltage into a DC voltage via a transformer and a rectifier circuit to thereby convert the battery. In the in-vehicle charging device provided with the output voltage detecting means for detecting the output voltage of the charging device,
And an abnormality estimating means for estimating an abnormality of the output voltage detecting means when a difference between a voltage detected value by the output voltage detecting means and a terminal voltage equivalent value of the battery exceeds a preset threshold value. .

According to a second aspect of the present invention, in the in-vehicle charging device according to the first aspect, the terminal voltage equivalent value is a voltage detection value by a voltage sensor for detecting a terminal voltage of the battery. .

The invention according to claim 3 is characterized in that, in the in-vehicle charging apparatus according to claim 1, the terminal voltage equivalent value is a terminal voltage command value of the battery included in an external controller.

In addition, as described in claim 4, the threshold value may be set to a value in consideration of a voltage drop in a path from the charging device main body to the battery.

According to the present invention, there is no need for continuous monitoring of the voltage detection value and complicated calculation processing, and there is no need to install a plurality of dedicated voltage sensors for abnormality detection, and the output voltage detection means Can be estimated easily and at low cost.

1 is an overall configuration diagram of an in-vehicle charging apparatus according to an embodiment of the present invention. It is a schematic block diagram of the principal part in embodiment of this invention. 1 is a configuration diagram of a vehicle drive device described in Patent Document 1. FIG. It is a block diagram of the vehicle drive device described in patent document 2.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, FIG. 1 is an overall configuration diagram of an in-vehicle charging device according to this embodiment. In FIG. 1, 100 is a power factor correction circuit, 300 is its control circuit, 200 is a DC-DC conversion circuit, 500 is its control circuit, and 800 communicates with an external main controller and battery controller to be described later. And communication / abnormality estimation means for estimating an abnormality of the output voltage detection means.

The power factor correction circuit 100 includes a lightning surge countermeasure circuit 102 connected to an AC power source 101, an input filter circuit 103, a relay 104 for preventing inrush current, a reactor 105,

diodes

106 and 108, and a semiconductor switching element 110. , 111,

shunt resistors

112 and 113, a capacitor 114, and a series circuit of a resistor 115 and a semiconductor switching element 116.
A DC intermediate capacitor 117 is connected in parallel to the series circuit of the resistor 115 and the semiconductor switching element 116, and a DC-DC conversion circuit 200 is connected to both ends thereof.

The DC-DC conversion circuit 200 includes a full-bridge inverter composed of semiconductor switching elements 201 to 204 connected to both ends of a capacitor 117, a transformer 205 and a resonance capacitor connected in series between the AC terminals, A rectifier circuit 208 connected to the secondary side, a capacitor 210 and a shunt resistor 209a connected in series between its output terminals, a resistor 211, a semiconductor switching element 212, and a shunt resistor 209b connected to both ends of the capacitor 210. A pair of outputs connected to both ends of the capacitor 216, including a series circuit, and a DC

filter including reactors

213 and 215 and

capacitors

214 and 216 connected to both ends of the series circuit of the resistor 211 and the semiconductor switching element 212. Terminal 217 is connected to the battery (see FIG. It is adapted to be connected to a reference) to.
Here, the transformer 205 is a step-up transformer that steps up the voltage on the primary side and supplies it to the secondary side.

The communication / abnormality estimation means 800 communicates with the main controller and the battery controller by CAN communication or the like, receives various commands from the main controller and receives the battery voltage detection value V from the battery controller, as will be described later. _B is received. Further, the communication / abnormality estimation unit 800 receives an output voltage detection value V _O from an output voltage detection unit 604 described later, and transmits an activation signal and an output voltage command value to the control circuit 500 described later. Further, the communication / abnormality estimation unit 800 performs the abnormality estimation process of the output voltage detection unit 604.

