JP6048991B1 - Power conversion control system - Google Patents

Abstract

Power factor improvement is aimed at by preventing overlap of detection processing of a zero cross point and message reception processing and suppressing deviation of a reference current waveform used for power factor improvement. When the power conversion control device 20 determines that the time difference between the reception time of the message from the second control device 30 and the detection time of the zero cross point is equal to or less than a threshold value, the power conversion control device 20 transmits a transmission timing change message. The second control device 30 that has received the transmission timing change message reads the transmission timing pattern designated by the transmission timing change message from the transmission timing change list recording unit 330 and changes the transmission timing. [Selection] Figure 1

Description

  The present invention relates to a power conversion control system, and more particularly to a power conversion control system having a power conversion device that converts AC power into DC power.

  In recent years, electric vehicles have attracted attention as environmentally friendly vehicles. An electric vehicle includes an electric motor that generates a driving force for driving and a driving battery that stores electric power supplied to the electric motor. Examples of such an electric vehicle include an electric vehicle and a plug-in hybrid vehicle.

  In addition, a technology for charging a driving battery mounted on these electric vehicles from an external power source has been developed. Among such techniques, a generally known technique is a technique for charging a driving battery using an outlet of a commercial power source provided in a general household. In this technology, the battery for driving the electric vehicle is charged from the commercial power source via the charging cable by connecting the commercial power source and the electric vehicle with the charging cable.

  At this time, since the commercial power source is an AC power source, in order to charge the drive battery, a power conversion device for converting AC power into DC power is required. In such a power converter, it is required to improve the power factor in order to suppress the influence of reactive power on the power network and electromagnetic noise.

  Therefore, for example, the power factor correction apparatus described in Patent Document 1 includes a zero cross detection circuit for detecting a zero cross point of the input voltage waveform of the AC power supply. The control unit calculates a reference current waveform that is a target of the input current based on the zero cross point detected by the zero cross detection circuit. Further, the phase adjusting means advances or delays the reference current waveform so that the phase difference becomes small according to the phase difference between the input current and the reference current waveform.

JP 2012-222911 A

  As described above, in the power factor correction device disclosed in Patent Document 1, the control unit calculates the reference current waveform that is the target of the input current based on the detected zero cross point. Therefore, if the control unit is executing a high priority process such as a communication process when a zero cross point is detected, the control unit gives priority to the process. There was a problem that could not be executed.

  This will be specifically described. For example, when the control unit receives a communication message from another electronic control device when the zero cross detection circuit detects a zero cross point, the control unit gives priority to the reception process. For this reason, the control unit executes the zero cross point detection process after completing the reception process of the communication message. Therefore, the zero cross point used for the detection process by the control unit is a zero cross point delayed by the execution time of the reception process. Since the reference current waveform is calculated using such a zero cross point, there is a problem that an accurate reference current waveform cannot be obtained.

  In communication within an automobile such as an electric vehicle, CAN (Controller Area Network) communication, which is a bus-type in-vehicle communication standard, has become a standard in practice. In-vehicle communication uses periodic messages such as 10 ms intervals and 100 ms intervals. However, in CAN communication, the electronic control device on the transmission side transmits a periodic message at an arbitrary timing. Therefore, the zero cross point detection process and the reception of CAN communication may overlap. In that case, since the reception process is given priority, the above-described problem occurs.

  The present invention has been made to solve such a problem, and prevents the detection process of the zero cross point and the reception process of the message from overlapping, and suppresses the deviation of the reference current waveform used for the power factor improvement. Thus, an object is to obtain a power conversion control system capable of improving the power factor.

  The present invention is a power conversion control device as a first control device that converts AC power supplied from an external AC power source into DC power, and is connected to the power conversion control device via a network and set in advance. One or more second control devices that transmit a message to the power conversion control device in a transmission timing pattern, wherein the power conversion control device detects a voltage input from the AC power supply, and the voltage A zero-cross detection unit that detects a zero-cross point of the voltage waveform of the input voltage based on the input voltage detected by the detection unit, and the power conversion control device detects the detection result of the zero-cross point and the second control. Based on the reception time when the message is received from the device, it is determined whether the zero cross point and the reception time overlap, A power conversion control system for transmitting a transmission timing change message for instructing the second control device to change the transmission timing pattern so that the zero cross point and the reception time do not overlap with each other according to a predetermined result. It is.

  According to this invention, the power conversion control device causes the second control device to change the message transmission timing so that the time difference between the zero cross point and the reception time of the message from the second control device does not become a threshold value or less. By transmitting the timing change message, the zero cross point detection process and the message reception process do not overlap, and the deviation of the reference current waveform used for power factor improvement can be suppressed, so a high power factor improvement effect can be obtained. There is an effect.

