JPH05137257A - Power supply control signal converter - Google Patents

Abstract

PURPOSE:To prevent a false detection of a power supply cut-off condition of a device to be controlled due to the cut off of a control cable. CONSTITUTION:A power supply control signal converter 2 which converts a power supply control signal from a host power controller 1 to a control signal and sends it to a subordinate device to be controlled 3 is installed. A feedback signal recognizer 9 transmits a power supply cut-off signal to the device to be controlled 3 and recognizes the existance of a feedback signal which is fed back to the converter 2. A time comparator 8 counts the time from the transmission of the cut-off signal to the reception of the feedback signal. It detects a connection abnormality when the counted value is not within the specified frame of time.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a power supply control signal converter for controlling various electronic devices such as information processing devices and communication devices.

[0002]

2. Description of the Related Art In a conventional power supply control signal conversion system, when a control cable is disconnected or not connected between a conversion device and a controlled device, a power supply disconnection signal from a higher power supply control device to a designated controlled device is provided. When the conversion device receives, the conversion device transmits a power-off completion signal to the upper power supply control device. This transmission detects that the lower controlled device is in a power-off state.

However, in response to the above-mentioned power-off completion signal, the upper power supply control device erroneously thinks that the lower controlled device is in the power-off state even though the lower controlled device is not actually powered off. It has the drawback of detecting it.

[0004]

OBJECTS OF THE INVENTION The object of the present invention is to eliminate the above mentioned drawbacks,
It is an object of the present invention to provide a power supply control signal conversion device capable of preventing erroneous detection of a power-off state of a controlled device by a control cable.

[0005]

A power supply control device of the present invention is a power supply control signal conversion device for converting a power supply control signal from a higher-order power supply control device and outputting it as a control signal for controlling the operation of a controlled device. Identification means for recognizing the presence or absence of a feedback signal returned from the control signal conversion device to the controlled device to the power supply control signal conversion device via the controlled device, and to the controlled device. Measuring means for measuring the time from the transmission to the identification signal of the feedback signal "present" in the identifying means, and the power supply control signal if the measured value in this measuring means does not satisfy the specified time range. And a control device for detecting a connection abnormality between the controlled device and the controlled device.

[0006]

An embodiment of the present invention will now be described in detail with reference to the drawings.

Referring to FIG. 1A, a system to which an embodiment of the present invention is applied is that a power supply control device 1 for transmitting a power supply control signal and a power supply control signal for converting a signal from this device 1 are used. The converter 2 and the controlled device 3 that receives and controls the power supply control signal converted by the converter 2 are included.

The upper power supply control device 1 transmits a disconnection signal 4 for disconnecting the control cable between the power supply control signal converting device 2 and the controlled device 3 or confirming the unconnected state.

The power supply control signal conversion device 2 is a converter 7 for converting the disconnection signal 4 from the upper power supply control device 1 into a power supply disconnection signal 11, and a feedback signal given from this converter 7 via the controlled device 3. A feedback signal discriminator 9 for comparing the power supply disconnection signal 11 directly supplied from the converter 7 and the presence or absence of the feedback signal 10 is provided.

This feedback signal discriminator 9 has a power-off signal 1
It is determined whether or not the feedback signal 10 is given within a fixed time xs after detecting 1. This constant time xs means a sufficient time required for a signal to reciprocate between the power supply control signal conversion device 2 and the controlled device 3. When there is no feedback signal 10 within this fixed time xs, the feedback signal discriminator 9 determines that the control cable is in a disconnected or unconnected state, and sends a cable disconnection error signal 6 to the upper power supply control device 1. When the feedback signal discriminator 9 determines that the feedback signal 10 is present within the fixed time xs, the feedback signal 12 for comparison is output.

The time comparator 8 in the power supply control signal converter 2 has a comparison feedback signal 12 returned from the converter 7 via the controlled device 3 and a comparison power supply disconnection signal 11 directly supplied from the converter 7. Compare with. The time comparator 8 is
When the comparison feedback signal 12 is detected after a lapse of a fixed time xs after the comparison power supply disconnection signal 11 is detected, it is determined that the cable is normally connected, and the power supply disconnection completion signal 5 is sent via the converter 7 to the upper level. It is transmitted to the power supply control device 1. In this way, the power-off of the controlled device 3 is confirmed and normal control is performed.

Next, the operation when the control cable between the power supply control signal converter 2 and the controlled device 3 is disconnected from the converter 2 will be described in detail with reference to FIG.

Referring to FIG. 1B, the selector 13 in the power supply control signal converter 2 does not operate when a signal at the ground level is applied. Therefore, when the control cable is connected, the signal of the ground level is given to the selector 13, so that it does not operate. As shown, when the control cable is disconnected from the converter 2, the selector 13 is given a high level signal.

The selector 13 transmits the feedback signal 10 in response to the high level signal. In response to this signal 10, the feedback signal discriminator 9 outputs a comparison feedback signal 12.

The time comparator 8 determines whether or not the comparison feedback signal 12 is given within a fixed time xt from the detection of the comparison disconnection signal 11. This fixed time xt is the feedback signal 1
0 means a sufficient time required for the time comparator 8 to receive it via the selector 13.

When the time comparator 8 detects the comparison feedback signal 12 within the fixed time xt, the time comparator 8 supplies the cable disconnection error signal 6 to the upper power supply controller 1.

In this way, it is possible to determine whether the control cable is disconnected or not connected.

[0018]

According to the present invention, the fact that the control cable between the conversion device and the controlled device is disconnected or unconnected is converted by identifying the feedback signal and comparing the power-off signal with the comparison feedback signal. It is possible to improve the reliability of the controlled device and the conversion device by detecting with the device.

[Brief description of drawings]

FIG. 1A is a diagram showing a state in which a control cable is connected in a system to which an embodiment of the present invention is applied;
FIG. 6B is a diagram showing a state in which the control cable is not connected in the system to which the embodiment of the present invention is applied.

[Explanation of symbols]

 1 power supply control device 2 power supply control signal conversion device 3 controlled device 4 power supply disconnection signal 5 power supply disconnection completion signal 6 cable disconnection error signal 7 signal converter 8 time comparator 9 feedback signal discriminator 10 feedback signal 11 comparison power supply disconnection signal 12 Feedback signal for comparison 13 Selector

Claims (1)

[Claims] 1. A power supply control signal conversion device for converting a power supply control signal from a higher-order power supply control device and outputting it as a control signal for controlling the operation of the controlled device. Identification means for recognizing the presence or absence of a feedback signal returning from the power-off signal to the power-supply control signal conversion device via the controlled device, and feedback from the identification device to the controlled device Signal "Yes"
Measuring means for measuring the time until receiving the identification signal of
When the measured value by the measuring means does not satisfy the specified time range, the measuring means includes a detecting means for detecting a connection abnormality between the power source control signal and the controlled device or in the device. Power control signal converter.