JPH0879970A - Power supply device - Google Patents

Abstract

PURPOSE: To simultaneously supply power from each power supply to each load in a device with a plurality of power supplies and to provide a power supply device without any malfunction or damage of elements. CONSTITUTION: When the rising of a power supply 1 is detected by a detection circuit 3, that of a power supply 2 is detected by a detection circuit 4, and that of both power supplies is judged according to the output of the detection circuits 3 and 4 by a control circuit 6, switches 5a and 5b are simultaneously turned on, thus simultaneously supplying power from each power supply to each load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device having a plurality of power supplies, and more particularly to starting up the power supply device.

[0002]

2. Description of the Related Art Conventionally, in an apparatus having a plurality of power supplies, the power supplies are controlled independently or in a master-slave relationship such as main and sub.

[0003]

In this conventional configuration,
In the case of independent control, the time from turning on the power switch until each power supply rises varies depending on each power supply, and the units or devices connected to those power supplies do not start up at the same time.

Even in a power supply having a master-slave relationship, there is a time lag in the rise of the power supply, and the rise of the power supply of the unit or the device is also different.

For this reason, the aforementioned units or devices are
If they are connected to each other by a signal line such as a bus, current may flow from the power source that started up to the unit or device that has not started up yet through the signal line, causing malfunction or destruction of elements. .

The present invention has been made in order to solve such a problem, and provides a power supply device in which power is supplied from each power supply to each load at the same time without causing malfunction or destruction of elements. That is the purpose.

[0007]

In order to achieve the above object, the present invention is configured to supply power to each load at the same time after all the power supplies have started up. Specifically, the power supply device is configured as in (1) and (2) below.

(1) A plurality of power supplies, a plurality of switches for turning on and off between each power supply and each load in the plurality of power supplies, and a detection means for detecting the rise of each of the plurality of power supplies, A power supply having a determination means for determining that all of the plurality of power sources have started up based on the output of the detection means, and a drive means for driving the plurality of switches to be turned on simultaneously based on the output of the determination means. apparatus.

(2) A plurality of power supplies, a plurality of switches for turning on and off between the respective power supplies and the respective loads in the plurality of power supplies, and detection for detecting rising and falling of each of the plurality of power supplies. Means and a second determination for determining that all of the plurality of power supplies have risen and a second determination for determining that at least one of the plurality of power supplies has fallen based on the output of the detection means. And a driving means for driving the plurality of switches to be turned on at the same time based on the first determination made by the determination means, and for driving the plurality of switches to be turned off at the same time based on the second determination. Power supply.

[0010]

With the configurations (1) and (2) described above, when the plurality of power sources are all turned on, the switches are simultaneously driven to be turned on. In the configuration of (2), all the switches are driven off when at least one of the plurality of power supplies falls.

[0011]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 is a block diagram of an embodiment of a "power supply device".

In FIG. 1, 1 and 2 are independent power supplies, and their output terminals are connected to detection circuits 3 and 4 for detecting the rise of the output. On the other hand, the output terminals of each power source are connected to one ends of the switches 5a and 5b of the switch means 5, respectively.

The output signal lines of the detection circuits 3 and 4 are connected to the control circuit 6. The output signal line of the control circuit 6 is connected to drive coils (not shown) of the switches 5a and 5b of the switch means 5.

The other ends of the switches 5a and 5b are connected to the loads 7 and 8 of the power supply device, respectively.

In the above-mentioned configuration, when the power is turned on and the power supply 1 is started up, the detection circuit 3 operates and the output signal thereof is input to the control circuit 6. Similarly, the rise of the power supply 2 is detected by the detection circuit 4, and its output signal is input to the control circuit 6.

Hereinafter, the logic of the output in the ON state is Hi, OF.
The logic of the F state is Lo.

The control circuit 6 takes the product of the output signals of the detection circuits 3 and 4, and when both signals are in the ON state, that is, the Hi state, the output signal becomes Hi and sends the ON signal to the switch means 5. Based on the output signal of the control circuit 6, the switch means 5 simultaneously drives the switches 5a and 5b to turn on and bring them into conduction.

When the switches 5a and 5b become conductive,
The power supply 1 and the power supply 2 which have already started up are connected to the respective loads 7 and 8 via the switches 5a and 5b, and supply power at the same time.

When the power supply is cut off, the output of either the power supply 1 or the power supply 2 is stopped first, so that the output signal of either the detection circuit 3 or the detection circuit 4 changes from the ON state to O.
The FF state, that is, the state changes from Hi to Lo. Control circuit 6
Causes one of the input signals to be in the Lo state, the output signal to be in the Lo state, and the switch 5 of the switch means 5
At the same time, a and 5b are driven off to bring them into a cutoff state.

When the output of one of the power supplies is stopped due to a failure or the like, the other power supply is shut off at substantially the same time.

As described above, according to this embodiment, the load 7,
Since power supply to 8 and power cutoff are performed at the same time, it is possible to avoid the malfunction and destruction of the element as described above.

(Modification) The above-mentioned embodiment is an example of the case where there are two power supplies, but the present invention is not limited to this, and even when there are three or more power supplies, the switch means is obtained by the logical product of each detection circuit. Can be turned on and off and carried out in the same manner.

Further, in the embodiment, the switches of the switch means are electrically driven at the same time to interlock, but the present invention is not limited to this, and the switches may be mechanically interlocked. it can.

Further, each switch can be implemented in a form of being synchronously driven and turned on or off at the same time via a communication line.

[0026]

As described above, according to the present invention,
Since power is supplied to each load at the same time, it is possible to avoid malfunction and destruction of elements in the load.

Further, in a device composed of a plurality of power supplies, it is not necessary to match the rising sequence timing of each power supply.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment.

[Explanation of symbols]

 1, 2 Power source 3, 4 Detection circuit 5a, 5b Switch 6 Control circuit

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hideki Ozaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Taku Sugiura 3-30-2 Shimomaruko, Ota-ku, Tokyo Kya Non-Incorporated (72) Inventor Keiji Inaba 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Minoru Hashimoto 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (2)

[Claims] 1. A plurality of power supplies, a plurality of switches for turning on and off between the respective power supplies and respective loads in the plurality of power supplies, and a detection means for detecting a rise of each of the plurality of power supplies, A determination unit that determines whether all of the plurality of power sources have started up based on the output of the detection unit; and a drive unit that drives the plurality of switches to turn on simultaneously based on the output of the determination unit. Characteristic power supply device. 2. A plurality of power supplies, a plurality of switches for turning on and off between the respective power supplies and the respective loads in the plurality of power supplies, and a detection means for detecting rising and falling of each of the plurality of power supplies. And, based on the output of this detection means,
Determination means for performing a first determination for determining that all of the plurality of power supplies have risen and a second determination for determining that at least one of the plurality of power supplies has fallen;
Drive means for driving the plurality of switches to be turned on simultaneously based on the first determination of the determination means, and driving the plurality of switches to be turned off simultaneously based on the second determination. Power supply.