JP3463609B2 - Discharge lamp lighting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for starting and lighting a high intensity discharge lamp (HID lamp) such as a metal halide.

[0002]

2. Description of the Related Art A high-intensity discharge lamp such as a metal halide has a characteristic that when the lamp temperature is cold, the rise of the light output from start to stable lighting is delayed. Therefore, when such a high-intensity discharge lamp is used as a light source for a vehicle headlamp or a liquid crystal projector, various measures are usually taken to improve the rise of light output.

For example, Japanese Patent Laid-Open No. 141988/1992 discloses a power change rate reducing means for moderately changing the change rate of the power supplied to the discharge lamp with respect to the lamp voltage when shifting from the light emission promoting area to the constant power control area. There is disclosed a lighting circuit for a vehicle discharge lamp, which is provided with such a light source and reduces the time required for the luminous flux of the discharge lamp to stabilize.

Further, in Japanese Patent Laid-Open No. 9-82480,
Lamp voltage conversion means for converting the lamp voltage into a value corresponding to the value and outputting the lamp voltage, lamp current detection means for detecting the lamp current, and power control for controlling the lamp power supply means by receiving the output signals of these means. And a means for controlling the lamp supply power by sequentially shifting to various control areas from the start of lighting the discharge lamp.

In these publications, the required lamp current value with respect to the lamp voltage is defined. In any of the inventions described above, the emission promotion region (control region) is defined in the lamp voltage-lamp current characteristic, and the lamp The rise of the light output is improved by temporarily increasing the current level. However, in the methods described in these publications, a circuit for setting the characteristic curve of the lamp voltage-lamp current is required, and there is a problem that the momentum circuit becomes complicated.

FIG. 7 is a configuration diagram of a conventional discharge lamp lighting device capable of improving the rise of light output with a simple circuit configuration. However, FIG. 7B to FIG.
It is each waveform diagram of the input signal of an inversion operation part in (a), an output signal, and an output signal of an electric power command operation part.

The discharge lamp lighting device shown in FIG. 7 includes a DC power source E, a high-intensity discharge lamp DL as a load, and DC-DC.
It is composed of a converter 1, a starting lighting circuit 2, a power supply voltage monitoring unit 5, and a control circuit 10PA. However, SW1 provided between the DC power supply E and the DC-DC converter 1 is a power switch.

The DC-DC converter 1 is composed of a circuit such as a buck-boost or flyback type, and outputs the output voltage of the DC power source E at a predetermined (desired) level within a range from a lower level to a higher level. It is converted into voltage.

The start-up lighting circuit 2 is provided between the DC-DC converter 1 and the high-intensity discharge lamp DL, and has a DC-D.
The high-intensity discharge lamp DL is started and lit by using the DC power from the C converter 1, and in the example of FIG.
Inverter 3 that converts the DC power from the DC-DC converter 1 into AC power and supplies the AC power to the high-intensity discharge lamp DL.
And an igniter 4 that applies a high voltage to the high-intensity discharge lamp DL at startup.

The power supply voltage monitoring unit 5 includes a power switch SW1.
Is turned on and the DC power supply E is turned on, DC-DC
The lighting permission signal S5 is output to both the converter 1 and the control circuit 10PA to start the operation.

The control circuit 10PA is a high-intensity discharge lamp DL.
Lamp voltage and lamp current are detected, and the output power of the DC-DC converter 1 is controlled according to the detection results. In the example of FIG. 7, the power shift command generator 11 and the power command calculator 12 The maximum power limiting unit 13, the voltage detecting unit 14, the current detecting unit 15, the current command calculating unit 17, the maximum current limiting unit 18, and the error amplifier 19. Hereinafter, each of these parts will be described in principle.

The power shift command generator 11 is a DC-DC
The converter 1 is made to output the electric power corresponding to the maximum output of the high-intensity discharge lamp DL at the time of starting to improve the rise of the light output, while the electric power corresponding to the rated output of the high-intensity discharge lamp DL is outputted at the time of stable lighting. The electric power shift amount command signal S11 which is the basis for the operation is generated. In the example of FIG. 7, the power shift command generation unit 11 includes a switch SW11 that is turned on when the lighting permission signal S5 is output from the power supply voltage monitoring unit 5 in order to generate the signal shown in FIG. 7B. A resistor R111 whose other end is grounded to which a voltage Vref from a charging circuit (not shown) is applied to one end via the switch SW11, and a resistor R112 and a capacitor C111 which are connected in parallel with the resistor R111 in series are provided. Resistance R112 and capacitor C
The signal shown in FIG. 7 (b) output from the connection point of 111 is inverted to generate the power shift amount command signal S1 shown in FIG. 7 (c).
An inversion calculation unit 111 that obtains 1 and outputs it is provided.
However, the power shift command generation unit 11 is set so that the power shift amount command signal S11 has a predetermined value exceeding the maximum output when the voltage across the capacitor C111 immediately after starting is zero. As a result, as shown in FIG. 7C, the power shift amount command signal S11 exceeds the maximum output level for a predetermined time TM1 after the switch SW11 is turned on.

