WO2017149906A1 - Circuit d'alimentation à découpage - Google Patents

Circuit d'alimentation à découpage Download PDF

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Publication number
WO2017149906A1
WO2017149906A1 PCT/JP2016/088016 JP2016088016W WO2017149906A1 WO 2017149906 A1 WO2017149906 A1 WO 2017149906A1 JP 2016088016 W JP2016088016 W JP 2016088016W WO 2017149906 A1 WO2017149906 A1 WO 2017149906A1
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Prior art keywords
switching
power supply
circuit
transformer
supply circuit
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PCT/JP2016/088016
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English (en)
Japanese (ja)
Inventor
渡辺　悟
小林　伸一
博俊 江澤
モハメッド ジャハンギ アラム
衛 柴崎
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株式会社電菱
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Publication of WO2017149906A1 publication Critical patent/WO2017149906A1/fr

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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac

Definitions

  • the present invention relates to a switching power supply circuit having a DC / DC converter or the like, and more particularly to a switching power supply circuit that can reduce power loss and can be miniaturized.
  • FIG. 5A is a block diagram showing a configuration of a conventional switching power supply circuit
  • FIG. 5B is a circuit diagram showing a configuration of a conventional switching power supply circuit.
  • the switching power supply circuit 50 includes a switching circuit 52 that switches the DC power supply 40 and outputs a current to the primary winding of the transformer 60, and a primary winding and a secondary winding. , A transformer 60 that performs power conversion by magnetic coupling, and a diode bridge 65 that rectifies alternating current from the secondary winding of the transformer 60 into direct current.
  • the switching circuit 52 of the switching power supply circuit 50 is composed of switching elements such as MOSFETs, and two sets of switching elements connected in series are connected to the output terminal of the DC power supply 40. ing.
  • connection point of the two switching elements 53 and 54 connected in series is connected to one end of the primary winding 61 of the transformer 60, and the connection point of the other two switching elements 55 and 56 connected in series is the transformer.
  • 60 is connected to the other end of the primary winding 61.
  • the current input to the primary winding 61 of the transformer 60 is converted into AC power and output from the secondary winding 62 of the transformer 60.
  • the control circuit 75 controls the switching of the switching circuit 52 so that the switching elements 53 and 56 and the switching elements 54 and 55 are alternately turned on. Thereby, currents in different directions alternately flow in the primary winding 61 of the transformer 60.
  • FIG. 6A is a timing chart showing the switching operation of the switching circuit by the control circuit. 6A represents ON / OFF timings of the switching elements 53 and 56 by the control circuit, and Sb illustrated in FIG. 6A represents ON / OFF timings of the switching elements 54 and 55. As shown in FIG. 6A, the switching cycle at this time is T, and the switching frequency is f.
  • the secondary winding 62 of the transformer 60 is connected to the input terminal of a diode bridge 65 composed of diodes 66, 67, 68, 69 and is rectified by the diode bridge 65.
  • a current is output from the output end to the load 48 and the like.
  • the output terminal of the diode bridge 65 is connected to an electrolytic capacitor or the like as the smoothing circuit 80 that suppresses the ripple current. Further, an inductor is also connected to the smoothing circuit 80 as necessary.
  • FIG. 6B is a diagram showing a change in current output from the diode bridge.
  • the current waveform output from the diode bridge 65 includes a pulsating current having a period T synchronized with the switching frequency of the switching circuit 52.
  • a surge voltage may be generated on the output side due to the reactance of the transformer.
  • Patent Document 1 discloses a low-loss converter that can suppress a surge voltage generated on the output side of a rectifier circuit and increase the power conversion efficiency of the DC-DC converter.
  • semiconductor switching elements Q1 to Q4 are disposed between a DC power source and a transformer, and a rectifier circuit and an output smoothing circuit are disposed between the transformer and a load.
  • An RCD snubber circuit that absorbs a surge voltage is provided between the rectifier circuit and the output smoothing circuit.
  • the surge voltage included in the output side voltage of the rectifier circuit is absorbed by the snubber capacitor via the snubber diode, and the charge of the snubber capacitor is discharged via the snubber resistor and supplied as power to the load.
  • a transformer that performs power conversion from the primary side to the secondary side is used.
  • power conversion is usually performed using one transformer.
  • AC power output from the transformer is rectified by a diode bridge, but a pulsating current is generated in the rectified current in synchronization with the switching frequency of the switching circuit.
  • a current is supplied to the load, a voltage fluctuation occurs due to the pulsating current.
  • the switching frequency of the switching circuit that supplies AC power to the primary winding of the transformer is increased to suppress fluctuations in the output current.
  • increasing the switching frequency increases the loss generated in the switching element of the switching circuit.
  • an electrolytic capacitor which is a smoothing circuit, is provided between a diode bridge that converts alternating current output from the transformer into direct current and a load.
  • the ripple current value changes according to the magnitude of the DC power to be switched and the switching frequency.
  • flowing a non-standard ripple current through the electrolytic capacitor affects the life of the electrolytic capacitor.
  • an electrolytic capacitor having a large (rated) allowable ripple current value when the power required for the switching power supply is large and the switching frequency is low, it is required to use an electrolytic capacitor having a large (rated) allowable ripple current value.
  • an electrolytic capacitor having a large ripple current value has a large shape, which may make it difficult to reduce the size of the device.
  • a counter electromotive voltage is generated in a switching element (transistor, FET, IGBT, etc.) connected to the transformer when the switching period changes from ON to OFF during the switching period.
  • This counter electromotive voltage is proportional to the magnitude of the current flowing when the switching period is on.
  • a snubber circuit disclosed in Patent Document 1 can be provided on the output side.
  • the provision of a snubber circuit or the like increases the number of parts and may make it difficult to reduce the size.
  • switching power supply circuits are required to reduce the fluctuation value of the pulsating current generated in the output current, to reduce the size of electrolytic capacitors used in the smoothing circuit, and to reduce the size of the transformer.
  • switching power supply circuits used for portable devices are required to be small and light, but are also required to be thin.
  • the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a switching power supply circuit that can reduce or eliminate a rectifier device such as a capacitor without increasing switching loss. To do.
  • the switching power supply circuit of the present invention is provided on the primary side of the transformer and the transformer.
  • the DC power supply is switched to alternately supply currents of different directions to the primary side winding of the transformer.
  • N power supply circuit units provided with a switching circuit that flows and a bridge circuit that is provided on the secondary side of the transformer and converts the voltage output from the winding on the secondary side of the transformer into a direct current and rectifies it ( n is an integer of 2 or more), the input of the switching circuit of the n power supply circuit units is connected in parallel with the DC power supply, and the output terminals of the n bridge circuits are connected in series, and the switching The switching frequency in the circuit has n different phases, and the switching of the switching circuit is controlled so that the switching timing is different for each power supply circuit unit. And said that there was Unishi.
  • the switching power supply circuit of the present invention controls the switching of the switching circuit by shifting the phase of the switching frequency in the switching circuit by 180 / n degrees for each of the power supply circuit units.
  • the switching circuit is switched by 180 / n degrees from the other switching circuits, and the switching timing is different for each transformer.
  • the bridge circuit in the switching power supply circuit of the present invention is a diode bridge made of a diode.
  • the switching power supply circuit of the present invention has a switching phase control unit that controls the phase of the switching frequency of the switching circuit of each power supply circuit unit, and the switching phase control unit sets half of the cycle of the switching frequency to n.
  • the signal is generated by dividing the phase of the switching frequency by 180 / n degrees for each of the power supply circuit units based on the period divided into n.
  • the switching power supply circuit according to the present invention is characterized in that the output terminals of the n bridge circuits are connected in parallel instead of being connected in series.
