JPS6130398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-wire input lighting device that sequentially switches a plurality of loads each time a power switch is turned on. To provide a lighting device that does not cause a load to be switched when it is restored.

Conventionally, as shown in FIG. 1, a commercial power source 3 and a load control circuit 2 are connected by two wires via a power switch 1.
When the power switch 1 is turned on, the stepping relay 5 of the load control circuit 2 is energized, and its output contacts 5a, 5b, . . .
In a lighting device in which ... are switched and moved sequentially, when a power outage occurs, the state is the same as the cut-off state of power switch 1, so when the power outage returns, load 6a... is switched and switched to the next load lighting state. For example, in the case of a lighting device in which the load 6a... switches from all lights on, to one light on, to light bulbs, and then back to all lights and cycles through this cycle, the load 6a... may switch from all lights on to one light bulb lighting, and then return to all lights and cycle through this cycle. If a power outage occurs while the lights are on, when the power outage returns, the lights shift to the next load lighting state, which is the full lighting state, which is inconvenient and impairs sleeping. Also, even if you are not sleeping as described above, when the power is restored after a power outage, the power switch must be turned off and on several times to move to the next load lighting state and return to the power outage state. There was a problem that it had to be done.

The present invention has been provided in view of the above-mentioned points, and the present invention will be described in detail below with reference to embodiment figures. Second
The figure shows the basic configuration of an embodiment of the present invention, in which power is supplied from a commercial power source 3 to a load control circuit 2 and loads 6a, 6b, etc. through two-wire wiring via a power switch 1, and the power switch 1 is turned off. →Every time you turn on the power switch 1, the load control circuit 2
The output contact 5a is detected by the switch discrimination operation circuit inside the switch and energizes the stepping relay.
The loads 6a... are sequentially switched by.... In addition, in the circuit shown in FIG. 2, a resistor that does not operate the load 6a is connected as a voltage drop element 7 in parallel to the power switch 1, so that the voltage applied to the load control circuit 2 is in a high voltage state when on, and in a high voltage state when off. The power switch 1 can be operated in three states: a low voltage state during a power outage, and a zero voltage state during a power outage, so that the operation of the power switch 1 can be easily determined.

FIG. 3 shows an embodiment of the load control circuit 2 of the present invention, which includes a Zener diode D _Z , a diode
D ₂ , resistor R ₂ to R ₆ , capacitor C ₂ and programmable union transistor (hereinafter referred to as
(abbreviated as PUT) constitutes a switch operation discrimination circuit 4, and the output of this switch operation discrimination circuit 4 turns on and off a switching transistor Tr to excite a stepping relay 5. In the figure, _T1 is a power transformer, _D1 is a rectifier diode, _C1 is a smoothing capacitor, and _D3 is a surge absorption diode. However, in the circuit of Fig. 3, when the commercial power supply 3 is turned on after being turned off for a long period of time, the capacitor
During the off-period of the commercial power supply 3, the energization of _C1 and _C2 is cut off by the Zener diode _DZ , and no charge is accumulated, so the voltage across the resistor R6 and the voltage V _R6 are _the resistors.
The voltage across _R3 momentarily becomes higher than V _R3 and PUT becomes conductive. Therefore, a voltage drop across the resistor _R4 occurs, causing the transistor Tr to become non-conductive, and the stepping relay 5 to be not energized. On the other hand, if the contacts 5a, . Contacts 5a, 5b,...
Also, the contact 5a is closed and the first load 6a maintains the lighting state. Next, when power switch 1 is turned off, capacitor C ₂ starts discharging, but if the resistance value of resistor R ₃ is made high, the time constants C ₂ and R ₃ will be long, and the
The voltage V _R3 across R ₃ drops with this time constant (because it is cut by the Zener diode D _Z ,
No current is applied to capacitor _C2 from the power supply side). If the time to turn on the power again is immediately after turning off the power switch 1, voltage V _R3 will be higher than voltage V _R6 , so PUT will not conduct, and therefore stepping relay 5 will be energized and output. The next contact 5b of the contacts 5a, 5b, .

As described above, if the switches are turned on and off within a short period of time, the loads 6a, 6b, . . . will be sequentially shifted. On the other hand, if it takes a long time to turn on the commercial power supply 3, such as during a power outage, the charge in the capacitor _C2 will be discharged and there will be no charge in the capacitor _C2 , so when the commercial power supply 3 is applied However, the states of the loads 6a, 6b, . . . do not change. This is because the stepping relay 5 is not excited because PUT is turned on and the transistor Tr is turned off. As mentioned above, the embodiment circuit of FIG.
By detecting the terminal voltage of capacitor C ₂ which is discharged with the time constant of C ₂ and R ₃ when it is off, a power-off time judgment circuit is formed, and if the power-off time is short, PUT is turned off. , turns on the transistor Tr to excite the stepping relay 5, and when the power is cut off for a long time, turns on the PUT to turn off the transistor Tr and de-energizes the stepping relay 5, so that the load 6a, 6b,...
This is to cut off the switching operation.

