JPS5843006A - Detecting system for fault of power supply - Google Patents

Abstract

PURPOSE:To realize both miniaturization and low cost of a power supply device, by providing a common connection line to connect each unit containing a fault detecting means of the power supply device and a main power supply device. CONSTITUTION:An output line 313 of a main power supply device 301 is connected to the power supply input terminal of a controller 302, the 1st unit 303 and the 2nd unit 304 respectively. The controller 302 contains power supply devices 305, 306 and power supply fault detecting parts 309, 310. Thus the output of detection obtained in a fault mode of voltage is supplied to a common line 314. The 1st and 2nd units 303 and 304 contain the power supply devices 307 and 308 as well as power supply detecting parts 311 and 312. The output terminals of the parts 311 and 312 are connected to the line 314.

Description

[Detailed description of the invention] The present invention relates to a power supply abnormality detection system.

Electronic devices include cow conductors, CRTs, and printers.
Includes various unit devices that require power. For many electronic devices, power supplies that can provide a wide variety of regulated voltages and waveforms are used. In addition, the power supply is designed to have a margin in output capacity and to allow additional units to be added at a later date.The power supply is equipped with a power supply abnormality detection means for detecting abnormalities in the power supply to each unit. Benevolence is essential. For the sake of convenience, a conventional multi-output power supply that provides a variety of outputs is provided as shown in Figure 1, and this multi-output power supply! 1.0.1 output terminal group 105 to unit 103, 104 and control p
-2102 is supplied with the power required, and the voltage value Vl-V, current value, etc. at the output terminal group 105 is monitored at the power supply.

With such an i-power supply device, various types of power outputs can be easily monitored. Considering the addition of units one day later, it is necessary to ensure that each of the six stabilized outputs in the multi-output power supply 101 has a sufficient capacity, which means that the power supply becomes large and requires space and cost. It becomes a problem in terms of

To solve this, we have a single main power supply, each:
There are attempts to create the required voltages and waveforms in L-nits. That is, as shown in FIG. 2, each unit 203.
204s? and the converting means 205 to the controller 202.
208 to form the necessary power supply in each device. However, it is difficult to form the necessary power supply for each control 03, 204 and control 220. In other words, when the multi-output power supply 101 generates outputs of various voltages and waveforms stabilized by the multi-output power supply 101, power supply abnormalities can be managed centrally, making it easy to track each circuit in the event of a power supply abnormality. On the other hand, as shown in FIG. 2, it is difficult to detect an abnormality in the method of detecting an abnormality in the power supply in a single line 209. Also, 203, 204 and Con)
Providing the El-9202 with an abnormality detection circuit and an abnormality control circuit increases costs. 'The present invention is proposed to address the above-mentioned problems. The main object of the present invention is to provide a power supply abnormality detection system that can sufficiently reduce the size and cost of the power supply by providing a common detection line connecting each unit and the main power supply. It is in.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 3, soi is a main power supply device, and an output line 313 and a common line 314
RBB is derived. In addition, in the figure, Earthline company is omitted = Output line 313 company = Ntp-La 302, 1st OL unit 303, and 2nd unit)
304C) The output voltage v1 of the Toryu* device 301 is connected to a power input terminal (not shown), and the output voltage v1 of the ``controller 302'' and the ``1st. □ supplied to the -2nd units 303 and 304. Control-2302 has a power supply AOS, S
os'it is provided with these power supplies'SOB, a
The voltage V required for the operation of the controller 362 in the OS,
This is because SV is converted from the output voltage V of the main power supply 301. The controller 9B02 further includes power supply abnormality detection 5sos, 5tosau, and voltage V*5VsO.
At the time of abnormality, a detection output Ksp#f is supplied to the common line 314'. 9, 1st. Second tool knit 303. Tei 04
゛ includes a power supply device 307.110B and a power supply abnormality detection unit 31.
1.312 is thrown sand and the power abnormality detection unit 311
, 3120' output terminals are connected to the common line 3'14. ' Fig. 4 is a block diagram of another embodiment of the present invention. Fourth
In the figure, 401 is a controller with 402 and 403
is a unit. The voltage Vs~Yet required for the controller 401 and the units 402 and 403, respectively, is
Ta J6, electric 111i 404, 405, 412゜41
7 is provided. Additionally, in order to detect abnormalities in the outputs of the power supplies 404, 405 in the controller 2401, relay devices 406, 407 such as undervoltage relays are connected between the output terminals of the power supplies 404, 405 and ground. Normally closed contacts 408, 40 of relay devices 406, 407
9 are connected in parallel and connected between the common line PER and ground. A positive potential is applied to the common line PER by a resistor 410 at the input terminal of the inverter 411. Therefore, when there is an abundance, the normally open contact point is lowered by 408 degrees.

