JP2017060339A - Electronic apparatus and power supply control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus and power supply control method, capable of further improving power consumption efficiency.SOLUTION: The electronic apparatus includes: a power supply unit; a function operation section for performing operations relating to predetermined functions; a supply control unit for stopping power supply from the power supply unit within such a period for which an operation current of the function operation unit is less than a predetermined reference value.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic device and a power supply control method for the electronic device.

  In recent years, power saving in electronic devices has progressed, and power consumption due to functional operations has been greatly reduced. As one of such techniques, there is a technique in which a functional operation unit that performs a functional operation is intermittently operated according to a required operation amount and power is supplied only during operation. Patent Document 1 includes a switching element, a capacitor, and a feedback circuit for switching presence / absence of power supply to a plurality of functional operation units, respectively, by opening and closing each switching element while feeding back voltage fluctuation of the capacitor, A technology for supplying power corresponding to the power consumption of each functional operation unit to each capacitor is disclosed.

Special table 2013-546296 gazette

  However, in electronic devices, as the power consumption of the functional operation unit is reduced, there is a problem that the proportion of the power consumed by the internal load in the power supply unit becomes relatively large. That is, when the output current of the power supply unit is small, the ratio of the power consumed inside the power supply unit to obtain the output current increases, and there is a problem that the power consumption efficiency does not increase after all.

  An object of the present invention is to provide an electronic device and a power supply control method for the electronic device that can further improve the power consumption efficiency.

In order to achieve the above object, the present invention provides:
A power supply unit;
A function operation unit for performing an operation related to a predetermined function;
A supply control unit for stopping power supply from the power supply unit during a period when the operating current of the functional operation unit is less than a predetermined reference value;
It is an electronic device characterized by including.

  According to the present invention, there is an effect that the power consumption efficiency in the electronic device can be further improved.

It is the schematic which shows the circuit structure of the electronic device of 1st Embodiment. It is a figure which illustrates the operation timing of the operation | movement part in the electronic device of 1st Embodiment, the operation timing of the DC / DC converter according to these, and the operation timing of each switch. It is a figure which shows the example of the operating efficiency characteristic of a DC / DC converter. It is a figure which shows the example of load operation setting information. It is a figure which shows the other example of the operation timing of the operation part in the electronic device of 1st Embodiment, and the operation timing of the DC / DC converter according to these. It is a flowchart which shows the control procedure of the electric power supply control process performed in the electronic device of 1st Embodiment. It is the schematic which shows the circuit structure of the electronic device of 2nd Embodiment. It is the schematic which shows the circuit structure of the electronic device of 3rd Embodiment. It is a flowchart which shows the control procedure of the electric power supply control process performed with the electronic device of 3rd Embodiment. It is the schematic which shows the circuit structure of the electronic device of 4th Embodiment. It is a figure which illustrates the operation timing of the operation part in the electronic device of 4th Embodiment, the operation timing of the DC / DC converter according to these, and the operation timing of each switch. It is a flowchart which shows the control procedure of the operation | movement setting process performed in the electronic device of 4th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic diagram showing a circuit configuration of an electronic device 1 which is a first embodiment of the electronic device of the present invention.
The electronic device 1 of the present embodiment includes a power supply unit 20, a DC / DC converter 10 (power supply unit), an eleventh switch SW11, a twenty-first switch SW21, a first capacitor C1, and a twelfth switch SW12. 22nd switch SW22, 2nd capacitor C2, 13th switch SW13, 23rd switch SW23, 3rd capacitor C3, 14th switch SW14, 24th switch SW24, 4th capacitor C4, 1 operation | movement part 41, the 2nd operation | movement part 42, the 3rd operation | movement part 43, and the microcomputer 44 (a supply control part, a monitoring part) etc. are provided.

  The power supply unit 20 supplies power related to the operation of the electronic device 1. The power supply unit 20 is a power generation unit such as a secondary battery, a dry battery, or a solar panel, or a combination thereof. Alternatively, the configuration may be such that power acquired from an external power supply via a power cable is input instead of the power supply unit 20. In this case, the input voltage may be a smoothed direct current obtained from an AC voltage such as 100 V obtained from a commercial power source.

  The DC / DC converter 10 describes the input DC voltage (power) as an internal first operation unit 41, second operation unit 42, and third operation unit 43 (hereinafter collectively referred to as operation units 41 to 43, etc.); The function operation unit) and the operation voltage of the microcomputer 44 are converted and output. The DC / DC converter 10 is a well-known one that is normally used, and is, for example, a switching regulator that uses PWM (Pulse Width Modulation) control or PFM control (Pulse Frequency Modulation).

The operation units 41 to 43 each perform a specific function operation. Functional operations include, for example, sensors that measure physical quantities such as temperature, azimuth (geomagnetic field), and atmospheric pressure, communication units that communicate with external electronic communication devices, drive units related to motor operations, various notification operations such as LED lights, Examples thereof include an operation unit used for display operation and the like, and a CPU (Central Processing Unit). In these configurations, the operation period is defined periodically.
Here, the operation unit 41 is a control unit (operation setting unit) including a CPU, and performs various arithmetic processes. When the control unit includes a RAM, the CPU performs a predetermined operation for saving the contents stored in the RAM and the cache to the nonvolatile memory during a period when the power supply is cut off. The non-volatile memory in this case is not particularly limited, but a low operating voltage is preferable, and examples thereof include FeRAM and MRAM. Further, the control unit performs settings related to the operation of the microcomputer 44.

  The microcomputer 44 performs switch control related to power supply to the operation units 41 to 43 and the microcomputer 44 itself, that is, control operation of power supply operation of the DC / DC converter 10 and charge / discharge operation of the capacitors C1 to C4. At this time, the microcomputer 44 may control the operation of the DC / DC converter 10 at the same time. The microcomputer 44 includes an oscillation circuit 441, load operation setting information 442, and a CPU 444.

The oscillation circuit 441 generates and outputs a clock signal having a predetermined frequency.
The load operation setting information 442 is information relating to the operation timings of the operation units 41 to 43 and the microcomputer 44 that are set in advance by the operation unit 41 (control unit) and the current consumption during the operation. Stored in the memory.
The CPU 444 controls the operation of the microcomputer 44.

  One end of the first capacitor C1 is connected between the eleventh switch SW11 and the twenty-first switch SW21, and the other end is grounded to temporarily store the power supplied from the DC / DC converter 10. Accordingly, the first operating unit 41 is supplied to the first operating unit 41 during operation. The eleventh switch SW11 switches whether power can be supplied from the DC / DC converter 10 to the first capacitor C1. The twenty-first switch SW21 switches whether power can be supplied from the first capacitor C1 to the first operating unit 41.

  One end of the second capacitor C2 is connected between the twelfth switch SW12 and the twenty-second switch SW22, and the other end is grounded, and temporarily stores the power supplied from the DC / DC converter 10, so that it is necessary. Accordingly, the second operating unit 42 is supplied to the second operating unit 42 when operating. The twelfth switch SW12 switches whether power can be supplied from the DC / DC converter 10 to the second capacitor C2. The twenty-second switch SW22 switches whether power can be supplied from the second capacitor C2 to the second operating unit 42.

  One end of the third capacitor C3 is connected between the thirteenth switch SW13 and the twenty-third switch SW23, and the other end is grounded to temporarily store the power supplied from the DC / DC converter 10. Accordingly, the third operating unit 43 is supplied to the third operating unit 43 when operating. The thirteenth switch SW13 switches whether to supply power from the DC / DC converter 10 to the third capacitor C3. In addition, the 23rd switch SW23 switches whether power can be supplied from the third capacitor C3 to the third operating unit 43.

  One end of the fourth capacitor C4 is connected between the fourteenth switch SW14 and the twenty-fourth switch SW24, and the other end is grounded to temporarily store the power supplied from the DC / DC converter 10. Accordingly, the microcomputer 44 is supplied to the microcomputer 44 when the microcomputer 44 operates. The fourteenth switch SW14 switches whether power can be supplied from the DC / DC converter 10 to the fourth capacitor C4. The twenty-fourth switch SW24 switches whether power can be supplied from the fourth capacitor C4 to the microcomputer 44. Note that the selection state of the fourteenth switch SW14 is set to ON in the default state where no control signal is input, so that the period in which the DC / DC converter 10 is operated even if the microcomputer 44 is down due to battery exhaustion. Then, the microcomputer 44 can be operated.

  The electric capacities of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 (hereinafter collectively referred to as capacitors C1 to C4, etc .; the power storage unit) are the operating units 41 to 43 and The values may be appropriately determined according to the power consumption (current consumption) per cycle of the microcomputer 44 and may be different from each other. Here, normal capacitors are used for these capacitors C1 to C4, but various types of capacitors such as electrolytic capacitors and electric double layer capacitors are used depending on the required capacity and the size that can be arranged in the electronic device 1. May be.

Next, operations of the operation units 41 to 43 in the electronic device 1 of the present embodiment will be described.
FIG. 2 shows the operation timing of the operation units 41 to 43 of the electronic apparatus 1 of the present embodiment, the operation timing of the DC / DC converter 10 according to these, the eleventh switch SW11 to the fourteenth switch SW14, and the twenty-first switch. It is a figure which illustrates the timing which switches ON / OFF of SW21-24th switch SW24.

  In the electronic apparatus 1 according to the present embodiment, the operation units 41 to 43 perform an intermittent operation (periodically) every period, with the period of the timings T1 to T2 as one period. Here, the 3rd operation | movement part 43 performs intermittent operation | movement for every predetermined time 3 times within a period. The second operation unit 42 operates by an operation time longer than the operation time (operation period) of the third operation unit 43 twice in the cycle. The first operation unit 41 operates for an operation time longer than the operation time (operation period) of the second operation unit 42 once at the beginning of each cycle. Here, it is assumed that the power consumption during the operation period of each of the operation units 41 to 43, that is, the current consumption value is the same. Therefore, the total current consumption values of the operation units 41 to 43 and the microcomputer 44 are highest at the beginning of each cycle, and become smaller thereafter. Here, a reference value Ic that exceeds the total current consumption value is set only in the first section of each cycle.

  Among the 21st switch SW21 to 24th switch SW24 (output cut-off switching element), the 21st switch SW21 to 23rd switch SW23 are turned on in synchronization with the operation period of each of these operation units 41 to 43, and the capacitors C1 to C1. Power is supplied from C3. Since the microcomputer 44 operates continuously as described above, the 24th switch SW24 is maintained in the ON state, and power is continuously supplied from the capacitor C4.

  On the other hand, the eleventh switch SW11 to the fourteenth switch SW14 (current cutoff switching element, first backflow cutoff unit) are periods in which the operating units 41 to 43 at the beginning of each period operate simultaneously, that is, the operating units 41 to 43 and the microcomputer. It is turned on in synchronization only during a period when the total current value of 44 is equal to or greater than the reference value Ic, and is turned off during other periods. In addition, the DC / DC converter 10 operates in accordance with a period in which all of the eleventh switch SW11 to the thirteenth switch SW13 are turned on and supplies power, and the power supply is stopped in a period in which the eleventh switch SW11 is turned off. As a result, power is not output from the DC / DC converter 10 in other periods (at this time, the operation of the DC / DC converter 10 (such as PWM operation or PFM operation) may not be performed simultaneously). The power (charge) stored in the capacitors C <b> 1 to C <b> 4 is prevented from flowing to other capacitors or backflowing to the DC / DC converter 10 due to the non-uniformity.

FIG. 3 is a diagram illustrating an example of operation efficiency characteristics of the DC / DC converter 10.
Since the DC / DC converter 10 usually generates an internal consumption current or a leakage current, the operation efficiency increases monotonically as the output current is larger than the internal consumption current. Although specific output current and operating efficiency values vary depending on the components used in the DC / DC converter 10, sufficient operating efficiency can be obtained in a period in which the power consumption (current consumption) of the operating units 41 to 43 is large. In addition, by operating the DC / DC converter 10 selectively during a period in which the operating units 41 to 43 operate simultaneously, the operating efficiency of the DC / DC converter 10 can be kept high. .

  In the electronic apparatus 1 according to the present embodiment, the operation timing information of the operation units 41 to 43 and information related to the current consumption during operation are held in the microcomputer 44 as load operation setting information 442 in advance. The microcomputer 44 refers to the load operation setting information 442 to supply power from the capacitors C1 to C3 at the operation timing of the operation units 41 to 43, and the total current consumption of the operation units 41 to 43 and the microcomputer 44 itself is predetermined. In this case, the DC / DC converter 10 is operated to supply power to the operation units 41 to 43 and the microcomputer 44 directly while charging the capacitors C1 to C4. Here, for example, one cycle is divided into 12 sections, and on / off of each switch is controlled for each section.

  Note that the operation timings of the operation units 41 to 43 are not necessarily limited to the case where they are fixed to the same period every cycle. For example, when the operation frequency of the operation unit 43 is changed according to the measurement value of the sensor of the operation unit 42, the operation unit 41 (control unit) acquires data from the operation unit 42 during the operation and performs arithmetic processing. The load operation setting information 442 related to the operation period of the operation unit 43 can be rewritten. In this case, the load can be concentrated by setting the operation period of the operation unit 43 in synchronization with the operation period of the operation unit 42 or the next operation unit 41 appropriately.

FIG. 4 is a diagram illustrating an example of the load operation setting information 442.
For each of the operating units 41 to 43 and the microcomputer 44, an expected current consumption value for one period is shown for each section. A section with a consumption current value of “0” is a non-operating section, and a section with non-zero values “A” and “B” is an operating section. When the current consumption value of the microcomputer 44 can change depending on the operation content, an average value may be used as it is, or may be adjusted as needed according to the operation state. These pieces of information are set in advance by the operation unit 41 (control unit) based on a user input operation via an operation unit such as a keyboard (not shown), and are sent to the microcomputer 44 and written therein.

FIG. 5 is a diagram illustrating another example of the operation timing of the operation units 41 to 43 in the electronic apparatus of the present embodiment and the operation timing of the DC / DC converter 10 corresponding thereto.
When the current consumption during operation of each of the operation units 41 to 43 is different, when all the loads are concentrated, the stable power supply capability of the DC / DC converter 10 is exceeded, or the operation limit of the operation units 41 to 43 ( For example, when there is an adverse effect on each other when operated simultaneously, the period of time equal to or greater than the reference value Ic is not limited to the timing at which all the operation units 41 to 43 and the microcomputer 44 operate.

FIG. 6 is a flowchart illustrating a control procedure by the CPU 444 of the microcomputer 44 of the power supply control process executed in the electronic apparatus 1 of the present embodiment.
This power supply control process is continuously executed while the operation units 41 to 43 are regularly operated.

  When the power supply control process is started, the CPU 444 sets “0” to the section number N as an initial value, and also supplies an integrated supply current It (from the operating units 41 to 43 and the capacitors C1 to C4 of the microcomputer 44. k) (k = 1 to 4) are respectively set to “0” (step S101).

The CPU 444 refers to the load operation setting information 442, and calculates the operation current values I (k, N) (k = 1 to 4) of the first operation unit 41 to the third operation unit 43 and the microcomputer 44 in the interval of the interval number N. Obtain (step S102). The CPU 444 adds the obtained operating current values of the respective operating units to calculate a total consumption current value Σ _k I (k, N), which is a total value of these (step S103).

The CPU 444 determines (monitors) whether or not the total consumption current value Σ _k I (k, N) is equal to or greater than the reference current value (step S104). When it is determined that the current value is greater than or equal to the reference current value (when the total current consumption value Σ _k I (k, N) greater than or equal to the reference voltage value is detected) (“YES” in step S104), the CPU 444 determines the section number. The eleventh switch SW11 to the fourteenth switch SW14 in the N section are set to ON (step S105). Further, the CPU 444 initializes the integrated supply current It from the operating units 41 to 43 and the capacitors C1 to C4 of the microcomputer 44 to “0” (step S106). Then, the process of the CPU 444 proceeds to step S110.

When it is determined that the total consumption current value Σ _k I (k, N) is not equal to or less than the reference current value (“NO” in step S104), the CPU 444 includes the operation units 41 to 43 and the microcomputer. The operating current value I (k, N) is added to the integrated supply current It (k) from the 44 capacitors C1 to C4 (step S107).

  The CPU 444 determines whether or not at least one of the supply current integrated value It (k) (supply power amount) is equal to or greater than the operation limit value (upper limit power amount) of each of the corresponding capacitors C1 to C4 (step S108). . If it is determined that at least one is equal to or greater than the operation limit value (“YES” in step S108), the processing of the CPU 444 proceeds to step S105. When it is determined that none of them is equal to or less than the operation limit value (“NO” in step S108), the CPU 444 turns off the eleventh switch SW11 to the fourteenth switch SW14 in the section of the section number N. Setting is made (step S109). Then, the process of the CPU 444 proceeds to step S110.

  When the process proceeds from the process of step S106 or step S109 to the process of step S110, the CPU 444 switches the twenty-first switches SW21 to SW21 corresponding to the operation units 41 to 43 and the microcomputer 44 whose operating current value I (k, N) is not zero, respectively. The switch SW24 is set on, and the remaining switches that are not set on are set off (step S110). The operations of the 21st switch SW21 to the 24th switch SW24 related to the operation setting are interrupted at each timing. The CPU 444 waits until the head timing of the section number N, and operates the eleventh switch SW11 to the fourteenth switch SW14 and the twenty-first switch SW21 to the twenty-fourth switch SW24 in synchronization with the setting at the head timing (step S111).

  The CPU 444 adds “1” to the section number N (step S112). At this time, when the section number N becomes “12”, the value of the section number N is returned to “0”. Then, the process of the CPU 444 returns to step S102.

As described above, the electronic apparatus 1 according to the present embodiment includes the DC / DC converter 10, the operation units 41 to 43 and the microcomputer 44 that perform operations related to predetermined functions, and the operations of the operation units 41 to 43 and the microcomputer 44. And a microcomputer 44 as a supply control unit for stopping the power supply from the DC / DC converter 10 during a period when the current is less than the predetermined reference value Ic.
As a result, the operating currents of the operating units 41 to 43 and the microcomputer 44 are small, and power is supplied from the DC / DC converter 10 during a period in which the operating efficiency is expected to be low even if the DC / DC converter 10 is operated. Since this is not performed, it is possible to prevent a decrease in the operating efficiency of the DC / DC converter 10.

In addition, capacitors C1 to C4 that store part of the power supplied by the DC / DC converter 10 are provided, and the microcomputer 44 operates the operation unit 41 during a period in which the power supply from the DC / DC converter 10 is stopped. To 43 and the microcomputer 44 are operated by the electric power stored in the capacitors C1 to C4.
Therefore, while the capacitors C1 to C4 are charged, the output current of the DC / DC converter 10 is more concentrated, while the discharge from the capacitors C1 to C4 stabilizes the operation even if no power is supplied from the DC / DC converter 10. Therefore, it is not necessary to impair the operation capabilities (specs) of the operation units 41 to 43 and the microcomputer 44 or to prepare a battery separately.

  Further, the microcomputer 44 supplies power from the DC / DC converter 10 to the capacitors C1 to C4, the operation units 41 to 43, and the microcomputer 44 when the operation currents of the operation units 41 to 43 and the microcomputer 44 are equal to or greater than a predetermined reference value Ic. Let the supply go. Therefore, the operation efficiency of the DC / DC converter 10 can be further increased, and the DC / DC converter 10, the operation units 41 to 43, and the microcomputer 44 can be efficiently operated.

In particular, a plurality of operation units 41 to 43 and a plurality of microcomputers 44 are provided as power supply destinations, and capacitors C1 to C4 are provided for the plurality of operation units 41 to 43 and the microcomputers 44, respectively. Power supply from the DC / DC converter 10 when the total consumption current value Σ _k I (k, N), which is the total value of the operation currents of the plurality of operation units 41 to 43 and the microcomputer 44, is less than a predetermined reference value Ic. The operation units 41 to 43 and the microcomputer 44 are operated by the electric power stored in each of the capacitors C1 to C4.
As described above, when power is supplied to a plurality of operation units, the DC / DC converter 10 corresponds to the total consumption current value Σ _k I (k, N) of the operation units 41 to 43 and the microcomputer 44. Similarly, the operation efficiency can be increased by operating.

That is, the microcomputer 44 has a plurality of capacitors when the total consumption current value Σ _k I (k, N), which is the total value of the operation currents of the plurality of operation units 41 to 43 and the microcomputer 44, is equal to or greater than a predetermined reference value Ic. Since power is supplied to C1 to C4 and the plurality of operating units 41 to 43 and the microcomputer 44 respectively corresponding to the plurality of capacitors C1 to C4, the operating efficiency of the DC / DC converter 10 is maintained high, Electric power can be appropriately supplied to the operation units 41 to 43 and the microcomputer 44.

  Further, the power supply from the capacitors to the operation unit (microcomputer) is cut off between the plurality of capacitors C1 to C4 and the operation units 41 to 43 and the microcomputer 44 respectively corresponding to the plurality of capacitors C1 to C4. The twenty-first switch SW21 to the twenty-fourth switch SW24 are provided, the plurality of operation units 41 to 43 operate intermittently, and the microcomputer 44 performs a twenty-first operation corresponding to a period during which the operation units 41 to 43 do not operate. The switches SW21 to SW24 are turned off. Accordingly, current leakage from the capacitors C1 to C4 can be prevented when the operation units 41 to 43 are not operating. Therefore, during the period when the power supply from the DC / DC converter 10 is stopped, the operation units 41 to 43 are stopped. The power corresponding to the operation can be supplied to the operation units 41 to 43 more efficiently.

  In addition, an eleventh switch SW11 to a fourteenth switch SW14 are provided between the DC / DC converter 10 and each of the capacitors C1 to C4 to cut off the current between the plurality of capacitors C1 to C4. As a result, when the DC / DC converter 10 is not in operation, current is generated between the capacitors C1 to C4 due to the difference in the amount of current supplied from the capacitors C1 to C4 to the operating units 41 to 43 and the microcomputer 44, respectively. This can prevent an increase in loss due to generation of unnecessary current.

  Further, the microcomputer 44 turns on the eleventh switch SW11 to the fourteenth switch SW14 during the period when the power supply from the DC / DC converter 10 is being performed, and the eleventh period during which the power supply is stopped. By turning off the switch SW11 to the fourteenth switch SW14, backflow (around) from the capacitors C1 to C4 to the DC / DC converter 10 is prevented when the DC / DC converter 10 is not operating, and the capacitors C1 to C4 Thus, the generation of current due to the difference in the amount of current supplied to each of the operation units 41 to 43 and the microcomputer 44 can be prevented, and wasteful charging and an increase in loss due to generation of unnecessary current can be suppressed.

The microcomputer 44 operates as a monitoring unit that monitors the amount of power supplied from the capacitors C1 to C4 to the operation units 41 to 43 and the microcomputer 44, and the microcomputer 44 stops the power supply from the DC / DC converter 10. When it is detected that the amount of power supplied during the period is equal to or greater than a predetermined operation limit value related to the capacitors C1 to C4, the power supply from the DC / DC converter 10 is performed.
As a result, even if the interval of normal power supply from the DC / DC converter 10 is increased, or the operating currents of the operation units 41 to 43 and the microcomputer 44 are unexpectedly increased, they can be supplied from the capacitors C1 to C4. When the power is insufficient and / or the voltage is lower than the required voltage, it is possible to supply power from the DC / DC converter 10 as an exception. The microcomputer 44 can be operated more stably.

  Capacitors C1 to C4 are capacitors and can store power easily and without loss.

  Further, by using the DC / DC converter 10, if the output current is an appropriately large value, the operation efficiency can be extremely increased, and the loss in power supply can be reduced.

In addition, the power supply control method of the electronic apparatus 1 according to the present embodiment including the DC / DC converter 10, the operation units 41 to 43 that perform operations related to a predetermined function, and the microcomputer 44 includes the operation units 41 to 43 and A supply interruption step of stopping the power supply from the DC / DC converter 10 during a period when the operating current of the microcomputer 44 is less than the predetermined reference value Ic is included.
Accordingly, the power supply from the DC / DC converter 10 is supplied during a period when the total value of the operating currents of the operating units 41 to 43 and the microcomputer 44 is small and the operating efficiency is low even when the DC / DC converter 10 is operated. Since this is not performed, it is possible to prevent a decrease in the operating efficiency of the DC / DC converter 10.

[Second Embodiment]
Next, an electronic apparatus according to a second embodiment of the present invention will be described.
FIG. 7 is a schematic diagram illustrating a circuit configuration of the electronic apparatus 1a according to the second embodiment.

  The electronic device 1a of the second embodiment includes a microcomputer 44a instead of the microcomputer 44, and the microcomputer 44a has power supply setting information 443. Other configurations are the same as those of the electronic apparatus 1 of the first embodiment, and the same components are denoted by the same reference numerals and description thereof is omitted.

  In the electronic apparatus 1a of the present embodiment, the power supply setting information 443 is stored in a register of the microcomputer 44a, and the timings at which the eleventh switch SW11 to the fourteenth switch SW14 are turned on and off are defined in advance. Further, the load operation setting information 442 is stored and held in the register of the microcomputer 44a or the like as defining the switching timing of the 21st switch SW21 to the 24th switch SW24. Since the microcomputer 44a switches each switch in hardware based on these pieces of information, the CPU 444 does not perform the switching operation. Accordingly, the supply of the clock signal to the CPU 444, that is, the operation of the CPU 444 may be normally stopped unless other processing is required.

  The method for determining the switching timing is the same as that of the electronic device 1 of the first embodiment, and a detailed description thereof is omitted. These settings are performed in advance by the first operation unit 41 and sent to the microcomputer 44a, so that the microcomputer 44a performs the switching operation of the eleventh switch SW11 to the fourteenth switch SW14 and the twenty-first switch SW21 to the twenty-fourth switch SW24. Do.

  As described above, the electronic device 1a of the second embodiment performs the switching operation of the eleventh switch SW11 to the fourteenth switch SW14 and the twenty-first switch SW21 to the twenty-fourth switch SW24 without using the CPU 444 of the microcomputer 44a. While suppressing unnecessary power consumption of 44a, the processing of each switch is appropriately performed at a high speed with a simpler process, and the DC / DC is not used except during the period when the total current value of the operation units 41 to 43 and the microcomputer 44 is large. By stopping the power supply from the converter 10, the operation efficiency can be maintained high.

[Third Embodiment]
Next, an electronic apparatus according to a third embodiment will be described.
FIG. 8 is a schematic diagram illustrating a circuit configuration of the electronic apparatus 1b according to the third embodiment.
In this electronic device 1b, compared to the electronic device 1 of the first embodiment, the microcomputer 44 is replaced with the microcomputer 44b, and the current measuring units A1 to A1 that measure the supply current to the operating units 41 to 43 and the microcomputer 44b. Except for the point provided with A4 (power measurement unit), the same components are denoted by the same reference numerals, and description thereof is omitted.

The measured current values Io (k) (k = 1 to 4) measured by the current measuring units A1 to A4 are sent to the microcomputer 44b.
The microcomputer 44b includes a current value comparison unit 443b. The current value comparison unit 443b digitizes the acquired actual measurement current value Io (k) at a predetermined sampling rate, adds the obtained values, and compares them with the reference value Ic. The sampling period related to this sampling rate can be set sufficiently shorter than the length of the section described above.

  FIG. 9 is a flowchart showing a control procedure by the CPU 444 of the power supply control process executed by the electronic apparatus 1 of the present embodiment. Compared with the power supply control process of the first embodiment, this power supply control process includes the process of step S102b, and the processes of steps S103, S104, and S107 are replaced with the processes of steps S103b, S104b, and S107b, respectively. It is the same except for the replaced point, and the same processing is denoted by the same reference numeral and description thereof is omitted.

Following the process of step S102, the CPU 444 acquires an actually measured current value Io (k) by the current measurement unit Ak (k = 1 to 4) (step S102b). The CPU 444 causes the current value comparison unit 443b to calculate the total measured current value Σ _k Io (k) (step S103b), and whether or not the total measured current value Σ _k Io (k) is greater than or equal to the reference value Ic. Is discriminated (step S104b).

  If it is determined that the value is equal to or greater than the reference value Ic (“YES” in step S104b), the processing of the CPU 444 proceeds to step S105. If it is determined that it is not greater than (or less than) the reference value Ic (“NO” in step S104b), the CPU 444 adds each measured current value Io (k) to It (k) (step S107b). . Then, the process of the CPU 444 proceeds to step S108.

  As described above, the electronic apparatus 1b according to the third embodiment includes the current measuring unit that measures the power supplied to the operating units 41 to 43 and the microcomputer 44 (corresponding to power if the current consumption and voltage are predetermined values). The microcomputer 44 includes A1 to A4, and switches the availability of power supply from the DC / DC converter 10 based on the measured current value Io (k) measured by the current measuring unit Ak (k = 1 to 4). Therefore, when the operation currents of the operation units 41 to 43 and the microcomputer 44 are difficult to predict due to non-uniformity or the situation corresponding to the condition is finely distributed even if prediction is possible, the processing to be set in advance is complicated. In such a case, whether or not the DC / DC converter 10 can be supplied with power can be switched easily and appropriately by directly inputting the actual measurement value to the comparison circuit or the like.

  In addition, by causing each process by the CPU 444 of the present embodiment to be performed by hardware using the logic circuit of the current value comparison unit 443b, the eleventh switches SW11 to SW11 are not performed via the CPU 444, similarly to the process of the second embodiment. The 14 switch SW14 and the 21st switch SW21 to the 24th switch SW24 can be switched on and off.

  Further, in addition to the current measurement units A1 to A4, a voltage measurement unit that measures the voltage values of the capacitors C1 to C4 is provided, and instead of the processing of steps S107b and S108, the voltage value is compared with a predetermined lower limit value. The on / off setting of the eleventh switch SW11 to the fourteenth switch SW14 may be performed. Further, the power consumption may be calculated by calculating power from the current measurement value and the voltage measurement value.

[Fourth Embodiment]
Next, an electronic apparatus according to a fourth embodiment will be described.
FIG. 10 is a schematic diagram illustrating a circuit configuration of an electronic apparatus 1c according to the fourth embodiment.

  Compared with the electronic device 1a of the second embodiment, the electronic device 1c of the present embodiment includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and an intermediate switch SWT ( The second backflow blocking unit and the intermediate capacitor CT (intermediate power storage unit) are the same except that they are added, and the same components are denoted by the same reference numerals and description thereof is omitted.

  The intermediate switch SWT switches whether power can be supplied from the DC / DC converter 10 to the intermediate capacitor CT. When the intermediate switch SWT is turned off in response to the switching signal from the microcomputer 44, the power supply from the DC / DC converter 10 to the intermediate capacitor CT and thereafter is cut off, and the intermediate switch SWT is turned on. Thus, it is possible to supply power from the DC / DC converter 10 to the intermediate capacitor CT and thereafter.

  The intermediate capacitor CT temporarily stores the power output from the DC / DC converter 10 and supplies the power to the capacitors C1 to C4 according to the situation. The electric capacity of the intermediate capacitor CT is set to be at least larger than the electric capacity of the capacitors C1 to C3.

  The first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 (hereinafter collectively referred to as diodes D1 to D4, etc.) In the electronic device 1c of this embodiment, the eleventh switch SW11 to the fourteenth switch SW14. And the first backflow blocking unit) are provided between the eleventh switch SW11 to the fourteenth switch SW14 after the output of the intermediate capacitor CT is branched to the operation units 41 to 43 and the microcomputer 44, respectively. The backflow from each of the capacitors C1 to C4 to the other capacitor, the intermediate capacitor CT, and the DC / DC converter 10 is prevented.

Next, the power supply operation of this embodiment will be described.
FIG. 11 shows the operation timing of the operation units 41 to 43 of this embodiment, the operation timing of the DC / DC converter 10 according to these, the eleventh switch SW11 to the fourteenth switch SW14, the twenty-first switch SW21 to the twenty-fourth. It is a figure which illustrates the timing which switches on / off of switch SW24 and intermediate | middle switch SWT.

  The intermediate switch SWT is turned on in synchronization with the operation timing of the DC / DC converter 10. At this time, since the eleventh switch SW11 to the fourteenth switch SW14 and the twenty-first switch SW21 to the twenty-fourth switch SW24 are also turned on at the same time, the DC / DC converter 10 charges the intermediate capacitor CT and the capacitors C1 to C4, and the operation unit 41 to 43 and the power supply to the microcomputer 44 are performed simultaneously.

  Further, when the DC / DC converter 10 is not in operation, the intermediate switch SWT is turned off, so that the backflow from the intermediate capacitor CT to the DC / DC converter 10 is prevented.

  On the other hand, in the electronic device 1c, the eleventh switch SW11 to the fourteenth switch SW14 are turned on during the period when no power is supplied from the DC / DC converter 10, and power is supplied from the intermediate capacitor CT to any of the capacitors C1 to C4. May be supplied. Here, the thirteenth switch SW13 is turned on, and power is supplied from the intermediate capacitor CT to the third capacitor C3. At this time, when the voltage of the intermediate capacitor CT is lower than the voltage of the third capacitor C3, the third diode D3 functions to prevent backflow. Similarly, when a plurality of eleventh switches SW11 to SW14 are simultaneously turned on, the diodes D1 to D4 are configured so that no current flows between the capacitors C1 to C4 corresponding to the simultaneously turned on switches. Works.

  In the electronic device 1c of the present embodiment, the first operating unit 41 sets in advance a period during which the intermediate switch SWT is turned on in synchronization with the operation timing of the DC / DC converter 10, and the estimated current amount, That is, the operation (opening / closing) setting of the eleventh switch SW11 to the fourteenth switch SW14 is made according to the storage state of the capacitors C1 to C4. The operation setting information of each switch is sent to the microcomputer 44a and stored as power supply setting information 443, and the switching operation of each switch is performed in synchronization with the clock signal output from the oscillation circuit 441 as a hardware operation.

FIG. 12 is a flowchart illustrating a control procedure by the first operation unit 41 of the operation setting process executed in the electronic apparatus 1c of the present embodiment.
This operation setting process is activated and executed every time the first operation unit 41 is intermittently operated.

  The first operation unit 41 (CPU) sets the operation periods of the operation units 41 to 43 and the microcomputer 44 in the next cycle (step S401). At this time, the 1st operation part 41 can acquire measurement data by sensors, such as other operation parts 42 and 43, and can use it for a setting as needed.

  The first operation unit 41 estimates the amount of electricity stored in the capacitors C1 to C4 (step S402). The first operation unit 41 sets the operation timing of the intermediate switch SWT and the eleventh switch SW11 to the fourteenth switch SW14 in accordance with the amount of stored electricity (step S403). The setting of the operation period and the setting related to the operation timing of the switch are respectively written in the load operation setting information 442 and the power supply setting information 443 of the microcomputer 44a (step S404). Then, the first operation unit 41 ends the operation setting process.

  Note that in the electronic apparatus 1c of the present embodiment, the CPU 444 may perform switching control of each switch by software at the above-described timing. Further, similarly to the electronic device 1b of the third embodiment, all the switches including the intermediate switch SWT are turned on according to the measured current value Io (k) measured, and the output currents of the capacitors C1 to C4 are the reference values. In the above case, the eleventh switch SW11 to the fourteenth switch SW14 may be turned on to supply power to some or all of the capacitors C1 to C4 from the intermediate capacitor CT.

As described above, the electronic device 1c according to the fourth embodiment adjusts the operation timings of the operation units 41 to 43 that operate intermittently and aligns the operation timings of the operation units 41 to 43, thereby obtaining a total value of the operation current. A control unit (first operation unit 41) is provided that causes a certain total consumption current value Σ _k I (k, N) to be equal to or greater than a predetermined reference value Ic.
As described above, when the timing of the intermittent operation can be aligned, the electronic device 1c intentionally generates a timing at which power can be efficiently supplied from the DC / DC converter 10, and the DC / DC It is possible to supply power from the converter 10 more efficiently.

  In addition, the operation units 41 to 43 (or at least two of them) operate periodically, and the control unit (first operation unit 41) synchronizes at least two operation periods of the operation units 41 to 43. Thus, the total value of the operating current in the synchronized operating period is set to be equal to or greater than a predetermined reference value Ic in each cycle. As a result, the power supply from the DC / DC converter 10 is periodically and surely performed every cycle. Therefore, the capacitors C1 to C4 are operated by the efficient operation of the DC / DC converter 10 with easier processing. Thus, stable power supply can be performed to the operation units 41 to 43 and the microcomputer 44 while maintaining the amount of stored power.

In addition, an intermediate capacitor CT that stores a part of the power supplied by the DC / DC converter 10 between the DC / DC converter 10 and the eleventh switch SW11 to the fourteenth switch SW14 is provided, and the eleventh switch SW11 to the fourteenth switch. In series with each of the switches SW14, diodes D1 to D4 that prevent backflow from the capacitors C1 to C4 are provided, and the microcomputer 44 is in the eleventh period during which power is supplied from the DC / DC converter 10. During the period when the switch SW11 to the fourteenth switch SW14 are turned on and the power supply is stopped, the capacitors C1 to C4 and the operation units 41 to 43 determined according to the storage status of the capacitors C1 to C4, and the intermediate capacitor to the microcomputer 44 The eleventh switch SW11 to the fourteenth switch SW14 are opened / closed depending on whether or not power can be supplied from the CT.
Therefore, when the power supply from the DC / DC converter 10 is stopped and the amount of power stored in the capacitors C1 to C4 is insufficient, the power is selectively supplied from the intermediate capacitor CT to the necessary capacitor. Supply can be made. Further, even when power is supplied to the plurality of capacitors C1 to C4, it is possible to prevent a current from flowing between them. In addition, backflow from the capacitors C1 to C4 to the intermediate capacitor CT can be prevented. As a result, the power supply from the DC / DC converter 10 can be maintained in an efficient period, and the generation of unnecessary current can be suppressed, and the capacitors C1 to C1 can be more stably even during the non-operating period of the DC / DC converter 10. Power can be supplied from the C4 to the operation units 41 to 43 and the microcomputer 44.

  In addition, since the intermediate switch SWT for preventing the backflow of current from the intermediate capacitor CT to the DC / DC converter 10 is provided, the operation of the DC / DC converter 10 is stopped when no current is output from the DC / DC converter 10. While preventing backflow from the intermediate capacitor CT. As a result, it is possible to reduce waste due to generation of unnecessary current and to suppress the malfunction of the DC / DC converter 10 and to appropriately maintain the amount of power stored in the intermediate capacitor CT.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above-described embodiment, the on / off control of the power supply from the DC / DC converter 10 is similarly applied to the microcomputer 44. However, even if the microcomputer 44 is operated separately using a dry battery, a button-type battery, or the like. good.

