JP2012239287A - Ac/dc-input-compatible power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC/DC-input-compatible power supply device that implements a compact size and high efficiency by reducing the number of components used.SOLUTION: An input stage of a PFC circuit prepares a coil 1 having the number of turns optimized for 100-240 VAC and a coil 2 having the number of turns optimized for 48 VDC. When 48 VDC is applied to an input (IN), a switch (SW) 4 is operated to select the coil 2 for 48 VDC. When 100-240 VAC is applied to an input (IN), the switch (SW) 4 is operated to select the coil 1 for 100-240 VAC.

Description

  The present invention relates to an AC / DC input-compatible power supply device that can be fed from an AC power source and a DC power source.

  Wireless communication base stations include low-output and small-sized outdoor installation type base stations represented by PHS base stations, and high-output and large-sized base stations represented by mobile phone base stations. . However, the technology for downsizing mobile phone base stations, which have been large, is also progressing, and an outdoor installation type is being demanded from the standpoint of installation. In the case of an outdoor small base station, direct supply of commercial power is required so that power can be supplied from anywhere. On the other hand, DC power supply from a rectifier equipped with a battery backup is also required as a countermeasure against power outage in the event of a disaster.

  For this reason, as a power source required for the radio communication base station, a power supply circuit that can use a commercial power source of AC 100V and a DC-48V power source in common, and that considers downsizing required for a small base station has been proposed (patent) Reference 1).

  FIG. 1 is a block diagram of a general AC input power source, and FIG. 2 is a block diagram of a general DC input power source. The PFC (Power Factor Correction) output is a high-voltage DC voltage, but in the figure it is DC 400V. Further, as power output, 30 to 50 V and 5 to 12 V are prepared for power amplification (PA) and control, respectively, but power supply systems with other power supply systems and other voltage systems are also conceivable.

  When both AC input and DC input are supported, it is conceivable to prepare a base station lineup by preparing two AC input compatible power supply devices and DC input compatible power supply devices and replacing the power supply devices. . However, it is necessary to develop two types of base stations and to develop two types of power supply devices.

  Further, when one type of power supply apparatus supports both AC input and DC input, the following three types of power supply apparatuses are conceivable. The first is a power supply device to which a DC / DC circuit for creating DC-48V is added in the AC input conversion process for shared use with the DC-48V input, as shown in FIG. The second is a power supply device in which an inverter circuit is added to a DC-48V input for shared use with an AC input, as shown in FIG. The third is a power supply device to which a DC / DC circuit for boosting from DC-48V to DC400V is added for shared use with an AC input, as shown in FIG.

JP-A-11-332231

  However, any of the power supply apparatuses shown in FIGS. 3 to 5 has a problem in reducing the size of the base station because the number of parts (number of circuits) increases. Further, in the power supply device of FIG. 3, since the AC input passes through the three circuits of the PFC circuit and the two DC / DC circuits, the efficiency deteriorates due to power consumption. In the power supply device of FIG. 4, since the DC input passes through three circuits of an inverter circuit, a PFC circuit, and a DC / DC circuit, the efficiency deteriorates due to power consumption. In the case of an outdoor base station, heat dissipation is also a problem. If efficiency deteriorates and heat loss increases, a large fin (FIN) must be prepared to secure a heat dissipation area, which is contrary to the purpose of downsizing. It will be.

  The present invention has been made in view of such problems, and an object of the present invention is to reduce the number of parts to achieve downsizing and to improve the efficiency of the AC / DC input. The object is to provide a compatible power supply.

  In order to achieve the above object, the present invention is an AC / DC input-compatible power supply device including a PFC circuit and a DC / DC converter circuit, and includes a coil at an input stage of the PFC circuit, and is input to the PFC circuit. The number of turns of the coil can be selected according to the voltage to be applied.

  In the present invention, two coils having different winding numbers are provided in the input stage of the PFC circuit, and any one of the coils can be selected according to the voltage input to the PFC circuit. And

  Further, the two coils are coils on one side of the intermediate tap of the coil with the intermediate tap, the coil having the number of turns optimized for DC, and the entire coil of the intermediate tap coil, Preferably, the coil has an optimized number of turns for AC.

  Further, the present invention is a PFC circuit used in an AC / DC input-compatible power supply device, comprising a coil, wherein the number of turns of the coil can be selected according to a voltage input to the PFC circuit. .

  In the present invention, a coil is provided at the input stage of the PFC circuit so that the number of turns of the coil can be selected according to the voltage applied to the input of the PFC circuit, so that the number of parts can be reduced and the size can be reduced. It is possible to improve efficiency.

