JP6069646B2 - Charger - Google Patents

Description

  The present invention relates to a charging device used for charging a load device controlled by a charging control signal (CPLT signal).

  A load device in which charging control is performed with a CPLT signal (a pilot signal having a duty set according to the magnitude of the rated current) includes a mode 2 type vehicle among vehicles equipped with an in-vehicle battery (for example, Patent Document 1). ), Wheelchairs, electric bicycles, and large storage batteries for power storage. As shown in FIG. 1, a charging device 2 including a control unit 3 that controls opening / closing of the relay 5 based on a CPLT signal is used for charging these load devices 1.

  As shown in FIG. 2, the control unit 3 of the charging device 2 includes a CPLT circuit 4 that generates a CPLT signal, a determination unit 6 that transmits an open / close signal of a charging circuit to the relay 5 based on the CPLT signal, a relay 5 is provided with contact detection means 8 for detecting the open / closed state of the relay 5 based on signals from the voltage detection unit 7 arranged on each of the power supply side and the load side across 5. In addition, the control unit 3 includes a power supply unit 9 having an AC / DC converter built in or adjacent thereto, and a DC current obtained by rectifying an external AC power supply is supplied to the control unit 3.

  As described above, the determination means 6 transmits a charging circuit open / close signal to the relay 5 based on the CPLT signal, and also receives a signal indicating the open / close state of the relay 5 from the contact detection means 8 to match the open / close signal. The state of the relay 5 such as welding determination and non-operation determination is determined, and whether the relay 5 is actually operating with respect to the control of the control unit 3 is monitored. When the operation is not performed, an error is displayed on the display unit 13.

  By the way, in the case where an instantaneous voltage drop (voltage fluctuation of about several tens to several hundreds ms) due to a lightning strike or a sudden increase in power demand occurs in the system power supply that supplies power to the charging device 2, a predetermined amount is set. When the instantaneous voltage drop exceeding the value continues for 10 to 20 ms or more, the relay 5 may not be able to maintain the closed state and may be opened. On the other hand, as described above, the control unit 3 includes the power supply unit 9 having an AC / DC converter, or is provided adjacent to the AC / DC converter. Since the AC / DC converter contains a capacitor component, the instantaneous voltage drop is reduced. Until the duration is about 200 to 300 ms, it is not affected by the instantaneous voltage drop. Therefore, it is assumed that the control unit 3 continuously transmits a charging circuit closing signal to the relay 5 in a state where the instantaneous voltage drop of a predetermined value or more continues for 10 to 20 ms or more and the relay 5 is opened. In such a case, the determination unit 6 performs “non-operation determination” that the relay 5 does not operate with respect to the closing signal.

  In the charging device 2, from the viewpoint of ensuring safety, when the determination unit 6 performs an error determination such as “non-operation determination” or the like, it is not until the error determination release operation is manually performed that the relay 5 is turned on again. It is designed so that it can be closed. For this reason, conventionally, when the “non-operation determination” due to the instantaneous voltage drop is made, the charging is not performed until the error determination is manually canceled even after recovery from the instantaneous voltage drop to the normal voltage state. There was a problem that it was not resumed and was inconvenient.

  FIG. 3 shows a graph showing a change in the potential of the CPLT signal at point A in FIG. 1 when the load device 1 is connected to the charging device 2. The charging device 2 shown in FIG. 1 is designed so that the potential of the CPLT signal at point A of the charging device 2 is 12V when the charging cable is not connected to the load device 1. When the charging cable is connected to the load device 1, the resistance R2 of the charge control circuit 10 on the load device side is connected in series with the resistor R1, so that the voltage is divided and the potential at the point A becomes 9V. The control unit 3 detects that the load device 1 is connected to the charging cable by detecting the potential of 9V, and then the control unit 3 oscillates the oscillator 11 so that the CPLT signal is in a 9V oscillation state. As a result, the pulsed 9V enters the load device side, and the charge control circuit 10 on the load device side turns on the power reception permission switch 12. Here, at the same time as the power reception permission switch 12 is turned on, the potential at the point A changes to 6 V oscillation due to the resistance voltage division of the resistor R3, and the load device side is ready for power reception. In this state, the control unit 3 outputs a closing signal of the charging electric circuit to the relay 5 and applies a charging voltage to the load device 1, so that the battery mounted on the load device side can be charged.

  Here, when the duration of the instantaneous voltage drop continues for a predetermined time (for example, 200 to 300 ms) or longer, the control unit 3 also starts to be affected by the instantaneous voltage drop, the potential of the CPLT signal decreases, and the charging device 2 There is a possibility that an erroneous error determination is made or the charging control of the load device 1 is affected. For example, from the state of 9V oscillation, the charging control circuit 10 on the load device side becomes 6V oscillation before the power reception permission switch 12 is turned on and outputs an ON signal to the relay 5, or in the state of 6V oscillation, There has been a problem that there is a risk of malfunction, for example, the CPLT signal decreases and the charging device 2 determines that the load device 1 is ineligible.

JP 2011-72104 A

  The object of the present invention is to solve the above-mentioned problems, and in a charging device used for charging a load device controlled by a CPLT signal, a technique for avoiding an unexpected malfunction due to the influence of an instantaneous voltage drop and realizing stable charging control Is to provide.

The charging device of the present invention made to solve the above problems includes a control unit including a CPLT circuit that generates a CPLT signal and a determination unit that has a function of transmitting an open / close signal to a relay based on the CPLT signal; And a relay that opens and closes a charging electrical path to a load device by means of an opening / closing signal of the means, wherein the control unit further controls voltage fluctuation of an external power source supplied to the charging device from the outside. A voltage fluctuation detecting means for detecting, a malfunction avoiding means for stopping the relay state determination when the voltage fluctuation detected by the voltage fluctuation detecting means exceeds a threshold value, and a malfunction avoiding means for stopping the generation of the CPLT signal. And one or both of the two malfunction avoiding means are operated according to the duration of the voltage fluctuation detected by the voltage fluctuation detecting means. It is.

In the invention according to claim 2, voltage detectors are respectively arranged on the power supply side and the load side of the charging circuit with the relay interposed therebetween,
The determination means further has a function of receiving a signal indicating the open / close state of the relay from the voltage detection unit, and determining the relay state based on consistency with the open / close signal,
The malfunction avoiding means stops the relay state determination in the determining means.

According to a third aspect of the present invention, the control unit further comprises an avoidance function stopping means for stopping the function of the malfunction avoidance means when the voltage fluctuation detected by the voltage fluctuation detection means recovers within a threshold value. It is a feature.

The invention according to claim 4 is characterized in that the avoidance function stop means restarts the determination of the relay state in the determination means.

The invention described in claim 5 is characterized in that the avoidance function stopping means restarts the generation of the CPLT signal.

In the charging device according to the present invention, a voltage fluctuation detecting unit that detects voltage fluctuation of an external power source supplied from the outside to the charging device and a voltage fluctuation detected by the voltage fluctuation detecting unit set a threshold value in the control unit. And a malfunction avoiding means for stopping the relay state determination and a malfunction avoiding means for stopping the generation of the CPLT signal , and depending on the duration of the voltage fluctuation detected by the voltage fluctuation detecting means. With the configuration in which one or both of the two malfunction avoiding means are operated, an unexpected malfunction due to the influence of the instantaneous voltage drop is avoided, and stable charge control is realized. According to the invention of claim 2, when the instantaneous voltage drops, the determination of the relay state in the judging means can be stopped. According to the invention of claim 3, after the instantaneous voltage drop is restored to the normal voltage state, Charging can continue. According to the invention of claim 4, after recovering from the instantaneous voltage drop to the normal voltage state, the charging can be resumed without separately performing an error determination canceling operation. According to the fifth aspect of the present invention, after recovery from the instantaneous voltage drop to the normal voltage state, charging can be restarted by restarting generation of the CPLT signal.

It is a block diagram of the charging device used for charge of the load apparatus controlled by the conventional CPLT signal. It is a block diagram of the control part in the conventional charging device. It is a graph which shows the change of the electric potential of the CPLT signal of A point of FIG. 1 for every charging condition. It is a block diagram of the charging device used for charge of the load apparatus controlled by the CPLT signal of the present invention. 3 is a block diagram of a control unit in the charging apparatus according to Embodiment 1. FIG. In Embodiment 1, it is a flowchart explaining the charge start control in normal time. In Embodiment 1, it is a flowchart explaining the charge end control in normal time. In Embodiment 1, it is a flowchart explaining the charge control at the time of the threshold value exceeding voltage fluctuation. FIG. 6 is a block diagram of a control unit in the charging device of Embodiment 2. In Embodiment 2, it is a flowchart explaining the charge control at the time of the threshold value exceeding voltage fluctuation.

  Preferred embodiments of the present invention are shown below. The present invention relates to a charging device used for charging a load device controlled by a CPLT signal (a pilot signal having a duty set according to the magnitude of the rated current), and the type of the load device is not particularly limited. In the following embodiment, an example of a vehicle controlled by a CPLT signal (a so-called mode 2 type vehicle) will be described.

  For charging a mode 2 type vehicle, as shown in FIG. 4, a charging device 2 including a control unit that controls opening and closing of the relay 5 based on a CPLT signal is used.

(Embodiment 1)
The control unit 30 of the first embodiment shown in FIG. 5 is similar to the prior art shown in FIG. 2, in addition to the CPLT circuit 4 that generates the CPLT signal, the control circuit 30 for the relay 5 based on the CPLT signal Of the relay 5 based on the measurement result (voltage / no voltage) of the voltage detection unit 7 and the voltage detection unit 7 disposed on each of the power supply side and the load side across the relay 5. Contact detection means 8 for detecting an open / close state. Further, a power supply unit 9 that supplies a direct current obtained by rectifying an external AC power supply to the control unit 30 and a display unit 13 that displays a charge state, an error display, and the like are provided adjacent to the control unit 30. Note that the contact detection unit 8 may determine the open / close state of the relay 5 based on the measurement result of the voltage detection unit 7 by the determination unit 6.

  As shown in FIG. 5, the control unit 30 according to the charging device 2 of the present invention includes a voltage fluctuation detecting unit 14 that detects a voltage fluctuation of an external power supply supplied to the charging apparatus 2 from the outside, and the voltage fluctuation detection. There are provided malfunction avoiding means 15 and 16 for avoiding malfunction of the charging device when the voltage fluctuation detected by the means 14 exceeds a threshold value. The malfunction avoiding means of the present embodiment is composed of a malfunction avoiding means 15 having a function of stopping the determination of the state of the relay 5 in the determining means 6 and a malfunction avoiding means 16 for stopping the generation of the CPLT signal in the CPLT circuit 4. Yes. That is, the malfunction avoiding means 15 avoids contact welding determination and non-operation determination that are not actually generated due to the influence of voltage fluctuation. The malfunction avoiding means 16 avoids that the potential of the CPLT signal decreases due to the influence of the voltage fluctuation and the charging device 2 makes an erroneous error determination or affects the charging control of the vehicle. In addition, the determination unit 6 includes an avoidance function stop unit 17 that restarts the function that has been stopped by the malfunction avoidance units 15 and 16.

  In the present embodiment, the voltage detection of the external power supply in the voltage fluctuation detection means 14 is performed using the voltage value of the power supply unit 9 that supplies power to the control unit 30, but the voltage value on the power supply side of the voltage detection unit 7 is used. It is also possible to use. In the present embodiment, when the voltage fluctuation exceeds a threshold value (for example, ± 30% of the rating), a fluctuation signal is output to the determination means 6, and when the voltage fluctuation falls below the threshold value, a recovery signal is output to the determination means 6. . The detection of the voltage fluctuation corresponds to an instantaneous voltage drop of about 70 to 200 ms.

