JP2515111B2 - Automatic door controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device for an automatic door, and more particularly to a control device for stabilizing the operation.

(Technical background of the invention and its problems) Conventionally, as shown in FIG. 3, a sensing unit (electronic mat) 5
In the automatic door control device that is driven by the oscillator of the control unit 53 that is separate from the 1, 52,
Is drawn by a feeder 54 such as a coaxial cable to the door 55 without drawing it, but the length of the feeder 54 becomes a problem due to the structure of the building. In other words, since the circuit system is adjusted with the length of the feeder 54 kept constant at the time of manufacture, the length could not be changed by cutting the feeder 54 at the actual installation site. If the feeder is cut at the installation site, the length of the cable will change and the parameters used during adjustment will change, and reliable door opening and closing operations cannot be performed.Therefore, it is necessary to adjust the circuit system on site each time. there were. Here, there has been a problem that such adjustment work is difficult unless there is some electrical knowledge, and the work is extremely complicated due to the environment of the installation place. Even if it is not, if the sensing plate is buried in the ground, there is a disadvantage that the same adjustment as above is required due to the influence of the mortar and the like around it.

That is, in this type of door control device, a pair of sensing plates 51 and 52 are regarded as capacitors to form a bridge circuit, and the capacitance of a variable capacitor forming one side of the bridge circuit is adjusted to achieve an electrical balance. Taking advantage of the fact that the capacity of the sensing plate changes when a person approaches the sensing unit, a signal is taken out when the balance is lost to perform a switching operation, and the door 55 is opened and closed. However, even in this device, when the length of the feeder is changed or the environment is changed, the capacity of the built-in variable capacitor must be readjusted, and the adjustment work is extremely complicated. was there. In addition, the sensing plates 51 and 52 and the feeder 54 are tuned with a capacitor as a part of the resonator, and when a person approaches the sensing unit, it is detected that the Q and frequency of the tuning circuit of the oscillator change, and the door is opened. There are also those that are controlled to open and close. However, this control device also has a drawback that the capacitance of the capacitor incorporated in a part of the resonator must be readjusted when the length of the feeder changes or the environment changes.

As an automatic door control device which solves such a drawback, there is, for example, one disclosed in Japanese Patent Application No. 60-221505 by the present applicant.

FIG. 4 shows this automatic door control device. Between the two embedded sensing plates 1 and 2 forming the sensing part 5 and the oscillating part 20, an impedance converter 3 to be described later and an impedance converter 3 to be described later are provided. The in-phase current blocking choke coil 4 and the feeder 10 such as a coaxial cable are connected in series. The output of the oscillating unit 20 (with a frequency of about 1 to 20 MHz) is detected by the detecting unit 21.
Automatic recovery type DC amplifier as shown in JP-A-60-34293
30 is connected, the change of the capacitance and Q of the sensing plates 1 and 2,
In other words, the door open / close signal is detected by detecting the proximity or separation of the human body.
It is designed to output DRC. The input of the oscillating unit 20 is connected to the common potential via the capacitor C1 and the varicap VC, and the output DS of the detecting unit 21 is input to the window comparator 50 forming the voltage adjusting circuit. The comparator 50 is composed of a comparator 51 that sets a minimum value, a comparator 52 that sets a maximum value, and a NOR gate 53 that takes the logical product of the outputs of the comparators 51 and 52, and the thresholds of the comparators 51 and 52 are It is set to a positive / negative value within a predetermined range. And the window comparator
The output CSA of 50 is input to the set terminal of the flip-flop 60, the set output ST of the flip-flop 60 is input to the AND circuit 71 together with the clock pulse CP from the pulse oscillator 70, and the clock pulse CP passing through the AND circuit 71 is binary. Input to the clock terminal of the counter 72. counter
The output of 72 (Q _{1 to} Q _n ) is a ladder circuit of resistance 2R and resistance R
It is designed to be converted, and this DA conversion value is the resistance R30.
After that, it is applied to the varicap VC.
A reset signal RS is input to the flip-flop 60 and the binary counter 72, and the reset signal RS is output when the power is turned on and when the reset button is pressed. Further, the reset output RO of the flip-flop 60 is given to the amplifier 30 so that the amplifier 30 does not operate when the flip-flop 60 is set, that is, when the counter 72 is operating.

Here, the choke coil 4 is a line having the same characteristic impedance as the feeder 10, the two sensing plates 1 and 2 are equivalent to capacitors, and a resonance coil and a resonance capacitor are provided at the tip of the feeder 10. Since they are connected in series, the sensing shown in FIG. 4 is as shown in FIG. Figure 5 of the feeder examining the relationship between the impedance Z _a for the line length l (hereinafter, the coaxial cable and) 10 of the inlet portion, so that the solid line in FIG. 6.

Now, for convenience of explanation, assuming that the capacitance C _c is just a value of Z _o = X _c , the solid line characteristics shown in FIG. 6 are obtained, so the series resonance frequency is λ / 8 and the parallel resonance frequency is 3/8. It is in λ. Since parallel resonance is good when used as a human body sensor for an automatic door, if the length l of the coaxial cable 10 is determined, the parallel resonance frequency f _{o1 of} this circuit system is determined. At this frequency, as shown in FIG.
The oscillation frequency f _{o of} 20 is brought close to the above-mentioned frequency f _o1 of the sensing unit 5, and the influence of the proximity of the sensing unit 5 to the human body, that is, the frequency, by the capacitor couple of FIG. The deviation of f _o1 or the decrease of Q is given to the oscillating unit 20, and the oscillating unit 20 changes the oscillation output.
The same applies when the oscillation frequency f _o is fixed and the length of the coaxial cable 10 is variable.

By the way, the automatic door has various sizes of the sensing plate according to the size of the door entrance, and cannot be used as a pure capacitor for burying the sensing plate under the floor. There is a problem that it changes depending on the burial site.

Therefore, the resonance coil L and the resonance capacitor C as shown in FIG. 5 are provided. That is, by inserting the resonance coil L in series, in the capacitive portion of the reactance characteristic (0 to λ / 8, 3/8 · λ to 5/8 · λ, etc.),
The series resonance frequency f _s is affected to decrease the series resonance frequency f _s . By inserting a capacitor C that does not affect the parallel resonance frequency f _p in parallel, the inductive portion of the reactance characteristics (λ / 8 to 3/8 · λ, 5/8 · λ to 7/8 · affects the parallel resonance frequency f _p at λ, etc.), the parallel resonance frequency f _p decreases. In this case, the series resonance frequency f _s is not affected. Therefore, if the configuration as shown in FIG. 5 is utilized by utilizing the above characteristics and only the capacitor C is made variable, the reactance characteristic becomes as shown in FIG.
It is possible to change only the parallel resonance frequency f _p .
In other words, the inductance L causes the series resonance frequency to increase.
When f _os is lowered, the variable range of the parallel resonance frequency f _op becomes wider, and the adjustment range by the size of the sensing plate and the adjustment range by the length of the coaxial cable become wider.

On the other hand, since the circuit configuration of FIG. 5 has a divisional relationship of the inductances L ₁ and L ₂ as shown in FIG. 9, even if the Q of the sensing unit 5 is lowered, the value of the inductance L ₂ can be set to _{When 1} <L ₂ , it is possible to suppress a decrease in Q of the entire tank circuit. In the circuit configuration of FIG. 5, the inductance L may be variable, and the series and parallel resonant frequencies can be varied in the same direction by the inductance L.
As in the case of the capacitor C, the variable range can be widened.

By the way, the in-phase current blocking choke coil 4 of FIG. 4 is included in the sensing part as a part of the coaxial cable 10 in FIG.
Only 10 becomes longer, it has no effect on the differential current. Now, considering the human body detection state of the automatic door, the sensing unit 5 is buried under the floor. Then, radio waves are radiated from the sensing unit 5, and the sensing plate 2 below is operated so as to be grounded to the ground, and radio waves are radiated onto the floor surface from the upper sensing plate 1 like X. It If the Y part is perfect like this, an ideal switch that does not malfunction can be obtained, but since the X plane is also buried in the ground, the grounding state of the Y plane is not perfect (due to construction work). It is almost impossible to completely ground), and the radio waves emitted from the Y surface are transmitted to the moving axis cable 10,
Radio waves are radiated from the metal part (coaxial cable, sash, power line, etc.) including the oscillating part 20, and the radio wave condition is not stable and malfunction occurs. Due to such a phenomenon, it was difficult to put this type of automatic door switch into practical use.

When the grounding condition of the sensing plate 2 is bad, radio waves are radiated like a kind of dipole antenna as shown in FIG.
When the length of the antenna on the side is changed by the metal 6 such as a power line, the radiation state of the radio wave is changed, which affects the oscillating section 20 and causes a malfunction. In order to prevent this, the common-mode current blocking choke coil 4 is used. Conditions of the choke coil 4, 1) with respect to the operating frequency f _o of the sensing unit to be used, self-parallel resonant frequency of the choke coil 4
f _o should be about 3 times or more. 2) The inductance of the choke coil 4 must be lower than the frequency f _o by making it resonate with the frequency of several tens _p F (frequency f _b ). 3) The choke coil 4
The wire used for is close to the characteristic impedance of the feeder to be supplied, and it is necessary to wind it around a magnetic material such as ferrite in order to satisfy the above conditions 1) and 2).