It is a figure which shows the structure of the power conversion control system in Embodiment 1 of this invention. It is a figure which shows the flow of a process of the power conversion control apparatus of the power conversion control system in Embodiment 1 of this invention. It is a figure which shows the flow of a process of the 2nd control apparatus of the power conversion control system in Embodiment 1 of this invention. It is a figure which shows the format of the transmission timing change message in Embodiment 1 of this invention. It is a figure for demonstrating the transmission timing change in the case of AC power supply 50Hz in Embodiment 1 of this invention. It is a figure for demonstrating the transmission timing change in the case of AC power supply 50Hz in Embodiment 1 of this invention. It is a figure for demonstrating the transmission timing change in the case of AC power supply 60Hz in Embodiment 1 of this invention. It is the figure which showed the table | surface of the transmission timing change list in Embodiment 1 of this invention. It is the figure which showed the table | surface of the transmission timing change list in Embodiment 2 of this invention.

  Hereinafter, a power conversion control system according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the same numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
1 is a diagram showing a configuration of a power conversion control system according to Embodiment 1 of the present invention. However, in FIG. 1, illustration of components that are not directly related to the present invention is omitted.

  As shown in FIG. 1, the power conversion control system according to the first embodiment of the present invention includes a power conversion control device 20 as a first control device and a second control device 30. Although only one second control device 30 is illustrated in FIG. 1, a plurality of second control devices 30 may be provided. The power conversion control device 20 and the second control device 30 are mounted on the electric vehicle 10. The power conversion control device 20 and the second control device 30 are connected via a CAN network 40. CAN is a CSMA / CA communication protocol.

  An AC power supply 50 is provided outside the electric vehicle 10. AC power supply 50 and electric vehicle 10 are connected via connector 60.

  The power conversion control device 20 is connected to the AC power supply 50 via the connector 60. The power conversion control device 20 has a power conversion device (not shown) for converting AC power supplied from the AC power supply 50 into DC power.

  The second control device 30 transmits a message to the power conversion control device 20 with a preset transmission timing pattern. When a plurality of second control devices 30 are provided, a different transmission timing pattern is set for each second control device 30.

  As illustrated in FIG. 1, the power conversion control device 20 includes a voltage detection unit 110, a zero cross detection unit 120, a zero cross point time interval calculation unit 130, a power factor improvement processing unit 140, a communication interface unit 170, a message, The reception time acquisition unit 180, the transmission timing change necessity determination unit 160, and the transmission timing change message transmission unit 150 are configured.

  The voltage detection unit 110 measures the input voltage input from the AC power supply 50.

  The zero cross detection unit 120 detects a zero cross point of the voltage waveform of the input voltage based on the input voltage detected by the voltage detection unit 110. The zero cross point is the time when the voltage value becomes 0 as shown in FIG. Hereinafter, this time is referred to as a zero cross point or a zero cross point detection time.

  The zero cross point time interval calculator 130 calculates a time interval between adjacent zero cross points (hereinafter referred to as a zero cross point time interval) based on the zero cross points detected by the zero cross detector 120. The zero cross point time interval varies depending on the frequency of the AC power supply 50. Specifically, when the AC power supply 50 is 50 Hz, the zero cross point time interval is 10 ms, and when the AC power supply 50 is 60 Hz, the zero cross point time interval is 8.3 ms. Therefore, by detecting the zero cross point time interval by the zero cross point time interval calculation unit 130, it is possible to determine whether the AC power supply 50 is 50 Hz or 60 Hz.

  The power factor improvement processing unit 140 performs power factor improvement processing based on the zero cross point detected by the zero cross detection unit 120. Specifically, the power factor improvement processing unit 140 calculates a reference current waveform that is a target of the input current from the AC power supply 50 based on the detected zero cross point. The power factor correction processing unit 140 controls ON / OFF of switching elements (not shown) constituting the power converter (not shown) provided in the power conversion control device 20 according to the reference current waveform. Thereby, the power factor improvement processing unit 140 can improve the power factor of the power supplied from the AC power supply 50.

  The communication interface unit 170 exchanges communications with the second control device 30 via the CAN network 40.

  When the communication interface unit 170 receives a message from the second control device 30, the message reception time acquisition unit 180 obtains the reception time of the message.

  The transmission time change necessity determination unit 160 receives the detection time of the zero cross point by the zero cross detection unit 120. Further, the transmission timing change necessity determination unit 160 receives the message reception time from the second control device 30 calculated by the message reception time acquisition unit 180. The transmission timing change necessity determination unit 160 determines whether or not it is necessary to change the message transmission timing of the second control device 30 based on the zero cross point detection time and the message reception time.

The transmission timing change message transmission unit 150 generates a transmission timing change message based on the determination result of the transmission timing change necessity determination unit 160.
Specifically, the transmission timing change message transmission unit 150 generates a transmission timing change message when the transmission timing change necessity determination unit 160 determines that the message transmission timing needs to be changed.
Details of the method of generating the transmission timing change message will be described later, and will be described briefly here.
The transmission timing change message transmission unit 150 stores in advance a list number (see Table 1 in FIG. 8) assigned to each transmission timing pattern of the transmission timing change list that the second control device 30 has.
The transmission timing change message transmission unit 150 selects a corresponding transmission timing pattern from the transmission timing change list based on the zero cross point time interval, that is, based on whether the AC power supply 50 is 50 Hz or 60 Hz.
In this way, the transmission timing change message transmitting unit 150 instructs the second control device 30 to change the message transmission timing, and information for designating the selected transmission timing pattern. A transmission timing change message including is generated. Hereinafter, this information is referred to as a list number.
The transmission timing change message transmission unit 150 transmits the transmission timing change message thus generated to the second control device 30.

  As shown in FIG. 1, the second control device 30 includes a communication interface unit 310, a transmission timing change unit 320, and a transmission timing change list recording unit 330. In FIG. 1, only one second control device 30 is illustrated. However, when a plurality of second control devices 30 are provided, each of the second control devices 30 is mounted. The communication interface unit 310, the transmission timing change unit 320, and the transmission timing change list recording unit 330 have the same function and the same configuration. However, the function and configuration of a part (not shown) for performing other processing in each second control device 30 may be different from each other in each second control device 30.

  The communication interface unit 310 exchanges communication with the power conversion control device 20 via the CAN network 40.

  The transmission timing change list recording unit 330 stores in advance a transmission timing change list shown in Table 1 of FIG. One or more transmission timing patterns are stored in the transmission timing change list. In the present embodiment, these transmission timing patterns are divided into one or more groups for each frequency of the AC power supply 50. One list number is assigned to each group.

  When the communication interface unit 310 receives a transmission timing change message from the power conversion control device 20, the transmission timing change unit 320 sends a message to the power conversion control device 20 based on the list number included in the transmission timing change message. Change the transmission timing pattern to be transmitted.

  Next, a transmission timing change procedure in the power conversion control system according to Embodiment 1 of the present invention will be described. FIG. 2 is a flowchart for explaining the operation of the power conversion control device 20.

  As shown in FIG. 2, in step S <b> 10, the power conversion control device 20 uses the message reception time acquisition unit 180 to acquire the reception time when the message is received from the second control device 30.

  Next, in step S <b> 20, the power conversion control device 20 uses the zero cross detection unit 120 to acquire the detection time of the zero cross point of the input voltage waveform based on the input voltage from the AC power supply 50 detected by the voltage detection unit 110. .

  In subsequent step S30, the power conversion control device 20 uses the transmission timing change necessity determination unit 160 to set in advance a time difference between the reception time of the message acquired in step S10 and the zero cross point detection time calculated in step S20. It is determined whether it is within the set threshold value. If the time difference between the message reception time and the zero cross point detection time is greater than the threshold (NO), the process is terminated. On the other hand, if the time difference between the message reception time and the zero cross point detection time is within the threshold (YES), the process proceeds to step S40.

  In step S40, the power conversion control device 20 causes the transmission timing change message transmission unit 150 to prevent the time difference between the detection time of the zero cross point and the message reception time from the second control device 30 from being equal to or less than the above threshold value. In accordance with the zero cross point time interval calculated by the zero cross point time interval calculation unit 130, the transmission timing pattern of the message of the second control device 30 is selected from the transmission timing change list. Then, the power conversion control device 20 includes a message transmission timing change command for the second control device 30 and a list number as information specifying the selected transmission timing pattern by the transmission timing change message transmission unit 150. Then, a transmission timing change message is generated and transmitted to the second control device 30.

In the above description, it is assumed that the message reception time from the second control device 30 is first and the zero cross point detection time is later. Therefore, the message reception time means the time when the message reception is completed.
However, the present invention is not limited to the above case, and it is sufficient that the time difference between the message reception time from the second control device 30 and the zero cross point detection time can be compared with the threshold value. Needless to say, similar processing is possible even when the message reception time from the second control device 30 is later. However, it should be noted that in this case, the message reception time is the time when the message reception is started.

  Next, the operation when the second control device 30 receives the transmission timing change message from the power conversion control device 20 will be described with reference to the flowchart of FIG.

  In step S510, the second control device 30 determines whether or not the communication interface unit 310 has received a transmission timing change message from the power conversion control device 20. If the transmission timing change message has not been received (NO), the process ends, and the reception of the transmission timing change message is awaited. On the other hand, if a transmission timing change message has been received (YES), the process proceeds to step S520.

  In step S520, the second control device 30 uses the transmission timing change unit 320 to change the transmission timing pattern specified in the transmission timing change message from the transmission timing change list recorded in the transmission timing change list recording unit 330. select.

  In subsequent step S530, the transmission timing for transmitting a message to power conversion control device 20 is changed so that the transmission timing pattern selected in step S520 is obtained.

  FIG. 4 shows a format of the transmission timing change message 800 transmitted from the power conversion control device 20 in the first embodiment. The transmission timing change message 800 is composed of a header 801 and a payload 802. The header 801 of the transmission timing change message 800 includes SOF (Start Of Frame), message ID, CRC (Cyclic Redundancy Check), and the like. The payload 802 of the transmission timing change message 800 includes list number information. As described above, each group in the transmission timing pattern of the transmission timing change list included in the second control device 30 is given a unique number for identifying it as a “list number”. Therefore, if information of “list number” is put in the payload 802, the second control device 30 determines which of the transmission timing pattern groups selected by the power conversion control device 20 based on the “list number”. Can be recognized. Therefore, this “list number” constitutes information for designating a group of the selected transmission timing patterns.

  Table 1 shown in FIG. 8 shows a transmission timing change list in the first embodiment. Table 1 is a list when the threshold for the time difference between the zero cross point and the reception time is 1 ms. The transmission timing change list is recorded in advance in the transmission timing change list recording unit 330.

  In Table 1, the list number is an identification number assigned to each group of transmission timing patterns as described above. Therefore, a group of transmission timing patterns can be specified by the list number. Therefore, the list number is specified by the transmission timing change message 800 from the power conversion control device 20, and is information for the second control device 30 to select a corresponding transmission timing pattern from the transmission timing change list. The list number is selected by the zero cross point time interval. The zero cross point time interval is 10 ms when the AC power supply 50 is 50 Hz, and approximately 8.3 ms when the AC power source 50 is 60 Hz. In the transmission timing change list of Table 1, when the AC power supply 50 is 50 Hz, that is, when the zero cross point time interval is 10 ms, the list number is 1, and when the AC power supply 50 is 60 Hz, that is, the zero cross point time interval is 8 The transmission timing pattern is defined with list number 2 in the case of 3 ms.

  Moreover, in Table 1, ID is ID for identifying each message which the 2nd control apparatus 30 transmits and the power conversion control apparatus 20 receives. An ID is assigned for each message type.

  As shown in Table 1, the transmission timing pattern of four messages whose IDs are ID101, ID102, ID201, and ID501 are included in the group of list number 1. Similarly, the group of list number 2 includes transmission timing patterns of four messages whose IDs are ID101, ID102, ID201, and ID501. Therefore, when the AC power supply 50 is 50 Hz, the messages of ID101, ID102, ID201, and ID501 are transmitted with transmission timing patterns corresponding to ID101, ID102, ID201, and ID501 of list number 1 in Table 1, respectively. Similarly, when the AC power supply 50 is 60 Hz, messages of ID101, ID102, ID201, and ID501 are transmitted with transmission timing patterns corresponding to ID101, ID102, ID201, and ID501 of list number 2 in Table 1, respectively. .

  In Table 1, the transmission period indicates the transmission period of each ID message. This transmission cycle is defined as an average time interval of a plurality of transmission timings when the transmission timing pattern includes a plurality of continuous transmission timings as in IDs 101, 102, and 201 of list number 2. .

  In Table 1, the transmission start delay indicates a transmission delay time until the second control device 30 receives the transmission timing change message as 0 and starts the next periodic transmission.

  In Table 1, the number of 1 cycle indicates how many times the transmission timing described on the right side of the column is set to 1 cycle. For example, if the number of cycles is 1, transmission is performed at intervals as described in the first cycle transmission, and this is repeated. Also, if the number of 1 cycle is 5, after the first cycle transmission, the second transmission is performed with the interval described in the second cycle transmission, and then the interval is described with the time described in the third cycle transmission. The third transmission is performed, and then the fourth transmission is performed with the interval described in the cycle fourth transmission, and then the fifth transmission is performed with the interval described in the cycle fifth transmission. Then, after the transmission of the fifth cycle, it indicates returning to the first transmission of the cycle.

  Accordingly, the cycle of the transmission timing pattern of “1 cycle count is 1” is the time described in “cycle first transmission”. Specifically, the transmission timing pattern periods of ID 101 and ID 102 of list number 1 are both 10 ms, and ID 201 is 20 ms. On the other hand, the cycle of the transmission timing pattern of “1 cycle number is 5” is the sum of the times described from “cycle 1st transmission” to “cycle 5th transmission”. Specifically, the cycle of the transmission timing pattern of ID 101 of list number 2 is 10 ms + 10 ms + 12.4 ms + 8.3 ms + 9.3 ms = 50 ms.

  5, 6, and 7 are schematic diagrams of transmission timing when transmission timing is changed in the first embodiment. 5 and 6 show a case where the AC power source is 50 Hz, and FIG. 7 shows a case where the AC power source is 60 Hz. In FIG. 5, messages of ID 101 and ID 102 are illustrated as examples of messages transmitted by the second control device 30. The ID of the transmission timing change message 800 transmitted by the power conversion control device 20 is ID001.

In the example of FIG. 5, first, the time difference between the reception time when the transmission timing change necessity determination unit 160 receives the message of ID 101 from the second control device 30 and the detection time of the zero cross point is 0.5 ms. Is determined to be 1.0 ms or less. At this time, the reception time of the message with ID 101 from the second control device 30 is the time when the reception is completed.
In response to the determination result, the transmission timing change message transmission unit 150 transmits an ID001 transmission timing change message 800 including a list number for instructing the transmission timing pattern. At this time, since the zero cross point time interval calculation unit 130 calculates that the zero cross point time interval is 10 ms, the transmission timing change message transmission unit 150 uses the list number 1 as a list number for selecting a transmission timing pattern. Select.

  The transmission of the ID001 transmission timing change message 800 is executed after a delay time set in advance from the reference has elapsed with reference to the detection time of the zero cross point.

The reason will be explained.
After the transmission timing change necessity determination unit 160 determines whether or not the time difference between the message reception time from the second control device 30 and the zero cross point detection time is within 1 ms of the threshold, the transmission timing change message The transmission unit 150 transmits a transmission timing change message 800. Therefore, since the transmission timing change message 800 cannot be transmitted immediately, a delay time based on the zero cross point is set. Here, the delay time is set to 1 ms.

  In the above description, the threshold for the time difference between the message reception time and the zero cross point detection time is 1 ms. However, the present invention is not limited to this, and the threshold may be set to another value as appropriate. Similarly, the transmission delay time of the transmission timing change message 800 has been described as being 1 ms after the zero cross point, but this is not particularly limited and may be set to other values as appropriate. However, in any case, it is necessary to set the threshold value and the delay time so that the reception time of each message and the detection time of the zero cross point do not overlap.

  When the second control device 30 receives the ID001 transmission timing change message 800, the transmission timing change unit 320, based on the received message, changes the transmission timing pattern of list number 1 from the transmission timing change list of the transmission timing change list recording unit 330. Select and change the transmission timing of the message corresponding to each ID. Specifically, according to the transmission timing pattern of Table 1, in ID101, after the completion of reception of the transmission timing change message 800, 11ms after the sum of the transmission start delay time 1ms and the time of the first cycle transmission 10ms is the next ID101. Similarly, the message transmission timing is 11.2 ms, and the message ID 102 transmission timing is the same. Since the number of 1 cycle of ID101 and ID120 is 1 at the second and subsequent transmission timings thereafter, the transmission is sequentially performed at the same 10 ms interval as the first cycle transmission timing.

  Furthermore, the transmission timings of ID101, ID102, ID201, and ID501 after the transmission of the ID001 transmission timing change message 800 will be described with reference to FIG. In FIG. 6, the reception completion time of the ID001 message 800 is set to 0 ms, and the detection time of the zero cross point and the transmission time of the message of each ID are shown. Since the message 800 of ID001 is transmitted 1 ms after the zero cross point, the zero cross point (not shown) used for the determination is −1 ms. Also, since the zero cross point time interval is 10 ms, the subsequent zero cross points are 9 ms, 19 ms, 29 ms,..., 69 ms. Further, as described above, the message of ID101 is transmitted in a cycle of 10 ms at the timing of 11 ms, 21 ms,... After 11 ms (10 ms + 1 ms), and the message of ID102 is transmitted after 11.2 ms (10 ms + 1.2 ms). It is transmitted in a cycle of 10 ms at a timing of 11.2 ms, 21.2 ms,. Also, the second control device 30 that has received ID001 performs the same processing as ID101 and ID102 for ID201 and ID501, so that ID201 has a timing of 43 ms, 63 ms, and so on after 23 ms (= 20 ms + 3 ms). The ID 501 is transmitted in a period of 50 ms at a timing of 105 ms, 155 ms,... (Not shown in FIG. 6) after 55 ms (50 ms + 5 ms). In this way, the time difference between the zero cross point and each transmission timing can be made larger than the threshold value of 1 ms, as is apparent from the zero cross point and the transmission timing time of each ID message shown in FIG.

  In the example of FIG. 6, the transmission cycle determined by “cycle first transmission” is set to an integral multiple of 10 ms of the zero cross point time interval. Therefore, if the transmission timing of each message is shifted from the zero cross point by setting the “transmission start delay time”, it is possible to always prevent the reception time of each message from overlapping with the zero cross point. Therefore, in the example of FIG. 6, the transmission delay time of the ID001 message 800 is set to 1 ms, and the “transmission start delay time” of each ID is set to a positive value of less than 9 ms. Here, the reason for setting it to less than 9 ms is that the zero cross point time interval is 10 ms, so if 9 ms, the transmission timing of ID 101 is 19 ms and overlaps with the zero cross point. By doing so, the time difference between the reception time of the message of ID101 and the zero cross point is always 2 ms, similarly, the time difference of ID102 is 2.2 ms, ID201 is 4 ms, and ID102 is 6 ms. The threshold value of 1 ms or more can be secured.

  Next, the case where the AC power supply 50 is 60 Hz will be described with reference to FIG. The time at which ID001 is transmitted is defined as 0 ms, and the zero cross point time and the transmission time of each ID are shown. Since the AC power supply 50 is 60 Hz, the zero cross point detection time is 7.33 ms, 15.67 ms, 24 ms, 32.33 ms,..., 124 ms. Note that the time that requires decimal point notation is rounded off to the third decimal place. Since the AC power supply 50 is 60 Hz, the information for selecting the transmission timing included in the transmission timing change message 800 of ID001 is the list number 2.

  When the second control device 30 receives the ID001 transmission timing change message 800, the transmission timing changing unit 320 selects the transmission timing pattern of list number 2 from the transmission timing change list recording unit 330 and corresponds to each ID. Change the message transmission timing. In the message of ID101, 11 ms after the sum of the transmission start delay time 1 ms and the first cycle transmission time 10 ms after receiving the ID001 message 800 is the transmission timing of the next ID101, and then the second cycle transmission time 10 ms later. 21 ms, followed by 33.4 ms after the 3rd cycle transmission time 12.4 ms, followed by 41.7 ms after the 8.3 ms cycle transmission time, followed by 51 ms after the 9.3 ms cycle transmission time, followed by 1 cycle Therefore, 61 ms after 10 ms of the first cycle transmission time is the transmission time of the ID 101, and the same is repeated thereafter. In the message of ID102, since the transmission start delay time is 1.2 ms, the transmission timing is 11.2 ms, 21.2 ms, 33.6 ms, 41.9 ms, 51.2 ms,. The same processing is performed for ID 201, and the transmission timing is 22.5 ms, 42.5 ms, 62.5 ms, 83.5 ms, 102.5 ms, 122.5 ms,. In ID501, the next transmission timing is 55ms after the sum of the transmission start delay time 5ms and the first cycle transmission time 50ms. Subsequently, since the number of 1 cycle is 1, 105ms after the first cycle transmission time 50ms is the transmission time. It is repeated thereafter. In this way, as apparent from the time of the zero cross point and the transmission timing shown in FIG. 7, the time interval between the zero cross point and the transmission timing can be made larger than 1 ms.

  Further, when the average cycle time for five transmissions is calculated for ID101, ID102, and ID201 with one cycle of 5, ID101 and ID102 are 10 ms and ID201 is 20 ms, respectively, which coincide with a predetermined transmission cycle.

  In this way, in the example of FIG. 7, by setting the “transmission start delay time” and setting the transmission timing interval from “cycle 1st transmission” to “cycle 5th transmission” so as not to overlap the zero cross point, It is always possible to prevent the reception time of each message from overlapping with the zero cross point. In addition, since the cycle of the transmission timing pattern is set to a common multiple of “transmission cycle” set by the average cycle time and the zero cross point time interval, when transmission of “1 cycle count” is completed, “cycle first transmission” is set. Since the resetting is performed again, the occurrence of a phenomenon that the time difference from the zero cross point gradually narrows and eventually overlaps can be suppressed.

  In the example of FIG. 7, the transmission delay time of the ID001 message 800 is 1 ms, and as shown in Table 1, the “transmission start delay time” of each ID is set to a positive value in the range of 1 to 5 ms. . Here, the reason for setting the value within the range is that the zero cross point time interval is 8.3 ms, and if it is out of the range, there is a high possibility of overlapping with the zero cross point. Further, the transmission timing intervals from “cycle first transmission” to “cycle fifth transmission” are appropriately set so as not to overlap with the zero cross point. By doing so, the time difference between the reception time of each message of ID101, ID102, ID201, and ID501 and the zero cross point can be always secured to the threshold value of 1 ms or more.

As described above, in Embodiment 1, in power conversion control device 20, transmission timing change necessity determination section 160 has a difference between a message reception time from second control device 30 and a zero-cross detection time equal to or less than a threshold value. If it is determined, a transmission timing change message is transmitted to the second control device 30. The second control device 30 that has received the transmission timing change message reads the transmission timing specified by the transmission timing change message from the transmission timing change list recording unit 330 and changes the transmission timing. The transmission timing change list is
Since it is determined that the time interval between the transmission timing of the message received by the power conversion control device 20 from the second control device 30 and the detection time of the zero cross point is not less than the threshold, the power conversion control is performed after the transmission timing is changed. The time difference between the time when the device 20 receives the message and the detection time of the zero cross point becomes larger than the threshold value. As a result, the zero cross point can be detected without delay due to communication processing, the deviation of the reference current waveform used for power factor improvement can be suppressed, and a high power factor improvement effect can be obtained.

  Furthermore, since the transmission timing can be changed with a single transmission timing change message for all the messages received by the power conversion control device 20, the zero cross point can be detected without delay due to the communication processing, and it is possible to move quickly. Become.

  Moreover, in the transmission timing pattern in which the transmission timing pattern is set to 1 cycle multiple times in the transmission timing change list, since the average time interval of the specified number of transmission timings is the cycle time defined in the corresponding message, power conversion control Can be reduced.

  In the transmission timing change list, the difference between the zero cross point and the transmission timing is not less than the threshold, and the average time interval of the specified number of transmission timings is determined for the corresponding message in a message that is set to 1 cycle multiple times. Obviously, it is only necessary to be defined so as to have a cycle time. Therefore, it is obvious that the values are not limited to those shown in Table 1.

  In addition, the transmission timing change list may be defined not only when the AC power supply is 50 Hz and 60 Hz, but also for other frequencies.

  Further, even when there are a plurality of second control devices 30, the transmission timing of all messages received by the power conversion control device 20 is changed by performing a process of changing the transmission time of each ID transmitted by the device itself. I can do it.

Embodiment 2. FIG.
Since the configuration of the power conversion control system according to Embodiment 2 of the present invention is the same as the configuration shown in FIG. 1, detailed description thereof is omitted here. The only difference between the first embodiment and the second embodiment is that the second embodiment uses the table 2 shown in FIG. 9 instead of the table 1 shown in FIG.

  Table 2 shown in FIG. 9 shows a transmission timing change list in the second embodiment. Table 2 is a list when the time difference between the zero cross point detection time and the message reception time is 1 ms. The transmission timing change list in Table 2 is recorded in advance in the transmission timing change list recording unit 330, which is the same as in the first embodiment.

  Differences between Table 1 and Table 2 will be described. The difference between Table 1 and Table 2 is how the list number is given.

  In Table 1, as described above, when the AC power supply 50 is 50 Hz, the list number 1 is set, and when the AC power supply 50 is 60 Hz, the list number 2 is set. Therefore, list numbers 1 or 2 are collectively assigned to the messages of ID101, ID102, ID201, and ID501.

  On the other hand, in Table 2, when the AC power supply 50 is 50 Hz, the list numbers 1 to 4 are set, when the AC power supply 50 is 60 Hz, the list numbers 5 to 8, and when the AC power supply is 50 Hz and 60 Hz, the respective IDs. A different list number is assigned to each. Specifically, when AC power supply 50 is 50 Hz, list number 1 is assigned to message ID 101, list number 2 is assigned to ID 102, list number 3 is assigned to ID 201, and list number 4 is assigned to ID 501. Similarly, when AC power supply 50 is 60 Hz, list number 5 is assigned to message ID 101, list number 6 is assigned to ID 102, list number 7 is assigned to ID 201, and list number 8 is assigned to ID 501.

  The difference between Table 1 and Table 2 is as described above, and Table 1 and Table 2 are the same in other points.

  Thus, the list numbers in Table 2 are assigned for each ID when the AC power supply is 50 Hz and 60 Hz. Thus, when the AC power supply 50 is 50 Hz and the message ID from the second control device 30 is ID101, the transmission timing is changed if the time difference between the message reception time and the zero-cross detection time is equal to or less than the threshold value. When the necessity determination unit 160 determines, the transmission timing change message transmission unit 150 transmits a transmission timing change message 800 including the list number 1 in the payload 802 to the second control device 30. When the AC power supply 50 is 60 Hz and the message ID from the second control device 30 is ID201, the transmission timing needs to be changed if the time difference between the message reception time and the zero-cross detection time is equal to or less than the threshold value. When the rejection determination unit 160 determines, the transmission timing change message transmission unit 150 transmits a transmission timing change message 800 including the list number 7 in the payload 802 to the second control device 30.

  As described above, in Table 2, since the list number is assigned to each message ID, the transmission timing of only the message used for determining whether the message transmission timing needs to be changed can be changed. The amount of processing can be reduced.

  In addition, a transmission timing change message may be transmitted for a message having the same transmission cycle or the same transmission timing pattern as the message used for determining whether or not to change the message transmission timing. For example, when the AC power supply is 50 Hz and the transmission timing change necessity determination unit 160 determines that the time difference between the reception time of the message ID 101 from the second control device 30 and the zero cross detection time is equal to or less than the threshold, the transmission timing The change message transmission unit 150 transmits a transmission timing change message 800 including list number 1 and list number 2.

  Since a message with a short transmission cycle is likely to overlap the zero cross point, in this way, not only the message used to determine whether the message transmission timing needs to be changed, but also the message with the same cycle changes the transmission timing at the same time. As a result, the processing amount of the second control device 30 can be reduced.

  As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained. Further, in this embodiment, by using Table 2 shown in FIG. Since the transmission timing of only the message used for determining whether or not the transmission timing needs to be changed can be changed, the processing amount of the second control device 30 can be reduced.

  As described above, the present invention can be used in a power conversion control system that converts input power from an AC power source into DC power in an electric vehicle, but is not limited to an electric vehicle, and input power from an AC power source. Needless to say, it can be applied to any device as long as it is converted to DC power.

  DESCRIPTION OF SYMBOLS 10 Electric vehicle, 20 Power conversion control apparatus, 30 2nd control apparatus, 40 CAN network, 50 AC power supply, 60 connector, 110 Voltage detection part, 120 Zero cross detection part, 130 Zero cross point time interval calculation part, 140 Power factor improvement Processing unit, 150 transmission timing change message transmission unit, 160 transmission timing change necessity determination unit, 170 communication interface unit, 180 message reception time acquisition unit, 310 communication interface unit, 320 transmission timing change unit, 330 transmission timing change list recording unit .

Claims (10)

A power conversion control device as a first control device that converts AC power supplied from an external AC power source into DC power;
One or more second control devices connected to the power conversion control device via a network and transmitting a message to the power conversion control device in a preset transmission timing pattern;
The power conversion control device includes:
A voltage detector for detecting an input voltage from the AC power supply;
A zero-cross detector that detects a zero-cross point of the voltage waveform of the input voltage based on the input voltage detected by the voltage detector; and
The power conversion control device determines whether or not the transmission timing pattern needs to be changed based on the zero cross point detected by the zero cross detection unit and the reception time when the message is received from the second control device. Transmission that instructs the second control device to change the transmission timing pattern so that the zero cross point does not overlap the reception time when it is determined that the transmission timing pattern needs to be changed Send a timing change message,
Power conversion control system. The power conversion control device includes:
When the time difference between the zero-cross point detected by the zero-cross detection unit and the reception time when the message is received from the second control device is equal to or less than a threshold, it is determined that the transmission timing pattern needs to be changed, When the time difference is larger than the threshold, it is determined that the transmission timing pattern does not need to be changed.
The power conversion control system according to claim 1. The power conversion control device includes:
A first communication interface unit that performs communication with the second control device via the network;
A message reception time acquisition unit for acquiring a reception time when the message is received from the second control device by the first communication interface unit;
Transmission for determining whether or not the transmission timing pattern of the second control device needs to be changed based on the zero-cross point detected by the zero-cross detection unit and the reception time of the message from the second control device A timing change necessity determination unit;
A transmission timing change message transmission unit that transmits the transmission timing change message to the second control device based on a determination result of the transmission timing change necessity determination unit;
The second control device comprises:
A second communication interface unit that performs communication with the power conversion control device via the network;
A transmission timing change list recording unit for recording a transmission timing change list including one or more transmission timing patterns;
When the second communication interface unit receives the transmission timing change message, the transmission timing pattern is changed using the transmission timing pattern in the transmission timing change list according to the instruction content of the transmission timing change message. A transmission timing changing unit;
The power conversion control system according to claim 2. The message transmitted from the second control device to the power conversion control device has a plurality of types,
The transmission timing pattern of the transmission timing change list is set for each type of the message,
Each one or a plurality of the transmission timing patterns is given a list number for identifying them,
In the transmission timing change message, a change command for instructing the second control device to change a transmission timing pattern, and the list number for specifying a transmission timing pattern in the transmission timing change list used for the change Including
The power conversion control system according to claim 3. The transmission timing in the transmission timing pattern of the transmission timing change list is such that the time difference between the zero cross point of the voltage waveform of the input voltage from the AC power supply and the reception time of the message from the second control device is equal to or less than the threshold value. Is set to not,
The transmission timing pattern includes a plurality of continuous transmission timings,
The total time of the transmission timing for a plurality of consecutive times is the cycle of the transmission timing pattern.
The power conversion control system according to claim 3 or 4. The transmission timing change message transmission unit transmits a transmission timing change message for the message used by the transmission timing change necessity determination unit to determine whether the message transmission timing needs to be changed.
The power conversion control system according to any one of claims 3 to 5. The list number is given for each transmission timing pattern of each message in the transmission timing change list,
When the transmission timing change message transmission unit of the power conversion control device transmits the transmission timing change message to the second control device, the transmission timing change unit of the second control device Changing only the transmission timing pattern of the message corresponding to the list number included in the timing change message;
The power conversion control system according to claim 4. The transmission timing change message transmission unit is a transmission timing for both the message used by the transmission timing change necessity determination unit to determine whether the message transmission timing needs to be changed and another message having the same transmission cycle as the message. Send a change message,
The power conversion control system according to any one of claims 3 to 5. The transmission timing pattern of the transmission timing change list is divided into one or more groups for each frequency of the AC power supply,
The list number is assigned to the group.
The power conversion control system according to claim 4. When the transmission timing change message transmission unit of the power conversion control device transmits the transmission timing change message to the second control device, the transmission timing change unit of the second control device Simultaneously changing transmission timing patterns of all types of the messages corresponding to the transmission timing patterns included in the group corresponding to the list number included in the timing change message;
The power conversion control system according to claim 9.

Images