The unit 402 also includes a photocoupler 414 to detect abnormalities. Since voltage v4 is supplied to the photocoupler 414e) through the resistor 416, the output level of the photocube M)-4140 is always at the deaf level. This 7o is cool? -414°1
It is supplied to the common line PER via 1114/<, '77 A, 4.3 Alternatively, a comparison output is generated when the voltage exceeds the reference value.If the voltage exceeds the specified voltage range, either operate the comparator 4!9 below the reference value or operate the cosciparator 419 above the reference value. Whether or not to operate the comparator 419 when the power source 417 is activated can be determined based on the type of load connected to the power supply 417 in the unit or other circuit conditions.・
A common twin PERK is provided via the IC.

Next, the operation of the present invention will be explained. In FIG. 3, when any of the power supply abnormality detection units 309 to 3 2 in the controller 1-2302, the first unit 303, or the second unit 304 operates, the common fin 314
The potential of PER changes. Common twin l 14 PE
Since R is connected to the main power supply device 3010 control circuit, the main power supply device 301 controls the disconnection of the circuit O11. In addition, if the output voltage V, V, of any one of the power supplies 404, 405 in the power supply unit [404, 405] in FIG. Since 408 and 409 are closed, the common line PE
The potential of H becomes zero. If the output voltage v4 of the power supply device 4120 in the unit 402 decreases, the photocube?
Since the amount of light emitted from the confectionery on the light-emitting side of -414 decreases, the output of the buffer 413 decreases. Furthermore, when the output voltage vs of the power supply device 417 at 40 m becomes less than the set value, the output of the buffer 418 becomes zero. Therefore, even if there is an abnormality in any of the power supply devices 404, 405, 412, 417 in the controller 401 or 402, 403, the voltage value of the common line PER will change, so the occurrence of the abnormality can be easily detected on the main power supply side. . It should be noted that abnormality detection in the power supply device can be performed not only for undervoltage detection shown in the above-described embodiments but also for various abnormal values such as overvoltage and overcurrent. Although the embodiments have been described using relays, photocouplers, and amparators to detect an abnormality, various other known detection means such as a meter relay may also be used.

Since the present invention is configured and operates as described above, it is possible to reduce the size and cost by using one type of output from the main power supply, and also to prevent abnormalities in the power supply connected to the main power supply. It can be recognized in the main power supply unit.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing an example of a conventional power supply system.
No. 2 is a block diagram showing an example of a power supply system in which each unit is provided with a power supply device, No. 31 is a block diagram of an embodiment of the power supply system according to the present invention, and FIG. 4 is a block diagram of an example of the power supply system according to the present invention. FIG. 3 is a block diagram of another embodiment. Komude 301 is the main power supply unit. 305-308 and 4
04,405,412.417 is a power supply device, 309-3
12 is a power supply abnormality detection section. Figure 1 Figure 2 Figure 3 Figure 1 Figure 4

Claims (1)

[Claims] A power supply abnormality detection system including a power supply device that converts a voltage received from a main power supply device into a required voltage, and a plurality of units each having an abnormality detection means for the power supply device, the system comprising: A power supply abnormality detection system characterized in that the units are connected by a common line that transmits the output of the abnormality detection means.