JP2017195668A - Power supply - Google Patents

Abstract

Occurrence of malfunction in a device that supplies a DC output voltage when an input voltage is interrupted is prevented.
SOLUTION: Power supply units 5 and 6 for generating voltages Vcc1 and Vcc2, an interruption detection unit 7 that operates at the voltage Vcc2 and outputs a signal S1 indicating an interruption state of the voltage Vi, and operates at the voltage Vcc1 and operates at the voltage Vi. Is connected between the converter section 9 that generates each DC output voltage Vo from the output terminals 3 and 4 and outputs the voltage Vcc1 from the power supply section 5 to the converter section 9 and supplies the voltage Vcc1. A load unit 13 that executes a first operation for reducing the voltage to the ground G, and load units 14 and 15 that are connected between the output terminals 3 and 4 and execute a second operation for reducing each DC output voltage Vo to zero volts. When the voltage Vi interruption state is detected based on the signal S1, the load unit 13 executes the first operation, the load units 14 and 15 execute the second operation, and then the load units 13 to 15 are connected. And a control unit 8 to shift the load state.
[Selection] Figure 1

Description

  The present invention relates to a power supply device having a function of reducing a DC output voltage once to zero volts (or near zero volts) in a short time when an input voltage is interrupted for a specified time or more.

  As this type of power supply device, a power supply device disclosed in Patent Document 1 below is known. This power supply device converts the DC voltage input to the primary side and outputs the DC voltage (DC output voltage) from the secondary side, and the DC voltage from the secondary side output by the output means. A power supply capable of operating in a power saving mode that reduces power consumption by stopping all or part of the operation of the load operated by the DC voltage from the secondary side output from the output means, and a capacitor for stabilizing When the device is operating in the power saving mode, the detection means for detecting that the power supply from the commercial power source is cut off, the discharge load for discharging the capacitor, Control means for controlling the discharge load to operate when it is detected that the supply has been shut off. Specifically, the discharge load is a resistor connected in series with a switching element that can be switched on and off between the output of the secondary side DC voltage by the output means and the ground, and the control means When the detection means detects that the power supply is cut off, the capacitor is discharged by switching on the switching element.

  With this configuration, in this power supply device, when the power supply from the power supply is interrupted, the smoothing capacitor can be discharged quickly, so the DC voltage output from the secondary side is zero volts (or near zero volts). Therefore, even if the user performs the work of removing the optional device such as the additional memory immediately after the power is turned off, it is possible to prevent the optional device and the device main body from being destroyed. It has become.

  In addition, an electronic apparatus device that operates with a DC voltage supplied from the power supply device is supplied from the power supply device when the power supply device detects that the power supply is cut off and discharges the smoothing capacitor. Since the operating DC voltage is cut off (becomes zero volt or a voltage in the vicinity of zero volt (approximately zero volt)), the operation shifts to the stop state. After that, when power supply to the power supply device is started, since the DC voltage is supplied to the electronic device device from the power supply device that has resumed operation, the electronic device device restarts and shifts to the operating state.

JP 2012-78458 A (pages 7-8, FIGS. 5-6)

  By the way, the user side of the electronic device apparatus that operates with the DC voltage from the power supply device described above has been disconnected regardless of the power supply (input voltage) power supply to the power supply device. The power output device always has the same output start characteristics when the power supply restarts the output of the DC voltage (whether the power switch is turned off or the power supply has an abnormality such as a momentary power interruption). (For example, the voltage starts to rise while maintaining the voltage at almost zero volts for a specified time or more, or the voltage rise time after that is almost the same time.) There is a request. The reason for this is that if a change occurs in the output start characteristics of the DC voltage for each factor of the interruption of the power supply, there is a possibility that the startup sequence in the electronic device apparatus may become abnormal, which causes the electronic apparatus device to This is because malfunction or malfunction may occur.

  However, in the power supply device configured as described above, when the interruption of the power supply is detected, the direct current voltage (output from the DC / DC converter in the above-mentioned Patent Document 1 to an electronic device (such as a control unit of this device) is output. As for the voltage), the switching element is turned on as described above, and the DC voltage stabilizing capacitor disposed between the DC voltage supply lines is forcibly discharged in a short time. Although the transition to the state of almost zero volt is surely performed before the restart, for example, another DC voltage generated in the power supply device (in front of the DC / DC converter in the above-mentioned Patent Document 1) Other capacitors for stabilizing the voltage generated by the other installed DC / DC converter and serving as the operating voltage of the DC / DC converter. Not adopted a structure for forcibly discharging for.

  For this reason, depending on the factor of the interruption of the power supply (input voltage) (specifically, depending on the length of the interruption time caused by the occurrence of this factor), the other DC voltage is There is a case where a state of rising again due to resumption of power supply may occur without shifting to a substantially zero volt state before power supply is resumed. Further, in this power supply device, when the other DC voltage is in a state where it rises again without shifting to the zero volt state as described above, a voltage generated by a DC / DC converter operating with the other DC voltage is used. Also, the voltage rises in a shorter time than when another DC voltage rises to zero volts and then rises again (that is, the output start characteristic changes). Therefore, the power supply apparatus has a problem to be solved that there is a possibility of causing malfunction or malfunction in an electronic apparatus that supplies a DC voltage due to interruption of power supply.

  The present invention has been made to solve such a problem, and provides a power supply device that can prevent malfunctions and malfunctions in an electronic device that supplies a DC output voltage when an input voltage is interrupted. The main purpose is to provide.

  In order to achieve the above object, a power supply device according to the present invention includes a first auxiliary power supply unit that generates a first auxiliary voltage based on an internal reference potential based on an input voltage, and the internal reference based on the input voltage. A second auxiliary power unit that generates a second auxiliary voltage based on the potential and holds the second auxiliary voltage at a threshold voltage value or more for a predetermined holding time in the cutoff state of the input voltage; A shut-off detection unit that operates with the second auxiliary voltage and outputs a shut-off detection signal indicating whether or not the shut-off state is occurring in the input voltage; and operates with the first auxiliary voltage and 1 based on the input voltage A converter unit that generates two or more types of DC output voltages and outputs them between output terminals corresponding to the DC output voltage, and is configured to be able to shift to either a heavy load state or a light load state When Connected to the first auxiliary voltage supply line from the first auxiliary power supply unit to the converter unit, and is shifted to the heavy load state to change the voltage value of the first auxiliary voltage to the internal reference potential or A first active load unit that executes a first operation that lowers the internal reference potential to a potential close to the internal reference potential, and configured to be able to shift to either a heavy load state or a light load state and connected between the output terminals A second active load portion that performs a second operation that is shifted to the heavy load state and reduces the voltage value of the DC output voltage to zero volts or near zero volts; and the second active load portion that is equal to or greater than the threshold voltage value. When operating with two auxiliary voltages and detecting that the interruption state continues for a predetermined interruption reference time less than the holding time based on the interruption detection signal? A control unit that executes a voltage reduction process before the holding time elapses, and the control unit causes the first active load unit to execute the first operation in the voltage reduction process, and performs the second active The load unit is caused to execute the second operation, and then the first active load unit and the second active load unit are shifted to the light load state.

  Further, the power supply device according to the present invention defines the minimum value of the design output holding time for the DC output voltage in the converter unit as the output holding time minimum value, and the output holding in the specifications for the DC output voltage. When the time is defined as a length less than the minimum value of the output holding time, the cutoff reference time is defined as a length exceeding the specified output holding time and less than the minimum value of the output holding time. .

  Further, in the power supply device according to the present invention, whether the control unit is in a stopped state in which the first active load unit performs the first operation and the converter unit stops generating the DC output voltage. When the stop state is detected, the second active load unit is caused to execute the second operation.

  Further, the power supply device according to the present invention is configured such that the converter unit is controlled by the control unit to be able to shift to any one of the stop state and the operation state for generating the DC output voltage, and the control unit The unit shifts the converter unit to the stopped state when causing the second active load unit to execute the second operation.

  Further, in the power supply device according to the present invention, the first auxiliary power supply unit is controlled by the control unit and is in an operation state in which the first auxiliary voltage is generated and a stop state in which the generation of the first auxiliary voltage is stopped. The control unit is configured to be able to shift to any state, and the control unit shifts the first auxiliary power supply unit to the stopped state when causing the first active load unit to execute the first operation.

  In the power supply device of the present invention, the voltage value of the first auxiliary voltage for operating the converter unit is set to the internal reference potential or the second active load unit that executes the second operation for reducing the DC output voltage to zero volts or near zero volts. A first active load unit that executes a first operation for lowering to a potential close to the internal reference potential is provided, and from the time when it is detected that the shut-off state continues for more than the shut-off reference time, within the output holding time (tentatively the first active In the absence of the first operation of the load unit and the second operation of the second active load unit, the time during which the DC output voltage can be maintained within the rated voltage range is referred to as the output holding time in the power supply device). Causes the first active load section to perform the first operation as the voltage drop process, and sets the voltage value of the first auxiliary voltage to the internal reference potential or in the vicinity of the internal reference potential. It is lowered to position and then to execute the second operation in the second active load unit, to lower the DC output voltage to zero volts or zero volts vicinity. This voltage reduction process reduces the first auxiliary voltage to the internal reference potential or a potential close to the internal reference potential, and the DC output voltage to zero volts or near zero volts, even if the input voltage is restored during this process. It continues for a certain period of time until it is lowered. The control unit then shifts the first active load unit and the second active load unit to the light load state.

  In this case, the minimum value of the design output holding time for the DC output voltage in the converter unit is defined as the output holding time minimum value, and the output holding time in the specification for this DC output voltage is less than the output holding time minimum value. When the length is defined, the cutoff reference time is defined as a length exceeding the specified output holding time and less than the minimum output holding time.

  Therefore, according to this power supply apparatus, when the input voltage is interrupted for more than the reference interruption time, the DC output voltage is reliably reduced to zero volts or near zero volts (the input voltage is restored while the DC output voltage is decreasing). When the input voltage is reduced, the output of the DC output voltage can be started with the same output start characteristics as when the input voltage was initially turned on. As a result, when the input voltage is interrupted for a length exceeding the output holding time for the DC output voltage, in the conventional power supply device, after the DC output voltage once falls below the rated voltage value range, zero volts Or, there was a case where the halfway voltage value returned to the rated voltage value range again without dropping to near zero volts (dip), but according to this power supply device, such a situation Can be avoided. For this reason, it is possible to surely prevent the occurrence of a situation in which an electronic device or the like that operates by receiving a DC output voltage supplied from the power supply device causes malfunction or malfunction due to the occurrence of a dip.

  In addition, according to the power supply device of the present invention, a configuration is adopted in which the control unit detects the transition of the converter unit to the stop state and then causes the second active load unit to execute the second operation (transition to the heavy load state). Thus, it is possible to reliably avoid the occurrence of a situation in which the second active load unit shifts to the heavy load state before the converter unit stops outputting the DC output voltage. For this reason, in addition to the above effect, the voltage value of the DC output voltage can be reduced to zero volts in a shorter time while suppressing power consumption in the second active load section.

  Further, according to the power supply device of the present invention, when the control unit causes the second active load unit to execute the second operation (transition to the heavy load state), the converter unit is forced to perform a DC generation operation. By adopting a configuration for stopping (converting the converter unit to the stopped state), the converter unit is shifted to the stopped state even before the converter unit shifts to the stopped state due to a decrease in the voltage value of the first auxiliary voltage. As a result, it is possible to cause the second active load section to execute the second operation (shift to the heavy load state) at an earlier time point, and as a result, the voltage value of the second DC output voltage is reduced to zero volts in a shorter time. Can be made.

  According to the power supply device of the present invention, when the control unit causes the first active load unit to execute the first operation (shift to the heavy load state), the first auxiliary voltage is applied to the first auxiliary power unit. By adopting a configuration that forcibly stops the generation operation of the first auxiliary power supply unit (the first auxiliary power supply unit is shifted to the stop state), the first auxiliary power supply unit is stopped after the first auxiliary voltage generation operation is stopped. Since the first operation can be executed (shifted to the heavy load state) by one active load unit, the first auxiliary voltage can be shortened while suppressing power consumption in the first auxiliary power supply unit and the first active load unit. The internal reference potential or a potential close to the internal reference potential can be lowered over time.

1 is a configuration diagram of a power supply device 1. FIG. FIG. 6 is a waveform diagram for explaining the operation of the power supply device 1. 4 is a timing chart for explaining a blockage monitoring process 50; 4 is a timing chart for explaining a voltage drop process 60 in FIG. 3. It is a timing chart for demonstrating the other example of the voltage reduction process 60 in FIG.

  Hereinafter, embodiments of a power supply device will be described with reference to the drawings.

  As shown in FIG. 1, a power supply device 1 as an example of a power supply device includes an input terminal 2, output terminals 3 and 4, a first auxiliary power supply unit 5, a second auxiliary power supply unit 6, an interruption detection unit 7, and a control unit 8. , Converter unit 9, smoothing capacitors 10, 11, 12 and active load units 13, 14, 15 based on input voltage Vi input from input terminal 2, one or more DC output voltages (this example) Then, as an example, two types of DC output voltages Vo1, Vo2 (for example, DC5V, DC12V, etc.) are generated, and these DC output voltages Vo1, Vo2 are output to the corresponding output terminals 3, 4. The input voltage Vi may be either a DC voltage or an AC voltage. In this example, the input voltage Vi is input as an AC voltage (for example, commercial AC of AC100V and 60 Hz). For this reason, the power supply device 1 of the present example includes a rectifying / smoothing unit 16, which rectifies and smoothes the input voltage Vi as an AC voltage, converts it to a DC voltage Vdc, and supplies it to the inside of the power supply device 1. To do. Note that when the input voltage Vi is input as a DC voltage, the rectifying / smoothing unit 16 is unnecessary and is omitted. In this case, the input voltage Vi is supplied as it is to the inside of the power supply device 1 as the DC voltage Vdc.

  The first auxiliary power supply unit 5 is configured by, for example, a switching type or series type power supply, and is based on the input voltage Vi (specifically, based on the DC voltage Vdc generated from the input voltage Vi in this example). Although it may be based on a voltage induced in the auxiliary winding of the transformer in the converter unit 9 at the time of switching), the internal reference potential (the potential of the internal ground G (zero volt in the power supply device 1)) is the first. The auxiliary voltage Vcc1 is generated and output to the converter unit 9 through a pair of supply lines L1a and L1b for the first auxiliary voltage Vcc1.

  The second auxiliary power supply unit 6 is constituted by, for example, a switching type or series type power supply, and is based on the input voltage Vi (specifically, based on the DC voltage Vdc generated from the input voltage Vi in this example). ), The second auxiliary voltage Vcc2 based on the internal reference potential (the potential of the internal ground G) is generated and output to the interruption detection unit 7 and the control unit 8. Further, the second auxiliary power supply unit 6 is configured such that, when the input voltage Vi is cut off, at least the control unit 8 executes the cut-off monitoring process 50 (see FIG. 3), which will be described later, for the second auxiliary voltage Vcc2. Can be maintained at or above the threshold voltage value Vth until the voltage is reduced to zero volts or near zero volts (that is, the reduction of the DC output voltages Vo1 and Vo2 is completed). In this case, in the state where the input voltage Vi is cut off, the DC voltage Vdc is caused by the capacitor (not shown) constituting the rectifying / smoothing unit 16 or the input capacitor (not shown) provided at the input stage of the second auxiliary power supply unit 6 as described above. The second auxiliary voltage Vcc2 is held at or above the threshold voltage value Vth at least until the decrease of the DC output voltages Vo1 and Vo2 is completed. The second auxiliary voltage Vcc2 may be at least a threshold level until the decrease of the DC output voltages Vo1 and Vo2 is completed by an output capacitor (not shown) disposed in the output stage of the second auxiliary power supply unit 6. It is good also as a structure hold | maintained more than the value voltage value Vth.

  The shut-off detection unit 7 operates with the second auxiliary voltage Vcc2, and the shut-off detection signal S1 indicating whether or not the input voltage Vi is shut off (in this example, the shut-off detection signal S1 is shut off). Output signal). In this case, the interruption means that when the input voltage Vi is an AC voltage, for example, a waveform corresponding to one half cycle on either the positive side or the negative side is lost, and when the input voltage Vi is a DC voltage. When the input voltage Vi is input as the DC voltage Vdc, for example, it means that the voltage value is lowered to a threshold voltage value or less for a predetermined input voltage Vi. Therefore, when the input voltage Vi is an AC voltage, the interruption detection unit 7 starts outputting the interruption detection signal S1 when detecting that the waveform corresponding to the half cycle is lost, and then the half cycle. The interruption detection signal S1 continues to be output until the missing waveform of the minute waveform is resolved (until the waveform corresponding to one of the positive and negative half cycles is normally output). Further, when the input voltage Vi is a DC voltage, the interruption detection unit 7 starts outputting the interruption detection signal S1 when detecting that the voltage value has dropped below the threshold voltage value. The output of the interruption detection signal S1 is continued until the value exceeds the threshold voltage value.

  The control unit 8 is composed of, for example, a CPU, a DSP (Digital Signal Processor), etc., and operates at the second auxiliary voltage Vcc2 (when the second auxiliary voltage Vcc2 is equal to or higher than the threshold voltage value Vth described above). The shutdown monitoring process 50 (see FIG. 3) is executed. Specifically, in the interruption monitoring process 50, when the control unit 8 detects that the input voltage Vi is continuously interrupted for a predetermined interruption reference time tref or more based on the interruption detection signal S1, The control signal Ss1 is output to the active load unit 13 as the first active load unit, and on the other hand, the recovery of the input voltage Vi (that the input voltage Vi has been released) is detected based on the cutoff detection signal S1. The output of the control signal Ss1 is stopped. The minimum value of the time width during which the control unit 8 outputs the control signal Ss1 is defined in advance as the reset time trs1min. As a result, when the control unit 8 detects the interruption of the input voltage Vi and starts outputting the control signal Ss1, the reset time trs1min elapses even if the input voltage Vi recovers within the reset time trs1min. Until the control signal Ss1 is output until the active load unit 13 is shifted from the normal operation state (light load state) to the heavy load state (heavy load state) as described later. By maintaining the first operation, the first operation for reducing the first auxiliary voltage Vcc1 output from the first auxiliary power supply unit 5 to the converter unit 9 to the internal reference potential or a potential near the internal reference potential within the reset time trs1min is an active load. This is executed for the unit 13. Further, in the interruption monitoring process 50, the control unit 8 generates and outputs the control signals Ss2 and Ss3 with the same logic as the control signal Ss1 to the active load units 14 and 15 as the second active load units. The minimum value of the time width at which the control unit 8 outputs the control signals Ss2 and Ss3 is also defined in advance as the reset time trs2min. Thereby, when the control unit 8 detects the interruption of the input voltage Vi and starts outputting the control signals Ss2 and Ss3 once, even if the input voltage Vi is recovered within the reset time trs2min, the reset time trs2min The output of the control signals Ss2 and Ss3 is continued until the time elapses, and even when the load of the power supply device 1 is extremely light, as described later, the state is changed from the normal operation state (light load state) to a heavy load ( By maintaining the active load units 14 and 15 shifted to the heavy load state) in this heavy load state, the DC output voltages Vo1 and Vo2 output to the load from the converter unit 9 of the power supply device 1 are within the reset time trs2min. The active load sections 14 and 15 are caused to execute a second operation for reducing the voltage to zero volts or near zero volts.

  Further, the control unit 8 detects the next interruption after the activation until it is detected that the input voltage Vi is continuously interrupted for the interruption reference time tref or after the reset times trs1 and trs2 have elapsed. The output of the control signals Ss1, Ss2, and Ss3 is stopped until it is detected that the input voltage Vi is continuously cut off for the cut-off reference time tref or more based on the signal S1. Further, when the second auxiliary voltage Vcc2 becomes less than the threshold voltage value Vth and shifts to the non-operation state (stop state), the control unit 8 stops outputting the control signals Ss1, Ss2, and Ss3. It is configured.

  As shown in FIG. 1 as an example, the converter unit 9 includes one or two or more DC / DC converter circuits 21 (in this example, two DC / DC converter circuits (also simply referred to as converter circuits) 21a and 21b. When not particularly distinguished, it is also referred to as a converter circuit 21) and a switch control circuit 22 for controlling the direct current generating operation of each converter circuit 21. In this case, each converter circuit 21 may be configured as a non-insulated converter circuit that does not include an insulating transformer, or may be configured as an insulating converter circuit that includes an insulating transformer.

  The converter circuit 21a includes a switching element 23a and operates at the first auxiliary voltage Vcc1, generates a DC output voltage Vo1 based on the DC voltage Vdc, and outputs the DC output voltage Vo1 between the output terminals 3a and 3b. The converter circuit 21b includes a switching element 23b and operates with the first auxiliary voltage Vcc1, generates a DC output voltage Vo2 based on the DC voltage Vdc, and outputs it between the output terminals 4a and 4b. . The switch control circuit 22 includes, for example, a detection circuit (not shown) that detects the voltage values of the DC output voltages Vo1 and Vo2, and operates with the first auxiliary voltage Vcc1 to detect the detected DC output voltages Vo1. , Vo2 based on the voltage value of each of the switching circuits 23a, 23b based on the voltage value of each of the switching circuits 23a, 23b to control the direct current generating operation of each converter circuit 21, thereby each DC output at a specified voltage value. The voltages Vo1 and Vo2 are generated in each converter circuit 21. In addition, each converter circuit 21 and switch control circuit 22 of the converter unit 9 shifts to an operation state in which the first auxiliary voltage Vcc1 operates as described above when the voltage value of the first auxiliary voltage Vcc1 is equal to or higher than the reset voltage value Vrst, and the reset voltage value Vrst. When the value is less than the range, the above-described operation (including the direct current generation operation) is shifted to a stopped state.

  As shown in FIG. 1, the smoothing capacitor 10 is connected between the supply lines L1a and L1b of the first auxiliary voltage Vcc1 output from the first auxiliary power supply unit 5 to the converter unit 9, and the voltage of the first auxiliary voltage Vcc1. It functions as a reserve capacitor that stabilizes the value. The smoothing capacitor 11 is connected between the output terminals 3a and 3b from which the DC output voltage Vo1 is output, and functions as a reserve capacitor that stabilizes the voltage value of the DC output voltage Vo1, and the smoothing capacitor 12 It is connected between the output terminals 4a and 4b from which the voltage Vo2 is output, and functions as a reserve capacitor that stabilizes the voltage value of the DC output voltage Vo2.

  As shown in FIG. 1, the active load unit 13 includes a load 13a (specifically, a resistor 13a) and a switch 13b (a switch composed of a relay, a semiconductor switch element such as a bipolar transistor and a field effect transistor). Are connected in series and connected between the supply lines L1a and L1b of the first auxiliary voltage Vcc1 (that is, connected in parallel with the smoothing capacitor 10). The active load unit 13 supplies the first auxiliary voltage Vcc1 by controlling the on / off state of the switch 13b by the control unit 8 (specifically, the control signal Ss1 output from the control unit 8). Active load (capacitor component heavy load) when the switch 13b is in an on state for the capacitive component (including the smoothing capacitor 10) existing between the lines L1a and L1b, and normal when the switch 13b is in an off state. It functions as a load state of operation (a load that is a very light load (light load state) with respect to the capacity component). With this configuration, the active load unit 13 is shifted to the heavy load state when the switch 13b is controlled to be in the ON state by the control unit 8, and the capacitance existing between the supply lines L1a and L1b of the first auxiliary voltage Vcc1. It is possible to execute the first operation in which the charge charged to the component is rapidly discharged by the resistor 13a to reduce the voltage value of the first auxiliary voltage Vcc1 to the internal reference potential or a potential close to the internal reference potential in a short time. On the other hand, when the control unit 8 controls the switch 13b to be in the OFF state, it is shifted to the normal operation load state (light load state) (stopping the execution of the first operation), and the first auxiliary voltage Vcc1. Enables charging of this capacitive component.

  The active load unit 14 is connected to a state where no output load (an external load receiving the supply of the DC output voltage Vo1) is connected between the output terminals 3a and 3b (no load state) or a very light output load (not shown). 1, as shown in FIG. 1, similarly to the active load unit 13, the load 14 a (specifically, the resistor 14 a) and the switch 14 b are configured as an active load connected in series. It is connected between the output terminals 3a and 3b (that is, connected in parallel with the smoothing capacitor 11). The active load unit 14 is also shifted to a heavy load state when the switch 14b is controlled to be in the ON state by the control unit 8, and the capacitance component (including the smoothing capacitor 11) existing between the output terminals 3a and 3b is changed. It is possible to execute the second operation in which the charged electric charge is rapidly discharged by the resistor 14a and the voltage value of the DC output voltage Vo1 is reduced to zero volts or near zero volts in a short time. When 14b is controlled to be in the OFF state, it is shifted to a light load state (the execution of the second operation is stopped), and charging of this capacitance component by the DC output voltage Vo1 is enabled.

  The active load unit 15 is connected to an output load (external load receiving the supply of the DC output voltage Vo2) between the output terminals 4a and 4b (no load state) or an extremely light output load (not shown). 1, the active load unit 13 is configured as an active load in which a load 15a (specifically a resistor 15a) and a switch 15b are connected in series as shown in FIG. It is connected between the output terminals 4a and 4b (that is, connected in parallel with the smoothing capacitor 12). This active load unit 15 is also shifted to the heavy load state when the switch 15b is controlled to be in the ON state by the control unit 8, and the capacitance component (including the smoothing capacitor 12) existing between the output terminals 4a and 4b is changed. It is possible to execute the second operation in which the charged electric charge is rapidly discharged by the resistor 15a and the voltage value of the DC output voltage Vo2 is reduced to zero volts or near zero volts in a short time. When 15b is controlled to be in the OFF state, it is shifted to a light load state (execution of the second operation is stopped), and this capacity component can be charged by the DC output voltage Vo2.

  Next, the operation of the power supply device 1 will be described with reference to FIGS. The input terminal 2 is connected to a supply line (not shown) of the input voltage Vi, and the output terminals 3 and 4 are provided with electronic device devices and electronic circuits that operate upon receiving the supply of the DC output voltages Vo1 and Vo2. Assume that it is connected as an output load.