  In addition, the microcomputer 44 may be operated more stably by using a secondary battery instead of the fourth capacitor C4. In this case, it is necessary to turn on the 14th switch SW14 so that the secondary battery can be charged. Alternatively, in the electronic device 1c of the fourth embodiment, the charge stored in the intermediate capacitor CT may be used exclusively for charging the secondary battery. In addition, when necessary for charging the secondary battery, a configuration relating to PWM may be further provided between the fourteenth switch SW14 and the secondary battery.

  In the above embodiment, the capacitors C1 to C4 are charged when power is supplied from the DC / DC converter 10, and the capacitors C1 to C4 are operated to the operating units 41 to 43 and the microcomputer 44 while the power is not supplied. A dry battery or button type battery that can supply power at an appropriate voltage directly without supplying capacitors C1 to C4 (that is, internal power consumption does not occur in the power supply operation or is sufficiently small) without power supply. An auxiliary power supply unit (auxiliary power supply unit) may be provided, and the power supply source to the operation units 41 to 43 and the microcomputer 44 may be switched.

  Moreover, in the said embodiment, although discriminate | determined by the total operating current value of the operation parts 41-43 and the microcomputer 44, as an actual process, the number of the operation parts which operate | moved may be sufficient. Further, the reference value Ic is determined according to the ratio of the current consumption in one cycle of the operation units 41 to 43 and the microcomputer 44 and the current supply amount in the ON period of the eleventh switch SW11 to the fourteenth switch SW14. It is not limited to the period with the largest current consumption (the load is large) in each cycle.

  In the above embodiment, the operation units 41 to 43 have been described by taking as an example the case where the operation units 41 to 43 operate at a cycle of 1 / integer with respect to the same cycle or the longest cycle. However, it is not necessary to operate in such a relationship cycle. For example, the blinking cycle of the operation unit for performing the blinking operation of the LED does not have to be limited to 1 / integer of the operation cycle of the control unit, and is an intermittent pattern such as a random blinking pattern. Also good.

  Moreover, in the said embodiment, although the electrical storage condition of the capacitors C1-C4 was discriminate | determined, even if a total consumption current value was less than a reference current value, it was decided that electric power could be supplied from the DC / DC converter 10, When the periodic operation is fixed and such a situation is not assumed, the processing related to the monitoring of the storage state (steps S107 and S108 in FIG. 6) may be omitted.

  The operation setting of the microcomputer 44 is not limited to that performed by the first operation unit 41. The microcomputer 44 may include a specific external input terminal, and may acquire load operation setting information 442 and power supply setting information 443 set by an electronic device such as an external computer.

In the above embodiment, the DC / DC converter, which is a switching regulator, is used as the power supply unit that generates and outputs the operating voltages of the operating units 41 to 43 and the microcomputer 44 from the input power. The power supply unit according to the present invention can be applied to all types in which a certain amount of internal power consumption occurs when generating and outputting an operating voltage. In particular, the internal power consumption increases rather to reduce the current consumption. It is preferably applied to things. Therefore, the power supply unit includes, for example, a case where an LDO that is a linear regulator is used. In order to increase the supply voltage, a switching regulator including a charge pump circuit may be used.
In addition, specific details such as the configuration, the control procedure, and the operation content described in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, and includes the scope of the invention described in the claims and equivalents thereof. .
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.

[Appendix]
<Claim 1>
A power supply unit;
A function operation unit for performing an operation related to a predetermined function;
A supply control unit for stopping power supply from the power supply unit during a period when the operating current of the functional operation unit is less than a predetermined reference value;
An electronic device comprising:
<Claim 2>
A power storage unit that stores part of the power supplied by the power supply unit,
The said supply control part makes the operation | movement of the said function operation | movement part perform with the electric power which the said electrical storage part stored during the period which has stopped the electric power supply from the said electric power supply part. Electronics.
<Claim 3>
The power supply unit causes the power storage unit and the functional operation unit to supply power when an operating current of the functional operation unit is equal to or greater than the predetermined reference value. 2. The electronic device according to 2.
<Claim 4>
A plurality of the functional operation units are provided,
The power storage unit is provided for each of the plurality of functional operation units,
The supply control unit stops power supply from the power supply unit when a total value of operation currents of the plurality of functional operation units is less than a predetermined reference value, and the power stored by each of the power storage units 4. The electronic apparatus according to claim 2, wherein the function operation unit is operated.
<Claim 5>
The supply control unit includes the plurality of power storage units and the plurality of functional operation units respectively corresponding to the plurality of power storage units when a total value of operating currents of the plurality of functional operation units is equal to or greater than the predetermined reference value. Electric power is supplied to the electronic device according to claim 4.
<Claim 6>
Each of the plurality of power storage units and the functional operation unit corresponding to each of the plurality of power storage units is provided with an output cutoff switching element that blocks power supply from the power storage unit to the functional operation unit,
At least some of the plurality of functional operation units operate intermittently,
The electronic device according to claim 4, wherein the supply control unit turns off the output cutoff switching element during a period in which the functional operation unit does not operate.
<Claim 7>
An operation setting unit that adjusts the operation timings of the at least some of the functional operation units to align the operation timings of the plurality of functional operation units so that the total value of the operation currents is equal to or greater than the predetermined reference value; The electronic device according to claim 6.
<Claim 8>
At least two of the plurality of functional operation units operate periodically,
The operation setting unit synchronizes at least two operation periods of the at least two functional operation units, and causes the total value of the operation currents in the synchronized operation period to be greater than or equal to the predetermined reference value in each cycle. The electronic device according to claim 7.
<Claim 9>
The first backflow blocking unit that blocks current between the plurality of power storage units is provided between each of the power supply unit and the plurality of power storage units. The electronic device according to one item.
<Claim 10>
The first backflow interrupter includes a current interrupting switching element,
The supply control unit turns on the current cutoff switching element during a period in which power supply from the power supply unit is performed, and turns off the current cutoff switching element in a period during which the power supply is stopped. 10. The electronic device according to claim 9, wherein
<Claim 11>
An intermediate power storage unit that stores part of the power supplied by the power supply unit between the power supply unit and the first backflow blocking unit;
The first backflow interrupting unit includes a current interrupting switching element and a diode that prevents backflow from the power storage unit,
The supply control unit turns on the current cut-off switching element during a period in which power supply from the power supply unit is performed, and according to a storage status of the power storage unit in a period in which the power supply is stopped The electronic device according to claim 9, wherein the current cutoff switching element is opened and closed according to whether or not power supply from the intermediate power storage unit to the power storage unit and the functional operation unit is determined.
<Claim 12>
The electronic device according to claim 11, further comprising a second backflow blocking unit that prevents a backflow of current from the intermediate power storage unit to the power supply unit.
<Claim 13>
A monitoring unit that monitors the amount of power supplied from the power storage unit to the functional operation unit;
In the supply control unit, the monitoring unit detects that the supply power amount during a period in which power supply from the power supply unit is stopped is equal to or greater than a predetermined upper limit power amount related to the power storage unit. In such a case, the electronic device according to any one of claims 2 to 12, wherein power is supplied from the power supply unit.
<Claim 14>
The electronic device according to claim 2, wherein the power storage unit is a capacitor.
<Claim 15>
The electronic device according to claim 1, wherein the power supply unit includes a DC / DC converter.
<Claim 16>
A power measuring unit that measures the power supplied to the functional operation unit;
The electronic device according to any one of claims 1 to 15, wherein the supply control unit switches availability of power supply from the power supply unit based on power measured by the power measurement unit. .
<Claim 17>
A power supply control method for an electronic device comprising: a power supply unit; and a functional operation unit that performs an operation related to a predetermined function,
A power supply control method for an electronic device, comprising: a supply cutoff step of stopping power supply from the power supply unit during a period in which an operating current of the functional operation unit is less than a predetermined reference value.

DESCRIPTION OF SYMBOLS 1 Electronic device 1a Electronic device 1b Electronic device 1c Electronic device 10 DC / DC converter 20 Power supply part 41 1st operation | movement part (control part)
42 second operation unit 43 third operation unit 44 microcomputer 44a microcomputer 44b microcomputer 441 oscillation circuit 442 load operation setting information 443 power supply setting information 443b current value comparison units A1 to A4 current measurement unit C1 first capacitor C2 second capacitor C3 second 3 capacitor C4 4th capacitor CT Intermediate capacitor D1 1st diode D2 2nd diode D3 3rd diode D4 4th diode SW11 11th switch SW12 12th switch SW13 13th switch SW14 14th switch SW21 21st switch SW22 22nd switch SW23 23rd switch SW24 24th switch SWT Intermediate switch

Claims (17)

A power supply unit;
A function operation unit for performing an operation related to a predetermined function;
A supply control unit for stopping power supply from the power supply unit during a period when the operating current of the functional operation unit is less than a predetermined reference value;
An electronic device comprising: A power storage unit that stores part of the power supplied by the power supply unit,
The said supply control part makes the operation | movement of the said function operation | movement part perform with the electric power which the said electrical storage part stored during the period which has stopped the electric power supply from the said electric power supply part. Electronics.   The power supply unit causes the power storage unit and the functional operation unit to supply power when an operating current of the functional operation unit is equal to or greater than the predetermined reference value. 2. The electronic device according to 2. A plurality of the functional operation units are provided,
The power storage unit is provided for each of the plurality of functional operation units,
The supply control unit stops power supply from the power supply unit when a total value of operation currents of the plurality of functional operation units is less than a predetermined reference value, and the power stored by each of the power storage units 4. The electronic apparatus according to claim 2, wherein the function operation unit is operated. The supply control unit includes the plurality of power storage units and the plurality of functional operation units respectively corresponding to the plurality of power storage units when a total value of operating currents of the plurality of functional operation units is equal to or greater than the predetermined reference value. Electric power is supplied to the electronic device according to claim 4. Each of the plurality of power storage units and the functional operation unit corresponding to each of the plurality of power storage units is provided with an output cutoff switching element that blocks power supply from the power storage unit to the functional operation unit,
At least some of the plurality of functional operation units operate intermittently,
The electronic device according to claim 4, wherein the supply control unit turns off the output cutoff switching element during a period in which the functional operation unit does not operate.   An operation setting unit that adjusts the operation timings of the at least some of the functional operation units to align the operation timings of the plurality of functional operation units so that the total value of the operation currents is equal to or greater than the predetermined reference value; The electronic device according to claim 6. At least two of the plurality of functional operation units operate periodically,
The operation setting unit synchronizes at least two operation periods of the at least two functional operation units, and causes the total value of the operation currents in the synchronized operation period to be greater than or equal to the predetermined reference value in each cycle. The electronic device according to claim 7.   The first backflow blocking unit that blocks current between the plurality of power storage units is provided between each of the power supply unit and the plurality of power storage units. The electronic device according to one item. The first backflow interrupter includes a current interrupting switching element,
The supply control unit turns on the current cutoff switching element during a period in which power supply from the power supply unit is performed, and turns off the current cutoff switching element in a period during which the power supply is stopped. 10. The electronic device according to claim 9, wherein An intermediate power storage unit that stores part of the power supplied by the power supply unit between the power supply unit and the first backflow blocking unit;
The first backflow interrupting unit includes a current interrupting switching element and a diode that prevents backflow from the power storage unit,
The supply control unit turns on the current cut-off switching element during a period in which power supply from the power supply unit is performed, and according to a storage status of the power storage unit in a period in which the power supply is stopped The electronic device according to claim 9, wherein the current cutoff switching element is opened and closed according to whether or not power supply from the intermediate power storage unit to the power storage unit and the functional operation unit is determined.   The electronic device according to claim 11, further comprising a second backflow blocking unit that prevents a backflow of current from the intermediate power storage unit to the power supply unit. A monitoring unit that monitors the amount of power supplied from the power storage unit to the functional operation unit;
In the supply control unit, the monitoring unit detects that the supply power amount during a period in which power supply from the power supply unit is stopped is equal to or greater than a predetermined upper limit power amount related to the power storage unit. In such a case, the electronic device according to any one of claims 2 to 12, wherein power is supplied from the power supply unit.   The electronic device according to claim 2, wherein the power storage unit is a capacitor.   The electronic device according to claim 1, wherein the power supply unit includes a DC / DC converter. A power measuring unit that measures the power supplied to the functional operation unit;
The electronic device according to any one of claims 1 to 15, wherein the supply control unit switches availability of power supply from the power supply unit based on power measured by the power measurement unit. . A power supply control method for an electronic device comprising: a power supply unit; and a functional operation unit that performs an operation related to a predetermined function,
A power supply control method for an electronic device, comprising: a supply cutoff step of stopping power supply from the power supply unit during a period in which an operating current of the functional operation unit is less than a predetermined reference value.

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