JPS6282189A - Automatic door controller - 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] (Technical field of invention) The present invention relates to an automatic door control device.

(Technical background of the invention and its problems) Conventionally, as shown in FIG. 13, a sensing section (sensing plate 101.
In an automatic door control device that is driven by an oscillator in a control section 103 that is installed separately from the control section 102), the control section 103 is pulled across the door 105 by a feeder 104 such as a coaxial cable. Although the feeder 104 is wired, the length of the feeder 104 becomes a problem due to the structure of the building. In other words,
Since the length of the feeder 104 is kept constant during manufacture and the circuit system is adjusted, it is not possible to change the length by cutting the feeder 4 at the actual installation site. If the feeder is cut at the installation location, the cable length will change and the adjustment parameters will change, making it impossible to perform reliable door opening/closing operations.
It was necessary to make adjustments to the circuit system on site each time. Here, there are problems in that such adjustment work is difficult without some electrical knowledge, and the work is extremely complicated due to the environment of the installation site. Even if the sensing plate were buried underground, it would be affected by mortar, etc., and would have to be adjusted in the same way as described above.

That is, for this type of door control device.

A pair of sensing plates 101 and 102 are considered as capacitors to form a bridge circuit, and electrical balance is maintained by adjusting the capacitance of the variable capacitor that forms one side of the bridge circuit. Utilizing the change in capacitance between the plates 101 and 102, a signal is generated when the balance is lost and a switching operation is performed to open and close the door 105. However, when the length of the feeder is changed or the environment changes, the capacity of the built-in variable capacitor must be readjusted, and the adjustment work is extremely complicated. In addition, the sensing plates 101 and 102 and the feeder +
04 is used as part of a resonator and tuned with a capacitor, and when a person approaches the sensing part, the Q and frequency of the oscillator's tuned circuit change, which is detected and the door is opened/closed. However, even with this control device, if the length of the feeder changes or the environment changes, the capacitance of the capacitor built into a part of the resonator must be readjusted. There is.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to provide an automatic door control device that can arbitrarily adjust the length of a feeder and automatically stabilize its operation.

(Summary of the Invention) The present invention relates to an automatic door control device in which a control circuit including an oscillator and a detector is connected separately from a sensing section, and a feeder connected between the sensing section and the oscillating section. And, the in-phase y! made by winding this feeder in a high permeability magnetic material. ! ! A current blocking choke coil, a varicap connected between the input and common potential of the transmitter, and a varicap connected between the varicap and the output of the detector so that the output level of the detector falls within a predetermined range. A connected potential adjustment circuit is provided.

(Embodiment of the Invention) FIG. 1 shows an example of an automatic door control device according to the present invention in which a sensing portion and a control circuit are separated, and two embedded sensing plates 1. 2 and the oscillating section 20, an impedance converter 3, which will be described later, an in-phase current blocking choke coil 4, which will be described later, and a feeder IQ such as a coaxial cable are connected in series. The output is detected by a detection section 21, and an automatic reset type DC amplifier 30 as shown in Japanese Patent Publication No. 80-34283, for example, is connected to this detection section 21. A door opening/closing signal DRC is output by detecting changes in the capacitance and Q of No. 2, that is, the proximity or separation of a human body. Further, the input of the oscillation section 20 is connected to a common potential via the capacitor C1 and the varicap VC, and the output DS of the detection section 21 is input to the window comparator 50 forming a voltage 'gJ rectifying circuit.

Comparator 50 is a comparator 51 that sets the minimum value.
, a comparator 52 that sets the maximum value, and a NOR gate 53 that takes the AND of the outputs of the comparators 51 and 52.
The thresholds of the comparators 51 and 52 are set to positive and negative values within a predetermined range. The output GSA of the window comparator 5G is input to the set terminal of the flip-flop 80, and 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. Pulse CP is input to the clock terminal of binary counter 72. counter 7
The output (Q+"Qn) of 2 is OA-converted by a ladder circuit of a resistor 2R and a resistor H, and this DA-converted value is applied to the varicap VC via a resistor R30. Further, a reset signal R3 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. The reset output RO of 60 is provided to the amplifier 30 so that the amplifier 30 is not activated when the flip-flop 80 is reset, that is, when the counter 72 is activated.

