JP5229139B2 - Bidirectional DCDC converter - Google Patents

Description

  The present invention relates to a bidirectional DCDC converter including H-bridge circuits each composed of a plurality of switching elements on a primary side and a secondary side of a transformer.

FIG. 16 is a diagram illustrating an existing bidirectional DC-DC converter.
A bidirectional DCDC converter 160 shown in FIG. 16 is connected to a transformer 161, a plurality of switching elements 162 to 165 that are connected to a primary coil of the transformer 161 and constitute an H-bridge circuit, and a secondary coil of the transformer 161. A plurality of switching elements 166 to 169 constituting an H-bridge circuit and an inductor 170 provided in the output stage are provided. In addition, although the switching elements 162 to 169 shown in FIG. 16 employ IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) in which diodes are connected in parallel may be employed. Is not limited.

  First, the switching elements 162 and 165 and the switching elements 163 and 164 are alternately turned on and off to convert the DC input voltage Vin into an AC voltage and apply it to the primary coil of the transformer 161. At this time, the switching elements 167 and 168 are turned off during the on period of the switching elements 162 and 165, and the switching elements 166 and 169 are turned off during the on period of the switching elements 163 and 164, whereby the secondary coil of the transformer 161 is applied. The AC voltage is full-wave rectified by each diode of the switching elements 166 to 169. The full-wave rectified voltage is smoothed by the inductor 170 and output as a DC output voltage Vout.

  In the bidirectional DCDC converter 160 configured in this manner, power is transferred between the input and output in accordance with the load connected to the output side. In other words, when the load connected to the output side consumes power, the bidirectional DCDC converter 160 is in a power running state in which power is supplied from the primary side to the secondary side of the transformer 161, and the output side When electric power is generated from a load connected to the transformer 161, the power is supplied from the secondary side of the transformer 161 to the primary side.

  For example, if the duty ratio between the ON period and the OFF period in each of the drive signal Sd11 that turns on and off the switching elements 162 and 165 and the drive signal Sd12 that turns on and off the switching elements 163 and 164 is d / 2, The output voltage Vout of the bidirectional DCDC converter 160 is output voltage Vout = N2 / N1 × (d−α) × input voltage Vin. N1 is the number of windings of the primary side coil of the transformer 161, N2 is the number of windings of the secondary side coil of the transformer 161, and α is the loss of the bidirectional DCDC converter 160 during powering, the drive signal Sd11, The value (> 0) when replaced with the duty ratio of Sd12.

  In addition, for example, the duty ratio between the period in which the on periods of the drive signal Sd21 for turning on and off the switching elements 166 and 169 and the drive signal Sd22 for turning on and off the switching elements 167 and 168 overlap each other and the period not overlapping each other is D / 2, the output voltage Vout of the bidirectional DCDC converter 160 during regeneration is output voltage Vout = N2 / N1 × (1− (D−β)) × input voltage Vin. Note that β is a value (> 0) when the loss of the bidirectional DCDC converter 160 during regeneration is replaced with the duty ratio of the drive signals Sd21 and Sd22.

  Here, the period when the switching elements 162 and 165 are turned on and off (or the period when the switching elements 166 and 169 are turned on and off) and the period when the switching elements 163 and 164 are turned on and off (or the switching elements 167 and 168 are turned on) , And the switching elements 162 and 165 and the switching elements 167 and 168 (or the switching elements 163 and 164 and the switching elements 166 and 169) are not turned on at the same time. ) T is δT, d + D + 4 × δ = 1, so that the output voltage Vout = N2 / N1 × (1− (D−β)) × input voltage Vin = N2 / N1 × (d + β + 4δ) × input voltage Vin.

  As described above, the duty ratio part “d−α” of the arithmetic expression representing the output voltage Vout during power running and the duty ratio part “d + β + 4δ” of the arithmetic expression representing the output voltage Vout during regeneration are different from each other. As a result, when transitioning from regeneration to power running, control delays of the respective duty ratios of the drive signals Sd11, Sd12, Sd21, and Sd22 occur, and the output voltage Vout drops. That is, when changing from regeneration to power running, control is performed to reduce the respective duty ratios of the drive signals Sd11, Sd12, Sd21, and Sd22 in order to compensate for “d + β + 4δ” − “d−α”, and thus the output voltage Vout Will be depressed. Similarly, when a transition is made from power running to regeneration, control delays of the respective duty ratios of the drive signals Sd11, Sd12, Sd21, and Sd22 occur, and the output voltage Vout increases. That is, when the transition from power running to regeneration is performed, control is performed to increase the respective duty ratios of the drive signals Sd11, Sd12, Sd21, and Sd22 in order to compensate for “d−α” − “d + β + 4δ”, so that the output voltage Vout Will be lifted.

  Therefore, in order to improve the drop in the output voltage Vout that occurs at the time of transition from regeneration to power running or the increase in the output voltage Vout that occurs at the time of transition from power running to regeneration, for example, a dead time δT is set as shown in FIG. There is something to correct (see, for example, Patent Document 1).

  However, the configuration for correcting the dead time δT in this way has a small effect of improving the drop in the output voltage Vout that occurs at the time of transition from regeneration to power running or the increase in the output voltage Vout that occurs at the time of transition from power running to regeneration. There is room for further improvement.

JP 2007-221920 A

  The present invention provides a bidirectional DCDC converter capable of sufficiently improving the drop in the output voltage Vout that occurs at the time of transition from regeneration to power running, or the increase in the output voltage Vout that occurs at the time of transition from power running to regeneration. With the goal.

  The bidirectional DC-DC converter according to the present invention converts the input voltage into an AC voltage by turning on and off based on the transformer and the first drive signal, respectively, and applies a plurality of first voltages applied to the primary coil of the transformer. A plurality of second switching elements for rectifying an AC voltage applied to a secondary coil of the transformer by turning on and off based on the second drive signal, respectively, and the plurality of second switching elements; A bidirectional DCDC converter comprising an inductor for smoothing the voltage rectified by the control circuit and a control circuit for outputting the first and second drive signals, wherein the control circuit has an output voltage smoothed by the inductor. Calculation means for calculating the duty ratio of the first and second drive signals so as to match the target voltage, and calculation by the calculation means Drive signal output means for outputting the first and second drive signals based on the duty ratio determined, and a first duty ratio corresponding to a loss generated during power running and a loss generated during regeneration when transitioning from regeneration to power running Is added to the duty ratio obtained by the computing means, and when the transition from power running to regeneration is performed, the first duty ratio and the second duty ratio are respectively obtained by the computing means. Correction means for subtracting from the determined duty ratio.

  Thereby, when changing from regeneration to power running, the duty ratio obtained by the calculation means can be increased, so that the drop in output voltage can be improved. Further, since the duty ratio obtained by the calculation means can be reduced when the power running is changed to the regeneration, the lifting can be improved. In addition, in the output voltage, the first duty ratio and the second duty ratio are more dominant than the dead time. Therefore, as compared with the conventional case where the duty ratio is corrected in consideration of only the dead time, It is possible to sufficiently improve the drop in the output voltage Vout that occurs at the time of transition from regeneration to power running and the lift of the output voltage Vout that occurs at the time of transition from power running to regeneration.

  The correction means adds a dead time in the first drive signal and the second drive signal to the duty ratio obtained by the calculation means when transitioning from regeneration to power running, and from power running to regeneration. At the time of transition, the dead time may be subtracted from the duty ratio obtained by the calculation means.