  First, as shown in FIG. 2, an input is turned on by operating a power switch (not shown) provided in the supply line of the input voltage Vi (supply of the input voltage Vi to the input terminal 2 is started). In the power supply device 1, since the rectifying / smoothing unit 16 rectifies and smoothes the input voltage Vi to convert it to the DC voltage Vdc and starts outputting it, the first auxiliary power unit 5 and the second auxiliary power unit 6 and converter unit 9 are supplied with DC voltage Vdc.

  As a result, the second auxiliary power supply unit 6 starts generating the second auxiliary voltage Vcc2 based on the DC voltage Vdc and outputting it to the interruption detection unit 7 and the control unit 8. As a result, the interruption detection unit 7 starts detecting whether or not an interruption state has occurred in the input voltage Vi. The first auxiliary power supply unit 5 starts generating the first auxiliary voltage Vcc1 based on the DC voltage Vdc and outputting it to the converter unit 9. At the time of input, since the input voltage Vi is not interrupted, the interrupt detector 7 has not started outputting the interrupt detection signal S1. Further, as shown in FIG. 2, the shutoff detection unit 7 detects the shutoff of the input voltage Vi immediately after the start of the shutoff period for the shutoff periods T1 and T2 until the input voltage Vi is shut off and then recovered. From time until time, the interruption detection signal S1 is output until the recovery of the input voltage Vi is detected immediately after the end of the interruption period.

  Further, since the second auxiliary voltage Vcc2 rises from zero volts and then the voltage value becomes equal to or higher than the threshold voltage value Vth, the control unit 8 shifts from the non-operating state to the operating state and performs the interruption shown in FIG. The monitoring process 50 is started. Note that when the input voltage Vi is turned on, the interruption detection signal S1 is not output from the interruption detection unit 7 as described above. For this reason, the control unit 8 does not output the control signals Ss1, Ss2, and Ss3.

  In addition, since the control signal Ss1 is not output in this way, the active load unit 13 is in a light load state, so that the first auxiliary voltage Vcc1 output from the first auxiliary power supply unit 5 is used between the supply lines L1a and L1b. The first auxiliary voltage Vcc1 rises from zero volts in the same manner as the second auxiliary voltage Vcc2 by charging the capacitance component (including the smoothing capacitor 10). When the voltage value of the first auxiliary voltage Vcc1 exceeds the reset voltage value Vrst for the converter unit 9, in the converter unit 9, each converter circuit 21 and the switch control circuit 22 start a direct current generating operation. In this state, since the control unit 8 does not output the control signals Ss2 and Ss3 to the active load units 14 and 15, the active load units 14 and 15 are in a light load state. As a result, the DC output voltage Vo1 output between the converter circuit 21a and the output terminals 3a and 3b, and the DC output voltage Vo2 output between the converter circuit 21b and the output terminals 4a and 4b, correspond to the corresponding smoothing capacitors 11 and 21. The voltage rises from zero volts while charging, and thereafter is maintained at a specified voltage value by the converter circuits 21a and 21b. Therefore, each DC output voltage Vo1, Vo2 is supplied as a constant voltage to an output load such as an electronic device or an electronic circuit connected to each output terminal 3, 4.

  As shown in FIG. 3, the control unit 8 first detects the presence or absence of the output of the block detection signal S <b> 1 from the block detection unit 7 (that is, the input voltage Vi via the block detection unit 7). While monitoring the state (step 51), when the start of output of the shutoff detection signal S1 is detected (when the start of shutoff of the input voltage Vi is detected), this detection timing of the shutoff detection signal S1 is set to time zero. Measurement of time t1 is started (step 52).

  Next, the control unit 8 determines whether or not the measured cutoff time t1 has reached a predetermined cutoff reference time tref (step 53), and in this process, the cutoff time t1 is the cutoff reference time. When it is determined that tref has not been reached, the process of detecting whether or not the output of the cutoff detection signal S1 has stopped (that is, whether or not the input voltage Vi has been restored) is repeatedly executed (step 54). .

  In this state, as in the cutoff period T1 shown in FIG. 2, before the measured cutoff time t1 reaches the cutoff reference time tref (before the output time of the cutoff detection signal S1 reaches the cutoff reference time tref). When the input voltage Vi is restored (when the interruption period T1 ends), the control unit 8 detects the stop of the output of the interruption detection signal S1 in step 54 and stops measuring the interruption time t1. At the same time, the measured interruption time t1 is reset (step 55), the process returns to step 51, and the interruption monitoring process 50 is restarted.

  In this power supply device 1, for this cutoff reference time tref, for example, as shown in FIG. 2, it exceeds the output hold time Tohs in the specifications for each DC output voltage Vo1, Vo2 of the power supply device 1, and the designed output The length is defined to be shorter than the minimum holding time value Tohdmin (that is, the time when the relationship of output holding time Tohs <cutoff reference time tref <output holding time minimum value Tohdmin is satisfied). Note that the output holding time for each of the DC output voltages Vo1 and Vo2 means that even if the input voltage Vi is cut off, the converter unit 9 is able to operate if the cut-off time (cut-off time) is equal to or shorter than the output holding time. This is the time during which the voltage values of the DC output voltages Vo1 and Vo2 can be maintained at the rated output voltage values. The designed output holding time minimum value Tohdmin is a worst-case design value for the output holding time calculated in consideration of variations of components used in the power supply device 1. The specified output holding time Tohs is a time that is less than the output holding time minimum value Tohdmin and that has a certain margin with the output holding time minimum value Tohdmin. Stipulated in Therefore, when the control unit 8 detects the stop of the output of the cutoff detection signal S1 before the measured cutoff time t1 reaches the cutoff reference time tref, the control unit 8 stops and measures the cutoff time t1. By resetting the value of the shut-off time t1 and restarting the shut-off monitoring process 50 (that is, restarting the shut-off monitoring process 50 without executing the voltage drop process 60 described later), the power supply device 1 has the converter unit. 9 is a state in which the voltage values of the DC output voltages Vo1 and Vo2 can be maintained at the rated output voltage values (that is, when the cutoff time t1 of the input voltage Vi is equal to or shorter than the output holding time Tohs in the specification). 14 and 15 prevent the voltage values of the DC output voltages Vo1 and Vo2 from being lowered below the rated output voltage value.

