Classifications

• • 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

Definitions

• An embodiment of the present invention relates to a power supply device.
• power supply devices that convert the power supplied from a power source into DC power appropriate for a DC load, and then supply the converted DC power to the DC load.
• These power supply devices are equipped with a current control mode that controls the current supplied to the DC load to be constant, and a voltage control mode that controls the voltage supplied to the DC load to be constant, and are designed to allow arbitrary switching between the current control mode and the voltage control mode.
• Embodiments of the present invention provide a power supply device that can suppress large fluctuations in output current even when switching from current control mode to voltage control mode.
• a converter that converts power supplied from a power source into DC power corresponding to a DC load and supplies the converted DC power to the DC load; a current detector that detects the magnitude of the current of the DC power supplied from the converter to the DC load; a voltage detector that detects the magnitude of the voltage of the DC power supplied from the converter to the DC load; and a control device that controls the power conversion operation by the converter, wherein the control device has a current control mode that controls the operation of the converter to output a current of a constant magnitude according to a current command value, and a voltage control mode that controls the operation of the converter to output a voltage of a constant magnitude according to a voltage command value.
• the converter outputs a voltage command value in accordance with the final current command value, the voltage command value, the voltage detection value detected by the voltage detector, and the switching signal
• the control device arbitrarily switches between the current control mode and the voltage control mode based on the current command value, the voltage command value, the voltage detection value detected by the voltage detector, and the switching signal.
• the control device includes a current command value calculator that calculates a final current command value that indicates the magnitude of the current of the DC power to be supplied from the converter to the DC load, a current controller that calculates a final voltage command value that indicates the magnitude of the voltage to be output from the converter so that the current detection value detected by the current detector approaches the final current command value, and a voltage controller that causes the converter to output a voltage of a magnitude according to the final voltage command value.
• the current command value calculator calculates the current command value as the final current command value when the current control mode is set by the switching signal, and when the voltage control mode is set by the switching signal, calculates a current calculation value that represents the magnitude of a current to be output from the converter in order to bring the voltage detection value closer to the voltage command value, and calculates the current calculation value as the final current command value
• the current command value calculator further includes a subtractor that calculates a difference between the voltage command value and the voltage detection value, and a proportional-integral controller that performs proportional-integral control on the difference to calculate the calculated current value that indicates the magnitude of the current to be output from the converter in order to bring the detected voltage value closer to the voltage command value.
• the proportional-integral controller calculates the amount of change in the calculated current value based on the difference between the voltage command value and the detected voltage value, and calculates the current value of the calculated current value by adding the amount of change in the calculated current value to the previous value of the calculated current value.
• the proportional-integral controller calculates the final current command value as the calculated current value, and sets the previous value of the calculated current value as the final current command value.
• Embodiments of the present invention provide a power supply device that can suppress large fluctuations in output current even when switching from current control mode to voltage control mode.
• FIG. 1 is a block diagram schematically illustrating a power supply device according to an embodiment.
• FIG. 2 is a block diagram schematically illustrating a control device according to the embodiment.
• FIG. 2 is a block diagram schematically illustrating a current command value calculator according to the embodiment.
• FIG. 2 is a block diagram schematically illustrating a proportional-integral controller according to an embodiment.
• 4 is a graph schematically illustrating an example of the operation of the power supply device according to the embodiment.
• 10 is a graph schematically showing an example of the operation of a reference power supply device.
• FIG. 1 is a block diagram schematically illustrating a power supply device according to an embodiment.
• the power supply device 10 includes a converter 12 , a control device 14 , a current detector 16 , and a voltage detector 18 .
• the converter 12 is connected to the power source 2 and the DC load 4.
• the converter 12 converts the power supplied from the power source 2 into DC power compatible with the DC load 4, and supplies the converted DC power to the DC load 4.
• the power supply 2 supplies DC power to the converter 12.
• the converter 12, for example, converts the DC power supplied from the power supply 2 into another DC power corresponding to the DC load 4, and supplies the converted DC power to the DC load 4.
• the converter 12, for example, is a DC-DC converter.
• the power supply 2, for example, is another power conversion device that converts AC power supplied from an AC power system into DC power.
• the DC load 4 is, for example, an electrolytic cell that generates products such as hydrogen by performing electrolysis in response to a supply of DC power from the power supply device 10.
• the power supply device 10 (converter 12) causes the DC load 4, which is an electrolytic cell, to perform electrolysis by supplying DC power between the anode and cathode of the DC load 4.
• the DC load 4 is not limited to an electrolytic cell, and can be any load that requires a supply of DC power.
• the converter 12 has, for example, a pair of input terminals 20a and 20b, a pair of output terminals 20c and 20d, switching elements 21 and 22, rectifying elements 23 and 24, and a reactor 25.
• the converter 12 is connected to the power source 2 via a pair of input terminals 20a, 20b.
• One input terminal 20a is connected to the high-potential terminal of the power source 2, which is, for example, a DC power source.
• the other input terminal 20b is connected to the low-potential terminal of the power source 2, which is, for example, a DC power source.
• the DC power supplied from the power source 2 is input to the converter 12 via the pair of input terminals 20a, 20b.
• Switching elements 21, 22 have a pair of main terminals and a control terminal. Switching elements 21, 22 also have an on state and an off state.
• the on state is a state in which current flows between the pair of main terminals.
• the off state is a state in which current flow between the pair of main terminals is blocked.
• Each of switching elements 21, 22 switches between the on state and the off state depending on the voltage between the pair of main terminals and the voltage of the control terminal. Note that the off state is not limited to a state in which no current flows between the pair of main terminals, but may also be a state in which a weak current flows between the pair of main terminals within a range that does not affect the operation of converter 12.
• Switching elements 21 and 22 are, for example, self-excited semiconductor switching elements such as IGBTs or MOSFETs. However, switching elements 21 and 22 are not limited to this and may be any elements that can be arbitrarily switched between an on state and an off state.
• switching element 21 One main terminal of switching element 21 is electrically connected to input terminal 20a.
• the other main terminal of switching element 21 is electrically connected to one main terminal of switching element 22.
• Switching element 22 is connected in series with switching element 21.
• the other main terminal of switching element 22 is electrically connected to input terminal 20b.
• Switching elements 21 and 22 are connected in series between input terminals 20a and 20b. In other words, switching element 21 is provided between input terminals 20a and 20b, and switching element 22 is provided between switching element 21 and input terminal 20b.
• Rectifying element 23 is connected in anti-parallel to switching element 21.
• Rectifying element 24 is connected in anti-parallel to switching element 22.
• Rectifying elements 23 and 24 are, for example, diodes.
• the anodes of rectifying elements 23 and 24 are electrically connected to the low-potential side main terminals of switching elements 21 and 22, and the cathodes of rectifying elements 23 and 24 are electrically connected to the high-potential side main terminals of switching elements 21 and 22.
• the direction of current flowing through rectifying elements 23 and 24 (direction of rectification) is opposite to the direction of current flowing through switching elements 21 and 22.
• reactor 25 One end of reactor 25 is electrically connected to the connection point of switching elements 21 and 22. The other end of reactor 25 is electrically connected to one output terminal 20c. The other output terminal 20d is electrically connected to input terminal 20b.
• Converter 12 has switching elements 21 and 22, and converts DC power by switching the switching elements 21 and 22.
• Converter 12 is, for example, a step-down chopper circuit.
• Converter 12 converts DC power supplied from power source 2 into another DC power corresponding to DC load 4 by switching switching element 21, for example.
• Converter 12 outputs the converted DC power from a pair of output terminals 20c and 20d.
• Converter 12 is connected to DC load 4 via the pair of output terminals 20c and 20d.
• the converter 12 can boost the power on the DC load 4 side and supply it to the power source 2 side by switching the switching element 22.
• the configuration of the converter 12 is not limited to the above.
• the converter 12 may be, for example, a boost chopper circuit.
• the power supplied from the power source 2 to the converter 12 is not limited to DC power, and may be AC power or the like.
• the converter 12 may be, for example, an AC-DC converter that converts the AC power supplied from the power source 2 into DC power corresponding to the DC load 4 and supplies the converted DC power to the DC load 4.
• the power supplied from the power source 2 to the converter 12 may be any power.
• the converter 12 may be configured in any way that is capable of converting the power supplied from the power source 2 into DC power corresponding to the DC load 4.
• the converter 12 does not necessarily have to have the function of supplying power on the DC load 4 side to the power source 2 side.
• the current detector 16 detects the magnitude of the current of the DC power supplied from the converter 12 to the DC load 4 and inputs the detection result to the control device 14 as a current detection value.
• the voltage detector 18 detects the magnitude of the voltage of the DC power supplied from the converter 12 to the DC load 4 and inputs the detection result to the control device 14 as a voltage detection value.
• the control device 14 controls the power conversion operation by the converter 12.
• the control device 14 controls the power conversion operation by the converter 12, for example, by controlling the switching of each of the switching elements 21 and 22.
• the control device 14 generates control signals for controlling the switching of the switching elements 21 and 22, for example, based on the current detection value input from the current detector 16 and the voltage detection value input from the voltage detector 18, and controls the switching of each of the switching elements 21 and 22 by inputting the generated control signals to the converter 12.
• the control device 14 has a current control mode in which the power conversion operation by the converter 12 is controlled so that the current supplied to the DC load 4 is constant, and a voltage control mode in which the power conversion operation by the converter 12 is controlled so that the voltage supplied to the DC load 4 is constant.
• the control device 14 receives a switching signal and arbitrarily switches between current control mode and voltage control mode based on the input switching signal.
• the switching signal is input to the control device 14 from an external device such as a higher-level controller.
• the switching signal may also be input to the control device 14 based on manual operation by an operator from an operation unit connected to the control device 14.
• the method of inputting the switching signal to the control device 14 is not limited to the above, and any method that can appropriately input a switching signal to the control device 14 may be used.
• the current control mode and voltage control mode can be arbitrarily switched based on, for example, the state of the DC load 4.
• FIG. 2 is a block diagram schematically illustrating a control device according to the embodiment.
• the control device 14 includes a current command value calculator 30, a current controller 32, and a control signal generator .
• the current command value calculator 30 receives the voltage detection value and switching signal from the voltage detector 18, as well as a current command value representing the magnitude of the current of the DC power supplied from the converter 12 to the DC load 4, and a voltage command value representing the magnitude of the voltage of the DC power supplied from the converter 12 to the DC load 4.
• the current command value and voltage command value are input to the current command value calculator 30 from an external device or operation unit, for example, in the same way as a switching signal.
• the current command value and voltage command value may be, for example, fixed values that are preset in the current command value calculator 30 (control device 14).
• the method of inputting the current command value and voltage command value to the current command value calculator 30 is not limited to the above, and any method that can appropriately input the current command value and voltage command value to the current command value calculator 30 may be used.
• the current command value calculator 30 calculates a final current command value that indicates the magnitude of the DC power current supplied from the converter 12 to the DC load 4 based on the input current command value, voltage command value, voltage detection value, and switching signal, and inputs the calculated final current command value to the current controller 32.
• the current command value calculator 30 calculates the input current command value as the final current command value. This makes it possible to control the operation of the converter 12 so that it outputs a current of a substantially constant magnitude according to the current command value.
• the current command value calculator 30 calculates a calculated current value that represents the magnitude of the current to be output from the converter 12 in order to bring the detected voltage value closer to the voltage command value, and calculates the calculated current value as the final current command value. This makes it possible to control the operation of the converter 12 so that it outputs a voltage of a substantially constant magnitude according to the voltage command value.
• the current controller 32 receives the final current command value from the current command value calculator 30 and the current detection value from the current detector 16.
• the current controller 32 calculates a final voltage command value that indicates the magnitude of the voltage to be output from the converter 12 in order to bring the current detection value closer to the final current command value, and inputs the calculated final voltage command value to the control signal generator 34.
• the current controller 32 calculates the difference between the current detection value and the final current command value, and calculates the final voltage command value by, for example, calculating the difference between the current detection value and the final current command value, and performing proportional control (P control), proportional integral control (PI control), or proportional integral derivative control (PID control) on the calculated difference.
• P control proportional control
• PI control proportional integral control
• PID control proportional integral derivative control
• the control signal generator 34 generates a control signal for causing the converter 12 to output a voltage of a magnitude corresponding to the final voltage command value, and inputs the generated control signal to the converter 12.
• the control signal generator 34 calculates the switching duty ratio of the switching element 21, for example, by proportional calculation based on the magnitude of the voltage represented by the final voltage command value, and generates a PWM signal corresponding to the calculated duty ratio as a control signal.
• the converter 12 switches the switching element 21 in accordance with the input control signal. This allows the converter 12 to output a voltage of a magnitude corresponding to the final voltage command value.
• the control signal is not limited to a PWM signal, and may be any signal that can cause the converter 12 to output a voltage of a magnitude corresponding to the final voltage command value.
• the control signal may be set appropriately depending on the configuration of the converter 12, etc.
• FIG. 3 is a block diagram schematically illustrating a current command value calculator according to the embodiment.
• the current command value calculator 30 includes an output voltage control unit 40 , a switch 42 , and a change rate limiter 44 .
• the output voltage control unit 40 calculates a current calculation value that represents the magnitude of the current that should be output from the converter 12 in order to bring the detected voltage value closer to the voltage command value.
• the output voltage control unit 40 has a subtractor 50, a proportional-integral controller 52, and switches 54 and 56.
• the subtractor 50 receives the voltage command value and the detected voltage value.
• the subtractor 50 calculates the difference between the voltage command value and the detected voltage value, and inputs the calculated difference to the proportional-integral controller 52.
• the proportional-integral controller 52 performs proportional-integral control on the input difference to calculate a calculated current value that represents the magnitude of the current that should be output from the converter 12 in order to bring the detected voltage value closer to the voltage command value.
• the proportional-integral controller 52 (output voltage control unit 40) inputs the calculated current value to the switch 42.
• the proportional-integral control of the proportional-integral controller 52 may be, for example, proportional-integral-derivative control.
• the proportional-integral control calculation by the proportional-integral controller 52 may be any calculation that can appropriately calculate a current calculation value corresponding to the difference by performing at least a proportional calculation and an integral calculation on the difference.
• the proportional-integral controller 52 also has a limiter function that sets upper and lower limits on the calculated current value. In other words, the proportional-integral controller 52 sets upper and lower limits on the magnitude of the current to be output from the converter 12.
• the switch 54 receives the upper limit value of the current calculation value to be set in the proportional-integral controller 52 and the final current command value input from the current command value calculator 30 to the current controller 32.
• a switching signal is also input to the switch 54.
• the switch 54 inputs the upper limit value to the proportional-integral controller 52, and when the current control mode is set by the switching signal, the switch 54 inputs the final current command value to the proportional-integral controller 52.
• the switch 56 receives the lower limit value of the current calculation value to be set in the proportional-integral controller 52 and the final current command value input from the current command value calculator 30 to the current controller 32.
• a switching signal is also input to the switch 56.
• the switch 56 inputs the lower limit value to the proportional-integral controller 52, and when the current control mode is set by the switching signal, the switch 56 inputs the final current command value to the proportional-integral controller 52.
