JPH04322139A - Power supply control signal converting system - Google Patents

Abstract

PURPOSE:To prevent erroneous detection on the side of host power supply controller that power is turned ON for a device to be controlled when a control cable is disconnected or not yet connected between a power supply control signal converter and the device to be controlled. CONSTITUTION:When a power supply control signal converter 2 receives a power supply control signal from a power supply controller 1 and transmits a power turn ON signal to a device 4 to be controlled, a feedback signal identifying unit 7 identifies a signal fed back from the device 4 to the converter 2 and measures the time elapsed before detection of the feedback signal. When the measured time deviates from a predetermined time range, a tin comparator 9 detects abnormal connection of a control cable 5 between the converter 2 and the device 4 and a detection signal is fed to the power supply controller 1 which then confirms the connecting state of the control cable 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a power supply control signal conversion method for controlling a lower-order controlled device by a higher-order power supply control device, and in particular to control of various electronic devices including information processing devices as controlled devices. This invention relates to a power supply control signal conversion method for performing the following.

0002

[Prior Art] A power supply control signal conversion device is disposed between a power supply control device and a lower-level controlled device that is controlled by this device, and converts a power-on signal from the power supply control device to a specified controlled device. When the signal is sent to the device, the conversion device sends a power-on completion signal back to the power supply control device. This allows the higher-level power supply control device to detect that the controlled device is in a power-on state. However, with conventional power supply control signal conversion methods, even if the control cable between the converter and the controlled device is disconnected or unconnected, when the converter receives the power-on signal, the power-on completion signal is sent to the power source. The information is sent to the control device, and the power supply control device detects that the lower controlled device is in a power-on state.

0003

[Problem to be Solved by the Invention] In this way, in the conventional power supply control signal conversion method, even if the control cable is not connected, when the conversion device receives a power-on signal, it sends back a power-on completion signal. The power supply control device erroneously detected that the controlled device was in the power-on state, even though the lower-level controlled device was not actually in the power-on state.

[0004] The present invention was proposed in order to solve the problems of the conventional technology, and is intended to solve the problems that occur when the control cable between the power supply control signal converter and the controlled device is disconnected or disconnected. In some cases, it is an object of the present invention to provide a power control signal conversion method that prevents a higher-level power control device from erroneously detecting that a controlled device is in a power-on state.

[0005]

[Means for Solving the Problems] In order to achieve this object, the power supply control signal conversion method according to the present invention is arranged between a higher-order power supply control device and a lower-order controlled device, and is capable of controlling the power supply from the power supply control device. In the power control signal conversion device, which converts the signal into a signal for controlling a controlled device when a signal is received, and transmits the converted power control signal to the controlled device to perform control, the power control When the power control signal converter that receives the power control signal from the device sends a power-on signal to the controlled device, the presence or absence of a feedback signal sent back from the controlled device to the power control signal converter. feedback signal identification means for identifying the feedback signal; Cable connection abnormality detection means detects a connection abnormality of a control cable between the power supply control signal converter and the controlled device when the time measured by the time measurement means does not satisfy a specified time range. The detection output of this cable connection abnormality detection means is sent to the power supply control device, and the connection state of the control cable is detected by the power supply control device.

[0006]

[Operation] According to the above-described configuration, if the feedback signal in response to the power-on signal is not returned from the controlled device to the converter within a specified time, the power supply control device detects that there is an abnormality in the connection of the control cable. Can be done.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the power supply control signal conversion method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an embodiment of a power supply control signal conversion device constructed using this power supply control signal conversion method. FIG. 1(A) shows a state in which a control cable between a power supply control converter and a controlled device is connected, and FIG. 1(B) shows a state in which this control cable is not connected.

In FIG. 1A, the upper power supply control device 1 and the power supply control signal conversion device 2 are connected by a signal cable 3 between the connectors CN1 and CN2, and the conversion device 2 and the lower order controlled device 4 are connected by a signal cable 3. A control cable 5 connects connectors CN3 and CN4. A power-on signal S1 sent from the power supply control device 1 is transmitted to the controlled device 4 via the control cable 5 via the signal converter 6 inside the conversion device 2.
sent to. At this time, the feedback signal S3 is sent back from the controlled device 4 to the feedback signal identifier 7 in the conversion device 2 via the control cable 5. Note that the power-on signal S2 from the signal converter 6 is also supplied to the signal selector 8, feedback signal discriminator 7, and time comparator 9 in the converter 2.

Here, when the terminal T1 of the connector CN3 on the converter 2 side is grounded and the control cable 5 is connected, a low level ("L" level) signal is sent to the control cable 5.
and the converter 2 via the connector CN4 on the controlled device 4 side.
Since the signal is turned back to the side, the control input terminal of the signal selector 8 becomes "L" level (ground level), and the selector 8 is in an inoperative state.

The feedback signal discriminator 7 compares the feedback signal S3 sent from the controlled device 4 with the power-on signal S2 from the signal converter 6, detects the power-on signal S2, and then performs signal conversion. Even if the sufficient time Xs required for the signal to travel back and forth between the controller 6 and the controlled device 4 has elapsed, the feedback signal S
3 cannot be detected, it is determined that the control cable 5 has been disconnected, and a cable disconnection error signal S4 is sent to the power supply control device 1.

Furthermore, if the feedback signal S3 is detected within this fixed time Xs after the power-on signal S2 is detected,
A comparison feedback signal S5 is output from the signal discriminator 7 to the time comparator 9. This time comparator 9 detects the comparison power-on signal S2 from the converter 6 and then uses the time
Comparison feedback signal S5 after elapse of a certain time Xs longer than t
When detected, it is determined that the control cable 5 is normally connected, and a comparison output S6 is output to the signal converter 6. As a result, the signal converter 6 outputs a power-on completion signal S7.
is sent to the power supply control device 1, and normal control is performed.

On the other hand, when the control cable 5 is disconnected from the connector CN3 as shown in FIG. 1(B), a high level (
Since the "H" level signal is added, the signal selector 8 sends the power-on signal S2 from the converter 6 to the discriminator 7 as the selection signal S8. The signal discriminator 7 sends a discrimination output S9 to the time comparator 9 when the power-on signal S2 from the converter 6 and the selection signal S8 from the selector 8 are detected. The time comparator 9 outputs the discrimination output S9 from the discriminator 7 within a certain time Xt required for the signal to pass through the selector 8 after the power-on signal S2 from the converter 6 is detected.
When detected, a cable disconnection error signal S4 is sent to the power supply control device 1. As a result, in the power supply control device 1,
It is possible to detect that the control cable 5 is disconnected or unconnected.

[0013]

[Effects of the Invention] As explained above, according to the present invention, the power supply control device side can determine whether the control cable between the power supply control signal conversion device and the controlled device is disconnected or disconnected. It is possible to eliminate the problem of erroneously detecting that the controlled device is in a power-on state when there is an abnormality in the connection of the control cable, and improve the reliability of the device.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a device embodying the power control signal conversion method according to the present invention, in which (A) shows a state in which a control cable is connected, and (B) shows a state in which the control cable has fallen off. Indicates the condition.

[Explanation of symbols]

1 Power control device 2 Power control signal conversion device 3 Signal cable 4 Controlled circuit 5 Control cable 6 Signal converter 7 Feedback signal identifier 8 Signal selector 9 Time comparator

Claims (1)

[Claims] Claim 1: Disposed between a higher-level power supply control device and a lower-level controlled device, when receiving a power control signal from the power supply control device, converts this signal into a signal for controlling the controlled device. In the power control signal converting device that transmits the converted power control signal to the controlled device to perform control, the power control signal converting device that receives the power control signal from the power control device converts the power on signal into a power-on signal. a feedback signal identifying means for identifying the presence or absence of a feedback signal sent back from the controlled device to the power supply control signal conversion device when transmitted to the controlled device; A time measuring means for measuring the time from transmission until the feedback signal is detected by the feedback signal identifying means, and if the time measured by the time measuring means does not satisfy the specified time range, the power source cable connection abnormality detection means for detecting a connection abnormality of a control cable between the control signal conversion device and the controlled device; a detection output of the cable connection abnormality detection means is sent to the power supply control device; A power control conversion method characterized in that a power control device detects the connection state of the control cable.