As shown in FIG. 7 (d), the power command calculation unit 12 responds to the power shift amount command signal S11 from the power shift command generation unit 11 by a rating corresponding to the rated output of the high-intensity discharge lamp DL. The output power command signal is added to generate and output the output power command signal S12.

The maximum power limiter 13 is a power command calculator 1
Output power command signal S12 from the high-intensity discharge lamp D
The output power is limited to the maximum output of L or less (with limitation) and output as the output power command signal S13 . Voltage-detection unit 14
Is DC- as the lamp voltage of the high-intensity discharge lamp DL.
The output voltage of the DC converter 1 is detected to detect the detection signal S14.
Is output.

The current detector 15 is a high-intensity discharge lamp DL.
As the lamp current, the output current of the DC-DC converter 1 is detected by voltage and the detection signal S15 is output.

The current command calculation unit 17 includes a maximum power limiter 1
The output power command signal S13 corresponding to the desired lamp power from 3 is divided by the detection signal S14 corresponding to the lamp voltage from the voltage detection unit 14 to obtain and output the output current command signal S17 corresponding to the lamp current. Is.

The maximum current limiter 18 is a current command calculator 1
The output current command signal S17 from the output current command signal S1 is limited to a predetermined maximum current level or less (with a limit).
It is output as 8.

The error amplifier 19 compares the detection signal S15 from the current detecting section 15 with the reference output current command signal S18 from the maximum current limiting section 18, and outputs the detection signal S15 corresponding to this output current command signal S18. The DC-DC converter 1 generates the output control signal S19 according to the error amount.
Is output to.

Next, the operation of the discharge lamp lighting device having the above configuration will be outlined. When the power switch SW1 is turned on, the power supply voltage monitoring unit 5 outputs a lighting permission signal S5, which causes the DC-DC converter 1 and the control circuit 10PA.
Both start.

When the control circuit 10PA is activated, that is, the switch SW11 is turned on, the power shift command generator 11 generates and outputs the power shift amount command signal S11. This power shift amount command signal S11 becomes the output power command signal S12 by adding the rated output power command signal at the power command calculation unit 12, and becomes the output power command signal S13 after being limited by the maximum power restriction unit 13.

On the other hand, the voltage detector 14 and the current detector 1
5, the output voltage and the output current of the DC-DC converter 1 are detected as the lamp voltage and the lamp current of the high-intensity discharge lamp DL, respectively, and the detection signals S14 and S15 are detected.
Is output.

Of these detection signals S14 and S15, the detection signal S14 (the value thereof) is the output power command signal S13 described above.
It is taken into the current command calculator 17 together with (value of) and used in the division process to generate the output current command signal S17. The output current command signal S17 is output to the maximum current limiting unit 18
Then, the output current command signal S18 is obtained.

Of the detection signals S14 and S15, the detection signal S15 is taken into the error amplifier 19 together with the output current command signal S18, and the error component of the detection signal S15 with respect to the output current command signal S18 is amplified to output control signal S19.
Is output to the DC-DC converter 1.

As a result, the DC-DC converter 1
Since the electric power corresponding to the maximum output is output for the predetermined time TM1 from the start time, it is possible to improve the rise of the optical output. When the lamp voltage is low, the lamp current increases, but the input current to the inverter 3,
That is, the output current is limited to be equal to or less than the maximum output current.

After that, when the output power command signal S13 becomes less than the maximum output (after the elapse of the predetermined time TM1), the output power command signal S13 drops in a waveform corresponding to the waveform of the charging voltage of the capacitor C111
When the charging voltage of the capacitor C111 reaches the voltage Vref, it reaches the rated output level and stabilizes at this level.
As a result, the high-intensity discharge lamp DL is stably turned on.

After that, when the power switch SW1 is turned off, the capacitor C111 is discharged through the resistors R111 and R112. As a result, at the time of relighting when the power switch SW1 is turned on again, the capacitor C1 is
11 is charged again, and the circuit operation similar to the above is performed.

[0027]

However, the conventional discharge lamp lighting device shown in FIG. 7 adopts the control of the lamp power as shown in FIG. 8 (a) to improve the rise of the light output at the time of starting. Although you can
There is a problem that the impedance (R2) of the starting lighting circuit 2 adversely affects the improvement. That is, DC-D
When controlling the output power while observing the output of the C converter 1, since the impedance of the starting lighting circuit 2 is about several Ω, it does not matter at the rated lighting, but immediately after lighting, as shown in FIG. As shown, the lamp impedance R _DL is much lower than when stable, so the impedance of the starting lighting circuit 2 has an effect, and as a result, the control circuit 10
This is because the power command set by PA will not be fully utilized for the high-intensity discharge lamp DL.