Here, the choke coil 4 is a line with the same characteristic impedance as the tweeter 10, the two sensing plates 1.2 are equivalent to capacitors, and a resonance coil and a resonance capacitor are installed at the tip of the feeder IO. Since they are connected in series, the sensing system shown in FIG. 1 becomes as shown in FIG. 2. When examining the relationship of the impedance za to the line scraping at the inlet of the feeder (hereinafter referred to as coaxial cable) 10 in FIG. 2, it becomes as shown by the solid line in FIG. 3. Incidentally, the broken line characteristic in FIG. 3 shows the case where the tip is open and the sensing plate capacitor Cc is not connected. The capacitive load shown by the solid line is the curve when the characteristic impedance ZQ=XC, and is λ/
The phase is delayed by 8 due to reflection. Therefore, depending on the capacitance of the capacitors (sensing plates 1 and 2), the characteristics vary between a short circuit and an open circuit.

For convenience of explanation, capacitor capacity Cc is exactly 2G=XC
If it is the value of
It's in the entrance. When used as a human body sensor for an automatic door, parallel resonance is preferable, so once the length of the coaxial cable IO is determined, the frequency fo of the parallel resonance of this circuit system can be determined. At this frequency, as shown in FIG. 4(A) or (B), the oscillation frequency to of the oscillating section 20 is brought close to the frequency fil of the sensing BB5, and the capacitor couple in FIG. The inductive couple causes the oscillation section 20 to be affected by the approach of a human body to the sensing section 5, that is, a shift in the frequency afo+ or a decrease in Q.
Then, a change occurs in the oscillation output, and this change is detected by the automatic reset type DC amplifier 30.

By the way, the size of the sensing plate for automatic doors varies depending on the size of the door entrance, and since the sensing plate is buried under the floor, it cannot be used as a pure capacitor, and the length of the coaxial cable lO is The problem is that it varies depending on the burial location.

For this reason, the second rI! Resonant coil L as shown by J
and a resonance capacitor C. That is, by inserting the resonant coil L in series, the capacitive part of the reactance characteristic (O~in/8, 3/8・λ~57
8・λ, etc.), and the series resonant frequency f as shown in Figure 5 (A).
The series resonant frequency fs decreases by affecting S. Fifth
As shown in Figure (B), by inserting a capacitor C in parallel that does not affect the parallel resonance frequency fP, the inductive part of the reactance characteristic (input/8 to 378, input, 5
/8·λ to 7/8·λ, etc.) affects the parallel resonance frequency fp, and the parallel resonance frequency 15up decreases. in this case.

does not affect the series resonant frequency fS, therefore
If the configuration shown in Fig. 2 is created by utilizing the above-mentioned characteristics and only the capacitor C is made variable, its reactance characteristics will become as shown in Fig. 6, and the parallel resonance frequency fi
It becomes possible to change only fp. In other words,
When the series resonant frequency ros is lowered by the inductance L, the variable range of the parallel resonant frequency for becomes wider, and the range of adjustment based on the size of the sensing plate and the length of the coaxial cable becomes wider.

On the other hand, since the circuit configuration of FIG. 2 has a relationship between the inductances L and L2 as shown in FIG.
By selecting the value of the inductance L2, even if there is a decrease in the inductance L2, it is possible to suppress the decrease in the Q of the entire tank circuit so that Ll<L2.

In addition, in the circuit configuration shown in Figure 2, the inductance L may be made variable, and since the series and parallel resonance frequencies can both be varied in the same direction by the inductance L, the variable range can be widened as in the case of the capacitor C. can.

By the way, the in-phase current blocking choke coil 4 shown in FIG.
is included in the sensing part as part of the coaxial cable 10 in Figure 2, so in the tank circuit that occurs here, the coaxial cable lO is only longer and has no effect on the differential current. Considering the state of human body detection at the door,
The sensing part 5 is buried under the floor. Then, radio waves are emitted from the sensing part 5, and the lower sensing plate 2 operates as if it were grounded to the earth, and the upper sensing plate l emits radio waves onto the floor as shown by X. Ru. If the Y part is perfect in this way, you can obtain an ideal switch that will not malfunction, but since the X side is also buried underground, the grounding condition of the Y side must be perfect (for construction reasons). Complete grounding is almost impossible), the radio waves emitted from the Y plane are transmitted to the coaxial cable 10, and the metal parts including the oscillating part 20 (coaxial cable, wire,
Radio waves are emitted from power lines (light lines, etc.), and the radio wave conditions become unstable, causing malfunctions. Because of this phenomenon, it has been difficult to put this type of automatic door switch into practical use.

