JP2003297595A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an HID lamp light source device avoided from disorder caused by acoustic resonance. <P>SOLUTION: For the light source device composed of a discharge lamp having a pair of electrodes facing each other, and a power supplying device (Ex) supplying discharge current to the electrodes, the power supplying device (Ex) uses a switching element controlling the amount of current supplied to the discharge lamp, and frequency modulation is added to the almost periodical switching movement of the switching element. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
High-pressure mercury discharge lamps used as light sources for
High-intensity discharge lamps such as metal halide lamps (HID lamps)
Lamp) using the light source device. [0002] Liquid crystal projectors and DLPs ^TM (Texa
Instruments) for optical devices such as projectors
In the light source device, a discharge lamp such as an HID lamp
Is used. Regarding the operation of the discharge lamp,
The polarity of the bipolar electrodes, i.e., one cathode and the other positive
DC drive where the relationship of poles does not change, and the relationship between the cathode and anode
There is an AC drive in which engagement is changed substantially periodically. AC
In driving, the speed of the polarity change, that is, the driving cycle
Wave numbers can range from tens of hertz to several megahertz.
Driving at a low frequency is possible. By the way, in such a discharge lamp,
Indicates that the discharge space works as an acoustic resonant cavity,
If the resonance frequency matches the frequency component of the feed current or
When approaching, a phenomenon called acoustic resonance occurs. [0004] Generally, the resonance frequency depends on the shape of the lamp.
There are several types depending on the resonance frequency.
Method and the sound velocity of the gas in the discharge space.
Even if the lamp type is the same for each type, the shape of the discharge space
Resonance frequency for each lamp if there is variation in the shape
Changes, and even for the same lamp, the temperature of the lamp
Changes, the resonance frequency changes. [0005] The resonance is driven regardless of the driving method of the power supply device.
For the current ripple component and its harmonic components of the dynamic frequency
Occurs. [0006] When acoustic resonance occurs, a smell occurs in the discharge space.
Of the projector screen due to the discharge arc vibrating
If the flicker appears every time or is severe, discharge may occur.
It may go out. As mentioned above,
The sound frequency changes variously according to the lamp conditions,
Because it resonates with various frequency components of the power feeding device,
Stabilizes the acoustic resonance frequency of the pump and the frequency component of the power feeding device
It was very difficult to separate them. In the prior art, for example, Japanese Patent Application Laid-Open No. 63-5 / 1988
No. 8793, the frequency of the ripple component and the ripple rate
Although limiting is disclosed, as mentioned above,
Reduce the acoustic resonance frequency of the lamp and the frequency component of the power supply.
Where separation is difficult,
There were also cases. Further, for example, Japanese Patent Application Laid-Open No. 60-262392
In the frequency band where no acoustic resonance occurs,
That can switch between frequency bands that can be generated at predetermined intervals.
Frequency band that is disclosed but does not cause any acoustic resonance
Not applicable if does not exist. Japanese Translation of PCT International Publication No. 2001-505360 and rice
In the National Patent Office Patent No. 5859505, the lamp point
One that measures lamp stability and dynamically switches the frequency
Although it is disclosed, there are problems that the structure is complicated and costly
there were. SUMMARY OF THE INVENTION The present invention provides an acoustic resonance
To provide an HID lamp light source device which avoids inconvenience
With the goal. [0010] In order to solve this problem,
Further, the present invention provides a discharge lamp in which a pair of electrodes are arranged to face each other.
Start the discharge lamp and supply a discharge current to the electrode.
Light source device connected to a power supply device (Ex) for supplying power
The power supply device (Ex) is provided with the discharge lamp
Use switching elements to adjust the amount of power supplied to
A substantially periodic switch of the switching element.
It is characterized by adding frequency modulation to
Is what you do. FIG. 1 shows the present invention using the above-described DC drive system.
1 shows a simplified example of the configuration of the light source device. Power supply equipment
(Ex), step-down chopper type ballast circuit
(Bx) is a voltage supplied from a DC power supply (Mx) such as PFC.
Operates in response to power supply and adjusts the amount of power supplied to the discharge lamp (Ld)
I do. In the ballast circuit (Bx), the FET
DC power supply (Mx) by switch element (Qx)
To turn on and off the current through the choke coil (Lx)
And the smoothing capacitor (Cx) is charged.
Is applied to the discharge lamp (Ld), and the discharge lamp (Ld)
It is configured such that a current can be passed through it. The switch element (Qx) is turned on.
The period of the state is determined by the current through the switching element (Qx).