  • the power supply circuit unit is formed by modularizing the switching circuit, the transformer, and the bridge circuit, and includes n power supply circuit units that are modularized. It is characterized by being.
  • the switching power supply circuit of the present invention is composed of n power supply circuit units that are modularized, and can increase or decrease n.
  • one transformer is used for the switching power supply, and the shape of the transformer used increases in proportion to the power handled.
  • desired power is divided into n transformers, and switching is performed for each transformer. For this reason, the power handled per transformer is 1 / n.
  • the apparatus can be miniaturized. Further, by reducing the size of the transformer, it is possible to reduce the size and weight of the transformer, and it is also possible to make the device thinner.
  • the switching power supply circuit of the present invention controls power conversion, which has conventionally been performed by one transformer, to n transformers and performs switching for each transformer.
  • the phase of the frequency at which the switching elements are switched is shifted by 180 / n degrees so that switching is performed at different timing for each transformer.
  • the frequency included in the output power can be increased by n times without increasing the frequency of each switching element.
  • the frequency of the ripple current is increased, and the fluctuation range of the ripple current can be reduced.
  • the switching elements transistors, FETs, IGBTs, etc.
  • a switching element can be selected.
  • the ripple current flowing through the electrolytic capacitor of the switching element can be reduced.
  • the input electrolytic capacitor between the power supply and the switching element flows through a ripple current corresponding to the power of the DC power supply to be switched and its switching frequency.
  • This ripple current affects the life of the electrolytic capacitor.
  • Electrolytic capacitors with a large rated ripple current are large in shape, have little market distribution, are expensive, and take a long time to deliver.
  • the frequency of the ripple current is increased by n times.
  • the ripple current of the electrolytic capacitor decreases as the frequency increases, the ripple current is reduced by increasing the frequency n times. For this reason, since a small electrolytic capacitor can also be used, the freedom degree of selection increases.
  • the smoothing circuit can be eliminated or the smoothing element in the smoothing circuit can be downsized.
  • the switching waveform voltage-converted by the transformer is rectified by the rectifier element, and the pulsating current component is smoothed by the smoothing circuit.
  • the desired power is divided into n transformers and different timings for each transformer. By controlling so as to perform switching at, the ripple voltage is reduced and the ripple current value is reduced. For this reason, the freedom degree of selection of smoothing elements (a choke coil, an electrolytic capacitor, etc.) increases, and this enables miniaturization.
  • FIG. 1 It is a block diagram which shows the structure of the switching power supply circuit by this invention. It is a figure which shows the circuit structure of the power supply circuit part in the switching power supply circuit by this invention. It is a figure which shows the timing of the control signal input into n switching circuits.
  • B is a figure which shows the change of the output current of the switching power supply circuit controlled by (a). It is a block diagram which shows the structure which connected the output terminal of the diode bridge in parallel with the switching power supply circuit which consists of n power supply circuits.
  • A) is a block diagram which shows the structure of the conventional switching power supply circuit
  • (b) is a circuit diagram which shows the structure of the conventional switching power supply circuit.
  • (A) is a timing diagram showing the switching operation of the switching circuit by the control circuit
  • (b) is a diagram showing the change of the current output from the diode bridge.
  • the switching power supply circuit can be composed of n power supply circuit portions that are modularized, it is possible to reduce the size.
  • FIG. 1 is a block diagram showing a configuration of a switching power supply circuit of a switching power supply device according to the present invention
  • FIG. 2 is a diagram showing a circuit configuration of a power supply circuit section in the switching power supply circuit according to the present invention.
  • the switching power supply circuit 1 switches the DC power input from the DC power supply 40, converts it to DC power having a predetermined voltage, and supplies it to the load 48 or the like n (n is
  • the power supply circuit unit 3 includes an integer of 2 or more and a phase control circuit 30 that controls each power supply circuit unit 3.
