JPS60216767A - Multi-input multi-output converter - Google Patents

Abstract

PURPOSE:To reduce the size of a power source which occupies in the entire converter by detecting the voltage of a DC power source, and setting a switch which converts the conduction and the nonconduction of a load current to the nonconduction when the detected voltage is not normal. CONSTITUTION:The first DC power source 1 is obtained by rectifying a commercial power source. The second DC power source is a battery 11. When the power source 1 is normal, a switch 15 is conducted to supply a current through a transformer 2 to both loads 9 and 10. When the commercial power source is interrupted and the voltage of the power source 1 is reduced, it is detected by a voltage detector 13 to set the switch circuit 15 to nonconduction. Thus, since an unnecessary discharge of the battery 1 can be avoided, the discharge continuing time of the battery 11 can be extended.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention provides a system for supplying load current (output current) to a plurality of output side loads using a plurality of DC voltages having different voltage values as input side voltages. This invention relates to a multi-input multi-output converter as a possible power supply device.

[Prior art and its problems]

In a converter as a power supply device, in order to increase the reliability of its operation, the converter has uninterruptible characteristics by using multiple DC power supplies for human power, that is, even if any of the input power sources experiences a power outage, Converters that make it possible to continue supplying power to a load using the remaining input power source are conventionally known.

As such a power supply device (converter), there is a simple device already proposed by the present inventors (Japanese Patent Application No. 57-21892), which will be explained below with reference to FIG.

FIG. 1 is a circuit diagram showing a conventional multiple-input multiple-output converter proposed by the present inventors. In the same figure, 1
is the first DC power supply, 2 is a transformer, 3 is a switch, 4 is a drive circuit for switch 3, 5゜7 is a rectifier diode, 6 and 8 are smoothing capacitors, 9.10 is a load, 11 is a second A battery is used as a DC power source, and 12 is a diode.

In this converter, power is supplied from the first DC type a1, and the transformer 2 and switch (switching transistor) 3 convert this into high frequency. moreover,
Two outputs are taken out from the transformer 2, rectified and smoothed by diodes 5 and 7 and capacitors 6 and 8, respectively, and then DC power is supplied to loads 9 and 10. At the same time, an intermediate tap is provided in the primary winding of the transformer 2, and power is also supplied to the tap from the second DC power source (here, the battery 11) via the diode 12.

By selecting the number of turns n and n2 of the primary winding of the transformer according to the magnitude of the voltage of the DC power supplies 1 and 11, the diode 12 normally prevents discharge from the battery 11, and the DC type tX1 is used as a converter only. The device can be configured to provide power to the device. If the DC type tA1 is disconnected due to a power outage or failure, the diode 12 is turned on by the voltage of the battery 11, so that the battery 11 is discharged and power is supplied to the load. As a result, the discharge of the battery 11 can be minimized only when necessary, and the capacity of the battery 11 can be maintained as much as possible in an accumulated state in case of an abnormality in the DC power supply 1. can be configured.

However, as shown in Fig. 1, when the converter has multiple loads such as loads 9 and 10, and these multiple loads are used depending on which of the DC power supply 1 and the battery 11 is used for human power, Conventional converters still have shortcomings. That is, for example, if the DC type [1 is normal, power is supplied to both the load 9 and the load 10,
Considering the case where it is only necessary to supply power to the load 9 when the DC power supply 1 becomes abnormal, in the configuration shown in FIG. Retention time becomes shorter.

Therefore, in order to extend the battery holding time, it is necessary to increase the battery capacity, which is a problem in making the converter more compact and economical.

A specific example of using a plurality of loads as described above will be described below.

Currently, the subscriber lines for telephone callers are constructed of single-metallic metal, and power is supplied uninterrupted from the central office using 4.8 V, but in the future, subscriber lines may become communication channels using optical fibers. If the station is replaced, such power supply from the station side cannot be expected. Therefore, as an inside power source, it is necessary to prepare an uninterruptible uninterruptible power supply device consisting of a commercial power source and a battery.

