JPH0215322A - Fan connection state detecting system - 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] [1 Already Required] Regarding a fan connection state detection method for determining the connection state of a cooling fan attached to maintain a good environment for information processing equipment, etc., The purpose of the present invention is to make it possible to distinguish between a state in which the fan is not connected and a state in which the fan itself is malfunctioning with a single signal line, and a rotation pulse detection means for detecting rotation pulses of the fan;
The apparatus includes an oscillator with a higher frequency than the rotation pulse, and a gate means for synthesizing the rotation pulse and the high frequency, and is configured to output the synthesized signal as a pulse output.

[Field of Industrial Application] The present invention relates to a fan connection state detection method for determining the connection state of a cooling fan attached to an information processing device, etc. in order to maintain a good environment. The present invention relates to a fan connection state detection method that can distinguish between cases where no fan is present and cases where the fan itself is malfunctioning.

[Conventional technology]

Information processing devices that use computers are equipped with various auxiliary devices to maintain good environmental conditions, one of which is a cooling fan. A device equipped with a cooling fan is generally provided with a fan rotation detection device in order to know whether the fan is properly connected or whether the fan is malfunctioning.

FIG. 3 is a configuration diagram showing an example of such a fan rotation detection device, and FIG. 4 is a waveform diagram of signals at each part thereof. As shown in both figures, the rotation pulse detection means 1 detects a pulse signal S1 generated by the rotation of the fan, and outputs it to the determination circuit 4 via the gate means 2 and 3. When the fan and the determination section are connected, the input signal to the determination circuit 4 becomes a pulse corresponding to the pulse signal S1 as shown in the waveform S2 in FIG. 4, but if the connection is broken, As shown in waveform S2' in Fig. 4, "old gh" continues,
If the fan is mechanically malfunctioning, the S2
11 or "Low" continuously, and the connection state can be determined from this.

[Problem to be solved by the invention]

By the way, when optional equipment is added to an information processing apparatus, a cooling fan for the optional equipment is also usually an option. If the confirmation at the time of delivery is insufficient, the connection portion shown in FIG. 3 may not be confirmed, and in some cases, the user may not be aware that the fan side shown in FIG. 3 is missing.

On the other hand, in the conventional circuit configuration shown in FIG. 3, the waveform 3 shown in FIG.
There is a possibility that it will be a continuation of "old gh" like 2', so
The operator may misunderstand that the fan is not connected when it is mechanically damaged, or vice versa (
If 32" remains low continuously, it can be determined that the fan has failed).

The present invention was created in view of these problems, and
It is an object of the present invention to provide a fan connection state detection method that can distinguish between a normal state, a state in which a fan is not connected, and a state in which the fan itself is broken using one signal line.

[Means to solve the problem]

Means for solving the above-mentioned problems in the present invention is a fan connection state detection method that determines the connection state of the fan based on the presence or absence of pulse output accompanying rotation of the fan. The fan connection state detection method is provided with an oscillator with a frequency higher than that of the rotation pulse, and a gate means for synthesizing the rotation pulse and the high frequency, and in which the synthesized signal is used as a pulse output.

[Effect]

In the present invention, an oscillator is provided that generates a pulse having a sufficiently shorter period than the rotation pulse of the fan, and a signal obtained by AND-synthesizing the high frequency and the rotation pulse of the fan using a gate is sent to the determination circuit.

When the fan is rotating normally, a group of high-frequency pulses is input to the determination circuit at a constant cycle, but when the fan fails, it becomes a continuous "Low" or a continuous high-frequency pulse, and if it is not connected Since the 'high' sequence is input, the determination circuit can distinguish between the two.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram showing an example of a fan connection state detection device embodying the present invention, and FIG. 2 is a waveform diagram of signals at each part thereof. In FIG. 1, reference numeral 9 and 1 are rotational pulse detection means, 2 and 3 are gate means, 4 is a determination circuit, and 5 is an oscillator.

The rotation pulse detection means 1 detects pulses accompanying rotation of a fan (not shown). The gate means 2 synthesizes the rotation pulse signal S1 and the high frequency signal S3 outputted from the oscillator 5 to generate 1. A signal 31' is output. The determination circuit 4 determines the connection state of the fan based on the signal S2 input from the connection portion via the gate means 3. The oscillator 5 oscillates a pulse S3 having a higher frequency than the rotation pulse of the fan. An oscillator 5 is specially added according to the present invention, and accordingly, the gate means 2 plays the role of combining the signal S1 and the signal S3. The functions of the other means are almost the same as in the conventional example shown in FIG.

As shown in FIGS. 1 and 2, normally, the rotation pulse detection means 1 detects a pulse signal S1 generated by the rotation of the fan.
is detected, the oscillator 5 oscillates a pulse S3 having a higher frequency than that frequency, and the gate means 2 AND-synthesizes them, and a waveform like the signal S1° shown in FIG. 2 is output. Therefore, the signal inputted to the determination circuit 4 via the gate means 3 becomes a group of high-frequency pulses with a constant period, like the signal S2 shown in FIG.

When the connection is not made, there is no signal at the connected portion, so the signal input to the ζ determination circuit 4 through the gate means 3 becomes a continuous low signal as shown in the waveform S2' in FIG.

If the fan itself is faulty, Sl will be “II i
g h” or It L O, I”, so
The signal input to the determination circuit 4 is the signal S2'' shown in FIG.
As shown in FIG. 3, it becomes a high frequency continuity or a "old ghl" continuity, so it can be distinguished from the continuity of =l i, 0. +1 in the case of no connection, and the determination circuit can distinguish between the two.

[Effects of the Invention] As described above, according to the present invention, fan connection state detection is possible in which a normal state, a state in which the fan is not connected, and a state in which the fan itself is malfunctioning can be distinguished with one signal line. method can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a signal waveform diagram of the embodiment, FIG. 3 is a block diagram of a conventional example, and FIG. 4 is a signal waveform diagram of a conventional example. 1; Rotation pulse detection means; 2.3; Gate means; 4; Judgment circuit; 5: Oscillator.杢-Ne 3 meeting 1.1) - Ichibun de Hosuke Yupa (Node=Door Ei,
;2 1st figure si')・1;Stop, Moeto Masaru [Agency Jij, +, j-2nd figure Iso 禾い(of the next bribe・of the hypocenter U 1 Oh come ten a! no I residence” -2, De Saichi 2 Figure 4

Claims (1)

[Claims] In a fan connection state detection method that determines the connection state of a fan based on the presence or absence of pulse output accompanying rotation of the fan, rotation pulse detection means (1) for detecting rotation pulses of the fan is provided.
), an oscillator (5) with a higher frequency than the rotation pulse, and gate means (2) for synthesizing the rotation pulse and the high frequency, the fan connection state characterized in that the synthesized signal is output as a pulse. Detection method.