  • the power supply circuit unit 3 of the switching power supply circuit 1 switches the DC power input from the DC power supply 40 and converts it into AC power, and the AC power from the switching circuit 7.
  • the switching power supply circuit 1 has n power supply circuit units 3, and includes a switching circuit 7 and a rectifier circuit 20 connected to correspond to the transformer 16 of each power supply circuit unit 3. Have. In addition, n rectifier circuits 20 that are output units of the power supply circuit unit 3 are connected in series. Power is supplied to the load 48 and the like from both ends of the output where the rectifier circuit 20 is connected in series.
  • FIG. 2 is a diagram showing a circuit configuration of a power supply circuit section in the switching power supply circuit.
  • the switching circuit 7 includes switching elements 11, 12, 13, and 14 made of MOSFETs.
  • the switching element 11 and the switching element 12 are connected in series to the DC power supply 40, and switching is performed.
  • the element 13 and the switching element 14 are connected in series.
  • the diode connected to the MOSFET indicates a parasitic diode.
  • connection point between the switching element 11 and the switching element 12 is connected to one end of the primary winding 17 of the transformer 16, and a connection point between the switching element 13 and the switching element 14 is the other end of the primary winding 17 of the transformer 16. It is connected to the.
  • the switching element 11 and the switching element 14 are turned on, and the switching element 13 and the switching element 12 are turned off, whereby a current flows in the direction indicated by ia in the transformer 16, and the switching element 13 and the switching element 12 are By turning on and turning off the switching element 11 and the switching element 14, a current flows through the transformer 16 in the direction indicated by ib.
  • the switching element is not limited to a MOSFET, and may be any electronic component that can turn on and off a circuit current with a control signal.
  • the switching element may be a transistor or an IGBT.
  • the three switching circuits are referred to as a first switching circuit, a second switching circuit, and a third switching circuit.
  • the phase control circuit 30 shown in FIGS. 1 and 2 applies a control signal (voltage) to the input of the switching element, for example, the gate of the MOSFET, and controls ON (conducting) and OFF (non-conducting) of the switching element. .
  • the phase control circuit 30 shown in FIG. 2 turns on the switching element 11 and the switching element 14 and controls the switching element 13 and the switching element 12 to be turned off at this time, while the switching element 13 and the switching element 12 are turned on. When the switch is turned on, the switching element 11 and the switching element 14 are controlled to be turned off.
  • the period from the start of the control signal ON to the end of the control signal is defined as a period T.
  • the switching frequency f is 1 / T.
  • the phase control circuit 30 inputs a control signal having a switching frequency having a period T for each switching circuit 7, and the switching circuit 7 repeats ON and OFF of the switching element according to the control signal.
  • phase control circuit 30 controls ON / OFF of the switching element with a phase difference of 180 / n degrees with respect to n (n is an integer of 2 or more) switching circuits 7.
  • FIG. 3A is a diagram illustrating timings of control signals input to the n switching circuits
  • FIG. 3B illustrates a change in output current of the switching power supply circuit controlled in FIG. 3A.
  • the control signal input to the switching circuit 7 is generated by the phase control circuit 30. As shown in FIG. 3A, the control signal input to the first switching circuit 7 has a switching cycle of T and a switching frequency of f. Similarly, the control signal input to the second switching circuit has a switching period T and a switching frequency f.
  • the control signal input to the nth switching circuit 7 has a switching cycle of T and a switching frequency of f.
  • the phase of the switching frequency input to the n-th switching circuit 7 is shifted by (n ⁇ 1) ⁇ 180 / n degrees with respect to the first switching circuit 7.
  • the phase control circuit 30 generates the phase difference between the control signals of the first switching circuit 7 and the second switching circuit 7 to be 180 / n degrees.
  • the switching frequency is generated so that the phase difference between the control signals of the (n ⁇ 1) th switching circuit 7 and the nth switching circuit 7 is 180 / n degrees.
  • the half of the period of the switching frequency is divided into n, and the switching frequency of each switching circuit 7 is controlled corresponding to the divided period.
  • the phase control circuit 30 divides the frequency by n by the frequency dividing circuit based on the frequency n times the switching frequency f, and the phase is 180 /
  • a control signal having a switching frequency f that differs n times may be generated for each switching circuit 7 and output.
  • the control signal generated by the phase control circuit 30 has a switching frequency of period T, and a frequency with a phase difference of 180 / n degrees is input to each switching circuit.
  • the transformers 16 do not switch at the same time, and a current including a ripple having a frequency n times the switching frequency f is output as shown in FIG. Also, the current fluctuation is reduced to 1 / n compared to the conventional case where only one transformer is used.
  • the n switching circuits 7 are controlled by the phase control circuit 30 at the same switching frequency. Further, the phase control circuit 30 is configured such that the phase of the switching frequency of each switching circuit 7 is different so that there is no switching circuit 7 that is turned ON / OFF at the same timing. Thereby, each transformer 16 is switched at a frequency with a different phase.
  • the switching frequency f is 100 kHz
  • the period is 10 microseconds (hereinafter referred to as ⁇ s)
  • the time corresponding to the phase of 180 degrees is 5 ⁇ s.
  • the total number n of the switching circuits 7 is 3, the phase is 60 degrees, and the time corresponding to the phase difference of 60 degrees is 5/3 ⁇ s.
  • the phase control circuit 30 shown in FIGS. 1 and 2 outputs a control signal having a frequency of 100 kHz to the first switching circuit 7, and a control signal of 100 KHz after 5/3 ⁇ s corresponding to a phase of 60 degrees. Is output to the second switching circuit 7. Further, after the switching circuit 72 is turned ON, a control signal of 100 kHz is output to the third switching circuit 7 after 5/3 ⁇ s.
  • the phase of the switching frequency if the total number n of the switching circuits 7 is 3, the phase is 180 / n degrees to 60 degrees.
  • the present invention is not limited to one numerical value of only 180 / n degrees.
  • the range is, for example, 55 degrees to 65 degrees with 60 degrees as the center.
  • an allowable range may be set for the phase of the switching frequency.
  • the switching circuit 7 switches the DC power supply according to the control signal from the phase control circuit 30 and converts it into AC power, and inputs the converted AC power to the primary winding 17 of the transformer 16.
  • the transformer 16 transmits AC power to the secondary winding 18 by magnetic coupling.
  • the AC power output from the secondary winding 18 of the transformer 16 is input to a rectifier circuit (diode bridge) 20 that converts AC power into DC power.
  • the rectifier circuit 20 includes a diode bridge, and a DC voltage is output from the output end of the diode bridge.
  • the diode bridge as the rectifier circuit 20 includes diodes 21, 22, 23, and 24, and the output terminal of the secondary winding 18 of the transformer 16 to the input terminals g and h of the diode bridge. Is supplied with power, and a rectified DC voltage is output from the output ends j and k of the diode bridge.
  • the DC voltage output from the diode bridge includes a ripple synchronized with the switching frequency f.
  • DC power is supplied to a load or the like from the output end of the diode bridge.
  • the switching circuit 7, the transformer 16 and the diode bridge 20 are modularized.
  • the switching circuit 7, the transformer 16 and the diode bridge 20 are formed on the substrate. It has been incorporated.
  • the modularized power supply circuit unit 3 includes power input terminals a and b for inputting a DC power supply 40, output terminals e and f for outputting rectified (smoothed) DC power, and control signals from the phase control unit 30. Input terminals c and d.
  • the modularized power supply circuit unit 3 is composed of the same circuit, the same parts, and the same size substrates. For this reason, the switching power supply device 1 can be configured by using a plurality of modularized power supply circuit units 3. Each power supply circuit unit 3 is controlled by the phase control unit 30.
