JPH0724175B2 - Dimmer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimming device, and more particularly, to a dimming device capable of detecting a conduction / interruption state of a breaker.

Conventional technology and problems to be solved by the invention In a breaker provided for overcurrent protection between various loads and their control devices, an alarm switch and an auxiliary switch are conventionally added as so-called option equipment. A configuration that can be used is used. The alarm switch is a switch that electrically indicates the trip state of the breaker, and the auxiliary switch is a switch that electrically indicates the conduction / interruption state of the breaker.

However, in general, the breaker used to protect the semiconductor of the dimmer is a small JIS agreement type 1P type installed in one of the two lines that supply power to the load. It is technically difficult to incorporate the auxiliary switch as described above.

On the other hand, the dimmer has a function called the tally function that accurately detects the lighting state of the load, and a function that directly electrically detects the conduction / interruption state of the breaker to determine the actual lighting load state. There is a demand for accurate confirmation.

An object of the present invention is to provide a light control device having a function capable of electrically accurately detecting the operating state of a breaker.

Means for Solving the Problems According to the present invention, one power supply line 2 of an AC power supply 4, a triac Q0, a breaker 6, a lighting load 7, and an AC power supply 4 are provided.
The other power supply line 3 is connected in this order to form a closed loop, and the drive circuit 21 for controlling the conduction angle of the triac Q0 is provided, and the first resistor R0 and the first capacitor are connected in parallel with the triac Q0.
A snubber circuit 22 configured by connecting C0 in series is connected, and between the first voltage detection circuit 11 and the first connection point 8 between the triac Q0 and the breaker 6 and the other power supply line 3. Is connected to the second resistor R1, at the first connection point 8, the first diode D1, the third resistor R2, the first Zener diode ZD1 connected in the reverse direction to the first diode D1, and The first voltage detection circuit 11 and the second voltage detection circuit 12 are configured such that the base of the first transistor Q1 is connected in this order, and one output end of the first transistor Q1 is connected to the other power supply line 3. , Breaker 6 and lighting load 7
Between the second connection point 9 and the other power supply line 3,
A second capacitor C1 is connected, a second diode D2, a fourth resistor R3, a second zener diode ZD2 connected in a reverse direction to the second diode D2, and a second diode D2 at a second connection point 9.
The base of the transistor Q2 is connected in this order, and the second
One output terminal of the transistor Q2 is connected to the other power supply line 3, a second voltage detection circuit 12, an inverter gate IC1 for inverting the output of the other output terminal of the first transistor Q1, and the other of the second transistor Q2. The impedance of the lighting load 7 includes the AND gate IC2 to which the output of the output end and the output of the inverter gate IC1 are given, and the display element D3 which is turned on or off depending on the level of the output of the AND gate IC2. It is selected to be sufficiently lower than the impedance of 22 and the resistance value of the second resistor R1 is selected so that the input impedance of the first voltage detection circuit 11 is larger than the impedance of the snubber circuit 22 and is lower than the resistance value of the third resistor R2. Select sufficiently small, reactance of the second capacitor C1 (1 / εC1)
Is selected so that the input impedance of the second voltage detection circuit 12 is smaller than the impedance of the snubber circuit 22,
Further, the dimmer is characterized by being selected sufficiently smaller than the resistance value of the fourth resistor R3.

Further, according to the present invention, one power supply line 2 of the AC power supply 4, the triac Q0, the breaker 6, the lighting load 7, and the other power supply line 3 of the AC power supply 4 are connected in this order to form a closed loop. The drive circuit 21 for controlling the conduction angle of the triac Q0 is provided, and the first resistor R0 and the first capacitor are provided in parallel with the triac Q0.
A snubber circuit 22 configured by connecting C0 in series is connected, and is a first voltage detection circuit 11 between the first connection point 8 between the triac Q0 and the breaker 6 and the other power supply line 3. Is connected to the second resistor R1, and the first connection point 8 is connected to the first diode D1, the third resistor R2, the first diode Q3, and the first resistor D1.
The base of the transistor Q1 is connected in this order, and
One output terminal of the transistor Q1 is connected to the other power supply line 3 to form a first voltage detection circuit 11 and a second voltage detection circuit 12, which are a breaker 6 and a lighting load 7.
Between the second connection point 9 and the other power supply line 3,
The second capacitor C1 is connected, the second diode D2, the fourth resistor R3, the second diode Q4, and the base of the second transistor Q2 are connected in this order to the second connection point 9, and the second transistor C2 is connected. One output terminal of Q2 is connected to the other power supply line 3, a second voltage detection circuit 12, an inverter gate IC1 that inverts the output of the other output terminal of the first transistor Q1, and the other output of the second transistor Q2. The impedance of the lighting load 7 includes the AND gate IC2 to which the end output and the output of the inverter gate IC1 are given, and the display element D3 which is turned on or off according to the output level of the AND gate IC2. Sufficiently lower than the impedance of the second resistor R1 and the resistance value of the second resistor R1 so that the input impedance of the first voltage detection circuit 11 is larger than the impedance of the snubber circuit 22. And select sufficiently smaller than the resistance value of the third resistor R2, the reactance of the second capacitor C1 (1 / εC1)
Is selected so that the input impedance of the second voltage detection circuit 12 is smaller than the impedance of the snubber circuit 22,
Further, the dimmer is characterized by being selected sufficiently smaller than the resistance value of the fourth resistor R3.

