JP5456428B2 - DC power supply device and control method thereof - Google Patents

Description

  The present invention relates to a DC power supply device used in a communication building, a data center, and the like and a control method thereof.

  Communication equipment and data processing and storage equipment used in communication buildings and data centers are generally required to have high reliability. Therefore, for DC power supply devices that supply DC power to these load equipment, a storage battery is used as a backup power supply. A power supply method is used that can continue to supply power even when the DC power supply device fails or when the commercial power source used as an input is abnormal.

  In addition, the DC power supply device is usually configured by connecting a plurality of rectifier units in parallel to the load, and one or a plurality of extra rectifier units for the load current required by the load facility. May be connected and operated to maintain reliability (see, for example, Patent Document 1). In this case, in many cases, each rectifier unit supplies the load current to the load facility and the rectifier units connected in parallel and uniformly distributed. For example, when the load current flowing through the load facility is 100 A (amperes) and five rectifier units are provided in parallel, each rectifier unit supplies the load current by 20 A.

  FIG. 1 is a diagram illustrating a configuration of a DC power supply device having a storage battery. In FIG. 1, a commercial power source 100 is a power source supplied from a power company distribution system. The DC power supply device 1 is a power converter that receives AC power (for example, three-phase AC), converts it into DC power, and outputs it. The load facility 200 is an electric device or an electronic device that operates with DC power. The storage battery 3 is a power storage element such as a secondary battery. With the above configuration, when the power supply from the commercial power source 100 is stopped and the DC power supply 1 is stopped, the DC power supply 1 is supplied to the load facility 200 from the storage battery 3, thereby making the DC power supply 1 uninterruptible power supply. To improve the reliability as a power supply device.

JP 2007-318949 A

  By the way, when the power supply device charges the storage battery 3 with the system configuration as shown in FIG. 1, the charging current of the storage battery 3 is determined from the relationship between the output power capacity of the DC power supply device 1 and the input power of the load facility 200. For example, when the load facility 200 subordinate to the large-capacity DC power supply device 1 has very small input power, most of the output power of the DC power supply device 1 is consumed for charging the storage battery 3. As a result, each storage battery is charged with a current exceeding the limit value of the charging current value determined from the viewpoint of maintaining the life, for example, 0.1 CA, and the storage battery is deteriorated (shortened life). . The CA of 0.1 CA is a unit indicating the discharge rate of the storage battery, and 0.1 CA indicates the same value as the discharge current of 10 hour rate discharge.

  That is, the discharge current value and the charge current value allowed by the storage battery 3 are limited, and the discharge current value and the charge current value are generally larger than the charge current value. For example, in the case of a control valve type lead-acid battery, the discharge current value may be 3 CA, the charge current value may be 0.1 CA, and the discharge current value may be 30 times larger than the charge current value.

  For this reason, as shown in FIG. 2, a system configuration using a dedicated charger 300 and a diode (diode rectifier) Dt is used. The charger 300 is a dedicated DC power supply device for charging the storage battery 3, and the diode Dt is an element that passes power only from the anode side to the cathode side, and is a commercial power source (AC power source) 100 such as a power failure. When the DC power supply 1 is stopped due to the above problem, electric power is supplied from the storage battery 3 to the load facility 200 through the diode Dt.

  However, in the system configuration shown in FIG. 2, the charger 300 generally has a small output power during normal time (at the time of storage battery floating charging), but the power converter is operated at a light load. This is not preferable from the viewpoint of economy and loss reduction. That is, when the storage battery 3 is in a floating charge state, it becomes a state close to a no-load operation in which the charger 300 hardly outputs, the facility utilization rate is poor, and a state in which a fixed loss due to the charger operation occurs continues for a long time. To do. Further, if power is always supplied from the charger 300 to the load facility 200, there is a problem that a power loss having a value obtained by multiplying the forward voltage drop by the diode Dt by the passing current always occurs.

  The present invention has been made in view of such circumstances, and an object of the present invention is to shorten the life of a storage battery by charging in a DC power supply device including a rectifier unit that converts AC power into DC power and a storage battery. To provide a direct current power supply device and a control method thereof that can suppress the occurrence (improvement of reliability), improve the economy by eliminating the need for a dedicated charger, and reduce power loss It is in.

  The present invention has been made to solve the above problems, and a DC power supply apparatus according to the present invention includes a rectifier unit that inputs AC power from a commercial power source and outputs DC power to a load facility. A DC power supply device connected to a storage battery that supplies DC power to the load facility when power supply from a commercial power source is stopped, and the output voltage of the rectifier unit is within a range in which the load facility can operate. An output voltage control unit that performs constant voltage control so as to be a predetermined voltage, and a charging current control unit that performs constant current control so that the charging current flowing from the rectifier unit to the storage battery has a predetermined magnitude, When charging a storage battery with a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit is suspended, and the charging current control unit supplies a constant current to the storage battery. Charging, characterized in that.

  In addition, the DC power supply device of the present invention includes an output voltage detection circuit that detects a DC voltage output from the rectifier unit, a charging current detection circuit that detects a charging current flowing from the rectifier unit to the storage battery, and the output voltage. An output voltage control unit that performs constant voltage control on the output voltage of the rectifier unit by comparing a signal generated by the DC voltage detected by the detection circuit with a predetermined reference signal, and the charge detected by the charge current detection circuit A charging current control unit configured to perform constant current control on a charging current flowing from the rectifier unit to the storage battery by comparing a signal generated by the current with a predetermined reference signal, and charging the storage battery with a predetermined magnitude When charging with current flowing, the constant voltage control operation by the output voltage control unit is suspended, and the charge current control unit Performing constant current charging to the storage battery, characterized in that.

  Further, the DC power supply device of the present invention, when the charging voltage of the storage battery rises to a predetermined voltage or more, pauses the constant current control operation by the charging current control unit, and controls the constant voltage by the output voltage control unit. The operation is started.

  Further, the DC power supply device of the present invention includes a plurality of rectifier units connected in parallel to input AC power from a commercial power source and output DC power to a load facility, and power from the commercial power source A DC power supply apparatus connected to a storage battery that supplies DC power to the load equipment when supply is stopped, and is provided for each rectifier unit within a range in which the load equipment can operate the output voltage. An output voltage control unit that performs constant voltage control to a predetermined voltage, and a charging current control unit that performs constant current control so that the charging current flowing from each of the rectifier units to the storage battery has a predetermined magnitude, When charging the storage battery with a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit in each rectifier unit is suspended, and the charging battery The control unit, the to perform constant current charging from each of the rectifiers unit to the storage battery, characterized in that.

  The DC power supply device of the present invention includes an output voltage detection circuit that is provided for each rectifier unit and detects an output voltage of the rectifier unit, and a charging current detection that detects a charging current flowing from the DC power supply device to the storage battery. A circuit and a signal generated by a direct current voltage detected by the output voltage detection circuit corresponding to the rectifier unit provided for each of the rectifier units, by comparing with a predetermined reference signal, the output of the rectifier unit An output voltage control unit that controls the voltage at a constant voltage and a signal generated by the charging current detected by the charging current detection circuit are compared with a predetermined reference signal, thereby flowing from each of the rectifier units to the storage battery. A charging current control unit for controlling the charging current at a constant current, and charging the storage battery with a predetermined charging current. When charging, the constant voltage control operation by the output voltage control unit in each rectifier unit is suspended, and the charge current control unit causes each storage battery to perform constant current charging by the charge current control unit. It is characterized by that.

  In addition, the DC power supply device of the present invention stops the constant current control operation by the charging current control unit and controls the output voltage in each rectifier unit when the charging voltage of the storage battery rises above a predetermined voltage. The constant voltage control operation by the unit is started.

  The DC power supply device control method of the present invention includes a rectifier unit that inputs AC power from a commercial power source and outputs DC power to a load facility, and also when power supply from the commercial power source is stopped. A control method for a DC power supply apparatus in which a storage battery for supplying DC power to the load equipment is connected, wherein the output voltage of the rectifier unit is set to a predetermined voltage within a range in which the load equipment can operate. An output voltage control procedure for performing constant voltage control, and a charge current control procedure for performing constant current control so that a charging current flowing from the rectifier unit to the storage battery has a predetermined magnitude, and charging the storage battery to a predetermined magnitude When charging by supplying a current, the constant voltage control operation by the output voltage control procedure is suspended, and the storage battery is charged by the constant current by the charge current control procedure. And features.

  In addition, the control method for a DC power supply device of the present invention includes a plurality of rectifier units connected in parallel to input AC power from a commercial power source and output DC power to a load facility, and the commercial power source A control method for a DC power supply device in which a storage battery for supplying DC power to the load equipment is connected when the power supply from is stopped, wherein the load equipment can operate its own output voltage in each of the rectifier units. Output voltage control procedure for performing constant voltage control so as to be a predetermined voltage within a certain range, and charging current control for performing constant current control so that the charging current flowing from each of the rectifier units to the storage battery has a predetermined magnitude And when charging the storage battery with a charging current of a predetermined magnitude, according to the output voltage control procedure in each rectifier unit Rested voltage control operation, the so said the charging current control procedure from each of the rectifiers units perform constant current charging to the storage battery, characterized in that.

The direct current power supply device of the present invention includes an output voltage control unit for controlling the output voltage of the rectifier unit at a constant voltage, and a charging current control unit for controlling the output current of the rectifier unit at a constant current. When charging is performed by flowing a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit is suspended, and the storage battery is subjected to constant current charging by the charging current control unit.
Thereby, since it can charge with a constant current with respect to a storage battery, it can suppress that a storage battery lifetime is shortened by charge. In addition, a dedicated charger is not required, improving economic efficiency and reducing power loss.

Further, in the DC power supply device of the present invention, the output voltage of the rectifier unit is controlled at a constant voltage by comparing the voltage signal output from the output voltage detection circuit and the reference signal, and the rectifier unit A charging current control unit that controls an output current by comparing a current signal output from a charging current detection circuit with a reference signal, and charging the storage battery by flowing a charging current of a predetermined magnitude. At this time, the constant voltage control operation by the output voltage control unit is suspended, and the charging current control unit performs constant current charging to the storage battery.
Thereby, since it can charge with a constant current with respect to a storage battery, it can suppress that a storage battery lifetime is shortened by charge. In addition, a dedicated charger is not required, improving economic efficiency and reducing power loss.

Further, in the DC power supply device of the present invention, when the charging voltage of the storage battery rises to a predetermined voltage or higher, the current control operation by the charging current control unit is suspended and the constant voltage control operation by the output voltage control unit is started. Let
Thus, constant current charging (CC charging) can be performed during initial charging of the storage battery, and constant voltage charging (CV charging) can be performed after the storage battery is charged to some extent and reaches a predetermined voltage.

  Further, in the DC power supply device of the present invention, the DC power supply device includes a plurality of rectifier units connected in parallel, an output voltage control unit that performs constant voltage control on the output voltage of each rectifier unit, and from each rectifier unit to a storage battery. A charging current control unit that performs constant current control of the flowing output current. Then, when charging is performed by supplying a charging current of a predetermined magnitude to the storage battery, the constant voltage control operation in each rectifier unit is suspended, and constant current control of the charging current flowing from each rectifier unit to the storage battery is performed.

  Thereby, in the DC power supply device having a plurality of rectifier units, each rectifier unit can be charged with a constant current from the rectifier unit, so that it is possible to prevent the battery life from being shortened by charging. In addition, a dedicated charger is not required, improving economic efficiency and reducing power loss.

It is a figure which shows the structure of the direct-current power supply device which has a storage battery. It is a figure which shows the structural example of a DC power supply device provided with a dedicated charger. It is a figure for demonstrating the charging current characteristic to the storage battery in the DC power supply device of this invention. It is a figure which shows the structure of the direct-current power supply device concerning the 1st Embodiment of this invention. 3 is a diagram illustrating a configuration example of an output voltage control unit 23. FIG. 3 is a diagram illustrating a configuration example of a PWM control unit 22. FIG. 3 is a diagram illustrating a configuration example of a charging current control unit 24. FIG. It is a figure which shows the structure of the DC power supply device concerning the 2nd Embodiment of this invention. It is a figure which shows the structural example of 24 A of charging current control parts in 2nd Embodiment. It is a figure which shows the structure of the direct-current power supply device concerning the 3rd Embodiment of this invention. It is a figure which shows the structural example of output voltage control part 23 'and charging current control part 24' in 3rd Embodiment. It is a flowchart which shows the flow of a process of output voltage control part 23 'in 3rd Embodiment. It is a flowchart which shows the flow of a process of charge current control part 24 'in 3rd Embodiment. It is a flowchart which shows the flow of a process of the comparison part in 3rd Embodiment. It is a figure which shows the structure of the DC power supply device concerning the 4th Embodiment of this invention. It is a figure which shows the structural example of charging current control part 24A 'in 4th Embodiment. It is a flowchart which shows the flow of a process of charge current control part 24A 'in 4th Embodiment. It is a figure for supplementary explanation about a direct-current power supply device which has a plurality of rectifier units.

<First Embodiment>
Hereinafter, the DC power supply device according to the first embodiment of the present invention will be described with reference to the drawings.

  The basic configuration of the DC power supply device of the present invention is the same as that of the DC power supply device shown in FIG. In the DC power supply device of the present invention, the charging current detection circuit 4 measures the charging current of the storage battery 3 and controls the DC power supply device 1 so that the charging current of the storage battery 3 does not exceed a preset value (output current). -Droop control of output voltage characteristics). That is, a current limit (current limit) is performed based on a predetermined overcurrent protection set value. Moreover, when the DC power supply device 1 is composed of a plurality of rectifier units, the plurality of rectifier units are configured to be controlled to drop evenly.

  Moreover, FIG. 3 is a figure for demonstrating the charging current characteristic to the storage battery in the DC power supply device of this invention. FIG. 3A is a diagram showing “charging current-voltage characteristics” for the storage battery. As shown in FIG. 3 (A), when charging the storage battery, constant current charging (CC charging) is performed until the storage battery voltage reaches a predetermined value (Vnom) from the initial stage of charging. After charging to a predetermined voltage value (Vnom) or higher, the so-called constant current constant voltage is switched to constant voltage charging (CV charging) for controlling the voltage value supplied to a predetermined load device to be constant. Charging is performed.

  FIG. 3B is a diagram showing “current-voltage characteristics” of the DC power supply device of the present invention. As shown in FIG. 3 (B), the DC power supply device 1 performs constant voltage control (voltage Vnom constant) from no load to the overcurrent protection set value (Ioc), but the output current is a predetermined value, That is, when the overpower protection set value (Ioc) is exceeded, the constant current droop (the output voltage is lowered by the current limiting operation) is set by the overpower protection set value (Ioc).

  When performing constant current charging (CC charging) in FIG. 3A, the current limiting action (constant current drooping characteristic) shown in FIG. The constant current charging is performed so that a limit value, that is, a current value determined in advance as a standard value corresponding to the storage battery is obtained. That is, it is configured to perform constant current charging (CC charging) for the storage battery 3 by using the current limiting operation of the output current based on the overpower protection setting value (Ioc).

  FIG. 4 is a diagram illustrating a configuration example of the DC power supply device according to the first embodiment of the present invention. The example shown in FIG. 4 is an example when the number of rectifier units 2 is one (single). In the description of the first embodiment shown in FIG. 4, a control method using an analog circuit using an operational amplifier, a comparator (comparator), etc. will be described as a control means for realizing the function of the DC power supply device. (The same applies to the second embodiment). In the third and fourth embodiments to be described later, the same thing is realized by digital control using a computer system (including a microcomputer, a DSP (Digital Signal Processor), etc. and software). An example will be described.

  As shown in FIG. 4, the DC power supply device 1 of the present invention includes a rectifier unit 2 and a charging current detection circuit 4, and the rectifier unit 2 includes an output voltage detection circuit 5, a power conversion circuit 21, and PWM control. Unit 22, output voltage control unit 23, charging current control unit 24, diode D <b> 1, and diode D <b> 2.

  The rectifier unit 2 is provided between the commercial grid power source 100 and the load facility 200, an input terminal is connected to the commercial grid power source 100, and an output terminal C is connected to the load facility 200 and the storage battery 3. The charging current detection circuit 4 detects a charging current output from the output terminal C to the storage battery 3 and outputs a current signal Vis obtained by converting the charging current value into a voltage signal to the charging current control unit 2.

  The output voltage detection circuit 5 is connected to the input side of the output voltage control circuit 23, and the output side is connected to the anode side of the diode D1. Further, the charging current detection circuit 4 is connected to the input side of the charging current control unit 24, and the output side thereof is connected to the anode side of the diode D2. The cathode sides of the diodes D1 and D2 are connected in common at the connection point D, and the connection point D is connected to the terminal E on the input side of the PWM control unit 22. The output side of the PWM control unit 22 is connected to the input terminal B of the power conversion circuit 21.

  The power conversion circuit 21 in the rectifier unit 2 has an input side connected to the commercial grid power source 100, an output terminal A connected to the load facility 200 and the storage battery 3 through the terminal C, and a PWM control unit 22 connected to the input terminal B. Is connected. The output voltage detection circuit 5 is connected to the output side of the power conversion circuit 21.

  The power conversion circuit 21 converts, for example, an AC voltage into a DC voltage by a three-phase full bridge conversion circuit (not shown) constituted by a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or the like, and also a MOSFET or the like. In this case, a drive pulse (pulse signal whose duty ratio is controlled) output from the PWM control unit 22 is output from the rectifier unit 2. It is connected to a DC-DC converter that controls the voltage level of the direct current power. That is, the DC-DC conversion unit in the power conversion circuit 21 is based on the duty ratio of the drive pulse output from the PWM control unit 22 (ratio between the “H” level period and the “L” level period in one cycle of the pulse). The input DC voltage is converted into DC power corresponding to the duty ratio and having a stable voltage value.

(Description of constant voltage control operation in the rectifier unit 2)
As described above, the DC power supply device 1 of the present invention has an output voltage control function for controlling the DC output voltage to be constant, and a current control function for charging the storage battery 3 with constant current. In a normal state (a state in which the storage battery 3 is not charged with a constant current), a constant voltage control operation for controlling the output voltage of the DC power supply device 1 to be constant is performed by the output voltage control unit 23.

  Hereinafter, a constant voltage control operation for controlling the DC output voltage to be constant will be described. For this constant voltage control, an output voltage detection circuit 5 for detecting a DC output voltage output from the power conversion circuit 21 is connected to the output side of the power conversion circuit 21.

  FIG. 5 shows a configuration example of the output voltage control unit 23. As shown in FIG. 5, the output voltage control circuit 23 includes an output voltage control reference voltage generation circuit 23a, an adder 23b, and an amplifier 23c. One input side (+ side) of the adder 23b is connected to an output voltage control reference voltage generation circuit 23a, and a reference voltage value Vvref (voltage for controlling the output voltage of the rectifier unit to a preset voltage value) is Entered. The other input side (− side) of the adder 23 b is connected to the output voltage detection circuit 5, and a signal Vvs (voltage feedback signal) is input from the output voltage detection circuit 5. An amplifier 23c is connected to the output side of the adder 23b, and the output side of the amplifier 23c is connected to the anode side of the diode D1.

  In the above configuration, the adder 23b compares the reference voltage Vvref output from the output voltage control reference voltage generation circuit 23a with the signal Vvs output from the output voltage detection circuit 5, and the difference signal (Vvref−Vvs). ) And the difference signal (Vvref−Vvs) is amplified by an amplifier 23c having a gain Kv to generate an output voltage command signal V2. This signal V1 is output to the PWM controller 22 via the diode D1.

  FIG. 6 shows a configuration example of the PWM control unit 22. As shown in FIG. 6, the PWM control unit 22 includes a comparator 22a, an inverter 22b, a drive circuit 22c, and a triangular wave generation circuit 22d. The cathode side of the diodes D1 and D2 is connected to the non-inverting input terminal (+) of the comparator 22a, and the signal V1 or V2 is input through the diode D1. Further, a triangular wave generation circuit 22d is connected to the inverting input terminal (−), and a triangular wave signal output from the triangular wave generation circuit 22d is input. In addition, an inverter 22b is connected to the output side of the comparator 22a, an output side of the inverter 22b is connected to the drive circuit 22c, and the drive circuit 22c is connected to the power conversion circuit 21.

  In the configuration of the PWM control unit 22, the comparator 22a compares the voltage value of the signal V1 input through the diode D1 with the voltage value of the triangular wave output from the triangular wave generation circuit 22d in the constant voltage control state. A pulse having a time width of the voltage value of the triangular wave exceeding V1 as “L” level and a time width of the voltage value of the triangular wave less than the voltage value of the signal V1 as “H” level is output. This pulse is logically inverted by the inverter 22b connected to the output side of the comparator 22a, the time width of the voltage value of the triangular wave exceeding the signal V1 is set to “H” level, and the voltage value of the triangular wave less than the voltage value of the signal 1 is set. A pulse having a time width of “L” is output to the drive circuit 22c.

  The drive circuit 22 c generates a drive pulse for driving the semiconductor element in the power conversion circuit 21 from the pulse signal input from the inverter 22 b and outputs the drive pulse to the power conversion circuit 21. In the duty (duty ratio) of the input drive pulse, the power conversion circuit 21 increases the voltage value of the output voltage as the “H” level period becomes longer.

  That is, the PWM control unit 22 determines that the voltage value of the preset output voltage is output if the detection voltage signal Vvs output from the output voltage detection circuit 5 is higher than the reference voltage Vvref. The period of the “H” level of the drive pulse is shortened. In this way, the voltage output from the power conversion circuit 21 is controlled to be constant by the output voltage control unit 23 in a normal state (a state where the storage battery 3 is not charged with constant current).

  In the constant voltage control state, since the charging current from the DC power supply device 1 to the storage battery 3 is extremely small, the charging current control unit 24 shown in FIG. 7 uses the current signal Vis output from the charging current detection circuit 4. The voltage is very close to zero. As a result, the output of the charging current control unit 24 is at a low level (for example, the reference ground potential), and the diode D2 is turned off. Therefore, the PWM control unit 22 is not controlled by the charging current control unit 24 in the normal state.

  As described above, in a normal state where the charging current supplied from the DC power supply device 1 to the storage battery 3 is small, the output voltage control unit 23 operates, the charging current control unit 24 pauses, and the output voltage of the power conversion circuit 21 Are controlled at a constant voltage (for example, controlled at a constant voltage Vnom shown in FIG. 3B).

  That is, in the constant voltage control state, the output voltage control unit 23 compares the voltage detection signal Vvs from the output voltage detection circuit 5 with the reference voltage signal Vvref by the adder 23b, and the difference signal “Vvref−Vvs”. And an output voltage command signal V1 is generated by an amplifier 23c having a gain Kv, and this signal V1 is input to the PWM controller 22 via a diode D1. As a result, the output voltage from the power conversion circuit 21 is controlled to a value corresponding to the reference voltage signal Vvref.

(Description of constant current charging operation to the storage battery 3)
As described above with reference to FIG. 3A, when the DC power supply device 1 is operated in a state where the storage battery 3 is discharged, the storage battery 3 is charged with constant current. For this purpose, a charging current detection circuit 4 for detecting the value of the charging current to the storage battery 3 is provided between the rectifier unit 2 and the storage battery 3. The charging current detection circuit 4 is a current sensor for detecting (measuring) the charging current flowing from the rectifier unit 2 to the storage battery 3. For example, a Hall element or a shunt resistor may be used.

FIG. 7 is a diagram illustrating a configuration example of the charging current control unit 24.
As shown in FIG. 7, the charging current control unit 24 includes a current control reference voltage generation circuit 24a, resistors R11 and R12, a comparator (comparator) 24b, and an amplifier (Kc) 24c.

  In the charging current control unit 24 shown in FIG. 7, the positive (+) side of the current signal Vis output from the charging current detection circuit 4 is the negative (−) side of the reference voltage value Viref in the current control reference voltage generation circuit 24a. Also, the positive (+) side of the signal Vis is connected to the non-inverting input terminal (+) of the comparator 24b. Also, a series circuit of resistors R11 and R12 is connected between the positive (+) side of the reference voltage value Viref and the negative (−) side of the signal Vis. The connection point Q between the resistors R11 and R12 is connected to the inverting input terminal (−) of the comparison circuit 24b. An amplifier (Kc) 24c is connected to the output side of the comparison circuit 24b, and the output side of the amplifier 24c is connected to the anode side of the diode D2.

  In the above configuration, the charging current detection circuit 4 detects the charging current flowing from the DC power supply device 1 to the storage battery 3 and outputs it as a current signal Vis to the charging current control unit 24. During normal operation (when the battery 3 is not charged with constant current), the charging current from the DC power supply 1 to the storage battery 3 is extremely small, so the output voltage (signal Vis) from the charging current detection circuit 4 is very close to zero. As a result, the output of the charging current control unit 24 becomes “L” level (for example, the reference ground potential), and the diode D2 is turned off. Therefore, the PWM control unit 22 is not controlled by the charging current control unit 24.

  On the other hand, when the storage battery 3 is charged, a charging current from the DC power supply device 1 to the storage battery 3 is generated. In the circuit shown in FIG. 7, for example, if the resistance values of the resistors R11 and R12 are the same, the voltage level of the current signal Vis output from the charging current detection circuit 4 is previously set in the current control reference voltage generation circuit 24a. When the set reference value (Viref) is reached, the output of the comparator 24b becomes “H” level (for example, the power supply voltage level of the comparator), and the output of the comparator 24b is multiplied by an arbitrary gain coefficient Kc of the amplifier 25c. Is output to the diode D2. In this state, the diode D2 is turned on, whereas the diode D1 is turned off, and the PWM control unit 22 is controlled by the charging current control unit 24. As a result, constant current drooping control is effective.

  That is, the charging current flowing from the DC power supply device 1 to the storage battery 3 by the control operation of the charging current control unit 24 is a constant current determined according to the current control reference voltage Viref in the current control reference voltage generation circuit 24a. It is controlled to become.

Although the first embodiment of the present invention has been described above, the DC power supply device 1 of the present invention shown in FIG. 4 is a rectifier that inputs AC power from the commercial power source 100 and outputs DC power to the load facility 200. A DC power supply device 1 that includes a unit 2 and is connected to a storage battery 3 that supplies DC power to the load facility 200 when power supply from the commercial power source 100 is stopped, and is output from the rectifier unit 2 An output voltage detection circuit 5 for detecting a voltage, a charging current detection circuit 4 for detecting a charging current flowing from the DC power supply device 1 to the storage battery 3, and a signal Vvs generated by the DC voltage detected by the output voltage detection circuit 5 It is detected by the output voltage control unit 23 that controls the output voltage of the rectifier unit 2 by constant voltage by comparing with the predetermined reference signal Vvref and the charging current detection circuit 4. A charging current control unit 24 that performs constant current control on the charging current flowing from the rectifier unit 2 to the storage battery 3 by comparing the signal Vis generated by the charging current with a predetermined reference signal Viref. When charging is performed by supplying a charging current of a magnitude, the constant voltage control operation by the output voltage control unit 23 is suspended, and the storage battery 3 is charged by the charging current control unit 24 by constant current charging.
Thereby, since it can charge with a constant current with respect to a storage battery, it can suppress that a storage battery lifetime is shortened by charge. In addition, a dedicated charger is not required, improving economic efficiency and reducing power loss.

<Second Embodiment>
In the first embodiment described above, the case where there is one rectifier unit 2 in the DC power supply device 1 has been described. However, as the second embodiment of the present invention, the DC power supply device 1 includes a plurality of rectifiers. An example composed of units will be described.

  FIG. 8 is a diagram showing a configuration of a DC power supply apparatus according to the second embodiment of the present invention. In the example shown in FIG. 8, a configuration example in which arbitrary n rectifier units 2-1 to 2-n are connected in parallel is shown.

  The rectifier units 2-1 to 2-n shown in FIG. 8 are structurally different from the rectifier unit 2 shown in FIG. 4 in the rectifier units 2-1 to 2-n for the charging current control unit 24A. The resistors 27-1 to 27-n are added, and the charging current control unit 24A is commonly used in the rectifier units 2-1 to 2-n. Other configurations are the same as those of the rectifier unit 2 shown in FIG. For this reason, the same code | symbol (however, the identification code | symbol of rectifier unit 2-1 to 2-n is added) is attached to the same component part, and the overlapping description is abbreviate | omitted.

  In FIG. 8, each of the rectifier unit 2-1 to the rectifier unit 2-n is provided in parallel between the commercial power source 100 and the load facility 200 (and the storage battery 3), and each input is a commercial power source. 100, and the output terminals C-1 and Cn are commonly connected at the connection point H.

  The charging current detection circuit 4 is provided between the connection point H and the storage battery 3. The charging current detection circuit 4 measures the charging current flowing through the storage battery 3 and outputs the measured charging current signal Vis to the charging current control unit 24A.

  FIG. 9 shows the configuration of the charging current control unit 24A. The charging current control unit 24A shown in FIG. 9 is structurally different from the charging current control unit 24 in the first embodiment shown in FIG. 7 in that the charging current control unit 24 shown in FIG. The difference is that the insertion force terminals (1) and (1) ′ are newly added with a resistance (R) 24d for a voltage dividing circuit. Further, the difference is that the signal V2 output from the amplifier 24c is commonly supplied to the diodes D2-1 to D2-n in the rectifier units 2-1 to 2-n (see FIG. 8). Other configurations are the same as those of the charging current control unit 24 shown in FIG. For this reason, the same code | symbol is attached | subjected to the same component and the overlapping description is abbreviate | omitted.

  In the charging current control unit 24A shown in FIG. 9, the resistance insertion force terminal (1) is connected to the output side of the comparator 24b, and the resistance insertion force terminal (1) ′ is connected to one end of the resistor (R) 24d. , Connected to the input side of the amplifier 24c. The other end of the resistor (R) 24d is connected to the ground potential.

  In the configuration of the charging current control unit 24A, the resistor 27-1 is a resistor provided in the rectifier unit 2-1, and the resistor 27-n is a resistor provided in the rectifier unit 2-n. . The resistors 27-1 to 27-n are connected in parallel to the resistance insertion force terminals (1) and (1) ′ in the charging current control unit 24A.

  By changing the connection state of the resistors 27-1 to 27-n, the combined resistance value at the resistance insertion force terminals (1) and (1) ′ in the charging current control unit 24A changes. For example, when there are two rectifier units 2-1 and 2-2, the resistance values of the resistors 27-1 and 27-2 built in the rectifier units 2-1 and 2-2 are R '. When the number of rectifier units is one, the resistance value R ′ is changed. When the number of rectifier units is two, the resistance value R ′ / 2 is changed.

Here, if the output voltage of the comparator (comparator) 25b is Vin, the voltage of the output signal V2 of the amplifier 25c is as follows when there is one rectifier unit:
V2 = Vin × (R / R ′) × Kc,

If there are two rectifier units,
V2 = Vin × (2R / R ′) × Kc.

  In this way, the signal level of the signal Vin can be changed by changing the ratio of the combined resistance R ′ and the resistance (R) 24d. In the example shown in FIG. 9, when there are two rectifier units, the signal level is twice that when there is one rectifier unit. The charging current control unit 24A outputs a signal V2 obtained by multiplying the signal by an arbitrary coefficient Kc by the amplifier 25c to each rectifier unit (2-1, 2-2).

  As a result, the two rectifier units receive signals from the charging current control circuit 24A so as to control the drooping with a current value that is 1/2 that of a single rectifier unit (2-1, 2- 2), and thereby the two rectifier units (2-1, 2-2) are droop-controlled at a current value that is 1/2 that of a single rectifier unit.

Although the second embodiment of the present invention has been described above, the DC power supply device 1 shown in FIG. 8 is connected in parallel to input AC power from the commercial power source 100 and output DC power to the load facility 200. The DC power supply device 1 includes a plurality of rectifier units 2-1 to 2-n and is connected to a storage battery 3 that supplies DC power to the load facility 200 when power supply from the commercial power source 100 is stopped. Output voltage detection circuits 5-1 to 5-n that are provided for each rectifier unit 2-1 to 2-n and detect the output voltage of the rectifier unit, and the charging current flowing from the DC power supply device 1 to the storage battery 3 A charging current detection circuit 4 to detect and a signal Vv provided for each rectifier unit 2-1 to 2-n and generated by a DC voltage detected by an output voltage detection circuit corresponding to the rectifier unit. Is compared with a predetermined reference signal Vvref to generate output voltage control units 23-1 to 23-n for controlling the output voltage of the rectifier unit at a constant voltage and the charging current detected by the charging current detection circuit 4. A charging current control unit 24A that performs constant current control on the charging current flowing from each of the rectifier units 2-1 to 2-n by comparing the signal Vis with a predetermined reference signal Viref. When charging is performed by supplying a predetermined amount of charging current to the rectifier units, the constant voltage control operations by the output voltage control units 23-1 to 23-n in the rectifier units 2-1 to 2-n are suspended, and charging is performed. The current controller 24A charges the storage battery 3 with a constant current from each of the rectifier units 2-1 to 2-n.
Thereby, in the DC power supply device having a plurality of rectifier units, each rectifier unit can be charged with a constant current from the rectifier unit, so that it is possible to prevent the battery life from being shortened by charging. In addition, a dedicated charger is not required, improving economic efficiency and reducing power loss.

<Third Embodiment>
FIG. 10 is a diagram showing a configuration of a DC power supply device according to the third embodiment of the present invention.
The DC power supply device 1 according to the third embodiment shown in FIG. 10 is an example when the number of rectifier units 2 in the DC power supply device is one (single). The direct-current power supply device shown in FIG. 10 differs from the direct-current power supply device of the first embodiment shown in FIG. 4 in that the comparison unit 25 is provided instead of the diodes D1 and D2 shown in FIG. The difference is that the processing in the charging voltage control unit 23 ′, the charging current control unit 24 ′, and the comparison unit 25 is realized by a microcomputer, a DSP, or the like (including software describing the process of the processing). That is, this is an example in the case where the processing in the charging voltage control unit 23 ′, the charging current control unit 24 ′, and the comparison unit 25 is realized by digital control.

  Other configurations are the same as those of the DC power supply device shown in FIG. For this reason, the same code | symbol is attached | subjected to the same component.

  Hereinafter, in the third embodiment shown in FIG. 10, different parts from the first embodiment shown in FIG. 4, that is, the charging voltage control unit 23 ′, the charging current control unit 24 ′, and the comparison unit 25, The configuration and operation will be described.

  FIG. 11A shows the configuration of the output voltage control circuit 23 ′ in the third embodiment. FIG. 11B shows the configuration of the charging current control unit 24 ′ in the third embodiment.

(Description of output voltage control unit 23 ')
As shown in FIG. 11A, the output voltage control unit 23 ′ includes a storage unit 31 and an error calculation unit 32. The error calculation unit 32 is connected to the storage unit 31 and the output voltage detection circuit 5 on the input side, and to the comparison unit 25 on the output side. The error calculation unit 32 includes an A / D converter (not shown) that converts an analog signal into a digital signal, and a detection output from the output voltage detection circuit 5 by the A / D converter. The voltage signal Vvs is taken in as a digital signal (output voltage measurement value). Further, the comparison unit 25 has a D / A converter (not shown) that converts a digital signal into an analog signal, and the signal processed by the comparison unit 25 is converted into an analog signal by the D / A converter. And output to the PWM control unit 22.

  In the above configuration, the error calculation unit 32 derives a difference (Vvs−Vvref) between the voltage signal Vvs detected by the output voltage detection circuit 5 and the reference voltage value Vvref read from the storage unit 31, and an arbitrary coefficient is added to the difference. By multiplying K1, a voltage command signal V1 for constant voltage control is generated and output to the comparison unit 25.

  FIG. 12 is a flowchart showing the flow of processing in the output voltage control unit 23 ′. Hereinafter, the flow of processing in the output voltage control unit 23 ′ will be described with reference to FIG. First, the error calculation unit 32 reads the reference voltage value Vvref from the storage unit 31 (step S11). Further, the coefficient K1 is read from the storage unit 31 (step S12). Next, the error calculation unit 32 reads the voltage signal Vvs output from the output voltage detection circuit 5 (step S13), derives a difference (Vvs−Vvref) between the signal Vvs and the reference voltage value Vvref, and adds an arbitrary value to this difference. A voltage command signal V1 for constant voltage operation is generated by multiplying by the coefficient K1 (step S14) and output to the comparison unit 25 (step S15).

(Description of charging current control unit 24 ')
Next, the configuration and operation of the charging current control unit 24 ′ will be described.
As shown in FIG. 11B, the charging current control unit 24 ′ includes a storage unit 41 and an error calculation unit 42. The error calculation unit 42 has an input side connected to the storage unit 41 and the charging current detection circuit 4, and an output side connected to the comparison unit 25. The error calculation unit 42 includes an A / D converter (not shown) that converts an analog signal into a digital signal, and the current output from the charging current detection circuit 4 by the A / D converter. The signal Vis is captured as a digital signal (charge current measurement value).

  In the above configuration, the error calculation unit 42 in the charging current control unit 24 ′ compares the current signal Vis output from the charging current detection circuit 4 with the reference voltage value Viref read from the storage unit 41, and “Vis ≧ Viref”. In this case, a signal V2 for current droop control determined by an arbitrary coefficient K2 set in advance is generated and output to the comparison unit 25.

  Then, the comparison unit 25 shown in FIG. 10 outputs the signal V1 to the PWM control unit 22 when “V1 ≧ V2” and the signal V2 when “V1 <V2”. The PWM control unit 22 compares the signal output from the comparison unit 25 with the signal generated by the triangular wave generation circuit 22d, and generates a PWM signal for driving the power conversion circuit 21.

  FIG. 13 is a flowchart showing the flow of processing in the charging current control unit 24 ′. Hereinafter, the flow of the processing will be described with reference to FIG. In the charging current control unit 24 ′, first, the error calculation unit 42 reads the reference voltage value Viref serving as the reference signal of the charging current from the storage unit 41 (Step S 21), and the error calculation unit 42 receives the coefficient from the storage unit 41. K2 is read (step S22).

  Next, the error calculator 42 reads the current signal Vis output from the charging current detection circuit 4 (step S23), and compares the current signal Vis with the reference voltage value Viref (step S24).

  If “Vis ≧ Viref” (step S24: Yes), a signal V2 for current droop control determined by an arbitrary coefficient K2 set in advance is generated (step S25). On the other hand, if “Vis <Viref” (step S24: No), the signal V2 (V2 = 0) is generated (step S26). Then, the signal V2 generated in the error calculation unit 42 is output to the comparison unit 25 (step S27).

FIG. 14 is a flowchart showing the flow of processing in the comparison unit 25.
Referring to the flowchart shown in FIG. 14, the comparison unit 25 reads the signal V1 input from the output voltage control unit 23 ′ (step S31), and also reads the signal V2 input from the charging current control unit 24 ′. (Step S32).

  Subsequently, the comparison unit 25 compares the magnitude relationship between the voltage values of the signal V1 and the signal V2 (step S33). When “V1 ≧ V2” is satisfied (step S33: Yes), the signal V1 is output to the PWM control unit 22 (step S34). On the other hand, when “V1 <V2” (step S33: No), the signal V2 is output to the PWM control unit 22 (step S35).

  As described above, the comparison unit 25 compares the signal V1 input from the output voltage control unit 23 'with the signal V2 input from the charging current control unit 24', and outputs the signal V1 or The signal V2 is output. Thus, in a state where the charging current to the storage battery 3 is small, the signal V1 can be output to the PWM control unit 22 and the rectifier unit 2 can be controlled at a constant voltage. Moreover, when performing constant current charge to the storage battery 3, the signal V2 can be output with respect to the PWM control part 22, and the rectifier unit 2 can be controlled by constant current.

  In the above description, the processing in the PWM control unit 22 has been described on the premise that the processing is performed by an analog signal. However, the processing in the PWM control unit 22 can also be performed by digital control.

<Fourth embodiment>
FIG. 15 is a diagram showing a configuration of a DC power supply device according to the fourth embodiment of the present invention.
The DC power supply device according to the fourth embodiment shown in FIG. 15 corresponds to the DC power supply device of the third embodiment shown in FIG. 10, and a plurality of rectifier units in the DC power supply device (arbitrary In the case of n units), and the processing in the output voltage control units 23′-1 to 23′-n, the charging current control unit 24A ′, and the comparison units 25-1 to 25-n is performed by digital control. It is an example.

  In the fourth embodiment shown in FIG. 15, the rectifier units 2-1 to 2-n are structurally different from the rectifier units 2 shown in FIG. n is different in that the active signal sending units 28-1 to 28-n are added, and the charging current control unit 24A 'is commonly used in the rectifier units 2-1 to 2-n. . Other configurations are the same as those of the rectifier unit 2 shown in FIG. For this reason, the same code | symbol (However, the identification code according to the rectifier units 2-1 to 2-n is added) is attached to the same component.

  The active signal sending units 28-1 to 28-n are mounted on the rectifier units 2-1 to 2-n, and their output sides are input terminals (1) to (1) to ( n), respectively. The active signal transmission units 28-1 to 28-n are configured to transmit signals of two different levels (H (high) level) and L (low) level set in advance. Alternatively, it is configured to output signals in two different states (switch circuit and closed circuit).

  In the fourth embodiment shown in FIG. 15, description will be made assuming that the active signal sending units 28-1 to 28-n send signals of two different levels (H level and L level) set in advance. The rectifier units 2-1 to 2-n send out operating signals (for example, H level) while the self-unit is operating.

FIG. 16 is a diagram illustrating a configuration of the charging current control unit 24A ′ according to the fourth embodiment.
As shown in FIG. 16, in the charging current control unit 24A ′, the error calculation unit 42 ′ has a storage unit 41 on the input side and active signal sending units 28-1 to 28- of the rectifier units 2-1 to 2-n. n and the charging current detection circuit 4, and the output side is connected to the comparison units 25-1 to 25-n. Further, the error calculation unit 42 ′ has an A / D converter (not shown) that converts an analog signal into a digital signal, and is output from the charging current detection circuit 4 by this A / D converter. The current signal Vis is captured as a digital signal (charge current measurement value).

In the above configuration, the error calculation unit 42 'is the number of H level signals among the active signals A1 to An applied from the active signal sending units 28-1 to 28-n to the input terminals (1) to (n). Is counted as N _RF-U . Here, it is assumed that N of the rectifier units 2-1 to 2-n are operating.

When the current signal Vis (current measurement value) output from the charging current detection circuit 4 reaches the value Viref value read from the storage unit 41 in advance, the error calculation unit 42 ′ exceeds the reference voltage value Viref. In this case, a signal V2 indicating a value obtained by dividing the coefficient Kc by N _RF-U (= N) is output to the corresponding (operating) N units among the rectifier units 2-1 to 2-n. As a result, a signal is input to the N rectifier units so that the drooping control is performed with a current value of 1 / N when the number of rectifier units is one. In this case, the drooping control is performed with a current value of 1 / N.

  FIG. 17 is a diagram showing a flow of processing in the charging current control unit 24A ′ in the fourth embodiment, and shows processing in the above-described charging current control unit 24A ′ in a flowchart.

  Referring to FIG. 17, the error calculation unit 42 of the charging current control unit 24A ′ first reads the reference voltage value Viref from the storage unit 41 (step S41). Subsequently, the error calculation unit 42 ′ reads the coefficient K2 from the storage unit 41 (step S42).

Next, the error calculator 42 ′ reads the active signals A1 to An output from the active signal transmitters 28-1 to 28-n (step S43). Then, the sum of the number of H level signals among the active signals A1 to An is counted as _NRF-U (step S44).

  Subsequently, the error calculation unit 42 ′ reads the charge current detection value signal Vis from the charge current detection circuit 4 (step S45), and compares the charge current measurement value (signal Vis) with the reference voltage value Viref (step S46). ).

If “Vis ≧ Viref” (step S46: Yes), a signal V2 indicating a value obtained by dividing an arbitrary coefficient K2 set in advance by N _RF-U is generated. On the other hand, if “Vis <Viref” (step S46: No), the signal V2 (V2 = 0) is generated (step S48). Then, the signal V2 is output to the comparison units 25-1 to 25-n (step S49). The processing in the comparison units 25-1 to 25-n is the same as the processing in the flowchart shown in FIG.

  In addition, when the DC power supply device 1 is composed of a plurality of rectifier units 2-1 to 2-n, an example of selecting and operating a rectifier unit to be operated will be supplementarily described.

  As shown in FIG. 18, in the DC power supply device 1 having a plurality of rectifier units 2-1 to 2-n connected in parallel, each rectifier unit 2-1 to 2-n and a commercial power source (AC power supply). The switches (breakers) 6-1 to 6-n are arranged between the switch 100 and the controller 7 to select the switching states of the switches 6-1 to 6-n, and according to the supply of DC power to the load. The number of rectifier units 2-1 to 2-n to be operated may be controlled, and the rectifier unit may be operated with high power conversion efficiency to reduce power loss.

  Also in this case, it is possible to apply the technical idea of performing constant current charging on the storage battery 3 in the above-described DC power supply device of the present invention. In this case, the charging current for the storage battery 3 is controlled by the rectifier units 2-1 to 2-n operating at that time without performing the number control during charging of the storage battery 3.