FIG. 4 shows another embodiment of the load control circuit 2 of the present invention, in which a Schmitt trigger circuit consisting of transistors Q ₁ and Q ₂ controls the capacitor.
The switch operation determination circuit 4 is configured to detect the voltage generated across the resistor _R3 by the charging current to _C2 , and the stepping relay 5 is energized by the collector of the transistor _Q2 . In the diagram
_C3 is a speed up capacitor, and _R2 to _R8 are resistors. However, in the circuit shown in Fig. 4, after the power switch 1 is turned off for a long time or the power is cut off due to a power outage, when the power switch 1 is turned on or the power outage is restored, the normal commercial power 3 voltage is applied to terminals A and B. is applied, the Zener diode D _Z cuts off current to the capacitor C ₂ when the power is turned off, and since no charge is accumulated in the capacitor C ₂ , a voltage is applied across the resistor R ₃ . A high pulse voltage is momentarily applied, transistor Q ₁ becomes conductive, transistor Q ₂ becomes non-conductive, and stepping relay 5 is not energized, so that loads 6a, 6b, . . . are not switched. Here, when the power switch 1 is in the OFF state, the positions of the contacts 5a, 5b, .
is not excited, and the first load 6a continues to be lit with the contact 5a remaining closed. By the way, the Schmitt trigger circuit constituting the switch operation discrimination circuit 4 in the circuit shown in FIG. 4 is designed to have a hysteresis characteristic as shown in FIG. ₃ is set to V _{1 (ON)} , and the resistance R ₃ when the power switch 1 is off
When the voltage across the terminal is V _1(OFF) , these voltages
V _{1 (ON)} and V _{1 (OFF)} are set to be at each position shown in Figure 5, and in this Figure 5 circuit, V _ON is the resistance R ₃ when the transistor Q ₂ is turned on. , V _OFF is the voltage across resistor R ₃ when transistor Q ₂ is turned off.
However, when the power is turned on after the above-mentioned state, that is, the power is turned off for a long time, the voltage V _R3 across the resistor R ₃ momentarily exceeds the voltage V _OFF , so the transistor Q ₂ is turned off, and then the resistor R ₃ The voltage at both ends V _R3 settles to the state of V _{1 (ON)} . Next, when power switch 1 is turned on immediately after being turned off, capacitor _C2 has not yet been sufficiently discharged, so the voltage V _R3 across resistor _R3 does not exceed V _OFF , and on the other hand, Due to the characteristics of the Schmitt trigger circuit, the power switch 1
Once the voltage V _R3 across the resistor R ₃ drops below V _ON due to turning off, the transistor Q ₂ turns on.
Even after the power switch 1 is turned on, the transistor _Q2 remains on. Therefore, the stepping relay 5 is energized for this purpose.
Open contact 5a, close contact 5b, and apply the next load 6b.
When this is repeated, the loads 5a, 5b, . . . are sequentially shifted. On the other hand, when the power is cut off for a long time, such as during a power outage, the charge in capacitor C ₂ is sufficiently discharged, so as mentioned at the beginning of the operating state, transistor Q ₂ is turned off and the stepping relay is turned off. 5 is not excited and loads 6a, 6b,
... will not shift to the next state, and when the power is restored after a power outage, the state before the power outage will be maintained.

FIG. 6 shows another embodiment of the present invention, in which a switch operation discrimination circuit 4 of the power-off time discrimination type is constructed using a lambda diode D which has a characteristic of becoming non-conductive when a certain voltage is exceeded. It utilizes the fact that when a resistor is connected in series with the lambda diode D, it has a characteristic of having hysteresis as shown in FIG. . That is, in FIG. 7, the vertical axis is the collector current I _Q1 of the transistor _Q1 , the horizontal axis is the voltage V _R3 across the resistor _R3 , and
V _{1 (ON)} and V _{1 (OFF)} are the voltages across resistor R ₃ in the steady state when power switch 1 is turned on or off, respectively, and V _ON and V _OFF are the voltages across resistor R 3 when transistor Q ₁ is turned on or off, respectively. If the voltage across resistor R _{is 3} , then
A hysteresis operation as shown in the figure will be performed, and the same operation as in the embodiment of FIG. 4 will be performed.

FIG. 8 shows a circuit diagram of a load control circuit 2 according to yet another embodiment of the present invention, in which the low voltage level dropped by the voltage drop element 7 when the power switch 1 is turned off is shown. This shows an example in which the switch operation determination circuit 4 is configured using a holding circuit 8 that stores the state. Therefore, in this embodiment circuit, the holding circuit 8 is composed of a circuit centered on PUT, and the cathode voltage of this PUT is divided by resistors R ₄ and R ₅ to generate a transistor.
The switch operation discrimination circuit is configured so that the voltage is applied to the base of _Q1 , and the resistor
R ₂ and R ₃ are resistors for dividing the power supply voltage, R ₆ is a resistor for limiting the Zener current of the Zener diode D ₂ , D ₃ is a Zener diode, and D ₄ is a surge suppression diode. However, in the holding circuit 8 of this embodiment, the Zener voltage of the Zener diode D ₂ and the voltage dividing ratio by the resistors R ₂ and R ₃ are set so that PUT is turned off when the power switch 1 is turned on. . That is, when the power switch 1 is turned on, the voltage V _R3 across the resistor R ₃ is made larger than the Zener voltage of the Zener diode D ₂ , and by making the gate voltage of the PUT higher than the anode voltage, the PUT is reverse biased. , is maintained in the OFF state, whereby the transistor _Q1 is turned OFF, the stepping relay 5 is not excited, and the loads 6a, 6b, . . . are not switched. Next, when the power switch 1 is turned off, the voltage drop element 7 connected in parallel to the power switch 1 is set so that the voltage V _R3 across the resistor R ₃ at that time is equal to or less than the Zener voltage of the Zener diode D ₂ .
By designing the resistance value of PUT, the anode voltage of PUT is higher than the cathode voltage, and this PUT
turns on. However, in this case, the Zener diode
Since voltage application to the circuit of transistor Q ₁ is cut off by D ₃ , this transistor Q ₁ is not turned on, stepping relay 5 is not energized, and its output contacts 5a, 5b, etc. are not switched. .
After this, when power switch 1 is turned on,
Since PUT becomes retentive and maintains the on state, and remembers the low voltage level state caused by turning off power switch 1, the output of this PUT turns on transistor _Q1 , and therefore, stepping relay 5 is energized. Then, the output contacts 5a, 5b, . . . are switched.

As described above, the present invention is comprised of an on/off type switch, and connects a load control circuit to a power source via a power switch in which a voltage drop element that does not operate the load is connected in parallel, and connects a load control circuit to a power source through the voltage drop element. a switch operation determination circuit is provided in the load control circuit to determine whether the power switch is operated or a power outage occurs depending on whether or not a low voltage level is applied to the load control circuit;
When this switch operation discrimination circuit determines that the power switch has been turned on after being turned off, the stepping relay is energized, and the output contacts of this stepping relay are sequentially switched and closed to sequentially switch and drive multiple loads. Because it was designed to
Multiple loads can be switched on and off in sequence simply by turning on and off a power switch installed as a wall switch, etc. Moreover, the input line is a two-wire wiring, which simplifies wiring. In addition, it is equipped with a switch operation discrimination circuit that determines whether a power switch was operated or a power outage occurred, so even if a power outage occurs, the load status after the power outage is restored is the same as the load before the power outage. This has the effect of preventing any inconvenience caused by inadvertent load switching.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is an overall circuit diagram of an embodiment of the present invention, Fig. 3 is a circuit diagram of the same load control circuit, and Fig. 4 is a load control circuit of another embodiment of the present invention. A circuit diagram of the control circuit, FIG. 5 is an explanatory diagram of the operation of the circuit of FIG. 4, FIG. 6 is a circuit diagram of a load control circuit according to another embodiment of the present invention, and FIG. 7 is an operation of the embodiment of FIG. The explanatory diagram, FIG. 8, is a circuit diagram of a load control circuit according to yet another embodiment of the present invention, in which 1 is a power switch, 2 is a load control circuit, 3 is a power supply, 4 is a switch operation determination circuit, and 5 is a circuit diagram of a load control circuit according to still another embodiment of the present invention. 5a with stepping relay,
5b,... are the contacts, 6a, 6b,... are the loads, 7
is a voltage drop element, and 8 is a holding circuit.

Claims (1)

[Claims] 1. A load control circuit is connected to a power source via a power switch which is an on/off type switch and has a voltage drop element connected in parallel to the extent that the load does not operate, A switch operation discrimination circuit is provided in the load control circuit to discriminate whether the power switch is operated or a power outage occurs depending on whether or not a low voltage level is applied, and the switch operation discrimination circuit temporarily turns off the power switch. A lighting device characterized in that a stepping relay is energized when it is determined that the stepping relay has been turned on, and the output contacts of the stepping relay are sequentially switched and closed to sequentially switch and drive a plurality of loads. . 2. Claim 1, characterized in that the switch operation determination circuit is constituted by a power-off time determination circuit, and it is determined that the power switch has been operated when the power-off time is short. lighting equipment. 3 A holding circuit is provided in the switch operation discrimination circuit to memorize the low level state dropped by the voltage drop element when the power switch is turned off, and after this holding circuit maintains the low voltage level state, the high voltage level when the power switch is turned on is 2. The illumination device according to claim 1, wherein operation of a power switch is discriminated and detected when a level is applied to a switch operation discrimination circuit.