  The bidirectional DC-DC converter according to the present invention further includes a first current sensor that detects a primary current that flows on a primary side of the transformer, and the correction unit includes the primary current and the first duty. A first map file associated with a ratio and a second map file associated with the primary current and the second duty ratio, and when the transition from regeneration to power running, The first duty ratio corresponding to the primary current detected by the first current sensor at the current control timing is determined using the first map file, and the second map file is used. When the second duty ratio corresponding to the primary current detected by the first current sensor at the previous control timing is determined and transition from power running to regeneration is performed, the first macro The first duty ratio corresponding to the primary current detected by the first current sensor at the previous control timing is determined using the profile file and the second map file is used to determine the current duty ratio. You may comprise so that the said 2nd duty ratio corresponding to the primary side current detected by the said 1st current sensor in control timing may be determined.

  The bidirectional DC-DC converter according to the present invention further includes temperature detection means for detecting a temperature in the vicinity of the transformer, and the first map file includes the primary side current and the first duty for each predetermined temperature range. The second map file is associated with the primary current and the second duty ratio for each predetermined temperature range, and the correction unit is configured to change from regeneration to power running. The first duty ratio is determined using the first map file corresponding to the temperature detected by the temperature detection means at the current control timing, and is detected by the temperature detection means at the previous control timing. When the second duty ratio is determined using the second map file corresponding to the detected temperature and a transition is made from power running to regeneration, the previous control type The first duty ratio is determined using the first map file corresponding to the temperature detected by the temperature detection means in the control and corresponds to the temperature detected by the temperature detection means at the current control timing The second duty ratio may be determined using the second map file.

  The bidirectional DC-DC converter according to the present invention further includes a second current sensor that detects a secondary current that flows on a secondary side of the transformer, and the correction unit includes the secondary current and the first duty. A third map file associated with a ratio and a fourth map file associated with the secondary current and the second duty ratio, and when transitioning from regeneration to power running, 3 is used to determine the first duty ratio corresponding to the secondary current detected by the second current sensor at the current control timing, and to use the fourth map file. When the second duty ratio corresponding to the secondary-side current detected by the second current sensor at the previous control timing is determined and the transition from power running to regeneration is performed, the third macro The first duty ratio corresponding to the secondary current detected by the second current sensor at the previous control timing is determined using a profile file and the fourth map file is used to determine the current duty ratio. You may comprise so that the said 2nd duty ratio corresponding to the secondary side current detected by the said 2nd current sensor in control timing may be determined.

  The bidirectional DC-DC converter according to the present invention further includes temperature detection means for detecting a temperature in the vicinity of the transformer, and the third map file includes the secondary current and the first duty for each predetermined temperature range. In the fourth map file, the secondary current and the second duty are associated with each other for each predetermined temperature range, and when the correction unit makes a transition from regeneration to power running, The first duty ratio is determined using the third map file corresponding to the temperature detected by the temperature detection means at the control timing, and the temperature detected by the temperature detection means at the previous control timing When the second duty ratio is determined using the fourth map file corresponding to, and the transition from power running to regeneration is performed, the previous control timing And determining the first duty ratio using the third map file corresponding to the temperature detected by the temperature detecting means and corresponding to the temperature detected by the temperature detecting means at the current control timing. The second duty ratio may be determined using the fourth map file.

  The bidirectional DC-DC converter according to the present invention further includes a first current sensor that detects a primary current that flows on a primary side of the transformer, and the correction unit performs the current control when transitioning from regeneration to power running. The first duty is determined by calculation based on the primary current detected by the first current sensor at the timing, and the primary current detected by the first current sensor at the previous control timing is determined. The second duty is determined by calculation based on the calculation, and when the transition from power running to regeneration is performed, the first duty is calculated by calculation based on the primary current detected by the first current sensor at the previous control timing. And a calculation based on the primary current detected by the first current sensor at the current control timing. It may be configured to determine a second duty.

  The bidirectional DC-DC converter according to the present invention further includes a second current sensor that detects a secondary current that flows on the secondary side of the transformer, and the correction unit performs the current control when transitioning from regeneration to power running. The first duty is determined by calculation based on the secondary current detected by the second current sensor at the timing, and the secondary current detected by the second current sensor at the previous control timing is determined. Based on the secondary current detected by the second current sensor at the previous control timing when the second duty is determined based on the calculation and transition from power running to regeneration is performed, the first duty is calculated by calculation. And a calculation based on the secondary current detected by the second current sensor at the current control timing. It may be configured to determine a second duty.

  The bidirectional DCDC converter according to the present invention further includes a first current sensor that detects a primary current that flows on a primary side of the transformer, and the correction unit includes a loss of the bidirectional DCDC converter and the first current sensor. And a sixth map file in which the loss of the bidirectional DC-DC converter and the second duty ratio are associated with each other, and transition from regeneration to power running. At the time, using the fifth map file, the first duty ratio corresponding to the loss which is the calculation result of ((the input voltage−the output voltage) × the primary current at the current control timing) is calculated. And the calculation result of ((the input voltage−the output voltage) × the primary current at the previous control timing) using the sixth map file. The first duty ratio corresponding to the loss to be determined is determined, and the transition from power running to regeneration is performed using the fifth map file ((the input voltage−the output voltage) × the previous control timing). The first duty ratio corresponding to the loss that is the calculation result of (primary current) is determined and the sixth map file is used ((the input voltage−the output voltage) × the current control timing) You may comprise so that the said 1st duty ratio corresponding to the loss which is a calculation result of the said (primary side electric current) may be determined.

  The bidirectional DC-DC converter according to the present invention further includes a second current sensor that detects a secondary-side current that flows on the secondary side of the transformer, and the correction means includes the loss of the bidirectional DC-DC converter and the first current sensor. And a sixth map file in which the loss of the bidirectional DC-DC converter and the second duty ratio are associated with each other, and transition from regeneration to power running. At the time, using the fifth map file, the first duty ratio corresponding to the loss which is the calculation result of ((the input voltage−the output voltage) × the secondary current at the current control timing) is calculated. And the calculation result of ((the input voltage−the output voltage) × the secondary current at the previous control timing) using the sixth map file. The first duty ratio corresponding to the loss to be determined is determined, and the transition from power running to regeneration is performed using the fifth map file ((the input voltage−the output voltage) × the previous control timing). The first duty ratio corresponding to the loss that is the calculation result of (secondary current) is determined and the sixth map file is used ((the input voltage−the output voltage) × the current control timing) You may comprise so that the said 1st duty ratio corresponding to the loss which is a calculation result of the said (secondary side electric current) may be determined.

  According to the present invention, in the bidirectional DCDC converter having H bridge circuits on the primary side and the secondary side of the transformer, a drop in the output voltage Vout that occurs at the time of transition from regeneration to power running, or transition from power running to regeneration, respectively. The increase in the output voltage Vout that sometimes occurs can be sufficiently improved.

It is a figure which shows the bidirectional DCDC converter of 1st Embodiment of this invention. It is a figure which shows an example of map file I and II. It is a flowchart for demonstrating operation | movement of CPU in the bidirectional DCDC converter of 1st Embodiment. It is a figure which shows an example of Vin, Vout, I1, and I2 at the time of changing from regeneration to power running. It is a figure which shows an example of Vin, Vout, I1, and I2 at the time of making a transition from power running to regeneration. It is a flowchart for demonstrating operation | movement of CPU in the modification of the bidirectional DCDC converter of 1st Embodiment. It is a flowchart for demonstrating operation | movement of CPU in the modification of the bidirectional DCDC converter of 1st Embodiment. It is a figure which shows the bidirectional DCDC converter of 2nd Embodiment of this invention. It is a figure which shows an example of map file III, IV. It is a flowchart for demonstrating operation | movement of CPU in the bidirectional DCDC converter of 2nd Embodiment. It is a figure which shows an example of Vin, Vout, I1, and I2 at the time of changing from regeneration to power running. It is a figure which shows an example of Vin, Vout, I1, and I2 at the time of making a transition from power running to regeneration. It is a figure which shows the bidirectional DCDC converter of 3rd Embodiment of this invention. It is a figure which shows an example of map file V, VI. It is a flowchart for demonstrating operation | movement of CPU in the bidirectional DCDC converter of 3rd Embodiment. It is a figure which shows the existing bidirectional DCDC converter. It is a figure which shows the timing chart of drive signal Sd11, Sd12, Sd21, Sd22.

<First Embodiment>
FIG. 1 is a diagram showing a bidirectional DCDC converter according to a first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as the structure shown in FIG.

  The bidirectional DCDC converter 1 shown in FIG. 1 includes a transformer 161, switching elements 162 to 165 (a plurality of first switching elements), switching elements 166 to 169 (a plurality of second switching elements), an inductor 170, , CPU 2, temperature sensor 3, current sensor 4, and drive circuits 5 to 8. In addition, the control circuit in a claim shall be comprised by CPU2 and the drive circuits 5-8 etc., for example. Further, although the switching elements 162 to 169 shown in FIG. 1 employ IGβT, MOSFETs to which diodes are connected in parallel may be employed, and the switching elements 162 to 169 are not particularly limited.

The temperature sensor 3 is provided in the vicinity of the transformer 161 and detects the temperature Th in the vicinity of the transformer 161.
The current sensor 4 detects a primary side current I1 flowing on the primary side of the transformer 161. The current sensor 4 shown in FIG. 1 detects the primary current I1 flowing through the negative input terminal.

  The drive circuit 5 outputs a drive signal Sd11 (first drive signal) for turning on and off the switching elements 162 and 165 based on the pulse signal Sp11 output from the CPU 2.

  The drive circuit 6 outputs a drive signal Sd12 (first drive signal) that turns on and off the switching elements 163 and 164 based on the pulse signal Sp12 output from the CPU 2.

  The drive circuit 7 outputs a drive signal Sd21 (second drive signal) for turning on and off the switching elements 166 and 169 based on the pulse signal Sp21 output from the CPU 2.

  The drive circuit 8 outputs a drive signal Sd22 (second drive signal) for turning on and off the switching elements 167 and 168 based on the pulse signal Sp22 output from the CPU2.

  The CPU 2 includes a calculation unit 9, a PI calculation unit 10, a memory 11, a calculation unit 12, a timing adjustment unit 13, pulse output units 14 to 17, and a correction unit 18. In addition, the calculation means in a claim shall be comprised by the calculating part 9, PI calculating part 10, the memory 11, and the calculating part 12, etc., for example. The drive signal output means in the claims is constituted by drive circuits 5 to 8 and pulse output units 14 to 17. Further, the correcting means in the claims is constituted by the timing adjusting unit 13, the correcting unit 18, and the like.

The calculation unit 9 calculates a difference ΔV between the output voltage Vout of the bidirectional DCDC converter 1 and the target output voltage Vref.
The PI calculation unit 10 calculates Δd = Kp (coefficient of proportional term of PI calculation) × ΔV + Ki (coefficient of integral term of PI calculation) × ΣΔV and outputs a control duty ratio Δd.

Memory 11 is computed duty ratio d _n is stored by the arithmetic unit 12 in the control timing of the previous time.
Arithmetic unit 12 adds the duty ratio d _n to be extracted from the control duty ratio Δd and the memory 11 that is output from the PI operation section 10 outputs a duty ratio d _{n + 1.} By turning on and off the switching elements 162 to 169 based on the duty ratio dn _{+ 1} , the output voltage Vout matches the target output voltage Vref.

The timing adjustment unit 13 outputs the duty ratio dn _{+ 1} output from the calculation unit 12 to the pulse output units 14 to 17, respectively. In addition, the timing adjustment unit 13 determines α (first duty ratio), β (second duty ratio) and dead determined by the correction unit 18 when transitioning from regeneration to power running or when transitioning from power running to regeneration. Based on the time δT, the duty ratio dn _{+ 1} output from the calculation unit 12 is corrected, and the corrected duty ratio dn _{+ 1} is output to the pulse output units 14 to 17, respectively. As described above, the dead time δT is a period for preventing the switching elements 162 and 165 and the switching elements 167 and 168 (or the switching elements 163 and 164 and the switching elements 166 and 169) from being turned on at the same time.

The pulse output unit 14 outputs the pulse signal Sp11 shown in FIG. 17 to the drive circuit 5 based on the duty ratio dn _{+ 1} output from the timing adjustment unit 13.
The pulse output unit 15 outputs the pulse signal Sp12 shown in FIG. 17 to the drive circuit 6 based on the duty ratio dn _{+ 1} output from the timing adjustment unit 13.

The pulse output unit 16 outputs the pulse signal Sp21 shown in FIG. 17 to the drive circuit 7 based on the duty ratio dn _{+ 1} and the dead time δT output from the timing adjustment unit 13.

The pulse output unit 17 outputs the pulse signal Sp22 shown in FIG. 17 to the drive circuit 8 based on the duty ratio dn _{+ 1} and the dead time δT output from the timing adjustment unit 13.

The pulse output units 14 and 15 generate the pulse signals Sp11 and Sp12 based on the duty ratio dn _{+ 1} and the dead time δT, and the pulse output units 16 and 17 generate the pulse signals Sp21 and Sp22 based on the duty ratio dn _{+ 1.} May be.

When the correction unit 18 makes a transition from regeneration to power running, among the map files I (first map files) in which the primary-side currents I1 and α are associated with each other for each predetermined temperature range, at the current control timing. The map file I corresponding to the temperature Th _n detected by the temperature sensor 3 is used to determine α corresponding to the primary current I1 _n detected by the current sensor 4 at the current control timing, and at a predetermined temperature range Of each map file II (second map file) in which the primary currents I1 and β are associated with each other, the map corresponding to the temperature Th _n−1 detected by the temperature sensor 3 at the previous control timing. Using the file II, β corresponding to the primary current I1 _n−1 detected by the current sensor 4 at the previous control timing is determined. Α is a value (> 0) when the loss of the bidirectional DCDC converter 1 during power running is replaced with the duty ratio of the drive signals Sd11 and Sd12. Β is a value (> 0) when the loss of the bidirectional DCDC converter 1 during regeneration is replaced with the duty ratio of the drive signals Sd21 and Sd22.

Further, the correction unit 18 uses the map file I corresponding to the temperature Th _n−1 detected by the temperature sensor 3 at the previous control timing among the map files I when the transition is made from power running to regeneration. Α corresponding to the primary side current I1 _n−1 detected by the current sensor 4 at the control timing is determined, and among the map files II, the temperature Th _n detected by the temperature sensor 3 at the current control timing is determined. Is used to determine β corresponding to the primary current I1 _n detected by the current sensor 4 at the current control timing.

  For example, FIG. 2A to FIG. 2C are diagrams showing an example of the map file I graphed. FIG. 2A is a graph showing a map file I showing a correspondence relationship between the primary current I1 and α when the temperature Th is less than 20 ° C., and FIG. FIG. 2C is a graph showing the map file I showing the correspondence between the primary side current I1 and α when the temperature is 20 ° C. or higher and lower than 40 ° C. FIG. It is the figure which graphed the map file I which shows the correspondence of secondary side current I1 and (alpha). According to each map file I, α increases as the temperature Th or the primary current I1 increases.

  Further, for example, FIGS. 2D to 2F are diagrams showing an example of the map file II described above. FIG. 2D is a graph of the map file II showing the correspondence between the primary current I1 and β when the temperature Th is less than 20 ° C., and FIG. FIG. 2F is a graph showing the map file II showing the correspondence between the primary side current I1 and β when the temperature is 20 ° C. or more and less than 40 ° C. FIG. It is the figure which made the map file II which shows the correspondence of secondary side current I1 and (beta) into a graph. According to each map file II, β increases as the temperature Th or the primary current I1 increases.

  FIG. 3 is a flowchart for explaining the operation of the CPU 2 in the bidirectional DCDC converter 1 of the first embodiment. Note that a series of operations in the flowchart shown in FIG. 3 is executed at every control timing of a fixed period.

First, the computing unit 9 computes the difference ΔV, the PI computing unit 10 outputs the control duty ratio Δd, and the computing unit 12 outputs the duty ratio dn _{+ 1} (S1).
Next, the correction unit 18 reads the primary current I1 _n detected by the current sensor 4 (S2), and then reads the temperature T _n detected by the temperature sensor 3 (S3).

Next, the correction unit 18 determines whether the primary current I1 _n is zero (I1 _n = 0), negative (I1 _n <0), or positive (I1 _n > 0) ( S4).
If the correction unit 18 determines that the primary current I1 _n is zero, the timing adjustment unit 13 outputs the duty ratio dn _{+ 1} output from the calculation unit 12 to the pulse output units 14 to 17 (S5). ), And the pulse output units 14 to 17 respectively output pulse signals Sp11, Sp12, Sp21, and Sp22 based on the duty ratio dn _{+ 1} (S6).

When determining that the primary side current I1 _n is negative, the correction unit 18 determines that the primary side current I1 _n−1 detected by the current sensor 4 at the previous control timing is equal to or greater than zero (I1 _{n −1} ≧ 0) is determined (S7).

When the correction unit 18 determines that the primary current I1 _n−1 is not equal to or greater than zero, the timing adjustment unit 13 outputs the duty ratio d _{n + 1} output from the calculation unit 12 to the pulse output units 14 to 17, respectively. (S8) The pulse output units 14 to 17 each output the pulse signals Sp11, Sp12, Sp21, Sp22 based on the duty ratio dn _{+ 1} (S6).

On the other hand, when it is determined that the primary current I1 _n-1 is equal to or greater than zero, that is, when the transition is made from regeneration to power running between the previous control timing and the current control timing, or from the previous control timing. If the primary current I1 until the current control timing is shifted from the zero state to the power running, the correction unit 18 uses the map file I corresponding to the temperature Th _n read in S3 in the current control timing Α corresponding to the primary current I1 _n read in S2 at the current control timing is determined, and the map file II corresponding to the temperature Th _n−1 read in S3 at the previous control timing is used for the previous time. Β corresponding to the primary current I1 _n−1 read in S2 at the control timing is determined (S9).

Next, the CPU 2 corrects the duty ratio d _{n + 1} output from the calculation unit 12 by calculating d _{n + 1} + 4δ + α + β based on α and β determined by the correction unit 18 and the dead time δT, and the correction The subsequent duty ratio dn _{+ 1} is output to the pulse output units 14 to 17 (S10), and the pulse output units 14 to 17 output the pulse signals Sp11, Sp12, Sp21, and Sp22 based on the duty ratio dn _{+ 1} , respectively. (S6). Thus, when transitioning from the regeneration to power running, "d + β + 4δ" - also controlled to reduce the duty ratio d _{n + 1} in order to compensate for the "d-alpha" is performed by the PI calculation portion 10, the duty ratio d _{n + 1} Since the correction can be made to “d _{n + 1} + 4δ + α + β”, the output voltage Vout can be increased and the drop of the output voltage Vout can be improved as compared with the case where the duty ratio d _{n + 1} is not corrected.

When determining that the primary side current I1 _n is positive, the correction unit 18 determines that the primary side current I1 _n−1 detected by the current sensor 4 at the previous control timing is zero or more (I1 _{n −1} ≧ 0) is judged (S11).

When the correction unit 18 determines that the primary-side current I1 _n−1 is equal to or greater than zero, the timing adjustment unit 13 outputs the duty ratio d _{n + 1} output from the calculation unit 12 to the pulse output units 14 to 17, respectively. The pulse output units 14 to 17 output the pulse signals Sp11, Sp12, Sp21, Sp22 based on the duty ratio dn _{+ 1} (S6).

On the other hand, when it is determined that the primary current I1 _n-1 is not equal to or greater than zero, that is, when the transition from power running to regeneration is performed from the previous control timing to the current control timing, or the current control is performed from the previous control timing. When the primary current I1 transitions from the zero state to the regeneration until the timing, the correction unit 18 uses the map file I corresponding to the temperature Th _n-1 read in S3 at the previous control timing. Α corresponding to the primary current I1 _n−1 read in S2 at the previous control timing is determined, and this time using the map file II corresponding to the temperature Th _n read in S3 at the current control timing. Β corresponding to the primary current I1 _n read in S2 at the control timing is determined (S13).

Next, the timing adjustment unit 13 corrects the duty ratio d _{n + 1} output from the calculation unit 12 by calculating d _{n + 1} + 4δ + α + β based on α and β determined by the correction unit 18 and the dead time δT. Then, the corrected duty ratio dn _{+ 1} is output to the pulse output units 14 to 17 (S14), and the pulse output units 14 to 17 respectively output the pulse signals Sp11, Sp12, Sp21, Sp21, based on the duty ratio dn _{+ 1} . Sp22 is output (S6). As a result, even when the PI operation unit 10 performs control for increasing the duty ratio dn _{+ 1} to compensate for “d−α” − “d + β + 4δ” when the transition from power running to regeneration is performed, the duty ratio dn _{+ 1 is set} to the duty ratio dn _{+ 1} . Since it can be corrected to “d _{n + 1} −4δ−α−β”, the output voltage Vout can be lowered and the increase in the output voltage Vout can be improved as compared with the case where the duty ratio d _{n + 1} is not corrected. it can.

FIG. 4A shows an input voltage Vin, an output voltage Vout, and a primary-side current I1 when the duty ratio dn _{+ 1} is not corrected when the bidirectional DCDC converter 1 according to the first embodiment makes a transition from regeneration to power running. FIG. 4B is a diagram illustrating the secondary current I2 flowing to the secondary side of the transformer 161. FIG. 4B illustrates the input voltage Vin and the output voltage when correcting the duty ratio dn _{+ 1} when transitioning from regeneration to power running. It is a figure which shows Vout, the primary side electric current I1, and the secondary side electric current I2. One scale on the vertical axis of the input voltage Vin indicates 100 [V], one scale on the vertical axis of the output voltage Vout indicates 5 [V], and one scale on the vertical axis of the primary current I1 is 20 [V]. A] and one scale of the secondary current I2 indicates 50 [A]. The output voltage Vout is assumed to be offset by +40 [V].

4 (a) and as shown in FIG. 4 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} the drop in the output voltage Vout generated at the time of transition to the power running from the regenerative Has been improved. Further, as shown in FIG. 4 (a) and 4 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} and improved transitions speed to power running from the regenerative Yes. Further, as shown in FIG. 4 (a) and 4 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} which transitions smoothly from regeneration to power running.

FIG. 5A shows an input voltage Vin, an output voltage Vout, and a primary side current I1 when the duty ratio dn _{+ 1} is not corrected when the bidirectional DCDC converter 1 according to the first embodiment makes a transition from power running to regeneration. 5B is a diagram illustrating the secondary current I2, and FIG. 5B illustrates the input voltage Vin, the output voltage Vout, and the primary current I1, when correcting the duty ratio dn _{+ 1} when transitioning from power running to regeneration. FIG. 6 is a diagram showing a secondary current I2. One scale on the vertical axis of the input voltage Vin indicates 100 [V], one scale on the vertical axis of the output voltage Vout indicates 5 [V], and one scale on the vertical axis of the primary current I1 is 20 [V]. A] and one scale of the secondary current I2 indicates 50 [A]. The output voltage Vout is assumed to be offset by +40 [V].

As shown in FIG. 5 (a) and 5 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} raised in the output voltage Vout generated at the time of transition to the regenerative from powering Has been improved. Further, as shown in FIG. 5 (a) and 5 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} and improved transitions speed to regeneration from powering Yes. Further, as shown in FIG. 5 (a) and 5 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} which transitions smoothly from powering to regeneration.

As described above, in the bidirectional DCDC converter 1 according to the first embodiment, when the transition from the regeneration to the power running is performed, the duty ratio d _{n + 1} is decreased to compensate for “d + β + 4δ” − “d−α”. _Since correction for increasing _{n + 1} is performed, it is possible to improve the drop in the output voltage Vout. Furthermore, when transitioning from the power running to regeneration, "d-alpha" - "d + β + 4δ" amount that the duty ratio d _{n + 1} is increased to compensate for, for correcting to reduce the duty ratio d _{n + 1,} is raised output voltage Vout Can be improved.

In the bidirectional DCDC converter 1 according to the first embodiment, not only the dead time δT but also α and β corresponding to the loss of the bidirectional DCDC converter 1 at the time of transition from regeneration to power running or at the time of transition from power running to regeneration. Since the duty ratio dn _{+ 1} is corrected in consideration of the above, the output voltage Vout generated at the time of transition from regeneration to power running is compared with the case where the duty ratio dn _{+ 1} is corrected in consideration of only the dead time δT as in the prior art. It is possible to sufficiently improve the increase in the output voltage Vout that occurs at the time of depression or transition from power running to regeneration.

The bidirectional DCDC converter 1 according to the first embodiment is configured to determine α and β based on the temperature Th and the primary current I1 when correcting the duty ratio dn _{+ 1.} You may comprise so that (alpha) and (beta) may be determined only based on the electric current I1. In the case of such a configuration, the correction unit 18 only needs to have, for example, the map file I shown in FIG. 2B and the map file II shown in FIG. 2E, as in the flowchart shown in FIG. In step S9, α and β are determined using the map file I and map file II, and in step S13, α and β are determined using the map file I and map file II.

In the bidirectional DCDC converter 1 of the first embodiment, when correcting the duty ratio dn _{+ 1} , α and β are determined by the map files I and II. However, α and β are determined by calculation. You may comprise. In the case of such a configuration, the correction unit 18 does not need to have a map file, and in S9, a two-variable function of α = f _α (temperature Th, primary side current I1) is used as shown in the flowchart of FIG. The temperature Th _n and the primary current I1 _n are substituted, and the temperature Th _n−1 and the primary current I1 _n−1 are substituted into a two-variable function of β = f _β (temperature Th, primary current I1). Then, α and β are determined, and the temperature Th _n−1 and the primary current I1 _n−1 are substituted into a two-variable function of α = f _α (temperature Th, primary current I1) in S13, α and β are determined by substituting the temperature Th _n and the primary current I1 _n into a two-variable function of β = f _β (temperature Th, primary current I1).

In the bidirectional DCDC converter 1 of the first embodiment, the duty ratio dn _{+ 1} is corrected to “dn + ₁ + 4δ + α + β” when transitioning from regeneration to power running, and the duty ratio dn _{+ 1} is modified when transitioning from power running to regeneration. Although it is the structure correct | amended to "dn ₊ 1-4 (delta)-(alpha) -beta", when changing from regeneration to power running, it corrects duty ratio dn _{+ 1} to "dn _{+ 1} + α + beta", and when changing from power running to regeneration, duty ratio it may be configured so as to correct the d _{n + 1} to _{"d n +} 1 _-α-β". Thus, even if the duty dn _{+ 1} is corrected in consideration of only the loss occurring at the time of transition from regeneration to power running or from power running to regeneration, the output voltage Vout = N2 / N1 × (d−α) × input voltage. Since Vin and output voltage Vout = N2 / N1 × (d + β + 4δ) × input voltage Vin are more dominant than δ, the duty ratio dn _{+ 1} is corrected in consideration of only the dead time δT as in the past. Compared with the case where it does, the fall of the output voltage Vout which arises at the time of the transition from regeneration to power running and the raise of the output voltage Vout which arises at the time of transition from power running to regeneration can be improved sufficiently.
Second Embodiment
FIG. 8 is a diagram showing a bidirectional DCDC converter according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as the structure shown in FIG.

  The bidirectional DCDC converter 80 of the second embodiment shown in FIG. 8 is different from the bidirectional DCDC converter 1 of the first embodiment in that the current sensor 4 detects the secondary current I2 flowing to the secondary side of the transformer 161. This is the point. Note that the current sensor 4 shown in FIG. 8 detects the secondary current I2 flowing through the negative output terminal.

When the correction unit 18 in the bidirectional DCDC converter 80 of the second embodiment makes a transition from regeneration to power running, each map file III (the third one) in which the secondary currents I2 and α are associated with each other for each predetermined temperature range. Map file III) corresponding to the temperature T _n detected by the temperature sensor 3 at the current control timing, and the secondary side current I2 _n detected by the current sensor 4 at the current control timing is used. The corresponding α is determined and detected by the temperature sensor 3 at the previous control timing among the map files IV (fourth map files) in which the secondary currents I2 and β are associated with each other for each predetermined temperature range. Secondary side current detected by the current sensor 4 at the previous control timing using the map file IV corresponding to the measured temperature T _n-1 Β corresponding to I2 _n−1 is determined.

Further, the correction unit 18 in the bidirectional DCDC converter 80 according to the second embodiment detects the temperature T1 _n−1 detected by the temperature sensor 3 at the previous control timing in each map file III when transitioning from power running to regeneration. Is used to determine α corresponding to the secondary current I2 _n−1 detected by the current sensor 4 at the previous control timing, and among the map files IV, the current control timing is determined. determining β corresponding to the secondary current I2 _n detected by the current sensor 4 in the current control timing using the map file IV corresponding to the detected temperature T _n by the temperature sensor 3 at.

  For example, FIG. 9A to FIG. 9C are diagrams showing an example of the map file III described above. FIG. 9A is a graph showing a map file III showing a correspondence relationship between the secondary current I2 and α when the temperature Th is less than 20 ° C., and FIG. FIG. 9C is a graph showing the map file III showing the correspondence between the secondary current I2 and α when the temperature is 20 ° C. or more and less than 40 ° C. FIG. It is the figure which made the map file III which shows the correspondence of secondary side current I2 and (alpha) into a graph. According to each map file III described above, α increases as the temperature Th and the secondary current I2 increase.

  Further, for example, FIG. 9D to FIG. 9F are diagrams showing examples of the map files IV described above. FIG. 9D is a graph showing a map file IV showing the correspondence between the secondary current I2 and β when the temperature Th is less than 20 ° C., and FIG. FIG. 9F is a graph showing a map file IV showing the correspondence between the secondary current I2 and β when the temperature is 20 ° C. or more and less than 40 ° C. FIG. It is the figure which made the map file IV which shows the correspondence of secondary side current I2 and (beta) into a graph. According to each map file IV, β increases as the temperature Th and the secondary current I2 increase.

FIG. 10 is a flowchart for explaining the operation of the CPU 2 in the bidirectional DCDC converter 80 of the second embodiment.
The flowchart shown in FIG. 10 is different from the flowchart shown in FIG. 3 in that the primary current I1 is changed to the secondary current I2.

Therefore, in S9 of FIG. 10, the correction unit 18 uses the map file III corresponding to the temperature Th _n read in S3 at the current control timing and uses the secondary current I2 _n read in S2 at the current control timing. And the secondary current I2 _n-1 read in S2 at the previous control timing using the map file IV corresponding to the temperature Th _n-1 read in S3 at the previous control timing. Β corresponding to is determined.

In S13 of FIG. 10, the correction unit 13 uses the map file III corresponding to the temperature Th _n−1 read in S3 at the previous control timing, and uses the secondary current read at S2 at the previous control timing. Α corresponding to I2 _n−1 is determined, and the secondary current I2 _n read in S2 at the current control timing using the map file IV corresponding to the temperature Th _n read in S3 at the current control timing. Β corresponding to is determined.

FIG. 11A shows an input voltage Vin, an output voltage Vout, and a primary-side current I1 when the duty ratio dn _{+ 1} is not corrected when the bidirectional DCDC converter 80 according to the second embodiment transitions from regeneration to power running. 11B is a diagram illustrating the secondary current I2, and FIG. 11B illustrates the input voltage Vin, the output voltage Vout, and the primary current I1, when correcting the duty ratio dn _{+ 1} when transitioning from regeneration to power running. FIG. 6 is a diagram showing a secondary current I2. One scale on the vertical axis of the input voltage Vin indicates 100 [V], one scale on the vertical axis of the output voltage Vout indicates 5 [V], and one scale on the vertical axis of the primary current I1 is 20 [V]. A] and one scale of the secondary current I2 indicates 50 [A]. The output voltage Vout is assumed to be offset by +40 [V].

As shown in FIG. 11 (a) and FIG. 11 (b), the case of correcting the duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} the drop in the output voltage Vout generated at the time of transition to the power running from the regenerative Has been improved. Further, as shown in FIG. 11 (a) and FIG. 11 (b), the case of correcting the duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} and improved transitions speed to power running from the regenerative Yes.

FIG. 12A shows an input voltage Vin, an output voltage Vout, and a primary-side current I1 when the duty ratio dn _{+ 1} is not corrected when the bidirectional DC-DC converter 80 according to the second embodiment transitions from power running to regeneration. 12B is a diagram illustrating the secondary current I2, and FIG. 12B illustrates the input voltage Vin, the output voltage Vout, and the primary current I1, when correcting the duty ratio dn _{+ 1} when transitioning from power running to regeneration. FIG. 6 is a diagram showing a secondary current I2. One scale on the vertical axis of the input voltage Vin indicates 100 [V], one scale on the vertical axis of the output voltage Vout indicates 5 [V], and one scale on the vertical axis of the primary current I1 is 20 [V]. A] and one scale of the secondary current I2 indicates 50 [A]. The output voltage Vout is assumed to be offset by +40 [V].

Figure 12 (a) and 12 as shown in FIG. 12 (b), when corrected duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} raised in the output voltage Vout generated at the time of transition to the regenerative from powering Has been improved. Further, as shown in FIG. 12 (a) and FIG. 12 (b), the case of correcting the duty ratio d _{n + 1,} as compared with the case of not correcting the duty ratio d _{n + 1,} and improved transitions speed to regeneration from powering Yes.

As described above, also in the bidirectional DCDC converter 80 of the second embodiment, the duty ratio d _{n + 1} is decreased to compensate for “d + β + 4δ” − “d−α” when transitioning from regeneration to power running. Since correction for increasing _{dn + 1} is performed, it is possible to improve the drop in the output voltage Vout. Furthermore, when transitioning from the power running to regeneration, "d-alpha" - "d + β + 4δ" amount that the duty ratio d _{n + 1} is increased to compensate for, for correcting to reduce the duty ratio d _{n + 1,} is raised output voltage Vout Can be improved.

In the bidirectional DCDC converter 80 of the second embodiment, not only the dead time δT but also α, β corresponding to the loss of the bidirectional DCDC converter 80 at the time of transition from regeneration to power running or at the time of transition from power running to regeneration. Since the duty ratio dn _{+ 1} is corrected in consideration of the above, the output voltage Vout generated at the time of transition from regeneration to power running is compared with the case where the duty ratio dn _{+ 1} is corrected in consideration of only the dead time δT as in the prior art. The rise of the output voltage Vout that occurs at the time of a drop in power or a transition from power running to regeneration can be sufficiently improved.

The bidirectional DCDC converter 80 of the second embodiment is configured to determine α and β based on the temperature Th and the secondary current I2 when correcting the duty ratio dn _{+ 1.} Similarly to the bidirectional DCDC converter 1 of the embodiment, α and β may be determined based only on the secondary side current I2.

Further, in the bidirectional DCDC converter 80 of the second embodiment, when correcting the duty ratio dn _{+ 1} , α and β are determined by the map files III and IV, but the bidirectional DCDC converter of the first embodiment. Similarly to 1, it may be configured to determine α and β by calculation.

In the bidirectional DCDC converter 80 of the second embodiment, the duty ratio dn _{+ 1} is corrected to “d _{n + 1} + 4δ + α + β” when transitioning from regeneration to power running, and the duty ratio dn _{+ 1} is modified when transitioning from power running to regeneration. Although it is the structure correct | amended to "dn ₊ 1-4 (delta)-(alpha) -beta", like the bidirectional DCDC converter 1 of 1st Embodiment, when changing from regeneration to power running, duty ratio dn _{+ 1} is "dn _{+ 1} + alpha + beta". The duty ratio dn _{+ 1} may be corrected to “ _{dn + 1−} α−β” when transitioning from power running to regeneration.
<Third Embodiment>
FIG. 13 is a diagram showing a bidirectional DCDC converter 130 according to the third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as the structure shown in FIG.

The bidirectional DCDC converter 130 of the third embodiment shown in FIG. 13 is different from the bidirectional DCDC converter 1 of the first embodiment in that when the correction unit 18 corrects the duty ratio dn _{+ 1} , the loss P = (( The output voltage Vout−the input voltage Vin) × the primary current I1) is obtained, and α and β corresponding to the loss P are determined using the map file corresponding to the temperature T.

When the correction unit 18 in the bidirectional DCDC converter 130 of the third embodiment transitions from regeneration to power running, each map file V (fifth map file) in which the loss P and α are associated with each other for each predetermined temperature range. Among them, α corresponding to the loss P _n obtained from the primary side current I1 _{n at the} current control timing using the map file V corresponding to the temperature Th _n detected by the temperature sensor 3 at the current control timing. The temperature Th detected by the temperature sensor 3 at the previous control timing among the map files VI (sixth map files) in which the primary currents I1 and β are associated with each other for each predetermined temperature range. loss P _n-1 obtained by the primary current I1 _n-1 in the immediately preceding control timing using the map file VI corresponding to _n-1 To determine the β to respond.

Further, the correction unit 18 in the bidirectional DCDC converter 130 of the third embodiment, when changing from power running to regeneration, among the map files V, the temperature Th _n−1 detected by the temperature sensor 3 at the previous control timing. Α corresponding to the loss P _n−1 obtained from the primary current I1 _n−1 at the previous control timing is determined using the map file V corresponding to the current control time, and the control of this time among the map files VI is determined. The map file VI corresponding to the temperature Th _n detected by the temperature sensor 3 at the timing is used to determine β corresponding to the loss P _n obtained from the primary side current I1 _{n at the} current control timing.

  For example, FIG. 14A to FIG. 14C are diagrams showing an example of the map file V described above. FIG. 14A is a graph of a map file V showing the correspondence between the loss P and α when the temperature Th is less than 20 ° C., and FIG. 14B shows the temperature Th of 20 ° C. or more. FIG. 14C is a graph of the map file V showing the correspondence between the loss P and α when the temperature is less than 40 ° C. FIG. 14C shows the correspondence between the loss P and α when the temperature Th is 40 ° C. or more. It is the figure which graphed the map file V which shows a relationship. According to each map file V, α increases as the temperature Th and the loss P increase.

  Further, for example, FIG. 14D to FIG. 14F are diagrams showing examples of the map files VI described above. FIG. 14 (d) is a graph of the map file VI showing the correspondence between the loss P and β when the temperature Th is less than 20 ° C., and FIG. 14 (e) shows the temperature Th at 20 ° C. or higher. FIG. 14F is a graph of the map file VI showing the correspondence between the loss P and β when the temperature is lower than 40 ° C. FIG. 14F shows the correspondence between the loss P and β when the temperature Th is 40 ° C. or higher. It is the figure which graphed the map file VI which shows a relationship. According to each map file VI, β increases as the temperature Th and the loss P increase.

FIG. 15 is a flowchart for explaining the operation of the CPU 2 in the bidirectional DCDC converter 130 of the third embodiment.
The flowchart shown in FIG. 15 differs from the flowchart shown in FIG. 3 in that after S3, the input voltage Vin is read in S31, and the output voltage Vout is read in S32.

Therefore, in S9 of FIG. 15, the correction unit 18 uses the map file V corresponding to the temperature Th _n read in S3 at the current control timing to calculate α corresponding to the loss P _n obtained at the current control timing. At the same time, the map file VI corresponding to the temperature Th _n−1 read in S3 at the previous control timing is used to determine β corresponding to the loss P _n−1 obtained at the previous control timing.

In S13 of FIG. 15, the correction unit 18 uses the map file V corresponding to the temperature Th _n−1 read in S3 at the previous control timing to obtain the loss P _n−1 obtained at the previous control timing. A corresponding α is determined, and β corresponding to the loss P _n obtained at the current control timing is determined using the map file VI corresponding to the temperature Th _n read at S3 at the current control timing.

As described above, also in the bidirectional DCDC converter 130 of the third embodiment, the duty ratio dn _{+ 1} is decreased to compensate for “d + β + 4δ” − “d−α” when transitioning from regeneration to power running. Since correction for increasing _{dn + 1} is performed, it is possible to improve the drop in the output voltage Vout. Furthermore, when transitioning from the power running to regeneration, "d-alpha" - "d + β + 4δ" amount that the duty ratio d _{n + 1} is increased to compensate for, for correcting to reduce the duty ratio d _{n + 1,} is raised output voltage Vout Can be improved.

In the bidirectional DCDC converter 130 of the third embodiment, not only the dead time δT but also α, β corresponding to the loss of the bidirectional DCDC converter 130 at the time of transition from regeneration to power running or at the time of transition from power running to regeneration. Since the duty ratio dn _{+ 1} is corrected in consideration of the above, the output voltage Vout generated at the time of transition from regeneration to power running is compared with the case where the duty ratio dn _{+ 1} is corrected in consideration of only the dead time δT as in the prior art. The rise of the output voltage Vout that occurs at the time of a drop in power or a transition from power running to regeneration can be sufficiently improved.

  In the bidirectional DCDC converter 130 of the third embodiment, the loss P is obtained by calculating ((output voltage Vout−input voltage Vin) × primary current I1). You may comprise so that the loss P may be calculated | required by calculating Vout-input voltage Vin) x secondary side current I2).

In the bidirectional DCDC converter 130 of the third embodiment, when correcting the duty ratio dn _{+ 1} , α and β are determined based on the primary side current I1 or the secondary side current I2 and the temperature Th. However, as with the bidirectional DCDC converter 1 of the first embodiment, α and β may be determined based only on the primary side current I1 or the secondary side current I2.

In the bidirectional DCDC converter 130 of the third embodiment, when correcting the duty ratio dn _{+ 1} , α and β are determined by the map files V and VI, but the bidirectional DCDC converter of the first embodiment. Similarly to 1, it may be configured to determine α and β by calculation.

In the bidirectional DC-DC converter 130 of the third embodiment, the duty ratio dn _{+ 1} is corrected to “dn + ₁ + 4δ + α + β” when transitioning from regeneration to power running, and the duty ratio dn _{+ 1} is modified when transitioning from power running to regeneration. Although it is the structure correct | amended to "dn ₊ 1-4 (delta)-(alpha) -beta", like the bidirectional DCDC converter 1 of 1st Embodiment, when changing from regeneration to power running, duty ratio dn _{+ 1} is "dn _{+ 1} + alpha + beta". The duty ratio dn _{+ 1} may be corrected to “ _{dn + 1−} α−β” when transitioning from power running to regeneration.

1 Bidirectional DCDC converter 2 CPU
3 Temperature Sensor 4 Current Sensor 5-8 Drive Circuit 9 Computing Unit 10 PI Computing Unit 11 Memory 12 Computing Unit 13 Timing Adjusting Units 14-17 Pulse Output Unit 18 Correction Unit 80 Bidirectional DCDC Converter 130 Bidirectional DCDC Converter 160 Bidirectional DCDC Converter 161 Transformer 162-169 Switching element 170 Inductor

Claims (10)

A transformer, a plurality of first switching elements applied to a primary side coil of the transformer by turning on and off based on the first drive signal to convert the input voltage to an AC voltage, and a second drive signal A plurality of second switching elements that rectify the AC voltage applied to the secondary coil of the transformer by turning on and off based on each of the transformers, and an inductor that smoothes the voltage rectified by the plurality of second switching elements And a bidirectional DCDC converter comprising a control circuit for outputting the first and second drive signals,
The control circuit includes:
Computing means for computing a duty ratio of the first and second drive signals so that an output voltage smoothed by the inductor matches a target voltage;
Drive signal output means for outputting the first and second drive signals based on the duty ratio calculated by the calculation means;
When transitioning from regeneration to power running, the first duty ratio corresponding to the loss generated during power running and the second duty ratio corresponding to the loss generated during regeneration are respectively added to the duty ratio determined by the computing means, Correction means for subtracting the first duty ratio and the second duty ratio from the duty ratio determined by the calculation means respectively when transitioning to regeneration;
A bidirectional DCDC converter comprising: A bidirectional DC-DC converter according to claim 1,
The correction unit adds a dead time in the first drive signal and the second drive signal to the duty ratio obtained by the calculation unit when transitioning from regeneration to power running, and transits from power running to regeneration. The bidirectional DCDC converter, wherein the dead time is subtracted from the duty ratio obtained by the calculating means. A bidirectional DC-DC converter according to claim 1 or 2,
A first current sensor for detecting a primary current flowing in the primary side of the transformer;
The correction means includes a first map file in which the primary current and the first duty ratio are associated, and a second map in which the primary current and the second duty ratio are associated. The first file corresponding to the primary current detected by the first current sensor at the current control timing using the first map file when transitioning from regeneration to power running when having a map file The duty ratio is determined, and the second map file is used to determine the second duty ratio corresponding to the primary current detected by the first current sensor at the previous control timing. The first map corresponding to the primary current detected by the first current sensor at the previous control timing using the first map file when transitioning to regeneration. The duty ratio is determined, and the second map file is used to determine the second duty ratio corresponding to the primary current detected by the first current sensor at the current control timing. Bidirectional DCDC converter. A bidirectional DC-DC converter according to claim 3,
Temperature detecting means for detecting the temperature in the vicinity of the transformer,
In the first map file, the primary current and the first duty ratio are associated with each other for each predetermined temperature range.
In the second map file, the primary current and the second duty ratio are associated with each other for each predetermined temperature range.
The correction means determines the first duty ratio using the first map file corresponding to the temperature detected by the temperature detection means at the current control timing when transitioning from regeneration to power running. When the second duty ratio is determined using the second map file corresponding to the temperature detected by the temperature detection means at the previous control timing, and when transitioning from power running to regeneration, at the previous control timing The first duty ratio is determined using the first map file corresponding to the temperature detected by the temperature detecting means, and the temperature corresponding to the temperature detected by the temperature detecting means at the current control timing is determined. Bi-directional using the second map file to determine the second duty ratio DCDC converter. A bidirectional DC-DC converter according to claim 1 or 2,
A second current sensor for detecting a secondary current flowing in the secondary side of the transformer;
The correction means includes a third map file in which the secondary current and the first duty ratio are associated with each other, and a fourth map in which the secondary current and the second duty ratio are associated with each other. The first map corresponding to the secondary current detected by the second current sensor at the current control timing using the third map file when transitioning from regeneration to power running when having a map file The duty ratio is determined and the second map ratio is used to determine the second duty ratio corresponding to the secondary current detected by the second current sensor at the previous control timing using the fourth map file. When transitioning to regeneration, the first map corresponding to the secondary current detected by the second current sensor at the previous control timing using the third map file. A duty ratio is determined, and the second duty ratio corresponding to the secondary current detected by the second current sensor at the current control timing is determined using the fourth map file. Bidirectional DCDC converter. A bidirectional DC-DC converter according to claim 5,
Temperature detecting means for detecting the temperature in the vicinity of the transformer,
In the third map file, the secondary current and the first duty are associated with each other for each predetermined temperature range.
In the fourth map file, the secondary current and the second duty are associated with each other for each predetermined temperature range.
The correction means determines the first duty ratio using the third map file corresponding to the temperature detected by the temperature detection means at the current control timing when transitioning from regeneration to power running. When the second duty ratio is determined using the fourth map file corresponding to the temperature detected by the temperature detection means at the previous control timing, and when transitioning from power running to regeneration, at the previous control timing The first duty ratio is determined using the third map file corresponding to the temperature detected by the temperature detecting means, and the temperature corresponding to the temperature detected by the temperature detecting means at the current control timing is determined. Bi-directional using the fourth map file to determine the second duty ratio DCDC converter. A bidirectional DC-DC converter according to claim 1 or 2,
A first current sensor for detecting a primary current flowing in the primary side of the transformer;
The correction means determines the first duty by calculation based on the primary current detected by the first current sensor at the current control timing when transitioning from regeneration to power running, and the previous control timing. The second duty is determined by calculation based on the primary side current detected by the first current sensor at the time of transition from power running to regeneration, and is detected by the first current sensor at the previous control timing. The first duty is determined by calculation based on the primary current thus determined, and the second duty is calculated by calculation based on the primary current detected by the first current sensor at the current control timing. A bidirectional DC-DC converter characterized by determining. A bidirectional DC-DC converter according to claim 1 or 2,
A second current sensor for detecting a secondary current flowing in the secondary side of the transformer;
The correction means determines the first duty by calculation based on the secondary side current detected by the second current sensor at the current control timing when transitioning from regeneration to power running, and the previous control timing. The second duty is determined by calculation based on the secondary side current detected by the second current sensor at, and detected by the second current sensor at the previous control timing when transitioning from power running to regeneration. The first duty is determined by calculation based on the secondary current that has been generated, and the second duty is calculated by calculation based on the secondary current detected by the second current sensor at the current control timing. A bidirectional DC-DC converter characterized by determining. A bidirectional DC-DC converter according to claim 1 or 2,
A first current sensor for detecting a primary current flowing in the primary side of the transformer;
The correction means associates the fifth map file in which the loss of the bidirectional DCDC converter is associated with the first duty ratio, and the loss of the bidirectional DCDC converter in association with the second duty ratio. When the transition from regeneration to power running is made, the fifth map file is used ((the input voltage−the output voltage) × the primary current at the current control timing). The first duty ratio corresponding to the loss that is the calculation result of the above is determined and the sixth map file is used ((the input voltage−the output voltage) × the primary current at the previous control timing) ) Is used to determine the first duty ratio corresponding to the loss that is the calculation result of the calculation, and when transitioning from powering to regeneration, the fifth map file is used ((previous (The input voltage−the output voltage) × the primary current at the previous control timing) and determining the first duty ratio corresponding to the loss and using the sixth map file ( The bidirectional DCDC converter characterized by determining the first duty ratio corresponding to a loss which is a calculation result of (the input voltage-the output voltage) x the primary current at the current control timing. A bidirectional DC-DC converter according to claim 1 or 2,
A second current sensor for detecting a secondary current flowing in the secondary side of the transformer;
The correction means associates the fifth map file in which the loss of the bidirectional DCDC converter is associated with the first duty ratio, and the loss of the bidirectional DCDC converter in association with the second duty ratio. When the transition from regeneration to power running is performed, the fifth map file is used ((the input voltage−the output voltage) × the secondary current at the current control timing). And determining the first duty ratio corresponding to the loss that is the calculation result of the above and using the sixth map file ((the input voltage−the output voltage) × the secondary current at the previous control timing) ) Is used to determine the first duty ratio corresponding to the loss that is the calculation result of the calculation, and when transitioning from powering to regeneration, the fifth map file is used ((previous (The input voltage−the output voltage) × the secondary current at the previous control timing) is determined, and the first duty ratio corresponding to the loss is determined and the sixth map file is used ( The bidirectional DCDC converter, wherein the first duty ratio corresponding to a loss that is a calculation result of (the input voltage-the output voltage) x the secondary current at the current control timing) is determined.