  Although the embodiment of the present invention has been described above, the DC power supply 1 of the third embodiment shown in FIG. 10 and the DC power supply 1 of the fourth embodiment shown in FIG. As described above, a computer system using a microcomputer, a DSP, or the like is included. And about charging voltage control part 23 ', 23'-1-23'-n, charging current control part 24', 24A ', the comparison part 25, and other desired processing parts (for example, PWM control part 22) Further, it may be realized by dedicated hardware, and a program for realizing the function of each processing unit is recorded on a computer-readable recording medium, and the program recorded on the recording medium is recorded on the computer. The function may be realized by being read into the system and executed.

  Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  Although the embodiments of the present invention have been described above, the DC power supply apparatus of the present invention is not limited to the above-described illustrated examples, and various modifications can be made without departing from the scope of the present invention. Of course.

DESCRIPTION OF SYMBOLS 1 ... DC power supply device, 2,2-1,2-n ... Rectifier unit, 3 ... Storage battery, 4 ... Charging current detection circuit, 5,5-1,5-n ... Charge voltage detection circuit, 21, 21-1, 21-n... Power conversion circuit, 22, 22-1, 22-n .. PWM control unit, 22a... Comparator (comparator), 22b. Inverter, 22c... Drive circuit, 22d... Triangular wave generation circuit, 23, 23-1, 23-n, 23 ', 23'-1, 23'-n ... output voltage control unit, 23a. Reference voltage generation circuit for output voltage control, 23b ... adder, 23c ... amplifier, 24, 24 ', 24A, 24A' ... charging current control unit, 24a ... reference voltage generation for current control Circuit, 24b... Comparator, 24c... Amplifier, 24d. Resistance (R), 25 ... comparison unit, 27-1, 27-2 ... resistor, 100 ... commercial power source (AC power supply), 200 ... load equipment, 300 ... charger D1, D1-1, D1-n, D2, D2-1, D2-n, Dt... Diode

Claims (8)

A rectifier unit that inputs AC power from a commercial power source and outputs DC power to a load facility is provided, and a storage battery that supplies DC power to the load facility when power supply from the commercial power source is stopped is connected DC power supply
An output voltage control unit that performs constant voltage control so that the output voltage of the rectifier unit becomes a predetermined voltage within a range in which the load facility can operate;
A charging current controller that performs constant current control so that the charging current flowing from the rectifier unit to the storage battery has a predetermined magnitude;
With
When charging the storage battery with a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit is suspended, and the storage battery is subjected to constant current charging by the charging current control unit.
A direct current power supply device. An output voltage detection circuit for detecting a DC voltage output from the rectifier unit;
A charging current detection circuit for detecting a charging current flowing from the rectifier unit to the storage battery;
An output voltage control unit that performs constant voltage control on the output voltage of the rectifier unit by comparing a signal generated by the DC voltage detected by the output voltage detection circuit with a predetermined reference signal;
A charging current control unit that performs constant current control on a charging current flowing from the rectifier unit to the storage battery by comparing a signal generated by the charging current detected by the charging current detection circuit with a predetermined reference signal;
With
When charging the storage battery with a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit is suspended, and the storage battery is subjected to constant current charging by the charging current control unit.
The DC power supply device according to claim 1. When the charging voltage of the storage battery rises above a predetermined voltage,
While stopping the constant current control operation by the charging current control unit, start the constant voltage control operation by the output voltage control unit,
The DC power supply device according to claim 1 or 2, wherein A plurality of rectifier units connected in parallel to input AC power from a commercial power source and output DC power to the load facility, and DC power to the load facility when power supply from the commercial power source is stopped A direct current power supply device to which a storage battery is connected,
An output voltage control unit that is provided for each of the rectifier units and controls the output voltage of the rectifier units to a voltage determined within a range in which the load facility can operate;
A charging current controller that performs constant current control so that the charging current flowing from each of the rectifier units to the storage battery has a predetermined magnitude;
With
When charging the storage battery by flowing a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit in each rectifier unit is suspended, and the charging current control unit causes each of the rectifier units to Causing each of the storage batteries to perform a constant current charge,
A direct current power supply device. An output voltage detection circuit that is provided for each rectifier unit and detects an output voltage of the rectifier unit;
A charging current detection circuit for detecting a charging current flowing from the DC power supply device to the storage battery;
The output voltage of the rectifier unit is determined by comparing a signal generated by the DC voltage provided for each rectifier unit and detected by the output voltage detection circuit corresponding to the rectifier unit with a predetermined reference signal. An output voltage control unit for voltage control;
A charging current control unit configured to perform constant current control on a charging current flowing from each of the rectifier units to the storage battery by comparing a signal generated by the charging current detected by the charging current detection circuit with a predetermined reference signal; ,
With
When charging the storage battery by flowing a charging current of a predetermined magnitude, the constant voltage control operation by the output voltage control unit in each rectifier unit is suspended, and the charging current control unit causes each of the rectifier units to Causing each of the storage batteries to perform a constant current charge,
The direct-current power supply device according to claim 4. When the charging voltage of the storage battery rises above a predetermined voltage,
While stopping the constant current control operation by the charging current control unit, start the constant voltage control operation by the output voltage control unit in each rectifier unit,
The DC power supply device according to claim 4 or 5, wherein A rectifier unit that inputs AC power from a commercial power source and outputs DC power to a load facility is provided, and a storage battery that supplies DC power to the load facility when power supply from the commercial power source is stopped is connected A control method for a DC power supply
An output voltage control procedure for controlling the output voltage of the rectifier unit at a constant voltage so as to be a predetermined voltage within a range in which the load facility can operate;
A charging current control procedure for performing constant current control so that a charging current flowing from the rectifier unit to the storage battery has a predetermined magnitude;
Including
When charging by charging a predetermined amount of charging current to the storage battery, the constant voltage control operation by the output voltage control procedure is paused, and constant current charging is performed to the storage battery by the charging current control procedure.
A control method for a DC power supply device. A plurality of rectifier units connected in parallel to input AC power from a commercial power source and output DC power to the load facility, and DC power to the load facility when power supply from the commercial power source is stopped A control method of a DC power supply device to which a storage battery for supplying
An output voltage control procedure for controlling the output voltage of each of the rectifier units to be a predetermined voltage within a range in which the load facility can operate;
A charging current control procedure for performing constant current control so that the charging current flowing from each of the rectifier units to the storage battery has a predetermined magnitude;
Including
When charging the storage battery by flowing a charging current of a predetermined magnitude, the constant voltage control operation according to the output voltage control procedure in each rectifier unit is suspended, and each of the rectifier units according to the charging current control procedure. To make a constant current charge to the storage battery,
A control method for a DC power supply device.

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