  • the switching power supply circuit 1 has n output ends of the diode bridge 20 that is a rectifier circuit, and can supply DC power to a load or the like by connecting the output ends in series or in parallel.
  • the output voltage of one power supply circuit unit 3 includes one transformer 16. 1 / n of the switching power supply circuit 1 having the same capacity.
  • the capacity of the transformer 16 is small, and the transformer 16 and the module substrate can be miniaturized. Moreover, since the rated voltage and current of semiconductor elements such as MOSFETs and power diodes used in switching circuits and diode bridges can be reduced, it is easy to obtain.
  • the switching power supply circuit 1 has been described as using a plurality of modularized substrates, for example, the switching power supply circuit 1 may be composed of a substrate on which a plurality of circuits can be mounted.
  • the switching power supply circuit 1 is composed of n power supply circuit units 3 that are modularized. However, since n can be increased or decreased, the switching power supply circuit 1 can be adapted to the power capacity, size, etc. of the switching power supply circuit 1. N can be determined.
  • FIG. 1 is a block diagram showing a configuration in which the output terminals of a diode bridge are connected in series in a switching power supply circuit 1 composed of n power supply circuits.
  • the switching power supply circuit 1 has n output terminals of a diode bridge, and supplies DC power to a load or the like by connecting the output terminals in series. With respect to the voltage at the output terminal of each diode bridge at this time, a voltage n times as large is obtained as an output by connecting in series.
  • FIG. 4 is a block diagram showing a configuration in which the output terminals of the diode bridge are connected in parallel in a switching power supply circuit composed of n power supply circuit units.
  • the diode bridge has n output terminals, and the output terminals are connected in parallel to supply DC power to a load or the like.
  • the output current of the diode bridge of the power supply circuit section of one module is the same capacity switching power supply consisting of one transformer. 1 / n of the circuit 50 (shown in FIG. 5).
  • the output voltage has a switching frequency that is n times the switching frequency of each power supply circuit unit, and the ripple voltage and ripple current are also reduced. For this reason, since heat generation due to the ripple current of the smoothing capacitor can be suppressed, the size of the capacitor can be reduced.
  • the switching power supply circuit of the present invention has n power supply circuit sections 3 (n is an integer of 2 or more) including a switching circuit, a transformer, and a diode bridge,
  • the phase of the frequency is shifted by 180 / n degrees for each of the power supply circuits to control the switching of the switching circuit, thereby switching the n transformers at different phases.
  • the transformer can be miniaturized. Conventionally, one transformer is used for the switching power supply, and the shape of the transformer used increases in proportion to the power to be handled. In the present invention, desired power is divided into n transformers, and switching is performed for each transformer.
  • the power handled per transformer is 1 / n. Therefore, since a small transformer can be used, the apparatus can be miniaturized. Further, by reducing the size of the transformer, it is possible to reduce the size and weight of the transformer, and it is also possible to make the device thinner.
  • the ripple current flowing in the electrolytic capacitor can be reduced.
  • a DC power supply is switched using one transformer as in a conventional switching power supply circuit, a sudden voltage fluctuation may occur in the DC power supply due to switching.
  • stabilization is achieved by connecting an electrolytic capacitor for stabilizing the power supply between the DC power supply and the switching element.
  • a ripple current flows through the electrolytic capacitor in accordance with the power of the power source to be switched and its switching frequency.
  • This ripple current affects the life of the electrolytic capacitor.
  • An electrolytic capacitor having a large rated ripple current has a large shape, a small market distribution, high cost, and a long delivery time. Therefore, it is required to reduce the ripple current flowing through the electrolytic capacitor.
  • the frequency of the ripple current is increased by a factor of n by dividing the power conversion, which has conventionally been performed by one transformer, into n transformers and shifting the phase of switching the transformer.
  • the allowable ripple current value of an electrolytic capacitor tends to increase as the ripple frequency increases.
