JPS63250091A - Controller of halogen lamp - 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 (Industrial Application Field) This invention is mainly used as a light source for photopolymerization equipment, and is also applicable to halogen This invention relates to a lamp control device.

(Prior Art) Conventionally known control devices of this type include the following.

A. As shown in Figure 6, a voltage E' (approximately the rated voltage E (V) of the halogen lamp (3) is applied from the secondary side of the transformer (1) through the irradiation on/off switch (2). V) configured to be added to the halogen lamp (3).

B. As shown in Fig. 7, a halogen lamp (3) is turned on by phase control using a triac (4) to realize foot voltage.
Integrating circuit (5) that detects the voltage between the terminals of and integrates it.
and a comparator (5) that compares the output of the integrating circuit (5) with a reference f1 corresponding to the rated voltage of the Haloken lamp (3).
and a phase control controller (7) that changes the conduction angle of the triac (11) based on the output of the comparator (6) so that the output from the integration circuit (5) matches the reference value. This circuit is equipped with a circuit consisting of the following circuits.

(Problems to be Solved by the Invention) Among the conventional devices having the configuration as described above, A is directly affected by fluctuations in the power supply voltage. In other words, when the internal pressure increases, the secondary voltage of the transformer also increases in proportion to it. Excessive pressure is applied to the Haloken lamp, and if the lamp burns out prematurely, the life of the lamp will be significantly reduced. Furthermore, as the power supply voltage decreases, the voltage applied to the halogen lamp also decreases, which reduces the radiant flux and light from the halogen lamp. As a result, when used as a light source in a photopolymerization device, there is a drawback that the curing performance decreases in proportion to the brightness.

In addition, the smell C of B is proportional to the life of the halogen lamp or the effective value voltage to the 113th power, and considering that it is proportional to the power rather than the voltage, that is, the power OC (effective value voltage) / Since it is a filament resistor, it is not practical to maintain a constant voltage like B, and it is impossible to achieve a high luminous flux and curing performance.

This invention was made in view of the actual situation as described in 1-1 above.
Moreover, it is an object of the present invention to provide a control device for a halogen lamp that can extend the life of the lamp.

In order to achieve the object of item I, the halogen lamp control device according to the present invention provides
A voltage detection circuit that detects the ft voltage and a voltage detection circuit that detects the ft voltage.
A squaring circuit that multiplies the power, an integrating circuit that integrates its output, and a comparator that compares the output of this integrating circuit with a reference value.
It is characterized by being equipped with a feedback circuit consisting of a phase control controller that changes the conduction angle of the triac so that the output from the integrating circuit shown below matches the reference value above, and a Kate circuit that turns on the triac using the output of the controller. shall be.

(Function) According to the present invention, the voltage between the terminals of the phase-controlled Haloken lamp is detected, and the detected voltage is passed through the square circuit and the integrating circuit, thereby increasing the square of the instantaneous value of the effective voltage which is proportional to the electric power. The integrated voltage is obtained. By changing the conduction angle of the triac via the phase control controller so that this voltage matches the reference value set to correspond to the rated power of the halogen lamp, the halogen lamp can be used regardless of fluctuations in the power supply voltage. As a result, the power consumption is always feedback-controlled to a constant level.

(Example) Hereinafter, an example of this emission ψ1 will be described based on the IJ plane.

FIG. 1 is a block diagram of a control device for a halogen lamp according to the present invention. ) divides the circuit-1-1 to the most appropriate voltage. (9) is a squaring circuit that squares the detected divided voltage, and this squaring circuit (9) has an internal voltage dividing circuit to prevent saturation of the output which increases due to the squaring. .

(10) is an integration circuit that integrates the squared voltage, (11
) is the output of the above integration circuit (10) and the halogen lamp (3
), and if there is a difference between the two, that is, the output of the integrating circuit (10) and the reference value, due to fluctuations in the power supply voltage, etc., the error amplifier ( 12), the conduction angle of the triac (4) is changed via the phase control controller (7) and the gate circuit (13) to correct the difference, that is, the output of the integrating circuit (10) is adjusted to -・It is configured to perform feedback control to achieve the desired results.

In addition, (4) in the figure shows the halogen lamp (3) immediately after lighting.
During the transition period when the resistance of the filament increases to a constant value due to temperature A, the halogen lamp (3
) is a soft start circuit that works to gradually bring the supply voltage to ``-H'' to the rough 1 to star 1 to circuits (1
4) is a resistor (R) and a capacitor (
C) and a soft star controller (15) with a time constant determined by C).

Next, the operation of the above configuration will be explained.

The voltage between the terminals of the halogen lamp (3) whose phase is controlled by the triac (4) is detected through the voltage divider circuit (8), and the effective value of the voltage Vrn+s at this time is Vrms = 5]πax, sin low.・・・・・・・・・
... ■However, θZ is the conduction angle E max and is the power supply voltage. (See Figure 3(a)) Then, the detected voltage is input to the square circuit (9),
The effective value voltage is squared, Vrms” = *S:x(Emax, sinθ)”d
O・・・-・-・・ ■. (See Figure 3(b)) Here, the voltage between the power P and the terminals of the halogen lamp (3),
In other words, the relationship with the effective value voltage Vrms is P= ~rms
”/R・・・・・・・・・・・・ (■However, R is the filament resistance, so if the resistance R is constant, P〆Vrms ・・・・・・・・・
... becomes ■, and from the formula ■, [stock], P OCS: (Emax, sinθ)2dθ...
. . . . . . ■ If the resistance R is constant, it can be seen that the electric power P is proportional to the instantaneous value Ema of the voltage and the integral of the square of sin θ.

Therefore, if there is a fluctuation in the power supply voltage Emax,
Depending on the fluctuation of the power supply voltage, the right side of the equation 0 is compared with the base value, and based on the output from this comparator (11),
Triac (4) via phase control controller (7)
) by performing feedback control to change the conduction angle OZ, the left side of equation (5), that is, the power P, is kept constant. In other words, as shown in Fig. 4 (a), when the power supply voltage increases by △V with respect to the reference value, the conduction angle O1 is adjusted as shown in Fig. 4 (1) to compensate for that F prefecture. , △θZ to the right, and as shown in FIG. As shown in Figure (b), it is shifted by ΔO7.

As described above, control is performed so that a constant amount of power is always supplied to the halogen lamp (3) even if the power supply voltage fluctuates in either the rising or falling direction.

The above explanation is for controlling the constant lighting state of the halogen lamp (3) when the filament resistance R reaches a certain value, that is, the constant lighting state C of the halogen lamp (3). In the transition period of upward change,
The above soft start circuit (14) gradually reduces the power consumption of the halogen lamp (3) to hJ? By performing control such that the feedback control is performed smoothly, the transition to the desired feedback control can be performed smoothly.

(Effects of the Invention) As is already clear from the explanation in section L below, according to the present invention, feedback control is performed so that the power is always maintained at the set value by phase control using the triac, so the power supply voltage It is possible to stabilize the radiant flux and luminous flux of the halogen lamp at the set value regardless of fluctuations in the halogen lamp, and also achieve the effect of extending the lamp life by reliably preventing the application of overvoltage to the lamp.

In particular, when used as a light source for a photopolymerization device, stabilization of the luminous flux can improve curing performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of a soft start circuit, and FIGS. 3(a) and (b)
) to FIGS. 5(a) and (I) are voltage waveform diagrams for explaining the operation, and FIGS. 6 and 7 are block diagrams of conventional examples, respectively. (Explanation of symbols) (3) is a halogen lamp, (4) is a triac, (7
) is a phase control controller, (8) is a voltage divider circuit, (9)
is a square circuit, (10) is an integration circuit, (13) is a gate circuit, and (14) is a soft start circuit. -1-1 Patent Applicant Sori Seisakusho Co., Ltd. Patent Attorney (6235) Hidehiko Matsuno Procedural Amendment (Senior Restraint May 13, 1985 1, Indication of Case 1982 Patent Application No. 082454 2) , Title of the invention: Control device for halogen lamps 3, Relationship to the person making the amendment Applicant's address: 680 Higashihama Minami-cho, Fushimi-ku, Kyoto Name: Morita Co., Ltd. President and CEO Mori 1) Takabetsu 4, Agent: 550-5, Date of amendment order (voluntary) 6. Number of inventions increased by amendment: None 8. The description of the contents of the amendment is amended as follows. (1) “p cx4 V rm S” on page 8, line 4
Correct J as li'Pc(V rms2j.

Claims (3)

[Claims] (1) Compare the voltage detection circuit that detects the voltage between the terminals of the halogen lamp, the squaring circuit that squares the detected voltage, the integrating circuit that integrates the output, and the output of this integrating circuit with a reference value. It is equipped with a feedback circuit consisting of a comparator, a phase control controller that changes the conduction angle of the triac so that the output from the integrating circuit matches the reference value, and a gate circuit that turns on the triac using the output of the controller. A halogen lamp control device characterized by: (2) Claim 1 incorporates a soft start circuit that gradually increases the voltage supplied to the halogen lamp until the temperature of the lamp filament reaches a set value.
A control device for a halogen lamp as described in . (3) The control device for a halogen lamp according to claim 1 or 2, wherein the halogen lamp in question is a light source of a photopolymerization device.