WO2015186404A1 - マルチフェーズ型dc/dcコンバータ及びマルチフェーズ型dc/dcコンバータシステム - Google Patents
マルチフェーズ型dc/dcコンバータ及びマルチフェーズ型dc/dcコンバータシステム Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
Definitions
- the present invention relates to a multi-phase DC / DC converter and a multi-phase DC / DC converter system.
- Multi-phase DC that can achieve maximum efficiency by connecting multiple DC / DC converters in parallel and switching the number of operating DC / DC converters in real time according to the size of the output load for higher output A / DC converter is known.
- This multi-phase DC / DC converter shifts the phase of switching control of the DC / DC converter according to the number of operating units, and supplies it to a load (for example, an electronic device or a battery) (for example, refer to Patent Document 1).
- an object of the present invention is to provide a multi-phase DC / DC converter and a multi-phase DC / DC converter system in which noise generated by switching does not affect the broadcast band.
- the present invention includes a plurality of converter units that perform power conversion in which an input unit and an output unit are connected in parallel, an output current detection unit that detects an output current, and the output current detected by the output current detection unit according to the output current
- An operating unit number determining unit that determines the operating unit number N of the converter unit, and a switching control unit that performs switching control of the converter unit of the operating unit number N determined by the operating unit determining unit at a switching frequency F so that the phases thereof are different from each other;
- the product of the operating number N and the switching frequency F is outside the range of the broadcast band.
- the product of the number N of operating units at the time of multi-phase control and the switching frequency F is outside the range of the broadcast band, so that noise generated by switching does not affect the broadcast band. .
- the product of the operating number N and the switching frequency F is lower than the broadcasting band, and when the operating number N is large, the product of the operating number N and the switching frequency F is It is preferably higher than the broadcast band.
- the switching frequency can be set within an appropriate range by setting the switching frequency F so as to jump over the broadcast band according to the number N of operating units.
- the operation number determination unit discontinuously increase or decrease the operation number N so that the switching frequency F is within an appropriate range.
- the number of operating units can be increased / decreased while avoiding the number of operating units associated with the switching frequency F outside the proper range where loss or the like may increase.
- the switching control unit has a spread spectrum function for changing the switching frequency F in a predetermined range, and the product of the number of operating units N at any frequency within the fluctuation range of the switching frequency is a broadcast band. It is preferably out of range.
- This configuration provides a noise reduction effect due to spectrum spreading.
- noise generated by switching during multi-phase control can be prevented from affecting the broadcast band.
- Circuit diagram of DC / DC converter according to Embodiment 1 Block diagram showing the functions of the control unit Graph showing efficiency characteristics with respect to output current Io Diagram showing the efficiency per converter unit when the number of operating units is increased in accordance with the increasing output current Io
- the figure for demonstrating the data table memorize
- FIG. 1 is a circuit diagram of a DC / DC converter 101 according to the first embodiment.
- the DC / DC converter 101 is a multiphase DC / DC converter that multiphase-controls a plurality of step-down converter circuits connected in parallel to step down an input voltage Vi to an output voltage Vo.
- the DC / DC converter 101 according to the present embodiment prevents noise generated during operation from affecting the AM broadcast band (510 kHz to 1.71 MHz) of the radio device.
- the radio device may be one that operates using the output of the DC / DC converter 101 as a power source, or is installed in the vicinity of a circuit or device that operates using the output of the DC / DC converter 101 as a power source. Also good.
- the DC / DC converter 101 includes a plurality of converter units 11A, 11B,. In FIG. 1, only three converter units 11A, 11B, and 11F are illustrated, but in the present embodiment, the DC / DC converter 101 is assumed to include six converter units. Then, according to the output current Io of the DC / DC converter 101, the number N of the six converter units is operated.
- the converter unit 11A is a step-down converter circuit including a switch element Q1 and an inductor L1 connected in series to an input power supply line, and a diode D1 connected between a connection point of the switch element Q1 and the inductor L1 and a ground line. It is.
- the switch element Q1 is, for example, an n-type MOS-FET.
