JPS60236410A - Switch operating state detector - 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 (Field of the Invention) The present invention relates to a switch operating state detection device for detecting the operating state of a switch.

(Problems with the prior art) Wirelessly measuring the operating status of a switch at a slightly distant position is often required in the field of automatic control and other fields. There are methods to electrically detect the switch operating state and detect the switch operating state based on the detection output, and methods to optically detect the switch operating state.The former method detects the switch operating state based on the detection output. The latter requires a power source for the detection output, and the latter has the disadvantage that the detection function deteriorates due to dirt on the optical system, contamination of the atmosphere, etc. In addition, in either method, the structure is complicated. Manufacturing costs are becoming high.

(Object of the invention) The present invention has been made in view of the above circumstances, and includes:
The object of the present invention is to provide an excellent switch operation state detection function, a simple structure, and a reduction in manufacturing costs.

(Configuration and Effects of the Invention) In order to achieve such an object, the present invention includes a switch whose operating state is to be detected, a capacitor and a switch-side coil connected in series with the switch,
When the switch is closed, a resonant circuit is formed by the capacitor and the switch-side coil, and the resonant circuit is a switch that oscillates at a predetermined resonant frequency due to a voltage induced in the switch-side coil by electromagnetic induction. a unit, a detection side coil, and an excitation circuit that is connected in parallel to the detection side coil to excite the detection side coil and a detection circuit that detects the induced voltage of the detection side fill, and the excitation circuit is The detection side coil is excited by an excitation output having a frequency corresponding to the resonance frequency, and the detection circuit detects a voltage induced in the detection side fill by electromagnetic induction via the switch side coil after the excitation is stopped. and a detection unit that detects the operating state of the switch in the switch unit.

According to the present invention, the switch unit does not require a separate power source to detect the operating state of the switch, and unlike optical detection methods, there is no deterioration in functionality due to environmental pollution. In addition to improved reliability, the structure is simple, making it possible to reduce manufacturing costs.

(Description of Examples) Hereinafter, the present invention will be described in detail based on examples shown in the drawings. FIG. 1 is a schematic configuration diagram of a switch operation state detection device according to an embodiment of the present invention.

The device of this embodiment includes a switch unit 1 and a detection unit 2.

The switch unit 1 includes a switch 5 whose open or closed operating state is to be detected, a capacitor 4 and a switch-side coil 3 connected in series with the switch 5. In this switch unit 1, the switch 5
When closed, a resonant circuit is formed by the capacitor 4 and the switch-side coil 3, and the resonant circuit is induced in the switch-side coil 3 by electromagnetic induction via the detection-side coil 6, which will be described later. It oscillates at a predetermined resonant frequency due to the applied voltage. In this case, the circuit formed by the capacitor 4 and the switch side coil 3 constitutes a resonant circuit having a predetermined resonant frequency when the switch 5 is closed, but the resistance in this resonant circuit is The internal resistance of the coil 3 is substituted. However, instead of this internal resistance, a resistor may be inserted in the switch side coil 3 in series.

The detection unit 2 is connected in parallel to the inspection-side coil 6 and the detection-side filter 6, respectively, and includes an excitation circuit 7 that excites the pressure-detection-side coil 6 and a detection circuit that detects the induced voltage of the detection-side coil 6. A circuit 8 is provided. Excitation circuit 7
Excites the detection side coil 6 with an excitation output having the same frequency as the resonance frequency of the resonance circuit. The detection circuit 8 detects whether the switch 5 is closed by detecting the induced voltage of the switch-side coil 3 in the resonance circuit after the detection-side coil 6 has stopped excitation.

Next, the operation will be explained with reference to the signal waveform diagram of each part in FIG.

(A) When the switch 5 in the switch unit 1 is closed: In this case, the switch unit 1 has the switch side coil 3
The closed circuit formed by the capacitor 4 and the switch 5 constitutes the resonant circuit. In such a state, the detection unit 2
The excitation circuit 7 is activated. The excitation circuit 7 intermittently outputs excitation output at a frequency corresponding to the resonance frequency of the resonance circuit, as shown in FIG. 2(,).

In this case, the excitation output has an alternating current waveform, but in FIG. 2(a), for convenience of illustration, only a part is shown as an alternating current waveform and the rest is shown as a rectangular waveform. Note that this is shown in Figure 2 (e).
The same applies to The detection side coil 6 is excited by such excitation output. However, in the above case (A), the switch 5 is closed in the switch unit 1, and the resonant circuit is thereby configured, so the excitation output of the excitation circuit 7 shown in FIG. 2(a) The resonant circuit oscillates due to the induced voltage induced in the detection side coil 6, and as a result, the switch side coil 3 has a voltage as shown in Fig. 2 (e).
) An induced voltage with a waveform as shown in the figure is generated. The frequency of the induced voltage in the switch-side coil 3 corresponds to the frequency of the resonant circuit. Next, this induced voltage gradually decreases after the excitation of the magnetic dynamic circuit 7 is stopped, but an induced voltage is generated in the detection side coil 6 by the induced voltage until this induced voltage decreases. This induced voltage in the detection side coil 6 is detected by the detection circuit 8. The detection circuit 8 detects, based on the induced voltage of the detection side coil 6, that the operating state of the switch 5 in the switch unit 1 is in the state (A).

(B) Switch 2) When the switch 6 in 1 is open: In this case, no resonant circuit is formed in the switch unit 1, so even after the excitation is stopped, the detection side coil 6 As shown in FIG. 2(b), no induced voltage is generated, so the detection circuit 8 detects that the switch 5
It is detected that the operating state of is in the state (B).

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment of the present invention, and FIG. 2 is a signal waveform diagram of each part to explain the operation of the apparatus. 1 is a switch unit, 2 is a detection unit, 3 is a switch side fill, 4 is a capacitor, 5 is a switch, 6 is a detection side coil, 7 is an excitation circuit, and 8 is a detection circuit. Applicant Tateishi Electric Co., Ltd. Representative Patent Attorney Kazuhide Oka 1)

Claims (1)

[Claims] (1) A switch whose operating state is to be detected, a capacitor and a switch-side coil connected in series with the switch, and when the switch is closed, a resonant circuit is created by the capacitor and the switch-side coil. The resonant circuit includes a switch unit that oscillates at a predetermined resonance frequency due to a voltage induced in the switch coil by electromagnetic induction, a detection coil, and a detection coil connected in parallel to each other, The excitation circuit includes an excitation circuit that excites the detection side coil and a detection circuit that detects an induced voltage of the detection side fill, and the excitation circuit excites the detection side fill with an excitation output of a frequency corresponding to the resonance frequency. After the excitation is stopped, the detection circuit detects the switch via the switch side coil.
1. A switch operating state detection device comprising: a detection unit that detects the operating state of a switch in a switch unit by detecting the operating state of a switch within the switch unit.