When the VC ground condition of the sensing plate 2 is poor, radio waves are radiated like a kind of dipole antenna as shown in Fig. 9, and Y
If the length of the side antenna changes due to metal 6 such as a power line, the radiation state of radio waves changes, which affects the oscillation unit 20 and causes malfunctions. In order to prevent this, a common-mode current blocking choke coil 4 is used.

The conditions for this choke coil 4 are: 1) The self-parallel resonance frequency ro of the choke coil 4 is approximately three times or more as compared to the operating frequency fo of the sensing section to be used, and 2) The inductance of the choke coil 4 is several hF. It must resonate (frequency fb) with one frequency lower than to,
3) The wire used for the choke coil 4 has a characteristic impedance close to that of the feeder to which it is supplied, and must be wound in a magnetic material such as ferrite in order to satisfy the conditions 1) and 2) above.

Furthermore, as is clear from the characteristics shown in FIG. 6, the parallel resonance frequency fOP changes depending on the length of the coaxial cable and the length of the sensing plate 1.
It is determined by the capacitance C of 2. Of the three elements mentioned above, the one that requires the greatest degree of freedom is the length of the coaxial cable 10. In other words, the length of the coaxial cable lO required at the installation site of an automatic door is not known at the time of shipment from the factory, and the maximum required length is shipped from the manufacturing factory, adjusted at the installation site, and cut to the required length. I try to do that. Note that the parallel resonance frequency fOP is adjusted by the method described above.

The maximum length of the coaxial cable 10 is limited by the relationship between the series resonant frequency fos and the parallel resonant frequency rop, but ways to increase this length include lowering the frequency of fo or decreasing the capacitance C of the sensing plate. There is a way to do it. In the former method, as described above, since it is necessary to include the in-phase current blocking choke coil 4, it is necessary to make the inductance larger than the above-mentioned choke coil condition 3).

The method of increasing the inductance of the choke coil 4 is to increase the magnetic permittivity 0 of the core around which it is wound, or to increase the e! of the choke coil 4. Although it is better to increase the number, the magnetic permittivity p
Since there is a limit to o, the only option is to increase the number of turns.

Increasing the number of turns means lengthening the pair twist a, so the correlation is the same as increasing the length of the coaxial cable 10, which is meaningless. Therefore, this problem is solved by reducing the capacitance C of the sensing plate. do. The impedance converter 3 is a method for reducing this capacitance C. Generally, the area of the sensing plate is 0.3 s2 to 2 s2, which is about 7
It is thought that there is a capacitance difference of about twice as much, so if you use the ratio of impedance converter 3 wisely, you can achieve the same oscillation frequency fo.
It can be covered with.

Furthermore, in order to prevent the radio waves emitted by the sensing part 5 from flowing again as an in-mode current to the coaxial cable IO and emitting radio waves unnecessarily, it is necessary to use highly transparent materials such as ferrite yu and dust cores as shown in Fig. 11. A coil may be formed by winding the coaxial cable 11 around a long-sleeved rod 11 made of a magnetic material. Alternatively, as shown in FIG. 12, a coil may be formed by winding the coaxial cable IO around a toroidal core 13 made of the same material. By winding the coaxial cable 10 as a coil in this way, the outer jacket and core wire of the coaxial cable 10 are separated by 'i! Since the currents are equal in size and opposite in direction, the differential mode current is not affected by the formed coil, but the common mode current is affected by the coil and flows through the coaxial cable 10 to the oscillation side. Therefore, there is no unnecessary radiation caused by the coaxial cable 10, and stable operation can be performed even if the grounding condition of the sensing section is poor.

By the way, when the operating frequency is changed by adjusting the capacitor capacity as described above, the level of the detection output O5 of the detection section 21 decreases. For this reason.

In this invention, a voltage adjustment circuit is provided between the pari cap VC and the output of the detection section 21, so that automatic adjustment can be made within a predetermined level range. Namely.