In such a power supply device, considering the case of a power outage in the commercial power supply, among the loads on the power supply device, functions that are absolutely necessary (for example, the function of a black telephone) will remain even in the event of a power outage, and other functions that are not necessarily necessary (for example, It is possible to extend the life of batteries by disconnecting and using different types of batteries (such as CATV, which are connected to fiber optic communication channels), but conventional converters do not take into account the different uses of such loads. Therefore, it was necessary to increase the battery capacity, which caused problems in making the converter more compact and economical.

[Purpose of the invention]

The present invention has been made in order to solve the problems in the prior art as described above, and an object of the present invention is to eliminate the need to increase the capacity of a battery prepared in addition to a commercial power source, and thus to reduce the size of the battery. The object of the present invention is to provide a multi-input, multi-output converter that can be easily made more economical and economical.

[Key points of the invention]

The gist of the present invention is to connect a first DC power supply to a series circuit of the primary winding of the transformer and a switching element, and to connect a first DC power supply to a connection point between the DC power supply and the switching element and to the primary winding. A second DC power supply is connected between the intermediate tap and the
and a multi-input multi-output converter in which a plurality of windings are provided on the secondary side of the transformer, and power is supplied to a plurality of loads via the plurality of windings, wherein the voltage of the first DC power source is A voltage detection circuit that detects and determines whether the DC voltage is normal or not, and a switch circuit that can switch between conduction and non-conduction of a load current in at least one of the plurality of loads, the voltage detection circuit The detection output obtained by the above-mentioned DC power source is inputted to the switch circuit via a signal transmission circuit, and when the voltage of the first DC power source is not normal, the switch circuit is made non-conductive.

(Example of the invention) The present invention will now be described in detail with reference to the drawings.

FIG. 2 is a circuit diagram showing one embodiment of the present invention.

In this figure, the same elements as in FIG. 1 are given the same reference numerals. In addition, 13 is a voltage detection circuit, 14
1 is a signal transmission circuit, and 15 is a switch circuit.

In this configuration, the first direct current type FX 1 is an energy source obtained by rectifying a commercial power source, the second DC power source is a battery 11, the load 9 requires constant power supply, and the load 1o is an energy source obtained by rectifying a commercial power source. The circuit operation will be described on the assumption that power supply is required only when the direct type a1 obtained from the equation is normal.

When the DC power supply 1 is normal, the switch circuit 15 connected in series to the negative @1o is kept conductive, and power is supplied to both the load 9 and the load 10 via the transformer 2. If the voltage of the direct type tA1 drops due to a power outage in the commercial power supply, etc., the voltage detection circuit 13 detects this and sends a signal to the switch circuit 15 via the signal transmission circuit 14, and the switch circuit 15 is made non-conductive.

At this time, on the primary side of the converter, power is supplied to the transformer 2 from the battery 11 via the diode 12, and the energy of the battery 11 is transferred to the transformer 2.
is supplied only to load 9 via. voltage detection circuit 13,
Since the power loss in the signal transmission circuit 14 and the switch circuit 15 can be made sufficiently smaller than the power consumed by the load 10, unnecessary discharge of the battery 11 can be avoided, and the discharge of the battery 11 can be sustained. You can extend the time.

FIG. 3 is a circuit diagram showing another embodiment of the present invention. In the figure, IIA is a battery, 16 is a guiostat, 17 is a smoothing capacitor, IB is a charging control circuit, and 19A is a light emitting element (
19B is a light receiving element (photoelectric converter), that is, I9Δ, 1913 constitutes a photocoupler. 20 is a transistor, 21 is a control circuit, 22.
23 are loads, respectively.

This configuration uses a rechargeable secondary battery as the battery 11A, and when the first direct type tj1 is normal, it receives power from the DC power source 1 through the transformer 2, diode 16, and capacitor 17, The battery 11A is charged via the charging control circuit 18. Also, at the same time, transformer 2
Power is also supplied from direct type #1 to loads 9° 22 and 23 via.

Loads 22 and 23 are connected to diode 7 via transformer windings.
After the alternating current is converted into direct current by the smoothing capacitor 8, they are separated at the direct current section (at both ends of the capacitor 8), and the load 22 is further supplied with power through the transistor 2°, and the load 23 is supplied with power directly.

When the direct type #1 becomes abnormal and the voltage detection circuit 13 detects a voltage drop, the detection output is sent to the charging control circuit 18, and the charging control circuit 18 makes the charging circuit for the secondary battery 11A non-conductive. , the charging of the battery 11A is stopped, and a signal is sent to the control circuit 21 via the photocoupler consisting of the light emitting element 19A and the light receiving element 19B, and the transistor 20 becomes non-conductive and the load 2 is turned off.
Control is performed such that power supply to No. 2 is stopped. Therefore,
When there is an abnormality in the direct type a1, power can be supplied from the battery 11A only to the loads 9 and 23, and power cannot be supplied to the load 22.

In FIG. 3, from the voltage detection circuit 13 to the control circuit 21,
A photocoupler (19A
, 19B), but when a photocoupler is used in this way, the primary and secondary
This has the advantage of maintaining insulation between the two. Further, when using the rechargeable secondary battery 11A as the second DC power source, when the secondary battery 11A is discharged during a power outage of the DC power source 1, the discharge current flows through the diode 12, the transformer 2, the diode 16 , the capacitor 7, and the charge control circuit 18, and the amount of discharge from the battery 11A increases. Therefore, in order to cut this off, the charging control circuit 18
It is necessary to control the charging circuit for the battery 11A to make it non-conductive, but since the control command for making this non-conductive can also be obtained using the output of the voltage detection circuit 13, the charging control circuit 18 Compared to the case where separate voltage detection circuits are used for controlling the load 22 and isolating the load 22,
Since only one voltage detection circuit is required, there is an advantage that the number of components does not need to increase.

According to the present invention, the load can be increased or decreased depending on the type of input power source (commercial power source or battery). If the present invention is applied to a device in which the power supply mode to the load can differ depending on the input power source, the device can be made smaller and more economical since there is no need to increase the battery capacity. It is effective in terms of

〔Effect of the invention〕

As explained above, according to the present invention, in a multi-input multi-output converter, when the battery is discharged during a commercial power outage, the power required by the load can be reduced compared to the power required at all times. This has the advantage that it requires less capacity, reduces the size of the power supply that occupies the entire device, and can be economical.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing a conventional multiple input multiple output converter.
FIG. 2 is a circuit diagram showing one embodiment of the invention, and FIG. 3 is a circuit diagram showing another embodiment of the invention. Description of symbols 1...DC power supply, 2...Transformer, 3...Switch (transistor), 4...Drive circuit, 5, 7, 12
゜16...Diode, 6,8.17...Capacitor, 9.10,22.23...Load, 11. IIA・
...Battery, 13...Voltage detection circuit, 14...Signal transmission circuit, 15...Switch circuit, 18...Charging control circuit, 19A, 19B...Photocoupler, 20...
・Transistor, 21... Control circuit agent Patent attorney Akio Namiki Agent Patent attorney Kiyoshi Matsuzaki tJ 1 Figure 2

Claims (1)

[Claims] 1) A first DC power supply is connected to the series circuit of the primary winding of the transformer and the switching element, and a first DC power supply is connected to the connection point between the DC power supply and the switching element and the primary winding. A second DC power supply is connected between the intermediate tap and a plurality of windings are provided on the secondary side of the transformer, and power is supplied to a plurality of loads via the plurality of windings. In the input multi-output converter, a voltage detection circuit detects the voltage of the first DC power supply and determines whether the DC voltage is normal;
A switch circuit capable of switching between conduction and non-conduction of a load current in at least one of the plurality of loads is provided, a detection output from the voltage detection circuit is input to the switch circuit via a signal transmission circuit, and the A multi-input multi-output converter, characterized in that the switch circuit is made non-conductive when the voltage of the first DC power source is not normal. 2. In the multi-input multi-output converter according to claim 1, the first DC power source is a DC power source obtained by rectifying a commercial AC power source, and the second DC power source is a battery. A multi-input multi-output converter characterized by using. 3) A multi-input, multi-output converter according to claim 1 or 2, wherein the signal transmission circuit comprises a signal transmission circuit including a photocoupler.