• proportional integral controller 52 When voltage control mode is set by a switching signal in response to inputs from switches 54 and 56, proportional integral controller 52 sets the upper limit value as the upper limit of the calculated current value and the lower limit value as the lower limit of the calculated current value. As a result, when voltage control mode is set, proportional integral controller 52 calculates a calculated current value in the range between the upper limit value and the lower limit value in response to the difference input from subtractor 50.
• the proportional-integral controller 52 sets both the upper and lower limits of the calculated current value to the final current command value.
• the proportional-integral controller 52 calculates the final current command value set as the upper and lower limits as the calculated current value, regardless of the difference input from the subtractor 50.
• the switch 42 receives the calculated current value input from the proportional-integral controller 52 (output voltage control unit 40), as well as a current command value. A switching signal is also input to the switch 42.
• the switch 42 When the voltage control mode is set by the switching signal, the switch 42 outputs the current calculation value calculated by the proportional-integral controller 52. On the other hand, when the current control mode is set by the switching signal, the switch 42 outputs a current command value.
• the change rate limiter 44 processes the current calculation value or current command value output from the switch 42 to limit changes per unit time to a predetermined amount or more, and outputs the processed current calculation value or current command value as the final current command value. This makes it possible to suppress sudden changes in the current output from the converter 12.
• the change rate limiter 44 is provided as needed and can be omitted.
• the output of the switch 42 may be output as the final current command value.
• the current command value calculator 30 calculates the current command value as the final current command value, and when the voltage control mode is set by the switching signal, it calculates the current calculation value representing the magnitude of the current that should be output from the converter 12 in order to bring the detected voltage value closer to the voltage command value as the final current command value.
• FIG. 4 is a block diagram schematically illustrating a proportional-integral controller according to the embodiment.
• the proportional-integral controller 52 includes a calculator 60 , a subtractor 61 , calculators 62 to 64 , adders 65 and 66 , a limiter 67 , and a calculator 68 .
• Calculator 60 receives the difference between the voltage command value input from subtractor 50 and the voltage detection value. Calculator 60 receives the difference input from subtractor 50 at each predetermined calculation cycle. Calculator 60 stores the previous value of the difference input at each predetermined calculation cycle, and inputs the stored previous value to subtractor 61 at each calculation cycle.
• Subtractor 61 receives the previous difference value from calculator 60 and the current difference value from subtractor 50. Subtractor 61 receives the previous and current difference values at each predetermined calculation cycle. Subtractor 61 calculates the difference between the previous and current values and inputs the calculated difference to calculator 62. In other words, subtractor 61 performs a differential operation to calculate the change from the previous time in the difference between the voltage command value and the voltage detection value.
• the calculator 62 calculates the control amount of the proportional control by multiplying the input difference by the proportional gain Kp , and inputs the calculated control amount of the proportional control to the adder 65.
• the calculator 62 calculates the control amount of the proportional control so as to make the difference between the previous value and the current value zero, for example.
• the difference between the voltage command value input from the subtractor 50 and the voltage detection value is input to the calculator 63.
• the calculator 63 receives the difference from the subtractor 50 at every predetermined calculation period.
• the calculator 63 multiplies the input difference by the calculation period ts and inputs the multiplied difference to the calculator 64.
• the calculator 63 calculates the integral of the difference between the voltage command value and the voltage detection value by multiplying the difference by the calculation period ts .
• the calculator 64 calculates the control amount of the integral control by multiplying the input difference by the proportional gain K i , and inputs the calculated control amount of the integral control to the adder 65.
• the calculator 64 calculates the control amount of the integral control so as to make the integral amount of the difference between the voltage command value and the voltage detection value zero, for example.
• Adder 65 adds the input proportional control control variable and integral control control variable, and inputs the added control variable to adder 66.
• This control variable represents the amount of change in the calculated current value required to bring the detected voltage value closer to the voltage command value.
• calculator 60, subtractor 61, calculators 62-64, and adder 65 calculate the amount of change in the calculated current value required to bring the detected voltage value closer to the voltage command value.
• the method for calculating the amount of change in the calculated current value is not limited to the above, and any method that can appropriately calculate the amount of change in the calculated current value may be used.
• the amount of change in the calculated current value may be calculated by further adding the control variable of differential control to the control variable of proportional control and the control variable of integral control described above.
• Calculator 68 receives the calculated current value output from proportional-integral controller 52 (limiter 67). Calculator 68 receives the calculated current value from limiter 67 at each predetermined calculation cycle. Calculator 68 stores the previous value of the calculated current value input at each predetermined calculation cycle, and inputs the stored previous value to adder 66 at each calculation cycle.
• Adder 66 calculates the calculated current value by adding the control variable input from adder 65 to the previous value of the calculated current value input from calculator 68. In other words, adder 66 calculates the current value of the calculated current value by adding the amount of change in the calculated current value to the previous value of the calculated current value. Adder 66 inputs the calculated current value to limiter 67.
• the limiter 67 receives the calculated current value from the adder 66, as well as the upper limit or final current command value of the calculated current value input from the switch 54, and the lower limit or final current command value of the calculated current value input from the switch 56.
• limiter 67 Based on the inputs from switches 54 and 56, limiter 67 sets the upper limit value to the upper limit of the calculated current value and the lower limit value to the lower limit of the calculated current value when voltage control mode is set, and sets both the upper and lower limits of the calculated current value to the final current command value when current control mode is set.
• the limiter 67 performs processing to limit the calculated current value to the upper limit when the calculated current value input from the adder 66 is equal to or greater than the set upper limit, and performs processing to limit the calculated current value to the lower limit when the calculated current value input from the adder 66 is equal to or less than the set lower limit, and inputs the processed calculated current value to the switch 42 and the calculator 68 as the final calculated current value.
• the proportional integral controller 52 calculates the amount of change in the calculated current value based on the difference between the voltage command value and the detected voltage value, and calculates the current value of the calculated current value by adding the amount of change in the calculated current value to the previous value of the calculated current value. In other words, the proportional integral controller 52 performs an integral operation on the calculated current value by sequentially adding the amount of change in the calculated current value to the previous value of the calculated current value.
• a proportional integral controller 52 is sometimes called, for example, a speed-type proportional integral controller.
• a speed-type proportional integral controller can suppress the occurrence of sudden changes (bumps) in the calculated current value, for example, when switching between voltage control mode and current control mode.
• a speed-type proportional integral controller can suppress the occurrence of windup, which is a decrease in the ability to follow the voltage command value as the control amount of integral control increases.
• the proportional integral controller 52 is a proportional integral controller with anti-windup.
• the proportional-integral controller 52 sets upper and lower limit values in the limiter 67, calculates the amount of change in the calculated current value based on the difference between the voltage command value and the detected voltage value, and calculates the current value of the calculated current value in the range between the upper and lower limit values by adding the amount of change in the calculated current value to the previous value of the calculated current value.
• the proportional-integral controller 52 sets both the upper and lower limits of the limiter 67 to the final current command value. As a result, when the current control mode is set, as described above, the proportional-integral controller 52 can calculate the final current command value as the current calculation value regardless of the difference input from the subtractor 50.
• the proportional-integral controller 52 can calculate the final current command value as the calculated current value, thereby making the previous value of the calculated current value stored in the calculator 68 the final current command value. In other words, in the current control mode, the proportional-integral controller 52 stops the integration action of the calculated current value by calculating the final current command value as the calculated current value.
• the configuration for causing the proportional-integral controller 52 to calculate the final current command value as the current calculation value is not limited to the above and may be any configuration.
• a path switch may be provided on the input side of the limiter 67, and instead of inputting the output of the adder 66 to the limiter 67, the final current command value may be input to the limiter 67.
• a path switch may be provided on the output side of the limiter 67, and instead of inputting the output of the limiter 67 to the switch 42 and the calculator 68, the final current command value may be input to the switch 42 and the calculator 68. In this way, when a switch is provided, the proportional-integral controller 52 does not necessarily have to have the limiter 67.
• FIG. 5 is a graph schematically illustrating an example of the operation of the power supply device according to the embodiment.
• FIG. 6 is a graph showing a schematic example of the operation of a reference power supply device.
• FIG. 6 shows a schematic example of the operation of the reference power supply device in which, in the current control mode as well as in the voltage control mode, the amount of change in the calculated current value is calculated based on the difference between the voltage command value and the voltage detection value, and the current value of the calculated current value is calculated by adding the amount of change in the calculated current value to the previous value of the calculated current value.
• FIGS. 5 and 6 show schematic examples of the current detection value Idet detected by the current detector 16, the voltage detection value Vdet detected by the voltage detector 18, and the voltage command value Vref input to the current command value calculator 30.
• the voltage command value Vref is input to the current command value calculator 30 only during the voltage control mode, and is set to zero during the current control mode.
• the change in the calculated current value is calculated based on the difference between the voltage command value Vref and the detected voltage value Vdet, and the current value of the calculated current value is calculated by adding the change in the calculated current value to the previous value of the calculated current. Therefore, when the voltage command value Vref becomes zero in current control mode, a calculated current value is calculated to bring the detected voltage value Vdet closer to zero, and the calculated current value for bringing the detected voltage value Vdet closer to zero is stored as the previous value. When switching from current control mode to voltage control mode, the current value of the calculated current value is calculated by adding the change in the calculated current value to the previous value of the calculated current.
• the proportional-integral controller 52 calculates the final current command value as the calculated current value.
• the final current command value corresponding to the current command value is stored as the previous value of the calculated current value.
• the proportional-integral controller 52 sets the previous value of the calculated current value as the final current command value. Therefore, in the power supply device 10 according to this embodiment, when switching from the current control mode to the voltage control mode, the current value of the calculated current value is calculated by adding the change in the calculated current value to the final current command value corresponding to the current command value.
• the output current and output voltage can be gradually changed from those corresponding to the current command value to those corresponding to the voltage command value.
• the power supply device 10 can suppress large fluctuations in the output current and output voltage even when switching from current control mode to voltage control mode.
• the present embodiment includes the following aspects.
• Appendix 1 a converter that converts power supplied from a power source into DC power corresponding to a DC load and supplies the converted DC power to the DC load; a current detector that detects the magnitude of the current of the DC power supplied from the converter to the DC load; a voltage detector that detects the magnitude of the voltage of the DC power supplied from the converter to the DC load; a control device for controlling the operation of the converter to convert power; Equipped with the control device has a current control mode for controlling the operation of the converter so as to output a current of a constant magnitude corresponding to a current command value, and a voltage control mode for controlling the operation of the converter so as to output a voltage of a constant magnitude corresponding to a voltage command value, and arbitrarily switches between the current control mode and the voltage control mode based on an input switching signal;
• the control device a current command value calculator that calculates a final current command value that indicates the magnitude of the current of the DC power supplied from the converter to the DC load, based on the
• (Appendix 2) 2. The power supply device according to claim 1, wherein the proportional-integral controller has a limiter that performs processing to limit the calculated current value to an upper limit when the calculated current value is equal to or greater than an upper limit, and processes processing to limit the calculated current value to a lower limit when the calculated current value is equal to or less than a lower limit, and when the current control mode is set, sets both the upper and lower limits of the limiter to the final current command value, thereby calculating the final current command value as the calculated current value.
• the proportional-integral controller has a limiter that performs processing to limit the calculated current value to an upper limit when the calculated current value is equal to or greater than an upper limit, and processes processing to limit the calculated current value to a lower limit when the calculated current value is equal to or less than a lower limit, and when the current control mode is set, sets both the upper and lower limits of the limiter to the final current command value, thereby calculating the final current command value as the calculated current value.

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  • 2024-06-12 JP JP2026527537A patent/JPWO2025257974A1/ja active Pending
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