Directly by charging and loading the smoothing capacitor (Cx)
When a current is supplied to a certain discharge lamp (Ld)
The energy in the form of magnetic flux to the choke coil (Lx)
When the switch element (Qx) is in the off state,
Energy stored in the form of magnetic flux in the choke coil (Lx)
Via a flywheel diode (Dx)
To charge and discharge the smoothing capacitor (Cx)
The current supply to d) is performed. The step-down chopper type ballast circuit (B)
x), the operation cycle of the switch element (Qx)
, The period when the switch element (Qx) is in the ON state
, The duty cycle ratio,
The amount of power supplied to the lamp (Ld) can be adjusted. In the starter (Ui), the resistance (R
via i) the capacitor by the lamp voltage (VL)
(Ci) is charged. Activate the gate drive circuit (Gi)
, A switching element (Qi) composed of a thyristor, etc.
Is turned on, the capacitor (Ci) is switched
Discharge through the primary winding (Pi) of the
A high voltage pulse is generated in the secondary winding (Hi). In the secondary winding (Hi) of the starter (Ui)
The generated high voltage is applied to the output voltage of the ballast circuit (Bx).
Superimposed and applied between the electrodes (E1, E2), the discharge run
Discharge of the pump (Ld) can be started. There is a gate drive signal generation circuit (Upm)
Gate drive signal with duty cycle ratio (Sg)
And the gate drive signal (Sg) is
Through the circuit (Gx), the switching element (Qx)
By controlling the port terminal, the DC power supply (M
On / off of the current from x) is controlled. The electrodes (E1, E) of the discharge lamp (Ld)
2) a lamp current (IL) flowing between the electrodes (E1 and E1);
2) The lamp voltage (VL) generated between the current detection means
Detection by the stage (Ix) and the voltage detection means (Vx)
It is configured to be able to. The current detecting means (I
For x), use a shunt resistor and
The detection means (Vx) can be easily obtained by using a voltage dividing resistor.
Can be realized. The lamp power from the current detecting means (Ix)
Current signal (Si) and the voltage detection means (Vx)
Is supplied to the power supply control circuit (Fx).
The lamp current (IL) and the lamp voltage (VL)
Lamp power so that the product is the expected value.
The target value of the flow signal (Si) is determined, and the target value and the actual measurement value are determined.
The error integration signal (Sf) is adjusted so that the error of
Is done. In the gate drive signal generation circuit (Upm)
The pulse width variation based on the error integration signal (Sf).
Keying to give the proper duty cycle ratio and
The gate drive signal (Sg) controlled in a feedback manner
Generate The claims of the present invention will be described. Said
As described above, the switching element (Qx) switches on and off.
Supply to discharge lamp (Ld) to perform repetitive operation
The current contains a ripple component. Specifically, the switch
When the switch element (Qx) is turned on, the choke coil (L
x) increases substantially linearly.
Therefore, the lamp current also increases substantially linearly, and conversely, the switch
When the switch (Qx) is turned off, the choke coil (L
x) decreases substantially linearly.
Therefore, the lamp current also decreases substantially linearly. That is,
The pump current increases and decreases around a certain average value.
The ripple component is repeated. This ripple component is generated by the discharge lamp (Ld).
If the acoustic resonance frequency matches or approaches
A sound occurs. Generally, resonance phenomena occur in a system near the resonance frequency.
When a periodic disturbance of
This is caused by selectively accumulating keys. But
Therefore, even if the system is given a disturbance consistent with the resonance frequency,
To appear as a harmful degree of resonance,
The growth time of resonance for accumulation of energy,
There will be grace. This is explained by analogy with another resonance phenomenon.
If you do, for example, a pendulum with a weight and a fulcrum
Systems can be mentioned. The oscillation frequency of the pendulum is the length of the thread
This vibration frequency becomes the resonance frequency. At first, assuming that the pendulum is stationary,
At a frequency equal to the frequency, the fulcrum is
When moved flat, resonance causes vibration energy to pendulum
The stationary pendulum gradually increases the amplitude.
Increase, and start moving the fulcrum at the same time.
In addition, the pendulum does not vibrate violently. FIG. 2A shows the switch element according to the present invention.
Frequency modulation for the operation of repeatedly turning on and off the child (Qx)
FIG. 5 is a diagram conceptually showing how the image is given. Note that this frequency
The number modulation is performed by the gate drive signal generation circuit (Up
m), when performing pulse width modulation,
Can be. According to the present invention, the switching element
For the periodic switching operation of (Qx), the period
By changing the period at (τ011), an appropriate
Give a frequency shift of the amount, ie add frequency modulation
As a result, it grew before the period (τ011)
The acoustic resonance of the lamp can be attenuated. This situation is again described in the pendulum example described above.
In other words, moving the fulcrum at the resonance frequency
The vibration of the pendulum, which has begun to increase,
Shift the pendulum amplitude down by shifting it appropriately
Can be Of course, in the period (τ011)
Assuming that the acoustic resonance of the lamp is attenuated by the wave number shift
Eventually, the resonance begins to grow towards an increase,
In the period (τ012) after the appropriate time has elapsed,
A frequency shift must be provided,
The addition of several shifts must be repeated periodically or almost periodically.
It is necessary. Regarding the appropriate value of this repetition frequency,
You need to experiment. Note that the explanation up to this point
As can be seen, according to the present invention, acoustic resonance at a certain frequency
Occurs, but before it grows to a harmful extent
Can be attenuated, so it is expressed in the process of modulation
The frequency is the frequency at which acoustic resonance occurs.
A frequency that does not apply may be used. In the period (τ011, τ012,...)
As for how to give the frequency shift, as shown in FIG.
In addition, there is a shift that attenuates acoustic resonance due to a specific frequency.
In addition to the one that gives a fixed constant frequency,
Between (τ021, τ022,...)
Gives a frequency shifted enough to continuously attenuate acoustic resonance
And a period as shown in FIG. 2c.
Gradual or continuous during all periods
Is given a frequency shifted enough to attenuate acoustic resonance
And can be. FIG. 1 shows a ballast circuit (B
x) that uses a step-down chopper is described.
3 using the step-up chopper shown in FIG.
Using a chopper or other ballast
In a road, a switching element that is substantially periodic by a switching element
The effect of the present invention is well exhibited
Is done. Up to now, based on the DC drive type light source device,
I explained this, but for lighting this kind of discharge lamp
In this case, the effect of lamp current ripple is
The same is true for the object. What happens, for example,
When applying a square-wave AC discharge voltage to the
The half-period period from the inversion to the next inversion is
In the short term there is no difference from DC drive,
The phenomenon that occurs in the case of the DC drive described above is caused by the AC drive.
This is because a case may occur. The step-down chopper as shown in FIG.
After the ballast circuit (Bx), a switch such as FEΤ
Add switch elements (Q1, Q2, Q3, Q4)
By configuring a bridge type inverter (Ub),
The discharge lamp (Ld ')
AC drive type light source device for applying discharge voltage
Of the ballast circuit (Bx)
The switching operation of the switching element (Qx)
The present invention can be applied to
It is exhibited in. The full bridge system shown in FIG.
In the inverter (Ub), a switch such as an FET
Switch element (Q1) and switch element (Q4)
The switching element (Q2) and the switching element (Q
3) The operation of alternately repeating the two states of conducting only
Let them work. At that time, the switch element (Q1) and the switch
The element (Q2) is composed of the switch element (Q3) and the switch element.
Of the two states so as to prevent conduction with the child (Q4) at the same time.
In the interval, for example, no switch element is conducted,
New period is inserted. Such control of each switch element
The control is based on a signal from the inverter control circuit (Fh).
Gate drive circuit (G1, G
2, G3, G4). Of course, the ballast circuit (B
x) is the above-described step-up chopper, inversion chopper, etc.
Of the ballast circuit (Bx)
The present invention is applicable to the switching operation of the switching element.
And the effect is exhibited well. FIG. 5 shows an inverter.
In addition to the full bridge method, such as
The present invention is applied to the case of ridge type, etc.
The effect can be exhibited well. In addition,
When applying the frequency modulation of the present invention, if the frequency characteristics
If there is a peripheral circuit with
Before and after the lamp changes, resulting in a change in lamp brightness.
Problems can occur, but such
In this case, as described above, the effect of the frequency shift can be ignored.
Giving a small shift amount in steps, or
The change speed is so slow that the effect of the frequency change can be ignored.
This problem can be overcome by changing the frequency continuously.
Can be avoided. An embodiment of the present invention will be described. FIG.
The power supply control circuit in the light source device of the present invention shown in FIG.
Path (Fx) and the gate drive signal generation circuit (Upm)
9 shows a simplified configuration example. The lamp voltage signal (Sv) is controlled by an integrated control.
Input to the AD converter (Adc) in the section (Xpu)
And digital lamp voltage data with an appropriate number of digits
(Sxv), converted to a microprocessor unit
(Mpu). Here, the microprocessor unit (M
pu) is a CPU, program memory, data memory,
Clock pulse generation circuit, time counter, digital
It includes an IO controller for inputting and outputting signals. Microprocessor unit (Mpu)
Is calculated with reference to the lamp voltage data (Sxv).
