Control device for power supply device and control method for power supply device

Abstract

To stabilize the voltage of a flying capacitor, protect the flying capacitor and switching elements from overvoltage, and stabilize their operation.SOLUTION: A control device for a power supply device controls a power supply device including a flying capacitor, which includes a first switching element, a second switching element, and a capacitor, and the control device stops operation of the first switching element and the second switching element when the output current from the power supply device reaches a threshold value, and starts operation of the first switching element and the second switching element after a time that is an integer multiple of the switching period has elapsed since the control device has stopped the operation of the first switching element and the second switching element.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a control device for a power supply device and a control method for a power supply device. [Background technology]

[0002] Patent Document 1 discloses a technique for controlling the voltage balance of a converter using a flying capacitor system. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-225214 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology described in Patent Document 1 assumes that the inverter is operating correctly. To improve overload capability, the inverter has a peak limiter function that stops the output of a PWM (Pulse Width Modulation) signal by hardware when the output current value exceeds a threshold to protect each element from overcurrent. The peak limiter function resumes the output of the PWM signal when the output current value falls below the threshold. The peak limiter function repeatedly stops and resumes the output of the PWM signal, thereby protecting each element while supplying power to the load. Because this peak limiter function operates asynchronously with one switching cycle of the PWM signal, the operation timing of each switching element may be misaligned. This causes the voltage of each flying capacitor to fluctuate, potentially applying overvoltage to each flying capacitor and each switching element and causing damage. Furthermore, if the flying capacitor voltage cannot maintain the specified voltage, the intended voltage cannot be output.

[0005] The present disclosure aims to provide a power supply control device and a power supply control method that can stabilize the voltage of each flying capacitor included in a flying capacitor type power supply device, protect the flying capacitors and each switching element from overvoltage, and stabilize the operation of the power supply device even when the peak limiter function is activated. [Means for solving the problem]

[0006] A control device for a power supply device according to one embodiment of the present disclosure is a control device for controlling a power supply device including a flying capacitor having one or more arm circuits including at least one capacitor circuit, the drain of which is electrically connected to one end of the capacitor, the source of which is electrically connected to the drain of the second switching element, and the source of which is connected to the other end of the capacitor, the control device stops operation of the first switching element and the second switching element when the output current from the power supply device reaches a threshold, and starts operation of the first switching element and the second switching element after a time that is an integer multiple of a switching period has elapsed since the operation of the first switching element and the second switching element was stopped.

[0007] In a power supply control device according to the present disclosure, the control device comprises a switching control section, a limiter control section, a limiter recovery control section, a first comparison section, and a second comparison section, wherein the switching control section outputs a first level signal or a second level signal to an input of the second comparison section in accordance with a voltage command value or a current command value of the power supply device, the limiter control section outputs a first level signal to one input of the limiter recovery control section and the first comparison section when the output current of the power supply device is below a threshold, and outputs a second level signal to one input of the limiter recovery control section and the first comparison section when the output current of the power supply device reaches the threshold, and the limiter recovery control section outputs a first level signal to the other input of the first comparison section when receiving a first level signal from the limiter control section, and When a signal of a certain level is received, the first comparing unit outputs a signal of a second level to the other input of the first comparing unit, and when a time that is an integer multiple of the switching period of the first switching element and the second switching element has elapsed since receiving the signal of the second level, the first comparing unit outputs a signal of the first level to the other input of the second comparing unit, only when a signal of the first level is input to each of the one and the other inputs, and the second comparing unit outputs a signal of the first level to the first switching element and the second switching element, thereby operating the first switching element and the second switching element, and otherwise stopping the first switching element and the second switching element.

[0008] A control method for a power supply device according to one embodiment of the present disclosure is a control method for a power supply device including a flying capacitor having one or more arm circuits including at least one capacitor circuit, the drain of which is electrically connected to one end of the capacitor, the source of which is electrically connected to the drain of the second switching element, and the source of which is connected to the other end of the capacitor, the method stopping operation of the first switching element and the second switching element when an output current from the power supply device exceeds a threshold, and starting operation of the first switching element and the second switching element after a time that is an integer multiple of a switching period has elapsed since the operation of the first switching element and the second switching element was stopped. [Effects of the Invention]

[0009] According to the present disclosure, even if the peak limiter function operates in a flying capacitor type power supply device, the voltage of each flying capacitor provided in the power supply device can be stabilized, the flying capacitor and each switching element can be protected from overvoltage, and the operation of the power supply device can be stabilized. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a power supply device according to an embodiment. [Figure 2] FIG. 2 is a diagram for explaining a control method of the first arm circuit according to a comparative example. [Figure 3] FIG. 3 is a diagram for explaining a control method of the first arm circuit according to the embodiment. [Figure 4] FIG. 4 is a block diagram showing an example of the configuration of a control device according to a comparative example. [Figure 5] FIG. 5 is a diagram for explaining a switching operation according to a comparative example. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of the control device according to the embodiment. [Figure 7]FIG. 7 is a diagram for explaining the switching operation according to the embodiment. [Figure 8] FIG. 8 is a diagram showing a simulation waveform according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that the present disclosure is not limited to these embodiments, and in the following embodiments, the same components are designated by the same reference numerals, and redundant description will be omitted.

[0012] [Power supply] An example of the configuration of a power supply device according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the configuration of a power supply device according to an embodiment.

[0013] The power supply device 1 includes an inductor 4, an inductor 5, a capacitor 6, an ammeter 7, a first arm circuit 11, a second arm circuit 12, and a control device 100. The power supply device 1 is a flying capacitor type power supply device. The power supply device 1 receives a DC voltage output from a power supply 2 and smoothed by a capacitor 3, and outputs an AC voltage from output terminals 1a and 1b.

[0014] The first arm circuit 11 includes a switching element Q1, a switching element Q2, a switching element Q3, a switching element Q4, a switching element Q5, a switching element Q6, a flying capacitor FC1, and a flying capacitor FC2. The switching elements Q1 to Q6 are, for example, MOSFETs. The first arm circuit 11 is configured to be able to output voltages at four levels.

[0015] The second arm circuit 12 includes a switching element Q7, a switching element Q8, a switching element Q9, a switching element Q10, a switching element Q11, a switching element Q12, a flying capacitor FC3, and a flying capacitor FC4. The switching elements Q7 to Q12 are, for example, MOSFETs. The second arm circuit 12 is configured to be able to output voltages at four levels.

[0016] In this disclosure, each arm circuit is described as including six switching elements and two flying capacitors, but the present disclosure is not limited thereto. An arm circuit may include at least two switching elements and one flying capacitor. In this disclosure, a circuit including two switching elements and one flying capacitor may also be referred to as a capacitor circuit.

[0017] In the embodiment, each switching element is a MOSFET, but the present disclosure is not limited to this. Each switching element may be a silicon power device, a GaN power device, a SiC power device (e.g., an IGBT (Insulated Gate Bipolar Transistor)), or the like.

[0018] Each switching element has a parasitic diode (body diode) that can actively conduct current, or has a diode connected in antiparallel to it, which is the pn junction between the back gate of the MOSFET and the source and drain.

[0019] The drain of switching element Q1 is electrically connected to the high potential side of power supply 2 and the drain of switching element Q7. The source of switching element Q1 is electrically connected to the drain of switching element Q3. The source of switching element Q3 is electrically connected to the drain of switching element Q5. The source of switching element Q5 is electrically connected to the drain of switching element Q6. The source of switching element Q6 is electrically connected to the drain of switching element Q4. The source of switching element Q4 is electrically connected to the drain of switching element Q2. The source of switching element Q2 is electrically connected to the low potential side of power supply 2 and the source of switching element Q8.

[0020] One end of the flying capacitor FC1 is electrically connected to the source of the switching element Q1 and the drain of the switching element Q3, and the other end of the flying capacitor FC1 is electrically connected to the source of the switching element Q4 and the drain of the switching element Q2.

[0021] One end of the flying capacitor FC2 is electrically connected to the source of the switching element Q3 and the drain of the switching element Q5, and the other end of the flying capacitor FC2 is electrically connected to the source of the switching element Q6 and the drain of the switching element Q4.

[0022] The source of switching element Q7 is electrically connected to the drain of switching element Q9. The source of switching element Q9 is electrically connected to the drain of switching element Q11. The source of switching element Q11 is electrically connected to the drain of switching element Q12. The source of switching element Q12 is electrically connected to the drain of switching element Q10. The source of switching element Q10 is electrically connected to the drain of switching element Q8.

[0023] One end of flying capacitor FC3 is electrically connected to the source of switching element Q7 and the drain of switching element Q9, and the other end of flying capacitor FC3 is electrically connected to the source of switching element Q10 and the drain of switching element Q8.

[0024] One end of flying capacitor FC4 is electrically connected to the source of switching element Q9 and the drain of switching element Q11, and the other end of flying capacitor FC4 is electrically connected to the source of switching element Q12 and the drain of switching element Q10.

[0025] One end of the inductor 4 is electrically connected to the source of the switching element Q11 and the drain of the switching element Q12, and the other end of the inductor 4 is electrically connected to one end of the capacitor 6 and the output terminal 1a.

[0026] One end of the inductor 5 is electrically connected to the source of the switching element Q5 and the drain of the switching element Q6, and the other end of the inductor 5 is electrically connected to the other end of the capacitor 6 and the output terminal 1b.

[0027] The ammeter 7 is provided between the inductor 5 and the junction between the source of the switching element Q5 and the drain of the switching element Q6. The ammeter 7 detects the output current from the first arm circuit 11. The ammeter 7 outputs a detection signal S1 indicating the detection result of the output current to the control device 100.

[0028] The control device 100 outputs control signals to the first arm circuit 11 and the second arm circuit 12 to control the on / off of each switching element. The control device 100 includes, for example, an information processing device such as a DSP (Digital Signal Processor) with a built-in digital PWM (Pulse Width Modulation) circuit, a CPU (Central Processing Unit), or an MPU (Micro Processing Unit), and a storage device such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The control device 13 may be realized by, for example, an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The control device 100 may be realized by a combination of hardware and software.

[0029] [Arm circuit control method] Next, a description will be given of a control method for the first arm circuit 11. Note that a control method for the second arm circuit 12 is the same as the control method for the first arm circuit 11, and therefore a description thereof will be omitted.

[0030] The first arm circuit 11 includes flying capacitors FC1 and FC2 as flying capacitors. Here, it is assumed that the output voltage of the power supply 2 is E [V], the voltage of the flying capacitor FC1 is 2E / 3 [V], and the voltage of the flying capacitor FC2 is E / 3 [V]. The control device 100 controls the switching elements Q1 to Q6 to output voltages of four levels, 0 [V], E / 3 [V], 2E / 3 [V], and E [V], from the first arm circuit 11.

[0031] (Outline of the control method for the comparative example) 2 is a diagram illustrating a control method for the first arm circuit according to the comparative example. Waveform 201 represents the operating waveform of switching element Q1. Waveform 202 represents the operating waveform of switching element Q2. Waveform 203 represents the operating waveform of switching element Q3. Waveform 204 represents the operating waveform of switching element Q4. Waveform 205 represents the operating waveform of switching element Q5. Waveform 206 represents the operating waveform of switching element Q6. It is also assumed that the current output from the arm flows from the drain of switching element Q6 toward inductor 5.

[0032] During the period from timing t1 to timing t2, switching element Q1 is off, switching element Q2 is on, switching element Q3 is on, switching element Q4 is off, switching element Q5 is on, and switching element Q6 is off. During this period, flying capacitor FC1 is in a discharging state. The output voltage from the first arm circuit 11 is 2E / 3.

[0033] During the period from timing t2 to timing t3, switching element Q1 is off, switching element Q2 is on, switching element Q3 is off, switching element Q4 is on, switching element Q5 is on, and switching element Q6 is off. During this period, flying capacitor FC2 is in a discharging state. The output voltage from the first arm circuit 11 is E / 3.

[0034] During the period from timing t3 to timing t4, switching element Q1 is on, switching element Q2 is off, switching element Q3 is off, switching element Q4 is on, switching element Q5 is on, and switching element Q6 is off. During this period, flying capacitor FC1 is in a charged state, and flying capacitor FC2 is in a discharged state. The output voltage from the first arm circuit 11 is 2E / 3.

[0035] During the period from timing t4 to timing t5, switching element Q1 is on, switching element Q2 is off, switching element Q3 is off, switching element Q4 is on, switching element Q5 is off, and switching element Q6 is on. During this period, flying capacitor FC1 is in a charging state. The output voltage from the first arm circuit 11 is E / 3.

[0036] During the period from timing t5 to timing t6, switching element Q1 is on, switching element Q2 is off, switching element Q3 is on, switching element Q4 is off, switching element Q5 is off, and switching element Q6 is on. During this period, flying capacitor FC2 is in a charging state. The output voltage from the first arm circuit 11 is 2E / 3.

[0037] During the period from timing t6 to timing t7, switching element Q1 is off, switching element Q2 is on, switching element Q3 is on, switching element Q4 is off, switching element Q5 is off, and switching element Q6 is on. During this period, flying capacitor FC1 is in a discharging state, and flying capacitor FC2 is in a charging state. The output voltage from the first arm circuit 11 is E / 3.

[0038] During the period from timing t7 to timing t8, switching element Q1 is off, switching element Q2 is on, switching element Q3 is on, switching element Q4 is off, switching element Q5 is on, and switching element Q6 is off. During this period, flying capacitor FC1 is in a discharging state. The output voltage from the first arm circuit 11 is 2E / 3.

[0039] The operation shown from timing t1 to timing t8 corresponds to one switching cycle of switching elements Q1 to Q6. In the comparative example, the output voltage can be changed arbitrarily by arbitrarily changing the duty of waveforms 201 to 206. Generally, the charging time and discharging time of flying capacitor FC1 and flying capacitor FC2 coincide in one switching cycle, so operation is stable.

[0040] However, in reality, load fluctuations and input voltage fluctuations can cause the charge / discharge amounts of flying capacitors FC1 and FC2 to differ, resulting in fluctuations in the flying capacitor voltage and potentially preventing intended operation. As a result, an overvoltage exceeding the withstand voltage may be applied to the flying capacitors and switching elements Q1 to Q6. Therefore, as disclosed in JP 2017-225214 A, the flying capacitors are stabilized by adjusting the duty cycle. However, because the peak limiter function is performed asynchronously with the operation of each switching element during one switching cycle, the stabilization of the flying capacitor voltage through duty cycle adjustment may also fail, potentially disrupting the operation of switching elements Q1 to Q6, as indicated by waveforms 201 to 206. Therefore, in the comparative example, voltage fluctuations occur in flying capacitors FC1 and FC2, potentially applying overvoltage to flying capacitors FC1 and FC2 and switching elements Q1 to Q6, potentially resulting in damage. Furthermore, the output voltage may also be unintended.

[0041] Therefore, in the present disclosure, the voltage of flying capacitor FC1 and flying capacitor FC2 is stabilized, the flying capacitors and switching elements Q1 to Q6 are protected from overvoltage, and control is performed to stabilize the operation of the power supply device 1.

[0042] (Outline of control method of embodiment) 3 is a diagram illustrating a control method for the first arm circuit according to the embodiment. In FIG. 3, the operation from timing t11 to timing t18 corresponds to the operation of one switching cycle of switching elements Q1 to Q6. The operation from timing t18 to timing t25 corresponds to the operation of the next switching cycle of switching elements Q1 to Q6. The operation from timing t11 to timing t18 and the operation from timing t18 to timing t25 are the same as the operation from timing t1 to timing t8 shown in FIG. 2.

[0043] In the present disclosure, the control device 100 stops switching elements Q1 to Q6 when the output current from the first arm circuit 11 exceeds a threshold. After stopping switching elements Q1 to Q6, the control device 100 resumes operation of switching elements Q1 to Q6 one switching period later. In the example shown in FIG. 3 , the control device 100 detects an output current exceeding the threshold at timing t31 and stops operation of switching elements Q1 to Q6. The control device 100 resumes operation of switching elements Q1 to Q6 at timing t32, one switching period after timing t31. The section between timing t31 and timing t32 is a shut-off section in which operation of switching elements Q1 to Q6 is suspended.

[0044] (Control device of comparative example) 4 is a block diagram showing an example of the configuration of a control device according to a comparative example. The control device 100a includes a switching control section 101, a limiter control section 102, and an AND gate 103.

[0045] When switching elements Q1 to Q6 are turned ON in accordance with the voltage command value or the current command value, the switching control unit 101 outputs a high-level signal S2 to one of the input terminals of the AND gate 103. When switching elements Q1 to Q6 are turned OFF, the switching control unit 101 outputs a low-level signal S2 to one of the input terminals of the AND gate 103. That is, the signal S2 becomes a PWM signal output to each switching element, an example of which is shown in FIG.

[0046] The limiter control unit 102 receives a detection signal S1 indicating the output current of the first arm circuit 11 from the ammeter 7. If the detection signal S1 indicates that the output current is less than the threshold, the limiter control unit 102 outputs a high-level cutoff signal S3 to the other input terminal of the AND gate 103. If the detection signal S1 indicates that the output current is equal to or greater than the threshold, the limiter control unit 102 outputs a low-level cutoff signal S3 to the other input terminal of the AND gate 103. The high level is also called a first level. The low level is also called a second level.

[0047] The AND gate 103 outputs a high-level operation signal S4 to the first arm circuit 11 when the signal S2 is at a high level and the blocking signal S3 is at a high level, and outputs a low-level operation signal S4 in other cases. Specifically, the operation signal S4 is input to the gates of switching elements Q1 to Q6. Switching elements Q1 to Q6 stop operating when a low-level operation signal S4 is input to their gates, and resume operation when a high-level operation signal S4 is input. The AND gate 103 is also called a first comparison unit.

[0048] Fig. 5 is a diagram for explaining the switching operation according to the comparative example. In Fig. 5, the horizontal axis represents time. A waveform 301 represents the output current of the first arm circuit 11. A dotted line 302 represents the threshold of the output current from the first arm circuit 11. A waveform 303 represents the interruption signal S3.

[0049] 5 , as shown in waveform 301, the output current value of the first arm circuit 11 increases between timing t41 and timing t42 and becomes equal to or greater than the threshold value at timing t42. The limiter control unit 102 outputs a high-level cutoff signal S3 between timing t41 and timing t42. The limiter control unit 102 outputs a low-level cutoff signal S3 at timing t42, and when the output current value from the first arm circuit 11 decreases by a predetermined amount or more, outputs a high-level cutoff signal S3 at timing t43. From timing t43 to timing t47, the limiter control unit 102 repeatedly outputs a high-level or low-level cutoff signal S3 depending on the magnitude of the output current output from the first arm circuit 11.

[0050] Switching elements Q1 to Q6 are stopped between timing t41 and timing t42, between timing t43 and timing t44, and between timing t45 and timing t46. Therefore, in the comparative example, the output current of the first arm circuit 11 decreases between timing t41 and timing t42, between timing t43 and timing t44, and between timing t45 and timing t46. That is, in the comparative example, switching elements Q1 to Q6 are repeatedly stopped and started. Therefore, the switching cycle of signal S2 and the stopping operation of switching elements Q1 to Q6 are asynchronous.

[0051] (Control device of embodiment) Fig. 6 is a diagram showing an example of the configuration of a control device according to an embodiment. As shown in Fig. 6, the control device 100 includes a switching control unit 101, a limiter control unit 102, an AND gate 103, a limiter recovery control unit 104, and an AND gate 105. The control device 100 differs from the control device 100a shown in Fig. 4 in that it includes the limiter recovery control unit 104 and the AND gate 105.

[0052] The limiter control unit 102 outputs the interruption signal S3 to the limiter recovery control unit 104 and one input terminal of the AND gate 105.

[0053] When the limiter recovery control unit 104 receives a high-level cutoff signal S3, it outputs a high-level recovery control signal S5 to the other input terminal of the AND gate 105. When the limiter recovery control unit 104 receives a low-level cutoff signal S3, it outputs a low-level recovery control signal S5 to the other input terminal of the AND gate 105 for a predetermined time. After the predetermined time has elapsed, the limiter recovery control unit 104 outputs a high-level recovery control signal S5 to the other input terminal of the AND gate 105. A value according to the design may be set in advance for the predetermined time.

[0054] The AND gate 105 outputs a high-level control signal S6 to the other input terminal of the AND gate 103 when the shutdown signal S3 is at a high level and the recovery control signal S5 is at a high level, and outputs a low-level recovery control signal S5 in other cases. The AND gate 105 is also called a second comparison unit.

[0055] FIG. 7 is a diagram illustrating a switching operation according to the embodiment. In FIG. 7, the horizontal axis represents time. A waveform 311 represents the output current of the first arm circuit 11. A dotted line 312 represents the threshold of the output current from the first arm circuit 11. A waveform 313 represents the shutoff signal S3. A waveform 314 represents the recovery control signal S5. A waveform 315 represents the timer operation. A dotted line 316 represents the timer threshold.

[0056] In the example shown in FIG. 7 , as shown by waveform 311, the output current value of the first arm circuit 11 increases between timing t51 and timing t52 and becomes equal to or greater than the threshold value at timing t52. The limiter control unit 102 outputs a high-level cutoff signal S3 between timing t51 and timing t52. The limiter control unit 102 outputs a low-level cutoff signal S3 at timing t52, and when the output current value from the first arm circuit 11 decreases by a predetermined amount or more, outputs a high-level cutoff signal S3 at timing t53. The limiter recovery control unit 104 outputs a high-level recovery control signal S5 between timing t51 and timing t52. The limiter recovery control unit 104 measures the time from timing t52 to timing t54, when the timer value reaches the threshold value. The time between timing t52 and timing t54 is the operating time for one cycle of each switching element. The limiter recovery control unit 104 outputs a low-level recovery control signal S5 between timing t52 and timing t54. After timing t54, the limiter recovery control section 104 outputs a high level recovery control signal S5.

[0057] Between timing t52 and timing t54, the operation of each switching element is stopped. Therefore, the output current from the first arm circuit 11 decreases between timing t52 and timing t54. After timing t54, the operation of each switching element is resumed. As a result, in the present disclosure, the operation of each switching element is restored at the point where the operation was stopped, and the operation of the inverter can be stabilized.

[0058] (Simulation waveform) FIG. 8 is a diagram showing simulation waveforms according to an embodiment. FIG. 8 shows simulation results when each switching element of the power supply device 1 shown in FIG. 1 is controlled by the control device 100 according to an embodiment. Waveform 401 represents the simulation result of the output current from the power supply device 1. Waveform 402 represents the simulation result of the output voltage of the power supply device 1. Waveform 403 represents the simulation result of the voltage of flying capacitor FC1. Waveform 404 represents the simulation result of the voltage of flying capacitor FC3. Waveform 405 represents the simulation result of the voltage of flying capacitor FC2. Waveform 406 represents the simulation result of the voltage of flying capacitor FC4.

[0059] As shown by waveform 401, the output current from power supply device 1 is controlled so as not to exceed the threshold in the region showing the upper and lower limit values. Therefore, as shown by waveforms 403 to 406, in the region where the output current from power supply device 1 shows the upper or lower limit value, the voltages of flying capacitors FC1 to FC4 are stable, and the operation of power supply device 1 is also stable.

[0060] As described above, the present disclosure can stabilize the flying capacitor voltage, protect the flying capacitor and the switching element from overvoltage, and stabilize their operation.

[0061] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the contents of these embodiments. Furthermore, the above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments. [Explanation of symbols]

[0062] 1 Power supply 2 power supply 3,6 Capacitor 4,5 Inductors 7 Ammeter 11 First arm circuit 12 Second arm circuit 100,100a Control device 101 Switching control section 102 Limiter control section 103,105 AND gate 104 Limiter recovery control section FC1,FC2,FC3,FC4 flying capacitors Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 switching elements

Claims

1. A control device for controlling a power supply device including a flying capacitor having one or more arm circuits including at least one capacitor circuit including a first switching element, a second switching element, and a capacitor, wherein the drain of the first switching element is electrically connected to one end of the capacitor, the source of the first switching element is electrically connected to the drain of the second switching element, and the source of the second switching element is connected to the other end of the capacitor, the control device stops operation of the first switching element and the second switching element when the output current from the power supply device reaches a threshold, and starts operation of the first switching element and the second switching element after a time that is an integer multiple of a switching period has elapsed since the control device stopped operation of the first switching element and the second switching element. Power supply control device.

2. the control device includes a switching control unit, a limiter control unit, a limiter recovery control unit, a first comparison unit, and a second comparison unit; the switching control unit outputs a signal of a first level or a signal of a second level to an input of a second comparison unit in accordance with a voltage command value or a current command value of the power supply device; the limiter control unit outputs a signal of a first level to one input of the limiter recovery control unit and the first comparison unit when the output current of the power supply device is less than a threshold, and outputs a signal of a second level to one input of the limiter recovery control unit and the first comparison unit when the output current of the power supply device reaches a threshold, the limiter recovery control section, when receiving a first level signal from the limiter control section, outputs a first level signal to the other input of the first comparison section, and when receiving a second level signal from the limiter control section, outputs a second level signal to the other input of the first comparison section, and outputs the first level signal to the other input of the first comparison section after a time that is an integer multiple of the switching periods of the first switching element and the second switching element has elapsed since receiving the second level signal; the first comparing section outputs a signal of a first level to the other input of the second comparing section only when a signal of a first level is input to each of the one and the other inputs; the second comparison unit outputs a signal of a first level to the first switching element and the second switching element only when a signal of a first level is input to one input and the other input, respectively, to operate the first switching element and the second switching element, and stops the first switching element and the second switching element in other cases; The control device for a power supply device according to claim 1 .

3. A control method for a power supply device including a flying capacitor having one or more arm circuits including at least one capacitor circuit including a first switching element, a second switching element, and a capacitor, the drain of the first switching element being electrically connected to one end of the capacitor, the source of the first switching element being electrically connected to the drain of the second switching element, and the source of the second switching element being connected to the other end of the capacitor, stopping operation of the first switching element and the second switching element when the output current from the power supply device exceeds a threshold, and starting operation of the first switching element and the second switching element after a time that is an integer multiple of a switching period has elapsed since the operation of the first switching element and the second switching element was stopped. A method for controlling a power supply.

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