  On the other hand, when the input voltage Vi is cut off longer than the cut-off reference time tref as in the cut-off period T2 shown in FIG. 2, the control unit 8 detects the stop of the output of the cut-off detection signal S1 in step 54. Further, it is detected in step 53 that the measured interruption time t1 has reached the interruption reference time tref (the output time of the interruption detection signal S1 has reached the interruption reference time tref), as shown in FIG. Then, the voltage drop process 60 is executed, and the process returns to step 51 to restart the interruption monitoring process 50. In the voltage drop process 60, as shown in FIG. 4, the control unit 8 first starts outputting the control signal Ss1 to the active load unit 13 (step 61). As a result, the active load unit 13 is shifted from the light load state to the heavy load state by the switch 13b being turned on, and the capacitance component (smoothing capacitor 10) existing between the supply lines of the first auxiliary voltage Vcc1. 2 is rapidly discharged by the resistor 13a, and the voltage value of the first auxiliary voltage Vcc1 is lowered to the internal reference potential or a potential close to the internal reference potential in a short time as shown in FIG. The first operation is executed. Further, as shown in FIG. 2, when the voltage value of the first auxiliary voltage Vcc1 becomes equal to or lower than the reset voltage value Vrst in the process of decreasing, the converter unit 9 stops the direct current generation operation.

  The control unit 8 starts outputting the control signals Ss2 and Ss3 to the active load units 14 and 15 after the direct current generating operation in the converter unit 9 is stopped (step 62). As a result, each of the active load units 14 and 15 is shifted from the light load state to the heavy load state by the transition of the corresponding switches 14b and 15b to the on state, and exists between the corresponding output terminals 3a and 3b. The charge charged in the capacitive component (including the smoothing capacitor 11) is rapidly discharged by the resistor 14a, and the capacitive component (including the smoothing capacitor 12) existing between the corresponding output terminals 4a and 4b is charged. The second electric charge is quickly discharged by the resistor 15a and the voltage values of the DC output voltages Vo1 and Vo2 are reduced to zero volts or near zero volts in a short time as shown in FIG.

  In the power supply device 1 of this example, after stopping the direct current generation operation in the converter unit 9 in this way, the active load units 14 and 15 are shifted to the heavy load state and the second operation is performed. , While suppressing power consumption in each of the active load units 14 and 15 (more than power consumption when the active load units 14 and 15 are shifted to a heavy load state before stopping the DC generation operation in the converter unit 9) While suppressing power consumption), the voltage values of the DC output voltages Vo1 and Vo2 are reduced to zero volts or near zero volts in a shorter time.

  In order to configure the control unit 8 so that the control signals Ss2 and Ss3 can be output to the active load units 14 and 15 after the direct current generating operation in the converter unit 9 is stopped, The time required for the voltage value of the first auxiliary voltage Vcc1 to decrease to the reset voltage value Vrst from the start of output of the control signal Ss1 is calculated in advance through experiments and simulations, and control is performed at least for this time from the output of the control signal Ss1. A configuration in which the output of the signals Ss2 and Ss3 is delayed can be employed. As another configuration, as shown in FIG. 5, after the control unit 8 starts outputting the control signal Ss1 to the active load unit 13 (after execution of step 61), the active load unit 14 , 15 before the start of the output of the control signals Ss2, Ss3 to the output of each DC output voltage Vo1, Vo2 from the converter unit 9 (the converter unit 9 has shifted to the stop state) directly A configuration for executing the processing to detect (step 71) and starting the output of the control signals Ss2 and Ss3 to the active load portions 14 and 15 after confirming the stop of the converter unit 9 (step 62) Can also be adopted. In this case, as a method in which the control unit 8 directly detects that the converter unit 9 has shifted to the stopped state, the control unit 8 monitors the voltage value of the first auxiliary voltage Vcc1 and becomes equal to or lower than the reset voltage value Vrst. It is possible to employ a technique for detecting this and a technique for detecting that the output of the drive signals Sda and Sdb from the switch control circuit 22 has stopped.

  The control unit 8 performs control at the time of outputting only a reset time trs1 (a time longer than a first reset minimum time trs1min described later) in any of the voltage drop processing 60 shown in FIG. 4 and the voltage drop processing 60 shown in FIG. The output of the signal Ss1 is stopped, and the output of the control signals Ss2 and Ss3 is stopped when the reset time trs2 (a time longer than a second reset minimum time trs2min described later) is output (step 63). As shown in FIG. 2, the active load unit 13 is shifted to the heavy load state only for the reset time trs1, and the active load units 14 and 15 are shifted to the heavy load state for the reset time trs2 to complete the voltage reduction process 60. Here, as shown in FIG. 2, the first reset minimum time trs1min means that the active load unit 13 executes the first operation and sets the voltage value of the first auxiliary voltage Vcc1 to the internal reference potential or the vicinity of the internal reference potential. The minimum time required to reduce the potential to the potential means the second reset minimum time trs2min. The active load units 14 and 15 execute the second operation, and the voltages of the DC output voltages Vo1 and Vo2 respectively. It means the minimum time required to reduce the value to or near zero volts. In this example, the control unit 8 outputs the control signals Ss2 and Ss3 with a slight delay from the output of the control signal Ss1, thereby slightly changing the active load unit 13 from shifting to the heavy load state as shown in FIG. The delay causes the active load units 14 and 15 to shift to the heavy load state, and is the same as the power recovery timing of the next input voltage Vi that arrives after both the first reset minimum time trs1min and the second reset minimum time trs2min have elapsed. By stopping the output of the control signals Ss1, Ss2, and Ss3 at the timing, the active load units 13, 14, and 15 are shifted from the heavy load state to the light load state at the same timing as shown in FIG. The timing at which the output of each control signal Ss1, Ss2, Ss3 is stopped (that is, the timing at which each active load unit 13, 14, 15 is shifted to the light load state) is the above example (the input voltage Vi is restored next). Is not limited to the timing at which the electric power is supplied), and when a predetermined time has elapsed from the later of the first reset minimum time trs1min and the second reset minimum time trs2min. You can also When this configuration is adopted, the control unit 8 recovers the input voltage Vi while the voltage reduction process 60 is being executed (before both the first reset minimum time trs1min and the second reset minimum time trs2min have elapsed). Even when the voltage drop process 60 is completed, the active load unit 13 is shifted to the heavy load state to reduce the voltage value of the first auxiliary voltage Vcc1 to the internal reference potential or a potential close to the internal reference potential. The active load units 14 and 15 are shifted to the heavy load state, and the voltage values of the DC output voltages Vo1 and Vo2 are reduced to zero volts or near zero volts, and then the active load units 13, 14, and 15 are set to the light load state. Be sure to execute the process to be migrated).

  Note that, for the second auxiliary power supply unit 6, the holding time th for the second auxiliary voltage Vcc2 (the time during which the voltage value of the second auxiliary voltage Vcc2 can be held above the threshold voltage value Vth when the input voltage Vi is cut off) 2 is configured to be longer than the time obtained by adding the reset time trs1 to the cutoff reference time tref, as shown in FIG. Therefore, the control unit 8 operates by receiving the supply of the second auxiliary voltage Vcc2 until the voltage values of the DC output voltages Vo1 and Vo2 are reduced to zero volts or near zero volts, and reliably executes the voltage reduction process 60. It is possible.

  In the power supply device 1, when the control unit 8 detects, via the cutoff detection unit 7, that a cutoff longer than the cutoff reference time tref has occurred in the input voltage Vi as in the cutoff period T 2 described above, The control unit 8 executes the voltage reduction process 60 to shift the active load unit 13 to the heavy load state with respect to the first auxiliary voltage Vcc1 for operating the converter unit 9, thereby causing the internal reference potential (the potential of the internal ground G). ) Or lowered to a potential close to the internal reference potential (the active load unit 13 performs the first operation), and the active load units 14 and 15 are shifted to the heavy load state, and the voltage values of the DC output voltages Vo1 and Vo2 are set. Is reduced to zero volts or near zero volts (the active loads 14 and 15 perform the second operation). For this reason, as shown in FIG. 2, when the shut-off period T2 ends and the input voltage Vi recovers, the first auxiliary voltage Vcc1 starts from the time when the input voltage Vi recovers. Since it rises from the internal reference potential or a potential in the vicinity of the internal reference potential in the same manner as when it is turned on, the converter unit 9 that operates upon receiving the supply of the first auxiliary voltage Vcc1 also operates in the same way as when the input voltage Vi is initially turned on. As a result, the DC output voltages Vo1 and Vo2 generated in the converter section 9 also rise from zero volts or near zero volts at the same timing as when the input voltage Vi is initially turned on, starting from when the input voltage Vi is restored.

  Further, in the power supply device 1, although not shown, as described above, the control unit 8 starts executing the voltage reduction process 60 and before completing the voltage reduction process 60 (that is, the first reset minimum). Even when the input voltage Vi is restored (before both the time trs1min and the second reset minimum time trs2min elapse), the voltage drop processing 60 is executed to the end, and the first auxiliary voltage Vcc1 is set to the internal reference potential (internal ground potential). G potential) or a potential close to the internal reference potential, and the voltage values of the DC output voltages Vo1 and Vo2 are also reduced to zero volts or near zero volts. Therefore, in this case, the first auxiliary voltage Vcc1 is set at the time when the control unit 8 stops outputting the control signals Ss1, Ss2, and Ss3 at the end of the voltage reduction process 60 (that is, the active load units 13 and 14). , 15 starts from the internal reference potential or a potential close to the internal reference potential in the same manner as when the input voltage Vi is initially applied. Further, the converter unit 9 that operates upon receiving the supply of the first auxiliary voltage Vcc1 operates in the same manner as when the input voltage Vi is initially turned on with reference to the time when the output of the control signals Ss1, Ss2, and Ss3 is stopped. Therefore, the DC output voltages Vo1 and Vo2 generated in the converter section 9 also start from zero volts or near zero volts at the same timing as when the input voltage Vi is initially turned on, starting from this point.

  Thus, in this power supply device 1, the control unit 8 detects that the interruption detection signal S1 is continuously output for the interruption reference time tref or more (that the input voltage Vi is interrupted for the interruption reference time tref or more). The active load unit 13 is shifted from the light load state to the heavy load state (the active load unit 13 performs the first operation), and the active load units 14 and 15 are shifted from the light load state to the heavy load state, respectively. Specifically, by causing the active loads 14 and 15 to execute the second operation, specifically, the active load 13 is caused to execute the first operation, and the first auxiliary voltage Vcc1 is set to the internal reference potential or the internal reference potential. Each DC output voltage is caused by causing the active load units 14 and 15 to execute the second operation after decreasing to a near potential (lower than the reset voltage value Vrst). o1, Vo2 lowers until zero volts or zero volts vicinity, then shifts the active load portions 13, 14 and 15 in the light load state. In the power supply device 1, the cutoff reference time tref is defined to be longer than the specified output holding time Tohs and shorter than the output holding time minimum value Tohdmin.

  Therefore, according to this power supply device 1, when the input voltage Vi is interrupted for a length exceeding the output holding time Tohs specified in the specifications for the DC output voltages Vo1 and Vo2, the DC output voltages Vo1 and Vo2 are once reliably obtained. When the input voltage Vi is subsequently restored, the DC output voltages Vo1, Vo2 from zero volts or near zero volts at the same timing (same output start characteristics) as when the input voltage Vi is initially turned on. Output can be started. As a result, when the input voltage Vi is interrupted for a length exceeding the specified output holding time Tohs for the DC output voltages Vo1 and Vo2, in the conventional power supply device, the DC output voltages Vo1 and Vo2 are the rated voltage values. After the state once falls below the range, a situation in which the halfway voltage value returns to the rated voltage value range again without decreasing to zero volts or near zero volts (dip. As shown by the broken line in FIG. 2, the voltage is temporarily However, according to the power supply device 1, since the occurrence of such a situation can be avoided, the DC output voltage Vo1, connected to the power supply device 1 can be avoided. An electronic device that operates with the supply of Vo2 reliably prevents the occurrence of a malfunction or malfunction due to the occurrence of a dip. Door can be.

  Further, in this power supply device 1, as shown in FIG. 5, after the control signal Ss <b> 1 is output to the active load unit 13 in the voltage drop process 60 (after the active load unit 13 starts executing the first operation). In addition, while detecting whether or not the converter unit 9 has shifted from the operating state to the stopped state (step 71), after detecting (confirming) that the converter unit 9 has shifted to the stopped state (stop of the converter unit 9) By adopting a configuration in which the control signals Ss2 and Ss3 are output to the active load units 14 and 15 (the active load units 14 and 15 execute the second operation), the converter unit 9 outputs the DC output voltages Vo1 and Vo2. Since it is possible to reliably avoid the occurrence of a situation in which each active load unit 14 and 15 shifts to a heavy load state before stopping, in addition to the above effect, While suppressing the power consumption in the active load units 14 and 15, can be reduced to zero volts the voltage value of the DC output voltage Vo1, Vo2 shorter time.

  In the power supply device 1 described above, the control unit 8 outputs the control signal Ss1 to the active load unit 13 to execute the first operation in the voltage drop process 60, and the first auxiliary voltage Vcc1 is set to the internal reference potential or The direct-current generation operation by the converter unit 9 is stopped by lowering to a potential close to the internal reference potential (lower than the reset voltage value Vrst of the converter unit 9). For example, the converter unit 9 (specifically, The control unit 8 has a configuration in which the switch control circuit 22) can control the start and stop of the direct current generation operation by an external control signal (can be arbitrarily shifted to either the stop state or the operation state). However, when the control signals Ss2 and Ss3 are output to the active load units 14 and 15 to shift to the heavy load state (the second operation is executed), the control is performed. Forcibly stop the DC generating operation to over data unit 9 can also be adopted a configuration for outputting a control signal (migrated to the stopped state). By adopting this configuration, before the first auxiliary voltage Vcc1 falls below the reset voltage value Vrst of the converter unit 9 (the converter unit 9 shifts to the stop state due to the drop of the first auxiliary voltage Vcc1). Even in the stage, the converter unit 9 can be forcibly stopped (shifted to the stopped state), so that each of the active load units 14 and 15 can be shifted to the heavy load state at an earlier time point. As a result, the voltage values of the DC output voltages Vo1 and Vo2 can be reduced to zero volts in a shorter time.

  Further, in the power supply device 1 described above, the control unit 8 does not execute any control for the first auxiliary power supply unit 5 in the voltage reduction process 60. For example, the first auxiliary power supply unit 5 performs control from the outside. A configuration capable of arbitrarily shifting to either an operation state in which the first auxiliary voltage Vcc1 is generated by a signal or a stop state in which the generation of the first auxiliary voltage Vcc1 is stopped (starting and stopping of the generation of the first auxiliary voltage Vcc1 As a configuration that can be controlled from the outside, when the control unit 8 outputs the control signal Ss1 to the active load unit 13 to shift to the heavy load state, the first auxiliary voltage Vcc1 is supplied to the first auxiliary power supply unit 5. It is also possible to employ a configuration in which a control signal for forcibly stopping the generation operation (shifting to a stop state) is output. By adopting this configuration, it is possible to shift the active load unit 13 to the heavy load state after stopping the operation of generating the first auxiliary voltage Vcc1 with respect to the first auxiliary power unit 5, and thus the first auxiliary power source The first auxiliary voltage Vcc1 can be lowered to the internal reference potential or a potential close to the internal reference potential in a shorter time while suppressing power consumption in the unit 5 and the active load unit 13.

  Further, in the power supply device 1 described above, the converter unit 9 includes two active load units 14 and 15 for the DC output voltages Vo1 and Vo2 because the converter unit 9 generates and outputs two types of DC output voltages Vo1 and Vo2. Although the configuration is adopted, when the converter unit 9 is configured to generate and output one type of DC output voltage, the converter unit 9 includes one active load unit for the DC output voltage. In the case of a configuration that generates and outputs more than one type of DC output voltage, the same number of active load units as the types of DC output voltages are provided.

  Further, in the power supply device 1 described above, the active load units 14 and 15 are configured to execute the second operation (shift to the heavy load state) for the same reset time trs2, but for example, the output terminals 3a and 3b The capacitance value of the capacitance component (including the smoothing capacitor 11) existing between them and the capacitance value of the capacitance component (including the smoothing capacitor 12) existing between the output terminals 4a and 4b are greatly different. When there is a difference in the time required for the voltage values of the DC output voltages Vo1 and Vo2 to drop to zero volts or near zero volts after the active loads 14 and 15 start executing the second operation, the active load 14 , 15 of the active load part connected between the output terminals where the capacitance component having a large capacitance value exists is the difference of this difference than other active load parts The second operation can be started early (with different reset times trs2), and the voltage values of the DC output voltages Vo1 and Vo2 can be reduced to zero volts or near zero volts at the same timing. When the voltage values of the voltages Vo1 and Vo2 are different, the discharge speeds of the active load units 14 and 15 can be adjusted by changing the constants of the resistors 14a and 15a.

1 Power supply
5 First auxiliary power supply
6 Second auxiliary power supply
7 Blocking detector
8 Control unit
9 Converter part 13, 14, 15 Active load part
G internal reference potential Vcc1 first auxiliary voltage Vcc2 second auxiliary voltage Vi input voltage Vo1, Vo2 DC output voltage

Claims (5)

A first auxiliary power unit that generates a first auxiliary voltage based on an internal reference potential based on an input voltage;
Based on the input voltage, a second auxiliary voltage is generated with the internal reference potential as a reference, and the second auxiliary voltage is held above the threshold voltage value for a predetermined holding time when the input voltage is cut off. A second auxiliary power supply unit,
An interruption detection unit that operates with the second auxiliary voltage and outputs an interruption detection signal indicating whether or not the interruption state occurs in the input voltage;
A converter unit that operates with the first auxiliary voltage and generates one or more types of DC output voltages based on the input voltage, and outputs between the output terminals corresponding to the DC output voltage;
The heavy load is configured to be capable of transitioning to either a heavy load state or a light load state and is connected between the first auxiliary voltage supply line from the first auxiliary power supply unit to the converter unit. A first active load portion that performs a first operation that is shifted to a state and reduces the voltage value of the first auxiliary voltage to the internal reference potential or a potential near the internal reference potential;
It is configured to be able to shift to either a heavy load state or a light load state and is connected between the output terminals, and is shifted to the heavy load state so that the voltage value of the DC output voltage is zero volts or zero volts. A second active load portion that performs a second action to reduce to the vicinity;
Operating with the second auxiliary voltage equal to or higher than the threshold voltage value, it is detected based on the cutoff detection signal that the cutoff state continues for a predetermined cutoff reference time less than the holding time. A control unit that executes a voltage drop process before the lapse of the holding time, and the control unit causes the first active load part to execute the first operation in the voltage drop process, and A power supply device that causes the second active load unit to execute the second operation and then causes the first active load unit and the second active load unit to shift to the light load state.   The minimum value of the design output holding time for the DC output voltage in the converter unit is defined as the output holding time minimum value, and the output holding time in the specification for the DC output voltage is less than the output holding time minimum value. 2. The power supply device according to claim 1, wherein when the length is defined, the cutoff reference time is defined as a length that exceeds an output holding time in the specification and is less than a minimum value of the output holding time.   The control unit causes the first active load unit to execute the first operation and detects whether the converter unit is in a stopped state in which the generation of the DC output voltage is stopped, and detects the stopped state. 3. The power supply device according to claim 1, wherein the second active load unit sometimes performs the second operation. 4. The converter unit is controlled by the control unit, and is configured to be able to shift to any one of the stopped state and the operating state for generating the DC output voltage,
4. The power supply device according to claim 1, wherein the control unit shifts the converter unit to the stopped state when the second active load unit performs the second operation. 5. The first auxiliary power supply unit is configured to be controlled by the control unit so as to be able to shift to either an operation state in which the first auxiliary voltage is generated or a stop state in which the generation of the first auxiliary voltage is stopped. ,
5. The power supply device according to claim 1, wherein the control unit shifts the first auxiliary power supply unit to the stopped state when the first active load unit performs the first operation. 6.

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