And based on the condition judgment according to the system status at that time,
Chopper for the chopper capacity control circuit (Ud) described
The power control target data (Sxt) is generated. Said cho
The target capacity control data (Sxt) is output from the DA converter (D
ac), the analog chopper capacity control target signal
(St) and converted to chopper capacity control circuit (Ud)
Is entered. Further, the allowable lamp current (IL)
Lamp current upper limit signal for defining upper limit value ILmax
(Sk) is generated by the lamp current upper limit signal generation circuit (Uc).
And input to the chopper capacity control circuit (Ud).
You. In the chopper capacity control circuit (Ud),
Therefore, the chopper capacity control target signal (St) must be
An amplifier or buffer (Ad1) provided as necessary
Via the diode (Dd1), the lamp current
The upper limit signal (Sk) is provided by an amplifier provided as needed or
Through the buffer (Ad2) and the diode (Dd2)
Both are connected to one end of the pull-up resistor (Rd1)
A chopper drive target signal (Sd2) is generated. In addition, before
The other end of the pull-up resistor (Rd1) has an appropriate voltage
To the reference voltage source (Vd1). Therefore, the chopper drive target signal (S
d2) corresponds to the chopper capacity control target signal (St).
Corresponding signal (Sd3) or the lamp current upper limit signal
Any one of the signals (Sd4) corresponding to (Sk) is larger.
The one that is not good is the selected signal. That is, the general control unit (Xpu)
For example, the constant corresponding to the rated power is
To obtain the rated power by dividing by the power (Sxv)
Calculate the value of the pump current (IL), and calculate the value corresponding to this value.
The chopper capability in some way, such as generating as
Assuming that the control target signal (St) has been generated,
Even if appropriate, the chopper capacity control circuit (U
In d), the lamp current (I
L) does not exceed the lamp current upper limit signal (Sk).
, The chopper drive target signal (Sd2) is restricted.
Will be. Incidentally, the above-mentioned AD converter (Adc) and
Control via microprocessor unit (Mpu)
Is slow (or fast, high cost)
Therefore, for example, the discharge state of the lamp does not change suddenly.
If any of the situations occur, the delay
The specified chopper capacity control target signal (St) is inappropriate.
Therefore, such a current limiting function must be implemented in hardware.
Is it necessary to protect the lamps and power supply equipment?
They are also useful. On the other hand, the lamp current signal (Si) is required
An amplifier or buffer (Ad3) provided as necessary
One end is grounded (Gnd) via an ion (Dd3).
x) is connected to the other end of the pull-down resistor (Rd5) connected to
Subsequently, a control target signal (Sd5) is generated. Further, the lamp voltage signal (Sv) is
Compatible with no-load open-circuit voltage by comparator (Cmv)
A voltage of a reference voltage source (Vd2) having a voltage,
If the lamp voltage signal (Sv) is a no-load open voltage
If higher, the transistor (Qd1) is off or
The active state is established, and a resistance is applied from an appropriate voltage source (Vd3).
(Rd4) and the diode (Dd4),
By passing a current through the down resistor (Rd5),
It operates to raise the level of the control target signal (Sd5). Conversely, when the lamp voltage signal (Sv) is
When the voltage is lower than the load release voltage, the transistor (Qd
Since 1) is turned on, the voltage source (Vd3)
Is short-circuited, and the control target signal (Sd5) is
This corresponds to the lamp current signal (Si). What is necessary is that the pull-down resistor (Rd
5), diode (Dd3), diode (Dd4)
The circuit composed of the signals on the anode side of each diode (Sd
6) and the signal (Sd7), whichever is not smaller
The voltage is selected and generated in the pull-down resistor (Rd5)
Because. Note that the comparator (Cmv)
Insert a positive feedback resistor between its output terminal and non-inverting input terminal
(Not shown), the comparison operation has hysteresis.
Unintended when the comparison output changes
The oscillation phenomenon can be prevented. With this configuration, even if the
When the power current almost stops, the lamp current signal (S
Even if i) hardly enters, the lamp power
Pressure signal (Sv) will be higher than the no-load open-circuit voltage
Then, the control target signal (Sd5) rapidly rises.
As a result, the lamp voltage (VL) is substantially no-load open.
Below the voltage, it is always limited by hardware. The chopper drive target signal (Sd2) is
The voltage is divided by the resistance (Rd2) and the resistance (Rd3) to increase the calculation.
It is input to the inverting input terminal of the band (Ade). Meanwhile, before
The control target signal (Sd5) is supplied to the operational amplifier (Ad).
e) is input to the non-inverting input terminal. And the operation
The output of the amplifier (Ade), that is, the error integration signal
(Sf) is the speedup with the integration capacitor (Cd1).
