JP4315066B2 - Power control system - Google Patents

Description

  The present invention relates to a power supply control system in a system having a secondary battery.

Conventionally, this type of power supply control system includes a power supply path for supplying a system load after stabilizing the voltage to a necessary voltage by a stabilizing means after the AC power is converted to direct current by the direct current conversion means, and a system load from the secondary battery. The power supply path supplied to is the same (see, for example, Patent Document 1).
JP 2001-333546 A

  However, in the above-described conventional configuration, depending on the voltage fluctuation of the AC power supply or the DC conversion method of the DC conversion means, the voltage input to the stabilization means greatly fluctuates due to the influence of system load fluctuation. Accordingly, when the load fluctuation of the system is large, a load for absorbing the fluctuation is required before the stabilizing means.

  When such a configuration is used, power consumption due to this load always occurs. Therefore, even when power is supplied from the secondary battery, additional power consumption due to this load is necessary, and the capacity of the secondary battery is essentially reduced. The necessity of increasing beyond the necessary capacity has arisen, resulting in an increase in the size and cost of the secondary battery.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a power supply control system capable of performing efficient supply in consideration of power consumption when supplying power from a secondary battery to the system. And

In order to solve the above-described conventional problems, a power supply control system according to the present invention includes a DC unit for converting an input AC power source into a DC, and a power source for charging from the DC unit. A secondary battery that outputs a voltage lower than the output voltage, a first switch that controls the supply of power from the DC converter to the secondary battery, and a system that stabilizes the voltage from the DC converter Stabilizing means for supplying power to the load, a second switch for directly controlling power supply from the secondary battery to the system load, and a controller for controlling the first switch and the second switch those of having, requires a volume since the power supply path does not exist the load capacity of the secondary battery according to the system load from the secondary battery, reduction in size of the secondary battery, it is possible to reduce costs .

  According to the power supply control system of the present invention, a charge / discharge circuit using a secondary battery can be easily configured, and when supplying power from the secondary battery to the system, efficient supply is performed in consideration of power consumption. Is possible.

According to a first aspect of the present invention, there is provided a secondary unit that outputs a voltage lower than an output voltage of the DC conversion unit, supplied with a DC unit for converting the input AC power source into a DC, and a power source for charging from the DC unit. A battery, a first switch that controls supply of power from the direct current means to the secondary battery, and stabilization means that stabilizes a voltage from the direct current means and supplies power to a system load. A power supply from the secondary battery to the system is provided by including a second switch that directly controls power supply from the secondary battery to the load of the system, and a control unit that controls the first switch and the second switch. When supplying, power consumption can be suppressed and efficient power control is possible.

  According to a second aspect of the present invention, the control unit according to the first aspect is configured such that the first switch is switched according to the state of the system load, the state of the AC power supplied to the DC unit, or the state of the secondary battery. Thus, by configuring so as to control the power supply to the secondary battery, the power consumption of the system can be stabilized and the power consumption can be suppressed.

According to a third aspect of the present invention, there is provided the control unit according to the first aspect, wherein the second switch is switched according to the state of the system load, the state of the AC power supplied to the DC unit, or the state of the secondary battery. Thus , the power supply to the load of the system is controlled, and the power can be efficiently supplied to the system.

  A fourth invention includes a plurality of system loads and a plurality of second switches that control power supply from a secondary battery to the plurality of system loads, and the control unit is configured to determine the state of the plurality of system loads, Alternatively, depending on the state of the AC power supplied to the DC unit or the state of the secondary battery, the plurality of second switches can supply power to the plurality of system loads, thereby blocking the system. Therefore, it is possible to efficiently supply power to the system.

  According to a fifth aspect of the present invention, in the power supply system according to any one of the first, third, and fourth aspects, the power supply from the stabilizing means to the system load is performed via a diode. The case where power is supplied to the system and the case where power is supplied from the secondary battery to the system can be completely separated, and power can be efficiently supplied as a whole system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a block diagram of a power supply control system according to the first embodiment of the present invention.

  In FIG. 1, 1 is an AC power source such as a commercial power source, 2 is a DC unit for converting the AC power source 1 to DC, 4 is a secondary battery, and the charging switch 3 is switched by a signal from the control unit 6. The secondary battery 4 is supplied with power for charging. Reference numeral 7 denotes a load for suppressing voltage fluctuation supplied to the stabilizing means 8. Usually, the internal resistance of the secondary battery 4 increases with time of use. Therefore, charging based on this is necessary. Therefore, the supplied voltage is increased on the premise that the internal resistance of the secondary battery 4 always increases. However, if this voltage is directly input to the stabilizing means 8, the stabilizing means 8 generates a large amount of heat depending on the fluctuation of the system load. Therefore, the input voltage of the stabilizing means 8 is adjusted by inserting the load 7 in the previous stage. ing.

  A discharge switch 5 is switched by a signal from the control unit 6 and supplies power from the secondary battery 4 to the power stabilization means 8. 9 is a system load. 6 controls the voltage at the latter stage of the DC unit 2, monitors the voltage and temperature of the secondary battery 4, monitors the load fluctuation of the system load 9, and controls the charging switch 3 and the discharging switch 5. It is a control unit.

  In this system, the charging switch 3 is switched from the control unit 6 according to the AC power source such as the AC power source 1, the state of the system load 9, the voltage of the secondary battery 4, the surface temperature, etc., and the voltage is applied to the secondary battery 4. Supply and charge. If this system is used, the AC power supply such as commercial power supply or the secondary battery can be charged according to the load status of the system and the secondary battery status. For example, when the system load is low during the charging time zone If the system load increases, charging can be interrupted, the system load can be stabilized, power can be supplied efficiently, and power consumption must be constant. I can do it.

  Further, according to the state of the AC power supply 1, it is confirmed by the signal from the control unit 6 that the charging switch 3 is turned off, the discharging switch 5 is turned on, and the power supply stabilization means 8 is passed through. To supply power to the system load 9. When power is supplied from the AC power source 1 such as a commercial power source to the system load 9, it passes through the load 7 before the stabilizing means 8, but when it is supplied from the secondary battery 4 to the system load 9, the previous stage of the stabilizing means 8. Since power can be supplied to the system load 9 without going through the load 7, power can be efficiently supplied from the secondary battery 4 to the system load 9 without wasteful power consumption.

  As a result, when power is supplied from the secondary battery 4 to the system, power consumption can be reduced and efficient supply can be achieved.

(Embodiment 2)
FIG. 2 is a block diagram showing a power supply control system according to the second embodiment of the present invention.

  In FIG. 2, there are a plurality of stabilizing means 8a and 8b, and a plurality of types of voltages supplied to the system. It has a plurality of discharge switches 5a, 5b, and 5c that have a plurality of paths for supplying power from the secondary battery 4 to the stabilizing means 8 or the system load 9, and switch the power supply.

  In this system, when an abnormality such as a voltage drop or a power failure occurs in the AC power supply 1 input from the outside to the system, power is supplied only to a specific block. From the secondary battery 4 to the stabilizing means 8, the discharge switches 5a, 5b and 5c are switched. As a result, power can be supplied only to a specific block.

  For example, in a system in which a display power supply is connected to the 9V system, sensors in the 5V system, sensors in the 3.3V system, and a microcomputer are connected to the AC power supply 1, the power supply voltage drops or a power failure occurs. Assume that power is supplied to the system from the secondary battery. In this case, in order to move the minimum block, the discharge switch is switched so as to supply power to the stabilizing means for forming the 3.3V system. As a result, when the AC power supply 1 is abnormal, power is supplied to a specific block, and only the minimum block of the system can be moved.

(Embodiment 3)
FIG. 3 is a block diagram of a power supply control system according to the third embodiment of the present invention.

  In FIG. 3, there are a plurality of paths from the secondary battery 4 that do not pass through the preceding load 7 of the stabilization means 8 a, 8 b, 8 c, and a plurality of paths for supplying power to the paths by signals from the control unit 6. Discharge switches 5a, 5b and 5c. Signals from the control unit 6 can be operated independently by sending independent signals to the discharge switches.

  When this system is used, when power is supplied from the secondary battery to the system, since there are a plurality of discharge switches for switching the discharge path, the discharge switch is switched for the system after the stabilization means. Thus, power can be supplied for each block. As a result, power can be efficiently supplied to the system, and power saving can be achieved. The power supply from the load 7 to the stabilization means 8a, 8b, 8c is performed via the diode 10, so that power is supplied to circuits other than necessary when power is supplied from the secondary battery 4 to the stabilization means. The supply is prevented.

  Next, a specific example of the third embodiment will be described using an emergency call system that can be installed in a home or a building.

  In FIG. 4, the emergency call system includes a display block 11, a microphone 12, a speaker 13, various sensors 14 (for example, fire detection sensors such as heat detection, smoke detection and flame detection, human sensors such as infrared rays and pressure sensors, open / close A security sensor such as a sensor, a sensor such as a health checker that detects and manages human biological information, or the like. Information obtained from various sensors 14 is processed by the control unit 6. Information processed by the control unit 6 is notified using 11 display blocks and 13 speakers in the system according to the importance level of the information. Alternatively, it is reported to the outside through the external communication block 15.

  In this system, since power is normally supplied from an external AC power supply 1, power is supplied to all blocks. When an abnormality such as a power failure or a voltage drop occurs in the AC power source 1, power is supplied to each block from the secondary battery 4. When power is supplied from the secondary battery 4 to each block, it is possible to supply power to all blocks, but power is supplied only to a limited block according to the importance of the system. For example, if power is supplied only for a function for communicating with the outside in an emergency, power is supplied only to the microphone 12, the speaker 13, the control unit 6, and the external communication block 15. Thereby, power consumption can be suppressed as the whole system, and the role as a long-time emergency call system can be partially fulfilled.

  In addition, the microphone 12 and the speaker 13 are supplied to the respective blocks in order to supply power only at the time of use if the power supplied to the system is changed from the AC power supply 1 to the secondary battery 4 and is not always in use. It is also possible to switch the discharge switch 5 for supply. Similarly, even when information is obtained from the various sensors 14, power can be supplied efficiently by switching the discharge switch 5 in accordance with the timing to obtain information.

  As another example, it is assumed that the power supply control system of the present invention is incorporated in a terminal for centrally managing a plurality of devices in a home. Centralized control system terminals control home appliances (for example, recording systems such as air conditioners, refrigerators, washing machines, microwave ovens, TVs, videos, DVDs, security sensors, water heaters, lighting equipment, health checkers, etc.) Suppose you can. In this system, when a voltage drop or power failure occurs in the input AC power supply or the like, power is supplied from the secondary battery 4 in the power supply control system to the operation block. In each of these blocks, it is possible to supply power to a block that seems to be arbitrarily important in each usage. For example, when an important sensor, for example, a block to which a security sensor is connected, or when information is obtained through wireless communication, a discharge switch 5 is supplied by a signal from the control unit 6 so that power is supplied to the wireless block. It is possible to supply power by switching. By switching the discharge switch 5, it is possible to reduce power consumption and to control electrical appliances important for the entire system for a long time.

  As described above, the power supply control system according to the present invention can easily form a charge / discharge circuit for a secondary battery, and can efficiently supply power from the secondary battery to the system. It can be installed in general.

The block diagram of the power supply control system in Example 1 of this invention The block diagram of the power supply control system in Example 2 of this invention The block diagram of the power supply control system in Example 3 of this invention The block diagram of the power supply control system of the emergency call system in Example 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AC power supply 2 DC conversion means 3 Charge switch (1st switch)
4 Secondary battery 5 Discharge switch (second switch)
6 Control unit 7 Load 8, 8a, 8b, 8c Stabilization means 9, 9a, 9b, 9c System load 10 Diode

Claims (5)

DC conversion means for converting the input AC power source into DC,
A secondary battery that is supplied with a power source for charging from the DC unit and outputs a voltage lower than the output voltage of the DC unit;
A first switch for controlling the supply of power from the direct current means to the secondary battery;
Stabilization means for stabilizing the voltage from the DC means and supplying power to a system load; a second switch for controlling power supply directly from the secondary battery to the system load;
A control unit for controlling the first switch and the second switch;
A power supply control system comprising: The control unit controls the power supply to the secondary battery by the first switch in accordance with the state of the system load, the state of the AC power supplied to the DC unit, or the state of the secondary battery. The power supply control system according to claim 1, wherein: The control unit controls the power supply to the system load by the second switch in accordance with the state of the system load, the state of the AC power supplied to the DC unit, or the state of the secondary battery. The power supply control system according to claim 1, wherein: DC conversion means for converting the input AC power source into DC,
A secondary battery that is supplied with a power source for charging from the DC unit and outputs a voltage lower than the output voltage of the DC unit;
A first switch for controlling the supply of power from the direct current means to the secondary battery;
Stabilizing means for stabilizing the voltage from the direct current means and supplying power to a plurality of system loads; and a plurality of second means for controlling the supply of power directly from the secondary battery to the loads of the plurality of systems. A switch,
A control unit for controlling the first switch and the plurality of second switches;
A power supply control system comprising: 5. The power supply control system according to claim 1, wherein power supply from the stabilizing means to the system load is performed via a diode.

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