On the power factor correction circuit 100 side, an input voltage detection means 401, an input current detection means 402, a bulk voltage detection means 403, an overcurrent detection means 404, and an overvoltage detection means 405 are provided, and the detection values by these detection means are controlled. Input to the circuit 300. Note that each of the detection means 401 to 405 is configured by hardware or software.
A relay drive circuit 406, a gate drive circuit 407, and a discharge control circuit 408 are connected to the control circuit 300, and the relay 104 and the

switching elements

110, 111, and 116 are operated by drive signals or control signals output from these circuits, respectively. It is supposed to be.
In addition, a start signal is input to the control circuit 300 from the control circuit 500 via the start circuit 607.

In the power factor correction circuit 100, the control circuit 300 switches the switching elements 110 and 111 via the gate drive circuit 407 so that the input power factor becomes 1 based on the detection values by the input voltage detection unit 401 and the input current detection unit 402. However, since the configuration and operation thereof are not the gist of the present invention, detailed description thereof is omitted.

On the other hand, a gate drive circuit 601, primary current detection means 602, secondary current detection means 603, and output voltage detection means 604 are provided on the DC-DC conversion circuit 200 side. These detection means 602 to 604 are also configured by hardware or software.
The detection values by the detection means 602 and 603 and the output voltage of the rectifier circuit 208 are input to the abnormality detection circuit 605 together with the output signal (PWM pulse) from the control circuit 500, and the output signal of the abnormality detection circuit 605 is output voltage detection. This is input to the control circuit 500 together with the detection value by the means 604. In addition, a discharge control circuit 606 for controlling the switching element 212 is connected to the control circuit 500.

Further, the output signal of a current transformer (insulated current sensor) 207 provided on the primary side of the transformer 205 is input to the primary side current detection unit 602, and the secondary side current detection unit 603 receives the rectification. Output signals of shunt resistors (non-insulated current sensors) 209a and 209b provided on the negative line of the circuit 208 are input.

Here, the control circuit 500 switches the switching elements 201 to 204 of the DC-DC conversion circuit 200 so that the voltage detection value by the output voltage detection means 604 matches the output voltage command value from the communication / abnormality estimation means 800. ON / OFF control.
The current transformer 207 is provided to determine whether or not the primary current of the transformer 205 is within a predetermined range. Furthermore, the shunt resistor 209a is provided to determine whether or not the secondary current of the transformer 205 matches the command value, and the shunt resistor 209b connects the capacitor 210 charged to a constant voltage to turn on the switching element 212. It is provided for detecting the discharge current when discharged by the above and mainly detecting abnormality of the capacitor 210.

In the above configuration, if there is an abnormality in the output voltage detection means 604, whether or not the voltage actually output from the in-vehicle charging device matches the output voltage command value from the communication / abnormality estimation means 800. Is unknown. Since the control circuit 500 feeds back a voltage detection value from the output voltage detection means 604 and controls on / off of the switching elements 201 to 204 of the DC-DC conversion circuit 200, when the output voltage detection means 604 is abnormal, There is a possibility that an excessively small voltage may be output, and the battery (see FIG. 2) may be damaged without performing an appropriate charging operation.

Therefore, in this embodiment, the abnormality of the output voltage detection unit 604 is estimated as follows.
First, FIG. 2 is a configuration diagram schematically showing an application example of the communication / abnormality estimation means 800 in the present embodiment. In FIG. 2, 1000 is a main controller, 850 is a communication path for performing CAN communication, and 900 is a battery controller.
The charging device main body 600 corresponds to the entire circuit excluding the AC power supply 101 from FIG. 1, and the output terminal 217 of the internal DC / DC conversion circuit 200 is connected via a charging cable 218 and a relay 219 as shown in FIG. The battery 700 to be charged is connected.

The battery 700 is provided with a voltage sensor 701 that detects a terminal voltage thereof, and a battery voltage detection value V _{B obtained} by the voltage sensor 701 is input to the battery controller 900. The battery controller 900 receives a battery relay ON command from the main controller 1000, transmits the battery voltage detection value V _B to the communication / abnormality estimation means 800, and can output a relay drive signal for the relay 219. ing.
Communication / abnormality estimation means 800 receives a start command, output voltage command command, battery relay ON command from main controller 1000, battery voltage detection value V _B from battery controller 900, and output voltage detection value V _O from output voltage detection means 604. Are received respectively.

The abnormality estimation of the output voltage detection means 604 in the communication / abnormality estimation means 800 is performed as follows, for example.
When the start command and the battery relay ON command received from the main controller 1000 are valid, the output voltage detection means when the difference between the output voltage detection value V _O and the battery voltage detection value V _B exceeds a predetermined threshold value. Estimate that 604 is abnormal. Here, the threshold value may be set to a value in consideration of a voltage drop in a path from the charging device main body 600 (output terminal 217) to the battery 700.
Also, if the start command is disabled (stopped), if the output voltage detection value V _O which should approximately equal to 0 in the normal exceeds a predetermined threshold value, the output voltage detecting unit 604 estimates that there is an abnormality.
The functions of the communication / abnormality estimation unit 800 may be mounted on the charging device main body 600, or may be mounted on the main controller 1000, the battery controller 900, or other devices.

As described above, according to this embodiment, the abnormality of the output voltage detecting means 604 can be easily estimated, and a plurality of dedicated voltage sensors for detecting an abnormality are provided and made redundant at a low cost. The reliability of the vehicle-mounted charging device can be confirmed.

100: Power factor correction circuit 101: AC power supply 102: Lightning surge countermeasure circuit 103: Input filter circuit 104: Relay 105: Reactor 106, 108: Diodes 110, 111, 116: Semiconductor switching elements 112, 113: Shunt resistors 114, 117 : Capacitor 115: Resistor 200: DC-

DC converter circuit

201, 202, 203, 204, 212: Semiconductor switching element 205: Transformer 207: Current transformer 208:

Rectifier circuit

209a, 209b:

Shunt resistor

210, 214, 216: Capacitor 211: resistors 213, 215: reactor 217: output terminal 218: charging cable 219: relay 300, 500: control circuit 401: input voltage detecting means 402: input current detecting means 403: bulk voltage detecting means 404: overcurrent detecting means 40 : Overvoltage detection means 406: Relay drive circuit 407: Gate drive circuit 408: Discharge control circuit 600: Charger body 601: Gate drive circuit 602: Primary side current detection means 603: Secondary side current detection means 604: Output voltage detection Means 605: Abnormality detection circuit 606: Discharge control circuit 607: Start-up circuit 700: Battery 701: Voltage sensor 800: Communication / abnormality estimation means 850: Communication path 900: Battery controller 1000: Main controller

Claims

An in-vehicle charging device that converts a DC voltage obtained by rectifying an AC power supply voltage into an AC voltage, converts the AC voltage into a DC voltage via a transformer and a rectifier circuit, and supplies the DC voltage to the battery. In the in-vehicle charging device provided with the output voltage detecting means for detecting the output voltage,
An abnormality estimation unit is provided that estimates an abnormality of the output voltage detection unit when a difference between a voltage detection value obtained by the output voltage detection unit and a terminal voltage equivalent value of the battery exceeds a preset threshold value. Car-mounted charging device.
In the on-vehicle charging device according to claim 1,
The vehicle-mounted charging device, wherein the terminal voltage equivalent value is a voltage detection value by a voltage sensor for detecting a terminal voltage of the battery.
In the on-vehicle charging device according to claim 1,
The vehicle-mounted charging device, wherein the terminal voltage equivalent value is a terminal voltage command value of the battery included in an external controller.
In the on-vehicle charging device according to any one of claims 1 to 3,
The vehicle-mounted charging device, wherein the threshold value is a value considering a voltage drop in a path from the charging device main body to the battery.