JP3465441B2 - Lighting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention uses a timer device.
The lighting device that was used .

[0002]

[Prior art]

(1) Related to a timer device.

Conventionally, there is a timer device used for an illuminating device, which has a function of changing a charge amount during charging of a capacitor. A circuit diagram thereof is shown in FIG. 6 and an operation waveform diagram thereof is shown in FIG. (First Conventional Example) This circuit includes switching elements Q1 to Q3 and a capacitor C.
1, resistor R1, constant current source a, b, comparator COMPa, C
One capacitor C including OMPb
One can count two times.

The operation will be briefly described with reference to FIG. When the input signal Sin becomes high (H) level, the switching element Q1 is turned on, the capacitor C1 is charged by the constant current source a, and as shown in FIG. 7B, the voltage across the capacitor C1 (hereinafter referred to as voltage). ..) The comparator COMPa outputs a low (L) level signal (= output signal Sa) for the time t1 until Vc1 reaches the reference voltage Va, and counts the time t1. If the time t1 is counted, the comparator C
The output signal Sa of OMPa is inverted from the L level to the H level, the switching element Q2 is turned on, the constant current source b is also operated, and the capacitor C1 is charged by the constant current source a and the constant current source b. As shown in 7 (c), the comparator COMPb outputs a low (L) level signal (= output signal Sb) for the time t2 until the voltage Vc1 reaches the reference voltage Vb, and counts the time t2. After counting the time t2, the voltage Vc1 is clamped by the clamp circuit 1a. At the time of reset, the switching element Q is driven by the reset signal Sr.
3 is turned on, and the charge of the capacitor C1 is extracted via the discharge resistor R1.

However, the first conventional example has the following first problem. In this conventional example, it is possible to count two times with one capacitor C1 by changing the charging current value, but since both times are counted during charging of the capacitor C1, time t1 and time t2 are almost equal to each other. Must be continuous. Therefore, for example, it is suitable for preheating control at the time of starting the lamp, but is not suitable when it is necessary to count discontinuous times.

Therefore, time t1 is required when the capacitor is charged.
Has a circuit configuration in which the time t2 is counted when the capacitor is discharged, there is a circuit that can count discontinuous time with each other. An example of the circuit diagram is shown in FIG. 8 and an operation waveform diagram thereof is shown in FIG. . (Second Conventional Example) This circuit includes resistors R11, R12, capacitors C2, switching elements Q11, Q12, comparators COMPc, NO.
It is composed at least of the T gate N1.

Next, the operation will be briefly described with reference to FIG. As shown in FIG. 9B, when the input signal Sin becomes H level, the switching element Q11 is turned on, the switching element Q12 is turned off, and the capacitor C2 is charged at a rate determined by the time constant of the capacitor C2 and the resistor R11. As shown in 9 (a), the voltage across the capacitor C2 (hereinafter,
Called voltage. ) Vc2 rises. The upper limit voltage of the voltage Vc2 is the control voltage Vcc of the current supply source. When the input signal Sin becomes L level, the switching element Q11
Is turned off, the switching element Q12 is turned on, the electric charge of the capacitor C2 is discharged at a rate determined by the time constant of the capacitor C2 and the resistor R12, and the voltage Vc2 decreases as shown in FIG. 9A.

The reference voltage Vs of the comparator COMPc is the voltage VSH and the voltage VS according to the output signal Sc of the comparator COMPc.
It takes a binary value of L (<voltage VSH), and counts time t1 from the start of charging the capacitor C2 until the voltage Vc2 reaches the voltage VSH, and the time from the start of discharging the capacitor C2 until the voltage Vc2 reaches the voltage VSL. By counting t2, the output signal Sc as shown in FIG. 9C can be obtained. Here, the voltages VSH and VSL, the charging resistor R1
1. The time t1 and the time t2 can be freely set by changing the value of the discharge resistance R12. By using such a circuit, it becomes possible to obtain a signal having a constant delay time from the input signal Sin.

(2) A lighting device. There are many lighting devices using a timer device. For example, in a lighting device configured to include an emergency light, when switching between two modes, a mode in which a lighting load is normally turned on when the AC power supply is normal and a mode in which the lighting load is emergency turned on when the AC power is shut off, Some use a timer device.

FIG. 10 shows a configuration example thereof, and FIG. 11 shows an operation waveform diagram thereof. This circuit includes AND gates AN1, N
OR gate NOR1, switching elements Q21, Q22
And an inverter circuit INV for emergency lighting for emergency lighting of the lighting load by controlling the switching elements Q21 and Q22.
And a relay contact Ry for switching between the normal lighting circuit that normally lights the lighting load and the emergency lighting inverter circuit INV.
It controls the and.

