JP2011030324A - Electric power unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure high reliability without causing any instantaneous power supply interruption by reducing the probability that respective systems break down simultaneously in electric power units in which power supply units are multiplexed. <P>SOLUTION: Each of a plurality of power supply units includes a voltage converter and a diode inserted between the voltage converter and a power supply line with power supply set in a forward direction. Voltage of the power supply unit to be supplied to equipment is variable. The electric power supply unit includes a control part for controlling a supply voltage of the plurality of power supply units. The control part performs control so that the supply voltage becomes higher than that of the power supply unit in the other standby systems with one power supply unit of the plurality of power supply units as a current system, and changes overs the power supply unit of the current system and that of the standby system at a preset timing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power supply device, and more particularly to a power supply device suitable for use in a device or system whose reliability is improved by having a power system in which power supplies are multiplexed.

  2. Description of the Related Art Conventionally, in a field such as a communication field or a digital processing device, a device that converts an AC power source into a DC power source and that has a dual power system is known in order to improve reliability.

First, the configuration of a power supply apparatus in which a power supply unit according to the related art is duplicated will be described with reference to FIG.
FIG. 4 is a configuration diagram of a power supply device in which a power supply unit according to the prior art is duplicated.

  Power (power) is input to the power supply apparatus 101 from the outside. The external power source is, for example, an AC 100V that is a commercial power source or a DC 48V from a storage battery.

  The power supply unit-A100 and the power supply unit-B200 convert the input voltage into a voltage (for example, DC 5V) used in the device. In order to multiplex power supply units, Schottky barrier diodes 120 and 220 are used as outputs of the power supply unit-A100 and power supply unit-B200, and reverse current flows to the output terminal of the voltage converter. To prevent that.

  Each power supply unit is always energized when the device is in operation. For example, even when the power supply unit-A100 stops outputting due to a failure or the like, the power supply unit-B200 supplies power in the device. In addition, the output voltage (output voltage -A / -B) of each power supply unit is adjusted in advance so as to be the same output voltage. Divided load distribution (output power-A = output power-B) is performed.

  Patent Document 1 discloses a technique for switching to a standby power source and notifying the management center of this when a power supply to a base station is stopped in a wireless communication system.

JP 2008-35430 A

  In the power supply apparatus 101 shown in FIG. 4 described above, reliability is improved by duplexing power supply systems in parallel.

  However, since the power supply method using the power supply apparatus 101 is not a duplication of the concept of the active unit and the standby unit, only the effect of improving the reliability by reducing the unit load on the power supply by load distribution can be expected. In general, a major factor in the life and performance deterioration of a voltage converter and a power supply unit is performance deterioration due to heat of components such as an electrolytic capacitor used in the power supply unit.

  In the prior art, since the loads of the respective power supply units are equal, the heat generation of the power supply units is almost equal between the power supply unit-A100 and the power supply unit-B200, and there is a possibility that a failure of the power supply unit occurs at the same time. Even if the power supply units are multiplexed, if a failure occurs at the same time, it does not contribute to the improvement of the reliability of the original device / system.

  Further, in the wireless communication system of Patent Document 1, when the current power supply stops, this is detected and switched to the standby power supply. Therefore, there is a risk of power interruption, and it is not suitable for devices and systems that require high reliability.

  The present invention has been made to solve the above problems, and its purpose is to reduce the probability that multiplexed power supply units will fail at the same time, and this can be implemented in a simple manner. An object of the present invention is to provide a power supply device having high reliability without instantaneous power interruption.

  In the power supply device of the present invention, there are a plurality of external power supply inputs, each of which is input to a plurality of power supply units, and the voltage of the power supply unit supplied to the device can be made variable.

  Each of the plurality of power supply units includes a voltage converter and a diode inserted between the voltage converter and the power supply line with the power supply direction as a forward direction.

  In addition, the power supply apparatus includes a control unit that controls supply voltages of the plurality of power supply units, and the control unit sets one power supply unit among the plurality of power supply units as an active system and another standby system. The power supply unit is controlled to be higher than the power supply unit, and the active power supply unit and the standby power supply unit are switched at a predetermined timing.

  According to the present invention, it is possible to reduce the probability that multiplexed power supply units will fail at the same time, and to implement a power supply apparatus that can be mounted in a simple manner and has high reliability without instantaneous power interruption. Can be provided.

It is a block diagram of the power supply device which concerns on 1st embodiment of this invention. It is a block diagram of the power supply device which concerns on 2nd embodiment of this invention. It is a timing chart which shows the timing of the power supply switching by the power supply device which concerns on 2nd embodiment of this invention. It is a block diagram of the power supply device which duplicated the power supply unit which concerns on a prior art.

  Embodiments according to the present invention will be described below with reference to FIGS. 1 to 3.

[Embodiment 1]
Hereinafter, a first embodiment according to the present invention will be described with reference to FIG.
FIG. 1 is a configuration diagram of a power supply device according to the first embodiment of the present invention.

  The power supply apparatus 1 of the present invention is a power supply apparatus for equipment that is generally considered to have a high failure rate in the field of communication equipment, information equipment, and industrial equipment that enables system operation even when a single equipment failure occurs. The present invention relates to a technique for improving the reliability of devices and systems by multiplexing. Therefore, the external power supply input system is duplexed as shown in FIG. 1, and the power supply unit is duplexed correspondingly as in the power supply device shown in the prior art.

