JPH0736674B2 - Power supply - Google Patents

Description

The present invention relates to a DC power supply device for switching and supplying DC power charged in a battery to a load, and downsizing the power supply device by automatically switching and supplying the DC power. For the purpose of attaining the purpose, a load direct transfer section (1) for converting an AC voltage into a DC voltage and sending the DC voltage to the load (3) and the charger unit section (2), and a battery ( In a DC power supply device having a charger unit (2) for charging 4), the charger unit (2) is
An electronic switch (21) is provided for switching power supply from the battery (4) when the AC voltage is abnormal, and the electronic switch (21) is activated when the abnormal time of the AC voltage exceeds a specified time.
When it is turned on, the power supply to the load is automatically switched to the battery (4).

[Industrial application field]

The present invention relates to a circuit system of a DC power supply device that switches and supplies DC power charged in a battery to a load.

In a normal condition, a DC power supply device for a communication device such as an exchange or a computer is rectified from an AC voltage and supplied with DC power to a load side while a spare battery is charged in advance so that the AC voltage or the DC power supply is supplied. When the equipment is abnormal, by switching and supplying DC power from the spare battery to the load,
A method of stably operating each device and system is widely used.

This switching power supply is required to be performed instantaneously without stopping the operation of the device in terms of reliability of the communication system.
For this reason, the DC power supply must ensure high reliability,
In addition, in the normal state, the load and the battery are supplied with electric power at the same time and with the same power source.

However, in this method, the DC power source has a large capacity, becomes large in size, and deterioration in reliability cannot be avoided. Therefore, switching is performed automatically, and a small power source is required.

[Conventional technology]

 FIG. 3 is a circuit diagram of a conventional DC power supply device.

In the normal state, DC power is supplied to the load 3 and the spare battery 4 simultaneously and in parallel, and when abnormal, the DC power charged in the spare battery 4 is switched and fed to the load 3. That is, the AC voltage is rectified by the rectifier CR61, filtered by the capacitor C61 to be a DC voltage, and then the DC voltage is switched by the switching signal input to the base of the transistor TR61 to be an AC voltage. Furthermore, the voltage is converted by the transformer T61, the diode D61 and the capacitor C6.
1. The capacitor C62 and the choke L61 filter and smooth the DC voltage to supply power to the load 3 and the battery 4.

However, in this switching power supply system, in a normal state, power supply to the load and charging of the battery are simultaneously performed. Since the voltage fluctuation of the battery 4 needs to be small (for example, ± 1.5%), the allowable range of the DC voltage output by the power conversion unit is limited to the floating charging voltage of the battery 4 and high accuracy is required. Become.

Further, since the load 3 and the battery 4 are supplied simultaneously in parallel, the rectifier CR61 of the power conversion unit has a large capacity (current to the load).
In addition, the silicon dropper 31 is inserted in series with the load 3 in order to compensate for the voltage difference between the DC voltage of the battery 4 and the DC voltage of the load 3. For this reason, the DC power supply device is a large power supply with many losses.

The power supply of the DC power from the battery 4 in this circuit is performed as follows.

That is, when an abnormality occurs due to an AC voltage, a trouble in the power conversion unit 6, or the like, the rectified DC voltage decreases, and a reverse voltage is applied to the diode D61.
Is turned off, and the power is automatically switched from the battery 4 to the load 3 to be supplied.

[Problems to be solved by the invention]

The conventional power supply system has achieved the purpose of switching and supplying power to the load from the battery in the event of an abnormality.

However, in a normal state, the power supply to the load and the battery is performed in parallel at the same time, so it must be a large-sized power supply device using a large-capacity rectifying semiconductor component.
Moreover, the large-capacity diode D61 and the like must have a short service life, which makes it difficult to repair the damaged diode and reduces system reliability.

It is an object of the present invention to reduce the size of a power supply device by automatically switching and supplying the DC power from the above situation.

[Means for solving problems]

 FIG. 1 is a block diagram showing the principle configuration of the present invention.

In the figure, 1 is a load direct-transmitting unit, which converts an AC voltage into a DC voltage and sends the DC voltage to a load 3 and a charger unit 2, 2 is a charger unit, which converts the DC voltage into a voltage. The charger unit 2 is provided with an electronic switch 21 for switching and supplying power from the battery 4 to the load 3 when the AC voltage is abnormal.

In the charger unit 2, the electronic switch 21 operates, and in response to the abnormal time of the AC voltage exceeding the specified time, the electronic switch 21 is turned on to automatically supply power to the load from the battery 4. It is the one to be switched.

[Action]

Normally, the electronic switch 21 is OFF, and the DC output of the load direct feed unit 1 charges the battery 4 via the load 3 and the charger unit 2. In this case, load 3 and battery 4
Is shut off because the electronic switch 21 is OFF.

However, when the AC voltage and the load direct transfer part 1 become abnormal, a gate signal is input to the electronic switch 21 and the electronic switch 21 is turned on. Therefore, the electric power charged in the battery 4 is supplied to the load 3.

〔Example〕

FIG. 2 is a circuit diagram of an embodiment of the present invention. The difference from the conventional circuit of FIG. 3 is that the electronic switch 21 of the charger unit 2 serves as a switch, and when the battery is abnormal, switching power supply of DC power from the battery 4 to the load is performed.

In the figure, reference numeral 1 is a load direct sending unit, which rectifies and filters an AC voltage by a rectifier CR11 and a smoothing capacitor C11 to convert it into a DC voltage, and sends DC power to a load 3 and a charger unit 2.

2 is a charger unit, which is an electronic switch
21 and a DC voltage converter 22. The electronic switch 21 is a circuit that is turned on / off by a gate signal, and for example, a FET or the like is used. The DC voltage converter 22 is for obtaining the battery charging voltage from the DC output voltage of the load DC unit 1. The configuration is a switching transistor that is switched by a switching signal.
TR21, a power transformer T21 that steps up and down the switched and converted AC voltage, and a diode D21, a capacitor C21, and a choke L2 that convert the AC voltage to the DC voltage.
It consists of 1.

In the normal state, DC power is supplied from the load direct delivery unit 1 to the load 3 and the charger unit unit 2. At this time, since the switching signal is not input to the gate of the electronic switch 21, the electronic switch 21 is OFF, so that the power supply from the battery 4 to the load 3 is not performed.

However, in an abnormal case, for example, when there is a power failure of the AC voltage for a specified time or longer, a gate signal is input to the gate of the electronic switch 21 to turn the electronic switch 21 ON, and the load is supplied with power from a battery. Will be done.

With this method, the charger unit 2 is exclusively used for charging the battery 4, and 1/100 to 1/1000 of the load direct transfer unit 1 is used.
It can be charged with a small power supply.

〔The invention's effect〕

As is clear from the above description, according to the present invention, by providing the electronic switch, the switching power supply between the load and the battery can be performed more reliably than the conventional method. Furthermore, since the DC power supply device that supplies DC power to the load and the power supply that supplies power to the battery are separated, the DC power supply device can be made smaller and lighter, and installation and replacement are easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a principle configuration of the present invention, FIG. 2 is a principle circuit diagram showing an embodiment of the present invention, FIG. 3 is a circuit diagram of a DC power supply device in a conventional method, and in FIG. Is a load direct-feeding unit, 2 is a charger unit, 21 is an electronic switch, 22 is a DC voltage converter, 3 is a load, and 4 is a battery.

Claims (1)

[Claims] 1. A load direct transfer unit (1) for converting an AC voltage to send a DC voltage to a load (3) and a charger unit (2); and a battery (4) for converting the DC voltage into a voltage. In the power supply device having a charger unit section (2) for operating the charger unit section (2), the charger unit section (2) includes an electronic switch (21) for switching and supplying power from the battery (4) when the AC voltage becomes abnormal. A power supply device characterized by turning on an electronic switch (21) and supplying power to a load from a battery (4) via the electronic switch (21) when the abnormal time of the voltage exceeds a specified time.