JPS58123308A - Input power source controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input power supply control device, and more particularly to an input power supply control device equipped with an overcurrent protection circuit.

Generally, a plurality of power supply devices perform sequential VC operation based on power on/off of an input power supply control device.

For example, when the input power control device is powered on, a power-on instruction signal is sent in a predetermined sequence to the switching elements that supply all of the input power to each power supply device. Each power supply device is powered on by turning on a switching element that operates based on the power-on instruction signal.

On the other hand, the above-mentioned switching elements are often damaged due to short-circuit conditions.

For this reason, even though the input power supply control device issues a disconnection instruction, the load side (power supply device) remains energized, creating a risk of electric shock to the human body. Furthermore, when the power is turned on, the power to the load, which should normally be sequentially turned on, and the load corresponding to the faulty switching element are turned on at the same time. In other words, this increases the burden on the input power control device.

However, in the case of a fault lamp that is damaged due to a short-circuit condition of the above-mentioned switching element, the load side does not generate an overcurrent and is energized at a predetermined voltage, so that the protection circuit for the load does not operate in any way. Therefore, the above-mentioned electric shock to the human body and the burden on the power supply control device remain unsolved.

The present invention focuses on the problems in the first half, and aims to forcibly operate the pupil-keeping circuit and issue a power-off instruction. Therefore, there is a power-on detection signal that notifies the user that power has been turned on to the load side, and an output voltage detection signal from the output voltage detection circuit that detects the output voltage of the power supply unit connected after the above-mentioned switching element. The main feature is that when there is a mismatch, a disconnection instruction is forcibly given to the protection circuit.

A detailed explanation will be given below based on one drawing.

FIG. 1 shows a block diagram of a conventional input power supply control device, in which 1 is an input power supply control device, 2 is a power on/off control circuit, 3 is a protection circuit, po and pn are switching elements, Ro-Rn It is a load.

In the figure, a predetermined AC input power source AVij is outputted to each of loads RO to Rn via a protection circuit 3. Here each load R
For O to an, the above-mentioned AC input power supply AV is connected to the switching element P.
The switching elements PO to Pn are inputted by the operation of O to Pn.
operates in a predetermined sequence based on the operation of the power on/off control circuit. For example, when the power is turned on, each of the switching elements Po to Pnti is powered on in a predetermined sequence by the power-on instruction signal MO to Mn1C of the power-on/cut control circuit described above.

On the other hand, if the above-mentioned switching element is damaged in a short-circuited state, the switching element that generates the faulty sound due to the shorted state? Therefore, there is a risk of electric shock to the human body, for example, in the circuit 811!1, etc., which is the load in the energized state.

Also, when the power is turned on later, each switching element is originally set to sequence 7.
At least two switching elements, which should be powered on at the same time, are powered on at the same time. That is, this also causes an increase in the burden on the power on/off control circuit. However, on the load side, no current flows and no circuit failure is detected, so the protection circuit 3 does not operate. That is, there is a problem 1 in that it is difficult to detect a short-circuited fault in a switching element.

FIG. 2 shows a block diagram of an input power control device according to an embodiment of the present invention, and 2' indicates a discrimination circuit 4 and a power on/off instruction circuit 6 that generates a power on detection signal to notify that the power has been turned on. Power on/off control circuit with 0O-On
e! The output voltage detection circuit and other circuits are the same as in FIG. 1.

In the figure, the AC input power supply AV is passed through the protection circuit 31r,
A predetermined input power is output to the loads RO to an by turning on the switching elements PO to Pn, which operate in a predetermined sequence in accordance with the operation of the power on/off control circuit 2'. The power on/off control circuit 2' includes a power on/off instruction circuit 5 and a discrimination circuit 4. The power on/off instruction circuit 5 instructs each switching element PQ, Pn to turn on/off the power, and When the power is turned on, a power-on instruction is issued, and a zero power-on instruction signal N'ft, which means a friend, is output to the discrimination circuit 4.

Further, the discrimination circuit 5 includes output voltage detection circuits Oo to 0nI.
It is detected from the signal that input power is being supplied at C. Here, for example, if the output voltage is detected in the output voltage detection circuit Oo~On even though the power on/off control circuit 2' is instructing the power on, the above-mentioned discrimination circuit 4 Instructs the power supply to be turned off and forcibly cuts off all power supply. The points to note here are:
In the discrimination circuit 4 provided in the power on/off control circuit, the power on detection signal N and the output voltage detection circuit OO~On are detected.
The above-mentioned power-on detection signal N
A mismatch between the signal and the signal means a short-circuit failure in the switching element.

As described above, according to the present invention, all short-circuit faults in switching elements can be detected by comparing the power-on detection signal with the signal from the output voltage detection circuit. Achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional input power control device, and FIG. 2 is a block diagram of an input power control device of an embodiment of the present invention.

Claims (1)

[Claims] A maintenance circuit that cuts off the power in the event of an abnormality 1wI In an input power supply control device that includes a switching element that turns on and off the input power inputted through the maintenance circuit and a power supply control circuit that operates the switching element, the above-mentioned switching A power on/off instruction circuit having means for sending a power on detection signal for notifying that power on of the element has been instructed, detecting the output voltage of a power supply unit connected as a load after the above-mentioned switching element; An output voltage detection circuit for notification and a disconnection instruction signal for operating the above-mentioned maintenance circuit when the output voltage detection signal outputted from the output voltage detection circuit and the above-mentioned power-on detection signal do not match. An input power supply control device characterized in that it is equipped with a discrimination circuit.