When the power is turned on or the reset button is pressed, the flip-flop 60 is reset and the binary counter 72 is reset.
is reset. Therefore, the set output ST of the flip-flop 60 becomes "I(") and clock pulses CP are counted from the 1-AND gate 71.The reset output Q is rLJ, and the automatic reset type DC amplifier 30 is Does not operate, counter 72 receives clock pulse CP
When counting a (or Dallan counting) starts, the output value is sequentially D/^ converted by a resistor circuit and network and applied to the paricap VC. In this case, the Paricap VC gradually moves from the larger (or smaller) capacitance to the smaller (or larger) one, and the output 111S of the detection section 21 at this time
When becomes a value within two ranges, the output GSA of the window comparator 50 becomes rHJ. As a result, the flip-flow pulse 50 is set and its output ST becomes rLJ, and the AND gate 71 is turned off and the clock pulse CP
is no longer input to the counter 72, and the count value of the counter 72 is fixed. At the same time, the reset output Q of the flip 60 becomes "H" and the DC amplifier 30 starts operating.

Note that the impedance converter 3 and the choke coil 4 may be provided between the sensing plates 1 and 2.

Here, in the above-mentioned automatic door control device, the stability of the sensing operation is achieved by the length of the coaxial cable IO, so there is an inconvenience that the length can reach several tens of cables depending on the case.

As shown in FIG. 1θ, a delay line 40 is connected in series with the coaxial cable 10, so that the lumped constant distribution of the reactance component of the delay line 40 replaces the distributed constant distribution of the coaxial cable IO. That is, the delay line 40 has a configuration equivalent to that of the coaxial cable IO on the circuit element, and its distribution constant is the same as that of the coaxial cable 10.
Since the distribution is concentrated, the coaxial cable 10 is delayed by, for example, 10 m to apparently replace the entire length. That is, the third
In the characteristics shown in the diagram, even if a coaxial cable with a length equivalent to 3/4-in is actually required, by replacing this length with a short delay line, the characteristics can be shifted to 3/4-in. can do. Therefore, in the installation location of an automatic door, the coaxial cable IO may be wired in, for example, 40 layers as a result of adjustment, even though the sensing section 5 and the oscillating section 20 have not conventionally been measured, for example, IOml. However, according to this, the coaxial cable lO is 865
1, and the remaining length can be connected by a delay line 40 to provide a delay. Even with this, the operation is exactly the same and no malfunction occurs, so there is no need to wire long coaxial cables that waste space.
There is no problem in disposing of the surplus.

[Brief explanation of drawings]

Fig. 1 is a wiring diagram showing one embodiment of the automatic door control device according to the present invention, Figs. 2 and 7 are diagrams showing both circuits of the sensing system, and Fig. 3 is an example of the sensing system glue actance curve. Figures 4 (A) and (B) are diagrams for explaining the resonance relationship between the sensing section and the oscillating section, and Figure 5 (A) is a diagram showing the
), (B) and FIG. 6 are diagrams for explaining series resonance and parallel resonance, FIGS. 8 and 9 are diagrams for explaining the operation of the automatic door sensing section, and FIG. Figures 11 and 12 are diagrams showing the principle, respectively.
The figure shows a control system for a general automatic door. 1.2... Sensing plate, 3... Impedance converter,
4... Chiyoke coil for in-phase first current blocking, 5... Sensing section, 10... Coaxial cable, 20... Oscillating section, 30
...Automatic reset type DC amplifier, 40...Delay line. Certain 2 House Z, 2 Fig. 3 (,4) (B) Certain 4 Fig. 6 Fig. 5 γ Hand β Fig. 6゜Vine 9 Fig.

Claims (2)

[Claims] (1) In an automatic door control device in which a control circuit including an oscillating part and a detection part is connected separately from a sensing part, a feeder connected between the sensing part and the oscillating part and a high magnetic permeability an in-phase current blocking choke coil wound around a magnetic material; a varicap connected between the input of the oscillation section and a common potential; and a varicap connected so that the output level of the detection section falls within a predetermined range. and a voltage adjustment circuit connected between the output of the detection section. (2) The voltage adjustment circuit includes a window comparator that detects whether the output level of the detection section is within a predetermined range, a flip-flop that is set by the output of the window comparator and set by a reset signal; The claimed invention comprises a counter that inputs and counts clock pulses when the flip-flop is reset, and a D/A converter that converts the count value of this counter into a D/A converter and applies the D/A converter to the varicap. Automatic door control device according to scope 1.