JPH0583883A - Electronic component device - Google Patents

Abstract

PURPOSE:To reduce the size of the whole system by mounting an auxiliary power supply for back-up of a main power supply and a device for switching from the main power supply to the auxiliary power supply or vice versa on an electronic components mounting board. CONSTITUTION:On an electronic components 4 mounting board 50, an auxiliary power supply 20 for back-up of a main power supply 1 and voltage supplement 1 element 3 to work as a device for switching from the main power supply to an auxiliary power supply 20 or vice versa are mounted. The capacity of the auxiliary power supply for back-up 20 can be small. By mounting such an auxiliary power supply on the board 50, no special location space is necessary for the auxiliary power supply for back-up 20 when constructing the system with the plurality of the boards 50. By this method, the size of the whole system can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component device,
In particular, the present invention relates to an electronic component mounting board in which a plurality of electronic components are mounted, and a power source is compact when configuring a system.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing a conventional electronic component device and its power source. In the figure, 1 is a main power source for supplying power during normal operation, and 2 is a battery connected in parallel with the main power source 1. Backup battery, 3 is a voltage control element for detecting a drop in the voltage of the main power supply 1 and switching to the backup battery 2, 4 is an electronic component such as an IC, 5 is an electronic component mounting board 5 or is mounted on this The range of equipment. When actually constructing a system using the above electronic component mounting boards, a plurality of boards 5 are provided for one main power supply 1 and one backup power supply 2 as shown in FIG. 2 (b). It will be connected.

Next, the operation will be described. In use, when the voltage of the main power supply 1 drops below a predetermined value, the voltage control element 3 detects the voltage drop and switches to the backup battery 2. If the electronic component 4 connected to the power source 1 or 2 is, for example, a memory element, the backup battery 2 can hold information for a certain period of time.

[0004]

The conventional electronic component device is constructed as described above, and in addition to the main power source, the backup battery and the voltage control element for controlling the switching of these batteries are external to the mounting board. It is necessary to use a comparatively large battery because it is necessary to back up all electronic component mounting boards, so it is necessary to provide a space to arrange the backup battery when configuring the system. However, there is a problem that the size of the entire system becomes large.

The present invention has been made in order to solve the above problems, and even if a system is configured by using a plurality of electronic component mounting boards, the size of the entire system is increased due to the arrangement space of the backup power source. It is an object of the present invention to provide an electronic component device that does not have such a problem.

[0006]

An electronic component device according to the present invention is provided with an auxiliary power source for backing up a main power source on an electronic component mounting board, and a switching means for switching between the main power source and the auxiliary power source. It is the one.

[0007]

In the present invention, since the capacity of the backup auxiliary power supply may be small, it is mounted on the board to save the arrangement space of the backup power supply when the system is constructed using a plurality of boards. It can be unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An electronic component device according to an embodiment of the present invention will be described below with reference to FIG. In the figure, the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and the range of the board 50 includes the backup battery (auxiliary power source) 20 and the voltage control element 3.

Next, the operation will be described. When a plurality of boards 50 configured as described above are connected to the main power supply 1 to form a system and power is supplied to the electronic components of each board 50 to operate them, the power supply potential is predetermined by some cause. When the voltage drops below the potential, the voltage control element 3 detects the voltage drop, and the main power source 1 and the backup power source 20 mounted on each board are switched,
The power supply to each board 50 is compensated for a predetermined time.

Further, when the drive allowable voltage value of the electronic component is different for each board 50, the operation threshold value of the voltage control element 3 mounted on each board is set according to the drive allowable voltage value of the board. As a result, it is possible to back up only the boards that require backup, and it is possible to prevent the capacity of the backup battery 20 from discharging in boards that do not require backup.

As described above, according to the present embodiment, the backup battery 20 is provided for each board 50 individually.
Actually, it is a small chip unit, and therefore can be easily mounted on the board 50. Therefore, when a system is configured using a plurality of boards 50, a space for arranging a backup power source is not required, and result,
The system size can be made compact.

In the above embodiment, the backup battery 2 and the voltage control element 3 are mounted on the board.
If the power consumption on the board is sufficiently small, the main power supply can be made small, and the main power supply 1 can also be individually mounted on the board, and the board mounting density is improved and the main power when systematized. It is also possible to reduce the space for disposing the power supply.

A specific example of the electronic component 4 is a memory element such as SRAM or DRAM. In this case, the electronic component mounting board is called a memory module.

By configuring the voltage control element 3 and the backup battery 2 using an SMD (Surface Mount Device), the board mounting density can be further improved and the system can be made more compact.

[0015]

As described above, according to the electronic component device of the present invention, the electronic component mounting board is provided with the auxiliary power source for backing up the main power source and the switching means for switching between the main power source and the auxiliary power source. Since it is mounted, there is an effect that the power source arrangement space at the time of system configuration is unnecessary and the size of the entire system can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing an electronic component device and its power supply circuit according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional electronic component device and its power supply circuit.

[Explanation of symbols]

 1 main power supply (main power supply) 2 backup battery (auxiliary power supply) 3 voltage control element (switching means) 4 electronic component 5 board range

Claims (1)

[Claims] 1. An electronic component device, comprising a plurality of electronic components mounted on an electronic component mounting board, wherein each electronic component is driven by a main power source to perform a predetermined operation. And an auxiliary power supply for backing up the main power supply, and a switching means mounted on the electronic component mounting board for switching between the main power supply and the auxiliary power supply. ..