According to the present invention, for dimming, the AC power supply, the triac Q0, the breaker 6 and the lighting load 7 are connected so as to form a closed loop, and the snubber circuit 22 is connected in parallel to the triac Q0. And the first voltage detection circuit
The output of 11 is passed through inverter gate IC1 and AND gate I
It is applied to one input of C2, and the output of the second voltage detection circuit 12 is applied to the other input of the AND gate IC2.
3 is turned on or off, whereby the operation shown in Table 1 described later is achieved, that is, when the breaker 6 is shut off, even if the dimming operation of the lighting load 7 is not performed, It is possible to display the conduction or interruption state of the breaker 6.

The impedance of the lighting load 7 is selected to be sufficiently lower than the impedance of the snubber circuit 22, and the lighting load 7 may be, for example, an incandescent lamp.

The resistance value of the second resistor R1 included in the first voltage detection circuit 11 is
The input impedance of the first voltage detection circuit 11 is selected to be larger than the impedance of the snubber circuit 22, that is, the resistance value of the second resistor R1 is increased, thereby lowering heat generation and achieving miniaturization. it can.

According to the invention, the reactance (1 / εC1) of the second capacitor C1 included in the second voltage detection circuit 12 is selected so that the input impedance of the second voltage detection circuit 12 is smaller than the impedance of the snubber circuit 22. That is, the reactance of the second capacitor C1 can be reduced, heat generation can be suppressed, and downsizing can be achieved. By increasing the input impedance of the first voltage detection circuit 11 as described above, regardless of whether the breaker 6 is turned on or off,
The reliable operation can be realized, and the input impedance of the second voltage detection circuit 12 can be made small to realize the reliable operation regardless of the presence or absence of the lighting load 7.

Embodiment FIG. 1 is a block diagram showing the basic structure of a light control device 1 according to an embodiment of the present invention. Electric power from the power source 4 led out between the power source lines 2 and 3 is supplied to the lighting load 7 via the dimmer 5 and the breaker 6 which are interposed in series in the power source line 2. A connection point 8 between the dimmer 5 and the breaker 6,
A first voltage detection circuit 11 is provided between the power supply line 3 and the power supply line 3. A second voltage detection circuit 12 is provided between the connection point 9 between the breaker 6 and the lighting load 7 and the power supply line 3.

The outputs from the first and second voltage detection circuits 11 and 12 are given to the judgment circuit 13. The determination circuit 13 determines that the breaker 6 is shut off when the voltage is detected by the first voltage detection circuit 11 and the voltage is not detected by the second voltage detection circuit 12. , Display device
Derives the output to 14.

FIG. 2 is an electric circuit diagram showing a specific configuration of the light control device 1 shown in FIG. The dimmer 5 is the power line 2
Q0 which is interposed in series with the drive circuit 21, which is realized by, for example, a microcomputer and controls conduction / interruption of the triac Q0, and a series circuit of a resistor R0 and a capacitor C0.
And a snubber circuit 22 connected in parallel to

The first voltage detection circuit 11 includes resistors R1 and R2 and a diode D1.
And a Zener diode ZD1 and a transistor Q1. The resistor R1 is connected to the connection point 8 and the power supply line 3
The output power from the resistor R1 is half-wave rectified by the diode D1 and then given to the base of the transistor Q1 via the resistor R2 and the zener diode ZD1. The emitter of the transistor Q1 is connected to the power line 3 and the collector is line 1
It is connected to the judgment circuit 13 via.

Similarly, the second voltage detection circuit 12 includes a capacitor C1 and
Diode D2, resistor R3, Zener diode ZD2,
And a transistor Q2. Capacitor C1
Is connected between the connection point 9 and the power supply line 3, and the output voltage from the capacitor C1 is the diode D2.
After being half-wave rectified by, the voltage is given to the base of the transistor Q2 via the resistor 3 and the zener diode ZD2. The emitter of the transistor Q2 is connected to the power supply line 3, and the collector is connected to the judgment circuit 13 via the line l2.

The judgment circuit 13 includes an inverter gate IC1 and an AND gate I
It is configured to include C2 and resistors R4 and R5. The line 1 from the first voltage detection circuit 11 has an inverter gate IC1
Is connected to one input of the AND gate IC2 via.
A resistor R is also connected to the one input of the inverter gate IC1.
A high level voltage V _D is applied via 4. The line 12 from the second voltage detection circuit 12 is an AND gate IC
Connected to the other input of 2. The high level voltage V _D is also applied to the other input of the AND gate IC2 via the resistor R5.

The output of the judgment circuit 13 derived from the AND gate IC2 is given to the anode of the light emitting diode D3 constituting the display device 14. The cathode of the light emitting diode D3 is grounded.

Therefore, the transistor Q1 of the first voltage detection circuit 11 becomes conductive, the low level input is given to the inverter gate IC1 of the determination circuit 13, and the transistor Q2 of the second voltage detection circuit 12 is cut off. , When the line l2 is at high level, that is, when the breaker 6 is shut off,
The AND gate IC2 derives a high level output, and the light emitting diode D3 lights up. Further, when the transistors Q1 and Q2 are in the same switching state, that is, when the breaker 6 is conducting, the light emitting diode D3 is off. Therefore, these relationships are shown in Table 1.

FIG. 3 is a voltage waveform diagram of the connection points 8 and 9 when the dimmer 5 is not operating and the breaker 6 is cut off. When the dimmer 5 is not operating, the voltage shown in FIG. 3 (1) is derived at the connection point 8 due to the leakage current of the snubber circuit 22.

When the breaker 6 is cut off in this way, the impedance of the dimmer 5 becomes substantially equal to the impedance of the snubber circuit 22, and letting this be Z0, the resistance value of the resistor R0 and the electrostatic capacitance of the capacitor C0 are respectively set. When expressed with the same reference numeral, It is represented by. The impedance Z1 of the first voltage detection circuit 11 is Z1≈R1 (2) by selecting the resistance value of the resistor R1 sufficiently smaller than the resistance value of the resistor R2. Therefore, when the power supply voltage E is expressed by E = V _E Sinωt (3), the voltage at the connection point 8 is It is represented by. Here, if the voltage detection level of the first voltage detection circuit 11 is V _ZD1 , By selecting the resistance value of the resistor R1 so that Then, the transistor Q1 conducts in the section indicated by the reference numeral W1 in FIG. 3, and the line 1 is set to the low level as described above.

On the other hand, when the breaker 6 is cut off, the voltage at the connection point 9 is zero as shown in FIG. 3 (2), so that the transistor Q2 is cut off. As a result, as shown in Table 1, the decision circuit 13 decides that the breaker 6 is shut off and turns on the light emitting diode D3.

FIG. 4 is a voltage waveform diagram of the connection points 8 and 9 when the dimmer 5 is not operating and the breaker 6 is conducting. When the breaker 6 is conducting, the combined impedance Z2 of the first and second voltage detection circuits 11 and 12
Represents the capacitance of the capacitor C1 and the resistance value of the resistor R3 with the same reference numerals, and if 1 / ωC1 << R3 is selected, Therefore, the voltage at the connection points 8 and 9 is As shown in FIGS. 4 (1) and 4 (2), the voltage waveforms are mutually equal.

Therefore, If the resistance value of the resistor R1 and the capacitance of the capacitor C1 are selected so that
Both Q1 and Q2 are cut off.
3 judges that the breaker 6 is conducting, and turns off the light emitting diode D3.

When the lighting load 7 is connected, the impedance of the lighting load 7 is sufficiently lower than the impedance of the snubber circuit 22, so that the voltage at the connection points 8 and 9 becomes substantially zero. Therefore, as in the case described with reference to FIGS. 3 and 4, the judgment circuit 13 can judge the conduction / interruption state of the breaker 6 without malfunctioning.

On the other hand, in the state where the dimmer 5 is operating, assuming that the conduction angle control is performed at the phase angle θ, the operation up to the phase angle θ is cut off by the triac Q0. This is the same as the operation described above. When the phase angle is θ or more, for example, for simplification of the description, considering the case where it is 0 °, the voltage E of the power supply 4 is derived almost as it is at the connection point 8 when the breaker 6 is cut off. On the other hand, the voltage at the connection point 9 remains zero. Therefore, as is clear from the above equation 5, since V _E > V _ZD1 , transistor Q1 is conductive and transistor Q2 is cut off,
Thus, the judgment circuit 13 can judge that the breaker 6 is shut off.

When the dimmer 5 is operating and the breaker 6 is conducting, the power supply voltage E is applied to both the connection points 8 and 9 as it is, and thus the transistor
Both Q1 and Q2 are conducting, and the decision circuit 1 based on the above Table 1
3 can determine that the breaker 6 is conducting.

As described above, in the light control device 1 according to the present invention, the breaker 6
The first voltage detection circuit 11 is provided on the power source 4 side of the breaker 6 and the second voltage detection circuit 12 is provided on the lighting load 7 side of the breaker 6.
Since the breaker 6 is turned on / off based on the outputs from the second voltage detection circuits 11 and 12,
The breaker 6 does not need to be provided with a special structure and can detect the interruption, and thus the breaker 6 can be the JIS agreement type 1P type breaker described above. Further, regardless of whether the dimmer 5 is performing the dimming operation, it can be electrically detected that the breaker 6 is in the cutoff state.

Further, the input impedance of the first voltage detection circuit 11 needs to be larger than the impedance of the snubber circuit 22 when the dimmer 5 is not operating, and therefore the resistance R1
It is possible to reduce the power consumption, reduce the heat generation, and reduce the size. Furthermore, in the second voltage detection circuit 12, its input impedance needs to be smaller than the impedance of the snubber circuit 22, and for this reason, the capacitor C1 is used to be capacitive,
This also makes it possible to suppress heat generation and achieve miniaturization.

Further, as described above, the input impedance of the first voltage detection circuit 11 is selected to be large and the input impedance of the second voltage detection circuit 12 is selected to be small as compared with the impedance of the snubber circuit 22, and thus the presence or absence of the lighting load 7 is selected. Regardless of this, it is possible to accurately electrically detect that the breaker 6 is in the cutoff state.

Furthermore, the voltage detection level V _ZD1 may be set by using a diamond Q3 as shown by the first voltage detection circuit 11c in FIG. 5, and similarly, the voltage detection level V _ZD1 may be set.
_{ZD2 may} be set by a diamond Q4, as shown by the second voltage detection circuit 12c in FIG.

As described above, according to the present invention, it is possible to accurately detect conduction / interruption of the breaker 6 regardless of the presence or absence of the illumination load 7.

Further, according to the present invention, the resistance value of the second resistor R1 provided in the first voltage detection circuit 11 is selected so that the input impedance of the first voltage detection circuit 11 is larger than the impedance of the snubber circuit 22. That is, the resistance value of the second resistor R1 is increased, thereby lowering heat generation and enabling miniaturization.

Furthermore, according to the present invention, the reactance (1 / ωC1) of the second capacitor C1 included in the second voltage detection circuit 12 is
The input impedance of the second voltage detection circuit 12 is selected to be smaller than the impedance of the snubber circuit 22,
That is, the reactance of the second capacitor C1 is reduced,
As a result, a reliable operation can be realized regardless of the presence or absence of the lighting load 7.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a light control device 1 according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram showing a specific configuration of the light control device 1, and FIGS. FIG. 5 is a waveform diagram for explaining the operation, FIG. 5 is an electric circuit diagram of a first voltage detection circuit 11c according to another embodiment of the present invention, and FIG. 6 is a second voltage detection circuit according to yet another embodiment of the present invention. It is an electric circuit diagram of 12c. 1 ... Dimmer, 4 ... Power supply, 5 ... Dimmer, 6 ... Breaker, 7 ... Lighting load, 11, 11a, 11c ... First voltage detection circuit, 12, 12a, 12c. Second voltage detection circuit, 13 ... Judgment circuit, 14 ... Display device

Claims (2)

[Claims] 1. A power supply line 2 of an AC power supply 4, a triac Q0, a breaker 6, a lighting load 7, and a power supply line 3 of the other side of the AC power supply 4 are connected in this order to form a closed loop. The drive circuit 21 for controlling the conduction angle of the triac Q0 is provided, and the first resistor R0 and the first capacitor are provided in parallel with the triac Q0.
A snubber circuit 22 configured by connecting C0 in series is connected, and between the first voltage detection circuit 11 and the first connection point 8 between the triac Q0 and the breaker 6 and the other power supply line 3. Is connected to the second resistor R1, at the first connection point 8, the first diode D1, the third resistor R2, the first Zener diode ZD1 connected in the reverse direction to the first diode D1, and The first voltage detection circuit 11 and the second voltage detection circuit 12 are configured such that the base of the first transistor Q1 is connected in this order, and one output end of the first transistor Q1 is connected to the other power supply line 3. , Breaker 6 and lighting load 7
Between the second connection point 9 and the other power supply line 3,
A second capacitor C1 is connected, a second diode D2, a fourth resistor R3, a second zener diode ZD2 connected in a reverse direction to the second diode D2, and a second diode D2 at a second connection point 9.
The base of the transistor Q2 is connected in this order, and the second
One output terminal of the transistor Q2 is connected to the other power supply line 3, a second voltage detection circuit 12, an inverter gate IC1 for inverting the output of the other output terminal of the first transistor Q1, and the other of the second transistor Q2. The impedance of the lighting load 7 includes the AND gate IC2 to which the output of the output end and the output of the inverter gate IC1 are given, and the display element D3 which is turned on or off depending on the level of the output of the AND gate IC2. It is selected to be sufficiently lower than the impedance of 22 and the resistance value of the second resistor R1 is selected so that the input impedance of the first voltage detection circuit 11 is larger than the impedance of the snubber circuit 22 and is lower than the resistance value of the third resistor R2. Select sufficiently small, reactance of the second capacitor C1 (1 / ωC1)
Is selected so that the input impedance of the second voltage detection circuit 12 is smaller than the impedance of the snubber circuit 22,
A dimmer which is selected to be sufficiently smaller than the resistance value of the fourth resistor R3. 2. A closed loop is formed by connecting one power supply line 2 of an AC power supply 4, a triac Q0, a breaker 6, a lighting load 7, and the other power supply line 3 of the AC power supply 4 in this order. The drive circuit 21 for controlling the conduction angle of the triac Q0 is provided, and the first resistor R0 and the first capacitor are provided in parallel with the triac Q0.
A snubber circuit 22 configured by connecting C0 in series is connected, and between the first voltage detection circuit 11 and the first connection point 8 between the triac Q0 and the breaker 6 and the other power supply line 3. Is connected to the second resistor R1, and the first connection point 8 is connected to the first diode D1, the third resistor R2, the first diode Q3, and the first resistor D1.
The base of the transistor Q1 is connected in this order, and
One output terminal of the transistor Q1 is connected to the other power supply line 3 to form a first voltage detection circuit 11 and a second voltage detection circuit 12, which are a breaker 6 and a lighting load 7.
Between the second connection point 9 and the other power supply line 3,
The second capacitor C1 is connected, the second diode D2, the fourth resistor R3, the second diode Q4, and the base of the second transistor Q2 are connected in this order at the second connection point 9, and the second transistor C2 is connected. A second voltage detection circuit 12 configured by connecting one output terminal of Q2 to the other power supply line 3, an inverter gate IC1 that inverts the output of the other output terminal of the first transistor Q1, and the other output of the second transistor Q2. The impedance of the lighting load 7 includes the AND gate IC2 to which the end output and the output of the inverter gate IC1 are given, and the display element D3 which is turned on or off according to the output level of the AND gate IC2. Sufficiently lower than the impedance of the second resistor R1 and the resistance value of the second resistor R1 so that the input impedance of the first voltage detection circuit 11 is larger than the impedance of the snubber circuit 22. And select sufficiently smaller than the resistance value of the third resistor R2, the reactance of the second capacitor C1 (1 / ωC1)
Is selected so that the input impedance of the second voltage detection circuit 12 is smaller than the impedance of the snubber circuit 22,
A dimmer which is selected to be sufficiently smaller than the resistance value of the fourth resistor R3.