  However, in this embodiment, unlike the conventional technique, the output voltages of the voltage conversion unit-A11 and the voltage conversion unit-B21 are set to be different. In the example, “output voltage-A> output voltage-B” is set, and the power supply unit-A10 is in the active state and the power supply unit-B20 is in the standby state, and is always energized.

  Since the Schottky barrier diodes 12 and 22 are used at the output terminals of the power supply unit-A10 and the power supply unit-B20, respectively, when the output voltage -AA from the power supply device is used, “output voltage-AA> output” The voltage −B ″, and the current −AA supplied from the power supply device into the device matches the current A from the power supply unit −A10, and the output power −B of the power supply unit −B20 is substantially equal to zero. .

  Since the power supply unit-B20 is in a standby state in the absence of a load, the amount of heat generation is less than that of the power supply unit-A10, so that the probability of failure is reduced and the life is also extended.

  Thus, by providing a difference in the normal load of the multiplexed power supply units, simultaneous failure of the duplicated power supply units can be prevented, and the reliability of the device and the system can be improved.

[Embodiment 2]
Hereinafter, a second embodiment according to the present invention will be described with reference to FIGS.
FIG. 2 is a configuration diagram of a power supply device according to the second embodiment of the present invention.
FIG. 3 is a timing chart showing the timing of power supply switching by the power supply device according to the second embodiment of the present invention.

  First, the configuration of the power supply device according to the second embodiment of the present invention will be described with reference to FIG.

  In the present embodiment, as in the first embodiment, the external power supply is duplicated and input to the power supply unit-A10 and the power supply unit-B20, respectively. In the present embodiment, the control circuit 2 is provided, and control signals for voltage control-A and voltage control-B are transmitted to the voltage converter-A11 and the voltage converter-B21, respectively. As a result, the output voltages of the voltage converter-A11 and the voltage converter-B21 change depending on the state of the signals input to them.

  Here, as an example, when the state of the voltage control signal is “1” in the logical expression, the voltage converter-A11 and the voltage converter-B21 output a working voltage, for example, 6.0V, When the expression is “0”, 5.0 V is output.

  Next, the timing of power supply switching will be described with reference to FIG.

Control circuit, at the time _{T 1} and _{T 1} ', changes the voltage control -A / -B. Voltage converter -B21 becomes the output voltage become the working almost _{T 1,} the voltage converter -A11 changes in voltage as a stand at approximately _{T 1} '.

The output current of each voltage converter changes according to the change in voltage. During the time between the times T ₁ and T ₁ ′, the voltage and current in the device are kept constant, so that both power supply units are simultaneously active.

Further, the control circuit, at time _{T 2} and _{T 2} ', changing the voltage control -A / -B, voltage converter -A11 becomes the output voltage become the working almost _{T 2,} the voltage converter -B21 is The voltage changes to a standby voltage at about T ₂ ′.

  By performing such control and periodically switching between the active and standby systems, it is possible to avoid concentrating the load on only one power supply unit over the long term, and to start a new operation by replacing the fault Management of whether the unit is in the active state or the standby state can be performed, and the reliability of the system can be further improved. For example, by setting the ratio between the active system and the standby system of the power supply unit-A10 and the power supply unit-B20 to 8: 2 or 7: 3 within one day, the probability of simultaneous failure can be reduced. At the same time, it is possible to prevent the load from concentrating only on the power supply unit-A10 and extremely shortening the service life.

  As described above, according to the present embodiment, devices and systems that use a multiplexed power supply configuration by providing a plurality of power supply units with active and standby states and further controlling the states. The reliability can be improved easily and inexpensively. Moreover, since it is always duplicated, there is no instantaneous interruption caused by switching of the power supply.

[Others]
The present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the case where two power supply units are provided has been described as an example. However, three or more power supply units may be used in the present invention.

  In the above-described embodiment, an example in which the Schottky barrier diodes 12 and 22 are provided at the output terminals of the power supply unit-A10 and the power supply unit-B20 has been described. However, the diode provided at the output terminal of the power supply unit in the present invention is not limited to the Schottky barrier diode.

  Further, in the above-described second embodiment, the case where the control circuit 2 periodically switches between the active system and the standby system has been described as an example. However, the present invention is not limited to this, and the control circuit 2 only needs to be configured to switch between the active system and the standby system at a predetermined timing, and as a result, the active system In order to avoid the failure of the power supply unit and the standby power supply unit at the same timing, the power supply unit and the standby power supply unit may be switched so as to have a difference in use time.

DESCRIPTION OF SYMBOLS 1 ... Power supply device, 2 ... Control circuit, 10 ... Power supply unit-A, 20 ... Power supply unit-B, 12 ... Schottky barrier diode, 22 ... Schottky barrier diode.
DESCRIPTION OF SYMBOLS 101 ... Power supply device, 100 ... Power supply unit-A, 200 ... Power supply unit-B, 120 ... Schottky barrier diode, 220 ... Schottky barrier diode.

Claims (1)

A plurality of power supply units connected to the device via a common power line, and the supply voltage to the device is variable;
In the power supply device having a control unit for controlling the supply voltage of the plurality of power supply units,
Each of the plurality of power supply units includes a voltage converter, and a diode inserted between the voltage converter and the power supply line with a power supply direction as a forward direction,
The control unit controls one power supply unit of the plurality of power supply units so that a supply voltage is higher than another power supply unit, and controls the one power supply unit having the highest supply voltage to the plurality of power supplies. A power supply device that switches at a predetermined timing in a unit.

Images