- the other converter units 11B,..., 11F have the same configuration as the converter unit 11A.
- the plurality of converter units 11A, 11B,..., 11F are configured by connecting an input unit and an output unit in parallel.
- a filter capacitor C1 is provided on the input side of the plurality of converter units 11A, 11B,... 11F, and a smoothing capacitor C2 is provided on the output side.
- the DC / DC converter 101 includes current control units 12A, 12B,..., 12F, a voltage control unit 13, a clock generation unit 14, and a control unit 15 that control the switching of the plurality of converter units 11A, 11B,. Yes.
- the voltage control unit 13 includes an error amplifier 131, a phase compensation circuit including a capacitor C3 and a resistor R3, and a reference voltage source 132.
- Voltage dividing resistors R1 and R2 are connected to the output side of the DC / DC converter 101.
- the inverting input terminal ( ⁇ ) of the error amplifier 131 is connected to the connection point of the voltage dividing resistors R1 and R2, and the divided voltage of the output voltage Vo of the DC / DC converter 101 is input.
- the reference voltage source 132 is connected to the non-inverting input terminal (+) of the error amplifier 131, and the reference voltage Vref is input.
- the error amplifier 131 compares the output voltage Vo (specifically, the divided voltage) of the DC / DC converter 101 with the reference voltage Vref, and outputs an H level signal when the output voltage Vo is high. When the voltage Vo is low, an L level signal is output. The error amplifier 131 outputs an error signal to each of the plurality of current control units 12A, 12B,.
- the current control units 12A, 12B,..., 12F have the same configuration and are provided for each of the plurality of converter units 11A, 11B,.
- the current control units 12A, 12B,... 12F include an RS flip-flop (RSFF) 121 and a comparator 122.
- RSFF RS flip-flop
- the result of detecting the inductor current flowing to the inductor L1 is input to the non-inverting input terminal (+) of the comparator 122.
- the output terminal of the error amplifier 131 of the voltage control unit 13 is connected to the inverting input terminal ( ⁇ ), and an error signal output from the error amplifier 131 is input.
- the comparator 122 uses the signal input to the inverting input terminal ( ⁇ ) as a reference value and compares it with an inductor current (specifically, a voltage proportional to the inductor current).
- the comparator 122 outputs an H level signal to the R (reset) terminal of the RSFF 121 when the inductor current is higher than the reference value.
- the RSFF 121 of each of the current control units 12A, 12B,..., 12F has an output terminal (Q) connected to the gate terminal of each switch element Q1 of the converter units 11A, 11B,.
- the RSFF 121 is reset, that is, the switch element Q1 is turned off.
- the clock generation unit 14 is connected to the S (set) terminal of the RSFF 121, and the clock signal output from the clock generation unit 14 is input.
- the RSFF 121 sets the output terminal (Q) to the H level at the rising edge of the clock signal and turns on the switching element Q1 of the converter units 11A, 11B,. To.
- the clock generator 14 outputs a clock signal to the RSFF 121 of each of the current controllers 12A, 12B,.
- the clock generation unit 14 outputs a clock signal having a switching frequency F and a different phase to each of the current control units to be operated among the current control units 12A, 12B,.
- the clock generation unit 14 when operating the two current control units 12A and 12B, the clock generation unit 14 outputs a two-phase clock signal to the two current control units 12A and 12B.
- the current control units 12A and 12B to which the two-phase clock signal is input output drive signals having different phases from the output terminal (Q).
- the switch elements Q1 of the converter units 11A and 11B to which the drive signal is input are turned on alternately.
- currents whose phases are shifted by 180 ° are output from the converter units 11A and 11B.
- the currents output from the converter units 11A and 11B and whose phases are shifted by 180 ° are added and output from the DC / DC converter 101.
- FIG. 2 is a block diagram showing the functions of the control unit 15.
- the control unit 15 includes a current acquisition unit 151, an operation number determination unit 152, a frequency determination unit 153, a storage unit 154, and a control signal output unit 155.