  The CPLT circuit 4 generates a CPLT signal corresponding to the connection state of the vehicle and outputs it to the determination means 6 at all times, as in the prior art. When the vehicle is not connected, the CPLT signal is adjusted so that the potential of the CPLT signal at point A is 12V constant voltage by the internal resistance R1, and is divided by the vehicle internal resistance R2 to 9V constant voltage when the vehicle is connected. Has been. If the vehicle charging device side is in a chargeable state (when conditions such as no timer control and no contract current problem are satisfied), the CPLT signal is oscillated to generate 9V oscillation. Subsequently, when the charging permission switch 12 on the vehicle side is turned on, it shifts to 6V oscillation due to the partial pressure with R3. In this state, the determination means 6 outputs a closing signal of the charging circuit to the relay 5, a voltage is applied to the charging circuit, and the vehicle battery mounted in the vehicle can be charged (hereinafter referred to as mode 2). Called control).

  As described above, the determination means 6 transmits a charging circuit open / close signal to the relay 5 based on the CPLT signal, and also receives a signal indicating the open / close state of the relay 5 from the contact detection means 8 to match the open / close signal. The state of the relay 5 as shown in Table 1 is always determined.

  As shown in FIG. 6, in this embodiment, after the start of mode 2 control, the state is determined before the relay 5 is closed. Here, as shown in the state a of Table 1, the relay 5 is sandwiched between the power source side and the power source side. The measurement result of the voltage detection unit 7 arranged on each load side is a voltage on the power source side and no voltage on the load side in a state where a closing circuit signal of the charging circuit is transmitted from the determination means 6 to the relay 5. If it is, it is determined that the relay 5 is not welded and is in a normal state. If it is determined that the relay 5 in the state of voltage b on the power supply side and voltage on the load side is welded, the CPLT signal is not oscillated, the mode 2 control is stopped, and the display unit 13 An error is displayed.

  If it is determined in the state determination before the relay 5 is closed that the relay 5 is in a normal state, the relay 5 is subsequently closed through mode 2 control. That is, when the CPLT signal shifts to 6V, the determination unit 6 transmits a closing signal of the charging circuit to the relay 5. Thereafter, the measurement results of the voltage detectors 7 arranged on the power supply side and the load side across the relay 5 are transmitted to the determination means 6 via the contact detection means 8, and the state determination of the relay 5 is performed. At this time, as shown in the state c of Table 1, when the measurement result of the voltage detection unit 7 is a voltage on both the power supply side and the load side, the relay 5 is operated by the closing signal and is normal. It is determined that it is in a state. If the power supply side has a voltage and the load side has no voltage as shown in state d after transmitting the closing signal, it is determined that the relay 5 does not operate due to the closing signal, and an error is displayed on the display unit 13. Is made. In this case, charging device 2 stops oscillation of the CPLT signal and stops the mode 2 control.

  As shown in FIG. 7, when charging is stopped or expired, the vehicle-side charging control circuit 10 opens the power reception permission switch 12. Along with this, the CPLT signal becomes 9V oscillation, and an open circuit signal is output from the judging means 6 to the relay 5 so that the relay 5 is opened. Here, in the state determination of the relay 5, as shown in the state a of Table 1, the measurement result of the voltage detection unit 7 disposed on each of the power supply side and the load side across the relay 5 is obtained from the determination unit 6 to the relay. 5, when the open circuit signal of the charging circuit is being transmitted, when the voltage is on the power source side and the voltage is not on the load side, it is determined that the relay 5 is not welded and is in a normal state. The In addition, when the determination of the state b is made, the contact is welded and an error is displayed on the display unit 13.

  On the other hand, as shown in FIG. 8, when a voltage fluctuation exceeding a threshold value (for example, ± 30% of the rating) is detected by the voltage fluctuation detecting means 14 in this embodiment (ST1), a fluctuation signal is output from the voltage fluctuation detecting means 14. Output (ST2). The fluctuation signal is transmitted to the malfunction avoidance means 15 of the determination means 6 to stop the state determination function of the relay 5 described above (ST3). Thereby, even if the relay 5 is opened due to an instantaneous voltage drop, it is possible to avoid non-operation determination (error determination) due to mismatch between the measurement result of the voltage detection unit 7 and the open / close signal for the relay 5 of the determination means 6. .

  When the voltage fluctuation recovers within a predetermined time after stopping the state determination function of the relay 5 (ST4), a recovery signal is output from the voltage fluctuation detecting means 14 (ST5). At this time, since the determination means 6 continues to output a closing signal, the relay 5 is in a closing state (ST6). Subsequently, the determination unit 6 restarts the state determination function of the relay 5 that has been stopped by the malfunction avoidance unit 15 by the avoidance function stop unit 17 (ST7). Thereby, charging can be continued without performing mode 2 control again. In addition, the said predetermined time shall be shorter than the time (for example, 200-300 ms) when the control part 30 stops by the influence of an instantaneous voltage drop.

  On the other hand, when the voltage fluctuation exceeding the threshold continues for the predetermined time or more, the voltage supplied to the control unit 30 also decreases. As a result, the potential of the CPLT signal generated by the CPLT circuit may be affected. Since the charging device 2 may make an erroneous error determination or affect the charging control of the vehicle due to the CPLT signal affected by the voltage fluctuation, the malfunction avoiding means 16 detects the CPLT after a predetermined time after detecting the voltage fluctuation. Control is performed to temporarily set the signal to 0 V (ST8).

Thereafter, when the voltage fluctuation detecting means 14 detects that the voltage fluctuation has recovered within the threshold (ST9), a recovery signal is output from the voltage fluctuation detecting means 14 to the determining means 6 (ST10). When the recovery signal is transmitted, the avoidance function stopping unit 17 controls the CPLT circuit 4 to generate a CPLT signal having a constant voltage of 12V (ST11).
Here, since the vehicle is still connected to the charging device 2, the 12V CPLT signal is divided by the vehicle internal resistance R2 to 9V. Thereafter, charging to the in-vehicle battery is resumed through a normal mode 2 control process (ST12). In order to enable the voltage fluctuation detection means 14 to detect the power return when a long-time power outage or voltage fluctuation continues, it is preferable to provide a power storage means such as a capacitor or a battery in the control unit 3. .

(Embodiment 2)
FIG. 9 shows a block diagram of the control unit 40 of the second embodiment. In addition to the CPLT circuit 4 that generates a CPLT signal, the control unit 40 is also provided with a determination means 6 that transmits a charging circuit open / close signal to the relay 5 based on the CPLT signal, and an external supply to the charging device 2 A voltage fluctuation detecting means 14 for detecting a voltage fluctuation of the power source and a malfunction avoiding means 16 for stopping the generation of the CPLT signal in the CPLT circuit 4 when the voltage fluctuation detected by the voltage fluctuation detecting means exceeds a threshold value. The control unit 40 is supplied with a DC current obtained by rectifying an external AC power source, adjacent to the control unit 40, and provided with an avoidance function stop unit 17 that restarts the generation of the CPLT signal that has been stopped by the malfunction avoidance unit 16. The point provided with the power supply part 9 to perform and the display part 13 which performs the display of a charge condition, an error display, etc. is the same as that of Embodiment 1 shown in FIG. On the other hand, there is no contact detection means 8 for detecting the open / close state of the relay 5 based on the measurement result (voltage / non-voltage) of the voltage detector 7, and malfunction avoidance having the function of stopping the state determination of the relay 5. The difference is that the means 15 is not provided.

  Also in this embodiment, the CPLT circuit 4 performs the normal mode 2 control in the normal time when there is no voltage fluctuation, as in the first embodiment.

  On the other hand, when a voltage variation occurs, the voltage supplied to the control unit 30 decreases, and the potential of the CPLT signal generated by the CPLT circuit 4 may be affected by the voltage variation. When the CPLT signal affected by the voltage fluctuation is input to the charging control circuit 10 on the vehicle side, charging is temporarily stopped until the voltage fluctuation converges. The malfunction avoiding means 16 is configured as a function of temporarily stopping the generation of the CPLT signal by controlling the CPLT circuit by the determining means 6, and the potential of the CPLT signal is lowered due to the influence of the voltage fluctuation. Avoid making erroneous error determinations or affecting vehicle charging control.