The operation will be briefly described with reference to FIG.
In this circuit, a power failure detection signal S1 generated by detecting the interruption of the AC power supply and a fixed time t1 from the power failure detection signal S1
1 is combined with the delay signal S2 generated with a delay of
The emergency lighting inverter circuit INV and the relay contact R are controlled by controlling the switching element Q21 and the switching element Q22 at the timings shown in the operation waveform diagram of FIG.
Control y.

That is, the power failure detection signal S1 and the delay signal S2
If both are L level, the AND gate AN1 outputs an L level signal, the NOR gate NOR1 outputs an H level signal, and the switching element Q21 is turned off and the switching element Q22 is turned on. The emergency lighting inverter circuit INV is stopped as shown in FIG.
The relay contact Ry is operated as shown in 1 (d).

Power failure detection signal S1 is H level, delay signal S
2 is L level, or power failure detection signal S1 is L level,
If the delay signal S2 is H level, AND gates AN1, NO
The R gate NOR1 outputs an L level signal to turn off both the switching elements Q21 and Q22, thereby stopping the emergency lighting inverter circuit INV and the relay contact Ry as shown in FIGS. 11 (c) and 11 (d).

If both the power failure detection signal S1 and the delay signal S2 are H level, the AND gate AN1 outputs an H level signal, and the NOR gate NOR1 outputs an L level signal to turn on the switching element Q21 and turn on the switching element Q22. By turning off, the inverter circuit INV for emergency lighting is oscillated as shown in FIG. 11 (c) to illuminate the lighting load, and the relay contact Ry is stopped as shown in FIG. 11 (d).

If, for example, a timer device as shown in FIGS. 8 and 9 is used in the circuit for generating the delay signal S2,
As described above, it is possible to switch between the two modes of normal lighting and emergency lighting.

[0016]

However, the second conventional example has the following second problem.

Since the capacitor C2 is charged and discharged with a time constant, it takes time to reach a fully charged or fully discharged state. Therefore, as shown in FIG.
When n is switched to a high frequency, the predetermined times t1 and t2 cannot be reliably obtained as shown in FIG.
In some cases, only times t11, t12, etc. shorter than 1, t2 can be obtained.

Further, in the third conventional example, the following third problem will occur. If a timer device based on CR charging / discharging is used in the circuit for generating the delay signal S2
When the second problem as described above occurs and the times t1 and t2 are shortened as in the second problem, the relay contact Ry is normally turned on while the emergency lighting inverter circuit INV is operating. There is a possibility that switching will occur and an arc will be drawn at the relay contact Ry to cause welding of the relay contact Ry.

The present invention has been made in view of the above problems, and an object thereof is to provide a timer device capable of counting a predetermined time even if an input signal is inverted at a high frequency, and a timer device using this timer device. An object of the present invention is to provide a lighting device capable of reliably switching lighting between lighting and emergency lighting and preventing welding of relay contacts.

[0020]

In order to solve the above-mentioned problems, according to the invention of claim 1, the AC power supply is normally operated.
The normal lighting circuit that normally lights the lighting load, and the AC
Emergency lighting for emergency lighting of the lighting load when the power is cut off
Inverter circuit, the normal lighting circuit and the emergency lighting
Equipped with a relay contact that switches with the inverter circuit for
After a certain period of time has passed since the AC power interruption was detected, the
The relay contact is activated, and from the end of the relay contact operation
Operate the emergency lighting inverter circuit after a certain period of time
In order to count the fixed time in the lighting device
The input signal and the reference signal with a specified value are compared and output to
A timer device for counting a number of hours,
When the value of the force signal reaches the predetermined value, the input signal
Increase or decrease in the same direction and increase or decrease
Change rate before the value of the input signal reaches the predetermined value
It is characterized in that it is provided with a timer device that is larger than the above.

According to a second aspect of the present invention, the illumination negative
The load is a discharge lamp.

According to the invention of claim 3, the timer device counts a plurality of times which are not continuous with each other.
It is characterized by being a thing.

According to the invention of claim 4, the timer is provided.
-The device includes a capacitor and the input
The signal is obtained from the change in voltage across the capacitor.
And characterized in that.

The reference signal has at least two predetermined values.
And wherein the one having.

[0025]

[0026]

[Embodiment]

(Embodiment 1) FIG. 1 shows a circuit diagram of a first embodiment according to the present invention, and FIG. 2 shows an operation waveform diagram thereof.

The difference from the first and second conventional examples shown in FIGS. 6 and 8 is that there are two constant current sources (2
a, 2c) and two constant current sources for discharging (2b, 2d). The circuit shown in FIG. 1 is NOR.
Gate NOR2, AND gate AN2, NOT gate N
2, switching elements Q31 to Q34, constant current source 2a to
2d, a capacitor C3, clamp circuits 1b and 1c, and a comparator COMPd. Here, the constant current source 2a
Between 2d, 2c >> 2a, 2d >> 2b, 2b> 2a (1). Further, the reference voltage Vs of the comparator COMPd is the voltage VSH, V which changes according to the output signal Sd.
It has two values of SL (voltage VSH> voltage VSL).

Next, the operation will be briefly described with reference to FIG. When the input signal Sin is at the L level and the output signal Sd is at the H level, the switching element Q31 turns on and the switching elements Q32 to Q34 turn off, so that 2a of the four constant current sources operates and 2b to 2d stop. As a result, the capacitor C3 is charged, and the time t1 until the voltage across the capacitor C3 (hereinafter referred to as voltage) Vc3 reaches the reference voltage (hereinafter referred to as voltage) VSH of the comparator COMPd is counted.

When the voltage Vc3 reaches the voltage VSH, the output of the comparator COMPd is inverted and the output signal Sd becomes L level, and at the same time, the reference voltage becomes the voltage VSL. In this case, the switching elements Q31, Q33 are turned on, the switching elements Q32, Q34 are turned off, and the constant current sources 2a, 2
By operating c, the capacitor C3 is changed to (2a + 2
Charging is performed faster than time t1 with the constant current of c). Voltage V
c3 is clamped at a constant voltage VCLH by the clamp circuit 1b.

When the input signal Sin is inverted to H level,
The switching elements Q31 and Q32 are turned on, the switching elements Q33 and Q34 are turned off, the constant current sources 2a and 2b are operated, and the constant current sources 2c and 2d are stopped. The time t2 until the voltage Vc3 reaches the voltage VSL is extracted by the constant current (2b-2a). When the voltage Vc3 reaches the voltage VSL, the output of the comparator COMPd is inverted and the output signal S
At the same time when d becomes H level, the reference voltage becomes VSH.
Becomes

When the voltage Vc3 reaches the voltage VSL, both the input signal Sin and the output signal Sd become H level, the switching elements Q31 and Q33 are turned off, and the switching element Q is turned off.
Since 32 and Q34 are turned on, 2 out of 4 constant current sources
a and 2c stop, 2b and 2d operate, and the capacitor C
The electric charge charged in 3 is discharged at a constant current of (2b + 2d) more rapidly than time t2. The voltage Vc3 is clamped at the constant voltage VCLL by the clamp circuit 1c.

In this way, the voltage Vc3 changes to the comparator COMPd.
After reaching the reference voltage VSH or the reference voltage VSL, that is, after the times t1 and t2 are counted, the inclination of the charge / discharge of the capacitor C3 is rapidly changed. Voltage V
The time required to reach CLH or the voltage VCLL can be shortened, that is, the time required to reach a state of substantially full charge and substantially complete discharge can be shortened, and the input signal Sin can be reduced.
Even if (= power failure detection signal) is inverted at a high frequency, the specified delay times t1 and t2 can be obtained. Also, at times t1 and t
If the input signal Sin is inverted while counting 2, the charging / discharging direction is reversed to rapidly charge / discharge, so that the times t1 and t2 can be immediately reset.

(Second Embodiment) A circuit diagram of a second embodiment according to the present invention is shown in FIG. 3, and an operation waveform diagram thereof is shown in FIG.

The difference from the first embodiment shown in FIG. 1 is that the switching element Q31 is omitted and the constant current source 2a is always in the operating state, and the constant current sources 2c and 2d are connected to the resistors R2c and R2d. Instead, the reference voltage of the comparator COMPd is not provided with hysteresis (VSH, VSL) and only the reference voltage Vs is set to one value to simplify the circuit.

In this embodiment, the operation of counting the times t1 and t2 is the same as that in the first embodiment, but the rapid charging and the rapid discharging of the capacitor C3 after the counting of the times t1 and t2 are performed by the resistor R2c, The difference is that the time constants of R2d and capacitor C3 are used. By reducing the time constant, the time required to charge and discharge the capacitor C3 can be shortened. Therefore, as in the first embodiment, the input signal Sin is reduced.
Even if is inverted at a high frequency, the specified delay times t1 and t2 can be obtained.

At least one of the constant current sources 2c and 2d shown in FIG. 1 may be replaced with a resistor.

(Third Embodiment) FIG. 5 shows a circuit diagram of a third embodiment according to the present invention.

The present embodiment is an example in which the timer device shown in the first and second embodiments is applied to a lighting device, and an emergency light is shown here.

In this circuit, the power failure detection circuit 10 uses an AC power source V
Power failure signal S obtained by detecting the presence or absence of ac
1 and the delay signal S set by the timer device 11
2 is input to the control circuit 12, and the control circuit 12 operates a lighting switching circuit (for example, a relay contact) Ry to normally light the lighting load (for example, a discharge lamp) La during normal operation of the AC power supply Vac. Then, when the AC power supply Vac is cut off, the lighting load La is switched on to the emergency lighting inverter circuit INV for emergency lighting to switch between the normal lighting state and the emergency lighting state. Here, the control circuit 12 separates the AC power supply Vac from the secondary battery BATT which is charged by the charging circuit 1 via the diode D3 during the normal operation of the AC power supply Vac.
1, the rectifier DB, the diode D1, and the DC power obtained by rectifying and smoothing through the power supply smoothing capacitor CH to operate the emergency lighting inverter circuit INV. The control circuit 12 may be a circuit as shown in FIG. 10, for example.

With this structure, the AC power source V
Even if an abnormality such as chattering occurs in ac, the specified delay time can be obtained, so that the operation shown in the timing chart of FIG. 11 can be reliably performed, and the operation can be switched between normal lighting and emergency lighting. The reliability can be improved.

[0041]

According to the inventions of claims 1 to 5 , even if the input signal is inverted at a high frequency, a predetermined time is counted.
Of normal lighting and emergency lighting using a timer device that can
For reliable switching of lighting to prevent welding of relay contacts
It is possible to provide a lighting device that can further improve reliability .

[0042]

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment according to the present invention.

FIG. 2 shows an operation waveform diagram according to the above embodiment.

FIG. 3 is a circuit diagram showing a second embodiment according to the present invention.

FIG. 4 shows an operation waveform diagram according to the above embodiment.

FIG. 5 is a circuit diagram showing a third embodiment according to the present invention.

FIG. 6 is a circuit diagram showing a first conventional example according to the present invention.

FIG. 7 shows an operation waveform diagram according to the conventional example.

FIG. 8 is a circuit diagram showing a second conventional example according to the present invention.

FIG. 9 shows an operation waveform diagram according to the conventional example.

FIG. 10 is a configuration diagram showing a second conventional example according to the present invention.

FIG. 11 shows an operation waveform diagram according to the conventional example.

FIG. 12 shows another operation waveform diagram according to the second conventional example.

[Explanation of symbols]

11 Timer device 13 Normal lighting circuit C capacitor INV Emergency lighting inverter circuit La lighting load Ry relay contact S signal V voltage

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H03K 17/296 H02J 9/02 H05B 41/14 310

Claims (5)

(57) [Claims] 1. A lighting load is normally turned on when the AC power supply is normal.
The normal lighting circuit that activates the
An emergency lighting inverter circuit that lights a light load in an emergency
Of the normal lighting circuit and the emergency lighting inverter circuit
It is equipped with a relay contact for switching and shuts off the AC power supply.
Operate the relay contact after a certain time after detection,
After a certain period of time from the end of the operation of the relay contact, the emergency
In the lighting device that operates the lighting inverter circuit,
Input signal and predetermined value are required to count the fixed time.
Compare and output the reference signal to count multiple times
A timer device, wherein the value of the input signal is the predetermined value
When the value is reached, the increasing or decreasing direction of the input signal is
Enter the same change rate of increase or decrease
The value of the signal is made larger than that before reaching the predetermined value.
Lighting apparatus characterized in that a timer device. 2. The lighting load is a discharge lamp
The lighting device according to claim 1 . 3. The timer devices are not continuous with each other
The lighting device according to claim 1, wherein the lighting device counts a plurality of times . 4. The timer device includes a capacitor.
And the input signal is applied to both of the capacitors.
The lighting device according to claim 1 or 2, wherein the lighting device is obtained from a change in end voltage . 5. The reference signal is at least two predetermined values.
According claim 1, characterized in that those having a
Item 4. The lighting device according to any one of items 3 .