- the current acquisition unit 151 acquires the output current Io of the DC / DC converter 101.
- An output current detection circuit 5 that detects an output current Io of the DC / DC converter 101 is provided on the output side of the DC / DC converter 101.
- the current acquisition unit 151 acquires the current value detected by the output current detection circuit 5.
- the operation number determination unit 152 determines the number N of the converter units 11A, 11B, ... 11F to be operated from the output current Io acquired by the current acquisition unit 151. For example, the operation number determination unit 152 increases the number N as the output current increases, and decreases the number N as the output current decreases.
- FIG. 3 is a graph showing efficiency characteristics with respect to the output current Io.
- the horizontal axis represents the output current [A] of one DC / DC converter 101
- the vertical axis represents efficiency (%).
- the maximum output current of the DC / DC converter 101 is 100A.
- the efficiency is highest when the output current is around 50A. Therefore, when a plurality of converter units 11A, 11B,... 11F are operated in parallel, high efficiency is maintained by switching the number of operating units so that the output per converter unit is around 50A (40A to 70A). be able to.
- FIG. 4 is a diagram showing the efficiency per converter unit when the number of operating units is increased in accordance with the increasing output current Io.
- FIG. 4 also shows the efficiency when the number of operating converters is six regardless of the output current Io for comparison.
- the DC / DC converter 101 can maintain high efficiency.
- the operation number determination unit 152 determines the operation number as one. In this case, only the converter unit 11A is driven, and the other converter units 11B,. As shown in FIG. 4, when only the converter unit 11 ⁇ / b> A is operated, the efficiency is higher than in the case where six converter units are operated without changing the number of units.
- the operation number determination unit 152 determines the operation number to be three. In this case, three units including the converter unit 11A are operated. As shown in FIG. 4, when three units are operated, the efficiency is higher than when six converter units are operated without changing the number of units.
- the operation number determination unit 152 determines the operation number to be six. In this case, all the converter units 11A, 11B,.
- the DC / DC converter 101 can maintain high efficiency by setting the number of operating units according to the output current Io.
- switching of the number of operating units may be provided with hysteresis so that the number of operating units is not frequently switched under a certain load.
- the switching threshold for the number of operating units is provided at 200A and 220A
- the number of operating units when the output current increases and the load becomes 210A is three, and the output current decreases and the load becomes 210A.
- the number of operating units is 4.
- the phase number P is set to the same value as the number N.
- the operation number determining unit 152 determines that six converter units 11A, 11B,..., 11F are to be operated, the number of phases is set to six. That is, the signals output from the six converter units 11A, 11B,..., 11F are shifted in phase by 60 degrees.
- the frequency determination unit 153 determines the switching frequency F of the switch element Q1 of the converter units 11A, 11B,... 11F from the operation number N determined by the operation number determination unit 152.
- the switching frequency F determined by the frequency determining unit 153 is determined such that the product of the number of operating units N is outside the range of the AM broadcast band (510 kHz to 1.71 MHz).
- the frequency determination unit 153 determines the switching frequency F based on the data table stored in the storage unit 154.
- FIG. 5 is a diagram for explaining a data table stored in the storage unit 154.
- This data table stores the number N of operations and the switching frequency F corresponding to the number N of operations.
- the product of the number N of operations and the switching frequency F is also shown.
- the switching frequency F is set to 200 kHz.
- the product of the number N of operations and the switching frequency F is 200 kHz and 400 kHz, which is outside the range of the AM broadcast band.
- the operating number N is 3, 4 and the operating number N is 1, 2
- the switching frequency F is set to 200 kHz
- the product of the operating number N and the switching frequency F is within the range of the AM broadcast band.
- the switching frequency F is set to 150 kHz and 125 kHz.
- the switching frequency F is set to 350 kHz and 300 kHz.
- the product of the number N of operations and the switching frequency F is 1750 kHz and 1800 kHz, which is outside the range of the AM broadcast band.
- the control signal output unit 155 outputs a control signal to the clock generation unit 14 based on the parameters set by the operation number determination unit 152 and the frequency determination unit 153, respectively. Based on the control signal from the control signal output unit 155, the clock generation unit 14 outputs a clock signal to the current control units 12A, 12B,.
- FIG. 6 is a diagram illustrating a drive signal for the switch element Q1 of each converter unit 11A to 11F when the number of operating units is 6.
- FIG. Converter units 11C, 11D, and 11E illustrated in FIG. 6 are converter units that are not illustrated in FIG. 1 among the six converter units 11A, 11B, and 11F.
- the drive signal is a PWM signal having a predetermined duty
- the switch element Q1 is turned on when the drive signal is at the H level and turned off when the drive signal is at the L level.
- the phase of the drive signal input to the switch element Q1 of the converter unit 11A and the drive signal input to the converter unit 11B is shifted by 60 °.
- the drive signal input to the switch element Q1 of the converter unit 11B and the drive signal input to the switch element Q1 of the converter unit 11C are out of phase by 60 °. Thereby, as shown in FIG. 6, it drives in order of converter part 11A, 11B, 11C, 11D, 11E, and 11F.
- FIG. 7 is a diagram showing currents at output points of the converter units 11A, 11B,... 11F when drive signals are inputted to the six converter units 11A, 11B,. is there.
- the horizontal axis represents the phase [deg]
- the vertical axis represents the normalized inductor current flowing through the inductor L1.
- the broken line, the dotted line, the alternate long and short dash line, and the two-dot chain line shown in FIG. 7 indicate the inductor currents of the converter units 11A, 11B,..., 11F, respectively, and the solid line is the total of the inductor currents.
- the 11F inductor current is 60 ° out of phase.
- FIG. 8 is a diagram showing the current when drive signals are input to the three converter units when the number of operating units is three. 6 and 7, the case where the number of operating units is six has been described, but the same applies to cases where the number of operating units is other than six. For example, when the number of operating units is 3, drive signals having different phases of 120 ° are input to the converter units 11A, 11B, and 11C. As shown in FIG. 8, the inductor currents of the three converter units are out of phase by 120 °.
- the DC / DC converter 101 can be multiphase controlled without the generated noise affecting the AM broadcast band.
- the AM broadcast band of 510 kHz to 1.71 MHz is used as the broadcast band.
- the band in which the product of the number of operating units N and the switching frequency F is out of the range It may cover all the regions where the products to be implemented are shipped or may vary depending on the shipping region.
- the change method may be to write stored data at the time of shipment, or to receive and change the data after shipment by communication or the like.
- the DC / DC converter 101 includes the six converter units 11A, 11B,... 11F, the number of converter units can be changed as appropriate.
- the number of phases P is the same as the number of operating units N determined by the operating unit determining unit 152, but it is sufficient that the relationship of the number of phases P ⁇ the number of operating units N is satisfied.
- the number of phases may be three, and two units may be controlled in the same phase.
- the product of the number of phases P and the switching frequency F is always set to be outside the range of the AM broadcast band.
- the frequency determination unit 153 determines the switching frequency F based on the data table stored in the storage unit 154, but the product of the number of operations N determined by the drive number determination unit 152 is the product. May be configured to calculate the switching frequency F so as to be out of the AM broadcast band range.
- a step-down converter is shown, but the present invention is not limited to this, and an insulating converter such as a step-up converter or a forward type may be used.
- the DC / DC converter according to the second embodiment has the same configuration as that of the first embodiment.
- the operation number determination unit 152 continuously increases the operation number N, such as one, two, and three.
- the operation number determination unit 152 increases the operation number N discontinuously. For example, when the number of operating units is 3, when the output current Io increases, the operating unit determining unit 152 does not increase the number of operating units in order of 4, 5, but increases the number of operating units from 3 units to 6 units. It may be. In this case, the operation number determination unit 152 determines the operation number N in consideration of the switching frequency F.
- each converter unit 11A, 11B,..., 11F there is an appropriate range for the switching frequency F, and problems occur when the switching frequency F is out of the range. For example, when the switching frequency F is low, abnormal operation or characteristic deterioration such as saturation of the inductor L1 and increase in copper loss occurs. Further, when the switching frequency F is high, the switching loss increases and the efficiency decreases.
- the appropriate range of the switching frequency F is set to 150 to 300 kHz.
- the operation number determination unit 152 determines the operation number N so that the switching frequency F is in the range of 150 to 300 kHz. For example, as shown in FIG. 5, when the number N of operations is 4 or 5, the switching frequency F is set to 125 kHz or 350 kHz.
- the operating unit determining unit 152 determines the operating unit N to be 6 instead of 4 or 5.
- the DC / DC converter according to Embodiment 3 will be described below.
- the DC / DC converter according to the present embodiment has the same configuration as that of the first and second embodiments.
- a spread spectrum method is used in which the switching frequency F is varied within a predetermined range (for example, ⁇ 5%) when switching control is performed on the switching elements Q1 of the converter units 11A, 11B,. .
- the frequency determination unit 153 causes the product of the number of operating units N to be outside the range of the AM broadcast band at any frequency within the variation range of the switching frequency F.
- the switching frequency (F ⁇ ⁇ f) is determined. Based on the data table stored in the storage unit 154, the switching frequency (F ⁇ ⁇ f) is determined.
- FIG. 9 is a diagram for explaining a data table stored in the storage unit 154.
- This data table stores the number N of operating units and the switching frequency (F ⁇ ⁇ f) corresponding to the number N of operating units.
- the table shown in FIG. 7 also shows the product of the number N of operation and the maximum value and the minimum value of the switching frequency (F ⁇ ⁇ f).
- the switching frequency F is set to (200 ⁇ 10) kHz.
- the product of the number of operating units N and the maximum value and the minimum value of the switching frequency (F ⁇ ⁇ f) is 210 kHz and 190 kHz, which is outside the range of the AM broadcast band.
- the switching frequency F is set to (375 ⁇ 18.75) kHz
- the product of the operating unit N and the maximum and minimum values of the switching frequency (F ⁇ ⁇ f) is 1968. 75 kHz and 1781.25 kHz, which are outside the range of the AM broadcast band.
- the switching frequency F is changed in a range of ⁇ 5%, but the fluctuation range of the switching frequency F may be changed according to the number N of operations.
- FIG. 10 is a circuit diagram of the DC / DC converter system according to the fourth embodiment.
- a DC / DC converter system (hereinafter referred to as a converter system) 201 includes two modules 20 and 30.
- the modules 20 and 30 have an input unit and an output unit connected in parallel, communicate via the serial bus 6, and perform switching synchronization via the synchronous pulse bus line 7. Since each of the modules 20 and 30 has substantially the same configuration, the module 20 will be mainly described below, and the same portions of the module 30 as the module 20 will be described with corresponding reference numerals in parentheses.
- Module 20 (30) includes three converter units 21A, 21B, and 21C (31A, 31B, and 31C).
- the converter units 21A, 21B, and 21C include the switch element and the inductor connected in series to the input power supply line, the connection point of the switch element and the inductor, and the ground line. It is a step-down converter circuit composed of a diode connected between the two.
- the plurality of converter units 21A, 21B, and 21C (31A, 31B, and 31C) are configured by connecting an input unit and an output unit in parallel.
- a filter capacitor C21 (C31) is provided on the input side of the plurality of converter units 21A, 21B, 21C (31A, 31B, 31C), and a smoothing capacitor C22 (C32) is provided on the output side.
- the module 20 (30) includes a switching control unit 22 (32) and a control unit 23 (33).
- the switching control unit 22 (32) receives the output voltage Vo divided by the voltage dividing resistors R21, R22 (R31, R32), and the current control unit, voltage control unit, and clock generation unit described in the first embodiment are used. I have.
- the current control unit is provided for each of the plurality of converter units 21A, 21B, and 21C (31A, 31B, and 31C).
- the switching control unit 22 (32) performs switching control of the switching elements of the converter units 21A, 21B, and 21C (31A, 31B, and 31C) at different phases in accordance with a control signal from the control unit 23 (33), thereby converting the converter unit 21A.
- 21B, 21C (31A, 31B, 31C) output signals having different phases.
- the out-of-phase currents output from the converter units 21A, 21B, and 21C (31A, 31B, and 31C) are added and output from the converter system 201.
- FIG. 11 is a block diagram illustrating functions of the control units 23 and 33.
- the control unit 23 includes a current acquisition unit 231, an operation number determination unit 232, a frequency determination unit 233, a storage unit 234, a control signal output unit 235, and a communication unit 236.
- the control unit 33 includes a current acquisition unit 331, a control signal output unit 332, and a communication unit 333.
- the communication units 236 and 333 communicate with the control units 23 and 33 via the serial bus 6.
- the control signal output units 235 and 332 synchronize switching control via the synchronization pulse bus line 7.
- the current acquisition units 231 and 331 of the control units 23 and 33 acquire the output currents Io1 and Io2 of the modules 20 and 30.
- output current detection circuits 24 and 34 for detecting the output currents Io1 and Io2 are provided.
- the current acquisition units 231 and 331 acquire the current values detected by the output current detection circuits 24 and 34.
- the current acquisition unit 231 of the control unit 23 acquires the output current Io2 acquired by the current acquisition unit 331 of the control unit 33 via the serial bus 6.
- the number-of-operations determination unit 232 of the control unit 23 is similar to the first embodiment among the converter units 21A, 21B, 21C, 31A, 31B, and 31C from the sum of the output currents Io1 and Io2 acquired by the current acquisition unit 231.
- the number N to be operated is determined.
- the operation number determination unit 232 increases the number N as the output current increases, and decreases the number N as the output current decreases.
- the number of phases P is set to be the same as the number of operating units N determined by the operating unit determining unit 232.
- the frequency determination unit 233 determines the switching frequency F of the switch element of the converter unit from the operation number N determined by the operation number determination unit 232.
- the switching frequency F determined by the frequency determining unit 233 is determined such that the product of the number of operating units N is outside the range of the AM broadcast band (510 kHz to 1.71 MHz).
- the frequency determination unit 233 determines the switching frequency F based on the data table stored in the storage unit 234.
- the control signal output unit 235 outputs a control signal to the clock generation unit based on the parameters set by the operation number determination unit 232 and the frequency determination unit 233, respectively.
- the clock generation unit outputs a clock signal to the current control unit based on the control signal from the control signal output unit 235, and the current control unit outputs a drive signal to the switch elements of the converter units 21A, 21B, and 21C.
- the operating unit determining unit 232 and the frequency determining unit 233 are used. Outputs the number of operating units and the frequency from the communication unit 236 to the control unit 33 via the serial bus 6. Further, the control signal output unit 235 outputs a synchronization signal to the control signal output unit 332 via the synchronization pulse bus line 7 so that the switching synchronization can be established between the module 20 and the module 30.
- the control signal output unit 332 of the control unit 33 to which these control signals are input includes the converter units 31A, 31B, and 31C, so that the converter units 31A, 31B, and 31C operate with phase differences from the converter units 21A, 21B, and 21C.
- a control signal is output to 31C.
- the control signal output unit 235 outputs a control signal so that the phases are shifted by 120 ° in the order of the converter units 21A, 21B, and 21C.
- the control signal output unit 332 outputs a control signal so that the phases are shifted by 120 ° in the order of the converter units 31A, 31B, and 31C.
- the converter unit 21A and the converter unit 31A are synchronized so that the phases are shifted by 60 °. Then, the phases of the converter units 21A, 31A, 21B, 31B, 21C, and 31C are shifted by 60 °.
- the converter system 201 includes the two modules 20 and 30, but may include three or more modules as necessary. In other words, the converter system 201 can change the number of modules according to the load, and the customizability is improved. Further, the number of converter units included in each of the modules 20 and 30 can be changed as appropriate.
- Converter unit 33 Control unit 50A ... Output current 101 ... DC / DC converter 121 ... RSFF 122: Comparator 131 ... Error amplifier 132 ... Reference voltage source 151 ... Current acquisition unit 152 ... Number of operation determination unit 153 ... Frequency determination unit 154 ... Storage unit 155 ... Control signal output unit 201 ... Converter system 231 ... Current acquisition unit 231, 331 ... Current acquisition unit 232 ... Number of operation determination unit 233 ... Frequency determination unit 234 ... Storage unit 235 ... Control signal output unit 235,332 ... Control signal output unit 236 ... Communication unit 236,333 ... Communication unit 331 ... Current acquisition unit 332 ...
- Control signal output unit 333 Communication unit
- C2 Smoothing capacitors
- C21 and C31 Filter capacitors
- C22 and C32 Smoothing capacitor
- Q1 Switch elements
- R1, R2, R21, R22, R31 , R32 ... Voltage dividing resistor R3 ... Resistance Vi ... Input Pressure Vo ... output voltage
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
図1は実施形態1に係るDC/DCコンバータ101の回路図である。
以下に、実施形態2に係るDC/DCコンバータについて説明する。本実施形態に係るDC/DCコンバータは、実施形態1と同じ構成である。実施形態1では、動作台数決定部152は、1台、2台、3台、、と動作台数Nを連続的に増大させている。これに対し、本実施形態では、動作台数決定部152は、動作台数Nを不連続に増大させる。例えば、動作台数が3台の場合、出力電流Ioが増えたときに、動作台数決定部152は動作台数を4台、5台と順に増やさず、動作台数を3台から6台へと増やすようにしてもよい。この場合、動作台数決定部152は、スイッチング周波数Fを考慮して動作台数Nを決定する。
以下に、実施形態3に係るDC/DCコンバータについて説明する。本実施形態に係るDC/DCコンバータは、実施形態1,2と同じ構成である。本実施形態では、各コンバータ部11A,11B,,,11Fのスイッチ素子Q1をスイッチング制御する際、スイッチング周波数Fを所定範囲(例えば、±5%)で変動させる、スペクトラム拡散方式を適用している。
実施形態4では、並列接続した複数のコンバータ部を有する複数のDC/DCコンバータモジュールを、入力部及び出力部それぞれを並列に接続して構成したDC/DCコンバータシステムの例を示す。
6…シリアルバス
7…同期パルスバスライン
11A…コンバータ部
11A,11B…コンバータ部
11A,11B,,,11F…コンバータ部
12A,12B,,,12F…電流制御部
13…電圧制御部
14…クロック生成部
15…制御部
20…モジュール
20,30…モジュール
21A,21B,21C…コンバータ部
21A,21B,21C,31A,31B,31C…コンバータ部
21A,31A,21B,31B,21C,31C…コンバータ部
22…スイッチング制御部
23,33…制御部
24,34…出力電流検出回路(出力電流検出部)
30…モジュール
31A,31B,31C…コンバータ部
33…制御部
50A…出力電流
101…DC/DCコンバータ
121…RSFF
122…コンパレータ
131…誤差増幅器
132…基準電圧源
151…電流取得部
152…動作台数決定部
153…周波数決定部
154…記憶部
155…制御信号出力部
201…コンバータシステム
231…電流取得部
231,331…電流取得部
232…動作台数決定部
233…周波数決定部
234…記憶部
235…制御信号出力部
235,332…制御信号出力部
236…通信部
236,333…通信部
331…電流取得部
332…制御信号出力部
333…通信部
C1…フィルタコンデンサ
C2…平滑コンデンサ
C21,C31…フィルタコンデンサ
C22,C32…平滑コンデンサ
C3…キャパシタ
D1…ダイオード
L1…インダクタ
Q1…スイッチ素子
R1,R2,R21,R22,R31,R32…分圧抵抗
R3…抵抗
Vi…入力電圧
Vo…出力電圧
Claims (9)
- 入力部及び出力部それぞれが並列接続された電力変換を行う複数のコンバータ部と、
出力電流を検出する出力電流検出部と、
前記出力電流検出部が検出した出力電流に応じて前記コンバータ部の動作台数Nを決定する動作台数決定部と、
前記動作台数決定部が決定した動作台数Nの前記コンバータ部を、互いに位相が異なるよう、スイッチング周波数Fでスイッチング制御するスイッチング制御部と、
を備え、
前記動作台数Nと前記スイッチング周波数Fとの積は、放送帯域の範囲外である、
マルチフェーズ型DC/DCコンバータ。 - 前記動作台数Nが少ない場合、前記動作台数Nと前記スイッチング周波数Fとの積は、前記放送帯域より低く、
前記動作台数Nが多い場合、前記動作台数Nと前記スイッチング周波数Fとの積は、前記放送帯域より高い、
請求項1に記載のマルチフェーズ型DC/DCコンバータ。 - 前記動作台数決定部は、スイッチング周波数Fが適正範囲内となるよう、前記動作台数Nを不連続に増加又は減少させる、
請求項1又は2に記載のマルチフェーズ型DC/DCコンバータ。 - 前記スイッチング制御部は、前記スイッチング周波数Fを所定範囲で変動させるスペクトラム拡散機能を有し、
スイッチング周波数の変動幅内の何れの周波数であっても、前記動作台数Nとの積は、放送帯域の範囲外である、
請求項1から3の何れかに記載のマルチフェーズ型DC/DCコンバータ。 - 入力部及び出力部それぞれが並列接続された電力変換を行う複数のコンバータ部を有するコンバータモジュールを複数備え、前記コンバータモジュールの入力部及び出力部それぞれが並列接続されたマルチフェーズ型DC/DCコンバータシステムにおいて、
前記コンバータモジュールは、請求項1~4のいずれかに記載のマルチフェーズ型DC/DCコンバータである、マルチフェーズ型DC/DCコンバータシステム。 - 入力部及び出力部それぞれが並列接続された電力変換を行う複数のコンバータ部を有するコンバータモジュールを複数備え、前記コンバータモジュールの入力部及び出力部それぞれが並列接続されたマルチフェーズ型DC/DCコンバータシステムにおいて、
出力電流を検出する出力電流検出部と、
前記出力電流検出部が検出した出力電流に応じて前記コンバータ部の動作台数Nを決定する動作台数決定部と、
前記動作台数決定部が決定した動作台数Nの前記コンバータ部を、互いに位相が異なるよう、スイッチング周波数Fでスイッチング制御するスイッチング制御部と、
を備え、
前記動作台数Nと前記スイッチング周波数Fとの積は、放送帯域の範囲外である、
マルチフェーズ型DC/DCコンバータシステム。 - 前記動作台数Nが少ない場合、前記動作台数Nと前記スイッチング周波数Fとの積は、前記放送帯域より低く、
前記動作台数Nが多い場合、前記動作台数Nと前記スイッチング周波数Fとの積は、前記放送帯域より高い、
請求項6に記載のマルチフェーズ型DC/DCコンバータシステム。 - 前記動作台数決定部は、スイッチング周波数Fが適正範囲内となるよう、前記動作台数Nを不連続に増加又は減少させる、
請求項6又は7に記載のマルチフェーズ型DC/DCコンバータシステム。 - 前記スイッチング制御部は、前記スイッチング周波数Fを所定範囲で変動させるスペクトラム拡散機能を有し、
スイッチング周波数の変動幅内の何れの周波数であっても、前記動作台数Nとの積は、放送帯域の範囲外である、
請求項6から8の何れかに記載のマルチフェーズ型DC/DCコンバータシステム。
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CN201580028185.XA CN106416034B (zh) | 2014-06-03 | 2015-03-17 | 多相型dc/dc转换器以及多相型dc/dc转换器系统 |
DE112015002622.3T DE112015002622T5 (de) | 2014-06-03 | 2015-03-17 | Multiphasen-Gleichspannungswandler und Multiphasen-Gleichspannungswandlersystem |
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