Further, as is clear from the characteristics of FIG. 8, the change in the parallel resonance frequency f _op is determined by the length 1 of the coaxial cable and the capacitance C of the sensing plates 1 and 2. The length of the coaxial cable 10 needs the most freedom among the above three elements. That is, the length of the coaxial cable 10 required at the installation site of the automatic door is not known at the time of factory shipment, but it is shipped from the manufacturing factory at the maximum necessary length, adjusted at the installation site and cut to the required length. I am trying to do it. The parallel resonance frequency f _op is adjusted by the method described above. And
Coaxial cable 10 is the maximum length is limited to the relationship of the series resonance frequency f _os and the parallel resonance frequency f _op, as a method of increasing this length, reduce the frequency of f _o, the capacitance C of the sensing plate There is a way to make it smaller. In the former method, since it is necessary to insert the in-phase type current blocking choke coil 4 as described above, it is necessary to make the inductance larger than the above conditions 1) to 3) of the choke coil. Choke coil 4
The inductance can be increased by increasing the magnetic induction rate μ _o of the wound core or by increasing the number of turns of the choke coil 4, but since the magnetic induction rate μ _o is limited, increase the number of turns. There is nothing. Increasing the number of turns increases the length of the twisted pair wire, and therefore has the same correlation as increasing the length of the coaxial cable 10 and is meaningless. Therefore, the capacitance C of the sensing plate is reduced to solve this problem. The impedance converter 3 is a method of reducing the capacitance C. Generally the area of the sensing plate is 0.3 m ² to 2 m ² becomes practical, since it is considered that there is a capacity difference of about 7-fold, Using the ratio of the impedance converter 3 skillfully, the same oscillation frequency f _o Can be covered with.

Furthermore, in order to prevent the radio wave radiated by the sensing unit 5 from flowing into the coaxial cable 10 again as an in-phase current and unnecessarily emitting the radio wave, a long magnetic pole such as a ferrite rod or a dust core is used. A coil may be formed by winding a coaxial cable or the like around the shaft rod 11. Also, a coil may be formed by winding a feeder or the like around a toroidal core made of the same material. By winding the coaxial cable 10 as a coil in this way, a current having the same magnitude as the jacket and the core wire and having opposite directions flows through the coaxial cable 10, so that a differential mode current is formed. Although not affected by the coil, the common-mode current is affected by the coil and does not flow to the oscillation side through the coaxial cable 10. Therefore, there is no unnecessary radiation due to the coaxial cable 10, and stable operation can be performed even when the grounding state of the sensing unit is poor. However, there is a problem that the portion of the choke coil 4 becomes large by winding a feeder such as a coaxial cable or a twisted pair wire.

On the other hand, if the operating frequency is changed by adjusting the capacitance of the capacitor as described above, the level of the detection output DS of the detection unit 21 decreases. For this reason, a voltage adjustment circuit is provided between the varicap VC and the output of the detection unit 21 to enable automatic adjustment within a predetermined level range. That is, when the power is turned on or when the reset button is pressed, the flip-flop 60 is reset and the binary counter 72 is reset.
Therefore, the set output ST of the flip-flop 60 becomes “H”, and the clock pulse CP is counted from the AND gate 71. At this time, the reset output is "L", and the automatic reset type DC amplifier 30 does not operate. Counter 72
When the count pulse (or durran count) of the crop pulse CP is started, the output value is sequentially D / A converted by the resistance network and applied to the varicap VC. In this case, the varicap VC moves from the one with a large (or small) capacity to the one with a small (or large) gradually, and the output DS of the detection unit 21 at this time is increased.
Is a value within the specified range, the output of theound comparator 50
CSA becomes "H". This allows the flip-flop 50
Is set, the output ST becomes "L", the AND gate 71 is turned off, the clock pulse CP is not input to the counter 72, and the count value of the counter 72 is fixed. At the same time, the reset output of the flip-flop 60 is "H".
Next, the DC amplifier 30 starts operating.

Here, in the automatic door control device as described above,
Since the stability of the sensing operation is achieved by the length of the coaxial cable 10, there is a disadvantage that the length becomes several tens of meters in some cases.

(Object of the Invention) According to the present invention, a control circuit including a high-frequency oscillator is connected by a feeder apart from an embedded sensor of an automatic door,
The sensing section acts with a capacitor to form a tuning circuit,
The present invention relates to an automatic door control device configured to open and close the automatic door by detecting a circuit frequency or voltage fluctuation caused by a change in the capacitance of the capacitor when a human body approaches the sensing unit. The above object of the present invention is to provide a high-frequency common-mode current blocking coil in which two single wires are wound around a long-axis-shaped high magnetic permeability material between the feeder and the control circuit or the sensing plate, respectively. It is achieved by interposing.

(Summary of the Invention) The present invention relates to a control device for an automatic door in which a control circuit including a high-frequency oscillator is separated from a sensing plate and connected by a feeder, and is provided between the feeder and the control circuit or the sensing plate. Is connected by two single wires, and each of the above single wires is superposed and wound on a long-axis-shaped high-permeability magnetic material.

(Embodiment of the Invention) By the way, as described above, the high frequency current supplied to the sensing plate of the automatic door is generated by the differential mode current which is the original purpose of the feeder such as the coaxial cable and the twisted pair wire. However, if the grounding state of the sensing unit is poor, the radio waves radiated by the sensing unit will flow into the feeder again as an in-phase current, and unnecessary radio waves will be emitted.

In order to prevent this, in the present invention, the oscillation frequency of the oscillating portion is first set to about 1 to 10 MHz, and as shown in FIG. 1 (A), a long rod made of a high magnetic permeability material such as a ferrite rod or a dust core. A single wire 41 is wound around 40 to form a coil 41A. Next, as shown in FIG. 1 (B), the coil 41A
After winding insulating material 42 such as paper and synthetic resin on the
Furthermore, the single wire 43 is wound in association with the coil 41A to form the coil 43A.
To form. In this way, connect the two single wires 41 and 43 to the long rod.
By overlapping and winding as a coil on the 40, a current having the same magnitude and opposite directions flows through the two single wires 41 and 43, so that the differential mode current is not affected by the formed coil. Although not received, the common mode current is affected by the coil and does not flow to the oscillation side through the single wires 41 and 43. Therefore, there is no unnecessary radiation from the supply line, and stable operation is performed even if the contact state of the sensing plate is poor. Moreover, it is small in size and easy to manufacture.

In the above description, an example in which two single wires are vertically stacked and wound is described, but they may be stacked and wound as shown in FIG.
The shape of the long rod is also arbitrary and may be a flat plate. Further, the control device for the automatic door is not limited to the device shown in FIG. 4, but can be applied to the control device of the type in which the oscillator is supplied from a position distant from the sensing portion. Further, a choke coil as disclosed in Japanese Patent Application No. 56-1640 may be inserted between the oscillator and the control circuit and the power supply.

(Effects of the Invention) As described above, according to the automatic door control device of the present invention, even if the oscillator and the sensing unit are separated, the in-phase current from the sensing unit does not flow through the supply connection line. No malfunction occurs even if the grounding condition of the sensing plate is poor. Moreover, there is an advantage that it is small and easy to manufacture.

[Brief description of drawings]

1 (A), (B), and FIG. 2 are views showing an embodiment of the present invention, FIG. 3 is a view showing a state of a sensing portion of an automatic door, and FIG. 4 is a view of an automatic door control device. A wiring diagram showing one embodiment, FIGS. 5 and 9 are diagrams showing an equivalent circuit of the sensing system, FIG. 6 is a diagram showing an example of a reactance curve of the sensing system, FIGS. 7 (A) and (B). ) Is a diagram for explaining the resonance relationship between the sensing unit and the oscillating unit, FIG. 8 is a diagram for explaining series resonance and parallel resonance, and FIGS. 10 and 11 show the operation of the automatic door sensing unit. It is a figure for explaining. 1,2,51,52 …… Sensing plate, 3 …… Impedance converter,
4 ... Choke coil, 5 ... Sensor, 10 ... Feeder, 20 ... Oscillator, 40 ... Long axis rod, 41,43 ... Single wire.

Claims (1)

(57) [Claims] 1. A control circuit including a high-frequency oscillator is connected by a feeder apart from a sensor for embedding in an automatic door, the sensor acts as a capacitor to form a tuning circuit, and the human body is connected to the sensor. In the control device of the automatic door, which is adapted to open and close the automatic door by detecting the frequency or voltage fluctuation of the circuit caused by the change of the capacitance of the capacitor when the approaching, the feeder and the control circuit or the Control of an automatic door characterized in that two single wires are stacked between a sensing plate and a long-axis high-permeability magnetic material and wound around the high-frequency common-mode current blocking coil. apparatus.