  • the ripple current value decreases as the switching frequency is increased by n times, so the degree of freedom in selecting an electrolytic capacitor can be increased. it can.
  • the smoothing element in the smoothing circuit can be deleted or downsized.
  • the switching waveform on the output side that is voltage-converted by the transformer is rectified by the rectifier circuit, and the pulsating current component is reduced by a smoothing circuit including an electrolytic capacitor or the like.
  • the present invention divides the power conversion conventionally performed by one transformer into n transformers and shifts the phase of switching the transformer, thereby increasing the ripple current frequency by a factor of n and reducing the ripple current value. .
  • a switching element such as a MOSFET connected to a transformer constituting a switching power supply
  • a counter electromotive voltage is generated by reactance of the transformer when the current is turned off during the switching period.
  • the counter electromotive voltage is proportional to the current that flows when the switching period is on.
  • the back electromotive voltage is also generated by a sudden current change due to high-speed switching.
  • the counter electromotive voltage greatly affects the absolute maximum rated voltage of the switching element. For this reason, it is necessary to use a switching element having a large absolute maximum rated voltage or to reduce the current flowing through the transformer.
  • the current flowing through each transformer becomes 1 / n.
  • the counter electromotive voltage applied to the switching element decreases in proportion to the decrease in current.
  • the market distribution is less, the cost is higher, and the delivery time is longer. Therefore, by dividing the desired power into n transformers, the optimal general-purpose products that are distributed in the market It is possible to select a suitable switching element.
  • switching loss of the switching element can be reduced. Since the switching element in the switching power supply circuit takes time to switch due to a delay in the turn-on operation and the turn-off operation with respect to the input ON and OFF control signals, a loss occurs at the time of switching.
  • the switching loss Psw is also increased by m times as shown in the equation (1).
  • the capacity of the transformer is small, and the transformer and the module substrate can be miniaturized.
  • the MOSFET used for the diode bridge, and the semiconductor element of the power diode can be lowered, the semiconductor element can be easily obtained.
  • Japanese Patent Laid-Open No. 2008-79403 discloses a low-loss converter that can suppress a surge voltage generated on the output side of a rectifier circuit and increase the power conversion efficiency of the DC-DC converter.
  • semiconductor switching elements Q1 to Q4 are disposed between a DC power source and a transformer, and a rectifier circuit and an output smoothing circuit are disposed between the transformer and a load.
  • An RCD snubber circuit that absorbs a surge voltage is provided between the rectifier circuit and the output smoothing circuit. The surge voltage included in the output side voltage of the rectifier circuit is absorbed by the snubber capacitor via the snubber diode, the electric charge of the snubber capacitor is discharged via the snubber resistor, and supplied to the load as electric power.
  • the current flowing through each transformer becomes 1 / n.
  • the counter electromotive voltage applied to the switching element decreases in proportion to the decrease in current.
  • the market distribution is less, the cost is higher, and the delivery time is longer. Therefore, by dividing the desired power into n transformers, the optimal general-purpose products that are distributed in the market It is possible to select a suitable switching element.
  • the smoothing circuit can be eliminated, or the smoothing element (electrolytic capacitor, choke coil, etc.) in the smoothing circuit can be reduced in size and the degree of freedom in selection can be increased. Also, it is possible to avoid providing a smoothing circuit by increasing n, which is the number of transformers to be used.
  • the present invention does not require an RCD snubber circuit that absorbs a surge voltage, and has a feature that is not found in the prior art documents.
  • Switching power supply circuit 3 Power supply circuit part 7, 52 Switching circuit 11, 12, 13, 14, 53, 54, 55, 56 Switching element (MOSFET) 16, 60 Transformer 17, 61 Primary winding 18, 62 Secondary winding 20, 65 Rectifier circuit (diode bridge) 21, 22, 23, 24, 66, 67, 68, 69 Diode 30 Phase control circuit 40 DC power supply 48 Load 80 Smoothing circuit (smoothing capacitor)

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Abstract

L'invention concerne un circuit d'alimentation à découpage permettant de réduire la taille d'un circuit de filtrage tel qu'un condensateur, ou de l'éliminer, sans augmenter la perte de commutation. Le circuit d'alimentation à découpage selon l'invention comprend n unités de circuit d'alimentation (3) (n étant un entier de 2 ou supérieur) comprenant : un transformateur (16) ; un circuit de commutation (7) entraînant le passage de courant de façon alternée dans différentes directions à travers un enroulement primaire du transformateur (16) ; et un circuit de pont disposé du côté secondaire du transformateur (16) et qui convertit la sortie de tension du transformateur (16) en courant continu et redresse le résultat. Une quantité souhaitée de puissance est divisée entre les n transformateurs (16), une commutation est réalisée dans chaque transformateur (16), les bornes de sortie des n circuits de pont sont connectées en série et les phases de la fréquence de commutation dans les circuits de commutation (7) sont décalées de 180/n degrés dans chacune des unités de circuit d'alimentation (3) afin de commander la commutation des circuits de commutation (7).
PCT/JP2016/088016 2016-03-02 2016-12-21 Circuit d'alimentation à découpage WO2017149906A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016039485A JP2017158305A (ja) 2016-03-02 2016-03-02 スイッチング電源回路
JP2016-039485 2016-03-02

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WO2017149906A1 true WO2017149906A1 (fr) 2017-09-08

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KR102020231B1 (ko) * 2017-03-08 2019-09-10 (주)에너캠프 휴대용 에너지 저장장치용 에너지 레벨 변환회로
KR20210034765A (ko) 2019-09-21 2021-03-31 이민호 노인우울증예방
JP2022087676A (ja) * 2020-12-01 2022-06-13 オムロン株式会社 残寿命予測装置及び残寿命予測方法

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JPS58179161A (ja) * 1982-04-14 1983-10-20 Fuji Elelctrochem Co Ltd スイツチングレギユレ−タの運転方法及びその回路
JPS62203555A (ja) * 1986-02-28 1987-09-08 Yokogawa Medical Syst Ltd 直流電源回路
JPS63268464A (ja) * 1987-04-23 1988-11-07 Nissin Electric Co Ltd 高圧直流電源装置
JP2004088814A (ja) * 2002-08-22 2004-03-18 Nissin Electric Co Ltd Ｄｃ−ｄｃコンバータ
WO2006027744A2 (fr) * 2004-09-08 2006-03-16 Eaton Corporation Convertisseur continu-continu a pont integral triphase monte en parallele sur le cote primaire
JP2006238695A (ja) * 2005-02-24 2006-09-07 En Technology Inc プラズマ発生用電源装置
JP2011142723A (ja) * 2010-01-06 2011-07-21 Nissin Electric Co Ltd Ｄｃ−ｄｃコンバータ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58179161A (ja) * 1982-04-14 1983-10-20 Fuji Elelctrochem Co Ltd スイツチングレギユレ−タの運転方法及びその回路
JPS62203555A (ja) * 1986-02-28 1987-09-08 Yokogawa Medical Syst Ltd 直流電源回路
JPS63268464A (ja) * 1987-04-23 1988-11-07 Nissin Electric Co Ltd 高圧直流電源装置
JP2004088814A (ja) * 2002-08-22 2004-03-18 Nissin Electric Co Ltd Ｄｃ−ｄｃコンバータ
WO2006027744A2 (fr) * 2004-09-08 2006-03-16 Eaton Corporation Convertisseur continu-continu a pont integral triphase monte en parallele sur le cote primaire
JP2006238695A (ja) * 2005-02-24 2006-09-07 En Technology Inc プラズマ発生用電源装置
JP2011142723A (ja) * 2010-01-06 2011-07-21 Nissin Electric Co Ltd Ｄｃ−ｄｃコンバータ

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