  In the present embodiment, as shown in FIG. 10, when the voltage fluctuation exceeding the threshold is detected by the voltage fluctuation detecting means 14 (ST101), the fluctuation signal is output from the voltage fluctuation detecting means 14 to the malfunction avoiding means 16 of the determining means 6. (ST102). The malfunction avoiding means 16 of the judging means 6 temporarily sets the CPLT signal to 0 V after a predetermined time after detecting the voltage fluctuation in order to avoid the risk of affecting the potential of the CPLT signal due to the voltage drop of the external power supply. (ST103). When the CPLT signal becomes 0V, determination means 6 generates and transmits an open circuit signal for relay 5, and relay 5 is opened to stop charging the in-vehicle battery (ST104). In addition, the said predetermined time shall be shorter than the time (for example, 200-300 ms) when the control part 30 stops by the influence of an instantaneous voltage drop.

  Thereafter, when the voltage fluctuation detecting means 14 detects that the voltage fluctuation has recovered within the threshold (ST105), a recovery signal is output from the voltage fluctuation detecting means 14 (ST106). When the recovery signal is transmitted to the determination means 6, the avoidance function stop means 17 of the determination means 6 controls the CPLT circuit 4 to resume the generation of the CPLT signal having a constant potential of 12V (ST107).

  Here, since the vehicle is still connected to the charging device 2, the 12V CPLT signal is divided by the vehicle internal resistance R2 to 9V. Thereafter, charging to the in-vehicle battery is resumed through the same process as the normal mode 2 control (ST108). In order to enable the voltage fluctuation detection means 14 to detect the power return when a long-time power outage or voltage fluctuation continues, it is preferable to provide a power storage means such as a capacitor or a battery in the control unit 3. .

DESCRIPTION OF SYMBOLS 1 Load apparatus 2 Charging apparatus 3 Control part 4 CPLT circuit 5 Relay 6 Judgment means 7 Voltage detection part 8 Contact detection means 9 Power supply part 10 Charging control circuit 11 Oscillator 12 Power reception permission switch 13 Display part 14 Voltage fluctuation detection means 15 Malfunction avoidance means 16 Malfunction avoidance means 30 Control unit 40 Control unit

Claims (5)

A control unit having a CPLT circuit for generating a CPLT signal and a determination unit having a function of transmitting an open / close signal to the relay based on the CPLT signal;
A charging device comprising: a relay that opens and closes a charging electric path to a load device by an opening / closing signal of a determination means;
The control unit further includes voltage fluctuation detection means for detecting voltage fluctuation of an external power source supplied from the outside to the charging device;
When the voltage fluctuation detected by the voltage fluctuation detection means exceeds a threshold, the malfunction avoiding means for stopping the relay state determination; and the malfunction avoiding means for stopping the generation of the CPLT signal ,
A charging device that operates one or both of the two malfunction avoiding means according to the duration of the voltage fluctuation detected by the voltage fluctuation detecting means . A voltage detector is arranged on each of the power supply side and the load side of the charging circuit across the relay,
The determination means further has a function of receiving a signal indicating the open / close state of the relay from the voltage detection unit, and determining the relay state based on consistency with the open / close signal,
The charging apparatus according to claim 1, wherein the malfunction avoiding means stops the relay state determination in the determining means.   The control unit further comprises an avoidance function stop means for stopping the function of the malfunction avoidance means when the voltage fluctuation detected by the voltage fluctuation detection means recovers within a threshold value. The charging device described in 1.   4. The charging apparatus according to claim 3, wherein the avoidance function stopping unit restarts the relay state determination in the determination unit.   4. The charging apparatus according to claim 3, wherein the avoidance function stop means restarts the generation of the CPLT signal.