JPS589443B2 - Dengenkeishiyougaikiriwakehoushiki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a power system failure isolation system, particularly a power supply system that supplies power to an electronic device load such as a data processing device.
A power supply system that uses the detection outputs of the overvoltage detection circuit, low voltage detection circuit, and overcurrent detection circuit to isolate the fault location in the event of a power supply system failure (failure within the power supply unit or load electronic device failure). This relates to a fault isolation method.

For example, if an overcurrent flows to the load side due to a short circuit or some kind of failure in the load, which is a data processing device, or if overvoltage or low voltage occurs due to a failure in the power supply unit, protect the load data processing device and power supply unit. Therefore, it is necessary to shut off the power.

Conventionally, a power supply unit is provided with an overcurrent detection circuit, a low voltage detection circuit, and an overvoltage detection circuit to automatically shut off the power when the above-mentioned failure occurs.

However, the power supply system for this type of data processing apparatus does not display the cause of a power failure failure.

Even if you try to find the cause of the failure and turn the power back on, the detection circuit will operate again and shut it off.

Therefore, it is difficult to distinguish whether the fault occurred on the power supply unit side or whether the power supply was cut off due to a fault on the load side, and in order to isolate the fault location, it is necessary to perform troublesome operations such as disconnecting the power supply unit from the electronic device. It had the disadvantage of being necessary.

In addition, especially when considering a load such as an IC memory used in a data processing device, an overvoltage state will cause malfunction, which will eventually destroy the device, and a low voltage state will cause malfunction.

Furthermore, in the case of IC memory loads, overcurrent conditions can occur not only when a short circuit occurs within the IC memory, but also when part of the logic is incorrectly inverted.
Eventually, the element will be destroyed.

Therefore, as mentioned above, it is necessary to take measures such as shutting off the power at the time of each failure, but it is also necessary to take measures such as shutting off the power at the time of each failure, but it is also necessary to take measures to determine whether the failure that led to the power shutoff was caused by either the power supply unit or the IC memory. It is important to correctly separate the differences.

In order to eliminate these drawbacks, the present invention utilizes some or all of the functions of overvoltage detection, low voltage detection, and overcurrent detection in a power supply system that uses a data processing device as a load.
It is designed to distinguish between overload due to load side failure and power supply unit failure, and display them separately.
This will be explained in detail below.

FIG. 1 shows an embodiment of the present invention, in which 1 is an input voltage, 2 is an output voltage, and 3 is an input voltage cutoff switch, which is opened when a low voltage detection circuit 8, which will be described later, detects a low voltage.

4 is a power conversion unit that converts input voltage into a predetermined output voltage.

Reference numeral 5 denotes an overcurrent detection circuit which generates a detection signal 12 when an overcurrent flows, and gives a drooping characteristic to the output voltage to reduce the output voltage in accordance with the degree of overcurrent.

Reference numeral 6 denotes an overvoltage detection circuit which outputs a detection signal 13 when an overvoltage occurs and closes the switch 7.

8 is a low voltage detection circuit which outputs a detection signal 14 and opens switch 3 when the output voltage falls below a certain set voltage.

9 is an overload display section, and 10 is a power supply unit failure display section.

Further, 11 is the data processing device itself or a load electronic device such as an IC memory.

Hereinafter, assuming that an IC memory is used as the load 11, a power cutoff sequence due to a failure on the load side or the power supply unit side will be explained with reference to FIG.

FIG. 2 shows a cut-off sequence in the case of an overvoltage caused by a failure in the power supply unit in the configuration of FIG. 1, and the time axis is shown enlarged for convenience of explanation.

Assume that a failure occurs in the power supply unit at time t1 and the output voltage 2 begins to increase.

Then, when the output voltage reaches the threshold voltage VHX of the overvoltage detection circuit at time t2, the overvoltage detection circuit 6 operates and sends out the detection signal 13, which closes the switch 7 at high speed, causing the line voltage to rise. be forcibly suppressed.

When the switch 7 is closed, the output current increases rapidly, and at the same time t2, the output current reaches the threshold current I of the overcurrent detection circuit.
Reach X.

At this point, the overcurrent detection circuit operates, sends out the detection signal 12, gives the output a drooping characteristic, and begins to reduce the output voltage.

When the output voltage begins to drop due to the operation of the overcurrent detection circuit and reaches the threshold voltage VLX of the low voltage detection circuit at time t3, the low voltage detection circuit operates, outputs the detection signal 14, and opens the switch 3. Cut off the power.

When a low voltage occurs due to a failure within the power supply unit, the overcurrent detection circuit 5 does not operate, but the low voltage detection circuit operates, sends out a detection signal 14, and opens the switch 3 to cut off the power supply.

When an overcurrent flows due to a failure in the load electronic device, the overcurrent detection circuit 5 operates in the same way as after time t2 in FIG. 2, generates the detection signal 12, and lowers the output voltage according to the drooping characteristic.

Due to the drop in output voltage, the low voltage detection circuit operates,
The detection signal 14 is sent out, and the switch 3 is opened to shut off the signal.

Next, a method for distinguishing between a fault in the load electronic device and a fault in the power supply unit using the detection signals 12, 13, and 14 will be described.

That is, in the case of a failure in the load electronic device, the overcurrent detection circuit operates and the overvoltage detection circuit does not operate.

If there is a failure on the power supply unit side, it occurs when the overvoltage detection circuit operates, or when the overcurrent detection circuit does not operate and the low voltage detection circuit operates.

Assuming that the load side failure and the power supply unit side failure do not occur at the same time, it is obvious that the power supply unit side failure can be negated as the load side failure.

It is possible to isolate the location of the fault by using both or only one of the load side fault display and the power supply unit side fault display as the fault display.

Even in the case of a power supply having a sequence different from the power-off sequence shown in FIGS. 1 and 2, it is possible to display fault isolation.

For example, in a configuration where the switch 3 is immediately opened to cut off the power supply upon overcurrent detection, overvoltage detection, or low voltage detection, the overcurrent detection circuit will operate in the event of a fault on the load side. In the case of a failure on the power supply side, it is detected by the logical sum of when the overvoltage detection circuit operates and when the overcurrent detection circuit does not operate and the low voltage detection circuit operates.

As explained above, the present invention uses some or all of the detection signals from the overcurrent detection circuit, overvoltage detection circuit, and low voltage detection circuit of the power supply unit to display fault indications in load-side electronic devices, It is possible to display the side failure indications separately, which has the effect of clearly identifying the failure location when the power is cut off.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a configuration of an embodiment of the present invention, and FIG. 2 shows a time chart showing a power cutoff sequence at the time of overvoltage in a power supply unit. In the figure, 1 is an input voltage, 2 is an output voltage, 3 is a power cutoff switch, 4 is a power converter, 5 is an overcurrent detection circuit, 6 is an overvoltage detection circuit, γ is a short circuit switch, 8 is a low voltage detection circuit,
Reference numeral 9 represents a load-side fault display section, and 10 represents a power supply unit fault display section.

Claims (1)

[Claims] 1. In a power supply system that supplies power to an electronic device load consisting of a data processing device or a data processing device component device through a power supply unit, an overvoltage detection circuit, a low voltage detection circuit, and an overcurrent detection circuit are provided, and A fault display device is provided that distinguishes and displays a fault between a fault and a fault in the power supply unit, and the power supply is operated on the condition that the overvoltage detection circuit does not operate and the overcurrent detection circuit operates in the event of a fault in the electronic device load. A power system fault isolation method characterized in that a fault on the unit side and a fault on the electronic device load are distinguished and isolated.