It is a block diagram of a general AC input power supply. It is a block diagram of a general DC input power supply. It is a figure which shows an example of the power supply device corresponding to both AC input and DC input. It is a figure which shows an example of the power supply device corresponding to both AC input and DC input. It is a figure which shows an example of the power supply device corresponding to both AC input and DC input. 1 is a block diagram of an AC / DC input-compatible power supply device according to an embodiment of the present invention. It is a block diagram which shows the general structural example of a PFC circuit. FIG. 3 is a block diagram illustrating a specific configuration example of a PFC circuit according to the first embodiment of the present invention. It is a block diagram which shows the specific structural example of the PFC circuit which concerns on the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram of an AC / DC input-compatible power supply device according to the embodiment of the present invention. An AC / DC input-compatible power supply device according to an embodiment of the present invention includes a PFC (Power Factor Correction) circuit for improving a power factor and a high-voltage input DC / DC converter circuit (hereinafter referred to as a DC / DC circuit). . Specifically, the PFC circuit is a combination of the DC / DC (boost) circuit and the PFC circuit of FIG. Since the PFC circuit is larger than the PFC circuit of FIG. 1 because it is a shared input, the power supply apparatus according to the embodiment of the present invention has two circuits, and the power supply apparatus of FIGS. Since the number of circuits is smaller than that of the power supply device shown in FIGS.

  FIG. 7 is a block diagram illustrating a general configuration example of the PFC circuit. The PFC circuit shown in FIG. 7 includes a coil 1, a switching element 6, a control circuit 7 that controls the switching element 6, a rectifier diode 8, and a capacitor 9. When AC100 to 240V is applied to the input (IN) of the PFC circuit, the voltage of AC100 to 240V is switched by the switching element 6, rectified by the rectifier diode 8, and boosted to DC400V.

  FIG. 8 is a block diagram showing a specific configuration example of the PFC circuit according to the first embodiment of the present invention. Considering that the input (IN) of FIG. 7 is not only AC100-240V but also DC-48V, it is not a problem that DC is supplied to the circuit itself, but it is necessary to widen the lower limit of the input range. is there.

  Therefore, as shown in FIG. 8, a coil 1 optimized for the number of turns for AC 100 to 240V, a coil 2 optimized for the number of turns for DC-48V, and a switch (SW) 4 are provided in the input stage. The coil 1 and the coil 2 can be selected by the switch (SW) 4 in accordance with the voltage applied to the input (IN).

  When DC-48V is applied to the input (IN), the switch (SW) 4 is switched to select the coil 2 with the number of turns optimized for the DC-48V, and AC 100 to 240V is applied to the input (IN). If given, the switch (SW) 4 is switched to select the coil 1 with the number of turns optimized for AC 100 to 240V.

  Thereby, an AC / DC input-compatible power source can be realized. The PFC circuit according to the first embodiment has the same configuration as the PFC circuit of FIG. 7 except that a DC-48V coil 2 and a switch (SW) 4 are added.

  Since the AC / DC input-compatible power supply device according to the first embodiment is simply the addition of the coil 2 and the switch (SW) 4 to the circuit of FIG. 7, the size and the efficiency are optimized by reducing the number of circuits. Can be achieved.

  FIG. 9 is a block diagram showing a specific configuration example of the PFC circuit according to the second embodiment of the present invention. Instead of using two coils with different numbers of turns as shown in FIG. 8, the PFC circuit according to the second embodiment, as shown in FIG. 9, switches (SW ) 5 is used to change the number of turns.

  The coil 3 is a coil with an intermediate tap, and includes a coil 3a and a coil 3b. The coil 3b is a coil whose winding number is optimized for DC-48V, and the coil 3 (coil 3a + coil 3b) is a coil whose winding number is optimized for AC 100 to 240V.

  When DC-48V is applied to the input (IN), the switch (SW) 5 is closed to select the coil 3b in which the number of turns is optimized for the DC-48V, and AC 100 to 240V is applied to the input (IN). When given, the switch (SW) 5 is opened to select the coil 3 (coil 3a + coil 3b) whose number of turns is optimized for AC 100 to 240V.

  Thereby, an AC / DC input-compatible power source can be realized. The PFC circuit according to the second embodiment has the same configuration as the PFC circuit of FIG. 7 except that a tap is provided on the coil 3 and a switch (SW) 5 is added.

  Since the AC / DC input-compatible power supply device according to the second embodiment only adds the switch (SW) 5 to the circuit of FIG. 7, it is possible to reduce the number of circuits and optimize the efficiency. Can do.

1, 2, 3 Coil 4, 5 Switch (SW)
6 Switching element 7 Control circuit 8 Rectifier diode 9 Capacitor

Claims (4)

An AC / DC input-compatible power supply device including a PFC circuit and a DC / DC converter circuit,
A coil is provided at the input stage of the PFC circuit,
An AC / DC input-compatible power supply device, wherein the number of turns of the coil can be selected in accordance with a voltage input to the PFC circuit. Two coils with different winding numbers are provided at the input stage of the PFC circuit,
2. The AC / DC input-compatible power supply device according to claim 1, wherein any one of the coils can be selected in accordance with a voltage input to the PFC circuit.   The two coils are coils on one side of an intermediate tap of a coil with an intermediate tap, the coil having an optimized number of turns for DC, and the entire coil of the intermediate tap with an AC The AC / DC input-compatible power supply device according to claim 2, wherein the number of turns is a coil that is optimized. A PFC circuit used in an AC / DC input-compatible power supply device,
With a coil,
A PFC circuit, wherein the number of turns of the coil can be selected in accordance with a voltage input to the PFC circuit.

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