In order to solve such a problem,
Conventionally, the impedance of the starting lighting circuit 2 is estimated, and a correction signal having an appropriate value is added to the affected power shift amount command signal or output power command signal immediately after lighting. Then, the control circuit becomes complicated, and the power range to be controlled for adding the correction signal is widened and the dynamic range is narrowed. As a result, another problem arises that the control circuit becomes weak against variations and noise.

The present invention has been made in view of the above circumstances, and suppresses the influence of the impedance of the starting lighting circuit from starting to stable lighting while maintaining the dynamic range without widening the power range to be controlled. An object of the present invention is to provide a discharge lamp lighting device capable of suitably improving the rise of light output.

[0030]

[SUMMARY OF] inventions of claim 1, wherein in order to solve the above problems, D converting the high intensity discharge lamp, a DC power supply, the output voltage of the DC power supply to the dc voltage
A C-DC converter, and the DC-DC converter provided between the DC-DC converter and the high-intensity discharge lamp.
And igniting circuit that performs starting and lighting of the high intensity discharge lamp using a direct current power from the converter, before Symbol DC-
Constituted by a control circuit for controlling the output of the DC converter
And the control circuit controls the lamp of the high-intensity discharge lamp.
As the voltage, the output voltage of the DC-DC converter is detected.
And a high-brightness detector that outputs the first detection signal.
As the lamp current of the discharge lamp.
A battery that detects the output current of the burner and outputs the second detection signal.
Current detector and an output power finger corresponding to the desired lamp power.
The lamp signal is divided by the signal from the voltage detection unit.
Current command to obtain and output the output current command signal corresponding to the current
The calculation unit, the signal from the current detection unit and the current command performance
Compared with the signal from the calculation unit, from the current command calculation unit
Corresponding to the error amount of the signal from the current detecting section with respect to the signal of
The DC-DC converter for generating the same output control signal
A discharge lamp lighting device including an error amplifier for outputting to
And a multiplying means for multiplying the second detection signal by a predetermined value and outputting it.
And interposed between the voltage detection unit and the current command calculation unit
The output signal of the multiplying means from the first detection signal
A correction unit composed of subtraction means for subtracting and outputting
Further, the output signal of the multiplication means is the predetermined multiplication factor.
Due to the impedance of the starting lighting circuit, the first
Do not set it so that it is the level of the component generated in the detection signal.
It characterized the Rukoto.

In this configuration, since the component generated in the lamp voltage detected by the voltage detection unit due to the impedance of the starting lighting circuit is corrected, the dynamic range is maintained while the power width to be controlled is not widened. From the start to the stable lighting, the influence of the impedance of the starting lighting circuit can be suppressed, and the rise of the light output can be suitably improved.

The invention according to claim 2 is a high-intensity discharge lamp.
And a DC power supply, and the output voltage of the DC power supply to a DC voltage
DC-DC converter for converting, and the DC-DC converter
Installed between the burner and the high-intensity discharge lamp,
Using the DC power from the DC-DC converter, the high brightness
Start lighting circuit that starts and lights the discharge lamp every time,
A control circuit for controlling the output of the DC-DC converter;
And the control circuit controls the high-intensity discharge run.
The output voltage of the DC-DC converter is
Voltage detection unit that detects a force voltage and outputs a first detection signal
And the lamp current of the high-intensity discharge lamp is D
The second detection signal by detecting the output current of the C-DC converter
Corresponding to the desired lamp power.
Output power command signal divided by the signal from the voltage detector
And output the output current command signal corresponding to the lamp current.
Current command calculation unit, and the signal from the current detection unit
The signal from the current command calculator is compared to
Signal from the current detection unit in response to the signal from the command calculation unit
Of the DC-D by generating an output control signal according to the error amount of
Discharge lamp including error amplifier for outputting to C converter
A lighting device, wherein the voltage detector is connected to the DC-DC
Of one output terminal of the converter and the current command calculation unit
Consists of amplification means with input and output connected to each
Between the output of the current detection unit and the input side of the amplification means.
The second detection signal is input between the amplifier and the amplifier.
A current that reduces the output level of the means is applied to the amplifying means.
The output unit of the amplifying means is further provided with a correction unit for flowing to the force side.
The falling width of the bell is the impedance of the starting lighting circuit
To be a component generated in the first detection signal due to
It is characterized by being set. With this configuration, the component generated in the lamp voltage detected by the voltage detection unit due to the impedance of the starting lighting circuit is reduced and corrected, so that the dynamic range is maintained without widening the power range to be controlled, and It is possible to suppress the influence of the impedance of the start-up lighting circuit during stable lighting and suitably improve the rise of the light output.