Feedback to the inverting input terminal via the resistor (Rd6).
The operational amplifier (Ade)
The resistance (Rd2) of the chopper drive target signal (Sd2) and the resistance
The control target signal with respect to the divided voltage by the resistance (Rd3)
Signal (Sd5) is integrated as an error integration circuit.
Works. The error integration signal (Sf) is supplied to the gate
Gate modulation circuit (Uw) of drive signal generation circuit (Upm)
And the gate drive signal (S
g). The gate modulation circuit (Uw) has a frequency
Receiving the frequency modulation signal (Sm) of the number modulation control circuit (Ut).
In addition, when generating the gate drive signal (Sg),
Add some modulation. FIG. 7 is a simplified circuit diagram of the gate modulation circuit (Uw).
2 shows an abbreviated configuration example. Have appropriate voltage
From a DC voltage source (Vcc) through a resistor (Rw6).
Thus, the capacitor (Cw2) is charged. Charge speed
The resistance value of the resistor (Rw6) and the capacitor
Determined by the capacitance of (Cw2)
(Cw2), that is, the charging voltage signal (Sw1)
Increases monotonically with time, for example, as shown in FIG.
You. The voltage of the DC voltage source (Vcc) is a voltage dividing resistor
(Rw7, Rw8) divided at an appropriate ratio and compared
Is input to one input terminal of the device (Cmw1). Also,
The charging voltage signal (Sw1) is supplied to the comparator (Cmw
1) is input to the other input terminal and the voltage dividing resistor (R
w7, Rw8). The voltage of the charging voltage signal (Sw1) is
When the voltage becomes higher than the voltage of the voltage dividing resistors (Rw7, Rw8),
The comparator (Cmw1) outputs a high-level signal (Sw2).
(FIG. 8b), and receiving this signal,
The bilator (Tw) has a fixed time width, high
Generate the timing pulse (Ckw) at the level
(FIG. 8c). The timing pulse (Ckw) is generated by a resistor
The transistor (Qw3) is turned on via (Rw5)
, The charge of the capacitor (Cw2) is
Because the battery is discharged, the charging voltage signal (Sw1) is substantially zero.
In this state, the timing pulse (Ck
w) is maintained at a high level. The monostable multivibrator (T
When the set time of w) elapses, the timing pulse
(Ckw) returns to the low level, and the transistor (Qw
3) is turned off, so that the aforementioned capacitor (Cw
The charging of 2) is restarted. To repeat such actions
Therefore, the charging voltage signal (Sw1) has a substantially sawtooth waveform.
(FIG. 8a). The monostable multivibrator (T
The high-level time width of w) is at least
Discharge of capacitor (Cw2) by transistor (Qw3)
As long as the width can be secured enough to ensure that
Therefore, in FIG. 7, as an example, the comparator (C
mw1) signal (Sw2) and the resistance (Rwt)
By the output of the delay circuit using the capacitor (Cwt)
The simplest method of masking with a gate (Gwt)
Although one is described, another type may be used. The error integration signal (Sf) is connected to a resistor (Rw
9) and appropriate via diodes (Dw2, Dw3)
Connected to a DC voltage source (Vcc)
As a result, the diode (Dw3) side of the resistor (Rw9)
The signal (Sf ′) taken from the terminal of
Forward direction of diodes (Dw2, Dw3) rather than (Sf)
The signal is obtained by adding an offset by the voltage. This signal (S
f ′) and the charging voltage signal (Sw1) having a substantially sawtooth waveform.
Is compared with the comparator (Cmw2). The charging voltage
The voltage of the signal (Sw1) is higher than the voltage of the signal (Sf ′).
The gate drive signal which is at a high level during a high period.
(Sg) is generated. FIG. 8a shows the signal (S
The level of f ′) is indicated by a dashed line,
In the period (τ111) in which the signal (Sw1) is high, FIG.
The gate drive signal (Sg) goes high
The situation is shown. The gate drive signal generation circuit (Upm)
The gate drive signal (Sg) output from the
Input to the drive circuit (Gx)
The lamp current signal (Si) and the lamp voltage
The signal (Sv) feeds the operation of the switch element (Qx).
The feedback control system is completed. As described above, the signal (S
f ′) is obtained by adding an offset to the error integration signal (Sf).
Therefore, the error integration signal (Sf) is temporarily zero.
Even if the gate drive signal (Sg)
The cycle ratio is a certain maximum value, less than 100%,
That is, the duty cycle ratio is equal to or less than the maximum duty cycle ratio. Add off
Regarding the set amount, the diode (Dw2, Dw3)
Zener with more or less number or appropriate zener voltage
It can be changed by replacing it with a diode.
You. The frequency modulation control circuit (Ut) modulates
This signal is used to determine the period shown in FIG.
Stepwise or continuous modulation during all periods
In this case, an astable multivibrator may be used. The output signal of the frequency modulation control circuit (Ut)
Signal is used as the frequency modulation signal (Sm).
Is sent to the adjustment circuit (Uw). The gate modulation circuit (U
w), a resistor (Rw1) and a transistor
(Qw1), the frequency modulation signal
Signal (Sm) is high level (τ112)
(Rw3, Rw4), capacitor (Cw1), DIO
(Dw1) and transistor (Qw2)
And gradually increase the charging current to the capacitor (Cw2).
You. When the frequency modulation signal (Sm) is at a low level
Period (τ113) is the resistance (Rw2, Rw4)
By a capacitor (Cw1) and a transistor (Qw2)
Slowly supply charging current to the capacitor (Cw2)
I do. The resistor (Rw) is connected to the capacitor (Cw2).
w6), charging is performed via the frequency-modulated signal
While (Sm) is at the high level, the resistance (Rw4)
Since the charging is performed while the charging current is increasing, FIG.
As shown in the period (τ112), the charging voltage signal (S
The slope of the waveform of w1) during the charging period increases,
Cycle of the gate drive signal (Sg), that is, the high level period
And low-level period are reduced, resulting in the switch
Switch element (Qx) has both on and off periods shortened
It is. Further, the frequency modulation signal (Sm) is at a low level.
During the period of, although the charging current from the resistor (Rw4) decreases,
Since charging is performed, the charging is performed during the period (τ113) in FIG.
The charging period of the waveform of the charging voltage signal (Sw1)
Between the gate drive signals (Sg)
Cycle, that is, high-level period and low-level period
Is extended, and as a result, the switching element (Qx) is turned off.
And off periods are both extended and shortened. These movements
The operation realizes frequency modulation. In addition, this state,
This corresponds to FIG. 2c. At this time, the ripple of the lamp current (IL)
Is represented by a solid line in FIG.
The wave number shifts to overcome the inconvenience caused by the acoustic resonance of the lamp.
It can be seen that the function of evading is exhibited. The gate modulation circuit (Uw) shown in FIG.
The resistors (Rw2, Rw3) and the capacitor (C
As the value of w1) decreases, the switching element (Q
Since the degree of shortening of the cycle of x) increases, these values
Can be adjusted to adjust the frequency shift amount. According to the present invention, the switch shown in FIG.
7. The chopper capacity control circuit (Ud) and the gate shown in FIG.
When configuring the modulation circuit (Uw), the operational amplifier
(Ade), comparator (Cmw2), etc.
Also, commercially available integrated circuits (eg, Texas Instruments)
TL494 manufactured by Tsutsumi Corporation and μPC494 manufactured by NEC Corporation.
Etc.) can be used. FIG. 9 shows that the integrated circuit (IC1) has T
Using L494, the chopper capacity control circuit (Ud)
And a gate drive signal generation circuit (Upm).
And the gate drive signal (S
g) shows an example of a simplified configuration for generating
It is. The resistor (Rj4) and the capacitor (Cj2)
A current mirror configuration of the integrated circuit (IC1)
Connected to the oscillating frequency determination circuit (Osc)
The value of the current flowing through the resistor (Rj4).
The oscillation frequency is determined by the speed at which the capacitor (Cj2) is charged.
You. The frequency modulation control circuit (Ut) operates.
As a result, the same frequency modulation signal (S
m) is generated. The frequency modulation signal (Sm) is high
During the level period, a diode is connected via the resistor (Rj1).
(Dj1) to the capacitor (Cj)
By the operation of the resistor (Qj1), the resistance (Rj4) is
To increase the current flowing through the resistor (Rj3) inserted in parallel
In this period, the integrated circuit (IC1)
The oscillation cycle becomes shorter, and during the period (τ112) in FIG.
Performs the same operation as that described above. The frequency modulation signal (Sm) is low.
During the bell period, the charged capacitor (Cj1)
While the resistor (Rj2) discharges, the transistor (Qj
The operation of 1) reduces the current flowing through the resistor (Rj3).
At least during this period, the integrated circuit (IC
The oscillation period of (1) becomes longer, and the period (τ11
The same operation as in 3) is performed. As a result,
Gate drive with frequency modulation similar to FIG. 8e
A signal (Sg) is generated. Of course, the present invention relates to a discharge lamp
Function after the start of discharge, especially after the start of arc discharge.
The structure of the starter (Ui)
Or a high-voltage discharge run generated by the starter (Ui).
It can be applied irrespective of the method of application to the pump. Thus, for example, the discharge space of a discharge lamp
An auxiliary electrode is provided inside or on the outer surface of
Between one of the bipolar electrodes and the auxiliary electrode,
Apply a higher voltage than the starter (DC drive or A
Also in the external trigger type light source device (of the C drive type),
The effects of the present invention are well exhibited. The circuit configuration described in the present specification is an optical circuit of the present invention.
Minimum required to explain the operation, function, and operation of the
It describes the limited one. Therefore, in the example
Details of the described circuit operation, e.g. signal polarity
Or the selection, addition, omission, or
Ingenuity such as change of the device based on the convenience of obtaining the element or economic reasons
Husband is energetically engaged in actual equipment design work.
It is assumed that In particular, damage such as overvoltage, overcurrent and overheating
Circuits such as switching elements such as FETs of the power supply device due to factors
A mechanism for protecting the element or a circuit element of the power supply device
Of radiated or conducted noise generated by the
In order to reduce the amount of noise and prevent the generated noise from being output to the outside
Mechanism such as snubber circuit, varistor, clamp die
Ade, current limit (including pulse-by-pulse method)
Road, common mode or normal mode noise fill
Tachoke coils, noise filter capacitors, etc.
If necessary, add to each part of the circuit configuration described in the embodiment.
It is assumed that The configuration of the light source device according to the present invention is described in this specification.
Limited to those of the circuit type described in Examples
Not the waveforms and timings described in the examples
It is not limited to the figures. For example, the power supply control circuit shown in FIG.
The general control unit (Xpu) of the road (Fx) includes a lamp voltage
(VL) corresponding to the lamp voltage signal (Sv)
And based on this, the chopper capacity control target signal
(St) was set, but the lamp current (IL)
The lamp current signal (Si) corresponding to
And the obtained current value matches the target current value.
Correction of the chopper capacity control target signal (St)
Setting, the variation of each circuit element parameter
High accuracy, high functionality, or
Conversely, for example, the microprocessor unit (M
pu) and replace it with a simpler control circuit.
The present invention can be applied to a variety of light source device configurations such as
The effect is excellently exhibited. According to the present invention, the light source device can be DC driven or
Avoids problems caused by acoustic resonance of AC-driven discharge lamps
can do.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a simplified example of a configuration of a light source device of the present invention of a DC drive system using a power supply device of a step-down chopper system. FIG. 2 is a diagram illustrating an example of an operation of a chopper of the power supply device of the light source device of the present invention. FIG. 3 is a diagram illustrating an example of a boost chopper. FIG. 4 is a diagram illustrating an example of a reversing chopper. FIG. 5 is a diagram showing a simplified example of a configuration of a light source device of the present invention of an AC drive system. FIG. 6 is a diagram illustrating an example of a configuration of a power supply control circuit and a gate drive signal generation circuit of the light source device of the present invention. FIG. 7 is a diagram showing an example of a configuration of a gate modulation circuit for a chopper of a power supply device of the light source device of the present invention. FIG. 8 is a diagram showing an example of the operation of the chopper of the power supply device of the light source device of the present invention. FIG. 9 is a diagram illustrating an example of a configuration of a part of a chopper capability control circuit and a gate drive signal generation circuit of the power supply device of the light source device of the present invention. [Description of Signs] Ad1 Buffer Ad2 Buffer Ad3 Buffer Adc AD Converter Ade Operational Amplifier Bx Ballast Circuit Cd1 Integration Capacitor Ci Capacitor Cj1 Capacitor Cj2 Capacitor Ckw Timing Pulse Cmv Comparator Cmw1 Comparator Cmw2 Comparator Cw1 Capacitor Cw2 Capacitor Cwt Capacitor Cxr Smoothing capacitor Cxu Smoothing capacitor Dac D / A converter Dd1 Diode Dd2 Diode Dd3 Diode Dd4 Diode Dj1 Diode Dw1 Diode Dw2 Diode Dw3 Diode Dx Flywheel diode Dxr Diode Dxu Diode E1 Electrode E2 Electrode Ex Feeder control circuit Fx Inverter control circuit Fx G1 Gate drive circuit G2 Gate drive Circuit G3 Gate drive circuit G4 Gate drive circuit Gi Gate drive circuit Gndx Ground Gs1 Signal Gs2 Signal Gwt Gate Gx Gate drive circuit Gxr Gate drive circuit Gxu Gate drive circuit Hi Secondary winding IC1 Integrated circuit IL Lamp current Ix Current detection means Ki Transformer Ld Discharge lamp Ld 'Discharge lamp Lx Choke coil Lxr Choke coil Lxu Choke coil Mpu Microprocessor unit Mx DC power supply Osc Oscillation frequency determination circuit Pi Primary winding Q1 Switch element Q2 Switch element Q3 Switch element Q4 Switch element Qd1 Transistor Qi Switch element Qj1 Transistor Qw1 Transistor Qw2 Transistor Qw3 Transistor Qx Switch element Qxr Switch element Qxu Switch element Rd1 Pull-up Anti-Rd2 Resistance Rd3 Resistance Rd4 Resistance Rd5 Pull-down resistance Rd6 Speed-up resistance Ri Resistance Rj1 Resistance Rj2 Resistance Rj3 Resistance Rj4 Resistance Rw1 Resistance Rw2 Resistance Rw3 Resistance Rw4 Resistance Rw5 Resistance Rw6 Resistance Rw7 Voltage division resistance Rw8 Voltage division resistance Rw8 Voltage division resistance Rw8 Voltage division resistance Rw8 Drive target signal Sd3 Signal Sd4 Signal Sd5 Control target signal Sd6 Signal Sd7 Signal Sf Error integration signal Sf 'Signal Sg Gate drive signal Si Lamp current signal Sk Lamp current upper limit signal Sm Frequency modulation signal St Chopper capability control target signal Su High voltage pulse generation signal Sv Lamp voltage signal Sw1 Charging voltage signal Sw2 signal Sxt Chopper capacity control * Target data Sxv Lamp voltage data T11 Terminal T12 Terminal T21 Terminal T22 Terminal Tw Monostable multivibrator b Inverter Uc Lamp current upper limit signal generation circuit Ud Chopper capability control circuit Ui Starter Ui 'Starter Uosc Oscillation block Upm Gate drive signal generation circuit Ut Frequency modulation control circuit Uw Gate modulation circuit Vcc DC voltage source Vd1 Reference voltage source Vd2 Reference voltage source Vd3 Voltage source VL Lamp voltage Vx Voltage detection means Xpu General control unit τ01 period τ012 period τ021 period τ022 period τ111 period τ112 period τ113 period

[Procedure amendment] [Submission date] December 25, 2002 (2002.12.
25) [Procedure amendment 1] [Document name to be amended] Statement [Correction target item name] Claims [Correction method] Change [Correction contents] [Claims] 1. A discharge lamp in which a pair of electrodes are opposed to each other.
Start the discharge lamp and supply a discharge current to the electrode.
Light source device connected to a power supply device (Ex) for supplying power
In place The power supply device (Ex) controls a power supply amount to the discharge lamp.
Using a switching element for adjustment,
For the substantially periodic switching operation of the switching element
On the other hand, a light source device characterized by adding frequency modulation
Place. 2. A discharge lamp is started to supply a discharge current.
Power supply device (Ex) for A switching element is used to adjust the amount of power supplied to the discharge lamp.
To be used, the approximate period of the switching element
Frequency modulation for dynamic switching operation.
A power supply device characterized by the above. [Procedure amendment 2] [Document name to be amended] Statement [Correction target item name] 0010 [Correction method] Change [Correction contents] [0010] [MEANS FOR SOLVING THE PROBLEMS] To solve this problem
The present inventionThe light source device isA pair of electrodes are arranged facing each other
Starting the discharge lamp and the discharge lamp,
Connected to power supply device (Ex) for supplying electric currentdo it
BecomeThe power supply device (Ex) supplies power to the discharge lamp.
A switching element is used to adjust the power.
The substantially periodic switching of the switching element
Applying frequency modulation to the operationFeatures.
In addition, the power supply device of the present invention starts a discharge lamp to discharge electricity.
A device for supplying current, which adjusts the amount of power supplied to the discharge lamp.
Using a switching element for adjustment,
For the substantially periodic switching operation of the switching element
On the other hand, the frequency modulation is applied.

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 3K072 AA11 AC04 AC11 AC12 AC20                       BA03 CA07 DD03 DD04 DD06                       GA02 GB03 GB18 HA04 HA06                       HA09

Claims (1)

Claims: 1. A discharge lamp having a pair of electrodes opposed to each other, and a power supply (Ex) for starting the discharge lamp and supplying a discharge current to the electrodes are connected. In the light source device, the power supply device (Ex) uses a switching element for adjusting a power supply amount to the discharge lamp, and performs frequency modulation with respect to a substantially periodic switching operation of the switching element. A light source device characterized by adding: