JPH02303328A - Auxiliary power supply device - Google Patents

Abstract

PURPOSE:To miniaturize a primary power source device by connecting plural pieces of batteries in parallel during primary power supply so as to lower the charge voltage of the battery, and connecting these plural pieces of batteries in series during primary power cutoff so as to supply required voltage from the batteries. CONSTITUTION:This is equipped with plural pieces of changeover circuits wherein three transistors (21, 31, and 41), (22, 32, and 42), or (2n, 3n, and 4n), which make and break circuits receiving power source voltage detection signals 120, 130, and 140 detected from primary power source voltage 101, and one secondary battery 11, 12 or 1n make a pair. And it becomes possible to charge plural pieces of secondary batteries 11, 12 and 1n in parallel during the supply from the primary power source voltage 101 by make and break of the three transistors (21, 31 and 41), (22, 32 and 42), or (2n, 3n and 4n), and at the time of voltage drop or cutoff of the primary power source voltage 101, plural secondary batteries 11, 12 and 1n are connected in series, and plural pieces of changeover circuits are connected in parallel so that they may supply voltage in place of the primary power source.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information processing device, and more particularly to an auxiliary power source switching supply device for the purpose of downsizing the power source device.

Conventional technology Conventionally, in an auxiliary power supply circuit, several batteries 109 and 110 are arranged in series to match the voltage to be supplied to the secondary battery, and the secondary battery is charged when the main power is supplied. Since this requires a voltage higher than the electromotive force of the secondary battery, two types of power sources were prepared: a power supply voltage 102 for charging the secondary battery and a power supply voltage 101 for supplying to the system.

Problems to be Solved by the Invention As mentioned above, in the conventional auxiliary power supply circuit, the charging source for the battery and the power supply for the system have two different voltages.
Since different types of power sources are required, there is a drawback that the power supply device becomes large in the entire system.

The present invention has been made in view of the above-mentioned conventional situation,
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a novel auxiliary power supply device which eliminates the above-mentioned drawbacks inherent in the conventional technology and which enables miniaturization of the main power supply device.

Differences between the invention and the prior art In contrast to the above-mentioned conventional auxiliary power supply device, the present invention has the following features:
The batteries are divided into n+1 @, and these n0 batteries are supplied with main power through a set of three transistors that open and close in response to power supply voltage detection signals generated according to three types of main power supply voltages. The difference is that sometimes they are connected in parallel to lower the charging voltage of the batteries, and when the main power is cut off, these n+1 (1!) batteries are connected in series to supply the necessary supply voltage from the batteries.

Means for Solving the Problems In order to achieve the above object, the auxiliary power supply device according to the present invention includes three transistors that open and close in response to a power supply voltage detection signal that detects the main power supply voltage, and one secondary transistor. It is configured with a plurality of switching circuits each including a set of batteries, and by opening and closing the three transistors, the plurality of secondary batteries can be charged in parallel when supplied from the main power supply voltage,
In addition, when the main power supply voltage drops or is cut off, the plurality of secondary batteries are connected in series, and the plurality of switching circuits are connected in parallel so that voltage can be supplied in place of the main power supply. It has characteristics.

Embodiments Next, preferred embodiments of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a circuit configuration diagram showing a first embodiment according to the present invention, and FIG. 2 is a main power supply voltage 1 in this first embodiment.
01 and three types of power supply voltage detection signals (120, 130, 1
40''), and FIG. 4 shows the first set of switching circuits among the zero sets in this first embodiment.

For convenience of explanation, first referring to FIG. 4, the backup power input terminal 72 is connected to the emitter of transistor 2 and the emitter of transistor 3. The base of this transistor 2 is connected to one end of a resistor 5, and the other end of this resistor 5 is connected to a power supply voltage detection signal line 12.
Connected to 0. Furthermore, the collector terminal of the transistor 2 is connected to the backup power supply output terminal 73 and to the anode of the battery 1. The collector of transistor 3 is connected to the cathode of battery 1 and the collector of transistor 4. Further, the base terminal of this transistor 3 is connected to a resistor 6k, and the other end of this resistor 6 is connected to a power supply voltage detection signal line 130.

The base of the transistor 4 is connected to a resistor 7k, the other end of the resistor 7 is connected to the power supply voltage detection signal line 140, and the emitter of the transistor 4 is connected to one end of a resistor 8. The other end is grounded.

Here, when k=1, the backup power input terminal T
2k (k=1), that is, T21, is connected to the anode of the battery 10, and the cathode of this battery IO is grounded.