The invention according to claim 3 is the discharge according to claim 2.
In electric lamp lighting device, before Symbol corrector, the second test
Output signal, impedance of the starting lighting circuit and the
The output level of the amplifying means depends on the input resistance of the amplifying means.
The resistance of the resistor is
The width of decrease in the output level of the amplifying means depends on the starting lighting time.
Occurs in the first detection signal due to the impedance of the path
It is characterized in that it is set so as to become a component. Even with this configuration, it is possible to suppress the influence of the impedance of the starting lighting circuit from start to stable lighting while maintaining the dynamic range without widening the power range to be controlled, and to suitably improve the rise of the light output. Become.

[0034]

1 is a block diagram of a discharge lamp lighting device according to a first embodiment of the present invention. The first embodiment will be described below with reference to this drawing.

The discharge lamp lighting device shown in FIG. 1 includes a DC power source E, a power switch SW1, and high-intensity discharge lamps DL and D.
The C-DC converter 1, the starting lighting circuit 2, and the power supply voltage monitoring unit 5 are provided in the same manner as in the conventional discharge lamp lighting device shown in FIG. 7, and the difference from the conventional discharge lamp lighting device is DC-DC. Control circuit 10 for converter 1
Is equipped with.

The control circuit 10 includes a power shift command generator 11, a power command calculator 12, a maximum power limiter 13, a voltage detector 14, a current detector 15, a current command calculator 17, and an error amplifier shown in FIG. In addition to 19, the voltage detection unit 1
4 and the current command calculation unit 17 are provided with a voltage correction unit 16. However, the current command calculator 17 divides the output power command signal S13 from the maximum power limiter 13 by the detection correction signal S16 from the voltage corrector 16 to obtain and output the output current command signal S17. Also, the error amplifier 1
Reference numeral 9 denotes an output current command signal S1 from the current command calculation unit 17.
The output control signal S19 corresponding to the error amount of the detection signal S15 from the current detection unit 15 for 7 is generated and output to the DC-DC converter 1. Note that the control circuit 10 may be configured to further include the maximum current limiting unit 18, as in FIG. 7.

Here, the impedance between the DC-DC converter 1 and the high-intensity discharge lamp DL, that is, the impedance R2 of the starting lighting circuit 2 is, in addition to the inverter 3 and the igniter 4, the components of the noise filter circuit, the socket and the It is caused by harnesses, etc., and generally becomes about several Ω. As described above, the impedance R2 does not cause a problem at the time of rated lighting, but immediately after lighting, the lamp impedance R _DL becomes much lower than that at the time of stabilization, so that the influence of the impedance R2 cannot be ignored and the control circuit There arises a problem that the power command set in 10 is not sufficiently utilized for the high-intensity discharge lamp DL.

Therefore, in the first embodiment, the current detector 1
Using the detection signal as the lamp current from 5, the voltage detection unit 14 is caused by the impedance of the starting lighting circuit 2.
The voltage correction unit 16 that corrects the component (error component) generated in the detection signal as the lamp voltage detected by the above to obtain and output the detection correction signal S16 is provided.

Next, the operation of the control circuit 10, which is a characteristic part of the first embodiment, will be described. Power shift command generator 11
When the switch SW11 is turned on, the power shift command generator 11 generates and outputs the power shift amount command signal S11. This power shift amount command signal S11
In the power command calculation unit 12, the rated output power command signal is added to become the output power command signal S12, and the maximum power restriction unit 13 limits the output power command signal S13.

On the other hand, the voltage detector 14 and the current detector 1
5, the output voltage and the output current of the DC-DC converter 1 are detected as the lamp voltage and the lamp current of the high-intensity discharge lamp DL, respectively, and the detection signals S14 and S15 are detected.
Is output.

Of the detection signals S14 and S15, the detection signal S14 is corrected by the voltage correction section 16 as a component caused by the impedance of the starting lighting circuit 2 and output as a detection correction signal S16. This detection correction signal S16
Is the current command calculator 1 together with the output power command signal S13.
The output current command signal S17 is generated by being taken into 7 and used for the division processing.

Of the detection signals S14 and S15, the detection signal S15 is taken into the error amplifier 19 together with the output current command signal S17, and the error component of the detection signal S15 with respect to the output current command signal S17 is amplified to output control signal S19.
Is output to the DC-DC converter 1. The operation thereafter is the same as that of the conventional discharge lamp lighting device shown in FIG.

From the above, the DC-DC converter 1 is
Since the electric power corresponding to the maximum output is output for a predetermined time from the start time, it is possible to improve the rise of the optical output. Further, since the component in the detection signal S14 caused by the impedance of the starting lighting circuit 2 is corrected, the electric power command set by the control circuit 10 is sufficiently utilized for the high-intensity discharge lamp DL. As a result, with a simple circuit configuration, while maintaining the dynamic range without widening the power range to be controlled, the effect of the impedance of the starting lighting circuit is suppressed from start to stable lighting, and the rise of the light output is improved appropriately. It becomes possible to do. Further, by adjusting the rated output by the current command calculation unit 17, it is possible to correct deviations and variations in the current command calculation unit 17 and the output power command, and it is possible to improve the accuracy of power control. .

FIG. 2 is a diagram showing a voltage correction unit and the like in a discharge lamp lighting device according to a second embodiment of the present invention. The second embodiment will be described below with reference to this drawing.

This discharge lamp lighting device comprises a DC power source E, a power switch SW1, a high-intensity discharge lamp DL, and DC-DC.
Converter 1, start lighting circuit 2 and power supply voltage monitoring unit 5
Is provided in the same manner as in the first embodiment, and a control circuit 20 is provided as a difference from the first embodiment.

The control circuit 20 includes a power shift command generator 11, a power command calculator 12, a maximum power limiter 13, a voltage detector 14, a current detector 15, a current command calculator 17, and an error amplifier 19 as a first circuit. In addition to having the same configuration as the embodiment, the voltage correction unit 26 is provided as a feature of the second embodiment. However, the current command calculator 17 uses the output power command signal S13 from the maximum power limiter 13 as the voltage corrector 26.
Then, the output current command signal S17 is obtained by division by the detection correction signal S26 from S.

The voltage correction unit 26 uses the detection signal S15 as the lamp current from the current detection unit 15 to detect the lamp voltage detected by the voltage detection unit 14 due to the impedance of the starting lighting circuit 2. The component generated in the signal S14 is corrected to obtain and output the detection correction signal S26. In the example of FIG. 2, the multiplier 261 that multiplies the detection signal S15 by k and outputs it, and the detection signal S of the voltage detection unit 14.
14 and the subtracter 262 which subtracts the output signal of the multiplier 261 to obtain and output the detection correction signal S26.

Here, the multiplication factor k of the multiplier 261 is set so that the output signal of the multiplier 261 becomes equal to the level of the component generated in the detection signal S14 due to the impedance of the starting lighting circuit 2.

As a result, the detection signal S of the voltage detector 14 is detected.
14, the subtractor 262 removes (or reduces: the same applies hereinafter) the component caused by the impedance of the starting lighting circuit 2 by subtraction. Therefore, the detection correction signal S26 obtained by removing the component is used as a current command. Computing unit 17
If you input to, while maintaining the dynamic range without expanding the power range to be controlled, from the start to stable lighting,
It is possible to suppress the influence of the impedance of the starting lighting circuit and suitably improve the rise of the optical output.

FIG. 3 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit and the like in a discharge lamp lighting device according to a third embodiment of the present invention. The third embodiment will be described below with reference to this drawing. I do.

This discharge lamp lighting device comprises a DC power source E, a power switch SW1, a high-intensity discharge lamp DL, and DC-DC.
Converter 1, start lighting circuit 2 and power supply voltage monitoring unit 5
Is provided in the same manner as in the first embodiment, and a control circuit 30 is provided as a difference from the first embodiment. However, DC
The output voltage of the DC converter 1 becomes a negative voltage. That is, DC-DC in which the output terminal T2 is grounded as in FIG.
The other output terminal T1 of the converter 1 has a negative potential.

The control circuit 30 includes the power shift command generator 1
1, a power command calculator 12, a maximum power limiter 13, a current command calculator 17, and an error amplifier 19 are provided as in the first embodiment, and the features of the third embodiment are a voltage detector 34 and a current detector. 35 and a voltage correction unit 36. However, the current command calculation unit 17 outputs the output power command signal S13 from the maximum power restriction unit 13 to the voltage detection unit 3.
It is divided by the detection correction signal S34 from 4 to obtain and output the output current command signal S17. Further, the error amplifier 19 generates an output control signal S19 according to the error amount of the detection signal S35 from the current detection unit 35 with respect to the output current command signal S17 from the current command calculation unit 17, and outputs it to the DC-DC converter 1. To do.

The voltage detecting section 34 includes resistors R341 and R342 forming an inverting amplifier and an operational amplifier 341, for example.
The output voltage of the DC-DC converter 1 is detected as the lamp voltage of the high-intensity discharge lamp DL and the detection correction signal S34 is output. However, one end of the resistor R341 serving as the input terminal of the inverting amplifier is DC
-It is connected to the output terminal T1 of the DC converter 1.

The current detecting section 35 includes a resistor R351 interposed between the ground to which the output terminal T2 of the DC-DC converter 1 is connected and the starting lighting circuit 2, resistors R352 and R353 forming an inverting amplifier, and For example, the operational amplifier 351 is provided, which detects the output current of the DC-DC converter 1 as a lamp current of the high-intensity discharge lamp DL with a voltage and outputs a detection signal S35. However, one end of the resistor R352, which serves as an input terminal of the inverting amplifier of the current detection unit 35, is connected to a connection point between the resistor R351 and the starting lighting circuit 2.

The voltage correction unit 36 uses the detection signal S35 as the lamp current from the current detection unit 35 to detect the lamp voltage detected by the voltage detection unit 34 due to the impedance of the starting lighting circuit 2. It is intended to correct the component generated in the signal. In the example of FIG. 3, the voltage correction unit 3
6 is an inverting input terminal of the operational amplifier 341 and the operational amplifier 3
It is composed of a resistor R36 connected between the output terminal 51 and the output terminal 51.

By connecting the resistor R36 in this manner, a current flows through the inverting input terminal of the inverting amplifier of the voltage detecting section 34, so that the current flowing through the resistor R342 decreases. That is, the output level of the operational amplifier 341 drops due to the detection signal S35, the impedance R2 of the starting lighting circuit 2, and the resistor R341. Therefore, the impedance R2 and the resistor R341 of the starting lighting circuit 2 are set so that the fall width corresponds to the component generated in the detection signal as the lamp voltage detected by the voltage detection unit 34 due to the impedance of the starting lighting circuit 2. Considering resistance R
When the value of 36 is determined, the above-mentioned component can be removed from the detection signal to obtain the detection correction signal S34.

Accordingly, if the detection correction signal S34 is input to the current command calculation unit 17, the impedance of the starting lighting circuit changes from the starting to the stable lighting while maintaining the dynamic range without expanding the power width to be controlled. It is possible to suppress the influence and suitably improve the rise of the optical output.

Further, by disposing the resistor R351 near the operational amplifier 351 side or on a small board on which the operational amplifier 351 is mounted, the wiring distance between the resistor R351 and the operational amplifier 351 is shortened and the influence of noise is exerted. Can be suppressed, and the accuracy of power control can be improved.

FIG. 4 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit and the like in a discharge lamp lighting device according to a fourth embodiment of the present invention. The fourth embodiment will be described below with reference to this drawing. I do.

This discharge lamp lighting device comprises a DC power source E, a power switch SW1, a high-intensity discharge lamp DL, and DC-DC.
Converter 1, start lighting circuit 2 and power supply voltage monitoring unit 5
Is provided in the same manner as in the third embodiment, and a control circuit 40 is provided as a difference from the third embodiment.

This control circuit 40 includes a power shift command generator 11, a power command calculator 12, a maximum power limiter 13, a voltage detector 34, a voltage corrector 36, a current command calculator 17 and an error amplifier 19. In addition to providing the same as the embodiment, the current detecting unit 45 is provided as a feature of the fourth embodiment. However, the error amplifier 19 is used in the current command calculation unit 1
Current detector 4 for the output current command signal S17 from
The output control signal S19 corresponding to the error amount of the detection signal S45 from 5 is generated and output to the DC-DC converter 1.

The current detecting section 45 includes a resistor R451 interposed between a ground to which the output terminal T2 of the DC-DC converter 1 is connected and the output terminal T2 thereof, resistors R452 and R453 constituting an amplifier, and, for example, Operational amplifier 4
51, which detects the output current of the DC-DC converter 1 as a lamp current of the high-intensity discharge lamp DL with a voltage and outputs a detection signal S45. That is, in the fourth embodiment, the polarity of the detection target is opposite to that in the third embodiment due to the interposed position of the resistor R451 and the detection point thereof, so that the current detection unit 45 is provided with an amplifier instead of an inverting amplifier. is there.

Therefore, the operation of the voltage detector 34 and the voltage corrector 36 is exactly the same as that of the third embodiment,
As a result, it is possible to suppress the influence of the impedance of the start lighting circuit from start to stable lighting while maintaining the dynamic range without expanding the power width to be controlled, and to suitably improve the rise of the light output. .

FIG. 5 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit, etc. in a discharge lamp lighting device according to a fifth embodiment of the present invention. The fifth embodiment will be described below with reference to this drawing. I do.

This discharge lamp lighting device comprises a DC power source E, a power switch SW1, a high-intensity discharge lamp DL, and DC-DC.
Converter 1, start lighting circuit 2 and power supply voltage monitoring unit 5
Is provided in the same manner as in the first embodiment, and a control circuit 50 is provided as a difference from the first embodiment. However, DC
The output voltage of the DC converter 1 is a positive voltage as in the first embodiment. That is, similarly to FIG. 1, the other output terminal T1 of the DC-DC converter 1 whose output terminal T2 is grounded has a positive potential.

The control circuit 50 includes the power shift command generator 1
1, a power command calculator 12, a maximum power limiter 13, a current command calculator 17, and an error amplifier 19 are provided as in the first embodiment, and the features of the fifth embodiment are a voltage detector 54 and a current detector. 55 and a voltage correction unit 56. However, the current command calculation unit 17 outputs the output power command signal S13 from the maximum power limit unit 13 to the voltage detection unit 5.
It is divided by the detection correction signal S54 from 4 to obtain and output the output current command signal S17. Further, the error amplifier 19 generates an output control signal S19 according to the error amount of the detection signal S55 from the current detection unit 55 with respect to the output current command signal S17 from the current command calculation unit 17, and outputs it to the DC-DC converter 1. To do.

The voltage detecting section 54 is composed of resistors R541 and R542 which form an amplifier and an operational amplifier 541, for example, which is D as the lamp voltage of the high-intensity discharge lamp DL.
The output voltage of the C-DC converter 1 is detected and the detection correction signal S54 is output. However, one end of the resistor R541 which is the input terminal of the amplifier is connected to the output terminal T1 of the DC-DC converter 1.

The current detecting section 55 has a resistor R451 interposed between a ground to which the output terminal T2 of the DC-DC converter 1 is connected and the output terminal T2 thereof, resistors R352 and R353 constituting an inverting amplifier, and For example, it is composed of an operational amplifier 351 and detects the output current of the DC-DC converter 1 as a lamp current of the high-intensity discharge lamp DL with a voltage and outputs a detection signal S55. However, one end of the resistor R352 that serves as an input terminal of the inverting amplifier of the current detection unit 55 is connected to the output terminal T2 of the DC-DC converter 1.

The voltage correction unit 56 uses the detection signal S55 as the lamp current from the current detection unit 55 to detect the lamp voltage detected by the voltage detection unit 54 due to the impedance of the starting lighting circuit 2. It is intended to correct the component generated in the signal. In the example of FIG. 5, the voltage correction unit 5
Reference numeral 6 includes a resistor R561 and transistors Q561 and Q562 having a current mirror circuit configuration.

By thus configuring the voltage correction unit 56, a current flows through the input terminal of the amplifier of the voltage detection unit 54, so that the current flowing through the resistor R542 decreases and the output level of the operational amplifier 541 drops. Therefore, the third
Similar to the embodiment, if the value of the resistor R561 is determined in consideration of the impedance R2 and the resistors R541 and R542 so that the fall width corresponds to the component caused by the impedance of the starting lighting circuit 2, the above component is obtained. It is possible to obtain the detection correction signal S54 from which is removed.

Accordingly, if the detection correction signal S54 is input to the current command calculation unit 17, the impedance of the starting lighting circuit changes from the starting to the stable lighting while maintaining the dynamic range without expanding the power width to be controlled. It is possible to suppress the influence and suitably improve the rise of the optical output.

FIG. 6 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit and the like in a discharge lamp lighting device according to a sixth embodiment of the present invention. The sixth embodiment will be described below with reference to this drawing. I do.

This discharge lamp lighting device comprises a DC power source E, a power switch SW1, a high-intensity discharge lamp DL, and DC-DC.
Converter 1, start lighting circuit 2 and power supply voltage monitoring unit 5
Is provided in the same manner as in the fifth embodiment, and a control circuit 60 is provided as a difference from the fifth embodiment.

The control circuit 60 includes a power shift command generator 11, a power command calculator 12, a maximum power limiter 13, a voltage detector 54, a voltage corrector 56, a current command calculator 17, and an error amplifier 19. The sixth embodiment is provided with a current detector 65 as a feature of the sixth embodiment, as well as the same as the embodiment. However, the error amplifier 19 is used in the current command calculation unit 1
Current detector 6 for the output current command signal S17 from
The output control signal S19 corresponding to the error amount of the detection signal S65 from 5 is generated and output to the DC-DC converter 1.

The current detecting section 65 includes a resistor R351 provided between the ground to which the output terminal T2 of the DC-DC converter 1 is connected and the start-up lighting circuit 2, resistors R452 and R453 which form an amplifier, and, for example, Operational amplifier 45
The output current of the DC-DC converter 1 is detected by a voltage as a lamp current of the high-intensity discharge lamp DL, and a detection signal S65 is output. That is,
In the sixth embodiment, the polarity of the detection target is opposite to that in the fifth embodiment depending on the position where the resistor R351 is provided and the detection point thereof. Therefore, the amplifier is not the inverting amplifier but the current detector 65.
Is equipped with.

Therefore, the operation of the voltage detector 54 and the voltage corrector 56 is exactly the same as that of the fifth embodiment.
As a result, it is possible to suppress the influence of the impedance of the start lighting circuit from start to stable lighting while maintaining the dynamic range without expanding the power width to be controlled, and to suitably improve the rise of the light output. .

[0077]

[0078]

[0079]

According to the present invention, while maintaining the dynamic range without increasing the power range should Gyosu braking, toward the stable lighting from the start, to suppress the influence of impedance of the igniting circuit, the rise of light output It becomes possible to improve suitably.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a discharge lamp lighting device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a voltage correction unit and the like in a discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit, and the like in a discharge lamp lighting device according to a third embodiment of the present invention.

FIG. 4 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit, and the like in a discharge lamp lighting device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit and the like in a discharge lamp lighting device according to a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a voltage detection unit, a current detection unit, a voltage correction unit and the like in a discharge lamp lighting device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional discharge lamp lighting device capable of improving the rise of light output with a simple circuit configuration.

FIG. 8 is a diagram showing how lamp power control and lamp impedance fluctuations occur in the discharge lamp lighting device shown in FIG.

[Explanation of symbols]

E DC power supply SW1 power switch DL high intensity discharge lamp 1 DC-DC converter 2 Start lighting circuit 3 inverter 4 Igniter 5 Power supply voltage monitor 10, 20, 30, 40, 50, 60 Control circuit 11 Electric power shift command generator 12 Power command calculator 13 Maximum power limiter 14, 34, 54 Voltage detector 15, 35, 45, 55, 65 Current detector 16, 26, 36, 56 Voltage correction unit 17 Current command calculator 19 Error amplifier

Continuation of the front page (56) Reference JP-A-7-337024 (JP, A) JP-A-8-8087 (JP, A) JP-A-7-135086 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) H05B 41/282

Claims (3)

(57) [Claims] And 1. A high intensity discharge lamp, through between a DC power source, a DC-DC converter that converts the dc voltage the output voltage of the DC power supply, and the DC-DC converter and the high-intensity discharge lamp is set, is constituted by a control circuit for the igniting circuit that performs starting and lighting of the high intensity discharge lamp using the DC power from the DC-DC converter, the output control of the previous SL DC-DC converter, wherein The control circuit controls the lamp voltage of the high-intensity discharge lamp and
Then, by detecting the output voltage of the DC-DC converter,
A voltage detection unit that outputs a first detection signal, and the high-intensity discharge
As the lamp current of the lamp, the DC-DC converter
Current detection that detects the output current of the
Section and output power command signal corresponding to the desired lamp power
Is divided by the signal from the voltage detector to obtain the lamp current
Current command calculator that receives and outputs the corresponding output current command signal
And the signal from the current detector and the current command calculator
The signal from the current command calculator is compared with those signals.
Output according to the error amount of the signal from the current detection unit with respect to
Generate a force control signal and output it to the DC-DC converter
A discharge lamp lighting device including an error amplifier for operating the second detection signal,
Interposed between the voltage detection unit and the current command calculation unit,
Subtract the output signal of the multiplication means from the first detection signal
And a subtraction means for outputting
The output signal of the multiplying means is provided with the predetermined lighting for the start-up lighting.
Due to the impedance of the circuit,
Characterized by setting so that the level of the component to be twisted
A discharge lamp lighting device. 2. A high-intensity discharge lamp, a DC power supply, and
DC-DC converter that converts the output voltage of a DC power supply into a DC voltage
Converter, the DC-DC converter, and the high-brightness discharge
And a DC-DC converter provided between the electric lamp and the electric lamp.
Using the DC power from the
And a starting lighting circuit for lighting, and the DC-DC converter
A control circuit for controlling the output of the high-intensity discharge lamp.
Then, by detecting the output voltage of the DC-DC converter,
A voltage detection unit that outputs a first detection signal, and the high- intensity discharge
As the lamp current of the lamp, the DC-DC converter
Current detection that detects the output current of the
Section and output power command signal corresponding to the desired lamp power
Is divided by the signal from the voltage detector to obtain the lamp current
Current command calculator that receives and outputs the corresponding output current command signal
And the signal from the current detector and the current command calculator
The signal from the current command calculator is compared with those signals.
Output according to the error amount of the signal from the current detection unit with respect to
Generate a force control signal and output it to the DC-DC converter
A discharge lamp lighting device including an error amplifier for operating the voltage detecting unit,
Input and output to the input terminals of the input terminals
Force is connected between the output of the current detector and the input side of the amplifying means.
The amplifying means is interposed and receives the second detection signal.
The input side of the amplifying means to reduce the output level of
Further comprising a correction unit that causes the output level of the amplification means to fall within the range of the start-up lighting.
Due to the impedance of the circuit,
A discharge lamp lighting device , characterized in that it is set so as to have a twisting component . 3. A front Symbol corrector, the second detection signal, the
Impedance of starting lighting circuit and turning on of the amplifying means
Is constituted by <br/> lowering resistance output level of said amplifying means by the force resistance, the value of the resistor drops the output level of said amplifying means
Due to the impedance of the starting lighting circuit
This ing set to be a component occurring in the first detection signal
The discharge lamp lighting device according to claim 2, wherein: