JP5545261B2 - Boost converter controller - Google Patents

Description

  The present invention relates to a boost converter control device for controlling a boost converter having a switching element and a reactor.

  As a conventional technique in the above technical field, a boost converter control device described in Patent Document 1 is known. The boost converter control device includes a signal output unit that outputs a control signal for controlling on / off switching of the first and second switching elements, and a detection unit that detects an output voltage of the second switching element. Correction means for correcting the duty of the control signal based on a delay time from when the control signal is inverted to when the output voltage of the second switching element changes.

JP 2009-278766 A

  As described above, the boost converter control device described in Patent Document 1 stabilizes the voltage output from the boost converter by correcting the duty of the control signal based on the delay time. In such a boost converter control device, it is desired to enable appropriate current control in the boost converter in order to further stabilize the voltage output from the boost converter.

  This invention is made | formed in view of such a situation, and makes it a subject to provide the boost converter control apparatus which enables suitable electric current control in a boost converter.

  In order to solve the above-described problem, a boost converter control device according to the present invention includes first and second switching elements, and a reactor connected to a connection portion between the first switching element and the second switching element. A boost converter control device for controlling a boost converter, wherein an average value acquisition means for acquiring an average value of the reactor current by sampling the reactor current flowing through the reactor at a predetermined timing, and a current state of the reactor current A current state determination unit that determines whether the power running state, the zero-cross state, or the regenerative state, and a timing correction unit that corrects a predetermined timing according to a determination result of the current state determination unit. And

  Since this boost converter control device acquires the average value of the reactor current by sampling the reactor current at a predetermined timing, the current control in the boost converter can be performed by using the average value. In particular, the boost converter control device determines the current state of the reactor current, and corrects the sampling timing of the reactor current depending on whether the current state is a power running state, a zero-cross state, or a regenerative state. . For this reason, an accurate average value of the reactor current can be obtained. Therefore, according to this boost converter control device, appropriate current control in the boost converter is possible by using an accurate average value.

  In the boost converter control device according to the present invention, the current state determination means determines that the current state of the reactor current is the power running state, zero crossing based on the reactor current when both the first switching element and the second switching element are off. It can be set as the aspect which determines whether it is a state and a regeneration state. Alternatively, in the boost converter control device of the present invention, the current state determination means determines whether the current state of the reactor current is a power running state, a zero-cross state, or a regenerative state based on the rate of change of the reactor current with time. It is good also as an aspect to determine. In these cases, it can be reliably determined whether the current state of the reactor current is a power running state, a zero cross state, or a regenerative state.

  Here, the boost converter control device of the present invention controls the boost converter having the first and second switching elements and the reactor connected to the connection portion between the first switching element and the second switching element. A boost converter control device for acquiring current value of the reactor current by sampling the reactor current flowing in the reactor, and based on the current value of the reactor current acquired by the current value acquisition unit , Current state determination means for determining whether the current state of the reactor current is a power running state, a zero-cross state, or a regenerative state, and the current value acquisition means acquired according to the determination result of the current state determination means Average value acquisition means for acquiring an average value of the current value of the reactor current from the current value of the reactor current, And features.

  This boost converter control device determines the current state of the reactor current based on the current value of the reactor current acquired by the current value acquisition unit, and according to the result of the determination, the reactor current of the reactor current acquired by the current value acquisition unit The average value of the reactor current is obtained from the current value. For this reason, an accurate average value of the current value of the reactor current can be obtained. Therefore, according to this boost converter control device, appropriate current control in the boost converter is possible by using an accurate average value. In addition, for example, compared to the case where the reactor current is sampled and the average value is obtained after the current state is determined, the time from the determination of the current state to the acquisition of the average value can be shortened. An average value in accordance with the current state can be obtained.

  In the step-up converter control device according to the present invention, the current value acquisition means includes the start and end of the first dead time of the dead time when both the first switching element and the second switching element are off, and the dead time The current value of the reactor current at each time may be obtained by sampling the reactor current at each time of the start and end of the second dead time next to the first dead time. it can. In this case, since the current state is determined based on the current value of the reactor current at the start and end of the first dead time and the start and end of the second dead time, the current state of the reactor current Can be reliably determined as a power running state, a zero cross state, or a regenerative state.

  Alternatively, the boost converter control device of the present invention further includes a calculation unit that calculates a rate of change of the reactor current with time based on the current value of the reactor current acquired by the current value acquisition unit, and the current state determination unit calculates It can be set as the aspect which determines whether the current state of a reactor current is a power running state, a zero cross state, and a regeneration state based on the ratio of the time change of the reactor current which the means calculated. In this case, it can be reliably determined whether the current state of the reactor current is a power running state, a zero cross state, or a regenerative state.

  At this time, the boost converter control device of the present invention is configured so that the current value acquisition means has a reactor at the end time of the first dead time in the dead time in which both the first switching element and the second switching element are off. When the current value of the current is acquired in advance, the reactor current is sampled at a predetermined time between the second dead time after the first dead time and the first dead time in the dead time. To obtain the current value of the reactor current at a predetermined time, and the calculating means obtains the first value when the current value of the reactor current at the end time of the first dead time is obtained in advance. Based on the current value of the reactor current at the end time of the dead time and the current value of the reactor current at the predetermined time, The ratio of the time change of the current value of the current is calculated, and the predetermined time may be a time at the apex of the reference signal serving as a reference for the switching timing of the first switching element and the second switching element. it can. In this case, when calculating the rate of change of the reactor current with time, if the current value of the reactor current at the end of the first dead time is acquired in advance, sampling is performed only at the time of the apex of the reference signal. Just do it. For this reason, for example, each time the rate of change in the reactor current is calculated, the control cycle is compared with a case where sampling is performed at two points: the time at the top of the reference signal and the time delayed by a predetermined time from that time. And the duty can be extended.

  According to the present invention, it is possible to provide a boost converter control device that enables appropriate current control.

It is a figure which shows the structure of 1st Embodiment of the boost converter control apparatus which concerns on this invention. It is a graph which shows the time change of a carrier, a gate signal, and a reactor current. It is a graph which shows the time change of a reactor current. It is a figure which shows the time change of a carrier, a gate signal, a midpoint potential, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the structure of 2nd Embodiment of the boost converter control apparatus which concerns on this invention. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the structure of 3rd Embodiment of the boost converter control apparatus which concerns on this invention. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the structure of 4th Embodiment of the boost converter control apparatus which concerns on this invention. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current. It is a figure which shows the time change of a carrier, a gate signal, and a reactor current.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]

  FIG. 1 is a diagram showing a configuration of a first embodiment of a boost converter control device according to the present invention. As shown in FIG. 1, a boost converter control device 1 according to this embodiment is for controlling a boost converter 2.

  Boost converter 2 is connected between battery 3 and inverter 4. Boost converter 2 includes upper arm transistor (first switching element) 21 and lower arm transistor (second switching element) 22 connected in series between power supply line 41 and ground line 42 of inverter 4. I have. The upper arm transistor 21 and the lower arm transistor 22 can be, for example, IGBTs (Insulated Gate Bipolar Transistors).

  The collector 21 c of the upper arm transistor 21 is connected to the power supply line 41 of the inverter 4, and the emitter 21 e of the upper arm transistor 21 is connected to the collector 22 c of the lower arm transistor 22. The emitter 22 e of the lower arm transistor 22 is connected to the ground line 42 of the inverter 4 and the negative electrode of the battery 3.

  Boost converter 2 further includes a reactor 23 having one end connected to connection portion P 0 of upper arm transistor 21 and lower arm transistor 22. The other end of the reactor 23 is connected to the positive electrode of the battery 3. Therefore, the emitter 21 e of the upper arm transistor 21 and the collector 22 c of the lower arm transistor 22 are connected to the positive electrode of the battery 3 via the reactor 23.

  Boost converter 2 further includes a diode 24 connected in the reverse direction from collector 21c to emitter 21e of upper arm transistor 21, and a diode 25 connected in the reverse direction from collector 22c of lower arm transistor 22 to emitter 22e. Yes.

  Boost converter 2 includes a main capacitor 26 connected in parallel to upper arm transistor 21 and lower arm transistor 22 between power supply line 41 and ground line 42 of inverter 4, and between the positive electrode and the negative electrode of battery 3. And a filter capacitor 27 connected to the.

  The boost converter 2 configured as described above boosts the voltage from the battery 3 by repeating the switching of the upper arm transistor 21 and the lower arm transistor 22 under the control of the boost converter control device 1, 4 can be stepped down.

  Boost converter control device 1 controls switching of upper arm transistor 21 and lower arm transistor 22 using current detection unit 11 that detects (monitors) reactor current IL flowing through reactor 23 and the detection result of current detection unit 11. And a control unit 12 for performing the above operation. The current detector 11 only needs to be able to detect the reactor current IL, and can be a known current sensor, for example.

  The control unit 12 includes a carrier generation unit 121, an AD control unit 122, an AD converter 123, a feedback control unit 124, and a gate signal generation unit 125. Such a control unit 12 is mainly configured by a computer system including a CPU, a RAM, a ROM, and the like. Moreover, the process of each part of the control part 12 is implement | achieved by running a predetermined program in the computer system.

  As illustrated in FIG. 2, the carrier generation unit 121 generates a reference signal (reference triangular wave) having a predetermined frequency called a carrier. The carriers generated by the carrier generation unit 121 can be used as a reference for switching control of the upper arm transistor 21 and the lower arm transistor 22 with a predetermined duty, for example. The carrier generation unit 121 transmits the generated carrier to the AD control unit 122 and the gate signal generation unit 125.

  The AD control unit 122 generates a sampling timing for sampling (detecting) the reactor current IL based on the carrier transmitted from the carrier generation unit 121, and sends a signal indicating the generated sampling timing to the AD converter 123. Send. For example, as shown in FIG. 2, the sampling timing is the timing of the peak of the carrier (in other words, the timing of the peak and valley of the carrier, in other words, each of the carrier having the maximum value and the minimum value). Timing).

  The AD converter 123 is activated according to the sampling timing generated by the AD control unit 122 and samples the reactor current IL using the current detection unit 11. If the sampling timing is the peak of the carrier, the current value of the reactor current IL obtained by this sampling is approximately the average value of the current values of the reactor current IL as shown in FIG.

  That is, the AD converter 123 obtains an average value of the current value of the reactor current IL by sampling the reactor current IL at a predetermined timing (for example, the peak of the carrier) under the control of the AD control unit 122. To do. Then, the AD converter 123 transmits a digital signal (ILAD value) indicating the acquired average value to the feedback control unit 124.

  The feedback control unit 124 uses the average value of the reactor current IL acquired by the AD converter 123 to calculate a correction value for setting the duty of the upper arm transistor 21 and the lower arm transistor 22 to desired values. To do. Then, the feedback control unit 124 transmits a signal (Duty) indicating the calculated correction value to the gate signal generation unit 125.

  The gate signal generation unit 125 controls the switching of the upper arm transistor 21 and the lower arm transistor 22 based on the carrier from the carrier generation unit 121 and the duty correction value from the feedback control unit 124. Q1 and Q2 are generated. Then, the gate signal generation unit 125 transmits the generated gate signal Q1 and the gate signal Q2 to the gate 21g of the upper arm transistor 21 and the gate 22g of the lower arm transistor 22, respectively.

  Thus, boost converter control device 1 samples reactor current IL at a predetermined timing to obtain an average value of the current value of reactor current IL, and performs current control in boost converter 2 using the average value. Do.

  Here, the current state of the reactor current IL includes a plurality of states including a power running state, a regenerative state, and a zero cross state. The power running state is a current state during the step-up operation of the boost converter 2, and as shown in FIG. 3A, the current value of the reactor current IL is always positive. The regenerative state is a current state in which step-up converter 2 is performing a step-down operation, and as shown in FIG. 3C, the current value of reactor current IL is always negative.

  The zero-cross state is a current state when the boost converter 2 switches from the boost operation to the step-down operation (or from the step-down operation to the boost operation). As shown in FIG. 3B, the current value of the reactor current IL is It is a state that changes across 0A and repeats positive and negative alternately around 0A. Here, the current value in the direction from the battery 3 to the inverter 4 is positive, and the opposite is negative.

  As described above, if the reactor current IL is sampled at the sampling timing of the peak of the carrier, an accurate average value can be obtained when the current state of the reactor current IL is a zero-cross state. On the other hand, when the current state of the reactor current IL is the power running state and the regenerative state, if the reactor current IL is sampled at the sampling timing at the top of the carrier, the obtained current value may not be an average value.

  That is, when the current state of the reactor current IL is the power running state and the regenerative state, the sampling timing at which the average value of the reactor current IL is obtained may deviate from the timing of the carrier apex.

  A more detailed description will be given with reference to FIG. 4 of the sampling timing deviation at which the average value of the reactor current IL is obtained. As shown in FIG. 4, here, the time C when the carrier is valley is set as the sampling timing. The midpoint potential shown in FIG. 4 is the potential of the connection portion P0 (that is, the voltage between the upper arm transistor 21 and the lower arm transistor 22).

  As shown in FIG. 4, the time C indicating the sampling timing here is an intermediate point between the time A and the time D. Time A is a time for turning off the lower arm transistor 22 when the upper arm transistor 21 is off, and time D is a time for turning off the upper arm transistor 21 when the lower arm transistor 22 is off. is there.

  As shown in FIGS. 4B to 4C, the current state of the reactor current IL is a power running state (see FIG. 4B), a zero-cross state (see FIG. 4C), and a regenerative state. The movement of the midpoint potential in the dead time DT (a period in which both the upper arm transistor 21 and the lower arm transistor 22 are off) differs depending on which of them is (see FIG. 4D).

  For this reason, the timing at which the current value of the reactor current IL switches between rising and falling also changes depending on whether it is in a power running state, a zero cross state, or a regenerative state. As a result, the sampling timing at which the average value of the reactor current IL is obtained may not be the time C when the carrier is valley.

  When the current state of the reactor current IL is the power running state, the sampling timing at which the average value of the reactor current IL is obtained is intermediate between the time A and the time E, as shown in FIG. It becomes a point. Time E is a time for turning on the lower arm transistor 22 after both the upper arm transistor 21 and the lower arm transistor 22 are turned off at time D.

  For this reason, when the current state of the reactor current IL is a power running state, when the reactor current IL is sampled at time C, the current value obtained by the sampling is greater than the average value of the current values of the reactor current IL. Slightly larger value.

  On the other hand, when the current state of the reactor current IL is a zero cross state, the sampling timing at which the average value of the reactor current IL is obtained is the time A and the time D as shown in FIG. It becomes an intermediate point (time C).

  For this reason, when the current state of the reactor current IL is a zero cross state, if the reactor current IL is sampled at time C, the average value of the current values of the reactor current IL can be obtained.

  On the other hand, when the current state of the reactor current IL is the regenerative state, as shown in FIG. 4D, the sampling timing at which the average value of the reactor current IL is obtained is time B and time D. It becomes the middle point. Time B is a time for turning on the upper arm transistor 21 after both the upper arm transistor 21 and the lower arm transistor 22 are turned off at time A.

  For this reason, when the current state of the reactor current IL is the regenerative state, if the sampling of the reactor current IL is performed at time C, the current value obtained by the sampling is more than the average value of the current values of the reactor current IL. Slightly larger value.

  When the current state of the reactor current IL is the power running state and the regenerative state, the degree of deviation of the sampling timing from the time C at which the average value of the reactor current IL is obtained is determined by the dead time DT.

  That is, when the current state of the reactor current IL is the power running state and the regenerative state, the deviation from the sampling timing time C at which the average value of the reactor current IL is obtained is DT / 2.

  The boost converter control device 1 according to the present embodiment includes a configuration for correcting the deviation of the sampling timing from the top of the carrier as described above. That is, in the boost converter control device 1, the AD control unit 122 includes a start timing generation unit 122a and a current state determination unit 122b, as shown in FIG.

  The activation timing generation unit 122a generates the sampling timing for activating the AD converter 123 and sampling the reactor current IL based on the carrier from the carrier generation unit 121, and outputs a signal indicating the generated sampling timing to the AD converter 123.

  At the time of correcting the deviation of the sampling timing, the activation timing generation unit 122a samples the reactor current IL at time α and time β in the two adjacent dead times DT, for example, as shown in FIG. Generate sampling timing.

  Thereby, the AD converter 123 samples the reactor current IL at time α and time β, and acquires the current value IL (α) and current value IL (β) of the reactor current IL at time α and time β. It becomes. Then, the AD converter 123 transmits an electrical signal (ILAD value) indicating the acquired current value IL (α) and current value IL (β) to the current state determination unit 122b.

  Based on the current value IL (α) and the current value IL (β) of the reactor current IL from the AD converter 123, the current state determination unit 122b determines that the current state of the reactor current IL is a power running state, a zero cross state, and a regenerative state. It is determined which one is.

  When the current state of the reactor current IL is a power running state, as shown in FIG. 5B, both the current value IL (α) and the current value IL (β) are 0 A or more. On the other hand, when the current state of the reactor current IL is the zero cross state, as shown in FIG. 5C, the current value IL (α) is less than 0A and the current value IL (β) is 0A or more. . On the other hand, when the current state of the reactor current IL is the regenerative state, as shown in FIG. 5D, the current value IL (α) and the current value IL (β) are both less than 0A.

  Therefore, the current state determination unit 122b determines that the current state of the reactor current IL is the power running state when both the current value IL (α) and the current value IL (β) are 0 A or more, and the current value IL ( When α) is less than 0 A and the current value IL (β) is 0 A or more, it is determined that the current state of the reactor current IL is a zero-cross state, and the current value IL (α) and the current value IL (β) are When both are less than 0 A, it can be determined that the current state of the reactor current IL is the regenerative state.

  Then, the current state determination unit 122b transmits a signal indicating the determination result of the current state of the reactor current IL determined as described above to the activation timing generation unit 122a.

  The activation timing generation unit 122a corrects (changes) the sampling timing in order to obtain the average value of the current value of the reactor current IL according to the determination result of the current state of the reactor current IL by the current state determination unit 122b.

  More specifically, when the current state of the reactor current IL is the power running state and the regenerative state, the activation timing generation unit 122a samples the reactor current IL with a delay of DT / 2 from the top of the carrier. Correct sampling timing.

  In addition, the activation timing generation unit 122a does not correct the sampling timing when the current state of the reactor current IL is the zero-cross state (that is, the vertex of the carrier is set as the sampling timing).

  Thereby, the sampling timing of the reactor current IL is changed according to whether the current state of the reactor current IL is a power running state, a zero cross state, or a regenerative state.

  Then, the activation timing generation unit 122a transmits a signal indicating the sampling timing to the AD converter 123. Thereby, the AD converter 123 is started at the sampling timing changed (corrected) according to the current state of the reactor current IL, and performs sampling of the reactor current IL. As a result, the average value obtained by the AD converter 123 becomes accurate.

  As described above, the boost converter control device 1 according to the present embodiment can acquire the average value of the current values of the reactor current IL by sampling the reactor current IL at a predetermined sampling timing. For this reason, it is possible to perform feedback current control in boost converter 2 by using the acquired average value.

  In particular, the boost converter control device 1 determines the current state of the reactor current IL, and sets the sampling timing of the reactor current IL according to whether the current state is a power running state, a zero cross state, or a regenerative state. The correction is made from the top of the carrier, or the top of the carrier is set as the sampling timing without correction. For this reason, an accurate average value of the reactor current IL can be obtained. Therefore, according to this boost converter control device 1, appropriate current control in boost converter 2 is possible by using an accurate average value.

  When the current state of the reactor current IL is a power running state, as shown in FIG. 6A, the current value of the reactor current IL gradually decreases toward the time α and exceeds the time α. Later, during the dead time DT (between time α and time β), the current value of the reactor current IL may become 0A.

  In such a case, when the current value of the reactor current IL changes across 0 A as indicated by a broken line, the current value IL (α) and the current value IL (β) are both 0 A or more, The current state of the reactor current IL becomes the zero cross state.

  However, in reality, the current value of the reactor current IL changes as indicated by the solid line (because it does not cross 0 A), so the current state of the reactor current IL does not become a zero cross state. Therefore, the current state of the reactor current IL does not become a zero-cross state until the current value IL (α) becomes less than 0 A. If both the current value IL (α) and the current value IL (β) are 0 A or more, power running It can be determined that it is in a state.

  Similarly, when the current state of the reactor current IL is the regenerative state, the absolute value of the current value of the reactor current IL gradually decreases toward time β as shown in FIG. After exceeding β, the current value of the reactor current IL may approach 0 A during the dead time DT.

  In such a case, when the current value of the reactor current IL changes across 0 A as indicated by a broken line, the current value IL (α) and the current value IL (β) are both less than 0 A, The reactor current IL may be in a zero cross state.

  However, in reality, the current value of the reactor current IL changes as indicated by the solid line (because it does not cross 0 A), so the current state of the reactor current IL does not become a zero cross state. Accordingly, the current state of the reactor current IL does not become a zero-cross state until the current value IL (α) becomes equal to or greater than 0A. If both the current value IL (α) and the current value IL (β) are less than 0A, regeneration is performed. It can be determined that it is in a state.

[Second Embodiment]

  FIG. 7 is a diagram showing the configuration of the second embodiment of the boost converter control device according to the present invention. As shown in FIG. 7, the boost converter control device 5 according to this embodiment is for controlling the boost converter 2.

  The boost converter control device 5 according to the present embodiment is different from the boost converter control device 1 according to the first embodiment in that a control unit 52 is provided instead of the control unit 12. The control unit 52 is different from the control unit 12 in that an AD control unit 522 is provided instead of the AD control unit 122.

  The AD control unit 522 generates a sampling timing for sampling the reactor current IL based on the carrier transmitted from the carrier generation unit 121 and transmits a signal indicating the generated sampling timing to the AD converter 123.

  The AD converter 123 is activated in accordance with the sampling timing generated by the AD control unit 522 and samples the reactor current IL using the current detection unit 11. Then, the AD converter 123 transmits a digital signal (ILAD value) indicating the current value of the reactor current IL obtained by the sampling to the AD control unit 522.

  The AD control unit 522 calculates the average value of the reactor current IL based on the current value of the reactor current IL from the AD converter 123. Then, the AD control unit 522 transmits a signal indicating the calculated average value to the feedback control unit 124.

  Here, also in the boost converter control device 5 according to the present embodiment, in order to obtain an accurate average value of the current value of the reactor current IL, the current state of the reactor current IL is the power running state, the zero cross state, and the regenerative state. It is necessary to determine which one is.

  Boost converter control device 5 according to the present embodiment also has a configuration for determining the current state of reactor current IL. That is, in the boost converter control device 5, the AD control unit 522 includes a start timing generation unit 522a, a calculation unit 522b, and a current state determination unit 522c, as shown in FIG.

  The activation timing generation unit 522a generates a sampling timing for activating the AD converter 123 and sampling the reactor current IL based on the carrier from the carrier generation unit 121.

  More specifically, the activation timing generation unit 522a uses the vertex of the carrier as the sampling timing, generates a signal indicating the sampling timing, and transmits the signal to the AD converter 123. Furthermore, the activation timing generation unit 522a sets a time delayed by a time T from the top of the carrier as another sampling timing, generates a signal indicating the other sampling timing, and further transmits the signal to the AD converter 123.

  Here, as shown in FIG. 8, the time F of the carrier peak and the time H of the carrier valley are set as the above sampling timing, and the time G delayed by the time T from the time F and delayed by the time T from the time H. Time J is set as another sampling timing. The time T can be, for example, about 1/8 (for example, about 12 μs) of the carrier period TS (for example, about 10 kHz).

  Therefore, the AD converter 123 starts at time F, time G, time H, and time J, and samples the reactor current IL. The AD converter 123 includes a current value IL (F), a current value IL (G), a current value IL (H), and a current value IL obtained by sampling at each of time F, time G, time H, and time J. A digital signal indicating (J) is transmitted to the calculation unit 522b.

  The calculation unit 522b calculates the rate of change of the reactor current IL with time (that is, the slope of the reactor current IL in FIG. 8) based on the current value of the reactor current IL acquired by the AD converter 123. The slope of the reactor current IL can be calculated, for example, by obtaining (current value IL (G) −current value IL (F)) / (time G−time F).

  Then, the calculation unit 522b calculates the current value of the reactor current IL at each switching timing of the upper arm transistor 21 and the lower arm transistor 22 based on the slope of the reactor current IL calculated as described above, and each vertex of the carrier. And the current value of the reactor current IL at the timing delayed by DT / 2.

  More specifically, as illustrated in FIG. 9, the calculation unit 522b performs switching time K, time L, and time Q of the upper arm transistor 21 and the lower arm transistor 22 based on the slope of the reactor current IL. (Time S), time R (time U), time Y, and current value of reactor current IL at time Z are calculated, respectively, and time N and carrier peak delayed by DT / 2 from time M of the carrier valley The current value of reactor current IL at time W delayed by DT / 2 from time V is calculated.

  The time K is a time for turning off the lower arm transistor 22 when the upper arm transistor 21 is off. Time L is a time for turning on the upper arm transistor 21 after the lower arm transistor 22 is turned off at time K. Time Q and time S are times when the upper arm transistor 21 is turned off again after the upper arm transistor 21 is turned on at time L.

  The time R and the time U are times when the lower arm transistor 22 is turned on after the upper arm transistor 21 is turned off at the time Q and the time S. Time Y is a time for turning the lower arm transistor 22 off again after turning the lower arm transistor 22 on at time R and time U. Time Z is time for turning on the upper arm transistor 21 after turning off the lower arm transistor 22 at time Y.

  The current value of the reactor current IL at the time M of the carrier valley, the time P delayed by the time T from the time M, the time V of the carrier peak, and the time X delayed by the time T from the time V is determined in advance by the above sampling. Has been acquired.

  Therefore, calculation unit 522b acquires the current value of reactor current IL in all of time K to time Z shown in FIG. Then, the calculation unit 522b transmits a signal indicating the acquired current value to the current state determination unit 522c.

  The current state determination unit 522c determines whether the current state of the reactor current IL is a power running state, a zero cross state, or a regenerative state based on the current value of the reactor current IL acquired by the calculation unit 522b. According to the determination result, it is determined which of the time M, time N, time V and time W the current value of the reactor current IL is set as the average value. This operation of the current state determination unit 522c will be described more specifically.

  As shown in FIG. 9B, the current state determination unit 522c determines that the reactor current IL is equal to or greater than 0 A when the current value of the reactor current IL at the time R is less than 0 when the slope of the reactor current IL is less than 0. Is determined to be a power running state. In that case, current state determination unit 522c determines the current value of reactor current IL at time N delayed by DT / 2 from time M of the carrier valley as the average value of the current values of reactor current IL. .

  Further, as shown in FIG. 9C, the current state determination unit 522c determines that the reactor current IL is equal to or greater than 0 A when the slope of the reactor current IL is greater than 0 and the current value of the reactor current IL is 0 A or more. The current state of IL is determined as a power running state. In this case, the current state determination unit 522c determines the current value of the reactor current IL at the time W delayed by DT / 2 from the carrier peak time V as the average value of the current values of the reactor current IL. .

  On the other hand, as shown in FIG. 10B, the current state determination unit 522c, when the slope of the reactor current IL is less than 0, the sign of the current value of the reactor current IL at time K and the reactor current at time Q. If the sign of the current value of IL is different, the current state of the reactor current IL is determined to be a zero cross state. In this case, the current state determination unit 522c determines the current value of the reactor current IL at the carrier valley time M (= time N) as the average value of the current values of the reactor current IL.

  Further, as shown in FIG. 10C, the current state determination unit 522c has a sign of the current value of the reactor current IL at the time S and the reactor current at the time Y when the slope of the reactor current IL is larger than 0. If the sign of the current value of IL is different, the current state of the reactor current IL is determined to be a zero cross state. In this case, the current state determination unit 522c determines the current value of the reactor current IL at the carrier peak time V (= time W) as the average value of the current values of the reactor current IL.

  On the other hand, as shown in FIG. 11 (b), the current state determination unit 522c determines that the reactor current IL is less than 0 A when the slope of the reactor current IL is less than 0 and the current value of the reactor current IL is less than 0 A. The current state of IL is determined as the regenerative state. In that case, current state determination unit 522c determines the current value of reactor current IL at time N delayed by DT / 2 from time M of the carrier valley as the average value of the current values of reactor current IL. .

  Further, as shown in FIG. 11C, the current state determination unit 522c determines that the reactor current IL is less than 0A when the slope of the reactor current IL is larger than 0 and the current value of the reactor current IL is less than 0A. The current state of IL is determined as the regenerative state. In this case, the current state determination unit 522c determines the current value of the reactor current IL at the time W delayed by DT / 2 from the carrier peak time V as the average value of the current values of the reactor current IL. .

  As described above, the current state determination unit 522c determines whether the current state of the reactor current IL is the power running state, the zero cross state, or the regenerative state, and the current value of the reactor current IL according to the determination result. Since the average value is determined, an accurate average value can be obtained. Then, the current state determination unit 522c transmits a signal indicating the determined average value to the feedback control unit 124.

  As described above, in the boost converter control device 5 according to the present embodiment, as in the boost converter control device 1 according to the first embodiment, an appropriate current in the boost converter 2 can be obtained by using an accurate average value. Control becomes possible.

  The first and second embodiments described above describe one embodiment of the boost converter control device according to the present invention. The boost converter control device according to the present invention includes the boost converter control device 1 and the boost converter described above. It is not limited to the control device 5. The step-up converter control device according to the present invention can modify the step-up converter control device 1 and the step-up converter control device 5 without departing from the scope of the claims.

  For example, in the boost converter control device 1 according to the first embodiment, the current state determination unit 122b determines the current value of the reactor current IL when both the upper arm transistor 21 and the lower arm transistor 22 are off (dead time DT) (dead time DT). Although the current state of the reactor current IL is determined based on the current value IL (α) and the current value IL (β)), the present invention is not limited to this.

  For example, the current state determination unit 122b can be configured in the same manner as the current state determination unit 522c of the boost converter control device 5 according to the second embodiment. More specifically, similarly to the current state determination unit 522c, the current state determination unit 122b determines whether the current state of the reactor current IL is the power running state, the zero cross state, and the regeneration based on the rate of change of the reactor current IL with time. It can be set as the aspect which determines which is in a state. Therefore, if necessary, boost converter control apparatus 1 may have a configuration in which startup timing generation unit 122a is similar to startup timing generation unit 522a and further includes calculation unit 522b.

  [Third Embodiment]

  FIG. 12 is a diagram showing the configuration of the third embodiment of the boost converter control device according to the present invention. As shown in FIG. 12, the boost converter control device 7 according to this embodiment is for controlling the boost converter 2.

  The boost converter control device 7 according to the present embodiment is different from the boost converter control device 1 according to the first embodiment in that a control unit 72 is provided instead of the control unit 12. The control unit 72 is different from the control unit 12 in that an AD control unit 722 is provided instead of the AD control unit 122.

  The AD control unit 722 generates a sampling timing for sampling the reactor current IL based on the carrier transmitted from the carrier generation unit 121, and transmits a signal indicating the generated sampling timing to the AD converter 123.

  The AD converter 123 is activated according to the sampling timing generated by the AD control unit 722 and samples the reactor current IL using the current detection unit 11. Then, the AD converter 123 transmits a digital signal (ILAD value) indicating the current value of the reactor current IL obtained by the sampling to the AD control unit 722.

  The AD control unit 722 acquires the average value of the reactor current IL based on the current value of the reactor current IL from the AD converter 123. Then, the AD control unit 722 transmits a signal indicating the acquired average value to the feedback control unit 124.

  Here, also in the boost converter control device 7 according to the present embodiment, in order to obtain an accurate average value of the current value of the reactor current IL, the current state of the reactor current IL is the power running state, the zero cross state, and the regenerative state. It is necessary to determine which one is.

  Boost converter control device 7 according to the present embodiment has a configuration for determining the current state of reactor current IL and obtaining an average value of the current value of reactor current IL. That is, in the boost converter control device 7, the AD control unit 722 includes a start timing generation unit 722a, a current state determination unit 722b, and an average value acquisition unit 722c, as shown in FIG.

  The activation timing generation unit 722a generates a sampling timing for activating the AD converter 123 and sampling the reactor current IL based on the carrier from the carrier generation unit 121.

  More specifically, as illustrated in FIG. 13, the activation timing generation unit 722a starts the first dead time DT1 among the dead times when both the upper arm transistor 21 and the lower arm transistor 22 are off. Sampling timing is α and the end time γ, and the start time β and end time δ of the second dead time DT2, which is the dead time next to the first dead time DT1 in the dead time.

  At time α, the upper arm transistor 21 is turned off from the state in which the upper arm transistor 21 is on and the lower arm transistor 22 is off, so that the first dead time DT1 is started. At time γ, when the lower arm transistor 22 is turned on from the state where both the upper arm transistor 21 and the lower arm transistor 22 are turned off, the first dead time DT1 ends.

  At time β, the second dead time DT2 is started by turning off the lower arm transistor 22 from the state in which the upper arm transistor 21 is off and the lower arm transistor 22 is on. At time δ, when the upper arm transistor 21 is turned on from the state where both the upper arm transistor 21 and the lower arm transistor 22 are turned off, the second dead time DT2 ends.

  The activation timing generation unit 722 a generates a signal indicating such sampling timing and transmits the signal to the AD converter 123. Therefore, the AD converter 123 starts at time α, time γ, time β, and time δ, and samples the reactor current IL. The AD converter 123 converts the current value IL (α), current value IL (γ), current value IL (β), and current value IL (δ) at time α, time γ, time β, and time δ, respectively. The digital signals (ILAD values) indicating them are transmitted to the current state determination unit 722b and the average value acquisition unit 722c.

  The current state determination unit 722b is a current value among the current value IL (α), the current value IL (γ), the current value IL (β), and the current value IL (δ) of the reactor current IL from the AD converter 123. Based on IL (α) and current value IL (β), it is determined whether the current state of reactor current IL is a power running state, a zero-cross state, or a regenerative state.

  The mode of current state determination in the current state determination unit 722b is the same as that of the current state determination unit 122b according to the first embodiment. That is, the current state determination unit 722b determines that the current state of the reactor current IL is the powering state when both the current value IL (α) and the current value IL (β) are 0 A or more, and the current value IL ( When α) is less than 0 A and the current value IL (β) is 0 A or more, it is determined that the current state of the reactor current IL is a zero-cross state, and the current value IL (α) and the current value IL (β) are When both are less than 0 A, it is determined that the current state of the reactor current IL is the regenerative state.

  Then, the current state determination unit 722b transmits a signal indicating the determination result of the current state of the reactor current IL determined as described above to the average value acquisition unit 722c. The average value acquisition unit 722c determines the current value IL (α), current value IL (γ), and current value IL of the reactor current IL from the AD converter 123 according to the result of the current state determination by the current state determination unit 722b. The average value of the reactor current IL is calculated (obtained) from (β) and the current value IL (δ).

  The calculation of the average value in the average value acquisition unit 722c will be described more specifically. When the current state of the reactor current IL is the power running state (see FIG. 15B), the average value acquisition unit 722c calculates the average value of the current value IL (γ) and the current value IL (β) as the reactor. Calculated as the average value of the current values of the current IL.

  Further, when the current state of the reactor current IL is the zero cross state (see FIG. 15C), the average value acquisition unit 722c calculates the average value of the current value IL (α) and the current value IL (β). The average value of the current values of the reactor current IL is calculated.

  Furthermore, when the current state of the reactor current IL is the regenerative state (see FIG. 15D), the average value acquisition unit 722c calculates the average value of the current value IL (α) and the current value IL (δ). The average value of the current values of the reactor current IL is calculated.

  Then, the average value acquisition unit 722c transmits a signal indicating the average value of the reactor current IL calculated as described above to the feedback control unit 124.

  As described above, the boost converter control device 7 determines the current state of the reactor current IL based on the current value of the reactor current IL acquired by the start timing generation unit 722a and the AD converter 123, and the result of the determination Accordingly, the average value of the reactor current IL is calculated from the current value of the reactor current IL acquired by the start timing generation unit 722a and the AD converter 123.

  For this reason, an accurate average value of the current value of the reactor current IL can be obtained. Therefore, according to this boost converter control device 7, appropriate current control in the boost converter can be performed by using an accurate average value. Further, according to the boost converter control device 7, the current state of the reactor current IL is determined from the current value of the reactor current IL acquired by the start timing generation unit 722a and the AD converter 123, and the current value of the reactor current IL is determined. The average value is calculated. For this reason, for example, after determining the current state of the reactor current IL, the average value after determining the current state of the reactor current IL is compared with a case where the reactor current IL is sampled again and the average value of the current value is calculated. Can be shortened. As a result, it is possible to obtain an average value in accordance with the actual current state of the reactor current IL.

  [Fourth Embodiment]

  FIG. 14 is a diagram showing the configuration of the fourth embodiment of the boost converter control apparatus according to the present invention. As shown in FIG. 14, the boost converter control device 9 according to the present embodiment is for controlling the boost converter 2.

  The boost converter control device 9 according to the present embodiment is different from the boost converter control device 1 according to the first embodiment in that a control unit 92 is provided instead of the control unit 12. The control unit 92 is different from the control unit 12 in that an AD control unit 922 is provided instead of the AD control unit 122.

  The AD control unit 922 generates a sampling timing for sampling the reactor current IL based on the carrier transmitted from the carrier generation unit 121, and transmits a signal indicating the generated sampling timing to the AD converter 123.

  The AD converter 123 is activated in accordance with the sampling timing generated by the AD control unit 922 and samples the reactor current IL using the current detection unit 11. Then, the AD converter 123 transmits a digital signal (ILAD value) indicating the current value of the reactor current IL obtained by the sampling to the AD control unit 922.

  The AD control unit 922 acquires the average value of the reactor current IL based on the current value of the reactor current IL from the AD converter 123. Then, the AD control unit 922 transmits a signal indicating the acquired average value to the feedback control unit 124.

  Here, also in the boost converter control device 9 according to the present embodiment, in order to obtain an accurate average value of the current value of the reactor current IL, the current state of the reactor current IL is the power running state, the zero-cross state, and the regenerative state. It is necessary to determine which one is.

  Boost converter control device 9 according to the present embodiment also has a configuration for determining the current state of reactor current IL and obtaining the average value of the current value of reactor current IL. That is, in the boost converter control device 9, the AD control unit 922 includes an activation timing generation unit 922a, a calculation unit 922b, a current state determination unit 922c, and an average value acquisition unit 922d as illustrated in FIG.

  The activation timing generation unit 922a generates a sampling timing for activating the AD converter 123 and sampling the reactor current IL based on the carrier from the carrier generation unit 121.

  More specifically, the activation timing generation unit 922a uses the time at the top of the carrier as a sampling timing, generates a signal indicating the sampling timing, and transmits the signal to the AD converter 123. Furthermore, the activation timing generation unit 922a sets a time delayed by the time T from the time at the top of the carrier as another sampling timing as necessary, generates a signal indicating the other sampling timing, and sends the signal to the AD converter 123. Send more. For example, as shown in FIG. 15A, the time T can be set to about 1/8 (for example, about 12 μs) of the carrier cycle TS (for example, about 10 kHz).

  Here, as will be described later, boost converter control device 9 according to the present embodiment determines the current state of reactor current IL based on the rate of change in reactor current IL over time. In order to calculate the rate of change of reactor current IL with time, it is necessary to obtain the current value of reactor current IL at at least two different times.

  Therefore, the operation differs depending on whether the current value of the reactor current IL at two different times is not obtained or when one of the current values of the reactor current IL at two different times is obtained in advance.

  When none of the current values of the reactor current IL at two different times is obtained, for example, as illustrated in FIG. 15B, the activation timing generation unit 922a includes the time M of the carrier valley and the time Two times of time P, which is delayed from time M by time T, are transmitted to the AD converter 123 as sampling timings.

  The AD converter 123 is activated at these two times M and P, and performs sampling of the reactor current IL, thereby acquiring the current value of the reactor current IL at these two times M and P. Then, the calculation unit 922b, based on the current value of the reactor current IL at these two times M and P, the ratio of the change in the current value of the reactor current IL with time (that is, the slope of the reactor current IL in FIG. 15B). ) Is calculated.

  More specifically, the calculation unit 922b calculates the slope of the reactor current IL by obtaining (current value at time P−current value at time M) / (time P−time M). Based on the calculated slope of the reactor current IL, the calculation unit 922b switches each timing of the upper arm transistor 21 and the lower arm transistor 22, that is, time K, time L, time Q (time S), and time R ( The current value of the reactor current IL at time U) is calculated.

  On the other hand, when one of the current values of the reactor current IL at two different times is obtained in advance, that is, the current value of the reactor current IL at the time U (time R) shown in FIG. If it has already been obtained in this way, only the current value of the reactor current IL at the carrier peak time V has to be newly acquired.

  For this reason, the activation timing generation unit 922a transmits the carrier peak time V to the AD converter 123 as the sampling timing. The AD converter 123 starts at that time V and samples the reactor current IL, thereby acquiring the current value of the reactor current IL at the time V.

  Then, the calculation unit 922b calculates the slope of the reactor current IL based on the current value of the reactor current IL at the time U that has already been obtained and the current value of the reactor current IL at the newly acquired time V. More specifically, the calculation unit 922b calculates the slope of the reactor current IL by obtaining (current value at time V−current value at time U) / (time V−time U).

  The calculation unit 922b calculates the current value of the reactor current IL at each timing of switching of the upper arm transistor 21 and the lower arm transistor 22, that is, at time Y and time Z, based on the calculated slope of the reactor current IL. The calculation unit 922b transmits a signal indicating the calculated current value of the reactor current IL to the current state determination unit 922c.

  Here, the time U is the end time of the first dead time DT1 in the dead time when both the upper arm transistor 21 and the lower arm transistor 22 are turned off. The time V is the time at the top of the carrier between the second dead time DT2 that is the next dead time after the first dead time DT1 and the first dead time DT1.

  Therefore, the AD converter 123 and the activation timing generation unit 922a are configured to generate the reactor current IL at the end time U of the first dead time DT1 in the dead time when both the upper arm transistor 21 and the lower arm transistor 22 are off. If the value is acquired in advance, only the time V at the top of the carrier between the second dead time DT2 next to the first dead time DT1 and the first dead time DT1 in the dead time. By sampling the reactor current IL, the current value of the reactor current IL at the time V is acquired.

  Further, when the current value of the reactor current IL at the end time U of the first dead time DT1 is obtained in advance, the calculating unit 922b obtains the reactor current IL at the end time U of the first dead time DT1. Of the current value of the reactor current IL at the time V and the ratio of the time variation of the current value of the reactor current IL is calculated.

  The current state determination unit 922c determines whether the current state of the reactor current IL is a power running state, a zero-cross state, or a regenerative state based on the current value of the reactor current IL acquired by the calculation unit 922b. A signal indicating the result is transmitted to the average value acquisition unit 922d. The operation of the current state determination unit 922c will be described more specifically.

  As shown in FIG. 15B, the current state determination unit 922c determines that the reactor current IL is equal to or greater than 0 A when the current value of the reactor current IL at time R is 0 A or less when the slope of the reactor current IL is less than 0. Is determined to be a power running state. Further, as shown in FIG. 15C, the current state determination unit 522c determines that the reactor current IL is equal to or greater than 0 A when the slope of the reactor current IL is greater than 0 and the current value of the reactor current IL is 0 A or more. The current state of IL is determined as a power running state.

  On the other hand, as shown in FIG. 16B, the current state determination unit 922c determines the sign of the current value of the reactor current IL at time K and the reactor current at time Q when the slope of the reactor current IL is less than 0. If the sign of the current value of IL is different, the current state of the reactor current IL is determined to be a zero cross state. In addition, as shown in FIG. 16C, the current state determination unit 922c determines the sign of the current value of the reactor current IL at time S and the reactor current at time Y when the slope of the reactor current IL is larger than 0. If the sign of the current value of IL is different, the current state of the reactor current IL is determined to be a zero cross state.

  On the other hand, as shown in FIG. 17B, the current state determination unit 922c determines that the reactor current IL is less than 0 A when the slope of the reactor current IL is less than 0 and the current value of the reactor current IL is less than 0 A. The current state of IL is determined as the regenerative state. Moreover, as shown in FIG. 17C, the current state determination unit 922c determines that the reactor current IL is less than 0 A when the slope of the reactor current IL is greater than 0 and the current value of the reactor current IL is less than 0 A. The current state of IL is determined as the regenerative state.

  Current state determination unit 922c transmits a signal indicating the current state of reactor current IL determined as described above to average value acquisition unit 922d.

  The average value acquisition unit 922d acquires the average value of the current value of the reactor current IL from the current value of the reactor current IL calculated by the calculation unit 922b according to the determination result of the current state determination unit 922c. The operation of the average value acquisition unit 922d will be described more specifically.

  When the current state of the reactor current IL is the power running state and the slope of the reactor current IL is less than 0 (see FIG. 15B), the average value acquisition unit 922d (the current of the reactor current IL at time K) Value) + (slope of reactor current IL) × (time R−time K) / 2 is calculated as an average value of the current values of reactor current IL. In addition, the average value acquisition unit 922d determines that the reactor current IL at time U (when the current state of the reactor current IL is a power running state and the slope of the reactor current IL is greater than 0 (see FIG. 15C)). Current value) + (slope of reactor current IL) × (time Y−time U) / 2 is calculated as an average value of the current values of reactor current IL.

  On the other hand, when the current state of the reactor current IL is the zero cross state and the slope of the reactor current IL is less than 0 (see FIG. 16B), the average value acquisition unit 922d (reactor current IL at time K) Current value) + (slope of reactor current IL) × (time Q−time K) / 2 is calculated as the average value of the current values of reactor current IL. In addition, the average value acquisition unit 922d determines that (reactor current IL at time S) when the current state of the reactor current IL is a zero-cross state and the slope of the reactor current IL is larger than 0 (see FIG. 16C). Current value) + (slope of reactor current IL) × (time Y−time S) / 2 is calculated as the average value of the current values of reactor current IL.

  On the other hand, when the current state of the reactor current IL is the regenerative state and the slope of the reactor current IL is less than 0 (see FIG. 17B), the average value acquisition unit 922d (reactor current IL at time L) Current value) + (slope of reactor current IL) × (time Q−time L) / 2 is calculated as an average value of the current values of reactor current IL. In addition, the average value acquisition unit 922d determines that the reactor current IL at time S (when the current state of the reactor current IL is in the regenerative state and the slope of the reactor current IL is greater than 0 (see FIG. 17C)). Current value) + (slope of reactor current IL) × (time Z−time S) / 2 is calculated as the average value of the current values of reactor current IL.

  The average value acquisition unit 922d transmits a signal indicating the average value of the reactor current IL calculated as described above to the feedback control unit 124.

  As described above, the boost converter control device 9 determines the current state of the reactor current IL based on the current value of the reactor current IL acquired by the start timing generation unit 922a and the AD converter 123, and the result of the determination Accordingly, the average value of the current value of the reactor current IL is acquired from the current value of the reactor current IL acquired by the start timing generation unit 922a and the AD converter 123. For this reason, an accurate average value of the current value of the reactor current IL can be obtained. Therefore, according to this boost converter control device 9, appropriate current control in boost converter 2 is possible by using an accurate average value.

  Further, according to boost converter control device 9, when calculating the rate of change in reactor current IL over time, the current value of reactor current IL at time U at the end of first dead time DT1 is acquired in advance. May be sampled only at time V at the top of the carrier. For this reason, for example, each time the rate of change in the reactor current IL is calculated, the control cycle is made faster than when sampling at two points, the time at the top of the carrier and the time delayed by time T from that time. And the duty can be extended.

  The third and fourth embodiments described above describe one embodiment of the boost converter control device according to the present invention. The boost converter control device according to the present invention includes the boost converter control device 7 and the boost converter described above. It is not limited to the control device 9. The step-up converter control device according to the present invention can modify the step-up converter control device 7 and the step-up converter control device 9 without departing from the scope of the claims.

  DESCRIPTION OF SYMBOLS 1,5,7,9 ... Boost converter control device, 2 ... Boost converter, 21 ... Upper arm transistor, 22 ... Lower arm transistor, 23 ... Reactor, 122a ... Startup timing generation part (average value acquisition means, timing correction means) , 122b ... current state determination unit (current state determination unit), 123 ... AD converter (average value acquisition unit, current value acquisition unit), 522a ... start-up timing generation unit (average value acquisition unit, current value acquisition unit), 522b ... Calculation unit (calculation unit, average value acquisition unit), 522c ... Current state determination unit (average value acquisition unit, current state determination unit), 722a ... Start-up timing generation unit (current value acquisition unit), 722b ... Current state determination unit (Current state determination means), 722c ... average value acquisition unit (average value acquisition means), 922a ... startup timing generation unit (current value acquisition means), 22b ... calculator (calculating means), 922c ... current condition determination section (current condition determination means), 922d ... average value acquisition unit (average value acquisition means).

Claims (7)

A boost converter control device for controlling a boost converter having first and second switching elements and a reactor connected to a connection portion between the first switching element and the second switching element,
Average value acquisition means for acquiring an average value of the reactor current by performing sampling of the reactor current flowing through the reactor at a predetermined timing;
Current state determination means for determining whether the current state of the reactor current is a power running state, a zero-cross state, or a regenerative state;
Timing correction means for correcting the predetermined timing according to the determination result of the current state determination means;
A boost converter control device.   Based on the reactor current when both the first switching element and the second switching element are off, the current state determination means determines that the current state of the reactor current is a power running state, a zero cross state, and The boost converter control device according to claim 1, wherein the boost converter control device determines which one is in a regenerative state.   The current state determination means determines whether the current state of the reactor current is a power running state, a zero-cross state, or a regenerative state based on a rate of time change of the reactor current. Boost converter control device. A boost converter control device for controlling a boost converter having first and second switching elements and a reactor connected to a connection portion between the first switching element and the second switching element,
Current value acquisition means for acquiring a current value of the reactor current by sampling the reactor current flowing through the reactor;
Based on the current value of the reactor current acquired by the current value acquisition means, current state determination means for determining whether the current state of the reactor current is a power running state, a zero cross state, or a regenerative state;
According to the determination result of the current state determination unit, an average value acquisition unit that acquires an average value of the current value of the reactor current from the current value of the reactor current acquired by the current value acquisition unit;
A boost converter control device.   The current value acquisition means starts and ends a first dead time in a dead time in which both the first switching element and the second switching element are off, and the first in the dead time. 5. The current value of the reactor current at each time is acquired by sampling the reactor current at each time of the start and end of the second dead time next to the dead time of 5. Boost converter control device. Based on the current value of the reactor current acquired by the current value acquisition means, further comprising a calculation means for calculating a rate of change of the reactor current with time,
The current state determination unit determines whether the current state of the reactor current is a power running state, a zero-cross state, or a regenerative state based on a rate of time change of the reactor current calculated by the calculation unit. The boost converter control device according to claim 4. The current value acquisition means acquires in advance the current value of the reactor current at the end time of the first dead time of the dead time in which both the first switching element and the second switching element are off. The reactor current is sampled at a predetermined time between the second dead time next to the first dead time and the first dead time of the dead time. , Obtain the current value of the reactor current at the predetermined time,
When the current value of the reactor current at the end time of the first dead time is obtained in advance, the calculating means calculates the current value of the reactor current at the end time of the first dead time and Based on the current value of the reactor current at the predetermined time, the ratio of the time change of the current value of the reactor current is calculated,
The boost converter control device according to claim 6, wherein the predetermined time is a time of an apex of a reference signal that is a reference of a switching timing of the first switching element and the second switching element.

Images