Also, when =11, the backup power output terminal 73
k (k=n), that is, T3nk, is connected to the cathode of the diode 104, the backup power output terminal T15, and the capacitor 105, the anode of this diode 104 is connected to one end of the resistor 103, and the other end is connected to the main power input terminal. Connected to Tll. Further, the other end of the capacitor 105 is grounded.

1(k(n), the backup power supply input terminal T2 is connected to the backup power supply output terminal T3(k-1), and the backup power supply output terminal T3 is connected to the backup power supply input terminal T2(k-1).
k+1) to form the entire circuit as shown in FIG.

When the voltage from the main power supply line 101 is supplied from the main power input terminal Tll, all of the power supply voltage detection signals 120, 130, and 140 are "
This turns transistor 2 ON.
, the transistor 3 is "OFF" and the transistor 4 is "ON", and the batteries 10 to In are connected in parallel and can be charged as secondary batteries with the voltage supplied to the system.

Further, when the main power supply voltage 101 starts to decrease, the power supply voltage detection signal 12Q becomes "off" at voltage V in the order shown in Table 1.
, the power supply voltage detection signal 140 becomes "L" at the detection voltage v2, the power supply voltage detection signal 130 becomes "L" when the detection voltage is V, and transistors 2, 3, and 4k are turned OFF, -ON.
","OFF"', the secondary batteries lO to ln are connected in series and discharged at the supply voltage necessary for backup,
You can back up your system.

FIGS. 3 and 5 of Table 1 are circuit configuration diagrams similar to FIGS. 1 and 4 showing a second embodiment of the present invention.

Referring to FIGS. 3 and 5, the difference between the second embodiment and the first embodiment is that 1 has only one piezovoltage detection signal, and transistors 2k, 3k, and 4 A circuit configuration is adopted that controls everything simultaneously.

A power supply voltage detection signal 120 is connected in parallel to resistors 5k, 6k, 7k and capacitors 17k, 18k, 19, and further connected to the bases of transistors 2k, 3k, 4. These resistors 5k, 6k, 7 and capacitor 17, 18k.

19th Niyotte Transis 92k, 3k, 4th/Jfm
By controlling the closing time, the same effect as in the first embodiment can be obtained.

As described in detail, according to the present invention, the secondary battery is divided into two parts, a piezovoltage detection signal is input to the secondary battery, and when the main power is supplied, n) the IH secondary battery connect in parallel,
When the main power supply is cut off, it has a 3FII transistor that connects these nil M secondary batteries in series, and when the main power supply is supplied, these two secondary batteries are charged with the operating voltage of the system, and the main power supply is restored. When shutting down, the system operating voltage is
By supplying the power with the ilM secondary battery, the main power source can be made into a single voltage, and the main power source device can be miniaturized.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing a first embodiment of the present invention;
FIG. 2 is a diagram showing the relationship between the main power supply voltage and the three power supply detection signals (121, 131, 141) in the first embodiment, and FIG. 3 is a circuit configuration diagram showing the second embodiment according to the present invention. , FIG. 4 is a circuit diagram showing a set of switching circuits in the first embodiment,
FIG. 5 is a diagram showing a set of switching circuits in the second embodiment, and FIG. 6 is a circuit diagram showing a conventional example. 10~ln-battery, 21~2n, 31~3n, 41"
4n-transistor, 5l-5n, 61-6n, 71
~7n, 81~8n - Resistance, 171~17n, 181
~18n, 191~19n - Capacitor, 101 ・
・・Main power line, 102 ・・Battery charging power line, 1
03,107...Resistance, 104. LOG...Diode, 105...Capacitor, 108...Transistor, 109, 110...Battery, Tll...Main power input terminal, TI2. T13. T14...Voltage detection signal input terminal, T15...Backup power supply output terminal, T
16... Charging power supply input terminal, 72k... Backup current input terminal, 73k... Backup current output terminal, T4, T6, 78k... Power supply voltage detection signal input terminal, T5k. 77 k, T9 k...Power supply voltage detection signal output terminal, 120.130°140...Power supply voltage detection signal Patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai Figure 5

Claims (1)

[Claims] In an auxiliary power supply circuit including the secondary battery of a system that uses a secondary battery such as a semiconductor disk to provide backup when the main power supply is cut off or decreased, three It has a plurality of switching circuits including a transistor and one secondary battery as a set, and charges the plurality of secondary batteries in parallel when supplied from the main power supply voltage by opening and closing the three transistors. the plurality of switching circuits are connected in parallel so that when the main power supply voltage drops or is interrupted, the plurality of secondary batteries are connected in series and voltage can be supplied in place of the main power supply voltage. An auxiliary power supply device characterized by: